blob: f8e449a98d29e03f9c03a491bbea94c7b158ceb7 [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
33 * (alan@redhat.com)
34 * 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
298 if (cmd->use_sg) {
Christoph Hellwig5d5ff442006-06-03 13:21:13 +0200299 cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 cmd->SCp.buffers_residual = cmd->use_sg - 1;
301 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+
302 cmd->SCp.buffer->offset;
303 cmd->SCp.this_residual = cmd->SCp.buffer->length;
304 } else {
305 cmd->SCp.buffer = NULL;
306 cmd->SCp.buffers_residual = 0;
307 cmd->SCp.ptr = (char *) cmd->request_buffer;
308 cmd->SCp.this_residual = cmd->request_bufflen;
309 }
310}
311
312/**
313 * NCR5380_poll_politely - wait for NCR5380 status bits
314 * @instance: controller to poll
315 * @reg: 5380 register to poll
316 * @bit: Bitmask to check
317 * @val: Value required to exit
318 *
319 * Polls the NCR5380 in a reasonably efficient manner waiting for
320 * an event to occur, after a short quick poll we begin giving the
321 * CPU back in non IRQ contexts
322 *
323 * Returns the value of the register or a negative error code.
324 */
325
326static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t)
327{
328 NCR5380_local_declare();
329 int n = 500; /* At about 8uS a cycle for the cpu access */
330 unsigned long end = jiffies + t;
331 int r;
332
333 NCR5380_setup(instance);
334
335 while( n-- > 0)
336 {
337 r = NCR5380_read(reg);
338 if((r & bit) == val)
339 return 0;
340 cpu_relax();
341 }
342
343 /* t time yet ? */
344 while(time_before(jiffies, end))
345 {
346 r = NCR5380_read(reg);
347 if((r & bit) == val)
348 return 0;
349 if(!in_interrupt())
Amol Lad730a6462007-05-23 14:41:37 -0700350 cond_resched();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 else
352 cpu_relax();
353 }
354 return -ETIMEDOUT;
355}
356
357static struct {
358 unsigned char value;
359 const char *name;
Andrew Morton702809c2007-05-23 14:41:56 -0700360} phases[] __maybe_unused = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 {PHASE_DATAOUT, "DATAOUT"},
362 {PHASE_DATAIN, "DATAIN"},
363 {PHASE_CMDOUT, "CMDOUT"},
364 {PHASE_STATIN, "STATIN"},
365 {PHASE_MSGOUT, "MSGOUT"},
366 {PHASE_MSGIN, "MSGIN"},
367 {PHASE_UNKNOWN, "UNKNOWN"}
368};
369
viro@ZenIV.linux.org.uk185a7a12005-09-07 23:18:24 +0100370#if NDEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371static struct {
372 unsigned char mask;
373 const char *name;
374} signals[] = {
375 {SR_DBP, "PARITY"},
376 {SR_RST, "RST"},
377 {SR_BSY, "BSY"},
378 {SR_REQ, "REQ"},
379 {SR_MSG, "MSG"},
380 {SR_CD, "CD"},
381 {SR_IO, "IO"},
382 {SR_SEL, "SEL"},
383 {0, NULL}
384},
385basrs[] = {
386 {BASR_ATN, "ATN"},
387 {BASR_ACK, "ACK"},
388 {0, NULL}
389},
390icrs[] = {
391 {ICR_ASSERT_RST, "ASSERT RST"},
392 {ICR_ASSERT_ACK, "ASSERT ACK"},
393 {ICR_ASSERT_BSY, "ASSERT BSY"},
394 {ICR_ASSERT_SEL, "ASSERT SEL"},
395 {ICR_ASSERT_ATN, "ASSERT ATN"},
396 {ICR_ASSERT_DATA, "ASSERT DATA"},
397 {0, NULL}
398},
399mrs[] = {
400 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"},
401 {MR_TARGET, "MODE TARGET"},
402 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"},
403 {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"},
404 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
405 {MR_DMA_MODE, "MODE DMA"},
406 {MR_ARBITRATE, "MODE ARBITRATION"},
407 {0, NULL}
408};
409
410/**
411 * NCR5380_print - print scsi bus signals
412 * @instance: adapter state to dump
413 *
414 * Print the SCSI bus signals for debugging purposes
415 *
416 * Locks: caller holds hostdata lock (not essential)
417 */
418
419static void NCR5380_print(struct Scsi_Host *instance)
420{
421 NCR5380_local_declare();
422 unsigned char status, data, basr, mr, icr, i;
423 NCR5380_setup(instance);
424
425 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
426 status = NCR5380_read(STATUS_REG);
427 mr = NCR5380_read(MODE_REG);
428 icr = NCR5380_read(INITIATOR_COMMAND_REG);
429 basr = NCR5380_read(BUS_AND_STATUS_REG);
430
431 printk("STATUS_REG: %02x ", status);
432 for (i = 0; signals[i].mask; ++i)
433 if (status & signals[i].mask)
434 printk(",%s", signals[i].name);
435 printk("\nBASR: %02x ", basr);
436 for (i = 0; basrs[i].mask; ++i)
437 if (basr & basrs[i].mask)
438 printk(",%s", basrs[i].name);
439 printk("\nICR: %02x ", icr);
440 for (i = 0; icrs[i].mask; ++i)
441 if (icr & icrs[i].mask)
442 printk(",%s", icrs[i].name);
443 printk("\nMODE: %02x ", mr);
444 for (i = 0; mrs[i].mask; ++i)
445 if (mr & mrs[i].mask)
446 printk(",%s", mrs[i].name);
447 printk("\n");
448}
449
450
451/*
452 * NCR5380_print_phase - show SCSI phase
453 * @instance: adapter to dump
454 *
455 * Print the current SCSI phase for debugging purposes
456 *
457 * Locks: none
458 */
459
460static void NCR5380_print_phase(struct Scsi_Host *instance)
461{
462 NCR5380_local_declare();
463 unsigned char status;
464 int i;
465 NCR5380_setup(instance);
466
467 status = NCR5380_read(STATUS_REG);
468 if (!(status & SR_REQ))
469 printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no);
470 else {
471 for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i);
472 printk("scsi%d : phase %s\n", instance->host_no, phases[i].name);
473 }
474}
475#endif
476
477/*
478 * These need tweaking, and would probably work best as per-device
479 * flags initialized differently for disk, tape, cd, etc devices.
480 * People with broken devices are free to experiment as to what gives
481 * the best results for them.
482 *
483 * USLEEP_SLEEP should be a minimum seek time.
484 *
485 * USLEEP_POLL should be a maximum rotational latency.
486 */
487#ifndef USLEEP_SLEEP
488/* 20 ms (reasonable hard disk speed) */
489#define USLEEP_SLEEP (20*HZ/1000)
490#endif
491/* 300 RPM (floppy speed) */
492#ifndef USLEEP_POLL
493#define USLEEP_POLL (200*HZ/1000)
494#endif
495#ifndef USLEEP_WAITLONG
496/* RvC: (reasonable time to wait on select error) */
497#define USLEEP_WAITLONG USLEEP_SLEEP
498#endif
499
500/*
501 * Function : int should_disconnect (unsigned char cmd)
502 *
Andreas Mohrd6e05ed2006-06-26 18:35:02 +0200503 * Purpose : decide whether a command would normally disconnect or
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 * not, since if it won't disconnect we should go to sleep.
505 *
506 * Input : cmd - opcode of SCSI command
507 *
508 * Returns : DISCONNECT_LONG if we should disconnect for a really long
509 * time (ie always, sleep, look for REQ active, sleep),
510 * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal
511 * time-to-data delay, DISCONNECT_NONE if this command would return
512 * immediately.
513 *
514 * Future sleep algorithms based on time to data can exploit
515 * something like this so they can differentiate between "normal"
516 * (ie, read, write, seek) and unusual commands (ie, * format).
517 *
518 * Note : We don't deal with commands that handle an immediate disconnect,
519 *
520 */
521
522static int should_disconnect(unsigned char cmd)
523{
524 switch (cmd) {
525 case READ_6:
526 case WRITE_6:
527 case SEEK_6:
528 case READ_10:
529 case WRITE_10:
530 case SEEK_10:
531 return DISCONNECT_TIME_TO_DATA;
532 case FORMAT_UNIT:
533 case SEARCH_HIGH:
534 case SEARCH_LOW:
535 case SEARCH_EQUAL:
536 return DISCONNECT_LONG;
537 default:
538 return DISCONNECT_NONE;
539 }
540}
541
542static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout)
543{
544 hostdata->time_expires = jiffies + timeout;
545 schedule_delayed_work(&hostdata->coroutine, timeout);
546}
547
548
549static int probe_irq __initdata = 0;
550
551/**
552 * probe_intr - helper for IRQ autoprobe
553 * @irq: interrupt number
554 * @dev_id: unused
555 * @regs: unused
556 *
557 * Set a flag to indicate the IRQ in question was received. This is
558 * used by the IRQ probe code.
