blob: d40ba0bd68a3b776699f62ff56e9b9ba89059950 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * NCR 5380 generic driver routines. These should make it *trivial*
3 * to implement 5380 SCSI drivers under Linux with a non-trantor
4 * architecture.
5 *
6 * Note that these routines also work with NR53c400 family chips.
7 *
8 * Copyright 1993, Drew Eckhardt
9 * Visionary Computing
10 * (Unix and Linux consulting and custom programming)
11 * drew@colorado.edu
12 * +1 (303) 666-5836
13 *
14 * DISTRIBUTION RELEASE 6.
15 *
16 * For more information, please consult
17 *
18 * NCR 5380 Family
19 * SCSI Protocol Controller
20 * Databook
21 *
22 * NCR Microelectronics
23 * 1635 Aeroplaza Drive
24 * Colorado Springs, CO 80916
25 * 1+ (719) 578-3400
26 * 1+ (800) 334-5454
27 */
28
29/*
30 * $Log: NCR5380.c,v $
31
32 * Revision 1.10 1998/9/2 Alan Cox
33 * (alan@redhat.com)
34 * Fixed up the timer lockups reported so far. Things still suck. Looking
35 * forward to 2.3 and per device request queues. Then it'll be possible to
36 * SMP thread this beast and improve life no end.
37
38 * Revision 1.9 1997/7/27 Ronald van Cuijlenborg
39 * (ronald.van.cuijlenborg@tip.nl or nutty@dds.nl)
40 * (hopefully) fixed and enhanced USLEEP
41 * added support for DTC3181E card (for Mustek scanner)
42 *
43
44 * Revision 1.8 Ingmar Baumgart
45 * (ingmar@gonzo.schwaben.de)
46 * added support for NCR53C400a card
47 *
48
49 * Revision 1.7 1996/3/2 Ray Van Tassle (rayvt@comm.mot.com)
50 * added proc_info
51 * added support needed for DTC 3180/3280
52 * fixed a couple of bugs
53 *
54
55 * Revision 1.5 1994/01/19 09:14:57 drew
56 * Fixed udelay() hack that was being used on DATAOUT phases
57 * instead of a proper wait for the final handshake.
58 *
59 * Revision 1.4 1994/01/19 06:44:25 drew
60 * *** empty log message ***
61 *
62 * Revision 1.3 1994/01/19 05:24:40 drew
63 * Added support for TCR LAST_BYTE_SENT bit.
64 *
65 * Revision 1.2 1994/01/15 06:14:11 drew
66 * REAL DMA support, bug fixes.
67 *
68 * Revision 1.1 1994/01/15 06:00:54 drew
69 * Initial revision
70 *
71 */
72
73/*
74 * Further development / testing that should be done :
75 * 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete
76 * code so that everything does the same thing that's done at the
77 * end of a pseudo-DMA read operation.
78 *
79 * 2. Fix REAL_DMA (interrupt driven, polled works fine) -
80 * basically, transfer size needs to be reduced by one
81 * and the last byte read as is done with PSEUDO_DMA.
82 *
83 * 4. Test SCSI-II tagged queueing (I have no devices which support
84 * tagged queueing)
85 *
86 * 5. Test linked command handling code after Eric is ready with
87 * the high level code.
88 */
db9dff32005-04-03 14:53:59 -050089#include <scsi/scsi_dbg.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
viro@ZenIV.linux.org.uk185a7a12005-09-07 23:18:24 +010091#ifndef NDEBUG
92#define NDEBUG 0
93#endif
94#ifndef NDEBUG
95#define NDEBUG_ABORT 0
96#endif
97
Linus Torvalds1da177e2005-04-16 15:20:36 -070098#if (NDEBUG & NDEBUG_LISTS)
99#define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); }
100#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); }
101#else
102#define LIST(x,y)
103#define REMOVE(w,x,y,z)
104#endif
105
106#ifndef notyet
107#undef LINKED
108#undef REAL_DMA
109#endif
110
111#ifdef REAL_DMA_POLL
112#undef READ_OVERRUNS
113#define READ_OVERRUNS
114#endif
115
116#ifdef BOARD_REQUIRES_NO_DELAY
117#define io_recovery_delay(x)
118#else
119#define io_recovery_delay(x) udelay(x)
120#endif
121
122/*
123 * Design
124 *
125 * This is a generic 5380 driver. To use it on a different platform,
126 * one simply writes appropriate system specific macros (ie, data
127 * transfer - some PC's will use the I/O bus, 68K's must use
128 * memory mapped) and drops this file in their 'C' wrapper.
129 *
130 * (Note from hch: unfortunately it was not enough for the different
131 * m68k folks and instead of improving this driver they copied it
132 * and hacked it up for their needs. As a consequence they lost
133 * most updates to this driver. Maybe someone will fix all these
134 * drivers to use a common core one day..)
135 *
136 * As far as command queueing, two queues are maintained for
137 * each 5380 in the system - commands that haven't been issued yet,
138 * and commands that are currently executing. This means that an
139 * unlimited number of commands may be queued, letting
140 * more commands propagate from the higher driver levels giving higher
141 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
142 * allowing multiple commands to propagate all the way to a SCSI-II device
143 * while a command is already executing.
144 *
145 *
146 * Issues specific to the NCR5380 :
147 *
148 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
149 * piece of hardware that requires you to sit in a loop polling for
150 * the REQ signal as long as you are connected. Some devices are
151 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
152 * while doing long seek operations.
153 *
154 * The workaround for this is to keep track of devices that have
155 * disconnected. If the device hasn't disconnected, for commands that
156 * should disconnect, we do something like
157 *
158 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
159 *
160 * Some tweaking of N and M needs to be done. An algorithm based
161 * on "time to data" would give the best results as long as short time
162 * to datas (ie, on the same track) were considered, however these
163 * broken devices are the exception rather than the rule and I'd rather
164 * spend my time optimizing for the normal case.
165 *
166 * Architecture :
167 *
168 * At the heart of the design is a coroutine, NCR5380_main,
169 * which is started from a workqueue for each NCR5380 host in the
170 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by
171 * removing the commands from the issue queue and calling
172 * NCR5380_select() if a nexus is not established.
173 *
174 * Once a nexus is established, the NCR5380_information_transfer()
175 * phase goes through the various phases as instructed by the target.
176 * if the target goes into MSG IN and sends a DISCONNECT message,
177 * the command structure is placed into the per instance disconnected
178 * queue, and NCR5380_main tries to find more work. If the target is
179 * idle for too long, the system will try to sleep.
180 *
181 * If a command has disconnected, eventually an interrupt will trigger,
182 * calling NCR5380_intr() which will in turn call NCR5380_reselect
183 * to reestablish a nexus. This will run main if necessary.
184 *
185 * On command termination, the done function will be called as
186 * appropriate.
187 *
188 * SCSI pointers are maintained in the SCp field of SCSI command
189 * structures, being initialized after the command is connected
190 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
191 * Note that in violation of the standard, an implicit SAVE POINTERS operation
192 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
193 */
194
195/*
196 * Using this file :
197 * This file a skeleton Linux SCSI driver for the NCR 5380 series
198 * of chips. To use it, you write an architecture specific functions
199 * and macros and include this file in your driver.
200 *
201 * These macros control options :
202 * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be
203 * defined.
204 *
205 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
206 * for commands that return with a CHECK CONDITION status.
207 *
208 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
209 * transceivers.
210 *
211 * DONT_USE_INTR - if defined, never use interrupts, even if we probe or
212 * override-configure an IRQ.
213 *
214 * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512
215 * bytes at a time. Since interrupts are disabled by default during
216 * these transfers, we might need this to give reasonable interrupt
217 * service time if the transfer size gets too large.
218 *
219 * LINKED - if defined, linked commands are supported.
220 *
221 * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases.
222 *
223 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
224 *
225 * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't
226 * rely on phase mismatch and EOP interrupts to determine end
227 * of phase.
228 *
229 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You
230 * only really want to use this if you're having a problem with
231 * dropped characters during high speed communications, and even
232 * then, you're going to be better off twiddling with transfersize
233 * in the high level code.
234 *
235 * Defaults for these will be provided although the user may want to adjust
236 * these to allocate CPU resources to the SCSI driver or "real" code.
