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1 /*
2 * linux/drivers/acorn/scsi/fas216.c
3 *
4 * Copyright (C) 1997-2003 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Based on information in qlogicfas.c by Tom Zerucha, Michael Griffith, and
11 * other sources, including:
12 * the AMD Am53CF94 data sheet
13 * the AMD Am53C94 data sheet
14 *
15 * This is a generic driver. To use it, have a look at cumana_2.c. You
16 * should define your own structure that overlays FAS216_Info, eg:
17 * struct my_host_data {
18 * FAS216_Info info;
19 * ... my host specific data ...
20 * };
21 *
22 * Changelog:
23 * 30-08-1997 RMK Created
24 * 14-09-1997 RMK Started disconnect support
25 * 08-02-1998 RMK Corrected real DMA support
26 * 15-02-1998 RMK Started sync xfer support
27 * 06-04-1998 RMK Tightened conditions for printing incomplete
28 * transfers
29 * 02-05-1998 RMK Added extra checks in fas216_reset
30 * 24-05-1998 RMK Fixed synchronous transfers with period >= 200ns
31 * 27-06-1998 RMK Changed asm/delay.h to linux/delay.h
32 * 26-08-1998 RMK Improved message support wrt MESSAGE_REJECT
33 * 02-04-2000 RMK Converted to use the new error handling, and
34 * automatically request sense data upon check
35 * condition status from targets.
36 */
37 #include <linux/module.h>
38 #include <linux/blkdev.h>
39 #include <linux/kernel.h>
40 #include <linux/string.h>
41 #include <linux/ioport.h>
42 #include <linux/proc_fs.h>
43 #include <linux/delay.h>
44 #include <linux/bitops.h>
45 #include <linux/init.h>
46 #include <linux/interrupt.h>
47
48 #include <asm/dma.h>
49 #include <asm/io.h>
50 #include <asm/irq.h>
51 #include <asm/ecard.h>
52
53 #include "../scsi.h"
54 #include <scsi/scsi_dbg.h>
55 #include <scsi/scsi_host.h>
56 #include "fas216.h"
57 #include "scsi.h"
58
59 /* NOTE: SCSI2 Synchronous transfers *require* DMA according to
60 * the data sheet. This restriction is crazy, especially when
61 * you only want to send 16 bytes! What were the guys who
62 * designed this chip on at that time? Did they read the SCSI2
63 * spec at all? The following sections are taken from the SCSI2
64 * standard (s2r10) concerning this:
65 *
66 * > IMPLEMENTORS NOTES:
67 * > (1) Re-negotiation at every selection is not recommended, since a
68 * > significant performance impact is likely.
69 *
70 * > The implied synchronous agreement shall remain in effect until a BUS DEVICE
71 * > RESET message is received, until a hard reset condition occurs, or until one
72 * > of the two SCSI devices elects to modify the agreement. The default data
73 * > transfer mode is asynchronous data transfer mode. The default data transfer
74 * > mode is entered at power on, after a BUS DEVICE RESET message, or after a hard
75 * > reset condition.
76 *
77 * In total, this means that once you have elected to use synchronous
78 * transfers, you must always use DMA.
79 *
80 * I was thinking that this was a good chip until I found this restriction ;(
81 */
82 #define SCSI2_SYNC
83 #undef SCSI2_TAG
84
85 #undef DEBUG_CONNECT
86 #undef DEBUG_MESSAGES
87
88 #undef CHECK_STRUCTURE
89
90 #define LOG_CONNECT (1 << 0)
91 #define LOG_BUSSERVICE (1 << 1)
92 #define LOG_FUNCTIONDONE (1 << 2)
93 #define LOG_MESSAGES (1 << 3)
94 #define LOG_BUFFER (1 << 4)
95 #define LOG_ERROR (1 << 8)
96
97 static int level_mask = LOG_ERROR;
98
99 module_param(level_mask, int, 0644);
100
101 static int __init fas216_log_setup(char *str)
102 {
103 char *s;
104
105 level_mask = 0;
106
107 while ((s = strsep(&str, ",")) != NULL) {
108 switch (s[0]) {
109 case 'a':
110 if (strcmp(s, "all") == 0)
111 level_mask |= -1;
112 break;
113 case 'b':
114 if (strncmp(s, "bus", 3) == 0)
115 level_mask |= LOG_BUSSERVICE;
116 if (strncmp(s, "buf", 3) == 0)
117 level_mask |= LOG_BUFFER;
118 break;
119 case 'c':
120 level_mask |= LOG_CONNECT;
121 break;
122 case 'e':
123 level_mask |= LOG_ERROR;
124 break;
125 case 'm':
126 level_mask |= LOG_MESSAGES;
127 break;
128 case 'n':
129 if (strcmp(s, "none") == 0)
130 level_mask = 0;
131 break;
132 case 's':
133 level_mask |= LOG_FUNCTIONDONE;
134 break;
135 }
136 }
137 return 1;
138 }
139
140 __setup("fas216_logging=", fas216_log_setup);
141
142 static inline unsigned char fas216_readb(FAS216_Info *info, unsigned int reg)
143 {
144 unsigned int off = reg << info->scsi.io_shift;
145 return readb(info->scsi.io_base + off);
146 }
147
148 static inline void fas216_writeb(FAS216_Info *info, unsigned int reg, unsigned int val)
149 {
150 unsigned int off = reg << info->scsi.io_shift;
151 writeb(val, info->scsi.io_base + off);
152 }
153
154 static void fas216_dumpstate(FAS216_Info *info)
155 {
156 unsigned char is, stat, inst;
157
158 is = fas216_readb(info, REG_IS);
159 stat = fas216_readb(info, REG_STAT);
160 inst = fas216_readb(info, REG_INST);
161
162 printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X"
163 " INST=%02X IS=%02X CFIS=%02X",
164 fas216_readb(info, REG_CTCL),
165 fas216_readb(info, REG_CTCM),
166 fas216_readb(info, REG_CMD), stat, inst, is,
167 fas216_readb(info, REG_CFIS));
168 printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n",
169 fas216_readb(info, REG_CNTL1),
170 fas216_readb(info, REG_CNTL2),
171 fas216_readb(info, REG_CNTL3),
172 fas216_readb(info, REG_CTCH));
173 }
174
175 static void print_SCp(struct scsi_pointer *SCp, const char *prefix, const char *suffix)
176 {
177 printk("%sptr %p this_residual 0x%x buffer %p buffers_residual 0x%x%s",
178 prefix, SCp->ptr, SCp->this_residual, SCp->buffer,
179 SCp->buffers_residual, suffix);
180 }
181
182 #ifdef CHECK_STRUCTURE
183 static void fas216_dumpinfo(FAS216_Info *info)
184 {
185 static int used = 0;
186 int i;
187
188 if (used++)
189 return;
190
191 printk("FAS216_Info=\n");
192 printk(" { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p\n",
193 info->magic_start, info->host, info->SCpnt,
194 info->origSCpnt);
195 printk(" scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }\n",
196 info->scsi.io_shift, info->scsi.irq,
197 info->scsi.cfg[0], info->scsi.cfg[1], info->scsi.cfg[2],
198 info->scsi.cfg[3]);
199 printk(" type=%p phase=%X\n",
200 info->scsi.type, info->scsi.phase);
201 print_SCp(&info->scsi.SCp, " SCp={ ", " }\n");
202 printk(" msgs async_stp=%X disconnectable=%d aborting=%d }\n",
203 info->scsi.async_stp,
204 info->scsi.disconnectable, info->scsi.aborting);
205 printk(" stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X\n"
206 " disconnects=%X aborts=%X bus_resets=%X host_resets=%X}\n",
207 info->stats.queues, info->stats.removes, info->stats.fins,
208 info->stats.reads, info->stats.writes, info->stats.miscs,
209 info->stats.disconnects, info->stats.aborts, info->stats.bus_resets,
210 info->stats.host_resets);
211 printk(" ifcfg={ clockrate=%X select_timeout=%X asyncperiod=%X sync_max_depth=%X }\n",
212 info->ifcfg.clockrate, info->ifcfg.select_timeout,
213 info->ifcfg.asyncperiod, info->ifcfg.sync_max_depth);
214 for (i = 0; i < 8; i++) {
215 printk(" busyluns[%d]=%08lx dev[%d]={ disconnect_ok=%d stp=%X sof=%X sync_state=%X }\n",
216 i, info->busyluns[i], i,
217 info->device[i].disconnect_ok, info->device[i].stp,
218 info->device[i].sof, info->device[i].sync_state);
219 }
220 printk(" dma={ transfer_type=%X setup=%p pseudo=%p stop=%p }\n",
221 info->dma.transfer_type, info->dma.setup,
222 info->dma.pseudo, info->dma.stop);
223 printk(" internal_done=%X magic_end=%lX }\n",
224 info->internal_done, info->magic_end);
225 }
226
227 static void __fas216_checkmagic(FAS216_Info *info, const char *func)
228 {
229 int corruption = 0;
230 if (info->magic_start != MAGIC) {
231 printk(KERN_CRIT "FAS216 Error: magic at start corrupted\n");
232 corruption++;
233 }
234 if (info->magic_end != MAGIC) {
235 printk(KERN_CRIT "FAS216 Error: magic at end corrupted\n");
236 corruption++;
237 }
238 if (corruption) {
239 fas216_dumpinfo(info);
240 panic("scsi memory space corrupted in %s", func);
241 }
242 }
243 #define fas216_checkmagic(info) __fas216_checkmagic((info), __func__)
244 #else
245 #define fas216_checkmagic(info)
246 #endif
247
248 static const char *fas216_bus_phase(int stat)
249 {
250 static const char *phases[] = {
251 "DATA OUT", "DATA IN",
252 "COMMAND", "STATUS",
253 "MISC OUT", "MISC IN",
254 "MESG OUT", "MESG IN"
255 };
256
257 return phases[stat & STAT_BUSMASK];
258 }
259
260 static const char *fas216_drv_phase(FAS216_Info *info)
261 {
262 static const char *phases[] = {
263 [PHASE_IDLE] = "idle",
264 [PHASE_SELECTION] = "selection",
265 [PHASE_COMMAND] = "command",
266 [PHASE_DATAOUT] = "data out",
267 [PHASE_DATAIN] = "data in",
268 [PHASE_MSGIN] = "message in",
269 [PHASE_MSGIN_DISCONNECT]= "disconnect",
270 [PHASE_MSGOUT_EXPECT] = "expect message out",
271 [PHASE_MSGOUT] = "message out",
272 [PHASE_STATUS] = "status",
273 [PHASE_DONE] = "done",
274 };
275
276 if (info->scsi.phase < ARRAY_SIZE(phases) &&
277 phases[info->scsi.phase])
278 return phases[info->scsi.phase];
279 return "???";
280 }
281
282 static char fas216_target(FAS216_Info *info)
283 {
284 if (info->SCpnt)
285 return '0' + info->SCpnt->device->id;
286 else
287 return 'H';
288 }
289
290 static void
291 fas216_do_log(FAS216_Info *info, char target, char *fmt, va_list ap)
292 {
293 static char buf[1024];
294
295 vsnprintf(buf, sizeof(buf), fmt, ap);
296 printk("scsi%d.%c: %s", info->host->host_no, target, buf);
297 }
298
299 static void fas216_log_command(FAS216_Info *info, int level,
300 struct scsi_cmnd *SCpnt, char *fmt, ...)
