blob: f92da9fd5f20f3a67dfbcb0ae1e72dfb59dd0316 [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
955static int NCR5380_queue_command(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
956{
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
1024
1025/**
1026 * NCR5380_main - NCR state machines
1027 *
1028 * NCR5380_main is a coroutine that runs as long as more work can
1029 * be done on the NCR5380 host adapters in a system. Both
1030 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1031 * in case it is not running.
1032 *
1033 * Locks: called as its own thread with no locks held. Takes the
1034 * host lock and called routines may take the isa dma lock.
1035 */
1036
David Howellsc4028952006-11-22 14:57:56 +00001037static void NCR5380_main(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038{
David Howellsc4028952006-11-22 14:57:56 +00001039 struct NCR5380_hostdata *hostdata =
1040 container_of(work, struct NCR5380_hostdata, coroutine.work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 struct Scsi_Host *instance = hostdata->host;
1042 Scsi_Cmnd *tmp, *prev;
1043 int done;
1044
1045 spin_lock_irq(instance->host_lock);
1046 do {
1047 /* Lock held here */
1048 done = 1;
1049 if (!hostdata->connected && !hostdata->selecting) {
1050 dprintk(NDEBUG_MAIN, ("scsi%d : not connected\n", instance->host_no));
1051 /*
1052 * Search through the issue_queue for a command destined
1053 * for a target that's not busy.
1054 */
1055 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
1056 {
1057 if (prev != tmp)
1058 dprintk(NDEBUG_LISTS, ("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun));
1059 /* When we find one, remove it from the issue queue. */
1060 if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) {
1061 if (prev) {
1062 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
1063 prev->host_scribble = tmp->host_scribble;
1064 } else {
1065 REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble);
1066 hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble;
1067 }
1068 tmp->host_scribble = NULL;
1069
1070 /*
1071 * Attempt to establish an I_T_L nexus here.
1072 * On success, instance->hostdata->connected is set.
1073 * On failure, we must add the command back to the
1074 * issue queue so we can keep trying.
1075 */
1076 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));
1077
1078 /*
1079 * A successful selection is defined as one that
1080 * leaves us with the command connected and
1081 * in hostdata->connected, OR has terminated the
1082 * command.
1083 *
1084 * With successful commands, we fall through
1085 * and see if we can do an information transfer,
1086 * with failures we will restart.
1087 */
1088 hostdata->selecting = NULL;
1089 /* RvC: have to preset this to indicate a new command is being performed */
1090
1091 if (!NCR5380_select(instance, tmp,
1092 /*
1093 * REQUEST SENSE commands are issued without tagged
1094 * queueing, even on SCSI-II devices because the
1095 * contingent allegiance condition exists for the
1096 * entire unit.
1097 */
1098 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
1099 break;
1100 } else {
1101 LIST(tmp, hostdata->issue_queue);
1102 tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1103 hostdata->issue_queue = tmp;
1104 done = 0;
1105 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no));
1106 }
1107 /* lock held here still */
1108 } /* if target/lun is not busy */
1109 } /* for */
1110 /* exited locked */
1111 } /* if (!hostdata->connected) */
1112 if (hostdata->selecting) {
1113 tmp = (Scsi_Cmnd *) hostdata->selecting;
1114 /* Selection will drop and retake the lock */
1115 if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
1116 /* Ok ?? */
1117 } else {
1118 /* RvC: device failed, so we wait a long time
1119 this is needed for Mustek scanners, that
1120 do not respond to commands immediately
1121 after a scan */
1122 printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id);
1123 LIST(tmp, hostdata->issue_queue);
1124 tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1125 hostdata->issue_queue = tmp;
1126 NCR5380_set_timer(hostdata, USLEEP_WAITLONG);
1127 }
1128 } /* if hostdata->selecting */
1129 if (hostdata->connected
1130#ifdef REAL_DMA
1131 && !hostdata->dmalen
1132#endif
1133 && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies))
1134 ) {
1135 dprintk(NDEBUG_MAIN, ("scsi%d : main() : performing information transfer\n", instance->host_no));
1136 NCR5380_information_transfer(instance);
1137 dprintk(NDEBUG_MAIN, ("scsi%d : main() : done set false\n", instance->host_no));
1138 done = 0;
1139 } else
1140 break;
1141 } while (!done);
1142
1143 spin_unlock_irq(instance->host_lock);
1144}
1145
1146#ifndef DONT_USE_INTR
1147
1148/**
1149 * NCR5380_intr - generic NCR5380 irq handler
1150 * @irq: interrupt number
1151 * @dev_id: device info
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 *
1153 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1154 * from the disconnected queue, and restarting NCR5380_main()
1155 * as required.
1156 *
1157 * Locks: takes the needed instance locks
1158 */
1159
Jeff Garzikbaa9aac2007-12-13 16:14:14 -08001160static irqreturn_t NCR5380_intr(int dummy, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161{
1162 NCR5380_local_declare();
Jeff Garzikbaa9aac2007-12-13 16:14:14 -08001163 struct Scsi_Host *instance = dev_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1165 int done;
1166 unsigned char basr;
1167 unsigned long flags;
1168
Jeff Garzikbaa9aac2007-12-13 16:14:14 -08001169 dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n",
1170 instance->irq));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171
1172 do {
1173 done = 1;
1174 spin_lock_irqsave(instance->host_lock, flags);
1175 /* Look for pending interrupts */
1176 NCR5380_setup(instance);
1177 basr = NCR5380_read(BUS_AND_STATUS_REG);
1178 /* XXX dispatch to appropriate routine if found and done=0 */
1179 if (basr & BASR_IRQ) {
1180 NCR5380_dprint(NDEBUG_INTR, instance);
1181 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1182 done = 0;
1183 dprintk(NDEBUG_INTR, ("scsi%d : SEL interrupt\n", instance->host_no));
1184 NCR5380_reselect(instance);
1185 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1186 } else if (basr & BASR_PARITY_ERROR) {
1187 dprintk(NDEBUG_INTR, ("scsi%d : PARITY interrupt\n", instance->host_no));
1188 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1189 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1190 dprintk(NDEBUG_INTR, ("scsi%d : RESET interrupt\n", instance->host_no));
1191 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1192 } else {
1193#if defined(REAL_DMA)
1194 /*
1195 * We should only get PHASE MISMATCH and EOP interrupts
1196 * if we have DMA enabled, so do a sanity check based on
1197 * the current setting of the MODE register.
