]> git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blame - drivers/scsi/NCR5380.c
scsi: merge consecutive seq_puts calls
[mirror_ubuntu-zesty-kernel.git] / drivers / scsi / NCR5380.c
CommitLineData
1da177e4
LT
1/*
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 *
1da177e4
LT
14 * For more information, please consult
15 *
16 * NCR 5380 Family
17 * SCSI Protocol Controller
18 * Databook
19 *
20 * NCR Microelectronics
21 * 1635 Aeroplaza Drive
22 * Colorado Springs, CO 80916
23 * 1+ (719) 578-3400
24 * 1+ (800) 334-5454
25 */
26
27/*
1da177e4 28 * Revision 1.10 1998/9/2 Alan Cox
fa195afe 29 * (alan@lxorguk.ukuu.org.uk)
1da177e4
LT
30 * Fixed up the timer lockups reported so far. Things still suck. Looking
31 * forward to 2.3 and per device request queues. Then it'll be possible to
32 * SMP thread this beast and improve life no end.
33
34 * Revision 1.9 1997/7/27 Ronald van Cuijlenborg
35 * (ronald.van.cuijlenborg@tip.nl or nutty@dds.nl)
36 * (hopefully) fixed and enhanced USLEEP
37 * added support for DTC3181E card (for Mustek scanner)
38 *
39
40 * Revision 1.8 Ingmar Baumgart
41 * (ingmar@gonzo.schwaben.de)
42 * added support for NCR53C400a card
43 *
44
45 * Revision 1.7 1996/3/2 Ray Van Tassle (rayvt@comm.mot.com)
46 * added proc_info
47 * added support needed for DTC 3180/3280
48 * fixed a couple of bugs
49 *
50
51 * Revision 1.5 1994/01/19 09:14:57 drew
52 * Fixed udelay() hack that was being used on DATAOUT phases
53 * instead of a proper wait for the final handshake.
54 *
55 * Revision 1.4 1994/01/19 06:44:25 drew
56 * *** empty log message ***
57 *
58 * Revision 1.3 1994/01/19 05:24:40 drew
59 * Added support for TCR LAST_BYTE_SENT bit.
60 *
61 * Revision 1.2 1994/01/15 06:14:11 drew
62 * REAL DMA support, bug fixes.
63 *
64 * Revision 1.1 1994/01/15 06:00:54 drew
65 * Initial revision
66 *
67 */
68
69/*
70 * Further development / testing that should be done :
71 * 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete
72 * code so that everything does the same thing that's done at the
73 * end of a pseudo-DMA read operation.
74 *
75 * 2. Fix REAL_DMA (interrupt driven, polled works fine) -
76 * basically, transfer size needs to be reduced by one
77 * and the last byte read as is done with PSEUDO_DMA.
78 *
79 * 4. Test SCSI-II tagged queueing (I have no devices which support
80 * tagged queueing)
81 *
82 * 5. Test linked command handling code after Eric is ready with
83 * the high level code.
84 */
db9dff36 85#include <scsi/scsi_dbg.h>
1abfd370 86#include <scsi/scsi_transport_spi.h>
1da177e4
LT
87
88#if (NDEBUG & NDEBUG_LISTS)
89#define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); }
90#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); }
91#else
92#define LIST(x,y)
93#define REMOVE(w,x,y,z)
94#endif
95
96#ifndef notyet
97#undef LINKED
98#undef REAL_DMA
99#endif
100
101#ifdef REAL_DMA_POLL
102#undef READ_OVERRUNS
103#define READ_OVERRUNS
104#endif
105
106#ifdef BOARD_REQUIRES_NO_DELAY
107#define io_recovery_delay(x)
108#else
109#define io_recovery_delay(x) udelay(x)
110#endif
111
112/*
113 * Design
114 *
115 * This is a generic 5380 driver. To use it on a different platform,
116 * one simply writes appropriate system specific macros (ie, data
117 * transfer - some PC's will use the I/O bus, 68K's must use
118 * memory mapped) and drops this file in their 'C' wrapper.
119 *
120 * (Note from hch: unfortunately it was not enough for the different
121 * m68k folks and instead of improving this driver they copied it
122 * and hacked it up for their needs. As a consequence they lost
123 * most updates to this driver. Maybe someone will fix all these
124 * drivers to use a common core one day..)
125 *
126 * As far as command queueing, two queues are maintained for
127 * each 5380 in the system - commands that haven't been issued yet,
128 * and commands that are currently executing. This means that an
129 * unlimited number of commands may be queued, letting
130 * more commands propagate from the higher driver levels giving higher
131 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
132 * allowing multiple commands to propagate all the way to a SCSI-II device
133 * while a command is already executing.
134 *
135 *
136 * Issues specific to the NCR5380 :
137 *
138 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
139 * piece of hardware that requires you to sit in a loop polling for
140 * the REQ signal as long as you are connected. Some devices are
141 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
142 * while doing long seek operations.
143 *
144 * The workaround for this is to keep track of devices that have
145 * disconnected. If the device hasn't disconnected, for commands that
146 * should disconnect, we do something like
147 *
148 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
149 *
150 * Some tweaking of N and M needs to be done. An algorithm based
151 * on "time to data" would give the best results as long as short time
152 * to datas (ie, on the same track) were considered, however these
153 * broken devices are the exception rather than the rule and I'd rather
154 * spend my time optimizing for the normal case.
155 *
156 * Architecture :
157 *
158 * At the heart of the design is a coroutine, NCR5380_main,
159 * which is started from a workqueue for each NCR5380 host in the
160 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by
161 * removing the commands from the issue queue and calling
162 * NCR5380_select() if a nexus is not established.
163 *
164 * Once a nexus is established, the NCR5380_information_transfer()
165 * phase goes through the various phases as instructed by the target.
166 * if the target goes into MSG IN and sends a DISCONNECT message,
167 * the command structure is placed into the per instance disconnected
168 * queue, and NCR5380_main tries to find more work. If the target is
169 * idle for too long, the system will try to sleep.
170 *
171 * If a command has disconnected, eventually an interrupt will trigger,
172 * calling NCR5380_intr() which will in turn call NCR5380_reselect
173 * to reestablish a nexus. This will run main if necessary.
174 *
175 * On command termination, the done function will be called as
176 * appropriate.
177 *
178 * SCSI pointers are maintained in the SCp field of SCSI command
179 * structures, being initialized after the command is connected
180 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
181 * Note that in violation of the standard, an implicit SAVE POINTERS operation
182 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
183 */
184
185/*
186 * Using this file :
187 * This file a skeleton Linux SCSI driver for the NCR 5380 series
188 * of chips. To use it, you write an architecture specific functions
189 * and macros and include this file in your driver.
190 *
191 * These macros control options :
192 * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be
193 * defined.
194 *
195 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
196 * for commands that return with a CHECK CONDITION status.
197 *
198 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
199 * transceivers.
200 *
201 * DONT_USE_INTR - if defined, never use interrupts, even if we probe or
202 * override-configure an IRQ.
203 *
204 * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512
205 * bytes at a time. Since interrupts are disabled by default during
206 * these transfers, we might need this to give reasonable interrupt
207 * service time if the transfer size gets too large.
208 *
209 * LINKED - if defined, linked commands are supported.
210 *
211 * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases.
212 *
213 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
214 *
215 * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't
216 * rely on phase mismatch and EOP interrupts to determine end
217 * of phase.
218 *
219 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You
220 * only really want to use this if you're having a problem with
221 * dropped characters during high speed communications, and even
222 * then, you're going to be better off twiddling with transfersize
223 * in the high level code.
224 *
225 * Defaults for these will be provided although the user may want to adjust
226 * these to allocate CPU resources to the SCSI driver or "real" code.
227 *
228 * USLEEP_SLEEP - amount of time, in jiffies, to sleep
229 *
230 * USLEEP_POLL - amount of time, in jiffies, to poll
231 *
232 * These macros MUST be defined :
233 * NCR5380_local_declare() - declare any local variables needed for your
234 * transfer routines.
235 *
236 * NCR5380_setup(instance) - initialize any local variables needed from a given
237 * instance of the host adapter for NCR5380_{read,write,pread,pwrite}
238 *
239 * NCR5380_read(register) - read from the specified register
240 *
241 * NCR5380_write(register, value) - write to the specific register
242 *
243 * NCR5380_implementation_fields - additional fields needed for this
244 * specific implementation of the NCR5380
245 *
246 * Either real DMA *or* pseudo DMA may be implemented
247 * REAL functions :
248 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
249 * Note that the DMA setup functions should return the number of bytes
250 * that they were able to program the controller for.
251 *
252 * Also note that generic i386/PC versions of these macros are
253 * available as NCR5380_i386_dma_write_setup,
254 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
255 *
256 * NCR5380_dma_write_setup(instance, src, count) - initialize
257 * NCR5380_dma_read_setup(instance, dst, count) - initialize
258 * NCR5380_dma_residual(instance); - residual count
259 *
260 * PSEUDO functions :
261 * NCR5380_pwrite(instance, src, count)
262 * NCR5380_pread(instance, dst, count);
263 *
264 * The generic driver is initialized by calling NCR5380_init(instance),
265 * after setting the appropriate host specific fields and ID. If the
266 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
267 * possible) function may be used.
268 */
269
270static int do_abort(struct Scsi_Host *host);
271static void do_reset(struct Scsi_Host *host);
272
273/*
274 * initialize_SCp - init the scsi pointer field
275 * @cmd: command block to set up
276 *
277 * Set up the internal fields in the SCSI command.
278 */
279
710ddd0d 280static inline void initialize_SCp(struct scsi_cmnd *cmd)
1da177e4
LT
281{
282 /*
283 * Initialize the Scsi Pointer field so that all of the commands in the
284 * various queues are valid.
285 */
286
9e0fe44d
BH
287 if (scsi_bufflen(cmd)) {
288 cmd->SCp.buffer = scsi_sglist(cmd);
289 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
45711f1a 290 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
1da177e4
LT
291 cmd->SCp.this_residual = cmd->SCp.buffer->length;
292 } else {
293 cmd->SCp.buffer = NULL;
294 cmd->SCp.buffers_residual = 0;
9e0fe44d
BH
295 cmd->SCp.ptr = NULL;
296 cmd->SCp.this_residual = 0;
1da177e4
LT
297 }
298}
299
300/**
301 * NCR5380_poll_politely - wait for NCR5380 status bits
302 * @instance: controller to poll
303 * @reg: 5380 register to poll
304 * @bit: Bitmask to check
305 * @val: Value required to exit
306 *
307 * Polls the NCR5380 in a reasonably efficient manner waiting for
308 * an event to occur, after a short quick poll we begin giving the
309 * CPU back in non IRQ contexts
310 *
311 * Returns the value of the register or a negative error code.