301 {
302 va_list args;
303
304 if (level != 0 && !(level & level_mask))
305 return;
306
307 va_start(args, fmt);
308 fas216_do_log(info, '0' + SCpnt->device->id, fmt, args);
309 va_end(args);
310
311 scsi_print_command(SCpnt);
312 }
313
314 static void
315 fas216_log_target(FAS216_Info *info, int level, int target, char *fmt, ...)
316 {
317 va_list args;
318
319 if (level != 0 && !(level & level_mask))
320 return;
321
322 if (target < 0)
323 target = 'H';
324 else
325 target += '0';
326
327 va_start(args, fmt);
328 fas216_do_log(info, target, fmt, args);
329 va_end(args);
330
331 printk("\n");
332 }
333
334 static void fas216_log(FAS216_Info *info, int level, char *fmt, ...)
335 {
336 va_list args;
337
338 if (level != 0 && !(level & level_mask))
339 return;
340
341 va_start(args, fmt);
342 fas216_do_log(info, fas216_target(info), fmt, args);
343 va_end(args);
344
345 printk("\n");
346 }
347
348 #define PH_SIZE 32
349
350 static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE];
351 static int ph_ptr;
352
353 static void add_debug_list(int stat, int ssr, int isr, int ph)
354 {
355 ph_list[ph_ptr].stat = stat;
356 ph_list[ph_ptr].ssr = ssr;
357 ph_list[ph_ptr].isr = isr;
358 ph_list[ph_ptr].ph = ph;
359
360 ph_ptr = (ph_ptr + 1) & (PH_SIZE-1);
361 }
362
363 static struct { int command; void *from; } cmd_list[8];
364 static int cmd_ptr;
365
366 static void fas216_cmd(FAS216_Info *info, unsigned int command)
367 {
368 cmd_list[cmd_ptr].command = command;
369 cmd_list[cmd_ptr].from = __builtin_return_address(0);
370
371 cmd_ptr = (cmd_ptr + 1) & 7;
372
373 fas216_writeb(info, REG_CMD, command);
374 }
375
376 static void print_debug_list(void)
377 {
378 int i;
379
380 i = ph_ptr;
381
382 printk(KERN_ERR "SCSI IRQ trail\n");
383 do {
384 printk(" %02x:%02x:%02x:%1x",
385 ph_list[i].stat, ph_list[i].ssr,
386 ph_list[i].isr, ph_list[i].ph);
387 i = (i + 1) & (PH_SIZE - 1);
388 if (((i ^ ph_ptr) & 7) == 0)
389 printk("\n");
390 } while (i != ph_ptr);
391 if ((i ^ ph_ptr) & 7)
392 printk("\n");
393
394 i = cmd_ptr;
395 printk(KERN_ERR "FAS216 commands: ");
396 do {
397 printk("%02x:%p ", cmd_list[i].command, cmd_list[i].from);
398 i = (i + 1) & 7;
399 } while (i != cmd_ptr);
400 printk("\n");
401 }
402
403 static void fas216_done(FAS216_Info *info, unsigned int result);
404
405 /**
406 * fas216_get_last_msg - retrive last message from the list
407 * @info: interface to search
408 * @pos: current fifo position
409 *
410 * Retrieve a last message from the list, using position in fifo.
411 */
412 static inline unsigned short
413 fas216_get_last_msg(FAS216_Info *info, int pos)
414 {
415 unsigned short packed_msg = NOP;
416 struct message *msg;
417 int msgnr = 0;
418
419 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
420 if (pos >= msg->fifo)
421 break;
422 }
423
424 if (msg) {
425 if (msg->msg[0] == EXTENDED_MESSAGE)
426 packed_msg = EXTENDED_MESSAGE | msg->msg[2] << 8;
427 else
428 packed_msg = msg->msg[0];
429 }
430
431 fas216_log(info, LOG_MESSAGES,
432 "Message: %04x found at position %02x\n", packed_msg, pos);
433
434 return packed_msg;
435 }
436
437 /**
438 * fas216_syncperiod - calculate STP register value
439 * @info: state structure for interface connected to device
440 * @ns: period in ns (between subsequent bytes)
441 *
442 * Calculate value to be loaded into the STP register for a given period
443 * in ns. Returns a value suitable for REG_STP.
444 */
445 static int fas216_syncperiod(FAS216_Info *info, int ns)
446 {
447 int value = (info->ifcfg.clockrate * ns) / 1000;
448
449 fas216_checkmagic(info);
450
451 if (value < 4)
452 value = 4;
453 else if (value > 35)
454 value = 35;
455
456 return value & 31;
457 }
458
459 /**
460 * fas216_set_sync - setup FAS216 chip for specified transfer period.
461 * @info: state structure for interface connected to device
462 * @target: target
463 *
464 * Correctly setup FAS216 chip for specified transfer period.
465 * Notes : we need to switch the chip out of FASTSCSI mode if we have
466 * a transfer period >= 200ns - otherwise the chip will violate
467 * the SCSI timings.
468 */
469 static void fas216_set_sync(FAS216_Info *info, int target)
470 {
471 unsigned int cntl3;
472
473 fas216_writeb(info, REG_SOF, info->device[target].sof);
474 fas216_writeb(info, REG_STP, info->device[target].stp);
475
476 cntl3 = info->scsi.cfg[2];
477 if (info->device[target].period >= (200 / 4))
478 cntl3 = cntl3 & ~CNTL3_FASTSCSI;
479
480 fas216_writeb(info, REG_CNTL3, cntl3);
481 }
482
483 /* Synchronous transfer support
484 *
485 * Note: The SCSI II r10 spec says (5.6.12):
486 *
487 * (2) Due to historical problems with early host adapters that could
488 * not accept an SDTR message, some targets may not initiate synchronous
489 * negotiation after a power cycle as required by this standard. Host
490 * adapters that support synchronous mode may avoid the ensuing failure
491 * modes when the target is independently power cycled by initiating a
492 * synchronous negotiation on each REQUEST SENSE and INQUIRY command.
493 * This approach increases the SCSI bus overhead and is not recommended
494 * for new implementations. The correct method is to respond to an
495 * SDTR message with a MESSAGE REJECT message if the either the
496 * initiator or target devices does not support synchronous transfers
497 * or does not want to negotiate for synchronous transfers at the time.
498 * Using the correct method assures compatibility with wide data
499 * transfers and future enhancements.
500 *
501 * We will always initiate a synchronous transfer negotiation request on
502 * every INQUIRY or REQUEST SENSE message, unless the target itself has
503 * at some point performed a synchronous transfer negotiation request, or
504 * we have synchronous transfers disabled for this device.
505 */
506
507 /**
508 * fas216_handlesync - Handle a synchronous transfer message
509 * @info: state structure for interface
510 * @msg: message from target
511 *
512 * Handle a synchronous transfer message from the target
513 */
514 static void fas216_handlesync(FAS216_Info *info, char *msg)
515 {
516 struct fas216_device *dev = &info->device[info->SCpnt->device->id];
517 enum { sync, async, none, reject } res = none;
518
519 #ifdef SCSI2_SYNC
520 switch (msg[0]) {
521 case MESSAGE_REJECT:
522 /* Synchronous transfer request failed.
523 * Note: SCSI II r10:
524 *
525 * SCSI devices that are capable of synchronous
526 * data transfers shall not respond to an SDTR
527 * message with a MESSAGE REJECT message.
528 *
529 * Hence, if we get this condition, we disable
530 * negotiation for this device.
531 */
532 if (dev->sync_state == neg_inprogress) {
533 dev->sync_state = neg_invalid;
534 res = async;
535 }
536 break;
537
538 case EXTENDED_MESSAGE:
539 switch (dev->sync_state) {
540 /* We don't accept synchronous transfer requests.
541 * Respond with a MESSAGE_REJECT to prevent a
542 * synchronous transfer agreement from being reached.
543 */
544 case neg_invalid:
545 res = reject;
546 break;
547
548 /* We were not negotiating a synchronous transfer,
549 * but the device sent us a negotiation request.
550 * Honour the request by sending back a SDTR
551 * message containing our capability, limited by
552 * the targets capability.