1198 */
1199
1200 if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) {
1201 int transfered;
1202
1203 if (!hostdata->connected)
1204 panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno);
1205
1206 transfered = (hostdata->dmalen - NCR5380_dma_residual(instance));
1207 hostdata->connected->SCp.this_residual -= transferred;
1208 hostdata->connected->SCp.ptr += transferred;
1209 hostdata->dmalen = 0;
1210
1211 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1212
1213 /* FIXME: we need to poll briefly then defer a workqueue task ! */
1214 NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ);
1215
1216 NCR5380_write(MODE_REG, MR_BASE);
1217 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1218 }
1219#else
1220 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)));
1221 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1222#endif
1223 }
1224 } /* if BASR_IRQ */
1225 spin_unlock_irqrestore(instance->host_lock, flags);
1226 if(!done)
David Howellsc4028952006-11-22 14:57:56 +00001227 schedule_delayed_work(&hostdata->coroutine, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 } while (!done);
1229 return IRQ_HANDLED;
1230}
1231
1232#endif
1233
1234/**
1235 * collect_stats - collect stats on a scsi command
1236 * @hostdata: adapter
1237 * @cmd: command being issued
1238 *
1239 * Update the statistical data by parsing the command in question
1240 */
1241
1242static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd)
1243{
1244#ifdef NCR5380_STATS
1245 switch (cmd->cmnd[0]) {
1246 case WRITE:
1247 case WRITE_6:
1248 case WRITE_10:
Jeff Garzik422c0d62005-10-24 18:05:09 -04001249 hostdata->time_write[scmd_id(cmd)] += (jiffies - hostdata->timebase);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 hostdata->pendingw--;
1251 break;
1252 case READ:
1253 case READ_6:
1254 case READ_10:
Jeff Garzik422c0d62005-10-24 18:05:09 -04001255 hostdata->time_read[scmd_id(cmd)] += (jiffies - hostdata->timebase);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 hostdata->pendingr--;
1257 break;
1258 }
1259#endif
1260}
1261
1262
1263/*
1264 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
1265 * int tag);
1266 *
1267 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1268 * including ARBITRATION, SELECTION, and initial message out for
1269 * IDENTIFY and queue messages.
1270 *
1271 * Inputs : instance - instantiation of the 5380 driver on which this
1272 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1273 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1274 * the command that is presently connected.
1275 *
1276 * Returns : -1 if selection could not execute for some reason,
1277 * 0 if selection succeeded or failed because the target
1278 * did not respond.
1279 *
1280 * Side effects :
1281 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1282 * with registers as they should have been on entry - ie
1283 * SELECT_ENABLE will be set appropriately, the NCR5380
1284 * will cease to drive any SCSI bus signals.
1285 *
1286 * If successful : I_T_L or I_T_L_Q nexus will be established,
1287 * instance->connected will be set to cmd.
1288 * SELECT interrupt will be disabled.
1289 *
1290 * If failed (no target) : cmd->scsi_done() will be called, and the
1291 * cmd->result host byte set to DID_BAD_TARGET.
1292 *
1293 * Locks: caller holds hostdata lock in IRQ mode
1294 */
1295
1296static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag)
1297{
1298 NCR5380_local_declare();
1299 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1300 unsigned char tmp[3], phase;
1301 unsigned char *data;
1302 int len;
1303 unsigned long timeout;
1304 unsigned char value;
1305 int err;
1306 NCR5380_setup(instance);
1307
1308 if (hostdata->selecting)
1309 goto part2;
1310
1311 hostdata->restart_select = 0;
1312
1313 NCR5380_dprint(NDEBUG_ARBITRATION, instance);
1314 dprintk(NDEBUG_ARBITRATION, ("scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id));
1315
1316 /*
1317 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1318 * data bus during SELECTION.
1319 */
1320
1321 NCR5380_write(TARGET_COMMAND_REG, 0);
1322
1323 /*
1324 * Start arbitration.
1325 */
1326
1327 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1328 NCR5380_write(MODE_REG, MR_ARBITRATE);
1329
1330
1331 /* We can be relaxed here, interrupts are on, we are
1332 in workqueue context, the birds are singing in the trees */
1333 spin_unlock_irq(instance->host_lock);
1334 err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ);
1335 spin_lock_irq(instance->host_lock);
1336 if (err < 0) {
1337 printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__);
1338 NCR5380_write(MODE_REG, MR_BASE);
1339 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1340 goto failed;
1341 }
1342
1343 dprintk(NDEBUG_ARBITRATION, ("scsi%d : arbitration complete\n", instance->host_no));
1344
1345 /*
1346 * The arbitration delay is 2.2us, but this is a minimum and there is
1347 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1348 * the integral nature of udelay().
1349 *
1350 */
1351
1352 udelay(3);
1353
1354 /* Check for lost arbitration */
1355 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)) {
1356 NCR5380_write(MODE_REG, MR_BASE);
1357 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no));
1358 goto failed;
1359 }
1360 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL);
1361
1362 if (!(hostdata->flags & FLAG_DTC3181E) &&
1363 /* RvC: DTC3181E has some trouble with this
1364 * so we simply removed it. Seems to work with
1365 * only Mustek scanner attached
1366 */
1367 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
1368 NCR5380_write(MODE_REG, MR_BASE);
1369 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1370 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no));
1371 goto failed;
1372 }
1373 /*
1374 * Again, bus clear + bus settle time is 1.2us, however, this is
1375 * a minimum so we'll udelay ceil(1.2)
1376 */
1377
1378 udelay(2);
1379
1380 dprintk(NDEBUG_ARBITRATION, ("scsi%d : won arbitration\n", instance->host_no));
1381
1382 /*
1383 * Now that we have won arbitration, start Selection process, asserting
1384 * the host and target ID's on the SCSI bus.
1385 */
1386
Jeff Garzik422c0d62005-10-24 18:05:09 -04001387 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd))));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388
1389 /*
1390 * Raise ATN while SEL is true before BSY goes false from arbitration,
1391 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1392 * phase immediately after selection.
1393 */
1394
1395 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1396 NCR5380_write(MODE_REG, MR_BASE);
1397
1398 /*
1399 * Reselect interrupts must be turned off prior to the dropping of BSY,
1400 * otherwise we will trigger an interrupt.
1401 */
1402 NCR5380_write(SELECT_ENABLE_REG, 0);
1403
1404 /*
1405 * The initiator shall then wait at least two deskew delays and release
1406 * the BSY signal.
1407 */
1408 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1409
1410 /* Reset BSY */
1411 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1412
1413 /*
1414 * Something weird happens when we cease to drive BSY - looks
1415 * like the board/chip is letting us do another read before the
1416 * appropriate propagation delay has expired, and we're confusing
1417 * a BSY signal from ourselves as the target's response to SELECTION.
1418 *
1419 * A small delay (the 'C++' frontend breaks the pipeline with an
1420 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1421 * tighter 'C' code breaks and requires this) solves the problem -
1422 * the 1 us delay is arbitrary, and only used because this delay will
1423 * be the same on other platforms and since it works here, it should
1424 * work there.
1425 *
1426 * wingel suggests that this could be due to failing to wait
1427 * one deskew delay.
1428 */
1429
1430 udelay(1);
1431
Jeff Garzik422c0d62005-10-24 18:05:09 -04001432 dprintk(NDEBUG_SELECTION, ("scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433
1434 /*
1435 * The SCSI specification calls for a 250 ms timeout for the actual
1436 * selection.
1437 */
1438
1439 timeout = jiffies + (250 * HZ / 1000);
1440
1441 /*
1442 * XXX very interesting - we're seeing a bounce where the BSY we
1443 * asserted is being reflected / still asserted (propagation delay?)
1444 * and it's detecting as true. Sigh.
