2 * linux/drivers/char/synclink.c
4 * $Id: synclink.c,v 4.38 2005/11/07 16:30:34 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>
104 #include <linux/dma-mapping.h>
106 #ifdef CONFIG_HDLC_MODULE
107 #define CONFIG_HDLC 1
110 #define GET_USER(error,value,addr) error = get_user(value,addr)
111 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
112 #define PUT_USER(error,value,addr) error = put_user(value,addr)
113 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
115 #include <asm/uaccess.h>
117 #include "linux/synclink.h"
119 #define RCLRVALUE 0xffff
121 static MGSL_PARAMS default_params = {
122 MGSL_MODE_HDLC, /* unsigned long mode */
123 0, /* unsigned char loopback; */
124 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
125 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
126 0, /* unsigned long clock_speed; */
127 0xff, /* unsigned char addr_filter; */
128 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
129 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
130 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
131 9600, /* unsigned long data_rate; */
132 8, /* unsigned char data_bits; */
133 1, /* unsigned char stop_bits; */
134 ASYNC_PARITY_NONE /* unsigned char parity; */
137 #define SHARED_MEM_ADDRESS_SIZE 0x40000
138 #define BUFFERLISTSIZE (PAGE_SIZE)
139 #define DMABUFFERSIZE (PAGE_SIZE)
140 #define MAXRXFRAMES 7
142 typedef struct _DMABUFFERENTRY
144 u32 phys_addr; /* 32-bit flat physical address of data buffer */
145 volatile u16 count; /* buffer size/data count */
146 volatile u16 status; /* Control/status field */
147 volatile u16 rcc; /* character count field */
148 u16 reserved; /* padding required by 16C32 */
149 u32 link; /* 32-bit flat link to next buffer entry */
150 char *virt_addr; /* virtual address of data buffer */
151 u32 phys_entry; /* physical address of this buffer entry */
153 } DMABUFFERENTRY, *DMAPBUFFERENTRY;
155 /* The queue of BH actions to be performed */
158 #define BH_TRANSMIT 2
161 #define IO_PIN_SHUTDOWN_LIMIT 100
163 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
165 struct _input_signal_events {
176 /* transmit holding buffer definitions*/
177 #define MAX_TX_HOLDING_BUFFERS 5
178 struct tx_holding_buffer {
180 unsigned char * buffer;
185 * Device instance data structure
191 int count; /* count of opens */
194 unsigned short close_delay;
195 unsigned short closing_wait; /* time to wait before closing */
197 struct mgsl_icount icount;
199 struct tty_struct *tty;
201 int x_char; /* xon/xoff character */
202 int blocked_open; /* # of blocked opens */
203 u16 read_status_mask;
204 u16 ignore_status_mask;
205 unsigned char *xmit_buf;
210 wait_queue_head_t open_wait;
211 wait_queue_head_t close_wait;
213 wait_queue_head_t status_event_wait_q;
214 wait_queue_head_t event_wait_q;
215 struct timer_list tx_timer; /* HDLC transmit timeout timer */
216 struct mgsl_struct *next_device; /* device list link */
218 spinlock_t irq_spinlock; /* spinlock for synchronizing with ISR */
219 struct work_struct task; /* task structure for scheduling bh */
221 u32 EventMask; /* event trigger mask */
222 u32 RecordedEvents; /* pending events */
224 u32 max_frame_size; /* as set by device config */
228 int bh_running; /* Protection from multiple */
232 int dcd_chkcount; /* check counts to prevent */
233 int cts_chkcount; /* too many IRQs if a signal */
234 int dsr_chkcount; /* is floating */
237 char *buffer_list; /* virtual address of Rx & Tx buffer lists */
238 u32 buffer_list_phys;
239 dma_addr_t buffer_list_dma_addr;
241 unsigned int rx_buffer_count; /* count of total allocated Rx buffers */
242 DMABUFFERENTRY *rx_buffer_list; /* list of receive buffer entries */
243 unsigned int current_rx_buffer;
245 int num_tx_dma_buffers; /* number of tx dma frames required */
246 int tx_dma_buffers_used;
247 unsigned int tx_buffer_count; /* count of total allocated Tx buffers */
248 DMABUFFERENTRY *tx_buffer_list; /* list of transmit buffer entries */
249 int start_tx_dma_buffer; /* tx dma buffer to start tx dma operation */
250 int current_tx_buffer; /* next tx dma buffer to be loaded */
252 unsigned char *intermediate_rxbuffer;
254 int num_tx_holding_buffers; /* number of tx holding buffer allocated */
255 int get_tx_holding_index; /* next tx holding buffer for adapter to load */
256 int put_tx_holding_index; /* next tx holding buffer to store user request */
257 int tx_holding_count; /* number of tx holding buffers waiting */
258 struct tx_holding_buffer tx_holding_buffers[MAX_TX_HOLDING_BUFFERS];
271 char device_name[25]; /* device instance name */
273 unsigned int bus_type; /* expansion bus type (ISA,EISA,PCI) */
274 unsigned char bus; /* expansion bus number (zero based) */
275 unsigned char function; /* PCI device number */
277 unsigned int io_base; /* base I/O address of adapter */
278 unsigned int io_addr_size; /* size of the I/O address range */
279 int io_addr_requested; /* nonzero if I/O address requested */
281 unsigned int irq_level; /* interrupt level */
282 unsigned long irq_flags;
283 int irq_requested; /* nonzero if IRQ requested */
285 unsigned int dma_level; /* DMA channel */
286 int dma_requested; /* nonzero if dma channel requested */
292 MGSL_PARAMS params; /* communications parameters */
294 unsigned char serial_signals; /* current serial signal states */
296 int irq_occurred; /* for diagnostics use */
297 unsigned int init_error; /* Initialization startup error (DIAGS) */
298 int fDiagnosticsmode; /* Driver in Diagnostic mode? (DIAGS) */
301 unsigned char* memory_base; /* shared memory address (PCI only) */
302 u32 phys_memory_base;
303 int shared_mem_requested;
305 unsigned char* lcr_base; /* local config registers (PCI only) */
308 int lcr_mem_requested;
311 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
312 char char_buf[MAX_ASYNC_BUFFER_SIZE];
313 BOOLEAN drop_rts_on_tx_done;
315 BOOLEAN loopmode_insert_requested;
316 BOOLEAN loopmode_send_done_requested;
318 struct _input_signal_events input_signal_events;
320 /* generic HDLC device parts */
326 struct net_device *netdev;
330 #define MGSL_MAGIC 0x5401
333 * The size of the serial xmit buffer is 1 page, or 4096 bytes
335 #ifndef SERIAL_XMIT_SIZE
336 #define SERIAL_XMIT_SIZE 4096
340 * These macros define the offsets used in calculating the
341 * I/O address of the specified USC registers.
345 #define DCPIN 2 /* Bit 1 of I/O address */
346 #define SDPIN 4 /* Bit 2 of I/O address */
348 #define DCAR 0 /* DMA command/address register */
349 #define CCAR SDPIN /* channel command/address register */
350 #define DATAREG DCPIN + SDPIN /* serial data register */
355 * These macros define the register address (ordinal number)
356 * used for writing address/value pairs to the USC.
359 #define CMR 0x02 /* Channel mode Register */
360 #define CCSR 0x04 /* Channel Command/status Register */
361 #define CCR 0x06 /* Channel Control Register */
362 #define PSR 0x08 /* Port status Register */
363 #define PCR 0x0a /* Port Control Register */
364 #define TMDR 0x0c /* Test mode Data Register */
365 #define TMCR 0x0e /* Test mode Control Register */
366 #define CMCR 0x10 /* Clock mode Control Register */
367 #define HCR 0x12 /* Hardware Configuration Register */
368 #define IVR 0x14 /* Interrupt Vector Register */
369 #define IOCR 0x16 /* Input/Output Control Register */
370 #define ICR 0x18 /* Interrupt Control Register */
371 #define DCCR 0x1a /* Daisy Chain Control Register */
372 #define MISR 0x1c /* Misc Interrupt status Register */
373 #define SICR 0x1e /* status Interrupt Control Register */
374 #define RDR 0x20 /* Receive Data Register */
375 #define RMR 0x22 /* Receive mode Register */
376 #define RCSR 0x24 /* Receive Command/status Register */
377 #define RICR 0x26 /* Receive Interrupt Control Register */
378 #define RSR 0x28 /* Receive Sync Register */
379 #define RCLR 0x2a /* Receive count Limit Register */
380 #define RCCR 0x2c /* Receive Character count Register */
381 #define TC0R 0x2e /* Time Constant 0 Register */
382 #define TDR 0x30 /* Transmit Data Register */
383 #define TMR 0x32 /* Transmit mode Register */
384 #define TCSR 0x34 /* Transmit Command/status Register */
385 #define TICR 0x36 /* Transmit Interrupt Control Register */
386 #define TSR 0x38 /* Transmit Sync Register */
387 #define TCLR 0x3a /* Transmit count Limit Register */
388 #define TCCR 0x3c /* Transmit Character count Register */
389 #define TC1R 0x3e /* Time Constant 1 Register */
393 * MACRO DEFINITIONS FOR DMA REGISTERS
396 #define DCR 0x06 /* DMA Control Register (shared) */
397 #define DACR 0x08 /* DMA Array count Register (shared) */
398 #define BDCR 0x12 /* Burst/Dwell Control Register (shared) */
399 #define DIVR 0x14 /* DMA Interrupt Vector Register (shared) */
400 #define DICR 0x18 /* DMA Interrupt Control Register (shared) */
401 #define CDIR 0x1a /* Clear DMA Interrupt Register (shared) */
402 #define SDIR 0x1c /* Set DMA Interrupt Register (shared) */
404 #define TDMR 0x02 /* Transmit DMA mode Register */
405 #define TDIAR 0x1e /* Transmit DMA Interrupt Arm Register */
406 #define TBCR 0x2a /* Transmit Byte count Register */
407 #define TARL 0x2c /* Transmit Address Register (low) */
408 #define TARU 0x2e /* Transmit Address Register (high) */
409 #define NTBCR 0x3a /* Next Transmit Byte count Register */
410 #define NTARL 0x3c /* Next Transmit Address Register (low) */
411 #define NTARU 0x3e /* Next Transmit Address Register (high) */
413 #define RDMR 0x82 /* Receive DMA mode Register (non-shared) */
414 #define RDIAR 0x9e /* Receive DMA Interrupt Arm Register */
415 #define RBCR 0xaa /* Receive Byte count Register */
416 #define RARL 0xac /* Receive Address Register (low) */
417 #define RARU 0xae /* Receive Address Register (high) */
418 #define NRBCR 0xba /* Next Receive Byte count Register */
419 #define NRARL 0xbc /* Next Receive Address Register (low) */
420 #define NRARU 0xbe /* Next Receive Address Register (high) */
424 * MACRO DEFINITIONS FOR MODEM STATUS BITS
427 #define MODEMSTATUS_DTR 0x80
428 #define MODEMSTATUS_DSR 0x40
429 #define MODEMSTATUS_RTS 0x20
430 #define MODEMSTATUS_CTS 0x10
431 #define MODEMSTATUS_RI 0x04
432 #define MODEMSTATUS_DCD 0x01
436 * Channel Command/Address Register (CCAR) Command Codes
439 #define RTCmd_Null 0x0000
440 #define RTCmd_ResetHighestIus 0x1000
441 #define RTCmd_TriggerChannelLoadDma 0x2000
442 #define RTCmd_TriggerRxDma 0x2800
443 #define RTCmd_TriggerTxDma 0x3000
444 #define RTCmd_TriggerRxAndTxDma 0x3800
445 #define RTCmd_PurgeRxFifo 0x4800
446 #define RTCmd_PurgeTxFifo 0x5000
447 #define RTCmd_PurgeRxAndTxFifo 0x5800
448 #define RTCmd_LoadRcc 0x6800
449 #define RTCmd_LoadTcc 0x7000
450 #define RTCmd_LoadRccAndTcc 0x7800
451 #define RTCmd_LoadTC0 0x8800
452 #define RTCmd_LoadTC1 0x9000
453 #define RTCmd_LoadTC0AndTC1 0x9800
454 #define RTCmd_SerialDataLSBFirst 0xa000
455 #define RTCmd_SerialDataMSBFirst 0xa800
456 #define RTCmd_SelectBigEndian 0xb000
457 #define RTCmd_SelectLittleEndian 0xb800
461 * DMA Command/Address Register (DCAR) Command Codes
464 #define DmaCmd_Null 0x0000
465 #define DmaCmd_ResetTxChannel 0x1000
466 #define DmaCmd_ResetRxChannel 0x1200
467 #define DmaCmd_StartTxChannel 0x2000
468 #define DmaCmd_StartRxChannel 0x2200
469 #define DmaCmd_ContinueTxChannel 0x3000
470 #define DmaCmd_ContinueRxChannel 0x3200
471 #define DmaCmd_PauseTxChannel 0x4000
472 #define DmaCmd_PauseRxChannel 0x4200
473 #define DmaCmd_AbortTxChannel 0x5000
474 #define DmaCmd_AbortRxChannel 0x5200
475 #define DmaCmd_InitTxChannel 0x7000
476 #define DmaCmd_InitRxChannel 0x7200
477 #define DmaCmd_ResetHighestDmaIus 0x8000
478 #define DmaCmd_ResetAllChannels 0x9000
479 #define DmaCmd_StartAllChannels 0xa000
480 #define DmaCmd_ContinueAllChannels 0xb000
481 #define DmaCmd_PauseAllChannels 0xc000
482 #define DmaCmd_AbortAllChannels 0xd000
483 #define DmaCmd_InitAllChannels 0xf000
485 #define TCmd_Null 0x0000
486 #define TCmd_ClearTxCRC 0x2000
487 #define TCmd_SelectTicrTtsaData 0x4000
488 #define TCmd_SelectTicrTxFifostatus 0x5000
489 #define TCmd_SelectTicrIntLevel 0x6000
490 #define TCmd_SelectTicrdma_level 0x7000
491 #define TCmd_SendFrame 0x8000
492 #define TCmd_SendAbort 0x9000
493 #define TCmd_EnableDleInsertion 0xc000
494 #define TCmd_DisableDleInsertion 0xd000
495 #define TCmd_ClearEofEom 0xe000
496 #define TCmd_SetEofEom 0xf000
498 #define RCmd_Null 0x0000
499 #define RCmd_ClearRxCRC 0x2000
500 #define RCmd_EnterHuntmode 0x3000
501 #define RCmd_SelectRicrRtsaData 0x4000
502 #define RCmd_SelectRicrRxFifostatus 0x5000
503 #define RCmd_SelectRicrIntLevel 0x6000
504 #define RCmd_SelectRicrdma_level 0x7000
507 * Bits for enabling and disabling IRQs in Interrupt Control Register (ICR)
510 #define RECEIVE_STATUS BIT5
511 #define RECEIVE_DATA BIT4
512 #define TRANSMIT_STATUS BIT3
513 #define TRANSMIT_DATA BIT2
519 * Receive status Bits in Receive Command/status Register RCSR
522 #define RXSTATUS_SHORT_FRAME BIT8
523 #define RXSTATUS_CODE_VIOLATION BIT8
524 #define RXSTATUS_EXITED_HUNT BIT7
525 #define RXSTATUS_IDLE_RECEIVED BIT6
526 #define RXSTATUS_BREAK_RECEIVED BIT5
527 #define RXSTATUS_ABORT_RECEIVED BIT5
528 #define RXSTATUS_RXBOUND BIT4
529 #define RXSTATUS_CRC_ERROR BIT3
530 #define RXSTATUS_FRAMING_ERROR BIT3
531 #define RXSTATUS_ABORT BIT2
532 #define RXSTATUS_PARITY_ERROR BIT2
533 #define RXSTATUS_OVERRUN BIT1
534 #define RXSTATUS_DATA_AVAILABLE BIT0
535 #define RXSTATUS_ALL 0x01f6
536 #define usc_UnlatchRxstatusBits(a,b) usc_OutReg( (a), RCSR, (u16)((b) & RXSTATUS_ALL) )
539 * Values for setting transmit idle mode in
540 * Transmit Control/status Register (TCSR)
542 #define IDLEMODE_FLAGS 0x0000
543 #define IDLEMODE_ALT_ONE_ZERO 0x0100
544 #define IDLEMODE_ZERO 0x0200
545 #define IDLEMODE_ONE 0x0300
546 #define IDLEMODE_ALT_MARK_SPACE 0x0500
547 #define IDLEMODE_SPACE 0x0600
548 #define IDLEMODE_MARK 0x0700
549 #define IDLEMODE_MASK 0x0700
552 * IUSC revision identifiers
554 #define IUSC_SL1660 0x4d44
555 #define IUSC_PRE_SL1660 0x4553
558 * Transmit status Bits in Transmit Command/status Register (TCSR)
561 #define TCSR_PRESERVE 0x0F00
563 #define TCSR_UNDERWAIT BIT11
564 #define TXSTATUS_PREAMBLE_SENT BIT7
565 #define TXSTATUS_IDLE_SENT BIT6
566 #define TXSTATUS_ABORT_SENT BIT5
567 #define TXSTATUS_EOF_SENT BIT4
568 #define TXSTATUS_EOM_SENT BIT4
569 #define TXSTATUS_CRC_SENT BIT3
570 #define TXSTATUS_ALL_SENT BIT2
571 #define TXSTATUS_UNDERRUN BIT1
572 #define TXSTATUS_FIFO_EMPTY BIT0
573 #define TXSTATUS_ALL 0x00fa
574 #define usc_UnlatchTxstatusBits(a,b) usc_OutReg( (a), TCSR, (u16)((a)->tcsr_value + ((b) & 0x00FF)) )
577 #define MISCSTATUS_RXC_LATCHED BIT15
578 #define MISCSTATUS_RXC BIT14
579 #define MISCSTATUS_TXC_LATCHED BIT13
580 #define MISCSTATUS_TXC BIT12
581 #define MISCSTATUS_RI_LATCHED BIT11
582 #define MISCSTATUS_RI BIT10
583 #define MISCSTATUS_DSR_LATCHED BIT9
584 #define MISCSTATUS_DSR BIT8
585 #define MISCSTATUS_DCD_LATCHED BIT7
586 #define MISCSTATUS_DCD BIT6
587 #define MISCSTATUS_CTS_LATCHED BIT5
588 #define MISCSTATUS_CTS BIT4
589 #define MISCSTATUS_RCC_UNDERRUN BIT3
590 #define MISCSTATUS_DPLL_NO_SYNC BIT2
591 #define MISCSTATUS_BRG1_ZERO BIT1
592 #define MISCSTATUS_BRG0_ZERO BIT0
594 #define usc_UnlatchIostatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0xaaa0))
595 #define usc_UnlatchMiscstatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0x000f))
597 #define SICR_RXC_ACTIVE BIT15
598 #define SICR_RXC_INACTIVE BIT14
599 #define SICR_RXC (BIT15+BIT14)
600 #define SICR_TXC_ACTIVE BIT13
601 #define SICR_TXC_INACTIVE BIT12
602 #define SICR_TXC (BIT13+BIT12)
603 #define SICR_RI_ACTIVE BIT11
604 #define SICR_RI_INACTIVE BIT10
605 #define SICR_RI (BIT11+BIT10)
606 #define SICR_DSR_ACTIVE BIT9
607 #define SICR_DSR_INACTIVE BIT8
608 #define SICR_DSR (BIT9+BIT8)
609 #define SICR_DCD_ACTIVE BIT7
610 #define SICR_DCD_INACTIVE BIT6
611 #define SICR_DCD (BIT7+BIT6)
612 #define SICR_CTS_ACTIVE BIT5
613 #define SICR_CTS_INACTIVE BIT4
614 #define SICR_CTS (BIT5+BIT4)
615 #define SICR_RCC_UNDERFLOW BIT3
616 #define SICR_DPLL_NO_SYNC BIT2
617 #define SICR_BRG1_ZERO BIT1
618 #define SICR_BRG0_ZERO BIT0
620 void usc_DisableMasterIrqBit( struct mgsl_struct *info );
621 void usc_EnableMasterIrqBit( struct mgsl_struct *info );
622 void usc_EnableInterrupts( struct mgsl_struct *info, u16 IrqMask );
623 void usc_DisableInterrupts( struct mgsl_struct *info, u16 IrqMask );
624 void usc_ClearIrqPendingBits( struct mgsl_struct *info, u16 IrqMask );
626 #define usc_EnableInterrupts( a, b ) \
627 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0xc0 + (b)) )
629 #define usc_DisableInterrupts( a, b ) \
630 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0x80 + (b)) )
632 #define usc_EnableMasterIrqBit(a) \
633 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0x0f00) + 0xb000) )
635 #define usc_DisableMasterIrqBit(a) \
636 usc_OutReg( (a), ICR, (u16)(usc_InReg((a),ICR) & 0x7f00) )
638 #define usc_ClearIrqPendingBits( a, b ) usc_OutReg( (a), DCCR, 0x40 + (b) )
641 * Transmit status Bits in Transmit Control status Register (TCSR)
642 * and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0)
645 #define TXSTATUS_PREAMBLE_SENT BIT7
646 #define TXSTATUS_IDLE_SENT BIT6
647 #define TXSTATUS_ABORT_SENT BIT5
648 #define TXSTATUS_EOF BIT4
649 #define TXSTATUS_CRC_SENT BIT3
650 #define TXSTATUS_ALL_SENT BIT2
651 #define TXSTATUS_UNDERRUN BIT1
652 #define TXSTATUS_FIFO_EMPTY BIT0
654 #define DICR_MASTER BIT15
655 #define DICR_TRANSMIT BIT0
656 #define DICR_RECEIVE BIT1
658 #define usc_EnableDmaInterrupts(a,b) \
659 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) | (b)) )
661 #define usc_DisableDmaInterrupts(a,b) \
662 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) & ~(b)) )
664 #define usc_EnableStatusIrqs(a,b) \
665 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) | (b)) )
667 #define usc_DisablestatusIrqs(a,b) \
668 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) & ~(b)) )
670 /* Transmit status Bits in Transmit Control status Register (TCSR) */
671 /* and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0) */
674 #define DISABLE_UNCONDITIONAL 0
675 #define DISABLE_END_OF_FRAME 1
676 #define ENABLE_UNCONDITIONAL 2
677 #define ENABLE_AUTO_CTS 3
678 #define ENABLE_AUTO_DCD 3
679 #define usc_EnableTransmitter(a,b) \
680 usc_OutReg( (a), TMR, (u16)((usc_InReg((a),TMR) & 0xfffc) | (b)) )
681 #define usc_EnableReceiver(a,b) \
682 usc_OutReg( (a), RMR, (u16)((usc_InReg((a),RMR) & 0xfffc) | (b)) )
684 static u16 usc_InDmaReg( struct mgsl_struct *info, u16 Port );
685 static void usc_OutDmaReg( struct mgsl_struct *info, u16 Port, u16 Value );
686 static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd );
688 static u16 usc_InReg( struct mgsl_struct *info, u16 Port );
689 static void usc_OutReg( struct mgsl_struct *info, u16 Port, u16 Value );
690 static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd );
691 void usc_RCmd( struct mgsl_struct *info, u16 Cmd );
692 void usc_TCmd( struct mgsl_struct *info, u16 Cmd );
694 #define usc_TCmd(a,b) usc_OutReg((a), TCSR, (u16)((a)->tcsr_value + (b)))
695 #define usc_RCmd(a,b) usc_OutReg((a), RCSR, (b))
697 #define usc_SetTransmitSyncChars(a,s0,s1) usc_OutReg((a), TSR, (u16)(((u16)s0<<8)|(u16)s1))
699 static void usc_process_rxoverrun_sync( struct mgsl_struct *info );
700 static void usc_start_receiver( struct mgsl_struct *info );
701 static void usc_stop_receiver( struct mgsl_struct *info );
703 static void usc_start_transmitter( struct mgsl_struct *info );
704 static void usc_stop_transmitter( struct mgsl_struct *info );
705 static void usc_set_txidle( struct mgsl_struct *info );
706 static void usc_load_txfifo( struct mgsl_struct *info );
708 static void usc_enable_aux_clock( struct mgsl_struct *info, u32 DataRate );
709 static void usc_enable_loopback( struct mgsl_struct *info, int enable );
711 static void usc_get_serial_signals( struct mgsl_struct *info );
712 static void usc_set_serial_signals( struct mgsl_struct *info );
714 static void usc_reset( struct mgsl_struct *info );
716 static void usc_set_sync_mode( struct mgsl_struct *info );
717 static void usc_set_sdlc_mode( struct mgsl_struct *info );
718 static void usc_set_async_mode( struct mgsl_struct *info );
719 static void usc_enable_async_clock( struct mgsl_struct *info, u32 DataRate );
721 static void usc_loopback_frame( struct mgsl_struct *info );
723 static void mgsl_tx_timeout(unsigned long context);
726 static void usc_loopmode_cancel_transmit( struct mgsl_struct * info );
727 static void usc_loopmode_insert_request( struct mgsl_struct * info );
728 static int usc_loopmode_active( struct mgsl_struct * info);
729 static void usc_loopmode_send_done( struct mgsl_struct * info );
731 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg);
734 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
735 static void hdlcdev_tx_done(struct mgsl_struct *info);
736 static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size);
737 static int hdlcdev_init(struct mgsl_struct *info);
738 static void hdlcdev_exit(struct mgsl_struct *info);
742 * Defines a BUS descriptor value for the PCI adapter
743 * local bus address ranges.
746 #define BUS_DESCRIPTOR( WrHold, WrDly, RdDly, Nwdd, Nwad, Nxda, Nrdd, Nrad ) \
757 static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit);
760 * Adapter diagnostic routines
762 static BOOLEAN mgsl_register_test( struct mgsl_struct *info );
763 static BOOLEAN mgsl_irq_test( struct mgsl_struct *info );
764 static BOOLEAN mgsl_dma_test( struct mgsl_struct *info );
765 static BOOLEAN mgsl_memory_test( struct mgsl_struct *info );
766 static int mgsl_adapter_test( struct mgsl_struct *info );
769 * device and resource management routines
771 static int mgsl_claim_resources(struct mgsl_struct *info);
772 static void mgsl_release_resources(struct mgsl_struct *info);
773 static void mgsl_add_device(struct mgsl_struct *info);
774 static struct mgsl_struct* mgsl_allocate_device(void);
777 * DMA buffer manupulation functions.
779 static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex );
780 static int mgsl_get_rx_frame( struct mgsl_struct *info );
781 static int mgsl_get_raw_rx_frame( struct mgsl_struct *info );
782 static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info );
783 static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info );
784 static int num_free_tx_dma_buffers(struct mgsl_struct *info);
785 static void mgsl_load_tx_dma_buffer( struct mgsl_struct *info, const char *Buffer, unsigned int BufferSize);
786 static void mgsl_load_pci_memory(char* TargetPtr, const char* SourcePtr, unsigned short count);
789 * DMA and Shared Memory buffer allocation and formatting
791 static int mgsl_allocate_dma_buffers(struct mgsl_struct *info);
792 static void mgsl_free_dma_buffers(struct mgsl_struct *info);
793 static int mgsl_alloc_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
794 static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
795 static int mgsl_alloc_buffer_list_memory(struct mgsl_struct *info);
796 static void mgsl_free_buffer_list_memory(struct mgsl_struct *info);
797 static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info);
798 static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info);
799 static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info);
800 static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info);
801 static int load_next_tx_holding_buffer(struct mgsl_struct *info);
802 static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize);
805 * Bottom half interrupt handlers
807 static void mgsl_bh_handler(void* Context);
808 static void mgsl_bh_receive(struct mgsl_struct *info);
809 static void mgsl_bh_transmit(struct mgsl_struct *info);
810 static void mgsl_bh_status(struct mgsl_struct *info);
813 * Interrupt handler routines and dispatch table.
815 static void mgsl_isr_null( struct mgsl_struct *info );
816 static void mgsl_isr_transmit_data( struct mgsl_struct *info );
817 static void mgsl_isr_receive_data( struct mgsl_struct *info );
818 static void mgsl_isr_receive_status( struct mgsl_struct *info );
819 static void mgsl_isr_transmit_status( struct mgsl_struct *info );
820 static void mgsl_isr_io_pin( struct mgsl_struct *info );
821 static void mgsl_isr_misc( struct mgsl_struct *info );
822 static void mgsl_isr_receive_dma( struct mgsl_struct *info );
823 static void mgsl_isr_transmit_dma( struct mgsl_struct *info );
825 typedef void (*isr_dispatch_func)(struct mgsl_struct *);
827 static isr_dispatch_func UscIsrTable[7] =
832 mgsl_isr_transmit_data,
833 mgsl_isr_transmit_status,
834 mgsl_isr_receive_data,
835 mgsl_isr_receive_status
839 * ioctl call handlers
841 static int tiocmget(struct tty_struct *tty, struct file *file);
842 static int tiocmset(struct tty_struct *tty, struct file *file,
843 unsigned int set, unsigned int clear);
844 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount
845 __user *user_icount);
846 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params);
847 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params);
848 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode);
849 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode);
850 static int mgsl_txenable(struct mgsl_struct * info, int enable);
851 static int mgsl_txabort(struct mgsl_struct * info);
852 static int mgsl_rxenable(struct mgsl_struct * info, int enable);
853 static int mgsl_wait_event(struct mgsl_struct * info, int __user *mask);
854 static int mgsl_loopmode_send_done( struct mgsl_struct * info );
856 /* set non-zero on successful registration with PCI subsystem */
857 static int pci_registered;
860 * Global linked list of SyncLink devices
862 static struct mgsl_struct *mgsl_device_list;
863 static int mgsl_device_count;
866 * Set this param to non-zero to load eax with the
867 * .text section address and breakpoint on module load.
868 * This is useful for use with gdb and add-symbol-file command.
870 static int break_on_load;
873 * Driver major number, defaults to zero to get auto
874 * assigned major number. May be forced as module parameter.
879 * Array of user specified options for ISA adapters.