553 */
554 default:
555 fas216_cmd(info, CMD_SETATN);
556 if (msg[4] > info->ifcfg.sync_max_depth)
557 msg[4] = info->ifcfg.sync_max_depth;
558 if (msg[3] < 1000 / info->ifcfg.clockrate)
559 msg[3] = 1000 / info->ifcfg.clockrate;
560
561 msgqueue_flush(&info->scsi.msgs);
562 msgqueue_addmsg(&info->scsi.msgs, 5,
563 EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
564 msg[3], msg[4]);
565 info->scsi.phase = PHASE_MSGOUT_EXPECT;
566
567 /* This is wrong. The agreement is not in effect
568 * until this message is accepted by the device
569 */
570 dev->sync_state = neg_targcomplete;
571 res = sync;
572 break;
573
574 /* We initiated the synchronous transfer negotiation,
575 * and have successfully received a response from the
576 * target. The synchronous transfer agreement has been
577 * reached. Note: if the values returned are out of our
578 * bounds, we must reject the message.
579 */
580 case neg_inprogress:
581 res = reject;
582 if (msg[4] <= info->ifcfg.sync_max_depth &&
583 msg[3] >= 1000 / info->ifcfg.clockrate) {
584 dev->sync_state = neg_complete;
585 res = sync;
586 }
587 break;
588 }
589 }
590 #else
591 res = reject;
592 #endif
593
594 switch (res) {
595 case sync:
596 dev->period = msg[3];
597 dev->sof = msg[4];
598 dev->stp = fas216_syncperiod(info, msg[3] * 4);
599 fas216_set_sync(info, info->SCpnt->device->id);
600 break;
601
602 case reject:
603 fas216_cmd(info, CMD_SETATN);
604 msgqueue_flush(&info->scsi.msgs);
605 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
606 info->scsi.phase = PHASE_MSGOUT_EXPECT;
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 */
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 */
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
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
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 */
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 */
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 */
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
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 */
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
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
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 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
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
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
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 */
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 */
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 */
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 */
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
1378 default:
1379 break;
1380 }
1381
1382 fas216_cmd(info, CMD_NOP);
1383
1384 #define STATE(st,ph) ((ph) << 3 | (st))
1385 /* This table describes the legal SCSI state transitions,
1386 * as described by the SCSI II spec.
1387 */
1388 switch (STATE(stat & STAT_BUSMASK, info->scsi.phase)) {
1389 case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In */
1390 case STATE(STAT_DATAIN, PHASE_MSGOUT): /* Message Out -> Data In */
1391 case STATE(STAT_DATAIN, PHASE_COMMAND): /* Command -> Data In */
1392 case STATE(STAT_DATAIN, PHASE_MSGIN): /* Message In -> Data In */
1393 info->scsi.phase = PHASE_DATAIN;
1394 fas216_transfer(info);
1395 return;
1396
1397 case STATE(STAT_DATAIN, PHASE_DATAIN): /* Data In -> Data In */
1398 case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out -> Data Out */
1399 fas216_cleanuptransfer(info);
1400 fas216_transfer(info);
1401 return;
1402
1403 case STATE(STAT_DATAOUT, PHASE_SELSTEPS):/* Sel w/ steps-> Data Out */
1404 case STATE(STAT_DATAOUT, PHASE_MSGOUT): /* Message Out -> Data Out */
1405 case STATE(STAT_DATAOUT, PHASE_COMMAND):/* Command -> Data Out */
1406 case STATE(STAT_DATAOUT, PHASE_MSGIN): /* Message In -> Data Out */
1407 fas216_cmd(info, CMD_FLUSHFIFO);
1408 info->scsi.phase = PHASE_DATAOUT;
1409 fas216_transfer(info);
1410 return;
1411
1412 case STATE(STAT_STATUS, PHASE_DATAOUT): /* Data Out -> Status */
1413 case STATE(STAT_STATUS, PHASE_DATAIN): /* Data In -> Status */
1414 fas216_stoptransfer(info);
1415 case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status */
1416 case STATE(STAT_STATUS, PHASE_MSGOUT): /* Message Out -> Status */
1417 case STATE(STAT_STATUS, PHASE_COMMAND): /* Command -> Status */
1418 case STATE(STAT_STATUS, PHASE_MSGIN): /* Message In -> Status */
1419 fas216_cmd(info, CMD_INITCMDCOMPLETE);
1420 info->scsi.phase = PHASE_STATUS;
1421 return;
1422
1423 case STATE(STAT_MESGIN, PHASE_DATAOUT): /* Data Out -> Message In */
1424 case STATE(STAT_MESGIN, PHASE_DATAIN): /* Data In -> Message In */
1425 fas216_stoptransfer(info);
1426 case STATE(STAT_MESGIN, PHASE_COMMAND): /* Command -> Message In */
1427 case STATE(STAT_MESGIN, PHASE_SELSTEPS):/* Sel w/ steps -> Message In */
1428 case STATE(STAT_MESGIN, PHASE_MSGOUT): /* Message Out -> Message In */
1429 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1430 fas216_cmd(info, CMD_FLUSHFIFO);
1431 fas216_cmd(info, CMD_TRANSFERINFO);
1432 info->scsi.phase = PHASE_MSGIN;
1433 return;
1434
1435 case STATE(STAT_MESGIN, PHASE_MSGIN):
1436 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
1437 fas216_cmd(info, CMD_TRANSFERINFO);
1438 return;
1439
1440 case STATE(STAT_COMMAND, PHASE_MSGOUT): /* Message Out -> Command */
1441 case STATE(STAT_COMMAND, PHASE_MSGIN): /* Message In -> Command */
1442 fas216_send_command(info);
1443 info->scsi.phase = PHASE_COMMAND;
1444 return;
1445
1446
1447 /*
1448 * Selection -> Message Out
1449 */
1450 case STATE(STAT_MESGOUT, PHASE_SELECTION):
1451 fas216_send_messageout(info, 1);
1452 return;
1453
1454 /*
1455 * Message Out -> Message Out
1456 */
1457 case STATE(STAT_MESGOUT, PHASE_SELSTEPS):
1458 case STATE(STAT_MESGOUT, PHASE_MSGOUT):
1459 /*
1460 * If we get another message out phase, this usually
1461 * means some parity error occurred. Resend complete
1462 * set of messages. If we have more than one byte to
1463 * send, we need to assert ATN again.
1464 */
1465 if (info->device[info->SCpnt->device->id].parity_check) {
1466 /*
1467 * We were testing... good, the device
1468 * supports parity checking.
1469 */
1470 info->device[info->SCpnt->device->id].parity_check = 0;
1471 info->device[info->SCpnt->device->id].parity_enabled = 1;
1472 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1473 }
1474
1475 if (msgqueue_msglength(&info->scsi.msgs) > 1)
1476 fas216_cmd(info, CMD_SETATN);
1477 /*FALLTHROUGH*/
1478
1479 /*
1480 * Any -> Message Out
1481 */
1482 case STATE(STAT_MESGOUT, PHASE_MSGOUT_EXPECT):
1483 fas216_send_messageout(info, 0);
1484 return;
1485
1486 /* Error recovery rules.
1487 * These either attempt to abort or retry the operation.
1488 * TODO: we need more of these
1489 */
1490 case STATE(STAT_COMMAND, PHASE_COMMAND):/* Command -> Command */
1491 /* error - we've sent out all the command bytes
1492 * we have.
1493 * NOTE: we need SAVE DATA POINTERS/RESTORE DATA POINTERS
1494 * to include the command bytes sent for this to work
1495 * correctly.
1496 */
1497 printk(KERN_ERR "scsi%d.%c: "
1498 "target trying to receive more command bytes\n",
1499 info->host->host_no, fas216_target(info));
1500 fas216_cmd(info, CMD_SETATN);
1501 fas216_set_stc(info, 15);
1502 fas216_cmd(info, CMD_PADBYTES | CMD_WITHDMA);
1503 msgqueue_flush(&info->scsi.msgs);
1504 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1505 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1506 return;
1507 }
1508
1509 if (info->scsi.phase == PHASE_MSGIN_DISCONNECT) {
1510 printk(KERN_ERR "scsi%d.%c: disconnect message received, but bus service %s?\n",
1511 info->host->host_no, fas216_target(info),
1512 fas216_bus_phase(stat));
1513 msgqueue_flush(&info->scsi.msgs);
1514 fas216_cmd(info, CMD_SETATN);
1515 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
1516 info->scsi.phase = PHASE_MSGOUT_EXPECT;
1517 info->scsi.aborting = 1;
1518 fas216_cmd(info, CMD_TRANSFERINFO);
1519 return;
1520 }
1521 printk(KERN_ERR "scsi%d.%c: bus phase %s after %s?\n",
1522 info->host->host_no, fas216_target(info),
1523 fas216_bus_phase(stat),
1524 fas216_drv_phase(info));
1525 print_debug_list();
1526 return;
1527
1528 bad_is:
1529 fas216_log(info, 0, "bus service at step %d?", is & IS_BITS);
1530 fas216_dumpstate(info);
1531 print_debug_list();
1532
1533 fas216_done(info, DID_ERROR);
1534 }
1535
1536 /**
1537 * fas216_funcdone_intr - handle a function done interrupt from FAS216 chip
1538 * @info: interface which caused function done interrupt
1539 * @stat: Status register contents
1540 * @is: SCSI Status register contents
1541 *
1542 * Handle a function done interrupt from FAS216 chip
1543 */
1544 static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
1545 {
1546 unsigned int fifo_len = fas216_readb(info, REG_CFIS) & CFIS_CF;
1547
1548 fas216_checkmagic(info);
1549
1550 fas216_log(info, LOG_FUNCTIONDONE,
1551 "function done: stat=%02x is=%02x phase=%02x",
1552 stat, is, info->scsi.phase);
1553
1554 switch (info->scsi.phase) {
1555 case PHASE_STATUS: /* status phase - read status and msg */
1556 if (fifo_len != 2) {
1557 fas216_log(info, 0, "odd number of bytes in FIFO: %d", fifo_len);
1558 }
1559 /*
1560 * Read status then message byte.
