blob: 9a5629f94f95aba802857a6d5162db4745235c8a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * NCR 5380 generic driver routines. These should make it *trivial*
3 * to implement 5380 SCSI drivers under Linux with a non-trantor
4 * architecture.
5 *
6 * Note that these routines also work with NR53c400 family chips.
7 *
8 * Copyright 1993, Drew Eckhardt
9 * Visionary Computing
10 * (Unix and Linux consulting and custom programming)
11 * drew@colorado.edu
12 * +1 (303) 666-5836
13 *
14 * DISTRIBUTION RELEASE 6.
15 *
16 * For more information, please consult
17 *
18 * NCR 5380 Family
19 * SCSI Protocol Controller
20 * Databook
21 *
22 * NCR Microelectronics
23 * 1635 Aeroplaza Drive
24 * Colorado Springs, CO 80916
25 * 1+ (719) 578-3400
26 * 1+ (800) 334-5454
27 */
28
29/*
30 * $Log: NCR5380.c,v $
31
32 * Revision 1.10 1998/9/2 Alan Cox
Alan Coxfa195af2008-10-27 15:16:36 +000033 * (alan@lxorguk.ukuu.org.uk)
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 * Fixed up the timer lockups reported so far. Things still suck. Looking
35 * forward to 2.3 and per device request queues. Then it'll be possible to
36 * SMP thread this beast and improve life no end.
37
38 * Revision 1.9 1997/7/27 Ronald van Cuijlenborg
39 * (ronald.van.cuijlenborg@tip.nl or nutty@dds.nl)
40 * (hopefully) fixed and enhanced USLEEP
41 * added support for DTC3181E card (for Mustek scanner)
42 *
43
44 * Revision 1.8 Ingmar Baumgart
45 * (ingmar@gonzo.schwaben.de)
46 * added support for NCR53C400a card
47 *
48
49 * Revision 1.7 1996/3/2 Ray Van Tassle (rayvt@comm.mot.com)
50 * added proc_info
51 * added support needed for DTC 3180/3280
52 * fixed a couple of bugs
53 *
54
55 * Revision 1.5 1994/01/19 09:14:57 drew
56 * Fixed udelay() hack that was being used on DATAOUT phases
57 * instead of a proper wait for the final handshake.
58 *
59 * Revision 1.4 1994/01/19 06:44:25 drew
60 * *** empty log message ***
61 *
62 * Revision 1.3 1994/01/19 05:24:40 drew
63 * Added support for TCR LAST_BYTE_SENT bit.
64 *
65 * Revision 1.2 1994/01/15 06:14:11 drew
66 * REAL DMA support, bug fixes.
67 *
68 * Revision 1.1 1994/01/15 06:00:54 drew
69 * Initial revision
70 *
71 */
72
73/*
74 * Further development / testing that should be done :
75 * 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete
76 * code so that everything does the same thing that's done at the
77 * end of a pseudo-DMA read operation.
78 *
79 * 2. Fix REAL_DMA (interrupt driven, polled works fine) -
80 * basically, transfer size needs to be reduced by one
81 * and the last byte read as is done with PSEUDO_DMA.
82 *
83 * 4. Test SCSI-II tagged queueing (I have no devices which support
84 * tagged queueing)
85 *
86 * 5. Test linked command handling code after Eric is ready with
87 * the high level code.
88 */
db9dff32005-04-03 14:53:59 -050089#include <scsi/scsi_dbg.h>
Matthew Wilcox1abfd372005-12-15 16:22:01 -050090#include <scsi/scsi_transport_spi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
viro@ZenIV.linux.org.uk185a7a12005-09-07 23:18:24 +010092#ifndef NDEBUG
93#define NDEBUG 0
94#endif
Randy Dunlapf566a572005-10-02 17:15:29 -070095#ifndef NDEBUG_ABORT
viro@ZenIV.linux.org.uk185a7a12005-09-07 23:18:24 +010096#define NDEBUG_ABORT 0
97#endif
98
Linus Torvalds1da177e2005-04-16 15:20:36 -070099#if (NDEBUG & NDEBUG_LISTS)
100#define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); }
101#define REMOVE(w,x,y,z) {printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, (void*)(w), (void*)(x), (void*)(y), (void*)(z)); if ((x)==(y)) udelay(5); }
102#else
103#define LIST(x,y)
104#define REMOVE(w,x,y,z)
105#endif
106
107#ifndef notyet
108#undef LINKED
109#undef REAL_DMA
110#endif
111
112#ifdef REAL_DMA_POLL
113#undef READ_OVERRUNS
114#define READ_OVERRUNS
115#endif
116
117#ifdef BOARD_REQUIRES_NO_DELAY
118#define io_recovery_delay(x)
119#else
120#define io_recovery_delay(x) udelay(x)
121#endif
122
123/*
124 * Design
125 *
126 * This is a generic 5380 driver. To use it on a different platform,
127 * one simply writes appropriate system specific macros (ie, data
128 * transfer - some PC's will use the I/O bus, 68K's must use
129 * memory mapped) and drops this file in their 'C' wrapper.
130 *
131 * (Note from hch: unfortunately it was not enough for the different
132 * m68k folks and instead of improving this driver they copied it
133 * and hacked it up for their needs. As a consequence they lost
134 * most updates to this driver. Maybe someone will fix all these
135 * drivers to use a common core one day..)
136 *
137 * As far as command queueing, two queues are maintained for
138 * each 5380 in the system - commands that haven't been issued yet,
139 * and commands that are currently executing. This means that an
140 * unlimited number of commands may be queued, letting
141 * more commands propagate from the higher driver levels giving higher
142 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
143 * allowing multiple commands to propagate all the way to a SCSI-II device
144 * while a command is already executing.
145 *
146 *
147 * Issues specific to the NCR5380 :
148 *
149 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
150 * piece of hardware that requires you to sit in a loop polling for
151 * the REQ signal as long as you are connected. Some devices are
152 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
153 * while doing long seek operations.
154 *
155 * The workaround for this is to keep track of devices that have
156 * disconnected. If the device hasn't disconnected, for commands that
157 * should disconnect, we do something like
158 *
159 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
160 *
161 * Some tweaking of N and M needs to be done. An algorithm based
162 * on "time to data" would give the best results as long as short time
163 * to datas (ie, on the same track) were considered, however these
164 * broken devices are the exception rather than the rule and I'd rather
165 * spend my time optimizing for the normal case.
166 *
167 * Architecture :
168 *
169 * At the heart of the design is a coroutine, NCR5380_main,
170 * which is started from a workqueue for each NCR5380 host in the
171 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by
172 * removing the commands from the issue queue and calling
173 * NCR5380_select() if a nexus is not established.
174 *
175 * Once a nexus is established, the NCR5380_information_transfer()
176 * phase goes through the various phases as instructed by the target.
177 * if the target goes into MSG IN and sends a DISCONNECT message,
178 * the command structure is placed into the per instance disconnected
179 * queue, and NCR5380_main tries to find more work. If the target is
180 * idle for too long, the system will try to sleep.
181 *
182 * If a command has disconnected, eventually an interrupt will trigger,
183 * calling NCR5380_intr() which will in turn call NCR5380_reselect
184 * to reestablish a nexus. This will run main if necessary.
185 *
186 * On command termination, the done function will be called as
187 * appropriate.
188 *
189 * SCSI pointers are maintained in the SCp field of SCSI command
190 * structures, being initialized after the command is connected
191 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
192 * Note that in violation of the standard, an implicit SAVE POINTERS operation
193 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
194 */
195
196/*
197 * Using this file :
198 * This file a skeleton Linux SCSI driver for the NCR 5380 series
199 * of chips. To use it, you write an architecture specific functions
200 * and macros and include this file in your driver.
201 *
202 * These macros control options :
203 * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be
204 * defined.
205 *
206 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
207 * for commands that return with a CHECK CONDITION status.
208 *
209 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
210 * transceivers.
211 *
212 * DONT_USE_INTR - if defined, never use interrupts, even if we probe or
213 * override-configure an IRQ.
214 *
215 * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512
216 * bytes at a time. Since interrupts are disabled by default during
217 * these transfers, we might need this to give reasonable interrupt
218 * service time if the transfer size gets too large.
219 *
220 * LINKED - if defined, linked commands are supported.
221 *
222 * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases.
223 *
224 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
225 *
226 * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't
227 * rely on phase mismatch and EOP interrupts to determine end
228 * of phase.
229 *
230 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You
231 * only really want to use this if you're having a problem with
232 * dropped characters during high speed communications, and even
233 * then, you're going to be better off twiddling with transfersize
234 * in the high level code.
235 *
236 * Defaults for these will be provided although the user may want to adjust
237 * these to allocate CPU resources to the SCSI driver or "real" code.
238 *
239 * USLEEP_SLEEP - amount of time, in jiffies, to sleep
240 *
241 * USLEEP_POLL - amount of time, in jiffies, to poll
242 *
243 * These macros MUST be defined :
244 * NCR5380_local_declare() - declare any local variables needed for your
245 * transfer routines.
246 *
247 * NCR5380_setup(instance) - initialize any local variables needed from a given
248 * instance of the host adapter for NCR5380_{read,write,pread,pwrite}
249 *
250 * NCR5380_read(register) - read from the specified register
251 *
252 * NCR5380_write(register, value) - write to the specific register
253 *
254 * NCR5380_implementation_fields - additional fields needed for this
255 * specific implementation of the NCR5380
256 *
257 * Either real DMA *or* pseudo DMA may be implemented
258 * REAL functions :
259 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
260 * Note that the DMA setup functions should return the number of bytes
261 * that they were able to program the controller for.
262 *
263 * Also note that generic i386/PC versions of these macros are
264 * available as NCR5380_i386_dma_write_setup,
265 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
266 *
267 * NCR5380_dma_write_setup(instance, src, count) - initialize
268 * NCR5380_dma_read_setup(instance, dst, count) - initialize
269 * NCR5380_dma_residual(instance); - residual count
270 *
271 * PSEUDO functions :
272 * NCR5380_pwrite(instance, src, count)
273 * NCR5380_pread(instance, dst, count);
274 *
275 * The generic driver is initialized by calling NCR5380_init(instance),
276 * after setting the appropriate host specific fields and ID. If the
277 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
278 * possible) function may be used.
279 */
280
281static int do_abort(struct Scsi_Host *host);
282static void do_reset(struct Scsi_Host *host);
283
284/*
285 * initialize_SCp - init the scsi pointer field
286 * @cmd: command block to set up
287 *
288 * Set up the internal fields in the SCSI command.
289 */
290
291static __inline__ void initialize_SCp(Scsi_Cmnd * cmd)
292{
293 /*
294 * Initialize the Scsi Pointer field so that all of the commands in the
295 * various queues are valid.
296 */
297
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200298 if (scsi_bufflen(cmd)) {
299 cmd->SCp.buffer = scsi_sglist(cmd);
300 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
Jens Axboe45711f12007-10-22 21:19:53 +0200301 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 cmd->SCp.this_residual = cmd->SCp.buffer->length;
303 } else {
304 cmd->SCp.buffer = NULL;
305 cmd->SCp.buffers_residual = 0;
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200306 cmd->SCp.ptr = NULL;
307 cmd->SCp.this_residual = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 }
309}
310
311/**
312 * NCR5380_poll_politely - wait for NCR5380 status bits
313 * @instance: controller to poll
314 * @reg: 5380 register to poll
315 * @bit: Bitmask to check
316 * @val: Value required to exit
317 *
318 * Polls the NCR5380 in a reasonably efficient manner waiting for
319 * an event to occur, after a short quick poll we begin giving the
320 * CPU back in non IRQ contexts
321 *
322 * Returns the value of the register or a negative error code.
