blob: a6aa9107288090ed544abeaf4d2a4e51bf147267 [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())
350 yield();
351 else
352 cpu_relax();
353 }
354 return -ETIMEDOUT;
355}
356
357static struct {
358 unsigned char value;
359 const char *name;
360} phases[] = {
361 {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
578static int __init NCR5380_probe_irq(struct Scsi_Host *instance, int possible)
579{
580 NCR5380_local_declare();
581 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
582 unsigned long timeout;
583 int trying_irqs, i, mask;
584 NCR5380_setup(instance);
585
586 for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1)
Thomas Gleixner1d6f3592006-07-01 19:29:42 -0700587 if ((mask & possible) && (request_irq(i, &probe_intr, IRQF_DISABLED, "NCR-probe", NULL) == 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 trying_irqs |= mask;
589
590 timeout = jiffies + (250 * HZ / 1000);
591 probe_irq = SCSI_IRQ_NONE;
592
593 /*
594 * A interrupt is triggered whenever BSY = false, SEL = true
595 * and a bit set in the SELECT_ENABLE_REG is asserted on the
596 * SCSI bus.
597 *
598 * Note that the bus is only driven when the phase control signals
599 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that
600 * to zero.
601 */
602
603 NCR5380_write(TARGET_COMMAND_REG, 0);
604 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
605 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
606 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL);
607
608 while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout))
Nishanth Aravamudana9a30472005-11-07 01:01:20 -0800609 schedule_timeout_uninterruptible(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
611 NCR5380_write(SELECT_ENABLE_REG, 0);
612 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
613
614 for (i = 0, mask = 1; i < 16; ++i, mask <<= 1)
615 if (trying_irqs & mask)
616 free_irq(i, NULL);
617
618 return probe_irq;
619}
620
621/**
622 * NCR58380_print_options - show options
623 * @instance: unused for now
624 *
625 * Called by probe code indicating the NCR5380 driver options that
626 * were selected. At some point this will switch to runtime options
627 * read from the adapter in question
628 *
629 * Locks: none
630 */
631
632static void __init NCR5380_print_options(struct Scsi_Host *instance)
633{
634 printk(" generic options"
635#ifdef AUTOPROBE_IRQ
636 " AUTOPROBE_IRQ"
637#endif
638#ifdef AUTOSENSE
639 " AUTOSENSE"
640#endif
641#ifdef DIFFERENTIAL
642 " DIFFERENTIAL"
643#endif
644#ifdef REAL_DMA
645 " REAL DMA"
646#endif
647#ifdef REAL_DMA_POLL
648 " REAL DMA POLL"
649#endif
650#ifdef PARITY
651 " PARITY"
652#endif
653#ifdef PSEUDO_DMA
654 " PSEUDO DMA"
655#endif
656#ifdef UNSAFE
657 " UNSAFE "
658#endif
659 );
660 printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP);
661 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
662 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) {
663 printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE);
664 }
665}
666
667/**
668 * NCR5380_print_status - dump controller info
669 * @instance: controller to dump
670 *
671 * Print commands in the various queues, called from NCR5380_abort
672 * and NCR5380_debug to aid debugging.
673 *
674 * Locks: called functions disable irqs
675 */
676
677static void NCR5380_print_status(struct Scsi_Host *instance)
678{
679 NCR5380_dprint(NDEBUG_ANY, instance);
680 NCR5380_dprint_phase(NDEBUG_ANY, instance);
681}
682
683/******************************************/
684/*
685 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
686 *
687 * *buffer: I/O buffer
688 * **start: if inout == FALSE pointer into buffer where user read should start
689 * offset: current offset
690 * length: length of buffer
691 * hostno: Scsi_Host host_no
692 * inout: TRUE - user is writing; FALSE - user is reading
693 *
694 * Return the number of bytes read from or written
695 */
696
697#undef SPRINTF
698#define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0)
699static
700char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length);
701static
702char *lprint_command(unsigned char *cmd, char *pos, char *buffer, int len);
703static
704char *lprint_opcode(int opcode, char *pos, char *buffer, int length);
705
706static
707int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer, char **start, off_t offset, int length, int inout)
708{
709 char *pos = buffer;
710 struct NCR5380_hostdata *hostdata;
711 Scsi_Cmnd *ptr;
712
713 hostdata = (struct NCR5380_hostdata *) instance->hostdata;
714
715 if (inout) { /* Has data been written to the file ? */
716#ifdef DTC_PUBLIC_RELEASE
717 dtc_wmaxi = dtc_maxi = 0;
718#endif
719#ifdef PAS16_PUBLIC_RELEASE
720 pas_wmaxi = pas_maxi = 0;
721#endif
722 return (-ENOSYS); /* Currently this is a no-op */
723 }
724 SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE);
725 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400)
726 SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE);
727#ifdef DTC_PUBLIC_RELEASE
728 SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE);
729#endif
730#ifdef T128_PUBLIC_RELEASE
731 SPRINTF("T128 release %d", T128_PUBLIC_RELEASE);
732#endif
733#ifdef GENERIC_NCR5380_PUBLIC_RELEASE
734 SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE);
735#endif
736#ifdef PAS16_PUBLIC_RELEASE
737 SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE);
738#endif
739
740 SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base);
741 SPRINTF("io_port: %04x ", (int) instance->io_port);
742 if (instance->irq == SCSI_IRQ_NONE)
743 SPRINTF("IRQ: None.\n");
744 else
745 SPRINTF("IRQ: %d.\n", instance->irq);
746
747#ifdef DTC_PUBLIC_RELEASE
748 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi);
749#endif
750#ifdef PAS16_PUBLIC_RELEASE
751 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi);
752#endif
753 spin_lock_irq(instance->host_lock);
754 if (!hostdata->connected)
755 SPRINTF("scsi%d: no currently connected command\n", instance->host_no);
756 else
757 pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, pos, buffer, length);
758 SPRINTF("scsi%d: issue_queue\n", instance->host_no);
759 for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
760 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
761
762 SPRINTF("scsi%d: disconnected_queue\n", instance->host_no);
763 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
764 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
765 spin_unlock_irq(instance->host_lock);
766
767 *start = buffer;
768 if (pos - buffer < offset)
769 return 0;
770 else if (pos - buffer - offset < length)
771 return pos - buffer - offset;
772 return length;
773}
774
775static char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length)
776{
777 SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun);
778 SPRINTF(" command = ");
779 pos = lprint_command(cmd->cmnd, pos, buffer, length);
780 return (pos);
781}
782
783static char *lprint_command(unsigned char *command, char *pos, char *buffer, int length)
784{
785 int i, s;
786 pos = lprint_opcode(command[0], pos, buffer, length);
787 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
788 SPRINTF("%02x ", command[i]);
789 SPRINTF("\n");
790 return (pos);
791}
792
793static char *lprint_opcode(int opcode, char *pos, char *buffer, int length)
794{
795 SPRINTF("%2d (0x%02x)", opcode, opcode);
796 return (pos);
797}
798
799
800/**
801 * NCR5380_init - initialise an NCR5380
802 * @instance: adapter to configure
803 * @flags: control flags
804 *
805 * Initializes *instance and corresponding 5380 chip,
806 * with flags OR'd into the initial flags value.
807 *
808 * Notes : I assume that the host, hostno, and id bits have been
809 * set correctly. I don't care about the irq and other fields.
810 *
811 * Returns 0 for success
812 *
813 * Locks: interrupts must be enabled when we are called
814 */
815
816static int __devinit NCR5380_init(struct Scsi_Host *instance, int flags)
817{
818 NCR5380_local_declare();
819 int i, pass;
820 unsigned long timeout;
821 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
822
823 if(in_interrupt())
824 printk(KERN_ERR "NCR5380_init called with interrupts off!\n");
825 /*
826 * On NCR53C400 boards, NCR5380 registers are mapped 8 past
827 * the base address.
828 */
829
830#ifdef NCR53C400
831 if (flags & FLAG_NCR53C400)
832 instance->NCR5380_instance_name += NCR53C400_address_adjust;
833#endif
834
835 NCR5380_setup(instance);
836
837 hostdata->aborted = 0;
838 hostdata->id_mask = 1 << instance->this_id;
839 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
840 if (i > hostdata->id_mask)
841 hostdata->id_higher_mask |= i;
842 for (i = 0; i < 8; ++i)
843 hostdata->busy[i] = 0;
844#ifdef REAL_DMA
845 hostdata->dmalen = 0;
846#endif
847 hostdata->targets_present = 0;
848 hostdata->connected = NULL;
849 hostdata->issue_queue = NULL;
850 hostdata->disconnected_queue = NULL;
851
852 INIT_WORK(&hostdata->coroutine, NCR5380_main, hostdata);
853
854#ifdef NCR5380_STATS
855 for (i = 0; i < 8; ++i) {
856 hostdata->time_read[i] = 0;
857 hostdata->time_write[i] = 0;
858 hostdata->bytes_read[i] = 0;
859 hostdata->bytes_write[i] = 0;
860 }
861 hostdata->timebase = 0;
862 hostdata->pendingw = 0;
863 hostdata->pendingr = 0;
864#endif
865
866 /* The CHECK code seems to break the 53C400. Will check it later maybe */
867 if (flags & FLAG_NCR53C400)
868 hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags;
869 else
870 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags;
871
872 hostdata->host = instance;
873 hostdata->time_expires = 0;
874
875#ifndef AUTOSENSE
876 if ((instance->cmd_per_lun > 1) || instance->can_queue > 1)
877 printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n"
878 " be incorrectly cleared.\n", instance->host_no);
879#endif /* def AUTOSENSE */
880
881 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
882 NCR5380_write(MODE_REG, MR_BASE);
883 NCR5380_write(TARGET_COMMAND_REG, 0);
884 NCR5380_write(SELECT_ENABLE_REG, 0);
885
886#ifdef NCR53C400
887 if (hostdata->flags & FLAG_NCR53C400) {
888 NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
889 }
890#endif
891
892 /*
893 * Detect and correct bus wedge problems.
