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net: add skb_dst_force() in sock_queue_err_skb()
[linux/fpc-iii.git] / drivers / net / wan / farsync.c
blobe050bd65e0378cbdd6643d893c01a4462a2dea2f
1 /*
2 * FarSync WAN driver for Linux (2.6.x kernel version)
3 *
4 * Actually sync driver for X.21, V.35 and V.24 on FarSync T-series cards
5 *
6 * Copyright (C) 2001-2004 FarSite Communications Ltd.
7 * www.farsite.co.uk
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 *
14 * Author: R.J.Dunlop <bob.dunlop@farsite.co.uk>
15 * Maintainer: Kevin Curtis <kevin.curtis@farsite.co.uk>
16 */
17
18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19
20 #include <linux/module.h>
21 #include <linux/kernel.h>
22 #include <linux/version.h>
23 #include <linux/pci.h>
24 #include <linux/sched.h>
25 #include <linux/slab.h>
26 #include <linux/ioport.h>
27 #include <linux/init.h>
28 #include <linux/if.h>
29 #include <linux/hdlc.h>
30 #include <asm/io.h>
31 #include <asm/uaccess.h>
32
33 #include "farsync.h"
34
35 /*
36 * Module info
37 */
38 MODULE_AUTHOR("R.J.Dunlop <bob.dunlop@farsite.co.uk>");
39 MODULE_DESCRIPTION("FarSync T-Series WAN driver. FarSite Communications Ltd.");
40 MODULE_LICENSE("GPL");
41
42 /* Driver configuration and global parameters
43 * ==========================================
44 */
45
46 /* Number of ports (per card) and cards supported
47 */
48 #define FST_MAX_PORTS 4
49 #define FST_MAX_CARDS 32
50
51 /* Default parameters for the link
52 */
53 #define FST_TX_QUEUE_LEN 100 /* At 8Mbps a longer queue length is
54 * useful */
55 #define FST_TXQ_DEPTH 16 /* This one is for the buffering
56 * of frames on the way down to the card
57 * so that we can keep the card busy
58 * and maximise throughput
59 */
60 #define FST_HIGH_WATER_MARK 12 /* Point at which we flow control
61 * network layer */
62 #define FST_LOW_WATER_MARK 8 /* Point at which we remove flow
63 * control from network layer */
64 #define FST_MAX_MTU 8000 /* Huge but possible */
65 #define FST_DEF_MTU 1500 /* Common sane value */
66
67 #define FST_TX_TIMEOUT (2*HZ)
68
69 #ifdef ARPHRD_RAWHDLC
70 #define ARPHRD_MYTYPE ARPHRD_RAWHDLC /* Raw frames */
71 #else
72 #define ARPHRD_MYTYPE ARPHRD_HDLC /* Cisco-HDLC (keepalives etc) */
73 #endif
74
75 /*
76 * Modules parameters and associated variables
77 */
78 static int fst_txq_low = FST_LOW_WATER_MARK;
79 static int fst_txq_high = FST_HIGH_WATER_MARK;
80 static int fst_max_reads = 7;
81 static int fst_excluded_cards = 0;
82 static int fst_excluded_list[FST_MAX_CARDS];
83
84 module_param(fst_txq_low, int, 0);
85 module_param(fst_txq_high, int, 0);
86 module_param(fst_max_reads, int, 0);
87 module_param(fst_excluded_cards, int, 0);
88 module_param_array(fst_excluded_list, int, NULL, 0);
89
90 /* Card shared memory layout
91 * =========================
92 */
93 #pragma pack(1)
94
95 /* This information is derived in part from the FarSite FarSync Smc.h
96 * file. Unfortunately various name clashes and the non-portability of the
97 * bit field declarations in that file have meant that I have chosen to
98 * recreate the information here.
99 *
100 * The SMC (Shared Memory Configuration) has a version number that is
101 * incremented every time there is a significant change. This number can
102 * be used to check that we have not got out of step with the firmware
103 * contained in the .CDE files.
104 */
105 #define SMC_VERSION 24
106
107 #define FST_MEMSIZE 0x100000 /* Size of card memory (1Mb) */
108
109 #define SMC_BASE 0x00002000L /* Base offset of the shared memory window main
110 * configuration structure */
111 #define BFM_BASE 0x00010000L /* Base offset of the shared memory window DMA
112 * buffers */
113
114 #define LEN_TX_BUFFER 8192 /* Size of packet buffers */
115 #define LEN_RX_BUFFER 8192
116
117 #define LEN_SMALL_TX_BUFFER 256 /* Size of obsolete buffs used for DOS diags */
118 #define LEN_SMALL_RX_BUFFER 256
119
120 #define NUM_TX_BUFFER 2 /* Must be power of 2. Fixed by firmware */
121 #define NUM_RX_BUFFER 8
122
123 /* Interrupt retry time in milliseconds */
124 #define INT_RETRY_TIME 2
125
126 /* The Am186CH/CC processors support a SmartDMA mode using circular pools
127 * of buffer descriptors. The structure is almost identical to that used
128 * in the LANCE Ethernet controllers. Details available as PDF from the
129 * AMD web site: http://www.amd.com/products/epd/processors/\
130 * 2.16bitcont/3.am186cxfa/a21914/21914.pdf
131 */
132 struct txdesc { /* Transmit descriptor */
133 volatile u16 ladr; /* Low order address of packet. This is a
134 * linear address in the Am186 memory space
135 */
136 volatile u8 hadr; /* High order address. Low 4 bits only, high 4
137 * bits must be zero
138 */
139 volatile u8 bits; /* Status and config */
140 volatile u16 bcnt; /* 2s complement of packet size in low 15 bits.
141 * Transmit terminal count interrupt enable in
142 * top bit.
143 */
144 u16 unused; /* Not used in Tx */
145 };
146
147 struct rxdesc { /* Receive descriptor */
148 volatile u16 ladr; /* Low order address of packet */
149 volatile u8 hadr; /* High order address */
150 volatile u8 bits; /* Status and config */
151 volatile u16 bcnt; /* 2s complement of buffer size in low 15 bits.
152 * Receive terminal count interrupt enable in
153 * top bit.
154 */
155 volatile u16 mcnt; /* Message byte count (15 bits) */
156 };
157
158 /* Convert a length into the 15 bit 2's complement */
159 /* #define cnv_bcnt(len) (( ~(len) + 1 ) & 0x7FFF ) */
160 /* Since we need to set the high bit to enable the completion interrupt this
161 * can be made a lot simpler
162 */
163 #define cnv_bcnt(len) (-(len))
164
165 /* Status and config bits for the above */
166 #define DMA_OWN 0x80 /* SmartDMA owns the descriptor */
167 #define TX_STP 0x02 /* Tx: start of packet */
168 #define TX_ENP 0x01 /* Tx: end of packet */
169 #define RX_ERR 0x40 /* Rx: error (OR of next 4 bits) */
170 #define RX_FRAM 0x20 /* Rx: framing error */
171 #define RX_OFLO 0x10 /* Rx: overflow error */
172 #define RX_CRC 0x08 /* Rx: CRC error */
173 #define RX_HBUF 0x04 /* Rx: buffer error */
174 #define RX_STP 0x02 /* Rx: start of packet */
175 #define RX_ENP 0x01 /* Rx: end of packet */
176
177 /* Interrupts from the card are caused by various events which are presented
178 * in a circular buffer as several events may be processed on one physical int
179 */
180 #define MAX_CIRBUFF 32
181
182 struct cirbuff {
183 u8 rdindex; /* read, then increment and wrap */
184 u8 wrindex; /* write, then increment and wrap */
185 u8 evntbuff[MAX_CIRBUFF];
186 };
187
188 /* Interrupt event codes.
189 * Where appropriate the two low order bits indicate the port number
190 */
191 #define CTLA_CHG 0x18 /* Control signal changed */
192 #define CTLB_CHG 0x19
193 #define CTLC_CHG 0x1A
194 #define CTLD_CHG 0x1B
195
196 #define INIT_CPLT 0x20 /* Initialisation complete */
197 #define INIT_FAIL 0x21 /* Initialisation failed */
198
199 #define ABTA_SENT 0x24 /* Abort sent */
200 #define ABTB_SENT 0x25
201 #define ABTC_SENT 0x26
202 #define ABTD_SENT 0x27
203
204 #define TXA_UNDF 0x28 /* Transmission underflow */
205 #define TXB_UNDF 0x29
206 #define TXC_UNDF 0x2A
207 #define TXD_UNDF 0x2B
208
209 #define F56_INT 0x2C
210 #define M32_INT 0x2D
211
212 #define TE1_ALMA 0x30
213
214 /* Port physical configuration. See farsync.h for field values */
215 struct port_cfg {
216 u16 lineInterface; /* Physical interface type */
217 u8 x25op; /* Unused at present */
218 u8 internalClock; /* 1 => internal clock, 0 => external */
219 u8 transparentMode; /* 1 => on, 0 => off */
220 u8 invertClock; /* 0 => normal, 1 => inverted */
221 u8 padBytes[6]; /* Padding */
222 u32 lineSpeed; /* Speed in bps */
223 };
224
225 /* TE1 port physical configuration */
226 struct su_config {
227 u32 dataRate;
228 u8 clocking;
229 u8 framing;
230 u8 structure;
231 u8 interface;
232 u8 coding;
233 u8 lineBuildOut;
234 u8 equalizer;
235 u8 transparentMode;
236 u8 loopMode;
237 u8 range;
238 u8 txBufferMode;
239 u8 rxBufferMode;
240 u8 startingSlot;
241 u8 losThreshold;
242 u8 enableIdleCode;
243 u8 idleCode;
244 u8 spare[44];
245 };
246
247 /* TE1 Status */
248 struct su_status {
249 u32 receiveBufferDelay;
250 u32 framingErrorCount;
251 u32 codeViolationCount;
252 u32 crcErrorCount;
253 u32 lineAttenuation;
254 u8 portStarted;
255 u8 lossOfSignal;
256 u8 receiveRemoteAlarm;
257 u8 alarmIndicationSignal;
258 u8 spare[40];
259 };
260
261 /* Finally sling all the above together into the shared memory structure.
262 * Sorry it's a hodge podge of arrays, structures and unused bits, it's been
263 * evolving under NT for some time so I guess we're stuck with it.
264 * The structure starts at offset SMC_BASE.
265 * See farsync.h for some field values.
266 */
267 struct fst_shared {
268 /* DMA descriptor rings */
269 struct rxdesc rxDescrRing[FST_MAX_PORTS][NUM_RX_BUFFER];
270 struct txdesc txDescrRing[FST_MAX_PORTS][NUM_TX_BUFFER];
271
272 /* Obsolete small buffers */
273 u8 smallRxBuffer[FST_MAX_PORTS][NUM_RX_BUFFER][LEN_SMALL_RX_BUFFER];
274 u8 smallTxBuffer[FST_MAX_PORTS][NUM_TX_BUFFER][LEN_SMALL_TX_BUFFER];
275
276 u8 taskStatus; /* 0x00 => initialising, 0x01 => running,
277 * 0xFF => halted
278 */
279
280 u8 interruptHandshake; /* Set to 0x01 by adapter to signal interrupt,
281 * set to 0xEE by host to acknowledge interrupt
282 */
283
284 u16 smcVersion; /* Must match SMC_VERSION */
285
286 u32 smcFirmwareVersion; /* 0xIIVVRRBB where II = product ID, VV = major
287 * version, RR = revision and BB = build
288 */
289
290 u16 txa_done; /* Obsolete completion flags */
291 u16 rxa_done;
292 u16 txb_done;
293 u16 rxb_done;
294 u16 txc_done;
295 u16 rxc_done;
296 u16 txd_done;
297 u16 rxd_done;
298
299 u16 mailbox[4]; /* Diagnostics mailbox. Not used */
300
301 struct cirbuff interruptEvent; /* interrupt causes */
302
303 u32 v24IpSts[FST_MAX_PORTS]; /* V.24 control input status */
304 u32 v24OpSts[FST_MAX_PORTS]; /* V.24 control output status */
305
306 struct port_cfg portConfig[FST_MAX_PORTS];
307
308 u16 clockStatus[FST_MAX_PORTS]; /* lsb: 0=> present, 1=> absent */
309
310 u16 cableStatus; /* lsb: 0=> present, 1=> absent */
311
312 u16 txDescrIndex[FST_MAX_PORTS]; /* transmit descriptor ring index */
313 u16 rxDescrIndex[FST_MAX_PORTS]; /* receive descriptor ring index */
314
315 u16 portMailbox[FST_MAX_PORTS][2]; /* command, modifier */
316 u16 cardMailbox[4]; /* Not used */
317
318 /* Number of times the card thinks the host has
319 * missed an interrupt by not acknowledging
320 * within 2mS (I guess NT has problems)
321 */
322 u32 interruptRetryCount;
323
324 /* Driver private data used as an ID. We'll not
325 * use this as I'd rather keep such things
326 * in main memory rather than on the PCI bus
327 */
328 u32 portHandle[FST_MAX_PORTS];
329
330 /* Count of Tx underflows for stats */
331 u32 transmitBufferUnderflow[FST_MAX_PORTS];
332
333 /* Debounced V.24 control input status */
334 u32 v24DebouncedSts[FST_MAX_PORTS];
335
336 /* Adapter debounce timers. Don't touch */
337 u32 ctsTimer[FST_MAX_PORTS];
338 u32 ctsTimerRun[FST_MAX_PORTS];
339 u32 dcdTimer[FST_MAX_PORTS];
340 u32 dcdTimerRun[FST_MAX_PORTS];
341
342 u32 numberOfPorts; /* Number of ports detected at startup */
343
344 u16 _reserved[64];
345
346 u16 cardMode; /* Bit-mask to enable features:
347 * Bit 0: 1 enables LED identify mode
348 */
349
350 u16 portScheduleOffset;
351
352 struct su_config suConfig; /* TE1 Bits */
353 struct su_status suStatus;
354
355 u32 endOfSmcSignature; /* endOfSmcSignature MUST be the last member of
356 * the structure and marks the end of shared
357 * memory. Adapter code initializes it as
358 * END_SIG.
