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
81 #undef DEBUG_CONNECT
82 #undef DEBUG_MESSAGES
83
84 #undef CHECK_STRUCTURE
85
86 #define LOG_CONNECT (1 << 0)
87 #define LOG_BUSSERVICE (1 << 1)
88 #define LOG_FUNCTIONDONE (1 << 2)
89 #define LOG_MESSAGES (1 << 3)
90 #define LOG_BUFFER (1 << 4)
91 #define LOG_ERROR (1 << 8)
92
93 static int level_mask = LOG_ERROR;
94
95 module_param(level_mask, int, 0644);
96
97 #ifndef MODULE
fas216_log_setup(char * str)98 static int __init fas216_log_setup(char *str)
99 {
100 char *s;
101
102 level_mask = 0;
103
104 while ((s = strsep(&str, ",")) != NULL) {
105 switch (s[0]) {
106 case 'a':
107 if (strcmp(s, "all") == 0)
108 level_mask |= -1;
109 break;
110 case 'b':
111 if (strncmp(s, "bus", 3) == 0)
112 level_mask |= LOG_BUSSERVICE;
113 if (strncmp(s, "buf", 3) == 0)
114 level_mask |= LOG_BUFFER;
115 break;
116 case 'c':
117 level_mask |= LOG_CONNECT;
118 break;
119 case 'e':
120 level_mask |= LOG_ERROR;
121 break;
122 case 'm':
123 level_mask |= LOG_MESSAGES;
124 break;
125 case 'n':
126 if (strcmp(s, "none") == 0)
127 level_mask = 0;
128 break;
129 case 's':
130 level_mask |= LOG_FUNCTIONDONE;
131 break;
132 }
133 }
134 return 1;
135 }
136
137 __setup("fas216_logging=", fas216_log_setup);
138 #endif
139
fas216_readb(FAS216_Info * info,unsigned int reg)140 static inline unsigned char fas216_readb(FAS216_Info *info, unsigned int reg)
141 {
142 unsigned int off = reg << info->scsi.io_shift;
143 return readb(info->scsi.io_base + off);
144 }
145
fas216_writeb(FAS216_Info * info,unsigned int reg,unsigned int val)146 static inline void fas216_writeb(FAS216_Info *info, unsigned int reg, unsigned int val)
147 {
148 unsigned int off = reg << info->scsi.io_shift;
149 writeb(val, info->scsi.io_base + off);
150 }
151
fas216_dumpstate(FAS216_Info * info)152 static void fas216_dumpstate(FAS216_Info *info)
153 {
154 unsigned char is, stat, inst;
155
156 is = fas216_readb(info, REG_IS);
157 stat = fas216_readb(info, REG_STAT);
158 inst = fas216_readb(info, REG_INST);
159
160 printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X"
161 " INST=%02X IS=%02X CFIS=%02X",
162 fas216_readb(info, REG_CTCL),
163 fas216_readb(info, REG_CTCM),
164 fas216_readb(info, REG_CMD), stat, inst, is,
165 fas216_readb(info, REG_CFIS));
166 printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n",
167 fas216_readb(info, REG_CNTL1),
168 fas216_readb(info, REG_CNTL2),
169 fas216_readb(info, REG_CNTL3),
170 fas216_readb(info, REG_CTCH));
171 }
172
print_SCp(struct scsi_pointer * SCp,const char * prefix,const char * suffix)173 static void print_SCp(struct scsi_pointer *SCp, const char *prefix, const char *suffix)
174 {
175 printk("%sptr %p this_residual 0x%x buffer %p buffers_residual 0x%x%s",
176 prefix, SCp->ptr, SCp->this_residual, SCp->buffer,
177 SCp->buffers_residual, suffix);
178 }
179
180 #ifdef CHECK_STRUCTURE
fas216_dumpinfo(FAS216_Info * info)181 static void fas216_dumpinfo(FAS216_Info *info)
182 {
183 static int used = 0;
184 int i;
185
186 if (used++)
187 return;
188
189 printk("FAS216_Info=\n");
190 printk(" { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p\n",
191 info->magic_start, info->host, info->SCpnt,
192 info->origSCpnt);
193 printk(" scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }\n",
194 info->scsi.io_shift, info->scsi.irq,
195 info->scsi.cfg[0], info->scsi.cfg[1], info->scsi.cfg[2],
196 info->scsi.cfg[3]);
197 printk(" type=%p phase=%X\n",
198 info->scsi.type, info->scsi.phase);
199 print_SCp(&info->scsi.SCp, " SCp={ ", " }\n");
200 printk(" msgs async_stp=%X disconnectable=%d aborting=%d }\n",
201 info->scsi.async_stp,
202 info->scsi.disconnectable, info->scsi.aborting);
203 printk(" stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X\n"
204 " disconnects=%X aborts=%X bus_resets=%X host_resets=%X}\n",
205 info->stats.queues, info->stats.removes, info->stats.fins,
206 info->stats.reads, info->stats.writes, info->stats.miscs,
207 info->stats.disconnects, info->stats.aborts, info->stats.bus_resets,
208 info->stats.host_resets);
209 printk(" ifcfg={ clockrate=%X select_timeout=%X asyncperiod=%X sync_max_depth=%X }\n",
210 info->ifcfg.clockrate, info->ifcfg.select_timeout,
211 info->ifcfg.asyncperiod, info->ifcfg.sync_max_depth);
212 for (i = 0; i < 8; i++) {
213 printk(" busyluns[%d]=%08lx dev[%d]={ disconnect_ok=%d stp=%X sof=%X sync_state=%X }\n",
214 i, info->busyluns[i], i,
215 info->device[i].disconnect_ok, info->device[i].stp,
216 info->device[i].sof, info->device[i].sync_state);
217 }
218 printk(" dma={ transfer_type=%X setup=%p pseudo=%p stop=%p }\n",
219 info->dma.transfer_type, info->dma.setup,
220 info->dma.pseudo, info->dma.stop);
221 printk(" internal_done=%X magic_end=%lX }\n",
222 info->internal_done, info->magic_end);
223 }
224
__fas216_checkmagic(FAS216_Info * info,const char * func)225 static void __fas216_checkmagic(FAS216_Info *info, const char *func)
226 {
227 int corruption = 0;
228 if (info->magic_start != MAGIC) {
229 printk(KERN_CRIT "FAS216 Error: magic at start corrupted\n");
230 corruption++;
231 }
232 if (info->magic_end != MAGIC) {
233 printk(KERN_CRIT "FAS216 Error: magic at end corrupted\n");
234 corruption++;
235 }
236 if (corruption) {
237 fas216_dumpinfo(info);
238 panic("scsi memory space corrupted in %s", func);
239 }
240 }
241 #define fas216_checkmagic(info) __fas216_checkmagic((info), __func__)
242 #else
243 #define fas216_checkmagic(info)
244 #endif
245
fas216_bus_phase(int stat)246 static const char *fas216_bus_phase(int stat)
247 {
248 static const char *phases[] = {
249 "DATA OUT", "DATA IN",
250 "COMMAND", "STATUS",
251 "MISC OUT", "MISC IN",
252 "MESG OUT", "MESG IN"
253 };
254
255 return phases[stat & STAT_BUSMASK];
256 }
257
fas216_drv_phase(FAS216_Info * info)258 static const char *fas216_drv_phase(FAS216_Info *info)
259 {
260 static const char *phases[] = {
261 [PHASE_IDLE] = "idle",
262 [PHASE_SELECTION] = "selection",
263 [PHASE_COMMAND] = "command",
264 [PHASE_DATAOUT] = "data out",
265 [PHASE_DATAIN] = "data in",
266 [PHASE_MSGIN] = "message in",
267 [PHASE_MSGIN_DISCONNECT]= "disconnect",
268 [PHASE_MSGOUT_EXPECT] = "expect message out",
269 [PHASE_MSGOUT] = "message out",
270 [PHASE_STATUS] = "status",
271 [PHASE_DONE] = "done",
272 };
273
274 if (info->scsi.phase < ARRAY_SIZE(phases) &&
275 phases[info->scsi.phase])
276 return phases[info->scsi.phase];
277 return "???";
278 }
279
fas216_target(FAS216_Info * info)280 static char fas216_target(FAS216_Info *info)
281 {
282 if (info->SCpnt)
283 return '0' + info->SCpnt->device->id;
284 else
285 return 'H';
286 }
287
288 static void
fas216_do_log(FAS216_Info * info,char target,char * fmt,va_list ap)289 fas216_do_log(FAS216_Info *info, char target, char *fmt, va_list ap)
290 {
291 static char buf[1024];
292
293 vsnprintf(buf, sizeof(buf), fmt, ap);
294 printk("scsi%d.%c: %s", info->host->host_no, target, buf);
295 }
296
fas216_log_command(FAS216_Info * info,int level,struct scsi_cmnd * SCpnt,char * fmt,...)297 static void fas216_log_command(FAS216_Info *info, int level,
298 struct scsi_cmnd *SCpnt, char *fmt, ...)
299 {
300 va_list args;
301
302 if (level != 0 && !(level & level_mask))
303 return;
304
305 va_start(args, fmt);
306 fas216_do_log(info, '0' + SCpnt->device->id, fmt, args);
307 va_end(args);
308
309 scsi_print_command(SCpnt);
310 }
311
312 static void
fas216_log_target(FAS216_Info * info,int level,int target,char * fmt,...)313 fas216_log_target(FAS216_Info *info, int level, int target, char *fmt, ...)
314 {
315 va_list args;
316
317 if (level != 0 && !(level & level_mask))
318 return;
319
320 if (target < 0)
321 target = 'H';
322 else
323 target += '0';
324
325 va_start(args, fmt);
326 fas216_do_log(info, target, fmt, args);
327 va_end(args);
328
329 printk("\n");
330 }
331
fas216_log(FAS216_Info * info,int level,char * fmt,...)332 static void fas216_log(FAS216_Info *info, int level, char *fmt, ...)