323 */
324
325static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t)
326{
327 NCR5380_local_declare();
328 int n = 500; /* At about 8uS a cycle for the cpu access */
329 unsigned long end = jiffies + t;
330 int r;
331
332 NCR5380_setup(instance);
333
334 while( n-- > 0)
335 {
336 r = NCR5380_read(reg);
337 if((r & bit) == val)
338 return 0;
339 cpu_relax();
340 }
341
342 /* t time yet ? */
343 while(time_before(jiffies, end))
344 {
345 r = NCR5380_read(reg);
346 if((r & bit) == val)
347 return 0;
348 if(!in_interrupt())
Amol Lad730a6462007-05-23 14:41:37 -0700349 cond_resched();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 else
351 cpu_relax();
352 }
353 return -ETIMEDOUT;
354}
355
356static struct {
357 unsigned char value;
358 const char *name;
Andrew Morton702809c2007-05-23 14:41:56 -0700359} phases[] __maybe_unused = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 {PHASE_DATAOUT, "DATAOUT"},
361 {PHASE_DATAIN, "DATAIN"},
362 {PHASE_CMDOUT, "CMDOUT"},
363 {PHASE_STATIN, "STATIN"},
364 {PHASE_MSGOUT, "MSGOUT"},
365 {PHASE_MSGIN, "MSGIN"},
366 {PHASE_UNKNOWN, "UNKNOWN"}
367};
368
viro@ZenIV.linux.org.uk185a7a12005-09-07 23:18:24 +0100369#if NDEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370static struct {
371 unsigned char mask;
372 const char *name;
373} signals[] = {
374 {SR_DBP, "PARITY"},
375 {SR_RST, "RST"},
376 {SR_BSY, "BSY"},
377 {SR_REQ, "REQ"},
378 {SR_MSG, "MSG"},
379 {SR_CD, "CD"},
380 {SR_IO, "IO"},
381 {SR_SEL, "SEL"},
382 {0, NULL}
383},
384basrs[] = {
385 {BASR_ATN, "ATN"},
386 {BASR_ACK, "ACK"},
387 {0, NULL}
388},
389icrs[] = {
390 {ICR_ASSERT_RST, "ASSERT RST"},
391 {ICR_ASSERT_ACK, "ASSERT ACK"},
392 {ICR_ASSERT_BSY, "ASSERT BSY"},
393 {ICR_ASSERT_SEL, "ASSERT SEL"},
394 {ICR_ASSERT_ATN, "ASSERT ATN"},
395 {ICR_ASSERT_DATA, "ASSERT DATA"},
396 {0, NULL}
397},
398mrs[] = {
399 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"},
400 {MR_TARGET, "MODE TARGET"},
401 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"},
402 {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"},
403 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
404 {MR_DMA_MODE, "MODE DMA"},
405 {MR_ARBITRATE, "MODE ARBITRATION"},
406 {0, NULL}
407};
408
409/**
410 * NCR5380_print - print scsi bus signals
411 * @instance: adapter state to dump
412 *
413 * Print the SCSI bus signals for debugging purposes
414 *
415 * Locks: caller holds hostdata lock (not essential)
416 */
417
418static void NCR5380_print(struct Scsi_Host *instance)
419{
420 NCR5380_local_declare();
421 unsigned char status, data, basr, mr, icr, i;
422 NCR5380_setup(instance);
423
424 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
425 status = NCR5380_read(STATUS_REG);
426 mr = NCR5380_read(MODE_REG);
427 icr = NCR5380_read(INITIATOR_COMMAND_REG);
428 basr = NCR5380_read(BUS_AND_STATUS_REG);
429
430 printk("STATUS_REG: %02x ", status);
431 for (i = 0; signals[i].mask; ++i)
432 if (status & signals[i].mask)
433 printk(",%s", signals[i].name);
434 printk("\nBASR: %02x ", basr);
435 for (i = 0; basrs[i].mask; ++i)
436 if (basr & basrs[i].mask)
437 printk(",%s", basrs[i].name);
438 printk("\nICR: %02x ", icr);
439 for (i = 0; icrs[i].mask; ++i)
440 if (icr & icrs[i].mask)
441 printk(",%s", icrs[i].name);
442 printk("\nMODE: %02x ", mr);
443 for (i = 0; mrs[i].mask; ++i)
444 if (mr & mrs[i].mask)
445 printk(",%s", mrs[i].name);
446 printk("\n");
447}
448
449
450/*
451 * NCR5380_print_phase - show SCSI phase
452 * @instance: adapter to dump
453 *
454 * Print the current SCSI phase for debugging purposes
455 *
456 * Locks: none
457 */
458
459static void NCR5380_print_phase(struct Scsi_Host *instance)
460{
461 NCR5380_local_declare();
462 unsigned char status;
463 int i;
464 NCR5380_setup(instance);
465
466 status = NCR5380_read(STATUS_REG);
467 if (!(status & SR_REQ))
468 printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no);
469 else {
470 for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i);
471 printk("scsi%d : phase %s\n", instance->host_no, phases[i].name);
472 }
473}
474#endif
475
476/*
477 * These need tweaking, and would probably work best as per-device
478 * flags initialized differently for disk, tape, cd, etc devices.
479 * People with broken devices are free to experiment as to what gives
480 * the best results for them.
481 *
482 * USLEEP_SLEEP should be a minimum seek time.
483 *
484 * USLEEP_POLL should be a maximum rotational latency.
485 */
486#ifndef USLEEP_SLEEP
487/* 20 ms (reasonable hard disk speed) */
488#define USLEEP_SLEEP (20*HZ/1000)
489#endif
490/* 300 RPM (floppy speed) */
491#ifndef USLEEP_POLL
492#define USLEEP_POLL (200*HZ/1000)
493#endif
494#ifndef USLEEP_WAITLONG
495/* RvC: (reasonable time to wait on select error) */
496#define USLEEP_WAITLONG USLEEP_SLEEP
497#endif
498
499/*
500 * Function : int should_disconnect (unsigned char cmd)
501 *
Andreas Mohrd6e05ed2006-06-26 18:35:02 +0200502 * Purpose : decide whether a command would normally disconnect or
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 * not, since if it won't disconnect we should go to sleep.
504 *
505 * Input : cmd - opcode of SCSI command
506 *
507 * Returns : DISCONNECT_LONG if we should disconnect for a really long
508 * time (ie always, sleep, look for REQ active, sleep),
509 * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal
510 * time-to-data delay, DISCONNECT_NONE if this command would return
511 * immediately.
512 *
513 * Future sleep algorithms based on time to data can exploit
514 * something like this so they can differentiate between "normal"
515 * (ie, read, write, seek) and unusual commands (ie, * format).
516 *
517 * Note : We don't deal with commands that handle an immediate disconnect,
518 *
519 */
520
521static int should_disconnect(unsigned char cmd)
522{
523 switch (cmd) {
524 case READ_6:
525 case WRITE_6:
526 case SEEK_6:
527 case READ_10:
528 case WRITE_10:
529 case SEEK_10:
530 return DISCONNECT_TIME_TO_DATA;
531 case FORMAT_UNIT:
532 case SEARCH_HIGH:
533 case SEARCH_LOW:
534 case SEARCH_EQUAL:
535 return DISCONNECT_LONG;
536 default:
537 return DISCONNECT_NONE;
538 }
539}
540
541static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout)
542{
543 hostdata->time_expires = jiffies + timeout;
544 schedule_delayed_work(&hostdata->coroutine, timeout);
545}
546
547
548static int probe_irq __initdata = 0;
549
550/**
551 * probe_intr - helper for IRQ autoprobe
552 * @irq: interrupt number
553 * @dev_id: unused
554 * @regs: unused
555 *
556 * Set a flag to indicate the IRQ in question was received. This is
557 * used by the IRQ probe code.
558 */
559
David Howells7d12e782006-10-05 14:55:46 +0100560static irqreturn_t __init probe_intr(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561{
562 probe_irq = irq;
563 return IRQ_HANDLED;
564}
565
566/**
567 * NCR5380_probe_irq - find the IRQ of an NCR5380
568 * @instance: NCR5380 controller
569 * @possible: bitmask of ISA IRQ lines
570 *
571 * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ
572 * and then looking to see what interrupt actually turned up.
573 *
574 * Locks: none, irqs must be enabled on entry
575 */
576
Andrew Morton702809c2007-05-23 14:41:56 -0700577static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance,
578 int possible)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579{
580 NCR5380_local_declare();
581 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
582 unsigned long timeout;
583 int trying_irqs, i, mask;
584 NCR5380_setup(instance);
585
586 for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1)
Thomas Gleixner1d6f3592006-07-01 19:29:42 -0700587 if ((mask & possible) && (request_irq(i, &probe_intr, IRQF_DISABLED, "NCR-probe", NULL) == 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 trying_irqs |= mask;
589
590 timeout = jiffies + (250 * HZ / 1000);
591 probe_irq = SCSI_IRQ_NONE;
592
593 /*
594 * A interrupt is triggered whenever BSY = false, SEL = true
595 * and a bit set in the SELECT_ENABLE_REG is asserted on the
596 * SCSI bus.
597 *
598 * Note that the bus is only driven when the phase control signals
599 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that
600 * to zero.
601 */
602
603 NCR5380_write(TARGET_COMMAND_REG, 0);
604 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
605 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
606 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL);
607
608 while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout))
Nishanth Aravamudana9a30472005-11-07 01:01:20 -0800609 schedule_timeout_uninterruptible(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
611 NCR5380_write(SELECT_ENABLE_REG, 0);
612 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
613
614 for (i = 0, mask = 1; i < 16; ++i, mask <<= 1)
615 if (trying_irqs & mask)
616 free_irq(i, NULL);
617
618 return probe_irq;
619}
620
621/**
622 * NCR58380_print_options - show options
623 * @instance: unused for now
624 *
625 * Called by probe code indicating the NCR5380 driver options that
626 * were selected. At some point this will switch to runtime options
627 * read from the adapter in question
628 *
629 * Locks: none
630 */
631
Andrew Morton702809c2007-05-23 14:41:56 -0700632static void __init __maybe_unused
633NCR5380_print_options(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634{
635 printk(" generic options"
636#ifdef AUTOPROBE_IRQ
637 " AUTOPROBE_IRQ"
638#endif
639#ifdef AUTOSENSE
640 " AUTOSENSE"
641#endif
642#ifdef DIFFERENTIAL
643 " DIFFERENTIAL"
644#endif
645#ifdef REAL_DMA
646 " REAL DMA"
647#endif
648#ifdef REAL_DMA_POLL
649 " REAL DMA POLL"
650#endif
651#ifdef PARITY
652 " PARITY"
653#endif
654#ifdef PSEUDO_DMA
655 " PSEUDO DMA"
656#endif
657#ifdef UNSAFE
658 " UNSAFE "
659#endif
660 );
661 printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP);
662 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
663 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) {
664 printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE);
665 }
666}
667
668/**
669 * NCR5380_print_status - dump controller info
670 * @instance: controller to dump
671 *
672 * Print commands in the various queues, called from NCR5380_abort
673 * and NCR5380_debug to aid debugging.
