Merge branch 'for-2.6.24' of master.kernel.org:/pub/scm/linux/kernel/git/jwboyer...
[linux-2.6] / drivers / scsi / wd33c93.c
1 /*
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
72  *
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
77  */
78
79 #include <linux/module.h>
80
81 #include <linux/string.h>
82 #include <linux/delay.h>
83 #include <linux/init.h>
84 #include <linux/interrupt.h>
85 #include <linux/blkdev.h>
86
87 #include <scsi/scsi.h>
88 #include <scsi/scsi_cmnd.h>
89 #include <scsi/scsi_device.h>
90 #include <scsi/scsi_host.h>
91
92 #include <asm/irq.h>
93
94 #include "wd33c93.h"
95
96 #define optimum_sx_per(hostdata) (hostdata)->sx_table[1].period_ns
97
98
99 #define WD33C93_VERSION    "1.26++"
100 #define WD33C93_DATE       "10/Feb/2007"
101
102 MODULE_AUTHOR("John Shifflett");
103 MODULE_DESCRIPTION("Generic WD33C93 SCSI driver");
104 MODULE_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.
134  * -  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".
141  * -  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 */
167 static char *setup_args[] = { "", "", "", "", "", "", "", "", "", "" };
168
169 static char *setup_strings;
170 module_param(setup_strings, charp, 0);
171
172 static void wd33c93_execute(struct Scsi_Host *instance);
173
174 #ifdef CONFIG_WD33C93_PIO
175 static inline uchar
176 read_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
185 static inline unsigned long
186 read_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
197 static inline uchar
198 read_aux_stat(const wd33c93_regs regs)
199 {
200         return inb(regs.SASR);
201 }
202
203 static inline void
204 write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value)
205 {
206       outb(reg_num, regs.SASR);
207       outb(value, regs.SCMD);
208 }
209
210 static inline void
211 write_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
222 static inline void
223 write_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 */
233 static inline uchar
234 read_wd33c93(const wd33c93_regs regs, uchar reg_num)
235 {
236         *regs.SASR = reg_num;
237         mb();
238         return (*regs.SCMD);
239 }
240
241 static unsigned long
242 read_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
255 static inline uchar
256 read_aux_stat(const wd33c93_regs regs)
257 {
258         return *regs.SASR;
259 }
260
261 static inline void
262 write_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
270 static void
271 write_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
281 static inline void
282 write_wd33c93_cmd(const wd33c93_regs regs, uchar cmd)
283 {
284         *regs.SASR = WD_COMMAND;
285         mb();
286         *regs.SCMD = cmd;
287         mb();
288 }
289
290 static inline void
291 write_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
301 static inline uchar
302 read_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
317 static int
318 round_period(unsigned int period, const struct sx_period *sx_table)
319 {
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
331 /*
332  * Calculate Synchronous Transfer Register value from SDTR code.
333  */
334 static uchar
335 calc_sync_xfer(unsigned int period, unsigned int offset, unsigned int fast,
336                const struct sx_period *sx_table)
337 {
338         /* When doing Fast SCSI synchronous data transfers, the corresponding
339          * value in 'sx_table' is two times the actually used transfer period.
340          */
341         uchar result;
342
343         if (offset && fast) {
344                 fast = STR_FSS;
345                 period *= 2;
346         } else {
347                 fast = 0;
348         }
349         period *= 4;            /* convert SDTR code to ns */
350         result = sx_table[round_period(period,sx_table)].reg_value;
351         result |= (offset < OPTIMUM_SX_OFF) ? offset : OPTIMUM_SX_OFF;
352         result |= fast;
353         return result;
354 }
355
356 /*
357  * Calculate SDTR code bytes [3],[4] from period and offset.
358  */
359 static inline void
360 calc_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
374 int
375 wd33c93_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->serial_number))
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) {
411                 cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer;
412                 cmd->SCp.buffers_residual = cmd->use_sg - 1;
413                 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
414                 cmd->SCp.this_residual = cmd->SCp.buffer->length;
415         } else {
416                 cmd->SCp.buffer = NULL;
417                 cmd->SCp.buffers_residual = 0;
418                 cmd->SCp.ptr = (char *) cmd->request_buffer;
419                 cmd->SCp.this_residual = cmd->request_bufflen;
420         }
421
422 /* WD docs state that at the conclusion of a "LEVEL2" command, the
423  * status byte can be retrieved from the LUN register. Apparently,
424  * this is the case only for *uninterrupted* LEVEL2 commands! If
425  * there are any unexpected phases entered, even if they are 100%
426  * legal (different devices may choose to do things differently),
427  * the LEVEL2 command sequence is exited. This often occurs prior
428  * to receiving the status byte, in which case the driver does a
429  * status phase interrupt and gets the status byte on its own.
430  * While such a command can then be "resumed" (ie restarted to
431  * finish up as a LEVEL2 command), the LUN register will NOT be
432  * a valid status byte at the command's conclusion, and we must
433  * use the byte obtained during the earlier interrupt. Here, we
434  * preset SCp.Status to an illegal value (0xff) so that when
435  * this command finally completes, we can tell where the actual
436  * status byte is stored.
437  */
438
439         cmd->SCp.Status = ILLEGAL_STATUS_BYTE;
440
441         /*
442          * Add the cmd to the end of 'input_Q'. Note that REQUEST SENSE
443          * commands are added to the head of the queue so that the desired
444          * sense data is not lost before REQUEST_SENSE executes.
445          */
446
447         spin_lock_irq(&hostdata->lock);
448
449         if (!(hostdata->input_Q) || (cmd->cmnd[0] == REQUEST_SENSE)) {
450                 cmd->host_scribble = (uchar *) hostdata->input_Q;
451                 hostdata->input_Q = cmd;
452         } else {                /* find the end of the queue */
453                 for (tmp = (struct scsi_cmnd *) hostdata->input_Q;
454                      tmp->host_scribble;
455                      tmp = (struct scsi_cmnd *) tmp->host_scribble) ;
456                 tmp->host_scribble = (uchar *) cmd;
457         }
458
459 /* We know that there's at least one command in 'input_Q' now.
460  * Go see if any of them are runnable!
461  */
462
463         wd33c93_execute(cmd->device->host);
464
465         DB(DB_QUEUE_COMMAND, printk(")Q-%ld ", cmd->serial_number))
466
467         spin_unlock_irq(&hostdata->lock);
468         return 0;
469 }
470
471 /*
472  * This routine attempts to start a scsi command. If the host_card is
473  * already connected, we give up immediately. Otherwise, look through
474  * the input_Q, using the first command we find that's intended
475  * for a currently non-busy target/lun.
476  *
477  * wd33c93_execute() is always called with interrupts disabled or from
478  * the wd33c93_intr itself, which means that a wd33c93 interrupt
479  * cannot occur while we are in here.
480  */
481 static void
482 wd33c93_execute(struct Scsi_Host *instance)
483 {
484         struct WD33C93_hostdata *hostdata =
485             (struct WD33C93_hostdata *) instance->hostdata;
486         const wd33c93_regs regs = hostdata->regs;
487         struct scsi_cmnd *cmd, *prev;
488
489         DB(DB_EXECUTE, printk("EX("))
490         if (hostdata->selecting || hostdata->connected) {
491                 DB(DB_EXECUTE, printk(")EX-0 "))
492                 return;
493         }
494
495         /*
496          * Search through the input_Q for a command destined
497          * for an idle target/lun.
498          */
499
500         cmd = (struct scsi_cmnd *) hostdata->input_Q;
501         prev = NULL;
502         while (cmd) {
503                 if (!(hostdata->busy[cmd->device->id] & (1 << cmd->device->lun)))
504                         break;
505                 prev = cmd;
506                 cmd = (struct scsi_cmnd *) cmd->host_scribble;
507         }
508
509         /* quit if queue empty or all possible targets are busy */
510
511         if (!cmd) {
512                 DB(DB_EXECUTE, printk(")EX-1 "))
513                 return;
514         }
515
516         /*  remove command from queue */
517
518         if (prev)
519                 prev->host_scribble = cmd->host_scribble;
520         else
521                 hostdata->input_Q = (struct scsi_cmnd *) cmd->host_scribble;
522
523 #ifdef PROC_STATISTICS
524         hostdata->cmd_cnt[cmd->device->id]++;
525 #endif
526
527         /*
528          * Start the selection process
529          */
530
531         if (cmd->sc_data_direction == DMA_TO_DEVICE)
532                 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);
533         else
534                 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id | DSTID_DPD);
535
536 /* Now we need to figure out whether or not this command is a good
537  * candidate for disconnect/reselect. We guess to the best of our
538  * ability, based on a set of hierarchical rules. When several
539  * devices are operating simultaneously, disconnects are usually
540  * an advantage. In a single device system, or if only 1 device
541  * is being accessed, transfers usually go faster if disconnects
542  * are not allowed:
543  *
544  * + Commands should NEVER disconnect if hostdata->disconnect =
545  *   DIS_NEVER (this holds for tape drives also), and ALWAYS
546  *   disconnect if hostdata->disconnect = DIS_ALWAYS.
547  * + Tape drive commands should always be allowed to disconnect.
548  * + Disconnect should be allowed if disconnected_Q isn't empty.
549  * + Commands should NOT disconnect if input_Q is empty.
550  * + Disconnect should be allowed if there are commands in input_Q
551  *   for a different target/lun. In this case, the other commands
552  *   should be made disconnect-able, if not already.
553  *
554  * I know, I know - this code would flunk me out of any
555  * "C Programming 101" class ever offered. But it's easy
556  * to change around and experiment with for now.