1561 */
1562 info->scsi.SCp.Status = fas216_readb(info, REG_FF);
1563 info->scsi.SCp.Message = fas216_readb(info, REG_FF);
1564 info->scsi.phase = PHASE_DONE;
1565 fas216_cmd(info, CMD_MSGACCEPTED);
1566 break;
1567
1568 case PHASE_IDLE:
1569 case PHASE_SELECTION:
1570 case PHASE_SELSTEPS:
1571 break;
1572
1573 case PHASE_MSGIN: /* message in phase */
1574 if ((stat & STAT_BUSMASK) == STAT_MESGIN) {
1575 info->scsi.msgin_fifo = fifo_len;
1576 fas216_message(info);
1577 break;
1578 }
1579
1580 default:
1581 fas216_log(info, 0, "internal phase %s for function done?"
1582 " What do I do with this?",
1583 fas216_target(info), fas216_drv_phase(info));
1584 }
1585 }
1586
1587 static void fas216_bus_reset(FAS216_Info *info)
1588 {
1589 neg_t sync_state;
1590 int i;
1591
1592 msgqueue_flush(&info->scsi.msgs);
1593
1594 sync_state = neg_invalid;
1595
1596 #ifdef SCSI2_SYNC
1597 if (info->ifcfg.capabilities & (FASCAP_DMA|FASCAP_PSEUDODMA))
1598 sync_state = neg_wait;
1599 #endif
1600
1601 info->scsi.phase = PHASE_IDLE;
1602 info->SCpnt = NULL; /* bug! */
1603 memset(&info->scsi.SCp, 0, sizeof(info->scsi.SCp));
1604
1605 for (i = 0; i < 8; i++) {
1606 info->device[i].disconnect_ok = info->ifcfg.disconnect_ok;
1607 info->device[i].sync_state = sync_state;
1608 info->device[i].period = info->ifcfg.asyncperiod / 4;
1609 info->device[i].stp = info->scsi.async_stp;
1610 info->device[i].sof = 0;
1611 info->device[i].wide_xfer = 0;
1612 }
1613
1614 info->rst_bus_status = 1;
1615 wake_up(&info->eh_wait);
1616 }
1617
1618 /**
1619 * fas216_intr - handle interrupts to progress a command
1620 * @info: interface to service
1621 *
1622 * Handle interrupts from the interface to progress a command
1623 */
1624 irqreturn_t fas216_intr(FAS216_Info *info)
1625 {
1626 unsigned char inst, is, stat;
1627 int handled = IRQ_NONE;
1628
1629 fas216_checkmagic(info);
1630
1631 stat = fas216_readb(info, REG_STAT);
1632 is = fas216_readb(info, REG_IS);
1633 inst = fas216_readb(info, REG_INST);
1634
1635 add_debug_list(stat, is, inst, info->scsi.phase);
1636
1637 if (stat & STAT_INT) {
1638 if (inst & INST_BUSRESET) {
1639 fas216_log(info, 0, "bus reset detected");
1640 fas216_bus_reset(info);
1641 scsi_report_bus_reset(info->host, 0);
1642 } else if (inst & INST_ILLEGALCMD) {
1643 fas216_log(info, LOG_ERROR, "illegal command given\n");
1644 fas216_dumpstate(info);
1645 print_debug_list();
1646 } else if (inst & INST_DISCONNECT)
1647 fas216_disconnect_intr(info);
1648 else if (inst & INST_RESELECTED) /* reselected */
1649 fas216_reselected_intr(info);
1650 else if (inst & INST_BUSSERVICE) /* bus service request */
1651 fas216_busservice_intr(info, stat, is);
1652 else if (inst & INST_FUNCDONE) /* function done */
1653 fas216_funcdone_intr(info, stat, is);
1654 else
1655 fas216_log(info, 0, "unknown interrupt received:"
1656 " phase %s inst %02X is %02X stat %02X",
1657 fas216_drv_phase(info), inst, is, stat);
1658 handled = IRQ_HANDLED;
1659 }
1660 return handled;
1661 }
1662
1663 static void __fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1664 {
1665 int tot_msglen;
1666
1667 /* following what the ESP driver says */
1668 fas216_set_stc(info, 0);
1669 fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1670
1671 /* flush FIFO */
1672 fas216_cmd(info, CMD_FLUSHFIFO);
1673
1674 /* load bus-id and timeout */
1675 fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1676 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1677
1678 /* synchronous transfers */
1679 fas216_set_sync(info, SCpnt->device->id);
1680
1681 tot_msglen = msgqueue_msglength(&info->scsi.msgs);
1682
1683 #ifdef DEBUG_MESSAGES
1684 {
1685 struct message *msg;
1686 int msgnr = 0, i;
1687
1688 printk("scsi%d.%c: message out: ",
1689 info->host->host_no, '0' + SCpnt->device->id);
1690 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1691 printk("{ ");
1692 for (i = 0; i < msg->length; i++)
1693 printk("%02x ", msg->msg[i]);
1694 printk("} ");
1695 }
1696 printk("\n");
1697 }
1698 #endif
1699
1700 if (tot_msglen == 1 || tot_msglen == 3) {
1701 /*
1702 * We have an easy message length to send...
1703 */
1704 struct message *msg;
1705 int msgnr = 0, i;
1706
1707 info->scsi.phase = PHASE_SELSTEPS;
1708
1709 /* load message bytes */
1710 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
1711 for (i = 0; i < msg->length; i++)
1712 fas216_writeb(info, REG_FF, msg->msg[i]);
1713 msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
1714 }
1715
1716 /* load command */
1717 for (i = 0; i < SCpnt->cmd_len; i++)
1718 fas216_writeb(info, REG_FF, SCpnt->cmnd[i]);
1719
1720 if (tot_msglen == 1)
1721 fas216_cmd(info, CMD_SELECTATN);
1722 else
1723 fas216_cmd(info, CMD_SELECTATN3);
1724 } else {
1725 /*
1726 * We have an unusual number of message bytes to send.
1727 * Load first byte into fifo, and issue SELECT with ATN and
1728 * stop steps.
1729 */
1730 struct message *msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1731
1732 fas216_writeb(info, REG_FF, msg->msg[0]);
1733 msg->fifo = 1;
1734
1735 fas216_cmd(info, CMD_SELECTATNSTOP);
1736 }
1737 }
1738
1739 /*
1740 * Decide whether we need to perform a parity test on this device.
1741 * Can also be used to force parity error conditions during initial
1742 * information transfer phase (message out) for test purposes.
1743 */
1744 static int parity_test(FAS216_Info *info, int target)
1745 {
1746 #if 0
1747 if (target == 3) {
1748 info->device[target].parity_check = 0;
1749 return 1;
1750 }
1751 #endif
1752 return info->device[target].parity_check;
1753 }
1754
1755 static void fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1756 {
1757 int disconnect_ok;
1758
1759 /*
1760 * claim host busy
1761 */
1762 info->scsi.phase = PHASE_SELECTION;
1763 info->scsi.SCp = SCpnt->SCp;
1764 info->SCpnt = SCpnt;
1765 info->dma.transfer_type = fasdma_none;
1766
1767 if (parity_test(info, SCpnt->device->id))
1768 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_PTE);
1769 else
1770 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
1771
1772 /*
1773 * Don't allow request sense commands to disconnect.
1774 */
1775 disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE &&
1776 info->device[SCpnt->device->id].disconnect_ok;
1777
1778 /*
1779 * build outgoing message bytes
1780 */
1781 msgqueue_flush(&info->scsi.msgs);
1782 msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->device->lun));
1783
1784 /*
1785 * add tag message if required
1786 */
1787 if (SCpnt->tag)
1788 msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG, SCpnt->tag);
1789
1790 do {
1791 #ifdef SCSI2_SYNC
1792 if ((info->device[SCpnt->device->id].sync_state == neg_wait ||
1793 info->device[SCpnt->device->id].sync_state == neg_complete) &&
1794 (SCpnt->cmnd[0] == REQUEST_SENSE ||
1795 SCpnt->cmnd[0] == INQUIRY)) {
1796 info->device[SCpnt->device->id].sync_state = neg_inprogress;
1797 msgqueue_addmsg(&info->scsi.msgs, 5,
1798 EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
1799 1000 / info->ifcfg.clockrate,
1800 info->ifcfg.sync_max_depth);
1801 break;
1802 }
1803 #endif
1804 } while (0);
1805
1806 __fas216_start_command(info, SCpnt);
1807 }
1808
1809 static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt)
1810 {
1811 #ifdef SCSI2_TAG
1812 /*
1813 * tagged queuing - allocate a new tag to this command
1814 */
1815 if (SCpnt->device->simple_tags && SCpnt->cmnd[0] != REQUEST_SENSE &&
1816 SCpnt->cmnd[0] != INQUIRY) {
1817 SCpnt->device->current_tag += 1;
1818 if (SCpnt->device->current_tag == 0)
1819 SCpnt->device->current_tag = 1;
1820 SCpnt->tag = SCpnt->device->current_tag;
1821 } else
1822 #endif
1823 set_bit(SCpnt->device->id * 8 +
1824 (u8)(SCpnt->device->lun & 0x7), info->busyluns);
1825
1826 info->stats.removes += 1;
1827 switch (SCpnt->cmnd[0]) {
1828 case WRITE_6:
1829 case WRITE_10:
1830 case WRITE_12:
1831 info->stats.writes += 1;
1832 break;
1833 case READ_6:
1834 case READ_10:
1835 case READ_12:
1836 info->stats.reads += 1;
1837 break;
1838 default:
1839 info->stats.miscs += 1;
1840 break;
1841 }
1842 }
1843
1844 static void fas216_do_bus_device_reset(FAS216_Info *info,
1845 struct scsi_cmnd *SCpnt)
1846 {
1847 struct message *msg;
1848
1849 /*
1850 * claim host busy
1851 */
1852 info->scsi.phase = PHASE_SELECTION;
1853 info->scsi.SCp = SCpnt->SCp;
1854 info->SCpnt = SCpnt;
1855 info->dma.transfer_type = fasdma_none;
1856
1857 fas216_log(info, LOG_ERROR, "sending bus device reset");
1858
1859 msgqueue_flush(&info->scsi.msgs);
1860 msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET);
1861
1862 /* following what the ESP driver says */
1863 fas216_set_stc(info, 0);
1864 fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
1865
1866 /* flush FIFO */
1867 fas216_cmd(info, CMD_FLUSHFIFO);
1868
1869 /* load bus-id and timeout */
1870 fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
1871 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
1872
1873 /* synchronous transfers */
1874 fas216_set_sync(info, SCpnt->device->id);
1875
1876 msg = msgqueue_getmsg(&info->scsi.msgs, 0);
1877
1878 fas216_writeb(info, REG_FF, BUS_DEVICE_RESET);
1879 msg->fifo = 1;
1880
1881 fas216_cmd(info, CMD_SELECTATNSTOP);
1882 }
1883
1884 /**
1885 * fas216_kick - kick a command to the interface
1886 * @info: our host interface to kick
1887 *
1888 * Kick a command to the interface, interface should be idle.