674 *
675 * Locks: called functions disable irqs
676 */
677
678static void NCR5380_print_status(struct Scsi_Host *instance)
679{
680 NCR5380_dprint(NDEBUG_ANY, instance);
681 NCR5380_dprint_phase(NDEBUG_ANY, instance);
682}
683
684/******************************************/
685/*
686 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
687 *
688 * *buffer: I/O buffer
689 * **start: if inout == FALSE pointer into buffer where user read should start
690 * offset: current offset
691 * length: length of buffer
692 * hostno: Scsi_Host host_no
693 * inout: TRUE - user is writing; FALSE - user is reading
694 *
695 * Return the number of bytes read from or written
696 */
697
698#undef SPRINTF
699#define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0)
700static
701char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length);
702static
703char *lprint_command(unsigned char *cmd, char *pos, char *buffer, int len);
704static
705char *lprint_opcode(int opcode, char *pos, char *buffer, int length);
706
Andrew Morton702809c2007-05-23 14:41:56 -0700707static int __maybe_unused NCR5380_proc_info(struct Scsi_Host *instance,
708 char *buffer, char **start, off_t offset, int length, int inout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709{
710 char *pos = buffer;
711 struct NCR5380_hostdata *hostdata;
712 Scsi_Cmnd *ptr;
713
714 hostdata = (struct NCR5380_hostdata *) instance->hostdata;
715
716 if (inout) { /* Has data been written to the file ? */
717#ifdef DTC_PUBLIC_RELEASE
718 dtc_wmaxi = dtc_maxi = 0;
719#endif
720#ifdef PAS16_PUBLIC_RELEASE
721 pas_wmaxi = pas_maxi = 0;
722#endif
723 return (-ENOSYS); /* Currently this is a no-op */
724 }
725 SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE);
726 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400)
727 SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE);
728#ifdef DTC_PUBLIC_RELEASE
729 SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE);
730#endif
731#ifdef T128_PUBLIC_RELEASE
732 SPRINTF("T128 release %d", T128_PUBLIC_RELEASE);
733#endif
734#ifdef GENERIC_NCR5380_PUBLIC_RELEASE
735 SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE);
736#endif
737#ifdef PAS16_PUBLIC_RELEASE
738 SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE);
739#endif
740
741 SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base);
742 SPRINTF("io_port: %04x ", (int) instance->io_port);
743 if (instance->irq == SCSI_IRQ_NONE)
744 SPRINTF("IRQ: None.\n");
745 else
746 SPRINTF("IRQ: %d.\n", instance->irq);
747
748#ifdef DTC_PUBLIC_RELEASE
749 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi);
750#endif
751#ifdef PAS16_PUBLIC_RELEASE
752 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi);
753#endif
754 spin_lock_irq(instance->host_lock);
755 if (!hostdata->connected)
756 SPRINTF("scsi%d: no currently connected command\n", instance->host_no);
757 else
758 pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, pos, buffer, length);
759 SPRINTF("scsi%d: issue_queue\n", instance->host_no);
760 for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
761 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
762
763 SPRINTF("scsi%d: disconnected_queue\n", instance->host_no);
764 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
765 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
766 spin_unlock_irq(instance->host_lock);
767
768 *start = buffer;
769 if (pos - buffer < offset)
770 return 0;
771 else if (pos - buffer - offset < length)
772 return pos - buffer - offset;
773 return length;
774}
775
776static char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length)
777{
778 SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun);
779 SPRINTF(" command = ");
780 pos = lprint_command(cmd->cmnd, pos, buffer, length);
781 return (pos);
782}
783
784static char *lprint_command(unsigned char *command, char *pos, char *buffer, int length)
785{
786 int i, s;
787 pos = lprint_opcode(command[0], pos, buffer, length);
788 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
789 SPRINTF("%02x ", command[i]);
790 SPRINTF("\n");
791 return (pos);
792}
793
794static char *lprint_opcode(int opcode, char *pos, char *buffer, int length)
795{
796 SPRINTF("%2d (0x%02x)", opcode, opcode);
797 return (pos);
798}
799
800
801/**
802 * NCR5380_init - initialise an NCR5380
803 * @instance: adapter to configure
804 * @flags: control flags
805 *
806 * Initializes *instance and corresponding 5380 chip,
807 * with flags OR'd into the initial flags value.
808 *
809 * Notes : I assume that the host, hostno, and id bits have been
810 * set correctly. I don't care about the irq and other fields.
811 *
812 * Returns 0 for success
813 *
814 * Locks: interrupts must be enabled when we are called
815 */
816
817static int __devinit NCR5380_init(struct Scsi_Host *instance, int flags)
818{
819 NCR5380_local_declare();
820 int i, pass;
821 unsigned long timeout;
822 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
823
824 if(in_interrupt())
825 printk(KERN_ERR "NCR5380_init called with interrupts off!\n");
826 /*
827 * On NCR53C400 boards, NCR5380 registers are mapped 8 past
828 * the base address.
829 */
830
831#ifdef NCR53C400
832 if (flags & FLAG_NCR53C400)
833 instance->NCR5380_instance_name += NCR53C400_address_adjust;
834#endif
835
836 NCR5380_setup(instance);
837
838 hostdata->aborted = 0;
839 hostdata->id_mask = 1 << instance->this_id;
840 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
841 if (i > hostdata->id_mask)
842 hostdata->id_higher_mask |= i;
843 for (i = 0; i < 8; ++i)
844 hostdata->busy[i] = 0;
845#ifdef REAL_DMA
846 hostdata->dmalen = 0;
847#endif
848 hostdata->targets_present = 0;
849 hostdata->connected = NULL;
850 hostdata->issue_queue = NULL;
851 hostdata->disconnected_queue = NULL;
852
David Howellsc4028952006-11-22 14:57:56 +0000853 INIT_DELAYED_WORK(&hostdata->coroutine, NCR5380_main);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854
855#ifdef NCR5380_STATS
856 for (i = 0; i < 8; ++i) {
857 hostdata->time_read[i] = 0;
858 hostdata->time_write[i] = 0;
859 hostdata->bytes_read[i] = 0;
860 hostdata->bytes_write[i] = 0;
861 }
862 hostdata->timebase = 0;
863 hostdata->pendingw = 0;
864 hostdata->pendingr = 0;
865#endif
866
867 /* The CHECK code seems to break the 53C400. Will check it later maybe */
868 if (flags & FLAG_NCR53C400)
869 hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags;
870 else
871 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags;
872
873 hostdata->host = instance;
874 hostdata->time_expires = 0;
875
876#ifndef AUTOSENSE
877 if ((instance->cmd_per_lun > 1) || instance->can_queue > 1)
878 printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n"
879 " be incorrectly cleared.\n", instance->host_no);
880#endif /* def AUTOSENSE */
881
882 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
883 NCR5380_write(MODE_REG, MR_BASE);
884 NCR5380_write(TARGET_COMMAND_REG, 0);
885 NCR5380_write(SELECT_ENABLE_REG, 0);
886
887#ifdef NCR53C400
888 if (hostdata->flags & FLAG_NCR53C400) {
889 NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
890 }
891#endif
892
893 /*
894 * Detect and correct bus wedge problems.
895 *
896 * If the system crashed, it may have crashed in a state
897 * where a SCSI command was still executing, and the
898 * SCSI bus is not in a BUS FREE STATE.
899 *
900 * If this is the case, we'll try to abort the currently
901 * established nexus which we know nothing about, and that
902 * failing, do a hard reset of the SCSI bus
903 */
904
905 for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) {
906 switch (pass) {
907 case 1:
908 case 3:
909 case 5:
910 printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no);
911 timeout = jiffies + 5 * HZ;
912 NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ);
913 break;
914 case 2:
915 printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no);
916 do_abort(instance);
917 break;
918 case 4:
919 printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no);
920 do_reset(instance);
921 break;
922 case 6:
923 printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no);
924 return -ENXIO;
925 }
926 }
927 return 0;
928}
929
930/**
931 * NCR5380_exit - remove an NCR5380
932 * @instance: adapter to remove
933 */
934
Randy Dunlapa43cf0f2008-01-22 21:39:33 -0800935static void NCR5380_exit(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936{
937 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
938
939 cancel_delayed_work(&hostdata->coroutine);
940 flush_scheduled_work();
941}
942
943/**
944 * NCR5380_queue_command - queue a command
945 * @cmd: SCSI command
946 * @done: completion handler
947 *
948 * cmd is added to the per instance issue_queue, with minor
949 * twiddling done to the host specific fields of cmd. If the
950 * main coroutine is not running, it is restarted.
951 *
952 * Locks: host lock taken by caller
953 */
954
Jeff Garzikf2812332010-11-16 02:10:29 -0500955static int NCR5380_queue_command_lck(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956{
957 struct Scsi_Host *instance = cmd->device->host;
958 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
959 Scsi_Cmnd *tmp;
960
961#if (NDEBUG & NDEBUG_NO_WRITE)
962 switch (cmd->cmnd[0]) {
963 case WRITE_6:
964 case WRITE_10:
965 printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no);
966 cmd->result = (DID_ERROR << 16);
967 done(cmd);
968 return 0;
969 }
970#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
971
972#ifdef NCR5380_STATS
973 switch (cmd->cmnd[0]) {
974 case WRITE:
975 case WRITE_6:
976 case WRITE_10:
977 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200978 hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 hostdata->pendingw++;
980 break;
981 case READ:
982 case READ_6:
983 case READ_10:
984 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200985 hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 hostdata->pendingr++;
987 break;
988 }
989#endif
990
991 /*
992 * We use the host_scribble field as a pointer to the next command
993 * in a queue
994 */
995
996 cmd->host_scribble = NULL;
997 cmd->scsi_done = done;
998 cmd->result = 0;
999
1000 /*
1001 * Insert the cmd into the issue queue. Note that REQUEST SENSE
1002 * commands are added to the head of the queue since any command will
1003 * clear the contingent allegiance condition that exists and the
1004 * sense data is only guaranteed to be valid while the condition exists.
1005 */
1006
1007 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
1008 LIST(cmd, hostdata->issue_queue);
1009 cmd->host_scribble = (unsigned char *) hostdata->issue_queue;
1010 hostdata->issue_queue = cmd;
1011 } else {
1012 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble);
1013 LIST(cmd, tmp);
1014 tmp->host_scribble = (unsigned char *) cmd;
1015 }
1016 dprintk(NDEBUG_QUEUES, ("scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"));
1017
1018 /* Run the coroutine if it isn't already running. */
1019 /* Kick off command processing */
David Howellsc4028952006-11-22 14:57:56 +00001020 schedule_delayed_work(&hostdata->coroutine, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 return 0;
1022}
1023
Jeff Garzikf2812332010-11-16 02:10:29 -05001024static DEF_SCSI_QCMD(NCR5380_queue_command)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025
1026/**
1027 * NCR5380_main - NCR state machines
1028 *
1029 * NCR5380_main is a coroutine that runs as long as more work can
1030 * be done on the NCR5380 host adapters in a system. Both
1031 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1032 * in case it is not running.
1033 *
1034 * Locks: called as its own thread with no locks held. Takes the
1035 * host lock and called routines may take the isa dma lock.
1036 */
1037
David Howellsc4028952006-11-22 14:57:56 +00001038static void NCR5380_main(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039{
David Howellsc4028952006-11-22 14:57:56 +00001040 struct NCR5380_hostdata *hostdata =
1041 container_of(work, struct NCR5380_hostdata, coroutine.work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 struct Scsi_Host *instance = hostdata->host;
1043 Scsi_Cmnd *tmp, *prev;
1044 int done;
1045
1046 spin_lock_irq(instance->host_lock);
1047 do {
1048 /* Lock held here */
1049 done = 1;
1050 if (!hostdata->connected && !hostdata->selecting) {
1051 dprintk(NDEBUG_MAIN, ("scsi%d : not connected\n", instance->host_no));
1052 /*
1053 * Search through the issue_queue for a command destined
1054 * for a target that's not busy.