237 *
238 * USLEEP_SLEEP - amount of time, in jiffies, to sleep
239 *
240 * USLEEP_POLL - amount of time, in jiffies, to poll
241 *
242 * These macros MUST be defined :
243 * NCR5380_local_declare() - declare any local variables needed for your
244 * transfer routines.
245 *
246 * NCR5380_setup(instance) - initialize any local variables needed from a given
247 * instance of the host adapter for NCR5380_{read,write,pread,pwrite}
248 *
249 * NCR5380_read(register) - read from the specified register
250 *
251 * NCR5380_write(register, value) - write to the specific register
252 *
253 * NCR5380_implementation_fields - additional fields needed for this
254 * specific implementation of the NCR5380
255 *
256 * Either real DMA *or* pseudo DMA may be implemented
257 * REAL functions :
258 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
259 * Note that the DMA setup functions should return the number of bytes
260 * that they were able to program the controller for.
261 *
262 * Also note that generic i386/PC versions of these macros are
263 * available as NCR5380_i386_dma_write_setup,
264 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
265 *
266 * NCR5380_dma_write_setup(instance, src, count) - initialize
267 * NCR5380_dma_read_setup(instance, dst, count) - initialize
268 * NCR5380_dma_residual(instance); - residual count
269 *
270 * PSEUDO functions :
271 * NCR5380_pwrite(instance, src, count)
272 * NCR5380_pread(instance, dst, count);
273 *
274 * The generic driver is initialized by calling NCR5380_init(instance),
275 * after setting the appropriate host specific fields and ID. If the
276 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
277 * possible) function may be used.
278 */
279
280static int do_abort(struct Scsi_Host *host);
281static void do_reset(struct Scsi_Host *host);
282
283/*
284 * initialize_SCp - init the scsi pointer field
285 * @cmd: command block to set up
286 *
287 * Set up the internal fields in the SCSI command.
288 */
289
290static __inline__ void initialize_SCp(Scsi_Cmnd * cmd)
291{
292 /*
293 * Initialize the Scsi Pointer field so that all of the commands in the
294 * various queues are valid.
295 */
296
297 if (cmd->use_sg) {
298 cmd->SCp.buffer = (struct scatterlist *) cmd->buffer;
299 cmd->SCp.buffers_residual = cmd->use_sg - 1;
300 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+
301 cmd->SCp.buffer->offset;
302 cmd->SCp.this_residual = cmd->SCp.buffer->length;
303 } else {
304 cmd->SCp.buffer = NULL;
305 cmd->SCp.buffers_residual = 0;
306 cmd->SCp.ptr = (char *) cmd->request_buffer;
307 cmd->SCp.this_residual = cmd->request_bufflen;
308 }
309}
310
311/**
312 * NCR5380_poll_politely - wait for NCR5380 status bits
313 * @instance: controller to poll
314 * @reg: 5380 register to poll
315 * @bit: Bitmask to check
316 * @val: Value required to exit
317 *
318 * Polls the NCR5380 in a reasonably efficient manner waiting for
319 * an event to occur, after a short quick poll we begin giving the
320 * CPU back in non IRQ contexts
321 *
322 * Returns the value of the register or a negative error code.
323 */
324
325static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t)
326{
327 NCR5380_local_declare();
328 int n = 500; /* At about 8uS a cycle for the cpu access */
329 unsigned long end = jiffies + t;
330 int r;
331
332 NCR5380_setup(instance);
333
334 while( n-- > 0)
335 {
336 r = NCR5380_read(reg);
337 if((r & bit) == val)
338 return 0;
339 cpu_relax();
340 }
341
342 /* t time yet ? */
343 while(time_before(jiffies, end))
344 {
345 r = NCR5380_read(reg);
346 if((r & bit) == val)
347 return 0;
348 if(!in_interrupt())
349 yield();
350 else
351 cpu_relax();
352 }
353 return -ETIMEDOUT;
354}
355
356static struct {
357 unsigned char value;
358 const char *name;
359} phases[] = {
360 {PHASE_DATAOUT, "DATAOUT"},
361 {PHASE_DATAIN, "DATAIN"},
362 {PHASE_CMDOUT, "CMDOUT"},
363 {PHASE_STATIN, "STATIN"},
364 {PHASE_MSGOUT, "MSGOUT"},
365 {PHASE_MSGIN, "MSGIN"},
366 {PHASE_UNKNOWN, "UNKNOWN"}
367};
368
viro@ZenIV.linux.org.uk185a7a12005-09-07 23:18:24 +0100369#if NDEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370static struct {
371 unsigned char mask;
372 const char *name;
373} signals[] = {
374 {SR_DBP, "PARITY"},
375 {SR_RST, "RST"},
376 {SR_BSY, "BSY"},
377 {SR_REQ, "REQ"},
378 {SR_MSG, "MSG"},
379 {SR_CD, "CD"},
380 {SR_IO, "IO"},
381 {SR_SEL, "SEL"},
382 {0, NULL}
383},
384basrs[] = {
385 {BASR_ATN, "ATN"},
386 {BASR_ACK, "ACK"},
387 {0, NULL}
388},
389icrs[] = {
390 {ICR_ASSERT_RST, "ASSERT RST"},
391 {ICR_ASSERT_ACK, "ASSERT ACK"},
392 {ICR_ASSERT_BSY, "ASSERT BSY"},
393 {ICR_ASSERT_SEL, "ASSERT SEL"},
394 {ICR_ASSERT_ATN, "ASSERT ATN"},
395 {ICR_ASSERT_DATA, "ASSERT DATA"},
396 {0, NULL}
397},
398mrs[] = {
399 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"},
400 {MR_TARGET, "MODE TARGET"},
401 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"},
402 {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"},
403 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
404 {MR_DMA_MODE, "MODE DMA"},
405 {MR_ARBITRATE, "MODE ARBITRATION"},
406 {0, NULL}
407};
408
409/**
410 * NCR5380_print - print scsi bus signals
411 * @instance: adapter state to dump
412 *
413 * Print the SCSI bus signals for debugging purposes
414 *
415 * Locks: caller holds hostdata lock (not essential)
416 */
417
418static void NCR5380_print(struct Scsi_Host *instance)
419{
420 NCR5380_local_declare();
421 unsigned char status, data, basr, mr, icr, i;
422 NCR5380_setup(instance);
423
424 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
425 status = NCR5380_read(STATUS_REG);
426 mr = NCR5380_read(MODE_REG);
427 icr = NCR5380_read(INITIATOR_COMMAND_REG);
428 basr = NCR5380_read(BUS_AND_STATUS_REG);
429
430 printk("STATUS_REG: %02x ", status);
431 for (i = 0; signals[i].mask; ++i)
432 if (status & signals[i].mask)
433 printk(",%s", signals[i].name);
434 printk("\nBASR: %02x ", basr);
435 for (i = 0; basrs[i].mask; ++i)
436 if (basr & basrs[i].mask)
437 printk(",%s", basrs[i].name);
438 printk("\nICR: %02x ", icr);
439 for (i = 0; icrs[i].mask; ++i)
440 if (icr & icrs[i].mask)
441 printk(",%s", icrs[i].name);
442 printk("\nMODE: %02x ", mr);
443 for (i = 0; mrs[i].mask; ++i)
444 if (mr & mrs[i].mask)
445 printk(",%s", mrs[i].name);
446 printk("\n");
447}
448
449
450/*
451 * NCR5380_print_phase - show SCSI phase
452 * @instance: adapter to dump
453 *
454 * Print the current SCSI phase for debugging purposes
455 *
456 * Locks: none
457 */
458
459static void NCR5380_print_phase(struct Scsi_Host *instance)
460{
461 NCR5380_local_declare();
462 unsigned char status;
463 int i;
464 NCR5380_setup(instance);
465
466 status = NCR5380_read(STATUS_REG);
467 if (!(status & SR_REQ))
468 printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no);
469 else {
470 for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i);
471 printk("scsi%d : phase %s\n", instance->host_no, phases[i].name);
472 }
473}
474#endif
475
476/*
477 * These need tweaking, and would probably work best as per-device
478 * flags initialized differently for disk, tape, cd, etc devices.