881 static int io[MAX_ISA_DEVICES];
882 static int irq[MAX_ISA_DEVICES];
883 static int dma[MAX_ISA_DEVICES];
884 static int debug_level;
885 static int maxframe[MAX_TOTAL_DEVICES];
886 static int dosyncppp[MAX_TOTAL_DEVICES];
887 static int txdmabufs[MAX_TOTAL_DEVICES];
888 static int txholdbufs[MAX_TOTAL_DEVICES];
890 module_param(break_on_load, bool, 0);
891 module_param(ttymajor, int, 0);
892 module_param_array(io, int, NULL, 0);
893 module_param_array(irq, int, NULL, 0);
894 module_param_array(dma, int, NULL, 0);
895 module_param(debug_level, int, 0);
896 module_param_array(maxframe, int, NULL, 0);
897 module_param_array(dosyncppp, int, NULL, 0);
898 module_param_array(txdmabufs, int, NULL, 0);
899 module_param_array(txholdbufs, int, NULL, 0);
901 static char *driver_name = "SyncLink serial driver";
902 static char *driver_version = "$Revision: 4.38 $";
904 static int synclink_init_one (struct pci_dev *dev,
905 const struct pci_device_id *ent);
906 static void synclink_remove_one (struct pci_dev *dev);
908 static struct pci_device_id synclink_pci_tbl[] = {
909 { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_USC, PCI_ANY_ID, PCI_ANY_ID, },
910 { PCI_VENDOR_ID_MICROGATE, 0x0210, PCI_ANY_ID, PCI_ANY_ID, },
911 { 0, }, /* terminate list */
913 MODULE_DEVICE_TABLE(pci, synclink_pci_tbl);
915 MODULE_LICENSE("GPL");
917 static struct pci_driver synclink_pci_driver = {
919 .id_table = synclink_pci_tbl,
920 .probe = synclink_init_one,
921 .remove = __devexit_p(synclink_remove_one),
924 static struct tty_driver *serial_driver;
926 /* number of characters left in xmit buffer before we ask for more */
927 #define WAKEUP_CHARS 256
930 static void mgsl_change_params(struct mgsl_struct *info);
931 static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout);
934 * 1st function defined in .text section. Calling this function in
935 * init_module() followed by a breakpoint allows a remote debugger
936 * (gdb) to get the .text address for the add-symbol-file command.
937 * This allows remote debugging of dynamically loadable modules.
939 static void* mgsl_get_text_ptr(void)
941 return mgsl_get_text_ptr;
945 * tmp_buf is used as a temporary buffer by mgsl_write. We need to
946 * lock it in case the COPY_FROM_USER blocks while swapping in a page,
947 * and some other program tries to do a serial write at the same time.
948 * Since the lock will only come under contention when the system is
949 * swapping and available memory is low, it makes sense to share one
950 * buffer across all the serial ioports, since it significantly saves
951 * memory if large numbers of serial ports are open.
953 static unsigned char *tmp_buf;
954 static DECLARE_MUTEX(tmp_buf_sem);
956 static inline int mgsl_paranoia_check(struct mgsl_struct *info,
957 char *name, const char *routine)
959 #ifdef MGSL_PARANOIA_CHECK
960 static const char *badmagic =
961 "Warning: bad magic number for mgsl struct (%s) in %s\n";
962 static const char *badinfo =
963 "Warning: null mgsl_struct for (%s) in %s\n";
966 printk(badinfo, name, routine);
969 if (info->magic != MGSL_MAGIC) {
970 printk(badmagic, name, routine);
981 * line discipline callback wrappers
983 * The wrappers maintain line discipline references
984 * while calling into the line discipline.
986 * ldisc_receive_buf - pass receive data to line discipline
989 static void ldisc_receive_buf(struct tty_struct *tty,
990 const __u8 *data, char *flags, int count)
992 struct tty_ldisc *ld;
995 ld = tty_ldisc_ref(tty);
998 ld->receive_buf(tty, data, flags, count);
1003 /* mgsl_stop() throttle (stop) transmitter
1005 * Arguments: tty pointer to tty info structure
1006 * Return Value: None
1008 static void mgsl_stop(struct tty_struct *tty)
1010 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
1011 unsigned long flags;
1013 if (mgsl_paranoia_check(info, tty->name, "mgsl_stop"))
1016 if ( debug_level >= DEBUG_LEVEL_INFO )
1017 printk("mgsl_stop(%s)\n",info->device_name);
1019 spin_lock_irqsave(&info->irq_spinlock,flags);
1020 if (info->tx_enabled)
1021 usc_stop_transmitter(info);
1022 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1024 } /* end of mgsl_stop() */
1026 /* mgsl_start() release (start) transmitter
1028 * Arguments: tty pointer to tty info structure
1029 * Return Value: None
1031 static void mgsl_start(struct tty_struct *tty)
1033 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
1034 unsigned long flags;
1036 if (mgsl_paranoia_check(info, tty->name, "mgsl_start"))
1039 if ( debug_level >= DEBUG_LEVEL_INFO )
1040 printk("mgsl_start(%s)\n",info->device_name);
1042 spin_lock_irqsave(&info->irq_spinlock,flags);
1043 if (!info->tx_enabled)
1044 usc_start_transmitter(info);
1045 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1047 } /* end of mgsl_start() */
1050 * Bottom half work queue access functions
1053 /* mgsl_bh_action() Return next bottom half action to perform.
1054 * Return Value: BH action code or 0 if nothing to do.
1056 static int mgsl_bh_action(struct mgsl_struct *info)
1058 unsigned long flags;
1061 spin_lock_irqsave(&info->irq_spinlock,flags);
1063 if (info->pending_bh & BH_RECEIVE) {
1064 info->pending_bh &= ~BH_RECEIVE;
1066 } else if (info->pending_bh & BH_TRANSMIT) {
1067 info->pending_bh &= ~BH_TRANSMIT;
1069 } else if (info->pending_bh & BH_STATUS) {
1070 info->pending_bh &= ~BH_STATUS;
1075 /* Mark BH routine as complete */
1076 info->bh_running = 0;
1077 info->bh_requested = 0;
1080 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1086 * Perform bottom half processing of work items queued by ISR.
1088 static void mgsl_bh_handler(void* Context)
1090 struct mgsl_struct *info = (struct mgsl_struct*)Context;
1096 if ( debug_level >= DEBUG_LEVEL_BH )
1097 printk( "%s(%d):mgsl_bh_handler(%s) entry\n",
1098 __FILE__,__LINE__,info->device_name);
1100 info->bh_running = 1;
1102 while((action = mgsl_bh_action(info)) != 0) {
1104 /* Process work item */
1105 if ( debug_level >= DEBUG_LEVEL_BH )
1106 printk( "%s(%d):mgsl_bh_handler() work item action=%d\n",
1107 __FILE__,__LINE__,action);
1112 mgsl_bh_receive(info);
1115 mgsl_bh_transmit(info);
1118 mgsl_bh_status(info);
1121 /* unknown work item ID */
1122 printk("Unknown work item ID=%08X!\n", action);
1127 if ( debug_level >= DEBUG_LEVEL_BH )
1128 printk( "%s(%d):mgsl_bh_handler(%s) exit\n",
1129 __FILE__,__LINE__,info->device_name);
1132 static void mgsl_bh_receive(struct mgsl_struct *info)
1134 int (*get_rx_frame)(struct mgsl_struct *info) =
1135 (info->params.mode == MGSL_MODE_HDLC ? mgsl_get_rx_frame : mgsl_get_raw_rx_frame);
1137 if ( debug_level >= DEBUG_LEVEL_BH )
1138 printk( "%s(%d):mgsl_bh_receive(%s)\n",
1139 __FILE__,__LINE__,info->device_name);
1143 if (info->rx_rcc_underrun) {
1144 unsigned long flags;
1145 spin_lock_irqsave(&info->irq_spinlock,flags);
1146 usc_start_receiver(info);
1147 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1150 } while(get_rx_frame(info));
1153 static void mgsl_bh_transmit(struct mgsl_struct *info)
1155 struct tty_struct *tty = info->tty;
1156 unsigned long flags;
1158 if ( debug_level >= DEBUG_LEVEL_BH )
1159 printk( "%s(%d):mgsl_bh_transmit() entry on %s\n",
1160 __FILE__,__LINE__,info->device_name);
1164 wake_up_interruptible(&tty->write_wait);
1167 /* if transmitter idle and loopmode_send_done_requested
1168 * then start echoing RxD to TxD
1170 spin_lock_irqsave(&info->irq_spinlock,flags);
1171 if ( !info->tx_active && info->loopmode_send_done_requested )
1172 usc_loopmode_send_done( info );
1173 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1176 static void mgsl_bh_status(struct mgsl_struct *info)
1178 if ( debug_level >= DEBUG_LEVEL_BH )
1179 printk( "%s(%d):mgsl_bh_status() entry on %s\n",
1180 __FILE__,__LINE__,info->device_name);
1182 info->ri_chkcount = 0;
1183 info->dsr_chkcount = 0;
1184 info->dcd_chkcount = 0;
1185 info->cts_chkcount = 0;
1188 /* mgsl_isr_receive_status()
1190 * Service a receive status interrupt. The type of status
1191 * interrupt is indicated by the state of the RCSR.
1192 * This is only used for HDLC mode.
1194 * Arguments: info pointer to device instance data
1195 * Return Value: None
1197 static void mgsl_isr_receive_status( struct mgsl_struct *info )
1199 u16 status = usc_InReg( info, RCSR );
1201 if ( debug_level >= DEBUG_LEVEL_ISR )
1202 printk("%s(%d):mgsl_isr_receive_status status=%04X\n",
1203 __FILE__,__LINE__,status);
1205 if ( (status & RXSTATUS_ABORT_RECEIVED) &&
1206 info->loopmode_insert_requested &&
1207 usc_loopmode_active(info) )
1209 ++info->icount.rxabort;
1210 info->loopmode_insert_requested = FALSE;
1212 /* clear CMR:13 to start echoing RxD to TxD */
1213 info->cmr_value &= ~BIT13;
1214 usc_OutReg(info, CMR, info->cmr_value);
1216 /* disable received abort irq (no longer required) */
1217 usc_OutReg(info, RICR,
1218 (usc_InReg(info, RICR) & ~RXSTATUS_ABORT_RECEIVED));
1221 if (status & (RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED)) {
1222 if (status & RXSTATUS_EXITED_HUNT)
1223 info->icount.exithunt++;
1224 if (status & RXSTATUS_IDLE_RECEIVED)
1225 info->icount.rxidle++;
1226 wake_up_interruptible(&info->event_wait_q);
1229 if (status & RXSTATUS_OVERRUN){
1230 info->icount.rxover++;
1231 usc_process_rxoverrun_sync( info );
1234 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
1235 usc_UnlatchRxstatusBits( info, status );
1237 } /* end of mgsl_isr_receive_status() */
1239 /* mgsl_isr_transmit_status()
1241 * Service a transmit status interrupt
1242 * HDLC mode :end of transmit frame
1243 * Async mode:all data is sent
1244 * transmit status is indicated by bits in the TCSR.
1246 * Arguments: info pointer to device instance data
1247 * Return Value: None
1249 static void mgsl_isr_transmit_status( struct mgsl_struct *info )
1251 u16 status = usc_InReg( info, TCSR );
1253 if ( debug_level >= DEBUG_LEVEL_ISR )
1254 printk("%s(%d):mgsl_isr_transmit_status status=%04X\n",
1255 __FILE__,__LINE__,status);
1257 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
1258 usc_UnlatchTxstatusBits( info, status );
1260 if ( status & (TXSTATUS_UNDERRUN | TXSTATUS_ABORT_SENT) )
1262 /* finished sending HDLC abort. This may leave */
1263 /* the TxFifo with data from the aborted frame */
1264 /* so purge the TxFifo. Also shutdown the DMA */
1265 /* channel in case there is data remaining in */
1266 /* the DMA buffer */
1267 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
1268 usc_RTCmd( info, RTCmd_PurgeTxFifo );
1271 if ( status & TXSTATUS_EOF_SENT )
1272 info->icount.txok++;
1273 else if ( status & TXSTATUS_UNDERRUN )
1274 info->icount.txunder++;
1275 else if ( status & TXSTATUS_ABORT_SENT )
1276 info->icount.txabort++;
1278 info->icount.txunder++;
1280 info->tx_active = 0;
1281 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1282 del_timer(&info->tx_timer);
1284 if ( info->drop_rts_on_tx_done ) {
1285 usc_get_serial_signals( info );
1286 if ( info->serial_signals & SerialSignal_RTS ) {
1287 info->serial_signals &= ~SerialSignal_RTS;
1288 usc_set_serial_signals( info );
1290 info->drop_rts_on_tx_done = 0;
1295 hdlcdev_tx_done(info);
1299 if (info->tty->stopped || info->tty->hw_stopped) {
1300 usc_stop_transmitter(info);
1303 info->pending_bh |= BH_TRANSMIT;
1306 } /* end of mgsl_isr_transmit_status() */
1308 /* mgsl_isr_io_pin()
1310 * Service an Input/Output pin interrupt. The type of
1311 * interrupt is indicated by bits in the MISR
1313 * Arguments: info pointer to device instance data
1314 * Return Value: None
1316 static void mgsl_isr_io_pin( struct mgsl_struct *info )
1318 struct mgsl_icount *icount;
1319 u16 status = usc_InReg( info, MISR );
1321 if ( debug_level >= DEBUG_LEVEL_ISR )
1322 printk("%s(%d):mgsl_isr_io_pin status=%04X\n",
1323 __FILE__,__LINE__,status);
1325 usc_ClearIrqPendingBits( info, IO_PIN );
1326 usc_UnlatchIostatusBits( info, status );
1328 if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
1329 MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
1330 icount = &info->icount;
1331 /* update input line counters */
1332 if (status & MISCSTATUS_RI_LATCHED) {
1333 if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1334 usc_DisablestatusIrqs(info,SICR_RI);
1336 if ( status & MISCSTATUS_RI )
1337 info->input_signal_events.ri_up++;
1339 info->input_signal_events.ri_down++;
1341 if (status & MISCSTATUS_DSR_LATCHED) {
1342 if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1343 usc_DisablestatusIrqs(info,SICR_DSR);
1345 if ( status & MISCSTATUS_DSR )
1346 info->input_signal_events.dsr_up++;
1348 info->input_signal_events.dsr_down++;
1350 if (status & MISCSTATUS_DCD_LATCHED) {
1351 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1352 usc_DisablestatusIrqs(info,SICR_DCD);
1354 if (status & MISCSTATUS_DCD) {
1355 info->input_signal_events.dcd_up++;
1357 info->input_signal_events.dcd_down++;
1360 hdlc_set_carrier(status & MISCSTATUS_DCD, info->netdev);
1363 if (status & MISCSTATUS_CTS_LATCHED)
1365 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1366 usc_DisablestatusIrqs(info,SICR_CTS);
1368 if ( status & MISCSTATUS_CTS )
1369 info->input_signal_events.cts_up++;
1371 info->input_signal_events.cts_down++;
1373 wake_up_interruptible(&info->status_event_wait_q);
1374 wake_up_interruptible(&info->event_wait_q);
1376 if ( (info->flags & ASYNC_CHECK_CD) &&
1377 (status & MISCSTATUS_DCD_LATCHED) ) {
1378 if ( debug_level >= DEBUG_LEVEL_ISR )
1379 printk("%s CD now %s...", info->device_name,
1380 (status & MISCSTATUS_DCD) ? "on" : "off");
1381 if (status & MISCSTATUS_DCD)
1382 wake_up_interruptible(&info->open_wait);
1384 if ( debug_level >= DEBUG_LEVEL_ISR )
1385 printk("doing serial hangup...");
1387 tty_hangup(info->tty);
1391 if ( (info->flags & ASYNC_CTS_FLOW) &&
1392 (status & MISCSTATUS_CTS_LATCHED) ) {
1393 if (info->tty->hw_stopped) {
1394 if (status & MISCSTATUS_CTS) {
1395 if ( debug_level >= DEBUG_LEVEL_ISR )
1396 printk("CTS tx start...");
1398 info->tty->hw_stopped = 0;
1399 usc_start_transmitter(info);
1400 info->pending_bh |= BH_TRANSMIT;
1404 if (!(status & MISCSTATUS_CTS)) {
1405 if ( debug_level >= DEBUG_LEVEL_ISR )
1406 printk("CTS tx stop...");
1408 info->tty->hw_stopped = 1;
1409 usc_stop_transmitter(info);
1415 info->pending_bh |= BH_STATUS;
1417 /* for diagnostics set IRQ flag */
1418 if ( status & MISCSTATUS_TXC_LATCHED ){
1419 usc_OutReg( info, SICR,
1420 (unsigned short)(usc_InReg(info,SICR) & ~(SICR_TXC_ACTIVE+SICR_TXC_INACTIVE)) );
1421 usc_UnlatchIostatusBits( info, MISCSTATUS_TXC_LATCHED );
1422 info->irq_occurred = 1;
1425 } /* end of mgsl_isr_io_pin() */
1427 /* mgsl_isr_transmit_data()
1429 * Service a transmit data interrupt (async mode only).
1431 * Arguments: info pointer to device instance data
1432 * Return Value: None
1434 static void mgsl_isr_transmit_data( struct mgsl_struct *info )
1436 if ( debug_level >= DEBUG_LEVEL_ISR )
1437 printk("%s(%d):mgsl_isr_transmit_data xmit_cnt=%d\n",
1438 __FILE__,__LINE__,info->xmit_cnt);
1440 usc_ClearIrqPendingBits( info, TRANSMIT_DATA );
1442 if (info->tty->stopped || info->tty->hw_stopped) {
1443 usc_stop_transmitter(info);
1447 if ( info->xmit_cnt )
1448 usc_load_txfifo( info );
1450 info->tx_active = 0;
1452 if (info->xmit_cnt < WAKEUP_CHARS)
1453 info->pending_bh |= BH_TRANSMIT;
1455 } /* end of mgsl_isr_transmit_data() */
1457 /* mgsl_isr_receive_data()
1459 * Service a receive data interrupt. This occurs
1460 * when operating in asynchronous interrupt transfer mode.
1461 * The receive data FIFO is flushed to the receive data buffers.
1463 * Arguments: info pointer to device instance data
1464 * Return Value: None
1466 static void mgsl_isr_receive_data( struct mgsl_struct *info )
1471 unsigned char DataByte;
1472 struct tty_struct *tty = info->tty;
1473 struct mgsl_icount *icount = &info->icount;
1475 if ( debug_level >= DEBUG_LEVEL_ISR )
1476 printk("%s(%d):mgsl_isr_receive_data\n",
1479 usc_ClearIrqPendingBits( info, RECEIVE_DATA );
1481 /* select FIFO status for RICR readback */
1482 usc_RCmd( info, RCmd_SelectRicrRxFifostatus );
1484 /* clear the Wordstatus bit so that status readback */
1485 /* only reflects the status of this byte */
1486 usc_OutReg( info, RICR+LSBONLY, (u16)(usc_InReg(info, RICR+LSBONLY) & ~BIT3 ));
1488 /* flush the receive FIFO */
1490 while( (Fifocount = (usc_InReg(info,RICR) >> 8)) ) {
1493 /* read one byte from RxFIFO */
1494 outw( (inw(info->io_base + CCAR) & 0x0780) | (RDR+LSBONLY),
1495 info->io_base + CCAR );
1496 DataByte = inb( info->io_base + CCAR );
1498 /* get the status of the received byte */
1499 status = usc_InReg(info, RCSR);
1500 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1501 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) )
1502 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
1507 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1508 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) ) {
1509 printk("rxerr=%04X\n",status);
1510 /* update error statistics */
1511 if ( status & RXSTATUS_BREAK_RECEIVED ) {
1512 status &= ~(RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR);
1514 } else if (status & RXSTATUS_PARITY_ERROR)
1516 else if (status & RXSTATUS_FRAMING_ERROR)
1518 else if (status & RXSTATUS_OVERRUN) {
1519 /* must issue purge fifo cmd before */
1520 /* 16C32 accepts more receive chars */
1521 usc_RTCmd(info,RTCmd_PurgeRxFifo);
1525 /* discard char if tty control flags say so */
1526 if (status & info->ignore_status_mask)
1529 status &= info->read_status_mask;
1531 if (status & RXSTATUS_BREAK_RECEIVED) {
1533 if (info->flags & ASYNC_SAK)
1535 } else if (status & RXSTATUS_PARITY_ERROR)
1537 else if (status & RXSTATUS_FRAMING_ERROR)
1539 } /* end of if (error) */
1540 tty_insert_flip_char(tty, DataByte, flag);
1541 if (status & RXSTATUS_OVERRUN) {
1542 /* Overrun is special, since it's
1543 * reported immediately, and doesn't
1544 * affect the current character
1546 work += tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1550 if ( debug_level >= DEBUG_LEVEL_ISR ) {
1551 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
1552 __FILE__,__LINE__,icount->rx,icount->brk,
1553 icount->parity,icount->frame,icount->overrun);
1557 tty_flip_buffer_push(tty);
1562 * Service a miscellaneos interrupt source.
1564 * Arguments: info pointer to device extension (instance data)
1565 * Return Value: None
1567 static void mgsl_isr_misc( struct mgsl_struct *info )
1569 u16 status = usc_InReg( info, MISR );
1571 if ( debug_level >= DEBUG_LEVEL_ISR )
1572 printk("%s(%d):mgsl_isr_misc status=%04X\n",
1573 __FILE__,__LINE__,status);
1575 if ((status & MISCSTATUS_RCC_UNDERRUN) &&
1576 (info->params.mode == MGSL_MODE_HDLC)) {
1578 /* turn off receiver and rx DMA */
1579 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
1580 usc_DmaCmd(info, DmaCmd_ResetRxChannel);
1581 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
1582 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
1583 usc_DisableInterrupts(info, RECEIVE_DATA + RECEIVE_STATUS);
1585 /* schedule BH handler to restart receiver */
1586 info->pending_bh |= BH_RECEIVE;
1587 info->rx_rcc_underrun = 1;
1590 usc_ClearIrqPendingBits( info, MISC );
1591 usc_UnlatchMiscstatusBits( info, status );
1593 } /* end of mgsl_isr_misc() */
1597 * Services undefined interrupt vectors from the
1598 * USC. (hence this function SHOULD never be called)
1600 * Arguments: info pointer to device extension (instance data)
1601 * Return Value: None
1603 static void mgsl_isr_null( struct mgsl_struct *info )
1606 } /* end of mgsl_isr_null() */
1608 /* mgsl_isr_receive_dma()
1610 * Service a receive DMA channel interrupt.
1611 * For this driver there are two sources of receive DMA interrupts
1612 * as identified in the Receive DMA mode Register (RDMR):
1614 * BIT3 EOA/EOL End of List, all receive buffers in receive
1615 * buffer list have been filled (no more free buffers
1616 * available). The DMA controller has shut down.
1618 * BIT2 EOB End of Buffer. This interrupt occurs when a receive
1619 * DMA buffer is terminated in response to completion
1620 * of a good frame or a frame with errors. The status
1621 * of the frame is stored in the buffer entry in the
1622 * list of receive buffer entries.
1624 * Arguments: info pointer to device instance data
1625 * Return Value: None
1627 static void mgsl_isr_receive_dma( struct mgsl_struct *info )
1631 /* clear interrupt pending and IUS bit for Rx DMA IRQ */
1632 usc_OutDmaReg( info, CDIR, BIT9+BIT1 );
1634 /* Read the receive DMA status to identify interrupt type. */
1635 /* This also clears the status bits. */
1636 status = usc_InDmaReg( info, RDMR );
1638 if ( debug_level >= DEBUG_LEVEL_ISR )
1639 printk("%s(%d):mgsl_isr_receive_dma(%s) status=%04X\n",
1640 __FILE__,__LINE__,info->device_name,status);
1642 info->pending_bh |= BH_RECEIVE;
1644 if ( status & BIT3 ) {
1645 info->rx_overflow = 1;
1646 info->icount.buf_overrun++;
1649 } /* end of mgsl_isr_receive_dma() */
1651 /* mgsl_isr_transmit_dma()
1653 * This function services a transmit DMA channel interrupt.
1655 * For this driver there is one source of transmit DMA interrupts
1656 * as identified in the Transmit DMA Mode Register (TDMR):
1658 * BIT2 EOB End of Buffer. This interrupt occurs when a
1659 * transmit DMA buffer has been emptied.
1661 * The driver maintains enough transmit DMA buffers to hold at least
1662 * one max frame size transmit frame. When operating in a buffered
1663 * transmit mode, there may be enough transmit DMA buffers to hold at
1664 * least two or more max frame size frames. On an EOB condition,
1665 * determine if there are any queued transmit buffers and copy into
1666 * transmit DMA buffers if we have room.
1668 * Arguments: info pointer to device instance data
1669 * Return Value: None
1671 static void mgsl_isr_transmit_dma( struct mgsl_struct *info )
1675 /* clear interrupt pending and IUS bit for Tx DMA IRQ */
1676 usc_OutDmaReg(info, CDIR, BIT8+BIT0 );
1678 /* Read the transmit DMA status to identify interrupt type. */
1679 /* This also clears the status bits. */
1681 status = usc_InDmaReg( info, TDMR );
1683 if ( debug_level >= DEBUG_LEVEL_ISR )
1684 printk("%s(%d):mgsl_isr_transmit_dma(%s) status=%04X\n",
1685 __FILE__,__LINE__,info->device_name,status);
1687 if ( status & BIT2 ) {
1688 --info->tx_dma_buffers_used;
1690 /* if there are transmit frames queued,
1691 * try to load the next one
1693 if ( load_next_tx_holding_buffer(info) ) {
1694 /* if call returns non-zero value, we have
1695 * at least one free tx holding buffer
1697 info->pending_bh |= BH_TRANSMIT;
1701 } /* end of mgsl_isr_transmit_dma() */
1705 * Interrupt service routine entry point.
1709 * irq interrupt number that caused interrupt
1710 * dev_id device ID supplied during interrupt registration
1711 * regs interrupted processor context
1713 * Return Value: None
1715 static irqreturn_t mgsl_interrupt(int irq, void *dev_id, struct pt_regs * regs)
1717 struct mgsl_struct * info;
1721 if ( debug_level >= DEBUG_LEVEL_ISR )
1722 printk("%s(%d):mgsl_interrupt(%d)entry.\n",
1723 __FILE__,__LINE__,irq);
1725 info = (struct mgsl_struct *)dev_id;
1729 spin_lock(&info->irq_spinlock);
1732 /* Read the interrupt vectors from hardware. */
1733 UscVector = usc_InReg(info, IVR) >> 9;
1734 DmaVector = usc_InDmaReg(info, DIVR);
1736 if ( debug_level >= DEBUG_LEVEL_ISR )
1737 printk("%s(%d):%s UscVector=%08X DmaVector=%08X\n",
1738 __FILE__,__LINE__,info->device_name,UscVector,DmaVector);
1740 if ( !UscVector && !DmaVector )
1743 /* Dispatch interrupt vector */
1745 (*UscIsrTable[UscVector])(info);
1746 else if ( (DmaVector&(BIT10|BIT9)) == BIT10)
1747 mgsl_isr_transmit_dma(info);
1749 mgsl_isr_receive_dma(info);
1751 if ( info->isr_overflow ) {
1752 printk(KERN_ERR"%s(%d):%s isr overflow irq=%d\n",
1753 __FILE__,__LINE__,info->device_name, irq);
1754 usc_DisableMasterIrqBit(info);
1755 usc_DisableDmaInterrupts(info,DICR_MASTER);
1760 /* Request bottom half processing if there's something
1761 * for it to do and the bh is not already running
1764 if ( info->pending_bh && !info->bh_running && !info->bh_requested ) {
1765 if ( debug_level >= DEBUG_LEVEL_ISR )
1766 printk("%s(%d):%s queueing bh task.\n",
1767 __FILE__,__LINE__,info->device_name);
1768 schedule_work(&info->task);
1769 info->bh_requested = 1;
1772 spin_unlock(&info->irq_spinlock);
1774 if ( debug_level >= DEBUG_LEVEL_ISR )
1775 printk("%s(%d):mgsl_interrupt(%d)exit.\n",
1776 __FILE__,__LINE__,irq);
1778 } /* end of mgsl_interrupt() */
1782 * Initialize and start device.
1784 * Arguments: info pointer to device instance data
1785 * Return Value: 0 if success, otherwise error code
1787 static int startup(struct mgsl_struct * info)
1791 if ( debug_level >= DEBUG_LEVEL_INFO )
1792 printk("%s(%d):mgsl_startup(%s)\n",__FILE__,__LINE__,info->device_name);
1794 if (info->flags & ASYNC_INITIALIZED)
1797 if (!info->xmit_buf) {
1798 /* allocate a page of memory for a transmit buffer */
1799 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1800 if (!info->xmit_buf) {
1801 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1802 __FILE__,__LINE__,info->device_name);
1807 info->pending_bh = 0;
1809 memset(&info->icount, 0, sizeof(info->icount));
1811 init_timer(&info->tx_timer);
1812 info->tx_timer.data = (unsigned long)info;
1813 info->tx_timer.function = mgsl_tx_timeout;
1815 /* Allocate and claim adapter resources */
1816 retval = mgsl_claim_resources(info);
1818 /* perform existence check and diagnostics */
1820 retval = mgsl_adapter_test(info);
1823 if (capable(CAP_SYS_ADMIN) && info->tty)
1824 set_bit(TTY_IO_ERROR, &info->tty->flags);
1825 mgsl_release_resources(info);
1829 /* program hardware for current parameters */
1830 mgsl_change_params(info);
1833 clear_bit(TTY_IO_ERROR, &info->tty->flags);
1835 info->flags |= ASYNC_INITIALIZED;
1839 } /* end of startup() */
1843 * Called by mgsl_close() and mgsl_hangup() to shutdown hardware
1845 * Arguments: info pointer to device instance data
1846 * Return Value: None
1848 static void shutdown(struct mgsl_struct * info)
1850 unsigned long flags;
1852 if (!(info->flags & ASYNC_INITIALIZED))
1855 if (debug_level >= DEBUG_LEVEL_INFO)
1856 printk("%s(%d):mgsl_shutdown(%s)\n",
1857 __FILE__,__LINE__, info->device_name );
1859 /* clear status wait queue because status changes */
1860 /* can't happen after shutting down the hardware */
1861 wake_up_interruptible(&info->status_event_wait_q);
1862 wake_up_interruptible(&info->event_wait_q);
1864 del_timer(&info->tx_timer);
1866 if (info->xmit_buf) {
1867 free_page((unsigned long) info->xmit_buf);
1868 info->xmit_buf = NULL;
1871 spin_lock_irqsave(&info->irq_spinlock,flags);
1872 usc_DisableMasterIrqBit(info);
1873 usc_stop_receiver(info);
1874 usc_stop_transmitter(info);
1875 usc_DisableInterrupts(info,RECEIVE_DATA + RECEIVE_STATUS +
1876 TRANSMIT_DATA + TRANSMIT_STATUS + IO_PIN + MISC );
1877 usc_DisableDmaInterrupts(info,DICR_MASTER + DICR_TRANSMIT + DICR_RECEIVE);
1879 /* Disable DMAEN (Port 7, Bit 14) */
1880 /* This disconnects the DMA request signal from the ISA bus */
1881 /* on the ISA adapter. This has no effect for the PCI adapter */
1882 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) | BIT14));
1884 /* Disable INTEN (Port 6, Bit12) */
1885 /* This disconnects the IRQ request signal to the ISA bus */
1886 /* on the ISA adapter. This has no effect for the PCI adapter */
1887 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) | BIT12));
1889 if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
1890 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1891 usc_set_serial_signals(info);
1894 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1896 mgsl_release_resources(info);
1899 set_bit(TTY_IO_ERROR, &info->tty->flags);
1901 info->flags &= ~ASYNC_INITIALIZED;
1903 } /* end of shutdown() */
1905 static void mgsl_program_hw(struct mgsl_struct *info)
1907 unsigned long flags;
1909 spin_lock_irqsave(&info->irq_spinlock,flags);
1911 usc_stop_receiver(info);
1912 usc_stop_transmitter(info);
1913 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1915 if (info->params.mode == MGSL_MODE_HDLC ||
1916 info->params.mode == MGSL_MODE_RAW ||
1918 usc_set_sync_mode(info);
1920 usc_set_async_mode(info);
1922 usc_set_serial_signals(info);
1924 info->dcd_chkcount = 0;
1925 info->cts_chkcount = 0;
1926 info->ri_chkcount = 0;
1927 info->dsr_chkcount = 0;
1929 usc_EnableStatusIrqs(info,SICR_CTS+SICR_DSR+SICR_DCD+SICR_RI);
1930 usc_EnableInterrupts(info, IO_PIN);
1931 usc_get_serial_signals(info);
1933 if (info->netcount || info->tty->termios->c_cflag & CREAD)
1934 usc_start_receiver(info);
1936 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1939 /* Reconfigure adapter based on new parameters
1941 static void mgsl_change_params(struct mgsl_struct *info)
1946 if (!info->tty || !info->tty->termios)
1949 if (debug_level >= DEBUG_LEVEL_INFO)
1950 printk("%s(%d):mgsl_change_params(%s)\n",
1951 __FILE__,__LINE__, info->device_name );
1953 cflag = info->tty->termios->c_cflag;
1955 /* if B0 rate (hangup) specified then negate DTR and RTS */
1956 /* otherwise assert DTR and RTS */
1958 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1960 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1962 /* byte size and parity */
1964 switch (cflag & CSIZE) {
1965 case CS5: info->params.data_bits = 5; break;
1966 case CS6: info->params.data_bits = 6; break;
1967 case CS7: info->params.data_bits = 7; break;
1968 case CS8: info->params.data_bits = 8; break;
1969 /* Never happens, but GCC is too dumb to figure it out */
1970 default: info->params.data_bits = 7; break;
1974 info->params.stop_bits = 2;
1976 info->params.stop_bits = 1;
1978 info->params.parity = ASYNC_PARITY_NONE;
1979 if (cflag & PARENB) {
1981 info->params.parity = ASYNC_PARITY_ODD;
1983 info->params.parity = ASYNC_PARITY_EVEN;
1986 info->params.parity = ASYNC_PARITY_SPACE;
1990 /* calculate number of jiffies to transmit a full
1991 * FIFO (32 bytes) at specified data rate
1993 bits_per_char = info->params.data_bits +
1994 info->params.stop_bits + 1;
1996 /* if port data rate is set to 460800 or less then
1997 * allow tty settings to override, otherwise keep the
1998 * current data rate.
