Merge branch 'master'
[linux-2.6.git] / 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
74 #include <linux/config.h>
75 #include <linux/module.h>
76
77 #include <linux/sched.h>
78 #include <linux/string.h>
79 #include <linux/delay.h>
80 #include <linux/init.h>
81 #include <linux/blkdev.h>
82 #include <asm/irq.h>
83
84 #include <scsi/scsi.h>
85 #include <scsi/scsi_cmnd.h>
86 #include <scsi/scsi_device.h>
87 #include <scsi/scsi_host.h>
88
89 #include "wd33c93.h"
90
91
92 #define WD33C93_VERSION    "1.26"
93 #define WD33C93_DATE       "22/Feb/2003"
94
95 MODULE_AUTHOR("John Shifflett");
96 MODULE_DESCRIPTION("Generic WD33C93 SCSI driver");
97 MODULE_LICENSE("GPL");
98
99 /*
100  * 'setup_strings' is a single string used to pass operating parameters and
101  * settings from the kernel/module command-line to the driver. 'setup_args[]'
102  * is an array of strings that define the compile-time default values for
103  * these settings. If Linux boots with an amiboot or insmod command-line,
104  * those settings are combined with 'setup_args[]'. Note that amiboot
105  * command-lines are prefixed with "wd33c93=" while insmod uses a
106  * "setup_strings=" prefix. The driver recognizes the following keywords
107  * (lower case required) and arguments:
108  *
109  * -  nosync:bitmask -bitmask is a byte where the 1st 7 bits correspond with
110  *                    the 7 possible SCSI devices. Set a bit to negotiate for
111  *                    asynchronous transfers on that device. To maintain
112  *                    backwards compatibility, a command-line such as
113  *                    "wd33c93=255" will be automatically translated to
114  *                    "wd33c93=nosync:0xff".
115  * -  nodma:x        -x = 1 to disable DMA, x = 0 to enable it. Argument is
116  *                    optional - if not present, same as "nodma:1".
117  * -  period:ns      -ns is the minimum # of nanoseconds in a SCSI data transfer
118  *                    period. Default is 500; acceptable values are 250 - 1000.
119  * -  disconnect:x   -x = 0 to never allow disconnects, 2 to always allow them.
120  *                    x = 1 does 'adaptive' disconnects, which is the default
121  *                    and generally the best choice.
122  * -  debug:x        -If 'DEBUGGING_ON' is defined, x is a bit mask that causes
123  *                    various types of debug output to printed - see the DB_xxx
124  *                    defines in wd33c93.h
125  * -  clock:x        -x = clock input in MHz for WD33c93 chip. Normal values
126  *                    would be from 8 through 20. Default is 8.
127  * -  next           -No argument. Used to separate blocks of keywords when
128  *                    there's more than one host adapter in the system.
129  *
130  * Syntax Notes:
131  * -  Numeric arguments can be decimal or the '0x' form of hex notation. There
132  *    _must_ be a colon between a keyword and its numeric argument, with no
133  *    spaces.
134  * -  Keywords are separated by commas, no spaces, in the standard kernel
135  *    command-line manner.
136  * -  A keyword in the 'nth' comma-separated command-line member will overwrite
137  *    the 'nth' element of setup_args[]. A blank command-line member (in
138  *    other words, a comma with no preceding keyword) will _not_ overwrite
139  *    the corresponding setup_args[] element.
140  * -  If a keyword is used more than once, the first one applies to the first
141  *    SCSI host found, the second to the second card, etc, unless the 'next'
142  *    keyword is used to change the order.
143  *
144  * Some amiboot examples (for insmod, use 'setup_strings' instead of 'wd33c93'):
145  * -  wd33c93=nosync:255
146  * -  wd33c93=nodma
147  * -  wd33c93=nodma:1
148  * -  wd33c93=disconnect:2,nosync:0x08,period:250
149  * -  wd33c93=debug:0x1c
150  */
151
152 /* Normally, no defaults are specified */
153 static char *setup_args[] = { "", "", "", "", "", "", "", "", "" };
154
155 static char *setup_strings;
156 module_param(setup_strings, charp, 0);
157
158 static void wd33c93_execute(struct Scsi_Host *instance);
159
160 #ifdef CONFIG_WD33C93_PIO
161 static inline uchar
162 read_wd33c93(const wd33c93_regs regs, uchar reg_num)
163 {
164         uchar data;
165
166         outb(reg_num, regs.SASR);
167         data = inb(regs.SCMD);
168         return data;
169 }
170
171 static inline unsigned long
172 read_wd33c93_count(const wd33c93_regs regs)
173 {
174         unsigned long value;
175
176         outb(WD_TRANSFER_COUNT_MSB, regs.SASR);
177         value = inb(regs.SCMD) << 16;
178         value |= inb(regs.SCMD) << 8;
179         value |= inb(regs.SCMD);
180         return value;
181 }
182
183 static inline uchar
184 read_aux_stat(const wd33c93_regs regs)
185 {
186         return inb(regs.SASR);
187 }
188
189 static inline void
190 write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value)
191 {
192       outb(reg_num, regs.SASR);
193       outb(value, regs.SCMD);
194 }
195
196 static inline void
197 write_wd33c93_count(const wd33c93_regs regs, unsigned long value)
198 {
199         outb(WD_TRANSFER_COUNT_MSB, regs.SASR);
200         outb((value >> 16) & 0xff, regs.SCMD);
201         outb((value >> 8) & 0xff, regs.SCMD);
202         outb( value & 0xff, regs.SCMD);
203 }
204
205 #define write_wd33c93_cmd(regs, cmd) \
206         write_wd33c93((regs), WD_COMMAND, (cmd))
207
208 static inline void
209 write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[])
210 {
211         int i;
212
213         outb(WD_CDB_1, regs.SASR);
214         for (i=0; i<len; i++)
215                 outb(cmnd[i], regs.SCMD);
216 }
217
218 #else /* CONFIG_WD33C93_PIO */
219 static inline uchar
220 read_wd33c93(const wd33c93_regs regs, uchar reg_num)
221 {
222         *regs.SASR = reg_num;
223         mb();
224         return (*regs.SCMD);
225 }
226
227 static unsigned long
228 read_wd33c93_count(const wd33c93_regs regs)
229 {
230         unsigned long value;
231
232         *regs.SASR = WD_TRANSFER_COUNT_MSB;
233         mb();
234         value = *regs.SCMD << 16;
235         value |= *regs.SCMD << 8;
236         value |= *regs.SCMD;
237         mb();
238         return value;
239 }
240
241 static inline uchar
242 read_aux_stat(const wd33c93_regs regs)
243 {
244         return *regs.SASR;
245 }
246
247 static inline void
248 write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value)
249 {
250         *regs.SASR = reg_num;
251         mb();
252         *regs.SCMD = value;
253         mb();
254 }
255
256 static void
257 write_wd33c93_count(const wd33c93_regs regs, unsigned long value)
258 {
259         *regs.SASR = WD_TRANSFER_COUNT_MSB;
260         mb();
261         *regs.SCMD = value >> 16;
262         *regs.SCMD = value >> 8;
263         *regs.SCMD = value;
264         mb();
265 }
266
267 static inline void
268 write_wd33c93_cmd(const wd33c93_regs regs, uchar cmd)
269 {
270         *regs.SASR = WD_COMMAND;
271         mb();
272         *regs.SCMD = cmd;
273         mb();
274 }
275
276 static inline void
277 write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[])
278 {
279         int i;
280
281         *regs.SASR = WD_CDB_1;
282         for (i = 0; i < len; i++)
283                 *regs.SCMD = cmnd[i];
284 }
285 #endif /* CONFIG_WD33C93_PIO */
286
287 static inline uchar
288 read_1_byte(const wd33c93_regs regs)
289 {
290         uchar asr;
291         uchar x = 0;
292
293         write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
294         write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO | 0x80);
295         do {
296                 asr = read_aux_stat(regs);
297                 if (asr & ASR_DBR)
298                         x = read_wd33c93(regs, WD_DATA);
299         } while (!(asr & ASR_INT));
300         return x;
301 }
302
303 static struct sx_period sx_table[] = {
304         {1, 0x20},
305         {252, 0x20},
306         {376, 0x30},
307         {500, 0x40},
308         {624, 0x50},
309         {752, 0x60},
310         {876, 0x70},
311         {1000, 0x00},
312         {0, 0}
313 };
314
315 static int
316 round_period(unsigned int period)
317 {
318         int x;
319
320         for (x = 1; sx_table[x].period_ns; x++) {
321                 if ((period <= sx_table[x - 0].period_ns) &&
322                     (period > sx_table[x - 1].period_ns)) {
323                         return x;
324                 }
325         }
326         return 7;
327 }
328
329 static uchar
330 calc_sync_xfer(unsigned int period, unsigned int offset)
331 {
332         uchar result;
333
334         period *= 4;            /* convert SDTR code to ns */
335         result = sx_table[round_period(period)].reg_value;
336         result |= (offset < OPTIMUM_SX_OFF) ? offset : OPTIMUM_SX_OFF;
337         return result;
338 }
339
340 int
341 wd33c93_queuecommand(struct scsi_cmnd *cmd,
342                 void (*done)(struct scsi_cmnd *))
343 {
344         struct WD33C93_hostdata *hostdata;
345         struct scsi_cmnd *tmp;
346
347         hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata;
348
349         DB(DB_QUEUE_COMMAND,
350            printk("Q-%d-%02x-%ld( ", cmd->device->id, cmd->cmnd[0], cmd->pid))
351
352 /* Set up a few fields in the scsi_cmnd structure for our own use:
353  *  - host_scribble is the pointer to the next cmd in the input queue
354  *  - scsi_done points to the routine we call when a cmd is finished
355  *  - result is what you'd expect
356  */
357         cmd->host_scribble = NULL;
358         cmd->scsi_done = done;
359         cmd->result = 0;
360
361 /* We use the Scsi_Pointer structure that's included with each command
362  * as a scratchpad (as it's intended to be used!). The handy thing about
363  * the SCp.xxx fields is that they're always associated with a given
364  * cmd, and are preserved across disconnect-reselect. This means we
365  * can pretty much ignore SAVE_POINTERS and RESTORE_POINTERS messages
366  * if we keep all the critical pointers and counters in SCp:
367  *  - SCp.ptr is the pointer into the RAM buffer
368  *  - SCp.this_residual is the size of that buffer
369  *  - SCp.buffer points to the current scatter-gather buffer
370  *  - SCp.buffers_residual tells us how many S.G. buffers there are
371  *  - SCp.have_data_in is not used
372  *  - SCp.sent_command is not used
373  *  - SCp.phase records this command's SRCID_ER bit setting
374  */
375
376         if (cmd->use_sg) {
377                 cmd->SCp.buffer = (struct scatterlist *) cmd->buffer;
378                 cmd->SCp.buffers_residual = cmd->use_sg - 1;
379                 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page) +
380                     cmd->SCp.buffer->offset;
381                 cmd->SCp.this_residual = cmd->SCp.buffer->length;
382         } else {
383                 cmd->SCp.buffer = NULL;
384                 cmd->SCp.buffers_residual = 0;
385                 cmd->SCp.ptr = (char *) cmd->request_buffer;
386                 cmd->SCp.this_residual = cmd->request_bufflen;
387         }
388
389 /* WD docs state that at the conclusion of a "LEVEL2" command, the
390  * status byte can be retrieved from the LUN register. Apparently,
391  * this is the case only for *uninterrupted* LEVEL2 commands! If
392  * there are any unexpected phases entered, even if they are 100%
393  * legal (different devices may choose to do things differently),
394  * the LEVEL2 command sequence is exited. This often occurs prior
395  * to receiving the status byte, in which case the driver does a
396  * status phase interrupt and gets the status byte on its own.
