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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/drivers/acorn/scsi/fas216.c
4 *
5 * Copyright (C) 1997-2003 Russell King
6 *
7 * Based on information in qlogicfas.c by Tom Zerucha, Michael Griffith, and
8 * other sources, including:
9 * the AMD Am53CF94 data sheet
10 * the AMD Am53C94 data sheet
11 *
12 * This is a generic driver. To use it, have a look at cumana_2.c. You
13 * should define your own structure that overlays FAS216_Info, eg:
14 * struct my_host_data {
15 * FAS216_Info info;
16 * ... my host specific data ...
17 * };
18 *
19 * Changelog:
20 * 30-08-1997 RMK Created
21 * 14-09-1997 RMK Started disconnect support
22 * 08-02-1998 RMK Corrected real DMA support
23 * 15-02-1998 RMK Started sync xfer support
24 * 06-04-1998 RMK Tightened conditions for printing incomplete
25 * transfers
26 * 02-05-1998 RMK Added extra checks in fas216_reset
27 * 24-05-1998 RMK Fixed synchronous transfers with period >= 200ns
28 * 27-06-1998 RMK Changed asm/delay.h to linux/delay.h
29 * 26-08-1998 RMK Improved message support wrt MESSAGE_REJECT
30 * 02-04-2000 RMK Converted to use the new error handling, and
31 * automatically request sense data upon check
32 * condition status from targets.
33 */
34#include <linux/module.h>
35#include <linux/blkdev.h>
36#include <linux/kernel.h>
37#include <linux/string.h>
38#include <linux/ioport.h>
39#include <linux/proc_fs.h>
40#include <linux/delay.h>
41#include <linux/bitops.h>
42#include <linux/init.h>
43#include <linux/interrupt.h>
44
45#include <asm/dma.h>
46#include <asm/io.h>
47#include <asm/irq.h>
48#include <asm/ecard.h>
49
50#include <scsi/scsi.h>
51#include <scsi/scsi_cmnd.h>
52#include <scsi/scsi_dbg.h>
53#include <scsi/scsi_device.h>
54#include <scsi/scsi_eh.h>
55#include <scsi/scsi_host.h>
56#include <scsi/scsi_tcq.h>
57#include "fas216.h"
58#include "arm_scsi.h"
59
60/* NOTE: SCSI2 Synchronous transfers *require* DMA according to
61 * the data sheet. This restriction is crazy, especially when
62 * you only want to send 16 bytes! What were the guys who
63 * designed this chip on at that time? Did they read the SCSI2
64 * spec at all? The following sections are taken from the SCSI2
65 * standard (s2r10) concerning this:
66 *
67 * > IMPLEMENTORS NOTES:
68 * > (1) Re-negotiation at every selection is not recommended, since a
69 * > significant performance impact is likely.
70 *
71 * > The implied synchronous agreement shall remain in effect until a BUS DEVICE
72 * > RESET message is received, until a hard reset condition occurs, or until one
73 * > of the two SCSI devices elects to modify the agreement. The default data
74 * > transfer mode is asynchronous data transfer mode. The default data transfer
75 * > mode is entered at power on, after a BUS DEVICE RESET message, or after a hard
76 * > reset condition.
77 *
78 * In total, this means that once you have elected to use synchronous
79 * transfers, you must always use DMA.
80 *
81 * I was thinking that this was a good chip until I found this restriction ;(
82 */
83#define SCSI2_SYNC
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
101#ifndef MODULE
102static int __init fas216_log_setup(char *str)
103{
104 char *s;
105
106 level_mask = 0;
107
108 while ((s = strsep(&str, ",")) != NULL) {
109 switch (s[0]) {
110 case 'a':
111 if (strcmp(s, "all") == 0)
112 level_mask |= -1;
113 break;
114 case 'b':
115 if (strncmp(s, "bus", 3) == 0)
116 level_mask |= LOG_BUSSERVICE;
117 if (strncmp(s, "buf", 3) == 0)
118 level_mask |= LOG_BUFFER;
119 break;
120 case 'c':
121 level_mask |= LOG_CONNECT;
122 break;
123 case 'e':
124 level_mask |= LOG_ERROR;
125 break;
126 case 'm':
127 level_mask |= LOG_MESSAGES;
128 break;
129 case 'n':
130 if (strcmp(s, "none") == 0)
131 level_mask = 0;
132 break;
133 case 's':
134 level_mask |= LOG_FUNCTIONDONE;
135 break;
136 }
137 }
138 return 1;
139}
140
141__setup("fas216_logging=", fas216_log_setup);
142#endif
143
144static inline unsigned char fas216_readb(FAS216_Info *info, unsigned int reg)
145{
146 unsigned int off = reg << info->scsi.io_shift;
147 return readb(info->scsi.io_base + off);
148}
149
150static inline void fas216_writeb(FAS216_Info *info, unsigned int reg, unsigned int val)
151{
152 unsigned int off = reg << info->scsi.io_shift;
153 writeb(val, info->scsi.io_base + off);
154}
155
156static void fas216_dumpstate(FAS216_Info *info)
157{
158 unsigned char is, stat, inst;
159
160 is = fas216_readb(info, REG_IS);
161 stat = fas216_readb(info, REG_STAT);
162 inst = fas216_readb(info, REG_INST);
163
164 printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X"
165 " INST=%02X IS=%02X CFIS=%02X",
166 fas216_readb(info, REG_CTCL),
167 fas216_readb(info, REG_CTCM),
168 fas216_readb(info, REG_CMD), stat, inst, is,
169 fas216_readb(info, REG_CFIS));
170 printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n",
171 fas216_readb(info, REG_CNTL1),
172 fas216_readb(info, REG_CNTL2),
173 fas216_readb(info, REG_CNTL3),
174 fas216_readb(info, REG_CTCH));
175}
176
177static void print_SCp(struct scsi_pointer *SCp, const char *prefix, const char *suffix)
178{
179 printk("%sptr %p this_residual 0x%x buffer %p buffers_residual 0x%x%s",
180 prefix, SCp->ptr, SCp->this_residual, SCp->buffer,
181 SCp->buffers_residual, suffix);
182}
183
184#ifdef CHECK_STRUCTURE
185static void fas216_dumpinfo(FAS216_Info *info)
186{
187 static int used = 0;
188 int i;
189
190 if (used++)
191 return;
192
193 printk("FAS216_Info=\n");
194 printk(" { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p\n",
195 info->magic_start, info->host, info->SCpnt,
196 info->origSCpnt);
197 printk(" scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }\n",
198 info->scsi.io_shift, info->scsi.irq,
199 info->scsi.cfg[0], info->scsi.cfg[1], info->scsi.cfg[2],
200 info->scsi.cfg[3]);
201 printk(" type=%p phase=%X\n",
202 info->scsi.type, info->scsi.phase);
203 print_SCp(&info->scsi.SCp, " SCp={ ", " }\n");
204 printk(" msgs async_stp=%X disconnectable=%d aborting=%d }\n",
205 info->scsi.async_stp,
206 info->scsi.disconnectable, info->scsi.aborting);
207 printk(" stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X\n"
208 " disconnects=%X aborts=%X bus_resets=%X host_resets=%X}\n",
209 info->stats.queues, info->stats.removes, info->stats.fins,
210 info->stats.reads, info->stats.writes, info->stats.miscs,
211 info->stats.disconnects, info->stats.aborts, info->stats.bus_resets,
212 info->stats.host_resets);
213 printk(" ifcfg={ clockrate=%X select_timeout=%X asyncperiod=%X sync_max_depth=%X }\n",
214 info->ifcfg.clockrate, info->ifcfg.select_timeout,
215 info->ifcfg.asyncperiod, info->ifcfg.sync_max_depth);
216 for (i = 0; i < 8; i++) {
217 printk(" busyluns[%d]=%08lx dev[%d]={ disconnect_ok=%d stp=%X sof=%X sync_state=%X }\n",
218 i, info->busyluns[i], i,
219 info->device[i].disconnect_ok, info->device[i].stp,
220 info->device[i].sof, info->device[i].sync_state);
221 }
222 printk(" dma={ transfer_type=%X setup=%p pseudo=%p stop=%p }\n",
223 info->dma.transfer_type, info->dma.setup,
224 info->dma.pseudo, info->dma.stop);
225 printk(" internal_done=%X magic_end=%lX }\n",
226 info->internal_done, info->magic_end);
227}
228
229static void __fas216_checkmagic(FAS216_Info *info, const char *func)
230{
231 int corruption = 0;
232 if (info->magic_start != MAGIC) {
233 printk(KERN_CRIT "FAS216 Error: magic at start corrupted\n");
234 corruption++;
235 }
236 if (info->magic_end != MAGIC) {
237 printk(KERN_CRIT "FAS216 Error: magic at end corrupted\n");
238 corruption++;
239 }
240 if (corruption) {
241 fas216_dumpinfo(info);
242 panic("scsi memory space corrupted in %s", func);
243 }
244}
245#define fas216_checkmagic(info) __fas216_checkmagic((info), __func__)
246#else
247#define fas216_checkmagic(info)
248#endif
249
250static const char *fas216_bus_phase(int stat)
251{
252 static const char *phases[] = {
253 "DATA OUT", "DATA IN",
254 "COMMAND", "STATUS",
255 "MISC OUT", "MISC IN",
256 "MESG OUT", "MESG IN"
257 };
258
259 return phases[stat & STAT_BUSMASK];
260}
261
262static const char *fas216_drv_phase(FAS216_Info *info)
263{
264 static const char *phases[] = {
265 [PHASE_IDLE] = "idle",
266 [PHASE_SELECTION] = "selection",
267 [PHASE_COMMAND] = "command",
268 [PHASE_DATAOUT] = "data out",
269 [PHASE_DATAIN] = "data in",
270 [PHASE_MSGIN] = "message in",
271 [PHASE_MSGIN_DISCONNECT]= "disconnect",
272 [PHASE_MSGOUT_EXPECT] = "expect message out",
273 [PHASE_MSGOUT] = "message out",
274 [PHASE_STATUS] = "status",
275 [PHASE_DONE] = "done",
276 };
277
278 if (info->scsi.phase < ARRAY_SIZE(phases) &&
279 phases[info->scsi.phase])
280 return phases[info->scsi.phase];
281 return "???";
282}
283
284static char fas216_target(FAS216_Info *info)
285{
286 if (info->SCpnt)
287 return '0' + info->SCpnt->device->id;
288 else
289 return 'H';
290}
291
292static void
293fas216_do_log(FAS216_Info *info, char target, char *fmt, va_list ap)
294{
295 static char buf[1024];
296
297 vsnprintf(buf, sizeof(buf), fmt, ap);
298 printk("scsi%d.%c: %s", info->host->host_no, target, buf);
299}
300
301static void fas216_log_command(FAS216_Info *info, int level,
302 struct scsi_cmnd *SCpnt, char *fmt, ...)
303{
304 va_list args;
305
306 if (level != 0 && !(level & level_mask))
307 return;
308
309 va_start(args, fmt);
310 fas216_do_log(info, '0' + SCpnt->device->id, fmt, args);
311 va_end(args);
312
313 scsi_print_command(SCpnt);
314}
315
316static void
317fas216_log_target(FAS216_Info *info, int level, int target, char *fmt, ...)
318{
319 va_list args;
320
321 if (level != 0 && !(level & level_mask))
322 return;
323
324 if (target < 0)
325 target = 'H';
326 else
327 target += '0';
328
329 va_start(args, fmt);
330 fas216_do_log(info, target, fmt, args);
331 va_end(args);
332
333 printk("\n");
334}
335
336static void fas216_log(FAS216_Info *info, int level, char *fmt, ...)
337{
338 va_list args;
339
340 if (level != 0 && !(level & level_mask))
341 return;
342
343 va_start(args, fmt);
344 fas216_do_log(info, fas216_target(info), fmt, args);
345 va_end(args);
346
347 printk("\n");
348}
349
350#define PH_SIZE 32
351
352static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE];
353static int ph_ptr;
354
355static void add_debug_list(int stat, int ssr, int isr, int ph)
356{
357 ph_list[ph_ptr].stat = stat;
358 ph_list[ph_ptr].ssr = ssr;
359 ph_list[ph_ptr].isr = isr;
360 ph_list[ph_ptr].ph = ph;
361
362 ph_ptr = (ph_ptr + 1) & (PH_SIZE-1);
363}
364
365static struct { int command; void *from; } cmd_list[8];
366static int cmd_ptr;
367
368static void fas216_cmd(FAS216_Info *info, unsigned int command)
369{
370 cmd_list[cmd_ptr].command = command;
371 cmd_list[cmd_ptr].from = __builtin_return_address(0);
372
373 cmd_ptr = (cmd_ptr + 1) & 7;
374
375 fas216_writeb(info, REG_CMD, command);
376}
377
378static void print_debug_list(void)
379{
380 int i;
381
382 i = ph_ptr;
383
384 printk(KERN_ERR "SCSI IRQ trail\n");
385 do {
386 printk(" %02x:%02x:%02x:%1x",
387 ph_list[i].stat, ph_list[i].ssr,
388 ph_list[i].isr, ph_list[i].ph);
389 i = (i + 1) & (PH_SIZE - 1);
390 if (((i ^ ph_ptr) & 7) == 0)
391 printk("\n");
392 } while (i != ph_ptr);
393 if ((i ^ ph_ptr) & 7)
394 printk("\n");
395
396 i = cmd_ptr;
397 printk(KERN_ERR "FAS216 commands: ");
398 do {
399 printk("%02x:%p ", cmd_list[i].command, cmd_list[i].from);
400 i = (i + 1) & 7;
401 } while (i != cmd_ptr);
402 printk("\n");
403}
404
405static void fas216_done(FAS216_Info *info, unsigned int result);
406
407/**
408 * fas216_get_last_msg - retrive last message from the list
409 * @info: interface to search
410 * @pos: current fifo position
411 *
412 * Retrieve a last message from the list, using position in fifo.
413 */
414static inline unsigned short
415fas216_get_last_msg(FAS216_Info *info, int pos)
416{
417 unsigned short packed_msg = NOP;
418 struct message *msg;
419 int msgnr = 0;
420
421 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
422 if (pos >= msg->fifo)
423 break;
424 }
425
426 if (msg) {
427 if (msg->msg[0] == EXTENDED_MESSAGE)
428 packed_msg = EXTENDED_MESSAGE | msg->msg[2] << 8;
429 else
430 packed_msg = msg->msg[0];
431 }
432
433 fas216_log(info, LOG_MESSAGES,
434 "Message: %04x found at position %02x\n", packed_msg, pos);
435
436 return packed_msg;
437}
438
439/**
440 * fas216_syncperiod - calculate STP register value
441 * @info: state structure for interface connected to device
442 * @ns: period in ns (between subsequent bytes)
443 *
444 * Calculate value to be loaded into the STP register for a given period
445 * in ns. Returns a value suitable for REG_STP.
446 */
447static int fas216_syncperiod(FAS216_Info *info, int ns)
448{
449 int value = (info->ifcfg.clockrate * ns) / 1000;
450
451 fas216_checkmagic(info);
452
453 if (value < 4)
454 value = 4;
455 else if (value > 35)
456 value = 35;
457
458 return value & 31;
459}
460
461/**
462 * fas216_set_sync - setup FAS216 chip for specified transfer period.
463 * @info: state structure for interface connected to device
464 * @target: target
465 *
466 * Correctly setup FAS216 chip for specified transfer period.
467 * Notes : we need to switch the chip out of FASTSCSI mode if we have
468 * a transfer period >= 200ns - otherwise the chip will violate
469 * the SCSI timings.
470 */
471static void fas216_set_sync(FAS216_Info *info, int target)
472{
473 unsigned int cntl3;
474
475 fas216_writeb(info, REG_SOF, info->device[target].sof);
476 fas216_writeb(info, REG_STP, info->device[target].stp);
477
478 cntl3 = info->scsi.cfg[2];
479 if (info->device[target].period >= (200 / 4))
480 cntl3 = cntl3 & ~CNTL3_FASTSCSI;
481
482 fas216_writeb(info, REG_CNTL3, cntl3);
483}
484
485/* Synchronous transfer support
486 *
487 * Note: The SCSI II r10 spec says (5.6.12):
488 *
489 * (2) Due to historical problems with early host adapters that could
490 * not accept an SDTR message, some targets may not initiate synchronous
491 * negotiation after a power cycle as required by this standard. Host
492 * adapters that support synchronous mode may avoid the ensuing failure
493 * modes when the target is independently power cycled by initiating a
494 * synchronous negotiation on each REQUEST SENSE and INQUIRY command.
495 * This approach increases the SCSI bus overhead and is not recommended
496 * for new implementations. The correct method is to respond to an
497 * SDTR message with a MESSAGE REJECT message if the either the
498 * initiator or target devices does not support synchronous transfers
499 * or does not want to negotiate for synchronous transfers at the time.
500 * Using the correct method assures compatibility with wide data
501 * transfers and future enhancements.
502 *
503 * We will always initiate a synchronous transfer negotiation request on
504 * every INQUIRY or REQUEST SENSE message, unless the target itself has
505 * at some point performed a synchronous transfer negotiation request, or
506 * we have synchronous transfers disabled for this device.
507 */
508
509/**
510 * fas216_handlesync - Handle a synchronous transfer message
511 * @info: state structure for interface
512 * @msg: message from target
513 *
514 * Handle a synchronous transfer message from the target
515 */
516static void fas216_handlesync(FAS216_Info *info, char *msg)
517{
518 struct fas216_device *dev = &info->device[info->SCpnt->device->id];
519 enum { sync, async, none, reject } res = none;
520
521#ifdef SCSI2_SYNC
522 switch (msg[0]) {
523 case MESSAGE_REJECT:
524 /* Synchronous transfer request failed.
525 * Note: SCSI II r10:
526 *
527 * SCSI devices that are capable of synchronous
528 * data transfers shall not respond to an SDTR
529 * message with a MESSAGE REJECT message.
530 *
531 * Hence, if we get this condition, we disable
532 * negotiation for this device.
533 */
534 if (dev->sync_state == neg_inprogress) {
535 dev->sync_state = neg_invalid;
536 res = async;
537 }
538 break;
539
540 case EXTENDED_MESSAGE:
541 switch (dev->sync_state) {
542 /* We don't accept synchronous transfer requests.
543 * Respond with a MESSAGE_REJECT to prevent a
544 * synchronous transfer agreement from being reached.
545 */
546 case neg_invalid:
547 res = reject;
548 break;
549
550 /* We were not negotiating a synchronous transfer,
551 * but the device sent us a negotiation request.
552 * Honour the request by sending back a SDTR
553 * message containing our capability, limited by
554 * the targets capability.
555 */
556 default:
557 fas216_cmd(info, CMD_SETATN);
558 if (msg[4] > info->ifcfg.sync_max_depth)
559 msg[4] = info->ifcfg.sync_max_depth;
560 if (msg[3] < 1000 / info->ifcfg.clockrate)
561 msg[3] = 1000 / info->ifcfg.clockrate;
562
563 msgqueue_flush(&info->scsi.msgs);
564 msgqueue_addmsg(&info->scsi.msgs, 5,
565 EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
566 msg[3], msg[4]);
567 info->scsi.phase = PHASE_MSGOUT_EXPECT;
568
569 /* This is wrong. The agreement is not in effect
570 * until this message is accepted by the device
571 */
572 dev->sync_state = neg_targcomplete;
573 res = sync;
574 break;
575
576 /* We initiated the synchronous transfer negotiation,
577 * and have successfully received a response from the
578 * target. The synchronous transfer agreement has been
579 * reached. Note: if the values returned are out of our
580 * bounds, we must reject the message.
581 */
582 case neg_inprogress:
583 res = reject;
584 if (msg[4] <= info->ifcfg.sync_max_depth &&
585 msg[3] >= 1000 / info->ifcfg.clockrate) {
586 dev->sync_state = neg_complete;
587 res = sync;
588 }
589 break;
590 }
591 }
592#else
593 res = reject;
594#endif
595
596 switch (res) {
597 case sync:
598 dev->period = msg[3];
599 dev->sof = msg[4];
600 dev->stp = fas216_syncperiod(info, msg[3] * 4);
601 fas216_set_sync(info, info->SCpnt->device->id);
602 break;
603
604 case reject:
605 fas216_cmd(info, CMD_SETATN);
606 msgqueue_flush(&info->scsi.msgs);
607 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
608 info->scsi.phase = PHASE_MSGOUT_EXPECT;
609 fallthrough;
610
611 case async:
612 dev->period = info->ifcfg.asyncperiod / 4;
613 dev->sof = 0;
614 dev->stp = info->scsi.async_stp;
615 fas216_set_sync(info, info->SCpnt->device->id);
616 break;
617
618 case none:
619 break;
620 }
621}
622
623/**
624 * fas216_updateptrs - update data pointers after transfer suspended/paused
625 * @info: interface's local pointer to update
626 * @bytes_transferred: number of bytes transferred
627 *
628 * Update data pointers after transfer suspended/paused
629 */
630static void fas216_updateptrs(FAS216_Info *info, int bytes_transferred)
631{
632 struct scsi_pointer *SCp = &info->scsi.SCp;
633
634 fas216_checkmagic(info);
635
636 BUG_ON(bytes_transferred < 0);
637
638 SCp->phase -= bytes_transferred;
639
640 while (bytes_transferred != 0) {
641 if (SCp->this_residual > bytes_transferred)
642 break;
643 /*
644 * We have used up this buffer. Move on to the
645 * next buffer.
646 */
647 bytes_transferred -= SCp->this_residual;
648 if (!next_SCp(SCp) && bytes_transferred) {
649 printk(KERN_WARNING "scsi%d.%c: out of buffers\n",
650 info->host->host_no, '0' + info->SCpnt->device->id);
651 return;
652 }
653 }
654
655 SCp->this_residual -= bytes_transferred;
656 if (SCp->this_residual)
657 SCp->ptr += bytes_transferred;
658 else
659 SCp->ptr = NULL;
660}
661
662/**
663 * fas216_pio - transfer data off of/on to card using programmed IO
664 * @info: interface to transfer data to/from
665 * @direction: direction to transfer data (DMA_OUT/DMA_IN)
666 *
667 * Transfer data off of/on to card using programmed IO.
668 * Notes: this is incredibly slow.
669 */
670static void fas216_pio(FAS216_Info *info, fasdmadir_t direction)
671{
672 struct scsi_pointer *SCp = &info->scsi.SCp;
673
674 fas216_checkmagic(info);
675
676 if (direction == DMA_OUT)
677 fas216_writeb(info, REG_FF, get_next_SCp_byte(SCp));
678 else
679 put_next_SCp_byte(SCp, fas216_readb(info, REG_FF));
680
681 if (SCp->this_residual == 0)
682 next_SCp(SCp);
683}
684
685static void fas216_set_stc(FAS216_Info *info, unsigned int length)
686{
687 fas216_writeb(info, REG_STCL, length);
688 fas216_writeb(info, REG_STCM, length >> 8);
689 fas216_writeb(info, REG_STCH, length >> 16);
690}
691
692static unsigned int fas216_get_ctc(FAS216_Info *info)
693{
694 return fas216_readb(info, REG_CTCL) +
695 (fas216_readb(info, REG_CTCM) << 8) +
696 (fas216_readb(info, REG_CTCH) << 16);
697}
698
699/**
700 * fas216_cleanuptransfer - clean up after a transfer has completed.
701 * @info: interface to clean up
702 *
703 * Update the data pointers according to the number of bytes transferred
704 * on the SCSI bus.
705 */
706static void fas216_cleanuptransfer(FAS216_Info *info)
707{
708 unsigned long total, residual, fifo;
709 fasdmatype_t dmatype = info->dma.transfer_type;
710
711 info->dma.transfer_type = fasdma_none;
712
713 /*
714 * PIO transfers do not need to be cleaned up.
715 */
716 if (dmatype == fasdma_pio || dmatype == fasdma_none)
717 return;
718
719 if (dmatype == fasdma_real_all)
720 total = info->scsi.SCp.phase;
721 else
722 total = info->scsi.SCp.this_residual;
723
724 residual = fas216_get_ctc(info);
725
726 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
727
728 fas216_log(info, LOG_BUFFER, "cleaning up from previous "
729 "transfer: length 0x%06x, residual 0x%x, fifo %d",
730 total, residual, fifo);
731
732 /*
733 * If we were performing Data-Out, the transfer counter
734 * counts down each time a byte is transferred by the
735 * host to the FIFO. This means we must include the
736 * bytes left in the FIFO from the transfer counter.
737 */
738 if (info->scsi.phase == PHASE_DATAOUT)
739 residual += fifo;
740
741 fas216_updateptrs(info, total - residual);
742}
743
744/**
745 * fas216_transfer - Perform a DMA/PIO transfer off of/on to card
746 * @info: interface from which device disconnected from
747 *
748 * Start a DMA/PIO transfer off of/on to card
749 */
750static void fas216_transfer(FAS216_Info *info)
751{
752 fasdmadir_t direction;
753 fasdmatype_t dmatype;
754
755 fas216_log(info, LOG_BUFFER,
756 "starttransfer: buffer %p length 0x%06x reqlen 0x%06x",
757 info->scsi.SCp.ptr, info->scsi.SCp.this_residual,
758 info->scsi.SCp.phase);
759
760 if (!info->scsi.SCp.ptr) {
761 fas216_log(info, LOG_ERROR, "null buffer passed to "
762 "fas216_starttransfer");
763 print_SCp(&info->scsi.SCp, "SCp: ", "\n");
764 print_SCp(arm_scsi_pointer(info->SCpnt), "Cmnd SCp: ", "\n");
765 return;
766 }
767
768 /*
769 * If we have a synchronous transfer agreement in effect, we must
770 * use DMA mode. If we are using asynchronous transfers, we may
771 * use DMA mode or PIO mode.
