GNU Linux-libre 5.10.219-gnu1
[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
366 wd33c93_queuecommand_lck(struct scsi_cmnd *cmd,
367                 void (*done)(struct scsi_cmnd *))
368 {
369         struct WD33C93_hostdata *hostdata;
370         struct scsi_cmnd *tmp;
371
372         hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata;
373
374         DB(DB_QUEUE_COMMAND,
375            printk("Q-%d-%02x( ", cmd->device->id, cmd->cmnd[0]))
376
377 /* Set up a few fields in the scsi_cmnd structure for our own use:
378  *  - host_scribble is the pointer to the next cmd in the input queue
379  *  - scsi_done points to the routine we call when a cmd is finished
380  *  - result is what you'd expect
381  */
382         cmd->host_scribble = NULL;
383         cmd->scsi_done = done;
384         cmd->result = 0;
385
386 /* We use the Scsi_Pointer structure that's included with each command
387  * as a scratchpad (as it's intended to be used!). The handy thing about
388  * the SCp.xxx fields is that they're always associated with a given
389  * cmd, and are preserved across disconnect-reselect. This means we
390  * can pretty much ignore SAVE_POINTERS and RESTORE_POINTERS messages
391  * if we keep all the critical pointers and counters in SCp:
392  *  - SCp.ptr is the pointer into the RAM buffer
393  *  - SCp.this_residual is the size of that buffer
394  *  - SCp.buffer points to the current scatter-gather buffer
395  *  - SCp.buffers_residual tells us how many S.G. buffers there are
396  *  - SCp.have_data_in is not used
397  *  - SCp.sent_command is not used
398  *  - SCp.phase records this command's SRCID_ER bit setting
399  */
400
401         if (scsi_bufflen(cmd)) {
402                 cmd->SCp.buffer = scsi_sglist(cmd);
403                 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
404                 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
405                 cmd->SCp.this_residual = cmd->SCp.buffer->length;
406         } else {
407                 cmd->SCp.buffer = NULL;
408                 cmd->SCp.buffers_residual = 0;
409                 cmd->SCp.ptr = NULL;
410                 cmd->SCp.this_residual = 0;
411         }
412
413 /* WD docs state that at the conclusion of a "LEVEL2" command, the
414  * status byte can be retrieved from the LUN register. Apparently,
415  * this is the case only for *uninterrupted* LEVEL2 commands! If
416  * there are any unexpected phases entered, even if they are 100%
417  * legal (different devices may choose to do things differently),
418  * the LEVEL2 command sequence is exited. This often occurs prior
419  * to receiving the status byte, in which case the driver does a
420  * status phase interrupt and gets the status byte on its own.
421  * While such a command can then be "resumed" (ie restarted to
422  * finish up as a LEVEL2 command), the LUN register will NOT be
423  * a valid status byte at the command's conclusion, and we must
424  * use the byte obtained during the earlier interrupt. Here, we
425  * preset SCp.Status to an illegal value (0xff) so that when
426  * this command finally completes, we can tell where the actual
427  * status byte is stored.
428  */
429
430         cmd->SCp.Status = ILLEGAL_STATUS_BYTE;
431
432         /*
433          * Add the cmd to the end of 'input_Q'. Note that REQUEST SENSE
434          * commands are added to the head of the queue so that the desired
435          * sense data is not lost before REQUEST_SENSE executes.
436          */
437
438         spin_lock_irq(&hostdata->lock);
439
440         if (!(hostdata->input_Q) || (cmd->cmnd[0] == REQUEST_SENSE)) {
441                 cmd->host_scribble = (uchar *) hostdata->input_Q;
442                 hostdata->input_Q = cmd;
443         } else {                /* find the end of the queue */
444                 for (tmp = (struct scsi_cmnd *) hostdata->input_Q;
445                      tmp->host_scribble;
446                      tmp = (struct scsi_cmnd *) tmp->host_scribble) ;
447                 tmp->host_scribble = (uchar *) cmd;
448         }
449
450 /* We know that there's at least one command in 'input_Q' now.
451  * Go see if any of them are runnable!
452  */
453
454         wd33c93_execute(cmd->device->host);
455
456         DB(DB_QUEUE_COMMAND, printk(")Q "))
457
458         spin_unlock_irq(&hostdata->lock);
459         return 0;
460 }
461
462 DEF_SCSI_QCMD(wd33c93_queuecommand)
463
464 /*
465  * This routine attempts to start a scsi command. If the host_card is
466  * already connected, we give up immediately. Otherwise, look through
467  * the input_Q, using the first command we find that's intended
468  * for a currently non-busy target/lun.
469  *
470  * wd33c93_execute() is always called with interrupts disabled or from
471  * the wd33c93_intr itself, which means that a wd33c93 interrupt
472  * cannot occur while we are in here.
473  */
474 static void
475 wd33c93_execute(struct Scsi_Host *instance)
476 {
477         struct WD33C93_hostdata *hostdata =
478             (struct WD33C93_hostdata *) instance->hostdata;
479         const wd33c93_regs regs = hostdata->regs;
480         struct scsi_cmnd *cmd, *prev;
481
482         DB(DB_EXECUTE, printk("EX("))
483         if (hostdata->selecting || hostdata->connected) {
484                 DB(DB_EXECUTE, printk(")EX-0 "))
485                 return;
486         }
487
488         /*
489          * Search through the input_Q for a command destined
490          * for an idle target/lun.
491          */
492
493         cmd = (struct scsi_cmnd *) hostdata->input_Q;
494         prev = NULL;
495         while (cmd) {
496                 if (!(hostdata->busy[cmd->device->id] &
497                       (1 << (cmd->device->lun & 0xff))))
498                         break;
499                 prev = cmd;
500                 cmd = (struct scsi_cmnd *) cmd->host_scribble;
501         }
502
503         /* quit if queue empty or all possible targets are busy */
504
505         if (!cmd) {
506                 DB(DB_EXECUTE, printk(")EX-1 "))
507                 return;
508         }
509
510         /*  remove command from queue */
511
512         if (prev)
513                 prev->host_scribble = cmd->host_scribble;
514         else
515                 hostdata->input_Q = (struct scsi_cmnd *) cmd->host_scribble;
516
517 #ifdef PROC_STATISTICS
518         hostdata->cmd_cnt[cmd->device->id]++;
519 #endif
520
521         /*
522          * Start the selection process
523          */
524
525         if (cmd->sc_data_direction == DMA_TO_DEVICE)
526                 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);
527         else
528                 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id | DSTID_DPD);
529
530 /* Now we need to figure out whether or not this command is a good
531  * candidate for disconnect/reselect. We guess to the best of our
532  * ability, based on a set of hierarchical rules. When several
533  * devices are operating simultaneously, disconnects are usually
534  * an advantage. In a single device system, or if only 1 device
535  * is being accessed, transfers usually go faster if disconnects
536  * are not allowed:
537  *
538  * + Commands should NEVER disconnect if hostdata->disconnect =
539  *   DIS_NEVER (this holds for tape drives also), and ALWAYS
540  *   disconnect if hostdata->disconnect = DIS_ALWAYS.
541  * + Tape drive commands should always be allowed to disconnect.
542  * + Disconnect should be allowed if disconnected_Q isn't empty.
543  * + Commands should NOT disconnect if input_Q is empty.
544  * + Disconnect should be allowed if there are commands in input_Q
545  *   for a different target/lun. In this case, the other commands
546  *   should be made disconnect-able, if not already.
547  *
548  * I know, I know - this code would flunk me out of any
549  * "C Programming 101" class ever offered. But it's easy
550  * to change around and experiment with for now.
551  */
552
553         cmd->SCp.phase = 0;     /* assume no disconnect */
554         if (hostdata->disconnect == DIS_NEVER)
555                 goto no;
556         if (hostdata->disconnect == DIS_ALWAYS)
557                 goto yes;
558         if (cmd->device->type == 1)     /* tape drive? */
559                 goto yes;
560         if (hostdata->disconnected_Q)   /* other commands disconnected? */
561                 goto yes;
562         if (!(hostdata->input_Q))       /* input_Q empty? */
563                 goto no;
564         for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;
565              prev = (struct scsi_cmnd *) prev->host_scribble) {
566                 if ((prev->device->id != cmd->device->id) ||
567                     (prev->device->lun != cmd->device->lun)) {
568                         for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;
569                              prev = (struct scsi_cmnd *) prev->host_scribble)
570                                 prev->SCp.phase = 1;
571                         goto yes;
572                 }
573         }
574
575         goto no;
576
577  yes:
578         cmd->SCp.phase = 1;
579
580 #ifdef PROC_STATISTICS
581         hostdata->disc_allowed_cnt[cmd->device->id]++;
582 #endif
583
584  no:
585
586         write_wd33c93(regs, WD_SOURCE_ID, ((cmd->SCp.phase) ? SRCID_ER : 0));
587
588         write_wd33c93(regs, WD_TARGET_LUN, (u8)cmd->device->lun);
589         write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
590                       hostdata->sync_xfer[cmd->device->id]);
591         hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF));
592
593         if ((hostdata->level2 == L2_NONE) ||
594             (hostdata->sync_stat[cmd->device->id] == SS_UNSET)) {
595
596                 /*
597                  * Do a 'Select-With-ATN' command. This will end with
598                  * one of the following interrupts:
599                  *    CSR_RESEL_AM:  failure - can try again later.
600                  *    CSR_TIMEOUT:   failure - give up.
601                  *    CSR_SELECT:    success - proceed.