397  * While such a command can then be "resumed" (ie restarted to
398  * finish up as a LEVEL2 command), the LUN register will NOT be
399  * a valid status byte at the command's conclusion, and we must
400  * use the byte obtained during the earlier interrupt. Here, we
401  * preset SCp.Status to an illegal value (0xff) so that when
402  * this command finally completes, we can tell where the actual
403  * status byte is stored.
404  */
405
406         cmd->SCp.Status = ILLEGAL_STATUS_BYTE;
407
408         /*
409          * Add the cmd to the end of 'input_Q'. Note that REQUEST SENSE
410          * commands are added to the head of the queue so that the desired
411          * sense data is not lost before REQUEST_SENSE executes.
412          */
413
414         spin_lock_irq(&hostdata->lock);
415
416         if (!(hostdata->input_Q) || (cmd->cmnd[0] == REQUEST_SENSE)) {
417                 cmd->host_scribble = (uchar *) hostdata->input_Q;
418                 hostdata->input_Q = cmd;
419         } else {                /* find the end of the queue */
420                 for (tmp = (struct scsi_cmnd *) hostdata->input_Q;
421                      tmp->host_scribble;
422                      tmp = (struct scsi_cmnd *) tmp->host_scribble) ;
423                 tmp->host_scribble = (uchar *) cmd;
424         }
425
426 /* We know that there's at least one command in 'input_Q' now.
427  * Go see if any of them are runnable!
428  */
429
430         wd33c93_execute(cmd->device->host);
431
432         DB(DB_QUEUE_COMMAND, printk(")Q-%ld ", cmd->pid))
433
434         spin_unlock_irq(&hostdata->lock);
435         return 0;
436 }
437
438 /*
439  * This routine attempts to start a scsi command. If the host_card is
440  * already connected, we give up immediately. Otherwise, look through
441  * the input_Q, using the first command we find that's intended
442  * for a currently non-busy target/lun.
443  *
444  * wd33c93_execute() is always called with interrupts disabled or from
445  * the wd33c93_intr itself, which means that a wd33c93 interrupt
446  * cannot occur while we are in here.
447  */
448 static void
449 wd33c93_execute(struct Scsi_Host *instance)
450 {
451         struct WD33C93_hostdata *hostdata =
452             (struct WD33C93_hostdata *) instance->hostdata;
453         const wd33c93_regs regs = hostdata->regs;
454         struct scsi_cmnd *cmd, *prev;
455
456         DB(DB_EXECUTE, printk("EX("))
457         if (hostdata->selecting || hostdata->connected) {
458                 DB(DB_EXECUTE, printk(")EX-0 "))
459                 return;
460         }
461
462         /*
463          * Search through the input_Q for a command destined
464          * for an idle target/lun.
465          */
466
467         cmd = (struct scsi_cmnd *) hostdata->input_Q;
468         prev = NULL;
469         while (cmd) {
470                 if (!(hostdata->busy[cmd->device->id] & (1 << cmd->device->lun)))
471                         break;
472                 prev = cmd;
473                 cmd = (struct scsi_cmnd *) cmd->host_scribble;
474         }
475
476         /* quit if queue empty or all possible targets are busy */
477
478         if (!cmd) {
479                 DB(DB_EXECUTE, printk(")EX-1 "))
480                 return;
481         }
482
483         /*  remove command from queue */
484
485         if (prev)
486                 prev->host_scribble = cmd->host_scribble;
487         else
488                 hostdata->input_Q = (struct scsi_cmnd *) cmd->host_scribble;
489
490 #ifdef PROC_STATISTICS
491         hostdata->cmd_cnt[cmd->device->id]++;
492 #endif
493
494         /*
495          * Start the selection process
496          */
497
498         if (cmd->sc_data_direction == DMA_TO_DEVICE)
499                 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);
500         else
501                 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id | DSTID_DPD);
502
503 /* Now we need to figure out whether or not this command is a good
504  * candidate for disconnect/reselect. We guess to the best of our
505  * ability, based on a set of hierarchical rules. When several
506  * devices are operating simultaneously, disconnects are usually
507  * an advantage. In a single device system, or if only 1 device
508  * is being accessed, transfers usually go faster if disconnects
509  * are not allowed:
510  *
511  * + Commands should NEVER disconnect if hostdata->disconnect =
512  *   DIS_NEVER (this holds for tape drives also), and ALWAYS
513  *   disconnect if hostdata->disconnect = DIS_ALWAYS.
514  * + Tape drive commands should always be allowed to disconnect.
515  * + Disconnect should be allowed if disconnected_Q isn't empty.
516  * + Commands should NOT disconnect if input_Q is empty.
517  * + Disconnect should be allowed if there are commands in input_Q
518  *   for a different target/lun. In this case, the other commands
519  *   should be made disconnect-able, if not already.
520  *
521  * I know, I know - this code would flunk me out of any
522  * "C Programming 101" class ever offered. But it's easy
523  * to change around and experiment with for now.
524  */
525
526         cmd->SCp.phase = 0;     /* assume no disconnect */
527         if (hostdata->disconnect == DIS_NEVER)
528                 goto no;
529         if (hostdata->disconnect == DIS_ALWAYS)
530                 goto yes;
531         if (cmd->device->type == 1)     /* tape drive? */
532                 goto yes;
533         if (hostdata->disconnected_Q)   /* other commands disconnected? */
534                 goto yes;
535         if (!(hostdata->input_Q))       /* input_Q empty? */
536                 goto no;
537         for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;
538              prev = (struct scsi_cmnd *) prev->host_scribble) {
539                 if ((prev->device->id != cmd->device->id) ||
540                     (prev->device->lun != cmd->device->lun)) {
541                         for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;
542                              prev = (struct scsi_cmnd *) prev->host_scribble)
543                                 prev->SCp.phase = 1;
544                         goto yes;
545                 }
546         }
547
548         goto no;
549
550  yes:
551         cmd->SCp.phase = 1;
552
553 #ifdef PROC_STATISTICS
554         hostdata->disc_allowed_cnt[cmd->device->id]++;
555 #endif
556
557  no:
558
559         write_wd33c93(regs, WD_SOURCE_ID, ((cmd->SCp.phase) ? SRCID_ER : 0));
560
561         write_wd33c93(regs, WD_TARGET_LUN, cmd->device->lun);
562         write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
563                       hostdata->sync_xfer[cmd->device->id]);
564         hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
565
566         if ((hostdata->level2 == L2_NONE) ||
567             (hostdata->sync_stat[cmd->device->id] == SS_UNSET)) {
568
569                 /*
570                  * Do a 'Select-With-ATN' command. This will end with
571                  * one of the following interrupts:
572                  *    CSR_RESEL_AM:  failure - can try again later.
573                  *    CSR_TIMEOUT:   failure - give up.
574                  *    CSR_SELECT:    success - proceed.
575                  */
576
577                 hostdata->selecting = cmd;
578
579 /* Every target has its own synchronous transfer setting, kept in the
580  * sync_xfer array, and a corresponding status byte in sync_stat[].
581  * Each target's sync_stat[] entry is initialized to SX_UNSET, and its
582  * sync_xfer[] entry is initialized to the default/safe value. SS_UNSET
583  * means that the parameters are undetermined as yet, and that we
584  * need to send an SDTR message to this device after selection is
585  * complete: We set SS_FIRST to tell the interrupt routine to do so.
586  * If we've been asked not to try synchronous transfers on this
587  * target (and _all_ luns within it), we'll still send the SDTR message
588  * later, but at that time we'll negotiate for async by specifying a
589  * sync fifo depth of 0.
590  */
591                 if (hostdata->sync_stat[cmd->device->id] == SS_UNSET)
592                         hostdata->sync_stat[cmd->device->id] = SS_FIRST;
593                 hostdata->state = S_SELECTING;
594                 write_wd33c93_count(regs, 0);   /* guarantee a DATA_PHASE interrupt */
595                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN);
596         } else {
597
598                 /*
599                  * Do a 'Select-With-ATN-Xfer' command. This will end with
600                  * one of the following interrupts:
601                  *    CSR_RESEL_AM:  failure - can try again later.
602                  *    CSR_TIMEOUT:   failure - give up.
603                  *    anything else: success - proceed.
604                  */
605
606                 hostdata->connected = cmd;
607                 write_wd33c93(regs, WD_COMMAND_PHASE, 0);
608
609                 /* copy command_descriptor_block into WD chip
610                  * (take advantage of auto-incrementing)
611                  */
612
613                 write_wd33c93_cdb(regs, cmd->cmd_len, cmd->cmnd);
614
615                 /* The wd33c93 only knows about Group 0, 1, and 5 commands when
616                  * it's doing a 'select-and-transfer'. To be safe, we write the
617                  * size of the CDB into the OWN_ID register for every case. This
618                  * way there won't be problems with vendor-unique, audio, etc.