559 */
560
David Howells7d12e782006-10-05 14:55:46 +0100561static irqreturn_t __init probe_intr(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562{
563 probe_irq = irq;
564 return IRQ_HANDLED;
565}
566
567/**
568 * NCR5380_probe_irq - find the IRQ of an NCR5380
569 * @instance: NCR5380 controller
570 * @possible: bitmask of ISA IRQ lines
571 *
572 * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ
573 * and then looking to see what interrupt actually turned up.
574 *
575 * Locks: none, irqs must be enabled on entry
576 */
577
Andrew Morton702809c2007-05-23 14:41:56 -0700578static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance,
579 int possible)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580{
581 NCR5380_local_declare();
582 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
583 unsigned long timeout;
584 int trying_irqs, i, mask;
585 NCR5380_setup(instance);
586
587 for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1)
Thomas Gleixner1d6f3592006-07-01 19:29:42 -0700588 if ((mask & possible) && (request_irq(i, &probe_intr, IRQF_DISABLED, "NCR-probe", NULL) == 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 trying_irqs |= mask;
590
591 timeout = jiffies + (250 * HZ / 1000);
592 probe_irq = SCSI_IRQ_NONE;
593
594 /*
595 * A interrupt is triggered whenever BSY = false, SEL = true
596 * and a bit set in the SELECT_ENABLE_REG is asserted on the
597 * SCSI bus.
598 *
599 * Note that the bus is only driven when the phase control signals
600 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that
601 * to zero.
602 */
603
604 NCR5380_write(TARGET_COMMAND_REG, 0);
605 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
606 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
607 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL);
608
609 while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout))
Nishanth Aravamudana9a30472005-11-07 01:01:20 -0800610 schedule_timeout_uninterruptible(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
612 NCR5380_write(SELECT_ENABLE_REG, 0);
613 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
614
615 for (i = 0, mask = 1; i < 16; ++i, mask <<= 1)
616 if (trying_irqs & mask)
617 free_irq(i, NULL);
618
619 return probe_irq;
620}
621
622/**
623 * NCR58380_print_options - show options
624 * @instance: unused for now
625 *
626 * Called by probe code indicating the NCR5380 driver options that
627 * were selected. At some point this will switch to runtime options
628 * read from the adapter in question
629 *
630 * Locks: none
631 */
632
Andrew Morton702809c2007-05-23 14:41:56 -0700633static void __init __maybe_unused
634NCR5380_print_options(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635{
636 printk(" generic options"
637#ifdef AUTOPROBE_IRQ
638 " AUTOPROBE_IRQ"
639#endif
640#ifdef AUTOSENSE
641 " AUTOSENSE"
642#endif
643#ifdef DIFFERENTIAL
644 " DIFFERENTIAL"
645#endif
646#ifdef REAL_DMA
647 " REAL DMA"
648#endif
649#ifdef REAL_DMA_POLL
650 " REAL DMA POLL"
651#endif
652#ifdef PARITY
653 " PARITY"
654#endif
655#ifdef PSEUDO_DMA
656 " PSEUDO DMA"
657#endif
658#ifdef UNSAFE
659 " UNSAFE "
660#endif
661 );
662 printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP);
663 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
664 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) {
665 printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE);
666 }
667}
668
669/**
670 * NCR5380_print_status - dump controller info
671 * @instance: controller to dump
672 *
673 * Print commands in the various queues, called from NCR5380_abort
674 * and NCR5380_debug to aid debugging.
675 *
676 * Locks: called functions disable irqs
677 */
678
679static void NCR5380_print_status(struct Scsi_Host *instance)
680{
681 NCR5380_dprint(NDEBUG_ANY, instance);
682 NCR5380_dprint_phase(NDEBUG_ANY, instance);
683}
684
685/******************************************/
686/*
687 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
688 *
689 * *buffer: I/O buffer
690 * **start: if inout == FALSE pointer into buffer where user read should start
691 * offset: current offset
692 * length: length of buffer
693 * hostno: Scsi_Host host_no
694 * inout: TRUE - user is writing; FALSE - user is reading
695 *
696 * Return the number of bytes read from or written
697 */
698
699#undef SPRINTF
700#define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0)
701static
702char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length);
703static
704char *lprint_command(unsigned char *cmd, char *pos, char *buffer, int len);
705static
706char *lprint_opcode(int opcode, char *pos, char *buffer, int length);
707
Andrew Morton702809c2007-05-23 14:41:56 -0700708static int __maybe_unused NCR5380_proc_info(struct Scsi_Host *instance,
709 char *buffer, char **start, off_t offset, int length, int inout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710{
711 char *pos = buffer;
712 struct NCR5380_hostdata *hostdata;
713 Scsi_Cmnd *ptr;
714
715 hostdata = (struct NCR5380_hostdata *) instance->hostdata;
716
717 if (inout) { /* Has data been written to the file ? */
718#ifdef DTC_PUBLIC_RELEASE
719 dtc_wmaxi = dtc_maxi = 0;
720#endif
721#ifdef PAS16_PUBLIC_RELEASE
722 pas_wmaxi = pas_maxi = 0;
723#endif
724 return (-ENOSYS); /* Currently this is a no-op */
725 }
726 SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE);
727 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400)
728 SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE);
729#ifdef DTC_PUBLIC_RELEASE
730 SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE);
731#endif
732#ifdef T128_PUBLIC_RELEASE
733 SPRINTF("T128 release %d", T128_PUBLIC_RELEASE);
734#endif
735#ifdef GENERIC_NCR5380_PUBLIC_RELEASE
736 SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE);
737#endif
738#ifdef PAS16_PUBLIC_RELEASE
739 SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE);
740#endif
741
742 SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base);
743 SPRINTF("io_port: %04x ", (int) instance->io_port);
744 if (instance->irq == SCSI_IRQ_NONE)
745 SPRINTF("IRQ: None.\n");
746 else
747 SPRINTF("IRQ: %d.\n", instance->irq);
748
749#ifdef DTC_PUBLIC_RELEASE
750 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi);
751#endif
752#ifdef PAS16_PUBLIC_RELEASE
753 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi);
754#endif
755 spin_lock_irq(instance->host_lock);
756 if (!hostdata->connected)
757 SPRINTF("scsi%d: no currently connected command\n", instance->host_no);
758 else
759 pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, pos, buffer, length);
760 SPRINTF("scsi%d: issue_queue\n", instance->host_no);
761 for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
762 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
763
764 SPRINTF("scsi%d: disconnected_queue\n", instance->host_no);
765 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
766 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
767 spin_unlock_irq(instance->host_lock);
768
769 *start = buffer;
770 if (pos - buffer < offset)
771 return 0;
772 else if (pos - buffer - offset < length)
773 return pos - buffer - offset;
774 return length;
775}
776
777static char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length)
778{
779 SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun);
780 SPRINTF(" command = ");
781 pos = lprint_command(cmd->cmnd, pos, buffer, length);
782 return (pos);
783}
784
785static char *lprint_command(unsigned char *command, char *pos, char *buffer, int length)
786{
787 int i, s;
788 pos = lprint_opcode(command[0], pos, buffer, length);
789 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
790 SPRINTF("%02x ", command[i]);
791 SPRINTF("\n");
792 return (pos);
793}
794
795static char *lprint_opcode(int opcode, char *pos, char *buffer, int length)
796{
797 SPRINTF("%2d (0x%02x)", opcode, opcode);
798 return (pos);
799}
800
801
802/**
803 * NCR5380_init - initialise an NCR5380
804 * @instance: adapter to configure
805 * @flags: control flags
806 *
807 * Initializes *instance and corresponding 5380 chip,
808 * with flags OR'd into the initial flags value.
809 *
810 * Notes : I assume that the host, hostno, and id bits have been
811 * set correctly. I don't care about the irq and other fields.
812 *
813 * Returns 0 for success
814 *
815 * Locks: interrupts must be enabled when we are called
816 */
817
818static int __devinit NCR5380_init(struct Scsi_Host *instance, int flags)
819{
820 NCR5380_local_declare();
821 int i, pass;
822 unsigned long timeout;
823 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
824
825 if(in_interrupt())
826 printk(KERN_ERR "NCR5380_init called with interrupts off!\n");
827 /*
828 * On NCR53C400 boards, NCR5380 registers are mapped 8 past
829 * the base address.
