cxgb{3,4}*: improve Kconfig dependencies
[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  * 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 static int
375 wd33c93_queuecommand_lck(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 (scsi_bufflen(cmd)) {
411                 cmd->SCp.buffer = scsi_sglist(cmd);
412                 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 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 = NULL;
419                 cmd->SCp.this_residual = 0;
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 DEF_SCSI_QCMD(wd33c93_queuecommand)
472
473 /*
474  * This routine attempts to start a scsi command. If the host_card is
475  * already connected, we give up immediately. Otherwise, look through
476  * the input_Q, using the first command we find that's intended
477  * for a currently non-busy target/lun.
478  *
479  * wd33c93_execute() is always called with interrupts disabled or from
480  * the wd33c93_intr itself, which means that a wd33c93 interrupt
481  * cannot occur while we are in here.
482  */
483 static void
484 wd33c93_execute(struct Scsi_Host *instance)
485 {
486         struct WD33C93_hostdata *hostdata =
487             (struct WD33C93_hostdata *) instance->hostdata;
488         const wd33c93_regs regs = hostdata->regs;
489         struct scsi_cmnd *cmd, *prev;
490
491         DB(DB_EXECUTE, printk("EX("))
492         if (hostdata->selecting || hostdata->connected) {
493                 DB(DB_EXECUTE, printk(")EX-0 "))
494                 return;
495         }
496
497         /*
498          * Search through the input_Q for a command destined
499          * for an idle target/lun.
500          */
501
502         cmd = (struct scsi_cmnd *) hostdata->input_Q;
503         prev = NULL;
504         while (cmd) {
505                 if (!(hostdata->busy[cmd->device->id] & (1 << cmd->device->lun)))
506                         break;
507                 prev = cmd;
508                 cmd = (struct scsi_cmnd *) cmd->host_scribble;
509         }
510
511         /* quit if queue empty or all possible targets are busy */
512
513         if (!cmd) {
514                 DB(DB_EXECUTE, printk(")EX-1 "))
515                 return;
516         }
517
518         /*  remove command from queue */
519
520         if (prev)
521                 prev->host_scribble = cmd->host_scribble;
522         else
523                 hostdata->input_Q = (struct scsi_cmnd *) cmd->host_scribble;
524
525 #ifdef PROC_STATISTICS
526         hostdata->cmd_cnt[cmd->device->id]++;
527 #endif
528
529         /*
530          * Start the selection process
531          */
532
533         if (cmd->sc_data_direction == DMA_TO_DEVICE)
534                 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);
535         else
536                 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id | DSTID_DPD);
537
538 /* Now we need to figure out whether or not this command is a good
539  * candidate for disconnect/reselect. We guess to the best of our
540  * ability, based on a set of hierarchical rules. When several
541  * devices are operating simultaneously, disconnects are usually
542  * an advantage. In a single device system, or if only 1 device
543  * is being accessed, transfers usually go faster if disconnects
544  * are not allowed:
545  *
546  * + Commands should NEVER disconnect if hostdata->disconnect =
547  *   DIS_NEVER (this holds for tape drives also), and ALWAYS
548  *   disconnect if hostdata->disconnect = DIS_ALWAYS.
549  * + Tape drive commands should always be allowed to disconnect.
550  * + Disconnect should be allowed if disconnected_Q isn't empty.
551  * + Commands should NOT disconnect if input_Q is empty.
552  * + Disconnect should be allowed if there are commands in input_Q
553  *   for a different target/lun. In this case, the other commands
554  *   should be made disconnect-able, if not already.
555  *
556  * I know, I know - this code would flunk me out of any
557  * "C Programming 101" class ever offered. But it's easy
558  * to change around and experiment with for now.
559  */
560
561         cmd->SCp.phase = 0;     /* assume no disconnect */
562         if (hostdata->disconnect == DIS_NEVER)
563                 goto no;
564         if (hostdata->disconnect == DIS_ALWAYS)
565                 goto yes;
566         if (cmd->device->type == 1)     /* tape drive? */
567                 goto yes;
568         if (hostdata->disconnected_Q)   /* other commands disconnected? */
569                 goto yes;
570         if (!(hostdata->input_Q))       /* input_Q empty? */
571                 goto no;
572         for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;
573              prev = (struct scsi_cmnd *) prev->host_scribble) {
574                 if ((prev->device->id != cmd->device->id) ||
575                     (prev->device->lun != cmd->device->lun)) {
576                         for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;
577                              prev = (struct scsi_cmnd *) prev->host_scribble)
578                                 prev->SCp.phase = 1;
579                         goto yes;
580                 }
581         }
582
583         goto no;
584
585  yes:
586         cmd->SCp.phase = 1;
587
588 #ifdef PROC_STATISTICS
589         hostdata->disc_allowed_cnt[cmd->device->id]++;
590 #endif
591
592  no:
593
594         write_wd33c93(regs, WD_SOURCE_ID, ((cmd->SCp.phase) ? SRCID_ER : 0));
595
596         write_wd33c93(regs, WD_TARGET_LUN, cmd->device->lun);
597         write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
598                       hostdata->sync_xfer[cmd->device->id]);
599         hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
600
601         if ((hostdata->level2 == L2_NONE) ||
602             (hostdata->sync_stat[cmd->device->id] == SS_UNSET)) {
603
604                 /*
605                  * Do a 'Select-With-ATN' command. This will end with
606                  * one of the following interrupts:
607                  *    CSR_RESEL_AM:  failure - can try again later.
608                  *    CSR_TIMEOUT:   failure - give up.
609                  *    CSR_SELECT:    success - proceed.
610                  */
611
612                 hostdata->selecting = cmd;
613
614 /* Every target has its own synchronous transfer setting, kept in the
615  * sync_xfer array, and a corresponding status byte in sync_stat[].
616  * Each target's sync_stat[] entry is initialized to SX_UNSET, and its
617  * sync_xfer[] entry is initialized to the default/safe value. SS_UNSET
618  * means that the parameters are undetermined as yet, and that we
619  * need to send an SDTR message to this device after selection is
620  * complete: We set SS_FIRST to tell the interrupt routine to do so.
621  * If we've been asked not to try synchronous transfers on this
622  * target (and _all_ luns within it), we'll still send the SDTR message
623  * later, but at that time we'll negotiate for async by specifying a
624  * sync fifo depth of 0.
625  */
626                 if (hostdata->sync_stat[cmd->device->id] == SS_UNSET)
627                         hostdata->sync_stat[cmd->device->id] = SS_FIRST;
628                 hostdata->state = S_SELECTING;
629                 write_wd33c93_count(regs, 0);   /* guarantee a DATA_PHASE interrupt */
630                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN);
631         } else {
632
633                 /*
634                  * Do a 'Select-With-ATN-Xfer' command. This will end with
635                  * one of the following interrupts:
636                  *    CSR_RESEL_AM:  failure - can try again later.
637                  *    CSR_TIMEOUT:   failure - give up.
638                  *    anything else: success - proceed.
639                  */
640
641                 hostdata->connected = cmd;
642                 write_wd33c93(regs, WD_COMMAND_PHASE, 0);
643
644                 /* copy command_descriptor_block into WD chip
645                  * (take advantage of auto-incrementing)
646                  */
647
648                 write_wd33c93_cdb(regs, cmd->cmd_len, cmd->cmnd);
649
650                 /* The wd33c93 only knows about Group 0, 1, and 5 commands when
651                  * it's doing a 'select-and-transfer'. To be safe, we write the
652                  * size of the CDB into the OWN_ID register for every case. This
653                  * way there won't be problems with vendor-unique, audio, etc.
654                  */
655
656                 write_wd33c93(regs, WD_OWN_ID, cmd->cmd_len);
657
658                 /* When doing a non-disconnect command with DMA, we can save
659                  * ourselves a DATA phase interrupt later by setting everything
660                  * up ahead of time.
661                  */
662
663                 if ((cmd->SCp.phase == 0) && (hostdata->no_dma == 0)) {
664                         if (hostdata->dma_setup(cmd,
665                             (cmd->sc_data_direction == DMA_TO_DEVICE) ?
666                              DATA_OUT_DIR : DATA_IN_DIR))
667                                 write_wd33c93_count(regs, 0);   /* guarantee a DATA_PHASE interrupt */
668                         else {
669                                 write_wd33c93_count(regs,
670                                                     cmd->SCp.this_residual);
671                                 write_wd33c93(regs, WD_CONTROL,
672                                               CTRL_IDI | CTRL_EDI | hostdata->dma_mode);
673                                 hostdata->dma = D_DMA_RUNNING;
674                         }
675                 } else
676                         write_wd33c93_count(regs, 0);   /* guarantee a DATA_PHASE interrupt */
677
678                 hostdata->state = S_RUNNING_LEVEL2;
679                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
680         }
681
682         /*
683          * Since the SCSI bus can handle only 1 connection at a time,
684          * we get out of here now. If the selection fails, or when
685          * the command disconnects, we'll come back to this routine
686          * to search the input_Q again...
