GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / scsi / wd33c93.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (c) 1996 John Shifflett, GeoLog Consulting
4  *    john@geolog.com
5  *    jshiffle@netcom.com
6  */
7
8 /*
9  * Drew Eckhardt's excellent 'Generic NCR5380' sources from Linux-PC
10  * provided much of the inspiration and some of the code for this
11  * driver. Everything I know about Amiga DMA was gleaned from careful
12  * reading of Hamish Mcdonald's original wd33c93 driver; in fact, I
13  * borrowed shamelessly from all over that source. Thanks Hamish!
14  *
15  * _This_ driver is (I feel) an improvement over the old one in
16  * several respects:
17  *
18  *    -  Target Disconnection/Reconnection  is now supported. Any
19  *          system with more than one device active on the SCSI bus
20  *          will benefit from this. The driver defaults to what I
21  *          call 'adaptive disconnect' - meaning that each command
22  *          is evaluated individually as to whether or not it should
23  *          be run with the option to disconnect/reselect (if the
24  *          device chooses), or as a "SCSI-bus-hog".
25  *
26  *    -  Synchronous data transfers are now supported. Because of
27  *          a few devices that choke after telling the driver that
28  *          they can do sync transfers, we don't automatically use
29  *          this faster protocol - it can be enabled via the command-
30  *          line on a device-by-device basis.
31  *
32  *    -  Runtime operating parameters can now be specified through
33  *       the 'amiboot' or the 'insmod' command line. For amiboot do:
34  *          "amiboot [usual stuff] wd33c93=blah,blah,blah"
35  *       The defaults should be good for most people. See the comment
36  *       for 'setup_strings' below for more details.
37  *
38  *    -  The old driver relied exclusively on what the Western Digital
39  *          docs call "Combination Level 2 Commands", which are a great
40  *          idea in that the CPU is relieved of a lot of interrupt
41  *          overhead. However, by accepting a certain (user-settable)
42  *          amount of additional interrupts, this driver achieves
43  *          better control over the SCSI bus, and data transfers are
44  *          almost as fast while being much easier to define, track,
45  *          and debug.
46  *
47  *
48  * TODO:
49  *       more speed. linked commands.
50  *
51  *
52  * People with bug reports, wish-lists, complaints, comments,
53  * or improvements are asked to pah-leeez email me (John Shifflett)
54  * at john@geolog.com or jshiffle@netcom.com! I'm anxious to get
55  * this thing into as good a shape as possible, and I'm positive
56  * there are lots of lurking bugs and "Stupid Places".
57  *
58  * Updates:
59  *
60  * Added support for pre -A chips, which don't have advanced features
61  * and will generate CSR_RESEL rather than CSR_RESEL_AM.
62  *      Richard Hirst <richard@sleepie.demon.co.uk>  August 2000
63  *
64  * Added support for Burst Mode DMA and Fast SCSI. Enabled the use of
65  * default_sx_per for asynchronous data transfers. Added adjustment
66  * of transfer periods in sx_table to the actual input-clock.
67  *  peter fuerst <post@pfrst.de>  February 2007
68  */
69
70 #include <linux/module.h>
71
72 #include <linux/string.h>
73 #include <linux/delay.h>
74 #include <linux/init.h>
75 #include <linux/interrupt.h>
76 #include <linux/blkdev.h>
77
78 #include <scsi/scsi.h>
79 #include <scsi/scsi_cmnd.h>
80 #include <scsi/scsi_device.h>
81 #include <scsi/scsi_host.h>
82
83 #include <asm/irq.h>
84
85 #include "wd33c93.h"
86
87 #define optimum_sx_per(hostdata) (hostdata)->sx_table[1].period_ns
88
89
90 #define WD33C93_VERSION    "1.26++"
91 #define WD33C93_DATE       "10/Feb/2007"
92
93 MODULE_AUTHOR("John Shifflett");
94 MODULE_DESCRIPTION("Generic WD33C93 SCSI driver");
95 MODULE_LICENSE("GPL");
96
97 /*
98  * 'setup_strings' is a single string used to pass operating parameters and
99  * settings from the kernel/module command-line to the driver. 'setup_args[]'
100  * is an array of strings that define the compile-time default values for
101  * these settings. If Linux boots with an amiboot or insmod command-line,
102  * those settings are combined with 'setup_args[]'. Note that amiboot
103  * command-lines are prefixed with "wd33c93=" while insmod uses a
104  * "setup_strings=" prefix. The driver recognizes the following keywords
105  * (lower case required) and arguments:
106  *
107  * -  nosync:bitmask -bitmask is a byte where the 1st 7 bits correspond with
108  *                    the 7 possible SCSI devices. Set a bit to negotiate for
109  *                    asynchronous transfers on that device. To maintain
110  *                    backwards compatibility, a command-line such as
111  *                    "wd33c93=255" will be automatically translated to
112  *                    "wd33c93=nosync:0xff".
113  * -  nodma:x        -x = 1 to disable DMA, x = 0 to enable it. Argument is
114  *                    optional - if not present, same as "nodma:1".
115  * -  period:ns      -ns is the minimum # of nanoseconds in a SCSI data transfer
116  *                    period. Default is 500; acceptable values are 250 - 1000.
117  * -  disconnect:x   -x = 0 to never allow disconnects, 2 to always allow them.
118  *                    x = 1 does 'adaptive' disconnects, which is the default
119  *                    and generally the best choice.
120  * -  debug:x        -If 'DEBUGGING_ON' is defined, x is a bit mask that causes
121  *                    various types of debug output to printed - see the DB_xxx
122  *                    defines in wd33c93.h
123  * -  clock:x        -x = clock input in MHz for WD33c93 chip. Normal values
124  *                    would be from 8 through 20. Default is 8.
125  * -  burst:x        -x = 1 to use Burst Mode (or Demand-Mode) DMA, x = 0 to use
126  *                    Single Byte DMA, which is the default. Argument is
127  *                    optional - if not present, same as "burst:1".
128  * -  fast:x         -x = 1 to enable Fast SCSI, which is only effective with
129  *                    input-clock divisor 4 (WD33C93_FS_16_20), x = 0 to disable
130  *                    it, which is the default.  Argument is optional - if not
131  *                    present, same as "fast:1".
132  * -  next           -No argument. Used to separate blocks of keywords when
133  *                    there's more than one host adapter in the system.
134  *
135  * Syntax Notes:
136  * -  Numeric arguments can be decimal or the '0x' form of hex notation. There
137  *    _must_ be a colon between a keyword and its numeric argument, with no
138  *    spaces.
139  * -  Keywords are separated by commas, no spaces, in the standard kernel
140  *    command-line manner.
141  * -  A keyword in the 'nth' comma-separated command-line member will overwrite
142  *    the 'nth' element of setup_args[]. A blank command-line member (in
143  *    other words, a comma with no preceding keyword) will _not_ overwrite
144  *    the corresponding setup_args[] element.
145  * -  If a keyword is used more than once, the first one applies to the first
146  *    SCSI host found, the second to the second card, etc, unless the 'next'
147  *    keyword is used to change the order.
148  *
149  * Some amiboot examples (for insmod, use 'setup_strings' instead of 'wd33c93'):
150  * -  wd33c93=nosync:255
151  * -  wd33c93=nodma
152  * -  wd33c93=nodma:1
153  * -  wd33c93=disconnect:2,nosync:0x08,period:250
154  * -  wd33c93=debug:0x1c
155  */
156
157 /* Normally, no defaults are specified */
158 static char *setup_args[] = { "", "", "", "", "", "", "", "", "", "" };
159
160 static char *setup_strings;
161 module_param(setup_strings, charp, 0);
162
163 static void wd33c93_execute(struct Scsi_Host *instance);
164
165 #ifdef CONFIG_WD33C93_PIO
166 static inline uchar
167 read_wd33c93(const wd33c93_regs regs, uchar reg_num)
168 {
169         uchar data;
170
171         outb(reg_num, regs.SASR);
172         data = inb(regs.SCMD);
173         return data;
174 }
175
176 static inline unsigned long
177 read_wd33c93_count(const wd33c93_regs regs)
178 {
179         unsigned long value;
180
181         outb(WD_TRANSFER_COUNT_MSB, regs.SASR);
182         value = inb(regs.SCMD) << 16;
183         value |= inb(regs.SCMD) << 8;
184         value |= inb(regs.SCMD);
185         return value;
186 }
187
188 static inline uchar
189 read_aux_stat(const wd33c93_regs regs)
190 {
191         return inb(regs.SASR);
192 }
193
194 static inline void
195 write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value)
196 {
197       outb(reg_num, regs.SASR);
198       outb(value, regs.SCMD);
199 }
200
201 static inline void
202 write_wd33c93_count(const wd33c93_regs regs, unsigned long value)
203 {
204         outb(WD_TRANSFER_COUNT_MSB, regs.SASR);
205         outb((value >> 16) & 0xff, regs.SCMD);
206         outb((value >> 8) & 0xff, regs.SCMD);
207         outb( value & 0xff, regs.SCMD);
208 }
209
210 #define write_wd33c93_cmd(regs, cmd) \
211         write_wd33c93((regs), WD_COMMAND, (cmd))
212
213 static inline void
214 write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[])
215 {
216         int i;
217
218         outb(WD_CDB_1, regs.SASR);
219         for (i=0; i<len; i++)
220                 outb(cmnd[i], regs.SCMD);
221 }
222
223 #else /* CONFIG_WD33C93_PIO */
224 static inline uchar
225 read_wd33c93(const wd33c93_regs regs, uchar reg_num)
226 {
227         *regs.SASR = reg_num;
228         mb();
229         return (*regs.SCMD);
230 }
231
232 static unsigned long
233 read_wd33c93_count(const wd33c93_regs regs)
234 {
235         unsigned long value;
236
237         *regs.SASR = WD_TRANSFER_COUNT_MSB;
238         mb();
239         value = *regs.SCMD << 16;
240         value |= *regs.SCMD << 8;
241         value |= *regs.SCMD;
242         mb();
243         return value;
244 }
245
246 static inline uchar
247 read_aux_stat(const wd33c93_regs regs)
248 {
249         return *regs.SASR;
250 }
251
252 static inline void
253 write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value)
254 {
255         *regs.SASR = reg_num;
256         mb();
257         *regs.SCMD = value;
258         mb();
259 }
260
261 static void
262 write_wd33c93_count(const wd33c93_regs regs, unsigned long value)
263 {
264         *regs.SASR = WD_TRANSFER_COUNT_MSB;
265         mb();
266         *regs.SCMD = value >> 16;
267         *regs.SCMD = value >> 8;
268         *regs.SCMD = value;
269         mb();
270 }
271
272 static inline void
273 write_wd33c93_cmd(const wd33c93_regs regs, uchar cmd)
274 {
275         *regs.SASR = WD_COMMAND;
276         mb();
277         *regs.SCMD = cmd;
278         mb();
279 }
280
281 static inline void
282 write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[])
283 {
284         int i;
285
286         *regs.SASR = WD_CDB_1;
287         for (i = 0; i < len; i++)
288                 *regs.SCMD = cmnd[i];
289 }
290 #endif /* CONFIG_WD33C93_PIO */
291
292 static inline uchar
293 read_1_byte(const wd33c93_regs regs)
294 {
295         uchar asr;
296         uchar x = 0;
297
298         write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
299         write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO | 0x80);
300         do {
301                 asr = read_aux_stat(regs);
302                 if (asr & ASR_DBR)
303                         x = read_wd33c93(regs, WD_DATA);
304         } while (!(asr & ASR_INT));
305         return x;
306 }
307
308 static int
309 round_period(unsigned int period, const struct sx_period *sx_table)
310 {
311         int x;
312
313         for (x = 1; sx_table[x].period_ns; x++) {
314                 if ((period <= sx_table[x - 0].period_ns) &&
315                     (period > sx_table[x - 1].period_ns)) {
316                         return x;
317                 }
318         }
319         return 7;
320 }
321
322 /*
323  * Calculate Synchronous Transfer Register value from SDTR code.