2000 if (info->params.data_rate <= 460800)
2001 info->params.data_rate = tty_get_baud_rate(info->tty);
2003 if ( info->params.data_rate ) {
2004 info->timeout = (32*HZ*bits_per_char) /
2005 info->params.data_rate;
2007 info->timeout += HZ/50; /* Add .02 seconds of slop */
2009 if (cflag & CRTSCTS)
2010 info->flags |= ASYNC_CTS_FLOW;
2012 info->flags &= ~ASYNC_CTS_FLOW;
2015 info->flags &= ~ASYNC_CHECK_CD;
2017 info->flags |= ASYNC_CHECK_CD;
2019 /* process tty input control flags */
2021 info->read_status_mask = RXSTATUS_OVERRUN;
2022 if (I_INPCK(info->tty))
2023 info->read_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
2024 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2025 info->read_status_mask |= RXSTATUS_BREAK_RECEIVED;
2027 if (I_IGNPAR(info->tty))
2028 info->ignore_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
2029 if (I_IGNBRK(info->tty)) {
2030 info->ignore_status_mask |= RXSTATUS_BREAK_RECEIVED;
2031 /* If ignoring parity and break indicators, ignore
2032 * overruns too. (For real raw support).
2034 if (I_IGNPAR(info->tty))
2035 info->ignore_status_mask |= RXSTATUS_OVERRUN;
2038 mgsl_program_hw(info);
2040 } /* end of mgsl_change_params() */
2044 * Add a character to the transmit buffer.
2046 * Arguments: tty pointer to tty information structure
2047 * ch character to add to transmit buffer
2049 * Return Value: None
2051 static void mgsl_put_char(struct tty_struct *tty, unsigned char ch)
2053 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2054 unsigned long flags;
2056 if ( debug_level >= DEBUG_LEVEL_INFO ) {
2057 printk( "%s(%d):mgsl_put_char(%d) on %s\n",
2058 __FILE__,__LINE__,ch,info->device_name);
2061 if (mgsl_paranoia_check(info, tty->name, "mgsl_put_char"))
2064 if (!tty || !info->xmit_buf)
2067 spin_lock_irqsave(&info->irq_spinlock,flags);
2069 if ( (info->params.mode == MGSL_MODE_ASYNC ) || !info->tx_active ) {
2071 if (info->xmit_cnt < SERIAL_XMIT_SIZE - 1) {
2072 info->xmit_buf[info->xmit_head++] = ch;
2073 info->xmit_head &= SERIAL_XMIT_SIZE-1;
2078 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2080 } /* end of mgsl_put_char() */
2082 /* mgsl_flush_chars()
2084 * Enable transmitter so remaining characters in the
2085 * transmit buffer are sent.
2087 * Arguments: tty pointer to tty information structure
2088 * Return Value: None
2090 static void mgsl_flush_chars(struct tty_struct *tty)
2092 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2093 unsigned long flags;
2095 if ( debug_level >= DEBUG_LEVEL_INFO )
2096 printk( "%s(%d):mgsl_flush_chars() entry on %s xmit_cnt=%d\n",
2097 __FILE__,__LINE__,info->device_name,info->xmit_cnt);
2099 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_chars"))
2102 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
2106 if ( debug_level >= DEBUG_LEVEL_INFO )
2107 printk( "%s(%d):mgsl_flush_chars() entry on %s starting transmitter\n",
2108 __FILE__,__LINE__,info->device_name );
2110 spin_lock_irqsave(&info->irq_spinlock,flags);
2112 if (!info->tx_active) {
2113 if ( (info->params.mode == MGSL_MODE_HDLC ||
2114 info->params.mode == MGSL_MODE_RAW) && info->xmit_cnt ) {
2115 /* operating in synchronous (frame oriented) mode */
2116 /* copy data from circular xmit_buf to */
2117 /* transmit DMA buffer. */
2118 mgsl_load_tx_dma_buffer(info,
2119 info->xmit_buf,info->xmit_cnt);
2121 usc_start_transmitter(info);
2124 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2126 } /* end of mgsl_flush_chars() */
2130 * Send a block of data
2134 * tty pointer to tty information structure
2135 * buf pointer to buffer containing send data
2136 * count size of send data in bytes
2138 * Return Value: number of characters written
2140 static int mgsl_write(struct tty_struct * tty,
2141 const unsigned char *buf, int count)
2144 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2145 unsigned long flags;
2147 if ( debug_level >= DEBUG_LEVEL_INFO )
2148 printk( "%s(%d):mgsl_write(%s) count=%d\n",
2149 __FILE__,__LINE__,info->device_name,count);
2151 if (mgsl_paranoia_check(info, tty->name, "mgsl_write"))
2154 if (!tty || !info->xmit_buf || !tmp_buf)
2157 if ( info->params.mode == MGSL_MODE_HDLC ||
2158 info->params.mode == MGSL_MODE_RAW ) {
2159 /* operating in synchronous (frame oriented) mode */
2160 /* operating in synchronous (frame oriented) mode */
2161 if (info->tx_active) {
2163 if ( info->params.mode == MGSL_MODE_HDLC ) {
2167 /* transmitter is actively sending data -
2168 * if we have multiple transmit dma and
2169 * holding buffers, attempt to queue this
2170 * frame for transmission at a later time.
2172 if (info->tx_holding_count >= info->num_tx_holding_buffers ) {
2173 /* no tx holding buffers available */
2178 /* queue transmit frame request */
2180 save_tx_buffer_request(info,buf,count);
2182 /* if we have sufficient tx dma buffers,
2183 * load the next buffered tx request
2185 spin_lock_irqsave(&info->irq_spinlock,flags);
2186 load_next_tx_holding_buffer(info);
2187 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2191 /* if operating in HDLC LoopMode and the adapter */
2192 /* has yet to be inserted into the loop, we can't */
2195 if ( (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) &&
2196 !usc_loopmode_active(info) )
2202 if ( info->xmit_cnt ) {
2203 /* Send accumulated from send_char() calls */
2204 /* as frame and wait before accepting more data. */
2207 /* copy data from circular xmit_buf to */
2208 /* transmit DMA buffer. */
2209 mgsl_load_tx_dma_buffer(info,
2210 info->xmit_buf,info->xmit_cnt);
2211 if ( debug_level >= DEBUG_LEVEL_INFO )
2212 printk( "%s(%d):mgsl_write(%s) sync xmit_cnt flushing\n",
2213 __FILE__,__LINE__,info->device_name);
2215 if ( debug_level >= DEBUG_LEVEL_INFO )
2216 printk( "%s(%d):mgsl_write(%s) sync transmit accepted\n",
2217 __FILE__,__LINE__,info->device_name);
2219 info->xmit_cnt = count;
2220 mgsl_load_tx_dma_buffer(info,buf,count);
2224 spin_lock_irqsave(&info->irq_spinlock,flags);
2225 c = min_t(int, count,
2226 min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
2227 SERIAL_XMIT_SIZE - info->xmit_head));
2229 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2232 memcpy(info->xmit_buf + info->xmit_head, buf, c);
2233 info->xmit_head = ((info->xmit_head + c) &
2234 (SERIAL_XMIT_SIZE-1));
2235 info->xmit_cnt += c;
2236 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2243 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
2244 spin_lock_irqsave(&info->irq_spinlock,flags);
2245 if (!info->tx_active)
2246 usc_start_transmitter(info);
2247 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2250 if ( debug_level >= DEBUG_LEVEL_INFO )
2251 printk( "%s(%d):mgsl_write(%s) returning=%d\n",
2252 __FILE__,__LINE__,info->device_name,ret);
2256 } /* end of mgsl_write() */
2258 /* mgsl_write_room()
2260 * Return the count of free bytes in transmit buffer
2262 * Arguments: tty pointer to tty info structure
2263 * Return Value: None
2265 static int mgsl_write_room(struct tty_struct *tty)
2267 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2270 if (mgsl_paranoia_check(info, tty->name, "mgsl_write_room"))
2272 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
2276 if (debug_level >= DEBUG_LEVEL_INFO)
2277 printk("%s(%d):mgsl_write_room(%s)=%d\n",
2278 __FILE__,__LINE__, info->device_name,ret );
2280 if ( info->params.mode == MGSL_MODE_HDLC ||
2281 info->params.mode == MGSL_MODE_RAW ) {
2282 /* operating in synchronous (frame oriented) mode */
2283 if ( info->tx_active )
2286 return HDLC_MAX_FRAME_SIZE;
2291 } /* end of mgsl_write_room() */
2293 /* mgsl_chars_in_buffer()
2295 * Return the count of bytes in transmit buffer
2297 * Arguments: tty pointer to tty info structure
2298 * Return Value: None
2300 static int mgsl_chars_in_buffer(struct tty_struct *tty)
2302 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2304 if (debug_level >= DEBUG_LEVEL_INFO)
2305 printk("%s(%d):mgsl_chars_in_buffer(%s)\n",
2306 __FILE__,__LINE__, info->device_name );
2308 if (mgsl_paranoia_check(info, tty->name, "mgsl_chars_in_buffer"))
2311 if (debug_level >= DEBUG_LEVEL_INFO)
2312 printk("%s(%d):mgsl_chars_in_buffer(%s)=%d\n",
2313 __FILE__,__LINE__, info->device_name,info->xmit_cnt );
2315 if ( info->params.mode == MGSL_MODE_HDLC ||
2316 info->params.mode == MGSL_MODE_RAW ) {
2317 /* operating in synchronous (frame oriented) mode */
2318 if ( info->tx_active )
2319 return info->max_frame_size;
2324 return info->xmit_cnt;
2325 } /* end of mgsl_chars_in_buffer() */
2327 /* mgsl_flush_buffer()
2329 * Discard all data in the send buffer
2331 * Arguments: tty pointer to tty info structure
2332 * Return Value: None
2334 static void mgsl_flush_buffer(struct tty_struct *tty)
2336 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2337 unsigned long flags;
2339 if (debug_level >= DEBUG_LEVEL_INFO)
2340 printk("%s(%d):mgsl_flush_buffer(%s) entry\n",
2341 __FILE__,__LINE__, info->device_name );
2343 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_buffer"))
2346 spin_lock_irqsave(&info->irq_spinlock,flags);
2347 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
2348 del_timer(&info->tx_timer);
2349 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2351 wake_up_interruptible(&tty->write_wait);
2355 /* mgsl_send_xchar()
2357 * Send a high-priority XON/XOFF character
2359 * Arguments: tty pointer to tty info structure
2360 * ch character to send
2361 * Return Value: None
2363 static void mgsl_send_xchar(struct tty_struct *tty, char ch)
2365 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2366 unsigned long flags;
2368 if (debug_level >= DEBUG_LEVEL_INFO)
2369 printk("%s(%d):mgsl_send_xchar(%s,%d)\n",
2370 __FILE__,__LINE__, info->device_name, ch );
2372 if (mgsl_paranoia_check(info, tty->name, "mgsl_send_xchar"))
2377 /* Make sure transmit interrupts are on */
2378 spin_lock_irqsave(&info->irq_spinlock,flags);
2379 if (!info->tx_enabled)
2380 usc_start_transmitter(info);
2381 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2383 } /* end of mgsl_send_xchar() */
2387 * Signal remote device to throttle send data (our receive data)
2389 * Arguments: tty pointer to tty info structure
2390 * Return Value: None
2392 static void mgsl_throttle(struct tty_struct * tty)
2394 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2395 unsigned long flags;
2397 if (debug_level >= DEBUG_LEVEL_INFO)
2398 printk("%s(%d):mgsl_throttle(%s) entry\n",
2399 __FILE__,__LINE__, info->device_name );
2401 if (mgsl_paranoia_check(info, tty->name, "mgsl_throttle"))
2405 mgsl_send_xchar(tty, STOP_CHAR(tty));
2407 if (tty->termios->c_cflag & CRTSCTS) {
2408 spin_lock_irqsave(&info->irq_spinlock,flags);
2409 info->serial_signals &= ~SerialSignal_RTS;
2410 usc_set_serial_signals(info);
2411 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2413 } /* end of mgsl_throttle() */
2415 /* mgsl_unthrottle()
2417 * Signal remote device to stop throttling send data (our receive data)
2419 * Arguments: tty pointer to tty info structure
2420 * Return Value: None
2422 static void mgsl_unthrottle(struct tty_struct * tty)
2424 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2425 unsigned long flags;
2427 if (debug_level >= DEBUG_LEVEL_INFO)
2428 printk("%s(%d):mgsl_unthrottle(%s) entry\n",
2429 __FILE__,__LINE__, info->device_name );
2431 if (mgsl_paranoia_check(info, tty->name, "mgsl_unthrottle"))
2438 mgsl_send_xchar(tty, START_CHAR(tty));
2441 if (tty->termios->c_cflag & CRTSCTS) {
2442 spin_lock_irqsave(&info->irq_spinlock,flags);
2443 info->serial_signals |= SerialSignal_RTS;
2444 usc_set_serial_signals(info);
2445 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2448 } /* end of mgsl_unthrottle() */
2452 * get the current serial parameters information
2454 * Arguments: info pointer to device instance data
2455 * user_icount pointer to buffer to hold returned stats
2457 * Return Value: 0 if success, otherwise error code
2459 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount __user *user_icount)
2463 if (debug_level >= DEBUG_LEVEL_INFO)
2464 printk("%s(%d):mgsl_get_params(%s)\n",
2465 __FILE__,__LINE__, info->device_name);
2468 memset(&info->icount, 0, sizeof(info->icount));
2470 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2477 } /* end of mgsl_get_stats() */
2479 /* mgsl_get_params()
2481 * get the current serial parameters information
2483 * Arguments: info pointer to device instance data
2484 * user_params pointer to buffer to hold returned params
2486 * Return Value: 0 if success, otherwise error code
2488 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params)
2491 if (debug_level >= DEBUG_LEVEL_INFO)
2492 printk("%s(%d):mgsl_get_params(%s)\n",
2493 __FILE__,__LINE__, info->device_name);
2495 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2497 if ( debug_level >= DEBUG_LEVEL_INFO )
2498 printk( "%s(%d):mgsl_get_params(%s) user buffer copy failed\n",
2499 __FILE__,__LINE__,info->device_name);
2505 } /* end of mgsl_get_params() */
2507 /* mgsl_set_params()
2509 * set the serial parameters
2513 * info pointer to device instance data
2514 * new_params user buffer containing new serial params
2516 * Return Value: 0 if success, otherwise error code
2518 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params)
2520 unsigned long flags;
2521 MGSL_PARAMS tmp_params;
2524 if (debug_level >= DEBUG_LEVEL_INFO)
2525 printk("%s(%d):mgsl_set_params %s\n", __FILE__,__LINE__,
2526 info->device_name );
2527 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2529 if ( debug_level >= DEBUG_LEVEL_INFO )
2530 printk( "%s(%d):mgsl_set_params(%s) user buffer copy failed\n",
2531 __FILE__,__LINE__,info->device_name);
2535 spin_lock_irqsave(&info->irq_spinlock,flags);
2536 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2537 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2539 mgsl_change_params(info);
2543 } /* end of mgsl_set_params() */
2545 /* mgsl_get_txidle()
2547 * get the current transmit idle mode
2549 * Arguments: info pointer to device instance data
2550 * idle_mode pointer to buffer to hold returned idle mode
2552 * Return Value: 0 if success, otherwise error code
2554 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode)
2558 if (debug_level >= DEBUG_LEVEL_INFO)
2559 printk("%s(%d):mgsl_get_txidle(%s)=%d\n",
2560 __FILE__,__LINE__, info->device_name, info->idle_mode);
2562 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2564 if ( debug_level >= DEBUG_LEVEL_INFO )
2565 printk( "%s(%d):mgsl_get_txidle(%s) user buffer copy failed\n",
2566 __FILE__,__LINE__,info->device_name);
2572 } /* end of mgsl_get_txidle() */
2574 /* mgsl_set_txidle() service ioctl to set transmit idle mode
2576 * Arguments: info pointer to device instance data
2577 * idle_mode new idle mode
2579 * Return Value: 0 if success, otherwise error code
2581 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode)
2583 unsigned long flags;
2585 if (debug_level >= DEBUG_LEVEL_INFO)
2586 printk("%s(%d):mgsl_set_txidle(%s,%d)\n", __FILE__,__LINE__,
2587 info->device_name, idle_mode );
2589 spin_lock_irqsave(&info->irq_spinlock,flags);
2590 info->idle_mode = idle_mode;
2591 usc_set_txidle( info );
2592 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2595 } /* end of mgsl_set_txidle() */
2599 * enable or disable the transmitter
2603 * info pointer to device instance data
2604 * enable 1 = enable, 0 = disable
2606 * Return Value: 0 if success, otherwise error code
2608 static int mgsl_txenable(struct mgsl_struct * info, int enable)
2610 unsigned long flags;
2612 if (debug_level >= DEBUG_LEVEL_INFO)
2613 printk("%s(%d):mgsl_txenable(%s,%d)\n", __FILE__,__LINE__,
2614 info->device_name, enable);
2616 spin_lock_irqsave(&info->irq_spinlock,flags);
2618 if ( !info->tx_enabled ) {
2620 usc_start_transmitter(info);
2621 /*--------------------------------------------------
2622 * if HDLC/SDLC Loop mode, attempt to insert the
2623 * station in the 'loop' by setting CMR:13. Upon
2624 * receipt of the next GoAhead (RxAbort) sequence,
2625 * the OnLoop indicator (CCSR:7) should go active
2626 * to indicate that we are on the loop
2627 *--------------------------------------------------*/
2628 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2629 usc_loopmode_insert_request( info );
2632 if ( info->tx_enabled )
2633 usc_stop_transmitter(info);
2635 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2638 } /* end of mgsl_txenable() */
2640 /* mgsl_txabort() abort send HDLC frame
2642 * Arguments: info pointer to device instance data
2643 * Return Value: 0 if success, otherwise error code
2645 static int mgsl_txabort(struct mgsl_struct * info)
2647 unsigned long flags;
2649 if (debug_level >= DEBUG_LEVEL_INFO)
2650 printk("%s(%d):mgsl_txabort(%s)\n", __FILE__,__LINE__,
2653 spin_lock_irqsave(&info->irq_spinlock,flags);
2654 if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC )
2656 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2657 usc_loopmode_cancel_transmit( info );
2659 usc_TCmd(info,TCmd_SendAbort);
2661 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2664 } /* end of mgsl_txabort() */
2666 /* mgsl_rxenable() enable or disable the receiver
2668 * Arguments: info pointer to device instance data
2669 * enable 1 = enable, 0 = disable
2670 * Return Value: 0 if success, otherwise error code
2672 static int mgsl_rxenable(struct mgsl_struct * info, int enable)
2674 unsigned long flags;
2676 if (debug_level >= DEBUG_LEVEL_INFO)
2677 printk("%s(%d):mgsl_rxenable(%s,%d)\n", __FILE__,__LINE__,
2678 info->device_name, enable);
2680 spin_lock_irqsave(&info->irq_spinlock,flags);
2682 if ( !info->rx_enabled )
2683 usc_start_receiver(info);
2685 if ( info->rx_enabled )
2686 usc_stop_receiver(info);
2688 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2691 } /* end of mgsl_rxenable() */
2693 /* mgsl_wait_event() wait for specified event to occur
2695 * Arguments: info pointer to device instance data
2696 * mask pointer to bitmask of events to wait for
2697 * Return Value: 0 if successful and bit mask updated with
2698 * of events triggerred,
2699 * otherwise error code
2701 static int mgsl_wait_event(struct mgsl_struct * info, int __user * mask_ptr)
2703 unsigned long flags;
2706 struct mgsl_icount cprev, cnow;
2709 struct _input_signal_events oldsigs, newsigs;
2710 DECLARE_WAITQUEUE(wait, current);
2712 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
2717 if (debug_level >= DEBUG_LEVEL_INFO)
2718 printk("%s(%d):mgsl_wait_event(%s,%d)\n", __FILE__,__LINE__,
2719 info->device_name, mask);
2721 spin_lock_irqsave(&info->irq_spinlock,flags);
2723 /* return immediately if state matches requested events */
2724 usc_get_serial_signals(info);
2725 s = info->serial_signals;
2727 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2728 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2729 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2730 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2732 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2736 /* save current irq counts */
2737 cprev = info->icount;
2738 oldsigs = info->input_signal_events;
2740 /* enable hunt and idle irqs if needed */
2741 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2742 u16 oldreg = usc_InReg(info,RICR);
2743 u16 newreg = oldreg +
2744 (mask & MgslEvent_ExitHuntMode ? RXSTATUS_EXITED_HUNT:0) +
2745 (mask & MgslEvent_IdleReceived ? RXSTATUS_IDLE_RECEIVED:0);
2746 if (oldreg != newreg)
2747 usc_OutReg(info, RICR, newreg);
2750 set_current_state(TASK_INTERRUPTIBLE);
2751 add_wait_queue(&info->event_wait_q, &wait);
2753 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2758 if (signal_pending(current)) {
2763 /* get current irq counts */
2764 spin_lock_irqsave(&info->irq_spinlock,flags);
2765 cnow = info->icount;
2766 newsigs = info->input_signal_events;
2767 set_current_state(TASK_INTERRUPTIBLE);
2768 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2770 /* if no change, wait aborted for some reason */
2771 if (newsigs.dsr_up == oldsigs.dsr_up &&
2772 newsigs.dsr_down == oldsigs.dsr_down &&
2773 newsigs.dcd_up == oldsigs.dcd_up &&
2774 newsigs.dcd_down == oldsigs.dcd_down &&
2775 newsigs.cts_up == oldsigs.cts_up &&
2776 newsigs.cts_down == oldsigs.cts_down &&
2777 newsigs.ri_up == oldsigs.ri_up &&
2778 newsigs.ri_down == oldsigs.ri_down &&
2779 cnow.exithunt == cprev.exithunt &&
2780 cnow.rxidle == cprev.rxidle) {
2786 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2787 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2788 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2789 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2790 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2791 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2792 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2793 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2794 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2795 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2803 remove_wait_queue(&info->event_wait_q, &wait);
2804 set_current_state(TASK_RUNNING);
2806 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2807 spin_lock_irqsave(&info->irq_spinlock,flags);
2808 if (!waitqueue_active(&info->event_wait_q)) {
2809 /* disable enable exit hunt mode/idle rcvd IRQs */
2810 usc_OutReg(info, RICR, usc_InReg(info,RICR) &
2811 ~(RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED));
2813 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2817 PUT_USER(rc, events, mask_ptr);
2821 } /* end of mgsl_wait_event() */
2823 static int modem_input_wait(struct mgsl_struct *info,int arg)
2825 unsigned long flags;
2827 struct mgsl_icount cprev, cnow;
2828 DECLARE_WAITQUEUE(wait, current);
2830 /* save current irq counts */
2831 spin_lock_irqsave(&info->irq_spinlock,flags);
2832 cprev = info->icount;
2833 add_wait_queue(&info->status_event_wait_q, &wait);
2834 set_current_state(TASK_INTERRUPTIBLE);
2835 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2839 if (signal_pending(current)) {
2844 /* get new irq counts */
2845 spin_lock_irqsave(&info->irq_spinlock,flags);
2846 cnow = info->icount;
2847 set_current_state(TASK_INTERRUPTIBLE);
2848 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2850 /* if no change, wait aborted for some reason */
2851 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2852 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2857 /* check for change in caller specified modem input */
2858 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2859 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2860 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2861 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2868 remove_wait_queue(&info->status_event_wait_q, &wait);
2869 set_current_state(TASK_RUNNING);
2873 /* return the state of the serial control and status signals
2875 static int tiocmget(struct tty_struct *tty, struct file *file)
2877 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2878 unsigned int result;
2879 unsigned long flags;
2881 spin_lock_irqsave(&info->irq_spinlock,flags);
2882 usc_get_serial_signals(info);
2883 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2885 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2886 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2887 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2888 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
2889 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2890 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2892 if (debug_level >= DEBUG_LEVEL_INFO)
2893 printk("%s(%d):%s tiocmget() value=%08X\n",
2894 __FILE__,__LINE__, info->device_name, result );
2898 /* set modem control signals (DTR/RTS)
2900 static int tiocmset(struct tty_struct *tty, struct file *file,
2901 unsigned int set, unsigned int clear)
2903 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2904 unsigned long flags;
2906 if (debug_level >= DEBUG_LEVEL_INFO)
2907 printk("%s(%d):%s tiocmset(%x,%x)\n",
2908 __FILE__,__LINE__,info->device_name, set, clear);
2910 if (set & TIOCM_RTS)
2911 info->serial_signals |= SerialSignal_RTS;
2912 if (set & TIOCM_DTR)
2913 info->serial_signals |= SerialSignal_DTR;
2914 if (clear & TIOCM_RTS)
2915 info->serial_signals &= ~SerialSignal_RTS;
2916 if (clear & TIOCM_DTR)
2917 info->serial_signals &= ~SerialSignal_DTR;
2919 spin_lock_irqsave(&info->irq_spinlock,flags);
2920 usc_set_serial_signals(info);
2921 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2926 /* mgsl_break() Set or clear transmit break condition
2928 * Arguments: tty pointer to tty instance data
2929 * break_state -1=set break condition, 0=clear
2930 * Return Value: None
2932 static void mgsl_break(struct tty_struct *tty, int break_state)
2934 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
2935 unsigned long flags;
2937 if (debug_level >= DEBUG_LEVEL_INFO)
2938 printk("%s(%d):mgsl_break(%s,%d)\n",
2939 __FILE__,__LINE__, info->device_name, break_state);
2941 if (mgsl_paranoia_check(info, tty->name, "mgsl_break"))
2944 spin_lock_irqsave(&info->irq_spinlock,flags);
2945 if (break_state == -1)
2946 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) | BIT7));
2948 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) & ~BIT7));
2949 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2951 } /* end of mgsl_break() */
2953 /* mgsl_ioctl() Service an IOCTL request
2957 * tty pointer to tty instance data
2958 * file pointer to associated file object for device
2959 * cmd IOCTL command code
2960 * arg command argument/context
2962 * Return Value: 0 if success, otherwise error code
2964 static int mgsl_ioctl(struct tty_struct *tty, struct file * file,
2965 unsigned int cmd, unsigned long arg)
2967 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
2969 if (debug_level >= DEBUG_LEVEL_INFO)
2970 printk("%s(%d):mgsl_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2971 info->device_name, cmd );
2973 if (mgsl_paranoia_check(info, tty->name, "mgsl_ioctl"))
2976 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2977 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
2978 if (tty->flags & (1 << TTY_IO_ERROR))
2982 return mgsl_ioctl_common(info, cmd, arg);
2985 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg)
2988 struct mgsl_icount cnow; /* kernel counter temps */
2989 void __user *argp = (void __user *)arg;
2990 struct serial_icounter_struct __user *p_cuser; /* user space */
2991 unsigned long flags;
2994 case MGSL_IOCGPARAMS:
2995 return mgsl_get_params(info, argp);
2996 case MGSL_IOCSPARAMS:
2997 return mgsl_set_params(info, argp);
2998 case MGSL_IOCGTXIDLE:
2999 return mgsl_get_txidle(info, argp);
3000 case MGSL_IOCSTXIDLE:
3001 return mgsl_set_txidle(info,(int)arg);
3002 case MGSL_IOCTXENABLE:
3003 return mgsl_txenable(info,(int)arg);
3004 case MGSL_IOCRXENABLE:
3005 return mgsl_rxenable(info,(int)arg);
3006 case MGSL_IOCTXABORT:
3007 return mgsl_txabort(info);
3008 case MGSL_IOCGSTATS:
3009 return mgsl_get_stats(info, argp);
3010 case MGSL_IOCWAITEVENT:
3011 return mgsl_wait_event(info, argp);
3012 case MGSL_IOCLOOPTXDONE:
3013 return mgsl_loopmode_send_done(info);
3014 /* Wait for modem input (DCD,RI,DSR,CTS) change
3015 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
3018 return modem_input_wait(info,(int)arg);
3021 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
3022 * Return: write counters to the user passed counter struct
3023 * NB: both 1->0 and 0->1 transitions are counted except for
3024 * RI where only 0->1 is counted.
