blob: bb3cb33605417aa3f4b23dd4dc6216b744ebc2ad [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
David Howellsc4028952006-11-22 14:57:56 +0000852 INIT_DELAYED_WORK(&hostdata->coroutine, NCR5380_main);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853
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 */
David Howellsc4028952006-11-22 14:57:56 +00001019 schedule_delayed_work(&hostdata->coroutine, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 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
David Howellsc4028952006-11-22 14:57:56 +00001036static void NCR5380_main(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037{
David Howellsc4028952006-11-22 14:57:56 +00001038 struct NCR5380_hostdata *hostdata =
1039 container_of(work, struct NCR5380_hostdata, coroutine.work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 struct Scsi_Host *instance = hostdata->host;
1041 Scsi_Cmnd *tmp, *prev;
1042 int done;
1043
1044 spin_lock_irq(instance->host_lock);
1045 do {
1046 /* Lock held here */
1047 done = 1;
1048 if (!hostdata->connected && !hostdata->selecting) {
1049 dprintk(NDEBUG_MAIN, ("scsi%d : not connected\n", instance->host_no));
1050 /*
1051 * Search through the issue_queue for a command destined
1052 * for a target that's not busy.
1053 */
1054 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
1055 {
1056 if (prev != tmp)
1057 dprintk(NDEBUG_LISTS, ("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun));
1058 /* When we find one, remove it from the issue queue. */
1059 if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) {
1060 if (prev) {
1061 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
1062 prev->host_scribble = tmp->host_scribble;
1063 } else {
1064 REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble);
1065 hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble;
1066 }
1067 tmp->host_scribble = NULL;
1068
1069 /*
1070 * Attempt to establish an I_T_L nexus here.
1071 * On success, instance->hostdata->connected is set.
1072 * On failure, we must add the command back to the
1073 * issue queue so we can keep trying.
1074 */
1075 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));
1076
1077 /*
1078 * A successful selection is defined as one that
1079 * leaves us with the command connected and
1080 * in hostdata->connected, OR has terminated the
1081 * command.
1082 *
1083 * With successful commands, we fall through
1084 * and see if we can do an information transfer,
1085 * with failures we will restart.
1086 */
1087 hostdata->selecting = NULL;
1088 /* RvC: have to preset this to indicate a new command is being performed */
1089
1090 if (!NCR5380_select(instance, tmp,
1091 /*
1092 * REQUEST SENSE commands are issued without tagged
1093 * queueing, even on SCSI-II devices because the
1094 * contingent allegiance condition exists for the
1095 * entire unit.
1096 */
1097 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
1098 break;
1099 } else {
1100 LIST(tmp, hostdata->issue_queue);
1101 tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1102 hostdata->issue_queue = tmp;
1103 done = 0;
1104 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no));
1105 }
1106 /* lock held here still */
1107 } /* if target/lun is not busy */
1108 } /* for */
1109 /* exited locked */
1110 } /* if (!hostdata->connected) */
1111 if (hostdata->selecting) {
1112 tmp = (Scsi_Cmnd *) hostdata->selecting;
1113 /* Selection will drop and retake the lock */
1114 if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
1115 /* Ok ?? */
1116 } else {
1117 /* RvC: device failed, so we wait a long time
1118 this is needed for Mustek scanners, that
1119 do not respond to commands immediately
1120 after a scan */
1121 printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id);
1122 LIST(tmp, hostdata->issue_queue);
1123 tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1124 hostdata->issue_queue = tmp;
1125 NCR5380_set_timer(hostdata, USLEEP_WAITLONG);
1126 }
1127 } /* if hostdata->selecting */
1128 if (hostdata->connected
1129#ifdef REAL_DMA
1130 && !hostdata->dmalen
1131#endif
1132 && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies))
1133 ) {
1134 dprintk(NDEBUG_MAIN, ("scsi%d : main() : performing information transfer\n", instance->host_no));
1135 NCR5380_information_transfer(instance);
1136 dprintk(NDEBUG_MAIN, ("scsi%d : main() : done set false\n", instance->host_no));
1137 done = 0;
1138 } else
1139 break;
1140 } while (!done);
1141
1142 spin_unlock_irq(instance->host_lock);
1143}
1144
1145#ifndef DONT_USE_INTR
1146
1147/**
1148 * NCR5380_intr - generic NCR5380 irq handler
1149 * @irq: interrupt number
1150 * @dev_id: device info
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 *
1152 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1153 * from the disconnected queue, and restarting NCR5380_main()
1154 * as required.
1155 *
1156 * Locks: takes the needed instance locks
1157 */
1158
David Howells7d12e782006-10-05 14:55:46 +01001159static irqreturn_t NCR5380_intr(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160{
1161 NCR5380_local_declare();
1162 struct Scsi_Host *instance = (struct Scsi_Host *)dev_id;
1163 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1164 int done;
1165 unsigned char basr;
1166 unsigned long flags;
1167
1168 dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n", irq));
1169
1170 do {
1171 done = 1;
1172 spin_lock_irqsave(instance->host_lock, flags);
1173 /* Look for pending interrupts */
1174 NCR5380_setup(instance);
1175 basr = NCR5380_read(BUS_AND_STATUS_REG);
1176 /* XXX dispatch to appropriate routine if found and done=0 */
1177 if (basr & BASR_IRQ) {
1178 NCR5380_dprint(NDEBUG_INTR, instance);
1179 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1180 done = 0;
1181 dprintk(NDEBUG_INTR, ("scsi%d : SEL interrupt\n", instance->host_no));
1182 NCR5380_reselect(instance);
1183 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1184 } else if (basr & BASR_PARITY_ERROR) {
1185 dprintk(NDEBUG_INTR, ("scsi%d : PARITY interrupt\n", instance->host_no));
1186 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1187 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1188 dprintk(NDEBUG_INTR, ("scsi%d : RESET interrupt\n", instance->host_no));
1189 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1190 } else {
1191#if defined(REAL_DMA)
1192 /*
1193 * We should only get PHASE MISMATCH and EOP interrupts
1194 * if we have DMA enabled, so do a sanity check based on
1195 * the current setting of the MODE register.
1196 */
1197
1198 if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) {
1199 int transfered;
1200
1201 if (!hostdata->connected)
1202 panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno);
1203
1204 transfered = (hostdata->dmalen - NCR5380_dma_residual(instance));
1205 hostdata->connected->SCp.this_residual -= transferred;
1206 hostdata->connected->SCp.ptr += transferred;
1207 hostdata->dmalen = 0;
1208
1209 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1210
1211 /* FIXME: we need to poll briefly then defer a workqueue task ! */
1212 NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ);
1213
1214 NCR5380_write(MODE_REG, MR_BASE);
1215 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1216 }
1217#else
1218 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)));
1219 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1220#endif
1221 }
1222 } /* if BASR_IRQ */
1223 spin_unlock_irqrestore(instance->host_lock, flags);
1224 if(!done)
David Howellsc4028952006-11-22 14:57:56 +00001225 schedule_delayed_work(&hostdata->coroutine, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 } while (!done);
1227 return IRQ_HANDLED;
1228}
1229
1230#endif
1231
1232/**
1233 * collect_stats - collect stats on a scsi command
1234 * @hostdata: adapter
1235 * @cmd: command being issued
1236 *
1237 * Update the statistical data by parsing the command in question
1238 */
1239
1240static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd)
1241{
1242#ifdef NCR5380_STATS
1243 switch (cmd->cmnd[0]) {
1244 case WRITE:
1245 case WRITE_6:
1246 case WRITE_10:
Jeff Garzik422c0d62005-10-24 18:05:09 -04001247 hostdata->time_write[scmd_id(cmd)] += (jiffies - hostdata->timebase);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 hostdata->pendingw--;
1249 break;
1250 case READ:
1251 case READ_6:
1252 case READ_10:
Jeff Garzik422c0d62005-10-24 18:05:09 -04001253 hostdata->time_read[scmd_id(cmd)] += (jiffies - hostdata->timebase);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 hostdata->pendingr--;
1255 break;
1256 }
1257#endif
1258}
1259
1260
1261/*
1262 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
1263 * int tag);
1264 *
1265 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1266 * including ARBITRATION, SELECTION, and initial message out for
1267 * IDENTIFY and queue messages.