333 {
334 va_list args;
335
336 if (level != 0 && !(level & level_mask))
337 return;
338
339 va_start(args, fmt);
340 fas216_do_log(info, fas216_target(info), fmt, args);
341 va_end(args);
342
343 printk("\n");
344 }
345
346 #define PH_SIZE 32
347
348 static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE];
349 static int ph_ptr;
350
add_debug_list(int stat,int ssr,int isr,int ph)351 static void add_debug_list(int stat, int ssr, int isr, int ph)
352 {
353 ph_list[ph_ptr].stat = stat;
354 ph_list[ph_ptr].ssr = ssr;
355 ph_list[ph_ptr].isr = isr;
356 ph_list[ph_ptr].ph = ph;
357
358 ph_ptr = (ph_ptr + 1) & (PH_SIZE-1);
359 }
360
361 static struct { int command; void *from; } cmd_list[8];
362 static int cmd_ptr;
363
fas216_cmd(FAS216_Info * info,unsigned int command)364 static void fas216_cmd(FAS216_Info *info, unsigned int command)
365 {
366 cmd_list[cmd_ptr].command = command;
367 cmd_list[cmd_ptr].from = __builtin_return_address(0);
368
369 cmd_ptr = (cmd_ptr + 1) & 7;
370
371 fas216_writeb(info, REG_CMD, command);
372 }
373
print_debug_list(void)374 static void print_debug_list(void)
375 {
376 int i;
377
378 i = ph_ptr;
379
380 printk(KERN_ERR "SCSI IRQ trail\n");
381 do {
382 printk(" %02x:%02x:%02x:%1x",
383 ph_list[i].stat, ph_list[i].ssr,
384 ph_list[i].isr, ph_list[i].ph);
385 i = (i + 1) & (PH_SIZE - 1);
386 if (((i ^ ph_ptr) & 7) == 0)
387 printk("\n");
388 } while (i != ph_ptr);
389 if ((i ^ ph_ptr) & 7)
390 printk("\n");
391
392 i = cmd_ptr;
393 printk(KERN_ERR "FAS216 commands: ");
394 do {
395 printk("%02x:%p ", cmd_list[i].command, cmd_list[i].from);
396 i = (i + 1) & 7;
397 } while (i != cmd_ptr);
398 printk("\n");
399 }
400
401 static void fas216_done(FAS216_Info *info, unsigned int result);
402
403 /**
404 * fas216_get_last_msg - retrive last message from the list
405 * @info: interface to search
406 * @pos: current fifo position
407 *
408 * Retrieve a last message from the list, using position in fifo.
409 */
410 static inline unsigned short
fas216_get_last_msg(FAS216_Info * info,int pos)411 fas216_get_last_msg(FAS216_Info *info, int pos)
412 {
413 unsigned short packed_msg = NOP;
414 struct message *msg;
415 int msgnr = 0;
416
417 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
418 if (pos >= msg->fifo)
419 break;
420 }
421
422 if (msg) {
423 if (msg->msg[0] == EXTENDED_MESSAGE)
424 packed_msg = EXTENDED_MESSAGE | msg->msg[2] << 8;
425 else
426 packed_msg = msg->msg[0];
427 }
428
429 fas216_log(info, LOG_MESSAGES,
430 "Message: %04x found at position %02x\n", packed_msg, pos);
431
432 return packed_msg;
433 }
434
435 /**
436 * fas216_syncperiod - calculate STP register value
437 * @info: state structure for interface connected to device
438 * @ns: period in ns (between subsequent bytes)
439 *
440 * Calculate value to be loaded into the STP register for a given period
441 * in ns. Returns a value suitable for REG_STP.
442 */
fas216_syncperiod(FAS216_Info * info,int ns)443 static int fas216_syncperiod(FAS216_Info *info, int ns)
444 {
445 int value = (info->ifcfg.clockrate * ns) / 1000;
446
447 fas216_checkmagic(info);
448
449 if (value < 4)
450 value = 4;
451 else if (value > 35)
452 value = 35;
453
454 return value & 31;
455 }
456
457 /**
458 * fas216_set_sync - setup FAS216 chip for specified transfer period.
459 * @info: state structure for interface connected to device
460 * @target: target
461 *
462 * Correctly setup FAS216 chip for specified transfer period.
463 * Notes : we need to switch the chip out of FASTSCSI mode if we have
464 * a transfer period >= 200ns - otherwise the chip will violate
465 * the SCSI timings.
466 */
fas216_set_sync(FAS216_Info * info,int target)467 static void fas216_set_sync(FAS216_Info *info, int target)
468 {
469 unsigned int cntl3;
470
471 fas216_writeb(info, REG_SOF, info->device[target].sof);
472 fas216_writeb(info, REG_STP, info->device[target].stp);
473
474 cntl3 = info->scsi.cfg[2];
475 if (info->device[target].period >= (200 / 4))
476 cntl3 = cntl3 & ~CNTL3_FASTSCSI;
477
478 fas216_writeb(info, REG_CNTL3, cntl3);
479 }
480
481 /* Synchronous transfer support
482 *
483 * Note: The SCSI II r10 spec says (5.6.12):
484 *
485 * (2) Due to historical problems with early host adapters that could
486 * not accept an SDTR message, some targets may not initiate synchronous
487 * negotiation after a power cycle as required by this standard. Host
488 * adapters that support synchronous mode may avoid the ensuing failure
489 * modes when the target is independently power cycled by initiating a
490 * synchronous negotiation on each REQUEST SENSE and INQUIRY command.
491 * This approach increases the SCSI bus overhead and is not recommended
492 * for new implementations. The correct method is to respond to an
493 * SDTR message with a MESSAGE REJECT message if the either the
494 * initiator or target devices does not support synchronous transfers
495 * or does not want to negotiate for synchronous transfers at the time.
496 * Using the correct method assures compatibility with wide data
497 * transfers and future enhancements.
498 *
499 * We will always initiate a synchronous transfer negotiation request on
500 * every INQUIRY or REQUEST SENSE message, unless the target itself has
501 * at some point performed a synchronous transfer negotiation request, or
502 * we have synchronous transfers disabled for this device.
503 */
504
505 /**
506 * fas216_handlesync - Handle a synchronous transfer message
507 * @info: state structure for interface
508 * @msg: message from target
509 *
510 * Handle a synchronous transfer message from the target
511 */
fas216_handlesync(FAS216_Info * info,char * msg)512 static void fas216_handlesync(FAS216_Info *info, char *msg)
513 {
514 struct fas216_device *dev = &info->device[info->SCpnt->device->id];
515 enum { sync, async, none, reject } res = none;
516
517 #ifdef SCSI2_SYNC
518 switch (msg[0]) {
519 case MESSAGE_REJECT:
520 /* Synchronous transfer request failed.
521 * Note: SCSI II r10:
522 *
523 * SCSI devices that are capable of synchronous
524 * data transfers shall not respond to an SDTR
525 * message with a MESSAGE REJECT message.
526 *
527 * Hence, if we get this condition, we disable
528 * negotiation for this device.
529 */
530 if (dev->sync_state == neg_inprogress) {
531 dev->sync_state = neg_invalid;
532 res = async;
533 }
534 break;
535
536 case EXTENDED_MESSAGE:
537 switch (dev->sync_state) {
538 /* We don't accept synchronous transfer requests.
539 * Respond with a MESSAGE_REJECT to prevent a
540 * synchronous transfer agreement from being reached.
541 */
542 case neg_invalid:
543 res = reject;
544 break;
545
546 /* We were not negotiating a synchronous transfer,
547 * but the device sent us a negotiation request.
548 * Honour the request by sending back a SDTR
549 * message containing our capability, limited by
550 * the targets capability.
551 */
552 default:
553 fas216_cmd(info, CMD_SETATN);
554 if (msg[4] > info->ifcfg.sync_max_depth)
555 msg[4] = info->ifcfg.sync_max_depth;
556 if (msg[3] < 1000 / info->ifcfg.clockrate)
557 msg[3] = 1000 / info->ifcfg.clockrate;
558
559 msgqueue_flush(&info->scsi.msgs);
560 msgqueue_addmsg(&info->scsi.msgs, 5,
561 EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
562 msg[3], msg[4]);
563 info->scsi.phase = PHASE_MSGOUT_EXPECT;
564
565 /* This is wrong. The agreement is not in effect
566 * until this message is accepted by the device
567 */
568 dev->sync_state = neg_targcomplete;
569 res = sync;
570 break;
571
572 /* We initiated the synchronous transfer negotiation,
573 * and have successfully received a response from the
574 * target. The synchronous transfer agreement has been
575 * reached. Note: if the values returned are out of our
576 * bounds, we must reject the message.
577 */
578 case neg_inprogress:
579 res = reject;
580 if (msg[4] <= info->ifcfg.sync_max_depth &&
581 msg[3] >= 1000 / info->ifcfg.clockrate) {
582 dev->sync_state = neg_complete;
583 res = sync;
584 }
585 break;
586 }
587 }
588 #else
589 res = reject;
590 #endif
591
592 switch (res) {
593 case sync:
594 dev->period = msg[3];
595 dev->sof = msg[4];
596 dev->stp = fas216_syncperiod(info, msg[3] * 4);
597 fas216_set_sync(info, info->SCpnt->device->id);
598 break;
599
600 case reject:
601 fas216_cmd(info, CMD_SETATN);
602 msgqueue_flush(&info->scsi.msgs);
603 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
604 info->scsi.phase = PHASE_MSGOUT_EXPECT;
605 fallthrough;
606
607 case async:
608 dev->period = info->ifcfg.asyncperiod / 4;
609 dev->sof = 0;
610 dev->stp = info->scsi.async_stp;
611 fas216_set_sync(info, info->SCpnt->device->id);
612 break;
613
614 case none:
615 break;
616 }
617 }
618
619 /**
620 * fas216_updateptrs - update data pointers after transfer suspended/paused
621 * @info: interface's local pointer to update
622 * @bytes_transferred: number of bytes transferred
623 *
624 * Update data pointers after transfer suspended/paused
625 */
fas216_updateptrs(FAS216_Info * info,int bytes_transferred)626 static void fas216_updateptrs(FAS216_Info *info, int bytes_transferred)
627 {
628 struct scsi_pointer *SCp = &info->scsi.SCp;
629
630 fas216_checkmagic(info);
631
632 BUG_ON(bytes_transferred < 0);
633
634 SCp->phase -= bytes_transferred;
635
636 while (bytes_transferred != 0) {
637 if (SCp->this_residual > bytes_transferred)
638 break;
639 /*
640 * We have used up this buffer. Move on to the
641 * next buffer.
642 */
643 bytes_transferred -= SCp->this_residual;
644 if (!next_SCp(SCp) && bytes_transferred) {
645 printk(KERN_WARNING "scsi%d.%c: out of buffers\n",
646 info->host->host_no, '0' + info->SCpnt->device->id);
647 return;
648 }
649 }
650
651 SCp->this_residual -= bytes_transferred;
652 if (SCp->this_residual)
653 SCp->ptr += bytes_transferred;
654 else
655 SCp->ptr = NULL;
656 }
657
658 /**
659 * fas216_pio - transfer data off of/on to card using programmed IO
660 * @info: interface to transfer data to/from
661 * @direction: direction to transfer data (DMA_OUT/DMA_IN)
662 *
663 * Transfer data off of/on to card using programmed IO.
664 * Notes: this is incredibly slow.
