5411e850c83366c8bfb6778ef3cad3d6b9559579
[linux-2.6.git] / drivers / scsi / arm / fas216.c
1 /*
2  *  linux/drivers/acorn/scsi/fas216.c
3  *
4  *  Copyright (C) 1997-2003 Russell King
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10  * Based on information in qlogicfas.c by Tom Zerucha, Michael Griffith, and
11  * other sources, including:
12  *   the AMD Am53CF94 data sheet
13  *   the AMD Am53C94 data sheet
14  *
15  * This is a generic driver.  To use it, have a look at cumana_2.c.  You
16  * should define your own structure that overlays FAS216_Info, eg:
17  * struct my_host_data {
18  *    FAS216_Info info;
19  *    ... my host specific data ...
20  * };
21  *
22  * Changelog:
23  *  30-08-1997  RMK     Created
24  *  14-09-1997  RMK     Started disconnect support
25  *  08-02-1998  RMK     Corrected real DMA support
26  *  15-02-1998  RMK     Started sync xfer support
27  *  06-04-1998  RMK     Tightened conditions for printing incomplete
28  *                      transfers
29  *  02-05-1998  RMK     Added extra checks in fas216_reset
30  *  24-05-1998  RMK     Fixed synchronous transfers with period >= 200ns
31  *  27-06-1998  RMK     Changed asm/delay.h to linux/delay.h
32  *  26-08-1998  RMK     Improved message support wrt MESSAGE_REJECT
33  *  02-04-2000  RMK     Converted to use the new error handling, and
34  *                      automatically request sense data upon check
35  *                      condition status from targets.
36  */
37 #include <linux/module.h>
38 #include <linux/blkdev.h>
39 #include <linux/kernel.h>
40 #include <linux/string.h>
41 #include <linux/ioport.h>
42 #include <linux/sched.h>
43 #include <linux/proc_fs.h>
44 #include <linux/delay.h>
45 #include <linux/bitops.h>
46 #include <linux/init.h>
47 #include <linux/interrupt.h>
48
49 #include <asm/dma.h>
50 #include <asm/io.h>
51 #include <asm/irq.h>
52 #include <asm/ecard.h>
53
54 #include "../scsi.h"
55 #include <scsi/scsi_host.h>
56 #include "fas216.h"
57 #include "scsi.h"
58
59 /* NOTE: SCSI2 Synchronous transfers *require* DMA according to
60  *  the data sheet.  This restriction is crazy, especially when
61  *  you only want to send 16 bytes!  What were the guys who
62  *  designed this chip on at that time?  Did they read the SCSI2
63  *  spec at all?  The following sections are taken from the SCSI2
64  *  standard (s2r10) concerning this:
65  *
66  * > IMPLEMENTORS NOTES:
67  * >   (1)  Re-negotiation at every selection is not recommended, since a
68  * >   significant performance impact is likely.
69  *
70  * >  The implied synchronous agreement shall remain in effect until a BUS DEVICE
71  * >  RESET message is received, until a hard reset condition occurs, or until one
72  * >  of the two SCSI devices elects to modify the agreement.  The default data
73  * >  transfer mode is asynchronous data transfer mode.  The default data transfer
74  * >  mode is entered at power on, after a BUS DEVICE RESET message, or after a hard
75  * >  reset condition.
76  *
77  *  In total, this means that once you have elected to use synchronous
78  *  transfers, you must always use DMA.
79  *
80  *  I was thinking that this was a good chip until I found this restriction ;(
81  */
82 #define SCSI2_SYNC
83 #undef  SCSI2_TAG
84
85 #undef DEBUG_CONNECT
86 #undef DEBUG_MESSAGES
87
88 #undef CHECK_STRUCTURE
89
90 #define LOG_CONNECT             (1 << 0)
91 #define LOG_BUSSERVICE          (1 << 1)
92 #define LOG_FUNCTIONDONE        (1 << 2)
93 #define LOG_MESSAGES            (1 << 3)
94 #define LOG_BUFFER              (1 << 4)
95 #define LOG_ERROR               (1 << 8)
96
97 static int level_mask = LOG_ERROR;
98
99 module_param(level_mask, int, 0644);
100
101 static int __init fas216_log_setup(char *str)
102 {
103         char *s;
104
105         level_mask = 0;
106
107         while ((s = strsep(&str, ",")) != NULL) {
108                 switch (s[0]) {
109                 case 'a':
110                         if (strcmp(s, "all") == 0)
111                                 level_mask |= -1;
112                         break;
113                 case 'b':
114                         if (strncmp(s, "bus", 3) == 0)
115                                 level_mask |= LOG_BUSSERVICE;
116                         if (strncmp(s, "buf", 3) == 0)
117                                 level_mask |= LOG_BUFFER;
118                         break;
119                 case 'c':
120                         level_mask |= LOG_CONNECT;
121                         break;
122                 case 'e':
123                         level_mask |= LOG_ERROR;
124                         break;
125                 case 'm':
126                         level_mask |= LOG_MESSAGES;
127                         break;
128                 case 'n':
129                         if (strcmp(s, "none") == 0)
130                                 level_mask = 0;
131                         break;
132                 case 's':
133                         level_mask |= LOG_FUNCTIONDONE;
134                         break;
135                 }
136         }
137         return 1;
138 }
139
140 __setup("fas216_logging=", fas216_log_setup);
141
142 static inline unsigned char fas216_readb(FAS216_Info *info, unsigned int reg)
143 {
144         unsigned int off = reg << info->scsi.io_shift;
145         return readb(info->scsi.io_base + off);
146 }
147
148 static inline void fas216_writeb(FAS216_Info *info, unsigned int reg, unsigned int val)
149 {
150         unsigned int off = reg << info->scsi.io_shift;
151         writeb(val, info->scsi.io_base + off);
152 }
153
154 static void fas216_dumpstate(FAS216_Info *info)
155 {
156         unsigned char is, stat, inst;
157
158         is   = fas216_readb(info, REG_IS);
159         stat = fas216_readb(info, REG_STAT);
160         inst = fas216_readb(info, REG_INST);
161         
162         printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X"
163                " INST=%02X IS=%02X CFIS=%02X",
164                 fas216_readb(info, REG_CTCL),
165                 fas216_readb(info, REG_CTCM),
166                 fas216_readb(info, REG_CMD),  stat, inst, is,
167                 fas216_readb(info, REG_CFIS));
168         printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n",
169                 fas216_readb(info, REG_CNTL1),
170                 fas216_readb(info, REG_CNTL2),
171                 fas216_readb(info, REG_CNTL3),
172                 fas216_readb(info, REG_CTCH));
173 }
174
175 static void print_SCp(Scsi_Pointer *SCp, const char *prefix, const char *suffix)
176 {
177         printk("%sptr %p this_residual 0x%x buffer %p buffers_residual 0x%x%s",
178                 prefix, SCp->ptr, SCp->this_residual, SCp->buffer,
179                 SCp->buffers_residual, suffix);
180 }
181
182 static void fas216_dumpinfo(FAS216_Info *info)
183 {
184         static int used = 0;
185         int i;
186
187         if (used++)
188                 return;
189
190         printk("FAS216_Info=\n");
191         printk("  { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p\n",
192                 info->magic_start, info->host, info->SCpnt,
193                 info->origSCpnt);
194         printk("    scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }\n",
195                 info->scsi.io_shift, info->scsi.irq,
196                 info->scsi.cfg[0], info->scsi.cfg[1], info->scsi.cfg[2],
197                 info->scsi.cfg[3]);
198         printk("           type=%p phase=%X\n",
199                 info->scsi.type, info->scsi.phase);
200         print_SCp(&info->scsi.SCp, "           SCp={ ", " }\n");
201         printk("      msgs async_stp=%X disconnectable=%d aborting=%d }\n",
202                 info->scsi.async_stp,
203                 info->scsi.disconnectable, info->scsi.aborting);
204         printk("    stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X\n"
205                "            disconnects=%X aborts=%X bus_resets=%X host_resets=%X}\n",
206                 info->stats.queues, info->stats.removes, info->stats.fins,
207                 info->stats.reads, info->stats.writes, info->stats.miscs,
208                 info->stats.disconnects, info->stats.aborts, info->stats.bus_resets,
209                 info->stats.host_resets);
210         printk("    ifcfg={ clockrate=%X select_timeout=%X asyncperiod=%X sync_max_depth=%X }\n",
211                 info->ifcfg.clockrate, info->ifcfg.select_timeout,
212                 info->ifcfg.asyncperiod, info->ifcfg.sync_max_depth);
213         for (i = 0; i < 8; i++) {
214                 printk("    busyluns[%d]=%08lx dev[%d]={ disconnect_ok=%d stp=%X sof=%X sync_state=%X }\n",
215                         i, info->busyluns[i], i,
216                         info->device[i].disconnect_ok, info->device[i].stp,
217                         info->device[i].sof, info->device[i].sync_state);
218         }
219         printk("    dma={ transfer_type=%X setup=%p pseudo=%p stop=%p }\n",
220                 info->dma.transfer_type, info->dma.setup,
221                 info->dma.pseudo, info->dma.stop);
222         printk("    internal_done=%X magic_end=%lX }\n",
223                 info->internal_done, info->magic_end);
224 }
225
226 #ifdef CHECK_STRUCTURE
227 static void __fas216_checkmagic(FAS216_Info *info, const char *func)
228 {
229         int corruption = 0;
230         if (info->magic_start != MAGIC) {
231                 printk(KERN_CRIT "FAS216 Error: magic at start corrupted\n");
232                 corruption++;
233         }
234         if (info->magic_end != MAGIC) {
235                 printk(KERN_CRIT "FAS216 Error: magic at end corrupted\n");
236                 corruption++;
237         }
238         if (corruption) {
239                 fas216_dumpinfo(info);
240                 panic("scsi memory space corrupted in %s", func);
241         }
242 }
243 #define fas216_checkmagic(info) __fas216_checkmagic((info), __FUNCTION__)
244 #else
245 #define fas216_checkmagic(info)
246 #endif
247
248 static const char *fas216_bus_phase(int stat)
249 {
250         static const char *phases[] = {
251                 "DATA OUT", "DATA IN",
252                 "COMMAND", "STATUS",
253                 "MISC OUT", "MISC IN",
254                 "MESG OUT", "MESG IN"
255         };
256
257         return phases[stat & STAT_BUSMASK];
258 }
259
260 static const char *fas216_drv_phase(FAS216_Info *info)
261 {
262         static const char *phases[] = {
263                 [PHASE_IDLE]            = "idle",
264                 [PHASE_SELECTION]       = "selection",
265                 [PHASE_COMMAND]         = "command",
266                 [PHASE_DATAOUT]         = "data out",
267                 [PHASE_DATAIN]          = "data in",
268                 [PHASE_MSGIN]           = "message in",
269                 [PHASE_MSGIN_DISCONNECT]= "disconnect",
270                 [PHASE_MSGOUT_EXPECT]   = "expect message out",
271                 [PHASE_MSGOUT]          = "message out",
272                 [PHASE_STATUS]          = "status",
273                 [PHASE_DONE]            = "done",
274         };
275
276         if (info->scsi.phase < ARRAY_SIZE(phases) &&
277             phases[info->scsi.phase])
278                 return phases[info->scsi.phase];
279         return "???";
280 }
281
282 static char fas216_target(FAS216_Info *info)
283 {
284         if (info->SCpnt)
285                 return '0' + info->SCpnt->device->id;
286         else
287                 return 'H';
288 }
289
290 static void
291 fas216_do_log(FAS216_Info *info, char target, char *fmt, va_list ap)
292 {
293         static char buf[1024];
294
295         vsnprintf(buf, sizeof(buf), fmt, ap);
296         printk("scsi%d.%c: %s", info->host->host_no, target, buf);
297 }
298
299 static void
300 fas216_log_command(FAS216_Info *info, int level, Scsi_Cmnd *SCpnt, char *fmt, ...)
301 {
302         va_list args;
303
304         if (level != 0 && !(level & level_mask))
305                 return;
306
307         va_start(args, fmt);
308         fas216_do_log(info, '0' + SCpnt->device->id, fmt, args);
309         va_end(args);
310
311         printk(" CDB: ");
312         print_command(SCpnt->cmnd);
313 }
314
315 static void
316 fas216_log_target(FAS216_Info *info, int level, int target, char *fmt, ...)
317 {
318         va_list args;
319
320         if (level != 0 && !(level & level_mask))
321                 return;
322
323         if (target < 0)
324                 target = 'H';
325         else
326                 target += '0';
327
328         va_start(args, fmt);
329         fas216_do_log(info, target, fmt, args);
330         va_end(args);
331
332         printk("\n");
333 }
334
335 static void fas216_log(FAS216_Info *info, int level, char *fmt, ...)
