2 * linux/drivers/char/synclink.c
4 * $Id: synclink.c,v 4.37 2005/09/07 13:13:19 paulkf Exp $
6 * Device driver for Microgate SyncLink ISA and PCI
7 * high speed multiprotocol serial adapters.
9 * written by Paul Fulghum for Microgate Corporation
10 * paulkf@microgate.com
12 * Microgate and SyncLink are trademarks of Microgate Corporation
14 * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
16 * Original release 01/11/99
18 * This code is released under the GNU General Public License (GPL)
20 * This driver is primarily intended for use in synchronous
21 * HDLC mode. Asynchronous mode is also provided.
23 * When operating in synchronous mode, each call to mgsl_write()
24 * contains exactly one complete HDLC frame. Calling mgsl_put_char
25 * will start assembling an HDLC frame that will not be sent until
26 * mgsl_flush_chars or mgsl_write is called.
28 * Synchronous receive data is reported as complete frames. To accomplish
29 * this, the TTY flip buffer is bypassed (too small to hold largest
30 * frame and may fragment frames) and the line discipline
31 * receive entry point is called directly.
33 * This driver has been tested with a slightly modified ppp.c driver
34 * for synchronous PPP.
37 * Added interface for syncppp.c driver (an alternate synchronous PPP
38 * implementation that also supports Cisco HDLC). Each device instance
39 * registers as a tty device AND a network device (if dosyncppp option
40 * is set for the device). The functionality is determined by which
41 * device interface is opened.
43 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
44 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
45 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
46 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
47 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
48 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
49 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
51 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
52 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
53 * OF THE POSSIBILITY OF SUCH DAMAGE.
57 # define BREAKPOINT() asm(" int $3");
59 # define BREAKPOINT() { }
62 #define MAX_ISA_DEVICES 10
63 #define MAX_PCI_DEVICES 10
64 #define MAX_TOTAL_DEVICES 20
66 #include <linux/config.h>
67 #include <linux/module.h>
68 #include <linux/errno.h>
69 #include <linux/signal.h>
70 #include <linux/sched.h>
71 #include <linux/timer.h>
72 #include <linux/interrupt.h>
73 #include <linux/pci.h>
74 #include <linux/tty.h>
75 #include <linux/tty_flip.h>
76 #include <linux/serial.h>
77 #include <linux/major.h>
78 #include <linux/string.h>
79 #include <linux/fcntl.h>
80 #include <linux/ptrace.h>
81 #include <linux/ioport.h>
83 #include <linux/slab.h>
84 #include <linux/delay.h>
86 #include <linux/netdevice.h>
88 #include <linux/vmalloc.h>
89 #include <linux/init.h>
90 #include <asm/serial.h>
92 #include <linux/delay.h>
93 #include <linux/ioctl.h>
95 #include <asm/system.h>
99 #include <linux/bitops.h>
100 #include <asm/types.h>
101 #include <linux/termios.h>
102 #include <linux/workqueue.h>
103 #include <linux/hdlc.h>
105 #ifdef CONFIG_HDLC_MODULE
106 #define CONFIG_HDLC 1
109 #define GET_USER(error,value,addr) error = get_user(value,addr)
110 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
111 #define PUT_USER(error,value,addr) error = put_user(value,addr)
112 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
114 #include <asm/uaccess.h>
116 #include "linux/synclink.h"
118 #define RCLRVALUE 0xffff
120 static MGSL_PARAMS default_params = {
121 MGSL_MODE_HDLC, /* unsigned long mode */
122 0, /* unsigned char loopback; */
123 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
124 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
125 0, /* unsigned long clock_speed; */
126 0xff, /* unsigned char addr_filter; */
127 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
128 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
129 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
130 9600, /* unsigned long data_rate; */
131 8, /* unsigned char data_bits; */
132 1, /* unsigned char stop_bits; */
133 ASYNC_PARITY_NONE /* unsigned char parity; */
136 #define SHARED_MEM_ADDRESS_SIZE 0x40000
137 #define BUFFERLISTSIZE (PAGE_SIZE)
138 #define DMABUFFERSIZE (PAGE_SIZE)
139 #define MAXRXFRAMES 7
141 typedef struct _DMABUFFERENTRY
143 u32 phys_addr; /* 32-bit flat physical address of data buffer */
144 volatile u16 count; /* buffer size/data count */
145 volatile u16 status; /* Control/status field */
146 volatile u16 rcc; /* character count field */
147 u16 reserved; /* padding required by 16C32 */
148 u32 link; /* 32-bit flat link to next buffer entry */
149 char *virt_addr; /* virtual address of data buffer */
150 u32 phys_entry; /* physical address of this buffer entry */
151 } DMABUFFERENTRY, *DMAPBUFFERENTRY;
153 /* The queue of BH actions to be performed */
156 #define BH_TRANSMIT 2
159 #define IO_PIN_SHUTDOWN_LIMIT 100
161 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
163 struct _input_signal_events {
174 /* transmit holding buffer definitions*/
175 #define MAX_TX_HOLDING_BUFFERS 5
176 struct tx_holding_buffer {
178 unsigned char * buffer;
183 * Device instance data structure
189 int count; /* count of opens */
192 unsigned short close_delay;
193 unsigned short closing_wait; /* time to wait before closing */
195 struct mgsl_icount icount;
197 struct tty_struct *tty;
199 int x_char; /* xon/xoff character */
200 int blocked_open; /* # of blocked opens */
201 u16 read_status_mask;
202 u16 ignore_status_mask;
203 unsigned char *xmit_buf;
208 wait_queue_head_t open_wait;
209 wait_queue_head_t close_wait;
211 wait_queue_head_t status_event_wait_q;
212 wait_queue_head_t event_wait_q;
213 struct timer_list tx_timer; /* HDLC transmit timeout timer */
214 struct mgsl_struct *next_device; /* device list link */
216 spinlock_t irq_spinlock; /* spinlock for synchronizing with ISR */
217 struct work_struct task; /* task structure for scheduling bh */
219 u32 EventMask; /* event trigger mask */
220 u32 RecordedEvents; /* pending events */
222 u32 max_frame_size; /* as set by device config */
226 int bh_running; /* Protection from multiple */
230 int dcd_chkcount; /* check counts to prevent */
231 int cts_chkcount; /* too many IRQs if a signal */
232 int dsr_chkcount; /* is floating */
235 char *buffer_list; /* virtual address of Rx & Tx buffer lists */
236 unsigned long buffer_list_phys;
238 unsigned int rx_buffer_count; /* count of total allocated Rx buffers */
239 DMABUFFERENTRY *rx_buffer_list; /* list of receive buffer entries */
240 unsigned int current_rx_buffer;
242 int num_tx_dma_buffers; /* number of tx dma frames required */
243 int tx_dma_buffers_used;
244 unsigned int tx_buffer_count; /* count of total allocated Tx buffers */
245 DMABUFFERENTRY *tx_buffer_list; /* list of transmit buffer entries */
246 int start_tx_dma_buffer; /* tx dma buffer to start tx dma operation */
247 int current_tx_buffer; /* next tx dma buffer to be loaded */
249 unsigned char *intermediate_rxbuffer;
251 int num_tx_holding_buffers; /* number of tx holding buffer allocated */
252 int get_tx_holding_index; /* next tx holding buffer for adapter to load */
253 int put_tx_holding_index; /* next tx holding buffer to store user request */
254 int tx_holding_count; /* number of tx holding buffers waiting */
255 struct tx_holding_buffer tx_holding_buffers[MAX_TX_HOLDING_BUFFERS];
268 char device_name[25]; /* device instance name */
270 unsigned int bus_type; /* expansion bus type (ISA,EISA,PCI) */
271 unsigned char bus; /* expansion bus number (zero based) */
272 unsigned char function; /* PCI device number */
274 unsigned int io_base; /* base I/O address of adapter */
275 unsigned int io_addr_size; /* size of the I/O address range */
276 int io_addr_requested; /* nonzero if I/O address requested */
278 unsigned int irq_level; /* interrupt level */
279 unsigned long irq_flags;
280 int irq_requested; /* nonzero if IRQ requested */
282 unsigned int dma_level; /* DMA channel */
283 int dma_requested; /* nonzero if dma channel requested */
289 MGSL_PARAMS params; /* communications parameters */
291 unsigned char serial_signals; /* current serial signal states */
293 int irq_occurred; /* for diagnostics use */
294 unsigned int init_error; /* Initialization startup error (DIAGS) */
295 int fDiagnosticsmode; /* Driver in Diagnostic mode? (DIAGS) */
298 unsigned char* memory_base; /* shared memory address (PCI only) */
299 u32 phys_memory_base;
300 int shared_mem_requested;
302 unsigned char* lcr_base; /* local config registers (PCI only) */
305 int lcr_mem_requested;
308 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
309 char char_buf[MAX_ASYNC_BUFFER_SIZE];
310 BOOLEAN drop_rts_on_tx_done;
312 BOOLEAN loopmode_insert_requested;
313 BOOLEAN loopmode_send_done_requested;
315 struct _input_signal_events input_signal_events;
317 /* generic HDLC device parts */
323 struct net_device *netdev;
327 #define MGSL_MAGIC 0x5401
330 * The size of the serial xmit buffer is 1 page, or 4096 bytes
332 #ifndef SERIAL_XMIT_SIZE
333 #define SERIAL_XMIT_SIZE 4096
337 * These macros define the offsets used in calculating the
338 * I/O address of the specified USC registers.
342 #define DCPIN 2 /* Bit 1 of I/O address */
343 #define SDPIN 4 /* Bit 2 of I/O address */
345 #define DCAR 0 /* DMA command/address register */
346 #define CCAR SDPIN /* channel command/address register */
347 #define DATAREG DCPIN + SDPIN /* serial data register */
352 * These macros define the register address (ordinal number)
353 * used for writing address/value pairs to the USC.
356 #define CMR 0x02 /* Channel mode Register */
357 #define CCSR 0x04 /* Channel Command/status Register */
358 #define CCR 0x06 /* Channel Control Register */
359 #define PSR 0x08 /* Port status Register */
360 #define PCR 0x0a /* Port Control Register */
361 #define TMDR 0x0c /* Test mode Data Register */
362 #define TMCR 0x0e /* Test mode Control Register */
363 #define CMCR 0x10 /* Clock mode Control Register */
364 #define HCR 0x12 /* Hardware Configuration Register */
365 #define IVR 0x14 /* Interrupt Vector Register */
366 #define IOCR 0x16 /* Input/Output Control Register */
367 #define ICR 0x18 /* Interrupt Control Register */
368 #define DCCR 0x1a /* Daisy Chain Control Register */
369 #define MISR 0x1c /* Misc Interrupt status Register */
370 #define SICR 0x1e /* status Interrupt Control Register */
371 #define RDR 0x20 /* Receive Data Register */
372 #define RMR 0x22 /* Receive mode Register */
373 #define RCSR 0x24 /* Receive Command/status Register */
374 #define RICR 0x26 /* Receive Interrupt Control Register */
375 #define RSR 0x28 /* Receive Sync Register */
376 #define RCLR 0x2a /* Receive count Limit Register */
377 #define RCCR 0x2c /* Receive Character count Register */
378 #define TC0R 0x2e /* Time Constant 0 Register */
379 #define TDR 0x30 /* Transmit Data Register */
380 #define TMR 0x32 /* Transmit mode Register */
381 #define TCSR 0x34 /* Transmit Command/status Register */
382 #define TICR 0x36 /* Transmit Interrupt Control Register */
383 #define TSR 0x38 /* Transmit Sync Register */
384 #define TCLR 0x3a /* Transmit count Limit Register */
385 #define TCCR 0x3c /* Transmit Character count Register */
386 #define TC1R 0x3e /* Time Constant 1 Register */
390 * MACRO DEFINITIONS FOR DMA REGISTERS
393 #define DCR 0x06 /* DMA Control Register (shared) */
394 #define DACR 0x08 /* DMA Array count Register (shared) */
395 #define BDCR 0x12 /* Burst/Dwell Control Register (shared) */
396 #define DIVR 0x14 /* DMA Interrupt Vector Register (shared) */
397 #define DICR 0x18 /* DMA Interrupt Control Register (shared) */
398 #define CDIR 0x1a /* Clear DMA Interrupt Register (shared) */
399 #define SDIR 0x1c /* Set DMA Interrupt Register (shared) */
401 #define TDMR 0x02 /* Transmit DMA mode Register */
402 #define TDIAR 0x1e /* Transmit DMA Interrupt Arm Register */
403 #define TBCR 0x2a /* Transmit Byte count Register */
404 #define TARL 0x2c /* Transmit Address Register (low) */
405 #define TARU 0x2e /* Transmit Address Register (high) */
406 #define NTBCR 0x3a /* Next Transmit Byte count Register */
407 #define NTARL 0x3c /* Next Transmit Address Register (low) */
408 #define NTARU 0x3e /* Next Transmit Address Register (high) */
410 #define RDMR 0x82 /* Receive DMA mode Register (non-shared) */
411 #define RDIAR 0x9e /* Receive DMA Interrupt Arm Register */
412 #define RBCR 0xaa /* Receive Byte count Register */
413 #define RARL 0xac /* Receive Address Register (low) */
414 #define RARU 0xae /* Receive Address Register (high) */
415 #define NRBCR 0xba /* Next Receive Byte count Register */
416 #define NRARL 0xbc /* Next Receive Address Register (low) */
417 #define NRARU 0xbe /* Next Receive Address Register (high) */
421 * MACRO DEFINITIONS FOR MODEM STATUS BITS
424 #define MODEMSTATUS_DTR 0x80
425 #define MODEMSTATUS_DSR 0x40
426 #define MODEMSTATUS_RTS 0x20
427 #define MODEMSTATUS_CTS 0x10
428 #define MODEMSTATUS_RI 0x04
429 #define MODEMSTATUS_DCD 0x01
433 * Channel Command/Address Register (CCAR) Command Codes
436 #define RTCmd_Null 0x0000
437 #define RTCmd_ResetHighestIus 0x1000
438 #define RTCmd_TriggerChannelLoadDma 0x2000
439 #define RTCmd_TriggerRxDma 0x2800
440 #define RTCmd_TriggerTxDma 0x3000
441 #define RTCmd_TriggerRxAndTxDma 0x3800
442 #define RTCmd_PurgeRxFifo 0x4800
443 #define RTCmd_PurgeTxFifo 0x5000
444 #define RTCmd_PurgeRxAndTxFifo 0x5800
445 #define RTCmd_LoadRcc 0x6800
446 #define RTCmd_LoadTcc 0x7000
447 #define RTCmd_LoadRccAndTcc 0x7800
448 #define RTCmd_LoadTC0 0x8800
449 #define RTCmd_LoadTC1 0x9000
450 #define RTCmd_LoadTC0AndTC1 0x9800
451 #define RTCmd_SerialDataLSBFirst 0xa000
452 #define RTCmd_SerialDataMSBFirst 0xa800
453 #define RTCmd_SelectBigEndian 0xb000
454 #define RTCmd_SelectLittleEndian 0xb800
458 * DMA Command/Address Register (DCAR) Command Codes
461 #define DmaCmd_Null 0x0000
462 #define DmaCmd_ResetTxChannel 0x1000
463 #define DmaCmd_ResetRxChannel 0x1200
464 #define DmaCmd_StartTxChannel 0x2000
465 #define DmaCmd_StartRxChannel 0x2200
466 #define DmaCmd_ContinueTxChannel 0x3000
467 #define DmaCmd_ContinueRxChannel 0x3200
468 #define DmaCmd_PauseTxChannel 0x4000
469 #define DmaCmd_PauseRxChannel 0x4200
470 #define DmaCmd_AbortTxChannel 0x5000
471 #define DmaCmd_AbortRxChannel 0x5200
472 #define DmaCmd_InitTxChannel 0x7000
473 #define DmaCmd_InitRxChannel 0x7200
474 #define DmaCmd_ResetHighestDmaIus 0x8000
475 #define DmaCmd_ResetAllChannels 0x9000
476 #define DmaCmd_StartAllChannels 0xa000
477 #define DmaCmd_ContinueAllChannels 0xb000
478 #define DmaCmd_PauseAllChannels 0xc000
479 #define DmaCmd_AbortAllChannels 0xd000
480 #define DmaCmd_InitAllChannels 0xf000
482 #define TCmd_Null 0x0000
483 #define TCmd_ClearTxCRC 0x2000
484 #define TCmd_SelectTicrTtsaData 0x4000
485 #define TCmd_SelectTicrTxFifostatus 0x5000
486 #define TCmd_SelectTicrIntLevel 0x6000
487 #define TCmd_SelectTicrdma_level 0x7000
488 #define TCmd_SendFrame 0x8000
489 #define TCmd_SendAbort 0x9000
490 #define TCmd_EnableDleInsertion 0xc000
491 #define TCmd_DisableDleInsertion 0xd000
492 #define TCmd_ClearEofEom 0xe000
493 #define TCmd_SetEofEom 0xf000
495 #define RCmd_Null 0x0000
496 #define RCmd_ClearRxCRC 0x2000
497 #define RCmd_EnterHuntmode 0x3000
498 #define RCmd_SelectRicrRtsaData 0x4000
499 #define RCmd_SelectRicrRxFifostatus 0x5000
500 #define RCmd_SelectRicrIntLevel 0x6000
501 #define RCmd_SelectRicrdma_level 0x7000
504 * Bits for enabling and disabling IRQs in Interrupt Control Register (ICR)
507 #define RECEIVE_STATUS BIT5
508 #define RECEIVE_DATA BIT4
509 #define TRANSMIT_STATUS BIT3
510 #define TRANSMIT_DATA BIT2
516 * Receive status Bits in Receive Command/status Register RCSR
519 #define RXSTATUS_SHORT_FRAME BIT8
520 #define RXSTATUS_CODE_VIOLATION BIT8
521 #define RXSTATUS_EXITED_HUNT BIT7
522 #define RXSTATUS_IDLE_RECEIVED BIT6
523 #define RXSTATUS_BREAK_RECEIVED BIT5
524 #define RXSTATUS_ABORT_RECEIVED BIT5
525 #define RXSTATUS_RXBOUND BIT4
526 #define RXSTATUS_CRC_ERROR BIT3
527 #define RXSTATUS_FRAMING_ERROR BIT3
528 #define RXSTATUS_ABORT BIT2
529 #define RXSTATUS_PARITY_ERROR BIT2
530 #define RXSTATUS_OVERRUN BIT1
531 #define RXSTATUS_DATA_AVAILABLE BIT0
532 #define RXSTATUS_ALL 0x01f6
533 #define usc_UnlatchRxstatusBits(a,b) usc_OutReg( (a), RCSR, (u16)((b) & RXSTATUS_ALL) )
536 * Values for setting transmit idle mode in
537 * Transmit Control/status Register (TCSR)
539 #define IDLEMODE_FLAGS 0x0000
540 #define IDLEMODE_ALT_ONE_ZERO 0x0100
541 #define IDLEMODE_ZERO 0x0200
542 #define IDLEMODE_ONE 0x0300
543 #define IDLEMODE_ALT_MARK_SPACE 0x0500
544 #define IDLEMODE_SPACE 0x0600
545 #define IDLEMODE_MARK 0x0700
546 #define IDLEMODE_MASK 0x0700
549 * IUSC revision identifiers
551 #define IUSC_SL1660 0x4d44
552 #define IUSC_PRE_SL1660 0x4553
555 * Transmit status Bits in Transmit Command/status Register (TCSR)
558 #define TCSR_PRESERVE 0x0F00
560 #define TCSR_UNDERWAIT BIT11
561 #define TXSTATUS_PREAMBLE_SENT BIT7
562 #define TXSTATUS_IDLE_SENT BIT6
563 #define TXSTATUS_ABORT_SENT BIT5
564 #define TXSTATUS_EOF_SENT BIT4
565 #define TXSTATUS_EOM_SENT BIT4
566 #define TXSTATUS_CRC_SENT BIT3
567 #define TXSTATUS_ALL_SENT BIT2
568 #define TXSTATUS_UNDERRUN BIT1
569 #define TXSTATUS_FIFO_EMPTY BIT0
570 #define TXSTATUS_ALL 0x00fa
571 #define usc_UnlatchTxstatusBits(a,b) usc_OutReg( (a), TCSR, (u16)((a)->tcsr_value + ((b) & 0x00FF)) )
574 #define MISCSTATUS_RXC_LATCHED BIT15
575 #define MISCSTATUS_RXC BIT14
576 #define MISCSTATUS_TXC_LATCHED BIT13
577 #define MISCSTATUS_TXC BIT12
578 #define MISCSTATUS_RI_LATCHED BIT11
579 #define MISCSTATUS_RI BIT10
580 #define MISCSTATUS_DSR_LATCHED BIT9
581 #define MISCSTATUS_DSR BIT8
582 #define MISCSTATUS_DCD_LATCHED BIT7
583 #define MISCSTATUS_DCD BIT6
584 #define MISCSTATUS_CTS_LATCHED BIT5
585 #define MISCSTATUS_CTS BIT4
586 #define MISCSTATUS_RCC_UNDERRUN BIT3
587 #define MISCSTATUS_DPLL_NO_SYNC BIT2
588 #define MISCSTATUS_BRG1_ZERO BIT1
589 #define MISCSTATUS_BRG0_ZERO BIT0
591 #define usc_UnlatchIostatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0xaaa0))
592 #define usc_UnlatchMiscstatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0x000f))
594 #define SICR_RXC_ACTIVE BIT15
595 #define SICR_RXC_INACTIVE BIT14
596 #define SICR_RXC (BIT15+BIT14)
597 #define SICR_TXC_ACTIVE BIT13
598 #define SICR_TXC_INACTIVE BIT12
599 #define SICR_TXC (BIT13+BIT12)
600 #define SICR_RI_ACTIVE BIT11
601 #define SICR_RI_INACTIVE BIT10
602 #define SICR_RI (BIT11+BIT10)
603 #define SICR_DSR_ACTIVE BIT9
604 #define SICR_DSR_INACTIVE BIT8
605 #define SICR_DSR (BIT9+BIT8)
606 #define SICR_DCD_ACTIVE BIT7
607 #define SICR_DCD_INACTIVE BIT6
608 #define SICR_DCD (BIT7+BIT6)
609 #define SICR_CTS_ACTIVE BIT5
610 #define SICR_CTS_INACTIVE BIT4
611 #define SICR_CTS (BIT5+BIT4)
612 #define SICR_RCC_UNDERFLOW BIT3
613 #define SICR_DPLL_NO_SYNC BIT2
614 #define SICR_BRG1_ZERO BIT1
615 #define SICR_BRG0_ZERO BIT0
617 void usc_DisableMasterIrqBit( struct mgsl_struct *info );
618 void usc_EnableMasterIrqBit( struct mgsl_struct *info );
619 void usc_EnableInterrupts( struct mgsl_struct *info, u16 IrqMask );
620 void usc_DisableInterrupts( struct mgsl_struct *info, u16 IrqMask );
621 void usc_ClearIrqPendingBits( struct mgsl_struct *info, u16 IrqMask );
623 #define usc_EnableInterrupts( a, b ) \
624 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0xc0 + (b)) )
626 #define usc_DisableInterrupts( a, b ) \
627 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0x80 + (b)) )
629 #define usc_EnableMasterIrqBit(a) \
630 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0x0f00) + 0xb000) )
632 #define usc_DisableMasterIrqBit(a) \
633 usc_OutReg( (a), ICR, (u16)(usc_InReg((a),ICR) & 0x7f00) )
635 #define usc_ClearIrqPendingBits( a, b ) usc_OutReg( (a), DCCR, 0x40 + (b) )
638 * Transmit status Bits in Transmit Control status Register (TCSR)
639 * and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0)
642 #define TXSTATUS_PREAMBLE_SENT BIT7
643 #define TXSTATUS_IDLE_SENT BIT6
644 #define TXSTATUS_ABORT_SENT BIT5
645 #define TXSTATUS_EOF BIT4
646 #define TXSTATUS_CRC_SENT BIT3
647 #define TXSTATUS_ALL_SENT BIT2
648 #define TXSTATUS_UNDERRUN BIT1
649 #define TXSTATUS_FIFO_EMPTY BIT0
651 #define DICR_MASTER BIT15
652 #define DICR_TRANSMIT BIT0
653 #define DICR_RECEIVE BIT1
655 #define usc_EnableDmaInterrupts(a,b) \
656 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) | (b)) )
658 #define usc_DisableDmaInterrupts(a,b) \
659 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) & ~(b)) )
661 #define usc_EnableStatusIrqs(a,b) \
662 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) | (b)) )
664 #define usc_DisablestatusIrqs(a,b) \
665 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) & ~(b)) )
667 /* Transmit status Bits in Transmit Control status Register (TCSR) */
668 /* and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0) */
671 #define DISABLE_UNCONDITIONAL 0
672 #define DISABLE_END_OF_FRAME 1
673 #define ENABLE_UNCONDITIONAL 2
674 #define ENABLE_AUTO_CTS 3
675 #define ENABLE_AUTO_DCD 3
676 #define usc_EnableTransmitter(a,b) \
677 usc_OutReg( (a), TMR, (u16)((usc_InReg((a),TMR) & 0xfffc) | (b)) )
678 #define usc_EnableReceiver(a,b) \
679 usc_OutReg( (a), RMR, (u16)((usc_InReg((a),RMR) & 0xfffc) | (b)) )
681 static u16 usc_InDmaReg( struct mgsl_struct *info, u16 Port );
682 static void usc_OutDmaReg( struct mgsl_struct *info, u16 Port, u16 Value );
683 static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd );
685 static u16 usc_InReg( struct mgsl_struct *info, u16 Port );
686 static void usc_OutReg( struct mgsl_struct *info, u16 Port, u16 Value );
687 static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd );
688 void usc_RCmd( struct mgsl_struct *info, u16 Cmd );
689 void usc_TCmd( struct mgsl_struct *info, u16 Cmd );
691 #define usc_TCmd(a,b) usc_OutReg((a), TCSR, (u16)((a)->tcsr_value + (b)))
692 #define usc_RCmd(a,b) usc_OutReg((a), RCSR, (b))
694 #define usc_SetTransmitSyncChars(a,s0,s1) usc_OutReg((a), TSR, (u16)(((u16)s0<<8)|(u16)s1))
696 static void usc_process_rxoverrun_sync( struct mgsl_struct *info );
697 static void usc_start_receiver( struct mgsl_struct *info );
698 static void usc_stop_receiver( struct mgsl_struct *info );
700 static void usc_start_transmitter( struct mgsl_struct *info );
701 static void usc_stop_transmitter( struct mgsl_struct *info );
702 static void usc_set_txidle( struct mgsl_struct *info );
703 static void usc_load_txfifo( struct mgsl_struct *info );
705 static void usc_enable_aux_clock( struct mgsl_struct *info, u32 DataRate );
706 static void usc_enable_loopback( struct mgsl_struct *info, int enable );
708 static void usc_get_serial_signals( struct mgsl_struct *info );
709 static void usc_set_serial_signals( struct mgsl_struct *info );
711 static void usc_reset( struct mgsl_struct *info );
713 static void usc_set_sync_mode( struct mgsl_struct *info );
714 static void usc_set_sdlc_mode( struct mgsl_struct *info );
715 static void usc_set_async_mode( struct mgsl_struct *info );
716 static void usc_enable_async_clock( struct mgsl_struct *info, u32 DataRate );
718 static void usc_loopback_frame( struct mgsl_struct *info );
720 static void mgsl_tx_timeout(unsigned long context);
723 static void usc_loopmode_cancel_transmit( struct mgsl_struct * info );
724 static void usc_loopmode_insert_request( struct mgsl_struct * info );
725 static int usc_loopmode_active( struct mgsl_struct * info);
726 static void usc_loopmode_send_done( struct mgsl_struct * info );
728 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg);
731 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
732 static void hdlcdev_tx_done(struct mgsl_struct *info);
733 static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size);
734 static int hdlcdev_init(struct mgsl_struct *info);
735 static void hdlcdev_exit(struct mgsl_struct *info);
739 * Defines a BUS descriptor value for the PCI adapter
740 * local bus address ranges.
743 #define BUS_DESCRIPTOR( WrHold, WrDly, RdDly, Nwdd, Nwad, Nxda, Nrdd, Nrad ) \
754 static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit);
757 * Adapter diagnostic routines
759 static BOOLEAN mgsl_register_test( struct mgsl_struct *info );
760 static BOOLEAN mgsl_irq_test( struct mgsl_struct *info );
761 static BOOLEAN mgsl_dma_test( struct mgsl_struct *info );
762 static BOOLEAN mgsl_memory_test( struct mgsl_struct *info );
763 static int mgsl_adapter_test( struct mgsl_struct *info );
766 * device and resource management routines
768 static int mgsl_claim_resources(struct mgsl_struct *info);
769 static void mgsl_release_resources(struct mgsl_struct *info);
770 static void mgsl_add_device(struct mgsl_struct *info);
771 static struct mgsl_struct* mgsl_allocate_device(void);
774 * DMA buffer manupulation functions.
776 static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex );
777 static int mgsl_get_rx_frame( struct mgsl_struct *info );
778 static int mgsl_get_raw_rx_frame( struct mgsl_struct *info );
779 static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info );
780 static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info );
781 static int num_free_tx_dma_buffers(struct mgsl_struct *info);
782 static void mgsl_load_tx_dma_buffer( struct mgsl_struct *info, const char *Buffer, unsigned int BufferSize);
783 static void mgsl_load_pci_memory(char* TargetPtr, const char* SourcePtr, unsigned short count);
786 * DMA and Shared Memory buffer allocation and formatting
788 static int mgsl_allocate_dma_buffers(struct mgsl_struct *info);
789 static void mgsl_free_dma_buffers(struct mgsl_struct *info);
790 static int mgsl_alloc_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
791 static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
792 static int mgsl_alloc_buffer_list_memory(struct mgsl_struct *info);
793 static void mgsl_free_buffer_list_memory(struct mgsl_struct *info);
794 static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info);
795 static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info);
796 static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info);
797 static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info);
798 static int load_next_tx_holding_buffer(struct mgsl_struct *info);
799 static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize);
802 * Bottom half interrupt handlers
804 static void mgsl_bh_handler(void* Context);
805 static void mgsl_bh_receive(struct mgsl_struct *info);
806 static void mgsl_bh_transmit(struct mgsl_struct *info);
807 static void mgsl_bh_status(struct mgsl_struct *info);
810 * Interrupt handler routines and dispatch table.