665 */
fas216_pio(FAS216_Info * info,fasdmadir_t direction)666 static void fas216_pio(FAS216_Info *info, fasdmadir_t direction)
667 {
668 struct scsi_pointer *SCp = &info->scsi.SCp;
669
670 fas216_checkmagic(info);
671
672 if (direction == DMA_OUT)
673 fas216_writeb(info, REG_FF, get_next_SCp_byte(SCp));
674 else
675 put_next_SCp_byte(SCp, fas216_readb(info, REG_FF));
676
677 if (SCp->this_residual == 0)
678 next_SCp(SCp);
679 }
680
fas216_set_stc(FAS216_Info * info,unsigned int length)681 static void fas216_set_stc(FAS216_Info *info, unsigned int length)
682 {
683 fas216_writeb(info, REG_STCL, length);
684 fas216_writeb(info, REG_STCM, length >> 8);
685 fas216_writeb(info, REG_STCH, length >> 16);
686 }
687
fas216_get_ctc(FAS216_Info * info)688 static unsigned int fas216_get_ctc(FAS216_Info *info)
689 {
690 return fas216_readb(info, REG_CTCL) +
691 (fas216_readb(info, REG_CTCM) << 8) +
692 (fas216_readb(info, REG_CTCH) << 16);
693 }
694
695 /**
696 * fas216_cleanuptransfer - clean up after a transfer has completed.
697 * @info: interface to clean up
698 *
699 * Update the data pointers according to the number of bytes transferred
700 * on the SCSI bus.
701 */
fas216_cleanuptransfer(FAS216_Info * info)702 static void fas216_cleanuptransfer(FAS216_Info *info)
703 {
704 unsigned long total, residual, fifo;
705 fasdmatype_t dmatype = info->dma.transfer_type;
706
707 info->dma.transfer_type = fasdma_none;
708
709 /*
710 * PIO transfers do not need to be cleaned up.
711 */
712 if (dmatype == fasdma_pio || dmatype == fasdma_none)
713 return;
714
715 if (dmatype == fasdma_real_all)
716 total = info->scsi.SCp.phase;
717 else
718 total = info->scsi.SCp.this_residual;
719
720 residual = fas216_get_ctc(info);
721
722 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
723
724 fas216_log(info, LOG_BUFFER, "cleaning up from previous "
725 "transfer: length 0x%06x, residual 0x%x, fifo %d",
726 total, residual, fifo);
727
728 /*
729 * If we were performing Data-Out, the transfer counter
730 * counts down each time a byte is transferred by the
731 * host to the FIFO. This means we must include the
732 * bytes left in the FIFO from the transfer counter.
733 */
734 if (info->scsi.phase == PHASE_DATAOUT)
735 residual += fifo;
736
737 fas216_updateptrs(info, total - residual);
738 }
739
740 /**
741 * fas216_transfer - Perform a DMA/PIO transfer off of/on to card
742 * @info: interface from which device disconnected from
743 *
744 * Start a DMA/PIO transfer off of/on to card
745 */
fas216_transfer(FAS216_Info * info)746 static void fas216_transfer(FAS216_Info *info)
747 {
748 fasdmadir_t direction;
749 fasdmatype_t dmatype;
750
751 fas216_log(info, LOG_BUFFER,
752 "starttransfer: buffer %p length 0x%06x reqlen 0x%06x",
753 info->scsi.SCp.ptr, info->scsi.SCp.this_residual,
754 info->scsi.SCp.phase);
755
756 if (!info->scsi.SCp.ptr) {
757 fas216_log(info, LOG_ERROR, "null buffer passed to "
758 "fas216_starttransfer");
759 print_SCp(&info->scsi.SCp, "SCp: ", "\n");
760 print_SCp(&info->SCpnt->SCp, "Cmnd SCp: ", "\n");
761 return;
762 }
763
764 /*
765 * If we have a synchronous transfer agreement in effect, we must
766 * use DMA mode. If we are using asynchronous transfers, we may
767 * use DMA mode or PIO mode.
768 */
769 if (info->device[info->SCpnt->device->id].sof)
770 dmatype = fasdma_real_all;
771 else
772 dmatype = fasdma_pio;
773
774 if (info->scsi.phase == PHASE_DATAOUT)
775 direction = DMA_OUT;
776 else
777 direction = DMA_IN;
778
779 if (info->dma.setup)
780 dmatype = info->dma.setup(info->host, &info->scsi.SCp,
781 direction, dmatype);
782 info->dma.transfer_type = dmatype;
783
784 if (dmatype == fasdma_real_all)
785 fas216_set_stc(info, info->scsi.SCp.phase);
786 else
787 fas216_set_stc(info, info->scsi.SCp.this_residual);
788
789 switch (dmatype) {
790 case fasdma_pio:
791 fas216_log(info, LOG_BUFFER, "PIO transfer");
792 fas216_writeb(info, REG_SOF, 0);
793 fas216_writeb(info, REG_STP, info->scsi.async_stp);
794 fas216_cmd(info, CMD_TRANSFERINFO);
795 fas216_pio(info, direction);
796 break;
797
798 case fasdma_pseudo:
799 fas216_log(info, LOG_BUFFER, "pseudo transfer");
800 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
801 info->dma.pseudo(info->host, &info->scsi.SCp,
802 direction, info->SCpnt->transfersize);
803 break;
804
805 case fasdma_real_block:
806 fas216_log(info, LOG_BUFFER, "block dma transfer");
807 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
808 break;
809
810 case fasdma_real_all:
811 fas216_log(info, LOG_BUFFER, "total dma transfer");
812 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
813 break;
814
815 default:
816 fas216_log(info, LOG_BUFFER | LOG_ERROR,
817 "invalid FAS216 DMA type");
818 break;
819 }
820 }
821
822 /**
823 * fas216_stoptransfer - Stop a DMA transfer onto / off of the card
824 * @info: interface from which device disconnected from
825 *
826 * Called when we switch away from DATA IN or DATA OUT phases.
827 */
fas216_stoptransfer(FAS216_Info * info)828 static void fas216_stoptransfer(FAS216_Info *info)
829 {
830 fas216_checkmagic(info);
831
832 if (info->dma.transfer_type == fasdma_real_all ||
833 info->dma.transfer_type == fasdma_real_block)
834 info->dma.stop(info->host, &info->scsi.SCp);
835
836 fas216_cleanuptransfer(info);
837
838 if (info->scsi.phase == PHASE_DATAIN) {
839 unsigned int fifo;
840
841 /*
842 * If we were performing Data-In, then the FIFO counter
843 * contains the number of bytes not transferred via DMA
844 * from the on-board FIFO. Read them manually.
845 */
846 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
847 while (fifo && info->scsi.SCp.ptr) {
848 *info->scsi.SCp.ptr = fas216_readb(info, REG_FF);
849 fas216_updateptrs(info, 1);
850 fifo--;
851 }
852 } else {
853 /*
854 * After a Data-Out phase, there may be unsent
855 * bytes left in the FIFO. Flush them out.
856 */
857 fas216_cmd(info, CMD_FLUSHFIFO);
858 }
859 }
860
fas216_aborttransfer(FAS216_Info * info)861 static void fas216_aborttransfer(FAS216_Info *info)
862 {
863 fas216_checkmagic(info);
864
865 if (info->dma.transfer_type == fasdma_real_all ||
866 info->dma.transfer_type == fasdma_real_block)
867 info->dma.stop(info->host, &info->scsi.SCp);
868
869 info->dma.transfer_type = fasdma_none;
870 fas216_cmd(info, CMD_FLUSHFIFO);
871 }
872
873 static void fas216_kick(FAS216_Info *info);
874
875 /**
876 * fas216_disconnected_intr - handle device disconnection
877 * @info: interface from which device disconnected from
878 *
879 * Handle device disconnection
880 */
fas216_disconnect_intr(FAS216_Info * info)881 static void fas216_disconnect_intr(FAS216_Info *info)
882 {
883 unsigned long flags;
884
885 fas216_checkmagic(info);
886
887 fas216_log(info, LOG_CONNECT, "disconnect phase=%02x",
888 info->scsi.phase);
889
890 msgqueue_flush(&info->scsi.msgs);
891
892 switch (info->scsi.phase) {
893 case PHASE_SELECTION: /* while selecting - no target */
894 case PHASE_SELSTEPS:
895 fas216_done(info, DID_NO_CONNECT);
896 break;
897
898 case PHASE_MSGIN_DISCONNECT: /* message in - disconnecting */
899 info->scsi.disconnectable = 1;
900 info->scsi.phase = PHASE_IDLE;
901 info->stats.disconnects += 1;
902 spin_lock_irqsave(&info->host_lock, flags);
903 if (info->scsi.phase == PHASE_IDLE)
904 fas216_kick(info);
905 spin_unlock_irqrestore(&info->host_lock, flags);
906 break;
907
908 case PHASE_DONE: /* at end of command - complete */
909 fas216_done(info, DID_OK);
910 break;
911
912 case PHASE_MSGOUT: /* message out - possible ABORT message */
913 if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) {
914 info->scsi.aborting = 0;
915 fas216_done(info, DID_ABORT);
916 break;
917 }
918 fallthrough;
919
920 default: /* huh? */
921 printk(KERN_ERR "scsi%d.%c: unexpected disconnect in phase %s\n",
922 info->host->host_no, fas216_target(info), fas216_drv_phase(info));
923 print_debug_list();
924 fas216_stoptransfer(info);
925 fas216_done(info, DID_ERROR);
926 break;
927 }
928 }
929
930 /**
931 * fas216_reselected_intr - start reconnection of a device
932 * @info: interface which was reselected
933 *
934 * Start reconnection of a device
935 */
936 static void
fas216_reselected_intr(FAS216_Info * info)937 fas216_reselected_intr(FAS216_Info *info)
938 {
939 unsigned int cfis, i;
940 unsigned char msg[4];
941 unsigned char target, lun, tag;
942
943 fas216_checkmagic(info);
944
945 WARN_ON(info->scsi.phase == PHASE_SELECTION ||
946 info->scsi.phase == PHASE_SELSTEPS);
947
948 cfis = fas216_readb(info, REG_CFIS);
949
950 fas216_log(info, LOG_CONNECT, "reconnect phase=%02x cfis=%02x",
951 info->scsi.phase, cfis);
952
953 cfis &= CFIS_CF;
954
955 if (cfis < 2 || cfis > 4) {
956 printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n",
957 info->host->host_no);
958 goto bad_message;
959 }
960
961 for (i = 0; i < cfis; i++)
962 msg[i] = fas216_readb(info, REG_FF);
963
964 if (!(msg[0] & (1 << info->host->this_id)) ||
965 !(msg[1] & 0x80))
966 goto initiator_error;
967
968 target = msg[0] & ~(1 << info->host->this_id);
969 target = ffs(target) - 1;
970 lun = msg[1] & 7;
971 tag = 0;
972
973 if (cfis >= 3) {
974 if (msg[2] != SIMPLE_QUEUE_TAG)
975 goto initiator_error;
976
977 tag = msg[3];
978 }
979
980 /* set up for synchronous transfers */
981 fas216_writeb(info, REG_SDID, target);
982 fas216_set_sync(info, target);
983 msgqueue_flush(&info->scsi.msgs);
984
985 fas216_log(info, LOG_CONNECT, "Reconnected: target %1x lun %1x tag %02x",
986 target, lun, tag);
987
988 if (info->scsi.disconnectable && info->SCpnt) {
989 info->scsi.disconnectable = 0;
990 if (info->SCpnt->device->id == target &&
991 info->SCpnt->device->lun == lun &&
992 scsi_cmd_to_rq(info->SCpnt)->tag == tag) {
993 fas216_log(info, LOG_CONNECT, "reconnected previously executing command");
994 } else {
995 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
996 fas216_log(info, LOG_CONNECT, "had to move command to disconnected queue");
997 info->SCpnt = NULL;
998 }
999 }
1000 if (!info->SCpnt) {
1001 info->SCpnt = queue_remove_tgtluntag(&info->queues.disconnected,
1002 target, lun, tag);
1003 fas216_log(info, LOG_CONNECT, "had to get command");
1004 }
1005
1006 if (info->SCpnt) {
1007 /*
1008 * Restore data pointer from SAVED data pointer
1009 */
1010 info->scsi.SCp = info->SCpnt->SCp;
1011
1012 fas216_log(info, LOG_CONNECT, "data pointers: [%p, %X]",
1013 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1014 info->scsi.phase = PHASE_MSGIN;
1015 } else {
1016 /*
1017 * Our command structure not found - abort the
1018 * command on the target. Since we have no
1019 * record of this command, we can't send
1020 * an INITIATOR DETECTED ERROR message.