894 *
895 * If the system crashed, it may have crashed in a state
896 * where a SCSI command was still executing, and the
897 * SCSI bus is not in a BUS FREE STATE.
898 *
899 * If this is the case, we'll try to abort the currently
900 * established nexus which we know nothing about, and that
901 * failing, do a hard reset of the SCSI bus
902 */
903
904 for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) {
905 switch (pass) {
906 case 1:
907 case 3:
908 case 5:
909 printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no);
910 timeout = jiffies + 5 * HZ;
911 NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ);
912 break;
913 case 2:
914 printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no);
915 do_abort(instance);
916 break;
917 case 4:
918 printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no);
919 do_reset(instance);
920 break;
921 case 6:
922 printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no);
923 return -ENXIO;
924 }
925 }
926 return 0;
927}
928
929/**
930 * NCR5380_exit - remove an NCR5380
931 * @instance: adapter to remove
932 */
933
934static void __devexit NCR5380_exit(struct Scsi_Host *instance)
935{
936 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
937
938 cancel_delayed_work(&hostdata->coroutine);
939 flush_scheduled_work();
940}
941
942/**
943 * NCR5380_queue_command - queue a command
944 * @cmd: SCSI command
945 * @done: completion handler
946 *
947 * cmd is added to the per instance issue_queue, with minor
948 * twiddling done to the host specific fields of cmd. If the
949 * main coroutine is not running, it is restarted.
950 *
951 * Locks: host lock taken by caller
952 */
953
954static int NCR5380_queue_command(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
955{
956 struct Scsi_Host *instance = cmd->device->host;
957 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
958 Scsi_Cmnd *tmp;
959
960#if (NDEBUG & NDEBUG_NO_WRITE)
961 switch (cmd->cmnd[0]) {
962 case WRITE_6:
963 case WRITE_10:
964 printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no);
965 cmd->result = (DID_ERROR << 16);
966 done(cmd);
967 return 0;
968 }
969#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
970
971#ifdef NCR5380_STATS
972 switch (cmd->cmnd[0]) {
973 case WRITE:
974 case WRITE_6:
975 case WRITE_10:
976 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
977 hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;
978 hostdata->pendingw++;
979 break;
980 case READ:
981 case READ_6:
982 case READ_10:
983 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
984 hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;
985 hostdata->pendingr++;
986 break;
987 }
988#endif
989
990 /*
991 * We use the host_scribble field as a pointer to the next command
992 * in a queue
993 */
994
995 cmd->host_scribble = NULL;
996 cmd->scsi_done = done;
997 cmd->result = 0;
998
999 /*
1000 * Insert the cmd into the issue queue. Note that REQUEST SENSE
1001 * commands are added to the head of the queue since any command will
1002 * clear the contingent allegiance condition that exists and the
1003 * sense data is only guaranteed to be valid while the condition exists.
1004 */
1005
1006 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
1007 LIST(cmd, hostdata->issue_queue);
1008 cmd->host_scribble = (unsigned char *) hostdata->issue_queue;
1009 hostdata->issue_queue = cmd;
1010 } else {
1011 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble);
1012 LIST(cmd, tmp);
1013 tmp->host_scribble = (unsigned char *) cmd;
1014 }
1015 dprintk(NDEBUG_QUEUES, ("scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"));
1016
1017 /* Run the coroutine if it isn't already running. */
1018 /* Kick off command processing */
1019 schedule_work(&hostdata->coroutine);
1020 return 0;
1021}
1022
1023
1024/**
1025 * NCR5380_main - NCR state machines
1026 *
1027 * NCR5380_main is a coroutine that runs as long as more work can
1028 * be done on the NCR5380 host adapters in a system. Both
1029 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1030 * in case it is not running.
1031 *
1032 * Locks: called as its own thread with no locks held. Takes the
1033 * host lock and called routines may take the isa dma lock.
1034 */
1035
1036static void NCR5380_main(void *p)
1037{
1038 struct NCR5380_hostdata *hostdata = p;
1039 struct Scsi_Host *instance = hostdata->host;
1040 Scsi_Cmnd *tmp, *prev;
1041 int done;
1042
1043 spin_lock_irq(instance->host_lock);
1044 do {
1045 /* Lock held here */
1046 done = 1;
1047 if (!hostdata->connected && !hostdata->selecting) {
1048 dprintk(NDEBUG_MAIN, ("scsi%d : not connected\n", instance->host_no));
1049 /*
1050 * Search through the issue_queue for a command destined
1051 * for a target that's not busy.
1052 */
1053 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
1054 {
1055 if (prev != tmp)
1056 dprintk(NDEBUG_LISTS, ("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun));
1057 /* When we find one, remove it from the issue queue. */
1058 if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) {
1059 if (prev) {
1060 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
1061 prev->host_scribble = tmp->host_scribble;
1062 } else {
1063 REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble);
1064 hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble;
1065 }
1066 tmp->host_scribble = NULL;
1067
1068 /*
1069 * Attempt to establish an I_T_L nexus here.
1070 * On success, instance->hostdata->connected is set.
1071 * On failure, we must add the command back to the
1072 * issue queue so we can keep trying.
1073 */
1074 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));
1075
1076 /*
1077 * A successful selection is defined as one that
1078 * leaves us with the command connected and
1079 * in hostdata->connected, OR has terminated the
1080 * command.
1081 *
1082 * With successful commands, we fall through
1083 * and see if we can do an information transfer,
1084 * with failures we will restart.
1085 */
1086 hostdata->selecting = NULL;
1087 /* RvC: have to preset this to indicate a new command is being performed */
1088
1089 if (!NCR5380_select(instance, tmp,
1090 /*
1091 * REQUEST SENSE commands are issued without tagged
1092 * queueing, even on SCSI-II devices because the
1093 * contingent allegiance condition exists for the
1094 * entire unit.
1095 */
1096 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
1097 break;
1098 } else {
1099 LIST(tmp, hostdata->issue_queue);
1100 tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1101 hostdata->issue_queue = tmp;
1102 done = 0;
1103 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no));
1104 }
1105 /* lock held here still */
1106 } /* if target/lun is not busy */
1107 } /* for */
1108 /* exited locked */
1109 } /* if (!hostdata->connected) */
1110 if (hostdata->selecting) {
1111 tmp = (Scsi_Cmnd *) hostdata->selecting;
1112 /* Selection will drop and retake the lock */
1113 if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
1114 /* Ok ?? */
1115 } else {
1116 /* RvC: device failed, so we wait a long time
1117 this is needed for Mustek scanners, that
1118 do not respond to commands immediately
1119 after a scan */
1120 printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id);
1121 LIST(tmp, hostdata->issue_queue);
1122 tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1123 hostdata->issue_queue = tmp;
1124 NCR5380_set_timer(hostdata, USLEEP_WAITLONG);
1125 }
1126 } /* if hostdata->selecting */
1127 if (hostdata->connected
1128#ifdef REAL_DMA
1129 && !hostdata->dmalen
1130#endif
1131 && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies))
1132 ) {
1133 dprintk(NDEBUG_MAIN, ("scsi%d : main() : performing information transfer\n", instance->host_no));
1134 NCR5380_information_transfer(instance);
1135 dprintk(NDEBUG_MAIN, ("scsi%d : main() : done set false\n", instance->host_no));
1136 done = 0;
1137 } else
1138 break;
1139 } while (!done);
1140
1141 spin_unlock_irq(instance->host_lock);
1142}
1143
1144#ifndef DONT_USE_INTR
1145
1146/**
1147 * NCR5380_intr - generic NCR5380 irq handler
1148 * @irq: interrupt number
1149 * @dev_id: device info
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 *
1151 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1152 * from the disconnected queue, and restarting NCR5380_main()
1153 * as required.