602                  */
603
604                 hostdata->selecting = cmd;
605
606 /* Every target has its own synchronous transfer setting, kept in the
607  * sync_xfer array, and a corresponding status byte in sync_stat[].
608  * Each target's sync_stat[] entry is initialized to SX_UNSET, and its
609  * sync_xfer[] entry is initialized to the default/safe value. SS_UNSET
610  * means that the parameters are undetermined as yet, and that we
611  * need to send an SDTR message to this device after selection is
612  * complete: We set SS_FIRST to tell the interrupt routine to do so.
613  * If we've been asked not to try synchronous transfers on this
614  * target (and _all_ luns within it), we'll still send the SDTR message
615  * later, but at that time we'll negotiate for async by specifying a
616  * sync fifo depth of 0.
617  */
618                 if (hostdata->sync_stat[cmd->device->id] == SS_UNSET)
619                         hostdata->sync_stat[cmd->device->id] = SS_FIRST;
620                 hostdata->state = S_SELECTING;
621                 write_wd33c93_count(regs, 0);   /* guarantee a DATA_PHASE interrupt */
622                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN);
623         } else {
624
625                 /*
626                  * Do a 'Select-With-ATN-Xfer' command. This will end with
627                  * one of the following interrupts:
628                  *    CSR_RESEL_AM:  failure - can try again later.
629                  *    CSR_TIMEOUT:   failure - give up.
630                  *    anything else: success - proceed.
631                  */
632
633                 hostdata->connected = cmd;
634                 write_wd33c93(regs, WD_COMMAND_PHASE, 0);
635
636                 /* copy command_descriptor_block into WD chip
637                  * (take advantage of auto-incrementing)
638                  */
639
640                 write_wd33c93_cdb(regs, cmd->cmd_len, cmd->cmnd);
641
642                 /* The wd33c93 only knows about Group 0, 1, and 5 commands when
643                  * it's doing a 'select-and-transfer'. To be safe, we write the
644                  * size of the CDB into the OWN_ID register for every case. This
645                  * way there won't be problems with vendor-unique, audio, etc.
646                  */
647
648                 write_wd33c93(regs, WD_OWN_ID, cmd->cmd_len);
649
650                 /* When doing a non-disconnect command with DMA, we can save
651                  * ourselves a DATA phase interrupt later by setting everything
652                  * up ahead of time.
653                  */
654
655                 if ((cmd->SCp.phase == 0) && (hostdata->no_dma == 0)) {
656                         if (hostdata->dma_setup(cmd,
657                             (cmd->sc_data_direction == DMA_TO_DEVICE) ?
658                              DATA_OUT_DIR : DATA_IN_DIR))
659                                 write_wd33c93_count(regs, 0);   /* guarantee a DATA_PHASE interrupt */
660                         else {
661                                 write_wd33c93_count(regs,
662                                                     cmd->SCp.this_residual);
663                                 write_wd33c93(regs, WD_CONTROL,
664                                               CTRL_IDI | CTRL_EDI | hostdata->dma_mode);
665                                 hostdata->dma = D_DMA_RUNNING;
666                         }
667                 } else
668                         write_wd33c93_count(regs, 0);   /* guarantee a DATA_PHASE interrupt */
669
670                 hostdata->state = S_RUNNING_LEVEL2;
671                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
672         }
673
674         /*
675          * Since the SCSI bus can handle only 1 connection at a time,
676          * we get out of here now. If the selection fails, or when
677          * the command disconnects, we'll come back to this routine
678          * to search the input_Q again...
679          */
680
681         DB(DB_EXECUTE,
682            printk("%s)EX-2 ", (cmd->SCp.phase) ? "d:" : ""))
683 }
684
685 static void
686 transfer_pio(const wd33c93_regs regs, uchar * buf, int cnt,
687              int data_in_dir, struct WD33C93_hostdata *hostdata)
688 {
689         uchar asr;
690
691         DB(DB_TRANSFER,
692            printk("(%p,%d,%s:", buf, cnt, data_in_dir ? "in" : "out"))
693
694         write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
695         write_wd33c93_count(regs, cnt);
696         write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
697         if (data_in_dir) {
698                 do {
699                         asr = read_aux_stat(regs);
700                         if (asr & ASR_DBR)
701                                 *buf++ = read_wd33c93(regs, WD_DATA);
702                 } while (!(asr & ASR_INT));
703         } else {
704                 do {
705                         asr = read_aux_stat(regs);
706                         if (asr & ASR_DBR)
707                                 write_wd33c93(regs, WD_DATA, *buf++);
708                 } while (!(asr & ASR_INT));
709         }
710
711         /* Note: we are returning with the interrupt UN-cleared.
712          * Since (presumably) an entire I/O operation has
713          * completed, the bus phase is probably different, and
714          * the interrupt routine will discover this when it
715          * responds to the uncleared int.
716          */
717
718 }
719
720 static void
721 transfer_bytes(const wd33c93_regs regs, struct scsi_cmnd *cmd,
722                 int data_in_dir)
723 {
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 (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
738                 cmd->SCp.buffer = sg_next(cmd->SCp.buffer);
739                 --cmd->SCp.buffers_residual;
740                 cmd->SCp.this_residual = cmd->SCp.buffer->length;
741                 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
742         }
743         if (!cmd->SCp.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 *) cmd->SCp.ptr,
758                              cmd->SCp.this_residual, data_in_dir, hostdata);
759                 length = cmd->SCp.this_residual;
760                 cmd->SCp.this_residual = read_wd33c93_count(regs);
761                 cmd->SCp.ptr += (length - cmd->SCp.this_residual);
762         }
763
764 /* We are able to do DMA (in fact, the Amiga hardware is
765  * already going!), so start up the wd33c93 in DMA mode.
766  * We set 'hostdata->dma' = D_DMA_RUNNING so that when the
767  * transfer completes and causes an interrupt, we're
768  * reminded to tell the Amiga to shut down its end. We'll
769  * postpone the updating of 'this_residual' and 'ptr'
770  * until then.
771  */
772
773         else {
774 #ifdef PROC_STATISTICS
775                 hostdata->dma_cnt++;
776 #endif
777                 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | hostdata->dma_mode);
778                 write_wd33c93_count(regs, cmd->SCp.this_residual);
779
780                 if ((hostdata->level2 >= L2_DATA) ||
781                     (hostdata->level2 == L2_BASIC && cmd->SCp.phase == 0)) {
782                         write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
783                         write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
784                         hostdata->state = S_RUNNING_LEVEL2;
785                 } else
786                         write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
787
788                 hostdata->dma = D_DMA_RUNNING;
789         }
790 }
791
792 void
793 wd33c93_intr(struct Scsi_Host *instance)
794 {
795         struct WD33C93_hostdata *hostdata =
796             (struct WD33C93_hostdata *) instance->hostdata;
797         const wd33c93_regs regs = hostdata->regs;
798         struct scsi_cmnd *patch, *cmd;
799         uchar asr, sr, phs, id, lun, *ucp, msg;
800         unsigned long length, flags;
801
802         asr = read_aux_stat(regs);
803         if (!(asr & ASR_INT) || (asr & ASR_BSY))
804                 return;
805
806         spin_lock_irqsave(&hostdata->lock, flags);
807
808 #ifdef PROC_STATISTICS
809         hostdata->int_cnt++;
810 #endif
811
812         cmd = (struct scsi_cmnd *) hostdata->connected; /* assume we're connected */
813         sr = read_wd33c93(regs, WD_SCSI_STATUS);        /* clear the interrupt */
814         phs = read_wd33c93(regs, WD_COMMAND_PHASE);
815
816         DB(DB_INTR, printk("{%02x:%02x-", asr, sr))
817
818 /* After starting a DMA transfer, the next interrupt
819  * is guaranteed to be in response to completion of
820  * the transfer. Since the Amiga DMA hardware runs in
821  * in an open-ended fashion, it needs to be told when
822  * to stop; do that here if D_DMA_RUNNING is true.
823  * Also, we have to update 'this_residual' and 'ptr'
824  * based on the contents of the TRANSFER_COUNT register,
825  * in case the device decided to do an intermediate
826  * disconnect (a device may do this if it has to do a
827  * seek, or just to be nice and let other devices have
828  * some bus time during long transfers). After doing
829  * whatever is needed, we go on and service the WD3393
830  * interrupt normally.
831  */
832             if (hostdata->dma == D_DMA_RUNNING) {
833                 DB(DB_TRANSFER,
834                    printk("[%p/%d:", cmd->SCp.ptr, cmd->SCp.this_residual))
835                     hostdata->dma_stop(cmd->device->host, cmd, 1);
836                 hostdata->dma = D_DMA_OFF;
837                 length = cmd->SCp.this_residual;
838                 cmd->SCp.this_residual = read_wd33c93_count(regs);
839                 cmd->SCp.ptr += (length - cmd->SCp.this_residual);
840                 DB(DB_TRANSFER,
841                    printk("%p/%d]", cmd->SCp.ptr, cmd->SCp.this_residual))
842         }
843
844 /* Respond to the specific WD3393 interrupt - there are quite a few! */
845         switch (sr) {
846         case CSR_TIMEOUT:
847                 DB(DB_INTR, printk("TIMEOUT"))
848
849                     if (hostdata->state == S_RUNNING_LEVEL2)
850                         hostdata->connected = NULL;
851                 else {
852                         cmd = (struct scsi_cmnd *) hostdata->selecting; /* get a valid cmd */
853                         hostdata->selecting = NULL;
854                 }
855
856                 cmd->result = DID_NO_CONNECT << 16;
857                 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
858                 hostdata->state = S_UNCONNECTED;
859                 cmd->scsi_done(cmd);
860
861                 /* From esp.c:
862                  * There is a window of time within the scsi_done() path
863                  * of execution where interrupts are turned back on full
864                  * blast and left that way.  During that time we could
865                  * reconnect to a disconnected command, then we'd bomb
866                  * out below.  We could also end up executing two commands
867                  * at _once_.  ...just so you know why the restore_flags()
868                  * is here...