479 * People with broken devices are free to experiment as to what gives
480 * the best results for them.
481 *
482 * USLEEP_SLEEP should be a minimum seek time.
483 *
484 * USLEEP_POLL should be a maximum rotational latency.
485 */
486#ifndef USLEEP_SLEEP
487/* 20 ms (reasonable hard disk speed) */
488#define USLEEP_SLEEP (20*HZ/1000)
489#endif
490/* 300 RPM (floppy speed) */
491#ifndef USLEEP_POLL
492#define USLEEP_POLL (200*HZ/1000)
493#endif
494#ifndef USLEEP_WAITLONG
495/* RvC: (reasonable time to wait on select error) */
496#define USLEEP_WAITLONG USLEEP_SLEEP
497#endif
498
499/*
500 * Function : int should_disconnect (unsigned char cmd)
501 *
502 * Purpose : decide weather a command would normally disconnect or
503 * not, since if it won't disconnect we should go to sleep.
504 *
505 * Input : cmd - opcode of SCSI command
506 *
507 * Returns : DISCONNECT_LONG if we should disconnect for a really long
508 * time (ie always, sleep, look for REQ active, sleep),
509 * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal
510 * time-to-data delay, DISCONNECT_NONE if this command would return
511 * immediately.
512 *
513 * Future sleep algorithms based on time to data can exploit
514 * something like this so they can differentiate between "normal"
515 * (ie, read, write, seek) and unusual commands (ie, * format).
516 *
517 * Note : We don't deal with commands that handle an immediate disconnect,
518 *
519 */
520
521static int should_disconnect(unsigned char cmd)
522{
523 switch (cmd) {
524 case READ_6:
525 case WRITE_6:
526 case SEEK_6:
527 case READ_10:
528 case WRITE_10:
529 case SEEK_10:
530 return DISCONNECT_TIME_TO_DATA;
531 case FORMAT_UNIT:
532 case SEARCH_HIGH:
533 case SEARCH_LOW:
534 case SEARCH_EQUAL:
535 return DISCONNECT_LONG;
536 default:
537 return DISCONNECT_NONE;
538 }
539}
540
541static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout)
542{
543 hostdata->time_expires = jiffies + timeout;
544 schedule_delayed_work(&hostdata->coroutine, timeout);
545}
546
547
548static int probe_irq __initdata = 0;
549
550/**
551 * probe_intr - helper for IRQ autoprobe
552 * @irq: interrupt number
553 * @dev_id: unused
554 * @regs: unused
555 *
556 * Set a flag to indicate the IRQ in question was received. This is
557 * used by the IRQ probe code.
558 */
559
560static irqreturn_t __init probe_intr(int irq, void *dev_id,
561 struct pt_regs *regs)
562{
563 probe_irq = irq;
564 return IRQ_HANDLED;
565}
566
567/**
568 * NCR5380_probe_irq - find the IRQ of an NCR5380
569 * @instance: NCR5380 controller
570 * @possible: bitmask of ISA IRQ lines
571 *
572 * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ
573 * and then looking to see what interrupt actually turned up.
574 *
575 * Locks: none, irqs must be enabled on entry
576 */
577
578static int __init NCR5380_probe_irq(struct Scsi_Host *instance, int possible)
579{
580 NCR5380_local_declare();
581 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
582 unsigned long timeout;
583 int trying_irqs, i, mask;
584 NCR5380_setup(instance);
585
586 for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1)
587 if ((mask & possible) && (request_irq(i, &probe_intr, SA_INTERRUPT, "NCR-probe", NULL) == 0))
588 trying_irqs |= mask;
589
590 timeout = jiffies + (250 * HZ / 1000);
591 probe_irq = SCSI_IRQ_NONE;
592
593 /*
594 * A interrupt is triggered whenever BSY = false, SEL = true
595 * and a bit set in the SELECT_ENABLE_REG is asserted on the
596 * SCSI bus.
597 *
598 * Note that the bus is only driven when the phase control signals
599 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that
600 * to zero.
601 */
602
603 NCR5380_write(TARGET_COMMAND_REG, 0);
604 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
605 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
606 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL);
607
608 while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout))
609 {
610 set_current_state(TASK_UNINTERRUPTIBLE);
611 schedule_timeout(1);
612 }
613
614 NCR5380_write(SELECT_ENABLE_REG, 0);
615 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
616
617 for (i = 0, mask = 1; i < 16; ++i, mask <<= 1)
618 if (trying_irqs & mask)
619 free_irq(i, NULL);
620
621 return probe_irq;
622}
623
624/**
625 * NCR58380_print_options - show options
626 * @instance: unused for now
627 *
628 * Called by probe code indicating the NCR5380 driver options that
629 * were selected. At some point this will switch to runtime options
630 * read from the adapter in question
631 *
632 * Locks: none
633 */
634
635static void __init NCR5380_print_options(struct Scsi_Host *instance)
636{
637 printk(" generic options"
638#ifdef AUTOPROBE_IRQ
639 " AUTOPROBE_IRQ"
640#endif
641#ifdef AUTOSENSE
642 " AUTOSENSE"
643#endif
644#ifdef DIFFERENTIAL
645 " DIFFERENTIAL"
646#endif
647#ifdef REAL_DMA
648 " REAL DMA"
649#endif
650#ifdef REAL_DMA_POLL
651 " REAL DMA POLL"
652#endif
653#ifdef PARITY
654 " PARITY"
655#endif
656#ifdef PSEUDO_DMA
657 " PSEUDO DMA"
658#endif
659#ifdef UNSAFE
660 " UNSAFE "
661#endif
662 );
663 printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP);
664 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
665 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) {
666 printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE);
667 }
668}
669
670/**
671 * NCR5380_print_status - dump controller info
672 * @instance: controller to dump
673 *
674 * Print commands in the various queues, called from NCR5380_abort
675 * and NCR5380_debug to aid debugging.
676 *
677 * Locks: called functions disable irqs
678 */
679
680static void NCR5380_print_status(struct Scsi_Host *instance)
681{
682 NCR5380_dprint(NDEBUG_ANY, instance);
683 NCR5380_dprint_phase(NDEBUG_ANY, instance);
684}
685
686/******************************************/
687/*
688 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
689 *
690 * *buffer: I/O buffer
691 * **start: if inout == FALSE pointer into buffer where user read should start
692 * offset: current offset
693 * length: length of buffer
694 * hostno: Scsi_Host host_no
695 * inout: TRUE - user is writing; FALSE - user is reading
696 *
697 * Return the number of bytes read from or written
698 */
699
700#undef SPRINTF
701#define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0)
702static
703char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length);
704static
705char *lprint_command(unsigned char *cmd, char *pos, char *buffer, int len);
706static
707char *lprint_opcode(int opcode, char *pos, char *buffer, int length);
708
709static
710int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer, char **start, off_t offset, int length, int inout)
711{
712 char *pos = buffer;
713 struct NCR5380_hostdata *hostdata;
714 Scsi_Cmnd *ptr;
715
716 hostdata = (struct NCR5380_hostdata *) instance->hostdata;
717
718 if (inout) { /* Has data been written to the file ? */
719#ifdef DTC_PUBLIC_RELEASE
720 dtc_wmaxi = dtc_maxi = 0;
721#endif
722#ifdef PAS16_PUBLIC_RELEASE
723 pas_wmaxi = pas_maxi = 0;
724#endif
725 return (-ENOSYS); /* Currently this is a no-op */
726 }
727 SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE);
728 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400)
729 SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE);
730#ifdef DTC_PUBLIC_RELEASE
731 SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE);
732#endif
733#ifdef T128_PUBLIC_RELEASE
734 SPRINTF("T128 release %d", T128_PUBLIC_RELEASE);
735#endif
736#ifdef GENERIC_NCR5380_PUBLIC_RELEASE
737 SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE);
738#endif
739#ifdef PAS16_PUBLIC_RELEASE
740 SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE);
741#endif
742
743 SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base);
744 SPRINTF("io_port: %04x ", (int) instance->io_port);
745 if (instance->irq == SCSI_IRQ_NONE)
746 SPRINTF("IRQ: None.\n");
747 else
748 SPRINTF("IRQ: %d.\n", instance->irq);
749
750#ifdef DTC_PUBLIC_RELEASE
751 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi);
752#endif
753#ifdef PAS16_PUBLIC_RELEASE
754 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi);
755#endif
756 spin_lock_irq(instance->host_lock);
757 if (!hostdata->connected)
758 SPRINTF("scsi%d: no currently connected command\n", instance->host_no);
759 else
760 pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, pos, buffer, length);
761 SPRINTF("scsi%d: issue_queue\n", instance->host_no);
762 for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
763 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
764
765 SPRINTF("scsi%d: disconnected_queue\n", instance->host_no);
766 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
767 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
768 spin_unlock_irq(instance->host_lock);
769
770 *start = buffer;
771 if (pos - buffer < offset)
772 return 0;
773 else if (pos - buffer - offset < length)
774 return pos - buffer - offset;
775 return length;
776}
777
778static char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length)
779{
780 SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun);
781 SPRINTF(" command = ");
782 pos = lprint_command(cmd->cmnd, pos, buffer, length);
783 return (pos);
784}
785
786static char *lprint_command(unsigned char *command, char *pos, char *buffer, int length)
787{
788 int i, s;
789 pos = lprint_opcode(command[0], pos, buffer, length);
790 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
791 SPRINTF("%02x ", command[i]);
792 SPRINTF("\n");
793 return (pos);
794}
795
796static char *lprint_opcode(int opcode, char *pos, char *buffer, int length)
797{
798 SPRINTF("%2d (0x%02x)", opcode, opcode);
799 return (pos);
800}
801
802
803/**
804 * NCR5380_init - initialise an NCR5380
805 * @instance: adapter to configure
806 * @flags: control flags
807 *
808 * Initializes *instance and corresponding 5380 chip,
809 * with flags OR'd into the initial flags value.