312 */
313
314static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t)
315{
316 NCR5380_local_declare();
317 int n = 500; /* At about 8uS a cycle for the cpu access */
318 unsigned long end = jiffies + t;
319 int r;
320
321 NCR5380_setup(instance);
322
323 while( n-- > 0)
324 {
325 r = NCR5380_read(reg);
326 if((r & bit) == val)
327 return 0;
328 cpu_relax();
329 }
330
331 /* t time yet ? */
332 while(time_before(jiffies, end))
333 {
334 r = NCR5380_read(reg);
335 if((r & bit) == val)
336 return 0;
337 if(!in_interrupt())
730a646d 338 cond_resched();
1da177e4
LT
339 else
340 cpu_relax();
341 }
342 return -ETIMEDOUT;
343}
344
345static struct {
346 unsigned char value;
347 const char *name;
702809ce 348} phases[] __maybe_unused = {
1da177e4
LT
349 {PHASE_DATAOUT, "DATAOUT"},
350 {PHASE_DATAIN, "DATAIN"},
351 {PHASE_CMDOUT, "CMDOUT"},
352 {PHASE_STATIN, "STATIN"},
353 {PHASE_MSGOUT, "MSGOUT"},
354 {PHASE_MSGIN, "MSGIN"},
355 {PHASE_UNKNOWN, "UNKNOWN"}
356};
357
185a7a1c 358#if NDEBUG
1da177e4
LT
359static struct {
360 unsigned char mask;
361 const char *name;
362} signals[] = {
363 {SR_DBP, "PARITY"},
364 {SR_RST, "RST"},
365 {SR_BSY, "BSY"},
366 {SR_REQ, "REQ"},
367 {SR_MSG, "MSG"},
368 {SR_CD, "CD"},
369 {SR_IO, "IO"},
370 {SR_SEL, "SEL"},
371 {0, NULL}
372},
373basrs[] = {
374 {BASR_ATN, "ATN"},
375 {BASR_ACK, "ACK"},
376 {0, NULL}
377},
378icrs[] = {
379 {ICR_ASSERT_RST, "ASSERT RST"},
380 {ICR_ASSERT_ACK, "ASSERT ACK"},
381 {ICR_ASSERT_BSY, "ASSERT BSY"},
382 {ICR_ASSERT_SEL, "ASSERT SEL"},
383 {ICR_ASSERT_ATN, "ASSERT ATN"},
384 {ICR_ASSERT_DATA, "ASSERT DATA"},
385 {0, NULL}
386},
387mrs[] = {
388 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"},
389 {MR_TARGET, "MODE TARGET"},
390 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"},
391 {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"},
392 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
393 {MR_DMA_MODE, "MODE DMA"},
394 {MR_ARBITRATE, "MODE ARBITRATION"},
395 {0, NULL}
396};
397
398/**
399 * NCR5380_print - print scsi bus signals
400 * @instance: adapter state to dump
401 *
402 * Print the SCSI bus signals for debugging purposes
403 *
404 * Locks: caller holds hostdata lock (not essential)
405 */
406
407static void NCR5380_print(struct Scsi_Host *instance)
408{
409 NCR5380_local_declare();
410 unsigned char status, data, basr, mr, icr, i;
411 NCR5380_setup(instance);
412
413 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
414 status = NCR5380_read(STATUS_REG);
415 mr = NCR5380_read(MODE_REG);
416 icr = NCR5380_read(INITIATOR_COMMAND_REG);
417 basr = NCR5380_read(BUS_AND_STATUS_REG);
418
419 printk("STATUS_REG: %02x ", status);
420 for (i = 0; signals[i].mask; ++i)
421 if (status & signals[i].mask)
422 printk(",%s", signals[i].name);
423 printk("\nBASR: %02x ", basr);
424 for (i = 0; basrs[i].mask; ++i)
425 if (basr & basrs[i].mask)
426 printk(",%s", basrs[i].name);
427 printk("\nICR: %02x ", icr);
428 for (i = 0; icrs[i].mask; ++i)
429 if (icr & icrs[i].mask)
430 printk(",%s", icrs[i].name);
431 printk("\nMODE: %02x ", mr);
432 for (i = 0; mrs[i].mask; ++i)
433 if (mr & mrs[i].mask)
434 printk(",%s", mrs[i].name);
435 printk("\n");
436}
437
438
439/*
440 * NCR5380_print_phase - show SCSI phase
441 * @instance: adapter to dump
442 *
443 * Print the current SCSI phase for debugging purposes
444 *
445 * Locks: none
446 */
447
448static void NCR5380_print_phase(struct Scsi_Host *instance)
449{
450 NCR5380_local_declare();
451 unsigned char status;
452 int i;
453 NCR5380_setup(instance);
454
455 status = NCR5380_read(STATUS_REG);
456 if (!(status & SR_REQ))
457 printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no);
458 else {
459 for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i);
460 printk("scsi%d : phase %s\n", instance->host_no, phases[i].name);
461 }
462}
463#endif
464
465/*
466 * These need tweaking, and would probably work best as per-device
467 * flags initialized differently for disk, tape, cd, etc devices.
468 * People with broken devices are free to experiment as to what gives
469 * the best results for them.
470 *
471 * USLEEP_SLEEP should be a minimum seek time.
472 *
473 * USLEEP_POLL should be a maximum rotational latency.
474 */
475#ifndef USLEEP_SLEEP
476/* 20 ms (reasonable hard disk speed) */
477#define USLEEP_SLEEP (20*HZ/1000)
478#endif
479/* 300 RPM (floppy speed) */
480#ifndef USLEEP_POLL
481#define USLEEP_POLL (200*HZ/1000)
482#endif
483#ifndef USLEEP_WAITLONG
484/* RvC: (reasonable time to wait on select error) */
485#define USLEEP_WAITLONG USLEEP_SLEEP
486#endif
487
488/*
489 * Function : int should_disconnect (unsigned char cmd)
490 *
d6e05edc 491 * Purpose : decide whether a command would normally disconnect or
1da177e4
LT
492 * not, since if it won't disconnect we should go to sleep.
493 *
494 * Input : cmd - opcode of SCSI command
495 *
496 * Returns : DISCONNECT_LONG if we should disconnect for a really long
497 * time (ie always, sleep, look for REQ active, sleep),
498 * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal
499 * time-to-data delay, DISCONNECT_NONE if this command would return
500 * immediately.
501 *
502 * Future sleep algorithms based on time to data can exploit
503 * something like this so they can differentiate between "normal"
504 * (ie, read, write, seek) and unusual commands (ie, * format).
505 *
506 * Note : We don't deal with commands that handle an immediate disconnect,
507 *
508 */
509
510static int should_disconnect(unsigned char cmd)
511{
512 switch (cmd) {
513 case READ_6:
514 case WRITE_6:
515 case SEEK_6:
516 case READ_10:
517 case WRITE_10:
518 case SEEK_10:
519 return DISCONNECT_TIME_TO_DATA;
520 case FORMAT_UNIT:
521 case SEARCH_HIGH:
522 case SEARCH_LOW:
523 case SEARCH_EQUAL:
524 return DISCONNECT_LONG;
525 default:
526 return DISCONNECT_NONE;
527 }
528}
529
530static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout)
531{
532 hostdata->time_expires = jiffies + timeout;
533 schedule_delayed_work(&hostdata->coroutine, timeout);
534}
535
536
537static int probe_irq __initdata = 0;
538
539/**
540 * probe_intr - helper for IRQ autoprobe
541 * @irq: interrupt number
542 * @dev_id: unused
543 * @regs: unused
544 *
545 * Set a flag to indicate the IRQ in question was received. This is
546 * used by the IRQ probe code.
547 */
548
7d12e780 549static irqreturn_t __init probe_intr(int irq, void *dev_id)
1da177e4
LT
550{
551 probe_irq = irq;
552 return IRQ_HANDLED;
553}
554
555/**
556 * NCR5380_probe_irq - find the IRQ of an NCR5380
557 * @instance: NCR5380 controller
558 * @possible: bitmask of ISA IRQ lines
559 *
560 * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ
561 * and then looking to see what interrupt actually turned up.
562 *
563 * Locks: none, irqs must be enabled on entry
564 */
565
702809ce
AM
566static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance,
567 int possible)
1da177e4
LT
568{
569 NCR5380_local_declare();
570 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
571 unsigned long timeout;
572 int trying_irqs, i, mask;
573 NCR5380_setup(instance);
574
22f5f10d 575 for (trying_irqs = 0, i = 1, mask = 2; i < 16; ++i, mask <<= 1)
4909cc2b 576 if ((mask & possible) && (request_irq(i, &probe_intr, 0, "NCR-probe", NULL) == 0))
1da177e4
LT
577 trying_irqs |= mask;
578
579 timeout = jiffies + (250 * HZ / 1000);
22f5f10d 580 probe_irq = NO_IRQ;
1da177e4
LT
581
582 /*
583 * A interrupt is triggered whenever BSY = false, SEL = true
584 * and a bit set in the SELECT_ENABLE_REG is asserted on the
585 * SCSI bus.
586 *
587 * Note that the bus is only driven when the phase control signals
588 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that
589 * to zero.
590 */
591
592 NCR5380_write(TARGET_COMMAND_REG, 0);
593 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
594 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
595 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL);
596
22f5f10d 597 while (probe_irq == NO_IRQ && time_before(jiffies, timeout))
a9a3047d 598 schedule_timeout_uninterruptible(1);
1da177e4
LT
599
600 NCR5380_write(SELECT_ENABLE_REG, 0);
601 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
602
22f5f10d 603 for (i = 1, mask = 2; i < 16; ++i, mask <<= 1)
1da177e4
LT
604 if (trying_irqs & mask)
605 free_irq(i, NULL);
606
607 return probe_irq;
608}
609
610/**
8c32513b
FT
611 * NCR58380_info - report driver and host information
612 * @instance: relevant scsi host instance
1da177e4 613 *
8c32513b 614 * For use as the host template info() handler.
1da177e4
LT
615 *
616 * Locks: none
617 */
618
8c32513b 619static const char *NCR5380_info(struct Scsi_Host *instance)
1da177e4 620{
8c32513b
FT
621 struct NCR5380_hostdata *hostdata = shost_priv(instance);
622
623 return hostdata->info;
624}
625
626static void prepare_info(struct Scsi_Host *instance)
627{
628 struct NCR5380_hostdata *hostdata = shost_priv(instance);
629
630 snprintf(hostdata->info, sizeof(hostdata->info),
631 "%s, io_port 0x%lx, n_io_port %d, "
632 "base 0x%lx, irq %d, "
633 "can_queue %d, cmd_per_lun %d, "
634 "sg_tablesize %d, this_id %d, "
635 "flags { %s%s%s}, "
636#if defined(USLEEP_POLL) && defined(USLEEP_WAITLONG)
637 "USLEEP_POLL %d, USLEEP_WAITLONG %d, "
638#endif
639 "options { %s} ",
640 instance->hostt->name, instance->io_port, instance->n_io_port,
641 instance->base, instance->irq,
642 instance->can_queue, instance->cmd_per_lun,
643 instance->sg_tablesize, instance->this_id,
644 hostdata->flags & FLAG_NCR53C400 ? "NCR53C400 " : "",
645 hostdata->flags & FLAG_DTC3181E ? "DTC3181E " : "",
646 hostdata->flags & FLAG_NO_PSEUDO_DMA ? "NO_PSEUDO_DMA " : "",
647#if defined(USLEEP_POLL) && defined(USLEEP_WAITLONG)
648 USLEEP_POLL, USLEEP_WAITLONG,
649#endif
1da177e4 650#ifdef AUTOPROBE_IRQ
8c32513b 651 "AUTOPROBE_IRQ "
1da177e4 652#endif
1da177e4 653#ifdef DIFFERENTIAL
8c32513b 654 "DIFFERENTIAL "
1da177e4
LT
655#endif
656#ifdef REAL_DMA
8c32513b 657 "REAL_DMA "
1da177e4
LT
658#endif
659#ifdef REAL_DMA_POLL
8c32513b 660 "REAL_DMA_POLL "
1da177e4
LT
661#endif
662#ifdef PARITY
8c32513b 663 "PARITY "
1da177e4
LT
664#endif
665#ifdef PSEUDO_DMA
8c32513b 666 "PSEUDO_DMA "
1da177e4
LT
667#endif
668#ifdef UNSAFE
8c32513b 669 "UNSAFE "
1da177e4 670#endif
8c32513b
FT
671#ifdef NCR53C400
672 "NCR53C400 "
673#endif
674 "");
1da177e4
LT
675}
676
677/**
678 * NCR5380_print_status - dump controller info
679 * @instance: controller to dump
680 *
681 * Print commands in the various queues, called from NCR5380_abort
682 * and NCR5380_debug to aid debugging.
