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/module.h>
67 #include <linux/errno.h>
68 #include <linux/signal.h>
69 #include <linux/sched.h>
70 #include <linux/timer.h>
71 #include <linux/interrupt.h>
72 #include <linux/pci.h>
73 #include <linux/tty.h>
74 #include <linux/tty_flip.h>
75 #include <linux/serial.h>
76 #include <linux/major.h>
77 #include <linux/string.h>
78 #include <linux/fcntl.h>
79 #include <linux/ptrace.h>
80 #include <linux/ioport.h>
82 #include <linux/slab.h>
83 #include <linux/delay.h>
84 #include <linux/netdevice.h>
85 #include <linux/vmalloc.h>
86 #include <linux/init.h>
87 #include <linux/ioctl.h>
88 #include <linux/synclink.h>
90 #include <asm/system.h>
94 #include <linux/bitops.h>
95 #include <asm/types.h>
96 #include <linux/termios.h>
97 #include <linux/workqueue.h>
98 #include <linux/hdlc.h>
99 #include <linux/dma-mapping.h>
101 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_MODULE))
102 #define SYNCLINK_GENERIC_HDLC 1
104 #define SYNCLINK_GENERIC_HDLC 0
107 #define GET_USER(error,value,addr) error = get_user(value,addr)
108 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
109 #define PUT_USER(error,value,addr) error = put_user(value,addr)
110 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
112 #include <asm/uaccess.h>
114 #define RCLRVALUE 0xffff
116 static MGSL_PARAMS default_params = {
117 MGSL_MODE_HDLC, /* unsigned long mode */
118 0, /* unsigned char loopback; */
119 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
120 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
121 0, /* unsigned long clock_speed; */
122 0xff, /* unsigned char addr_filter; */
123 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
124 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
125 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
126 9600, /* unsigned long data_rate; */
127 8, /* unsigned char data_bits; */
128 1, /* unsigned char stop_bits; */
129 ASYNC_PARITY_NONE /* unsigned char parity; */
132 #define SHARED_MEM_ADDRESS_SIZE 0x40000
133 #define BUFFERLISTSIZE 4096
134 #define DMABUFFERSIZE 4096
135 #define MAXRXFRAMES 7
137 typedef struct _DMABUFFERENTRY
139 u32 phys_addr; /* 32-bit flat physical address of data buffer */
140 volatile u16 count; /* buffer size/data count */
141 volatile u16 status; /* Control/status field */
142 volatile u16 rcc; /* character count field */
143 u16 reserved; /* padding required by 16C32 */
144 u32 link; /* 32-bit flat link to next buffer entry */
145 char *virt_addr; /* virtual address of data buffer */
146 u32 phys_entry; /* physical address of this buffer entry */
148 } DMABUFFERENTRY, *DMAPBUFFERENTRY;
150 /* The queue of BH actions to be performed */
153 #define BH_TRANSMIT 2
156 #define IO_PIN_SHUTDOWN_LIMIT 100
158 struct _input_signal_events {
169 /* transmit holding buffer definitions*/
170 #define MAX_TX_HOLDING_BUFFERS 5
171 struct tx_holding_buffer {
173 unsigned char * buffer;
178 * Device instance data structure
184 int count; /* count of opens */
187 unsigned short close_delay;
188 unsigned short closing_wait; /* time to wait before closing */
190 struct mgsl_icount icount;
192 struct tty_struct *tty;
194 int x_char; /* xon/xoff character */
195 int blocked_open; /* # of blocked opens */
196 u16 read_status_mask;
197 u16 ignore_status_mask;
198 unsigned char *xmit_buf;
203 wait_queue_head_t open_wait;
204 wait_queue_head_t close_wait;
206 wait_queue_head_t status_event_wait_q;
207 wait_queue_head_t event_wait_q;
208 struct timer_list tx_timer; /* HDLC transmit timeout timer */
209 struct mgsl_struct *next_device; /* device list link */
211 spinlock_t irq_spinlock; /* spinlock for synchronizing with ISR */
212 struct work_struct task; /* task structure for scheduling bh */
214 u32 EventMask; /* event trigger mask */
215 u32 RecordedEvents; /* pending events */
217 u32 max_frame_size; /* as set by device config */
221 bool bh_running; /* Protection from multiple */
225 int dcd_chkcount; /* check counts to prevent */
226 int cts_chkcount; /* too many IRQs if a signal */
227 int dsr_chkcount; /* is floating */
230 char *buffer_list; /* virtual address of Rx & Tx buffer lists */
231 u32 buffer_list_phys;
232 dma_addr_t buffer_list_dma_addr;
234 unsigned int rx_buffer_count; /* count of total allocated Rx buffers */
235 DMABUFFERENTRY *rx_buffer_list; /* list of receive buffer entries */
236 unsigned int current_rx_buffer;
238 int num_tx_dma_buffers; /* number of tx dma frames required */
239 int tx_dma_buffers_used;
240 unsigned int tx_buffer_count; /* count of total allocated Tx buffers */
241 DMABUFFERENTRY *tx_buffer_list; /* list of transmit buffer entries */
242 int start_tx_dma_buffer; /* tx dma buffer to start tx dma operation */
243 int current_tx_buffer; /* next tx dma buffer to be loaded */
245 unsigned char *intermediate_rxbuffer;
247 int num_tx_holding_buffers; /* number of tx holding buffer allocated */
248 int get_tx_holding_index; /* next tx holding buffer for adapter to load */
249 int put_tx_holding_index; /* next tx holding buffer to store user request */
250 int tx_holding_count; /* number of tx holding buffers waiting */
251 struct tx_holding_buffer tx_holding_buffers[MAX_TX_HOLDING_BUFFERS];
255 bool rx_rcc_underrun;
264 char device_name[25]; /* device instance name */
266 unsigned int bus_type; /* expansion bus type (ISA,EISA,PCI) */
267 unsigned char bus; /* expansion bus number (zero based) */
268 unsigned char function; /* PCI device number */
270 unsigned int io_base; /* base I/O address of adapter */
271 unsigned int io_addr_size; /* size of the I/O address range */
272 bool io_addr_requested; /* true if I/O address requested */
274 unsigned int irq_level; /* interrupt level */
275 unsigned long irq_flags;
276 bool irq_requested; /* true if IRQ requested */
278 unsigned int dma_level; /* DMA channel */
279 bool dma_requested; /* true if dma channel requested */
285 MGSL_PARAMS params; /* communications parameters */
287 unsigned char serial_signals; /* current serial signal states */
289 bool irq_occurred; /* for diagnostics use */
290 unsigned int init_error; /* Initialization startup error (DIAGS) */
291 int fDiagnosticsmode; /* Driver in Diagnostic mode? (DIAGS) */
294 unsigned char* memory_base; /* shared memory address (PCI only) */
295 u32 phys_memory_base;
296 bool shared_mem_requested;
298 unsigned char* lcr_base; /* local config registers (PCI only) */
301 bool lcr_mem_requested;
304 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
305 char char_buf[MAX_ASYNC_BUFFER_SIZE];
306 bool drop_rts_on_tx_done;
308 bool loopmode_insert_requested;
309 bool loopmode_send_done_requested;
311 struct _input_signal_events input_signal_events;
313 /* generic HDLC device parts */
318 #if SYNCLINK_GENERIC_HDLC
319 struct net_device *netdev;
323 #define MGSL_MAGIC 0x5401
326 * The size of the serial xmit buffer is 1 page, or 4096 bytes
328 #ifndef SERIAL_XMIT_SIZE
329 #define SERIAL_XMIT_SIZE 4096
333 * These macros define the offsets used in calculating the
334 * I/O address of the specified USC registers.
338 #define DCPIN 2 /* Bit 1 of I/O address */
339 #define SDPIN 4 /* Bit 2 of I/O address */
341 #define DCAR 0 /* DMA command/address register */
342 #define CCAR SDPIN /* channel command/address register */
343 #define DATAREG DCPIN + SDPIN /* serial data register */
348 * These macros define the register address (ordinal number)
349 * used for writing address/value pairs to the USC.
352 #define CMR 0x02 /* Channel mode Register */
353 #define CCSR 0x04 /* Channel Command/status Register */
354 #define CCR 0x06 /* Channel Control Register */
355 #define PSR 0x08 /* Port status Register */
356 #define PCR 0x0a /* Port Control Register */
357 #define TMDR 0x0c /* Test mode Data Register */
358 #define TMCR 0x0e /* Test mode Control Register */
359 #define CMCR 0x10 /* Clock mode Control Register */
360 #define HCR 0x12 /* Hardware Configuration Register */
361 #define IVR 0x14 /* Interrupt Vector Register */
362 #define IOCR 0x16 /* Input/Output Control Register */
363 #define ICR 0x18 /* Interrupt Control Register */
364 #define DCCR 0x1a /* Daisy Chain Control Register */
365 #define MISR 0x1c /* Misc Interrupt status Register */
366 #define SICR 0x1e /* status Interrupt Control Register */
367 #define RDR 0x20 /* Receive Data Register */
368 #define RMR 0x22 /* Receive mode Register */
369 #define RCSR 0x24 /* Receive Command/status Register */
370 #define RICR 0x26 /* Receive Interrupt Control Register */
371 #define RSR 0x28 /* Receive Sync Register */
372 #define RCLR 0x2a /* Receive count Limit Register */
373 #define RCCR 0x2c /* Receive Character count Register */
374 #define TC0R 0x2e /* Time Constant 0 Register */
375 #define TDR 0x30 /* Transmit Data Register */
376 #define TMR 0x32 /* Transmit mode Register */
377 #define TCSR 0x34 /* Transmit Command/status Register */
378 #define TICR 0x36 /* Transmit Interrupt Control Register */
379 #define TSR 0x38 /* Transmit Sync Register */
380 #define TCLR 0x3a /* Transmit count Limit Register */
381 #define TCCR 0x3c /* Transmit Character count Register */
382 #define TC1R 0x3e /* Time Constant 1 Register */
386 * MACRO DEFINITIONS FOR DMA REGISTERS
389 #define DCR 0x06 /* DMA Control Register (shared) */
390 #define DACR 0x08 /* DMA Array count Register (shared) */
391 #define BDCR 0x12 /* Burst/Dwell Control Register (shared) */
392 #define DIVR 0x14 /* DMA Interrupt Vector Register (shared) */
393 #define DICR 0x18 /* DMA Interrupt Control Register (shared) */
394 #define CDIR 0x1a /* Clear DMA Interrupt Register (shared) */
395 #define SDIR 0x1c /* Set DMA Interrupt Register (shared) */
397 #define TDMR 0x02 /* Transmit DMA mode Register */
398 #define TDIAR 0x1e /* Transmit DMA Interrupt Arm Register */
399 #define TBCR 0x2a /* Transmit Byte count Register */
400 #define TARL 0x2c /* Transmit Address Register (low) */
401 #define TARU 0x2e /* Transmit Address Register (high) */
402 #define NTBCR 0x3a /* Next Transmit Byte count Register */
403 #define NTARL 0x3c /* Next Transmit Address Register (low) */
404 #define NTARU 0x3e /* Next Transmit Address Register (high) */
406 #define RDMR 0x82 /* Receive DMA mode Register (non-shared) */
407 #define RDIAR 0x9e /* Receive DMA Interrupt Arm Register */
408 #define RBCR 0xaa /* Receive Byte count Register */
409 #define RARL 0xac /* Receive Address Register (low) */
410 #define RARU 0xae /* Receive Address Register (high) */
411 #define NRBCR 0xba /* Next Receive Byte count Register */
412 #define NRARL 0xbc /* Next Receive Address Register (low) */
413 #define NRARU 0xbe /* Next Receive Address Register (high) */
417 * MACRO DEFINITIONS FOR MODEM STATUS BITS
420 #define MODEMSTATUS_DTR 0x80
421 #define MODEMSTATUS_DSR 0x40
422 #define MODEMSTATUS_RTS 0x20
423 #define MODEMSTATUS_CTS 0x10
424 #define MODEMSTATUS_RI 0x04
425 #define MODEMSTATUS_DCD 0x01
429 * Channel Command/Address Register (CCAR) Command Codes
432 #define RTCmd_Null 0x0000
433 #define RTCmd_ResetHighestIus 0x1000
434 #define RTCmd_TriggerChannelLoadDma 0x2000
435 #define RTCmd_TriggerRxDma 0x2800
436 #define RTCmd_TriggerTxDma 0x3000
437 #define RTCmd_TriggerRxAndTxDma 0x3800
438 #define RTCmd_PurgeRxFifo 0x4800
439 #define RTCmd_PurgeTxFifo 0x5000
440 #define RTCmd_PurgeRxAndTxFifo 0x5800
441 #define RTCmd_LoadRcc 0x6800
442 #define RTCmd_LoadTcc 0x7000
443 #define RTCmd_LoadRccAndTcc 0x7800
444 #define RTCmd_LoadTC0 0x8800
445 #define RTCmd_LoadTC1 0x9000
446 #define RTCmd_LoadTC0AndTC1 0x9800
447 #define RTCmd_SerialDataLSBFirst 0xa000
448 #define RTCmd_SerialDataMSBFirst 0xa800
449 #define RTCmd_SelectBigEndian 0xb000
450 #define RTCmd_SelectLittleEndian 0xb800
454 * DMA Command/Address Register (DCAR) Command Codes
457 #define DmaCmd_Null 0x0000
458 #define DmaCmd_ResetTxChannel 0x1000
459 #define DmaCmd_ResetRxChannel 0x1200
460 #define DmaCmd_StartTxChannel 0x2000
461 #define DmaCmd_StartRxChannel 0x2200
462 #define DmaCmd_ContinueTxChannel 0x3000
463 #define DmaCmd_ContinueRxChannel 0x3200
464 #define DmaCmd_PauseTxChannel 0x4000
465 #define DmaCmd_PauseRxChannel 0x4200
466 #define DmaCmd_AbortTxChannel 0x5000
467 #define DmaCmd_AbortRxChannel 0x5200
468 #define DmaCmd_InitTxChannel 0x7000
469 #define DmaCmd_InitRxChannel 0x7200
470 #define DmaCmd_ResetHighestDmaIus 0x8000
471 #define DmaCmd_ResetAllChannels 0x9000
472 #define DmaCmd_StartAllChannels 0xa000
473 #define DmaCmd_ContinueAllChannels 0xb000
474 #define DmaCmd_PauseAllChannels 0xc000
475 #define DmaCmd_AbortAllChannels 0xd000
476 #define DmaCmd_InitAllChannels 0xf000
478 #define TCmd_Null 0x0000
479 #define TCmd_ClearTxCRC 0x2000
480 #define TCmd_SelectTicrTtsaData 0x4000
481 #define TCmd_SelectTicrTxFifostatus 0x5000
482 #define TCmd_SelectTicrIntLevel 0x6000
483 #define TCmd_SelectTicrdma_level 0x7000
484 #define TCmd_SendFrame 0x8000
485 #define TCmd_SendAbort 0x9000
486 #define TCmd_EnableDleInsertion 0xc000
487 #define TCmd_DisableDleInsertion 0xd000
488 #define TCmd_ClearEofEom 0xe000
489 #define TCmd_SetEofEom 0xf000
491 #define RCmd_Null 0x0000
492 #define RCmd_ClearRxCRC 0x2000
493 #define RCmd_EnterHuntmode 0x3000
494 #define RCmd_SelectRicrRtsaData 0x4000
495 #define RCmd_SelectRicrRxFifostatus 0x5000
496 #define RCmd_SelectRicrIntLevel 0x6000
497 #define RCmd_SelectRicrdma_level 0x7000
500 * Bits for enabling and disabling IRQs in Interrupt Control Register (ICR)
503 #define RECEIVE_STATUS BIT5
504 #define RECEIVE_DATA BIT4
505 #define TRANSMIT_STATUS BIT3
506 #define TRANSMIT_DATA BIT2
512 * Receive status Bits in Receive Command/status Register RCSR
515 #define RXSTATUS_SHORT_FRAME BIT8
516 #define RXSTATUS_CODE_VIOLATION BIT8
517 #define RXSTATUS_EXITED_HUNT BIT7
518 #define RXSTATUS_IDLE_RECEIVED BIT6
519 #define RXSTATUS_BREAK_RECEIVED BIT5
520 #define RXSTATUS_ABORT_RECEIVED BIT5
521 #define RXSTATUS_RXBOUND BIT4
522 #define RXSTATUS_CRC_ERROR BIT3
523 #define RXSTATUS_FRAMING_ERROR BIT3
524 #define RXSTATUS_ABORT BIT2
525 #define RXSTATUS_PARITY_ERROR BIT2
526 #define RXSTATUS_OVERRUN BIT1
527 #define RXSTATUS_DATA_AVAILABLE BIT0
528 #define RXSTATUS_ALL 0x01f6
529 #define usc_UnlatchRxstatusBits(a,b) usc_OutReg( (a), RCSR, (u16)((b) & RXSTATUS_ALL) )
532 * Values for setting transmit idle mode in
533 * Transmit Control/status Register (TCSR)
535 #define IDLEMODE_FLAGS 0x0000
536 #define IDLEMODE_ALT_ONE_ZERO 0x0100
537 #define IDLEMODE_ZERO 0x0200
538 #define IDLEMODE_ONE 0x0300
539 #define IDLEMODE_ALT_MARK_SPACE 0x0500
540 #define IDLEMODE_SPACE 0x0600
541 #define IDLEMODE_MARK 0x0700
542 #define IDLEMODE_MASK 0x0700
545 * IUSC revision identifiers
547 #define IUSC_SL1660 0x4d44
548 #define IUSC_PRE_SL1660 0x4553
551 * Transmit status Bits in Transmit Command/status Register (TCSR)
554 #define TCSR_PRESERVE 0x0F00
556 #define TCSR_UNDERWAIT BIT11
557 #define TXSTATUS_PREAMBLE_SENT BIT7
558 #define TXSTATUS_IDLE_SENT BIT6
559 #define TXSTATUS_ABORT_SENT BIT5
560 #define TXSTATUS_EOF_SENT BIT4
561 #define TXSTATUS_EOM_SENT BIT4
562 #define TXSTATUS_CRC_SENT BIT3
563 #define TXSTATUS_ALL_SENT BIT2
564 #define TXSTATUS_UNDERRUN BIT1
565 #define TXSTATUS_FIFO_EMPTY BIT0
566 #define TXSTATUS_ALL 0x00fa
567 #define usc_UnlatchTxstatusBits(a,b) usc_OutReg( (a), TCSR, (u16)((a)->tcsr_value + ((b) & 0x00FF)) )
570 #define MISCSTATUS_RXC_LATCHED BIT15
571 #define MISCSTATUS_RXC BIT14
572 #define MISCSTATUS_TXC_LATCHED BIT13
573 #define MISCSTATUS_TXC BIT12
574 #define MISCSTATUS_RI_LATCHED BIT11
575 #define MISCSTATUS_RI BIT10
576 #define MISCSTATUS_DSR_LATCHED BIT9
577 #define MISCSTATUS_DSR BIT8
578 #define MISCSTATUS_DCD_LATCHED BIT7
579 #define MISCSTATUS_DCD BIT6
580 #define MISCSTATUS_CTS_LATCHED BIT5
581 #define MISCSTATUS_CTS BIT4
582 #define MISCSTATUS_RCC_UNDERRUN BIT3
583 #define MISCSTATUS_DPLL_NO_SYNC BIT2
584 #define MISCSTATUS_BRG1_ZERO BIT1
585 #define MISCSTATUS_BRG0_ZERO BIT0
587 #define usc_UnlatchIostatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0xaaa0))
588 #define usc_UnlatchMiscstatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0x000f))
590 #define SICR_RXC_ACTIVE BIT15
591 #define SICR_RXC_INACTIVE BIT14
592 #define SICR_RXC (BIT15+BIT14)
593 #define SICR_TXC_ACTIVE BIT13
594 #define SICR_TXC_INACTIVE BIT12
595 #define SICR_TXC (BIT13+BIT12)
596 #define SICR_RI_ACTIVE BIT11
597 #define SICR_RI_INACTIVE BIT10
598 #define SICR_RI (BIT11+BIT10)
599 #define SICR_DSR_ACTIVE BIT9
600 #define SICR_DSR_INACTIVE BIT8
601 #define SICR_DSR (BIT9+BIT8)
602 #define SICR_DCD_ACTIVE BIT7
603 #define SICR_DCD_INACTIVE BIT6
604 #define SICR_DCD (BIT7+BIT6)
605 #define SICR_CTS_ACTIVE BIT5
606 #define SICR_CTS_INACTIVE BIT4
607 #define SICR_CTS (BIT5+BIT4)
608 #define SICR_RCC_UNDERFLOW BIT3
609 #define SICR_DPLL_NO_SYNC BIT2
610 #define SICR_BRG1_ZERO BIT1
611 #define SICR_BRG0_ZERO BIT0
613 void usc_DisableMasterIrqBit( struct mgsl_struct *info );
614 void usc_EnableMasterIrqBit( struct mgsl_struct *info );
615 void usc_EnableInterrupts( struct mgsl_struct *info, u16 IrqMask );
616 void usc_DisableInterrupts( struct mgsl_struct *info, u16 IrqMask );
617 void usc_ClearIrqPendingBits( struct mgsl_struct *info, u16 IrqMask );
619 #define usc_EnableInterrupts( a, b ) \
620 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0xc0 + (b)) )
622 #define usc_DisableInterrupts( a, b ) \
623 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0x80 + (b)) )
625 #define usc_EnableMasterIrqBit(a) \
626 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0x0f00) + 0xb000) )
628 #define usc_DisableMasterIrqBit(a) \
629 usc_OutReg( (a), ICR, (u16)(usc_InReg((a),ICR) & 0x7f00) )
631 #define usc_ClearIrqPendingBits( a, b ) usc_OutReg( (a), DCCR, 0x40 + (b) )
634 * Transmit status Bits in Transmit Control status Register (TCSR)
635 * and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0)
638 #define TXSTATUS_PREAMBLE_SENT BIT7
639 #define TXSTATUS_IDLE_SENT BIT6
640 #define TXSTATUS_ABORT_SENT BIT5
641 #define TXSTATUS_EOF BIT4
642 #define TXSTATUS_CRC_SENT BIT3
643 #define TXSTATUS_ALL_SENT BIT2
644 #define TXSTATUS_UNDERRUN BIT1
645 #define TXSTATUS_FIFO_EMPTY BIT0
647 #define DICR_MASTER BIT15
648 #define DICR_TRANSMIT BIT0
649 #define DICR_RECEIVE BIT1
651 #define usc_EnableDmaInterrupts(a,b) \
652 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) | (b)) )
654 #define usc_DisableDmaInterrupts(a,b) \
655 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) & ~(b)) )
657 #define usc_EnableStatusIrqs(a,b) \
658 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) | (b)) )
660 #define usc_DisablestatusIrqs(a,b) \
661 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) & ~(b)) )
663 /* Transmit status Bits in Transmit Control status Register (TCSR) */
664 /* and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0) */
667 #define DISABLE_UNCONDITIONAL 0
668 #define DISABLE_END_OF_FRAME 1
669 #define ENABLE_UNCONDITIONAL 2
670 #define ENABLE_AUTO_CTS 3
671 #define ENABLE_AUTO_DCD 3
672 #define usc_EnableTransmitter(a,b) \
673 usc_OutReg( (a), TMR, (u16)((usc_InReg((a),TMR) & 0xfffc) | (b)) )
674 #define usc_EnableReceiver(a,b) \
675 usc_OutReg( (a), RMR, (u16)((usc_InReg((a),RMR) & 0xfffc) | (b)) )
677 static u16 usc_InDmaReg( struct mgsl_struct *info, u16 Port );
678 static void usc_OutDmaReg( struct mgsl_struct *info, u16 Port, u16 Value );
679 static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd );
681 static u16 usc_InReg( struct mgsl_struct *info, u16 Port );
682 static void usc_OutReg( struct mgsl_struct *info, u16 Port, u16 Value );
683 static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd );
684 void usc_RCmd( struct mgsl_struct *info, u16 Cmd );
685 void usc_TCmd( struct mgsl_struct *info, u16 Cmd );
687 #define usc_TCmd(a,b) usc_OutReg((a), TCSR, (u16)((a)->tcsr_value + (b)))
688 #define usc_RCmd(a,b) usc_OutReg((a), RCSR, (b))
690 #define usc_SetTransmitSyncChars(a,s0,s1) usc_OutReg((a), TSR, (u16)(((u16)s0<<8)|(u16)s1))
692 static void usc_process_rxoverrun_sync( struct mgsl_struct *info );
693 static void usc_start_receiver( struct mgsl_struct *info );
694 static void usc_stop_receiver( struct mgsl_struct *info );
696 static void usc_start_transmitter( struct mgsl_struct *info );
697 static void usc_stop_transmitter( struct mgsl_struct *info );
698 static void usc_set_txidle( struct mgsl_struct *info );
699 static void usc_load_txfifo( struct mgsl_struct *info );
701 static void usc_enable_aux_clock( struct mgsl_struct *info, u32 DataRate );
702 static void usc_enable_loopback( struct mgsl_struct *info, int enable );
704 static void usc_get_serial_signals( struct mgsl_struct *info );
705 static void usc_set_serial_signals( struct mgsl_struct *info );
707 static void usc_reset( struct mgsl_struct *info );
709 static void usc_set_sync_mode( struct mgsl_struct *info );
710 static void usc_set_sdlc_mode( struct mgsl_struct *info );
711 static void usc_set_async_mode( struct mgsl_struct *info );
712 static void usc_enable_async_clock( struct mgsl_struct *info, u32 DataRate );
714 static void usc_loopback_frame( struct mgsl_struct *info );
716 static void mgsl_tx_timeout(unsigned long context);
719 static void usc_loopmode_cancel_transmit( struct mgsl_struct * info );
720 static void usc_loopmode_insert_request( struct mgsl_struct * info );
721 static int usc_loopmode_active( struct mgsl_struct * info);
722 static void usc_loopmode_send_done( struct mgsl_struct * info );
724 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg);
726 #if SYNCLINK_GENERIC_HDLC
727 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
728 static void hdlcdev_tx_done(struct mgsl_struct *info);
729 static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size);
730 static int hdlcdev_init(struct mgsl_struct *info);
731 static void hdlcdev_exit(struct mgsl_struct *info);
735 * Defines a BUS descriptor value for the PCI adapter
736 * local bus address ranges.
739 #define BUS_DESCRIPTOR( WrHold, WrDly, RdDly, Nwdd, Nwad, Nxda, Nrdd, Nrad ) \
750 static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit);
753 * Adapter diagnostic routines
755 static bool mgsl_register_test( struct mgsl_struct *info );
756 static bool mgsl_irq_test( struct mgsl_struct *info );
757 static bool mgsl_dma_test( struct mgsl_struct *info );
758 static bool mgsl_memory_test( struct mgsl_struct *info );
759 static int mgsl_adapter_test( struct mgsl_struct *info );
762 * device and resource management routines
764 static int mgsl_claim_resources(struct mgsl_struct *info);
765 static void mgsl_release_resources(struct mgsl_struct *info);
766 static void mgsl_add_device(struct mgsl_struct *info);
767 static struct mgsl_struct* mgsl_allocate_device(void);
770 * DMA buffer manupulation functions.
772 static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex );
773 static bool mgsl_get_rx_frame( struct mgsl_struct *info );
774 static bool mgsl_get_raw_rx_frame( struct mgsl_struct *info );
775 static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info );
776 static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info );
777 static int num_free_tx_dma_buffers(struct mgsl_struct *info);
778 static void mgsl_load_tx_dma_buffer( struct mgsl_struct *info, const char *Buffer, unsigned int BufferSize);
779 static void mgsl_load_pci_memory(char* TargetPtr, const char* SourcePtr, unsigned short count);
782 * DMA and Shared Memory buffer allocation and formatting
784 static int mgsl_allocate_dma_buffers(struct mgsl_struct *info);
785 static void mgsl_free_dma_buffers(struct mgsl_struct *info);
786 static int mgsl_alloc_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
787 static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
788 static int mgsl_alloc_buffer_list_memory(struct mgsl_struct *info);
789 static void mgsl_free_buffer_list_memory(struct mgsl_struct *info);
790 static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info);
791 static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info);
792 static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info);
793 static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info);
794 static bool load_next_tx_holding_buffer(struct mgsl_struct *info);
795 static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize);
798 * Bottom half interrupt handlers
800 static void mgsl_bh_handler(struct work_struct *work);
801 static void mgsl_bh_receive(struct mgsl_struct *info);
802 static void mgsl_bh_transmit(struct mgsl_struct *info);
803 static void mgsl_bh_status(struct mgsl_struct *info);
806 * Interrupt handler routines and dispatch table.
808 static void mgsl_isr_null( struct mgsl_struct *info );
809 static void mgsl_isr_transmit_data( struct mgsl_struct *info );
810 static void mgsl_isr_receive_data( struct mgsl_struct *info );
811 static void mgsl_isr_receive_status( struct mgsl_struct *info );
812 static void mgsl_isr_transmit_status( struct mgsl_struct *info );
813 static void mgsl_isr_io_pin( struct mgsl_struct *info );
814 static void mgsl_isr_misc( struct mgsl_struct *info );
815 static void mgsl_isr_receive_dma( struct mgsl_struct *info );
816 static void mgsl_isr_transmit_dma( struct mgsl_struct *info );
818 typedef void (*isr_dispatch_func)(struct mgsl_struct *);
820 static isr_dispatch_func UscIsrTable[7] =
825 mgsl_isr_transmit_data,
826 mgsl_isr_transmit_status,
827 mgsl_isr_receive_data,
828 mgsl_isr_receive_status
832 * ioctl call handlers
834 static int tiocmget(struct tty_struct *tty, struct file *file);
835 static int tiocmset(struct tty_struct *tty, struct file *file,
836 unsigned int set, unsigned int clear);
837 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount
838 __user *user_icount);
839 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params);
840 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params);
841 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode);
842 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode);
843 static int mgsl_txenable(struct mgsl_struct * info, int enable);
844 static int mgsl_txabort(struct mgsl_struct * info);
845 static int mgsl_rxenable(struct mgsl_struct * info, int enable);
846 static int mgsl_wait_event(struct mgsl_struct * info, int __user *mask);
847 static int mgsl_loopmode_send_done( struct mgsl_struct * info );
849 /* set non-zero on successful registration with PCI subsystem */
850 static bool pci_registered;
853 * Global linked list of SyncLink devices
855 static struct mgsl_struct *mgsl_device_list;
856 static int mgsl_device_count;
859 * Set this param to non-zero to load eax with the
860 * .text section address and breakpoint on module load.
861 * This is useful for use with gdb and add-symbol-file command.
863 static int break_on_load;
866 * Driver major number, defaults to zero to get auto
867 * assigned major number. May be forced as module parameter.