810 *
811 * Notes : I assume that the host, hostno, and id bits have been
812 * set correctly. I don't care about the irq and other fields.
813 *
814 * Returns 0 for success
815 *
816 * Locks: interrupts must be enabled when we are called
817 */
818
819static int __devinit NCR5380_init(struct Scsi_Host *instance, int flags)
820{
821 NCR5380_local_declare();
822 int i, pass;
823 unsigned long timeout;
824 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
825
826 if(in_interrupt())
827 printk(KERN_ERR "NCR5380_init called with interrupts off!\n");
828 /*
829 * On NCR53C400 boards, NCR5380 registers are mapped 8 past
830 * the base address.
831 */
832
833#ifdef NCR53C400
834 if (flags & FLAG_NCR53C400)
835 instance->NCR5380_instance_name += NCR53C400_address_adjust;
836#endif
837
838 NCR5380_setup(instance);
839
840 hostdata->aborted = 0;
841 hostdata->id_mask = 1 << instance->this_id;
842 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
843 if (i > hostdata->id_mask)
844 hostdata->id_higher_mask |= i;
845 for (i = 0; i < 8; ++i)
846 hostdata->busy[i] = 0;
847#ifdef REAL_DMA
848 hostdata->dmalen = 0;
849#endif
850 hostdata->targets_present = 0;
851 hostdata->connected = NULL;
852 hostdata->issue_queue = NULL;
853 hostdata->disconnected_queue = NULL;
854
855 INIT_WORK(&hostdata->coroutine, NCR5380_main, hostdata);
856
857#ifdef NCR5380_STATS
858 for (i = 0; i < 8; ++i) {
859 hostdata->time_read[i] = 0;
860 hostdata->time_write[i] = 0;
861 hostdata->bytes_read[i] = 0;
862 hostdata->bytes_write[i] = 0;
863 }
864 hostdata->timebase = 0;
865 hostdata->pendingw = 0;
866 hostdata->pendingr = 0;
867#endif
868
869 /* The CHECK code seems to break the 53C400. Will check it later maybe */
870 if (flags & FLAG_NCR53C400)
871 hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags;
872 else
873 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags;
874
875 hostdata->host = instance;
876 hostdata->time_expires = 0;
877
878#ifndef AUTOSENSE
879 if ((instance->cmd_per_lun > 1) || instance->can_queue > 1)
880 printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n"
881 " be incorrectly cleared.\n", instance->host_no);
882#endif /* def AUTOSENSE */
883
884 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
885 NCR5380_write(MODE_REG, MR_BASE);
886 NCR5380_write(TARGET_COMMAND_REG, 0);
887 NCR5380_write(SELECT_ENABLE_REG, 0);
888
889#ifdef NCR53C400
890 if (hostdata->flags & FLAG_NCR53C400) {
891 NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
892 }
893#endif
894
895 /*
896 * Detect and correct bus wedge problems.
897 *
898 * If the system crashed, it may have crashed in a state
899 * where a SCSI command was still executing, and the
900 * SCSI bus is not in a BUS FREE STATE.
901 *
902 * If this is the case, we'll try to abort the currently
903 * established nexus which we know nothing about, and that
904 * failing, do a hard reset of the SCSI bus
905 */
906
907 for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) {
908 switch (pass) {
909 case 1:
910 case 3:
911 case 5:
912 printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no);
913 timeout = jiffies + 5 * HZ;
914 NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ);
915 break;
916 case 2:
917 printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no);
918 do_abort(instance);
919 break;
920 case 4:
921 printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no);
922 do_reset(instance);
923 break;
924 case 6:
925 printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no);
926 return -ENXIO;
927 }
928 }
929 return 0;
930}
931
932/**
933 * NCR5380_exit - remove an NCR5380
934 * @instance: adapter to remove
935 */
936
937static void __devexit NCR5380_exit(struct Scsi_Host *instance)
938{
939 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
940
941 cancel_delayed_work(&hostdata->coroutine);
942 flush_scheduled_work();
943}
944
945/**
946 * NCR5380_queue_command - queue a command
947 * @cmd: SCSI command
948 * @done: completion handler
949 *
950 * cmd is added to the per instance issue_queue, with minor
951 * twiddling done to the host specific fields of cmd. If the
952 * main coroutine is not running, it is restarted.
953 *
954 * Locks: host lock taken by caller
955 */
956
957static int NCR5380_queue_command(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
958{
959 struct Scsi_Host *instance = cmd->device->host;
960 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
961 Scsi_Cmnd *tmp;
962
963#if (NDEBUG & NDEBUG_NO_WRITE)
964 switch (cmd->cmnd[0]) {
965 case WRITE_6:
966 case WRITE_10:
967 printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no);
968 cmd->result = (DID_ERROR << 16);
969 done(cmd);
970 return 0;
971 }
972#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
973
974#ifdef NCR5380_STATS
975 switch (cmd->cmnd[0]) {
976 case WRITE:
977 case WRITE_6:
978 case WRITE_10:
979 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
980 hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;
981 hostdata->pendingw++;
982 break;
983 case READ:
984 case READ_6:
985 case READ_10:
986 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
987 hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;
988 hostdata->pendingr++;
989 break;
990 }
991#endif
992
993 /*
994 * We use the host_scribble field as a pointer to the next command
995 * in a queue
996 */
997
998 cmd->host_scribble = NULL;
999 cmd->scsi_done = done;
1000 cmd->result = 0;
1001
1002 /*
1003 * Insert the cmd into the issue queue. Note that REQUEST SENSE
1004 * commands are added to the head of the queue since any command will
1005 * clear the contingent allegiance condition that exists and the
1006 * sense data is only guaranteed to be valid while the condition exists.
1007 */
1008
1009 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
1010 LIST(cmd, hostdata->issue_queue);
1011 cmd->host_scribble = (unsigned char *) hostdata->issue_queue;
1012 hostdata->issue_queue = cmd;
1013 } else {
1014 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble);
1015 LIST(cmd, tmp);
1016 tmp->host_scribble = (unsigned char *) cmd;
1017 }
1018 dprintk(NDEBUG_QUEUES, ("scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"));
1019
1020 /* Run the coroutine if it isn't already running. */
1021 /* Kick off command processing */
1022 schedule_work(&hostdata->coroutine);
1023 return 0;
1024}
1025
1026
1027/**
1028 * NCR5380_main - NCR state machines
1029 *
1030 * NCR5380_main is a coroutine that runs as long as more work can
1031 * be done on the NCR5380 host adapters in a system. Both
1032 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1033 * in case it is not running.