1021 */
1022 fas216_cmd(info, CMD_SETATN);
1023
1024 #if 0
1025 if (tag)
1026 msgqueue_addmsg(&info->scsi.msgs, 2, ABORT_TAG, tag);
1027 else
1028 #endif
1029 msgqueue_addmsg(&info->scsi.msgs, 1, ABORT);
1030 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1031 info->scsi.aborting = 1;
1032 }
1033
1034 fas216_cmd(info, CMD_MSGACCEPTED);
1035 return;
1036
1037 initiator_error:
1038 printk(KERN_ERR "scsi%d.H: error during reselection: bytes",
1039 info->host->host_no);
1040 for (i = 0; i < cfis; i++)
1041 printk(" %02x", msg[i]);
1042 printk("\n");
1043 bad_message:
1044 fas216_cmd(info, CMD_SETATN);
1045 msgqueue_flush(&info->scsi.msgs);
1046 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1047 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1048 fas216_cmd(info, CMD_MSGACCEPTED);
1049 }
1050
fas216_parse_message(FAS216_Info * info,unsigned char * message,int msglen)1051 static void fas216_parse_message(FAS216_Info *info, unsigned char *message, int msglen)
1052 {
1053 int i;
1054
1055 switch (message[0]) {
1056 case COMMAND_COMPLETE:
1057 if (msglen != 1)
1058 goto unrecognised;
1059
1060 printk(KERN_ERR "scsi%d.%c: command complete with no "
1061 "status in MESSAGE_IN?\n",
1062 info->host->host_no, fas216_target(info));
1063 break;
1064
1065 case SAVE_POINTERS:
1066 if (msglen != 1)
1067 goto unrecognised;
1068
1069 /*
1070 * Save current data pointer to SAVED data pointer
1071 * SCSI II standard says that we must not acknowledge
1072 * this until we have really saved pointers.
1073 * NOTE: we DO NOT save the command nor status pointers
1074 * as required by the SCSI II standard. These always
1075 * point to the start of their respective areas.
1076 */
1077 info->SCpnt->SCp = info->scsi.SCp;
1078 info->SCpnt->SCp.sent_command = 0;
1079 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
1080 "save data pointers: [%p, %X]",
1081 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1082 break;
1083
1084 case RESTORE_POINTERS:
1085 if (msglen != 1)
1086 goto unrecognised;
1087
1088 /*
1089 * Restore current data pointer from SAVED data pointer
1090 */
1091 info->scsi.SCp = info->SCpnt->SCp;
1092 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
1093 "restore data pointers: [%p, 0x%x]",
1094 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1095 break;
1096
1097 case DISCONNECT:
1098 if (msglen != 1)
1099 goto unrecognised;
1100
1101 info->scsi.phase = PHASE_MSGIN_DISCONNECT;
1102 break;
1103
1104 case MESSAGE_REJECT:
1105 if (msglen != 1)
1106 goto unrecognised;
1107
1108 switch (fas216_get_last_msg(info, info->scsi.msgin_fifo)) {
1109 case EXTENDED_MESSAGE | EXTENDED_SDTR << 8:
1110 fas216_handlesync(info, message);
1111 break;
1112
1113 default:
1114 fas216_log(info, 0, "reject, last message 0x%04x",
1115 fas216_get_last_msg(info, info->scsi.msgin_fifo));
1116 }
1117 break;
1118
1119 case NOP:
1120 break;
1121
1122 case EXTENDED_MESSAGE:
1123 if (msglen < 3)
1124 goto unrecognised;
1125
1126 switch (message[2]) {
1127 case EXTENDED_SDTR: /* Sync transfer negotiation request/reply */
1128 fas216_handlesync(info, message);
1129 break;
1130
1131 default:
1132 goto unrecognised;
1133 }
1134 break;
1135
1136 default:
1137 goto unrecognised;
1138 }
1139 return;
1140
1141 unrecognised:
1142 fas216_log(info, 0, "unrecognised message, rejecting");
1143 printk("scsi%d.%c: message was", info->host->host_no, fas216_target(info));
1144 for (i = 0; i < msglen; i++)
1145 printk("%s%02X", i & 31 ? " " : "\n ", message[i]);
1146 printk("\n");
1147
1148 /*
1149 * Something strange seems to be happening here -
1150 * I can't use SETATN since the chip gives me an
1151 * invalid command interrupt when I do. Weird.
1152 */
1153 fas216_cmd(info, CMD_NOP);
1154 fas216_dumpstate(info);
1155 fas216_cmd(info, CMD_SETATN);
1156 msgqueue_flush(&info->scsi.msgs);
1157 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
1158 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1159 fas216_dumpstate(info);
1160 }
1161
fas216_wait_cmd(FAS216_Info * info,int cmd)1162 static int fas216_wait_cmd(FAS216_Info *info, int cmd)
1163 {
1164 int tout;
1165 int stat;
1166
1167 fas216_cmd(info, cmd);
1168
1169 for (tout = 1000; tout; tout -= 1) {
1170 stat = fas216_readb(info, REG_STAT);
1171 if (stat & (STAT_INT|STAT_PARITYERROR))
1172 break;
1173 udelay(1);
1174 }
1175
1176 return stat;
1177 }
1178
fas216_get_msg_byte(FAS216_Info * info)1179 static int fas216_get_msg_byte(FAS216_Info *info)
1180 {
1181 unsigned int stat = fas216_wait_cmd(info, CMD_MSGACCEPTED);
1182
1183 if ((stat & STAT_INT) == 0)
1184 goto timedout;
1185
1186 if ((stat & STAT_BUSMASK) != STAT_MESGIN)
1187 goto unexpected_phase_change;
1188
1189 fas216_readb(info, REG_INST);
1190
1191 stat = fas216_wait_cmd(info, CMD_TRANSFERINFO);
1192
1193 if ((stat & STAT_INT) == 0)
1194 goto timedout;
1195
1196 if (stat & STAT_PARITYERROR)
1197 goto parity_error;
1198
1199 if ((stat & STAT_BUSMASK) != STAT_MESGIN)
1200 goto unexpected_phase_change;
1201
1202 fas216_readb(info, REG_INST);
1203
1204 return fas216_readb(info, REG_FF);
1205
1206 timedout:
1207 fas216_log(info, LOG_ERROR, "timed out waiting for message byte");
1208 return -1;
1209
1210 unexpected_phase_change:
1211 fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat);
1212 return -2;
1213
1214 parity_error:
1215 fas216_log(info, LOG_ERROR, "parity error during message in phase");
1216 return -3;
1217 }
1218
1219 /**
1220 * fas216_message - handle a function done interrupt from FAS216 chip
1221 * @info: interface which caused function done interrupt
1222 *
1223 * Handle a function done interrupt from FAS216 chip
1224 */
fas216_message(FAS216_Info * info)1225 static void fas216_message(FAS216_Info *info)
1226 {
1227 unsigned char *message = info->scsi.message;
1228 unsigned int msglen = 1;
1229 int msgbyte = 0;
1230
1231 fas216_checkmagic(info);
1232
1233 message[0] = fas216_readb(info, REG_FF);
1234
1235 if (message[0] == EXTENDED_MESSAGE) {
1236 msgbyte = fas216_get_msg_byte(info);
1237
1238 if (msgbyte >= 0) {
1239 message[1] = msgbyte;
1240
1241 for (msglen = 2; msglen < message[1] + 2; msglen++) {
1242 msgbyte = fas216_get_msg_byte(info);
1243
1244 if (msgbyte >= 0)
1245 message[msglen] = msgbyte;
1246 else
1247 break;
1248 }
1249 }
1250 }
1251
1252 if (msgbyte == -3)
1253 goto parity_error;
1254
1255 #ifdef DEBUG_MESSAGES
1256 {
1257 int i;
1258
1259 printk("scsi%d.%c: message in: ",
1260 info->host->host_no, fas216_target(info));
1261 for (i = 0; i < msglen; i++)
1262 printk("%02X ", message[i]);
1263 printk("\n");
1264 }
1265 #endif
1266
1267 fas216_parse_message(info, message, msglen);
1268 fas216_cmd(info, CMD_MSGACCEPTED);
1269 return;
1270
1271 parity_error:
1272 fas216_cmd(info, CMD_SETATN);
1273 msgqueue_flush(&info->scsi.msgs);
1274 msgqueue_addmsg(&info->scsi.msgs, 1, MSG_PARITY_ERROR);
1275 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1276 fas216_cmd(info, CMD_MSGACCEPTED);
1277 return;
1278 }
1279
1280 /**
1281 * fas216_send_command - send command after all message bytes have been sent
1282 * @info: interface which caused bus service
1283 *
1284 * Send a command to a target after all message bytes have been sent
1285 */
fas216_send_command(FAS216_Info * info)1286 static void fas216_send_command(FAS216_Info *info)
1287 {
1288 int i;
1289
1290 fas216_checkmagic(info);
1291
1292 fas216_cmd(info, CMD_NOP|CMD_WITHDMA);
1293 fas216_cmd(info, CMD_FLUSHFIFO);
1294
1295 /* load command */
1296 for (i = info->scsi.SCp.sent_command; i < info->SCpnt->cmd_len; i++)
1297 fas216_writeb(info, REG_FF, info->SCpnt->cmnd[i]);
1298
1299 fas216_cmd(info, CMD_TRANSFERINFO);
1300
1301 info->scsi.phase = PHASE_COMMAND;
1302 }
1303
1304 /**
1305 * fas216_send_messageout - handle bus service to send a message
1306 * @info: interface which caused bus service
1307 *
1308 * Handle bus service to send a message.
1309 * Note: We do not allow the device to change the data direction!