1055 */
1056 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
1057 {
1058 if (prev != tmp)
1059 dprintk(NDEBUG_LISTS, ("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun));
1060 /* When we find one, remove it from the issue queue. */
1061 if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) {
1062 if (prev) {
1063 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
1064 prev->host_scribble = tmp->host_scribble;
1065 } else {
1066 REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble);
1067 hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble;
1068 }
1069 tmp->host_scribble = NULL;
1070
1071 /*
1072 * Attempt to establish an I_T_L nexus here.
1073 * On success, instance->hostdata->connected is set.
1074 * On failure, we must add the command back to the
1075 * issue queue so we can keep trying.
1076 */
1077 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main() : command for target %d lun %d removed from issue_queue\n", instance->host_no, tmp->target, tmp->lun));
1078
1079 /*
1080 * A successful selection is defined as one that
1081 * leaves us with the command connected and
1082 * in hostdata->connected, OR has terminated the
1083 * command.
1084 *
1085 * With successful commands, we fall through
1086 * and see if we can do an information transfer,
1087 * with failures we will restart.
1088 */
1089 hostdata->selecting = NULL;
1090 /* RvC: have to preset this to indicate a new command is being performed */
1091
1092 if (!NCR5380_select(instance, tmp,
1093 /*
1094 * REQUEST SENSE commands are issued without tagged
1095 * queueing, even on SCSI-II devices because the
1096 * contingent allegiance condition exists for the
1097 * entire unit.
1098 */
1099 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
1100 break;
1101 } else {
1102 LIST(tmp, hostdata->issue_queue);
1103 tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1104 hostdata->issue_queue = tmp;
1105 done = 0;
1106 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no));
1107 }
1108 /* lock held here still */
1109 } /* if target/lun is not busy */
1110 } /* for */
1111 /* exited locked */
1112 } /* if (!hostdata->connected) */
1113 if (hostdata->selecting) {
1114 tmp = (Scsi_Cmnd *) hostdata->selecting;
1115 /* Selection will drop and retake the lock */
1116 if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
1117 /* Ok ?? */
1118 } else {
1119 /* RvC: device failed, so we wait a long time
1120 this is needed for Mustek scanners, that
1121 do not respond to commands immediately
1122 after a scan */
1123 printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id);
1124 LIST(tmp, hostdata->issue_queue);
1125 tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1126 hostdata->issue_queue = tmp;
1127 NCR5380_set_timer(hostdata, USLEEP_WAITLONG);
1128 }
1129 } /* if hostdata->selecting */
1130 if (hostdata->connected
1131#ifdef REAL_DMA
1132 && !hostdata->dmalen
1133#endif
1134 && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies))
1135 ) {
1136 dprintk(NDEBUG_MAIN, ("scsi%d : main() : performing information transfer\n", instance->host_no));
1137 NCR5380_information_transfer(instance);
1138 dprintk(NDEBUG_MAIN, ("scsi%d : main() : done set false\n", instance->host_no));
1139 done = 0;
1140 } else
1141 break;
1142 } while (!done);
1143
1144 spin_unlock_irq(instance->host_lock);
1145}
1146
1147#ifndef DONT_USE_INTR
1148
1149/**
1150 * NCR5380_intr - generic NCR5380 irq handler
1151 * @irq: interrupt number
1152 * @dev_id: device info
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 *
1154 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1155 * from the disconnected queue, and restarting NCR5380_main()
1156 * as required.
1157 *
1158 * Locks: takes the needed instance locks
1159 */
1160
Jeff Garzikbaa9aac2007-12-13 16:14:14 -08001161static irqreturn_t NCR5380_intr(int dummy, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162{
1163 NCR5380_local_declare();
Jeff Garzikbaa9aac2007-12-13 16:14:14 -08001164 struct Scsi_Host *instance = dev_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1166 int done;
1167 unsigned char basr;
1168 unsigned long flags;
1169
Jeff Garzikbaa9aac2007-12-13 16:14:14 -08001170 dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n",
1171 instance->irq));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172
1173 do {
1174 done = 1;
1175 spin_lock_irqsave(instance->host_lock, flags);
1176 /* Look for pending interrupts */
1177 NCR5380_setup(instance);
1178 basr = NCR5380_read(BUS_AND_STATUS_REG);
1179 /* XXX dispatch to appropriate routine if found and done=0 */
1180 if (basr & BASR_IRQ) {
1181 NCR5380_dprint(NDEBUG_INTR, instance);
1182 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1183 done = 0;
1184 dprintk(NDEBUG_INTR, ("scsi%d : SEL interrupt\n", instance->host_no));
1185 NCR5380_reselect(instance);
1186 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1187 } else if (basr & BASR_PARITY_ERROR) {
1188 dprintk(NDEBUG_INTR, ("scsi%d : PARITY interrupt\n", instance->host_no));
1189 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1190 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1191 dprintk(NDEBUG_INTR, ("scsi%d : RESET interrupt\n", instance->host_no));
1192 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1193 } else {
1194#if defined(REAL_DMA)
1195 /*
1196 * We should only get PHASE MISMATCH and EOP interrupts
1197 * if we have DMA enabled, so do a sanity check based on
1198 * the current setting of the MODE register.
1199 */
1200
1201 if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) {
1202 int transfered;
1203
1204 if (!hostdata->connected)
1205 panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno);
1206
1207 transfered = (hostdata->dmalen - NCR5380_dma_residual(instance));
1208 hostdata->connected->SCp.this_residual -= transferred;
1209 hostdata->connected->SCp.ptr += transferred;
1210 hostdata->dmalen = 0;
1211
1212 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1213
1214 /* FIXME: we need to poll briefly then defer a workqueue task ! */
1215 NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ);
1216
1217 NCR5380_write(MODE_REG, MR_BASE);
1218 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1219 }
1220#else
1221 dprintk(NDEBUG_INTR, ("scsi : unknown interrupt, BASR 0x%X, MR 0x%X, SR 0x%x\n", basr, NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG)));
1222 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1223#endif
1224 }
1225 } /* if BASR_IRQ */
1226 spin_unlock_irqrestore(instance->host_lock, flags);
1227 if(!done)
David Howellsc4028952006-11-22 14:57:56 +00001228 schedule_delayed_work(&hostdata->coroutine, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 } while (!done);
1230 return IRQ_HANDLED;
1231}
1232
1233#endif
1234
1235/**
1236 * collect_stats - collect stats on a scsi command
1237 * @hostdata: adapter
1238 * @cmd: command being issued
1239 *
1240 * Update the statistical data by parsing the command in question
1241 */
1242
1243static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd)
1244{
1245#ifdef NCR5380_STATS
1246 switch (cmd->cmnd[0]) {
1247 case WRITE:
1248 case WRITE_6:
1249 case WRITE_10:
Jeff Garzik422c0d62005-10-24 18:05:09 -04001250 hostdata->time_write[scmd_id(cmd)] += (jiffies - hostdata->timebase);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251 hostdata->pendingw--;
1252 break;
1253 case READ:
1254 case READ_6:
1255 case READ_10:
Jeff Garzik422c0d62005-10-24 18:05:09 -04001256 hostdata->time_read[scmd_id(cmd)] += (jiffies - hostdata->timebase);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257 hostdata->pendingr--;
1258 break;
1259 }
1260#endif
1261}
1262
1263
1264/*
1265 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
1266 * int tag);
1267 *
1268 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1269 * including ARBITRATION, SELECTION, and initial message out for
1270 * IDENTIFY and queue messages.
1271 *
1272 * Inputs : instance - instantiation of the 5380 driver on which this
1273 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1274 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1275 * the command that is presently connected.
1276 *
1277 * Returns : -1 if selection could not execute for some reason,
1278 * 0 if selection succeeded or failed because the target
1279 * did not respond.
1280 *
1281 * Side effects :
1282 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1283 * with registers as they should have been on entry - ie
1284 * SELECT_ENABLE will be set appropriately, the NCR5380
1285 * will cease to drive any SCSI bus signals.
1286 *
1287 * If successful : I_T_L or I_T_L_Q nexus will be established,
1288 * instance->connected will be set to cmd.
1289 * SELECT interrupt will be disabled.
1290 *
1291 * If failed (no target) : cmd->scsi_done() will be called, and the
1292 * cmd->result host byte set to DID_BAD_TARGET.
1293 *
1294 * Locks: caller holds hostdata lock in IRQ mode
1295 */
1296
1297static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag)
1298{
1299 NCR5380_local_declare();
1300 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1301 unsigned char tmp[3], phase;
1302 unsigned char *data;
1303 int len;
1304 unsigned long timeout;
1305 unsigned char value;
1306 int err;
1307 NCR5380_setup(instance);
1308
1309 if (hostdata->selecting)
1310 goto part2;
1311
1312 hostdata->restart_select = 0;
1313
1314 NCR5380_dprint(NDEBUG_ARBITRATION, instance);
1315 dprintk(NDEBUG_ARBITRATION, ("scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id));
1316
1317 /*
1318 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1319 * data bus during SELECTION.
1320 */
1321
1322 NCR5380_write(TARGET_COMMAND_REG, 0);
1323
1324 /*
1325 * Start arbitration.
1326 */
1327
1328 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1329 NCR5380_write(MODE_REG, MR_ARBITRATE);
1330
1331
1332 /* We can be relaxed here, interrupts are on, we are
1333 in workqueue context, the birds are singing in the trees */
1334 spin_unlock_irq(instance->host_lock);
1335 err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ);
1336 spin_lock_irq(instance->host_lock);
1337 if (err < 0) {
1338 printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__);
1339 NCR5380_write(MODE_REG, MR_BASE);
1340 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1341 goto failed;
1342 }
1343
1344 dprintk(NDEBUG_ARBITRATION, ("scsi%d : arbitration complete\n", instance->host_no));
1345
1346 /*
1347 * The arbitration delay is 2.2us, but this is a minimum and there is
1348 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1349 * the integral nature of udelay().
1350 *
1351 */
1352
1353 udelay(3);
1354
1355 /* Check for lost arbitration */
1356 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
1357 NCR5380_write(MODE_REG, MR_BASE);
1358 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no));
1359 goto failed;
1360 }
1361 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL);
1362
1363 if (!(hostdata->flags & FLAG_DTC3181E) &&
1364 /* RvC: DTC3181E has some trouble with this
1365 * so we simply removed it. Seems to work with
1366 * only Mustek scanner attached
1367 */
1368 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
1369 NCR5380_write(MODE_REG, MR_BASE);
1370 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1371 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no));
1372 goto failed;
1373 }
1374 /*
1375 * Again, bus clear + bus settle time is 1.2us, however, this is
1376 * a minimum so we'll udelay ceil(1.2)
1377 */
1378
1379 udelay(2);
1380
1381 dprintk(NDEBUG_ARBITRATION, ("scsi%d : won arbitration\n", instance->host_no));
1382
1383 /*
1384 * Now that we have won arbitration, start Selection process, asserting
1385 * the host and target ID's on the SCSI bus.
1386 */
1387
Jeff Garzik422c0d62005-10-24 18:05:09 -04001388 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd))));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389
1390 /*
1391 * Raise ATN while SEL is true before BSY goes false from arbitration,
1392 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1393 * phase immediately after selection.
1394 */
1395
1396 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1397 NCR5380_write(MODE_REG, MR_BASE);
1398
1399 /*
1400 * Reselect interrupts must be turned off prior to the dropping of BSY,
1401 * otherwise we will trigger an interrupt.
1402 */
1403 NCR5380_write(SELECT_ENABLE_REG, 0);
1404
1405 /*
1406 * The initiator shall then wait at least two deskew delays and release
1407 * the BSY signal.