557  */
558
559         cmd->SCp.phase = 0;     /* assume no disconnect */
560         if (hostdata->disconnect == DIS_NEVER)
561                 goto no;
562         if (hostdata->disconnect == DIS_ALWAYS)
563                 goto yes;
564         if (cmd->device->type == 1)     /* tape drive? */
565                 goto yes;
566         if (hostdata->disconnected_Q)   /* other commands disconnected? */
567                 goto yes;
568         if (!(hostdata->input_Q))       /* input_Q empty? */
569                 goto no;
570         for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;
571              prev = (struct scsi_cmnd *) prev->host_scribble) {
572                 if ((prev->device->id != cmd->device->id) ||
573                     (prev->device->lun != cmd->device->lun)) {
574                         for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;
575                              prev = (struct scsi_cmnd *) prev->host_scribble)
576                                 prev->SCp.phase = 1;
577                         goto yes;
578                 }
579         }
580
581         goto no;
582
583  yes:
584         cmd->SCp.phase = 1;
585
586 #ifdef PROC_STATISTICS
587         hostdata->disc_allowed_cnt[cmd->device->id]++;
588 #endif
589
590  no:
591
592         write_wd33c93(regs, WD_SOURCE_ID, ((cmd->SCp.phase) ? SRCID_ER : 0));
593
594         write_wd33c93(regs, WD_TARGET_LUN, cmd->device->lun);
595         write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
596                       hostdata->sync_xfer[cmd->device->id]);
597         hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
598
599         if ((hostdata->level2 == L2_NONE) ||
600             (hostdata->sync_stat[cmd->device->id] == SS_UNSET)) {
601
602                 /*
603                  * Do a 'Select-With-ATN' command. This will end with
604                  * one of the following interrupts:
605                  *    CSR_RESEL_AM:  failure - can try again later.
606                  *    CSR_TIMEOUT:   failure - give up.
607                  *    CSR_SELECT:    success - proceed.
608                  */
609
610                 hostdata->selecting = cmd;
611
612 /* Every target has its own synchronous transfer setting, kept in the
613  * sync_xfer array, and a corresponding status byte in sync_stat[].
614  * Each target's sync_stat[] entry is initialized to SX_UNSET, and its
615  * sync_xfer[] entry is initialized to the default/safe value. SS_UNSET
616  * means that the parameters are undetermined as yet, and that we
617  * need to send an SDTR message to this device after selection is
618  * complete: We set SS_FIRST to tell the interrupt routine to do so.
619  * If we've been asked not to try synchronous transfers on this
620  * target (and _all_ luns within it), we'll still send the SDTR message
621  * later, but at that time we'll negotiate for async by specifying a
622  * sync fifo depth of 0.
623  */
624                 if (hostdata->sync_stat[cmd->device->id] == SS_UNSET)
625                         hostdata->sync_stat[cmd->device->id] = SS_FIRST;
626                 hostdata->state = S_SELECTING;
627                 write_wd33c93_count(regs, 0);   /* guarantee a DATA_PHASE interrupt */
628                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN);
629         } else {
630
631                 /*
632                  * Do a 'Select-With-ATN-Xfer' command. This will end with
633                  * one of the following interrupts:
634                  *    CSR_RESEL_AM:  failure - can try again later.
635                  *    CSR_TIMEOUT:   failure - give up.
636                  *    anything else: success - proceed.
637                  */
638
639                 hostdata->connected = cmd;
640                 write_wd33c93(regs, WD_COMMAND_PHASE, 0);
641
642                 /* copy command_descriptor_block into WD chip
643                  * (take advantage of auto-incrementing)
644                  */
645
646                 write_wd33c93_cdb(regs, cmd->cmd_len, cmd->cmnd);
647
648                 /* The wd33c93 only knows about Group 0, 1, and 5 commands when
649                  * it's doing a 'select-and-transfer'. To be safe, we write the
650                  * size of the CDB into the OWN_ID register for every case. This
651                  * way there won't be problems with vendor-unique, audio, etc.
652                  */
653
654                 write_wd33c93(regs, WD_OWN_ID, cmd->cmd_len);
655
656                 /* When doing a non-disconnect command with DMA, we can save
657                  * ourselves a DATA phase interrupt later by setting everything
658                  * up ahead of time.
659                  */
660
661                 if ((cmd->SCp.phase == 0) && (hostdata->no_dma == 0)) {
662                         if (hostdata->dma_setup(cmd,
663                             (cmd->sc_data_direction == DMA_TO_DEVICE) ?
664                              DATA_OUT_DIR : DATA_IN_DIR))
665                                 write_wd33c93_count(regs, 0);   /* guarantee a DATA_PHASE interrupt */
666                         else {
667                                 write_wd33c93_count(regs,
668                                                     cmd->SCp.this_residual);
669                                 write_wd33c93(regs, WD_CONTROL,
670                                               CTRL_IDI | CTRL_EDI | hostdata->dma_mode);
671                                 hostdata->dma = D_DMA_RUNNING;
672                         }
673                 } else
674                         write_wd33c93_count(regs, 0);   /* guarantee a DATA_PHASE interrupt */
675
676                 hostdata->state = S_RUNNING_LEVEL2;
677                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
678         }
679
680         /*
681          * Since the SCSI bus can handle only 1 connection at a time,
682          * we get out of here now. If the selection fails, or when
683          * the command disconnects, we'll come back to this routine
684          * to search the input_Q again...
685          */
686
687         DB(DB_EXECUTE,
688            printk("%s%ld)EX-2 ", (cmd->SCp.phase) ? "d:" : "", cmd->serial_number))
689 }
690
691 static void
692 transfer_pio(const wd33c93_regs regs, uchar * buf, int cnt,
693              int data_in_dir, struct WD33C93_hostdata *hostdata)
694 {
695         uchar asr;
696
697         DB(DB_TRANSFER,
698            printk("(%p,%d,%s:", buf, cnt, data_in_dir ? "in" : "out"))
699
700         write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
701         write_wd33c93_count(regs, cnt);
702         write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
703         if (data_in_dir) {
704                 do {
705                         asr = read_aux_stat(regs);
706                         if (asr & ASR_DBR)
707                                 *buf++ = read_wd33c93(regs, WD_DATA);
708                 } while (!(asr & ASR_INT));
709         } else {
710                 do {
711                         asr = read_aux_stat(regs);
712                         if (asr & ASR_DBR)
713                                 write_wd33c93(regs, WD_DATA, *buf++);
714                 } while (!(asr & ASR_INT));
715         }
716
717         /* Note: we are returning with the interrupt UN-cleared.
718          * Since (presumably) an entire I/O operation has
719          * completed, the bus phase is probably different, and
720          * the interrupt routine will discover this when it
721          * responds to the uncleared int.
722          */
723
724 }
725
726 static void
727 transfer_bytes(const wd33c93_regs regs, struct scsi_cmnd *cmd,
728                 int data_in_dir)
729 {
730         struct WD33C93_hostdata *hostdata;
731         unsigned long length;
732
733         hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata;
734
735 /* Normally, you'd expect 'this_residual' to be non-zero here.
736  * In a series of scatter-gather transfers, however, this
737  * routine will usually be called with 'this_residual' equal
738  * to 0 and 'buffers_residual' non-zero. This means that a
739  * previous transfer completed, clearing 'this_residual', and
740  * now we need to setup the next scatter-gather buffer as the
741  * source or destination for THIS transfer.
742  */
743         if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
744                 ++cmd->SCp.buffer;
745                 --cmd->SCp.buffers_residual;
746                 cmd->SCp.this_residual = cmd->SCp.buffer->length;
747                 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
748         }
749         if (!cmd->SCp.this_residual) /* avoid bogus setups */
750                 return;
751
752         write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
753                       hostdata->sync_xfer[cmd->device->id]);
754
755 /* 'hostdata->no_dma' is TRUE if we don't even want to try DMA.
756  * Update 'this_residual' and 'ptr' after 'transfer_pio()' returns.
757  */
758
759         if (hostdata->no_dma || hostdata->dma_setup(cmd, data_in_dir)) {
760 #ifdef PROC_STATISTICS
761                 hostdata->pio_cnt++;
762 #endif
763                 transfer_pio(regs, (uchar *) cmd->SCp.ptr,
764                              cmd->SCp.this_residual, data_in_dir, hostdata);
765                 length = cmd->SCp.this_residual;
766                 cmd->SCp.this_residual = read_wd33c93_count(regs);
767                 cmd->SCp.ptr += (length - cmd->SCp.this_residual);
768         }
769
770 /* We are able to do DMA (in fact, the Amiga hardware is
771  * already going!), so start up the wd33c93 in DMA mode.
772  * We set 'hostdata->dma' = D_DMA_RUNNING so that when the
773  * transfer completes and causes an interrupt, we're
774  * reminded to tell the Amiga to shut down its end. We'll
775  * postpone the updating of 'this_residual' and 'ptr'
776  * until then.
777  */
778
779         else {
780 #ifdef PROC_STATISTICS
781                 hostdata->dma_cnt++;
782 #endif
783                 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | hostdata->dma_mode);
784                 write_wd33c93_count(regs, cmd->SCp.this_residual);
785
786                 if ((hostdata->level2 >= L2_DATA) ||
787                     (hostdata->level2 == L2_BASIC && cmd->SCp.phase == 0)) {
788                         write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
789                         write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
790                         hostdata->state = S_RUNNING_LEVEL2;
791                 } else
792                         write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
793
794                 hostdata->dma = D_DMA_RUNNING;
795         }
796 }
797
798 void
799 wd33c93_intr(struct Scsi_Host *instance)
800 {
801         struct WD33C93_hostdata *hostdata =
802             (struct WD33C93_hostdata *) instance->hostdata;
803         const wd33c93_regs regs = hostdata->regs;
804         struct scsi_cmnd *patch, *cmd;
805         uchar asr, sr, phs, id, lun, *ucp, msg;
806         unsigned long length, flags;
807
808         asr = read_aux_stat(regs);
809         if (!(asr & ASR_INT) || (asr & ASR_BSY))
810                 return;
811
812         spin_lock_irqsave(&hostdata->lock, flags);
813
814 #ifdef PROC_STATISTICS
815         hostdata->int_cnt++;
816 #endif
817
818         cmd = (struct scsi_cmnd *) hostdata->connected; /* assume we're connected */
819         sr = read_wd33c93(regs, WD_SCSI_STATUS);        /* clear the interrupt */
820         phs = read_wd33c93(regs, WD_COMMAND_PHASE);
821
822         DB(DB_INTR, printk("{%02x:%02x-", asr, sr))
823
824 /* After starting a DMA transfer, the next interrupt
825  * is guaranteed to be in response to completion of
826  * the transfer. Since the Amiga DMA hardware runs in
827  * in an open-ended fashion, it needs to be told when
828  * to stop; do that here if D_DMA_RUNNING is true.