336 {
337         va_list args;
338
339         if (level != 0 && !(level & level_mask))
340                 return;
341
342         va_start(args, fmt);
343         fas216_do_log(info, fas216_target(info), fmt, args);
344         va_end(args);
345
346         printk("\n");
347 }
348
349 #define PH_SIZE 32
350
351 static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE];
352 static int ph_ptr;
353
354 static void add_debug_list(int stat, int ssr, int isr, int ph)
355 {
356         ph_list[ph_ptr].stat = stat;
357         ph_list[ph_ptr].ssr = ssr;
358         ph_list[ph_ptr].isr = isr;
359         ph_list[ph_ptr].ph = ph;
360
361         ph_ptr = (ph_ptr + 1) & (PH_SIZE-1);
362 }
363
364 static struct { int command; void *from; } cmd_list[8];
365 static int cmd_ptr;
366
367 static void fas216_cmd(FAS216_Info *info, unsigned int command)
368 {
369         cmd_list[cmd_ptr].command = command;
370         cmd_list[cmd_ptr].from = __builtin_return_address(0);
371
372         cmd_ptr = (cmd_ptr + 1) & 7;
373
374         fas216_writeb(info, REG_CMD, command);
375 }
376
377 static void print_debug_list(void)
378 {
379         int i;
380
381         i = ph_ptr;
382
383         printk(KERN_ERR "SCSI IRQ trail\n");
384         do {
385                 printk(" %02x:%02x:%02x:%1x",
386                         ph_list[i].stat, ph_list[i].ssr,
387                         ph_list[i].isr, ph_list[i].ph);
388                 i = (i + 1) & (PH_SIZE - 1);
389                 if (((i ^ ph_ptr) & 7) == 0)
390                         printk("\n");
391         } while (i != ph_ptr);
392         if ((i ^ ph_ptr) & 7)
393                 printk("\n");
394
395         i = cmd_ptr;
396         printk(KERN_ERR "FAS216 commands: ");
397         do {
398                 printk("%02x:%p ", cmd_list[i].command, cmd_list[i].from);
399                 i = (i + 1) & 7;
400         } while (i != cmd_ptr);
401         printk("\n");
402 }
403
404 static void fas216_done(FAS216_Info *info, unsigned int result);
405
406 /**
407  * fas216_get_last_msg - retrive last message from the list
408  * @info: interface to search
409  * @pos: current fifo position
410  *
411  * Retrieve a last message from the list, using position in fifo.
412  */
413 static inline unsigned short
414 fas216_get_last_msg(FAS216_Info *info, int pos)
415 {
416         unsigned short packed_msg = NOP;
417         struct message *msg;
418         int msgnr = 0;
419
420         while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
421                 if (pos >= msg->fifo)
422                         break;
423         }
424
425         if (msg) {
426                 if (msg->msg[0] == EXTENDED_MESSAGE)
427                         packed_msg = EXTENDED_MESSAGE | msg->msg[2] << 8;
428                 else
429                         packed_msg = msg->msg[0];
430         }
431
432         fas216_log(info, LOG_MESSAGES,
433                 "Message: %04x found at position %02x\n", packed_msg, pos);
434
435         return packed_msg;
436 }
437
438 /**
439  * fas216_syncperiod - calculate STP register value
440  * @info: state structure for interface connected to device
441  * @ns: period in ns (between subsequent bytes)
442  *
443  * Calculate value to be loaded into the STP register for a given period
444  * in ns. Returns a value suitable for REG_STP.
445  */
446 static int fas216_syncperiod(FAS216_Info *info, int ns)
447 {
448         int value = (info->ifcfg.clockrate * ns) / 1000;
449
450         fas216_checkmagic(info);
451
452         if (value < 4)
453                 value = 4;
454         else if (value > 35)
455                 value = 35;
456
457         return value & 31;
458 }
459
460 /**
461  * fas216_set_sync - setup FAS216 chip for specified transfer period.
462  * @info: state structure for interface connected to device
463  * @target: target
464  *
465  * Correctly setup FAS216 chip for specified transfer period.
466  * Notes   : we need to switch the chip out of FASTSCSI mode if we have
467  *           a transfer period >= 200ns - otherwise the chip will violate
468  *           the SCSI timings.
469  */
470 static void fas216_set_sync(FAS216_Info *info, int target)
471 {
472         unsigned int cntl3;
473
474         fas216_writeb(info, REG_SOF, info->device[target].sof);
475         fas216_writeb(info, REG_STP, info->device[target].stp);
476
477         cntl3 = info->scsi.cfg[2];
478         if (info->device[target].period >= (200 / 4))
479                 cntl3 = cntl3 & ~CNTL3_FASTSCSI;
480
481         fas216_writeb(info, REG_CNTL3, cntl3);
482 }
483
484 /* Synchronous transfer support
485  *
486  * Note: The SCSI II r10 spec says (5.6.12):
487  *
488  *  (2)  Due to historical problems with early host adapters that could
489  *  not accept an SDTR message, some targets may not initiate synchronous
490  *  negotiation after a power cycle as required by this standard.  Host
491  *  adapters that support synchronous mode may avoid the ensuing failure
492  *  modes when the target is independently power cycled by initiating a
493  *  synchronous negotiation on each REQUEST SENSE and INQUIRY command.
494  *  This approach increases the SCSI bus overhead and is not recommended
495  *  for new implementations.  The correct method is to respond to an
496  *  SDTR message with a MESSAGE REJECT message if the either the
497  *  initiator or target devices does not support synchronous transfers
498  *  or does not want to negotiate for synchronous transfers at the time.
499  *  Using the correct method assures compatibility with wide data
500  *  transfers and future enhancements.
501  *
502  * We will always initiate a synchronous transfer negotiation request on
503  * every INQUIRY or REQUEST SENSE message, unless the target itself has
504  * at some point performed a synchronous transfer negotiation request, or
505  * we have synchronous transfers disabled for this device.
506  */
507
508 /**
509  * fas216_handlesync - Handle a synchronous transfer message
510  * @info: state structure for interface
511  * @msg: message from target
512  *
513  * Handle a synchronous transfer message from the target
514  */
515 static void fas216_handlesync(FAS216_Info *info, char *msg)
516 {
517         struct fas216_device *dev = &info->device[info->SCpnt->device->id];
518         enum { sync, async, none, reject } res = none;
519
520 #ifdef SCSI2_SYNC
521         switch (msg[0]) {
522         case MESSAGE_REJECT:
523                 /* Synchronous transfer request failed.
524                  * Note: SCSI II r10:
525                  *
526                  *  SCSI devices that are capable of synchronous
527                  *  data transfers shall not respond to an SDTR
528                  *  message with a MESSAGE REJECT message.
529                  *
530                  * Hence, if we get this condition, we disable
531                  * negotiation for this device.
532                  */
533                 if (dev->sync_state == neg_inprogress) {
534                         dev->sync_state = neg_invalid;
535                         res = async;
536                 }
537                 break;
538
539         case EXTENDED_MESSAGE:
540                 switch (dev->sync_state) {
541                 /* We don't accept synchronous transfer requests.
542                  * Respond with a MESSAGE_REJECT to prevent a
543                  * synchronous transfer agreement from being reached.
544                  */
545                 case neg_invalid:
546                         res = reject;
547                         break;
548
549                 /* We were not negotiating a synchronous transfer,
550                  * but the device sent us a negotiation request.
551                  * Honour the request by sending back a SDTR
552                  * message containing our capability, limited by
553                  * the targets capability.
554                  */
555                 default:
556                         fas216_cmd(info, CMD_SETATN);
557                         if (msg[4] > info->ifcfg.sync_max_depth)
558                                 msg[4] = info->ifcfg.sync_max_depth;
559                         if (msg[3] < 1000 / info->ifcfg.clockrate)
560                                 msg[3] = 1000 / info->ifcfg.clockrate;
561
562                         msgqueue_flush(&info->scsi.msgs);
563                         msgqueue_addmsg(&info->scsi.msgs, 5,
564                                         EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
565                                         msg[3], msg[4]);
566                         info->scsi.phase = PHASE_MSGOUT_EXPECT;
567
568                         /* This is wrong.  The agreement is not in effect
569                          * until this message is accepted by the device
570                          */
571                         dev->sync_state = neg_targcomplete;
572                         res = sync;
573                         break;
574
575                 /* We initiated the synchronous transfer negotiation,
576                  * and have successfully received a response from the
577                  * target.  The synchronous transfer agreement has been
578                  * reached.  Note: if the values returned are out of our
579                  * bounds, we must reject the message.
580                  */
581                 case neg_inprogress:
582                         res = reject;
583                         if (msg[4] <= info->ifcfg.sync_max_depth &&
584                             msg[3] >= 1000 / info->ifcfg.clockrate) {
585                                 dev->sync_state = neg_complete;
586                                 res = sync;
587                         }
588                         break;
589                 }
590         }
591 #else
592         res = reject;
593 #endif
594
595         switch (res) {
596         case sync:
597                 dev->period = msg[3];
598                 dev->sof    = msg[4];
599                 dev->stp    = fas216_syncperiod(info, msg[3] * 4);
600                 fas216_set_sync(info, info->SCpnt->device->id);
601                 break;
602
603         case reject:
604                 fas216_cmd(info, CMD_SETATN);
605                 msgqueue_flush(&info->scsi.msgs);
606                 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
607                 info->scsi.phase = PHASE_MSGOUT_EXPECT;
608
609         case async:
610                 dev->period = info->ifcfg.asyncperiod / 4;
611                 dev->sof    = 0;
612                 dev->stp    = info->scsi.async_stp;
613                 fas216_set_sync(info, info->SCpnt->device->id);
614                 break;
615
616         case none:
617                 break;
618         }
619 }
620
621 /**
622  * fas216_updateptrs - update data pointers after transfer suspended/paused
623  * @info: interface's local pointer to update
624  * @bytes_transferred: number of bytes transferred
625  *
626  * Update data pointers after transfer suspended/paused
627  */
628 static void fas216_updateptrs(FAS216_Info *info, int bytes_transferred)
629 {
630         Scsi_Pointer *SCp = &info->scsi.SCp;
631
632         fas216_checkmagic(info);
633
634         BUG_ON(bytes_transferred < 0);
635
636         info->SCpnt->request_bufflen -= bytes_transferred;
637
638         while (bytes_transferred != 0) {
639                 if (SCp->this_residual > bytes_transferred)
640                         break;
641                 /*
642                  * We have used up this buffer.  Move on to the
643                  * next buffer.
644                  */
645                 bytes_transferred -= SCp->this_residual;
646                 if (!next_SCp(SCp) && bytes_transferred) {
647                         printk(KERN_WARNING "scsi%d.%c: out of buffers\n",
648                                 info->host->host_no, '0' + info->SCpnt->device->id);
649                         return;
650                 }
651         }
652
653         SCp->this_residual -= bytes_transferred;
654         if (SCp->this_residual)
655                 SCp->ptr += bytes_transferred;
656         else
657                 SCp->ptr = NULL;
658 }
659
660 /**
661  * fas216_pio - transfer data off of/on to card using programmed IO
662  * @info: interface to transfer data to/from
663  * @direction: direction to transfer data (DMA_OUT/DMA_IN)
664  *
665  * Transfer data off of/on to card using programmed IO.
666  * Notes: this is incredibly slow.
667  */
668 static void fas216_pio(FAS216_Info *info, fasdmadir_t direction)
669 {
670         Scsi_Pointer *SCp = &info->scsi.SCp;
671
672         fas216_checkmagic(info);
673
674         if (direction == DMA_OUT)
675                 fas216_writeb(info, REG_FF, get_next_SCp_byte(SCp));
676         else
677                 put_next_SCp_byte(SCp, fas216_readb(info, REG_FF));
678
679         if (SCp->this_residual == 0)
680                 next_SCp(SCp);
681 }
682
683 static void fas216_set_stc(FAS216_Info *info, unsigned int length)
684 {
685         fas216_writeb(info, REG_STCL, length);
686         fas216_writeb(info, REG_STCM, length >> 8);
687         fas216_writeb(info, REG_STCH, length >> 16);
688 }
689
690 static unsigned int fas216_get_ctc(FAS216_Info *info)
691 {
692         return fas216_readb(info, REG_CTCL) +
693                (fas216_readb(info, REG_CTCM) << 8) +
694                (fas216_readb(info, REG_CTCH) << 16);
695 }
696
697 /**
698  * fas216_cleanuptransfer - clean up after a transfer has completed.
699  * @info: interface to clean up
700  *
701  * Update the data pointers according to the number of bytes transferred
702  * on the SCSI bus.
703  */
704 static void fas216_cleanuptransfer(FAS216_Info *info)
705 {
706         unsigned long total, residual, fifo;
707         fasdmatype_t dmatype = info->dma.transfer_type;
708
709         info->dma.transfer_type = fasdma_none;
710
711         /*
712          * PIO transfers do not need to be cleaned up.
713          */
714         if (dmatype == fasdma_pio || dmatype == fasdma_none)
715                 return;
716
717         if (dmatype == fasdma_real_all)
718                 total = info->SCpnt->request_bufflen;
719         else
720                 total = info->scsi.SCp.this_residual;
721
722         residual = fas216_get_ctc(info);
723
724         fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
725
726         fas216_log(info, LOG_BUFFER, "cleaning up from previous "
727                    "transfer: length 0x%06x, residual 0x%x, fifo %d",
728                    total, residual, fifo);
729
730         /*
731          * If we were performing Data-Out, the transfer counter
732          * counts down each time a byte is transferred by the
733          * host to the FIFO.  This means we must include the
734          * bytes left in the FIFO from the transfer counter.