812 static void mgsl_isr_null( struct mgsl_struct *info );
813 static void mgsl_isr_transmit_data( struct mgsl_struct *info );
814 static void mgsl_isr_receive_data( struct mgsl_struct *info );
815 static void mgsl_isr_receive_status( struct mgsl_struct *info );
816 static void mgsl_isr_transmit_status( struct mgsl_struct *info );
817 static void mgsl_isr_io_pin( struct mgsl_struct *info );
818 static void mgsl_isr_misc( struct mgsl_struct *info );
819 static void mgsl_isr_receive_dma( struct mgsl_struct *info );
820 static void mgsl_isr_transmit_dma( struct mgsl_struct *info );
822 typedef void (*isr_dispatch_func)(struct mgsl_struct *);
824 static isr_dispatch_func UscIsrTable[7] =
829 mgsl_isr_transmit_data,
830 mgsl_isr_transmit_status,
831 mgsl_isr_receive_data,
832 mgsl_isr_receive_status
836 * ioctl call handlers
838 static int tiocmget(struct tty_struct *tty, struct file *file);
839 static int tiocmset(struct tty_struct *tty, struct file *file,
840 unsigned int set, unsigned int clear);
841 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount
842 __user *user_icount);
843 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params);
844 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params);
845 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode);
846 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode);
847 static int mgsl_txenable(struct mgsl_struct * info, int enable);
848 static int mgsl_txabort(struct mgsl_struct * info);
849 static int mgsl_rxenable(struct mgsl_struct * info, int enable);
850 static int mgsl_wait_event(struct mgsl_struct * info, int __user *mask);
851 static int mgsl_loopmode_send_done( struct mgsl_struct * info );
853 /* set non-zero on successful registration with PCI subsystem */
854 static int pci_registered;
857 * Global linked list of SyncLink devices
859 static struct mgsl_struct *mgsl_device_list;
860 static int mgsl_device_count;
863 * Set this param to non-zero to load eax with the
864 * .text section address and breakpoint on module load.
865 * This is useful for use with gdb and add-symbol-file command.
867 static int break_on_load;
870 * Driver major number, defaults to zero to get auto
871 * assigned major number. May be forced as module parameter.
876 * Array of user specified options for ISA adapters.
878 static int io[MAX_ISA_DEVICES];
879 static int irq[MAX_ISA_DEVICES];
880 static int dma[MAX_ISA_DEVICES];
881 static int debug_level;
882 static int maxframe[MAX_TOTAL_DEVICES];
883 static int dosyncppp[MAX_TOTAL_DEVICES];
884 static int txdmabufs[MAX_TOTAL_DEVICES];
885 static int txholdbufs[MAX_TOTAL_DEVICES];
887 module_param(break_on_load, bool, 0);
888 module_param(ttymajor, int, 0);
889 module_param_array(io, int, NULL, 0);
890 module_param_array(irq, int, NULL, 0);
891 module_param_array(dma, int, NULL, 0);
892 module_param(debug_level, int, 0);
893 module_param_array(maxframe, int, NULL, 0);
894 module_param_array(dosyncppp, int, NULL, 0);
895 module_param_array(txdmabufs, int, NULL, 0);
896 module_param_array(txholdbufs, int, NULL, 0);
898 static char *driver_name = "SyncLink serial driver";
899 static char *driver_version = "$Revision: 4.37 $";
901 static int synclink_init_one (struct pci_dev *dev,
902 const struct pci_device_id *ent);
903 static void synclink_remove_one (struct pci_dev *dev);
905 static struct pci_device_id synclink_pci_tbl[] = {
906 { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_USC, PCI_ANY_ID, PCI_ANY_ID, },
907 { PCI_VENDOR_ID_MICROGATE, 0x0210, PCI_ANY_ID, PCI_ANY_ID, },
908 { 0, }, /* terminate list */
910 MODULE_DEVICE_TABLE(pci, synclink_pci_tbl);
912 MODULE_LICENSE("GPL");
914 static struct pci_driver synclink_pci_driver = {
915 .owner = THIS_MODULE,
917 .id_table = synclink_pci_tbl,
918 .probe = synclink_init_one,
919 .remove = __devexit_p(synclink_remove_one),
922 static struct tty_driver *serial_driver;
924 /* number of characters left in xmit buffer before we ask for more */
925 #define WAKEUP_CHARS 256
928 static void mgsl_change_params(struct mgsl_struct *info);
929 static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout);
932 * 1st function defined in .text section. Calling this function in
933 * init_module() followed by a breakpoint allows a remote debugger
934 * (gdb) to get the .text address for the add-symbol-file command.
935 * This allows remote debugging of dynamically loadable modules.
937 static void* mgsl_get_text_ptr(void)
939 return mgsl_get_text_ptr;
943 * tmp_buf is used as a temporary buffer by mgsl_write. We need to
944 * lock it in case the COPY_FROM_USER blocks while swapping in a page,
945 * and some other program tries to do a serial write at the same time.
946 * Since the lock will only come under contention when the system is
947 * swapping and available memory is low, it makes sense to share one
948 * buffer across all the serial ioports, since it significantly saves
949 * memory if large numbers of serial ports are open.
951 static unsigned char *tmp_buf;
952 static DECLARE_MUTEX(tmp_buf_sem);
954 static inline int mgsl_paranoia_check(struct mgsl_struct *info,
955 char *name, const char *routine)
957 #ifdef MGSL_PARANOIA_CHECK
958 static const char *badmagic =
959 "Warning: bad magic number for mgsl struct (%s) in %s\n";
960 static const char *badinfo =
961 "Warning: null mgsl_struct for (%s) in %s\n";
964 printk(badinfo, name, routine);
967 if (info->magic != MGSL_MAGIC) {
968 printk(badmagic, name, routine);
979 * line discipline callback wrappers
981 * The wrappers maintain line discipline references
982 * while calling into the line discipline.
984 * ldisc_receive_buf - pass receive data to line discipline
987 static void ldisc_receive_buf(struct tty_struct *tty,
988 const __u8 *data, char *flags, int count)
990 struct tty_ldisc *ld;
993 ld = tty_ldisc_ref(tty);
996 ld->receive_buf(tty, data, flags, count);
1001 /* mgsl_stop() throttle (stop) transmitter
1003 * Arguments: tty pointer to tty info structure
1004 * Return Value: None
1006 static void mgsl_stop(struct tty_struct *tty)
1008 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
1009 unsigned long flags;
1011 if (mgsl_paranoia_check(info, tty->name, "mgsl_stop"))
1014 if ( debug_level >= DEBUG_LEVEL_INFO )
1015 printk("mgsl_stop(%s)\n",info->device_name);
1017 spin_lock_irqsave(&info->irq_spinlock,flags);
1018 if (info->tx_enabled)
1019 usc_stop_transmitter(info);
1020 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1022 } /* end of mgsl_stop() */
1024 /* mgsl_start() release (start) transmitter
1026 * Arguments: tty pointer to tty info structure
1027 * Return Value: None
1029 static void mgsl_start(struct tty_struct *tty)
1031 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
1032 unsigned long flags;
1034 if (mgsl_paranoia_check(info, tty->name, "mgsl_start"))
1037 if ( debug_level >= DEBUG_LEVEL_INFO )
1038 printk("mgsl_start(%s)\n",info->device_name);
1040 spin_lock_irqsave(&info->irq_spinlock,flags);
1041 if (!info->tx_enabled)
1042 usc_start_transmitter(info);
1043 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1045 } /* end of mgsl_start() */
1048 * Bottom half work queue access functions
1051 /* mgsl_bh_action() Return next bottom half action to perform.
1052 * Return Value: BH action code or 0 if nothing to do.
1054 static int mgsl_bh_action(struct mgsl_struct *info)
1056 unsigned long flags;
1059 spin_lock_irqsave(&info->irq_spinlock,flags);
1061 if (info->pending_bh & BH_RECEIVE) {
1062 info->pending_bh &= ~BH_RECEIVE;
1064 } else if (info->pending_bh & BH_TRANSMIT) {
1065 info->pending_bh &= ~BH_TRANSMIT;
1067 } else if (info->pending_bh & BH_STATUS) {
1068 info->pending_bh &= ~BH_STATUS;
1073 /* Mark BH routine as complete */
1074 info->bh_running = 0;
1075 info->bh_requested = 0;
1078 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1084 * Perform bottom half processing of work items queued by ISR.
1086 static void mgsl_bh_handler(void* Context)
1088 struct mgsl_struct *info = (struct mgsl_struct*)Context;
1094 if ( debug_level >= DEBUG_LEVEL_BH )
1095 printk( "%s(%d):mgsl_bh_handler(%s) entry\n",
1096 __FILE__,__LINE__,info->device_name);
1098 info->bh_running = 1;
1100 while((action = mgsl_bh_action(info)) != 0) {
1102 /* Process work item */
1103 if ( debug_level >= DEBUG_LEVEL_BH )
1104 printk( "%s(%d):mgsl_bh_handler() work item action=%d\n",
1105 __FILE__,__LINE__,action);
1110 mgsl_bh_receive(info);
1113 mgsl_bh_transmit(info);
1116 mgsl_bh_status(info);
1119 /* unknown work item ID */
1120 printk("Unknown work item ID=%08X!\n", action);
1125 if ( debug_level >= DEBUG_LEVEL_BH )
1126 printk( "%s(%d):mgsl_bh_handler(%s) exit\n",
1127 __FILE__,__LINE__,info->device_name);
1130 static void mgsl_bh_receive(struct mgsl_struct *info)
1132 int (*get_rx_frame)(struct mgsl_struct *info) =
1133 (info->params.mode == MGSL_MODE_HDLC ? mgsl_get_rx_frame : mgsl_get_raw_rx_frame);
1135 if ( debug_level >= DEBUG_LEVEL_BH )
1136 printk( "%s(%d):mgsl_bh_receive(%s)\n",
1137 __FILE__,__LINE__,info->device_name);
1141 if (info->rx_rcc_underrun) {
1142 unsigned long flags;
1143 spin_lock_irqsave(&info->irq_spinlock,flags);
1144 usc_start_receiver(info);
1145 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1148 } while(get_rx_frame(info));
1151 static void mgsl_bh_transmit(struct mgsl_struct *info)
1153 struct tty_struct *tty = info->tty;
1154 unsigned long flags;
1156 if ( debug_level >= DEBUG_LEVEL_BH )
1157 printk( "%s(%d):mgsl_bh_transmit() entry on %s\n",
1158 __FILE__,__LINE__,info->device_name);
1162 wake_up_interruptible(&tty->write_wait);
1165 /* if transmitter idle and loopmode_send_done_requested
1166 * then start echoing RxD to TxD
1168 spin_lock_irqsave(&info->irq_spinlock,flags);
1169 if ( !info->tx_active && info->loopmode_send_done_requested )
1170 usc_loopmode_send_done( info );
1171 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1174 static void mgsl_bh_status(struct mgsl_struct *info)
1176 if ( debug_level >= DEBUG_LEVEL_BH )
1177 printk( "%s(%d):mgsl_bh_status() entry on %s\n",
1178 __FILE__,__LINE__,info->device_name);
1180 info->ri_chkcount = 0;
1181 info->dsr_chkcount = 0;
1182 info->dcd_chkcount = 0;
1183 info->cts_chkcount = 0;
1186 /* mgsl_isr_receive_status()
1188 * Service a receive status interrupt. The type of status
1189 * interrupt is indicated by the state of the RCSR.
1190 * This is only used for HDLC mode.
1192 * Arguments: info pointer to device instance data
1193 * Return Value: None
1195 static void mgsl_isr_receive_status( struct mgsl_struct *info )
1197 u16 status = usc_InReg( info, RCSR );
1199 if ( debug_level >= DEBUG_LEVEL_ISR )
1200 printk("%s(%d):mgsl_isr_receive_status status=%04X\n",
1201 __FILE__,__LINE__,status);
1203 if ( (status & RXSTATUS_ABORT_RECEIVED) &&
1204 info->loopmode_insert_requested &&
1205 usc_loopmode_active(info) )
1207 ++info->icount.rxabort;
1208 info->loopmode_insert_requested = FALSE;
1210 /* clear CMR:13 to start echoing RxD to TxD */
1211 info->cmr_value &= ~BIT13;
1212 usc_OutReg(info, CMR, info->cmr_value);
1214 /* disable received abort irq (no longer required) */
1215 usc_OutReg(info, RICR,
1216 (usc_InReg(info, RICR) & ~RXSTATUS_ABORT_RECEIVED));
1219 if (status & (RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED)) {
1220 if (status & RXSTATUS_EXITED_HUNT)
1221 info->icount.exithunt++;
1222 if (status & RXSTATUS_IDLE_RECEIVED)
1223 info->icount.rxidle++;
1224 wake_up_interruptible(&info->event_wait_q);
1227 if (status & RXSTATUS_OVERRUN){
1228 info->icount.rxover++;
1229 usc_process_rxoverrun_sync( info );
1232 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
1233 usc_UnlatchRxstatusBits( info, status );
1235 } /* end of mgsl_isr_receive_status() */
1237 /* mgsl_isr_transmit_status()
1239 * Service a transmit status interrupt
1240 * HDLC mode :end of transmit frame
1241 * Async mode:all data is sent
1242 * transmit status is indicated by bits in the TCSR.
1244 * Arguments: info pointer to device instance data
1245 * Return Value: None
1247 static void mgsl_isr_transmit_status( struct mgsl_struct *info )
1249 u16 status = usc_InReg( info, TCSR );
1251 if ( debug_level >= DEBUG_LEVEL_ISR )
1252 printk("%s(%d):mgsl_isr_transmit_status status=%04X\n",
1253 __FILE__,__LINE__,status);
1255 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
1256 usc_UnlatchTxstatusBits( info, status );
1258 if ( status & (TXSTATUS_UNDERRUN | TXSTATUS_ABORT_SENT) )
1260 /* finished sending HDLC abort. This may leave */
1261 /* the TxFifo with data from the aborted frame */
1262 /* so purge the TxFifo. Also shutdown the DMA */
1263 /* channel in case there is data remaining in */
1264 /* the DMA buffer */
1265 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
1266 usc_RTCmd( info, RTCmd_PurgeTxFifo );
1269 if ( status & TXSTATUS_EOF_SENT )
1270 info->icount.txok++;
1271 else if ( status & TXSTATUS_UNDERRUN )
1272 info->icount.txunder++;
1273 else if ( status & TXSTATUS_ABORT_SENT )
1274 info->icount.txabort++;
1276 info->icount.txunder++;
1278 info->tx_active = 0;
1279 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1280 del_timer(&info->tx_timer);
1282 if ( info->drop_rts_on_tx_done ) {
1283 usc_get_serial_signals( info );
1284 if ( info->serial_signals & SerialSignal_RTS ) {
1285 info->serial_signals &= ~SerialSignal_RTS;
1286 usc_set_serial_signals( info );
1288 info->drop_rts_on_tx_done = 0;
1293 hdlcdev_tx_done(info);
1297 if (info->tty->stopped || info->tty->hw_stopped) {
1298 usc_stop_transmitter(info);
1301 info->pending_bh |= BH_TRANSMIT;
1304 } /* end of mgsl_isr_transmit_status() */
1306 /* mgsl_isr_io_pin()
1308 * Service an Input/Output pin interrupt. The type of
1309 * interrupt is indicated by bits in the MISR
1311 * Arguments: info pointer to device instance data
1312 * Return Value: None
1314 static void mgsl_isr_io_pin( struct mgsl_struct *info )
1316 struct mgsl_icount *icount;
1317 u16 status = usc_InReg( info, MISR );
1319 if ( debug_level >= DEBUG_LEVEL_ISR )
1320 printk("%s(%d):mgsl_isr_io_pin status=%04X\n",
1321 __FILE__,__LINE__,status);
1323 usc_ClearIrqPendingBits( info, IO_PIN );
1324 usc_UnlatchIostatusBits( info, status );
1326 if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
1327 MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
1328 icount = &info->icount;
1329 /* update input line counters */
1330 if (status & MISCSTATUS_RI_LATCHED) {
1331 if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1332 usc_DisablestatusIrqs(info,SICR_RI);
1334 if ( status & MISCSTATUS_RI )
1335 info->input_signal_events.ri_up++;
1337 info->input_signal_events.ri_down++;
1339 if (status & MISCSTATUS_DSR_LATCHED) {
1340 if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1341 usc_DisablestatusIrqs(info,SICR_DSR);
1343 if ( status & MISCSTATUS_DSR )
1344 info->input_signal_events.dsr_up++;
1346 info->input_signal_events.dsr_down++;
1348 if (status & MISCSTATUS_DCD_LATCHED) {
1349 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1350 usc_DisablestatusIrqs(info,SICR_DCD);
1352 if (status & MISCSTATUS_DCD) {
1353 info->input_signal_events.dcd_up++;
1355 info->input_signal_events.dcd_down++;
1358 hdlc_set_carrier(status & MISCSTATUS_DCD, info->netdev);
1361 if (status & MISCSTATUS_CTS_LATCHED)
1363 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1364 usc_DisablestatusIrqs(info,SICR_CTS);
1366 if ( status & MISCSTATUS_CTS )
1367 info->input_signal_events.cts_up++;
1369 info->input_signal_events.cts_down++;
1371 wake_up_interruptible(&info->status_event_wait_q);
1372 wake_up_interruptible(&info->event_wait_q);
1374 if ( (info->flags & ASYNC_CHECK_CD) &&
1375 (status & MISCSTATUS_DCD_LATCHED) ) {
1376 if ( debug_level >= DEBUG_LEVEL_ISR )
1377 printk("%s CD now %s...", info->device_name,
1378 (status & MISCSTATUS_DCD) ? "on" : "off");
1379 if (status & MISCSTATUS_DCD)
1380 wake_up_interruptible(&info->open_wait);
1382 if ( debug_level >= DEBUG_LEVEL_ISR )
1383 printk("doing serial hangup...");
1385 tty_hangup(info->tty);
1389 if ( (info->flags & ASYNC_CTS_FLOW) &&
1390 (status & MISCSTATUS_CTS_LATCHED) ) {
1391 if (info->tty->hw_stopped) {
1392 if (status & MISCSTATUS_CTS) {
1393 if ( debug_level >= DEBUG_LEVEL_ISR )
1394 printk("CTS tx start...");
1396 info->tty->hw_stopped = 0;
1397 usc_start_transmitter(info);
1398 info->pending_bh |= BH_TRANSMIT;
1402 if (!(status & MISCSTATUS_CTS)) {
1403 if ( debug_level >= DEBUG_LEVEL_ISR )
1404 printk("CTS tx stop...");
1406 info->tty->hw_stopped = 1;
1407 usc_stop_transmitter(info);
1413 info->pending_bh |= BH_STATUS;
1415 /* for diagnostics set IRQ flag */
1416 if ( status & MISCSTATUS_TXC_LATCHED ){
1417 usc_OutReg( info, SICR,
1418 (unsigned short)(usc_InReg(info,SICR) & ~(SICR_TXC_ACTIVE+SICR_TXC_INACTIVE)) );
1419 usc_UnlatchIostatusBits( info, MISCSTATUS_TXC_LATCHED );
1420 info->irq_occurred = 1;
1423 } /* end of mgsl_isr_io_pin() */
1425 /* mgsl_isr_transmit_data()
1427 * Service a transmit data interrupt (async mode only).
1429 * Arguments: info pointer to device instance data
1430 * Return Value: None
1432 static void mgsl_isr_transmit_data( struct mgsl_struct *info )
1434 if ( debug_level >= DEBUG_LEVEL_ISR )
1435 printk("%s(%d):mgsl_isr_transmit_data xmit_cnt=%d\n",
1436 __FILE__,__LINE__,info->xmit_cnt);
1438 usc_ClearIrqPendingBits( info, TRANSMIT_DATA );
1440 if (info->tty->stopped || info->tty->hw_stopped) {
1441 usc_stop_transmitter(info);
1445 if ( info->xmit_cnt )
1446 usc_load_txfifo( info );
1448 info->tx_active = 0;
1450 if (info->xmit_cnt < WAKEUP_CHARS)
1451 info->pending_bh |= BH_TRANSMIT;
1453 } /* end of mgsl_isr_transmit_data() */
1455 /* mgsl_isr_receive_data()
1457 * Service a receive data interrupt. This occurs
1458 * when operating in asynchronous interrupt transfer mode.
1459 * The receive data FIFO is flushed to the receive data buffers.
1461 * Arguments: info pointer to device instance data
1462 * Return Value: None
1464 static void mgsl_isr_receive_data( struct mgsl_struct *info )
1468 unsigned char DataByte;
1469 struct tty_struct *tty = info->tty;
1470 struct mgsl_icount *icount = &info->icount;
1472 if ( debug_level >= DEBUG_LEVEL_ISR )
1473 printk("%s(%d):mgsl_isr_receive_data\n",
1476 usc_ClearIrqPendingBits( info, RECEIVE_DATA );
1478 /* select FIFO status for RICR readback */
1479 usc_RCmd( info, RCmd_SelectRicrRxFifostatus );
1481 /* clear the Wordstatus bit so that status readback */
1482 /* only reflects the status of this byte */
1483 usc_OutReg( info, RICR+LSBONLY, (u16)(usc_InReg(info, RICR+LSBONLY) & ~BIT3 ));
1485 /* flush the receive FIFO */
1487 while( (Fifocount = (usc_InReg(info,RICR) >> 8)) ) {
1488 /* read one byte from RxFIFO */
1489 outw( (inw(info->io_base + CCAR) & 0x0780) | (RDR+LSBONLY),
1490 info->io_base + CCAR );
1491 DataByte = inb( info->io_base + CCAR );
1493 /* get the status of the received byte */
1494 status = usc_InReg(info, RCSR);
1495 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1496 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) )
1497 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
1499 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
1502 *tty->flip.char_buf_ptr = DataByte;
1505 *tty->flip.flag_buf_ptr = 0;
1506 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1507 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) ) {
1508 printk("rxerr=%04X\n",status);
1509 /* update error statistics */
1510 if ( status & RXSTATUS_BREAK_RECEIVED ) {
1511 status &= ~(RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR);
1513 } else if (status & RXSTATUS_PARITY_ERROR)
1515 else if (status & RXSTATUS_FRAMING_ERROR)
1517 else if (status & RXSTATUS_OVERRUN) {
1518 /* must issue purge fifo cmd before */
1519 /* 16C32 accepts more receive chars */
1520 usc_RTCmd(info,RTCmd_PurgeRxFifo);
1524 /* discard char if tty control flags say so */
1525 if (status & info->ignore_status_mask)
1528 status &= info->read_status_mask;
1530 if (status & RXSTATUS_BREAK_RECEIVED) {
1531 *tty->flip.flag_buf_ptr = TTY_BREAK;
1532 if (info->flags & ASYNC_SAK)
1534 } else if (status & RXSTATUS_PARITY_ERROR)
1535 *tty->flip.flag_buf_ptr = TTY_PARITY;
1536 else if (status & RXSTATUS_FRAMING_ERROR)
1537 *tty->flip.flag_buf_ptr = TTY_FRAME;
1538 if (status & RXSTATUS_OVERRUN) {
1539 /* Overrun is special, since it's
1540 * reported immediately, and doesn't
1541 * affect the current character
1543 if (tty->flip.count < TTY_FLIPBUF_SIZE) {
1545 tty->flip.flag_buf_ptr++;
1546 tty->flip.char_buf_ptr++;
1547 *tty->flip.flag_buf_ptr = TTY_OVERRUN;
1550 } /* end of if (error) */
1552 tty->flip.flag_buf_ptr++;
1553 tty->flip.char_buf_ptr++;
1557 if ( debug_level >= DEBUG_LEVEL_ISR ) {
1558 printk("%s(%d):mgsl_isr_receive_data flip count=%d\n",
1559 __FILE__,__LINE__,tty->flip.count);
1560 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
1561 __FILE__,__LINE__,icount->rx,icount->brk,
1562 icount->parity,icount->frame,icount->overrun);
1565 if ( tty->flip.count )
1566 tty_flip_buffer_push(tty);
1571 * Service a miscellaneos interrupt source.
1573 * Arguments: info pointer to device extension (instance data)
1574 * Return Value: None
1576 static void mgsl_isr_misc( struct mgsl_struct *info )
1578 u16 status = usc_InReg( info, MISR );
1580 if ( debug_level >= DEBUG_LEVEL_ISR )
1581 printk("%s(%d):mgsl_isr_misc status=%04X\n",
1582 __FILE__,__LINE__,status);
1584 if ((status & MISCSTATUS_RCC_UNDERRUN) &&
1585 (info->params.mode == MGSL_MODE_HDLC)) {
1587 /* turn off receiver and rx DMA */
1588 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
1589 usc_DmaCmd(info, DmaCmd_ResetRxChannel);
1590 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
1591 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
1592 usc_DisableInterrupts(info, RECEIVE_DATA + RECEIVE_STATUS);
1594 /* schedule BH handler to restart receiver */
1595 info->pending_bh |= BH_RECEIVE;
1596 info->rx_rcc_underrun = 1;
1599 usc_ClearIrqPendingBits( info, MISC );
1600 usc_UnlatchMiscstatusBits( info, status );
1602 } /* end of mgsl_isr_misc() */
1606 * Services undefined interrupt vectors from the
1607 * USC. (hence this function SHOULD never be called)
1609 * Arguments: info pointer to device extension (instance data)
1610 * Return Value: None
1612 static void mgsl_isr_null( struct mgsl_struct *info )
1615 } /* end of mgsl_isr_null() */
1617 /* mgsl_isr_receive_dma()
1619 * Service a receive DMA channel interrupt.
1620 * For this driver there are two sources of receive DMA interrupts
1621 * as identified in the Receive DMA mode Register (RDMR):
1623 * BIT3 EOA/EOL End of List, all receive buffers in receive
1624 * buffer list have been filled (no more free buffers
1625 * available). The DMA controller has shut down.
1627 * BIT2 EOB End of Buffer. This interrupt occurs when a receive
1628 * DMA buffer is terminated in response to completion
1629 * of a good frame or a frame with errors. The status
1630 * of the frame is stored in the buffer entry in the
1631 * list of receive buffer entries.
1633 * Arguments: info pointer to device instance data
1634 * Return Value: None
1636 static void mgsl_isr_receive_dma( struct mgsl_struct *info )
1640 /* clear interrupt pending and IUS bit for Rx DMA IRQ */
1641 usc_OutDmaReg( info, CDIR, BIT9+BIT1 );
1643 /* Read the receive DMA status to identify interrupt type. */
1644 /* This also clears the status bits. */
1645 status = usc_InDmaReg( info, RDMR );
1647 if ( debug_level >= DEBUG_LEVEL_ISR )
1648 printk("%s(%d):mgsl_isr_receive_dma(%s) status=%04X\n",
1649 __FILE__,__LINE__,info->device_name,status);
1651 info->pending_bh |= BH_RECEIVE;
1653 if ( status & BIT3 ) {
1654 info->rx_overflow = 1;
1655 info->icount.buf_overrun++;
1658 } /* end of mgsl_isr_receive_dma() */
1660 /* mgsl_isr_transmit_dma()
1662 * This function services a transmit DMA channel interrupt.
1664 * For this driver there is one source of transmit DMA interrupts
1665 * as identified in the Transmit DMA Mode Register (TDMR):
1667 * BIT2 EOB End of Buffer. This interrupt occurs when a
1668 * transmit DMA buffer has been emptied.
1670 * The driver maintains enough transmit DMA buffers to hold at least
1671 * one max frame size transmit frame. When operating in a buffered
1672 * transmit mode, there may be enough transmit DMA buffers to hold at
1673 * least two or more max frame size frames. On an EOB condition,
1674 * determine if there are any queued transmit buffers and copy into
1675 * transmit DMA buffers if we have room.
1677 * Arguments: info pointer to device instance data
1678 * Return Value: None
1680 static void mgsl_isr_transmit_dma( struct mgsl_struct *info )
1684 /* clear interrupt pending and IUS bit for Tx DMA IRQ */
1685 usc_OutDmaReg(info, CDIR, BIT8+BIT0 );
1687 /* Read the transmit DMA status to identify interrupt type. */
1688 /* This also clears the status bits. */
1690 status = usc_InDmaReg( info, TDMR );
1692 if ( debug_level >= DEBUG_LEVEL_ISR )
1693 printk("%s(%d):mgsl_isr_transmit_dma(%s) status=%04X\n",
1694 __FILE__,__LINE__,info->device_name,status);
1696 if ( status & BIT2 ) {
1697 --info->tx_dma_buffers_used;
1699 /* if there are transmit frames queued,
1700 * try to load the next one
1702 if ( load_next_tx_holding_buffer(info) ) {
1703 /* if call returns non-zero value, we have
1704 * at least one free tx holding buffer
1706 info->pending_bh |= BH_TRANSMIT;
1710 } /* end of mgsl_isr_transmit_dma() */
1714 * Interrupt service routine entry point.
1718 * irq interrupt number that caused interrupt
1719 * dev_id device ID supplied during interrupt registration
1720 * regs interrupted processor context
1722 * Return Value: None
1724 static irqreturn_t mgsl_interrupt(int irq, void *dev_id, struct pt_regs * regs)
1726 struct mgsl_struct * info;
1730 if ( debug_level >= DEBUG_LEVEL_ISR )
1731 printk("%s(%d):mgsl_interrupt(%d)entry.\n",
1732 __FILE__,__LINE__,irq);
1734 info = (struct mgsl_struct *)dev_id;
1738 spin_lock(&info->irq_spinlock);
1741 /* Read the interrupt vectors from hardware. */
1742 UscVector = usc_InReg(info, IVR) >> 9;
1743 DmaVector = usc_InDmaReg(info, DIVR);
1745 if ( debug_level >= DEBUG_LEVEL_ISR )
1746 printk("%s(%d):%s UscVector=%08X DmaVector=%08X\n",
1747 __FILE__,__LINE__,info->device_name,UscVector,DmaVector);
1749 if ( !UscVector && !DmaVector )
1752 /* Dispatch interrupt vector */
1754 (*UscIsrTable[UscVector])(info);
1755 else if ( (DmaVector&(BIT10|BIT9)) == BIT10)
1756 mgsl_isr_transmit_dma(info);
1758 mgsl_isr_receive_dma(info);
1760 if ( info->isr_overflow ) {
1761 printk(KERN_ERR"%s(%d):%s isr overflow irq=%d\n",
1762 __FILE__,__LINE__,info->device_name, irq);
1763 usc_DisableMasterIrqBit(info);
1764 usc_DisableDmaInterrupts(info,DICR_MASTER);
1769 /* Request bottom half processing if there's something
1770 * for it to do and the bh is not already running
1773 if ( info->pending_bh && !info->bh_running && !info->bh_requested ) {
1774 if ( debug_level >= DEBUG_LEVEL_ISR )
1775 printk("%s(%d):%s queueing bh task.\n",
1776 __FILE__,__LINE__,info->device_name);
1777 schedule_work(&info->task);
1778 info->bh_requested = 1;
1781 spin_unlock(&info->irq_spinlock);
1783 if ( debug_level >= DEBUG_LEVEL_ISR )
1784 printk("%s(%d):mgsl_interrupt(%d)exit.\n",
1785 __FILE__,__LINE__,irq);
1787 } /* end of mgsl_interrupt() */
1791 * Initialize and start device.
