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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (c) 1996 John Shifflett, GeoLog Consulting
3 * john@geolog.com
4 * jshiffle@netcom.com
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2, or (at your option)
9 * any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 */
16
17/*
18 * Drew Eckhardt's excellent 'Generic NCR5380' sources from Linux-PC
19 * provided much of the inspiration and some of the code for this
20 * driver. Everything I know about Amiga DMA was gleaned from careful
21 * reading of Hamish Mcdonald's original wd33c93 driver; in fact, I
22 * borrowed shamelessly from all over that source. Thanks Hamish!
23 *
24 * _This_ driver is (I feel) an improvement over the old one in
25 * several respects:
26 *
27 * - Target Disconnection/Reconnection is now supported. Any
28 * system with more than one device active on the SCSI bus
29 * will benefit from this. The driver defaults to what I
30 * call 'adaptive disconnect' - meaning that each command
31 * is evaluated individually as to whether or not it should
32 * be run with the option to disconnect/reselect (if the
33 * device chooses), or as a "SCSI-bus-hog".
34 *
35 * - Synchronous data transfers are now supported. Because of
36 * a few devices that choke after telling the driver that
37 * they can do sync transfers, we don't automatically use
38 * this faster protocol - it can be enabled via the command-
39 * line on a device-by-device basis.
40 *
41 * - Runtime operating parameters can now be specified through
42 * the 'amiboot' or the 'insmod' command line. For amiboot do:
43 * "amiboot [usual stuff] wd33c93=blah,blah,blah"
44 * The defaults should be good for most people. See the comment
45 * for 'setup_strings' below for more details.
46 *
47 * - The old driver relied exclusively on what the Western Digital
48 * docs call "Combination Level 2 Commands", which are a great
49 * idea in that the CPU is relieved of a lot of interrupt
50 * overhead. However, by accepting a certain (user-settable)
51 * amount of additional interrupts, this driver achieves
52 * better control over the SCSI bus, and data transfers are
53 * almost as fast while being much easier to define, track,
54 * and debug.
55 *
56 *
57 * TODO:
58 * more speed. linked commands.
59 *
60 *
61 * People with bug reports, wish-lists, complaints, comments,
62 * or improvements are asked to pah-leeez email me (John Shifflett)
63 * at john@geolog.com or jshiffle@netcom.com! I'm anxious to get
64 * this thing into as good a shape as possible, and I'm positive
65 * there are lots of lurking bugs and "Stupid Places".
66 *
67 * Updates:
68 *
69 * Added support for pre -A chips, which don't have advanced features
70 * and will generate CSR_RESEL rather than CSR_RESEL_AM.
71 * Richard Hirst <richard@sleepie.demon.co.uk> August 2000
peter fuersta5d84212007-02-12 15:20:15 +010072 *
73 * Added support for Burst Mode DMA and Fast SCSI. Enabled the use of
74 * default_sx_per for asynchronous data transfers. Added adjustment
75 * of transfer periods in sx_table to the actual input-clock.
76 * peter fuerst <post@pfrst.de> February 2007
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 */
78
Linus Torvalds1da177e2005-04-16 15:20:36 -070079#include <linux/module.h>
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081#include <linux/string.h>
82#include <linux/delay.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070083#include <linux/init.h>
Ralf Baechlecf7f5b42006-03-03 16:34:08 +000084#include <linux/interrupt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#include <linux/blkdev.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
87#include <scsi/scsi.h>
88#include <scsi/scsi_cmnd.h>
89#include <scsi/scsi_device.h>
90#include <scsi/scsi_host.h>
91
Adrian Bunk078dda92007-07-09 12:00:01 -070092#include <asm/irq.h>
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094#include "wd33c93.h"
95
peter fuersta5d84212007-02-12 15:20:15 +010096#define optimum_sx_per(hostdata) (hostdata)->sx_table[1].period_ns
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
peter fuersta5d84212007-02-12 15:20:15 +010098
99#define WD33C93_VERSION "1.26++"
100#define WD33C93_DATE "10/Feb/2007"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
102MODULE_AUTHOR("John Shifflett");
103MODULE_DESCRIPTION("Generic WD33C93 SCSI driver");
104MODULE_LICENSE("GPL");
105
106/*
107 * 'setup_strings' is a single string used to pass operating parameters and
108 * settings from the kernel/module command-line to the driver. 'setup_args[]'
109 * is an array of strings that define the compile-time default values for
110 * these settings. If Linux boots with an amiboot or insmod command-line,
111 * those settings are combined with 'setup_args[]'. Note that amiboot
112 * command-lines are prefixed with "wd33c93=" while insmod uses a
113 * "setup_strings=" prefix. The driver recognizes the following keywords
114 * (lower case required) and arguments:
115 *
116 * - nosync:bitmask -bitmask is a byte where the 1st 7 bits correspond with
117 * the 7 possible SCSI devices. Set a bit to negotiate for
118 * asynchronous transfers on that device. To maintain
119 * backwards compatibility, a command-line such as
120 * "wd33c93=255" will be automatically translated to
121 * "wd33c93=nosync:0xff".
122 * - nodma:x -x = 1 to disable DMA, x = 0 to enable it. Argument is
123 * optional - if not present, same as "nodma:1".
124 * - period:ns -ns is the minimum # of nanoseconds in a SCSI data transfer
125 * period. Default is 500; acceptable values are 250 - 1000.
126 * - disconnect:x -x = 0 to never allow disconnects, 2 to always allow them.
127 * x = 1 does 'adaptive' disconnects, which is the default
128 * and generally the best choice.
129 * - debug:x -If 'DEBUGGING_ON' is defined, x is a bit mask that causes
130 * various types of debug output to printed - see the DB_xxx
131 * defines in wd33c93.h
132 * - clock:x -x = clock input in MHz for WD33c93 chip. Normal values
133 * would be from 8 through 20. Default is 8.
peter fuersta5d84212007-02-12 15:20:15 +0100134 * - burst:x -x = 1 to use Burst Mode (or Demand-Mode) DMA, x = 0 to use
135 * Single Byte DMA, which is the default. Argument is
136 * optional - if not present, same as "burst:1".
137 * - fast:x -x = 1 to enable Fast SCSI, which is only effective with
138 * input-clock divisor 4 (WD33C93_FS_16_20), x = 0 to disable
139 * it, which is the default. Argument is optional - if not
140 * present, same as "fast:1".
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 * - next -No argument. Used to separate blocks of keywords when
142 * there's more than one host adapter in the system.
143 *
144 * Syntax Notes:
145 * - Numeric arguments can be decimal or the '0x' form of hex notation. There
146 * _must_ be a colon between a keyword and its numeric argument, with no
147 * spaces.
148 * - Keywords are separated by commas, no spaces, in the standard kernel
149 * command-line manner.
150 * - A keyword in the 'nth' comma-separated command-line member will overwrite
151 * the 'nth' element of setup_args[]. A blank command-line member (in
152 * other words, a comma with no preceding keyword) will _not_ overwrite
153 * the corresponding setup_args[] element.
154 * - If a keyword is used more than once, the first one applies to the first
155 * SCSI host found, the second to the second card, etc, unless the 'next'
156 * keyword is used to change the order.
157 *
158 * Some amiboot examples (for insmod, use 'setup_strings' instead of 'wd33c93'):
159 * - wd33c93=nosync:255
160 * - wd33c93=nodma
161 * - wd33c93=nodma:1
162 * - wd33c93=disconnect:2,nosync:0x08,period:250
163 * - wd33c93=debug:0x1c
164 */
165
166/* Normally, no defaults are specified */
peter fuersta5d84212007-02-12 15:20:15 +0100167static char *setup_args[] = { "", "", "", "", "", "", "", "", "", "" };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
169static char *setup_strings;
170module_param(setup_strings, charp, 0);
171
172static void wd33c93_execute(struct Scsi_Host *instance);
173
174#ifdef CONFIG_WD33C93_PIO
175static inline uchar
176read_wd33c93(const wd33c93_regs regs, uchar reg_num)
177{
178 uchar data;
179
180 outb(reg_num, regs.SASR);
181 data = inb(regs.SCMD);
182 return data;
183}
184
185static inline unsigned long
186read_wd33c93_count(const wd33c93_regs regs)
187{
188 unsigned long value;
189
190 outb(WD_TRANSFER_COUNT_MSB, regs.SASR);
191 value = inb(regs.SCMD) << 16;
192 value |= inb(regs.SCMD) << 8;
193 value |= inb(regs.SCMD);
194 return value;
195}
196
197static inline uchar
198read_aux_stat(const wd33c93_regs regs)
199{
200 return inb(regs.SASR);
201}
202
203static inline void
204write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value)
205{
206 outb(reg_num, regs.SASR);
207 outb(value, regs.SCMD);
208}
209
210static inline void
211write_wd33c93_count(const wd33c93_regs regs, unsigned long value)
212{
213 outb(WD_TRANSFER_COUNT_MSB, regs.SASR);
214 outb((value >> 16) & 0xff, regs.SCMD);
215 outb((value >> 8) & 0xff, regs.SCMD);
216 outb( value & 0xff, regs.SCMD);
217}
218
219#define write_wd33c93_cmd(regs, cmd) \
220 write_wd33c93((regs), WD_COMMAND, (cmd))
221
222static inline void
223write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[])
224{
225 int i;
226
227 outb(WD_CDB_1, regs.SASR);
228 for (i=0; i<len; i++)
229 outb(cmnd[i], regs.SCMD);
230}
231
232#else /* CONFIG_WD33C93_PIO */
233static inline uchar
234read_wd33c93(const wd33c93_regs regs, uchar reg_num)
235{
236 *regs.SASR = reg_num;
237 mb();
238 return (*regs.SCMD);
239}
240
241static unsigned long
242read_wd33c93_count(const wd33c93_regs regs)
243{
244 unsigned long value;
245
246 *regs.SASR = WD_TRANSFER_COUNT_MSB;
247 mb();
248 value = *regs.SCMD << 16;
249 value |= *regs.SCMD << 8;
250 value |= *regs.SCMD;
251 mb();
252 return value;
253}
254
255static inline uchar
256read_aux_stat(const wd33c93_regs regs)
257{
258 return *regs.SASR;
259}
260
261static inline void
262write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value)
263{
264 *regs.SASR = reg_num;
265 mb();
266 *regs.SCMD = value;
267 mb();
268}
269
270static void
271write_wd33c93_count(const wd33c93_regs regs, unsigned long value)
272{
273 *regs.SASR = WD_TRANSFER_COUNT_MSB;
274 mb();
275 *regs.SCMD = value >> 16;
276 *regs.SCMD = value >> 8;
277 *regs.SCMD = value;
278 mb();
279}
280
281static inline void
282write_wd33c93_cmd(const wd33c93_regs regs, uchar cmd)
283{
284 *regs.SASR = WD_COMMAND;
285 mb();
286 *regs.SCMD = cmd;
287 mb();
288}
289
290static inline void
291write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[])
292{
293 int i;
294
295 *regs.SASR = WD_CDB_1;
296 for (i = 0; i < len; i++)
297 *regs.SCMD = cmnd[i];
298}
299#endif /* CONFIG_WD33C93_PIO */
300
301static inline uchar
302read_1_byte(const wd33c93_regs regs)
303{
304 uchar asr;
305 uchar x = 0;
306
307 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
308 write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO | 0x80);
309 do {
310 asr = read_aux_stat(regs);
311 if (asr & ASR_DBR)
312 x = read_wd33c93(regs, WD_DATA);
313 } while (!(asr & ASR_INT));
314 return x;
315}
316
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317static int
peter fuersta5d84212007-02-12 15:20:15 +0100318round_period(unsigned int period, const struct sx_period *sx_table)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319{
320 int x;
321
322 for (x = 1; sx_table[x].period_ns; x++) {
323 if ((period <= sx_table[x - 0].period_ns) &&
324 (period > sx_table[x - 1].period_ns)) {
325 return x;
326 }
327 }
328 return 7;
329}
330
peter fuersta5d84212007-02-12 15:20:15 +0100331/*
332 * Calculate Synchronous Transfer Register value from SDTR code.