359 */
360 };
361
362 /* endOfSmcSignature value */
363 #define END_SIG 0x12345678
364
365 /* Mailbox values. (portMailbox) */
366 #define NOP 0 /* No operation */
367 #define ACK 1 /* Positive acknowledgement to PC driver */
368 #define NAK 2 /* Negative acknowledgement to PC driver */
369 #define STARTPORT 3 /* Start an HDLC port */
370 #define STOPPORT 4 /* Stop an HDLC port */
371 #define ABORTTX 5 /* Abort the transmitter for a port */
372 #define SETV24O 6 /* Set V24 outputs */
373
374 /* PLX Chip Register Offsets */
375 #define CNTRL_9052 0x50 /* Control Register */
376 #define CNTRL_9054 0x6c /* Control Register */
377
378 #define INTCSR_9052 0x4c /* Interrupt control/status register */
379 #define INTCSR_9054 0x68 /* Interrupt control/status register */
380
381 /* 9054 DMA Registers */
382 /*
383 * Note that we will be using DMA Channel 0 for copying rx data
384 * and Channel 1 for copying tx data
385 */
386 #define DMAMODE0 0x80
387 #define DMAPADR0 0x84
388 #define DMALADR0 0x88
389 #define DMASIZ0 0x8c
390 #define DMADPR0 0x90
391 #define DMAMODE1 0x94
392 #define DMAPADR1 0x98
393 #define DMALADR1 0x9c
394 #define DMASIZ1 0xa0
395 #define DMADPR1 0xa4
396 #define DMACSR0 0xa8
397 #define DMACSR1 0xa9
398 #define DMAARB 0xac
399 #define DMATHR 0xb0
400 #define DMADAC0 0xb4
401 #define DMADAC1 0xb8
402 #define DMAMARBR 0xac
403
404 #define FST_MIN_DMA_LEN 64
405 #define FST_RX_DMA_INT 0x01
406 #define FST_TX_DMA_INT 0x02
407 #define FST_CARD_INT 0x04
408
409 /* Larger buffers are positioned in memory at offset BFM_BASE */
410 struct buf_window {
411 u8 txBuffer[FST_MAX_PORTS][NUM_TX_BUFFER][LEN_TX_BUFFER];
412 u8 rxBuffer[FST_MAX_PORTS][NUM_RX_BUFFER][LEN_RX_BUFFER];
413 };
414
415 /* Calculate offset of a buffer object within the shared memory window */
416 #define BUF_OFFSET(X) (BFM_BASE + offsetof(struct buf_window, X))
417
418 #pragma pack()
419
420 /* Device driver private information
421 * =================================
422 */
423 /* Per port (line or channel) information
424 */
425 struct fst_port_info {
426 struct net_device *dev; /* Device struct - must be first */
427 struct fst_card_info *card; /* Card we're associated with */
428 int index; /* Port index on the card */
429 int hwif; /* Line hardware (lineInterface copy) */
430 int run; /* Port is running */
431 int mode; /* Normal or FarSync raw */
432 int rxpos; /* Next Rx buffer to use */
433 int txpos; /* Next Tx buffer to use */
434 int txipos; /* Next Tx buffer to check for free */
435 int start; /* Indication of start/stop to network */
436 /*
437 * A sixteen entry transmit queue
438 */
439 int txqs; /* index to get next buffer to tx */
440 int txqe; /* index to queue next packet */
441 struct sk_buff *txq[FST_TXQ_DEPTH]; /* The queue */
442 int rxqdepth;
443 };
444
445 /* Per card information
446 */
447 struct fst_card_info {
448 char __iomem *mem; /* Card memory mapped to kernel space */
449 char __iomem *ctlmem; /* Control memory for PCI cards */
450 unsigned int phys_mem; /* Physical memory window address */
451 unsigned int phys_ctlmem; /* Physical control memory address */
452 unsigned int irq; /* Interrupt request line number */
453 unsigned int nports; /* Number of serial ports */
454 unsigned int type; /* Type index of card */
455 unsigned int state; /* State of card */
456 spinlock_t card_lock; /* Lock for SMP access */
457 unsigned short pci_conf; /* PCI card config in I/O space */
458 /* Per port info */
459 struct fst_port_info ports[FST_MAX_PORTS];
460 struct pci_dev *device; /* Information about the pci device */
461 int card_no; /* Inst of the card on the system */
462 int family; /* TxP or TxU */
463 int dmarx_in_progress;
464 int dmatx_in_progress;
465 unsigned long int_count;
466 unsigned long int_time_ave;
467 void *rx_dma_handle_host;
468 dma_addr_t rx_dma_handle_card;
469 void *tx_dma_handle_host;
470 dma_addr_t tx_dma_handle_card;
471 struct sk_buff *dma_skb_rx;
472 struct fst_port_info *dma_port_rx;
473 struct fst_port_info *dma_port_tx;
474 int dma_len_rx;
475 int dma_len_tx;
476 int dma_txpos;
477 int dma_rxpos;
478 };
479
480 /* Convert an HDLC device pointer into a port info pointer and similar */
481 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
482 #define port_to_dev(P) ((P)->dev)
483
484
485 /*
486 * Shared memory window access macros
487 *
488 * We have a nice memory based structure above, which could be directly
489 * mapped on i386 but might not work on other architectures unless we use
490 * the readb,w,l and writeb,w,l macros. Unfortunately these macros take
491 * physical offsets so we have to convert. The only saving grace is that
492 * this should all collapse back to a simple indirection eventually.
493 */
494 #define WIN_OFFSET(X) ((long)&(((struct fst_shared *)SMC_BASE)->X))
495
496 #define FST_RDB(C,E) readb ((C)->mem + WIN_OFFSET(E))
497 #define FST_RDW(C,E) readw ((C)->mem + WIN_OFFSET(E))
498 #define FST_RDL(C,E) readl ((C)->mem + WIN_OFFSET(E))
499
500 #define FST_WRB(C,E,B) writeb ((B), (C)->mem + WIN_OFFSET(E))
501 #define FST_WRW(C,E,W) writew ((W), (C)->mem + WIN_OFFSET(E))
502 #define FST_WRL(C,E,L) writel ((L), (C)->mem + WIN_OFFSET(E))
503
504 /*
505 * Debug support
506 */
507 #if FST_DEBUG
508
509 static int fst_debug_mask = { FST_DEBUG };
510
511 /* Most common debug activity is to print something if the corresponding bit
512 * is set in the debug mask. Note: this uses a non-ANSI extension in GCC to
513 * support variable numbers of macro parameters. The inverted if prevents us
514 * eating someone else's else clause.
515 */
516 #define dbg(F, fmt, args...) \
517 do { \
518 if (fst_debug_mask & (F)) \
519 printk(KERN_DEBUG pr_fmt(fmt), ##args); \
520 } while (0)
521 #else
522 #define dbg(F, fmt, args...) \
523 do { \
524 if (0) \
525 printk(KERN_DEBUG pr_fmt(fmt), ##args); \
526 } while (0)
527 #endif
528
529 /*
530 * PCI ID lookup table
531 */
532 static DEFINE_PCI_DEVICE_TABLE(fst_pci_dev_id) = {
533 {PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_T2P, PCI_ANY_ID,
534 PCI_ANY_ID, 0, 0, FST_TYPE_T2P},
535
536 {PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_T4P, PCI_ANY_ID,
537 PCI_ANY_ID, 0, 0, FST_TYPE_T4P},
538
539 {PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_T1U, PCI_ANY_ID,
540 PCI_ANY_ID, 0, 0, FST_TYPE_T1U},
541
542 {PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_T2U, PCI_ANY_ID,
543 PCI_ANY_ID, 0, 0, FST_TYPE_T2U},
544
545 {PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_T4U, PCI_ANY_ID,
546 PCI_ANY_ID, 0, 0, FST_TYPE_T4U},
547
548 {PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_TE1, PCI_ANY_ID,
549 PCI_ANY_ID, 0, 0, FST_TYPE_TE1},
550
551 {PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_TE1C, PCI_ANY_ID,
552 PCI_ANY_ID, 0, 0, FST_TYPE_TE1},
553 {0,} /* End */
554 };
555
556 MODULE_DEVICE_TABLE(pci, fst_pci_dev_id);
557
558 /*
559 * Device Driver Work Queues
560 *
561 * So that we don't spend too much time processing events in the
562 * Interrupt Service routine, we will declare a work queue per Card
563 * and make the ISR schedule a task in the queue for later execution.
564 * In the 2.4 Kernel we used to use the immediate queue for BH's
565 * Now that they are gone, tasklets seem to be much better than work
566 * queues.
567 */
568
569 static void do_bottom_half_tx(struct fst_card_info *card);
570 static void do_bottom_half_rx(struct fst_card_info *card);
571 static void fst_process_tx_work_q(unsigned long work_q);
572 static void fst_process_int_work_q(unsigned long work_q);
573
574 static DECLARE_TASKLET(fst_tx_task, fst_process_tx_work_q, 0);
575 static DECLARE_TASKLET(fst_int_task, fst_process_int_work_q, 0);
576
577 static struct fst_card_info *fst_card_array[FST_MAX_CARDS];
578 static spinlock_t fst_work_q_lock;
579 static u64 fst_work_txq;
580 static u64 fst_work_intq;
581
582 static void
583 fst_q_work_item(u64 * queue, int card_index)
584 {
585 unsigned long flags;
586 u64 mask;
587
588 /*
589 * Grab the queue exclusively
590 */
591 spin_lock_irqsave(&fst_work_q_lock, flags);
592
593 /*
594 * Making an entry in the queue is simply a matter of setting
595 * a bit for the card indicating that there is work to do in the
596 * bottom half for the card. Note the limitation of 64 cards.