1408 */
1409 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1410
1411 /* Reset BSY */
1412 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1413
1414 /*
1415 * Something weird happens when we cease to drive BSY - looks
1416 * like the board/chip is letting us do another read before the
1417 * appropriate propagation delay has expired, and we're confusing
1418 * a BSY signal from ourselves as the target's response to SELECTION.
1419 *
1420 * A small delay (the 'C++' frontend breaks the pipeline with an
1421 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1422 * tighter 'C' code breaks and requires this) solves the problem -
1423 * the 1 us delay is arbitrary, and only used because this delay will
1424 * be the same on other platforms and since it works here, it should
1425 * work there.
1426 *
1427 * wingel suggests that this could be due to failing to wait
1428 * one deskew delay.
1429 */
1430
1431 udelay(1);
1432
Jeff Garzik422c0d62005-10-24 18:05:09 -04001433 dprintk(NDEBUG_SELECTION, ("scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434
1435 /*
1436 * The SCSI specification calls for a 250 ms timeout for the actual
1437 * selection.
1438 */
1439
1440 timeout = jiffies + (250 * HZ / 1000);
1441
1442 /*
1443 * XXX very interesting - we're seeing a bounce where the BSY we
1444 * asserted is being reflected / still asserted (propagation delay?)
1445 * and it's detecting as true. Sigh.
1446 */
1447
1448 hostdata->select_time = 0; /* we count the clock ticks at which we polled */
1449 hostdata->selecting = cmd;
1450
1451part2:
1452 /* RvC: here we enter after a sleeping period, or immediately after
1453 execution of part 1
1454 we poll only once ech clock tick */
1455 value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO);
1456
1457 if (!value && (hostdata->select_time < HZ/4)) {
1458 /* RvC: we still must wait for a device response */
1459 hostdata->select_time++; /* after 25 ticks the device has failed */
1460 NCR5380_set_timer(hostdata, 1);
1461 return 0; /* RvC: we return here with hostdata->selecting set,
1462 to go to sleep */
1463 }
1464
1465 hostdata->selecting = NULL;/* clear this pointer, because we passed the
1466 waiting period */
1467 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1468 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1469 NCR5380_reselect(instance);
1470 printk("scsi%d : reselection after won arbitration?\n", instance->host_no);
1471 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1472 return -1;
1473 }
1474 /*
1475 * No less than two deskew delays after the initiator detects the
1476 * BSY signal is true, it shall release the SEL signal and may
1477 * change the DATA BUS. -wingel
1478 */
1479
1480 udelay(1);
1481
1482 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1483
1484 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1485 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
Jeff Garzik422c0d62005-10-24 18:05:09 -04001486 if (hostdata->targets_present & (1 << scmd_id(cmd))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no);
1488 if (hostdata->restart_select)
1489 printk(KERN_DEBUG "\trestart select\n");
1490 NCR5380_dprint(NDEBUG_SELECTION, instance);
1491 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1492 return -1;
1493 }
1494 cmd->result = DID_BAD_TARGET << 16;
1495 collect_stats(hostdata, cmd);
1496 cmd->scsi_done(cmd);
1497 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1498 dprintk(NDEBUG_SELECTION, ("scsi%d : target did not respond within 250ms\n", instance->host_no));
1499 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1500 return 0;
1501 }
Jeff Garzik422c0d62005-10-24 18:05:09 -04001502 hostdata->targets_present |= (1 << scmd_id(cmd));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503
1504 /*
1505 * Since we followed the SCSI spec, and raised ATN while SEL
1506 * was true but before BSY was false during selection, the information
1507 * transfer phase should be a MESSAGE OUT phase so that we can send the
1508 * IDENTIFY message.
1509 *
1510 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1511 * message (2 bytes) with a tag ID that we increment with every command
1512 * until it wraps back to 0.
1513 *
1514 * XXX - it turns out that there are some broken SCSI-II devices,
1515 * which claim to support tagged queuing but fail when more than
1516 * some number of commands are issued at once.
1517 */
1518
1519 /* Wait for start of REQ/ACK handshake */
1520
1521 spin_unlock_irq(instance->host_lock);
1522 err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ);
1523 spin_lock_irq(instance->host_lock);
1524
1525 if(err) {
1526 printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__);
1527 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1528 goto failed;
1529 }
1530
1531 dprintk(NDEBUG_SELECTION, ("scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id));
1532 tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun);
1533
1534 len = 1;
1535 cmd->tag = 0;
1536
1537 /* Send message(s) */
1538 data = tmp;
1539 phase = PHASE_MSGOUT;
1540 NCR5380_transfer_pio(instance, &phase, &len, &data);
1541 dprintk(NDEBUG_SELECTION, ("scsi%d : nexus established.\n", instance->host_no));
1542 /* XXX need to handle errors here */
1543 hostdata->connected = cmd;
1544 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1545
Boaz Harrosh28424d32007-09-10 22:37:45 +03001546 initialize_SCp(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547
1548 return 0;
1549
1550 /* Selection failed */
1551failed:
1552 return -1;
1553
1554}
1555
1556/*
1557 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1558 * unsigned char *phase, int *count, unsigned char **data)
1559 *
1560 * Purpose : transfers data in given phase using polled I/O
1561 *
1562 * Inputs : instance - instance of driver, *phase - pointer to
1563 * what phase is expected, *count - pointer to number of
1564 * bytes to transfer, **data - pointer to data pointer.
1565 *
1566 * Returns : -1 when different phase is entered without transferring
1567 * maximum number of bytes, 0 if all bytes or transfered or exit
1568 * is in same phase.
1569 *
1570 * Also, *phase, *count, *data are modified in place.
1571 *
1572 * XXX Note : handling for bus free may be useful.
1573 */
1574
1575/*
1576 * Note : this code is not as quick as it could be, however it
1577 * IS 100% reliable, and for the actual data transfer where speed
1578 * counts, we will always do a pseudo DMA or DMA transfer.
1579 */
1580
1581static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1582 NCR5380_local_declare();
1583 unsigned char p = *phase, tmp;
1584 int c = *count;
1585 unsigned char *d = *data;
1586 /*
1587 * RvC: some administrative data to process polling time
1588 */
1589 int break_allowed = 0;
1590 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1591 NCR5380_setup(instance);
1592
1593 if (!(p & SR_IO))
1594 dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c));
1595 else
1596 dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c));
1597
1598 /*
1599 * The NCR5380 chip will only drive the SCSI bus when the
1600 * phase specified in the appropriate bits of the TARGET COMMAND
1601 * REGISTER match the STATUS REGISTER
1602 */
1603
1604 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1605
1606 /* RvC: don't know if this is necessary, but other SCSI I/O is short
1607 * so breaks are not necessary there
1608 */
1609 if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) {
1610 break_allowed = 1;
1611 }
1612 do {
1613 /*
1614 * Wait for assertion of REQ, after which the phase bits will be
1615 * valid
1616 */
1617
1618 /* RvC: we simply poll once, after that we stop temporarily
1619 * and let the device buffer fill up
1620 * if breaking is not allowed, we keep polling as long as needed
1621 */
1622
1623 /* FIXME */
1624 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed);
1625 if (!(tmp & SR_REQ)) {
1626 /* timeout condition */
1627 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
1628 break;
1629 }
1630
1631 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no));
1632
1633 /* Check for phase mismatch */
1634 if ((tmp & PHASE_MASK) != p) {
1635 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no));
1636 NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance);
1637 break;
1638 }
1639 /* Do actual transfer from SCSI bus to / from memory */
1640 if (!(p & SR_IO))
1641 NCR5380_write(OUTPUT_DATA_REG, *d);
1642 else
1643 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1644
1645 ++d;
1646
1647 /*
1648 * The SCSI standard suggests that in MSGOUT phase, the initiator
1649 * should drop ATN on the last byte of the message phase
1650 * after REQ has been asserted for the handshake but before
1651 * the initiator raises ACK.
1652 */
1653
1654 if (!(p & SR_IO)) {
1655 if (!((p & SR_MSG) && c > 1)) {
1656 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1657 NCR5380_dprint(NDEBUG_PIO, instance);
1658 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1659 } else {
1660 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1661 NCR5380_dprint(NDEBUG_PIO, instance);
1662 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1663 }
1664 } else {
1665 NCR5380_dprint(NDEBUG_PIO, instance);
1666 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1667 }
1668
1669 /* FIXME - if this fails bus reset ?? */
1670 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ);
1671 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no));
1672
1673/*
1674 * We have several special cases to consider during REQ/ACK handshaking :
1675 * 1. We were in MSGOUT phase, and we are on the last byte of the
1676 * message. ATN must be dropped as ACK is dropped.
1677 *
1678 * 2. We are in a MSGIN phase, and we are on the last byte of the
1679 * message. We must exit with ACK asserted, so that the calling
1680 * code may raise ATN before dropping ACK to reject the message.
1681 *
1682 * 3. ACK and ATN are clear and the target may proceed as normal.
1683 */
1684 if (!(p == PHASE_MSGIN && c == 1)) {
1685 if (p == PHASE_MSGOUT && c > 1)
1686 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1687 else
1688 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1689 }
1690 } while (--c);
1691
1692 dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c));
1693
1694 *count = c;
1695 *data = d;
1696 tmp = NCR5380_read(STATUS_REG);
1697 if (tmp & SR_REQ)
1698 *phase = tmp & PHASE_MASK;
1699 else
1700 *phase = PHASE_UNKNOWN;
1701
1702 if (!c || (*phase == p))
1703 return 0;
1704 else
1705 return -1;
1706}
1707
1708/**
1709 * do_reset - issue a reset command
1710 * @host: adapter to reset
1711 *
1712 * Issue a reset sequence to the NCR5380 and try and get the bus
1713 * back into sane shape.
1714 *
1715 * Locks: caller holds queue lock
1716 */
1717
1718static void do_reset(struct Scsi_Host *host) {
1719 NCR5380_local_declare();
1720 NCR5380_setup(host);
1721
1722 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
1723 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
1724 udelay(25);
1725 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1726}
1727
1728/*
1729 * Function : do_abort (Scsi_Host *host)
1730 *
1731 * Purpose : abort the currently established nexus. Should only be
1732 * called from a routine which can drop into a
1733 *
1734 * Returns : 0 on success, -1 on failure.
1735 *
1736 * Locks: queue lock held by caller
1737 * FIXME: sort this out and get new_eh running
1738 */
1739
1740static int do_abort(struct Scsi_Host *host) {
1741 NCR5380_local_declare();
1742 unsigned char *msgptr, phase, tmp;
1743 int len;
1744 int rc;
1745 NCR5380_setup(host);
1746
1747
1748 /* Request message out phase */
1749 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1750
1751 /*
1752 * Wait for the target to indicate a valid phase by asserting
1753 * REQ. Once this happens, we'll have either a MSGOUT phase
1754 * and can immediately send the ABORT message, or we'll have some
1755 * other phase and will have to source/sink data.
1756 *
1757 * We really don't care what value was on the bus or what value
1758 * the target sees, so we just handshake.
1759 */
1760
1761 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ);
1762
1763 if(rc < 0)
1764 return -1;
1765
1766 tmp = (unsigned char)rc;
1767
1768 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1769
1770 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1771 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1772 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ);
1773 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1774 if(rc == -1)
1775 return -1;
1776 }
1777 tmp = ABORT;
1778 msgptr = &tmp;
1779 len = 1;
1780 phase = PHASE_MSGOUT;
1781 NCR5380_transfer_pio(host, &phase, &len, &msgptr);
1782
1783 /*
1784 * If we got here, and the command completed successfully,
1785 * we're about to go into bus free state.