1154 *
1155 * Locks: takes the needed instance locks
1156 */
1157
David Howells7d12e782006-10-05 14:55:46 +01001158static irqreturn_t NCR5380_intr(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159{
1160 NCR5380_local_declare();
1161 struct Scsi_Host *instance = (struct Scsi_Host *)dev_id;
1162 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1163 int done;
1164 unsigned char basr;
1165 unsigned long flags;
1166
1167 dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n", irq));
1168
1169 do {
1170 done = 1;
1171 spin_lock_irqsave(instance->host_lock, flags);
1172 /* Look for pending interrupts */
1173 NCR5380_setup(instance);
1174 basr = NCR5380_read(BUS_AND_STATUS_REG);
1175 /* XXX dispatch to appropriate routine if found and done=0 */
1176 if (basr & BASR_IRQ) {
1177 NCR5380_dprint(NDEBUG_INTR, instance);
1178 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1179 done = 0;
1180 dprintk(NDEBUG_INTR, ("scsi%d : SEL interrupt\n", instance->host_no));
1181 NCR5380_reselect(instance);
1182 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1183 } else if (basr & BASR_PARITY_ERROR) {
1184 dprintk(NDEBUG_INTR, ("scsi%d : PARITY interrupt\n", instance->host_no));
1185 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1186 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1187 dprintk(NDEBUG_INTR, ("scsi%d : RESET interrupt\n", instance->host_no));
1188 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1189 } else {
1190#if defined(REAL_DMA)
1191 /*
1192 * We should only get PHASE MISMATCH and EOP interrupts
1193 * if we have DMA enabled, so do a sanity check based on
1194 * the current setting of the MODE register.
1195 */
1196
1197 if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) {
1198 int transfered;
1199
1200 if (!hostdata->connected)
1201 panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno);
1202
1203 transfered = (hostdata->dmalen - NCR5380_dma_residual(instance));
1204 hostdata->connected->SCp.this_residual -= transferred;
1205 hostdata->connected->SCp.ptr += transferred;
1206 hostdata->dmalen = 0;
1207
1208 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1209
1210 /* FIXME: we need to poll briefly then defer a workqueue task ! */
1211 NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ);
1212
1213 NCR5380_write(MODE_REG, MR_BASE);
1214 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1215 }
1216#else
1217 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)));
1218 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1219#endif
1220 }
1221 } /* if BASR_IRQ */
1222 spin_unlock_irqrestore(instance->host_lock, flags);
1223 if(!done)
1224 schedule_work(&hostdata->coroutine);
1225 } while (!done);
1226 return IRQ_HANDLED;
1227}
1228
1229#endif
1230
1231/**
1232 * collect_stats - collect stats on a scsi command
1233 * @hostdata: adapter
1234 * @cmd: command being issued
1235 *
1236 * Update the statistical data by parsing the command in question
1237 */
1238
1239static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd)
1240{
1241#ifdef NCR5380_STATS
1242 switch (cmd->cmnd[0]) {
1243 case WRITE:
1244 case WRITE_6:
1245 case WRITE_10:
Jeff Garzik422c0d62005-10-24 18:05:09 -04001246 hostdata->time_write[scmd_id(cmd)] += (jiffies - hostdata->timebase);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 hostdata->pendingw--;
1248 break;
1249 case READ:
1250 case READ_6:
1251 case READ_10:
Jeff Garzik422c0d62005-10-24 18:05:09 -04001252 hostdata->time_read[scmd_id(cmd)] += (jiffies - hostdata->timebase);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 hostdata->pendingr--;
1254 break;
1255 }
1256#endif
1257}
1258
1259
1260/*
1261 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
1262 * int tag);
1263 *
1264 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1265 * including ARBITRATION, SELECTION, and initial message out for
1266 * IDENTIFY and queue messages.
1267 *
1268 * Inputs : instance - instantiation of the 5380 driver on which this
1269 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1270 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1271 * the command that is presently connected.
1272 *
1273 * Returns : -1 if selection could not execute for some reason,
1274 * 0 if selection succeeded or failed because the target
1275 * did not respond.
1276 *
1277 * Side effects :
1278 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1279 * with registers as they should have been on entry - ie
1280 * SELECT_ENABLE will be set appropriately, the NCR5380
1281 * will cease to drive any SCSI bus signals.
1282 *
1283 * If successful : I_T_L or I_T_L_Q nexus will be established,
1284 * instance->connected will be set to cmd.
1285 * SELECT interrupt will be disabled.
1286 *
1287 * If failed (no target) : cmd->scsi_done() will be called, and the
1288 * cmd->result host byte set to DID_BAD_TARGET.
1289 *
1290 * Locks: caller holds hostdata lock in IRQ mode
1291 */
1292
1293static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag)
1294{
1295 NCR5380_local_declare();
1296 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1297 unsigned char tmp[3], phase;
1298 unsigned char *data;
1299 int len;
1300 unsigned long timeout;
1301 unsigned char value;
1302 int err;
1303 NCR5380_setup(instance);
1304
1305 if (hostdata->selecting)
1306 goto part2;
1307
1308 hostdata->restart_select = 0;
1309
1310 NCR5380_dprint(NDEBUG_ARBITRATION, instance);
1311 dprintk(NDEBUG_ARBITRATION, ("scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id));
1312
1313 /*
1314 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1315 * data bus during SELECTION.
1316 */
1317
1318 NCR5380_write(TARGET_COMMAND_REG, 0);
1319
1320 /*
1321 * Start arbitration.
1322 */
1323
1324 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1325 NCR5380_write(MODE_REG, MR_ARBITRATE);
1326
1327
1328 /* We can be relaxed here, interrupts are on, we are
1329 in workqueue context, the birds are singing in the trees */
1330 spin_unlock_irq(instance->host_lock);
1331 err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ);
1332 spin_lock_irq(instance->host_lock);
1333 if (err < 0) {
1334 printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__);
1335 NCR5380_write(MODE_REG, MR_BASE);
1336 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1337 goto failed;
1338 }
1339
1340 dprintk(NDEBUG_ARBITRATION, ("scsi%d : arbitration complete\n", instance->host_no));
1341
1342 /*
1343 * The arbitration delay is 2.2us, but this is a minimum and there is
1344 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1345 * the integral nature of udelay().
1346 *
1347 */
1348
1349 udelay(3);
1350
1351 /* Check for lost arbitration */
1352 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)) {
1353 NCR5380_write(MODE_REG, MR_BASE);
1354 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no));
1355 goto failed;
1356 }
1357 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL);
1358
1359 if (!(hostdata->flags & FLAG_DTC3181E) &&
1360 /* RvC: DTC3181E has some trouble with this
1361 * so we simply removed it. Seems to work with
1362 * only Mustek scanner attached
1363 */
1364 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
1365 NCR5380_write(MODE_REG, MR_BASE);
1366 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1367 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no));
1368 goto failed;
1369 }
1370 /*
1371 * Again, bus clear + bus settle time is 1.2us, however, this is
1372 * a minimum so we'll udelay ceil(1.2)
1373 */
1374
1375 udelay(2);
1376
1377 dprintk(NDEBUG_ARBITRATION, ("scsi%d : won arbitration\n", instance->host_no));
1378
1379 /*
1380 * Now that we have won arbitration, start Selection process, asserting
1381 * the host and target ID's on the SCSI bus.
1382 */
1383
Jeff Garzik422c0d62005-10-24 18:05:09 -04001384 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd))));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385
1386 /*
1387 * Raise ATN while SEL is true before BSY goes false from arbitration,
1388 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1389 * phase immediately after selection.
1390 */
1391
1392 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1393 NCR5380_write(MODE_REG, MR_BASE);
1394
1395 /*
1396 * Reselect interrupts must be turned off prior to the dropping of BSY,
1397 * otherwise we will trigger an interrupt.
1398 */
1399 NCR5380_write(SELECT_ENABLE_REG, 0);
1400
1401 /*
1402 * The initiator shall then wait at least two deskew delays and release
1403 * the BSY signal.
1404 */
1405 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1406
1407 /* Reset BSY */
1408 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1409
1410 /*
1411 * Something weird happens when we cease to drive BSY - looks
1412 * like the board/chip is letting us do another read before the
1413 * appropriate propagation delay has expired, and we're confusing
1414 * a BSY signal from ourselves as the target's response to SELECTION.
1415 *
1416 * A small delay (the 'C++' frontend breaks the pipeline with an
1417 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1418 * tighter 'C' code breaks and requires this) solves the problem -
1419 * the 1 us delay is arbitrary, and only used because this delay will
1420 * be the same on other platforms and since it works here, it should
1421 * work there.
1422 *
1423 * wingel suggests that this could be due to failing to wait
1424 * one deskew delay.
1425 */
1426
1427 udelay(1);
1428
Jeff Garzik422c0d62005-10-24 18:05:09 -04001429 dprintk(NDEBUG_SELECTION, ("scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430
1431 /*
1432 * The SCSI specification calls for a 250 ms timeout for the actual
1433 * selection.
1434 */
1435
1436 timeout = jiffies + (250 * HZ / 1000);
1437
1438 /*
1439 * XXX very interesting - we're seeing a bounce where the BSY we
1440 * asserted is being reflected / still asserted (propagation delay?)