324  */
325 static uchar
326 calc_sync_xfer(unsigned int period, unsigned int offset, unsigned int fast,
327                const struct sx_period *sx_table)
328 {
329         /* When doing Fast SCSI synchronous data transfers, the corresponding
330          * value in 'sx_table' is two times the actually used transfer period.
331          */
332         uchar result;
333
334         if (offset && fast) {
335                 fast = STR_FSS;
336                 period *= 2;
337         } else {
338                 fast = 0;
339         }
340         period *= 4;            /* convert SDTR code to ns */
341         result = sx_table[round_period(period,sx_table)].reg_value;
342         result |= (offset < OPTIMUM_SX_OFF) ? offset : OPTIMUM_SX_OFF;
343         result |= fast;
344         return result;
345 }
346
347 /*
348  * Calculate SDTR code bytes [3],[4] from period and offset.
349  */
350 static inline void
351 calc_sync_msg(unsigned int period, unsigned int offset, unsigned int fast,
352                 uchar  msg[2])
353 {
354         /* 'period' is a "normal"-mode value, like the ones in 'sx_table'. The
355          * actually used transfer period for Fast SCSI synchronous data
356          * transfers is half that value.
357          */
358         period /= 4;
359         if (offset && fast)
360                 period /= 2;
361         msg[0] = period;
362         msg[1] = offset;
363 }
364
365 static int wd33c93_queuecommand_lck(struct scsi_cmnd *cmd)
366 {
367         struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd);
368         struct WD33C93_hostdata *hostdata;
369         struct scsi_cmnd *tmp;
370
371         hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata;
372
373         DB(DB_QUEUE_COMMAND,
374            printk("Q-%d-%02x( ", cmd->device->id, cmd->cmnd[0]))
375
376 /* Set up a few fields in the scsi_cmnd structure for our own use:
377  *  - host_scribble is the pointer to the next cmd in the input queue
378  *  - result is what you'd expect
379  */
380         cmd->host_scribble = NULL;
381         cmd->result = 0;
382
383 /* We use the Scsi_Pointer structure that's included with each command
384  * as a scratchpad (as it's intended to be used!). The handy thing about
385  * the SCp.xxx fields is that they're always associated with a given
386  * cmd, and are preserved across disconnect-reselect. This means we
387  * can pretty much ignore SAVE_POINTERS and RESTORE_POINTERS messages
388  * if we keep all the critical pointers and counters in SCp:
389  *  - SCp.ptr is the pointer into the RAM buffer
390  *  - SCp.this_residual is the size of that buffer
391  *  - SCp.buffer points to the current scatter-gather buffer
392  *  - SCp.buffers_residual tells us how many S.G. buffers there are
393  *  - SCp.have_data_in is not used
394  *  - SCp.sent_command is not used
395  *  - SCp.phase records this command's SRCID_ER bit setting
396  */
397
398         if (scsi_bufflen(cmd)) {
399                 scsi_pointer->buffer = scsi_sglist(cmd);
400                 scsi_pointer->buffers_residual = scsi_sg_count(cmd) - 1;
401                 scsi_pointer->ptr = sg_virt(scsi_pointer->buffer);
402                 scsi_pointer->this_residual = scsi_pointer->buffer->length;
403         } else {
404                 scsi_pointer->buffer = NULL;
405                 scsi_pointer->buffers_residual = 0;
406                 scsi_pointer->ptr = NULL;
407                 scsi_pointer->this_residual = 0;
408         }
409
410 /* WD docs state that at the conclusion of a "LEVEL2" command, the
411  * status byte can be retrieved from the LUN register. Apparently,
412  * this is the case only for *uninterrupted* LEVEL2 commands! If
413  * there are any unexpected phases entered, even if they are 100%
414  * legal (different devices may choose to do things differently),
415  * the LEVEL2 command sequence is exited. This often occurs prior
416  * to receiving the status byte, in which case the driver does a
417  * status phase interrupt and gets the status byte on its own.
418  * While such a command can then be "resumed" (ie restarted to
419  * finish up as a LEVEL2 command), the LUN register will NOT be
420  * a valid status byte at the command's conclusion, and we must
421  * use the byte obtained during the earlier interrupt. Here, we
422  * preset SCp.Status to an illegal value (0xff) so that when
423  * this command finally completes, we can tell where the actual
424  * status byte is stored.
425  */
426
427         scsi_pointer->Status = ILLEGAL_STATUS_BYTE;
428
429         /*
430          * Add the cmd to the end of 'input_Q'. Note that REQUEST SENSE
431          * commands are added to the head of the queue so that the desired
432          * sense data is not lost before REQUEST_SENSE executes.
433          */
434
435         spin_lock_irq(&hostdata->lock);
436
437         if (!(hostdata->input_Q) || (cmd->cmnd[0] == REQUEST_SENSE)) {
438                 cmd->host_scribble = (uchar *) hostdata->input_Q;
439                 hostdata->input_Q = cmd;
440         } else {                /* find the end of the queue */
441                 for (tmp = (struct scsi_cmnd *) hostdata->input_Q;
442                      tmp->host_scribble;
443                      tmp = (struct scsi_cmnd *) tmp->host_scribble) ;
444                 tmp->host_scribble = (uchar *) cmd;
445         }
446
447 /* We know that there's at least one command in 'input_Q' now.
448  * Go see if any of them are runnable!
449  */
450
451         wd33c93_execute(cmd->device->host);
452
453         DB(DB_QUEUE_COMMAND, printk(")Q "))
454
455         spin_unlock_irq(&hostdata->lock);
456         return 0;
457 }
458
459 DEF_SCSI_QCMD(wd33c93_queuecommand)
460
461 /*
462  * This routine attempts to start a scsi command. If the host_card is
463  * already connected, we give up immediately. Otherwise, look through
464  * the input_Q, using the first command we find that's intended
465  * for a currently non-busy target/lun.
466  *
467  * wd33c93_execute() is always called with interrupts disabled or from
468  * the wd33c93_intr itself, which means that a wd33c93 interrupt
469  * cannot occur while we are in here.
470  */
471 static void
472 wd33c93_execute(struct Scsi_Host *instance)
473 {
474         struct scsi_pointer *scsi_pointer;
475         struct WD33C93_hostdata *hostdata =
476             (struct WD33C93_hostdata *) instance->hostdata;
477         const wd33c93_regs regs = hostdata->regs;
478         struct scsi_cmnd *cmd, *prev;
479
480         DB(DB_EXECUTE, printk("EX("))
481         if (hostdata->selecting || hostdata->connected) {
482                 DB(DB_EXECUTE, printk(")EX-0 "))
483                 return;
484         }
485
486         /*
487          * Search through the input_Q for a command destined
488          * for an idle target/lun.
489          */
490
491         cmd = (struct scsi_cmnd *) hostdata->input_Q;
492         prev = NULL;
493         while (cmd) {
494                 if (!(hostdata->busy[cmd->device->id] &
495                       (1 << (cmd->device->lun & 0xff))))
496                         break;
497                 prev = cmd;
498                 cmd = (struct scsi_cmnd *) cmd->host_scribble;
499         }
500
501         /* quit if queue empty or all possible targets are busy */
502
503         if (!cmd) {
504                 DB(DB_EXECUTE, printk(")EX-1 "))
505                 return;
506         }
507
508         /*  remove command from queue */
509
510         if (prev)
511                 prev->host_scribble = cmd->host_scribble;
512         else
513                 hostdata->input_Q = (struct scsi_cmnd *) cmd->host_scribble;
514
515 #ifdef PROC_STATISTICS
516         hostdata->cmd_cnt[cmd->device->id]++;
517 #endif
518
519         /*
520          * Start the selection process
521          */
522
523         if (cmd->sc_data_direction == DMA_TO_DEVICE)
524                 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);
525         else
526                 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id | DSTID_DPD);
527
528 /* Now we need to figure out whether or not this command is a good
529  * candidate for disconnect/reselect. We guess to the best of our
530  * ability, based on a set of hierarchical rules. When several
531  * devices are operating simultaneously, disconnects are usually
532  * an advantage. In a single device system, or if only 1 device
533  * is being accessed, transfers usually go faster if disconnects
534  * are not allowed:
535  *
536  * + Commands should NEVER disconnect if hostdata->disconnect =
537  *   DIS_NEVER (this holds for tape drives also), and ALWAYS
538  *   disconnect if hostdata->disconnect = DIS_ALWAYS.
539  * + Tape drive commands should always be allowed to disconnect.
540  * + Disconnect should be allowed if disconnected_Q isn't empty.
541  * + Commands should NOT disconnect if input_Q is empty.
542  * + Disconnect should be allowed if there are commands in input_Q
543  *   for a different target/lun. In this case, the other commands
544  *   should be made disconnect-able, if not already.