619                  */
620
621                 write_wd33c93(regs, WD_OWN_ID, cmd->cmd_len);
622
623                 /* When doing a non-disconnect command with DMA, we can save
624                  * ourselves a DATA phase interrupt later by setting everything
625                  * up ahead of time.
626                  */
627
628                 if ((cmd->SCp.phase == 0) && (hostdata->no_dma == 0)) {
629                         if (hostdata->dma_setup(cmd,
630                             (cmd->sc_data_direction == DMA_TO_DEVICE) ?
631                              DATA_OUT_DIR : DATA_IN_DIR))
632                                 write_wd33c93_count(regs, 0);   /* guarantee a DATA_PHASE interrupt */
633                         else {
634                                 write_wd33c93_count(regs,
635                                                     cmd->SCp.this_residual);
636                                 write_wd33c93(regs, WD_CONTROL,
637                                               CTRL_IDI | CTRL_EDI | CTRL_DMA);
638                                 hostdata->dma = D_DMA_RUNNING;
639                         }
640                 } else
641                         write_wd33c93_count(regs, 0);   /* guarantee a DATA_PHASE interrupt */
642
643                 hostdata->state = S_RUNNING_LEVEL2;
644                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
645         }
646
647         /*
648          * Since the SCSI bus can handle only 1 connection at a time,
649          * we get out of here now. If the selection fails, or when
650          * the command disconnects, we'll come back to this routine
651          * to search the input_Q again...
652          */
653
654         DB(DB_EXECUTE,
655            printk("%s%ld)EX-2 ", (cmd->SCp.phase) ? "d:" : "", cmd->pid))
656 }
657
658 static void
659 transfer_pio(const wd33c93_regs regs, uchar * buf, int cnt,
660              int data_in_dir, struct WD33C93_hostdata *hostdata)
661 {
662         uchar asr;
663
664         DB(DB_TRANSFER,
665            printk("(%p,%d,%s:", buf, cnt, data_in_dir ? "in" : "out"))
666
667         write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
668         write_wd33c93_count(regs, cnt);
669         write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
670         if (data_in_dir) {
671                 do {
672                         asr = read_aux_stat(regs);
673                         if (asr & ASR_DBR)
674                                 *buf++ = read_wd33c93(regs, WD_DATA);
675                 } while (!(asr & ASR_INT));
676         } else {
677                 do {
678                         asr = read_aux_stat(regs);
679                         if (asr & ASR_DBR)
680                                 write_wd33c93(regs, WD_DATA, *buf++);
681                 } while (!(asr & ASR_INT));
682         }
683
684         /* Note: we are returning with the interrupt UN-cleared.
685          * Since (presumably) an entire I/O operation has
686          * completed, the bus phase is probably different, and
687          * the interrupt routine will discover this when it
688          * responds to the uncleared int.
689          */
690
691 }
692
693 static void
694 transfer_bytes(const wd33c93_regs regs, struct scsi_cmnd *cmd,
695                 int data_in_dir)
696 {
697         struct WD33C93_hostdata *hostdata;
698         unsigned long length;
699
700         hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata;
701
702 /* Normally, you'd expect 'this_residual' to be non-zero here.
703  * In a series of scatter-gather transfers, however, this
704  * routine will usually be called with 'this_residual' equal
705  * to 0 and 'buffers_residual' non-zero. This means that a
706  * previous transfer completed, clearing 'this_residual', and
707  * now we need to setup the next scatter-gather buffer as the
708  * source or destination for THIS transfer.
709  */
710         if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
711                 ++cmd->SCp.buffer;
712                 --cmd->SCp.buffers_residual;
713                 cmd->SCp.this_residual = cmd->SCp.buffer->length;
714                 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page) +
715                     cmd->SCp.buffer->offset;
716         }
717
718         write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
719                       hostdata->sync_xfer[cmd->device->id]);
720
721 /* 'hostdata->no_dma' is TRUE if we don't even want to try DMA.
722  * Update 'this_residual' and 'ptr' after 'transfer_pio()' returns.
723  */
724
725         if (hostdata->no_dma || hostdata->dma_setup(cmd, data_in_dir)) {
726 #ifdef PROC_STATISTICS
727                 hostdata->pio_cnt++;
728 #endif
729                 transfer_pio(regs, (uchar *) cmd->SCp.ptr,
730                              cmd->SCp.this_residual, data_in_dir, hostdata);
731                 length = cmd->SCp.this_residual;
732                 cmd->SCp.this_residual = read_wd33c93_count(regs);
733                 cmd->SCp.ptr += (length - cmd->SCp.this_residual);
734         }
735
736 /* We are able to do DMA (in fact, the Amiga hardware is
737  * already going!), so start up the wd33c93 in DMA mode.
738  * We set 'hostdata->dma' = D_DMA_RUNNING so that when the
739  * transfer completes and causes an interrupt, we're
740  * reminded to tell the Amiga to shut down its end. We'll
741  * postpone the updating of 'this_residual' and 'ptr'
742  * until then.
743  */
744
745         else {
746 #ifdef PROC_STATISTICS
747                 hostdata->dma_cnt++;
748 #endif
749                 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_DMA);
750                 write_wd33c93_count(regs, cmd->SCp.this_residual);
751
752                 if ((hostdata->level2 >= L2_DATA) ||
753                     (hostdata->level2 == L2_BASIC && cmd->SCp.phase == 0)) {
754                         write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
755                         write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
756                         hostdata->state = S_RUNNING_LEVEL2;
757                 } else
758                         write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
759
760                 hostdata->dma = D_DMA_RUNNING;
761         }
762 }
763
764 void
765 wd33c93_intr(struct Scsi_Host *instance)
766 {
767         struct WD33C93_hostdata *hostdata =
768             (struct WD33C93_hostdata *) instance->hostdata;
769         const wd33c93_regs regs = hostdata->regs;
770         struct scsi_cmnd *patch, *cmd;
771         uchar asr, sr, phs, id, lun, *ucp, msg;
772         unsigned long length, flags;
773
774         asr = read_aux_stat(regs);
775         if (!(asr & ASR_INT) || (asr & ASR_BSY))
776                 return;
777
778         spin_lock_irqsave(&hostdata->lock, flags);
779
780 #ifdef PROC_STATISTICS
781         hostdata->int_cnt++;
782 #endif
783
784         cmd = (struct scsi_cmnd *) hostdata->connected; /* assume we're connected */
785         sr = read_wd33c93(regs, WD_SCSI_STATUS);        /* clear the interrupt */
786         phs = read_wd33c93(regs, WD_COMMAND_PHASE);
787
788         DB(DB_INTR, printk("{%02x:%02x-", asr, sr))
789
790 /* After starting a DMA transfer, the next interrupt
791  * is guaranteed to be in response to completion of
792  * the transfer. Since the Amiga DMA hardware runs in
793  * in an open-ended fashion, it needs to be told when
794  * to stop; do that here if D_DMA_RUNNING is true.
795  * Also, we have to update 'this_residual' and 'ptr'
796  * based on the contents of the TRANSFER_COUNT register,
797  * in case the device decided to do an intermediate
798  * disconnect (a device may do this if it has to do a
799  * seek, or just to be nice and let other devices have
800  * some bus time during long transfers). After doing
801  * whatever is needed, we go on and service the WD3393
802  * interrupt normally.
803  */
804             if (hostdata->dma == D_DMA_RUNNING) {
805                 DB(DB_TRANSFER,
806                    printk("[%p/%d:", cmd->SCp.ptr, cmd->SCp.this_residual))
807                     hostdata->dma_stop(cmd->device->host, cmd, 1);
808                 hostdata->dma = D_DMA_OFF;
809                 length = cmd->SCp.this_residual;
810                 cmd->SCp.this_residual = read_wd33c93_count(regs);
811                 cmd->SCp.ptr += (length - cmd->SCp.this_residual);
812                 DB(DB_TRANSFER,
813                    printk("%p/%d]", cmd->SCp.ptr, cmd->SCp.this_residual))
814         }
815
816 /* Respond to the specific WD3393 interrupt - there are quite a few! */
817         switch (sr) {
818         case CSR_TIMEOUT:
819                 DB(DB_INTR, printk("TIMEOUT"))
820
821                     if (hostdata->state == S_RUNNING_LEVEL2)
822                         hostdata->connected = NULL;
823                 else {
824                         cmd = (struct scsi_cmnd *) hostdata->selecting; /* get a valid cmd */
825                         hostdata->selecting = NULL;
826                 }
827
828                 cmd->result = DID_NO_CONNECT << 16;
829                 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
830                 hostdata->state = S_UNCONNECTED;
831                 cmd->scsi_done(cmd);
832
833                 /* From esp.c:
834                  * There is a window of time within the scsi_done() path
835                  * of execution where interrupts are turned back on full
836                  * blast and left that way.  During that time we could
837                  * reconnect to a disconnected command, then we'd bomb
838                  * out below.  We could also end up executing two commands
839                  * at _once_.  ...just so you know why the restore_flags()
840                  * is here...
841                  */
842
843                 spin_unlock_irqrestore(&hostdata->lock, flags);
844
845 /* We are not connected to a target - check to see if there
846  * are commands waiting to be executed.
847  */
848
849                 wd33c93_execute(instance);
850                 break;
851
852 /* Note: this interrupt should not occur in a LEVEL2 command */
853
854         case CSR_SELECT:
855                 DB(DB_INTR, printk("SELECT"))
856                     hostdata->connected = cmd =
857                     (struct scsi_cmnd *) hostdata->selecting;
858                 hostdata->selecting = NULL;
859
860                 /* construct an IDENTIFY message with correct disconnect bit */
861
862                 hostdata->outgoing_msg[0] = (0x80 | 0x00 | cmd->device->lun);
863                 if (cmd->SCp.phase)
864                         hostdata->outgoing_msg[0] |= 0x40;
865
866                 if (hostdata->sync_stat[cmd->device->id] == SS_FIRST) {
867 #ifdef SYNC_DEBUG
868                         printk(" sending SDTR ");
869 #endif
870
871                         hostdata->sync_stat[cmd->device->id] = SS_WAITING;
872
873 /* Tack on a 2nd message to ask about synchronous transfers. If we've
874  * been asked to do only asynchronous transfers on this device, we
875  * request a fifo depth of 0, which is equivalent to async - should
876  * solve the problems some people have had with GVP's Guru ROM.
