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.h"
51 #include <scsi/scsi_dbg.h>
52 #include <scsi/scsi_host.h>
53 #include "fas216.h"
54 #include "scsi.h"
55
56 /* NOTE: SCSI2 Synchronous transfers *require* DMA according to
57 * the data sheet. This restriction is crazy, especially when
58 * you only want to send 16 bytes! What were the guys who
59 * designed this chip on at that time? Did they read the SCSI2
60 * spec at all? The following sections are taken from the SCSI2
61 * standard (s2r10) concerning this:
62 *
63 * > IMPLEMENTORS NOTES:
64 * > (1) Re-negotiation at every selection is not recommended, since a
65 * > significant performance impact is likely.
66 *
67 * > The implied synchronous agreement shall remain in effect until a BUS DEVICE
68 * > RESET message is received, until a hard reset condition occurs, or until one
69 * > of the two SCSI devices elects to modify the agreement. The default data
70 * > transfer mode is asynchronous data transfer mode. The default data transfer
71 * > mode is entered at power on, after a BUS DEVICE RESET message, or after a hard
72 * > reset condition.
73 *
74 * In total, this means that once you have elected to use synchronous
75 * transfers, you must always use DMA.
76 *
77 * I was thinking that this was a good chip until I found this restriction ;(
78 */
79 #define SCSI2_SYNC
80 #undef SCSI2_TAG
81
82 #undef DEBUG_CONNECT
83 #undef DEBUG_MESSAGES
84
85 #undef CHECK_STRUCTURE
86
87 #define LOG_CONNECT (1 << 0)
88 #define LOG_BUSSERVICE (1 << 1)
89 #define LOG_FUNCTIONDONE (1 << 2)
90 #define LOG_MESSAGES (1 << 3)
91 #define LOG_BUFFER (1 << 4)
92 #define LOG_ERROR (1 << 8)
93
94 static int level_mask = LOG_ERROR;
95
96 module_param(level_mask, int, 0644);
97
98 #ifndef MODULE
fas216_log_setup(char * str)99 static int __init fas216_log_setup(char *str)
100 {
101 char *s;
102
103 level_mask = 0;
104
105 while ((s = strsep(&str, ",")) != NULL) {
106 switch (s[0]) {
107 case 'a':
108 if (strcmp(s, "all") == 0)
109 level_mask |= -1;
110 break;
111 case 'b':
112 if (strncmp(s, "bus", 3) == 0)
113 level_mask |= LOG_BUSSERVICE;
114 if (strncmp(s, "buf", 3) == 0)
115 level_mask |= LOG_BUFFER;
116 break;
117 case 'c':
118 level_mask |= LOG_CONNECT;
119 break;
120 case 'e':
121 level_mask |= LOG_ERROR;
122 break;
123 case 'm':
124 level_mask |= LOG_MESSAGES;
125 break;
126 case 'n':
127 if (strcmp(s, "none") == 0)
128 level_mask = 0;
129 break;
130 case 's':
131 level_mask |= LOG_FUNCTIONDONE;
132 break;
133 }
134 }
135 return 1;
136 }
137
138 __setup("fas216_logging=", fas216_log_setup);
139 #endif
140
fas216_readb(FAS216_Info * info,unsigned int reg)141 static inline unsigned char fas216_readb(FAS216_Info *info, unsigned int reg)
142 {
143 unsigned int off = reg << info->scsi.io_shift;
144 return readb(info->scsi.io_base + off);
145 }
146
fas216_writeb(FAS216_Info * info,unsigned int reg,unsigned int val)147 static inline void fas216_writeb(FAS216_Info *info, unsigned int reg, unsigned int val)
148 {
149 unsigned int off = reg << info->scsi.io_shift;
150 writeb(val, info->scsi.io_base + off);
151 }
152
fas216_dumpstate(FAS216_Info * info)153 static void fas216_dumpstate(FAS216_Info *info)
154 {
155 unsigned char is, stat, inst;
156
157 is = fas216_readb(info, REG_IS);
158 stat = fas216_readb(info, REG_STAT);
159 inst = fas216_readb(info, REG_INST);
160
161 printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X"
162 " INST=%02X IS=%02X CFIS=%02X",
163 fas216_readb(info, REG_CTCL),
164 fas216_readb(info, REG_CTCM),
165 fas216_readb(info, REG_CMD), stat, inst, is,
166 fas216_readb(info, REG_CFIS));
167 printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n",
168 fas216_readb(info, REG_CNTL1),
169 fas216_readb(info, REG_CNTL2),
170 fas216_readb(info, REG_CNTL3),
171 fas216_readb(info, REG_CTCH));
172 }
173
print_SCp(struct scsi_pointer * SCp,const char * prefix,const char * suffix)174 static void print_SCp(struct scsi_pointer *SCp, const char *prefix, const char *suffix)
175 {
176 printk("%sptr %p this_residual 0x%x buffer %p buffers_residual 0x%x%s",
177 prefix, SCp->ptr, SCp->this_residual, SCp->buffer,
178 SCp->buffers_residual, suffix);
179 }
180
181 #ifdef CHECK_STRUCTURE
fas216_dumpinfo(FAS216_Info * info)182 static void fas216_dumpinfo(FAS216_Info *info)
183 {
184 static int used = 0;
185 int i;
186
187 if (used++)
188 return;
189
190 printk("FAS216_Info=\n");
191 printk(" { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p\n",
192 info->magic_start, info->host, info->SCpnt,
193 info->origSCpnt);
194 printk(" scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }\n",
195 info->scsi.io_shift, info->scsi.irq,
196 info->scsi.cfg[0], info->scsi.cfg[1], info->scsi.cfg[2],
197 info->scsi.cfg[3]);
198 printk(" type=%p phase=%X\n",
199 info->scsi.type, info->scsi.phase);
200 print_SCp(&info->scsi.SCp, " SCp={ ", " }\n");
201 printk(" msgs async_stp=%X disconnectable=%d aborting=%d }\n",
202 info->scsi.async_stp,
203 info->scsi.disconnectable, info->scsi.aborting);
204 printk(" stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X\n"
205 " disconnects=%X aborts=%X bus_resets=%X host_resets=%X}\n",
206 info->stats.queues, info->stats.removes, info->stats.fins,
207 info->stats.reads, info->stats.writes, info->stats.miscs,
208 info->stats.disconnects, info->stats.aborts, info->stats.bus_resets,
209 info->stats.host_resets);
210 printk(" ifcfg={ clockrate=%X select_timeout=%X asyncperiod=%X sync_max_depth=%X }\n",
211 info->ifcfg.clockrate, info->ifcfg.select_timeout,
212 info->ifcfg.asyncperiod, info->ifcfg.sync_max_depth);
213 for (i = 0; i < 8; i++) {
214 printk(" busyluns[%d]=%08lx dev[%d]={ disconnect_ok=%d stp=%X sof=%X sync_state=%X }\n",
215 i, info->busyluns[i], i,
216 info->device[i].disconnect_ok, info->device[i].stp,
217 info->device[i].sof, info->device[i].sync_state);
218 }
219 printk(" dma={ transfer_type=%X setup=%p pseudo=%p stop=%p }\n",
220 info->dma.transfer_type, info->dma.setup,
221 info->dma.pseudo, info->dma.stop);
222 printk(" internal_done=%X magic_end=%lX }\n",
223 info->internal_done, info->magic_end);
224 }
225
__fas216_checkmagic(FAS216_Info * info,const char * func)226 static void __fas216_checkmagic(FAS216_Info *info, const char *func)
227 {
228 int corruption = 0;
229 if (info->magic_start != MAGIC) {
230 printk(KERN_CRIT "FAS216 Error: magic at start corrupted\n");
231 corruption++;
232 }
233 if (info->magic_end != MAGIC) {
234 printk(KERN_CRIT "FAS216 Error: magic at end corrupted\n");
235 corruption++;
236 }
237 if (corruption) {
238 fas216_dumpinfo(info);
239 panic("scsi memory space corrupted in %s", func);
240 }
241 }
242 #define fas216_checkmagic(info) __fas216_checkmagic((info), __func__)
243 #else
244 #define fas216_checkmagic(info)
245 #endif
246
fas216_bus_phase(int stat)247 static const char *fas216_bus_phase(int stat)
248 {
249 static const char *phases[] = {
250 "DATA OUT", "DATA IN",
251 "COMMAND", "STATUS",
252 "MISC OUT", "MISC IN",
253 "MESG OUT", "MESG IN"
254 };
255
256 return phases[stat & STAT_BUSMASK];
257 }
258
fas216_drv_phase(FAS216_Info * info)259 static const char *fas216_drv_phase(FAS216_Info *info)
260 {
261 static const char *phases[] = {
262 [PHASE_IDLE] = "idle",
263 [PHASE_SELECTION] = "selection",
264 [PHASE_COMMAND] = "command",
265 [PHASE_DATAOUT] = "data out",
266 [PHASE_DATAIN] = "data in",
267 [PHASE_MSGIN] = "message in",
268 [PHASE_MSGIN_DISCONNECT]= "disconnect",
269 [PHASE_MSGOUT_EXPECT] = "expect message out",
270 [PHASE_MSGOUT] = "message out",
271 [PHASE_STATUS] = "status",
272 [PHASE_DONE] = "done",
273 };
274
275 if (info->scsi.phase < ARRAY_SIZE(phases) &&
276 phases[info->scsi.phase])
277 return phases[info->scsi.phase];
278 return "???";
279 }
280
fas216_target(FAS216_Info * info)281 static char fas216_target(FAS216_Info *info)
282 {
283 if (info->SCpnt)
284 return '0' + info->SCpnt->device->id;
285 else
286 return 'H';
287 }
288
289 static void
fas216_do_log(FAS216_Info * info,char target,char * fmt,va_list ap)290 fas216_do_log(FAS216_Info *info, char target, char *fmt, va_list ap)
291 {
292 static char buf[1024];
293
294 vsnprintf(buf, sizeof(buf), fmt, ap);
295 printk("scsi%d.%c: %s", info->host->host_no, target, buf);
296 }
297
fas216_log_command(FAS216_Info * info,int level,struct scsi_cmnd * SCpnt,char * fmt,...)298 static void fas216_log_command(FAS216_Info *info, int level,
299 struct scsi_cmnd *SCpnt, char *fmt, ...)
300 {
301 va_list args;
302
303 if (level != 0 && !(level & level_mask))
304 return;
305
306 va_start(args, fmt);
307 fas216_do_log(info, '0' + SCpnt->device->id, fmt, args);
308 va_end(args);
309
310 scsi_print_command(SCpnt);
311 }
312
313 static void
fas216_log_target(FAS216_Info * info,int level,int target,char * fmt,...)314 fas216_log_target(FAS216_Info *info, int level, int target, char *fmt, ...)
315 {
316 va_list args;
317
318 if (level != 0 && !(level & level_mask))
319 return;
320
321 if (target < 0)
322 target = 'H';
323 else
324 target += '0';
325
326 va_start(args, fmt);
327 fas216_do_log(info, target, fmt, args);
328 va_end(args);
329
330 printk("\n");
331 }
332
fas216_log(FAS216_Info * info,int level,char * fmt,...)333 static void fas216_log(FAS216_Info *info, int level, char *fmt, ...)
334 {
335 va_list args;
336
337 if (level != 0 && !(level & level_mask))
338 return;
339
340 va_start(args, fmt);
341 fas216_do_log(info, fas216_target(info), fmt, args);
342 va_end(args);
343
344 printk("\n");
345 }
346
347 #define PH_SIZE 32
348
349 static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE];
350 static int ph_ptr;
351
add_debug_list(int stat,int ssr,int isr,int ph)352 static void add_debug_list(int stat, int ssr, int isr, int ph)
353 {
354 ph_list[ph_ptr].stat = stat;
355 ph_list[ph_ptr].ssr = ssr;
356 ph_list[ph_ptr].isr = isr;
357 ph_list[ph_ptr].ph = ph;
358
359 ph_ptr = (ph_ptr + 1) & (PH_SIZE-1);
360 }
361
362 static struct { int command; void *from; } cmd_list[8];
363 static int cmd_ptr;
364
fas216_cmd(FAS216_Info * info,unsigned int command)365 static void fas216_cmd(FAS216_Info *info, unsigned int command)
366 {
367 cmd_list[cmd_ptr].command = command;
368 cmd_list[cmd_ptr].from = __builtin_return_address(0);
369
370 cmd_ptr = (cmd_ptr + 1) & 7;
371
372 fas216_writeb(info, REG_CMD, command);
373 }
374
print_debug_list(void)375 static void print_debug_list(void)
376 {
377 int i;
378
379 i = ph_ptr;
380
381 printk(KERN_ERR "SCSI IRQ trail\n");
382 do {
383 printk(" %02x:%02x:%02x:%1x",
384 ph_list[i].stat, ph_list[i].ssr,
385 ph_list[i].isr, ph_list[i].ph);
386 i = (i + 1) & (PH_SIZE - 1);
387 if (((i ^ ph_ptr) & 7) == 0)
388 printk("\n");
389 } while (i != ph_ptr);
390 if ((i ^ ph_ptr) & 7)
391 printk("\n");
392
393 i = cmd_ptr;
394 printk(KERN_ERR "FAS216 commands: ");
395 do {
396 printk("%02x:%p ", cmd_list[i].command, cmd_list[i].from);
397 i = (i + 1) & 7;
398 } while (i != cmd_ptr);
399 printk("\n");
400 }
401
402 static void fas216_done(FAS216_Info *info, unsigned int result);
403
404 /**
405 * fas216_get_last_msg - retrive last message from the list
406 * @info: interface to search
407 * @pos: current fifo position
408 *
409 * Retrieve a last message from the list, using position in fifo.