772 */
773 if (info->device[info->SCpnt->device->id].sof)
774 dmatype = fasdma_real_all;
775 else
776 dmatype = fasdma_pio;
777
778 if (info->scsi.phase == PHASE_DATAOUT)
779 direction = DMA_OUT;
780 else
781 direction = DMA_IN;
782
783 if (info->dma.setup)
784 dmatype = info->dma.setup(info->host, &info->scsi.SCp,
785 direction, dmatype);
786 info->dma.transfer_type = dmatype;
787
788 if (dmatype == fasdma_real_all)
789 fas216_set_stc(info, info->scsi.SCp.phase);
790 else
791 fas216_set_stc(info, info->scsi.SCp.this_residual);
792
793 switch (dmatype) {
794 case fasdma_pio:
795 fas216_log(info, LOG_BUFFER, "PIO transfer");
796 fas216_writeb(info, REG_SOF, 0);
797 fas216_writeb(info, REG_STP, info->scsi.async_stp);
798 fas216_cmd(info, CMD_TRANSFERINFO);
799 fas216_pio(info, direction);
800 break;
801
802 case fasdma_pseudo:
803 fas216_log(info, LOG_BUFFER, "pseudo transfer");
804 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
805 info->dma.pseudo(info->host, &info->scsi.SCp,
806 direction, info->SCpnt->transfersize);
807 break;
808
809 case fasdma_real_block:
810 fas216_log(info, LOG_BUFFER, "block dma transfer");
811 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
812 break;
813
814 case fasdma_real_all:
815 fas216_log(info, LOG_BUFFER, "total dma transfer");
816 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
817 break;
818
819 default:
820 fas216_log(info, LOG_BUFFER | LOG_ERROR,
821 "invalid FAS216 DMA type");
822 break;
823 }
824}
825
826/**
827 * fas216_stoptransfer - Stop a DMA transfer onto / off of the card
828 * @info: interface from which device disconnected from
829 *
830 * Called when we switch away from DATA IN or DATA OUT phases.
831 */
832static void fas216_stoptransfer(FAS216_Info *info)
833{
834 fas216_checkmagic(info);
835
836 if (info->dma.transfer_type == fasdma_real_all ||
837 info->dma.transfer_type == fasdma_real_block)
838 info->dma.stop(info->host, &info->scsi.SCp);
839
840 fas216_cleanuptransfer(info);
841
842 if (info->scsi.phase == PHASE_DATAIN) {
843 unsigned int fifo;
844
845 /*
846 * If we were performing Data-In, then the FIFO counter
847 * contains the number of bytes not transferred via DMA
848 * from the on-board FIFO. Read them manually.
849 */
850 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
851 while (fifo && info->scsi.SCp.ptr) {
852 *info->scsi.SCp.ptr = fas216_readb(info, REG_FF);
853 fas216_updateptrs(info, 1);
854 fifo--;
855 }
856 } else {
857 /*
858 * After a Data-Out phase, there may be unsent
859 * bytes left in the FIFO. Flush them out.
860 */
861 fas216_cmd(info, CMD_FLUSHFIFO);
862 }
863}
864
865static void fas216_aborttransfer(FAS216_Info *info)
866{
867 fas216_checkmagic(info);
868
869 if (info->dma.transfer_type == fasdma_real_all ||
870 info->dma.transfer_type == fasdma_real_block)
871 info->dma.stop(info->host, &info->scsi.SCp);
872
873 info->dma.transfer_type = fasdma_none;
874 fas216_cmd(info, CMD_FLUSHFIFO);
875}
876
877static void fas216_kick(FAS216_Info *info);
878
879/**
880 * fas216_disconnected_intr - handle device disconnection
881 * @info: interface from which device disconnected from
882 *
883 * Handle device disconnection
884 */
885static void fas216_disconnect_intr(FAS216_Info *info)
886{
887 unsigned long flags;
888
889 fas216_checkmagic(info);
890
891 fas216_log(info, LOG_CONNECT, "disconnect phase=%02x",
892 info->scsi.phase);
893
894 msgqueue_flush(&info->scsi.msgs);
895
896 switch (info->scsi.phase) {
897 case PHASE_SELECTION: /* while selecting - no target */
898 case PHASE_SELSTEPS:
899 fas216_done(info, DID_NO_CONNECT);
900 break;
901
902 case PHASE_MSGIN_DISCONNECT: /* message in - disconnecting */
903 info->scsi.disconnectable = 1;
904 info->scsi.phase = PHASE_IDLE;
905 info->stats.disconnects += 1;
906 spin_lock_irqsave(&info->host_lock, flags);
907 if (info->scsi.phase == PHASE_IDLE)
908 fas216_kick(info);
909 spin_unlock_irqrestore(&info->host_lock, flags);
910 break;
911
912 case PHASE_DONE: /* at end of command - complete */
913 fas216_done(info, DID_OK);
914 break;
915
916 case PHASE_MSGOUT: /* message out - possible ABORT message */
917 if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) {
918 info->scsi.aborting = 0;
919 fas216_done(info, DID_ABORT);
920 break;
921 }
922 fallthrough;
923
924 default: /* huh? */
925 printk(KERN_ERR "scsi%d.%c: unexpected disconnect in phase %s\n",
926 info->host->host_no, fas216_target(info), fas216_drv_phase(info));
927 print_debug_list();
928 fas216_stoptransfer(info);
929 fas216_done(info, DID_ERROR);
930 break;
931 }
932}
933
934/**
935 * fas216_reselected_intr - start reconnection of a device
936 * @info: interface which was reselected
937 *
938 * Start reconnection of a device
939 */
940static void
941fas216_reselected_intr(FAS216_Info *info)
942{
943 unsigned int cfis, i;
944 unsigned char msg[4];
945 unsigned char target, lun, tag;
946
947 fas216_checkmagic(info);
948
949 WARN_ON(info->scsi.phase == PHASE_SELECTION ||
950 info->scsi.phase == PHASE_SELSTEPS);
951
952 cfis = fas216_readb(info, REG_CFIS);
953
954 fas216_log(info, LOG_CONNECT, "reconnect phase=%02x cfis=%02x",
955 info->scsi.phase, cfis);
956
957 cfis &= CFIS_CF;
958
959 if (cfis < 2 || cfis > 4) {
960 printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n",
961 info->host->host_no);
962 goto bad_message;
963 }
964
965 for (i = 0; i < cfis; i++)
966 msg[i] = fas216_readb(info, REG_FF);
967
968 if (!(msg[0] & (1 << info->host->this_id)) ||
969 !(msg[1] & 0x80))
970 goto initiator_error;
971
972 target = msg[0] & ~(1 << info->host->this_id);
973 target = ffs(target) - 1;
974 lun = msg[1] & 7;
975 tag = 0;
976
977 if (cfis >= 3) {
978 if (msg[2] != SIMPLE_QUEUE_TAG)
979 goto initiator_error;
980
981 tag = msg[3];
982 }
983
984 /* set up for synchronous transfers */
985 fas216_writeb(info, REG_SDID, target);
986 fas216_set_sync(info, target);
987 msgqueue_flush(&info->scsi.msgs);
988
989 fas216_log(info, LOG_CONNECT, "Reconnected: target %1x lun %1x tag %02x",
990 target, lun, tag);
991
992 if (info->scsi.disconnectable && info->SCpnt) {
993 info->scsi.disconnectable = 0;
994 if (info->SCpnt->device->id == target &&
995 info->SCpnt->device->lun == lun &&
996 scsi_cmd_to_rq(info->SCpnt)->tag == tag) {
997 fas216_log(info, LOG_CONNECT, "reconnected previously executing command");
998 } else {
999 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
1000 fas216_log(info, LOG_CONNECT, "had to move command to disconnected queue");
1001 info->SCpnt = NULL;
1002 }
1003 }
1004 if (!info->SCpnt) {
1005 info->SCpnt = queue_remove_tgtluntag(&info->queues.disconnected,
1006 target, lun, tag);
1007 fas216_log(info, LOG_CONNECT, "had to get command");
1008 }
1009
1010 if (info->SCpnt) {
1011 /*
1012 * Restore data pointer from SAVED data pointer
1013 */
1014 info->scsi.SCp = *arm_scsi_pointer(info->SCpnt);
1015
1016 fas216_log(info, LOG_CONNECT, "data pointers: [%p, %X]",
1017 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1018 info->scsi.phase = PHASE_MSGIN;
1019 } else {
1020 /*
1021 * Our command structure not found - abort the
1022 * command on the target. Since we have no
1023 * record of this command, we can't send
1024 * an INITIATOR DETECTED ERROR message.
1025 */
1026 fas216_cmd(info, CMD_SETATN);
1027
1028#if 0
1029 if (tag)
1030 msgqueue_addmsg(&info->scsi.msgs, 2, ABORT_TAG, tag);
1031 else
1032#endif
1033 msgqueue_addmsg(&info->scsi.msgs, 1, ABORT);
1034 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1035 info->scsi.aborting = 1;
1036 }
1037
1038 fas216_cmd(info, CMD_MSGACCEPTED);
1039 return;
1040
1041 initiator_error:
1042 printk(KERN_ERR "scsi%d.H: error during reselection: bytes",
1043 info->host->host_no);
1044 for (i = 0; i < cfis; i++)
1045 printk(" %02x", msg[i]);
1046 printk("\n");
1047 bad_message:
1048 fas216_cmd(info, CMD_SETATN);
1049 msgqueue_flush(&info->scsi.msgs);
1050 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1051 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1052 fas216_cmd(info, CMD_MSGACCEPTED);
1053}
1054
1055static void fas216_parse_message(FAS216_Info *info, unsigned char *message, int msglen)
1056{
1057 struct scsi_pointer *scsi_pointer;
1058 int i;
1059
1060 switch (message[0]) {
1061 case COMMAND_COMPLETE:
1062 if (msglen != 1)
1063 goto unrecognised;
1064
1065 printk(KERN_ERR "scsi%d.%c: command complete with no "
1066 "status in MESSAGE_IN?\n",
1067 info->host->host_no, fas216_target(info));
1068 break;
1069
1070 case SAVE_POINTERS:
1071 if (msglen != 1)
1072 goto unrecognised;
1073
1074 /*
1075 * Save current data pointer to SAVED data pointer
1076 * SCSI II standard says that we must not acknowledge
1077 * this until we have really saved pointers.
1078 * NOTE: we DO NOT save the command nor status pointers
1079 * as required by the SCSI II standard. These always
1080 * point to the start of their respective areas.
1081 */
1082 scsi_pointer = arm_scsi_pointer(info->SCpnt);
1083 *scsi_pointer = info->scsi.SCp;
1084 scsi_pointer->sent_command = 0;
1085 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
1086 "save data pointers: [%p, %X]",
1087 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1088 break;
1089
1090 case RESTORE_POINTERS:
1091 if (msglen != 1)
1092 goto unrecognised;
1093
1094 /*
1095 * Restore current data pointer from SAVED data pointer
1096 */
1097 info->scsi.SCp = *arm_scsi_pointer(info->SCpnt);
1098 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
1099 "restore data pointers: [%p, 0x%x]",
1100 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1101 break;
1102
1103 case DISCONNECT:
1104 if (msglen != 1)
1105 goto unrecognised;
1106
1107 info->scsi.phase = PHASE_MSGIN_DISCONNECT;
1108 break;
1109
1110 case MESSAGE_REJECT:
1111 if (msglen != 1)
1112 goto unrecognised;
1113
1114 switch (fas216_get_last_msg(info, info->scsi.msgin_fifo)) {
1115 case EXTENDED_MESSAGE | EXTENDED_SDTR << 8:
1116 fas216_handlesync(info, message);
1117 break;
1118
1119 default:
1120 fas216_log(info, 0, "reject, last message 0x%04x",
1121 fas216_get_last_msg(info, info->scsi.msgin_fifo));
1122 }
1123 break;
1124
1125 case NOP:
1126 break;
1127
1128 case EXTENDED_MESSAGE:
1129 if (msglen < 3)
1130 goto unrecognised;
1131
1132 switch (message[2]) {
1133 case EXTENDED_SDTR: /* Sync transfer negotiation request/reply */
1134 fas216_handlesync(info, message);
1135 break;
1136
1137 default:
1138 goto unrecognised;
1139 }
1140 break;
1141
1142 default:
1143 goto unrecognised;
1144 }
1145 return;
1146
1147unrecognised:
1148 fas216_log(info, 0, "unrecognised message, rejecting");
1149 printk("scsi%d.%c: message was", info->host->host_no, fas216_target(info));
1150 for (i = 0; i < msglen; i++)
1151 printk("%s%02X", i & 31 ? " " : "\n ", message[i]);
1152 printk("\n");
1153
1154 /*
1155 * Something strange seems to be happening here -
1156 * I can't use SETATN since the chip gives me an
1157 * invalid command interrupt when I do. Weird.
1158 */
1159fas216_cmd(info, CMD_NOP);
1160fas216_dumpstate(info);
1161 fas216_cmd(info, CMD_SETATN);
1162 msgqueue_flush(&info->scsi.msgs);
1163 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
1164 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1165fas216_dumpstate(info);
1166}
1167
1168static int fas216_wait_cmd(FAS216_Info *info, int cmd)
1169{
1170 int tout;
1171 int stat;
1172
1173 fas216_cmd(info, cmd);
1174
1175 for (tout = 1000; tout; tout -= 1) {
1176 stat = fas216_readb(info, REG_STAT);
1177 if (stat & (STAT_INT|STAT_PARITYERROR))
1178 break;
1179 udelay(1);
1180 }
1181
1182 return stat;
1183}
1184
1185static int fas216_get_msg_byte(FAS216_Info *info)
1186{
1187 unsigned int stat = fas216_wait_cmd(info, CMD_MSGACCEPTED);
1188
1189 if ((stat & STAT_INT) == 0)
1190 goto timedout;
1191
1192 if ((stat & STAT_BUSMASK) != STAT_MESGIN)
1193 goto unexpected_phase_change;
1194
1195 fas216_readb(info, REG_INST);
1196
1197 stat = fas216_wait_cmd(info, CMD_TRANSFERINFO);
1198
1199 if ((stat & STAT_INT) == 0)
1200 goto timedout;
1201
1202 if (stat & STAT_PARITYERROR)
1203 goto parity_error;
1204
1205 if ((stat & STAT_BUSMASK) != STAT_MESGIN)
1206 goto unexpected_phase_change;
1207
1208 fas216_readb(info, REG_INST);
1209
1210 return fas216_readb(info, REG_FF);
1211
1212timedout:
1213 fas216_log(info, LOG_ERROR, "timed out waiting for message byte");
1214 return -1;
1215
1216unexpected_phase_change:
1217 fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat);
1218 return -2;
1219
1220parity_error:
1221 fas216_log(info, LOG_ERROR, "parity error during message in phase");
1222 return -3;
1223}
1224
1225/**
1226 * fas216_message - handle a function done interrupt from FAS216 chip
1227 * @info: interface which caused function done interrupt
1228 *
1229 * Handle a function done interrupt from FAS216 chip
1230 */
1231static void fas216_message(FAS216_Info *info)
1232{
1233 unsigned char *message = info->scsi.message;
1234 unsigned int msglen = 1;
1235 int msgbyte = 0;
1236
1237 fas216_checkmagic(info);
1238
1239 message[0] = fas216_readb(info, REG_FF);
1240
1241 if (message[0] == EXTENDED_MESSAGE) {
1242 msgbyte = fas216_get_msg_byte(info);
1243
1244 if (msgbyte >= 0) {
1245 message[1] = msgbyte;
1246
1247 for (msglen = 2; msglen < message[1] + 2; msglen++) {
1248 msgbyte = fas216_get_msg_byte(info);
1249
1250 if (msgbyte >= 0)
1251 message[msglen] = msgbyte;
1252 else
1253 break;
1254 }
1255 }
1256 }
1257
1258 if (msgbyte == -3)
1259 goto parity_error;
1260
1261#ifdef DEBUG_MESSAGES
1262 {
1263 int i;
1264
1265 printk("scsi%d.%c: message in: ",
1266 info->host->host_no, fas216_target(info));
1267 for (i = 0; i < msglen; i++)
1268 printk("%02X ", message[i]);
1269 printk("\n");
1270 }
1271#endif
1272
1273 fas216_parse_message(info, message, msglen);
1274 fas216_cmd(info, CMD_MSGACCEPTED);
1275 return;
1276
1277parity_error:
1278 fas216_cmd(info, CMD_SETATN);
1279 msgqueue_flush(&info->scsi.msgs);
1280 msgqueue_addmsg(&info->scsi.msgs, 1, MSG_PARITY_ERROR);
1281 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1282 fas216_cmd(info, CMD_MSGACCEPTED);
1283 return;
1284}
1285
1286/**
1287 * fas216_send_command - send command after all message bytes have been sent
1288 * @info: interface which caused bus service
1289 *
1290 * Send a command to a target after all message bytes have been sent
1291 */
1292static void fas216_send_command(FAS216_Info *info)
1293{
1294 int i;
1295
1296 fas216_checkmagic(info);
1297
1298 fas216_cmd(info, CMD_NOP|CMD_WITHDMA);
1299 fas216_cmd(info, CMD_FLUSHFIFO);
1300
1301 /* load command */
1302 for (i = info->scsi.SCp.sent_command; i < info->SCpnt->cmd_len; i++)
1303 fas216_writeb(info, REG_FF, info->SCpnt->cmnd[i]);
1304
1305 fas216_cmd(info, CMD_TRANSFERINFO);
1306
1307 info->scsi.phase = PHASE_COMMAND;
1308}
1309
1310/**
1311 * fas216_send_messageout - handle bus service to send a message
1312 * @info: interface which caused bus service
1313 *
1314 * Handle bus service to send a message.
1315 * Note: We do not allow the device to change the data direction!
1316 */
1317static void fas216_send_messageout(FAS216_Info *info, int start)
1318{
1319 unsigned int tot_msglen = msgqueue_msglength(&info->scsi.msgs);
1320
1321 fas216_checkmagic(info);
1322
1323 fas216_cmd(info, CMD_FLUSHFIFO);
1324
1325 if (tot_msglen) {
1326 struct message *msg;
1327 int msgnr = 0;
1328
1329 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1330 int i;
1331
1332 for (i = start; i < msg->length; i++)
1333 fas216_writeb(info, REG_FF, msg->msg[i]);
1334
1335 msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
1336 start = 0;
1337 }
1338 } else
1339 fas216_writeb(info, REG_FF, NOP);
1340
1341 fas216_cmd(info, CMD_TRANSFERINFO);
1342
1343 info->scsi.phase = PHASE_MSGOUT;
1344}
1345
1346/**
1347 * fas216_busservice_intr - handle bus service interrupt from FAS216 chip
1348 * @info: interface which caused bus service interrupt
1349 * @stat: Status register contents
1350 * @is: SCSI Status register contents
1351 *
1352 * Handle a bus service interrupt from FAS216 chip
1353 */
1354static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
1355{
1356 fas216_checkmagic(info);
1357
1358 fas216_log(info, LOG_BUSSERVICE,
1359 "bus service: stat=%02x is=%02x phase=%02x",
1360 stat, is, info->scsi.phase);
1361
1362 switch (info->scsi.phase) {
1363 case PHASE_SELECTION:
1364 if ((is & IS_BITS) != IS_MSGBYTESENT)
1365 goto bad_is;
1366 break;
1367
1368 case PHASE_SELSTEPS:
1369 switch (is & IS_BITS) {
1370 case IS_SELARB:
1371 case IS_MSGBYTESENT:
1372 goto bad_is;
1373
1374 case IS_NOTCOMMAND:
1375 case IS_EARLYPHASE:
1376 if ((stat & STAT_BUSMASK) == STAT_MESGIN)
1377 break;
1378 goto bad_is;
1379
1380 case IS_COMPLETE:
1381 break;
1382 }
1383 break;
1384
1385 default:
1386 break;
1387 }
1388
1389 fas216_cmd(info, CMD_NOP);
1390
1391#define STATE(st,ph) ((ph) << 3 | (st))
1392 /* This table describes the legal SCSI state transitions,
1393 * as described by the SCSI II spec.
1394 */
1395 switch (STATE(stat & STAT_BUSMASK, info->scsi.phase)) {
1396 case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In */
1397 case STATE(STAT_DATAIN, PHASE_MSGOUT): /* Message Out -> Data In */
1398 case STATE(STAT_DATAIN, PHASE_COMMAND): /* Command -> Data In */
1399 case STATE(STAT_DATAIN, PHASE_MSGIN): /* Message In -> Data In */
1400 info->scsi.phase = PHASE_DATAIN;
1401 fas216_transfer(info);
1402 return;
1403
1404 case STATE(STAT_DATAIN, PHASE_DATAIN): /* Data In -> Data In */
1405 case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out -> Data Out */
1406 fas216_cleanuptransfer(info);
1407 fas216_transfer(info);
1408 return;
1409
1410 case STATE(STAT_DATAOUT, PHASE_SELSTEPS):/* Sel w/ steps-> Data Out */
1411 case STATE(STAT_DATAOUT, PHASE_MSGOUT): /* Message Out -> Data Out */
1412 case STATE(STAT_DATAOUT, PHASE_COMMAND):/* Command -> Data Out */
1413 case STATE(STAT_DATAOUT, PHASE_MSGIN): /* Message In -> Data Out */
1414 fas216_cmd(info, CMD_FLUSHFIFO);
1415 info->scsi.phase = PHASE_DATAOUT;
1416 fas216_transfer(info);
1417 return;
1418
1419 case STATE(STAT_STATUS, PHASE_DATAOUT): /* Data Out -> Status */
1420 case STATE(STAT_STATUS, PHASE_DATAIN): /* Data In -> Status */
1421 fas216_stoptransfer(info);
1422 fallthrough;
1423
1424 case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status */
1425 case STATE(STAT_STATUS, PHASE_MSGOUT): /* Message Out -> Status */
1426 case STATE(STAT_STATUS, PHASE_COMMAND): /* Command -> Status */
1427 case STATE(STAT_STATUS, PHASE_MSGIN): /* Message In -> Status */
1428 fas216_cmd(info, CMD_INITCMDCOMPLETE);
1429 info->scsi.phase = PHASE_STATUS;
1430 return;
1431
1432 case STATE(STAT_MESGIN, PHASE_DATAOUT): /* Data Out -> Message In */
1433 case STATE(STAT_MESGIN, PHASE_DATAIN): /* Data In -> Message In */
1434 fas216_stoptransfer(info);
1435 fallthrough;
1436
1437 case STATE(STAT_MESGIN, PHASE_COMMAND): /* Command -> Message In */
1438 case STATE(STAT_MESGIN, PHASE_SELSTEPS):/* Sel w/ steps -> Message In */
1439 case STATE(STAT_MESGIN, PHASE_MSGOUT): /* Message Out -> Message In */
1440 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1441 fas216_cmd(info, CMD_FLUSHFIFO);
1442 fas216_cmd(info, CMD_TRANSFERINFO);
1443 info->scsi.phase = PHASE_MSGIN;
1444 return;
1445
1446 case STATE(STAT_MESGIN, PHASE_MSGIN):
1447 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1448 fas216_cmd(info, CMD_TRANSFERINFO);
1449 return;
1450
1451 case STATE(STAT_COMMAND, PHASE_MSGOUT): /* Message Out -> Command */
1452 case STATE(STAT_COMMAND, PHASE_MSGIN): /* Message In -> Command */
1453 fas216_send_command(info);
1454 info->scsi.phase = PHASE_COMMAND;
1455 return;
1456
1457
1458 /*
1459 * Selection -> Message Out
1460 */
1461 case STATE(STAT_MESGOUT, PHASE_SELECTION):
1462 fas216_send_messageout(info, 1);
1463 return;
1464
1465 /*
1466 * Message Out -> Message Out
1467 */
1468 case STATE(STAT_MESGOUT, PHASE_SELSTEPS):
1469 case STATE(STAT_MESGOUT, PHASE_MSGOUT):
1470 /*
1471 * If we get another message out phase, this usually
1472 * means some parity error occurred. Resend complete
1473 * set of messages. If we have more than one byte to
1474 * send, we need to assert ATN again.
1475 */
1476 if (info->device[info->SCpnt->device->id].parity_check) {
1477 /*
1478 * We were testing... good, the device
1479 * supports parity checking.