830 */
831
832#ifdef NCR53C400
833 if (flags & FLAG_NCR53C400)
834 instance->NCR5380_instance_name += NCR53C400_address_adjust;
835#endif
836
837 NCR5380_setup(instance);
838
839 hostdata->aborted = 0;
840 hostdata->id_mask = 1 << instance->this_id;
841 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
842 if (i > hostdata->id_mask)
843 hostdata->id_higher_mask |= i;
844 for (i = 0; i < 8; ++i)
845 hostdata->busy[i] = 0;
846#ifdef REAL_DMA
847 hostdata->dmalen = 0;
848#endif
849 hostdata->targets_present = 0;
850 hostdata->connected = NULL;
851 hostdata->issue_queue = NULL;
852 hostdata->disconnected_queue = NULL;
853
David Howellsc4028952006-11-22 14:57:56 +0000854 INIT_DELAYED_WORK(&hostdata->coroutine, NCR5380_main);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855
856#ifdef NCR5380_STATS
857 for (i = 0; i < 8; ++i) {
858 hostdata->time_read[i] = 0;
859 hostdata->time_write[i] = 0;
860 hostdata->bytes_read[i] = 0;
861 hostdata->bytes_write[i] = 0;
862 }
863 hostdata->timebase = 0;
864 hostdata->pendingw = 0;
865 hostdata->pendingr = 0;
866#endif
867
868 /* The CHECK code seems to break the 53C400. Will check it later maybe */
869 if (flags & FLAG_NCR53C400)
870 hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags;
871 else
872 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags;
873
874 hostdata->host = instance;
875 hostdata->time_expires = 0;
876
877#ifndef AUTOSENSE
878 if ((instance->cmd_per_lun > 1) || instance->can_queue > 1)
879 printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n"
880 " be incorrectly cleared.\n", instance->host_no);
881#endif /* def AUTOSENSE */
882
883 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
884 NCR5380_write(MODE_REG, MR_BASE);
885 NCR5380_write(TARGET_COMMAND_REG, 0);
886 NCR5380_write(SELECT_ENABLE_REG, 0);
887
888#ifdef NCR53C400
889 if (hostdata->flags & FLAG_NCR53C400) {
890 NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
891 }
892#endif
893
894 /*
895 * Detect and correct bus wedge problems.
896 *
897 * If the system crashed, it may have crashed in a state
898 * where a SCSI command was still executing, and the
899 * SCSI bus is not in a BUS FREE STATE.
900 *
901 * If this is the case, we'll try to abort the currently
902 * established nexus which we know nothing about, and that
903 * failing, do a hard reset of the SCSI bus
904 */
905
906 for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) {
907 switch (pass) {
908 case 1:
909 case 3:
910 case 5:
911 printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no);
912 timeout = jiffies + 5 * HZ;
913 NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ);
914 break;
915 case 2:
916 printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no);
917 do_abort(instance);
918 break;
919 case 4:
920 printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no);
921 do_reset(instance);
922 break;
923 case 6:
924 printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no);
925 return -ENXIO;
926 }
927 }
928 return 0;
929}
930
931/**
932 * NCR5380_exit - remove an NCR5380
933 * @instance: adapter to remove
934 */
935
936static void __devexit NCR5380_exit(struct Scsi_Host *instance)
937{
938 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
939
940 cancel_delayed_work(&hostdata->coroutine);
941 flush_scheduled_work();
942}
943
944/**
945 * NCR5380_queue_command - queue a command
946 * @cmd: SCSI command
947 * @done: completion handler
948 *
949 * cmd is added to the per instance issue_queue, with minor
950 * twiddling done to the host specific fields of cmd. If the
951 * main coroutine is not running, it is restarted.
952 *
953 * Locks: host lock taken by caller
954 */
955
956static int NCR5380_queue_command(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
957{
958 struct Scsi_Host *instance = cmd->device->host;
959 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
960 Scsi_Cmnd *tmp;
961
962#if (NDEBUG & NDEBUG_NO_WRITE)
963 switch (cmd->cmnd[0]) {
964 case WRITE_6:
965 case WRITE_10:
966 printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no);
967 cmd->result = (DID_ERROR << 16);
968 done(cmd);
969 return 0;
970 }
971#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
972
973#ifdef NCR5380_STATS
974 switch (cmd->cmnd[0]) {
975 case WRITE:
976 case WRITE_6:
977 case WRITE_10:
978 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
979 hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;
980 hostdata->pendingw++;
981 break;
982 case READ:
983 case READ_6:
984 case READ_10:
985 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
986 hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;
987 hostdata->pendingr++;
988 break;
989 }
990#endif
991
992 /*
993 * We use the host_scribble field as a pointer to the next command
994 * in a queue
995 */
996
997 cmd->host_scribble = NULL;
998 cmd->scsi_done = done;
999 cmd->result = 0;
1000
1001 /*
1002 * Insert the cmd into the issue queue. Note that REQUEST SENSE
1003 * commands are added to the head of the queue since any command will
1004 * clear the contingent allegiance condition that exists and the
1005 * sense data is only guaranteed to be valid while the condition exists.
1006 */
1007
1008 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
1009 LIST(cmd, hostdata->issue_queue);
1010 cmd->host_scribble = (unsigned char *) hostdata->issue_queue;
1011 hostdata->issue_queue = cmd;
1012 } else {
1013 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble);
1014 LIST(cmd, tmp);
1015 tmp->host_scribble = (unsigned char *) cmd;
1016 }
1017 dprintk(NDEBUG_QUEUES, ("scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"));
1018
1019 /* Run the coroutine if it isn't already running. */
1020 /* Kick off command processing */
David Howellsc4028952006-11-22 14:57:56 +00001021 schedule_delayed_work(&hostdata->coroutine, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 return 0;
1023}
1024
1025
1026/**
1027 * NCR5380_main - NCR state machines
1028 *
1029 * NCR5380_main is a coroutine that runs as long as more work can
1030 * be done on the NCR5380 host adapters in a system. Both
1031 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1032 * in case it is not running.
1033 *
1034 * Locks: called as its own thread with no locks held. Takes the
1035 * host lock and called routines may take the isa dma lock.
1036 */
1037
David Howellsc4028952006-11-22 14:57:56 +00001038static void NCR5380_main(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039{
David Howellsc4028952006-11-22 14:57:56 +00001040 struct NCR5380_hostdata *hostdata =
1041 container_of(work, struct NCR5380_hostdata, coroutine.work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 struct Scsi_Host *instance = hostdata->host;
1043 Scsi_Cmnd *tmp, *prev;
1044 int done;
1045
1046 spin_lock_irq(instance->host_lock);
1047 do {
1048 /* Lock held here */
1049 done = 1;
1050 if (!hostdata->connected && !hostdata->selecting) {
1051 dprintk(NDEBUG_MAIN, ("scsi%d : not connected\n", instance->host_no));
1052 /*
1053 * Search through the issue_queue for a command destined
1054 * for a target that's not busy.
1055 */
1056 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
1057 {
1058 if (prev != tmp)
1059 dprintk(NDEBUG_LISTS, ("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun));
1060 /* When we find one, remove it from the issue queue. */
1061 if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) {
1062 if (prev) {
1063 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
1064 prev->host_scribble = tmp->host_scribble;
1065 } else {
1066 REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble);
1067 hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble;
1068 }
1069 tmp->host_scribble = NULL;
1070
1071 /*
1072 * Attempt to establish an I_T_L nexus here.
1073 * On success, instance->hostdata->connected is set.
1074 * On failure, we must add the command back to the
1075 * issue queue so we can keep trying.
1076 */
1077 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main() : command for target %d lun %d removed from issue_queue\n", instance->host_no, tmp->target, tmp->lun));
1078
1079 /*
1080 * A successful selection is defined as one that
1081 * leaves us with the command connected and
1082 * in hostdata->connected, OR has terminated the
1083 * command.
1084 *
1085 * With successful commands, we fall through
1086 * and see if we can do an information transfer,
1087 * with failures we will restart.
1088 */
1089 hostdata->selecting = NULL;
1090 /* RvC: have to preset this to indicate a new command is being performed */
1091
1092 if (!NCR5380_select(instance, tmp,
1093 /*
1094 * REQUEST SENSE commands are issued without tagged
1095 * queueing, even on SCSI-II devices because the
1096 * contingent allegiance condition exists for the
1097 * entire unit.