872 * Array of user specified options for ISA adapters.
874 static int io[MAX_ISA_DEVICES];
875 static int irq[MAX_ISA_DEVICES];
876 static int dma[MAX_ISA_DEVICES];
877 static int debug_level;
878 static int maxframe[MAX_TOTAL_DEVICES];
879 static int dosyncppp[MAX_TOTAL_DEVICES];
880 static int txdmabufs[MAX_TOTAL_DEVICES];
881 static int txholdbufs[MAX_TOTAL_DEVICES];
883 module_param(break_on_load, bool, 0);
884 module_param(ttymajor, int, 0);
885 module_param_array(io, int, NULL, 0);
886 module_param_array(irq, int, NULL, 0);
887 module_param_array(dma, int, NULL, 0);
888 module_param(debug_level, int, 0);
889 module_param_array(maxframe, int, NULL, 0);
890 module_param_array(dosyncppp, int, NULL, 0);
891 module_param_array(txdmabufs, int, NULL, 0);
892 module_param_array(txholdbufs, int, NULL, 0);
894 static char *driver_name = "SyncLink serial driver";
895 static char *driver_version = "$Revision: 4.38 $";
897 static int synclink_init_one (struct pci_dev *dev,
898 const struct pci_device_id *ent);
899 static void synclink_remove_one (struct pci_dev *dev);
901 static struct pci_device_id synclink_pci_tbl[] = {
902 { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_USC, PCI_ANY_ID, PCI_ANY_ID, },
903 { PCI_VENDOR_ID_MICROGATE, 0x0210, PCI_ANY_ID, PCI_ANY_ID, },
904 { 0, }, /* terminate list */
906 MODULE_DEVICE_TABLE(pci, synclink_pci_tbl);
908 MODULE_LICENSE("GPL");
910 static struct pci_driver synclink_pci_driver = {
912 .id_table = synclink_pci_tbl,
913 .probe = synclink_init_one,
914 .remove = __devexit_p(synclink_remove_one),
917 static struct tty_driver *serial_driver;
919 /* number of characters left in xmit buffer before we ask for more */
920 #define WAKEUP_CHARS 256
923 static void mgsl_change_params(struct mgsl_struct *info);
924 static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout);
927 * 1st function defined in .text section. Calling this function in
928 * init_module() followed by a breakpoint allows a remote debugger
929 * (gdb) to get the .text address for the add-symbol-file command.
930 * This allows remote debugging of dynamically loadable modules.
932 static void* mgsl_get_text_ptr(void)
934 return mgsl_get_text_ptr;
937 static inline int mgsl_paranoia_check(struct mgsl_struct *info,
938 char *name, const char *routine)
940 #ifdef MGSL_PARANOIA_CHECK
941 static const char *badmagic =
942 "Warning: bad magic number for mgsl struct (%s) in %s\n";
943 static const char *badinfo =
944 "Warning: null mgsl_struct for (%s) in %s\n";
947 printk(badinfo, name, routine);
950 if (info->magic != MGSL_MAGIC) {
951 printk(badmagic, name, routine);
962 * line discipline callback wrappers
964 * The wrappers maintain line discipline references
965 * while calling into the line discipline.
967 * ldisc_receive_buf - pass receive data to line discipline
970 static void ldisc_receive_buf(struct tty_struct *tty,
971 const __u8 *data, char *flags, int count)
973 struct tty_ldisc *ld;
976 ld = tty_ldisc_ref(tty);
979 ld->receive_buf(tty, data, flags, count);
984 /* mgsl_stop() throttle (stop) transmitter
986 * Arguments: tty pointer to tty info structure
989 static void mgsl_stop(struct tty_struct *tty)
991 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
994 if (mgsl_paranoia_check(info, tty->name, "mgsl_stop"))
997 if ( debug_level >= DEBUG_LEVEL_INFO )
998 printk("mgsl_stop(%s)\n",info->device_name);
1000 spin_lock_irqsave(&info->irq_spinlock,flags);
1001 if (info->tx_enabled)
1002 usc_stop_transmitter(info);
1003 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1005 } /* end of mgsl_stop() */
1007 /* mgsl_start() release (start) transmitter
1009 * Arguments: tty pointer to tty info structure
1010 * Return Value: None
1012 static void mgsl_start(struct tty_struct *tty)
1014 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
1015 unsigned long flags;
1017 if (mgsl_paranoia_check(info, tty->name, "mgsl_start"))
1020 if ( debug_level >= DEBUG_LEVEL_INFO )
1021 printk("mgsl_start(%s)\n",info->device_name);
1023 spin_lock_irqsave(&info->irq_spinlock,flags);
1024 if (!info->tx_enabled)
1025 usc_start_transmitter(info);
1026 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1028 } /* end of mgsl_start() */
1031 * Bottom half work queue access functions
1034 /* mgsl_bh_action() Return next bottom half action to perform.
1035 * Return Value: BH action code or 0 if nothing to do.
1037 static int mgsl_bh_action(struct mgsl_struct *info)
1039 unsigned long flags;
1042 spin_lock_irqsave(&info->irq_spinlock,flags);
1044 if (info->pending_bh & BH_RECEIVE) {
1045 info->pending_bh &= ~BH_RECEIVE;
1047 } else if (info->pending_bh & BH_TRANSMIT) {
1048 info->pending_bh &= ~BH_TRANSMIT;
1050 } else if (info->pending_bh & BH_STATUS) {
1051 info->pending_bh &= ~BH_STATUS;
1056 /* Mark BH routine as complete */
1057 info->bh_running = false;
1058 info->bh_requested = false;
1061 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1067 * Perform bottom half processing of work items queued by ISR.
1069 static void mgsl_bh_handler(struct work_struct *work)
1071 struct mgsl_struct *info =
1072 container_of(work, struct mgsl_struct, task);
1078 if ( debug_level >= DEBUG_LEVEL_BH )
1079 printk( "%s(%d):mgsl_bh_handler(%s) entry\n",
1080 __FILE__,__LINE__,info->device_name);
1082 info->bh_running = true;
1084 while((action = mgsl_bh_action(info)) != 0) {
1086 /* Process work item */
1087 if ( debug_level >= DEBUG_LEVEL_BH )
1088 printk( "%s(%d):mgsl_bh_handler() work item action=%d\n",
1089 __FILE__,__LINE__,action);
1094 mgsl_bh_receive(info);
1097 mgsl_bh_transmit(info);
1100 mgsl_bh_status(info);
1103 /* unknown work item ID */
1104 printk("Unknown work item ID=%08X!\n", action);
1109 if ( debug_level >= DEBUG_LEVEL_BH )
1110 printk( "%s(%d):mgsl_bh_handler(%s) exit\n",
1111 __FILE__,__LINE__,info->device_name);
1114 static void mgsl_bh_receive(struct mgsl_struct *info)
1116 bool (*get_rx_frame)(struct mgsl_struct *info) =
1117 (info->params.mode == MGSL_MODE_HDLC ? mgsl_get_rx_frame : mgsl_get_raw_rx_frame);
1119 if ( debug_level >= DEBUG_LEVEL_BH )
1120 printk( "%s(%d):mgsl_bh_receive(%s)\n",
1121 __FILE__,__LINE__,info->device_name);
1125 if (info->rx_rcc_underrun) {
1126 unsigned long flags;
1127 spin_lock_irqsave(&info->irq_spinlock,flags);
1128 usc_start_receiver(info);
1129 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1132 } while(get_rx_frame(info));
1135 static void mgsl_bh_transmit(struct mgsl_struct *info)
1137 struct tty_struct *tty = info->tty;
1138 unsigned long flags;
1140 if ( debug_level >= DEBUG_LEVEL_BH )
1141 printk( "%s(%d):mgsl_bh_transmit() entry on %s\n",
1142 __FILE__,__LINE__,info->device_name);
1147 /* if transmitter idle and loopmode_send_done_requested
1148 * then start echoing RxD to TxD
1150 spin_lock_irqsave(&info->irq_spinlock,flags);
1151 if ( !info->tx_active && info->loopmode_send_done_requested )
1152 usc_loopmode_send_done( info );
1153 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1156 static void mgsl_bh_status(struct mgsl_struct *info)
1158 if ( debug_level >= DEBUG_LEVEL_BH )
1159 printk( "%s(%d):mgsl_bh_status() entry on %s\n",
1160 __FILE__,__LINE__,info->device_name);
1162 info->ri_chkcount = 0;
1163 info->dsr_chkcount = 0;
1164 info->dcd_chkcount = 0;
1165 info->cts_chkcount = 0;
1168 /* mgsl_isr_receive_status()
1170 * Service a receive status interrupt. The type of status
1171 * interrupt is indicated by the state of the RCSR.
1172 * This is only used for HDLC mode.
1174 * Arguments: info pointer to device instance data
1175 * Return Value: None
1177 static void mgsl_isr_receive_status( struct mgsl_struct *info )
1179 u16 status = usc_InReg( info, RCSR );
1181 if ( debug_level >= DEBUG_LEVEL_ISR )
1182 printk("%s(%d):mgsl_isr_receive_status status=%04X\n",
1183 __FILE__,__LINE__,status);
1185 if ( (status & RXSTATUS_ABORT_RECEIVED) &&
1186 info->loopmode_insert_requested &&
1187 usc_loopmode_active(info) )
1189 ++info->icount.rxabort;
1190 info->loopmode_insert_requested = false;
1192 /* clear CMR:13 to start echoing RxD to TxD */
1193 info->cmr_value &= ~BIT13;
1194 usc_OutReg(info, CMR, info->cmr_value);
1196 /* disable received abort irq (no longer required) */
1197 usc_OutReg(info, RICR,
1198 (usc_InReg(info, RICR) & ~RXSTATUS_ABORT_RECEIVED));
1201 if (status & (RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED)) {
1202 if (status & RXSTATUS_EXITED_HUNT)
1203 info->icount.exithunt++;
1204 if (status & RXSTATUS_IDLE_RECEIVED)
1205 info->icount.rxidle++;
1206 wake_up_interruptible(&info->event_wait_q);
1209 if (status & RXSTATUS_OVERRUN){
1210 info->icount.rxover++;
1211 usc_process_rxoverrun_sync( info );
1214 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
1215 usc_UnlatchRxstatusBits( info, status );
1217 } /* end of mgsl_isr_receive_status() */
1219 /* mgsl_isr_transmit_status()
1221 * Service a transmit status interrupt
1222 * HDLC mode :end of transmit frame
1223 * Async mode:all data is sent
1224 * transmit status is indicated by bits in the TCSR.
1226 * Arguments: info pointer to device instance data
1227 * Return Value: None
1229 static void mgsl_isr_transmit_status( struct mgsl_struct *info )
1231 u16 status = usc_InReg( info, TCSR );
1233 if ( debug_level >= DEBUG_LEVEL_ISR )
1234 printk("%s(%d):mgsl_isr_transmit_status status=%04X\n",
1235 __FILE__,__LINE__,status);
1237 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
1238 usc_UnlatchTxstatusBits( info, status );
1240 if ( status & (TXSTATUS_UNDERRUN | TXSTATUS_ABORT_SENT) )
1242 /* finished sending HDLC abort. This may leave */
1243 /* the TxFifo with data from the aborted frame */
1244 /* so purge the TxFifo. Also shutdown the DMA */
1245 /* channel in case there is data remaining in */
1246 /* the DMA buffer */
1247 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
1248 usc_RTCmd( info, RTCmd_PurgeTxFifo );
1251 if ( status & TXSTATUS_EOF_SENT )
1252 info->icount.txok++;
1253 else if ( status & TXSTATUS_UNDERRUN )
1254 info->icount.txunder++;
1255 else if ( status & TXSTATUS_ABORT_SENT )
1256 info->icount.txabort++;
1258 info->icount.txunder++;
1260 info->tx_active = false;
1261 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1262 del_timer(&info->tx_timer);
1264 if ( info->drop_rts_on_tx_done ) {
1265 usc_get_serial_signals( info );
1266 if ( info->serial_signals & SerialSignal_RTS ) {
1267 info->serial_signals &= ~SerialSignal_RTS;
1268 usc_set_serial_signals( info );
1270 info->drop_rts_on_tx_done = false;
1273 #if SYNCLINK_GENERIC_HDLC
1275 hdlcdev_tx_done(info);
1279 if (info->tty->stopped || info->tty->hw_stopped) {
1280 usc_stop_transmitter(info);
1283 info->pending_bh |= BH_TRANSMIT;
1286 } /* end of mgsl_isr_transmit_status() */
1288 /* mgsl_isr_io_pin()
1290 * Service an Input/Output pin interrupt. The type of
1291 * interrupt is indicated by bits in the MISR
1293 * Arguments: info pointer to device instance data
1294 * Return Value: None
1296 static void mgsl_isr_io_pin( struct mgsl_struct *info )
1298 struct mgsl_icount *icount;
1299 u16 status = usc_InReg( info, MISR );
1301 if ( debug_level >= DEBUG_LEVEL_ISR )
1302 printk("%s(%d):mgsl_isr_io_pin status=%04X\n",
1303 __FILE__,__LINE__,status);
1305 usc_ClearIrqPendingBits( info, IO_PIN );
1306 usc_UnlatchIostatusBits( info, status );
1308 if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
1309 MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
1310 icount = &info->icount;
1311 /* update input line counters */
1312 if (status & MISCSTATUS_RI_LATCHED) {
1313 if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1314 usc_DisablestatusIrqs(info,SICR_RI);
1316 if ( status & MISCSTATUS_RI )
1317 info->input_signal_events.ri_up++;
1319 info->input_signal_events.ri_down++;
1321 if (status & MISCSTATUS_DSR_LATCHED) {
1322 if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1323 usc_DisablestatusIrqs(info,SICR_DSR);
1325 if ( status & MISCSTATUS_DSR )
1326 info->input_signal_events.dsr_up++;
1328 info->input_signal_events.dsr_down++;
1330 if (status & MISCSTATUS_DCD_LATCHED) {
1331 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1332 usc_DisablestatusIrqs(info,SICR_DCD);
1334 if (status & MISCSTATUS_DCD) {
1335 info->input_signal_events.dcd_up++;
1337 info->input_signal_events.dcd_down++;
1338 #if SYNCLINK_GENERIC_HDLC
1339 if (info->netcount) {
1340 if (status & MISCSTATUS_DCD)
1341 netif_carrier_on(info->netdev);
1343 netif_carrier_off(info->netdev);
1347 if (status & MISCSTATUS_CTS_LATCHED)
1349 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1350 usc_DisablestatusIrqs(info,SICR_CTS);
1352 if ( status & MISCSTATUS_CTS )
1353 info->input_signal_events.cts_up++;
1355 info->input_signal_events.cts_down++;
1357 wake_up_interruptible(&info->status_event_wait_q);
1358 wake_up_interruptible(&info->event_wait_q);
1360 if ( (info->flags & ASYNC_CHECK_CD) &&
1361 (status & MISCSTATUS_DCD_LATCHED) ) {
1362 if ( debug_level >= DEBUG_LEVEL_ISR )
1363 printk("%s CD now %s...", info->device_name,
1364 (status & MISCSTATUS_DCD) ? "on" : "off");
1365 if (status & MISCSTATUS_DCD)
1366 wake_up_interruptible(&info->open_wait);
1368 if ( debug_level >= DEBUG_LEVEL_ISR )
1369 printk("doing serial hangup...");
1371 tty_hangup(info->tty);
1375 if ( (info->flags & ASYNC_CTS_FLOW) &&
1376 (status & MISCSTATUS_CTS_LATCHED) ) {
1377 if (info->tty->hw_stopped) {
1378 if (status & MISCSTATUS_CTS) {
1379 if ( debug_level >= DEBUG_LEVEL_ISR )
1380 printk("CTS tx start...");
1382 info->tty->hw_stopped = 0;
1383 usc_start_transmitter(info);
1384 info->pending_bh |= BH_TRANSMIT;
1388 if (!(status & MISCSTATUS_CTS)) {
1389 if ( debug_level >= DEBUG_LEVEL_ISR )
1390 printk("CTS tx stop...");
1392 info->tty->hw_stopped = 1;
1393 usc_stop_transmitter(info);
1399 info->pending_bh |= BH_STATUS;
1401 /* for diagnostics set IRQ flag */
1402 if ( status & MISCSTATUS_TXC_LATCHED ){
1403 usc_OutReg( info, SICR,
1404 (unsigned short)(usc_InReg(info,SICR) & ~(SICR_TXC_ACTIVE+SICR_TXC_INACTIVE)) );
1405 usc_UnlatchIostatusBits( info, MISCSTATUS_TXC_LATCHED );
1406 info->irq_occurred = true;
1409 } /* end of mgsl_isr_io_pin() */
1411 /* mgsl_isr_transmit_data()
1413 * Service a transmit data interrupt (async mode only).
1415 * Arguments: info pointer to device instance data
1416 * Return Value: None
1418 static void mgsl_isr_transmit_data( struct mgsl_struct *info )
1420 if ( debug_level >= DEBUG_LEVEL_ISR )
1421 printk("%s(%d):mgsl_isr_transmit_data xmit_cnt=%d\n",
1422 __FILE__,__LINE__,info->xmit_cnt);
1424 usc_ClearIrqPendingBits( info, TRANSMIT_DATA );
1426 if (info->tty->stopped || info->tty->hw_stopped) {
1427 usc_stop_transmitter(info);
1431 if ( info->xmit_cnt )
1432 usc_load_txfifo( info );
1434 info->tx_active = false;
1436 if (info->xmit_cnt < WAKEUP_CHARS)
1437 info->pending_bh |= BH_TRANSMIT;
1439 } /* end of mgsl_isr_transmit_data() */
1441 /* mgsl_isr_receive_data()
1443 * Service a receive data interrupt. This occurs
1444 * when operating in asynchronous interrupt transfer mode.
1445 * The receive data FIFO is flushed to the receive data buffers.
1447 * Arguments: info pointer to device instance data
1448 * Return Value: None
1450 static void mgsl_isr_receive_data( struct mgsl_struct *info )
1455 unsigned char DataByte;
1456 struct tty_struct *tty = info->tty;
1457 struct mgsl_icount *icount = &info->icount;
1459 if ( debug_level >= DEBUG_LEVEL_ISR )
1460 printk("%s(%d):mgsl_isr_receive_data\n",
1463 usc_ClearIrqPendingBits( info, RECEIVE_DATA );
1465 /* select FIFO status for RICR readback */
1466 usc_RCmd( info, RCmd_SelectRicrRxFifostatus );
1468 /* clear the Wordstatus bit so that status readback */
1469 /* only reflects the status of this byte */
1470 usc_OutReg( info, RICR+LSBONLY, (u16)(usc_InReg(info, RICR+LSBONLY) & ~BIT3 ));
1472 /* flush the receive FIFO */
1474 while( (Fifocount = (usc_InReg(info,RICR) >> 8)) ) {
1477 /* read one byte from RxFIFO */
1478 outw( (inw(info->io_base + CCAR) & 0x0780) | (RDR+LSBONLY),
1479 info->io_base + CCAR );
1480 DataByte = inb( info->io_base + CCAR );
1482 /* get the status of the received byte */
1483 status = usc_InReg(info, RCSR);
1484 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1485 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) )
1486 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
1491 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1492 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) ) {
1493 printk("rxerr=%04X\n",status);
1494 /* update error statistics */
1495 if ( status & RXSTATUS_BREAK_RECEIVED ) {
1496 status &= ~(RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR);
1498 } else if (status & RXSTATUS_PARITY_ERROR)
1500 else if (status & RXSTATUS_FRAMING_ERROR)
1502 else if (status & RXSTATUS_OVERRUN) {
1503 /* must issue purge fifo cmd before */
1504 /* 16C32 accepts more receive chars */
1505 usc_RTCmd(info,RTCmd_PurgeRxFifo);
1509 /* discard char if tty control flags say so */
1510 if (status & info->ignore_status_mask)
1513 status &= info->read_status_mask;
1515 if (status & RXSTATUS_BREAK_RECEIVED) {
1517 if (info->flags & ASYNC_SAK)
1519 } else if (status & RXSTATUS_PARITY_ERROR)
1521 else if (status & RXSTATUS_FRAMING_ERROR)
1523 } /* end of if (error) */
1524 tty_insert_flip_char(tty, DataByte, flag);
1525 if (status & RXSTATUS_OVERRUN) {
1526 /* Overrun is special, since it's
1527 * reported immediately, and doesn't
1528 * affect the current character
1530 work += tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1534 if ( debug_level >= DEBUG_LEVEL_ISR ) {
1535 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
1536 __FILE__,__LINE__,icount->rx,icount->brk,
1537 icount->parity,icount->frame,icount->overrun);
1541 tty_flip_buffer_push(tty);
1546 * Service a miscellaneous interrupt source.
1548 * Arguments: info pointer to device extension (instance data)
1549 * Return Value: None
1551 static void mgsl_isr_misc( struct mgsl_struct *info )
1553 u16 status = usc_InReg( info, MISR );
1555 if ( debug_level >= DEBUG_LEVEL_ISR )
1556 printk("%s(%d):mgsl_isr_misc status=%04X\n",
1557 __FILE__,__LINE__,status);
1559 if ((status & MISCSTATUS_RCC_UNDERRUN) &&
1560 (info->params.mode == MGSL_MODE_HDLC)) {
1562 /* turn off receiver and rx DMA */
1563 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
1564 usc_DmaCmd(info, DmaCmd_ResetRxChannel);
1565 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
1566 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
1567 usc_DisableInterrupts(info, RECEIVE_DATA + RECEIVE_STATUS);
1569 /* schedule BH handler to restart receiver */
1570 info->pending_bh |= BH_RECEIVE;
1571 info->rx_rcc_underrun = true;
1574 usc_ClearIrqPendingBits( info, MISC );
1575 usc_UnlatchMiscstatusBits( info, status );
1577 } /* end of mgsl_isr_misc() */
1581 * Services undefined interrupt vectors from the
1582 * USC. (hence this function SHOULD never be called)
1584 * Arguments: info pointer to device extension (instance data)
1585 * Return Value: None
1587 static void mgsl_isr_null( struct mgsl_struct *info )
1590 } /* end of mgsl_isr_null() */
1592 /* mgsl_isr_receive_dma()
1594 * Service a receive DMA channel interrupt.
1595 * For this driver there are two sources of receive DMA interrupts
1596 * as identified in the Receive DMA mode Register (RDMR):
1598 * BIT3 EOA/EOL End of List, all receive buffers in receive
1599 * buffer list have been filled (no more free buffers
1600 * available). The DMA controller has shut down.
1602 * BIT2 EOB End of Buffer. This interrupt occurs when a receive
1603 * DMA buffer is terminated in response to completion
1604 * of a good frame or a frame with errors. The status
1605 * of the frame is stored in the buffer entry in the
1606 * list of receive buffer entries.
1608 * Arguments: info pointer to device instance data
1609 * Return Value: None
1611 static void mgsl_isr_receive_dma( struct mgsl_struct *info )
1615 /* clear interrupt pending and IUS bit for Rx DMA IRQ */
1616 usc_OutDmaReg( info, CDIR, BIT9+BIT1 );
1618 /* Read the receive DMA status to identify interrupt type. */
1619 /* This also clears the status bits. */
1620 status = usc_InDmaReg( info, RDMR );
1622 if ( debug_level >= DEBUG_LEVEL_ISR )
1623 printk("%s(%d):mgsl_isr_receive_dma(%s) status=%04X\n",
1624 __FILE__,__LINE__,info->device_name,status);
1626 info->pending_bh |= BH_RECEIVE;
1628 if ( status & BIT3 ) {
1629 info->rx_overflow = true;
1630 info->icount.buf_overrun++;
1633 } /* end of mgsl_isr_receive_dma() */
1635 /* mgsl_isr_transmit_dma()
1637 * This function services a transmit DMA channel interrupt.
1639 * For this driver there is one source of transmit DMA interrupts
1640 * as identified in the Transmit DMA Mode Register (TDMR):
1642 * BIT2 EOB End of Buffer. This interrupt occurs when a
1643 * transmit DMA buffer has been emptied.
1645 * The driver maintains enough transmit DMA buffers to hold at least
1646 * one max frame size transmit frame. When operating in a buffered
1647 * transmit mode, there may be enough transmit DMA buffers to hold at
1648 * least two or more max frame size frames. On an EOB condition,
1649 * determine if there are any queued transmit buffers and copy into
1650 * transmit DMA buffers if we have room.
1652 * Arguments: info pointer to device instance data
1653 * Return Value: None
1655 static void mgsl_isr_transmit_dma( struct mgsl_struct *info )
1659 /* clear interrupt pending and IUS bit for Tx DMA IRQ */
1660 usc_OutDmaReg(info, CDIR, BIT8+BIT0 );
1662 /* Read the transmit DMA status to identify interrupt type. */
1663 /* This also clears the status bits. */
1665 status = usc_InDmaReg( info, TDMR );
1667 if ( debug_level >= DEBUG_LEVEL_ISR )
1668 printk("%s(%d):mgsl_isr_transmit_dma(%s) status=%04X\n",
1669 __FILE__,__LINE__,info->device_name,status);
1671 if ( status & BIT2 ) {
1672 --info->tx_dma_buffers_used;
1674 /* if there are transmit frames queued,
1675 * try to load the next one
1677 if ( load_next_tx_holding_buffer(info) ) {
1678 /* if call returns non-zero value, we have
1679 * at least one free tx holding buffer
1681 info->pending_bh |= BH_TRANSMIT;
1685 } /* end of mgsl_isr_transmit_dma() */
1689 * Interrupt service routine entry point.
1693 * irq interrupt number that caused interrupt
1694 * dev_id device ID supplied during interrupt registration
1696 * Return Value: None
1698 static irqreturn_t mgsl_interrupt(int dummy, void *dev_id)
1700 struct mgsl_struct *info = dev_id;
1704 if ( debug_level >= DEBUG_LEVEL_ISR )
1705 printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)entry.\n",
1706 __FILE__, __LINE__, info->irq_level);
1708 spin_lock(&info->irq_spinlock);
1711 /* Read the interrupt vectors from hardware. */
1712 UscVector = usc_InReg(info, IVR) >> 9;
1713 DmaVector = usc_InDmaReg(info, DIVR);
1715 if ( debug_level >= DEBUG_LEVEL_ISR )
1716 printk("%s(%d):%s UscVector=%08X DmaVector=%08X\n",
1717 __FILE__,__LINE__,info->device_name,UscVector,DmaVector);
1719 if ( !UscVector && !DmaVector )
1722 /* Dispatch interrupt vector */
1724 (*UscIsrTable[UscVector])(info);
1725 else if ( (DmaVector&(BIT10|BIT9)) == BIT10)
1726 mgsl_isr_transmit_dma(info);
1728 mgsl_isr_receive_dma(info);
1730 if ( info->isr_overflow ) {
1731 printk(KERN_ERR "%s(%d):%s isr overflow irq=%d\n",
1732 __FILE__, __LINE__, info->device_name, info->irq_level);
1733 usc_DisableMasterIrqBit(info);
1734 usc_DisableDmaInterrupts(info,DICR_MASTER);
1739 /* Request bottom half processing if there's something
1740 * for it to do and the bh is not already running
1743 if ( info->pending_bh && !info->bh_running && !info->bh_requested ) {
1744 if ( debug_level >= DEBUG_LEVEL_ISR )
1745 printk("%s(%d):%s queueing bh task.\n",
1746 __FILE__,__LINE__,info->device_name);
1747 schedule_work(&info->task);
1748 info->bh_requested = true;
1751 spin_unlock(&info->irq_spinlock);
1753 if ( debug_level >= DEBUG_LEVEL_ISR )
1754 printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)exit.\n",
1755 __FILE__, __LINE__, info->irq_level);
1758 } /* end of mgsl_interrupt() */
1762 * Initialize and start device.