1480 */
1481 info->device[info->SCpnt->device->id].parity_check = 0;
1482 info->device[info->SCpnt->device->id].parity_enabled = 1;
1483 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1484 }
1485
1486 if (msgqueue_msglength(&info->scsi.msgs) > 1)
1487 fas216_cmd(info, CMD_SETATN);
1488 fallthrough;
1489
1490 /*
1491 * Any -> Message Out
1492 */
1493 case STATE(STAT_MESGOUT, PHASE_MSGOUT_EXPECT):
1494 fas216_send_messageout(info, 0);
1495 return;
1496
1497 /* Error recovery rules.
1498 * These either attempt to abort or retry the operation.
1499 * TODO: we need more of these
1500 */
1501 case STATE(STAT_COMMAND, PHASE_COMMAND):/* Command -> Command */
1502 /* error - we've sent out all the command bytes
1503 * we have.
1504 * NOTE: we need SAVE DATA POINTERS/RESTORE DATA POINTERS
1505 * to include the command bytes sent for this to work
1506 * correctly.
1507 */
1508 printk(KERN_ERR "scsi%d.%c: "
1509 "target trying to receive more command bytes\n",
1510 info->host->host_no, fas216_target(info));
1511 fas216_cmd(info, CMD_SETATN);
1512 fas216_set_stc(info, 15);
1513 fas216_cmd(info, CMD_PADBYTES | CMD_WITHDMA);
1514 msgqueue_flush(&info->scsi.msgs);
1515 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1516 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1517 return;
1518 }
1519
1520 if (info->scsi.phase == PHASE_MSGIN_DISCONNECT) {
1521 printk(KERN_ERR "scsi%d.%c: disconnect message received, but bus service %s?\n",
1522 info->host->host_no, fas216_target(info),
1523 fas216_bus_phase(stat));
1524 msgqueue_flush(&info->scsi.msgs);
1525 fas216_cmd(info, CMD_SETATN);
1526 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1527 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1528 info->scsi.aborting = 1;
1529 fas216_cmd(info, CMD_TRANSFERINFO);
1530 return;
1531 }
1532 printk(KERN_ERR "scsi%d.%c: bus phase %s after %s?\n",
1533 info->host->host_no, fas216_target(info),
1534 fas216_bus_phase(stat),
1535 fas216_drv_phase(info));
1536 print_debug_list();
1537 return;
1538
1539bad_is:
1540 fas216_log(info, 0, "bus service at step %d?", is & IS_BITS);
1541 fas216_dumpstate(info);
1542 print_debug_list();
1543
1544 fas216_done(info, DID_ERROR);
1545}
1546
1547/**
1548 * fas216_funcdone_intr - handle a function done interrupt from FAS216 chip
1549 * @info: interface which caused function done interrupt
1550 * @stat: Status register contents
1551 * @is: SCSI Status register contents
1552 *
1553 * Handle a function done interrupt from FAS216 chip
1554 */
1555static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
1556{
1557 unsigned int fifo_len = fas216_readb(info, REG_CFIS) & CFIS_CF;
1558
1559 fas216_checkmagic(info);
1560
1561 fas216_log(info, LOG_FUNCTIONDONE,
1562 "function done: stat=%02x is=%02x phase=%02x",
1563 stat, is, info->scsi.phase);
1564
1565 switch (info->scsi.phase) {
1566 case PHASE_STATUS: /* status phase - read status and msg */
1567 if (fifo_len != 2) {
1568 fas216_log(info, 0, "odd number of bytes in FIFO: %d", fifo_len);
1569 }
1570 /*
1571 * Read status then message byte.
1572 */
1573 info->scsi.SCp.Status = fas216_readb(info, REG_FF);
1574 info->scsi.SCp.Message = fas216_readb(info, REG_FF);
1575 info->scsi.phase = PHASE_DONE;
1576 fas216_cmd(info, CMD_MSGACCEPTED);
1577 break;
1578
1579 case PHASE_IDLE:
1580 case PHASE_SELECTION:
1581 case PHASE_SELSTEPS:
1582 break;
1583
1584 case PHASE_MSGIN: /* message in phase */
1585 if ((stat & STAT_BUSMASK) == STAT_MESGIN) {
1586 info->scsi.msgin_fifo = fifo_len;
1587 fas216_message(info);
1588 break;
1589 }
1590 fallthrough;
1591
1592 default:
1593 fas216_log(info, 0, "internal phase %s for function done?"
1594 " What do I do with this?",
1595 fas216_target(info), fas216_drv_phase(info));
1596 }
1597}
1598
1599static void fas216_bus_reset(FAS216_Info *info)
1600{
1601 neg_t sync_state;
1602 int i;
1603
1604 msgqueue_flush(&info->scsi.msgs);
1605
1606 sync_state = neg_invalid;
1607
1608#ifdef SCSI2_SYNC
1609 if (info->ifcfg.capabilities & (FASCAP_DMA|FASCAP_PSEUDODMA))
1610 sync_state = neg_wait;
1611#endif
1612
1613 info->scsi.phase = PHASE_IDLE;
1614 info->SCpnt = NULL; /* bug! */
1615 memset(&info->scsi.SCp, 0, sizeof(info->scsi.SCp));
1616
1617 for (i = 0; i < 8; i++) {
1618 info->device[i].disconnect_ok = info->ifcfg.disconnect_ok;
1619 info->device[i].sync_state = sync_state;
1620 info->device[i].period = info->ifcfg.asyncperiod / 4;
1621 info->device[i].stp = info->scsi.async_stp;
1622 info->device[i].sof = 0;
1623 info->device[i].wide_xfer = 0;
1624 }
1625
1626 info->rst_bus_status = 1;
1627 wake_up(&info->eh_wait);
1628}
1629
1630/**
1631 * fas216_intr - handle interrupts to progress a command
1632 * @info: interface to service
1633 *
1634 * Handle interrupts from the interface to progress a command
1635 */
1636irqreturn_t fas216_intr(FAS216_Info *info)
1637{
1638 unsigned char inst, is, stat;
1639 int handled = IRQ_NONE;
1640
1641 fas216_checkmagic(info);
1642
1643 stat = fas216_readb(info, REG_STAT);
1644 is = fas216_readb(info, REG_IS);
1645 inst = fas216_readb(info, REG_INST);
1646
1647 add_debug_list(stat, is, inst, info->scsi.phase);
1648
1649 if (stat & STAT_INT) {
1650 if (inst & INST_BUSRESET) {
1651 fas216_log(info, 0, "bus reset detected");
1652 fas216_bus_reset(info);
1653 scsi_report_bus_reset(info->host, 0);
1654 } else if (inst & INST_ILLEGALCMD) {
1655 fas216_log(info, LOG_ERROR, "illegal command given\n");
1656 fas216_dumpstate(info);
1657 print_debug_list();
1658 } else if (inst & INST_DISCONNECT)
1659 fas216_disconnect_intr(info);
1660 else if (inst & INST_RESELECTED) /* reselected */
1661 fas216_reselected_intr(info);
1662 else if (inst & INST_BUSSERVICE) /* bus service request */
1663 fas216_busservice_intr(info, stat, is);
1664 else if (inst & INST_FUNCDONE) /* function done */
1665 fas216_funcdone_intr(info, stat, is);
1666 else
1667 fas216_log(info, 0, "unknown interrupt received:"
1668 " phase %s inst %02X is %02X stat %02X",
1669 fas216_drv_phase(info), inst, is, stat);
1670 handled = IRQ_HANDLED;
1671 }
1672 return handled;
1673}
1674
1675static void __fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1676{
1677 int tot_msglen;
1678
1679 /* following what the ESP driver says */
1680 fas216_set_stc(info, 0);
1681 fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1682
1683 /* flush FIFO */
1684 fas216_cmd(info, CMD_FLUSHFIFO);
1685
1686 /* load bus-id and timeout */
1687 fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1688 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1689
1690 /* synchronous transfers */
1691 fas216_set_sync(info, SCpnt->device->id);
1692
1693 tot_msglen = msgqueue_msglength(&info->scsi.msgs);
1694
1695#ifdef DEBUG_MESSAGES
1696 {
1697 struct message *msg;
1698 int msgnr = 0, i;
1699
1700 printk("scsi%d.%c: message out: ",
1701 info->host->host_no, '0' + SCpnt->device->id);
1702 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1703 printk("{ ");
1704 for (i = 0; i < msg->length; i++)
1705 printk("%02x ", msg->msg[i]);
1706 printk("} ");
1707 }
1708 printk("\n");
1709 }
1710#endif
1711
1712 if (tot_msglen == 1 || tot_msglen == 3) {
1713 /*
1714 * We have an easy message length to send...
1715 */
1716 struct message *msg;
1717 int msgnr = 0, i;
1718
1719 info->scsi.phase = PHASE_SELSTEPS;
1720
1721 /* load message bytes */
1722 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1723 for (i = 0; i < msg->length; i++)
1724 fas216_writeb(info, REG_FF, msg->msg[i]);
1725 msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
1726 }
1727
1728 /* load command */
1729 for (i = 0; i < SCpnt->cmd_len; i++)
1730 fas216_writeb(info, REG_FF, SCpnt->cmnd[i]);
1731
1732 if (tot_msglen == 1)
1733 fas216_cmd(info, CMD_SELECTATN);
1734 else
1735 fas216_cmd(info, CMD_SELECTATN3);
1736 } else {
1737 /*
1738 * We have an unusual number of message bytes to send.
1739 * Load first byte into fifo, and issue SELECT with ATN and
1740 * stop steps.
1741 */
1742 struct message *msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1743
1744 fas216_writeb(info, REG_FF, msg->msg[0]);
1745 msg->fifo = 1;
1746
1747 fas216_cmd(info, CMD_SELECTATNSTOP);
1748 }
1749}
1750
1751/*
1752 * Decide whether we need to perform a parity test on this device.
1753 * Can also be used to force parity error conditions during initial
1754 * information transfer phase (message out) for test purposes.
1755 */
1756static int parity_test(FAS216_Info *info, int target)
1757{
1758#if 0
1759 if (target == 3) {
1760 info->device[target].parity_check = 0;
1761 return 1;
1762 }
1763#endif
1764 return info->device[target].parity_check;
1765}
1766
1767static void fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1768{
1769 int disconnect_ok;
1770
1771 /*
1772 * claim host busy
1773 */
1774 info->scsi.phase = PHASE_SELECTION;
1775 info->scsi.SCp = *arm_scsi_pointer(SCpnt);
1776 info->SCpnt = SCpnt;
1777 info->dma.transfer_type = fasdma_none;
1778
1779 if (parity_test(info, SCpnt->device->id))
1780 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_PTE);
1781 else
1782 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1783
1784 /*
1785 * Don't allow request sense commands to disconnect.
1786 */
1787 disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE &&
1788 info->device[SCpnt->device->id].disconnect_ok;
1789
1790 /*
1791 * build outgoing message bytes
1792 */
1793 msgqueue_flush(&info->scsi.msgs);
1794 msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->device->lun));
1795
1796 /*
1797 * add tag message if required
1798 */
1799 if (SCpnt->device->simple_tags)
1800 msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG,
1801 scsi_cmd_to_rq(SCpnt)->tag);
1802
1803 do {
1804#ifdef SCSI2_SYNC
1805 if ((info->device[SCpnt->device->id].sync_state == neg_wait ||
1806 info->device[SCpnt->device->id].sync_state == neg_complete) &&
1807 (SCpnt->cmnd[0] == REQUEST_SENSE ||
1808 SCpnt->cmnd[0] == INQUIRY)) {
1809 info->device[SCpnt->device->id].sync_state = neg_inprogress;
1810 msgqueue_addmsg(&info->scsi.msgs, 5,
1811 EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
1812 1000 / info->ifcfg.clockrate,
1813 info->ifcfg.sync_max_depth);
1814 break;
1815 }
1816#endif
1817 } while (0);
1818
1819 __fas216_start_command(info, SCpnt);
1820}
1821
1822static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1823{
1824 set_bit(SCpnt->device->id * 8 +
1825 (u8)(SCpnt->device->lun & 0x7), info->busyluns);
1826
1827 info->stats.removes += 1;
1828 switch (SCpnt->cmnd[0]) {
1829 case WRITE_6:
1830 case WRITE_10:
1831 case WRITE_12:
1832 info->stats.writes += 1;
1833 break;
1834 case READ_6:
1835 case READ_10:
1836 case READ_12:
1837 info->stats.reads += 1;
1838 break;
1839 default:
1840 info->stats.miscs += 1;
1841 break;
1842 }
1843}
1844
1845static void fas216_do_bus_device_reset(FAS216_Info *info,
1846 struct scsi_cmnd *SCpnt)
1847{
1848 struct message *msg;
1849
1850 /*
1851 * claim host busy
1852 */
1853 info->scsi.phase = PHASE_SELECTION;
1854 info->scsi.SCp = *arm_scsi_pointer(SCpnt);
1855 info->SCpnt = SCpnt;
1856 info->dma.transfer_type = fasdma_none;
1857
1858 fas216_log(info, LOG_ERROR, "sending bus device reset");
1859
1860 msgqueue_flush(&info->scsi.msgs);
1861 msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET);
1862
1863 /* following what the ESP driver says */
1864 fas216_set_stc(info, 0);
1865 fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1866
1867 /* flush FIFO */
1868 fas216_cmd(info, CMD_FLUSHFIFO);
1869
1870 /* load bus-id and timeout */
1871 fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1872 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1873
1874 /* synchronous transfers */
1875 fas216_set_sync(info, SCpnt->device->id);
1876
1877 msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1878
1879 fas216_writeb(info, REG_FF, BUS_DEVICE_RESET);
1880 msg->fifo = 1;
1881
1882 fas216_cmd(info, CMD_SELECTATNSTOP);
1883}
1884
1885/**
1886 * fas216_kick - kick a command to the interface
1887 * @info: our host interface to kick
1888 *
1889 * Kick a command to the interface, interface should be idle.
1890 * Notes: Interrupts are always disabled!
1891 */
1892static void fas216_kick(FAS216_Info *info)
1893{
1894 struct scsi_cmnd *SCpnt = NULL;
1895#define TYPE_OTHER 0
1896#define TYPE_RESET 1
1897#define TYPE_QUEUE 2
1898 int where_from = TYPE_OTHER;
1899
1900 fas216_checkmagic(info);
1901
1902 /*
1903 * Obtain the next command to process.
1904 */
1905 do {
1906 if (info->rstSCpnt) {
1907 SCpnt = info->rstSCpnt;
1908 /* don't remove it */
1909 where_from = TYPE_RESET;
1910 break;
1911 }
1912
1913 if (info->reqSCpnt) {
1914 SCpnt = info->reqSCpnt;
1915 info->reqSCpnt = NULL;
1916 break;
1917 }
1918
1919 if (info->origSCpnt) {
1920 SCpnt = info->origSCpnt;
1921 info->origSCpnt = NULL;
1922 break;
1923 }
1924
1925 /* retrieve next command */
1926 if (!SCpnt) {
1927 SCpnt = queue_remove_exclude(&info->queues.issue,
1928 info->busyluns);
1929 where_from = TYPE_QUEUE;
1930 break;
1931 }
1932 } while (0);
1933
1934 if (!SCpnt) {
1935 /*
1936 * no command pending, so enable reselection.
1937 */
1938 fas216_cmd(info, CMD_ENABLESEL);
1939 return;
1940 }
1941
1942 /*
1943 * We're going to start a command, so disable reselection
1944 */
1945 fas216_cmd(info, CMD_DISABLESEL);
1946
1947 if (info->scsi.disconnectable && info->SCpnt) {
1948 fas216_log(info, LOG_CONNECT,
1949 "moved command for %d to disconnected queue",
1950 info->SCpnt->device->id);
1951 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
1952 info->scsi.disconnectable = 0;
1953 info->SCpnt = NULL;
1954 }
1955
1956 fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt,
1957 "starting");
1958
1959 switch (where_from) {
1960 case TYPE_QUEUE:
1961 fas216_allocate_tag(info, SCpnt);
1962 fallthrough;
1963 case TYPE_OTHER:
1964 fas216_start_command(info, SCpnt);
1965 break;
1966 case TYPE_RESET:
1967 fas216_do_bus_device_reset(info, SCpnt);
1968 break;
1969 }
1970
1971 fas216_log(info, LOG_CONNECT, "select: data pointers [%p, %X]",
1972 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1973
1974 /*
1975 * should now get either DISCONNECT or
1976 * (FUNCTION DONE with BUS SERVICE) interrupt
1977 */
1978}
1979
1980/*
1981 * Clean up from issuing a BUS DEVICE RESET message to a device.
1982 */
1983static void fas216_devicereset_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
1984 unsigned int result)
1985{
1986 fas216_log(info, LOG_ERROR, "fas216 device reset complete");
1987
1988 info->rstSCpnt = NULL;
1989 info->rst_dev_status = 1;
1990 wake_up(&info->eh_wait);
1991}
1992
1993/**
1994 * fas216_rq_sns_done - Finish processing automatic request sense command
1995 * @info: interface that completed
1996 * @SCpnt: command that completed
1997 * @result: driver byte of result
1998 *
1999 * Finish processing automatic request sense command
2000 */
2001static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
2002 unsigned int result)
2003{
2004 struct scsi_pointer *scsi_pointer = arm_scsi_pointer(SCpnt);
2005
2006 fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
2007 "request sense complete, result=0x%04x%02x%02x",
2008 result, scsi_pointer->Message, scsi_pointer->Status);
2009
2010 if (result != DID_OK || scsi_pointer->Status != SAM_STAT_GOOD)
2011 /*
2012 * Something went wrong. Make sure that we don't
2013 * have valid data in the sense buffer that could
2014 * confuse the higher levels.
2015 */
2016 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2017//printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id);
2018//{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); }
2019 /*
2020 * Note that we don't set SCpnt->result, since that should
2021 * reflect the status of the command that we were asked by
2022 * the upper layers to process. This would have been set
2023 * correctly by fas216_std_done.
2024 */
2025 scsi_eh_restore_cmnd(SCpnt, &info->ses);
2026 fas216_cmd_priv(SCpnt)->scsi_done(SCpnt);
2027}
2028
2029/**
2030 * fas216_std_done - finish processing of standard command
2031 * @info: interface that completed
2032 * @SCpnt: command that completed
2033 * @result: driver byte of result
2034 *
2035 * Finish processing of standard command
2036 */
2037static void
2038fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result)
2039{
2040 struct scsi_pointer *scsi_pointer = arm_scsi_pointer(SCpnt);
2041
2042 info->stats.fins += 1;
2043
2044 set_host_byte(SCpnt, result);
2045 if (result == DID_OK)
2046 scsi_msg_to_host_byte(SCpnt, info->scsi.SCp.Message);
2047 set_status_byte(SCpnt, info->scsi.SCp.Status);
2048
2049 fas216_log_command(info, LOG_CONNECT, SCpnt,
2050 "command complete, result=0x%08x", SCpnt->result);
2051
2052 /*
2053 * If the driver detected an error, we're all done.
2054 */
2055 if (get_host_byte(SCpnt) != DID_OK)
2056 goto done;
2057
2058 /*
2059 * If the command returned CHECK_CONDITION or COMMAND_TERMINATED
2060 * status, request the sense information.
2061 */
2062 if (get_status_byte(SCpnt) == SAM_STAT_CHECK_CONDITION ||
2063 get_status_byte(SCpnt) == SAM_STAT_COMMAND_TERMINATED)
2064 goto request_sense;
2065
2066 /*
2067 * If the command did not complete with GOOD status,
2068 * we are all done here.
2069 */
2070 if (get_status_byte(SCpnt) != SAM_STAT_GOOD)
2071 goto done;
2072
2073 /*
2074 * We have successfully completed a command. Make sure that
2075 * we do not have any buffers left to transfer. The world
2076 * is not perfect, and we seem to occasionally hit this.
2077 * It can be indicative of a buggy driver, target or the upper
2078 * levels of the SCSI code.
2079 */
2080 if (info->scsi.SCp.ptr) {
2081 switch (SCpnt->cmnd[0]) {
2082 case INQUIRY:
2083 case START_STOP:
2084 case MODE_SENSE:
2085 break;
2086
2087 default:
2088 scmd_printk(KERN_ERR, SCpnt,
2089 "incomplete data transfer detected: res=%08X ptr=%p len=%X\n",
2090 SCpnt->result, info->scsi.SCp.ptr,
2091 info->scsi.SCp.this_residual);
2092 scsi_print_command(SCpnt);
2093 set_host_byte(SCpnt, DID_ERROR);
2094 goto request_sense;
2095 }
2096 }
2097
2098done:
2099 if (fas216_cmd_priv(SCpnt)->scsi_done) {
2100 fas216_cmd_priv(SCpnt)->scsi_done(SCpnt);
2101 return;
2102 }
2103
2104 panic("scsi%d.H: null scsi_done function in fas216_done",
2105 info->host->host_no);
2106
2107
2108request_sense:
2109 if (SCpnt->cmnd[0] == REQUEST_SENSE)
2110 goto done;
2111
2112 scsi_eh_prep_cmnd(SCpnt, &info->ses, NULL, 0, ~0);
2113 fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
2114 "requesting sense");
2115 init_SCp(SCpnt);
2116 scsi_pointer->Message = 0;
2117 scsi_pointer->Status = 0;
2118 SCpnt->host_scribble = (void *)fas216_rq_sns_done;
2119
2120 /*
2121 * Place this command into the high priority "request
2122 * sense" slot. This will be the very next command
2123 * executed, unless a target connects to us.
2124 */
2125 if (info->reqSCpnt)
2126 printk(KERN_WARNING "scsi%d.%c: losing request command\n",
2127 info->host->host_no, '0' + SCpnt->device->id);
2128 info->reqSCpnt = SCpnt;
2129}
2130
2131/**
2132 * fas216_done - complete processing for current command
2133 * @info: interface that completed
2134 * @result: driver byte of result
2135 *
2136 * Complete processing for current command
2137 */
2138static void fas216_done(FAS216_Info *info, unsigned int result)
2139{
2140 void (*fn)(FAS216_Info *, struct scsi_cmnd *, unsigned int);
2141 struct scsi_cmnd *SCpnt;
2142 unsigned long flags;
2143
2144 fas216_checkmagic(info);
2145
2146 if (!info->SCpnt)
2147 goto no_command;
2148
2149 SCpnt = info->SCpnt;
2150 info->SCpnt = NULL;
2151 info->scsi.phase = PHASE_IDLE;
2152
2153 if (info->scsi.aborting) {
2154 fas216_log(info, 0, "uncaught abort - returning DID_ABORT");
2155 result = DID_ABORT;
2156 info->scsi.aborting = 0;
2157 }
2158
2159 /*
2160 * Sanity check the completion - if we have zero bytes left
2161 * to transfer, we should not have a valid pointer.
2162 */
2163 if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) {
2164 scmd_printk(KERN_INFO, SCpnt,
2165 "zero bytes left to transfer, but buffer pointer still valid: ptr=%p len=%08x\n",
2166 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
2167 info->scsi.SCp.ptr = NULL;
2168 scsi_print_command(SCpnt);
2169 }
2170
2171 /*
2172 * Clear down this command as completed. If we need to request
2173 * the sense information, fas216_kick will re-assert the busy
2174 * status.
2175 */
2176 info->device[SCpnt->device->id].parity_check = 0;
2177 clear_bit(SCpnt->device->id * 8 +
2178 (u8)(SCpnt->device->lun & 0x7), info->busyluns);
2179
2180 fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble;
2181 fn(info, SCpnt, result);
2182
2183 if (info->scsi.irq) {
2184 spin_lock_irqsave(&info->host_lock, flags);
2185 if (info->scsi.phase == PHASE_IDLE)
2186 fas216_kick(info);
2187 spin_unlock_irqrestore(&info->host_lock, flags);
2188 }
2189 return;
2190
2191no_command:
2192 panic("scsi%d.H: null command in fas216_done",
2193 info->host->host_no);
2194}
2195
2196/**
2197 * fas216_queue_command_internal - queue a command for the adapter to process
2198 * @SCpnt: Command to queue
2199 * @done: done function to call once command is complete
2200 *
2201 * Queue a command for adapter to process.
2202 * Returns: 0 on success, else error.
2203 * Notes: io_request_lock is held, interrupts are disabled.
2204 */
2205static int fas216_queue_command_internal(struct scsi_cmnd *SCpnt,
2206 void (*done)(struct scsi_cmnd *))
2207{
2208 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2209 int result;
2210
2211 fas216_checkmagic(info);
2212
2213 fas216_log_command(info, LOG_CONNECT, SCpnt,
2214 "received command (%p)", SCpnt);
2215
2216 fas216_cmd_priv(SCpnt)->scsi_done = done;
2217 SCpnt->host_scribble = (void *)fas216_std_done;
2218 SCpnt->result = 0;
2219
2220 init_SCp(SCpnt);
2221
2222 info->stats.queues += 1;
2223
2224 spin_lock(&info->host_lock);
2225
2226 /*
2227 * Add command into execute queue and let it complete under
2228 * whatever scheme we're using.
2229 */
2230 result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt);
2231
2232 /*
2233 * If we successfully added the command,
2234 * kick the interface to get it moving.