333 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334static uchar
peter fuersta5d84212007-02-12 15:20:15 +0100335calc_sync_xfer(unsigned int period, unsigned int offset, unsigned int fast,
336 const struct sx_period *sx_table)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337{
peter fuersta5d84212007-02-12 15:20:15 +0100338 /* When doing Fast SCSI synchronous data transfers, the corresponding
339 * value in 'sx_table' is two times the actually used transfer period.
340 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 uchar result;
342
peter fuersta5d84212007-02-12 15:20:15 +0100343 if (offset && fast) {
344 fast = STR_FSS;
345 period *= 2;
346 } else {
347 fast = 0;
348 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 period *= 4; /* convert SDTR code to ns */
peter fuersta5d84212007-02-12 15:20:15 +0100350 result = sx_table[round_period(period,sx_table)].reg_value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 result |= (offset < OPTIMUM_SX_OFF) ? offset : OPTIMUM_SX_OFF;
peter fuersta5d84212007-02-12 15:20:15 +0100352 result |= fast;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 return result;
354}
355
peter fuersta5d84212007-02-12 15:20:15 +0100356/*
357 * Calculate SDTR code bytes [3],[4] from period and offset.
358 */
359static inline void
360calc_sync_msg(unsigned int period, unsigned int offset, unsigned int fast,
361 uchar msg[2])
362{
363 /* 'period' is a "normal"-mode value, like the ones in 'sx_table'. The
364 * actually used transfer period for Fast SCSI synchronous data
365 * transfers is half that value.
366 */
367 period /= 4;
368 if (offset && fast)
369 period /= 2;
370 msg[0] = period;
371 msg[1] = offset;
372}
373
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374int
375wd33c93_queuecommand(struct scsi_cmnd *cmd,
376 void (*done)(struct scsi_cmnd *))
377{
378 struct WD33C93_hostdata *hostdata;
379 struct scsi_cmnd *tmp;
380
381 hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata;
382
383 DB(DB_QUEUE_COMMAND,
384 printk("Q-%d-%02x-%ld( ", cmd->device->id, cmd->cmnd[0], cmd->pid))
385
386/* Set up a few fields in the scsi_cmnd structure for our own use:
387 * - host_scribble is the pointer to the next cmd in the input queue
388 * - scsi_done points to the routine we call when a cmd is finished
389 * - result is what you'd expect
390 */
391 cmd->host_scribble = NULL;
392 cmd->scsi_done = done;
393 cmd->result = 0;
394
395/* We use the Scsi_Pointer structure that's included with each command
396 * as a scratchpad (as it's intended to be used!). The handy thing about
397 * the SCp.xxx fields is that they're always associated with a given
398 * cmd, and are preserved across disconnect-reselect. This means we
399 * can pretty much ignore SAVE_POINTERS and RESTORE_POINTERS messages
400 * if we keep all the critical pointers and counters in SCp:
401 * - SCp.ptr is the pointer into the RAM buffer
402 * - SCp.this_residual is the size of that buffer
403 * - SCp.buffer points to the current scatter-gather buffer
404 * - SCp.buffers_residual tells us how many S.G. buffers there are
405 * - SCp.have_data_in is not used
406 * - SCp.sent_command is not used
407 * - SCp.phase records this command's SRCID_ER bit setting
408 */
409
410 if (cmd->use_sg) {
Christoph Hellwig79bd3f82006-07-14 10:29:34 +0200411 cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 cmd->SCp.buffers_residual = cmd->use_sg - 1;
413 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page) +
414 cmd->SCp.buffer->offset;
415 cmd->SCp.this_residual = cmd->SCp.buffer->length;
416 } else {
417 cmd->SCp.buffer = NULL;
418 cmd->SCp.buffers_residual = 0;
419 cmd->SCp.ptr = (char *) cmd->request_buffer;
420 cmd->SCp.this_residual = cmd->request_bufflen;
421 }
422
423/* WD docs state that at the conclusion of a "LEVEL2" command, the
424 * status byte can be retrieved from the LUN register. Apparently,
425 * this is the case only for *uninterrupted* LEVEL2 commands! If
426 * there are any unexpected phases entered, even if they are 100%
427 * legal (different devices may choose to do things differently),
428 * the LEVEL2 command sequence is exited. This often occurs prior
429 * to receiving the status byte, in which case the driver does a
430 * status phase interrupt and gets the status byte on its own.
431 * While such a command can then be "resumed" (ie restarted to
432 * finish up as a LEVEL2 command), the LUN register will NOT be
433 * a valid status byte at the command's conclusion, and we must
434 * use the byte obtained during the earlier interrupt. Here, we
435 * preset SCp.Status to an illegal value (0xff) so that when
436 * this command finally completes, we can tell where the actual
437 * status byte is stored.
438 */
439
440 cmd->SCp.Status = ILLEGAL_STATUS_BYTE;
441
442 /*
443 * Add the cmd to the end of 'input_Q'. Note that REQUEST SENSE
444 * commands are added to the head of the queue so that the desired
445 * sense data is not lost before REQUEST_SENSE executes.
446 */
447
448 spin_lock_irq(&hostdata->lock);
449
450 if (!(hostdata->input_Q) || (cmd->cmnd[0] == REQUEST_SENSE)) {
451 cmd->host_scribble = (uchar *) hostdata->input_Q;
452 hostdata->input_Q = cmd;
453 } else { /* find the end of the queue */
454 for (tmp = (struct scsi_cmnd *) hostdata->input_Q;
455 tmp->host_scribble;
456 tmp = (struct scsi_cmnd *) tmp->host_scribble) ;
457 tmp->host_scribble = (uchar *) cmd;
458 }
459
460/* We know that there's at least one command in 'input_Q' now.
461 * Go see if any of them are runnable!
462 */
463
464 wd33c93_execute(cmd->device->host);
465
466 DB(DB_QUEUE_COMMAND, printk(")Q-%ld ", cmd->pid))
467
468 spin_unlock_irq(&hostdata->lock);
469 return 0;
470}
471
472/*
473 * This routine attempts to start a scsi command. If the host_card is
474 * already connected, we give up immediately. Otherwise, look through
475 * the input_Q, using the first command we find that's intended
476 * for a currently non-busy target/lun.
477 *
478 * wd33c93_execute() is always called with interrupts disabled or from
479 * the wd33c93_intr itself, which means that a wd33c93 interrupt
480 * cannot occur while we are in here.
481 */
482static void
483wd33c93_execute(struct Scsi_Host *instance)
484{
485 struct WD33C93_hostdata *hostdata =
486 (struct WD33C93_hostdata *) instance->hostdata;
487 const wd33c93_regs regs = hostdata->regs;
488 struct scsi_cmnd *cmd, *prev;
489
490 DB(DB_EXECUTE, printk("EX("))
491 if (hostdata->selecting || hostdata->connected) {
492 DB(DB_EXECUTE, printk(")EX-0 "))
493 return;
494 }
495
496 /*
497 * Search through the input_Q for a command destined
498 * for an idle target/lun.
499 */
500
501 cmd = (struct scsi_cmnd *) hostdata->input_Q;
Al Viroa5d361f2006-01-12 01:06:34 -0800502 prev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 while (cmd) {
504 if (!(hostdata->busy[cmd->device->id] & (1 << cmd->device->lun)))
505 break;
506 prev = cmd;
507 cmd = (struct scsi_cmnd *) cmd->host_scribble;
508 }
509
510 /* quit if queue empty or all possible targets are busy */
511
512 if (!cmd) {
513 DB(DB_EXECUTE, printk(")EX-1 "))
514 return;
515 }
516
517 /* remove command from queue */
518
519 if (prev)
520 prev->host_scribble = cmd->host_scribble;
521 else
522 hostdata->input_Q = (struct scsi_cmnd *) cmd->host_scribble;
523
524#ifdef PROC_STATISTICS
525 hostdata->cmd_cnt[cmd->device->id]++;
526#endif
527
528 /*
529 * Start the selection process
530 */
531
532 if (cmd->sc_data_direction == DMA_TO_DEVICE)
533 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);
534 else
535 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id | DSTID_DPD);
536
537/* Now we need to figure out whether or not this command is a good
538 * candidate for disconnect/reselect. We guess to the best of our
539 * ability, based on a set of hierarchical rules. When several
540 * devices are operating simultaneously, disconnects are usually
541 * an advantage. In a single device system, or if only 1 device
542 * is being accessed, transfers usually go faster if disconnects
543 * are not allowed:
544 *
545 * + Commands should NEVER disconnect if hostdata->disconnect =
546 * DIS_NEVER (this holds for tape drives also), and ALWAYS
547 * disconnect if hostdata->disconnect = DIS_ALWAYS.
548 * + Tape drive commands should always be allowed to disconnect.
549 * + Disconnect should be allowed if disconnected_Q isn't empty.
550 * + Commands should NOT disconnect if input_Q is empty.
551 * + Disconnect should be allowed if there are commands in input_Q
552 * for a different target/lun. In this case, the other commands
553 * should be made disconnect-able, if not already.
554 *
555 * I know, I know - this code would flunk me out of any
556 * "C Programming 101" class ever offered. But it's easy
557 * to change around and experiment with for now.
558 */
559
560 cmd->SCp.phase = 0; /* assume no disconnect */
561 if (hostdata->disconnect == DIS_NEVER)
562 goto no;
563 if (hostdata->disconnect == DIS_ALWAYS)
564 goto yes;
565 if (cmd->device->type == 1) /* tape drive? */
566 goto yes;
567 if (hostdata->disconnected_Q) /* other commands disconnected? */
568 goto yes;
569 if (!(hostdata->input_Q)) /* input_Q empty? */
570 goto no;
571 for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;
572 prev = (struct scsi_cmnd *) prev->host_scribble) {
573 if ((prev->device->id != cmd->device->id) ||
574 (prev->device->lun != cmd->device->lun)) {
575 for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;
576 prev = (struct scsi_cmnd *) prev->host_scribble)
577 prev->SCp.phase = 1;
578 goto yes;
579 }
580 }
581
582 goto no;
583
584 yes:
585 cmd->SCp.phase = 1;
586
587#ifdef PROC_STATISTICS
588 hostdata->disc_allowed_cnt[cmd->device->id]++;
589#endif
590
591 no:
592
593 write_wd33c93(regs, WD_SOURCE_ID, ((cmd->SCp.phase) ? SRCID_ER : 0));
594
595 write_wd33c93(regs, WD_TARGET_LUN, cmd->device->lun);
596 write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
597 hostdata->sync_xfer[cmd->device->id]);
598 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
599
600 if ((hostdata->level2 == L2_NONE) ||
601 (hostdata->sync_stat[cmd->device->id] == SS_UNSET)) {
602
603 /*
604 * Do a 'Select-With-ATN' command. This will end with
605 * one of the following interrupts:
606 * CSR_RESEL_AM: failure - can try again later.