1034 *
1035 * Locks: called as its own thread with no locks held. Takes the
1036 * host lock and called routines may take the isa dma lock.
1037 */
1038
1039static void NCR5380_main(void *p)
1040{
1041 struct NCR5380_hostdata *hostdata = p;
1042 struct Scsi_Host *instance = hostdata->host;
1043 Scsi_Cmnd *tmp, *prev;
1044 int done;
1045
1046 spin_lock_irq(instance->host_lock);
1047 do {
1048 /* Lock held here */
1049 done = 1;
1050 if (!hostdata->connected && !hostdata->selecting) {
1051 dprintk(NDEBUG_MAIN, ("scsi%d : not connected\n", instance->host_no));
1052 /*
1053 * Search through the issue_queue for a command destined
1054 * for a target that's not busy.
1055 */
1056 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
1057 {
1058 if (prev != tmp)
1059 dprintk(NDEBUG_LISTS, ("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun));
1060 /* When we find one, remove it from the issue queue. */
1061 if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) {
1062 if (prev) {
1063 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
1064 prev->host_scribble = tmp->host_scribble;
1065 } else {
1066 REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble);
1067 hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble;
1068 }
1069 tmp->host_scribble = NULL;
1070
1071 /*
1072 * Attempt to establish an I_T_L nexus here.
1073 * On success, instance->hostdata->connected is set.
1074 * On failure, we must add the command back to the
1075 * issue queue so we can keep trying.
1076 */
1077 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main() : command for target %d lun %d removed from issue_queue\n", instance->host_no, tmp->target, tmp->lun));
1078
1079 /*
1080 * A successful selection is defined as one that
1081 * leaves us with the command connected and
1082 * in hostdata->connected, OR has terminated the
1083 * command.
1084 *
1085 * With successful commands, we fall through
1086 * and see if we can do an information transfer,
1087 * with failures we will restart.
1088 */
1089 hostdata->selecting = NULL;
1090 /* RvC: have to preset this to indicate a new command is being performed */
1091
1092 if (!NCR5380_select(instance, tmp,
1093 /*
1094 * REQUEST SENSE commands are issued without tagged
1095 * queueing, even on SCSI-II devices because the
1096 * contingent allegiance condition exists for the
1097 * entire unit.
1098 */
1099 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
1100 break;
1101 } else {
1102 LIST(tmp, hostdata->issue_queue);
1103 tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1104 hostdata->issue_queue = tmp;
1105 done = 0;
1106 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no));
1107 }
1108 /* lock held here still */
1109 } /* if target/lun is not busy */
1110 } /* for */
1111 /* exited locked */
1112 } /* if (!hostdata->connected) */
1113 if (hostdata->selecting) {
1114 tmp = (Scsi_Cmnd *) hostdata->selecting;
1115 /* Selection will drop and retake the lock */
1116 if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
1117 /* Ok ?? */
1118 } else {
1119 /* RvC: device failed, so we wait a long time
1120 this is needed for Mustek scanners, that
1121 do not respond to commands immediately
1122 after a scan */
1123 printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id);
1124 LIST(tmp, hostdata->issue_queue);
1125 tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1126 hostdata->issue_queue = tmp;
1127 NCR5380_set_timer(hostdata, USLEEP_WAITLONG);
1128 }
1129 } /* if hostdata->selecting */
1130 if (hostdata->connected
1131#ifdef REAL_DMA
1132 && !hostdata->dmalen
1133#endif
1134 && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies))
1135 ) {
1136 dprintk(NDEBUG_MAIN, ("scsi%d : main() : performing information transfer\n", instance->host_no));
1137 NCR5380_information_transfer(instance);
1138 dprintk(NDEBUG_MAIN, ("scsi%d : main() : done set false\n", instance->host_no));
1139 done = 0;
1140 } else
1141 break;
1142 } while (!done);
1143
1144 spin_unlock_irq(instance->host_lock);
1145}
1146
1147#ifndef DONT_USE_INTR
1148
1149/**
1150 * NCR5380_intr - generic NCR5380 irq handler
1151 * @irq: interrupt number
1152 * @dev_id: device info
1153 * @regs: registers (unused)
1154 *
1155 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1156 * from the disconnected queue, and restarting NCR5380_main()
1157 * as required.
1158 *
1159 * Locks: takes the needed instance locks
1160 */
1161
1162static irqreturn_t NCR5380_intr(int irq, void *dev_id, struct pt_regs *regs)
1163{
1164 NCR5380_local_declare();
1165 struct Scsi_Host *instance = (struct Scsi_Host *)dev_id;
1166 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1167 int done;
1168 unsigned char basr;
1169 unsigned long flags;
1170
1171 dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n", irq));
1172
1173 do {
1174 done = 1;
1175 spin_lock_irqsave(instance->host_lock, flags);
1176 /* Look for pending interrupts */
1177 NCR5380_setup(instance);
1178 basr = NCR5380_read(BUS_AND_STATUS_REG);
1179 /* XXX dispatch to appropriate routine if found and done=0 */
1180 if (basr & BASR_IRQ) {
1181 NCR5380_dprint(NDEBUG_INTR, instance);
1182 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1183 done = 0;
1184 dprintk(NDEBUG_INTR, ("scsi%d : SEL interrupt\n", instance->host_no));
1185 NCR5380_reselect(instance);
1186 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1187 } else if (basr & BASR_PARITY_ERROR) {
1188 dprintk(NDEBUG_INTR, ("scsi%d : PARITY interrupt\n", instance->host_no));
1189 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1190 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1191 dprintk(NDEBUG_INTR, ("scsi%d : RESET interrupt\n", instance->host_no));
1192 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1193 } else {
1194#if defined(REAL_DMA)
1195 /*
1196 * We should only get PHASE MISMATCH and EOP interrupts
1197 * if we have DMA enabled, so do a sanity check based on
1198 * the current setting of the MODE register.
1199 */
1200
1201 if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) {
1202 int transfered;
1203
1204 if (!hostdata->connected)
1205 panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno);
1206
1207 transfered = (hostdata->dmalen - NCR5380_dma_residual(instance));
1208 hostdata->connected->SCp.this_residual -= transferred;
1209 hostdata->connected->SCp.ptr += transferred;
1210 hostdata->dmalen = 0;
1211
1212 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1213
1214 /* FIXME: we need to poll briefly then defer a workqueue task ! */
1215 NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ);
1216
1217 NCR5380_write(MODE_REG, MR_BASE);
1218 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1219 }
1220#else
1221 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)));
1222 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1223#endif
1224 }
1225 } /* if BASR_IRQ */
1226 spin_unlock_irqrestore(instance->host_lock, flags);
1227 if(!done)
1228 schedule_work(&hostdata->coroutine);
1229 } while (!done);
1230 return IRQ_HANDLED;
1231}
1232
1233#endif
1234
1235/**
1236 * collect_stats - collect stats on a scsi command
1237 * @hostdata: adapter
1238 * @cmd: command being issued
1239 *
1240 * Update the statistical data by parsing the command in question
1241 */
1242
1243static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd)
1244{
1245#ifdef NCR5380_STATS
1246 switch (cmd->cmnd[0]) {
1247 case WRITE:
1248 case WRITE_6:
1249 case WRITE_10:
1250 hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
1251 hostdata->pendingw--;
1252 break;
1253 case READ:
1254 case READ_6:
1255 case READ_10:
1256 hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
1257 hostdata->pendingr--;
1258 break;
1259 }
1260#endif
1261}
1262
1263
1264/*
1265 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
1266 * int tag);
1267 *
1268 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1269 * including ARBITRATION, SELECTION, and initial message out for
1270 * IDENTIFY and queue messages.
1271 *
1272 * Inputs : instance - instantiation of the 5380 driver on which this
1273 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1274 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1275 * the command that is presently connected.
1276 *
1277 * Returns : -1 if selection could not execute for some reason,
1278 * 0 if selection succeeded or failed because the target
1279 * did not respond.