869                  */
870
871                 spin_unlock_irqrestore(&hostdata->lock, flags);
872
873 /* We are not connected to a target - check to see if there
874  * are commands waiting to be executed.
875  */
876
877                 wd33c93_execute(instance);
878                 break;
879
880 /* Note: this interrupt should not occur in a LEVEL2 command */
881
882         case CSR_SELECT:
883                 DB(DB_INTR, printk("SELECT"))
884                     hostdata->connected = cmd =
885                     (struct scsi_cmnd *) hostdata->selecting;
886                 hostdata->selecting = NULL;
887
888                 /* construct an IDENTIFY message with correct disconnect bit */
889
890                 hostdata->outgoing_msg[0] = IDENTIFY(0, cmd->device->lun);
891                 if (cmd->SCp.phase)
892                         hostdata->outgoing_msg[0] |= 0x40;
893
894                 if (hostdata->sync_stat[cmd->device->id] == SS_FIRST) {
895
896                         hostdata->sync_stat[cmd->device->id] = SS_WAITING;
897
898 /* Tack on a 2nd message to ask about synchronous transfers. If we've
899  * been asked to do only asynchronous transfers on this device, we
900  * request a fifo depth of 0, which is equivalent to async - should
901  * solve the problems some people have had with GVP's Guru ROM.
902  */
903
904                         hostdata->outgoing_msg[1] = EXTENDED_MESSAGE;
905                         hostdata->outgoing_msg[2] = 3;
906                         hostdata->outgoing_msg[3] = EXTENDED_SDTR;
907                         if (hostdata->no_sync & (1 << cmd->device->id)) {
908                                 calc_sync_msg(hostdata->default_sx_per, 0,
909                                                 0, hostdata->outgoing_msg + 4);
910                         } else {
911                                 calc_sync_msg(optimum_sx_per(hostdata),
912                                                 OPTIMUM_SX_OFF,
913                                                 hostdata->fast,
914                                                 hostdata->outgoing_msg + 4);
915                         }
916                         hostdata->outgoing_len = 6;
917 #ifdef SYNC_DEBUG
918                         ucp = hostdata->outgoing_msg + 1;
919                         printk(" sending SDTR %02x03%02x%02x%02x ",
920                                 ucp[0], ucp[2], ucp[3], ucp[4]);
921 #endif
922                 } else
923                         hostdata->outgoing_len = 1;
924
925                 hostdata->state = S_CONNECTED;
926                 spin_unlock_irqrestore(&hostdata->lock, flags);
927                 break;
928
929         case CSR_XFER_DONE | PHS_DATA_IN:
930         case CSR_UNEXP | PHS_DATA_IN:
931         case CSR_SRV_REQ | PHS_DATA_IN:
932                 DB(DB_INTR,
933                    printk("IN-%d.%d", cmd->SCp.this_residual,
934                           cmd->SCp.buffers_residual))
935                     transfer_bytes(regs, cmd, DATA_IN_DIR);
936                 if (hostdata->state != S_RUNNING_LEVEL2)
937                         hostdata->state = S_CONNECTED;
938                 spin_unlock_irqrestore(&hostdata->lock, flags);
939                 break;
940
941         case CSR_XFER_DONE | PHS_DATA_OUT:
942         case CSR_UNEXP | PHS_DATA_OUT:
943         case CSR_SRV_REQ | PHS_DATA_OUT:
944                 DB(DB_INTR,
945                    printk("OUT-%d.%d", cmd->SCp.this_residual,
946                           cmd->SCp.buffers_residual))
947                     transfer_bytes(regs, cmd, DATA_OUT_DIR);
948                 if (hostdata->state != S_RUNNING_LEVEL2)
949                         hostdata->state = S_CONNECTED;
950                 spin_unlock_irqrestore(&hostdata->lock, flags);
951                 break;
952
953 /* Note: this interrupt should not occur in a LEVEL2 command */
954
955         case CSR_XFER_DONE | PHS_COMMAND:
956         case CSR_UNEXP | PHS_COMMAND:
957         case CSR_SRV_REQ | PHS_COMMAND:
958                 DB(DB_INTR, printk("CMND-%02x", cmd->cmnd[0]))
959                     transfer_pio(regs, cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR,
960                                  hostdata);
961                 hostdata->state = S_CONNECTED;
962                 spin_unlock_irqrestore(&hostdata->lock, flags);
963                 break;
964
965         case CSR_XFER_DONE | PHS_STATUS:
966         case CSR_UNEXP | PHS_STATUS:
967         case CSR_SRV_REQ | PHS_STATUS:
968                 DB(DB_INTR, printk("STATUS="))
969                 cmd->SCp.Status = read_1_byte(regs);
970                 DB(DB_INTR, printk("%02x", cmd->SCp.Status))
971                     if (hostdata->level2 >= L2_BASIC) {
972                         sr = read_wd33c93(regs, WD_SCSI_STATUS);        /* clear interrupt */
973                         udelay(7);
974                         hostdata->state = S_RUNNING_LEVEL2;
975                         write_wd33c93(regs, WD_COMMAND_PHASE, 0x50);
976                         write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
977                 } else {
978                         hostdata->state = S_CONNECTED;
979                 }
980                 spin_unlock_irqrestore(&hostdata->lock, flags);
981                 break;
982
983         case CSR_XFER_DONE | PHS_MESS_IN:
984         case CSR_UNEXP | PHS_MESS_IN:
985         case CSR_SRV_REQ | PHS_MESS_IN:
986                 DB(DB_INTR, printk("MSG_IN="))
987
988                 msg = read_1_byte(regs);
989                 sr = read_wd33c93(regs, WD_SCSI_STATUS);        /* clear interrupt */
990                 udelay(7);
991
992                 hostdata->incoming_msg[hostdata->incoming_ptr] = msg;
993                 if (hostdata->incoming_msg[0] == EXTENDED_MESSAGE)
994                         msg = EXTENDED_MESSAGE;
995                 else
996                         hostdata->incoming_ptr = 0;
997
998                 cmd->SCp.Message = msg;
999                 switch (msg) {
1000
1001                 case COMMAND_COMPLETE:
1002                         DB(DB_INTR, printk("CCMP"))
1003                             write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1004                         hostdata->state = S_PRE_CMP_DISC;
1005                         break;
1006
1007                 case SAVE_POINTERS:
1008                         DB(DB_INTR, printk("SDP"))
1009                             write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1010                         hostdata->state = S_CONNECTED;
1011                         break;
1012
1013                 case RESTORE_POINTERS:
1014                         DB(DB_INTR, printk("RDP"))
1015                             if (hostdata->level2 >= L2_BASIC) {
1016                                 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
1017                                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1018                                 hostdata->state = S_RUNNING_LEVEL2;
1019                         } else {
1020                                 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1021                                 hostdata->state = S_CONNECTED;
1022                         }
1023                         break;
1024
1025                 case DISCONNECT:
1026                         DB(DB_INTR, printk("DIS"))
1027                             cmd->device->disconnect = 1;
1028                         write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1029                         hostdata->state = S_PRE_TMP_DISC;
1030                         break;
1031
1032                 case MESSAGE_REJECT:
1033                         DB(DB_INTR, printk("REJ"))
1034 #ifdef SYNC_DEBUG
1035                             printk("-REJ-");
1036 #endif
1037                         if (hostdata->sync_stat[cmd->device->id] == SS_WAITING) {
1038                                 hostdata->sync_stat[cmd->device->id] = SS_SET;
1039                                 /* we want default_sx_per, not DEFAULT_SX_PER */
1040                                 hostdata->sync_xfer[cmd->device->id] =
1041                                         calc_sync_xfer(hostdata->default_sx_per
1042                                                 / 4, 0, 0, hostdata->sx_table);
1043                         }
1044                         write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1045                         hostdata->state = S_CONNECTED;
1046                         break;
1047
1048                 case EXTENDED_MESSAGE:
1049                         DB(DB_INTR, printk("EXT"))
1050
1051                             ucp = hostdata->incoming_msg;
1052
1053 #ifdef SYNC_DEBUG
1054                         printk("%02x", ucp[hostdata->incoming_ptr]);
1055 #endif
1056                         /* Is this the last byte of the extended message? */
1057
1058                         if ((hostdata->incoming_ptr >= 2) &&
1059                             (hostdata->incoming_ptr == (ucp[1] + 1))) {
1060
1061                                 switch (ucp[2]) {       /* what's the EXTENDED code? */
1062                                 case EXTENDED_SDTR:
1063                                         /* default to default async period */
1064                                         id = calc_sync_xfer(hostdata->
1065                                                         default_sx_per / 4, 0,
1066                                                         0, hostdata->sx_table);
1067                                         if (hostdata->sync_stat[cmd->device->id] !=
1068                                             SS_WAITING) {
1069
1070 /* A device has sent an unsolicited SDTR message; rather than go
1071  * through the effort of decoding it and then figuring out what
1072  * our reply should be, we're just gonna say that we have a
1073  * synchronous fifo depth of 0. This will result in asynchronous
1074  * transfers - not ideal but so much easier.