1764 * Arguments: info pointer to device instance data
1765 * Return Value: 0 if success, otherwise error code
1767 static int startup(struct mgsl_struct * info)
1771 if ( debug_level >= DEBUG_LEVEL_INFO )
1772 printk("%s(%d):mgsl_startup(%s)\n",__FILE__,__LINE__,info->device_name);
1774 if (info->flags & ASYNC_INITIALIZED)
1777 if (!info->xmit_buf) {
1778 /* allocate a page of memory for a transmit buffer */
1779 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1780 if (!info->xmit_buf) {
1781 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1782 __FILE__,__LINE__,info->device_name);
1787 info->pending_bh = 0;
1789 memset(&info->icount, 0, sizeof(info->icount));
1791 setup_timer(&info->tx_timer, mgsl_tx_timeout, (unsigned long)info);
1793 /* Allocate and claim adapter resources */
1794 retval = mgsl_claim_resources(info);
1796 /* perform existence check and diagnostics */
1798 retval = mgsl_adapter_test(info);
1801 if (capable(CAP_SYS_ADMIN) && info->tty)
1802 set_bit(TTY_IO_ERROR, &info->tty->flags);
1803 mgsl_release_resources(info);
1807 /* program hardware for current parameters */
1808 mgsl_change_params(info);
1811 clear_bit(TTY_IO_ERROR, &info->tty->flags);
1813 info->flags |= ASYNC_INITIALIZED;
1817 } /* end of startup() */
1821 * Called by mgsl_close() and mgsl_hangup() to shutdown hardware
1823 * Arguments: info pointer to device instance data
1824 * Return Value: None
1826 static void shutdown(struct mgsl_struct * info)
1828 unsigned long flags;
1830 if (!(info->flags & ASYNC_INITIALIZED))
1833 if (debug_level >= DEBUG_LEVEL_INFO)
1834 printk("%s(%d):mgsl_shutdown(%s)\n",
1835 __FILE__,__LINE__, info->device_name );
1837 /* clear status wait queue because status changes */
1838 /* can't happen after shutting down the hardware */
1839 wake_up_interruptible(&info->status_event_wait_q);
1840 wake_up_interruptible(&info->event_wait_q);
1842 del_timer_sync(&info->tx_timer);
1844 if (info->xmit_buf) {
1845 free_page((unsigned long) info->xmit_buf);
1846 info->xmit_buf = NULL;
1849 spin_lock_irqsave(&info->irq_spinlock,flags);
1850 usc_DisableMasterIrqBit(info);
1851 usc_stop_receiver(info);
1852 usc_stop_transmitter(info);
1853 usc_DisableInterrupts(info,RECEIVE_DATA + RECEIVE_STATUS +
1854 TRANSMIT_DATA + TRANSMIT_STATUS + IO_PIN + MISC );
1855 usc_DisableDmaInterrupts(info,DICR_MASTER + DICR_TRANSMIT + DICR_RECEIVE);
1857 /* Disable DMAEN (Port 7, Bit 14) */
1858 /* This disconnects the DMA request signal from the ISA bus */
1859 /* on the ISA adapter. This has no effect for the PCI adapter */
1860 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) | BIT14));
1862 /* Disable INTEN (Port 6, Bit12) */
1863 /* This disconnects the IRQ request signal to the ISA bus */
1864 /* on the ISA adapter. This has no effect for the PCI adapter */
1865 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) | BIT12));
1867 if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
1868 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1869 usc_set_serial_signals(info);
1872 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1874 mgsl_release_resources(info);
1877 set_bit(TTY_IO_ERROR, &info->tty->flags);
1879 info->flags &= ~ASYNC_INITIALIZED;
1881 } /* end of shutdown() */
1883 static void mgsl_program_hw(struct mgsl_struct *info)
1885 unsigned long flags;
1887 spin_lock_irqsave(&info->irq_spinlock,flags);
1889 usc_stop_receiver(info);
1890 usc_stop_transmitter(info);
1891 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1893 if (info->params.mode == MGSL_MODE_HDLC ||
1894 info->params.mode == MGSL_MODE_RAW ||
1896 usc_set_sync_mode(info);
1898 usc_set_async_mode(info);
1900 usc_set_serial_signals(info);
1902 info->dcd_chkcount = 0;
1903 info->cts_chkcount = 0;
1904 info->ri_chkcount = 0;
1905 info->dsr_chkcount = 0;
1907 usc_EnableStatusIrqs(info,SICR_CTS+SICR_DSR+SICR_DCD+SICR_RI);
1908 usc_EnableInterrupts(info, IO_PIN);
1909 usc_get_serial_signals(info);
1911 if (info->netcount || info->tty->termios->c_cflag & CREAD)
1912 usc_start_receiver(info);
1914 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1917 /* Reconfigure adapter based on new parameters
1919 static void mgsl_change_params(struct mgsl_struct *info)
1924 if (!info->tty || !info->tty->termios)
1927 if (debug_level >= DEBUG_LEVEL_INFO)
1928 printk("%s(%d):mgsl_change_params(%s)\n",
1929 __FILE__,__LINE__, info->device_name );
1931 cflag = info->tty->termios->c_cflag;
1933 /* if B0 rate (hangup) specified then negate DTR and RTS */
1934 /* otherwise assert DTR and RTS */
1936 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1938 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1940 /* byte size and parity */
1942 switch (cflag & CSIZE) {
1943 case CS5: info->params.data_bits = 5; break;
1944 case CS6: info->params.data_bits = 6; break;
1945 case CS7: info->params.data_bits = 7; break;
1946 case CS8: info->params.data_bits = 8; break;
1947 /* Never happens, but GCC is too dumb to figure it out */
1948 default: info->params.data_bits = 7; break;
1952 info->params.stop_bits = 2;
1954 info->params.stop_bits = 1;
1956 info->params.parity = ASYNC_PARITY_NONE;
1957 if (cflag & PARENB) {
1959 info->params.parity = ASYNC_PARITY_ODD;
1961 info->params.parity = ASYNC_PARITY_EVEN;
1964 info->params.parity = ASYNC_PARITY_SPACE;
1968 /* calculate number of jiffies to transmit a full
1969 * FIFO (32 bytes) at specified data rate
1971 bits_per_char = info->params.data_bits +
1972 info->params.stop_bits + 1;
1974 /* if port data rate is set to 460800 or less then
1975 * allow tty settings to override, otherwise keep the
1976 * current data rate.
1978 if (info->params.data_rate <= 460800)
1979 info->params.data_rate = tty_get_baud_rate(info->tty);
1981 if ( info->params.data_rate ) {
1982 info->timeout = (32*HZ*bits_per_char) /
1983 info->params.data_rate;
1985 info->timeout += HZ/50; /* Add .02 seconds of slop */
1987 if (cflag & CRTSCTS)
1988 info->flags |= ASYNC_CTS_FLOW;
1990 info->flags &= ~ASYNC_CTS_FLOW;
1993 info->flags &= ~ASYNC_CHECK_CD;
1995 info->flags |= ASYNC_CHECK_CD;
1997 /* process tty input control flags */
1999 info->read_status_mask = RXSTATUS_OVERRUN;
2000 if (I_INPCK(info->tty))
2001 info->read_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
2002 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2003 info->read_status_mask |= RXSTATUS_BREAK_RECEIVED;
2005 if (I_IGNPAR(info->tty))
2006 info->ignore_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
2007 if (I_IGNBRK(info->tty)) {
2008 info->ignore_status_mask |= RXSTATUS_BREAK_RECEIVED;
2009 /* If ignoring parity and break indicators, ignore
2010 * overruns too. (For real raw support).
2012 if (I_IGNPAR(info->tty))
2013 info->ignore_status_mask |= RXSTATUS_OVERRUN;
2016 mgsl_program_hw(info);
2018 } /* end of mgsl_change_params() */
2022 * Add a character to the transmit buffer.
2024 * Arguments: tty pointer to tty information structure
2025 * ch character to add to transmit buffer
2027 * Return Value: None
2029 static void mgsl_put_char(struct tty_struct *tty, unsigned char ch)
2031 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2032 unsigned long flags;
2034 if ( debug_level >= DEBUG_LEVEL_INFO ) {
2035 printk( "%s(%d):mgsl_put_char(%d) on %s\n",
2036 __FILE__,__LINE__,ch,info->device_name);
2039 if (mgsl_paranoia_check(info, tty->name, "mgsl_put_char"))
2042 if (!tty || !info->xmit_buf)
2045 spin_lock_irqsave(&info->irq_spinlock,flags);
2047 if ( (info->params.mode == MGSL_MODE_ASYNC ) || !info->tx_active ) {
2049 if (info->xmit_cnt < SERIAL_XMIT_SIZE - 1) {
2050 info->xmit_buf[info->xmit_head++] = ch;
2051 info->xmit_head &= SERIAL_XMIT_SIZE-1;
2056 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2058 } /* end of mgsl_put_char() */
2060 /* mgsl_flush_chars()
2062 * Enable transmitter so remaining characters in the
2063 * transmit buffer are sent.
2065 * Arguments: tty pointer to tty information structure
2066 * Return Value: None
2068 static void mgsl_flush_chars(struct tty_struct *tty)
2070 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2071 unsigned long flags;
2073 if ( debug_level >= DEBUG_LEVEL_INFO )
2074 printk( "%s(%d):mgsl_flush_chars() entry on %s xmit_cnt=%d\n",
2075 __FILE__,__LINE__,info->device_name,info->xmit_cnt);
2077 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_chars"))
2080 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
2084 if ( debug_level >= DEBUG_LEVEL_INFO )
2085 printk( "%s(%d):mgsl_flush_chars() entry on %s starting transmitter\n",
2086 __FILE__,__LINE__,info->device_name );
2088 spin_lock_irqsave(&info->irq_spinlock,flags);
2090 if (!info->tx_active) {
2091 if ( (info->params.mode == MGSL_MODE_HDLC ||
2092 info->params.mode == MGSL_MODE_RAW) && info->xmit_cnt ) {
2093 /* operating in synchronous (frame oriented) mode */
2094 /* copy data from circular xmit_buf to */
2095 /* transmit DMA buffer. */
2096 mgsl_load_tx_dma_buffer(info,
2097 info->xmit_buf,info->xmit_cnt);
2099 usc_start_transmitter(info);
2102 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2104 } /* end of mgsl_flush_chars() */
2108 * Send a block of data
2112 * tty pointer to tty information structure
2113 * buf pointer to buffer containing send data
2114 * count size of send data in bytes
2116 * Return Value: number of characters written
2118 static int mgsl_write(struct tty_struct * tty,
2119 const unsigned char *buf, int count)
2122 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2123 unsigned long flags;
2125 if ( debug_level >= DEBUG_LEVEL_INFO )
2126 printk( "%s(%d):mgsl_write(%s) count=%d\n",
2127 __FILE__,__LINE__,info->device_name,count);
2129 if (mgsl_paranoia_check(info, tty->name, "mgsl_write"))
2132 if (!tty || !info->xmit_buf)
2135 if ( info->params.mode == MGSL_MODE_HDLC ||
2136 info->params.mode == MGSL_MODE_RAW ) {
2137 /* operating in synchronous (frame oriented) mode */
2138 /* operating in synchronous (frame oriented) mode */
2139 if (info->tx_active) {
2141 if ( info->params.mode == MGSL_MODE_HDLC ) {
2145 /* transmitter is actively sending data -
2146 * if we have multiple transmit dma and
2147 * holding buffers, attempt to queue this
2148 * frame for transmission at a later time.
2150 if (info->tx_holding_count >= info->num_tx_holding_buffers ) {
2151 /* no tx holding buffers available */
2156 /* queue transmit frame request */
2158 save_tx_buffer_request(info,buf,count);
2160 /* if we have sufficient tx dma buffers,
2161 * load the next buffered tx request
2163 spin_lock_irqsave(&info->irq_spinlock,flags);
2164 load_next_tx_holding_buffer(info);
2165 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2169 /* if operating in HDLC LoopMode and the adapter */
2170 /* has yet to be inserted into the loop, we can't */
2173 if ( (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) &&
2174 !usc_loopmode_active(info) )
2180 if ( info->xmit_cnt ) {
2181 /* Send accumulated from send_char() calls */
2182 /* as frame and wait before accepting more data. */
2185 /* copy data from circular xmit_buf to */
2186 /* transmit DMA buffer. */
2187 mgsl_load_tx_dma_buffer(info,
2188 info->xmit_buf,info->xmit_cnt);
2189 if ( debug_level >= DEBUG_LEVEL_INFO )
2190 printk( "%s(%d):mgsl_write(%s) sync xmit_cnt flushing\n",
2191 __FILE__,__LINE__,info->device_name);
2193 if ( debug_level >= DEBUG_LEVEL_INFO )
2194 printk( "%s(%d):mgsl_write(%s) sync transmit accepted\n",
2195 __FILE__,__LINE__,info->device_name);
2197 info->xmit_cnt = count;
2198 mgsl_load_tx_dma_buffer(info,buf,count);
2202 spin_lock_irqsave(&info->irq_spinlock,flags);
2203 c = min_t(int, count,
2204 min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
2205 SERIAL_XMIT_SIZE - info->xmit_head));
2207 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2210 memcpy(info->xmit_buf + info->xmit_head, buf, c);
2211 info->xmit_head = ((info->xmit_head + c) &
2212 (SERIAL_XMIT_SIZE-1));
2213 info->xmit_cnt += c;
2214 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2221 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
2222 spin_lock_irqsave(&info->irq_spinlock,flags);
2223 if (!info->tx_active)
2224 usc_start_transmitter(info);
2225 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2228 if ( debug_level >= DEBUG_LEVEL_INFO )
2229 printk( "%s(%d):mgsl_write(%s) returning=%d\n",
2230 __FILE__,__LINE__,info->device_name,ret);
2234 } /* end of mgsl_write() */
2236 /* mgsl_write_room()
2238 * Return the count of free bytes in transmit buffer
2240 * Arguments: tty pointer to tty info structure
2241 * Return Value: None
2243 static int mgsl_write_room(struct tty_struct *tty)
2245 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2248 if (mgsl_paranoia_check(info, tty->name, "mgsl_write_room"))
2250 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
2254 if (debug_level >= DEBUG_LEVEL_INFO)
2255 printk("%s(%d):mgsl_write_room(%s)=%d\n",
2256 __FILE__,__LINE__, info->device_name,ret );
2258 if ( info->params.mode == MGSL_MODE_HDLC ||
2259 info->params.mode == MGSL_MODE_RAW ) {
2260 /* operating in synchronous (frame oriented) mode */
2261 if ( info->tx_active )
2264 return HDLC_MAX_FRAME_SIZE;
2269 } /* end of mgsl_write_room() */
2271 /* mgsl_chars_in_buffer()
2273 * Return the count of bytes in transmit buffer
2275 * Arguments: tty pointer to tty info structure
2276 * Return Value: None
2278 static int mgsl_chars_in_buffer(struct tty_struct *tty)
2280 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2282 if (debug_level >= DEBUG_LEVEL_INFO)
2283 printk("%s(%d):mgsl_chars_in_buffer(%s)\n",
2284 __FILE__,__LINE__, info->device_name );
2286 if (mgsl_paranoia_check(info, tty->name, "mgsl_chars_in_buffer"))
2289 if (debug_level >= DEBUG_LEVEL_INFO)
2290 printk("%s(%d):mgsl_chars_in_buffer(%s)=%d\n",
2291 __FILE__,__LINE__, info->device_name,info->xmit_cnt );
2293 if ( info->params.mode == MGSL_MODE_HDLC ||
2294 info->params.mode == MGSL_MODE_RAW ) {
2295 /* operating in synchronous (frame oriented) mode */
2296 if ( info->tx_active )
2297 return info->max_frame_size;
2302 return info->xmit_cnt;
2303 } /* end of mgsl_chars_in_buffer() */
2305 /* mgsl_flush_buffer()
2307 * Discard all data in the send buffer
2309 * Arguments: tty pointer to tty info structure
2310 * Return Value: None
2312 static void mgsl_flush_buffer(struct tty_struct *tty)
2314 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2315 unsigned long flags;
2317 if (debug_level >= DEBUG_LEVEL_INFO)
2318 printk("%s(%d):mgsl_flush_buffer(%s) entry\n",
2319 __FILE__,__LINE__, info->device_name );
2321 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_buffer"))
2324 spin_lock_irqsave(&info->irq_spinlock,flags);
2325 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
2326 del_timer(&info->tx_timer);
2327 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2332 /* mgsl_send_xchar()
2334 * Send a high-priority XON/XOFF character
2336 * Arguments: tty pointer to tty info structure
2337 * ch character to send
2338 * Return Value: None
2340 static void mgsl_send_xchar(struct tty_struct *tty, char ch)
2342 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2343 unsigned long flags;
2345 if (debug_level >= DEBUG_LEVEL_INFO)
2346 printk("%s(%d):mgsl_send_xchar(%s,%d)\n",
2347 __FILE__,__LINE__, info->device_name, ch );
2349 if (mgsl_paranoia_check(info, tty->name, "mgsl_send_xchar"))
2354 /* Make sure transmit interrupts are on */
2355 spin_lock_irqsave(&info->irq_spinlock,flags);
2356 if (!info->tx_enabled)
2357 usc_start_transmitter(info);
2358 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2360 } /* end of mgsl_send_xchar() */
2364 * Signal remote device to throttle send data (our receive data)
2366 * Arguments: tty pointer to tty info structure
2367 * Return Value: None
2369 static void mgsl_throttle(struct tty_struct * tty)
2371 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2372 unsigned long flags;
2374 if (debug_level >= DEBUG_LEVEL_INFO)
2375 printk("%s(%d):mgsl_throttle(%s) entry\n",
2376 __FILE__,__LINE__, info->device_name );
2378 if (mgsl_paranoia_check(info, tty->name, "mgsl_throttle"))
2382 mgsl_send_xchar(tty, STOP_CHAR(tty));
2384 if (tty->termios->c_cflag & CRTSCTS) {
2385 spin_lock_irqsave(&info->irq_spinlock,flags);
2386 info->serial_signals &= ~SerialSignal_RTS;
2387 usc_set_serial_signals(info);
2388 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2390 } /* end of mgsl_throttle() */
2392 /* mgsl_unthrottle()
2394 * Signal remote device to stop throttling send data (our receive data)
2396 * Arguments: tty pointer to tty info structure
2397 * Return Value: None
2399 static void mgsl_unthrottle(struct tty_struct * tty)
2401 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2402 unsigned long flags;
2404 if (debug_level >= DEBUG_LEVEL_INFO)
2405 printk("%s(%d):mgsl_unthrottle(%s) entry\n",
2406 __FILE__,__LINE__, info->device_name );
2408 if (mgsl_paranoia_check(info, tty->name, "mgsl_unthrottle"))
2415 mgsl_send_xchar(tty, START_CHAR(tty));
2418 if (tty->termios->c_cflag & CRTSCTS) {
2419 spin_lock_irqsave(&info->irq_spinlock,flags);
2420 info->serial_signals |= SerialSignal_RTS;
2421 usc_set_serial_signals(info);
2422 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2425 } /* end of mgsl_unthrottle() */
2429 * get the current serial parameters information
2431 * Arguments: info pointer to device instance data
2432 * user_icount pointer to buffer to hold returned stats
2434 * Return Value: 0 if success, otherwise error code
2436 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount __user *user_icount)
2440 if (debug_level >= DEBUG_LEVEL_INFO)
2441 printk("%s(%d):mgsl_get_params(%s)\n",
2442 __FILE__,__LINE__, info->device_name);
2445 memset(&info->icount, 0, sizeof(info->icount));
2447 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2454 } /* end of mgsl_get_stats() */
2456 /* mgsl_get_params()
2458 * get the current serial parameters information
2460 * Arguments: info pointer to device instance data
2461 * user_params pointer to buffer to hold returned params
2463 * Return Value: 0 if success, otherwise error code
2465 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params)
2468 if (debug_level >= DEBUG_LEVEL_INFO)
2469 printk("%s(%d):mgsl_get_params(%s)\n",
2470 __FILE__,__LINE__, info->device_name);
2472 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2474 if ( debug_level >= DEBUG_LEVEL_INFO )
2475 printk( "%s(%d):mgsl_get_params(%s) user buffer copy failed\n",
2476 __FILE__,__LINE__,info->device_name);
2482 } /* end of mgsl_get_params() */
2484 /* mgsl_set_params()
2486 * set the serial parameters
2490 * info pointer to device instance data
2491 * new_params user buffer containing new serial params
2493 * Return Value: 0 if success, otherwise error code
2495 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params)
2497 unsigned long flags;
2498 MGSL_PARAMS tmp_params;
2501 if (debug_level >= DEBUG_LEVEL_INFO)
2502 printk("%s(%d):mgsl_set_params %s\n", __FILE__,__LINE__,
2503 info->device_name );
2504 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2506 if ( debug_level >= DEBUG_LEVEL_INFO )
2507 printk( "%s(%d):mgsl_set_params(%s) user buffer copy failed\n",
2508 __FILE__,__LINE__,info->device_name);
2512 spin_lock_irqsave(&info->irq_spinlock,flags);
2513 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2514 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2516 mgsl_change_params(info);
2520 } /* end of mgsl_set_params() */
2522 /* mgsl_get_txidle()
2524 * get the current transmit idle mode
2526 * Arguments: info pointer to device instance data
2527 * idle_mode pointer to buffer to hold returned idle mode
2529 * Return Value: 0 if success, otherwise error code
2531 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode)
2535 if (debug_level >= DEBUG_LEVEL_INFO)
2536 printk("%s(%d):mgsl_get_txidle(%s)=%d\n",
2537 __FILE__,__LINE__, info->device_name, info->idle_mode);
2539 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2541 if ( debug_level >= DEBUG_LEVEL_INFO )
2542 printk( "%s(%d):mgsl_get_txidle(%s) user buffer copy failed\n",
2543 __FILE__,__LINE__,info->device_name);
2549 } /* end of mgsl_get_txidle() */
2551 /* mgsl_set_txidle() service ioctl to set transmit idle mode
2553 * Arguments: info pointer to device instance data
2554 * idle_mode new idle mode
2556 * Return Value: 0 if success, otherwise error code
2558 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode)
2560 unsigned long flags;
2562 if (debug_level >= DEBUG_LEVEL_INFO)
2563 printk("%s(%d):mgsl_set_txidle(%s,%d)\n", __FILE__,__LINE__,
2564 info->device_name, idle_mode );
2566 spin_lock_irqsave(&info->irq_spinlock,flags);
2567 info->idle_mode = idle_mode;
2568 usc_set_txidle( info );
2569 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2572 } /* end of mgsl_set_txidle() */
2576 * enable or disable the transmitter
2580 * info pointer to device instance data
2581 * enable 1 = enable, 0 = disable
2583 * Return Value: 0 if success, otherwise error code
2585 static int mgsl_txenable(struct mgsl_struct * info, int enable)
2587 unsigned long flags;
2589 if (debug_level >= DEBUG_LEVEL_INFO)
2590 printk("%s(%d):mgsl_txenable(%s,%d)\n", __FILE__,__LINE__,
2591 info->device_name, enable);
2593 spin_lock_irqsave(&info->irq_spinlock,flags);
2595 if ( !info->tx_enabled ) {
2597 usc_start_transmitter(info);
2598 /*--------------------------------------------------
2599 * if HDLC/SDLC Loop mode, attempt to insert the
2600 * station in the 'loop' by setting CMR:13. Upon
2601 * receipt of the next GoAhead (RxAbort) sequence,
2602 * the OnLoop indicator (CCSR:7) should go active
2603 * to indicate that we are on the loop
2604 *--------------------------------------------------*/
2605 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2606 usc_loopmode_insert_request( info );
2609 if ( info->tx_enabled )
2610 usc_stop_transmitter(info);
2612 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2615 } /* end of mgsl_txenable() */
2617 /* mgsl_txabort() abort send HDLC frame
2619 * Arguments: info pointer to device instance data
2620 * Return Value: 0 if success, otherwise error code
2622 static int mgsl_txabort(struct mgsl_struct * info)
2624 unsigned long flags;
2626 if (debug_level >= DEBUG_LEVEL_INFO)
2627 printk("%s(%d):mgsl_txabort(%s)\n", __FILE__,__LINE__,
2630 spin_lock_irqsave(&info->irq_spinlock,flags);
2631 if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC )
2633 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2634 usc_loopmode_cancel_transmit( info );
2636 usc_TCmd(info,TCmd_SendAbort);
2638 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2641 } /* end of mgsl_txabort() */
2643 /* mgsl_rxenable() enable or disable the receiver
2645 * Arguments: info pointer to device instance data
2646 * enable 1 = enable, 0 = disable
2647 * Return Value: 0 if success, otherwise error code
2649 static int mgsl_rxenable(struct mgsl_struct * info, int enable)
2651 unsigned long flags;
2653 if (debug_level >= DEBUG_LEVEL_INFO)
2654 printk("%s(%d):mgsl_rxenable(%s,%d)\n", __FILE__,__LINE__,
2655 info->device_name, enable);
2657 spin_lock_irqsave(&info->irq_spinlock,flags);
2659 if ( !info->rx_enabled )
2660 usc_start_receiver(info);
2662 if ( info->rx_enabled )
2663 usc_stop_receiver(info);
2665 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2668 } /* end of mgsl_rxenable() */
2670 /* mgsl_wait_event() wait for specified event to occur
2672 * Arguments: info pointer to device instance data
2673 * mask pointer to bitmask of events to wait for
2674 * Return Value: 0 if successful and bit mask updated with
2675 * of events triggerred,
2676 * otherwise error code
2678 static int mgsl_wait_event(struct mgsl_struct * info, int __user * mask_ptr)
2680 unsigned long flags;
2683 struct mgsl_icount cprev, cnow;
2686 struct _input_signal_events oldsigs, newsigs;
2687 DECLARE_WAITQUEUE(wait, current);
2689 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
2694 if (debug_level >= DEBUG_LEVEL_INFO)
2695 printk("%s(%d):mgsl_wait_event(%s,%d)\n", __FILE__,__LINE__,
2696 info->device_name, mask);
2698 spin_lock_irqsave(&info->irq_spinlock,flags);
2700 /* return immediately if state matches requested events */
2701 usc_get_serial_signals(info);
2702 s = info->serial_signals;
2704 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2705 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2706 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2707 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2709 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2713 /* save current irq counts */
2714 cprev = info->icount;
2715 oldsigs = info->input_signal_events;
2717 /* enable hunt and idle irqs if needed */
2718 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2719 u16 oldreg = usc_InReg(info,RICR);
2720 u16 newreg = oldreg +
2721 (mask & MgslEvent_ExitHuntMode ? RXSTATUS_EXITED_HUNT:0) +
2722 (mask & MgslEvent_IdleReceived ? RXSTATUS_IDLE_RECEIVED:0);
2723 if (oldreg != newreg)
2724 usc_OutReg(info, RICR, newreg);
2727 set_current_state(TASK_INTERRUPTIBLE);
2728 add_wait_queue(&info->event_wait_q, &wait);
2730 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2735 if (signal_pending(current)) {
2740 /* get current irq counts */
2741 spin_lock_irqsave(&info->irq_spinlock,flags);
2742 cnow = info->icount;
2743 newsigs = info->input_signal_events;
2744 set_current_state(TASK_INTERRUPTIBLE);
2745 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2747 /* if no change, wait aborted for some reason */
2748 if (newsigs.dsr_up == oldsigs.dsr_up &&
2749 newsigs.dsr_down == oldsigs.dsr_down &&
2750 newsigs.dcd_up == oldsigs.dcd_up &&
2751 newsigs.dcd_down == oldsigs.dcd_down &&
2752 newsigs.cts_up == oldsigs.cts_up &&
2753 newsigs.cts_down == oldsigs.cts_down &&
2754 newsigs.ri_up == oldsigs.ri_up &&
2755 newsigs.ri_down == oldsigs.ri_down &&
2756 cnow.exithunt == cprev.exithunt &&
2757 cnow.rxidle == cprev.rxidle) {
2763 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2764 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2765 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2766 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2767 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2768 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2769 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2770 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2771 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2772 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2780 remove_wait_queue(&info->event_wait_q, &wait);
2781 set_current_state(TASK_RUNNING);
2783 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2784 spin_lock_irqsave(&info->irq_spinlock,flags);
2785 if (!waitqueue_active(&info->event_wait_q)) {
2786 /* disable enable exit hunt mode/idle rcvd IRQs */
2787 usc_OutReg(info, RICR, usc_InReg(info,RICR) &
2788 ~(RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED));
2790 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2794 PUT_USER(rc, events, mask_ptr);
2798 } /* end of mgsl_wait_event() */
2800 static int modem_input_wait(struct mgsl_struct *info,int arg)
2802 unsigned long flags;
2804 struct mgsl_icount cprev, cnow;
2805 DECLARE_WAITQUEUE(wait, current);
2807 /* save current irq counts */
2808 spin_lock_irqsave(&info->irq_spinlock,flags);
2809 cprev = info->icount;
2810 add_wait_queue(&info->status_event_wait_q, &wait);
2811 set_current_state(TASK_INTERRUPTIBLE);
2812 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2816 if (signal_pending(current)) {
2821 /* get new irq counts */
2822 spin_lock_irqsave(&info->irq_spinlock,flags);
2823 cnow = info->icount;
2824 set_current_state(TASK_INTERRUPTIBLE);
2825 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2827 /* if no change, wait aborted for some reason */
2828 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2829 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2834 /* check for change in caller specified modem input */
2835 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2836 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2837 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2838 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2845 remove_wait_queue(&info->status_event_wait_q, &wait);
2846 set_current_state(TASK_RUNNING);
2850 /* return the state of the serial control and status signals
2852 static int tiocmget(struct tty_struct *tty, struct file *file)
2854 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2855 unsigned int result;
2856 unsigned long flags;
2858 spin_lock_irqsave(&info->irq_spinlock,flags);
2859 usc_get_serial_signals(info);
2860 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2862 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2863 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2864 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2865 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
2866 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2867 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2869 if (debug_level >= DEBUG_LEVEL_INFO)
2870 printk("%s(%d):%s tiocmget() value=%08X\n",
2871 __FILE__,__LINE__, info->device_name, result );
2875 /* set modem control signals (DTR/RTS)
2877 static int tiocmset(struct tty_struct *tty, struct file *file,
2878 unsigned int set, unsigned int clear)
2880 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2881 unsigned long flags;
2883 if (debug_level >= DEBUG_LEVEL_INFO)
2884 printk("%s(%d):%s tiocmset(%x,%x)\n",
2885 __FILE__,__LINE__,info->device_name, set, clear);
2887 if (set & TIOCM_RTS)
2888 info->serial_signals |= SerialSignal_RTS;
2889 if (set & TIOCM_DTR)
2890 info->serial_signals |= SerialSignal_DTR;
2891 if (clear & TIOCM_RTS)
2892 info->serial_signals &= ~SerialSignal_RTS;
2893 if (clear & TIOCM_DTR)
2894 info->serial_signals &= ~SerialSignal_DTR;
2896 spin_lock_irqsave(&info->irq_spinlock,flags);
2897 usc_set_serial_signals(info);
2898 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2903 /* mgsl_break() Set or clear transmit break condition
2905 * Arguments: tty pointer to tty instance data
2906 * break_state -1=set break condition, 0=clear
2907 * Return Value: None
2909 static void mgsl_break(struct tty_struct *tty, int break_state)
2911 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
2912 unsigned long flags;
2914 if (debug_level >= DEBUG_LEVEL_INFO)
2915 printk("%s(%d):mgsl_break(%s,%d)\n",
2916 __FILE__,__LINE__, info->device_name, break_state);
2918 if (mgsl_paranoia_check(info, tty->name, "mgsl_break"))
2921 spin_lock_irqsave(&info->irq_spinlock,flags);
2922 if (break_state == -1)
2923 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) | BIT7));
2925 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) & ~BIT7));
2926 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2928 } /* end of mgsl_break() */
2930 /* mgsl_ioctl() Service an IOCTL request
2934 * tty pointer to tty instance data
2935 * file pointer to associated file object for device
2936 * cmd IOCTL command code
2937 * arg command argument/context
2939 * Return Value: 0 if success, otherwise error code
2941 static int mgsl_ioctl(struct tty_struct *tty, struct file * file,
2942 unsigned int cmd, unsigned long arg)
2944 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
2947 if (debug_level >= DEBUG_LEVEL_INFO)
2948 printk("%s(%d):mgsl_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2949 info->device_name, cmd );
2951 if (mgsl_paranoia_check(info, tty->name, "mgsl_ioctl"))
2954 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2955 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
2956 if (tty->flags & (1 << TTY_IO_ERROR))
2961 ret = mgsl_ioctl_common(info, cmd, arg);
2966 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg)
2969 struct mgsl_icount cnow; /* kernel counter temps */
2970 void __user *argp = (void __user *)arg;
2971 struct serial_icounter_struct __user *p_cuser; /* user space */
2972 unsigned long flags;
2975 case MGSL_IOCGPARAMS:
2976 return mgsl_get_params(info, argp);
2977 case MGSL_IOCSPARAMS:
2978 return mgsl_set_params(info, argp);
2979 case MGSL_IOCGTXIDLE:
2980 return mgsl_get_txidle(info, argp);
2981 case MGSL_IOCSTXIDLE:
2982 return mgsl_set_txidle(info,(int)arg);
2983 case MGSL_IOCTXENABLE:
2984 return mgsl_txenable(info,(int)arg);
2985 case MGSL_IOCRXENABLE:
2986 return mgsl_rxenable(info,(int)arg);
2987 case MGSL_IOCTXABORT:
2988 return mgsl_txabort(info);
2989 case MGSL_IOCGSTATS:
2990 return mgsl_get_stats(info, argp);
2991 case MGSL_IOCWAITEVENT:
2992 return mgsl_wait_event(info, argp);
2993 case MGSL_IOCLOOPTXDONE:
2994 return mgsl_loopmode_send_done(info);
2995 /* Wait for modem input (DCD,RI,DSR,CTS) change
2996 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
2999 return modem_input_wait(info,(int)arg);
3002 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
3003 * Return: write counters to the user passed counter struct
3004 * NB: both 1->0 and 0->1 transitions are counted except for
3005 * RI where only 0->1 is counted.