1280 *
1281 * Side effects :
1282 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1283 * with registers as they should have been on entry - ie
1284 * SELECT_ENABLE will be set appropriately, the NCR5380
1285 * will cease to drive any SCSI bus signals.
1286 *
1287 * If successful : I_T_L or I_T_L_Q nexus will be established,
1288 * instance->connected will be set to cmd.
1289 * SELECT interrupt will be disabled.
1290 *
1291 * If failed (no target) : cmd->scsi_done() will be called, and the
1292 * cmd->result host byte set to DID_BAD_TARGET.
1293 *
1294 * Locks: caller holds hostdata lock in IRQ mode
1295 */
1296
1297static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag)
1298{
1299 NCR5380_local_declare();
1300 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1301 unsigned char tmp[3], phase;
1302 unsigned char *data;
1303 int len;
1304 unsigned long timeout;
1305 unsigned char value;
1306 int err;
1307 NCR5380_setup(instance);
1308
1309 if (hostdata->selecting)
1310 goto part2;
1311
1312 hostdata->restart_select = 0;
1313
1314 NCR5380_dprint(NDEBUG_ARBITRATION, instance);
1315 dprintk(NDEBUG_ARBITRATION, ("scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id));
1316
1317 /*
1318 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1319 * data bus during SELECTION.
1320 */
1321
1322 NCR5380_write(TARGET_COMMAND_REG, 0);
1323
1324 /*
1325 * Start arbitration.
1326 */
1327
1328 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1329 NCR5380_write(MODE_REG, MR_ARBITRATE);
1330
1331
1332 /* We can be relaxed here, interrupts are on, we are
1333 in workqueue context, the birds are singing in the trees */
1334 spin_unlock_irq(instance->host_lock);
1335 err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ);
1336 spin_lock_irq(instance->host_lock);
1337 if (err < 0) {
1338 printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__);
1339 NCR5380_write(MODE_REG, MR_BASE);
1340 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1341 goto failed;
1342 }
1343
1344 dprintk(NDEBUG_ARBITRATION, ("scsi%d : arbitration complete\n", instance->host_no));
1345
1346 /*
1347 * The arbitration delay is 2.2us, but this is a minimum and there is
1348 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1349 * the integral nature of udelay().
1350 *
1351 */
1352
1353 udelay(3);
1354
1355 /* Check for lost arbitration */
1356 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)) {
1357 NCR5380_write(MODE_REG, MR_BASE);
1358 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no));
1359 goto failed;
1360 }
1361 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL);
1362
1363 if (!(hostdata->flags & FLAG_DTC3181E) &&
1364 /* RvC: DTC3181E has some trouble with this
1365 * so we simply removed it. Seems to work with
1366 * only Mustek scanner attached
1367 */
1368 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
1369 NCR5380_write(MODE_REG, MR_BASE);
1370 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1371 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no));
1372 goto failed;
1373 }
1374 /*
1375 * Again, bus clear + bus settle time is 1.2us, however, this is
1376 * a minimum so we'll udelay ceil(1.2)
1377 */
1378
1379 udelay(2);
1380
1381 dprintk(NDEBUG_ARBITRATION, ("scsi%d : won arbitration\n", instance->host_no));
1382
1383 /*
1384 * Now that we have won arbitration, start Selection process, asserting
1385 * the host and target ID's on the SCSI bus.
1386 */
1387
1388 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
1389
1390 /*
1391 * Raise ATN while SEL is true before BSY goes false from arbitration,
1392 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1393 * phase immediately after selection.
1394 */
1395
1396 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1397 NCR5380_write(MODE_REG, MR_BASE);
1398
1399 /*
1400 * Reselect interrupts must be turned off prior to the dropping of BSY,
1401 * otherwise we will trigger an interrupt.
1402 */
1403 NCR5380_write(SELECT_ENABLE_REG, 0);
1404
1405 /*
1406 * The initiator shall then wait at least two deskew delays and release
1407 * the BSY signal.
1408 */
1409 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1410
1411 /* Reset BSY */
1412 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1413
1414 /*
1415 * Something weird happens when we cease to drive BSY - looks
1416 * like the board/chip is letting us do another read before the
1417 * appropriate propagation delay has expired, and we're confusing
1418 * a BSY signal from ourselves as the target's response to SELECTION.
1419 *
1420 * A small delay (the 'C++' frontend breaks the pipeline with an
1421 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1422 * tighter 'C' code breaks and requires this) solves the problem -
1423 * the 1 us delay is arbitrary, and only used because this delay will
1424 * be the same on other platforms and since it works here, it should
1425 * work there.
1426 *
1427 * wingel suggests that this could be due to failing to wait
1428 * one deskew delay.
1429 */
1430
1431 udelay(1);
1432
1433 dprintk(NDEBUG_SELECTION, ("scsi%d : selecting target %d\n", instance->host_no, cmd->device->id));
1434
1435 /*
1436 * The SCSI specification calls for a 250 ms timeout for the actual
1437 * selection.
1438 */
1439
1440 timeout = jiffies + (250 * HZ / 1000);
1441
1442 /*
1443 * XXX very interesting - we're seeing a bounce where the BSY we
1444 * asserted is being reflected / still asserted (propagation delay?)
1445 * and it's detecting as true. Sigh.
1446 */
1447
1448 hostdata->select_time = 0; /* we count the clock ticks at which we polled */
1449 hostdata->selecting = cmd;
1450
1451part2:
1452 /* RvC: here we enter after a sleeping period, or immediately after
1453 execution of part 1
1454 we poll only once ech clock tick */
1455 value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO);
1456
1457 if (!value && (hostdata->select_time < HZ/4)) {
1458 /* RvC: we still must wait for a device response */
1459 hostdata->select_time++; /* after 25 ticks the device has failed */
1460 NCR5380_set_timer(hostdata, 1);
1461 return 0; /* RvC: we return here with hostdata->selecting set,
1462 to go to sleep */
1463 }
1464
1465 hostdata->selecting = NULL;/* clear this pointer, because we passed the
1466 waiting period */
1467 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1468 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1469 NCR5380_reselect(instance);
1470 printk("scsi%d : reselection after won arbitration?\n", instance->host_no);
1471 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1472 return -1;
1473 }
1474 /*
1475 * No less than two deskew delays after the initiator detects the
1476 * BSY signal is true, it shall release the SEL signal and may
1477 * change the DATA BUS. -wingel
1478 */
1479
1480 udelay(1);
1481
1482 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1483
1484 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1485 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1486 if (hostdata->targets_present & (1 << cmd->device->id)) {
1487 printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no);
1488 if (hostdata->restart_select)
1489 printk(KERN_DEBUG "\trestart select\n");
1490 NCR5380_dprint(NDEBUG_SELECTION, instance);
1491 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1492 return -1;
1493 }
1494 cmd->result = DID_BAD_TARGET << 16;
1495 collect_stats(hostdata, cmd);
1496 cmd->scsi_done(cmd);
1497 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1498 dprintk(NDEBUG_SELECTION, ("scsi%d : target did not respond within 250ms\n", instance->host_no));
1499 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1500 return 0;
1501 }
1502 hostdata->targets_present |= (1 << cmd->device->id);
1503
1504 /*
1505 * Since we followed the SCSI spec, and raised ATN while SEL
1506 * was true but before BSY was false during selection, the information
1507 * transfer phase should be a MESSAGE OUT phase so that we can send the
1508 * IDENTIFY message.
1509 *
1510 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1511 * message (2 bytes) with a tag ID that we increment with every command
1512 * until it wraps back to 0.
1513 *
1514 * XXX - it turns out that there are some broken SCSI-II devices,
1515 * which claim to support tagged queuing but fail when more than
1516 * some number of commands are issued at once.