410 */
411 static inline unsigned short
fas216_get_last_msg(FAS216_Info * info,int pos)412 fas216_get_last_msg(FAS216_Info *info, int pos)
413 {
414 unsigned short packed_msg = NOP;
415 struct message *msg;
416 int msgnr = 0;
417
418 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
419 if (pos >= msg->fifo)
420 break;
421 }
422
423 if (msg) {
424 if (msg->msg[0] == EXTENDED_MESSAGE)
425 packed_msg = EXTENDED_MESSAGE | msg->msg[2] << 8;
426 else
427 packed_msg = msg->msg[0];
428 }
429
430 fas216_log(info, LOG_MESSAGES,
431 "Message: %04x found at position %02x\n", packed_msg, pos);
432
433 return packed_msg;
434 }
435
436 /**
437 * fas216_syncperiod - calculate STP register value
438 * @info: state structure for interface connected to device
439 * @ns: period in ns (between subsequent bytes)
440 *
441 * Calculate value to be loaded into the STP register for a given period
442 * in ns. Returns a value suitable for REG_STP.
443 */
fas216_syncperiod(FAS216_Info * info,int ns)444 static int fas216_syncperiod(FAS216_Info *info, int ns)
445 {
446 int value = (info->ifcfg.clockrate * ns) / 1000;
447
448 fas216_checkmagic(info);
449
450 if (value < 4)
451 value = 4;
452 else if (value > 35)
453 value = 35;
454
455 return value & 31;
456 }
457
458 /**
459 * fas216_set_sync - setup FAS216 chip for specified transfer period.
460 * @info: state structure for interface connected to device
461 * @target: target
462 *
463 * Correctly setup FAS216 chip for specified transfer period.
464 * Notes : we need to switch the chip out of FASTSCSI mode if we have
465 * a transfer period >= 200ns - otherwise the chip will violate
466 * the SCSI timings.
467 */
fas216_set_sync(FAS216_Info * info,int target)468 static void fas216_set_sync(FAS216_Info *info, int target)
469 {
470 unsigned int cntl3;
471
472 fas216_writeb(info, REG_SOF, info->device[target].sof);
473 fas216_writeb(info, REG_STP, info->device[target].stp);
474
475 cntl3 = info->scsi.cfg[2];
476 if (info->device[target].period >= (200 / 4))
477 cntl3 = cntl3 & ~CNTL3_FASTSCSI;
478
479 fas216_writeb(info, REG_CNTL3, cntl3);
480 }
481
482 /* Synchronous transfer support
483 *
484 * Note: The SCSI II r10 spec says (5.6.12):
485 *
486 * (2) Due to historical problems with early host adapters that could
487 * not accept an SDTR message, some targets may not initiate synchronous
488 * negotiation after a power cycle as required by this standard. Host
489 * adapters that support synchronous mode may avoid the ensuing failure
490 * modes when the target is independently power cycled by initiating a
491 * synchronous negotiation on each REQUEST SENSE and INQUIRY command.
492 * This approach increases the SCSI bus overhead and is not recommended
493 * for new implementations. The correct method is to respond to an
494 * SDTR message with a MESSAGE REJECT message if the either the
495 * initiator or target devices does not support synchronous transfers
496 * or does not want to negotiate for synchronous transfers at the time.
497 * Using the correct method assures compatibility with wide data
498 * transfers and future enhancements.
499 *
500 * We will always initiate a synchronous transfer negotiation request on
501 * every INQUIRY or REQUEST SENSE message, unless the target itself has
502 * at some point performed a synchronous transfer negotiation request, or
503 * we have synchronous transfers disabled for this device.
504 */
505
506 /**
507 * fas216_handlesync - Handle a synchronous transfer message
508 * @info: state structure for interface
509 * @msg: message from target
510 *
511 * Handle a synchronous transfer message from the target
512 */
fas216_handlesync(FAS216_Info * info,char * msg)513 static void fas216_handlesync(FAS216_Info *info, char *msg)
514 {
515 struct fas216_device *dev = &info->device[info->SCpnt->device->id];
516 enum { sync, async, none, reject } res = none;
517
518 #ifdef SCSI2_SYNC
519 switch (msg[0]) {
520 case MESSAGE_REJECT:
521 /* Synchronous transfer request failed.
522 * Note: SCSI II r10:
523 *
524 * SCSI devices that are capable of synchronous
525 * data transfers shall not respond to an SDTR
526 * message with a MESSAGE REJECT message.
527 *
528 * Hence, if we get this condition, we disable
529 * negotiation for this device.
530 */
531 if (dev->sync_state == neg_inprogress) {
532 dev->sync_state = neg_invalid;
533 res = async;
534 }
535 break;
536
537 case EXTENDED_MESSAGE:
538 switch (dev->sync_state) {
539 /* We don't accept synchronous transfer requests.
540 * Respond with a MESSAGE_REJECT to prevent a
541 * synchronous transfer agreement from being reached.
542 */
543 case neg_invalid:
544 res = reject;
545 break;
546
547 /* We were not negotiating a synchronous transfer,
548 * but the device sent us a negotiation request.
549 * Honour the request by sending back a SDTR
550 * message containing our capability, limited by
551 * the targets capability.
552 */
553 default:
554 fas216_cmd(info, CMD_SETATN);
555 if (msg[4] > info->ifcfg.sync_max_depth)
556 msg[4] = info->ifcfg.sync_max_depth;
557 if (msg[3] < 1000 / info->ifcfg.clockrate)
558 msg[3] = 1000 / info->ifcfg.clockrate;
559
560 msgqueue_flush(&info->scsi.msgs);
561 msgqueue_addmsg(&info->scsi.msgs, 5,
562 EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
563 msg[3], msg[4]);
564 info->scsi.phase = PHASE_MSGOUT_EXPECT;
565
566 /* This is wrong. The agreement is not in effect
567 * until this message is accepted by the device
568 */
569 dev->sync_state = neg_targcomplete;
570 res = sync;
571 break;
572
573 /* We initiated the synchronous transfer negotiation,
574 * and have successfully received a response from the
575 * target. The synchronous transfer agreement has been
576 * reached. Note: if the values returned are out of our
577 * bounds, we must reject the message.
578 */
579 case neg_inprogress:
580 res = reject;
581 if (msg[4] <= info->ifcfg.sync_max_depth &&
582 msg[3] >= 1000 / info->ifcfg.clockrate) {
583 dev->sync_state = neg_complete;
584 res = sync;
585 }
586 break;
587 }
588 }
589 #else
590 res = reject;
591 #endif
592
593 switch (res) {
594 case sync:
595 dev->period = msg[3];
596 dev->sof = msg[4];
597 dev->stp = fas216_syncperiod(info, msg[3] * 4);
598 fas216_set_sync(info, info->SCpnt->device->id);
599 break;
600
601 case reject:
602 fas216_cmd(info, CMD_SETATN);
603 msgqueue_flush(&info->scsi.msgs);
604 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
605 info->scsi.phase = PHASE_MSGOUT_EXPECT;
606 fallthrough;
607
608 case async:
609 dev->period = info->ifcfg.asyncperiod / 4;
610 dev->sof = 0;
611 dev->stp = info->scsi.async_stp;
612 fas216_set_sync(info, info->SCpnt->device->id);
613 break;
614
615 case none:
616 break;
617 }
618 }
619
620 /**
621 * fas216_updateptrs - update data pointers after transfer suspended/paused
622 * @info: interface's local pointer to update
623 * @bytes_transferred: number of bytes transferred
624 *
625 * Update data pointers after transfer suspended/paused
626 */
fas216_updateptrs(FAS216_Info * info,int bytes_transferred)627 static void fas216_updateptrs(FAS216_Info *info, int bytes_transferred)
628 {
629 struct scsi_pointer *SCp = &info->scsi.SCp;
630
631 fas216_checkmagic(info);
632
633 BUG_ON(bytes_transferred < 0);
634
635 SCp->phase -= bytes_transferred;
636
637 while (bytes_transferred != 0) {
638 if (SCp->this_residual > bytes_transferred)
639 break;
640 /*
641 * We have used up this buffer. Move on to the
642 * next buffer.
643 */
644 bytes_transferred -= SCp->this_residual;
645 if (!next_SCp(SCp) && bytes_transferred) {
646 printk(KERN_WARNING "scsi%d.%c: out of buffers\n",
647 info->host->host_no, '0' + info->SCpnt->device->id);
648 return;
649 }
650 }
651
652 SCp->this_residual -= bytes_transferred;
653 if (SCp->this_residual)
654 SCp->ptr += bytes_transferred;
655 else
656 SCp->ptr = NULL;
657 }
658
659 /**
660 * fas216_pio - transfer data off of/on to card using programmed IO
661 * @info: interface to transfer data to/from
662 * @direction: direction to transfer data (DMA_OUT/DMA_IN)
663 *
664 * Transfer data off of/on to card using programmed IO.
665 * Notes: this is incredibly slow.
666 */
fas216_pio(FAS216_Info * info,fasdmadir_t direction)667 static void fas216_pio(FAS216_Info *info, fasdmadir_t direction)
668 {
669 struct scsi_pointer *SCp = &info->scsi.SCp;
670
671 fas216_checkmagic(info);
672
673 if (direction == DMA_OUT)
674 fas216_writeb(info, REG_FF, get_next_SCp_byte(SCp));
675 else
676 put_next_SCp_byte(SCp, fas216_readb(info, REG_FF));
677
678 if (SCp->this_residual == 0)
679 next_SCp(SCp);
680 }
681
fas216_set_stc(FAS216_Info * info,unsigned int length)682 static void fas216_set_stc(FAS216_Info *info, unsigned int length)
683 {
684 fas216_writeb(info, REG_STCL, length);
685 fas216_writeb(info, REG_STCM, length >> 8);
686 fas216_writeb(info, REG_STCH, length >> 16);
687 }
688
fas216_get_ctc(FAS216_Info * info)689 static unsigned int fas216_get_ctc(FAS216_Info *info)
690 {
691 return fas216_readb(info, REG_CTCL) +
692 (fas216_readb(info, REG_CTCM) << 8) +
693 (fas216_readb(info, REG_CTCH) << 16);
694 }
695
696 /**
697 * fas216_cleanuptransfer - clean up after a transfer has completed.
698 * @info: interface to clean up
699 *
700 * Update the data pointers according to the number of bytes transferred
701 * on the SCSI bus.
702 */
fas216_cleanuptransfer(FAS216_Info * info)703 static void fas216_cleanuptransfer(FAS216_Info *info)
704 {
705 unsigned long total, residual, fifo;
706 fasdmatype_t dmatype = info->dma.transfer_type;
707
708 info->dma.transfer_type = fasdma_none;
709
710 /*
711 * PIO transfers do not need to be cleaned up.
712 */
713 if (dmatype == fasdma_pio || dmatype == fasdma_none)
714 return;
715
716 if (dmatype == fasdma_real_all)
717 total = info->scsi.SCp.phase;
718 else
719 total = info->scsi.SCp.this_residual;
720
721 residual = fas216_get_ctc(info);
722
723 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
724
725 fas216_log(info, LOG_BUFFER, "cleaning up from previous "
726 "transfer: length 0x%06x, residual 0x%x, fifo %d",
727 total, residual, fifo);
728
729 /*
730 * If we were performing Data-Out, the transfer counter
731 * counts down each time a byte is transferred by the
732 * host to the FIFO. This means we must include the
733 * bytes left in the FIFO from the transfer counter.
734 */
735 if (info->scsi.phase == PHASE_DATAOUT)
736 residual += fifo;
737
738 fas216_updateptrs(info, total - residual);
739 }
740
741 /**
742 * fas216_transfer - Perform a DMA/PIO transfer off of/on to card
743 * @info: interface from which device disconnected from
744 *
745 * Start a DMA/PIO transfer off of/on to card
746 */
fas216_transfer(FAS216_Info * info)747 static void fas216_transfer(FAS216_Info *info)
748 {
749 fasdmadir_t direction;
750 fasdmatype_t dmatype;
751
752 fas216_log(info, LOG_BUFFER,
753 "starttransfer: buffer %p length 0x%06x reqlen 0x%06x",
754 info->scsi.SCp.ptr, info->scsi.SCp.this_residual,
755 info->scsi.SCp.phase);
756
757 if (!info->scsi.SCp.ptr) {
758 fas216_log(info, LOG_ERROR, "null buffer passed to "
759 "fas216_starttransfer");
760 print_SCp(&info->scsi.SCp, "SCp: ", "\n");
761 print_SCp(&info->SCpnt->SCp, "Cmnd SCp: ", "\n");
762 return;
763 }
764
765 /*
766 * If we have a synchronous transfer agreement in effect, we must
767 * use DMA mode. If we are using asynchronous transfers, we may
768 * use DMA mode or PIO mode.