1889 * Notes: Interrupts are always disabled!
1890 */
1891 static void fas216_kick(FAS216_Info *info)
1892 {
1893 struct scsi_cmnd *SCpnt = NULL;
1894 #define TYPE_OTHER 0
1895 #define TYPE_RESET 1
1896 #define TYPE_QUEUE 2
1897 int where_from = TYPE_OTHER;
1898
1899 fas216_checkmagic(info);
1900
1901 /*
1902 * Obtain the next command to process.
1903 */
1904 do {
1905 if (info->rstSCpnt) {
1906 SCpnt = info->rstSCpnt;
1907 /* don't remove it */
1908 where_from = TYPE_RESET;
1909 break;
1910 }
1911
1912 if (info->reqSCpnt) {
1913 SCpnt = info->reqSCpnt;
1914 info->reqSCpnt = NULL;
1915 break;
1916 }
1917
1918 if (info->origSCpnt) {
1919 SCpnt = info->origSCpnt;
1920 info->origSCpnt = NULL;
1921 break;
1922 }
1923
1924 /* retrieve next command */
1925 if (!SCpnt) {
1926 SCpnt = queue_remove_exclude(&info->queues.issue,
1927 info->busyluns);
1928 where_from = TYPE_QUEUE;
1929 break;
1930 }
1931 } while (0);
1932
1933 if (!SCpnt) {
1934 /*
1935 * no command pending, so enable reselection.
1936 */
1937 fas216_cmd(info, CMD_ENABLESEL);
1938 return;
1939 }
1940
1941 /*
1942 * We're going to start a command, so disable reselection
1943 */
1944 fas216_cmd(info, CMD_DISABLESEL);
1945
1946 if (info->scsi.disconnectable && info->SCpnt) {
1947 fas216_log(info, LOG_CONNECT,
1948 "moved command for %d to disconnected queue",
1949 info->SCpnt->device->id);
1950 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
1951 info->scsi.disconnectable = 0;
1952 info->SCpnt = NULL;
1953 }
1954
1955 fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt,
1956 "starting");
1957
1958 switch (where_from) {
1959 case TYPE_QUEUE:
1960 fas216_allocate_tag(info, SCpnt);
1961 case TYPE_OTHER:
1962 fas216_start_command(info, SCpnt);
1963 break;
1964 case TYPE_RESET:
1965 fas216_do_bus_device_reset(info, SCpnt);
1966 break;
1967 }
1968
1969 fas216_log(info, LOG_CONNECT, "select: data pointers [%p, %X]",
1970 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
1971
1972 /*
1973 * should now get either DISCONNECT or
1974 * (FUNCTION DONE with BUS SERVICE) interrupt
1975 */
1976 }
1977
1978 /*
1979 * Clean up from issuing a BUS DEVICE RESET message to a device.
1980 */
1981 static void fas216_devicereset_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
1982 unsigned int result)
1983 {
1984 fas216_log(info, LOG_ERROR, "fas216 device reset complete");
1985
1986 info->rstSCpnt = NULL;
1987 info->rst_dev_status = 1;
1988 wake_up(&info->eh_wait);
1989 }
1990
1991 /**
1992 * fas216_rq_sns_done - Finish processing automatic request sense command
1993 * @info: interface that completed
1994 * @SCpnt: command that completed
1995 * @result: driver byte of result
1996 *
1997 * Finish processing automatic request sense command
1998 */
1999 static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
2000 unsigned int result)
2001 {
2002 fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
2003 "request sense complete, result=0x%04x%02x%02x",
2004 result, SCpnt->SCp.Message, SCpnt->SCp.Status);
2005
2006 if (result != DID_OK || SCpnt->SCp.Status != GOOD)
2007 /*
2008 * Something went wrong. Make sure that we don't
2009 * have valid data in the sense buffer that could
2010 * confuse the higher levels.
2011 */
2012 memset(SCpnt->sense_buffer, 0, sizeof(SCpnt->sense_buffer));
2013 //printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id);
2014 //{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); }
2015 /*
2016 * Note that we don't set SCpnt->result, since that should
2017 * reflect the status of the command that we were asked by
2018 * the upper layers to process. This would have been set
2019 * correctly by fas216_std_done.
2020 */
2021 scsi_eh_restore_cmnd(SCpnt, &info->ses);
2022 SCpnt->scsi_done(SCpnt);
2023 }
2024
2025 /**
2026 * fas216_std_done - finish processing of standard command
2027 * @info: interface that completed
2028 * @SCpnt: command that completed
2029 * @result: driver byte of result
2030 *
2031 * Finish processing of standard command
2032 */
2033 static void
2034 fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result)
2035 {
2036 info->stats.fins += 1;
2037
2038 SCpnt->result = result << 16 | info->scsi.SCp.Message << 8 |
2039 info->scsi.SCp.Status;
2040
2041 fas216_log_command(info, LOG_CONNECT, SCpnt,
2042 "command complete, result=0x%08x", SCpnt->result);
2043
2044 /*
2045 * If the driver detected an error, we're all done.
2046 */
2047 if (host_byte(SCpnt->result) != DID_OK ||
2048 msg_byte(SCpnt->result) != COMMAND_COMPLETE)
2049 goto done;
2050
2051 /*
2052 * If the command returned CHECK_CONDITION or COMMAND_TERMINATED
2053 * status, request the sense information.
2054 */
2055 if (status_byte(SCpnt->result) == CHECK_CONDITION ||
2056 status_byte(SCpnt->result) == COMMAND_TERMINATED)
2057 goto request_sense;
2058
2059 /*
2060 * If the command did not complete with GOOD status,
2061 * we are all done here.
2062 */
2063 if (status_byte(SCpnt->result) != GOOD)
2064 goto done;
2065
2066 /*
2067 * We have successfully completed a command. Make sure that
2068 * we do not have any buffers left to transfer. The world
2069 * is not perfect, and we seem to occasionally hit this.
2070 * It can be indicative of a buggy driver, target or the upper
2071 * levels of the SCSI code.
2072 */
2073 if (info->scsi.SCp.ptr) {
2074 switch (SCpnt->cmnd[0]) {
2075 case INQUIRY:
2076 case START_STOP:
2077 case MODE_SENSE:
2078 break;
2079
2080 default:
2081 scmd_printk(KERN_ERR, SCpnt,
2082 "incomplete data transfer detected: res=%08X ptr=%p len=%X\n",
2083 SCpnt->result, info->scsi.SCp.ptr,
2084 info->scsi.SCp.this_residual);
2085 scsi_print_command(SCpnt);
2086 set_host_byte(SCpnt, DID_ERROR);
2087 goto request_sense;
2088 }
2089 }
2090
2091 done:
2092 if (SCpnt->scsi_done) {
2093 SCpnt->scsi_done(SCpnt);
2094 return;
2095 }
2096
2097 panic("scsi%d.H: null scsi_done function in fas216_done",
2098 info->host->host_no);
2099
2100
2101 request_sense:
2102 if (SCpnt->cmnd[0] == REQUEST_SENSE)
2103 goto done;
2104
2105 scsi_eh_prep_cmnd(SCpnt, &info->ses, NULL, 0, ~0);
2106 fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
2107 "requesting sense");
2108 init_SCp(SCpnt);
2109 SCpnt->SCp.Message = 0;
2110 SCpnt->SCp.Status = 0;
2111 SCpnt->tag = 0;
2112 SCpnt->host_scribble = (void *)fas216_rq_sns_done;
2113
2114 /*
2115 * Place this command into the high priority "request
2116 * sense" slot. This will be the very next command
2117 * executed, unless a target connects to us.