597 * That ought to be enough
598 */
599 mask = 1 << card_index;
600 *queue |= mask;
601 spin_unlock_irqrestore(&fst_work_q_lock, flags);
602 }
603
604 static void
605 fst_process_tx_work_q(unsigned long /*void **/work_q)
606 {
607 unsigned long flags;
608 u64 work_txq;
609 int i;
610
611 /*
612 * Grab the queue exclusively
613 */
614 dbg(DBG_TX, "fst_process_tx_work_q\n");
615 spin_lock_irqsave(&fst_work_q_lock, flags);
616 work_txq = fst_work_txq;
617 fst_work_txq = 0;
618 spin_unlock_irqrestore(&fst_work_q_lock, flags);
619
620 /*
621 * Call the bottom half for each card with work waiting
622 */
623 for (i = 0; i < FST_MAX_CARDS; i++) {
624 if (work_txq & 0x01) {
625 if (fst_card_array[i] != NULL) {
626 dbg(DBG_TX, "Calling tx bh for card %d\n", i);
627 do_bottom_half_tx(fst_card_array[i]);
628 }
629 }
630 work_txq = work_txq >> 1;
631 }
632 }
633
634 static void
635 fst_process_int_work_q(unsigned long /*void **/work_q)
636 {
637 unsigned long flags;
638 u64 work_intq;
639 int i;
640
641 /*
642 * Grab the queue exclusively
643 */
644 dbg(DBG_INTR, "fst_process_int_work_q\n");
645 spin_lock_irqsave(&fst_work_q_lock, flags);
646 work_intq = fst_work_intq;
647 fst_work_intq = 0;
648 spin_unlock_irqrestore(&fst_work_q_lock, flags);
649
650 /*
651 * Call the bottom half for each card with work waiting
652 */
653 for (i = 0; i < FST_MAX_CARDS; i++) {
654 if (work_intq & 0x01) {
655 if (fst_card_array[i] != NULL) {
656 dbg(DBG_INTR,
657 "Calling rx & tx bh for card %d\n", i);
658 do_bottom_half_rx(fst_card_array[i]);
659 do_bottom_half_tx(fst_card_array[i]);
660 }
661 }
662 work_intq = work_intq >> 1;
663 }
664 }
665
666 /* Card control functions
667 * ======================
668 */
669 /* Place the processor in reset state
670 *
671 * Used to be a simple write to card control space but a glitch in the latest
672 * AMD Am186CH processor means that we now have to do it by asserting and de-
673 * asserting the PLX chip PCI Adapter Software Reset. Bit 30 in CNTRL register
674 * at offset 9052_CNTRL. Note the updates for the TXU.
675 */
676 static inline void
677 fst_cpureset(struct fst_card_info *card)
678 {
679 unsigned char interrupt_line_register;
680 unsigned long j = jiffies + 1;
681 unsigned int regval;
682
683 if (card->family == FST_FAMILY_TXU) {
684 if (pci_read_config_byte
685 (card->device, PCI_INTERRUPT_LINE, &interrupt_line_register)) {
686 dbg(DBG_ASS,
687 "Error in reading interrupt line register\n");
688 }
689 /*
690 * Assert PLX software reset and Am186 hardware reset
691 * and then deassert the PLX software reset but 186 still in reset
692 */
693 outw(0x440f, card->pci_conf + CNTRL_9054 + 2);
694 outw(0x040f, card->pci_conf + CNTRL_9054 + 2);
695 /*
696 * We are delaying here to allow the 9054 to reset itself
697 */
698 j = jiffies + 1;
699 while (jiffies < j)
700 /* Do nothing */ ;
701 outw(0x240f, card->pci_conf + CNTRL_9054 + 2);
702 /*
703 * We are delaying here to allow the 9054 to reload its eeprom
704 */
705 j = jiffies + 1;
706 while (jiffies < j)
707 /* Do nothing */ ;
708 outw(0x040f, card->pci_conf + CNTRL_9054 + 2);
709
710 if (pci_write_config_byte
711 (card->device, PCI_INTERRUPT_LINE, interrupt_line_register)) {
712 dbg(DBG_ASS,
713 "Error in writing interrupt line register\n");
714 }
715
716 } else {
717 regval = inl(card->pci_conf + CNTRL_9052);
718
719 outl(regval | 0x40000000, card->pci_conf + CNTRL_9052);
720 outl(regval & ~0x40000000, card->pci_conf + CNTRL_9052);
721 }
722 }
723
724 /* Release the processor from reset
725 */
726 static inline void
727 fst_cpurelease(struct fst_card_info *card)
728 {
729 if (card->family == FST_FAMILY_TXU) {
730 /*
731 * Force posted writes to complete
732 */
733 (void) readb(card->mem);
734
735 /*
736 * Release LRESET DO = 1
737 * Then release Local Hold, DO = 1
738 */
739 outw(0x040e, card->pci_conf + CNTRL_9054 + 2);
740 outw(0x040f, card->pci_conf + CNTRL_9054 + 2);
741 } else {
742 (void) readb(card->ctlmem);
743 }
744 }
745
746 /* Clear the cards interrupt flag
747 */
748 static inline void
749 fst_clear_intr(struct fst_card_info *card)
750 {
751 if (card->family == FST_FAMILY_TXU) {
752 (void) readb(card->ctlmem);
753 } else {
754 /* Poke the appropriate PLX chip register (same as enabling interrupts)
755 */
756 outw(0x0543, card->pci_conf + INTCSR_9052);
757 }
758 }
759
760 /* Enable card interrupts
761 */
762 static inline void
763 fst_enable_intr(struct fst_card_info *card)
764 {
765 if (card->family == FST_FAMILY_TXU) {
766 outl(0x0f0c0900, card->pci_conf + INTCSR_9054);
767 } else {
768 outw(0x0543, card->pci_conf + INTCSR_9052);
769 }
770 }
771
772 /* Disable card interrupts
773 */
774 static inline void
775 fst_disable_intr(struct fst_card_info *card)
776 {
777 if (card->family == FST_FAMILY_TXU) {
778 outl(0x00000000, card->pci_conf + INTCSR_9054);
779 } else {
780 outw(0x0000, card->pci_conf + INTCSR_9052);
781 }
782 }
783
784 /* Process the result of trying to pass a received frame up the stack
785 */
786 static void
787 fst_process_rx_status(int rx_status, char *name)
788 {
789 switch (rx_status) {
790 case NET_RX_SUCCESS:
791 {
792 /*
793 * Nothing to do here
794 */
795 break;
796 }
797 case NET_RX_DROP:
798 {
799 dbg(DBG_ASS, "%s: Received packet dropped\n", name);
800 break;
801 }
802 }
803 }
804
805 /* Initilaise DMA for PLX 9054
806 */
807 static inline void
808 fst_init_dma(struct fst_card_info *card)
809 {
810 /*
811 * This is only required for the PLX 9054
812 */
813 if (card->family == FST_FAMILY_TXU) {
814 pci_set_master(card->device);
815 outl(0x00020441, card->pci_conf + DMAMODE0);
816 outl(0x00020441, card->pci_conf + DMAMODE1);
817 outl(0x0, card->pci_conf + DMATHR);
818 }
819 }
820
821 /* Tx dma complete interrupt
822 */
823 static void
824 fst_tx_dma_complete(struct fst_card_info *card, struct fst_port_info *port,
825 int len, int txpos)
826 {
827 struct net_device *dev = port_to_dev(port);
828
829 /*
830 * Everything is now set, just tell the card to go
831 */
832 dbg(DBG_TX, "fst_tx_dma_complete\n");
833 FST_WRB(card, txDescrRing[port->index][txpos].bits,
834 DMA_OWN | TX_STP | TX_ENP);
835 dev->stats.tx_packets++;
836 dev->stats.tx_bytes += len;
837 dev->trans_start = jiffies;
838 }
839
840 /*
841 * Mark it for our own raw sockets interface
842 */
843 static __be16 farsync_type_trans(struct sk_buff *skb, struct net_device *dev)
844 {
845 skb->dev = dev;
846 skb_reset_mac_header(skb);
847 skb->pkt_type = PACKET_HOST;
848 return htons(ETH_P_CUST);
849 }
850
851 /* Rx dma complete interrupt
852 */
853 static void
854 fst_rx_dma_complete(struct fst_card_info *card, struct fst_port_info *port,
855 int len, struct sk_buff *skb, int rxp)
856 {
857 struct net_device *dev = port_to_dev(port);
858 int pi;
859 int rx_status;
860
861 dbg(DBG_TX, "fst_rx_dma_complete\n");
862 pi = port->index;
863 memcpy(skb_put(skb, len), card->rx_dma_handle_host, len);
864
865 /* Reset buffer descriptor */
866 FST_WRB(card, rxDescrRing[pi][rxp].bits, DMA_OWN);
867
868 /* Update stats */
869 dev->stats.rx_packets++;
870 dev->stats.rx_bytes += len;
871
872 /* Push upstream */
873 dbg(DBG_RX, "Pushing the frame up the stack\n");
874 if (port->mode == FST_RAW)
875 skb->protocol = farsync_type_trans(skb, dev);
876 else
877 skb->protocol = hdlc_type_trans(skb, dev);
878 rx_status = netif_rx(skb);
879 fst_process_rx_status(rx_status, port_to_dev(port)->name);
880 if (rx_status == NET_RX_DROP)
881 dev->stats.rx_dropped++;
882 }
883
884 /*
885 * Receive a frame through the DMA
886 */
887 static inline void
888 fst_rx_dma(struct fst_card_info *card, dma_addr_t skb,
889 dma_addr_t mem, int len)
890 {
891 /*
892 * This routine will setup the DMA and start it
893 */
894
895 dbg(DBG_RX, "In fst_rx_dma %lx %lx %d\n",
896 (unsigned long) skb, (unsigned long) mem, len);
897 if (card->dmarx_in_progress) {
898 dbg(DBG_ASS, "In fst_rx_dma while dma in progress\n");
899 }
900
901 outl(skb, card->pci_conf + DMAPADR0); /* Copy to here */
902 outl(mem, card->pci_conf + DMALADR0); /* from here */
903 outl(len, card->pci_conf + DMASIZ0); /* for this length */
904 outl(0x00000000c, card->pci_conf + DMADPR0); /* In this direction */
905
906 /*
907 * We use the dmarx_in_progress flag to flag the channel as busy
908 */
909 card->dmarx_in_progress = 1;
910 outb(0x03, card->pci_conf + DMACSR0); /* Start the transfer */
911 }
912
913 /*
914 * Send a frame through the DMA
915 */
916 static inline void
917 fst_tx_dma(struct fst_card_info *card, unsigned char *skb,
918 unsigned char *mem, int len)
919 {
920 /*
921 * This routine will setup the DMA and start it.
922 */
923
924 dbg(DBG_TX, "In fst_tx_dma %p %p %d\n", skb, mem, len);
925 if (card->dmatx_in_progress) {
926 dbg(DBG_ASS, "In fst_tx_dma while dma in progress\n");
927 }
928
929 outl((unsigned long) skb, card->pci_conf + DMAPADR1); /* Copy from here */
930 outl((unsigned long) mem, card->pci_conf + DMALADR1); /* to here */
931 outl(len, card->pci_conf + DMASIZ1); /* for this length */
932 outl(0x000000004, card->pci_conf + DMADPR1); /* In this direction */
933
934 /*
935 * We use the dmatx_in_progress to flag the channel as busy
936 */
937 card->dmatx_in_progress = 1;
938 outb(0x03, card->pci_conf + DMACSR1); /* Start the transfer */
939 }
940
941 /* Issue a Mailbox command for a port.
942 * Note we issue them on a fire and forget basis, not expecting to see an
943 * error and not waiting for completion.