545  *
546  * I know, I know - this code would flunk me out of any
547  * "C Programming 101" class ever offered. But it's easy
548  * to change around and experiment with for now.
549  */
550
551         scsi_pointer = WD33C93_scsi_pointer(cmd);
552         scsi_pointer->phase = 0;        /* assume no disconnect */
553         if (hostdata->disconnect == DIS_NEVER)
554                 goto no;
555         if (hostdata->disconnect == DIS_ALWAYS)
556                 goto yes;
557         if (cmd->device->type == 1)     /* tape drive? */
558                 goto yes;
559         if (hostdata->disconnected_Q)   /* other commands disconnected? */
560                 goto yes;
561         if (!(hostdata->input_Q))       /* input_Q empty? */
562                 goto no;
563         for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;
564              prev = (struct scsi_cmnd *) prev->host_scribble) {
565                 if ((prev->device->id != cmd->device->id) ||
566                     (prev->device->lun != cmd->device->lun)) {
567                         for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;
568                              prev = (struct scsi_cmnd *) prev->host_scribble)
569                                 WD33C93_scsi_pointer(prev)->phase = 1;
570                         goto yes;
571                 }
572         }
573
574         goto no;
575
576  yes:
577         scsi_pointer->phase = 1;
578
579 #ifdef PROC_STATISTICS
580         hostdata->disc_allowed_cnt[cmd->device->id]++;
581 #endif
582
583  no:
584
585         write_wd33c93(regs, WD_SOURCE_ID, scsi_pointer->phase ? SRCID_ER : 0);
586
587         write_wd33c93(regs, WD_TARGET_LUN, (u8)cmd->device->lun);
588         write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
589                       hostdata->sync_xfer[cmd->device->id]);
590         hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF));
591
592         if ((hostdata->level2 == L2_NONE) ||
593             (hostdata->sync_stat[cmd->device->id] == SS_UNSET)) {
594
595                 /*
596                  * Do a 'Select-With-ATN' command. This will end with
597                  * one of the following interrupts:
598                  *    CSR_RESEL_AM:  failure - can try again later.
599                  *    CSR_TIMEOUT:   failure - give up.
600                  *    CSR_SELECT:    success - proceed.
601                  */
602
603                 hostdata->selecting = cmd;
604
605 /* Every target has its own synchronous transfer setting, kept in the
606  * sync_xfer array, and a corresponding status byte in sync_stat[].
607  * Each target's sync_stat[] entry is initialized to SX_UNSET, and its
608  * sync_xfer[] entry is initialized to the default/safe value. SS_UNSET
609  * means that the parameters are undetermined as yet, and that we
610  * need to send an SDTR message to this device after selection is
611  * complete: We set SS_FIRST to tell the interrupt routine to do so.
612  * If we've been asked not to try synchronous transfers on this
613  * target (and _all_ luns within it), we'll still send the SDTR message
614  * later, but at that time we'll negotiate for async by specifying a
615  * sync fifo depth of 0.
616  */
617                 if (hostdata->sync_stat[cmd->device->id] == SS_UNSET)
618                         hostdata->sync_stat[cmd->device->id] = SS_FIRST;
619                 hostdata->state = S_SELECTING;
620                 write_wd33c93_count(regs, 0);   /* guarantee a DATA_PHASE interrupt */
621                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN);
622         } else {
623
624                 /*
625                  * Do a 'Select-With-ATN-Xfer' command. This will end with
626                  * one of the following interrupts:
627                  *    CSR_RESEL_AM:  failure - can try again later.
628                  *    CSR_TIMEOUT:   failure - give up.
629                  *    anything else: success - proceed.
630                  */
631
632                 hostdata->connected = cmd;
633                 write_wd33c93(regs, WD_COMMAND_PHASE, 0);
634
635                 /* copy command_descriptor_block into WD chip
636                  * (take advantage of auto-incrementing)
637                  */
638
639                 write_wd33c93_cdb(regs, cmd->cmd_len, cmd->cmnd);
640
641                 /* The wd33c93 only knows about Group 0, 1, and 5 commands when
642                  * it's doing a 'select-and-transfer'. To be safe, we write the
643                  * size of the CDB into the OWN_ID register for every case. This
644                  * way there won't be problems with vendor-unique, audio, etc.
645                  */
646
647                 write_wd33c93(regs, WD_OWN_ID, cmd->cmd_len);
648
649                 /* When doing a non-disconnect command with DMA, we can save
650                  * ourselves a DATA phase interrupt later by setting everything
651                  * up ahead of time.
652                  */
653
654                 if (scsi_pointer->phase == 0 && hostdata->no_dma == 0) {
655                         if (hostdata->dma_setup(cmd,
656                             (cmd->sc_data_direction == DMA_TO_DEVICE) ?
657                              DATA_OUT_DIR : DATA_IN_DIR))
658                                 write_wd33c93_count(regs, 0);   /* guarantee a DATA_PHASE interrupt */
659                         else {
660                                 write_wd33c93_count(regs,
661                                                 scsi_pointer->this_residual);
662                                 write_wd33c93(regs, WD_CONTROL,
663                                               CTRL_IDI | CTRL_EDI | hostdata->dma_mode);
664                                 hostdata->dma = D_DMA_RUNNING;
665                         }
666                 } else
667                         write_wd33c93_count(regs, 0);   /* guarantee a DATA_PHASE interrupt */
668
669                 hostdata->state = S_RUNNING_LEVEL2;
670                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
671         }
672
673         /*
674          * Since the SCSI bus can handle only 1 connection at a time,
675          * we get out of here now. If the selection fails, or when
676          * the command disconnects, we'll come back to this routine
677          * to search the input_Q again...
678          */
679
680         DB(DB_EXECUTE,
681            printk("%s)EX-2 ", scsi_pointer->phase ? "d:" : ""))
682 }
683
684 static void
685 transfer_pio(const wd33c93_regs regs, uchar * buf, int cnt,
686              int data_in_dir, struct WD33C93_hostdata *hostdata)
687 {
688         uchar asr;
689
690         DB(DB_TRANSFER,
691            printk("(%p,%d,%s:", buf, cnt, data_in_dir ? "in" : "out"))
692
693         write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
694         write_wd33c93_count(regs, cnt);
695         write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
696         if (data_in_dir) {
697                 do {
698                         asr = read_aux_stat(regs);
699                         if (asr & ASR_DBR)
700                                 *buf++ = read_wd33c93(regs, WD_DATA);
701                 } while (!(asr & ASR_INT));
702         } else {
703                 do {
704                         asr = read_aux_stat(regs);
705                         if (asr & ASR_DBR)
706                                 write_wd33c93(regs, WD_DATA, *buf++);
707                 } while (!(asr & ASR_INT));
708         }
709
710         /* Note: we are returning with the interrupt UN-cleared.
711          * Since (presumably) an entire I/O operation has
712          * completed, the bus phase is probably different, and
713          * the interrupt routine will discover this when it
714          * responds to the uncleared int.
715          */
716
717 }
718
719 static void
720 transfer_bytes(const wd33c93_regs regs, struct scsi_cmnd *cmd,
721                 int data_in_dir)
722 {
723         struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd);
724         struct WD33C93_hostdata *hostdata;
725         unsigned long length;
726
727         hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata;
728
729 /* Normally, you'd expect 'this_residual' to be non-zero here.
730  * In a series of scatter-gather transfers, however, this
731  * routine will usually be called with 'this_residual' equal
732  * to 0 and 'buffers_residual' non-zero. This means that a
733  * previous transfer completed, clearing 'this_residual', and
734  * now we need to setup the next scatter-gather buffer as the
735  * source or destination for THIS transfer.
736  */
737         if (!scsi_pointer->this_residual && scsi_pointer->buffers_residual) {
738                 scsi_pointer->buffer = sg_next(scsi_pointer->buffer);
739                 --scsi_pointer->buffers_residual;
740                 scsi_pointer->this_residual = scsi_pointer->buffer->length;
741                 scsi_pointer->ptr = sg_virt(scsi_pointer->buffer);
742         }
743         if (!scsi_pointer->this_residual) /* avoid bogus setups */
744                 return;
745
746         write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
747                       hostdata->sync_xfer[cmd->device->id]);
748
749 /* 'hostdata->no_dma' is TRUE if we don't even want to try DMA.
750  * Update 'this_residual' and 'ptr' after 'transfer_pio()' returns.
751  */
752
753         if (hostdata->no_dma || hostdata->dma_setup(cmd, data_in_dir)) {
754 #ifdef PROC_STATISTICS
755                 hostdata->pio_cnt++;
756 #endif
757                 transfer_pio(regs, (uchar *) scsi_pointer->ptr,
758                              scsi_pointer->this_residual, data_in_dir,
759                              hostdata);
760                 length = scsi_pointer->this_residual;
761                 scsi_pointer->this_residual = read_wd33c93_count(regs);
762                 scsi_pointer->ptr += length - scsi_pointer->this_residual;
763         }
764
765 /* We are able to do DMA (in fact, the Amiga hardware is
766  * already going!), so start up the wd33c93 in DMA mode.
767  * We set 'hostdata->dma' = D_DMA_RUNNING so that when the
768  * transfer completes and causes an interrupt, we're
769  * reminded to tell the Amiga to shut down its end. We'll
770  * postpone the updating of 'this_residual' and 'ptr'
771  * until then.