687          */
688
689         DB(DB_EXECUTE,
690            printk("%s%ld)EX-2 ", (cmd->SCp.phase) ? "d:" : "", cmd->serial_number))
691 }
692
693 static void
694 transfer_pio(const wd33c93_regs regs, uchar * buf, int cnt,
695              int data_in_dir, struct WD33C93_hostdata *hostdata)
696 {
697         uchar asr;
698
699         DB(DB_TRANSFER,
700            printk("(%p,%d,%s:", buf, cnt, data_in_dir ? "in" : "out"))
701
702         write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
703         write_wd33c93_count(regs, cnt);
704         write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
705         if (data_in_dir) {
706                 do {
707                         asr = read_aux_stat(regs);
708                         if (asr & ASR_DBR)
709                                 *buf++ = read_wd33c93(regs, WD_DATA);
710                 } while (!(asr & ASR_INT));
711         } else {
712                 do {
713                         asr = read_aux_stat(regs);
714                         if (asr & ASR_DBR)
715                                 write_wd33c93(regs, WD_DATA, *buf++);
716                 } while (!(asr & ASR_INT));
717         }
718
719         /* Note: we are returning with the interrupt UN-cleared.
720          * Since (presumably) an entire I/O operation has
721          * completed, the bus phase is probably different, and
722          * the interrupt routine will discover this when it
723          * responds to the uncleared int.
724          */
725
726 }
727
728 static void
729 transfer_bytes(const wd33c93_regs regs, struct scsi_cmnd *cmd,
730                 int data_in_dir)
731 {
732         struct WD33C93_hostdata *hostdata;
733         unsigned long length;
734
735         hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata;
736
737 /* Normally, you'd expect 'this_residual' to be non-zero here.
738  * In a series of scatter-gather transfers, however, this
739  * routine will usually be called with 'this_residual' equal
740  * to 0 and 'buffers_residual' non-zero. This means that a
741  * previous transfer completed, clearing 'this_residual', and
742  * now we need to setup the next scatter-gather buffer as the
743  * source or destination for THIS transfer.
744  */
745         if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
746                 ++cmd->SCp.buffer;
747                 --cmd->SCp.buffers_residual;
748                 cmd->SCp.this_residual = cmd->SCp.buffer->length;
749                 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
750         }
751         if (!cmd->SCp.this_residual) /* avoid bogus setups */
752                 return;
753
754         write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
755                       hostdata->sync_xfer[cmd->device->id]);
756
757 /* 'hostdata->no_dma' is TRUE if we don't even want to try DMA.
758  * Update 'this_residual' and 'ptr' after 'transfer_pio()' returns.
759  */
760
761         if (hostdata->no_dma || hostdata->dma_setup(cmd, data_in_dir)) {
762 #ifdef PROC_STATISTICS
763                 hostdata->pio_cnt++;
764 #endif
765                 transfer_pio(regs, (uchar *) cmd->SCp.ptr,
766                              cmd->SCp.this_residual, data_in_dir, hostdata);
767                 length = cmd->SCp.this_residual;
768                 cmd->SCp.this_residual = read_wd33c93_count(regs);
769                 cmd->SCp.ptr += (length - cmd->SCp.this_residual);
770         }
771
772 /* We are able to do DMA (in fact, the Amiga hardware is
773  * already going!), so start up the wd33c93 in DMA mode.
774  * We set 'hostdata->dma' = D_DMA_RUNNING so that when the
775  * transfer completes and causes an interrupt, we're
776  * reminded to tell the Amiga to shut down its end. We'll
777  * postpone the updating of 'this_residual' and 'ptr'
778  * until then.
779  */
780
781         else {
782 #ifdef PROC_STATISTICS
783                 hostdata->dma_cnt++;
784 #endif
785                 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | hostdata->dma_mode);
786                 write_wd33c93_count(regs, cmd->SCp.this_residual);
787
788                 if ((hostdata->level2 >= L2_DATA) ||
789                     (hostdata->level2 == L2_BASIC && cmd->SCp.phase == 0)) {
790                         write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
791                         write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
792                         hostdata->state = S_RUNNING_LEVEL2;
793                 } else
794                         write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
795
796                 hostdata->dma = D_DMA_RUNNING;
797         }
798 }
799
800 void
801 wd33c93_intr(struct Scsi_Host *instance)
802 {
803         struct WD33C93_hostdata *hostdata =
804             (struct WD33C93_hostdata *) instance->hostdata;
805         const wd33c93_regs regs = hostdata->regs;
806         struct scsi_cmnd *patch, *cmd;
807         uchar asr, sr, phs, id, lun, *ucp, msg;
808         unsigned long length, flags;
809
810         asr = read_aux_stat(regs);
811         if (!(asr & ASR_INT) || (asr & ASR_BSY))
812                 return;
813
814         spin_lock_irqsave(&hostdata->lock, flags);
815
816 #ifdef PROC_STATISTICS
817         hostdata->int_cnt++;
818 #endif
819
820         cmd = (struct scsi_cmnd *) hostdata->connected; /* assume we're connected */
821         sr = read_wd33c93(regs, WD_SCSI_STATUS);        /* clear the interrupt */
822         phs = read_wd33c93(regs, WD_COMMAND_PHASE);
823
824         DB(DB_INTR, printk("{%02x:%02x-", asr, sr))
825
826 /* After starting a DMA transfer, the next interrupt
827  * is guaranteed to be in response to completion of
828  * the transfer. Since the Amiga DMA hardware runs in
829  * in an open-ended fashion, it needs to be told when
830  * to stop; do that here if D_DMA_RUNNING is true.
831  * Also, we have to update 'this_residual' and 'ptr'
832  * based on the contents of the TRANSFER_COUNT register,
833  * in case the device decided to do an intermediate
834  * disconnect (a device may do this if it has to do a
835  * seek, or just to be nice and let other devices have
836  * some bus time during long transfers). After doing
837  * whatever is needed, we go on and service the WD3393
838  * interrupt normally.
839  */
840             if (hostdata->dma == D_DMA_RUNNING) {
841                 DB(DB_TRANSFER,
842                    printk("[%p/%d:", cmd->SCp.ptr, cmd->SCp.this_residual))
843                     hostdata->dma_stop(cmd->device->host, cmd, 1);
844                 hostdata->dma = D_DMA_OFF;
845                 length = cmd->SCp.this_residual;
846                 cmd->SCp.this_residual = read_wd33c93_count(regs);
847                 cmd->SCp.ptr += (length - cmd->SCp.this_residual);
848                 DB(DB_TRANSFER,
849                    printk("%p/%d]", cmd->SCp.ptr, cmd->SCp.this_residual))
850         }
851
852 /* Respond to the specific WD3393 interrupt - there are quite a few! */
853         switch (sr) {
854         case CSR_TIMEOUT:
855                 DB(DB_INTR, printk("TIMEOUT"))
856
857                     if (hostdata->state == S_RUNNING_LEVEL2)
858                         hostdata->connected = NULL;
859                 else {
860                         cmd = (struct scsi_cmnd *) hostdata->selecting; /* get a valid cmd */
861                         hostdata->selecting = NULL;
862                 }
863
864                 cmd->result = DID_NO_CONNECT << 16;
865                 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
866                 hostdata->state = S_UNCONNECTED;
867                 cmd->scsi_done(cmd);
868
869                 /* From esp.c:
870                  * There is a window of time within the scsi_done() path
871                  * of execution where interrupts are turned back on full
872                  * blast and left that way.  During that time we could
873                  * reconnect to a disconnected command, then we'd bomb
874                  * out below.  We could also end up executing two commands
875                  * at _once_.  ...just so you know why the restore_flags()
876                  * is here...
877                  */
878
879                 spin_unlock_irqrestore(&hostdata->lock, flags);
880
881 /* We are not connected to a target - check to see if there
882  * are commands waiting to be executed.
883  */
884
885                 wd33c93_execute(instance);
886                 break;
887
888 /* Note: this interrupt should not occur in a LEVEL2 command */
889
890         case CSR_SELECT:
891                 DB(DB_INTR, printk("SELECT"))
892                     hostdata->connected = cmd =
893                     (struct scsi_cmnd *) hostdata->selecting;
894                 hostdata->selecting = NULL;
895
896                 /* construct an IDENTIFY message with correct disconnect bit */
897
898                 hostdata->outgoing_msg[0] = (0x80 | 0x00 | cmd->device->lun);
899                 if (cmd->SCp.phase)
900                         hostdata->outgoing_msg[0] |= 0x40;
901
902                 if (hostdata->sync_stat[cmd->device->id] == SS_FIRST) {
903
904                         hostdata->sync_stat[cmd->device->id] = SS_WAITING;
905
906 /* Tack on a 2nd message to ask about synchronous transfers. If we've
907  * been asked to do only asynchronous transfers on this device, we
908  * request a fifo depth of 0, which is equivalent to async - should
909  * solve the problems some people have had with GVP's Guru ROM.