829  * Also, we have to update 'this_residual' and 'ptr'
830  * based on the contents of the TRANSFER_COUNT register,
831  * in case the device decided to do an intermediate
832  * disconnect (a device may do this if it has to do a
833  * seek, or just to be nice and let other devices have
834  * some bus time during long transfers). After doing
835  * whatever is needed, we go on and service the WD3393
836  * interrupt normally.
837  */
838             if (hostdata->dma == D_DMA_RUNNING) {
839                 DB(DB_TRANSFER,
840                    printk("[%p/%d:", cmd->SCp.ptr, cmd->SCp.this_residual))
841                     hostdata->dma_stop(cmd->device->host, cmd, 1);
842                 hostdata->dma = D_DMA_OFF;
843                 length = cmd->SCp.this_residual;
844                 cmd->SCp.this_residual = read_wd33c93_count(regs);
845                 cmd->SCp.ptr += (length - cmd->SCp.this_residual);
846                 DB(DB_TRANSFER,
847                    printk("%p/%d]", cmd->SCp.ptr, cmd->SCp.this_residual))
848         }
849
850 /* Respond to the specific WD3393 interrupt - there are quite a few! */
851         switch (sr) {
852         case CSR_TIMEOUT:
853                 DB(DB_INTR, printk("TIMEOUT"))
854
855                     if (hostdata->state == S_RUNNING_LEVEL2)
856                         hostdata->connected = NULL;
857                 else {
858                         cmd = (struct scsi_cmnd *) hostdata->selecting; /* get a valid cmd */
859                         hostdata->selecting = NULL;
860                 }
861
862                 cmd->result = DID_NO_CONNECT << 16;
863                 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
864                 hostdata->state = S_UNCONNECTED;
865                 cmd->scsi_done(cmd);
866
867                 /* From esp.c:
868                  * There is a window of time within the scsi_done() path
869                  * of execution where interrupts are turned back on full
870                  * blast and left that way.  During that time we could
871                  * reconnect to a disconnected command, then we'd bomb
872                  * out below.  We could also end up executing two commands
873                  * at _once_.  ...just so you know why the restore_flags()
874                  * is here...
875                  */
876
877                 spin_unlock_irqrestore(&hostdata->lock, flags);
878
879 /* We are not connected to a target - check to see if there
880  * are commands waiting to be executed.
881  */
882
883                 wd33c93_execute(instance);
884                 break;
885
886 /* Note: this interrupt should not occur in a LEVEL2 command */
887
888         case CSR_SELECT:
889                 DB(DB_INTR, printk("SELECT"))
890                     hostdata->connected = cmd =
891                     (struct scsi_cmnd *) hostdata->selecting;
892                 hostdata->selecting = NULL;
893
894                 /* construct an IDENTIFY message with correct disconnect bit */
895
896                 hostdata->outgoing_msg[0] = (0x80 | 0x00 | cmd->device->lun);
897                 if (cmd->SCp.phase)
898                         hostdata->outgoing_msg[0] |= 0x40;
899
900                 if (hostdata->sync_stat[cmd->device->id] == SS_FIRST) {
901
902                         hostdata->sync_stat[cmd->device->id] = SS_WAITING;
903
904 /* Tack on a 2nd message to ask about synchronous transfers. If we've
905  * been asked to do only asynchronous transfers on this device, we
906  * request a fifo depth of 0, which is equivalent to async - should
907  * solve the problems some people have had with GVP's Guru ROM.
908  */
909
910                         hostdata->outgoing_msg[1] = EXTENDED_MESSAGE;
911                         hostdata->outgoing_msg[2] = 3;
912                         hostdata->outgoing_msg[3] = EXTENDED_SDTR;
913                         if (hostdata->no_sync & (1 << cmd->device->id)) {
914                                 calc_sync_msg(hostdata->default_sx_per, 0,
915                                                 0, hostdata->outgoing_msg + 4);
916                         } else {
917                                 calc_sync_msg(optimum_sx_per(hostdata),
918                                                 OPTIMUM_SX_OFF,
919                                                 hostdata->fast,
920                                                 hostdata->outgoing_msg + 4);
921                         }
922                         hostdata->outgoing_len = 6;
923 #ifdef SYNC_DEBUG
924                         ucp = hostdata->outgoing_msg + 1;
925                         printk(" sending SDTR %02x03%02x%02x%02x ",
926                                 ucp[0], ucp[2], ucp[3], ucp[4]);
927 #endif
928                 } else
929                         hostdata->outgoing_len = 1;
930
931                 hostdata->state = S_CONNECTED;
932                 spin_unlock_irqrestore(&hostdata->lock, flags);
933                 break;
934
935         case CSR_XFER_DONE | PHS_DATA_IN:
936         case CSR_UNEXP | PHS_DATA_IN:
937         case CSR_SRV_REQ | PHS_DATA_IN:
938                 DB(DB_INTR,
939                    printk("IN-%d.%d", cmd->SCp.this_residual,
940                           cmd->SCp.buffers_residual))
941                     transfer_bytes(regs, cmd, DATA_IN_DIR);
942                 if (hostdata->state != S_RUNNING_LEVEL2)
943                         hostdata->state = S_CONNECTED;
944                 spin_unlock_irqrestore(&hostdata->lock, flags);
945                 break;
946
947         case CSR_XFER_DONE | PHS_DATA_OUT:
948         case CSR_UNEXP | PHS_DATA_OUT:
949         case CSR_SRV_REQ | PHS_DATA_OUT:
950                 DB(DB_INTR,
951                    printk("OUT-%d.%d", cmd->SCp.this_residual,
952                           cmd->SCp.buffers_residual))
953                     transfer_bytes(regs, cmd, DATA_OUT_DIR);
954                 if (hostdata->state != S_RUNNING_LEVEL2)
955                         hostdata->state = S_CONNECTED;
956                 spin_unlock_irqrestore(&hostdata->lock, flags);
957                 break;
958
959 /* Note: this interrupt should not occur in a LEVEL2 command */
960
961         case CSR_XFER_DONE | PHS_COMMAND:
962         case CSR_UNEXP | PHS_COMMAND:
963         case CSR_SRV_REQ | PHS_COMMAND:
964                 DB(DB_INTR, printk("CMND-%02x,%ld", cmd->cmnd[0], cmd->serial_number))
965                     transfer_pio(regs, cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR,
966                                  hostdata);
967                 hostdata->state = S_CONNECTED;
968                 spin_unlock_irqrestore(&hostdata->lock, flags);
969                 break;
970
971         case CSR_XFER_DONE | PHS_STATUS:
972         case CSR_UNEXP | PHS_STATUS:
973         case CSR_SRV_REQ | PHS_STATUS:
974                 DB(DB_INTR, printk("STATUS="))
975                 cmd->SCp.Status = read_1_byte(regs);
976                 DB(DB_INTR, printk("%02x", cmd->SCp.Status))
977                     if (hostdata->level2 >= L2_BASIC) {
978                         sr = read_wd33c93(regs, WD_SCSI_STATUS);        /* clear interrupt */
979                         udelay(7);
980                         hostdata->state = S_RUNNING_LEVEL2;
981                         write_wd33c93(regs, WD_COMMAND_PHASE, 0x50);
982                         write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
983                 } else {
984                         hostdata->state = S_CONNECTED;
985                 }
986                 spin_unlock_irqrestore(&hostdata->lock, flags);
987                 break;
988
989         case CSR_XFER_DONE | PHS_MESS_IN:
990         case CSR_UNEXP | PHS_MESS_IN:
991         case CSR_SRV_REQ | PHS_MESS_IN:
992                 DB(DB_INTR, printk("MSG_IN="))
993
994                 msg = read_1_byte(regs);
995                 sr = read_wd33c93(regs, WD_SCSI_STATUS);        /* clear interrupt */
996                 udelay(7);
997
998                 hostdata->incoming_msg[hostdata->incoming_ptr] = msg;
999                 if (hostdata->incoming_msg[0] == EXTENDED_MESSAGE)
1000                         msg = EXTENDED_MESSAGE;
1001                 else
1002                         hostdata->incoming_ptr = 0;
1003
1004                 cmd->SCp.Message = msg;
1005                 switch (msg) {
1006
1007                 case COMMAND_COMPLETE:
1008                         DB(DB_INTR, printk("CCMP-%ld", cmd->serial_number))
1009                             write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1010                         hostdata->state = S_PRE_CMP_DISC;
1011                         break;
1012
1013                 case SAVE_POINTERS:
1014                         DB(DB_INTR, printk("SDP"))
1015                             write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1016                         hostdata->state = S_CONNECTED;
1017                         break;
1018
1019                 case RESTORE_POINTERS:
1020                         DB(DB_INTR, printk("RDP"))
1021                             if (hostdata->level2 >= L2_BASIC) {
1022                                 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
1023                                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1024                                 hostdata->state = S_RUNNING_LEVEL2;
1025                         } else {
1026                                 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1027                                 hostdata->state = S_CONNECTED;
1028                         }
1029                         break;
1030
1031                 case DISCONNECT:
1032                         DB(DB_INTR, printk("DIS"))
1033                             cmd->device->disconnect = 1;
1034                         write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1035                         hostdata->state = S_PRE_TMP_DISC;
1036                         break;
1037
1038                 case MESSAGE_REJECT:
1039                         DB(DB_INTR, printk("REJ"))
1040 #ifdef SYNC_DEBUG
1041                             printk("-REJ-");
1042 #endif
1043                         if (hostdata->sync_stat[cmd->device->id] == SS_WAITING) {
1044                                 hostdata->sync_stat[cmd->device->id] = SS_SET;
1045                                 /* we want default_sx_per, not DEFAULT_SX_PER */
1046                                 hostdata->sync_xfer[cmd->device->id] =
1047                                         calc_sync_xfer(hostdata->default_sx_per
1048                                                 / 4, 0, 0, hostdata->sx_table);
1049                         }
1050                         write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1051                         hostdata->state = S_CONNECTED;
1052                         break;
1053
1054                 case EXTENDED_MESSAGE:
1055                         DB(DB_INTR, printk("EXT"))
1056
1057                             ucp = hostdata->incoming_msg;
1058
1059 #ifdef SYNC_DEBUG
1060                         printk("%02x", ucp[hostdata->incoming_ptr]);
1061 #endif
1062                         /* Is this the last byte of the extended message? */
1063
1064                         if ((hostdata->incoming_ptr >= 2) &&
1065                             (hostdata->incoming_ptr == (ucp[1] + 1))) {
1066
1067                                 switch (ucp[2]) {       /* what's the EXTENDED code? */
1068                                 case EXTENDED_SDTR:
1069                                         /* default to default async period */
1070                                         id = calc_sync_xfer(hostdata->
1071                                                         default_sx_per / 4, 0,
1072                                                         0, hostdata->sx_table);
1073                                         if (hostdata->sync_stat[cmd->device->id] !=
1074                                             SS_WAITING) {
1075
1076 /* A device has sent an unsolicited SDTR message; rather than go
1077  * through the effort of decoding it and then figuring out what
1078  * our reply should be, we're just gonna say that we have a
1079  * synchronous fifo depth of 0. This will result in asynchronous
1080  * transfers - not ideal but so much easier.