1098 */
1099 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
1100 break;
1101 } else {
1102 LIST(tmp, hostdata->issue_queue);
1103 tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1104 hostdata->issue_queue = tmp;
1105 done = 0;
1106 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no));
1107 }
1108 /* lock held here still */
1109 } /* if target/lun is not busy */
1110 } /* for */
1111 /* exited locked */
1112 } /* if (!hostdata->connected) */
1113 if (hostdata->selecting) {
1114 tmp = (Scsi_Cmnd *) hostdata->selecting;
1115 /* Selection will drop and retake the lock */
1116 if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
1117 /* Ok ?? */
1118 } else {
1119 /* RvC: device failed, so we wait a long time
1120 this is needed for Mustek scanners, that
1121 do not respond to commands immediately
1122 after a scan */
1123 printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id);
1124 LIST(tmp, hostdata->issue_queue);
1125 tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1126 hostdata->issue_queue = tmp;
1127 NCR5380_set_timer(hostdata, USLEEP_WAITLONG);
1128 }
1129 } /* if hostdata->selecting */
1130 if (hostdata->connected
1131#ifdef REAL_DMA
1132 && !hostdata->dmalen
1133#endif
1134 && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies))
1135 ) {
1136 dprintk(NDEBUG_MAIN, ("scsi%d : main() : performing information transfer\n", instance->host_no));
1137 NCR5380_information_transfer(instance);
1138 dprintk(NDEBUG_MAIN, ("scsi%d : main() : done set false\n", instance->host_no));
1139 done = 0;
1140 } else
1141 break;
1142 } while (!done);
1143
1144 spin_unlock_irq(instance->host_lock);
1145}
1146
1147#ifndef DONT_USE_INTR
1148
1149/**
1150 * NCR5380_intr - generic NCR5380 irq handler
1151 * @irq: interrupt number
1152 * @dev_id: device info
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 *
1154 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1155 * from the disconnected queue, and restarting NCR5380_main()
1156 * as required.
1157 *
1158 * Locks: takes the needed instance locks
1159 */
1160
David Howells7d12e782006-10-05 14:55:46 +01001161static irqreturn_t NCR5380_intr(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162{
1163 NCR5380_local_declare();
1164 struct Scsi_Host *instance = (struct Scsi_Host *)dev_id;
1165 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1166 int done;
1167 unsigned char basr;
1168 unsigned long flags;
1169
1170 dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n", irq));
1171
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
1545 if (cmd->SCp.ptr != (char *)cmd->sense_buffer) {
1546 initialize_SCp(cmd);
1547 }
1548
1549 return 0;
1550
1551 /* Selection failed */
1552failed:
1553 return -1;
1554
1555}
1556
1557/*
1558 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1559 * unsigned char *phase, int *count, unsigned char **data)
1560 *
1561 * Purpose : transfers data in given phase using polled I/O
1562 *
1563 * Inputs : instance - instance of driver, *phase - pointer to
1564 * what phase is expected, *count - pointer to number of
1565 * bytes to transfer, **data - pointer to data pointer.
1566 *
1567 * Returns : -1 when different phase is entered without transferring
1568 * maximum number of bytes, 0 if all bytes or transfered or exit
1569 * is in same phase.
1570 *
1571 * Also, *phase, *count, *data are modified in place.
1572 *
1573 * XXX Note : handling for bus free may be useful.
1574 */
1575
1576/*
1577 * Note : this code is not as quick as it could be, however it
1578 * IS 100% reliable, and for the actual data transfer where speed
1579 * counts, we will always do a pseudo DMA or DMA transfer.
1580 */
1581
1582static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1583 NCR5380_local_declare();
1584 unsigned char p = *phase, tmp;
1585 int c = *count;
1586 unsigned char *d = *data;
1587 /*
1588 * RvC: some administrative data to process polling time
1589 */
1590 int break_allowed = 0;
1591 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1592 NCR5380_setup(instance);
1593
1594 if (!(p & SR_IO))
1595 dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c));
1596 else
1597 dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c));
1598
1599 /*
1600 * The NCR5380 chip will only drive the SCSI bus when the
1601 * phase specified in the appropriate bits of the TARGET COMMAND
1602 * REGISTER match the STATUS REGISTER
1603 */
1604
1605 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1606
1607 /* RvC: don't know if this is necessary, but other SCSI I/O is short
1608 * so breaks are not necessary there
1609 */
1610 if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) {
1611 break_allowed = 1;
1612 }
1613 do {
1614 /*
1615 * Wait for assertion of REQ, after which the phase bits will be
1616 * valid
1617 */
1618
1619 /* RvC: we simply poll once, after that we stop temporarily
1620 * and let the device buffer fill up
1621 * if breaking is not allowed, we keep polling as long as needed
1622 */
1623
1624 /* FIXME */
1625 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed);
1626 if (!(tmp & SR_REQ)) {
1627 /* timeout condition */
1628 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
1629 break;
1630 }
1631
1632 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no));
1633
1634 /* Check for phase mismatch */
1635 if ((tmp & PHASE_MASK) != p) {
1636 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no));
1637 NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance);
1638 break;
1639 }
1640 /* Do actual transfer from SCSI bus to / from memory */
1641 if (!(p & SR_IO))
1642 NCR5380_write(OUTPUT_DATA_REG, *d);
1643 else
1644 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1645
1646 ++d;
1647
1648 /*
1649 * The SCSI standard suggests that in MSGOUT phase, the initiator
1650 * should drop ATN on the last byte of the message phase
1651 * after REQ has been asserted for the handshake but before
1652 * the initiator raises ACK.
1653 */
1654
1655 if (!(p & SR_IO)) {
1656 if (!((p & SR_MSG) && c > 1)) {
1657 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1658 NCR5380_dprint(NDEBUG_PIO, instance);
1659 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1660 } else {
1661 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1662 NCR5380_dprint(NDEBUG_PIO, instance);
1663 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1664 }
1665 } else {
1666 NCR5380_dprint(NDEBUG_PIO, instance);
1667 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1668 }
1669
1670 /* FIXME - if this fails bus reset ?? */
1671 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ);
1672 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no));
1673
1674/*
1675 * We have several special cases to consider during REQ/ACK handshaking :
1676 * 1. We were in MSGOUT phase, and we are on the last byte of the
1677 * message. ATN must be dropped as ACK is dropped.
1678 *
1679 * 2. We are in a MSGIN phase, and we are on the last byte of the
1680 * message. We must exit with ACK asserted, so that the calling
1681 * code may raise ATN before dropping ACK to reject the message.
1682 *
1683 * 3. ACK and ATN are clear and the target may proceed as normal.
1684 */
1685 if (!(p == PHASE_MSGIN && c == 1)) {
1686 if (p == PHASE_MSGOUT && c > 1)
1687 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1688 else
1689 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1690 }
1691 } while (--c);
1692
1693 dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c));
1694
1695 *count = c;
1696 *data = d;
1697 tmp = NCR5380_read(STATUS_REG);
1698 if (tmp & SR_REQ)
1699 *phase = tmp & PHASE_MASK;
1700 else
1701 *phase = PHASE_UNKNOWN;
1702
1703 if (!c || (*phase == p))
1704 return 0;
1705 else
1706 return -1;
1707}
1708
1709/**
1710 * do_reset - issue a reset command
1711 * @host: adapter to reset
1712 *
1713 * Issue a reset sequence to the NCR5380 and try and get the bus
1714 * back into sane shape.
1715 *
1716 * Locks: caller holds queue lock
1717 */
1718
1719static void do_reset(struct Scsi_Host *host) {
1720 NCR5380_local_declare();
1721 NCR5380_setup(host);
1722
1723 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
1724 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
1725 udelay(25);
1726 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1727}
1728
1729/*
1730 * Function : do_abort (Scsi_Host *host)
1731 *
1732 * Purpose : abort the currently established nexus. Should only be
1733 * called from a routine which can drop into a
1734 *
1735 * Returns : 0 on success, -1 on failure.
1736 *
1737 * Locks: queue lock held by caller
1738 * FIXME: sort this out and get new_eh running
1739 */
1740
1741static int do_abort(struct Scsi_Host *host) {
1742 NCR5380_local_declare();
1743 unsigned char *msgptr, phase, tmp;
1744 int len;
1745 int rc;
1746 NCR5380_setup(host);
1747
1748
1749 /* Request message out phase */
1750 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1751
1752 /*
1753 * Wait for the target to indicate a valid phase by asserting
1754 * REQ. Once this happens, we'll have either a MSGOUT phase
1755 * and can immediately send the ABORT message, or we'll have some
1756 * other phase and will have to source/sink data.
1757 *
1758 * We really don't care what value was on the bus or what value
1759 * the target sees, so we just handshake.