683 *
684 * Locks: called functions disable irqs
685 */
686
687static void NCR5380_print_status(struct Scsi_Host *instance)
688{
689 NCR5380_dprint(NDEBUG_ANY, instance);
690 NCR5380_dprint_phase(NDEBUG_ANY, instance);
691}
692
a9c2dc43 693#ifdef PSEUDO_DMA
1da177e4
LT
694/******************************************/
695/*
696 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
697 *
698 * *buffer: I/O buffer
699 * **start: if inout == FALSE pointer into buffer where user read should start
700 * offset: current offset
701 * length: length of buffer
702 * hostno: Scsi_Host host_no
703 * inout: TRUE - user is writing; FALSE - user is reading
704 *
705 * Return the number of bytes read from or written
706 */
707
dd7ab71b
AV
708static int __maybe_unused NCR5380_write_info(struct Scsi_Host *instance,
709 char *buffer, int length)
710{
a9c2dc43
FT
711 struct NCR5380_hostdata *hostdata = shost_priv(instance);
712
713 hostdata->spin_max_r = 0;
714 hostdata->spin_max_w = 0;
715 return 0;
dd7ab71b 716}
a9c2dc43 717#endif
dd7ab71b 718
1da177e4 719static
710ddd0d 720void lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, struct seq_file *m);
1da177e4 721static
dd7ab71b 722void lprint_command(unsigned char *cmd, struct seq_file *m);
1da177e4 723static
dd7ab71b 724void lprint_opcode(int opcode, struct seq_file *m);
1da177e4 725
dd7ab71b
AV
726static int __maybe_unused NCR5380_show_info(struct seq_file *m,
727 struct Scsi_Host *instance)
1da177e4 728{
1da177e4 729 struct NCR5380_hostdata *hostdata;
710ddd0d 730 struct scsi_cmnd *ptr;
1da177e4
LT
731
732 hostdata = (struct NCR5380_hostdata *) instance->hostdata;
733
a9c2dc43 734#ifdef PSEUDO_DMA
0c3de38f 735 seq_printf(m, "Highwater I/O busy spin counts: write %d, read %d\n",
a9c2dc43 736 hostdata->spin_max_w, hostdata->spin_max_r);
1da177e4
LT
737#endif
738 spin_lock_irq(instance->host_lock);
739 if (!hostdata->connected)
0c3de38f 740 seq_printf(m, "scsi%d: no currently connected command\n", instance->host_no);
1da177e4 741 else
710ddd0d 742 lprint_Scsi_Cmnd((struct scsi_cmnd *) hostdata->connected, m);
0c3de38f 743 seq_printf(m, "scsi%d: issue_queue\n", instance->host_no);
710ddd0d 744 for (ptr = (struct scsi_cmnd *) hostdata->issue_queue; ptr; ptr = (struct scsi_cmnd *) ptr->host_scribble)
dd7ab71b 745 lprint_Scsi_Cmnd(ptr, m);
1da177e4 746
0c3de38f 747 seq_printf(m, "scsi%d: disconnected_queue\n", instance->host_no);
710ddd0d 748 for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr; ptr = (struct scsi_cmnd *) ptr->host_scribble)
dd7ab71b 749 lprint_Scsi_Cmnd(ptr, m);
1da177e4 750 spin_unlock_irq(instance->host_lock);
dd7ab71b 751 return 0;
1da177e4
LT
752}
753
710ddd0d 754static void lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, struct seq_file *m)
1da177e4 755{
0c3de38f 756 seq_printf(m, "scsi%d : destination target %d, lun %llu\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun);
91c40f24 757 seq_puts(m, " command = ");
dd7ab71b 758 lprint_command(cmd->cmnd, m);
1da177e4
LT
759}
760
dd7ab71b 761static void lprint_command(unsigned char *command, struct seq_file *m)
1da177e4
LT
762{
763 int i, s;
dd7ab71b 764 lprint_opcode(command[0], m);
1da177e4 765 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
0c3de38f 766 seq_printf(m, "%02x ", command[i]);
91c40f24 767 seq_puts(m, "\n");
1da177e4
LT
768}
769
dd7ab71b 770static void lprint_opcode(int opcode, struct seq_file *m)
1da177e4 771{
0c3de38f 772 seq_printf(m, "%2d (0x%02x)", opcode, opcode);
1da177e4
LT
773}
774
775
776/**
777 * NCR5380_init - initialise an NCR5380
778 * @instance: adapter to configure
779 * @flags: control flags
780 *
781 * Initializes *instance and corresponding 5380 chip,
782 * with flags OR'd into the initial flags value.
783 *
784 * Notes : I assume that the host, hostno, and id bits have been
785 * set correctly. I don't care about the irq and other fields.
786 *
787 * Returns 0 for success
788 *
789 * Locks: interrupts must be enabled when we are called
790 */
791
6f039790 792static int NCR5380_init(struct Scsi_Host *instance, int flags)
1da177e4
LT
793{
794 NCR5380_local_declare();
795 int i, pass;
796 unsigned long timeout;
797 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
798
799 if(in_interrupt())
800 printk(KERN_ERR "NCR5380_init called with interrupts off!\n");
801 /*
802 * On NCR53C400 boards, NCR5380 registers are mapped 8 past
803 * the base address.
804 */
805
806#ifdef NCR53C400
807 if (flags & FLAG_NCR53C400)
808 instance->NCR5380_instance_name += NCR53C400_address_adjust;
809#endif
810
811 NCR5380_setup(instance);
812
813 hostdata->aborted = 0;
814 hostdata->id_mask = 1 << instance->this_id;
815 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
816 if (i > hostdata->id_mask)
817 hostdata->id_higher_mask |= i;
818 for (i = 0; i < 8; ++i)
819 hostdata->busy[i] = 0;
820#ifdef REAL_DMA
821 hostdata->dmalen = 0;
822#endif
823 hostdata->targets_present = 0;
824 hostdata->connected = NULL;
825 hostdata->issue_queue = NULL;
826 hostdata->disconnected_queue = NULL;
827
c4028958 828 INIT_DELAYED_WORK(&hostdata->coroutine, NCR5380_main);
1da177e4 829
1da177e4
LT
830 /* The CHECK code seems to break the 53C400. Will check it later maybe */
831 if (flags & FLAG_NCR53C400)
832 hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags;
833 else
834 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags;
835
836 hostdata->host = instance;
837 hostdata->time_expires = 0;
838
8c32513b
FT
839 prepare_info(instance);
840
1da177e4
LT
841 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
842 NCR5380_write(MODE_REG, MR_BASE);
843 NCR5380_write(TARGET_COMMAND_REG, 0);
844 NCR5380_write(SELECT_ENABLE_REG, 0);
845
846#ifdef NCR53C400
847 if (hostdata->flags & FLAG_NCR53C400) {
848 NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
849 }
850#endif
851
852 /*
853 * Detect and correct bus wedge problems.
854 *
855 * If the system crashed, it may have crashed in a state
856 * where a SCSI command was still executing, and the
857 * SCSI bus is not in a BUS FREE STATE.
858 *
859 * If this is the case, we'll try to abort the currently
860 * established nexus which we know nothing about, and that
861 * failing, do a hard reset of the SCSI bus
862 */
863
864 for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) {
865 switch (pass) {
866 case 1:
867 case 3:
868 case 5:
869 printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no);
870 timeout = jiffies + 5 * HZ;
871 NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ);
872 break;
873 case 2:
874 printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no);
875 do_abort(instance);
876 break;
877 case 4:
878 printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no);
879 do_reset(instance);
880 break;
881 case 6:
882 printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no);
883 return -ENXIO;
884 }
885 }
886 return 0;
887}
888
889/**
890 * NCR5380_exit - remove an NCR5380
891 * @instance: adapter to remove
892 */
893
a43cf0f3 894static void NCR5380_exit(struct Scsi_Host *instance)
1da177e4
LT
895{
896 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
897
a684b8da 898 cancel_delayed_work_sync(&hostdata->coroutine);
1da177e4
LT
899}
900
901/**
902 * NCR5380_queue_command - queue a command
903 * @cmd: SCSI command
904 * @done: completion handler
905 *
906 * cmd is added to the per instance issue_queue, with minor
907 * twiddling done to the host specific fields of cmd. If the
908 * main coroutine is not running, it is restarted.
909 *
910 * Locks: host lock taken by caller
911 */
912
710ddd0d 913static int NCR5380_queue_command_lck(struct scsi_cmnd *cmd, void (*done) (struct scsi_cmnd *))
1da177e4
LT
914{
915 struct Scsi_Host *instance = cmd->device->host;
916 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
710ddd0d 917 struct scsi_cmnd *tmp;
1da177e4
LT
918
919#if (NDEBUG & NDEBUG_NO_WRITE)
920 switch (cmd->cmnd[0]) {
921 case WRITE_6:
922 case WRITE_10:
923 printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no);
924 cmd->result = (DID_ERROR << 16);
925 done(cmd);
926 return 0;
927 }
928#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
929
1da177e4
LT
930 /*
931 * We use the host_scribble field as a pointer to the next command
932 * in a queue
933 */
934
935 cmd->host_scribble = NULL;
936 cmd->scsi_done = done;
937 cmd->result = 0;
938
939 /*
940 * Insert the cmd into the issue queue. Note that REQUEST SENSE
941 * commands are added to the head of the queue since any command will
942 * clear the contingent allegiance condition that exists and the
943 * sense data is only guaranteed to be valid while the condition exists.
944 */
945
946 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
947 LIST(cmd, hostdata->issue_queue);
948 cmd->host_scribble = (unsigned char *) hostdata->issue_queue;
949 hostdata->issue_queue = cmd;
950 } else {
710ddd0d 951 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (struct scsi_cmnd *) tmp->host_scribble);
1da177e4
LT
952 LIST(cmd, tmp);
953 tmp->host_scribble = (unsigned char *) cmd;
954 }
52a6a1cb 955 dprintk(NDEBUG_QUEUES, "scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
1da177e4
LT
956
957 /* Run the coroutine if it isn't already running. */
958 /* Kick off command processing */
c4028958 959 schedule_delayed_work(&hostdata->coroutine, 0);
1da177e4
LT
960 return 0;
961}
962
f281233d 963static DEF_SCSI_QCMD(NCR5380_queue_command)
1da177e4
LT
964
965/**
966 * NCR5380_main - NCR state machines
967 *
968 * NCR5380_main is a coroutine that runs as long as more work can
969 * be done on the NCR5380 host adapters in a system. Both
970 * NCR5380_queue_command() and NCR5380_intr() will try to start it
971 * in case it is not running.
972 *
973 * Locks: called as its own thread with no locks held. Takes the
974 * host lock and called routines may take the isa dma lock.
975 */
976
c4028958 977static void NCR5380_main(struct work_struct *work)
1da177e4 978{
c4028958
DH
979 struct NCR5380_hostdata *hostdata =
980 container_of(work, struct NCR5380_hostdata, coroutine.work);
1da177e4 981 struct Scsi_Host *instance = hostdata->host;
710ddd0d 982 struct scsi_cmnd *tmp, *prev;
1da177e4
LT
983 int done;
984
985 spin_lock_irq(instance->host_lock);
986 do {
987 /* Lock held here */
988 done = 1;
989 if (!hostdata->connected && !hostdata->selecting) {
52a6a1cb 990 dprintk(NDEBUG_MAIN, "scsi%d : not connected\n", instance->host_no);
1da177e4
LT
991 /*
992 * Search through the issue_queue for a command destined
993 * for a target that's not busy.
994 */
710ddd0d 995 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (struct scsi_cmnd *) tmp->host_scribble)
1da177e4
LT
996 {
997 if (prev != tmp)
9cb78c16 998 dprintk(NDEBUG_LISTS, "MAIN tmp=%p target=%d busy=%d lun=%llu\n", tmp, tmp->device->id, hostdata->busy[tmp->device->id], tmp->device->lun);
1da177e4 999 /* When we find one, remove it from the issue queue. */
9cb78c16
HR
1000 if (!(hostdata->busy[tmp->device->id] &
1001 (1 << (u8)(tmp->device->lun & 0xff)))) {
1da177e4
LT
1002 if (prev) {
1003 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
1004 prev->host_scribble = tmp->host_scribble;
1005 } else {
1006 REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble);
710ddd0d 1007 hostdata->issue_queue = (struct scsi_cmnd *) tmp->host_scribble;
1da177e4
LT
1008 }
1009 tmp->host_scribble = NULL;
1010
1011 /*
1012 * Attempt to establish an I_T_L nexus here.
1013 * On success, instance->hostdata->connected is set.
1014 * On failure, we must add the command back to the
1015 * issue queue so we can keep trying.
1016 */
9cb78c16 1017 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, "scsi%d : main() : command for target %d lun %llu removed from issue_queue\n", instance->host_no, tmp->device->id, tmp->device->lun);
1da177e4
LT
1018
1019 /*
1020 * A successful selection is defined as one that
1021 * leaves us with the command connected and
1022 * in hostdata->connected, OR has terminated the
1023 * command.
1024 *
1025 * With successful commands, we fall through
1026 * and see if we can do an information transfer,
1027 * with failures we will restart.
1028 */
1029 hostdata->selecting = NULL;
1030 /* RvC: have to preset this to indicate a new command is being performed */
1031
76f13b93
FT
1032 /*
1033 * REQUEST SENSE commands are issued without tagged
1034 * queueing, even on SCSI-II devices because the
1035 * contingent allegiance condition exists for the
1036 * entire unit.