769 */
770 if (info->device[info->SCpnt->device->id].sof)
771 dmatype = fasdma_real_all;
772 else
773 dmatype = fasdma_pio;
774
775 if (info->scsi.phase == PHASE_DATAOUT)
776 direction = DMA_OUT;
777 else
778 direction = DMA_IN;
779
780 if (info->dma.setup)
781 dmatype = info->dma.setup(info->host, &info->scsi.SCp,
782 direction, dmatype);
783 info->dma.transfer_type = dmatype;
784
785 if (dmatype == fasdma_real_all)
786 fas216_set_stc(info, info->scsi.SCp.phase);
787 else
788 fas216_set_stc(info, info->scsi.SCp.this_residual);
789
790 switch (dmatype) {
791 case fasdma_pio:
792 fas216_log(info, LOG_BUFFER, "PIO transfer");
793 fas216_writeb(info, REG_SOF, 0);
794 fas216_writeb(info, REG_STP, info->scsi.async_stp);
795 fas216_cmd(info, CMD_TRANSFERINFO);
796 fas216_pio(info, direction);
797 break;
798
799 case fasdma_pseudo:
800 fas216_log(info, LOG_BUFFER, "pseudo transfer");
801 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
802 info->dma.pseudo(info->host, &info->scsi.SCp,
803 direction, info->SCpnt->transfersize);
804 break;
805
806 case fasdma_real_block:
807 fas216_log(info, LOG_BUFFER, "block dma transfer");
808 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
809 break;
810
811 case fasdma_real_all:
812 fas216_log(info, LOG_BUFFER, "total dma transfer");
813 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
814 break;
815
816 default:
817 fas216_log(info, LOG_BUFFER | LOG_ERROR,
818 "invalid FAS216 DMA type");
819 break;
820 }
821 }
822
823 /**
824 * fas216_stoptransfer - Stop a DMA transfer onto / off of the card
825 * @info: interface from which device disconnected from
826 *
827 * Called when we switch away from DATA IN or DATA OUT phases.
828 */
fas216_stoptransfer(FAS216_Info * info)829 static void fas216_stoptransfer(FAS216_Info *info)
830 {
831 fas216_checkmagic(info);
832
833 if (info->dma.transfer_type == fasdma_real_all ||
834 info->dma.transfer_type == fasdma_real_block)
835 info->dma.stop(info->host, &info->scsi.SCp);
836
837 fas216_cleanuptransfer(info);
838
839 if (info->scsi.phase == PHASE_DATAIN) {
840 unsigned int fifo;
841
842 /*
843 * If we were performing Data-In, then the FIFO counter
844 * contains the number of bytes not transferred via DMA
845 * from the on-board FIFO. Read them manually.
846 */
847 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
848 while (fifo && info->scsi.SCp.ptr) {
849 *info->scsi.SCp.ptr = fas216_readb(info, REG_FF);
850 fas216_updateptrs(info, 1);
851 fifo--;
852 }
853 } else {
854 /*
855 * After a Data-Out phase, there may be unsent
856 * bytes left in the FIFO. Flush them out.
857 */
858 fas216_cmd(info, CMD_FLUSHFIFO);
859 }
860 }
861
fas216_aborttransfer(FAS216_Info * info)862 static void fas216_aborttransfer(FAS216_Info *info)
863 {
864 fas216_checkmagic(info);
865
866 if (info->dma.transfer_type == fasdma_real_all ||
867 info->dma.transfer_type == fasdma_real_block)
868 info->dma.stop(info->host, &info->scsi.SCp);
869
870 info->dma.transfer_type = fasdma_none;
871 fas216_cmd(info, CMD_FLUSHFIFO);
872 }
873
874 static void fas216_kick(FAS216_Info *info);
875
876 /**
877 * fas216_disconnected_intr - handle device disconnection
878 * @info: interface from which device disconnected from
879 *
880 * Handle device disconnection
881 */
fas216_disconnect_intr(FAS216_Info * info)882 static void fas216_disconnect_intr(FAS216_Info *info)
883 {
884 unsigned long flags;
885
886 fas216_checkmagic(info);
887
888 fas216_log(info, LOG_CONNECT, "disconnect phase=%02x",
889 info->scsi.phase);
890
891 msgqueue_flush(&info->scsi.msgs);
892
893 switch (info->scsi.phase) {
894 case PHASE_SELECTION: /* while selecting - no target */
895 case PHASE_SELSTEPS:
896 fas216_done(info, DID_NO_CONNECT);
897 break;
898
899 case PHASE_MSGIN_DISCONNECT: /* message in - disconnecting */
900 info->scsi.disconnectable = 1;
901 info->scsi.phase = PHASE_IDLE;
902 info->stats.disconnects += 1;
903 spin_lock_irqsave(&info->host_lock, flags);
904 if (info->scsi.phase == PHASE_IDLE)
905 fas216_kick(info);
906 spin_unlock_irqrestore(&info->host_lock, flags);
907 break;
908
909 case PHASE_DONE: /* at end of command - complete */
910 fas216_done(info, DID_OK);
911 break;
912
913 case PHASE_MSGOUT: /* message out - possible ABORT message */
914 if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) {
915 info->scsi.aborting = 0;
916 fas216_done(info, DID_ABORT);
917 break;
918 }
919 fallthrough;
920
921 default: /* huh? */
922 printk(KERN_ERR "scsi%d.%c: unexpected disconnect in phase %s\n",
923 info->host->host_no, fas216_target(info), fas216_drv_phase(info));
924 print_debug_list();
925 fas216_stoptransfer(info);
926 fas216_done(info, DID_ERROR);
927 break;
928 }
929 }
930
931 /**
932 * fas216_reselected_intr - start reconnection of a device
933 * @info: interface which was reselected
934 *
935 * Start reconnection of a device
936 */
937 static void
fas216_reselected_intr(FAS216_Info * info)938 fas216_reselected_intr(FAS216_Info *info)
939 {
940 unsigned int cfis, i;
941 unsigned char msg[4];
942 unsigned char target, lun, tag;
943
944 fas216_checkmagic(info);
945
946 WARN_ON(info->scsi.phase == PHASE_SELECTION ||
947 info->scsi.phase == PHASE_SELSTEPS);
948
949 cfis = fas216_readb(info, REG_CFIS);
950
951 fas216_log(info, LOG_CONNECT, "reconnect phase=%02x cfis=%02x",
952 info->scsi.phase, cfis);
953
954 cfis &= CFIS_CF;
955
956 if (cfis < 2 || cfis > 4) {
957 printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n",
958 info->host->host_no);
959 goto bad_message;
960 }
961
962 for (i = 0; i < cfis; i++)
963 msg[i] = fas216_readb(info, REG_FF);
964
965 if (!(msg[0] & (1 << info->host->this_id)) ||
966 !(msg[1] & 0x80))
967 goto initiator_error;
968
969 target = msg[0] & ~(1 << info->host->this_id);
970 target = ffs(target) - 1;
971 lun = msg[1] & 7;
972 tag = 0;
973
974 if (cfis >= 3) {
975 if (msg[2] != SIMPLE_QUEUE_TAG)
976 goto initiator_error;
977
978 tag = msg[3];
979 }
980
981 /* set up for synchronous transfers */
982 fas216_writeb(info, REG_SDID, target);
983 fas216_set_sync(info, target);
984 msgqueue_flush(&info->scsi.msgs);
985
986 fas216_log(info, LOG_CONNECT, "Reconnected: target %1x lun %1x tag %02x",
987 target, lun, tag);
988
989 if (info->scsi.disconnectable && info->SCpnt) {
990 info->scsi.disconnectable = 0;
991 if (info->SCpnt->device->id == target &&
992 info->SCpnt->device->lun == lun &&
993 info->SCpnt->tag == tag) {
994 fas216_log(info, LOG_CONNECT, "reconnected previously executing command");
995 } else {
996 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
997 fas216_log(info, LOG_CONNECT, "had to move command to disconnected queue");
998 info->SCpnt = NULL;
999 }
1000 }
1001 if (!info->SCpnt) {
1002 info->SCpnt = queue_remove_tgtluntag(&info->queues.disconnected,
1003 target, lun, tag);
1004 fas216_log(info, LOG_CONNECT, "had to get command");
1005 }
1006
1007 if (info->SCpnt) {
1008 /*
1009 * Restore data pointer from SAVED data pointer
1010 */
1011 info->scsi.SCp = info->SCpnt->SCp;
1012
1013 fas216_log(info, LOG_CONNECT, "data pointers: [%p, %X]",
1014 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1015 info->scsi.phase = PHASE_MSGIN;
1016 } else {
1017 /*
1018 * Our command structure not found - abort the
1019 * command on the target. Since we have no
1020 * record of this command, we can't send
1021 * an INITIATOR DETECTED ERROR message.
1022 */
1023 fas216_cmd(info, CMD_SETATN);
1024
1025 #if 0
1026 if (tag)
1027 msgqueue_addmsg(&info->scsi.msgs, 2, ABORT_TAG, tag);
1028 else
1029 #endif
1030 msgqueue_addmsg(&info->scsi.msgs, 1, ABORT);
1031 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1032 info->scsi.aborting = 1;
1033 }
1034
1035 fas216_cmd(info, CMD_MSGACCEPTED);
1036 return;
1037
1038 initiator_error:
1039 printk(KERN_ERR "scsi%d.H: error during reselection: bytes",
1040 info->host->host_no);
1041 for (i = 0; i < cfis; i++)
1042 printk(" %02x", msg[i]);
1043 printk("\n");
1044 bad_message:
1045 fas216_cmd(info, CMD_SETATN);
1046 msgqueue_flush(&info->scsi.msgs);
1047 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1048 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1049 fas216_cmd(info, CMD_MSGACCEPTED);
1050 }
1051
fas216_parse_message(FAS216_Info * info,unsigned char * message,int msglen)1052 static void fas216_parse_message(FAS216_Info *info, unsigned char *message, int msglen)
1053 {
1054 int i;
1055
1056 switch (message[0]) {
1057 case COMMAND_COMPLETE:
1058 if (msglen != 1)
1059 goto unrecognised;
1060
1061 printk(KERN_ERR "scsi%d.%c: command complete with no "
1062 "status in MESSAGE_IN?\n",
1063 info->host->host_no, fas216_target(info));
1064 break;
1065
1066 case SAVE_POINTERS:
1067 if (msglen != 1)
1068 goto unrecognised;
1069
1070 /*
1071 * Save current data pointer to SAVED data pointer
1072 * SCSI II standard says that we must not acknowledge
1073 * this until we have really saved pointers.
1074 * NOTE: we DO NOT save the command nor status pointers
1075 * as required by the SCSI II standard. These always
1076 * point to the start of their respective areas.
1077 */
1078 info->SCpnt->SCp = info->scsi.SCp;
1079 info->SCpnt->SCp.sent_command = 0;
1080 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
1081 "save data pointers: [%p, %X]",
1082 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1083 break;
1084
1085 case RESTORE_POINTERS:
1086 if (msglen != 1)
1087 goto unrecognised;
1088
1089 /*
1090 * Restore current data pointer from SAVED data pointer
1091 */
1092 info->scsi.SCp = info->SCpnt->SCp;
1093 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
1094 "restore data pointers: [%p, 0x%x]",
1095 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1096 break;
1097
1098 case DISCONNECT:
1099 if (msglen != 1)
1100 goto unrecognised;
1101
1102 info->scsi.phase = PHASE_MSGIN_DISCONNECT;
1103 break;
1104
1105 case MESSAGE_REJECT:
1106 if (msglen != 1)
1107 goto unrecognised;
1108
1109 switch (fas216_get_last_msg(info, info->scsi.msgin_fifo)) {
1110 case EXTENDED_MESSAGE | EXTENDED_SDTR << 8:
1111 fas216_handlesync(info, message);
1112 break;
1113
1114 default:
1115 fas216_log(info, 0, "reject, last message 0x%04x",
1116 fas216_get_last_msg(info, info->scsi.msgin_fifo));
1117 }
1118 break;
1119
1120 case NOP:
1121 break;
1122
1123 case EXTENDED_MESSAGE:
1124 if (msglen < 3)
1125 goto unrecognised;
1126
1127 switch (message[2]) {
1128 case EXTENDED_SDTR: /* Sync transfer negotiation request/reply */
1129 fas216_handlesync(info, message);
1130 break;
1131
1132 default:
1133 goto unrecognised;
1134 }
1135 break;
1136
1137 default:
1138 goto unrecognised;
1139 }
1140 return;
1141
1142 unrecognised:
1143 fas216_log(info, 0, "unrecognised message, rejecting");
1144 printk("scsi%d.%c: message was", info->host->host_no, fas216_target(info));
1145 for (i = 0; i < msglen; i++)
1146 printk("%s%02X", i & 31 ? " " : "\n ", message[i]);
1147 printk("\n");
1148
1149 /*
1150 * Something strange seems to be happening here -
1151 * I can't use SETATN since the chip gives me an
1152 * invalid command interrupt when I do. Weird.