2235 */
2236 if (result == 0 && info->scsi.phase == PHASE_IDLE)
2237 fas216_kick(info);
2238 spin_unlock(&info->host_lock);
2239
2240 fas216_log_target(info, LOG_CONNECT, -1, "queue %s",
2241 result ? "failure" : "success");
2242
2243 return result;
2244}
2245
2246static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt)
2247{
2248 return fas216_queue_command_internal(SCpnt, scsi_done);
2249}
2250
2251DEF_SCSI_QCMD(fas216_queue_command)
2252
2253/**
2254 * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command
2255 * @SCpnt: Command to wake
2256 *
2257 * Trigger restart of a waiting thread in fas216_command
2258 */
2259static void fas216_internal_done(struct scsi_cmnd *SCpnt)
2260{
2261 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2262
2263 fas216_checkmagic(info);
2264
2265 info->internal_done = 1;
2266}
2267
2268/**
2269 * fas216_noqueue_command - process a command for the adapter.
2270 * @SCpnt: Command to queue
2271 *
2272 * Queue a command for adapter to process.
2273 * Returns: scsi result code.
2274 * Notes: io_request_lock is held, interrupts are disabled.
2275 */
2276static int fas216_noqueue_command_lck(struct scsi_cmnd *SCpnt)
2277{
2278 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2279
2280 fas216_checkmagic(info);
2281
2282 /*
2283 * We should only be using this if we don't have an interrupt.
2284 * Provide some "incentive" to use the queueing code.
2285 */
2286 BUG_ON(info->scsi.irq);
2287
2288 info->internal_done = 0;
2289 fas216_queue_command_internal(SCpnt, fas216_internal_done);
2290
2291 /*
2292 * This wastes time, since we can't return until the command is
2293 * complete. We can't sleep either since we may get re-entered!
2294 * However, we must re-enable interrupts, or else we'll be
2295 * waiting forever.
2296 */
2297 spin_unlock_irq(info->host->host_lock);
2298
2299 while (!info->internal_done) {
2300 /*
2301 * If we don't have an IRQ, then we must poll the card for
2302 * it's interrupt, and use that to call this driver's
2303 * interrupt routine. That way, we keep the command
2304 * progressing. Maybe we can add some intelligence here
2305 * and go to sleep if we know that the device is going
2306 * to be some time (eg, disconnected).
2307 */
2308 if (fas216_readb(info, REG_STAT) & STAT_INT) {
2309 spin_lock_irq(info->host->host_lock);
2310 fas216_intr(info);
2311 spin_unlock_irq(info->host->host_lock);
2312 }
2313 }
2314
2315 spin_lock_irq(info->host->host_lock);
2316
2317 scsi_done(SCpnt);
2318
2319 return 0;
2320}
2321
2322DEF_SCSI_QCMD(fas216_noqueue_command)
2323
2324/*
2325 * Error handler timeout function. Indicate that we timed out,
2326 * and wake up any error handler process so it can continue.
2327 */
2328static void fas216_eh_timer(struct timer_list *t)
2329{
2330 FAS216_Info *info = from_timer(info, t, eh_timer);
2331
2332 fas216_log(info, LOG_ERROR, "error handling timed out\n");
2333
2334 del_timer(&info->eh_timer);
2335
2336 if (info->rst_bus_status == 0)
2337 info->rst_bus_status = -1;
2338 if (info->rst_dev_status == 0)
2339 info->rst_dev_status = -1;
2340
2341 wake_up(&info->eh_wait);
2342}
2343
2344enum res_find {
2345 res_failed, /* not found */
2346 res_success, /* command on issue queue */
2347 res_hw_abort /* command on disconnected dev */
2348};
2349
2350/**
2351 * fas216_do_abort - decide how to abort a command
2352 * @SCpnt: command to abort
2353 *
2354 * Decide how to abort a command.
2355 * Returns: abort status
2356 */
2357static enum res_find fas216_find_command(FAS216_Info *info,
2358 struct scsi_cmnd *SCpnt)
2359{
2360 enum res_find res = res_failed;
2361
2362 if (queue_remove_cmd(&info->queues.issue, SCpnt)) {
2363 /*
2364 * The command was on the issue queue, and has not been
2365 * issued yet. We can remove the command from the queue,
2366 * and acknowledge the abort. Neither the device nor the
2367 * interface know about the command.
2368 */
2369 printk("on issue queue ");
2370
2371 res = res_success;
2372 } else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) {
2373 /*
2374 * The command was on the disconnected queue. We must
2375 * reconnect with the device if possible, and send it
2376 * an abort message.
2377 */
2378 printk("on disconnected queue ");
2379
2380 res = res_hw_abort;
2381 } else if (info->SCpnt == SCpnt) {
2382 printk("executing ");
2383
2384 switch (info->scsi.phase) {
2385 /*
2386 * If the interface is idle, and the command is 'disconnectable',
2387 * then it is the same as on the disconnected queue.
2388 */
2389 case PHASE_IDLE:
2390 if (info->scsi.disconnectable) {
2391 info->scsi.disconnectable = 0;
2392 info->SCpnt = NULL;
2393 res = res_hw_abort;
2394 }
2395 break;
2396
2397 default:
2398 break;
2399 }
2400 } else if (info->origSCpnt == SCpnt) {
2401 /*
2402 * The command will be executed next, but a command
2403 * is currently using the interface. This is similar to
2404 * being on the issue queue, except the busylun bit has
2405 * been set.
2406 */
2407 info->origSCpnt = NULL;
2408 clear_bit(SCpnt->device->id * 8 +
2409 (u8)(SCpnt->device->lun & 0x7), info->busyluns);
2410 printk("waiting for execution ");
2411 res = res_success;
2412 } else
2413 printk("unknown ");
2414
2415 return res;
2416}
2417
2418/**
2419 * fas216_eh_abort - abort this command
2420 * @SCpnt: command to abort
2421 *
2422 * Abort this command.
2423 * Returns: FAILED if unable to abort
2424 * Notes: io_request_lock is taken, and irqs are disabled
2425 */
2426int fas216_eh_abort(struct scsi_cmnd *SCpnt)
2427{
2428 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2429 int result = FAILED;
2430
2431 fas216_checkmagic(info);
2432
2433 info->stats.aborts += 1;
2434
2435 scmd_printk(KERN_WARNING, SCpnt, "abort command\n");
2436
2437 print_debug_list();
2438 fas216_dumpstate(info);
2439
2440 switch (fas216_find_command(info, SCpnt)) {
2441 /*
2442 * We found the command, and cleared it out. Either
2443 * the command is still known to be executing on the
2444 * target, or the busylun bit is not set.
2445 */
2446 case res_success:
2447 scmd_printk(KERN_WARNING, SCpnt, "abort %p success\n", SCpnt);
2448 result = SUCCESS;
2449 break;
2450
2451 /*
2452 * We need to reconnect to the target and send it an
2453 * ABORT or ABORT_TAG message. We can only do this
2454 * if the bus is free.
2455 */
2456 case res_hw_abort:
2457
2458 /*
2459 * We are unable to abort the command for some reason.
2460 */
2461 default:
2462 case res_failed:
2463 scmd_printk(KERN_WARNING, SCpnt, "abort %p failed\n", SCpnt);
2464 break;
2465 }
2466
2467 return result;
2468}
2469
2470/**
2471 * fas216_eh_device_reset - Reset the device associated with this command
2472 * @SCpnt: command specifing device to reset
2473 *
2474 * Reset the device associated with this command.
2475 * Returns: FAILED if unable to reset.
2476 * Notes: We won't be re-entered, so we'll only have one device
2477 * reset on the go at one time.
2478 */
2479int fas216_eh_device_reset(struct scsi_cmnd *SCpnt)
2480{
2481 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2482 unsigned long flags;
2483 int i, res = FAILED, target = SCpnt->device->id;
2484
2485 fas216_log(info, LOG_ERROR, "device reset for target %d", target);
2486
2487 spin_lock_irqsave(&info->host_lock, flags);
2488
2489 do {
2490 /*
2491 * If we are currently connected to a device, and
2492 * it is the device we want to reset, there is
2493 * nothing we can do here. Chances are it is stuck,
2494 * and we need a bus reset.
2495 */
2496 if (info->SCpnt && !info->scsi.disconnectable &&
2497 info->SCpnt->device->id == SCpnt->device->id)
2498 break;
2499
2500 /*
2501 * We're going to be resetting this device. Remove
2502 * all pending commands from the driver. By doing
2503 * so, we guarantee that we won't touch the command
2504 * structures except to process the reset request.
2505 */
2506 queue_remove_all_target(&info->queues.issue, target);
2507 queue_remove_all_target(&info->queues.disconnected, target);
2508 if (info->origSCpnt && info->origSCpnt->device->id == target)
2509 info->origSCpnt = NULL;
2510 if (info->reqSCpnt && info->reqSCpnt->device->id == target)
2511 info->reqSCpnt = NULL;
2512 for (i = 0; i < 8; i++)
2513 clear_bit(target * 8 + i, info->busyluns);
2514
2515 /*
2516 * Hijack this SCSI command structure to send
2517 * a bus device reset message to this device.
2518 */
2519 SCpnt->host_scribble = (void *)fas216_devicereset_done;
2520
2521 info->rst_dev_status = 0;
2522 info->rstSCpnt = SCpnt;
2523
2524 if (info->scsi.phase == PHASE_IDLE)
2525 fas216_kick(info);
2526
2527 mod_timer(&info->eh_timer, jiffies + 30 * HZ);
2528 spin_unlock_irqrestore(&info->host_lock, flags);
2529
2530 /*
2531 * Wait up to 30 seconds for the reset to complete.
2532 */
2533 wait_event(info->eh_wait, info->rst_dev_status);
2534
2535 del_timer_sync(&info->eh_timer);
2536 spin_lock_irqsave(&info->host_lock, flags);
2537 info->rstSCpnt = NULL;
2538
2539 if (info->rst_dev_status == 1)
2540 res = SUCCESS;
2541 } while (0);
2542
2543 SCpnt->host_scribble = NULL;
2544 spin_unlock_irqrestore(&info->host_lock, flags);
2545
2546 fas216_log(info, LOG_ERROR, "device reset complete: %s\n",
2547 res == SUCCESS ? "success" : "failed");
2548
2549 return res;
2550}
2551
2552/**
2553 * fas216_eh_bus_reset - Reset the bus associated with the command
2554 * @SCpnt: command specifing bus to reset
2555 *
2556 * Reset the bus associated with the command.
2557 * Returns: FAILED if unable to reset.
2558 * Notes: Further commands are blocked.
2559 */
2560int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt)
2561{
2562 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2563 unsigned long flags;
2564 struct scsi_device *SDpnt;
2565
2566 fas216_checkmagic(info);
2567 fas216_log(info, LOG_ERROR, "resetting bus");
2568
2569 info->stats.bus_resets += 1;
2570
2571 spin_lock_irqsave(&info->host_lock, flags);
2572
2573 /*
2574 * Stop all activity on this interface.
2575 */
2576 fas216_aborttransfer(info);
2577 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2578
2579 /*
2580 * Clear any pending interrupts.
2581 */
2582 while (fas216_readb(info, REG_STAT) & STAT_INT)
2583 fas216_readb(info, REG_INST);
2584
2585 info->rst_bus_status = 0;
2586
2587 /*
2588 * For each attached hard-reset device, clear out
2589 * all command structures. Leave the running
2590 * command in place.
2591 */
2592 shost_for_each_device(SDpnt, info->host) {
2593 int i;
2594
2595 if (SDpnt->soft_reset)
2596 continue;
2597
2598 queue_remove_all_target(&info->queues.issue, SDpnt->id);
2599 queue_remove_all_target(&info->queues.disconnected, SDpnt->id);
2600 if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id)
2601 info->origSCpnt = NULL;
2602 if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id)
2603 info->reqSCpnt = NULL;
2604 info->SCpnt = NULL;
2605
2606 for (i = 0; i < 8; i++)
2607 clear_bit(SDpnt->id * 8 + i, info->busyluns);
2608 }
2609
2610 info->scsi.phase = PHASE_IDLE;
2611
2612 /*
2613 * Reset the SCSI bus. Device cleanup happens in
2614 * the interrupt handler.
2615 */
2616 fas216_cmd(info, CMD_RESETSCSI);
2617
2618 mod_timer(&info->eh_timer, jiffies + HZ);
2619 spin_unlock_irqrestore(&info->host_lock, flags);
2620
2621 /*
2622 * Wait one second for the interrupt.
2623 */
2624 wait_event(info->eh_wait, info->rst_bus_status);
2625 del_timer_sync(&info->eh_timer);
2626
2627 fas216_log(info, LOG_ERROR, "bus reset complete: %s\n",
2628 info->rst_bus_status == 1 ? "success" : "failed");
2629
2630 return info->rst_bus_status == 1 ? SUCCESS : FAILED;
2631}
2632
2633/**
2634 * fas216_init_chip - Initialise FAS216 state after reset
2635 * @info: state structure for interface
2636 *
2637 * Initialise FAS216 state after reset
2638 */
2639static void fas216_init_chip(FAS216_Info *info)
2640{
2641 unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7;
2642 fas216_writeb(info, REG_CLKF, clock);
2643 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2644 fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]);
2645 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2646 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
2647 fas216_writeb(info, REG_SOF, 0);
2648 fas216_writeb(info, REG_STP, info->scsi.async_stp);
2649 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2650}
2651
2652/**
2653 * fas216_eh_host_reset - Reset the host associated with this command
2654 * @SCpnt: command specifing host to reset
2655 *
2656 * Reset the host associated with this command.
2657 * Returns: FAILED if unable to reset.
2658 * Notes: io_request_lock is taken, and irqs are disabled
2659 */
2660int fas216_eh_host_reset(struct scsi_cmnd *SCpnt)
2661{
2662 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2663
2664 spin_lock_irq(info->host->host_lock);
2665
2666 fas216_checkmagic(info);
2667
2668 fas216_log(info, LOG_ERROR, "resetting host");
2669
2670 /*
2671 * Reset the SCSI chip.
2672 */
2673 fas216_cmd(info, CMD_RESETCHIP);
2674
2675 /*
2676 * Ugly ugly ugly!
2677 * We need to release the host_lock and enable
2678 * IRQs if we sleep, but we must relock and disable
2679 * IRQs after the sleep.
2680 */
2681 spin_unlock_irq(info->host->host_lock);
2682 msleep(50 * 1000/100);
2683 spin_lock_irq(info->host->host_lock);
2684
2685 /*
2686 * Release the SCSI reset.
2687 */
2688 fas216_cmd(info, CMD_NOP);
2689
2690 fas216_init_chip(info);
2691
2692 spin_unlock_irq(info->host->host_lock);
2693 return SUCCESS;
2694}
2695
2696#define TYPE_UNKNOWN 0
2697#define TYPE_NCR53C90 1
2698#define TYPE_NCR53C90A 2
2699#define TYPE_NCR53C9x 3
2700#define TYPE_Am53CF94 4
2701#define TYPE_EmFAS216 5
2702#define TYPE_QLFAS216 6
2703
2704static char *chip_types[] = {
2705 "unknown",
2706 "NS NCR53C90",
2707 "NS NCR53C90A",
2708 "NS NCR53C9x",
2709 "AMD Am53CF94",
2710 "Emulex FAS216",
2711 "QLogic FAS216"
2712};
2713
2714static int fas216_detect_type(FAS216_Info *info)
2715{
2716 int family, rev;
2717
2718 /*
2719 * Reset the chip.
2720 */
2721 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2722 udelay(50);
2723 fas216_writeb(info, REG_CMD, CMD_NOP);
2724
2725 /*
2726 * Check to see if control reg 2 is present.
2727 */
2728 fas216_writeb(info, REG_CNTL3, 0);
2729 fas216_writeb(info, REG_CNTL2, CNTL2_S2FE);
2730
2731 /*
2732 * If we are unable to read back control reg 2
2733 * correctly, it is not present, and we have a
2734 * NCR53C90.
2735 */
2736 if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE)
2737 return TYPE_NCR53C90;
2738
2739 /*
2740 * Now, check control register 3
2741 */
2742 fas216_writeb(info, REG_CNTL2, 0);
2743 fas216_writeb(info, REG_CNTL3, 0);
2744 fas216_writeb(info, REG_CNTL3, 5);
2745
2746 /*
2747 * If we are unable to read the register back
2748 * correctly, we have a NCR53C90A
2749 */
2750 if (fas216_readb(info, REG_CNTL3) != 5)
2751 return TYPE_NCR53C90A;
2752
2753 /*
2754 * Now read the ID from the chip.
2755 */
2756 fas216_writeb(info, REG_CNTL3, 0);
2757
2758 fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK);
2759 fas216_writeb(info, REG_CNTL3, 0);
2760
2761 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2762 udelay(50);
2763 fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP);
2764
2765 fas216_writeb(info, REG_CNTL2, CNTL2_ENF);
2766 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2767 udelay(50);
2768 fas216_writeb(info, REG_CMD, CMD_NOP);
2769
2770 rev = fas216_readb(info, REG_ID);
2771 family = rev >> 3;
2772 rev &= 7;
2773
2774 switch (family) {
2775 case 0x01:
2776 if (rev == 4)
2777 return TYPE_Am53CF94;
2778 break;
2779
2780 case 0x02:
2781 switch (rev) {
2782 case 2:
2783 return TYPE_EmFAS216;
2784 case 3:
2785 return TYPE_QLFAS216;
2786 }
2787 break;
2788
2789 default:
2790 break;
2791 }
2792 printk("family %x rev %x\n", family, rev);
2793 return TYPE_NCR53C9x;
2794}
2795
2796/**
2797 * fas216_reset_state - Initialise driver internal state
2798 * @info: state to initialise
2799 *
2800 * Initialise driver internal state
2801 */
2802static void fas216_reset_state(FAS216_Info *info)
2803{
2804 int i;
2805
2806 fas216_checkmagic(info);
2807
2808 fas216_bus_reset(info);
2809
2810 /*
2811 * Clear out all stale info in our state structure
2812 */
2813 memset(info->busyluns, 0, sizeof(info->busyluns));
2814 info->scsi.disconnectable = 0;
2815 info->scsi.aborting = 0;
2816
2817 for (i = 0; i < 8; i++) {
2818 info->device[i].parity_enabled = 0;
2819 info->device[i].parity_check = 1;
2820 }
2821
2822 /*
2823 * Drain all commands on disconnected queue
2824 */
2825 while (queue_remove(&info->queues.disconnected) != NULL);
2826
2827 /*
2828 * Remove executing commands.
2829 */
2830 info->SCpnt = NULL;
2831 info->reqSCpnt = NULL;
2832 info->rstSCpnt = NULL;
2833 info->origSCpnt = NULL;
2834}
2835
2836/**
2837 * fas216_init - initialise FAS/NCR/AMD SCSI structures.
2838 * @host: a driver-specific filled-out structure
2839 *
2840 * Initialise FAS/NCR/AMD SCSI structures.
2841 * Returns: 0 on success
2842 */
2843int fas216_init(struct Scsi_Host *host)
2844{
2845 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2846
2847 info->magic_start = MAGIC;
2848 info->magic_end = MAGIC;
2849 info->host = host;
2850 info->scsi.cfg[0] = host->this_id | CNTL1_PERE;
2851 info->scsi.cfg[1] = CNTL2_ENF | CNTL2_S2FE;
2852 info->scsi.cfg[2] = info->ifcfg.cntl3 |
2853 CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM;
2854 info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod);
2855
2856 info->rst_dev_status = -1;
2857 info->rst_bus_status = -1;
2858 init_waitqueue_head(&info->eh_wait);
2859 timer_setup(&info->eh_timer, fas216_eh_timer, 0);
2860
2861 spin_lock_init(&info->host_lock);
2862
2863 memset(&info->stats, 0, sizeof(info->stats));
2864
2865 msgqueue_initialise(&info->scsi.msgs);
2866
2867 if (!queue_initialise(&info->queues.issue))
2868 return -ENOMEM;
2869
2870 if (!queue_initialise(&info->queues.disconnected)) {
2871 queue_free(&info->queues.issue);
2872 return -ENOMEM;
2873 }
2874
2875 return 0;
2876}
2877
2878/**
2879 * fas216_add - initialise FAS/NCR/AMD SCSI ic.
2880 * @host: a driver-specific filled-out structure
2881 * @dev: parent device
2882 *
2883 * Initialise FAS/NCR/AMD SCSI ic.
2884 * Returns: 0 on success
2885 */
2886int fas216_add(struct Scsi_Host *host, struct device *dev)
2887{
2888 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2889 int type, ret;
2890
2891 if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) {
2892 printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n",
2893 info->ifcfg.clockrate);
2894 return -EINVAL;
2895 }
2896
2897 fas216_reset_state(info);
2898 type = fas216_detect_type(info);
2899 info->scsi.type = chip_types[type];
2900
2901 udelay(300);
2902
2903 /*
2904 * Initialise the chip correctly.
2905 */
2906 fas216_init_chip(info);
2907
2908 /*
2909 * Reset the SCSI bus. We don't want to see
2910 * the resulting reset interrupt, so mask it
2911 * out.
2912 */
2913 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR);
2914 fas216_writeb(info, REG_CMD, CMD_RESETSCSI);
2915
2916 /*
2917 * scsi standard says wait 250ms
2918 */
2919 spin_unlock_irq(info->host->host_lock);
2920 msleep(100*1000/100);
2921 spin_lock_irq(info->host->host_lock);
2922
2923 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2924 fas216_readb(info, REG_INST);
2925
2926 fas216_checkmagic(info);
2927
2928 ret = scsi_add_host(host, dev);
2929 if (ret)
2930 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2931 else
2932 scsi_scan_host(host);
2933
2934 return ret;
2935}
2936
2937void fas216_remove(struct Scsi_Host *host)
2938{
2939 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2940
2941 fas216_checkmagic(info);
2942 scsi_remove_host(host);
2943
2944 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2945 scsi_host_put(host);
2946}
2947
2948/**
2949 * fas216_release - release all resources for FAS/NCR/AMD SCSI ic.
2950 * @host: a driver-specific filled-out structure
2951 *
2952 * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic.
2953 */
2954void fas216_release(struct Scsi_Host *host)
2955{
2956 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2957
2958 queue_free(&info->queues.disconnected);
2959 queue_free(&info->queues.issue);
2960}
2961
2962void fas216_print_host(FAS216_Info *info, struct seq_file *m)
2963{
2964 seq_printf(m,
2965 "\n"
2966 "Chip : %s\n"
2967 " Address: 0x%p\n"
2968 " IRQ : %d\n"
2969 " DMA : %d\n",
2970 info->scsi.type, info->scsi.io_base,
2971 info->scsi.irq, info->scsi.dma);
2972}
2973
2974void fas216_print_stats(FAS216_Info *info, struct seq_file *m)
2975{
2976 seq_printf(m, "\n"
2977 "Command Statistics:\n"
2978 " Queued : %u\n"
2979 " Issued : %u\n"
2980 " Completed : %u\n"
2981 " Reads : %u\n"
2982 " Writes : %u\n"
2983 " Others : %u\n"
2984 " Disconnects: %u\n"
2985 " Aborts : %u\n"
2986 " Bus resets : %u\n"
2987 " Host resets: %u\n",
2988 info->stats.queues, info->stats.removes,
2989 info->stats.fins, info->stats.reads,
2990 info->stats.writes, info->stats.miscs,
2991 info->stats.disconnects, info->stats.aborts,
2992 info->stats.bus_resets, info->stats.host_resets);
2993}
2994
2995void fas216_print_devices(FAS216_Info *info, struct seq_file *m)
2996{
2997 struct fas216_device *dev;
2998 struct scsi_device *scd;
2999
3000 seq_puts(m, "Device/Lun TaggedQ Parity Sync\n");
3001
3002 shost_for_each_device(scd, info->host) {
3003 dev = &info->device[scd->id];
3004 seq_printf(m, " %d/%llu ", scd->id, scd->lun);
3005 if (scd->tagged_supported)
3006 seq_printf(m, "%3sabled ",
3007 scd->simple_tags ? "en" : "dis");
3008 else
3009 seq_puts(m, "unsupported ");
3010
3011 seq_printf(m, "%3sabled ", dev->parity_enabled ? "en" : "dis");
3012
3013 if (dev->sof)
3014 seq_printf(m, "offset %d, %d ns\n",
3015 dev->sof, dev->period * 4);
3016 else
3017 seq_puts(m, "async\n");
3018 }
3019}
3020
3021EXPORT_SYMBOL(fas216_init);
3022EXPORT_SYMBOL(fas216_add);
3023EXPORT_SYMBOL(fas216_queue_command);
3024EXPORT_SYMBOL(fas216_noqueue_command);
3025EXPORT_SYMBOL(fas216_intr);
3026EXPORT_SYMBOL(fas216_remove);
3027EXPORT_SYMBOL(fas216_release);
3028EXPORT_SYMBOL(fas216_eh_abort);
3029EXPORT_SYMBOL(fas216_eh_device_reset);
3030EXPORT_SYMBOL(fas216_eh_bus_reset);
3031EXPORT_SYMBOL(fas216_eh_host_reset);
3032EXPORT_SYMBOL(fas216_print_host);
3033EXPORT_SYMBOL(fas216_print_stats);
3034EXPORT_SYMBOL(fas216_print_devices);
3035
3036MODULE_AUTHOR("Russell King");
3037MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core");
3038MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/drivers/acorn/scsi/fas216.c
4 *
5 * Copyright (C) 1997-2003 Russell King
6 *
7 * Based on information in qlogicfas.c by Tom Zerucha, Michael Griffith, and
8 * other sources, including:
9 * the AMD Am53CF94 data sheet
10 * the AMD Am53C94 data sheet
11 *
12 * This is a generic driver. To use it, have a look at cumana_2.c. You
13 * should define your own structure that overlays FAS216_Info, eg:
14 * struct my_host_data {
15 * FAS216_Info info;
16 * ... my host specific data ...