1037 */
1038
1039 if (!NCR5380_select(instance, tmp)) {
1da177e4
LT
1040 break;
1041 } else {
1042 LIST(tmp, hostdata->issue_queue);
1043 tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1044 hostdata->issue_queue = tmp;
1045 done = 0;
52a6a1cb 1046 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, "scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no);
1da177e4
LT
1047 }
1048 /* lock held here still */
1049 } /* if target/lun is not busy */
1050 } /* for */
1051 /* exited locked */
1052 } /* if (!hostdata->connected) */
1053 if (hostdata->selecting) {
710ddd0d 1054 tmp = (struct scsi_cmnd *) hostdata->selecting;
1da177e4 1055 /* Selection will drop and retake the lock */
76f13b93 1056 if (!NCR5380_select(instance, tmp)) {
1da177e4
LT
1057 /* Ok ?? */
1058 } else {
1059 /* RvC: device failed, so we wait a long time
1060 this is needed for Mustek scanners, that
1061 do not respond to commands immediately
1062 after a scan */
1063 printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id);
1064 LIST(tmp, hostdata->issue_queue);
1065 tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1066 hostdata->issue_queue = tmp;
1067 NCR5380_set_timer(hostdata, USLEEP_WAITLONG);
1068 }
1069 } /* if hostdata->selecting */
1070 if (hostdata->connected
1071#ifdef REAL_DMA
1072 && !hostdata->dmalen
1073#endif
1074 && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies))
1075 ) {
52a6a1cb 1076 dprintk(NDEBUG_MAIN, "scsi%d : main() : performing information transfer\n", instance->host_no);
1da177e4 1077 NCR5380_information_transfer(instance);
52a6a1cb 1078 dprintk(NDEBUG_MAIN, "scsi%d : main() : done set false\n", instance->host_no);
1da177e4
LT
1079 done = 0;
1080 } else
1081 break;
1082 } while (!done);
1083
1084 spin_unlock_irq(instance->host_lock);
1085}
1086
1087#ifndef DONT_USE_INTR
1088
1089/**
1090 * NCR5380_intr - generic NCR5380 irq handler
1091 * @irq: interrupt number
1092 * @dev_id: device info
1da177e4
LT
1093 *
1094 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1095 * from the disconnected queue, and restarting NCR5380_main()
1096 * as required.
1097 *
1098 * Locks: takes the needed instance locks
1099 */
1100
baa9aac6 1101static irqreturn_t NCR5380_intr(int dummy, void *dev_id)
1da177e4
LT
1102{
1103 NCR5380_local_declare();
baa9aac6 1104 struct Scsi_Host *instance = dev_id;
1da177e4
LT
1105 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1106 int done;
1107 unsigned char basr;
1108 unsigned long flags;
1109
52a6a1cb
FT
1110 dprintk(NDEBUG_INTR, "scsi : NCR5380 irq %d triggered\n",
1111 instance->irq);
1da177e4
LT
1112
1113 do {
1114 done = 1;
1115 spin_lock_irqsave(instance->host_lock, flags);
1116 /* Look for pending interrupts */
1117 NCR5380_setup(instance);
1118 basr = NCR5380_read(BUS_AND_STATUS_REG);
1119 /* XXX dispatch to appropriate routine if found and done=0 */
1120 if (basr & BASR_IRQ) {
1121 NCR5380_dprint(NDEBUG_INTR, instance);
1122 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1123 done = 0;
52a6a1cb 1124 dprintk(NDEBUG_INTR, "scsi%d : SEL interrupt\n", instance->host_no);
1da177e4
LT
1125 NCR5380_reselect(instance);
1126 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1127 } else if (basr & BASR_PARITY_ERROR) {
52a6a1cb 1128 dprintk(NDEBUG_INTR, "scsi%d : PARITY interrupt\n", instance->host_no);
1da177e4
LT
1129 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1130 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
52a6a1cb 1131 dprintk(NDEBUG_INTR, "scsi%d : RESET interrupt\n", instance->host_no);
1da177e4
LT
1132 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1133 } else {
1134#if defined(REAL_DMA)
1135 /*
1136 * We should only get PHASE MISMATCH and EOP interrupts
1137 * if we have DMA enabled, so do a sanity check based on
1138 * the current setting of the MODE register.
1139 */
1140
1141 if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) {
25985edc 1142 int transferred;
1da177e4
LT
1143
1144 if (!hostdata->connected)
1145 panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno);
1146
25985edc 1147 transferred = (hostdata->dmalen - NCR5380_dma_residual(instance));
1da177e4
LT
1148 hostdata->connected->SCp.this_residual -= transferred;
1149 hostdata->connected->SCp.ptr += transferred;
1150 hostdata->dmalen = 0;
1151
1152 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1153
1154 /* FIXME: we need to poll briefly then defer a workqueue task ! */
1155 NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ);
1156
1157 NCR5380_write(MODE_REG, MR_BASE);
1158 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1159 }
1160#else
52a6a1cb 1161 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));
1da177e4
LT
1162 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1163#endif
1164 }
1165 } /* if BASR_IRQ */
1166 spin_unlock_irqrestore(instance->host_lock, flags);
1167 if(!done)
c4028958 1168 schedule_delayed_work(&hostdata->coroutine, 0);
1da177e4
LT
1169 } while (!done);
1170 return IRQ_HANDLED;
1171}
1172
1173#endif
1174
1da177e4 1175/*
710ddd0d
FT
1176 * Function : int NCR5380_select(struct Scsi_Host *instance,
1177 * struct scsi_cmnd *cmd)
1da177e4
LT
1178 *
1179 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1180 * including ARBITRATION, SELECTION, and initial message out for
1181 * IDENTIFY and queue messages.
1182 *
1183 * Inputs : instance - instantiation of the 5380 driver on which this
76f13b93 1184 * target lives, cmd - SCSI command to execute.
1da177e4
LT
1185 *
1186 * Returns : -1 if selection could not execute for some reason,
1187 * 0 if selection succeeded or failed because the target
1188 * did not respond.
1189 *
1190 * Side effects :
1191 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1192 * with registers as they should have been on entry - ie
1193 * SELECT_ENABLE will be set appropriately, the NCR5380
1194 * will cease to drive any SCSI bus signals.
1195 *
1196 * If successful : I_T_L or I_T_L_Q nexus will be established,
1197 * instance->connected will be set to cmd.
1198 * SELECT interrupt will be disabled.
1199 *
1200 * If failed (no target) : cmd->scsi_done() will be called, and the
1201 * cmd->result host byte set to DID_BAD_TARGET.
1202 *
1203 * Locks: caller holds hostdata lock in IRQ mode
1204 */
1205
710ddd0d 1206static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd)
1da177e4
LT
1207{
1208 NCR5380_local_declare();
1209 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1210 unsigned char tmp[3], phase;
1211 unsigned char *data;
1212 int len;
1213 unsigned long timeout;
1214 unsigned char value;
1215 int err;
1216 NCR5380_setup(instance);
1217
1218 if (hostdata->selecting)
1219 goto part2;
1220
1221 hostdata->restart_select = 0;
1222
1223 NCR5380_dprint(NDEBUG_ARBITRATION, instance);
52a6a1cb 1224 dprintk(NDEBUG_ARBITRATION, "scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id);
1da177e4
LT
1225
1226 /*
1227 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1228 * data bus during SELECTION.
1229 */
1230
1231 NCR5380_write(TARGET_COMMAND_REG, 0);
1232
1233 /*
1234 * Start arbitration.
1235 */
1236
1237 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1238 NCR5380_write(MODE_REG, MR_ARBITRATE);
1239
1240
1241 /* We can be relaxed here, interrupts are on, we are
1242 in workqueue context, the birds are singing in the trees */
1243 spin_unlock_irq(instance->host_lock);
1244 err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ);
1245 spin_lock_irq(instance->host_lock);
1246 if (err < 0) {
1247 printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__);
1248 NCR5380_write(MODE_REG, MR_BASE);
1249 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1250 goto failed;
1251 }
1252
52a6a1cb 1253 dprintk(NDEBUG_ARBITRATION, "scsi%d : arbitration complete\n", instance->host_no);
1da177e4
LT
1254
1255 /*
1256 * The arbitration delay is 2.2us, but this is a minimum and there is
1257 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1258 * the integral nature of udelay().
1259 *
1260 */
1261
1262 udelay(3);
1263
1264 /* Check for lost arbitration */
1265 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)) {
1266 NCR5380_write(MODE_REG, MR_BASE);
52a6a1cb 1267 dprintk(NDEBUG_ARBITRATION, "scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no);
1da177e4
LT
1268 goto failed;
1269 }
1270 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL);
1271
1272 if (!(hostdata->flags & FLAG_DTC3181E) &&
1273 /* RvC: DTC3181E has some trouble with this
1274 * so we simply removed it. Seems to work with
1275 * only Mustek scanner attached
1276 */
1277 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
1278 NCR5380_write(MODE_REG, MR_BASE);
1279 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
52a6a1cb 1280 dprintk(NDEBUG_ARBITRATION, "scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no);
1da177e4
LT
1281 goto failed;
1282 }
1283 /*
1284 * Again, bus clear + bus settle time is 1.2us, however, this is
1285 * a minimum so we'll udelay ceil(1.2)
1286 */
1287
1288 udelay(2);
1289
52a6a1cb 1290 dprintk(NDEBUG_ARBITRATION, "scsi%d : won arbitration\n", instance->host_no);
1da177e4
LT
1291
1292 /*
1293 * Now that we have won arbitration, start Selection process, asserting
1294 * the host and target ID's on the SCSI bus.
1295 */
1296
422c0d61 1297 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd))));
1da177e4
LT
1298
1299 /*
1300 * Raise ATN while SEL is true before BSY goes false from arbitration,
1301 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1302 * phase immediately after selection.
1303 */
1304
1305 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1306 NCR5380_write(MODE_REG, MR_BASE);
1307
1308 /*
1309 * Reselect interrupts must be turned off prior to the dropping of BSY,
1310 * otherwise we will trigger an interrupt.
1311 */
1312 NCR5380_write(SELECT_ENABLE_REG, 0);
1313
1314 /*
1315 * The initiator shall then wait at least two deskew delays and release
1316 * the BSY signal.
1317 */
1318 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1319
1320 /* Reset BSY */
1321 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1322
1323 /*
1324 * Something weird happens when we cease to drive BSY - looks
1325 * like the board/chip is letting us do another read before the
1326 * appropriate propagation delay has expired, and we're confusing
1327 * a BSY signal from ourselves as the target's response to SELECTION.
1328 *
1329 * A small delay (the 'C++' frontend breaks the pipeline with an
1330 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1331 * tighter 'C' code breaks and requires this) solves the problem -
1332 * the 1 us delay is arbitrary, and only used because this delay will
1333 * be the same on other platforms and since it works here, it should
1334 * work there.
1335 *
1336 * wingel suggests that this could be due to failing to wait
1337 * one deskew delay.
1338 */
1339
1340 udelay(1);
1341
52a6a1cb 1342 dprintk(NDEBUG_SELECTION, "scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd));
1da177e4
LT
1343
1344 /*
1345 * The SCSI specification calls for a 250 ms timeout for the actual
1346 * selection.
1347 */
1348
1349 timeout = jiffies + (250 * HZ / 1000);
1350
1351 /*
1352 * XXX very interesting - we're seeing a bounce where the BSY we
1353 * asserted is being reflected / still asserted (propagation delay?)
1354 * and it's detecting as true. Sigh.
1355 */
1356
1357 hostdata->select_time = 0; /* we count the clock ticks at which we polled */
1358 hostdata->selecting = cmd;
1359
1360part2:
1361 /* RvC: here we enter after a sleeping period, or immediately after
1362 execution of part 1
1363 we poll only once ech clock tick */
1364 value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO);
1365
1366 if (!value && (hostdata->select_time < HZ/4)) {
1367 /* RvC: we still must wait for a device response */
1368 hostdata->select_time++; /* after 25 ticks the device has failed */
1369 NCR5380_set_timer(hostdata, 1);
1370 return 0; /* RvC: we return here with hostdata->selecting set,
1371 to go to sleep */
1372 }
1373
1374 hostdata->selecting = NULL;/* clear this pointer, because we passed the
1375 waiting period */
1376 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1377 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1378 NCR5380_reselect(instance);
1379 printk("scsi%d : reselection after won arbitration?\n", instance->host_no);
1380 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1381 return -1;
1382 }
1383 /*
1384 * No less than two deskew delays after the initiator detects the
1385 * BSY signal is true, it shall release the SEL signal and may
1386 * change the DATA BUS. -wingel
1387 */
1388
1389 udelay(1);
1390
1391 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1392
1393 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1394 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
422c0d61 1395 if (hostdata->targets_present & (1 << scmd_id(cmd))) {
1da177e4
LT
1396 printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no);
1397 if (hostdata->restart_select)
1398 printk(KERN_DEBUG "\trestart select\n");
1399 NCR5380_dprint(NDEBUG_SELECTION, instance);
1400 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1401 return -1;
1402 }
1403 cmd->result = DID_BAD_TARGET << 16;
1da177e4
LT
1404 cmd->scsi_done(cmd);
1405 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
52a6a1cb 1406 dprintk(NDEBUG_SELECTION, "scsi%d : target did not respond within 250ms\n", instance->host_no);
1da177e4
LT
1407 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1408 return 0;
1409 }
422c0d61 1410 hostdata->targets_present |= (1 << scmd_id(cmd));
1da177e4
LT
1411
1412 /*
1413 * Since we followed the SCSI spec, and raised ATN while SEL
1414 * was true but before BSY was false during selection, the information
1415 * transfer phase should be a MESSAGE OUT phase so that we can send the
1416 * IDENTIFY message.