735          */
736         if (info->scsi.phase == PHASE_DATAOUT)
737                 residual += fifo;
738
739         fas216_updateptrs(info, total - residual);
740 }
741
742 /**
743  * fas216_transfer - Perform a DMA/PIO transfer off of/on to card
744  * @info: interface from which device disconnected from
745  *
746  * Start a DMA/PIO transfer off of/on to card
747  */
748 static void fas216_transfer(FAS216_Info *info)
749 {
750         fasdmadir_t direction;
751         fasdmatype_t dmatype;
752
753         fas216_log(info, LOG_BUFFER,
754                    "starttransfer: buffer %p length 0x%06x reqlen 0x%06x",
755                    info->scsi.SCp.ptr, info->scsi.SCp.this_residual,
756                    info->SCpnt->request_bufflen);
757
758         if (!info->scsi.SCp.ptr) {
759                 fas216_log(info, LOG_ERROR, "null buffer passed to "
760                            "fas216_starttransfer");
761                 print_SCp(&info->scsi.SCp, "SCp: ", "\n");
762                 print_SCp(&info->SCpnt->SCp, "Cmnd SCp: ", "\n");
763                 return;
764         }
765
766         /*
767          * If we have a synchronous transfer agreement in effect, we must
768          * use DMA mode.  If we are using asynchronous transfers, we may
769          * use DMA mode or PIO mode.
770          */
771         if (info->device[info->SCpnt->device->id].sof)
772                 dmatype = fasdma_real_all;
773         else
774                 dmatype = fasdma_pio;
775
776         if (info->scsi.phase == PHASE_DATAOUT)
777                 direction = DMA_OUT;
778         else
779                 direction = DMA_IN;
780
781         if (info->dma.setup)
782                 dmatype = info->dma.setup(info->host, &info->scsi.SCp,
783                                           direction, dmatype);
784         info->dma.transfer_type = dmatype;
785
786         if (dmatype == fasdma_real_all)
787                 fas216_set_stc(info, info->SCpnt->request_bufflen);
788         else
789                 fas216_set_stc(info, info->scsi.SCp.this_residual);
790
791         switch (dmatype) {
792         case fasdma_pio:
793                 fas216_log(info, LOG_BUFFER, "PIO transfer");
794                 fas216_writeb(info, REG_SOF, 0);
795                 fas216_writeb(info, REG_STP, info->scsi.async_stp);
796                 fas216_cmd(info, CMD_TRANSFERINFO);
797                 fas216_pio(info, direction);
798                 break;
799
800         case fasdma_pseudo:
801                 fas216_log(info, LOG_BUFFER, "pseudo transfer");
802                 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
803                 info->dma.pseudo(info->host, &info->scsi.SCp,
804                                  direction, info->SCpnt->transfersize);
805                 break;
806
807         case fasdma_real_block:
808                 fas216_log(info, LOG_BUFFER, "block dma transfer");
809                 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
810                 break;
811
812         case fasdma_real_all:
813                 fas216_log(info, LOG_BUFFER, "total dma transfer");
814                 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
815                 break;
816
817         default:
818                 fas216_log(info, LOG_BUFFER | LOG_ERROR,
819                            "invalid FAS216 DMA type");
820                 break;
821         }
822 }
823
824 /**
825  * fas216_stoptransfer - Stop a DMA transfer onto / off of the card
826  * @info: interface from which device disconnected from
827  *
828  * Called when we switch away from DATA IN or DATA OUT phases.
829  */
830 static void fas216_stoptransfer(FAS216_Info *info)
831 {
832         fas216_checkmagic(info);
833
834         if (info->dma.transfer_type == fasdma_real_all ||
835             info->dma.transfer_type == fasdma_real_block)
836                 info->dma.stop(info->host, &info->scsi.SCp);
837
838         fas216_cleanuptransfer(info);
839
840         if (info->scsi.phase == PHASE_DATAIN) {
841                 unsigned int fifo;
842
843                 /*
844                  * If we were performing Data-In, then the FIFO counter
845                  * contains the number of bytes not transferred via DMA
846                  * from the on-board FIFO.  Read them manually.
847                  */
848                 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
849                 while (fifo && info->scsi.SCp.ptr) {
850                         *info->scsi.SCp.ptr = fas216_readb(info, REG_FF);
851                         fas216_updateptrs(info, 1);
852                         fifo--;
853                 }
854         } else {
855                 /*
856                  * After a Data-Out phase, there may be unsent
857                  * bytes left in the FIFO.  Flush them out.
858                  */
859                 fas216_cmd(info, CMD_FLUSHFIFO);
860         }
861 }
862
863 static void fas216_aborttransfer(FAS216_Info *info)
864 {
865         fas216_checkmagic(info);
866
867         if (info->dma.transfer_type == fasdma_real_all ||
868             info->dma.transfer_type == fasdma_real_block)
869                 info->dma.stop(info->host, &info->scsi.SCp);
870
871         info->dma.transfer_type = fasdma_none;
872         fas216_cmd(info, CMD_FLUSHFIFO);
873 }
874
875 static void fas216_kick(FAS216_Info *info);
876
877 /**
878  * fas216_disconnected_intr - handle device disconnection
879  * @info: interface from which device disconnected from
880  *
881  * Handle device disconnection
882  */
883 static void fas216_disconnect_intr(FAS216_Info *info)
884 {
885         unsigned long flags;
886
887         fas216_checkmagic(info);
888
889         fas216_log(info, LOG_CONNECT, "disconnect phase=%02x",
890                    info->scsi.phase);
891
892         msgqueue_flush(&info->scsi.msgs);
893
894         switch (info->scsi.phase) {
895         case PHASE_SELECTION:                   /* while selecting - no target          */
896         case PHASE_SELSTEPS:
897                 fas216_done(info, DID_NO_CONNECT);
898                 break;
899
900         case PHASE_MSGIN_DISCONNECT:            /* message in - disconnecting           */
901                 info->scsi.disconnectable = 1;
902                 info->scsi.phase = PHASE_IDLE;
903                 info->stats.disconnects += 1;
904                 spin_lock_irqsave(&info->host_lock, flags);
905                 if (info->scsi.phase == PHASE_IDLE)
906                         fas216_kick(info);
907                 spin_unlock_irqrestore(&info->host_lock, flags);
908                 break;
909
910         case PHASE_DONE:                        /* at end of command - complete         */
911                 fas216_done(info, DID_OK);
912                 break;
913
914         case PHASE_MSGOUT:                      /* message out - possible ABORT message */
915                 if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) {
916                         info->scsi.aborting = 0;
917                         fas216_done(info, DID_ABORT);
918                         break;
919                 }
920
921         default:                                /* huh?                                 */
922                 printk(KERN_ERR "scsi%d.%c: unexpected disconnect in phase %s\n",
923                         info->host->host_no, fas216_target(info), fas216_drv_phase(info));
924                 print_debug_list();
925                 fas216_stoptransfer(info);
926                 fas216_done(info, DID_ERROR);
927                 break;
928         }
929 }
930
931 /**
932  * fas216_reselected_intr - start reconnection of a device
933  * @info: interface which was reselected
934  *
935  * Start reconnection of a device
936  */
937 static void
938 fas216_reselected_intr(FAS216_Info *info)
939 {
940         unsigned int cfis, i;
941         unsigned char msg[4];
942         unsigned char target, lun, tag;
943
944         fas216_checkmagic(info);
945
946         WARN_ON(info->scsi.phase == PHASE_SELECTION ||
947                 info->scsi.phase == PHASE_SELSTEPS);
948
949         cfis = fas216_readb(info, REG_CFIS);
950
951         fas216_log(info, LOG_CONNECT, "reconnect phase=%02x cfis=%02x",
952                    info->scsi.phase, cfis);
953
954         cfis &= CFIS_CF;
955
956         if (cfis < 2 || cfis > 4) {
957                 printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n",
958                         info->host->host_no);
959                 goto bad_message;
960         }
961
962         for (i = 0; i < cfis; i++)
963                 msg[i] = fas216_readb(info, REG_FF);
964
965         if (!(msg[0] & (1 << info->host->this_id)) ||
966             !(msg[1] & 0x80))
967                 goto initiator_error;
968
969         target = msg[0] & ~(1 << info->host->this_id);
970         target = ffs(target) - 1;
971         lun = msg[1] & 7;
972         tag = 0;
973
974         if (cfis >= 3) {
975                 if (msg[2] != SIMPLE_QUEUE_TAG)
976                         goto initiator_error;
977
978                 tag = msg[3];
979         }
980
981         /* set up for synchronous transfers */
982         fas216_writeb(info, REG_SDID, target);
983         fas216_set_sync(info, target);
984         msgqueue_flush(&info->scsi.msgs);
985
986         fas216_log(info, LOG_CONNECT, "Reconnected: target %1x lun %1x tag %02x",
987                    target, lun, tag);
988
989         if (info->scsi.disconnectable && info->SCpnt) {
990                 info->scsi.disconnectable = 0;
991                 if (info->SCpnt->device->id  == target &&
992                     info->SCpnt->device->lun == lun &&
993                     info->SCpnt->tag         == tag) {
994                         fas216_log(info, LOG_CONNECT, "reconnected previously executing command");
995                 } else {
996                         queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
997                         fas216_log(info, LOG_CONNECT, "had to move command to disconnected queue");
998                         info->SCpnt = NULL;
999                 }
1000         }
1001         if (!info->SCpnt) {
1002                 info->SCpnt = queue_remove_tgtluntag(&info->queues.disconnected,
1003                                         target, lun, tag);
1004                 fas216_log(info, LOG_CONNECT, "had to get command");
1005         }
1006
1007         if (info->SCpnt) {
1008                 /*
1009                  * Restore data pointer from SAVED data pointer
1010                  */
1011                 info->scsi.SCp = info->SCpnt->SCp;
1012
1013                 fas216_log(info, LOG_CONNECT, "data pointers: [%p, %X]",
1014                         info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1015                 info->scsi.phase = PHASE_MSGIN;
1016         } else {
1017                 /*
1018                  * Our command structure not found - abort the
1019                  * command on the target.  Since we have no
1020                  * record of this command, we can't send
1021                  * an INITIATOR DETECTED ERROR message.
1022                  */
1023                 fas216_cmd(info, CMD_SETATN);
1024
1025 #if 0
1026                 if (tag)
1027                         msgqueue_addmsg(&info->scsi.msgs, 2, ABORT_TAG, tag);
1028                 else
1029 #endif
1030                         msgqueue_addmsg(&info->scsi.msgs, 1, ABORT);
1031                 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1032                 info->scsi.aborting = 1;
1033         }
1034
1035         fas216_cmd(info, CMD_MSGACCEPTED);
1036         return;
1037
1038  initiator_error:
1039         printk(KERN_ERR "scsi%d.H: error during reselection: bytes",
1040                 info->host->host_no);
1041         for (i = 0; i < cfis; i++)
1042                 printk(" %02x", msg[i]);
1043         printk("\n");
1044  bad_message:
1045         fas216_cmd(info, CMD_SETATN);
1046         msgqueue_flush(&info->scsi.msgs);
1047         msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1048         info->scsi.phase = PHASE_MSGOUT_EXPECT;
1049         fas216_cmd(info, CMD_MSGACCEPTED);
1050 }
1051
1052 static void fas216_parse_message(FAS216_Info *info, unsigned char *message, int msglen)
1053 {
1054         int i;
1055
1056         switch (message[0]) {
1057         case COMMAND_COMPLETE:
1058                 if (msglen != 1)
1059                         goto unrecognised;
1060
1061                 printk(KERN_ERR "scsi%d.%c: command complete with no "
1062                         "status in MESSAGE_IN?\n",
1063                         info->host->host_no, fas216_target(info));
1064                 break;
1065
1066         case SAVE_POINTERS:
1067                 if (msglen != 1)
1068                         goto unrecognised;
1069
1070                 /*
1071                  * Save current data pointer to SAVED data pointer
1072                  * SCSI II standard says that we must not acknowledge
1073                  * this until we have really saved pointers.
1074                  * NOTE: we DO NOT save the command nor status pointers
1075                  * as required by the SCSI II standard.  These always
1076                  * point to the start of their respective areas.
1077                  */
1078                 info->SCpnt->SCp = info->scsi.SCp;
1079                 info->SCpnt->SCp.sent_command = 0;
1080                 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
1081                         "save data pointers: [%p, %X]",
1082                         info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1083                 break;
1084
1085         case RESTORE_POINTERS:
1086                 if (msglen != 1)
1087                         goto unrecognised;
1088
1089                 /*
1090                  * Restore current data pointer from SAVED data pointer
1091                  */
1092                 info->scsi.SCp = info->SCpnt->SCp;
1093                 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
1094                         "restore data pointers: [%p, 0x%x]",
1095                         info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1096                 break;
1097
1098         case DISCONNECT:
1099                 if (msglen != 1)
1100                         goto unrecognised;
1101
1102                 info->scsi.phase = PHASE_MSGIN_DISCONNECT;
1103                 break;
1104
1105         case MESSAGE_REJECT:
1106                 if (msglen != 1)
1107                         goto unrecognised;
1108
1109                 switch (fas216_get_last_msg(info, info->scsi.msgin_fifo)) {
1110                 case EXTENDED_MESSAGE | EXTENDED_SDTR << 8:
1111                         fas216_handlesync(info, message);
1112                         break;
1113
1114                 default:
1115                         fas216_log(info, 0, "reject, last message 0x%04x",
1116                                 fas216_get_last_msg(info, info->scsi.msgin_fifo));
1117                 }
1118                 break;
1119
1120         case NOP:
1121                 break;
1122
1123         case EXTENDED_MESSAGE:
1124                 if (msglen < 3)
1125                         goto unrecognised;
1126
1127                 switch (message[2]) {
1128                 case EXTENDED_SDTR:     /* Sync transfer negotiation request/reply */
1129                         fas216_handlesync(info, message);
1130                         break;
1131
1132                 default:
1133                         goto unrecognised;
1134                 }
1135                 break;
1136
1137         default:
1138                 goto unrecognised;
1139         }
1140         return;
1141
1142 unrecognised:
1143         fas216_log(info, 0, "unrecognised message, rejecting");
1144         printk("scsi%d.%c: message was", info->host->host_no, fas216_target(info));
1145         for (i = 0; i < msglen; i++)
1146                 printk("%s%02X", i & 31 ? " " : "\n  ", message[i]);
1147         printk("\n");
1148
1149         /*
1150          * Something strange seems to be happening here -
1151          * I can't use SETATN since the chip gives me an
1152          * invalid command interrupt when I do.  Weird.