1081  * Actually, this is OK because it assures us that if we don't
1082  * specifically ask for sync transfers, we won't do any.
1083  */
1084
1085                                                 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1086                                                 hostdata->outgoing_msg[0] =
1087                                                     EXTENDED_MESSAGE;
1088                                                 hostdata->outgoing_msg[1] = 3;
1089                                                 hostdata->outgoing_msg[2] =
1090                                                     EXTENDED_SDTR;
1091                                                 calc_sync_msg(hostdata->
1092                                                         default_sx_per, 0,
1093                                                         0, hostdata->outgoing_msg + 3);
1094                                                 hostdata->outgoing_len = 5;
1095                                         } else {
1096                                                 if (ucp[4]) /* well, sync transfer */
1097                                                         id = calc_sync_xfer(ucp[3], ucp[4],
1098                                                                         hostdata->fast,
1099                                                                         hostdata->sx_table);
1100                                                 else if (ucp[3]) /* very unlikely... */
1101                                                         id = calc_sync_xfer(ucp[3], ucp[4],
1102                                                                         0, hostdata->sx_table);
1103                                         }
1104                                         hostdata->sync_xfer[cmd->device->id] = id;
1105 #ifdef SYNC_DEBUG
1106                                         printk(" sync_xfer=%02x\n",
1107                                                hostdata->sync_xfer[cmd->device->id]);
1108 #endif
1109                                         hostdata->sync_stat[cmd->device->id] =
1110                                             SS_SET;
1111                                         write_wd33c93_cmd(regs,
1112                                                           WD_CMD_NEGATE_ACK);
1113                                         hostdata->state = S_CONNECTED;
1114                                         break;
1115                                 case EXTENDED_WDTR:
1116                                         write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1117                                         printk("sending WDTR ");
1118                                         hostdata->outgoing_msg[0] =
1119                                             EXTENDED_MESSAGE;
1120                                         hostdata->outgoing_msg[1] = 2;
1121                                         hostdata->outgoing_msg[2] =
1122                                             EXTENDED_WDTR;
1123                                         hostdata->outgoing_msg[3] = 0;  /* 8 bit transfer width */
1124                                         hostdata->outgoing_len = 4;
1125                                         write_wd33c93_cmd(regs,
1126                                                           WD_CMD_NEGATE_ACK);
1127                                         hostdata->state = S_CONNECTED;
1128                                         break;
1129                                 default:
1130                                         write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1131                                         printk
1132                                             ("Rejecting Unknown Extended Message(%02x). ",
1133                                              ucp[2]);
1134                                         hostdata->outgoing_msg[0] =
1135                                             MESSAGE_REJECT;
1136                                         hostdata->outgoing_len = 1;
1137                                         write_wd33c93_cmd(regs,
1138                                                           WD_CMD_NEGATE_ACK);
1139                                         hostdata->state = S_CONNECTED;
1140                                         break;
1141                                 }
1142                                 hostdata->incoming_ptr = 0;
1143                         }
1144
1145                         /* We need to read more MESS_IN bytes for the extended message */
1146
1147                         else {
1148                                 hostdata->incoming_ptr++;
1149                                 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1150                                 hostdata->state = S_CONNECTED;
1151                         }
1152                         break;
1153
1154                 default:
1155                         printk("Rejecting Unknown Message(%02x) ", msg);
1156                         write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1157                         hostdata->outgoing_msg[0] = MESSAGE_REJECT;
1158                         hostdata->outgoing_len = 1;
1159                         write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1160                         hostdata->state = S_CONNECTED;
1161                 }
1162                 spin_unlock_irqrestore(&hostdata->lock, flags);
1163                 break;
1164
1165 /* Note: this interrupt will occur only after a LEVEL2 command */
1166
1167         case CSR_SEL_XFER_DONE:
1168
1169 /* Make sure that reselection is enabled at this point - it may
1170  * have been turned off for the command that just completed.
1171  */
1172
1173                 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1174                 if (phs == 0x60) {
1175                         DB(DB_INTR, printk("SX-DONE-%ld", cmd->serial_number))
1176                             cmd->SCp.Message = COMMAND_COMPLETE;
1177                         lun = read_wd33c93(regs, WD_TARGET_LUN);
1178                         DB(DB_INTR, printk(":%d.%d", cmd->SCp.Status, lun))
1179                             hostdata->connected = NULL;
1180                         hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1181                         hostdata->state = S_UNCONNECTED;
1182                         if (cmd->SCp.Status == ILLEGAL_STATUS_BYTE)
1183                                 cmd->SCp.Status = lun;
1184                         if (cmd->cmnd[0] == REQUEST_SENSE
1185                             && cmd->SCp.Status != GOOD)
1186                                 cmd->result =
1187                                     (cmd->
1188                                      result & 0x00ffff) | (DID_ERROR << 16);
1189                         else
1190                                 cmd->result =
1191                                     cmd->SCp.Status | (cmd->SCp.Message << 8);
1192                         cmd->scsi_done(cmd);
1193
1194 /* We are no longer  connected to a target - check to see if
1195  * there are commands waiting to be executed.
1196  */
1197                         spin_unlock_irqrestore(&hostdata->lock, flags);
1198                         wd33c93_execute(instance);
1199                 } else {
1200                         printk
1201                             ("%02x:%02x:%02x-%ld: Unknown SEL_XFER_DONE phase!!---",
1202                              asr, sr, phs, cmd->serial_number);
1203                         spin_unlock_irqrestore(&hostdata->lock, flags);
1204                 }
1205                 break;
1206
1207 /* Note: this interrupt will occur only after a LEVEL2 command */
1208
1209         case CSR_SDP:
1210                 DB(DB_INTR, printk("SDP"))
1211                     hostdata->state = S_RUNNING_LEVEL2;
1212                 write_wd33c93(regs, WD_COMMAND_PHASE, 0x41);
1213                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1214                 spin_unlock_irqrestore(&hostdata->lock, flags);
1215                 break;
1216
1217         case CSR_XFER_DONE | PHS_MESS_OUT:
1218         case CSR_UNEXP | PHS_MESS_OUT:
1219         case CSR_SRV_REQ | PHS_MESS_OUT:
1220                 DB(DB_INTR, printk("MSG_OUT="))
1221
1222 /* To get here, we've probably requested MESSAGE_OUT and have
1223  * already put the correct bytes in outgoing_msg[] and filled
1224  * in outgoing_len. We simply send them out to the SCSI bus.
1225  * Sometimes we get MESSAGE_OUT phase when we're not expecting
1226  * it - like when our SDTR message is rejected by a target. Some
1227  * targets send the REJECT before receiving all of the extended
1228  * message, and then seem to go back to MESSAGE_OUT for a byte
1229  * or two. Not sure why, or if I'm doing something wrong to
1230  * cause this to happen. Regardless, it seems that sending
1231  * NOP messages in these situations results in no harm and
1232  * makes everyone happy.
1233  */
1234                     if (hostdata->outgoing_len == 0) {
1235                         hostdata->outgoing_len = 1;
1236                         hostdata->outgoing_msg[0] = NOP;
1237                 }
1238                 transfer_pio(regs, hostdata->outgoing_msg,
1239                              hostdata->outgoing_len, DATA_OUT_DIR, hostdata);
1240                 DB(DB_INTR, printk("%02x", hostdata->outgoing_msg[0]))
1241                     hostdata->outgoing_len = 0;
1242                 hostdata->state = S_CONNECTED;
1243                 spin_unlock_irqrestore(&hostdata->lock, flags);
1244                 break;
1245
1246         case CSR_UNEXP_DISC:
1247
1248 /* I think I've seen this after a request-sense that was in response
1249  * to an error condition, but not sure. We certainly need to do
1250  * something when we get this interrupt - the question is 'what?'.
1251  * Let's think positively, and assume some command has finished
1252  * in a legal manner (like a command that provokes a request-sense),
1253  * so we treat it as a normal command-complete-disconnect.
1254  */
1255
1256 /* Make sure that reselection is enabled at this point - it may
1257  * have been turned off for the command that just completed.
1258  */
1259
1260                 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1261                 if (cmd == NULL) {
1262                         printk(" - Already disconnected! ");
1263                         hostdata->state = S_UNCONNECTED;
1264                         spin_unlock_irqrestore(&hostdata->lock, flags);
1265                         return;
1266                 }
1267                 DB(DB_INTR, printk("UNEXP_DISC-%ld", cmd->serial_number))
1268                     hostdata->connected = NULL;
1269                 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1270                 hostdata->state = S_UNCONNECTED;
1271                 if (cmd->cmnd[0] == REQUEST_SENSE && cmd->SCp.Status != GOOD)
1272                         cmd->result =
1273                             (cmd->result & 0x00ffff) | (DID_ERROR << 16);
1274                 else
1275                         cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
1276                 cmd->scsi_done(cmd);
1277
1278 /* We are no longer connected to a target - check to see if
1279  * there are commands waiting to be executed.