1417 *
1418 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1419 * message (2 bytes) with a tag ID that we increment with every command
1420 * until it wraps back to 0.
1421 *
1422 * XXX - it turns out that there are some broken SCSI-II devices,
1423 * which claim to support tagged queuing but fail when more than
1424 * some number of commands are issued at once.
1425 */
1426
1427 /* Wait for start of REQ/ACK handshake */
1428
1429 spin_unlock_irq(instance->host_lock);
1430 err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ);
1431 spin_lock_irq(instance->host_lock);
1432
1433 if(err) {
1434 printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__);
1435 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1436 goto failed;
1437 }
1438
52a6a1cb 1439 dprintk(NDEBUG_SELECTION, "scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id);
22f5f10d 1440 tmp[0] = IDENTIFY(((instance->irq == NO_IRQ) ? 0 : 1), cmd->device->lun);
1da177e4
LT
1441
1442 len = 1;
1443 cmd->tag = 0;
1444
1445 /* Send message(s) */
1446 data = tmp;
1447 phase = PHASE_MSGOUT;
1448 NCR5380_transfer_pio(instance, &phase, &len, &data);
52a6a1cb 1449 dprintk(NDEBUG_SELECTION, "scsi%d : nexus established.\n", instance->host_no);
1da177e4
LT
1450 /* XXX need to handle errors here */
1451 hostdata->connected = cmd;
9cb78c16 1452 hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF));
1da177e4 1453
28424d3a 1454 initialize_SCp(cmd);
1da177e4
LT
1455
1456 return 0;
1457
1458 /* Selection failed */
1459failed:
1460 return -1;
1461
1462}
1463
1464/*
1465 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1466 * unsigned char *phase, int *count, unsigned char **data)
1467 *
1468 * Purpose : transfers data in given phase using polled I/O
1469 *
1470 * Inputs : instance - instance of driver, *phase - pointer to
1471 * what phase is expected, *count - pointer to number of
1472 * bytes to transfer, **data - pointer to data pointer.
1473 *
1474 * Returns : -1 when different phase is entered without transferring
25985edc 1475 * maximum number of bytes, 0 if all bytes or transferred or exit
1da177e4
LT
1476 * is in same phase.
1477 *
1478 * Also, *phase, *count, *data are modified in place.
1479 *
1480 * XXX Note : handling for bus free may be useful.
1481 */
1482
1483/*
1484 * Note : this code is not as quick as it could be, however it
1485 * IS 100% reliable, and for the actual data transfer where speed
1486 * counts, we will always do a pseudo DMA or DMA transfer.
1487 */
1488
1489static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1490 NCR5380_local_declare();
1491 unsigned char p = *phase, tmp;
1492 int c = *count;
1493 unsigned char *d = *data;
1494 /*
1495 * RvC: some administrative data to process polling time
1496 */
1497 int break_allowed = 0;
1498 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1499 NCR5380_setup(instance);
1500
1501 if (!(p & SR_IO))
52a6a1cb 1502 dprintk(NDEBUG_PIO, "scsi%d : pio write %d bytes\n", instance->host_no, c);
1da177e4 1503 else
52a6a1cb 1504 dprintk(NDEBUG_PIO, "scsi%d : pio read %d bytes\n", instance->host_no, c);
1da177e4
LT
1505
1506 /*
1507 * The NCR5380 chip will only drive the SCSI bus when the
1508 * phase specified in the appropriate bits of the TARGET COMMAND
1509 * REGISTER match the STATUS REGISTER
1510 */
1511
1512 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1513
1514 /* RvC: don't know if this is necessary, but other SCSI I/O is short
1515 * so breaks are not necessary there
1516 */
1517 if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) {
1518 break_allowed = 1;
1519 }
1520 do {
1521 /*
1522 * Wait for assertion of REQ, after which the phase bits will be
1523 * valid
1524 */
1525
1526 /* RvC: we simply poll once, after that we stop temporarily
1527 * and let the device buffer fill up
1528 * if breaking is not allowed, we keep polling as long as needed
1529 */
1530
1531 /* FIXME */
1532 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed);
1533 if (!(tmp & SR_REQ)) {
1534 /* timeout condition */
1535 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
1536 break;
1537 }
1538
52a6a1cb 1539 dprintk(NDEBUG_HANDSHAKE, "scsi%d : REQ detected\n", instance->host_no);
1da177e4
LT
1540
1541 /* Check for phase mismatch */
1542 if ((tmp & PHASE_MASK) != p) {
52a6a1cb 1543 dprintk(NDEBUG_HANDSHAKE, "scsi%d : phase mismatch\n", instance->host_no);
1da177e4
LT
1544 NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance);
1545 break;
1546 }
1547 /* Do actual transfer from SCSI bus to / from memory */
1548 if (!(p & SR_IO))
1549 NCR5380_write(OUTPUT_DATA_REG, *d);
1550 else
1551 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1552
1553 ++d;
1554
1555 /*
1556 * The SCSI standard suggests that in MSGOUT phase, the initiator
1557 * should drop ATN on the last byte of the message phase
1558 * after REQ has been asserted for the handshake but before
1559 * the initiator raises ACK.
1560 */
1561
1562 if (!(p & SR_IO)) {
1563 if (!((p & SR_MSG) && c > 1)) {
1564 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1565 NCR5380_dprint(NDEBUG_PIO, instance);
1566 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1567 } else {
1568 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1569 NCR5380_dprint(NDEBUG_PIO, instance);
1570 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1571 }
1572 } else {
1573 NCR5380_dprint(NDEBUG_PIO, instance);
1574 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1575 }
1576
1577 /* FIXME - if this fails bus reset ?? */
1578 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ);
52a6a1cb 1579 dprintk(NDEBUG_HANDSHAKE, "scsi%d : req false, handshake complete\n", instance->host_no);
1da177e4
LT
1580
1581/*
1582 * We have several special cases to consider during REQ/ACK handshaking :
1583 * 1. We were in MSGOUT phase, and we are on the last byte of the
1584 * message. ATN must be dropped as ACK is dropped.
1585 *
1586 * 2. We are in a MSGIN phase, and we are on the last byte of the
1587 * message. We must exit with ACK asserted, so that the calling
1588 * code may raise ATN before dropping ACK to reject the message.
1589 *
1590 * 3. ACK and ATN are clear and the target may proceed as normal.
1591 */
1592 if (!(p == PHASE_MSGIN && c == 1)) {
1593 if (p == PHASE_MSGOUT && c > 1)
1594 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1595 else
1596 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1597 }
1598 } while (--c);
1599
52a6a1cb 1600 dprintk(NDEBUG_PIO, "scsi%d : residual %d\n", instance->host_no, c);
1da177e4
LT
1601
1602 *count = c;
1603 *data = d;
1604 tmp = NCR5380_read(STATUS_REG);
1605 if (tmp & SR_REQ)
1606 *phase = tmp & PHASE_MASK;
1607 else
1608 *phase = PHASE_UNKNOWN;
1609
1610 if (!c || (*phase == p))
1611 return 0;
1612 else
1613 return -1;
1614}
1615
1616/**
1617 * do_reset - issue a reset command
1618 * @host: adapter to reset
1619 *
1620 * Issue a reset sequence to the NCR5380 and try and get the bus
1621 * back into sane shape.
1622 *
1623 * Locks: caller holds queue lock
1624 */
1625
1626static void do_reset(struct Scsi_Host *host) {
1627 NCR5380_local_declare();
1628 NCR5380_setup(host);
1629
1630 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
1631 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
1632 udelay(25);
1633 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1634}
1635
1636/*
1637 * Function : do_abort (Scsi_Host *host)
1638 *
1639 * Purpose : abort the currently established nexus. Should only be
1640 * called from a routine which can drop into a
1641 *
1642 * Returns : 0 on success, -1 on failure.
1643 *
1644 * Locks: queue lock held by caller
1645 * FIXME: sort this out and get new_eh running
1646 */
1647
1648static int do_abort(struct Scsi_Host *host) {
1649 NCR5380_local_declare();
1650 unsigned char *msgptr, phase, tmp;
1651 int len;
1652 int rc;
1653 NCR5380_setup(host);
1654
1655
1656 /* Request message out phase */
1657 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1658
1659 /*
1660 * Wait for the target to indicate a valid phase by asserting
1661 * REQ. Once this happens, we'll have either a MSGOUT phase
1662 * and can immediately send the ABORT message, or we'll have some
1663 * other phase and will have to source/sink data.
1664 *
1665 * We really don't care what value was on the bus or what value
1666 * the target sees, so we just handshake.
1667 */
1668
1669 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ);
1670
1671 if(rc < 0)
1672 return -1;
1673
1674 tmp = (unsigned char)rc;
1675
1676 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1677
1678 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1679 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1680 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ);
1681 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1682 if(rc == -1)
1683 return -1;
1684 }
1685 tmp = ABORT;
1686 msgptr = &tmp;
1687 len = 1;
1688 phase = PHASE_MSGOUT;
1689 NCR5380_transfer_pio(host, &phase, &len, &msgptr);
1690
1691 /*
1692 * If we got here, and the command completed successfully,
1693 * we're about to go into bus free state.
1694 */
1695
1696 return len ? -1 : 0;
1697}
1698
1699#if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL)
1700/*
1701 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1702 * unsigned char *phase, int *count, unsigned char **data)
1703 *
1704 * Purpose : transfers data in given phase using either real
1705 * or pseudo DMA.
1706 *
1707 * Inputs : instance - instance of driver, *phase - pointer to
1708 * what phase is expected, *count - pointer to number of
1709 * bytes to transfer, **data - pointer to data pointer.
1710 *
1711 * Returns : -1 when different phase is entered without transferring
25985edc 1712 * maximum number of bytes, 0 if all bytes or transferred or exit
1da177e4
LT
1713 * is in same phase.
1714 *
1715 * Also, *phase, *count, *data are modified in place.
1716 *
1717 * Locks: io_request lock held by caller
1718 */
1719
1720
1721static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1722 NCR5380_local_declare();
1723 register int c = *count;
1724 register unsigned char p = *phase;
1725 register unsigned char *d = *data;
1726 unsigned char tmp;
1727 int foo;
1728#if defined(REAL_DMA_POLL)
1729 int cnt, toPIO;
1730 unsigned char saved_data = 0, overrun = 0, residue;
1731#endif
1732
1733 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1734
1735 NCR5380_setup(instance);
1736
1737 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1738 *phase = tmp;
1739 return -1;
1740 }
1741#if defined(REAL_DMA) || defined(REAL_DMA_POLL)
1742#ifdef READ_OVERRUNS
1743 if (p & SR_IO) {
1744 c -= 2;
1745 }
1746#endif
52a6a1cb 1747 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);
1da177e4
LT
1748 hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c);
1749#endif
1750
1751 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1752
1753#ifdef REAL_DMA
1754 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
1755#elif defined(REAL_DMA_POLL)
1756 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
1757#else
1758 /*
1759 * Note : on my sample board, watch-dog timeouts occurred when interrupts
1760 * were not disabled for the duration of a single DMA transfer, from
1761 * before the setting of DMA mode to after transfer of the last byte.
1762 */
1763
1764#if defined(PSEUDO_DMA) && defined(UNSAFE)
1765 spin_unlock_irq(instance->host_lock);
1766#endif
1767 /* KLL May need eop and parity in 53c400 */
1768 if (hostdata->flags & FLAG_NCR53C400)
085267ac
RK
1769 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE |
1770 MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR |
1771 MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
1da177e4
LT
1772 else
1773 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
1774#endif /* def REAL_DMA */
1775
52a6a1cb 1776 dprintk(NDEBUG_DMA, "scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG));
1da177e4
LT
1777
1778 /*
1779 * On the PAS16 at least I/O recovery delays are not needed here.
1780 * Everyone else seems to want them.