944 */
945 static void
946 fst_issue_cmd(struct fst_port_info *port, unsigned short cmd)
947 {
948 struct fst_card_info *card;
949 unsigned short mbval;
950 unsigned long flags;
951 int safety;
952
953 card = port->card;
954 spin_lock_irqsave(&card->card_lock, flags);
955 mbval = FST_RDW(card, portMailbox[port->index][0]);
956
957 safety = 0;
958 /* Wait for any previous command to complete */
959 while (mbval > NAK) {
960 spin_unlock_irqrestore(&card->card_lock, flags);
961 schedule_timeout_uninterruptible(1);
962 spin_lock_irqsave(&card->card_lock, flags);
963
964 if (++safety > 2000) {
965 pr_err("Mailbox safety timeout\n");
966 break;
967 }
968
969 mbval = FST_RDW(card, portMailbox[port->index][0]);
970 }
971 if (safety > 0) {
972 dbg(DBG_CMD, "Mailbox clear after %d jiffies\n", safety);
973 }
974 if (mbval == NAK) {
975 dbg(DBG_CMD, "issue_cmd: previous command was NAK'd\n");
976 }
977
978 FST_WRW(card, portMailbox[port->index][0], cmd);
979
980 if (cmd == ABORTTX || cmd == STARTPORT) {
981 port->txpos = 0;
982 port->txipos = 0;
983 port->start = 0;
984 }
985
986 spin_unlock_irqrestore(&card->card_lock, flags);
987 }
988
989 /* Port output signals control
990 */
991 static inline void
992 fst_op_raise(struct fst_port_info *port, unsigned int outputs)
993 {
994 outputs |= FST_RDL(port->card, v24OpSts[port->index]);
995 FST_WRL(port->card, v24OpSts[port->index], outputs);
996
997 if (port->run)
998 fst_issue_cmd(port, SETV24O);
999 }
1000
1001 static inline void
1002 fst_op_lower(struct fst_port_info *port, unsigned int outputs)
1003 {
1004 outputs = ~outputs & FST_RDL(port->card, v24OpSts[port->index]);
1005 FST_WRL(port->card, v24OpSts[port->index], outputs);
1006
1007 if (port->run)
1008 fst_issue_cmd(port, SETV24O);
1009 }
1010
1011 /*
1012 * Setup port Rx buffers
1013 */
1014 static void
1015 fst_rx_config(struct fst_port_info *port)
1016 {
1017 int i;
1018 int pi;
1019 unsigned int offset;
1020 unsigned long flags;
1021 struct fst_card_info *card;
1022
1023 pi = port->index;
1024 card = port->card;
1025 spin_lock_irqsave(&card->card_lock, flags);
1026 for (i = 0; i < NUM_RX_BUFFER; i++) {
1027 offset = BUF_OFFSET(rxBuffer[pi][i][0]);
1028
1029 FST_WRW(card, rxDescrRing[pi][i].ladr, (u16) offset);
1030 FST_WRB(card, rxDescrRing[pi][i].hadr, (u8) (offset >> 16));
1031 FST_WRW(card, rxDescrRing[pi][i].bcnt, cnv_bcnt(LEN_RX_BUFFER));
1032 FST_WRW(card, rxDescrRing[pi][i].mcnt, LEN_RX_BUFFER);
1033 FST_WRB(card, rxDescrRing[pi][i].bits, DMA_OWN);
1034 }
1035 port->rxpos = 0;
1036 spin_unlock_irqrestore(&card->card_lock, flags);
1037 }
1038
1039 /*
1040 * Setup port Tx buffers
1041 */
1042 static void
1043 fst_tx_config(struct fst_port_info *port)
1044 {
1045 int i;
1046 int pi;
1047 unsigned int offset;
1048 unsigned long flags;
1049 struct fst_card_info *card;
1050
1051 pi = port->index;
1052 card = port->card;
1053 spin_lock_irqsave(&card->card_lock, flags);
1054 for (i = 0; i < NUM_TX_BUFFER; i++) {
1055 offset = BUF_OFFSET(txBuffer[pi][i][0]);
1056
1057 FST_WRW(card, txDescrRing[pi][i].ladr, (u16) offset);
1058 FST_WRB(card, txDescrRing[pi][i].hadr, (u8) (offset >> 16));
1059 FST_WRW(card, txDescrRing[pi][i].bcnt, 0);
1060 FST_WRB(card, txDescrRing[pi][i].bits, 0);
1061 }
1062 port->txpos = 0;
1063 port->txipos = 0;
1064 port->start = 0;
1065 spin_unlock_irqrestore(&card->card_lock, flags);
1066 }
1067
1068 /* TE1 Alarm change interrupt event
1069 */
1070 static void
1071 fst_intr_te1_alarm(struct fst_card_info *card, struct fst_port_info *port)
1072 {
1073 u8 los;
1074 u8 rra;
1075 u8 ais;
1076
1077 los = FST_RDB(card, suStatus.lossOfSignal);
1078 rra = FST_RDB(card, suStatus.receiveRemoteAlarm);
1079 ais = FST_RDB(card, suStatus.alarmIndicationSignal);
1080
1081 if (los) {
1082 /*
1083 * Lost the link
1084 */
1085 if (netif_carrier_ok(port_to_dev(port))) {
1086 dbg(DBG_INTR, "Net carrier off\n");
1087 netif_carrier_off(port_to_dev(port));
1088 }
1089 } else {
1090 /*
1091 * Link available
1092 */
1093 if (!netif_carrier_ok(port_to_dev(port))) {
1094 dbg(DBG_INTR, "Net carrier on\n");
1095 netif_carrier_on(port_to_dev(port));
1096 }
1097 }
1098
1099 if (los)
1100 dbg(DBG_INTR, "Assert LOS Alarm\n");
1101 else
1102 dbg(DBG_INTR, "De-assert LOS Alarm\n");
1103 if (rra)
1104 dbg(DBG_INTR, "Assert RRA Alarm\n");
1105 else
1106 dbg(DBG_INTR, "De-assert RRA Alarm\n");
1107
1108 if (ais)
1109 dbg(DBG_INTR, "Assert AIS Alarm\n");
1110 else
1111 dbg(DBG_INTR, "De-assert AIS Alarm\n");
1112 }
1113
1114 /* Control signal change interrupt event
1115 */
1116 static void
1117 fst_intr_ctlchg(struct fst_card_info *card, struct fst_port_info *port)
1118 {
1119 int signals;
1120
1121 signals = FST_RDL(card, v24DebouncedSts[port->index]);
1122
1123 if (signals & (((port->hwif == X21) || (port->hwif == X21D))
1124 ? IPSTS_INDICATE : IPSTS_DCD)) {
1125 if (!netif_carrier_ok(port_to_dev(port))) {
1126 dbg(DBG_INTR, "DCD active\n");
1127 netif_carrier_on(port_to_dev(port));
1128 }
1129 } else {
1130 if (netif_carrier_ok(port_to_dev(port))) {
1131 dbg(DBG_INTR, "DCD lost\n");
1132 netif_carrier_off(port_to_dev(port));
1133 }
1134 }
1135 }
1136
1137 /* Log Rx Errors
1138 */
1139 static void
1140 fst_log_rx_error(struct fst_card_info *card, struct fst_port_info *port,
1141 unsigned char dmabits, int rxp, unsigned short len)
1142 {
1143 struct net_device *dev = port_to_dev(port);
1144
1145 /*
1146 * Increment the appropriate error counter
1147 */
1148 dev->stats.rx_errors++;
1149 if (dmabits & RX_OFLO) {
1150 dev->stats.rx_fifo_errors++;
1151 dbg(DBG_ASS, "Rx fifo error on card %d port %d buffer %d\n",
1152 card->card_no, port->index, rxp);
1153 }
1154 if (dmabits & RX_CRC) {
1155 dev->stats.rx_crc_errors++;
1156 dbg(DBG_ASS, "Rx crc error on card %d port %d\n",
1157 card->card_no, port->index);
1158 }
1159 if (dmabits & RX_FRAM) {
1160 dev->stats.rx_frame_errors++;
1161 dbg(DBG_ASS, "Rx frame error on card %d port %d\n",
1162 card->card_no, port->index);
1163 }
1164 if (dmabits == (RX_STP | RX_ENP)) {
1165 dev->stats.rx_length_errors++;
1166 dbg(DBG_ASS, "Rx length error (%d) on card %d port %d\n",
1167 len, card->card_no, port->index);
1168 }
1169 }
1170
1171 /* Rx Error Recovery
1172 */
1173 static void
1174 fst_recover_rx_error(struct fst_card_info *card, struct fst_port_info *port,
1175 unsigned char dmabits, int rxp, unsigned short len)
1176 {
1177 int i;
1178 int pi;
1179
1180 pi = port->index;
1181 /*
1182 * Discard buffer descriptors until we see the start of the
1183 * next frame. Note that for long frames this could be in
1184 * a subsequent interrupt.
1185 */
1186 i = 0;
1187 while ((dmabits & (DMA_OWN | RX_STP)) == 0) {
1188 FST_WRB(card, rxDescrRing[pi][rxp].bits, DMA_OWN);
1189 rxp = (rxp+1) % NUM_RX_BUFFER;
1190 if (++i > NUM_RX_BUFFER) {
1191 dbg(DBG_ASS, "intr_rx: Discarding more bufs"
1192 " than we have\n");
1193 break;
1194 }
1195 dmabits = FST_RDB(card, rxDescrRing[pi][rxp].bits);
1196 dbg(DBG_ASS, "DMA Bits of next buffer was %x\n", dmabits);
1197 }
1198 dbg(DBG_ASS, "There were %d subsequent buffers in error\n", i);
1199
1200 /* Discard the terminal buffer */
1201 if (!(dmabits & DMA_OWN)) {
1202 FST_WRB(card, rxDescrRing[pi][rxp].bits, DMA_OWN);
1203 rxp = (rxp+1) % NUM_RX_BUFFER;
1204 }
1205 port->rxpos = rxp;
1206 return;
1207
1208 }
1209
1210 /* Rx complete interrupt
1211 */
1212 static void
1213 fst_intr_rx(struct fst_card_info *card, struct fst_port_info *port)
1214 {
1215 unsigned char dmabits;
1216 int pi;
1217 int rxp;
1218 int rx_status;
1219 unsigned short len;
1220 struct sk_buff *skb;
1221 struct net_device *dev = port_to_dev(port);
1222
1223 /* Check we have a buffer to process */
1224 pi = port->index;
1225 rxp = port->rxpos;
1226 dmabits = FST_RDB(card, rxDescrRing[pi][rxp].bits);
1227 if (dmabits & DMA_OWN) {
1228 dbg(DBG_RX | DBG_INTR, "intr_rx: No buffer port %d pos %d\n",
1229 pi, rxp);
1230 return;
1231 }
1232 if (card->dmarx_in_progress) {
1233 return;
1234 }
1235
1236 /* Get buffer length */
1237 len = FST_RDW(card, rxDescrRing[pi][rxp].mcnt);
1238 /* Discard the CRC */
1239 len -= 2;
1240 if (len == 0) {
1241 /*
1242 * This seems to happen on the TE1 interface sometimes
1243 * so throw the frame away and log the event.
1244 */
1245 pr_err("Frame received with 0 length. Card %d Port %d\n",
1246 card->card_no, port->index);
1247 /* Return descriptor to card */
1248 FST_WRB(card, rxDescrRing[pi][rxp].bits, DMA_OWN);
1249
1250 rxp = (rxp+1) % NUM_RX_BUFFER;
1251 port->rxpos = rxp;
1252 return;
1253 }
1254
1255 /* Check buffer length and for other errors. We insist on one packet
1256 * in one buffer. This simplifies things greatly and since we've
1257 * allocated 8K it shouldn't be a real world limitation
1258 */
1259 dbg(DBG_RX, "intr_rx: %d,%d: flags %x len %d\n", pi, rxp, dmabits, len);
1260 if (dmabits != (RX_STP | RX_ENP) || len > LEN_RX_BUFFER - 2) {
1261 fst_log_rx_error(card, port, dmabits, rxp, len);
1262 fst_recover_rx_error(card, port, dmabits, rxp, len);
1263 return;
1264 }
1265
1266 /* Allocate SKB */
1267 if ((skb = dev_alloc_skb(len)) == NULL) {
1268 dbg(DBG_RX, "intr_rx: can't allocate buffer\n");
1269
1270 dev->stats.rx_dropped++;
1271
1272 /* Return descriptor to card */
1273 FST_WRB(card, rxDescrRing[pi][rxp].bits, DMA_OWN);
1274
1275 rxp = (rxp+1) % NUM_RX_BUFFER;
1276 port->rxpos = rxp;
1277 return;
1278 }
1279
1280 /*
1281 * We know the length we need to receive, len.