1786 */
1787
1788 return len ? -1 : 0;
1789}
1790
1791#if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL)
1792/*
1793 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1794 * unsigned char *phase, int *count, unsigned char **data)
1795 *
1796 * Purpose : transfers data in given phase using either real
1797 * or pseudo DMA.
1798 *
1799 * Inputs : instance - instance of driver, *phase - pointer to
1800 * what phase is expected, *count - pointer to number of
1801 * bytes to transfer, **data - pointer to data pointer.
1802 *
1803 * Returns : -1 when different phase is entered without transferring
1804 * maximum number of bytes, 0 if all bytes or transfered or exit
1805 * is in same phase.
1806 *
1807 * Also, *phase, *count, *data are modified in place.
1808 *
1809 * Locks: io_request lock held by caller
1810 */
1811
1812
1813static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1814 NCR5380_local_declare();
1815 register int c = *count;
1816 register unsigned char p = *phase;
1817 register unsigned char *d = *data;
1818 unsigned char tmp;
1819 int foo;
1820#if defined(REAL_DMA_POLL)
1821 int cnt, toPIO;
1822 unsigned char saved_data = 0, overrun = 0, residue;
1823#endif
1824
1825 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1826
1827 NCR5380_setup(instance);
1828
1829 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1830 *phase = tmp;
1831 return -1;
1832 }
1833#if defined(REAL_DMA) || defined(REAL_DMA_POLL)
1834#ifdef READ_OVERRUNS
1835 if (p & SR_IO) {
1836 c -= 2;
1837 }
1838#endif
1839 dprintk(NDEBUG_DMA, ("scsi%d : initializing DMA channel %d for %s, %d bytes %s %0x\n", instance->host_no, instance->dma_channel, (p & SR_IO) ? "reading" : "writing", c, (p & SR_IO) ? "to" : "from", (unsigned) d));
1840 hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c);
1841#endif
1842
1843 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1844
1845#ifdef REAL_DMA
1846 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
1847#elif defined(REAL_DMA_POLL)
1848 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
1849#else
1850 /*
1851 * Note : on my sample board, watch-dog timeouts occurred when interrupts
1852 * were not disabled for the duration of a single DMA transfer, from
1853 * before the setting of DMA mode to after transfer of the last byte.
1854 */
1855
1856#if defined(PSEUDO_DMA) && defined(UNSAFE)
1857 spin_unlock_irq(instance->host_lock);
1858#endif
1859 /* KLL May need eop and parity in 53c400 */
1860 if (hostdata->flags & FLAG_NCR53C400)
Roel Kluin085267a2010-08-10 18:01:11 -07001861 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE |
1862 MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR |
1863 MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001864 else
1865 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
1866#endif /* def REAL_DMA */
1867
1868 dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG)));
1869
1870 /*
1871 * On the PAS16 at least I/O recovery delays are not needed here.
1872 * Everyone else seems to want them.
1873 */
1874
1875 if (p & SR_IO) {
1876 io_recovery_delay(1);
1877 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1878 } else {
1879 io_recovery_delay(1);
1880 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1881 io_recovery_delay(1);
1882 NCR5380_write(START_DMA_SEND_REG, 0);
1883 io_recovery_delay(1);
1884 }
1885
1886#if defined(REAL_DMA_POLL)
1887 do {
1888 tmp = NCR5380_read(BUS_AND_STATUS_REG);
1889 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER)));
1890
1891/*
1892 At this point, either we've completed DMA, or we have a phase mismatch,
1893 or we've unexpectedly lost BUSY (which is a real error).
1894
1895 For write DMAs, we want to wait until the last byte has been
1896 transferred out over the bus before we turn off DMA mode. Alas, there
1897 seems to be no terribly good way of doing this on a 5380 under all
1898 conditions. For non-scatter-gather operations, we can wait until REQ
1899 and ACK both go false, or until a phase mismatch occurs. Gather-writes
1900 are nastier, since the device will be expecting more data than we
1901 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
1902 could test LAST BIT SENT to assure transfer (I imagine this is precisely
1903 why this signal was added to the newer chips) but on the older 538[01]
1904 this signal does not exist. The workaround for this lack is a watchdog;
1905 we bail out of the wait-loop after a modest amount of wait-time if
1906 the usual exit conditions are not met. Not a terribly clean or
1907 correct solution :-%
1908
1909 Reads are equally tricky due to a nasty characteristic of the NCR5380.
1910 If the chip is in DMA mode for an READ, it will respond to a target's
1911 REQ by latching the SCSI data into the INPUT DATA register and asserting
1912 ACK, even if it has _already_ been notified by the DMA controller that
1913 the current DMA transfer has completed! If the NCR5380 is then taken
1914 out of DMA mode, this already-acknowledged byte is lost.
1915
1916 This is not a problem for "one DMA transfer per command" reads, because
1917 the situation will never arise... either all of the data is DMA'ed
1918 properly, or the target switches to MESSAGE IN phase to signal a
1919 disconnection (either operation bringing the DMA to a clean halt).
1920 However, in order to handle scatter-reads, we must work around the
1921 problem. The chosen fix is to DMA N-2 bytes, then check for the
1922 condition before taking the NCR5380 out of DMA mode. One or two extra
1923 bytes are transferred via PIO as necessary to fill out the original
1924 request.
1925 */
1926
1927 if (p & SR_IO) {
1928#ifdef READ_OVERRUNS
1929 udelay(10);
1930 if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) {
1931 saved_data = NCR5380_read(INPUT_DATA_REGISTER);
1932 overrun = 1;
1933 }
1934#endif
1935 } else {
1936 int limit = 100;
1937 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) {
1938 if (!(tmp & BASR_PHASE_MATCH))
1939 break;
1940 if (--limit < 0)
1941 break;
1942 }
1943 }
1944
1945 dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG)));
1946
1947 NCR5380_write(MODE_REG, MR_BASE);
1948 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1949
1950 residue = NCR5380_dma_residual(instance);
1951 c -= residue;
1952 *count -= c;
1953 *data += c;
1954 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
1955
1956#ifdef READ_OVERRUNS
1957 if (*phase == p && (p & SR_IO) && residue == 0) {
1958 if (overrun) {
1959 dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n"));
1960 **data = saved_data;
1961 *data += 1;
1962 *count -= 1;
1963 cnt = toPIO = 1;
1964 } else {
1965 printk("No overrun??\n");
1966 cnt = toPIO = 2;
1967 }
1968 dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data));
1969 NCR5380_transfer_pio(instance, phase, &cnt, data);
1970 *count -= toPIO - cnt;
1971 }
1972#endif
1973
1974 dprintk(NDEBUG_DMA, ("Return with data ptr = 0x%X, count %d, last 0x%X, next 0x%X\n", *data, *count, *(*data + *count - 1), *(*data + *count)));
1975 return 0;
1976
1977#elif defined(REAL_DMA)
1978 return 0;
1979#else /* defined(REAL_DMA_POLL) */
1980 if (p & SR_IO) {
1981#ifdef DMA_WORKS_RIGHT
1982 foo = NCR5380_pread(instance, d, c);
1983#else
1984 int diff = 1;
1985 if (hostdata->flags & FLAG_NCR53C400) {
1986 diff = 0;
1987 }
1988 if (!(foo = NCR5380_pread(instance, d, c - diff))) {
1989 /*
1990 * We can't disable DMA mode after successfully transferring
1991 * what we plan to be the last byte, since that would open up
1992 * a race condition where if the target asserted REQ before
1993 * we got the DMA mode reset, the NCR5380 would have latched
1994 * an additional byte into the INPUT DATA register and we'd
1995 * have dropped it.
1996 *
1997 * The workaround was to transfer one fewer bytes than we
1998 * intended to with the pseudo-DMA read function, wait for
1999 * the chip to latch the last byte, read it, and then disable
2000 * pseudo-DMA mode.
2001 *
2002 * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
2003 * REQ is deasserted when ACK is asserted, and not reasserted
2004 * until ACK goes false. Since the NCR5380 won't lower ACK
2005 * until DACK is asserted, which won't happen unless we twiddle
2006 * the DMA port or we take the NCR5380 out of DMA mode, we
2007 * can guarantee that we won't handshake another extra
2008 * byte.
2009 */
2010
2011 if (!(hostdata->flags & FLAG_NCR53C400)) {
2012 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ));
2013 /* Wait for clean handshake */
2014 while (NCR5380_read(STATUS_REG) & SR_REQ);
2015 d[c - 1] = NCR5380_read(INPUT_DATA_REG);
2016 }
2017 }
2018#endif
2019 } else {
2020#ifdef DMA_WORKS_RIGHT
2021 foo = NCR5380_pwrite(instance, d, c);
2022#else
2023 int timeout;
2024 dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c));
2025 if (!(foo = NCR5380_pwrite(instance, d, c))) {
2026 /*
2027 * Wait for the last byte to be sent. If REQ is being asserted for
2028 * the byte we're interested, we'll ACK it and it will go false.
2029 */
2030 if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) {
2031 timeout = 20000;
2032 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH));
2033
2034 if (!timeout)
2035 dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no));
2036
2037 if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) {
2038 hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT;
2039 if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) {
2040 hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT;
2041 dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no));
2042 }
2043 }
2044 } else {
2045 dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n"));
2046 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT));
2047 dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n"));
2048 }
2049 }
2050#endif
2051 }
2052 NCR5380_write(MODE_REG, MR_BASE);
2053 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2054
2055 if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) {
2056 dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n"));
2057 if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) {
2058 dprintk(NDEBUG_C400_PWRITE, ("53C400w: got it, reading reset interrupt reg\n"));
2059 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
2060 } else {
2061 printk("53C400w: IRQ NOT THERE!\n");
2062 }
2063 }
2064 *data = d + c;
2065 *count = 0;
2066 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
2067#if defined(PSEUDO_DMA) && defined(UNSAFE)
2068 spin_lock_irq(instance->host_lock);
2069#endif /* defined(REAL_DMA_POLL) */
2070 return foo;
2071#endif /* def REAL_DMA */
2072}
2073#endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */
2074
2075/*
2076 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
2077 *
2078 * Purpose : run through the various SCSI phases and do as the target
2079 * directs us to. Operates on the currently connected command,
2080 * instance->connected.
2081 *
2082 * Inputs : instance, instance for which we are doing commands
2083 *
2084 * Side effects : SCSI things happen, the disconnected queue will be
2085 * modified if a command disconnects, *instance->connected will
2086 * change.
2087 *
2088 * XXX Note : we need to watch for bus free or a reset condition here
2089 * to recover from an unexpected bus free condition.
2090 *
2091 * Locks: io_request_lock held by caller in IRQ mode
2092 */
2093
2094static void NCR5380_information_transfer(struct Scsi_Host *instance) {
2095 NCR5380_local_declare();
2096 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata;
2097 unsigned char msgout = NOP;
2098 int sink = 0;
2099 int len;
2100#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2101 int transfersize;
2102#endif
2103 unsigned char *data;
2104 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
2105 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
2106 /* RvC: we need to set the end of the polling time */
2107 unsigned long poll_time = jiffies + USLEEP_POLL;
2108
2109 NCR5380_setup(instance);
2110
2111 while (1) {
2112 tmp = NCR5380_read(STATUS_REG);
2113 /* We only have a valid SCSI phase when REQ is asserted */
2114 if (tmp & SR_REQ) {
2115 phase = (tmp & PHASE_MASK);
2116 if (phase != old_phase) {
2117 old_phase = phase;
2118 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance);
2119 }
2120 if (sink && (phase != PHASE_MSGOUT)) {
2121 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2122
2123 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
2124 while (NCR5380_read(STATUS_REG) & SR_REQ);
2125 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2126 sink = 0;
2127 continue;
2128 }
2129 switch (phase) {
2130 case PHASE_DATAIN:
2131 case PHASE_DATAOUT:
2132#if (NDEBUG & NDEBUG_NO_DATAOUT)
2133 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no);
2134 sink = 1;
2135 do_abort(instance);
2136 cmd->result = DID_ERROR << 16;
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04002137 cmd->scsi_done(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002138 return;
2139#endif
2140 /*
2141 * If there is no room left in the current buffer in the
2142 * scatter-gather list, move onto the next one.