1153 */
1154 fas216_cmd(info, CMD_NOP);
1155 fas216_dumpstate(info);
1156 fas216_cmd(info, CMD_SETATN);
1157 msgqueue_flush(&info->scsi.msgs);
1158 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
1159 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1160 fas216_dumpstate(info);
1161 }
1162
fas216_wait_cmd(FAS216_Info * info,int cmd)1163 static int fas216_wait_cmd(FAS216_Info *info, int cmd)
1164 {
1165 int tout;
1166 int stat;
1167
1168 fas216_cmd(info, cmd);
1169
1170 for (tout = 1000; tout; tout -= 1) {
1171 stat = fas216_readb(info, REG_STAT);
1172 if (stat & (STAT_INT|STAT_PARITYERROR))
1173 break;
1174 udelay(1);
1175 }
1176
1177 return stat;
1178 }
1179
fas216_get_msg_byte(FAS216_Info * info)1180 static int fas216_get_msg_byte(FAS216_Info *info)
1181 {
1182 unsigned int stat = fas216_wait_cmd(info, CMD_MSGACCEPTED);
1183
1184 if ((stat & STAT_INT) == 0)
1185 goto timedout;
1186
1187 if ((stat & STAT_BUSMASK) != STAT_MESGIN)
1188 goto unexpected_phase_change;
1189
1190 fas216_readb(info, REG_INST);
1191
1192 stat = fas216_wait_cmd(info, CMD_TRANSFERINFO);
1193
1194 if ((stat & STAT_INT) == 0)
1195 goto timedout;
1196
1197 if (stat & STAT_PARITYERROR)
1198 goto parity_error;
1199
1200 if ((stat & STAT_BUSMASK) != STAT_MESGIN)
1201 goto unexpected_phase_change;
1202
1203 fas216_readb(info, REG_INST);
1204
1205 return fas216_readb(info, REG_FF);
1206
1207 timedout:
1208 fas216_log(info, LOG_ERROR, "timed out waiting for message byte");
1209 return -1;
1210
1211 unexpected_phase_change:
1212 fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat);
1213 return -2;
1214
1215 parity_error:
1216 fas216_log(info, LOG_ERROR, "parity error during message in phase");
1217 return -3;
1218 }
1219
1220 /**
1221 * fas216_message - handle a function done interrupt from FAS216 chip
1222 * @info: interface which caused function done interrupt
1223 *
1224 * Handle a function done interrupt from FAS216 chip
1225 */
fas216_message(FAS216_Info * info)1226 static void fas216_message(FAS216_Info *info)
1227 {
1228 unsigned char *message = info->scsi.message;
1229 unsigned int msglen = 1;
1230 int msgbyte = 0;
1231
1232 fas216_checkmagic(info);
1233
1234 message[0] = fas216_readb(info, REG_FF);
1235
1236 if (message[0] == EXTENDED_MESSAGE) {
1237 msgbyte = fas216_get_msg_byte(info);
1238
1239 if (msgbyte >= 0) {
1240 message[1] = msgbyte;
1241
1242 for (msglen = 2; msglen < message[1] + 2; msglen++) {
1243 msgbyte = fas216_get_msg_byte(info);
1244
1245 if (msgbyte >= 0)
1246 message[msglen] = msgbyte;
1247 else
1248 break;
1249 }
1250 }
1251 }
1252
1253 if (msgbyte == -3)
1254 goto parity_error;
1255
1256 #ifdef DEBUG_MESSAGES
1257 {
1258 int i;
1259
1260 printk("scsi%d.%c: message in: ",
1261 info->host->host_no, fas216_target(info));
1262 for (i = 0; i < msglen; i++)
1263 printk("%02X ", message[i]);
1264 printk("\n");
1265 }
1266 #endif
1267
1268 fas216_parse_message(info, message, msglen);
1269 fas216_cmd(info, CMD_MSGACCEPTED);
1270 return;
1271
1272 parity_error:
1273 fas216_cmd(info, CMD_SETATN);
1274 msgqueue_flush(&info->scsi.msgs);
1275 msgqueue_addmsg(&info->scsi.msgs, 1, MSG_PARITY_ERROR);
1276 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1277 fas216_cmd(info, CMD_MSGACCEPTED);
1278 return;
1279 }
1280
1281 /**
1282 * fas216_send_command - send command after all message bytes have been sent
1283 * @info: interface which caused bus service
1284 *
1285 * Send a command to a target after all message bytes have been sent
1286 */
fas216_send_command(FAS216_Info * info)1287 static void fas216_send_command(FAS216_Info *info)
1288 {
1289 int i;
1290
1291 fas216_checkmagic(info);
1292
1293 fas216_cmd(info, CMD_NOP|CMD_WITHDMA);
1294 fas216_cmd(info, CMD_FLUSHFIFO);
1295
1296 /* load command */
1297 for (i = info->scsi.SCp.sent_command; i < info->SCpnt->cmd_len; i++)
1298 fas216_writeb(info, REG_FF, info->SCpnt->cmnd[i]);
1299
1300 fas216_cmd(info, CMD_TRANSFERINFO);
1301
1302 info->scsi.phase = PHASE_COMMAND;
1303 }
1304
1305 /**
1306 * fas216_send_messageout - handle bus service to send a message
1307 * @info: interface which caused bus service
1308 *
1309 * Handle bus service to send a message.
1310 * Note: We do not allow the device to change the data direction!
1311 */
fas216_send_messageout(FAS216_Info * info,int start)1312 static void fas216_send_messageout(FAS216_Info *info, int start)
1313 {
1314 unsigned int tot_msglen = msgqueue_msglength(&info->scsi.msgs);
1315
1316 fas216_checkmagic(info);
1317
1318 fas216_cmd(info, CMD_FLUSHFIFO);
1319
1320 if (tot_msglen) {
1321 struct message *msg;
1322 int msgnr = 0;
1323
1324 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1325 int i;
1326
1327 for (i = start; i < msg->length; i++)
1328 fas216_writeb(info, REG_FF, msg->msg[i]);
1329
1330 msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
1331 start = 0;
1332 }
1333 } else
1334 fas216_writeb(info, REG_FF, NOP);
1335
1336 fas216_cmd(info, CMD_TRANSFERINFO);
1337
1338 info->scsi.phase = PHASE_MSGOUT;
1339 }
1340
1341 /**
1342 * fas216_busservice_intr - handle bus service interrupt from FAS216 chip
1343 * @info: interface which caused bus service interrupt
1344 * @stat: Status register contents
1345 * @is: SCSI Status register contents
1346 *
1347 * Handle a bus service interrupt from FAS216 chip
1348 */
fas216_busservice_intr(FAS216_Info * info,unsigned int stat,unsigned int is)1349 static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
1350 {
1351 fas216_checkmagic(info);
1352
1353 fas216_log(info, LOG_BUSSERVICE,
1354 "bus service: stat=%02x is=%02x phase=%02x",
1355 stat, is, info->scsi.phase);
1356
1357 switch (info->scsi.phase) {
1358 case PHASE_SELECTION:
1359 if ((is & IS_BITS) != IS_MSGBYTESENT)
1360 goto bad_is;
1361 break;
1362
1363 case PHASE_SELSTEPS:
1364 switch (is & IS_BITS) {
1365 case IS_SELARB:
1366 case IS_MSGBYTESENT:
1367 goto bad_is;
1368
1369 case IS_NOTCOMMAND:
1370 case IS_EARLYPHASE:
1371 if ((stat & STAT_BUSMASK) == STAT_MESGIN)
1372 break;
1373 goto bad_is;
1374
1375 case IS_COMPLETE:
1376 break;
1377 }
1378
1379 default:
1380 break;
1381 }
1382
1383 fas216_cmd(info, CMD_NOP);
1384
1385 #define STATE(st,ph) ((ph) << 3 | (st))
1386 /* This table describes the legal SCSI state transitions,
1387 * as described by the SCSI II spec.
1388 */
1389 switch (STATE(stat & STAT_BUSMASK, info->scsi.phase)) {
1390 case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In */
1391 case STATE(STAT_DATAIN, PHASE_MSGOUT): /* Message Out -> Data In */
1392 case STATE(STAT_DATAIN, PHASE_COMMAND): /* Command -> Data In */
1393 case STATE(STAT_DATAIN, PHASE_MSGIN): /* Message In -> Data In */
1394 info->scsi.phase = PHASE_DATAIN;
1395 fas216_transfer(info);
1396 return;
1397
1398 case STATE(STAT_DATAIN, PHASE_DATAIN): /* Data In -> Data In */
1399 case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out -> Data Out */
1400 fas216_cleanuptransfer(info);
1401 fas216_transfer(info);
1402 return;
1403
1404 case STATE(STAT_DATAOUT, PHASE_SELSTEPS):/* Sel w/ steps-> Data Out */
1405 case STATE(STAT_DATAOUT, PHASE_MSGOUT): /* Message Out -> Data Out */
1406 case STATE(STAT_DATAOUT, PHASE_COMMAND):/* Command -> Data Out */
1407 case STATE(STAT_DATAOUT, PHASE_MSGIN): /* Message In -> Data Out */
1408 fas216_cmd(info, CMD_FLUSHFIFO);
1409 info->scsi.phase = PHASE_DATAOUT;
1410 fas216_transfer(info);
1411 return;
1412
1413 case STATE(STAT_STATUS, PHASE_DATAOUT): /* Data Out -> Status */
1414 case STATE(STAT_STATUS, PHASE_DATAIN): /* Data In -> Status */
1415 fas216_stoptransfer(info);
1416 fallthrough;
1417
1418 case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status */
1419 case STATE(STAT_STATUS, PHASE_MSGOUT): /* Message Out -> Status */
1420 case STATE(STAT_STATUS, PHASE_COMMAND): /* Command -> Status */
1421 case STATE(STAT_STATUS, PHASE_MSGIN): /* Message In -> Status */
1422 fas216_cmd(info, CMD_INITCMDCOMPLETE);
1423 info->scsi.phase = PHASE_STATUS;
1424 return;
1425
1426 case STATE(STAT_MESGIN, PHASE_DATAOUT): /* Data Out -> Message In */
1427 case STATE(STAT_MESGIN, PHASE_DATAIN): /* Data In -> Message In */
1428 fas216_stoptransfer(info);
1429 fallthrough;
1430
1431 case STATE(STAT_MESGIN, PHASE_COMMAND): /* Command -> Message In */
1432 case STATE(STAT_MESGIN, PHASE_SELSTEPS):/* Sel w/ steps -> Message In */
1433 case STATE(STAT_MESGIN, PHASE_MSGOUT): /* Message Out -> Message In */
1434 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1435 fas216_cmd(info, CMD_FLUSHFIFO);
1436 fas216_cmd(info, CMD_TRANSFERINFO);
1437 info->scsi.phase = PHASE_MSGIN;
1438 return;
1439
1440 case STATE(STAT_MESGIN, PHASE_MSGIN):
1441 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1442 fas216_cmd(info, CMD_TRANSFERINFO);
1443 return;
1444
1445 case STATE(STAT_COMMAND, PHASE_MSGOUT): /* Message Out -> Command */
1446 case STATE(STAT_COMMAND, PHASE_MSGIN): /* Message In -> Command */
1447 fas216_send_command(info);
1448 info->scsi.phase = PHASE_COMMAND;
1449 return;
1450
1451
1452 /*
1453 * Selection -> Message Out
1454 */
1455 case STATE(STAT_MESGOUT, PHASE_SELECTION):
1456 fas216_send_messageout(info, 1);
1457 return;
1458
1459 /*
1460 * Message Out -> Message Out
1461 */
1462 case STATE(STAT_MESGOUT, PHASE_SELSTEPS):
1463 case STATE(STAT_MESGOUT, PHASE_MSGOUT):
1464 /*
1465 * If we get another message out phase, this usually
1466 * means some parity error occurred. Resend complete
1467 * set of messages. If we have more than one byte to
1468 * send, we need to assert ATN again.
1469 */
1470 if (info->device[info->SCpnt->device->id].parity_check) {
1471 /*
1472 * We were testing... good, the device
1473 * supports parity checking.
1474 */
1475 info->device[info->SCpnt->device->id].parity_check = 0;
1476 info->device[info->SCpnt->device->id].parity_enabled = 1;
1477 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1478 }
1479
1480 if (msgqueue_msglength(&info->scsi.msgs) > 1)
1481 fas216_cmd(info, CMD_SETATN);
1482 /*FALLTHROUGH*/
1483
1484 /*
1485 * Any -> Message Out
1486 */
1487 case STATE(STAT_MESGOUT, PHASE_MSGOUT_EXPECT):
1488 fas216_send_messageout(info, 0);
1489 return;
1490
1491 /* Error recovery rules.