1760 */
1761
1762 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ);
1763
1764 if(rc < 0)
1765 return -1;
1766
1767 tmp = (unsigned char)rc;
1768
1769 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1770
1771 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1772 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1773 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ);
1774 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1775 if(rc == -1)
1776 return -1;
1777 }
1778 tmp = ABORT;
1779 msgptr = &tmp;
1780 len = 1;
1781 phase = PHASE_MSGOUT;
1782 NCR5380_transfer_pio(host, &phase, &len, &msgptr);
1783
1784 /*
1785 * If we got here, and the command completed successfully,
1786 * we're about to go into bus free state.
1787 */
1788
1789 return len ? -1 : 0;
1790}
1791
1792#if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL)
1793/*
1794 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1795 * unsigned char *phase, int *count, unsigned char **data)
1796 *
1797 * Purpose : transfers data in given phase using either real
1798 * or pseudo DMA.
1799 *
1800 * Inputs : instance - instance of driver, *phase - pointer to
1801 * what phase is expected, *count - pointer to number of
1802 * bytes to transfer, **data - pointer to data pointer.
1803 *
1804 * Returns : -1 when different phase is entered without transferring
1805 * maximum number of bytes, 0 if all bytes or transfered or exit
1806 * is in same phase.
1807 *
1808 * Also, *phase, *count, *data are modified in place.
1809 *
1810 * Locks: io_request lock held by caller
1811 */
1812
1813
1814static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1815 NCR5380_local_declare();
1816 register int c = *count;
1817 register unsigned char p = *phase;
1818 register unsigned char *d = *data;
1819 unsigned char tmp;
1820 int foo;
1821#if defined(REAL_DMA_POLL)
1822 int cnt, toPIO;
1823 unsigned char saved_data = 0, overrun = 0, residue;
1824#endif
1825
1826 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1827
1828 NCR5380_setup(instance);
1829
1830 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1831 *phase = tmp;
1832 return -1;
1833 }
1834#if defined(REAL_DMA) || defined(REAL_DMA_POLL)
1835#ifdef READ_OVERRUNS
1836 if (p & SR_IO) {
1837 c -= 2;
1838 }
1839#endif
1840 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));
1841 hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c);
1842#endif
1843
1844 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1845
1846#ifdef REAL_DMA
1847 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
1848#elif defined(REAL_DMA_POLL)
1849 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
1850#else
1851 /*
1852 * Note : on my sample board, watch-dog timeouts occurred when interrupts
1853 * were not disabled for the duration of a single DMA transfer, from
1854 * before the setting of DMA mode to after transfer of the last byte.
1855 */
1856
1857#if defined(PSEUDO_DMA) && defined(UNSAFE)
1858 spin_unlock_irq(instance->host_lock);
1859#endif
1860 /* KLL May need eop and parity in 53c400 */
1861 if (hostdata->flags & FLAG_NCR53C400)
1862 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);
1863 else
1864 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
1865#endif /* def REAL_DMA */
1866
1867 dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG)));
1868
1869 /*
1870 * On the PAS16 at least I/O recovery delays are not needed here.
1871 * Everyone else seems to want them.
1872 */
1873
1874 if (p & SR_IO) {
1875 io_recovery_delay(1);
1876 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1877 } else {
1878 io_recovery_delay(1);
1879 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1880 io_recovery_delay(1);
1881 NCR5380_write(START_DMA_SEND_REG, 0);
1882 io_recovery_delay(1);
1883 }
1884
1885#if defined(REAL_DMA_POLL)
1886 do {
1887 tmp = NCR5380_read(BUS_AND_STATUS_REG);
1888 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER)));
1889
1890/*
1891 At this point, either we've completed DMA, or we have a phase mismatch,
1892 or we've unexpectedly lost BUSY (which is a real error).
1893
1894 For write DMAs, we want to wait until the last byte has been
1895 transferred out over the bus before we turn off DMA mode. Alas, there
1896 seems to be no terribly good way of doing this on a 5380 under all
1897 conditions. For non-scatter-gather operations, we can wait until REQ
1898 and ACK both go false, or until a phase mismatch occurs. Gather-writes
1899 are nastier, since the device will be expecting more data than we
1900 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
1901 could test LAST BIT SENT to assure transfer (I imagine this is precisely
1902 why this signal was added to the newer chips) but on the older 538[01]
1903 this signal does not exist. The workaround for this lack is a watchdog;
1904 we bail out of the wait-loop after a modest amount of wait-time if
1905 the usual exit conditions are not met. Not a terribly clean or
1906 correct solution :-%
1907
1908 Reads are equally tricky due to a nasty characteristic of the NCR5380.
1909 If the chip is in DMA mode for an READ, it will respond to a target's
1910 REQ by latching the SCSI data into the INPUT DATA register and asserting
1911 ACK, even if it has _already_ been notified by the DMA controller that
1912 the current DMA transfer has completed! If the NCR5380 is then taken
1913 out of DMA mode, this already-acknowledged byte is lost.
1914
1915 This is not a problem for "one DMA transfer per command" reads, because
1916 the situation will never arise... either all of the data is DMA'ed
1917 properly, or the target switches to MESSAGE IN phase to signal a
1918 disconnection (either operation bringing the DMA to a clean halt).
1919 However, in order to handle scatter-reads, we must work around the
1920 problem. The chosen fix is to DMA N-2 bytes, then check for the
1921 condition before taking the NCR5380 out of DMA mode. One or two extra
1922 bytes are transferred via PIO as necessary to fill out the original
1923 request.
1924 */
1925
1926 if (p & SR_IO) {
1927#ifdef READ_OVERRUNS
1928 udelay(10);
1929 if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) {
1930 saved_data = NCR5380_read(INPUT_DATA_REGISTER);
1931 overrun = 1;
1932 }
1933#endif
1934 } else {
1935 int limit = 100;
1936 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) {
1937 if (!(tmp & BASR_PHASE_MATCH))
1938 break;
1939 if (--limit < 0)
1940 break;
1941 }
1942 }
1943
1944 dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG)));
1945
1946 NCR5380_write(MODE_REG, MR_BASE);
1947 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1948
1949 residue = NCR5380_dma_residual(instance);
1950 c -= residue;
1951 *count -= c;
1952 *data += c;
1953 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
1954
1955#ifdef READ_OVERRUNS
1956 if (*phase == p && (p & SR_IO) && residue == 0) {
1957 if (overrun) {
1958 dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n"));
1959 **data = saved_data;
1960 *data += 1;
1961 *count -= 1;
1962 cnt = toPIO = 1;
1963 } else {
1964 printk("No overrun??\n");
1965 cnt = toPIO = 2;
1966 }
1967 dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data));
1968 NCR5380_transfer_pio(instance, phase, &cnt, data);
1969 *count -= toPIO - cnt;
1970 }
1971#endif
1972
1973 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)));
1974 return 0;
1975
1976#elif defined(REAL_DMA)
1977 return 0;
1978#else /* defined(REAL_DMA_POLL) */
1979 if (p & SR_IO) {
1980#ifdef DMA_WORKS_RIGHT
1981 foo = NCR5380_pread(instance, d, c);
1982#else
1983 int diff = 1;
1984 if (hostdata->flags & FLAG_NCR53C400) {
1985 diff = 0;
1986 }
1987 if (!(foo = NCR5380_pread(instance, d, c - diff))) {
1988 /*
1989 * We can't disable DMA mode after successfully transferring
1990 * what we plan to be the last byte, since that would open up
1991 * a race condition where if the target asserted REQ before
1992 * we got the DMA mode reset, the NCR5380 would have latched
1993 * an additional byte into the INPUT DATA register and we'd
1994 * have dropped it.
1995 *
1996 * The workaround was to transfer one fewer bytes than we
1997 * intended to with the pseudo-DMA read function, wait for
1998 * the chip to latch the last byte, read it, and then disable
1999 * pseudo-DMA mode.
2000 *
2001 * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
2002 * REQ is deasserted when ACK is asserted, and not reasserted
2003 * until ACK goes false. Since the NCR5380 won't lower ACK
2004 * until DACK is asserted, which won't happen unless we twiddle
2005 * the DMA port or we take the NCR5380 out of DMA mode, we
2006 * can guarantee that we won't handshake another extra
2007 * byte.
2008 */
2009
2010 if (!(hostdata->flags & FLAG_NCR53C400)) {
2011 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ));
2012 /* Wait for clean handshake */
2013 while (NCR5380_read(STATUS_REG) & SR_REQ);
2014 d[c - 1] = NCR5380_read(INPUT_DATA_REG);
2015 }
2016 }
2017#endif
2018 } else {
2019#ifdef DMA_WORKS_RIGHT
2020 foo = NCR5380_pwrite(instance, d, c);
2021#else
2022 int timeout;
2023 dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c));
2024 if (!(foo = NCR5380_pwrite(instance, d, c))) {
2025 /*
2026 * Wait for the last byte to be sent. If REQ is being asserted for
2027 * the byte we're interested, we'll ACK it and it will go false.