1441 * and it's detecting as true. Sigh.
1442 */
1443
1444 hostdata->select_time = 0; /* we count the clock ticks at which we polled */
1445 hostdata->selecting = cmd;
1446
1447part2:
1448 /* RvC: here we enter after a sleeping period, or immediately after
1449 execution of part 1
1450 we poll only once ech clock tick */
1451 value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO);
1452
1453 if (!value && (hostdata->select_time < HZ/4)) {
1454 /* RvC: we still must wait for a device response */
1455 hostdata->select_time++; /* after 25 ticks the device has failed */
1456 NCR5380_set_timer(hostdata, 1);
1457 return 0; /* RvC: we return here with hostdata->selecting set,
1458 to go to sleep */
1459 }
1460
1461 hostdata->selecting = NULL;/* clear this pointer, because we passed the
1462 waiting period */
1463 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1464 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1465 NCR5380_reselect(instance);
1466 printk("scsi%d : reselection after won arbitration?\n", instance->host_no);
1467 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1468 return -1;
1469 }
1470 /*
1471 * No less than two deskew delays after the initiator detects the
1472 * BSY signal is true, it shall release the SEL signal and may
1473 * change the DATA BUS. -wingel
1474 */
1475
1476 udelay(1);
1477
1478 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1479
1480 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1481 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
Jeff Garzik422c0d62005-10-24 18:05:09 -04001482 if (hostdata->targets_present & (1 << scmd_id(cmd))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no);
1484 if (hostdata->restart_select)
1485 printk(KERN_DEBUG "\trestart select\n");
1486 NCR5380_dprint(NDEBUG_SELECTION, instance);
1487 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1488 return -1;
1489 }
1490 cmd->result = DID_BAD_TARGET << 16;
1491 collect_stats(hostdata, cmd);
1492 cmd->scsi_done(cmd);
1493 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1494 dprintk(NDEBUG_SELECTION, ("scsi%d : target did not respond within 250ms\n", instance->host_no));
1495 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1496 return 0;
1497 }
Jeff Garzik422c0d62005-10-24 18:05:09 -04001498 hostdata->targets_present |= (1 << scmd_id(cmd));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499
1500 /*
1501 * Since we followed the SCSI spec, and raised ATN while SEL
1502 * was true but before BSY was false during selection, the information
1503 * transfer phase should be a MESSAGE OUT phase so that we can send the
1504 * IDENTIFY message.
1505 *
1506 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1507 * message (2 bytes) with a tag ID that we increment with every command
1508 * until it wraps back to 0.
1509 *
1510 * XXX - it turns out that there are some broken SCSI-II devices,
1511 * which claim to support tagged queuing but fail when more than
1512 * some number of commands are issued at once.
1513 */
1514
1515 /* Wait for start of REQ/ACK handshake */
1516
1517 spin_unlock_irq(instance->host_lock);
1518 err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ);
1519 spin_lock_irq(instance->host_lock);
1520
1521 if(err) {
1522 printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__);
1523 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1524 goto failed;
1525 }
1526
1527 dprintk(NDEBUG_SELECTION, ("scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id));
1528 tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun);
1529
1530 len = 1;
1531 cmd->tag = 0;
1532
1533 /* Send message(s) */
1534 data = tmp;
1535 phase = PHASE_MSGOUT;
1536 NCR5380_transfer_pio(instance, &phase, &len, &data);
1537 dprintk(NDEBUG_SELECTION, ("scsi%d : nexus established.\n", instance->host_no));
1538 /* XXX need to handle errors here */
1539 hostdata->connected = cmd;
1540 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1541
1542 if (cmd->SCp.ptr != (char *)cmd->sense_buffer) {
1543 initialize_SCp(cmd);
1544 }
1545
1546 return 0;
1547
1548 /* Selection failed */
1549failed:
1550 return -1;
1551
1552}
1553
1554/*
1555 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1556 * unsigned char *phase, int *count, unsigned char **data)
1557 *
1558 * Purpose : transfers data in given phase using polled I/O
1559 *
1560 * Inputs : instance - instance of driver, *phase - pointer to
1561 * what phase is expected, *count - pointer to number of
1562 * bytes to transfer, **data - pointer to data pointer.
1563 *
1564 * Returns : -1 when different phase is entered without transferring
1565 * maximum number of bytes, 0 if all bytes or transfered or exit
1566 * is in same phase.
1567 *
1568 * Also, *phase, *count, *data are modified in place.
1569 *
1570 * XXX Note : handling for bus free may be useful.
1571 */
1572
1573/*
1574 * Note : this code is not as quick as it could be, however it
1575 * IS 100% reliable, and for the actual data transfer where speed
1576 * counts, we will always do a pseudo DMA or DMA transfer.
1577 */
1578
1579static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1580 NCR5380_local_declare();
1581 unsigned char p = *phase, tmp;
1582 int c = *count;
1583 unsigned char *d = *data;
1584 /*
1585 * RvC: some administrative data to process polling time
1586 */
1587 int break_allowed = 0;
1588 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1589 NCR5380_setup(instance);
1590
1591 if (!(p & SR_IO))
1592 dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c));
1593 else
1594 dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c));
1595
1596 /*
1597 * The NCR5380 chip will only drive the SCSI bus when the
1598 * phase specified in the appropriate bits of the TARGET COMMAND
1599 * REGISTER match the STATUS REGISTER
1600 */
1601
1602 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1603
1604 /* RvC: don't know if this is necessary, but other SCSI I/O is short
1605 * so breaks are not necessary there
1606 */
1607 if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) {
1608 break_allowed = 1;
1609 }
1610 do {
1611 /*
1612 * Wait for assertion of REQ, after which the phase bits will be
1613 * valid
1614 */
1615
1616 /* RvC: we simply poll once, after that we stop temporarily
1617 * and let the device buffer fill up
1618 * if breaking is not allowed, we keep polling as long as needed
1619 */
1620
1621 /* FIXME */
1622 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed);
1623 if (!(tmp & SR_REQ)) {
1624 /* timeout condition */
1625 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
1626 break;
1627 }
1628
1629 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no));
1630
1631 /* Check for phase mismatch */
1632 if ((tmp & PHASE_MASK) != p) {
1633 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no));
1634 NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance);
1635 break;
1636 }
1637 /* Do actual transfer from SCSI bus to / from memory */
1638 if (!(p & SR_IO))
1639 NCR5380_write(OUTPUT_DATA_REG, *d);
1640 else
1641 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1642
1643 ++d;
1644
1645 /*
1646 * The SCSI standard suggests that in MSGOUT phase, the initiator
1647 * should drop ATN on the last byte of the message phase
1648 * after REQ has been asserted for the handshake but before
1649 * the initiator raises ACK.
1650 */
1651
1652 if (!(p & SR_IO)) {
1653 if (!((p & SR_MSG) && c > 1)) {
1654 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1655 NCR5380_dprint(NDEBUG_PIO, instance);
1656 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1657 } else {
1658 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1659 NCR5380_dprint(NDEBUG_PIO, instance);
1660 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1661 }
1662 } else {
1663 NCR5380_dprint(NDEBUG_PIO, instance);
1664 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1665 }
1666
1667 /* FIXME - if this fails bus reset ?? */
1668 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ);
1669 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no));
1670
1671/*
1672 * We have several special cases to consider during REQ/ACK handshaking :
1673 * 1. We were in MSGOUT phase, and we are on the last byte of the
1674 * message. ATN must be dropped as ACK is dropped.
1675 *
1676 * 2. We are in a MSGIN phase, and we are on the last byte of the
1677 * message. We must exit with ACK asserted, so that the calling
1678 * code may raise ATN before dropping ACK to reject the message.
1679 *
1680 * 3. ACK and ATN are clear and the target may proceed as normal.
1681 */
1682 if (!(p == PHASE_MSGIN && c == 1)) {
1683 if (p == PHASE_MSGOUT && c > 1)
1684 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1685 else
1686 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1687 }
1688 } while (--c);
1689
1690 dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c));
1691
1692 *count = c;
1693 *data = d;
1694 tmp = NCR5380_read(STATUS_REG);
1695 if (tmp & SR_REQ)
1696 *phase = tmp & PHASE_MASK;
1697 else
1698 *phase = PHASE_UNKNOWN;
1699
1700 if (!c || (*phase == p))
1701 return 0;
1702 else
1703 return -1;
1704}
1705
1706/**
1707 * do_reset - issue a reset command
1708 * @host: adapter to reset
1709 *
1710 * Issue a reset sequence to the NCR5380 and try and get the bus
1711 * back into sane shape.
1712 *
1713 * Locks: caller holds queue lock
1714 */
1715
1716static void do_reset(struct Scsi_Host *host) {
1717 NCR5380_local_declare();
1718 NCR5380_setup(host);
1719
1720 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
1721 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
1722 udelay(25);
1723 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1724}
1725
1726/*
1727 * Function : do_abort (Scsi_Host *host)
1728 *
1729 * Purpose : abort the currently established nexus. Should only be
1730 * called from a routine which can drop into a
1731 *
1732 * Returns : 0 on success, -1 on failure.