1492 * These either attempt to abort or retry the operation.
1493 * TODO: we need more of these
1494 */
1495 case STATE(STAT_COMMAND, PHASE_COMMAND):/* Command -> Command */
1496 /* error - we've sent out all the command bytes
1497 * we have.
1498 * NOTE: we need SAVE DATA POINTERS/RESTORE DATA POINTERS
1499 * to include the command bytes sent for this to work
1500 * correctly.
1501 */
1502 printk(KERN_ERR "scsi%d.%c: "
1503 "target trying to receive more command bytes\n",
1504 info->host->host_no, fas216_target(info));
1505 fas216_cmd(info, CMD_SETATN);
1506 fas216_set_stc(info, 15);
1507 fas216_cmd(info, CMD_PADBYTES | CMD_WITHDMA);
1508 msgqueue_flush(&info->scsi.msgs);
1509 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1510 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1511 return;
1512 }
1513
1514 if (info->scsi.phase == PHASE_MSGIN_DISCONNECT) {
1515 printk(KERN_ERR "scsi%d.%c: disconnect message received, but bus service %s?\n",
1516 info->host->host_no, fas216_target(info),
1517 fas216_bus_phase(stat));
1518 msgqueue_flush(&info->scsi.msgs);
1519 fas216_cmd(info, CMD_SETATN);
1520 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1521 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1522 info->scsi.aborting = 1;
1523 fas216_cmd(info, CMD_TRANSFERINFO);
1524 return;
1525 }
1526 printk(KERN_ERR "scsi%d.%c: bus phase %s after %s?\n",
1527 info->host->host_no, fas216_target(info),
1528 fas216_bus_phase(stat),
1529 fas216_drv_phase(info));
1530 print_debug_list();
1531 return;
1532
1533 bad_is:
1534 fas216_log(info, 0, "bus service at step %d?", is & IS_BITS);
1535 fas216_dumpstate(info);
1536 print_debug_list();
1537
1538 fas216_done(info, DID_ERROR);
1539 }
1540
1541 /**
1542 * fas216_funcdone_intr - handle a function done interrupt from FAS216 chip
1543 * @info: interface which caused function done interrupt
1544 * @stat: Status register contents
1545 * @is: SCSI Status register contents
1546 *
1547 * Handle a function done interrupt from FAS216 chip
1548 */
fas216_funcdone_intr(FAS216_Info * info,unsigned int stat,unsigned int is)1549 static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
1550 {
1551 unsigned int fifo_len = fas216_readb(info, REG_CFIS) & CFIS_CF;
1552
1553 fas216_checkmagic(info);
1554
1555 fas216_log(info, LOG_FUNCTIONDONE,
1556 "function done: stat=%02x is=%02x phase=%02x",
1557 stat, is, info->scsi.phase);
1558
1559 switch (info->scsi.phase) {
1560 case PHASE_STATUS: /* status phase - read status and msg */
1561 if (fifo_len != 2) {
1562 fas216_log(info, 0, "odd number of bytes in FIFO: %d", fifo_len);
1563 }
1564 /*
1565 * Read status then message byte.
1566 */
1567 info->scsi.SCp.Status = fas216_readb(info, REG_FF);
1568 info->scsi.SCp.Message = fas216_readb(info, REG_FF);
1569 info->scsi.phase = PHASE_DONE;
1570 fas216_cmd(info, CMD_MSGACCEPTED);
1571 break;
1572
1573 case PHASE_IDLE:
1574 case PHASE_SELECTION:
1575 case PHASE_SELSTEPS:
1576 break;
1577
1578 case PHASE_MSGIN: /* message in phase */
1579 if ((stat & STAT_BUSMASK) == STAT_MESGIN) {
1580 info->scsi.msgin_fifo = fifo_len;
1581 fas216_message(info);
1582 break;
1583 }
1584 fallthrough;
1585
1586 default:
1587 fas216_log(info, 0, "internal phase %s for function done?"
1588 " What do I do with this?",
1589 fas216_target(info), fas216_drv_phase(info));
1590 }
1591 }
1592
fas216_bus_reset(FAS216_Info * info)1593 static void fas216_bus_reset(FAS216_Info *info)
1594 {
1595 neg_t sync_state;
1596 int i;
1597
1598 msgqueue_flush(&info->scsi.msgs);
1599
1600 sync_state = neg_invalid;
1601
1602 #ifdef SCSI2_SYNC
1603 if (info->ifcfg.capabilities & (FASCAP_DMA|FASCAP_PSEUDODMA))
1604 sync_state = neg_wait;
1605 #endif
1606
1607 info->scsi.phase = PHASE_IDLE;
1608 info->SCpnt = NULL; /* bug! */
1609 memset(&info->scsi.SCp, 0, sizeof(info->scsi.SCp));
1610
1611 for (i = 0; i < 8; i++) {
1612 info->device[i].disconnect_ok = info->ifcfg.disconnect_ok;
1613 info->device[i].sync_state = sync_state;
1614 info->device[i].period = info->ifcfg.asyncperiod / 4;
1615 info->device[i].stp = info->scsi.async_stp;
1616 info->device[i].sof = 0;
1617 info->device[i].wide_xfer = 0;
1618 }
1619
1620 info->rst_bus_status = 1;
1621 wake_up(&info->eh_wait);
1622 }
1623
1624 /**
1625 * fas216_intr - handle interrupts to progress a command
1626 * @info: interface to service
1627 *
1628 * Handle interrupts from the interface to progress a command
1629 */
fas216_intr(FAS216_Info * info)1630 irqreturn_t fas216_intr(FAS216_Info *info)
1631 {
1632 unsigned char inst, is, stat;
1633 int handled = IRQ_NONE;
1634
1635 fas216_checkmagic(info);
1636
1637 stat = fas216_readb(info, REG_STAT);
1638 is = fas216_readb(info, REG_IS);
1639 inst = fas216_readb(info, REG_INST);
1640
1641 add_debug_list(stat, is, inst, info->scsi.phase);
1642
1643 if (stat & STAT_INT) {
1644 if (inst & INST_BUSRESET) {
1645 fas216_log(info, 0, "bus reset detected");
1646 fas216_bus_reset(info);
1647 scsi_report_bus_reset(info->host, 0);
1648 } else if (inst & INST_ILLEGALCMD) {
1649 fas216_log(info, LOG_ERROR, "illegal command given\n");
1650 fas216_dumpstate(info);
1651 print_debug_list();
1652 } else if (inst & INST_DISCONNECT)
1653 fas216_disconnect_intr(info);
1654 else if (inst & INST_RESELECTED) /* reselected */
1655 fas216_reselected_intr(info);
1656 else if (inst & INST_BUSSERVICE) /* bus service request */
1657 fas216_busservice_intr(info, stat, is);
1658 else if (inst & INST_FUNCDONE) /* function done */
1659 fas216_funcdone_intr(info, stat, is);
1660 else
1661 fas216_log(info, 0, "unknown interrupt received:"
1662 " phase %s inst %02X is %02X stat %02X",
1663 fas216_drv_phase(info), inst, is, stat);
1664 handled = IRQ_HANDLED;
1665 }
1666 return handled;
1667 }
1668
__fas216_start_command(FAS216_Info * info,struct scsi_cmnd * SCpnt)1669 static void __fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1670 {
1671 int tot_msglen;
1672
1673 /* following what the ESP driver says */
1674 fas216_set_stc(info, 0);
1675 fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1676
1677 /* flush FIFO */
1678 fas216_cmd(info, CMD_FLUSHFIFO);
1679
1680 /* load bus-id and timeout */
1681 fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1682 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1683
1684 /* synchronous transfers */
1685 fas216_set_sync(info, SCpnt->device->id);
1686
1687 tot_msglen = msgqueue_msglength(&info->scsi.msgs);
1688
1689 #ifdef DEBUG_MESSAGES
1690 {
1691 struct message *msg;
1692 int msgnr = 0, i;
1693
1694 printk("scsi%d.%c: message out: ",
1695 info->host->host_no, '0' + SCpnt->device->id);
1696 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1697 printk("{ ");
1698 for (i = 0; i < msg->length; i++)
1699 printk("%02x ", msg->msg[i]);
1700 printk("} ");
1701 }
1702 printk("\n");
1703 }
1704 #endif
1705
1706 if (tot_msglen == 1 || tot_msglen == 3) {
1707 /*
1708 * We have an easy message length to send...
1709 */
1710 struct message *msg;
1711 int msgnr = 0, i;
1712
1713 info->scsi.phase = PHASE_SELSTEPS;
1714
1715 /* load message bytes */
1716 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1717 for (i = 0; i < msg->length; i++)
1718 fas216_writeb(info, REG_FF, msg->msg[i]);
1719 msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
1720 }
1721
1722 /* load command */
1723 for (i = 0; i < SCpnt->cmd_len; i++)
1724 fas216_writeb(info, REG_FF, SCpnt->cmnd[i]);
1725
1726 if (tot_msglen == 1)
1727 fas216_cmd(info, CMD_SELECTATN);
1728 else
1729 fas216_cmd(info, CMD_SELECTATN3);
1730 } else {
1731 /*
1732 * We have an unusual number of message bytes to send.
1733 * Load first byte into fifo, and issue SELECT with ATN and
1734 * stop steps.
1735 */
1736 struct message *msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1737
1738 fas216_writeb(info, REG_FF, msg->msg[0]);
1739 msg->fifo = 1;
1740
1741 fas216_cmd(info, CMD_SELECTATNSTOP);
1742 }
1743 }
1744
1745 /*
1746 * Decide whether we need to perform a parity test on this device.
1747 * Can also be used to force parity error conditions during initial
1748 * information transfer phase (message out) for test purposes.
1749 */
parity_test(FAS216_Info * info,int target)1750 static int parity_test(FAS216_Info *info, int target)
1751 {
1752 #if 0
1753 if (target == 3) {
1754 info->device[target].parity_check = 0;
1755 return 1;
1756 }
1757 #endif
1758 return info->device[target].parity_check;
1759 }
1760
fas216_start_command(FAS216_Info * info,struct scsi_cmnd * SCpnt)1761 static void fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1762 {
1763 int disconnect_ok;
1764
1765 /*
1766 * claim host busy
1767 */
1768 info->scsi.phase = PHASE_SELECTION;
1769 info->scsi.SCp = SCpnt->SCp;
1770 info->SCpnt = SCpnt;
1771 info->dma.transfer_type = fasdma_none;
1772
1773 if (parity_test(info, SCpnt->device->id))
1774 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_PTE);
1775 else
1776 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1777
1778 /*
1779 * Don't allow request sense commands to disconnect.
1780 */
1781 disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE &&
1782 info->device[SCpnt->device->id].disconnect_ok;
1783
1784 /*
1785 * build outgoing message bytes
1786 */
1787 msgqueue_flush(&info->scsi.msgs);
1788 msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->device->lun));
1789
1790 /*
1791 * add tag message if required
1792 */
1793 if (SCpnt->tag)
1794 msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG, SCpnt->tag);
1795
1796 do {
1797 #ifdef SCSI2_SYNC
1798 if ((info->device[SCpnt->device->id].sync_state == neg_wait ||
1799 info->device[SCpnt->device->id].sync_state == neg_complete) &&
1800 (SCpnt->cmnd[0] == REQUEST_SENSE ||
1801 SCpnt->cmnd[0] == INQUIRY)) {
1802 info->device[SCpnt->device->id].sync_state = neg_inprogress;
1803 msgqueue_addmsg(&info->scsi.msgs, 5,
1804 EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
1805 1000 / info->ifcfg.clockrate,
1806 info->ifcfg.sync_max_depth);
1807 break;
1808 }
1809 #endif
1810 } while (0);
1811
1812 __fas216_start_command(info, SCpnt);
1813 }
1814
fas216_allocate_tag(FAS216_Info * info,struct scsi_cmnd * SCpnt)1815 static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1816 {
1817 #ifdef SCSI2_TAG
1818 /*
1819 * tagged queuing - allocate a new tag to this command
1820 */
1821 if (SCpnt->device->simple_tags && SCpnt->cmnd[0] != REQUEST_SENSE &&
1822 SCpnt->cmnd[0] != INQUIRY) {
1823 SCpnt->device->current_tag += 1;
1824 if (SCpnt->device->current_tag == 0)
1825 SCpnt->device->current_tag = 1;
1826 SCpnt->tag = SCpnt->device->current_tag;
1827 } else
1828 #endif
1829 set_bit(SCpnt->device->id * 8 +
1830 (u8)(SCpnt->device->lun & 0x7), info->busyluns);
1831
1832 info->stats.removes += 1;
1833 switch (SCpnt->cmnd[0]) {
1834 case WRITE_6:
1835 case WRITE_10:
1836 case WRITE_12:
1837 info->stats.writes += 1;
1838 break;
1839 case READ_6:
1840 case READ_10:
1841 case READ_12:
1842 info->stats.reads += 1;
1843 break;
1844 default:
1845 info->stats.miscs += 1;
1846 break;
1847 }
1848 }
1849
fas216_do_bus_device_reset(FAS216_Info * info,struct scsi_cmnd * SCpnt)1850 static void fas216_do_bus_device_reset(FAS216_Info *info,
1851 struct scsi_cmnd *SCpnt)
1852 {
1853 struct message *msg;
1854
1855 /*
1856 * claim host busy
1857 */
1858 info->scsi.phase = PHASE_SELECTION;
1859 info->scsi.SCp = SCpnt->SCp;
1860 info->SCpnt = SCpnt;
1861 info->dma.transfer_type = fasdma_none;
1862
1863 fas216_log(info, LOG_ERROR, "sending bus device reset");
1864
1865 msgqueue_flush(&info->scsi.msgs);
1866 msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET);
1867
1868 /* following what the ESP driver says */
1869 fas216_set_stc(info, 0);
1870 fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1871
1872 /* flush FIFO */
1873 fas216_cmd(info, CMD_FLUSHFIFO);
1874
1875 /* load bus-id and timeout */
1876 fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1877 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1878
1879 /* synchronous transfers */
1880 fas216_set_sync(info, SCpnt->device->id);
1881
1882 msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1883
1884 fas216_writeb(info, REG_FF, BUS_DEVICE_RESET);
1885 msg->fifo = 1;
1886
1887 fas216_cmd(info, CMD_SELECTATNSTOP);
1888 }
1889
1890 /**
1891 * fas216_kick - kick a command to the interface
1892 * @info: our host interface to kick
1893 *
1894 * Kick a command to the interface, interface should be idle.