1445 */
1446
1447 hostdata->select_time = 0; /* we count the clock ticks at which we polled */
1448 hostdata->selecting = cmd;
1449
1450part2:
1451 /* RvC: here we enter after a sleeping period, or immediately after
1452 execution of part 1
1453 we poll only once ech clock tick */
1454 value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO);
1455
1456 if (!value && (hostdata->select_time < HZ/4)) {
1457 /* RvC: we still must wait for a device response */
1458 hostdata->select_time++; /* after 25 ticks the device has failed */
1459 NCR5380_set_timer(hostdata, 1);
1460 return 0; /* RvC: we return here with hostdata->selecting set,
1461 to go to sleep */
1462 }
1463
1464 hostdata->selecting = NULL;/* clear this pointer, because we passed the
1465 waiting period */
1466 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1467 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1468 NCR5380_reselect(instance);
1469 printk("scsi%d : reselection after won arbitration?\n", instance->host_no);
1470 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1471 return -1;
1472 }
1473 /*
1474 * No less than two deskew delays after the initiator detects the
1475 * BSY signal is true, it shall release the SEL signal and may
1476 * change the DATA BUS. -wingel
1477 */
1478
1479 udelay(1);
1480
1481 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1482
1483 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1484 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
Jeff Garzik422c0d62005-10-24 18:05:09 -04001485 if (hostdata->targets_present & (1 << scmd_id(cmd))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486 printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no);
1487 if (hostdata->restart_select)
1488 printk(KERN_DEBUG "\trestart select\n");
1489 NCR5380_dprint(NDEBUG_SELECTION, instance);
1490 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1491 return -1;
1492 }
1493 cmd->result = DID_BAD_TARGET << 16;
1494 collect_stats(hostdata, cmd);
1495 cmd->scsi_done(cmd);
1496 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1497 dprintk(NDEBUG_SELECTION, ("scsi%d : target did not respond within 250ms\n", instance->host_no));
1498 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1499 return 0;
1500 }
Jeff Garzik422c0d62005-10-24 18:05:09 -04001501 hostdata->targets_present |= (1 << scmd_id(cmd));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502
1503 /*
1504 * Since we followed the SCSI spec, and raised ATN while SEL
1505 * was true but before BSY was false during selection, the information
1506 * transfer phase should be a MESSAGE OUT phase so that we can send the
1507 * IDENTIFY message.
1508 *
1509 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1510 * message (2 bytes) with a tag ID that we increment with every command
1511 * until it wraps back to 0.
1512 *
1513 * XXX - it turns out that there are some broken SCSI-II devices,
1514 * which claim to support tagged queuing but fail when more than
1515 * some number of commands are issued at once.
1516 */
1517
1518 /* Wait for start of REQ/ACK handshake */
1519
1520 spin_unlock_irq(instance->host_lock);
1521 err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ);
1522 spin_lock_irq(instance->host_lock);
1523
1524 if(err) {
1525 printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__);
1526 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1527 goto failed;
1528 }
1529
1530 dprintk(NDEBUG_SELECTION, ("scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id));
1531 tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun);
1532
1533 len = 1;
1534 cmd->tag = 0;
1535
1536 /* Send message(s) */
1537 data = tmp;
1538 phase = PHASE_MSGOUT;
1539 NCR5380_transfer_pio(instance, &phase, &len, &data);
1540 dprintk(NDEBUG_SELECTION, ("scsi%d : nexus established.\n", instance->host_no));
1541 /* XXX need to handle errors here */
1542 hostdata->connected = cmd;
1543 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1544
Boaz Harrosh28424d32007-09-10 22:37:45 +03001545 initialize_SCp(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546
1547 return 0;
1548
1549 /* Selection failed */
1550failed:
1551 return -1;
1552
1553}
1554
1555/*
1556 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1557 * unsigned char *phase, int *count, unsigned char **data)
1558 *
1559 * Purpose : transfers data in given phase using polled I/O
1560 *
1561 * Inputs : instance - instance of driver, *phase - pointer to
1562 * what phase is expected, *count - pointer to number of
1563 * bytes to transfer, **data - pointer to data pointer.
1564 *
1565 * Returns : -1 when different phase is entered without transferring
1566 * maximum number of bytes, 0 if all bytes or transfered or exit
1567 * is in same phase.
1568 *
1569 * Also, *phase, *count, *data are modified in place.
1570 *
1571 * XXX Note : handling for bus free may be useful.
1572 */
1573
1574/*
1575 * Note : this code is not as quick as it could be, however it
1576 * IS 100% reliable, and for the actual data transfer where speed
1577 * counts, we will always do a pseudo DMA or DMA transfer.
1578 */
1579
1580static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1581 NCR5380_local_declare();
1582 unsigned char p = *phase, tmp;
1583 int c = *count;
1584 unsigned char *d = *data;
1585 /*
1586 * RvC: some administrative data to process polling time
1587 */
1588 int break_allowed = 0;
1589 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1590 NCR5380_setup(instance);
1591
1592 if (!(p & SR_IO))
1593 dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c));
1594 else
1595 dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c));
1596
1597 /*
1598 * The NCR5380 chip will only drive the SCSI bus when the
1599 * phase specified in the appropriate bits of the TARGET COMMAND
1600 * REGISTER match the STATUS REGISTER
1601 */
1602
1603 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1604
1605 /* RvC: don't know if this is necessary, but other SCSI I/O is short
1606 * so breaks are not necessary there
1607 */
1608 if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) {
1609 break_allowed = 1;
1610 }
1611 do {
1612 /*
1613 * Wait for assertion of REQ, after which the phase bits will be
1614 * valid
1615 */
1616
1617 /* RvC: we simply poll once, after that we stop temporarily
1618 * and let the device buffer fill up
1619 * if breaking is not allowed, we keep polling as long as needed
1620 */
1621
1622 /* FIXME */
1623 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed);
1624 if (!(tmp & SR_REQ)) {
1625 /* timeout condition */
1626 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
1627 break;
1628 }
1629
1630 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no));
1631
1632 /* Check for phase mismatch */
1633 if ((tmp & PHASE_MASK) != p) {
1634 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no));
1635 NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance);
1636 break;
1637 }
1638 /* Do actual transfer from SCSI bus to / from memory */
1639 if (!(p & SR_IO))
1640 NCR5380_write(OUTPUT_DATA_REG, *d);
1641 else
1642 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1643
1644 ++d;
1645
1646 /*
1647 * The SCSI standard suggests that in MSGOUT phase, the initiator
1648 * should drop ATN on the last byte of the message phase
1649 * after REQ has been asserted for the handshake but before
1650 * the initiator raises ACK.
1651 */
1652
1653 if (!(p & SR_IO)) {
1654 if (!((p & SR_MSG) && c > 1)) {
1655 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1656 NCR5380_dprint(NDEBUG_PIO, instance);
1657 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1658 } else {
1659 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1660 NCR5380_dprint(NDEBUG_PIO, instance);
1661 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1662 }
1663 } else {
1664 NCR5380_dprint(NDEBUG_PIO, instance);
1665 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1666 }
1667
1668 /* FIXME - if this fails bus reset ?? */
1669 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ);
1670 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no));
1671
1672/*
1673 * We have several special cases to consider during REQ/ACK handshaking :
1674 * 1. We were in MSGOUT phase, and we are on the last byte of the
1675 * message. ATN must be dropped as ACK is dropped.
1676 *
1677 * 2. We are in a MSGIN phase, and we are on the last byte of the
1678 * message. We must exit with ACK asserted, so that the calling
1679 * code may raise ATN before dropping ACK to reject the message.
1680 *
1681 * 3. ACK and ATN are clear and the target may proceed as normal.