1310 */
fas216_send_messageout(FAS216_Info * info,int start)1311 static void fas216_send_messageout(FAS216_Info *info, int start)
1312 {
1313 unsigned int tot_msglen = msgqueue_msglength(&info->scsi.msgs);
1314
1315 fas216_checkmagic(info);
1316
1317 fas216_cmd(info, CMD_FLUSHFIFO);
1318
1319 if (tot_msglen) {
1320 struct message *msg;
1321 int msgnr = 0;
1322
1323 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1324 int i;
1325
1326 for (i = start; i < msg->length; i++)
1327 fas216_writeb(info, REG_FF, msg->msg[i]);
1328
1329 msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
1330 start = 0;
1331 }
1332 } else
1333 fas216_writeb(info, REG_FF, NOP);
1334
1335 fas216_cmd(info, CMD_TRANSFERINFO);
1336
1337 info->scsi.phase = PHASE_MSGOUT;
1338 }
1339
1340 /**
1341 * fas216_busservice_intr - handle bus service interrupt from FAS216 chip
1342 * @info: interface which caused bus service interrupt
1343 * @stat: Status register contents
1344 * @is: SCSI Status register contents
1345 *
1346 * Handle a bus service interrupt from FAS216 chip
1347 */
fas216_busservice_intr(FAS216_Info * info,unsigned int stat,unsigned int is)1348 static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
1349 {
1350 fas216_checkmagic(info);
1351
1352 fas216_log(info, LOG_BUSSERVICE,
1353 "bus service: stat=%02x is=%02x phase=%02x",
1354 stat, is, info->scsi.phase);
1355
1356 switch (info->scsi.phase) {
1357 case PHASE_SELECTION:
1358 if ((is & IS_BITS) != IS_MSGBYTESENT)
1359 goto bad_is;
1360 break;
1361
1362 case PHASE_SELSTEPS:
1363 switch (is & IS_BITS) {
1364 case IS_SELARB:
1365 case IS_MSGBYTESENT:
1366 goto bad_is;
1367
1368 case IS_NOTCOMMAND:
1369 case IS_EARLYPHASE:
1370 if ((stat & STAT_BUSMASK) == STAT_MESGIN)
1371 break;
1372 goto bad_is;
1373
1374 case IS_COMPLETE:
1375 break;
1376 }
1377 break;
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->device->simple_tags)
1794 msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG,
1795 scsi_cmd_to_rq(SCpnt)->tag);
1796
1797 do {
1798 #ifdef SCSI2_SYNC
1799 if ((info->device[SCpnt->device->id].sync_state == neg_wait ||
1800 info->device[SCpnt->device->id].sync_state == neg_complete) &&
1801 (SCpnt->cmnd[0] == REQUEST_SENSE ||
1802 SCpnt->cmnd[0] == INQUIRY)) {
1803 info->device[SCpnt->device->id].sync_state = neg_inprogress;
1804 msgqueue_addmsg(&info->scsi.msgs, 5,
1805 EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
1806 1000 / info->ifcfg.clockrate,
1807 info->ifcfg.sync_max_depth);
1808 break;
1809 }
1810 #endif
1811 } while (0);
1812
1813 __fas216_start_command(info, SCpnt);
1814 }
1815
fas216_allocate_tag(FAS216_Info * info,struct scsi_cmnd * SCpnt)1816 static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1817 {
1818 set_bit(SCpnt->device->id * 8 +
1819 (u8)(SCpnt->device->lun & 0x7), info->busyluns);
1820
1821 info->stats.removes += 1;
1822 switch (SCpnt->cmnd[0]) {
1823 case WRITE_6:
1824 case WRITE_10:
1825 case WRITE_12:
1826 info->stats.writes += 1;
1827 break;
1828 case READ_6:
1829 case READ_10:
1830 case READ_12:
1831 info->stats.reads += 1;
1832 break;
1833 default:
1834 info->stats.miscs += 1;
1835 break;
1836 }
1837 }
1838
fas216_do_bus_device_reset(FAS216_Info * info,struct scsi_cmnd * SCpnt)1839 static void fas216_do_bus_device_reset(FAS216_Info *info,
1840 struct scsi_cmnd *SCpnt)
1841 {
1842 struct message *msg;
1843
1844 /*
1845 * claim host busy
1846 */
1847 info->scsi.phase = PHASE_SELECTION;
1848 info->scsi.SCp = SCpnt->SCp;
1849 info->SCpnt = SCpnt;
1850 info->dma.transfer_type = fasdma_none;
1851
1852 fas216_log(info, LOG_ERROR, "sending bus device reset");
1853
1854 msgqueue_flush(&info->scsi.msgs);
1855 msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET);
1856
1857 /* following what the ESP driver says */
1858 fas216_set_stc(info, 0);
1859 fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1860
1861 /* flush FIFO */
1862 fas216_cmd(info, CMD_FLUSHFIFO);
1863
1864 /* load bus-id and timeout */
1865 fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1866 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1867
1868 /* synchronous transfers */
1869 fas216_set_sync(info, SCpnt->device->id);
1870
1871 msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1872
1873 fas216_writeb(info, REG_FF, BUS_DEVICE_RESET);
1874 msg->fifo = 1;
1875
1876 fas216_cmd(info, CMD_SELECTATNSTOP);
1877 }
1878
1879 /**
1880 * fas216_kick - kick a command to the interface
1881 * @info: our host interface to kick
1882 *
1883 * Kick a command to the interface, interface should be idle.
1884 * Notes: Interrupts are always disabled!
1885 */
fas216_kick(FAS216_Info * info)1886 static void fas216_kick(FAS216_Info *info)
1887 {
1888 struct scsi_cmnd *SCpnt = NULL;
1889 #define TYPE_OTHER 0
1890 #define TYPE_RESET 1
1891 #define TYPE_QUEUE 2
1892 int where_from = TYPE_OTHER;
1893
1894 fas216_checkmagic(info);
1895
1896 /*
1897 * Obtain the next command to process.
1898 */
1899 do {
1900 if (info->rstSCpnt) {
1901 SCpnt = info->rstSCpnt;
1902 /* don't remove it */
1903 where_from = TYPE_RESET;
1904 break;
1905 }
1906
1907 if (info->reqSCpnt) {
1908 SCpnt = info->reqSCpnt;
1909 info->reqSCpnt = NULL;
1910 break;
1911 }
1912
1913 if (info->origSCpnt) {
1914 SCpnt = info->origSCpnt;
1915 info->origSCpnt = NULL;
1916 break;
1917 }
1918
1919 /* retrieve next command */
1920 if (!SCpnt) {
1921 SCpnt = queue_remove_exclude(&info->queues.issue,
1922 info->busyluns);
1923 where_from = TYPE_QUEUE;
1924 break;
1925 }
1926 } while (0);
1927
1928 if (!SCpnt) {
1929 /*
1930 * no command pending, so enable reselection.
1931 */
1932 fas216_cmd(info, CMD_ENABLESEL);
1933 return;
1934 }
1935
1936 /*
1937 * We're going to start a command, so disable reselection
1938 */
1939 fas216_cmd(info, CMD_DISABLESEL);
1940
1941 if (info->scsi.disconnectable && info->SCpnt) {
1942 fas216_log(info, LOG_CONNECT,
1943 "moved command for %d to disconnected queue",
1944 info->SCpnt->device->id);
1945 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
1946 info->scsi.disconnectable = 0;
1947 info->SCpnt = NULL;
1948 }
1949
1950 fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt,
1951 "starting");
1952
1953 switch (where_from) {
1954 case TYPE_QUEUE:
1955 fas216_allocate_tag(info, SCpnt);
1956 fallthrough;
1957 case TYPE_OTHER:
1958 fas216_start_command(info, SCpnt);
1959 break;
1960 case TYPE_RESET:
1961 fas216_do_bus_device_reset(info, SCpnt);
1962 break;
1963 }
1964
1965 fas216_log(info, LOG_CONNECT, "select: data pointers [%p, %X]",
1966 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1967
1968 /*
1969 * should now get either DISCONNECT or
1970 * (FUNCTION DONE with BUS SERVICE) interrupt
1971 */
1972 }
1973
1974 /*
1975 * Clean up from issuing a BUS DEVICE RESET message to a device.
1976 */
fas216_devicereset_done(FAS216_Info * info,struct scsi_cmnd * SCpnt,unsigned int result)1977 static void fas216_devicereset_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
1978 unsigned int result)
1979 {
1980 fas216_log(info, LOG_ERROR, "fas216 device reset complete");
1981
1982 info->rstSCpnt = NULL;
1983 info->rst_dev_status = 1;
1984 wake_up(&info->eh_wait);
1985 }
1986
1987 /**
1988 * fas216_rq_sns_done - Finish processing automatic request sense command
1989 * @info: interface that completed
1990 * @SCpnt: command that completed
1991 * @result: driver byte of result
1992 *
1993 * Finish processing automatic request sense command
1994 */
fas216_rq_sns_done(FAS216_Info * info,struct scsi_cmnd * SCpnt,unsigned int result)1995 static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
1996 unsigned int result)
1997 {
1998 fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
1999 "request sense complete, result=0x%04x%02x%02x",
2000 result, SCpnt->SCp.Message, SCpnt->SCp.Status);
2001
2002 if (result != DID_OK || SCpnt->SCp.Status != SAM_STAT_GOOD)
2003 /*
2004 * Something went wrong. Make sure that we don't
2005 * have valid data in the sense buffer that could
2006 * confuse the higher levels.
2007 */
2008 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2009 //printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id);
2010 //{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); }
2011 /*
2012 * Note that we don't set SCpnt->result, since that should
2013 * reflect the status of the command that we were asked by
2014 * the upper layers to process. This would have been set
2015 * correctly by fas216_std_done.
2016 */
2017 scsi_eh_restore_cmnd(SCpnt, &info->ses);
2018 SCpnt->scsi_done(SCpnt);
2019 }
2020
2021 /**
2022 * fas216_std_done - finish processing of standard command
2023 * @info: interface that completed
2024 * @SCpnt: command that completed
2025 * @result: driver byte of result
2026 *
2027 * Finish processing of standard command
2028 */
2029 static void
fas216_std_done(FAS216_Info * info,struct scsi_cmnd * SCpnt,unsigned int result)2030 fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result)
2031 {
2032 info->stats.fins += 1;
2033
2034 set_host_byte(SCpnt, result);
2035 if (result == DID_OK)
2036 scsi_msg_to_host_byte(SCpnt, info->scsi.SCp.Message);
2037 set_status_byte(SCpnt, info->scsi.SCp.Status);
2038
2039 fas216_log_command(info, LOG_CONNECT, SCpnt,
2040 "command complete, result=0x%08x", SCpnt->result);
2041
2042 /*
2043 * If the driver detected an error, we're all done.
2044 */
2045 if (get_host_byte(SCpnt) != DID_OK)
2046 goto done;
2047
2048 /*
2049 * If the command returned CHECK_CONDITION or COMMAND_TERMINATED
2050 * status, request the sense information.
2051 */
2052 if (get_status_byte(SCpnt) == SAM_STAT_CHECK_CONDITION ||
2053 get_status_byte(SCpnt) == SAM_STAT_COMMAND_TERMINATED)
2054 goto request_sense;
2055
2056 /*
2057 * If the command did not complete with GOOD status,
2058 * we are all done here.