1280  */
1281                 /* look above for comments on scsi_done() */
1282                 spin_unlock_irqrestore(&hostdata->lock, flags);
1283                 wd33c93_execute(instance);
1284                 break;
1285
1286         case CSR_DISC:
1287
1288 /* Make sure that reselection is enabled at this point - it may
1289  * have been turned off for the command that just completed.
1290  */
1291
1292                 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1293                 DB(DB_INTR, printk("DISC-%ld", cmd->serial_number))
1294                     if (cmd == NULL) {
1295                         printk(" - Already disconnected! ");
1296                         hostdata->state = S_UNCONNECTED;
1297                 }
1298                 switch (hostdata->state) {
1299                 case S_PRE_CMP_DISC:
1300                         hostdata->connected = NULL;
1301                         hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1302                         hostdata->state = S_UNCONNECTED;
1303                         DB(DB_INTR, printk(":%d", cmd->SCp.Status))
1304                             if (cmd->cmnd[0] == REQUEST_SENSE
1305                                 && cmd->SCp.Status != GOOD)
1306                                 cmd->result =
1307                                     (cmd->
1308                                      result & 0x00ffff) | (DID_ERROR << 16);
1309                         else
1310                                 cmd->result =
1311                                     cmd->SCp.Status | (cmd->SCp.Message << 8);
1312                         cmd->scsi_done(cmd);
1313                         break;
1314                 case S_PRE_TMP_DISC:
1315                 case S_RUNNING_LEVEL2:
1316                         cmd->host_scribble = (uchar *) hostdata->disconnected_Q;
1317                         hostdata->disconnected_Q = cmd;
1318                         hostdata->connected = NULL;
1319                         hostdata->state = S_UNCONNECTED;
1320
1321 #ifdef PROC_STATISTICS
1322                         hostdata->disc_done_cnt[cmd->device->id]++;
1323 #endif
1324
1325                         break;
1326                 default:
1327                         printk("*** Unexpected DISCONNECT interrupt! ***");
1328                         hostdata->state = S_UNCONNECTED;
1329                 }
1330
1331 /* We are no longer connected to a target - check to see if
1332  * there are commands waiting to be executed.
1333  */
1334                 spin_unlock_irqrestore(&hostdata->lock, flags);
1335                 wd33c93_execute(instance);
1336                 break;
1337
1338         case CSR_RESEL_AM:
1339         case CSR_RESEL:
1340                 DB(DB_INTR, printk("RESEL%s", sr == CSR_RESEL_AM ? "_AM" : ""))
1341
1342                     /* Old chips (pre -A ???) don't have advanced features and will
1343                      * generate CSR_RESEL.  In that case we have to extract the LUN the
1344                      * hard way (see below).
1345                      * First we have to make sure this reselection didn't
1346                      * happen during Arbitration/Selection of some other device.
1347                      * If yes, put losing command back on top of input_Q.
1348                      */
1349                     if (hostdata->level2 <= L2_NONE) {
1350
1351                         if (hostdata->selecting) {
1352                                 cmd = (struct scsi_cmnd *) hostdata->selecting;
1353                                 hostdata->selecting = NULL;
1354                                 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1355                                 cmd->host_scribble =
1356                                     (uchar *) hostdata->input_Q;
1357                                 hostdata->input_Q = cmd;
1358                         }
1359                 }
1360
1361                 else {
1362
1363                         if (cmd) {
1364                                 if (phs == 0x00) {
1365                                         hostdata->busy[cmd->device->id] &=
1366                                             ~(1 << cmd->device->lun);
1367                                         cmd->host_scribble =
1368                                             (uchar *) hostdata->input_Q;
1369                                         hostdata->input_Q = cmd;
1370                                 } else {
1371                                         printk
1372                                             ("---%02x:%02x:%02x-TROUBLE: Intrusive ReSelect!---",
1373                                              asr, sr, phs);
1374                                         while (1)
1375                                                 printk("\r");
1376                                 }
1377                         }
1378
1379                 }
1380
1381                 /* OK - find out which device reselected us. */
1382
1383                 id = read_wd33c93(regs, WD_SOURCE_ID);
1384                 id &= SRCID_MASK;
1385
1386                 /* and extract the lun from the ID message. (Note that we don't
1387                  * bother to check for a valid message here - I guess this is
1388                  * not the right way to go, but...)
1389                  */
1390
1391                 if (sr == CSR_RESEL_AM) {
1392                         lun = read_wd33c93(regs, WD_DATA);
1393                         if (hostdata->level2 < L2_RESELECT)
1394                                 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1395                         lun &= 7;
1396                 } else {
1397                         /* Old chip; wait for msgin phase to pick up the LUN. */
1398                         for (lun = 255; lun; lun--) {
1399                                 if ((asr = read_aux_stat(regs)) & ASR_INT)
1400                                         break;
1401                                 udelay(10);
1402                         }
1403                         if (!(asr & ASR_INT)) {
1404                                 printk
1405                                     ("wd33c93: Reselected without IDENTIFY\n");
1406                                 lun = 0;
1407                         } else {
1408                                 /* Verify this is a change to MSG_IN and read the message */
1409                                 sr = read_wd33c93(regs, WD_SCSI_STATUS);
1410                                 udelay(7);
1411                                 if (sr == (CSR_ABORT | PHS_MESS_IN) ||
1412                                     sr == (CSR_UNEXP | PHS_MESS_IN) ||
1413                                     sr == (CSR_SRV_REQ | PHS_MESS_IN)) {
1414                                         /* Got MSG_IN, grab target LUN */
1415                                         lun = read_1_byte(regs);
1416                                         /* Now we expect a 'paused with ACK asserted' int.. */
1417                                         asr = read_aux_stat(regs);
1418                                         if (!(asr & ASR_INT)) {
1419                                                 udelay(10);
1420                                                 asr = read_aux_stat(regs);
1421                                                 if (!(asr & ASR_INT))
1422                                                         printk
1423                                                             ("wd33c93: No int after LUN on RESEL (%02x)\n",
1424                                                              asr);
1425                                         }
1426                                         sr = read_wd33c93(regs, WD_SCSI_STATUS);
1427                                         udelay(7);
1428                                         if (sr != CSR_MSGIN)
1429                                                 printk
1430                                                     ("wd33c93: Not paused with ACK on RESEL (%02x)\n",
1431                                                      sr);
1432                                         lun &= 7;
1433                                         write_wd33c93_cmd(regs,
1434                                                           WD_CMD_NEGATE_ACK);
1435                                 } else {
1436                                         printk
1437                                             ("wd33c93: Not MSG_IN on reselect (%02x)\n",
1438                                              sr);
1439                                         lun = 0;
1440                                 }
1441                         }
1442                 }
1443
1444                 /* Now we look for the command that's reconnecting. */
1445
1446                 cmd = (struct scsi_cmnd *) hostdata->disconnected_Q;
1447                 patch = NULL;
1448                 while (cmd) {
1449                         if (id == cmd->device->id && lun == cmd->device->lun)
1450                                 break;
1451                         patch = cmd;
1452                         cmd = (struct scsi_cmnd *) cmd->host_scribble;
1453                 }
1454
1455                 /* Hmm. Couldn't find a valid command.... What to do? */
1456
1457                 if (!cmd) {
1458                         printk
1459                             ("---TROUBLE: target %d.%d not in disconnect queue---",
1460                              id, lun);
1461                         spin_unlock_irqrestore(&hostdata->lock, flags);
1462                         return;
1463                 }
1464
1465                 /* Ok, found the command - now start it up again. */
1466
1467                 if (patch)
1468                         patch->host_scribble = cmd->host_scribble;
1469                 else
1470                         hostdata->disconnected_Q =
1471                             (struct scsi_cmnd *) cmd->host_scribble;
1472                 hostdata->connected = cmd;
1473
1474                 /* We don't need to worry about 'initialize_SCp()' or 'hostdata->busy[]'
1475                  * because these things are preserved over a disconnect.
1476                  * But we DO need to fix the DPD bit so it's correct for this command.