3027 spin_lock_irqsave(&info->irq_spinlock,flags);
3028 cnow = info->icount;
3029 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3031 PUT_USER(error,cnow.cts, &p_cuser->cts);
3032 if (error) return error;
3033 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
3034 if (error) return error;
3035 PUT_USER(error,cnow.rng, &p_cuser->rng);
3036 if (error) return error;
3037 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
3038 if (error) return error;
3039 PUT_USER(error,cnow.rx, &p_cuser->rx);
3040 if (error) return error;
3041 PUT_USER(error,cnow.tx, &p_cuser->tx);
3042 if (error) return error;
3043 PUT_USER(error,cnow.frame, &p_cuser->frame);
3044 if (error) return error;
3045 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
3046 if (error) return error;
3047 PUT_USER(error,cnow.parity, &p_cuser->parity);
3048 if (error) return error;
3049 PUT_USER(error,cnow.brk, &p_cuser->brk);
3050 if (error) return error;
3051 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
3052 if (error) return error;
3055 return -ENOIOCTLCMD;
3060 /* mgsl_set_termios()
3062 * Set new termios settings
3066 * tty pointer to tty structure
3067 * termios pointer to buffer to hold returned old termios
3069 * Return Value: None
3071 static void mgsl_set_termios(struct tty_struct *tty, struct termios *old_termios)
3073 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
3074 unsigned long flags;
3076 if (debug_level >= DEBUG_LEVEL_INFO)
3077 printk("%s(%d):mgsl_set_termios %s\n", __FILE__,__LINE__,
3078 tty->driver->name );
3080 /* just return if nothing has changed */
3081 if ((tty->termios->c_cflag == old_termios->c_cflag)
3082 && (RELEVANT_IFLAG(tty->termios->c_iflag)
3083 == RELEVANT_IFLAG(old_termios->c_iflag)))
3086 mgsl_change_params(info);
3088 /* Handle transition to B0 status */
3089 if (old_termios->c_cflag & CBAUD &&
3090 !(tty->termios->c_cflag & CBAUD)) {
3091 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3092 spin_lock_irqsave(&info->irq_spinlock,flags);
3093 usc_set_serial_signals(info);
3094 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3097 /* Handle transition away from B0 status */
3098 if (!(old_termios->c_cflag & CBAUD) &&
3099 tty->termios->c_cflag & CBAUD) {
3100 info->serial_signals |= SerialSignal_DTR;
3101 if (!(tty->termios->c_cflag & CRTSCTS) ||
3102 !test_bit(TTY_THROTTLED, &tty->flags)) {
3103 info->serial_signals |= SerialSignal_RTS;
3105 spin_lock_irqsave(&info->irq_spinlock,flags);
3106 usc_set_serial_signals(info);
3107 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3110 /* Handle turning off CRTSCTS */
3111 if (old_termios->c_cflag & CRTSCTS &&
3112 !(tty->termios->c_cflag & CRTSCTS)) {
3113 tty->hw_stopped = 0;
3117 } /* end of mgsl_set_termios() */
3121 * Called when port is closed. Wait for remaining data to be
3122 * sent. Disable port and free resources.
3126 * tty pointer to open tty structure
3127 * filp pointer to open file object
3129 * Return Value: None
3131 static void mgsl_close(struct tty_struct *tty, struct file * filp)
3133 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3135 if (mgsl_paranoia_check(info, tty->name, "mgsl_close"))
3138 if (debug_level >= DEBUG_LEVEL_INFO)
3139 printk("%s(%d):mgsl_close(%s) entry, count=%d\n",
3140 __FILE__,__LINE__, info->device_name, info->count);
3145 if (tty_hung_up_p(filp))
3148 if ((tty->count == 1) && (info->count != 1)) {
3150 * tty->count is 1 and the tty structure will be freed.
3151 * info->count should be one in this case.
3152 * if it's not, correct it so that the port is shutdown.
3154 printk("mgsl_close: bad refcount; tty->count is 1, "
3155 "info->count is %d\n", info->count);
3161 /* if at least one open remaining, leave hardware active */
3165 info->flags |= ASYNC_CLOSING;
3167 /* set tty->closing to notify line discipline to
3168 * only process XON/XOFF characters. Only the N_TTY
3169 * discipline appears to use this (ppp does not).
3173 /* wait for transmit data to clear all layers */
3175 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
3176 if (debug_level >= DEBUG_LEVEL_INFO)
3177 printk("%s(%d):mgsl_close(%s) calling tty_wait_until_sent\n",
3178 __FILE__,__LINE__, info->device_name );
3179 tty_wait_until_sent(tty, info->closing_wait);
3182 if (info->flags & ASYNC_INITIALIZED)
3183 mgsl_wait_until_sent(tty, info->timeout);
3185 if (tty->driver->flush_buffer)
3186 tty->driver->flush_buffer(tty);
3188 tty_ldisc_flush(tty);
3195 if (info->blocked_open) {
3196 if (info->close_delay) {
3197 msleep_interruptible(jiffies_to_msecs(info->close_delay));
3199 wake_up_interruptible(&info->open_wait);
3202 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
3204 wake_up_interruptible(&info->close_wait);
3207 if (debug_level >= DEBUG_LEVEL_INFO)
3208 printk("%s(%d):mgsl_close(%s) exit, count=%d\n", __FILE__,__LINE__,
3209 tty->driver->name, info->count);
3211 } /* end of mgsl_close() */
3213 /* mgsl_wait_until_sent()
3215 * Wait until the transmitter is empty.
3219 * tty pointer to tty info structure
3220 * timeout time to wait for send completion
3222 * Return Value: None
3224 static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout)
3226 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3227 unsigned long orig_jiffies, char_time;
3232 if (debug_level >= DEBUG_LEVEL_INFO)
3233 printk("%s(%d):mgsl_wait_until_sent(%s) entry\n",
3234 __FILE__,__LINE__, info->device_name );
3236 if (mgsl_paranoia_check(info, tty->name, "mgsl_wait_until_sent"))
3239 if (!(info->flags & ASYNC_INITIALIZED))
3242 orig_jiffies = jiffies;
3244 /* Set check interval to 1/5 of estimated time to
3245 * send a character, and make it at least 1. The check
3246 * interval should also be less than the timeout.
3247 * Note: use tight timings here to satisfy the NIST-PCTS.
3250 if ( info->params.data_rate ) {
3251 char_time = info->timeout/(32 * 5);
3258 char_time = min_t(unsigned long, char_time, timeout);
3260 if ( info->params.mode == MGSL_MODE_HDLC ||
3261 info->params.mode == MGSL_MODE_RAW ) {
3262 while (info->tx_active) {
3263 msleep_interruptible(jiffies_to_msecs(char_time));
3264 if (signal_pending(current))
3266 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3270 while (!(usc_InReg(info,TCSR) & TXSTATUS_ALL_SENT) &&
3272 msleep_interruptible(jiffies_to_msecs(char_time));
3273 if (signal_pending(current))
3275 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3281 if (debug_level >= DEBUG_LEVEL_INFO)
3282 printk("%s(%d):mgsl_wait_until_sent(%s) exit\n",
3283 __FILE__,__LINE__, info->device_name );
3285 } /* end of mgsl_wait_until_sent() */
3289 * Called by tty_hangup() when a hangup is signaled.
3290 * This is the same as to closing all open files for the port.
3292 * Arguments: tty pointer to associated tty object
3293 * Return Value: None
3295 static void mgsl_hangup(struct tty_struct *tty)
3297 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3299 if (debug_level >= DEBUG_LEVEL_INFO)
3300 printk("%s(%d):mgsl_hangup(%s)\n",
3301 __FILE__,__LINE__, info->device_name );
3303 if (mgsl_paranoia_check(info, tty->name, "mgsl_hangup"))
3306 mgsl_flush_buffer(tty);
3310 info->flags &= ~ASYNC_NORMAL_ACTIVE;
3313 wake_up_interruptible(&info->open_wait);
3315 } /* end of mgsl_hangup() */
3317 /* block_til_ready()
3319 * Block the current process until the specified port
3320 * is ready to be opened.
3324 * tty pointer to tty info structure
3325 * filp pointer to open file object
3326 * info pointer to device instance data
3328 * Return Value: 0 if success, otherwise error code
3330 static int block_til_ready(struct tty_struct *tty, struct file * filp,
3331 struct mgsl_struct *info)
3333 DECLARE_WAITQUEUE(wait, current);
3335 int do_clocal = 0, extra_count = 0;
3336 unsigned long flags;
3338 if (debug_level >= DEBUG_LEVEL_INFO)
3339 printk("%s(%d):block_til_ready on %s\n",
3340 __FILE__,__LINE__, tty->driver->name );
3342 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3343 /* nonblock mode is set or port is not enabled */
3344 info->flags |= ASYNC_NORMAL_ACTIVE;
3348 if (tty->termios->c_cflag & CLOCAL)
3351 /* Wait for carrier detect and the line to become
3352 * free (i.e., not in use by the callout). While we are in
3353 * this loop, info->count is dropped by one, so that
3354 * mgsl_close() knows when to free things. We restore it upon
3355 * exit, either normal or abnormal.
3359 add_wait_queue(&info->open_wait, &wait);
3361 if (debug_level >= DEBUG_LEVEL_INFO)
3362 printk("%s(%d):block_til_ready before block on %s count=%d\n",
3363 __FILE__,__LINE__, tty->driver->name, info->count );
3365 spin_lock_irqsave(&info->irq_spinlock, flags);
3366 if (!tty_hung_up_p(filp)) {
3370 spin_unlock_irqrestore(&info->irq_spinlock, flags);
3371 info->blocked_open++;
3374 if (tty->termios->c_cflag & CBAUD) {
3375 spin_lock_irqsave(&info->irq_spinlock,flags);
3376 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3377 usc_set_serial_signals(info);
3378 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3381 set_current_state(TASK_INTERRUPTIBLE);
3383 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
3384 retval = (info->flags & ASYNC_HUP_NOTIFY) ?
3385 -EAGAIN : -ERESTARTSYS;
3389 spin_lock_irqsave(&info->irq_spinlock,flags);
3390 usc_get_serial_signals(info);
3391 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3393 if (!(info->flags & ASYNC_CLOSING) &&
3394 (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
3398 if (signal_pending(current)) {
3399 retval = -ERESTARTSYS;
3403 if (debug_level >= DEBUG_LEVEL_INFO)
3404 printk("%s(%d):block_til_ready blocking on %s count=%d\n",
3405 __FILE__,__LINE__, tty->driver->name, info->count );
3410 set_current_state(TASK_RUNNING);
3411 remove_wait_queue(&info->open_wait, &wait);
3415 info->blocked_open--;
3417 if (debug_level >= DEBUG_LEVEL_INFO)
3418 printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
3419 __FILE__,__LINE__, tty->driver->name, info->count );
3422 info->flags |= ASYNC_NORMAL_ACTIVE;
3426 } /* end of block_til_ready() */
3430 * Called when a port is opened. Init and enable port.
3431 * Perform serial-specific initialization for the tty structure.
3433 * Arguments: tty pointer to tty info structure
3434 * filp associated file pointer
3436 * Return Value: 0 if success, otherwise error code
3438 static int mgsl_open(struct tty_struct *tty, struct file * filp)
3440 struct mgsl_struct *info;
3443 unsigned long flags;
3445 /* verify range of specified line number */
3447 if ((line < 0) || (line >= mgsl_device_count)) {
3448 printk("%s(%d):mgsl_open with invalid line #%d.\n",
3449 __FILE__,__LINE__,line);
3453 /* find the info structure for the specified line */
3454 info = mgsl_device_list;
3455 while(info && info->line != line)
3456 info = info->next_device;
3457 if (mgsl_paranoia_check(info, tty->name, "mgsl_open"))
3460 tty->driver_data = info;
3463 if (debug_level >= DEBUG_LEVEL_INFO)
3464 printk("%s(%d):mgsl_open(%s), old ref count = %d\n",
3465 __FILE__,__LINE__,tty->driver->name, info->count);
3467 /* If port is closing, signal caller to try again */
3468 if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
3469 if (info->flags & ASYNC_CLOSING)
3470 interruptible_sleep_on(&info->close_wait);
3471 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
3472 -EAGAIN : -ERESTARTSYS);
3477 page = get_zeroed_page(GFP_KERNEL);
3485 tmp_buf = (unsigned char *) page;
3488 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
3490 spin_lock_irqsave(&info->netlock, flags);
3491 if (info->netcount) {
3493 spin_unlock_irqrestore(&info->netlock, flags);
3497 spin_unlock_irqrestore(&info->netlock, flags);
3499 if (info->count == 1) {
3500 /* 1st open on this device, init hardware */
3501 retval = startup(info);
3506 retval = block_til_ready(tty, filp, info);
3508 if (debug_level >= DEBUG_LEVEL_INFO)
3509 printk("%s(%d):block_til_ready(%s) returned %d\n",
3510 __FILE__,__LINE__, info->device_name, retval);
3514 if (debug_level >= DEBUG_LEVEL_INFO)
3515 printk("%s(%d):mgsl_open(%s) success\n",
3516 __FILE__,__LINE__, info->device_name);
3521 if (tty->count == 1)
3522 info->tty = NULL; /* tty layer will release tty struct */
3529 } /* end of mgsl_open() */
3532 * /proc fs routines....
3535 static inline int line_info(char *buf, struct mgsl_struct *info)
3539 unsigned long flags;
3541 if (info->bus_type == MGSL_BUS_TYPE_PCI) {
3542 ret = sprintf(buf, "%s:PCI io:%04X irq:%d mem:%08X lcr:%08X",
3543 info->device_name, info->io_base, info->irq_level,
3544 info->phys_memory_base, info->phys_lcr_base);
3546 ret = sprintf(buf, "%s:(E)ISA io:%04X irq:%d dma:%d",
3547 info->device_name, info->io_base,
3548 info->irq_level, info->dma_level);
3551 /* output current serial signal states */
3552 spin_lock_irqsave(&info->irq_spinlock,flags);
3553 usc_get_serial_signals(info);
3554 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3558 if (info->serial_signals & SerialSignal_RTS)
3559 strcat(stat_buf, "|RTS");
3560 if (info->serial_signals & SerialSignal_CTS)
3561 strcat(stat_buf, "|CTS");
3562 if (info->serial_signals & SerialSignal_DTR)
3563 strcat(stat_buf, "|DTR");
3564 if (info->serial_signals & SerialSignal_DSR)
3565 strcat(stat_buf, "|DSR");
3566 if (info->serial_signals & SerialSignal_DCD)
3567 strcat(stat_buf, "|CD");
3568 if (info->serial_signals & SerialSignal_RI)
3569 strcat(stat_buf, "|RI");
3571 if (info->params.mode == MGSL_MODE_HDLC ||
3572 info->params.mode == MGSL_MODE_RAW ) {
3573 ret += sprintf(buf+ret, " HDLC txok:%d rxok:%d",
3574 info->icount.txok, info->icount.rxok);
3575 if (info->icount.txunder)
3576 ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
3577 if (info->icount.txabort)
3578 ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
3579 if (info->icount.rxshort)
3580 ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
3581 if (info->icount.rxlong)
3582 ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
3583 if (info->icount.rxover)
3584 ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
3585 if (info->icount.rxcrc)
3586 ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
3588 ret += sprintf(buf+ret, " ASYNC tx:%d rx:%d",
3589 info->icount.tx, info->icount.rx);
3590 if (info->icount.frame)
3591 ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
3592 if (info->icount.parity)
3593 ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
3594 if (info->icount.brk)
3595 ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
3596 if (info->icount.overrun)
3597 ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
3600 /* Append serial signal status to end */
3601 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
3603 ret += sprintf(buf+ret, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
3604 info->tx_active,info->bh_requested,info->bh_running,
3607 spin_lock_irqsave(&info->irq_spinlock,flags);
3609 u16 Tcsr = usc_InReg( info, TCSR );
3610 u16 Tdmr = usc_InDmaReg( info, TDMR );
3611 u16 Ticr = usc_InReg( info, TICR );
3612 u16 Rscr = usc_InReg( info, RCSR );
3613 u16 Rdmr = usc_InDmaReg( info, RDMR );
3614 u16 Ricr = usc_InReg( info, RICR );
3615 u16 Icr = usc_InReg( info, ICR );
3616 u16 Dccr = usc_InReg( info, DCCR );
3617 u16 Tmr = usc_InReg( info, TMR );
3618 u16 Tccr = usc_InReg( info, TCCR );
3619 u16 Ccar = inw( info->io_base + CCAR );
3620 ret += sprintf(buf+ret, "tcsr=%04X tdmr=%04X ticr=%04X rcsr=%04X rdmr=%04X\n"
3621 "ricr=%04X icr =%04X dccr=%04X tmr=%04X tccr=%04X ccar=%04X\n",
3622 Tcsr,Tdmr,Ticr,Rscr,Rdmr,Ricr,Icr,Dccr,Tmr,Tccr,Ccar );
3624 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3628 } /* end of line_info() */
3632 * Called to print information about devices
3635 * page page of memory to hold returned info
3644 static int mgsl_read_proc(char *page, char **start, off_t off, int count,
3645 int *eof, void *data)
3649 struct mgsl_struct *info;
3651 len += sprintf(page, "synclink driver:%s\n", driver_version);
3653 info = mgsl_device_list;
3655 l = line_info(page + len, info);
3657 if (len+begin > off+count)
3659 if (len+begin < off) {
3663 info = info->next_device;
3668 if (off >= len+begin)
3670 *start = page + (off-begin);
3671 return ((count < begin+len-off) ? count : begin+len-off);
3673 } /* end of mgsl_read_proc() */
3675 /* mgsl_allocate_dma_buffers()
3677 * Allocate and format DMA buffers (ISA adapter)
3678 * or format shared memory buffers (PCI adapter).
3680 * Arguments: info pointer to device instance data
3681 * Return Value: 0 if success, otherwise error
3683 static int mgsl_allocate_dma_buffers(struct mgsl_struct *info)
3685 unsigned short BuffersPerFrame;
3687 info->last_mem_alloc = 0;
3689 /* Calculate the number of DMA buffers necessary to hold the */
3690 /* largest allowable frame size. Note: If the max frame size is */
3691 /* not an even multiple of the DMA buffer size then we need to */
3692 /* round the buffer count per frame up one. */
3694 BuffersPerFrame = (unsigned short)(info->max_frame_size/DMABUFFERSIZE);
3695 if ( info->max_frame_size % DMABUFFERSIZE )
3698 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3700 * The PCI adapter has 256KBytes of shared memory to use.
3701 * This is 64 PAGE_SIZE buffers.
3703 * The first page is used for padding at this time so the
3704 * buffer list does not begin at offset 0 of the PCI
3705 * adapter's shared memory.
3707 * The 2nd page is used for the buffer list. A 4K buffer
3708 * list can hold 128 DMA_BUFFER structures at 32 bytes
3711 * This leaves 62 4K pages.
3713 * The next N pages are used for transmit frame(s). We
3714 * reserve enough 4K page blocks to hold the required
3715 * number of transmit dma buffers (num_tx_dma_buffers),
3716 * each of MaxFrameSize size.
3718 * Of the remaining pages (62-N), determine how many can
3719 * be used to receive full MaxFrameSize inbound frames
3721 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3722 info->rx_buffer_count = 62 - info->tx_buffer_count;
3724 /* Calculate the number of PAGE_SIZE buffers needed for */
3725 /* receive and transmit DMA buffers. */
3728 /* Calculate the number of DMA buffers necessary to */
3729 /* hold 7 max size receive frames and one max size transmit frame. */
3730 /* The receive buffer count is bumped by one so we avoid an */
3731 /* End of List condition if all receive buffers are used when */
3732 /* using linked list DMA buffers. */
3734 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3735 info->rx_buffer_count = (BuffersPerFrame * MAXRXFRAMES) + 6;
3738 * limit total TxBuffers & RxBuffers to 62 4K total
3739 * (ala PCI Allocation)
3742 if ( (info->tx_buffer_count + info->rx_buffer_count) > 62 )
3743 info->rx_buffer_count = 62 - info->tx_buffer_count;
3747 if ( debug_level >= DEBUG_LEVEL_INFO )
3748 printk("%s(%d):Allocating %d TX and %d RX DMA buffers.\n",
3749 __FILE__,__LINE__, info->tx_buffer_count,info->rx_buffer_count);
3751 if ( mgsl_alloc_buffer_list_memory( info ) < 0 ||
3752 mgsl_alloc_frame_memory(info, info->rx_buffer_list, info->rx_buffer_count) < 0 ||
3753 mgsl_alloc_frame_memory(info, info->tx_buffer_list, info->tx_buffer_count) < 0 ||
3754 mgsl_alloc_intermediate_rxbuffer_memory(info) < 0 ||
3755 mgsl_alloc_intermediate_txbuffer_memory(info) < 0 ) {
3756 printk("%s(%d):Can't allocate DMA buffer memory\n",__FILE__,__LINE__);
3760 mgsl_reset_rx_dma_buffers( info );
3761 mgsl_reset_tx_dma_buffers( info );
3765 } /* end of mgsl_allocate_dma_buffers() */
3768 * mgsl_alloc_buffer_list_memory()
3770 * Allocate a common DMA buffer for use as the
3771 * receive and transmit buffer lists.
3773 * A buffer list is a set of buffer entries where each entry contains
3774 * a pointer to an actual buffer and a pointer to the next buffer entry
3775 * (plus some other info about the buffer).
3777 * The buffer entries for a list are built to form a circular list so
3778 * that when the entire list has been traversed you start back at the
3781 * This function allocates memory for just the buffer entries.
3782 * The links (pointer to next entry) are filled in with the physical
3783 * address of the next entry so the adapter can navigate the list
3784 * using bus master DMA. The pointers to the actual buffers are filled
3785 * out later when the actual buffers are allocated.
3787 * Arguments: info pointer to device instance data
3788 * Return Value: 0 if success, otherwise error
3790 static int mgsl_alloc_buffer_list_memory( struct mgsl_struct *info )
3794 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3795 /* PCI adapter uses shared memory. */
3796 info->buffer_list = info->memory_base + info->last_mem_alloc;
3797 info->buffer_list_phys = info->last_mem_alloc;
3798 info->last_mem_alloc += BUFFERLISTSIZE;
3800 /* ISA adapter uses system memory. */
3801 /* The buffer lists are allocated as a common buffer that both */
3802 /* the processor and adapter can access. This allows the driver to */
3803 /* inspect portions of the buffer while other portions are being */
3804 /* updated by the adapter using Bus Master DMA. */
3806 info->buffer_list = dma_alloc_coherent(NULL, BUFFERLISTSIZE, &info->buffer_list_dma_addr, GFP_KERNEL);
3807 if (info->buffer_list == NULL)
3809 info->buffer_list_phys = (u32)(info->buffer_list_dma_addr);
3812 /* We got the memory for the buffer entry lists. */
3813 /* Initialize the memory block to all zeros. */
3814 memset( info->buffer_list, 0, BUFFERLISTSIZE );
3816 /* Save virtual address pointers to the receive and */
3817 /* transmit buffer lists. (Receive 1st). These pointers will */
3818 /* be used by the processor to access the lists. */
3819 info->rx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3820 info->tx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3821 info->tx_buffer_list += info->rx_buffer_count;
3824 * Build the links for the buffer entry lists such that
3825 * two circular lists are built. (Transmit and Receive).
3827 * Note: the links are physical addresses
3828 * which are read by the adapter to determine the next
3829 * buffer entry to use.
3832 for ( i = 0; i < info->rx_buffer_count; i++ ) {
3833 /* calculate and store physical address of this buffer entry */
3834 info->rx_buffer_list[i].phys_entry =
3835 info->buffer_list_phys + (i * sizeof(DMABUFFERENTRY));
3837 /* calculate and store physical address of */
3838 /* next entry in cirular list of entries */
3840 info->rx_buffer_list[i].link = info->buffer_list_phys;
3842 if ( i < info->rx_buffer_count - 1 )
3843 info->rx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3846 for ( i = 0; i < info->tx_buffer_count; i++ ) {
3847 /* calculate and store physical address of this buffer entry */
3848 info->tx_buffer_list[i].phys_entry = info->buffer_list_phys +
3849 ((info->rx_buffer_count + i) * sizeof(DMABUFFERENTRY));
3851 /* calculate and store physical address of */
3852 /* next entry in cirular list of entries */
3854 info->tx_buffer_list[i].link = info->buffer_list_phys +
3855 info->rx_buffer_count * sizeof(DMABUFFERENTRY);
3857 if ( i < info->tx_buffer_count - 1 )
3858 info->tx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3863 } /* end of mgsl_alloc_buffer_list_memory() */
3865 /* Free DMA buffers allocated for use as the
3866 * receive and transmit buffer lists.
3869 * The data transfer buffers associated with the buffer list
3870 * MUST be freed before freeing the buffer list itself because
3871 * the buffer list contains the information necessary to free
3872 * the individual buffers!
3874 static void mgsl_free_buffer_list_memory( struct mgsl_struct *info )
3876 if (info->buffer_list && info->bus_type != MGSL_BUS_TYPE_PCI)
3877 dma_free_coherent(NULL, BUFFERLISTSIZE, info->buffer_list, info->buffer_list_dma_addr);
3879 info->buffer_list = NULL;
3880 info->rx_buffer_list = NULL;
3881 info->tx_buffer_list = NULL;
3883 } /* end of mgsl_free_buffer_list_memory() */
3886 * mgsl_alloc_frame_memory()
3888 * Allocate the frame DMA buffers used by the specified buffer list.
3889 * Each DMA buffer will be one memory page in size. This is necessary
3890 * because memory can fragment enough that it may be impossible
3895 * info pointer to device instance data
3896 * BufferList pointer to list of buffer entries
3897 * Buffercount count of buffer entries in buffer list
3899 * Return Value: 0 if success, otherwise -ENOMEM
3901 static int mgsl_alloc_frame_memory(struct mgsl_struct *info,DMABUFFERENTRY *BufferList,int Buffercount)
3906 /* Allocate page sized buffers for the receive buffer list */
3908 for ( i = 0; i < Buffercount; i++ ) {
3909 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3910 /* PCI adapter uses shared memory buffers. */
3911 BufferList[i].virt_addr = info->memory_base + info->last_mem_alloc;
3912 phys_addr = info->last_mem_alloc;
3913 info->last_mem_alloc += DMABUFFERSIZE;
3915 /* ISA adapter uses system memory. */
3916 BufferList[i].virt_addr = dma_alloc_coherent(NULL, DMABUFFERSIZE, &BufferList[i].dma_addr, GFP_KERNEL);
3917 if (BufferList[i].virt_addr == NULL)
3919 phys_addr = (u32)(BufferList[i].dma_addr);
3921 BufferList[i].phys_addr = phys_addr;
3926 } /* end of mgsl_alloc_frame_memory() */
3929 * mgsl_free_frame_memory()
3931 * Free the buffers associated with
3932 * each buffer entry of a buffer list.
3936 * info pointer to device instance data
3937 * BufferList pointer to list of buffer entries
3938 * Buffercount count of buffer entries in buffer list
3940 * Return Value: None
3942 static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList, int Buffercount)
3947 for ( i = 0 ; i < Buffercount ; i++ ) {
3948 if ( BufferList[i].virt_addr ) {
3949 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
3950 dma_free_coherent(NULL, DMABUFFERSIZE, BufferList[i].virt_addr, BufferList[i].dma_addr);
3951 BufferList[i].virt_addr = NULL;
3956 } /* end of mgsl_free_frame_memory() */
3958 /* mgsl_free_dma_buffers()
3962 * Arguments: info pointer to device instance data
3963 * Return Value: None
3965 static void mgsl_free_dma_buffers( struct mgsl_struct *info )
3967 mgsl_free_frame_memory( info, info->rx_buffer_list, info->rx_buffer_count );
3968 mgsl_free_frame_memory( info, info->tx_buffer_list, info->tx_buffer_count );
3969 mgsl_free_buffer_list_memory( info );
3971 } /* end of mgsl_free_dma_buffers() */
3975 * mgsl_alloc_intermediate_rxbuffer_memory()
3977 * Allocate a buffer large enough to hold max_frame_size. This buffer
3978 * is used to pass an assembled frame to the line discipline.
3982 * info pointer to device instance data
3984 * Return Value: 0 if success, otherwise -ENOMEM
3986 static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info)
3988 info->intermediate_rxbuffer = kmalloc(info->max_frame_size, GFP_KERNEL | GFP_DMA);
3989 if ( info->intermediate_rxbuffer == NULL )
3994 } /* end of mgsl_alloc_intermediate_rxbuffer_memory() */
3997 * mgsl_free_intermediate_rxbuffer_memory()
4002 * info pointer to device instance data
4004 * Return Value: None
4006 static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info)
4008 kfree(info->intermediate_rxbuffer);
4009 info->intermediate_rxbuffer = NULL;
4011 } /* end of mgsl_free_intermediate_rxbuffer_memory() */
4014 * mgsl_alloc_intermediate_txbuffer_memory()
4016 * Allocate intermdiate transmit buffer(s) large enough to hold max_frame_size.
4017 * This buffer is used to load transmit frames into the adapter's dma transfer
4018 * buffers when there is sufficient space.