1895 * Notes: Interrupts are always disabled!
1896 */
fas216_kick(FAS216_Info * info)1897 static void fas216_kick(FAS216_Info *info)
1898 {
1899 struct scsi_cmnd *SCpnt = NULL;
1900 #define TYPE_OTHER 0
1901 #define TYPE_RESET 1
1902 #define TYPE_QUEUE 2
1903 int where_from = TYPE_OTHER;
1904
1905 fas216_checkmagic(info);
1906
1907 /*
1908 * Obtain the next command to process.
1909 */
1910 do {
1911 if (info->rstSCpnt) {
1912 SCpnt = info->rstSCpnt;
1913 /* don't remove it */
1914 where_from = TYPE_RESET;
1915 break;
1916 }
1917
1918 if (info->reqSCpnt) {
1919 SCpnt = info->reqSCpnt;
1920 info->reqSCpnt = NULL;
1921 break;
1922 }
1923
1924 if (info->origSCpnt) {
1925 SCpnt = info->origSCpnt;
1926 info->origSCpnt = NULL;
1927 break;
1928 }
1929
1930 /* retrieve next command */
1931 if (!SCpnt) {
1932 SCpnt = queue_remove_exclude(&info->queues.issue,
1933 info->busyluns);
1934 where_from = TYPE_QUEUE;
1935 break;
1936 }
1937 } while (0);
1938
1939 if (!SCpnt) {
1940 /*
1941 * no command pending, so enable reselection.
1942 */
1943 fas216_cmd(info, CMD_ENABLESEL);
1944 return;
1945 }
1946
1947 /*
1948 * We're going to start a command, so disable reselection
1949 */
1950 fas216_cmd(info, CMD_DISABLESEL);
1951
1952 if (info->scsi.disconnectable && info->SCpnt) {
1953 fas216_log(info, LOG_CONNECT,
1954 "moved command for %d to disconnected queue",
1955 info->SCpnt->device->id);
1956 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
1957 info->scsi.disconnectable = 0;
1958 info->SCpnt = NULL;
1959 }
1960
1961 fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt,
1962 "starting");
1963
1964 switch (where_from) {
1965 case TYPE_QUEUE:
1966 fas216_allocate_tag(info, SCpnt);
1967 fallthrough;
1968 case TYPE_OTHER:
1969 fas216_start_command(info, SCpnt);
1970 break;
1971 case TYPE_RESET:
1972 fas216_do_bus_device_reset(info, SCpnt);
1973 break;
1974 }
1975
1976 fas216_log(info, LOG_CONNECT, "select: data pointers [%p, %X]",
1977 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1978
1979 /*
1980 * should now get either DISCONNECT or
1981 * (FUNCTION DONE with BUS SERVICE) interrupt
1982 */
1983 }
1984
1985 /*
1986 * Clean up from issuing a BUS DEVICE RESET message to a device.
1987 */
fas216_devicereset_done(FAS216_Info * info,struct scsi_cmnd * SCpnt,unsigned int result)1988 static void fas216_devicereset_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
1989 unsigned int result)
1990 {
1991 fas216_log(info, LOG_ERROR, "fas216 device reset complete");
1992
1993 info->rstSCpnt = NULL;
1994 info->rst_dev_status = 1;
1995 wake_up(&info->eh_wait);
1996 }
1997
1998 /**
1999 * fas216_rq_sns_done - Finish processing automatic request sense command
2000 * @info: interface that completed
2001 * @SCpnt: command that completed
2002 * @result: driver byte of result
2003 *
2004 * Finish processing automatic request sense command
2005 */
fas216_rq_sns_done(FAS216_Info * info,struct scsi_cmnd * SCpnt,unsigned int result)2006 static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
2007 unsigned int result)
2008 {
2009 fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
2010 "request sense complete, result=0x%04x%02x%02x",
2011 result, SCpnt->SCp.Message, SCpnt->SCp.Status);
2012
2013 if (result != DID_OK || SCpnt->SCp.Status != GOOD)
2014 /*
2015 * Something went wrong. Make sure that we don't
2016 * have valid data in the sense buffer that could
2017 * confuse the higher levels.
2018 */
2019 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2020 //printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id);
2021 //{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); }
2022 /*
2023 * Note that we don't set SCpnt->result, since that should
2024 * reflect the status of the command that we were asked by
2025 * the upper layers to process. This would have been set
2026 * correctly by fas216_std_done.
2027 */
2028 scsi_eh_restore_cmnd(SCpnt, &info->ses);
2029 SCpnt->scsi_done(SCpnt);
2030 }
2031
2032 /**
2033 * fas216_std_done - finish processing of standard command
2034 * @info: interface that completed
2035 * @SCpnt: command that completed
2036 * @result: driver byte of result
2037 *
2038 * Finish processing of standard command
2039 */
2040 static void
fas216_std_done(FAS216_Info * info,struct scsi_cmnd * SCpnt,unsigned int result)2041 fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result)
2042 {
2043 info->stats.fins += 1;
2044
2045 SCpnt->result = result << 16 | info->scsi.SCp.Message << 8 |
2046 info->scsi.SCp.Status;
2047
2048 fas216_log_command(info, LOG_CONNECT, SCpnt,
2049 "command complete, result=0x%08x", SCpnt->result);
2050
2051 /*
2052 * If the driver detected an error, we're all done.
2053 */
2054 if (host_byte(SCpnt->result) != DID_OK ||
2055 msg_byte(SCpnt->result) != COMMAND_COMPLETE)
2056 goto done;
2057
2058 /*
2059 * If the command returned CHECK_CONDITION or COMMAND_TERMINATED
2060 * status, request the sense information.
2061 */
2062 if (status_byte(SCpnt->result) == CHECK_CONDITION ||
2063 status_byte(SCpnt->result) == 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 (status_byte(SCpnt->result) != 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
2098 done:
2099 if (SCpnt->scsi_done) {
2100 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
2108 request_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 SCpnt->SCp.Message = 0;
2117 SCpnt->SCp.Status = 0;
2118 SCpnt->tag = 0;
2119 SCpnt->host_scribble = (void *)fas216_rq_sns_done;
2120
2121 /*
2122 * Place this command into the high priority "request
2123 * sense" slot. This will be the very next command
2124 * executed, unless a target connects to us.
2125 */
2126 if (info->reqSCpnt)
2127 printk(KERN_WARNING "scsi%d.%c: losing request command\n",
2128 info->host->host_no, '0' + SCpnt->device->id);
2129 info->reqSCpnt = SCpnt;
2130 }
2131
2132 /**
2133 * fas216_done - complete processing for current command
2134 * @info: interface that completed
2135 * @result: driver byte of result
2136 *
2137 * Complete processing for current command
2138 */
fas216_done(FAS216_Info * info,unsigned int result)2139 static void fas216_done(FAS216_Info *info, unsigned int result)
2140 {
2141 void (*fn)(FAS216_Info *, struct scsi_cmnd *, unsigned int);
2142 struct scsi_cmnd *SCpnt;
2143 unsigned long flags;
2144
2145 fas216_checkmagic(info);
2146
2147 if (!info->SCpnt)
2148 goto no_command;
2149
2150 SCpnt = info->SCpnt;
2151 info->SCpnt = NULL;
2152 info->scsi.phase = PHASE_IDLE;
2153
2154 if (info->scsi.aborting) {
2155 fas216_log(info, 0, "uncaught abort - returning DID_ABORT");
2156 result = DID_ABORT;
2157 info->scsi.aborting = 0;
2158 }
2159
2160 /*
2161 * Sanity check the completion - if we have zero bytes left
2162 * to transfer, we should not have a valid pointer.
2163 */
2164 if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) {
2165 scmd_printk(KERN_INFO, SCpnt,
2166 "zero bytes left to transfer, but buffer pointer still valid: ptr=%p len=%08x\n",
2167 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
2168 info->scsi.SCp.ptr = NULL;
2169 scsi_print_command(SCpnt);
2170 }
2171
2172 /*
2173 * Clear down this command as completed. If we need to request
2174 * the sense information, fas216_kick will re-assert the busy
2175 * status.
2176 */
2177 info->device[SCpnt->device->id].parity_check = 0;
2178 clear_bit(SCpnt->device->id * 8 +
2179 (u8)(SCpnt->device->lun & 0x7), info->busyluns);
2180
2181 fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble;
2182 fn(info, SCpnt, result);
2183
2184 if (info->scsi.irq) {
2185 spin_lock_irqsave(&info->host_lock, flags);
2186 if (info->scsi.phase == PHASE_IDLE)
2187 fas216_kick(info);
2188 spin_unlock_irqrestore(&info->host_lock, flags);
2189 }
2190 return;
2191
2192 no_command:
2193 panic("scsi%d.H: null command in fas216_done",
2194 info->host->host_no);
2195 }
2196
2197 /**
2198 * fas216_queue_command - queue a command for adapter to process.
2199 * @SCpnt: Command to queue
2200 * @done: done function to call once command is complete
2201 *
2202 * Queue a command for adapter to process.
2203 * Returns: 0 on success, else error.
2204 * Notes: io_request_lock is held, interrupts are disabled.
2205 */
fas216_queue_command_lck(struct scsi_cmnd * SCpnt,void (* done)(struct scsi_cmnd *))2206 static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt,
2207 void (*done)(struct scsi_cmnd *))
2208 {
2209 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2210 int result;
2211
2212 fas216_checkmagic(info);
2213
2214 fas216_log_command(info, LOG_CONNECT, SCpnt,
2215 "received command (%p)", SCpnt);
2216
2217 SCpnt->scsi_done = done;
2218 SCpnt->host_scribble = (void *)fas216_std_done;
2219 SCpnt->result = 0;
2220
2221 init_SCp(SCpnt);
2222
2223 info->stats.queues += 1;
2224 SCpnt->tag = 0;
2225
2226 spin_lock(&info->host_lock);
2227
2228 /*
2229 * Add command into execute queue and let it complete under
2230 * whatever scheme we're using.
2231 */
2232 result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt);
2233
2234 /*
2235 * If we successfully added the command,
2236 * kick the interface to get it moving.
2237 */
2238 if (result == 0 && info->scsi.phase == PHASE_IDLE)
2239 fas216_kick(info);
2240 spin_unlock(&info->host_lock);
2241
2242 fas216_log_target(info, LOG_CONNECT, -1, "queue %s",
2243 result ? "failure" : "success");
2244
2245 return result;
2246 }
2247
DEF_SCSI_QCMD(fas216_queue_command)2248 DEF_SCSI_QCMD(fas216_queue_command)
2249
2250 /**
2251 * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command
2252 * @SCpnt: Command to wake
2253 *
2254 * Trigger restart of a waiting thread in fas216_command
2255 */
2256 static void fas216_internal_done(struct scsi_cmnd *SCpnt)
2257 {
2258 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2259
2260 fas216_checkmagic(info);
2261
2262 info->internal_done = 1;
2263 }
2264
2265 /**
2266 * fas216_noqueue_command - process a command for the adapter.
2267 * @SCpnt: Command to queue
2268 *
2269 * Queue a command for adapter to process.
2270 * Returns: scsi result code.
2271 * Notes: io_request_lock is held, interrupts are disabled.