1075  * Actually, this is OK because it assures us that if we don't
1076  * specifically ask for sync transfers, we won't do any.
1077  */
1078
1079                                                 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1080                                                 hostdata->outgoing_msg[0] =
1081                                                     EXTENDED_MESSAGE;
1082                                                 hostdata->outgoing_msg[1] = 3;
1083                                                 hostdata->outgoing_msg[2] =
1084                                                     EXTENDED_SDTR;
1085                                                 calc_sync_msg(hostdata->
1086                                                         default_sx_per, 0,
1087                                                         0, hostdata->outgoing_msg + 3);
1088                                                 hostdata->outgoing_len = 5;
1089                                         } else {
1090                                                 if (ucp[4]) /* well, sync transfer */
1091                                                         id = calc_sync_xfer(ucp[3], ucp[4],
1092                                                                         hostdata->fast,
1093                                                                         hostdata->sx_table);
1094                                                 else if (ucp[3]) /* very unlikely... */
1095                                                         id = calc_sync_xfer(ucp[3], ucp[4],
1096                                                                         0, hostdata->sx_table);
1097                                         }
1098                                         hostdata->sync_xfer[cmd->device->id] = id;
1099 #ifdef SYNC_DEBUG
1100                                         printk(" sync_xfer=%02x\n",
1101                                                hostdata->sync_xfer[cmd->device->id]);
1102 #endif
1103                                         hostdata->sync_stat[cmd->device->id] =
1104                                             SS_SET;
1105                                         write_wd33c93_cmd(regs,
1106                                                           WD_CMD_NEGATE_ACK);
1107                                         hostdata->state = S_CONNECTED;
1108                                         break;
1109                                 case EXTENDED_WDTR:
1110                                         write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1111                                         printk("sending WDTR ");
1112                                         hostdata->outgoing_msg[0] =
1113                                             EXTENDED_MESSAGE;
1114                                         hostdata->outgoing_msg[1] = 2;
1115                                         hostdata->outgoing_msg[2] =
1116                                             EXTENDED_WDTR;
1117                                         hostdata->outgoing_msg[3] = 0;  /* 8 bit transfer width */
1118                                         hostdata->outgoing_len = 4;
1119                                         write_wd33c93_cmd(regs,
1120                                                           WD_CMD_NEGATE_ACK);
1121                                         hostdata->state = S_CONNECTED;
1122                                         break;
1123                                 default:
1124                                         write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1125                                         printk
1126                                             ("Rejecting Unknown Extended Message(%02x). ",
1127                                              ucp[2]);
1128                                         hostdata->outgoing_msg[0] =
1129                                             MESSAGE_REJECT;
1130                                         hostdata->outgoing_len = 1;
1131                                         write_wd33c93_cmd(regs,
1132                                                           WD_CMD_NEGATE_ACK);
1133                                         hostdata->state = S_CONNECTED;
1134                                         break;
1135                                 }
1136                                 hostdata->incoming_ptr = 0;
1137                         }
1138
1139                         /* We need to read more MESS_IN bytes for the extended message */
1140
1141                         else {
1142                                 hostdata->incoming_ptr++;
1143                                 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1144                                 hostdata->state = S_CONNECTED;
1145                         }
1146                         break;
1147
1148                 default:
1149                         printk("Rejecting Unknown Message(%02x) ", msg);
1150                         write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);     /* want MESS_OUT */
1151                         hostdata->outgoing_msg[0] = MESSAGE_REJECT;
1152                         hostdata->outgoing_len = 1;
1153                         write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1154                         hostdata->state = S_CONNECTED;
1155                 }
1156                 spin_unlock_irqrestore(&hostdata->lock, flags);
1157                 break;
1158
1159 /* Note: this interrupt will occur only after a LEVEL2 command */
1160
1161         case CSR_SEL_XFER_DONE:
1162
1163 /* Make sure that reselection is enabled at this point - it may
1164  * have been turned off for the command that just completed.
1165  */
1166
1167                 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1168                 if (phs == 0x60) {
1169                         DB(DB_INTR, printk("SX-DONE"))
1170                             cmd->SCp.Message = COMMAND_COMPLETE;
1171                         lun = read_wd33c93(regs, WD_TARGET_LUN);
1172                         DB(DB_INTR, printk(":%d.%d", cmd->SCp.Status, lun))
1173                             hostdata->connected = NULL;
1174                         hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
1175                         hostdata->state = S_UNCONNECTED;
1176                         if (cmd->SCp.Status == ILLEGAL_STATUS_BYTE)
1177                                 cmd->SCp.Status = lun;
1178                         if (cmd->cmnd[0] == REQUEST_SENSE
1179                             && cmd->SCp.Status != GOOD)
1180                                 cmd->result =
1181                                     (cmd->
1182                                      result & 0x00ffff) | (DID_ERROR << 16);
1183                         else
1184                                 cmd->result =
1185                                     cmd->SCp.Status | (cmd->SCp.Message << 8);
1186                         cmd->scsi_done(cmd);
1187
1188 /* We are no longer  connected to a target - check to see if
1189  * there are commands waiting to be executed.
1190  */
1191                         spin_unlock_irqrestore(&hostdata->lock, flags);
1192                         wd33c93_execute(instance);
1193                 } else {
1194                         printk
1195                             ("%02x:%02x:%02x: Unknown SEL_XFER_DONE phase!!---",
1196                              asr, sr, phs);
1197                         spin_unlock_irqrestore(&hostdata->lock, flags);
1198                 }
1199                 break;
1200
1201 /* Note: this interrupt will occur only after a LEVEL2 command */
1202
1203         case CSR_SDP:
1204                 DB(DB_INTR, printk("SDP"))
1205                     hostdata->state = S_RUNNING_LEVEL2;
1206                 write_wd33c93(regs, WD_COMMAND_PHASE, 0x41);
1207                 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1208                 spin_unlock_irqrestore(&hostdata->lock, flags);
1209                 break;
1210
1211         case CSR_XFER_DONE | PHS_MESS_OUT:
1212         case CSR_UNEXP | PHS_MESS_OUT:
1213         case CSR_SRV_REQ | PHS_MESS_OUT:
1214                 DB(DB_INTR, printk("MSG_OUT="))
1215
1216 /* To get here, we've probably requested MESSAGE_OUT and have
1217  * already put the correct bytes in outgoing_msg[] and filled
1218  * in outgoing_len. We simply send them out to the SCSI bus.
1219  * Sometimes we get MESSAGE_OUT phase when we're not expecting
1220  * it - like when our SDTR message is rejected by a target. Some
1221  * targets send the REJECT before receiving all of the extended
1222  * message, and then seem to go back to MESSAGE_OUT for a byte
1223  * or two. Not sure why, or if I'm doing something wrong to
1224  * cause this to happen. Regardless, it seems that sending
1225  * NOP messages in these situations results in no harm and
1226  * makes everyone happy.
1227  */
1228                     if (hostdata->outgoing_len == 0) {
1229                         hostdata->outgoing_len = 1;
1230                         hostdata->outgoing_msg[0] = NOP;
1231                 }
1232                 transfer_pio(regs, hostdata->outgoing_msg,
1233                              hostdata->outgoing_len, DATA_OUT_DIR, hostdata);
1234                 DB(DB_INTR, printk("%02x", hostdata->outgoing_msg[0]))
1235                     hostdata->outgoing_len = 0;
1236                 hostdata->state = S_CONNECTED;
1237                 spin_unlock_irqrestore(&hostdata->lock, flags);
1238                 break;
1239
1240         case CSR_UNEXP_DISC:
1241
1242 /* I think I've seen this after a request-sense that was in response
1243  * to an error condition, but not sure. We certainly need to do
1244  * something when we get this interrupt - the question is 'what?'.
1245  * Let's think positively, and assume some command has finished
1246  * in a legal manner (like a command that provokes a request-sense),
1247  * so we treat it as a normal command-complete-disconnect.
1248  */
1249
1250 /* Make sure that reselection is enabled at this point - it may
1251  * have been turned off for the command that just completed.
1252  */
1253
1254                 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1255                 if (cmd == NULL) {
1256                         printk(" - Already disconnected! ");
1257                         hostdata->state = S_UNCONNECTED;
1258                         spin_unlock_irqrestore(&hostdata->lock, flags);
1259                         return;
1260                 }
1261                 DB(DB_INTR, printk("UNEXP_DISC"))
1262                     hostdata->connected = NULL;
1263                 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
1264                 hostdata->state = S_UNCONNECTED;
1265                 if (cmd->cmnd[0] == REQUEST_SENSE && cmd->SCp.Status != GOOD)
1266                         cmd->result =
1267                             (cmd->result & 0x00ffff) | (DID_ERROR << 16);
1268                 else
1269                         cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
1270                 cmd->scsi_done(cmd);
1271
1272 /* We are no longer connected to a target - check to see if
1273  * there are commands waiting to be executed.
1274  */
1275                 /* look above for comments on scsi_done() */
1276                 spin_unlock_irqrestore(&hostdata->lock, flags);
1277                 wd33c93_execute(instance);
1278                 break;
1279
1280         case CSR_DISC:
1281
1282 /* Make sure that reselection is enabled at this point - it may
1283  * have been turned off for the command that just completed.