1793 * Arguments: info pointer to device instance data
1794 * Return Value: 0 if success, otherwise error code
1796 static int startup(struct mgsl_struct * info)
1800 if ( debug_level >= DEBUG_LEVEL_INFO )
1801 printk("%s(%d):mgsl_startup(%s)\n",__FILE__,__LINE__,info->device_name);
1803 if (info->flags & ASYNC_INITIALIZED)
1806 if (!info->xmit_buf) {
1807 /* allocate a page of memory for a transmit buffer */
1808 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1809 if (!info->xmit_buf) {
1810 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1811 __FILE__,__LINE__,info->device_name);
1816 info->pending_bh = 0;
1818 memset(&info->icount, 0, sizeof(info->icount));
1820 init_timer(&info->tx_timer);
1821 info->tx_timer.data = (unsigned long)info;
1822 info->tx_timer.function = mgsl_tx_timeout;
1824 /* Allocate and claim adapter resources */
1825 retval = mgsl_claim_resources(info);
1827 /* perform existence check and diagnostics */
1829 retval = mgsl_adapter_test(info);
1832 if (capable(CAP_SYS_ADMIN) && info->tty)
1833 set_bit(TTY_IO_ERROR, &info->tty->flags);
1834 mgsl_release_resources(info);
1838 /* program hardware for current parameters */
1839 mgsl_change_params(info);
1842 clear_bit(TTY_IO_ERROR, &info->tty->flags);
1844 info->flags |= ASYNC_INITIALIZED;
1848 } /* end of startup() */
1852 * Called by mgsl_close() and mgsl_hangup() to shutdown hardware
1854 * Arguments: info pointer to device instance data
1855 * Return Value: None
1857 static void shutdown(struct mgsl_struct * info)
1859 unsigned long flags;
1861 if (!(info->flags & ASYNC_INITIALIZED))
1864 if (debug_level >= DEBUG_LEVEL_INFO)
1865 printk("%s(%d):mgsl_shutdown(%s)\n",
1866 __FILE__,__LINE__, info->device_name );
1868 /* clear status wait queue because status changes */
1869 /* can't happen after shutting down the hardware */
1870 wake_up_interruptible(&info->status_event_wait_q);
1871 wake_up_interruptible(&info->event_wait_q);
1873 del_timer(&info->tx_timer);
1875 if (info->xmit_buf) {
1876 free_page((unsigned long) info->xmit_buf);
1877 info->xmit_buf = NULL;
1880 spin_lock_irqsave(&info->irq_spinlock,flags);
1881 usc_DisableMasterIrqBit(info);
1882 usc_stop_receiver(info);
1883 usc_stop_transmitter(info);
1884 usc_DisableInterrupts(info,RECEIVE_DATA + RECEIVE_STATUS +
1885 TRANSMIT_DATA + TRANSMIT_STATUS + IO_PIN + MISC );
1886 usc_DisableDmaInterrupts(info,DICR_MASTER + DICR_TRANSMIT + DICR_RECEIVE);
1888 /* Disable DMAEN (Port 7, Bit 14) */
1889 /* This disconnects the DMA request signal from the ISA bus */
1890 /* on the ISA adapter. This has no effect for the PCI adapter */
1891 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) | BIT14));
1893 /* Disable INTEN (Port 6, Bit12) */
1894 /* This disconnects the IRQ request signal to the ISA bus */
1895 /* on the ISA adapter. This has no effect for the PCI adapter */
1896 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) | BIT12));
1898 if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
1899 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1900 usc_set_serial_signals(info);
1903 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1905 mgsl_release_resources(info);
1908 set_bit(TTY_IO_ERROR, &info->tty->flags);
1910 info->flags &= ~ASYNC_INITIALIZED;
1912 } /* end of shutdown() */
1914 static void mgsl_program_hw(struct mgsl_struct *info)
1916 unsigned long flags;
1918 spin_lock_irqsave(&info->irq_spinlock,flags);
1920 usc_stop_receiver(info);
1921 usc_stop_transmitter(info);
1922 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1924 if (info->params.mode == MGSL_MODE_HDLC ||
1925 info->params.mode == MGSL_MODE_RAW ||
1927 usc_set_sync_mode(info);
1929 usc_set_async_mode(info);
1931 usc_set_serial_signals(info);
1933 info->dcd_chkcount = 0;
1934 info->cts_chkcount = 0;
1935 info->ri_chkcount = 0;
1936 info->dsr_chkcount = 0;
1938 usc_EnableStatusIrqs(info,SICR_CTS+SICR_DSR+SICR_DCD+SICR_RI);
1939 usc_EnableInterrupts(info, IO_PIN);
1940 usc_get_serial_signals(info);
1942 if (info->netcount || info->tty->termios->c_cflag & CREAD)
1943 usc_start_receiver(info);
1945 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1948 /* Reconfigure adapter based on new parameters
1950 static void mgsl_change_params(struct mgsl_struct *info)
1955 if (!info->tty || !info->tty->termios)
1958 if (debug_level >= DEBUG_LEVEL_INFO)
1959 printk("%s(%d):mgsl_change_params(%s)\n",
1960 __FILE__,__LINE__, info->device_name );
1962 cflag = info->tty->termios->c_cflag;
1964 /* if B0 rate (hangup) specified then negate DTR and RTS */
1965 /* otherwise assert DTR and RTS */
1967 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1969 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1971 /* byte size and parity */
1973 switch (cflag & CSIZE) {
1974 case CS5: info->params.data_bits = 5; break;
1975 case CS6: info->params.data_bits = 6; break;
1976 case CS7: info->params.data_bits = 7; break;
1977 case CS8: info->params.data_bits = 8; break;
1978 /* Never happens, but GCC is too dumb to figure it out */
1979 default: info->params.data_bits = 7; break;
1983 info->params.stop_bits = 2;
1985 info->params.stop_bits = 1;
1987 info->params.parity = ASYNC_PARITY_NONE;
1988 if (cflag & PARENB) {
1990 info->params.parity = ASYNC_PARITY_ODD;
1992 info->params.parity = ASYNC_PARITY_EVEN;
1995 info->params.parity = ASYNC_PARITY_SPACE;
1999 /* calculate number of jiffies to transmit a full
2000 * FIFO (32 bytes) at specified data rate
2002 bits_per_char = info->params.data_bits +
2003 info->params.stop_bits + 1;
2005 /* if port data rate is set to 460800 or less then
2006 * allow tty settings to override, otherwise keep the
2007 * current data rate.
2009 if (info->params.data_rate <= 460800)
2010 info->params.data_rate = tty_get_baud_rate(info->tty);
2012 if ( info->params.data_rate ) {
2013 info->timeout = (32*HZ*bits_per_char) /
2014 info->params.data_rate;
2016 info->timeout += HZ/50; /* Add .02 seconds of slop */
2018 if (cflag & CRTSCTS)
2019 info->flags |= ASYNC_CTS_FLOW;
2021 info->flags &= ~ASYNC_CTS_FLOW;
2024 info->flags &= ~ASYNC_CHECK_CD;
2026 info->flags |= ASYNC_CHECK_CD;
2028 /* process tty input control flags */
2030 info->read_status_mask = RXSTATUS_OVERRUN;
2031 if (I_INPCK(info->tty))
2032 info->read_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
2033 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2034 info->read_status_mask |= RXSTATUS_BREAK_RECEIVED;
2036 if (I_IGNPAR(info->tty))
2037 info->ignore_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
2038 if (I_IGNBRK(info->tty)) {
2039 info->ignore_status_mask |= RXSTATUS_BREAK_RECEIVED;
2040 /* If ignoring parity and break indicators, ignore
2041 * overruns too. (For real raw support).
2043 if (I_IGNPAR(info->tty))
2044 info->ignore_status_mask |= RXSTATUS_OVERRUN;
2047 mgsl_program_hw(info);
2049 } /* end of mgsl_change_params() */
2053 * Add a character to the transmit buffer.
2055 * Arguments: tty pointer to tty information structure
2056 * ch character to add to transmit buffer
2058 * Return Value: None
2060 static void mgsl_put_char(struct tty_struct *tty, unsigned char ch)
2062 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2063 unsigned long flags;
2065 if ( debug_level >= DEBUG_LEVEL_INFO ) {
2066 printk( "%s(%d):mgsl_put_char(%d) on %s\n",
2067 __FILE__,__LINE__,ch,info->device_name);
2070 if (mgsl_paranoia_check(info, tty->name, "mgsl_put_char"))
2073 if (!tty || !info->xmit_buf)
2076 spin_lock_irqsave(&info->irq_spinlock,flags);
2078 if ( (info->params.mode == MGSL_MODE_ASYNC ) || !info->tx_active ) {
2080 if (info->xmit_cnt < SERIAL_XMIT_SIZE - 1) {
2081 info->xmit_buf[info->xmit_head++] = ch;
2082 info->xmit_head &= SERIAL_XMIT_SIZE-1;
2087 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2089 } /* end of mgsl_put_char() */
2091 /* mgsl_flush_chars()
2093 * Enable transmitter so remaining characters in the
2094 * transmit buffer are sent.
2096 * Arguments: tty pointer to tty information structure
2097 * Return Value: None
2099 static void mgsl_flush_chars(struct tty_struct *tty)
2101 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2102 unsigned long flags;
2104 if ( debug_level >= DEBUG_LEVEL_INFO )
2105 printk( "%s(%d):mgsl_flush_chars() entry on %s xmit_cnt=%d\n",
2106 __FILE__,__LINE__,info->device_name,info->xmit_cnt);
2108 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_chars"))
2111 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
2115 if ( debug_level >= DEBUG_LEVEL_INFO )
2116 printk( "%s(%d):mgsl_flush_chars() entry on %s starting transmitter\n",
2117 __FILE__,__LINE__,info->device_name );
2119 spin_lock_irqsave(&info->irq_spinlock,flags);
2121 if (!info->tx_active) {
2122 if ( (info->params.mode == MGSL_MODE_HDLC ||
2123 info->params.mode == MGSL_MODE_RAW) && info->xmit_cnt ) {
2124 /* operating in synchronous (frame oriented) mode */
2125 /* copy data from circular xmit_buf to */
2126 /* transmit DMA buffer. */
2127 mgsl_load_tx_dma_buffer(info,
2128 info->xmit_buf,info->xmit_cnt);
2130 usc_start_transmitter(info);
2133 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2135 } /* end of mgsl_flush_chars() */
2139 * Send a block of data
2143 * tty pointer to tty information structure
2144 * buf pointer to buffer containing send data
2145 * count size of send data in bytes
2147 * Return Value: number of characters written
2149 static int mgsl_write(struct tty_struct * tty,
2150 const unsigned char *buf, int count)
2153 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2154 unsigned long flags;
2156 if ( debug_level >= DEBUG_LEVEL_INFO )
2157 printk( "%s(%d):mgsl_write(%s) count=%d\n",
2158 __FILE__,__LINE__,info->device_name,count);
2160 if (mgsl_paranoia_check(info, tty->name, "mgsl_write"))
2163 if (!tty || !info->xmit_buf || !tmp_buf)
2166 if ( info->params.mode == MGSL_MODE_HDLC ||
2167 info->params.mode == MGSL_MODE_RAW ) {
2168 /* operating in synchronous (frame oriented) mode */
2169 /* operating in synchronous (frame oriented) mode */
2170 if (info->tx_active) {
2172 if ( info->params.mode == MGSL_MODE_HDLC ) {
2176 /* transmitter is actively sending data -
2177 * if we have multiple transmit dma and
2178 * holding buffers, attempt to queue this
2179 * frame for transmission at a later time.
2181 if (info->tx_holding_count >= info->num_tx_holding_buffers ) {
2182 /* no tx holding buffers available */
2187 /* queue transmit frame request */
2189 save_tx_buffer_request(info,buf,count);
2191 /* if we have sufficient tx dma buffers,
2192 * load the next buffered tx request
2194 spin_lock_irqsave(&info->irq_spinlock,flags);
2195 load_next_tx_holding_buffer(info);
2196 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2200 /* if operating in HDLC LoopMode and the adapter */
2201 /* has yet to be inserted into the loop, we can't */
2204 if ( (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) &&
2205 !usc_loopmode_active(info) )
2211 if ( info->xmit_cnt ) {
2212 /* Send accumulated from send_char() calls */
2213 /* as frame and wait before accepting more data. */
2216 /* copy data from circular xmit_buf to */
2217 /* transmit DMA buffer. */
2218 mgsl_load_tx_dma_buffer(info,
2219 info->xmit_buf,info->xmit_cnt);
2220 if ( debug_level >= DEBUG_LEVEL_INFO )
2221 printk( "%s(%d):mgsl_write(%s) sync xmit_cnt flushing\n",
2222 __FILE__,__LINE__,info->device_name);
2224 if ( debug_level >= DEBUG_LEVEL_INFO )
2225 printk( "%s(%d):mgsl_write(%s) sync transmit accepted\n",
2226 __FILE__,__LINE__,info->device_name);
2228 info->xmit_cnt = count;
2229 mgsl_load_tx_dma_buffer(info,buf,count);
2233 spin_lock_irqsave(&info->irq_spinlock,flags);
2234 c = min_t(int, count,
2235 min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
2236 SERIAL_XMIT_SIZE - info->xmit_head));
2238 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2241 memcpy(info->xmit_buf + info->xmit_head, buf, c);
2242 info->xmit_head = ((info->xmit_head + c) &
2243 (SERIAL_XMIT_SIZE-1));
2244 info->xmit_cnt += c;
2245 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2252 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
2253 spin_lock_irqsave(&info->irq_spinlock,flags);
2254 if (!info->tx_active)
2255 usc_start_transmitter(info);
2256 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2259 if ( debug_level >= DEBUG_LEVEL_INFO )
2260 printk( "%s(%d):mgsl_write(%s) returning=%d\n",
2261 __FILE__,__LINE__,info->device_name,ret);
2265 } /* end of mgsl_write() */
2267 /* mgsl_write_room()
2269 * Return the count of free bytes in transmit buffer
2271 * Arguments: tty pointer to tty info structure
2272 * Return Value: None
2274 static int mgsl_write_room(struct tty_struct *tty)
2276 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2279 if (mgsl_paranoia_check(info, tty->name, "mgsl_write_room"))
2281 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
2285 if (debug_level >= DEBUG_LEVEL_INFO)
2286 printk("%s(%d):mgsl_write_room(%s)=%d\n",
2287 __FILE__,__LINE__, info->device_name,ret );
2289 if ( info->params.mode == MGSL_MODE_HDLC ||
2290 info->params.mode == MGSL_MODE_RAW ) {
2291 /* operating in synchronous (frame oriented) mode */
2292 if ( info->tx_active )
2295 return HDLC_MAX_FRAME_SIZE;
2300 } /* end of mgsl_write_room() */
2302 /* mgsl_chars_in_buffer()
2304 * Return the count of bytes in transmit buffer
2306 * Arguments: tty pointer to tty info structure
2307 * Return Value: None
2309 static int mgsl_chars_in_buffer(struct tty_struct *tty)
2311 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2313 if (debug_level >= DEBUG_LEVEL_INFO)
2314 printk("%s(%d):mgsl_chars_in_buffer(%s)\n",
2315 __FILE__,__LINE__, info->device_name );
2317 if (mgsl_paranoia_check(info, tty->name, "mgsl_chars_in_buffer"))
2320 if (debug_level >= DEBUG_LEVEL_INFO)
2321 printk("%s(%d):mgsl_chars_in_buffer(%s)=%d\n",
2322 __FILE__,__LINE__, info->device_name,info->xmit_cnt );
2324 if ( info->params.mode == MGSL_MODE_HDLC ||
2325 info->params.mode == MGSL_MODE_RAW ) {
2326 /* operating in synchronous (frame oriented) mode */
2327 if ( info->tx_active )
2328 return info->max_frame_size;
2333 return info->xmit_cnt;
2334 } /* end of mgsl_chars_in_buffer() */
2336 /* mgsl_flush_buffer()
2338 * Discard all data in the send buffer
2340 * Arguments: tty pointer to tty info structure
2341 * Return Value: None
2343 static void mgsl_flush_buffer(struct tty_struct *tty)
2345 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2346 unsigned long flags;
2348 if (debug_level >= DEBUG_LEVEL_INFO)
2349 printk("%s(%d):mgsl_flush_buffer(%s) entry\n",
2350 __FILE__,__LINE__, info->device_name );
2352 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_buffer"))
2355 spin_lock_irqsave(&info->irq_spinlock,flags);
2356 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
2357 del_timer(&info->tx_timer);
2358 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2360 wake_up_interruptible(&tty->write_wait);
2364 /* mgsl_send_xchar()
2366 * Send a high-priority XON/XOFF character
2368 * Arguments: tty pointer to tty info structure
2369 * ch character to send
2370 * Return Value: None
2372 static void mgsl_send_xchar(struct tty_struct *tty, char ch)
2374 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2375 unsigned long flags;
2377 if (debug_level >= DEBUG_LEVEL_INFO)
2378 printk("%s(%d):mgsl_send_xchar(%s,%d)\n",
2379 __FILE__,__LINE__, info->device_name, ch );
2381 if (mgsl_paranoia_check(info, tty->name, "mgsl_send_xchar"))
2386 /* Make sure transmit interrupts are on */
2387 spin_lock_irqsave(&info->irq_spinlock,flags);
2388 if (!info->tx_enabled)
2389 usc_start_transmitter(info);
2390 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2392 } /* end of mgsl_send_xchar() */
2396 * Signal remote device to throttle send data (our receive data)
2398 * Arguments: tty pointer to tty info structure
2399 * Return Value: None
2401 static void mgsl_throttle(struct tty_struct * tty)
2403 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2404 unsigned long flags;
2406 if (debug_level >= DEBUG_LEVEL_INFO)
2407 printk("%s(%d):mgsl_throttle(%s) entry\n",
2408 __FILE__,__LINE__, info->device_name );
2410 if (mgsl_paranoia_check(info, tty->name, "mgsl_throttle"))
2414 mgsl_send_xchar(tty, STOP_CHAR(tty));
2416 if (tty->termios->c_cflag & CRTSCTS) {
2417 spin_lock_irqsave(&info->irq_spinlock,flags);
2418 info->serial_signals &= ~SerialSignal_RTS;
2419 usc_set_serial_signals(info);
2420 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2422 } /* end of mgsl_throttle() */
2424 /* mgsl_unthrottle()
2426 * Signal remote device to stop throttling send data (our receive data)
2428 * Arguments: tty pointer to tty info structure
2429 * Return Value: None
2431 static void mgsl_unthrottle(struct tty_struct * tty)
2433 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2434 unsigned long flags;
2436 if (debug_level >= DEBUG_LEVEL_INFO)
2437 printk("%s(%d):mgsl_unthrottle(%s) entry\n",
2438 __FILE__,__LINE__, info->device_name );
2440 if (mgsl_paranoia_check(info, tty->name, "mgsl_unthrottle"))
2447 mgsl_send_xchar(tty, START_CHAR(tty));
2450 if (tty->termios->c_cflag & CRTSCTS) {
2451 spin_lock_irqsave(&info->irq_spinlock,flags);
2452 info->serial_signals |= SerialSignal_RTS;
2453 usc_set_serial_signals(info);
2454 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2457 } /* end of mgsl_unthrottle() */
2461 * get the current serial parameters information
2463 * Arguments: info pointer to device instance data
2464 * user_icount pointer to buffer to hold returned stats
2466 * Return Value: 0 if success, otherwise error code
2468 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount __user *user_icount)
2472 if (debug_level >= DEBUG_LEVEL_INFO)
2473 printk("%s(%d):mgsl_get_params(%s)\n",
2474 __FILE__,__LINE__, info->device_name);
2477 memset(&info->icount, 0, sizeof(info->icount));
2479 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2486 } /* end of mgsl_get_stats() */
2488 /* mgsl_get_params()
2490 * get the current serial parameters information
2492 * Arguments: info pointer to device instance data
2493 * user_params pointer to buffer to hold returned params
2495 * Return Value: 0 if success, otherwise error code
2497 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params)
2500 if (debug_level >= DEBUG_LEVEL_INFO)
2501 printk("%s(%d):mgsl_get_params(%s)\n",
2502 __FILE__,__LINE__, info->device_name);
2504 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2506 if ( debug_level >= DEBUG_LEVEL_INFO )
2507 printk( "%s(%d):mgsl_get_params(%s) user buffer copy failed\n",
2508 __FILE__,__LINE__,info->device_name);
2514 } /* end of mgsl_get_params() */
2516 /* mgsl_set_params()
2518 * set the serial parameters
2522 * info pointer to device instance data
2523 * new_params user buffer containing new serial params
2525 * Return Value: 0 if success, otherwise error code
2527 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params)
2529 unsigned long flags;
2530 MGSL_PARAMS tmp_params;
2533 if (debug_level >= DEBUG_LEVEL_INFO)
2534 printk("%s(%d):mgsl_set_params %s\n", __FILE__,__LINE__,
2535 info->device_name );
2536 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2538 if ( debug_level >= DEBUG_LEVEL_INFO )
2539 printk( "%s(%d):mgsl_set_params(%s) user buffer copy failed\n",
2540 __FILE__,__LINE__,info->device_name);
2544 spin_lock_irqsave(&info->irq_spinlock,flags);
2545 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2546 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2548 mgsl_change_params(info);
2552 } /* end of mgsl_set_params() */
2554 /* mgsl_get_txidle()
2556 * get the current transmit idle mode
2558 * Arguments: info pointer to device instance data
2559 * idle_mode pointer to buffer to hold returned idle mode
2561 * Return Value: 0 if success, otherwise error code
2563 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode)
2567 if (debug_level >= DEBUG_LEVEL_INFO)
2568 printk("%s(%d):mgsl_get_txidle(%s)=%d\n",
2569 __FILE__,__LINE__, info->device_name, info->idle_mode);
2571 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2573 if ( debug_level >= DEBUG_LEVEL_INFO )
2574 printk( "%s(%d):mgsl_get_txidle(%s) user buffer copy failed\n",
2575 __FILE__,__LINE__,info->device_name);
2581 } /* end of mgsl_get_txidle() */
2583 /* mgsl_set_txidle() service ioctl to set transmit idle mode
2585 * Arguments: info pointer to device instance data
2586 * idle_mode new idle mode
2588 * Return Value: 0 if success, otherwise error code
2590 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode)
2592 unsigned long flags;
2594 if (debug_level >= DEBUG_LEVEL_INFO)
2595 printk("%s(%d):mgsl_set_txidle(%s,%d)\n", __FILE__,__LINE__,
2596 info->device_name, idle_mode );
2598 spin_lock_irqsave(&info->irq_spinlock,flags);
2599 info->idle_mode = idle_mode;
2600 usc_set_txidle( info );
2601 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2604 } /* end of mgsl_set_txidle() */
2608 * enable or disable the transmitter
2612 * info pointer to device instance data
2613 * enable 1 = enable, 0 = disable
2615 * Return Value: 0 if success, otherwise error code
2617 static int mgsl_txenable(struct mgsl_struct * info, int enable)
2619 unsigned long flags;
2621 if (debug_level >= DEBUG_LEVEL_INFO)
2622 printk("%s(%d):mgsl_txenable(%s,%d)\n", __FILE__,__LINE__,
2623 info->device_name, enable);
2625 spin_lock_irqsave(&info->irq_spinlock,flags);
2627 if ( !info->tx_enabled ) {
2629 usc_start_transmitter(info);
2630 /*--------------------------------------------------
2631 * if HDLC/SDLC Loop mode, attempt to insert the
2632 * station in the 'loop' by setting CMR:13. Upon
2633 * receipt of the next GoAhead (RxAbort) sequence,
2634 * the OnLoop indicator (CCSR:7) should go active
2635 * to indicate that we are on the loop
2636 *--------------------------------------------------*/
2637 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2638 usc_loopmode_insert_request( info );
2641 if ( info->tx_enabled )
2642 usc_stop_transmitter(info);
2644 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2647 } /* end of mgsl_txenable() */
2649 /* mgsl_txabort() abort send HDLC frame
2651 * Arguments: info pointer to device instance data
2652 * Return Value: 0 if success, otherwise error code
2654 static int mgsl_txabort(struct mgsl_struct * info)
2656 unsigned long flags;
2658 if (debug_level >= DEBUG_LEVEL_INFO)
2659 printk("%s(%d):mgsl_txabort(%s)\n", __FILE__,__LINE__,
2662 spin_lock_irqsave(&info->irq_spinlock,flags);
2663 if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC )
2665 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2666 usc_loopmode_cancel_transmit( info );
2668 usc_TCmd(info,TCmd_SendAbort);
2670 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2673 } /* end of mgsl_txabort() */
2675 /* mgsl_rxenable() enable or disable the receiver
2677 * Arguments: info pointer to device instance data
2678 * enable 1 = enable, 0 = disable
2679 * Return Value: 0 if success, otherwise error code
2681 static int mgsl_rxenable(struct mgsl_struct * info, int enable)
2683 unsigned long flags;
2685 if (debug_level >= DEBUG_LEVEL_INFO)
2686 printk("%s(%d):mgsl_rxenable(%s,%d)\n", __FILE__,__LINE__,
2687 info->device_name, enable);
2689 spin_lock_irqsave(&info->irq_spinlock,flags);
2691 if ( !info->rx_enabled )
2692 usc_start_receiver(info);
2694 if ( info->rx_enabled )
2695 usc_stop_receiver(info);
2697 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2700 } /* end of mgsl_rxenable() */
2702 /* mgsl_wait_event() wait for specified event to occur
2704 * Arguments: info pointer to device instance data
2705 * mask pointer to bitmask of events to wait for
2706 * Return Value: 0 if successful and bit mask updated with
2707 * of events triggerred,
2708 * otherwise error code
2710 static int mgsl_wait_event(struct mgsl_struct * info, int __user * mask_ptr)
2712 unsigned long flags;
2715 struct mgsl_icount cprev, cnow;
2718 struct _input_signal_events oldsigs, newsigs;
2719 DECLARE_WAITQUEUE(wait, current);
2721 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
2726 if (debug_level >= DEBUG_LEVEL_INFO)
2727 printk("%s(%d):mgsl_wait_event(%s,%d)\n", __FILE__,__LINE__,
2728 info->device_name, mask);
2730 spin_lock_irqsave(&info->irq_spinlock,flags);
2732 /* return immediately if state matches requested events */
2733 usc_get_serial_signals(info);
2734 s = info->serial_signals;
2736 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2737 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2738 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2739 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2741 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2745 /* save current irq counts */
2746 cprev = info->icount;
2747 oldsigs = info->input_signal_events;
2749 /* enable hunt and idle irqs if needed */
2750 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2751 u16 oldreg = usc_InReg(info,RICR);
2752 u16 newreg = oldreg +
2753 (mask & MgslEvent_ExitHuntMode ? RXSTATUS_EXITED_HUNT:0) +
2754 (mask & MgslEvent_IdleReceived ? RXSTATUS_IDLE_RECEIVED:0);
2755 if (oldreg != newreg)
2756 usc_OutReg(info, RICR, newreg);
2759 set_current_state(TASK_INTERRUPTIBLE);
2760 add_wait_queue(&info->event_wait_q, &wait);
2762 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2767 if (signal_pending(current)) {
2772 /* get current irq counts */
2773 spin_lock_irqsave(&info->irq_spinlock,flags);
2774 cnow = info->icount;
2775 newsigs = info->input_signal_events;
2776 set_current_state(TASK_INTERRUPTIBLE);
2777 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2779 /* if no change, wait aborted for some reason */
2780 if (newsigs.dsr_up == oldsigs.dsr_up &&
2781 newsigs.dsr_down == oldsigs.dsr_down &&
2782 newsigs.dcd_up == oldsigs.dcd_up &&
2783 newsigs.dcd_down == oldsigs.dcd_down &&
2784 newsigs.cts_up == oldsigs.cts_up &&
2785 newsigs.cts_down == oldsigs.cts_down &&
2786 newsigs.ri_up == oldsigs.ri_up &&
2787 newsigs.ri_down == oldsigs.ri_down &&
2788 cnow.exithunt == cprev.exithunt &&
2789 cnow.rxidle == cprev.rxidle) {
2795 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2796 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2797 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2798 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2799 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2800 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2801 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2802 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2803 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2804 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2812 remove_wait_queue(&info->event_wait_q, &wait);
2813 set_current_state(TASK_RUNNING);
2815 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2816 spin_lock_irqsave(&info->irq_spinlock,flags);
2817 if (!waitqueue_active(&info->event_wait_q)) {
2818 /* disable enable exit hunt mode/idle rcvd IRQs */
2819 usc_OutReg(info, RICR, usc_InReg(info,RICR) &
2820 ~(RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED));
2822 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2826 PUT_USER(rc, events, mask_ptr);
2830 } /* end of mgsl_wait_event() */
2832 static int modem_input_wait(struct mgsl_struct *info,int arg)
2834 unsigned long flags;
2836 struct mgsl_icount cprev, cnow;
2837 DECLARE_WAITQUEUE(wait, current);
2839 /* save current irq counts */
2840 spin_lock_irqsave(&info->irq_spinlock,flags);
2841 cprev = info->icount;
2842 add_wait_queue(&info->status_event_wait_q, &wait);
2843 set_current_state(TASK_INTERRUPTIBLE);
2844 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2848 if (signal_pending(current)) {
2853 /* get new irq counts */
2854 spin_lock_irqsave(&info->irq_spinlock,flags);
2855 cnow = info->icount;
2856 set_current_state(TASK_INTERRUPTIBLE);
2857 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2859 /* if no change, wait aborted for some reason */
2860 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2861 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2866 /* check for change in caller specified modem input */
2867 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2868 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2869 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2870 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2877 remove_wait_queue(&info->status_event_wait_q, &wait);
2878 set_current_state(TASK_RUNNING);
2882 /* return the state of the serial control and status signals
2884 static int tiocmget(struct tty_struct *tty, struct file *file)
2886 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2887 unsigned int result;
2888 unsigned long flags;
2890 spin_lock_irqsave(&info->irq_spinlock,flags);
2891 usc_get_serial_signals(info);
2892 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2894 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2895 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2896 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2897 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
2898 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2899 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2901 if (debug_level >= DEBUG_LEVEL_INFO)
2902 printk("%s(%d):%s tiocmget() value=%08X\n",
2903 __FILE__,__LINE__, info->device_name, result );
2907 /* set modem control signals (DTR/RTS)
2909 static int tiocmset(struct tty_struct *tty, struct file *file,
2910 unsigned int set, unsigned int clear)
2912 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2913 unsigned long flags;
2915 if (debug_level >= DEBUG_LEVEL_INFO)
2916 printk("%s(%d):%s tiocmset(%x,%x)\n",
2917 __FILE__,__LINE__,info->device_name, set, clear);
2919 if (set & TIOCM_RTS)
2920 info->serial_signals |= SerialSignal_RTS;
2921 if (set & TIOCM_DTR)
2922 info->serial_signals |= SerialSignal_DTR;
2923 if (clear & TIOCM_RTS)
2924 info->serial_signals &= ~SerialSignal_RTS;
2925 if (clear & TIOCM_DTR)
2926 info->serial_signals &= ~SerialSignal_DTR;
2928 spin_lock_irqsave(&info->irq_spinlock,flags);
2929 usc_set_serial_signals(info);
2930 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2935 /* mgsl_break() Set or clear transmit break condition
2937 * Arguments: tty pointer to tty instance data
2938 * break_state -1=set break condition, 0=clear
2939 * Return Value: None
2941 static void mgsl_break(struct tty_struct *tty, int break_state)
2943 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
2944 unsigned long flags;
2946 if (debug_level >= DEBUG_LEVEL_INFO)
2947 printk("%s(%d):mgsl_break(%s,%d)\n",
2948 __FILE__,__LINE__, info->device_name, break_state);
2950 if (mgsl_paranoia_check(info, tty->name, "mgsl_break"))
2953 spin_lock_irqsave(&info->irq_spinlock,flags);
2954 if (break_state == -1)
2955 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) | BIT7));
2957 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) & ~BIT7));
2958 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2960 } /* end of mgsl_break() */
2962 /* mgsl_ioctl() Service an IOCTL request
2966 * tty pointer to tty instance data
2967 * file pointer to associated file object for device
2968 * cmd IOCTL command code
2969 * arg command argument/context
2971 * Return Value: 0 if success, otherwise error code
2973 static int mgsl_ioctl(struct tty_struct *tty, struct file * file,
2974 unsigned int cmd, unsigned long arg)
2976 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
2978 if (debug_level >= DEBUG_LEVEL_INFO)
2979 printk("%s(%d):mgsl_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2980 info->device_name, cmd );
2982 if (mgsl_paranoia_check(info, tty->name, "mgsl_ioctl"))
2985 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2986 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
2987 if (tty->flags & (1 << TTY_IO_ERROR))
2991 return mgsl_ioctl_common(info, cmd, arg);
2994 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg)
2997 struct mgsl_icount cnow; /* kernel counter temps */
2998 void __user *argp = (void __user *)arg;
2999 struct serial_icounter_struct __user *p_cuser; /* user space */
3000 unsigned long flags;
3003 case MGSL_IOCGPARAMS:
3004 return mgsl_get_params(info, argp);
3005 case MGSL_IOCSPARAMS:
3006 return mgsl_set_params(info, argp);
3007 case MGSL_IOCGTXIDLE:
3008 return mgsl_get_txidle(info, argp);
3009 case MGSL_IOCSTXIDLE:
3010 return mgsl_set_txidle(info,(int)arg);
3011 case MGSL_IOCTXENABLE:
3012 return mgsl_txenable(info,(int)arg);
3013 case MGSL_IOCRXENABLE:
3014 return mgsl_rxenable(info,(int)arg);
3015 case MGSL_IOCTXABORT:
3016 return mgsl_txabort(info);
3017 case MGSL_IOCGSTATS:
3018 return mgsl_get_stats(info, argp);
3019 case MGSL_IOCWAITEVENT:
3020 return mgsl_wait_event(info, argp);
3021 case MGSL_IOCLOOPTXDONE:
3022 return mgsl_loopmode_send_done(info);
3023 /* Wait for modem input (DCD,RI,DSR,CTS) change
3024 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
3027 return modem_input_wait(info,(int)arg);
3030 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
3031 * Return: write counters to the user passed counter struct
3032 * NB: both 1->0 and 0->1 transitions are counted except for
3033 * RI where only 0->1 is counted.