17 * };
18 *
19 * Changelog:
20 * 30-08-1997 RMK Created
21 * 14-09-1997 RMK Started disconnect support
22 * 08-02-1998 RMK Corrected real DMA support
23 * 15-02-1998 RMK Started sync xfer support
24 * 06-04-1998 RMK Tightened conditions for printing incomplete
25 * transfers
26 * 02-05-1998 RMK Added extra checks in fas216_reset
27 * 24-05-1998 RMK Fixed synchronous transfers with period >= 200ns
28 * 27-06-1998 RMK Changed asm/delay.h to linux/delay.h
29 * 26-08-1998 RMK Improved message support wrt MESSAGE_REJECT
30 * 02-04-2000 RMK Converted to use the new error handling, and
31 * automatically request sense data upon check
32 * condition status from targets.
33 */
34#include <linux/module.h>
35#include <linux/blkdev.h>
36#include <linux/kernel.h>
37#include <linux/string.h>
38#include <linux/ioport.h>
39#include <linux/proc_fs.h>
40#include <linux/delay.h>
41#include <linux/bitops.h>
42#include <linux/init.h>
43#include <linux/interrupt.h>
44
45#include <asm/dma.h>
46#include <asm/io.h>
47#include <asm/irq.h>
48#include <asm/ecard.h>
49
50#include <scsi/scsi.h>
51#include <scsi/scsi_cmnd.h>
52#include <scsi/scsi_dbg.h>
53#include <scsi/scsi_device.h>
54#include <scsi/scsi_eh.h>
55#include <scsi/scsi_host.h>
56#include <scsi/scsi_tcq.h>
57#include "fas216.h"
58#include "arm_scsi.h"
59
60/* NOTE: SCSI2 Synchronous transfers *require* DMA according to
61 * the data sheet. This restriction is crazy, especially when
62 * you only want to send 16 bytes! What were the guys who
63 * designed this chip on at that time? Did they read the SCSI2
64 * spec at all? The following sections are taken from the SCSI2
65 * standard (s2r10) concerning this:
66 *
67 * > IMPLEMENTORS NOTES:
68 * > (1) Re-negotiation at every selection is not recommended, since a
69 * > significant performance impact is likely.
70 *
71 * > The implied synchronous agreement shall remain in effect until a BUS DEVICE
72 * > RESET message is received, until a hard reset condition occurs, or until one
73 * > of the two SCSI devices elects to modify the agreement. The default data
74 * > transfer mode is asynchronous data transfer mode. The default data transfer
75 * > mode is entered at power on, after a BUS DEVICE RESET message, or after a hard
76 * > reset condition.
77 *
78 * In total, this means that once you have elected to use synchronous
79 * transfers, you must always use DMA.
80 *
81 * I was thinking that this was a good chip until I found this restriction ;(
82 */
83#define SCSI2_SYNC
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
101#ifndef MODULE
102static int __init fas216_log_setup(char *str)
103{
104 char *s;
105
106 level_mask = 0;
107
108 while ((s = strsep(&str, ",")) != NULL) {
109 switch (s[0]) {
110 case 'a':
111 if (strcmp(s, "all") == 0)
112 level_mask |= -1;
113 break;
114 case 'b':
115 if (strncmp(s, "bus", 3) == 0)
116 level_mask |= LOG_BUSSERVICE;
117 if (strncmp(s, "buf", 3) == 0)
118 level_mask |= LOG_BUFFER;
119 break;
120 case 'c':
121 level_mask |= LOG_CONNECT;
122 break;
123 case 'e':
124 level_mask |= LOG_ERROR;
125 break;
126 case 'm':
127 level_mask |= LOG_MESSAGES;
128 break;
129 case 'n':
130 if (strcmp(s, "none") == 0)
131 level_mask = 0;
132 break;
133 case 's':
134 level_mask |= LOG_FUNCTIONDONE;
135 break;
136 }
137 }
138 return 1;
139}
140
141__setup("fas216_logging=", fas216_log_setup);
142#endif
143
144static inline unsigned char fas216_readb(FAS216_Info *info, unsigned int reg)
145{
146 unsigned int off = reg << info->scsi.io_shift;
147 return readb(info->scsi.io_base + off);
148}
149
150static inline void fas216_writeb(FAS216_Info *info, unsigned int reg, unsigned int val)
151{
152 unsigned int off = reg << info->scsi.io_shift;
153 writeb(val, info->scsi.io_base + off);
154}
155
156static void fas216_dumpstate(FAS216_Info *info)
157{
158 unsigned char is, stat, inst;
159
160 is = fas216_readb(info, REG_IS);
161 stat = fas216_readb(info, REG_STAT);
162 inst = fas216_readb(info, REG_INST);
163
164 printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X"
165 " INST=%02X IS=%02X CFIS=%02X",
166 fas216_readb(info, REG_CTCL),
167 fas216_readb(info, REG_CTCM),
168 fas216_readb(info, REG_CMD), stat, inst, is,
169 fas216_readb(info, REG_CFIS));
170 printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n",
171 fas216_readb(info, REG_CNTL1),
172 fas216_readb(info, REG_CNTL2),
173 fas216_readb(info, REG_CNTL3),
174 fas216_readb(info, REG_CTCH));
175}
176
177static void print_SCp(struct scsi_pointer *SCp, const char *prefix, const char *suffix)
178{
179 printk("%sptr %p this_residual 0x%x buffer %p buffers_residual 0x%x%s",
180 prefix, SCp->ptr, SCp->this_residual, SCp->buffer,
181 SCp->buffers_residual, suffix);
182}
183
184#ifdef CHECK_STRUCTURE
185static void fas216_dumpinfo(FAS216_Info *info)
186{
187 static int used = 0;
188 int i;
189
190 if (used++)
191 return;
192
193 printk("FAS216_Info=\n");
194 printk(" { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p\n",
195 info->magic_start, info->host, info->SCpnt,
196 info->origSCpnt);
197 printk(" scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }\n",
198 info->scsi.io_shift, info->scsi.irq,
199 info->scsi.cfg[0], info->scsi.cfg[1], info->scsi.cfg[2],
200 info->scsi.cfg[3]);
201 printk(" type=%p phase=%X\n",
202 info->scsi.type, info->scsi.phase);
203 print_SCp(&info->scsi.SCp, " SCp={ ", " }\n");
204 printk(" msgs async_stp=%X disconnectable=%d aborting=%d }\n",
205 info->scsi.async_stp,
206 info->scsi.disconnectable, info->scsi.aborting);
207 printk(" stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X\n"
208 " disconnects=%X aborts=%X bus_resets=%X host_resets=%X}\n",
209 info->stats.queues, info->stats.removes, info->stats.fins,
210 info->stats.reads, info->stats.writes, info->stats.miscs,
211 info->stats.disconnects, info->stats.aborts, info->stats.bus_resets,
212 info->stats.host_resets);
213 printk(" ifcfg={ clockrate=%X select_timeout=%X asyncperiod=%X sync_max_depth=%X }\n",
214 info->ifcfg.clockrate, info->ifcfg.select_timeout,
215 info->ifcfg.asyncperiod, info->ifcfg.sync_max_depth);
216 for (i = 0; i < 8; i++) {
217 printk(" busyluns[%d]=%08lx dev[%d]={ disconnect_ok=%d stp=%X sof=%X sync_state=%X }\n",
218 i, info->busyluns[i], i,
219 info->device[i].disconnect_ok, info->device[i].stp,
220 info->device[i].sof, info->device[i].sync_state);
221 }
222 printk(" dma={ transfer_type=%X setup=%p pseudo=%p stop=%p }\n",
223 info->dma.transfer_type, info->dma.setup,
224 info->dma.pseudo, info->dma.stop);
225 printk(" internal_done=%X magic_end=%lX }\n",
226 info->internal_done, info->magic_end);
227}
228
229static void __fas216_checkmagic(FAS216_Info *info, const char *func)
230{
231 int corruption = 0;
232 if (info->magic_start != MAGIC) {
233 printk(KERN_CRIT "FAS216 Error: magic at start corrupted\n");
234 corruption++;
235 }
236 if (info->magic_end != MAGIC) {
237 printk(KERN_CRIT "FAS216 Error: magic at end corrupted\n");
238 corruption++;
239 }
240 if (corruption) {
241 fas216_dumpinfo(info);
242 panic("scsi memory space corrupted in %s", func);
243 }
244}
245#define fas216_checkmagic(info) __fas216_checkmagic((info), __func__)
246#else
247#define fas216_checkmagic(info)
248#endif
249
250static const char *fas216_bus_phase(int stat)
251{
252 static const char *phases[] = {
253 "DATA OUT", "DATA IN",
254 "COMMAND", "STATUS",
255 "MISC OUT", "MISC IN",
256 "MESG OUT", "MESG IN"
257 };
258
259 return phases[stat & STAT_BUSMASK];
260}
261
262static const char *fas216_drv_phase(FAS216_Info *info)
263{
264 static const char *phases[] = {
265 [PHASE_IDLE] = "idle",
266 [PHASE_SELECTION] = "selection",
267 [PHASE_COMMAND] = "command",
268 [PHASE_DATAOUT] = "data out",
269 [PHASE_DATAIN] = "data in",
270 [PHASE_MSGIN] = "message in",
271 [PHASE_MSGIN_DISCONNECT]= "disconnect",
272 [PHASE_MSGOUT_EXPECT] = "expect message out",
273 [PHASE_MSGOUT] = "message out",
274 [PHASE_STATUS] = "status",
275 [PHASE_DONE] = "done",
276 };
277
278 if (info->scsi.phase < ARRAY_SIZE(phases) &&
279 phases[info->scsi.phase])
280 return phases[info->scsi.phase];
281 return "???";
282}
283
284static char fas216_target(FAS216_Info *info)
285{
286 if (info->SCpnt)
287 return '0' + info->SCpnt->device->id;
288 else
289 return 'H';
290}
291
292static void
293fas216_do_log(FAS216_Info *info, char target, char *fmt, va_list ap)
294{
295 static char buf[1024];
296
297 vsnprintf(buf, sizeof(buf), fmt, ap);
298 printk("scsi%d.%c: %s", info->host->host_no, target, buf);
299}
300
301static void fas216_log_command(FAS216_Info *info, int level,
302 struct scsi_cmnd *SCpnt, char *fmt, ...)
303{
304 va_list args;
305
306 if (level != 0 && !(level & level_mask))
307 return;
308
309 va_start(args, fmt);
310 fas216_do_log(info, '0' + SCpnt->device->id, fmt, args);
311 va_end(args);
312
313 scsi_print_command(SCpnt);
314}
315
316static void
317fas216_log_target(FAS216_Info *info, int level, int target, char *fmt, ...)
318{
319 va_list args;
320
321 if (level != 0 && !(level & level_mask))
322 return;
323
324 if (target < 0)
325 target = 'H';
326 else
327 target += '0';
328
329 va_start(args, fmt);
330 fas216_do_log(info, target, fmt, args);
331 va_end(args);
332
333 printk("\n");
334}
335
336static void fas216_log(FAS216_Info *info, int level, char *fmt, ...)
337{
338 va_list args;
339
340 if (level != 0 && !(level & level_mask))
341 return;
342
343 va_start(args, fmt);
344 fas216_do_log(info, fas216_target(info), fmt, args);
345 va_end(args);
346
347 printk("\n");
348}
349
350#define PH_SIZE 32
351
352static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE];
353static int ph_ptr;
354
355static void add_debug_list(int stat, int ssr, int isr, int ph)
356{
357 ph_list[ph_ptr].stat = stat;
358 ph_list[ph_ptr].ssr = ssr;
359 ph_list[ph_ptr].isr = isr;
360 ph_list[ph_ptr].ph = ph;
361
362 ph_ptr = (ph_ptr + 1) & (PH_SIZE-1);
363}
364
365static struct { int command; void *from; } cmd_list[8];
366static int cmd_ptr;
367
368static void fas216_cmd(FAS216_Info *info, unsigned int command)
369{
370 cmd_list[cmd_ptr].command = command;
371 cmd_list[cmd_ptr].from = __builtin_return_address(0);
372
373 cmd_ptr = (cmd_ptr + 1) & 7;
374
375 fas216_writeb(info, REG_CMD, command);
376}
377
378static void print_debug_list(void)
379{
380 int i;
381
382 i = ph_ptr;
383
384 printk(KERN_ERR "SCSI IRQ trail\n");
385 do {
386 printk(" %02x:%02x:%02x:%1x",
387 ph_list[i].stat, ph_list[i].ssr,
388 ph_list[i].isr, ph_list[i].ph);
389 i = (i + 1) & (PH_SIZE - 1);
390 if (((i ^ ph_ptr) & 7) == 0)
391 printk("\n");
392 } while (i != ph_ptr);
393 if ((i ^ ph_ptr) & 7)
394 printk("\n");
395
396 i = cmd_ptr;
397 printk(KERN_ERR "FAS216 commands: ");
398 do {
399 printk("%02x:%p ", cmd_list[i].command, cmd_list[i].from);
400 i = (i + 1) & 7;
401 } while (i != cmd_ptr);
402 printk("\n");
403}
404
405static void fas216_done(FAS216_Info *info, unsigned int result);
406
407/**
408 * fas216_get_last_msg - retrive last message from the list
409 * @info: interface to search
410 * @pos: current fifo position
411 *
412 * Retrieve a last message from the list, using position in fifo.
413 */
414static inline unsigned short
415fas216_get_last_msg(FAS216_Info *info, int pos)
416{
417 unsigned short packed_msg = NOP;
418 struct message *msg;
419 int msgnr = 0;
420
421 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
422 if (pos >= msg->fifo)
423 break;
424 }
425
426 if (msg) {
427 if (msg->msg[0] == EXTENDED_MESSAGE)
428 packed_msg = EXTENDED_MESSAGE | msg->msg[2] << 8;
429 else
430 packed_msg = msg->msg[0];
431 }
432
433 fas216_log(info, LOG_MESSAGES,
434 "Message: %04x found at position %02x\n", packed_msg, pos);
435
436 return packed_msg;
437}
438
439/**
440 * fas216_syncperiod - calculate STP register value
441 * @info: state structure for interface connected to device
442 * @ns: period in ns (between subsequent bytes)
443 *
444 * Calculate value to be loaded into the STP register for a given period
445 * in ns. Returns a value suitable for REG_STP.
446 */
447static int fas216_syncperiod(FAS216_Info *info, int ns)
448{
449 int value = (info->ifcfg.clockrate * ns) / 1000;
450
451 fas216_checkmagic(info);
452
453 if (value < 4)
454 value = 4;
455 else if (value > 35)
456 value = 35;
457
458 return value & 31;
459}
460
461/**
462 * fas216_set_sync - setup FAS216 chip for specified transfer period.
463 * @info: state structure for interface connected to device
464 * @target: target
465 *
466 * Correctly setup FAS216 chip for specified transfer period.
467 * Notes : we need to switch the chip out of FASTSCSI mode if we have
468 * a transfer period >= 200ns - otherwise the chip will violate
469 * the SCSI timings.
470 */
471static void fas216_set_sync(FAS216_Info *info, int target)
472{
473 unsigned int cntl3;
474
475 fas216_writeb(info, REG_SOF, info->device[target].sof);
476 fas216_writeb(info, REG_STP, info->device[target].stp);
477
478 cntl3 = info->scsi.cfg[2];
479 if (info->device[target].period >= (200 / 4))
480 cntl3 = cntl3 & ~CNTL3_FASTSCSI;
481
482 fas216_writeb(info, REG_CNTL3, cntl3);
483}
484
485/* Synchronous transfer support
486 *
487 * Note: The SCSI II r10 spec says (5.6.12):
488 *
489 * (2) Due to historical problems with early host adapters that could
490 * not accept an SDTR message, some targets may not initiate synchronous
491 * negotiation after a power cycle as required by this standard. Host
492 * adapters that support synchronous mode may avoid the ensuing failure
493 * modes when the target is independently power cycled by initiating a
494 * synchronous negotiation on each REQUEST SENSE and INQUIRY command.
495 * This approach increases the SCSI bus overhead and is not recommended
496 * for new implementations. The correct method is to respond to an
497 * SDTR message with a MESSAGE REJECT message if the either the
498 * initiator or target devices does not support synchronous transfers
499 * or does not want to negotiate for synchronous transfers at the time.
500 * Using the correct method assures compatibility with wide data
501 * transfers and future enhancements.
502 *
503 * We will always initiate a synchronous transfer negotiation request on
504 * every INQUIRY or REQUEST SENSE message, unless the target itself has
505 * at some point performed a synchronous transfer negotiation request, or
506 * we have synchronous transfers disabled for this device.
507 */
508
509/**
510 * fas216_handlesync - Handle a synchronous transfer message
511 * @info: state structure for interface
512 * @msg: message from target
513 *
514 * Handle a synchronous transfer message from the target
515 */
516static void fas216_handlesync(FAS216_Info *info, char *msg)
517{
518 struct fas216_device *dev = &info->device[info->SCpnt->device->id];
519 enum { sync, async, none, reject } res = none;
520
521#ifdef SCSI2_SYNC
522 switch (msg[0]) {
523 case MESSAGE_REJECT:
524 /* Synchronous transfer request failed.
525 * Note: SCSI II r10:
526 *
527 * SCSI devices that are capable of synchronous
528 * data transfers shall not respond to an SDTR
529 * message with a MESSAGE REJECT message.
530 *
531 * Hence, if we get this condition, we disable
532 * negotiation for this device.
533 */
534 if (dev->sync_state == neg_inprogress) {
535 dev->sync_state = neg_invalid;
536 res = async;
537 }
538 break;
539
540 case EXTENDED_MESSAGE:
541 switch (dev->sync_state) {
542 /* We don't accept synchronous transfer requests.
543 * Respond with a MESSAGE_REJECT to prevent a
544 * synchronous transfer agreement from being reached.
545 */
546 case neg_invalid:
547 res = reject;
548 break;
549
550 /* We were not negotiating a synchronous transfer,
551 * but the device sent us a negotiation request.
552 * Honour the request by sending back a SDTR
553 * message containing our capability, limited by
554 * the targets capability.
555 */
556 default:
557 fas216_cmd(info, CMD_SETATN);
558 if (msg[4] > info->ifcfg.sync_max_depth)
559 msg[4] = info->ifcfg.sync_max_depth;
560 if (msg[3] < 1000 / info->ifcfg.clockrate)
561 msg[3] = 1000 / info->ifcfg.clockrate;
562
563 msgqueue_flush(&info->scsi.msgs);
564 msgqueue_addmsg(&info->scsi.msgs, 5,
565 EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
566 msg[3], msg[4]);
567 info->scsi.phase = PHASE_MSGOUT_EXPECT;
568
569 /* This is wrong. The agreement is not in effect
570 * until this message is accepted by the device
571 */
572 dev->sync_state = neg_targcomplete;
573 res = sync;
574 break;
575
576 /* We initiated the synchronous transfer negotiation,
577 * and have successfully received a response from the
578 * target. The synchronous transfer agreement has been
579 * reached. Note: if the values returned are out of our
580 * bounds, we must reject the message.
581 */
582 case neg_inprogress:
583 res = reject;
584 if (msg[4] <= info->ifcfg.sync_max_depth &&
585 msg[3] >= 1000 / info->ifcfg.clockrate) {
586 dev->sync_state = neg_complete;
587 res = sync;
588 }
589 break;
590 }
591 }
592#else
593 res = reject;
594#endif
595
596 switch (res) {
597 case sync:
598 dev->period = msg[3];
599 dev->sof = msg[4];
600 dev->stp = fas216_syncperiod(info, msg[3] * 4);
601 fas216_set_sync(info, info->SCpnt->device->id);
602 break;
603
604 case reject:
605 fas216_cmd(info, CMD_SETATN);
606 msgqueue_flush(&info->scsi.msgs);
607 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
608 info->scsi.phase = PHASE_MSGOUT_EXPECT;
609 fallthrough;
610
611 case async:
612 dev->period = info->ifcfg.asyncperiod / 4;
613 dev->sof = 0;
614 dev->stp = info->scsi.async_stp;
615 fas216_set_sync(info, info->SCpnt->device->id);
616 break;
617
618 case none:
619 break;
620 }
621}
622
623/**
624 * fas216_updateptrs - update data pointers after transfer suspended/paused
625 * @info: interface's local pointer to update
626 * @bytes_transferred: number of bytes transferred
627 *
628 * Update data pointers after transfer suspended/paused
629 */
630static void fas216_updateptrs(FAS216_Info *info, int bytes_transferred)
631{
632 struct scsi_pointer *SCp = &info->scsi.SCp;
633
634 fas216_checkmagic(info);
635
636 BUG_ON(bytes_transferred < 0);
637
638 SCp->phase -= bytes_transferred;
639
640 while (bytes_transferred != 0) {
641 if (SCp->this_residual > bytes_transferred)
642 break;
643 /*
644 * We have used up this buffer. Move on to the
645 * next buffer.
646 */
647 bytes_transferred -= SCp->this_residual;
648 if (!next_SCp(SCp) && bytes_transferred) {
649 printk(KERN_WARNING "scsi%d.%c: out of buffers\n",
650 info->host->host_no, '0' + info->SCpnt->device->id);
651 return;
652 }
653 }
654
655 SCp->this_residual -= bytes_transferred;
656 if (SCp->this_residual)
657 SCp->ptr += bytes_transferred;
658 else
659 SCp->ptr = NULL;
660}
661
662/**
663 * fas216_pio - transfer data off of/on to card using programmed IO
664 * @info: interface to transfer data to/from
665 * @direction: direction to transfer data (DMA_OUT/DMA_IN)
666 *
667 * Transfer data off of/on to card using programmed IO.
668 * Notes: this is incredibly slow.
669 */
670static void fas216_pio(FAS216_Info *info, fasdmadir_t direction)
671{
672 struct scsi_pointer *SCp = &info->scsi.SCp;
673
674 fas216_checkmagic(info);
675
676 if (direction == DMA_OUT)
677 fas216_writeb(info, REG_FF, get_next_SCp_byte(SCp));
678 else
679 put_next_SCp_byte(SCp, fas216_readb(info, REG_FF));
680
681 if (SCp->this_residual == 0)
682 next_SCp(SCp);
683}
684
685static void fas216_set_stc(FAS216_Info *info, unsigned int length)
686{
687 fas216_writeb(info, REG_STCL, length);
688 fas216_writeb(info, REG_STCM, length >> 8);
689 fas216_writeb(info, REG_STCH, length >> 16);
690}
691
692static unsigned int fas216_get_ctc(FAS216_Info *info)
693{
694 return fas216_readb(info, REG_CTCL) +
695 (fas216_readb(info, REG_CTCM) << 8) +
696 (fas216_readb(info, REG_CTCH) << 16);
697}
698
699/**
700 * fas216_cleanuptransfer - clean up after a transfer has completed.
701 * @info: interface to clean up
702 *
703 * Update the data pointers according to the number of bytes transferred
704 * on the SCSI bus.
705 */
706static void fas216_cleanuptransfer(FAS216_Info *info)
707{
708 unsigned long total, residual, fifo;
709 fasdmatype_t dmatype = info->dma.transfer_type;
710
711 info->dma.transfer_type = fasdma_none;
712
713 /*
714 * PIO transfers do not need to be cleaned up.
715 */
716 if (dmatype == fasdma_pio || dmatype == fasdma_none)
717 return;
718
719 if (dmatype == fasdma_real_all)
720 total = info->scsi.SCp.phase;
721 else
722 total = info->scsi.SCp.this_residual;
723
724 residual = fas216_get_ctc(info);
725
726 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
727
728 fas216_log(info, LOG_BUFFER, "cleaning up from previous "
729 "transfer: length 0x%06x, residual 0x%x, fifo %d",
730 total, residual, fifo);
731
732 /*
733 * If we were performing Data-Out, the transfer counter
734 * counts down each time a byte is transferred by the
735 * host to the FIFO. This means we must include the
736 * bytes left in the FIFO from the transfer counter.
737 */
738 if (info->scsi.phase == PHASE_DATAOUT)
739 residual += fifo;
740
741 fas216_updateptrs(info, total - residual);
742}
743
744/**
745 * fas216_transfer - Perform a DMA/PIO transfer off of/on to card
746 * @info: interface from which device disconnected from
747 *
748 * Start a DMA/PIO transfer off of/on to card
749 */
750static void fas216_transfer(FAS216_Info *info)
751{
752 fasdmadir_t direction;
753 fasdmatype_t dmatype;
754
755 fas216_log(info, LOG_BUFFER,
756 "starttransfer: buffer %p length 0x%06x reqlen 0x%06x",
757 info->scsi.SCp.ptr, info->scsi.SCp.this_residual,
758 info->scsi.SCp.phase);
759
760 if (!info->scsi.SCp.ptr) {
761 fas216_log(info, LOG_ERROR, "null buffer passed to "
762 "fas216_starttransfer");
763 print_SCp(&info->scsi.SCp, "SCp: ", "\n");
764 print_SCp(arm_scsi_pointer(info->SCpnt), "Cmnd SCp: ", "\n");
765 return;
766 }
767
768 /*
769 * If we have a synchronous transfer agreement in effect, we must
770 * use DMA mode. If we are using asynchronous transfers, we may
771 * use DMA mode or PIO mode.