3008 spin_lock_irqsave(&info->irq_spinlock,flags);
3009 cnow = info->icount;
3010 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3012 PUT_USER(error,cnow.cts, &p_cuser->cts);
3013 if (error) return error;
3014 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
3015 if (error) return error;
3016 PUT_USER(error,cnow.rng, &p_cuser->rng);
3017 if (error) return error;
3018 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
3019 if (error) return error;
3020 PUT_USER(error,cnow.rx, &p_cuser->rx);
3021 if (error) return error;
3022 PUT_USER(error,cnow.tx, &p_cuser->tx);
3023 if (error) return error;
3024 PUT_USER(error,cnow.frame, &p_cuser->frame);
3025 if (error) return error;
3026 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
3027 if (error) return error;
3028 PUT_USER(error,cnow.parity, &p_cuser->parity);
3029 if (error) return error;
3030 PUT_USER(error,cnow.brk, &p_cuser->brk);
3031 if (error) return error;
3032 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
3033 if (error) return error;
3036 return -ENOIOCTLCMD;
3041 /* mgsl_set_termios()
3043 * Set new termios settings
3047 * tty pointer to tty structure
3048 * termios pointer to buffer to hold returned old termios
3050 * Return Value: None
3052 static void mgsl_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
3054 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
3055 unsigned long flags;
3057 if (debug_level >= DEBUG_LEVEL_INFO)
3058 printk("%s(%d):mgsl_set_termios %s\n", __FILE__,__LINE__,
3059 tty->driver->name );
3061 mgsl_change_params(info);
3063 /* Handle transition to B0 status */
3064 if (old_termios->c_cflag & CBAUD &&
3065 !(tty->termios->c_cflag & CBAUD)) {
3066 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3067 spin_lock_irqsave(&info->irq_spinlock,flags);
3068 usc_set_serial_signals(info);
3069 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3072 /* Handle transition away from B0 status */
3073 if (!(old_termios->c_cflag & CBAUD) &&
3074 tty->termios->c_cflag & CBAUD) {
3075 info->serial_signals |= SerialSignal_DTR;
3076 if (!(tty->termios->c_cflag & CRTSCTS) ||
3077 !test_bit(TTY_THROTTLED, &tty->flags)) {
3078 info->serial_signals |= SerialSignal_RTS;
3080 spin_lock_irqsave(&info->irq_spinlock,flags);
3081 usc_set_serial_signals(info);
3082 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3085 /* Handle turning off CRTSCTS */
3086 if (old_termios->c_cflag & CRTSCTS &&
3087 !(tty->termios->c_cflag & CRTSCTS)) {
3088 tty->hw_stopped = 0;
3092 } /* end of mgsl_set_termios() */
3096 * Called when port is closed. Wait for remaining data to be
3097 * sent. Disable port and free resources.
3101 * tty pointer to open tty structure
3102 * filp pointer to open file object
3104 * Return Value: None
3106 static void mgsl_close(struct tty_struct *tty, struct file * filp)
3108 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3110 if (mgsl_paranoia_check(info, tty->name, "mgsl_close"))
3113 if (debug_level >= DEBUG_LEVEL_INFO)
3114 printk("%s(%d):mgsl_close(%s) entry, count=%d\n",
3115 __FILE__,__LINE__, info->device_name, info->count);
3120 if (tty_hung_up_p(filp))
3123 if ((tty->count == 1) && (info->count != 1)) {
3125 * tty->count is 1 and the tty structure will be freed.
3126 * info->count should be one in this case.
3127 * if it's not, correct it so that the port is shutdown.
3129 printk("mgsl_close: bad refcount; tty->count is 1, "
3130 "info->count is %d\n", info->count);
3136 /* if at least one open remaining, leave hardware active */
3140 info->flags |= ASYNC_CLOSING;
3142 /* set tty->closing to notify line discipline to
3143 * only process XON/XOFF characters. Only the N_TTY
3144 * discipline appears to use this (ppp does not).
3148 /* wait for transmit data to clear all layers */
3150 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
3151 if (debug_level >= DEBUG_LEVEL_INFO)
3152 printk("%s(%d):mgsl_close(%s) calling tty_wait_until_sent\n",
3153 __FILE__,__LINE__, info->device_name );
3154 tty_wait_until_sent(tty, info->closing_wait);
3157 if (info->flags & ASYNC_INITIALIZED)
3158 mgsl_wait_until_sent(tty, info->timeout);
3160 if (tty->driver->flush_buffer)
3161 tty->driver->flush_buffer(tty);
3163 tty_ldisc_flush(tty);
3170 if (info->blocked_open) {
3171 if (info->close_delay) {
3172 msleep_interruptible(jiffies_to_msecs(info->close_delay));
3174 wake_up_interruptible(&info->open_wait);
3177 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
3179 wake_up_interruptible(&info->close_wait);
3182 if (debug_level >= DEBUG_LEVEL_INFO)
3183 printk("%s(%d):mgsl_close(%s) exit, count=%d\n", __FILE__,__LINE__,
3184 tty->driver->name, info->count);
3186 } /* end of mgsl_close() */
3188 /* mgsl_wait_until_sent()
3190 * Wait until the transmitter is empty.
3194 * tty pointer to tty info structure
3195 * timeout time to wait for send completion
3197 * Return Value: None
3199 static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout)
3201 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3202 unsigned long orig_jiffies, char_time;
3207 if (debug_level >= DEBUG_LEVEL_INFO)
3208 printk("%s(%d):mgsl_wait_until_sent(%s) entry\n",
3209 __FILE__,__LINE__, info->device_name );
3211 if (mgsl_paranoia_check(info, tty->name, "mgsl_wait_until_sent"))
3214 if (!(info->flags & ASYNC_INITIALIZED))
3217 orig_jiffies = jiffies;
3219 /* Set check interval to 1/5 of estimated time to
3220 * send a character, and make it at least 1. The check
3221 * interval should also be less than the timeout.
3222 * Note: use tight timings here to satisfy the NIST-PCTS.
3225 if ( info->params.data_rate ) {
3226 char_time = info->timeout/(32 * 5);
3233 char_time = min_t(unsigned long, char_time, timeout);
3235 if ( info->params.mode == MGSL_MODE_HDLC ||
3236 info->params.mode == MGSL_MODE_RAW ) {
3237 while (info->tx_active) {
3238 msleep_interruptible(jiffies_to_msecs(char_time));
3239 if (signal_pending(current))
3241 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3245 while (!(usc_InReg(info,TCSR) & TXSTATUS_ALL_SENT) &&
3247 msleep_interruptible(jiffies_to_msecs(char_time));
3248 if (signal_pending(current))
3250 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3256 if (debug_level >= DEBUG_LEVEL_INFO)
3257 printk("%s(%d):mgsl_wait_until_sent(%s) exit\n",
3258 __FILE__,__LINE__, info->device_name );
3260 } /* end of mgsl_wait_until_sent() */
3264 * Called by tty_hangup() when a hangup is signaled.
3265 * This is the same as to closing all open files for the port.
3267 * Arguments: tty pointer to associated tty object
3268 * Return Value: None
3270 static void mgsl_hangup(struct tty_struct *tty)
3272 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3274 if (debug_level >= DEBUG_LEVEL_INFO)
3275 printk("%s(%d):mgsl_hangup(%s)\n",
3276 __FILE__,__LINE__, info->device_name );
3278 if (mgsl_paranoia_check(info, tty->name, "mgsl_hangup"))
3281 mgsl_flush_buffer(tty);
3285 info->flags &= ~ASYNC_NORMAL_ACTIVE;
3288 wake_up_interruptible(&info->open_wait);
3290 } /* end of mgsl_hangup() */
3292 /* block_til_ready()
3294 * Block the current process until the specified port
3295 * is ready to be opened.
3299 * tty pointer to tty info structure
3300 * filp pointer to open file object
3301 * info pointer to device instance data
3303 * Return Value: 0 if success, otherwise error code
3305 static int block_til_ready(struct tty_struct *tty, struct file * filp,
3306 struct mgsl_struct *info)
3308 DECLARE_WAITQUEUE(wait, current);
3310 bool do_clocal = false;
3311 bool extra_count = false;
3312 unsigned long flags;
3314 if (debug_level >= DEBUG_LEVEL_INFO)
3315 printk("%s(%d):block_til_ready on %s\n",
3316 __FILE__,__LINE__, tty->driver->name );
3318 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3319 /* nonblock mode is set or port is not enabled */
3320 info->flags |= ASYNC_NORMAL_ACTIVE;
3324 if (tty->termios->c_cflag & CLOCAL)
3327 /* Wait for carrier detect and the line to become
3328 * free (i.e., not in use by the callout). While we are in
3329 * this loop, info->count is dropped by one, so that
3330 * mgsl_close() knows when to free things. We restore it upon
3331 * exit, either normal or abnormal.
3335 add_wait_queue(&info->open_wait, &wait);
3337 if (debug_level >= DEBUG_LEVEL_INFO)
3338 printk("%s(%d):block_til_ready before block on %s count=%d\n",
3339 __FILE__,__LINE__, tty->driver->name, info->count );
3341 spin_lock_irqsave(&info->irq_spinlock, flags);
3342 if (!tty_hung_up_p(filp)) {
3346 spin_unlock_irqrestore(&info->irq_spinlock, flags);
3347 info->blocked_open++;
3350 if (tty->termios->c_cflag & CBAUD) {
3351 spin_lock_irqsave(&info->irq_spinlock,flags);
3352 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3353 usc_set_serial_signals(info);
3354 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3357 set_current_state(TASK_INTERRUPTIBLE);
3359 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
3360 retval = (info->flags & ASYNC_HUP_NOTIFY) ?
3361 -EAGAIN : -ERESTARTSYS;
3365 spin_lock_irqsave(&info->irq_spinlock,flags);
3366 usc_get_serial_signals(info);
3367 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3369 if (!(info->flags & ASYNC_CLOSING) &&
3370 (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
3374 if (signal_pending(current)) {
3375 retval = -ERESTARTSYS;
3379 if (debug_level >= DEBUG_LEVEL_INFO)
3380 printk("%s(%d):block_til_ready blocking on %s count=%d\n",
3381 __FILE__,__LINE__, tty->driver->name, info->count );
3386 set_current_state(TASK_RUNNING);
3387 remove_wait_queue(&info->open_wait, &wait);
3391 info->blocked_open--;
3393 if (debug_level >= DEBUG_LEVEL_INFO)
3394 printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
3395 __FILE__,__LINE__, tty->driver->name, info->count );
3398 info->flags |= ASYNC_NORMAL_ACTIVE;
3402 } /* end of block_til_ready() */
3406 * Called when a port is opened. Init and enable port.
3407 * Perform serial-specific initialization for the tty structure.
3409 * Arguments: tty pointer to tty info structure
3410 * filp associated file pointer
3412 * Return Value: 0 if success, otherwise error code
3414 static int mgsl_open(struct tty_struct *tty, struct file * filp)
3416 struct mgsl_struct *info;
3418 unsigned long flags;
3420 /* verify range of specified line number */
3422 if ((line < 0) || (line >= mgsl_device_count)) {
3423 printk("%s(%d):mgsl_open with invalid line #%d.\n",
3424 __FILE__,__LINE__,line);
3428 /* find the info structure for the specified line */
3429 info = mgsl_device_list;
3430 while(info && info->line != line)
3431 info = info->next_device;
3432 if (mgsl_paranoia_check(info, tty->name, "mgsl_open"))
3435 tty->driver_data = info;
3438 if (debug_level >= DEBUG_LEVEL_INFO)
3439 printk("%s(%d):mgsl_open(%s), old ref count = %d\n",
3440 __FILE__,__LINE__,tty->driver->name, info->count);
3442 /* If port is closing, signal caller to try again */
3443 if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
3444 if (info->flags & ASYNC_CLOSING)
3445 interruptible_sleep_on(&info->close_wait);
3446 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
3447 -EAGAIN : -ERESTARTSYS);
3451 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
3453 spin_lock_irqsave(&info->netlock, flags);
3454 if (info->netcount) {
3456 spin_unlock_irqrestore(&info->netlock, flags);
3460 spin_unlock_irqrestore(&info->netlock, flags);
3462 if (info->count == 1) {
3463 /* 1st open on this device, init hardware */
3464 retval = startup(info);
3469 retval = block_til_ready(tty, filp, info);
3471 if (debug_level >= DEBUG_LEVEL_INFO)
3472 printk("%s(%d):block_til_ready(%s) returned %d\n",
3473 __FILE__,__LINE__, info->device_name, retval);
3477 if (debug_level >= DEBUG_LEVEL_INFO)
3478 printk("%s(%d):mgsl_open(%s) success\n",
3479 __FILE__,__LINE__, info->device_name);
3484 if (tty->count == 1)
3485 info->tty = NULL; /* tty layer will release tty struct */
3492 } /* end of mgsl_open() */
3495 * /proc fs routines....
3498 static inline int line_info(char *buf, struct mgsl_struct *info)
3502 unsigned long flags;
3504 if (info->bus_type == MGSL_BUS_TYPE_PCI) {
3505 ret = sprintf(buf, "%s:PCI io:%04X irq:%d mem:%08X lcr:%08X",
3506 info->device_name, info->io_base, info->irq_level,
3507 info->phys_memory_base, info->phys_lcr_base);
3509 ret = sprintf(buf, "%s:(E)ISA io:%04X irq:%d dma:%d",
3510 info->device_name, info->io_base,
3511 info->irq_level, info->dma_level);
3514 /* output current serial signal states */
3515 spin_lock_irqsave(&info->irq_spinlock,flags);
3516 usc_get_serial_signals(info);
3517 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3521 if (info->serial_signals & SerialSignal_RTS)
3522 strcat(stat_buf, "|RTS");
3523 if (info->serial_signals & SerialSignal_CTS)
3524 strcat(stat_buf, "|CTS");
3525 if (info->serial_signals & SerialSignal_DTR)
3526 strcat(stat_buf, "|DTR");
3527 if (info->serial_signals & SerialSignal_DSR)
3528 strcat(stat_buf, "|DSR");
3529 if (info->serial_signals & SerialSignal_DCD)
3530 strcat(stat_buf, "|CD");
3531 if (info->serial_signals & SerialSignal_RI)
3532 strcat(stat_buf, "|RI");
3534 if (info->params.mode == MGSL_MODE_HDLC ||
3535 info->params.mode == MGSL_MODE_RAW ) {
3536 ret += sprintf(buf+ret, " HDLC txok:%d rxok:%d",
3537 info->icount.txok, info->icount.rxok);
3538 if (info->icount.txunder)
3539 ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
3540 if (info->icount.txabort)
3541 ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
3542 if (info->icount.rxshort)
3543 ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
3544 if (info->icount.rxlong)
3545 ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
3546 if (info->icount.rxover)
3547 ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
3548 if (info->icount.rxcrc)
3549 ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
3551 ret += sprintf(buf+ret, " ASYNC tx:%d rx:%d",
3552 info->icount.tx, info->icount.rx);
3553 if (info->icount.frame)
3554 ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
3555 if (info->icount.parity)
3556 ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
3557 if (info->icount.brk)
3558 ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
3559 if (info->icount.overrun)
3560 ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
3563 /* Append serial signal status to end */
3564 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
3566 ret += sprintf(buf+ret, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
3567 info->tx_active,info->bh_requested,info->bh_running,
3570 spin_lock_irqsave(&info->irq_spinlock,flags);
3572 u16 Tcsr = usc_InReg( info, TCSR );
3573 u16 Tdmr = usc_InDmaReg( info, TDMR );
3574 u16 Ticr = usc_InReg( info, TICR );
3575 u16 Rscr = usc_InReg( info, RCSR );
3576 u16 Rdmr = usc_InDmaReg( info, RDMR );
3577 u16 Ricr = usc_InReg( info, RICR );
3578 u16 Icr = usc_InReg( info, ICR );
3579 u16 Dccr = usc_InReg( info, DCCR );
3580 u16 Tmr = usc_InReg( info, TMR );
3581 u16 Tccr = usc_InReg( info, TCCR );
3582 u16 Ccar = inw( info->io_base + CCAR );
3583 ret += sprintf(buf+ret, "tcsr=%04X tdmr=%04X ticr=%04X rcsr=%04X rdmr=%04X\n"
3584 "ricr=%04X icr =%04X dccr=%04X tmr=%04X tccr=%04X ccar=%04X\n",
3585 Tcsr,Tdmr,Ticr,Rscr,Rdmr,Ricr,Icr,Dccr,Tmr,Tccr,Ccar );
3587 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3591 } /* end of line_info() */
3595 * Called to print information about devices
3598 * page page of memory to hold returned info
3607 static int mgsl_read_proc(char *page, char **start, off_t off, int count,
3608 int *eof, void *data)
3612 struct mgsl_struct *info;
3614 len += sprintf(page, "synclink driver:%s\n", driver_version);
3616 info = mgsl_device_list;
3618 l = line_info(page + len, info);
3620 if (len+begin > off+count)
3622 if (len+begin < off) {
3626 info = info->next_device;
3631 if (off >= len+begin)
3633 *start = page + (off-begin);
3634 return ((count < begin+len-off) ? count : begin+len-off);
3636 } /* end of mgsl_read_proc() */
3638 /* mgsl_allocate_dma_buffers()
3640 * Allocate and format DMA buffers (ISA adapter)
3641 * or format shared memory buffers (PCI adapter).
3643 * Arguments: info pointer to device instance data
3644 * Return Value: 0 if success, otherwise error
3646 static int mgsl_allocate_dma_buffers(struct mgsl_struct *info)
3648 unsigned short BuffersPerFrame;
3650 info->last_mem_alloc = 0;
3652 /* Calculate the number of DMA buffers necessary to hold the */
3653 /* largest allowable frame size. Note: If the max frame size is */
3654 /* not an even multiple of the DMA buffer size then we need to */
3655 /* round the buffer count per frame up one. */
3657 BuffersPerFrame = (unsigned short)(info->max_frame_size/DMABUFFERSIZE);
3658 if ( info->max_frame_size % DMABUFFERSIZE )
3661 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3663 * The PCI adapter has 256KBytes of shared memory to use.
3664 * This is 64 PAGE_SIZE buffers.
3666 * The first page is used for padding at this time so the
3667 * buffer list does not begin at offset 0 of the PCI
3668 * adapter's shared memory.
3670 * The 2nd page is used for the buffer list. A 4K buffer
3671 * list can hold 128 DMA_BUFFER structures at 32 bytes
3674 * This leaves 62 4K pages.
3676 * The next N pages are used for transmit frame(s). We
3677 * reserve enough 4K page blocks to hold the required
3678 * number of transmit dma buffers (num_tx_dma_buffers),
3679 * each of MaxFrameSize size.
3681 * Of the remaining pages (62-N), determine how many can
3682 * be used to receive full MaxFrameSize inbound frames
3684 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3685 info->rx_buffer_count = 62 - info->tx_buffer_count;
3687 /* Calculate the number of PAGE_SIZE buffers needed for */
3688 /* receive and transmit DMA buffers. */
3691 /* Calculate the number of DMA buffers necessary to */
3692 /* hold 7 max size receive frames and one max size transmit frame. */
3693 /* The receive buffer count is bumped by one so we avoid an */
3694 /* End of List condition if all receive buffers are used when */
3695 /* using linked list DMA buffers. */
3697 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3698 info->rx_buffer_count = (BuffersPerFrame * MAXRXFRAMES) + 6;
3701 * limit total TxBuffers & RxBuffers to 62 4K total
3702 * (ala PCI Allocation)
3705 if ( (info->tx_buffer_count + info->rx_buffer_count) > 62 )
3706 info->rx_buffer_count = 62 - info->tx_buffer_count;
3710 if ( debug_level >= DEBUG_LEVEL_INFO )
3711 printk("%s(%d):Allocating %d TX and %d RX DMA buffers.\n",
3712 __FILE__,__LINE__, info->tx_buffer_count,info->rx_buffer_count);
3714 if ( mgsl_alloc_buffer_list_memory( info ) < 0 ||
3715 mgsl_alloc_frame_memory(info, info->rx_buffer_list, info->rx_buffer_count) < 0 ||
3716 mgsl_alloc_frame_memory(info, info->tx_buffer_list, info->tx_buffer_count) < 0 ||
3717 mgsl_alloc_intermediate_rxbuffer_memory(info) < 0 ||
3718 mgsl_alloc_intermediate_txbuffer_memory(info) < 0 ) {
3719 printk("%s(%d):Can't allocate DMA buffer memory\n",__FILE__,__LINE__);
3723 mgsl_reset_rx_dma_buffers( info );
3724 mgsl_reset_tx_dma_buffers( info );
3728 } /* end of mgsl_allocate_dma_buffers() */
3731 * mgsl_alloc_buffer_list_memory()
3733 * Allocate a common DMA buffer for use as the
3734 * receive and transmit buffer lists.
3736 * A buffer list is a set of buffer entries where each entry contains
3737 * a pointer to an actual buffer and a pointer to the next buffer entry
3738 * (plus some other info about the buffer).
3740 * The buffer entries for a list are built to form a circular list so
3741 * that when the entire list has been traversed you start back at the
3744 * This function allocates memory for just the buffer entries.
3745 * The links (pointer to next entry) are filled in with the physical
3746 * address of the next entry so the adapter can navigate the list
3747 * using bus master DMA. The pointers to the actual buffers are filled
3748 * out later when the actual buffers are allocated.
3750 * Arguments: info pointer to device instance data
3751 * Return Value: 0 if success, otherwise error
3753 static int mgsl_alloc_buffer_list_memory( struct mgsl_struct *info )
3757 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3758 /* PCI adapter uses shared memory. */
3759 info->buffer_list = info->memory_base + info->last_mem_alloc;
3760 info->buffer_list_phys = info->last_mem_alloc;
3761 info->last_mem_alloc += BUFFERLISTSIZE;
3763 /* ISA adapter uses system memory. */
3764 /* The buffer lists are allocated as a common buffer that both */
3765 /* the processor and adapter can access. This allows the driver to */
3766 /* inspect portions of the buffer while other portions are being */
3767 /* updated by the adapter using Bus Master DMA. */
3769 info->buffer_list = dma_alloc_coherent(NULL, BUFFERLISTSIZE, &info->buffer_list_dma_addr, GFP_KERNEL);
3770 if (info->buffer_list == NULL)
3772 info->buffer_list_phys = (u32)(info->buffer_list_dma_addr);
3775 /* We got the memory for the buffer entry lists. */
3776 /* Initialize the memory block to all zeros. */
3777 memset( info->buffer_list, 0, BUFFERLISTSIZE );
3779 /* Save virtual address pointers to the receive and */
3780 /* transmit buffer lists. (Receive 1st). These pointers will */
3781 /* be used by the processor to access the lists. */
3782 info->rx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3783 info->tx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3784 info->tx_buffer_list += info->rx_buffer_count;
3787 * Build the links for the buffer entry lists such that
3788 * two circular lists are built. (Transmit and Receive).
3790 * Note: the links are physical addresses
3791 * which are read by the adapter to determine the next
3792 * buffer entry to use.
3795 for ( i = 0; i < info->rx_buffer_count; i++ ) {
3796 /* calculate and store physical address of this buffer entry */
3797 info->rx_buffer_list[i].phys_entry =
3798 info->buffer_list_phys + (i * sizeof(DMABUFFERENTRY));
3800 /* calculate and store physical address of */
3801 /* next entry in cirular list of entries */
3803 info->rx_buffer_list[i].link = info->buffer_list_phys;
3805 if ( i < info->rx_buffer_count - 1 )
3806 info->rx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3809 for ( i = 0; i < info->tx_buffer_count; i++ ) {
3810 /* calculate and store physical address of this buffer entry */
3811 info->tx_buffer_list[i].phys_entry = info->buffer_list_phys +
3812 ((info->rx_buffer_count + i) * sizeof(DMABUFFERENTRY));
3814 /* calculate and store physical address of */
3815 /* next entry in cirular list of entries */
3817 info->tx_buffer_list[i].link = info->buffer_list_phys +
3818 info->rx_buffer_count * sizeof(DMABUFFERENTRY);
3820 if ( i < info->tx_buffer_count - 1 )
3821 info->tx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3826 } /* end of mgsl_alloc_buffer_list_memory() */
3828 /* Free DMA buffers allocated for use as the
3829 * receive and transmit buffer lists.
3832 * The data transfer buffers associated with the buffer list
3833 * MUST be freed before freeing the buffer list itself because
3834 * the buffer list contains the information necessary to free
3835 * the individual buffers!
3837 static void mgsl_free_buffer_list_memory( struct mgsl_struct *info )
3839 if (info->buffer_list && info->bus_type != MGSL_BUS_TYPE_PCI)
3840 dma_free_coherent(NULL, BUFFERLISTSIZE, info->buffer_list, info->buffer_list_dma_addr);
3842 info->buffer_list = NULL;
3843 info->rx_buffer_list = NULL;
3844 info->tx_buffer_list = NULL;
3846 } /* end of mgsl_free_buffer_list_memory() */
3849 * mgsl_alloc_frame_memory()
3851 * Allocate the frame DMA buffers used by the specified buffer list.
3852 * Each DMA buffer will be one memory page in size. This is necessary
3853 * because memory can fragment enough that it may be impossible
3858 * info pointer to device instance data
3859 * BufferList pointer to list of buffer entries
3860 * Buffercount count of buffer entries in buffer list
3862 * Return Value: 0 if success, otherwise -ENOMEM
3864 static int mgsl_alloc_frame_memory(struct mgsl_struct *info,DMABUFFERENTRY *BufferList,int Buffercount)
3869 /* Allocate page sized buffers for the receive buffer list */
3871 for ( i = 0; i < Buffercount; i++ ) {
3872 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3873 /* PCI adapter uses shared memory buffers. */
3874 BufferList[i].virt_addr = info->memory_base + info->last_mem_alloc;
3875 phys_addr = info->last_mem_alloc;
3876 info->last_mem_alloc += DMABUFFERSIZE;
3878 /* ISA adapter uses system memory. */
3879 BufferList[i].virt_addr = dma_alloc_coherent(NULL, DMABUFFERSIZE, &BufferList[i].dma_addr, GFP_KERNEL);
3880 if (BufferList[i].virt_addr == NULL)
3882 phys_addr = (u32)(BufferList[i].dma_addr);
3884 BufferList[i].phys_addr = phys_addr;
3889 } /* end of mgsl_alloc_frame_memory() */
3892 * mgsl_free_frame_memory()
3894 * Free the buffers associated with
3895 * each buffer entry of a buffer list.
3899 * info pointer to device instance data
3900 * BufferList pointer to list of buffer entries
3901 * Buffercount count of buffer entries in buffer list
3903 * Return Value: None
3905 static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList, int Buffercount)
3910 for ( i = 0 ; i < Buffercount ; i++ ) {
3911 if ( BufferList[i].virt_addr ) {
3912 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
3913 dma_free_coherent(NULL, DMABUFFERSIZE, BufferList[i].virt_addr, BufferList[i].dma_addr);
3914 BufferList[i].virt_addr = NULL;
3919 } /* end of mgsl_free_frame_memory() */
3921 /* mgsl_free_dma_buffers()
3925 * Arguments: info pointer to device instance data
3926 * Return Value: None
3928 static void mgsl_free_dma_buffers( struct mgsl_struct *info )
3930 mgsl_free_frame_memory( info, info->rx_buffer_list, info->rx_buffer_count );
3931 mgsl_free_frame_memory( info, info->tx_buffer_list, info->tx_buffer_count );
3932 mgsl_free_buffer_list_memory( info );
3934 } /* end of mgsl_free_dma_buffers() */
3938 * mgsl_alloc_intermediate_rxbuffer_memory()
3940 * Allocate a buffer large enough to hold max_frame_size. This buffer
3941 * is used to pass an assembled frame to the line discipline.
3945 * info pointer to device instance data
3947 * Return Value: 0 if success, otherwise -ENOMEM
3949 static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info)
3951 info->intermediate_rxbuffer = kmalloc(info->max_frame_size, GFP_KERNEL | GFP_DMA);
3952 if ( info->intermediate_rxbuffer == NULL )
3957 } /* end of mgsl_alloc_intermediate_rxbuffer_memory() */
3960 * mgsl_free_intermediate_rxbuffer_memory()
3965 * info pointer to device instance data
3967 * Return Value: None
3969 static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info)
3971 kfree(info->intermediate_rxbuffer);
3972 info->intermediate_rxbuffer = NULL;
3974 } /* end of mgsl_free_intermediate_rxbuffer_memory() */
3977 * mgsl_alloc_intermediate_txbuffer_memory()
3979 * Allocate intermdiate transmit buffer(s) large enough to hold max_frame_size.
3980 * This buffer is used to load transmit frames into the adapter's dma transfer
3981 * buffers when there is sufficient space.