2028 */
2029 if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) {
2030 timeout = 20000;
2031 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH));
2032
2033 if (!timeout)
2034 dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no));
2035
2036 if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) {
2037 hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT;
2038 if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) {
2039 hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT;
2040 dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no));
2041 }
2042 }
2043 } else {
2044 dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n"));
2045 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT));
2046 dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n"));
2047 }
2048 }
2049#endif
2050 }
2051 NCR5380_write(MODE_REG, MR_BASE);
2052 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2053
2054 if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) {
2055 dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n"));
2056 if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) {
2057 dprintk(NDEBUG_C400_PWRITE, ("53C400w: got it, reading reset interrupt reg\n"));
2058 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
2059 } else {
2060 printk("53C400w: IRQ NOT THERE!\n");
2061 }
2062 }
2063 *data = d + c;
2064 *count = 0;
2065 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
2066#if defined(PSEUDO_DMA) && defined(UNSAFE)
2067 spin_lock_irq(instance->host_lock);
2068#endif /* defined(REAL_DMA_POLL) */
2069 return foo;
2070#endif /* def REAL_DMA */
2071}
2072#endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */
2073
2074/*
2075 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
2076 *
2077 * Purpose : run through the various SCSI phases and do as the target
2078 * directs us to. Operates on the currently connected command,
2079 * instance->connected.
2080 *
2081 * Inputs : instance, instance for which we are doing commands
2082 *
2083 * Side effects : SCSI things happen, the disconnected queue will be
2084 * modified if a command disconnects, *instance->connected will
2085 * change.
2086 *
2087 * XXX Note : we need to watch for bus free or a reset condition here
2088 * to recover from an unexpected bus free condition.
2089 *
2090 * Locks: io_request_lock held by caller in IRQ mode
2091 */
2092
2093static void NCR5380_information_transfer(struct Scsi_Host *instance) {
2094 NCR5380_local_declare();
2095 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata;
2096 unsigned char msgout = NOP;
2097 int sink = 0;
2098 int len;
2099#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2100 int transfersize;
2101#endif
2102 unsigned char *data;
2103 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
2104 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
2105 /* RvC: we need to set the end of the polling time */
2106 unsigned long poll_time = jiffies + USLEEP_POLL;
2107
2108 NCR5380_setup(instance);
2109
2110 while (1) {
2111 tmp = NCR5380_read(STATUS_REG);
2112 /* We only have a valid SCSI phase when REQ is asserted */
2113 if (tmp & SR_REQ) {
2114 phase = (tmp & PHASE_MASK);
2115 if (phase != old_phase) {
2116 old_phase = phase;
2117 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance);
2118 }
2119 if (sink && (phase != PHASE_MSGOUT)) {
2120 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2121
2122 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
2123 while (NCR5380_read(STATUS_REG) & SR_REQ);
2124 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2125 sink = 0;
2126 continue;
2127 }
2128 switch (phase) {
2129 case PHASE_DATAIN:
2130 case PHASE_DATAOUT:
2131#if (NDEBUG & NDEBUG_NO_DATAOUT)
2132 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no);
2133 sink = 1;
2134 do_abort(instance);
2135 cmd->result = DID_ERROR << 16;
2136 cmd->done(cmd);
2137 return;
2138#endif
2139 /*
2140 * If there is no room left in the current buffer in the
2141 * scatter-gather list, move onto the next one.
2142 */
2143
2144 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2145 ++cmd->SCp.buffer;
2146 --cmd->SCp.buffers_residual;
2147 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2148 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+
2149 cmd->SCp.buffer->offset;
2150 dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual));
2151 }
2152 /*
2153 * The preferred transfer method is going to be
2154 * PSEUDO-DMA for systems that are strictly PIO,
2155 * since we can let the hardware do the handshaking.
2156 *
2157 * For this to work, we need to know the transfersize
2158 * ahead of time, since the pseudo-DMA code will sit
2159 * in an unconditional loop.
2160 */
2161
2162#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2163 /* KLL
2164 * PSEUDO_DMA is defined here. If this is the g_NCR5380
2165 * driver then it will always be defined, so the
2166 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
2167 * NCR5380 case. I think this is a fairly clean solution.
2168 * We supplement these 2 if's with the flag.
2169 */
2170#ifdef NCR5380_dma_xfer_len
2171 if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) {
2172#else
2173 transfersize = cmd->transfersize;
2174
2175#ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */
2176 if (transfersize > 512)
2177 transfersize = 512;
2178#endif /* LIMIT_TRANSFERSIZE */
2179
2180 if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) {
2181 /* Limit transfers to 32K, for xx400 & xx406
2182 * pseudoDMA that transfers in 128 bytes blocks. */
2183 if (transfersize > 32 * 1024)
2184 transfersize = 32 * 1024;
2185#endif
2186 len = transfersize;
2187 if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) {
2188 /*
2189 * If the watchdog timer fires, all future accesses to this
2190 * device will use the polled-IO.
2191 */
Jeff Garzik017560f2005-10-24 18:04:36 -04002192 scmd_printk(KERN_INFO, cmd,
2193 "switching to slow handshake\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002194 cmd->device->borken = 1;
2195 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2196 sink = 1;
2197 do_abort(instance);
2198 cmd->result = DID_ERROR << 16;
2199 cmd->done(cmd);
2200 /* XXX - need to source or sink data here, as appropriate */
2201 } else
2202 cmd->SCp.this_residual -= transfersize - len;
2203 } else
2204#endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */
2205 NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **)
2206 &cmd->SCp.ptr);
2207 break;
2208 case PHASE_MSGIN:
2209 len = 1;
2210 data = &tmp;
2211 NCR5380_transfer_pio(instance, &phase, &len, &data);
2212 cmd->SCp.Message = tmp;
2213
2214 switch (tmp) {
2215 /*
2216 * Linking lets us reduce the time required to get the
2217 * next command out to the device, hopefully this will
2218 * mean we don't waste another revolution due to the delays
2219 * required by ARBITRATION and another SELECTION.
2220 *
2221 * In the current implementation proposal, low level drivers
2222 * merely have to start the next command, pointed to by
2223 * next_link, done() is called as with unlinked commands.
2224 */
2225#ifdef LINKED
2226 case LINKED_CMD_COMPLETE:
2227 case LINKED_FLG_CMD_COMPLETE:
2228 /* Accept message by clearing ACK */
2229 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2230 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun));
2231 /*
2232 * Sanity check : A linked command should only terminate with
2233 * one of these messages if there are more linked commands
2234 * available.
2235 */
2236 if (!cmd->next_link) {
2237 printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun);
2238 sink = 1;
2239 do_abort(instance);
2240 return;
2241 }
2242 initialize_SCp(cmd->next_link);
2243 /* The next command is still part of this process */
2244 cmd->next_link->tag = cmd->tag;
2245 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2246 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun));
2247 collect_stats(hostdata, cmd);
2248 cmd->scsi_done(cmd);
2249 cmd = hostdata->connected;
2250 break;
2251#endif /* def LINKED */
2252 case ABORT:
2253 case COMMAND_COMPLETE:
2254 /* Accept message by clearing ACK */
2255 sink = 1;
2256 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2257 hostdata->connected = NULL;
2258 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun));
2259 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2260
2261 /*
2262 * I'm not sure what the correct thing to do here is :
2263 *
2264 * If the command that just executed is NOT a request
2265 * sense, the obvious thing to do is to set the result
2266 * code to the values of the stored parameters.
2267 *
2268 * If it was a REQUEST SENSE command, we need some way
2269 * to differentiate between the failure code of the original
2270 * and the failure code of the REQUEST sense - the obvious
2271 * case is success, where we fall through and leave the result
2272 * code unchanged.
2273 *
2274 * The non-obvious place is where the REQUEST SENSE failed
2275 */
2276
2277 if (cmd->cmnd[0] != REQUEST_SENSE)
2278 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2279 else if (status_byte(cmd->SCp.Status) != GOOD)
2280 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2281
2282#ifdef AUTOSENSE
2283 if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2284 dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no));
2285 cmd->cmnd[0] = REQUEST_SENSE;
2286 cmd->cmnd[1] &= 0xe0;
2287 cmd->cmnd[2] = 0;
2288 cmd->cmnd[3] = 0;
2289 cmd->cmnd[4] = sizeof(cmd->sense_buffer);
2290 cmd->cmnd[5] = 0;
2291
2292 cmd->SCp.buffer = NULL;
2293 cmd->SCp.buffers_residual = 0;
2294 cmd->SCp.ptr = (char *) cmd->sense_buffer;
2295 cmd->SCp.this_residual = sizeof(cmd->sense_buffer);
2296
2297 LIST(cmd, hostdata->issue_queue);
2298 cmd->host_scribble = (unsigned char *)
2299 hostdata->issue_queue;
2300 hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2301 dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no));
2302 } else
2303#endif /* def AUTOSENSE */
2304 {
2305 collect_stats(hostdata, cmd);
2306 cmd->scsi_done(cmd);
2307 }
2308
2309 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2310 /*
2311 * Restore phase bits to 0 so an interrupted selection,
2312 * arbitration can resume.