772 */
773 if (info->device[info->SCpnt->device->id].sof)
774 dmatype = fasdma_real_all;
775 else
776 dmatype = fasdma_pio;
777
778 if (info->scsi.phase == PHASE_DATAOUT)
779 direction = DMA_OUT;
780 else
781 direction = DMA_IN;
782
783 if (info->dma.setup)
784 dmatype = info->dma.setup(info->host, &info->scsi.SCp,
785 direction, dmatype);
786 info->dma.transfer_type = dmatype;
787
788 if (dmatype == fasdma_real_all)
789 fas216_set_stc(info, info->scsi.SCp.phase);
790 else
791 fas216_set_stc(info, info->scsi.SCp.this_residual);
792
793 switch (dmatype) {
794 case fasdma_pio:
795 fas216_log(info, LOG_BUFFER, "PIO transfer");
796 fas216_writeb(info, REG_SOF, 0);
797 fas216_writeb(info, REG_STP, info->scsi.async_stp);
798 fas216_cmd(info, CMD_TRANSFERINFO);
799 fas216_pio(info, direction);
800 break;
801
802 case fasdma_pseudo:
803 fas216_log(info, LOG_BUFFER, "pseudo transfer");
804 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
805 info->dma.pseudo(info->host, &info->scsi.SCp,
806 direction, info->SCpnt->transfersize);
807 break;
808
809 case fasdma_real_block:
810 fas216_log(info, LOG_BUFFER, "block dma transfer");
811 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
812 break;
813
814 case fasdma_real_all:
815 fas216_log(info, LOG_BUFFER, "total dma transfer");
816 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
817 break;
818
819 default:
820 fas216_log(info, LOG_BUFFER | LOG_ERROR,
821 "invalid FAS216 DMA type");
822 break;
823 }
824}
825
826/**
827 * fas216_stoptransfer - Stop a DMA transfer onto / off of the card
828 * @info: interface from which device disconnected from
829 *
830 * Called when we switch away from DATA IN or DATA OUT phases.
831 */
832static void fas216_stoptransfer(FAS216_Info *info)
833{
834 fas216_checkmagic(info);
835
836 if (info->dma.transfer_type == fasdma_real_all ||
837 info->dma.transfer_type == fasdma_real_block)
838 info->dma.stop(info->host, &info->scsi.SCp);
839
840 fas216_cleanuptransfer(info);
841
842 if (info->scsi.phase == PHASE_DATAIN) {
843 unsigned int fifo;
844
845 /*
846 * If we were performing Data-In, then the FIFO counter
847 * contains the number of bytes not transferred via DMA
848 * from the on-board FIFO. Read them manually.
849 */
850 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
851 while (fifo && info->scsi.SCp.ptr) {
852 *info->scsi.SCp.ptr = fas216_readb(info, REG_FF);
853 fas216_updateptrs(info, 1);
854 fifo--;
855 }
856 } else {
857 /*
858 * After a Data-Out phase, there may be unsent
859 * bytes left in the FIFO. Flush them out.
860 */
861 fas216_cmd(info, CMD_FLUSHFIFO);
862 }
863}
864
865static void fas216_aborttransfer(FAS216_Info *info)
866{
867 fas216_checkmagic(info);
868
869 if (info->dma.transfer_type == fasdma_real_all ||
870 info->dma.transfer_type == fasdma_real_block)
871 info->dma.stop(info->host, &info->scsi.SCp);
872
873 info->dma.transfer_type = fasdma_none;
874 fas216_cmd(info, CMD_FLUSHFIFO);
875}
876
877static void fas216_kick(FAS216_Info *info);
878
879/**
880 * fas216_disconnected_intr - handle device disconnection
881 * @info: interface from which device disconnected from
882 *
883 * Handle device disconnection
884 */
885static void fas216_disconnect_intr(FAS216_Info *info)
886{
887 unsigned long flags;
888
889 fas216_checkmagic(info);
890
891 fas216_log(info, LOG_CONNECT, "disconnect phase=%02x",
892 info->scsi.phase);
893
894 msgqueue_flush(&info->scsi.msgs);
895
896 switch (info->scsi.phase) {
897 case PHASE_SELECTION: /* while selecting - no target */
898 case PHASE_SELSTEPS:
899 fas216_done(info, DID_NO_CONNECT);
900 break;
901
902 case PHASE_MSGIN_DISCONNECT: /* message in - disconnecting */
903 info->scsi.disconnectable = 1;
904 info->scsi.phase = PHASE_IDLE;
905 info->stats.disconnects += 1;
906 spin_lock_irqsave(&info->host_lock, flags);
907 if (info->scsi.phase == PHASE_IDLE)
908 fas216_kick(info);
909 spin_unlock_irqrestore(&info->host_lock, flags);
910 break;
911
912 case PHASE_DONE: /* at end of command - complete */
913 fas216_done(info, DID_OK);
914 break;
915
916 case PHASE_MSGOUT: /* message out - possible ABORT message */
917 if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) {
918 info->scsi.aborting = 0;
919 fas216_done(info, DID_ABORT);
920 break;
921 }
922 fallthrough;
923
924 default: /* huh? */
925 printk(KERN_ERR "scsi%d.%c: unexpected disconnect in phase %s\n",
926 info->host->host_no, fas216_target(info), fas216_drv_phase(info));
927 print_debug_list();
928 fas216_stoptransfer(info);
929 fas216_done(info, DID_ERROR);
930 break;
931 }
932}
933
934/**
935 * fas216_reselected_intr - start reconnection of a device
936 * @info: interface which was reselected
937 *
938 * Start reconnection of a device
939 */
940static void
941fas216_reselected_intr(FAS216_Info *info)
942{
943 unsigned int cfis, i;
944 unsigned char msg[4];
945 unsigned char target, lun, tag;
946
947 fas216_checkmagic(info);
948
949 WARN_ON(info->scsi.phase == PHASE_SELECTION ||
950 info->scsi.phase == PHASE_SELSTEPS);
951
952 cfis = fas216_readb(info, REG_CFIS);
953
954 fas216_log(info, LOG_CONNECT, "reconnect phase=%02x cfis=%02x",
955 info->scsi.phase, cfis);
956
957 cfis &= CFIS_CF;
958
959 if (cfis < 2 || cfis > 4) {
960 printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n",
961 info->host->host_no);
962 goto bad_message;
963 }
964
965 for (i = 0; i < cfis; i++)
966 msg[i] = fas216_readb(info, REG_FF);
967
968 if (!(msg[0] & (1 << info->host->this_id)) ||
969 !(msg[1] & 0x80))
970 goto initiator_error;
971
972 target = msg[0] & ~(1 << info->host->this_id);
973 target = ffs(target) - 1;
974 lun = msg[1] & 7;
975 tag = 0;
976
977 if (cfis >= 3) {
978 if (msg[2] != SIMPLE_QUEUE_TAG)
979 goto initiator_error;
980
981 tag = msg[3];
982 }
983
984 /* set up for synchronous transfers */
985 fas216_writeb(info, REG_SDID, target);
986 fas216_set_sync(info, target);
987 msgqueue_flush(&info->scsi.msgs);
988
989 fas216_log(info, LOG_CONNECT, "Reconnected: target %1x lun %1x tag %02x",
990 target, lun, tag);
991
992 if (info->scsi.disconnectable && info->SCpnt) {
993 info->scsi.disconnectable = 0;
994 if (info->SCpnt->device->id == target &&
995 info->SCpnt->device->lun == lun &&
996 scsi_cmd_to_rq(info->SCpnt)->tag == tag) {
997 fas216_log(info, LOG_CONNECT, "reconnected previously executing command");
998 } else {
999 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
1000 fas216_log(info, LOG_CONNECT, "had to move command to disconnected queue");
1001 info->SCpnt = NULL;
1002 }
1003 }
1004 if (!info->SCpnt) {
1005 info->SCpnt = queue_remove_tgtluntag(&info->queues.disconnected,
1006 target, lun, tag);
1007 fas216_log(info, LOG_CONNECT, "had to get command");
1008 }
1009
1010 if (info->SCpnt) {
1011 /*
1012 * Restore data pointer from SAVED data pointer
1013 */
1014 info->scsi.SCp = *arm_scsi_pointer(info->SCpnt);
1015
1016 fas216_log(info, LOG_CONNECT, "data pointers: [%p, %X]",
1017 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1018 info->scsi.phase = PHASE_MSGIN;
1019 } else {
1020 /*
1021 * Our command structure not found - abort the
1022 * command on the target. Since we have no
1023 * record of this command, we can't send
1024 * an INITIATOR DETECTED ERROR message.
1025 */
1026 fas216_cmd(info, CMD_SETATN);
1027
1028#if 0
1029 if (tag)
1030 msgqueue_addmsg(&info->scsi.msgs, 2, ABORT_TAG, tag);
1031 else
1032#endif
1033 msgqueue_addmsg(&info->scsi.msgs, 1, ABORT);
1034 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1035 info->scsi.aborting = 1;
1036 }
1037
1038 fas216_cmd(info, CMD_MSGACCEPTED);
1039 return;
1040
1041 initiator_error:
1042 printk(KERN_ERR "scsi%d.H: error during reselection: bytes",
1043 info->host->host_no);
1044 for (i = 0; i < cfis; i++)
1045 printk(" %02x", msg[i]);
1046 printk("\n");
1047 bad_message:
1048 fas216_cmd(info, CMD_SETATN);
1049 msgqueue_flush(&info->scsi.msgs);
1050 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1051 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1052 fas216_cmd(info, CMD_MSGACCEPTED);
1053}
1054
1055static void fas216_parse_message(FAS216_Info *info, unsigned char *message, int msglen)
1056{
1057 struct scsi_pointer *scsi_pointer;
1058 int i;
1059
1060 switch (message[0]) {
1061 case COMMAND_COMPLETE:
1062 if (msglen != 1)
1063 goto unrecognised;
1064
1065 printk(KERN_ERR "scsi%d.%c: command complete with no "
1066 "status in MESSAGE_IN?\n",
1067 info->host->host_no, fas216_target(info));
1068 break;
1069
1070 case SAVE_POINTERS:
1071 if (msglen != 1)
1072 goto unrecognised;
1073
1074 /*
1075 * Save current data pointer to SAVED data pointer
1076 * SCSI II standard says that we must not acknowledge
1077 * this until we have really saved pointers.
1078 * NOTE: we DO NOT save the command nor status pointers
1079 * as required by the SCSI II standard. These always
1080 * point to the start of their respective areas.
1081 */
1082 scsi_pointer = arm_scsi_pointer(info->SCpnt);
1083 *scsi_pointer = info->scsi.SCp;
1084 scsi_pointer->sent_command = 0;
1085 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
1086 "save data pointers: [%p, %X]",
1087 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1088 break;
1089
1090 case RESTORE_POINTERS:
1091 if (msglen != 1)
1092 goto unrecognised;
1093
1094 /*
1095 * Restore current data pointer from SAVED data pointer
1096 */
1097 info->scsi.SCp = *arm_scsi_pointer(info->SCpnt);
1098 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
1099 "restore data pointers: [%p, 0x%x]",
1100 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1101 break;
1102
1103 case DISCONNECT:
1104 if (msglen != 1)
1105 goto unrecognised;
1106
1107 info->scsi.phase = PHASE_MSGIN_DISCONNECT;
1108 break;
1109
1110 case MESSAGE_REJECT:
1111 if (msglen != 1)
1112 goto unrecognised;
1113
1114 switch (fas216_get_last_msg(info, info->scsi.msgin_fifo)) {
1115 case EXTENDED_MESSAGE | EXTENDED_SDTR << 8:
1116 fas216_handlesync(info, message);
1117 break;
1118
1119 default:
1120 fas216_log(info, 0, "reject, last message 0x%04x",
1121 fas216_get_last_msg(info, info->scsi.msgin_fifo));
1122 }
1123 break;
1124
1125 case NOP:
1126 break;
1127
1128 case EXTENDED_MESSAGE:
1129 if (msglen < 3)
1130 goto unrecognised;
1131
1132 switch (message[2]) {
1133 case EXTENDED_SDTR: /* Sync transfer negotiation request/reply */
1134 fas216_handlesync(info, message);
1135 break;
1136
1137 default:
1138 goto unrecognised;
1139 }
1140 break;
1141
1142 default:
1143 goto unrecognised;
1144 }
1145 return;
1146
1147unrecognised:
1148 fas216_log(info, 0, "unrecognised message, rejecting");
1149 printk("scsi%d.%c: message was", info->host->host_no, fas216_target(info));
1150 for (i = 0; i < msglen; i++)
1151 printk("%s%02X", i & 31 ? " " : "\n ", message[i]);
1152 printk("\n");
1153
1154 /*
1155 * Something strange seems to be happening here -
1156 * I can't use SETATN since the chip gives me an
1157 * invalid command interrupt when I do. Weird.
1158 */
1159fas216_cmd(info, CMD_NOP);
1160fas216_dumpstate(info);
1161 fas216_cmd(info, CMD_SETATN);
1162 msgqueue_flush(&info->scsi.msgs);
1163 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
1164 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1165fas216_dumpstate(info);
1166}
1167
1168static int fas216_wait_cmd(FAS216_Info *info, int cmd)
1169{
1170 int tout;
1171 int stat;
1172
1173 fas216_cmd(info, cmd);
1174
1175 for (tout = 1000; tout; tout -= 1) {
1176 stat = fas216_readb(info, REG_STAT);
1177 if (stat & (STAT_INT|STAT_PARITYERROR))
1178 break;
1179 udelay(1);
1180 }
1181
1182 return stat;
1183}
1184
1185static int fas216_get_msg_byte(FAS216_Info *info)
1186{
1187 unsigned int stat = fas216_wait_cmd(info, CMD_MSGACCEPTED);
1188
1189 if ((stat & STAT_INT) == 0)
1190 goto timedout;
1191
1192 if ((stat & STAT_BUSMASK) != STAT_MESGIN)
1193 goto unexpected_phase_change;
1194
1195 fas216_readb(info, REG_INST);
1196
1197 stat = fas216_wait_cmd(info, CMD_TRANSFERINFO);
1198
1199 if ((stat & STAT_INT) == 0)
1200 goto timedout;
1201
1202 if (stat & STAT_PARITYERROR)
1203 goto parity_error;
1204
1205 if ((stat & STAT_BUSMASK) != STAT_MESGIN)
1206 goto unexpected_phase_change;
1207
1208 fas216_readb(info, REG_INST);
1209
1210 return fas216_readb(info, REG_FF);
1211
1212timedout:
1213 fas216_log(info, LOG_ERROR, "timed out waiting for message byte");
1214 return -1;
1215
1216unexpected_phase_change:
1217 fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat);
1218 return -2;
1219
1220parity_error:
1221 fas216_log(info, LOG_ERROR, "parity error during message in phase");
1222 return -3;
1223}
1224
1225/**
1226 * fas216_message - handle a function done interrupt from FAS216 chip
1227 * @info: interface which caused function done interrupt
1228 *
1229 * Handle a function done interrupt from FAS216 chip
1230 */
1231static void fas216_message(FAS216_Info *info)
1232{
1233 unsigned char *message = info->scsi.message;
1234 unsigned int msglen = 1;
1235 int msgbyte = 0;
1236
1237 fas216_checkmagic(info);
1238
1239 message[0] = fas216_readb(info, REG_FF);
1240
1241 if (message[0] == EXTENDED_MESSAGE) {
1242 msgbyte = fas216_get_msg_byte(info);
1243
1244 if (msgbyte >= 0) {
1245 message[1] = msgbyte;
1246
1247 for (msglen = 2; msglen < message[1] + 2; msglen++) {
1248 msgbyte = fas216_get_msg_byte(info);
1249
1250 if (msgbyte >= 0)
1251 message[msglen] = msgbyte;
1252 else
1253 break;
1254 }
1255 }
1256 }
1257
1258 if (msgbyte == -3)
1259 goto parity_error;
1260
1261#ifdef DEBUG_MESSAGES
1262 {
1263 int i;
1264
1265 printk("scsi%d.%c: message in: ",
1266 info->host->host_no, fas216_target(info));
1267 for (i = 0; i < msglen; i++)
1268 printk("%02X ", message[i]);
1269 printk("\n");
1270 }
1271#endif
1272
1273 fas216_parse_message(info, message, msglen);
1274 fas216_cmd(info, CMD_MSGACCEPTED);
1275 return;
1276
1277parity_error:
1278 fas216_cmd(info, CMD_SETATN);
1279 msgqueue_flush(&info->scsi.msgs);
1280 msgqueue_addmsg(&info->scsi.msgs, 1, MSG_PARITY_ERROR);
1281 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1282 fas216_cmd(info, CMD_MSGACCEPTED);
1283 return;
1284}
1285
1286/**
1287 * fas216_send_command - send command after all message bytes have been sent
1288 * @info: interface which caused bus service
1289 *
1290 * Send a command to a target after all message bytes have been sent
1291 */
1292static void fas216_send_command(FAS216_Info *info)
1293{
1294 int i;
1295
1296 fas216_checkmagic(info);
1297
1298 fas216_cmd(info, CMD_NOP|CMD_WITHDMA);
1299 fas216_cmd(info, CMD_FLUSHFIFO);
1300
1301 /* load command */
1302 for (i = info->scsi.SCp.sent_command; i < info->SCpnt->cmd_len; i++)
1303 fas216_writeb(info, REG_FF, info->SCpnt->cmnd[i]);
1304
1305 fas216_cmd(info, CMD_TRANSFERINFO);
1306
1307 info->scsi.phase = PHASE_COMMAND;
1308}
1309
1310/**
1311 * fas216_send_messageout - handle bus service to send a message
1312 * @info: interface which caused bus service
1313 *
1314 * Handle bus service to send a message.
1315 * Note: We do not allow the device to change the data direction!
1316 */
1317static void fas216_send_messageout(FAS216_Info *info, int start)
1318{
1319 unsigned int tot_msglen = msgqueue_msglength(&info->scsi.msgs);
1320
1321 fas216_checkmagic(info);
1322
1323 fas216_cmd(info, CMD_FLUSHFIFO);
1324
1325 if (tot_msglen) {
1326 struct message *msg;
1327 int msgnr = 0;
1328
1329 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1330 int i;
1331
1332 for (i = start; i < msg->length; i++)
1333 fas216_writeb(info, REG_FF, msg->msg[i]);
1334
1335 msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
1336 start = 0;
1337 }
1338 } else
1339 fas216_writeb(info, REG_FF, NOP);
1340
1341 fas216_cmd(info, CMD_TRANSFERINFO);
1342
1343 info->scsi.phase = PHASE_MSGOUT;
1344}
1345
1346/**
1347 * fas216_busservice_intr - handle bus service interrupt from FAS216 chip
1348 * @info: interface which caused bus service interrupt
1349 * @stat: Status register contents
1350 * @is: SCSI Status register contents
1351 *
1352 * Handle a bus service interrupt from FAS216 chip
1353 */
1354static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
1355{
1356 fas216_checkmagic(info);
1357
1358 fas216_log(info, LOG_BUSSERVICE,
1359 "bus service: stat=%02x is=%02x phase=%02x",
1360 stat, is, info->scsi.phase);
1361
1362 switch (info->scsi.phase) {
1363 case PHASE_SELECTION:
1364 if ((is & IS_BITS) != IS_MSGBYTESENT)
1365 goto bad_is;
1366 break;
1367
1368 case PHASE_SELSTEPS:
1369 switch (is & IS_BITS) {
1370 case IS_SELARB:
1371 case IS_MSGBYTESENT:
1372 goto bad_is;
1373
1374 case IS_NOTCOMMAND:
1375 case IS_EARLYPHASE:
1376 if ((stat & STAT_BUSMASK) == STAT_MESGIN)
1377 break;
1378 goto bad_is;
1379
1380 case IS_COMPLETE:
1381 break;
1382 }
1383 break;
1384
1385 default:
1386 break;
1387 }
1388
1389 fas216_cmd(info, CMD_NOP);
1390
1391#define STATE(st,ph) ((ph) << 3 | (st))
1392 /* This table describes the legal SCSI state transitions,
1393 * as described by the SCSI II spec.
1394 */
1395 switch (STATE(stat & STAT_BUSMASK, info->scsi.phase)) {
1396 case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In */
1397 case STATE(STAT_DATAIN, PHASE_MSGOUT): /* Message Out -> Data In */
1398 case STATE(STAT_DATAIN, PHASE_COMMAND): /* Command -> Data In */
1399 case STATE(STAT_DATAIN, PHASE_MSGIN): /* Message In -> Data In */
1400 info->scsi.phase = PHASE_DATAIN;
1401 fas216_transfer(info);
1402 return;
1403
1404 case STATE(STAT_DATAIN, PHASE_DATAIN): /* Data In -> Data In */
1405 case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out -> Data Out */
1406 fas216_cleanuptransfer(info);
1407 fas216_transfer(info);
1408 return;
1409
1410 case STATE(STAT_DATAOUT, PHASE_SELSTEPS):/* Sel w/ steps-> Data Out */
1411 case STATE(STAT_DATAOUT, PHASE_MSGOUT): /* Message Out -> Data Out */
1412 case STATE(STAT_DATAOUT, PHASE_COMMAND):/* Command -> Data Out */
1413 case STATE(STAT_DATAOUT, PHASE_MSGIN): /* Message In -> Data Out */
1414 fas216_cmd(info, CMD_FLUSHFIFO);
1415 info->scsi.phase = PHASE_DATAOUT;
1416 fas216_transfer(info);
1417 return;
1418
1419 case STATE(STAT_STATUS, PHASE_DATAOUT): /* Data Out -> Status */
1420 case STATE(STAT_STATUS, PHASE_DATAIN): /* Data In -> Status */
1421 fas216_stoptransfer(info);
1422 fallthrough;
1423
1424 case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status */
1425 case STATE(STAT_STATUS, PHASE_MSGOUT): /* Message Out -> Status */
1426 case STATE(STAT_STATUS, PHASE_COMMAND): /* Command -> Status */
1427 case STATE(STAT_STATUS, PHASE_MSGIN): /* Message In -> Status */
1428 fas216_cmd(info, CMD_INITCMDCOMPLETE);
1429 info->scsi.phase = PHASE_STATUS;
1430 return;
1431
1432 case STATE(STAT_MESGIN, PHASE_DATAOUT): /* Data Out -> Message In */
1433 case STATE(STAT_MESGIN, PHASE_DATAIN): /* Data In -> Message In */
1434 fas216_stoptransfer(info);
1435 fallthrough;
1436
1437 case STATE(STAT_MESGIN, PHASE_COMMAND): /* Command -> Message In */
1438 case STATE(STAT_MESGIN, PHASE_SELSTEPS):/* Sel w/ steps -> Message In */
1439 case STATE(STAT_MESGIN, PHASE_MSGOUT): /* Message Out -> Message In */
1440 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1441 fas216_cmd(info, CMD_FLUSHFIFO);
1442 fas216_cmd(info, CMD_TRANSFERINFO);
1443 info->scsi.phase = PHASE_MSGIN;
1444 return;
1445
1446 case STATE(STAT_MESGIN, PHASE_MSGIN):
1447 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1448 fas216_cmd(info, CMD_TRANSFERINFO);
1449 return;
1450
1451 case STATE(STAT_COMMAND, PHASE_MSGOUT): /* Message Out -> Command */
1452 case STATE(STAT_COMMAND, PHASE_MSGIN): /* Message In -> Command */
1453 fas216_send_command(info);
1454 info->scsi.phase = PHASE_COMMAND;
1455 return;
1456
1457
1458 /*
1459 * Selection -> Message Out
1460 */
1461 case STATE(STAT_MESGOUT, PHASE_SELECTION):
1462 fas216_send_messageout(info, 1);
1463 return;
1464
1465 /*
1466 * Message Out -> Message Out
1467 */
1468 case STATE(STAT_MESGOUT, PHASE_SELSTEPS):
1469 case STATE(STAT_MESGOUT, PHASE_MSGOUT):
1470 /*
1471 * If we get another message out phase, this usually
1472 * means some parity error occurred. Resend complete
1473 * set of messages. If we have more than one byte to
1474 * send, we need to assert ATN again.
1475 */
1476 if (info->device[info->SCpnt->device->id].parity_check) {
1477 /*
1478 * We were testing... good, the device
1479 * supports parity checking.