3036 spin_lock_irqsave(&info->irq_spinlock,flags);
3037 cnow = info->icount;
3038 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3040 PUT_USER(error,cnow.cts, &p_cuser->cts);
3041 if (error) return error;
3042 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
3043 if (error) return error;
3044 PUT_USER(error,cnow.rng, &p_cuser->rng);
3045 if (error) return error;
3046 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
3047 if (error) return error;
3048 PUT_USER(error,cnow.rx, &p_cuser->rx);
3049 if (error) return error;
3050 PUT_USER(error,cnow.tx, &p_cuser->tx);
3051 if (error) return error;
3052 PUT_USER(error,cnow.frame, &p_cuser->frame);
3053 if (error) return error;
3054 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
3055 if (error) return error;
3056 PUT_USER(error,cnow.parity, &p_cuser->parity);
3057 if (error) return error;
3058 PUT_USER(error,cnow.brk, &p_cuser->brk);
3059 if (error) return error;
3060 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
3061 if (error) return error;
3064 return -ENOIOCTLCMD;
3069 /* mgsl_set_termios()
3071 * Set new termios settings
3075 * tty pointer to tty structure
3076 * termios pointer to buffer to hold returned old termios
3078 * Return Value: None
3080 static void mgsl_set_termios(struct tty_struct *tty, struct termios *old_termios)
3082 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
3083 unsigned long flags;
3085 if (debug_level >= DEBUG_LEVEL_INFO)
3086 printk("%s(%d):mgsl_set_termios %s\n", __FILE__,__LINE__,
3087 tty->driver->name );
3089 /* just return if nothing has changed */
3090 if ((tty->termios->c_cflag == old_termios->c_cflag)
3091 && (RELEVANT_IFLAG(tty->termios->c_iflag)
3092 == RELEVANT_IFLAG(old_termios->c_iflag)))
3095 mgsl_change_params(info);
3097 /* Handle transition to B0 status */
3098 if (old_termios->c_cflag & CBAUD &&
3099 !(tty->termios->c_cflag & CBAUD)) {
3100 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3101 spin_lock_irqsave(&info->irq_spinlock,flags);
3102 usc_set_serial_signals(info);
3103 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3106 /* Handle transition away from B0 status */
3107 if (!(old_termios->c_cflag & CBAUD) &&
3108 tty->termios->c_cflag & CBAUD) {
3109 info->serial_signals |= SerialSignal_DTR;
3110 if (!(tty->termios->c_cflag & CRTSCTS) ||
3111 !test_bit(TTY_THROTTLED, &tty->flags)) {
3112 info->serial_signals |= SerialSignal_RTS;
3114 spin_lock_irqsave(&info->irq_spinlock,flags);
3115 usc_set_serial_signals(info);
3116 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3119 /* Handle turning off CRTSCTS */
3120 if (old_termios->c_cflag & CRTSCTS &&
3121 !(tty->termios->c_cflag & CRTSCTS)) {
3122 tty->hw_stopped = 0;
3126 } /* end of mgsl_set_termios() */
3130 * Called when port is closed. Wait for remaining data to be
3131 * sent. Disable port and free resources.
3135 * tty pointer to open tty structure
3136 * filp pointer to open file object
3138 * Return Value: None
3140 static void mgsl_close(struct tty_struct *tty, struct file * filp)
3142 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3144 if (mgsl_paranoia_check(info, tty->name, "mgsl_close"))
3147 if (debug_level >= DEBUG_LEVEL_INFO)
3148 printk("%s(%d):mgsl_close(%s) entry, count=%d\n",
3149 __FILE__,__LINE__, info->device_name, info->count);
3154 if (tty_hung_up_p(filp))
3157 if ((tty->count == 1) && (info->count != 1)) {
3159 * tty->count is 1 and the tty structure will be freed.
3160 * info->count should be one in this case.
3161 * if it's not, correct it so that the port is shutdown.
3163 printk("mgsl_close: bad refcount; tty->count is 1, "
3164 "info->count is %d\n", info->count);
3170 /* if at least one open remaining, leave hardware active */
3174 info->flags |= ASYNC_CLOSING;
3176 /* set tty->closing to notify line discipline to
3177 * only process XON/XOFF characters. Only the N_TTY
3178 * discipline appears to use this (ppp does not).
3182 /* wait for transmit data to clear all layers */
3184 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
3185 if (debug_level >= DEBUG_LEVEL_INFO)
3186 printk("%s(%d):mgsl_close(%s) calling tty_wait_until_sent\n",
3187 __FILE__,__LINE__, info->device_name );
3188 tty_wait_until_sent(tty, info->closing_wait);
3191 if (info->flags & ASYNC_INITIALIZED)
3192 mgsl_wait_until_sent(tty, info->timeout);
3194 if (tty->driver->flush_buffer)
3195 tty->driver->flush_buffer(tty);
3197 tty_ldisc_flush(tty);
3204 if (info->blocked_open) {
3205 if (info->close_delay) {
3206 msleep_interruptible(jiffies_to_msecs(info->close_delay));
3208 wake_up_interruptible(&info->open_wait);
3211 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
3213 wake_up_interruptible(&info->close_wait);
3216 if (debug_level >= DEBUG_LEVEL_INFO)
3217 printk("%s(%d):mgsl_close(%s) exit, count=%d\n", __FILE__,__LINE__,
3218 tty->driver->name, info->count);
3220 } /* end of mgsl_close() */
3222 /* mgsl_wait_until_sent()
3224 * Wait until the transmitter is empty.
3228 * tty pointer to tty info structure
3229 * timeout time to wait for send completion
3231 * Return Value: None
3233 static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout)
3235 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3236 unsigned long orig_jiffies, char_time;
3241 if (debug_level >= DEBUG_LEVEL_INFO)
3242 printk("%s(%d):mgsl_wait_until_sent(%s) entry\n",
3243 __FILE__,__LINE__, info->device_name );
3245 if (mgsl_paranoia_check(info, tty->name, "mgsl_wait_until_sent"))
3248 if (!(info->flags & ASYNC_INITIALIZED))
3251 orig_jiffies = jiffies;
3253 /* Set check interval to 1/5 of estimated time to
3254 * send a character, and make it at least 1. The check
3255 * interval should also be less than the timeout.
3256 * Note: use tight timings here to satisfy the NIST-PCTS.
3259 if ( info->params.data_rate ) {
3260 char_time = info->timeout/(32 * 5);
3267 char_time = min_t(unsigned long, char_time, timeout);
3269 if ( info->params.mode == MGSL_MODE_HDLC ||
3270 info->params.mode == MGSL_MODE_RAW ) {
3271 while (info->tx_active) {
3272 msleep_interruptible(jiffies_to_msecs(char_time));
3273 if (signal_pending(current))
3275 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3279 while (!(usc_InReg(info,TCSR) & TXSTATUS_ALL_SENT) &&
3281 msleep_interruptible(jiffies_to_msecs(char_time));
3282 if (signal_pending(current))
3284 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3290 if (debug_level >= DEBUG_LEVEL_INFO)
3291 printk("%s(%d):mgsl_wait_until_sent(%s) exit\n",
3292 __FILE__,__LINE__, info->device_name );
3294 } /* end of mgsl_wait_until_sent() */
3298 * Called by tty_hangup() when a hangup is signaled.
3299 * This is the same as to closing all open files for the port.
3301 * Arguments: tty pointer to associated tty object
3302 * Return Value: None
3304 static void mgsl_hangup(struct tty_struct *tty)
3306 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3308 if (debug_level >= DEBUG_LEVEL_INFO)
3309 printk("%s(%d):mgsl_hangup(%s)\n",
3310 __FILE__,__LINE__, info->device_name );
3312 if (mgsl_paranoia_check(info, tty->name, "mgsl_hangup"))
3315 mgsl_flush_buffer(tty);
3319 info->flags &= ~ASYNC_NORMAL_ACTIVE;
3322 wake_up_interruptible(&info->open_wait);
3324 } /* end of mgsl_hangup() */
3326 /* block_til_ready()
3328 * Block the current process until the specified port
3329 * is ready to be opened.
3333 * tty pointer to tty info structure
3334 * filp pointer to open file object
3335 * info pointer to device instance data
3337 * Return Value: 0 if success, otherwise error code
3339 static int block_til_ready(struct tty_struct *tty, struct file * filp,
3340 struct mgsl_struct *info)
3342 DECLARE_WAITQUEUE(wait, current);
3344 int do_clocal = 0, extra_count = 0;
3345 unsigned long flags;
3347 if (debug_level >= DEBUG_LEVEL_INFO)
3348 printk("%s(%d):block_til_ready on %s\n",
3349 __FILE__,__LINE__, tty->driver->name );
3351 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3352 /* nonblock mode is set or port is not enabled */
3353 info->flags |= ASYNC_NORMAL_ACTIVE;
3357 if (tty->termios->c_cflag & CLOCAL)
3360 /* Wait for carrier detect and the line to become
3361 * free (i.e., not in use by the callout). While we are in
3362 * this loop, info->count is dropped by one, so that
3363 * mgsl_close() knows when to free things. We restore it upon
3364 * exit, either normal or abnormal.
3368 add_wait_queue(&info->open_wait, &wait);
3370 if (debug_level >= DEBUG_LEVEL_INFO)
3371 printk("%s(%d):block_til_ready before block on %s count=%d\n",
3372 __FILE__,__LINE__, tty->driver->name, info->count );
3374 spin_lock_irqsave(&info->irq_spinlock, flags);
3375 if (!tty_hung_up_p(filp)) {
3379 spin_unlock_irqrestore(&info->irq_spinlock, flags);
3380 info->blocked_open++;
3383 if (tty->termios->c_cflag & CBAUD) {
3384 spin_lock_irqsave(&info->irq_spinlock,flags);
3385 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3386 usc_set_serial_signals(info);
3387 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3390 set_current_state(TASK_INTERRUPTIBLE);
3392 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
3393 retval = (info->flags & ASYNC_HUP_NOTIFY) ?
3394 -EAGAIN : -ERESTARTSYS;
3398 spin_lock_irqsave(&info->irq_spinlock,flags);
3399 usc_get_serial_signals(info);
3400 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3402 if (!(info->flags & ASYNC_CLOSING) &&
3403 (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
3407 if (signal_pending(current)) {
3408 retval = -ERESTARTSYS;
3412 if (debug_level >= DEBUG_LEVEL_INFO)
3413 printk("%s(%d):block_til_ready blocking on %s count=%d\n",
3414 __FILE__,__LINE__, tty->driver->name, info->count );
3419 set_current_state(TASK_RUNNING);
3420 remove_wait_queue(&info->open_wait, &wait);
3424 info->blocked_open--;
3426 if (debug_level >= DEBUG_LEVEL_INFO)
3427 printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
3428 __FILE__,__LINE__, tty->driver->name, info->count );
3431 info->flags |= ASYNC_NORMAL_ACTIVE;
3435 } /* end of block_til_ready() */
3439 * Called when a port is opened. Init and enable port.
3440 * Perform serial-specific initialization for the tty structure.
3442 * Arguments: tty pointer to tty info structure
3443 * filp associated file pointer
3445 * Return Value: 0 if success, otherwise error code
3447 static int mgsl_open(struct tty_struct *tty, struct file * filp)
3449 struct mgsl_struct *info;
3452 unsigned long flags;
3454 /* verify range of specified line number */
3456 if ((line < 0) || (line >= mgsl_device_count)) {
3457 printk("%s(%d):mgsl_open with invalid line #%d.\n",
3458 __FILE__,__LINE__,line);
3462 /* find the info structure for the specified line */
3463 info = mgsl_device_list;
3464 while(info && info->line != line)
3465 info = info->next_device;
3466 if (mgsl_paranoia_check(info, tty->name, "mgsl_open"))
3469 tty->driver_data = info;
3472 if (debug_level >= DEBUG_LEVEL_INFO)
3473 printk("%s(%d):mgsl_open(%s), old ref count = %d\n",
3474 __FILE__,__LINE__,tty->driver->name, info->count);
3476 /* If port is closing, signal caller to try again */
3477 if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
3478 if (info->flags & ASYNC_CLOSING)
3479 interruptible_sleep_on(&info->close_wait);
3480 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
3481 -EAGAIN : -ERESTARTSYS);
3486 page = get_zeroed_page(GFP_KERNEL);
3494 tmp_buf = (unsigned char *) page;
3497 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
3499 spin_lock_irqsave(&info->netlock, flags);
3500 if (info->netcount) {
3502 spin_unlock_irqrestore(&info->netlock, flags);
3506 spin_unlock_irqrestore(&info->netlock, flags);
3508 if (info->count == 1) {
3509 /* 1st open on this device, init hardware */
3510 retval = startup(info);
3515 retval = block_til_ready(tty, filp, info);
3517 if (debug_level >= DEBUG_LEVEL_INFO)
3518 printk("%s(%d):block_til_ready(%s) returned %d\n",
3519 __FILE__,__LINE__, info->device_name, retval);
3523 if (debug_level >= DEBUG_LEVEL_INFO)
3524 printk("%s(%d):mgsl_open(%s) success\n",
3525 __FILE__,__LINE__, info->device_name);
3530 if (tty->count == 1)
3531 info->tty = NULL; /* tty layer will release tty struct */
3538 } /* end of mgsl_open() */
3541 * /proc fs routines....
3544 static inline int line_info(char *buf, struct mgsl_struct *info)
3548 unsigned long flags;
3550 if (info->bus_type == MGSL_BUS_TYPE_PCI) {
3551 ret = sprintf(buf, "%s:PCI io:%04X irq:%d mem:%08X lcr:%08X",
3552 info->device_name, info->io_base, info->irq_level,
3553 info->phys_memory_base, info->phys_lcr_base);
3555 ret = sprintf(buf, "%s:(E)ISA io:%04X irq:%d dma:%d",
3556 info->device_name, info->io_base,
3557 info->irq_level, info->dma_level);
3560 /* output current serial signal states */
3561 spin_lock_irqsave(&info->irq_spinlock,flags);
3562 usc_get_serial_signals(info);
3563 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3567 if (info->serial_signals & SerialSignal_RTS)
3568 strcat(stat_buf, "|RTS");
3569 if (info->serial_signals & SerialSignal_CTS)
3570 strcat(stat_buf, "|CTS");
3571 if (info->serial_signals & SerialSignal_DTR)
3572 strcat(stat_buf, "|DTR");
3573 if (info->serial_signals & SerialSignal_DSR)
3574 strcat(stat_buf, "|DSR");
3575 if (info->serial_signals & SerialSignal_DCD)
3576 strcat(stat_buf, "|CD");
3577 if (info->serial_signals & SerialSignal_RI)
3578 strcat(stat_buf, "|RI");
3580 if (info->params.mode == MGSL_MODE_HDLC ||
3581 info->params.mode == MGSL_MODE_RAW ) {
3582 ret += sprintf(buf+ret, " HDLC txok:%d rxok:%d",
3583 info->icount.txok, info->icount.rxok);
3584 if (info->icount.txunder)
3585 ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
3586 if (info->icount.txabort)
3587 ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
3588 if (info->icount.rxshort)
3589 ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
3590 if (info->icount.rxlong)
3591 ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
3592 if (info->icount.rxover)
3593 ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
3594 if (info->icount.rxcrc)
3595 ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
3597 ret += sprintf(buf+ret, " ASYNC tx:%d rx:%d",
3598 info->icount.tx, info->icount.rx);
3599 if (info->icount.frame)
3600 ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
3601 if (info->icount.parity)
3602 ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
3603 if (info->icount.brk)
3604 ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
3605 if (info->icount.overrun)
3606 ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
3609 /* Append serial signal status to end */
3610 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
3612 ret += sprintf(buf+ret, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
3613 info->tx_active,info->bh_requested,info->bh_running,
3616 spin_lock_irqsave(&info->irq_spinlock,flags);
3618 u16 Tcsr = usc_InReg( info, TCSR );
3619 u16 Tdmr = usc_InDmaReg( info, TDMR );
3620 u16 Ticr = usc_InReg( info, TICR );
3621 u16 Rscr = usc_InReg( info, RCSR );
3622 u16 Rdmr = usc_InDmaReg( info, RDMR );
3623 u16 Ricr = usc_InReg( info, RICR );
3624 u16 Icr = usc_InReg( info, ICR );
3625 u16 Dccr = usc_InReg( info, DCCR );
3626 u16 Tmr = usc_InReg( info, TMR );
3627 u16 Tccr = usc_InReg( info, TCCR );
3628 u16 Ccar = inw( info->io_base + CCAR );
3629 ret += sprintf(buf+ret, "tcsr=%04X tdmr=%04X ticr=%04X rcsr=%04X rdmr=%04X\n"
3630 "ricr=%04X icr =%04X dccr=%04X tmr=%04X tccr=%04X ccar=%04X\n",
3631 Tcsr,Tdmr,Ticr,Rscr,Rdmr,Ricr,Icr,Dccr,Tmr,Tccr,Ccar );
3633 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3637 } /* end of line_info() */
3641 * Called to print information about devices
3644 * page page of memory to hold returned info
3653 static int mgsl_read_proc(char *page, char **start, off_t off, int count,
3654 int *eof, void *data)
3658 struct mgsl_struct *info;
3660 len += sprintf(page, "synclink driver:%s\n", driver_version);
3662 info = mgsl_device_list;
3664 l = line_info(page + len, info);
3666 if (len+begin > off+count)
3668 if (len+begin < off) {
3672 info = info->next_device;
3677 if (off >= len+begin)
3679 *start = page + (off-begin);
3680 return ((count < begin+len-off) ? count : begin+len-off);
3682 } /* end of mgsl_read_proc() */
3684 /* mgsl_allocate_dma_buffers()
3686 * Allocate and format DMA buffers (ISA adapter)
3687 * or format shared memory buffers (PCI adapter).
3689 * Arguments: info pointer to device instance data
3690 * Return Value: 0 if success, otherwise error
3692 static int mgsl_allocate_dma_buffers(struct mgsl_struct *info)
3694 unsigned short BuffersPerFrame;
3696 info->last_mem_alloc = 0;
3698 /* Calculate the number of DMA buffers necessary to hold the */
3699 /* largest allowable frame size. Note: If the max frame size is */
3700 /* not an even multiple of the DMA buffer size then we need to */
3701 /* round the buffer count per frame up one. */
3703 BuffersPerFrame = (unsigned short)(info->max_frame_size/DMABUFFERSIZE);
3704 if ( info->max_frame_size % DMABUFFERSIZE )
3707 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3709 * The PCI adapter has 256KBytes of shared memory to use.
3710 * This is 64 PAGE_SIZE buffers.
3712 * The first page is used for padding at this time so the
3713 * buffer list does not begin at offset 0 of the PCI
3714 * adapter's shared memory.
3716 * The 2nd page is used for the buffer list. A 4K buffer
3717 * list can hold 128 DMA_BUFFER structures at 32 bytes
3720 * This leaves 62 4K pages.
3722 * The next N pages are used for transmit frame(s). We
3723 * reserve enough 4K page blocks to hold the required
3724 * number of transmit dma buffers (num_tx_dma_buffers),
3725 * each of MaxFrameSize size.
3727 * Of the remaining pages (62-N), determine how many can
3728 * be used to receive full MaxFrameSize inbound frames
3730 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3731 info->rx_buffer_count = 62 - info->tx_buffer_count;
3733 /* Calculate the number of PAGE_SIZE buffers needed for */
3734 /* receive and transmit DMA buffers. */
3737 /* Calculate the number of DMA buffers necessary to */
3738 /* hold 7 max size receive frames and one max size transmit frame. */
3739 /* The receive buffer count is bumped by one so we avoid an */
3740 /* End of List condition if all receive buffers are used when */
3741 /* using linked list DMA buffers. */
3743 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3744 info->rx_buffer_count = (BuffersPerFrame * MAXRXFRAMES) + 6;
3747 * limit total TxBuffers & RxBuffers to 62 4K total
3748 * (ala PCI Allocation)
3751 if ( (info->tx_buffer_count + info->rx_buffer_count) > 62 )
3752 info->rx_buffer_count = 62 - info->tx_buffer_count;
3756 if ( debug_level >= DEBUG_LEVEL_INFO )
3757 printk("%s(%d):Allocating %d TX and %d RX DMA buffers.\n",
3758 __FILE__,__LINE__, info->tx_buffer_count,info->rx_buffer_count);
3760 if ( mgsl_alloc_buffer_list_memory( info ) < 0 ||
3761 mgsl_alloc_frame_memory(info, info->rx_buffer_list, info->rx_buffer_count) < 0 ||
3762 mgsl_alloc_frame_memory(info, info->tx_buffer_list, info->tx_buffer_count) < 0 ||
3763 mgsl_alloc_intermediate_rxbuffer_memory(info) < 0 ||
3764 mgsl_alloc_intermediate_txbuffer_memory(info) < 0 ) {
3765 printk("%s(%d):Can't allocate DMA buffer memory\n",__FILE__,__LINE__);
3769 mgsl_reset_rx_dma_buffers( info );
3770 mgsl_reset_tx_dma_buffers( info );
3774 } /* end of mgsl_allocate_dma_buffers() */
3777 * mgsl_alloc_buffer_list_memory()
3779 * Allocate a common DMA buffer for use as the
3780 * receive and transmit buffer lists.
3782 * A buffer list is a set of buffer entries where each entry contains
3783 * a pointer to an actual buffer and a pointer to the next buffer entry
3784 * (plus some other info about the buffer).
3786 * The buffer entries for a list are built to form a circular list so
3787 * that when the entire list has been traversed you start back at the
3790 * This function allocates memory for just the buffer entries.
3791 * The links (pointer to next entry) are filled in with the physical
3792 * address of the next entry so the adapter can navigate the list
3793 * using bus master DMA. The pointers to the actual buffers are filled
3794 * out later when the actual buffers are allocated.
3796 * Arguments: info pointer to device instance data
3797 * Return Value: 0 if success, otherwise error
3799 static int mgsl_alloc_buffer_list_memory( struct mgsl_struct *info )
3803 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3804 /* PCI adapter uses shared memory. */
3805 info->buffer_list = info->memory_base + info->last_mem_alloc;
3806 info->buffer_list_phys = info->last_mem_alloc;
3807 info->last_mem_alloc += BUFFERLISTSIZE;
3809 /* ISA adapter uses system memory. */
3810 /* The buffer lists are allocated as a common buffer that both */
3811 /* the processor and adapter can access. This allows the driver to */
3812 /* inspect portions of the buffer while other portions are being */
3813 /* updated by the adapter using Bus Master DMA. */
3815 info->buffer_list = kmalloc(BUFFERLISTSIZE, GFP_KERNEL | GFP_DMA);
3816 if ( info->buffer_list == NULL )
3819 info->buffer_list_phys = isa_virt_to_bus(info->buffer_list);
3822 /* We got the memory for the buffer entry lists. */
3823 /* Initialize the memory block to all zeros. */
3824 memset( info->buffer_list, 0, BUFFERLISTSIZE );
3826 /* Save virtual address pointers to the receive and */
3827 /* transmit buffer lists. (Receive 1st). These pointers will */
3828 /* be used by the processor to access the lists. */
3829 info->rx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3830 info->tx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3831 info->tx_buffer_list += info->rx_buffer_count;
3834 * Build the links for the buffer entry lists such that
3835 * two circular lists are built. (Transmit and Receive).
3837 * Note: the links are physical addresses
3838 * which are read by the adapter to determine the next
3839 * buffer entry to use.
3842 for ( i = 0; i < info->rx_buffer_count; i++ ) {
3843 /* calculate and store physical address of this buffer entry */
3844 info->rx_buffer_list[i].phys_entry =
3845 info->buffer_list_phys + (i * sizeof(DMABUFFERENTRY));
3847 /* calculate and store physical address of */
3848 /* next entry in cirular list of entries */
3850 info->rx_buffer_list[i].link = info->buffer_list_phys;
3852 if ( i < info->rx_buffer_count - 1 )
3853 info->rx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3856 for ( i = 0; i < info->tx_buffer_count; i++ ) {
3857 /* calculate and store physical address of this buffer entry */
3858 info->tx_buffer_list[i].phys_entry = info->buffer_list_phys +
3859 ((info->rx_buffer_count + i) * sizeof(DMABUFFERENTRY));
3861 /* calculate and store physical address of */
3862 /* next entry in cirular list of entries */
3864 info->tx_buffer_list[i].link = info->buffer_list_phys +
3865 info->rx_buffer_count * sizeof(DMABUFFERENTRY);
3867 if ( i < info->tx_buffer_count - 1 )
3868 info->tx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3873 } /* end of mgsl_alloc_buffer_list_memory() */
3875 /* Free DMA buffers allocated for use as the
3876 * receive and transmit buffer lists.
3879 * The data transfer buffers associated with the buffer list
3880 * MUST be freed before freeing the buffer list itself because
3881 * the buffer list contains the information necessary to free
3882 * the individual buffers!
3884 static void mgsl_free_buffer_list_memory( struct mgsl_struct *info )
3886 if ( info->buffer_list && info->bus_type != MGSL_BUS_TYPE_PCI )
3887 kfree(info->buffer_list);
3889 info->buffer_list = NULL;
3890 info->rx_buffer_list = NULL;
3891 info->tx_buffer_list = NULL;
3893 } /* end of mgsl_free_buffer_list_memory() */
3896 * mgsl_alloc_frame_memory()
3898 * Allocate the frame DMA buffers used by the specified buffer list.
3899 * Each DMA buffer will be one memory page in size. This is necessary
3900 * because memory can fragment enough that it may be impossible
3905 * info pointer to device instance data
3906 * BufferList pointer to list of buffer entries
3907 * Buffercount count of buffer entries in buffer list
3909 * Return Value: 0 if success, otherwise -ENOMEM
3911 static int mgsl_alloc_frame_memory(struct mgsl_struct *info,DMABUFFERENTRY *BufferList,int Buffercount)
3914 unsigned long phys_addr;
3916 /* Allocate page sized buffers for the receive buffer list */
3918 for ( i = 0; i < Buffercount; i++ ) {
3919 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3920 /* PCI adapter uses shared memory buffers. */
3921 BufferList[i].virt_addr = info->memory_base + info->last_mem_alloc;
3922 phys_addr = info->last_mem_alloc;
3923 info->last_mem_alloc += DMABUFFERSIZE;
3925 /* ISA adapter uses system memory. */
3926 BufferList[i].virt_addr =
3927 kmalloc(DMABUFFERSIZE, GFP_KERNEL | GFP_DMA);
3928 if ( BufferList[i].virt_addr == NULL )
3930 phys_addr = isa_virt_to_bus(BufferList[i].virt_addr);
3932 BufferList[i].phys_addr = phys_addr;
3937 } /* end of mgsl_alloc_frame_memory() */
3940 * mgsl_free_frame_memory()
3942 * Free the buffers associated with
3943 * each buffer entry of a buffer list.
3947 * info pointer to device instance data
3948 * BufferList pointer to list of buffer entries
3949 * Buffercount count of buffer entries in buffer list
3951 * Return Value: None
3953 static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList, int Buffercount)
3958 for ( i = 0 ; i < Buffercount ; i++ ) {
3959 if ( BufferList[i].virt_addr ) {
3960 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
3961 kfree(BufferList[i].virt_addr);
3962 BufferList[i].virt_addr = NULL;
3967 } /* end of mgsl_free_frame_memory() */
3969 /* mgsl_free_dma_buffers()
3973 * Arguments: info pointer to device instance data
3974 * Return Value: None
3976 static void mgsl_free_dma_buffers( struct mgsl_struct *info )
3978 mgsl_free_frame_memory( info, info->rx_buffer_list, info->rx_buffer_count );
3979 mgsl_free_frame_memory( info, info->tx_buffer_list, info->tx_buffer_count );
3980 mgsl_free_buffer_list_memory( info );
3982 } /* end of mgsl_free_dma_buffers() */
3986 * mgsl_alloc_intermediate_rxbuffer_memory()
3988 * Allocate a buffer large enough to hold max_frame_size. This buffer
3989 * is used to pass an assembled frame to the line discipline.
3993 * info pointer to device instance data
3995 * Return Value: 0 if success, otherwise -ENOMEM
3997 static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info)
3999 info->intermediate_rxbuffer = kmalloc(info->max_frame_size, GFP_KERNEL | GFP_DMA);
4000 if ( info->intermediate_rxbuffer == NULL )
4005 } /* end of mgsl_alloc_intermediate_rxbuffer_memory() */
4008 * mgsl_free_intermediate_rxbuffer_memory()
4013 * info pointer to device instance data
4015 * Return Value: None
4017 static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info)
4019 kfree(info->intermediate_rxbuffer);
4020 info->intermediate_rxbuffer = NULL;
4022 } /* end of mgsl_free_intermediate_rxbuffer_memory() */
4025 * mgsl_alloc_intermediate_txbuffer_memory()
4027 * Allocate intermdiate transmit buffer(s) large enough to hold max_frame_size.