1682 */
1683 if (!(p == PHASE_MSGIN && c == 1)) {
1684 if (p == PHASE_MSGOUT && c > 1)
1685 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1686 else
1687 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1688 }
1689 } while (--c);
1690
1691 dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c));
1692
1693 *count = c;
1694 *data = d;
1695 tmp = NCR5380_read(STATUS_REG);
1696 if (tmp & SR_REQ)
1697 *phase = tmp & PHASE_MASK;
1698 else
1699 *phase = PHASE_UNKNOWN;
1700
1701 if (!c || (*phase == p))
1702 return 0;
1703 else
1704 return -1;
1705}
1706
1707/**
1708 * do_reset - issue a reset command
1709 * @host: adapter to reset
1710 *
1711 * Issue a reset sequence to the NCR5380 and try and get the bus
1712 * back into sane shape.
1713 *
1714 * Locks: caller holds queue lock
1715 */
1716
1717static void do_reset(struct Scsi_Host *host) {
1718 NCR5380_local_declare();
1719 NCR5380_setup(host);
1720
1721 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
1722 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
1723 udelay(25);
1724 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1725}
1726
1727/*
1728 * Function : do_abort (Scsi_Host *host)
1729 *
1730 * Purpose : abort the currently established nexus. Should only be
1731 * called from a routine which can drop into a
1732 *
1733 * Returns : 0 on success, -1 on failure.
1734 *
1735 * Locks: queue lock held by caller
1736 * FIXME: sort this out and get new_eh running
1737 */
1738
1739static int do_abort(struct Scsi_Host *host) {
1740 NCR5380_local_declare();
1741 unsigned char *msgptr, phase, tmp;
1742 int len;
1743 int rc;
1744 NCR5380_setup(host);
1745
1746
1747 /* Request message out phase */
1748 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1749
1750 /*
1751 * Wait for the target to indicate a valid phase by asserting
1752 * REQ. Once this happens, we'll have either a MSGOUT phase
1753 * and can immediately send the ABORT message, or we'll have some
1754 * other phase and will have to source/sink data.
1755 *
1756 * We really don't care what value was on the bus or what value
1757 * the target sees, so we just handshake.
1758 */
1759
1760 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ);
1761
1762 if(rc < 0)
1763 return -1;
1764
1765 tmp = (unsigned char)rc;
1766
1767 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1768
1769 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1770 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1771 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ);
1772 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1773 if(rc == -1)
1774 return -1;
1775 }
1776 tmp = ABORT;
1777 msgptr = &tmp;
1778 len = 1;
1779 phase = PHASE_MSGOUT;
1780 NCR5380_transfer_pio(host, &phase, &len, &msgptr);
1781
1782 /*
1783 * If we got here, and the command completed successfully,
1784 * we're about to go into bus free state.
1785 */
1786
1787 return len ? -1 : 0;
1788}
1789
1790#if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL)
1791/*
1792 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1793 * unsigned char *phase, int *count, unsigned char **data)
1794 *
1795 * Purpose : transfers data in given phase using either real
1796 * or pseudo DMA.
1797 *
1798 * Inputs : instance - instance of driver, *phase - pointer to
1799 * what phase is expected, *count - pointer to number of
1800 * bytes to transfer, **data - pointer to data pointer.
1801 *
1802 * Returns : -1 when different phase is entered without transferring
1803 * maximum number of bytes, 0 if all bytes or transfered or exit
1804 * is in same phase.
1805 *
1806 * Also, *phase, *count, *data are modified in place.
1807 *
1808 * Locks: io_request lock held by caller
1809 */
1810
1811
1812static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1813 NCR5380_local_declare();
1814 register int c = *count;
1815 register unsigned char p = *phase;
1816 register unsigned char *d = *data;
1817 unsigned char tmp;
1818 int foo;
1819#if defined(REAL_DMA_POLL)
1820 int cnt, toPIO;
1821 unsigned char saved_data = 0, overrun = 0, residue;
1822#endif
1823
1824 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1825
1826 NCR5380_setup(instance);
1827
1828 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1829 *phase = tmp;
1830 return -1;
1831 }
1832#if defined(REAL_DMA) || defined(REAL_DMA_POLL)
1833#ifdef READ_OVERRUNS
1834 if (p & SR_IO) {
1835 c -= 2;
1836 }
1837#endif
1838 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));
1839 hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c);
1840#endif
1841
1842 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1843
1844#ifdef REAL_DMA
1845 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
1846#elif defined(REAL_DMA_POLL)
1847 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
1848#else
1849 /*
1850 * Note : on my sample board, watch-dog timeouts occurred when interrupts
1851 * were not disabled for the duration of a single DMA transfer, from
1852 * before the setting of DMA mode to after transfer of the last byte.
1853 */
1854
1855#if defined(PSEUDO_DMA) && defined(UNSAFE)
1856 spin_unlock_irq(instance->host_lock);
1857#endif
1858 /* KLL May need eop and parity in 53c400 */
1859 if (hostdata->flags & FLAG_NCR53C400)
1860 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR | MR_ENABLE_EOP_INTR | MR_DMA_MODE | MR_MONITOR_BSY);
1861 else
1862 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
1863#endif /* def REAL_DMA */
1864
1865 dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG)));
1866
1867 /*
1868 * On the PAS16 at least I/O recovery delays are not needed here.
1869 * Everyone else seems to want them.
1870 */
1871
1872 if (p & SR_IO) {
1873 io_recovery_delay(1);
1874 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1875 } else {
1876 io_recovery_delay(1);
1877 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1878 io_recovery_delay(1);
1879 NCR5380_write(START_DMA_SEND_REG, 0);
1880 io_recovery_delay(1);
1881 }
1882
1883#if defined(REAL_DMA_POLL)
1884 do {
1885 tmp = NCR5380_read(BUS_AND_STATUS_REG);
1886 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER)));
1887
1888/*
1889 At this point, either we've completed DMA, or we have a phase mismatch,
1890 or we've unexpectedly lost BUSY (which is a real error).
1891
1892 For write DMAs, we want to wait until the last byte has been
1893 transferred out over the bus before we turn off DMA mode. Alas, there
1894 seems to be no terribly good way of doing this on a 5380 under all
1895 conditions. For non-scatter-gather operations, we can wait until REQ
1896 and ACK both go false, or until a phase mismatch occurs. Gather-writes
1897 are nastier, since the device will be expecting more data than we
1898 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
1899 could test LAST BIT SENT to assure transfer (I imagine this is precisely
1900 why this signal was added to the newer chips) but on the older 538[01]
1901 this signal does not exist. The workaround for this lack is a watchdog;
1902 we bail out of the wait-loop after a modest amount of wait-time if
1903 the usual exit conditions are not met. Not a terribly clean or
1904 correct solution :-%
1905
1906 Reads are equally tricky due to a nasty characteristic of the NCR5380.
1907 If the chip is in DMA mode for an READ, it will respond to a target's
1908 REQ by latching the SCSI data into the INPUT DATA register and asserting
1909 ACK, even if it has _already_ been notified by the DMA controller that
1910 the current DMA transfer has completed! If the NCR5380 is then taken
1911 out of DMA mode, this already-acknowledged byte is lost.
1912
1913 This is not a problem for "one DMA transfer per command" reads, because
1914 the situation will never arise... either all of the data is DMA'ed
1915 properly, or the target switches to MESSAGE IN phase to signal a
1916 disconnection (either operation bringing the DMA to a clean halt).
1917 However, in order to handle scatter-reads, we must work around the
1918 problem. The chosen fix is to DMA N-2 bytes, then check for the
1919 condition before taking the NCR5380 out of DMA mode. One or two extra
1920 bytes are transferred via PIO as necessary to fill out the original
1921 request.