2059 */
2060 if (get_status_byte(SCpnt) != SAM_STAT_GOOD)
2061 goto done;
2062
2063 /*
2064 * We have successfully completed a command. Make sure that
2065 * we do not have any buffers left to transfer. The world
2066 * is not perfect, and we seem to occasionally hit this.
2067 * It can be indicative of a buggy driver, target or the upper
2068 * levels of the SCSI code.
2069 */
2070 if (info->scsi.SCp.ptr) {
2071 switch (SCpnt->cmnd[0]) {
2072 case INQUIRY:
2073 case START_STOP:
2074 case MODE_SENSE:
2075 break;
2076
2077 default:
2078 scmd_printk(KERN_ERR, SCpnt,
2079 "incomplete data transfer detected: res=%08X ptr=%p len=%X\n",
2080 SCpnt->result, info->scsi.SCp.ptr,
2081 info->scsi.SCp.this_residual);
2082 scsi_print_command(SCpnt);
2083 set_host_byte(SCpnt, DID_ERROR);
2084 goto request_sense;
2085 }
2086 }
2087
2088 done:
2089 if (SCpnt->scsi_done) {
2090 SCpnt->scsi_done(SCpnt);
2091 return;
2092 }
2093
2094 panic("scsi%d.H: null scsi_done function in fas216_done",
2095 info->host->host_no);
2096
2097
2098 request_sense:
2099 if (SCpnt->cmnd[0] == REQUEST_SENSE)
2100 goto done;
2101
2102 scsi_eh_prep_cmnd(SCpnt, &info->ses, NULL, 0, ~0);
2103 fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
2104 "requesting sense");
2105 init_SCp(SCpnt);
2106 SCpnt->SCp.Message = 0;
2107 SCpnt->SCp.Status = 0;
2108 SCpnt->host_scribble = (void *)fas216_rq_sns_done;
2109
2110 /*
2111 * Place this command into the high priority "request
2112 * sense" slot. This will be the very next command
2113 * executed, unless a target connects to us.
2114 */
2115 if (info->reqSCpnt)
2116 printk(KERN_WARNING "scsi%d.%c: losing request command\n",
2117 info->host->host_no, '0' + SCpnt->device->id);
2118 info->reqSCpnt = SCpnt;
2119 }
2120
2121 /**
2122 * fas216_done - complete processing for current command
2123 * @info: interface that completed
2124 * @result: driver byte of result
2125 *
2126 * Complete processing for current command
2127 */
fas216_done(FAS216_Info * info,unsigned int result)2128 static void fas216_done(FAS216_Info *info, unsigned int result)
2129 {
2130 void (*fn)(FAS216_Info *, struct scsi_cmnd *, unsigned int);
2131 struct scsi_cmnd *SCpnt;
2132 unsigned long flags;
2133
2134 fas216_checkmagic(info);
2135
2136 if (!info->SCpnt)
2137 goto no_command;
2138
2139 SCpnt = info->SCpnt;
2140 info->SCpnt = NULL;
2141 info->scsi.phase = PHASE_IDLE;
2142
2143 if (info->scsi.aborting) {
2144 fas216_log(info, 0, "uncaught abort - returning DID_ABORT");
2145 result = DID_ABORT;
2146 info->scsi.aborting = 0;
2147 }
2148
2149 /*
2150 * Sanity check the completion - if we have zero bytes left
2151 * to transfer, we should not have a valid pointer.
2152 */
2153 if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) {
2154 scmd_printk(KERN_INFO, SCpnt,
2155 "zero bytes left to transfer, but buffer pointer still valid: ptr=%p len=%08x\n",
2156 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
2157 info->scsi.SCp.ptr = NULL;
2158 scsi_print_command(SCpnt);
2159 }
2160
2161 /*
2162 * Clear down this command as completed. If we need to request
2163 * the sense information, fas216_kick will re-assert the busy
2164 * status.
2165 */
2166 info->device[SCpnt->device->id].parity_check = 0;
2167 clear_bit(SCpnt->device->id * 8 +
2168 (u8)(SCpnt->device->lun & 0x7), info->busyluns);
2169
2170 fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble;
2171 fn(info, SCpnt, result);
2172
2173 if (info->scsi.irq) {
2174 spin_lock_irqsave(&info->host_lock, flags);
2175 if (info->scsi.phase == PHASE_IDLE)
2176 fas216_kick(info);
2177 spin_unlock_irqrestore(&info->host_lock, flags);
2178 }
2179 return;
2180
2181 no_command:
2182 panic("scsi%d.H: null command in fas216_done",
2183 info->host->host_no);
2184 }
2185
2186 /**
2187 * fas216_queue_command - queue a command for adapter to process.
2188 * @SCpnt: Command to queue
2189 * @done: done function to call once command is complete
2190 *
2191 * Queue a command for adapter to process.
2192 * Returns: 0 on success, else error.
2193 * Notes: io_request_lock is held, interrupts are disabled.
2194 */
fas216_queue_command_lck(struct scsi_cmnd * SCpnt,void (* done)(struct scsi_cmnd *))2195 static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt,
2196 void (*done)(struct scsi_cmnd *))
2197 {
2198 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2199 int result;
2200
2201 fas216_checkmagic(info);
2202
2203 fas216_log_command(info, LOG_CONNECT, SCpnt,
2204 "received command (%p)", SCpnt);
2205
2206 SCpnt->scsi_done = done;
2207 SCpnt->host_scribble = (void *)fas216_std_done;
2208 SCpnt->result = 0;
2209
2210 init_SCp(SCpnt);
2211
2212 info->stats.queues += 1;
2213
2214 spin_lock(&info->host_lock);
2215
2216 /*
2217 * Add command into execute queue and let it complete under
2218 * whatever scheme we're using.
2219 */
2220 result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt);
2221
2222 /*
2223 * If we successfully added the command,
2224 * kick the interface to get it moving.
2225 */
2226 if (result == 0 && info->scsi.phase == PHASE_IDLE)
2227 fas216_kick(info);
2228 spin_unlock(&info->host_lock);
2229
2230 fas216_log_target(info, LOG_CONNECT, -1, "queue %s",
2231 result ? "failure" : "success");
2232
2233 return result;
2234 }
2235
DEF_SCSI_QCMD(fas216_queue_command)2236 DEF_SCSI_QCMD(fas216_queue_command)
2237
2238 /**
2239 * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command
2240 * @SCpnt: Command to wake
2241 *
2242 * Trigger restart of a waiting thread in fas216_command
2243 */
2244 static void fas216_internal_done(struct scsi_cmnd *SCpnt)
2245 {
2246 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2247
2248 fas216_checkmagic(info);
2249
2250 info->internal_done = 1;
2251 }
2252
2253 /**
2254 * fas216_noqueue_command - process a command for the adapter.
2255 * @SCpnt: Command to queue
2256 *
2257 * Queue a command for adapter to process.
2258 * Returns: scsi result code.
2259 * Notes: io_request_lock is held, interrupts are disabled.
2260 */
fas216_noqueue_command_lck(struct scsi_cmnd * SCpnt,void (* done)(struct scsi_cmnd *))2261 static int fas216_noqueue_command_lck(struct scsi_cmnd *SCpnt,
2262 void (*done)(struct scsi_cmnd *))
2263 {
2264 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2265
2266 fas216_checkmagic(info);
2267
2268 /*
2269 * We should only be using this if we don't have an interrupt.
2270 * Provide some "incentive" to use the queueing code.
2271 */
2272 BUG_ON(info->scsi.irq);
2273
2274 info->internal_done = 0;
2275 fas216_queue_command_lck(SCpnt, fas216_internal_done);
2276
2277 /*
2278 * This wastes time, since we can't return until the command is
2279 * complete. We can't sleep either since we may get re-entered!
2280 * However, we must re-enable interrupts, or else we'll be
2281 * waiting forever.
2282 */
2283 spin_unlock_irq(info->host->host_lock);
2284
2285 while (!info->internal_done) {
2286 /*
2287 * If we don't have an IRQ, then we must poll the card for
2288 * it's interrupt, and use that to call this driver's
2289 * interrupt routine. That way, we keep the command
2290 * progressing. Maybe we can add some intelligence here
2291 * and go to sleep if we know that the device is going
2292 * to be some time (eg, disconnected).
2293 */
2294 if (fas216_readb(info, REG_STAT) & STAT_INT) {
2295 spin_lock_irq(info->host->host_lock);
2296 fas216_intr(info);
2297 spin_unlock_irq(info->host->host_lock);
2298 }
2299 }
2300
2301 spin_lock_irq(info->host->host_lock);
2302
2303 done(SCpnt);
2304
2305 return 0;
2306 }
2307
DEF_SCSI_QCMD(fas216_noqueue_command)2308 DEF_SCSI_QCMD(fas216_noqueue_command)
2309
2310 /*
2311 * Error handler timeout function. Indicate that we timed out,
2312 * and wake up any error handler process so it can continue.
2313 */
2314 static void fas216_eh_timer(struct timer_list *t)
2315 {
2316 FAS216_Info *info = from_timer(info, t, eh_timer);
2317
2318 fas216_log(info, LOG_ERROR, "error handling timed out\n");
2319
2320 del_timer(&info->eh_timer);
2321
2322 if (info->rst_bus_status == 0)
2323 info->rst_bus_status = -1;
2324 if (info->rst_dev_status == 0)
2325 info->rst_dev_status = -1;
2326
2327 wake_up(&info->eh_wait);
2328 }
2329
2330 enum res_find {
2331 res_failed, /* not found */
2332 res_success, /* command on issue queue */
2333 res_hw_abort /* command on disconnected dev */
2334 };
2335
2336 /**
2337 * fas216_do_abort - decide how to abort a command
2338 * @SCpnt: command to abort
2339 *
2340 * Decide how to abort a command.
2341 * Returns: abort status
2342 */
fas216_find_command(FAS216_Info * info,struct scsi_cmnd * SCpnt)2343 static enum res_find fas216_find_command(FAS216_Info *info,
2344 struct scsi_cmnd *SCpnt)
2345 {
2346 enum res_find res = res_failed;
2347
2348 if (queue_remove_cmd(&info->queues.issue, SCpnt)) {
2349 /*
2350 * The command was on the issue queue, and has not been
2351 * issued yet. We can remove the command from the queue,
2352 * and acknowledge the abort. Neither the device nor the
2353 * interface know about the command.
2354 */
2355 printk("on issue queue ");
2356
2357 res = res_success;
2358 } else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) {
2359 /*
2360 * The command was on the disconnected queue. We must
2361 * reconnect with the device if possible, and send it
2362 * an abort message.
2363 */
2364 printk("on disconnected queue ");
2365
2366 res = res_hw_abort;
2367 } else if (info->SCpnt == SCpnt) {
2368 printk("executing ");
2369
2370 switch (info->scsi.phase) {
2371 /*
2372 * If the interface is idle, and the command is 'disconnectable',
2373 * then it is the same as on the disconnected queue.
