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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/scsi/arm/fas216.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/scsi/arm/fas216.c')
-rw-r--r--drivers/scsi/arm/fas216.c3043
1 files changed, 3043 insertions, 0 deletions
diff --git a/drivers/scsi/arm/fas216.c b/drivers/scsi/arm/fas216.c
new file mode 100644
index 000000000000..5411e850c833
--- /dev/null
+++ b/drivers/scsi/arm/fas216.c
@@ -0,0 +1,3043 @@
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
97static int level_mask = LOG_ERROR;
98
99module_param(level_mask, int, 0644);
100
101static 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
142static 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
148static 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
154static 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
175static 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
182static 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
227static 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
248static 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
260static 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
282static 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
290static void
291fas216_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
299static void
300fas216_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
315static void
316fas216_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
335static 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
351static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE];
352static int ph_ptr;
353
354static 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
364static struct { int command; void *from; } cmd_list[8];
365static int cmd_ptr;
366
367static 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
377static 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
404static 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 */
413static inline unsigned short
414fas216_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 */
446static 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 */
470static 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 */
515static 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 */
628static 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 */
668static 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
683static 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
690static 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 */
704static 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 */
748static 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 */
830static 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
863static 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
875static 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 */
883static 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 */
937static void
938fas216_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
1052static 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
1142unrecognised:
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 */
1154fas216_cmd(info, CMD_NOP);
1155fas216_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;
1160fas216_dumpstate(info);
1161}
1162
1163static 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
1180static 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
1207timedout:
1208 fas216_log(info, LOG_ERROR, "timed out waiting for message byte");
1209 return -1;
1210
1211unexpected_phase_change:
1212 fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat);
1213 return -2;
1214
1215parity_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 */
1226static 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
1272parity_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 */
1287static 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 */
1312static 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 */
1349static 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
1529bad_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 */
1545static 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
1588static 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 */
1625irqreturn_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
1664static 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 */
1745static 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
1756static 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
1810static 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
1844static 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 */
1890static 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 */
1980static void
1981fas216_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 */
1998static void
1999fas216_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 */
2031static void
2032fas216_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
2091done:
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
2101request_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 */
2142static 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
2195no_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 */
2209int 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 */
2256static 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 */
2273int 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 */
2323static 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
2339enum 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 */
2352static 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 */
2419int 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 */
2476int 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 */
2557int 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 */
2636static 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 */
2657int 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
2699static 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
2709static 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 */
2797static 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 */
2838int 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 */
2883int 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
2934void 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 */
2951void 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
2959int 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
2971int 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
2996int 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
3026EXPORT_SYMBOL(fas216_init);
3027EXPORT_SYMBOL(fas216_add);
3028EXPORT_SYMBOL(fas216_queue_command);
3029EXPORT_SYMBOL(fas216_noqueue_command);
3030EXPORT_SYMBOL(fas216_intr);
3031EXPORT_SYMBOL(fas216_remove);
3032EXPORT_SYMBOL(fas216_release);
3033EXPORT_SYMBOL(fas216_eh_abort);
3034EXPORT_SYMBOL(fas216_eh_device_reset);
3035EXPORT_SYMBOL(fas216_eh_bus_reset);
3036EXPORT_SYMBOL(fas216_eh_host_reset);
3037EXPORT_SYMBOL(fas216_print_host);
3038EXPORT_SYMBOL(fas216_print_stats);
3039EXPORT_SYMBOL(fas216_print_devices);
3040
3041MODULE_AUTHOR("Russell King");
3042MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core");
3043MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 14:21:57 -0500