4022 * info pointer to device instance data
4024 * Return Value: 0 if success, otherwise -ENOMEM
4026 static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info)
4030 if ( debug_level >= DEBUG_LEVEL_INFO )
4031 printk("%s %s(%d) allocating %d tx holding buffers\n",
4032 info->device_name, __FILE__,__LINE__,info->num_tx_holding_buffers);
4034 memset(info->tx_holding_buffers,0,sizeof(info->tx_holding_buffers));
4036 for ( i=0; i<info->num_tx_holding_buffers; ++i) {
4037 info->tx_holding_buffers[i].buffer =
4038 kmalloc(info->max_frame_size, GFP_KERNEL);
4039 if ( info->tx_holding_buffers[i].buffer == NULL )
4045 } /* end of mgsl_alloc_intermediate_txbuffer_memory() */
4048 * mgsl_free_intermediate_txbuffer_memory()
4053 * info pointer to device instance data
4055 * Return Value: None
4057 static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info)
4061 for ( i=0; i<info->num_tx_holding_buffers; ++i ) {
4062 kfree(info->tx_holding_buffers[i].buffer);
4063 info->tx_holding_buffers[i].buffer = NULL;
4066 info->get_tx_holding_index = 0;
4067 info->put_tx_holding_index = 0;
4068 info->tx_holding_count = 0;
4070 } /* end of mgsl_free_intermediate_txbuffer_memory() */
4074 * load_next_tx_holding_buffer()
4076 * attempts to load the next buffered tx request into the
4081 * info pointer to device instance data
4083 * Return Value: 1 if next buffered tx request loaded
4084 * into adapter's tx dma buffer,
4087 static int load_next_tx_holding_buffer(struct mgsl_struct *info)
4091 if ( info->tx_holding_count ) {
4092 /* determine if we have enough tx dma buffers
4093 * to accommodate the next tx frame
4095 struct tx_holding_buffer *ptx =
4096 &info->tx_holding_buffers[info->get_tx_holding_index];
4097 int num_free = num_free_tx_dma_buffers(info);
4098 int num_needed = ptx->buffer_size / DMABUFFERSIZE;
4099 if ( ptx->buffer_size % DMABUFFERSIZE )
4102 if (num_needed <= num_free) {
4103 info->xmit_cnt = ptx->buffer_size;
4104 mgsl_load_tx_dma_buffer(info,ptx->buffer,ptx->buffer_size);
4106 --info->tx_holding_count;
4107 if ( ++info->get_tx_holding_index >= info->num_tx_holding_buffers)
4108 info->get_tx_holding_index=0;
4110 /* restart transmit timer */
4111 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(5000));
4121 * save_tx_buffer_request()
4123 * attempt to store transmit frame request for later transmission
4127 * info pointer to device instance data
4128 * Buffer pointer to buffer containing frame to load
4129 * BufferSize size in bytes of frame in Buffer
4131 * Return Value: 1 if able to store, 0 otherwise
4133 static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize)
4135 struct tx_holding_buffer *ptx;
4137 if ( info->tx_holding_count >= info->num_tx_holding_buffers ) {
4138 return 0; /* all buffers in use */
4141 ptx = &info->tx_holding_buffers[info->put_tx_holding_index];
4142 ptx->buffer_size = BufferSize;
4143 memcpy( ptx->buffer, Buffer, BufferSize);
4145 ++info->tx_holding_count;
4146 if ( ++info->put_tx_holding_index >= info->num_tx_holding_buffers)
4147 info->put_tx_holding_index=0;
4152 static int mgsl_claim_resources(struct mgsl_struct *info)
4154 if (request_region(info->io_base,info->io_addr_size,"synclink") == NULL) {
4155 printk( "%s(%d):I/O address conflict on device %s Addr=%08X\n",
4156 __FILE__,__LINE__,info->device_name, info->io_base);
4159 info->io_addr_requested = 1;
4161 if ( request_irq(info->irq_level,mgsl_interrupt,info->irq_flags,
4162 info->device_name, info ) < 0 ) {
4163 printk( "%s(%d):Cant request interrupt on device %s IRQ=%d\n",
4164 __FILE__,__LINE__,info->device_name, info->irq_level );
4167 info->irq_requested = 1;
4169 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4170 if (request_mem_region(info->phys_memory_base,0x40000,"synclink") == NULL) {
4171 printk( "%s(%d):mem addr conflict device %s Addr=%08X\n",
4172 __FILE__,__LINE__,info->device_name, info->phys_memory_base);
4175 info->shared_mem_requested = 1;
4176 if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclink") == NULL) {
4177 printk( "%s(%d):lcr mem addr conflict device %s Addr=%08X\n",
4178 __FILE__,__LINE__,info->device_name, info->phys_lcr_base + info->lcr_offset);
4181 info->lcr_mem_requested = 1;
4183 info->memory_base = ioremap(info->phys_memory_base,0x40000);
4184 if (!info->memory_base) {
4185 printk( "%s(%d):Cant map shared memory on device %s MemAddr=%08X\n",
4186 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4190 if ( !mgsl_memory_test(info) ) {
4191 printk( "%s(%d):Failed shared memory test %s MemAddr=%08X\n",
4192 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4196 info->lcr_base = ioremap(info->phys_lcr_base,PAGE_SIZE) + info->lcr_offset;
4197 if (!info->lcr_base) {
4198 printk( "%s(%d):Cant map LCR memory on device %s MemAddr=%08X\n",
4199 __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
4204 /* claim DMA channel */
4206 if (request_dma(info->dma_level,info->device_name) < 0){
4207 printk( "%s(%d):Cant request DMA channel on device %s DMA=%d\n",
4208 __FILE__,__LINE__,info->device_name, info->dma_level );
4209 mgsl_release_resources( info );
4212 info->dma_requested = 1;
4214 /* ISA adapter uses bus master DMA */
4215 set_dma_mode(info->dma_level,DMA_MODE_CASCADE);
4216 enable_dma(info->dma_level);
4219 if ( mgsl_allocate_dma_buffers(info) < 0 ) {
4220 printk( "%s(%d):Cant allocate DMA buffers on device %s DMA=%d\n",
4221 __FILE__,__LINE__,info->device_name, info->dma_level );
4227 mgsl_release_resources(info);
4230 } /* end of mgsl_claim_resources() */
4232 static void mgsl_release_resources(struct mgsl_struct *info)
4234 if ( debug_level >= DEBUG_LEVEL_INFO )
4235 printk( "%s(%d):mgsl_release_resources(%s) entry\n",
4236 __FILE__,__LINE__,info->device_name );
4238 if ( info->irq_requested ) {
4239 free_irq(info->irq_level, info);
4240 info->irq_requested = 0;
4242 if ( info->dma_requested ) {
4243 disable_dma(info->dma_level);
4244 free_dma(info->dma_level);
4245 info->dma_requested = 0;
4247 mgsl_free_dma_buffers(info);
4248 mgsl_free_intermediate_rxbuffer_memory(info);
4249 mgsl_free_intermediate_txbuffer_memory(info);
4251 if ( info->io_addr_requested ) {
4252 release_region(info->io_base,info->io_addr_size);
4253 info->io_addr_requested = 0;
4255 if ( info->shared_mem_requested ) {
4256 release_mem_region(info->phys_memory_base,0x40000);
4257 info->shared_mem_requested = 0;
4259 if ( info->lcr_mem_requested ) {
4260 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
4261 info->lcr_mem_requested = 0;
4263 if (info->memory_base){
4264 iounmap(info->memory_base);
4265 info->memory_base = NULL;
4267 if (info->lcr_base){
4268 iounmap(info->lcr_base - info->lcr_offset);
4269 info->lcr_base = NULL;
4272 if ( debug_level >= DEBUG_LEVEL_INFO )
4273 printk( "%s(%d):mgsl_release_resources(%s) exit\n",
4274 __FILE__,__LINE__,info->device_name );
4276 } /* end of mgsl_release_resources() */
4278 /* mgsl_add_device()
4280 * Add the specified device instance data structure to the
4281 * global linked list of devices and increment the device count.
4283 * Arguments: info pointer to device instance data
4284 * Return Value: None
4286 static void mgsl_add_device( struct mgsl_struct *info )
4288 info->next_device = NULL;
4289 info->line = mgsl_device_count;
4290 sprintf(info->device_name,"ttySL%d",info->line);
4292 if (info->line < MAX_TOTAL_DEVICES) {
4293 if (maxframe[info->line])
4294 info->max_frame_size = maxframe[info->line];
4295 info->dosyncppp = dosyncppp[info->line];
4297 if (txdmabufs[info->line]) {
4298 info->num_tx_dma_buffers = txdmabufs[info->line];
4299 if (info->num_tx_dma_buffers < 1)
4300 info->num_tx_dma_buffers = 1;
4303 if (txholdbufs[info->line]) {
4304 info->num_tx_holding_buffers = txholdbufs[info->line];
4305 if (info->num_tx_holding_buffers < 1)
4306 info->num_tx_holding_buffers = 1;
4307 else if (info->num_tx_holding_buffers > MAX_TX_HOLDING_BUFFERS)
4308 info->num_tx_holding_buffers = MAX_TX_HOLDING_BUFFERS;
4312 mgsl_device_count++;
4314 if ( !mgsl_device_list )
4315 mgsl_device_list = info;
4317 struct mgsl_struct *current_dev = mgsl_device_list;
4318 while( current_dev->next_device )
4319 current_dev = current_dev->next_device;
4320 current_dev->next_device = info;
4323 if ( info->max_frame_size < 4096 )
4324 info->max_frame_size = 4096;
4325 else if ( info->max_frame_size > 65535 )
4326 info->max_frame_size = 65535;
4328 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4329 printk( "SyncLink PCI v%d %s: IO=%04X IRQ=%d Mem=%08X,%08X MaxFrameSize=%u\n",
4330 info->hw_version + 1, info->device_name, info->io_base, info->irq_level,
4331 info->phys_memory_base, info->phys_lcr_base,
4332 info->max_frame_size );
4334 printk( "SyncLink ISA %s: IO=%04X IRQ=%d DMA=%d MaxFrameSize=%u\n",
4335 info->device_name, info->io_base, info->irq_level, info->dma_level,
4336 info->max_frame_size );
4343 } /* end of mgsl_add_device() */
4345 /* mgsl_allocate_device()
4347 * Allocate and initialize a device instance structure
4350 * Return Value: pointer to mgsl_struct if success, otherwise NULL
4352 static struct mgsl_struct* mgsl_allocate_device(void)
4354 struct mgsl_struct *info;
4356 info = (struct mgsl_struct *)kmalloc(sizeof(struct mgsl_struct),
4360 printk("Error can't allocate device instance data\n");
4362 memset(info, 0, sizeof(struct mgsl_struct));
4363 info->magic = MGSL_MAGIC;
4364 INIT_WORK(&info->task, mgsl_bh_handler, info);
4365 info->max_frame_size = 4096;
4366 info->close_delay = 5*HZ/10;
4367 info->closing_wait = 30*HZ;
4368 init_waitqueue_head(&info->open_wait);
4369 init_waitqueue_head(&info->close_wait);
4370 init_waitqueue_head(&info->status_event_wait_q);
4371 init_waitqueue_head(&info->event_wait_q);
4372 spin_lock_init(&info->irq_spinlock);
4373 spin_lock_init(&info->netlock);
4374 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
4375 info->idle_mode = HDLC_TXIDLE_FLAGS;
4376 info->num_tx_dma_buffers = 1;
4377 info->num_tx_holding_buffers = 0;
4382 } /* end of mgsl_allocate_device()*/
4384 static struct tty_operations mgsl_ops = {
4386 .close = mgsl_close,
4387 .write = mgsl_write,
4388 .put_char = mgsl_put_char,
4389 .flush_chars = mgsl_flush_chars,
4390 .write_room = mgsl_write_room,
4391 .chars_in_buffer = mgsl_chars_in_buffer,
4392 .flush_buffer = mgsl_flush_buffer,
4393 .ioctl = mgsl_ioctl,
4394 .throttle = mgsl_throttle,
4395 .unthrottle = mgsl_unthrottle,
4396 .send_xchar = mgsl_send_xchar,
4397 .break_ctl = mgsl_break,
4398 .wait_until_sent = mgsl_wait_until_sent,
4399 .read_proc = mgsl_read_proc,
4400 .set_termios = mgsl_set_termios,
4402 .start = mgsl_start,
4403 .hangup = mgsl_hangup,
4404 .tiocmget = tiocmget,
4405 .tiocmset = tiocmset,
4409 * perform tty device initialization
4411 static int mgsl_init_tty(void)
4415 serial_driver = alloc_tty_driver(128);
4419 serial_driver->owner = THIS_MODULE;
4420 serial_driver->driver_name = "synclink";
4421 serial_driver->name = "ttySL";
4422 serial_driver->major = ttymajor;
4423 serial_driver->minor_start = 64;
4424 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4425 serial_driver->subtype = SERIAL_TYPE_NORMAL;
4426 serial_driver->init_termios = tty_std_termios;
4427 serial_driver->init_termios.c_cflag =
4428 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4429 serial_driver->flags = TTY_DRIVER_REAL_RAW;
4430 tty_set_operations(serial_driver, &mgsl_ops);
4431 if ((rc = tty_register_driver(serial_driver)) < 0) {
4432 printk("%s(%d):Couldn't register serial driver\n",
4434 put_tty_driver(serial_driver);
4435 serial_driver = NULL;
4439 printk("%s %s, tty major#%d\n",
4440 driver_name, driver_version,
4441 serial_driver->major);
4445 /* enumerate user specified ISA adapters
4447 static void mgsl_enum_isa_devices(void)
4449 struct mgsl_struct *info;
4452 /* Check for user specified ISA devices */
4454 for (i=0 ;(i < MAX_ISA_DEVICES) && io[i] && irq[i]; i++){
4455 if ( debug_level >= DEBUG_LEVEL_INFO )
4456 printk("ISA device specified io=%04X,irq=%d,dma=%d\n",
4457 io[i], irq[i], dma[i] );
4459 info = mgsl_allocate_device();
4461 /* error allocating device instance data */
4462 if ( debug_level >= DEBUG_LEVEL_ERROR )
4463 printk( "can't allocate device instance data.\n");
4467 /* Copy user configuration info to device instance data */
4468 info->io_base = (unsigned int)io[i];
4469 info->irq_level = (unsigned int)irq[i];
4470 info->irq_level = irq_canonicalize(info->irq_level);
4471 info->dma_level = (unsigned int)dma[i];
4472 info->bus_type = MGSL_BUS_TYPE_ISA;
4473 info->io_addr_size = 16;
4474 info->irq_flags = 0;
4476 mgsl_add_device( info );
4480 static void synclink_cleanup(void)
4483 struct mgsl_struct *info;
4484 struct mgsl_struct *tmp;
4486 printk("Unloading %s: %s\n", driver_name, driver_version);
4488 if (serial_driver) {
4489 if ((rc = tty_unregister_driver(serial_driver)))
4490 printk("%s(%d) failed to unregister tty driver err=%d\n",
4491 __FILE__,__LINE__,rc);
4492 put_tty_driver(serial_driver);
4495 info = mgsl_device_list;
4500 mgsl_release_resources(info);
4502 info = info->next_device;
4507 free_page((unsigned long) tmp_buf);
4512 pci_unregister_driver(&synclink_pci_driver);
4515 static int __init synclink_init(void)
4519 if (break_on_load) {
4520 mgsl_get_text_ptr();
4524 printk("%s %s\n", driver_name, driver_version);
4526 mgsl_enum_isa_devices();
4527 if ((rc = pci_register_driver(&synclink_pci_driver)) < 0)
4528 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
4532 if ((rc = mgsl_init_tty()) < 0)
4542 static void __exit synclink_exit(void)
4547 module_init(synclink_init);
4548 module_exit(synclink_exit);
4553 * Issue a USC Receive/Transmit command to the
4554 * Channel Command/Address Register (CCAR).
4558 * The command is encoded in the most significant 5 bits <15..11>
4559 * of the CCAR value. Bits <10..7> of the CCAR must be preserved
4560 * and Bits <6..0> must be written as zeros.
4564 * info pointer to device information structure
4565 * Cmd command mask (use symbolic macros)
4571 static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd )
4573 /* output command to CCAR in bits <15..11> */
4574 /* preserve bits <10..7>, bits <6..0> must be zero */
4576 outw( Cmd + info->loopback_bits, info->io_base + CCAR );
4578 /* Read to flush write to CCAR */
4579 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4580 inw( info->io_base + CCAR );
4582 } /* end of usc_RTCmd() */
4587 * Issue a DMA command to the DMA Command/Address Register (DCAR).
4591 * info pointer to device information structure
4592 * Cmd DMA command mask (usc_DmaCmd_XX Macros)
4598 static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd )
4600 /* write command mask to DCAR */
4601 outw( Cmd + info->mbre_bit, info->io_base );
4603 /* Read to flush write to DCAR */
4604 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4605 inw( info->io_base );
4607 } /* end of usc_DmaCmd() */
4612 * Write a 16-bit value to a USC DMA register
4616 * info pointer to device info structure
4617 * RegAddr register address (number) for write
4618 * RegValue 16-bit value to write to register
4625 static void usc_OutDmaReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4627 /* Note: The DCAR is located at the adapter base address */
4628 /* Note: must preserve state of BIT8 in DCAR */
4630 outw( RegAddr + info->mbre_bit, info->io_base );
4631 outw( RegValue, info->io_base );
4633 /* Read to flush write to DCAR */
4634 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4635 inw( info->io_base );
4637 } /* end of usc_OutDmaReg() */
4642 * Read a 16-bit value from a DMA register
4646 * info pointer to device info structure
4647 * RegAddr register address (number) to read from
4651 * The 16-bit value read from register
4654 static u16 usc_InDmaReg( struct mgsl_struct *info, u16 RegAddr )
4656 /* Note: The DCAR is located at the adapter base address */
4657 /* Note: must preserve state of BIT8 in DCAR */
4659 outw( RegAddr + info->mbre_bit, info->io_base );
4660 return inw( info->io_base );
4662 } /* end of usc_InDmaReg() */
4668 * Write a 16-bit value to a USC serial channel register
4672 * info pointer to device info structure
4673 * RegAddr register address (number) to write to
4674 * RegValue 16-bit value to write to register
4681 static void usc_OutReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4683 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4684 outw( RegValue, info->io_base + CCAR );
4686 /* Read to flush write to CCAR */
4687 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4688 inw( info->io_base + CCAR );
4690 } /* end of usc_OutReg() */
4695 * Reads a 16-bit value from a USC serial channel register
4699 * info pointer to device extension
4700 * RegAddr register address (number) to read from
4704 * 16-bit value read from register
4706 static u16 usc_InReg( struct mgsl_struct *info, u16 RegAddr )
4708 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4709 return inw( info->io_base + CCAR );
4711 } /* end of usc_InReg() */
4713 /* usc_set_sdlc_mode()
4715 * Set up the adapter for SDLC DMA communications.
4717 * Arguments: info pointer to device instance data
4718 * Return Value: NONE
4720 static void usc_set_sdlc_mode( struct mgsl_struct *info )
4726 * determine if the IUSC on the adapter is pre-SL1660. If
4727 * not, take advantage of the UnderWait feature of more
4728 * modern chips. If an underrun occurs and this bit is set,
4729 * the transmitter will idle the programmed idle pattern
4730 * until the driver has time to service the underrun. Otherwise,
4731 * the dma controller may get the cycles previously requested
4732 * and begin transmitting queued tx data.
4734 usc_OutReg(info,TMCR,0x1f);
4735 RegValue=usc_InReg(info,TMDR);
4736 if ( RegValue == IUSC_PRE_SL1660 )
4742 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
4745 ** Channel Mode Register (CMR)
4747 ** <15..14> 10 Tx Sub Modes, Send Flag on Underrun
4748 ** <13> 0 0 = Transmit Disabled (initially)
4749 ** <12> 0 1 = Consecutive Idles share common 0
4750 ** <11..8> 1110 Transmitter Mode = HDLC/SDLC Loop
4751 ** <7..4> 0000 Rx Sub Modes, addr/ctrl field handling
4752 ** <3..0> 0110 Receiver Mode = HDLC/SDLC
4754 ** 1000 1110 0000 0110 = 0x8e06
4758 /*--------------------------------------------------
4759 * ignore user options for UnderRun Actions and
4761 *--------------------------------------------------*/
4765 /* Channel mode Register (CMR)
4767 * <15..14> 00 Tx Sub modes, Underrun Action
4768 * <13> 0 1 = Send Preamble before opening flag
4769 * <12> 0 1 = Consecutive Idles share common 0
4770 * <11..8> 0110 Transmitter mode = HDLC/SDLC
4771 * <7..4> 0000 Rx Sub modes, addr/ctrl field handling
4772 * <3..0> 0110 Receiver mode = HDLC/SDLC
4774 * 0000 0110 0000 0110 = 0x0606
4776 if (info->params.mode == MGSL_MODE_RAW) {
4777 RegValue = 0x0001; /* Set Receive mode = external sync */
4779 usc_OutReg( info, IOCR, /* Set IOCR DCD is RxSync Detect Input */
4780 (unsigned short)((usc_InReg(info, IOCR) & ~(BIT13|BIT12)) | BIT12));
4784 * CMR <15> 0 Don't send CRC on Tx Underrun
4785 * CMR <14> x undefined
4786 * CMR <13> 0 Send preamble before openning sync
4787 * CMR <12> 0 Send 8-bit syncs, 1=send Syncs per TxLength
4790 * CMR <11-8) 0100 MonoSync
4792 * 0x00 0100 xxxx xxxx 04xx
4800 if ( info->params.flags & HDLC_FLAG_UNDERRUN_ABORT15 )
4802 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_FLAG )
4804 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_CRC )
4805 RegValue |= BIT15 + BIT14;
4808 if ( info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE )
4812 if ( info->params.mode == MGSL_MODE_HDLC &&
4813 (info->params.flags & HDLC_FLAG_SHARE_ZERO) )
4816 if ( info->params.addr_filter != 0xff )
4818 /* set up receive address filtering */
4819 usc_OutReg( info, RSR, info->params.addr_filter );
4823 usc_OutReg( info, CMR, RegValue );
4824 info->cmr_value = RegValue;
4826 /* Receiver mode Register (RMR)
4828 * <15..13> 000 encoding
4829 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4830 * <10> 1 1 = Set CRC to all 1s (use for SDLC/HDLC)
4831 * <9> 0 1 = Include Receive chars in CRC
4832 * <8> 1 1 = Use Abort/PE bit as abort indicator
4833 * <7..6> 00 Even parity
4834 * <5> 0 parity disabled
4835 * <4..2> 000 Receive Char Length = 8 bits
4836 * <1..0> 00 Disable Receiver
4838 * 0000 0101 0000 0000 = 0x0500
4843 switch ( info->params.encoding ) {
4844 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4845 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4846 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4847 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4848 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4849 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4850 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4853 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4855 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4856 RegValue |= ( BIT12 | BIT10 | BIT9 );
4858 usc_OutReg( info, RMR, RegValue );
4860 /* Set the Receive count Limit Register (RCLR) to 0xffff. */
4861 /* When an opening flag of an SDLC frame is recognized the */
4862 /* Receive Character count (RCC) is loaded with the value in */
4863 /* RCLR. The RCC is decremented for each received byte. The */
4864 /* value of RCC is stored after the closing flag of the frame */
4865 /* allowing the frame size to be computed. */
4867 usc_OutReg( info, RCLR, RCLRVALUE );
4869 usc_RCmd( info, RCmd_SelectRicrdma_level );
4871 /* Receive Interrupt Control Register (RICR)
4873 * <15..8> ? RxFIFO DMA Request Level
4874 * <7> 0 Exited Hunt IA (Interrupt Arm)
4875 * <6> 0 Idle Received IA
4876 * <5> 0 Break/Abort IA
4878 * <3> 1 Queued status reflects oldest 2 bytes in FIFO
4880 * <1> 1 Rx Overrun IA
4881 * <0> 0 Select TC0 value for readback
4883 * 0000 0000 0000 1000 = 0x000a
4886 /* Carry over the Exit Hunt and Idle Received bits */
4887 /* in case they have been armed by usc_ArmEvents. */
4889 RegValue = usc_InReg( info, RICR ) & 0xc0;
4891 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4892 usc_OutReg( info, RICR, (u16)(0x030a | RegValue) );
4894 usc_OutReg( info, RICR, (u16)(0x140a | RegValue) );
4896 /* Unlatch all Rx status bits and clear Rx status IRQ Pending */
4898 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
4899 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
4901 /* Transmit mode Register (TMR)
4903 * <15..13> 000 encoding
4904 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4905 * <10> 1 1 = Start CRC as all 1s (use for SDLC/HDLC)
4906 * <9> 0 1 = Tx CRC Enabled
4907 * <8> 0 1 = Append CRC to end of transmit frame
4908 * <7..6> 00 Transmit parity Even
4909 * <5> 0 Transmit parity Disabled
4910 * <4..2> 000 Tx Char Length = 8 bits
4911 * <1..0> 00 Disable Transmitter
4913 * 0000 0100 0000 0000 = 0x0400
4918 switch ( info->params.encoding ) {
4919 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4920 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4921 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4922 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4923 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4924 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4925 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4928 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4929 RegValue |= BIT9 + BIT8;
4930 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4931 RegValue |= ( BIT12 | BIT10 | BIT9 | BIT8);
4933 usc_OutReg( info, TMR, RegValue );
4935 usc_set_txidle( info );
4938 usc_TCmd( info, TCmd_SelectTicrdma_level );
4940 /* Transmit Interrupt Control Register (TICR)
4942 * <15..8> ? Transmit FIFO DMA Level
4943 * <7> 0 Present IA (Interrupt Arm)
4944 * <6> 0 Idle Sent IA
4945 * <5> 1 Abort Sent IA
4946 * <4> 1 EOF/EOM Sent IA
4948 * <2> 1 1 = Wait for SW Trigger to Start Frame
4949 * <1> 1 Tx Underrun IA
4950 * <0> 0 TC0 constant on read back
4952 * 0000 0000 0011 0110 = 0x0036
4955 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4956 usc_OutReg( info, TICR, 0x0736 );
4958 usc_OutReg( info, TICR, 0x1436 );
4960 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
4961 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
4964 ** Transmit Command/Status Register (TCSR)
4966 ** <15..12> 0000 TCmd
4967 ** <11> 0/1 UnderWait
4968 ** <10..08> 000 TxIdle
4972 ** <4> x EOF/EOM Sent
4978 ** 0000 0000 0000 0000 = 0x0000
4980 info->tcsr_value = 0;
4983 info->tcsr_value |= TCSR_UNDERWAIT;
4985 usc_OutReg( info, TCSR, info->tcsr_value );
4987 /* Clock mode Control Register (CMCR)
4989 * <15..14> 00 counter 1 Source = Disabled
4990 * <13..12> 00 counter 0 Source = Disabled
4991 * <11..10> 11 BRG1 Input is TxC Pin
4992 * <9..8> 11 BRG0 Input is TxC Pin
4993 * <7..6> 01 DPLL Input is BRG1 Output
4994 * <5..3> XXX TxCLK comes from Port 0
4995 * <2..0> XXX RxCLK comes from Port 1
4997 * 0000 1111 0111 0111 = 0x0f77
5002 if ( info->params.flags & HDLC_FLAG_RXC_DPLL )
5003 RegValue |= 0x0003; /* RxCLK from DPLL */
5004 else if ( info->params.flags & HDLC_FLAG_RXC_BRG )
5005 RegValue |= 0x0004; /* RxCLK from BRG0 */
5006 else if ( info->params.flags & HDLC_FLAG_RXC_TXCPIN)
5007 RegValue |= 0x0006; /* RxCLK from TXC Input */
5009 RegValue |= 0x0007; /* RxCLK from Port1 */
5011 if ( info->params.flags & HDLC_FLAG_TXC_DPLL )
5012 RegValue |= 0x0018; /* TxCLK from DPLL */
5013 else if ( info->params.flags & HDLC_FLAG_TXC_BRG )
5014 RegValue |= 0x0020; /* TxCLK from BRG0 */
5015 else if ( info->params.flags & HDLC_FLAG_TXC_RXCPIN)
5016 RegValue |= 0x0038; /* RxCLK from TXC Input */
5018 RegValue |= 0x0030; /* TxCLK from Port0 */
5020 usc_OutReg( info, CMCR, RegValue );
5023 /* Hardware Configuration Register (HCR)
5025 * <15..14> 00 CTR0 Divisor:00=32,01=16,10=8,11=4
5026 * <13> 0 CTR1DSel:0=CTR0Div determines CTR0Div
5027 * <12> 0 CVOK:0=report code violation in biphase
5028 * <11..10> 00 DPLL Divisor:00=32,01=16,10=8,11=4
5029 * <9..8> XX DPLL mode:00=disable,01=NRZ,10=Biphase,11=Biphase Level
5030 * <7..6> 00 reserved
5031 * <5> 0 BRG1 mode:0=continuous,1=single cycle
5033 * <3..2> 00 reserved
5034 * <1> 0 BRG0 mode:0=continuous,1=single cycle
5040 if ( info->params.flags & (HDLC_FLAG_RXC_DPLL + HDLC_FLAG_TXC_DPLL) ) {
5045 /* DPLL is enabled. Use BRG1 to provide continuous reference clock */
5046 /* for DPLL. DPLL mode in HCR is dependent on the encoding used. */
5048 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
5049 XtalSpeed = 11059200;
5051 XtalSpeed = 14745600;
5053 if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
5057 else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
5064 /* Tc = (Xtal/Speed) - 1 */
5065 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
5066 /* then rounding up gives a more precise time constant. Instead */
5067 /* of rounding up and then subtracting 1 we just don't subtract */
5068 /* the one in this case. */
5070 /*--------------------------------------------------
5071 * ejz: for DPLL mode, application should use the
5072 * same clock speed as the partner system, even
5073 * though clocking is derived from the input RxData.
5074 * In case the user uses a 0 for the clock speed,
5075 * default to 0xffffffff and don't try to divide by
5077 *--------------------------------------------------*/
5078 if ( info->params.clock_speed )
5080 Tc = (u16)((XtalSpeed/DpllDivisor)/info->params.clock_speed);
5081 if ( !((((XtalSpeed/DpllDivisor) % info->params.clock_speed) * 2)
5082 / info->params.clock_speed) )
5089 /* Write 16-bit Time Constant for BRG1 */
5090 usc_OutReg( info, TC1R, Tc );
5092 RegValue |= BIT4; /* enable BRG1 */
5094 switch ( info->params.encoding ) {
5095 case HDLC_ENCODING_NRZ:
5096 case HDLC_ENCODING_NRZB:
5097 case HDLC_ENCODING_NRZI_MARK:
5098 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT8; break;
5099 case HDLC_ENCODING_BIPHASE_MARK:
5100 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT9; break;
5101 case HDLC_ENCODING_BIPHASE_LEVEL:
5102 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT9 + BIT8; break;
5106 usc_OutReg( info, HCR, RegValue );
5109 /* Channel Control/status Register (CCSR)
5111 * <15> X RCC FIFO Overflow status (RO)
5112 * <14> X RCC FIFO Not Empty status (RO)
5113 * <13> 0 1 = Clear RCC FIFO (WO)
5114 * <12> X DPLL Sync (RW)
5115 * <11> X DPLL 2 Missed Clocks status (RO)
5116 * <10> X DPLL 1 Missed Clock status (RO)
5117 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
5118 * <7> X SDLC Loop On status (RO)
5119 * <6> X SDLC Loop Send status (RO)
5120 * <5> 1 Bypass counters for TxClk and RxClk (RW)
5121 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
5122 * <1..0> 00 reserved
5124 * 0000 0000 0010 0000 = 0x0020
5127 usc_OutReg( info, CCSR, 0x1020 );
5130 if ( info->params.flags & HDLC_FLAG_AUTO_CTS ) {
5131 usc_OutReg( info, SICR,
5132 (u16)(usc_InReg(info,SICR) | SICR_CTS_INACTIVE) );
5136 /* enable Master Interrupt Enable bit (MIE) */
5137 usc_EnableMasterIrqBit( info );
5139 usc_ClearIrqPendingBits( info, RECEIVE_STATUS + RECEIVE_DATA +
5140 TRANSMIT_STATUS + TRANSMIT_DATA + MISC);
5142 /* arm RCC underflow interrupt */
5143 usc_OutReg(info, SICR, (u16)(usc_InReg(info,SICR) | BIT3));
5144 usc_EnableInterrupts(info, MISC);
5147 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5148 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5149 info->mbre_bit = BIT8;
5150 outw( BIT8, info->io_base ); /* set Master Bus Enable (DCAR) */
5152 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
5153 /* Enable DMAEN (Port 7, Bit 14) */
5154 /* This connects the DMA request signal to the ISA bus */
5155 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) & ~BIT14));
5158 /* DMA Control Register (DCR)
5160 * <15..14> 10 Priority mode = Alternating Tx/Rx
5161 * 01 Rx has priority
5162 * 00 Tx has priority
5164 * <13> 1 Enable Priority Preempt per DCR<15..14>
5165 * (WARNING DCR<11..10> must be 00 when this is 1)
5166 * 0 Choose activate channel per DCR<11..10>
5168 * <12> 0 Little Endian for Array/List
5169 * <11..10> 00 Both Channels can use each bus grant
5170 * <9..6> 0000 reserved
5171 * <5> 0 7 CLK - Minimum Bus Re-request Interval
5172 * <4> 0 1 = drive D/C and S/D pins
5173 * <3> 1 1 = Add one wait state to all DMA cycles.