772  */
773
774         else {
775 #ifdef PROC_STATISTICS
776                 hostdata->dma_cnt++;
777 #endif
778                 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | hostdata->dma_mode);
779                 write_wd33c93_count(regs, scsi_pointer->this_residual);
780
781                 if ((hostdata->level2 >= L2_DATA) ||
782                     (hostdata->level2 == L2_BASIC && scsi_pointer->phase == 0)) {
783                         write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
784                         write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
785                         hostdata->state = S_RUNNING_LEVEL2;
786                 } else
787                         write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
788
789                 hostdata->dma = D_DMA_RUNNING;
790         }
791 }
792
793 void
794 wd33c93_intr(struct Scsi_Host *instance)
795 {
796         struct scsi_pointer *scsi_pointer;
797         struct WD33C93_hostdata *hostdata =
798             (struct WD33C93_hostdata *) instance->hostdata;
799         const wd33c93_regs regs = hostdata->regs;
800         struct scsi_cmnd *patch, *cmd;
801         uchar asr, sr, phs, id, lun, *ucp, msg;
802         unsigned long length, flags;
803
804         asr = read_aux_stat(regs);
805         if (!(asr & ASR_INT) || (asr & ASR_BSY))
806                 return;
807
808         spin_lock_irqsave(&hostdata->lock, flags);
809
810 #ifdef PROC_STATISTICS
811         hostdata->int_cnt++;
812 #endif
813
814         cmd = (struct scsi_cmnd *) hostdata->connected; /* assume we're connected */
815         scsi_pointer = WD33C93_scsi_pointer(cmd);
816         sr = read_wd33c93(regs, WD_SCSI_STATUS);        /* clear the interrupt */
817         phs = read_wd33c93(regs, WD_COMMAND_PHASE);
818
819         DB(DB_INTR, printk("{%02x:%02x-", asr, sr))
820
821 /* After starting a DMA transfer, the next interrupt
822  * is guaranteed to be in response to completion of
823  * the transfer. Since the Amiga DMA hardware runs in
824  * in an open-ended fashion, it needs to be told when
825  * to stop; do that here if D_DMA_RUNNING is true.
826  * Also, we have to update 'this_residual' and 'ptr'
827  * based on the contents of the TRANSFER_COUNT register,
828  * in case the device decided to do an intermediate
829  * disconnect (a device may do this if it has to do a
830  * seek, or just to be nice and let other devices have
831  * some bus time during long transfers). After doing
832  * whatever is needed, we go on and service the WD3393
833  * interrupt normally.
834  */
835             if (hostdata->dma == D_DMA_RUNNING) {
836                 DB(DB_TRANSFER,
837                    printk("[%p/%d:", scsi_pointer->ptr, scsi_pointer->this_residual))
838                     hostdata->dma_stop(cmd->device->host, cmd, 1);
839                 hostdata->dma = D_DMA_OFF;
840                 length = scsi_pointer->this_residual;
841                 scsi_pointer->this_residual = read_wd33c93_count(regs);
842                 scsi_pointer->ptr += length - scsi_pointer->this_residual;
843                 DB(DB_TRANSFER,
844                    printk("%p/%d]", scsi_pointer->ptr, scsi_pointer->this_residual))
845         }
846
847 /* Respond to the specific WD3393 interrupt - there are quite a few! */
848         switch (sr) {
849         case CSR_TIMEOUT:
850                 DB(DB_INTR, printk("TIMEOUT"))
851
852                     if (hostdata->state == S_RUNNING_LEVEL2)
853                         hostdata->connected = NULL;
854                 else {
855                         cmd = (struct scsi_cmnd *) hostdata->selecting; /* get a valid cmd */
856                         hostdata->selecting = NULL;
857                 }
858
859                 cmd->result = DID_NO_CONNECT << 16;
860                 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
861                 hostdata->state = S_UNCONNECTED;
862                 scsi_done(cmd);
863
864                 /* From esp.c:
865                  * There is a window of time within the scsi_done() path
866                  * of execution where interrupts are turned back on full
867                  * blast and left that way.  During that time we could
868                  * reconnect to a disconnected command, then we'd bomb
869                  * out below.  We could also end up executing two commands
870                  * at _once_.  ...just so you know why the restore_flags()
871                  * is here...
872                  */
873
874                 spin_unlock_irqrestore(&hostdata->lock, flags);
875
876 /* We are not connected to a target - check to see if there
877  * are commands waiting to be executed.
878  */
879
880                 wd33c93_execute(instance);
881                 break;
882
883 /* Note: this interrupt should not occur in a LEVEL2 command */
884
885         case CSR_SELECT:
886                 DB(DB_INTR, printk("SELECT"))
887                     hostdata->connected = cmd =
888                     (struct scsi_cmnd *) hostdata->selecting;
889                 hostdata->selecting = NULL;
890
891                 /* construct an IDENTIFY message with correct disconnect bit */
892
893                 hostdata->outgoing_msg[0] = IDENTIFY(0, cmd->device->lun);
894                 if (scsi_pointer->phase)
895                         hostdata->outgoing_msg[0] |= 0x40;
896
897                 if (hostdata->sync_stat[cmd->device->id] == SS_FIRST) {
898
899                         hostdata->sync_stat[cmd->device->id] = SS_WAITING;
900
901 /* Tack on a 2nd message to ask about synchronous transfers. If we've
902  * been asked to do only asynchronous transfers on this device, we
903  * request a fifo depth of 0, which is equivalent to async - should
904  * solve the problems some people have had with GVP's Guru ROM.
905  */
906
907                         hostdata->outgoing_msg[1] = EXTENDED_MESSAGE;
908                         hostdata->outgoing_msg[2] = 3;
909                         hostdata->outgoing_msg[3] = EXTENDED_SDTR;
910                         if (hostdata->no_sync & (1 << cmd->device->id)) {
911                                 calc_sync_msg(hostdata->default_sx_per, 0,
912                                                 0, hostdata->outgoing_msg + 4);
913                         } else {
914                                 calc_sync_msg(optimum_sx_per(hostdata),
915                                                 OPTIMUM_SX_OFF,
916                                                 hostdata->fast,
917                                                 hostdata->outgoing_msg + 4);
918                         }
919                         hostdata->outgoing_len = 6;
920 #ifdef SYNC_DEBUG
921                         ucp = hostdata->outgoing_msg + 1;
922                         printk(" sending SDTR %02x03%02x%02x%02x ",
923                                 ucp[0], ucp[2], ucp[3], ucp[4]);
924 #endif
925                 } else
926                         hostdata->outgoing_len = 1;
927
928                 hostdata->state = S_CONNECTED;
929                 spin_unlock_irqrestore(&hostdata->lock, flags);
930                 break;
931
932         case CSR_XFER_DONE | PHS_DATA_IN:
933         case CSR_UNEXP | PHS_DATA_IN:
934         case CSR_SRV_REQ | PHS_DATA_IN:
935                 DB(DB_INTR,
936                    printk("IN-%d.%d", scsi_pointer->this_residual,
937                           scsi_pointer->buffers_residual))
938                     transfer_bytes(regs, cmd, DATA_IN_DIR);
939                 if (hostdata->state != S_RUNNING_LEVEL2)
940                         hostdata->state = S_CONNECTED;
941                 spin_unlock_irqrestore(&hostdata->lock, flags);
942                 break;
943
944         case CSR_XFER_DONE | PHS_DATA_OUT:
945         case CSR_UNEXP | PHS_DATA_OUT:
946         case CSR_SRV_REQ | PHS_DATA_OUT:
947                 DB(DB_INTR,
948                    printk("OUT-%d.%d", scsi_pointer->this_residual,
949                           scsi_pointer->buffers_residual))
950                     transfer_bytes(regs, cmd, DATA_OUT_DIR);
951                 if (hostdata->state != S_RUNNING_LEVEL2)
952                         hostdata->state = S_CONNECTED;
953                 spin_unlock_irqrestore(&hostdata->lock, flags);
954                 break;
955
956 /* Note: this interrupt should not occur in a LEVEL2 command */
957
958         case CSR_XFER_DONE | PHS_COMMAND:
959         case CSR_UNEXP | PHS_COMMAND:
960         case CSR_SRV_REQ | PHS_COMMAND:
961                 DB(DB_INTR, printk("CMND-%02x", cmd->cmnd[0]))
962                     transfer_pio(regs, cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR,
963                                  hostdata);
964                 hostdata->state = S_CONNECTED;
965                 spin_unlock_irqrestore(&hostdata->lock, flags);
966                 break;
967
968         case CSR_XFER_DONE | PHS_STATUS:
969         case CSR_UNEXP | PHS_STATUS:
970         case CSR_SRV_REQ | PHS_STATUS:
971                 DB(DB_INTR, printk("STATUS="))
972                 scsi_pointer->Status = read_1_byte(regs);
973                 DB(DB_INTR, printk("%02x", scsi_pointer->Status))
974                     if (hostdata->level2 >= L2_BASIC) {
975                         sr = read_wd33c93(regs, WD_SCSI_STATUS);        /* clear interrupt */
976                         udelay(7);
977                         hostdata->state = S_RUNNING_LEVEL2;
978                         write_wd33c93(regs, WD_COMMAND_PHASE, 0x50);
979                         write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
980                 } else {
981                         hostdata->state = S_CONNECTED;
982                 }
983                 spin_unlock_irqrestore(&hostdata->lock, flags);
984                 break;
985
986         case CSR_XFER_DONE | PHS_MESS_IN:
987         case CSR_UNEXP | PHS_MESS_IN:
988         case CSR_SRV_REQ | PHS_MESS_IN:
989                 DB(DB_INTR, printk("MSG_IN="))
990
991                 msg = read_1_byte(regs);
992                 sr = read_wd33c93(regs, WD_SCSI_STATUS);        /* clear interrupt */
993                 udelay(7);
994
995                 hostdata->incoming_msg[hostdata->incoming_ptr] = msg;
996                 if (hostdata->incoming_msg[0] == EXTENDED_MESSAGE)
997                         msg = EXTENDED_MESSAGE;
998                 else
999                         hostdata->incoming_ptr = 0;
1000
1001                 scsi_pointer->Message = msg;
1002                 switch (msg) {
1003
1004                 case COMMAND_COMPLETE:
1005                         DB(DB_INTR, printk("CCMP"))
1006                             write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1007                         hostdata->state = S_PRE_CMP_DISC;
1008                         break;
1009
1010                 case SAVE_POINTERS:
1011                         DB(DB_INTR, printk("SDP"))
1012                             write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1013                         hostdata->state = S_CONNECTED;
1014                         break;
1015
1016                 case RESTORE_POINTERS:
1017                         DB(DB_INTR, printk("RDP"))
1018                             if (hostdata->level2 >= L2_BASIC) {
1019                                 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
1020                                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1021                                 hostdata->state = S_RUNNING_LEVEL2;
1022                         } else {
1023                                 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1024                                 hostdata->state = S_CONNECTED;
1025                         }
1026                         break;
1027
1028                 case DISCONNECT:
1029                         DB(DB_INTR, printk("DIS"))
1030                             cmd->device->disconnect = 1;
1031                         write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1032                         hostdata->state = S_PRE_TMP_DISC;
1033                         break;
1034
1035                 case MESSAGE_REJECT:
1036                         DB(DB_INTR, printk("REJ"))
1037 #ifdef SYNC_DEBUG
1038                             printk("-REJ-");
1039 #endif
1040                         if (hostdata->sync_stat[cmd->device->id] == SS_WAITING) {
1041                                 hostdata->sync_stat[cmd->device->id] = SS_SET;
1042                                 /* we want default_sx_per, not DEFAULT_SX_PER */
1043                                 hostdata->sync_xfer[cmd->device->id] =
1044                                         calc_sync_xfer(hostdata->default_sx_per
1045                                                 / 4, 0, 0, hostdata->sx_table);
1046                         }
1047                         write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1048                         hostdata->state = S_CONNECTED;
1049                         break;
1050
1051                 case EXTENDED_MESSAGE:
1052                         DB(DB_INTR, printk("EXT"))
1053
1054                             ucp = hostdata->incoming_msg;
1055
1056 #ifdef SYNC_DEBUG
1057                         printk("%02x", ucp[hostdata->incoming_ptr]);
1058 #endif
1059                         /* Is this the last byte of the extended message? */
1060
1061                         if ((hostdata->incoming_ptr >= 2) &&
1062                             (hostdata->incoming_ptr == (ucp[1] + 1))) {
1063
1064                                 switch (ucp[2]) {       /* what's the EXTENDED code? */
1065                                 case EXTENDED_SDTR:
1066                                         /* default to default async period */
1067                                         id = calc_sync_xfer(hostdata->
1068                                                         default_sx_per / 4, 0,
1069                                                         0, hostdata->sx_table);
1070                                         if (hostdata->sync_stat[cmd->device->id] !=
1071                                             SS_WAITING) {
1072
1073 /* A device has sent an unsolicited SDTR message; rather than go
1074  * through the effort of decoding it and then figuring out what
1075  * our reply should be, we're just gonna say that we have a
1076  * synchronous fifo depth of 0. This will result in asynchronous
1077  * transfers - not ideal but so much easier.