1477                  */
1478
1479                 if (cmd->sc_data_direction == DMA_TO_DEVICE)
1480                         write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);
1481                 else
1482                         write_wd33c93(regs, WD_DESTINATION_ID,
1483                                       cmd->device->id | DSTID_DPD);
1484                 if (hostdata->level2 >= L2_RESELECT) {
1485                         write_wd33c93_count(regs, 0);   /* we want a DATA_PHASE interrupt */
1486                         write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
1487                         write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1488                         hostdata->state = S_RUNNING_LEVEL2;
1489                 } else
1490                         hostdata->state = S_CONNECTED;
1491
1492                 DB(DB_INTR, printk("-%ld", cmd->serial_number))
1493                     spin_unlock_irqrestore(&hostdata->lock, flags);
1494                 break;
1495
1496         default:
1497                 printk("--UNKNOWN INTERRUPT:%02x:%02x:%02x--", asr, sr, phs);
1498                 spin_unlock_irqrestore(&hostdata->lock, flags);
1499         }
1500
1501         DB(DB_INTR, printk("} "))
1502
1503 }
1504
1505 static void
1506 reset_wd33c93(struct Scsi_Host *instance)
1507 {
1508         struct WD33C93_hostdata *hostdata =
1509             (struct WD33C93_hostdata *) instance->hostdata;
1510         const wd33c93_regs regs = hostdata->regs;
1511         uchar sr;
1512
1513 #ifdef CONFIG_SGI_IP22
1514         {
1515                 int busycount = 0;
1516                 extern void sgiwd93_reset(unsigned long);
1517                 /* wait 'til the chip gets some time for us */
1518                 while ((read_aux_stat(regs) & ASR_BSY) && busycount++ < 100)
1519                         udelay (10);
1520         /*
1521          * there are scsi devices out there, which manage to lock up
1522          * the wd33c93 in a busy condition. In this state it won't
1523          * accept the reset command. The only way to solve this is to
1524          * give the chip a hardware reset (if possible). The code below
1525          * does this for the SGI Indy, where this is possible
1526          */
1527         /* still busy ? */
1528         if (read_aux_stat(regs) & ASR_BSY)
1529                 sgiwd93_reset(instance->base); /* yeah, give it the hard one */
1530         }
1531 #endif
1532
1533         write_wd33c93(regs, WD_OWN_ID, OWNID_EAF | OWNID_RAF |
1534                       instance->this_id | hostdata->clock_freq);
1535         write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1536         write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
1537                       calc_sync_xfer(hostdata->default_sx_per / 4,
1538                                      DEFAULT_SX_OFF, 0, hostdata->sx_table));
1539         write_wd33c93(regs, WD_COMMAND, WD_CMD_RESET);
1540
1541
1542 #ifdef CONFIG_MVME147_SCSI
1543         udelay(25);             /* The old wd33c93 on MVME147 needs this, at least */
1544 #endif
1545
1546         while (!(read_aux_stat(regs) & ASR_INT))
1547                 ;
1548         sr = read_wd33c93(regs, WD_SCSI_STATUS);
1549
1550         hostdata->microcode = read_wd33c93(regs, WD_CDB_1);
1551         if (sr == 0x00)
1552                 hostdata->chip = C_WD33C93;
1553         else if (sr == 0x01) {
1554                 write_wd33c93(regs, WD_QUEUE_TAG, 0xa5);        /* any random number */
1555                 sr = read_wd33c93(regs, WD_QUEUE_TAG);
1556                 if (sr == 0xa5) {
1557                         hostdata->chip = C_WD33C93B;
1558                         write_wd33c93(regs, WD_QUEUE_TAG, 0);
1559                 } else
1560                         hostdata->chip = C_WD33C93A;
1561         } else
1562                 hostdata->chip = C_UNKNOWN_CHIP;
1563
1564         if (hostdata->chip != C_WD33C93B)       /* Fast SCSI unavailable */
1565                 hostdata->fast = 0;
1566
1567         write_wd33c93(regs, WD_TIMEOUT_PERIOD, TIMEOUT_PERIOD_VALUE);
1568         write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1569 }
1570
1571 int
1572 wd33c93_host_reset(struct scsi_cmnd * SCpnt)
1573 {
1574         struct Scsi_Host *instance;
1575         struct WD33C93_hostdata *hostdata;
1576         int i;
1577
1578         instance = SCpnt->device->host;
1579         hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1580
1581         printk("scsi%d: reset. ", instance->host_no);
1582         disable_irq(instance->irq);
1583
1584         hostdata->dma_stop(instance, NULL, 0);
1585         for (i = 0; i < 8; i++) {
1586                 hostdata->busy[i] = 0;
1587                 hostdata->sync_xfer[i] =
1588                         calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF,
1589                                         0, hostdata->sx_table);
1590                 hostdata->sync_stat[i] = SS_UNSET;      /* using default sync values */
1591         }
1592         hostdata->input_Q = NULL;
1593         hostdata->selecting = NULL;
1594         hostdata->connected = NULL;
1595         hostdata->disconnected_Q = NULL;
1596         hostdata->state = S_UNCONNECTED;
1597         hostdata->dma = D_DMA_OFF;
1598         hostdata->incoming_ptr = 0;
1599         hostdata->outgoing_len = 0;
1600
1601         reset_wd33c93(instance);
1602         SCpnt->result = DID_RESET << 16;
1603         enable_irq(instance->irq);
1604         return SUCCESS;
1605 }
1606
1607 int
1608 wd33c93_abort(struct scsi_cmnd * cmd)
1609 {
1610         struct Scsi_Host *instance;
1611         struct WD33C93_hostdata *hostdata;
1612         wd33c93_regs regs;
1613         struct scsi_cmnd *tmp, *prev;
1614
1615         disable_irq(cmd->device->host->irq);
1616
1617         instance = cmd->device->host;
1618         hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1619         regs = hostdata->regs;
1620
1621 /*
1622  * Case 1 : If the command hasn't been issued yet, we simply remove it
1623  *     from the input_Q.
1624  */
1625
1626         tmp = (struct scsi_cmnd *) hostdata->input_Q;
1627         prev = NULL;
1628         while (tmp) {
1629                 if (tmp == cmd) {
1630                         if (prev)
1631                                 prev->host_scribble = cmd->host_scribble;
1632                         else
1633                                 hostdata->input_Q =
1634                                     (struct scsi_cmnd *) cmd->host_scribble;
1635                         cmd->host_scribble = NULL;
1636                         cmd->result = DID_ABORT << 16;
1637                         printk
1638                             ("scsi%d: Abort - removing command %ld from input_Q. ",
1639                              instance->host_no, cmd->serial_number);
1640                         enable_irq(cmd->device->host->irq);
1641                         cmd->scsi_done(cmd);
1642                         return SUCCESS;
1643                 }
1644                 prev = tmp;
1645                 tmp = (struct scsi_cmnd *) tmp->host_scribble;
1646         }
1647
1648 /*
1649  * Case 2 : If the command is connected, we're going to fail the abort
1650  *     and let the high level SCSI driver retry at a later time or
1651  *     issue a reset.
1652  *
1653  *     Timeouts, and therefore aborted commands, will be highly unlikely
1654  *     and handling them cleanly in this situation would make the common
1655  *     case of noresets less efficient, and would pollute our code.  So,
1656  *     we fail.
1657  */
1658
1659         if (hostdata->connected == cmd) {
1660                 uchar sr, asr;
1661                 unsigned long timeout;
1662
1663                 printk("scsi%d: Aborting connected command %ld - ",
1664                        instance->host_no, cmd->serial_number);
1665
1666                 printk("stopping DMA - ");
1667                 if (hostdata->dma == D_DMA_RUNNING) {
1668                         hostdata->dma_stop(instance, cmd, 0);
1669                         hostdata->dma = D_DMA_OFF;
1670                 }
1671
1672                 printk("sending wd33c93 ABORT command - ");
1673                 write_wd33c93(regs, WD_CONTROL,
1674                               CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1675                 write_wd33c93_cmd(regs, WD_CMD_ABORT);
1676
1677 /* Now we have to attempt to flush out the FIFO... */
1678
1679                 printk("flushing fifo - ");
1680                 timeout = 1000000;
1681                 do {
1682                         asr = read_aux_stat(regs);
1683                         if (asr & ASR_DBR)
1684                                 read_wd33c93(regs, WD_DATA);
1685                 } while (!(asr & ASR_INT) && timeout-- > 0);
1686                 sr = read_wd33c93(regs, WD_SCSI_STATUS);
1687                 printk
1688                     ("asr=%02x, sr=%02x, %ld bytes un-transferred (timeout=%ld) - ",
1689                      asr, sr, read_wd33c93_count(regs), timeout);
1690
1691                 /*
1692                  * Abort command processed.
1693                  * Still connected.
1694                  * We must disconnect.
1695                  */
1696
1697                 printk("sending wd33c93 DISCONNECT command - ");
1698                 write_wd33c93_cmd(regs, WD_CMD_DISCONNECT);
1699
1700                 timeout = 1000000;
1701                 asr = read_aux_stat(regs);
1702                 while ((asr & ASR_CIP) && timeout-- > 0)
1703                         asr = read_aux_stat(regs);
1704                 sr = read_wd33c93(regs, WD_SCSI_STATUS);
1705                 printk("asr=%02x, sr=%02x.", asr, sr);
1706
1707                 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1708                 hostdata->connected = NULL;
1709                 hostdata->state = S_UNCONNECTED;
1710                 cmd->result = DID_ABORT << 16;
1711
1712 /*      sti();*/
1713                 wd33c93_execute(instance);
1714
1715                 enable_irq(cmd->device->host->irq);
1716                 cmd->scsi_done(cmd);
1717                 return SUCCESS;
1718         }
1719
1720 /*
1721  * Case 3: If the command is currently disconnected from the bus,
1722  * we're not going to expend much effort here: Let's just return
1723  * an ABORT_SNOOZE and hope for the best...
1724  */
1725
1726         tmp = (struct scsi_cmnd *) hostdata->disconnected_Q;
1727         while (tmp) {
1728                 if (tmp == cmd) {
1729                         printk
1730                             ("scsi%d: Abort - command %ld found on disconnected_Q - ",
1731                              instance->host_no, cmd->serial_number);
1732                         printk("Abort SNOOZE. ");
1733                         enable_irq(cmd->device->host->irq);
1734                         return FAILED;
1735                 }
1736                 tmp = (struct scsi_cmnd *) tmp->host_scribble;
1737         }
1738
1739 /*
1740  * Case 4 : If we reached this point, the command was not found in any of
1741  *     the queues.
1742  *
1743  * We probably reached this point because of an unlikely race condition
1744  * between the command completing successfully and the abortion code,
1745  * so we won't panic, but we will notify the user in case something really
1746  * broke.
1747  */
1748
1749 /*   sti();*/
1750         wd33c93_execute(instance);
1751
1752         enable_irq(cmd->device->host->irq);
1753         printk("scsi%d: warning : SCSI command probably completed successfully"
1754                "         before abortion. ", instance->host_no);
1755         return FAILED;
1756 }
1757
1758 #define MAX_WD33C93_HOSTS 4
1759 #define MAX_SETUP_ARGS ARRAY_SIZE(setup_args)
1760 #define SETUP_BUFFER_SIZE 200
1761 static char setup_buffer[SETUP_BUFFER_SIZE];
1762 static char setup_used[MAX_SETUP_ARGS];
1763 static int done_setup = 0;
1764
1765 static int
1766 wd33c93_setup(char *str)
1767 {
1768         int i;
1769         char *p1, *p2;
1770
1771         /* The kernel does some processing of the command-line before calling
1772          * this function: If it begins with any decimal or hex number arguments,
1773          * ints[0] = how many numbers found and ints[1] through [n] are the values
1774          * themselves. str points to where the non-numeric arguments (if any)
1775          * start: We do our own parsing of those. We construct synthetic 'nosync'
1776          * keywords out of numeric args (to maintain compatibility with older
1777          * versions) and then add the rest of the arguments.