4028 * This buffer is used to load transmit frames into the adapter's dma transfer
4029 * buffers when there is sufficient space.
4033 * info pointer to device instance data
4035 * Return Value: 0 if success, otherwise -ENOMEM
4037 static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info)
4041 if ( debug_level >= DEBUG_LEVEL_INFO )
4042 printk("%s %s(%d) allocating %d tx holding buffers\n",
4043 info->device_name, __FILE__,__LINE__,info->num_tx_holding_buffers);
4045 memset(info->tx_holding_buffers,0,sizeof(info->tx_holding_buffers));
4047 for ( i=0; i<info->num_tx_holding_buffers; ++i) {
4048 info->tx_holding_buffers[i].buffer =
4049 kmalloc(info->max_frame_size, GFP_KERNEL);
4050 if ( info->tx_holding_buffers[i].buffer == NULL )
4056 } /* end of mgsl_alloc_intermediate_txbuffer_memory() */
4059 * mgsl_free_intermediate_txbuffer_memory()
4064 * info pointer to device instance data
4066 * Return Value: None
4068 static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info)
4072 for ( i=0; i<info->num_tx_holding_buffers; ++i ) {
4073 kfree(info->tx_holding_buffers[i].buffer);
4074 info->tx_holding_buffers[i].buffer = NULL;
4077 info->get_tx_holding_index = 0;
4078 info->put_tx_holding_index = 0;
4079 info->tx_holding_count = 0;
4081 } /* end of mgsl_free_intermediate_txbuffer_memory() */
4085 * load_next_tx_holding_buffer()
4087 * attempts to load the next buffered tx request into the
4092 * info pointer to device instance data
4094 * Return Value: 1 if next buffered tx request loaded
4095 * into adapter's tx dma buffer,
4098 static int load_next_tx_holding_buffer(struct mgsl_struct *info)
4102 if ( info->tx_holding_count ) {
4103 /* determine if we have enough tx dma buffers
4104 * to accommodate the next tx frame
4106 struct tx_holding_buffer *ptx =
4107 &info->tx_holding_buffers[info->get_tx_holding_index];
4108 int num_free = num_free_tx_dma_buffers(info);
4109 int num_needed = ptx->buffer_size / DMABUFFERSIZE;
4110 if ( ptx->buffer_size % DMABUFFERSIZE )
4113 if (num_needed <= num_free) {
4114 info->xmit_cnt = ptx->buffer_size;
4115 mgsl_load_tx_dma_buffer(info,ptx->buffer,ptx->buffer_size);
4117 --info->tx_holding_count;
4118 if ( ++info->get_tx_holding_index >= info->num_tx_holding_buffers)
4119 info->get_tx_holding_index=0;
4121 /* restart transmit timer */
4122 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(5000));
4132 * save_tx_buffer_request()
4134 * attempt to store transmit frame request for later transmission
4138 * info pointer to device instance data
4139 * Buffer pointer to buffer containing frame to load
4140 * BufferSize size in bytes of frame in Buffer
4142 * Return Value: 1 if able to store, 0 otherwise
4144 static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize)
4146 struct tx_holding_buffer *ptx;
4148 if ( info->tx_holding_count >= info->num_tx_holding_buffers ) {
4149 return 0; /* all buffers in use */
4152 ptx = &info->tx_holding_buffers[info->put_tx_holding_index];
4153 ptx->buffer_size = BufferSize;
4154 memcpy( ptx->buffer, Buffer, BufferSize);
4156 ++info->tx_holding_count;
4157 if ( ++info->put_tx_holding_index >= info->num_tx_holding_buffers)
4158 info->put_tx_holding_index=0;
4163 static int mgsl_claim_resources(struct mgsl_struct *info)
4165 if (request_region(info->io_base,info->io_addr_size,"synclink") == NULL) {
4166 printk( "%s(%d):I/O address conflict on device %s Addr=%08X\n",
4167 __FILE__,__LINE__,info->device_name, info->io_base);
4170 info->io_addr_requested = 1;
4172 if ( request_irq(info->irq_level,mgsl_interrupt,info->irq_flags,
4173 info->device_name, info ) < 0 ) {
4174 printk( "%s(%d):Cant request interrupt on device %s IRQ=%d\n",
4175 __FILE__,__LINE__,info->device_name, info->irq_level );
4178 info->irq_requested = 1;
4180 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4181 if (request_mem_region(info->phys_memory_base,0x40000,"synclink") == NULL) {
4182 printk( "%s(%d):mem addr conflict device %s Addr=%08X\n",
4183 __FILE__,__LINE__,info->device_name, info->phys_memory_base);
4186 info->shared_mem_requested = 1;
4187 if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclink") == NULL) {
4188 printk( "%s(%d):lcr mem addr conflict device %s Addr=%08X\n",
4189 __FILE__,__LINE__,info->device_name, info->phys_lcr_base + info->lcr_offset);
4192 info->lcr_mem_requested = 1;
4194 info->memory_base = ioremap(info->phys_memory_base,0x40000);
4195 if (!info->memory_base) {
4196 printk( "%s(%d):Cant map shared memory on device %s MemAddr=%08X\n",
4197 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4201 if ( !mgsl_memory_test(info) ) {
4202 printk( "%s(%d):Failed shared memory test %s MemAddr=%08X\n",
4203 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4207 info->lcr_base = ioremap(info->phys_lcr_base,PAGE_SIZE) + info->lcr_offset;
4208 if (!info->lcr_base) {
4209 printk( "%s(%d):Cant map LCR memory on device %s MemAddr=%08X\n",
4210 __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
4215 /* claim DMA channel */
4217 if (request_dma(info->dma_level,info->device_name) < 0){
4218 printk( "%s(%d):Cant request DMA channel on device %s DMA=%d\n",
4219 __FILE__,__LINE__,info->device_name, info->dma_level );
4220 mgsl_release_resources( info );
4223 info->dma_requested = 1;
4225 /* ISA adapter uses bus master DMA */
4226 set_dma_mode(info->dma_level,DMA_MODE_CASCADE);
4227 enable_dma(info->dma_level);
4230 if ( mgsl_allocate_dma_buffers(info) < 0 ) {
4231 printk( "%s(%d):Cant allocate DMA buffers on device %s DMA=%d\n",
4232 __FILE__,__LINE__,info->device_name, info->dma_level );
4238 mgsl_release_resources(info);
4241 } /* end of mgsl_claim_resources() */
4243 static void mgsl_release_resources(struct mgsl_struct *info)
4245 if ( debug_level >= DEBUG_LEVEL_INFO )
4246 printk( "%s(%d):mgsl_release_resources(%s) entry\n",
4247 __FILE__,__LINE__,info->device_name );
4249 if ( info->irq_requested ) {
4250 free_irq(info->irq_level, info);
4251 info->irq_requested = 0;
4253 if ( info->dma_requested ) {
4254 disable_dma(info->dma_level);
4255 free_dma(info->dma_level);
4256 info->dma_requested = 0;
4258 mgsl_free_dma_buffers(info);
4259 mgsl_free_intermediate_rxbuffer_memory(info);
4260 mgsl_free_intermediate_txbuffer_memory(info);
4262 if ( info->io_addr_requested ) {
4263 release_region(info->io_base,info->io_addr_size);
4264 info->io_addr_requested = 0;
4266 if ( info->shared_mem_requested ) {
4267 release_mem_region(info->phys_memory_base,0x40000);
4268 info->shared_mem_requested = 0;
4270 if ( info->lcr_mem_requested ) {
4271 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
4272 info->lcr_mem_requested = 0;
4274 if (info->memory_base){
4275 iounmap(info->memory_base);
4276 info->memory_base = NULL;
4278 if (info->lcr_base){
4279 iounmap(info->lcr_base - info->lcr_offset);
4280 info->lcr_base = NULL;
4283 if ( debug_level >= DEBUG_LEVEL_INFO )
4284 printk( "%s(%d):mgsl_release_resources(%s) exit\n",
4285 __FILE__,__LINE__,info->device_name );
4287 } /* end of mgsl_release_resources() */
4289 /* mgsl_add_device()
4291 * Add the specified device instance data structure to the
4292 * global linked list of devices and increment the device count.
4294 * Arguments: info pointer to device instance data
4295 * Return Value: None
4297 static void mgsl_add_device( struct mgsl_struct *info )
4299 info->next_device = NULL;
4300 info->line = mgsl_device_count;
4301 sprintf(info->device_name,"ttySL%d",info->line);
4303 if (info->line < MAX_TOTAL_DEVICES) {
4304 if (maxframe[info->line])
4305 info->max_frame_size = maxframe[info->line];
4306 info->dosyncppp = dosyncppp[info->line];
4308 if (txdmabufs[info->line]) {
4309 info->num_tx_dma_buffers = txdmabufs[info->line];
4310 if (info->num_tx_dma_buffers < 1)
4311 info->num_tx_dma_buffers = 1;
4314 if (txholdbufs[info->line]) {
4315 info->num_tx_holding_buffers = txholdbufs[info->line];
4316 if (info->num_tx_holding_buffers < 1)
4317 info->num_tx_holding_buffers = 1;
4318 else if (info->num_tx_holding_buffers > MAX_TX_HOLDING_BUFFERS)
4319 info->num_tx_holding_buffers = MAX_TX_HOLDING_BUFFERS;
4323 mgsl_device_count++;
4325 if ( !mgsl_device_list )
4326 mgsl_device_list = info;
4328 struct mgsl_struct *current_dev = mgsl_device_list;
4329 while( current_dev->next_device )
4330 current_dev = current_dev->next_device;
4331 current_dev->next_device = info;
4334 if ( info->max_frame_size < 4096 )
4335 info->max_frame_size = 4096;
4336 else if ( info->max_frame_size > 65535 )
4337 info->max_frame_size = 65535;
4339 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4340 printk( "SyncLink PCI v%d %s: IO=%04X IRQ=%d Mem=%08X,%08X MaxFrameSize=%u\n",
4341 info->hw_version + 1, info->device_name, info->io_base, info->irq_level,
4342 info->phys_memory_base, info->phys_lcr_base,
4343 info->max_frame_size );
4345 printk( "SyncLink ISA %s: IO=%04X IRQ=%d DMA=%d MaxFrameSize=%u\n",
4346 info->device_name, info->io_base, info->irq_level, info->dma_level,
4347 info->max_frame_size );
4354 } /* end of mgsl_add_device() */
4356 /* mgsl_allocate_device()
4358 * Allocate and initialize a device instance structure
4361 * Return Value: pointer to mgsl_struct if success, otherwise NULL
4363 static struct mgsl_struct* mgsl_allocate_device(void)
4365 struct mgsl_struct *info;
4367 info = (struct mgsl_struct *)kmalloc(sizeof(struct mgsl_struct),
4371 printk("Error can't allocate device instance data\n");
4373 memset(info, 0, sizeof(struct mgsl_struct));
4374 info->magic = MGSL_MAGIC;
4375 INIT_WORK(&info->task, mgsl_bh_handler, info);
4376 info->max_frame_size = 4096;
4377 info->close_delay = 5*HZ/10;
4378 info->closing_wait = 30*HZ;
4379 init_waitqueue_head(&info->open_wait);
4380 init_waitqueue_head(&info->close_wait);
4381 init_waitqueue_head(&info->status_event_wait_q);
4382 init_waitqueue_head(&info->event_wait_q);
4383 spin_lock_init(&info->irq_spinlock);
4384 spin_lock_init(&info->netlock);
4385 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
4386 info->idle_mode = HDLC_TXIDLE_FLAGS;
4387 info->num_tx_dma_buffers = 1;
4388 info->num_tx_holding_buffers = 0;
4393 } /* end of mgsl_allocate_device()*/
4395 static struct tty_operations mgsl_ops = {
4397 .close = mgsl_close,
4398 .write = mgsl_write,
4399 .put_char = mgsl_put_char,
4400 .flush_chars = mgsl_flush_chars,
4401 .write_room = mgsl_write_room,
4402 .chars_in_buffer = mgsl_chars_in_buffer,
4403 .flush_buffer = mgsl_flush_buffer,
4404 .ioctl = mgsl_ioctl,
4405 .throttle = mgsl_throttle,
4406 .unthrottle = mgsl_unthrottle,
4407 .send_xchar = mgsl_send_xchar,
4408 .break_ctl = mgsl_break,
4409 .wait_until_sent = mgsl_wait_until_sent,
4410 .read_proc = mgsl_read_proc,
4411 .set_termios = mgsl_set_termios,
4413 .start = mgsl_start,
4414 .hangup = mgsl_hangup,
4415 .tiocmget = tiocmget,
4416 .tiocmset = tiocmset,
4420 * perform tty device initialization
4422 static int mgsl_init_tty(void)
4426 serial_driver = alloc_tty_driver(128);
4430 serial_driver->owner = THIS_MODULE;
4431 serial_driver->driver_name = "synclink";
4432 serial_driver->name = "ttySL";
4433 serial_driver->major = ttymajor;
4434 serial_driver->minor_start = 64;
4435 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4436 serial_driver->subtype = SERIAL_TYPE_NORMAL;
4437 serial_driver->init_termios = tty_std_termios;
4438 serial_driver->init_termios.c_cflag =
4439 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4440 serial_driver->flags = TTY_DRIVER_REAL_RAW;
4441 tty_set_operations(serial_driver, &mgsl_ops);
4442 if ((rc = tty_register_driver(serial_driver)) < 0) {
4443 printk("%s(%d):Couldn't register serial driver\n",
4445 put_tty_driver(serial_driver);
4446 serial_driver = NULL;
4450 printk("%s %s, tty major#%d\n",
4451 driver_name, driver_version,
4452 serial_driver->major);
4456 /* enumerate user specified ISA adapters
4458 static void mgsl_enum_isa_devices(void)
4460 struct mgsl_struct *info;
4463 /* Check for user specified ISA devices */
4465 for (i=0 ;(i < MAX_ISA_DEVICES) && io[i] && irq[i]; i++){
4466 if ( debug_level >= DEBUG_LEVEL_INFO )
4467 printk("ISA device specified io=%04X,irq=%d,dma=%d\n",
4468 io[i], irq[i], dma[i] );
4470 info = mgsl_allocate_device();
4472 /* error allocating device instance data */
4473 if ( debug_level >= DEBUG_LEVEL_ERROR )
4474 printk( "can't allocate device instance data.\n");
4478 /* Copy user configuration info to device instance data */
4479 info->io_base = (unsigned int)io[i];
4480 info->irq_level = (unsigned int)irq[i];
4481 info->irq_level = irq_canonicalize(info->irq_level);
4482 info->dma_level = (unsigned int)dma[i];
4483 info->bus_type = MGSL_BUS_TYPE_ISA;
4484 info->io_addr_size = 16;
4485 info->irq_flags = 0;
4487 mgsl_add_device( info );
4491 static void synclink_cleanup(void)
4494 struct mgsl_struct *info;
4495 struct mgsl_struct *tmp;
4497 printk("Unloading %s: %s\n", driver_name, driver_version);
4499 if (serial_driver) {
4500 if ((rc = tty_unregister_driver(serial_driver)))
4501 printk("%s(%d) failed to unregister tty driver err=%d\n",
4502 __FILE__,__LINE__,rc);
4503 put_tty_driver(serial_driver);
4506 info = mgsl_device_list;
4511 mgsl_release_resources(info);
4513 info = info->next_device;
4518 free_page((unsigned long) tmp_buf);
4523 pci_unregister_driver(&synclink_pci_driver);
4526 static int __init synclink_init(void)
4530 if (break_on_load) {
4531 mgsl_get_text_ptr();
4535 printk("%s %s\n", driver_name, driver_version);
4537 mgsl_enum_isa_devices();
4538 if ((rc = pci_register_driver(&synclink_pci_driver)) < 0)
4539 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
4543 if ((rc = mgsl_init_tty()) < 0)
4553 static void __exit synclink_exit(void)
4558 module_init(synclink_init);
4559 module_exit(synclink_exit);
4564 * Issue a USC Receive/Transmit command to the
4565 * Channel Command/Address Register (CCAR).
4569 * The command is encoded in the most significant 5 bits <15..11>
4570 * of the CCAR value. Bits <10..7> of the CCAR must be preserved
4571 * and Bits <6..0> must be written as zeros.
4575 * info pointer to device information structure
4576 * Cmd command mask (use symbolic macros)
4582 static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd )
4584 /* output command to CCAR in bits <15..11> */
4585 /* preserve bits <10..7>, bits <6..0> must be zero */
4587 outw( Cmd + info->loopback_bits, info->io_base + CCAR );
4589 /* Read to flush write to CCAR */
4590 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4591 inw( info->io_base + CCAR );
4593 } /* end of usc_RTCmd() */
4598 * Issue a DMA command to the DMA Command/Address Register (DCAR).
4602 * info pointer to device information structure
4603 * Cmd DMA command mask (usc_DmaCmd_XX Macros)
4609 static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd )
4611 /* write command mask to DCAR */
4612 outw( Cmd + info->mbre_bit, info->io_base );
4614 /* Read to flush write to DCAR */
4615 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4616 inw( info->io_base );
4618 } /* end of usc_DmaCmd() */
4623 * Write a 16-bit value to a USC DMA register
4627 * info pointer to device info structure
4628 * RegAddr register address (number) for write
4629 * RegValue 16-bit value to write to register
4636 static void usc_OutDmaReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4638 /* Note: The DCAR is located at the adapter base address */
4639 /* Note: must preserve state of BIT8 in DCAR */
4641 outw( RegAddr + info->mbre_bit, info->io_base );
4642 outw( RegValue, info->io_base );
4644 /* Read to flush write to DCAR */
4645 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4646 inw( info->io_base );
4648 } /* end of usc_OutDmaReg() */
4653 * Read a 16-bit value from a DMA register
4657 * info pointer to device info structure
4658 * RegAddr register address (number) to read from
4662 * The 16-bit value read from register
4665 static u16 usc_InDmaReg( struct mgsl_struct *info, u16 RegAddr )
4667 /* Note: The DCAR is located at the adapter base address */
4668 /* Note: must preserve state of BIT8 in DCAR */
4670 outw( RegAddr + info->mbre_bit, info->io_base );
4671 return inw( info->io_base );
4673 } /* end of usc_InDmaReg() */
4679 * Write a 16-bit value to a USC serial channel register
4683 * info pointer to device info structure
4684 * RegAddr register address (number) to write to
4685 * RegValue 16-bit value to write to register
4692 static void usc_OutReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4694 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4695 outw( RegValue, info->io_base + CCAR );
4697 /* Read to flush write to CCAR */
4698 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4699 inw( info->io_base + CCAR );
4701 } /* end of usc_OutReg() */
4706 * Reads a 16-bit value from a USC serial channel register
4710 * info pointer to device extension
4711 * RegAddr register address (number) to read from
4715 * 16-bit value read from register
4717 static u16 usc_InReg( struct mgsl_struct *info, u16 RegAddr )
4719 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4720 return inw( info->io_base + CCAR );
4722 } /* end of usc_InReg() */
4724 /* usc_set_sdlc_mode()
4726 * Set up the adapter for SDLC DMA communications.
4728 * Arguments: info pointer to device instance data
4729 * Return Value: NONE
4731 static void usc_set_sdlc_mode( struct mgsl_struct *info )
4737 * determine if the IUSC on the adapter is pre-SL1660. If
4738 * not, take advantage of the UnderWait feature of more
4739 * modern chips. If an underrun occurs and this bit is set,
4740 * the transmitter will idle the programmed idle pattern
4741 * until the driver has time to service the underrun. Otherwise,
4742 * the dma controller may get the cycles previously requested
4743 * and begin transmitting queued tx data.
4745 usc_OutReg(info,TMCR,0x1f);
4746 RegValue=usc_InReg(info,TMDR);
4747 if ( RegValue == IUSC_PRE_SL1660 )
4753 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
4756 ** Channel Mode Register (CMR)
4758 ** <15..14> 10 Tx Sub Modes, Send Flag on Underrun
4759 ** <13> 0 0 = Transmit Disabled (initially)
4760 ** <12> 0 1 = Consecutive Idles share common 0
4761 ** <11..8> 1110 Transmitter Mode = HDLC/SDLC Loop
4762 ** <7..4> 0000 Rx Sub Modes, addr/ctrl field handling
4763 ** <3..0> 0110 Receiver Mode = HDLC/SDLC
4765 ** 1000 1110 0000 0110 = 0x8e06
4769 /*--------------------------------------------------
4770 * ignore user options for UnderRun Actions and
4772 *--------------------------------------------------*/
4776 /* Channel mode Register (CMR)
4778 * <15..14> 00 Tx Sub modes, Underrun Action
4779 * <13> 0 1 = Send Preamble before opening flag
4780 * <12> 0 1 = Consecutive Idles share common 0
4781 * <11..8> 0110 Transmitter mode = HDLC/SDLC
4782 * <7..4> 0000 Rx Sub modes, addr/ctrl field handling
4783 * <3..0> 0110 Receiver mode = HDLC/SDLC
4785 * 0000 0110 0000 0110 = 0x0606
4787 if (info->params.mode == MGSL_MODE_RAW) {
4788 RegValue = 0x0001; /* Set Receive mode = external sync */
4790 usc_OutReg( info, IOCR, /* Set IOCR DCD is RxSync Detect Input */
4791 (unsigned short)((usc_InReg(info, IOCR) & ~(BIT13|BIT12)) | BIT12));
4795 * CMR <15> 0 Don't send CRC on Tx Underrun
4796 * CMR <14> x undefined
4797 * CMR <13> 0 Send preamble before openning sync
4798 * CMR <12> 0 Send 8-bit syncs, 1=send Syncs per TxLength
4801 * CMR <11-8) 0100 MonoSync
4803 * 0x00 0100 xxxx xxxx 04xx
4811 if ( info->params.flags & HDLC_FLAG_UNDERRUN_ABORT15 )
4813 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_FLAG )
4815 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_CRC )
4816 RegValue |= BIT15 + BIT14;
4819 if ( info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE )
4823 if ( info->params.mode == MGSL_MODE_HDLC &&
4824 (info->params.flags & HDLC_FLAG_SHARE_ZERO) )
4827 if ( info->params.addr_filter != 0xff )
4829 /* set up receive address filtering */
4830 usc_OutReg( info, RSR, info->params.addr_filter );
4834 usc_OutReg( info, CMR, RegValue );
4835 info->cmr_value = RegValue;
4837 /* Receiver mode Register (RMR)
4839 * <15..13> 000 encoding
4840 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4841 * <10> 1 1 = Set CRC to all 1s (use for SDLC/HDLC)
4842 * <9> 0 1 = Include Receive chars in CRC
4843 * <8> 1 1 = Use Abort/PE bit as abort indicator
4844 * <7..6> 00 Even parity
4845 * <5> 0 parity disabled
4846 * <4..2> 000 Receive Char Length = 8 bits
4847 * <1..0> 00 Disable Receiver
4849 * 0000 0101 0000 0000 = 0x0500
4854 switch ( info->params.encoding ) {
4855 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4856 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4857 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4858 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4859 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4860 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4861 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4864 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4866 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4867 RegValue |= ( BIT12 | BIT10 | BIT9 );
4869 usc_OutReg( info, RMR, RegValue );
4871 /* Set the Receive count Limit Register (RCLR) to 0xffff. */
4872 /* When an opening flag of an SDLC frame is recognized the */
4873 /* Receive Character count (RCC) is loaded with the value in */
4874 /* RCLR. The RCC is decremented for each received byte. The */
4875 /* value of RCC is stored after the closing flag of the frame */
4876 /* allowing the frame size to be computed. */
4878 usc_OutReg( info, RCLR, RCLRVALUE );
4880 usc_RCmd( info, RCmd_SelectRicrdma_level );
4882 /* Receive Interrupt Control Register (RICR)
4884 * <15..8> ? RxFIFO DMA Request Level
4885 * <7> 0 Exited Hunt IA (Interrupt Arm)
4886 * <6> 0 Idle Received IA
4887 * <5> 0 Break/Abort IA
4889 * <3> 1 Queued status reflects oldest 2 bytes in FIFO
4891 * <1> 1 Rx Overrun IA
4892 * <0> 0 Select TC0 value for readback
4894 * 0000 0000 0000 1000 = 0x000a
4897 /* Carry over the Exit Hunt and Idle Received bits */
4898 /* in case they have been armed by usc_ArmEvents. */
4900 RegValue = usc_InReg( info, RICR ) & 0xc0;
4902 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4903 usc_OutReg( info, RICR, (u16)(0x030a | RegValue) );
4905 usc_OutReg( info, RICR, (u16)(0x140a | RegValue) );
4907 /* Unlatch all Rx status bits and clear Rx status IRQ Pending */
4909 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
4910 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
4912 /* Transmit mode Register (TMR)
4914 * <15..13> 000 encoding
4915 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4916 * <10> 1 1 = Start CRC as all 1s (use for SDLC/HDLC)
4917 * <9> 0 1 = Tx CRC Enabled
4918 * <8> 0 1 = Append CRC to end of transmit frame
4919 * <7..6> 00 Transmit parity Even
4920 * <5> 0 Transmit parity Disabled
4921 * <4..2> 000 Tx Char Length = 8 bits
4922 * <1..0> 00 Disable Transmitter
4924 * 0000 0100 0000 0000 = 0x0400
4929 switch ( info->params.encoding ) {
4930 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4931 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4932 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4933 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4934 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4935 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4936 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4939 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4940 RegValue |= BIT9 + BIT8;
4941 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4942 RegValue |= ( BIT12 | BIT10 | BIT9 | BIT8);
4944 usc_OutReg( info, TMR, RegValue );
4946 usc_set_txidle( info );
4949 usc_TCmd( info, TCmd_SelectTicrdma_level );
4951 /* Transmit Interrupt Control Register (TICR)
4953 * <15..8> ? Transmit FIFO DMA Level
4954 * <7> 0 Present IA (Interrupt Arm)
4955 * <6> 0 Idle Sent IA
4956 * <5> 1 Abort Sent IA
4957 * <4> 1 EOF/EOM Sent IA
4959 * <2> 1 1 = Wait for SW Trigger to Start Frame
4960 * <1> 1 Tx Underrun IA
4961 * <0> 0 TC0 constant on read back
4963 * 0000 0000 0011 0110 = 0x0036
4966 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4967 usc_OutReg( info, TICR, 0x0736 );
4969 usc_OutReg( info, TICR, 0x1436 );
4971 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
4972 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
4975 ** Transmit Command/Status Register (TCSR)
4977 ** <15..12> 0000 TCmd
4978 ** <11> 0/1 UnderWait
4979 ** <10..08> 000 TxIdle
4983 ** <4> x EOF/EOM Sent
4989 ** 0000 0000 0000 0000 = 0x0000
4991 info->tcsr_value = 0;
4994 info->tcsr_value |= TCSR_UNDERWAIT;
4996 usc_OutReg( info, TCSR, info->tcsr_value );
4998 /* Clock mode Control Register (CMCR)
5000 * <15..14> 00 counter 1 Source = Disabled
5001 * <13..12> 00 counter 0 Source = Disabled
5002 * <11..10> 11 BRG1 Input is TxC Pin
5003 * <9..8> 11 BRG0 Input is TxC Pin
5004 * <7..6> 01 DPLL Input is BRG1 Output
5005 * <5..3> XXX TxCLK comes from Port 0
5006 * <2..0> XXX RxCLK comes from Port 1
5008 * 0000 1111 0111 0111 = 0x0f77
5013 if ( info->params.flags & HDLC_FLAG_RXC_DPLL )
5014 RegValue |= 0x0003; /* RxCLK from DPLL */
5015 else if ( info->params.flags & HDLC_FLAG_RXC_BRG )
5016 RegValue |= 0x0004; /* RxCLK from BRG0 */
5017 else if ( info->params.flags & HDLC_FLAG_RXC_TXCPIN)
5018 RegValue |= 0x0006; /* RxCLK from TXC Input */
5020 RegValue |= 0x0007; /* RxCLK from Port1 */
5022 if ( info->params.flags & HDLC_FLAG_TXC_DPLL )
5023 RegValue |= 0x0018; /* TxCLK from DPLL */
5024 else if ( info->params.flags & HDLC_FLAG_TXC_BRG )
5025 RegValue |= 0x0020; /* TxCLK from BRG0 */
5026 else if ( info->params.flags & HDLC_FLAG_TXC_RXCPIN)
5027 RegValue |= 0x0038; /* RxCLK from TXC Input */
5029 RegValue |= 0x0030; /* TxCLK from Port0 */
5031 usc_OutReg( info, CMCR, RegValue );
5034 /* Hardware Configuration Register (HCR)
5036 * <15..14> 00 CTR0 Divisor:00=32,01=16,10=8,11=4
5037 * <13> 0 CTR1DSel:0=CTR0Div determines CTR0Div
5038 * <12> 0 CVOK:0=report code violation in biphase
5039 * <11..10> 00 DPLL Divisor:00=32,01=16,10=8,11=4
5040 * <9..8> XX DPLL mode:00=disable,01=NRZ,10=Biphase,11=Biphase Level
5041 * <7..6> 00 reserved
5042 * <5> 0 BRG1 mode:0=continuous,1=single cycle
5044 * <3..2> 00 reserved
5045 * <1> 0 BRG0 mode:0=continuous,1=single cycle
5051 if ( info->params.flags & (HDLC_FLAG_RXC_DPLL + HDLC_FLAG_TXC_DPLL) ) {
5056 /* DPLL is enabled. Use BRG1 to provide continuous reference clock */
5057 /* for DPLL. DPLL mode in HCR is dependent on the encoding used. */
5059 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
5060 XtalSpeed = 11059200;
5062 XtalSpeed = 14745600;
5064 if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
5068 else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
5075 /* Tc = (Xtal/Speed) - 1 */
5076 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
5077 /* then rounding up gives a more precise time constant. Instead */
5078 /* of rounding up and then subtracting 1 we just don't subtract */
5079 /* the one in this case. */
5081 /*--------------------------------------------------
5082 * ejz: for DPLL mode, application should use the
5083 * same clock speed as the partner system, even
5084 * though clocking is derived from the input RxData.