607 * CSR_TIMEOUT: failure - give up.
608 * CSR_SELECT: success - proceed.
609 */
610
611 hostdata->selecting = cmd;
612
613/* Every target has its own synchronous transfer setting, kept in the
614 * sync_xfer array, and a corresponding status byte in sync_stat[].
615 * Each target's sync_stat[] entry is initialized to SX_UNSET, and its
616 * sync_xfer[] entry is initialized to the default/safe value. SS_UNSET
617 * means that the parameters are undetermined as yet, and that we
618 * need to send an SDTR message to this device after selection is
619 * complete: We set SS_FIRST to tell the interrupt routine to do so.
620 * If we've been asked not to try synchronous transfers on this
621 * target (and _all_ luns within it), we'll still send the SDTR message
622 * later, but at that time we'll negotiate for async by specifying a
623 * sync fifo depth of 0.
624 */
625 if (hostdata->sync_stat[cmd->device->id] == SS_UNSET)
626 hostdata->sync_stat[cmd->device->id] = SS_FIRST;
627 hostdata->state = S_SELECTING;
628 write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */
629 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN);
630 } else {
631
632 /*
633 * Do a 'Select-With-ATN-Xfer' command. This will end with
634 * one of the following interrupts:
635 * CSR_RESEL_AM: failure - can try again later.
636 * CSR_TIMEOUT: failure - give up.
637 * anything else: success - proceed.
638 */
639
640 hostdata->connected = cmd;
641 write_wd33c93(regs, WD_COMMAND_PHASE, 0);
642
643 /* copy command_descriptor_block into WD chip
644 * (take advantage of auto-incrementing)
645 */
646
647 write_wd33c93_cdb(regs, cmd->cmd_len, cmd->cmnd);
648
649 /* The wd33c93 only knows about Group 0, 1, and 5 commands when
650 * it's doing a 'select-and-transfer'. To be safe, we write the
651 * size of the CDB into the OWN_ID register for every case. This
652 * way there won't be problems with vendor-unique, audio, etc.
653 */
654
655 write_wd33c93(regs, WD_OWN_ID, cmd->cmd_len);
656
657 /* When doing a non-disconnect command with DMA, we can save
658 * ourselves a DATA phase interrupt later by setting everything
659 * up ahead of time.
660 */
661
662 if ((cmd->SCp.phase == 0) && (hostdata->no_dma == 0)) {
663 if (hostdata->dma_setup(cmd,
664 (cmd->sc_data_direction == DMA_TO_DEVICE) ?
665 DATA_OUT_DIR : DATA_IN_DIR))
666 write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */
667 else {
668 write_wd33c93_count(regs,
669 cmd->SCp.this_residual);
670 write_wd33c93(regs, WD_CONTROL,
peter fuersta5d84212007-02-12 15:20:15 +0100671 CTRL_IDI | CTRL_EDI | hostdata->dma_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 hostdata->dma = D_DMA_RUNNING;
673 }
674 } else
675 write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */
676
677 hostdata->state = S_RUNNING_LEVEL2;
678 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
679 }
680
681 /*
682 * Since the SCSI bus can handle only 1 connection at a time,
683 * we get out of here now. If the selection fails, or when
684 * the command disconnects, we'll come back to this routine
685 * to search the input_Q again...
686 */
687
688 DB(DB_EXECUTE,
689 printk("%s%ld)EX-2 ", (cmd->SCp.phase) ? "d:" : "", cmd->pid))
690}
691
692static void
693transfer_pio(const wd33c93_regs regs, uchar * buf, int cnt,
694 int data_in_dir, struct WD33C93_hostdata *hostdata)
695{
696 uchar asr;
697
698 DB(DB_TRANSFER,
699 printk("(%p,%d,%s:", buf, cnt, data_in_dir ? "in" : "out"))
700
701 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
702 write_wd33c93_count(regs, cnt);
703 write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
704 if (data_in_dir) {
705 do {
706 asr = read_aux_stat(regs);
707 if (asr & ASR_DBR)
708 *buf++ = read_wd33c93(regs, WD_DATA);
709 } while (!(asr & ASR_INT));
710 } else {
711 do {
712 asr = read_aux_stat(regs);
713 if (asr & ASR_DBR)
714 write_wd33c93(regs, WD_DATA, *buf++);
715 } while (!(asr & ASR_INT));
716 }
717
718 /* Note: we are returning with the interrupt UN-cleared.
719 * Since (presumably) an entire I/O operation has
720 * completed, the bus phase is probably different, and
721 * the interrupt routine will discover this when it
722 * responds to the uncleared int.
723 */
724
725}
726
727static void
728transfer_bytes(const wd33c93_regs regs, struct scsi_cmnd *cmd,
729 int data_in_dir)
730{
731 struct WD33C93_hostdata *hostdata;
732 unsigned long length;
733
734 hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata;
735
736/* Normally, you'd expect 'this_residual' to be non-zero here.
737 * In a series of scatter-gather transfers, however, this
738 * routine will usually be called with 'this_residual' equal
739 * to 0 and 'buffers_residual' non-zero. This means that a
740 * previous transfer completed, clearing 'this_residual', and
741 * now we need to setup the next scatter-gather buffer as the
742 * source or destination for THIS transfer.
743 */
744 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
745 ++cmd->SCp.buffer;
746 --cmd->SCp.buffers_residual;
747 cmd->SCp.this_residual = cmd->SCp.buffer->length;
748 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page) +
749 cmd->SCp.buffer->offset;
750 }
peter fuersta5d84212007-02-12 15:20:15 +0100751 if (!cmd->SCp.this_residual) /* avoid bogus setups */
752 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753
754 write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
755 hostdata->sync_xfer[cmd->device->id]);
756
757/* 'hostdata->no_dma' is TRUE if we don't even want to try DMA.
758 * Update 'this_residual' and 'ptr' after 'transfer_pio()' returns.
759 */
760
761 if (hostdata->no_dma || hostdata->dma_setup(cmd, data_in_dir)) {
762#ifdef PROC_STATISTICS
763 hostdata->pio_cnt++;
764#endif
765 transfer_pio(regs, (uchar *) cmd->SCp.ptr,
766 cmd->SCp.this_residual, data_in_dir, hostdata);
767 length = cmd->SCp.this_residual;
768 cmd->SCp.this_residual = read_wd33c93_count(regs);
769 cmd->SCp.ptr += (length - cmd->SCp.this_residual);
770 }
771
772/* We are able to do DMA (in fact, the Amiga hardware is
773 * already going!), so start up the wd33c93 in DMA mode.
774 * We set 'hostdata->dma' = D_DMA_RUNNING so that when the
775 * transfer completes and causes an interrupt, we're
776 * reminded to tell the Amiga to shut down its end. We'll
777 * postpone the updating of 'this_residual' and 'ptr'
778 * until then.
779 */
780
781 else {
782#ifdef PROC_STATISTICS
783 hostdata->dma_cnt++;
784#endif
peter fuersta5d84212007-02-12 15:20:15 +0100785 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | hostdata->dma_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 write_wd33c93_count(regs, cmd->SCp.this_residual);
787
788 if ((hostdata->level2 >= L2_DATA) ||
789 (hostdata->level2 == L2_BASIC && cmd->SCp.phase == 0)) {
790 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
791 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
792 hostdata->state = S_RUNNING_LEVEL2;
793 } else
794 write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
795
796 hostdata->dma = D_DMA_RUNNING;
797 }
798}
799
800void
801wd33c93_intr(struct Scsi_Host *instance)
802{
803 struct WD33C93_hostdata *hostdata =
804 (struct WD33C93_hostdata *) instance->hostdata;
805 const wd33c93_regs regs = hostdata->regs;
806 struct scsi_cmnd *patch, *cmd;
807 uchar asr, sr, phs, id, lun, *ucp, msg;
808 unsigned long length, flags;
809
810 asr = read_aux_stat(regs);
811 if (!(asr & ASR_INT) || (asr & ASR_BSY))
812 return;
813
814 spin_lock_irqsave(&hostdata->lock, flags);
815
816#ifdef PROC_STATISTICS
817 hostdata->int_cnt++;
818#endif
819
820 cmd = (struct scsi_cmnd *) hostdata->connected; /* assume we're connected */
821 sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear the interrupt */
822 phs = read_wd33c93(regs, WD_COMMAND_PHASE);
823
824 DB(DB_INTR, printk("{%02x:%02x-", asr, sr))
825
826/* After starting a DMA transfer, the next interrupt
827 * is guaranteed to be in response to completion of
828 * the transfer. Since the Amiga DMA hardware runs in
829 * in an open-ended fashion, it needs to be told when
830 * to stop; do that here if D_DMA_RUNNING is true.
831 * Also, we have to update 'this_residual' and 'ptr'
832 * based on the contents of the TRANSFER_COUNT register,
833 * in case the device decided to do an intermediate
834 * disconnect (a device may do this if it has to do a
835 * seek, or just to be nice and let other devices have
836 * some bus time during long transfers). After doing
837 * whatever is needed, we go on and service the WD3393
838 * interrupt normally.
839 */
840 if (hostdata->dma == D_DMA_RUNNING) {
841 DB(DB_TRANSFER,
842 printk("[%p/%d:", cmd->SCp.ptr, cmd->SCp.this_residual))
843 hostdata->dma_stop(cmd->device->host, cmd, 1);
844 hostdata->dma = D_DMA_OFF;
845 length = cmd->SCp.this_residual;
846 cmd->SCp.this_residual = read_wd33c93_count(regs);
847 cmd->SCp.ptr += (length - cmd->SCp.this_residual);
848 DB(DB_TRANSFER,
849 printk("%p/%d]", cmd->SCp.ptr, cmd->SCp.this_residual))
850 }
851
852/* Respond to the specific WD3393 interrupt - there are quite a few! */
853 switch (sr) {
854 case CSR_TIMEOUT:
855 DB(DB_INTR, printk("TIMEOUT"))
856
857 if (hostdata->state == S_RUNNING_LEVEL2)
858 hostdata->connected = NULL;
859 else {
860 cmd = (struct scsi_cmnd *) hostdata->selecting; /* get a valid cmd */
861 hostdata->selecting = NULL;
862 }
863
864 cmd->result = DID_NO_CONNECT << 16;
865 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
866 hostdata->state = S_UNCONNECTED;
867 cmd->scsi_done(cmd);
868
869 /* From esp.c:
870 * There is a window of time within the scsi_done() path
871 * of execution where interrupts are turned back on full
872 * blast and left that way. During that time we could
873 * reconnect to a disconnected command, then we'd bomb
874 * out below. We could also end up executing two commands
875 * at _once_. ...just so you know why the restore_flags()
876 * is here...
877 */
878
879 spin_unlock_irqrestore(&hostdata->lock, flags);
880
881/* We are not connected to a target - check to see if there
882 * are commands waiting to be executed.