1268 *
1269 * Inputs : instance - instantiation of the 5380 driver on which this
1270 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1271 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1272 * the command that is presently connected.
1273 *
1274 * Returns : -1 if selection could not execute for some reason,
1275 * 0 if selection succeeded or failed because the target
1276 * did not respond.
1277 *
1278 * Side effects :
1279 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1280 * with registers as they should have been on entry - ie
1281 * SELECT_ENABLE will be set appropriately, the NCR5380
1282 * will cease to drive any SCSI bus signals.
1283 *
1284 * If successful : I_T_L or I_T_L_Q nexus will be established,
1285 * instance->connected will be set to cmd.
1286 * SELECT interrupt will be disabled.
1287 *
1288 * If failed (no target) : cmd->scsi_done() will be called, and the
1289 * cmd->result host byte set to DID_BAD_TARGET.
1290 *
1291 * Locks: caller holds hostdata lock in IRQ mode
1292 */
1293
1294static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag)
1295{
1296 NCR5380_local_declare();
1297 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1298 unsigned char tmp[3], phase;
1299 unsigned char *data;
1300 int len;
1301 unsigned long timeout;
1302 unsigned char value;
1303 int err;
1304 NCR5380_setup(instance);
1305
1306 if (hostdata->selecting)
1307 goto part2;
1308
1309 hostdata->restart_select = 0;
1310
1311 NCR5380_dprint(NDEBUG_ARBITRATION, instance);
1312 dprintk(NDEBUG_ARBITRATION, ("scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id));
1313
1314 /*
1315 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1316 * data bus during SELECTION.
1317 */
1318
1319 NCR5380_write(TARGET_COMMAND_REG, 0);
1320
1321 /*
1322 * Start arbitration.
1323 */
1324
1325 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1326 NCR5380_write(MODE_REG, MR_ARBITRATE);
1327
1328
1329 /* We can be relaxed here, interrupts are on, we are
1330 in workqueue context, the birds are singing in the trees */
1331 spin_unlock_irq(instance->host_lock);
1332 err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ);
1333 spin_lock_irq(instance->host_lock);
1334 if (err < 0) {
1335 printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__);
1336 NCR5380_write(MODE_REG, MR_BASE);
1337 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1338 goto failed;
1339 }
1340
1341 dprintk(NDEBUG_ARBITRATION, ("scsi%d : arbitration complete\n", instance->host_no));
1342
1343 /*
1344 * The arbitration delay is 2.2us, but this is a minimum and there is
1345 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1346 * the integral nature of udelay().
1347 *
1348 */
1349
1350 udelay(3);
1351
1352 /* Check for lost arbitration */
1353 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)) {
1354 NCR5380_write(MODE_REG, MR_BASE);
1355 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no));
1356 goto failed;
1357 }
1358 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL);
1359
1360 if (!(hostdata->flags & FLAG_DTC3181E) &&
1361 /* RvC: DTC3181E has some trouble with this
1362 * so we simply removed it. Seems to work with
1363 * only Mustek scanner attached
1364 */
1365 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
1366 NCR5380_write(MODE_REG, MR_BASE);
1367 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1368 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no));
1369 goto failed;
1370 }
1371 /*
1372 * Again, bus clear + bus settle time is 1.2us, however, this is
1373 * a minimum so we'll udelay ceil(1.2)
1374 */
1375
1376 udelay(2);
1377
1378 dprintk(NDEBUG_ARBITRATION, ("scsi%d : won arbitration\n", instance->host_no));
1379
1380 /*
1381 * Now that we have won arbitration, start Selection process, asserting
1382 * the host and target ID's on the SCSI bus.
1383 */
1384
Jeff Garzik422c0d62005-10-24 18:05:09 -04001385 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd))));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386
1387 /*
1388 * Raise ATN while SEL is true before BSY goes false from arbitration,
1389 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1390 * phase immediately after selection.
1391 */
1392
1393 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1394 NCR5380_write(MODE_REG, MR_BASE);
1395
1396 /*
1397 * Reselect interrupts must be turned off prior to the dropping of BSY,
1398 * otherwise we will trigger an interrupt.
1399 */
1400 NCR5380_write(SELECT_ENABLE_REG, 0);
1401
1402 /*
1403 * The initiator shall then wait at least two deskew delays and release
1404 * the BSY signal.
1405 */
1406 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1407
1408 /* Reset BSY */
1409 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1410
1411 /*
1412 * Something weird happens when we cease to drive BSY - looks
1413 * like the board/chip is letting us do another read before the
1414 * appropriate propagation delay has expired, and we're confusing
1415 * a BSY signal from ourselves as the target's response to SELECTION.
1416 *
1417 * A small delay (the 'C++' frontend breaks the pipeline with an
1418 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1419 * tighter 'C' code breaks and requires this) solves the problem -
1420 * the 1 us delay is arbitrary, and only used because this delay will
1421 * be the same on other platforms and since it works here, it should
1422 * work there.
1423 *
1424 * wingel suggests that this could be due to failing to wait
1425 * one deskew delay.
1426 */
1427
1428 udelay(1);
1429
Jeff Garzik422c0d62005-10-24 18:05:09 -04001430 dprintk(NDEBUG_SELECTION, ("scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431
1432 /*
1433 * The SCSI specification calls for a 250 ms timeout for the actual
1434 * selection.
1435 */
1436
1437 timeout = jiffies + (250 * HZ / 1000);
1438
1439 /*
1440 * XXX very interesting - we're seeing a bounce where the BSY we
1441 * asserted is being reflected / still asserted (propagation delay?)
1442 * and it's detecting as true. Sigh.