1282 * It's not worth using the DMA for reads of less than
1283 * FST_MIN_DMA_LEN
1284 */
1285
1286 if ((len < FST_MIN_DMA_LEN) || (card->family == FST_FAMILY_TXP)) {
1287 memcpy_fromio(skb_put(skb, len),
1288 card->mem + BUF_OFFSET(rxBuffer[pi][rxp][0]),
1289 len);
1290
1291 /* Reset buffer descriptor */
1292 FST_WRB(card, rxDescrRing[pi][rxp].bits, DMA_OWN);
1293
1294 /* Update stats */
1295 dev->stats.rx_packets++;
1296 dev->stats.rx_bytes += len;
1297
1298 /* Push upstream */
1299 dbg(DBG_RX, "Pushing frame up the stack\n");
1300 if (port->mode == FST_RAW)
1301 skb->protocol = farsync_type_trans(skb, dev);
1302 else
1303 skb->protocol = hdlc_type_trans(skb, dev);
1304 rx_status = netif_rx(skb);
1305 fst_process_rx_status(rx_status, port_to_dev(port)->name);
1306 if (rx_status == NET_RX_DROP)
1307 dev->stats.rx_dropped++;
1308 } else {
1309 card->dma_skb_rx = skb;
1310 card->dma_port_rx = port;
1311 card->dma_len_rx = len;
1312 card->dma_rxpos = rxp;
1313 fst_rx_dma(card, card->rx_dma_handle_card,
1314 BUF_OFFSET(rxBuffer[pi][rxp][0]), len);
1315 }
1316 if (rxp != port->rxpos) {
1317 dbg(DBG_ASS, "About to increment rxpos by more than 1\n");
1318 dbg(DBG_ASS, "rxp = %d rxpos = %d\n", rxp, port->rxpos);
1319 }
1320 rxp = (rxp+1) % NUM_RX_BUFFER;
1321 port->rxpos = rxp;
1322 }
1323
1324 /*
1325 * The bottom halfs to the ISR
1326 *
1327 */
1328
1329 static void
1330 do_bottom_half_tx(struct fst_card_info *card)
1331 {
1332 struct fst_port_info *port;
1333 int pi;
1334 int txq_length;
1335 struct sk_buff *skb;
1336 unsigned long flags;
1337 struct net_device *dev;
1338
1339 /*
1340 * Find a free buffer for the transmit
1341 * Step through each port on this card
1342 */
1343
1344 dbg(DBG_TX, "do_bottom_half_tx\n");
1345 for (pi = 0, port = card->ports; pi < card->nports; pi++, port++) {
1346 if (!port->run)
1347 continue;
1348
1349 dev = port_to_dev(port);
1350 while (!(FST_RDB(card, txDescrRing[pi][port->txpos].bits) &
1351 DMA_OWN) &&
1352 !(card->dmatx_in_progress)) {
1353 /*
1354 * There doesn't seem to be a txdone event per-se
1355 * We seem to have to deduce it, by checking the DMA_OWN
1356 * bit on the next buffer we think we can use
1357 */
1358 spin_lock_irqsave(&card->card_lock, flags);
1359 if ((txq_length = port->txqe - port->txqs) < 0) {
1360 /*
1361 * This is the case where one has wrapped and the
1362 * maths gives us a negative number
1363 */
1364 txq_length = txq_length + FST_TXQ_DEPTH;
1365 }
1366 spin_unlock_irqrestore(&card->card_lock, flags);
1367 if (txq_length > 0) {
1368 /*
1369 * There is something to send
1370 */
1371 spin_lock_irqsave(&card->card_lock, flags);
1372 skb = port->txq[port->txqs];
1373 port->txqs++;
1374 if (port->txqs == FST_TXQ_DEPTH) {
1375 port->txqs = 0;
1376 }
1377 spin_unlock_irqrestore(&card->card_lock, flags);
1378 /*
1379 * copy the data and set the required indicators on the
1380 * card.
1381 */
1382 FST_WRW(card, txDescrRing[pi][port->txpos].bcnt,
1383 cnv_bcnt(skb->len));
1384 if ((skb->len < FST_MIN_DMA_LEN) ||
1385 (card->family == FST_FAMILY_TXP)) {
1386 /* Enqueue the packet with normal io */
1387 memcpy_toio(card->mem +
1388 BUF_OFFSET(txBuffer[pi]
1389 [port->
1390 txpos][0]),
1391 skb->data, skb->len);
1392 FST_WRB(card,
1393 txDescrRing[pi][port->txpos].
1394 bits,
1395 DMA_OWN | TX_STP | TX_ENP);
1396 dev->stats.tx_packets++;
1397 dev->stats.tx_bytes += skb->len;
1398 dev->trans_start = jiffies;
1399 } else {
1400 /* Or do it through dma */
1401 memcpy(card->tx_dma_handle_host,
1402 skb->data, skb->len);
1403 card->dma_port_tx = port;
1404 card->dma_len_tx = skb->len;
1405 card->dma_txpos = port->txpos;
1406 fst_tx_dma(card,
1407 (char *) card->
1408 tx_dma_handle_card,
1409 (char *)
1410 BUF_OFFSET(txBuffer[pi]
1411 [port->txpos][0]),
1412 skb->len);
1413 }
1414 if (++port->txpos >= NUM_TX_BUFFER)
1415 port->txpos = 0;
1416 /*
1417 * If we have flow control on, can we now release it?
1418 */
1419 if (port->start) {
1420 if (txq_length < fst_txq_low) {
1421 netif_wake_queue(port_to_dev
1422 (port));
1423 port->start = 0;
1424 }
1425 }
1426 dev_kfree_skb(skb);
1427 } else {
1428 /*
1429 * Nothing to send so break out of the while loop
1430 */
1431 break;
1432 }
1433 }
1434 }
1435 }
1436
1437 static void
1438 do_bottom_half_rx(struct fst_card_info *card)
1439 {
1440 struct fst_port_info *port;
1441 int pi;
1442 int rx_count = 0;
1443
1444 /* Check for rx completions on all ports on this card */
1445 dbg(DBG_RX, "do_bottom_half_rx\n");
1446 for (pi = 0, port = card->ports; pi < card->nports; pi++, port++) {
1447 if (!port->run)
1448 continue;
1449
1450 while (!(FST_RDB(card, rxDescrRing[pi][port->rxpos].bits)
1451 & DMA_OWN) && !(card->dmarx_in_progress)) {
1452 if (rx_count > fst_max_reads) {
1453 /*
1454 * Don't spend forever in receive processing
1455 * Schedule another event
1456 */
1457 fst_q_work_item(&fst_work_intq, card->card_no);
1458 tasklet_schedule(&fst_int_task);
1459 break; /* Leave the loop */
1460 }
1461 fst_intr_rx(card, port);
1462 rx_count++;
1463 }
1464 }
1465 }
1466
1467 /*
1468 * The interrupt service routine
1469 * Dev_id is our fst_card_info pointer
1470 */
1471 static irqreturn_t
1472 fst_intr(int dummy, void *dev_id)
1473 {
1474 struct fst_card_info *card = dev_id;
1475 struct fst_port_info *port;
1476 int rdidx; /* Event buffer indices */
1477 int wridx;
1478 int event; /* Actual event for processing */
1479 unsigned int dma_intcsr = 0;
1480 unsigned int do_card_interrupt;
1481 unsigned int int_retry_count;
1482
1483 /*
1484 * Check to see if the interrupt was for this card
1485 * return if not
1486 * Note that the call to clear the interrupt is important
1487 */
1488 dbg(DBG_INTR, "intr: %d %p\n", card->irq, card);
1489 if (card->state != FST_RUNNING) {
1490 pr_err("Interrupt received for card %d in a non running state (%d)\n",
1491 card->card_no, card->state);
1492
1493 /*
1494 * It is possible to really be running, i.e. we have re-loaded
1495 * a running card
1496 * Clear and reprime the interrupt source
1497 */
1498 fst_clear_intr(card);
1499 return IRQ_HANDLED;
1500 }
1501
1502 /* Clear and reprime the interrupt source */
1503 fst_clear_intr(card);
1504
1505 /*
1506 * Is the interrupt for this card (handshake == 1)
1507 */
1508 do_card_interrupt = 0;
1509 if (FST_RDB(card, interruptHandshake) == 1) {
1510 do_card_interrupt += FST_CARD_INT;
1511 /* Set the software acknowledge */
1512 FST_WRB(card, interruptHandshake, 0xEE);
1513 }
1514 if (card->family == FST_FAMILY_TXU) {
1515 /*
1516 * Is it a DMA Interrupt
1517 */
1518 dma_intcsr = inl(card->pci_conf + INTCSR_9054);
1519 if (dma_intcsr & 0x00200000) {
1520 /*
1521 * DMA Channel 0 (Rx transfer complete)
1522 */
1523 dbg(DBG_RX, "DMA Rx xfer complete\n");
1524 outb(0x8, card->pci_conf + DMACSR0);
1525 fst_rx_dma_complete(card, card->dma_port_rx,
1526 card->dma_len_rx, card->dma_skb_rx,
1527 card->dma_rxpos);
1528 card->dmarx_in_progress = 0;
1529 do_card_interrupt += FST_RX_DMA_INT;
1530 }
1531 if (dma_intcsr & 0x00400000) {
1532 /*
1533 * DMA Channel 1 (Tx transfer complete)
1534 */
1535 dbg(DBG_TX, "DMA Tx xfer complete\n");
1536 outb(0x8, card->pci_conf + DMACSR1);
1537 fst_tx_dma_complete(card, card->dma_port_tx,
1538 card->dma_len_tx, card->dma_txpos);
1539 card->dmatx_in_progress = 0;
1540 do_card_interrupt += FST_TX_DMA_INT;
1541 }
1542 }
1543
1544 /*
1545 * Have we been missing Interrupts
1546 */
1547 int_retry_count = FST_RDL(card, interruptRetryCount);
1548 if (int_retry_count) {
1549 dbg(DBG_ASS, "Card %d int_retry_count is %d\n",
1550 card->card_no, int_retry_count);
1551 FST_WRL(card, interruptRetryCount, 0);
1552 }
1553
1554 if (!do_card_interrupt) {
1555 return IRQ_HANDLED;
1556 }
1557
1558 /* Scehdule the bottom half of the ISR */
1559 fst_q_work_item(&fst_work_intq, card->card_no);
1560 tasklet_schedule(&fst_int_task);
1561
1562 /* Drain the event queue */
1563 rdidx = FST_RDB(card, interruptEvent.rdindex) & 0x1f;
1564 wridx = FST_RDB(card, interruptEvent.wrindex) & 0x1f;
1565 while (rdidx != wridx) {
1566 event = FST_RDB(card, interruptEvent.evntbuff[rdidx]);
1567 port = &card->ports[event & 0x03];
1568
1569 dbg(DBG_INTR, "Processing Interrupt event: %x\n", event);
1570
1571 switch (event) {
1572 case TE1_ALMA:
1573 dbg(DBG_INTR, "TE1 Alarm intr\n");
1574 if (port->run)
1575 fst_intr_te1_alarm(card, port);
1576 break;
1577
1578 case CTLA_CHG:
1579 case CTLB_CHG:
1580 case CTLC_CHG:
1581 case CTLD_CHG:
1582 if (port->run)
1583 fst_intr_ctlchg(card, port);
1584 break;
1585
1586 case ABTA_SENT:
1587 case ABTB_SENT:
1588 case ABTC_SENT:
1589 case ABTD_SENT:
1590 dbg(DBG_TX, "Abort complete port %d\n", port->index);
1591 break;
1592
1593 case TXA_UNDF:
1594 case TXB_UNDF:
1595 case TXC_UNDF:
1596 case TXD_UNDF:
1597 /* Difficult to see how we'd get this given that we
1598 * always load up the entire packet for DMA.
1599 */
1600 dbg(DBG_TX, "Tx underflow port %d\n", port->index);
1601 port_to_dev(port)->stats.tx_errors++;
1602 port_to_dev(port)->stats.tx_fifo_errors++;
1603 dbg(DBG_ASS, "Tx underflow on card %d port %d\n",
1604 card->card_no, port->index);
1605 break;
1606
1607 case INIT_CPLT:
1608 dbg(DBG_INIT, "Card init OK intr\n");
1609 break;
1610
1611 case INIT_FAIL:
1612 dbg(DBG_INIT, "Card init FAILED intr\n");
1613 card->state = FST_IFAILED;
1614 break;
1615
1616 default:
1617 pr_err("intr: unknown card event %d. ignored\n", event);
1618 break;
1619 }
1620
1621 /* Bump and wrap the index */
1622 if (++rdidx >= MAX_CIRBUFF)
1623 rdidx = 0;
1624 }
1625 FST_WRB(card, interruptEvent.rdindex, rdidx);
1626 return IRQ_HANDLED;
1627 }
1628
1629 /* Check that the shared memory configuration is one that we can handle
1630 * and that some basic parameters are correct
1631 */
1632 static void
1633 check_started_ok(struct fst_card_info *card)
1634 {
1635 int i;
1636
1637 /* Check structure version and end marker */
1638 if (FST_RDW(card, smcVersion) != SMC_VERSION) {
1639 pr_err("Bad shared memory version %d expected %d\n",
1640 FST_RDW(card, smcVersion), SMC_VERSION);
1641 card->state = FST_BADVERSION;
1642 return;
1643 }
1644 if (FST_RDL(card, endOfSmcSignature) != END_SIG) {
1645 pr_err("Missing shared memory signature\n");
1646 card->state = FST_BADVERSION;
1647 return;
1648 }
1649 /* Firmware status flag, 0x00 = initialising, 0x01 = OK, 0xFF = fail */
1650 if ((i = FST_RDB(card, taskStatus)) == 0x01) {
1651 card->state = FST_RUNNING;
1652 } else if (i == 0xFF) {
1653 pr_err("Firmware initialisation failed. Card halted\n");
1654 card->state = FST_HALTED;
1655 return;
1656 } else if (i != 0x00) {
1657 pr_err("Unknown firmware status 0x%x\n", i);
1658 card->state = FST_HALTED;
1659 return;
1660 }
1661
1662 /* Finally check the number of ports reported by firmware against the
1663 * number we assumed at card detection. Should never happen with
1664 * existing firmware etc so we just report it for the moment.