883 */
884
885 wd33c93_execute(instance);
886 break;
887
888/* Note: this interrupt should not occur in a LEVEL2 command */
889
890 case CSR_SELECT:
891 DB(DB_INTR, printk("SELECT"))
892 hostdata->connected = cmd =
893 (struct scsi_cmnd *) hostdata->selecting;
894 hostdata->selecting = NULL;
895
896 /* construct an IDENTIFY message with correct disconnect bit */
897
898 hostdata->outgoing_msg[0] = (0x80 | 0x00 | cmd->device->lun);
899 if (cmd->SCp.phase)
900 hostdata->outgoing_msg[0] |= 0x40;
901
902 if (hostdata->sync_stat[cmd->device->id] == SS_FIRST) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903
904 hostdata->sync_stat[cmd->device->id] = SS_WAITING;
905
906/* Tack on a 2nd message to ask about synchronous transfers. If we've
907 * been asked to do only asynchronous transfers on this device, we
908 * request a fifo depth of 0, which is equivalent to async - should
909 * solve the problems some people have had with GVP's Guru ROM.
910 */
911
912 hostdata->outgoing_msg[1] = EXTENDED_MESSAGE;
913 hostdata->outgoing_msg[2] = 3;
914 hostdata->outgoing_msg[3] = EXTENDED_SDTR;
915 if (hostdata->no_sync & (1 << cmd->device->id)) {
peter fuersta5d84212007-02-12 15:20:15 +0100916 calc_sync_msg(hostdata->default_sx_per, 0,
917 0, hostdata->outgoing_msg + 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 } else {
peter fuersta5d84212007-02-12 15:20:15 +0100919 calc_sync_msg(optimum_sx_per(hostdata),
920 OPTIMUM_SX_OFF,
921 hostdata->fast,
922 hostdata->outgoing_msg + 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 }
924 hostdata->outgoing_len = 6;
peter fuersta5d84212007-02-12 15:20:15 +0100925#ifdef SYNC_DEBUG
926 ucp = hostdata->outgoing_msg + 1;
927 printk(" sending SDTR %02x03%02x%02x%02x ",
928 ucp[0], ucp[2], ucp[3], ucp[4]);
929#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 } else
931 hostdata->outgoing_len = 1;
932
933 hostdata->state = S_CONNECTED;
934 spin_unlock_irqrestore(&hostdata->lock, flags);
935 break;
936
937 case CSR_XFER_DONE | PHS_DATA_IN:
938 case CSR_UNEXP | PHS_DATA_IN:
939 case CSR_SRV_REQ | PHS_DATA_IN:
940 DB(DB_INTR,
941 printk("IN-%d.%d", cmd->SCp.this_residual,
942 cmd->SCp.buffers_residual))
943 transfer_bytes(regs, cmd, DATA_IN_DIR);
944 if (hostdata->state != S_RUNNING_LEVEL2)
945 hostdata->state = S_CONNECTED;
946 spin_unlock_irqrestore(&hostdata->lock, flags);
947 break;
948
949 case CSR_XFER_DONE | PHS_DATA_OUT:
950 case CSR_UNEXP | PHS_DATA_OUT:
951 case CSR_SRV_REQ | PHS_DATA_OUT:
952 DB(DB_INTR,
953 printk("OUT-%d.%d", cmd->SCp.this_residual,
954 cmd->SCp.buffers_residual))
955 transfer_bytes(regs, cmd, DATA_OUT_DIR);
956 if (hostdata->state != S_RUNNING_LEVEL2)
957 hostdata->state = S_CONNECTED;
958 spin_unlock_irqrestore(&hostdata->lock, flags);
959 break;
960
961/* Note: this interrupt should not occur in a LEVEL2 command */
962
963 case CSR_XFER_DONE | PHS_COMMAND:
964 case CSR_UNEXP | PHS_COMMAND:
965 case CSR_SRV_REQ | PHS_COMMAND:
966 DB(DB_INTR, printk("CMND-%02x,%ld", cmd->cmnd[0], cmd->pid))
967 transfer_pio(regs, cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR,
968 hostdata);
969 hostdata->state = S_CONNECTED;
970 spin_unlock_irqrestore(&hostdata->lock, flags);
971 break;
972
973 case CSR_XFER_DONE | PHS_STATUS:
974 case CSR_UNEXP | PHS_STATUS:
975 case CSR_SRV_REQ | PHS_STATUS:
976 DB(DB_INTR, printk("STATUS="))
977 cmd->SCp.Status = read_1_byte(regs);
978 DB(DB_INTR, printk("%02x", cmd->SCp.Status))
979 if (hostdata->level2 >= L2_BASIC) {
980 sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear interrupt */
Roman Zippel882905c2006-06-23 02:04:57 -0700981 udelay(7);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 hostdata->state = S_RUNNING_LEVEL2;
983 write_wd33c93(regs, WD_COMMAND_PHASE, 0x50);
984 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
985 } else {
986 hostdata->state = S_CONNECTED;
987 }
988 spin_unlock_irqrestore(&hostdata->lock, flags);
989 break;
990
991 case CSR_XFER_DONE | PHS_MESS_IN:
992 case CSR_UNEXP | PHS_MESS_IN:
993 case CSR_SRV_REQ | PHS_MESS_IN:
994 DB(DB_INTR, printk("MSG_IN="))
995
996 msg = read_1_byte(regs);
997 sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear interrupt */
Roman Zippel882905c2006-06-23 02:04:57 -0700998 udelay(7);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999
1000 hostdata->incoming_msg[hostdata->incoming_ptr] = msg;
1001 if (hostdata->incoming_msg[0] == EXTENDED_MESSAGE)
1002 msg = EXTENDED_MESSAGE;
1003 else
1004 hostdata->incoming_ptr = 0;
1005
1006 cmd->SCp.Message = msg;
1007 switch (msg) {
1008
1009 case COMMAND_COMPLETE:
1010 DB(DB_INTR, printk("CCMP-%ld", cmd->pid))
1011 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1012 hostdata->state = S_PRE_CMP_DISC;
1013 break;
1014
1015 case SAVE_POINTERS:
1016 DB(DB_INTR, printk("SDP"))
1017 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1018 hostdata->state = S_CONNECTED;
1019 break;
1020
1021 case RESTORE_POINTERS:
1022 DB(DB_INTR, printk("RDP"))
1023 if (hostdata->level2 >= L2_BASIC) {
1024 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
1025 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1026 hostdata->state = S_RUNNING_LEVEL2;
1027 } else {
1028 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1029 hostdata->state = S_CONNECTED;
1030 }
1031 break;
1032
1033 case DISCONNECT:
1034 DB(DB_INTR, printk("DIS"))
1035 cmd->device->disconnect = 1;
1036 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1037 hostdata->state = S_PRE_TMP_DISC;
1038 break;
1039
1040 case MESSAGE_REJECT:
1041 DB(DB_INTR, printk("REJ"))
1042#ifdef SYNC_DEBUG
1043 printk("-REJ-");
1044#endif
peter fuersta5d84212007-02-12 15:20:15 +01001045 if (hostdata->sync_stat[cmd->device->id] == SS_WAITING) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 hostdata->sync_stat[cmd->device->id] = SS_SET;
peter fuersta5d84212007-02-12 15:20:15 +01001047 /* we want default_sx_per, not DEFAULT_SX_PER */
1048 hostdata->sync_xfer[cmd->device->id] =
1049 calc_sync_xfer(hostdata->default_sx_per
1050 / 4, 0, 0, hostdata->sx_table);
1051 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1053 hostdata->state = S_CONNECTED;
1054 break;
1055
1056 case EXTENDED_MESSAGE:
1057 DB(DB_INTR, printk("EXT"))
1058
1059 ucp = hostdata->incoming_msg;
1060
1061#ifdef SYNC_DEBUG
1062 printk("%02x", ucp[hostdata->incoming_ptr]);
1063#endif
1064 /* Is this the last byte of the extended message? */
1065
1066 if ((hostdata->incoming_ptr >= 2) &&
1067 (hostdata->incoming_ptr == (ucp[1] + 1))) {
1068
1069 switch (ucp[2]) { /* what's the EXTENDED code? */
1070 case EXTENDED_SDTR:
peter fuersta5d84212007-02-12 15:20:15 +01001071 /* default to default async period */
1072 id = calc_sync_xfer(hostdata->
1073 default_sx_per / 4, 0,
1074 0, hostdata->sx_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 if (hostdata->sync_stat[cmd->device->id] !=
1076 SS_WAITING) {
1077
1078/* A device has sent an unsolicited SDTR message; rather than go
1079 * through the effort of decoding it and then figuring out what
1080 * our reply should be, we're just gonna say that we have a
1081 * synchronous fifo depth of 0. This will result in asynchronous
1082 * transfers - not ideal but so much easier.
1083 * Actually, this is OK because it assures us that if we don't
1084 * specifically ask for sync transfers, we won't do any.
1085 */
1086
1087 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */
1088 hostdata->outgoing_msg[0] =
1089 EXTENDED_MESSAGE;
1090 hostdata->outgoing_msg[1] = 3;
1091 hostdata->outgoing_msg[2] =
1092 EXTENDED_SDTR;
peter fuersta5d84212007-02-12 15:20:15 +01001093 calc_sync_msg(hostdata->
1094 default_sx_per, 0,
1095 0, hostdata->outgoing_msg + 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 hostdata->outgoing_len = 5;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 } else {
peter fuersta5d84212007-02-12 15:20:15 +01001098 if (ucp[4]) /* well, sync transfer */
1099 id = calc_sync_xfer(ucp[3], ucp[4],
1100 hostdata->fast,
1101 hostdata->sx_table);
1102 else if (ucp[3]) /* very unlikely... */
1103 id = calc_sync_xfer(ucp[3], ucp[4],
1104 0, hostdata->sx_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105 }
peter fuersta5d84212007-02-12 15:20:15 +01001106 hostdata->sync_xfer[cmd->device->id] = id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107#ifdef SYNC_DEBUG
peter fuersta5d84212007-02-12 15:20:15 +01001108 printk(" sync_xfer=%02x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 hostdata->sync_xfer[cmd->device->id]);
1110#endif
1111 hostdata->sync_stat[cmd->device->id] =
1112 SS_SET;
1113 write_wd33c93_cmd(regs,
1114 WD_CMD_NEGATE_ACK);
1115 hostdata->state = S_CONNECTED;
1116 break;
1117 case EXTENDED_WDTR:
1118 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */
1119 printk("sending WDTR ");
1120 hostdata->outgoing_msg[0] =
1121 EXTENDED_MESSAGE;
1122 hostdata->outgoing_msg[1] = 2;
1123 hostdata->outgoing_msg[2] =
1124 EXTENDED_WDTR;
1125 hostdata->outgoing_msg[3] = 0; /* 8 bit transfer width */
1126 hostdata->outgoing_len = 4;
1127 write_wd33c93_cmd(regs,
1128 WD_CMD_NEGATE_ACK);
1129 hostdata->state = S_CONNECTED;
1130 break;
1131 default:
1132 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */
1133 printk
1134 ("Rejecting Unknown Extended Message(%02x). ",
1135 ucp[2]);
1136 hostdata->outgoing_msg[0] =
1137 MESSAGE_REJECT;
1138 hostdata->outgoing_len = 1;
1139 write_wd33c93_cmd(regs,
1140 WD_CMD_NEGATE_ACK);
1141 hostdata->state = S_CONNECTED;
1142 break;
1143 }
1144 hostdata->incoming_ptr = 0;
1145 }
1146
1147 /* We need to read more MESS_IN bytes for the extended message */
1148
1149 else {
1150 hostdata->incoming_ptr++;
1151 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1152 hostdata->state = S_CONNECTED;
1153 }
1154 break;
1155
1156 default:
1157 printk("Rejecting Unknown Message(%02x) ", msg);
1158 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */
1159 hostdata->outgoing_msg[0] = MESSAGE_REJECT;
1160 hostdata->outgoing_len = 1;
1161 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1162 hostdata->state = S_CONNECTED;
1163 }
1164 spin_unlock_irqrestore(&hostdata->lock, flags);
1165 break;
1166
1167/* Note: this interrupt will occur only after a LEVEL2 command */
1168
1169 case CSR_SEL_XFER_DONE:
1170
1171/* Make sure that reselection is enabled at this point - it may
1172 * have been turned off for the command that just completed.