3985 * info pointer to device instance data
3987 * Return Value: 0 if success, otherwise -ENOMEM
3989 static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info)
3993 if ( debug_level >= DEBUG_LEVEL_INFO )
3994 printk("%s %s(%d) allocating %d tx holding buffers\n",
3995 info->device_name, __FILE__,__LINE__,info->num_tx_holding_buffers);
3997 memset(info->tx_holding_buffers,0,sizeof(info->tx_holding_buffers));
3999 for ( i=0; i<info->num_tx_holding_buffers; ++i) {
4000 info->tx_holding_buffers[i].buffer =
4001 kmalloc(info->max_frame_size, GFP_KERNEL);
4002 if (info->tx_holding_buffers[i].buffer == NULL) {
4003 for (--i; i >= 0; i--) {
4004 kfree(info->tx_holding_buffers[i].buffer);
4005 info->tx_holding_buffers[i].buffer = NULL;
4013 } /* end of mgsl_alloc_intermediate_txbuffer_memory() */
4016 * mgsl_free_intermediate_txbuffer_memory()
4021 * info pointer to device instance data
4023 * Return Value: None
4025 static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info)
4029 for ( i=0; i<info->num_tx_holding_buffers; ++i ) {
4030 kfree(info->tx_holding_buffers[i].buffer);
4031 info->tx_holding_buffers[i].buffer = NULL;
4034 info->get_tx_holding_index = 0;
4035 info->put_tx_holding_index = 0;
4036 info->tx_holding_count = 0;
4038 } /* end of mgsl_free_intermediate_txbuffer_memory() */
4042 * load_next_tx_holding_buffer()
4044 * attempts to load the next buffered tx request into the
4049 * info pointer to device instance data
4051 * Return Value: true if next buffered tx request loaded
4052 * into adapter's tx dma buffer,
4055 static bool load_next_tx_holding_buffer(struct mgsl_struct *info)
4059 if ( info->tx_holding_count ) {
4060 /* determine if we have enough tx dma buffers
4061 * to accommodate the next tx frame
4063 struct tx_holding_buffer *ptx =
4064 &info->tx_holding_buffers[info->get_tx_holding_index];
4065 int num_free = num_free_tx_dma_buffers(info);
4066 int num_needed = ptx->buffer_size / DMABUFFERSIZE;
4067 if ( ptx->buffer_size % DMABUFFERSIZE )
4070 if (num_needed <= num_free) {
4071 info->xmit_cnt = ptx->buffer_size;
4072 mgsl_load_tx_dma_buffer(info,ptx->buffer,ptx->buffer_size);
4074 --info->tx_holding_count;
4075 if ( ++info->get_tx_holding_index >= info->num_tx_holding_buffers)
4076 info->get_tx_holding_index=0;
4078 /* restart transmit timer */
4079 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(5000));
4089 * save_tx_buffer_request()
4091 * attempt to store transmit frame request for later transmission
4095 * info pointer to device instance data
4096 * Buffer pointer to buffer containing frame to load
4097 * BufferSize size in bytes of frame in Buffer
4099 * Return Value: 1 if able to store, 0 otherwise
4101 static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize)
4103 struct tx_holding_buffer *ptx;
4105 if ( info->tx_holding_count >= info->num_tx_holding_buffers ) {
4106 return 0; /* all buffers in use */
4109 ptx = &info->tx_holding_buffers[info->put_tx_holding_index];
4110 ptx->buffer_size = BufferSize;
4111 memcpy( ptx->buffer, Buffer, BufferSize);
4113 ++info->tx_holding_count;
4114 if ( ++info->put_tx_holding_index >= info->num_tx_holding_buffers)
4115 info->put_tx_holding_index=0;
4120 static int mgsl_claim_resources(struct mgsl_struct *info)
4122 if (request_region(info->io_base,info->io_addr_size,"synclink") == NULL) {
4123 printk( "%s(%d):I/O address conflict on device %s Addr=%08X\n",
4124 __FILE__,__LINE__,info->device_name, info->io_base);
4127 info->io_addr_requested = true;
4129 if ( request_irq(info->irq_level,mgsl_interrupt,info->irq_flags,
4130 info->device_name, info ) < 0 ) {
4131 printk( "%s(%d):Cant request interrupt on device %s IRQ=%d\n",
4132 __FILE__,__LINE__,info->device_name, info->irq_level );
4135 info->irq_requested = true;
4137 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4138 if (request_mem_region(info->phys_memory_base,0x40000,"synclink") == NULL) {
4139 printk( "%s(%d):mem addr conflict device %s Addr=%08X\n",
4140 __FILE__,__LINE__,info->device_name, info->phys_memory_base);
4143 info->shared_mem_requested = true;
4144 if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclink") == NULL) {
4145 printk( "%s(%d):lcr mem addr conflict device %s Addr=%08X\n",
4146 __FILE__,__LINE__,info->device_name, info->phys_lcr_base + info->lcr_offset);
4149 info->lcr_mem_requested = true;
4151 info->memory_base = ioremap(info->phys_memory_base,0x40000);
4152 if (!info->memory_base) {
4153 printk( "%s(%d):Cant map shared memory on device %s MemAddr=%08X\n",
4154 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4158 if ( !mgsl_memory_test(info) ) {
4159 printk( "%s(%d):Failed shared memory test %s MemAddr=%08X\n",
4160 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4164 info->lcr_base = ioremap(info->phys_lcr_base,PAGE_SIZE) + info->lcr_offset;
4165 if (!info->lcr_base) {
4166 printk( "%s(%d):Cant map LCR memory on device %s MemAddr=%08X\n",
4167 __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
4172 /* claim DMA channel */
4174 if (request_dma(info->dma_level,info->device_name) < 0){
4175 printk( "%s(%d):Cant request DMA channel on device %s DMA=%d\n",
4176 __FILE__,__LINE__,info->device_name, info->dma_level );
4177 mgsl_release_resources( info );
4180 info->dma_requested = true;
4182 /* ISA adapter uses bus master DMA */
4183 set_dma_mode(info->dma_level,DMA_MODE_CASCADE);
4184 enable_dma(info->dma_level);
4187 if ( mgsl_allocate_dma_buffers(info) < 0 ) {
4188 printk( "%s(%d):Cant allocate DMA buffers on device %s DMA=%d\n",
4189 __FILE__,__LINE__,info->device_name, info->dma_level );
4195 mgsl_release_resources(info);
4198 } /* end of mgsl_claim_resources() */
4200 static void mgsl_release_resources(struct mgsl_struct *info)
4202 if ( debug_level >= DEBUG_LEVEL_INFO )
4203 printk( "%s(%d):mgsl_release_resources(%s) entry\n",
4204 __FILE__,__LINE__,info->device_name );
4206 if ( info->irq_requested ) {
4207 free_irq(info->irq_level, info);
4208 info->irq_requested = false;
4210 if ( info->dma_requested ) {
4211 disable_dma(info->dma_level);
4212 free_dma(info->dma_level);
4213 info->dma_requested = false;
4215 mgsl_free_dma_buffers(info);
4216 mgsl_free_intermediate_rxbuffer_memory(info);
4217 mgsl_free_intermediate_txbuffer_memory(info);
4219 if ( info->io_addr_requested ) {
4220 release_region(info->io_base,info->io_addr_size);
4221 info->io_addr_requested = false;
4223 if ( info->shared_mem_requested ) {
4224 release_mem_region(info->phys_memory_base,0x40000);
4225 info->shared_mem_requested = false;
4227 if ( info->lcr_mem_requested ) {
4228 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
4229 info->lcr_mem_requested = false;
4231 if (info->memory_base){
4232 iounmap(info->memory_base);
4233 info->memory_base = NULL;
4235 if (info->lcr_base){
4236 iounmap(info->lcr_base - info->lcr_offset);
4237 info->lcr_base = NULL;
4240 if ( debug_level >= DEBUG_LEVEL_INFO )
4241 printk( "%s(%d):mgsl_release_resources(%s) exit\n",
4242 __FILE__,__LINE__,info->device_name );
4244 } /* end of mgsl_release_resources() */
4246 /* mgsl_add_device()
4248 * Add the specified device instance data structure to the
4249 * global linked list of devices and increment the device count.
4251 * Arguments: info pointer to device instance data
4252 * Return Value: None
4254 static void mgsl_add_device( struct mgsl_struct *info )
4256 info->next_device = NULL;
4257 info->line = mgsl_device_count;
4258 sprintf(info->device_name,"ttySL%d",info->line);
4260 if (info->line < MAX_TOTAL_DEVICES) {
4261 if (maxframe[info->line])
4262 info->max_frame_size = maxframe[info->line];
4263 info->dosyncppp = dosyncppp[info->line];
4265 if (txdmabufs[info->line]) {
4266 info->num_tx_dma_buffers = txdmabufs[info->line];
4267 if (info->num_tx_dma_buffers < 1)
4268 info->num_tx_dma_buffers = 1;
4271 if (txholdbufs[info->line]) {
4272 info->num_tx_holding_buffers = txholdbufs[info->line];
4273 if (info->num_tx_holding_buffers < 1)
4274 info->num_tx_holding_buffers = 1;
4275 else if (info->num_tx_holding_buffers > MAX_TX_HOLDING_BUFFERS)
4276 info->num_tx_holding_buffers = MAX_TX_HOLDING_BUFFERS;
4280 mgsl_device_count++;
4282 if ( !mgsl_device_list )
4283 mgsl_device_list = info;
4285 struct mgsl_struct *current_dev = mgsl_device_list;
4286 while( current_dev->next_device )
4287 current_dev = current_dev->next_device;
4288 current_dev->next_device = info;
4291 if ( info->max_frame_size < 4096 )
4292 info->max_frame_size = 4096;
4293 else if ( info->max_frame_size > 65535 )
4294 info->max_frame_size = 65535;
4296 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4297 printk( "SyncLink PCI v%d %s: IO=%04X IRQ=%d Mem=%08X,%08X MaxFrameSize=%u\n",
4298 info->hw_version + 1, info->device_name, info->io_base, info->irq_level,
4299 info->phys_memory_base, info->phys_lcr_base,
4300 info->max_frame_size );
4302 printk( "SyncLink ISA %s: IO=%04X IRQ=%d DMA=%d MaxFrameSize=%u\n",
4303 info->device_name, info->io_base, info->irq_level, info->dma_level,
4304 info->max_frame_size );
4307 #if SYNCLINK_GENERIC_HDLC
4311 } /* end of mgsl_add_device() */
4313 /* mgsl_allocate_device()
4315 * Allocate and initialize a device instance structure
4318 * Return Value: pointer to mgsl_struct if success, otherwise NULL
4320 static struct mgsl_struct* mgsl_allocate_device(void)
4322 struct mgsl_struct *info;
4324 info = kzalloc(sizeof(struct mgsl_struct),
4328 printk("Error can't allocate device instance data\n");
4330 info->magic = MGSL_MAGIC;
4331 INIT_WORK(&info->task, mgsl_bh_handler);
4332 info->max_frame_size = 4096;
4333 info->close_delay = 5*HZ/10;
4334 info->closing_wait = 30*HZ;
4335 init_waitqueue_head(&info->open_wait);
4336 init_waitqueue_head(&info->close_wait);
4337 init_waitqueue_head(&info->status_event_wait_q);
4338 init_waitqueue_head(&info->event_wait_q);
4339 spin_lock_init(&info->irq_spinlock);
4340 spin_lock_init(&info->netlock);
4341 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
4342 info->idle_mode = HDLC_TXIDLE_FLAGS;
4343 info->num_tx_dma_buffers = 1;
4344 info->num_tx_holding_buffers = 0;
4349 } /* end of mgsl_allocate_device()*/
4351 static const struct tty_operations mgsl_ops = {
4353 .close = mgsl_close,
4354 .write = mgsl_write,
4355 .put_char = mgsl_put_char,
4356 .flush_chars = mgsl_flush_chars,
4357 .write_room = mgsl_write_room,
4358 .chars_in_buffer = mgsl_chars_in_buffer,
4359 .flush_buffer = mgsl_flush_buffer,
4360 .ioctl = mgsl_ioctl,
4361 .throttle = mgsl_throttle,
4362 .unthrottle = mgsl_unthrottle,
4363 .send_xchar = mgsl_send_xchar,
4364 .break_ctl = mgsl_break,
4365 .wait_until_sent = mgsl_wait_until_sent,
4366 .read_proc = mgsl_read_proc,
4367 .set_termios = mgsl_set_termios,
4369 .start = mgsl_start,
4370 .hangup = mgsl_hangup,
4371 .tiocmget = tiocmget,
4372 .tiocmset = tiocmset,
4376 * perform tty device initialization
4378 static int mgsl_init_tty(void)
4382 serial_driver = alloc_tty_driver(128);
4386 serial_driver->owner = THIS_MODULE;
4387 serial_driver->driver_name = "synclink";
4388 serial_driver->name = "ttySL";
4389 serial_driver->major = ttymajor;
4390 serial_driver->minor_start = 64;
4391 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4392 serial_driver->subtype = SERIAL_TYPE_NORMAL;
4393 serial_driver->init_termios = tty_std_termios;
4394 serial_driver->init_termios.c_cflag =
4395 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4396 serial_driver->init_termios.c_ispeed = 9600;
4397 serial_driver->init_termios.c_ospeed = 9600;
4398 serial_driver->flags = TTY_DRIVER_REAL_RAW;
4399 tty_set_operations(serial_driver, &mgsl_ops);
4400 if ((rc = tty_register_driver(serial_driver)) < 0) {
4401 printk("%s(%d):Couldn't register serial driver\n",
4403 put_tty_driver(serial_driver);
4404 serial_driver = NULL;
4408 printk("%s %s, tty major#%d\n",
4409 driver_name, driver_version,
4410 serial_driver->major);
4414 /* enumerate user specified ISA adapters
4416 static void mgsl_enum_isa_devices(void)
4418 struct mgsl_struct *info;
4421 /* Check for user specified ISA devices */
4423 for (i=0 ;(i < MAX_ISA_DEVICES) && io[i] && irq[i]; i++){
4424 if ( debug_level >= DEBUG_LEVEL_INFO )
4425 printk("ISA device specified io=%04X,irq=%d,dma=%d\n",
4426 io[i], irq[i], dma[i] );
4428 info = mgsl_allocate_device();
4430 /* error allocating device instance data */
4431 if ( debug_level >= DEBUG_LEVEL_ERROR )
4432 printk( "can't allocate device instance data.\n");
4436 /* Copy user configuration info to device instance data */
4437 info->io_base = (unsigned int)io[i];
4438 info->irq_level = (unsigned int)irq[i];
4439 info->irq_level = irq_canonicalize(info->irq_level);
4440 info->dma_level = (unsigned int)dma[i];
4441 info->bus_type = MGSL_BUS_TYPE_ISA;
4442 info->io_addr_size = 16;
4443 info->irq_flags = 0;
4445 mgsl_add_device( info );
4449 static void synclink_cleanup(void)
4452 struct mgsl_struct *info;
4453 struct mgsl_struct *tmp;
4455 printk("Unloading %s: %s\n", driver_name, driver_version);
4457 if (serial_driver) {
4458 if ((rc = tty_unregister_driver(serial_driver)))
4459 printk("%s(%d) failed to unregister tty driver err=%d\n",
4460 __FILE__,__LINE__,rc);
4461 put_tty_driver(serial_driver);
4464 info = mgsl_device_list;
4466 #if SYNCLINK_GENERIC_HDLC
4469 mgsl_release_resources(info);
4471 info = info->next_device;
4476 pci_unregister_driver(&synclink_pci_driver);
4479 static int __init synclink_init(void)
4483 if (break_on_load) {
4484 mgsl_get_text_ptr();
4488 printk("%s %s\n", driver_name, driver_version);
4490 mgsl_enum_isa_devices();
4491 if ((rc = pci_register_driver(&synclink_pci_driver)) < 0)
4492 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
4494 pci_registered = true;
4496 if ((rc = mgsl_init_tty()) < 0)
4506 static void __exit synclink_exit(void)
4511 module_init(synclink_init);
4512 module_exit(synclink_exit);
4517 * Issue a USC Receive/Transmit command to the
4518 * Channel Command/Address Register (CCAR).
4522 * The command is encoded in the most significant 5 bits <15..11>
4523 * of the CCAR value. Bits <10..7> of the CCAR must be preserved
4524 * and Bits <6..0> must be written as zeros.
4528 * info pointer to device information structure
4529 * Cmd command mask (use symbolic macros)
4535 static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd )
4537 /* output command to CCAR in bits <15..11> */
4538 /* preserve bits <10..7>, bits <6..0> must be zero */
4540 outw( Cmd + info->loopback_bits, info->io_base + CCAR );
4542 /* Read to flush write to CCAR */
4543 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4544 inw( info->io_base + CCAR );
4546 } /* end of usc_RTCmd() */
4551 * Issue a DMA command to the DMA Command/Address Register (DCAR).
4555 * info pointer to device information structure
4556 * Cmd DMA command mask (usc_DmaCmd_XX Macros)
4562 static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd )
4564 /* write command mask to DCAR */
4565 outw( Cmd + info->mbre_bit, info->io_base );
4567 /* Read to flush write to DCAR */
4568 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4569 inw( info->io_base );
4571 } /* end of usc_DmaCmd() */
4576 * Write a 16-bit value to a USC DMA register
4580 * info pointer to device info structure
4581 * RegAddr register address (number) for write
4582 * RegValue 16-bit value to write to register
4589 static void usc_OutDmaReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4591 /* Note: The DCAR is located at the adapter base address */
4592 /* Note: must preserve state of BIT8 in DCAR */
4594 outw( RegAddr + info->mbre_bit, info->io_base );
4595 outw( RegValue, info->io_base );
4597 /* Read to flush write to DCAR */
4598 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4599 inw( info->io_base );
4601 } /* end of usc_OutDmaReg() */
4606 * Read a 16-bit value from a DMA register
4610 * info pointer to device info structure
4611 * RegAddr register address (number) to read from
4615 * The 16-bit value read from register
4618 static u16 usc_InDmaReg( struct mgsl_struct *info, u16 RegAddr )
4620 /* Note: The DCAR is located at the adapter base address */
4621 /* Note: must preserve state of BIT8 in DCAR */
4623 outw( RegAddr + info->mbre_bit, info->io_base );
4624 return inw( info->io_base );
4626 } /* end of usc_InDmaReg() */
4632 * Write a 16-bit value to a USC serial channel register
4636 * info pointer to device info structure
4637 * RegAddr register address (number) to write to
4638 * RegValue 16-bit value to write to register
4645 static void usc_OutReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4647 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4648 outw( RegValue, info->io_base + CCAR );
4650 /* Read to flush write to CCAR */
4651 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4652 inw( info->io_base + CCAR );
4654 } /* end of usc_OutReg() */
4659 * Reads a 16-bit value from a USC serial channel register
4663 * info pointer to device extension
4664 * RegAddr register address (number) to read from
4668 * 16-bit value read from register
4670 static u16 usc_InReg( struct mgsl_struct *info, u16 RegAddr )
4672 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4673 return inw( info->io_base + CCAR );
4675 } /* end of usc_InReg() */
4677 /* usc_set_sdlc_mode()
4679 * Set up the adapter for SDLC DMA communications.
4681 * Arguments: info pointer to device instance data
4682 * Return Value: NONE
4684 static void usc_set_sdlc_mode( struct mgsl_struct *info )
4690 * determine if the IUSC on the adapter is pre-SL1660. If
4691 * not, take advantage of the UnderWait feature of more
4692 * modern chips. If an underrun occurs and this bit is set,
4693 * the transmitter will idle the programmed idle pattern
4694 * until the driver has time to service the underrun. Otherwise,
4695 * the dma controller may get the cycles previously requested
4696 * and begin transmitting queued tx data.
4698 usc_OutReg(info,TMCR,0x1f);
4699 RegValue=usc_InReg(info,TMDR);
4700 PreSL1660 = (RegValue == IUSC_PRE_SL1660);
4702 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
4705 ** Channel Mode Register (CMR)
4707 ** <15..14> 10 Tx Sub Modes, Send Flag on Underrun
4708 ** <13> 0 0 = Transmit Disabled (initially)
4709 ** <12> 0 1 = Consecutive Idles share common 0
4710 ** <11..8> 1110 Transmitter Mode = HDLC/SDLC Loop
4711 ** <7..4> 0000 Rx Sub Modes, addr/ctrl field handling
4712 ** <3..0> 0110 Receiver Mode = HDLC/SDLC
4714 ** 1000 1110 0000 0110 = 0x8e06
4718 /*--------------------------------------------------
4719 * ignore user options for UnderRun Actions and
4721 *--------------------------------------------------*/
4725 /* Channel mode Register (CMR)
4727 * <15..14> 00 Tx Sub modes, Underrun Action
4728 * <13> 0 1 = Send Preamble before opening flag
4729 * <12> 0 1 = Consecutive Idles share common 0
4730 * <11..8> 0110 Transmitter mode = HDLC/SDLC
4731 * <7..4> 0000 Rx Sub modes, addr/ctrl field handling
4732 * <3..0> 0110 Receiver mode = HDLC/SDLC
4734 * 0000 0110 0000 0110 = 0x0606
4736 if (info->params.mode == MGSL_MODE_RAW) {
4737 RegValue = 0x0001; /* Set Receive mode = external sync */
4739 usc_OutReg( info, IOCR, /* Set IOCR DCD is RxSync Detect Input */
4740 (unsigned short)((usc_InReg(info, IOCR) & ~(BIT13|BIT12)) | BIT12));
4744 * CMR <15> 0 Don't send CRC on Tx Underrun
4745 * CMR <14> x undefined
4746 * CMR <13> 0 Send preamble before openning sync
4747 * CMR <12> 0 Send 8-bit syncs, 1=send Syncs per TxLength
4750 * CMR <11-8) 0100 MonoSync
4752 * 0x00 0100 xxxx xxxx 04xx
4760 if ( info->params.flags & HDLC_FLAG_UNDERRUN_ABORT15 )
4762 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_FLAG )
4764 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_CRC )
4765 RegValue |= BIT15 + BIT14;
4768 if ( info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE )
4772 if ( info->params.mode == MGSL_MODE_HDLC &&
4773 (info->params.flags & HDLC_FLAG_SHARE_ZERO) )
4776 if ( info->params.addr_filter != 0xff )
4778 /* set up receive address filtering */
4779 usc_OutReg( info, RSR, info->params.addr_filter );
4783 usc_OutReg( info, CMR, RegValue );
4784 info->cmr_value = RegValue;
4786 /* Receiver mode Register (RMR)
4788 * <15..13> 000 encoding
4789 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4790 * <10> 1 1 = Set CRC to all 1s (use for SDLC/HDLC)
4791 * <9> 0 1 = Include Receive chars in CRC
4792 * <8> 1 1 = Use Abort/PE bit as abort indicator
4793 * <7..6> 00 Even parity
4794 * <5> 0 parity disabled
4795 * <4..2> 000 Receive Char Length = 8 bits
4796 * <1..0> 00 Disable Receiver
4798 * 0000 0101 0000 0000 = 0x0500
4803 switch ( info->params.encoding ) {
4804 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4805 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4806 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4807 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4808 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4809 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4810 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4813 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4815 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4816 RegValue |= ( BIT12 | BIT10 | BIT9 );
4818 usc_OutReg( info, RMR, RegValue );
4820 /* Set the Receive count Limit Register (RCLR) to 0xffff. */
4821 /* When an opening flag of an SDLC frame is recognized the */
4822 /* Receive Character count (RCC) is loaded with the value in */
4823 /* RCLR. The RCC is decremented for each received byte. The */
4824 /* value of RCC is stored after the closing flag of the frame */
4825 /* allowing the frame size to be computed. */
4827 usc_OutReg( info, RCLR, RCLRVALUE );
4829 usc_RCmd( info, RCmd_SelectRicrdma_level );
4831 /* Receive Interrupt Control Register (RICR)
4833 * <15..8> ? RxFIFO DMA Request Level
4834 * <7> 0 Exited Hunt IA (Interrupt Arm)
4835 * <6> 0 Idle Received IA
4836 * <5> 0 Break/Abort IA
4838 * <3> 1 Queued status reflects oldest 2 bytes in FIFO
4840 * <1> 1 Rx Overrun IA
4841 * <0> 0 Select TC0 value for readback
4843 * 0000 0000 0000 1000 = 0x000a
4846 /* Carry over the Exit Hunt and Idle Received bits */
4847 /* in case they have been armed by usc_ArmEvents. */
4849 RegValue = usc_InReg( info, RICR ) & 0xc0;
4851 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4852 usc_OutReg( info, RICR, (u16)(0x030a | RegValue) );
4854 usc_OutReg( info, RICR, (u16)(0x140a | RegValue) );
4856 /* Unlatch all Rx status bits and clear Rx status IRQ Pending */
4858 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
4859 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
4861 /* Transmit mode Register (TMR)
4863 * <15..13> 000 encoding
4864 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4865 * <10> 1 1 = Start CRC as all 1s (use for SDLC/HDLC)
4866 * <9> 0 1 = Tx CRC Enabled
4867 * <8> 0 1 = Append CRC to end of transmit frame
4868 * <7..6> 00 Transmit parity Even
4869 * <5> 0 Transmit parity Disabled
4870 * <4..2> 000 Tx Char Length = 8 bits
4871 * <1..0> 00 Disable Transmitter
4873 * 0000 0100 0000 0000 = 0x0400
4878 switch ( info->params.encoding ) {
4879 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4880 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4881 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4882 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4883 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4884 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4885 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4888 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4889 RegValue |= BIT9 + BIT8;
4890 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4891 RegValue |= ( BIT12 | BIT10 | BIT9 | BIT8);
4893 usc_OutReg( info, TMR, RegValue );
4895 usc_set_txidle( info );
4898 usc_TCmd( info, TCmd_SelectTicrdma_level );
4900 /* Transmit Interrupt Control Register (TICR)
4902 * <15..8> ? Transmit FIFO DMA Level
4903 * <7> 0 Present IA (Interrupt Arm)
4904 * <6> 0 Idle Sent IA
4905 * <5> 1 Abort Sent IA
4906 * <4> 1 EOF/EOM Sent IA
4908 * <2> 1 1 = Wait for SW Trigger to Start Frame
4909 * <1> 1 Tx Underrun IA
4910 * <0> 0 TC0 constant on read back
4912 * 0000 0000 0011 0110 = 0x0036
4915 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4916 usc_OutReg( info, TICR, 0x0736 );
4918 usc_OutReg( info, TICR, 0x1436 );
4920 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
4921 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
4924 ** Transmit Command/Status Register (TCSR)
4926 ** <15..12> 0000 TCmd
4927 ** <11> 0/1 UnderWait
4928 ** <10..08> 000 TxIdle
4932 ** <4> x EOF/EOM Sent
4938 ** 0000 0000 0000 0000 = 0x0000
4940 info->tcsr_value = 0;
4943 info->tcsr_value |= TCSR_UNDERWAIT;
4945 usc_OutReg( info, TCSR, info->tcsr_value );
4947 /* Clock mode Control Register (CMCR)
4949 * <15..14> 00 counter 1 Source = Disabled
4950 * <13..12> 00 counter 0 Source = Disabled
4951 * <11..10> 11 BRG1 Input is TxC Pin
4952 * <9..8> 11 BRG0 Input is TxC Pin
4953 * <7..6> 01 DPLL Input is BRG1 Output
4954 * <5..3> XXX TxCLK comes from Port 0
4955 * <2..0> XXX RxCLK comes from Port 1
4957 * 0000 1111 0111 0111 = 0x0f77
4962 if ( info->params.flags & HDLC_FLAG_RXC_DPLL )
4963 RegValue |= 0x0003; /* RxCLK from DPLL */
4964 else if ( info->params.flags & HDLC_FLAG_RXC_BRG )
4965 RegValue |= 0x0004; /* RxCLK from BRG0 */
4966 else if ( info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4967 RegValue |= 0x0006; /* RxCLK from TXC Input */
4969 RegValue |= 0x0007; /* RxCLK from Port1 */
4971 if ( info->params.flags & HDLC_FLAG_TXC_DPLL )
4972 RegValue |= 0x0018; /* TxCLK from DPLL */
4973 else if ( info->params.flags & HDLC_FLAG_TXC_BRG )
4974 RegValue |= 0x0020; /* TxCLK from BRG0 */
4975 else if ( info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4976 RegValue |= 0x0038; /* RxCLK from TXC Input */
4978 RegValue |= 0x0030; /* TxCLK from Port0 */
4980 usc_OutReg( info, CMCR, RegValue );
4983 /* Hardware Configuration Register (HCR)
4985 * <15..14> 00 CTR0 Divisor:00=32,01=16,10=8,11=4
4986 * <13> 0 CTR1DSel:0=CTR0Div determines CTR0Div
4987 * <12> 0 CVOK:0=report code violation in biphase
4988 * <11..10> 00 DPLL Divisor:00=32,01=16,10=8,11=4
4989 * <9..8> XX DPLL mode:00=disable,01=NRZ,10=Biphase,11=Biphase Level
4990 * <7..6> 00 reserved
4991 * <5> 0 BRG1 mode:0=continuous,1=single cycle
4993 * <3..2> 00 reserved
4994 * <1> 0 BRG0 mode:0=continuous,1=single cycle
5000 if ( info->params.flags & (HDLC_FLAG_RXC_DPLL + HDLC_FLAG_TXC_DPLL) ) {
5005 /* DPLL is enabled. Use BRG1 to provide continuous reference clock */
5006 /* for DPLL. DPLL mode in HCR is dependent on the encoding used. */
5008 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
5009 XtalSpeed = 11059200;
5011 XtalSpeed = 14745600;
5013 if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
5017 else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
5024 /* Tc = (Xtal/Speed) - 1 */
5025 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
5026 /* then rounding up gives a more precise time constant. Instead */
5027 /* of rounding up and then subtracting 1 we just don't subtract */
5028 /* the one in this case. */
5030 /*--------------------------------------------------
5031 * ejz: for DPLL mode, application should use the
5032 * same clock speed as the partner system, even
5033 * though clocking is derived from the input RxData.
5034 * In case the user uses a 0 for the clock speed,
5035 * default to 0xffffffff and don't try to divide by
5037 *--------------------------------------------------*/
5038 if ( info->params.clock_speed )
5040 Tc = (u16)((XtalSpeed/DpllDivisor)/info->params.clock_speed);
5041 if ( !((((XtalSpeed/DpllDivisor) % info->params.clock_speed) * 2)
5042 / info->params.clock_speed) )
5049 /* Write 16-bit Time Constant for BRG1 */
5050 usc_OutReg( info, TC1R, Tc );
5052 RegValue |= BIT4; /* enable BRG1 */
5054 switch ( info->params.encoding ) {
5055 case HDLC_ENCODING_NRZ:
5056 case HDLC_ENCODING_NRZB:
5057 case HDLC_ENCODING_NRZI_MARK:
5058 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT8; break;
5059 case HDLC_ENCODING_BIPHASE_MARK:
5060 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT9; break;
5061 case HDLC_ENCODING_BIPHASE_LEVEL:
5062 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT9 + BIT8; break;
5066 usc_OutReg( info, HCR, RegValue );
5069 /* Channel Control/status Register (CCSR)
5071 * <15> X RCC FIFO Overflow status (RO)
5072 * <14> X RCC FIFO Not Empty status (RO)
5073 * <13> 0 1 = Clear RCC FIFO (WO)
5074 * <12> X DPLL Sync (RW)
5075 * <11> X DPLL 2 Missed Clocks status (RO)
5076 * <10> X DPLL 1 Missed Clock status (RO)
5077 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
5078 * <7> X SDLC Loop On status (RO)
5079 * <6> X SDLC Loop Send status (RO)
5080 * <5> 1 Bypass counters for TxClk and RxClk (RW)
5081 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
5082 * <1..0> 00 reserved
5084 * 0000 0000 0010 0000 = 0x0020
5087 usc_OutReg( info, CCSR, 0x1020 );
5090 if ( info->params.flags & HDLC_FLAG_AUTO_CTS ) {
5091 usc_OutReg( info, SICR,
5092 (u16)(usc_InReg(info,SICR) | SICR_CTS_INACTIVE) );
5096 /* enable Master Interrupt Enable bit (MIE) */
5097 usc_EnableMasterIrqBit( info );
5099 usc_ClearIrqPendingBits( info, RECEIVE_STATUS + RECEIVE_DATA +
5100 TRANSMIT_STATUS + TRANSMIT_DATA + MISC);
5102 /* arm RCC underflow interrupt */
5103 usc_OutReg(info, SICR, (u16)(usc_InReg(info,SICR) | BIT3));
5104 usc_EnableInterrupts(info, MISC);
5107 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5108 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5109 info->mbre_bit = BIT8;
5110 outw( BIT8, info->io_base ); /* set Master Bus Enable (DCAR) */
5112 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
5113 /* Enable DMAEN (Port 7, Bit 14) */
5114 /* This connects the DMA request signal to the ISA bus */
5115 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) & ~BIT14));
5118 /* DMA Control Register (DCR)
5120 * <15..14> 10 Priority mode = Alternating Tx/Rx
5121 * 01 Rx has priority
5122 * 00 Tx has priority
5124 * <13> 1 Enable Priority Preempt per DCR<15..14>
5125 * (WARNING DCR<11..10> must be 00 when this is 1)
5126 * 0 Choose activate channel per DCR<11..10>
5128 * <12> 0 Little Endian for Array/List
5129 * <11..10> 00 Both Channels can use each bus grant
5130 * <9..6> 0000 reserved
5131 * <5> 0 7 CLK - Minimum Bus Re-request Interval
5132 * <4> 0 1 = drive D/C and S/D pins
5133 * <3> 1 1 = Add one wait state to all DMA cycles.