1078  * Actually, this is OK because it assures us that if we don't
1079  * specifically ask for sync transfers, we won't do any.
1080  */
1081
1082                                                 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1083                                                 hostdata->outgoing_msg[0] =
1084                                                     EXTENDED_MESSAGE;
1085                                                 hostdata->outgoing_msg[1] = 3;
1086                                                 hostdata->outgoing_msg[2] =
1087                                                     EXTENDED_SDTR;
1088                                                 calc_sync_msg(hostdata->
1089                                                         default_sx_per, 0,
1090                                                         0, hostdata->outgoing_msg + 3);
1091                                                 hostdata->outgoing_len = 5;
1092                                         } else {
1093                                                 if (ucp[4]) /* well, sync transfer */
1094                                                         id = calc_sync_xfer(ucp[3], ucp[4],
1095                                                                         hostdata->fast,
1096                                                                         hostdata->sx_table);
1097                                                 else if (ucp[3]) /* very unlikely... */
1098                                                         id = calc_sync_xfer(ucp[3], ucp[4],
1099                                                                         0, hostdata->sx_table);
1100                                         }
1101                                         hostdata->sync_xfer[cmd->device->id] = id;
1102 #ifdef SYNC_DEBUG
1103                                         printk(" sync_xfer=%02x\n",
1104                                                hostdata->sync_xfer[cmd->device->id]);
1105 #endif
1106                                         hostdata->sync_stat[cmd->device->id] =
1107                                             SS_SET;
1108                                         write_wd33c93_cmd(regs,
1109                                                           WD_CMD_NEGATE_ACK);
1110                                         hostdata->state = S_CONNECTED;
1111                                         break;
1112                                 case EXTENDED_WDTR:
1113                                         write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1114                                         printk("sending WDTR ");
1115                                         hostdata->outgoing_msg[0] =
1116                                             EXTENDED_MESSAGE;
1117                                         hostdata->outgoing_msg[1] = 2;
1118                                         hostdata->outgoing_msg[2] =
1119                                             EXTENDED_WDTR;
1120                                         hostdata->outgoing_msg[3] = 0;  /* 8 bit transfer width */
1121                                         hostdata->outgoing_len = 4;
1122                                         write_wd33c93_cmd(regs,
1123                                                           WD_CMD_NEGATE_ACK);
1124                                         hostdata->state = S_CONNECTED;
1125                                         break;
1126                                 default:
1127                                         write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1128                                         printk
1129                                             ("Rejecting Unknown Extended Message(%02x). ",
1130                                              ucp[2]);
1131                                         hostdata->outgoing_msg[0] =
1132                                             MESSAGE_REJECT;
1133                                         hostdata->outgoing_len = 1;
1134                                         write_wd33c93_cmd(regs,
1135                                                           WD_CMD_NEGATE_ACK);
1136                                         hostdata->state = S_CONNECTED;
1137                                         break;
1138                                 }
1139                                 hostdata->incoming_ptr = 0;
1140                         }
1141
1142                         /* We need to read more MESS_IN bytes for the extended message */
1143
1144                         else {
1145                                 hostdata->incoming_ptr++;
1146                                 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1147                                 hostdata->state = S_CONNECTED;
1148                         }
1149                         break;
1150
1151                 default:
1152                         printk("Rejecting Unknown Message(%02x) ", msg);
1153                         write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1154                         hostdata->outgoing_msg[0] = MESSAGE_REJECT;
1155                         hostdata->outgoing_len = 1;
1156                         write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1157                         hostdata->state = S_CONNECTED;
1158                 }
1159                 spin_unlock_irqrestore(&hostdata->lock, flags);
1160                 break;
1161
1162 /* Note: this interrupt will occur only after a LEVEL2 command */
1163
1164         case CSR_SEL_XFER_DONE:
1165
1166 /* Make sure that reselection is enabled at this point - it may
1167  * have been turned off for the command that just completed.
1168  */
1169
1170                 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1171                 if (phs == 0x60) {
1172                         DB(DB_INTR, printk("SX-DONE"))
1173                             scsi_pointer->Message = COMMAND_COMPLETE;
1174                         lun = read_wd33c93(regs, WD_TARGET_LUN);
1175                         DB(DB_INTR, printk(":%d.%d", scsi_pointer->Status, lun))
1176                             hostdata->connected = NULL;
1177                         hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
1178                         hostdata->state = S_UNCONNECTED;
1179                         if (scsi_pointer->Status == ILLEGAL_STATUS_BYTE)
1180                                 scsi_pointer->Status = lun;
1181                         if (cmd->cmnd[0] == REQUEST_SENSE
1182                             && scsi_pointer->Status != SAM_STAT_GOOD) {
1183                                 set_host_byte(cmd, DID_ERROR);
1184                         } else {
1185                                 set_host_byte(cmd, DID_OK);
1186                                 scsi_msg_to_host_byte(cmd, scsi_pointer->Message);
1187                                 set_status_byte(cmd, scsi_pointer->Status);
1188                         }
1189                         scsi_done(cmd);
1190
1191 /* We are no longer  connected to a target - check to see if
1192  * there are commands waiting to be executed.
1193  */
1194                         spin_unlock_irqrestore(&hostdata->lock, flags);
1195                         wd33c93_execute(instance);
1196                 } else {
1197                         printk
1198                             ("%02x:%02x:%02x: Unknown SEL_XFER_DONE phase!!---",
1199                              asr, sr, phs);
1200                         spin_unlock_irqrestore(&hostdata->lock, flags);
1201                 }
1202                 break;
1203
1204 /* Note: this interrupt will occur only after a LEVEL2 command */
1205
1206         case CSR_SDP:
1207                 DB(DB_INTR, printk("SDP"))
1208                     hostdata->state = S_RUNNING_LEVEL2;
1209                 write_wd33c93(regs, WD_COMMAND_PHASE, 0x41);
1210                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1211                 spin_unlock_irqrestore(&hostdata->lock, flags);
1212                 break;
1213
1214         case CSR_XFER_DONE | PHS_MESS_OUT:
1215         case CSR_UNEXP | PHS_MESS_OUT:
1216         case CSR_SRV_REQ | PHS_MESS_OUT:
1217                 DB(DB_INTR, printk("MSG_OUT="))
1218
1219 /* To get here, we've probably requested MESSAGE_OUT and have
1220  * already put the correct bytes in outgoing_msg[] and filled
1221  * in outgoing_len. We simply send them out to the SCSI bus.
1222  * Sometimes we get MESSAGE_OUT phase when we're not expecting
1223  * it - like when our SDTR message is rejected by a target. Some
1224  * targets send the REJECT before receiving all of the extended
1225  * message, and then seem to go back to MESSAGE_OUT for a byte
1226  * or two. Not sure why, or if I'm doing something wrong to
1227  * cause this to happen. Regardless, it seems that sending
1228  * NOP messages in these situations results in no harm and
1229  * makes everyone happy.
1230  */
1231                     if (hostdata->outgoing_len == 0) {
1232                         hostdata->outgoing_len = 1;
1233                         hostdata->outgoing_msg[0] = NOP;
1234                 }
1235                 transfer_pio(regs, hostdata->outgoing_msg,
1236                              hostdata->outgoing_len, DATA_OUT_DIR, hostdata);
1237                 DB(DB_INTR, printk("%02x", hostdata->outgoing_msg[0]))
1238                     hostdata->outgoing_len = 0;
1239                 hostdata->state = S_CONNECTED;
1240                 spin_unlock_irqrestore(&hostdata->lock, flags);
1241                 break;
1242
1243         case CSR_UNEXP_DISC:
1244
1245 /* I think I've seen this after a request-sense that was in response
1246  * to an error condition, but not sure. We certainly need to do
1247  * something when we get this interrupt - the question is 'what?'.
1248  * Let's think positively, and assume some command has finished
1249  * in a legal manner (like a command that provokes a request-sense),
1250  * so we treat it as a normal command-complete-disconnect.
1251  */
1252
1253 /* Make sure that reselection is enabled at this point - it may
1254  * have been turned off for the command that just completed.