2313 */
2314 NCR5380_write(TARGET_COMMAND_REG, 0);
2315
2316 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2317 barrier();
2318 return;
2319 case MESSAGE_REJECT:
2320 /* Accept message by clearing ACK */
2321 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2322 switch (hostdata->last_message) {
2323 case HEAD_OF_QUEUE_TAG:
2324 case ORDERED_QUEUE_TAG:
2325 case SIMPLE_QUEUE_TAG:
2326 cmd->device->simple_tags = 0;
2327 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2328 break;
2329 default:
2330 break;
2331 }
2332 case DISCONNECT:{
2333 /* Accept message by clearing ACK */
2334 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2335 cmd->device->disconnect = 1;
2336 LIST(cmd, hostdata->disconnected_queue);
2337 cmd->host_scribble = (unsigned char *)
2338 hostdata->disconnected_queue;
2339 hostdata->connected = NULL;
2340 hostdata->disconnected_queue = cmd;
2341 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));
2342 /*
2343 * Restore phase bits to 0 so an interrupted selection,
2344 * arbitration can resume.
2345 */
2346 NCR5380_write(TARGET_COMMAND_REG, 0);
2347
2348 /* Enable reselect interrupts */
2349 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2350 /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/
2351 /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */
2352 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2353 barrier();
2354 return;
2355 }
2356 /*
2357 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2358 * operation, in violation of the SCSI spec so we can safely
2359 * ignore SAVE/RESTORE pointers calls.
2360 *
2361 * Unfortunately, some disks violate the SCSI spec and
2362 * don't issue the required SAVE_POINTERS message before
2363 * disconnecting, and we have to break spec to remain
2364 * compatible.
2365 */
2366 case SAVE_POINTERS:
2367 case RESTORE_POINTERS:
2368 /* Accept message by clearing ACK */
2369 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2370 break;
2371 case EXTENDED_MESSAGE:
2372/*
2373 * Extended messages are sent in the following format :
2374 * Byte
2375 * 0 EXTENDED_MESSAGE == 1
2376 * 1 length (includes one byte for code, doesn't
2377 * include first two bytes)
2378 * 2 code
2379 * 3..length+1 arguments
2380 *
2381 * Start the extended message buffer with the EXTENDED_MESSAGE
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002382 * byte, since spi_print_msg() wants the whole thing.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002383 */
2384 extended_msg[0] = EXTENDED_MESSAGE;
2385 /* Accept first byte by clearing ACK */
2386 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2387 dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no));
2388
2389 len = 2;
2390 data = extended_msg + 1;
2391 phase = PHASE_MSGIN;
2392 NCR5380_transfer_pio(instance, &phase, &len, &data);
2393
2394 dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2]));
2395
2396 if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) {
2397 /* Accept third byte by clearing ACK */
2398 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2399 len = extended_msg[1] - 1;
2400 data = extended_msg + 3;
2401 phase = PHASE_MSGIN;
2402
2403 NCR5380_transfer_pio(instance, &phase, &len, &data);
2404 dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len));
2405
2406 switch (extended_msg[2]) {
2407 case EXTENDED_SDTR:
2408 case EXTENDED_WDTR:
2409 case EXTENDED_MODIFY_DATA_POINTER:
2410 case EXTENDED_EXTENDED_IDENTIFY:
2411 tmp = 0;
2412 }
2413 } else if (len) {
2414 printk("scsi%d: error receiving extended message\n", instance->host_no);
2415 tmp = 0;
2416 } else {
2417 printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]);
2418 tmp = 0;
2419 }
2420 /* Fall through to reject message */
2421
2422 /*
2423 * If we get something weird that we aren't expecting,
2424 * reject it.
2425 */
2426 default:
2427 if (!tmp) {
2428 printk("scsi%d: rejecting message ", instance->host_no);
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002429 spi_print_msg(extended_msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002430 printk("\n");
2431 } else if (tmp != EXTENDED_MESSAGE)
Jeff Garzik017560f2005-10-24 18:04:36 -04002432 scmd_printk(KERN_INFO, cmd,
2433 "rejecting unknown message %02x\n",tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002434 else
Jeff Garzik017560f2005-10-24 18:04:36 -04002435 scmd_printk(KERN_INFO, cmd,
2436 "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002437
2438 msgout = MESSAGE_REJECT;
2439 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2440 break;
2441 } /* switch (tmp) */
2442 break;
2443 case PHASE_MSGOUT:
2444 len = 1;
2445 data = &msgout;
2446 hostdata->last_message = msgout;
2447 NCR5380_transfer_pio(instance, &phase, &len, &data);
2448 if (msgout == ABORT) {
2449 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2450 hostdata->connected = NULL;
2451 cmd->result = DID_ERROR << 16;
2452 collect_stats(hostdata, cmd);
2453 cmd->scsi_done(cmd);
2454 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2455 return;
2456 }
2457 msgout = NOP;
2458 break;
2459 case PHASE_CMDOUT:
2460 len = cmd->cmd_len;
2461 data = cmd->cmnd;
2462 /*
2463 * XXX for performance reasons, on machines with a
2464 * PSEUDO-DMA architecture we should probably
2465 * use the dma transfer function.
2466 */
2467 NCR5380_transfer_pio(instance, &phase, &len, &data);
2468 if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) {
2469 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
2470 dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
2471 return;
2472 }
2473 break;
2474 case PHASE_STATIN:
2475 len = 1;
2476 data = &tmp;
2477 NCR5380_transfer_pio(instance, &phase, &len, &data);
2478 cmd->SCp.Status = tmp;
2479 break;
2480 default:
2481 printk("scsi%d : unknown phase\n", instance->host_no);
2482 NCR5380_dprint(NDEBUG_ALL, instance);
2483 } /* switch(phase) */
2484 } /* if (tmp * SR_REQ) */
2485 else {
2486 /* RvC: go to sleep if polling time expired
2487 */
2488 if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) {
2489 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
2490 dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
2491 return;
2492 }
2493 }
2494 } /* while (1) */
2495}
2496
2497/*
2498 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2499 *
2500 * Purpose : does reselection, initializing the instance->connected
2501 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2502 * nexus has been reestablished,
2503 *
2504 * Inputs : instance - this instance of the NCR5380.
2505 *
2506 * Locks: io_request_lock held by caller if IRQ driven
2507 */
2508
2509static void NCR5380_reselect(struct Scsi_Host *instance) {
2510 NCR5380_local_declare();
2511 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
2512 instance->hostdata;
2513 unsigned char target_mask;
2514 unsigned char lun, phase;
2515 int len;
2516 unsigned char msg[3];
2517 unsigned char *data;
2518 Scsi_Cmnd *tmp = NULL, *prev;
2519 int abort = 0;
2520 NCR5380_setup(instance);
2521
2522 /*
2523 * Disable arbitration, etc. since the host adapter obviously
2524 * lost, and tell an interrupted NCR5380_select() to restart.
2525 */
2526
2527 NCR5380_write(MODE_REG, MR_BASE);
2528 hostdata->restart_select = 1;
2529
2530 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2531 dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no));
2532
2533 /*
2534 * At this point, we have detected that our SCSI ID is on the bus,
2535 * SEL is true and BSY was false for at least one bus settle delay
2536 * (400 ns).
2537 *
2538 * We must assert BSY ourselves, until the target drops the SEL
2539 * signal.
2540 */
2541
2542 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2543
2544 /* FIXME: timeout too long, must fail to workqueue */
2545 if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0)
2546 abort = 1;
2547
2548 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2549
2550 /*
2551 * Wait for target to go into MSGIN.
2552 * FIXME: timeout needed and fail to work queeu
2553 */
2554
2555 if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ))
2556 abort = 1;
2557
2558 len = 1;
2559 data = msg;
2560 phase = PHASE_MSGIN;
2561 NCR5380_transfer_pio(instance, &phase, &len, &data);
2562
2563 if (!(msg[0] & 0x80)) {
2564 printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no);
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002565 spi_print_msg(msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002566 abort = 1;
2567 } else {
2568 /* Accept message by clearing ACK */
2569 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2570 lun = (msg[0] & 0x07);
2571
2572 /*
2573 * We need to add code for SCSI-II to track which devices have
2574 * I_T_L_Q nexuses established, and which have simple I_T_L
2575 * nexuses so we can chose to do additional data transfer.