1733 *
1734 * Locks: queue lock held by caller
1735 * FIXME: sort this out and get new_eh running
1736 */
1737
1738static int do_abort(struct Scsi_Host *host) {
1739 NCR5380_local_declare();
1740 unsigned char *msgptr, phase, tmp;
1741 int len;
1742 int rc;
1743 NCR5380_setup(host);
1744
1745
1746 /* Request message out phase */
1747 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1748
1749 /*
1750 * Wait for the target to indicate a valid phase by asserting
1751 * REQ. Once this happens, we'll have either a MSGOUT phase
1752 * and can immediately send the ABORT message, or we'll have some
1753 * other phase and will have to source/sink data.
1754 *
1755 * We really don't care what value was on the bus or what value
1756 * the target sees, so we just handshake.
1757 */
1758
1759 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ);
1760
1761 if(rc < 0)
1762 return -1;
1763
1764 tmp = (unsigned char)rc;
1765
1766 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1767
1768 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1769 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1770 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ);
1771 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1772 if(rc == -1)
1773 return -1;
1774 }
1775 tmp = ABORT;
1776 msgptr = &tmp;
1777 len = 1;
1778 phase = PHASE_MSGOUT;
1779 NCR5380_transfer_pio(host, &phase, &len, &msgptr);
1780
1781 /*
1782 * If we got here, and the command completed successfully,
1783 * we're about to go into bus free state.
1784 */
1785
1786 return len ? -1 : 0;
1787}
1788
1789#if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL)
1790/*
1791 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1792 * unsigned char *phase, int *count, unsigned char **data)
1793 *
1794 * Purpose : transfers data in given phase using either real
1795 * or pseudo DMA.
1796 *
1797 * Inputs : instance - instance of driver, *phase - pointer to
1798 * what phase is expected, *count - pointer to number of
1799 * bytes to transfer, **data - pointer to data pointer.
1800 *
1801 * Returns : -1 when different phase is entered without transferring
1802 * maximum number of bytes, 0 if all bytes or transfered or exit
1803 * is in same phase.
1804 *
1805 * Also, *phase, *count, *data are modified in place.
1806 *
1807 * Locks: io_request lock held by caller
1808 */
1809
1810
1811static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1812 NCR5380_local_declare();
1813 register int c = *count;
1814 register unsigned char p = *phase;
1815 register unsigned char *d = *data;
1816 unsigned char tmp;
1817 int foo;
1818#if defined(REAL_DMA_POLL)
1819 int cnt, toPIO;
1820 unsigned char saved_data = 0, overrun = 0, residue;
1821#endif
1822
1823 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1824
1825 NCR5380_setup(instance);
1826
1827 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1828 *phase = tmp;
1829 return -1;
1830 }
1831#if defined(REAL_DMA) || defined(REAL_DMA_POLL)
1832#ifdef READ_OVERRUNS
1833 if (p & SR_IO) {
1834 c -= 2;
1835 }
1836#endif
1837 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));
1838 hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c);
1839#endif
1840
1841 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1842
1843#ifdef REAL_DMA
1844 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
1845#elif defined(REAL_DMA_POLL)
1846 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
1847#else
1848 /*
1849 * Note : on my sample board, watch-dog timeouts occurred when interrupts
1850 * were not disabled for the duration of a single DMA transfer, from
1851 * before the setting of DMA mode to after transfer of the last byte.
1852 */
1853
1854#if defined(PSEUDO_DMA) && defined(UNSAFE)
1855 spin_unlock_irq(instance->host_lock);
1856#endif
1857 /* KLL May need eop and parity in 53c400 */
1858 if (hostdata->flags & FLAG_NCR53C400)
1859 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);
1860 else
1861 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
1862#endif /* def REAL_DMA */
1863
1864 dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG)));
1865
1866 /*
1867 * On the PAS16 at least I/O recovery delays are not needed here.
1868 * Everyone else seems to want them.
1869 */
1870
1871 if (p & SR_IO) {
1872 io_recovery_delay(1);
1873 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1874 } else {
1875 io_recovery_delay(1);
1876 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1877 io_recovery_delay(1);
1878 NCR5380_write(START_DMA_SEND_REG, 0);
1879 io_recovery_delay(1);
1880 }
1881
1882#if defined(REAL_DMA_POLL)
1883 do {
1884 tmp = NCR5380_read(BUS_AND_STATUS_REG);
1885 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER)));
1886
1887/*
1888 At this point, either we've completed DMA, or we have a phase mismatch,
1889 or we've unexpectedly lost BUSY (which is a real error).
1890
1891 For write DMAs, we want to wait until the last byte has been
1892 transferred out over the bus before we turn off DMA mode. Alas, there
1893 seems to be no terribly good way of doing this on a 5380 under all
1894 conditions. For non-scatter-gather operations, we can wait until REQ
1895 and ACK both go false, or until a phase mismatch occurs. Gather-writes
1896 are nastier, since the device will be expecting more data than we
1897 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
1898 could test LAST BIT SENT to assure transfer (I imagine this is precisely
1899 why this signal was added to the newer chips) but on the older 538[01]
1900 this signal does not exist. The workaround for this lack is a watchdog;
1901 we bail out of the wait-loop after a modest amount of wait-time if
1902 the usual exit conditions are not met. Not a terribly clean or
1903 correct solution :-%
1904
1905 Reads are equally tricky due to a nasty characteristic of the NCR5380.
1906 If the chip is in DMA mode for an READ, it will respond to a target's
1907 REQ by latching the SCSI data into the INPUT DATA register and asserting
1908 ACK, even if it has _already_ been notified by the DMA controller that
1909 the current DMA transfer has completed! If the NCR5380 is then taken
1910 out of DMA mode, this already-acknowledged byte is lost.
1911
1912 This is not a problem for "one DMA transfer per command" reads, because
1913 the situation will never arise... either all of the data is DMA'ed
1914 properly, or the target switches to MESSAGE IN phase to signal a
1915 disconnection (either operation bringing the DMA to a clean halt).
1916 However, in order to handle scatter-reads, we must work around the
1917 problem. The chosen fix is to DMA N-2 bytes, then check for the
1918 condition before taking the NCR5380 out of DMA mode. One or two extra
1919 bytes are transferred via PIO as necessary to fill out the original
1920 request.
1921 */
1922
1923 if (p & SR_IO) {
1924#ifdef READ_OVERRUNS
1925 udelay(10);
1926 if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) {
1927 saved_data = NCR5380_read(INPUT_DATA_REGISTER);
1928 overrun = 1;
1929 }
1930#endif
1931 } else {
1932 int limit = 100;
1933 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) {
1934 if (!(tmp & BASR_PHASE_MATCH))
1935 break;
1936 if (--limit < 0)
1937 break;
1938 }
1939 }
1940
1941 dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG)));
1942
1943 NCR5380_write(MODE_REG, MR_BASE);
1944 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1945
1946 residue = NCR5380_dma_residual(instance);
1947 c -= residue;
1948 *count -= c;
1949 *data += c;
1950 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
1951
1952#ifdef READ_OVERRUNS
1953 if (*phase == p && (p & SR_IO) && residue == 0) {
1954 if (overrun) {
1955 dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n"));
1956 **data = saved_data;
1957 *data += 1;
1958 *count -= 1;
1959 cnt = toPIO = 1;
1960 } else {
1961 printk("No overrun??\n");
1962 cnt = toPIO = 2;
1963 }
1964 dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data));
1965 NCR5380_transfer_pio(instance, phase, &cnt, data);
1966 *count -= toPIO - cnt;
1967 }
1968#endif
1969
1970 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)));
1971 return 0;
1972
1973#elif defined(REAL_DMA)
1974 return 0;
1975#else /* defined(REAL_DMA_POLL) */
1976 if (p & SR_IO) {
1977#ifdef DMA_WORKS_RIGHT
1978 foo = NCR5380_pread(instance, d, c);
1979#else
1980 int diff = 1;
1981 if (hostdata->flags & FLAG_NCR53C400) {
1982 diff = 0;
1983 }
1984 if (!(foo = NCR5380_pread(instance, d, c - diff))) {
1985 /*
1986 * We can't disable DMA mode after successfully transferring
1987 * what we plan to be the last byte, since that would open up
1988 * a race condition where if the target asserted REQ before
1989 * we got the DMA mode reset, the NCR5380 would have latched
1990 * an additional byte into the INPUT DATA register and we'd
1991 * have dropped it.
1992 *
1993 * The workaround was to transfer one fewer bytes than we
1994 * intended to with the pseudo-DMA read function, wait for
1995 * the chip to latch the last byte, read it, and then disable
1996 * pseudo-DMA mode.
1997 *
1998 * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
1999 * REQ is deasserted when ACK is asserted, and not reasserted
2000 * until ACK goes false. Since the NCR5380 won't lower ACK
2001 * until DACK is asserted, which won't happen unless we twiddle
2002 * the DMA port or we take the NCR5380 out of DMA mode, we
2003 * can guarantee that we won't handshake another extra
2004 * byte.