5085 * In case the user uses a 0 for the clock speed,
5086 * default to 0xffffffff and don't try to divide by
5088 *--------------------------------------------------*/
5089 if ( info->params.clock_speed )
5091 Tc = (u16)((XtalSpeed/DpllDivisor)/info->params.clock_speed);
5092 if ( !((((XtalSpeed/DpllDivisor) % info->params.clock_speed) * 2)
5093 / info->params.clock_speed) )
5100 /* Write 16-bit Time Constant for BRG1 */
5101 usc_OutReg( info, TC1R, Tc );
5103 RegValue |= BIT4; /* enable BRG1 */
5105 switch ( info->params.encoding ) {
5106 case HDLC_ENCODING_NRZ:
5107 case HDLC_ENCODING_NRZB:
5108 case HDLC_ENCODING_NRZI_MARK:
5109 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT8; break;
5110 case HDLC_ENCODING_BIPHASE_MARK:
5111 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT9; break;
5112 case HDLC_ENCODING_BIPHASE_LEVEL:
5113 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT9 + BIT8; break;
5117 usc_OutReg( info, HCR, RegValue );
5120 /* Channel Control/status Register (CCSR)
5122 * <15> X RCC FIFO Overflow status (RO)
5123 * <14> X RCC FIFO Not Empty status (RO)
5124 * <13> 0 1 = Clear RCC FIFO (WO)
5125 * <12> X DPLL Sync (RW)
5126 * <11> X DPLL 2 Missed Clocks status (RO)
5127 * <10> X DPLL 1 Missed Clock status (RO)
5128 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
5129 * <7> X SDLC Loop On status (RO)
5130 * <6> X SDLC Loop Send status (RO)
5131 * <5> 1 Bypass counters for TxClk and RxClk (RW)
5132 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
5133 * <1..0> 00 reserved
5135 * 0000 0000 0010 0000 = 0x0020
5138 usc_OutReg( info, CCSR, 0x1020 );
5141 if ( info->params.flags & HDLC_FLAG_AUTO_CTS ) {
5142 usc_OutReg( info, SICR,
5143 (u16)(usc_InReg(info,SICR) | SICR_CTS_INACTIVE) );
5147 /* enable Master Interrupt Enable bit (MIE) */
5148 usc_EnableMasterIrqBit( info );
5150 usc_ClearIrqPendingBits( info, RECEIVE_STATUS + RECEIVE_DATA +
5151 TRANSMIT_STATUS + TRANSMIT_DATA + MISC);
5153 /* arm RCC underflow interrupt */
5154 usc_OutReg(info, SICR, (u16)(usc_InReg(info,SICR) | BIT3));
5155 usc_EnableInterrupts(info, MISC);
5158 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5159 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5160 info->mbre_bit = BIT8;
5161 outw( BIT8, info->io_base ); /* set Master Bus Enable (DCAR) */
5163 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
5164 /* Enable DMAEN (Port 7, Bit 14) */
5165 /* This connects the DMA request signal to the ISA bus */
5166 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) & ~BIT14));
5169 /* DMA Control Register (DCR)
5171 * <15..14> 10 Priority mode = Alternating Tx/Rx
5172 * 01 Rx has priority
5173 * 00 Tx has priority
5175 * <13> 1 Enable Priority Preempt per DCR<15..14>
5176 * (WARNING DCR<11..10> must be 00 when this is 1)
5177 * 0 Choose activate channel per DCR<11..10>
5179 * <12> 0 Little Endian for Array/List
5180 * <11..10> 00 Both Channels can use each bus grant
5181 * <9..6> 0000 reserved
5182 * <5> 0 7 CLK - Minimum Bus Re-request Interval
5183 * <4> 0 1 = drive D/C and S/D pins
5184 * <3> 1 1 = Add one wait state to all DMA cycles.
5185 * <2> 0 1 = Strobe /UAS on every transfer.
5186 * <1..0> 11 Addr incrementing only affects LS24 bits
5188 * 0110 0000 0000 1011 = 0x600b
5191 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5192 /* PCI adapter does not need DMA wait state */
5193 usc_OutDmaReg( info, DCR, 0xa00b );
5196 usc_OutDmaReg( info, DCR, 0x800b );
5199 /* Receive DMA mode Register (RDMR)
5201 * <15..14> 11 DMA mode = Linked List Buffer mode
5202 * <13> 1 RSBinA/L = store Rx status Block in Arrary/List entry
5203 * <12> 1 Clear count of List Entry after fetching
5204 * <11..10> 00 Address mode = Increment
5205 * <9> 1 Terminate Buffer on RxBound
5206 * <8> 0 Bus Width = 16bits
5207 * <7..0> ? status Bits (write as 0s)
5209 * 1111 0010 0000 0000 = 0xf200
5212 usc_OutDmaReg( info, RDMR, 0xf200 );
5215 /* Transmit DMA mode Register (TDMR)
5217 * <15..14> 11 DMA mode = Linked List Buffer mode
5218 * <13> 1 TCBinA/L = fetch Tx Control Block from List entry
5219 * <12> 1 Clear count of List Entry after fetching
5220 * <11..10> 00 Address mode = Increment
5221 * <9> 1 Terminate Buffer on end of frame
5222 * <8> 0 Bus Width = 16bits
5223 * <7..0> ? status Bits (Read Only so write as 0)
5225 * 1111 0010 0000 0000 = 0xf200
5228 usc_OutDmaReg( info, TDMR, 0xf200 );
5231 /* DMA Interrupt Control Register (DICR)
5233 * <15> 1 DMA Interrupt Enable
5234 * <14> 0 1 = Disable IEO from USC
5235 * <13> 0 1 = Don't provide vector during IntAck
5236 * <12> 1 1 = Include status in Vector
5237 * <10..2> 0 reserved, Must be 0s
5238 * <1> 0 1 = Rx DMA Interrupt Enabled
5239 * <0> 0 1 = Tx DMA Interrupt Enabled
5241 * 1001 0000 0000 0000 = 0x9000
5244 usc_OutDmaReg( info, DICR, 0x9000 );
5246 usc_InDmaReg( info, RDMR ); /* clear pending receive DMA IRQ bits */
5247 usc_InDmaReg( info, TDMR ); /* clear pending transmit DMA IRQ bits */
5248 usc_OutDmaReg( info, CDIR, 0x0303 ); /* clear IUS and Pending for Tx and Rx */
5250 /* Channel Control Register (CCR)
5252 * <15..14> 10 Use 32-bit Tx Control Blocks (TCBs)
5253 * <13> 0 Trigger Tx on SW Command Disabled
5254 * <12> 0 Flag Preamble Disabled
5255 * <11..10> 00 Preamble Length
5256 * <9..8> 00 Preamble Pattern
5257 * <7..6> 10 Use 32-bit Rx status Blocks (RSBs)
5258 * <5> 0 Trigger Rx on SW Command Disabled
5261 * 1000 0000 1000 0000 = 0x8080
5266 switch ( info->params.preamble_length ) {
5267 case HDLC_PREAMBLE_LENGTH_16BITS: RegValue |= BIT10; break;
5268 case HDLC_PREAMBLE_LENGTH_32BITS: RegValue |= BIT11; break;
5269 case HDLC_PREAMBLE_LENGTH_64BITS: RegValue |= BIT11 + BIT10; break;
5272 switch ( info->params.preamble ) {
5273 case HDLC_PREAMBLE_PATTERN_FLAGS: RegValue |= BIT8 + BIT12; break;
5274 case HDLC_PREAMBLE_PATTERN_ONES: RegValue |= BIT8; break;
5275 case HDLC_PREAMBLE_PATTERN_10: RegValue |= BIT9; break;
5276 case HDLC_PREAMBLE_PATTERN_01: RegValue |= BIT9 + BIT8; break;
5279 usc_OutReg( info, CCR, RegValue );
5283 * Burst/Dwell Control Register
5285 * <15..8> 0x20 Maximum number of transfers per bus grant
5286 * <7..0> 0x00 Maximum number of clock cycles per bus grant
5289 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5290 /* don't limit bus occupancy on PCI adapter */
5291 usc_OutDmaReg( info, BDCR, 0x0000 );
5294 usc_OutDmaReg( info, BDCR, 0x2000 );
5296 usc_stop_transmitter(info);
5297 usc_stop_receiver(info);
5299 } /* end of usc_set_sdlc_mode() */
5301 /* usc_enable_loopback()
5303 * Set the 16C32 for internal loopback mode.
5304 * The TxCLK and RxCLK signals are generated from the BRG0 and
5305 * the TxD is looped back to the RxD internally.
5307 * Arguments: info pointer to device instance data
5308 * enable 1 = enable loopback, 0 = disable
5309 * Return Value: None
5311 static void usc_enable_loopback(struct mgsl_struct *info, int enable)
5314 /* blank external TXD output */
5315 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) | (BIT7+BIT6));
5317 /* Clock mode Control Register (CMCR)
5319 * <15..14> 00 counter 1 Disabled
5320 * <13..12> 00 counter 0 Disabled
5321 * <11..10> 11 BRG1 Input is TxC Pin
5322 * <9..8> 11 BRG0 Input is TxC Pin
5323 * <7..6> 01 DPLL Input is BRG1 Output
5324 * <5..3> 100 TxCLK comes from BRG0
5325 * <2..0> 100 RxCLK comes from BRG0
5327 * 0000 1111 0110 0100 = 0x0f64
5330 usc_OutReg( info, CMCR, 0x0f64 );
5332 /* Write 16-bit Time Constant for BRG0 */
5333 /* use clock speed if available, otherwise use 8 for diagnostics */
5334 if (info->params.clock_speed) {
5335 if (info->bus_type == MGSL_BUS_TYPE_PCI)
5336 usc_OutReg(info, TC0R, (u16)((11059200/info->params.clock_speed)-1));
5338 usc_OutReg(info, TC0R, (u16)((14745600/info->params.clock_speed)-1));
5340 usc_OutReg(info, TC0R, (u16)8);
5342 /* Hardware Configuration Register (HCR) Clear Bit 1, BRG0
5343 mode = Continuous Set Bit 0 to enable BRG0. */
5344 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5346 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5347 usc_OutReg(info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004));
5349 /* set Internal Data loopback mode */
5350 info->loopback_bits = 0x300;
5351 outw( 0x0300, info->io_base + CCAR );
5353 /* enable external TXD output */
5354 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) & ~(BIT7+BIT6));
5356 /* clear Internal Data loopback mode */
5357 info->loopback_bits = 0;
5358 outw( 0,info->io_base + CCAR );
5361 } /* end of usc_enable_loopback() */
5363 /* usc_enable_aux_clock()
5365 * Enabled the AUX clock output at the specified frequency.
5369 * info pointer to device extension
5370 * data_rate data rate of clock in bits per second
5371 * A data rate of 0 disables the AUX clock.
5373 * Return Value: None
5375 static void usc_enable_aux_clock( struct mgsl_struct *info, u32 data_rate )
5381 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
5382 XtalSpeed = 11059200;
5384 XtalSpeed = 14745600;
5387 /* Tc = (Xtal/Speed) - 1 */
5388 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
5389 /* then rounding up gives a more precise time constant. Instead */
5390 /* of rounding up and then subtracting 1 we just don't subtract */
5391 /* the one in this case. */
5394 Tc = (u16)(XtalSpeed/data_rate);
5395 if ( !(((XtalSpeed % data_rate) * 2) / data_rate) )
5398 /* Write 16-bit Time Constant for BRG0 */
5399 usc_OutReg( info, TC0R, Tc );
5402 * Hardware Configuration Register (HCR)
5403 * Clear Bit 1, BRG0 mode = Continuous
5404 * Set Bit 0 to enable BRG0.
5407 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5409 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5410 usc_OutReg( info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
5412 /* data rate == 0 so turn off BRG0 */
5413 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
5416 } /* end of usc_enable_aux_clock() */
5420 * usc_process_rxoverrun_sync()
5422 * This function processes a receive overrun by resetting the
5423 * receive DMA buffers and issuing a Purge Rx FIFO command
5424 * to allow the receiver to continue receiving.
5428 * info pointer to device extension
5430 * Return Value: None
5432 static void usc_process_rxoverrun_sync( struct mgsl_struct *info )
5436 int frame_start_index;
5437 int start_of_frame_found = FALSE;
5438 int end_of_frame_found = FALSE;
5439 int reprogram_dma = FALSE;
5441 DMABUFFERENTRY *buffer_list = info->rx_buffer_list;
5444 usc_DmaCmd( info, DmaCmd_PauseRxChannel );
5445 usc_RCmd( info, RCmd_EnterHuntmode );
5446 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5448 /* CurrentRxBuffer points to the 1st buffer of the next */
5449 /* possibly available receive frame. */
5451 frame_start_index = start_index = end_index = info->current_rx_buffer;
5453 /* Search for an unfinished string of buffers. This means */
5454 /* that a receive frame started (at least one buffer with */
5455 /* count set to zero) but there is no terminiting buffer */
5456 /* (status set to non-zero). */
5458 while( !buffer_list[end_index].count )
5460 /* Count field has been reset to zero by 16C32. */
5461 /* This buffer is currently in use. */
5463 if ( !start_of_frame_found )
5465 start_of_frame_found = TRUE;
5466 frame_start_index = end_index;
5467 end_of_frame_found = FALSE;
5470 if ( buffer_list[end_index].status )
5472 /* Status field has been set by 16C32. */
5473 /* This is the last buffer of a received frame. */
5475 /* We want to leave the buffers for this frame intact. */
5476 /* Move on to next possible frame. */
5478 start_of_frame_found = FALSE;
5479 end_of_frame_found = TRUE;
5482 /* advance to next buffer entry in linked list */
5484 if ( end_index == info->rx_buffer_count )
5487 if ( start_index == end_index )
5489 /* The entire list has been searched with all Counts == 0 and */
5490 /* all Status == 0. The receive buffers are */
5491 /* completely screwed, reset all receive buffers! */
5492 mgsl_reset_rx_dma_buffers( info );
5493 frame_start_index = 0;
5494 start_of_frame_found = FALSE;
5495 reprogram_dma = TRUE;
5500 if ( start_of_frame_found && !end_of_frame_found )
5502 /* There is an unfinished string of receive DMA buffers */
5503 /* as a result of the receiver overrun. */
5505 /* Reset the buffers for the unfinished frame */
5506 /* and reprogram the receive DMA controller to start */
5507 /* at the 1st buffer of unfinished frame. */
5509 start_index = frame_start_index;
5513 *((unsigned long *)&(info->rx_buffer_list[start_index++].count)) = DMABUFFERSIZE;
5515 /* Adjust index for wrap around. */
5516 if ( start_index == info->rx_buffer_count )
5519 } while( start_index != end_index );
5521 reprogram_dma = TRUE;
5524 if ( reprogram_dma )
5526 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
5527 usc_ClearIrqPendingBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5528 usc_UnlatchRxstatusBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5530 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5532 /* This empties the receive FIFO and loads the RCC with RCLR */
5533 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5535 /* program 16C32 with physical address of 1st DMA buffer entry */
5536 phys_addr = info->rx_buffer_list[frame_start_index].phys_entry;
5537 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5538 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5540 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5541 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5542 usc_EnableInterrupts( info, RECEIVE_STATUS );
5544 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5545 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5547 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5548 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5549 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5550 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5551 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5553 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5557 /* This empties the receive FIFO and loads the RCC with RCLR */
5558 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5559 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5562 } /* end of usc_process_rxoverrun_sync() */
5564 /* usc_stop_receiver()
5566 * Disable USC receiver
5568 * Arguments: info pointer to device instance data
5569 * Return Value: None
5571 static void usc_stop_receiver( struct mgsl_struct *info )
5573 if (debug_level >= DEBUG_LEVEL_ISR)
5574 printk("%s(%d):usc_stop_receiver(%s)\n",
5575 __FILE__,__LINE__, info->device_name );
5577 /* Disable receive DMA channel. */
5578 /* This also disables receive DMA channel interrupts */
5579 usc_DmaCmd( info, DmaCmd_ResetRxChannel );
5581 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5582 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5583 usc_DisableInterrupts( info, RECEIVE_DATA + RECEIVE_STATUS );
5585 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5587 /* This empties the receive FIFO and loads the RCC with RCLR */
5588 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5589 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5591 info->rx_enabled = 0;
5592 info->rx_overflow = 0;
5593 info->rx_rcc_underrun = 0;
5595 } /* end of stop_receiver() */
5597 /* usc_start_receiver()
5599 * Enable the USC receiver
5601 * Arguments: info pointer to device instance data
5602 * Return Value: None
5604 static void usc_start_receiver( struct mgsl_struct *info )
5608 if (debug_level >= DEBUG_LEVEL_ISR)
5609 printk("%s(%d):usc_start_receiver(%s)\n",
5610 __FILE__,__LINE__, info->device_name );
5612 mgsl_reset_rx_dma_buffers( info );
5613 usc_stop_receiver( info );
5615 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5616 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5618 if ( info->params.mode == MGSL_MODE_HDLC ||
5619 info->params.mode == MGSL_MODE_RAW ) {
5620 /* DMA mode Transfers */
5621 /* Program the DMA controller. */
5622 /* Enable the DMA controller end of buffer interrupt. */
5624 /* program 16C32 with physical address of 1st DMA buffer entry */
5625 phys_addr = info->rx_buffer_list[0].phys_entry;
5626 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5627 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5629 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5630 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5631 usc_EnableInterrupts( info, RECEIVE_STATUS );
5633 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5634 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5636 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5637 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5638 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5639 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5640 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5642 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5644 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
5645 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
5646 usc_EnableInterrupts(info, RECEIVE_DATA);
5648 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5649 usc_RCmd( info, RCmd_EnterHuntmode );
5651 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5654 usc_OutReg( info, CCSR, 0x1020 );
5656 info->rx_enabled = 1;
5658 } /* end of usc_start_receiver() */
5660 /* usc_start_transmitter()
5662 * Enable the USC transmitter and send a transmit frame if
5663 * one is loaded in the DMA buffers.
5665 * Arguments: info pointer to device instance data
5666 * Return Value: None
5668 static void usc_start_transmitter( struct mgsl_struct *info )
5671 unsigned int FrameSize;
5673 if (debug_level >= DEBUG_LEVEL_ISR)
5674 printk("%s(%d):usc_start_transmitter(%s)\n",
5675 __FILE__,__LINE__, info->device_name );
5677 if ( info->xmit_cnt ) {
5679 /* If auto RTS enabled and RTS is inactive, then assert */
5680 /* RTS and set a flag indicating that the driver should */
5681 /* negate RTS when the transmission completes. */
5683 info->drop_rts_on_tx_done = 0;
5685 if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
5686 usc_get_serial_signals( info );
5687 if ( !(info->serial_signals & SerialSignal_RTS) ) {
5688 info->serial_signals |= SerialSignal_RTS;
5689 usc_set_serial_signals( info );
5690 info->drop_rts_on_tx_done = 1;
5695 if ( info->params.mode == MGSL_MODE_ASYNC ) {
5696 if ( !info->tx_active ) {
5697 usc_UnlatchTxstatusBits(info, TXSTATUS_ALL);
5698 usc_ClearIrqPendingBits(info, TRANSMIT_STATUS + TRANSMIT_DATA);
5699 usc_EnableInterrupts(info, TRANSMIT_DATA);
5700 usc_load_txfifo(info);
5703 /* Disable transmit DMA controller while programming. */
5704 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5706 /* Transmit DMA buffer is loaded, so program USC */
5707 /* to send the frame contained in the buffers. */
5709 FrameSize = info->tx_buffer_list[info->start_tx_dma_buffer].rcc;
5711 /* if operating in Raw sync mode, reset the rcc component
5712 * of the tx dma buffer entry, otherwise, the serial controller
5713 * will send a closing sync char after this count.
5715 if ( info->params.mode == MGSL_MODE_RAW )
5716 info->tx_buffer_list[info->start_tx_dma_buffer].rcc = 0;
5718 /* Program the Transmit Character Length Register (TCLR) */
5719 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
5720 usc_OutReg( info, TCLR, (u16)FrameSize );
5722 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5724 /* Program the address of the 1st DMA Buffer Entry in linked list */
5725 phys_addr = info->tx_buffer_list[info->start_tx_dma_buffer].phys_entry;
5726 usc_OutDmaReg( info, NTARL, (u16)phys_addr );
5727 usc_OutDmaReg( info, NTARU, (u16)(phys_addr >> 16) );
5729 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5730 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
5731 usc_EnableInterrupts( info, TRANSMIT_STATUS );
5733 if ( info->params.mode == MGSL_MODE_RAW &&
5734 info->num_tx_dma_buffers > 1 ) {
5735 /* When running external sync mode, attempt to 'stream' transmit */
5736 /* by filling tx dma buffers as they become available. To do this */
5737 /* we need to enable Tx DMA EOB Status interrupts : */
5739 /* 1. Arm End of Buffer (EOB) Transmit DMA Interrupt (BIT2 of TDIAR) */
5740 /* 2. Enable Transmit DMA Interrupts (BIT0 of DICR) */
5742 usc_OutDmaReg( info, TDIAR, BIT2|BIT3 );
5743 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT0) );
5746 /* Initialize Transmit DMA Channel */
5747 usc_DmaCmd( info, DmaCmd_InitTxChannel );
5749 usc_TCmd( info, TCmd_SendFrame );
5751 info->tx_timer.expires = jiffies + msecs_to_jiffies(5000);
5752 add_timer(&info->tx_timer);
5754 info->tx_active = 1;
5757 if ( !info->tx_enabled ) {
5758 info->tx_enabled = 1;
5759 if ( info->params.flags & HDLC_FLAG_AUTO_CTS )
5760 usc_EnableTransmitter(info,ENABLE_AUTO_CTS);
5762 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
5765 } /* end of usc_start_transmitter() */
5767 /* usc_stop_transmitter()
5769 * Stops the transmitter and DMA
5771 * Arguments: info pointer to device isntance data
5772 * Return Value: None
5774 static void usc_stop_transmitter( struct mgsl_struct *info )
5776 if (debug_level >= DEBUG_LEVEL_ISR)
5777 printk("%s(%d):usc_stop_transmitter(%s)\n",
5778 __FILE__,__LINE__, info->device_name );
5780 del_timer(&info->tx_timer);
5782 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5783 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5784 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5786 usc_EnableTransmitter(info,DISABLE_UNCONDITIONAL);
5787 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5788 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5790 info->tx_enabled = 0;
5791 info->tx_active = 0;
5793 } /* end of usc_stop_transmitter() */
5795 /* usc_load_txfifo()
5797 * Fill the transmit FIFO until the FIFO is full or
5798 * there is no more data to load.
5800 * Arguments: info pointer to device extension (instance data)
5801 * Return Value: None
5803 static void usc_load_txfifo( struct mgsl_struct *info )
5808 if ( !info->xmit_cnt && !info->x_char )
5811 /* Select transmit FIFO status readback in TICR */
5812 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
5814 /* load the Transmit FIFO until FIFOs full or all data sent */
5816 while( (Fifocount = usc_InReg(info, TICR) >> 8) && info->xmit_cnt ) {
5817 /* there is more space in the transmit FIFO and */
5818 /* there is more data in transmit buffer */
5820 if ( (info->xmit_cnt > 1) && (Fifocount > 1) && !info->x_char ) {
5821 /* write a 16-bit word from transmit buffer to 16C32 */
5823 TwoBytes[0] = info->xmit_buf[info->xmit_tail++];
5824 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5825 TwoBytes[1] = info->xmit_buf[info->xmit_tail++];
5826 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5828 outw( *((u16 *)TwoBytes), info->io_base + DATAREG);
5830 info->xmit_cnt -= 2;
5831 info->icount.tx += 2;
5833 /* only 1 byte left to transmit or 1 FIFO slot left */
5835 outw( (inw( info->io_base + CCAR) & 0x0780) | (TDR+LSBONLY),
5836 info->io_base + CCAR );
5839 /* transmit pending high priority char */
5840 outw( info->x_char,info->io_base + CCAR );
5843 outw( info->xmit_buf[info->xmit_tail++],info->io_base + CCAR );
5844 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5851 } /* end of usc_load_txfifo() */
5855 * Reset the adapter to a known state and prepare it for further use.
5857 * Arguments: info pointer to device instance data
5858 * Return Value: None
5860 static void usc_reset( struct mgsl_struct *info )
5862 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5866 /* Set BIT30 of Misc Control Register */
5867 /* (Local Control Register 0x50) to force reset of USC. */
5869 volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5870 u32 *LCR0BRDR = (u32 *)(info->lcr_base + 0x28);
5872 info->misc_ctrl_value |= BIT30;
5873 *MiscCtrl = info->misc_ctrl_value;
5876 * Force at least 170ns delay before clearing
5877 * reset bit. Each read from LCR takes at least
5878 * 30ns so 10 times for 300ns to be safe.
5881 readval = *MiscCtrl;
5883 info->misc_ctrl_value &= ~BIT30;
5884 *MiscCtrl = info->misc_ctrl_value;
5886 *LCR0BRDR = BUS_DESCRIPTOR(
5887 1, // Write Strobe Hold (0-3)
5888 2, // Write Strobe Delay (0-3)
5889 2, // Read Strobe Delay (0-3)
5890 0, // NWDD (Write data-data) (0-3)
5891 4, // NWAD (Write Addr-data) (0-31)
5892 0, // NXDA (Read/Write Data-Addr) (0-3)
5893 0, // NRDD (Read Data-Data) (0-3)
5894 5 // NRAD (Read Addr-Data) (0-31)
5898 outb( 0,info->io_base + 8 );
5902 info->loopback_bits = 0;
5903 info->usc_idle_mode = 0;
5906 * Program the Bus Configuration Register (BCR)
5908 * <15> 0 Don't use separate address
5909 * <14..6> 0 reserved
5910 * <5..4> 00 IAckmode = Default, don't care
5911 * <3> 1 Bus Request Totem Pole output
5912 * <2> 1 Use 16 Bit data bus
5913 * <1> 0 IRQ Totem Pole output
5914 * <0> 0 Don't Shift Right Addr
5916 * 0000 0000 0000 1100 = 0x000c
5918 * By writing to io_base + SDPIN the Wait/Ack pin is
5919 * programmed to work as a Wait pin.
5922 outw( 0x000c,info->io_base + SDPIN );
5925 outw( 0,info->io_base );
5926 outw( 0,info->io_base + CCAR );
5928 /* select little endian byte ordering */
5929 usc_RTCmd( info, RTCmd_SelectLittleEndian );
5932 /* Port Control Register (PCR)
5934 * <15..14> 11 Port 7 is Output (~DMAEN, Bit 14 : 0 = Enabled)
5935 * <13..12> 11 Port 6 is Output (~INTEN, Bit 12 : 0 = Enabled)
5936 * <11..10> 00 Port 5 is Input (No Connect, Don't Care)
5937 * <9..8> 00 Port 4 is Input (No Connect, Don't Care)
5938 * <7..6> 11 Port 3 is Output (~RTS, Bit 6 : 0 = Enabled )
5939 * <5..4> 11 Port 2 is Output (~DTR, Bit 4 : 0 = Enabled )
5940 * <3..2> 01 Port 1 is Input (Dedicated RxC)
5941 * <1..0> 01 Port 0 is Input (Dedicated TxC)
5943 * 1111 0000 1111 0101 = 0xf0f5
5946 usc_OutReg( info, PCR, 0xf0f5 );
5950 * Input/Output Control Register
5952 * <15..14> 00 CTS is active low input
5953 * <13..12> 00 DCD is active low input
5954 * <11..10> 00 TxREQ pin is input (DSR)
5955 * <9..8> 00 RxREQ pin is input (RI)
5956 * <7..6> 00 TxD is output (Transmit Data)
5957 * <5..3> 000 TxC Pin in Input (14.7456MHz Clock)
5958 * <2..0> 100 RxC is Output (drive with BRG0)
5960 * 0000 0000 0000 0100 = 0x0004
5963 usc_OutReg( info, IOCR, 0x0004 );
5965 } /* end of usc_reset() */
5967 /* usc_set_async_mode()
5969 * Program adapter for asynchronous communications.
5971 * Arguments: info pointer to device instance data
5972 * Return Value: None
5974 static void usc_set_async_mode( struct mgsl_struct *info )
5978 /* disable interrupts while programming USC */
5979 usc_DisableMasterIrqBit( info );
5981 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5982 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5984 usc_loopback_frame( info );
5986 /* Channel mode Register (CMR)
5988 * <15..14> 00 Tx Sub modes, 00 = 1 Stop Bit
5989 * <13..12> 00 00 = 16X Clock
5990 * <11..8> 0000 Transmitter mode = Asynchronous
5991 * <7..6> 00 reserved?
5992 * <5..4> 00 Rx Sub modes, 00 = 16X Clock
5993 * <3..0> 0000 Receiver mode = Asynchronous
5995 * 0000 0000 0000 0000 = 0x0
5999 if ( info->params.stop_bits != 1 )
6001 usc_OutReg( info, CMR, RegValue );
6004 /* Receiver mode Register (RMR)
6006 * <15..13> 000 encoding = None
6007 * <12..08> 00000 reserved (Sync Only)
6008 * <7..6> 00 Even parity
6009 * <5> 0 parity disabled
6010 * <4..2> 000 Receive Char Length = 8 bits
6011 * <1..0> 00 Disable Receiver
6013 * 0000 0000 0000 0000 = 0x0
6018 if ( info->params.data_bits != 8 )
6019 RegValue |= BIT4+BIT3+BIT2;
6021 if ( info->params.parity != ASYNC_PARITY_NONE ) {
6023 if ( info->params.parity != ASYNC_PARITY_ODD )
6027 usc_OutReg( info, RMR, RegValue );
6030 /* Set IRQ trigger level */
6032 usc_RCmd( info, RCmd_SelectRicrIntLevel );
6035 /* Receive Interrupt Control Register (RICR)
6037 * <15..8> ? RxFIFO IRQ Request Level
6039 * Note: For async mode the receive FIFO level must be set
6040 * to 0 to aviod the situation where the FIFO contains fewer bytes
6041 * than the trigger level and no more data is expected.
6043 * <7> 0 Exited Hunt IA (Interrupt Arm)
6044 * <6> 0 Idle Received IA
6045 * <5> 0 Break/Abort IA
6047 * <3> 0 Queued status reflects oldest byte in FIFO
6049 * <1> 0 Rx Overrun IA
6050 * <0> 0 Select TC0 value for readback
6052 * 0000 0000 0100 0000 = 0x0000 + (FIFOLEVEL in MSB)
6055 usc_OutReg( info, RICR, 0x0000 );
6057 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
6058 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
6061 /* Transmit mode Register (TMR)
6063 * <15..13> 000 encoding = None
6064 * <12..08> 00000 reserved (Sync Only)
6065 * <7..6> 00 Transmit parity Even
6066 * <5> 0 Transmit parity Disabled
6067 * <4..2> 000 Tx Char Length = 8 bits
6068 * <1..0> 00 Disable Transmitter
6070 * 0000 0000 0000 0000 = 0x0
6075 if ( info->params.data_bits != 8 )
6076 RegValue |= BIT4+BIT3+BIT2;
6078 if ( info->params.parity != ASYNC_PARITY_NONE ) {
6080 if ( info->params.parity != ASYNC_PARITY_ODD )
6084 usc_OutReg( info, TMR, RegValue );
6086 usc_set_txidle( info );
6089 /* Set IRQ trigger level */
6091 usc_TCmd( info, TCmd_SelectTicrIntLevel );
6094 /* Transmit Interrupt Control Register (TICR)
6096 * <15..8> ? Transmit FIFO IRQ Level
6097 * <7> 0 Present IA (Interrupt Arm)
6098 * <6> 1 Idle Sent IA
6099 * <5> 0 Abort Sent IA
6100 * <4> 0 EOF/EOM Sent IA
6102 * <2> 0 1 = Wait for SW Trigger to Start Frame
6103 * <1> 0 Tx Underrun IA
6104 * <0> 0 TC0 constant on read back
6106 * 0000 0000 0100 0000 = 0x0040
6109 usc_OutReg( info, TICR, 0x1f40 );
6111 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
6112 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
6114 usc_enable_async_clock( info, info->params.data_rate );
6117 /* Channel Control/status Register (CCSR)
6119 * <15> X RCC FIFO Overflow status (RO)
6120 * <14> X RCC FIFO Not Empty status (RO)
6121 * <13> 0 1 = Clear RCC FIFO (WO)
6122 * <12> X DPLL in Sync status (RO)
6123 * <11> X DPLL 2 Missed Clocks status (RO)
6124 * <10> X DPLL 1 Missed Clock status (RO)
6125 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
6126 * <7> X SDLC Loop On status (RO)
6127 * <6> X SDLC Loop Send status (RO)
6128 * <5> 1 Bypass counters for TxClk and RxClk (RW)
6129 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
6130 * <1..0> 00 reserved
6132 * 0000 0000 0010 0000 = 0x0020
6135 usc_OutReg( info, CCSR, 0x0020 );
6137 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6138 RECEIVE_DATA + RECEIVE_STATUS );
6140 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6141 RECEIVE_DATA + RECEIVE_STATUS );
6143 usc_EnableMasterIrqBit( info );
6145 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6146 /* Enable INTEN (Port 6, Bit12) */
6147 /* This connects the IRQ request signal to the ISA bus */
6148 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6151 if (info->params.loopback) {
6152 info->loopback_bits = 0x300;
6153 outw(0x0300, info->io_base + CCAR);
6156 } /* end of usc_set_async_mode() */
6158 /* usc_loopback_frame()
6160 * Loop back a small (2 byte) dummy SDLC frame.