5134 * <2> 0 1 = Strobe /UAS on every transfer.
5135 * <1..0> 11 Addr incrementing only affects LS24 bits
5137 * 0110 0000 0000 1011 = 0x600b
5140 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5141 /* PCI adapter does not need DMA wait state */
5142 usc_OutDmaReg( info, DCR, 0xa00b );
5145 usc_OutDmaReg( info, DCR, 0x800b );
5148 /* Receive DMA mode Register (RDMR)
5150 * <15..14> 11 DMA mode = Linked List Buffer mode
5151 * <13> 1 RSBinA/L = store Rx status Block in Arrary/List entry
5152 * <12> 1 Clear count of List Entry after fetching
5153 * <11..10> 00 Address mode = Increment
5154 * <9> 1 Terminate Buffer on RxBound
5155 * <8> 0 Bus Width = 16bits
5156 * <7..0> ? status Bits (write as 0s)
5158 * 1111 0010 0000 0000 = 0xf200
5161 usc_OutDmaReg( info, RDMR, 0xf200 );
5164 /* Transmit DMA mode Register (TDMR)
5166 * <15..14> 11 DMA mode = Linked List Buffer mode
5167 * <13> 1 TCBinA/L = fetch Tx Control Block from List entry
5168 * <12> 1 Clear count of List Entry after fetching
5169 * <11..10> 00 Address mode = Increment
5170 * <9> 1 Terminate Buffer on end of frame
5171 * <8> 0 Bus Width = 16bits
5172 * <7..0> ? status Bits (Read Only so write as 0)
5174 * 1111 0010 0000 0000 = 0xf200
5177 usc_OutDmaReg( info, TDMR, 0xf200 );
5180 /* DMA Interrupt Control Register (DICR)
5182 * <15> 1 DMA Interrupt Enable
5183 * <14> 0 1 = Disable IEO from USC
5184 * <13> 0 1 = Don't provide vector during IntAck
5185 * <12> 1 1 = Include status in Vector
5186 * <10..2> 0 reserved, Must be 0s
5187 * <1> 0 1 = Rx DMA Interrupt Enabled
5188 * <0> 0 1 = Tx DMA Interrupt Enabled
5190 * 1001 0000 0000 0000 = 0x9000
5193 usc_OutDmaReg( info, DICR, 0x9000 );
5195 usc_InDmaReg( info, RDMR ); /* clear pending receive DMA IRQ bits */
5196 usc_InDmaReg( info, TDMR ); /* clear pending transmit DMA IRQ bits */
5197 usc_OutDmaReg( info, CDIR, 0x0303 ); /* clear IUS and Pending for Tx and Rx */
5199 /* Channel Control Register (CCR)
5201 * <15..14> 10 Use 32-bit Tx Control Blocks (TCBs)
5202 * <13> 0 Trigger Tx on SW Command Disabled
5203 * <12> 0 Flag Preamble Disabled
5204 * <11..10> 00 Preamble Length
5205 * <9..8> 00 Preamble Pattern
5206 * <7..6> 10 Use 32-bit Rx status Blocks (RSBs)
5207 * <5> 0 Trigger Rx on SW Command Disabled
5210 * 1000 0000 1000 0000 = 0x8080
5215 switch ( info->params.preamble_length ) {
5216 case HDLC_PREAMBLE_LENGTH_16BITS: RegValue |= BIT10; break;
5217 case HDLC_PREAMBLE_LENGTH_32BITS: RegValue |= BIT11; break;
5218 case HDLC_PREAMBLE_LENGTH_64BITS: RegValue |= BIT11 + BIT10; break;
5221 switch ( info->params.preamble ) {
5222 case HDLC_PREAMBLE_PATTERN_FLAGS: RegValue |= BIT8 + BIT12; break;
5223 case HDLC_PREAMBLE_PATTERN_ONES: RegValue |= BIT8; break;
5224 case HDLC_PREAMBLE_PATTERN_10: RegValue |= BIT9; break;
5225 case HDLC_PREAMBLE_PATTERN_01: RegValue |= BIT9 + BIT8; break;
5228 usc_OutReg( info, CCR, RegValue );
5232 * Burst/Dwell Control Register
5234 * <15..8> 0x20 Maximum number of transfers per bus grant
5235 * <7..0> 0x00 Maximum number of clock cycles per bus grant
5238 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5239 /* don't limit bus occupancy on PCI adapter */
5240 usc_OutDmaReg( info, BDCR, 0x0000 );
5243 usc_OutDmaReg( info, BDCR, 0x2000 );
5245 usc_stop_transmitter(info);
5246 usc_stop_receiver(info);
5248 } /* end of usc_set_sdlc_mode() */
5250 /* usc_enable_loopback()
5252 * Set the 16C32 for internal loopback mode.
5253 * The TxCLK and RxCLK signals are generated from the BRG0 and
5254 * the TxD is looped back to the RxD internally.
5256 * Arguments: info pointer to device instance data
5257 * enable 1 = enable loopback, 0 = disable
5258 * Return Value: None
5260 static void usc_enable_loopback(struct mgsl_struct *info, int enable)
5263 /* blank external TXD output */
5264 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) | (BIT7+BIT6));
5266 /* Clock mode Control Register (CMCR)
5268 * <15..14> 00 counter 1 Disabled
5269 * <13..12> 00 counter 0 Disabled
5270 * <11..10> 11 BRG1 Input is TxC Pin
5271 * <9..8> 11 BRG0 Input is TxC Pin
5272 * <7..6> 01 DPLL Input is BRG1 Output
5273 * <5..3> 100 TxCLK comes from BRG0
5274 * <2..0> 100 RxCLK comes from BRG0
5276 * 0000 1111 0110 0100 = 0x0f64
5279 usc_OutReg( info, CMCR, 0x0f64 );
5281 /* Write 16-bit Time Constant for BRG0 */
5282 /* use clock speed if available, otherwise use 8 for diagnostics */
5283 if (info->params.clock_speed) {
5284 if (info->bus_type == MGSL_BUS_TYPE_PCI)
5285 usc_OutReg(info, TC0R, (u16)((11059200/info->params.clock_speed)-1));
5287 usc_OutReg(info, TC0R, (u16)((14745600/info->params.clock_speed)-1));
5289 usc_OutReg(info, TC0R, (u16)8);
5291 /* Hardware Configuration Register (HCR) Clear Bit 1, BRG0
5292 mode = Continuous Set Bit 0 to enable BRG0. */
5293 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5295 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5296 usc_OutReg(info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004));
5298 /* set Internal Data loopback mode */
5299 info->loopback_bits = 0x300;
5300 outw( 0x0300, info->io_base + CCAR );
5302 /* enable external TXD output */
5303 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) & ~(BIT7+BIT6));
5305 /* clear Internal Data loopback mode */
5306 info->loopback_bits = 0;
5307 outw( 0,info->io_base + CCAR );
5310 } /* end of usc_enable_loopback() */
5312 /* usc_enable_aux_clock()
5314 * Enabled the AUX clock output at the specified frequency.
5318 * info pointer to device extension
5319 * data_rate data rate of clock in bits per second
5320 * A data rate of 0 disables the AUX clock.
5322 * Return Value: None
5324 static void usc_enable_aux_clock( struct mgsl_struct *info, u32 data_rate )
5330 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
5331 XtalSpeed = 11059200;
5333 XtalSpeed = 14745600;
5336 /* Tc = (Xtal/Speed) - 1 */
5337 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
5338 /* then rounding up gives a more precise time constant. Instead */
5339 /* of rounding up and then subtracting 1 we just don't subtract */
5340 /* the one in this case. */
5343 Tc = (u16)(XtalSpeed/data_rate);
5344 if ( !(((XtalSpeed % data_rate) * 2) / data_rate) )
5347 /* Write 16-bit Time Constant for BRG0 */
5348 usc_OutReg( info, TC0R, Tc );
5351 * Hardware Configuration Register (HCR)
5352 * Clear Bit 1, BRG0 mode = Continuous
5353 * Set Bit 0 to enable BRG0.
5356 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5358 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5359 usc_OutReg( info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
5361 /* data rate == 0 so turn off BRG0 */
5362 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
5365 } /* end of usc_enable_aux_clock() */
5369 * usc_process_rxoverrun_sync()
5371 * This function processes a receive overrun by resetting the
5372 * receive DMA buffers and issuing a Purge Rx FIFO command
5373 * to allow the receiver to continue receiving.
5377 * info pointer to device extension
5379 * Return Value: None
5381 static void usc_process_rxoverrun_sync( struct mgsl_struct *info )
5385 int frame_start_index;
5386 bool start_of_frame_found = false;
5387 bool end_of_frame_found = false;
5388 bool reprogram_dma = false;
5390 DMABUFFERENTRY *buffer_list = info->rx_buffer_list;
5393 usc_DmaCmd( info, DmaCmd_PauseRxChannel );
5394 usc_RCmd( info, RCmd_EnterHuntmode );
5395 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5397 /* CurrentRxBuffer points to the 1st buffer of the next */
5398 /* possibly available receive frame. */
5400 frame_start_index = start_index = end_index = info->current_rx_buffer;
5402 /* Search for an unfinished string of buffers. This means */
5403 /* that a receive frame started (at least one buffer with */
5404 /* count set to zero) but there is no terminiting buffer */
5405 /* (status set to non-zero). */
5407 while( !buffer_list[end_index].count )
5409 /* Count field has been reset to zero by 16C32. */
5410 /* This buffer is currently in use. */
5412 if ( !start_of_frame_found )
5414 start_of_frame_found = true;
5415 frame_start_index = end_index;
5416 end_of_frame_found = false;
5419 if ( buffer_list[end_index].status )
5421 /* Status field has been set by 16C32. */
5422 /* This is the last buffer of a received frame. */
5424 /* We want to leave the buffers for this frame intact. */
5425 /* Move on to next possible frame. */
5427 start_of_frame_found = false;
5428 end_of_frame_found = true;
5431 /* advance to next buffer entry in linked list */
5433 if ( end_index == info->rx_buffer_count )
5436 if ( start_index == end_index )
5438 /* The entire list has been searched with all Counts == 0 and */
5439 /* all Status == 0. The receive buffers are */
5440 /* completely screwed, reset all receive buffers! */
5441 mgsl_reset_rx_dma_buffers( info );
5442 frame_start_index = 0;
5443 start_of_frame_found = false;
5444 reprogram_dma = true;
5449 if ( start_of_frame_found && !end_of_frame_found )
5451 /* There is an unfinished string of receive DMA buffers */
5452 /* as a result of the receiver overrun. */
5454 /* Reset the buffers for the unfinished frame */
5455 /* and reprogram the receive DMA controller to start */
5456 /* at the 1st buffer of unfinished frame. */
5458 start_index = frame_start_index;
5462 *((unsigned long *)&(info->rx_buffer_list[start_index++].count)) = DMABUFFERSIZE;
5464 /* Adjust index for wrap around. */
5465 if ( start_index == info->rx_buffer_count )
5468 } while( start_index != end_index );
5470 reprogram_dma = true;
5473 if ( reprogram_dma )
5475 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
5476 usc_ClearIrqPendingBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5477 usc_UnlatchRxstatusBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5479 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5481 /* This empties the receive FIFO and loads the RCC with RCLR */
5482 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5484 /* program 16C32 with physical address of 1st DMA buffer entry */
5485 phys_addr = info->rx_buffer_list[frame_start_index].phys_entry;
5486 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5487 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5489 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5490 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5491 usc_EnableInterrupts( info, RECEIVE_STATUS );
5493 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5494 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5496 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5497 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5498 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5499 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5500 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5502 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5506 /* This empties the receive FIFO and loads the RCC with RCLR */
5507 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5508 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5511 } /* end of usc_process_rxoverrun_sync() */
5513 /* usc_stop_receiver()
5515 * Disable USC receiver
5517 * Arguments: info pointer to device instance data
5518 * Return Value: None
5520 static void usc_stop_receiver( struct mgsl_struct *info )
5522 if (debug_level >= DEBUG_LEVEL_ISR)
5523 printk("%s(%d):usc_stop_receiver(%s)\n",
5524 __FILE__,__LINE__, info->device_name );
5526 /* Disable receive DMA channel. */
5527 /* This also disables receive DMA channel interrupts */
5528 usc_DmaCmd( info, DmaCmd_ResetRxChannel );
5530 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5531 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5532 usc_DisableInterrupts( info, RECEIVE_DATA + RECEIVE_STATUS );
5534 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5536 /* This empties the receive FIFO and loads the RCC with RCLR */
5537 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5538 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5540 info->rx_enabled = false;
5541 info->rx_overflow = false;
5542 info->rx_rcc_underrun = false;
5544 } /* end of stop_receiver() */
5546 /* usc_start_receiver()
5548 * Enable the USC receiver
5550 * Arguments: info pointer to device instance data
5551 * Return Value: None
5553 static void usc_start_receiver( struct mgsl_struct *info )
5557 if (debug_level >= DEBUG_LEVEL_ISR)
5558 printk("%s(%d):usc_start_receiver(%s)\n",
5559 __FILE__,__LINE__, info->device_name );
5561 mgsl_reset_rx_dma_buffers( info );
5562 usc_stop_receiver( info );
5564 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5565 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5567 if ( info->params.mode == MGSL_MODE_HDLC ||
5568 info->params.mode == MGSL_MODE_RAW ) {
5569 /* DMA mode Transfers */
5570 /* Program the DMA controller. */
5571 /* Enable the DMA controller end of buffer interrupt. */
5573 /* program 16C32 with physical address of 1st DMA buffer entry */
5574 phys_addr = info->rx_buffer_list[0].phys_entry;
5575 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5576 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5578 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5579 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5580 usc_EnableInterrupts( info, RECEIVE_STATUS );
5582 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5583 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5585 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5586 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5587 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5588 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5589 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5591 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5593 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
5594 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
5595 usc_EnableInterrupts(info, RECEIVE_DATA);
5597 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5598 usc_RCmd( info, RCmd_EnterHuntmode );
5600 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5603 usc_OutReg( info, CCSR, 0x1020 );
5605 info->rx_enabled = true;
5607 } /* end of usc_start_receiver() */
5609 /* usc_start_transmitter()
5611 * Enable the USC transmitter and send a transmit frame if
5612 * one is loaded in the DMA buffers.
5614 * Arguments: info pointer to device instance data
5615 * Return Value: None
5617 static void usc_start_transmitter( struct mgsl_struct *info )
5620 unsigned int FrameSize;
5622 if (debug_level >= DEBUG_LEVEL_ISR)
5623 printk("%s(%d):usc_start_transmitter(%s)\n",
5624 __FILE__,__LINE__, info->device_name );
5626 if ( info->xmit_cnt ) {
5628 /* If auto RTS enabled and RTS is inactive, then assert */
5629 /* RTS and set a flag indicating that the driver should */
5630 /* negate RTS when the transmission completes. */
5632 info->drop_rts_on_tx_done = false;
5634 if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
5635 usc_get_serial_signals( info );
5636 if ( !(info->serial_signals & SerialSignal_RTS) ) {
5637 info->serial_signals |= SerialSignal_RTS;
5638 usc_set_serial_signals( info );
5639 info->drop_rts_on_tx_done = true;
5644 if ( info->params.mode == MGSL_MODE_ASYNC ) {
5645 if ( !info->tx_active ) {
5646 usc_UnlatchTxstatusBits(info, TXSTATUS_ALL);
5647 usc_ClearIrqPendingBits(info, TRANSMIT_STATUS + TRANSMIT_DATA);
5648 usc_EnableInterrupts(info, TRANSMIT_DATA);
5649 usc_load_txfifo(info);
5652 /* Disable transmit DMA controller while programming. */
5653 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5655 /* Transmit DMA buffer is loaded, so program USC */
5656 /* to send the frame contained in the buffers. */
5658 FrameSize = info->tx_buffer_list[info->start_tx_dma_buffer].rcc;
5660 /* if operating in Raw sync mode, reset the rcc component
5661 * of the tx dma buffer entry, otherwise, the serial controller
5662 * will send a closing sync char after this count.
5664 if ( info->params.mode == MGSL_MODE_RAW )
5665 info->tx_buffer_list[info->start_tx_dma_buffer].rcc = 0;
5667 /* Program the Transmit Character Length Register (TCLR) */
5668 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
5669 usc_OutReg( info, TCLR, (u16)FrameSize );
5671 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5673 /* Program the address of the 1st DMA Buffer Entry in linked list */
5674 phys_addr = info->tx_buffer_list[info->start_tx_dma_buffer].phys_entry;
5675 usc_OutDmaReg( info, NTARL, (u16)phys_addr );
5676 usc_OutDmaReg( info, NTARU, (u16)(phys_addr >> 16) );
5678 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5679 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
5680 usc_EnableInterrupts( info, TRANSMIT_STATUS );
5682 if ( info->params.mode == MGSL_MODE_RAW &&
5683 info->num_tx_dma_buffers > 1 ) {
5684 /* When running external sync mode, attempt to 'stream' transmit */
5685 /* by filling tx dma buffers as they become available. To do this */
5686 /* we need to enable Tx DMA EOB Status interrupts : */
5688 /* 1. Arm End of Buffer (EOB) Transmit DMA Interrupt (BIT2 of TDIAR) */
5689 /* 2. Enable Transmit DMA Interrupts (BIT0 of DICR) */
5691 usc_OutDmaReg( info, TDIAR, BIT2|BIT3 );
5692 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT0) );
5695 /* Initialize Transmit DMA Channel */
5696 usc_DmaCmd( info, DmaCmd_InitTxChannel );
5698 usc_TCmd( info, TCmd_SendFrame );
5700 mod_timer(&info->tx_timer, jiffies +
5701 msecs_to_jiffies(5000));
5703 info->tx_active = true;
5706 if ( !info->tx_enabled ) {
5707 info->tx_enabled = true;
5708 if ( info->params.flags & HDLC_FLAG_AUTO_CTS )
5709 usc_EnableTransmitter(info,ENABLE_AUTO_CTS);
5711 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
5714 } /* end of usc_start_transmitter() */
5716 /* usc_stop_transmitter()
5718 * Stops the transmitter and DMA
5720 * Arguments: info pointer to device isntance data
5721 * Return Value: None
5723 static void usc_stop_transmitter( struct mgsl_struct *info )
5725 if (debug_level >= DEBUG_LEVEL_ISR)
5726 printk("%s(%d):usc_stop_transmitter(%s)\n",
5727 __FILE__,__LINE__, info->device_name );
5729 del_timer(&info->tx_timer);
5731 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5732 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5733 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5735 usc_EnableTransmitter(info,DISABLE_UNCONDITIONAL);
5736 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5737 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5739 info->tx_enabled = false;
5740 info->tx_active = false;
5742 } /* end of usc_stop_transmitter() */
5744 /* usc_load_txfifo()
5746 * Fill the transmit FIFO until the FIFO is full or
5747 * there is no more data to load.
5749 * Arguments: info pointer to device extension (instance data)
5750 * Return Value: None
5752 static void usc_load_txfifo( struct mgsl_struct *info )
5757 if ( !info->xmit_cnt && !info->x_char )
5760 /* Select transmit FIFO status readback in TICR */
5761 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
5763 /* load the Transmit FIFO until FIFOs full or all data sent */
5765 while( (Fifocount = usc_InReg(info, TICR) >> 8) && info->xmit_cnt ) {
5766 /* there is more space in the transmit FIFO and */
5767 /* there is more data in transmit buffer */
5769 if ( (info->xmit_cnt > 1) && (Fifocount > 1) && !info->x_char ) {
5770 /* write a 16-bit word from transmit buffer to 16C32 */
5772 TwoBytes[0] = info->xmit_buf[info->xmit_tail++];
5773 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5774 TwoBytes[1] = info->xmit_buf[info->xmit_tail++];
5775 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5777 outw( *((u16 *)TwoBytes), info->io_base + DATAREG);
5779 info->xmit_cnt -= 2;
5780 info->icount.tx += 2;
5782 /* only 1 byte left to transmit or 1 FIFO slot left */
5784 outw( (inw( info->io_base + CCAR) & 0x0780) | (TDR+LSBONLY),
5785 info->io_base + CCAR );
5788 /* transmit pending high priority char */
5789 outw( info->x_char,info->io_base + CCAR );
5792 outw( info->xmit_buf[info->xmit_tail++],info->io_base + CCAR );
5793 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5800 } /* end of usc_load_txfifo() */
5804 * Reset the adapter to a known state and prepare it for further use.
5806 * Arguments: info pointer to device instance data
5807 * Return Value: None
5809 static void usc_reset( struct mgsl_struct *info )
5811 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5815 /* Set BIT30 of Misc Control Register */
5816 /* (Local Control Register 0x50) to force reset of USC. */
5818 volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5819 u32 *LCR0BRDR = (u32 *)(info->lcr_base + 0x28);
5821 info->misc_ctrl_value |= BIT30;
5822 *MiscCtrl = info->misc_ctrl_value;
5825 * Force at least 170ns delay before clearing
5826 * reset bit. Each read from LCR takes at least
5827 * 30ns so 10 times for 300ns to be safe.
5830 readval = *MiscCtrl;
5832 info->misc_ctrl_value &= ~BIT30;
5833 *MiscCtrl = info->misc_ctrl_value;
5835 *LCR0BRDR = BUS_DESCRIPTOR(
5836 1, // Write Strobe Hold (0-3)
5837 2, // Write Strobe Delay (0-3)
5838 2, // Read Strobe Delay (0-3)
5839 0, // NWDD (Write data-data) (0-3)
5840 4, // NWAD (Write Addr-data) (0-31)
5841 0, // NXDA (Read/Write Data-Addr) (0-3)
5842 0, // NRDD (Read Data-Data) (0-3)
5843 5 // NRAD (Read Addr-Data) (0-31)
5847 outb( 0,info->io_base + 8 );
5851 info->loopback_bits = 0;
5852 info->usc_idle_mode = 0;
5855 * Program the Bus Configuration Register (BCR)
5857 * <15> 0 Don't use separate address
5858 * <14..6> 0 reserved
5859 * <5..4> 00 IAckmode = Default, don't care
5860 * <3> 1 Bus Request Totem Pole output
5861 * <2> 1 Use 16 Bit data bus
5862 * <1> 0 IRQ Totem Pole output
5863 * <0> 0 Don't Shift Right Addr
5865 * 0000 0000 0000 1100 = 0x000c
5867 * By writing to io_base + SDPIN the Wait/Ack pin is
5868 * programmed to work as a Wait pin.
5871 outw( 0x000c,info->io_base + SDPIN );
5874 outw( 0,info->io_base );
5875 outw( 0,info->io_base + CCAR );
5877 /* select little endian byte ordering */
5878 usc_RTCmd( info, RTCmd_SelectLittleEndian );
5881 /* Port Control Register (PCR)
5883 * <15..14> 11 Port 7 is Output (~DMAEN, Bit 14 : 0 = Enabled)
5884 * <13..12> 11 Port 6 is Output (~INTEN, Bit 12 : 0 = Enabled)
5885 * <11..10> 00 Port 5 is Input (No Connect, Don't Care)
5886 * <9..8> 00 Port 4 is Input (No Connect, Don't Care)
5887 * <7..6> 11 Port 3 is Output (~RTS, Bit 6 : 0 = Enabled )
5888 * <5..4> 11 Port 2 is Output (~DTR, Bit 4 : 0 = Enabled )
5889 * <3..2> 01 Port 1 is Input (Dedicated RxC)
5890 * <1..0> 01 Port 0 is Input (Dedicated TxC)
5892 * 1111 0000 1111 0101 = 0xf0f5
5895 usc_OutReg( info, PCR, 0xf0f5 );
5899 * Input/Output Control Register
5901 * <15..14> 00 CTS is active low input
5902 * <13..12> 00 DCD is active low input
5903 * <11..10> 00 TxREQ pin is input (DSR)
5904 * <9..8> 00 RxREQ pin is input (RI)
5905 * <7..6> 00 TxD is output (Transmit Data)
5906 * <5..3> 000 TxC Pin in Input (14.7456MHz Clock)
5907 * <2..0> 100 RxC is Output (drive with BRG0)
5909 * 0000 0000 0000 0100 = 0x0004
5912 usc_OutReg( info, IOCR, 0x0004 );
5914 } /* end of usc_reset() */
5916 /* usc_set_async_mode()
5918 * Program adapter for asynchronous communications.
5920 * Arguments: info pointer to device instance data
5921 * Return Value: None
5923 static void usc_set_async_mode( struct mgsl_struct *info )
5927 /* disable interrupts while programming USC */
5928 usc_DisableMasterIrqBit( info );
5930 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5931 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5933 usc_loopback_frame( info );
5935 /* Channel mode Register (CMR)
5937 * <15..14> 00 Tx Sub modes, 00 = 1 Stop Bit
5938 * <13..12> 00 00 = 16X Clock
5939 * <11..8> 0000 Transmitter mode = Asynchronous
5940 * <7..6> 00 reserved?
5941 * <5..4> 00 Rx Sub modes, 00 = 16X Clock
5942 * <3..0> 0000 Receiver mode = Asynchronous
5944 * 0000 0000 0000 0000 = 0x0
5948 if ( info->params.stop_bits != 1 )
5950 usc_OutReg( info, CMR, RegValue );
5953 /* Receiver mode Register (RMR)
5955 * <15..13> 000 encoding = None
5956 * <12..08> 00000 reserved (Sync Only)
5957 * <7..6> 00 Even parity
5958 * <5> 0 parity disabled
5959 * <4..2> 000 Receive Char Length = 8 bits
5960 * <1..0> 00 Disable Receiver
5962 * 0000 0000 0000 0000 = 0x0
5967 if ( info->params.data_bits != 8 )
5968 RegValue |= BIT4+BIT3+BIT2;
5970 if ( info->params.parity != ASYNC_PARITY_NONE ) {
5972 if ( info->params.parity != ASYNC_PARITY_ODD )
5976 usc_OutReg( info, RMR, RegValue );
5979 /* Set IRQ trigger level */
5981 usc_RCmd( info, RCmd_SelectRicrIntLevel );
5984 /* Receive Interrupt Control Register (RICR)
5986 * <15..8> ? RxFIFO IRQ Request Level
5988 * Note: For async mode the receive FIFO level must be set
5989 * to 0 to avoid the situation where the FIFO contains fewer bytes
5990 * than the trigger level and no more data is expected.
5992 * <7> 0 Exited Hunt IA (Interrupt Arm)
5993 * <6> 0 Idle Received IA
5994 * <5> 0 Break/Abort IA
5996 * <3> 0 Queued status reflects oldest byte in FIFO
5998 * <1> 0 Rx Overrun IA
5999 * <0> 0 Select TC0 value for readback
6001 * 0000 0000 0100 0000 = 0x0000 + (FIFOLEVEL in MSB)
6004 usc_OutReg( info, RICR, 0x0000 );
6006 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
6007 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
6010 /* Transmit mode Register (TMR)
6012 * <15..13> 000 encoding = None
6013 * <12..08> 00000 reserved (Sync Only)
6014 * <7..6> 00 Transmit parity Even
6015 * <5> 0 Transmit parity Disabled
6016 * <4..2> 000 Tx Char Length = 8 bits
6017 * <1..0> 00 Disable Transmitter
6019 * 0000 0000 0000 0000 = 0x0
6024 if ( info->params.data_bits != 8 )
6025 RegValue |= BIT4+BIT3+BIT2;
6027 if ( info->params.parity != ASYNC_PARITY_NONE ) {
6029 if ( info->params.parity != ASYNC_PARITY_ODD )
6033 usc_OutReg( info, TMR, RegValue );
6035 usc_set_txidle( info );
6038 /* Set IRQ trigger level */
6040 usc_TCmd( info, TCmd_SelectTicrIntLevel );
6043 /* Transmit Interrupt Control Register (TICR)
6045 * <15..8> ? Transmit FIFO IRQ Level
6046 * <7> 0 Present IA (Interrupt Arm)
6047 * <6> 1 Idle Sent IA
6048 * <5> 0 Abort Sent IA
6049 * <4> 0 EOF/EOM Sent IA
6051 * <2> 0 1 = Wait for SW Trigger to Start Frame
6052 * <1> 0 Tx Underrun IA
6053 * <0> 0 TC0 constant on read back
6055 * 0000 0000 0100 0000 = 0x0040
6058 usc_OutReg( info, TICR, 0x1f40 );
6060 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
6061 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
6063 usc_enable_async_clock( info, info->params.data_rate );
6066 /* Channel Control/status Register (CCSR)
6068 * <15> X RCC FIFO Overflow status (RO)
6069 * <14> X RCC FIFO Not Empty status (RO)
6070 * <13> 0 1 = Clear RCC FIFO (WO)
6071 * <12> X DPLL in Sync status (RO)
6072 * <11> X DPLL 2 Missed Clocks status (RO)
6073 * <10> X DPLL 1 Missed Clock status (RO)
6074 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
6075 * <7> X SDLC Loop On status (RO)
6076 * <6> X SDLC Loop Send status (RO)
6077 * <5> 1 Bypass counters for TxClk and RxClk (RW)
6078 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
6079 * <1..0> 00 reserved
6081 * 0000 0000 0010 0000 = 0x0020
6084 usc_OutReg( info, CCSR, 0x0020 );
6086 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6087 RECEIVE_DATA + RECEIVE_STATUS );
6089 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6090 RECEIVE_DATA + RECEIVE_STATUS );
6092 usc_EnableMasterIrqBit( info );
6094 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6095 /* Enable INTEN (Port 6, Bit12) */
6096 /* This connects the IRQ request signal to the ISA bus */
6097 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6100 if (info->params.loopback) {
6101 info->loopback_bits = 0x300;
6102 outw(0x0300, info->io_base + CCAR);
6105 } /* end of usc_set_async_mode() */
6107 /* usc_loopback_frame()
6109 * Loop back a small (2 byte) dummy SDLC frame.