2272 */
fas216_noqueue_command_lck(struct scsi_cmnd * SCpnt,void (* done)(struct scsi_cmnd *))2273 static int fas216_noqueue_command_lck(struct scsi_cmnd *SCpnt,
2274 void (*done)(struct scsi_cmnd *))
2275 {
2276 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2277
2278 fas216_checkmagic(info);
2279
2280 /*
2281 * We should only be using this if we don't have an interrupt.
2282 * Provide some "incentive" to use the queueing code.
2283 */
2284 BUG_ON(info->scsi.irq);
2285
2286 info->internal_done = 0;
2287 fas216_queue_command_lck(SCpnt, fas216_internal_done);
2288
2289 /*
2290 * This wastes time, since we can't return until the command is
2291 * complete. We can't sleep either since we may get re-entered!
2292 * However, we must re-enable interrupts, or else we'll be
2293 * waiting forever.
2294 */
2295 spin_unlock_irq(info->host->host_lock);
2296
2297 while (!info->internal_done) {
2298 /*
2299 * If we don't have an IRQ, then we must poll the card for
2300 * it's interrupt, and use that to call this driver's
2301 * interrupt routine. That way, we keep the command
2302 * progressing. Maybe we can add some intelligence here
2303 * and go to sleep if we know that the device is going
2304 * to be some time (eg, disconnected).
2305 */
2306 if (fas216_readb(info, REG_STAT) & STAT_INT) {
2307 spin_lock_irq(info->host->host_lock);
2308 fas216_intr(info);
2309 spin_unlock_irq(info->host->host_lock);
2310 }
2311 }
2312
2313 spin_lock_irq(info->host->host_lock);
2314
2315 done(SCpnt);
2316
2317 return 0;
2318 }
2319
DEF_SCSI_QCMD(fas216_noqueue_command)2320 DEF_SCSI_QCMD(fas216_noqueue_command)
2321
2322 /*
2323 * Error handler timeout function. Indicate that we timed out,
2324 * and wake up any error handler process so it can continue.
2325 */
2326 static void fas216_eh_timer(struct timer_list *t)
2327 {
2328 FAS216_Info *info = from_timer(info, t, eh_timer);
2329
2330 fas216_log(info, LOG_ERROR, "error handling timed out\n");
2331
2332 del_timer(&info->eh_timer);
2333
2334 if (info->rst_bus_status == 0)
2335 info->rst_bus_status = -1;
2336 if (info->rst_dev_status == 0)
2337 info->rst_dev_status = -1;
2338
2339 wake_up(&info->eh_wait);
2340 }
2341
2342 enum res_find {
2343 res_failed, /* not found */
2344 res_success, /* command on issue queue */
2345 res_hw_abort /* command on disconnected dev */
2346 };
2347
2348 /**
2349 * fas216_do_abort - decide how to abort a command
2350 * @SCpnt: command to abort
2351 *
2352 * Decide how to abort a command.
2353 * Returns: abort status
2354 */
fas216_find_command(FAS216_Info * info,struct scsi_cmnd * SCpnt)2355 static enum res_find fas216_find_command(FAS216_Info *info,
2356 struct scsi_cmnd *SCpnt)
2357 {
2358 enum res_find res = res_failed;
2359
2360 if (queue_remove_cmd(&info->queues.issue, SCpnt)) {
2361 /*
2362 * The command was on the issue queue, and has not been
2363 * issued yet. We can remove the command from the queue,
2364 * and acknowledge the abort. Neither the device nor the
2365 * interface know about the command.
2366 */
2367 printk("on issue queue ");
2368
2369 res = res_success;
2370 } else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) {
2371 /*
2372 * The command was on the disconnected queue. We must
2373 * reconnect with the device if possible, and send it
2374 * an abort message.
2375 */
2376 printk("on disconnected queue ");
2377
2378 res = res_hw_abort;
2379 } else if (info->SCpnt == SCpnt) {
2380 printk("executing ");
2381
2382 switch (info->scsi.phase) {
2383 /*
2384 * If the interface is idle, and the command is 'disconnectable',
2385 * then it is the same as on the disconnected queue.
2386 */
2387 case PHASE_IDLE:
2388 if (info->scsi.disconnectable) {
2389 info->scsi.disconnectable = 0;
2390 info->SCpnt = NULL;
2391 res = res_hw_abort;
2392 }
2393 break;
2394
2395 default:
2396 break;
2397 }
2398 } else if (info->origSCpnt == SCpnt) {
2399 /*
2400 * The command will be executed next, but a command
2401 * is currently using the interface. This is similar to
2402 * being on the issue queue, except the busylun bit has
2403 * been set.
2404 */
2405 info->origSCpnt = NULL;
2406 clear_bit(SCpnt->device->id * 8 +
2407 (u8)(SCpnt->device->lun & 0x7), info->busyluns);
2408 printk("waiting for execution ");
2409 res = res_success;
2410 } else
2411 printk("unknown ");
2412
2413 return res;
2414 }
2415
2416 /**
2417 * fas216_eh_abort - abort this command
2418 * @SCpnt: command to abort
2419 *
2420 * Abort this command.
2421 * Returns: FAILED if unable to abort
2422 * Notes: io_request_lock is taken, and irqs are disabled
2423 */
fas216_eh_abort(struct scsi_cmnd * SCpnt)2424 int fas216_eh_abort(struct scsi_cmnd *SCpnt)
2425 {
2426 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2427 int result = FAILED;
2428
2429 fas216_checkmagic(info);
2430
2431 info->stats.aborts += 1;
2432
2433 scmd_printk(KERN_WARNING, SCpnt, "abort command\n");
2434
2435 print_debug_list();
2436 fas216_dumpstate(info);
2437
2438 switch (fas216_find_command(info, SCpnt)) {
2439 /*
2440 * We found the command, and cleared it out. Either
2441 * the command is still known to be executing on the
2442 * target, or the busylun bit is not set.
2443 */
2444 case res_success:
2445 scmd_printk(KERN_WARNING, SCpnt, "abort %p success\n", SCpnt);
2446 result = SUCCESS;
2447 break;
2448
2449 /*
2450 * We need to reconnect to the target and send it an
2451 * ABORT or ABORT_TAG message. We can only do this
2452 * if the bus is free.
2453 */
2454 case res_hw_abort:
2455
2456 /*
2457 * We are unable to abort the command for some reason.
2458 */
2459 default:
2460 case res_failed:
2461 scmd_printk(KERN_WARNING, SCpnt, "abort %p failed\n", SCpnt);
2462 break;
2463 }
2464
2465 return result;
2466 }
2467
2468 /**
2469 * fas216_eh_device_reset - Reset the device associated with this command
2470 * @SCpnt: command specifing device to reset
2471 *
2472 * Reset the device associated with this command.
2473 * Returns: FAILED if unable to reset.
2474 * Notes: We won't be re-entered, so we'll only have one device
2475 * reset on the go at one time.
2476 */
fas216_eh_device_reset(struct scsi_cmnd * SCpnt)2477 int fas216_eh_device_reset(struct scsi_cmnd *SCpnt)
2478 {
2479 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2480 unsigned long flags;
2481 int i, res = FAILED, target = SCpnt->device->id;
2482
2483 fas216_log(info, LOG_ERROR, "device reset for target %d", target);
2484
2485 spin_lock_irqsave(&info->host_lock, flags);
2486
2487 do {
2488 /*
2489 * If we are currently connected to a device, and
2490 * it is the device we want to reset, there is
2491 * nothing we can do here. Chances are it is stuck,
2492 * and we need a bus reset.
2493 */
2494 if (info->SCpnt && !info->scsi.disconnectable &&
2495 info->SCpnt->device->id == SCpnt->device->id)
2496 break;
2497
2498 /*
2499 * We're going to be resetting this device. Remove
2500 * all pending commands from the driver. By doing
2501 * so, we guarantee that we won't touch the command
2502 * structures except to process the reset request.
2503 */
2504 queue_remove_all_target(&info->queues.issue, target);
2505 queue_remove_all_target(&info->queues.disconnected, target);
2506 if (info->origSCpnt && info->origSCpnt->device->id == target)
2507 info->origSCpnt = NULL;
2508 if (info->reqSCpnt && info->reqSCpnt->device->id == target)
2509 info->reqSCpnt = NULL;
2510 for (i = 0; i < 8; i++)
2511 clear_bit(target * 8 + i, info->busyluns);
2512
2513 /*
2514 * Hijack this SCSI command structure to send
2515 * a bus device reset message to this device.
2516 */
2517 SCpnt->host_scribble = (void *)fas216_devicereset_done;
2518
2519 info->rst_dev_status = 0;
2520 info->rstSCpnt = SCpnt;
2521
2522 if (info->scsi.phase == PHASE_IDLE)
2523 fas216_kick(info);
2524
2525 mod_timer(&info->eh_timer, jiffies + 30 * HZ);
2526 spin_unlock_irqrestore(&info->host_lock, flags);
2527
2528 /*
2529 * Wait up to 30 seconds for the reset to complete.
2530 */
2531 wait_event(info->eh_wait, info->rst_dev_status);
2532
2533 del_timer_sync(&info->eh_timer);
2534 spin_lock_irqsave(&info->host_lock, flags);
2535 info->rstSCpnt = NULL;
2536
2537 if (info->rst_dev_status == 1)
2538 res = SUCCESS;
2539 } while (0);
2540
2541 SCpnt->host_scribble = NULL;
2542 spin_unlock_irqrestore(&info->host_lock, flags);
2543
2544 fas216_log(info, LOG_ERROR, "device reset complete: %s\n",
2545 res == SUCCESS ? "success" : "failed");
2546
2547 return res;
2548 }
2549
2550 /**
2551 * fas216_eh_bus_reset - Reset the bus associated with the command
2552 * @SCpnt: command specifing bus to reset
2553 *
2554 * Reset the bus associated with the command.
2555 * Returns: FAILED if unable to reset.
2556 * Notes: Further commands are blocked.
2557 */
fas216_eh_bus_reset(struct scsi_cmnd * SCpnt)2558 int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt)
2559 {
2560 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2561 unsigned long flags;
2562 struct scsi_device *SDpnt;
2563
2564 fas216_checkmagic(info);
2565 fas216_log(info, LOG_ERROR, "resetting bus");
2566
2567 info->stats.bus_resets += 1;
2568
2569 spin_lock_irqsave(&info->host_lock, flags);
2570
2571 /*
2572 * Stop all activity on this interface.
2573 */
2574 fas216_aborttransfer(info);
2575 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2576
2577 /*
2578 * Clear any pending interrupts.
2579 */
2580 while (fas216_readb(info, REG_STAT) & STAT_INT)
2581 fas216_readb(info, REG_INST);
2582
2583 info->rst_bus_status = 0;
2584
2585 /*
2586 * For each attached hard-reset device, clear out
2587 * all command structures. Leave the running
2588 * command in place.
2589 */
2590 shost_for_each_device(SDpnt, info->host) {
2591 int i;
2592
2593 if (SDpnt->soft_reset)
2594 continue;
2595
2596 queue_remove_all_target(&info->queues.issue, SDpnt->id);
2597 queue_remove_all_target(&info->queues.disconnected, SDpnt->id);
2598 if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id)
2599 info->origSCpnt = NULL;
2600 if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id)
2601 info->reqSCpnt = NULL;
2602 info->SCpnt = NULL;
2603
2604 for (i = 0; i < 8; i++)
2605 clear_bit(SDpnt->id * 8 + i, info->busyluns);
2606 }
2607
2608 info->scsi.phase = PHASE_IDLE;
2609
2610 /*
2611 * Reset the SCSI bus. Device cleanup happens in
2612 * the interrupt handler.
2613 */
2614 fas216_cmd(info, CMD_RESETSCSI);
2615
2616 mod_timer(&info->eh_timer, jiffies + HZ);
2617 spin_unlock_irqrestore(&info->host_lock, flags);
2618
2619 /*
2620 * Wait one second for the interrupt.
2621 */
2622 wait_event(info->eh_wait, info->rst_bus_status);
2623 del_timer_sync(&info->eh_timer);
2624
2625 fas216_log(info, LOG_ERROR, "bus reset complete: %s\n",
2626 info->rst_bus_status == 1 ? "success" : "failed");
2627
2628 return info->rst_bus_status == 1 ? SUCCESS : FAILED;
2629 }
2630
2631 /**
2632 * fas216_init_chip - Initialise FAS216 state after reset
2633 * @info: state structure for interface
2634 *
2635 * Initialise FAS216 state after reset
2636 */
fas216_init_chip(FAS216_Info * info)2637 static void fas216_init_chip(FAS216_Info *info)
2638 {
2639 unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7;
2640 fas216_writeb(info, REG_CLKF, clock);
2641 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2642 fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]);
2643 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2644 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
2645 fas216_writeb(info, REG_SOF, 0);
2646 fas216_writeb(info, REG_STP, info->scsi.async_stp);
2647 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2648 }
2649
2650 /**
2651 * fas216_eh_host_reset - Reset the host associated with this command
2652 * @SCpnt: command specifing host to reset
2653 *
2654 * Reset the host associated with this command.