1153          */
1154 fas216_cmd(info, CMD_NOP);
1155 fas216_dumpstate(info);
1156         fas216_cmd(info, CMD_SETATN);
1157         msgqueue_flush(&info->scsi.msgs);
1158         msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
1159         info->scsi.phase = PHASE_MSGOUT_EXPECT;
1160 fas216_dumpstate(info);
1161 }
1162
1163 static int fas216_wait_cmd(FAS216_Info *info, int cmd)
1164 {
1165         int tout;
1166         int stat;
1167
1168         fas216_cmd(info, cmd);
1169
1170         for (tout = 1000; tout; tout -= 1) {
1171                 stat = fas216_readb(info, REG_STAT);
1172                 if (stat & (STAT_INT|STAT_PARITYERROR))
1173                         break;
1174                 udelay(1);
1175         }
1176
1177         return stat;
1178 }
1179
1180 static int fas216_get_msg_byte(FAS216_Info *info)
1181 {
1182         unsigned int stat = fas216_wait_cmd(info, CMD_MSGACCEPTED);
1183
1184         if ((stat & STAT_INT) == 0)
1185                 goto timedout;
1186
1187         if ((stat & STAT_BUSMASK) != STAT_MESGIN)
1188                 goto unexpected_phase_change;
1189
1190         fas216_readb(info, REG_INST);
1191
1192         stat = fas216_wait_cmd(info, CMD_TRANSFERINFO);
1193
1194         if ((stat & STAT_INT) == 0)
1195                 goto timedout;
1196
1197         if (stat & STAT_PARITYERROR)
1198                 goto parity_error;
1199
1200         if ((stat & STAT_BUSMASK) != STAT_MESGIN)
1201                 goto unexpected_phase_change;
1202
1203         fas216_readb(info, REG_INST);
1204
1205         return fas216_readb(info, REG_FF);
1206
1207 timedout:
1208         fas216_log(info, LOG_ERROR, "timed out waiting for message byte");
1209         return -1;
1210
1211 unexpected_phase_change:
1212         fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat);
1213         return -2;
1214
1215 parity_error:
1216         fas216_log(info, LOG_ERROR, "parity error during message in phase");
1217         return -3;
1218 }
1219
1220 /**
1221  * fas216_message - handle a function done interrupt from FAS216 chip
1222  * @info: interface which caused function done interrupt
1223  *
1224  * Handle a function done interrupt from FAS216 chip
1225  */
1226 static void fas216_message(FAS216_Info *info)
1227 {
1228         unsigned char *message = info->scsi.message;
1229         unsigned int msglen = 1;
1230         int msgbyte = 0;
1231
1232         fas216_checkmagic(info);
1233
1234         message[0] = fas216_readb(info, REG_FF);
1235
1236         if (message[0] == EXTENDED_MESSAGE) {
1237                 msgbyte = fas216_get_msg_byte(info);
1238
1239                 if (msgbyte >= 0) {
1240                         message[1] = msgbyte;
1241
1242                         for (msglen = 2; msglen < message[1] + 2; msglen++) {
1243                                 msgbyte = fas216_get_msg_byte(info);
1244
1245                                 if (msgbyte >= 0)
1246                                         message[msglen] = msgbyte;
1247                                 else
1248                                         break;
1249                         }
1250                 }
1251         }
1252
1253         if (msgbyte == -3)
1254                 goto parity_error;
1255
1256 #ifdef DEBUG_MESSAGES
1257         {
1258                 int i;
1259
1260                 printk("scsi%d.%c: message in: ",
1261                         info->host->host_no, fas216_target(info));
1262                 for (i = 0; i < msglen; i++)
1263                         printk("%02X ", message[i]);
1264                 printk("\n");
1265         }
1266 #endif
1267
1268         fas216_parse_message(info, message, msglen);
1269         fas216_cmd(info, CMD_MSGACCEPTED);
1270         return;
1271
1272 parity_error:
1273         fas216_cmd(info, CMD_SETATN);
1274         msgqueue_flush(&info->scsi.msgs);
1275         msgqueue_addmsg(&info->scsi.msgs, 1, MSG_PARITY_ERROR);
1276         info->scsi.phase = PHASE_MSGOUT_EXPECT;
1277         fas216_cmd(info, CMD_MSGACCEPTED);
1278         return;
1279 }
1280
1281 /**
1282  * fas216_send_command - send command after all message bytes have been sent
1283  * @info: interface which caused bus service
1284  *
1285  * Send a command to a target after all message bytes have been sent
1286  */
1287 static void fas216_send_command(FAS216_Info *info)
1288 {
1289         int i;
1290
1291         fas216_checkmagic(info);
1292
1293         fas216_cmd(info, CMD_NOP|CMD_WITHDMA);
1294         fas216_cmd(info, CMD_FLUSHFIFO);
1295
1296         /* load command */
1297         for (i = info->scsi.SCp.sent_command; i < info->SCpnt->cmd_len; i++)
1298                 fas216_writeb(info, REG_FF, info->SCpnt->cmnd[i]);
1299
1300         fas216_cmd(info, CMD_TRANSFERINFO);
1301
1302         info->scsi.phase = PHASE_COMMAND;
1303 }
1304
1305 /**
1306  * fas216_send_messageout - handle bus service to send a message
1307  * @info: interface which caused bus service
1308  *
1309  * Handle bus service to send a message.
1310  * Note: We do not allow the device to change the data direction!
1311  */
1312 static void fas216_send_messageout(FAS216_Info *info, int start)
1313 {
1314         unsigned int tot_msglen = msgqueue_msglength(&info->scsi.msgs);
1315
1316         fas216_checkmagic(info);
1317
1318         fas216_cmd(info, CMD_FLUSHFIFO);
1319
1320         if (tot_msglen) {
1321                 struct message *msg;
1322                 int msgnr = 0;
1323
1324                 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1325                         int i;
1326
1327                         for (i = start; i < msg->length; i++)
1328                                 fas216_writeb(info, REG_FF, msg->msg[i]);
1329
1330                         msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
1331                         start = 0;
1332                 }
1333         } else
1334                 fas216_writeb(info, REG_FF, NOP);
1335
1336         fas216_cmd(info, CMD_TRANSFERINFO);
1337
1338         info->scsi.phase = PHASE_MSGOUT;
1339 }
1340
1341 /**
1342  * fas216_busservice_intr - handle bus service interrupt from FAS216 chip
1343  * @info: interface which caused bus service interrupt
1344  * @stat: Status register contents
1345  * @is: SCSI Status register contents
1346  *
1347  * Handle a bus service interrupt from FAS216 chip
1348  */
1349 static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
1350 {
1351         fas216_checkmagic(info);
1352
1353         fas216_log(info, LOG_BUSSERVICE,
1354                    "bus service: stat=%02x is=%02x phase=%02x",
1355                    stat, is, info->scsi.phase);
1356
1357         switch (info->scsi.phase) {
1358         case PHASE_SELECTION:
1359                 if ((is & IS_BITS) != IS_MSGBYTESENT)
1360                         goto bad_is;
1361                 break;
1362
1363         case PHASE_SELSTEPS:
1364                 switch (is & IS_BITS) {
1365                 case IS_SELARB:
1366                 case IS_MSGBYTESENT:
1367                         goto bad_is;
1368
1369                 case IS_NOTCOMMAND:
1370                 case IS_EARLYPHASE:
1371                         if ((stat & STAT_BUSMASK) == STAT_MESGIN)
1372                                 break;
1373                         goto bad_is;
1374
1375                 case IS_COMPLETE:
1376                         break;
1377                 }
1378
1379         default:
1380                 break;
1381         }
1382
1383         fas216_cmd(info, CMD_NOP);
1384
1385 #define STATE(st,ph) ((ph) << 3 | (st))
1386         /* This table describes the legal SCSI state transitions,
1387          * as described by the SCSI II spec.
1388          */
1389         switch (STATE(stat & STAT_BUSMASK, info->scsi.phase)) {
1390         case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In      */
1391         case STATE(STAT_DATAIN, PHASE_MSGOUT):  /* Message Out  -> Data In      */
1392         case STATE(STAT_DATAIN, PHASE_COMMAND): /* Command      -> Data In      */
1393         case STATE(STAT_DATAIN, PHASE_MSGIN):   /* Message In   -> Data In      */
1394                 info->scsi.phase = PHASE_DATAIN;
1395                 fas216_transfer(info);
1396                 return;
1397
1398         case STATE(STAT_DATAIN, PHASE_DATAIN):  /* Data In      -> Data In      */
1399         case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out     -> Data Out     */
1400                 fas216_cleanuptransfer(info);
1401                 fas216_transfer(info);
1402                 return;
1403
1404         case STATE(STAT_DATAOUT, PHASE_SELSTEPS):/* Sel w/ steps-> Data Out     */
1405         case STATE(STAT_DATAOUT, PHASE_MSGOUT): /* Message Out  -> Data Out     */
1406         case STATE(STAT_DATAOUT, PHASE_COMMAND):/* Command      -> Data Out     */
1407         case STATE(STAT_DATAOUT, PHASE_MSGIN):  /* Message In   -> Data Out     */
1408                 fas216_cmd(info, CMD_FLUSHFIFO);
1409                 info->scsi.phase = PHASE_DATAOUT;
1410                 fas216_transfer(info);
1411                 return;
1412
1413         case STATE(STAT_STATUS, PHASE_DATAOUT): /* Data Out     -> Status       */
1414         case STATE(STAT_STATUS, PHASE_DATAIN):  /* Data In      -> Status       */
1415                 fas216_stoptransfer(info);
1416         case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status       */
1417         case STATE(STAT_STATUS, PHASE_MSGOUT):  /* Message Out  -> Status       */
1418         case STATE(STAT_STATUS, PHASE_COMMAND): /* Command      -> Status       */
1419         case STATE(STAT_STATUS, PHASE_MSGIN):   /* Message In   -> Status       */
1420                 fas216_cmd(info, CMD_INITCMDCOMPLETE);
1421                 info->scsi.phase = PHASE_STATUS;
1422                 return;
1423
1424         case STATE(STAT_MESGIN, PHASE_DATAOUT): /* Data Out     -> Message In   */
1425         case STATE(STAT_MESGIN, PHASE_DATAIN):  /* Data In      -> Message In   */
1426                 fas216_stoptransfer(info);
1427         case STATE(STAT_MESGIN, PHASE_COMMAND): /* Command      -> Message In   */
1428         case STATE(STAT_MESGIN, PHASE_SELSTEPS):/* Sel w/ steps -> Message In   */
1429         case STATE(STAT_MESGIN, PHASE_MSGOUT):  /* Message Out  -> Message In   */
1430                 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1431                 fas216_cmd(info, CMD_FLUSHFIFO);
1432                 fas216_cmd(info, CMD_TRANSFERINFO);
1433                 info->scsi.phase = PHASE_MSGIN;
1434                 return;
1435
1436         case STATE(STAT_MESGIN, PHASE_MSGIN):
1437                 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1438                 fas216_cmd(info, CMD_TRANSFERINFO);
1439                 return;
1440
1441         case STATE(STAT_COMMAND, PHASE_MSGOUT): /* Message Out  -> Command      */
1442         case STATE(STAT_COMMAND, PHASE_MSGIN):  /* Message In   -> Command      */
1443                 fas216_send_command(info);
1444                 info->scsi.phase = PHASE_COMMAND;
1445                 return;
1446
1447
1448         /*
1449          * Selection    -> Message Out
1450          */
1451         case STATE(STAT_MESGOUT, PHASE_SELECTION):
1452                 fas216_send_messageout(info, 1);
1453                 return;
1454
1455         /*
1456          * Message Out  -> Message Out
1457          */
1458         case STATE(STAT_MESGOUT, PHASE_SELSTEPS):
1459         case STATE(STAT_MESGOUT, PHASE_MSGOUT):
1460                 /*
1461                  * If we get another message out phase, this usually
1462                  * means some parity error occurred.  Resend complete
1463                  * set of messages.  If we have more than one byte to
1464                  * send, we need to assert ATN again.
1465                  */
1466                 if (info->device[info->SCpnt->device->id].parity_check) {
1467                         /*
1468                          * We were testing... good, the device
1469                          * supports parity checking.
1470                          */
1471                         info->device[info->SCpnt->device->id].parity_check = 0;
1472                         info->device[info->SCpnt->device->id].parity_enabled = 1;
1473                         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1474                 }
1475
1476                 if (msgqueue_msglength(&info->scsi.msgs) > 1)
1477                         fas216_cmd(info, CMD_SETATN);
1478                 /*FALLTHROUGH*/
1479
1480         /*
1481          * Any          -> Message Out
1482          */
1483         case STATE(STAT_MESGOUT, PHASE_MSGOUT_EXPECT):
1484                 fas216_send_messageout(info, 0);
1485                 return;
1486
1487         /* Error recovery rules.