1443 */
1444
1445 hostdata->select_time = 0; /* we count the clock ticks at which we polled */
1446 hostdata->selecting = cmd;
1447
1448part2:
1449 /* RvC: here we enter after a sleeping period, or immediately after
1450 execution of part 1
1451 we poll only once ech clock tick */
1452 value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO);
1453
1454 if (!value && (hostdata->select_time < HZ/4)) {
1455 /* RvC: we still must wait for a device response */
1456 hostdata->select_time++; /* after 25 ticks the device has failed */
1457 NCR5380_set_timer(hostdata, 1);
1458 return 0; /* RvC: we return here with hostdata->selecting set,
1459 to go to sleep */
1460 }
1461
1462 hostdata->selecting = NULL;/* clear this pointer, because we passed the
1463 waiting period */
1464 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1465 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1466 NCR5380_reselect(instance);
1467 printk("scsi%d : reselection after won arbitration?\n", instance->host_no);
1468 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1469 return -1;
1470 }
1471 /*
1472 * No less than two deskew delays after the initiator detects the
1473 * BSY signal is true, it shall release the SEL signal and may
1474 * change the DATA BUS. -wingel
1475 */
1476
1477 udelay(1);
1478
1479 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1480
1481 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1482 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
Jeff Garzik422c0d62005-10-24 18:05:09 -04001483 if (hostdata->targets_present & (1 << scmd_id(cmd))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484 printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no);
1485 if (hostdata->restart_select)
1486 printk(KERN_DEBUG "\trestart select\n");
1487 NCR5380_dprint(NDEBUG_SELECTION, instance);
1488 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1489 return -1;
1490 }
1491 cmd->result = DID_BAD_TARGET << 16;
1492 collect_stats(hostdata, cmd);
1493 cmd->scsi_done(cmd);
1494 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1495 dprintk(NDEBUG_SELECTION, ("scsi%d : target did not respond within 250ms\n", instance->host_no));
1496 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1497 return 0;
1498 }
Jeff Garzik422c0d62005-10-24 18:05:09 -04001499 hostdata->targets_present |= (1 << scmd_id(cmd));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500
1501 /*
1502 * Since we followed the SCSI spec, and raised ATN while SEL
1503 * was true but before BSY was false during selection, the information
1504 * transfer phase should be a MESSAGE OUT phase so that we can send the
1505 * IDENTIFY message.
1506 *
1507 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1508 * message (2 bytes) with a tag ID that we increment with every command
1509 * until it wraps back to 0.
1510 *
1511 * XXX - it turns out that there are some broken SCSI-II devices,
1512 * which claim to support tagged queuing but fail when more than
1513 * some number of commands are issued at once.
1514 */
1515
1516 /* Wait for start of REQ/ACK handshake */
1517
1518 spin_unlock_irq(instance->host_lock);
1519 err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ);
1520 spin_lock_irq(instance->host_lock);
1521
1522 if(err) {
1523 printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__);
1524 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1525 goto failed;
1526 }
1527
1528 dprintk(NDEBUG_SELECTION, ("scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id));
1529 tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun);
1530
1531 len = 1;
1532 cmd->tag = 0;
1533
1534 /* Send message(s) */
1535 data = tmp;
1536 phase = PHASE_MSGOUT;
1537 NCR5380_transfer_pio(instance, &phase, &len, &data);
1538 dprintk(NDEBUG_SELECTION, ("scsi%d : nexus established.\n", instance->host_no));
1539 /* XXX need to handle errors here */
1540 hostdata->connected = cmd;
1541 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1542
1543 if (cmd->SCp.ptr != (char *)cmd->sense_buffer) {
1544 initialize_SCp(cmd);
1545 }
1546
1547 return 0;
1548
1549 /* Selection failed */
1550failed:
1551 return -1;
1552
1553}
1554
1555/*
1556 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1557 * unsigned char *phase, int *count, unsigned char **data)
1558 *
1559 * Purpose : transfers data in given phase using polled I/O
1560 *
1561 * Inputs : instance - instance of driver, *phase - pointer to
1562 * what phase is expected, *count - pointer to number of
1563 * bytes to transfer, **data - pointer to data pointer.
1564 *
1565 * Returns : -1 when different phase is entered without transferring
1566 * maximum number of bytes, 0 if all bytes or transfered or exit
1567 * is in same phase.
1568 *
1569 * Also, *phase, *count, *data are modified in place.
1570 *
1571 * XXX Note : handling for bus free may be useful.
1572 */
1573
1574/*
1575 * Note : this code is not as quick as it could be, however it
1576 * IS 100% reliable, and for the actual data transfer where speed
1577 * counts, we will always do a pseudo DMA or DMA transfer.
1578 */
1579
1580static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1581 NCR5380_local_declare();
1582 unsigned char p = *phase, tmp;
1583 int c = *count;
1584 unsigned char *d = *data;
1585 /*
1586 * RvC: some administrative data to process polling time
1587 */
1588 int break_allowed = 0;
1589 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1590 NCR5380_setup(instance);
1591
1592 if (!(p & SR_IO))
1593 dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c));
1594 else
1595 dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c));
1596
1597 /*
1598 * The NCR5380 chip will only drive the SCSI bus when the
1599 * phase specified in the appropriate bits of the TARGET COMMAND
1600 * REGISTER match the STATUS REGISTER
1601 */
1602
1603 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1604
1605 /* RvC: don't know if this is necessary, but other SCSI I/O is short
1606 * so breaks are not necessary there
1607 */
1608 if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) {
1609 break_allowed = 1;
1610 }
1611 do {
1612 /*
1613 * Wait for assertion of REQ, after which the phase bits will be
1614 * valid
1615 */
1616
1617 /* RvC: we simply poll once, after that we stop temporarily
1618 * and let the device buffer fill up
1619 * if breaking is not allowed, we keep polling as long as needed
1620 */
1621
1622 /* FIXME */
1623 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed);
1624 if (!(tmp & SR_REQ)) {
1625 /* timeout condition */
1626 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
1627 break;
1628 }
1629
1630 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no));
1631
1632 /* Check for phase mismatch */
1633 if ((tmp & PHASE_MASK) != p) {
1634 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no));
1635 NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance);
1636 break;
1637 }
1638 /* Do actual transfer from SCSI bus to / from memory */
1639 if (!(p & SR_IO))
1640 NCR5380_write(OUTPUT_DATA_REG, *d);
1641 else
1642 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1643
1644 ++d;
1645
1646 /*
1647 * The SCSI standard suggests that in MSGOUT phase, the initiator
1648 * should drop ATN on the last byte of the message phase
1649 * after REQ has been asserted for the handshake but before
1650 * the initiator raises ACK.
1651 */
1652
1653 if (!(p & SR_IO)) {
1654 if (!((p & SR_MSG) && c > 1)) {
1655 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1656 NCR5380_dprint(NDEBUG_PIO, instance);
1657 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1658 } else {
1659 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1660 NCR5380_dprint(NDEBUG_PIO, instance);
1661 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1662 }
1663 } else {
1664 NCR5380_dprint(NDEBUG_PIO, instance);
1665 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1666 }
1667
1668 /* FIXME - if this fails bus reset ?? */
1669 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ);
1670 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no));
1671
1672/*
1673 * We have several special cases to consider during REQ/ACK handshaking :
1674 * 1. We were in MSGOUT phase, and we are on the last byte of the
1675 * message. ATN must be dropped as ACK is dropped.
1676 *
1677 * 2. We are in a MSGIN phase, and we are on the last byte of the
1678 * message. We must exit with ACK asserted, so that the calling
1679 * code may raise ATN before dropping ACK to reject the message.
1680 *
1681 * 3. ACK and ATN are clear and the target may proceed as normal.
1682 */
1683 if (!(p == PHASE_MSGIN && c == 1)) {
1684 if (p == PHASE_MSGOUT && c > 1)
1685 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1686 else
1687 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1688 }
1689 } while (--c);
1690
1691 dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c));
1692
1693 *count = c;
1694 *data = d;
1695 tmp = NCR5380_read(STATUS_REG);
1696 if (tmp & SR_REQ)
1697 *phase = tmp & PHASE_MASK;
1698 else
1699 *phase = PHASE_UNKNOWN;
1700
1701 if (!c || (*phase == p))
1702 return 0;
1703 else
1704 return -1;
1705}
1706
1707/**
1708 * do_reset - issue a reset command
1709 * @host: adapter to reset
1710 *
1711 * Issue a reset sequence to the NCR5380 and try and get the bus
1712 * back into sane shape.