1284  */
1285
1286                 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
1287                 DB(DB_INTR, printk("DISC"))
1288                     if (cmd == NULL) {
1289                         printk(" - Already disconnected! ");
1290                         hostdata->state = S_UNCONNECTED;
1291                 }
1292                 switch (hostdata->state) {
1293                 case S_PRE_CMP_DISC:
1294                         hostdata->connected = NULL;
1295                         hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
1296                         hostdata->state = S_UNCONNECTED;
1297                         DB(DB_INTR, printk(":%d", cmd->SCp.Status))
1298                             if (cmd->cmnd[0] == REQUEST_SENSE
1299                                 && cmd->SCp.Status != GOOD)
1300                                 cmd->result =
1301                                     (cmd->
1302                                      result & 0x00ffff) | (DID_ERROR << 16);
1303                         else
1304                                 cmd->result =
1305                                     cmd->SCp.Status | (cmd->SCp.Message << 8);
1306                         cmd->scsi_done(cmd);
1307                         break;
1308                 case S_PRE_TMP_DISC:
1309                 case S_RUNNING_LEVEL2:
1310                         cmd->host_scribble = (uchar *) hostdata->disconnected_Q;
1311                         hostdata->disconnected_Q = cmd;
1312                         hostdata->connected = NULL;
1313                         hostdata->state = S_UNCONNECTED;
1314
1315 #ifdef PROC_STATISTICS
1316                         hostdata->disc_done_cnt[cmd->device->id]++;
1317 #endif
1318
1319                         break;
1320                 default:
1321                         printk("*** Unexpected DISCONNECT interrupt! ***");
1322                         hostdata->state = S_UNCONNECTED;
1323                 }
1324
1325 /* We are no longer connected to a target - check to see if
1326  * there are commands waiting to be executed.
1327  */
1328                 spin_unlock_irqrestore(&hostdata->lock, flags);
1329                 wd33c93_execute(instance);
1330                 break;
1331
1332         case CSR_RESEL_AM:
1333         case CSR_RESEL:
1334                 DB(DB_INTR, printk("RESEL%s", sr == CSR_RESEL_AM ? "_AM" : ""))
1335
1336                     /* Old chips (pre -A ???) don't have advanced features and will
1337                      * generate CSR_RESEL.  In that case we have to extract the LUN the
1338                      * hard way (see below).
1339                      * First we have to make sure this reselection didn't
1340                      * happen during Arbitration/Selection of some other device.
1341                      * If yes, put losing command back on top of input_Q.
1342                      */
1343                     if (hostdata->level2 <= L2_NONE) {
1344
1345                         if (hostdata->selecting) {
1346                                 cmd = (struct scsi_cmnd *) hostdata->selecting;
1347                                 hostdata->selecting = NULL;
1348                                 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
1349                                 cmd->host_scribble =
1350                                     (uchar *) hostdata->input_Q;
1351                                 hostdata->input_Q = cmd;
1352                         }
1353                 }
1354
1355                 else {
1356
1357                         if (cmd) {
1358                                 if (phs == 0x00) {
1359                                         hostdata->busy[cmd->device->id] &=
1360                                                 ~(1 << (cmd->device->lun & 0xff));
1361                                         cmd->host_scribble =
1362                                             (uchar *) hostdata->input_Q;
1363                                         hostdata->input_Q = cmd;
1364                                 } else {
1365                                         printk
1366                                             ("---%02x:%02x:%02x-TROUBLE: Intrusive ReSelect!---",
1367                                              asr, sr, phs);
1368                                         while (1)
1369                                                 printk("\r");
1370                                 }
1371                         }
1372
1373                 }
1374
1375                 /* OK - find out which device reselected us. */
1376
1377                 id = read_wd33c93(regs, WD_SOURCE_ID);
1378                 id &= SRCID_MASK;
1379
1380                 /* and extract the lun from the ID message. (Note that we don't
1381                  * bother to check for a valid message here - I guess this is
1382                  * not the right way to go, but...)
1383                  */
1384
1385                 if (sr == CSR_RESEL_AM) {
1386                         lun = read_wd33c93(regs, WD_DATA);
1387                         if (hostdata->level2 < L2_RESELECT)
1388                                 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
1389                         lun &= 7;
1390                 } else {
1391                         /* Old chip; wait for msgin phase to pick up the LUN. */
1392                         for (lun = 255; lun; lun--) {
1393                                 if ((asr = read_aux_stat(regs)) & ASR_INT)
1394                                         break;
1395                                 udelay(10);
1396                         }
1397                         if (!(asr & ASR_INT)) {
1398                                 printk
1399                                     ("wd33c93: Reselected without IDENTIFY\n");
1400                                 lun = 0;
1401                         } else {
1402                                 /* Verify this is a change to MSG_IN and read the message */
1403                                 sr = read_wd33c93(regs, WD_SCSI_STATUS);
1404                                 udelay(7);
1405                                 if (sr == (CSR_ABORT | PHS_MESS_IN) ||
1406                                     sr == (CSR_UNEXP | PHS_MESS_IN) ||
1407                                     sr == (CSR_SRV_REQ | PHS_MESS_IN)) {
1408                                         /* Got MSG_IN, grab target LUN */
1409                                         lun = read_1_byte(regs);
1410                                         /* Now we expect a 'paused with ACK asserted' int.. */
1411                                         asr = read_aux_stat(regs);
1412                                         if (!(asr & ASR_INT)) {
1413                                                 udelay(10);
1414                                                 asr = read_aux_stat(regs);
1415                                                 if (!(asr & ASR_INT))
1416                                                         printk
1417                                                             ("wd33c93: No int after LUN on RESEL (%02x)\n",
1418                                                              asr);
1419                                         }
1420                                         sr = read_wd33c93(regs, WD_SCSI_STATUS);
1421                                         udelay(7);
1422                                         if (sr != CSR_MSGIN)
1423                                                 printk
1424                                                     ("wd33c93: Not paused with ACK on RESEL (%02x)\n",
1425                                                      sr);
1426                                         lun &= 7;
1427                                         write_wd33c93_cmd(regs,
1428                                                           WD_CMD_NEGATE_ACK);
1429                                 } else {
1430                                         printk
1431                                             ("wd33c93: Not MSG_IN on reselect (%02x)\n",
1432                                              sr);
1433                                         lun = 0;
1434                                 }
1435                         }
1436                 }
1437
1438                 /* Now we look for the command that's reconnecting. */
1439
1440                 cmd = (struct scsi_cmnd *) hostdata->disconnected_Q;
1441                 patch = NULL;
1442                 while (cmd) {
1443                         if (id == cmd->device->id && lun == (u8)cmd->device->lun)
1444                                 break;
1445                         patch = cmd;
1446                         cmd = (struct scsi_cmnd *) cmd->host_scribble;
1447                 }
1448
1449                 /* Hmm. Couldn't find a valid command.... What to do? */
1450
1451                 if (!cmd) {
1452                         printk
1453                             ("---TROUBLE: target %d.%d not in disconnect queue---",
1454                              id, (u8)lun);
1455                         spin_unlock_irqrestore(&hostdata->lock, flags);
1456                         return;
1457                 }
1458
1459                 /* Ok, found the command - now start it up again. */
1460
1461                 if (patch)
1462                         patch->host_scribble = cmd->host_scribble;
1463                 else
1464                         hostdata->disconnected_Q =
1465                             (struct scsi_cmnd *) cmd->host_scribble;
1466                 hostdata->connected = cmd;
1467
1468                 /* We don't need to worry about 'initialize_SCp()' or 'hostdata->busy[]'
1469                  * because these things are preserved over a disconnect.
1470                  * But we DO need to fix the DPD bit so it's correct for this command.