2005 */
2006
2007 if (!(hostdata->flags & FLAG_NCR53C400)) {
2008 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ));
2009 /* Wait for clean handshake */
2010 while (NCR5380_read(STATUS_REG) & SR_REQ);
2011 d[c - 1] = NCR5380_read(INPUT_DATA_REG);
2012 }
2013 }
2014#endif
2015 } else {
2016#ifdef DMA_WORKS_RIGHT
2017 foo = NCR5380_pwrite(instance, d, c);
2018#else
2019 int timeout;
2020 dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c));
2021 if (!(foo = NCR5380_pwrite(instance, d, c))) {
2022 /*
2023 * Wait for the last byte to be sent. If REQ is being asserted for
2024 * the byte we're interested, we'll ACK it and it will go false.
2025 */
2026 if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) {
2027 timeout = 20000;
2028 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH));
2029
2030 if (!timeout)
2031 dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no));
2032
2033 if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) {
2034 hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT;
2035 if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) {
2036 hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT;
2037 dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no));
2038 }
2039 }
2040 } else {
2041 dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n"));
2042 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT));
2043 dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n"));
2044 }
2045 }
2046#endif
2047 }
2048 NCR5380_write(MODE_REG, MR_BASE);
2049 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2050
2051 if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) {
2052 dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n"));
2053 if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) {
2054 dprintk(NDEBUG_C400_PWRITE, ("53C400w: got it, reading reset interrupt reg\n"));
2055 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
2056 } else {
2057 printk("53C400w: IRQ NOT THERE!\n");
2058 }
2059 }
2060 *data = d + c;
2061 *count = 0;
2062 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
2063#if defined(PSEUDO_DMA) && defined(UNSAFE)
2064 spin_lock_irq(instance->host_lock);
2065#endif /* defined(REAL_DMA_POLL) */
2066 return foo;
2067#endif /* def REAL_DMA */
2068}
2069#endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */
2070
2071/*
2072 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
2073 *
2074 * Purpose : run through the various SCSI phases and do as the target
2075 * directs us to. Operates on the currently connected command,
2076 * instance->connected.
2077 *
2078 * Inputs : instance, instance for which we are doing commands
2079 *
2080 * Side effects : SCSI things happen, the disconnected queue will be
2081 * modified if a command disconnects, *instance->connected will
2082 * change.
2083 *
2084 * XXX Note : we need to watch for bus free or a reset condition here
2085 * to recover from an unexpected bus free condition.
2086 *
2087 * Locks: io_request_lock held by caller in IRQ mode
2088 */
2089
2090static void NCR5380_information_transfer(struct Scsi_Host *instance) {
2091 NCR5380_local_declare();
2092 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata;
2093 unsigned char msgout = NOP;
2094 int sink = 0;
2095 int len;
2096#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2097 int transfersize;
2098#endif
2099 unsigned char *data;
2100 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
2101 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
2102 /* RvC: we need to set the end of the polling time */
2103 unsigned long poll_time = jiffies + USLEEP_POLL;
2104
2105 NCR5380_setup(instance);
2106
2107 while (1) {
2108 tmp = NCR5380_read(STATUS_REG);
2109 /* We only have a valid SCSI phase when REQ is asserted */
2110 if (tmp & SR_REQ) {
2111 phase = (tmp & PHASE_MASK);
2112 if (phase != old_phase) {
2113 old_phase = phase;
2114 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance);
2115 }
2116 if (sink && (phase != PHASE_MSGOUT)) {
2117 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2118
2119 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
2120 while (NCR5380_read(STATUS_REG) & SR_REQ);
2121 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2122 sink = 0;
2123 continue;
2124 }
2125 switch (phase) {
2126 case PHASE_DATAIN:
2127 case PHASE_DATAOUT:
2128#if (NDEBUG & NDEBUG_NO_DATAOUT)
2129 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no);
2130 sink = 1;
2131 do_abort(instance);
2132 cmd->result = DID_ERROR << 16;
2133 cmd->done(cmd);
2134 return;
2135#endif
2136 /*
2137 * If there is no room left in the current buffer in the
2138 * scatter-gather list, move onto the next one.
2139 */
2140
2141 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2142 ++cmd->SCp.buffer;
2143 --cmd->SCp.buffers_residual;
2144 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2145 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+
2146 cmd->SCp.buffer->offset;
2147 dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual));
2148 }
2149 /*
2150 * The preferred transfer method is going to be
2151 * PSEUDO-DMA for systems that are strictly PIO,
2152 * since we can let the hardware do the handshaking.
2153 *
2154 * For this to work, we need to know the transfersize
2155 * ahead of time, since the pseudo-DMA code will sit
2156 * in an unconditional loop.
2157 */
2158
2159#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2160 /* KLL
2161 * PSEUDO_DMA is defined here. If this is the g_NCR5380
2162 * driver then it will always be defined, so the
2163 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
2164 * NCR5380 case. I think this is a fairly clean solution.
2165 * We supplement these 2 if's with the flag.
2166 */
2167#ifdef NCR5380_dma_xfer_len
2168 if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) {
2169#else
2170 transfersize = cmd->transfersize;
2171
2172#ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */
2173 if (transfersize > 512)
2174 transfersize = 512;
2175#endif /* LIMIT_TRANSFERSIZE */
2176
2177 if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) {
2178 /* Limit transfers to 32K, for xx400 & xx406
2179 * pseudoDMA that transfers in 128 bytes blocks. */
2180 if (transfersize > 32 * 1024)
2181 transfersize = 32 * 1024;
2182#endif
2183 len = transfersize;
2184 if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) {
2185 /*
2186 * If the watchdog timer fires, all future accesses to this
2187 * device will use the polled-IO.
2188 */
Jeff Garzik017560f2005-10-24 18:04:36 -04002189 scmd_printk(KERN_INFO, cmd,
2190 "switching to slow handshake\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002191 cmd->device->borken = 1;
2192 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2193 sink = 1;
2194 do_abort(instance);
2195 cmd->result = DID_ERROR << 16;
2196 cmd->done(cmd);
2197 /* XXX - need to source or sink data here, as appropriate */
2198 } else
2199 cmd->SCp.this_residual -= transfersize - len;
2200 } else
2201#endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */
2202 NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **)
2203 &cmd->SCp.ptr);
2204 break;
2205 case PHASE_MSGIN:
2206 len = 1;
2207 data = &tmp;
2208 NCR5380_transfer_pio(instance, &phase, &len, &data);
2209 cmd->SCp.Message = tmp;
2210
2211 switch (tmp) {
2212 /*
2213 * Linking lets us reduce the time required to get the
2214 * next command out to the device, hopefully this will
2215 * mean we don't waste another revolution due to the delays
2216 * required by ARBITRATION and another SELECTION.
2217 *
2218 * In the current implementation proposal, low level drivers
2219 * merely have to start the next command, pointed to by
2220 * next_link, done() is called as with unlinked commands.
2221 */
2222#ifdef LINKED
2223 case LINKED_CMD_COMPLETE:
2224 case LINKED_FLG_CMD_COMPLETE:
2225 /* Accept message by clearing ACK */
2226 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2227 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun));
2228 /*
2229 * Sanity check : A linked command should only terminate with
2230 * one of these messages if there are more linked commands
2231 * available.
2232 */
2233 if (!cmd->next_link) {
2234 printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun);
2235 sink = 1;
2236 do_abort(instance);
2237 return;
2238 }
2239 initialize_SCp(cmd->next_link);
2240 /* The next command is still part of this process */
2241 cmd->next_link->tag = cmd->tag;
2242 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2243 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun));
2244 collect_stats(hostdata, cmd);
2245 cmd->scsi_done(cmd);
2246 cmd = hostdata->connected;
2247 break;
2248#endif /* def LINKED */
2249 case ABORT:
2250 case COMMAND_COMPLETE:
2251 /* Accept message by clearing ACK */
2252 sink = 1;
2253 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2254 hostdata->connected = NULL;
2255 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun));
2256 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2257
2258 /*
2259 * I'm not sure what the correct thing to do here is :
2260 *
2261 * If the command that just executed is NOT a request
2262 * sense, the obvious thing to do is to set the result
2263 * code to the values of the stored parameters.
2264 *
2265 * If it was a REQUEST SENSE command, we need some way
2266 * to differentiate between the failure code of the original
2267 * and the failure code of the REQUEST sense - the obvious
2268 * case is success, where we fall through and leave the result
2269 * code unchanged.