1781 */
1782
1783 if (p & SR_IO) {
1784 io_recovery_delay(1);
1785 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1786 } else {
1787 io_recovery_delay(1);
1788 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1789 io_recovery_delay(1);
1790 NCR5380_write(START_DMA_SEND_REG, 0);
1791 io_recovery_delay(1);
1792 }
1793
1794#if defined(REAL_DMA_POLL)
1795 do {
1796 tmp = NCR5380_read(BUS_AND_STATUS_REG);
1797 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER)));
1798
1799/*
1800 At this point, either we've completed DMA, or we have a phase mismatch,
1801 or we've unexpectedly lost BUSY (which is a real error).
1802
1803 For write DMAs, we want to wait until the last byte has been
1804 transferred out over the bus before we turn off DMA mode. Alas, there
1805 seems to be no terribly good way of doing this on a 5380 under all
1806 conditions. For non-scatter-gather operations, we can wait until REQ
1807 and ACK both go false, or until a phase mismatch occurs. Gather-writes
1808 are nastier, since the device will be expecting more data than we
1809 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
1810 could test LAST BIT SENT to assure transfer (I imagine this is precisely
1811 why this signal was added to the newer chips) but on the older 538[01]
1812 this signal does not exist. The workaround for this lack is a watchdog;
1813 we bail out of the wait-loop after a modest amount of wait-time if
1814 the usual exit conditions are not met. Not a terribly clean or
1815 correct solution :-%
1816
1817 Reads are equally tricky due to a nasty characteristic of the NCR5380.
1818 If the chip is in DMA mode for an READ, it will respond to a target's
1819 REQ by latching the SCSI data into the INPUT DATA register and asserting
1820 ACK, even if it has _already_ been notified by the DMA controller that
1821 the current DMA transfer has completed! If the NCR5380 is then taken
1822 out of DMA mode, this already-acknowledged byte is lost.
1823
1824 This is not a problem for "one DMA transfer per command" reads, because
1825 the situation will never arise... either all of the data is DMA'ed
1826 properly, or the target switches to MESSAGE IN phase to signal a
1827 disconnection (either operation bringing the DMA to a clean halt).
1828 However, in order to handle scatter-reads, we must work around the
1829 problem. The chosen fix is to DMA N-2 bytes, then check for the
1830 condition before taking the NCR5380 out of DMA mode. One or two extra
1831 bytes are transferred via PIO as necessary to fill out the original
1832 request.
1833 */
1834
1835 if (p & SR_IO) {
1836#ifdef READ_OVERRUNS
1837 udelay(10);
1838 if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) {
1839 saved_data = NCR5380_read(INPUT_DATA_REGISTER);
1840 overrun = 1;
1841 }
1842#endif
1843 } else {
1844 int limit = 100;
1845 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) {
1846 if (!(tmp & BASR_PHASE_MATCH))
1847 break;
1848 if (--limit < 0)
1849 break;
1850 }
1851 }
1852
52a6a1cb 1853 dprintk(NDEBUG_DMA, "scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG));
1da177e4
LT
1854
1855 NCR5380_write(MODE_REG, MR_BASE);
1856 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1857
1858 residue = NCR5380_dma_residual(instance);
1859 c -= residue;
1860 *count -= c;
1861 *data += c;
1862 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
1863
1864#ifdef READ_OVERRUNS
1865 if (*phase == p && (p & SR_IO) && residue == 0) {
1866 if (overrun) {
52a6a1cb 1867 dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n");
1da177e4
LT
1868 **data = saved_data;
1869 *data += 1;
1870 *count -= 1;
1871 cnt = toPIO = 1;
1872 } else {
1873 printk("No overrun??\n");
1874 cnt = toPIO = 2;
1875 }
52a6a1cb 1876 dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%X\n", cnt, *data);
1da177e4
LT
1877 NCR5380_transfer_pio(instance, phase, &cnt, data);
1878 *count -= toPIO - cnt;
1879 }
1880#endif
1881
52a6a1cb 1882 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));
1da177e4
LT
1883 return 0;
1884
1885#elif defined(REAL_DMA)
1886 return 0;
1887#else /* defined(REAL_DMA_POLL) */
1888 if (p & SR_IO) {
1889#ifdef DMA_WORKS_RIGHT
1890 foo = NCR5380_pread(instance, d, c);
1891#else
1892 int diff = 1;
1893 if (hostdata->flags & FLAG_NCR53C400) {
1894 diff = 0;
1895 }
1896 if (!(foo = NCR5380_pread(instance, d, c - diff))) {
1897 /*
1898 * We can't disable DMA mode after successfully transferring
1899 * what we plan to be the last byte, since that would open up
1900 * a race condition where if the target asserted REQ before
1901 * we got the DMA mode reset, the NCR5380 would have latched
1902 * an additional byte into the INPUT DATA register and we'd
1903 * have dropped it.
1904 *
1905 * The workaround was to transfer one fewer bytes than we
1906 * intended to with the pseudo-DMA read function, wait for
1907 * the chip to latch the last byte, read it, and then disable
1908 * pseudo-DMA mode.
1909 *
1910 * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
1911 * REQ is deasserted when ACK is asserted, and not reasserted
1912 * until ACK goes false. Since the NCR5380 won't lower ACK
1913 * until DACK is asserted, which won't happen unless we twiddle
1914 * the DMA port or we take the NCR5380 out of DMA mode, we
1915 * can guarantee that we won't handshake another extra
1916 * byte.
1917 */
1918
1919 if (!(hostdata->flags & FLAG_NCR53C400)) {
1920 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ));
1921 /* Wait for clean handshake */
1922 while (NCR5380_read(STATUS_REG) & SR_REQ);
1923 d[c - 1] = NCR5380_read(INPUT_DATA_REG);
1924 }
1925 }
1926#endif
1927 } else {
1928#ifdef DMA_WORKS_RIGHT
1929 foo = NCR5380_pwrite(instance, d, c);
1930#else
1931 int timeout;
52a6a1cb 1932 dprintk(NDEBUG_C400_PWRITE, "About to pwrite %d bytes\n", c);
1da177e4
LT
1933 if (!(foo = NCR5380_pwrite(instance, d, c))) {
1934 /*
1935 * Wait for the last byte to be sent. If REQ is being asserted for
1936 * the byte we're interested, we'll ACK it and it will go false.
1937 */
1938 if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) {
1939 timeout = 20000;
1940 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH));
1941
1942 if (!timeout)
52a6a1cb 1943 dprintk(NDEBUG_LAST_BYTE_SENT, "scsi%d : timed out on last byte\n", instance->host_no);
1da177e4
LT
1944
1945 if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) {
1946 hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT;
1947 if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) {
1948 hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT;
52a6a1cb 1949 dprintk(NDEBUG_LAST_BYTE_SENT, "scsi%d : last byte sent works\n", instance->host_no);
1da177e4
LT
1950 }
1951 }
1952 } else {
52a6a1cb 1953 dprintk(NDEBUG_C400_PWRITE, "Waiting for LASTBYTE\n");
1da177e4 1954 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT));
52a6a1cb 1955 dprintk(NDEBUG_C400_PWRITE, "Got LASTBYTE\n");
1da177e4
LT
1956 }
1957 }
1958#endif
1959 }
1960 NCR5380_write(MODE_REG, MR_BASE);
1961 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1962
1963 if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) {
52a6a1cb 1964 dprintk(NDEBUG_C400_PWRITE, "53C400w: Checking for IRQ\n");
1da177e4 1965 if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) {
52a6a1cb 1966 dprintk(NDEBUG_C400_PWRITE, "53C400w: got it, reading reset interrupt reg\n");
1da177e4
LT
1967 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1968 } else {
1969 printk("53C400w: IRQ NOT THERE!\n");
1970 }
1971 }
1972 *data = d + c;
1973 *count = 0;
1974 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
1975#if defined(PSEUDO_DMA) && defined(UNSAFE)
1976 spin_lock_irq(instance->host_lock);
1977#endif /* defined(REAL_DMA_POLL) */
1978 return foo;
1979#endif /* def REAL_DMA */
1980}
1981#endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */
1982
1983/*
1984 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1985 *
1986 * Purpose : run through the various SCSI phases and do as the target
1987 * directs us to. Operates on the currently connected command,
1988 * instance->connected.
1989 *
1990 * Inputs : instance, instance for which we are doing commands
1991 *
1992 * Side effects : SCSI things happen, the disconnected queue will be
1993 * modified if a command disconnects, *instance->connected will
1994 * change.
1995 *
1996 * XXX Note : we need to watch for bus free or a reset condition here
1997 * to recover from an unexpected bus free condition.
1998 *
1999 * Locks: io_request_lock held by caller in IRQ mode
2000 */
2001
2002static void NCR5380_information_transfer(struct Scsi_Host *instance) {
2003 NCR5380_local_declare();
2004 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata;
2005 unsigned char msgout = NOP;
2006 int sink = 0;
2007 int len;
2008#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2009 int transfersize;
2010#endif
2011 unsigned char *data;
2012 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
710ddd0d 2013 struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected;
1da177e4
LT
2014 /* RvC: we need to set the end of the polling time */
2015 unsigned long poll_time = jiffies + USLEEP_POLL;
2016
2017 NCR5380_setup(instance);
2018
2019 while (1) {
2020 tmp = NCR5380_read(STATUS_REG);
2021 /* We only have a valid SCSI phase when REQ is asserted */
2022 if (tmp & SR_REQ) {
2023 phase = (tmp & PHASE_MASK);
2024 if (phase != old_phase) {
2025 old_phase = phase;
2026 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance);
2027 }
2028 if (sink && (phase != PHASE_MSGOUT)) {
2029 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2030
2031 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
2032 while (NCR5380_read(STATUS_REG) & SR_REQ);
2033 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2034 sink = 0;
2035 continue;
2036 }
2037 switch (phase) {
2038 case PHASE_DATAIN:
2039 case PHASE_DATAOUT:
2040#if (NDEBUG & NDEBUG_NO_DATAOUT)
2041 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no);
2042 sink = 1;
2043 do_abort(instance);
2044 cmd->result = DID_ERROR << 16;
cce99c69 2045 cmd->scsi_done(cmd);
1da177e4
LT
2046 return;
2047#endif
2048 /*
2049 * If there is no room left in the current buffer in the
2050 * scatter-gather list, move onto the next one.
2051 */
2052
2053 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2054 ++cmd->SCp.buffer;
2055 --cmd->SCp.buffers_residual;
2056 cmd->SCp.this_residual = cmd->SCp.buffer->length;
45711f1a 2057 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
52a6a1cb 2058 dprintk(NDEBUG_INFORMATION, "scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual);
1da177e4
LT
2059 }
2060 /*
2061 * The preferred transfer method is going to be
2062 * PSEUDO-DMA for systems that are strictly PIO,
2063 * since we can let the hardware do the handshaking.
2064 *
2065 * For this to work, we need to know the transfersize
2066 * ahead of time, since the pseudo-DMA code will sit
2067 * in an unconditional loop.
2068 */
2069
2070#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2071 /* KLL
2072 * PSEUDO_DMA is defined here. If this is the g_NCR5380
2073 * driver then it will always be defined, so the
2074 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
2075 * NCR5380 case. I think this is a fairly clean solution.
2076 * We supplement these 2 if's with the flag.
2077 */
2078#ifdef NCR5380_dma_xfer_len
2079 if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) {
2080#else
2081 transfersize = cmd->transfersize;
2082
2083#ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */
2084 if (transfersize > 512)
2085 transfersize = 512;
2086#endif /* LIMIT_TRANSFERSIZE */
2087
2088 if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) {
2089 /* Limit transfers to 32K, for xx400 & xx406
2090 * pseudoDMA that transfers in 128 bytes blocks. */
2091 if (transfersize > 32 * 1024)
2092 transfersize = 32 * 1024;
2093#endif
2094 len = transfersize;
2095 if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) {
2096 /*
2097 * If the watchdog timer fires, all future accesses to this
2098 * device will use the polled-IO.
2099 */
017560fc
JG
2100 scmd_printk(KERN_INFO, cmd,
2101 "switching to slow handshake\n");
1da177e4
LT
2102 cmd->device->borken = 1;
2103 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2104 sink = 1;
2105 do_abort(instance);
2106 cmd->result = DID_ERROR << 16;
cce99c69 2107 cmd->scsi_done(cmd);
1da177e4
LT
2108 /* XXX - need to source or sink data here, as appropriate */
2109 } else
2110 cmd->SCp.this_residual -= transfersize - len;
2111 } else
2112#endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */
2113 NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **)
2114 &cmd->SCp.ptr);
2115 break;
2116 case PHASE_MSGIN:
2117 len = 1;
2118 data = &tmp;
2119 NCR5380_transfer_pio(instance, &phase, &len, &data);
2120 cmd->SCp.Message = tmp;
2121
2122 switch (tmp) {
2123 /*
2124 * Linking lets us reduce the time required to get the
2125 * next command out to the device, hopefully this will
2126 * mean we don't waste another revolution due to the delays
2127 * required by ARBITRATION and another SELECTION.