1778          */
1779
1780         p1 = setup_buffer;
1781         *p1 = '\0';
1782         if (str)
1783                 strncpy(p1, str, SETUP_BUFFER_SIZE - strlen(setup_buffer));
1784         setup_buffer[SETUP_BUFFER_SIZE - 1] = '\0';
1785         p1 = setup_buffer;
1786         i = 0;
1787         while (*p1 && (i < MAX_SETUP_ARGS)) {
1788                 p2 = strchr(p1, ',');
1789                 if (p2) {
1790                         *p2 = '\0';
1791                         if (p1 != p2)
1792                                 setup_args[i] = p1;
1793                         p1 = p2 + 1;
1794                         i++;
1795                 } else {
1796                         setup_args[i] = p1;
1797                         break;
1798                 }
1799         }
1800         for (i = 0; i < MAX_SETUP_ARGS; i++)
1801                 setup_used[i] = 0;
1802         done_setup = 1;
1803
1804         return 1;
1805 }
1806 __setup("wd33c93=", wd33c93_setup);
1807
1808 /* check_setup_args() returns index if key found, 0 if not
1809  */
1810 static int
1811 check_setup_args(char *key, int *flags, int *val, char *buf)
1812 {
1813         int x;
1814         char *cp;
1815
1816         for (x = 0; x < MAX_SETUP_ARGS; x++) {
1817                 if (setup_used[x])
1818                         continue;
1819                 if (!strncmp(setup_args[x], key, strlen(key)))
1820                         break;
1821                 if (!strncmp(setup_args[x], "next", strlen("next")))
1822                         return 0;
1823         }
1824         if (x == MAX_SETUP_ARGS)
1825                 return 0;
1826         setup_used[x] = 1;
1827         cp = setup_args[x] + strlen(key);
1828         *val = -1;
1829         if (*cp != ':')
1830                 return ++x;
1831         cp++;
1832         if ((*cp >= '0') && (*cp <= '9')) {
1833                 *val = simple_strtoul(cp, NULL, 0);
1834         }
1835         return ++x;
1836 }
1837
1838 /*
1839  * Calculate internal data-transfer-clock cycle from input-clock
1840  * frequency (/MHz) and fill 'sx_table'.
1841  *
1842  * The original driver used to rely on a fixed sx_table, containing periods
1843  * for (only) the lower limits of the respective input-clock-frequency ranges
1844  * (8-10/12-15/16-20 MHz). Although it seems, that no problems ocurred with
1845  * this setting so far, it might be desirable to adjust the transfer periods
1846  * closer to the really attached, possibly 25% higher, input-clock, since
1847  * - the wd33c93 may really use a significant shorter period, than it has
1848  *   negotiated (eg. thrashing the target, which expects 4/8MHz, with 5/10MHz
1849  *   instead).
1850  * - the wd33c93 may ask the target for a lower transfer rate, than the target
1851  *   is capable of (eg. negotiating for an assumed minimum of 252ns instead of
1852  *   possible 200ns, which indeed shows up in tests as an approx. 10% lower
1853  *   transfer rate).
1854  */
1855 static inline unsigned int
1856 round_4(unsigned int x)
1857 {
1858         switch (x & 3) {
1859                 case 1: --x;
1860                         break;
1861                 case 2: ++x;
1862                 case 3: ++x;
1863         }
1864         return x;
1865 }
1866
1867 static void
1868 calc_sx_table(unsigned int mhz, struct sx_period sx_table[9])
1869 {
1870         unsigned int d, i;
1871         if (mhz < 11)
1872                 d = 2;  /* divisor for  8-10 MHz input-clock */
1873         else if (mhz < 16)
1874                 d = 3;  /* divisor for 12-15 MHz input-clock */
1875         else
1876                 d = 4;  /* divisor for 16-20 MHz input-clock */
1877
1878         d = (100000 * d) / 2 / mhz; /* 100 x DTCC / nanosec */
1879
1880         sx_table[0].period_ns = 1;
1881         sx_table[0].reg_value = 0x20;
1882         for (i = 1; i < 8; i++) {
1883                 sx_table[i].period_ns = round_4((i+1)*d / 100);
1884                 sx_table[i].reg_value = (i+1)*0x10;
1885         }
1886         sx_table[7].reg_value = 0;
1887         sx_table[8].period_ns = 0;
1888         sx_table[8].reg_value = 0;
1889 }
1890
1891 /*
1892  * check and, maybe, map an init- or "clock:"- argument.
1893  */
1894 static uchar
1895 set_clk_freq(int freq, int *mhz)
1896 {
1897         int x = freq;
1898         if (WD33C93_FS_8_10 == freq)
1899                 freq = 8;
1900         else if (WD33C93_FS_12_15 == freq)
1901                 freq = 12;
1902         else if (WD33C93_FS_16_20 == freq)
1903                 freq = 16;
1904         else if (freq > 7 && freq < 11)
1905                 x = WD33C93_FS_8_10;
1906                 else if (freq > 11 && freq < 16)
1907                 x = WD33C93_FS_12_15;
1908                 else if (freq > 15 && freq < 21)
1909                 x = WD33C93_FS_16_20;
1910         else {
1911                         /* Hmm, wouldn't it be safer to assume highest freq here? */
1912                 x = WD33C93_FS_8_10;
1913                 freq = 8;
1914         }
1915         *mhz = freq;
1916         return x;
1917 }
1918
1919 /*
1920  * to be used with the resync: fast: ... options
1921  */
1922 static inline void set_resync ( struct WD33C93_hostdata *hd, int mask )
1923 {
1924         int i;
1925         for (i = 0; i < 8; i++)
1926                 if (mask & (1 << i))
1927                         hd->sync_stat[i] = SS_UNSET;
1928 }
1929
1930 void
1931 wd33c93_init(struct Scsi_Host *instance, const wd33c93_regs regs,
1932              dma_setup_t setup, dma_stop_t stop, int clock_freq)
1933 {
1934         struct WD33C93_hostdata *hostdata;
1935         int i;
1936         int flags;
1937         int val;
1938         char buf[32];
1939
1940         if (!done_setup && setup_strings)
1941                 wd33c93_setup(setup_strings);
1942
1943         hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1944
1945         hostdata->regs = regs;
1946         hostdata->clock_freq = set_clk_freq(clock_freq, &i);
1947         calc_sx_table(i, hostdata->sx_table);
1948         hostdata->dma_setup = setup;
1949         hostdata->dma_stop = stop;
1950         hostdata->dma_bounce_buffer = NULL;
1951         hostdata->dma_bounce_len = 0;
1952         for (i = 0; i < 8; i++) {
1953                 hostdata->busy[i] = 0;
1954                 hostdata->sync_xfer[i] =
1955                         calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF,
1956                                         0, hostdata->sx_table);
1957                 hostdata->sync_stat[i] = SS_UNSET;      /* using default sync values */
1958 #ifdef PROC_STATISTICS
1959                 hostdata->cmd_cnt[i] = 0;
1960                 hostdata->disc_allowed_cnt[i] = 0;
1961                 hostdata->disc_done_cnt[i] = 0;
1962 #endif
1963         }
1964         hostdata->input_Q = NULL;
1965         hostdata->selecting = NULL;
1966         hostdata->connected = NULL;
1967         hostdata->disconnected_Q = NULL;
1968         hostdata->state = S_UNCONNECTED;
1969         hostdata->dma = D_DMA_OFF;
1970         hostdata->level2 = L2_BASIC;
1971         hostdata->disconnect = DIS_ADAPTIVE;
1972         hostdata->args = DEBUG_DEFAULTS;
1973         hostdata->incoming_ptr = 0;
1974         hostdata->outgoing_len = 0;
1975         hostdata->default_sx_per = DEFAULT_SX_PER;
1976         hostdata->no_sync = 0xff;       /* sync defaults to off */
1977         hostdata->no_dma = 0;   /* default is DMA enabled */
1978         hostdata->fast = 0;     /* default is Fast SCSI transfers disabled */
1979         hostdata->dma_mode = CTRL_DMA;  /* default is Single Byte DMA */
1980
1981 #ifdef PROC_INTERFACE
1982         hostdata->proc = PR_VERSION | PR_INFO | PR_STATISTICS |
1983             PR_CONNECTED | PR_INPUTQ | PR_DISCQ | PR_STOP;
1984 #ifdef PROC_STATISTICS
1985         hostdata->dma_cnt = 0;
1986         hostdata->pio_cnt = 0;
1987         hostdata->int_cnt = 0;
1988 #endif
1989 #endif
1990
1991         if (check_setup_args("clock", &flags, &val, buf)) {
1992                 hostdata->clock_freq = set_clk_freq(val, &val);
1993                 calc_sx_table(val, hostdata->sx_table);
1994         }
1995
1996         if (check_setup_args("nosync", &flags, &val, buf))
1997                 hostdata->no_sync = val;
1998
1999         if (check_setup_args("nodma", &flags, &val, buf))
2000                 hostdata->no_dma = (val == -1) ? 1 : val;
2001
2002         if (check_setup_args("period", &flags, &val, buf))
2003                 hostdata->default_sx_per =
2004                     hostdata->sx_table[round_period((unsigned int) val,
2005                                                     hostdata->sx_table)].period_ns;
2006
2007         if (check_setup_args("disconnect", &flags, &val, buf)) {
2008                 if ((val >= DIS_NEVER) && (val <= DIS_ALWAYS))
2009                         hostdata->disconnect = val;
2010                 else
2011                         hostdata->disconnect = DIS_ADAPTIVE;
2012         }
2013
2014         if (check_setup_args("level2", &flags, &val, buf))
2015                 hostdata->level2 = val;
2016
2017         if (check_setup_args("debug", &flags, &val, buf))
2018                 hostdata->args = val & DB_MASK;
2019
2020         if (check_setup_args("burst", &flags, &val, buf))
2021                 hostdata->dma_mode = val ? CTRL_BURST:CTRL_DMA;
2022
2023         if (WD33C93_FS_16_20 == hostdata->clock_freq /* divisor 4 */
2024                 && check_setup_args("fast", &flags, &val, buf))
2025                 hostdata->fast = !!val;
2026
2027         if ((i = check_setup_args("next", &flags, &val, buf))) {
2028                 while (i)
2029                         setup_used[--i] = 1;
2030         }
2031 #ifdef PROC_INTERFACE
2032         if (check_setup_args("proc", &flags, &val, buf))
2033                 hostdata->proc = val;
2034 #endif
2035
2036         spin_lock_irq(&hostdata->lock);
2037         reset_wd33c93(instance);
2038         spin_unlock_irq(&hostdata->lock);
2039
2040         printk("wd33c93-%d: chip=%s/%d no_sync=0x%x no_dma=%d",
2041                instance->host_no,
2042                (hostdata->chip == C_WD33C93) ? "WD33c93" : (hostdata->chip ==