1665 */
1666 if (FST_RDL(card, numberOfPorts) != card->nports) {
1667 pr_warning("Port count mismatch on card %d. "
1668 "Firmware thinks %d we say %d\n",
1669 card->card_no,
1670 FST_RDL(card, numberOfPorts), card->nports);
1671 }
1672 }
1673
1674 static int
1675 set_conf_from_info(struct fst_card_info *card, struct fst_port_info *port,
1676 struct fstioc_info *info)
1677 {
1678 int err;
1679 unsigned char my_framing;
1680
1681 /* Set things according to the user set valid flags
1682 * Several of the old options have been invalidated/replaced by the
1683 * generic hdlc package.
1684 */
1685 err = 0;
1686 if (info->valid & FSTVAL_PROTO) {
1687 if (info->proto == FST_RAW)
1688 port->mode = FST_RAW;
1689 else
1690 port->mode = FST_GEN_HDLC;
1691 }
1692
1693 if (info->valid & FSTVAL_CABLE)
1694 err = -EINVAL;
1695
1696 if (info->valid & FSTVAL_SPEED)
1697 err = -EINVAL;
1698
1699 if (info->valid & FSTVAL_PHASE)
1700 FST_WRB(card, portConfig[port->index].invertClock,
1701 info->invertClock);
1702 if (info->valid & FSTVAL_MODE)
1703 FST_WRW(card, cardMode, info->cardMode);
1704 if (info->valid & FSTVAL_TE1) {
1705 FST_WRL(card, suConfig.dataRate, info->lineSpeed);
1706 FST_WRB(card, suConfig.clocking, info->clockSource);
1707 my_framing = FRAMING_E1;
1708 if (info->framing == E1)
1709 my_framing = FRAMING_E1;
1710 if (info->framing == T1)
1711 my_framing = FRAMING_T1;
1712 if (info->framing == J1)
1713 my_framing = FRAMING_J1;
1714 FST_WRB(card, suConfig.framing, my_framing);
1715 FST_WRB(card, suConfig.structure, info->structure);
1716 FST_WRB(card, suConfig.interface, info->interface);
1717 FST_WRB(card, suConfig.coding, info->coding);
1718 FST_WRB(card, suConfig.lineBuildOut, info->lineBuildOut);
1719 FST_WRB(card, suConfig.equalizer, info->equalizer);
1720 FST_WRB(card, suConfig.transparentMode, info->transparentMode);
1721 FST_WRB(card, suConfig.loopMode, info->loopMode);
1722 FST_WRB(card, suConfig.range, info->range);
1723 FST_WRB(card, suConfig.txBufferMode, info->txBufferMode);
1724 FST_WRB(card, suConfig.rxBufferMode, info->rxBufferMode);
1725 FST_WRB(card, suConfig.startingSlot, info->startingSlot);
1726 FST_WRB(card, suConfig.losThreshold, info->losThreshold);
1727 if (info->idleCode)
1728 FST_WRB(card, suConfig.enableIdleCode, 1);
1729 else
1730 FST_WRB(card, suConfig.enableIdleCode, 0);
1731 FST_WRB(card, suConfig.idleCode, info->idleCode);
1732 #if FST_DEBUG
1733 if (info->valid & FSTVAL_TE1) {
1734 printk("Setting TE1 data\n");
1735 printk("Line Speed = %d\n", info->lineSpeed);
1736 printk("Start slot = %d\n", info->startingSlot);
1737 printk("Clock source = %d\n", info->clockSource);
1738 printk("Framing = %d\n", my_framing);
1739 printk("Structure = %d\n", info->structure);
1740 printk("interface = %d\n", info->interface);
1741 printk("Coding = %d\n", info->coding);
1742 printk("Line build out = %d\n", info->lineBuildOut);
1743 printk("Equaliser = %d\n", info->equalizer);
1744 printk("Transparent mode = %d\n",
1745 info->transparentMode);
1746 printk("Loop mode = %d\n", info->loopMode);
1747 printk("Range = %d\n", info->range);
1748 printk("Tx Buffer mode = %d\n", info->txBufferMode);
1749 printk("Rx Buffer mode = %d\n", info->rxBufferMode);
1750 printk("LOS Threshold = %d\n", info->losThreshold);
1751 printk("Idle Code = %d\n", info->idleCode);
1752 }
1753 #endif
1754 }
1755 #if FST_DEBUG
1756 if (info->valid & FSTVAL_DEBUG) {
1757 fst_debug_mask = info->debug;
1758 }
1759 #endif
1760
1761 return err;
1762 }
1763
1764 static void
1765 gather_conf_info(struct fst_card_info *card, struct fst_port_info *port,
1766 struct fstioc_info *info)
1767 {
1768 int i;
1769
1770 memset(info, 0, sizeof (struct fstioc_info));
1771
1772 i = port->index;
1773 info->kernelVersion = LINUX_VERSION_CODE;
1774 info->nports = card->nports;
1775 info->type = card->type;
1776 info->state = card->state;
1777 info->proto = FST_GEN_HDLC;
1778 info->index = i;
1779 #if FST_DEBUG
1780 info->debug = fst_debug_mask;
1781 #endif
1782
1783 /* Only mark information as valid if card is running.
1784 * Copy the data anyway in case it is useful for diagnostics
1785 */
1786 info->valid = ((card->state == FST_RUNNING) ? FSTVAL_ALL : FSTVAL_CARD)
1787 #if FST_DEBUG
1788 | FSTVAL_DEBUG
1789 #endif
1790 ;
1791
1792 info->lineInterface = FST_RDW(card, portConfig[i].lineInterface);
1793 info->internalClock = FST_RDB(card, portConfig[i].internalClock);
1794 info->lineSpeed = FST_RDL(card, portConfig[i].lineSpeed);
1795 info->invertClock = FST_RDB(card, portConfig[i].invertClock);
1796 info->v24IpSts = FST_RDL(card, v24IpSts[i]);
1797 info->v24OpSts = FST_RDL(card, v24OpSts[i]);
1798 info->clockStatus = FST_RDW(card, clockStatus[i]);
1799 info->cableStatus = FST_RDW(card, cableStatus);
1800 info->cardMode = FST_RDW(card, cardMode);
1801 info->smcFirmwareVersion = FST_RDL(card, smcFirmwareVersion);
1802
1803 /*
1804 * The T2U can report cable presence for both A or B
1805 * in bits 0 and 1 of cableStatus. See which port we are and
1806 * do the mapping.
1807 */
1808 if (card->family == FST_FAMILY_TXU) {
1809 if (port->index == 0) {
1810 /*
1811 * Port A
1812 */
1813 info->cableStatus = info->cableStatus & 1;
1814 } else {
1815 /*
1816 * Port B
1817 */
1818 info->cableStatus = info->cableStatus >> 1;
1819 info->cableStatus = info->cableStatus & 1;
1820 }
1821 }
1822 /*
1823 * Some additional bits if we are TE1
1824 */
1825 if (card->type == FST_TYPE_TE1) {
1826 info->lineSpeed = FST_RDL(card, suConfig.dataRate);
1827 info->clockSource = FST_RDB(card, suConfig.clocking);
1828 info->framing = FST_RDB(card, suConfig.framing);
1829 info->structure = FST_RDB(card, suConfig.structure);
1830 info->interface = FST_RDB(card, suConfig.interface);
1831 info->coding = FST_RDB(card, suConfig.coding);
1832 info->lineBuildOut = FST_RDB(card, suConfig.lineBuildOut);
1833 info->equalizer = FST_RDB(card, suConfig.equalizer);
1834 info->loopMode = FST_RDB(card, suConfig.loopMode);
1835 info->range = FST_RDB(card, suConfig.range);
1836 info->txBufferMode = FST_RDB(card, suConfig.txBufferMode);
1837 info->rxBufferMode = FST_RDB(card, suConfig.rxBufferMode);
1838 info->startingSlot = FST_RDB(card, suConfig.startingSlot);
1839 info->losThreshold = FST_RDB(card, suConfig.losThreshold);
1840 if (FST_RDB(card, suConfig.enableIdleCode))
1841 info->idleCode = FST_RDB(card, suConfig.idleCode);
1842 else
1843 info->idleCode = 0;
1844 info->receiveBufferDelay =
1845 FST_RDL(card, suStatus.receiveBufferDelay);
1846 info->framingErrorCount =
1847 FST_RDL(card, suStatus.framingErrorCount);
1848 info->codeViolationCount =
1849 FST_RDL(card, suStatus.codeViolationCount);
1850 info->crcErrorCount = FST_RDL(card, suStatus.crcErrorCount);
1851 info->lineAttenuation = FST_RDL(card, suStatus.lineAttenuation);
1852 info->lossOfSignal = FST_RDB(card, suStatus.lossOfSignal);
1853 info->receiveRemoteAlarm =
1854 FST_RDB(card, suStatus.receiveRemoteAlarm);
1855 info->alarmIndicationSignal =
1856 FST_RDB(card, suStatus.alarmIndicationSignal);
1857 }
1858 }
1859
1860 static int
1861 fst_set_iface(struct fst_card_info *card, struct fst_port_info *port,
1862 struct ifreq *ifr)
1863 {
1864 sync_serial_settings sync;
1865 int i;
1866
1867 if (ifr->ifr_settings.size != sizeof (sync)) {
1868 return -ENOMEM;
1869 }
1870
1871 if (copy_from_user
1872 (&sync, ifr->ifr_settings.ifs_ifsu.sync, sizeof (sync))) {
1873 return -EFAULT;
1874 }
1875
1876 if (sync.loopback)
1877 return -EINVAL;
1878
1879 i = port->index;
1880
1881 switch (ifr->ifr_settings.type) {
1882 case IF_IFACE_V35:
1883 FST_WRW(card, portConfig[i].lineInterface, V35);
1884 port->hwif = V35;
1885 break;
1886
1887 case IF_IFACE_V24:
1888 FST_WRW(card, portConfig[i].lineInterface, V24);
1889 port->hwif = V24;
1890 break;
1891
1892 case IF_IFACE_X21:
1893 FST_WRW(card, portConfig[i].lineInterface, X21);
1894 port->hwif = X21;
1895 break;
1896
1897 case IF_IFACE_X21D:
1898 FST_WRW(card, portConfig[i].lineInterface, X21D);
1899 port->hwif = X21D;
1900 break;
1901
1902 case IF_IFACE_T1:
1903 FST_WRW(card, portConfig[i].lineInterface, T1);
1904 port->hwif = T1;
1905 break;
1906
1907 case IF_IFACE_E1:
1908 FST_WRW(card, portConfig[i].lineInterface, E1);
1909 port->hwif = E1;
1910 break;
1911
1912 case IF_IFACE_SYNC_SERIAL:
1913 break;
1914
1915 default:
1916 return -EINVAL;
1917 }
1918
1919 switch (sync.clock_type) {
1920 case CLOCK_EXT:
1921 FST_WRB(card, portConfig[i].internalClock, EXTCLK);
1922 break;
1923
1924 case CLOCK_INT:
1925 FST_WRB(card, portConfig[i].internalClock, INTCLK);
1926 break;
1927
1928 default:
1929 return -EINVAL;
1930 }
1931 FST_WRL(card, portConfig[i].lineSpeed, sync.clock_rate);
1932 return 0;
1933 }
1934
1935 static int
1936 fst_get_iface(struct fst_card_info *card, struct fst_port_info *port,
1937 struct ifreq *ifr)
1938 {
1939 sync_serial_settings sync;
1940 int i;
1941
1942 /* First check what line type is set, we'll default to reporting X.21
1943 * if nothing is set as IF_IFACE_SYNC_SERIAL implies it can't be
1944 * changed
1945 */
1946 switch (port->hwif) {
1947 case E1:
1948 ifr->ifr_settings.type = IF_IFACE_E1;
1949 break;
1950 case T1:
1951 ifr->ifr_settings.type = IF_IFACE_T1;
1952 break;
1953 case V35:
1954 ifr->ifr_settings.type = IF_IFACE_V35;
1955 break;
1956 case V24:
1957 ifr->ifr_settings.type = IF_IFACE_V24;
1958 break;
1959 case X21D:
1960 ifr->ifr_settings.type = IF_IFACE_X21D;
1961 break;
1962 case X21:
1963 default:
1964 ifr->ifr_settings.type = IF_IFACE_X21;
1965 break;
1966 }
1967 if (ifr->ifr_settings.size == 0) {
1968 return 0; /* only type requested */
1969 }
1970 if (ifr->ifr_settings.size < sizeof (sync)) {
1971 return -ENOMEM;
1972 }
1973
1974 i = port->index;
1975 sync.clock_rate = FST_RDL(card, portConfig[i].lineSpeed);
1976 /* Lucky card and linux use same encoding here */
1977 sync.clock_type = FST_RDB(card, portConfig[i].internalClock) ==