1922 */
1923
1924 if (p & SR_IO) {
1925#ifdef READ_OVERRUNS
1926 udelay(10);
1927 if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) {
1928 saved_data = NCR5380_read(INPUT_DATA_REGISTER);
1929 overrun = 1;
1930 }
1931#endif
1932 } else {
1933 int limit = 100;
1934 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) {
1935 if (!(tmp & BASR_PHASE_MATCH))
1936 break;
1937 if (--limit < 0)
1938 break;
1939 }
1940 }
1941
1942 dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG)));
1943
1944 NCR5380_write(MODE_REG, MR_BASE);
1945 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1946
1947 residue = NCR5380_dma_residual(instance);
1948 c -= residue;
1949 *count -= c;
1950 *data += c;
1951 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
1952
1953#ifdef READ_OVERRUNS
1954 if (*phase == p && (p & SR_IO) && residue == 0) {
1955 if (overrun) {
1956 dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n"));
1957 **data = saved_data;
1958 *data += 1;
1959 *count -= 1;
1960 cnt = toPIO = 1;
1961 } else {
1962 printk("No overrun??\n");
1963 cnt = toPIO = 2;
1964 }
1965 dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data));
1966 NCR5380_transfer_pio(instance, phase, &cnt, data);
1967 *count -= toPIO - cnt;
1968 }
1969#endif
1970
1971 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)));
1972 return 0;
1973
1974#elif defined(REAL_DMA)
1975 return 0;
1976#else /* defined(REAL_DMA_POLL) */
1977 if (p & SR_IO) {
1978#ifdef DMA_WORKS_RIGHT
1979 foo = NCR5380_pread(instance, d, c);
1980#else
1981 int diff = 1;
1982 if (hostdata->flags & FLAG_NCR53C400) {
1983 diff = 0;
1984 }
1985 if (!(foo = NCR5380_pread(instance, d, c - diff))) {
1986 /*
1987 * We can't disable DMA mode after successfully transferring
1988 * what we plan to be the last byte, since that would open up
1989 * a race condition where if the target asserted REQ before
1990 * we got the DMA mode reset, the NCR5380 would have latched
1991 * an additional byte into the INPUT DATA register and we'd
1992 * have dropped it.
1993 *
1994 * The workaround was to transfer one fewer bytes than we
1995 * intended to with the pseudo-DMA read function, wait for
1996 * the chip to latch the last byte, read it, and then disable
1997 * pseudo-DMA mode.
1998 *
1999 * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
2000 * REQ is deasserted when ACK is asserted, and not reasserted
2001 * until ACK goes false. Since the NCR5380 won't lower ACK
2002 * until DACK is asserted, which won't happen unless we twiddle
2003 * the DMA port or we take the NCR5380 out of DMA mode, we
2004 * can guarantee that we won't handshake another extra
2005 * byte.
2006 */
2007
2008 if (!(hostdata->flags & FLAG_NCR53C400)) {
2009 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ));
2010 /* Wait for clean handshake */
2011 while (NCR5380_read(STATUS_REG) & SR_REQ);
2012 d[c - 1] = NCR5380_read(INPUT_DATA_REG);
2013 }
2014 }
2015#endif
2016 } else {
2017#ifdef DMA_WORKS_RIGHT
2018 foo = NCR5380_pwrite(instance, d, c);
2019#else
2020 int timeout;
2021 dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c));
2022 if (!(foo = NCR5380_pwrite(instance, d, c))) {
2023 /*
2024 * Wait for the last byte to be sent. If REQ is being asserted for
2025 * the byte we're interested, we'll ACK it and it will go false.
2026 */
2027 if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) {
2028 timeout = 20000;
2029 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH));
2030
2031 if (!timeout)
2032 dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no));
2033
2034 if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) {
2035 hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT;
2036 if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) {
2037 hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT;
2038 dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no));
2039 }
2040 }
2041 } else {
2042 dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n"));
2043 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT));
2044 dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n"));
2045 }
2046 }
2047#endif
2048 }
2049 NCR5380_write(MODE_REG, MR_BASE);
2050 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2051
2052 if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) {
2053 dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n"));
2054 if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) {
2055 dprintk(NDEBUG_C400_PWRITE, ("53C400w: got it, reading reset interrupt reg\n"));
2056 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
2057 } else {
2058 printk("53C400w: IRQ NOT THERE!\n");
2059 }
2060 }
2061 *data = d + c;
2062 *count = 0;
2063 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
2064#if defined(PSEUDO_DMA) && defined(UNSAFE)
2065 spin_lock_irq(instance->host_lock);
2066#endif /* defined(REAL_DMA_POLL) */
2067 return foo;
2068#endif /* def REAL_DMA */
2069}
2070#endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */
2071
2072/*
2073 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
2074 *
2075 * Purpose : run through the various SCSI phases and do as the target
2076 * directs us to. Operates on the currently connected command,
2077 * instance->connected.
2078 *
2079 * Inputs : instance, instance for which we are doing commands
2080 *
2081 * Side effects : SCSI things happen, the disconnected queue will be
2082 * modified if a command disconnects, *instance->connected will
2083 * change.
2084 *
2085 * XXX Note : we need to watch for bus free or a reset condition here
2086 * to recover from an unexpected bus free condition.
2087 *
2088 * Locks: io_request_lock held by caller in IRQ mode
2089 */
2090
2091static void NCR5380_information_transfer(struct Scsi_Host *instance) {
2092 NCR5380_local_declare();
2093 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata;
2094 unsigned char msgout = NOP;
2095 int sink = 0;
2096 int len;
2097#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2098 int transfersize;
2099#endif
2100 unsigned char *data;
2101 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
2102 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
2103 /* RvC: we need to set the end of the polling time */
2104 unsigned long poll_time = jiffies + USLEEP_POLL;
2105
2106 NCR5380_setup(instance);
2107
2108 while (1) {
2109 tmp = NCR5380_read(STATUS_REG);
2110 /* We only have a valid SCSI phase when REQ is asserted */
2111 if (tmp & SR_REQ) {
2112 phase = (tmp & PHASE_MASK);
2113 if (phase != old_phase) {
2114 old_phase = phase;
2115 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance);
2116 }
2117 if (sink && (phase != PHASE_MSGOUT)) {
2118 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2119
2120 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
2121 while (NCR5380_read(STATUS_REG) & SR_REQ);
2122 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2123 sink = 0;
2124 continue;
2125 }
2126 switch (phase) {
2127 case PHASE_DATAIN:
2128 case PHASE_DATAOUT:
2129#if (NDEBUG & NDEBUG_NO_DATAOUT)
2130 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no);
2131 sink = 1;
2132 do_abort(instance);
2133 cmd->result = DID_ERROR << 16;
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04002134 cmd->scsi_done(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002135 return;
2136#endif
2137 /*
2138 * If there is no room left in the current buffer in the
2139 * scatter-gather list, move onto the next one.
2140 */
2141
2142 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2143 ++cmd->SCp.buffer;
2144 --cmd->SCp.buffers_residual;
2145 cmd->SCp.this_residual = cmd->SCp.buffer->length;
Jens Axboe45711f12007-10-22 21:19:53 +02002146 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002147 dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual));
2148 }
2149 /*
2150 * The preferred transfer method is going to be
2151 * PSEUDO-DMA for systems that are strictly PIO,
2152 * since we can let the hardware do the handshaking.