1255  */
1256
1257                 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1258                 if (cmd == NULL) {
1259                         printk(" - Already disconnected! ");
1260                         hostdata->state = S_UNCONNECTED;
1261                         spin_unlock_irqrestore(&hostdata->lock, flags);
1262                         return;
1263                 }
1264                 DB(DB_INTR, printk("UNEXP_DISC"))
1265                     hostdata->connected = NULL;
1266                 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
1267                 hostdata->state = S_UNCONNECTED;
1268                 if (cmd->cmnd[0] == REQUEST_SENSE &&
1269                     scsi_pointer->Status != SAM_STAT_GOOD) {
1270                         set_host_byte(cmd, DID_ERROR);
1271                 } else {
1272                         set_host_byte(cmd, DID_OK);
1273                         scsi_msg_to_host_byte(cmd, scsi_pointer->Message);
1274                         set_status_byte(cmd, scsi_pointer->Status);
1275                 }
1276                 scsi_done(cmd);
1277
1278 /* We are no longer connected to a target - check to see if
1279  * there are commands waiting to be executed.
1280  */
1281                 /* look above for comments on scsi_done() */
1282                 spin_unlock_irqrestore(&hostdata->lock, flags);
1283                 wd33c93_execute(instance);
1284                 break;
1285
1286         case CSR_DISC:
1287
1288 /* Make sure that reselection is enabled at this point - it may
1289  * have been turned off for the command that just completed.
1290  */
1291
1292                 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1293                 DB(DB_INTR, printk("DISC"))
1294                     if (cmd == NULL) {
1295                         printk(" - Already disconnected! ");
1296                         hostdata->state = S_UNCONNECTED;
1297                 }
1298                 switch (hostdata->state) {
1299                 case S_PRE_CMP_DISC:
1300                         hostdata->connected = NULL;
1301                         hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
1302                         hostdata->state = S_UNCONNECTED;
1303                         DB(DB_INTR, printk(":%d", scsi_pointer->Status))
1304                         if (cmd->cmnd[0] == REQUEST_SENSE
1305                             && scsi_pointer->Status != SAM_STAT_GOOD) {
1306                                 set_host_byte(cmd, DID_ERROR);
1307                         } else {
1308                                 set_host_byte(cmd, DID_OK);
1309                                 scsi_msg_to_host_byte(cmd, scsi_pointer->Message);
1310                                 set_status_byte(cmd, scsi_pointer->Status);
1311                         }
1312                         scsi_done(cmd);
1313                         break;
1314                 case S_PRE_TMP_DISC:
1315                 case S_RUNNING_LEVEL2:
1316                         cmd->host_scribble = (uchar *) hostdata->disconnected_Q;
1317                         hostdata->disconnected_Q = cmd;
1318                         hostdata->connected = NULL;
1319                         hostdata->state = S_UNCONNECTED;
1320
1321 #ifdef PROC_STATISTICS
1322                         hostdata->disc_done_cnt[cmd->device->id]++;
1323 #endif
1324
1325                         break;
1326                 default:
1327                         printk("*** Unexpected DISCONNECT interrupt! ***");
1328                         hostdata->state = S_UNCONNECTED;
1329                 }
1330
1331 /* We are no longer connected to a target - check to see if
1332  * there are commands waiting to be executed.
1333  */
1334                 spin_unlock_irqrestore(&hostdata->lock, flags);
1335                 wd33c93_execute(instance);
1336                 break;
1337
1338         case CSR_RESEL_AM:
1339         case CSR_RESEL:
1340                 DB(DB_INTR, printk("RESEL%s", sr == CSR_RESEL_AM ? "_AM" : ""))
1341
1342                     /* Old chips (pre -A ???) don't have advanced features and will
1343                      * generate CSR_RESEL.  In that case we have to extract the LUN the
1344                      * hard way (see below).
1345                      * First we have to make sure this reselection didn't
1346                      * happen during Arbitration/Selection of some other device.
1347                      * If yes, put losing command back on top of input_Q.
1348                      */
1349                     if (hostdata->level2 <= L2_NONE) {
1350
1351                         if (hostdata->selecting) {
1352                                 cmd = (struct scsi_cmnd *) hostdata->selecting;
1353                                 hostdata->selecting = NULL;
1354                                 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
1355                                 cmd->host_scribble =
1356                                     (uchar *) hostdata->input_Q;
1357                                 hostdata->input_Q = cmd;
1358                         }
1359                 }
1360
1361                 else {
1362
1363                         if (cmd) {
1364                                 if (phs == 0x00) {
1365                                         hostdata->busy[cmd->device->id] &=
1366                                                 ~(1 << (cmd->device->lun & 0xff));
1367                                         cmd->host_scribble =
1368                                             (uchar *) hostdata->input_Q;
1369                                         hostdata->input_Q = cmd;
1370                                 } else {
1371                                         printk
1372                                             ("---%02x:%02x:%02x-TROUBLE: Intrusive ReSelect!---",
1373                                              asr, sr, phs);
1374                                         while (1)
1375                                                 printk("\r");
1376                                 }
1377                         }
1378
1379                 }
1380
1381                 /* OK - find out which device reselected us. */
1382
1383                 id = read_wd33c93(regs, WD_SOURCE_ID);
1384                 id &= SRCID_MASK;
1385
1386                 /* and extract the lun from the ID message. (Note that we don't
1387                  * bother to check for a valid message here - I guess this is
1388                  * not the right way to go, but...)
1389                  */
1390
1391                 if (sr == CSR_RESEL_AM) {
1392                         lun = read_wd33c93(regs, WD_DATA);
1393                         if (hostdata->level2 < L2_RESELECT)
1394                                 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1395                         lun &= 7;
1396                 } else {
1397                         /* Old chip; wait for msgin phase to pick up the LUN. */
1398                         for (lun = 255; lun; lun--) {
1399                                 if ((asr = read_aux_stat(regs)) & ASR_INT)
1400                                         break;
1401                                 udelay(10);
1402                         }
1403                         if (!(asr & ASR_INT)) {
1404                                 printk
1405                                     ("wd33c93: Reselected without IDENTIFY\n");
1406                                 lun = 0;
1407                         } else {
1408                                 /* Verify this is a change to MSG_IN and read the message */
1409                                 sr = read_wd33c93(regs, WD_SCSI_STATUS);
1410                                 udelay(7);
1411                                 if (sr == (CSR_ABORT | PHS_MESS_IN) ||
1412                                     sr == (CSR_UNEXP | PHS_MESS_IN) ||
1413                                     sr == (CSR_SRV_REQ | PHS_MESS_IN)) {
1414                                         /* Got MSG_IN, grab target LUN */
1415                                         lun = read_1_byte(regs);
1416                                         /* Now we expect a 'paused with ACK asserted' int.. */
1417                                         asr = read_aux_stat(regs);
1418                                         if (!(asr & ASR_INT)) {
1419                                                 udelay(10);
1420                                                 asr = read_aux_stat(regs);
1421                                                 if (!(asr & ASR_INT))
1422                                                         printk
1423                                                             ("wd33c93: No int after LUN on RESEL (%02x)\n",
1424                                                              asr);
1425                                         }
1426                                         sr = read_wd33c93(regs, WD_SCSI_STATUS);
1427                                         udelay(7);
1428                                         if (sr != CSR_MSGIN)
1429                                                 printk
1430                                                     ("wd33c93: Not paused with ACK on RESEL (%02x)\n",
1431                                                      sr);
1432                                         lun &= 7;
1433                                         write_wd33c93_cmd(regs,
1434                                                           WD_CMD_NEGATE_ACK);
1435                                 } else {
1436                                         printk
1437                                             ("wd33c93: Not MSG_IN on reselect (%02x)\n",
1438                                              sr);
1439                                         lun = 0;
1440                                 }
1441                         }
1442                 }
1443
1444                 /* Now we look for the command that's reconnecting. */
1445
1446                 cmd = (struct scsi_cmnd *) hostdata->disconnected_Q;
1447                 patch = NULL;
1448                 while (cmd) {
1449                         if (id == cmd->device->id && lun == (u8)cmd->device->lun)
1450                                 break;
1451                         patch = cmd;
1452                         cmd = (struct scsi_cmnd *) cmd->host_scribble;
1453                 }
1454
1455                 /* Hmm. Couldn't find a valid command.... What to do? */
1456
1457                 if (!cmd) {
1458                         printk
1459                             ("---TROUBLE: target %d.%d not in disconnect queue---",
1460                              id, (u8)lun);
1461                         spin_unlock_irqrestore(&hostdata->lock, flags);
1462                         return;
1463                 }
1464
1465                 /* Ok, found the command - now start it up again. */
1466
1467                 if (patch)
1468                         patch->host_scribble = cmd->host_scribble;
1469                 else
1470                         hostdata->disconnected_Q =
1471                             (struct scsi_cmnd *) cmd->host_scribble;
1472                 hostdata->connected = cmd;
1473
1474                 /* We don't need to worry about 'initialize_SCp()' or 'hostdata->busy[]'
1475                  * because these things are preserved over a disconnect.
1476                  * But we DO need to fix the DPD bit so it's correct for this command.