1173 */
1174
1175 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1176 if (phs == 0x60) {
1177 DB(DB_INTR, printk("SX-DONE-%ld", cmd->pid))
1178 cmd->SCp.Message = COMMAND_COMPLETE;
1179 lun = read_wd33c93(regs, WD_TARGET_LUN);
1180 DB(DB_INTR, printk(":%d.%d", cmd->SCp.Status, lun))
1181 hostdata->connected = NULL;
1182 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1183 hostdata->state = S_UNCONNECTED;
1184 if (cmd->SCp.Status == ILLEGAL_STATUS_BYTE)
1185 cmd->SCp.Status = lun;
1186 if (cmd->cmnd[0] == REQUEST_SENSE
1187 && cmd->SCp.Status != GOOD)
1188 cmd->result =
1189 (cmd->
1190 result & 0x00ffff) | (DID_ERROR << 16);
1191 else
1192 cmd->result =
1193 cmd->SCp.Status | (cmd->SCp.Message << 8);
1194 cmd->scsi_done(cmd);
1195
1196/* We are no longer connected to a target - check to see if
1197 * there are commands waiting to be executed.
1198 */
1199 spin_unlock_irqrestore(&hostdata->lock, flags);
1200 wd33c93_execute(instance);
1201 } else {
1202 printk
1203 ("%02x:%02x:%02x-%ld: Unknown SEL_XFER_DONE phase!!---",
1204 asr, sr, phs, cmd->pid);
1205 spin_unlock_irqrestore(&hostdata->lock, flags);
1206 }
1207 break;
1208
1209/* Note: this interrupt will occur only after a LEVEL2 command */
1210
1211 case CSR_SDP:
1212 DB(DB_INTR, printk("SDP"))
1213 hostdata->state = S_RUNNING_LEVEL2;
1214 write_wd33c93(regs, WD_COMMAND_PHASE, 0x41);
1215 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1216 spin_unlock_irqrestore(&hostdata->lock, flags);
1217 break;
1218
1219 case CSR_XFER_DONE | PHS_MESS_OUT:
1220 case CSR_UNEXP | PHS_MESS_OUT:
1221 case CSR_SRV_REQ | PHS_MESS_OUT:
1222 DB(DB_INTR, printk("MSG_OUT="))
1223
1224/* To get here, we've probably requested MESSAGE_OUT and have
1225 * already put the correct bytes in outgoing_msg[] and filled
1226 * in outgoing_len. We simply send them out to the SCSI bus.
1227 * Sometimes we get MESSAGE_OUT phase when we're not expecting
1228 * it - like when our SDTR message is rejected by a target. Some
1229 * targets send the REJECT before receiving all of the extended
1230 * message, and then seem to go back to MESSAGE_OUT for a byte
1231 * or two. Not sure why, or if I'm doing something wrong to
1232 * cause this to happen. Regardless, it seems that sending
1233 * NOP messages in these situations results in no harm and
1234 * makes everyone happy.
1235 */
1236 if (hostdata->outgoing_len == 0) {
1237 hostdata->outgoing_len = 1;
1238 hostdata->outgoing_msg[0] = NOP;
1239 }
1240 transfer_pio(regs, hostdata->outgoing_msg,
1241 hostdata->outgoing_len, DATA_OUT_DIR, hostdata);
1242 DB(DB_INTR, printk("%02x", hostdata->outgoing_msg[0]))
1243 hostdata->outgoing_len = 0;
1244 hostdata->state = S_CONNECTED;
1245 spin_unlock_irqrestore(&hostdata->lock, flags);
1246 break;
1247
1248 case CSR_UNEXP_DISC:
1249
1250/* I think I've seen this after a request-sense that was in response
1251 * to an error condition, but not sure. We certainly need to do
1252 * something when we get this interrupt - the question is 'what?'.
1253 * Let's think positively, and assume some command has finished
1254 * in a legal manner (like a command that provokes a request-sense),
1255 * so we treat it as a normal command-complete-disconnect.
1256 */
1257
1258/* Make sure that reselection is enabled at this point - it may
1259 * have been turned off for the command that just completed.
1260 */
1261
1262 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1263 if (cmd == NULL) {
1264 printk(" - Already disconnected! ");
1265 hostdata->state = S_UNCONNECTED;
1266 spin_unlock_irqrestore(&hostdata->lock, flags);
1267 return;
1268 }
1269 DB(DB_INTR, printk("UNEXP_DISC-%ld", cmd->pid))
1270 hostdata->connected = NULL;
1271 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1272 hostdata->state = S_UNCONNECTED;
1273 if (cmd->cmnd[0] == REQUEST_SENSE && cmd->SCp.Status != GOOD)
1274 cmd->result =
1275 (cmd->result & 0x00ffff) | (DID_ERROR << 16);
1276 else
1277 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
1278 cmd->scsi_done(cmd);
1279
1280/* We are no longer connected to a target - check to see if
1281 * there are commands waiting to be executed.
1282 */
1283 /* look above for comments on scsi_done() */
1284 spin_unlock_irqrestore(&hostdata->lock, flags);
1285 wd33c93_execute(instance);
1286 break;
1287
1288 case CSR_DISC:
1289
1290/* Make sure that reselection is enabled at this point - it may
1291 * have been turned off for the command that just completed.
1292 */
1293
1294 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1295 DB(DB_INTR, printk("DISC-%ld", cmd->pid))
1296 if (cmd == NULL) {
1297 printk(" - Already disconnected! ");
1298 hostdata->state = S_UNCONNECTED;
1299 }
1300 switch (hostdata->state) {
1301 case S_PRE_CMP_DISC:
1302 hostdata->connected = NULL;
1303 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1304 hostdata->state = S_UNCONNECTED;
1305 DB(DB_INTR, printk(":%d", cmd->SCp.Status))
1306 if (cmd->cmnd[0] == REQUEST_SENSE
1307 && cmd->SCp.Status != GOOD)
1308 cmd->result =
1309 (cmd->
1310 result & 0x00ffff) | (DID_ERROR << 16);
1311 else
1312 cmd->result =
1313 cmd->SCp.Status | (cmd->SCp.Message << 8);
1314 cmd->scsi_done(cmd);
1315 break;
1316 case S_PRE_TMP_DISC:
1317 case S_RUNNING_LEVEL2:
1318 cmd->host_scribble = (uchar *) hostdata->disconnected_Q;
1319 hostdata->disconnected_Q = cmd;
1320 hostdata->connected = NULL;
1321 hostdata->state = S_UNCONNECTED;
1322
1323#ifdef PROC_STATISTICS
1324 hostdata->disc_done_cnt[cmd->device->id]++;
1325#endif
1326
1327 break;
1328 default:
1329 printk("*** Unexpected DISCONNECT interrupt! ***");
1330 hostdata->state = S_UNCONNECTED;
1331 }
1332
1333/* We are no longer connected to a target - check to see if
1334 * there are commands waiting to be executed.
1335 */
1336 spin_unlock_irqrestore(&hostdata->lock, flags);
1337 wd33c93_execute(instance);
1338 break;
1339
1340 case CSR_RESEL_AM:
1341 case CSR_RESEL:
1342 DB(DB_INTR, printk("RESEL%s", sr == CSR_RESEL_AM ? "_AM" : ""))
1343
1344 /* Old chips (pre -A ???) don't have advanced features and will
1345 * generate CSR_RESEL. In that case we have to extract the LUN the
1346 * hard way (see below).
1347 * First we have to make sure this reselection didn't
1348 * happen during Arbitration/Selection of some other device.
1349 * If yes, put losing command back on top of input_Q.
1350 */
1351 if (hostdata->level2 <= L2_NONE) {
1352
1353 if (hostdata->selecting) {
1354 cmd = (struct scsi_cmnd *) hostdata->selecting;
1355 hostdata->selecting = NULL;
1356 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1357 cmd->host_scribble =
1358 (uchar *) hostdata->input_Q;
1359 hostdata->input_Q = cmd;
1360 }
1361 }
1362
1363 else {
1364
1365 if (cmd) {
1366 if (phs == 0x00) {
1367 hostdata->busy[cmd->device->id] &=
1368 ~(1 << cmd->device->lun);
1369 cmd->host_scribble =
1370 (uchar *) hostdata->input_Q;
1371 hostdata->input_Q = cmd;
1372 } else {
1373 printk
1374 ("---%02x:%02x:%02x-TROUBLE: Intrusive ReSelect!---",
1375 asr, sr, phs);
1376 while (1)
1377 printk("\r");
1378 }
1379 }
1380
1381 }
1382
1383 /* OK - find out which device reselected us. */
1384
1385 id = read_wd33c93(regs, WD_SOURCE_ID);
1386 id &= SRCID_MASK;
1387
1388 /* and extract the lun from the ID message. (Note that we don't
1389 * bother to check for a valid message here - I guess this is
1390 * not the right way to go, but...)
1391 */
1392
1393 if (sr == CSR_RESEL_AM) {
1394 lun = read_wd33c93(regs, WD_DATA);
1395 if (hostdata->level2 < L2_RESELECT)
1396 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1397 lun &= 7;
1398 } else {
1399 /* Old chip; wait for msgin phase to pick up the LUN. */
1400 for (lun = 255; lun; lun--) {
1401 if ((asr = read_aux_stat(regs)) & ASR_INT)
1402 break;
1403 udelay(10);
1404 }
1405 if (!(asr & ASR_INT)) {
1406 printk
1407 ("wd33c93: Reselected without IDENTIFY\n");
1408 lun = 0;
1409 } else {
1410 /* Verify this is a change to MSG_IN and read the message */
1411 sr = read_wd33c93(regs, WD_SCSI_STATUS);
Roman Zippel882905c2006-06-23 02:04:57 -07001412 udelay(7);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 if (sr == (CSR_ABORT | PHS_MESS_IN) ||
1414 sr == (CSR_UNEXP | PHS_MESS_IN) ||
1415 sr == (CSR_SRV_REQ | PHS_MESS_IN)) {
1416 /* Got MSG_IN, grab target LUN */
1417 lun = read_1_byte(regs);
1418 /* Now we expect a 'paused with ACK asserted' int.. */
1419 asr = read_aux_stat(regs);
1420 if (!(asr & ASR_INT)) {
1421 udelay(10);
1422 asr = read_aux_stat(regs);
1423 if (!(asr & ASR_INT))
1424 printk
1425 ("wd33c93: No int after LUN on RESEL (%02x)\n",
1426 asr);
1427 }
1428 sr = read_wd33c93(regs, WD_SCSI_STATUS);
Roman Zippel882905c2006-06-23 02:04:57 -07001429 udelay(7);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430 if (sr != CSR_MSGIN)
1431 printk
1432 ("wd33c93: Not paused with ACK on RESEL (%02x)\n",
1433 sr);
1434 lun &= 7;
1435 write_wd33c93_cmd(regs,
1436 WD_CMD_NEGATE_ACK);
1437 } else {
1438 printk
1439 ("wd33c93: Not MSG_IN on reselect (%02x)\n",
1440 sr);
1441 lun = 0;
1442 }
1443 }
1444 }
1445
1446 /* Now we look for the command that's reconnecting. */
1447
1448 cmd = (struct scsi_cmnd *) hostdata->disconnected_Q;
1449 patch = NULL;
1450 while (cmd) {
1451 if (id == cmd->device->id && lun == cmd->device->lun)
1452 break;
1453 patch = cmd;
1454 cmd = (struct scsi_cmnd *) cmd->host_scribble;
1455 }
1456
1457 /* Hmm. Couldn't find a valid command.... What to do? */
1458
1459 if (!cmd) {
1460 printk
1461 ("---TROUBLE: target %d.%d not in disconnect queue---",
1462 id, lun);
1463 spin_unlock_irqrestore(&hostdata->lock, flags);
1464 return;
1465 }
1466
1467 /* Ok, found the command - now start it up again. */
1468
1469 if (patch)
1470 patch->host_scribble = cmd->host_scribble;
1471 else
1472 hostdata->disconnected_Q =
1473 (struct scsi_cmnd *) cmd->host_scribble;
1474 hostdata->connected = cmd;
1475
1476 /* We don't need to worry about 'initialize_SCp()' or 'hostdata->busy[]'
1477 * because these things are preserved over a disconnect.