2153 *
2154 * For this to work, we need to know the transfersize
2155 * ahead of time, since the pseudo-DMA code will sit
2156 * in an unconditional loop.
2157 */
2158
2159#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2160 /* KLL
2161 * PSEUDO_DMA is defined here. If this is the g_NCR5380
2162 * driver then it will always be defined, so the
2163 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
2164 * NCR5380 case. I think this is a fairly clean solution.
2165 * We supplement these 2 if's with the flag.
2166 */
2167#ifdef NCR5380_dma_xfer_len
2168 if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) {
2169#else
2170 transfersize = cmd->transfersize;
2171
2172#ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */
2173 if (transfersize > 512)
2174 transfersize = 512;
2175#endif /* LIMIT_TRANSFERSIZE */
2176
2177 if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) {
2178 /* Limit transfers to 32K, for xx400 & xx406
2179 * pseudoDMA that transfers in 128 bytes blocks. */
2180 if (transfersize > 32 * 1024)
2181 transfersize = 32 * 1024;
2182#endif
2183 len = transfersize;
2184 if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) {
2185 /*
2186 * If the watchdog timer fires, all future accesses to this
2187 * device will use the polled-IO.
2188 */
Jeff Garzik017560f2005-10-24 18:04:36 -04002189 scmd_printk(KERN_INFO, cmd,
2190 "switching to slow handshake\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002191 cmd->device->borken = 1;
2192 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2193 sink = 1;
2194 do_abort(instance);
2195 cmd->result = DID_ERROR << 16;
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04002196 cmd->scsi_done(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002197 /* XXX - need to source or sink data here, as appropriate */
2198 } else
2199 cmd->SCp.this_residual -= transfersize - len;
2200 } else
2201#endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */
2202 NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **)
2203 &cmd->SCp.ptr);
2204 break;
2205 case PHASE_MSGIN:
2206 len = 1;
2207 data = &tmp;
2208 NCR5380_transfer_pio(instance, &phase, &len, &data);
2209 cmd->SCp.Message = tmp;
2210
2211 switch (tmp) {
2212 /*
2213 * Linking lets us reduce the time required to get the
2214 * next command out to the device, hopefully this will
2215 * mean we don't waste another revolution due to the delays
2216 * required by ARBITRATION and another SELECTION.
2217 *
2218 * In the current implementation proposal, low level drivers
2219 * merely have to start the next command, pointed to by
2220 * next_link, done() is called as with unlinked commands.
2221 */
2222#ifdef LINKED
2223 case LINKED_CMD_COMPLETE:
2224 case LINKED_FLG_CMD_COMPLETE:
2225 /* Accept message by clearing ACK */
2226 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2227 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun));
2228 /*
2229 * Sanity check : A linked command should only terminate with
2230 * one of these messages if there are more linked commands
2231 * available.
2232 */
2233 if (!cmd->next_link) {
2234 printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun);
2235 sink = 1;
2236 do_abort(instance);
2237 return;
2238 }
2239 initialize_SCp(cmd->next_link);
2240 /* The next command is still part of this process */
2241 cmd->next_link->tag = cmd->tag;
2242 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2243 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));
2244 collect_stats(hostdata, cmd);
2245 cmd->scsi_done(cmd);
2246 cmd = hostdata->connected;
2247 break;
2248#endif /* def LINKED */
2249 case ABORT:
2250 case COMMAND_COMPLETE:
2251 /* Accept message by clearing ACK */
2252 sink = 1;
2253 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2254 hostdata->connected = NULL;
2255 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun));
2256 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2257
2258 /*
2259 * I'm not sure what the correct thing to do here is :
2260 *
2261 * If the command that just executed is NOT a request
2262 * sense, the obvious thing to do is to set the result
2263 * code to the values of the stored parameters.
2264 *
2265 * If it was a REQUEST SENSE command, we need some way
2266 * to differentiate between the failure code of the original
2267 * and the failure code of the REQUEST sense - the obvious
2268 * case is success, where we fall through and leave the result
2269 * code unchanged.
2270 *
2271 * The non-obvious place is where the REQUEST SENSE failed
2272 */
2273
2274 if (cmd->cmnd[0] != REQUEST_SENSE)
2275 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2276 else if (status_byte(cmd->SCp.Status) != GOOD)
2277 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2278
2279#ifdef AUTOSENSE
Boaz Harrosh28424d32007-09-10 22:37:45 +03002280 if ((cmd->cmnd[0] == REQUEST_SENSE) &&
2281 hostdata->ses.cmd_len) {
2282 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
2283 hostdata->ses.cmd_len = 0 ;
2284 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002285
Boaz Harrosh28424d32007-09-10 22:37:45 +03002286 if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2287 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
2288
2289 dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002290
2291 LIST(cmd, hostdata->issue_queue);
2292 cmd->host_scribble = (unsigned char *)
2293 hostdata->issue_queue;
2294 hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2295 dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no));
2296 } else
2297#endif /* def AUTOSENSE */
2298 {
2299 collect_stats(hostdata, cmd);
2300 cmd->scsi_done(cmd);
2301 }
2302
2303 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2304 /*
2305 * Restore phase bits to 0 so an interrupted selection,
2306 * arbitration can resume.
2307 */
2308 NCR5380_write(TARGET_COMMAND_REG, 0);
2309
2310 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2311 barrier();
2312 return;
2313 case MESSAGE_REJECT:
2314 /* Accept message by clearing ACK */
2315 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2316 switch (hostdata->last_message) {
2317 case HEAD_OF_QUEUE_TAG:
2318 case ORDERED_QUEUE_TAG:
2319 case SIMPLE_QUEUE_TAG:
2320 cmd->device->simple_tags = 0;
2321 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2322 break;
2323 default:
2324 break;
2325 }
2326 case DISCONNECT:{
2327 /* Accept message by clearing ACK */
2328 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2329 cmd->device->disconnect = 1;
2330 LIST(cmd, hostdata->disconnected_queue);
2331 cmd->host_scribble = (unsigned char *)
2332 hostdata->disconnected_queue;
2333 hostdata->connected = NULL;
2334 hostdata->disconnected_queue = cmd;
2335 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));
2336 /*
2337 * Restore phase bits to 0 so an interrupted selection,
2338 * arbitration can resume.
2339 */
2340 NCR5380_write(TARGET_COMMAND_REG, 0);
2341
2342 /* Enable reselect interrupts */
2343 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2344 /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/
2345 /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */
2346 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2347 barrier();
2348 return;
2349 }
2350 /*
2351 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2352 * operation, in violation of the SCSI spec so we can safely
2353 * ignore SAVE/RESTORE pointers calls.
2354 *
2355 * Unfortunately, some disks violate the SCSI spec and
2356 * don't issue the required SAVE_POINTERS message before
2357 * disconnecting, and we have to break spec to remain
2358 * compatible.