1713 *
1714 * Locks: caller holds queue lock
1715 */
1716
1717static void do_reset(struct Scsi_Host *host) {
1718 NCR5380_local_declare();
1719 NCR5380_setup(host);
1720
1721 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
1722 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
1723 udelay(25);
1724 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1725}
1726
1727/*
1728 * Function : do_abort (Scsi_Host *host)
1729 *
1730 * Purpose : abort the currently established nexus. Should only be
1731 * called from a routine which can drop into a
1732 *
1733 * Returns : 0 on success, -1 on failure.
1734 *
1735 * Locks: queue lock held by caller
1736 * FIXME: sort this out and get new_eh running
1737 */
1738
1739static int do_abort(struct Scsi_Host *host) {
1740 NCR5380_local_declare();
1741 unsigned char *msgptr, phase, tmp;
1742 int len;
1743 int rc;
1744 NCR5380_setup(host);
1745
1746
1747 /* Request message out phase */
1748 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1749
1750 /*
1751 * Wait for the target to indicate a valid phase by asserting
1752 * REQ. Once this happens, we'll have either a MSGOUT phase
1753 * and can immediately send the ABORT message, or we'll have some
1754 * other phase and will have to source/sink data.
1755 *
1756 * We really don't care what value was on the bus or what value
1757 * the target sees, so we just handshake.
1758 */
1759
1760 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ);
1761
1762 if(rc < 0)
1763 return -1;
1764
1765 tmp = (unsigned char)rc;
1766
1767 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1768
1769 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1770 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1771 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ);
1772 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1773 if(rc == -1)
1774 return -1;
1775 }
1776 tmp = ABORT;
1777 msgptr = &tmp;
1778 len = 1;
1779 phase = PHASE_MSGOUT;
1780 NCR5380_transfer_pio(host, &phase, &len, &msgptr);
1781
1782 /*
1783 * If we got here, and the command completed successfully,
1784 * we're about to go into bus free state.
1785 */
1786
1787 return len ? -1 : 0;
1788}
1789
1790#if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL)
1791/*
1792 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1793 * unsigned char *phase, int *count, unsigned char **data)
1794 *
1795 * Purpose : transfers data in given phase using either real
1796 * or pseudo DMA.
1797 *
1798 * Inputs : instance - instance of driver, *phase - pointer to
1799 * what phase is expected, *count - pointer to number of
1800 * bytes to transfer, **data - pointer to data pointer.
1801 *
1802 * Returns : -1 when different phase is entered without transferring
1803 * maximum number of bytes, 0 if all bytes or transfered or exit
1804 * is in same phase.
1805 *
1806 * Also, *phase, *count, *data are modified in place.
1807 *
1808 * Locks: io_request lock held by caller
1809 */
1810
1811
1812static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1813 NCR5380_local_declare();
1814 register int c = *count;
1815 register unsigned char p = *phase;
1816 register unsigned char *d = *data;
1817 unsigned char tmp;
1818 int foo;
1819#if defined(REAL_DMA_POLL)
1820 int cnt, toPIO;
1821 unsigned char saved_data = 0, overrun = 0, residue;
1822#endif
1823
1824 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1825
1826 NCR5380_setup(instance);
1827
1828 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1829 *phase = tmp;
1830 return -1;
1831 }
1832#if defined(REAL_DMA) || defined(REAL_DMA_POLL)
1833#ifdef READ_OVERRUNS
1834 if (p & SR_IO) {
1835 c -= 2;
1836 }
1837#endif
1838 dprintk(NDEBUG_DMA, ("scsi%d : initializing DMA channel %d for %s, %d bytes %s %0x\n", instance->host_no, instance->dma_channel, (p & SR_IO) ? "reading" : "writing", c, (p & SR_IO) ? "to" : "from", (unsigned) d));
1839 hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c);
1840#endif
1841
1842 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1843
1844#ifdef REAL_DMA
1845 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
1846#elif defined(REAL_DMA_POLL)
1847 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
1848#else
1849 /*
1850 * Note : on my sample board, watch-dog timeouts occurred when interrupts
1851 * were not disabled for the duration of a single DMA transfer, from
1852 * before the setting of DMA mode to after transfer of the last byte.
1853 */
1854
1855#if defined(PSEUDO_DMA) && defined(UNSAFE)
1856 spin_unlock_irq(instance->host_lock);
1857#endif
1858 /* KLL May need eop and parity in 53c400 */
1859 if (hostdata->flags & FLAG_NCR53C400)
1860 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR | MR_ENABLE_EOP_INTR | MR_DMA_MODE | MR_MONITOR_BSY);
1861 else
1862 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
1863#endif /* def REAL_DMA */
1864
1865 dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG)));
1866
1867 /*
1868 * On the PAS16 at least I/O recovery delays are not needed here.
1869 * Everyone else seems to want them.
1870 */
1871
1872 if (p & SR_IO) {
1873 io_recovery_delay(1);
1874 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1875 } else {
1876 io_recovery_delay(1);
1877 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1878 io_recovery_delay(1);
1879 NCR5380_write(START_DMA_SEND_REG, 0);
1880 io_recovery_delay(1);
1881 }
1882
1883#if defined(REAL_DMA_POLL)
1884 do {
1885 tmp = NCR5380_read(BUS_AND_STATUS_REG);
1886 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER)));
1887
1888/*
1889 At this point, either we've completed DMA, or we have a phase mismatch,
1890 or we've unexpectedly lost BUSY (which is a real error).
1891
1892 For write DMAs, we want to wait until the last byte has been
1893 transferred out over the bus before we turn off DMA mode. Alas, there
1894 seems to be no terribly good way of doing this on a 5380 under all
1895 conditions. For non-scatter-gather operations, we can wait until REQ
1896 and ACK both go false, or until a phase mismatch occurs. Gather-writes
1897 are nastier, since the device will be expecting more data than we
1898 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
1899 could test LAST BIT SENT to assure transfer (I imagine this is precisely
1900 why this signal was added to the newer chips) but on the older 538[01]
1901 this signal does not exist. The workaround for this lack is a watchdog;
1902 we bail out of the wait-loop after a modest amount of wait-time if
1903 the usual exit conditions are not met. Not a terribly clean or
1904 correct solution :-%
1905
1906 Reads are equally tricky due to a nasty characteristic of the NCR5380.
1907 If the chip is in DMA mode for an READ, it will respond to a target's
1908 REQ by latching the SCSI data into the INPUT DATA register and asserting
1909 ACK, even if it has _already_ been notified by the DMA controller that
1910 the current DMA transfer has completed! If the NCR5380 is then taken
1911 out of DMA mode, this already-acknowledged byte is lost.
1912
1913 This is not a problem for "one DMA transfer per command" reads, because
1914 the situation will never arise... either all of the data is DMA'ed
1915 properly, or the target switches to MESSAGE IN phase to signal a
1916 disconnection (either operation bringing the DMA to a clean halt).
1917 However, in order to handle scatter-reads, we must work around the
1918 problem. The chosen fix is to DMA N-2 bytes, then check for the
1919 condition before taking the NCR5380 out of DMA mode. One or two extra
1920 bytes are transferred via PIO as necessary to fill out the original
1921 request.