5174 * <2> 0 1 = Strobe /UAS on every transfer.
5175 * <1..0> 11 Addr incrementing only affects LS24 bits
5177 * 0110 0000 0000 1011 = 0x600b
5180 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5181 /* PCI adapter does not need DMA wait state */
5182 usc_OutDmaReg( info, DCR, 0xa00b );
5185 usc_OutDmaReg( info, DCR, 0x800b );
5188 /* Receive DMA mode Register (RDMR)
5190 * <15..14> 11 DMA mode = Linked List Buffer mode
5191 * <13> 1 RSBinA/L = store Rx status Block in Arrary/List entry
5192 * <12> 1 Clear count of List Entry after fetching
5193 * <11..10> 00 Address mode = Increment
5194 * <9> 1 Terminate Buffer on RxBound
5195 * <8> 0 Bus Width = 16bits
5196 * <7..0> ? status Bits (write as 0s)
5198 * 1111 0010 0000 0000 = 0xf200
5201 usc_OutDmaReg( info, RDMR, 0xf200 );
5204 /* Transmit DMA mode Register (TDMR)
5206 * <15..14> 11 DMA mode = Linked List Buffer mode
5207 * <13> 1 TCBinA/L = fetch Tx Control Block from List entry
5208 * <12> 1 Clear count of List Entry after fetching
5209 * <11..10> 00 Address mode = Increment
5210 * <9> 1 Terminate Buffer on end of frame
5211 * <8> 0 Bus Width = 16bits
5212 * <7..0> ? status Bits (Read Only so write as 0)
5214 * 1111 0010 0000 0000 = 0xf200
5217 usc_OutDmaReg( info, TDMR, 0xf200 );
5220 /* DMA Interrupt Control Register (DICR)
5222 * <15> 1 DMA Interrupt Enable
5223 * <14> 0 1 = Disable IEO from USC
5224 * <13> 0 1 = Don't provide vector during IntAck
5225 * <12> 1 1 = Include status in Vector
5226 * <10..2> 0 reserved, Must be 0s
5227 * <1> 0 1 = Rx DMA Interrupt Enabled
5228 * <0> 0 1 = Tx DMA Interrupt Enabled
5230 * 1001 0000 0000 0000 = 0x9000
5233 usc_OutDmaReg( info, DICR, 0x9000 );
5235 usc_InDmaReg( info, RDMR ); /* clear pending receive DMA IRQ bits */
5236 usc_InDmaReg( info, TDMR ); /* clear pending transmit DMA IRQ bits */
5237 usc_OutDmaReg( info, CDIR, 0x0303 ); /* clear IUS and Pending for Tx and Rx */
5239 /* Channel Control Register (CCR)
5241 * <15..14> 10 Use 32-bit Tx Control Blocks (TCBs)
5242 * <13> 0 Trigger Tx on SW Command Disabled
5243 * <12> 0 Flag Preamble Disabled
5244 * <11..10> 00 Preamble Length
5245 * <9..8> 00 Preamble Pattern
5246 * <7..6> 10 Use 32-bit Rx status Blocks (RSBs)
5247 * <5> 0 Trigger Rx on SW Command Disabled
5250 * 1000 0000 1000 0000 = 0x8080
5255 switch ( info->params.preamble_length ) {
5256 case HDLC_PREAMBLE_LENGTH_16BITS: RegValue |= BIT10; break;
5257 case HDLC_PREAMBLE_LENGTH_32BITS: RegValue |= BIT11; break;
5258 case HDLC_PREAMBLE_LENGTH_64BITS: RegValue |= BIT11 + BIT10; break;
5261 switch ( info->params.preamble ) {
5262 case HDLC_PREAMBLE_PATTERN_FLAGS: RegValue |= BIT8 + BIT12; break;
5263 case HDLC_PREAMBLE_PATTERN_ONES: RegValue |= BIT8; break;
5264 case HDLC_PREAMBLE_PATTERN_10: RegValue |= BIT9; break;
5265 case HDLC_PREAMBLE_PATTERN_01: RegValue |= BIT9 + BIT8; break;
5268 usc_OutReg( info, CCR, RegValue );
5272 * Burst/Dwell Control Register
5274 * <15..8> 0x20 Maximum number of transfers per bus grant
5275 * <7..0> 0x00 Maximum number of clock cycles per bus grant
5278 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5279 /* don't limit bus occupancy on PCI adapter */
5280 usc_OutDmaReg( info, BDCR, 0x0000 );
5283 usc_OutDmaReg( info, BDCR, 0x2000 );
5285 usc_stop_transmitter(info);
5286 usc_stop_receiver(info);
5288 } /* end of usc_set_sdlc_mode() */
5290 /* usc_enable_loopback()
5292 * Set the 16C32 for internal loopback mode.
5293 * The TxCLK and RxCLK signals are generated from the BRG0 and
5294 * the TxD is looped back to the RxD internally.
5296 * Arguments: info pointer to device instance data
5297 * enable 1 = enable loopback, 0 = disable
5298 * Return Value: None
5300 static void usc_enable_loopback(struct mgsl_struct *info, int enable)
5303 /* blank external TXD output */
5304 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) | (BIT7+BIT6));
5306 /* Clock mode Control Register (CMCR)
5308 * <15..14> 00 counter 1 Disabled
5309 * <13..12> 00 counter 0 Disabled
5310 * <11..10> 11 BRG1 Input is TxC Pin
5311 * <9..8> 11 BRG0 Input is TxC Pin
5312 * <7..6> 01 DPLL Input is BRG1 Output
5313 * <5..3> 100 TxCLK comes from BRG0
5314 * <2..0> 100 RxCLK comes from BRG0
5316 * 0000 1111 0110 0100 = 0x0f64
5319 usc_OutReg( info, CMCR, 0x0f64 );
5321 /* Write 16-bit Time Constant for BRG0 */
5322 /* use clock speed if available, otherwise use 8 for diagnostics */
5323 if (info->params.clock_speed) {
5324 if (info->bus_type == MGSL_BUS_TYPE_PCI)
5325 usc_OutReg(info, TC0R, (u16)((11059200/info->params.clock_speed)-1));
5327 usc_OutReg(info, TC0R, (u16)((14745600/info->params.clock_speed)-1));
5329 usc_OutReg(info, TC0R, (u16)8);
5331 /* Hardware Configuration Register (HCR) Clear Bit 1, BRG0
5332 mode = Continuous Set Bit 0 to enable BRG0. */
5333 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5335 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5336 usc_OutReg(info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004));
5338 /* set Internal Data loopback mode */
5339 info->loopback_bits = 0x300;
5340 outw( 0x0300, info->io_base + CCAR );
5342 /* enable external TXD output */
5343 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) & ~(BIT7+BIT6));
5345 /* clear Internal Data loopback mode */
5346 info->loopback_bits = 0;
5347 outw( 0,info->io_base + CCAR );
5350 } /* end of usc_enable_loopback() */
5352 /* usc_enable_aux_clock()
5354 * Enabled the AUX clock output at the specified frequency.
5358 * info pointer to device extension
5359 * data_rate data rate of clock in bits per second
5360 * A data rate of 0 disables the AUX clock.
5362 * Return Value: None
5364 static void usc_enable_aux_clock( struct mgsl_struct *info, u32 data_rate )
5370 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
5371 XtalSpeed = 11059200;
5373 XtalSpeed = 14745600;
5376 /* Tc = (Xtal/Speed) - 1 */
5377 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
5378 /* then rounding up gives a more precise time constant. Instead */
5379 /* of rounding up and then subtracting 1 we just don't subtract */
5380 /* the one in this case. */
5383 Tc = (u16)(XtalSpeed/data_rate);
5384 if ( !(((XtalSpeed % data_rate) * 2) / data_rate) )
5387 /* Write 16-bit Time Constant for BRG0 */
5388 usc_OutReg( info, TC0R, Tc );
5391 * Hardware Configuration Register (HCR)
5392 * Clear Bit 1, BRG0 mode = Continuous
5393 * Set Bit 0 to enable BRG0.
5396 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5398 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5399 usc_OutReg( info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
5401 /* data rate == 0 so turn off BRG0 */
5402 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
5405 } /* end of usc_enable_aux_clock() */
5409 * usc_process_rxoverrun_sync()
5411 * This function processes a receive overrun by resetting the
5412 * receive DMA buffers and issuing a Purge Rx FIFO command
5413 * to allow the receiver to continue receiving.
5417 * info pointer to device extension
5419 * Return Value: None
5421 static void usc_process_rxoverrun_sync( struct mgsl_struct *info )
5425 int frame_start_index;
5426 int start_of_frame_found = FALSE;
5427 int end_of_frame_found = FALSE;
5428 int reprogram_dma = FALSE;
5430 DMABUFFERENTRY *buffer_list = info->rx_buffer_list;
5433 usc_DmaCmd( info, DmaCmd_PauseRxChannel );
5434 usc_RCmd( info, RCmd_EnterHuntmode );
5435 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5437 /* CurrentRxBuffer points to the 1st buffer of the next */
5438 /* possibly available receive frame. */
5440 frame_start_index = start_index = end_index = info->current_rx_buffer;
5442 /* Search for an unfinished string of buffers. This means */
5443 /* that a receive frame started (at least one buffer with */
5444 /* count set to zero) but there is no terminiting buffer */
5445 /* (status set to non-zero). */
5447 while( !buffer_list[end_index].count )
5449 /* Count field has been reset to zero by 16C32. */
5450 /* This buffer is currently in use. */
5452 if ( !start_of_frame_found )
5454 start_of_frame_found = TRUE;
5455 frame_start_index = end_index;
5456 end_of_frame_found = FALSE;
5459 if ( buffer_list[end_index].status )
5461 /* Status field has been set by 16C32. */
5462 /* This is the last buffer of a received frame. */
5464 /* We want to leave the buffers for this frame intact. */
5465 /* Move on to next possible frame. */
5467 start_of_frame_found = FALSE;
5468 end_of_frame_found = TRUE;
5471 /* advance to next buffer entry in linked list */
5473 if ( end_index == info->rx_buffer_count )
5476 if ( start_index == end_index )
5478 /* The entire list has been searched with all Counts == 0 and */
5479 /* all Status == 0. The receive buffers are */
5480 /* completely screwed, reset all receive buffers! */
5481 mgsl_reset_rx_dma_buffers( info );
5482 frame_start_index = 0;
5483 start_of_frame_found = FALSE;
5484 reprogram_dma = TRUE;
5489 if ( start_of_frame_found && !end_of_frame_found )
5491 /* There is an unfinished string of receive DMA buffers */
5492 /* as a result of the receiver overrun. */
5494 /* Reset the buffers for the unfinished frame */
5495 /* and reprogram the receive DMA controller to start */
5496 /* at the 1st buffer of unfinished frame. */
5498 start_index = frame_start_index;
5502 *((unsigned long *)&(info->rx_buffer_list[start_index++].count)) = DMABUFFERSIZE;
5504 /* Adjust index for wrap around. */
5505 if ( start_index == info->rx_buffer_count )
5508 } while( start_index != end_index );
5510 reprogram_dma = TRUE;
5513 if ( reprogram_dma )
5515 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
5516 usc_ClearIrqPendingBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5517 usc_UnlatchRxstatusBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5519 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5521 /* This empties the receive FIFO and loads the RCC with RCLR */
5522 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5524 /* program 16C32 with physical address of 1st DMA buffer entry */
5525 phys_addr = info->rx_buffer_list[frame_start_index].phys_entry;
5526 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5527 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5529 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5530 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5531 usc_EnableInterrupts( info, RECEIVE_STATUS );
5533 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5534 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5536 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5537 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5538 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5539 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5540 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5542 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5546 /* This empties the receive FIFO and loads the RCC with RCLR */
5547 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5548 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5551 } /* end of usc_process_rxoverrun_sync() */
5553 /* usc_stop_receiver()
5555 * Disable USC receiver
5557 * Arguments: info pointer to device instance data
5558 * Return Value: None
5560 static void usc_stop_receiver( struct mgsl_struct *info )
5562 if (debug_level >= DEBUG_LEVEL_ISR)
5563 printk("%s(%d):usc_stop_receiver(%s)\n",
5564 __FILE__,__LINE__, info->device_name );
5566 /* Disable receive DMA channel. */
5567 /* This also disables receive DMA channel interrupts */
5568 usc_DmaCmd( info, DmaCmd_ResetRxChannel );
5570 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5571 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5572 usc_DisableInterrupts( info, RECEIVE_DATA + RECEIVE_STATUS );
5574 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5576 /* This empties the receive FIFO and loads the RCC with RCLR */
5577 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5578 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5580 info->rx_enabled = 0;
5581 info->rx_overflow = 0;
5582 info->rx_rcc_underrun = 0;
5584 } /* end of stop_receiver() */
5586 /* usc_start_receiver()
5588 * Enable the USC receiver
5590 * Arguments: info pointer to device instance data
5591 * Return Value: None
5593 static void usc_start_receiver( struct mgsl_struct *info )
5597 if (debug_level >= DEBUG_LEVEL_ISR)
5598 printk("%s(%d):usc_start_receiver(%s)\n",
5599 __FILE__,__LINE__, info->device_name );
5601 mgsl_reset_rx_dma_buffers( info );
5602 usc_stop_receiver( info );
5604 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5605 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5607 if ( info->params.mode == MGSL_MODE_HDLC ||
5608 info->params.mode == MGSL_MODE_RAW ) {
5609 /* DMA mode Transfers */
5610 /* Program the DMA controller. */
5611 /* Enable the DMA controller end of buffer interrupt. */
5613 /* program 16C32 with physical address of 1st DMA buffer entry */
5614 phys_addr = info->rx_buffer_list[0].phys_entry;
5615 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5616 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5618 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5619 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5620 usc_EnableInterrupts( info, RECEIVE_STATUS );
5622 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5623 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5625 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5626 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5627 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5628 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5629 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5631 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5633 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
5634 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
5635 usc_EnableInterrupts(info, RECEIVE_DATA);
5637 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5638 usc_RCmd( info, RCmd_EnterHuntmode );
5640 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5643 usc_OutReg( info, CCSR, 0x1020 );
5645 info->rx_enabled = 1;
5647 } /* end of usc_start_receiver() */
5649 /* usc_start_transmitter()
5651 * Enable the USC transmitter and send a transmit frame if
5652 * one is loaded in the DMA buffers.
5654 * Arguments: info pointer to device instance data
5655 * Return Value: None
5657 static void usc_start_transmitter( struct mgsl_struct *info )
5660 unsigned int FrameSize;
5662 if (debug_level >= DEBUG_LEVEL_ISR)
5663 printk("%s(%d):usc_start_transmitter(%s)\n",
5664 __FILE__,__LINE__, info->device_name );
5666 if ( info->xmit_cnt ) {
5668 /* If auto RTS enabled and RTS is inactive, then assert */
5669 /* RTS and set a flag indicating that the driver should */
5670 /* negate RTS when the transmission completes. */
5672 info->drop_rts_on_tx_done = 0;
5674 if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
5675 usc_get_serial_signals( info );
5676 if ( !(info->serial_signals & SerialSignal_RTS) ) {
5677 info->serial_signals |= SerialSignal_RTS;
5678 usc_set_serial_signals( info );
5679 info->drop_rts_on_tx_done = 1;
5684 if ( info->params.mode == MGSL_MODE_ASYNC ) {
5685 if ( !info->tx_active ) {
5686 usc_UnlatchTxstatusBits(info, TXSTATUS_ALL);
5687 usc_ClearIrqPendingBits(info, TRANSMIT_STATUS + TRANSMIT_DATA);
5688 usc_EnableInterrupts(info, TRANSMIT_DATA);
5689 usc_load_txfifo(info);
5692 /* Disable transmit DMA controller while programming. */
5693 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5695 /* Transmit DMA buffer is loaded, so program USC */
5696 /* to send the frame contained in the buffers. */
5698 FrameSize = info->tx_buffer_list[info->start_tx_dma_buffer].rcc;
5700 /* if operating in Raw sync mode, reset the rcc component
5701 * of the tx dma buffer entry, otherwise, the serial controller
5702 * will send a closing sync char after this count.
5704 if ( info->params.mode == MGSL_MODE_RAW )
5705 info->tx_buffer_list[info->start_tx_dma_buffer].rcc = 0;
5707 /* Program the Transmit Character Length Register (TCLR) */
5708 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
5709 usc_OutReg( info, TCLR, (u16)FrameSize );
5711 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5713 /* Program the address of the 1st DMA Buffer Entry in linked list */
5714 phys_addr = info->tx_buffer_list[info->start_tx_dma_buffer].phys_entry;
5715 usc_OutDmaReg( info, NTARL, (u16)phys_addr );
5716 usc_OutDmaReg( info, NTARU, (u16)(phys_addr >> 16) );
5718 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5719 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
5720 usc_EnableInterrupts( info, TRANSMIT_STATUS );
5722 if ( info->params.mode == MGSL_MODE_RAW &&
5723 info->num_tx_dma_buffers > 1 ) {
5724 /* When running external sync mode, attempt to 'stream' transmit */
5725 /* by filling tx dma buffers as they become available. To do this */
5726 /* we need to enable Tx DMA EOB Status interrupts : */
5728 /* 1. Arm End of Buffer (EOB) Transmit DMA Interrupt (BIT2 of TDIAR) */
5729 /* 2. Enable Transmit DMA Interrupts (BIT0 of DICR) */
5731 usc_OutDmaReg( info, TDIAR, BIT2|BIT3 );
5732 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT0) );
5735 /* Initialize Transmit DMA Channel */
5736 usc_DmaCmd( info, DmaCmd_InitTxChannel );
5738 usc_TCmd( info, TCmd_SendFrame );
5740 info->tx_timer.expires = jiffies + msecs_to_jiffies(5000);
5741 add_timer(&info->tx_timer);
5743 info->tx_active = 1;
5746 if ( !info->tx_enabled ) {
5747 info->tx_enabled = 1;
5748 if ( info->params.flags & HDLC_FLAG_AUTO_CTS )
5749 usc_EnableTransmitter(info,ENABLE_AUTO_CTS);
5751 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
5754 } /* end of usc_start_transmitter() */
5756 /* usc_stop_transmitter()
5758 * Stops the transmitter and DMA
5760 * Arguments: info pointer to device isntance data
5761 * Return Value: None
5763 static void usc_stop_transmitter( struct mgsl_struct *info )
5765 if (debug_level >= DEBUG_LEVEL_ISR)
5766 printk("%s(%d):usc_stop_transmitter(%s)\n",
5767 __FILE__,__LINE__, info->device_name );
5769 del_timer(&info->tx_timer);
5771 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5772 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5773 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5775 usc_EnableTransmitter(info,DISABLE_UNCONDITIONAL);
5776 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5777 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5779 info->tx_enabled = 0;
5780 info->tx_active = 0;
5782 } /* end of usc_stop_transmitter() */
5784 /* usc_load_txfifo()
5786 * Fill the transmit FIFO until the FIFO is full or
5787 * there is no more data to load.
5789 * Arguments: info pointer to device extension (instance data)
5790 * Return Value: None
5792 static void usc_load_txfifo( struct mgsl_struct *info )
5797 if ( !info->xmit_cnt && !info->x_char )
5800 /* Select transmit FIFO status readback in TICR */
5801 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
5803 /* load the Transmit FIFO until FIFOs full or all data sent */
5805 while( (Fifocount = usc_InReg(info, TICR) >> 8) && info->xmit_cnt ) {
5806 /* there is more space in the transmit FIFO and */
5807 /* there is more data in transmit buffer */
5809 if ( (info->xmit_cnt > 1) && (Fifocount > 1) && !info->x_char ) {
5810 /* write a 16-bit word from transmit buffer to 16C32 */
5812 TwoBytes[0] = info->xmit_buf[info->xmit_tail++];
5813 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5814 TwoBytes[1] = info->xmit_buf[info->xmit_tail++];
5815 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5817 outw( *((u16 *)TwoBytes), info->io_base + DATAREG);
5819 info->xmit_cnt -= 2;
5820 info->icount.tx += 2;
5822 /* only 1 byte left to transmit or 1 FIFO slot left */
5824 outw( (inw( info->io_base + CCAR) & 0x0780) | (TDR+LSBONLY),
5825 info->io_base + CCAR );
5828 /* transmit pending high priority char */
5829 outw( info->x_char,info->io_base + CCAR );
5832 outw( info->xmit_buf[info->xmit_tail++],info->io_base + CCAR );
5833 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5840 } /* end of usc_load_txfifo() */
5844 * Reset the adapter to a known state and prepare it for further use.
5846 * Arguments: info pointer to device instance data
5847 * Return Value: None
5849 static void usc_reset( struct mgsl_struct *info )
5851 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5855 /* Set BIT30 of Misc Control Register */
5856 /* (Local Control Register 0x50) to force reset of USC. */
5858 volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5859 u32 *LCR0BRDR = (u32 *)(info->lcr_base + 0x28);
5861 info->misc_ctrl_value |= BIT30;
5862 *MiscCtrl = info->misc_ctrl_value;
5865 * Force at least 170ns delay before clearing
5866 * reset bit. Each read from LCR takes at least
5867 * 30ns so 10 times for 300ns to be safe.
5870 readval = *MiscCtrl;
5872 info->misc_ctrl_value &= ~BIT30;
5873 *MiscCtrl = info->misc_ctrl_value;
5875 *LCR0BRDR = BUS_DESCRIPTOR(
5876 1, // Write Strobe Hold (0-3)
5877 2, // Write Strobe Delay (0-3)
5878 2, // Read Strobe Delay (0-3)
5879 0, // NWDD (Write data-data) (0-3)
5880 4, // NWAD (Write Addr-data) (0-31)
5881 0, // NXDA (Read/Write Data-Addr) (0-3)
5882 0, // NRDD (Read Data-Data) (0-3)
5883 5 // NRAD (Read Addr-Data) (0-31)
5887 outb( 0,info->io_base + 8 );
5891 info->loopback_bits = 0;
5892 info->usc_idle_mode = 0;
5895 * Program the Bus Configuration Register (BCR)
5897 * <15> 0 Don't use separate address
5898 * <14..6> 0 reserved
5899 * <5..4> 00 IAckmode = Default, don't care
5900 * <3> 1 Bus Request Totem Pole output
5901 * <2> 1 Use 16 Bit data bus
5902 * <1> 0 IRQ Totem Pole output
5903 * <0> 0 Don't Shift Right Addr
5905 * 0000 0000 0000 1100 = 0x000c
5907 * By writing to io_base + SDPIN the Wait/Ack pin is
5908 * programmed to work as a Wait pin.
5911 outw( 0x000c,info->io_base + SDPIN );
5914 outw( 0,info->io_base );
5915 outw( 0,info->io_base + CCAR );
5917 /* select little endian byte ordering */
5918 usc_RTCmd( info, RTCmd_SelectLittleEndian );
5921 /* Port Control Register (PCR)
5923 * <15..14> 11 Port 7 is Output (~DMAEN, Bit 14 : 0 = Enabled)
5924 * <13..12> 11 Port 6 is Output (~INTEN, Bit 12 : 0 = Enabled)
5925 * <11..10> 00 Port 5 is Input (No Connect, Don't Care)
5926 * <9..8> 00 Port 4 is Input (No Connect, Don't Care)
5927 * <7..6> 11 Port 3 is Output (~RTS, Bit 6 : 0 = Enabled )
5928 * <5..4> 11 Port 2 is Output (~DTR, Bit 4 : 0 = Enabled )
5929 * <3..2> 01 Port 1 is Input (Dedicated RxC)
5930 * <1..0> 01 Port 0 is Input (Dedicated TxC)
5932 * 1111 0000 1111 0101 = 0xf0f5
5935 usc_OutReg( info, PCR, 0xf0f5 );
5939 * Input/Output Control Register
5941 * <15..14> 00 CTS is active low input
5942 * <13..12> 00 DCD is active low input
5943 * <11..10> 00 TxREQ pin is input (DSR)
5944 * <9..8> 00 RxREQ pin is input (RI)
5945 * <7..6> 00 TxD is output (Transmit Data)
5946 * <5..3> 000 TxC Pin in Input (14.7456MHz Clock)
5947 * <2..0> 100 RxC is Output (drive with BRG0)
5949 * 0000 0000 0000 0100 = 0x0004
5952 usc_OutReg( info, IOCR, 0x0004 );
5954 } /* end of usc_reset() */
5956 /* usc_set_async_mode()
5958 * Program adapter for asynchronous communications.
5960 * Arguments: info pointer to device instance data
5961 * Return Value: None
5963 static void usc_set_async_mode( struct mgsl_struct *info )
5967 /* disable interrupts while programming USC */
5968 usc_DisableMasterIrqBit( info );
5970 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5971 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5973 usc_loopback_frame( info );
5975 /* Channel mode Register (CMR)
5977 * <15..14> 00 Tx Sub modes, 00 = 1 Stop Bit
5978 * <13..12> 00 00 = 16X Clock
5979 * <11..8> 0000 Transmitter mode = Asynchronous
5980 * <7..6> 00 reserved?
5981 * <5..4> 00 Rx Sub modes, 00 = 16X Clock
5982 * <3..0> 0000 Receiver mode = Asynchronous
5984 * 0000 0000 0000 0000 = 0x0
5988 if ( info->params.stop_bits != 1 )
5990 usc_OutReg( info, CMR, RegValue );
5993 /* Receiver mode Register (RMR)
5995 * <15..13> 000 encoding = None
5996 * <12..08> 00000 reserved (Sync Only)
5997 * <7..6> 00 Even parity
5998 * <5> 0 parity disabled
5999 * <4..2> 000 Receive Char Length = 8 bits
6000 * <1..0> 00 Disable Receiver
6002 * 0000 0000 0000 0000 = 0x0
6007 if ( info->params.data_bits != 8 )
6008 RegValue |= BIT4+BIT3+BIT2;
6010 if ( info->params.parity != ASYNC_PARITY_NONE ) {
6012 if ( info->params.parity != ASYNC_PARITY_ODD )
6016 usc_OutReg( info, RMR, RegValue );
6019 /* Set IRQ trigger level */
6021 usc_RCmd( info, RCmd_SelectRicrIntLevel );
6024 /* Receive Interrupt Control Register (RICR)
6026 * <15..8> ? RxFIFO IRQ Request Level
6028 * Note: For async mode the receive FIFO level must be set
6029 * to 0 to aviod the situation where the FIFO contains fewer bytes
6030 * than the trigger level and no more data is expected.
6032 * <7> 0 Exited Hunt IA (Interrupt Arm)
6033 * <6> 0 Idle Received IA
6034 * <5> 0 Break/Abort IA
6036 * <3> 0 Queued status reflects oldest byte in FIFO
6038 * <1> 0 Rx Overrun IA
6039 * <0> 0 Select TC0 value for readback
6041 * 0000 0000 0100 0000 = 0x0000 + (FIFOLEVEL in MSB)
6044 usc_OutReg( info, RICR, 0x0000 );
6046 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
6047 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
6050 /* Transmit mode Register (TMR)
6052 * <15..13> 000 encoding = None
6053 * <12..08> 00000 reserved (Sync Only)
6054 * <7..6> 00 Transmit parity Even
6055 * <5> 0 Transmit parity Disabled
6056 * <4..2> 000 Tx Char Length = 8 bits
6057 * <1..0> 00 Disable Transmitter
6059 * 0000 0000 0000 0000 = 0x0
6064 if ( info->params.data_bits != 8 )
6065 RegValue |= BIT4+BIT3+BIT2;
6067 if ( info->params.parity != ASYNC_PARITY_NONE ) {
6069 if ( info->params.parity != ASYNC_PARITY_ODD )
6073 usc_OutReg( info, TMR, RegValue );
6075 usc_set_txidle( info );
6078 /* Set IRQ trigger level */
6080 usc_TCmd( info, TCmd_SelectTicrIntLevel );
6083 /* Transmit Interrupt Control Register (TICR)
6085 * <15..8> ? Transmit FIFO IRQ Level
6086 * <7> 0 Present IA (Interrupt Arm)
6087 * <6> 1 Idle Sent IA
6088 * <5> 0 Abort Sent IA
6089 * <4> 0 EOF/EOM Sent IA
6091 * <2> 0 1 = Wait for SW Trigger to Start Frame
6092 * <1> 0 Tx Underrun IA
6093 * <0> 0 TC0 constant on read back
6095 * 0000 0000 0100 0000 = 0x0040
6098 usc_OutReg( info, TICR, 0x1f40 );
6100 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
6101 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
6103 usc_enable_async_clock( info, info->params.data_rate );
6106 /* Channel Control/status Register (CCSR)
6108 * <15> X RCC FIFO Overflow status (RO)
6109 * <14> X RCC FIFO Not Empty status (RO)
6110 * <13> 0 1 = Clear RCC FIFO (WO)
6111 * <12> X DPLL in Sync status (RO)
6112 * <11> X DPLL 2 Missed Clocks status (RO)
6113 * <10> X DPLL 1 Missed Clock status (RO)
6114 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
6115 * <7> X SDLC Loop On status (RO)
6116 * <6> X SDLC Loop Send status (RO)
6117 * <5> 1 Bypass counters for TxClk and RxClk (RW)
6118 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
6119 * <1..0> 00 reserved
6121 * 0000 0000 0010 0000 = 0x0020
6124 usc_OutReg( info, CCSR, 0x0020 );
6126 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6127 RECEIVE_DATA + RECEIVE_STATUS );
6129 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6130 RECEIVE_DATA + RECEIVE_STATUS );
6132 usc_EnableMasterIrqBit( info );
6134 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6135 /* Enable INTEN (Port 6, Bit12) */
6136 /* This connects the IRQ request signal to the ISA bus */
6137 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6140 if (info->params.loopback) {
6141 info->loopback_bits = 0x300;
6142 outw(0x0300, info->io_base + CCAR);
6145 } /* end of usc_set_async_mode() */
6147 /* usc_loopback_frame()
6149 * Loop back a small (2 byte) dummy SDLC frame.