1471                  */
1472
1473                 if (cmd->sc_data_direction == DMA_TO_DEVICE)
1474                         write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);
1475                 else
1476                         write_wd33c93(regs, WD_DESTINATION_ID,
1477                                       cmd->device->id | DSTID_DPD);
1478                 if (hostdata->level2 >= L2_RESELECT) {
1479                         write_wd33c93_count(regs, 0);   /* we want a DATA_PHASE interrupt */
1480                         write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
1481                         write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
1482                         hostdata->state = S_RUNNING_LEVEL2;
1483                 } else
1484                         hostdata->state = S_CONNECTED;
1485
1486                     spin_unlock_irqrestore(&hostdata->lock, flags);
1487                 break;
1488
1489         default:
1490                 printk("--UNKNOWN INTERRUPT:%02x:%02x:%02x--", asr, sr, phs);
1491                 spin_unlock_irqrestore(&hostdata->lock, flags);
1492         }
1493
1494         DB(DB_INTR, printk("} "))
1495
1496 }
1497
1498 static void
1499 reset_wd33c93(struct Scsi_Host *instance)
1500 {
1501         struct WD33C93_hostdata *hostdata =
1502             (struct WD33C93_hostdata *) instance->hostdata;
1503         const wd33c93_regs regs = hostdata->regs;
1504         uchar sr;
1505
1506 #ifdef CONFIG_SGI_IP22
1507         {
1508                 int busycount = 0;
1509                 extern void sgiwd93_reset(unsigned long);
1510                 /* wait 'til the chip gets some time for us */
1511                 while ((read_aux_stat(regs) & ASR_BSY) && busycount++ < 100)
1512                         udelay (10);
1513         /*
1514          * there are scsi devices out there, which manage to lock up
1515          * the wd33c93 in a busy condition. In this state it won't
1516          * accept the reset command. The only way to solve this is to
1517          * give the chip a hardware reset (if possible). The code below
1518          * does this for the SGI Indy, where this is possible
1519          */
1520         /* still busy ? */
1521         if (read_aux_stat(regs) & ASR_BSY)
1522                 sgiwd93_reset(instance->base); /* yeah, give it the hard one */
1523         }
1524 #endif
1525
1526         write_wd33c93(regs, WD_OWN_ID, OWNID_EAF | OWNID_RAF |
1527                       instance->this_id | hostdata->clock_freq);
1528         write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1529         write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
1530                       calc_sync_xfer(hostdata->default_sx_per / 4,
1531                                      DEFAULT_SX_OFF, 0, hostdata->sx_table));
1532         write_wd33c93(regs, WD_COMMAND, WD_CMD_RESET);
1533
1534
1535 #ifdef CONFIG_MVME147_SCSI
1536         udelay(25);             /* The old wd33c93 on MVME147 needs this, at least */
1537 #endif
1538
1539         while (!(read_aux_stat(regs) & ASR_INT))
1540                 ;
1541         sr = read_wd33c93(regs, WD_SCSI_STATUS);
1542
1543         hostdata->microcode = read_wd33c93(regs, WD_CDB_1);
1544         if (sr == 0x00)
1545                 hostdata->chip = C_WD33C93;
1546         else if (sr == 0x01) {
1547                 write_wd33c93(regs, WD_QUEUE_TAG, 0xa5);        /* any random number */
1548                 sr = read_wd33c93(regs, WD_QUEUE_TAG);
1549                 if (sr == 0xa5) {
1550                         hostdata->chip = C_WD33C93B;
1551                         write_wd33c93(regs, WD_QUEUE_TAG, 0);
1552                 } else
1553                         hostdata->chip = C_WD33C93A;
1554         } else
1555                 hostdata->chip = C_UNKNOWN_CHIP;
1556
1557         if (hostdata->chip != C_WD33C93B)       /* Fast SCSI unavailable */
1558                 hostdata->fast = 0;
1559
1560         write_wd33c93(regs, WD_TIMEOUT_PERIOD, TIMEOUT_PERIOD_VALUE);
1561         write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1562 }
1563
1564 int
1565 wd33c93_host_reset(struct scsi_cmnd * SCpnt)
1566 {
1567         struct Scsi_Host *instance;
1568         struct WD33C93_hostdata *hostdata;
1569         int i;
1570
1571         instance = SCpnt->device->host;
1572         spin_lock_irq(instance->host_lock);
1573         hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1574
1575         printk("scsi%d: reset. ", instance->host_no);
1576         disable_irq(instance->irq);
1577
1578         hostdata->dma_stop(instance, NULL, 0);
1579         for (i = 0; i < 8; i++) {
1580                 hostdata->busy[i] = 0;
1581                 hostdata->sync_xfer[i] =
1582                         calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF,
1583                                         0, hostdata->sx_table);
1584                 hostdata->sync_stat[i] = SS_UNSET;      /* using default sync values */
1585         }
1586         hostdata->input_Q = NULL;
1587         hostdata->selecting = NULL;
1588         hostdata->connected = NULL;
1589         hostdata->disconnected_Q = NULL;
1590         hostdata->state = S_UNCONNECTED;
1591         hostdata->dma = D_DMA_OFF;
1592         hostdata->incoming_ptr = 0;
1593         hostdata->outgoing_len = 0;
1594
1595         reset_wd33c93(instance);
1596         SCpnt->result = DID_RESET << 16;
1597         enable_irq(instance->irq);
1598         spin_unlock_irq(instance->host_lock);
1599         return SUCCESS;
1600 }
1601
1602 int
1603 wd33c93_abort(struct scsi_cmnd * cmd)
1604 {
1605         struct Scsi_Host *instance;
1606         struct WD33C93_hostdata *hostdata;
1607         wd33c93_regs regs;
1608         struct scsi_cmnd *tmp, *prev;
1609
1610         disable_irq(cmd->device->host->irq);
1611
1612         instance = cmd->device->host;
1613         hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1614         regs = hostdata->regs;
1615
1616 /*
1617  * Case 1 : If the command hasn't been issued yet, we simply remove it
1618  *     from the input_Q.
1619  */
1620
1621         tmp = (struct scsi_cmnd *) hostdata->input_Q;
1622         prev = NULL;
1623         while (tmp) {
1624                 if (tmp == cmd) {
1625                         if (prev)
1626                                 prev->host_scribble = cmd->host_scribble;
1627                         else
1628                                 hostdata->input_Q =
1629                                     (struct scsi_cmnd *) cmd->host_scribble;
1630                         cmd->host_scribble = NULL;
1631                         cmd->result = DID_ABORT << 16;
1632                         printk
1633                             ("scsi%d: Abort - removing command from input_Q. ",
1634                              instance->host_no);
1635                         enable_irq(cmd->device->host->irq);
1636                         cmd->scsi_done(cmd);
1637                         return SUCCESS;
1638                 }
1639                 prev = tmp;
1640                 tmp = (struct scsi_cmnd *) tmp->host_scribble;
1641         }
1642
1643 /*
1644  * Case 2 : If the command is connected, we're going to fail the abort
1645  *     and let the high level SCSI driver retry at a later time or
1646  *     issue a reset.
1647  *
1648  *     Timeouts, and therefore aborted commands, will be highly unlikely
1649  *     and handling them cleanly in this situation would make the common
1650  *     case of noresets less efficient, and would pollute our code.  So,
1651  *     we fail.
1652  */
1653
1654         if (hostdata->connected == cmd) {
1655                 uchar sr, asr;
1656                 unsigned long timeout;
1657
1658                 printk("scsi%d: Aborting connected command - ",
1659                        instance->host_no);
1660
1661                 printk("stopping DMA - ");
1662                 if (hostdata->dma == D_DMA_RUNNING) {
1663                         hostdata->dma_stop(instance, cmd, 0);
1664                         hostdata->dma = D_DMA_OFF;
1665                 }
1666
1667                 printk("sending wd33c93 ABORT command - ");
1668                 write_wd33c93(regs, WD_CONTROL,
1669                               CTRL_IDI | CTRL_EDI | CTRL_POLLED);
1670                 write_wd33c93_cmd(regs, WD_CMD_ABORT);
1671
1672 /* Now we have to attempt to flush out the FIFO... */
1673
1674                 printk("flushing fifo - ");
1675                 timeout = 1000000;
1676                 do {
1677                         asr = read_aux_stat(regs);
1678                         if (asr & ASR_DBR)
1679                                 read_wd33c93(regs, WD_DATA);
1680                 } while (!(asr & ASR_INT) && timeout-- > 0);
1681                 sr = read_wd33c93(regs, WD_SCSI_STATUS);
1682                 printk
1683                     ("asr=%02x, sr=%02x, %ld bytes un-transferred (timeout=%ld) - ",
1684                      asr, sr, read_wd33c93_count(regs), timeout);
1685
1686                 /*
1687                  * Abort command processed.
1688                  * Still connected.
1689                  * We must disconnect.
1690                  */
1691
1692                 printk("sending wd33c93 DISCONNECT command - ");
1693                 write_wd33c93_cmd(regs, WD_CMD_DISCONNECT);
1694
1695                 timeout = 1000000;
1696                 asr = read_aux_stat(regs);
1697                 while ((asr & ASR_CIP) && timeout-- > 0)
1698                         asr = read_aux_stat(regs);
1699                 sr = read_wd33c93(regs, WD_SCSI_STATUS);
1700                 printk("asr=%02x, sr=%02x.", asr, sr);
1701
1702                 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
1703                 hostdata->connected = NULL;
1704                 hostdata->state = S_UNCONNECTED;
1705                 cmd->result = DID_ABORT << 16;
1706
1707 /*      sti();*/
1708                 wd33c93_execute(instance);
1709
1710                 enable_irq(cmd->device->host->irq);
1711                 cmd->scsi_done(cmd);
1712                 return SUCCESS;
1713         }
1714
1715 /*
1716  * Case 3: If the command is currently disconnected from the bus,
1717  * we're not going to expend much effort here: Let's just return
1718  * an ABORT_SNOOZE and hope for the best...
1719  */
1720
1721         tmp = (struct scsi_cmnd *) hostdata->disconnected_Q;
1722         while (tmp) {
1723                 if (tmp == cmd) {
1724                         printk
1725                             ("scsi%d: Abort - command found on disconnected_Q - ",
1726                              instance->host_no);
1727                         printk("Abort SNOOZE. ");
1728                         enable_irq(cmd->device->host->irq);
1729                         return FAILED;
1730                 }
1731                 tmp = (struct scsi_cmnd *) tmp->host_scribble;
1732         }
1733
1734 /*
1735  * Case 4 : If we reached this point, the command was not found in any of
1736  *     the queues.
1737  *
1738  * We probably reached this point because of an unlikely race condition
1739  * between the command completing successfully and the abortion code,
1740  * so we won't panic, but we will notify the user in case something really
1741  * broke.
1742  */
1743
1744 /*   sti();*/
1745         wd33c93_execute(instance);
1746
1747         enable_irq(cmd->device->host->irq);
1748         printk("scsi%d: warning : SCSI command probably completed successfully"
1749                "         before abortion. ", instance->host_no);
1750         return FAILED;
1751 }
1752
1753 #define MAX_WD33C93_HOSTS 4
1754 #define MAX_SETUP_ARGS ARRAY_SIZE(setup_args)
1755 #define SETUP_BUFFER_SIZE 200
1756 static char setup_buffer[SETUP_BUFFER_SIZE];
1757 static char setup_used[MAX_SETUP_ARGS];
1758 static int done_setup = 0;
1759
1760 static int
1761 wd33c93_setup(char *str)
1762 {
1763         int i;
1764         char *p1, *p2;
1765
1766         /* The kernel does some processing of the command-line before calling
1767          * this function: If it begins with any decimal or hex number arguments,
1768          * ints[0] = how many numbers found and ints[1] through [n] are the values
1769          * themselves. str points to where the non-numeric arguments (if any)
1770          * start: We do our own parsing of those. We construct synthetic 'nosync'
1771          * keywords out of numeric args (to maintain compatibility with older
1772          * versions) and then add the rest of the arguments.