1517 */
1518
1519 /* Wait for start of REQ/ACK handshake */
1520
1521 spin_unlock_irq(instance->host_lock);
1522 err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ);
1523 spin_lock_irq(instance->host_lock);
1524
1525 if(err) {
1526 printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__);
1527 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1528 goto failed;
1529 }
1530
1531 dprintk(NDEBUG_SELECTION, ("scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id));
1532 tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun);
1533
1534 len = 1;
1535 cmd->tag = 0;
1536
1537 /* Send message(s) */
1538 data = tmp;
1539 phase = PHASE_MSGOUT;
1540 NCR5380_transfer_pio(instance, &phase, &len, &data);
1541 dprintk(NDEBUG_SELECTION, ("scsi%d : nexus established.\n", instance->host_no));
1542 /* XXX need to handle errors here */
1543 hostdata->connected = cmd;
1544 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1545
1546 if (cmd->SCp.ptr != (char *)cmd->sense_buffer) {
1547 initialize_SCp(cmd);
1548 }
1549
1550 return 0;
1551
1552 /* Selection failed */
1553failed:
1554 return -1;
1555
1556}
1557
1558/*
1559 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1560 * unsigned char *phase, int *count, unsigned char **data)
1561 *
1562 * Purpose : transfers data in given phase using polled I/O
1563 *
1564 * Inputs : instance - instance of driver, *phase - pointer to
1565 * what phase is expected, *count - pointer to number of
1566 * bytes to transfer, **data - pointer to data pointer.
1567 *
1568 * Returns : -1 when different phase is entered without transferring
1569 * maximum number of bytes, 0 if all bytes or transfered or exit
1570 * is in same phase.
1571 *
1572 * Also, *phase, *count, *data are modified in place.
1573 *
1574 * XXX Note : handling for bus free may be useful.
1575 */
1576
1577/*
1578 * Note : this code is not as quick as it could be, however it
1579 * IS 100% reliable, and for the actual data transfer where speed
1580 * counts, we will always do a pseudo DMA or DMA transfer.
1581 */
1582
1583static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1584 NCR5380_local_declare();
1585 unsigned char p = *phase, tmp;
1586 int c = *count;
1587 unsigned char *d = *data;
1588 /*
1589 * RvC: some administrative data to process polling time
1590 */
1591 int break_allowed = 0;
1592 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1593 NCR5380_setup(instance);
1594
1595 if (!(p & SR_IO))
1596 dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c));
1597 else
1598 dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c));
1599
1600 /*
1601 * The NCR5380 chip will only drive the SCSI bus when the
1602 * phase specified in the appropriate bits of the TARGET COMMAND
1603 * REGISTER match the STATUS REGISTER
1604 */
1605
1606 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1607
1608 /* RvC: don't know if this is necessary, but other SCSI I/O is short
1609 * so breaks are not necessary there
1610 */
1611 if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) {
1612 break_allowed = 1;
1613 }
1614 do {
1615 /*
1616 * Wait for assertion of REQ, after which the phase bits will be
1617 * valid
1618 */
1619
1620 /* RvC: we simply poll once, after that we stop temporarily
1621 * and let the device buffer fill up
1622 * if breaking is not allowed, we keep polling as long as needed
1623 */
1624
1625 /* FIXME */
1626 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed);
1627 if (!(tmp & SR_REQ)) {
1628 /* timeout condition */
1629 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
1630 break;
1631 }
1632
1633 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no));
1634
1635 /* Check for phase mismatch */
1636 if ((tmp & PHASE_MASK) != p) {
1637 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no));
1638 NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance);
1639 break;
1640 }
1641 /* Do actual transfer from SCSI bus to / from memory */
1642 if (!(p & SR_IO))
1643 NCR5380_write(OUTPUT_DATA_REG, *d);
1644 else
1645 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1646
1647 ++d;
1648
1649 /*
1650 * The SCSI standard suggests that in MSGOUT phase, the initiator
1651 * should drop ATN on the last byte of the message phase
1652 * after REQ has been asserted for the handshake but before
1653 * the initiator raises ACK.
1654 */
1655
1656 if (!(p & SR_IO)) {
1657 if (!((p & SR_MSG) && c > 1)) {
1658 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1659 NCR5380_dprint(NDEBUG_PIO, instance);
1660 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1661 } else {
1662 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1663 NCR5380_dprint(NDEBUG_PIO, instance);
1664 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1665 }
1666 } else {
1667 NCR5380_dprint(NDEBUG_PIO, instance);
1668 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1669 }
1670
1671 /* FIXME - if this fails bus reset ?? */
1672 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ);
1673 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no));
1674
1675/*
1676 * We have several special cases to consider during REQ/ACK handshaking :
1677 * 1. We were in MSGOUT phase, and we are on the last byte of the
1678 * message. ATN must be dropped as ACK is dropped.
1679 *
1680 * 2. We are in a MSGIN phase, and we are on the last byte of the
1681 * message. We must exit with ACK asserted, so that the calling
1682 * code may raise ATN before dropping ACK to reject the message.
1683 *
1684 * 3. ACK and ATN are clear and the target may proceed as normal.
1685 */
1686 if (!(p == PHASE_MSGIN && c == 1)) {
1687 if (p == PHASE_MSGOUT && c > 1)
1688 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1689 else
1690 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1691 }
1692 } while (--c);
1693
1694 dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c));
1695
1696 *count = c;
1697 *data = d;
1698 tmp = NCR5380_read(STATUS_REG);
1699 if (tmp & SR_REQ)
1700 *phase = tmp & PHASE_MASK;
1701 else
1702 *phase = PHASE_UNKNOWN;
1703
1704 if (!c || (*phase == p))
1705 return 0;
1706 else
1707 return -1;
1708}
1709
1710/**
1711 * do_reset - issue a reset command
1712 * @host: adapter to reset
1713 *
1714 * Issue a reset sequence to the NCR5380 and try and get the bus
1715 * back into sane shape.
1716 *
1717 * Locks: caller holds queue lock
1718 */
1719
1720static void do_reset(struct Scsi_Host *host) {
1721 NCR5380_local_declare();
1722 NCR5380_setup(host);
1723
1724 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
1725 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
1726 udelay(25);
1727 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1728}
1729
1730/*
1731 * Function : do_abort (Scsi_Host *host)
1732 *
1733 * Purpose : abort the currently established nexus. Should only be
1734 * called from a routine which can drop into a
1735 *
1736 * Returns : 0 on success, -1 on failure.
1737 *
1738 * Locks: queue lock held by caller
1739 * FIXME: sort this out and get new_eh running
1740 */
1741
1742static int do_abort(struct Scsi_Host *host) {
1743 NCR5380_local_declare();
1744 unsigned char *msgptr, phase, tmp;
1745 int len;
1746 int rc;
1747 NCR5380_setup(host);
1748
1749
1750 /* Request message out phase */
1751 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1752
1753 /*
1754 * Wait for the target to indicate a valid phase by asserting
1755 * REQ. Once this happens, we'll have either a MSGOUT phase
1756 * and can immediately send the ABORT message, or we'll have some
1757 * other phase and will have to source/sink data.
1758 *
1759 * We really don't care what value was on the bus or what value
1760 * the target sees, so we just handshake.
1761 */
1762
1763 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ);
1764
1765 if(rc < 0)
1766 return -1;
1767
1768 tmp = (unsigned char)rc;
1769
1770 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1771
1772 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1773 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1774 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ);
1775 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1776 if(rc == -1)
1777 return -1;
1778 }
1779 tmp = ABORT;
1780 msgptr = &tmp;
1781 len = 1;
1782 phase = PHASE_MSGOUT;
1783 NCR5380_transfer_pio(host, &phase, &len, &msgptr);
1784
1785 /*
1786 * If we got here, and the command completed successfully,
1787 * we're about to go into bus free state.
1788 */
1789
1790 return len ? -1 : 0;
1791}
1792
1793#if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL)
1794/*
1795 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1796 * unsigned char *phase, int *count, unsigned char **data)
1797 *
1798 * Purpose : transfers data in given phase using either real
1799 * or pseudo DMA.
1800 *
1801 * Inputs : instance - instance of driver, *phase - pointer to
1802 * what phase is expected, *count - pointer to number of
1803 * bytes to transfer, **data - pointer to data pointer.
1804 *
1805 * Returns : -1 when different phase is entered without transferring
1806 * maximum number of bytes, 0 if all bytes or transfered or exit
1807 * is in same phase.
1808 *
1809 * Also, *phase, *count, *data are modified in place.