1978 INTCLK ? CLOCK_INT : CLOCK_EXT;
1979 sync.loopback = 0;
1980
1981 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.sync, &sync, sizeof (sync))) {
1982 return -EFAULT;
1983 }
1984
1985 ifr->ifr_settings.size = sizeof (sync);
1986 return 0;
1987 }
1988
1989 static int
1990 fst_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1991 {
1992 struct fst_card_info *card;
1993 struct fst_port_info *port;
1994 struct fstioc_write wrthdr;
1995 struct fstioc_info info;
1996 unsigned long flags;
1997 void *buf;
1998
1999 dbg(DBG_IOCTL, "ioctl: %x, %p\n", cmd, ifr->ifr_data);
2000
2001 port = dev_to_port(dev);
2002 card = port->card;
2003
2004 if (!capable(CAP_NET_ADMIN))
2005 return -EPERM;
2006
2007 switch (cmd) {
2008 case FSTCPURESET:
2009 fst_cpureset(card);
2010 card->state = FST_RESET;
2011 return 0;
2012
2013 case FSTCPURELEASE:
2014 fst_cpurelease(card);
2015 card->state = FST_STARTING;
2016 return 0;
2017
2018 case FSTWRITE: /* Code write (download) */
2019
2020 /* First copy in the header with the length and offset of data
2021 * to write
2022 */
2023 if (ifr->ifr_data == NULL) {
2024 return -EINVAL;
2025 }
2026 if (copy_from_user(&wrthdr, ifr->ifr_data,
2027 sizeof (struct fstioc_write))) {
2028 return -EFAULT;
2029 }
2030
2031 /* Sanity check the parameters. We don't support partial writes
2032 * when going over the top
2033 */
2034 if (wrthdr.size > FST_MEMSIZE || wrthdr.offset > FST_MEMSIZE ||
2035 wrthdr.size + wrthdr.offset > FST_MEMSIZE) {
2036 return -ENXIO;
2037 }
2038
2039 /* Now copy the data to the card. */
2040
2041 buf = memdup_user(ifr->ifr_data + sizeof(struct fstioc_write),
2042 wrthdr.size);
2043 if (IS_ERR(buf))
2044 return PTR_ERR(buf);
2045
2046 memcpy_toio(card->mem + wrthdr.offset, buf, wrthdr.size);
2047 kfree(buf);
2048
2049 /* Writes to the memory of a card in the reset state constitute
2050 * a download
2051 */
2052 if (card->state == FST_RESET) {
2053 card->state = FST_DOWNLOAD;
2054 }
2055 return 0;
2056
2057 case FSTGETCONF:
2058
2059 /* If card has just been started check the shared memory config
2060 * version and marker
2061 */
2062 if (card->state == FST_STARTING) {
2063 check_started_ok(card);
2064
2065 /* If everything checked out enable card interrupts */
2066 if (card->state == FST_RUNNING) {
2067 spin_lock_irqsave(&card->card_lock, flags);
2068 fst_enable_intr(card);
2069 FST_WRB(card, interruptHandshake, 0xEE);
2070 spin_unlock_irqrestore(&card->card_lock, flags);
2071 }
2072 }
2073
2074 if (ifr->ifr_data == NULL) {
2075 return -EINVAL;
2076 }
2077
2078 gather_conf_info(card, port, &info);
2079
2080 if (copy_to_user(ifr->ifr_data, &info, sizeof (info))) {
2081 return -EFAULT;
2082 }
2083 return 0;
2084
2085 case FSTSETCONF:
2086
2087 /*
2088 * Most of the settings have been moved to the generic ioctls
2089 * this just covers debug and board ident now
2090 */
2091
2092 if (card->state != FST_RUNNING) {
2093 pr_err("Attempt to configure card %d in non-running state (%d)\n",
2094 card->card_no, card->state);
2095 return -EIO;
2096 }
2097 if (copy_from_user(&info, ifr->ifr_data, sizeof (info))) {
2098 return -EFAULT;
2099 }
2100
2101 return set_conf_from_info(card, port, &info);
2102
2103 case SIOCWANDEV:
2104 switch (ifr->ifr_settings.type) {
2105 case IF_GET_IFACE:
2106 return fst_get_iface(card, port, ifr);
2107
2108 case IF_IFACE_SYNC_SERIAL:
2109 case IF_IFACE_V35:
2110 case IF_IFACE_V24:
2111 case IF_IFACE_X21:
2112 case IF_IFACE_X21D:
2113 case IF_IFACE_T1:
2114 case IF_IFACE_E1:
2115 return fst_set_iface(card, port, ifr);
2116
2117 case IF_PROTO_RAW:
2118 port->mode = FST_RAW;
2119 return 0;
2120
2121 case IF_GET_PROTO:
2122 if (port->mode == FST_RAW) {
2123 ifr->ifr_settings.type = IF_PROTO_RAW;
2124 return 0;
2125 }
2126 return hdlc_ioctl(dev, ifr, cmd);
2127
2128 default:
2129 port->mode = FST_GEN_HDLC;
2130 dbg(DBG_IOCTL, "Passing this type to hdlc %x\n",
2131 ifr->ifr_settings.type);
2132 return hdlc_ioctl(dev, ifr, cmd);
2133 }
2134
2135 default:
2136 /* Not one of ours. Pass through to HDLC package */
2137 return hdlc_ioctl(dev, ifr, cmd);
2138 }
2139 }
2140
2141 static void
2142 fst_openport(struct fst_port_info *port)
2143 {
2144 int signals;
2145 int txq_length;
2146
2147 /* Only init things if card is actually running. This allows open to
2148 * succeed for downloads etc.
2149 */
2150 if (port->card->state == FST_RUNNING) {
2151 if (port->run) {
2152 dbg(DBG_OPEN, "open: found port already running\n");
2153
2154 fst_issue_cmd(port, STOPPORT);
2155 port->run = 0;
2156 }
2157
2158 fst_rx_config(port);
2159 fst_tx_config(port);
2160 fst_op_raise(port, OPSTS_RTS | OPSTS_DTR);
2161
2162 fst_issue_cmd(port, STARTPORT);
2163 port->run = 1;
2164
2165 signals = FST_RDL(port->card, v24DebouncedSts[port->index]);
2166 if (signals & (((port->hwif == X21) || (port->hwif == X21D))
2167 ? IPSTS_INDICATE : IPSTS_DCD))
2168 netif_carrier_on(port_to_dev(port));
2169 else
2170 netif_carrier_off(port_to_dev(port));
2171
2172 txq_length = port->txqe - port->txqs;
2173 port->txqe = 0;
2174 port->txqs = 0;
2175 }
2176
2177 }
2178
2179 static void
2180 fst_closeport(struct fst_port_info *port)
2181 {
2182 if (port->card->state == FST_RUNNING) {
2183 if (port->run) {
2184 port->run = 0;
2185 fst_op_lower(port, OPSTS_RTS | OPSTS_DTR);
2186
2187 fst_issue_cmd(port, STOPPORT);
2188 } else {
2189 dbg(DBG_OPEN, "close: port not running\n");
2190 }
2191 }
2192 }
2193
2194 static int
2195 fst_open(struct net_device *dev)
2196 {
2197 int err;
2198 struct fst_port_info *port;
2199
2200 port = dev_to_port(dev);
2201 if (!try_module_get(THIS_MODULE))
2202 return -EBUSY;
2203
2204 if (port->mode != FST_RAW) {
2205 err = hdlc_open(dev);
2206 if (err)
2207 return err;
2208 }
2209
2210 fst_openport(port);
2211 netif_wake_queue(dev);
2212 return 0;
2213 }
2214
2215 static int
2216 fst_close(struct net_device *dev)
2217 {
2218 struct fst_port_info *port;
2219 struct fst_card_info *card;
2220 unsigned char tx_dma_done;
2221 unsigned char rx_dma_done;
2222
2223 port = dev_to_port(dev);
2224 card = port->card;
2225
2226 tx_dma_done = inb(card->pci_conf + DMACSR1);
2227 rx_dma_done = inb(card->pci_conf + DMACSR0);
2228 dbg(DBG_OPEN,
2229 "Port Close: tx_dma_in_progress = %d (%x) rx_dma_in_progress = %d (%x)\n",
2230 card->dmatx_in_progress, tx_dma_done, card->dmarx_in_progress,
2231 rx_dma_done);
2232
2233 netif_stop_queue(dev);
2234 fst_closeport(dev_to_port(dev));
2235 if (port->mode != FST_RAW) {
2236 hdlc_close(dev);
2237 }
2238 module_put(THIS_MODULE);
2239 return 0;
2240 }
2241
2242 static int
2243 fst_attach(struct net_device *dev, unsigned short encoding, unsigned short parity)
2244 {
2245 /*
2246 * Setting currently fixed in FarSync card so we check and forget
2247 */
2248 if (encoding != ENCODING_NRZ || parity != PARITY_CRC16_PR1_CCITT)
2249 return -EINVAL;
2250 return 0;
2251 }
2252
2253 static void
2254 fst_tx_timeout(struct net_device *dev)
2255 {
2256 struct fst_port_info *port;
2257 struct fst_card_info *card;
2258
2259 port = dev_to_port(dev);
2260 card = port->card;
2261 dev->stats.tx_errors++;
2262 dev->stats.tx_aborted_errors++;
2263 dbg(DBG_ASS, "Tx timeout card %d port %d\n",
2264 card->card_no, port->index);
2265 fst_issue_cmd(port, ABORTTX);
2266
2267 dev->trans_start = jiffies;
2268 netif_wake_queue(dev);
2269 port->start = 0;
2270 }
2271
2272 static netdev_tx_t
2273 fst_start_xmit(struct sk_buff *skb, struct net_device *dev)
2274 {
2275 struct fst_card_info *card;
2276 struct fst_port_info *port;
2277 unsigned long flags;
2278 int txq_length;
2279
2280 port = dev_to_port(dev);
2281 card = port->card;
2282 dbg(DBG_TX, "fst_start_xmit: length = %d\n", skb->len);
2283
2284 /* Drop packet with error if we don't have carrier */
2285 if (!netif_carrier_ok(dev)) {
2286 dev_kfree_skb(skb);
2287 dev->stats.tx_errors++;
2288 dev->stats.tx_carrier_errors++;
2289 dbg(DBG_ASS,
2290 "Tried to transmit but no carrier on card %d port %d\n",
2291 card->card_no, port->index);
2292 return NETDEV_TX_OK;
2293 }
2294
2295 /* Drop it if it's too big! MTU failure ? */
2296 if (skb->len > LEN_TX_BUFFER) {
2297 dbg(DBG_ASS, "Packet too large %d vs %d\n", skb->len,
2298 LEN_TX_BUFFER);
2299 dev_kfree_skb(skb);
2300 dev->stats.tx_errors++;
2301 return NETDEV_TX_OK;
2302 }
2303
2304 /*
2305 * We are always going to queue the packet
2306 * so that the bottom half is the only place we tx from
2307 * Check there is room in the port txq
2308 */
2309 spin_lock_irqsave(&card->card_lock, flags);
2310 if ((txq_length = port->txqe - port->txqs) < 0) {
2311 /*
2312 * This is the case where the next free has wrapped but the
2313 * last used hasn't
2314 */
2315 txq_length = txq_length + FST_TXQ_DEPTH;
2316 }
2317 spin_unlock_irqrestore(&card->card_lock, flags);
2318 if (txq_length > fst_txq_high) {
2319 /*
2320 * We have got enough buffers in the pipeline. Ask the network
2321 * layer to stop sending frames down
2322 */
2323 netif_stop_queue(dev);
2324 port->start = 1; /* I'm using this to signal stop sent up */
2325 }
2326
2327 if (txq_length == FST_TXQ_DEPTH - 1) {
2328 /*
2329 * This shouldn't have happened but such is life
2330 */
2331 dev_kfree_skb(skb);
2332 dev->stats.tx_errors++;
2333 dbg(DBG_ASS, "Tx queue overflow card %d port %d\n",
2334 card->card_no, port->index);
2335 return NETDEV_TX_OK;
2336 }
2337
2338 /*
2339 * queue the buffer
2340 */
2341 spin_lock_irqsave(&card->card_lock, flags);
2342 port->txq[port->txqe] = skb;
2343 port->txqe++;
2344 if (port->txqe == FST_TXQ_DEPTH)
2345 port->txqe = 0;
2346 spin_unlock_irqrestore(&card->card_lock, flags);
2347
2348 /* Scehdule the bottom half which now does transmit processing */
2349 fst_q_work_item(&fst_work_txq, card->card_no);
2350 tasklet_schedule(&fst_tx_task);
2351
2352 return NETDEV_TX_OK;
2353 }
2354
2355 /*
2356 * Card setup having checked hardware resources.