2374 */
2375 case PHASE_IDLE:
2376 if (info->scsi.disconnectable) {
2377 info->scsi.disconnectable = 0;
2378 info->SCpnt = NULL;
2379 res = res_hw_abort;
2380 }
2381 break;
2382
2383 default:
2384 break;
2385 }
2386 } else if (info->origSCpnt == SCpnt) {
2387 /*
2388 * The command will be executed next, but a command
2389 * is currently using the interface. This is similar to
2390 * being on the issue queue, except the busylun bit has
2391 * been set.
2392 */
2393 info->origSCpnt = NULL;
2394 clear_bit(SCpnt->device->id * 8 +
2395 (u8)(SCpnt->device->lun & 0x7), info->busyluns);
2396 printk("waiting for execution ");
2397 res = res_success;
2398 } else
2399 printk("unknown ");
2400
2401 return res;
2402 }
2403
2404 /**
2405 * fas216_eh_abort - abort this command
2406 * @SCpnt: command to abort
2407 *
2408 * Abort this command.
2409 * Returns: FAILED if unable to abort
2410 * Notes: io_request_lock is taken, and irqs are disabled
2411 */
fas216_eh_abort(struct scsi_cmnd * SCpnt)2412 int fas216_eh_abort(struct scsi_cmnd *SCpnt)
2413 {
2414 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2415 int result = FAILED;
2416
2417 fas216_checkmagic(info);
2418
2419 info->stats.aborts += 1;
2420
2421 scmd_printk(KERN_WARNING, SCpnt, "abort command\n");
2422
2423 print_debug_list();
2424 fas216_dumpstate(info);
2425
2426 switch (fas216_find_command(info, SCpnt)) {
2427 /*
2428 * We found the command, and cleared it out. Either
2429 * the command is still known to be executing on the
2430 * target, or the busylun bit is not set.
2431 */
2432 case res_success:
2433 scmd_printk(KERN_WARNING, SCpnt, "abort %p success\n", SCpnt);
2434 result = SUCCESS;
2435 break;
2436
2437 /*
2438 * We need to reconnect to the target and send it an
2439 * ABORT or ABORT_TAG message. We can only do this
2440 * if the bus is free.
2441 */
2442 case res_hw_abort:
2443
2444 /*
2445 * We are unable to abort the command for some reason.
2446 */
2447 default:
2448 case res_failed:
2449 scmd_printk(KERN_WARNING, SCpnt, "abort %p failed\n", SCpnt);
2450 break;
2451 }
2452
2453 return result;
2454 }
2455
2456 /**
2457 * fas216_eh_device_reset - Reset the device associated with this command
2458 * @SCpnt: command specifing device to reset
2459 *
2460 * Reset the device associated with this command.
2461 * Returns: FAILED if unable to reset.
2462 * Notes: We won't be re-entered, so we'll only have one device
2463 * reset on the go at one time.
2464 */
fas216_eh_device_reset(struct scsi_cmnd * SCpnt)2465 int fas216_eh_device_reset(struct scsi_cmnd *SCpnt)
2466 {
2467 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2468 unsigned long flags;
2469 int i, res = FAILED, target = SCpnt->device->id;
2470
2471 fas216_log(info, LOG_ERROR, "device reset for target %d", target);
2472
2473 spin_lock_irqsave(&info->host_lock, flags);
2474
2475 do {
2476 /*
2477 * If we are currently connected to a device, and
2478 * it is the device we want to reset, there is
2479 * nothing we can do here. Chances are it is stuck,
2480 * and we need a bus reset.
2481 */
2482 if (info->SCpnt && !info->scsi.disconnectable &&
2483 info->SCpnt->device->id == SCpnt->device->id)
2484 break;
2485
2486 /*
2487 * We're going to be resetting this device. Remove
2488 * all pending commands from the driver. By doing
2489 * so, we guarantee that we won't touch the command
2490 * structures except to process the reset request.
2491 */
2492 queue_remove_all_target(&info->queues.issue, target);
2493 queue_remove_all_target(&info->queues.disconnected, target);
2494 if (info->origSCpnt && info->origSCpnt->device->id == target)
2495 info->origSCpnt = NULL;
2496 if (info->reqSCpnt && info->reqSCpnt->device->id == target)
2497 info->reqSCpnt = NULL;
2498 for (i = 0; i < 8; i++)
2499 clear_bit(target * 8 + i, info->busyluns);
2500
2501 /*
2502 * Hijack this SCSI command structure to send
2503 * a bus device reset message to this device.
2504 */
2505 SCpnt->host_scribble = (void *)fas216_devicereset_done;
2506
2507 info->rst_dev_status = 0;
2508 info->rstSCpnt = SCpnt;
2509
2510 if (info->scsi.phase == PHASE_IDLE)
2511 fas216_kick(info);
2512
2513 mod_timer(&info->eh_timer, jiffies + 30 * HZ);
2514 spin_unlock_irqrestore(&info->host_lock, flags);
2515
2516 /*
2517 * Wait up to 30 seconds for the reset to complete.
2518 */
2519 wait_event(info->eh_wait, info->rst_dev_status);
2520
2521 del_timer_sync(&info->eh_timer);
2522 spin_lock_irqsave(&info->host_lock, flags);
2523 info->rstSCpnt = NULL;
2524
2525 if (info->rst_dev_status == 1)
2526 res = SUCCESS;
2527 } while (0);
2528
2529 SCpnt->host_scribble = NULL;
2530 spin_unlock_irqrestore(&info->host_lock, flags);
2531
2532 fas216_log(info, LOG_ERROR, "device reset complete: %s\n",
2533 res == SUCCESS ? "success" : "failed");
2534
2535 return res;
2536 }
2537
2538 /**
2539 * fas216_eh_bus_reset - Reset the bus associated with the command
2540 * @SCpnt: command specifing bus to reset
2541 *
2542 * Reset the bus associated with the command.
2543 * Returns: FAILED if unable to reset.
2544 * Notes: Further commands are blocked.
2545 */
fas216_eh_bus_reset(struct scsi_cmnd * SCpnt)2546 int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt)
2547 {
2548 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2549 unsigned long flags;
2550 struct scsi_device *SDpnt;
2551
2552 fas216_checkmagic(info);
2553 fas216_log(info, LOG_ERROR, "resetting bus");
2554
2555 info->stats.bus_resets += 1;
2556
2557 spin_lock_irqsave(&info->host_lock, flags);
2558
2559 /*
2560 * Stop all activity on this interface.
2561 */
2562 fas216_aborttransfer(info);
2563 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2564
2565 /*
2566 * Clear any pending interrupts.
2567 */
2568 while (fas216_readb(info, REG_STAT) & STAT_INT)
2569 fas216_readb(info, REG_INST);
2570
2571 info->rst_bus_status = 0;
2572
2573 /*
2574 * For each attached hard-reset device, clear out
2575 * all command structures. Leave the running
2576 * command in place.
2577 */
2578 shost_for_each_device(SDpnt, info->host) {
2579 int i;
2580
2581 if (SDpnt->soft_reset)
2582 continue;
2583
2584 queue_remove_all_target(&info->queues.issue, SDpnt->id);
2585 queue_remove_all_target(&info->queues.disconnected, SDpnt->id);
2586 if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id)
2587 info->origSCpnt = NULL;
2588 if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id)
2589 info->reqSCpnt = NULL;
2590 info->SCpnt = NULL;
2591
2592 for (i = 0; i < 8; i++)
2593 clear_bit(SDpnt->id * 8 + i, info->busyluns);
2594 }
2595
2596 info->scsi.phase = PHASE_IDLE;
2597
2598 /*
2599 * Reset the SCSI bus. Device cleanup happens in
2600 * the interrupt handler.
2601 */
2602 fas216_cmd(info, CMD_RESETSCSI);
2603
2604 mod_timer(&info->eh_timer, jiffies + HZ);
2605 spin_unlock_irqrestore(&info->host_lock, flags);
2606
2607 /*
2608 * Wait one second for the interrupt.
2609 */
2610 wait_event(info->eh_wait, info->rst_bus_status);
2611 del_timer_sync(&info->eh_timer);
2612
2613 fas216_log(info, LOG_ERROR, "bus reset complete: %s\n",
2614 info->rst_bus_status == 1 ? "success" : "failed");
2615
2616 return info->rst_bus_status == 1 ? SUCCESS : FAILED;
2617 }
2618
2619 /**
2620 * fas216_init_chip - Initialise FAS216 state after reset
2621 * @info: state structure for interface
2622 *
2623 * Initialise FAS216 state after reset
2624 */
fas216_init_chip(FAS216_Info * info)2625 static void fas216_init_chip(FAS216_Info *info)
2626 {
2627 unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7;
2628 fas216_writeb(info, REG_CLKF, clock);
2629 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2630 fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]);
2631 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2632 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
2633 fas216_writeb(info, REG_SOF, 0);
2634 fas216_writeb(info, REG_STP, info->scsi.async_stp);
2635 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2636 }
2637
2638 /**
2639 * fas216_eh_host_reset - Reset the host associated with this command
2640 * @SCpnt: command specifing host to reset
2641 *
2642 * Reset the host associated with this command.
2643 * Returns: FAILED if unable to reset.
2644 * Notes: io_request_lock is taken, and irqs are disabled
2645 */
fas216_eh_host_reset(struct scsi_cmnd * SCpnt)2646 int fas216_eh_host_reset(struct scsi_cmnd *SCpnt)
2647 {
2648 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2649
2650 spin_lock_irq(info->host->host_lock);
2651
2652 fas216_checkmagic(info);
2653
2654 fas216_log(info, LOG_ERROR, "resetting host");
2655
2656 /*
2657 * Reset the SCSI chip.
2658 */
2659 fas216_cmd(info, CMD_RESETCHIP);
2660
2661 /*
2662 * Ugly ugly ugly!
2663 * We need to release the host_lock and enable
2664 * IRQs if we sleep, but we must relock and disable
2665 * IRQs after the sleep.
2666 */
2667 spin_unlock_irq(info->host->host_lock);
2668 msleep(50 * 1000/100);
2669 spin_lock_irq(info->host->host_lock);
2670
2671 /*
2672 * Release the SCSI reset.
2673 */
2674 fas216_cmd(info, CMD_NOP);
2675
2676 fas216_init_chip(info);
2677
2678 spin_unlock_irq(info->host->host_lock);
2679 return SUCCESS;
2680 }
2681
2682 #define TYPE_UNKNOWN 0
2683 #define TYPE_NCR53C90 1
2684 #define TYPE_NCR53C90A 2
2685 #define TYPE_NCR53C9x 3
2686 #define TYPE_Am53CF94 4
2687 #define TYPE_EmFAS216 5
2688 #define TYPE_QLFAS216 6
2689
2690 static char *chip_types[] = {
2691 "unknown",
2692 "NS NCR53C90",
2693 "NS NCR53C90A",
2694 "NS NCR53C9x",
2695 "AMD Am53CF94",
2696 "Emulex FAS216",
2697 "QLogic FAS216"
2698 };
2699
fas216_detect_type(FAS216_Info * info)2700 static int fas216_detect_type(FAS216_Info *info)
2701 {
2702 int family, rev;
2703
2704 /*
2705 * Reset the chip.