1488          *   These either attempt to abort or retry the operation.
1489          * TODO: we need more of these
1490          */
1491         case STATE(STAT_COMMAND, PHASE_COMMAND):/* Command      -> Command      */
1492                 /* error - we've sent out all the command bytes
1493                  * we have.
1494                  * NOTE: we need SAVE DATA POINTERS/RESTORE DATA POINTERS
1495                  * to include the command bytes sent for this to work
1496                  * correctly.
1497                  */
1498                 printk(KERN_ERR "scsi%d.%c: "
1499                         "target trying to receive more command bytes\n",
1500                         info->host->host_no, fas216_target(info));
1501                 fas216_cmd(info, CMD_SETATN);
1502                 fas216_set_stc(info, 15);
1503                 fas216_cmd(info, CMD_PADBYTES | CMD_WITHDMA);
1504                 msgqueue_flush(&info->scsi.msgs);
1505                 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1506                 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1507                 return;
1508         }
1509
1510         if (info->scsi.phase == PHASE_MSGIN_DISCONNECT) {
1511                 printk(KERN_ERR "scsi%d.%c: disconnect message received, but bus service %s?\n",
1512                         info->host->host_no, fas216_target(info),
1513                         fas216_bus_phase(stat));
1514                 msgqueue_flush(&info->scsi.msgs);
1515                 fas216_cmd(info, CMD_SETATN);
1516                 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1517                 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1518                 info->scsi.aborting = 1;
1519                 fas216_cmd(info, CMD_TRANSFERINFO);
1520                 return;
1521         }
1522         printk(KERN_ERR "scsi%d.%c: bus phase %s after %s?\n",
1523                 info->host->host_no, fas216_target(info),
1524                 fas216_bus_phase(stat),
1525                 fas216_drv_phase(info));
1526         print_debug_list();
1527         return;
1528
1529 bad_is:
1530         fas216_log(info, 0, "bus service at step %d?", is & IS_BITS);
1531         fas216_dumpstate(info);
1532         print_debug_list();
1533
1534         fas216_done(info, DID_ERROR);
1535 }
1536
1537 /**
1538  * fas216_funcdone_intr - handle a function done interrupt from FAS216 chip
1539  * @info: interface which caused function done interrupt
1540  * @stat: Status register contents
1541  * @is: SCSI Status register contents
1542  *
1543  * Handle a function done interrupt from FAS216 chip
1544  */
1545 static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
1546 {
1547         unsigned int fifo_len = fas216_readb(info, REG_CFIS) & CFIS_CF;
1548
1549         fas216_checkmagic(info);
1550
1551         fas216_log(info, LOG_FUNCTIONDONE,
1552                    "function done: stat=%02x is=%02x phase=%02x",
1553                    stat, is, info->scsi.phase);
1554
1555         switch (info->scsi.phase) {
1556         case PHASE_STATUS:                      /* status phase - read status and msg   */
1557                 if (fifo_len != 2) {
1558                         fas216_log(info, 0, "odd number of bytes in FIFO: %d", fifo_len);
1559                 }
1560                 /*
1561                  * Read status then message byte.
1562                  */
1563                 info->scsi.SCp.Status = fas216_readb(info, REG_FF);
1564                 info->scsi.SCp.Message = fas216_readb(info, REG_FF);
1565                 info->scsi.phase = PHASE_DONE;
1566                 fas216_cmd(info, CMD_MSGACCEPTED);
1567                 break;
1568
1569         case PHASE_IDLE:
1570         case PHASE_SELECTION:
1571         case PHASE_SELSTEPS:
1572                 break;
1573
1574         case PHASE_MSGIN:                       /* message in phase                     */
1575                 if ((stat & STAT_BUSMASK) == STAT_MESGIN) {
1576                         info->scsi.msgin_fifo = fifo_len;
1577                         fas216_message(info);
1578                         break;
1579                 }
1580
1581         default:
1582                 fas216_log(info, 0, "internal phase %s for function done?"
1583                         "  What do I do with this?",
1584                         fas216_target(info), fas216_drv_phase(info));
1585         }
1586 }
1587
1588 static void fas216_bus_reset(FAS216_Info *info)
1589 {
1590         neg_t sync_state;
1591         int i;
1592
1593         msgqueue_flush(&info->scsi.msgs);
1594
1595         sync_state = neg_invalid;
1596
1597 #ifdef SCSI2_SYNC
1598         if (info->ifcfg.capabilities & (FASCAP_DMA|FASCAP_PSEUDODMA))
1599                 sync_state = neg_wait;
1600 #endif
1601
1602         info->scsi.phase = PHASE_IDLE;
1603         info->SCpnt = NULL; /* bug! */
1604         memset(&info->scsi.SCp, 0, sizeof(info->scsi.SCp));
1605
1606         for (i = 0; i < 8; i++) {
1607                 info->device[i].disconnect_ok   = info->ifcfg.disconnect_ok;
1608                 info->device[i].sync_state      = sync_state;
1609                 info->device[i].period          = info->ifcfg.asyncperiod / 4;
1610                 info->device[i].stp             = info->scsi.async_stp;
1611                 info->device[i].sof             = 0;
1612                 info->device[i].wide_xfer       = 0;
1613         }
1614
1615         info->rst_bus_status = 1;
1616         wake_up(&info->eh_wait);
1617 }
1618
1619 /**
1620  * fas216_intr - handle interrupts to progress a command
1621  * @info: interface to service
1622  *
1623  * Handle interrupts from the interface to progress a command
1624  */
1625 irqreturn_t fas216_intr(FAS216_Info *info)
1626 {
1627         unsigned char inst, is, stat;
1628         int handled = IRQ_NONE;
1629
1630         fas216_checkmagic(info);
1631
1632         stat = fas216_readb(info, REG_STAT);
1633         is = fas216_readb(info, REG_IS);
1634         inst = fas216_readb(info, REG_INST);
1635
1636         add_debug_list(stat, is, inst, info->scsi.phase);
1637
1638         if (stat & STAT_INT) {
1639                 if (inst & INST_BUSRESET) {
1640                         fas216_log(info, 0, "bus reset detected");
1641                         fas216_bus_reset(info);
1642                         scsi_report_bus_reset(info->host, 0);
1643                 } else if (inst & INST_ILLEGALCMD) {
1644                         fas216_log(info, LOG_ERROR, "illegal command given\n");
1645                         fas216_dumpstate(info);
1646                         print_debug_list();
1647                 } else if (inst & INST_DISCONNECT)
1648                         fas216_disconnect_intr(info);
1649                 else if (inst & INST_RESELECTED)        /* reselected                   */
1650                         fas216_reselected_intr(info);
1651                 else if (inst & INST_BUSSERVICE)        /* bus service request          */
1652                         fas216_busservice_intr(info, stat, is);
1653                 else if (inst & INST_FUNCDONE)          /* function done                */
1654                         fas216_funcdone_intr(info, stat, is);
1655                 else
1656                         fas216_log(info, 0, "unknown interrupt received:"
1657                                 " phase %s inst %02X is %02X stat %02X",
1658                                 fas216_drv_phase(info), inst, is, stat);
1659                 handled = IRQ_HANDLED;
1660         }
1661         return handled;
1662 }
1663
1664 static void __fas216_start_command(FAS216_Info *info, Scsi_Cmnd *SCpnt)
1665 {
1666         int tot_msglen;
1667
1668         /* following what the ESP driver says */
1669         fas216_set_stc(info, 0);
1670         fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1671
1672         /* flush FIFO */
1673         fas216_cmd(info, CMD_FLUSHFIFO);
1674
1675         /* load bus-id and timeout */
1676         fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1677         fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1678
1679         /* synchronous transfers */
1680         fas216_set_sync(info, SCpnt->device->id);
1681
1682         tot_msglen = msgqueue_msglength(&info->scsi.msgs);
1683
1684 #ifdef DEBUG_MESSAGES
1685         {
1686                 struct message *msg;
1687                 int msgnr = 0, i;
1688
1689                 printk("scsi%d.%c: message out: ",
1690                         info->host->host_no, '0' + SCpnt->device->id);
1691                 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1692                         printk("{ ");
1693                         for (i = 0; i < msg->length; i++)
1694                                 printk("%02x ", msg->msg[i]);
1695                         printk("} ");
1696                 }
1697                 printk("\n");
1698         }
1699 #endif
1700
1701         if (tot_msglen == 1 || tot_msglen == 3) {
1702                 /*
1703                  * We have an easy message length to send...
1704                  */
1705                 struct message *msg;
1706                 int msgnr = 0, i;
1707
1708                 info->scsi.phase = PHASE_SELSTEPS;
1709
1710                 /* load message bytes */
1711                 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1712                         for (i = 0; i < msg->length; i++)
1713                                 fas216_writeb(info, REG_FF, msg->msg[i]);
1714                         msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
1715                 }
1716
1717                 /* load command */
1718                 for (i = 0; i < SCpnt->cmd_len; i++)
1719                         fas216_writeb(info, REG_FF, SCpnt->cmnd[i]);
1720
1721                 if (tot_msglen == 1)
1722                         fas216_cmd(info, CMD_SELECTATN);
1723                 else
1724                         fas216_cmd(info, CMD_SELECTATN3);
1725         } else {
1726                 /*
1727                  * We have an unusual number of message bytes to send.
1728                  *  Load first byte into fifo, and issue SELECT with ATN and
1729                  *  stop steps.
1730                  */
1731                 struct message *msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1732
1733                 fas216_writeb(info, REG_FF, msg->msg[0]);
1734                 msg->fifo = 1;
1735
1736                 fas216_cmd(info, CMD_SELECTATNSTOP);
1737         }
1738 }
1739
1740 /*
1741  * Decide whether we need to perform a parity test on this device.
1742  * Can also be used to force parity error conditions during initial
1743  * information transfer phase (message out) for test purposes.
1744  */
1745 static int parity_test(FAS216_Info *info, int target)
1746 {
1747 #if 0
1748         if (target == 3) {
1749                 info->device[target].parity_check = 0;
1750                 return 1;
1751         }
1752 #endif
1753         return info->device[target].parity_check;
1754 }
1755
1756 static void fas216_start_command(FAS216_Info *info, Scsi_Cmnd *SCpnt)
1757 {
1758         int disconnect_ok;
1759
1760         /*
1761          * claim host busy
1762          */
1763         info->scsi.phase = PHASE_SELECTION;
1764         info->scsi.SCp = SCpnt->SCp;
1765         info->SCpnt = SCpnt;
1766         info->dma.transfer_type = fasdma_none;
1767
1768         if (parity_test(info, SCpnt->device->id))
1769                 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_PTE);
1770         else
1771                 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1772
1773         /*
1774          * Don't allow request sense commands to disconnect.
1775          */
1776         disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE &&
1777                         info->device[SCpnt->device->id].disconnect_ok;
1778
1779         /*
1780          * build outgoing message bytes
1781          */
1782         msgqueue_flush(&info->scsi.msgs);
1783         msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->device->lun));
1784
1785         /*
1786          * add tag message if required
1787          */
1788         if (SCpnt->tag)
1789                 msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG, SCpnt->tag);
1790
1791         do {
1792 #ifdef SCSI2_SYNC
1793                 if ((info->device[SCpnt->device->id].sync_state == neg_wait ||
1794                      info->device[SCpnt->device->id].sync_state == neg_complete) &&
1795                     (SCpnt->cmnd[0] == REQUEST_SENSE ||
1796                      SCpnt->cmnd[0] == INQUIRY)) {
1797                         info->device[SCpnt->device->id].sync_state = neg_inprogress;
1798                         msgqueue_addmsg(&info->scsi.msgs, 5,
1799                                         EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
1800                                         1000 / info->ifcfg.clockrate,
1801                                         info->ifcfg.sync_max_depth);
1802                         break;
1803                 }
1804 #endif
1805         } while (0);
1806
1807         __fas216_start_command(info, SCpnt);
1808 }
1809
1810 static void fas216_allocate_tag(FAS216_Info *info, Scsi_Cmnd *SCpnt)
1811 {
1812 #ifdef SCSI2_TAG
1813         /*
1814          * tagged queuing - allocate a new tag to this command
1815          */
1816         if (SCpnt->device->simple_tags && SCpnt->cmnd[0] != REQUEST_SENSE &&
1817             SCpnt->cmnd[0] != INQUIRY) {
1818             SCpnt->device->current_tag += 1;
1819                 if (SCpnt->device->current_tag == 0)
1820                     SCpnt->device->current_tag = 1;
1821                         SCpnt->tag = SCpnt->device->current_tag;
1822         } else
1823 #endif
1824                 set_bit(SCpnt->device->id * 8 + SCpnt->device->lun, info->busyluns);
1825
1826         info->stats.removes += 1;
1827         switch (SCpnt->cmnd[0]) {
1828         case WRITE_6:
1829         case WRITE_10:
1830         case WRITE_12:
1831                 info->stats.writes += 1;
1832                 break;
1833         case READ_6:
1834         case READ_10:
1835         case READ_12:
1836                 info->stats.reads += 1;
1837                 break;
1838         default:
1839                 info->stats.miscs += 1;
1840                 break;
1841         }
1842 }
1843
1844 static void fas216_do_bus_device_reset(FAS216_Info *info, Scsi_Cmnd *SCpnt)
1845 {
1846         struct message *msg;
1847
1848         /*
1849          * claim host busy
1850          */
1851         info->scsi.phase = PHASE_SELECTION;
1852         info->scsi.SCp = SCpnt->SCp;
1853         info->SCpnt = SCpnt;
1854         info->dma.transfer_type = fasdma_none;
1855
1856         fas216_log(info, LOG_ERROR, "sending bus device reset");
1857
1858         msgqueue_flush(&info->scsi.msgs);
1859         msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET);
1860
1861         /* following what the ESP driver says */
1862         fas216_set_stc(info, 0);
1863         fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1864
1865         /* flush FIFO */
1866         fas216_cmd(info, CMD_FLUSHFIFO);
1867
1868         /* load bus-id and timeout */
1869         fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1870         fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1871
1872         /* synchronous transfers */
1873         fas216_set_sync(info, SCpnt->device->id);
1874
1875         msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1876
1877         fas216_writeb(info, REG_FF, BUS_DEVICE_RESET);
1878         msg->fifo = 1;
1879
1880         fas216_cmd(info, CMD_SELECTATNSTOP);
1881 }
1882
1883 /**
1884  * fas216_kick - kick a command to the interface
1885  * @info: our host interface to kick
1886  *
1887  * Kick a command to the interface, interface should be idle.