2270 *
2271 * The non-obvious place is where the REQUEST SENSE failed
2272 */
2273
2274 if (cmd->cmnd[0] != REQUEST_SENSE)
2275 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2276 else if (status_byte(cmd->SCp.Status) != GOOD)
2277 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2278
2279#ifdef AUTOSENSE
2280 if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2281 dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no));
2282 cmd->cmnd[0] = REQUEST_SENSE;
2283 cmd->cmnd[1] &= 0xe0;
2284 cmd->cmnd[2] = 0;
2285 cmd->cmnd[3] = 0;
2286 cmd->cmnd[4] = sizeof(cmd->sense_buffer);
2287 cmd->cmnd[5] = 0;
2288
2289 cmd->SCp.buffer = NULL;
2290 cmd->SCp.buffers_residual = 0;
2291 cmd->SCp.ptr = (char *) cmd->sense_buffer;
2292 cmd->SCp.this_residual = sizeof(cmd->sense_buffer);
2293
2294 LIST(cmd, hostdata->issue_queue);
2295 cmd->host_scribble = (unsigned char *)
2296 hostdata->issue_queue;
2297 hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2298 dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no));
2299 } else
2300#endif /* def AUTOSENSE */
2301 {
2302 collect_stats(hostdata, cmd);
2303 cmd->scsi_done(cmd);
2304 }
2305
2306 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2307 /*
2308 * Restore phase bits to 0 so an interrupted selection,
2309 * arbitration can resume.
2310 */
2311 NCR5380_write(TARGET_COMMAND_REG, 0);
2312
2313 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2314 barrier();
2315 return;
2316 case MESSAGE_REJECT:
2317 /* Accept message by clearing ACK */
2318 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2319 switch (hostdata->last_message) {
2320 case HEAD_OF_QUEUE_TAG:
2321 case ORDERED_QUEUE_TAG:
2322 case SIMPLE_QUEUE_TAG:
2323 cmd->device->simple_tags = 0;
2324 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2325 break;
2326 default:
2327 break;
2328 }
2329 case DISCONNECT:{
2330 /* Accept message by clearing ACK */
2331 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2332 cmd->device->disconnect = 1;
2333 LIST(cmd, hostdata->disconnected_queue);
2334 cmd->host_scribble = (unsigned char *)
2335 hostdata->disconnected_queue;
2336 hostdata->connected = NULL;
2337 hostdata->disconnected_queue = cmd;
2338 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d lun %d was moved from connected to" " the disconnected_queue\n", instance->host_no, cmd->device->id, cmd->device->lun));
2339 /*
2340 * Restore phase bits to 0 so an interrupted selection,
2341 * arbitration can resume.
2342 */
2343 NCR5380_write(TARGET_COMMAND_REG, 0);
2344
2345 /* Enable reselect interrupts */
2346 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2347 /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/
2348 /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */
2349 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2350 barrier();
2351 return;
2352 }
2353 /*
2354 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2355 * operation, in violation of the SCSI spec so we can safely
2356 * ignore SAVE/RESTORE pointers calls.
2357 *
2358 * Unfortunately, some disks violate the SCSI spec and
2359 * don't issue the required SAVE_POINTERS message before
2360 * disconnecting, and we have to break spec to remain
2361 * compatible.
2362 */
2363 case SAVE_POINTERS:
2364 case RESTORE_POINTERS:
2365 /* Accept message by clearing ACK */
2366 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2367 break;
2368 case EXTENDED_MESSAGE:
2369/*
2370 * Extended messages are sent in the following format :
2371 * Byte
2372 * 0 EXTENDED_MESSAGE == 1
2373 * 1 length (includes one byte for code, doesn't
2374 * include first two bytes)
2375 * 2 code
2376 * 3..length+1 arguments
2377 *
2378 * Start the extended message buffer with the EXTENDED_MESSAGE
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002379 * byte, since spi_print_msg() wants the whole thing.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002380 */
2381 extended_msg[0] = EXTENDED_MESSAGE;
2382 /* Accept first byte by clearing ACK */
2383 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2384 dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no));
2385
2386 len = 2;
2387 data = extended_msg + 1;
2388 phase = PHASE_MSGIN;
2389 NCR5380_transfer_pio(instance, &phase, &len, &data);
2390
2391 dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2]));
2392
2393 if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) {
2394 /* Accept third byte by clearing ACK */
2395 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2396 len = extended_msg[1] - 1;
2397 data = extended_msg + 3;
2398 phase = PHASE_MSGIN;
2399
2400 NCR5380_transfer_pio(instance, &phase, &len, &data);
2401 dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len));
2402
2403 switch (extended_msg[2]) {
2404 case EXTENDED_SDTR:
2405 case EXTENDED_WDTR:
2406 case EXTENDED_MODIFY_DATA_POINTER:
2407 case EXTENDED_EXTENDED_IDENTIFY:
2408 tmp = 0;
2409 }
2410 } else if (len) {
2411 printk("scsi%d: error receiving extended message\n", instance->host_no);
2412 tmp = 0;
2413 } else {
2414 printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]);
2415 tmp = 0;
2416 }
2417 /* Fall through to reject message */
2418
2419 /*
2420 * If we get something weird that we aren't expecting,
2421 * reject it.
2422 */
2423 default:
2424 if (!tmp) {
2425 printk("scsi%d: rejecting message ", instance->host_no);
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002426 spi_print_msg(extended_msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002427 printk("\n");
2428 } else if (tmp != EXTENDED_MESSAGE)
Jeff Garzik017560f2005-10-24 18:04:36 -04002429 scmd_printk(KERN_INFO, cmd,
2430 "rejecting unknown message %02x\n",tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002431 else
Jeff Garzik017560f2005-10-24 18:04:36 -04002432 scmd_printk(KERN_INFO, cmd,
2433 "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002434
2435 msgout = MESSAGE_REJECT;
2436 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2437 break;
2438 } /* switch (tmp) */
2439 break;
2440 case PHASE_MSGOUT:
2441 len = 1;
2442 data = &msgout;
2443 hostdata->last_message = msgout;
2444 NCR5380_transfer_pio(instance, &phase, &len, &data);
2445 if (msgout == ABORT) {
2446 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2447 hostdata->connected = NULL;
2448 cmd->result = DID_ERROR << 16;
2449 collect_stats(hostdata, cmd);
2450 cmd->scsi_done(cmd);
2451 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2452 return;
2453 }
2454 msgout = NOP;
2455 break;
2456 case PHASE_CMDOUT:
2457 len = cmd->cmd_len;
2458 data = cmd->cmnd;
2459 /*
2460 * XXX for performance reasons, on machines with a
2461 * PSEUDO-DMA architecture we should probably
2462 * use the dma transfer function.
2463 */
2464 NCR5380_transfer_pio(instance, &phase, &len, &data);
2465 if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) {
2466 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
2467 dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
2468 return;
2469 }
2470 break;
2471 case PHASE_STATIN:
2472 len = 1;
2473 data = &tmp;
2474 NCR5380_transfer_pio(instance, &phase, &len, &data);
2475 cmd->SCp.Status = tmp;
2476 break;
2477 default:
2478 printk("scsi%d : unknown phase\n", instance->host_no);
2479 NCR5380_dprint(NDEBUG_ALL, instance);
2480 } /* switch(phase) */
2481 } /* if (tmp * SR_REQ) */
2482 else {
2483 /* RvC: go to sleep if polling time expired
2484 */
2485 if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) {
2486 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
2487 dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
2488 return;
2489 }
2490 }
2491 } /* while (1) */
2492}
2493
2494/*
2495 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2496 *
2497 * Purpose : does reselection, initializing the instance->connected
2498 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2499 * nexus has been reestablished,
2500 *
2501 * Inputs : instance - this instance of the NCR5380.
2502 *
2503 * Locks: io_request_lock held by caller if IRQ driven
2504 */
2505
2506static void NCR5380_reselect(struct Scsi_Host *instance) {
2507 NCR5380_local_declare();
2508 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
2509 instance->hostdata;
2510 unsigned char target_mask;
2511 unsigned char lun, phase;
2512 int len;
2513 unsigned char msg[3];
2514 unsigned char *data;
2515 Scsi_Cmnd *tmp = NULL, *prev;
2516 int abort = 0;
2517 NCR5380_setup(instance);
2518
2519 /*
2520 * Disable arbitration, etc. since the host adapter obviously
2521 * lost, and tell an interrupted NCR5380_select() to restart.
2522 */
2523
2524 NCR5380_write(MODE_REG, MR_BASE);
2525 hostdata->restart_select = 1;
2526
2527 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2528 dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no));
2529
2530 /*
2531 * At this point, we have detected that our SCSI ID is on the bus,
2532 * SEL is true and BSY was false for at least one bus settle delay
2533 * (400 ns).
2534 *
2535 * We must assert BSY ourselves, until the target drops the SEL
2536 * signal.
2537 */
2538
2539 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2540
2541 /* FIXME: timeout too long, must fail to workqueue */
2542 if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0)
2543 abort = 1;
2544
2545 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2546
2547 /*
2548 * Wait for target to go into MSGIN.
2549 * FIXME: timeout needed and fail to work queeu
2550 */
2551
2552 if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ))
2553 abort = 1;
2554
2555 len = 1;
2556 data = msg;
2557 phase = PHASE_MSGIN;
2558 NCR5380_transfer_pio(instance, &phase, &len, &data);
2559
2560 if (!(msg[0] & 0x80)) {
2561 printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no);
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002562 spi_print_msg(msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002563 abort = 1;
2564 } else {
2565 /* Accept message by clearing ACK */
2566 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2567 lun = (msg[0] & 0x07);
2568
2569 /*
2570 * We need to add code for SCSI-II to track which devices have
2571 * I_T_L_Q nexuses established, and which have simple I_T_L
2572 * nexuses so we can chose to do additional data transfer.