2706 */
2707 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2708 udelay(50);
2709 fas216_writeb(info, REG_CMD, CMD_NOP);
2710
2711 /*
2712 * Check to see if control reg 2 is present.
2713 */
2714 fas216_writeb(info, REG_CNTL3, 0);
2715 fas216_writeb(info, REG_CNTL2, CNTL2_S2FE);
2716
2717 /*
2718 * If we are unable to read back control reg 2
2719 * correctly, it is not present, and we have a
2720 * NCR53C90.
2721 */
2722 if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE)
2723 return TYPE_NCR53C90;
2724
2725 /*
2726 * Now, check control register 3
2727 */
2728 fas216_writeb(info, REG_CNTL2, 0);
2729 fas216_writeb(info, REG_CNTL3, 0);
2730 fas216_writeb(info, REG_CNTL3, 5);
2731
2732 /*
2733 * If we are unable to read the register back
2734 * correctly, we have a NCR53C90A
2735 */
2736 if (fas216_readb(info, REG_CNTL3) != 5)
2737 return TYPE_NCR53C90A;
2738
2739 /*
2740 * Now read the ID from the chip.
2741 */
2742 fas216_writeb(info, REG_CNTL3, 0);
2743
2744 fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK);
2745 fas216_writeb(info, REG_CNTL3, 0);
2746
2747 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2748 udelay(50);
2749 fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP);
2750
2751 fas216_writeb(info, REG_CNTL2, CNTL2_ENF);
2752 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2753 udelay(50);
2754 fas216_writeb(info, REG_CMD, CMD_NOP);
2755
2756 rev = fas216_readb(info, REG_ID);
2757 family = rev >> 3;
2758 rev &= 7;
2759
2760 switch (family) {
2761 case 0x01:
2762 if (rev == 4)
2763 return TYPE_Am53CF94;
2764 break;
2765
2766 case 0x02:
2767 switch (rev) {
2768 case 2:
2769 return TYPE_EmFAS216;
2770 case 3:
2771 return TYPE_QLFAS216;
2772 }
2773 break;
2774
2775 default:
2776 break;
2777 }
2778 printk("family %x rev %x\n", family, rev);
2779 return TYPE_NCR53C9x;
2780 }
2781
2782 /**
2783 * fas216_reset_state - Initialise driver internal state
2784 * @info: state to initialise
2785 *
2786 * Initialise driver internal state
2787 */
fas216_reset_state(FAS216_Info * info)2788 static void fas216_reset_state(FAS216_Info *info)
2789 {
2790 int i;
2791
2792 fas216_checkmagic(info);
2793
2794 fas216_bus_reset(info);
2795
2796 /*
2797 * Clear out all stale info in our state structure
2798 */
2799 memset(info->busyluns, 0, sizeof(info->busyluns));
2800 info->scsi.disconnectable = 0;
2801 info->scsi.aborting = 0;
2802
2803 for (i = 0; i < 8; i++) {
2804 info->device[i].parity_enabled = 0;
2805 info->device[i].parity_check = 1;
2806 }
2807
2808 /*
2809 * Drain all commands on disconnected queue
2810 */
2811 while (queue_remove(&info->queues.disconnected) != NULL);
2812
2813 /*
2814 * Remove executing commands.
2815 */
2816 info->SCpnt = NULL;
2817 info->reqSCpnt = NULL;
2818 info->rstSCpnt = NULL;
2819 info->origSCpnt = NULL;
2820 }
2821
2822 /**
2823 * fas216_init - initialise FAS/NCR/AMD SCSI structures.
2824 * @host: a driver-specific filled-out structure
2825 *
2826 * Initialise FAS/NCR/AMD SCSI structures.
2827 * Returns: 0 on success
2828 */
fas216_init(struct Scsi_Host * host)2829 int fas216_init(struct Scsi_Host *host)
2830 {
2831 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2832
2833 info->magic_start = MAGIC;
2834 info->magic_end = MAGIC;
2835 info->host = host;
2836 info->scsi.cfg[0] = host->this_id | CNTL1_PERE;
2837 info->scsi.cfg[1] = CNTL2_ENF | CNTL2_S2FE;
2838 info->scsi.cfg[2] = info->ifcfg.cntl3 |
2839 CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM;
2840 info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod);
2841
2842 info->rst_dev_status = -1;
2843 info->rst_bus_status = -1;
2844 init_waitqueue_head(&info->eh_wait);
2845 timer_setup(&info->eh_timer, fas216_eh_timer, 0);
2846
2847 spin_lock_init(&info->host_lock);
2848
2849 memset(&info->stats, 0, sizeof(info->stats));
2850
2851 msgqueue_initialise(&info->scsi.msgs);
2852
2853 if (!queue_initialise(&info->queues.issue))
2854 return -ENOMEM;
2855
2856 if (!queue_initialise(&info->queues.disconnected)) {
2857 queue_free(&info->queues.issue);
2858 return -ENOMEM;
2859 }
2860
2861 return 0;
2862 }
2863
2864 /**
2865 * fas216_add - initialise FAS/NCR/AMD SCSI ic.
2866 * @host: a driver-specific filled-out structure
2867 * @dev: parent device
2868 *
2869 * Initialise FAS/NCR/AMD SCSI ic.
2870 * Returns: 0 on success
2871 */
fas216_add(struct Scsi_Host * host,struct device * dev)2872 int fas216_add(struct Scsi_Host *host, struct device *dev)
2873 {
2874 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2875 int type, ret;
2876
2877 if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) {
2878 printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n",
2879 info->ifcfg.clockrate);
2880 return -EINVAL;
2881 }
2882
2883 fas216_reset_state(info);
2884 type = fas216_detect_type(info);
2885 info->scsi.type = chip_types[type];
2886
2887 udelay(300);
2888
2889 /*
2890 * Initialise the chip correctly.
2891 */
2892 fas216_init_chip(info);
2893
2894 /*
2895 * Reset the SCSI bus. We don't want to see
2896 * the resulting reset interrupt, so mask it
2897 * out.
2898 */
2899 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR);
2900 fas216_writeb(info, REG_CMD, CMD_RESETSCSI);
2901
2902 /*
2903 * scsi standard says wait 250ms
2904 */
2905 spin_unlock_irq(info->host->host_lock);
2906 msleep(100*1000/100);
2907 spin_lock_irq(info->host->host_lock);
2908
2909 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2910 fas216_readb(info, REG_INST);
2911
2912 fas216_checkmagic(info);
2913
2914 ret = scsi_add_host(host, dev);
2915 if (ret)
2916 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2917 else
2918 scsi_scan_host(host);
2919
2920 return ret;
2921 }
2922
fas216_remove(struct Scsi_Host * host)2923 void fas216_remove(struct Scsi_Host *host)
2924 {
2925 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2926
2927 fas216_checkmagic(info);
2928 scsi_remove_host(host);
2929
2930 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2931 scsi_host_put(host);
2932 }
2933
2934 /**
2935 * fas216_release - release all resources for FAS/NCR/AMD SCSI ic.
2936 * @host: a driver-specific filled-out structure
2937 *
2938 * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic.
2939 */
fas216_release(struct Scsi_Host * host)2940 void fas216_release(struct Scsi_Host *host)
2941 {
2942 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2943
2944 queue_free(&info->queues.disconnected);
2945 queue_free(&info->queues.issue);
2946 }
2947
fas216_print_host(FAS216_Info * info,struct seq_file * m)2948 void fas216_print_host(FAS216_Info *info, struct seq_file *m)
2949 {
2950 seq_printf(m,
2951 "\n"
2952 "Chip : %s\n"
2953 " Address: 0x%p\n"
2954 " IRQ : %d\n"
2955 " DMA : %d\n",
2956 info->scsi.type, info->scsi.io_base,
2957 info->scsi.irq, info->scsi.dma);
2958 }
2959
fas216_print_stats(FAS216_Info * info,struct seq_file * m)2960 void fas216_print_stats(FAS216_Info *info, struct seq_file *m)
2961 {
2962 seq_printf(m, "\n"
2963 "Command Statistics:\n"
2964 " Queued : %u\n"
2965 " Issued : %u\n"
2966 " Completed : %u\n"
2967 " Reads : %u\n"
2968 " Writes : %u\n"
2969 " Others : %u\n"
2970 " Disconnects: %u\n"
2971 " Aborts : %u\n"
2972 " Bus resets : %u\n"
2973 " Host resets: %u\n",
2974 info->stats.queues, info->stats.removes,
2975 info->stats.fins, info->stats.reads,
2976 info->stats.writes, info->stats.miscs,
2977 info->stats.disconnects, info->stats.aborts,
2978 info->stats.bus_resets, info->stats.host_resets);
2979 }
2980
fas216_print_devices(FAS216_Info * info,struct seq_file * m)2981 void fas216_print_devices(FAS216_Info *info, struct seq_file *m)
2982 {
2983 struct fas216_device *dev;
2984 struct scsi_device *scd;
2985
2986 seq_puts(m, "Device/Lun TaggedQ Parity Sync\n");
2987
2988 shost_for_each_device(scd, info->host) {
2989 dev = &info->device[scd->id];
2990 seq_printf(m, " %d/%llu ", scd->id, scd->lun);
2991 if (scd->tagged_supported)
2992 seq_printf(m, "%3sabled ",
2993 scd->simple_tags ? "en" : "dis");
2994 else
2995 seq_puts(m, "unsupported ");
2996
2997 seq_printf(m, "%3sabled ", dev->parity_enabled ? "en" : "dis");
2998
2999 if (dev->sof)
3000 seq_printf(m, "offset %d, %d ns\n",
3001 dev->sof, dev->period * 4);
3002 else
3003 seq_puts(m, "async\n");
3004 }
3005 }
3006
3007 EXPORT_SYMBOL(fas216_init);
3008 EXPORT_SYMBOL(fas216_add);
3009 EXPORT_SYMBOL(fas216_queue_command);
3010 EXPORT_SYMBOL(fas216_noqueue_command);
3011 EXPORT_SYMBOL(fas216_intr);
3012 EXPORT_SYMBOL(fas216_remove);
3013 EXPORT_SYMBOL(fas216_release);
3014 EXPORT_SYMBOL(fas216_eh_abort);
3015 EXPORT_SYMBOL(fas216_eh_device_reset);
3016 EXPORT_SYMBOL(fas216_eh_bus_reset);
3017 EXPORT_SYMBOL(fas216_eh_host_reset);
3018 EXPORT_SYMBOL(fas216_print_host);
3019 EXPORT_SYMBOL(fas216_print_stats);
3020 EXPORT_SYMBOL(fas216_print_devices);
3021
3022 MODULE_AUTHOR("Russell King");
3023 MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core");
3024 MODULE_LICENSE("GPL");
3025