2128 *
2129 * In the current implementation proposal, low level drivers
2130 * merely have to start the next command, pointed to by
2131 * next_link, done() is called as with unlinked commands.
2132 */
2133#ifdef LINKED
2134 case LINKED_CMD_COMPLETE:
2135 case LINKED_FLG_CMD_COMPLETE:
2136 /* Accept message by clearing ACK */
2137 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
9cb78c16 2138 dprintk(NDEBUG_LINKED, "scsi%d : target %d lun %llu linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun);
1da177e4
LT
2139 /*
2140 * Sanity check : A linked command should only terminate with
2141 * one of these messages if there are more linked commands
2142 * available.
2143 */
2144 if (!cmd->next_link) {
9cb78c16 2145 printk("scsi%d : target %d lun %llu linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun);
1da177e4
LT
2146 sink = 1;
2147 do_abort(instance);
2148 return;
2149 }
2150 initialize_SCp(cmd->next_link);
2151 /* The next command is still part of this process */
2152 cmd->next_link->tag = cmd->tag;
2153 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
9cb78c16 2154 dprintk(NDEBUG_LINKED, "scsi%d : target %d lun %llu linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun);
1da177e4
LT
2155 cmd->scsi_done(cmd);
2156 cmd = hostdata->connected;
2157 break;
2158#endif /* def LINKED */
2159 case ABORT:
2160 case COMMAND_COMPLETE:
2161 /* Accept message by clearing ACK */
2162 sink = 1;
2163 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2164 hostdata->connected = NULL;
9cb78c16
HR
2165 dprintk(NDEBUG_QUEUES, "scsi%d : command for target %d, lun %llu completed\n", instance->host_no, cmd->device->id, cmd->device->lun);
2166 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xFF));
1da177e4
LT
2167
2168 /*
2169 * I'm not sure what the correct thing to do here is :
2170 *
2171 * If the command that just executed is NOT a request
2172 * sense, the obvious thing to do is to set the result
2173 * code to the values of the stored parameters.
2174 *
2175 * If it was a REQUEST SENSE command, we need some way
2176 * to differentiate between the failure code of the original
2177 * and the failure code of the REQUEST sense - the obvious
2178 * case is success, where we fall through and leave the result
2179 * code unchanged.
2180 *
2181 * The non-obvious place is where the REQUEST SENSE failed
2182 */
2183
2184 if (cmd->cmnd[0] != REQUEST_SENSE)
2185 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2186 else if (status_byte(cmd->SCp.Status) != GOOD)
2187 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2188
28424d3a
BH
2189 if ((cmd->cmnd[0] == REQUEST_SENSE) &&
2190 hostdata->ses.cmd_len) {
2191 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
2192 hostdata->ses.cmd_len = 0 ;
2193 }
2194
1da177e4 2195 if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
28424d3a
BH
2196 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
2197
52a6a1cb 2198 dprintk(NDEBUG_AUTOSENSE, "scsi%d : performing request sense\n", instance->host_no);
1da177e4
LT
2199
2200 LIST(cmd, hostdata->issue_queue);
2201 cmd->host_scribble = (unsigned char *)
2202 hostdata->issue_queue;
710ddd0d 2203 hostdata->issue_queue = (struct scsi_cmnd *) cmd;
52a6a1cb 2204 dprintk(NDEBUG_QUEUES, "scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no);
997acab7 2205 } else {
1da177e4
LT
2206 cmd->scsi_done(cmd);
2207 }
2208
2209 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2210 /*
2211 * Restore phase bits to 0 so an interrupted selection,
2212 * arbitration can resume.
2213 */
2214 NCR5380_write(TARGET_COMMAND_REG, 0);
2215
2216 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2217 barrier();
2218 return;
2219 case MESSAGE_REJECT:
2220 /* Accept message by clearing ACK */
2221 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2222 switch (hostdata->last_message) {
2223 case HEAD_OF_QUEUE_TAG:
2224 case ORDERED_QUEUE_TAG:
2225 case SIMPLE_QUEUE_TAG:
2226 cmd->device->simple_tags = 0;
9cb78c16 2227 hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF));
1da177e4
LT
2228 break;
2229 default:
2230 break;
2231 }
2232 case DISCONNECT:{
2233 /* Accept message by clearing ACK */
2234 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2235 cmd->device->disconnect = 1;
2236 LIST(cmd, hostdata->disconnected_queue);
2237 cmd->host_scribble = (unsigned char *)
2238 hostdata->disconnected_queue;
2239 hostdata->connected = NULL;
2240 hostdata->disconnected_queue = cmd;
9cb78c16 2241 dprintk(NDEBUG_QUEUES, "scsi%d : command for target %d lun %llu was moved from connected to" " the disconnected_queue\n", instance->host_no, cmd->device->id, cmd->device->lun);
1da177e4
LT
2242 /*
2243 * Restore phase bits to 0 so an interrupted selection,
2244 * arbitration can resume.
2245 */
2246 NCR5380_write(TARGET_COMMAND_REG, 0);
2247
2248 /* Enable reselect interrupts */
2249 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2250 /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/
2251 /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */
2252 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2253 barrier();
2254 return;
2255 }
2256 /*
2257 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2258 * operation, in violation of the SCSI spec so we can safely
2259 * ignore SAVE/RESTORE pointers calls.
2260 *
2261 * Unfortunately, some disks violate the SCSI spec and
2262 * don't issue the required SAVE_POINTERS message before
2263 * disconnecting, and we have to break spec to remain
2264 * compatible.
2265 */
2266 case SAVE_POINTERS:
2267 case RESTORE_POINTERS:
2268 /* Accept message by clearing ACK */
2269 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2270 break;
2271 case EXTENDED_MESSAGE:
2272/*
2273 * Extended messages are sent in the following format :
2274 * Byte
2275 * 0 EXTENDED_MESSAGE == 1
2276 * 1 length (includes one byte for code, doesn't
2277 * include first two bytes)
2278 * 2 code
2279 * 3..length+1 arguments
2280 *
2281 * Start the extended message buffer with the EXTENDED_MESSAGE
1abfd370 2282 * byte, since spi_print_msg() wants the whole thing.
1da177e4
LT
2283 */
2284 extended_msg[0] = EXTENDED_MESSAGE;
2285 /* Accept first byte by clearing ACK */
2286 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
52a6a1cb 2287 dprintk(NDEBUG_EXTENDED, "scsi%d : receiving extended message\n", instance->host_no);
1da177e4
LT
2288
2289 len = 2;
2290 data = extended_msg + 1;
2291 phase = PHASE_MSGIN;
2292 NCR5380_transfer_pio(instance, &phase, &len, &data);
2293
52a6a1cb 2294 dprintk(NDEBUG_EXTENDED, "scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2]);
1da177e4
LT
2295
2296 if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) {
2297 /* Accept third byte by clearing ACK */
2298 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2299 len = extended_msg[1] - 1;
2300 data = extended_msg + 3;
2301 phase = PHASE_MSGIN;
2302
2303 NCR5380_transfer_pio(instance, &phase, &len, &data);
52a6a1cb 2304 dprintk(NDEBUG_EXTENDED, "scsi%d : message received, residual %d\n", instance->host_no, len);
1da177e4
LT
2305
2306 switch (extended_msg[2]) {
2307 case EXTENDED_SDTR:
2308 case EXTENDED_WDTR:
2309 case EXTENDED_MODIFY_DATA_POINTER:
2310 case EXTENDED_EXTENDED_IDENTIFY:
2311 tmp = 0;
2312 }
2313 } else if (len) {
2314 printk("scsi%d: error receiving extended message\n", instance->host_no);
2315 tmp = 0;
2316 } else {
2317 printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]);
2318 tmp = 0;
2319 }
2320 /* Fall through to reject message */
2321
2322 /*
2323 * If we get something weird that we aren't expecting,
2324 * reject it.
2325 */
2326 default:
2327 if (!tmp) {
2328 printk("scsi%d: rejecting message ", instance->host_no);
1abfd370 2329 spi_print_msg(extended_msg);
1da177e4
LT
2330 printk("\n");
2331 } else if (tmp != EXTENDED_MESSAGE)
017560fc
JG
2332 scmd_printk(KERN_INFO, cmd,
2333 "rejecting unknown message %02x\n",tmp);
1da177e4 2334 else
017560fc
JG
2335 scmd_printk(KERN_INFO, cmd,
2336 "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]);
1da177e4
LT
2337
2338 msgout = MESSAGE_REJECT;
2339 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2340 break;
2341 } /* switch (tmp) */
2342 break;
2343 case PHASE_MSGOUT:
2344 len = 1;
2345 data = &msgout;
2346 hostdata->last_message = msgout;
2347 NCR5380_transfer_pio(instance, &phase, &len, &data);
2348 if (msgout == ABORT) {
9cb78c16 2349 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xFF));
1da177e4
LT
2350 hostdata->connected = NULL;
2351 cmd->result = DID_ERROR << 16;
1da177e4
LT
2352 cmd->scsi_done(cmd);
2353 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2354 return;
2355 }
2356 msgout = NOP;
2357 break;
2358 case PHASE_CMDOUT:
2359 len = cmd->cmd_len;
2360 data = cmd->cmnd;
2361 /*
2362 * XXX for performance reasons, on machines with a
2363 * PSEUDO-DMA architecture we should probably
2364 * use the dma transfer function.
2365 */
2366 NCR5380_transfer_pio(instance, &phase, &len, &data);
2367 if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) {
2368 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
52a6a1cb 2369 dprintk(NDEBUG_USLEEP, "scsi%d : issued command, sleeping until %lu\n", instance->host_no, hostdata->time_expires);
1da177e4
LT
2370 return;
2371 }
2372 break;
2373 case PHASE_STATIN:
2374 len = 1;
2375 data = &tmp;
2376 NCR5380_transfer_pio(instance, &phase, &len, &data);
2377 cmd->SCp.Status = tmp;
2378 break;
2379 default:
2380 printk("scsi%d : unknown phase\n", instance->host_no);
4dde8f7d 2381 NCR5380_dprint(NDEBUG_ANY, instance);
1da177e4
LT
2382 } /* switch(phase) */
2383 } /* if (tmp * SR_REQ) */
2384 else {
2385 /* RvC: go to sleep if polling time expired
2386 */
2387 if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) {
2388 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
52a6a1cb 2389 dprintk(NDEBUG_USLEEP, "scsi%d : poll timed out, sleeping until %lu\n", instance->host_no, hostdata->time_expires);
1da177e4
LT
2390 return;
2391 }
2392 }
2393 } /* while (1) */
2394}
2395
2396/*
2397 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2398 *
2399 * Purpose : does reselection, initializing the instance->connected
710ddd0d 2400 * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q
1da177e4
LT
2401 * nexus has been reestablished,
2402 *
2403 * Inputs : instance - this instance of the NCR5380.
2404 *
2405 * Locks: io_request_lock held by caller if IRQ driven
2406 */
2407
2408static void NCR5380_reselect(struct Scsi_Host *instance) {
2409 NCR5380_local_declare();
2410 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
2411 instance->hostdata;
2412 unsigned char target_mask;
2413 unsigned char lun, phase;
2414 int len;
2415 unsigned char msg[3];
2416 unsigned char *data;
710ddd0d 2417 struct scsi_cmnd *tmp = NULL, *prev;
1da177e4
LT
2418 int abort = 0;
2419 NCR5380_setup(instance);
2420
2421 /*
2422 * Disable arbitration, etc. since the host adapter obviously
2423 * lost, and tell an interrupted NCR5380_select() to restart.
2424 */
2425
2426 NCR5380_write(MODE_REG, MR_BASE);
2427 hostdata->restart_select = 1;
2428
2429 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
52a6a1cb 2430 dprintk(NDEBUG_SELECTION, "scsi%d : reselect\n", instance->host_no);
1da177e4
LT
2431
2432 /*
2433 * At this point, we have detected that our SCSI ID is on the bus,
2434 * SEL is true and BSY was false for at least one bus settle delay
2435 * (400 ns).
2436 *
2437 * We must assert BSY ourselves, until the target drops the SEL
2438 * signal.