1477                  */
1478
1479                 if (cmd->sc_data_direction == DMA_TO_DEVICE)
1480                         write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);
1481                 else
1482                         write_wd33c93(regs, WD_DESTINATION_ID,
1483                                       cmd->device->id | DSTID_DPD);
1484                 if (hostdata->level2 >= L2_RESELECT) {
1485                         write_wd33c93_count(regs, 0);   /* we want a DATA_PHASE interrupt */
1486                         write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
1487                         write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1488                         hostdata->state = S_RUNNING_LEVEL2;
1489                 } else
1490                         hostdata->state = S_CONNECTED;
1491
1492                     spin_unlock_irqrestore(&hostdata->lock, flags);
1493                 break;
1494
1495         default:
1496                 printk("--UNKNOWN INTERRUPT:%02x:%02x:%02x--", asr, sr, phs);
1497                 spin_unlock_irqrestore(&hostdata->lock, flags);
1498         }
1499
1500         DB(DB_INTR, printk("} "))
1501
1502 }
1503
1504 static void
1505 reset_wd33c93(struct Scsi_Host *instance)
1506 {
1507         struct WD33C93_hostdata *hostdata =
1508             (struct WD33C93_hostdata *) instance->hostdata;
1509         const wd33c93_regs regs = hostdata->regs;
1510         uchar sr;
1511
1512 #ifdef CONFIG_SGI_IP22
1513         {
1514                 int busycount = 0;
1515                 extern void sgiwd93_reset(unsigned long);
1516                 /* wait 'til the chip gets some time for us */
1517                 while ((read_aux_stat(regs) & ASR_BSY) && busycount++ < 100)
1518                         udelay (10);
1519         /*
1520          * there are scsi devices out there, which manage to lock up
1521          * the wd33c93 in a busy condition. In this state it won't
1522          * accept the reset command. The only way to solve this is to
1523          * give the chip a hardware reset (if possible). The code below
1524          * does this for the SGI Indy, where this is possible
1525          */
1526         /* still busy ? */
1527         if (read_aux_stat(regs) & ASR_BSY)
1528                 sgiwd93_reset(instance->base); /* yeah, give it the hard one */
1529         }
1530 #endif
1531
1532         write_wd33c93(regs, WD_OWN_ID, OWNID_EAF | OWNID_RAF |
1533                       instance->this_id | hostdata->clock_freq);
1534         write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1535         write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
1536                       calc_sync_xfer(hostdata->default_sx_per / 4,
1537                                      DEFAULT_SX_OFF, 0, hostdata->sx_table));
1538         write_wd33c93(regs, WD_COMMAND, WD_CMD_RESET);
1539
1540
1541 #ifdef CONFIG_MVME147_SCSI
1542         udelay(25);             /* The old wd33c93 on MVME147 needs this, at least */
1543 #endif
1544
1545         while (!(read_aux_stat(regs) & ASR_INT))
1546                 ;
1547         sr = read_wd33c93(regs, WD_SCSI_STATUS);
1548
1549         hostdata->microcode = read_wd33c93(regs, WD_CDB_1);
1550         if (sr == 0x00)
1551                 hostdata->chip = C_WD33C93;
1552         else if (sr == 0x01) {
1553                 write_wd33c93(regs, WD_QUEUE_TAG, 0xa5);        /* any random number */
1554                 sr = read_wd33c93(regs, WD_QUEUE_TAG);
1555                 if (sr == 0xa5) {
1556                         hostdata->chip = C_WD33C93B;
1557                         write_wd33c93(regs, WD_QUEUE_TAG, 0);
1558                 } else
1559                         hostdata->chip = C_WD33C93A;
1560         } else
1561                 hostdata->chip = C_UNKNOWN_CHIP;
1562
1563         if (hostdata->chip != C_WD33C93B)       /* Fast SCSI unavailable */
1564                 hostdata->fast = 0;
1565
1566         write_wd33c93(regs, WD_TIMEOUT_PERIOD, TIMEOUT_PERIOD_VALUE);
1567         write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1568 }
1569
1570 int
1571 wd33c93_host_reset(struct scsi_cmnd * SCpnt)
1572 {
1573         struct Scsi_Host *instance;
1574         struct WD33C93_hostdata *hostdata;
1575         int i;
1576
1577         instance = SCpnt->device->host;
1578         spin_lock_irq(instance->host_lock);
1579         hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1580
1581         printk("scsi%d: reset. ", instance->host_no);
1582         disable_irq(instance->irq);
1583
1584         hostdata->dma_stop(instance, NULL, 0);
1585         for (i = 0; i < 8; i++) {
1586                 hostdata->busy[i] = 0;
1587                 hostdata->sync_xfer[i] =
1588                         calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF,
1589                                         0, hostdata->sx_table);
1590                 hostdata->sync_stat[i] = SS_UNSET;      /* using default sync values */
1591         }
1592         hostdata->input_Q = NULL;
1593         hostdata->selecting = NULL;
1594         hostdata->connected = NULL;
1595         hostdata->disconnected_Q = NULL;
1596         hostdata->state = S_UNCONNECTED;
1597         hostdata->dma = D_DMA_OFF;
1598         hostdata->incoming_ptr = 0;
1599         hostdata->outgoing_len = 0;
1600
1601         reset_wd33c93(instance);
1602         SCpnt->result = DID_RESET << 16;
1603         enable_irq(instance->irq);
1604         spin_unlock_irq(instance->host_lock);
1605         return SUCCESS;
1606 }
1607
1608 int
1609 wd33c93_abort(struct scsi_cmnd * cmd)
1610 {
1611         struct Scsi_Host *instance;
1612         struct WD33C93_hostdata *hostdata;
1613         wd33c93_regs regs;
1614         struct scsi_cmnd *tmp, *prev;
1615
1616         disable_irq(cmd->device->host->irq);
1617
1618         instance = cmd->device->host;
1619         hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1620         regs = hostdata->regs;
1621
1622 /*
1623  * Case 1 : If the command hasn't been issued yet, we simply remove it
1624  *     from the input_Q.
1625  */
1626
1627         tmp = (struct scsi_cmnd *) hostdata->input_Q;
1628         prev = NULL;
1629         while (tmp) {
1630                 if (tmp == cmd) {
1631                         if (prev)
1632                                 prev->host_scribble = cmd->host_scribble;
1633                         else
1634                                 hostdata->input_Q =
1635                                     (struct scsi_cmnd *) cmd->host_scribble;
1636                         cmd->host_scribble = NULL;
1637                         cmd->result = DID_ABORT << 16;
1638                         printk
1639                             ("scsi%d: Abort - removing command from input_Q. ",
1640                              instance->host_no);
1641                         enable_irq(cmd->device->host->irq);
1642                         scsi_done(cmd);
1643                         return SUCCESS;
1644                 }
1645                 prev = tmp;
1646                 tmp = (struct scsi_cmnd *) tmp->host_scribble;
1647         }
1648
1649 /*
1650  * Case 2 : If the command is connected, we're going to fail the abort
1651  *     and let the high level SCSI driver retry at a later time or
1652  *     issue a reset.
1653  *
1654  *     Timeouts, and therefore aborted commands, will be highly unlikely
1655  *     and handling them cleanly in this situation would make the common
1656  *     case of noresets less efficient, and would pollute our code.  So,
1657  *     we fail.
1658  */
1659
1660         if (hostdata->connected == cmd) {
1661                 uchar sr, asr;
1662                 unsigned long timeout;
1663
1664                 printk("scsi%d: Aborting connected command - ",
1665                        instance->host_no);
1666
1667                 printk("stopping DMA - ");
1668                 if (hostdata->dma == D_DMA_RUNNING) {
1669                         hostdata->dma_stop(instance, cmd, 0);
1670                         hostdata->dma = D_DMA_OFF;
1671                 }
1672
1673                 printk("sending wd33c93 ABORT command - ");
1674                 write_wd33c93(regs, WD_CONTROL,
1675                               CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1676                 write_wd33c93_cmd(regs, WD_CMD_ABORT);
1677
1678 /* Now we have to attempt to flush out the FIFO... */
1679
1680                 printk("flushing fifo - ");
1681                 timeout = 1000000;
1682                 do {
1683                         asr = read_aux_stat(regs);
1684                         if (asr & ASR_DBR)
1685                                 read_wd33c93(regs, WD_DATA);
1686                 } while (!(asr & ASR_INT) && timeout-- > 0);
1687                 sr = read_wd33c93(regs, WD_SCSI_STATUS);
1688                 printk
1689                     ("asr=%02x, sr=%02x, %ld bytes un-transferred (timeout=%ld) - ",
1690                      asr, sr, read_wd33c93_count(regs), timeout);
1691
1692                 /*
1693                  * Abort command processed.
1694                  * Still connected.
1695                  * We must disconnect.
1696                  */
1697
1698                 printk("sending wd33c93 DISCONNECT command - ");
1699                 write_wd33c93_cmd(regs, WD_CMD_DISCONNECT);
1700
1701                 timeout = 1000000;
1702                 asr = read_aux_stat(regs);
1703                 while ((asr & ASR_CIP) && timeout-- > 0)
1704                         asr = read_aux_stat(regs);
1705                 sr = read_wd33c93(regs, WD_SCSI_STATUS);
1706                 printk("asr=%02x, sr=%02x.", asr, sr);
1707
1708                 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
1709                 hostdata->connected = NULL;
1710                 hostdata->state = S_UNCONNECTED;
1711                 cmd->result = DID_ABORT << 16;
1712
1713 /*      sti();*/
1714                 wd33c93_execute(instance);
1715
1716                 enable_irq(cmd->device->host->irq);
1717                 scsi_done(cmd);
1718                 return SUCCESS;
1719         }
1720
1721 /*
1722  * Case 3: If the command is currently disconnected from the bus,
1723  * we're not going to expend much effort here: Let's just return
1724  * an ABORT_SNOOZE and hope for the best...
1725  */
1726
1727         tmp = (struct scsi_cmnd *) hostdata->disconnected_Q;
1728         while (tmp) {
1729                 if (tmp == cmd) {
1730                         printk
1731                             ("scsi%d: Abort - command found on disconnected_Q - ",
1732                              instance->host_no);
1733                         printk("Abort SNOOZE. ");
1734                         enable_irq(cmd->device->host->irq);
1735                         return FAILED;
1736                 }
1737                 tmp = (struct scsi_cmnd *) tmp->host_scribble;
1738         }
1739
1740 /*
1741  * Case 4 : If we reached this point, the command was not found in any of
1742  *     the queues.
1743  *
1744  * We probably reached this point because of an unlikely race condition
1745  * between the command completing successfully and the abortion code,
1746  * so we won't panic, but we will notify the user in case something really
1747  * broke.
1748  */
1749
1750 /*   sti();*/
1751         wd33c93_execute(instance);
1752
1753         enable_irq(cmd->device->host->irq);
1754         printk("scsi%d: warning : SCSI command probably completed successfully"
1755                "         before abortion. ", instance->host_no);
1756         return FAILED;
1757 }
1758
1759 #define MAX_WD33C93_HOSTS 4
1760 #define MAX_SETUP_ARGS ARRAY_SIZE(setup_args)
1761 #define SETUP_BUFFER_SIZE 200
1762 static char setup_buffer[SETUP_BUFFER_SIZE];
1763 static char setup_used[MAX_SETUP_ARGS];
1764 static int done_setup = 0;
1765
1766 static int
1767 wd33c93_setup(char *str)
1768 {
1769         int i;
1770         char *p1, *p2;
1771
1772         /* The kernel does some processing of the command-line before calling
1773          * this function: If it begins with any decimal or hex number arguments,
1774          * ints[0] = how many numbers found and ints[1] through [n] are the values
1775          * themselves. str points to where the non-numeric arguments (if any)
1776          * start: We do our own parsing of those. We construct synthetic 'nosync'
1777          * keywords out of numeric args (to maintain compatibility with older
1778          * versions) and then add the rest of the arguments.