1922 */
1923
1924 if (p & SR_IO) {
1925#ifdef READ_OVERRUNS
1926 udelay(10);
1927 if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) {
1928 saved_data = NCR5380_read(INPUT_DATA_REGISTER);
1929 overrun = 1;
1930 }
1931#endif
1932 } else {
1933 int limit = 100;
1934 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) {
1935 if (!(tmp & BASR_PHASE_MATCH))
1936 break;
1937 if (--limit < 0)
1938 break;
1939 }
1940 }
1941
1942 dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG)));
1943
1944 NCR5380_write(MODE_REG, MR_BASE);
1945 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1946
1947 residue = NCR5380_dma_residual(instance);
1948 c -= residue;
1949 *count -= c;
1950 *data += c;
1951 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
1952
1953#ifdef READ_OVERRUNS
1954 if (*phase == p && (p & SR_IO) && residue == 0) {
1955 if (overrun) {
1956 dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n"));
1957 **data = saved_data;
1958 *data += 1;
1959 *count -= 1;
1960 cnt = toPIO = 1;
1961 } else {
1962 printk("No overrun??\n");
1963 cnt = toPIO = 2;
1964 }
1965 dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data));
1966 NCR5380_transfer_pio(instance, phase, &cnt, data);
1967 *count -= toPIO - cnt;
1968 }
1969#endif
1970
1971 dprintk(NDEBUG_DMA, ("Return with data ptr = 0x%X, count %d, last 0x%X, next 0x%X\n", *data, *count, *(*data + *count - 1), *(*data + *count)));
1972 return 0;
1973
1974#elif defined(REAL_DMA)
1975 return 0;
1976#else /* defined(REAL_DMA_POLL) */
1977 if (p & SR_IO) {
1978#ifdef DMA_WORKS_RIGHT
1979 foo = NCR5380_pread(instance, d, c);
1980#else
1981 int diff = 1;
1982 if (hostdata->flags & FLAG_NCR53C400) {
1983 diff = 0;
1984 }
1985 if (!(foo = NCR5380_pread(instance, d, c - diff))) {
1986 /*
1987 * We can't disable DMA mode after successfully transferring
1988 * what we plan to be the last byte, since that would open up
1989 * a race condition where if the target asserted REQ before
1990 * we got the DMA mode reset, the NCR5380 would have latched
1991 * an additional byte into the INPUT DATA register and we'd
1992 * have dropped it.
1993 *
1994 * The workaround was to transfer one fewer bytes than we
1995 * intended to with the pseudo-DMA read function, wait for
1996 * the chip to latch the last byte, read it, and then disable
1997 * pseudo-DMA mode.
1998 *
1999 * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
2000 * REQ is deasserted when ACK is asserted, and not reasserted
2001 * until ACK goes false. Since the NCR5380 won't lower ACK
2002 * until DACK is asserted, which won't happen unless we twiddle
2003 * the DMA port or we take the NCR5380 out of DMA mode, we
2004 * can guarantee that we won't handshake another extra
2005 * byte.
2006 */
2007
2008 if (!(hostdata->flags & FLAG_NCR53C400)) {
2009 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ));
2010 /* Wait for clean handshake */
2011 while (NCR5380_read(STATUS_REG) & SR_REQ);
2012 d[c - 1] = NCR5380_read(INPUT_DATA_REG);
2013 }
2014 }
2015#endif
2016 } else {
2017#ifdef DMA_WORKS_RIGHT
2018 foo = NCR5380_pwrite(instance, d, c);
2019#else
2020 int timeout;
2021 dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c));
2022 if (!(foo = NCR5380_pwrite(instance, d, c))) {
2023 /*
2024 * Wait for the last byte to be sent. If REQ is being asserted for
2025 * the byte we're interested, we'll ACK it and it will go false.
2026 */
2027 if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) {
2028 timeout = 20000;
2029 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH));
2030
2031 if (!timeout)
2032 dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no));
2033
2034 if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) {
2035 hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT;
2036 if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) {
2037 hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT;
2038 dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no));
2039 }
2040 }
2041 } else {
2042 dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n"));
2043 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT));
2044 dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n"));
2045 }
2046 }
2047#endif
2048 }
2049 NCR5380_write(MODE_REG, MR_BASE);
2050 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2051
2052 if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) {
2053 dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n"));
2054 if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) {
2055 dprintk(NDEBUG_C400_PWRITE, ("53C400w: got it, reading reset interrupt reg\n"));
2056 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
2057 } else {
2058 printk("53C400w: IRQ NOT THERE!\n");
2059 }
2060 }
2061 *data = d + c;
2062 *count = 0;
2063 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
2064#if defined(PSEUDO_DMA) && defined(UNSAFE)
2065 spin_lock_irq(instance->host_lock);
2066#endif /* defined(REAL_DMA_POLL) */
2067 return foo;
2068#endif /* def REAL_DMA */
2069}
2070#endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */
2071
2072/*
2073 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
2074 *
2075 * Purpose : run through the various SCSI phases and do as the target
2076 * directs us to. Operates on the currently connected command,
2077 * instance->connected.
2078 *
2079 * Inputs : instance, instance for which we are doing commands
2080 *
2081 * Side effects : SCSI things happen, the disconnected queue will be
2082 * modified if a command disconnects, *instance->connected will
2083 * change.
2084 *
2085 * XXX Note : we need to watch for bus free or a reset condition here
2086 * to recover from an unexpected bus free condition.
2087 *
2088 * Locks: io_request_lock held by caller in IRQ mode
2089 */
2090
2091static void NCR5380_information_transfer(struct Scsi_Host *instance) {
2092 NCR5380_local_declare();
2093 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata;
2094 unsigned char msgout = NOP;
2095 int sink = 0;
2096 int len;
2097#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2098 int transfersize;
2099#endif
2100 unsigned char *data;
2101 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
2102 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
2103 /* RvC: we need to set the end of the polling time */
2104 unsigned long poll_time = jiffies + USLEEP_POLL;
2105
2106 NCR5380_setup(instance);
2107
2108 while (1) {
2109 tmp = NCR5380_read(STATUS_REG);
2110 /* We only have a valid SCSI phase when REQ is asserted */
2111 if (tmp & SR_REQ) {
2112 phase = (tmp & PHASE_MASK);
2113 if (phase != old_phase) {
2114 old_phase = phase;
2115 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance);
2116 }
2117 if (sink && (phase != PHASE_MSGOUT)) {
2118 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2119
2120 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
2121 while (NCR5380_read(STATUS_REG) & SR_REQ);
2122 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2123 sink = 0;
2124 continue;
2125 }
2126 switch (phase) {
2127 case PHASE_DATAIN:
2128 case PHASE_DATAOUT:
2129#if (NDEBUG & NDEBUG_NO_DATAOUT)
2130 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no);
2131 sink = 1;
2132 do_abort(instance);
2133 cmd->result = DID_ERROR << 16;
2134 cmd->done(cmd);
2135 return;
2136#endif
2137 /*
2138 * If there is no room left in the current buffer in the
2139 * scatter-gather list, move onto the next one.
2140 */
2141
2142 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2143 ++cmd->SCp.buffer;
2144 --cmd->SCp.buffers_residual;
2145 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2146 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+
2147 cmd->SCp.buffer->offset;
2148 dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual));
2149 }
2150 /*
2151 * The preferred transfer method is going to be
2152 * PSEUDO-DMA for systems that are strictly PIO,
2153 * since we can let the hardware do the handshaking.