1773          */
1774
1775         p1 = setup_buffer;
1776         *p1 = '\0';
1777         if (str)
1778                 strncpy(p1, str, SETUP_BUFFER_SIZE - strlen(setup_buffer));
1779         setup_buffer[SETUP_BUFFER_SIZE - 1] = '\0';
1780         p1 = setup_buffer;
1781         i = 0;
1782         while (*p1 && (i < MAX_SETUP_ARGS)) {
1783                 p2 = strchr(p1, ',');
1784                 if (p2) {
1785                         *p2 = '\0';
1786                         if (p1 != p2)
1787                                 setup_args[i] = p1;
1788                         p1 = p2 + 1;
1789                         i++;
1790                 } else {
1791                         setup_args[i] = p1;
1792                         break;
1793                 }
1794         }
1795         for (i = 0; i < MAX_SETUP_ARGS; i++)
1796                 setup_used[i] = 0;
1797         done_setup = 1;
1798
1799         return 1;
1800 }
1801 __setup("wd33c93=", wd33c93_setup);
1802
1803 /* check_setup_args() returns index if key found, 0 if not
1804  */
1805 static int
1806 check_setup_args(char *key, int *flags, int *val, char *buf)
1807 {
1808         int x;
1809         char *cp;
1810
1811         for (x = 0; x < MAX_SETUP_ARGS; x++) {
1812                 if (setup_used[x])
1813                         continue;
1814                 if (!strncmp(setup_args[x], key, strlen(key)))
1815                         break;
1816                 if (!strncmp(setup_args[x], "next", strlen("next")))
1817                         return 0;
1818         }
1819         if (x == MAX_SETUP_ARGS)
1820                 return 0;
1821         setup_used[x] = 1;
1822         cp = setup_args[x] + strlen(key);
1823         *val = -1;
1824         if (*cp != ':')
1825                 return ++x;
1826         cp++;
1827         if ((*cp >= '0') && (*cp <= '9')) {
1828                 *val = simple_strtoul(cp, NULL, 0);
1829         }
1830         return ++x;
1831 }
1832
1833 /*
1834  * Calculate internal data-transfer-clock cycle from input-clock
1835  * frequency (/MHz) and fill 'sx_table'.
1836  *
1837  * The original driver used to rely on a fixed sx_table, containing periods
1838  * for (only) the lower limits of the respective input-clock-frequency ranges
1839  * (8-10/12-15/16-20 MHz). Although it seems, that no problems occurred with
1840  * this setting so far, it might be desirable to adjust the transfer periods
1841  * closer to the really attached, possibly 25% higher, input-clock, since
1842  * - the wd33c93 may really use a significant shorter period, than it has
1843  *   negotiated (eg. thrashing the target, which expects 4/8MHz, with 5/10MHz
1844  *   instead).
1845  * - the wd33c93 may ask the target for a lower transfer rate, than the target
1846  *   is capable of (eg. negotiating for an assumed minimum of 252ns instead of
1847  *   possible 200ns, which indeed shows up in tests as an approx. 10% lower
1848  *   transfer rate).
1849  */
1850 static inline unsigned int
1851 round_4(unsigned int x)
1852 {
1853         switch (x & 3) {
1854                 case 1: --x;
1855                         break;
1856                 case 2: ++x;
1857                         fallthrough;
1858                 case 3: ++x;
1859         }
1860         return x;
1861 }
1862
1863 static void
1864 calc_sx_table(unsigned int mhz, struct sx_period sx_table[9])
1865 {
1866         unsigned int d, i;
1867         if (mhz < 11)
1868                 d = 2;  /* divisor for  8-10 MHz input-clock */
1869         else if (mhz < 16)
1870                 d = 3;  /* divisor for 12-15 MHz input-clock */
1871         else
1872                 d = 4;  /* divisor for 16-20 MHz input-clock */
1873
1874         d = (100000 * d) / 2 / mhz; /* 100 x DTCC / nanosec */
1875
1876         sx_table[0].period_ns = 1;
1877         sx_table[0].reg_value = 0x20;
1878         for (i = 1; i < 8; i++) {
1879                 sx_table[i].period_ns = round_4((i+1)*d / 100);
1880                 sx_table[i].reg_value = (i+1)*0x10;
1881         }
1882         sx_table[7].reg_value = 0;
1883         sx_table[8].period_ns = 0;
1884         sx_table[8].reg_value = 0;
1885 }
1886
1887 /*
1888  * check and, maybe, map an init- or "clock:"- argument.
1889  */
1890 static uchar
1891 set_clk_freq(int freq, int *mhz)
1892 {
1893         int x = freq;
1894         if (WD33C93_FS_8_10 == freq)
1895                 freq = 8;
1896         else if (WD33C93_FS_12_15 == freq)
1897                 freq = 12;
1898         else if (WD33C93_FS_16_20 == freq)
1899                 freq = 16;
1900         else if (freq > 7 && freq < 11)
1901                 x = WD33C93_FS_8_10;
1902                 else if (freq > 11 && freq < 16)
1903                 x = WD33C93_FS_12_15;
1904                 else if (freq > 15 && freq < 21)
1905                 x = WD33C93_FS_16_20;
1906         else {
1907                         /* Hmm, wouldn't it be safer to assume highest freq here? */
1908                 x = WD33C93_FS_8_10;
1909                 freq = 8;
1910         }
1911         *mhz = freq;
1912         return x;
1913 }
1914
1915 /*
1916  * to be used with the resync: fast: ... options
1917  */
1918 static inline void set_resync ( struct WD33C93_hostdata *hd, int mask )
1919 {
1920         int i;
1921         for (i = 0; i < 8; i++)
1922                 if (mask & (1 << i))
1923                         hd->sync_stat[i] = SS_UNSET;
1924 }
1925
1926 void
1927 wd33c93_init(struct Scsi_Host *instance, const wd33c93_regs regs,
1928              dma_setup_t setup, dma_stop_t stop, int clock_freq)
1929 {
1930         struct WD33C93_hostdata *hostdata;
1931         int i;
1932         int flags;
1933         int val;
1934         char buf[32];
1935
1936         if (!done_setup && setup_strings)
1937                 wd33c93_setup(setup_strings);
1938
1939         hostdata = (struct WD33C93_hostdata *) instance->hostdata;
1940
1941         hostdata->regs = regs;
1942         hostdata->clock_freq = set_clk_freq(clock_freq, &i);
1943         calc_sx_table(i, hostdata->sx_table);
1944         hostdata->dma_setup = setup;
1945         hostdata->dma_stop = stop;
1946         hostdata->dma_bounce_buffer = NULL;
1947         hostdata->dma_bounce_len = 0;
1948         for (i = 0; i < 8; i++) {
1949                 hostdata->busy[i] = 0;
1950                 hostdata->sync_xfer[i] =
1951                         calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF,
1952                                         0, hostdata->sx_table);
1953                 hostdata->sync_stat[i] = SS_UNSET;      /* using default sync values */
1954 #ifdef PROC_STATISTICS
1955                 hostdata->cmd_cnt[i] = 0;
1956                 hostdata->disc_allowed_cnt[i] = 0;
1957                 hostdata->disc_done_cnt[i] = 0;
1958 #endif
1959         }
1960         hostdata->input_Q = NULL;
1961         hostdata->selecting = NULL;
1962         hostdata->connected = NULL;
1963         hostdata->disconnected_Q = NULL;
1964         hostdata->state = S_UNCONNECTED;
1965         hostdata->dma = D_DMA_OFF;
1966         hostdata->level2 = L2_BASIC;
1967         hostdata->disconnect = DIS_ADAPTIVE;
1968         hostdata->args = DEBUG_DEFAULTS;
1969         hostdata->incoming_ptr = 0;
1970         hostdata->outgoing_len = 0;
1971         hostdata->default_sx_per = DEFAULT_SX_PER;
1972         hostdata->no_dma = 0;   /* default is DMA enabled */
1973
1974 #ifdef PROC_INTERFACE
1975         hostdata->proc = PR_VERSION | PR_INFO | PR_STATISTICS |
1976             PR_CONNECTED | PR_INPUTQ | PR_DISCQ | PR_STOP;
1977 #ifdef PROC_STATISTICS
1978         hostdata->dma_cnt = 0;
1979         hostdata->pio_cnt = 0;
1980         hostdata->int_cnt = 0;
1981 #endif
1982 #endif
1983
1984         if (check_setup_args("clock", &flags, &val, buf)) {
1985                 hostdata->clock_freq = set_clk_freq(val, &val);
1986                 calc_sx_table(val, hostdata->sx_table);
1987         }
1988
1989         if (check_setup_args("nosync", &flags, &val, buf))
1990                 hostdata->no_sync = val;
1991
1992         if (check_setup_args("nodma", &flags, &val, buf))
1993                 hostdata->no_dma = (val == -1) ? 1 : val;
1994
1995         if (check_setup_args("period", &flags, &val, buf))
1996                 hostdata->default_sx_per =
1997                     hostdata->sx_table[round_period((unsigned int) val,
1998                                                     hostdata->sx_table)].period_ns;
1999
2000         if (check_setup_args("disconnect", &flags, &val, buf)) {
2001                 if ((val >= DIS_NEVER) && (val <= DIS_ALWAYS))
2002                         hostdata->disconnect = val;
2003                 else
2004                         hostdata->disconnect = DIS_ADAPTIVE;
2005         }
2006
2007         if (check_setup_args("level2", &flags, &val, buf))
2008                 hostdata->level2 = val;
2009
2010         if (check_setup_args("debug", &flags, &val, buf))
2011                 hostdata->args = val & DB_MASK;
2012
2013         if (check_setup_args("burst", &flags, &val, buf))
2014                 hostdata->dma_mode = val ? CTRL_BURST:CTRL_DMA;
2015
2016         if (WD33C93_FS_16_20 == hostdata->clock_freq /* divisor 4 */
2017                 && check_setup_args("fast", &flags, &val, buf))
2018                 hostdata->fast = !!val;
2019
2020         if ((i = check_setup_args("next", &flags, &val, buf))) {
2021                 while (i)
2022                         setup_used[--i] = 1;
2023         }
2024 #ifdef PROC_INTERFACE
2025         if (check_setup_args("proc", &flags, &val, buf))
2026                 hostdata->proc = val;
2027 #endif
2028
2029         spin_lock_irq(&hostdata->lock);
2030         reset_wd33c93(instance);
2031         spin_unlock_irq(&hostdata->lock);
2032
2033         printk("wd33c93-%d: chip=%s/%d no_sync=0x%x no_dma=%d",
2034                instance->host_no,
2035                (hostdata->chip == C_WD33C93) ? "WD33c93" : (hostdata->chip ==