2357 * Should be pretty bizarre if we get an error here (kernel memory
2358 * exhaustion is one possibility). If we do see a problem we report it
2359 * via a printk and leave the corresponding interface and all that follow
2360 * disabled.
2361 */
2362 static char *type_strings[] __devinitdata = {
2363 "no hardware", /* Should never be seen */
2364 "FarSync T2P",
2365 "FarSync T4P",
2366 "FarSync T1U",
2367 "FarSync T2U",
2368 "FarSync T4U",
2369 "FarSync TE1"
2370 };
2371
2372 static void __devinit
2373 fst_init_card(struct fst_card_info *card)
2374 {
2375 int i;
2376 int err;
2377
2378 /* We're working on a number of ports based on the card ID. If the
2379 * firmware detects something different later (should never happen)
2380 * we'll have to revise it in some way then.
2381 */
2382 for (i = 0; i < card->nports; i++) {
2383 err = register_hdlc_device(card->ports[i].dev);
2384 if (err < 0) {
2385 int j;
2386 pr_err("Cannot register HDLC device for port %d (errno %d)\n",
2387 i, -err);
2388 for (j = i; j < card->nports; j++) {
2389 free_netdev(card->ports[j].dev);
2390 card->ports[j].dev = NULL;
2391 }
2392 card->nports = i;
2393 break;
2394 }
2395 }
2396
2397 pr_info("%s-%s: %s IRQ%d, %d ports\n",
2398 port_to_dev(&card->ports[0])->name,
2399 port_to_dev(&card->ports[card->nports - 1])->name,
2400 type_strings[card->type], card->irq, card->nports);
2401 }
2402
2403 static const struct net_device_ops fst_ops = {
2404 .ndo_open = fst_open,
2405 .ndo_stop = fst_close,
2406 .ndo_change_mtu = hdlc_change_mtu,
2407 .ndo_start_xmit = hdlc_start_xmit,
2408 .ndo_do_ioctl = fst_ioctl,
2409 .ndo_tx_timeout = fst_tx_timeout,
2410 };
2411
2412 /*
2413 * Initialise card when detected.
2414 * Returns 0 to indicate success, or errno otherwise.
2415 */
2416 static int __devinit
2417 fst_add_one(struct pci_dev *pdev, const struct pci_device_id *ent)
2418 {
2419 static int no_of_cards_added = 0;
2420 struct fst_card_info *card;
2421 int err = 0;
2422 int i;
2423
2424 printk_once(KERN_INFO
2425 pr_fmt("FarSync WAN driver " FST_USER_VERSION
2426 " (c) 2001-2004 FarSite Communications Ltd.\n"));
2427 #if FST_DEBUG
2428 dbg(DBG_ASS, "The value of debug mask is %x\n", fst_debug_mask);
2429 #endif
2430 /*
2431 * We are going to be clever and allow certain cards not to be
2432 * configured. An exclude list can be provided in /etc/modules.conf
2433 */
2434 if (fst_excluded_cards != 0) {
2435 /*
2436 * There are cards to exclude
2437 *
2438 */
2439 for (i = 0; i < fst_excluded_cards; i++) {
2440 if ((pdev->devfn) >> 3 == fst_excluded_list[i]) {
2441 pr_info("FarSync PCI device %d not assigned\n",
2442 (pdev->devfn) >> 3);
2443 return -EBUSY;
2444 }
2445 }
2446 }
2447
2448 /* Allocate driver private data */
2449 card = kzalloc(sizeof (struct fst_card_info), GFP_KERNEL);
2450 if (card == NULL) {
2451 pr_err("FarSync card found but insufficient memory for driver storage\n");
2452 return -ENOMEM;
2453 }
2454
2455 /* Try to enable the device */
2456 if ((err = pci_enable_device(pdev)) != 0) {
2457 pr_err("Failed to enable card. Err %d\n", -err);
2458 kfree(card);
2459 return err;
2460 }
2461
2462 if ((err = pci_request_regions(pdev, "FarSync")) !=0) {
2463 pr_err("Failed to allocate regions. Err %d\n", -err);
2464 pci_disable_device(pdev);
2465 kfree(card);
2466 return err;
2467 }
2468
2469 /* Get virtual addresses of memory regions */
2470 card->pci_conf = pci_resource_start(pdev, 1);
2471 card->phys_mem = pci_resource_start(pdev, 2);
2472 card->phys_ctlmem = pci_resource_start(pdev, 3);
2473 if ((card->mem = ioremap(card->phys_mem, FST_MEMSIZE)) == NULL) {
2474 pr_err("Physical memory remap failed\n");
2475 pci_release_regions(pdev);
2476 pci_disable_device(pdev);
2477 kfree(card);
2478 return -ENODEV;
2479 }
2480 if ((card->ctlmem = ioremap(card->phys_ctlmem, 0x10)) == NULL) {
2481 pr_err("Control memory remap failed\n");
2482 pci_release_regions(pdev);
2483 pci_disable_device(pdev);
2484 kfree(card);
2485 return -ENODEV;
2486 }
2487 dbg(DBG_PCI, "kernel mem %p, ctlmem %p\n", card->mem, card->ctlmem);
2488
2489 /* Register the interrupt handler */
2490 if (request_irq(pdev->irq, fst_intr, IRQF_SHARED, FST_DEV_NAME, card)) {
2491 pr_err("Unable to register interrupt %d\n", card->irq);
2492 pci_release_regions(pdev);
2493 pci_disable_device(pdev);
2494 iounmap(card->ctlmem);
2495 iounmap(card->mem);
2496 kfree(card);
2497 return -ENODEV;
2498 }
2499
2500 /* Record info we need */
2501 card->irq = pdev->irq;
2502 card->type = ent->driver_data;
2503 card->family = ((ent->driver_data == FST_TYPE_T2P) ||
2504 (ent->driver_data == FST_TYPE_T4P))
2505 ? FST_FAMILY_TXP : FST_FAMILY_TXU;
2506 if ((ent->driver_data == FST_TYPE_T1U) ||
2507 (ent->driver_data == FST_TYPE_TE1))
2508 card->nports = 1;
2509 else
2510 card->nports = ((ent->driver_data == FST_TYPE_T2P) ||
2511 (ent->driver_data == FST_TYPE_T2U)) ? 2 : 4;
2512
2513 card->state = FST_UNINIT;
2514 spin_lock_init ( &card->card_lock );
2515
2516 for ( i = 0 ; i < card->nports ; i++ ) {
2517 struct net_device *dev = alloc_hdlcdev(&card->ports[i]);
2518 hdlc_device *hdlc;
2519 if (!dev) {
2520 while (i--)
2521 free_netdev(card->ports[i].dev);
2522 pr_err("FarSync: out of memory\n");
2523 free_irq(card->irq, card);
2524 pci_release_regions(pdev);
2525 pci_disable_device(pdev);
2526 iounmap(card->ctlmem);
2527 iounmap(card->mem);
2528 kfree(card);
2529 return -ENODEV;
2530 }
2531 card->ports[i].dev = dev;
2532 card->ports[i].card = card;
2533 card->ports[i].index = i;
2534 card->ports[i].run = 0;
2535
2536 hdlc = dev_to_hdlc(dev);
2537
2538 /* Fill in the net device info */
2539 /* Since this is a PCI setup this is purely
2540 * informational. Give them the buffer addresses
2541 * and basic card I/O.
2542 */
2543 dev->mem_start = card->phys_mem
2544 + BUF_OFFSET ( txBuffer[i][0][0]);
2545 dev->mem_end = card->phys_mem
2546 + BUF_OFFSET ( txBuffer[i][NUM_TX_BUFFER][0]);
2547 dev->base_addr = card->pci_conf;
2548 dev->irq = card->irq;
2549
2550 dev->netdev_ops = &fst_ops;
2551 dev->tx_queue_len = FST_TX_QUEUE_LEN;
2552 dev->watchdog_timeo = FST_TX_TIMEOUT;
2553 hdlc->attach = fst_attach;
2554 hdlc->xmit = fst_start_xmit;
2555 }
2556
2557 card->device = pdev;
2558
2559 dbg(DBG_PCI, "type %d nports %d irq %d\n", card->type,
2560 card->nports, card->irq);
2561 dbg(DBG_PCI, "conf %04x mem %08x ctlmem %08x\n",
2562 card->pci_conf, card->phys_mem, card->phys_ctlmem);
2563
2564 /* Reset the card's processor */
2565 fst_cpureset(card);
2566 card->state = FST_RESET;
2567
2568 /* Initialise DMA (if required) */
2569 fst_init_dma(card);
2570
2571 /* Record driver data for later use */
2572 pci_set_drvdata(pdev, card);
2573
2574 /* Remainder of card setup */
2575 fst_card_array[no_of_cards_added] = card;
2576 card->card_no = no_of_cards_added++; /* Record instance and bump it */
2577 fst_init_card(card);
2578 if (card->family == FST_FAMILY_TXU) {
2579 /*
2580 * Allocate a dma buffer for transmit and receives
2581 */
2582 card->rx_dma_handle_host =
2583 pci_alloc_consistent(card->device, FST_MAX_MTU,
2584 &card->rx_dma_handle_card);
2585 if (card->rx_dma_handle_host == NULL) {
2586 pr_err("Could not allocate rx dma buffer\n");
2587 fst_disable_intr(card);
2588 pci_release_regions(pdev);
2589 pci_disable_device(pdev);
2590 iounmap(card->ctlmem);
2591 iounmap(card->mem);
2592 kfree(card);
2593 return -ENOMEM;
2594 }
2595 card->tx_dma_handle_host =
2596 pci_alloc_consistent(card->device, FST_MAX_MTU,
2597 &card->tx_dma_handle_card);
2598 if (card->tx_dma_handle_host == NULL) {
2599 pr_err("Could not allocate tx dma buffer\n");
2600 fst_disable_intr(card);
2601 pci_release_regions(pdev);
2602 pci_disable_device(pdev);
2603 iounmap(card->ctlmem);
2604 iounmap(card->mem);
2605 kfree(card);
2606 return -ENOMEM;
2607 }
2608 }
2609 return 0; /* Success */
2610 }
2611
2612 /*
2613 * Cleanup and close down a card
2614 */
2615 static void __devexit
2616 fst_remove_one(struct pci_dev *pdev)
2617 {
2618 struct fst_card_info *card;
2619 int i;
2620
2621 card = pci_get_drvdata(pdev);
2622
2623 for (i = 0; i < card->nports; i++) {
2624 struct net_device *dev = port_to_dev(&card->ports[i]);
2625 unregister_hdlc_device(dev);
2626 }
2627
2628 fst_disable_intr(card);
2629 free_irq(card->irq, card);
2630
2631 iounmap(card->ctlmem);
2632 iounmap(card->mem);
2633 pci_release_regions(pdev);
2634 if (card->family == FST_FAMILY_TXU) {
2635 /*
2636 * Free dma buffers
2637 */
2638 pci_free_consistent(card->device, FST_MAX_MTU,
2639 card->rx_dma_handle_host,
2640 card->rx_dma_handle_card);
2641 pci_free_consistent(card->device, FST_MAX_MTU,
2642 card->tx_dma_handle_host,
2643 card->tx_dma_handle_card);
2644 }
2645 fst_card_array[card->card_no] = NULL;
2646 }
2647
2648 static struct pci_driver fst_driver = {
2649 .name = FST_NAME,
2650 .id_table = fst_pci_dev_id,
2651 .probe = fst_add_one,
2652 .remove = __devexit_p(fst_remove_one),
2653 .suspend = NULL,
2654 .resume = NULL,
2655 };
2656
2657 static int __init
2658 fst_init(void)
2659 {
2660 int i;
2661
2662 for (i = 0; i < FST_MAX_CARDS; i++)
2663 fst_card_array[i] = NULL;
2664 spin_lock_init(&fst_work_q_lock);
2665 return pci_register_driver(&fst_driver);
2666 }
2667
2668 static void __exit
2669 fst_cleanup_module(void)
2670 {
2671 pr_info("FarSync WAN driver unloading\n");
2672 pci_unregister_driver(&fst_driver);
2673 }
2674
2675 module_init(fst_init);
2676 module_exit(fst_cleanup_module);
Linux with added FPC-III support