2154 *
2155 * For this to work, we need to know the transfersize
2156 * ahead of time, since the pseudo-DMA code will sit
2157 * in an unconditional loop.
2158 */
2159
2160#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2161 /* KLL
2162 * PSEUDO_DMA is defined here. If this is the g_NCR5380
2163 * driver then it will always be defined, so the
2164 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
2165 * NCR5380 case. I think this is a fairly clean solution.
2166 * We supplement these 2 if's with the flag.
2167 */
2168#ifdef NCR5380_dma_xfer_len
2169 if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) {
2170#else
2171 transfersize = cmd->transfersize;
2172
2173#ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */
2174 if (transfersize > 512)
2175 transfersize = 512;
2176#endif /* LIMIT_TRANSFERSIZE */
2177
2178 if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) {
2179 /* Limit transfers to 32K, for xx400 & xx406
2180 * pseudoDMA that transfers in 128 bytes blocks. */
2181 if (transfersize > 32 * 1024)
2182 transfersize = 32 * 1024;
2183#endif
2184 len = transfersize;
2185 if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) {
2186 /*
2187 * If the watchdog timer fires, all future accesses to this
2188 * device will use the polled-IO.
2189 */
Jeff Garzik017560f2005-10-24 18:04:36 -04002190 scmd_printk(KERN_INFO, cmd,
2191 "switching to slow handshake\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002192 cmd->device->borken = 1;
2193 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2194 sink = 1;
2195 do_abort(instance);
2196 cmd->result = DID_ERROR << 16;
2197 cmd->done(cmd);
2198 /* XXX - need to source or sink data here, as appropriate */
2199 } else
2200 cmd->SCp.this_residual -= transfersize - len;
2201 } else
2202#endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */
2203 NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **)
2204 &cmd->SCp.ptr);
2205 break;
2206 case PHASE_MSGIN:
2207 len = 1;
2208 data = &tmp;
2209 NCR5380_transfer_pio(instance, &phase, &len, &data);
2210 cmd->SCp.Message = tmp;
2211
2212 switch (tmp) {
2213 /*
2214 * Linking lets us reduce the time required to get the
2215 * next command out to the device, hopefully this will
2216 * mean we don't waste another revolution due to the delays
2217 * required by ARBITRATION and another SELECTION.
2218 *
2219 * In the current implementation proposal, low level drivers
2220 * merely have to start the next command, pointed to by
2221 * next_link, done() is called as with unlinked commands.
2222 */
2223#ifdef LINKED
2224 case LINKED_CMD_COMPLETE:
2225 case LINKED_FLG_CMD_COMPLETE:
2226 /* Accept message by clearing ACK */
2227 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2228 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun));
2229 /*
2230 * Sanity check : A linked command should only terminate with
2231 * one of these messages if there are more linked commands
2232 * available.
2233 */
2234 if (!cmd->next_link) {
2235 printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun);
2236 sink = 1;
2237 do_abort(instance);
2238 return;
2239 }
2240 initialize_SCp(cmd->next_link);
2241 /* The next command is still part of this process */
2242 cmd->next_link->tag = cmd->tag;
2243 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2244 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));
2245 collect_stats(hostdata, cmd);
2246 cmd->scsi_done(cmd);
2247 cmd = hostdata->connected;
2248 break;
2249#endif /* def LINKED */
2250 case ABORT:
2251 case COMMAND_COMPLETE:
2252 /* Accept message by clearing ACK */
2253 sink = 1;
2254 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2255 hostdata->connected = NULL;
2256 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun));
2257 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2258
2259 /*
2260 * I'm not sure what the correct thing to do here is :
2261 *
2262 * If the command that just executed is NOT a request
2263 * sense, the obvious thing to do is to set the result
2264 * code to the values of the stored parameters.
2265 *
2266 * If it was a REQUEST SENSE command, we need some way
2267 * to differentiate between the failure code of the original
2268 * and the failure code of the REQUEST sense - the obvious
2269 * case is success, where we fall through and leave the result
2270 * code unchanged.
2271 *
2272 * The non-obvious place is where the REQUEST SENSE failed
2273 */
2274
2275 if (cmd->cmnd[0] != REQUEST_SENSE)
2276 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2277 else if (status_byte(cmd->SCp.Status) != GOOD)
2278 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2279
2280#ifdef AUTOSENSE
2281 if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2282 dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no));
2283 cmd->cmnd[0] = REQUEST_SENSE;
2284 cmd->cmnd[1] &= 0xe0;
2285 cmd->cmnd[2] = 0;
2286 cmd->cmnd[3] = 0;
2287 cmd->cmnd[4] = sizeof(cmd->sense_buffer);
2288 cmd->cmnd[5] = 0;
2289
2290 cmd->SCp.buffer = NULL;
2291 cmd->SCp.buffers_residual = 0;
2292 cmd->SCp.ptr = (char *) cmd->sense_buffer;
2293 cmd->SCp.this_residual = sizeof(cmd->sense_buffer);
2294
2295 LIST(cmd, hostdata->issue_queue);
2296 cmd->host_scribble = (unsigned char *)
2297 hostdata->issue_queue;
2298 hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2299 dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no));
2300 } else
2301#endif /* def AUTOSENSE */
2302 {
2303 collect_stats(hostdata, cmd);
2304 cmd->scsi_done(cmd);
2305 }
2306
2307 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2308 /*
2309 * Restore phase bits to 0 so an interrupted selection,
2310 * arbitration can resume.
2311 */
2312 NCR5380_write(TARGET_COMMAND_REG, 0);
2313
2314 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2315 barrier();
2316 return;
2317 case MESSAGE_REJECT:
2318 /* Accept message by clearing ACK */
2319 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2320 switch (hostdata->last_message) {
2321 case HEAD_OF_QUEUE_TAG:
2322 case ORDERED_QUEUE_TAG:
2323 case SIMPLE_QUEUE_TAG:
2324 cmd->device->simple_tags = 0;
2325 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2326 break;
2327 default:
2328 break;
2329 }
2330 case DISCONNECT:{
2331 /* Accept message by clearing ACK */
2332 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2333 cmd->device->disconnect = 1;
2334 LIST(cmd, hostdata->disconnected_queue);
2335 cmd->host_scribble = (unsigned char *)
2336 hostdata->disconnected_queue;
2337 hostdata->connected = NULL;
2338 hostdata->disconnected_queue = cmd;
2339 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));
2340 /*
2341 * Restore phase bits to 0 so an interrupted selection,
2342 * arbitration can resume.
2343 */
2344 NCR5380_write(TARGET_COMMAND_REG, 0);
2345
2346 /* Enable reselect interrupts */
2347 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2348 /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/
2349 /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */
2350 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2351 barrier();
2352 return;
2353 }
2354 /*
2355 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2356 * operation, in violation of the SCSI spec so we can safely
2357 * ignore SAVE/RESTORE pointers calls.
2358 *
2359 * Unfortunately, some disks violate the SCSI spec and
2360 * don't issue the required SAVE_POINTERS message before
2361 * disconnecting, and we have to break spec to remain
2362 * compatible.