2036                                                             C_WD33C93A) ?
2037                "WD33c93A" : (hostdata->chip ==
2038                              C_WD33C93B) ? "WD33c93B" : "unknown",
2039                hostdata->microcode, hostdata->no_sync, hostdata->no_dma);
2040 #ifdef DEBUGGING_ON
2041         printk(" debug_flags=0x%02x\n", hostdata->args);
2042 #else
2043         printk(" debugging=OFF\n");
2044 #endif
2045         printk("           setup_args=");
2046         for (i = 0; i < MAX_SETUP_ARGS; i++)
2047                 printk("%s,", setup_args[i]);
2048         printk("\n");
2049         printk("           Version %s - %s\n", WD33C93_VERSION, WD33C93_DATE);
2050 }
2051
2052 int wd33c93_write_info(struct Scsi_Host *instance, char *buf, int len)
2053 {
2054 #ifdef PROC_INTERFACE
2055         char *bp;
2056         struct WD33C93_hostdata *hd;
2057         int x;
2058
2059         hd = (struct WD33C93_hostdata *) instance->hostdata;
2060
2061 /* We accept the following
2062  * keywords (same format as command-line, but arguments are not optional):
2063  *    debug
2064  *    disconnect
2065  *    period
2066  *    resync
2067  *    proc
2068  *    nodma
2069  *    level2
2070  *    burst
2071  *    fast
2072  *    nosync
2073  */
2074
2075         buf[len] = '\0';
2076         for (bp = buf; *bp; ) {
2077                 while (',' == *bp || ' ' == *bp)
2078                         ++bp;
2079         if (!strncmp(bp, "debug:", 6)) {
2080                         hd->args = simple_strtoul(bp+6, &bp, 0) & DB_MASK;
2081         } else if (!strncmp(bp, "disconnect:", 11)) {
2082                         x = simple_strtoul(bp+11, &bp, 0);
2083                 if (x < DIS_NEVER || x > DIS_ALWAYS)
2084                         x = DIS_ADAPTIVE;
2085                 hd->disconnect = x;
2086         } else if (!strncmp(bp, "period:", 7)) {
2087                 x = simple_strtoul(bp+7, &bp, 0);
2088                 hd->default_sx_per =
2089                         hd->sx_table[round_period((unsigned int) x,
2090                                                   hd->sx_table)].period_ns;
2091         } else if (!strncmp(bp, "resync:", 7)) {
2092                         set_resync(hd, (int)simple_strtoul(bp+7, &bp, 0));
2093         } else if (!strncmp(bp, "proc:", 5)) {
2094                         hd->proc = simple_strtoul(bp+5, &bp, 0);
2095         } else if (!strncmp(bp, "nodma:", 6)) {
2096                         hd->no_dma = simple_strtoul(bp+6, &bp, 0);
2097         } else if (!strncmp(bp, "level2:", 7)) {
2098                         hd->level2 = simple_strtoul(bp+7, &bp, 0);
2099                 } else if (!strncmp(bp, "burst:", 6)) {
2100                         hd->dma_mode =
2101                                 simple_strtol(bp+6, &bp, 0) ? CTRL_BURST:CTRL_DMA;
2102                 } else if (!strncmp(bp, "fast:", 5)) {
2103                         x = !!simple_strtol(bp+5, &bp, 0);
2104                         if (x != hd->fast)
2105                                 set_resync(hd, 0xff);
2106                         hd->fast = x;
2107                 } else if (!strncmp(bp, "nosync:", 7)) {
2108                         x = simple_strtoul(bp+7, &bp, 0);
2109                         set_resync(hd, x ^ hd->no_sync);
2110                         hd->no_sync = x;
2111                 } else {
2112                         break; /* unknown keyword,syntax-error,... */
2113                 }
2114         }
2115         return len;
2116 #else
2117         return 0;
2118 #endif
2119 }
2120
2121 int
2122 wd33c93_show_info(struct seq_file *m, struct Scsi_Host *instance)
2123 {
2124 #ifdef PROC_INTERFACE
2125         struct WD33C93_hostdata *hd;
2126         struct scsi_cmnd *cmd;
2127         int x;
2128
2129         hd = (struct WD33C93_hostdata *) instance->hostdata;
2130
2131         spin_lock_irq(&hd->lock);
2132         if (hd->proc & PR_VERSION)
2133                 seq_printf(m, "\nVersion %s - %s.",
2134                         WD33C93_VERSION, WD33C93_DATE);
2135
2136         if (hd->proc & PR_INFO) {
2137                 seq_printf(m, "\nclock_freq=%02x no_sync=%02x no_dma=%d"
2138                         " dma_mode=%02x fast=%d",
2139                         hd->clock_freq, hd->no_sync, hd->no_dma, hd->dma_mode, hd->fast);
2140                 seq_puts(m, "\nsync_xfer[] =       ");
2141                 for (x = 0; x < 7; x++)
2142                         seq_printf(m, "\t%02x", hd->sync_xfer[x]);
2143                 seq_puts(m, "\nsync_stat[] =       ");
2144                 for (x = 0; x < 7; x++)
2145                         seq_printf(m, "\t%02x", hd->sync_stat[x]);
2146         }
2147 #ifdef PROC_STATISTICS
2148         if (hd->proc & PR_STATISTICS) {
2149                 seq_puts(m, "\ncommands issued:    ");
2150                 for (x = 0; x < 7; x++)
2151                         seq_printf(m, "\t%ld", hd->cmd_cnt[x]);
2152                 seq_puts(m, "\ndisconnects allowed:");
2153                 for (x = 0; x < 7; x++)
2154                         seq_printf(m, "\t%ld", hd->disc_allowed_cnt[x]);
2155                 seq_puts(m, "\ndisconnects done:   ");
2156                 for (x = 0; x < 7; x++)
2157                         seq_printf(m, "\t%ld", hd->disc_done_cnt[x]);
2158                 seq_printf(m,
2159                         "\ninterrupts: %ld, DATA_PHASE ints: %ld DMA, %ld PIO",
2160                         hd->int_cnt, hd->dma_cnt, hd->pio_cnt);
2161         }
2162 #endif
2163         if (hd->proc & PR_CONNECTED) {
2164                 seq_puts(m, "\nconnected:     ");
2165                 if (hd->connected) {
2166                         cmd = (struct scsi_cmnd *) hd->connected;
2167                         seq_printf(m, " %d:%llu(%02x)",
2168                                 cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2169                 }
2170         }
2171         if (hd->proc & PR_INPUTQ) {
2172                 seq_puts(m, "\ninput_Q:       ");
2173                 cmd = (struct scsi_cmnd *) hd->input_Q;
2174                 while (cmd) {
2175                         seq_printf(m, " %d:%llu(%02x)",
2176                                 cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2177                         cmd = (struct scsi_cmnd *) cmd->host_scribble;
2178                 }
2179         }
2180         if (hd->proc & PR_DISCQ) {
2181                 seq_puts(m, "\ndisconnected_Q:");
2182                 cmd = (struct scsi_cmnd *) hd->disconnected_Q;
2183                 while (cmd) {
2184                         seq_printf(m, " %d:%llu(%02x)",
2185                                 cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
2186                         cmd = (struct scsi_cmnd *) cmd->host_scribble;
2187                 }
2188         }
2189         seq_putc(m, '\n');
2190         spin_unlock_irq(&hd->lock);
2191 #endif                          /* PROC_INTERFACE */
2192         return 0;
2193 }
2194
2195 EXPORT_SYMBOL(wd33c93_host_reset);
2196 EXPORT_SYMBOL(wd33c93_init);
2197 EXPORT_SYMBOL(wd33c93_abort);
2198 EXPORT_SYMBOL(wd33c93_queuecommand);
2199 EXPORT_SYMBOL(wd33c93_intr);
2200 EXPORT_SYMBOL(wd33c93_show_info);
2201 EXPORT_SYMBOL(wd33c93_write_info);