1888  * Notes: Interrupts are always disabled!
1889  */
1890 static void fas216_kick(FAS216_Info *info)
1891 {
1892         Scsi_Cmnd *SCpnt = NULL;
1893 #define TYPE_OTHER      0
1894 #define TYPE_RESET      1
1895 #define TYPE_QUEUE      2
1896         int where_from = TYPE_OTHER;
1897
1898         fas216_checkmagic(info);
1899
1900         /*
1901          * Obtain the next command to process.
1902          */
1903         do {
1904                 if (info->rstSCpnt) {
1905                         SCpnt = info->rstSCpnt;
1906                         /* don't remove it */
1907                         where_from = TYPE_RESET;
1908                         break;
1909                 }
1910
1911                 if (info->reqSCpnt) {
1912                         SCpnt = info->reqSCpnt;
1913                         info->reqSCpnt = NULL;
1914                         break;
1915                 }
1916
1917                 if (info->origSCpnt) {
1918                         SCpnt = info->origSCpnt;
1919                         info->origSCpnt = NULL;
1920                         break;
1921                 }
1922
1923                 /* retrieve next command */
1924                 if (!SCpnt) {
1925                         SCpnt = queue_remove_exclude(&info->queues.issue,
1926                                                      info->busyluns);
1927                         where_from = TYPE_QUEUE;
1928                         break;
1929                 }
1930         } while (0);
1931
1932         if (!SCpnt) {
1933                 /*
1934                  * no command pending, so enable reselection.
1935                  */
1936                 fas216_cmd(info, CMD_ENABLESEL);
1937                 return;
1938         }
1939
1940         /*
1941          * We're going to start a command, so disable reselection
1942          */
1943         fas216_cmd(info, CMD_DISABLESEL);
1944
1945         if (info->scsi.disconnectable && info->SCpnt) {
1946                 fas216_log(info, LOG_CONNECT,
1947                         "moved command for %d to disconnected queue",
1948                         info->SCpnt->device->id);
1949                 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
1950                 info->scsi.disconnectable = 0;
1951                 info->SCpnt = NULL;
1952         }
1953
1954         fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt,
1955                            "starting");
1956
1957         switch (where_from) {
1958         case TYPE_QUEUE:
1959                 fas216_allocate_tag(info, SCpnt);
1960         case TYPE_OTHER:
1961                 fas216_start_command(info, SCpnt);
1962                 break;
1963         case TYPE_RESET:
1964                 fas216_do_bus_device_reset(info, SCpnt);
1965                 break;
1966         }
1967
1968         fas216_log(info, LOG_CONNECT, "select: data pointers [%p, %X]",
1969                 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1970
1971         /*
1972          * should now get either DISCONNECT or
1973          * (FUNCTION DONE with BUS SERVICE) interrupt
1974          */
1975 }
1976
1977 /*
1978  * Clean up from issuing a BUS DEVICE RESET message to a device.
1979  */
1980 static void
1981 fas216_devicereset_done(FAS216_Info *info, Scsi_Cmnd *SCpnt, unsigned int result)
1982 {
1983         fas216_log(info, LOG_ERROR, "fas216 device reset complete");
1984
1985         info->rstSCpnt = NULL;
1986         info->rst_dev_status = 1;
1987         wake_up(&info->eh_wait);
1988 }
1989
1990 /**
1991  * fas216_rq_sns_done - Finish processing automatic request sense command
1992  * @info: interface that completed
1993  * @SCpnt: command that completed
1994  * @result: driver byte of result
1995  *
1996  * Finish processing automatic request sense command
1997  */
1998 static void
1999 fas216_rq_sns_done(FAS216_Info *info, Scsi_Cmnd *SCpnt, unsigned int result)
2000 {
2001         fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
2002                    "request sense complete, result=0x%04x%02x%02x",
2003                    result, SCpnt->SCp.Message, SCpnt->SCp.Status);
2004
2005         if (result != DID_OK || SCpnt->SCp.Status != GOOD)
2006                 /*
2007                  * Something went wrong.  Make sure that we don't
2008                  * have valid data in the sense buffer that could
2009                  * confuse the higher levels.
2010                  */
2011                 memset(SCpnt->sense_buffer, 0, sizeof(SCpnt->sense_buffer));
2012 //printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id);
2013 //{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); }
2014         /*
2015          * Note that we don't set SCpnt->result, since that should
2016          * reflect the status of the command that we were asked by
2017          * the upper layers to process.  This would have been set
2018          * correctly by fas216_std_done.
2019          */
2020         SCpnt->scsi_done(SCpnt);
2021 }
2022
2023 /**
2024  * fas216_std_done - finish processing of standard command
2025  * @info: interface that completed
2026  * @SCpnt: command that completed
2027  * @result: driver byte of result
2028  *
2029  * Finish processing of standard command
2030  */
2031 static void
2032 fas216_std_done(FAS216_Info *info, Scsi_Cmnd *SCpnt, unsigned int result)
2033 {
2034         info->stats.fins += 1;
2035
2036         SCpnt->result = result << 16 | info->scsi.SCp.Message << 8 |
2037                         info->scsi.SCp.Status;
2038
2039         fas216_log_command(info, LOG_CONNECT, SCpnt,
2040                 "command complete, result=0x%08x", SCpnt->result);
2041
2042         /*
2043          * If the driver detected an error, we're all done.
2044          */
2045         if (host_byte(SCpnt->result) != DID_OK ||
2046             msg_byte(SCpnt->result) != COMMAND_COMPLETE)
2047                 goto done;
2048
2049         /*
2050          * If the command returned CHECK_CONDITION or COMMAND_TERMINATED
2051          * status, request the sense information.
2052          */
2053         if (status_byte(SCpnt->result) == CHECK_CONDITION ||
2054             status_byte(SCpnt->result) == COMMAND_TERMINATED)
2055                 goto request_sense;
2056
2057         /*
2058          * If the command did not complete with GOOD status,
2059          * we are all done here.
2060          */
2061         if (status_byte(SCpnt->result) != GOOD)
2062                 goto done;
2063
2064         /*
2065          * We have successfully completed a command.  Make sure that
2066          * we do not have any buffers left to transfer.  The world
2067          * is not perfect, and we seem to occasionally hit this.
2068          * It can be indicative of a buggy driver, target or the upper
2069          * levels of the SCSI code.
2070          */
2071         if (info->scsi.SCp.ptr) {
2072                 switch (SCpnt->cmnd[0]) {
2073                 case INQUIRY:
2074                 case START_STOP:
2075                 case MODE_SENSE:
2076                         break;
2077
2078                 default:
2079                         printk(KERN_ERR "scsi%d.%c: incomplete data transfer "
2080                                 "detected: res=%08X ptr=%p len=%X CDB: ",
2081                                 info->host->host_no, '0' + SCpnt->device->id,
2082                                 SCpnt->result, info->scsi.SCp.ptr,
2083                                 info->scsi.SCp.this_residual);
2084                         print_command(SCpnt->cmnd);
2085                         SCpnt->result &= ~(255 << 16);
2086                         SCpnt->result |= DID_BAD_TARGET << 16;
2087                         goto request_sense;
2088                 }
2089         }
2090
2091 done:
2092         if (SCpnt->scsi_done) {
2093                 SCpnt->scsi_done(SCpnt);
2094                 return;
2095         }
2096
2097         panic("scsi%d.H: null scsi_done function in fas216_done",
2098                 info->host->host_no);
2099
2100
2101 request_sense:
2102         if (SCpnt->cmnd[0] == REQUEST_SENSE)
2103                 goto done;
2104
2105         fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
2106                           "requesting sense");
2107         memset(SCpnt->cmnd, 0, sizeof (SCpnt->cmnd));
2108         SCpnt->cmnd[0] = REQUEST_SENSE;
2109         SCpnt->cmnd[1] = SCpnt->device->lun << 5;
2110         SCpnt->cmnd[4] = sizeof(SCpnt->sense_buffer);
2111         SCpnt->cmd_len = COMMAND_SIZE(SCpnt->cmnd[0]);
2112         SCpnt->SCp.buffer = NULL;
2113         SCpnt->SCp.buffers_residual = 0;
2114         SCpnt->SCp.ptr = (char *)SCpnt->sense_buffer;
2115         SCpnt->SCp.this_residual = sizeof(SCpnt->sense_buffer);
2116         SCpnt->SCp.Message = 0;
2117         SCpnt->SCp.Status = 0;
2118         SCpnt->request_bufflen = sizeof(SCpnt->sense_buffer);
2119         SCpnt->sc_data_direction = SCSI_DATA_READ;
2120         SCpnt->use_sg = 0;
2121         SCpnt->tag = 0;
2122         SCpnt->host_scribble = (void *)fas216_rq_sns_done;
2123
2124         /*
2125          * Place this command into the high priority "request
2126          * sense" slot.  This will be the very next command
2127          * executed, unless a target connects to us.
2128          */
2129         if (info->reqSCpnt)
2130                 printk(KERN_WARNING "scsi%d.%c: loosing request command\n",
2131                         info->host->host_no, '0' + SCpnt->device->id);
2132         info->reqSCpnt = SCpnt;
2133 }
2134
2135 /**
2136  * fas216_done - complete processing for current command
2137  * @info: interface that completed
2138  * @result: driver byte of result
2139  *
2140  * Complete processing for current command
2141  */
2142 static void fas216_done(FAS216_Info *info, unsigned int result)
2143 {
2144         void (*fn)(FAS216_Info *, Scsi_Cmnd *, unsigned int);
2145         Scsi_Cmnd *SCpnt;
2146         unsigned long flags;
2147
2148         fas216_checkmagic(info);
2149
2150         if (!info->SCpnt)
2151                 goto no_command;
2152
2153         SCpnt = info->SCpnt;
2154         info->SCpnt = NULL;
2155         info->scsi.phase = PHASE_IDLE;
2156
2157         if (info->scsi.aborting) {
2158                 fas216_log(info, 0, "uncaught abort - returning DID_ABORT");
2159                 result = DID_ABORT;
2160                 info->scsi.aborting = 0;
2161         }
2162
2163         /*
2164          * Sanity check the completion - if we have zero bytes left
2165          * to transfer, we should not have a valid pointer.
2166          */
2167         if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) {
2168                 printk("scsi%d.%c: zero bytes left to transfer, but "
2169                        "buffer pointer still valid: ptr=%p len=%08x CDB: ",
2170                        info->host->host_no, '0' + SCpnt->device->id,
2171                        info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
2172                 info->scsi.SCp.ptr = NULL;
2173                 print_command(SCpnt->cmnd);
2174         }
2175
2176         /*
2177          * Clear down this command as completed.  If we need to request
2178          * the sense information, fas216_kick will re-assert the busy
2179          * status.
2180          */
2181         info->device[SCpnt->device->id].parity_check = 0;
2182         clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, info->busyluns);
2183
2184         fn = (void (*)(FAS216_Info *, Scsi_Cmnd *, unsigned int))SCpnt->host_scribble;
2185         fn(info, SCpnt, result);
2186
2187         if (info->scsi.irq != NO_IRQ) {
2188                 spin_lock_irqsave(&info->host_lock, flags);
2189                 if (info->scsi.phase == PHASE_IDLE)
2190                         fas216_kick(info);
2191                 spin_unlock_irqrestore(&info->host_lock, flags);
2192         }
2193         return;
2194
2195 no_command:
2196         panic("scsi%d.H: null command in fas216_done",
2197                 info->host->host_no);
2198 }
2199
2200 /**
2201  * fas216_queue_command - queue a command for adapter to process.
2202  * @SCpnt: Command to queue
2203  * @done: done function to call once command is complete
2204  *
2205  * Queue a command for adapter to process.
2206  * Returns: 0 on success, else error.
2207  * Notes: io_request_lock is held, interrupts are disabled.
2208  */
2209 int fas216_queue_command(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *))
2210 {
2211         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2212         int result;
2213
2214         fas216_checkmagic(info);
2215
2216         fas216_log_command(info, LOG_CONNECT, SCpnt,
2217                            "received command (%p)", SCpnt);
2218
2219         SCpnt->scsi_done = done;
2220         SCpnt->host_scribble = (void *)fas216_std_done;
2221         SCpnt->result = 0;
2222
2223         init_SCp(SCpnt);
2224
2225         info->stats.queues += 1;
2226         SCpnt->tag = 0;
2227
2228         spin_lock(&info->host_lock);
2229
2230         /*
2231          * Add command into execute queue and let it complete under
2232          * whatever scheme we're using.