1480 */
1481 info->device[info->SCpnt->device->id].parity_check = 0;
1482 info->device[info->SCpnt->device->id].parity_enabled = 1;
1483 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1484 }
1485
1486 if (msgqueue_msglength(&info->scsi.msgs) > 1)
1487 fas216_cmd(info, CMD_SETATN);
1488 fallthrough;
1489
1490 /*
1491 * Any -> Message Out
1492 */
1493 case STATE(STAT_MESGOUT, PHASE_MSGOUT_EXPECT):
1494 fas216_send_messageout(info, 0);
1495 return;
1496
1497 /* Error recovery rules.
1498 * These either attempt to abort or retry the operation.
1499 * TODO: we need more of these
1500 */
1501 case STATE(STAT_COMMAND, PHASE_COMMAND):/* Command -> Command */
1502 /* error - we've sent out all the command bytes
1503 * we have.
1504 * NOTE: we need SAVE DATA POINTERS/RESTORE DATA POINTERS
1505 * to include the command bytes sent for this to work
1506 * correctly.
1507 */
1508 printk(KERN_ERR "scsi%d.%c: "
1509 "target trying to receive more command bytes\n",
1510 info->host->host_no, fas216_target(info));
1511 fas216_cmd(info, CMD_SETATN);
1512 fas216_set_stc(info, 15);
1513 fas216_cmd(info, CMD_PADBYTES | CMD_WITHDMA);
1514 msgqueue_flush(&info->scsi.msgs);
1515 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1516 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1517 return;
1518 }
1519
1520 if (info->scsi.phase == PHASE_MSGIN_DISCONNECT) {
1521 printk(KERN_ERR "scsi%d.%c: disconnect message received, but bus service %s?\n",
1522 info->host->host_no, fas216_target(info),
1523 fas216_bus_phase(stat));
1524 msgqueue_flush(&info->scsi.msgs);
1525 fas216_cmd(info, CMD_SETATN);
1526 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1527 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1528 info->scsi.aborting = 1;
1529 fas216_cmd(info, CMD_TRANSFERINFO);
1530 return;
1531 }
1532 printk(KERN_ERR "scsi%d.%c: bus phase %s after %s?\n",
1533 info->host->host_no, fas216_target(info),
1534 fas216_bus_phase(stat),
1535 fas216_drv_phase(info));
1536 print_debug_list();
1537 return;
1538
1539bad_is:
1540 fas216_log(info, 0, "bus service at step %d?", is & IS_BITS);
1541 fas216_dumpstate(info);
1542 print_debug_list();
1543
1544 fas216_done(info, DID_ERROR);
1545}
1546
1547/**
1548 * fas216_funcdone_intr - handle a function done interrupt from FAS216 chip
1549 * @info: interface which caused function done interrupt
1550 * @stat: Status register contents
1551 * @is: SCSI Status register contents
1552 *
1553 * Handle a function done interrupt from FAS216 chip
1554 */
1555static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
1556{
1557 unsigned int fifo_len = fas216_readb(info, REG_CFIS) & CFIS_CF;
1558
1559 fas216_checkmagic(info);
1560
1561 fas216_log(info, LOG_FUNCTIONDONE,
1562 "function done: stat=%02x is=%02x phase=%02x",
1563 stat, is, info->scsi.phase);
1564
1565 switch (info->scsi.phase) {
1566 case PHASE_STATUS: /* status phase - read status and msg */
1567 if (fifo_len != 2) {
1568 fas216_log(info, 0, "odd number of bytes in FIFO: %d", fifo_len);
1569 }
1570 /*
1571 * Read status then message byte.
1572 */
1573 info->scsi.SCp.Status = fas216_readb(info, REG_FF);
1574 info->scsi.SCp.Message = fas216_readb(info, REG_FF);
1575 info->scsi.phase = PHASE_DONE;
1576 fas216_cmd(info, CMD_MSGACCEPTED);
1577 break;
1578
1579 case PHASE_IDLE:
1580 case PHASE_SELECTION:
1581 case PHASE_SELSTEPS:
1582 break;
1583
1584 case PHASE_MSGIN: /* message in phase */
1585 if ((stat & STAT_BUSMASK) == STAT_MESGIN) {
1586 info->scsi.msgin_fifo = fifo_len;
1587 fas216_message(info);
1588 break;
1589 }
1590 fallthrough;
1591
1592 default:
1593 fas216_log(info, 0, "internal phase %s for function done?"
1594 " What do I do with this?",
1595 fas216_target(info), fas216_drv_phase(info));
1596 }
1597}
1598
1599static void fas216_bus_reset(FAS216_Info *info)
1600{
1601 neg_t sync_state;
1602 int i;
1603
1604 msgqueue_flush(&info->scsi.msgs);
1605
1606 sync_state = neg_invalid;
1607
1608#ifdef SCSI2_SYNC
1609 if (info->ifcfg.capabilities & (FASCAP_DMA|FASCAP_PSEUDODMA))
1610 sync_state = neg_wait;
1611#endif
1612
1613 info->scsi.phase = PHASE_IDLE;
1614 info->SCpnt = NULL; /* bug! */
1615 memset(&info->scsi.SCp, 0, sizeof(info->scsi.SCp));
1616
1617 for (i = 0; i < 8; i++) {
1618 info->device[i].disconnect_ok = info->ifcfg.disconnect_ok;
1619 info->device[i].sync_state = sync_state;
1620 info->device[i].period = info->ifcfg.asyncperiod / 4;
1621 info->device[i].stp = info->scsi.async_stp;
1622 info->device[i].sof = 0;
1623 info->device[i].wide_xfer = 0;
1624 }
1625
1626 info->rst_bus_status = 1;
1627 wake_up(&info->eh_wait);
1628}
1629
1630/**
1631 * fas216_intr - handle interrupts to progress a command
1632 * @info: interface to service
1633 *
1634 * Handle interrupts from the interface to progress a command
1635 */
1636irqreturn_t fas216_intr(FAS216_Info *info)
1637{
1638 unsigned char inst, is, stat;
1639 int handled = IRQ_NONE;
1640
1641 fas216_checkmagic(info);
1642
1643 stat = fas216_readb(info, REG_STAT);
1644 is = fas216_readb(info, REG_IS);
1645 inst = fas216_readb(info, REG_INST);
1646
1647 add_debug_list(stat, is, inst, info->scsi.phase);
1648
1649 if (stat & STAT_INT) {
1650 if (inst & INST_BUSRESET) {
1651 fas216_log(info, 0, "bus reset detected");
1652 fas216_bus_reset(info);
1653 scsi_report_bus_reset(info->host, 0);
1654 } else if (inst & INST_ILLEGALCMD) {
1655 fas216_log(info, LOG_ERROR, "illegal command given\n");
1656 fas216_dumpstate(info);
1657 print_debug_list();
1658 } else if (inst & INST_DISCONNECT)
1659 fas216_disconnect_intr(info);
1660 else if (inst & INST_RESELECTED) /* reselected */
1661 fas216_reselected_intr(info);
1662 else if (inst & INST_BUSSERVICE) /* bus service request */
1663 fas216_busservice_intr(info, stat, is);
1664 else if (inst & INST_FUNCDONE) /* function done */
1665 fas216_funcdone_intr(info, stat, is);
1666 else
1667 fas216_log(info, 0, "unknown interrupt received:"
1668 " phase %s inst %02X is %02X stat %02X",
1669 fas216_drv_phase(info), inst, is, stat);
1670 handled = IRQ_HANDLED;
1671 }
1672 return handled;
1673}
1674
1675static void __fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1676{
1677 int tot_msglen;
1678
1679 /* following what the ESP driver says */
1680 fas216_set_stc(info, 0);
1681 fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1682
1683 /* flush FIFO */
1684 fas216_cmd(info, CMD_FLUSHFIFO);
1685
1686 /* load bus-id and timeout */
1687 fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1688 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1689
1690 /* synchronous transfers */
1691 fas216_set_sync(info, SCpnt->device->id);
1692
1693 tot_msglen = msgqueue_msglength(&info->scsi.msgs);
1694
1695#ifdef DEBUG_MESSAGES
1696 {
1697 struct message *msg;
1698 int msgnr = 0, i;
1699
1700 printk("scsi%d.%c: message out: ",
1701 info->host->host_no, '0' + SCpnt->device->id);
1702 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1703 printk("{ ");
1704 for (i = 0; i < msg->length; i++)
1705 printk("%02x ", msg->msg[i]);
1706 printk("} ");
1707 }
1708 printk("\n");
1709 }
1710#endif
1711
1712 if (tot_msglen == 1 || tot_msglen == 3) {
1713 /*
1714 * We have an easy message length to send...
1715 */
1716 struct message *msg;
1717 int msgnr = 0, i;
1718
1719 info->scsi.phase = PHASE_SELSTEPS;
1720
1721 /* load message bytes */
1722 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1723 for (i = 0; i < msg->length; i++)
1724 fas216_writeb(info, REG_FF, msg->msg[i]);
1725 msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
1726 }
1727
1728 /* load command */
1729 for (i = 0; i < SCpnt->cmd_len; i++)
1730 fas216_writeb(info, REG_FF, SCpnt->cmnd[i]);
1731
1732 if (tot_msglen == 1)
1733 fas216_cmd(info, CMD_SELECTATN);
1734 else
1735 fas216_cmd(info, CMD_SELECTATN3);
1736 } else {
1737 /*
1738 * We have an unusual number of message bytes to send.
1739 * Load first byte into fifo, and issue SELECT with ATN and
1740 * stop steps.
1741 */
1742 struct message *msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1743
1744 fas216_writeb(info, REG_FF, msg->msg[0]);
1745 msg->fifo = 1;
1746
1747 fas216_cmd(info, CMD_SELECTATNSTOP);
1748 }
1749}
1750
1751/*
1752 * Decide whether we need to perform a parity test on this device.
1753 * Can also be used to force parity error conditions during initial
1754 * information transfer phase (message out) for test purposes.
1755 */
1756static int parity_test(FAS216_Info *info, int target)
1757{
1758#if 0
1759 if (target == 3) {
1760 info->device[target].parity_check = 0;
1761 return 1;
1762 }
1763#endif
1764 return info->device[target].parity_check;
1765}
1766
1767static void fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1768{
1769 int disconnect_ok;
1770
1771 /*
1772 * claim host busy
1773 */
1774 info->scsi.phase = PHASE_SELECTION;
1775 info->scsi.SCp = *arm_scsi_pointer(SCpnt);
1776 info->SCpnt = SCpnt;
1777 info->dma.transfer_type = fasdma_none;
1778
1779 if (parity_test(info, SCpnt->device->id))
1780 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_PTE);
1781 else
1782 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1783
1784 /*
1785 * Don't allow request sense commands to disconnect.
1786 */
1787 disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE &&
1788 info->device[SCpnt->device->id].disconnect_ok;
1789
1790 /*
1791 * build outgoing message bytes
1792 */
1793 msgqueue_flush(&info->scsi.msgs);
1794 msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->device->lun));
1795
1796 /*
1797 * add tag message if required
1798 */
1799 if (SCpnt->device->simple_tags)
1800 msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG,
1801 scsi_cmd_to_rq(SCpnt)->tag);
1802
1803 do {
1804#ifdef SCSI2_SYNC
1805 if ((info->device[SCpnt->device->id].sync_state == neg_wait ||
1806 info->device[SCpnt->device->id].sync_state == neg_complete) &&
1807 (SCpnt->cmnd[0] == REQUEST_SENSE ||
1808 SCpnt->cmnd[0] == INQUIRY)) {
1809 info->device[SCpnt->device->id].sync_state = neg_inprogress;
1810 msgqueue_addmsg(&info->scsi.msgs, 5,
1811 EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
1812 1000 / info->ifcfg.clockrate,
1813 info->ifcfg.sync_max_depth);
1814 break;
1815 }
1816#endif
1817 } while (0);
1818
1819 __fas216_start_command(info, SCpnt);
1820}
1821
1822static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1823{
1824 set_bit(SCpnt->device->id * 8 +
1825 (u8)(SCpnt->device->lun & 0x7), info->busyluns);
1826
1827 info->stats.removes += 1;
1828 switch (SCpnt->cmnd[0]) {
1829 case WRITE_6:
1830 case WRITE_10:
1831 case WRITE_12:
1832 info->stats.writes += 1;
1833 break;
1834 case READ_6:
1835 case READ_10:
1836 case READ_12:
1837 info->stats.reads += 1;
1838 break;
1839 default:
1840 info->stats.miscs += 1;
1841 break;
1842 }
1843}
1844
1845static void fas216_do_bus_device_reset(FAS216_Info *info,
1846 struct scsi_cmnd *SCpnt)
1847{
1848 struct message *msg;
1849
1850 /*
1851 * claim host busy
1852 */
1853 info->scsi.phase = PHASE_SELECTION;
1854 info->scsi.SCp = *arm_scsi_pointer(SCpnt);
1855 info->SCpnt = SCpnt;
1856 info->dma.transfer_type = fasdma_none;
1857
1858 fas216_log(info, LOG_ERROR, "sending bus device reset");
1859
1860 msgqueue_flush(&info->scsi.msgs);
1861 msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET);
1862
1863 /* following what the ESP driver says */
1864 fas216_set_stc(info, 0);
1865 fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1866
1867 /* flush FIFO */
1868 fas216_cmd(info, CMD_FLUSHFIFO);
1869
1870 /* load bus-id and timeout */
1871 fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1872 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1873
1874 /* synchronous transfers */
1875 fas216_set_sync(info, SCpnt->device->id);
1876
1877 msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1878
1879 fas216_writeb(info, REG_FF, BUS_DEVICE_RESET);
1880 msg->fifo = 1;
1881
1882 fas216_cmd(info, CMD_SELECTATNSTOP);
1883}
1884
1885/**
1886 * fas216_kick - kick a command to the interface
1887 * @info: our host interface to kick
1888 *
1889 * Kick a command to the interface, interface should be idle.
1890 * Notes: Interrupts are always disabled!
1891 */
1892static void fas216_kick(FAS216_Info *info)
1893{
1894 struct scsi_cmnd *SCpnt = NULL;
1895#define TYPE_OTHER 0
1896#define TYPE_RESET 1
1897#define TYPE_QUEUE 2
1898 int where_from = TYPE_OTHER;
1899
1900 fas216_checkmagic(info);
1901
1902 /*
1903 * Obtain the next command to process.
1904 */
1905 do {
1906 if (info->rstSCpnt) {
1907 SCpnt = info->rstSCpnt;
1908 /* don't remove it */
1909 where_from = TYPE_RESET;
1910 break;
1911 }
1912
1913 if (info->reqSCpnt) {
1914 SCpnt = info->reqSCpnt;
1915 info->reqSCpnt = NULL;
1916 break;
1917 }
1918
1919 if (info->origSCpnt) {
1920 SCpnt = info->origSCpnt;
1921 info->origSCpnt = NULL;
1922 break;
1923 }
1924
1925 /* retrieve next command */
1926 if (!SCpnt) {
1927 SCpnt = queue_remove_exclude(&info->queues.issue,
1928 info->busyluns);
1929 where_from = TYPE_QUEUE;
1930 break;
1931 }
1932 } while (0);
1933
1934 if (!SCpnt) {
1935 /*
1936 * no command pending, so enable reselection.
1937 */
1938 fas216_cmd(info, CMD_ENABLESEL);
1939 return;
1940 }
1941
1942 /*
1943 * We're going to start a command, so disable reselection
1944 */
1945 fas216_cmd(info, CMD_DISABLESEL);
1946
1947 if (info->scsi.disconnectable && info->SCpnt) {
1948 fas216_log(info, LOG_CONNECT,
1949 "moved command for %d to disconnected queue",
1950 info->SCpnt->device->id);
1951 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
1952 info->scsi.disconnectable = 0;
1953 info->SCpnt = NULL;
1954 }
1955
1956 fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt,
1957 "starting");
1958
1959 switch (where_from) {
1960 case TYPE_QUEUE:
1961 fas216_allocate_tag(info, SCpnt);
1962 fallthrough;
1963 case TYPE_OTHER:
1964 fas216_start_command(info, SCpnt);
1965 break;
1966 case TYPE_RESET:
1967 fas216_do_bus_device_reset(info, SCpnt);
1968 break;
1969 }
1970
1971 fas216_log(info, LOG_CONNECT, "select: data pointers [%p, %X]",
1972 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1973
1974 /*
1975 * should now get either DISCONNECT or
1976 * (FUNCTION DONE with BUS SERVICE) interrupt
1977 */
1978}
1979
1980/*
1981 * Clean up from issuing a BUS DEVICE RESET message to a device.
1982 */
1983static void fas216_devicereset_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
1984 unsigned int result)
1985{
1986 fas216_log(info, LOG_ERROR, "fas216 device reset complete");
1987
1988 info->rstSCpnt = NULL;
1989 info->rst_dev_status = 1;
1990 wake_up(&info->eh_wait);
1991}
1992
1993/**
1994 * fas216_rq_sns_done - Finish processing automatic request sense command
1995 * @info: interface that completed
1996 * @SCpnt: command that completed
1997 * @result: driver byte of result
1998 *
1999 * Finish processing automatic request sense command
2000 */
2001static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
2002 unsigned int result)
2003{
2004 struct scsi_pointer *scsi_pointer = arm_scsi_pointer(SCpnt);
2005
2006 fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
2007 "request sense complete, result=0x%04x%02x%02x",
2008 result, scsi_pointer->Message, scsi_pointer->Status);
2009
2010 if (result != DID_OK || scsi_pointer->Status != SAM_STAT_GOOD)
2011 /*
2012 * Something went wrong. Make sure that we don't
2013 * have valid data in the sense buffer that could
2014 * confuse the higher levels.
2015 */
2016 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2017//printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id);
2018//{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); }
2019 /*
2020 * Note that we don't set SCpnt->result, since that should
2021 * reflect the status of the command that we were asked by
2022 * the upper layers to process. This would have been set
2023 * correctly by fas216_std_done.
2024 */
2025 scsi_eh_restore_cmnd(SCpnt, &info->ses);
2026 fas216_cmd_priv(SCpnt)->scsi_done(SCpnt);
2027}
2028
2029/**
2030 * fas216_std_done - finish processing of standard command
2031 * @info: interface that completed
2032 * @SCpnt: command that completed
2033 * @result: driver byte of result
2034 *
2035 * Finish processing of standard command
2036 */
2037static void
2038fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result)
2039{
2040 struct scsi_pointer *scsi_pointer = arm_scsi_pointer(SCpnt);
2041
2042 info->stats.fins += 1;
2043
2044 set_host_byte(SCpnt, result);
2045 if (result == DID_OK)
2046 scsi_msg_to_host_byte(SCpnt, info->scsi.SCp.Message);
2047 set_status_byte(SCpnt, info->scsi.SCp.Status);
2048
2049 fas216_log_command(info, LOG_CONNECT, SCpnt,
2050 "command complete, result=0x%08x", SCpnt->result);
2051
2052 /*
2053 * If the driver detected an error, we're all done.
2054 */
2055 if (get_host_byte(SCpnt) != DID_OK)
2056 goto done;
2057
2058 /*
2059 * If the command returned CHECK_CONDITION or COMMAND_TERMINATED
2060 * status, request the sense information.
2061 */
2062 if (get_status_byte(SCpnt) == SAM_STAT_CHECK_CONDITION ||
2063 get_status_byte(SCpnt) == SAM_STAT_COMMAND_TERMINATED)
2064 goto request_sense;
2065
2066 /*
2067 * If the command did not complete with GOOD status,
2068 * we are all done here.
2069 */
2070 if (get_status_byte(SCpnt) != SAM_STAT_GOOD)
2071 goto done;
2072
2073 /*
2074 * We have successfully completed a command. Make sure that
2075 * we do not have any buffers left to transfer. The world
2076 * is not perfect, and we seem to occasionally hit this.
2077 * It can be indicative of a buggy driver, target or the upper
2078 * levels of the SCSI code.
2079 */
2080 if (info->scsi.SCp.ptr) {
2081 switch (SCpnt->cmnd[0]) {
2082 case INQUIRY:
2083 case START_STOP:
2084 case MODE_SENSE:
2085 break;
2086
2087 default:
2088 scmd_printk(KERN_ERR, SCpnt,
2089 "incomplete data transfer detected: res=%08X ptr=%p len=%X\n",
2090 SCpnt->result, info->scsi.SCp.ptr,
2091 info->scsi.SCp.this_residual);
2092 scsi_print_command(SCpnt);
2093 set_host_byte(SCpnt, DID_ERROR);
2094 goto request_sense;
2095 }
2096 }
2097
2098done:
2099 if (fas216_cmd_priv(SCpnt)->scsi_done) {
2100 fas216_cmd_priv(SCpnt)->scsi_done(SCpnt);
2101 return;
2102 }
2103
2104 panic("scsi%d.H: null scsi_done function in fas216_done",
2105 info->host->host_no);
2106
2107
2108request_sense:
2109 if (SCpnt->cmnd[0] == REQUEST_SENSE)
2110 goto done;
2111
2112 scsi_eh_prep_cmnd(SCpnt, &info->ses, NULL, 0, ~0);
2113 fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
2114 "requesting sense");
2115 init_SCp(SCpnt);
2116 scsi_pointer->Message = 0;
2117 scsi_pointer->Status = 0;
2118 SCpnt->host_scribble = (void *)fas216_rq_sns_done;
2119
2120 /*
2121 * Place this command into the high priority "request
2122 * sense" slot. This will be the very next command
2123 * executed, unless a target connects to us.
2124 */
2125 if (info->reqSCpnt)
2126 printk(KERN_WARNING "scsi%d.%c: losing request command\n",
2127 info->host->host_no, '0' + SCpnt->device->id);
2128 info->reqSCpnt = SCpnt;
2129}
2130
2131/**
2132 * fas216_done - complete processing for current command
2133 * @info: interface that completed
2134 * @result: driver byte of result
2135 *
2136 * Complete processing for current command
2137 */
2138static void fas216_done(FAS216_Info *info, unsigned int result)
2139{
2140 void (*fn)(FAS216_Info *, struct scsi_cmnd *, unsigned int);
2141 struct scsi_cmnd *SCpnt;
2142 unsigned long flags;
2143
2144 fas216_checkmagic(info);
2145
2146 if (!info->SCpnt)
2147 goto no_command;
2148
2149 SCpnt = info->SCpnt;
2150 info->SCpnt = NULL;
2151 info->scsi.phase = PHASE_IDLE;
2152
2153 if (info->scsi.aborting) {
2154 fas216_log(info, 0, "uncaught abort - returning DID_ABORT");
2155 result = DID_ABORT;
2156 info->scsi.aborting = 0;
2157 }
2158
2159 /*
2160 * Sanity check the completion - if we have zero bytes left
2161 * to transfer, we should not have a valid pointer.
2162 */
2163 if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) {
2164 scmd_printk(KERN_INFO, SCpnt,
2165 "zero bytes left to transfer, but buffer pointer still valid: ptr=%p len=%08x\n",
2166 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
2167 info->scsi.SCp.ptr = NULL;
2168 scsi_print_command(SCpnt);
2169 }
2170
2171 /*
2172 * Clear down this command as completed. If we need to request
2173 * the sense information, fas216_kick will re-assert the busy
2174 * status.
2175 */
2176 info->device[SCpnt->device->id].parity_check = 0;
2177 clear_bit(SCpnt->device->id * 8 +
2178 (u8)(SCpnt->device->lun & 0x7), info->busyluns);
2179
2180 fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble;
2181 fn(info, SCpnt, result);
2182
2183 if (info->scsi.irq) {
2184 spin_lock_irqsave(&info->host_lock, flags);
2185 if (info->scsi.phase == PHASE_IDLE)
2186 fas216_kick(info);
2187 spin_unlock_irqrestore(&info->host_lock, flags);
2188 }
2189 return;
2190
2191no_command:
2192 panic("scsi%d.H: null command in fas216_done",
2193 info->host->host_no);
2194}
2195
2196/**
2197 * fas216_queue_command_internal - queue a command for the adapter to process
2198 * @SCpnt: Command to queue
2199 * @done: done function to call once command is complete
2200 *
2201 * Queue a command for adapter to process.
2202 * Returns: 0 on success, else error.
2203 * Notes: io_request_lock is held, interrupts are disabled.
2204 */
2205static int fas216_queue_command_internal(struct scsi_cmnd *SCpnt,
2206 void (*done)(struct scsi_cmnd *))
2207{
2208 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2209 int result;
2210
2211 fas216_checkmagic(info);
2212
2213 fas216_log_command(info, LOG_CONNECT, SCpnt,
2214 "received command (%p)", SCpnt);
2215
2216 fas216_cmd_priv(SCpnt)->scsi_done = done;
2217 SCpnt->host_scribble = (void *)fas216_std_done;
2218 SCpnt->result = 0;
2219
2220 init_SCp(SCpnt);
2221
2222 info->stats.queues += 1;
2223
2224 spin_lock(&info->host_lock);
2225
2226 /*
2227 * Add command into execute queue and let it complete under
2228 * whatever scheme we're using.
2229 */
2230 result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt);
2231
2232 /*
2233 * If we successfully added the command,
2234 * kick the interface to get it moving.