2363 */
2364 case SAVE_POINTERS:
2365 case RESTORE_POINTERS:
2366 /* Accept message by clearing ACK */
2367 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2368 break;
2369 case EXTENDED_MESSAGE:
2370/*
2371 * Extended messages are sent in the following format :
2372 * Byte
2373 * 0 EXTENDED_MESSAGE == 1
2374 * 1 length (includes one byte for code, doesn't
2375 * include first two bytes)
2376 * 2 code
2377 * 3..length+1 arguments
2378 *
2379 * Start the extended message buffer with the EXTENDED_MESSAGE
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002380 * byte, since spi_print_msg() wants the whole thing.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002381 */
2382 extended_msg[0] = EXTENDED_MESSAGE;
2383 /* Accept first byte by clearing ACK */
2384 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2385 dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no));
2386
2387 len = 2;
2388 data = extended_msg + 1;
2389 phase = PHASE_MSGIN;
2390 NCR5380_transfer_pio(instance, &phase, &len, &data);
2391
2392 dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2]));
2393
2394 if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) {
2395 /* Accept third byte by clearing ACK */
2396 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2397 len = extended_msg[1] - 1;
2398 data = extended_msg + 3;
2399 phase = PHASE_MSGIN;
2400
2401 NCR5380_transfer_pio(instance, &phase, &len, &data);
2402 dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len));
2403
2404 switch (extended_msg[2]) {
2405 case EXTENDED_SDTR:
2406 case EXTENDED_WDTR:
2407 case EXTENDED_MODIFY_DATA_POINTER:
2408 case EXTENDED_EXTENDED_IDENTIFY:
2409 tmp = 0;
2410 }
2411 } else if (len) {
2412 printk("scsi%d: error receiving extended message\n", instance->host_no);
2413 tmp = 0;
2414 } else {
2415 printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]);
2416 tmp = 0;
2417 }
2418 /* Fall through to reject message */
2419
2420 /*
2421 * If we get something weird that we aren't expecting,
2422 * reject it.
2423 */
2424 default:
2425 if (!tmp) {
2426 printk("scsi%d: rejecting message ", instance->host_no);
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002427 spi_print_msg(extended_msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002428 printk("\n");
2429 } else if (tmp != EXTENDED_MESSAGE)
Jeff Garzik017560f2005-10-24 18:04:36 -04002430 scmd_printk(KERN_INFO, cmd,
2431 "rejecting unknown message %02x\n",tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002432 else
Jeff Garzik017560f2005-10-24 18:04:36 -04002433 scmd_printk(KERN_INFO, cmd,
2434 "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002435
2436 msgout = MESSAGE_REJECT;
2437 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2438 break;
2439 } /* switch (tmp) */
2440 break;
2441 case PHASE_MSGOUT:
2442 len = 1;
2443 data = &msgout;
2444 hostdata->last_message = msgout;
2445 NCR5380_transfer_pio(instance, &phase, &len, &data);
2446 if (msgout == ABORT) {
2447 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2448 hostdata->connected = NULL;
2449 cmd->result = DID_ERROR << 16;
2450 collect_stats(hostdata, cmd);
2451 cmd->scsi_done(cmd);
2452 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2453 return;
2454 }
2455 msgout = NOP;
2456 break;
2457 case PHASE_CMDOUT:
2458 len = cmd->cmd_len;
2459 data = cmd->cmnd;
2460 /*
2461 * XXX for performance reasons, on machines with a
2462 * PSEUDO-DMA architecture we should probably
2463 * use the dma transfer function.
2464 */
2465 NCR5380_transfer_pio(instance, &phase, &len, &data);
2466 if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) {
2467 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
2468 dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
2469 return;
2470 }
2471 break;
2472 case PHASE_STATIN:
2473 len = 1;
2474 data = &tmp;
2475 NCR5380_transfer_pio(instance, &phase, &len, &data);
2476 cmd->SCp.Status = tmp;
2477 break;
2478 default:
2479 printk("scsi%d : unknown phase\n", instance->host_no);
2480 NCR5380_dprint(NDEBUG_ALL, instance);
2481 } /* switch(phase) */
2482 } /* if (tmp * SR_REQ) */
2483 else {
2484 /* RvC: go to sleep if polling time expired
2485 */
2486 if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) {
2487 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
2488 dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
2489 return;
2490 }
2491 }
2492 } /* while (1) */
2493}
2494
2495/*
2496 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2497 *
2498 * Purpose : does reselection, initializing the instance->connected
2499 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2500 * nexus has been reestablished,
2501 *
2502 * Inputs : instance - this instance of the NCR5380.
2503 *
2504 * Locks: io_request_lock held by caller if IRQ driven
2505 */
2506
2507static void NCR5380_reselect(struct Scsi_Host *instance) {
2508 NCR5380_local_declare();
2509 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
2510 instance->hostdata;
2511 unsigned char target_mask;
2512 unsigned char lun, phase;
2513 int len;
2514 unsigned char msg[3];
2515 unsigned char *data;
2516 Scsi_Cmnd *tmp = NULL, *prev;
2517 int abort = 0;
2518 NCR5380_setup(instance);
2519
2520 /*
2521 * Disable arbitration, etc. since the host adapter obviously
2522 * lost, and tell an interrupted NCR5380_select() to restart.
2523 */
2524
2525 NCR5380_write(MODE_REG, MR_BASE);
2526 hostdata->restart_select = 1;
2527
2528 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2529 dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no));
2530
2531 /*
2532 * At this point, we have detected that our SCSI ID is on the bus,
2533 * SEL is true and BSY was false for at least one bus settle delay
2534 * (400 ns).
2535 *
2536 * We must assert BSY ourselves, until the target drops the SEL
2537 * signal.
2538 */
2539
2540 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2541
2542 /* FIXME: timeout too long, must fail to workqueue */
2543 if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0)
2544 abort = 1;
2545
2546 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2547
2548 /*
2549 * Wait for target to go into MSGIN.
2550 * FIXME: timeout needed and fail to work queeu
2551 */
2552
2553 if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ))
2554 abort = 1;
2555
2556 len = 1;
2557 data = msg;
2558 phase = PHASE_MSGIN;
2559 NCR5380_transfer_pio(instance, &phase, &len, &data);
2560
2561 if (!(msg[0] & 0x80)) {
2562 printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no);
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002563 spi_print_msg(msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002564 abort = 1;
2565 } else {
2566 /* Accept message by clearing ACK */
2567 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2568 lun = (msg[0] & 0x07);
2569
2570 /*
2571 * We need to add code for SCSI-II to track which devices have
2572 * I_T_L_Q nexuses established, and which have simple I_T_L
2573 * nexuses so we can chose to do additional data transfer.
2574 */
2575
2576 /*
2577 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2578 * just reestablished, and remove it from the disconnected queue.
2579 */
2580
2581
2582 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
2583 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2584 ) {
2585 if (prev) {
2586 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
2587 prev->host_scribble = tmp->host_scribble;
2588 } else {
2589 REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble);
2590 hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble;
2591 }
2592 tmp->host_scribble = NULL;
2593 break;
2594 }
2595 if (!tmp) {
2596 printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun);
2597 /*
2598 * Since we have an established nexus that we can't do anything with,
2599 * we must abort it.
2600 */
2601 abort = 1;
2602 }
2603 }
2604
2605 if (abort) {
2606 do_abort(instance);
2607 } else {
2608 hostdata->connected = tmp;
2609 dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag));
2610 }
2611}
2612
2613/*
2614 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
2615 *
2616 * Purpose : called by interrupt handler when DMA finishes or a phase
2617 * mismatch occurs (which would finish the DMA transfer).
2618 *
2619 * Inputs : instance - this instance of the NCR5380.