877  */
878
879                         hostdata->outgoing_msg[1] = EXTENDED_MESSAGE;
880                         hostdata->outgoing_msg[2] = 3;
881                         hostdata->outgoing_msg[3] = EXTENDED_SDTR;
882                         if (hostdata->no_sync & (1 << cmd->device->id)) {
883                                 hostdata->outgoing_msg[4] =
884                                     hostdata->default_sx_per / 4;
885                                 hostdata->outgoing_msg[5] = 0;
886                         } else {
887                                 hostdata->outgoing_msg[4] = OPTIMUM_SX_PER / 4;
888                                 hostdata->outgoing_msg[5] = OPTIMUM_SX_OFF;
889                         }
890                         hostdata->outgoing_len = 6;
891                 } else
892                         hostdata->outgoing_len = 1;
893
894                 hostdata->state = S_CONNECTED;
895                 spin_unlock_irqrestore(&hostdata->lock, flags);
896                 break;
897
898         case CSR_XFER_DONE | PHS_DATA_IN:
899         case CSR_UNEXP | PHS_DATA_IN:
900         case CSR_SRV_REQ | PHS_DATA_IN:
901                 DB(DB_INTR,
902                    printk("IN-%d.%d", cmd->SCp.this_residual,
903                           cmd->SCp.buffers_residual))
904                     transfer_bytes(regs, cmd, DATA_IN_DIR);
905                 if (hostdata->state != S_RUNNING_LEVEL2)
906                         hostdata->state = S_CONNECTED;
907                 spin_unlock_irqrestore(&hostdata->lock, flags);
908                 break;
909
910         case CSR_XFER_DONE | PHS_DATA_OUT:
911         case CSR_UNEXP | PHS_DATA_OUT:
912         case CSR_SRV_REQ | PHS_DATA_OUT:
913                 DB(DB_INTR,
914                    printk("OUT-%d.%d", cmd->SCp.this_residual,
915                           cmd->SCp.buffers_residual))
916                     transfer_bytes(regs, cmd, DATA_OUT_DIR);
917                 if (hostdata->state != S_RUNNING_LEVEL2)
918                         hostdata->state = S_CONNECTED;
919                 spin_unlock_irqrestore(&hostdata->lock, flags);
920                 break;
921
922 /* Note: this interrupt should not occur in a LEVEL2 command */
923
924         case CSR_XFER_DONE | PHS_COMMAND:
925         case CSR_UNEXP | PHS_COMMAND:
926         case CSR_SRV_REQ | PHS_COMMAND:
927                 DB(DB_INTR, printk("CMND-%02x,%ld", cmd->cmnd[0], cmd->pid))
928                     transfer_pio(regs, cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR,
929                                  hostdata);
930                 hostdata->state = S_CONNECTED;
931                 spin_unlock_irqrestore(&hostdata->lock, flags);
932                 break;
933
934         case CSR_XFER_DONE | PHS_STATUS:
935         case CSR_UNEXP | PHS_STATUS:
936         case CSR_SRV_REQ | PHS_STATUS:
937                 DB(DB_INTR, printk("STATUS="))
938                 cmd->SCp.Status = read_1_byte(regs);
939                 DB(DB_INTR, printk("%02x", cmd->SCp.Status))
940                     if (hostdata->level2 >= L2_BASIC) {
941                         sr = read_wd33c93(regs, WD_SCSI_STATUS);        /* clear interrupt */
942                         hostdata->state = S_RUNNING_LEVEL2;
943                         write_wd33c93(regs, WD_COMMAND_PHASE, 0x50);
944                         write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
945                 } else {
946                         hostdata->state = S_CONNECTED;
947                 }
948                 spin_unlock_irqrestore(&hostdata->lock, flags);
949                 break;
950
951         case CSR_XFER_DONE | PHS_MESS_IN:
952         case CSR_UNEXP | PHS_MESS_IN:
953         case CSR_SRV_REQ | PHS_MESS_IN:
954                 DB(DB_INTR, printk("MSG_IN="))
955
956                 msg = read_1_byte(regs);
957                 sr = read_wd33c93(regs, WD_SCSI_STATUS);        /* clear interrupt */
958
959                 hostdata->incoming_msg[hostdata->incoming_ptr] = msg;
960                 if (hostdata->incoming_msg[0] == EXTENDED_MESSAGE)
961                         msg = EXTENDED_MESSAGE;
962                 else
963                         hostdata->incoming_ptr = 0;
964
965                 cmd->SCp.Message = msg;
966                 switch (msg) {
967
968                 case COMMAND_COMPLETE:
969                         DB(DB_INTR, printk("CCMP-%ld", cmd->pid))
970                             write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
971                         hostdata->state = S_PRE_CMP_DISC;
972                         break;
973
974                 case SAVE_POINTERS:
975                         DB(DB_INTR, printk("SDP"))
976                             write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
977                         hostdata->state = S_CONNECTED;
978                         break;
979
980                 case RESTORE_POINTERS:
981                         DB(DB_INTR, printk("RDP"))
982                             if (hostdata->level2 >= L2_BASIC) {
983                                 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
984                                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
985                                 hostdata->state = S_RUNNING_LEVEL2;
986                         } else {
987                                 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
988                                 hostdata->state = S_CONNECTED;
989                         }
990                         break;
991
992                 case DISCONNECT:
993                         DB(DB_INTR, printk("DIS"))
994                             cmd->device->disconnect = 1;
995                         write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
996                         hostdata->state = S_PRE_TMP_DISC;
997                         break;
998
999                 case MESSAGE_REJECT:
1000                         DB(DB_INTR, printk("REJ"))
1001 #ifdef SYNC_DEBUG
1002                             printk("-REJ-");
1003 #endif
1004                         if (hostdata->sync_stat[cmd->device->id] == SS_WAITING)
1005                                 hostdata->sync_stat[cmd->device->id] = SS_SET;
1006                         write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1007                         hostdata->state = S_CONNECTED;
1008                         break;
1009
1010                 case EXTENDED_MESSAGE:
1011                         DB(DB_INTR, printk("EXT"))
1012
1013                             ucp = hostdata->incoming_msg;
1014
1015 #ifdef SYNC_DEBUG
1016                         printk("%02x", ucp[hostdata->incoming_ptr]);
1017 #endif
1018                         /* Is this the last byte of the extended message? */
1019
1020                         if ((hostdata->incoming_ptr >= 2) &&
1021                             (hostdata->incoming_ptr == (ucp[1] + 1))) {
1022
1023                                 switch (ucp[2]) {       /* what's the EXTENDED code? */
1024                                 case EXTENDED_SDTR:
1025                                         id = calc_sync_xfer(ucp[3], ucp[4]);
1026                                         if (hostdata->sync_stat[cmd->device->id] !=
1027                                             SS_WAITING) {
1028
1029 /* A device has sent an unsolicited SDTR message; rather than go
1030  * through the effort of decoding it and then figuring out what
1031  * our reply should be, we're just gonna say that we have a
1032  * synchronous fifo depth of 0. This will result in asynchronous
1033  * transfers - not ideal but so much easier.
1034  * Actually, this is OK because it assures us that if we don't
1035  * specifically ask for sync transfers, we won't do any.
1036  */
1037
1038                                                 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1039                                                 hostdata->outgoing_msg[0] =
1040                                                     EXTENDED_MESSAGE;
1041                                                 hostdata->outgoing_msg[1] = 3;
1042                                                 hostdata->outgoing_msg[2] =
1043                                                     EXTENDED_SDTR;
1044                                                 hostdata->outgoing_msg[3] =
1045                                                     hostdata->default_sx_per /
1046                                                     4;
1047                                                 hostdata->outgoing_msg[4] = 0;
1048                                                 hostdata->outgoing_len = 5;
1049                                                 hostdata->sync_xfer[cmd->device->id] =
1050                                                     calc_sync_xfer(hostdata->
1051                                                                    default_sx_per
1052                                                                    / 4, 0);
1053                                         } else {
1054                                                 hostdata->sync_xfer[cmd->device->id] = id;
1055                                         }
1056 #ifdef SYNC_DEBUG
1057                                         printk("sync_xfer=%02x",
1058                                                hostdata->sync_xfer[cmd->device->id]);
1059 #endif
1060                                         hostdata->sync_stat[cmd->device->id] =
1061                                             SS_SET;
1062                                         write_wd33c93_cmd(regs,
1063                                                           WD_CMD_NEGATE_ACK);
1064                                         hostdata->state = S_CONNECTED;
1065                                         break;
1066                                 case EXTENDED_WDTR:
1067                                         write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1068                                         printk("sending WDTR ");
1069                                         hostdata->outgoing_msg[0] =
1070                                             EXTENDED_MESSAGE;
1071                                         hostdata->outgoing_msg[1] = 2;
1072                                         hostdata->outgoing_msg[2] =
1073                                             EXTENDED_WDTR;
1074                                         hostdata->outgoing_msg[3] = 0;  /* 8 bit transfer width */
1075                                         hostdata->outgoing_len = 4;
1076                                         write_wd33c93_cmd(regs,
1077                                                           WD_CMD_NEGATE_ACK);
1078                                         hostdata->state = S_CONNECTED;
1079                                         break;
1080                                 default:
1081                                         write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1082                                         printk
1083                                             ("Rejecting Unknown Extended Message(%02x). ",
1084                                              ucp[2]);
1085                                         hostdata->outgoing_msg[0] =
1086                                             MESSAGE_REJECT;
1087                                         hostdata->outgoing_len = 1;
1088                                         write_wd33c93_cmd(regs,
1089                                                           WD_CMD_NEGATE_ACK);
1090                                         hostdata->state = S_CONNECTED;
1091                                         break;
1092                                 }
1093                                 hostdata->incoming_ptr = 0;
1094                         }
1095
1096                         /* We need to read more MESS_IN bytes for the extended message */
1097
1098                         else {
1099                                 hostdata->incoming_ptr++;
1100                                 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1101                                 hostdata->state = S_CONNECTED;
1102                         }
1103                         break;
1104
1105                 default:
1106                         printk("Rejecting Unknown Message(%02x) ", msg);
1107                         write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1108                         hostdata->outgoing_msg[0] = MESSAGE_REJECT;
1109                         hostdata->outgoing_len = 1;
1110                         write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1111                         hostdata->state = S_CONNECTED;
1112                 }
1113                 spin_unlock_irqrestore(&hostdata->lock, flags);
1114                 break;
1115
1116 /* Note: this interrupt will occur only after a LEVEL2 command */
1117
1118         case CSR_SEL_XFER_DONE:
1119
1120 /* Make sure that reselection is enabled at this point - it may
1121  * have been turned off for the command that just completed.