910  */
911
912                         hostdata->outgoing_msg[1] = EXTENDED_MESSAGE;
913                         hostdata->outgoing_msg[2] = 3;
914                         hostdata->outgoing_msg[3] = EXTENDED_SDTR;
915                         if (hostdata->no_sync & (1 << cmd->device->id)) {
916                                 calc_sync_msg(hostdata->default_sx_per, 0,
917                                                 0, hostdata->outgoing_msg + 4);
918                         } else {
919                                 calc_sync_msg(optimum_sx_per(hostdata),
920                                                 OPTIMUM_SX_OFF,
921                                                 hostdata->fast,
922                                                 hostdata->outgoing_msg + 4);
923                         }
924                         hostdata->outgoing_len = 6;
925 #ifdef SYNC_DEBUG
926                         ucp = hostdata->outgoing_msg + 1;
927                         printk(" sending SDTR %02x03%02x%02x%02x ",
928                                 ucp[0], ucp[2], ucp[3], ucp[4]);
929 #endif
930                 } else
931                         hostdata->outgoing_len = 1;
932
933                 hostdata->state = S_CONNECTED;
934                 spin_unlock_irqrestore(&hostdata->lock, flags);
935                 break;
936
937         case CSR_XFER_DONE | PHS_DATA_IN:
938         case CSR_UNEXP | PHS_DATA_IN:
939         case CSR_SRV_REQ | PHS_DATA_IN:
940                 DB(DB_INTR,
941                    printk("IN-%d.%d", cmd->SCp.this_residual,
942                           cmd->SCp.buffers_residual))
943                     transfer_bytes(regs, cmd, DATA_IN_DIR);
944                 if (hostdata->state != S_RUNNING_LEVEL2)
945                         hostdata->state = S_CONNECTED;
946                 spin_unlock_irqrestore(&hostdata->lock, flags);
947                 break;
948
949         case CSR_XFER_DONE | PHS_DATA_OUT:
950         case CSR_UNEXP | PHS_DATA_OUT:
951         case CSR_SRV_REQ | PHS_DATA_OUT:
952                 DB(DB_INTR,
953                    printk("OUT-%d.%d", cmd->SCp.this_residual,
954                           cmd->SCp.buffers_residual))
955                     transfer_bytes(regs, cmd, DATA_OUT_DIR);
956                 if (hostdata->state != S_RUNNING_LEVEL2)
957                         hostdata->state = S_CONNECTED;
958                 spin_unlock_irqrestore(&hostdata->lock, flags);
959                 break;
960
961 /* Note: this interrupt should not occur in a LEVEL2 command */
962
963         case CSR_XFER_DONE | PHS_COMMAND:
964         case CSR_UNEXP | PHS_COMMAND:
965         case CSR_SRV_REQ | PHS_COMMAND:
966                 DB(DB_INTR, printk("CMND-%02x,%ld", cmd->cmnd[0], cmd->serial_number))
967                     transfer_pio(regs, cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR,
968                                  hostdata);
969                 hostdata->state = S_CONNECTED;
970                 spin_unlock_irqrestore(&hostdata->lock, flags);
971                 break;
972
973         case CSR_XFER_DONE | PHS_STATUS:
974         case CSR_UNEXP | PHS_STATUS:
975         case CSR_SRV_REQ | PHS_STATUS:
976                 DB(DB_INTR, printk("STATUS="))
977                 cmd->SCp.Status = read_1_byte(regs);
978                 DB(DB_INTR, printk("%02x", cmd->SCp.Status))
979                     if (hostdata->level2 >= L2_BASIC) {
980                         sr = read_wd33c93(regs, WD_SCSI_STATUS);        /* clear interrupt */
981                         udelay(7);
982                         hostdata->state = S_RUNNING_LEVEL2;
983                         write_wd33c93(regs, WD_COMMAND_PHASE, 0x50);
984                         write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
985                 } else {
986                         hostdata->state = S_CONNECTED;
987                 }
988                 spin_unlock_irqrestore(&hostdata->lock, flags);
989                 break;
990
991         case CSR_XFER_DONE | PHS_MESS_IN:
992         case CSR_UNEXP | PHS_MESS_IN:
993         case CSR_SRV_REQ | PHS_MESS_IN:
994                 DB(DB_INTR, printk("MSG_IN="))
995
996                 msg = read_1_byte(regs);
997                 sr = read_wd33c93(regs, WD_SCSI_STATUS);        /* clear interrupt */
998                 udelay(7);
999
1000                 hostdata->incoming_msg[hostdata->incoming_ptr] = msg;
1001                 if (hostdata->incoming_msg[0] == EXTENDED_MESSAGE)
1002                         msg = EXTENDED_MESSAGE;
1003                 else
1004                         hostdata->incoming_ptr = 0;
1005
1006                 cmd->SCp.Message = msg;
1007                 switch (msg) {
1008
1009                 case COMMAND_COMPLETE:
1010                         DB(DB_INTR, printk("CCMP-%ld", cmd->serial_number))
1011                             write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1012                         hostdata->state = S_PRE_CMP_DISC;
1013                         break;
1014
1015                 case SAVE_POINTERS:
1016                         DB(DB_INTR, printk("SDP"))
1017                             write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1018                         hostdata->state = S_CONNECTED;
1019                         break;
1020
1021                 case RESTORE_POINTERS:
1022                         DB(DB_INTR, printk("RDP"))
1023                             if (hostdata->level2 >= L2_BASIC) {
1024                                 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
1025                                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1026                                 hostdata->state = S_RUNNING_LEVEL2;
1027                         } else {
1028                                 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1029                                 hostdata->state = S_CONNECTED;
1030                         }
1031                         break;
1032
1033                 case DISCONNECT:
1034                         DB(DB_INTR, printk("DIS"))
1035                             cmd->device->disconnect = 1;
1036                         write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1037                         hostdata->state = S_PRE_TMP_DISC;
1038                         break;
1039
1040                 case MESSAGE_REJECT:
1041                         DB(DB_INTR, printk("REJ"))
1042 #ifdef SYNC_DEBUG
1043                             printk("-REJ-");
1044 #endif
1045                         if (hostdata->sync_stat[cmd->device->id] == SS_WAITING) {
1046                                 hostdata->sync_stat[cmd->device->id] = SS_SET;
1047                                 /* we want default_sx_per, not DEFAULT_SX_PER */
1048                                 hostdata->sync_xfer[cmd->device->id] =
1049                                         calc_sync_xfer(hostdata->default_sx_per
1050                                                 / 4, 0, 0, hostdata->sx_table);
1051                         }
1052                         write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1053                         hostdata->state = S_CONNECTED;
1054                         break;
1055
1056                 case EXTENDED_MESSAGE:
1057                         DB(DB_INTR, printk("EXT"))
1058
1059                             ucp = hostdata->incoming_msg;
1060
1061 #ifdef SYNC_DEBUG
1062                         printk("%02x", ucp[hostdata->incoming_ptr]);
1063 #endif
1064                         /* Is this the last byte of the extended message? */
1065
1066                         if ((hostdata->incoming_ptr >= 2) &&
1067                             (hostdata->incoming_ptr == (ucp[1] + 1))) {
1068
1069                                 switch (ucp[2]) {       /* what's the EXTENDED code? */
1070                                 case EXTENDED_SDTR:
1071                                         /* default to default async period */
1072                                         id = calc_sync_xfer(hostdata->
1073                                                         default_sx_per / 4, 0,
1074                                                         0, hostdata->sx_table);
1075                                         if (hostdata->sync_stat[cmd->device->id] !=
1076                                             SS_WAITING) {
1077
1078 /* A device has sent an unsolicited SDTR message; rather than go
1079  * through the effort of decoding it and then figuring out what
1080  * our reply should be, we're just gonna say that we have a
1081  * synchronous fifo depth of 0. This will result in asynchronous
1082  * transfers - not ideal but so much easier.
1083  * Actually, this is OK because it assures us that if we don't
1084  * specifically ask for sync transfers, we won't do any.
1085  */
1086
1087                                                 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1088                                                 hostdata->outgoing_msg[0] =
1089                                                     EXTENDED_MESSAGE;
1090                                                 hostdata->outgoing_msg[1] = 3;
1091                                                 hostdata->outgoing_msg[2] =
1092                                                     EXTENDED_SDTR;
1093                                                 calc_sync_msg(hostdata->
1094                                                         default_sx_per, 0,
1095                                                         0, hostdata->outgoing_msg + 3);
1096                                                 hostdata->outgoing_len = 5;
1097                                         } else {
1098                                                 if (ucp[4]) /* well, sync transfer */
1099                                                         id = calc_sync_xfer(ucp[3], ucp[4],
1100                                                                         hostdata->fast,
1101                                                                         hostdata->sx_table);
1102                                                 else if (ucp[3]) /* very unlikely... */
1103                                                         id = calc_sync_xfer(ucp[3], ucp[4],
1104                                                                         0, hostdata->sx_table);
1105                                         }
1106                                         hostdata->sync_xfer[cmd->device->id] = id;
1107 #ifdef SYNC_DEBUG
1108                                         printk(" sync_xfer=%02x\n",
1109                                                hostdata->sync_xfer[cmd->device->id]);
1110 #endif
1111                                         hostdata->sync_stat[cmd->device->id] =
1112                                             SS_SET;
1113                                         write_wd33c93_cmd(regs,
1114                                                           WD_CMD_NEGATE_ACK);
1115                                         hostdata->state = S_CONNECTED;
1116                                         break;
1117                                 case EXTENDED_WDTR:
1118                                         write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1119                                         printk("sending WDTR ");
1120                                         hostdata->outgoing_msg[0] =
1121                                             EXTENDED_MESSAGE;
1122                                         hostdata->outgoing_msg[1] = 2;
1123                                         hostdata->outgoing_msg[2] =
1124                                             EXTENDED_WDTR;
1125                                         hostdata->outgoing_msg[3] = 0;  /* 8 bit transfer width */
1126                                         hostdata->outgoing_len = 4;
1127                                         write_wd33c93_cmd(regs,
1128                                                           WD_CMD_NEGATE_ACK);
1129                                         hostdata->state = S_CONNECTED;
1130                                         break;
1131                                 default:
1132                                         write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1133                                         printk
1134                                             ("Rejecting Unknown Extended Message(%02x). ",
1135                                              ucp[2]);
1136                                         hostdata->outgoing_msg[0] =
1137                                             MESSAGE_REJECT;
1138                                         hostdata->outgoing_len = 1;
1139                                         write_wd33c93_cmd(regs,
1140                                                           WD_CMD_NEGATE_ACK);
1141                                         hostdata->state = S_CONNECTED;
1142                                         break;
1143                                 }
1144                                 hostdata->incoming_ptr = 0;
1145                         }
1146
1147                         /* We need to read more MESS_IN bytes for the extended message */
1148
1149                         else {
1150                                 hostdata->incoming_ptr++;
1151                                 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1152                                 hostdata->state = S_CONNECTED;
1153                         }
1154                         break;
1155
1156                 default:
1157                         printk("Rejecting Unknown Message(%02x) ", msg);
1158                         write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1159                         hostdata->outgoing_msg[0] = MESSAGE_REJECT;
1160                         hostdata->outgoing_len = 1;
1161                         write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1162                         hostdata->state = S_CONNECTED;
1163                 }
1164                 spin_unlock_irqrestore(&hostdata->lock, flags);
1165                 break;
1166
1167 /* Note: this interrupt will occur only after a LEVEL2 command */
1168
1169         case CSR_SEL_XFER_DONE:
1170
1171 /* Make sure that reselection is enabled at this point - it may
1172  * have been turned off for the command that just completed.