2118 */
2119 if (info->reqSCpnt)
2120 printk(KERN_WARNING "scsi%d.%c: losing request command\n",
2121 info->host->host_no, '0' + SCpnt->device->id);
2122 info->reqSCpnt = SCpnt;
2123 }
2124
2125 /**
2126 * fas216_done - complete processing for current command
2127 * @info: interface that completed
2128 * @result: driver byte of result
2129 *
2130 * Complete processing for current command
2131 */
2132 static void fas216_done(FAS216_Info *info, unsigned int result)
2133 {
2134 void (*fn)(FAS216_Info *, struct scsi_cmnd *, unsigned int);
2135 struct scsi_cmnd *SCpnt;
2136 unsigned long flags;
2137
2138 fas216_checkmagic(info);
2139
2140 if (!info->SCpnt)
2141 goto no_command;
2142
2143 SCpnt = info->SCpnt;
2144 info->SCpnt = NULL;
2145 info->scsi.phase = PHASE_IDLE;
2146
2147 if (info->scsi.aborting) {
2148 fas216_log(info, 0, "uncaught abort - returning DID_ABORT");
2149 result = DID_ABORT;
2150 info->scsi.aborting = 0;
2151 }
2152
2153 /*
2154 * Sanity check the completion - if we have zero bytes left
2155 * to transfer, we should not have a valid pointer.
2156 */
2157 if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) {
2158 scmd_printk(KERN_INFO, SCpnt,
2159 "zero bytes left to transfer, but buffer pointer still valid: ptr=%p len=%08x\n",
2160 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
2161 info->scsi.SCp.ptr = NULL;
2162 scsi_print_command(SCpnt);
2163 }
2164
2165 /*
2166 * Clear down this command as completed. If we need to request
2167 * the sense information, fas216_kick will re-assert the busy
2168 * status.
2169 */
2170 info->device[SCpnt->device->id].parity_check = 0;
2171 clear_bit(SCpnt->device->id * 8 +
2172 (u8)(SCpnt->device->lun & 0x7), info->busyluns);
2173
2174 fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble;
2175 fn(info, SCpnt, result);
2176
2177 if (info->scsi.irq) {
2178 spin_lock_irqsave(&info->host_lock, flags);
2179 if (info->scsi.phase == PHASE_IDLE)
2180 fas216_kick(info);
2181 spin_unlock_irqrestore(&info->host_lock, flags);
2182 }
2183 return;
2184
2185 no_command:
2186 panic("scsi%d.H: null command in fas216_done",
2187 info->host->host_no);
2188 }
2189
2190 /**
2191 * fas216_queue_command - queue a command for adapter to process.
2192 * @SCpnt: Command to queue
2193 * @done: done function to call once command is complete
2194 *
2195 * Queue a command for adapter to process.
2196 * Returns: 0 on success, else error.
2197 * Notes: io_request_lock is held, interrupts are disabled.
2198 */
2199 static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt,
2200 void (*done)(struct scsi_cmnd *))
2201 {
2202 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2203 int result;
2204
2205 fas216_checkmagic(info);
2206
2207 fas216_log_command(info, LOG_CONNECT, SCpnt,
2208 "received command (%p)", SCpnt);
2209
2210 SCpnt->scsi_done = done;
2211 SCpnt->host_scribble = (void *)fas216_std_done;
2212 SCpnt->result = 0;
2213
2214 init_SCp(SCpnt);
2215
2216 info->stats.queues += 1;
2217 SCpnt->tag = 0;
2218
2219 spin_lock(&info->host_lock);
2220
2221 /*
2222 * Add command into execute queue and let it complete under
2223 * whatever scheme we're using.
2224 */
2225 result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt);
2226
2227 /*
2228 * If we successfully added the command,
2229 * kick the interface to get it moving.
2230 */
2231 if (result == 0 && info->scsi.phase == PHASE_IDLE)
2232 fas216_kick(info);
2233 spin_unlock(&info->host_lock);
2234
2235 fas216_log_target(info, LOG_CONNECT, -1, "queue %s",
2236 result ? "failure" : "success");
2237
2238 return result;
2239 }
2240
2241 DEF_SCSI_QCMD(fas216_queue_command)
2242
2243 /**
2244 * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command
2245 * @SCpnt: Command to wake
2246 *
2247 * Trigger restart of a waiting thread in fas216_command
2248 */
2249 static void fas216_internal_done(struct scsi_cmnd *SCpnt)
2250 {
2251 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2252
2253 fas216_checkmagic(info);
2254
2255 info->internal_done = 1;
2256 }
2257
2258 /**
2259 * fas216_noqueue_command - process a command for the adapter.
2260 * @SCpnt: Command to queue
2261 *
2262 * Queue a command for adapter to process.
2263 * Returns: scsi result code.
2264 * Notes: io_request_lock is held, interrupts are disabled.
2265 */
2266 static int fas216_noqueue_command_lck(struct scsi_cmnd *SCpnt,
2267 void (*done)(struct scsi_cmnd *))
2268 {
2269 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2270
2271 fas216_checkmagic(info);
2272
2273 /*
2274 * We should only be using this if we don't have an interrupt.
2275 * Provide some "incentive" to use the queueing code.
2276 */
2277 BUG_ON(info->scsi.irq);
2278
2279 info->internal_done = 0;
2280 fas216_queue_command_lck(SCpnt, fas216_internal_done);
2281
2282 /*
2283 * This wastes time, since we can't return until the command is
2284 * complete. We can't sleep either since we may get re-entered!
2285 * However, we must re-enable interrupts, or else we'll be
2286 * waiting forever.
2287 */
2288 spin_unlock_irq(info->host->host_lock);
2289
2290 while (!info->internal_done) {
2291 /*
2292 * If we don't have an IRQ, then we must poll the card for
2293 * it's interrupt, and use that to call this driver's
2294 * interrupt routine. That way, we keep the command
2295 * progressing. Maybe we can add some intelligence here
2296 * and go to sleep if we know that the device is going
2297 * to be some time (eg, disconnected).
2298 */
2299 if (fas216_readb(info, REG_STAT) & STAT_INT) {
2300 spin_lock_irq(info->host->host_lock);
2301 fas216_intr(info);
2302 spin_unlock_irq(info->host->host_lock);
2303 }
2304 }
2305
2306 spin_lock_irq(info->host->host_lock);
2307
2308 done(SCpnt);
2309
2310 return 0;
2311 }
2312
2313 DEF_SCSI_QCMD(fas216_noqueue_command)
2314
2315 /*
2316 * Error handler timeout function. Indicate that we timed out,
2317 * and wake up any error handler process so it can continue.
2318 */
2319 static void fas216_eh_timer(unsigned long data)
2320 {
2321 FAS216_Info *info = (FAS216_Info *)data;
2322
2323 fas216_log(info, LOG_ERROR, "error handling timed out\n");
2324
2325 del_timer(&info->eh_timer);
2326
2327 if (info->rst_bus_status == 0)
2328 info->rst_bus_status = -1;
2329 if (info->rst_dev_status == 0)
2330 info->rst_dev_status = -1;
2331
2332 wake_up(&info->eh_wait);
2333 }
2334
2335 enum res_find {
2336 res_failed, /* not found */
2337 res_success, /* command on issue queue */
2338 res_hw_abort /* command on disconnected dev */
2339 };
2340
2341 /**
2342 * fas216_do_abort - decide how to abort a command
2343 * @SCpnt: command to abort
2344 *
2345 * Decide how to abort a command.
2346 * Returns: abort status
2347 */
2348 static enum res_find fas216_find_command(FAS216_Info *info,
2349 struct scsi_cmnd *SCpnt)
2350 {
2351 enum res_find res = res_failed;
2352
2353 if (queue_remove_cmd(&info->queues.issue, SCpnt)) {
2354 /*
2355 * The command was on the issue queue, and has not been
2356 * issued yet. We can remove the command from the queue,
2357 * and acknowledge the abort. Neither the device nor the
2358 * interface know about the command.
2359 */
2360 printk("on issue queue ");
2361
2362 res = res_success;
2363 } else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) {
2364 /*
2365 * The command was on the disconnected queue. We must
2366 * reconnect with the device if possible, and send it
2367 * an abort message.
2368 */
2369 printk("on disconnected queue ");
2370
2371 res = res_hw_abort;
2372 } else if (info->SCpnt == SCpnt) {
2373 printk("executing ");
2374
2375 switch (info->scsi.phase) {
2376 /*
2377 * If the interface is idle, and the command is 'disconnectable',
2378 * then it is the same as on the disconnected queue.
2379 */
2380 case PHASE_IDLE:
2381 if (info->scsi.disconnectable) {
2382 info->scsi.disconnectable = 0;
2383 info->SCpnt = NULL;
2384 res = res_hw_abort;
2385 }
2386 break;
2387
2388 default:
2389 break;
2390 }
2391 } else if (info->origSCpnt == SCpnt) {
2392 /*
2393 * The command will be executed next, but a command
2394 * is currently using the interface. This is similar to
2395 * being on the issue queue, except the busylun bit has
2396 * been set.
2397 */
2398 info->origSCpnt = NULL;
2399 clear_bit(SCpnt->device->id * 8 +
2400 (u8)(SCpnt->device->lun & 0x7), info->busyluns);
2401 printk("waiting for execution ");
2402 res = res_success;
2403 } else
2404 printk("unknown ");
2405
2406 return res;
2407 }
2408
2409 /**
2410 * fas216_eh_abort - abort this command
2411 * @SCpnt: command to abort
2412 *
2413 * Abort this command.
2414 * Returns: FAILED if unable to abort
2415 * Notes: io_request_lock is taken, and irqs are disabled
2416 */
2417 int fas216_eh_abort(struct scsi_cmnd *SCpnt)
2418 {
2419 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2420 int result = FAILED;
2421
2422 fas216_checkmagic(info);
2423
2424 info->stats.aborts += 1;
2425
2426 scmd_printk(KERN_WARNING, SCpnt, "abort command\n");
2427
2428 print_debug_list();
2429 fas216_dumpstate(info);
2430
2431 switch (fas216_find_command(info, SCpnt)) {
2432 /*
2433 * We found the command, and cleared it out. Either
2434 * the command is still known to be executing on the
2435 * target, or the busylun bit is not set.