2143 */
2144
2145 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2146 ++cmd->SCp.buffer;
2147 --cmd->SCp.buffers_residual;
2148 cmd->SCp.this_residual = cmd->SCp.buffer->length;
Jens Axboe45711f12007-10-22 21:19:53 +02002149 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002150 dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual));
2151 }
2152 /*
2153 * The preferred transfer method is going to be
2154 * PSEUDO-DMA for systems that are strictly PIO,
2155 * since we can let the hardware do the handshaking.
2156 *
2157 * For this to work, we need to know the transfersize
2158 * ahead of time, since the pseudo-DMA code will sit
2159 * in an unconditional loop.
2160 */
2161
2162#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2163 /* KLL
2164 * PSEUDO_DMA is defined here. If this is the g_NCR5380
2165 * driver then it will always be defined, so the
2166 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
2167 * NCR5380 case. I think this is a fairly clean solution.
2168 * We supplement these 2 if's with the flag.
2169 */
2170#ifdef NCR5380_dma_xfer_len
2171 if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) {
2172#else
2173 transfersize = cmd->transfersize;
2174
2175#ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */
2176 if (transfersize > 512)
2177 transfersize = 512;
2178#endif /* LIMIT_TRANSFERSIZE */
2179
2180 if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) {
2181 /* Limit transfers to 32K, for xx400 & xx406
2182 * pseudoDMA that transfers in 128 bytes blocks. */
2183 if (transfersize > 32 * 1024)
2184 transfersize = 32 * 1024;
2185#endif
2186 len = transfersize;
2187 if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) {
2188 /*
2189 * If the watchdog timer fires, all future accesses to this
2190 * device will use the polled-IO.
2191 */
Jeff Garzik017560f2005-10-24 18:04:36 -04002192 scmd_printk(KERN_INFO, cmd,
2193 "switching to slow handshake\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002194 cmd->device->borken = 1;
2195 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2196 sink = 1;
2197 do_abort(instance);
2198 cmd->result = DID_ERROR << 16;
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04002199 cmd->scsi_done(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002200 /* XXX - need to source or sink data here, as appropriate */
2201 } else
2202 cmd->SCp.this_residual -= transfersize - len;
2203 } else
2204#endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */
2205 NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **)
2206 &cmd->SCp.ptr);
2207 break;
2208 case PHASE_MSGIN:
2209 len = 1;
2210 data = &tmp;
2211 NCR5380_transfer_pio(instance, &phase, &len, &data);
2212 cmd->SCp.Message = tmp;
2213
2214 switch (tmp) {
2215 /*
2216 * Linking lets us reduce the time required to get the
2217 * next command out to the device, hopefully this will
2218 * mean we don't waste another revolution due to the delays
2219 * required by ARBITRATION and another SELECTION.
2220 *
2221 * In the current implementation proposal, low level drivers
2222 * merely have to start the next command, pointed to by
2223 * next_link, done() is called as with unlinked commands.
2224 */
2225#ifdef LINKED
2226 case LINKED_CMD_COMPLETE:
2227 case LINKED_FLG_CMD_COMPLETE:
2228 /* Accept message by clearing ACK */
2229 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2230 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun));
2231 /*
2232 * Sanity check : A linked command should only terminate with
2233 * one of these messages if there are more linked commands
2234 * available.
2235 */
2236 if (!cmd->next_link) {
2237 printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun);
2238 sink = 1;
2239 do_abort(instance);
2240 return;
2241 }
2242 initialize_SCp(cmd->next_link);
2243 /* The next command is still part of this process */
2244 cmd->next_link->tag = cmd->tag;
2245 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2246 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun));
2247 collect_stats(hostdata, cmd);
2248 cmd->scsi_done(cmd);
2249 cmd = hostdata->connected;
2250 break;
2251#endif /* def LINKED */
2252 case ABORT:
2253 case COMMAND_COMPLETE:
2254 /* Accept message by clearing ACK */
2255 sink = 1;
2256 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2257 hostdata->connected = NULL;
2258 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun));
2259 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2260
2261 /*
2262 * I'm not sure what the correct thing to do here is :
2263 *
2264 * If the command that just executed is NOT a request
2265 * sense, the obvious thing to do is to set the result
2266 * code to the values of the stored parameters.
2267 *
2268 * If it was a REQUEST SENSE command, we need some way
2269 * to differentiate between the failure code of the original
2270 * and the failure code of the REQUEST sense - the obvious
2271 * case is success, where we fall through and leave the result
2272 * code unchanged.
2273 *
2274 * The non-obvious place is where the REQUEST SENSE failed
2275 */
2276
2277 if (cmd->cmnd[0] != REQUEST_SENSE)
2278 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2279 else if (status_byte(cmd->SCp.Status) != GOOD)
2280 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2281
2282#ifdef AUTOSENSE
Boaz Harrosh28424d32007-09-10 22:37:45 +03002283 if ((cmd->cmnd[0] == REQUEST_SENSE) &&
2284 hostdata->ses.cmd_len) {
2285 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
2286 hostdata->ses.cmd_len = 0 ;
2287 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002288
Boaz Harrosh28424d32007-09-10 22:37:45 +03002289 if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2290 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
2291
2292 dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002293
2294 LIST(cmd, hostdata->issue_queue);
2295 cmd->host_scribble = (unsigned char *)
2296 hostdata->issue_queue;
2297 hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2298 dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no));
2299 } else
2300#endif /* def AUTOSENSE */
2301 {
2302 collect_stats(hostdata, cmd);
2303 cmd->scsi_done(cmd);
2304 }
2305
2306 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2307 /*
2308 * Restore phase bits to 0 so an interrupted selection,
2309 * arbitration can resume.
2310 */
2311 NCR5380_write(TARGET_COMMAND_REG, 0);
2312
2313 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2314 barrier();
2315 return;
2316 case MESSAGE_REJECT:
2317 /* Accept message by clearing ACK */
2318 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2319 switch (hostdata->last_message) {
2320 case HEAD_OF_QUEUE_TAG:
2321 case ORDERED_QUEUE_TAG:
2322 case SIMPLE_QUEUE_TAG:
2323 cmd->device->simple_tags = 0;
2324 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2325 break;
2326 default:
2327 break;
2328 }
2329 case DISCONNECT:{
2330 /* Accept message by clearing ACK */
2331 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2332 cmd->device->disconnect = 1;
2333 LIST(cmd, hostdata->disconnected_queue);
2334 cmd->host_scribble = (unsigned char *)
2335 hostdata->disconnected_queue;
2336 hostdata->connected = NULL;
2337 hostdata->disconnected_queue = cmd;
2338 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d lun %d was moved from connected to" " the disconnected_queue\n", instance->host_no, cmd->device->id, cmd->device->lun));
2339 /*
2340 * Restore phase bits to 0 so an interrupted selection,
2341 * arbitration can resume.
2342 */
2343 NCR5380_write(TARGET_COMMAND_REG, 0);
2344
2345 /* Enable reselect interrupts */
2346 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2347 /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/
2348 /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */
2349 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2350 barrier();
2351 return;
2352 }
2353 /*
2354 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2355 * operation, in violation of the SCSI spec so we can safely
2356 * ignore SAVE/RESTORE pointers calls.
2357 *
2358 * Unfortunately, some disks violate the SCSI spec and
2359 * don't issue the required SAVE_POINTERS message before
2360 * disconnecting, and we have to break spec to remain
2361 * compatible.
2362 */
2363 case SAVE_POINTERS:
2364 case RESTORE_POINTERS:
2365 /* Accept message by clearing ACK */
2366 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2367 break;
2368 case EXTENDED_MESSAGE:
2369/*
2370 * Extended messages are sent in the following format :
2371 * Byte
2372 * 0 EXTENDED_MESSAGE == 1
2373 * 1 length (includes one byte for code, doesn't
2374 * include first two bytes)
2375 * 2 code
2376 * 3..length+1 arguments
2377 *
2378 * Start the extended message buffer with the EXTENDED_MESSAGE
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002379 * byte, since spi_print_msg() wants the whole thing.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002380 */
2381 extended_msg[0] = EXTENDED_MESSAGE;
2382 /* Accept first byte by clearing ACK */
2383 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2384 dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no));
2385
2386 len = 2;
2387 data = extended_msg + 1;
2388 phase = PHASE_MSGIN;
2389 NCR5380_transfer_pio(instance, &phase, &len, &data);
2390
2391 dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2]));
2392
2393 if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) {
2394 /* Accept third byte by clearing ACK */
2395 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2396 len = extended_msg[1] - 1;
2397 data = extended_msg + 3;
2398 phase = PHASE_MSGIN;
2399
2400 NCR5380_transfer_pio(instance, &phase, &len, &data);
2401 dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len));
2402
2403 switch (extended_msg[2]) {
2404 case EXTENDED_SDTR:
2405 case EXTENDED_WDTR:
2406 case EXTENDED_MODIFY_DATA_POINTER:
2407 case EXTENDED_EXTENDED_IDENTIFY:
2408 tmp = 0;
2409 }
2410 } else if (len) {
2411 printk("scsi%d: error receiving extended message\n", instance->host_no);
2412 tmp = 0;
2413 } else {
2414 printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]);
2415 tmp = 0;
2416 }
2417 /* Fall through to reject message */
2418
2419 /*
2420 * If we get something weird that we aren't expecting,
2421 * reject it.
2422 */
2423 default:
2424 if (!tmp) {
2425 printk("scsi%d: rejecting message ", instance->host_no);
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002426 spi_print_msg(extended_msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002427 printk("\n");
2428 } else if (tmp != EXTENDED_MESSAGE)
Jeff Garzik017560f2005-10-24 18:04:36 -04002429 scmd_printk(KERN_INFO, cmd,
2430 "rejecting unknown message %02x\n",tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002431 else
Jeff Garzik017560f2005-10-24 18:04:36 -04002432 scmd_printk(KERN_INFO, cmd,
2433 "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002434
2435 msgout = MESSAGE_REJECT;
2436 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2437 break;
2438 } /* switch (tmp) */
2439 break;
2440 case PHASE_MSGOUT:
2441 len = 1;
2442 data = &msgout;
2443 hostdata->last_message = msgout;
2444 NCR5380_transfer_pio(instance, &phase, &len, &data);
2445 if (msgout == ABORT) {
2446 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2447 hostdata->connected = NULL;
2448 cmd->result = DID_ERROR << 16;
2449 collect_stats(hostdata, cmd);
2450 cmd->scsi_done(cmd);
2451 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2452 return;
2453 }
2454 msgout = NOP;
2455 break;
2456 case PHASE_CMDOUT:
2457 len = cmd->cmd_len;
2458 data = cmd->cmnd;
2459 /*
2460 * XXX for performance reasons, on machines with a
2461 * PSEUDO-DMA architecture we should probably
2462 * use the dma transfer function.