2233          */
2234         result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt);
2235
2236         /*
2237          * If we successfully added the command,
2238          * kick the interface to get it moving.
2239          */
2240         if (result == 0 && info->scsi.phase == PHASE_IDLE)
2241                 fas216_kick(info);
2242         spin_unlock(&info->host_lock);
2243
2244         fas216_log_target(info, LOG_CONNECT, -1, "queue %s",
2245                 result ? "failure" : "success");
2246
2247         return result;
2248 }
2249
2250 /**
2251  * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command
2252  * @SCpnt: Command to wake
2253  *
2254  * Trigger restart of a waiting thread in fas216_command
2255  */
2256 static void fas216_internal_done(Scsi_Cmnd *SCpnt)
2257 {
2258         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2259
2260         fas216_checkmagic(info);
2261
2262         info->internal_done = 1;
2263 }
2264
2265 /**
2266  * fas216_noqueue_command - process a command for the adapter.
2267  * @SCpnt: Command to queue
2268  *
2269  * Queue a command for adapter to process.
2270  * Returns: scsi result code.
2271  * Notes: io_request_lock is held, interrupts are disabled.
2272  */
2273 int fas216_noqueue_command(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *))
2274 {
2275         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2276
2277         fas216_checkmagic(info);
2278
2279         /*
2280          * We should only be using this if we don't have an interrupt.
2281          * Provide some "incentive" to use the queueing code.
2282          */
2283         BUG_ON(info->scsi.irq != NO_IRQ);
2284
2285         info->internal_done = 0;
2286         fas216_queue_command(SCpnt, fas216_internal_done);
2287
2288         /*
2289          * This wastes time, since we can't return until the command is
2290          * complete. We can't sleep either since we may get re-entered!
2291          * However, we must re-enable interrupts, or else we'll be
2292          * waiting forever.
2293          */
2294         spin_unlock_irq(info->host->host_lock);
2295
2296         while (!info->internal_done) {
2297                 /*
2298                  * If we don't have an IRQ, then we must poll the card for
2299                  * it's interrupt, and use that to call this driver's
2300                  * interrupt routine.  That way, we keep the command
2301                  * progressing.  Maybe we can add some inteligence here
2302                  * and go to sleep if we know that the device is going
2303                  * to be some time (eg, disconnected).
2304                  */
2305                 if (fas216_readb(info, REG_STAT) & STAT_INT) {
2306                         spin_lock_irq(info->host->host_lock);
2307                         fas216_intr(info);
2308                         spin_unlock_irq(info->host->host_lock);
2309                 }
2310         }
2311
2312         spin_lock_irq(info->host->host_lock);
2313
2314         done(SCpnt);
2315
2316         return 0;
2317 }
2318
2319 /*
2320  * Error handler timeout function.  Indicate that we timed out,
2321  * and wake up any error handler process so it can continue.
2322  */
2323 static void fas216_eh_timer(unsigned long data)
2324 {
2325         FAS216_Info *info = (FAS216_Info *)data;
2326
2327         fas216_log(info, LOG_ERROR, "error handling timed out\n");
2328
2329         del_timer(&info->eh_timer);
2330
2331         if (info->rst_bus_status == 0)
2332                 info->rst_bus_status = -1;
2333         if (info->rst_dev_status == 0)
2334                 info->rst_dev_status = -1;
2335
2336         wake_up(&info->eh_wait);
2337 }
2338
2339 enum res_find {
2340         res_failed,             /* not found                    */
2341         res_success,            /* command on issue queue       */
2342         res_hw_abort            /* command on disconnected dev  */
2343 };
2344
2345 /**
2346  * fas216_do_abort - decide how to abort a command
2347  * @SCpnt: command to abort
2348  *
2349  * Decide how to abort a command.
2350  * Returns: abort status
2351  */
2352 static enum res_find fas216_find_command(FAS216_Info *info, Scsi_Cmnd *SCpnt)
2353 {
2354         enum res_find res = res_failed;
2355
2356         if (queue_remove_cmd(&info->queues.issue, SCpnt)) {
2357                 /*
2358                  * The command was on the issue queue, and has not been
2359                  * issued yet.  We can remove the command from the queue,
2360                  * and acknowledge the abort.  Neither the device nor the
2361                  * interface know about the command.
2362                  */
2363                 printk("on issue queue ");
2364
2365                 res = res_success;
2366         } else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) {
2367                 /*
2368                  * The command was on the disconnected queue.  We must
2369                  * reconnect with the device if possible, and send it
2370                  * an abort message.
2371                  */
2372                 printk("on disconnected queue ");
2373
2374                 res = res_hw_abort;
2375         } else if (info->SCpnt == SCpnt) {
2376                 printk("executing ");
2377
2378                 switch (info->scsi.phase) {
2379                 /*
2380                  * If the interface is idle, and the command is 'disconnectable',
2381                  * then it is the same as on the disconnected queue.
2382                  */
2383                 case PHASE_IDLE:
2384                         if (info->scsi.disconnectable) {
2385                                 info->scsi.disconnectable = 0;
2386                                 info->SCpnt = NULL;
2387                                 res = res_hw_abort;
2388                         }
2389                         break;
2390
2391                 default:
2392                         break;
2393                 }
2394         } else if (info->origSCpnt == SCpnt) {
2395                 /*
2396                  * The command will be executed next, but a command
2397                  * is currently using the interface.  This is similar to
2398                  * being on the issue queue, except the busylun bit has
2399                  * been set.
2400                  */
2401                 info->origSCpnt = NULL;
2402                 clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, info->busyluns);
2403                 printk("waiting for execution ");
2404                 res = res_success;
2405         } else
2406                 printk("unknown ");
2407
2408         return res;
2409 }
2410
2411 /**
2412  * fas216_eh_abort - abort this command
2413  * @SCpnt: command to abort
2414  *
2415  * Abort this command.
2416  * Returns: FAILED if unable to abort
2417  * Notes: io_request_lock is taken, and irqs are disabled
2418  */
2419 int fas216_eh_abort(Scsi_Cmnd *SCpnt)
2420 {
2421         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2422         int result = FAILED;
2423
2424         fas216_checkmagic(info);
2425
2426         info->stats.aborts += 1;
2427
2428         printk(KERN_WARNING "scsi%d: abort command ", info->host->host_no);
2429         print_command(SCpnt->data_cmnd);
2430
2431         print_debug_list();
2432         fas216_dumpstate(info);
2433
2434         printk(KERN_WARNING "scsi%d: abort %p ", info->host->host_no, SCpnt);
2435
2436         switch (fas216_find_command(info, SCpnt)) {
2437         /*
2438          * We found the command, and cleared it out.  Either
2439          * the command is still known to be executing on the
2440          * target, or the busylun bit is not set.
2441          */
2442         case res_success:
2443                 printk("success\n");
2444                 result = SUCCESS;
2445                 break;
2446
2447         /*
2448          * We need to reconnect to the target and send it an
2449          * ABORT or ABORT_TAG message.  We can only do this
2450          * if the bus is free.
2451          */
2452         case res_hw_abort:
2453                 
2454
2455         /*
2456          * We are unable to abort the command for some reason.
2457          */
2458         default:
2459         case res_failed:
2460                 printk("failed\n");
2461                 break;
2462         }
2463
2464         return result;
2465 }
2466
2467 /**
2468  * fas216_eh_device_reset - Reset the device associated with this command
2469  * @SCpnt: command specifing device to reset
2470  *
2471  * Reset the device associated with this command.
2472  * Returns: FAILED if unable to reset.
2473  * Notes: We won't be re-entered, so we'll only have one device
2474  * reset on the go at one time.
2475  */
2476 int fas216_eh_device_reset(Scsi_Cmnd *SCpnt)
2477 {
2478         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2479         unsigned long flags;
2480         int i, res = FAILED, target = SCpnt->device->id;
2481
2482         fas216_log(info, LOG_ERROR, "device reset for target %d", target);
2483
2484         spin_lock_irqsave(&info->host_lock, flags);
2485
2486         do {
2487                 /*
2488                  * If we are currently connected to a device, and
2489                  * it is the device we want to reset, there is
2490                  * nothing we can do here.  Chances are it is stuck,
2491                  * and we need a bus reset.
2492                  */
2493                 if (info->SCpnt && !info->scsi.disconnectable &&
2494                     info->SCpnt->device->id == SCpnt->device->id)
2495                         break;
2496
2497                 /*
2498                  * We're going to be resetting this device.  Remove
2499                  * all pending commands from the driver.  By doing
2500                  * so, we guarantee that we won't touch the command
2501                  * structures except to process the reset request.
2502                  */
2503                 queue_remove_all_target(&info->queues.issue, target);
2504                 queue_remove_all_target(&info->queues.disconnected, target);
2505                 if (info->origSCpnt && info->origSCpnt->device->id == target)
2506                         info->origSCpnt = NULL;
2507                 if (info->reqSCpnt && info->reqSCpnt->device->id == target)
2508                         info->reqSCpnt = NULL;
2509                 for (i = 0; i < 8; i++)
2510                         clear_bit(target * 8 + i, info->busyluns);
2511
2512                 /*
2513                  * Hijack this SCSI command structure to send
2514                  * a bus device reset message to this device.
2515                  */
2516                 SCpnt->host_scribble = (void *)fas216_devicereset_done;
2517
2518                 info->rst_dev_status = 0;
2519                 info->rstSCpnt = SCpnt;
2520
2521                 if (info->scsi.phase == PHASE_IDLE)
2522                         fas216_kick(info);
2523
2524                 mod_timer(&info->eh_timer, 30 * HZ);
2525                 spin_unlock_irqrestore(&info->host_lock, flags);
2526
2527                 /*
2528                  * Wait up to 30 seconds for the reset to complete.
2529                  */
2530                 wait_event(info->eh_wait, info->rst_dev_status);
2531
2532                 del_timer_sync(&info->eh_timer);
2533                 spin_lock_irqsave(&info->host_lock, flags);
2534                 info->rstSCpnt = NULL;
2535
2536                 if (info->rst_dev_status == 1)
2537                         res = SUCCESS;
2538         } while (0);
2539
2540         SCpnt->host_scribble = NULL;
2541         spin_unlock_irqrestore(&info->host_lock, flags);
2542
2543         fas216_log(info, LOG_ERROR, "device reset complete: %s\n",
2544                    res == SUCCESS ? "success" : "failed");
2545
2546         return res;
2547 }
2548
2549 /**
2550  * fas216_eh_bus_reset - Reset the bus associated with the command
2551  * @SCpnt: command specifing bus to reset
2552  *
2553  * Reset the bus associated with the command.
2554  * Returns: FAILED if unable to reset.
2555  * Notes: Further commands are blocked.
2556  */
2557 int fas216_eh_bus_reset(Scsi_Cmnd *SCpnt)
2558 {
2559         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2560         unsigned long flags;
2561         Scsi_Device *SDpnt;
2562
2563         fas216_checkmagic(info);
2564         fas216_log(info, LOG_ERROR, "resetting bus");
2565
2566         info->stats.bus_resets += 1;
2567
2568         spin_lock_irqsave(&info->host_lock, flags);
2569
2570         /*
2571          * Stop all activity on this interface.
2572          */
2573         fas216_aborttransfer(info);
2574         fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2575
2576         /*
2577          * Clear any pending interrupts.
2578          */
2579         while (fas216_readb(info, REG_STAT) & STAT_INT)
2580                 fas216_readb(info, REG_INST);
2581
2582         info->rst_bus_status = 0;
2583
2584         /*
2585          * For each attached hard-reset device, clear out
2586          * all command structures.  Leave the running
2587          * command in place.
2588          */
2589         shost_for_each_device(SDpnt, info->host) {
2590                 int i;
2591
2592                 if (SDpnt->soft_reset)
2593                         continue;
2594
2595                 queue_remove_all_target(&info->queues.issue, SDpnt->id);
2596                 queue_remove_all_target(&info->queues.disconnected, SDpnt->id);
2597                 if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id)
2598                         info->origSCpnt = NULL;
2599                 if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id)
2600                         info->reqSCpnt = NULL;
2601                 info->SCpnt = NULL;
2602
2603                 for (i = 0; i < 8; i++)
2604                         clear_bit(SDpnt->id * 8 + i, info->busyluns);
2605         }
2606
2607         info->scsi.phase = PHASE_IDLE;
2608
2609         /*
2610          * Reset the SCSI bus.  Device cleanup happens in
2611          * the interrupt handler.
2612          */
2613         fas216_cmd(info, CMD_RESETSCSI);
2614
2615         mod_timer(&info->eh_timer, jiffies + HZ);
2616         spin_unlock_irqrestore(&info->host_lock, flags);
2617
2618         /*
2619          * Wait one second for the interrupt.
2620          */
2621         wait_event(info->eh_wait, info->rst_bus_status);
2622         del_timer_sync(&info->eh_timer);
2623
2624         fas216_log(info, LOG_ERROR, "bus reset complete: %s\n",
2625                    info->rst_bus_status == 1 ? "success" : "failed");
2626
2627         return info->rst_bus_status == 1 ? SUCCESS : FAILED;
2628 }
2629
2630 /**
2631  * fas216_init_chip - Initialise FAS216 state after reset
2632  * @info: state structure for interface
2633  *
2634  * Initialise FAS216 state after reset
2635  */
2636 static void fas216_init_chip(FAS216_Info *info)
2637 {
2638         unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7;
2639         fas216_writeb(info, REG_CLKF, clock);
2640         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2641         fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]);
2642         fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2643         fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
2644         fas216_writeb(info, REG_SOF, 0);
2645         fas216_writeb(info, REG_STP, info->scsi.async_stp);
2646         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2647 }
2648
2649 /**
2650  * fas216_eh_host_reset - Reset the host associated with this command
2651  * @SCpnt: command specifing host to reset
2652  *
2653  * Reset the host associated with this command.