2436 */
2437 case res_success:
2438 scmd_printk(KERN_WARNING, SCpnt, "abort %p success\n", SCpnt);
2439 result = SUCCESS;
2440 break;
2441
2442 /*
2443 * We need to reconnect to the target and send it an
2444 * ABORT or ABORT_TAG message. We can only do this
2445 * if the bus is free.
2446 */
2447 case res_hw_abort:
2448
2449 /*
2450 * We are unable to abort the command for some reason.
2451 */
2452 default:
2453 case res_failed:
2454 scmd_printk(KERN_WARNING, SCpnt, "abort %p failed\n", SCpnt);
2455 break;
2456 }
2457
2458 return result;
2459 }
2460
2461 /**
2462 * fas216_eh_device_reset - Reset the device associated with this command
2463 * @SCpnt: command specifing device to reset
2464 *
2465 * Reset the device associated with this command.
2466 * Returns: FAILED if unable to reset.
2467 * Notes: We won't be re-entered, so we'll only have one device
2468 * reset on the go at one time.
2469 */
2470 int fas216_eh_device_reset(struct scsi_cmnd *SCpnt)
2471 {
2472 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2473 unsigned long flags;
2474 int i, res = FAILED, target = SCpnt->device->id;
2475
2476 fas216_log(info, LOG_ERROR, "device reset for target %d", target);
2477
2478 spin_lock_irqsave(&info->host_lock, flags);
2479
2480 do {
2481 /*
2482 * If we are currently connected to a device, and
2483 * it is the device we want to reset, there is
2484 * nothing we can do here. Chances are it is stuck,
2485 * and we need a bus reset.
2486 */
2487 if (info->SCpnt && !info->scsi.disconnectable &&
2488 info->SCpnt->device->id == SCpnt->device->id)
2489 break;
2490
2491 /*
2492 * We're going to be resetting this device. Remove
2493 * all pending commands from the driver. By doing
2494 * so, we guarantee that we won't touch the command
2495 * structures except to process the reset request.
2496 */
2497 queue_remove_all_target(&info->queues.issue, target);
2498 queue_remove_all_target(&info->queues.disconnected, target);
2499 if (info->origSCpnt && info->origSCpnt->device->id == target)
2500 info->origSCpnt = NULL;
2501 if (info->reqSCpnt && info->reqSCpnt->device->id == target)
2502 info->reqSCpnt = NULL;
2503 for (i = 0; i < 8; i++)
2504 clear_bit(target * 8 + i, info->busyluns);
2505
2506 /*
2507 * Hijack this SCSI command structure to send
2508 * a bus device reset message to this device.
2509 */
2510 SCpnt->host_scribble = (void *)fas216_devicereset_done;
2511
2512 info->rst_dev_status = 0;
2513 info->rstSCpnt = SCpnt;
2514
2515 if (info->scsi.phase == PHASE_IDLE)
2516 fas216_kick(info);
2517
2518 mod_timer(&info->eh_timer, jiffies + 30 * HZ);
2519 spin_unlock_irqrestore(&info->host_lock, flags);
2520
2521 /*
2522 * Wait up to 30 seconds for the reset to complete.
2523 */
2524 wait_event(info->eh_wait, info->rst_dev_status);
2525
2526 del_timer_sync(&info->eh_timer);
2527 spin_lock_irqsave(&info->host_lock, flags);
2528 info->rstSCpnt = NULL;
2529
2530 if (info->rst_dev_status == 1)
2531 res = SUCCESS;
2532 } while (0);
2533
2534 SCpnt->host_scribble = NULL;
2535 spin_unlock_irqrestore(&info->host_lock, flags);
2536
2537 fas216_log(info, LOG_ERROR, "device reset complete: %s\n",
2538 res == SUCCESS ? "success" : "failed");
2539
2540 return res;
2541 }
2542
2543 /**
2544 * fas216_eh_bus_reset - Reset the bus associated with the command
2545 * @SCpnt: command specifing bus to reset
2546 *
2547 * Reset the bus associated with the command.
2548 * Returns: FAILED if unable to reset.
2549 * Notes: Further commands are blocked.
2550 */
2551 int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt)
2552 {
2553 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2554 unsigned long flags;
2555 struct scsi_device *SDpnt;
2556
2557 fas216_checkmagic(info);
2558 fas216_log(info, LOG_ERROR, "resetting bus");
2559
2560 info->stats.bus_resets += 1;
2561
2562 spin_lock_irqsave(&info->host_lock, flags);
2563
2564 /*
2565 * Stop all activity on this interface.
2566 */
2567 fas216_aborttransfer(info);
2568 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2569
2570 /*
2571 * Clear any pending interrupts.
2572 */
2573 while (fas216_readb(info, REG_STAT) & STAT_INT)
2574 fas216_readb(info, REG_INST);
2575
2576 info->rst_bus_status = 0;
2577
2578 /*
2579 * For each attached hard-reset device, clear out
2580 * all command structures. Leave the running
2581 * command in place.
2582 */
2583 shost_for_each_device(SDpnt, info->host) {
2584 int i;
2585
2586 if (SDpnt->soft_reset)
2587 continue;
2588
2589 queue_remove_all_target(&info->queues.issue, SDpnt->id);
2590 queue_remove_all_target(&info->queues.disconnected, SDpnt->id);
2591 if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id)
2592 info->origSCpnt = NULL;
2593 if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id)
2594 info->reqSCpnt = NULL;
2595 info->SCpnt = NULL;
2596
2597 for (i = 0; i < 8; i++)
2598 clear_bit(SDpnt->id * 8 + i, info->busyluns);
2599 }
2600
2601 info->scsi.phase = PHASE_IDLE;
2602
2603 /*
2604 * Reset the SCSI bus. Device cleanup happens in
2605 * the interrupt handler.
2606 */
2607 fas216_cmd(info, CMD_RESETSCSI);
2608
2609 mod_timer(&info->eh_timer, jiffies + HZ);
2610 spin_unlock_irqrestore(&info->host_lock, flags);
2611
2612 /*
2613 * Wait one second for the interrupt.
2614 */
2615 wait_event(info->eh_wait, info->rst_bus_status);
2616 del_timer_sync(&info->eh_timer);
2617
2618 fas216_log(info, LOG_ERROR, "bus reset complete: %s\n",
2619 info->rst_bus_status == 1 ? "success" : "failed");
2620
2621 return info->rst_bus_status == 1 ? SUCCESS : FAILED;
2622 }
2623
2624 /**
2625 * fas216_init_chip - Initialise FAS216 state after reset
2626 * @info: state structure for interface
2627 *
2628 * Initialise FAS216 state after reset
2629 */
2630 static void fas216_init_chip(FAS216_Info *info)
2631 {
2632 unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7;
2633 fas216_writeb(info, REG_CLKF, clock);
2634 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2635 fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]);
2636 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
2637 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
2638 fas216_writeb(info, REG_SOF, 0);
2639 fas216_writeb(info, REG_STP, info->scsi.async_stp);
2640 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2641 }
2642
2643 /**
2644 * fas216_eh_host_reset - Reset the host associated with this command
2645 * @SCpnt: command specifing host to reset
2646 *
2647 * Reset the host associated with this command.
2648 * Returns: FAILED if unable to reset.
2649 * Notes: io_request_lock is taken, and irqs are disabled
2650 */
2651 int fas216_eh_host_reset(struct scsi_cmnd *SCpnt)
2652 {
2653 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
2654
2655 spin_lock_irq(info->host->host_lock);
2656
2657 fas216_checkmagic(info);
2658
2659 fas216_log(info, LOG_ERROR, "resetting host");
2660
2661 /*
2662 * Reset the SCSI chip.
2663 */
2664 fas216_cmd(info, CMD_RESETCHIP);
2665
2666 /*
2667 * Ugly ugly ugly!
2668 * We need to release the host_lock and enable
2669 * IRQs if we sleep, but we must relock and disable
2670 * IRQs after the sleep.
2671 */
2672 spin_unlock_irq(info->host->host_lock);
2673 msleep(50 * 1000/100);
2674 spin_lock_irq(info->host->host_lock);
2675
2676 /*
2677 * Release the SCSI reset.
2678 */
2679 fas216_cmd(info, CMD_NOP);
2680
2681 fas216_init_chip(info);
2682
2683 spin_unlock_irq(info->host->host_lock);
2684 return SUCCESS;
2685 }
2686
2687 #define TYPE_UNKNOWN 0
2688 #define TYPE_NCR53C90 1
2689 #define TYPE_NCR53C90A 2
2690 #define TYPE_NCR53C9x 3
2691 #define TYPE_Am53CF94 4
2692 #define TYPE_EmFAS216 5
2693 #define TYPE_QLFAS216 6
2694
2695 static char *chip_types[] = {
2696 "unknown",
2697 "NS NCR53C90",
2698 "NS NCR53C90A",
2699 "NS NCR53C9x",
2700 "AMD Am53CF94",
2701 "Emulex FAS216",
2702 "QLogic FAS216"
2703 };
2704
2705 static int fas216_detect_type(FAS216_Info *info)
2706 {
2707 int family, rev;
2708
2709 /*
2710 * Reset the chip.
2711 */
2712 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2713 udelay(50);
2714 fas216_writeb(info, REG_CMD, CMD_NOP);
2715
2716 /*
2717 * Check to see if control reg 2 is present.
2718 */
2719 fas216_writeb(info, REG_CNTL3, 0);
2720 fas216_writeb(info, REG_CNTL2, CNTL2_S2FE);
2721
2722 /*
2723 * If we are unable to read back control reg 2
2724 * correctly, it is not present, and we have a
2725 * NCR53C90.