2439 */
2440
2441 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2442
2443 /* FIXME: timeout too long, must fail to workqueue */
2444 if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0)
2445 abort = 1;
2446
2447 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2448
2449 /*
2450 * Wait for target to go into MSGIN.
2451 * FIXME: timeout needed and fail to work queeu
2452 */
2453
2454 if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ))
2455 abort = 1;
2456
2457 len = 1;
2458 data = msg;
2459 phase = PHASE_MSGIN;
2460 NCR5380_transfer_pio(instance, &phase, &len, &data);
2461
2462 if (!(msg[0] & 0x80)) {
2463 printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no);
1abfd370 2464 spi_print_msg(msg);
1da177e4
LT
2465 abort = 1;
2466 } else {
2467 /* Accept message by clearing ACK */
2468 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2469 lun = (msg[0] & 0x07);
2470
2471 /*
2472 * We need to add code for SCSI-II to track which devices have
2473 * I_T_L_Q nexuses established, and which have simple I_T_L
2474 * nexuses so we can chose to do additional data transfer.
2475 */
2476
2477 /*
2478 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2479 * just reestablished, and remove it from the disconnected queue.
2480 */
2481
2482
710ddd0d 2483 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (struct scsi_cmnd *) tmp->host_scribble)
9cb78c16 2484 if ((target_mask == (1 << tmp->device->id)) && (lun == (u8)tmp->device->lun)
1da177e4
LT
2485 ) {
2486 if (prev) {
2487 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
2488 prev->host_scribble = tmp->host_scribble;
2489 } else {
2490 REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble);
710ddd0d 2491 hostdata->disconnected_queue = (struct scsi_cmnd *) tmp->host_scribble;
1da177e4
LT
2492 }
2493 tmp->host_scribble = NULL;
2494 break;
2495 }
2496 if (!tmp) {
2497 printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun);
2498 /*
2499 * Since we have an established nexus that we can't do anything with,
2500 * we must abort it.
2501 */
2502 abort = 1;
2503 }
2504 }
2505
2506 if (abort) {
2507 do_abort(instance);
2508 } else {
2509 hostdata->connected = tmp;
9cb78c16 2510 dprintk(NDEBUG_RESELECTION, "scsi%d : nexus established, target = %d, lun = %llu, tag = %d\n", instance->host_no, tmp->device->id, tmp->device->lun, tmp->tag);
1da177e4
LT
2511 }
2512}
2513
2514/*
2515 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
2516 *
2517 * Purpose : called by interrupt handler when DMA finishes or a phase
2518 * mismatch occurs (which would finish the DMA transfer).
2519 *
2520 * Inputs : instance - this instance of the NCR5380.
2521 *
710ddd0d 2522 * Returns : pointer to the scsi_cmnd structure for which the I_T_L
1da177e4
LT
2523 * nexus has been reestablished, on failure NULL is returned.
2524 */
2525
2526#ifdef REAL_DMA
2527static void NCR5380_dma_complete(NCR5380_instance * instance) {
2528 NCR5380_local_declare();
f8343685 2529 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1da177e4
LT
2530 int transferred;
2531 NCR5380_setup(instance);
2532
2533 /*
2534 * XXX this might not be right.
2535 *
2536 * Wait for final byte to transfer, ie wait for ACK to go false.
2537 *
2538 * We should use the Last Byte Sent bit, unfortunately this is
2539 * not available on the 5380/5381 (only the various CMOS chips)
2540 *
2541 * FIXME: timeout, and need to handle long timeout/irq case
2542 */
2543
2544 NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ);
2545
2546 NCR5380_write(MODE_REG, MR_BASE);
2547 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2548
2549 /*
2550 * The only places we should see a phase mismatch and have to send
2551 * data from the same set of pointers will be the data transfer
2552 * phases. So, residual, requested length are only important here.
2553 */
2554
2555 if (!(hostdata->connected->SCp.phase & SR_CD)) {
2556 transferred = instance->dmalen - NCR5380_dma_residual();
2557 hostdata->connected->SCp.this_residual -= transferred;
2558 hostdata->connected->SCp.ptr += transferred;
2559 }
2560}
2561#endif /* def REAL_DMA */
2562
2563/*
710ddd0d 2564 * Function : int NCR5380_abort (struct scsi_cmnd *cmd)
1da177e4
LT
2565 *
2566 * Purpose : abort a command
2567 *
710ddd0d 2568 * Inputs : cmd - the scsi_cmnd to abort, code - code to set the
b6c92b7e 2569 * host byte of the result field to, if zero DID_ABORTED is
1da177e4
LT
2570 * used.
2571 *
b6c92b7e 2572 * Returns : SUCCESS - success, FAILED on failure.
1da177e4 2573 *
b6c92b7e
HR
2574 * XXX - there is no way to abort the command that is currently
2575 * connected, you have to wait for it to complete. If this is
1da177e4
LT
2576 * a problem, we could implement longjmp() / setjmp(), setjmp()
2577 * called where the loop started in NCR5380_main().
2578 *
2579 * Locks: host lock taken by caller
2580 */
2581
710ddd0d
FT
2582static int NCR5380_abort(struct scsi_cmnd *cmd)
2583{
1da177e4
LT
2584 NCR5380_local_declare();
2585 struct Scsi_Host *instance = cmd->device->host;
2586 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
710ddd0d 2587 struct scsi_cmnd *tmp, **prev;
1fa6b5fb
HR
2588
2589 scmd_printk(KERN_WARNING, cmd, "aborting command\n");
1da177e4
LT
2590
2591 NCR5380_print_status(instance);
2592
2593 NCR5380_setup(instance);
2594
52a6a1cb
FT
2595 dprintk(NDEBUG_ABORT, "scsi%d : abort called\n", instance->host_no);
2596 dprintk(NDEBUG_ABORT, " basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG));
1da177e4
LT
2597
2598#if 0
2599/*
2600 * Case 1 : If the command is the currently executing command,
2601 * we'll set the aborted flag and return control so that
2602 * information transfer routine can exit cleanly.
2603 */
2604
2605 if (hostdata->connected == cmd) {
52a6a1cb 2606 dprintk(NDEBUG_ABORT, "scsi%d : aborting connected command\n", instance->host_no);
1da177e4
LT
2607 hostdata->aborted = 1;
2608/*
2609 * We should perform BSY checking, and make sure we haven't slipped
2610 * into BUS FREE.
2611 */
2612
2613 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN);
2614/*
2615 * Since we can't change phases until we've completed the current
2616 * handshake, we have to source or sink a byte of data if the current
2617 * phase is not MSGOUT.
2618 */
2619
2620/*
2621 * Return control to the executing NCR drive so we can clear the
2622 * aborted flag and get back into our main loop.
2623 */
2624
b6c92b7e 2625 return SUCCESS;
1da177e4
LT
2626 }
2627#endif
2628
2629/*
2630 * Case 2 : If the command hasn't been issued yet, we simply remove it
2631 * from the issue queue.
2632 */
2633
52a6a1cb 2634 dprintk(NDEBUG_ABORT, "scsi%d : abort going into loop.\n", instance->host_no);
710ddd0d 2635 for (prev = (struct scsi_cmnd **) &(hostdata->issue_queue), tmp = (struct scsi_cmnd *) hostdata->issue_queue; tmp; prev = (struct scsi_cmnd **) &(tmp->host_scribble), tmp = (struct scsi_cmnd *) tmp->host_scribble)
1da177e4
LT
2636 if (cmd == tmp) {
2637 REMOVE(5, *prev, tmp, tmp->host_scribble);
710ddd0d 2638 (*prev) = (struct scsi_cmnd *) tmp->host_scribble;
1da177e4
LT
2639 tmp->host_scribble = NULL;
2640 tmp->result = DID_ABORT << 16;
52a6a1cb 2641 dprintk(NDEBUG_ABORT, "scsi%d : abort removed command from issue queue.\n", instance->host_no);
cce99c69 2642 tmp->scsi_done(tmp);
1da177e4
LT
2643 return SUCCESS;
2644 }
2645#if (NDEBUG & NDEBUG_ABORT)
2646 /* KLL */
2647 else if (prev == tmp)
2648 printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no);
2649#endif
2650
2651/*
2652 * Case 3 : If any commands are connected, we're going to fail the abort
2653 * and let the high level SCSI driver retry at a later time or
2654 * issue a reset.
2655 *
2656 * Timeouts, and therefore aborted commands, will be highly unlikely
2657 * and handling them cleanly in this situation would make the common
2658 * case of noresets less efficient, and would pollute our code. So,
2659 * we fail.
2660 */
2661
2662 if (hostdata->connected) {
52a6a1cb 2663 dprintk(NDEBUG_ABORT, "scsi%d : abort failed, command connected.\n", instance->host_no);
1da177e4
LT
2664 return FAILED;
2665 }
2666/*
2667 * Case 4: If the command is currently disconnected from the bus, and
2668 * there are no connected commands, we reconnect the I_T_L or
2669 * I_T_L_Q nexus associated with it, go into message out, and send
2670 * an abort message.
2671 *
2672 * This case is especially ugly. In order to reestablish the nexus, we
2673 * need to call NCR5380_select(). The easiest way to implement this
2674 * function was to abort if the bus was busy, and let the interrupt
2675 * handler triggered on the SEL for reselect take care of lost arbitrations
2676 * where necessary, meaning interrupts need to be enabled.
2677 *
2678 * When interrupts are enabled, the queues may change - so we
2679 * can't remove it from the disconnected queue before selecting it
2680 * because that could cause a failure in hashing the nexus if that
2681 * device reselected.
2682 *
2683 * Since the queues may change, we can't use the pointers from when we
2684 * first locate it.
2685 *
2686 * So, we must first locate the command, and if NCR5380_select()
2687 * succeeds, then issue the abort, relocate the command and remove
2688 * it from the disconnected queue.
2689 */
2690
710ddd0d 2691 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp; tmp = (struct scsi_cmnd *) tmp->host_scribble)
1da177e4 2692 if (cmd == tmp) {
52a6a1cb 2693 dprintk(NDEBUG_ABORT, "scsi%d : aborting disconnected command.\n", instance->host_no);
1da177e4 2694
76f13b93 2695 if (NCR5380_select(instance, cmd))
1da177e4 2696 return FAILED;
52a6a1cb 2697 dprintk(NDEBUG_ABORT, "scsi%d : nexus reestablished.\n", instance->host_no);
1da177e4
LT
2698
2699 do_abort(instance);
2700
710ddd0d 2701 for (prev = (struct scsi_cmnd **) &(hostdata->disconnected_queue), tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp; prev = (struct scsi_cmnd **) &(tmp->host_scribble), tmp = (struct scsi_cmnd *) tmp->host_scribble)
1da177e4
LT
2702 if (cmd == tmp) {
2703 REMOVE(5, *prev, tmp, tmp->host_scribble);
710ddd0d 2704 *prev = (struct scsi_cmnd *) tmp->host_scribble;
1da177e4
LT
2705 tmp->host_scribble = NULL;
2706 tmp->result = DID_ABORT << 16;
cce99c69 2707 tmp->scsi_done(tmp);
1da177e4
LT
2708 return SUCCESS;
2709 }
2710 }
2711/*
2712 * Case 5 : If we reached this point, the command was not found in any of
2713 * the queues.
2714 *
2715 * We probably reached this point because of an unlikely race condition
2716 * between the command completing successfully and the abortion code,
2717 * so we won't panic, but we will notify the user in case something really
2718 * broke.
2719 */
2720 printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n"
2721 " before abortion\n", instance->host_no);
2722 return FAILED;
2723}
2724
2725
2726/*
710ddd0d 2727 * Function : int NCR5380_bus_reset (struct scsi_cmnd *cmd)
1da177e4
LT
2728 *
2729 * Purpose : reset the SCSI bus.
2730 *
2731 * Returns : SUCCESS
2732 *
2733 * Locks: host lock taken by caller
2734 */
2735
710ddd0d 2736static int NCR5380_bus_reset(struct scsi_cmnd *cmd)
68b3aa7c
JG
2737{
2738 struct Scsi_Host *instance = cmd->device->host;
2739
1da177e4 2740 NCR5380_local_declare();
68b3aa7c
JG
2741 NCR5380_setup(instance);
2742 NCR5380_print_status(instance);
2743
2744 spin_lock_irq(instance->host_lock);
2745 do_reset(instance);
2746 spin_unlock_irq(instance->host_lock);
1da177e4 2747
1da177e4
LT
2748 return SUCCESS;
2749}