1779          */
1780
1781         p1 = setup_buffer;
1782         *p1 = '\0';
1783         if (str)
1784                 strncpy(p1, str, SETUP_BUFFER_SIZE - strlen(setup_buffer));
1785         setup_buffer[SETUP_BUFFER_SIZE - 1] = '\0';
1786         p1 = setup_buffer;
1787         i = 0;
1788         while (*p1 && (i < MAX_SETUP_ARGS)) {
1789                 p2 = strchr(p1, ',');
1790                 if (p2) {
1791                         *p2 = '\0';
1792                         if (p1 != p2)
1793                                 setup_args[i] = p1;
1794                         p1 = p2 + 1;
1795                         i++;
1796                 } else {
1797                         setup_args[i] = p1;
1798                         break;
1799                 }
1800         }
1801         for (i = 0; i < MAX_SETUP_ARGS; i++)
1802                 setup_used[i] = 0;
1803         done_setup = 1;
1804
1805         return 1;
1806 }
1807 __setup("wd33c93=", wd33c93_setup);
1808
1809 /* check_setup_args() returns index if key found, 0 if not
1810  */
1811 static int
1812 check_setup_args(char *key, int *flags, int *val, char *buf)
1813 {
1814         int x;
1815         char *cp;
1816
1817         for (x = 0; x < MAX_SETUP_ARGS; x++) {
1818                 if (setup_used[x])
1819                         continue;
1820                 if (!strncmp(setup_args[x], key, strlen(key)))
1821                         break;
1822                 if (!strncmp(setup_args[x], "next", strlen("next")))
1823                         return 0;
1824         }
1825         if (x == MAX_SETUP_ARGS)
1826                 return 0;
1827         setup_used[x] = 1;
1828         cp = setup_args[x] + strlen(key);
1829         *val = -1;
1830         if (*cp != ':')
1831                 return ++x;
1832         cp++;
1833         if ((*cp >= '0') && (*cp <= '9')) {
1834                 *val = simple_strtoul(cp, NULL, 0);
1835         }
1836         return ++x;
1837 }
1838
1839 /*
1840  * Calculate internal data-transfer-clock cycle from input-clock
1841  * frequency (/MHz) and fill 'sx_table'.
1842  *
1843  * The original driver used to rely on a fixed sx_table, containing periods
1844  * for (only) the lower limits of the respective input-clock-frequency ranges
1845  * (8-10/12-15/16-20 MHz). Although it seems, that no problems occurred with
1846  * this setting so far, it might be desirable to adjust the transfer periods
1847  * closer to the really attached, possibly 25% higher, input-clock, since
1848  * - the wd33c93 may really use a significant shorter period, than it has
1849  *   negotiated (eg. thrashing the target, which expects 4/8MHz, with 5/10MHz
1850  *   instead).
1851  * - the wd33c93 may ask the target for a lower transfer rate, than the target
1852  *   is capable of (eg. negotiating for an assumed minimum of 252ns instead of
1853  *   possible 200ns, which indeed shows up in tests as an approx. 10% lower
1854  *   transfer rate).
1855  */
1856 static inline unsigned int
1857 round_4(unsigned int x)
1858 {
1859         switch (x & 3) {
1860                 case 1: --x;
1861                         break;
1862                 case 2: ++x;
1863                         fallthrough;
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\n", WD33C93_VERSION, WD33C93_DATE);
2056 }
2057
2058 int wd33c93_write_info(struct Scsi_Host *instance, char *buf, int len)
2059 {
2060 #ifdef PROC_INTERFACE
2061         char *bp;
2062         struct WD33C93_hostdata *hd;
2063         int x;
2064
2065         hd = (struct WD33C93_hostdata *) instance->hostdata;
2066
2067 /* We accept the following
2068  * keywords (same format as command-line, but arguments are not optional):
2069  *    debug
2070  *    disconnect
2071  *    period
2072  *    resync
2073  *    proc
2074  *    nodma
2075  *    level2
2076  *    burst
2077  *    fast
2078  *    nosync
2079  */
2080
2081         buf[len] = '\0';
2082         for (bp = buf; *bp; ) {
2083                 while (',' == *bp || ' ' == *bp)
2084                         ++bp;
2085         if (!strncmp(bp, "debug:", 6)) {
2086                         hd->args = simple_strtoul(bp+6, &bp, 0) & DB_MASK;
2087         } else if (!strncmp(bp, "disconnect:", 11)) {
2088                         x = simple_strtoul(bp+11, &bp, 0);
2089                 if (x < DIS_NEVER || x > DIS_ALWAYS)
2090                         x = DIS_ADAPTIVE;
2091                 hd->disconnect = x;
2092         } else if (!strncmp(bp, "period:", 7)) {
2093                 x = simple_strtoul(bp+7, &bp, 0);
2094                 hd->default_sx_per =
2095                         hd->sx_table[round_period((unsigned int) x,
2096                                                   hd->sx_table)].period_ns;
2097         } else if (!strncmp(bp, "resync:", 7)) {
2098                         set_resync(hd, (int)simple_strtoul(bp+7, &bp, 0));
2099         } else if (!strncmp(bp, "proc:", 5)) {
2100                         hd->proc = simple_strtoul(bp+5, &bp, 0);
2101         } else if (!strncmp(bp, "nodma:", 6)) {
2102                         hd->no_dma = simple_strtoul(bp+6, &bp, 0);
2103         } else if (!strncmp(bp, "level2:", 7)) {
2104                         hd->level2 = simple_strtoul(bp+7, &bp, 0);
2105                 } else if (!strncmp(bp, "burst:", 6)) {
2106                         hd->dma_mode =
2107                                 simple_strtol(bp+6, &bp, 0) ? CTRL_BURST:CTRL_DMA;
2108                 } else if (!strncmp(bp, "fast:", 5)) {
2109                         x = !!simple_strtol(bp+5, &bp, 0);
2110                         if (x != hd->fast)
2111                                 set_resync(hd, 0xff);
2112                         hd->fast = x;
2113                 } else if (!strncmp(bp, "nosync:", 7)) {
2114                         x = simple_strtoul(bp+7, &bp, 0);
2115                         set_resync(hd, x ^ hd->no_sync);
2116                         hd->no_sync = x;
2117                 } else {
2118                         break; /* unknown keyword,syntax-error,... */
2119                 }
2120         }
2121         return len;
2122 #else
2123         return 0;
2124 #endif
2125 }
2126
2127 int
2128 wd33c93_show_info(struct seq_file *m, struct Scsi_Host *instance)
2129 {
2130 #ifdef PROC_INTERFACE
2131         struct WD33C93_hostdata *hd;
2132         struct scsi_cmnd *cmd;
2133         int x;
2134
2135         hd = (struct WD33C93_hostdata *) instance->hostdata;
2136
2137         spin_lock_irq(&hd->lock);
2138         if (hd->proc & PR_VERSION)
2139                 seq_printf(m, "\nVersion %s - %s.",
2140                         WD33C93_VERSION, WD33C93_DATE);
2141
2142         if (hd->proc & PR_INFO) {
2143                 seq_printf(m, "\nclock_freq=%02x no_sync=%02x no_dma=%d"
2144                         " dma_mode=%02x fast=%d",
2145                         hd->clock_freq, hd->no_sync, hd->no_dma, hd->dma_mode, hd->fast);
2146                 seq_puts(m, "\nsync_xfer[] =       ");
2147                 for (x = 0; x < 7; x++)
2148                         seq_printf(m, "\t%02x", hd->sync_xfer[x]);
2149                 seq_puts(m, "\nsync_stat[] =       ");
2150                 for (x = 0; x < 7; x++)
2151                         seq_printf(m, "\t%02x", hd->sync_stat[x]);
2152         }
2153 #ifdef PROC_STATISTICS
2154         if (hd->proc & PR_STATISTICS) {
2155                 seq_puts(m, "\ncommands issued:    ");
2156                 for (x = 0; x < 7; x++)
2157                         seq_printf(m, "\t%ld", hd->cmd_cnt[x]);
2158                 seq_puts(m, "\ndisconnects allowed:");
2159                 for (x = 0; x < 7; x++)
2160                         seq_printf(m, "\t%ld", hd->disc_allowed_cnt[x]);
2161                 seq_puts(m, "\ndisconnects done:   ");
2162                 for (x = 0; x < 7; x++)
2163                         seq_printf(m, "\t%ld", hd->disc_done_cnt[x]);
2164                 seq_printf(m,
2165                         "\ninterrupts: %ld, DATA_PHASE ints: %ld DMA, %ld PIO",
2166                         hd->int_cnt, hd->dma_cnt, hd->pio_cnt);
2167         }
2168 #endif
2169         if (hd->proc & PR_CONNECTED) {
2170                 seq_puts(m, "\nconnected:     ");
2171                 if (hd->connected) {
2172                         cmd = (struct scsi_cmnd *) hd->connected;
2173                         seq_printf(m, " %d:%llu(%02x)",
2174                                 cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2175                 }
2176         }
2177         if (hd->proc & PR_INPUTQ) {
2178                 seq_puts(m, "\ninput_Q:       ");
2179                 cmd = (struct scsi_cmnd *) hd->input_Q;
2180                 while (cmd) {
2181                         seq_printf(m, " %d:%llu(%02x)",
2182                                 cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2183                         cmd = (struct scsi_cmnd *) cmd->host_scribble;
2184                 }
2185         }
2186         if (hd->proc & PR_DISCQ) {
2187                 seq_puts(m, "\ndisconnected_Q:");
2188                 cmd = (struct scsi_cmnd *) hd->disconnected_Q;
2189                 while (cmd) {
2190                         seq_printf(m, " %d:%llu(%02x)",
2191                                 cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2192                         cmd = (struct scsi_cmnd *) cmd->host_scribble;
2193                 }
2194         }
2195         seq_putc(m, '\n');
2196         spin_unlock_irq(&hd->lock);
2197 #endif                          /* PROC_INTERFACE */
2198         return 0;
2199 }
2200
2201 EXPORT_SYMBOL(wd33c93_host_reset);
2202 EXPORT_SYMBOL(wd33c93_init);
2203 EXPORT_SYMBOL(wd33c93_abort);
2204 EXPORT_SYMBOL(wd33c93_queuecommand);
2205 EXPORT_SYMBOL(wd33c93_intr);
2206 EXPORT_SYMBOL(wd33c93_show_info);
2207 EXPORT_SYMBOL(wd33c93_write_info);