1173  */
1174
1175                 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1176                 if (phs == 0x60) {
1177                         DB(DB_INTR, printk("SX-DONE-%ld", cmd->serial_number))
1178                             cmd->SCp.Message = COMMAND_COMPLETE;
1179                         lun = read_wd33c93(regs, WD_TARGET_LUN);
1180                         DB(DB_INTR, printk(":%d.%d", cmd->SCp.Status, lun))
1181                             hostdata->connected = NULL;
1182                         hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1183                         hostdata->state = S_UNCONNECTED;
1184                         if (cmd->SCp.Status == ILLEGAL_STATUS_BYTE)
1185                                 cmd->SCp.Status = lun;
1186                         if (cmd->cmnd[0] == REQUEST_SENSE
1187                             && cmd->SCp.Status != GOOD)
1188                                 cmd->result =
1189                                     (cmd->
1190                                      result & 0x00ffff) | (DID_ERROR << 16);
1191                         else
1192                                 cmd->result =
1193                                     cmd->SCp.Status | (cmd->SCp.Message << 8);
1194                         cmd->scsi_done(cmd);
1195
1196 /* We are no longer  connected to a target - check to see if
1197  * there are commands waiting to be executed.
1198  */
1199                         spin_unlock_irqrestore(&hostdata->lock, flags);
1200                         wd33c93_execute(instance);
1201                 } else {
1202                         printk
1203                             ("%02x:%02x:%02x-%ld: Unknown SEL_XFER_DONE phase!!---",
1204                              asr, sr, phs, cmd->serial_number);
1205                         spin_unlock_irqrestore(&hostdata->lock, flags);
1206                 }
1207                 break;
1208
1209 /* Note: this interrupt will occur only after a LEVEL2 command */
1210
1211         case CSR_SDP:
1212                 DB(DB_INTR, printk("SDP"))
1213                     hostdata->state = S_RUNNING_LEVEL2;
1214                 write_wd33c93(regs, WD_COMMAND_PHASE, 0x41);
1215                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1216                 spin_unlock_irqrestore(&hostdata->lock, flags);
1217                 break;
1218
1219         case CSR_XFER_DONE | PHS_MESS_OUT:
1220         case CSR_UNEXP | PHS_MESS_OUT:
1221         case CSR_SRV_REQ | PHS_MESS_OUT:
1222                 DB(DB_INTR, printk("MSG_OUT="))
1223
1224 /* To get here, we've probably requested MESSAGE_OUT and have
1225  * already put the correct bytes in outgoing_msg[] and filled
1226  * in outgoing_len. We simply send them out to the SCSI bus.
1227  * Sometimes we get MESSAGE_OUT phase when we're not expecting
1228  * it - like when our SDTR message is rejected by a target. Some
1229  * targets send the REJECT before receiving all of the extended
1230  * message, and then seem to go back to MESSAGE_OUT for a byte
1231  * or two. Not sure why, or if I'm doing something wrong to
1232  * cause this to happen. Regardless, it seems that sending
1233  * NOP messages in these situations results in no harm and
1234  * makes everyone happy.
1235  */
1236                     if (hostdata->outgoing_len == 0) {
1237                         hostdata->outgoing_len = 1;
1238                         hostdata->outgoing_msg[0] = NOP;
1239                 }
1240                 transfer_pio(regs, hostdata->outgoing_msg,
1241                              hostdata->outgoing_len, DATA_OUT_DIR, hostdata);
1242                 DB(DB_INTR, printk("%02x", hostdata->outgoing_msg[0]))
1243                     hostdata->outgoing_len = 0;
1244                 hostdata->state = S_CONNECTED;
1245                 spin_unlock_irqrestore(&hostdata->lock, flags);
1246                 break;
1247
1248         case CSR_UNEXP_DISC:
1249
1250 /* I think I've seen this after a request-sense that was in response
1251  * to an error condition, but not sure. We certainly need to do
1252  * something when we get this interrupt - the question is 'what?'.
1253  * Let's think positively, and assume some command has finished
1254  * in a legal manner (like a command that provokes a request-sense),
1255  * so we treat it as a normal command-complete-disconnect.
1256  */
1257
1258 /* Make sure that reselection is enabled at this point - it may
1259  * have been turned off for the command that just completed.
1260  */
1261
1262                 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1263                 if (cmd == NULL) {
1264                         printk(" - Already disconnected! ");
1265                         hostdata->state = S_UNCONNECTED;
1266                         spin_unlock_irqrestore(&hostdata->lock, flags);
1267                         return;
1268                 }
1269                 DB(DB_INTR, printk("UNEXP_DISC-%ld", cmd->serial_number))
1270                     hostdata->connected = NULL;
1271                 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1272                 hostdata->state = S_UNCONNECTED;
1273                 if (cmd->cmnd[0] == REQUEST_SENSE && cmd->SCp.Status != GOOD)
1274                         cmd->result =
1275                             (cmd->result & 0x00ffff) | (DID_ERROR << 16);
1276                 else
1277                         cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
1278                 cmd->scsi_done(cmd);
1279
1280 /* We are no longer connected to a target - check to see if
1281  * there are commands waiting to be executed.
1282  */
1283                 /* look above for comments on scsi_done() */
1284                 spin_unlock_irqrestore(&hostdata->lock, flags);
1285                 wd33c93_execute(instance);
1286                 break;
1287
1288         case CSR_DISC:
1289
1290 /* Make sure that reselection is enabled at this point - it may
1291  * have been turned off for the command that just completed.
1292  */
1293
1294                 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1295                 DB(DB_INTR, printk("DISC-%ld", cmd->serial_number))
1296                     if (cmd == NULL) {
1297                         printk(" - Already disconnected! ");
1298                         hostdata->state = S_UNCONNECTED;
1299                 }
1300                 switch (hostdata->state) {
1301                 case S_PRE_CMP_DISC:
1302                         hostdata->connected = NULL;
1303                         hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1304                         hostdata->state = S_UNCONNECTED;
1305                         DB(DB_INTR, printk(":%d", cmd->SCp.Status))
1306                             if (cmd->cmnd[0] == REQUEST_SENSE
1307                                 && cmd->SCp.Status != GOOD)
1308                                 cmd->result =
1309                                     (cmd->
1310                                      result & 0x00ffff) | (DID_ERROR << 16);
1311                         else
1312                                 cmd->result =
1313                                     cmd->SCp.Status | (cmd->SCp.Message << 8);
1314                         cmd->scsi_done(cmd);
1315                         break;
1316                 case S_PRE_TMP_DISC:
1317                 case S_RUNNING_LEVEL2:
1318                         cmd->host_scribble = (uchar *) hostdata->disconnected_Q;
1319                         hostdata->disconnected_Q = cmd;
1320                         hostdata->connected = NULL;
1321                         hostdata->state = S_UNCONNECTED;
1322
1323 #ifdef PROC_STATISTICS
1324                         hostdata->disc_done_cnt[cmd->device->id]++;
1325 #endif
1326
1327                         break;
1328                 default:
1329                         printk("*** Unexpected DISCONNECT interrupt! ***");
1330                         hostdata->state = S_UNCONNECTED;
1331                 }
1332
1333 /* We are no longer connected to a target - check to see if
1334  * there are commands waiting to be executed.
1335  */
1336                 spin_unlock_irqrestore(&hostdata->lock, flags);
1337                 wd33c93_execute(instance);
1338                 break;
1339
1340         case CSR_RESEL_AM:
1341         case CSR_RESEL:
1342                 DB(DB_INTR, printk("RESEL%s", sr == CSR_RESEL_AM ? "_AM" : ""))
1343
1344                     /* Old chips (pre -A ???) don't have advanced features and will
1345                      * generate CSR_RESEL.  In that case we have to extract the LUN the
1346                      * hard way (see below).