1122  */
1123
1124                 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1125                 if (phs == 0x60) {
1126                         DB(DB_INTR, printk("SX-DONE-%ld", cmd->pid))
1127                             cmd->SCp.Message = COMMAND_COMPLETE;
1128                         lun = read_wd33c93(regs, WD_TARGET_LUN);
1129                         DB(DB_INTR, printk(":%d.%d", cmd->SCp.Status, lun))
1130                             hostdata->connected = NULL;
1131                         hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1132                         hostdata->state = S_UNCONNECTED;
1133                         if (cmd->SCp.Status == ILLEGAL_STATUS_BYTE)
1134                                 cmd->SCp.Status = lun;
1135                         if (cmd->cmnd[0] == REQUEST_SENSE
1136                             && cmd->SCp.Status != GOOD)
1137                                 cmd->result =
1138                                     (cmd->
1139                                      result & 0x00ffff) | (DID_ERROR << 16);
1140                         else
1141                                 cmd->result =
1142                                     cmd->SCp.Status | (cmd->SCp.Message << 8);
1143                         cmd->scsi_done(cmd);
1144
1145 /* We are no longer  connected to a target - check to see if
1146  * there are commands waiting to be executed.
1147  */
1148                         spin_unlock_irqrestore(&hostdata->lock, flags);
1149                         wd33c93_execute(instance);
1150                 } else {
1151                         printk
1152                             ("%02x:%02x:%02x-%ld: Unknown SEL_XFER_DONE phase!!---",
1153                              asr, sr, phs, cmd->pid);
1154                         spin_unlock_irqrestore(&hostdata->lock, flags);
1155                 }
1156                 break;
1157
1158 /* Note: this interrupt will occur only after a LEVEL2 command */
1159
1160         case CSR_SDP:
1161                 DB(DB_INTR, printk("SDP"))
1162                     hostdata->state = S_RUNNING_LEVEL2;
1163                 write_wd33c93(regs, WD_COMMAND_PHASE, 0x41);
1164                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1165                 spin_unlock_irqrestore(&hostdata->lock, flags);
1166                 break;
1167
1168         case CSR_XFER_DONE | PHS_MESS_OUT:
1169         case CSR_UNEXP | PHS_MESS_OUT:
1170         case CSR_SRV_REQ | PHS_MESS_OUT:
1171                 DB(DB_INTR, printk("MSG_OUT="))
1172
1173 /* To get here, we've probably requested MESSAGE_OUT and have
1174  * already put the correct bytes in outgoing_msg[] and filled
1175  * in outgoing_len. We simply send them out to the SCSI bus.
1176  * Sometimes we get MESSAGE_OUT phase when we're not expecting
1177  * it - like when our SDTR message is rejected by a target. Some
1178  * targets send the REJECT before receiving all of the extended
1179  * message, and then seem to go back to MESSAGE_OUT for a byte
1180  * or two. Not sure why, or if I'm doing something wrong to
1181  * cause this to happen. Regardless, it seems that sending
1182  * NOP messages in these situations results in no harm and
1183  * makes everyone happy.
1184  */
1185                     if (hostdata->outgoing_len == 0) {
1186                         hostdata->outgoing_len = 1;
1187                         hostdata->outgoing_msg[0] = NOP;
1188                 }
1189                 transfer_pio(regs, hostdata->outgoing_msg,
1190                              hostdata->outgoing_len, DATA_OUT_DIR, hostdata);
1191                 DB(DB_INTR, printk("%02x", hostdata->outgoing_msg[0]))
1192                     hostdata->outgoing_len = 0;
1193                 hostdata->state = S_CONNECTED;
1194                 spin_unlock_irqrestore(&hostdata->lock, flags);
1195                 break;
1196
1197         case CSR_UNEXP_DISC:
1198
1199 /* I think I've seen this after a request-sense that was in response
1200  * to an error condition, but not sure. We certainly need to do
1201  * something when we get this interrupt - the question is 'what?'.
1202  * Let's think positively, and assume some command has finished
1203  * in a legal manner (like a command that provokes a request-sense),
1204  * so we treat it as a normal command-complete-disconnect.
1205  */
1206
1207 /* Make sure that reselection is enabled at this point - it may
1208  * have been turned off for the command that just completed.
1209  */
1210
1211                 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1212                 if (cmd == NULL) {
1213                         printk(" - Already disconnected! ");
1214                         hostdata->state = S_UNCONNECTED;
1215                         spin_unlock_irqrestore(&hostdata->lock, flags);
1216                         return;
1217                 }
1218                 DB(DB_INTR, printk("UNEXP_DISC-%ld", cmd->pid))
1219                     hostdata->connected = NULL;
1220                 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1221                 hostdata->state = S_UNCONNECTED;
1222                 if (cmd->cmnd[0] == REQUEST_SENSE && cmd->SCp.Status != GOOD)
1223                         cmd->result =
1224                             (cmd->result & 0x00ffff) | (DID_ERROR << 16);
1225                 else
1226                         cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
1227                 cmd->scsi_done(cmd);
1228
1229 /* We are no longer connected to a target - check to see if
1230  * there are commands waiting to be executed.
1231  */
1232                 /* look above for comments on scsi_done() */
1233                 spin_unlock_irqrestore(&hostdata->lock, flags);
1234                 wd33c93_execute(instance);
1235                 break;
1236
1237         case CSR_DISC:
1238
1239 /* Make sure that reselection is enabled at this point - it may
1240  * have been turned off for the command that just completed.
1241  */
1242
1243                 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1244                 DB(DB_INTR, printk("DISC-%ld", cmd->pid))
1245                     if (cmd == NULL) {
1246                         printk(" - Already disconnected! ");
1247                         hostdata->state = S_UNCONNECTED;
1248                 }
1249                 switch (hostdata->state) {
1250                 case S_PRE_CMP_DISC:
1251                         hostdata->connected = NULL;
1252                         hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1253                         hostdata->state = S_UNCONNECTED;
1254                         DB(DB_INTR, printk(":%d", cmd->SCp.Status))
1255                             if (cmd->cmnd[0] == REQUEST_SENSE
1256                                 && cmd->SCp.Status != GOOD)
1257                                 cmd->result =
1258                                     (cmd->
1259                                      result & 0x00ffff) | (DID_ERROR << 16);
1260                         else
1261                                 cmd->result =
1262                                     cmd->SCp.Status | (cmd->SCp.Message << 8);
1263                         cmd->scsi_done(cmd);
1264                         break;
1265                 case S_PRE_TMP_DISC:
1266                 case S_RUNNING_LEVEL2:
1267                         cmd->host_scribble = (uchar *) hostdata->disconnected_Q;
1268                         hostdata->disconnected_Q = cmd;
1269                         hostdata->connected = NULL;
1270                         hostdata->state = S_UNCONNECTED;
1271
1272 #ifdef PROC_STATISTICS
1273                         hostdata->disc_done_cnt[cmd->device->id]++;
1274 #endif
1275
1276                         break;
1277                 default:
1278                         printk("*** Unexpected DISCONNECT interrupt! ***");
1279                         hostdata->state = S_UNCONNECTED;
1280                 }
1281
1282 /* We are no longer connected to a target - check to see if
1283  * there are commands waiting to be executed.
1284  */
1285                 spin_unlock_irqrestore(&hostdata->lock, flags);
1286                 wd33c93_execute(instance);
1287                 break;
1288
1289         case CSR_RESEL_AM:
1290         case CSR_RESEL:
1291                 DB(DB_INTR, printk("RESEL%s", sr == CSR_RESEL_AM ? "_AM" : ""))
1292
1293                     /* Old chips (pre -A ???) don't have advanced features and will
1294                      * generate CSR_RESEL.  In that case we have to extract the LUN the
1295                      * hard way (see below).
1296                      * First we have to make sure this reselection didn't
1297                      * happen during Arbitration/Selection of some other device.
1298                      * If yes, put losing command back on top of input_Q.
1299                      */
1300                     if (hostdata->level2 <= L2_NONE) {
1301
1302                         if (hostdata->selecting) {
1303                                 cmd = (struct scsi_cmnd *) hostdata->selecting;
1304                                 hostdata->selecting = NULL;
1305                                 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1306                                 cmd->host_scribble =
1307                                     (uchar *) hostdata->input_Q;
1308                                 hostdata->input_Q = cmd;
1309                         }
1310                 }
1311
1312                 else {
1313
1314                         if (cmd) {
1315                                 if (phs == 0x00) {
1316                                         hostdata->busy[cmd->device->id] &=
1317                                             ~(1 << cmd->device->lun);
1318                                         cmd->host_scribble =
1319                                             (uchar *) hostdata->input_Q;
1320                                         hostdata->input_Q = cmd;
1321                                 } else {
1322                                         printk
1323                                             ("---%02x:%02x:%02x-TROUBLE: Intrusive ReSelect!---",
1324                                              asr, sr, phs);
1325                                         while (1)
1326                                                 printk("\r");
1327                                 }
1328                         }
1329
1330                 }
1331
1332                 /* OK - find out which device reselected us. */
1333
1334                 id = read_wd33c93(regs, WD_SOURCE_ID);
1335                 id &= SRCID_MASK;
1336
1337                 /* and extract the lun from the ID message. (Note that we don't
1338                  * bother to check for a valid message here - I guess this is
1339                  * not the right way to go, but...)