2463 */
2464 NCR5380_transfer_pio(instance, &phase, &len, &data);
2465 if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) {
2466 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
2467 dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
2468 return;
2469 }
2470 break;
2471 case PHASE_STATIN:
2472 len = 1;
2473 data = &tmp;
2474 NCR5380_transfer_pio(instance, &phase, &len, &data);
2475 cmd->SCp.Status = tmp;
2476 break;
2477 default:
2478 printk("scsi%d : unknown phase\n", instance->host_no);
2479 NCR5380_dprint(NDEBUG_ALL, instance);
2480 } /* switch(phase) */
2481 } /* if (tmp * SR_REQ) */
2482 else {
2483 /* RvC: go to sleep if polling time expired
2484 */
2485 if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) {
2486 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
2487 dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
2488 return;
2489 }
2490 }
2491 } /* while (1) */
2492}
2493
2494/*
2495 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2496 *
2497 * Purpose : does reselection, initializing the instance->connected
2498 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2499 * nexus has been reestablished,
2500 *
2501 * Inputs : instance - this instance of the NCR5380.
2502 *
2503 * Locks: io_request_lock held by caller if IRQ driven
2504 */
2505
2506static void NCR5380_reselect(struct Scsi_Host *instance) {
2507 NCR5380_local_declare();
2508 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
2509 instance->hostdata;
2510 unsigned char target_mask;
2511 unsigned char lun, phase;
2512 int len;
2513 unsigned char msg[3];
2514 unsigned char *data;
2515 Scsi_Cmnd *tmp = NULL, *prev;
2516 int abort = 0;
2517 NCR5380_setup(instance);
2518
2519 /*
2520 * Disable arbitration, etc. since the host adapter obviously
2521 * lost, and tell an interrupted NCR5380_select() to restart.
2522 */
2523
2524 NCR5380_write(MODE_REG, MR_BASE);
2525 hostdata->restart_select = 1;
2526
2527 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2528 dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no));
2529
2530 /*
2531 * At this point, we have detected that our SCSI ID is on the bus,
2532 * SEL is true and BSY was false for at least one bus settle delay
2533 * (400 ns).
2534 *
2535 * We must assert BSY ourselves, until the target drops the SEL
2536 * signal.
2537 */
2538
2539 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2540
2541 /* FIXME: timeout too long, must fail to workqueue */
2542 if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0)
2543 abort = 1;
2544
2545 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2546
2547 /*
2548 * Wait for target to go into MSGIN.
2549 * FIXME: timeout needed and fail to work queeu
2550 */
2551
2552 if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ))
2553 abort = 1;
2554
2555 len = 1;
2556 data = msg;
2557 phase = PHASE_MSGIN;
2558 NCR5380_transfer_pio(instance, &phase, &len, &data);
2559
2560 if (!(msg[0] & 0x80)) {
2561 printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no);
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002562 spi_print_msg(msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002563 abort = 1;
2564 } else {
2565 /* Accept message by clearing ACK */
2566 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2567 lun = (msg[0] & 0x07);
2568
2569 /*
2570 * We need to add code for SCSI-II to track which devices have
2571 * I_T_L_Q nexuses established, and which have simple I_T_L
2572 * nexuses so we can chose to do additional data transfer.
2573 */
2574
2575 /*
2576 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2577 * just reestablished, and remove it from the disconnected queue.
2578 */
2579
2580
2581 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
2582 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2583 ) {
2584 if (prev) {
2585 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
2586 prev->host_scribble = tmp->host_scribble;
2587 } else {
2588 REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble);
2589 hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble;
2590 }
2591 tmp->host_scribble = NULL;
2592 break;
2593 }
2594 if (!tmp) {
2595 printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun);
2596 /*
2597 * Since we have an established nexus that we can't do anything with,
2598 * we must abort it.
2599 */
2600 abort = 1;
2601 }
2602 }
2603
2604 if (abort) {
2605 do_abort(instance);
2606 } else {
2607 hostdata->connected = tmp;
2608 dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag));
2609 }
2610}
2611
2612/*
2613 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
2614 *
2615 * Purpose : called by interrupt handler when DMA finishes or a phase
2616 * mismatch occurs (which would finish the DMA transfer).
2617 *
2618 * Inputs : instance - this instance of the NCR5380.
2619 *
2620 * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L
2621 * nexus has been reestablished, on failure NULL is returned.
2622 */
2623
2624#ifdef REAL_DMA
2625static void NCR5380_dma_complete(NCR5380_instance * instance) {
2626 NCR5380_local_declare();
Yoann Padioleauf8343682007-06-01 00:46:36 -07002627 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002628 int transferred;
2629 NCR5380_setup(instance);
2630
2631 /*
2632 * XXX this might not be right.
2633 *
2634 * Wait for final byte to transfer, ie wait for ACK to go false.
2635 *
2636 * We should use the Last Byte Sent bit, unfortunately this is
2637 * not available on the 5380/5381 (only the various CMOS chips)
2638 *
2639 * FIXME: timeout, and need to handle long timeout/irq case
2640 */
2641
2642 NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ);
2643
2644 NCR5380_write(MODE_REG, MR_BASE);
2645 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2646
2647 /*
2648 * The only places we should see a phase mismatch and have to send
2649 * data from the same set of pointers will be the data transfer
2650 * phases. So, residual, requested length are only important here.
2651 */
2652
2653 if (!(hostdata->connected->SCp.phase & SR_CD)) {
2654 transferred = instance->dmalen - NCR5380_dma_residual();
2655 hostdata->connected->SCp.this_residual -= transferred;
2656 hostdata->connected->SCp.ptr += transferred;
2657 }
2658}
2659#endif /* def REAL_DMA */
2660
2661/*
2662 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2663 *
2664 * Purpose : abort a command
2665 *
2666 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2667 * host byte of the result field to, if zero DID_ABORTED is
2668 * used.
2669 *
2670 * Returns : 0 - success, -1 on failure.
2671 *
2672 * XXX - there is no way to abort the command that is currently
2673 * connected, you have to wait for it to complete. If this is
2674 * a problem, we could implement longjmp() / setjmp(), setjmp()
2675 * called where the loop started in NCR5380_main().
2676 *
2677 * Locks: host lock taken by caller
2678 */
2679
2680static int NCR5380_abort(Scsi_Cmnd * cmd) {
2681 NCR5380_local_declare();
2682 struct Scsi_Host *instance = cmd->device->host;
2683 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
2684 Scsi_Cmnd *tmp, **prev;
2685
2686 printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no);
db9dff32005-04-03 14:53:59 -05002687 scsi_print_command(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002688
2689 NCR5380_print_status(instance);
2690
2691 NCR5380_setup(instance);
2692
2693 dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no));
2694 dprintk(NDEBUG_ABORT, (" basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG)));
2695
2696#if 0
2697/*
2698 * Case 1 : If the command is the currently executing command,
2699 * we'll set the aborted flag and return control so that
2700 * information transfer routine can exit cleanly.
2701 */
2702
2703 if (hostdata->connected == cmd) {
2704 dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no));
2705 hostdata->aborted = 1;
2706/*
2707 * We should perform BSY checking, and make sure we haven't slipped
2708 * into BUS FREE.
2709 */
2710
2711 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN);
2712/*
2713 * Since we can't change phases until we've completed the current
2714 * handshake, we have to source or sink a byte of data if the current
2715 * phase is not MSGOUT.
2716 */
2717
2718/*
2719 * Return control to the executing NCR drive so we can clear the
2720 * aborted flag and get back into our main loop.
2721 */
2722
2723 return 0;
2724 }
2725#endif
2726
2727/*
2728 * Case 2 : If the command hasn't been issued yet, we simply remove it
2729 * from the issue queue.
2730 */
2731
2732 dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no));
2733 for (prev = (Scsi_Cmnd **) & (hostdata->issue_queue), tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble)
2734 if (cmd == tmp) {
2735 REMOVE(5, *prev, tmp, tmp->host_scribble);
2736 (*prev) = (Scsi_Cmnd *) tmp->host_scribble;
2737 tmp->host_scribble = NULL;
2738 tmp->result = DID_ABORT << 16;
2739 dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no));
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04002740 tmp->scsi_done(tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002741 return SUCCESS;
2742 }
2743#if (NDEBUG & NDEBUG_ABORT)
2744 /* KLL */
2745 else if (prev == tmp)
2746 printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no);
2747#endif
2748
2749/*
2750 * Case 3 : If any commands are connected, we're going to fail the abort
2751 * and let the high level SCSI driver retry at a later time or
2752 * issue a reset.
2753 *
2754 * Timeouts, and therefore aborted commands, will be highly unlikely
2755 * and handling them cleanly in this situation would make the common
2756 * case of noresets less efficient, and would pollute our code. So,
2757 * we fail.
2758 */
2759
2760 if (hostdata->connected) {
2761 dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no));
2762 return FAILED;
2763 }
2764/*
2765 * Case 4: If the command is currently disconnected from the bus, and
2766 * there are no connected commands, we reconnect the I_T_L or
2767 * I_T_L_Q nexus associated with it, go into message out, and send
2768 * an abort message.
2769 *
2770 * This case is especially ugly. In order to reestablish the nexus, we
2771 * need to call NCR5380_select(). The easiest way to implement this
2772 * function was to abort if the bus was busy, and let the interrupt
2773 * handler triggered on the SEL for reselect take care of lost arbitrations
2774 * where necessary, meaning interrupts need to be enabled.
2775 *
2776 * When interrupts are enabled, the queues may change - so we
2777 * can't remove it from the disconnected queue before selecting it
2778 * because that could cause a failure in hashing the nexus if that
2779 * device reselected.
2780 *
2781 * Since the queues may change, we can't use the pointers from when we
2782 * first locate it.
2783 *
2784 * So, we must first locate the command, and if NCR5380_select()
2785 * succeeds, then issue the abort, relocate the command and remove
2786 * it from the disconnected queue.
2787 */
2788
2789 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble)
2790 if (cmd == tmp) {
2791 dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no));
2792
2793 if (NCR5380_select(instance, cmd, (int) cmd->tag))
2794 return FAILED;
2795 dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no));
2796
2797 do_abort(instance);
2798
2799 for (prev = (Scsi_Cmnd **) & (hostdata->disconnected_queue), tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble)
2800 if (cmd == tmp) {
2801 REMOVE(5, *prev, tmp, tmp->host_scribble);
2802 *prev = (Scsi_Cmnd *) tmp->host_scribble;
2803 tmp->host_scribble = NULL;
2804 tmp->result = DID_ABORT << 16;
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04002805 tmp->scsi_done(tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002806 return SUCCESS;
2807 }
2808 }
2809/*
2810 * Case 5 : If we reached this point, the command was not found in any of
2811 * the queues.
2812 *
2813 * We probably reached this point because of an unlikely race condition
2814 * between the command completing successfully and the abortion code,
2815 * so we won't panic, but we will notify the user in case something really
2816 * broke.
2817 */
2818 printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n"
2819 " before abortion\n", instance->host_no);
2820 return FAILED;
2821}
2822
2823
2824/*
2825 * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd)
2826 *
2827 * Purpose : reset the SCSI bus.
2828 *
2829 * Returns : SUCCESS
2830 *
2831 * Locks: host lock taken by caller
2832 */
2833
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04002834static int NCR5380_bus_reset(Scsi_Cmnd * cmd)
2835{
2836 struct Scsi_Host *instance = cmd->device->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002837
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04002838 NCR5380_local_declare();
2839 NCR5380_setup(instance);
2840 NCR5380_print_status(instance);
2841
2842 spin_lock_irq(instance->host_lock);
2843 do_reset(instance);
2844 spin_unlock_irq(instance->host_lock);
2845
Linus Torvalds1da177e2005-04-16 15:20:36 -07002846 return SUCCESS;
2847}