1347                      * First we have to make sure this reselection didn't
1348                      * happen during Arbitration/Selection of some other device.
1349                      * If yes, put losing command back on top of input_Q.
1350                      */
1351                     if (hostdata->level2 <= L2_NONE) {
1352
1353                         if (hostdata->selecting) {
1354                                 cmd = (struct scsi_cmnd *) hostdata->selecting;
1355                                 hostdata->selecting = NULL;
1356                                 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1357                                 cmd->host_scribble =
1358                                     (uchar *) hostdata->input_Q;
1359                                 hostdata->input_Q = cmd;
1360                         }
1361                 }
1362
1363                 else {
1364
1365                         if (cmd) {
1366                                 if (phs == 0x00) {
1367                                         hostdata->busy[cmd->device->id] &=
1368                                             ~(1 << cmd->device->lun);
1369                                         cmd->host_scribble =
1370                                             (uchar *) hostdata->input_Q;
1371                                         hostdata->input_Q = cmd;
1372                                 } else {
1373                                         printk
1374                                             ("---%02x:%02x:%02x-TROUBLE: Intrusive ReSelect!---",
1375                                              asr, sr, phs);
1376                                         while (1)
1377                                                 printk("\r");
1378                                 }
1379                         }
1380
1381                 }
1382
1383                 /* OK - find out which device reselected us. */
1384
1385                 id = read_wd33c93(regs, WD_SOURCE_ID);
1386                 id &= SRCID_MASK;
1387
1388                 /* and extract the lun from the ID message. (Note that we don't
1389                  * bother to check for a valid message here - I guess this is
1390                  * not the right way to go, but...)
1391                  */
1392
1393                 if (sr == CSR_RESEL_AM) {
1394                         lun = read_wd33c93(regs, WD_DATA);
1395                         if (hostdata->level2 < L2_RESELECT)
1396                                 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1397                         lun &= 7;
1398                 } else {
1399                         /* Old chip; wait for msgin phase to pick up the LUN. */
1400                         for (lun = 255; lun; lun--) {
1401                                 if ((asr = read_aux_stat(regs)) & ASR_INT)
1402                                         break;
1403                                 udelay(10);
1404                         }
1405                         if (!(asr & ASR_INT)) {
1406                                 printk
1407                                     ("wd33c93: Reselected without IDENTIFY\n");
1408                                 lun = 0;
1409                         } else {
1410                                 /* Verify this is a change to MSG_IN and read the message */
1411                                 sr = read_wd33c93(regs, WD_SCSI_STATUS);
1412                                 udelay(7);
1413                                 if (sr == (CSR_ABORT | PHS_MESS_IN) ||
1414                                     sr == (CSR_UNEXP | PHS_MESS_IN) ||
1415                                     sr == (CSR_SRV_REQ | PHS_MESS_IN)) {
1416                                         /* Got MSG_IN, grab target LUN */
1417                                         lun = read_1_byte(regs);
1418                                         /* Now we expect a 'paused with ACK asserted' int.. */
1419                                         asr = read_aux_stat(regs);
1420                                         if (!(asr & ASR_INT)) {
1421                                                 udelay(10);
1422                                                 asr = read_aux_stat(regs);
1423                                                 if (!(asr & ASR_INT))
1424                                                         printk
1425                                                             ("wd33c93: No int after LUN on RESEL (%02x)\n",
1426                                                              asr);
1427                                         }
1428                                         sr = read_wd33c93(regs, WD_SCSI_STATUS);
1429                                         udelay(7);
1430                                         if (sr != CSR_MSGIN)
1431                                                 printk
1432                                                     ("wd33c93: Not paused with ACK on RESEL (%02x)\n",
1433                                                      sr);
1434                                         lun &= 7;
1435                                         write_wd33c93_cmd(regs,
1436                                                           WD_CMD_NEGATE_ACK);
1437                                 } else {
1438                                         printk
1439                                             ("wd33c93: Not MSG_IN on reselect (%02x)\n",
1440                                              sr);
1441                                         lun = 0;
1442                                 }
1443                         }
1444                 }
1445
1446                 /* Now we look for the command that's reconnecting. */
1447
1448                 cmd = (struct scsi_cmnd *) hostdata->disconnected_Q;
1449                 patch = NULL;
1450                 while (cmd) {
1451                         if (id == cmd->device->id && lun == cmd->device->lun)
1452                                 break;
1453                         patch = cmd;
1454                         cmd = (struct scsi_cmnd *) cmd->host_scribble;
1455                 }
1456
1457                 /* Hmm. Couldn't find a valid command.... What to do? */
1458
1459                 if (!cmd) {
1460                         printk
1461                             ("---TROUBLE: target %d.%d not in disconnect queue---",
1462                              id, lun);
1463                         spin_unlock_irqrestore(&hostdata->lock, flags);
1464                         return;
1465                 }
1466
1467                 /* Ok, found the command - now start it up again. */
1468
1469                 if (patch)
1470                         patch->host_scribble = cmd->host_scribble;
1471                 else
1472                         hostdata->disconnected_Q =
1473                             (struct scsi_cmnd *) cmd->host_scribble;
1474                 hostdata->connected = cmd;
1475
1476                 /* We don't need to worry about 'initialize_SCp()' or 'hostdata->busy[]'
1477                  * because these things are preserved over a disconnect.
1478                  * But we DO need to fix the DPD bit so it's correct for this command.
1479                  */
1480
1481                 if (cmd->sc_data_direction == DMA_TO_DEVICE)
1482                         write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);
1483                 else
1484                         write_wd33c93(regs, WD_DESTINATION_ID,
1485                                       cmd->device->id | DSTID_DPD);
1486                 if (hostdata->level2 >= L2_RESELECT) {
1487                         write_wd33c93_count(regs, 0);   /* we want a DATA_PHASE interrupt */
1488                         write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
1489                         write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1490                         hostdata->state = S_RUNNING_LEVEL2;
1491                 } else
1492                         hostdata->state = S_CONNECTED;
1493
1494                 DB(DB_INTR, printk("-%ld", cmd->serial_number))
1495                     spin_unlock_irqrestore(&hostdata->lock, flags);
1496                 break;
1497
1498         default:
1499                 printk("--UNKNOWN INTERRUPT:%02x:%02x:%02x--", asr, sr, phs);
1500                 spin_unlock_irqrestore(&hostdata->lock, flags);
1501         }
1502
1503         DB(DB_INTR, printk("} "))
1504
1505 }
1506
1507 static void
1508 reset_wd33c93(struct Scsi_Host *instance)
1509 {
1510         struct WD33C93_hostdata *hostdata =
1511             (struct WD33C93_hostdata *) instance->hostdata;
1512         const wd33c93_regs regs = hostdata->regs;
1513         uchar sr;
1514
1515 #ifdef CONFIG_SGI_IP22
1516         {
1517                 int busycount = 0;
1518                 extern void sgiwd93_reset(unsigned long);
1519                 /* wait 'til the chip gets some time for us */
1520                 while ((read_aux_stat(regs) & ASR_BSY) && busycount++ < 100)
1521                         udelay (10);
1522         /*
1523          * there are scsi devices out there, which manage to lock up
1524          * the wd33c93 in a busy condition. In this state it won't
1525          * accept the reset command. The only way to solve this is to
1526          * give the chip a hardware reset (if possible). The code below
1527          * does this for the SGI Indy, where this is possible
1528          */
1529         /* still busy ? */
1530         if (read_aux_stat(regs) & ASR_BSY)
1531                 sgiwd93_reset(instance->base); /* yeah, give it the hard one */
1532         }
1533 #endif
1534
1535         write_wd33c93(regs, WD_OWN_ID, OWNID_EAF | OWNID_RAF |
1536                       instance->this_id | hostdata->clock_freq);
1537         write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1538         write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
1539                       calc_sync_xfer(hostdata->default_sx_per / 4,
1540                                      DEFAULT_SX_OFF, 0, hostdata->sx_table));
1541         write_wd33c93(regs, WD_COMMAND, WD_CMD_RESET);
1542
1543
1544 #ifdef CONFIG_MVME147_SCSI
1545         udelay(25);             /* The old wd33c93 on MVME147 needs this, at least */
1546 #endif
1547
1548         while (!(read_aux_stat(regs) & ASR_INT))
1549                 ;
1550         sr = read_wd33c93(regs, WD_SCSI_STATUS);
1551
1552         hostdata->microcode = read_wd33c93(regs, WD_CDB_1);
1553         if (sr == 0x00)
1554                 hostdata->chip = C_WD33C93;
1555         else if (sr == 0x01) {
1556                 write_wd33c93(regs, WD_QUEUE_TAG, 0xa5);        /* any random number */
1557                 sr = read_wd33c93(regs, WD_QUEUE_TAG);
1558                 if (sr == 0xa5) {
1559                         hostdata->chip = C_WD33C93B;
1560                         write_wd33c93(regs, WD_QUEUE_TAG, 0);
1561                 } else
1562                         hostdata->chip = C_WD33C93A;
1563         } else
1564                 hostdata->chip = C_UNKNOWN_CHIP;
1565
1566         if (hostdata->chip != C_WD33C93B)       /* Fast SCSI unavailable */
1567                 hostdata->fast = 0;
1568
1569         write_wd33c93(regs, WD_TIMEOUT_PERIOD, TIMEOUT_PERIOD_VALUE);
1570         write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1571 }
1572
1573 int
1574 wd33c93_host_reset(struct scsi_cmnd * SCpnt)
1575 {
1576         struct Scsi_Host *instance;
1577         struct WD33C93_hostdata *hostdata;
1578         int i;
1579
1580         instance = SCpnt->device->host;
1581         hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1582
1583         printk("scsi%d: reset. ", instance->host_no);
1584         disable_irq(instance->irq);
1585
1586         hostdata->dma_stop(instance, NULL, 0);
1587         for (i = 0; i < 8; i++) {
1588                 hostdata->busy[i] = 0;
1589                 hostdata->sync_xfer[i] =
1590                         calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF,
1591                                         0, hostdata->sx_table);
1592                 hostdata->sync_stat[i] = SS_UNSET;      /* using default sync values */
1593         }
1594         hostdata->input_Q = NULL;
1595         hostdata->selecting = NULL;
1596         hostdata->connected = NULL;
1597         hostdata->disconnected_Q = NULL;
1598         hostdata->state = S_UNCONNECTED;
1599         hostdata->dma = D_DMA_OFF;
1600         hostdata->incoming_ptr = 0;
1601         hostdata->outgoing_len = 0;
1602
1603         reset_wd33c93(instance);
1604         SCpnt->result = DID_RESET << 16;
1605         enable_irq(instance->irq);
1606         return SUCCESS;
1607 }
1608
1609 int
1610 wd33c93_abort(struct scsi_cmnd * cmd)
1611 {
1612         struct Scsi_Host *instance;
1613         struct WD33C93_hostdata *hostdata;
1614         wd33c93_regs regs;
1615         struct scsi_cmnd *tmp, *prev;
1616
1617         disable_irq(cmd->device->host->irq);
1618
1619         instance = cmd->device->host;
1620         hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1621         regs = hostdata->regs;
1622
1623 /*
1624  * Case 1 : If the command hasn't been issued yet, we simply remove it
1625  *     from the input_Q.