1340                  */
1341
1342                 if (sr == CSR_RESEL_AM) {
1343                         lun = read_wd33c93(regs, WD_DATA);
1344                         if (hostdata->level2 < L2_RESELECT)
1345                                 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1346                         lun &= 7;
1347                 } else {
1348                         /* Old chip; wait for msgin phase to pick up the LUN. */
1349                         for (lun = 255; lun; lun--) {
1350                                 if ((asr = read_aux_stat(regs)) & ASR_INT)
1351                                         break;
1352                                 udelay(10);
1353                         }
1354                         if (!(asr & ASR_INT)) {
1355                                 printk
1356                                     ("wd33c93: Reselected without IDENTIFY\n");
1357                                 lun = 0;
1358                         } else {
1359                                 /* Verify this is a change to MSG_IN and read the message */
1360                                 sr = read_wd33c93(regs, WD_SCSI_STATUS);
1361                                 if (sr == (CSR_ABORT | PHS_MESS_IN) ||
1362                                     sr == (CSR_UNEXP | PHS_MESS_IN) ||
1363                                     sr == (CSR_SRV_REQ | PHS_MESS_IN)) {
1364                                         /* Got MSG_IN, grab target LUN */
1365                                         lun = read_1_byte(regs);
1366                                         /* Now we expect a 'paused with ACK asserted' int.. */
1367                                         asr = read_aux_stat(regs);
1368                                         if (!(asr & ASR_INT)) {
1369                                                 udelay(10);
1370                                                 asr = read_aux_stat(regs);
1371                                                 if (!(asr & ASR_INT))
1372                                                         printk
1373                                                             ("wd33c93: No int after LUN on RESEL (%02x)\n",
1374                                                              asr);
1375                                         }
1376                                         sr = read_wd33c93(regs, WD_SCSI_STATUS);
1377                                         if (sr != CSR_MSGIN)
1378                                                 printk
1379                                                     ("wd33c93: Not paused with ACK on RESEL (%02x)\n",
1380                                                      sr);
1381                                         lun &= 7;
1382                                         write_wd33c93_cmd(regs,
1383                                                           WD_CMD_NEGATE_ACK);
1384                                 } else {
1385                                         printk
1386                                             ("wd33c93: Not MSG_IN on reselect (%02x)\n",
1387                                              sr);
1388                                         lun = 0;
1389                                 }
1390                         }
1391                 }
1392
1393                 /* Now we look for the command that's reconnecting. */
1394
1395                 cmd = (struct scsi_cmnd *) hostdata->disconnected_Q;
1396                 patch = NULL;
1397                 while (cmd) {
1398                         if (id == cmd->device->id && lun == cmd->device->lun)
1399                                 break;
1400                         patch = cmd;
1401                         cmd = (struct scsi_cmnd *) cmd->host_scribble;
1402                 }
1403
1404                 /* Hmm. Couldn't find a valid command.... What to do? */
1405
1406                 if (!cmd) {
1407                         printk
1408                             ("---TROUBLE: target %d.%d not in disconnect queue---",
1409                              id, lun);
1410                         spin_unlock_irqrestore(&hostdata->lock, flags);
1411                         return;
1412                 }
1413
1414                 /* Ok, found the command - now start it up again. */
1415
1416                 if (patch)
1417                         patch->host_scribble = cmd->host_scribble;
1418                 else
1419                         hostdata->disconnected_Q =
1420                             (struct scsi_cmnd *) cmd->host_scribble;
1421                 hostdata->connected = cmd;
1422
1423                 /* We don't need to worry about 'initialize_SCp()' or 'hostdata->busy[]'
1424                  * because these things are preserved over a disconnect.
1425                  * But we DO need to fix the DPD bit so it's correct for this command.
1426                  */
1427
1428                 if (cmd->sc_data_direction == DMA_TO_DEVICE)
1429                         write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);
1430                 else
1431                         write_wd33c93(regs, WD_DESTINATION_ID,
1432                                       cmd->device->id | DSTID_DPD);
1433                 if (hostdata->level2 >= L2_RESELECT) {
1434                         write_wd33c93_count(regs, 0);   /* we want a DATA_PHASE interrupt */
1435                         write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
1436                         write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1437                         hostdata->state = S_RUNNING_LEVEL2;
1438                 } else
1439                         hostdata->state = S_CONNECTED;
1440
1441                 DB(DB_INTR, printk("-%ld", cmd->pid))
1442                     spin_unlock_irqrestore(&hostdata->lock, flags);
1443                 break;
1444
1445         default:
1446                 printk("--UNKNOWN INTERRUPT:%02x:%02x:%02x--", asr, sr, phs);
1447                 spin_unlock_irqrestore(&hostdata->lock, flags);
1448         }
1449
1450         DB(DB_INTR, printk("} "))
1451
1452 }
1453
1454 static void
1455 reset_wd33c93(struct Scsi_Host *instance)
1456 {
1457         struct WD33C93_hostdata *hostdata =
1458             (struct WD33C93_hostdata *) instance->hostdata;
1459         const wd33c93_regs regs = hostdata->regs;
1460         uchar sr;
1461
1462 #ifdef CONFIG_SGI_IP22
1463         {
1464                 int busycount = 0;
1465                 extern void sgiwd93_reset(unsigned long);
1466                 /* wait 'til the chip gets some time for us */
1467                 while ((read_aux_stat(regs) & ASR_BSY) && busycount++ < 100)
1468                         udelay (10);
1469         /*
1470          * there are scsi devices out there, which manage to lock up
1471          * the wd33c93 in a busy condition. In this state it won't
1472          * accept the reset command. The only way to solve this is to
1473          * give the chip a hardware reset (if possible). The code below
1474          * does this for the SGI Indy, where this is possible
1475          */
1476         /* still busy ? */
1477         if (read_aux_stat(regs) & ASR_BSY)
1478                 sgiwd93_reset(instance->base); /* yeah, give it the hard one */
1479         }
1480 #endif
1481
1482         write_wd33c93(regs, WD_OWN_ID, OWNID_EAF | OWNID_RAF |
1483                       instance->this_id | hostdata->clock_freq);
1484         write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1485         write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
1486                       calc_sync_xfer(hostdata->default_sx_per / 4,
1487                                      DEFAULT_SX_OFF));
1488         write_wd33c93(regs, WD_COMMAND, WD_CMD_RESET);
1489
1490
1491 #ifdef CONFIG_MVME147_SCSI
1492         udelay(25);             /* The old wd33c93 on MVME147 needs this, at least */
1493 #endif
1494
1495         while (!(read_aux_stat(regs) & ASR_INT))
1496                 ;
1497         sr = read_wd33c93(regs, WD_SCSI_STATUS);
1498
1499         hostdata->microcode = read_wd33c93(regs, WD_CDB_1);
1500         if (sr == 0x00)
1501                 hostdata->chip = C_WD33C93;
1502         else if (sr == 0x01) {
1503                 write_wd33c93(regs, WD_QUEUE_TAG, 0xa5);        /* any random number */
1504                 sr = read_wd33c93(regs, WD_QUEUE_TAG);
1505                 if (sr == 0xa5) {
1506                         hostdata->chip = C_WD33C93B;
1507                         write_wd33c93(regs, WD_QUEUE_TAG, 0);
1508                 } else
1509                         hostdata->chip = C_WD33C93A;
1510         } else
1511                 hostdata->chip = C_UNKNOWN_CHIP;
1512
1513         write_wd33c93(regs, WD_TIMEOUT_PERIOD, TIMEOUT_PERIOD_VALUE);
1514         write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1515 }
1516
1517 int
1518 wd33c93_host_reset(struct scsi_cmnd * SCpnt)
1519 {
1520         struct Scsi_Host *instance;
1521         struct WD33C93_hostdata *hostdata;
1522         int i;
1523
1524         instance = SCpnt->device->host;
1525         hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1526
1527         printk("scsi%d: reset. ", instance->host_no);
1528         disable_irq(instance->irq);
1529
1530         hostdata->dma_stop(instance, NULL, 0);
1531         for (i = 0; i < 8; i++) {
1532                 hostdata->busy[i] = 0;
1533                 hostdata->sync_xfer[i] =
1534                     calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF);
1535                 hostdata->sync_stat[i] = SS_UNSET;      /* using default sync values */
1536         }
1537         hostdata->input_Q = NULL;
1538         hostdata->selecting = NULL;
1539         hostdata->connected = NULL;
1540         hostdata->disconnected_Q = NULL;
1541         hostdata->state = S_UNCONNECTED;
1542         hostdata->dma = D_DMA_OFF;
1543         hostdata->incoming_ptr = 0;
1544         hostdata->outgoing_len = 0;
1545
1546         reset_wd33c93(instance);
1547         SCpnt->result = DID_RESET << 16;
1548         enable_irq(instance->irq);
1549         return SUCCESS;
1550 }
1551
1552 int
1553 wd33c93_abort(struct scsi_cmnd * cmd)
1554 {
1555         struct Scsi_Host *instance;
1556         struct WD33C93_hostdata *hostdata;
1557         wd33c93_regs regs;
1558         struct scsi_cmnd *tmp, *prev;
1559
1560         disable_irq(cmd->device->host->irq);
1561
1562         instance = cmd->device->host;
1563         hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1564         regs = hostdata->regs;
1565
1566 /*
1567  * Case 1 : If the command hasn't been issued yet, we simply remove it
1568  *     from the input_Q.
1569  */
1570
1571         tmp = (struct scsi_cmnd *) hostdata->input_Q;
1572         prev = NULL;
1573         while (tmp) {
1574                 if (tmp == cmd) {
1575                         if (prev)
1576                                 prev->host_scribble = cmd->host_scribble;
1577                         else
1578                                 hostdata->input_Q =
1579                                     (struct scsi_cmnd *) cmd->host_scribble;
1580                         cmd->host_scribble = NULL;
1581                         cmd->result = DID_ABORT << 16;
1582                         printk
1583                             ("scsi%d: Abort - removing command %ld from input_Q. ",
1584                              instance->host_no, cmd->pid);
1585                         enable_irq(cmd->device->host->irq);
1586                         cmd->scsi_done(cmd);
1587                         return SUCCESS;
1588                 }
1589                 prev = tmp;
1590                 tmp = (struct scsi_cmnd *) tmp->host_scribble;
1591         }
1592
1593 /*
1594  * Case 2 : If the command is connected, we're going to fail the abort
1595  *     and let the high level SCSI driver retry at a later time or
1596  *     issue a reset.