1478 * But we DO need to fix the DPD bit so it's correct for this command.
1479 */
1480
1481 if (cmd->sc_data_direction == DMA_TO_DEVICE)
1482 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);
1483 else
1484 write_wd33c93(regs, WD_DESTINATION_ID,
1485 cmd->device->id | DSTID_DPD);
1486 if (hostdata->level2 >= L2_RESELECT) {
1487 write_wd33c93_count(regs, 0); /* we want a DATA_PHASE interrupt */
1488 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
1489 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1490 hostdata->state = S_RUNNING_LEVEL2;
1491 } else
1492 hostdata->state = S_CONNECTED;
1493
1494 DB(DB_INTR, printk("-%ld", cmd->pid))
1495 spin_unlock_irqrestore(&hostdata->lock, flags);
1496 break;
1497
1498 default:
1499 printk("--UNKNOWN INTERRUPT:%02x:%02x:%02x--", asr, sr, phs);
1500 spin_unlock_irqrestore(&hostdata->lock, flags);
1501 }
1502
1503 DB(DB_INTR, printk("} "))
1504
1505}
1506
1507static void
1508reset_wd33c93(struct Scsi_Host *instance)
1509{
1510 struct WD33C93_hostdata *hostdata =
1511 (struct WD33C93_hostdata *) instance->hostdata;
1512 const wd33c93_regs regs = hostdata->regs;
1513 uchar sr;
1514
1515#ifdef CONFIG_SGI_IP22
1516 {
1517 int busycount = 0;
1518 extern void sgiwd93_reset(unsigned long);
1519 /* wait 'til the chip gets some time for us */
1520 while ((read_aux_stat(regs) & ASR_BSY) && busycount++ < 100)
1521 udelay (10);
1522 /*
1523 * there are scsi devices out there, which manage to lock up
1524 * the wd33c93 in a busy condition. In this state it won't
1525 * accept the reset command. The only way to solve this is to
1526 * give the chip a hardware reset (if possible). The code below
1527 * does this for the SGI Indy, where this is possible
1528 */
1529 /* still busy ? */
1530 if (read_aux_stat(regs) & ASR_BSY)
1531 sgiwd93_reset(instance->base); /* yeah, give it the hard one */
1532 }
1533#endif
1534
1535 write_wd33c93(regs, WD_OWN_ID, OWNID_EAF | OWNID_RAF |
1536 instance->this_id | hostdata->clock_freq);
1537 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1538 write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
1539 calc_sync_xfer(hostdata->default_sx_per / 4,
peter fuersta5d84212007-02-12 15:20:15 +01001540 DEFAULT_SX_OFF, 0, hostdata->sx_table));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541 write_wd33c93(regs, WD_COMMAND, WD_CMD_RESET);
1542
1543
1544#ifdef CONFIG_MVME147_SCSI
1545 udelay(25); /* The old wd33c93 on MVME147 needs this, at least */
1546#endif
1547
1548 while (!(read_aux_stat(regs) & ASR_INT))
1549 ;
1550 sr = read_wd33c93(regs, WD_SCSI_STATUS);
1551
1552 hostdata->microcode = read_wd33c93(regs, WD_CDB_1);
1553 if (sr == 0x00)
1554 hostdata->chip = C_WD33C93;
1555 else if (sr == 0x01) {
1556 write_wd33c93(regs, WD_QUEUE_TAG, 0xa5); /* any random number */
1557 sr = read_wd33c93(regs, WD_QUEUE_TAG);
1558 if (sr == 0xa5) {
1559 hostdata->chip = C_WD33C93B;
1560 write_wd33c93(regs, WD_QUEUE_TAG, 0);
1561 } else
1562 hostdata->chip = C_WD33C93A;
1563 } else
1564 hostdata->chip = C_UNKNOWN_CHIP;
1565
peter fuersta5d84212007-02-12 15:20:15 +01001566 if (hostdata->chip != C_WD33C93B) /* Fast SCSI unavailable */
1567 hostdata->fast = 0;
1568
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 write_wd33c93(regs, WD_TIMEOUT_PERIOD, TIMEOUT_PERIOD_VALUE);
1570 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1571}
1572
1573int
1574wd33c93_host_reset(struct scsi_cmnd * SCpnt)
1575{
1576 struct Scsi_Host *instance;
1577 struct WD33C93_hostdata *hostdata;
1578 int i;
1579
1580 instance = SCpnt->device->host;
1581 hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1582
1583 printk("scsi%d: reset. ", instance->host_no);
1584 disable_irq(instance->irq);
1585
1586 hostdata->dma_stop(instance, NULL, 0);
1587 for (i = 0; i < 8; i++) {
1588 hostdata->busy[i] = 0;
1589 hostdata->sync_xfer[i] =
peter fuersta5d84212007-02-12 15:20:15 +01001590 calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF,
1591 0, hostdata->sx_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592 hostdata->sync_stat[i] = SS_UNSET; /* using default sync values */
1593 }
1594 hostdata->input_Q = NULL;
1595 hostdata->selecting = NULL;
1596 hostdata->connected = NULL;
1597 hostdata->disconnected_Q = NULL;
1598 hostdata->state = S_UNCONNECTED;
1599 hostdata->dma = D_DMA_OFF;
1600 hostdata->incoming_ptr = 0;
1601 hostdata->outgoing_len = 0;
1602
1603 reset_wd33c93(instance);
1604 SCpnt->result = DID_RESET << 16;
1605 enable_irq(instance->irq);
1606 return SUCCESS;
1607}
1608
1609int
1610wd33c93_abort(struct scsi_cmnd * cmd)
1611{
1612 struct Scsi_Host *instance;
1613 struct WD33C93_hostdata *hostdata;
1614 wd33c93_regs regs;
1615 struct scsi_cmnd *tmp, *prev;
1616
1617 disable_irq(cmd->device->host->irq);
1618
1619 instance = cmd->device->host;
1620 hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1621 regs = hostdata->regs;
1622
1623/*
1624 * Case 1 : If the command hasn't been issued yet, we simply remove it
1625 * from the input_Q.
1626 */
1627
1628 tmp = (struct scsi_cmnd *) hostdata->input_Q;
Al Viroa5d361f2006-01-12 01:06:34 -08001629 prev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630 while (tmp) {
1631 if (tmp == cmd) {
1632 if (prev)
1633 prev->host_scribble = cmd->host_scribble;
1634 else
1635 hostdata->input_Q =
1636 (struct scsi_cmnd *) cmd->host_scribble;
1637 cmd->host_scribble = NULL;
1638 cmd->result = DID_ABORT << 16;
1639 printk
1640 ("scsi%d: Abort - removing command %ld from input_Q. ",
1641 instance->host_no, cmd->pid);
1642 enable_irq(cmd->device->host->irq);
1643 cmd->scsi_done(cmd);
1644 return SUCCESS;
1645 }
1646 prev = tmp;
1647 tmp = (struct scsi_cmnd *) tmp->host_scribble;
1648 }
1649
1650/*
1651 * Case 2 : If the command is connected, we're going to fail the abort
1652 * and let the high level SCSI driver retry at a later time or
1653 * issue a reset.
1654 *
1655 * Timeouts, and therefore aborted commands, will be highly unlikely
1656 * and handling them cleanly in this situation would make the common
1657 * case of noresets less efficient, and would pollute our code. So,
1658 * we fail.
1659 */
1660
1661 if (hostdata->connected == cmd) {
1662 uchar sr, asr;
1663 unsigned long timeout;
1664
1665 printk("scsi%d: Aborting connected command %ld - ",
1666 instance->host_no, cmd->pid);
1667
1668 printk("stopping DMA - ");
1669 if (hostdata->dma == D_DMA_RUNNING) {
1670 hostdata->dma_stop(instance, cmd, 0);
1671 hostdata->dma = D_DMA_OFF;
1672 }
1673
1674 printk("sending wd33c93 ABORT command - ");
1675 write_wd33c93(regs, WD_CONTROL,
1676 CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1677 write_wd33c93_cmd(regs, WD_CMD_ABORT);
1678
1679/* Now we have to attempt to flush out the FIFO... */
1680
1681 printk("flushing fifo - ");
1682 timeout = 1000000;
1683 do {
1684 asr = read_aux_stat(regs);
1685 if (asr & ASR_DBR)
1686 read_wd33c93(regs, WD_DATA);
1687 } while (!(asr & ASR_INT) && timeout-- > 0);
1688 sr = read_wd33c93(regs, WD_SCSI_STATUS);
1689 printk
1690 ("asr=%02x, sr=%02x, %ld bytes un-transferred (timeout=%ld) - ",
1691 asr, sr, read_wd33c93_count(regs), timeout);
1692
1693 /*
1694 * Abort command processed.
1695 * Still connected.
1696 * We must disconnect.
1697 */
1698
1699 printk("sending wd33c93 DISCONNECT command - ");
1700 write_wd33c93_cmd(regs, WD_CMD_DISCONNECT);
1701
1702 timeout = 1000000;
1703 asr = read_aux_stat(regs);
1704 while ((asr & ASR_CIP) && timeout-- > 0)
1705 asr = read_aux_stat(regs);
1706 sr = read_wd33c93(regs, WD_SCSI_STATUS);
1707 printk("asr=%02x, sr=%02x.", asr, sr);
1708
1709 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1710 hostdata->connected = NULL;
1711 hostdata->state = S_UNCONNECTED;
1712 cmd->result = DID_ABORT << 16;
1713
1714/* sti();*/
1715 wd33c93_execute(instance);
1716
1717 enable_irq(cmd->device->host->irq);
1718 cmd->scsi_done(cmd);
1719 return SUCCESS;
1720 }
1721
1722/*
1723 * Case 3: If the command is currently disconnected from the bus,
1724 * we're not going to expend much effort here: Let's just return
1725 * an ABORT_SNOOZE and hope for the best...