1626  */
1627
1628         tmp = (struct scsi_cmnd *) hostdata->input_Q;
1629         prev = NULL;
1630         while (tmp) {
1631                 if (tmp == cmd) {
1632                         if (prev)
1633                                 prev->host_scribble = cmd->host_scribble;
1634                         else
1635                                 hostdata->input_Q =
1636                                     (struct scsi_cmnd *) cmd->host_scribble;
1637                         cmd->host_scribble = NULL;
1638                         cmd->result = DID_ABORT << 16;
1639                         printk
1640                             ("scsi%d: Abort - removing command %ld from input_Q. ",
1641                              instance->host_no, cmd->serial_number);
1642                         enable_irq(cmd->device->host->irq);
1643                         cmd->scsi_done(cmd);
1644                         return SUCCESS;
1645                 }
1646                 prev = tmp;
1647                 tmp = (struct scsi_cmnd *) tmp->host_scribble;
1648         }
1649
1650 /*
1651  * Case 2 : If the command is connected, we're going to fail the abort
1652  *     and let the high level SCSI driver retry at a later time or
1653  *     issue a reset.
1654  *
1655  *     Timeouts, and therefore aborted commands, will be highly unlikely
1656  *     and handling them cleanly in this situation would make the common
1657  *     case of noresets less efficient, and would pollute our code.  So,
1658  *     we fail.
1659  */
1660
1661         if (hostdata->connected == cmd) {
1662                 uchar sr, asr;
1663                 unsigned long timeout;
1664
1665                 printk("scsi%d: Aborting connected command %ld - ",
1666                        instance->host_no, cmd->serial_number);
1667
1668                 printk("stopping DMA - ");
1669                 if (hostdata->dma == D_DMA_RUNNING) {
1670                         hostdata->dma_stop(instance, cmd, 0);
1671                         hostdata->dma = D_DMA_OFF;
1672                 }
1673
1674                 printk("sending wd33c93 ABORT command - ");
1675                 write_wd33c93(regs, WD_CONTROL,
1676                               CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1677                 write_wd33c93_cmd(regs, WD_CMD_ABORT);
1678
1679 /* Now we have to attempt to flush out the FIFO... */
1680
1681                 printk("flushing fifo - ");
1682                 timeout = 1000000;
1683                 do {
1684                         asr = read_aux_stat(regs);
1685                         if (asr & ASR_DBR)
1686                                 read_wd33c93(regs, WD_DATA);
1687                 } while (!(asr & ASR_INT) && timeout-- > 0);
1688                 sr = read_wd33c93(regs, WD_SCSI_STATUS);
1689                 printk
1690                     ("asr=%02x, sr=%02x, %ld bytes un-transferred (timeout=%ld) - ",
1691                      asr, sr, read_wd33c93_count(regs), timeout);
1692
1693                 /*
1694                  * Abort command processed.
1695                  * Still connected.
1696                  * We must disconnect.
1697                  */
1698
1699                 printk("sending wd33c93 DISCONNECT command - ");
1700                 write_wd33c93_cmd(regs, WD_CMD_DISCONNECT);
1701
1702                 timeout = 1000000;
1703                 asr = read_aux_stat(regs);
1704                 while ((asr & ASR_CIP) && timeout-- > 0)
1705                         asr = read_aux_stat(regs);
1706                 sr = read_wd33c93(regs, WD_SCSI_STATUS);
1707                 printk("asr=%02x, sr=%02x.", asr, sr);
1708
1709                 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
1710                 hostdata->connected = NULL;
1711                 hostdata->state = S_UNCONNECTED;
1712                 cmd->result = DID_ABORT << 16;
1713
1714 /*      sti();*/
1715                 wd33c93_execute(instance);
1716
1717                 enable_irq(cmd->device->host->irq);
1718                 cmd->scsi_done(cmd);
1719                 return SUCCESS;
1720         }
1721
1722 /*
1723  * Case 3: If the command is currently disconnected from the bus,
1724  * we're not going to expend much effort here: Let's just return
1725  * an ABORT_SNOOZE and hope for the best...
1726  */
1727
1728         tmp = (struct scsi_cmnd *) hostdata->disconnected_Q;
1729         while (tmp) {
1730                 if (tmp == cmd) {
1731                         printk
1732                             ("scsi%d: Abort - command %ld found on disconnected_Q - ",
1733                              instance->host_no, cmd->serial_number);
1734                         printk("Abort SNOOZE. ");
1735                         enable_irq(cmd->device->host->irq);
1736                         return FAILED;
1737                 }
1738                 tmp = (struct scsi_cmnd *) tmp->host_scribble;
1739         }
1740
1741 /*
1742  * Case 4 : If we reached this point, the command was not found in any of
1743  *     the queues.
1744  *
1745  * We probably reached this point because of an unlikely race condition
1746  * between the command completing successfully and the abortion code,
1747  * so we won't panic, but we will notify the user in case something really
1748  * broke.
1749  */
1750
1751 /*   sti();*/
1752         wd33c93_execute(instance);
1753
1754         enable_irq(cmd->device->host->irq);
1755         printk("scsi%d: warning : SCSI command probably completed successfully"
1756                "         before abortion. ", instance->host_no);
1757         return FAILED;
1758 }
1759
1760 #define MAX_WD33C93_HOSTS 4
1761 #define MAX_SETUP_ARGS ARRAY_SIZE(setup_args)
1762 #define SETUP_BUFFER_SIZE 200
1763 static char setup_buffer[SETUP_BUFFER_SIZE];
1764 static char setup_used[MAX_SETUP_ARGS];
1765 static int done_setup = 0;
1766
1767 static int
1768 wd33c93_setup(char *str)
1769 {
1770         int i;
1771         char *p1, *p2;
1772
1773         /* The kernel does some processing of the command-line before calling
1774          * this function: If it begins with any decimal or hex number arguments,
1775          * ints[0] = how many numbers found and ints[1] through [n] are the values
1776          * themselves. str points to where the non-numeric arguments (if any)
1777          * start: We do our own parsing of those. We construct synthetic 'nosync'
1778          * keywords out of numeric args (to maintain compatibility with older
1779          * versions) and then add the rest of the arguments.