1597  *
1598  *     Timeouts, and therefore aborted commands, will be highly unlikely
1599  *     and handling them cleanly in this situation would make the common
1600  *     case of noresets less efficient, and would pollute our code.  So,
1601  *     we fail.
1602  */
1603
1604         if (hostdata->connected == cmd) {
1605                 uchar sr, asr;
1606                 unsigned long timeout;
1607
1608                 printk("scsi%d: Aborting connected command %ld - ",
1609                        instance->host_no, cmd->pid);
1610
1611                 printk("stopping DMA - ");
1612                 if (hostdata->dma == D_DMA_RUNNING) {
1613                         hostdata->dma_stop(instance, cmd, 0);
1614                         hostdata->dma = D_DMA_OFF;
1615                 }
1616
1617                 printk("sending wd33c93 ABORT command - ");
1618                 write_wd33c93(regs, WD_CONTROL,
1619                               CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1620                 write_wd33c93_cmd(regs, WD_CMD_ABORT);
1621
1622 /* Now we have to attempt to flush out the FIFO... */
1623
1624                 printk("flushing fifo - ");
1625                 timeout = 1000000;
1626                 do {
1627                         asr = read_aux_stat(regs);
1628                         if (asr & ASR_DBR)
1629                                 read_wd33c93(regs, WD_DATA);
1630                 } while (!(asr & ASR_INT) && timeout-- > 0);
1631                 sr = read_wd33c93(regs, WD_SCSI_STATUS);
1632                 printk
1633                     ("asr=%02x, sr=%02x, %ld bytes un-transferred (timeout=%ld) - ",
1634                      asr, sr, read_wd33c93_count(regs), timeout);
1635
1636                 /*
1637                  * Abort command processed.
1638                  * Still connected.
1639                  * We must disconnect.
1640                  */
1641
1642                 printk("sending wd33c93 DISCONNECT command - ");
1643                 write_wd33c93_cmd(regs, WD_CMD_DISCONNECT);
1644
1645                 timeout = 1000000;
1646                 asr = read_aux_stat(regs);
1647                 while ((asr & ASR_CIP) && timeout-- > 0)
1648                         asr = read_aux_stat(regs);
1649                 sr = read_wd33c93(regs, WD_SCSI_STATUS);
1650                 printk("asr=%02x, sr=%02x.", asr, sr);
1651
1652                 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1653                 hostdata->connected = NULL;
1654                 hostdata->state = S_UNCONNECTED;
1655                 cmd->result = DID_ABORT << 16;
1656
1657 /*      sti();*/
1658                 wd33c93_execute(instance);
1659
1660                 enable_irq(cmd->device->host->irq);
1661                 cmd->scsi_done(cmd);
1662                 return SUCCESS;
1663         }
1664
1665 /*
1666  * Case 3: If the command is currently disconnected from the bus,
1667  * we're not going to expend much effort here: Let's just return
1668  * an ABORT_SNOOZE and hope for the best...
1669  */
1670
1671         tmp = (struct scsi_cmnd *) hostdata->disconnected_Q;
1672         while (tmp) {
1673                 if (tmp == cmd) {
1674                         printk
1675                             ("scsi%d: Abort - command %ld found on disconnected_Q - ",
1676                              instance->host_no, cmd->pid);
1677                         printk("Abort SNOOZE. ");
1678                         enable_irq(cmd->device->host->irq);
1679                         return FAILED;
1680                 }
1681                 tmp = (struct scsi_cmnd *) tmp->host_scribble;
1682         }
1683
1684 /*
1685  * Case 4 : If we reached this point, the command was not found in any of
1686  *     the queues.
1687  *
1688  * We probably reached this point because of an unlikely race condition
1689  * between the command completing successfully and the abortion code,
1690  * so we won't panic, but we will notify the user in case something really
1691  * broke.
1692  */
1693
1694 /*   sti();*/
1695         wd33c93_execute(instance);
1696
1697         enable_irq(cmd->device->host->irq);
1698         printk("scsi%d: warning : SCSI command probably completed successfully"
1699                "         before abortion. ", instance->host_no);
1700         return FAILED;
1701 }
1702
1703 #define MAX_WD33C93_HOSTS 4
1704 #define MAX_SETUP_ARGS ((int)(sizeof(setup_args) / sizeof(char *)))
1705 #define SETUP_BUFFER_SIZE 200
1706 static char setup_buffer[SETUP_BUFFER_SIZE];
1707 static char setup_used[MAX_SETUP_ARGS];
1708 static int done_setup = 0;
1709
1710 int
1711 wd33c93_setup(char *str)
1712 {
1713         int i;
1714         char *p1, *p2;
1715
1716         /* The kernel does some processing of the command-line before calling
1717          * this function: If it begins with any decimal or hex number arguments,
1718          * ints[0] = how many numbers found and ints[1] through [n] are the values
1719          * themselves. str points to where the non-numeric arguments (if any)
1720          * start: We do our own parsing of those. We construct synthetic 'nosync'
1721          * keywords out of numeric args (to maintain compatibility with older
1722          * versions) and then add the rest of the arguments.
1723          */
1724
1725         p1 = setup_buffer;
1726         *p1 = '\0';
1727         if (str)
1728                 strncpy(p1, str, SETUP_BUFFER_SIZE - strlen(setup_buffer));
1729         setup_buffer[SETUP_BUFFER_SIZE - 1] = '\0';
1730         p1 = setup_buffer;
1731         i = 0;
1732         while (*p1 && (i < MAX_SETUP_ARGS)) {
1733                 p2 = strchr(p1, ',');
1734                 if (p2) {
1735                         *p2 = '\0';
1736                         if (p1 != p2)
1737                                 setup_args[i] = p1;
1738                         p1 = p2 + 1;
1739                         i++;
1740                 } else {
1741                         setup_args[i] = p1;
1742                         break;
1743                 }
1744         }
1745         for (i = 0; i < MAX_SETUP_ARGS; i++)
1746                 setup_used[i] = 0;
1747         done_setup = 1;
1748
1749         return 1;
1750 }
1751 __setup("wd33c93=", wd33c93_setup);
1752
1753 /* check_setup_args() returns index if key found, 0 if not
1754  */
1755 static int
1756 check_setup_args(char *key, int *flags, int *val, char *buf)
1757 {
1758         int x;
1759         char *cp;
1760
1761         for (x = 0; x < MAX_SETUP_ARGS; x++) {
1762                 if (setup_used[x])
1763                         continue;
1764                 if (!strncmp(setup_args[x], key, strlen(key)))
1765                         break;
1766                 if (!strncmp(setup_args[x], "next", strlen("next")))
1767                         return 0;
1768         }
1769         if (x == MAX_SETUP_ARGS)
1770                 return 0;
1771         setup_used[x] = 1;
1772         cp = setup_args[x] + strlen(key);
1773         *val = -1;
1774         if (*cp != ':')
1775                 return ++x;
1776         cp++;
1777         if ((*cp >= '0') && (*cp <= '9')) {
1778                 *val = simple_strtoul(cp, NULL, 0);
1779         }
1780         return ++x;
1781 }
1782
1783 void
1784 wd33c93_init(struct Scsi_Host *instance, const wd33c93_regs regs,
1785              dma_setup_t setup, dma_stop_t stop, int clock_freq)
1786 {
1787         struct WD33C93_hostdata *hostdata;
1788         int i;
1789         int flags;
1790         int val;
1791         char buf[32];
1792
1793         if (!done_setup && setup_strings)
1794                 wd33c93_setup(setup_strings);
1795
1796         hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1797
1798         hostdata->regs = regs;
1799         hostdata->clock_freq = clock_freq;
1800         hostdata->dma_setup = setup;
1801         hostdata->dma_stop = stop;
1802         hostdata->dma_bounce_buffer = NULL;
1803         hostdata->dma_bounce_len = 0;
1804         for (i = 0; i < 8; i++) {
1805                 hostdata->busy[i] = 0;
1806                 hostdata->sync_xfer[i] =
1807                     calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF);
1808                 hostdata->sync_stat[i] = SS_UNSET;      /* using default sync values */
1809 #ifdef PROC_STATISTICS
1810                 hostdata->cmd_cnt[i] = 0;
1811                 hostdata->disc_allowed_cnt[i] = 0;
1812                 hostdata->disc_done_cnt[i] = 0;
1813 #endif
1814         }
1815         hostdata->input_Q = NULL;
1816         hostdata->selecting = NULL;
1817         hostdata->connected = NULL;
1818         hostdata->disconnected_Q = NULL;
1819         hostdata->state = S_UNCONNECTED;
1820         hostdata->dma = D_DMA_OFF;
1821         hostdata->level2 = L2_BASIC;
1822         hostdata->disconnect = DIS_ADAPTIVE;
1823         hostdata->args = DEBUG_DEFAULTS;
1824         hostdata->incoming_ptr = 0;
1825         hostdata->outgoing_len = 0;
1826         hostdata->default_sx_per = DEFAULT_SX_PER;
1827         hostdata->no_sync = 0xff;       /* sync defaults to off */
1828         hostdata->no_dma = 0;   /* default is DMA enabled */
1829
1830 #ifdef PROC_INTERFACE
1831         hostdata->proc = PR_VERSION | PR_INFO | PR_STATISTICS |
1832             PR_CONNECTED | PR_INPUTQ | PR_DISCQ | PR_STOP;
1833 #ifdef PROC_STATISTICS
1834         hostdata->dma_cnt = 0;
1835         hostdata->pio_cnt = 0;
1836         hostdata->int_cnt = 0;
1837 #endif
1838 #endif
1839
1840         if (check_setup_args("nosync", &flags, &val, buf))
1841                 hostdata->no_sync = val;
1842
1843         if (check_setup_args("nodma", &flags, &val, buf))
1844                 hostdata->no_dma = (val == -1) ? 1 : val;
1845
1846         if (check_setup_args("period", &flags, &val, buf))
1847                 hostdata->default_sx_per =
1848                     sx_table[round_period((unsigned int) val)].period_ns;
1849
1850         if (check_setup_args("disconnect", &flags, &val, buf)) {
1851                 if ((val >= DIS_NEVER) && (val <= DIS_ALWAYS))
1852                         hostdata->disconnect = val;
1853                 else
1854                         hostdata->disconnect = DIS_ADAPTIVE;
1855         }
1856
1857         if (check_setup_args("level2", &flags, &val, buf))
1858                 hostdata->level2 = val;
1859
1860         if (check_setup_args("debug", &flags, &val, buf))
1861                 hostdata->args = val & DB_MASK;
1862
1863         if (check_setup_args("clock", &flags, &val, buf)) {
1864                 if (val > 7 && val < 11)
1865                         val = WD33C93_FS_8_10;
1866                 else if (val > 11 && val < 16)
1867                         val = WD33C93_FS_12_15;
1868                 else if (val > 15 && val < 21)
1869                         val = WD33C93_FS_16_20;
1870                 else
1871                         val = WD33C93_FS_8_10;
1872                 hostdata->clock_freq = val;
1873         }
1874
1875         if ((i = check_setup_args("next", &flags, &val, buf))) {
1876                 while (i)
1877                         setup_used[--i] = 1;
1878         }
1879 #ifdef PROC_INTERFACE
1880         if (check_setup_args("proc", &flags, &val, buf))
1881                 hostdata->proc = val;
1882 #endif
1883
1884         spin_lock_irq(&hostdata->lock);
1885         reset_wd33c93(instance);
1886         spin_unlock_irq(&hostdata->lock);
1887
1888         printk("wd33c93-%d: chip=%s/%d no_sync=0x%x no_dma=%d",
1889                instance->host_no,
1890                (hostdata->chip == C_WD33C93) ? "WD33c93" : (hostdata->chip ==