2573 */
2574
2575 /*
2576 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2577 * just reestablished, and remove it from the disconnected queue.
2578 */
2579
2580
2581 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
2582 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2583 ) {
2584 if (prev) {
2585 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
2586 prev->host_scribble = tmp->host_scribble;
2587 } else {
2588 REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble);
2589 hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble;
2590 }
2591 tmp->host_scribble = NULL;
2592 break;
2593 }
2594 if (!tmp) {
2595 printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun);
2596 /*
2597 * Since we have an established nexus that we can't do anything with,
2598 * we must abort it.
2599 */
2600 abort = 1;
2601 }
2602 }
2603
2604 if (abort) {
2605 do_abort(instance);
2606 } else {
2607 hostdata->connected = tmp;
2608 dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag));
2609 }
2610}
2611
2612/*
2613 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
2614 *
2615 * Purpose : called by interrupt handler when DMA finishes or a phase
2616 * mismatch occurs (which would finish the DMA transfer).
2617 *
2618 * Inputs : instance - this instance of the NCR5380.
2619 *
2620 * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L
2621 * nexus has been reestablished, on failure NULL is returned.
2622 */
2623
2624#ifdef REAL_DMA
2625static void NCR5380_dma_complete(NCR5380_instance * instance) {
2626 NCR5380_local_declare();
2627 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata * instance->hostdata);
2628 int transferred;
2629 NCR5380_setup(instance);
2630
2631 /*
2632 * XXX this might not be right.
2633 *
2634 * Wait for final byte to transfer, ie wait for ACK to go false.
2635 *
2636 * We should use the Last Byte Sent bit, unfortunately this is
2637 * not available on the 5380/5381 (only the various CMOS chips)
2638 *
2639 * FIXME: timeout, and need to handle long timeout/irq case
2640 */
2641
2642 NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ);
2643
2644 NCR5380_write(MODE_REG, MR_BASE);
2645 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2646
2647 /*
2648 * The only places we should see a phase mismatch and have to send
2649 * data from the same set of pointers will be the data transfer
2650 * phases. So, residual, requested length are only important here.
2651 */
2652
2653 if (!(hostdata->connected->SCp.phase & SR_CD)) {
2654 transferred = instance->dmalen - NCR5380_dma_residual();
2655 hostdata->connected->SCp.this_residual -= transferred;
2656 hostdata->connected->SCp.ptr += transferred;
2657 }
2658}
2659#endif /* def REAL_DMA */
2660
2661/*
2662 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2663 *
2664 * Purpose : abort a command
2665 *
2666 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2667 * host byte of the result field to, if zero DID_ABORTED is
2668 * used.
2669 *
2670 * Returns : 0 - success, -1 on failure.
2671 *
2672 * XXX - there is no way to abort the command that is currently
2673 * connected, you have to wait for it to complete. If this is
2674 * a problem, we could implement longjmp() / setjmp(), setjmp()
2675 * called where the loop started in NCR5380_main().
2676 *
2677 * Locks: host lock taken by caller
2678 */
2679
2680static int NCR5380_abort(Scsi_Cmnd * cmd) {
2681 NCR5380_local_declare();
2682 struct Scsi_Host *instance = cmd->device->host;
2683 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
2684 Scsi_Cmnd *tmp, **prev;
2685
2686 printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no);
db9dff32005-04-03 14:53:59 -05002687 scsi_print_command(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002688
2689 NCR5380_print_status(instance);
2690
2691 NCR5380_setup(instance);
2692
2693 dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no));
2694 dprintk(NDEBUG_ABORT, (" basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG)));
2695
2696#if 0
2697/*
2698 * Case 1 : If the command is the currently executing command,
2699 * we'll set the aborted flag and return control so that
2700 * information transfer routine can exit cleanly.
2701 */
2702
2703 if (hostdata->connected == cmd) {
2704 dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no));
2705 hostdata->aborted = 1;
2706/*
2707 * We should perform BSY checking, and make sure we haven't slipped
2708 * into BUS FREE.
2709 */
2710
2711 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN);
2712/*
2713 * Since we can't change phases until we've completed the current
2714 * handshake, we have to source or sink a byte of data if the current
2715 * phase is not MSGOUT.
2716 */
2717
2718/*
2719 * Return control to the executing NCR drive so we can clear the
2720 * aborted flag and get back into our main loop.
2721 */
2722
2723 return 0;
2724 }
2725#endif
2726
2727/*
2728 * Case 2 : If the command hasn't been issued yet, we simply remove it
2729 * from the issue queue.
2730 */
2731
2732 dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no));
2733 for (prev = (Scsi_Cmnd **) & (hostdata->issue_queue), tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble)
2734 if (cmd == tmp) {
2735 REMOVE(5, *prev, tmp, tmp->host_scribble);
2736 (*prev) = (Scsi_Cmnd *) tmp->host_scribble;
2737 tmp->host_scribble = NULL;
2738 tmp->result = DID_ABORT << 16;
2739 dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no));
2740 tmp->done(tmp);
2741 return SUCCESS;
2742 }
2743#if (NDEBUG & NDEBUG_ABORT)
2744 /* KLL */
2745 else if (prev == tmp)
2746 printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no);
2747#endif
2748
2749/*
2750 * Case 3 : If any commands are connected, we're going to fail the abort
2751 * and let the high level SCSI driver retry at a later time or
2752 * issue a reset.
2753 *
2754 * Timeouts, and therefore aborted commands, will be highly unlikely
2755 * and handling them cleanly in this situation would make the common
2756 * case of noresets less efficient, and would pollute our code. So,
2757 * we fail.
2758 */
2759
2760 if (hostdata->connected) {
2761 dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no));
2762 return FAILED;
2763 }
2764/*
2765 * Case 4: If the command is currently disconnected from the bus, and
2766 * there are no connected commands, we reconnect the I_T_L or
2767 * I_T_L_Q nexus associated with it, go into message out, and send
2768 * an abort message.
2769 *
2770 * This case is especially ugly. In order to reestablish the nexus, we
2771 * need to call NCR5380_select(). The easiest way to implement this
2772 * function was to abort if the bus was busy, and let the interrupt
2773 * handler triggered on the SEL for reselect take care of lost arbitrations
2774 * where necessary, meaning interrupts need to be enabled.
2775 *
2776 * When interrupts are enabled, the queues may change - so we
2777 * can't remove it from the disconnected queue before selecting it
2778 * because that could cause a failure in hashing the nexus if that
2779 * device reselected.
2780 *
2781 * Since the queues may change, we can't use the pointers from when we
2782 * first locate it.
2783 *
2784 * So, we must first locate the command, and if NCR5380_select()
2785 * succeeds, then issue the abort, relocate the command and remove
2786 * it from the disconnected queue.
2787 */
2788
2789 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble)
2790 if (cmd == tmp) {
2791 dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no));
2792
2793 if (NCR5380_select(instance, cmd, (int) cmd->tag))
2794 return FAILED;
2795 dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no));
2796
2797 do_abort(instance);
2798
2799 for (prev = (Scsi_Cmnd **) & (hostdata->disconnected_queue), tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble)
2800 if (cmd == tmp) {
2801 REMOVE(5, *prev, tmp, tmp->host_scribble);
2802 *prev = (Scsi_Cmnd *) tmp->host_scribble;
2803 tmp->host_scribble = NULL;
2804 tmp->result = DID_ABORT << 16;
2805 tmp->done(tmp);
2806 return SUCCESS;
2807 }
2808 }
2809/*
2810 * Case 5 : If we reached this point, the command was not found in any of
2811 * the queues.
2812 *
2813 * We probably reached this point because of an unlikely race condition
2814 * between the command completing successfully and the abortion code,
2815 * so we won't panic, but we will notify the user in case something really
2816 * broke.
2817 */
2818 printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n"
2819 " before abortion\n", instance->host_no);
2820 return FAILED;
2821}
2822
2823
2824/*
2825 * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd)
2826 *
2827 * Purpose : reset the SCSI bus.
2828 *
2829 * Returns : SUCCESS
2830 *
2831 * Locks: host lock taken by caller
2832 */
2833
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04002834static int NCR5380_bus_reset(Scsi_Cmnd * cmd)
2835{
2836 struct Scsi_Host *instance = cmd->device->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002837
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04002838 NCR5380_local_declare();
2839 NCR5380_setup(instance);
2840 NCR5380_print_status(instance);
2841
2842 spin_lock_irq(instance->host_lock);
2843 do_reset(instance);
2844 spin_unlock_irq(instance->host_lock);
2845
Linus Torvalds1da177e2005-04-16 15:20:36 -07002846 return SUCCESS;
2847}