2620 *
2621 * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L
2622 * nexus has been reestablished, on failure NULL is returned.
2623 */
2624
2625#ifdef REAL_DMA
2626static void NCR5380_dma_complete(NCR5380_instance * instance) {
2627 NCR5380_local_declare();
2628 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata * instance->hostdata);
2629 int transferred;
2630 NCR5380_setup(instance);
2631
2632 /*
2633 * XXX this might not be right.
2634 *
2635 * Wait for final byte to transfer, ie wait for ACK to go false.
2636 *
2637 * We should use the Last Byte Sent bit, unfortunately this is
2638 * not available on the 5380/5381 (only the various CMOS chips)
2639 *
2640 * FIXME: timeout, and need to handle long timeout/irq case
2641 */
2642
2643 NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ);
2644
2645 NCR5380_write(MODE_REG, MR_BASE);
2646 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2647
2648 /*
2649 * The only places we should see a phase mismatch and have to send
2650 * data from the same set of pointers will be the data transfer
2651 * phases. So, residual, requested length are only important here.
2652 */
2653
2654 if (!(hostdata->connected->SCp.phase & SR_CD)) {
2655 transferred = instance->dmalen - NCR5380_dma_residual();
2656 hostdata->connected->SCp.this_residual -= transferred;
2657 hostdata->connected->SCp.ptr += transferred;
2658 }
2659}
2660#endif /* def REAL_DMA */
2661
2662/*
2663 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2664 *
2665 * Purpose : abort a command
2666 *
2667 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2668 * host byte of the result field to, if zero DID_ABORTED is
2669 * used.
2670 *
2671 * Returns : 0 - success, -1 on failure.
2672 *
2673 * XXX - there is no way to abort the command that is currently
2674 * connected, you have to wait for it to complete. If this is
2675 * a problem, we could implement longjmp() / setjmp(), setjmp()
2676 * called where the loop started in NCR5380_main().
2677 *
2678 * Locks: host lock taken by caller
2679 */
2680
2681static int NCR5380_abort(Scsi_Cmnd * cmd) {
2682 NCR5380_local_declare();
2683 struct Scsi_Host *instance = cmd->device->host;
2684 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
2685 Scsi_Cmnd *tmp, **prev;
2686
2687 printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no);
db9dff32005-04-03 14:53:59 -05002688 scsi_print_command(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002689
2690 NCR5380_print_status(instance);
2691
2692 NCR5380_setup(instance);
2693
2694 dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no));
2695 dprintk(NDEBUG_ABORT, (" basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG)));
2696
2697#if 0
2698/*
2699 * Case 1 : If the command is the currently executing command,
2700 * we'll set the aborted flag and return control so that
2701 * information transfer routine can exit cleanly.
2702 */
2703
2704 if (hostdata->connected == cmd) {
2705 dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no));
2706 hostdata->aborted = 1;
2707/*
2708 * We should perform BSY checking, and make sure we haven't slipped
2709 * into BUS FREE.
2710 */
2711
2712 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN);
2713/*
2714 * Since we can't change phases until we've completed the current
2715 * handshake, we have to source or sink a byte of data if the current
2716 * phase is not MSGOUT.
2717 */
2718
2719/*
2720 * Return control to the executing NCR drive so we can clear the
2721 * aborted flag and get back into our main loop.
2722 */
2723
2724 return 0;
2725 }
2726#endif
2727
2728/*
2729 * Case 2 : If the command hasn't been issued yet, we simply remove it
2730 * from the issue queue.
2731 */
2732
2733 dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no));
2734 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)
2735 if (cmd == tmp) {
2736 REMOVE(5, *prev, tmp, tmp->host_scribble);
2737 (*prev) = (Scsi_Cmnd *) tmp->host_scribble;
2738 tmp->host_scribble = NULL;
2739 tmp->result = DID_ABORT << 16;
2740 dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no));
2741 tmp->done(tmp);
2742 return SUCCESS;
2743 }
2744#if (NDEBUG & NDEBUG_ABORT)
2745 /* KLL */
2746 else if (prev == tmp)
2747 printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no);
2748#endif
2749
2750/*
2751 * Case 3 : If any commands are connected, we're going to fail the abort
2752 * and let the high level SCSI driver retry at a later time or
2753 * issue a reset.
2754 *
2755 * Timeouts, and therefore aborted commands, will be highly unlikely
2756 * and handling them cleanly in this situation would make the common
2757 * case of noresets less efficient, and would pollute our code. So,
2758 * we fail.
2759 */
2760
2761 if (hostdata->connected) {
2762 dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no));
2763 return FAILED;
2764 }
2765/*
2766 * Case 4: If the command is currently disconnected from the bus, and
2767 * there are no connected commands, we reconnect the I_T_L or
2768 * I_T_L_Q nexus associated with it, go into message out, and send
2769 * an abort message.
2770 *
2771 * This case is especially ugly. In order to reestablish the nexus, we
2772 * need to call NCR5380_select(). The easiest way to implement this
2773 * function was to abort if the bus was busy, and let the interrupt
2774 * handler triggered on the SEL for reselect take care of lost arbitrations
2775 * where necessary, meaning interrupts need to be enabled.
2776 *
2777 * When interrupts are enabled, the queues may change - so we
2778 * can't remove it from the disconnected queue before selecting it
2779 * because that could cause a failure in hashing the nexus if that
2780 * device reselected.
2781 *
2782 * Since the queues may change, we can't use the pointers from when we
2783 * first locate it.
2784 *
2785 * So, we must first locate the command, and if NCR5380_select()
2786 * succeeds, then issue the abort, relocate the command and remove
2787 * it from the disconnected queue.
2788 */
2789
2790 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble)
2791 if (cmd == tmp) {
2792 dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no));
2793
2794 if (NCR5380_select(instance, cmd, (int) cmd->tag))
2795 return FAILED;
2796 dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no));
2797
2798 do_abort(instance);
2799
2800 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)
2801 if (cmd == tmp) {
2802 REMOVE(5, *prev, tmp, tmp->host_scribble);
2803 *prev = (Scsi_Cmnd *) tmp->host_scribble;
2804 tmp->host_scribble = NULL;
2805 tmp->result = DID_ABORT << 16;
2806 tmp->done(tmp);
2807 return SUCCESS;
2808 }
2809 }
2810/*
2811 * Case 5 : If we reached this point, the command was not found in any of
2812 * the queues.
2813 *
2814 * We probably reached this point because of an unlikely race condition
2815 * between the command completing successfully and the abortion code,
2816 * so we won't panic, but we will notify the user in case something really
2817 * broke.
2818 */
2819 printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n"
2820 " before abortion\n", instance->host_no);
2821 return FAILED;
2822}
2823
2824
2825/*
2826 * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd)
2827 *
2828 * Purpose : reset the SCSI bus.
2829 *
2830 * Returns : SUCCESS
2831 *
2832 * Locks: host lock taken by caller
2833 */
2834
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04002835static int NCR5380_bus_reset(Scsi_Cmnd * cmd)
2836{
2837 struct Scsi_Host *instance = cmd->device->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002838
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04002839 NCR5380_local_declare();
2840 NCR5380_setup(instance);
2841 NCR5380_print_status(instance);
2842
2843 spin_lock_irq(instance->host_lock);
2844 do_reset(instance);
2845 spin_unlock_irq(instance->host_lock);
2846
Linus Torvalds1da177e2005-04-16 15:20:36 -07002847 return SUCCESS;
2848}