1891                                                             C_WD33C93A) ?
1892                "WD33c93A" : (hostdata->chip ==
1893                              C_WD33C93B) ? "WD33c93B" : "unknown",
1894                hostdata->microcode, hostdata->no_sync, hostdata->no_dma);
1895 #ifdef DEBUGGING_ON
1896         printk(" debug_flags=0x%02x\n", hostdata->args);
1897 #else
1898         printk(" debugging=OFF\n");
1899 #endif
1900         printk("           setup_args=");
1901         for (i = 0; i < MAX_SETUP_ARGS; i++)
1902                 printk("%s,", setup_args[i]);
1903         printk("\n");
1904         printk("           Version %s - %s, Compiled %s at %s\n",
1905                WD33C93_VERSION, WD33C93_DATE, __DATE__, __TIME__);
1906 }
1907
1908 int
1909 wd33c93_proc_info(struct Scsi_Host *instance, char *buf, char **start, off_t off, int len, int in)
1910 {
1911
1912 #ifdef PROC_INTERFACE
1913
1914         char *bp;
1915         char tbuf[128];
1916         struct WD33C93_hostdata *hd;
1917         struct scsi_cmnd *cmd;
1918         int x, i;
1919         static int stop = 0;
1920
1921         hd = (struct WD33C93_hostdata *) instance->hostdata;
1922
1923 /* If 'in' is TRUE we need to _read_ the proc file. We accept the following
1924  * keywords (same format as command-line, but only ONE per read):
1925  *    debug
1926  *    disconnect
1927  *    period
1928  *    resync
1929  *    proc
1930  *    nodma
1931  */
1932
1933         if (in) {
1934                 buf[len] = '\0';
1935                 bp = buf;
1936                 if (!strncmp(bp, "debug:", 6)) {
1937                         bp += 6;
1938                         hd->args = simple_strtoul(bp, NULL, 0) & DB_MASK;
1939                 } else if (!strncmp(bp, "disconnect:", 11)) {
1940                         bp += 11;
1941                         x = simple_strtoul(bp, NULL, 0);
1942                         if (x < DIS_NEVER || x > DIS_ALWAYS)
1943                                 x = DIS_ADAPTIVE;
1944                         hd->disconnect = x;
1945                 } else if (!strncmp(bp, "period:", 7)) {
1946                         bp += 7;
1947                         x = simple_strtoul(bp, NULL, 0);
1948                         hd->default_sx_per =
1949                             sx_table[round_period((unsigned int) x)].period_ns;
1950                 } else if (!strncmp(bp, "resync:", 7)) {
1951                         bp += 7;
1952                         x = simple_strtoul(bp, NULL, 0);
1953                         for (i = 0; i < 7; i++)
1954                                 if (x & (1 << i))
1955                                         hd->sync_stat[i] = SS_UNSET;
1956                 } else if (!strncmp(bp, "proc:", 5)) {
1957                         bp += 5;
1958                         hd->proc = simple_strtoul(bp, NULL, 0);
1959                 } else if (!strncmp(bp, "nodma:", 6)) {
1960                         bp += 6;
1961                         hd->no_dma = simple_strtoul(bp, NULL, 0);
1962                 } else if (!strncmp(bp, "level2:", 7)) {
1963                         bp += 7;
1964                         hd->level2 = simple_strtoul(bp, NULL, 0);
1965                 }
1966                 return len;
1967         }
1968
1969         spin_lock_irq(&hd->lock);
1970         bp = buf;
1971         *bp = '\0';
1972         if (hd->proc & PR_VERSION) {
1973                 sprintf(tbuf, "\nVersion %s - %s. Compiled %s %s",
1974                         WD33C93_VERSION, WD33C93_DATE, __DATE__, __TIME__);
1975                 strcat(bp, tbuf);
1976         }
1977         if (hd->proc & PR_INFO) {
1978                 sprintf(tbuf, "\nclock_freq=%02x no_sync=%02x no_dma=%d",
1979                         hd->clock_freq, hd->no_sync, hd->no_dma);
1980                 strcat(bp, tbuf);
1981                 strcat(bp, "\nsync_xfer[] =       ");
1982                 for (x = 0; x < 7; x++) {
1983                         sprintf(tbuf, "\t%02x", hd->sync_xfer[x]);
1984                         strcat(bp, tbuf);
1985                 }
1986                 strcat(bp, "\nsync_stat[] =       ");
1987                 for (x = 0; x < 7; x++) {
1988                         sprintf(tbuf, "\t%02x", hd->sync_stat[x]);
1989                         strcat(bp, tbuf);
1990                 }
1991         }
1992 #ifdef PROC_STATISTICS
1993         if (hd->proc & PR_STATISTICS) {
1994                 strcat(bp, "\ncommands issued:    ");
1995                 for (x = 0; x < 7; x++) {
1996                         sprintf(tbuf, "\t%ld", hd->cmd_cnt[x]);
1997                         strcat(bp, tbuf);
1998                 }
1999                 strcat(bp, "\ndisconnects allowed:");
2000                 for (x = 0; x < 7; x++) {
2001                         sprintf(tbuf, "\t%ld", hd->disc_allowed_cnt[x]);
2002                         strcat(bp, tbuf);
2003                 }
2004                 strcat(bp, "\ndisconnects done:   ");
2005                 for (x = 0; x < 7; x++) {
2006                         sprintf(tbuf, "\t%ld", hd->disc_done_cnt[x]);
2007                         strcat(bp, tbuf);
2008                 }
2009                 sprintf(tbuf,
2010                         "\ninterrupts: %ld, DATA_PHASE ints: %ld DMA, %ld PIO",
2011                         hd->int_cnt, hd->dma_cnt, hd->pio_cnt);
2012                 strcat(bp, tbuf);
2013         }
2014 #endif
2015         if (hd->proc & PR_CONNECTED) {
2016                 strcat(bp, "\nconnected:     ");
2017                 if (hd->connected) {
2018                         cmd = (struct scsi_cmnd *) hd->connected;
2019                         sprintf(tbuf, " %ld-%d:%d(%02x)",
2020                                 cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2021                         strcat(bp, tbuf);
2022                 }
2023         }
2024         if (hd->proc & PR_INPUTQ) {
2025                 strcat(bp, "\ninput_Q:       ");
2026                 cmd = (struct scsi_cmnd *) hd->input_Q;
2027                 while (cmd) {
2028                         sprintf(tbuf, " %ld-%d:%d(%02x)",
2029                                 cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2030                         strcat(bp, tbuf);
2031                         cmd = (struct scsi_cmnd *) cmd->host_scribble;
2032                 }
2033         }
2034         if (hd->proc & PR_DISCQ) {
2035                 strcat(bp, "\ndisconnected_Q:");
2036                 cmd = (struct scsi_cmnd *) hd->disconnected_Q;
2037                 while (cmd) {
2038                         sprintf(tbuf, " %ld-%d:%d(%02x)",
2039                                 cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2040                         strcat(bp, tbuf);
2041                         cmd = (struct scsi_cmnd *) cmd->host_scribble;
2042                 }
2043         }
2044         strcat(bp, "\n");
2045         spin_unlock_irq(&hd->lock);
2046         *start = buf;
2047         if (stop) {
2048                 stop = 0;
2049                 return 0;
2050         }
2051         if (off > 0x40000)      /* ALWAYS stop after 256k bytes have been read */
2052                 stop = 1;
2053         if (hd->proc & PR_STOP) /* stop every other time */
2054                 stop = 1;
2055         return strlen(bp);
2056
2057 #else                           /* PROC_INTERFACE */
2058
2059         return 0;
2060
2061 #endif                          /* PROC_INTERFACE */
2062
2063 }
2064
2065 void
2066 wd33c93_release(void)
2067 {
2068 }
2069
2070 EXPORT_SYMBOL(wd33c93_host_reset);
2071 EXPORT_SYMBOL(wd33c93_init);
2072 EXPORT_SYMBOL(wd33c93_release);
2073 EXPORT_SYMBOL(wd33c93_abort);
2074 EXPORT_SYMBOL(wd33c93_queuecommand);
2075 EXPORT_SYMBOL(wd33c93_intr);
2076 EXPORT_SYMBOL(wd33c93_proc_info);