6150 * Interrupts and DMA are NOT used. The purpose of this is to
6151 * clear any 'stale' status info left over from running in async mode.
6153 * The 16C32 shows the strange behaviour of marking the 1st
6154 * received SDLC frame with a CRC error even when there is no
6155 * CRC error. To get around this a small dummy from of 2 bytes
6156 * is looped back when switching from async to sync mode.
6158 * Arguments: info pointer to device instance data
6159 * Return Value: None
6161 static void usc_loopback_frame( struct mgsl_struct *info )
6164 unsigned long oldmode = info->params.mode;
6166 info->params.mode = MGSL_MODE_HDLC;
6168 usc_DisableMasterIrqBit( info );
6170 usc_set_sdlc_mode( info );
6171 usc_enable_loopback( info, 1 );
6173 /* Write 16-bit Time Constant for BRG0 */
6174 usc_OutReg( info, TC0R, 0 );
6176 /* Channel Control Register (CCR)
6178 * <15..14> 00 Don't use 32-bit Tx Control Blocks (TCBs)
6179 * <13> 0 Trigger Tx on SW Command Disabled
6180 * <12> 0 Flag Preamble Disabled
6181 * <11..10> 00 Preamble Length = 8-Bits
6182 * <9..8> 01 Preamble Pattern = flags
6183 * <7..6> 10 Don't use 32-bit Rx status Blocks (RSBs)
6184 * <5> 0 Trigger Rx on SW Command Disabled
6187 * 0000 0001 0000 0000 = 0x0100
6190 usc_OutReg( info, CCR, 0x0100 );
6192 /* SETUP RECEIVER */
6193 usc_RTCmd( info, RTCmd_PurgeRxFifo );
6194 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
6196 /* SETUP TRANSMITTER */
6197 /* Program the Transmit Character Length Register (TCLR) */
6198 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
6199 usc_OutReg( info, TCLR, 2 );
6200 usc_RTCmd( info, RTCmd_PurgeTxFifo );
6202 /* unlatch Tx status bits, and start transmit channel. */
6203 usc_UnlatchTxstatusBits(info,TXSTATUS_ALL);
6204 outw(0,info->io_base + DATAREG);
6206 /* ENABLE TRANSMITTER */
6207 usc_TCmd( info, TCmd_SendFrame );
6208 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
6210 /* WAIT FOR RECEIVE COMPLETE */
6211 for (i=0 ; i<1000 ; i++)
6212 if (usc_InReg( info, RCSR ) & (BIT8 + BIT4 + BIT3 + BIT1))
6215 /* clear Internal Data loopback mode */
6216 usc_enable_loopback(info, 0);
6218 usc_EnableMasterIrqBit(info);
6220 info->params.mode = oldmode;
6222 } /* end of usc_loopback_frame() */
6224 /* usc_set_sync_mode() Programs the USC for SDLC communications.
6226 * Arguments: info pointer to adapter info structure
6227 * Return Value: None
6229 static void usc_set_sync_mode( struct mgsl_struct *info )
6231 usc_loopback_frame( info );
6232 usc_set_sdlc_mode( info );
6234 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6235 /* Enable INTEN (Port 6, Bit12) */
6236 /* This connects the IRQ request signal to the ISA bus */
6237 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6240 usc_enable_aux_clock(info, info->params.clock_speed);
6242 if (info->params.loopback)
6243 usc_enable_loopback(info,1);
6245 } /* end of mgsl_set_sync_mode() */
6247 /* usc_set_txidle() Set the HDLC idle mode for the transmitter.
6249 * Arguments: info pointer to device instance data
6250 * Return Value: None
6252 static void usc_set_txidle( struct mgsl_struct *info )
6254 u16 usc_idle_mode = IDLEMODE_FLAGS;
6256 /* Map API idle mode to USC register bits */
6258 switch( info->idle_mode ){
6259 case HDLC_TXIDLE_FLAGS: usc_idle_mode = IDLEMODE_FLAGS; break;
6260 case HDLC_TXIDLE_ALT_ZEROS_ONES: usc_idle_mode = IDLEMODE_ALT_ONE_ZERO; break;
6261 case HDLC_TXIDLE_ZEROS: usc_idle_mode = IDLEMODE_ZERO; break;
6262 case HDLC_TXIDLE_ONES: usc_idle_mode = IDLEMODE_ONE; break;
6263 case HDLC_TXIDLE_ALT_MARK_SPACE: usc_idle_mode = IDLEMODE_ALT_MARK_SPACE; break;
6264 case HDLC_TXIDLE_SPACE: usc_idle_mode = IDLEMODE_SPACE; break;
6265 case HDLC_TXIDLE_MARK: usc_idle_mode = IDLEMODE_MARK; break;
6268 info->usc_idle_mode = usc_idle_mode;
6269 //usc_OutReg(info, TCSR, usc_idle_mode);
6270 info->tcsr_value &= ~IDLEMODE_MASK; /* clear idle mode bits */
6271 info->tcsr_value += usc_idle_mode;
6272 usc_OutReg(info, TCSR, info->tcsr_value);
6275 * if SyncLink WAN adapter is running in external sync mode, the
6276 * transmitter has been set to Monosync in order to try to mimic
6277 * a true raw outbound bit stream. Monosync still sends an open/close
6278 * sync char at the start/end of a frame. Try to match those sync
6279 * patterns to the idle mode set here
6281 if ( info->params.mode == MGSL_MODE_RAW ) {
6282 unsigned char syncpat = 0;
6283 switch( info->idle_mode ) {
6284 case HDLC_TXIDLE_FLAGS:
6287 case HDLC_TXIDLE_ALT_ZEROS_ONES:
6290 case HDLC_TXIDLE_ZEROS:
6291 case HDLC_TXIDLE_SPACE:
6294 case HDLC_TXIDLE_ONES:
6295 case HDLC_TXIDLE_MARK:
6298 case HDLC_TXIDLE_ALT_MARK_SPACE:
6303 usc_SetTransmitSyncChars(info,syncpat,syncpat);
6306 } /* end of usc_set_txidle() */
6308 /* usc_get_serial_signals()
6310 * Query the adapter for the state of the V24 status (input) signals.
6312 * Arguments: info pointer to device instance data
6313 * Return Value: None
6315 static void usc_get_serial_signals( struct mgsl_struct *info )
6319 /* clear all serial signals except DTR and RTS */
6320 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
6322 /* Read the Misc Interrupt status Register (MISR) to get */
6323 /* the V24 status signals. */
6325 status = usc_InReg( info, MISR );
6327 /* set serial signal bits to reflect MISR */
6329 if ( status & MISCSTATUS_CTS )
6330 info->serial_signals |= SerialSignal_CTS;
6332 if ( status & MISCSTATUS_DCD )
6333 info->serial_signals |= SerialSignal_DCD;
6335 if ( status & MISCSTATUS_RI )
6336 info->serial_signals |= SerialSignal_RI;
6338 if ( status & MISCSTATUS_DSR )
6339 info->serial_signals |= SerialSignal_DSR;
6341 } /* end of usc_get_serial_signals() */
6343 /* usc_set_serial_signals()
6345 * Set the state of DTR and RTS based on contents of
6346 * serial_signals member of device extension.
6348 * Arguments: info pointer to device instance data
6349 * Return Value: None
6351 static void usc_set_serial_signals( struct mgsl_struct *info )
6354 unsigned char V24Out = info->serial_signals;
6356 /* get the current value of the Port Control Register (PCR) */
6358 Control = usc_InReg( info, PCR );
6360 if ( V24Out & SerialSignal_RTS )
6365 if ( V24Out & SerialSignal_DTR )
6370 usc_OutReg( info, PCR, Control );
6372 } /* end of usc_set_serial_signals() */
6374 /* usc_enable_async_clock()
6376 * Enable the async clock at the specified frequency.
6378 * Arguments: info pointer to device instance data
6379 * data_rate data rate of clock in bps
6380 * 0 disables the AUX clock.
6381 * Return Value: None
6383 static void usc_enable_async_clock( struct mgsl_struct *info, u32 data_rate )
6387 * Clock mode Control Register (CMCR)
6389 * <15..14> 00 counter 1 Disabled
6390 * <13..12> 00 counter 0 Disabled
6391 * <11..10> 11 BRG1 Input is TxC Pin
6392 * <9..8> 11 BRG0 Input is TxC Pin
6393 * <7..6> 01 DPLL Input is BRG1 Output
6394 * <5..3> 100 TxCLK comes from BRG0
6395 * <2..0> 100 RxCLK comes from BRG0
6397 * 0000 1111 0110 0100 = 0x0f64
6400 usc_OutReg( info, CMCR, 0x0f64 );
6404 * Write 16-bit Time Constant for BRG0
6405 * Time Constant = (ClkSpeed / data_rate) - 1
6406 * ClkSpeed = 921600 (ISA), 691200 (PCI)
6409 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6410 usc_OutReg( info, TC0R, (u16)((691200/data_rate) - 1) );
6412 usc_OutReg( info, TC0R, (u16)((921600/data_rate) - 1) );
6416 * Hardware Configuration Register (HCR)
6417 * Clear Bit 1, BRG0 mode = Continuous
6418 * Set Bit 0 to enable BRG0.
6421 usc_OutReg( info, HCR,
6422 (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
6425 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
6427 usc_OutReg( info, IOCR,
6428 (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
6430 /* data rate == 0 so turn off BRG0 */
6431 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
6434 } /* end of usc_enable_async_clock() */
6437 * Buffer Structures:
6439 * Normal memory access uses virtual addresses that can make discontiguous
6440 * physical memory pages appear to be contiguous in the virtual address
6441 * space (the processors memory mapping handles the conversions).
6443 * DMA transfers require physically contiguous memory. This is because
6444 * the DMA system controller and DMA bus masters deal with memory using
6445 * only physical addresses.
6447 * This causes a problem under Windows NT when large DMA buffers are
6448 * needed. Fragmentation of the nonpaged pool prevents allocations of
6449 * physically contiguous buffers larger than the PAGE_SIZE.
6451 * However the 16C32 supports Bus Master Scatter/Gather DMA which
6452 * allows DMA transfers to physically discontiguous buffers. Information
6453 * about each data transfer buffer is contained in a memory structure
6454 * called a 'buffer entry'. A list of buffer entries is maintained
6455 * to track and control the use of the data transfer buffers.
6457 * To support this strategy we will allocate sufficient PAGE_SIZE
6458 * contiguous memory buffers to allow for the total required buffer
6461 * The 16C32 accesses the list of buffer entries using Bus Master
6462 * DMA. Control information is read from the buffer entries by the
6463 * 16C32 to control data transfers. status information is written to
6464 * the buffer entries by the 16C32 to indicate the status of completed
6467 * The CPU writes control information to the buffer entries to control
6468 * the 16C32 and reads status information from the buffer entries to
6469 * determine information about received and transmitted frames.
6471 * Because the CPU and 16C32 (adapter) both need simultaneous access
6472 * to the buffer entries, the buffer entry memory is allocated with
6473 * HalAllocateCommonBuffer(). This restricts the size of the buffer
6474 * entry list to PAGE_SIZE.
6476 * The actual data buffers on the other hand will only be accessed
6477 * by the CPU or the adapter but not by both simultaneously. This allows
6478 * Scatter/Gather packet based DMA procedures for using physically
6479 * discontiguous pages.
6483 * mgsl_reset_tx_dma_buffers()
6485 * Set the count for all transmit buffers to 0 to indicate the
6486 * buffer is available for use and set the current buffer to the
6487 * first buffer. This effectively makes all buffers free and
6488 * discards any data in buffers.
6490 * Arguments: info pointer to device instance data
6491 * Return Value: None
6493 static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info )
6497 for ( i = 0; i < info->tx_buffer_count; i++ ) {
6498 *((unsigned long *)&(info->tx_buffer_list[i].count)) = 0;
6501 info->current_tx_buffer = 0;
6502 info->start_tx_dma_buffer = 0;
6503 info->tx_dma_buffers_used = 0;
6505 info->get_tx_holding_index = 0;
6506 info->put_tx_holding_index = 0;
6507 info->tx_holding_count = 0;
6509 } /* end of mgsl_reset_tx_dma_buffers() */
6512 * num_free_tx_dma_buffers()
6514 * returns the number of free tx dma buffers available
6516 * Arguments: info pointer to device instance data
6517 * Return Value: number of free tx dma buffers
6519 static int num_free_tx_dma_buffers(struct mgsl_struct *info)
6521 return info->tx_buffer_count - info->tx_dma_buffers_used;
6525 * mgsl_reset_rx_dma_buffers()
6527 * Set the count for all receive buffers to DMABUFFERSIZE
6528 * and set the current buffer to the first buffer. This effectively
6529 * makes all buffers free and discards any data in buffers.
6531 * Arguments: info pointer to device instance data
6532 * Return Value: None
6534 static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info )
6538 for ( i = 0; i < info->rx_buffer_count; i++ ) {
6539 *((unsigned long *)&(info->rx_buffer_list[i].count)) = DMABUFFERSIZE;
6540 // info->rx_buffer_list[i].count = DMABUFFERSIZE;
6541 // info->rx_buffer_list[i].status = 0;
6544 info->current_rx_buffer = 0;
6546 } /* end of mgsl_reset_rx_dma_buffers() */
6549 * mgsl_free_rx_frame_buffers()
6551 * Free the receive buffers used by a received SDLC
6552 * frame such that the buffers can be reused.
6556 * info pointer to device instance data
6557 * StartIndex index of 1st receive buffer of frame
6558 * EndIndex index of last receive buffer of frame
6560 * Return Value: None
6562 static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex )
6565 DMABUFFERENTRY *pBufEntry;
6568 /* Starting with 1st buffer entry of the frame clear the status */
6569 /* field and set the count field to DMA Buffer Size. */
6574 pBufEntry = &(info->rx_buffer_list[Index]);
6576 if ( Index == EndIndex ) {
6577 /* This is the last buffer of the frame! */
6581 /* reset current buffer for reuse */
6582 // pBufEntry->status = 0;
6583 // pBufEntry->count = DMABUFFERSIZE;
6584 *((unsigned long *)&(pBufEntry->count)) = DMABUFFERSIZE;
6586 /* advance to next buffer entry in linked list */
6588 if ( Index == info->rx_buffer_count )
6592 /* set current buffer to next buffer after last buffer of frame */
6593 info->current_rx_buffer = Index;
6595 } /* end of free_rx_frame_buffers() */
6597 /* mgsl_get_rx_frame()
6599 * This function attempts to return a received SDLC frame from the
6600 * receive DMA buffers. Only frames received without errors are returned.
6602 * Arguments: info pointer to device extension
6603 * Return Value: 1 if frame returned, otherwise 0
6605 static int mgsl_get_rx_frame(struct mgsl_struct *info)
6607 unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
6608 unsigned short status;
6609 DMABUFFERENTRY *pBufEntry;
6610 unsigned int framesize = 0;
6612 unsigned long flags;
6613 struct tty_struct *tty = info->tty;
6614 int return_frame = 0;
6617 * current_rx_buffer points to the 1st buffer of the next available
6618 * receive frame. To find the last buffer of the frame look for
6619 * a non-zero status field in the buffer entries. (The status
6620 * field is set by the 16C32 after completing a receive frame.
6623 StartIndex = EndIndex = info->current_rx_buffer;
6625 while( !info->rx_buffer_list[EndIndex].status ) {
6627 * If the count field of the buffer entry is non-zero then
6628 * this buffer has not been used. (The 16C32 clears the count
6629 * field when it starts using the buffer.) If an unused buffer
6630 * is encountered then there are no frames available.
6633 if ( info->rx_buffer_list[EndIndex].count )
6636 /* advance to next buffer entry in linked list */
6638 if ( EndIndex == info->rx_buffer_count )
6641 /* if entire list searched then no frame available */
6642 if ( EndIndex == StartIndex ) {
6643 /* If this occurs then something bad happened,
6644 * all buffers have been 'used' but none mark
6645 * the end of a frame. Reset buffers and receiver.
6648 if ( info->rx_enabled ){
6649 spin_lock_irqsave(&info->irq_spinlock,flags);
6650 usc_start_receiver(info);
6651 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6658 /* check status of receive frame */
6660 status = info->rx_buffer_list[EndIndex].status;
6662 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6663 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6664 if ( status & RXSTATUS_SHORT_FRAME )
6665 info->icount.rxshort++;
6666 else if ( status & RXSTATUS_ABORT )
6667 info->icount.rxabort++;
6668 else if ( status & RXSTATUS_OVERRUN )
6669 info->icount.rxover++;
6671 info->icount.rxcrc++;
6672 if ( info->params.crc_type & HDLC_CRC_RETURN_EX )
6678 struct net_device_stats *stats = hdlc_stats(info->netdev);
6680 stats->rx_frame_errors++;
6686 if ( return_frame ) {
6687 /* receive frame has no errors, get frame size.
6688 * The frame size is the starting value of the RCC (which was
6689 * set to 0xffff) minus the ending value of the RCC (decremented
6690 * once for each receive character) minus 2 for the 16-bit CRC.
6693 framesize = RCLRVALUE - info->rx_buffer_list[EndIndex].rcc;
6695 /* adjust frame size for CRC if any */
6696 if ( info->params.crc_type == HDLC_CRC_16_CCITT )
6698 else if ( info->params.crc_type == HDLC_CRC_32_CCITT )
6702 if ( debug_level >= DEBUG_LEVEL_BH )
6703 printk("%s(%d):mgsl_get_rx_frame(%s) status=%04X size=%d\n",
6704 __FILE__,__LINE__,info->device_name,status,framesize);
6706 if ( debug_level >= DEBUG_LEVEL_DATA )
6707 mgsl_trace_block(info,info->rx_buffer_list[StartIndex].virt_addr,
6708 min_t(int, framesize, DMABUFFERSIZE),0);
6711 if ( ( (info->params.crc_type & HDLC_CRC_RETURN_EX) &&
6712 ((framesize+1) > info->max_frame_size) ) ||
6713 (framesize > info->max_frame_size) )
6714 info->icount.rxlong++;
6716 /* copy dma buffer(s) to contiguous intermediate buffer */
6717 int copy_count = framesize;
6718 int index = StartIndex;
6719 unsigned char *ptmp = info->intermediate_rxbuffer;
6721 if ( !(status & RXSTATUS_CRC_ERROR))
6722 info->icount.rxok++;
6726 if ( copy_count > DMABUFFERSIZE )
6727 partial_count = DMABUFFERSIZE;
6729 partial_count = copy_count;
6731 pBufEntry = &(info->rx_buffer_list[index]);
6732 memcpy( ptmp, pBufEntry->virt_addr, partial_count );
6733 ptmp += partial_count;
6734 copy_count -= partial_count;
6736 if ( ++index == info->rx_buffer_count )
6740 if ( info->params.crc_type & HDLC_CRC_RETURN_EX ) {
6742 *ptmp = (status & RXSTATUS_CRC_ERROR ?
6746 if ( debug_level >= DEBUG_LEVEL_DATA )
6747 printk("%s(%d):mgsl_get_rx_frame(%s) rx frame status=%d\n",
6748 __FILE__,__LINE__,info->device_name,
6754 hdlcdev_rx(info,info->intermediate_rxbuffer,framesize);
6757 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6760 /* Free the buffers used by this frame. */
6761 mgsl_free_rx_frame_buffers( info, StartIndex, EndIndex );
6767 if ( info->rx_enabled && info->rx_overflow ) {
6768 /* The receiver needs to restarted because of
6769 * a receive overflow (buffer or FIFO). If the
6770 * receive buffers are now empty, then restart receiver.
6773 if ( !info->rx_buffer_list[EndIndex].status &&
6774 info->rx_buffer_list[EndIndex].count ) {
6775 spin_lock_irqsave(&info->irq_spinlock,flags);
6776 usc_start_receiver(info);
6777 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6783 } /* end of mgsl_get_rx_frame() */
6785 /* mgsl_get_raw_rx_frame()
6787 * This function attempts to return a received frame from the
6788 * receive DMA buffers when running in external loop mode. In this mode,
6789 * we will return at most one DMABUFFERSIZE frame to the application.
6790 * The USC receiver is triggering off of DCD going active to start a new
6791 * frame, and DCD going inactive to terminate the frame (similar to
6792 * processing a closing flag character).
6794 * In this routine, we will return DMABUFFERSIZE "chunks" at a time.
6795 * If DCD goes inactive, the last Rx DMA Buffer will have a non-zero
6796 * status field and the RCC field will indicate the length of the
6797 * entire received frame. We take this RCC field and get the modulus
6798 * of RCC and DMABUFFERSIZE to determine if number of bytes in the
6799 * last Rx DMA buffer and return that last portion of the frame.
6801 * Arguments: info pointer to device extension
6802 * Return Value: 1 if frame returned, otherwise 0
6804 static int mgsl_get_raw_rx_frame(struct mgsl_struct *info)
6806 unsigned int CurrentIndex, NextIndex;
6807 unsigned short status;
6808 DMABUFFERENTRY *pBufEntry;
6809 unsigned int framesize = 0;
6811 unsigned long flags;
6812 struct tty_struct *tty = info->tty;
6815 * current_rx_buffer points to the 1st buffer of the next available
6816 * receive frame. The status field is set by the 16C32 after
6817 * completing a receive frame. If the status field of this buffer
6818 * is zero, either the USC is still filling this buffer or this
6819 * is one of a series of buffers making up a received frame.
6821 * If the count field of this buffer is zero, the USC is either
6822 * using this buffer or has used this buffer. Look at the count
6823 * field of the next buffer. If that next buffer's count is
6824 * non-zero, the USC is still actively using the current buffer.
6825 * Otherwise, if the next buffer's count field is zero, the
6826 * current buffer is complete and the USC is using the next
6829 CurrentIndex = NextIndex = info->current_rx_buffer;
6831 if ( NextIndex == info->rx_buffer_count )
6834 if ( info->rx_buffer_list[CurrentIndex].status != 0 ||
6835 (info->rx_buffer_list[CurrentIndex].count == 0 &&
6836 info->rx_buffer_list[NextIndex].count == 0)) {
6838 * Either the status field of this dma buffer is non-zero
6839 * (indicating the last buffer of a receive frame) or the next
6840 * buffer is marked as in use -- implying this buffer is complete
6841 * and an intermediate buffer for this received frame.
6844 status = info->rx_buffer_list[CurrentIndex].status;
6846 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6847 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6848 if ( status & RXSTATUS_SHORT_FRAME )
6849 info->icount.rxshort++;
6850 else if ( status & RXSTATUS_ABORT )
6851 info->icount.rxabort++;
6852 else if ( status & RXSTATUS_OVERRUN )
6853 info->icount.rxover++;
6855 info->icount.rxcrc++;
6859 * A receive frame is available, get frame size and status.
6861 * The frame size is the starting value of the RCC (which was
6862 * set to 0xffff) minus the ending value of the RCC (decremented
6863 * once for each receive character) minus 2 or 4 for the 16-bit
6866 * If the status field is zero, this is an intermediate buffer.
6869 * If the DMA Buffer Entry's Status field is non-zero, the
6870 * receive operation completed normally (ie: DCD dropped). The
6871 * RCC field is valid and holds the received frame size.
6872 * It is possible that the RCC field will be zero on a DMA buffer
6873 * entry with a non-zero status. This can occur if the total
6874 * frame size (number of bytes between the time DCD goes active
6875 * to the time DCD goes inactive) exceeds 65535 bytes. In this
6876 * case the 16C32 has underrun on the RCC count and appears to
6877 * stop updating this counter to let us know the actual received
6878 * frame size. If this happens (non-zero status and zero RCC),
6879 * simply return the entire RxDMA Buffer
6883 * In the event that the final RxDMA Buffer is
6884 * terminated with a non-zero status and the RCC
6885 * field is zero, we interpret this as the RCC
6886 * having underflowed (received frame > 65535 bytes).
6888 * Signal the event to the user by passing back
6889 * a status of RxStatus_CrcError returning the full
6890 * buffer and let the app figure out what data is
6893 if ( info->rx_buffer_list[CurrentIndex].rcc )
6894 framesize = RCLRVALUE - info->rx_buffer_list[CurrentIndex].rcc;
6896 framesize = DMABUFFERSIZE;
6899 framesize = DMABUFFERSIZE;
6902 if ( framesize > DMABUFFERSIZE ) {
6904 * if running in raw sync mode, ISR handler for
6905 * End Of Buffer events terminates all buffers at 4K.
6906 * If this frame size is said to be >4K, get the
6907 * actual number of bytes of the frame in this buffer.
6909 framesize = framesize % DMABUFFERSIZE;
6913 if ( debug_level >= DEBUG_LEVEL_BH )
6914 printk("%s(%d):mgsl_get_raw_rx_frame(%s) status=%04X size=%d\n",
6915 __FILE__,__LINE__,info->device_name,status,framesize);
6917 if ( debug_level >= DEBUG_LEVEL_DATA )
6918 mgsl_trace_block(info,info->rx_buffer_list[CurrentIndex].virt_addr,
6919 min_t(int, framesize, DMABUFFERSIZE),0);
6922 /* copy dma buffer(s) to contiguous intermediate buffer */
6923 /* NOTE: we never copy more than DMABUFFERSIZE bytes */
6925 pBufEntry = &(info->rx_buffer_list[CurrentIndex]);
6926 memcpy( info->intermediate_rxbuffer, pBufEntry->virt_addr, framesize);
6927 info->icount.rxok++;
6929 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6932 /* Free the buffers used by this frame. */
6933 mgsl_free_rx_frame_buffers( info, CurrentIndex, CurrentIndex );
6939 if ( info->rx_enabled && info->rx_overflow ) {
6940 /* The receiver needs to restarted because of
6941 * a receive overflow (buffer or FIFO). If the
6942 * receive buffers are now empty, then restart receiver.
6945 if ( !info->rx_buffer_list[CurrentIndex].status &&
6946 info->rx_buffer_list[CurrentIndex].count ) {
6947 spin_lock_irqsave(&info->irq_spinlock,flags);
6948 usc_start_receiver(info);
6949 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6955 } /* end of mgsl_get_raw_rx_frame() */
6957 /* mgsl_load_tx_dma_buffer()
6959 * Load the transmit DMA buffer with the specified data.
6963 * info pointer to device extension
6964 * Buffer pointer to buffer containing frame to load
6965 * BufferSize size in bytes of frame in Buffer
6967 * Return Value: None
6969 static void mgsl_load_tx_dma_buffer(struct mgsl_struct *info,
6970 const char *Buffer, unsigned int BufferSize)
6972 unsigned short Copycount;
6974 DMABUFFERENTRY *pBufEntry;
6976 if ( debug_level >= DEBUG_LEVEL_DATA )
6977 mgsl_trace_block(info,Buffer, min_t(int, BufferSize, DMABUFFERSIZE), 1);
6979 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
6980 /* set CMR:13 to start transmit when
6981 * next GoAhead (abort) is received
6983 info->cmr_value |= BIT13;
6986 /* begin loading the frame in the next available tx dma
6987 * buffer, remember it's starting location for setting
6988 * up tx dma operation
6990 i = info->current_tx_buffer;
6991 info->start_tx_dma_buffer = i;
6993 /* Setup the status and RCC (Frame Size) fields of the 1st */
6994 /* buffer entry in the transmit DMA buffer list. */
6996 info->tx_buffer_list[i].status = info->cmr_value & 0xf000;
6997 info->tx_buffer_list[i].rcc = BufferSize;
6998 info->tx_buffer_list[i].count = BufferSize;
7000 /* Copy frame data from 1st source buffer to the DMA buffers. */
7001 /* The frame data may span multiple DMA buffers. */
7003 while( BufferSize ){
7004 /* Get a pointer to next DMA buffer entry. */
7005 pBufEntry = &info->tx_buffer_list[i++];
7007 if ( i == info->tx_buffer_count )
7010 /* Calculate the number of bytes that can be copied from */
7011 /* the source buffer to this DMA buffer. */
7012 if ( BufferSize > DMABUFFERSIZE )
7013 Copycount = DMABUFFERSIZE;
7015 Copycount = BufferSize;
7017 /* Actually copy data from source buffer to DMA buffer. */
7018 /* Also set the data count for this individual DMA buffer. */
7019 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
7020 mgsl_load_pci_memory(pBufEntry->virt_addr, Buffer,Copycount);
7022 memcpy(pBufEntry->virt_addr, Buffer, Copycount);
7024 pBufEntry->count = Copycount;
7026 /* Advance source pointer and reduce remaining data count. */
7027 Buffer += Copycount;
7028 BufferSize -= Copycount;
7030 ++info->tx_dma_buffers_used;
7033 /* remember next available tx dma buffer */
7034 info->current_tx_buffer = i;
7036 } /* end of mgsl_load_tx_dma_buffer() */
7039 * mgsl_register_test()
7041 * Performs a register test of the 16C32.
7043 * Arguments: info pointer to device instance data
7044 * Return Value: TRUE if test passed, otherwise FALSE
7046 static BOOLEAN mgsl_register_test( struct mgsl_struct *info )
7048 static unsigned short BitPatterns[] =
7049 { 0x0000, 0xffff, 0xaaaa, 0x5555, 0x1234, 0x6969, 0x9696, 0x0f0f };
7050 static unsigned int Patterncount = ARRAY_SIZE(BitPatterns);
7053 unsigned long flags;
7055 spin_lock_irqsave(&info->irq_spinlock,flags);
7058 /* Verify the reset state of some registers. */
7060 if ( (usc_InReg( info, SICR ) != 0) ||
7061 (usc_InReg( info, IVR ) != 0) ||
7062 (usc_InDmaReg( info, DIVR ) != 0) ){
7067 /* Write bit patterns to various registers but do it out of */
7068 /* sync, then read back and verify values. */
7070 for ( i = 0 ; i < Patterncount ; i++ ) {
7071 usc_OutReg( info, TC0R, BitPatterns[i] );
7072 usc_OutReg( info, TC1R, BitPatterns[(i+1)%Patterncount] );
7073 usc_OutReg( info, TCLR, BitPatterns[(i+2)%Patterncount] );
7074 usc_OutReg( info, RCLR, BitPatterns[(i+3)%Patterncount] );
7075 usc_OutReg( info, RSR, BitPatterns[(i+4)%Patterncount] );
7076 usc_OutDmaReg( info, TBCR, BitPatterns[(i+5)%Patterncount] );
7078 if ( (usc_InReg( info, TC0R ) != BitPatterns[i]) ||
7079 (usc_InReg( info, TC1R ) != BitPatterns[(i+1)%Patterncount]) ||
7080 (usc_InReg( info, TCLR ) != BitPatterns[(i+2)%Patterncount]) ||
7081 (usc_InReg( info, RCLR ) != BitPatterns[(i+3)%Patterncount]) ||
7082 (usc_InReg( info, RSR ) != BitPatterns[(i+4)%Patterncount]) ||
7083 (usc_InDmaReg( info, TBCR ) != BitPatterns[(i+5)%Patterncount]) ){
7091 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7095 } /* end of mgsl_register_test() */
7097 /* mgsl_irq_test() Perform interrupt test of the 16C32.