2654  * Returns: FAILED if unable to reset.
2655  * Notes: io_request_lock is taken, and irqs are disabled
2656  */
2657 int fas216_eh_host_reset(Scsi_Cmnd *SCpnt)
2658 {
2659         FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2660
2661         fas216_checkmagic(info);
2662
2663         printk("scsi%d.%c: %s: resetting host\n",
2664                 info->host->host_no, '0' + SCpnt->device->id, __FUNCTION__);
2665
2666         /*
2667          * Reset the SCSI chip.
2668          */
2669         fas216_cmd(info, CMD_RESETCHIP);
2670
2671         /*
2672          * Ugly ugly ugly!
2673          * We need to release the host_lock and enable
2674          * IRQs if we sleep, but we must relock and disable
2675          * IRQs after the sleep.
2676          */
2677         spin_unlock_irq(info->host->host_lock);
2678         msleep(50 * 1000/100);
2679         spin_lock_irq(info->host->host_lock);
2680
2681         /*
2682          * Release the SCSI reset.
2683          */
2684         fas216_cmd(info, CMD_NOP);
2685
2686         fas216_init_chip(info);
2687
2688         return SUCCESS;
2689 }
2690
2691 #define TYPE_UNKNOWN    0
2692 #define TYPE_NCR53C90   1
2693 #define TYPE_NCR53C90A  2
2694 #define TYPE_NCR53C9x   3
2695 #define TYPE_Am53CF94   4
2696 #define TYPE_EmFAS216   5
2697 #define TYPE_QLFAS216   6
2698
2699 static char *chip_types[] = {
2700         "unknown",
2701         "NS NCR53C90",
2702         "NS NCR53C90A",
2703         "NS NCR53C9x",
2704         "AMD Am53CF94",
2705         "Emulex FAS216",
2706         "QLogic FAS216"
2707 };
2708
2709 static int fas216_detect_type(FAS216_Info *info)
2710 {
2711         int family, rev;
2712
2713         /*
2714          * Reset the chip.
2715          */
2716         fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2717         udelay(50);
2718         fas216_writeb(info, REG_CMD, CMD_NOP);
2719
2720         /*
2721          * Check to see if control reg 2 is present.
2722          */
2723         fas216_writeb(info, REG_CNTL3, 0);
2724         fas216_writeb(info, REG_CNTL2, CNTL2_S2FE);
2725
2726         /*
2727          * If we are unable to read back control reg 2
2728          * correctly, it is not present, and we have a
2729          * NCR53C90.
2730          */
2731         if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE)
2732                 return TYPE_NCR53C90;
2733
2734         /*
2735          * Now, check control register 3
2736          */
2737         fas216_writeb(info, REG_CNTL2, 0);
2738         fas216_writeb(info, REG_CNTL3, 0);
2739         fas216_writeb(info, REG_CNTL3, 5);
2740
2741         /*
2742          * If we are unable to read the register back
2743          * correctly, we have a NCR53C90A
2744          */
2745         if (fas216_readb(info, REG_CNTL3) != 5)
2746                 return TYPE_NCR53C90A;
2747
2748         /*
2749          * Now read the ID from the chip.
2750          */
2751         fas216_writeb(info, REG_CNTL3, 0);
2752
2753         fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK);
2754         fas216_writeb(info, REG_CNTL3, 0);
2755
2756         fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2757         udelay(50);
2758         fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP);
2759
2760         fas216_writeb(info, REG_CNTL2, CNTL2_ENF);
2761         fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2762         udelay(50);
2763         fas216_writeb(info, REG_CMD, CMD_NOP);
2764
2765         rev     = fas216_readb(info, REG_ID);
2766         family  = rev >> 3;
2767         rev    &= 7;
2768
2769         switch (family) {
2770         case 0x01:
2771                 if (rev == 4)
2772                         return TYPE_Am53CF94;
2773                 break;
2774
2775         case 0x02:
2776                 switch (rev) {
2777                 case 2:
2778                         return TYPE_EmFAS216;
2779                 case 3:
2780                         return TYPE_QLFAS216;
2781                 }
2782                 break;
2783
2784         default:
2785                 break;
2786         }
2787         printk("family %x rev %x\n", family, rev);
2788         return TYPE_NCR53C9x;
2789 }
2790
2791 /**
2792  * fas216_reset_state - Initialise driver internal state
2793  * @info: state to initialise
2794  *
2795  * Initialise driver internal state
2796  */
2797 static void fas216_reset_state(FAS216_Info *info)
2798 {
2799         int i;
2800
2801         fas216_checkmagic(info);
2802
2803         fas216_bus_reset(info);
2804
2805         /*
2806          * Clear out all stale info in our state structure
2807          */
2808         memset(info->busyluns, 0, sizeof(info->busyluns));
2809         info->scsi.disconnectable = 0;
2810         info->scsi.aborting = 0;
2811
2812         for (i = 0; i < 8; i++) {
2813                 info->device[i].parity_enabled  = 0;
2814                 info->device[i].parity_check    = 1;
2815         }
2816
2817         /*
2818          * Drain all commands on disconnected queue
2819          */
2820         while (queue_remove(&info->queues.disconnected) != NULL);
2821
2822         /*
2823          * Remove executing commands.
2824          */
2825         info->SCpnt     = NULL;
2826         info->reqSCpnt  = NULL;
2827         info->rstSCpnt  = NULL;
2828         info->origSCpnt = NULL;
2829 }
2830
2831 /**
2832  * fas216_init - initialise FAS/NCR/AMD SCSI structures.
2833  * @host: a driver-specific filled-out structure
2834  *
2835  * Initialise FAS/NCR/AMD SCSI structures.
2836  * Returns: 0 on success
2837  */
2838 int fas216_init(struct Scsi_Host *host)
2839 {
2840         FAS216_Info *info = (FAS216_Info *)host->hostdata;
2841
2842         info->magic_start    = MAGIC;
2843         info->magic_end      = MAGIC;
2844         info->host           = host;
2845         info->scsi.cfg[0]    = host->this_id | CNTL1_PERE;
2846         info->scsi.cfg[1]    = CNTL2_ENF | CNTL2_S2FE;
2847         info->scsi.cfg[2]    = info->ifcfg.cntl3 |
2848                                CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM;
2849         info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod);
2850
2851         info->rst_dev_status = -1;
2852         info->rst_bus_status = -1;
2853         init_waitqueue_head(&info->eh_wait);
2854         init_timer(&info->eh_timer);
2855         info->eh_timer.data  = (unsigned long)info;
2856         info->eh_timer.function = fas216_eh_timer;
2857         
2858         spin_lock_init(&info->host_lock);
2859
2860         memset(&info->stats, 0, sizeof(info->stats));
2861
2862         msgqueue_initialise(&info->scsi.msgs);
2863
2864         if (!queue_initialise(&info->queues.issue))
2865                 return -ENOMEM;
2866
2867         if (!queue_initialise(&info->queues.disconnected)) {
2868                 queue_free(&info->queues.issue);
2869                 return -ENOMEM;
2870         }
2871
2872         return 0;
2873 }
2874
2875 /**
2876  * fas216_add - initialise FAS/NCR/AMD SCSI ic.
2877  * @host: a driver-specific filled-out structure
2878  * @dev: parent device
2879  *
2880  * Initialise FAS/NCR/AMD SCSI ic.
2881  * Returns: 0 on success
2882  */
2883 int fas216_add(struct Scsi_Host *host, struct device *dev)
2884 {
2885         FAS216_Info *info = (FAS216_Info *)host->hostdata;
2886         int type, ret;
2887
2888         if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) {
2889                 printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n",
2890                         info->ifcfg.clockrate);
2891                 return -EINVAL;
2892         }
2893
2894         fas216_reset_state(info);
2895         type = fas216_detect_type(info);
2896         info->scsi.type = chip_types[type];
2897
2898         udelay(300);
2899
2900         /*
2901          * Initialise the chip correctly.
2902          */
2903         fas216_init_chip(info);
2904
2905         /*
2906          * Reset the SCSI bus.  We don't want to see
2907          * the resulting reset interrupt, so mask it
2908          * out.
2909          */
2910         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR);
2911         fas216_writeb(info, REG_CMD, CMD_RESETSCSI);
2912
2913         /*
2914          * scsi standard says wait 250ms
2915          */
2916         spin_unlock_irq(info->host->host_lock);
2917         msleep(100*1000/100);
2918         spin_lock_irq(info->host->host_lock);
2919
2920         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2921         fas216_readb(info, REG_INST);
2922
2923         fas216_checkmagic(info);
2924
2925         ret = scsi_add_host(host, dev);
2926         if (ret)
2927                 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2928         else
2929                 scsi_scan_host(host);
2930
2931         return ret;
2932 }
2933
2934 void fas216_remove(struct Scsi_Host *host)
2935 {
2936         FAS216_Info *info = (FAS216_Info *)host->hostdata;
2937
2938         fas216_checkmagic(info);
2939         scsi_remove_host(host);
2940
2941         fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2942         scsi_host_put(host);
2943 }
2944
2945 /**
2946  * fas216_release - release all resources for FAS/NCR/AMD SCSI ic.
2947  * @host: a driver-specific filled-out structure
2948  *
2949  * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic.
2950  */
2951 void fas216_release(struct Scsi_Host *host)
2952 {
2953         FAS216_Info *info = (FAS216_Info *)host->hostdata;
2954
2955         queue_free(&info->queues.disconnected);
2956         queue_free(&info->queues.issue);
2957 }
2958
2959 int fas216_print_host(FAS216_Info *info, char *buffer)
2960 {
2961         return sprintf(buffer,
2962                         "\n"
2963                         "Chip    : %s\n"
2964                         " Address: 0x%p\n"
2965                         " IRQ    : %d\n"
2966                         " DMA    : %d\n",
2967                         info->scsi.type, info->scsi.io_base,
2968                         info->scsi.irq, info->scsi.dma);
2969 }
2970
2971 int fas216_print_stats(FAS216_Info *info, char *buffer)
2972 {
2973         char *p = buffer;
2974
2975         p += sprintf(p, "\n"
2976                         "Command Statistics:\n"
2977                         " Queued     : %u\n"
2978                         " Issued     : %u\n"
2979                         " Completed  : %u\n"
2980                         " Reads      : %u\n"
2981                         " Writes     : %u\n"
2982                         " Others     : %u\n"
2983                         " Disconnects: %u\n"
2984                         " Aborts     : %u\n"
2985                         " Bus resets : %u\n"
2986                         " Host resets: %u\n",
2987                         info->stats.queues,      info->stats.removes,
2988                         info->stats.fins,        info->stats.reads,
2989                         info->stats.writes,      info->stats.miscs,
2990                         info->stats.disconnects, info->stats.aborts,
2991                         info->stats.bus_resets,  info->stats.host_resets);
2992
2993         return p - buffer;
2994 }
2995
2996 int fas216_print_devices(FAS216_Info *info, char *buffer)
2997 {
2998         struct fas216_device *dev;
2999         Scsi_Device *scd;
3000         char *p = buffer;
3001
3002         p += sprintf(p, "Device/Lun TaggedQ       Parity   Sync\n");
3003
3004         shost_for_each_device(scd, info->host) {
3005                 dev = &info->device[scd->id];
3006                 p += sprintf(p, "     %d/%d   ", scd->id, scd->lun);
3007                 if (scd->tagged_supported)
3008                         p += sprintf(p, "%3sabled(%3d) ",
3009                                      scd->simple_tags ? "en" : "dis",
3010                                      scd->current_tag);
3011                 else
3012                         p += sprintf(p, "unsupported   ");
3013
3014                 p += sprintf(p, "%3sabled ", dev->parity_enabled ? "en" : "dis");
3015
3016                 if (dev->sof)
3017                         p += sprintf(p, "offset %d, %d ns\n",
3018                                      dev->sof, dev->period * 4);
3019                 else
3020                         p += sprintf(p, "async\n");
3021         }
3022
3023         return p - buffer;
3024 }
3025
3026 EXPORT_SYMBOL(fas216_init);
3027 EXPORT_SYMBOL(fas216_add);
3028 EXPORT_SYMBOL(fas216_queue_command);
3029 EXPORT_SYMBOL(fas216_noqueue_command);
3030 EXPORT_SYMBOL(fas216_intr);
3031 EXPORT_SYMBOL(fas216_remove);
3032 EXPORT_SYMBOL(fas216_release);
3033 EXPORT_SYMBOL(fas216_eh_abort);
3034 EXPORT_SYMBOL(fas216_eh_device_reset);
3035 EXPORT_SYMBOL(fas216_eh_bus_reset);
3036 EXPORT_SYMBOL(fas216_eh_host_reset);
3037 EXPORT_SYMBOL(fas216_print_host);
3038 EXPORT_SYMBOL(fas216_print_stats);
3039 EXPORT_SYMBOL(fas216_print_devices);
3040
3041 MODULE_AUTHOR("Russell King");
3042 MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core");
3043 MODULE_LICENSE("GPL");