1780          */
1781
1782         p1 = setup_buffer;
1783         *p1 = '\0';
1784         if (str)
1785                 strncpy(p1, str, SETUP_BUFFER_SIZE - strlen(setup_buffer));
1786         setup_buffer[SETUP_BUFFER_SIZE - 1] = '\0';
1787         p1 = setup_buffer;
1788         i = 0;
1789         while (*p1 && (i < MAX_SETUP_ARGS)) {
1790                 p2 = strchr(p1, ',');
1791                 if (p2) {
1792                         *p2 = '\0';
1793                         if (p1 != p2)
1794                                 setup_args[i] = p1;
1795                         p1 = p2 + 1;
1796                         i++;
1797                 } else {
1798                         setup_args[i] = p1;
1799                         break;
1800                 }
1801         }
1802         for (i = 0; i < MAX_SETUP_ARGS; i++)
1803                 setup_used[i] = 0;
1804         done_setup = 1;
1805
1806         return 1;
1807 }
1808 __setup("wd33c93=", wd33c93_setup);
1809
1810 /* check_setup_args() returns index if key found, 0 if not
1811  */
1812 static int
1813 check_setup_args(char *key, int *flags, int *val, char *buf)
1814 {
1815         int x;
1816         char *cp;
1817
1818         for (x = 0; x < MAX_SETUP_ARGS; x++) {
1819                 if (setup_used[x])
1820                         continue;
1821                 if (!strncmp(setup_args[x], key, strlen(key)))
1822                         break;
1823                 if (!strncmp(setup_args[x], "next", strlen("next")))
1824                         return 0;
1825         }
1826         if (x == MAX_SETUP_ARGS)
1827                 return 0;
1828         setup_used[x] = 1;
1829         cp = setup_args[x] + strlen(key);
1830         *val = -1;
1831         if (*cp != ':')
1832                 return ++x;
1833         cp++;
1834         if ((*cp >= '0') && (*cp <= '9')) {
1835                 *val = simple_strtoul(cp, NULL, 0);
1836         }
1837         return ++x;
1838 }
1839
1840 /*
1841  * Calculate internal data-transfer-clock cycle from input-clock
1842  * frequency (/MHz) and fill 'sx_table'.
1843  *
1844  * The original driver used to rely on a fixed sx_table, containing periods
1845  * for (only) the lower limits of the respective input-clock-frequency ranges
1846  * (8-10/12-15/16-20 MHz). Although it seems, that no problems ocurred with
1847  * this setting so far, it might be desirable to adjust the transfer periods
1848  * closer to the really attached, possibly 25% higher, input-clock, since
1849  * - the wd33c93 may really use a significant shorter period, than it has
1850  *   negotiated (eg. thrashing the target, which expects 4/8MHz, with 5/10MHz
1851  *   instead).
1852  * - the wd33c93 may ask the target for a lower transfer rate, than the target
1853  *   is capable of (eg. negotiating for an assumed minimum of 252ns instead of
1854  *   possible 200ns, which indeed shows up in tests as an approx. 10% lower
1855  *   transfer rate).
1856  */
1857 static inline unsigned int
1858 round_4(unsigned int x)
1859 {
1860         switch (x & 3) {
1861                 case 1: --x;
1862                         break;
1863                 case 2: ++x;
1864                 case 3: ++x;
1865         }
1866         return x;
1867 }
1868
1869 static void
1870 calc_sx_table(unsigned int mhz, struct sx_period sx_table[9])
1871 {
1872         unsigned int d, i;
1873         if (mhz < 11)
1874                 d = 2;  /* divisor for  8-10 MHz input-clock */
1875         else if (mhz < 16)
1876                 d = 3;  /* divisor for 12-15 MHz input-clock */
1877         else
1878                 d = 4;  /* divisor for 16-20 MHz input-clock */
1879
1880         d = (100000 * d) / 2 / mhz; /* 100 x DTCC / nanosec */
1881
1882         sx_table[0].period_ns = 1;
1883         sx_table[0].reg_value = 0x20;
1884         for (i = 1; i < 8; i++) {
1885                 sx_table[i].period_ns = round_4((i+1)*d / 100);
1886                 sx_table[i].reg_value = (i+1)*0x10;
1887         }
1888         sx_table[7].reg_value = 0;
1889         sx_table[8].period_ns = 0;
1890         sx_table[8].reg_value = 0;
1891 }
1892
1893 /*
1894  * check and, maybe, map an init- or "clock:"- argument.
1895  */
1896 static uchar
1897 set_clk_freq(int freq, int *mhz)
1898 {
1899         int x = freq;
1900         if (WD33C93_FS_8_10 == freq)
1901                 freq = 8;
1902         else if (WD33C93_FS_12_15 == freq)
1903                 freq = 12;
1904         else if (WD33C93_FS_16_20 == freq)
1905                 freq = 16;
1906         else if (freq > 7 && freq < 11)
1907                 x = WD33C93_FS_8_10;
1908                 else if (freq > 11 && freq < 16)
1909                 x = WD33C93_FS_12_15;
1910                 else if (freq > 15 && freq < 21)
1911                 x = WD33C93_FS_16_20;
1912         else {
1913                         /* Hmm, wouldn't it be safer to assume highest freq here? */
1914                 x = WD33C93_FS_8_10;
1915                 freq = 8;
1916         }
1917         *mhz = freq;
1918         return x;
1919 }
1920
1921 /*
1922  * to be used with the resync: fast: ... options
1923  */
1924 static inline void set_resync ( struct WD33C93_hostdata *hd, int mask )
1925 {
1926         int i;
1927         for (i = 0; i < 8; i++)
1928                 if (mask & (1 << i))
1929                         hd->sync_stat[i] = SS_UNSET;
1930 }
1931
1932 void
1933 wd33c93_init(struct Scsi_Host *instance, const wd33c93_regs regs,
1934              dma_setup_t setup, dma_stop_t stop, int clock_freq)
1935 {
1936         struct WD33C93_hostdata *hostdata;
1937         int i;
1938         int flags;
1939         int val;
1940         char buf[32];
1941
1942         if (!done_setup && setup_strings)
1943                 wd33c93_setup(setup_strings);
1944
1945         hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1946
1947         hostdata->regs = regs;
1948         hostdata->clock_freq = set_clk_freq(clock_freq, &i);
1949         calc_sx_table(i, hostdata->sx_table);
1950         hostdata->dma_setup = setup;
1951         hostdata->dma_stop = stop;
1952         hostdata->dma_bounce_buffer = NULL;
1953         hostdata->dma_bounce_len = 0;
1954         for (i = 0; i < 8; i++) {
1955                 hostdata->busy[i] = 0;
1956                 hostdata->sync_xfer[i] =
1957                         calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF,
1958                                         0, hostdata->sx_table);
1959                 hostdata->sync_stat[i] = SS_UNSET;      /* using default sync values */
1960 #ifdef PROC_STATISTICS
1961                 hostdata->cmd_cnt[i] = 0;
1962                 hostdata->disc_allowed_cnt[i] = 0;
1963                 hostdata->disc_done_cnt[i] = 0;
1964 #endif
1965         }
1966         hostdata->input_Q = NULL;
1967         hostdata->selecting = NULL;
1968         hostdata->connected = NULL;
1969         hostdata->disconnected_Q = NULL;
1970         hostdata->state = S_UNCONNECTED;
1971         hostdata->dma = D_DMA_OFF;
1972         hostdata->level2 = L2_BASIC;
1973         hostdata->disconnect = DIS_ADAPTIVE;
1974         hostdata->args = DEBUG_DEFAULTS;
1975         hostdata->incoming_ptr = 0;
1976         hostdata->outgoing_len = 0;
1977         hostdata->default_sx_per = DEFAULT_SX_PER;
1978         hostdata->no_dma = 0;   /* default is DMA enabled */
1979
1980 #ifdef PROC_INTERFACE
1981         hostdata->proc = PR_VERSION | PR_INFO | PR_STATISTICS |
1982             PR_CONNECTED | PR_INPUTQ | PR_DISCQ | PR_STOP;
1983 #ifdef PROC_STATISTICS
1984         hostdata->dma_cnt = 0;
1985         hostdata->pio_cnt = 0;
1986         hostdata->int_cnt = 0;
1987 #endif
1988 #endif
1989
1990         if (check_setup_args("clock", &flags, &val, buf)) {
1991                 hostdata->clock_freq = set_clk_freq(val, &val);
1992                 calc_sx_table(val, hostdata->sx_table);
1993         }
1994
1995         if (check_setup_args("nosync", &flags, &val, buf))
1996                 hostdata->no_sync = val;
1997
1998         if (check_setup_args("nodma", &flags, &val, buf))
1999                 hostdata->no_dma = (val == -1) ? 1 : val;
2000
2001         if (check_setup_args("period", &flags, &val, buf))
2002                 hostdata->default_sx_per =
2003                     hostdata->sx_table[round_period((unsigned int) val,
2004                                                     hostdata->sx_table)].period_ns;
2005
2006         if (check_setup_args("disconnect", &flags, &val, buf)) {
2007                 if ((val >= DIS_NEVER) && (val <= DIS_ALWAYS))
2008                         hostdata->disconnect = val;
2009                 else
2010                         hostdata->disconnect = DIS_ADAPTIVE;
2011         }
2012
2013         if (check_setup_args("level2", &flags, &val, buf))
2014                 hostdata->level2 = val;
2015
2016         if (check_setup_args("debug", &flags, &val, buf))
2017                 hostdata->args = val & DB_MASK;
2018
2019         if (check_setup_args("burst", &flags, &val, buf))
2020                 hostdata->dma_mode = val ? CTRL_BURST:CTRL_DMA;
2021
2022         if (WD33C93_FS_16_20 == hostdata->clock_freq /* divisor 4 */
2023                 && check_setup_args("fast", &flags, &val, buf))
2024                 hostdata->fast = !!val;
2025
2026         if ((i = check_setup_args("next", &flags, &val, buf))) {
2027                 while (i)
2028                         setup_used[--i] = 1;
2029         }
2030 #ifdef PROC_INTERFACE
2031         if (check_setup_args("proc", &flags, &val, buf))
2032                 hostdata->proc = val;
2033 #endif
2034
2035         spin_lock_irq(&hostdata->lock);
2036         reset_wd33c93(instance);
2037         spin_unlock_irq(&hostdata->lock);
2038
2039         printk("wd33c93-%d: chip=%s/%d no_sync=0x%x no_dma=%d",
2040                instance->host_no,
2041                (hostdata->chip == C_WD33C93) ? "WD33c93" : (hostdata->chip ==