2655 * Returns: FAILED if unable to reset.
2656 * Notes: io_request_lock is taken, and irqs are disabled
2657 */
fas216_eh_host_reset(struct scsi_cmnd * SCpnt)2658 int fas216_eh_host_reset(struct scsi_cmnd *SCpnt)
2659 {
2660 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2661
2662 spin_lock_irq(info->host->host_lock);
2663
2664 fas216_checkmagic(info);
2665
2666 fas216_log(info, LOG_ERROR, "resetting host");
2667
2668 /*
2669 * Reset the SCSI chip.
2670 */
2671 fas216_cmd(info, CMD_RESETCHIP);
2672
2673 /*
2674 * Ugly ugly ugly!
2675 * We need to release the host_lock and enable
2676 * IRQs if we sleep, but we must relock and disable
2677 * IRQs after the sleep.
2678 */
2679 spin_unlock_irq(info->host->host_lock);
2680 msleep(50 * 1000/100);
2681 spin_lock_irq(info->host->host_lock);
2682
2683 /*
2684 * Release the SCSI reset.
2685 */
2686 fas216_cmd(info, CMD_NOP);
2687
2688 fas216_init_chip(info);
2689
2690 spin_unlock_irq(info->host->host_lock);
2691 return SUCCESS;
2692 }
2693
2694 #define TYPE_UNKNOWN 0
2695 #define TYPE_NCR53C90 1
2696 #define TYPE_NCR53C90A 2
2697 #define TYPE_NCR53C9x 3
2698 #define TYPE_Am53CF94 4
2699 #define TYPE_EmFAS216 5
2700 #define TYPE_QLFAS216 6
2701
2702 static char *chip_types[] = {
2703 "unknown",
2704 "NS NCR53C90",
2705 "NS NCR53C90A",
2706 "NS NCR53C9x",
2707 "AMD Am53CF94",
2708 "Emulex FAS216",
2709 "QLogic FAS216"
2710 };
2711
fas216_detect_type(FAS216_Info * info)2712 static int fas216_detect_type(FAS216_Info *info)
2713 {
2714 int family, rev;
2715
2716 /*
2717 * Reset the chip.
2718 */
2719 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2720 udelay(50);
2721 fas216_writeb(info, REG_CMD, CMD_NOP);
2722
2723 /*
2724 * Check to see if control reg 2 is present.
2725 */
2726 fas216_writeb(info, REG_CNTL3, 0);
2727 fas216_writeb(info, REG_CNTL2, CNTL2_S2FE);
2728
2729 /*
2730 * If we are unable to read back control reg 2
2731 * correctly, it is not present, and we have a
2732 * NCR53C90.
2733 */
2734 if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE)
2735 return TYPE_NCR53C90;
2736
2737 /*
2738 * Now, check control register 3
2739 */
2740 fas216_writeb(info, REG_CNTL2, 0);
2741 fas216_writeb(info, REG_CNTL3, 0);
2742 fas216_writeb(info, REG_CNTL3, 5);
2743
2744 /*
2745 * If we are unable to read the register back
2746 * correctly, we have a NCR53C90A
2747 */
2748 if (fas216_readb(info, REG_CNTL3) != 5)
2749 return TYPE_NCR53C90A;
2750
2751 /*
2752 * Now read the ID from the chip.
2753 */
2754 fas216_writeb(info, REG_CNTL3, 0);
2755
2756 fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK);
2757 fas216_writeb(info, REG_CNTL3, 0);
2758
2759 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2760 udelay(50);
2761 fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP);
2762
2763 fas216_writeb(info, REG_CNTL2, CNTL2_ENF);
2764 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2765 udelay(50);
2766 fas216_writeb(info, REG_CMD, CMD_NOP);
2767
2768 rev = fas216_readb(info, REG_ID);
2769 family = rev >> 3;
2770 rev &= 7;
2771
2772 switch (family) {
2773 case 0x01:
2774 if (rev == 4)
2775 return TYPE_Am53CF94;
2776 break;
2777
2778 case 0x02:
2779 switch (rev) {
2780 case 2:
2781 return TYPE_EmFAS216;
2782 case 3:
2783 return TYPE_QLFAS216;
2784 }
2785 break;
2786
2787 default:
2788 break;
2789 }
2790 printk("family %x rev %x\n", family, rev);
2791 return TYPE_NCR53C9x;
2792 }
2793
2794 /**
2795 * fas216_reset_state - Initialise driver internal state
2796 * @info: state to initialise
2797 *
2798 * Initialise driver internal state
2799 */
fas216_reset_state(FAS216_Info * info)2800 static void fas216_reset_state(FAS216_Info *info)
2801 {
2802 int i;
2803
2804 fas216_checkmagic(info);
2805
2806 fas216_bus_reset(info);
2807
2808 /*
2809 * Clear out all stale info in our state structure
2810 */
2811 memset(info->busyluns, 0, sizeof(info->busyluns));
2812 info->scsi.disconnectable = 0;
2813 info->scsi.aborting = 0;
2814
2815 for (i = 0; i < 8; i++) {
2816 info->device[i].parity_enabled = 0;
2817 info->device[i].parity_check = 1;
2818 }
2819
2820 /*
2821 * Drain all commands on disconnected queue
2822 */
2823 while (queue_remove(&info->queues.disconnected) != NULL);
2824
2825 /*
2826 * Remove executing commands.
2827 */
2828 info->SCpnt = NULL;
2829 info->reqSCpnt = NULL;
2830 info->rstSCpnt = NULL;
2831 info->origSCpnt = NULL;
2832 }
2833
2834 /**
2835 * fas216_init - initialise FAS/NCR/AMD SCSI structures.
2836 * @host: a driver-specific filled-out structure
2837 *
2838 * Initialise FAS/NCR/AMD SCSI structures.
2839 * Returns: 0 on success
2840 */
fas216_init(struct Scsi_Host * host)2841 int fas216_init(struct Scsi_Host *host)
2842 {
2843 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2844
2845 info->magic_start = MAGIC;
2846 info->magic_end = MAGIC;
2847 info->host = host;
2848 info->scsi.cfg[0] = host->this_id | CNTL1_PERE;
2849 info->scsi.cfg[1] = CNTL2_ENF | CNTL2_S2FE;
2850 info->scsi.cfg[2] = info->ifcfg.cntl3 |
2851 CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM;
2852 info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod);
2853
2854 info->rst_dev_status = -1;
2855 info->rst_bus_status = -1;
2856 init_waitqueue_head(&info->eh_wait);
2857 timer_setup(&info->eh_timer, fas216_eh_timer, 0);
2858
2859 spin_lock_init(&info->host_lock);
2860
2861 memset(&info->stats, 0, sizeof(info->stats));
2862
2863 msgqueue_initialise(&info->scsi.msgs);
2864
2865 if (!queue_initialise(&info->queues.issue))
2866 return -ENOMEM;
2867
2868 if (!queue_initialise(&info->queues.disconnected)) {
2869 queue_free(&info->queues.issue);
2870 return -ENOMEM;
2871 }
2872
2873 return 0;
2874 }
2875
2876 /**
2877 * fas216_add - initialise FAS/NCR/AMD SCSI ic.
2878 * @host: a driver-specific filled-out structure
2879 * @dev: parent device
2880 *
2881 * Initialise FAS/NCR/AMD SCSI ic.
2882 * Returns: 0 on success
2883 */
fas216_add(struct Scsi_Host * host,struct device * dev)2884 int fas216_add(struct Scsi_Host *host, struct device *dev)
2885 {
2886 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2887 int type, ret;
2888
2889 if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) {
2890 printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n",
2891 info->ifcfg.clockrate);
2892 return -EINVAL;
2893 }
2894
2895 fas216_reset_state(info);
2896 type = fas216_detect_type(info);
2897 info->scsi.type = chip_types[type];
2898
2899 udelay(300);
2900
2901 /*
2902 * Initialise the chip correctly.
2903 */
2904 fas216_init_chip(info);
2905
2906 /*
2907 * Reset the SCSI bus. We don't want to see
2908 * the resulting reset interrupt, so mask it
2909 * out.
2910 */
2911 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR);
2912 fas216_writeb(info, REG_CMD, CMD_RESETSCSI);
2913
2914 /*
2915 * scsi standard says wait 250ms
2916 */
2917 spin_unlock_irq(info->host->host_lock);
2918 msleep(100*1000/100);
2919 spin_lock_irq(info->host->host_lock);
2920
2921 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2922 fas216_readb(info, REG_INST);
2923
2924 fas216_checkmagic(info);
2925
2926 ret = scsi_add_host(host, dev);
2927 if (ret)
2928 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2929 else
2930 scsi_scan_host(host);
2931
2932 return ret;
2933 }
2934
fas216_remove(struct Scsi_Host * host)2935 void fas216_remove(struct Scsi_Host *host)
2936 {
2937 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2938
2939 fas216_checkmagic(info);
2940 scsi_remove_host(host);
2941
2942 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2943 scsi_host_put(host);
2944 }
2945
2946 /**
2947 * fas216_release - release all resources for FAS/NCR/AMD SCSI ic.
2948 * @host: a driver-specific filled-out structure
2949 *
2950 * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic.
2951 */
fas216_release(struct Scsi_Host * host)2952 void fas216_release(struct Scsi_Host *host)
2953 {
2954 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2955
2956 queue_free(&info->queues.disconnected);
2957 queue_free(&info->queues.issue);
2958 }
2959
fas216_print_host(FAS216_Info * info,struct seq_file * m)2960 void fas216_print_host(FAS216_Info *info, struct seq_file *m)
2961 {
2962 seq_printf(m,
2963 "\n"
2964 "Chip : %s\n"
2965 " Address: 0x%p\n"
2966 " IRQ : %d\n"
2967 " DMA : %d\n",
2968 info->scsi.type, info->scsi.io_base,
2969 info->scsi.irq, info->scsi.dma);
2970 }
2971
fas216_print_stats(FAS216_Info * info,struct seq_file * m)2972 void fas216_print_stats(FAS216_Info *info, struct seq_file *m)
2973 {
2974 seq_printf(m, "\n"
2975 "Command Statistics:\n"
2976 " Queued : %u\n"
2977 " Issued : %u\n"
2978 " Completed : %u\n"
2979 " Reads : %u\n"
2980 " Writes : %u\n"
2981 " Others : %u\n"
2982 " Disconnects: %u\n"
2983 " Aborts : %u\n"
2984 " Bus resets : %u\n"
2985 " Host resets: %u\n",
2986 info->stats.queues, info->stats.removes,
2987 info->stats.fins, info->stats.reads,
2988 info->stats.writes, info->stats.miscs,
2989 info->stats.disconnects, info->stats.aborts,
2990 info->stats.bus_resets, info->stats.host_resets);
2991 }
2992
fas216_print_devices(FAS216_Info * info,struct seq_file * m)2993 void fas216_print_devices(FAS216_Info *info, struct seq_file *m)
2994 {
2995 struct fas216_device *dev;
2996 struct scsi_device *scd;
2997
2998 seq_puts(m, "Device/Lun TaggedQ Parity Sync\n");
2999
3000 shost_for_each_device(scd, info->host) {
3001 dev = &info->device[scd->id];
3002 seq_printf(m, " %d/%llu ", scd->id, scd->lun);
3003 if (scd->tagged_supported)
3004 seq_printf(m, "%3sabled(%3d) ",
3005 scd->simple_tags ? "en" : "dis",
3006 scd->current_tag);
3007 else
3008 seq_puts(m, "unsupported ");
3009
3010 seq_printf(m, "%3sabled ", dev->parity_enabled ? "en" : "dis");
3011
3012 if (dev->sof)
3013 seq_printf(m, "offset %d, %d ns\n",
3014 dev->sof, dev->period * 4);
3015 else
3016 seq_puts(m, "async\n");
3017 }
3018 }
3019
3020 EXPORT_SYMBOL(fas216_init);
3021 EXPORT_SYMBOL(fas216_add);
3022 EXPORT_SYMBOL(fas216_queue_command);
3023 EXPORT_SYMBOL(fas216_noqueue_command);
3024 EXPORT_SYMBOL(fas216_intr);
3025 EXPORT_SYMBOL(fas216_remove);
3026 EXPORT_SYMBOL(fas216_release);
3027 EXPORT_SYMBOL(fas216_eh_abort);
3028 EXPORT_SYMBOL(fas216_eh_device_reset);
3029 EXPORT_SYMBOL(fas216_eh_bus_reset);
3030 EXPORT_SYMBOL(fas216_eh_host_reset);
3031 EXPORT_SYMBOL(fas216_print_host);
3032 EXPORT_SYMBOL(fas216_print_stats);
3033 EXPORT_SYMBOL(fas216_print_devices);
3034
3035 MODULE_AUTHOR("Russell King");
3036 MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core");
3037 MODULE_LICENSE("GPL");
3038