2235 */
2236 if (result == 0 && info->scsi.phase == PHASE_IDLE)
2237 fas216_kick(info);
2238 spin_unlock(&info->host_lock);
2239
2240 fas216_log_target(info, LOG_CONNECT, -1, "queue %s",
2241 result ? "failure" : "success");
2242
2243 return result;
2244}
2245
2246static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt)
2247{
2248 return fas216_queue_command_internal(SCpnt, scsi_done);
2249}
2250
2251DEF_SCSI_QCMD(fas216_queue_command)
2252
2253/**
2254 * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command
2255 * @SCpnt: Command to wake
2256 *
2257 * Trigger restart of a waiting thread in fas216_command
2258 */
2259static void fas216_internal_done(struct scsi_cmnd *SCpnt)
2260{
2261 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2262
2263 fas216_checkmagic(info);
2264
2265 info->internal_done = 1;
2266}
2267
2268/**
2269 * fas216_noqueue_command - process a command for the adapter.
2270 * @SCpnt: Command to queue
2271 *
2272 * Queue a command for adapter to process.
2273 * Returns: scsi result code.
2274 * Notes: io_request_lock is held, interrupts are disabled.
2275 */
2276static int fas216_noqueue_command_lck(struct scsi_cmnd *SCpnt)
2277{
2278 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2279
2280 fas216_checkmagic(info);
2281
2282 /*
2283 * We should only be using this if we don't have an interrupt.
2284 * Provide some "incentive" to use the queueing code.
2285 */
2286 BUG_ON(info->scsi.irq);
2287
2288 info->internal_done = 0;
2289 fas216_queue_command_internal(SCpnt, fas216_internal_done);
2290
2291 /*
2292 * This wastes time, since we can't return until the command is
2293 * complete. We can't sleep either since we may get re-entered!
2294 * However, we must re-enable interrupts, or else we'll be
2295 * waiting forever.
2296 */
2297 spin_unlock_irq(info->host->host_lock);
2298
2299 while (!info->internal_done) {
2300 /*
2301 * If we don't have an IRQ, then we must poll the card for
2302 * it's interrupt, and use that to call this driver's
2303 * interrupt routine. That way, we keep the command
2304 * progressing. Maybe we can add some intelligence here
2305 * and go to sleep if we know that the device is going
2306 * to be some time (eg, disconnected).
2307 */
2308 if (fas216_readb(info, REG_STAT) & STAT_INT) {
2309 spin_lock_irq(info->host->host_lock);
2310 fas216_intr(info);
2311 spin_unlock_irq(info->host->host_lock);
2312 }
2313 }
2314
2315 spin_lock_irq(info->host->host_lock);
2316
2317 scsi_done(SCpnt);
2318
2319 return 0;
2320}
2321
2322DEF_SCSI_QCMD(fas216_noqueue_command)
2323
2324/*
2325 * Error handler timeout function. Indicate that we timed out,
2326 * and wake up any error handler process so it can continue.
2327 */
2328static void fas216_eh_timer(struct timer_list *t)
2329{
2330 FAS216_Info *info = from_timer(info, t, eh_timer);
2331
2332 fas216_log(info, LOG_ERROR, "error handling timed out\n");
2333
2334 del_timer(&info->eh_timer);
2335
2336 if (info->rst_bus_status == 0)
2337 info->rst_bus_status = -1;
2338 if (info->rst_dev_status == 0)
2339 info->rst_dev_status = -1;
2340
2341 wake_up(&info->eh_wait);
2342}
2343
2344enum res_find {
2345 res_failed, /* not found */
2346 res_success, /* command on issue queue */
2347 res_hw_abort /* command on disconnected dev */
2348};
2349
2350/**
2351 * fas216_do_abort - decide how to abort a command
2352 * @SCpnt: command to abort
2353 *
2354 * Decide how to abort a command.
2355 * Returns: abort status
2356 */
2357static enum res_find fas216_find_command(FAS216_Info *info,
2358 struct scsi_cmnd *SCpnt)
2359{
2360 enum res_find res = res_failed;
2361
2362 if (queue_remove_cmd(&info->queues.issue, SCpnt)) {
2363 /*
2364 * The command was on the issue queue, and has not been
2365 * issued yet. We can remove the command from the queue,
2366 * and acknowledge the abort. Neither the device nor the
2367 * interface know about the command.
2368 */
2369 printk("on issue queue ");
2370
2371 res = res_success;
2372 } else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) {
2373 /*
2374 * The command was on the disconnected queue. We must
2375 * reconnect with the device if possible, and send it
2376 * an abort message.
2377 */
2378 printk("on disconnected queue ");
2379
2380 res = res_hw_abort;
2381 } else if (info->SCpnt == SCpnt) {
2382 printk("executing ");
2383
2384 switch (info->scsi.phase) {
2385 /*
2386 * If the interface is idle, and the command is 'disconnectable',
2387 * then it is the same as on the disconnected queue.
2388 */
2389 case PHASE_IDLE:
2390 if (info->scsi.disconnectable) {
2391 info->scsi.disconnectable = 0;
2392 info->SCpnt = NULL;
2393 res = res_hw_abort;
2394 }
2395 break;
2396
2397 default:
2398 break;
2399 }
2400 } else if (info->origSCpnt == SCpnt) {
2401 /*
2402 * The command will be executed next, but a command
2403 * is currently using the interface. This is similar to
2404 * being on the issue queue, except the busylun bit has
2405 * been set.
2406 */
2407 info->origSCpnt = NULL;
2408 clear_bit(SCpnt->device->id * 8 +
2409 (u8)(SCpnt->device->lun & 0x7), info->busyluns);
2410 printk("waiting for execution ");
2411 res = res_success;
2412 } else
2413 printk("unknown ");
2414
2415 return res;
2416}
2417
2418/**
2419 * fas216_eh_abort - abort this command
2420 * @SCpnt: command to abort
2421 *
2422 * Abort this command.
2423 * Returns: FAILED if unable to abort
2424 * Notes: io_request_lock is taken, and irqs are disabled
2425 */
2426int fas216_eh_abort(struct scsi_cmnd *SCpnt)
2427{
2428 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2429 int result = FAILED;
2430
2431 fas216_checkmagic(info);
2432
2433 info->stats.aborts += 1;
2434
2435 scmd_printk(KERN_WARNING, SCpnt, "abort command\n");
2436
2437 print_debug_list();
2438 fas216_dumpstate(info);
2439
2440 switch (fas216_find_command(info, SCpnt)) {
2441 /*
2442 * We found the command, and cleared it out. Either
2443 * the command is still known to be executing on the
2444 * target, or the busylun bit is not set.
2445 */
2446 case res_success:
2447 scmd_printk(KERN_WARNING, SCpnt, "abort %p success\n", SCpnt);
2448 result = SUCCESS;
2449 break;
2450
2451 /*
2452 * We need to reconnect to the target and send it an
2453 * ABORT or ABORT_TAG message. We can only do this
2454 * if the bus is free.
2455 */
2456 case res_hw_abort:
2457
2458 /*
2459 * We are unable to abort the command for some reason.
2460 */
2461 default:
2462 case res_failed:
2463 scmd_printk(KERN_WARNING, SCpnt, "abort %p failed\n", SCpnt);
2464 break;
2465 }
2466
2467 return result;
2468}
2469
2470/**
2471 * fas216_eh_device_reset - Reset the device associated with this command
2472 * @SCpnt: command specifing device to reset
2473 *
2474 * Reset the device associated with this command.
2475 * Returns: FAILED if unable to reset.
2476 * Notes: We won't be re-entered, so we'll only have one device
2477 * reset on the go at one time.
2478 */
2479int fas216_eh_device_reset(struct scsi_cmnd *SCpnt)
2480{
2481 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2482 unsigned long flags;
2483 int i, res = FAILED, target = SCpnt->device->id;
2484
2485 fas216_log(info, LOG_ERROR, "device reset for target %d", target);
2486
2487 spin_lock_irqsave(&info->host_lock, flags);
2488
2489 do {
2490 /*
2491 * If we are currently connected to a device, and
2492 * it is the device we want to reset, there is
2493 * nothing we can do here. Chances are it is stuck,
2494 * and we need a bus reset.
2495 */
2496 if (info->SCpnt && !info->scsi.disconnectable &&
2497 info->SCpnt->device->id == SCpnt->device->id)
2498 break;
2499
2500 /*
2501 * We're going to be resetting this device. Remove
2502 * all pending commands from the driver. By doing
2503 * so, we guarantee that we won't touch the command
2504 * structures except to process the reset request.
2505 */
2506 queue_remove_all_target(&info->queues.issue, target);
2507 queue_remove_all_target(&info->queues.disconnected, target);
2508 if (info->origSCpnt && info->origSCpnt->device->id == target)
2509 info->origSCpnt = NULL;
2510 if (info->reqSCpnt && info->reqSCpnt->device->id == target)
2511 info->reqSCpnt = NULL;
2512 for (i = 0; i < 8; i++)
2513 clear_bit(target * 8 + i, info->busyluns);
2514
2515 /*
2516 * Hijack this SCSI command structure to send
2517 * a bus device reset message to this device.
2518 */
2519 SCpnt->host_scribble = (void *)fas216_devicereset_done;
2520
2521 info->rst_dev_status = 0;
2522 info->rstSCpnt = SCpnt;
2523
2524 if (info->scsi.phase == PHASE_IDLE)
2525 fas216_kick(info);
2526
2527 mod_timer(&info->eh_timer, jiffies + 30 * HZ);
2528 spin_unlock_irqrestore(&info->host_lock, flags);
2529
2530 /*
2531 * Wait up to 30 seconds for the reset to complete.
2532 */
2533 wait_event(info->eh_wait, info->rst_dev_status);
2534
2535 del_timer_sync(&info->eh_timer);
2536 spin_lock_irqsave(&info->host_lock, flags);
2537 info->rstSCpnt = NULL;
2538
2539 if (info->rst_dev_status == 1)
2540 res = SUCCESS;
2541 } while (0);
2542
2543 SCpnt->host_scribble = NULL;
2544 spin_unlock_irqrestore(&info->host_lock, flags);
2545
2546 fas216_log(info, LOG_ERROR, "device reset complete: %s\n",
2547 res == SUCCESS ? "success" : "failed");
2548
2549 return res;
2550}
2551
2552/**
2553 * fas216_eh_bus_reset - Reset the bus associated with the command
2554 * @SCpnt: command specifing bus to reset
2555 *
2556 * Reset the bus associated with the command.
2557 * Returns: FAILED if unable to reset.
2558 * Notes: Further commands are blocked.
2559 */
2560int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt)
2561{
2562 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2563 unsigned long flags;
2564 struct scsi_device *SDpnt;
2565
2566 fas216_checkmagic(info);
2567 fas216_log(info, LOG_ERROR, "resetting bus");
2568
2569 info->stats.bus_resets += 1;
2570
2571 spin_lock_irqsave(&info->host_lock, flags);
2572
2573 /*
2574 * Stop all activity on this interface.
2575 */
2576 fas216_aborttransfer(info);
2577 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2578
2579 /*
2580 * Clear any pending interrupts.
2581 */
2582 while (fas216_readb(info, REG_STAT) & STAT_INT)
2583 fas216_readb(info, REG_INST);
2584
2585 info->rst_bus_status = 0;
2586
2587 /*
2588 * For each attached hard-reset device, clear out
2589 * all command structures. Leave the running
2590 * command in place.
2591 */
2592 shost_for_each_device(SDpnt, info->host) {
2593 int i;
2594
2595 if (SDpnt->soft_reset)
2596 continue;
2597
2598 queue_remove_all_target(&info->queues.issue, SDpnt->id);
2599 queue_remove_all_target(&info->queues.disconnected, SDpnt->id);
2600 if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id)
2601 info->origSCpnt = NULL;
2602 if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id)
2603 info->reqSCpnt = NULL;
2604 info->SCpnt = NULL;
2605
2606 for (i = 0; i < 8; i++)
2607 clear_bit(SDpnt->id * 8 + i, info->busyluns);
2608 }
2609
2610 info->scsi.phase = PHASE_IDLE;
2611
2612 /*
2613 * Reset the SCSI bus. Device cleanup happens in
2614 * the interrupt handler.
2615 */
2616 fas216_cmd(info, CMD_RESETSCSI);
2617
2618 mod_timer(&info->eh_timer, jiffies + HZ);
2619 spin_unlock_irqrestore(&info->host_lock, flags);
2620
2621 /*
2622 * Wait one second for the interrupt.
2623 */
2624 wait_event(info->eh_wait, info->rst_bus_status);
2625 del_timer_sync(&info->eh_timer);
2626
2627 fas216_log(info, LOG_ERROR, "bus reset complete: %s\n",
2628 info->rst_bus_status == 1 ? "success" : "failed");
2629
2630 return info->rst_bus_status == 1 ? SUCCESS : FAILED;
2631}
2632
2633/**
2634 * fas216_init_chip - Initialise FAS216 state after reset
2635 * @info: state structure for interface
2636 *
2637 * Initialise FAS216 state after reset
2638 */
2639static void fas216_init_chip(FAS216_Info *info)
2640{
2641 unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7;
2642 fas216_writeb(info, REG_CLKF, clock);
2643 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2644 fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]);
2645 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2646 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
2647 fas216_writeb(info, REG_SOF, 0);
2648 fas216_writeb(info, REG_STP, info->scsi.async_stp);
2649 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2650}
2651
2652/**
2653 * fas216_eh_host_reset - Reset the host associated with this command
2654 * @SCpnt: command specifing host to reset
2655 *
2656 * Reset the host associated with this command.
2657 * Returns: FAILED if unable to reset.
2658 * Notes: io_request_lock is taken, and irqs are disabled
2659 */
2660int fas216_eh_host_reset(struct scsi_cmnd *SCpnt)
2661{
2662 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2663
2664 spin_lock_irq(info->host->host_lock);
2665
2666 fas216_checkmagic(info);
2667
2668 fas216_log(info, LOG_ERROR, "resetting host");
2669
2670 /*
2671 * Reset the SCSI chip.
2672 */
2673 fas216_cmd(info, CMD_RESETCHIP);
2674
2675 /*
2676 * Ugly ugly ugly!
2677 * We need to release the host_lock and enable
2678 * IRQs if we sleep, but we must relock and disable
2679 * IRQs after the sleep.
2680 */
2681 spin_unlock_irq(info->host->host_lock);
2682 msleep(50 * 1000/100);
2683 spin_lock_irq(info->host->host_lock);
2684
2685 /*
2686 * Release the SCSI reset.
2687 */
2688 fas216_cmd(info, CMD_NOP);
2689
2690 fas216_init_chip(info);
2691
2692 spin_unlock_irq(info->host->host_lock);
2693 return SUCCESS;
2694}
2695
2696#define TYPE_UNKNOWN 0
2697#define TYPE_NCR53C90 1
2698#define TYPE_NCR53C90A 2
2699#define TYPE_NCR53C9x 3
2700#define TYPE_Am53CF94 4
2701#define TYPE_EmFAS216 5
2702#define TYPE_QLFAS216 6
2703
2704static char *chip_types[] = {
2705 "unknown",
2706 "NS NCR53C90",
2707 "NS NCR53C90A",
2708 "NS NCR53C9x",
2709 "AMD Am53CF94",
2710 "Emulex FAS216",
2711 "QLogic FAS216"
2712};
2713
2714static int fas216_detect_type(FAS216_Info *info)
2715{
2716 int family, rev;
2717
2718 /*
2719 * Reset the chip.
2720 */
2721 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2722 udelay(50);
2723 fas216_writeb(info, REG_CMD, CMD_NOP);
2724
2725 /*
2726 * Check to see if control reg 2 is present.
2727 */
2728 fas216_writeb(info, REG_CNTL3, 0);
2729 fas216_writeb(info, REG_CNTL2, CNTL2_S2FE);
2730
2731 /*
2732 * If we are unable to read back control reg 2
2733 * correctly, it is not present, and we have a
2734 * NCR53C90.
2735 */
2736 if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE)
2737 return TYPE_NCR53C90;
2738
2739 /*
2740 * Now, check control register 3
2741 */
2742 fas216_writeb(info, REG_CNTL2, 0);
2743 fas216_writeb(info, REG_CNTL3, 0);
2744 fas216_writeb(info, REG_CNTL3, 5);
2745
2746 /*
2747 * If we are unable to read the register back
2748 * correctly, we have a NCR53C90A
2749 */
2750 if (fas216_readb(info, REG_CNTL3) != 5)
2751 return TYPE_NCR53C90A;
2752
2753 /*
2754 * Now read the ID from the chip.
2755 */
2756 fas216_writeb(info, REG_CNTL3, 0);
2757
2758 fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK);
2759 fas216_writeb(info, REG_CNTL3, 0);
2760
2761 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2762 udelay(50);
2763 fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP);
2764
2765 fas216_writeb(info, REG_CNTL2, CNTL2_ENF);
2766 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2767 udelay(50);
2768 fas216_writeb(info, REG_CMD, CMD_NOP);
2769
2770 rev = fas216_readb(info, REG_ID);
2771 family = rev >> 3;
2772 rev &= 7;
2773
2774 switch (family) {
2775 case 0x01:
2776 if (rev == 4)
2777 return TYPE_Am53CF94;
2778 break;
2779
2780 case 0x02:
2781 switch (rev) {
2782 case 2:
2783 return TYPE_EmFAS216;
2784 case 3:
2785 return TYPE_QLFAS216;
2786 }
2787 break;
2788
2789 default:
2790 break;
2791 }
2792 printk("family %x rev %x\n", family, rev);
2793 return TYPE_NCR53C9x;
2794}
2795
2796/**
2797 * fas216_reset_state - Initialise driver internal state
2798 * @info: state to initialise
2799 *
2800 * Initialise driver internal state
2801 */
2802static void fas216_reset_state(FAS216_Info *info)
2803{
2804 int i;
2805
2806 fas216_checkmagic(info);
2807
2808 fas216_bus_reset(info);
2809
2810 /*
2811 * Clear out all stale info in our state structure
2812 */
2813 memset(info->busyluns, 0, sizeof(info->busyluns));
2814 info->scsi.disconnectable = 0;
2815 info->scsi.aborting = 0;
2816
2817 for (i = 0; i < 8; i++) {
2818 info->device[i].parity_enabled = 0;
2819 info->device[i].parity_check = 1;
2820 }
2821
2822 /*
2823 * Drain all commands on disconnected queue
2824 */
2825 while (queue_remove(&info->queues.disconnected) != NULL);
2826
2827 /*
2828 * Remove executing commands.
2829 */
2830 info->SCpnt = NULL;
2831 info->reqSCpnt = NULL;
2832 info->rstSCpnt = NULL;
2833 info->origSCpnt = NULL;
2834}
2835
2836/**
2837 * fas216_init - initialise FAS/NCR/AMD SCSI structures.
2838 * @host: a driver-specific filled-out structure
2839 *
2840 * Initialise FAS/NCR/AMD SCSI structures.
2841 * Returns: 0 on success
2842 */
2843int fas216_init(struct Scsi_Host *host)
2844{
2845 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2846
2847 info->magic_start = MAGIC;
2848 info->magic_end = MAGIC;
2849 info->host = host;
2850 info->scsi.cfg[0] = host->this_id | CNTL1_PERE;
2851 info->scsi.cfg[1] = CNTL2_ENF | CNTL2_S2FE;
2852 info->scsi.cfg[2] = info->ifcfg.cntl3 |
2853 CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM;
2854 info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod);
2855
2856 info->rst_dev_status = -1;
2857 info->rst_bus_status = -1;
2858 init_waitqueue_head(&info->eh_wait);
2859 timer_setup(&info->eh_timer, fas216_eh_timer, 0);
2860
2861 spin_lock_init(&info->host_lock);
2862
2863 memset(&info->stats, 0, sizeof(info->stats));
2864
2865 msgqueue_initialise(&info->scsi.msgs);
2866
2867 if (!queue_initialise(&info->queues.issue))
2868 return -ENOMEM;
2869
2870 if (!queue_initialise(&info->queues.disconnected)) {
2871 queue_free(&info->queues.issue);
2872 return -ENOMEM;
2873 }
2874
2875 return 0;
2876}
2877
2878/**
2879 * fas216_add - initialise FAS/NCR/AMD SCSI ic.
2880 * @host: a driver-specific filled-out structure
2881 * @dev: parent device
2882 *
2883 * Initialise FAS/NCR/AMD SCSI ic.
2884 * Returns: 0 on success
2885 */
2886int fas216_add(struct Scsi_Host *host, struct device *dev)
2887{
2888 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2889 int type, ret;
2890
2891 if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) {
2892 printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n",
2893 info->ifcfg.clockrate);
2894 return -EINVAL;
2895 }
2896
2897 fas216_reset_state(info);
2898 type = fas216_detect_type(info);
2899 info->scsi.type = chip_types[type];
2900
2901 udelay(300);
2902
2903 /*
2904 * Initialise the chip correctly.
2905 */
2906 fas216_init_chip(info);
2907
2908 /*
2909 * Reset the SCSI bus. We don't want to see
2910 * the resulting reset interrupt, so mask it
2911 * out.
2912 */
2913 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR);
2914 fas216_writeb(info, REG_CMD, CMD_RESETSCSI);
2915
2916 /*
2917 * scsi standard says wait 250ms
2918 */
2919 spin_unlock_irq(info->host->host_lock);
2920 msleep(100*1000/100);
2921 spin_lock_irq(info->host->host_lock);
2922
2923 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2924 fas216_readb(info, REG_INST);
2925
2926 fas216_checkmagic(info);
2927
2928 ret = scsi_add_host(host, dev);
2929 if (ret)
2930 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2931 else
2932 scsi_scan_host(host);
2933
2934 return ret;
2935}
2936
2937void fas216_remove(struct Scsi_Host *host)
2938{
2939 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2940
2941 fas216_checkmagic(info);
2942 scsi_remove_host(host);
2943
2944 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2945 scsi_host_put(host);
2946}
2947
2948/**
2949 * fas216_release - release all resources for FAS/NCR/AMD SCSI ic.
2950 * @host: a driver-specific filled-out structure
2951 *
2952 * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic.
2953 */
2954void fas216_release(struct Scsi_Host *host)
2955{
2956 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2957
2958 queue_free(&info->queues.disconnected);
2959 queue_free(&info->queues.issue);
2960}
2961
2962void fas216_print_host(FAS216_Info *info, struct seq_file *m)
2963{
2964 seq_printf(m,
2965 "\n"
2966 "Chip : %s\n"
2967 " Address: 0x%p\n"
2968 " IRQ : %d\n"
2969 " DMA : %d\n",
2970 info->scsi.type, info->scsi.io_base,
2971 info->scsi.irq, info->scsi.dma);
2972}
2973
2974void fas216_print_stats(FAS216_Info *info, struct seq_file *m)
2975{
2976 seq_printf(m, "\n"
2977 "Command Statistics:\n"
2978 " Queued : %u\n"
2979 " Issued : %u\n"
2980 " Completed : %u\n"
2981 " Reads : %u\n"
2982 " Writes : %u\n"
2983 " Others : %u\n"
2984 " Disconnects: %u\n"
2985 " Aborts : %u\n"
2986 " Bus resets : %u\n"
2987 " Host resets: %u\n",
2988 info->stats.queues, info->stats.removes,
2989 info->stats.fins, info->stats.reads,
2990 info->stats.writes, info->stats.miscs,
2991 info->stats.disconnects, info->stats.aborts,
2992 info->stats.bus_resets, info->stats.host_resets);
2993}
2994
2995void fas216_print_devices(FAS216_Info *info, struct seq_file *m)
2996{
2997 struct fas216_device *dev;
2998 struct scsi_device *scd;
2999
3000 seq_puts(m, "Device/Lun TaggedQ Parity Sync\n");
3001
3002 shost_for_each_device(scd, info->host) {
3003 dev = &info->device[scd->id];
3004 seq_printf(m, " %d/%llu ", scd->id, scd->lun);
3005 if (scd->tagged_supported)
3006 seq_printf(m, "%3sabled ",
3007 scd->simple_tags ? "en" : "dis");
3008 else
3009 seq_puts(m, "unsupported ");
3010
3011 seq_printf(m, "%3sabled ", dev->parity_enabled ? "en" : "dis");
3012
3013 if (dev->sof)
3014 seq_printf(m, "offset %d, %d ns\n",
3015 dev->sof, dev->period * 4);
3016 else
3017 seq_puts(m, "async\n");
3018 }
3019}
3020
3021EXPORT_SYMBOL(fas216_init);
3022EXPORT_SYMBOL(fas216_add);
3023EXPORT_SYMBOL(fas216_queue_command);
3024EXPORT_SYMBOL(fas216_noqueue_command);
3025EXPORT_SYMBOL(fas216_intr);
3026EXPORT_SYMBOL(fas216_remove);
3027EXPORT_SYMBOL(fas216_release);
3028EXPORT_SYMBOL(fas216_eh_abort);
3029EXPORT_SYMBOL(fas216_eh_device_reset);
3030EXPORT_SYMBOL(fas216_eh_bus_reset);
3031EXPORT_SYMBOL(fas216_eh_host_reset);
3032EXPORT_SYMBOL(fas216_print_host);
3033EXPORT_SYMBOL(fas216_print_stats);
3034EXPORT_SYMBOL(fas216_print_devices);
3035
3036MODULE_AUTHOR("Russell King");
3037MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core");
3038MODULE_LICENSE("GPL");