2576 */
2577
2578 /*
2579 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2580 * just reestablished, and remove it from the disconnected queue.
2581 */
2582
2583
2584 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
2585 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2586 ) {
2587 if (prev) {
2588 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
2589 prev->host_scribble = tmp->host_scribble;
2590 } else {
2591 REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble);
2592 hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble;
2593 }
2594 tmp->host_scribble = NULL;
2595 break;
2596 }
2597 if (!tmp) {
2598 printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun);
2599 /*
2600 * Since we have an established nexus that we can't do anything with,
2601 * we must abort it.
2602 */
2603 abort = 1;
2604 }
2605 }
2606
2607 if (abort) {
2608 do_abort(instance);
2609 } else {
2610 hostdata->connected = tmp;
2611 dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag));
2612 }
2613}
2614
2615/*
2616 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
2617 *
2618 * Purpose : called by interrupt handler when DMA finishes or a phase
2619 * mismatch occurs (which would finish the DMA transfer).
2620 *
2621 * Inputs : instance - this instance of the NCR5380.
2622 *
2623 * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L
2624 * nexus has been reestablished, on failure NULL is returned.
2625 */
2626
2627#ifdef REAL_DMA
2628static void NCR5380_dma_complete(NCR5380_instance * instance) {
2629 NCR5380_local_declare();
Yoann Padioleauf8343682007-06-01 00:46:36 -07002630 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002631 int transferred;
2632 NCR5380_setup(instance);
2633
2634 /*
2635 * XXX this might not be right.
2636 *
2637 * Wait for final byte to transfer, ie wait for ACK to go false.
2638 *
2639 * We should use the Last Byte Sent bit, unfortunately this is
2640 * not available on the 5380/5381 (only the various CMOS chips)
2641 *
2642 * FIXME: timeout, and need to handle long timeout/irq case
2643 */
2644
2645 NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ);
2646
2647 NCR5380_write(MODE_REG, MR_BASE);
2648 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2649
2650 /*
2651 * The only places we should see a phase mismatch and have to send
2652 * data from the same set of pointers will be the data transfer
2653 * phases. So, residual, requested length are only important here.
2654 */
2655
2656 if (!(hostdata->connected->SCp.phase & SR_CD)) {
2657 transferred = instance->dmalen - NCR5380_dma_residual();
2658 hostdata->connected->SCp.this_residual -= transferred;
2659 hostdata->connected->SCp.ptr += transferred;
2660 }
2661}
2662#endif /* def REAL_DMA */
2663
2664/*
2665 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2666 *
2667 * Purpose : abort a command
2668 *
2669 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2670 * host byte of the result field to, if zero DID_ABORTED is
2671 * used.
2672 *
2673 * Returns : 0 - success, -1 on failure.
2674 *
2675 * XXX - there is no way to abort the command that is currently
2676 * connected, you have to wait for it to complete. If this is
2677 * a problem, we could implement longjmp() / setjmp(), setjmp()
2678 * called where the loop started in NCR5380_main().
2679 *
2680 * Locks: host lock taken by caller
2681 */
2682
2683static int NCR5380_abort(Scsi_Cmnd * cmd) {
2684 NCR5380_local_declare();
2685 struct Scsi_Host *instance = cmd->device->host;
2686 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
2687 Scsi_Cmnd *tmp, **prev;
2688
2689 printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no);
db9dff32005-04-03 14:53:59 -05002690 scsi_print_command(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002691
2692 NCR5380_print_status(instance);
2693
2694 NCR5380_setup(instance);
2695
2696 dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no));
2697 dprintk(NDEBUG_ABORT, (" basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG)));
2698
2699#if 0
2700/*
2701 * Case 1 : If the command is the currently executing command,
2702 * we'll set the aborted flag and return control so that
2703 * information transfer routine can exit cleanly.
2704 */
2705
2706 if (hostdata->connected == cmd) {
2707 dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no));
2708 hostdata->aborted = 1;
2709/*
2710 * We should perform BSY checking, and make sure we haven't slipped
2711 * into BUS FREE.
2712 */
2713
2714 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN);
2715/*
2716 * Since we can't change phases until we've completed the current
2717 * handshake, we have to source or sink a byte of data if the current
2718 * phase is not MSGOUT.
2719 */
2720
2721/*
2722 * Return control to the executing NCR drive so we can clear the
2723 * aborted flag and get back into our main loop.
2724 */
2725
2726 return 0;
2727 }
2728#endif
2729
2730/*
2731 * Case 2 : If the command hasn't been issued yet, we simply remove it
2732 * from the issue queue.
2733 */
2734
2735 dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no));
2736 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)
2737 if (cmd == tmp) {
2738 REMOVE(5, *prev, tmp, tmp->host_scribble);
2739 (*prev) = (Scsi_Cmnd *) tmp->host_scribble;
2740 tmp->host_scribble = NULL;
2741 tmp->result = DID_ABORT << 16;
2742 dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no));
2743 tmp->done(tmp);
2744 return SUCCESS;
2745 }
2746#if (NDEBUG & NDEBUG_ABORT)
2747 /* KLL */
2748 else if (prev == tmp)
2749 printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no);
2750#endif
2751
2752/*
2753 * Case 3 : If any commands are connected, we're going to fail the abort
2754 * and let the high level SCSI driver retry at a later time or
2755 * issue a reset.
2756 *
2757 * Timeouts, and therefore aborted commands, will be highly unlikely
2758 * and handling them cleanly in this situation would make the common
2759 * case of noresets less efficient, and would pollute our code. So,
2760 * we fail.
2761 */
2762
2763 if (hostdata->connected) {
2764 dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no));
2765 return FAILED;
2766 }
2767/*
2768 * Case 4: If the command is currently disconnected from the bus, and
2769 * there are no connected commands, we reconnect the I_T_L or
2770 * I_T_L_Q nexus associated with it, go into message out, and send
2771 * an abort message.
2772 *
2773 * This case is especially ugly. In order to reestablish the nexus, we
2774 * need to call NCR5380_select(). The easiest way to implement this
2775 * function was to abort if the bus was busy, and let the interrupt
2776 * handler triggered on the SEL for reselect take care of lost arbitrations
2777 * where necessary, meaning interrupts need to be enabled.
2778 *
2779 * When interrupts are enabled, the queues may change - so we
2780 * can't remove it from the disconnected queue before selecting it
2781 * because that could cause a failure in hashing the nexus if that
2782 * device reselected.
2783 *
2784 * Since the queues may change, we can't use the pointers from when we
2785 * first locate it.
2786 *
2787 * So, we must first locate the command, and if NCR5380_select()
2788 * succeeds, then issue the abort, relocate the command and remove
2789 * it from the disconnected queue.
2790 */
2791
2792 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble)
2793 if (cmd == tmp) {
2794 dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no));
2795
2796 if (NCR5380_select(instance, cmd, (int) cmd->tag))
2797 return FAILED;
2798 dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no));
2799
2800 do_abort(instance);
2801
2802 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)
2803 if (cmd == tmp) {
2804 REMOVE(5, *prev, tmp, tmp->host_scribble);
2805 *prev = (Scsi_Cmnd *) tmp->host_scribble;
2806 tmp->host_scribble = NULL;
2807 tmp->result = DID_ABORT << 16;
2808 tmp->done(tmp);
2809 return SUCCESS;
2810 }
2811 }
2812/*
2813 * Case 5 : If we reached this point, the command was not found in any of
2814 * the queues.
2815 *
2816 * We probably reached this point because of an unlikely race condition
2817 * between the command completing successfully and the abortion code,
2818 * so we won't panic, but we will notify the user in case something really
2819 * broke.
2820 */
2821 printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n"
2822 " before abortion\n", instance->host_no);
2823 return FAILED;
2824}
2825
2826
2827/*
2828 * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd)
2829 *
2830 * Purpose : reset the SCSI bus.
2831 *
2832 * Returns : SUCCESS
2833 *
2834 * Locks: host lock taken by caller
2835 */
2836
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04002837static int NCR5380_bus_reset(Scsi_Cmnd * cmd)
2838{
2839 struct Scsi_Host *instance = cmd->device->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002840
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04002841 NCR5380_local_declare();
2842 NCR5380_setup(instance);
2843 NCR5380_print_status(instance);
2844
2845 spin_lock_irq(instance->host_lock);
2846 do_reset(instance);
2847 spin_unlock_irq(instance->host_lock);
2848
Linus Torvalds1da177e2005-04-16 15:20:36 -07002849 return SUCCESS;
2850}