7099 * Arguments: info pointer to device instance data
7100 * Return Value: TRUE if test passed, otherwise FALSE
7102 static BOOLEAN mgsl_irq_test( struct mgsl_struct *info )
7104 unsigned long EndTime;
7105 unsigned long flags;
7107 spin_lock_irqsave(&info->irq_spinlock,flags);
7111 * Setup 16C32 to interrupt on TxC pin (14MHz clock) transition.
7112 * The ISR sets irq_occurred to 1.
7115 info->irq_occurred = FALSE;
7117 /* Enable INTEN gate for ISA adapter (Port 6, Bit12) */
7118 /* Enable INTEN (Port 6, Bit12) */
7119 /* This connects the IRQ request signal to the ISA bus */
7120 /* on the ISA adapter. This has no effect for the PCI adapter */
7121 usc_OutReg( info, PCR, (unsigned short)((usc_InReg(info, PCR) | BIT13) & ~BIT12) );
7123 usc_EnableMasterIrqBit(info);
7124 usc_EnableInterrupts(info, IO_PIN);
7125 usc_ClearIrqPendingBits(info, IO_PIN);
7127 usc_UnlatchIostatusBits(info, MISCSTATUS_TXC_LATCHED);
7128 usc_EnableStatusIrqs(info, SICR_TXC_ACTIVE + SICR_TXC_INACTIVE);
7130 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7133 while( EndTime-- && !info->irq_occurred ) {
7134 msleep_interruptible(10);
7137 spin_lock_irqsave(&info->irq_spinlock,flags);
7139 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7141 if ( !info->irq_occurred )
7146 } /* end of mgsl_irq_test() */
7150 * Perform a DMA test of the 16C32. A small frame is
7151 * transmitted via DMA from a transmit buffer to a receive buffer
7152 * using single buffer DMA mode.
7154 * Arguments: info pointer to device instance data
7155 * Return Value: TRUE if test passed, otherwise FALSE
7157 static BOOLEAN mgsl_dma_test( struct mgsl_struct *info )
7159 unsigned short FifoLevel;
7160 unsigned long phys_addr;
7161 unsigned int FrameSize;
7165 unsigned short status=0;
7166 unsigned long EndTime;
7167 unsigned long flags;
7168 MGSL_PARAMS tmp_params;
7170 /* save current port options */
7171 memcpy(&tmp_params,&info->params,sizeof(MGSL_PARAMS));
7172 /* load default port options */
7173 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
7175 #define TESTFRAMESIZE 40
7177 spin_lock_irqsave(&info->irq_spinlock,flags);
7179 /* setup 16C32 for SDLC DMA transfer mode */
7182 usc_set_sdlc_mode(info);
7183 usc_enable_loopback(info,1);
7185 /* Reprogram the RDMR so that the 16C32 does NOT clear the count
7186 * field of the buffer entry after fetching buffer address. This
7187 * way we can detect a DMA failure for a DMA read (which should be
7188 * non-destructive to system memory) before we try and write to
7189 * memory (where a failure could corrupt system memory).
7192 /* Receive DMA mode Register (RDMR)
7194 * <15..14> 11 DMA mode = Linked List Buffer mode
7195 * <13> 1 RSBinA/L = store Rx status Block in List entry
7196 * <12> 0 1 = Clear count of List Entry after fetching
7197 * <11..10> 00 Address mode = Increment
7198 * <9> 1 Terminate Buffer on RxBound
7199 * <8> 0 Bus Width = 16bits
7200 * <7..0> ? status Bits (write as 0s)
7202 * 1110 0010 0000 0000 = 0xe200
7205 usc_OutDmaReg( info, RDMR, 0xe200 );
7207 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7210 /* SETUP TRANSMIT AND RECEIVE DMA BUFFERS */
7212 FrameSize = TESTFRAMESIZE;
7214 /* setup 1st transmit buffer entry: */
7215 /* with frame size and transmit control word */
7217 info->tx_buffer_list[0].count = FrameSize;
7218 info->tx_buffer_list[0].rcc = FrameSize;
7219 info->tx_buffer_list[0].status = 0x4000;
7221 /* build a transmit frame in 1st transmit DMA buffer */
7223 TmpPtr = info->tx_buffer_list[0].virt_addr;
7224 for (i = 0; i < FrameSize; i++ )
7227 /* setup 1st receive buffer entry: */
7228 /* clear status, set max receive buffer size */
7230 info->rx_buffer_list[0].status = 0;
7231 info->rx_buffer_list[0].count = FrameSize + 4;
7233 /* zero out the 1st receive buffer */
7235 memset( info->rx_buffer_list[0].virt_addr, 0, FrameSize + 4 );
7237 /* Set count field of next buffer entries to prevent */
7238 /* 16C32 from using buffers after the 1st one. */
7240 info->tx_buffer_list[1].count = 0;
7241 info->rx_buffer_list[1].count = 0;
7244 /***************************/
7245 /* Program 16C32 receiver. */
7246 /***************************/
7248 spin_lock_irqsave(&info->irq_spinlock,flags);
7250 /* setup DMA transfers */
7251 usc_RTCmd( info, RTCmd_PurgeRxFifo );
7253 /* program 16C32 receiver with physical address of 1st DMA buffer entry */
7254 phys_addr = info->rx_buffer_list[0].phys_entry;
7255 usc_OutDmaReg( info, NRARL, (unsigned short)phys_addr );
7256 usc_OutDmaReg( info, NRARU, (unsigned short)(phys_addr >> 16) );
7258 /* Clear the Rx DMA status bits (read RDMR) and start channel */
7259 usc_InDmaReg( info, RDMR );
7260 usc_DmaCmd( info, DmaCmd_InitRxChannel );
7262 /* Enable Receiver (RMR <1..0> = 10) */
7263 usc_OutReg( info, RMR, (unsigned short)((usc_InReg(info, RMR) & 0xfffc) | 0x0002) );
7265 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7268 /*************************************************************/
7269 /* WAIT FOR RECEIVER TO DMA ALL PARAMETERS FROM BUFFER ENTRY */
7270 /*************************************************************/
7272 /* Wait 100ms for interrupt. */
7273 EndTime = jiffies + msecs_to_jiffies(100);
7276 if (time_after(jiffies, EndTime)) {
7281 spin_lock_irqsave(&info->irq_spinlock,flags);
7282 status = usc_InDmaReg( info, RDMR );
7283 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7285 if ( !(status & BIT4) && (status & BIT5) ) {
7286 /* INITG (BIT 4) is inactive (no entry read in progress) AND */
7287 /* BUSY (BIT 5) is active (channel still active). */
7288 /* This means the buffer entry read has completed. */
7294 /******************************/
7295 /* Program 16C32 transmitter. */
7296 /******************************/
7298 spin_lock_irqsave(&info->irq_spinlock,flags);
7300 /* Program the Transmit Character Length Register (TCLR) */
7301 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
7303 usc_OutReg( info, TCLR, (unsigned short)info->tx_buffer_list[0].count );
7304 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7306 /* Program the address of the 1st DMA Buffer Entry in linked list */
7308 phys_addr = info->tx_buffer_list[0].phys_entry;
7309 usc_OutDmaReg( info, NTARL, (unsigned short)phys_addr );
7310 usc_OutDmaReg( info, NTARU, (unsigned short)(phys_addr >> 16) );
7312 /* unlatch Tx status bits, and start transmit channel. */
7314 usc_OutReg( info, TCSR, (unsigned short)(( usc_InReg(info, TCSR) & 0x0f00) | 0xfa) );
7315 usc_DmaCmd( info, DmaCmd_InitTxChannel );
7317 /* wait for DMA controller to fill transmit FIFO */
7319 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
7321 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7324 /**********************************/
7325 /* WAIT FOR TRANSMIT FIFO TO FILL */
7326 /**********************************/
7329 EndTime = jiffies + msecs_to_jiffies(100);
7332 if (time_after(jiffies, EndTime)) {
7337 spin_lock_irqsave(&info->irq_spinlock,flags);
7338 FifoLevel = usc_InReg(info, TICR) >> 8;
7339 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7341 if ( FifoLevel < 16 )
7344 if ( FrameSize < 32 ) {
7345 /* This frame is smaller than the entire transmit FIFO */
7346 /* so wait for the entire frame to be loaded. */
7347 if ( FifoLevel <= (32 - FrameSize) )
7355 /* Enable 16C32 transmitter. */
7357 spin_lock_irqsave(&info->irq_spinlock,flags);
7359 /* Transmit mode Register (TMR), <1..0> = 10, Enable Transmitter */
7360 usc_TCmd( info, TCmd_SendFrame );
7361 usc_OutReg( info, TMR, (unsigned short)((usc_InReg(info, TMR) & 0xfffc) | 0x0002) );
7363 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7366 /******************************/
7367 /* WAIT FOR TRANSMIT COMPLETE */
7368 /******************************/
7371 EndTime = jiffies + msecs_to_jiffies(100);
7373 /* While timer not expired wait for transmit complete */
7375 spin_lock_irqsave(&info->irq_spinlock,flags);
7376 status = usc_InReg( info, TCSR );
7377 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7379 while ( !(status & (BIT6+BIT5+BIT4+BIT2+BIT1)) ) {
7380 if (time_after(jiffies, EndTime)) {
7385 spin_lock_irqsave(&info->irq_spinlock,flags);
7386 status = usc_InReg( info, TCSR );
7387 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7393 /* CHECK FOR TRANSMIT ERRORS */
7394 if ( status & (BIT5 + BIT1) )
7399 /* WAIT FOR RECEIVE COMPLETE */
7402 EndTime = jiffies + msecs_to_jiffies(100);
7404 /* Wait for 16C32 to write receive status to buffer entry. */
7405 status=info->rx_buffer_list[0].status;
7406 while ( status == 0 ) {
7407 if (time_after(jiffies, EndTime)) {
7411 status=info->rx_buffer_list[0].status;
7417 /* CHECK FOR RECEIVE ERRORS */
7418 status = info->rx_buffer_list[0].status;
7420 if ( status & (BIT8 + BIT3 + BIT1) ) {
7421 /* receive error has occurred */
7424 if ( memcmp( info->tx_buffer_list[0].virt_addr ,
7425 info->rx_buffer_list[0].virt_addr, FrameSize ) ){
7431 spin_lock_irqsave(&info->irq_spinlock,flags);
7433 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7435 /* restore current port options */
7436 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
7440 } /* end of mgsl_dma_test() */
7442 /* mgsl_adapter_test()
7444 * Perform the register, IRQ, and DMA tests for the 16C32.
7446 * Arguments: info pointer to device instance data
7447 * Return Value: 0 if success, otherwise -ENODEV
7449 static int mgsl_adapter_test( struct mgsl_struct *info )
7451 if ( debug_level >= DEBUG_LEVEL_INFO )
7452 printk( "%s(%d):Testing device %s\n",
7453 __FILE__,__LINE__,info->device_name );
7455 if ( !mgsl_register_test( info ) ) {
7456 info->init_error = DiagStatus_AddressFailure;
7457 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
7458 __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
7462 if ( !mgsl_irq_test( info ) ) {
7463 info->init_error = DiagStatus_IrqFailure;
7464 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
7465 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
7469 if ( !mgsl_dma_test( info ) ) {
7470 info->init_error = DiagStatus_DmaFailure;
7471 printk( "%s(%d):DMA test failure for device %s DMA=%d\n",
7472 __FILE__,__LINE__,info->device_name, (unsigned short)(info->dma_level) );
7476 if ( debug_level >= DEBUG_LEVEL_INFO )
7477 printk( "%s(%d):device %s passed diagnostics\n",
7478 __FILE__,__LINE__,info->device_name );
7482 } /* end of mgsl_adapter_test() */
7484 /* mgsl_memory_test()
7486 * Test the shared memory on a PCI adapter.
7488 * Arguments: info pointer to device instance data
7489 * Return Value: TRUE if test passed, otherwise FALSE
7491 static BOOLEAN mgsl_memory_test( struct mgsl_struct *info )
7493 static unsigned long BitPatterns[] =
7494 { 0x0, 0x55555555, 0xaaaaaaaa, 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
7495 unsigned long Patterncount = ARRAY_SIZE(BitPatterns);
7497 unsigned long TestLimit = SHARED_MEM_ADDRESS_SIZE/sizeof(unsigned long);
7498 unsigned long * TestAddr;
7500 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
7503 TestAddr = (unsigned long *)info->memory_base;
7505 /* Test data lines with test pattern at one location. */
7507 for ( i = 0 ; i < Patterncount ; i++ ) {
7508 *TestAddr = BitPatterns[i];
7509 if ( *TestAddr != BitPatterns[i] )
7513 /* Test address lines with incrementing pattern over */
7514 /* entire address range. */
7516 for ( i = 0 ; i < TestLimit ; i++ ) {
7521 TestAddr = (unsigned long *)info->memory_base;
7523 for ( i = 0 ; i < TestLimit ; i++ ) {
7524 if ( *TestAddr != i * 4 )
7529 memset( info->memory_base, 0, SHARED_MEM_ADDRESS_SIZE );
7533 } /* End Of mgsl_memory_test() */
7536 /* mgsl_load_pci_memory()
7538 * Load a large block of data into the PCI shared memory.
7539 * Use this instead of memcpy() or memmove() to move data
7540 * into the PCI shared memory.
7544 * This function prevents the PCI9050 interface chip from hogging
7545 * the adapter local bus, which can starve the 16C32 by preventing
7546 * 16C32 bus master cycles.
7548 * The PCI9050 documentation says that the 9050 will always release
7549 * control of the local bus after completing the current read
7550 * or write operation.
7552 * It appears that as long as the PCI9050 write FIFO is full, the
7553 * PCI9050 treats all of the writes as a single burst transaction
7554 * and will not release the bus. This causes DMA latency problems
7555 * at high speeds when copying large data blocks to the shared
7558 * This function in effect, breaks the a large shared memory write
7559 * into multiple transations by interleaving a shared memory read
7560 * which will flush the write FIFO and 'complete' the write
7561 * transation. This allows any pending DMA request to gain control
7562 * of the local bus in a timely fasion.
7566 * TargetPtr pointer to target address in PCI shared memory
7567 * SourcePtr pointer to source buffer for data
7568 * count count in bytes of data to copy
7570 * Return Value: None
7572 static void mgsl_load_pci_memory( char* TargetPtr, const char* SourcePtr,
7573 unsigned short count )
7575 /* 16 32-bit writes @ 60ns each = 960ns max latency on local bus */
7576 #define PCI_LOAD_INTERVAL 64
7578 unsigned short Intervalcount = count / PCI_LOAD_INTERVAL;
7579 unsigned short Index;
7580 unsigned long Dummy;
7582 for ( Index = 0 ; Index < Intervalcount ; Index++ )
7584 memcpy(TargetPtr, SourcePtr, PCI_LOAD_INTERVAL);
7585 Dummy = *((volatile unsigned long *)TargetPtr);
7586 TargetPtr += PCI_LOAD_INTERVAL;
7587 SourcePtr += PCI_LOAD_INTERVAL;
7590 memcpy( TargetPtr, SourcePtr, count % PCI_LOAD_INTERVAL );
7592 } /* End Of mgsl_load_pci_memory() */
7594 static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit)
7599 printk("%s tx data:\n",info->device_name);
7601 printk("%s rx data:\n",info->device_name);
7609 for(i=0;i<linecount;i++)
7610 printk("%02X ",(unsigned char)data[i]);
7613 for(i=0;i<linecount;i++) {
7614 if (data[i]>=040 && data[i]<=0176)
7615 printk("%c",data[i]);
7624 } /* end of mgsl_trace_block() */
7626 /* mgsl_tx_timeout()
7628 * called when HDLC frame times out
7629 * update stats and do tx completion processing
7631 * Arguments: context pointer to device instance data
7632 * Return Value: None
7634 static void mgsl_tx_timeout(unsigned long context)
7636 struct mgsl_struct *info = (struct mgsl_struct*)context;
7637 unsigned long flags;
7639 if ( debug_level >= DEBUG_LEVEL_INFO )
7640 printk( "%s(%d):mgsl_tx_timeout(%s)\n",
7641 __FILE__,__LINE__,info->device_name);
7642 if(info->tx_active &&
7643 (info->params.mode == MGSL_MODE_HDLC ||
7644 info->params.mode == MGSL_MODE_RAW) ) {
7645 info->icount.txtimeout++;
7647 spin_lock_irqsave(&info->irq_spinlock,flags);
7648 info->tx_active = 0;
7649 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
7651 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
7652 usc_loopmode_cancel_transmit( info );
7654 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7658 hdlcdev_tx_done(info);
7661 mgsl_bh_transmit(info);
7663 } /* end of mgsl_tx_timeout() */
7665 /* signal that there are no more frames to send, so that
7666 * line is 'released' by echoing RxD to TxD when current
7667 * transmission is complete (or immediately if no tx in progress).
7669 static int mgsl_loopmode_send_done( struct mgsl_struct * info )
7671 unsigned long flags;
7673 spin_lock_irqsave(&info->irq_spinlock,flags);
7674 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
7675 if (info->tx_active)
7676 info->loopmode_send_done_requested = TRUE;
7678 usc_loopmode_send_done(info);
7680 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7685 /* release the line by echoing RxD to TxD
7686 * upon completion of a transmit frame
7688 static void usc_loopmode_send_done( struct mgsl_struct * info )
7690 info->loopmode_send_done_requested = FALSE;
7691 /* clear CMR:13 to 0 to start echoing RxData to TxData */
7692 info->cmr_value &= ~BIT13;
7693 usc_OutReg(info, CMR, info->cmr_value);
7696 /* abort a transmit in progress while in HDLC LoopMode
7698 static void usc_loopmode_cancel_transmit( struct mgsl_struct * info )
7700 /* reset tx dma channel and purge TxFifo */
7701 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7702 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
7703 usc_loopmode_send_done( info );
7706 /* for HDLC/SDLC LoopMode, setting CMR:13 after the transmitter is enabled
7707 * is an Insert Into Loop action. Upon receipt of a GoAhead sequence (RxAbort)
7708 * we must clear CMR:13 to begin repeating TxData to RxData
7710 static void usc_loopmode_insert_request( struct mgsl_struct * info )
7712 info->loopmode_insert_requested = TRUE;
7714 /* enable RxAbort irq. On next RxAbort, clear CMR:13 to
7715 * begin repeating TxData on RxData (complete insertion)
7717 usc_OutReg( info, RICR,
7718 (usc_InReg( info, RICR ) | RXSTATUS_ABORT_RECEIVED ) );
7720 /* set CMR:13 to insert into loop on next GoAhead (RxAbort) */
7721 info->cmr_value |= BIT13;
7722 usc_OutReg(info, CMR, info->cmr_value);
7725 /* return 1 if station is inserted into the loop, otherwise 0
7727 static int usc_loopmode_active( struct mgsl_struct * info)
7729 return usc_InReg( info, CCSR ) & BIT7 ? 1 : 0 ;
7735 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
7736 * set encoding and frame check sequence (FCS) options
7738 * dev pointer to network device structure
7739 * encoding serial encoding setting
7740 * parity FCS setting
7742 * returns 0 if success, otherwise error code
7744 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
7745 unsigned short parity)
7747 struct mgsl_struct *info = dev_to_port(dev);
7748 unsigned char new_encoding;
7749 unsigned short new_crctype;
7751 /* return error if TTY interface open */
7757 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
7758 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
7759 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
7760 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
7761 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
7762 default: return -EINVAL;
7767 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
7768 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
7769 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
7770 default: return -EINVAL;
7773 info->params.encoding = new_encoding;
7774 info->params.crc_type = new_crctype;;
7776 /* if network interface up, reprogram hardware */
7778 mgsl_program_hw(info);
7784 * called by generic HDLC layer to send frame
7786 * skb socket buffer containing HDLC frame
7787 * dev pointer to network device structure
7789 * returns 0 if success, otherwise error code
7791 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
7793 struct mgsl_struct *info = dev_to_port(dev);
7794 struct net_device_stats *stats = hdlc_stats(dev);
7795 unsigned long flags;
7797 if (debug_level >= DEBUG_LEVEL_INFO)
7798 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
7800 /* stop sending until this frame completes */
7801 netif_stop_queue(dev);
7803 /* copy data to device buffers */
7804 info->xmit_cnt = skb->len;
7805 mgsl_load_tx_dma_buffer(info, skb->data, skb->len);
7807 /* update network statistics */
7808 stats->tx_packets++;
7809 stats->tx_bytes += skb->len;
7811 /* done with socket buffer, so free it */
7814 /* save start time for transmit timeout detection */
7815 dev->trans_start = jiffies;
7817 /* start hardware transmitter if necessary */
7818 spin_lock_irqsave(&info->irq_spinlock,flags);
7819 if (!info->tx_active)
7820 usc_start_transmitter(info);
7821 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7827 * called by network layer when interface enabled
7828 * claim resources and initialize hardware
7830 * dev pointer to network device structure
7832 * returns 0 if success, otherwise error code
7834 static int hdlcdev_open(struct net_device *dev)
7836 struct mgsl_struct *info = dev_to_port(dev);
7838 unsigned long flags;
7840 if (debug_level >= DEBUG_LEVEL_INFO)
7841 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
7843 /* generic HDLC layer open processing */
7844 if ((rc = hdlc_open(dev)))
7847 /* arbitrate between network and tty opens */
7848 spin_lock_irqsave(&info->netlock, flags);
7849 if (info->count != 0 || info->netcount != 0) {
7850 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
7851 spin_unlock_irqrestore(&info->netlock, flags);
7855 spin_unlock_irqrestore(&info->netlock, flags);
7857 /* claim resources and init adapter */
7858 if ((rc = startup(info)) != 0) {
7859 spin_lock_irqsave(&info->netlock, flags);
7861 spin_unlock_irqrestore(&info->netlock, flags);
7865 /* assert DTR and RTS, apply hardware settings */
7866 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
7867 mgsl_program_hw(info);
7869 /* enable network layer transmit */
7870 dev->trans_start = jiffies;
7871 netif_start_queue(dev);
7873 /* inform generic HDLC layer of current DCD status */
7874 spin_lock_irqsave(&info->irq_spinlock, flags);
7875 usc_get_serial_signals(info);
7876 spin_unlock_irqrestore(&info->irq_spinlock, flags);
7877 hdlc_set_carrier(info->serial_signals & SerialSignal_DCD, dev);
7883 * called by network layer when interface is disabled
7884 * shutdown hardware and release resources
7886 * dev pointer to network device structure
7888 * returns 0 if success, otherwise error code
7890 static int hdlcdev_close(struct net_device *dev)
7892 struct mgsl_struct *info = dev_to_port(dev);
7893 unsigned long flags;
7895 if (debug_level >= DEBUG_LEVEL_INFO)
7896 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
7898 netif_stop_queue(dev);
7900 /* shutdown adapter and release resources */
7905 spin_lock_irqsave(&info->netlock, flags);
7907 spin_unlock_irqrestore(&info->netlock, flags);
7913 * called by network layer to process IOCTL call to network device
7915 * dev pointer to network device structure
7916 * ifr pointer to network interface request structure
7917 * cmd IOCTL command code
7919 * returns 0 if success, otherwise error code
7921 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
7923 const size_t size = sizeof(sync_serial_settings);
7924 sync_serial_settings new_line;
7925 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
7926 struct mgsl_struct *info = dev_to_port(dev);
7929 if (debug_level >= DEBUG_LEVEL_INFO)
7930 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
7932 /* return error if TTY interface open */
7936 if (cmd != SIOCWANDEV)
7937 return hdlc_ioctl(dev, ifr, cmd);
7939 switch(ifr->ifr_settings.type) {
7940 case IF_GET_IFACE: /* return current sync_serial_settings */
7942 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
7943 if (ifr->ifr_settings.size < size) {
7944 ifr->ifr_settings.size = size; /* data size wanted */
7948 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7949 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7950 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7951 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7954 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
7955 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
7956 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
7957 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
7958 default: new_line.clock_type = CLOCK_DEFAULT;
7961 new_line.clock_rate = info->params.clock_speed;
7962 new_line.loopback = info->params.loopback ? 1:0;
7964 if (copy_to_user(line, &new_line, size))
7968 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
7970 if(!capable(CAP_NET_ADMIN))
7972 if (copy_from_user(&new_line, line, size))
7975 switch (new_line.clock_type)
7977 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
7978 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
7979 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
7980 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
7981 case CLOCK_DEFAULT: flags = info->params.flags &
7982 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7983 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7984 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7985 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
7986 default: return -EINVAL;
7989 if (new_line.loopback != 0 && new_line.loopback != 1)
7992 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7993 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7994 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7995 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7996 info->params.flags |= flags;
7998 info->params.loopback = new_line.loopback;
8000 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
8001 info->params.clock_speed = new_line.clock_rate;
8003 info->params.clock_speed = 0;
8005 /* if network interface up, reprogram hardware */
8007 mgsl_program_hw(info);
8011 return hdlc_ioctl(dev, ifr, cmd);
8016 * called by network layer when transmit timeout is detected
8018 * dev pointer to network device structure
8020 static void hdlcdev_tx_timeout(struct net_device *dev)
8022 struct mgsl_struct *info = dev_to_port(dev);
8023 struct net_device_stats *stats = hdlc_stats(dev);
8024 unsigned long flags;
8026 if (debug_level >= DEBUG_LEVEL_INFO)
8027 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
8030 stats->tx_aborted_errors++;
8032 spin_lock_irqsave(&info->irq_spinlock,flags);
8033 usc_stop_transmitter(info);
8034 spin_unlock_irqrestore(&info->irq_spinlock,flags);
8036 netif_wake_queue(dev);
8040 * called by device driver when transmit completes
8041 * reenable network layer transmit if stopped
8043 * info pointer to device instance information
8045 static void hdlcdev_tx_done(struct mgsl_struct *info)
8047 if (netif_queue_stopped(info->netdev))
8048 netif_wake_queue(info->netdev);
8052 * called by device driver when frame received
8053 * pass frame to network layer
8055 * info pointer to device instance information
8056 * buf pointer to buffer contianing frame data
8057 * size count of data bytes in buf
8059 static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size)
8061 struct sk_buff *skb = dev_alloc_skb(size);
8062 struct net_device *dev = info->netdev;
8063 struct net_device_stats *stats = hdlc_stats(dev);
8065 if (debug_level >= DEBUG_LEVEL_INFO)
8066 printk("hdlcdev_rx(%s)\n",dev->name);
8069 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
8070 stats->rx_dropped++;
8074 memcpy(skb_put(skb, size),buf,size);
8076 skb->protocol = hdlc_type_trans(skb, info->netdev);
8078 stats->rx_packets++;
8079 stats->rx_bytes += size;
8083 info->netdev->last_rx = jiffies;
8087 * called by device driver when adding device instance
8088 * do generic HDLC initialization
8090 * info pointer to device instance information
8092 * returns 0 if success, otherwise error code
8094 static int hdlcdev_init(struct mgsl_struct *info)
8097 struct net_device *dev;
8100 /* allocate and initialize network and HDLC layer objects */
8102 if (!(dev = alloc_hdlcdev(info))) {
8103 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
8107 /* for network layer reporting purposes only */
8108 dev->base_addr = info->io_base;
8109 dev->irq = info->irq_level;
8110 dev->dma = info->dma_level;
8112 /* network layer callbacks and settings */
8113 dev->do_ioctl = hdlcdev_ioctl;
8114 dev->open = hdlcdev_open;
8115 dev->stop = hdlcdev_close;
8116 dev->tx_timeout = hdlcdev_tx_timeout;
8117 dev->watchdog_timeo = 10*HZ;
8118 dev->tx_queue_len = 50;
8120 /* generic HDLC layer callbacks and settings */
8121 hdlc = dev_to_hdlc(dev);
8122 hdlc->attach = hdlcdev_attach;
8123 hdlc->xmit = hdlcdev_xmit;
8125 /* register objects with HDLC layer */
8126 if ((rc = register_hdlc_device(dev))) {
8127 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
8137 * called by device driver when removing device instance
8138 * do generic HDLC cleanup
8140 * info pointer to device instance information
8142 static void hdlcdev_exit(struct mgsl_struct *info)
8144 unregister_hdlc_device(info->netdev);
8145 free_netdev(info->netdev);
8146 info->netdev = NULL;
8149 #endif /* CONFIG_HDLC */
8152 static int __devinit synclink_init_one (struct pci_dev *dev,
8153 const struct pci_device_id *ent)
8155 struct mgsl_struct *info;
8157 if (pci_enable_device(dev)) {
8158 printk("error enabling pci device %p\n", dev);
8162 if (!(info = mgsl_allocate_device())) {
8163 printk("can't allocate device instance data.\n");
8167 /* Copy user configuration info to device instance data */
8169 info->io_base = pci_resource_start(dev, 2);
8170 info->irq_level = dev->irq;
8171 info->phys_memory_base = pci_resource_start(dev, 3);
8173 /* Because veremap only works on page boundaries we must map
8174 * a larger area than is actually implemented for the LCR
8175 * memory range. We map a full page starting at the page boundary.
8177 info->phys_lcr_base = pci_resource_start(dev, 0);
8178 info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
8179 info->phys_lcr_base &= ~(PAGE_SIZE-1);
8181 info->bus_type = MGSL_BUS_TYPE_PCI;
8182 info->io_addr_size = 8;
8183 info->irq_flags = SA_SHIRQ;
8185 if (dev->device == 0x0210) {
8186 /* Version 1 PCI9030 based universal PCI adapter */
8187 info->misc_ctrl_value = 0x007c4080;
8188 info->hw_version = 1;
8190 /* Version 0 PCI9050 based 5V PCI adapter
8191 * A PCI9050 bug prevents reading LCR registers if
8192 * LCR base address bit 7 is set. Maintain shadow
8193 * value so we can write to LCR misc control reg.
8195 info->misc_ctrl_value = 0x087e4546;
8196 info->hw_version = 0;
8199 mgsl_add_device(info);
8204 static void __devexit synclink_remove_one (struct pci_dev *dev)