6110 * Interrupts and DMA are NOT used. The purpose of this is to
6111 * clear any 'stale' status info left over from running in async mode.
6113 * The 16C32 shows the strange behaviour of marking the 1st
6114 * received SDLC frame with a CRC error even when there is no
6115 * CRC error. To get around this a small dummy from of 2 bytes
6116 * is looped back when switching from async to sync mode.
6118 * Arguments: info pointer to device instance data
6119 * Return Value: None
6121 static void usc_loopback_frame( struct mgsl_struct *info )
6124 unsigned long oldmode = info->params.mode;
6126 info->params.mode = MGSL_MODE_HDLC;
6128 usc_DisableMasterIrqBit( info );
6130 usc_set_sdlc_mode( info );
6131 usc_enable_loopback( info, 1 );
6133 /* Write 16-bit Time Constant for BRG0 */
6134 usc_OutReg( info, TC0R, 0 );
6136 /* Channel Control Register (CCR)
6138 * <15..14> 00 Don't use 32-bit Tx Control Blocks (TCBs)
6139 * <13> 0 Trigger Tx on SW Command Disabled
6140 * <12> 0 Flag Preamble Disabled
6141 * <11..10> 00 Preamble Length = 8-Bits
6142 * <9..8> 01 Preamble Pattern = flags
6143 * <7..6> 10 Don't use 32-bit Rx status Blocks (RSBs)
6144 * <5> 0 Trigger Rx on SW Command Disabled
6147 * 0000 0001 0000 0000 = 0x0100
6150 usc_OutReg( info, CCR, 0x0100 );
6152 /* SETUP RECEIVER */
6153 usc_RTCmd( info, RTCmd_PurgeRxFifo );
6154 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
6156 /* SETUP TRANSMITTER */
6157 /* Program the Transmit Character Length Register (TCLR) */
6158 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
6159 usc_OutReg( info, TCLR, 2 );
6160 usc_RTCmd( info, RTCmd_PurgeTxFifo );
6162 /* unlatch Tx status bits, and start transmit channel. */
6163 usc_UnlatchTxstatusBits(info,TXSTATUS_ALL);
6164 outw(0,info->io_base + DATAREG);
6166 /* ENABLE TRANSMITTER */
6167 usc_TCmd( info, TCmd_SendFrame );
6168 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
6170 /* WAIT FOR RECEIVE COMPLETE */
6171 for (i=0 ; i<1000 ; i++)
6172 if (usc_InReg( info, RCSR ) & (BIT8 + BIT4 + BIT3 + BIT1))
6175 /* clear Internal Data loopback mode */
6176 usc_enable_loopback(info, 0);
6178 usc_EnableMasterIrqBit(info);
6180 info->params.mode = oldmode;
6182 } /* end of usc_loopback_frame() */
6184 /* usc_set_sync_mode() Programs the USC for SDLC communications.
6186 * Arguments: info pointer to adapter info structure
6187 * Return Value: None
6189 static void usc_set_sync_mode( struct mgsl_struct *info )
6191 usc_loopback_frame( info );
6192 usc_set_sdlc_mode( info );
6194 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6195 /* Enable INTEN (Port 6, Bit12) */
6196 /* This connects the IRQ request signal to the ISA bus */
6197 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6200 usc_enable_aux_clock(info, info->params.clock_speed);
6202 if (info->params.loopback)
6203 usc_enable_loopback(info,1);
6205 } /* end of mgsl_set_sync_mode() */
6207 /* usc_set_txidle() Set the HDLC idle mode for the transmitter.
6209 * Arguments: info pointer to device instance data
6210 * Return Value: None
6212 static void usc_set_txidle( struct mgsl_struct *info )
6214 u16 usc_idle_mode = IDLEMODE_FLAGS;
6216 /* Map API idle mode to USC register bits */
6218 switch( info->idle_mode ){
6219 case HDLC_TXIDLE_FLAGS: usc_idle_mode = IDLEMODE_FLAGS; break;
6220 case HDLC_TXIDLE_ALT_ZEROS_ONES: usc_idle_mode = IDLEMODE_ALT_ONE_ZERO; break;
6221 case HDLC_TXIDLE_ZEROS: usc_idle_mode = IDLEMODE_ZERO; break;
6222 case HDLC_TXIDLE_ONES: usc_idle_mode = IDLEMODE_ONE; break;
6223 case HDLC_TXIDLE_ALT_MARK_SPACE: usc_idle_mode = IDLEMODE_ALT_MARK_SPACE; break;
6224 case HDLC_TXIDLE_SPACE: usc_idle_mode = IDLEMODE_SPACE; break;
6225 case HDLC_TXIDLE_MARK: usc_idle_mode = IDLEMODE_MARK; break;
6228 info->usc_idle_mode = usc_idle_mode;
6229 //usc_OutReg(info, TCSR, usc_idle_mode);
6230 info->tcsr_value &= ~IDLEMODE_MASK; /* clear idle mode bits */
6231 info->tcsr_value += usc_idle_mode;
6232 usc_OutReg(info, TCSR, info->tcsr_value);
6235 * if SyncLink WAN adapter is running in external sync mode, the
6236 * transmitter has been set to Monosync in order to try to mimic
6237 * a true raw outbound bit stream. Monosync still sends an open/close
6238 * sync char at the start/end of a frame. Try to match those sync
6239 * patterns to the idle mode set here
6241 if ( info->params.mode == MGSL_MODE_RAW ) {
6242 unsigned char syncpat = 0;
6243 switch( info->idle_mode ) {
6244 case HDLC_TXIDLE_FLAGS:
6247 case HDLC_TXIDLE_ALT_ZEROS_ONES:
6250 case HDLC_TXIDLE_ZEROS:
6251 case HDLC_TXIDLE_SPACE:
6254 case HDLC_TXIDLE_ONES:
6255 case HDLC_TXIDLE_MARK:
6258 case HDLC_TXIDLE_ALT_MARK_SPACE:
6263 usc_SetTransmitSyncChars(info,syncpat,syncpat);
6266 } /* end of usc_set_txidle() */
6268 /* usc_get_serial_signals()
6270 * Query the adapter for the state of the V24 status (input) signals.
6272 * Arguments: info pointer to device instance data
6273 * Return Value: None
6275 static void usc_get_serial_signals( struct mgsl_struct *info )
6279 /* clear all serial signals except DTR and RTS */
6280 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
6282 /* Read the Misc Interrupt status Register (MISR) to get */
6283 /* the V24 status signals. */
6285 status = usc_InReg( info, MISR );
6287 /* set serial signal bits to reflect MISR */
6289 if ( status & MISCSTATUS_CTS )
6290 info->serial_signals |= SerialSignal_CTS;
6292 if ( status & MISCSTATUS_DCD )
6293 info->serial_signals |= SerialSignal_DCD;
6295 if ( status & MISCSTATUS_RI )
6296 info->serial_signals |= SerialSignal_RI;
6298 if ( status & MISCSTATUS_DSR )
6299 info->serial_signals |= SerialSignal_DSR;
6301 } /* end of usc_get_serial_signals() */
6303 /* usc_set_serial_signals()
6305 * Set the state of DTR and RTS based on contents of
6306 * serial_signals member of device extension.
6308 * Arguments: info pointer to device instance data
6309 * Return Value: None
6311 static void usc_set_serial_signals( struct mgsl_struct *info )
6314 unsigned char V24Out = info->serial_signals;
6316 /* get the current value of the Port Control Register (PCR) */
6318 Control = usc_InReg( info, PCR );
6320 if ( V24Out & SerialSignal_RTS )
6325 if ( V24Out & SerialSignal_DTR )
6330 usc_OutReg( info, PCR, Control );
6332 } /* end of usc_set_serial_signals() */
6334 /* usc_enable_async_clock()
6336 * Enable the async clock at the specified frequency.
6338 * Arguments: info pointer to device instance data
6339 * data_rate data rate of clock in bps
6340 * 0 disables the AUX clock.
6341 * Return Value: None
6343 static void usc_enable_async_clock( struct mgsl_struct *info, u32 data_rate )
6347 * Clock mode Control Register (CMCR)
6349 * <15..14> 00 counter 1 Disabled
6350 * <13..12> 00 counter 0 Disabled
6351 * <11..10> 11 BRG1 Input is TxC Pin
6352 * <9..8> 11 BRG0 Input is TxC Pin
6353 * <7..6> 01 DPLL Input is BRG1 Output
6354 * <5..3> 100 TxCLK comes from BRG0
6355 * <2..0> 100 RxCLK comes from BRG0
6357 * 0000 1111 0110 0100 = 0x0f64
6360 usc_OutReg( info, CMCR, 0x0f64 );
6364 * Write 16-bit Time Constant for BRG0
6365 * Time Constant = (ClkSpeed / data_rate) - 1
6366 * ClkSpeed = 921600 (ISA), 691200 (PCI)
6369 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6370 usc_OutReg( info, TC0R, (u16)((691200/data_rate) - 1) );
6372 usc_OutReg( info, TC0R, (u16)((921600/data_rate) - 1) );
6376 * Hardware Configuration Register (HCR)
6377 * Clear Bit 1, BRG0 mode = Continuous
6378 * Set Bit 0 to enable BRG0.
6381 usc_OutReg( info, HCR,
6382 (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
6385 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
6387 usc_OutReg( info, IOCR,
6388 (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
6390 /* data rate == 0 so turn off BRG0 */
6391 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
6394 } /* end of usc_enable_async_clock() */
6397 * Buffer Structures:
6399 * Normal memory access uses virtual addresses that can make discontiguous
6400 * physical memory pages appear to be contiguous in the virtual address
6401 * space (the processors memory mapping handles the conversions).
6403 * DMA transfers require physically contiguous memory. This is because
6404 * the DMA system controller and DMA bus masters deal with memory using
6405 * only physical addresses.
6407 * This causes a problem under Windows NT when large DMA buffers are
6408 * needed. Fragmentation of the nonpaged pool prevents allocations of
6409 * physically contiguous buffers larger than the PAGE_SIZE.
6411 * However the 16C32 supports Bus Master Scatter/Gather DMA which
6412 * allows DMA transfers to physically discontiguous buffers. Information
6413 * about each data transfer buffer is contained in a memory structure
6414 * called a 'buffer entry'. A list of buffer entries is maintained
6415 * to track and control the use of the data transfer buffers.
6417 * To support this strategy we will allocate sufficient PAGE_SIZE
6418 * contiguous memory buffers to allow for the total required buffer
6421 * The 16C32 accesses the list of buffer entries using Bus Master
6422 * DMA. Control information is read from the buffer entries by the
6423 * 16C32 to control data transfers. status information is written to
6424 * the buffer entries by the 16C32 to indicate the status of completed
6427 * The CPU writes control information to the buffer entries to control
6428 * the 16C32 and reads status information from the buffer entries to
6429 * determine information about received and transmitted frames.
6431 * Because the CPU and 16C32 (adapter) both need simultaneous access
6432 * to the buffer entries, the buffer entry memory is allocated with
6433 * HalAllocateCommonBuffer(). This restricts the size of the buffer
6434 * entry list to PAGE_SIZE.
6436 * The actual data buffers on the other hand will only be accessed
6437 * by the CPU or the adapter but not by both simultaneously. This allows
6438 * Scatter/Gather packet based DMA procedures for using physically
6439 * discontiguous pages.
6443 * mgsl_reset_tx_dma_buffers()
6445 * Set the count for all transmit buffers to 0 to indicate the
6446 * buffer is available for use and set the current buffer to the
6447 * first buffer. This effectively makes all buffers free and
6448 * discards any data in buffers.
6450 * Arguments: info pointer to device instance data
6451 * Return Value: None
6453 static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info )
6457 for ( i = 0; i < info->tx_buffer_count; i++ ) {
6458 *((unsigned long *)&(info->tx_buffer_list[i].count)) = 0;
6461 info->current_tx_buffer = 0;
6462 info->start_tx_dma_buffer = 0;
6463 info->tx_dma_buffers_used = 0;
6465 info->get_tx_holding_index = 0;
6466 info->put_tx_holding_index = 0;
6467 info->tx_holding_count = 0;
6469 } /* end of mgsl_reset_tx_dma_buffers() */
6472 * num_free_tx_dma_buffers()
6474 * returns the number of free tx dma buffers available
6476 * Arguments: info pointer to device instance data
6477 * Return Value: number of free tx dma buffers
6479 static int num_free_tx_dma_buffers(struct mgsl_struct *info)
6481 return info->tx_buffer_count - info->tx_dma_buffers_used;
6485 * mgsl_reset_rx_dma_buffers()
6487 * Set the count for all receive buffers to DMABUFFERSIZE
6488 * and set the current buffer to the first buffer. This effectively
6489 * makes all buffers free and discards any data in buffers.
6491 * Arguments: info pointer to device instance data
6492 * Return Value: None
6494 static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info )
6498 for ( i = 0; i < info->rx_buffer_count; i++ ) {
6499 *((unsigned long *)&(info->rx_buffer_list[i].count)) = DMABUFFERSIZE;
6500 // info->rx_buffer_list[i].count = DMABUFFERSIZE;
6501 // info->rx_buffer_list[i].status = 0;
6504 info->current_rx_buffer = 0;
6506 } /* end of mgsl_reset_rx_dma_buffers() */
6509 * mgsl_free_rx_frame_buffers()
6511 * Free the receive buffers used by a received SDLC
6512 * frame such that the buffers can be reused.
6516 * info pointer to device instance data
6517 * StartIndex index of 1st receive buffer of frame
6518 * EndIndex index of last receive buffer of frame
6520 * Return Value: None
6522 static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex )
6525 DMABUFFERENTRY *pBufEntry;
6528 /* Starting with 1st buffer entry of the frame clear the status */
6529 /* field and set the count field to DMA Buffer Size. */
6534 pBufEntry = &(info->rx_buffer_list[Index]);
6536 if ( Index == EndIndex ) {
6537 /* This is the last buffer of the frame! */
6541 /* reset current buffer for reuse */
6542 // pBufEntry->status = 0;
6543 // pBufEntry->count = DMABUFFERSIZE;
6544 *((unsigned long *)&(pBufEntry->count)) = DMABUFFERSIZE;
6546 /* advance to next buffer entry in linked list */
6548 if ( Index == info->rx_buffer_count )
6552 /* set current buffer to next buffer after last buffer of frame */
6553 info->current_rx_buffer = Index;
6555 } /* end of free_rx_frame_buffers() */
6557 /* mgsl_get_rx_frame()
6559 * This function attempts to return a received SDLC frame from the
6560 * receive DMA buffers. Only frames received without errors are returned.
6562 * Arguments: info pointer to device extension
6563 * Return Value: true if frame returned, otherwise false
6565 static bool mgsl_get_rx_frame(struct mgsl_struct *info)
6567 unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
6568 unsigned short status;
6569 DMABUFFERENTRY *pBufEntry;
6570 unsigned int framesize = 0;
6571 bool ReturnCode = false;
6572 unsigned long flags;
6573 struct tty_struct *tty = info->tty;
6574 bool return_frame = false;
6577 * current_rx_buffer points to the 1st buffer of the next available
6578 * receive frame. To find the last buffer of the frame look for
6579 * a non-zero status field in the buffer entries. (The status
6580 * field is set by the 16C32 after completing a receive frame.
6583 StartIndex = EndIndex = info->current_rx_buffer;
6585 while( !info->rx_buffer_list[EndIndex].status ) {
6587 * If the count field of the buffer entry is non-zero then
6588 * this buffer has not been used. (The 16C32 clears the count
6589 * field when it starts using the buffer.) If an unused buffer
6590 * is encountered then there are no frames available.
6593 if ( info->rx_buffer_list[EndIndex].count )
6596 /* advance to next buffer entry in linked list */
6598 if ( EndIndex == info->rx_buffer_count )
6601 /* if entire list searched then no frame available */
6602 if ( EndIndex == StartIndex ) {
6603 /* If this occurs then something bad happened,
6604 * all buffers have been 'used' but none mark
6605 * the end of a frame. Reset buffers and receiver.
6608 if ( info->rx_enabled ){
6609 spin_lock_irqsave(&info->irq_spinlock,flags);
6610 usc_start_receiver(info);
6611 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6618 /* check status of receive frame */
6620 status = info->rx_buffer_list[EndIndex].status;
6622 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6623 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6624 if ( status & RXSTATUS_SHORT_FRAME )
6625 info->icount.rxshort++;
6626 else if ( status & RXSTATUS_ABORT )
6627 info->icount.rxabort++;
6628 else if ( status & RXSTATUS_OVERRUN )
6629 info->icount.rxover++;
6631 info->icount.rxcrc++;
6632 if ( info->params.crc_type & HDLC_CRC_RETURN_EX )
6633 return_frame = true;
6636 #if SYNCLINK_GENERIC_HDLC
6638 struct net_device_stats *stats = hdlc_stats(info->netdev);
6640 stats->rx_frame_errors++;
6644 return_frame = true;
6646 if ( return_frame ) {
6647 /* receive frame has no errors, get frame size.
6648 * The frame size is the starting value of the RCC (which was
6649 * set to 0xffff) minus the ending value of the RCC (decremented
6650 * once for each receive character) minus 2 for the 16-bit CRC.
6653 framesize = RCLRVALUE - info->rx_buffer_list[EndIndex].rcc;
6655 /* adjust frame size for CRC if any */
6656 if ( info->params.crc_type == HDLC_CRC_16_CCITT )
6658 else if ( info->params.crc_type == HDLC_CRC_32_CCITT )
6662 if ( debug_level >= DEBUG_LEVEL_BH )
6663 printk("%s(%d):mgsl_get_rx_frame(%s) status=%04X size=%d\n",
6664 __FILE__,__LINE__,info->device_name,status,framesize);
6666 if ( debug_level >= DEBUG_LEVEL_DATA )
6667 mgsl_trace_block(info,info->rx_buffer_list[StartIndex].virt_addr,
6668 min_t(int, framesize, DMABUFFERSIZE),0);
6671 if ( ( (info->params.crc_type & HDLC_CRC_RETURN_EX) &&
6672 ((framesize+1) > info->max_frame_size) ) ||
6673 (framesize > info->max_frame_size) )
6674 info->icount.rxlong++;
6676 /* copy dma buffer(s) to contiguous intermediate buffer */
6677 int copy_count = framesize;
6678 int index = StartIndex;
6679 unsigned char *ptmp = info->intermediate_rxbuffer;
6681 if ( !(status & RXSTATUS_CRC_ERROR))
6682 info->icount.rxok++;
6686 if ( copy_count > DMABUFFERSIZE )
6687 partial_count = DMABUFFERSIZE;
6689 partial_count = copy_count;
6691 pBufEntry = &(info->rx_buffer_list[index]);
6692 memcpy( ptmp, pBufEntry->virt_addr, partial_count );
6693 ptmp += partial_count;
6694 copy_count -= partial_count;
6696 if ( ++index == info->rx_buffer_count )
6700 if ( info->params.crc_type & HDLC_CRC_RETURN_EX ) {
6702 *ptmp = (status & RXSTATUS_CRC_ERROR ?
6706 if ( debug_level >= DEBUG_LEVEL_DATA )
6707 printk("%s(%d):mgsl_get_rx_frame(%s) rx frame status=%d\n",
6708 __FILE__,__LINE__,info->device_name,
6712 #if SYNCLINK_GENERIC_HDLC
6714 hdlcdev_rx(info,info->intermediate_rxbuffer,framesize);
6717 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6720 /* Free the buffers used by this frame. */
6721 mgsl_free_rx_frame_buffers( info, StartIndex, EndIndex );
6727 if ( info->rx_enabled && info->rx_overflow ) {
6728 /* The receiver needs to restarted because of
6729 * a receive overflow (buffer or FIFO). If the
6730 * receive buffers are now empty, then restart receiver.
6733 if ( !info->rx_buffer_list[EndIndex].status &&
6734 info->rx_buffer_list[EndIndex].count ) {
6735 spin_lock_irqsave(&info->irq_spinlock,flags);
6736 usc_start_receiver(info);
6737 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6743 } /* end of mgsl_get_rx_frame() */
6745 /* mgsl_get_raw_rx_frame()
6747 * This function attempts to return a received frame from the
6748 * receive DMA buffers when running in external loop mode. In this mode,
6749 * we will return at most one DMABUFFERSIZE frame to the application.
6750 * The USC receiver is triggering off of DCD going active to start a new
6751 * frame, and DCD going inactive to terminate the frame (similar to
6752 * processing a closing flag character).
6754 * In this routine, we will return DMABUFFERSIZE "chunks" at a time.
6755 * If DCD goes inactive, the last Rx DMA Buffer will have a non-zero
6756 * status field and the RCC field will indicate the length of the
6757 * entire received frame. We take this RCC field and get the modulus
6758 * of RCC and DMABUFFERSIZE to determine if number of bytes in the
6759 * last Rx DMA buffer and return that last portion of the frame.
6761 * Arguments: info pointer to device extension
6762 * Return Value: true if frame returned, otherwise false
6764 static bool mgsl_get_raw_rx_frame(struct mgsl_struct *info)
6766 unsigned int CurrentIndex, NextIndex;
6767 unsigned short status;
6768 DMABUFFERENTRY *pBufEntry;
6769 unsigned int framesize = 0;
6770 bool ReturnCode = false;
6771 unsigned long flags;
6772 struct tty_struct *tty = info->tty;
6775 * current_rx_buffer points to the 1st buffer of the next available
6776 * receive frame. The status field is set by the 16C32 after
6777 * completing a receive frame. If the status field of this buffer
6778 * is zero, either the USC is still filling this buffer or this
6779 * is one of a series of buffers making up a received frame.
6781 * If the count field of this buffer is zero, the USC is either
6782 * using this buffer or has used this buffer. Look at the count
6783 * field of the next buffer. If that next buffer's count is
6784 * non-zero, the USC is still actively using the current buffer.
6785 * Otherwise, if the next buffer's count field is zero, the
6786 * current buffer is complete and the USC is using the next
6789 CurrentIndex = NextIndex = info->current_rx_buffer;
6791 if ( NextIndex == info->rx_buffer_count )
6794 if ( info->rx_buffer_list[CurrentIndex].status != 0 ||
6795 (info->rx_buffer_list[CurrentIndex].count == 0 &&
6796 info->rx_buffer_list[NextIndex].count == 0)) {
6798 * Either the status field of this dma buffer is non-zero
6799 * (indicating the last buffer of a receive frame) or the next
6800 * buffer is marked as in use -- implying this buffer is complete
6801 * and an intermediate buffer for this received frame.
6804 status = info->rx_buffer_list[CurrentIndex].status;
6806 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6807 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6808 if ( status & RXSTATUS_SHORT_FRAME )
6809 info->icount.rxshort++;
6810 else if ( status & RXSTATUS_ABORT )
6811 info->icount.rxabort++;
6812 else if ( status & RXSTATUS_OVERRUN )
6813 info->icount.rxover++;
6815 info->icount.rxcrc++;
6819 * A receive frame is available, get frame size and status.
6821 * The frame size is the starting value of the RCC (which was
6822 * set to 0xffff) minus the ending value of the RCC (decremented
6823 * once for each receive character) minus 2 or 4 for the 16-bit
6826 * If the status field is zero, this is an intermediate buffer.
6829 * If the DMA Buffer Entry's Status field is non-zero, the
6830 * receive operation completed normally (ie: DCD dropped). The
6831 * RCC field is valid and holds the received frame size.
6832 * It is possible that the RCC field will be zero on a DMA buffer
6833 * entry with a non-zero status. This can occur if the total
6834 * frame size (number of bytes between the time DCD goes active
6835 * to the time DCD goes inactive) exceeds 65535 bytes. In this
6836 * case the 16C32 has underrun on the RCC count and appears to
6837 * stop updating this counter to let us know the actual received
6838 * frame size. If this happens (non-zero status and zero RCC),
6839 * simply return the entire RxDMA Buffer
6843 * In the event that the final RxDMA Buffer is
6844 * terminated with a non-zero status and the RCC
6845 * field is zero, we interpret this as the RCC
6846 * having underflowed (received frame > 65535 bytes).
6848 * Signal the event to the user by passing back
6849 * a status of RxStatus_CrcError returning the full
6850 * buffer and let the app figure out what data is
6853 if ( info->rx_buffer_list[CurrentIndex].rcc )
6854 framesize = RCLRVALUE - info->rx_buffer_list[CurrentIndex].rcc;
6856 framesize = DMABUFFERSIZE;
6859 framesize = DMABUFFERSIZE;
6862 if ( framesize > DMABUFFERSIZE ) {
6864 * if running in raw sync mode, ISR handler for
6865 * End Of Buffer events terminates all buffers at 4K.
6866 * If this frame size is said to be >4K, get the
6867 * actual number of bytes of the frame in this buffer.
6869 framesize = framesize % DMABUFFERSIZE;
6873 if ( debug_level >= DEBUG_LEVEL_BH )
6874 printk("%s(%d):mgsl_get_raw_rx_frame(%s) status=%04X size=%d\n",
6875 __FILE__,__LINE__,info->device_name,status,framesize);
6877 if ( debug_level >= DEBUG_LEVEL_DATA )
6878 mgsl_trace_block(info,info->rx_buffer_list[CurrentIndex].virt_addr,
6879 min_t(int, framesize, DMABUFFERSIZE),0);
6882 /* copy dma buffer(s) to contiguous intermediate buffer */
6883 /* NOTE: we never copy more than DMABUFFERSIZE bytes */
6885 pBufEntry = &(info->rx_buffer_list[CurrentIndex]);
6886 memcpy( info->intermediate_rxbuffer, pBufEntry->virt_addr, framesize);
6887 info->icount.rxok++;
6889 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6892 /* Free the buffers used by this frame. */
6893 mgsl_free_rx_frame_buffers( info, CurrentIndex, CurrentIndex );
6899 if ( info->rx_enabled && info->rx_overflow ) {
6900 /* The receiver needs to restarted because of
6901 * a receive overflow (buffer or FIFO). If the
6902 * receive buffers are now empty, then restart receiver.
6905 if ( !info->rx_buffer_list[CurrentIndex].status &&
6906 info->rx_buffer_list[CurrentIndex].count ) {
6907 spin_lock_irqsave(&info->irq_spinlock,flags);
6908 usc_start_receiver(info);
6909 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6915 } /* end of mgsl_get_raw_rx_frame() */
6917 /* mgsl_load_tx_dma_buffer()
6919 * Load the transmit DMA buffer with the specified data.
6923 * info pointer to device extension
6924 * Buffer pointer to buffer containing frame to load
6925 * BufferSize size in bytes of frame in Buffer
6927 * Return Value: None
6929 static void mgsl_load_tx_dma_buffer(struct mgsl_struct *info,
6930 const char *Buffer, unsigned int BufferSize)
6932 unsigned short Copycount;
6934 DMABUFFERENTRY *pBufEntry;
6936 if ( debug_level >= DEBUG_LEVEL_DATA )
6937 mgsl_trace_block(info,Buffer, min_t(int, BufferSize, DMABUFFERSIZE), 1);
6939 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
6940 /* set CMR:13 to start transmit when
6941 * next GoAhead (abort) is received
6943 info->cmr_value |= BIT13;
6946 /* begin loading the frame in the next available tx dma
6947 * buffer, remember it's starting location for setting
6948 * up tx dma operation
6950 i = info->current_tx_buffer;
6951 info->start_tx_dma_buffer = i;
6953 /* Setup the status and RCC (Frame Size) fields of the 1st */
6954 /* buffer entry in the transmit DMA buffer list. */
6956 info->tx_buffer_list[i].status = info->cmr_value & 0xf000;
6957 info->tx_buffer_list[i].rcc = BufferSize;
6958 info->tx_buffer_list[i].count = BufferSize;
6960 /* Copy frame data from 1st source buffer to the DMA buffers. */
6961 /* The frame data may span multiple DMA buffers. */
6963 while( BufferSize ){
6964 /* Get a pointer to next DMA buffer entry. */
6965 pBufEntry = &info->tx_buffer_list[i++];
6967 if ( i == info->tx_buffer_count )
6970 /* Calculate the number of bytes that can be copied from */
6971 /* the source buffer to this DMA buffer. */
6972 if ( BufferSize > DMABUFFERSIZE )
6973 Copycount = DMABUFFERSIZE;
6975 Copycount = BufferSize;
6977 /* Actually copy data from source buffer to DMA buffer. */
6978 /* Also set the data count for this individual DMA buffer. */
6979 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6980 mgsl_load_pci_memory(pBufEntry->virt_addr, Buffer,Copycount);
6982 memcpy(pBufEntry->virt_addr, Buffer, Copycount);
6984 pBufEntry->count = Copycount;
6986 /* Advance source pointer and reduce remaining data count. */
6987 Buffer += Copycount;
6988 BufferSize -= Copycount;
6990 ++info->tx_dma_buffers_used;
6993 /* remember next available tx dma buffer */
6994 info->current_tx_buffer = i;
6996 } /* end of mgsl_load_tx_dma_buffer() */
6999 * mgsl_register_test()
7001 * Performs a register test of the 16C32.
7003 * Arguments: info pointer to device instance data
7004 * Return Value: true if test passed, otherwise false
7006 static bool mgsl_register_test( struct mgsl_struct *info )
7008 static unsigned short BitPatterns[] =
7009 { 0x0000, 0xffff, 0xaaaa, 0x5555, 0x1234, 0x6969, 0x9696, 0x0f0f };
7010 static unsigned int Patterncount = ARRAY_SIZE(BitPatterns);
7013 unsigned long flags;
7015 spin_lock_irqsave(&info->irq_spinlock,flags);
7018 /* Verify the reset state of some registers. */
7020 if ( (usc_InReg( info, SICR ) != 0) ||
7021 (usc_InReg( info, IVR ) != 0) ||
7022 (usc_InDmaReg( info, DIVR ) != 0) ){
7027 /* Write bit patterns to various registers but do it out of */
7028 /* sync, then read back and verify values. */
7030 for ( i = 0 ; i < Patterncount ; i++ ) {
7031 usc_OutReg( info, TC0R, BitPatterns[i] );
7032 usc_OutReg( info, TC1R, BitPatterns[(i+1)%Patterncount] );
7033 usc_OutReg( info, TCLR, BitPatterns[(i+2)%Patterncount] );
7034 usc_OutReg( info, RCLR, BitPatterns[(i+3)%Patterncount] );
7035 usc_OutReg( info, RSR, BitPatterns[(i+4)%Patterncount] );
7036 usc_OutDmaReg( info, TBCR, BitPatterns[(i+5)%Patterncount] );
7038 if ( (usc_InReg( info, TC0R ) != BitPatterns[i]) ||
7039 (usc_InReg( info, TC1R ) != BitPatterns[(i+1)%Patterncount]) ||
7040 (usc_InReg( info, TCLR ) != BitPatterns[(i+2)%Patterncount]) ||
7041 (usc_InReg( info, RCLR ) != BitPatterns[(i+3)%Patterncount]) ||
7042 (usc_InReg( info, RSR ) != BitPatterns[(i+4)%Patterncount]) ||
7043 (usc_InDmaReg( info, TBCR ) != BitPatterns[(i+5)%Patterncount]) ){
7051 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7055 } /* end of mgsl_register_test() */
7057 /* mgsl_irq_test() Perform interrupt test of the 16C32.