6161 * Interrupts and DMA are NOT used. The purpose of this is to
6162 * clear any 'stale' status info left over from running in async mode.
6164 * The 16C32 shows the strange behaviour of marking the 1st
6165 * received SDLC frame with a CRC error even when there is no
6166 * CRC error. To get around this a small dummy from of 2 bytes
6167 * is looped back when switching from async to sync mode.
6169 * Arguments: info pointer to device instance data
6170 * Return Value: None
6172 static void usc_loopback_frame( struct mgsl_struct *info )
6175 unsigned long oldmode = info->params.mode;
6177 info->params.mode = MGSL_MODE_HDLC;
6179 usc_DisableMasterIrqBit( info );
6181 usc_set_sdlc_mode( info );
6182 usc_enable_loopback( info, 1 );
6184 /* Write 16-bit Time Constant for BRG0 */
6185 usc_OutReg( info, TC0R, 0 );
6187 /* Channel Control Register (CCR)
6189 * <15..14> 00 Don't use 32-bit Tx Control Blocks (TCBs)
6190 * <13> 0 Trigger Tx on SW Command Disabled
6191 * <12> 0 Flag Preamble Disabled
6192 * <11..10> 00 Preamble Length = 8-Bits
6193 * <9..8> 01 Preamble Pattern = flags
6194 * <7..6> 10 Don't use 32-bit Rx status Blocks (RSBs)
6195 * <5> 0 Trigger Rx on SW Command Disabled
6198 * 0000 0001 0000 0000 = 0x0100
6201 usc_OutReg( info, CCR, 0x0100 );
6203 /* SETUP RECEIVER */
6204 usc_RTCmd( info, RTCmd_PurgeRxFifo );
6205 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
6207 /* SETUP TRANSMITTER */
6208 /* Program the Transmit Character Length Register (TCLR) */
6209 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
6210 usc_OutReg( info, TCLR, 2 );
6211 usc_RTCmd( info, RTCmd_PurgeTxFifo );
6213 /* unlatch Tx status bits, and start transmit channel. */
6214 usc_UnlatchTxstatusBits(info,TXSTATUS_ALL);
6215 outw(0,info->io_base + DATAREG);
6217 /* ENABLE TRANSMITTER */
6218 usc_TCmd( info, TCmd_SendFrame );
6219 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
6221 /* WAIT FOR RECEIVE COMPLETE */
6222 for (i=0 ; i<1000 ; i++)
6223 if (usc_InReg( info, RCSR ) & (BIT8 + BIT4 + BIT3 + BIT1))
6226 /* clear Internal Data loopback mode */
6227 usc_enable_loopback(info, 0);
6229 usc_EnableMasterIrqBit(info);
6231 info->params.mode = oldmode;
6233 } /* end of usc_loopback_frame() */
6235 /* usc_set_sync_mode() Programs the USC for SDLC communications.
6237 * Arguments: info pointer to adapter info structure
6238 * Return Value: None
6240 static void usc_set_sync_mode( struct mgsl_struct *info )
6242 usc_loopback_frame( info );
6243 usc_set_sdlc_mode( info );
6245 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6246 /* Enable INTEN (Port 6, Bit12) */
6247 /* This connects the IRQ request signal to the ISA bus */
6248 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6251 usc_enable_aux_clock(info, info->params.clock_speed);
6253 if (info->params.loopback)
6254 usc_enable_loopback(info,1);
6256 } /* end of mgsl_set_sync_mode() */
6258 /* usc_set_txidle() Set the HDLC idle mode for the transmitter.
6260 * Arguments: info pointer to device instance data
6261 * Return Value: None
6263 static void usc_set_txidle( struct mgsl_struct *info )
6265 u16 usc_idle_mode = IDLEMODE_FLAGS;
6267 /* Map API idle mode to USC register bits */
6269 switch( info->idle_mode ){
6270 case HDLC_TXIDLE_FLAGS: usc_idle_mode = IDLEMODE_FLAGS; break;
6271 case HDLC_TXIDLE_ALT_ZEROS_ONES: usc_idle_mode = IDLEMODE_ALT_ONE_ZERO; break;
6272 case HDLC_TXIDLE_ZEROS: usc_idle_mode = IDLEMODE_ZERO; break;
6273 case HDLC_TXIDLE_ONES: usc_idle_mode = IDLEMODE_ONE; break;
6274 case HDLC_TXIDLE_ALT_MARK_SPACE: usc_idle_mode = IDLEMODE_ALT_MARK_SPACE; break;
6275 case HDLC_TXIDLE_SPACE: usc_idle_mode = IDLEMODE_SPACE; break;
6276 case HDLC_TXIDLE_MARK: usc_idle_mode = IDLEMODE_MARK; break;
6279 info->usc_idle_mode = usc_idle_mode;
6280 //usc_OutReg(info, TCSR, usc_idle_mode);
6281 info->tcsr_value &= ~IDLEMODE_MASK; /* clear idle mode bits */
6282 info->tcsr_value += usc_idle_mode;
6283 usc_OutReg(info, TCSR, info->tcsr_value);
6286 * if SyncLink WAN adapter is running in external sync mode, the
6287 * transmitter has been set to Monosync in order to try to mimic
6288 * a true raw outbound bit stream. Monosync still sends an open/close
6289 * sync char at the start/end of a frame. Try to match those sync
6290 * patterns to the idle mode set here
6292 if ( info->params.mode == MGSL_MODE_RAW ) {
6293 unsigned char syncpat = 0;
6294 switch( info->idle_mode ) {
6295 case HDLC_TXIDLE_FLAGS:
6298 case HDLC_TXIDLE_ALT_ZEROS_ONES:
6301 case HDLC_TXIDLE_ZEROS:
6302 case HDLC_TXIDLE_SPACE:
6305 case HDLC_TXIDLE_ONES:
6306 case HDLC_TXIDLE_MARK:
6309 case HDLC_TXIDLE_ALT_MARK_SPACE:
6314 usc_SetTransmitSyncChars(info,syncpat,syncpat);
6317 } /* end of usc_set_txidle() */
6319 /* usc_get_serial_signals()
6321 * Query the adapter for the state of the V24 status (input) signals.
6323 * Arguments: info pointer to device instance data
6324 * Return Value: None
6326 static void usc_get_serial_signals( struct mgsl_struct *info )
6330 /* clear all serial signals except DTR and RTS */
6331 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
6333 /* Read the Misc Interrupt status Register (MISR) to get */
6334 /* the V24 status signals. */
6336 status = usc_InReg( info, MISR );
6338 /* set serial signal bits to reflect MISR */
6340 if ( status & MISCSTATUS_CTS )
6341 info->serial_signals |= SerialSignal_CTS;
6343 if ( status & MISCSTATUS_DCD )
6344 info->serial_signals |= SerialSignal_DCD;
6346 if ( status & MISCSTATUS_RI )
6347 info->serial_signals |= SerialSignal_RI;
6349 if ( status & MISCSTATUS_DSR )
6350 info->serial_signals |= SerialSignal_DSR;
6352 } /* end of usc_get_serial_signals() */
6354 /* usc_set_serial_signals()
6356 * Set the state of DTR and RTS based on contents of
6357 * serial_signals member of device extension.
6359 * Arguments: info pointer to device instance data
6360 * Return Value: None
6362 static void usc_set_serial_signals( struct mgsl_struct *info )
6365 unsigned char V24Out = info->serial_signals;
6367 /* get the current value of the Port Control Register (PCR) */
6369 Control = usc_InReg( info, PCR );
6371 if ( V24Out & SerialSignal_RTS )
6376 if ( V24Out & SerialSignal_DTR )
6381 usc_OutReg( info, PCR, Control );
6383 } /* end of usc_set_serial_signals() */
6385 /* usc_enable_async_clock()
6387 * Enable the async clock at the specified frequency.
6389 * Arguments: info pointer to device instance data
6390 * data_rate data rate of clock in bps
6391 * 0 disables the AUX clock.
6392 * Return Value: None
6394 static void usc_enable_async_clock( struct mgsl_struct *info, u32 data_rate )
6398 * Clock mode Control Register (CMCR)
6400 * <15..14> 00 counter 1 Disabled
6401 * <13..12> 00 counter 0 Disabled
6402 * <11..10> 11 BRG1 Input is TxC Pin
6403 * <9..8> 11 BRG0 Input is TxC Pin
6404 * <7..6> 01 DPLL Input is BRG1 Output
6405 * <5..3> 100 TxCLK comes from BRG0
6406 * <2..0> 100 RxCLK comes from BRG0
6408 * 0000 1111 0110 0100 = 0x0f64
6411 usc_OutReg( info, CMCR, 0x0f64 );
6415 * Write 16-bit Time Constant for BRG0
6416 * Time Constant = (ClkSpeed / data_rate) - 1
6417 * ClkSpeed = 921600 (ISA), 691200 (PCI)
6420 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6421 usc_OutReg( info, TC0R, (u16)((691200/data_rate) - 1) );
6423 usc_OutReg( info, TC0R, (u16)((921600/data_rate) - 1) );
6427 * Hardware Configuration Register (HCR)
6428 * Clear Bit 1, BRG0 mode = Continuous
6429 * Set Bit 0 to enable BRG0.
6432 usc_OutReg( info, HCR,
6433 (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
6436 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
6438 usc_OutReg( info, IOCR,
6439 (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
6441 /* data rate == 0 so turn off BRG0 */
6442 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
6445 } /* end of usc_enable_async_clock() */
6448 * Buffer Structures:
6450 * Normal memory access uses virtual addresses that can make discontiguous
6451 * physical memory pages appear to be contiguous in the virtual address
6452 * space (the processors memory mapping handles the conversions).
6454 * DMA transfers require physically contiguous memory. This is because
6455 * the DMA system controller and DMA bus masters deal with memory using
6456 * only physical addresses.
6458 * This causes a problem under Windows NT when large DMA buffers are
6459 * needed. Fragmentation of the nonpaged pool prevents allocations of
6460 * physically contiguous buffers larger than the PAGE_SIZE.
6462 * However the 16C32 supports Bus Master Scatter/Gather DMA which
6463 * allows DMA transfers to physically discontiguous buffers. Information
6464 * about each data transfer buffer is contained in a memory structure
6465 * called a 'buffer entry'. A list of buffer entries is maintained
6466 * to track and control the use of the data transfer buffers.
6468 * To support this strategy we will allocate sufficient PAGE_SIZE
6469 * contiguous memory buffers to allow for the total required buffer
6472 * The 16C32 accesses the list of buffer entries using Bus Master
6473 * DMA. Control information is read from the buffer entries by the
6474 * 16C32 to control data transfers. status information is written to
6475 * the buffer entries by the 16C32 to indicate the status of completed
6478 * The CPU writes control information to the buffer entries to control
6479 * the 16C32 and reads status information from the buffer entries to
6480 * determine information about received and transmitted frames.
6482 * Because the CPU and 16C32 (adapter) both need simultaneous access
6483 * to the buffer entries, the buffer entry memory is allocated with
6484 * HalAllocateCommonBuffer(). This restricts the size of the buffer
6485 * entry list to PAGE_SIZE.
6487 * The actual data buffers on the other hand will only be accessed
6488 * by the CPU or the adapter but not by both simultaneously. This allows
6489 * Scatter/Gather packet based DMA procedures for using physically
6490 * discontiguous pages.
6494 * mgsl_reset_tx_dma_buffers()
6496 * Set the count for all transmit buffers to 0 to indicate the
6497 * buffer is available for use and set the current buffer to the
6498 * first buffer. This effectively makes all buffers free and
6499 * discards any data in buffers.
6501 * Arguments: info pointer to device instance data
6502 * Return Value: None
6504 static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info )
6508 for ( i = 0; i < info->tx_buffer_count; i++ ) {
6509 *((unsigned long *)&(info->tx_buffer_list[i].count)) = 0;
6512 info->current_tx_buffer = 0;
6513 info->start_tx_dma_buffer = 0;
6514 info->tx_dma_buffers_used = 0;
6516 info->get_tx_holding_index = 0;
6517 info->put_tx_holding_index = 0;
6518 info->tx_holding_count = 0;
6520 } /* end of mgsl_reset_tx_dma_buffers() */
6523 * num_free_tx_dma_buffers()
6525 * returns the number of free tx dma buffers available
6527 * Arguments: info pointer to device instance data
6528 * Return Value: number of free tx dma buffers
6530 static int num_free_tx_dma_buffers(struct mgsl_struct *info)
6532 return info->tx_buffer_count - info->tx_dma_buffers_used;
6536 * mgsl_reset_rx_dma_buffers()
6538 * Set the count for all receive buffers to DMABUFFERSIZE
6539 * and set the current buffer to the first buffer. This effectively
6540 * makes all buffers free and discards any data in buffers.
6542 * Arguments: info pointer to device instance data
6543 * Return Value: None
6545 static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info )
6549 for ( i = 0; i < info->rx_buffer_count; i++ ) {
6550 *((unsigned long *)&(info->rx_buffer_list[i].count)) = DMABUFFERSIZE;
6551 // info->rx_buffer_list[i].count = DMABUFFERSIZE;
6552 // info->rx_buffer_list[i].status = 0;
6555 info->current_rx_buffer = 0;
6557 } /* end of mgsl_reset_rx_dma_buffers() */
6560 * mgsl_free_rx_frame_buffers()
6562 * Free the receive buffers used by a received SDLC
6563 * frame such that the buffers can be reused.
6567 * info pointer to device instance data
6568 * StartIndex index of 1st receive buffer of frame
6569 * EndIndex index of last receive buffer of frame
6571 * Return Value: None
6573 static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex )
6576 DMABUFFERENTRY *pBufEntry;
6579 /* Starting with 1st buffer entry of the frame clear the status */
6580 /* field and set the count field to DMA Buffer Size. */
6585 pBufEntry = &(info->rx_buffer_list[Index]);
6587 if ( Index == EndIndex ) {
6588 /* This is the last buffer of the frame! */
6592 /* reset current buffer for reuse */
6593 // pBufEntry->status = 0;
6594 // pBufEntry->count = DMABUFFERSIZE;
6595 *((unsigned long *)&(pBufEntry->count)) = DMABUFFERSIZE;
6597 /* advance to next buffer entry in linked list */
6599 if ( Index == info->rx_buffer_count )
6603 /* set current buffer to next buffer after last buffer of frame */
6604 info->current_rx_buffer = Index;
6606 } /* end of free_rx_frame_buffers() */
6608 /* mgsl_get_rx_frame()
6610 * This function attempts to return a received SDLC frame from the
6611 * receive DMA buffers. Only frames received without errors are returned.
6613 * Arguments: info pointer to device extension
6614 * Return Value: 1 if frame returned, otherwise 0
6616 static int mgsl_get_rx_frame(struct mgsl_struct *info)
6618 unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
6619 unsigned short status;
6620 DMABUFFERENTRY *pBufEntry;
6621 unsigned int framesize = 0;
6623 unsigned long flags;
6624 struct tty_struct *tty = info->tty;
6625 int return_frame = 0;
6628 * current_rx_buffer points to the 1st buffer of the next available
6629 * receive frame. To find the last buffer of the frame look for
6630 * a non-zero status field in the buffer entries. (The status
6631 * field is set by the 16C32 after completing a receive frame.
6634 StartIndex = EndIndex = info->current_rx_buffer;
6636 while( !info->rx_buffer_list[EndIndex].status ) {
6638 * If the count field of the buffer entry is non-zero then
6639 * this buffer has not been used. (The 16C32 clears the count
6640 * field when it starts using the buffer.) If an unused buffer
6641 * is encountered then there are no frames available.
6644 if ( info->rx_buffer_list[EndIndex].count )
6647 /* advance to next buffer entry in linked list */
6649 if ( EndIndex == info->rx_buffer_count )
6652 /* if entire list searched then no frame available */
6653 if ( EndIndex == StartIndex ) {
6654 /* If this occurs then something bad happened,
6655 * all buffers have been 'used' but none mark
6656 * the end of a frame. Reset buffers and receiver.
6659 if ( info->rx_enabled ){
6660 spin_lock_irqsave(&info->irq_spinlock,flags);
6661 usc_start_receiver(info);
6662 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6669 /* check status of receive frame */
6671 status = info->rx_buffer_list[EndIndex].status;
6673 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6674 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6675 if ( status & RXSTATUS_SHORT_FRAME )
6676 info->icount.rxshort++;
6677 else if ( status & RXSTATUS_ABORT )
6678 info->icount.rxabort++;
6679 else if ( status & RXSTATUS_OVERRUN )
6680 info->icount.rxover++;
6682 info->icount.rxcrc++;
6683 if ( info->params.crc_type & HDLC_CRC_RETURN_EX )
6689 struct net_device_stats *stats = hdlc_stats(info->netdev);
6691 stats->rx_frame_errors++;
6697 if ( return_frame ) {
6698 /* receive frame has no errors, get frame size.
6699 * The frame size is the starting value of the RCC (which was
6700 * set to 0xffff) minus the ending value of the RCC (decremented
6701 * once for each receive character) minus 2 for the 16-bit CRC.
6704 framesize = RCLRVALUE - info->rx_buffer_list[EndIndex].rcc;
6706 /* adjust frame size for CRC if any */
6707 if ( info->params.crc_type == HDLC_CRC_16_CCITT )
6709 else if ( info->params.crc_type == HDLC_CRC_32_CCITT )
6713 if ( debug_level >= DEBUG_LEVEL_BH )
6714 printk("%s(%d):mgsl_get_rx_frame(%s) status=%04X size=%d\n",
6715 __FILE__,__LINE__,info->device_name,status,framesize);
6717 if ( debug_level >= DEBUG_LEVEL_DATA )
6718 mgsl_trace_block(info,info->rx_buffer_list[StartIndex].virt_addr,
6719 min_t(int, framesize, DMABUFFERSIZE),0);
6722 if ( ( (info->params.crc_type & HDLC_CRC_RETURN_EX) &&
6723 ((framesize+1) > info->max_frame_size) ) ||
6724 (framesize > info->max_frame_size) )
6725 info->icount.rxlong++;
6727 /* copy dma buffer(s) to contiguous intermediate buffer */
6728 int copy_count = framesize;
6729 int index = StartIndex;
6730 unsigned char *ptmp = info->intermediate_rxbuffer;
6732 if ( !(status & RXSTATUS_CRC_ERROR))
6733 info->icount.rxok++;
6737 if ( copy_count > DMABUFFERSIZE )
6738 partial_count = DMABUFFERSIZE;
6740 partial_count = copy_count;
6742 pBufEntry = &(info->rx_buffer_list[index]);
6743 memcpy( ptmp, pBufEntry->virt_addr, partial_count );
6744 ptmp += partial_count;
6745 copy_count -= partial_count;
6747 if ( ++index == info->rx_buffer_count )
6751 if ( info->params.crc_type & HDLC_CRC_RETURN_EX ) {
6753 *ptmp = (status & RXSTATUS_CRC_ERROR ?
6757 if ( debug_level >= DEBUG_LEVEL_DATA )
6758 printk("%s(%d):mgsl_get_rx_frame(%s) rx frame status=%d\n",
6759 __FILE__,__LINE__,info->device_name,
6765 hdlcdev_rx(info,info->intermediate_rxbuffer,framesize);
6768 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6771 /* Free the buffers used by this frame. */
6772 mgsl_free_rx_frame_buffers( info, StartIndex, EndIndex );
6778 if ( info->rx_enabled && info->rx_overflow ) {
6779 /* The receiver needs to restarted because of
6780 * a receive overflow (buffer or FIFO). If the
6781 * receive buffers are now empty, then restart receiver.
6784 if ( !info->rx_buffer_list[EndIndex].status &&
6785 info->rx_buffer_list[EndIndex].count ) {
6786 spin_lock_irqsave(&info->irq_spinlock,flags);
6787 usc_start_receiver(info);
6788 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6794 } /* end of mgsl_get_rx_frame() */
6796 /* mgsl_get_raw_rx_frame()
6798 * This function attempts to return a received frame from the
6799 * receive DMA buffers when running in external loop mode. In this mode,
6800 * we will return at most one DMABUFFERSIZE frame to the application.
6801 * The USC receiver is triggering off of DCD going active to start a new
6802 * frame, and DCD going inactive to terminate the frame (similar to
6803 * processing a closing flag character).
6805 * In this routine, we will return DMABUFFERSIZE "chunks" at a time.
6806 * If DCD goes inactive, the last Rx DMA Buffer will have a non-zero
6807 * status field and the RCC field will indicate the length of the
6808 * entire received frame. We take this RCC field and get the modulus
6809 * of RCC and DMABUFFERSIZE to determine if number of bytes in the
6810 * last Rx DMA buffer and return that last portion of the frame.
6812 * Arguments: info pointer to device extension
6813 * Return Value: 1 if frame returned, otherwise 0
6815 static int mgsl_get_raw_rx_frame(struct mgsl_struct *info)
6817 unsigned int CurrentIndex, NextIndex;
6818 unsigned short status;
6819 DMABUFFERENTRY *pBufEntry;
6820 unsigned int framesize = 0;
6822 unsigned long flags;
6823 struct tty_struct *tty = info->tty;
6826 * current_rx_buffer points to the 1st buffer of the next available
6827 * receive frame. The status field is set by the 16C32 after
6828 * completing a receive frame. If the status field of this buffer
6829 * is zero, either the USC is still filling this buffer or this
6830 * is one of a series of buffers making up a received frame.
6832 * If the count field of this buffer is zero, the USC is either
6833 * using this buffer or has used this buffer. Look at the count
6834 * field of the next buffer. If that next buffer's count is
6835 * non-zero, the USC is still actively using the current buffer.
6836 * Otherwise, if the next buffer's count field is zero, the
6837 * current buffer is complete and the USC is using the next
6840 CurrentIndex = NextIndex = info->current_rx_buffer;
6842 if ( NextIndex == info->rx_buffer_count )
6845 if ( info->rx_buffer_list[CurrentIndex].status != 0 ||
6846 (info->rx_buffer_list[CurrentIndex].count == 0 &&
6847 info->rx_buffer_list[NextIndex].count == 0)) {
6849 * Either the status field of this dma buffer is non-zero
6850 * (indicating the last buffer of a receive frame) or the next
6851 * buffer is marked as in use -- implying this buffer is complete
6852 * and an intermediate buffer for this received frame.
6855 status = info->rx_buffer_list[CurrentIndex].status;
6857 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6858 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6859 if ( status & RXSTATUS_SHORT_FRAME )
6860 info->icount.rxshort++;
6861 else if ( status & RXSTATUS_ABORT )
6862 info->icount.rxabort++;
6863 else if ( status & RXSTATUS_OVERRUN )
6864 info->icount.rxover++;
6866 info->icount.rxcrc++;
6870 * A receive frame is available, get frame size and status.
6872 * The frame size is the starting value of the RCC (which was
6873 * set to 0xffff) minus the ending value of the RCC (decremented
6874 * once for each receive character) minus 2 or 4 for the 16-bit
6877 * If the status field is zero, this is an intermediate buffer.
6880 * If the DMA Buffer Entry's Status field is non-zero, the
6881 * receive operation completed normally (ie: DCD dropped). The
6882 * RCC field is valid and holds the received frame size.
6883 * It is possible that the RCC field will be zero on a DMA buffer
6884 * entry with a non-zero status. This can occur if the total
6885 * frame size (number of bytes between the time DCD goes active
6886 * to the time DCD goes inactive) exceeds 65535 bytes. In this
6887 * case the 16C32 has underrun on the RCC count and appears to
6888 * stop updating this counter to let us know the actual received
6889 * frame size. If this happens (non-zero status and zero RCC),
6890 * simply return the entire RxDMA Buffer
6894 * In the event that the final RxDMA Buffer is
6895 * terminated with a non-zero status and the RCC
6896 * field is zero, we interpret this as the RCC
6897 * having underflowed (received frame > 65535 bytes).
6899 * Signal the event to the user by passing back
6900 * a status of RxStatus_CrcError returning the full
6901 * buffer and let the app figure out what data is
6904 if ( info->rx_buffer_list[CurrentIndex].rcc )
6905 framesize = RCLRVALUE - info->rx_buffer_list[CurrentIndex].rcc;
6907 framesize = DMABUFFERSIZE;
6910 framesize = DMABUFFERSIZE;
6913 if ( framesize > DMABUFFERSIZE ) {
6915 * if running in raw sync mode, ISR handler for
6916 * End Of Buffer events terminates all buffers at 4K.
6917 * If this frame size is said to be >4K, get the
6918 * actual number of bytes of the frame in this buffer.
6920 framesize = framesize % DMABUFFERSIZE;
6924 if ( debug_level >= DEBUG_LEVEL_BH )
6925 printk("%s(%d):mgsl_get_raw_rx_frame(%s) status=%04X size=%d\n",
6926 __FILE__,__LINE__,info->device_name,status,framesize);
6928 if ( debug_level >= DEBUG_LEVEL_DATA )
6929 mgsl_trace_block(info,info->rx_buffer_list[CurrentIndex].virt_addr,
6930 min_t(int, framesize, DMABUFFERSIZE),0);
6933 /* copy dma buffer(s) to contiguous intermediate buffer */
6934 /* NOTE: we never copy more than DMABUFFERSIZE bytes */
6936 pBufEntry = &(info->rx_buffer_list[CurrentIndex]);
6937 memcpy( info->intermediate_rxbuffer, pBufEntry->virt_addr, framesize);
6938 info->icount.rxok++;
6940 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6943 /* Free the buffers used by this frame. */
6944 mgsl_free_rx_frame_buffers( info, CurrentIndex, CurrentIndex );
6950 if ( info->rx_enabled && info->rx_overflow ) {
6951 /* The receiver needs to restarted because of
6952 * a receive overflow (buffer or FIFO). If the
6953 * receive buffers are now empty, then restart receiver.
6956 if ( !info->rx_buffer_list[CurrentIndex].status &&
6957 info->rx_buffer_list[CurrentIndex].count ) {
6958 spin_lock_irqsave(&info->irq_spinlock,flags);
6959 usc_start_receiver(info);
6960 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6966 } /* end of mgsl_get_raw_rx_frame() */
6968 /* mgsl_load_tx_dma_buffer()
6970 * Load the transmit DMA buffer with the specified data.
6974 * info pointer to device extension
6975 * Buffer pointer to buffer containing frame to load
6976 * BufferSize size in bytes of frame in Buffer
6978 * Return Value: None
6980 static void mgsl_load_tx_dma_buffer(struct mgsl_struct *info,
6981 const char *Buffer, unsigned int BufferSize)
6983 unsigned short Copycount;
6985 DMABUFFERENTRY *pBufEntry;
6987 if ( debug_level >= DEBUG_LEVEL_DATA )
6988 mgsl_trace_block(info,Buffer, min_t(int, BufferSize, DMABUFFERSIZE), 1);
6990 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
6991 /* set CMR:13 to start transmit when
6992 * next GoAhead (abort) is received
6994 info->cmr_value |= BIT13;
6997 /* begin loading the frame in the next available tx dma
6998 * buffer, remember it's starting location for setting
6999 * up tx dma operation
7001 i = info->current_tx_buffer;
7002 info->start_tx_dma_buffer = i;
7004 /* Setup the status and RCC (Frame Size) fields of the 1st */
7005 /* buffer entry in the transmit DMA buffer list. */
7007 info->tx_buffer_list[i].status = info->cmr_value & 0xf000;
7008 info->tx_buffer_list[i].rcc = BufferSize;
7009 info->tx_buffer_list[i].count = BufferSize;
7011 /* Copy frame data from 1st source buffer to the DMA buffers. */
7012 /* The frame data may span multiple DMA buffers. */
7014 while( BufferSize ){
7015 /* Get a pointer to next DMA buffer entry. */
7016 pBufEntry = &info->tx_buffer_list[i++];
7018 if ( i == info->tx_buffer_count )
7021 /* Calculate the number of bytes that can be copied from */
7022 /* the source buffer to this DMA buffer. */
7023 if ( BufferSize > DMABUFFERSIZE )
7024 Copycount = DMABUFFERSIZE;
7026 Copycount = BufferSize;
7028 /* Actually copy data from source buffer to DMA buffer. */
7029 /* Also set the data count for this individual DMA buffer. */
7030 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
7031 mgsl_load_pci_memory(pBufEntry->virt_addr, Buffer,Copycount);
7033 memcpy(pBufEntry->virt_addr, Buffer, Copycount);
7035 pBufEntry->count = Copycount;
7037 /* Advance source pointer and reduce remaining data count. */
7038 Buffer += Copycount;
7039 BufferSize -= Copycount;
7041 ++info->tx_dma_buffers_used;
7044 /* remember next available tx dma buffer */
7045 info->current_tx_buffer = i;
7047 } /* end of mgsl_load_tx_dma_buffer() */
7050 * mgsl_register_test()
7052 * Performs a register test of the 16C32.