2726 */
2727 if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE)
2728 return TYPE_NCR53C90;
2729
2730 /*
2731 * Now, check control register 3
2732 */
2733 fas216_writeb(info, REG_CNTL2, 0);
2734 fas216_writeb(info, REG_CNTL3, 0);
2735 fas216_writeb(info, REG_CNTL3, 5);
2736
2737 /*
2738 * If we are unable to read the register back
2739 * correctly, we have a NCR53C90A
2740 */
2741 if (fas216_readb(info, REG_CNTL3) != 5)
2742 return TYPE_NCR53C90A;
2743
2744 /*
2745 * Now read the ID from the chip.
2746 */
2747 fas216_writeb(info, REG_CNTL3, 0);
2748
2749 fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK);
2750 fas216_writeb(info, REG_CNTL3, 0);
2751
2752 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2753 udelay(50);
2754 fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP);
2755
2756 fas216_writeb(info, REG_CNTL2, CNTL2_ENF);
2757 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2758 udelay(50);
2759 fas216_writeb(info, REG_CMD, CMD_NOP);
2760
2761 rev = fas216_readb(info, REG_ID);
2762 family = rev >> 3;
2763 rev &= 7;
2764
2765 switch (family) {
2766 case 0x01:
2767 if (rev == 4)
2768 return TYPE_Am53CF94;
2769 break;
2770
2771 case 0x02:
2772 switch (rev) {
2773 case 2:
2774 return TYPE_EmFAS216;
2775 case 3:
2776 return TYPE_QLFAS216;
2777 }
2778 break;
2779
2780 default:
2781 break;
2782 }
2783 printk("family %x rev %x\n", family, rev);
2784 return TYPE_NCR53C9x;
2785 }
2786
2787 /**
2788 * fas216_reset_state - Initialise driver internal state
2789 * @info: state to initialise
2790 *
2791 * Initialise driver internal state
2792 */
2793 static void fas216_reset_state(FAS216_Info *info)
2794 {
2795 int i;
2796
2797 fas216_checkmagic(info);
2798
2799 fas216_bus_reset(info);
2800
2801 /*
2802 * Clear out all stale info in our state structure
2803 */
2804 memset(info->busyluns, 0, sizeof(info->busyluns));
2805 info->scsi.disconnectable = 0;
2806 info->scsi.aborting = 0;
2807
2808 for (i = 0; i < 8; i++) {
2809 info->device[i].parity_enabled = 0;
2810 info->device[i].parity_check = 1;
2811 }
2812
2813 /*
2814 * Drain all commands on disconnected queue
2815 */
2816 while (queue_remove(&info->queues.disconnected) != NULL);
2817
2818 /*
2819 * Remove executing commands.
2820 */
2821 info->SCpnt = NULL;
2822 info->reqSCpnt = NULL;
2823 info->rstSCpnt = NULL;
2824 info->origSCpnt = NULL;
2825 }
2826
2827 /**
2828 * fas216_init - initialise FAS/NCR/AMD SCSI structures.
2829 * @host: a driver-specific filled-out structure
2830 *
2831 * Initialise FAS/NCR/AMD SCSI structures.
2832 * Returns: 0 on success
2833 */
2834 int fas216_init(struct Scsi_Host *host)
2835 {
2836 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2837
2838 info->magic_start = MAGIC;
2839 info->magic_end = MAGIC;
2840 info->host = host;
2841 info->scsi.cfg[0] = host->this_id | CNTL1_PERE;
2842 info->scsi.cfg[1] = CNTL2_ENF | CNTL2_S2FE;
2843 info->scsi.cfg[2] = info->ifcfg.cntl3 |
2844 CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM;
2845 info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod);
2846
2847 info->rst_dev_status = -1;
2848 info->rst_bus_status = -1;
2849 init_waitqueue_head(&info->eh_wait);
2850 init_timer(&info->eh_timer);
2851 info->eh_timer.data = (unsigned long)info;
2852 info->eh_timer.function = fas216_eh_timer;
2853
2854 spin_lock_init(&info->host_lock);
2855
2856 memset(&info->stats, 0, sizeof(info->stats));
2857
2858 msgqueue_initialise(&info->scsi.msgs);
2859
2860 if (!queue_initialise(&info->queues.issue))
2861 return -ENOMEM;
2862
2863 if (!queue_initialise(&info->queues.disconnected)) {
2864 queue_free(&info->queues.issue);
2865 return -ENOMEM;
2866 }
2867
2868 return 0;
2869 }
2870
2871 /**
2872 * fas216_add - initialise FAS/NCR/AMD SCSI ic.
2873 * @host: a driver-specific filled-out structure
2874 * @dev: parent device
2875 *
2876 * Initialise FAS/NCR/AMD SCSI ic.
2877 * Returns: 0 on success
2878 */
2879 int fas216_add(struct Scsi_Host *host, struct device *dev)
2880 {
2881 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2882 int type, ret;
2883
2884 if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) {
2885 printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n",
2886 info->ifcfg.clockrate);
2887 return -EINVAL;
2888 }
2889
2890 fas216_reset_state(info);
2891 type = fas216_detect_type(info);
2892 info->scsi.type = chip_types[type];
2893
2894 udelay(300);
2895
2896 /*
2897 * Initialise the chip correctly.
2898 */
2899 fas216_init_chip(info);
2900
2901 /*
2902 * Reset the SCSI bus. We don't want to see
2903 * the resulting reset interrupt, so mask it
2904 * out.
2905 */
2906 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR);
2907 fas216_writeb(info, REG_CMD, CMD_RESETSCSI);
2908
2909 /*
2910 * scsi standard says wait 250ms
2911 */
2912 spin_unlock_irq(info->host->host_lock);
2913 msleep(100*1000/100);
2914 spin_lock_irq(info->host->host_lock);
2915
2916 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
2917 fas216_readb(info, REG_INST);
2918
2919 fas216_checkmagic(info);
2920
2921 ret = scsi_add_host(host, dev);
2922 if (ret)
2923 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2924 else
2925 scsi_scan_host(host);
2926
2927 return ret;
2928 }
2929
2930 void fas216_remove(struct Scsi_Host *host)
2931 {
2932 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2933
2934 fas216_checkmagic(info);
2935 scsi_remove_host(host);
2936
2937 fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
2938 scsi_host_put(host);
2939 }
2940
2941 /**
2942 * fas216_release - release all resources for FAS/NCR/AMD SCSI ic.
2943 * @host: a driver-specific filled-out structure
2944 *
2945 * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic.
2946 */
2947 void fas216_release(struct Scsi_Host *host)
2948 {
2949 FAS216_Info *info = (FAS216_Info *)host->hostdata;
2950
2951 queue_free(&info->queues.disconnected);
2952 queue_free(&info->queues.issue);
2953 }
2954
2955 void fas216_print_host(FAS216_Info *info, struct seq_file *m)
2956 {
2957 seq_printf(m,
2958 "\n"
2959 "Chip : %s\n"
2960 " Address: 0x%p\n"
2961 " IRQ : %d\n"
2962 " DMA : %d\n",
2963 info->scsi.type, info->scsi.io_base,
2964 info->scsi.irq, info->scsi.dma);
2965 }
2966
2967 void fas216_print_stats(FAS216_Info *info, struct seq_file *m)
2968 {
2969 seq_printf(m, "\n"
2970 "Command Statistics:\n"
2971 " Queued : %u\n"
2972 " Issued : %u\n"
2973 " Completed : %u\n"
2974 " Reads : %u\n"
2975 " Writes : %u\n"
2976 " Others : %u\n"
2977 " Disconnects: %u\n"
2978 " Aborts : %u\n"
2979 " Bus resets : %u\n"
2980 " Host resets: %u\n",
2981 info->stats.queues, info->stats.removes,
2982 info->stats.fins, info->stats.reads,
2983 info->stats.writes, info->stats.miscs,
2984 info->stats.disconnects, info->stats.aborts,
2985 info->stats.bus_resets, info->stats.host_resets);
2986 }
2987
2988 void fas216_print_devices(FAS216_Info *info, struct seq_file *m)
2989 {
2990 struct fas216_device *dev;
2991 struct scsi_device *scd;
2992
2993 seq_printf(m, "Device/Lun TaggedQ Parity Sync\n");
2994
2995 shost_for_each_device(scd, info->host) {
2996 dev = &info->device[scd->id];
2997 seq_printf(m, " %d/%llu ", scd->id, scd->lun);
2998 if (scd->tagged_supported)
2999 seq_printf(m, "%3sabled(%3d) ",
3000 scd->simple_tags ? "en" : "dis",
3001 scd->current_tag);
3002 else
3003 seq_printf(m, "unsupported ");
3004
3005 seq_printf(m, "%3sabled ", dev->parity_enabled ? "en" : "dis");
3006
3007 if (dev->sof)
3008 seq_printf(m, "offset %d, %d ns\n",
3009 dev->sof, dev->period * 4);
3010 else
3011 seq_printf(m, "async\n");
3012 }
3013 }
3014
3015 EXPORT_SYMBOL(fas216_init);
3016 EXPORT_SYMBOL(fas216_add);
3017 EXPORT_SYMBOL(fas216_queue_command);
3018 EXPORT_SYMBOL(fas216_noqueue_command);
3019 EXPORT_SYMBOL(fas216_intr);
3020 EXPORT_SYMBOL(fas216_remove);
3021 EXPORT_SYMBOL(fas216_release);
3022 EXPORT_SYMBOL(fas216_eh_abort);
3023 EXPORT_SYMBOL(fas216_eh_device_reset);
3024 EXPORT_SYMBOL(fas216_eh_bus_reset);
3025 EXPORT_SYMBOL(fas216_eh_host_reset);
3026 EXPORT_SYMBOL(fas216_print_host);
3027 EXPORT_SYMBOL(fas216_print_stats);
3028 EXPORT_SYMBOL(fas216_print_devices);
3029
3030 MODULE_AUTHOR("Russell King");
3031 MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core");
3032 MODULE_LICENSE("GPL");
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