1726 */
1727
1728 tmp = (struct scsi_cmnd *) hostdata->disconnected_Q;
1729 while (tmp) {
1730 if (tmp == cmd) {
1731 printk
1732 ("scsi%d: Abort - command %ld found on disconnected_Q - ",
1733 instance->host_no, cmd->pid);
1734 printk("Abort SNOOZE. ");
1735 enable_irq(cmd->device->host->irq);
1736 return FAILED;
1737 }
1738 tmp = (struct scsi_cmnd *) tmp->host_scribble;
1739 }
1740
1741/*
1742 * Case 4 : If we reached this point, the command was not found in any of
1743 * the queues.
1744 *
1745 * We probably reached this point because of an unlikely race condition
1746 * between the command completing successfully and the abortion code,
1747 * so we won't panic, but we will notify the user in case something really
1748 * broke.
1749 */
1750
1751/* sti();*/
1752 wd33c93_execute(instance);
1753
1754 enable_irq(cmd->device->host->irq);
1755 printk("scsi%d: warning : SCSI command probably completed successfully"
1756 " before abortion. ", instance->host_no);
1757 return FAILED;
1758}
1759
1760#define MAX_WD33C93_HOSTS 4
Tobias Klauser6391a112006-06-08 22:23:48 -07001761#define MAX_SETUP_ARGS ARRAY_SIZE(setup_args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001762#define SETUP_BUFFER_SIZE 200
1763static char setup_buffer[SETUP_BUFFER_SIZE];
1764static char setup_used[MAX_SETUP_ARGS];
1765static int done_setup = 0;
1766
Adrian Bunk078dda92007-07-09 12:00:01 -07001767static int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768wd33c93_setup(char *str)
1769{
1770 int i;
1771 char *p1, *p2;
1772
1773 /* The kernel does some processing of the command-line before calling
1774 * this function: If it begins with any decimal or hex number arguments,
1775 * ints[0] = how many numbers found and ints[1] through [n] are the values
1776 * themselves. str points to where the non-numeric arguments (if any)
1777 * start: We do our own parsing of those. We construct synthetic 'nosync'
1778 * keywords out of numeric args (to maintain compatibility with older
1779 * versions) and then add the rest of the arguments.
1780 */
1781
1782 p1 = setup_buffer;
1783 *p1 = '\0';
1784 if (str)
1785 strncpy(p1, str, SETUP_BUFFER_SIZE - strlen(setup_buffer));
1786 setup_buffer[SETUP_BUFFER_SIZE - 1] = '\0';
1787 p1 = setup_buffer;
1788 i = 0;
1789 while (*p1 && (i < MAX_SETUP_ARGS)) {
1790 p2 = strchr(p1, ',');
1791 if (p2) {
1792 *p2 = '\0';
1793 if (p1 != p2)
1794 setup_args[i] = p1;
1795 p1 = p2 + 1;
1796 i++;
1797 } else {
1798 setup_args[i] = p1;
1799 break;
1800 }
1801 }
1802 for (i = 0; i < MAX_SETUP_ARGS; i++)
1803 setup_used[i] = 0;
1804 done_setup = 1;
1805
1806 return 1;
1807}
1808__setup("wd33c93=", wd33c93_setup);
1809
1810/* check_setup_args() returns index if key found, 0 if not
1811 */
1812static int
1813check_setup_args(char *key, int *flags, int *val, char *buf)
1814{
1815 int x;
1816 char *cp;
1817
1818 for (x = 0; x < MAX_SETUP_ARGS; x++) {
1819 if (setup_used[x])
1820 continue;
1821 if (!strncmp(setup_args[x], key, strlen(key)))
1822 break;
1823 if (!strncmp(setup_args[x], "next", strlen("next")))
1824 return 0;
1825 }
1826 if (x == MAX_SETUP_ARGS)
1827 return 0;
1828 setup_used[x] = 1;
1829 cp = setup_args[x] + strlen(key);
1830 *val = -1;
1831 if (*cp != ':')
1832 return ++x;
1833 cp++;
1834 if ((*cp >= '0') && (*cp <= '9')) {
1835 *val = simple_strtoul(cp, NULL, 0);
1836 }
1837 return ++x;
1838}
1839
peter fuersta5d84212007-02-12 15:20:15 +01001840/*
1841 * Calculate internal data-transfer-clock cycle from input-clock
1842 * frequency (/MHz) and fill 'sx_table'.
1843 *
1844 * The original driver used to rely on a fixed sx_table, containing periods
1845 * for (only) the lower limits of the respective input-clock-frequency ranges
1846 * (8-10/12-15/16-20 MHz). Although it seems, that no problems ocurred with
1847 * this setting so far, it might be desirable to adjust the transfer periods
1848 * closer to the really attached, possibly 25% higher, input-clock, since
1849 * - the wd33c93 may really use a significant shorter period, than it has
1850 * negotiated (eg. thrashing the target, which expects 4/8MHz, with 5/10MHz
1851 * instead).
1852 * - the wd33c93 may ask the target for a lower transfer rate, than the target
1853 * is capable of (eg. negotiating for an assumed minimum of 252ns instead of
1854 * possible 200ns, which indeed shows up in tests as an approx. 10% lower
1855 * transfer rate).
1856 */
1857static inline unsigned int
1858round_4(unsigned int x)
1859{
1860 switch (x & 3) {
1861 case 1: --x;
1862 break;
1863 case 2: ++x;
1864 case 3: ++x;
1865 }
1866 return x;
1867}
1868
1869static void
1870calc_sx_table(unsigned int mhz, struct sx_period sx_table[9])
1871{
1872 unsigned int d, i;
1873 if (mhz < 11)
1874 d = 2; /* divisor for 8-10 MHz input-clock */
1875 else if (mhz < 16)
1876 d = 3; /* divisor for 12-15 MHz input-clock */
1877 else
1878 d = 4; /* divisor for 16-20 MHz input-clock */
1879
1880 d = (100000 * d) / 2 / mhz; /* 100 x DTCC / nanosec */
1881
1882 sx_table[0].period_ns = 1;
1883 sx_table[0].reg_value = 0x20;
1884 for (i = 1; i < 8; i++) {
1885 sx_table[i].period_ns = round_4((i+1)*d / 100);
1886 sx_table[i].reg_value = (i+1)*0x10;
1887 }
1888 sx_table[7].reg_value = 0;
1889 sx_table[8].period_ns = 0;
1890 sx_table[8].reg_value = 0;
1891}
1892
1893/*
1894 * check and, maybe, map an init- or "clock:"- argument.
1895 */
1896static uchar
1897set_clk_freq(int freq, int *mhz)
1898{
1899 int x = freq;
1900 if (WD33C93_FS_8_10 == freq)
1901 freq = 8;
1902 else if (WD33C93_FS_12_15 == freq)
1903 freq = 12;
1904 else if (WD33C93_FS_16_20 == freq)
1905 freq = 16;
1906 else if (freq > 7 && freq < 11)
1907 x = WD33C93_FS_8_10;
1908 else if (freq > 11 && freq < 16)
1909 x = WD33C93_FS_12_15;
1910 else if (freq > 15 && freq < 21)
1911 x = WD33C93_FS_16_20;
1912 else {
1913 /* Hmm, wouldn't it be safer to assume highest freq here? */
1914 x = WD33C93_FS_8_10;
1915 freq = 8;
1916 }
1917 *mhz = freq;
1918 return x;
1919}
1920
1921/*
1922 * to be used with the resync: fast: ... options
1923 */
1924static inline void set_resync ( struct WD33C93_hostdata *hd, int mask )
1925{
1926 int i;
1927 for (i = 0; i < 8; i++)
1928 if (mask & (1 << i))
1929 hd->sync_stat[i] = SS_UNSET;
1930}
1931
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932void
1933wd33c93_init(struct Scsi_Host *instance, const wd33c93_regs regs,
1934 dma_setup_t setup, dma_stop_t stop, int clock_freq)
1935{
1936 struct WD33C93_hostdata *hostdata;
1937 int i;
1938 int flags;
1939 int val;
1940 char buf[32];
1941
1942 if (!done_setup && setup_strings)
1943 wd33c93_setup(setup_strings);
1944
1945 hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1946
1947 hostdata->regs = regs;
peter fuersta5d84212007-02-12 15:20:15 +01001948 hostdata->clock_freq = set_clk_freq(clock_freq, &i);
1949 calc_sx_table(i, hostdata->sx_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001950 hostdata->dma_setup = setup;
1951 hostdata->dma_stop = stop;
1952 hostdata->dma_bounce_buffer = NULL;
1953 hostdata->dma_bounce_len = 0;
1954 for (i = 0; i < 8; i++) {
1955 hostdata->busy[i] = 0;
1956 hostdata->sync_xfer[i] =
peter fuersta5d84212007-02-12 15:20:15 +01001957 calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF,
1958 0, hostdata->sx_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959 hostdata->sync_stat[i] = SS_UNSET; /* using default sync values */
1960#ifdef PROC_STATISTICS
1961 hostdata->cmd_cnt[i] = 0;
1962 hostdata->disc_allowed_cnt[i] = 0;
1963 hostdata->disc_done_cnt[i] = 0;
1964#endif
1965 }
1966 hostdata->input_Q = NULL;
1967 hostdata->selecting = NULL;
1968 hostdata->connected = NULL;
1969 hostdata->disconnected_Q = NULL;
1970 hostdata->state = S_UNCONNECTED;
1971 hostdata->dma = D_DMA_OFF;
1972 hostdata->level2 = L2_BASIC;
1973 hostdata->disconnect = DIS_ADAPTIVE;
1974 hostdata->args = DEBUG_DEFAULTS;
1975 hostdata->incoming_ptr = 0;
1976 hostdata->outgoing_len = 0;
1977 hostdata->default_sx_per = DEFAULT_SX_PER;
1978 hostdata->no_sync = 0xff; /* sync defaults to off */
1979 hostdata->no_dma = 0; /* default is DMA enabled */
peter fuersta5d84212007-02-12 15:20:15 +01001980 hostdata->fast = 0; /* default is Fast SCSI transfers disabled */
1981 hostdata->dma_mode = CTRL_DMA; /* default is Single Byte DMA */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982
1983#ifdef PROC_INTERFACE
1984 hostdata->proc = PR_VERSION | PR_INFO | PR_STATISTICS |
1985 PR_CONNECTED | PR_INPUTQ | PR_DISCQ | PR_STOP;
1986#ifdef PROC_STATISTICS
1987 hostdata->dma_cnt = 0;
1988 hostdata->pio_cnt = 0;
1989 hostdata->int_cnt = 0;
1990#endif
1991#endif
1992
peter fuersta5d84212007-02-12 15:20:15 +01001993 if (check_setup_args("clock", &flags, &val, buf)) {
1994 hostdata->clock_freq = set_clk_freq(val, &val);
1995 calc_sx_table(val, hostdata->sx_table);
1996 }
1997
Linus Torvalds1da177e2005-04-16 15:20:36 -07001998 if (check_setup_args("nosync", &flags, &val, buf))
1999 hostdata->no_sync = val;
2000
2001 if (check_setup_args("nodma", &flags, &val, buf))
2002 hostdata->no_dma = (val == -1) ? 1 : val;
2003
2004 if (check_setup_args("period", &flags, &val, buf))
2005 hostdata->default_sx_per =
peter fuersta5d84212007-02-12 15:20:15 +01002006 hostdata->sx_table[round_period((unsigned int) val,
2007 hostdata->sx_table)].period_ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002008
2009 if (check_setup_args("disconnect", &flags, &val, buf)) {
2010 if ((val >= DIS_NEVER) && (val <= DIS_ALWAYS))
2011 hostdata->disconnect = val;
2012 else
2013 hostdata->disconnect = DIS_ADAPTIVE;
2014 }
2015
2016 if (check_setup_args("level2", &flags, &val, buf))
2017 hostdata->level2 = val;
2018
2019 if (check_setup_args("debug", &flags, &val, buf))
2020 hostdata->args = val & DB_MASK;
2021
peter fuersta5d84212007-02-12 15:20:15 +01002022 if (check_setup_args("burst", &flags, &val, buf))
2023 hostdata->dma_mode = val ? CTRL_BURST:CTRL_DMA;
2024
2025 if (WD33C93_FS_16_20 == hostdata->clock_freq /* divisor 4 */
2026 && check_setup_args("fast", &flags, &val, buf))
2027 hostdata->fast = !!val;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002028
2029 if ((i = check_setup_args("next", &flags, &val, buf))) {
2030 while (i)
2031 setup_used[--i] = 1;
2032 }
2033#ifdef PROC_INTERFACE
2034 if (check_setup_args("proc", &flags, &val, buf))
2035 hostdata->proc = val;
2036#endif
2037
2038 spin_lock_irq(&hostdata->lock);
2039 reset_wd33c93(instance);
2040 spin_unlock_irq(&hostdata->lock);