2359 */
2360 case SAVE_POINTERS:
2361 case RESTORE_POINTERS:
2362 /* Accept message by clearing ACK */
2363 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2364 break;
2365 case EXTENDED_MESSAGE:
2366/*
2367 * Extended messages are sent in the following format :
2368 * Byte
2369 * 0 EXTENDED_MESSAGE == 1
2370 * 1 length (includes one byte for code, doesn't
2371 * include first two bytes)
2372 * 2 code
2373 * 3..length+1 arguments
2374 *
2375 * Start the extended message buffer with the EXTENDED_MESSAGE
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002376 * byte, since spi_print_msg() wants the whole thing.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002377 */
2378 extended_msg[0] = EXTENDED_MESSAGE;
2379 /* Accept first byte by clearing ACK */
2380 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2381 dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no));
2382
2383 len = 2;
2384 data = extended_msg + 1;
2385 phase = PHASE_MSGIN;
2386 NCR5380_transfer_pio(instance, &phase, &len, &data);
2387
2388 dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2]));
2389
2390 if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) {
2391 /* Accept third byte by clearing ACK */
2392 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2393 len = extended_msg[1] - 1;
2394 data = extended_msg + 3;
2395 phase = PHASE_MSGIN;
2396
2397 NCR5380_transfer_pio(instance, &phase, &len, &data);
2398 dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len));
2399
2400 switch (extended_msg[2]) {
2401 case EXTENDED_SDTR:
2402 case EXTENDED_WDTR:
2403 case EXTENDED_MODIFY_DATA_POINTER:
2404 case EXTENDED_EXTENDED_IDENTIFY:
2405 tmp = 0;
2406 }
2407 } else if (len) {
2408 printk("scsi%d: error receiving extended message\n", instance->host_no);
2409 tmp = 0;
2410 } else {
2411 printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]);
2412 tmp = 0;
2413 }
2414 /* Fall through to reject message */
2415
2416 /*
2417 * If we get something weird that we aren't expecting,
2418 * reject it.
2419 */
2420 default:
2421 if (!tmp) {
2422 printk("scsi%d: rejecting message ", instance->host_no);
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002423 spi_print_msg(extended_msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002424 printk("\n");
2425 } else if (tmp != EXTENDED_MESSAGE)
Jeff Garzik017560f2005-10-24 18:04:36 -04002426 scmd_printk(KERN_INFO, cmd,
2427 "rejecting unknown message %02x\n",tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002428 else
Jeff Garzik017560f2005-10-24 18:04:36 -04002429 scmd_printk(KERN_INFO, cmd,
2430 "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002431
2432 msgout = MESSAGE_REJECT;
2433 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2434 break;
2435 } /* switch (tmp) */
2436 break;
2437 case PHASE_MSGOUT:
2438 len = 1;
2439 data = &msgout;
2440 hostdata->last_message = msgout;
2441 NCR5380_transfer_pio(instance, &phase, &len, &data);
2442 if (msgout == ABORT) {
2443 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2444 hostdata->connected = NULL;
2445 cmd->result = DID_ERROR << 16;
2446 collect_stats(hostdata, cmd);
2447 cmd->scsi_done(cmd);
2448 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2449 return;
2450 }
2451 msgout = NOP;
2452 break;
2453 case PHASE_CMDOUT:
2454 len = cmd->cmd_len;
2455 data = cmd->cmnd;
2456 /*
2457 * XXX for performance reasons, on machines with a
2458 * PSEUDO-DMA architecture we should probably
2459 * use the dma transfer function.
2460 */
2461 NCR5380_transfer_pio(instance, &phase, &len, &data);
2462 if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) {
2463 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
2464 dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
2465 return;
2466 }
2467 break;
2468 case PHASE_STATIN:
2469 len = 1;
2470 data = &tmp;
2471 NCR5380_transfer_pio(instance, &phase, &len, &data);
2472 cmd->SCp.Status = tmp;
2473 break;
2474 default:
2475 printk("scsi%d : unknown phase\n", instance->host_no);
2476 NCR5380_dprint(NDEBUG_ALL, instance);
2477 } /* switch(phase) */
2478 } /* if (tmp * SR_REQ) */
2479 else {
2480 /* RvC: go to sleep if polling time expired
2481 */
2482 if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) {
2483 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
2484 dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
2485 return;
2486 }
2487 }
2488 } /* while (1) */
2489}
2490
2491/*
2492 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2493 *
2494 * Purpose : does reselection, initializing the instance->connected
2495 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2496 * nexus has been reestablished,
2497 *
2498 * Inputs : instance - this instance of the NCR5380.
2499 *
2500 * Locks: io_request_lock held by caller if IRQ driven
2501 */
2502
2503static void NCR5380_reselect(struct Scsi_Host *instance) {
2504 NCR5380_local_declare();
2505 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
2506 instance->hostdata;
2507 unsigned char target_mask;
2508 unsigned char lun, phase;
2509 int len;
2510 unsigned char msg[3];
2511 unsigned char *data;
2512 Scsi_Cmnd *tmp = NULL, *prev;
2513 int abort = 0;
2514 NCR5380_setup(instance);
2515
2516 /*
2517 * Disable arbitration, etc. since the host adapter obviously
2518 * lost, and tell an interrupted NCR5380_select() to restart.
2519 */
2520
2521 NCR5380_write(MODE_REG, MR_BASE);
2522 hostdata->restart_select = 1;
2523
2524 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2525 dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no));
2526
2527 /*
2528 * At this point, we have detected that our SCSI ID is on the bus,
2529 * SEL is true and BSY was false for at least one bus settle delay
2530 * (400 ns).
2531 *
2532 * We must assert BSY ourselves, until the target drops the SEL
2533 * signal.
2534 */
2535
2536 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2537
2538 /* FIXME: timeout too long, must fail to workqueue */
2539 if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0)
2540 abort = 1;
2541
2542 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2543
2544 /*
2545 * Wait for target to go into MSGIN.
2546 * FIXME: timeout needed and fail to work queeu
2547 */
2548
2549 if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ))
2550 abort = 1;
2551
2552 len = 1;
2553 data = msg;
2554 phase = PHASE_MSGIN;
2555 NCR5380_transfer_pio(instance, &phase, &len, &data);
2556
2557 if (!(msg[0] & 0x80)) {
2558 printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no);
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002559 spi_print_msg(msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002560 abort = 1;
2561 } else {
2562 /* Accept message by clearing ACK */
2563 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2564 lun = (msg[0] & 0x07);
2565
2566 /*
2567 * We need to add code for SCSI-II to track which devices have
2568 * I_T_L_Q nexuses established, and which have simple I_T_L
2569 * nexuses so we can chose to do additional data transfer.
2570 */
2571
2572 /*
2573 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2574 * just reestablished, and remove it from the disconnected queue.
2575 */
2576
2577
2578 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
2579 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2580 ) {
2581 if (prev) {
2582 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
2583 prev->host_scribble = tmp->host_scribble;
2584 } else {
2585 REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble);
2586 hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble;
2587 }
2588 tmp->host_scribble = NULL;
2589 break;
2590 }
2591 if (!tmp) {
2592 printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun);
2593 /*
2594 * Since we have an established nexus that we can't do anything with,
2595 * we must abort it.
2596 */
2597 abort = 1;
2598 }
2599 }
2600
2601 if (abort) {
2602 do_abort(instance);
2603 } else {
2604 hostdata->connected = tmp;
2605 dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag));
2606 }
2607}
2608
2609/*
2610 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
2611 *
2612 * Purpose : called by interrupt handler when DMA finishes or a phase
2613 * mismatch occurs (which would finish the DMA transfer).
2614 *
2615 * Inputs : instance - this instance of the NCR5380.
2616 *
2617 * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L
2618 * nexus has been reestablished, on failure NULL is returned.