7054 * Arguments: info pointer to device instance data
7055 * Return Value: TRUE if test passed, otherwise FALSE
7057 static BOOLEAN mgsl_register_test( struct mgsl_struct *info )
7059 static unsigned short BitPatterns[] =
7060 { 0x0000, 0xffff, 0xaaaa, 0x5555, 0x1234, 0x6969, 0x9696, 0x0f0f };
7061 static unsigned int Patterncount = sizeof(BitPatterns)/sizeof(unsigned short);
7064 unsigned long flags;
7066 spin_lock_irqsave(&info->irq_spinlock,flags);
7069 /* Verify the reset state of some registers. */
7071 if ( (usc_InReg( info, SICR ) != 0) ||
7072 (usc_InReg( info, IVR ) != 0) ||
7073 (usc_InDmaReg( info, DIVR ) != 0) ){
7078 /* Write bit patterns to various registers but do it out of */
7079 /* sync, then read back and verify values. */
7081 for ( i = 0 ; i < Patterncount ; i++ ) {
7082 usc_OutReg( info, TC0R, BitPatterns[i] );
7083 usc_OutReg( info, TC1R, BitPatterns[(i+1)%Patterncount] );
7084 usc_OutReg( info, TCLR, BitPatterns[(i+2)%Patterncount] );
7085 usc_OutReg( info, RCLR, BitPatterns[(i+3)%Patterncount] );
7086 usc_OutReg( info, RSR, BitPatterns[(i+4)%Patterncount] );
7087 usc_OutDmaReg( info, TBCR, BitPatterns[(i+5)%Patterncount] );
7089 if ( (usc_InReg( info, TC0R ) != BitPatterns[i]) ||
7090 (usc_InReg( info, TC1R ) != BitPatterns[(i+1)%Patterncount]) ||
7091 (usc_InReg( info, TCLR ) != BitPatterns[(i+2)%Patterncount]) ||
7092 (usc_InReg( info, RCLR ) != BitPatterns[(i+3)%Patterncount]) ||
7093 (usc_InReg( info, RSR ) != BitPatterns[(i+4)%Patterncount]) ||
7094 (usc_InDmaReg( info, TBCR ) != BitPatterns[(i+5)%Patterncount]) ){
7102 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7106 } /* end of mgsl_register_test() */
7108 /* mgsl_irq_test() Perform interrupt test of the 16C32.
7110 * Arguments: info pointer to device instance data
7111 * Return Value: TRUE if test passed, otherwise FALSE
7113 static BOOLEAN mgsl_irq_test( struct mgsl_struct *info )
7115 unsigned long EndTime;
7116 unsigned long flags;
7118 spin_lock_irqsave(&info->irq_spinlock,flags);
7122 * Setup 16C32 to interrupt on TxC pin (14MHz clock) transition.
7123 * The ISR sets irq_occurred to 1.
7126 info->irq_occurred = FALSE;
7128 /* Enable INTEN gate for ISA adapter (Port 6, Bit12) */
7129 /* Enable INTEN (Port 6, Bit12) */
7130 /* This connects the IRQ request signal to the ISA bus */
7131 /* on the ISA adapter. This has no effect for the PCI adapter */
7132 usc_OutReg( info, PCR, (unsigned short)((usc_InReg(info, PCR) | BIT13) & ~BIT12) );
7134 usc_EnableMasterIrqBit(info);
7135 usc_EnableInterrupts(info, IO_PIN);
7136 usc_ClearIrqPendingBits(info, IO_PIN);
7138 usc_UnlatchIostatusBits(info, MISCSTATUS_TXC_LATCHED);
7139 usc_EnableStatusIrqs(info, SICR_TXC_ACTIVE + SICR_TXC_INACTIVE);
7141 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7144 while( EndTime-- && !info->irq_occurred ) {
7145 msleep_interruptible(10);
7148 spin_lock_irqsave(&info->irq_spinlock,flags);
7150 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7152 if ( !info->irq_occurred )
7157 } /* end of mgsl_irq_test() */
7161 * Perform a DMA test of the 16C32. A small frame is
7162 * transmitted via DMA from a transmit buffer to a receive buffer
7163 * using single buffer DMA mode.
7165 * Arguments: info pointer to device instance data
7166 * Return Value: TRUE if test passed, otherwise FALSE
7168 static BOOLEAN mgsl_dma_test( struct mgsl_struct *info )
7170 unsigned short FifoLevel;
7171 unsigned long phys_addr;
7172 unsigned int FrameSize;
7176 unsigned short status=0;
7177 unsigned long EndTime;
7178 unsigned long flags;
7179 MGSL_PARAMS tmp_params;
7181 /* save current port options */
7182 memcpy(&tmp_params,&info->params,sizeof(MGSL_PARAMS));
7183 /* load default port options */
7184 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
7186 #define TESTFRAMESIZE 40
7188 spin_lock_irqsave(&info->irq_spinlock,flags);
7190 /* setup 16C32 for SDLC DMA transfer mode */
7193 usc_set_sdlc_mode(info);
7194 usc_enable_loopback(info,1);
7196 /* Reprogram the RDMR so that the 16C32 does NOT clear the count
7197 * field of the buffer entry after fetching buffer address. This
7198 * way we can detect a DMA failure for a DMA read (which should be
7199 * non-destructive to system memory) before we try and write to
7200 * memory (where a failure could corrupt system memory).
7203 /* Receive DMA mode Register (RDMR)
7205 * <15..14> 11 DMA mode = Linked List Buffer mode
7206 * <13> 1 RSBinA/L = store Rx status Block in List entry
7207 * <12> 0 1 = Clear count of List Entry after fetching
7208 * <11..10> 00 Address mode = Increment
7209 * <9> 1 Terminate Buffer on RxBound
7210 * <8> 0 Bus Width = 16bits
7211 * <7..0> ? status Bits (write as 0s)
7213 * 1110 0010 0000 0000 = 0xe200
7216 usc_OutDmaReg( info, RDMR, 0xe200 );
7218 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7221 /* SETUP TRANSMIT AND RECEIVE DMA BUFFERS */
7223 FrameSize = TESTFRAMESIZE;
7225 /* setup 1st transmit buffer entry: */
7226 /* with frame size and transmit control word */
7228 info->tx_buffer_list[0].count = FrameSize;
7229 info->tx_buffer_list[0].rcc = FrameSize;
7230 info->tx_buffer_list[0].status = 0x4000;
7232 /* build a transmit frame in 1st transmit DMA buffer */
7234 TmpPtr = info->tx_buffer_list[0].virt_addr;
7235 for (i = 0; i < FrameSize; i++ )
7238 /* setup 1st receive buffer entry: */
7239 /* clear status, set max receive buffer size */
7241 info->rx_buffer_list[0].status = 0;
7242 info->rx_buffer_list[0].count = FrameSize + 4;
7244 /* zero out the 1st receive buffer */
7246 memset( info->rx_buffer_list[0].virt_addr, 0, FrameSize + 4 );
7248 /* Set count field of next buffer entries to prevent */
7249 /* 16C32 from using buffers after the 1st one. */
7251 info->tx_buffer_list[1].count = 0;
7252 info->rx_buffer_list[1].count = 0;
7255 /***************************/
7256 /* Program 16C32 receiver. */
7257 /***************************/
7259 spin_lock_irqsave(&info->irq_spinlock,flags);
7261 /* setup DMA transfers */
7262 usc_RTCmd( info, RTCmd_PurgeRxFifo );
7264 /* program 16C32 receiver with physical address of 1st DMA buffer entry */
7265 phys_addr = info->rx_buffer_list[0].phys_entry;
7266 usc_OutDmaReg( info, NRARL, (unsigned short)phys_addr );
7267 usc_OutDmaReg( info, NRARU, (unsigned short)(phys_addr >> 16) );
7269 /* Clear the Rx DMA status bits (read RDMR) and start channel */
7270 usc_InDmaReg( info, RDMR );
7271 usc_DmaCmd( info, DmaCmd_InitRxChannel );
7273 /* Enable Receiver (RMR <1..0> = 10) */
7274 usc_OutReg( info, RMR, (unsigned short)((usc_InReg(info, RMR) & 0xfffc) | 0x0002) );
7276 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7279 /*************************************************************/
7280 /* WAIT FOR RECEIVER TO DMA ALL PARAMETERS FROM BUFFER ENTRY */
7281 /*************************************************************/
7283 /* Wait 100ms for interrupt. */
7284 EndTime = jiffies + msecs_to_jiffies(100);
7287 if (time_after(jiffies, EndTime)) {
7292 spin_lock_irqsave(&info->irq_spinlock,flags);
7293 status = usc_InDmaReg( info, RDMR );
7294 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7296 if ( !(status & BIT4) && (status & BIT5) ) {
7297 /* INITG (BIT 4) is inactive (no entry read in progress) AND */
7298 /* BUSY (BIT 5) is active (channel still active). */
7299 /* This means the buffer entry read has completed. */
7305 /******************************/
7306 /* Program 16C32 transmitter. */
7307 /******************************/
7309 spin_lock_irqsave(&info->irq_spinlock,flags);
7311 /* Program the Transmit Character Length Register (TCLR) */
7312 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
7314 usc_OutReg( info, TCLR, (unsigned short)info->tx_buffer_list[0].count );
7315 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7317 /* Program the address of the 1st DMA Buffer Entry in linked list */
7319 phys_addr = info->tx_buffer_list[0].phys_entry;
7320 usc_OutDmaReg( info, NTARL, (unsigned short)phys_addr );
7321 usc_OutDmaReg( info, NTARU, (unsigned short)(phys_addr >> 16) );
7323 /* unlatch Tx status bits, and start transmit channel. */
7325 usc_OutReg( info, TCSR, (unsigned short)(( usc_InReg(info, TCSR) & 0x0f00) | 0xfa) );
7326 usc_DmaCmd( info, DmaCmd_InitTxChannel );
7328 /* wait for DMA controller to fill transmit FIFO */
7330 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
7332 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7335 /**********************************/
7336 /* WAIT FOR TRANSMIT FIFO TO FILL */
7337 /**********************************/
7340 EndTime = jiffies + msecs_to_jiffies(100);
7343 if (time_after(jiffies, EndTime)) {
7348 spin_lock_irqsave(&info->irq_spinlock,flags);
7349 FifoLevel = usc_InReg(info, TICR) >> 8;
7350 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7352 if ( FifoLevel < 16 )
7355 if ( FrameSize < 32 ) {
7356 /* This frame is smaller than the entire transmit FIFO */
7357 /* so wait for the entire frame to be loaded. */
7358 if ( FifoLevel <= (32 - FrameSize) )
7366 /* Enable 16C32 transmitter. */
7368 spin_lock_irqsave(&info->irq_spinlock,flags);
7370 /* Transmit mode Register (TMR), <1..0> = 10, Enable Transmitter */
7371 usc_TCmd( info, TCmd_SendFrame );
7372 usc_OutReg( info, TMR, (unsigned short)((usc_InReg(info, TMR) & 0xfffc) | 0x0002) );
7374 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7377 /******************************/
7378 /* WAIT FOR TRANSMIT COMPLETE */
7379 /******************************/
7382 EndTime = jiffies + msecs_to_jiffies(100);
7384 /* While timer not expired wait for transmit complete */
7386 spin_lock_irqsave(&info->irq_spinlock,flags);
7387 status = usc_InReg( info, TCSR );
7388 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7390 while ( !(status & (BIT6+BIT5+BIT4+BIT2+BIT1)) ) {
7391 if (time_after(jiffies, EndTime)) {
7396 spin_lock_irqsave(&info->irq_spinlock,flags);
7397 status = usc_InReg( info, TCSR );
7398 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7404 /* CHECK FOR TRANSMIT ERRORS */
7405 if ( status & (BIT5 + BIT1) )
7410 /* WAIT FOR RECEIVE COMPLETE */
7413 EndTime = jiffies + msecs_to_jiffies(100);
7415 /* Wait for 16C32 to write receive status to buffer entry. */
7416 status=info->rx_buffer_list[0].status;
7417 while ( status == 0 ) {
7418 if (time_after(jiffies, EndTime)) {
7422 status=info->rx_buffer_list[0].status;
7428 /* CHECK FOR RECEIVE ERRORS */
7429 status = info->rx_buffer_list[0].status;
7431 if ( status & (BIT8 + BIT3 + BIT1) ) {
7432 /* receive error has occurred */
7435 if ( memcmp( info->tx_buffer_list[0].virt_addr ,
7436 info->rx_buffer_list[0].virt_addr, FrameSize ) ){
7442 spin_lock_irqsave(&info->irq_spinlock,flags);
7444 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7446 /* restore current port options */
7447 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
7451 } /* end of mgsl_dma_test() */
7453 /* mgsl_adapter_test()
7455 * Perform the register, IRQ, and DMA tests for the 16C32.
7457 * Arguments: info pointer to device instance data
7458 * Return Value: 0 if success, otherwise -ENODEV
7460 static int mgsl_adapter_test( struct mgsl_struct *info )
7462 if ( debug_level >= DEBUG_LEVEL_INFO )
7463 printk( "%s(%d):Testing device %s\n",
7464 __FILE__,__LINE__,info->device_name );
7466 if ( !mgsl_register_test( info ) ) {
7467 info->init_error = DiagStatus_AddressFailure;
7468 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
7469 __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
7473 if ( !mgsl_irq_test( info ) ) {
7474 info->init_error = DiagStatus_IrqFailure;
7475 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
7476 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
7480 if ( !mgsl_dma_test( info ) ) {
7481 info->init_error = DiagStatus_DmaFailure;
7482 printk( "%s(%d):DMA test failure for device %s DMA=%d\n",
7483 __FILE__,__LINE__,info->device_name, (unsigned short)(info->dma_level) );
7487 if ( debug_level >= DEBUG_LEVEL_INFO )
7488 printk( "%s(%d):device %s passed diagnostics\n",
7489 __FILE__,__LINE__,info->device_name );
7493 } /* end of mgsl_adapter_test() */
7495 /* mgsl_memory_test()
7497 * Test the shared memory on a PCI adapter.
7499 * Arguments: info pointer to device instance data
7500 * Return Value: TRUE if test passed, otherwise FALSE
7502 static BOOLEAN mgsl_memory_test( struct mgsl_struct *info )
7504 static unsigned long BitPatterns[] = { 0x0, 0x55555555, 0xaaaaaaaa,
7505 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
7506 unsigned long Patterncount = sizeof(BitPatterns)/sizeof(unsigned long);
7508 unsigned long TestLimit = SHARED_MEM_ADDRESS_SIZE/sizeof(unsigned long);
7509 unsigned long * TestAddr;
7511 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
7514 TestAddr = (unsigned long *)info->memory_base;
7516 /* Test data lines with test pattern at one location. */
7518 for ( i = 0 ; i < Patterncount ; i++ ) {
7519 *TestAddr = BitPatterns[i];
7520 if ( *TestAddr != BitPatterns[i] )
7524 /* Test address lines with incrementing pattern over */
7525 /* entire address range. */
7527 for ( i = 0 ; i < TestLimit ; i++ ) {
7532 TestAddr = (unsigned long *)info->memory_base;
7534 for ( i = 0 ; i < TestLimit ; i++ ) {
7535 if ( *TestAddr != i * 4 )
7540 memset( info->memory_base, 0, SHARED_MEM_ADDRESS_SIZE );
7544 } /* End Of mgsl_memory_test() */
7547 /* mgsl_load_pci_memory()
7549 * Load a large block of data into the PCI shared memory.
7550 * Use this instead of memcpy() or memmove() to move data
7551 * into the PCI shared memory.
7555 * This function prevents the PCI9050 interface chip from hogging
7556 * the adapter local bus, which can starve the 16C32 by preventing
7557 * 16C32 bus master cycles.
7559 * The PCI9050 documentation says that the 9050 will always release
7560 * control of the local bus after completing the current read
7561 * or write operation.
7563 * It appears that as long as the PCI9050 write FIFO is full, the
7564 * PCI9050 treats all of the writes as a single burst transaction
7565 * and will not release the bus. This causes DMA latency problems
7566 * at high speeds when copying large data blocks to the shared
7569 * This function in effect, breaks the a large shared memory write
7570 * into multiple transations by interleaving a shared memory read
7571 * which will flush the write FIFO and 'complete' the write
7572 * transation. This allows any pending DMA request to gain control
7573 * of the local bus in a timely fasion.
7577 * TargetPtr pointer to target address in PCI shared memory
7578 * SourcePtr pointer to source buffer for data
7579 * count count in bytes of data to copy
7581 * Return Value: None
7583 static void mgsl_load_pci_memory( char* TargetPtr, const char* SourcePtr,
7584 unsigned short count )
7586 /* 16 32-bit writes @ 60ns each = 960ns max latency on local bus */
7587 #define PCI_LOAD_INTERVAL 64
7589 unsigned short Intervalcount = count / PCI_LOAD_INTERVAL;
7590 unsigned short Index;
7591 unsigned long Dummy;
7593 for ( Index = 0 ; Index < Intervalcount ; Index++ )
7595 memcpy(TargetPtr, SourcePtr, PCI_LOAD_INTERVAL);
7596 Dummy = *((volatile unsigned long *)TargetPtr);
7597 TargetPtr += PCI_LOAD_INTERVAL;
7598 SourcePtr += PCI_LOAD_INTERVAL;
7601 memcpy( TargetPtr, SourcePtr, count % PCI_LOAD_INTERVAL );
7603 } /* End Of mgsl_load_pci_memory() */
7605 static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit)
7610 printk("%s tx data:\n",info->device_name);
7612 printk("%s rx data:\n",info->device_name);
7620 for(i=0;i<linecount;i++)
7621 printk("%02X ",(unsigned char)data[i]);
7624 for(i=0;i<linecount;i++) {
7625 if (data[i]>=040 && data[i]<=0176)
7626 printk("%c",data[i]);
7635 } /* end of mgsl_trace_block() */
7637 /* mgsl_tx_timeout()
7639 * called when HDLC frame times out
7640 * update stats and do tx completion processing
7642 * Arguments: context pointer to device instance data
7643 * Return Value: None
7645 static void mgsl_tx_timeout(unsigned long context)
7647 struct mgsl_struct *info = (struct mgsl_struct*)context;
7648 unsigned long flags;
7650 if ( debug_level >= DEBUG_LEVEL_INFO )
7651 printk( "%s(%d):mgsl_tx_timeout(%s)\n",
7652 __FILE__,__LINE__,info->device_name);
7653 if(info->tx_active &&
7654 (info->params.mode == MGSL_MODE_HDLC ||
7655 info->params.mode == MGSL_MODE_RAW) ) {
7656 info->icount.txtimeout++;
7658 spin_lock_irqsave(&info->irq_spinlock,flags);
7659 info->tx_active = 0;
7660 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
7662 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
7663 usc_loopmode_cancel_transmit( info );
7665 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7669 hdlcdev_tx_done(info);
7672 mgsl_bh_transmit(info);
7674 } /* end of mgsl_tx_timeout() */
7676 /* signal that there are no more frames to send, so that
7677 * line is 'released' by echoing RxD to TxD when current
7678 * transmission is complete (or immediately if no tx in progress).
7680 static int mgsl_loopmode_send_done( struct mgsl_struct * info )
7682 unsigned long flags;
7684 spin_lock_irqsave(&info->irq_spinlock,flags);
7685 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
7686 if (info->tx_active)
7687 info->loopmode_send_done_requested = TRUE;
7689 usc_loopmode_send_done(info);
7691 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7696 /* release the line by echoing RxD to TxD
7697 * upon completion of a transmit frame
7699 static void usc_loopmode_send_done( struct mgsl_struct * info )
7701 info->loopmode_send_done_requested = FALSE;
7702 /* clear CMR:13 to 0 to start echoing RxData to TxData */
7703 info->cmr_value &= ~BIT13;
7704 usc_OutReg(info, CMR, info->cmr_value);
7707 /* abort a transmit in progress while in HDLC LoopMode
7709 static void usc_loopmode_cancel_transmit( struct mgsl_struct * info )
7711 /* reset tx dma channel and purge TxFifo */
7712 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7713 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
7714 usc_loopmode_send_done( info );
7717 /* for HDLC/SDLC LoopMode, setting CMR:13 after the transmitter is enabled
7718 * is an Insert Into Loop action. Upon receipt of a GoAhead sequence (RxAbort)
7719 * we must clear CMR:13 to begin repeating TxData to RxData
7721 static void usc_loopmode_insert_request( struct mgsl_struct * info )
7723 info->loopmode_insert_requested = TRUE;
7725 /* enable RxAbort irq. On next RxAbort, clear CMR:13 to
7726 * begin repeating TxData on RxData (complete insertion)
7728 usc_OutReg( info, RICR,
7729 (usc_InReg( info, RICR ) | RXSTATUS_ABORT_RECEIVED ) );
7731 /* set CMR:13 to insert into loop on next GoAhead (RxAbort) */
7732 info->cmr_value |= BIT13;
7733 usc_OutReg(info, CMR, info->cmr_value);
7736 /* return 1 if station is inserted into the loop, otherwise 0
7738 static int usc_loopmode_active( struct mgsl_struct * info)
7740 return usc_InReg( info, CCSR ) & BIT7 ? 1 : 0 ;
7746 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
7747 * set encoding and frame check sequence (FCS) options
7749 * dev pointer to network device structure
7750 * encoding serial encoding setting
7751 * parity FCS setting
7753 * returns 0 if success, otherwise error code
7755 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
7756 unsigned short parity)
7758 struct mgsl_struct *info = dev_to_port(dev);
7759 unsigned char new_encoding;
7760 unsigned short new_crctype;
7762 /* return error if TTY interface open */
7768 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
7769 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
7770 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
7771 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
7772 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
7773 default: return -EINVAL;
7778 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
7779 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
7780 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
7781 default: return -EINVAL;
7784 info->params.encoding = new_encoding;
7785 info->params.crc_type = new_crctype;;
7787 /* if network interface up, reprogram hardware */
7789 mgsl_program_hw(info);
7795 * called by generic HDLC layer to send frame
7797 * skb socket buffer containing HDLC frame
7798 * dev pointer to network device structure
7800 * returns 0 if success, otherwise error code
7802 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
7804 struct mgsl_struct *info = dev_to_port(dev);
7805 struct net_device_stats *stats = hdlc_stats(dev);
7806 unsigned long flags;
7808 if (debug_level >= DEBUG_LEVEL_INFO)
7809 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
7811 /* stop sending until this frame completes */
7812 netif_stop_queue(dev);
7814 /* copy data to device buffers */
7815 info->xmit_cnt = skb->len;
7816 mgsl_load_tx_dma_buffer(info, skb->data, skb->len);
7818 /* update network statistics */
7819 stats->tx_packets++;
7820 stats->tx_bytes += skb->len;
7822 /* done with socket buffer, so free it */
7825 /* save start time for transmit timeout detection */
7826 dev->trans_start = jiffies;
7828 /* start hardware transmitter if necessary */
7829 spin_lock_irqsave(&info->irq_spinlock,flags);
7830 if (!info->tx_active)
7831 usc_start_transmitter(info);
7832 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7838 * called by network layer when interface enabled
7839 * claim resources and initialize hardware
7841 * dev pointer to network device structure
7843 * returns 0 if success, otherwise error code
7845 static int hdlcdev_open(struct net_device *dev)
7847 struct mgsl_struct *info = dev_to_port(dev);
7849 unsigned long flags;
7851 if (debug_level >= DEBUG_LEVEL_INFO)
7852 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
7854 /* generic HDLC layer open processing */
7855 if ((rc = hdlc_open(dev)))
7858 /* arbitrate between network and tty opens */
7859 spin_lock_irqsave(&info->netlock, flags);
7860 if (info->count != 0 || info->netcount != 0) {
7861 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
7862 spin_unlock_irqrestore(&info->netlock, flags);
7866 spin_unlock_irqrestore(&info->netlock, flags);
7868 /* claim resources and init adapter */
7869 if ((rc = startup(info)) != 0) {
7870 spin_lock_irqsave(&info->netlock, flags);
7872 spin_unlock_irqrestore(&info->netlock, flags);
7876 /* assert DTR and RTS, apply hardware settings */
7877 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
7878 mgsl_program_hw(info);
7880 /* enable network layer transmit */
7881 dev->trans_start = jiffies;
7882 netif_start_queue(dev);
7884 /* inform generic HDLC layer of current DCD status */
7885 spin_lock_irqsave(&info->irq_spinlock, flags);
7886 usc_get_serial_signals(info);
7887 spin_unlock_irqrestore(&info->irq_spinlock, flags);
7888 hdlc_set_carrier(info->serial_signals & SerialSignal_DCD, dev);
7894 * called by network layer when interface is disabled
7895 * shutdown hardware and release resources
7897 * dev pointer to network device structure
7899 * returns 0 if success, otherwise error code
7901 static int hdlcdev_close(struct net_device *dev)
7903 struct mgsl_struct *info = dev_to_port(dev);
7904 unsigned long flags;
7906 if (debug_level >= DEBUG_LEVEL_INFO)
7907 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
7909 netif_stop_queue(dev);
7911 /* shutdown adapter and release resources */
7916 spin_lock_irqsave(&info->netlock, flags);
7918 spin_unlock_irqrestore(&info->netlock, flags);
7924 * called by network layer to process IOCTL call to network device
7926 * dev pointer to network device structure
7927 * ifr pointer to network interface request structure
7928 * cmd IOCTL command code
7930 * returns 0 if success, otherwise error code
7932 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
7934 const size_t size = sizeof(sync_serial_settings);
7935 sync_serial_settings new_line;
7936 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
7937 struct mgsl_struct *info = dev_to_port(dev);
7940 if (debug_level >= DEBUG_LEVEL_INFO)
7941 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
7943 /* return error if TTY interface open */
7947 if (cmd != SIOCWANDEV)
7948 return hdlc_ioctl(dev, ifr, cmd);
7950 switch(ifr->ifr_settings.type) {
7951 case IF_GET_IFACE: /* return current sync_serial_settings */
7953 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
7954 if (ifr->ifr_settings.size < size) {
7955 ifr->ifr_settings.size = size; /* data size wanted */
7959 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7960 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7961 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7962 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7965 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
7966 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
7967 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
7968 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
7969 default: new_line.clock_type = CLOCK_DEFAULT;
7972 new_line.clock_rate = info->params.clock_speed;
7973 new_line.loopback = info->params.loopback ? 1:0;
7975 if (copy_to_user(line, &new_line, size))
7979 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
7981 if(!capable(CAP_NET_ADMIN))
7983 if (copy_from_user(&new_line, line, size))
7986 switch (new_line.clock_type)
7988 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
7989 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
7990 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
7991 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
7992 case CLOCK_DEFAULT: flags = info->params.flags &
7993 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7994 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7995 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7996 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
7997 default: return -EINVAL;
8000 if (new_line.loopback != 0 && new_line.loopback != 1)
8003 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
8004 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
8005 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
8006 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
8007 info->params.flags |= flags;
8009 info->params.loopback = new_line.loopback;
8011 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
8012 info->params.clock_speed = new_line.clock_rate;
8014 info->params.clock_speed = 0;
8016 /* if network interface up, reprogram hardware */
8018 mgsl_program_hw(info);
8022 return hdlc_ioctl(dev, ifr, cmd);
8027 * called by network layer when transmit timeout is detected
8029 * dev pointer to network device structure
8031 static void hdlcdev_tx_timeout(struct net_device *dev)
8033 struct mgsl_struct *info = dev_to_port(dev);
8034 struct net_device_stats *stats = hdlc_stats(dev);
8035 unsigned long flags;
8037 if (debug_level >= DEBUG_LEVEL_INFO)
8038 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
8041 stats->tx_aborted_errors++;
8043 spin_lock_irqsave(&info->irq_spinlock,flags);
8044 usc_stop_transmitter(info);
8045 spin_unlock_irqrestore(&info->irq_spinlock,flags);
8047 netif_wake_queue(dev);
8051 * called by device driver when transmit completes
8052 * reenable network layer transmit if stopped
8054 * info pointer to device instance information
8056 static void hdlcdev_tx_done(struct mgsl_struct *info)
8058 if (netif_queue_stopped(info->netdev))
8059 netif_wake_queue(info->netdev);
8063 * called by device driver when frame received
8064 * pass frame to network layer
8066 * info pointer to device instance information
8067 * buf pointer to buffer contianing frame data
8068 * size count of data bytes in buf
8070 static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size)
8072 struct sk_buff *skb = dev_alloc_skb(size);
8073 struct net_device *dev = info->netdev;
8074 struct net_device_stats *stats = hdlc_stats(dev);
8076 if (debug_level >= DEBUG_LEVEL_INFO)
8077 printk("hdlcdev_rx(%s)\n",dev->name);
8080 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
8081 stats->rx_dropped++;
8085 memcpy(skb_put(skb, size),buf,size);
8087 skb->protocol = hdlc_type_trans(skb, info->netdev);
8089 stats->rx_packets++;
8090 stats->rx_bytes += size;
8094 info->netdev->last_rx = jiffies;
8098 * called by device driver when adding device instance
8099 * do generic HDLC initialization
8101 * info pointer to device instance information
8103 * returns 0 if success, otherwise error code
8105 static int hdlcdev_init(struct mgsl_struct *info)
8108 struct net_device *dev;
8111 /* allocate and initialize network and HDLC layer objects */
8113 if (!(dev = alloc_hdlcdev(info))) {
8114 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
8118 /* for network layer reporting purposes only */
8119 dev->base_addr = info->io_base;
8120 dev->irq = info->irq_level;
8121 dev->dma = info->dma_level;
8123 /* network layer callbacks and settings */
8124 dev->do_ioctl = hdlcdev_ioctl;
8125 dev->open = hdlcdev_open;
8126 dev->stop = hdlcdev_close;
8127 dev->tx_timeout = hdlcdev_tx_timeout;
8128 dev->watchdog_timeo = 10*HZ;
8129 dev->tx_queue_len = 50;
8131 /* generic HDLC layer callbacks and settings */
8132 hdlc = dev_to_hdlc(dev);
8133 hdlc->attach = hdlcdev_attach;
8134 hdlc->xmit = hdlcdev_xmit;
8136 /* register objects with HDLC layer */
8137 if ((rc = register_hdlc_device(dev))) {
8138 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
8148 * called by device driver when removing device instance
8149 * do generic HDLC cleanup
8151 * info pointer to device instance information
8153 static void hdlcdev_exit(struct mgsl_struct *info)
8155 unregister_hdlc_device(info->netdev);
8156 free_netdev(info->netdev);
8157 info->netdev = NULL;
8160 #endif /* CONFIG_HDLC */
8163 static int __devinit synclink_init_one (struct pci_dev *dev,
8164 const struct pci_device_id *ent)
8166 struct mgsl_struct *info;
8168 if (pci_enable_device(dev)) {
8169 printk("error enabling pci device %p\n", dev);
8173 if (!(info = mgsl_allocate_device())) {
8174 printk("can't allocate device instance data.\n");
8178 /* Copy user configuration info to device instance data */
8180 info->io_base = pci_resource_start(dev, 2);
8181 info->irq_level = dev->irq;
8182 info->phys_memory_base = pci_resource_start(dev, 3);
8184 /* Because veremap only works on page boundaries we must map
8185 * a larger area than is actually implemented for the LCR
8186 * memory range. We map a full page starting at the page boundary.
8188 info->phys_lcr_base = pci_resource_start(dev, 0);
8189 info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
8190 info->phys_lcr_base &= ~(PAGE_SIZE-1);
8192 info->bus_type = MGSL_BUS_TYPE_PCI;
8193 info->io_addr_size = 8;
8194 info->irq_flags = SA_SHIRQ;
8196 if (dev->device == 0x0210) {
8197 /* Version 1 PCI9030 based universal PCI adapter */
8198 info->misc_ctrl_value = 0x007c4080;
8199 info->hw_version = 1;
8201 /* Version 0 PCI9050 based 5V PCI adapter
8202 * A PCI9050 bug prevents reading LCR registers if
8203 * LCR base address bit 7 is set. Maintain shadow
8204 * value so we can write to LCR misc control reg.
8206 info->misc_ctrl_value = 0x087e4546;
8207 info->hw_version = 0;
8210 mgsl_add_device(info);
8215 static void __devexit synclink_remove_one (struct pci_dev *dev)