7059 * Arguments: info pointer to device instance data
7060 * Return Value: true if test passed, otherwise false
7062 static bool mgsl_irq_test( struct mgsl_struct *info )
7064 unsigned long EndTime;
7065 unsigned long flags;
7067 spin_lock_irqsave(&info->irq_spinlock,flags);
7071 * Setup 16C32 to interrupt on TxC pin (14MHz clock) transition.
7072 * The ISR sets irq_occurred to true.
7075 info->irq_occurred = false;
7077 /* Enable INTEN gate for ISA adapter (Port 6, Bit12) */
7078 /* Enable INTEN (Port 6, Bit12) */
7079 /* This connects the IRQ request signal to the ISA bus */
7080 /* on the ISA adapter. This has no effect for the PCI adapter */
7081 usc_OutReg( info, PCR, (unsigned short)((usc_InReg(info, PCR) | BIT13) & ~BIT12) );
7083 usc_EnableMasterIrqBit(info);
7084 usc_EnableInterrupts(info, IO_PIN);
7085 usc_ClearIrqPendingBits(info, IO_PIN);
7087 usc_UnlatchIostatusBits(info, MISCSTATUS_TXC_LATCHED);
7088 usc_EnableStatusIrqs(info, SICR_TXC_ACTIVE + SICR_TXC_INACTIVE);
7090 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7093 while( EndTime-- && !info->irq_occurred ) {
7094 msleep_interruptible(10);
7097 spin_lock_irqsave(&info->irq_spinlock,flags);
7099 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7101 return info->irq_occurred;
7103 } /* end of mgsl_irq_test() */
7107 * Perform a DMA test of the 16C32. A small frame is
7108 * transmitted via DMA from a transmit buffer to a receive buffer
7109 * using single buffer DMA mode.
7111 * Arguments: info pointer to device instance data
7112 * Return Value: true if test passed, otherwise false
7114 static bool mgsl_dma_test( struct mgsl_struct *info )
7116 unsigned short FifoLevel;
7117 unsigned long phys_addr;
7118 unsigned int FrameSize;
7122 unsigned short status=0;
7123 unsigned long EndTime;
7124 unsigned long flags;
7125 MGSL_PARAMS tmp_params;
7127 /* save current port options */
7128 memcpy(&tmp_params,&info->params,sizeof(MGSL_PARAMS));
7129 /* load default port options */
7130 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
7132 #define TESTFRAMESIZE 40
7134 spin_lock_irqsave(&info->irq_spinlock,flags);
7136 /* setup 16C32 for SDLC DMA transfer mode */
7139 usc_set_sdlc_mode(info);
7140 usc_enable_loopback(info,1);
7142 /* Reprogram the RDMR so that the 16C32 does NOT clear the count
7143 * field of the buffer entry after fetching buffer address. This
7144 * way we can detect a DMA failure for a DMA read (which should be
7145 * non-destructive to system memory) before we try and write to
7146 * memory (where a failure could corrupt system memory).
7149 /* Receive DMA mode Register (RDMR)
7151 * <15..14> 11 DMA mode = Linked List Buffer mode
7152 * <13> 1 RSBinA/L = store Rx status Block in List entry
7153 * <12> 0 1 = Clear count of List Entry after fetching
7154 * <11..10> 00 Address mode = Increment
7155 * <9> 1 Terminate Buffer on RxBound
7156 * <8> 0 Bus Width = 16bits
7157 * <7..0> ? status Bits (write as 0s)
7159 * 1110 0010 0000 0000 = 0xe200
7162 usc_OutDmaReg( info, RDMR, 0xe200 );
7164 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7167 /* SETUP TRANSMIT AND RECEIVE DMA BUFFERS */
7169 FrameSize = TESTFRAMESIZE;
7171 /* setup 1st transmit buffer entry: */
7172 /* with frame size and transmit control word */
7174 info->tx_buffer_list[0].count = FrameSize;
7175 info->tx_buffer_list[0].rcc = FrameSize;
7176 info->tx_buffer_list[0].status = 0x4000;
7178 /* build a transmit frame in 1st transmit DMA buffer */
7180 TmpPtr = info->tx_buffer_list[0].virt_addr;
7181 for (i = 0; i < FrameSize; i++ )
7184 /* setup 1st receive buffer entry: */
7185 /* clear status, set max receive buffer size */
7187 info->rx_buffer_list[0].status = 0;
7188 info->rx_buffer_list[0].count = FrameSize + 4;
7190 /* zero out the 1st receive buffer */
7192 memset( info->rx_buffer_list[0].virt_addr, 0, FrameSize + 4 );
7194 /* Set count field of next buffer entries to prevent */
7195 /* 16C32 from using buffers after the 1st one. */
7197 info->tx_buffer_list[1].count = 0;
7198 info->rx_buffer_list[1].count = 0;
7201 /***************************/
7202 /* Program 16C32 receiver. */
7203 /***************************/
7205 spin_lock_irqsave(&info->irq_spinlock,flags);
7207 /* setup DMA transfers */
7208 usc_RTCmd( info, RTCmd_PurgeRxFifo );
7210 /* program 16C32 receiver with physical address of 1st DMA buffer entry */
7211 phys_addr = info->rx_buffer_list[0].phys_entry;
7212 usc_OutDmaReg( info, NRARL, (unsigned short)phys_addr );
7213 usc_OutDmaReg( info, NRARU, (unsigned short)(phys_addr >> 16) );
7215 /* Clear the Rx DMA status bits (read RDMR) and start channel */
7216 usc_InDmaReg( info, RDMR );
7217 usc_DmaCmd( info, DmaCmd_InitRxChannel );
7219 /* Enable Receiver (RMR <1..0> = 10) */
7220 usc_OutReg( info, RMR, (unsigned short)((usc_InReg(info, RMR) & 0xfffc) | 0x0002) );
7222 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7225 /*************************************************************/
7226 /* WAIT FOR RECEIVER TO DMA ALL PARAMETERS FROM BUFFER ENTRY */
7227 /*************************************************************/
7229 /* Wait 100ms for interrupt. */
7230 EndTime = jiffies + msecs_to_jiffies(100);
7233 if (time_after(jiffies, EndTime)) {
7238 spin_lock_irqsave(&info->irq_spinlock,flags);
7239 status = usc_InDmaReg( info, RDMR );
7240 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7242 if ( !(status & BIT4) && (status & BIT5) ) {
7243 /* INITG (BIT 4) is inactive (no entry read in progress) AND */
7244 /* BUSY (BIT 5) is active (channel still active). */
7245 /* This means the buffer entry read has completed. */
7251 /******************************/
7252 /* Program 16C32 transmitter. */
7253 /******************************/
7255 spin_lock_irqsave(&info->irq_spinlock,flags);
7257 /* Program the Transmit Character Length Register (TCLR) */
7258 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
7260 usc_OutReg( info, TCLR, (unsigned short)info->tx_buffer_list[0].count );
7261 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7263 /* Program the address of the 1st DMA Buffer Entry in linked list */
7265 phys_addr = info->tx_buffer_list[0].phys_entry;
7266 usc_OutDmaReg( info, NTARL, (unsigned short)phys_addr );
7267 usc_OutDmaReg( info, NTARU, (unsigned short)(phys_addr >> 16) );
7269 /* unlatch Tx status bits, and start transmit channel. */
7271 usc_OutReg( info, TCSR, (unsigned short)(( usc_InReg(info, TCSR) & 0x0f00) | 0xfa) );
7272 usc_DmaCmd( info, DmaCmd_InitTxChannel );
7274 /* wait for DMA controller to fill transmit FIFO */
7276 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
7278 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7281 /**********************************/
7282 /* WAIT FOR TRANSMIT FIFO TO FILL */
7283 /**********************************/
7286 EndTime = jiffies + msecs_to_jiffies(100);
7289 if (time_after(jiffies, EndTime)) {
7294 spin_lock_irqsave(&info->irq_spinlock,flags);
7295 FifoLevel = usc_InReg(info, TICR) >> 8;
7296 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7298 if ( FifoLevel < 16 )
7301 if ( FrameSize < 32 ) {
7302 /* This frame is smaller than the entire transmit FIFO */
7303 /* so wait for the entire frame to be loaded. */
7304 if ( FifoLevel <= (32 - FrameSize) )
7312 /* Enable 16C32 transmitter. */
7314 spin_lock_irqsave(&info->irq_spinlock,flags);
7316 /* Transmit mode Register (TMR), <1..0> = 10, Enable Transmitter */
7317 usc_TCmd( info, TCmd_SendFrame );
7318 usc_OutReg( info, TMR, (unsigned short)((usc_InReg(info, TMR) & 0xfffc) | 0x0002) );
7320 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7323 /******************************/
7324 /* WAIT FOR TRANSMIT COMPLETE */
7325 /******************************/
7328 EndTime = jiffies + msecs_to_jiffies(100);
7330 /* While timer not expired wait for transmit complete */
7332 spin_lock_irqsave(&info->irq_spinlock,flags);
7333 status = usc_InReg( info, TCSR );
7334 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7336 while ( !(status & (BIT6+BIT5+BIT4+BIT2+BIT1)) ) {
7337 if (time_after(jiffies, EndTime)) {
7342 spin_lock_irqsave(&info->irq_spinlock,flags);
7343 status = usc_InReg( info, TCSR );
7344 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7350 /* CHECK FOR TRANSMIT ERRORS */
7351 if ( status & (BIT5 + BIT1) )
7356 /* WAIT FOR RECEIVE COMPLETE */
7359 EndTime = jiffies + msecs_to_jiffies(100);
7361 /* Wait for 16C32 to write receive status to buffer entry. */
7362 status=info->rx_buffer_list[0].status;
7363 while ( status == 0 ) {
7364 if (time_after(jiffies, EndTime)) {
7368 status=info->rx_buffer_list[0].status;
7374 /* CHECK FOR RECEIVE ERRORS */
7375 status = info->rx_buffer_list[0].status;
7377 if ( status & (BIT8 + BIT3 + BIT1) ) {
7378 /* receive error has occurred */
7381 if ( memcmp( info->tx_buffer_list[0].virt_addr ,
7382 info->rx_buffer_list[0].virt_addr, FrameSize ) ){
7388 spin_lock_irqsave(&info->irq_spinlock,flags);
7390 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7392 /* restore current port options */
7393 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
7397 } /* end of mgsl_dma_test() */
7399 /* mgsl_adapter_test()
7401 * Perform the register, IRQ, and DMA tests for the 16C32.
7403 * Arguments: info pointer to device instance data
7404 * Return Value: 0 if success, otherwise -ENODEV
7406 static int mgsl_adapter_test( struct mgsl_struct *info )
7408 if ( debug_level >= DEBUG_LEVEL_INFO )
7409 printk( "%s(%d):Testing device %s\n",
7410 __FILE__,__LINE__,info->device_name );
7412 if ( !mgsl_register_test( info ) ) {
7413 info->init_error = DiagStatus_AddressFailure;
7414 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
7415 __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
7419 if ( !mgsl_irq_test( info ) ) {
7420 info->init_error = DiagStatus_IrqFailure;
7421 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
7422 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
7426 if ( !mgsl_dma_test( info ) ) {
7427 info->init_error = DiagStatus_DmaFailure;
7428 printk( "%s(%d):DMA test failure for device %s DMA=%d\n",
7429 __FILE__,__LINE__,info->device_name, (unsigned short)(info->dma_level) );
7433 if ( debug_level >= DEBUG_LEVEL_INFO )
7434 printk( "%s(%d):device %s passed diagnostics\n",
7435 __FILE__,__LINE__,info->device_name );
7439 } /* end of mgsl_adapter_test() */
7441 /* mgsl_memory_test()
7443 * Test the shared memory on a PCI adapter.
7445 * Arguments: info pointer to device instance data
7446 * Return Value: true if test passed, otherwise false
7448 static bool mgsl_memory_test( struct mgsl_struct *info )
7450 static unsigned long BitPatterns[] =
7451 { 0x0, 0x55555555, 0xaaaaaaaa, 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
7452 unsigned long Patterncount = ARRAY_SIZE(BitPatterns);
7454 unsigned long TestLimit = SHARED_MEM_ADDRESS_SIZE/sizeof(unsigned long);
7455 unsigned long * TestAddr;
7457 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
7460 TestAddr = (unsigned long *)info->memory_base;
7462 /* Test data lines with test pattern at one location. */
7464 for ( i = 0 ; i < Patterncount ; i++ ) {
7465 *TestAddr = BitPatterns[i];
7466 if ( *TestAddr != BitPatterns[i] )
7470 /* Test address lines with incrementing pattern over */
7471 /* entire address range. */
7473 for ( i = 0 ; i < TestLimit ; i++ ) {
7478 TestAddr = (unsigned long *)info->memory_base;
7480 for ( i = 0 ; i < TestLimit ; i++ ) {
7481 if ( *TestAddr != i * 4 )
7486 memset( info->memory_base, 0, SHARED_MEM_ADDRESS_SIZE );
7490 } /* End Of mgsl_memory_test() */
7493 /* mgsl_load_pci_memory()
7495 * Load a large block of data into the PCI shared memory.
7496 * Use this instead of memcpy() or memmove() to move data
7497 * into the PCI shared memory.
7501 * This function prevents the PCI9050 interface chip from hogging
7502 * the adapter local bus, which can starve the 16C32 by preventing
7503 * 16C32 bus master cycles.
7505 * The PCI9050 documentation says that the 9050 will always release
7506 * control of the local bus after completing the current read
7507 * or write operation.
7509 * It appears that as long as the PCI9050 write FIFO is full, the
7510 * PCI9050 treats all of the writes as a single burst transaction
7511 * and will not release the bus. This causes DMA latency problems
7512 * at high speeds when copying large data blocks to the shared
7515 * This function in effect, breaks the a large shared memory write
7516 * into multiple transations by interleaving a shared memory read
7517 * which will flush the write FIFO and 'complete' the write
7518 * transation. This allows any pending DMA request to gain control
7519 * of the local bus in a timely fasion.
7523 * TargetPtr pointer to target address in PCI shared memory
7524 * SourcePtr pointer to source buffer for data
7525 * count count in bytes of data to copy
7527 * Return Value: None
7529 static void mgsl_load_pci_memory( char* TargetPtr, const char* SourcePtr,
7530 unsigned short count )
7532 /* 16 32-bit writes @ 60ns each = 960ns max latency on local bus */
7533 #define PCI_LOAD_INTERVAL 64
7535 unsigned short Intervalcount = count / PCI_LOAD_INTERVAL;
7536 unsigned short Index;
7537 unsigned long Dummy;
7539 for ( Index = 0 ; Index < Intervalcount ; Index++ )
7541 memcpy(TargetPtr, SourcePtr, PCI_LOAD_INTERVAL);
7542 Dummy = *((volatile unsigned long *)TargetPtr);
7543 TargetPtr += PCI_LOAD_INTERVAL;
7544 SourcePtr += PCI_LOAD_INTERVAL;
7547 memcpy( TargetPtr, SourcePtr, count % PCI_LOAD_INTERVAL );
7549 } /* End Of mgsl_load_pci_memory() */
7551 static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit)
7556 printk("%s tx data:\n",info->device_name);
7558 printk("%s rx data:\n",info->device_name);
7566 for(i=0;i<linecount;i++)
7567 printk("%02X ",(unsigned char)data[i]);
7570 for(i=0;i<linecount;i++) {
7571 if (data[i]>=040 && data[i]<=0176)
7572 printk("%c",data[i]);
7581 } /* end of mgsl_trace_block() */
7583 /* mgsl_tx_timeout()
7585 * called when HDLC frame times out
7586 * update stats and do tx completion processing
7588 * Arguments: context pointer to device instance data
7589 * Return Value: None
7591 static void mgsl_tx_timeout(unsigned long context)
7593 struct mgsl_struct *info = (struct mgsl_struct*)context;
7594 unsigned long flags;
7596 if ( debug_level >= DEBUG_LEVEL_INFO )
7597 printk( "%s(%d):mgsl_tx_timeout(%s)\n",
7598 __FILE__,__LINE__,info->device_name);
7599 if(info->tx_active &&
7600 (info->params.mode == MGSL_MODE_HDLC ||
7601 info->params.mode == MGSL_MODE_RAW) ) {
7602 info->icount.txtimeout++;
7604 spin_lock_irqsave(&info->irq_spinlock,flags);
7605 info->tx_active = false;
7606 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
7608 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
7609 usc_loopmode_cancel_transmit( info );
7611 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7613 #if SYNCLINK_GENERIC_HDLC
7615 hdlcdev_tx_done(info);
7618 mgsl_bh_transmit(info);
7620 } /* end of mgsl_tx_timeout() */
7622 /* signal that there are no more frames to send, so that
7623 * line is 'released' by echoing RxD to TxD when current
7624 * transmission is complete (or immediately if no tx in progress).
7626 static int mgsl_loopmode_send_done( struct mgsl_struct * info )
7628 unsigned long flags;
7630 spin_lock_irqsave(&info->irq_spinlock,flags);
7631 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
7632 if (info->tx_active)
7633 info->loopmode_send_done_requested = true;
7635 usc_loopmode_send_done(info);
7637 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7642 /* release the line by echoing RxD to TxD
7643 * upon completion of a transmit frame
7645 static void usc_loopmode_send_done( struct mgsl_struct * info )
7647 info->loopmode_send_done_requested = false;
7648 /* clear CMR:13 to 0 to start echoing RxData to TxData */
7649 info->cmr_value &= ~BIT13;
7650 usc_OutReg(info, CMR, info->cmr_value);
7653 /* abort a transmit in progress while in HDLC LoopMode
7655 static void usc_loopmode_cancel_transmit( struct mgsl_struct * info )
7657 /* reset tx dma channel and purge TxFifo */
7658 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7659 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
7660 usc_loopmode_send_done( info );
7663 /* for HDLC/SDLC LoopMode, setting CMR:13 after the transmitter is enabled
7664 * is an Insert Into Loop action. Upon receipt of a GoAhead sequence (RxAbort)
7665 * we must clear CMR:13 to begin repeating TxData to RxData
7667 static void usc_loopmode_insert_request( struct mgsl_struct * info )
7669 info->loopmode_insert_requested = true;
7671 /* enable RxAbort irq. On next RxAbort, clear CMR:13 to
7672 * begin repeating TxData on RxData (complete insertion)
7674 usc_OutReg( info, RICR,
7675 (usc_InReg( info, RICR ) | RXSTATUS_ABORT_RECEIVED ) );
7677 /* set CMR:13 to insert into loop on next GoAhead (RxAbort) */
7678 info->cmr_value |= BIT13;
7679 usc_OutReg(info, CMR, info->cmr_value);
7682 /* return 1 if station is inserted into the loop, otherwise 0
7684 static int usc_loopmode_active( struct mgsl_struct * info)
7686 return usc_InReg( info, CCSR ) & BIT7 ? 1 : 0 ;
7689 #if SYNCLINK_GENERIC_HDLC
7692 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
7693 * set encoding and frame check sequence (FCS) options
7695 * dev pointer to network device structure
7696 * encoding serial encoding setting
7697 * parity FCS setting
7699 * returns 0 if success, otherwise error code
7701 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
7702 unsigned short parity)
7704 struct mgsl_struct *info = dev_to_port(dev);
7705 unsigned char new_encoding;
7706 unsigned short new_crctype;
7708 /* return error if TTY interface open */
7714 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
7715 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
7716 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
7717 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
7718 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
7719 default: return -EINVAL;
7724 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
7725 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
7726 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
7727 default: return -EINVAL;
7730 info->params.encoding = new_encoding;
7731 info->params.crc_type = new_crctype;
7733 /* if network interface up, reprogram hardware */
7735 mgsl_program_hw(info);
7741 * called by generic HDLC layer to send frame
7743 * skb socket buffer containing HDLC frame
7744 * dev pointer to network device structure
7746 * returns 0 if success, otherwise error code
7748 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
7750 struct mgsl_struct *info = dev_to_port(dev);
7751 struct net_device_stats *stats = hdlc_stats(dev);
7752 unsigned long flags;
7754 if (debug_level >= DEBUG_LEVEL_INFO)
7755 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
7757 /* stop sending until this frame completes */
7758 netif_stop_queue(dev);
7760 /* copy data to device buffers */
7761 info->xmit_cnt = skb->len;
7762 mgsl_load_tx_dma_buffer(info, skb->data, skb->len);
7764 /* update network statistics */
7765 stats->tx_packets++;
7766 stats->tx_bytes += skb->len;
7768 /* done with socket buffer, so free it */
7771 /* save start time for transmit timeout detection */
7772 dev->trans_start = jiffies;
7774 /* start hardware transmitter if necessary */
7775 spin_lock_irqsave(&info->irq_spinlock,flags);
7776 if (!info->tx_active)
7777 usc_start_transmitter(info);
7778 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7784 * called by network layer when interface enabled
7785 * claim resources and initialize hardware
7787 * dev pointer to network device structure
7789 * returns 0 if success, otherwise error code
7791 static int hdlcdev_open(struct net_device *dev)
7793 struct mgsl_struct *info = dev_to_port(dev);
7795 unsigned long flags;
7797 if (debug_level >= DEBUG_LEVEL_INFO)
7798 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
7800 /* generic HDLC layer open processing */
7801 if ((rc = hdlc_open(dev)))
7804 /* arbitrate between network and tty opens */
7805 spin_lock_irqsave(&info->netlock, flags);
7806 if (info->count != 0 || info->netcount != 0) {
7807 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
7808 spin_unlock_irqrestore(&info->netlock, flags);
7812 spin_unlock_irqrestore(&info->netlock, flags);
7814 /* claim resources and init adapter */
7815 if ((rc = startup(info)) != 0) {
7816 spin_lock_irqsave(&info->netlock, flags);
7818 spin_unlock_irqrestore(&info->netlock, flags);
7822 /* assert DTR and RTS, apply hardware settings */
7823 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
7824 mgsl_program_hw(info);
7826 /* enable network layer transmit */
7827 dev->trans_start = jiffies;
7828 netif_start_queue(dev);
7830 /* inform generic HDLC layer of current DCD status */
7831 spin_lock_irqsave(&info->irq_spinlock, flags);
7832 usc_get_serial_signals(info);
7833 spin_unlock_irqrestore(&info->irq_spinlock, flags);
7834 if (info->serial_signals & SerialSignal_DCD)
7835 netif_carrier_on(dev);
7837 netif_carrier_off(dev);
7842 * called by network layer when interface is disabled
7843 * shutdown hardware and release resources
7845 * dev pointer to network device structure
7847 * returns 0 if success, otherwise error code
7849 static int hdlcdev_close(struct net_device *dev)
7851 struct mgsl_struct *info = dev_to_port(dev);
7852 unsigned long flags;
7854 if (debug_level >= DEBUG_LEVEL_INFO)
7855 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
7857 netif_stop_queue(dev);
7859 /* shutdown adapter and release resources */
7864 spin_lock_irqsave(&info->netlock, flags);
7866 spin_unlock_irqrestore(&info->netlock, flags);
7872 * called by network layer to process IOCTL call to network device
7874 * dev pointer to network device structure
7875 * ifr pointer to network interface request structure
7876 * cmd IOCTL command code
7878 * returns 0 if success, otherwise error code
7880 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
7882 const size_t size = sizeof(sync_serial_settings);
7883 sync_serial_settings new_line;
7884 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
7885 struct mgsl_struct *info = dev_to_port(dev);
7888 if (debug_level >= DEBUG_LEVEL_INFO)
7889 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
7891 /* return error if TTY interface open */
7895 if (cmd != SIOCWANDEV)
7896 return hdlc_ioctl(dev, ifr, cmd);
7898 switch(ifr->ifr_settings.type) {
7899 case IF_GET_IFACE: /* return current sync_serial_settings */
7901 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
7902 if (ifr->ifr_settings.size < size) {
7903 ifr->ifr_settings.size = size; /* data size wanted */
7907 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7908 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7909 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7910 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7913 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
7914 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
7915 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
7916 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
7917 default: new_line.clock_type = CLOCK_DEFAULT;
7920 new_line.clock_rate = info->params.clock_speed;
7921 new_line.loopback = info->params.loopback ? 1:0;
7923 if (copy_to_user(line, &new_line, size))
7927 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
7929 if(!capable(CAP_NET_ADMIN))
7931 if (copy_from_user(&new_line, line, size))
7934 switch (new_line.clock_type)
7936 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
7937 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
7938 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
7939 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
7940 case CLOCK_DEFAULT: flags = info->params.flags &
7941 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7942 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7943 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7944 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
7945 default: return -EINVAL;
7948 if (new_line.loopback != 0 && new_line.loopback != 1)
7951 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7952 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7953 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7954 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7955 info->params.flags |= flags;
7957 info->params.loopback = new_line.loopback;
7959 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
7960 info->params.clock_speed = new_line.clock_rate;
7962 info->params.clock_speed = 0;
7964 /* if network interface up, reprogram hardware */
7966 mgsl_program_hw(info);
7970 return hdlc_ioctl(dev, ifr, cmd);
7975 * called by network layer when transmit timeout is detected
7977 * dev pointer to network device structure
7979 static void hdlcdev_tx_timeout(struct net_device *dev)
7981 struct mgsl_struct *info = dev_to_port(dev);
7982 struct net_device_stats *stats = hdlc_stats(dev);
7983 unsigned long flags;
7985 if (debug_level >= DEBUG_LEVEL_INFO)
7986 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
7989 stats->tx_aborted_errors++;
7991 spin_lock_irqsave(&info->irq_spinlock,flags);
7992 usc_stop_transmitter(info);
7993 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7995 netif_wake_queue(dev);
7999 * called by device driver when transmit completes
8000 * reenable network layer transmit if stopped
8002 * info pointer to device instance information
8004 static void hdlcdev_tx_done(struct mgsl_struct *info)
8006 if (netif_queue_stopped(info->netdev))
8007 netif_wake_queue(info->netdev);
8011 * called by device driver when frame received
8012 * pass frame to network layer
8014 * info pointer to device instance information
8015 * buf pointer to buffer contianing frame data
8016 * size count of data bytes in buf
8018 static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size)
8020 struct sk_buff *skb = dev_alloc_skb(size);
8021 struct net_device *dev = info->netdev;
8022 struct net_device_stats *stats = hdlc_stats(dev);
8024 if (debug_level >= DEBUG_LEVEL_INFO)
8025 printk("hdlcdev_rx(%s)\n",dev->name);
8028 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
8029 stats->rx_dropped++;
8033 memcpy(skb_put(skb, size),buf,size);
8035 skb->protocol = hdlc_type_trans(skb, info->netdev);
8037 stats->rx_packets++;
8038 stats->rx_bytes += size;
8042 info->netdev->last_rx = jiffies;
8046 * called by device driver when adding device instance
8047 * do generic HDLC initialization
8049 * info pointer to device instance information
8051 * returns 0 if success, otherwise error code
8053 static int hdlcdev_init(struct mgsl_struct *info)
8056 struct net_device *dev;
8059 /* allocate and initialize network and HDLC layer objects */
8061 if (!(dev = alloc_hdlcdev(info))) {
8062 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
8066 /* for network layer reporting purposes only */
8067 dev->base_addr = info->io_base;
8068 dev->irq = info->irq_level;
8069 dev->dma = info->dma_level;
8071 /* network layer callbacks and settings */
8072 dev->do_ioctl = hdlcdev_ioctl;
8073 dev->open = hdlcdev_open;
8074 dev->stop = hdlcdev_close;
8075 dev->tx_timeout = hdlcdev_tx_timeout;
8076 dev->watchdog_timeo = 10*HZ;
8077 dev->tx_queue_len = 50;
8079 /* generic HDLC layer callbacks and settings */
8080 hdlc = dev_to_hdlc(dev);
8081 hdlc->attach = hdlcdev_attach;
8082 hdlc->xmit = hdlcdev_xmit;
8084 /* register objects with HDLC layer */
8085 if ((rc = register_hdlc_device(dev))) {
8086 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
8096 * called by device driver when removing device instance
8097 * do generic HDLC cleanup
8099 * info pointer to device instance information
8101 static void hdlcdev_exit(struct mgsl_struct *info)
8103 unregister_hdlc_device(info->netdev);
8104 free_netdev(info->netdev);
8105 info->netdev = NULL;
8108 #endif /* CONFIG_HDLC */
8111 static int __devinit synclink_init_one (struct pci_dev *dev,
8112 const struct pci_device_id *ent)
8114 struct mgsl_struct *info;
8116 if (pci_enable_device(dev)) {
8117 printk("error enabling pci device %p\n", dev);
8121 if (!(info = mgsl_allocate_device())) {
8122 printk("can't allocate device instance data.\n");
8126 /* Copy user configuration info to device instance data */
8128 info->io_base = pci_resource_start(dev, 2);
8129 info->irq_level = dev->irq;
8130 info->phys_memory_base = pci_resource_start(dev, 3);
8132 /* Because veremap only works on page boundaries we must map
8133 * a larger area than is actually implemented for the LCR
8134 * memory range. We map a full page starting at the page boundary.
8136 info->phys_lcr_base = pci_resource_start(dev, 0);
8137 info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
8138 info->phys_lcr_base &= ~(PAGE_SIZE-1);
8140 info->bus_type = MGSL_BUS_TYPE_PCI;
8141 info->io_addr_size = 8;
8142 info->irq_flags = IRQF_SHARED;
8144 if (dev->device == 0x0210) {
8145 /* Version 1 PCI9030 based universal PCI adapter */
8146 info->misc_ctrl_value = 0x007c4080;
8147 info->hw_version = 1;
8149 /* Version 0 PCI9050 based 5V PCI adapter
8150 * A PCI9050 bug prevents reading LCR registers if
8151 * LCR base address bit 7 is set. Maintain shadow
8152 * value so we can write to LCR misc control reg.
8154 info->misc_ctrl_value = 0x087e4546;
8155 info->hw_version = 0;
8158 mgsl_add_device(info);
8163 static void __devexit synclink_remove_one (struct pci_dev *dev)