2619 */
2620
2621#ifdef REAL_DMA
2622static void NCR5380_dma_complete(NCR5380_instance * instance) {
2623 NCR5380_local_declare();
Yoann Padioleauf8343682007-06-01 00:46:36 -07002624 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002625 int transferred;
2626 NCR5380_setup(instance);
2627
2628 /*
2629 * XXX this might not be right.
2630 *
2631 * Wait for final byte to transfer, ie wait for ACK to go false.
2632 *
2633 * We should use the Last Byte Sent bit, unfortunately this is
2634 * not available on the 5380/5381 (only the various CMOS chips)
2635 *
2636 * FIXME: timeout, and need to handle long timeout/irq case
2637 */
2638
2639 NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ);
2640
2641 NCR5380_write(MODE_REG, MR_BASE);
2642 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2643
2644 /*
2645 * The only places we should see a phase mismatch and have to send
2646 * data from the same set of pointers will be the data transfer
2647 * phases. So, residual, requested length are only important here.
2648 */
2649
2650 if (!(hostdata->connected->SCp.phase & SR_CD)) {
2651 transferred = instance->dmalen - NCR5380_dma_residual();
2652 hostdata->connected->SCp.this_residual -= transferred;
2653 hostdata->connected->SCp.ptr += transferred;
2654 }
2655}
2656#endif /* def REAL_DMA */
2657
2658/*
2659 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2660 *
2661 * Purpose : abort a command
2662 *
2663 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2664 * host byte of the result field to, if zero DID_ABORTED is
2665 * used.
2666 *
2667 * Returns : 0 - success, -1 on failure.
2668 *
2669 * XXX - there is no way to abort the command that is currently
2670 * connected, you have to wait for it to complete. If this is
2671 * a problem, we could implement longjmp() / setjmp(), setjmp()
2672 * called where the loop started in NCR5380_main().
2673 *
2674 * Locks: host lock taken by caller
2675 */
2676
2677static int NCR5380_abort(Scsi_Cmnd * cmd) {
2678 NCR5380_local_declare();
2679 struct Scsi_Host *instance = cmd->device->host;
2680 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
2681 Scsi_Cmnd *tmp, **prev;
2682
2683 printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no);
db9dff32005-04-03 14:53:59 -05002684 scsi_print_command(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002685
2686 NCR5380_print_status(instance);
2687
2688 NCR5380_setup(instance);
2689
2690 dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no));
2691 dprintk(NDEBUG_ABORT, (" basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG)));
2692
2693#if 0
2694/*
2695 * Case 1 : If the command is the currently executing command,
2696 * we'll set the aborted flag and return control so that
2697 * information transfer routine can exit cleanly.
2698 */
2699
2700 if (hostdata->connected == cmd) {
2701 dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no));
2702 hostdata->aborted = 1;
2703/*
2704 * We should perform BSY checking, and make sure we haven't slipped
2705 * into BUS FREE.
2706 */
2707
2708 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN);
2709/*
2710 * Since we can't change phases until we've completed the current
2711 * handshake, we have to source or sink a byte of data if the current
2712 * phase is not MSGOUT.
2713 */
2714
2715/*
2716 * Return control to the executing NCR drive so we can clear the
2717 * aborted flag and get back into our main loop.
2718 */
2719
2720 return 0;
2721 }
2722#endif
2723
2724/*
2725 * Case 2 : If the command hasn't been issued yet, we simply remove it
2726 * from the issue queue.
2727 */
2728
2729 dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no));
2730 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)
2731 if (cmd == tmp) {
2732 REMOVE(5, *prev, tmp, tmp->host_scribble);
2733 (*prev) = (Scsi_Cmnd *) tmp->host_scribble;
2734 tmp->host_scribble = NULL;
2735 tmp->result = DID_ABORT << 16;
2736 dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no));
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04002737 tmp->scsi_done(tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002738 return SUCCESS;
2739 }
2740#if (NDEBUG & NDEBUG_ABORT)
2741 /* KLL */
2742 else if (prev == tmp)
2743 printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no);
2744#endif
2745
2746/*
2747 * Case 3 : If any commands are connected, we're going to fail the abort
2748 * and let the high level SCSI driver retry at a later time or
2749 * issue a reset.
2750 *
2751 * Timeouts, and therefore aborted commands, will be highly unlikely
2752 * and handling them cleanly in this situation would make the common
2753 * case of noresets less efficient, and would pollute our code. So,
2754 * we fail.
2755 */
2756
2757 if (hostdata->connected) {
2758 dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no));
2759 return FAILED;
2760 }
2761/*
2762 * Case 4: If the command is currently disconnected from the bus, and
2763 * there are no connected commands, we reconnect the I_T_L or
2764 * I_T_L_Q nexus associated with it, go into message out, and send
2765 * an abort message.
2766 *
2767 * This case is especially ugly. In order to reestablish the nexus, we
2768 * need to call NCR5380_select(). The easiest way to implement this
2769 * function was to abort if the bus was busy, and let the interrupt
2770 * handler triggered on the SEL for reselect take care of lost arbitrations
2771 * where necessary, meaning interrupts need to be enabled.
2772 *
2773 * When interrupts are enabled, the queues may change - so we
2774 * can't remove it from the disconnected queue before selecting it
2775 * because that could cause a failure in hashing the nexus if that
2776 * device reselected.
2777 *
2778 * Since the queues may change, we can't use the pointers from when we
2779 * first locate it.
2780 *
2781 * So, we must first locate the command, and if NCR5380_select()
2782 * succeeds, then issue the abort, relocate the command and remove
2783 * it from the disconnected queue.
2784 */
2785
2786 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble)
2787 if (cmd == tmp) {
2788 dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no));
2789
2790 if (NCR5380_select(instance, cmd, (int) cmd->tag))
2791 return FAILED;
2792 dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no));
2793
2794 do_abort(instance);
2795
2796 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)
2797 if (cmd == tmp) {
2798 REMOVE(5, *prev, tmp, tmp->host_scribble);
2799 *prev = (Scsi_Cmnd *) tmp->host_scribble;
2800 tmp->host_scribble = NULL;
2801 tmp->result = DID_ABORT << 16;
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04002802 tmp->scsi_done(tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002803 return SUCCESS;
2804 }
2805 }
2806/*
2807 * Case 5 : If we reached this point, the command was not found in any of
2808 * the queues.
2809 *
2810 * We probably reached this point because of an unlikely race condition
2811 * between the command completing successfully and the abortion code,
2812 * so we won't panic, but we will notify the user in case something really
2813 * broke.
2814 */
2815 printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n"
2816 " before abortion\n", instance->host_no);
2817 return FAILED;
2818}
2819
2820
2821/*
2822 * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd)
2823 *
2824 * Purpose : reset the SCSI bus.
2825 *
2826 * Returns : SUCCESS
2827 *
2828 * Locks: host lock taken by caller
2829 */
2830
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04002831static int NCR5380_bus_reset(Scsi_Cmnd * cmd)
2832{
2833 struct Scsi_Host *instance = cmd->device->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002834
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04002835 NCR5380_local_declare();
2836 NCR5380_setup(instance);
2837 NCR5380_print_status(instance);
2838
2839 spin_lock_irq(instance->host_lock);
2840 do_reset(instance);
2841 spin_unlock_irq(instance->host_lock);
2842
Linus Torvalds1da177e2005-04-16 15:20:36 -07002843 return SUCCESS;
2844}