2043                                                             C_WD33C93A) ?
2044                "WD33c93A" : (hostdata->chip ==
2045                              C_WD33C93B) ? "WD33c93B" : "unknown",
2046                hostdata->microcode, hostdata->no_sync, hostdata->no_dma);
2047 #ifdef DEBUGGING_ON
2048         printk(" debug_flags=0x%02x\n", hostdata->args);
2049 #else
2050         printk(" debugging=OFF\n");
2051 #endif
2052         printk("           setup_args=");
2053         for (i = 0; i < MAX_SETUP_ARGS; i++)
2054                 printk("%s,", setup_args[i]);
2055         printk("\n");
2056         printk("           Version %s - %s, Compiled %s at %s\n",
2057                WD33C93_VERSION, WD33C93_DATE, __DATE__, __TIME__);
2058 }
2059
2060 int
2061 wd33c93_proc_info(struct Scsi_Host *instance, char *buf, char **start, off_t off, int len, int in)
2062 {
2063
2064 #ifdef PROC_INTERFACE
2065
2066         char *bp;
2067         char tbuf[128];
2068         struct WD33C93_hostdata *hd;
2069         struct scsi_cmnd *cmd;
2070         int x;
2071         static int stop = 0;
2072
2073         hd = (struct WD33C93_hostdata *) instance->hostdata;
2074
2075 /* If 'in' is TRUE we need to _read_ the proc file. We accept the following
2076  * keywords (same format as command-line, but arguments are not optional):
2077  *    debug
2078  *    disconnect
2079  *    period
2080  *    resync
2081  *    proc
2082  *    nodma
2083  *    level2
2084  *    burst
2085  *    fast
2086  *    nosync
2087  */
2088
2089         if (in) {
2090                 buf[len] = '\0';
2091                 for (bp = buf; *bp; ) {
2092                         while (',' == *bp || ' ' == *bp)
2093                                 ++bp;
2094                 if (!strncmp(bp, "debug:", 6)) {
2095                                 hd->args = simple_strtoul(bp+6, &bp, 0) & DB_MASK;
2096                 } else if (!strncmp(bp, "disconnect:", 11)) {
2097                                 x = simple_strtoul(bp+11, &bp, 0);
2098                         if (x < DIS_NEVER || x > DIS_ALWAYS)
2099                                 x = DIS_ADAPTIVE;
2100                         hd->disconnect = x;
2101                 } else if (!strncmp(bp, "period:", 7)) {
2102                         x = simple_strtoul(bp+7, &bp, 0);
2103                         hd->default_sx_per =
2104                                 hd->sx_table[round_period((unsigned int) x,
2105                                                           hd->sx_table)].period_ns;
2106                 } else if (!strncmp(bp, "resync:", 7)) {
2107                                 set_resync(hd, (int)simple_strtoul(bp+7, &bp, 0));
2108                 } else if (!strncmp(bp, "proc:", 5)) {
2109                                 hd->proc = simple_strtoul(bp+5, &bp, 0);
2110                 } else if (!strncmp(bp, "nodma:", 6)) {
2111                                 hd->no_dma = simple_strtoul(bp+6, &bp, 0);
2112                 } else if (!strncmp(bp, "level2:", 7)) {
2113                                 hd->level2 = simple_strtoul(bp+7, &bp, 0);
2114                         } else if (!strncmp(bp, "burst:", 6)) {
2115                                 hd->dma_mode =
2116                                         simple_strtol(bp+6, &bp, 0) ? CTRL_BURST:CTRL_DMA;
2117                         } else if (!strncmp(bp, "fast:", 5)) {
2118                                 x = !!simple_strtol(bp+5, &bp, 0);
2119                                 if (x != hd->fast)
2120                                         set_resync(hd, 0xff);
2121                                 hd->fast = x;
2122                         } else if (!strncmp(bp, "nosync:", 7)) {
2123                                 x = simple_strtoul(bp+7, &bp, 0);
2124                                 set_resync(hd, x ^ hd->no_sync);
2125                                 hd->no_sync = x;
2126                         } else {
2127                                 break; /* unknown keyword,syntax-error,... */
2128                         }
2129                 }
2130                 return len;
2131         }
2132
2133         spin_lock_irq(&hd->lock);
2134         bp = buf;
2135         *bp = '\0';
2136         if (hd->proc & PR_VERSION) {
2137                 sprintf(tbuf, "\nVersion %s - %s. Compiled %s %s",
2138                         WD33C93_VERSION, WD33C93_DATE, __DATE__, __TIME__);
2139                 strcat(bp, tbuf);
2140         }
2141         if (hd->proc & PR_INFO) {
2142                 sprintf(tbuf, "\nclock_freq=%02x no_sync=%02x no_dma=%d"
2143                         " dma_mode=%02x fast=%d",
2144                         hd->clock_freq, hd->no_sync, hd->no_dma, hd->dma_mode, hd->fast);
2145                 strcat(bp, tbuf);
2146                 strcat(bp, "\nsync_xfer[] =       ");
2147                 for (x = 0; x < 7; x++) {
2148                         sprintf(tbuf, "\t%02x", hd->sync_xfer[x]);
2149                         strcat(bp, tbuf);
2150                 }
2151                 strcat(bp, "\nsync_stat[] =       ");
2152                 for (x = 0; x < 7; x++) {
2153                         sprintf(tbuf, "\t%02x", hd->sync_stat[x]);
2154                         strcat(bp, tbuf);
2155                 }
2156         }
2157 #ifdef PROC_STATISTICS
2158         if (hd->proc & PR_STATISTICS) {
2159                 strcat(bp, "\ncommands issued:    ");
2160                 for (x = 0; x < 7; x++) {
2161                         sprintf(tbuf, "\t%ld", hd->cmd_cnt[x]);
2162                         strcat(bp, tbuf);
2163                 }
2164                 strcat(bp, "\ndisconnects allowed:");
2165                 for (x = 0; x < 7; x++) {
2166                         sprintf(tbuf, "\t%ld", hd->disc_allowed_cnt[x]);
2167                         strcat(bp, tbuf);
2168                 }
2169                 strcat(bp, "\ndisconnects done:   ");
2170                 for (x = 0; x < 7; x++) {
2171                         sprintf(tbuf, "\t%ld", hd->disc_done_cnt[x]);
2172                         strcat(bp, tbuf);
2173                 }
2174                 sprintf(tbuf,
2175                         "\ninterrupts: %ld, DATA_PHASE ints: %ld DMA, %ld PIO",
2176                         hd->int_cnt, hd->dma_cnt, hd->pio_cnt);
2177                 strcat(bp, tbuf);
2178         }
2179 #endif
2180         if (hd->proc & PR_CONNECTED) {
2181                 strcat(bp, "\nconnected:     ");
2182                 if (hd->connected) {
2183                         cmd = (struct scsi_cmnd *) hd->connected;
2184                         sprintf(tbuf, " %ld-%d:%d(%02x)",
2185                                 cmd->serial_number, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2186                         strcat(bp, tbuf);
2187                 }
2188         }
2189         if (hd->proc & PR_INPUTQ) {
2190                 strcat(bp, "\ninput_Q:       ");
2191                 cmd = (struct scsi_cmnd *) hd->input_Q;
2192                 while (cmd) {
2193                         sprintf(tbuf, " %ld-%d:%d(%02x)",
2194                                 cmd->serial_number, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2195                         strcat(bp, tbuf);
2196                         cmd = (struct scsi_cmnd *) cmd->host_scribble;
2197                 }
2198         }
2199         if (hd->proc & PR_DISCQ) {
2200                 strcat(bp, "\ndisconnected_Q:");
2201                 cmd = (struct scsi_cmnd *) hd->disconnected_Q;
2202                 while (cmd) {
2203                         sprintf(tbuf, " %ld-%d:%d(%02x)",
2204                                 cmd->serial_number, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2205                         strcat(bp, tbuf);
2206                         cmd = (struct scsi_cmnd *) cmd->host_scribble;
2207                 }
2208         }
2209         strcat(bp, "\n");
2210         spin_unlock_irq(&hd->lock);
2211         *start = buf;
2212         if (stop) {
2213                 stop = 0;
2214                 return 0;
2215         }
2216         if (off > 0x40000)      /* ALWAYS stop after 256k bytes have been read */
2217                 stop = 1;
2218         if (hd->proc & PR_STOP) /* stop every other time */
2219                 stop = 1;
2220         return strlen(bp);
2221
2222 #else                           /* PROC_INTERFACE */
2223
2224         return 0;
2225
2226 #endif                          /* PROC_INTERFACE */
2227
2228 }
2229
2230 void
2231 wd33c93_release(void)
2232 {
2233 }
2234
2235 EXPORT_SYMBOL(wd33c93_host_reset);
2236 EXPORT_SYMBOL(wd33c93_init);
2237 EXPORT_SYMBOL(wd33c93_release);
2238 EXPORT_SYMBOL(wd33c93_abort);
2239 EXPORT_SYMBOL(wd33c93_queuecommand);
2240 EXPORT_SYMBOL(wd33c93_intr);
2241 EXPORT_SYMBOL(wd33c93_proc_info);