2042                                                             C_WD33C93A) ?
2043                "WD33c93A" : (hostdata->chip ==
2044                              C_WD33C93B) ? "WD33c93B" : "unknown",
2045                hostdata->microcode, hostdata->no_sync, hostdata->no_dma);
2046 #ifdef DEBUGGING_ON
2047         printk(" debug_flags=0x%02x\n", hostdata->args);
2048 #else
2049         printk(" debugging=OFF\n");
2050 #endif
2051         printk("           setup_args=");
2052         for (i = 0; i < MAX_SETUP_ARGS; i++)
2053                 printk("%s,", setup_args[i]);
2054         printk("\n");
2055         printk("           Version %s - %s, Compiled %s at %s\n",
2056                WD33C93_VERSION, WD33C93_DATE, __DATE__, __TIME__);
2057 }
2058
2059 int
2060 wd33c93_proc_info(struct Scsi_Host *instance, char *buf, char **start, off_t off, int len, int in)
2061 {
2062
2063 #ifdef PROC_INTERFACE
2064
2065         char *bp;
2066         char tbuf[128];
2067         struct WD33C93_hostdata *hd;
2068         struct scsi_cmnd *cmd;
2069         int x;
2070         static int stop = 0;
2071
2072         hd = (struct WD33C93_hostdata *) instance->hostdata;
2073
2074 /* If 'in' is TRUE we need to _read_ the proc file. We accept the following
2075  * keywords (same format as command-line, but arguments are not optional):
2076  *    debug
2077  *    disconnect
2078  *    period
2079  *    resync
2080  *    proc
2081  *    nodma
2082  *    level2
2083  *    burst
2084  *    fast
2085  *    nosync
2086  */
2087
2088         if (in) {
2089                 buf[len] = '\0';
2090                 for (bp = buf; *bp; ) {
2091                         while (',' == *bp || ' ' == *bp)
2092                                 ++bp;
2093                 if (!strncmp(bp, "debug:", 6)) {
2094                                 hd->args = simple_strtoul(bp+6, &bp, 0) & DB_MASK;
2095                 } else if (!strncmp(bp, "disconnect:", 11)) {
2096                                 x = simple_strtoul(bp+11, &bp, 0);
2097                         if (x < DIS_NEVER || x > DIS_ALWAYS)
2098                                 x = DIS_ADAPTIVE;
2099                         hd->disconnect = x;
2100                 } else if (!strncmp(bp, "period:", 7)) {
2101                         x = simple_strtoul(bp+7, &bp, 0);
2102                         hd->default_sx_per =
2103                                 hd->sx_table[round_period((unsigned int) x,
2104                                                           hd->sx_table)].period_ns;
2105                 } else if (!strncmp(bp, "resync:", 7)) {
2106                                 set_resync(hd, (int)simple_strtoul(bp+7, &bp, 0));
2107                 } else if (!strncmp(bp, "proc:", 5)) {
2108                                 hd->proc = simple_strtoul(bp+5, &bp, 0);
2109                 } else if (!strncmp(bp, "nodma:", 6)) {
2110                                 hd->no_dma = simple_strtoul(bp+6, &bp, 0);
2111                 } else if (!strncmp(bp, "level2:", 7)) {
2112                                 hd->level2 = simple_strtoul(bp+7, &bp, 0);
2113                         } else if (!strncmp(bp, "burst:", 6)) {
2114                                 hd->dma_mode =
2115                                         simple_strtol(bp+6, &bp, 0) ? CTRL_BURST:CTRL_DMA;
2116                         } else if (!strncmp(bp, "fast:", 5)) {
2117                                 x = !!simple_strtol(bp+5, &bp, 0);
2118                                 if (x != hd->fast)
2119                                         set_resync(hd, 0xff);
2120                                 hd->fast = x;
2121                         } else if (!strncmp(bp, "nosync:", 7)) {
2122                                 x = simple_strtoul(bp+7, &bp, 0);
2123                                 set_resync(hd, x ^ hd->no_sync);
2124                                 hd->no_sync = x;
2125                         } else {
2126                                 break; /* unknown keyword,syntax-error,... */
2127                         }
2128                 }
2129                 return len;
2130         }
2131
2132         spin_lock_irq(&hd->lock);
2133         bp = buf;
2134         *bp = '\0';
2135         if (hd->proc & PR_VERSION) {
2136                 sprintf(tbuf, "\nVersion %s - %s. Compiled %s %s",
2137                         WD33C93_VERSION, WD33C93_DATE, __DATE__, __TIME__);
2138                 strcat(bp, tbuf);
2139         }
2140         if (hd->proc & PR_INFO) {
2141                 sprintf(tbuf, "\nclock_freq=%02x no_sync=%02x no_dma=%d"
2142                         " dma_mode=%02x fast=%d",
2143                         hd->clock_freq, hd->no_sync, hd->no_dma, hd->dma_mode, hd->fast);
2144                 strcat(bp, tbuf);
2145                 strcat(bp, "\nsync_xfer[] =       ");
2146                 for (x = 0; x < 7; x++) {
2147                         sprintf(tbuf, "\t%02x", hd->sync_xfer[x]);
2148                         strcat(bp, tbuf);
2149                 }
2150                 strcat(bp, "\nsync_stat[] =       ");
2151                 for (x = 0; x < 7; x++) {
2152                         sprintf(tbuf, "\t%02x", hd->sync_stat[x]);
2153                         strcat(bp, tbuf);
2154                 }
2155         }
2156 #ifdef PROC_STATISTICS
2157         if (hd->proc & PR_STATISTICS) {
2158                 strcat(bp, "\ncommands issued:    ");
2159                 for (x = 0; x < 7; x++) {
2160                         sprintf(tbuf, "\t%ld", hd->cmd_cnt[x]);
2161                         strcat(bp, tbuf);
2162                 }
2163                 strcat(bp, "\ndisconnects allowed:");
2164                 for (x = 0; x < 7; x++) {
2165                         sprintf(tbuf, "\t%ld", hd->disc_allowed_cnt[x]);
2166                         strcat(bp, tbuf);
2167                 }
2168                 strcat(bp, "\ndisconnects done:   ");
2169                 for (x = 0; x < 7; x++) {
2170                         sprintf(tbuf, "\t%ld", hd->disc_done_cnt[x]);
2171                         strcat(bp, tbuf);
2172                 }
2173                 sprintf(tbuf,
2174                         "\ninterrupts: %ld, DATA_PHASE ints: %ld DMA, %ld PIO",
2175                         hd->int_cnt, hd->dma_cnt, hd->pio_cnt);
2176                 strcat(bp, tbuf);
2177         }
2178 #endif
2179         if (hd->proc & PR_CONNECTED) {
2180                 strcat(bp, "\nconnected:     ");
2181                 if (hd->connected) {
2182                         cmd = (struct scsi_cmnd *) hd->connected;
2183                         sprintf(tbuf, " %ld-%d:%d(%02x)",
2184                                 cmd->serial_number, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2185                         strcat(bp, tbuf);
2186                 }
2187         }
2188         if (hd->proc & PR_INPUTQ) {
2189                 strcat(bp, "\ninput_Q:       ");
2190                 cmd = (struct scsi_cmnd *) hd->input_Q;
2191                 while (cmd) {
2192                         sprintf(tbuf, " %ld-%d:%d(%02x)",
2193                                 cmd->serial_number, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2194                         strcat(bp, tbuf);
2195                         cmd = (struct scsi_cmnd *) cmd->host_scribble;
2196                 }
2197         }
2198         if (hd->proc & PR_DISCQ) {
2199                 strcat(bp, "\ndisconnected_Q:");
2200                 cmd = (struct scsi_cmnd *) hd->disconnected_Q;
2201                 while (cmd) {
2202                         sprintf(tbuf, " %ld-%d:%d(%02x)",
2203                                 cmd->serial_number, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2204                         strcat(bp, tbuf);
2205                         cmd = (struct scsi_cmnd *) cmd->host_scribble;
2206                 }
2207         }
2208         strcat(bp, "\n");
2209         spin_unlock_irq(&hd->lock);
2210         *start = buf;
2211         if (stop) {
2212                 stop = 0;
2213                 return 0;
2214         }
2215         if (off > 0x40000)      /* ALWAYS stop after 256k bytes have been read */
2216                 stop = 1;
2217         if (hd->proc & PR_STOP) /* stop every other time */
2218                 stop = 1;
2219         return strlen(bp);
2220
2221 #else                           /* PROC_INTERFACE */
2222
2223         return 0;
2224
2225 #endif                          /* PROC_INTERFACE */
2226
2227 }
2228
2229 EXPORT_SYMBOL(wd33c93_host_reset);
2230 EXPORT_SYMBOL(wd33c93_init);
2231 EXPORT_SYMBOL(wd33c93_abort);
2232 EXPORT_SYMBOL(wd33c93_queuecommand);
2233 EXPORT_SYMBOL(wd33c93_intr);
2234 EXPORT_SYMBOL(wd33c93_proc_info);