2041
2042 printk("wd33c93-%d: chip=%s/%d no_sync=0x%x no_dma=%d",
2043 instance->host_no,
2044 (hostdata->chip == C_WD33C93) ? "WD33c93" : (hostdata->chip ==
2045 C_WD33C93A) ?
2046 "WD33c93A" : (hostdata->chip ==
2047 C_WD33C93B) ? "WD33c93B" : "unknown",
2048 hostdata->microcode, hostdata->no_sync, hostdata->no_dma);
2049#ifdef DEBUGGING_ON
2050 printk(" debug_flags=0x%02x\n", hostdata->args);
2051#else
2052 printk(" debugging=OFF\n");
2053#endif
2054 printk(" setup_args=");
2055 for (i = 0; i < MAX_SETUP_ARGS; i++)
2056 printk("%s,", setup_args[i]);
2057 printk("\n");
2058 printk(" Version %s - %s, Compiled %s at %s\n",
2059 WD33C93_VERSION, WD33C93_DATE, __DATE__, __TIME__);
2060}
2061
2062int
2063wd33c93_proc_info(struct Scsi_Host *instance, char *buf, char **start, off_t off, int len, int in)
2064{
2065
2066#ifdef PROC_INTERFACE
2067
2068 char *bp;
2069 char tbuf[128];
2070 struct WD33C93_hostdata *hd;
2071 struct scsi_cmnd *cmd;
peter fuersta5d84212007-02-12 15:20:15 +01002072 int x;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002073 static int stop = 0;
2074
2075 hd = (struct WD33C93_hostdata *) instance->hostdata;
2076
2077/* If 'in' is TRUE we need to _read_ the proc file. We accept the following
peter fuersta5d84212007-02-12 15:20:15 +01002078 * keywords (same format as command-line, but arguments are not optional):
Linus Torvalds1da177e2005-04-16 15:20:36 -07002079 * debug
2080 * disconnect
2081 * period
2082 * resync
2083 * proc
2084 * nodma
peter fuersta5d84212007-02-12 15:20:15 +01002085 * level2
2086 * burst
2087 * fast
2088 * nosync
Linus Torvalds1da177e2005-04-16 15:20:36 -07002089 */
2090
2091 if (in) {
2092 buf[len] = '\0';
peter fuersta5d84212007-02-12 15:20:15 +01002093 for (bp = buf; *bp; ) {
2094 while (',' == *bp || ' ' == *bp)
2095 ++bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002096 if (!strncmp(bp, "debug:", 6)) {
peter fuersta5d84212007-02-12 15:20:15 +01002097 hd->args = simple_strtoul(bp+6, &bp, 0) & DB_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002098 } else if (!strncmp(bp, "disconnect:", 11)) {
peter fuersta5d84212007-02-12 15:20:15 +01002099 x = simple_strtoul(bp+11, &bp, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002100 if (x < DIS_NEVER || x > DIS_ALWAYS)
2101 x = DIS_ADAPTIVE;
2102 hd->disconnect = x;
2103 } else if (!strncmp(bp, "period:", 7)) {
peter fuersta5d84212007-02-12 15:20:15 +01002104 x = simple_strtoul(bp+7, &bp, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105 hd->default_sx_per =
peter fuersta5d84212007-02-12 15:20:15 +01002106 hd->sx_table[round_period((unsigned int) x,
2107 hd->sx_table)].period_ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002108 } else if (!strncmp(bp, "resync:", 7)) {
peter fuersta5d84212007-02-12 15:20:15 +01002109 set_resync(hd, (int)simple_strtoul(bp+7, &bp, 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002110 } else if (!strncmp(bp, "proc:", 5)) {
peter fuersta5d84212007-02-12 15:20:15 +01002111 hd->proc = simple_strtoul(bp+5, &bp, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002112 } else if (!strncmp(bp, "nodma:", 6)) {
peter fuersta5d84212007-02-12 15:20:15 +01002113 hd->no_dma = simple_strtoul(bp+6, &bp, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002114 } else if (!strncmp(bp, "level2:", 7)) {
peter fuersta5d84212007-02-12 15:20:15 +01002115 hd->level2 = simple_strtoul(bp+7, &bp, 0);
2116 } else if (!strncmp(bp, "burst:", 6)) {
2117 hd->dma_mode =
2118 simple_strtol(bp+6, &bp, 0) ? CTRL_BURST:CTRL_DMA;
2119 } else if (!strncmp(bp, "fast:", 5)) {
2120 x = !!simple_strtol(bp+5, &bp, 0);
2121 if (x != hd->fast)
2122 set_resync(hd, 0xff);
2123 hd->fast = x;
2124 } else if (!strncmp(bp, "nosync:", 7)) {
2125 x = simple_strtoul(bp+7, &bp, 0);
2126 set_resync(hd, x ^ hd->no_sync);
2127 hd->no_sync = x;
2128 } else {
2129 break; /* unknown keyword,syntax-error,... */
2130 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002131 }
2132 return len;
2133 }
2134
2135 spin_lock_irq(&hd->lock);
2136 bp = buf;
2137 *bp = '\0';
2138 if (hd->proc & PR_VERSION) {
2139 sprintf(tbuf, "\nVersion %s - %s. Compiled %s %s",
2140 WD33C93_VERSION, WD33C93_DATE, __DATE__, __TIME__);
2141 strcat(bp, tbuf);
2142 }
2143 if (hd->proc & PR_INFO) {
peter fuersta5d84212007-02-12 15:20:15 +01002144 sprintf(tbuf, "\nclock_freq=%02x no_sync=%02x no_dma=%d"
2145 " dma_mode=%02x fast=%d",
2146 hd->clock_freq, hd->no_sync, hd->no_dma, hd->dma_mode, hd->fast);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002147 strcat(bp, tbuf);
2148 strcat(bp, "\nsync_xfer[] = ");
2149 for (x = 0; x < 7; x++) {
2150 sprintf(tbuf, "\t%02x", hd->sync_xfer[x]);
2151 strcat(bp, tbuf);
2152 }
2153 strcat(bp, "\nsync_stat[] = ");
2154 for (x = 0; x < 7; x++) {
2155 sprintf(tbuf, "\t%02x", hd->sync_stat[x]);
2156 strcat(bp, tbuf);
2157 }
2158 }
2159#ifdef PROC_STATISTICS
2160 if (hd->proc & PR_STATISTICS) {
2161 strcat(bp, "\ncommands issued: ");
2162 for (x = 0; x < 7; x++) {
2163 sprintf(tbuf, "\t%ld", hd->cmd_cnt[x]);
2164 strcat(bp, tbuf);
2165 }
2166 strcat(bp, "\ndisconnects allowed:");
2167 for (x = 0; x < 7; x++) {
2168 sprintf(tbuf, "\t%ld", hd->disc_allowed_cnt[x]);
2169 strcat(bp, tbuf);
2170 }
2171 strcat(bp, "\ndisconnects done: ");
2172 for (x = 0; x < 7; x++) {
2173 sprintf(tbuf, "\t%ld", hd->disc_done_cnt[x]);
2174 strcat(bp, tbuf);
2175 }
2176 sprintf(tbuf,
2177 "\ninterrupts: %ld, DATA_PHASE ints: %ld DMA, %ld PIO",
2178 hd->int_cnt, hd->dma_cnt, hd->pio_cnt);
2179 strcat(bp, tbuf);
2180 }
2181#endif
2182 if (hd->proc & PR_CONNECTED) {
2183 strcat(bp, "\nconnected: ");
2184 if (hd->connected) {
2185 cmd = (struct scsi_cmnd *) hd->connected;
2186 sprintf(tbuf, " %ld-%d:%d(%02x)",
2187 cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2188 strcat(bp, tbuf);
2189 }
2190 }
2191 if (hd->proc & PR_INPUTQ) {
2192 strcat(bp, "\ninput_Q: ");
2193 cmd = (struct scsi_cmnd *) hd->input_Q;
2194 while (cmd) {
2195 sprintf(tbuf, " %ld-%d:%d(%02x)",
2196 cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2197 strcat(bp, tbuf);
2198 cmd = (struct scsi_cmnd *) cmd->host_scribble;
2199 }
2200 }
2201 if (hd->proc & PR_DISCQ) {
2202 strcat(bp, "\ndisconnected_Q:");
2203 cmd = (struct scsi_cmnd *) hd->disconnected_Q;
2204 while (cmd) {
2205 sprintf(tbuf, " %ld-%d:%d(%02x)",
2206 cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2207 strcat(bp, tbuf);
2208 cmd = (struct scsi_cmnd *) cmd->host_scribble;
2209 }
2210 }
2211 strcat(bp, "\n");
2212 spin_unlock_irq(&hd->lock);
2213 *start = buf;
2214 if (stop) {
2215 stop = 0;
2216 return 0;
2217 }
2218 if (off > 0x40000) /* ALWAYS stop after 256k bytes have been read */
2219 stop = 1;
2220 if (hd->proc & PR_STOP) /* stop every other time */
2221 stop = 1;
2222 return strlen(bp);
2223
2224#else /* PROC_INTERFACE */
2225
2226 return 0;
2227
2228#endif /* PROC_INTERFACE */
2229
2230}
2231
2232void
2233wd33c93_release(void)
2234{
2235}
2236
2237EXPORT_SYMBOL(wd33c93_host_reset);
2238EXPORT_SYMBOL(wd33c93_init);
2239EXPORT_SYMBOL(wd33c93_release);
2240EXPORT_SYMBOL(wd33c93_abort);
2241EXPORT_SYMBOL(wd33c93_queuecommand);
2242EXPORT_SYMBOL(wd33c93_intr);
2243EXPORT_SYMBOL(wd33c93_proc_info);