1810 *
1811 * Locks: io_request lock held by caller
1812 */
1813
1814
1815static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1816 NCR5380_local_declare();
1817 register int c = *count;
1818 register unsigned char p = *phase;
1819 register unsigned char *d = *data;
1820 unsigned char tmp;
1821 int foo;
1822#if defined(REAL_DMA_POLL)
1823 int cnt, toPIO;
1824 unsigned char saved_data = 0, overrun = 0, residue;
1825#endif
1826
1827 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1828
1829 NCR5380_setup(instance);
1830
1831 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1832 *phase = tmp;
1833 return -1;
1834 }
1835#if defined(REAL_DMA) || defined(REAL_DMA_POLL)
1836#ifdef READ_OVERRUNS
1837 if (p & SR_IO) {
1838 c -= 2;
1839 }
1840#endif
1841 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));
1842 hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c);
1843#endif
1844
1845 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1846
1847#ifdef REAL_DMA
1848 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
1849#elif defined(REAL_DMA_POLL)
1850 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
1851#else
1852 /*
1853 * Note : on my sample board, watch-dog timeouts occurred when interrupts
1854 * were not disabled for the duration of a single DMA transfer, from
1855 * before the setting of DMA mode to after transfer of the last byte.
1856 */
1857
1858#if defined(PSEUDO_DMA) && defined(UNSAFE)
1859 spin_unlock_irq(instance->host_lock);
1860#endif
1861 /* KLL May need eop and parity in 53c400 */
1862 if (hostdata->flags & FLAG_NCR53C400)
1863 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR | MR_ENABLE_EOP_INTR | MR_DMA_MODE | MR_MONITOR_BSY);
1864 else
1865 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
1866#endif /* def REAL_DMA */
1867
1868 dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG)));
1869
1870 /*
1871 * On the PAS16 at least I/O recovery delays are not needed here.
1872 * Everyone else seems to want them.
1873 */
1874
1875 if (p & SR_IO) {
1876 io_recovery_delay(1);
1877 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1878 } else {
1879 io_recovery_delay(1);
1880 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1881 io_recovery_delay(1);
1882 NCR5380_write(START_DMA_SEND_REG, 0);
1883 io_recovery_delay(1);
1884 }
1885
1886#if defined(REAL_DMA_POLL)
1887 do {
1888 tmp = NCR5380_read(BUS_AND_STATUS_REG);
1889 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER)));
1890
1891/*
1892 At this point, either we've completed DMA, or we have a phase mismatch,
1893 or we've unexpectedly lost BUSY (which is a real error).
1894
1895 For write DMAs, we want to wait until the last byte has been
1896 transferred out over the bus before we turn off DMA mode. Alas, there
1897 seems to be no terribly good way of doing this on a 5380 under all
1898 conditions. For non-scatter-gather operations, we can wait until REQ
1899 and ACK both go false, or until a phase mismatch occurs. Gather-writes
1900 are nastier, since the device will be expecting more data than we
1901 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
1902 could test LAST BIT SENT to assure transfer (I imagine this is precisely
1903 why this signal was added to the newer chips) but on the older 538[01]
1904 this signal does not exist. The workaround for this lack is a watchdog;
1905 we bail out of the wait-loop after a modest amount of wait-time if
1906 the usual exit conditions are not met. Not a terribly clean or
1907 correct solution :-%
1908
1909 Reads are equally tricky due to a nasty characteristic of the NCR5380.
1910 If the chip is in DMA mode for an READ, it will respond to a target's
1911 REQ by latching the SCSI data into the INPUT DATA register and asserting
1912 ACK, even if it has _already_ been notified by the DMA controller that
1913 the current DMA transfer has completed! If the NCR5380 is then taken
1914 out of DMA mode, this already-acknowledged byte is lost.
1915
1916 This is not a problem for "one DMA transfer per command" reads, because
1917 the situation will never arise... either all of the data is DMA'ed
1918 properly, or the target switches to MESSAGE IN phase to signal a
1919 disconnection (either operation bringing the DMA to a clean halt).
1920 However, in order to handle scatter-reads, we must work around the
1921 problem. The chosen fix is to DMA N-2 bytes, then check for the
1922 condition before taking the NCR5380 out of DMA mode. One or two extra
1923 bytes are transferred via PIO as necessary to fill out the original
1924 request.
1925 */
1926
1927 if (p & SR_IO) {
1928#ifdef READ_OVERRUNS
1929 udelay(10);
1930 if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) {
1931 saved_data = NCR5380_read(INPUT_DATA_REGISTER);
1932 overrun = 1;
1933 }
1934#endif
1935 } else {
1936 int limit = 100;
1937 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) {
1938 if (!(tmp & BASR_PHASE_MATCH))
1939 break;
1940 if (--limit < 0)
1941 break;
1942 }
1943 }
1944
1945 dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG)));
1946
1947 NCR5380_write(MODE_REG, MR_BASE);
1948 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1949
1950 residue = NCR5380_dma_residual(instance);
1951 c -= residue;
1952 *count -= c;
1953 *data += c;
1954 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
1955
1956#ifdef READ_OVERRUNS
1957 if (*phase == p && (p & SR_IO) && residue == 0) {
1958 if (overrun) {
1959 dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n"));
1960 **data = saved_data;
1961 *data += 1;
1962 *count -= 1;
1963 cnt = toPIO = 1;
1964 } else {
1965 printk("No overrun??\n");
1966 cnt = toPIO = 2;
1967 }
1968 dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data));
1969 NCR5380_transfer_pio(instance, phase, &cnt, data);
1970 *count -= toPIO - cnt;
1971 }
1972#endif
1973
1974 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)));
1975 return 0;
1976
1977#elif defined(REAL_DMA)
1978 return 0;
1979#else /* defined(REAL_DMA_POLL) */
1980 if (p & SR_IO) {
1981#ifdef DMA_WORKS_RIGHT
1982 foo = NCR5380_pread(instance, d, c);
1983#else
1984 int diff = 1;
1985 if (hostdata->flags & FLAG_NCR53C400) {
1986 diff = 0;
1987 }
1988 if (!(foo = NCR5380_pread(instance, d, c - diff))) {
1989 /*
1990 * We can't disable DMA mode after successfully transferring
1991 * what we plan to be the last byte, since that would open up
1992 * a race condition where if the target asserted REQ before
1993 * we got the DMA mode reset, the NCR5380 would have latched
1994 * an additional byte into the INPUT DATA register and we'd
1995 * have dropped it.
1996 *
1997 * The workaround was to transfer one fewer bytes than we
1998 * intended to with the pseudo-DMA read function, wait for
1999 * the chip to latch the last byte, read it, and then disable
2000 * pseudo-DMA mode.
2001 *
2002 * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
2003 * REQ is deasserted when ACK is asserted, and not reasserted
2004 * until ACK goes false. Since the NCR5380 won't lower ACK
2005 * until DACK is asserted, which won't happen unless we twiddle
2006 * the DMA port or we take the NCR5380 out of DMA mode, we
2007 * can guarantee that we won't handshake another extra
2008 * byte.
2009 */
2010
2011 if (!(hostdata->flags & FLAG_NCR53C400)) {
2012 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ));
2013 /* Wait for clean handshake */
2014 while (NCR5380_read(STATUS_REG) & SR_REQ);
2015 d[c - 1] = NCR5380_read(INPUT_DATA_REG);
2016 }
2017 }
2018#endif
2019 } else {
2020#ifdef DMA_WORKS_RIGHT
2021 foo = NCR5380_pwrite(instance, d, c);
2022#else
2023 int timeout;
2024 dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c));
2025 if (!(foo = NCR5380_pwrite(instance, d, c))) {
2026 /*
2027 * Wait for the last byte to be sent. If REQ is being asserted for
2028 * the byte we're interested, we'll ACK it and it will go false.
2029 */
2030 if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) {
2031 timeout = 20000;
2032 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH));
2033
2034 if (!timeout)
2035 dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no));
2036
2037 if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) {
2038 hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT;
2039 if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) {
2040 hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT;
2041 dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no));
2042 }
2043 }
2044 } else {
2045 dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n"));
2046 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT));
2047 dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n"));
2048 }
2049 }
2050#endif
2051 }
2052 NCR5380_write(MODE_REG, MR_BASE);
2053 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2054
2055 if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) {
2056 dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n"));
2057 if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) {
2058 dprintk(NDEBUG_C400_PWRITE, ("53C400w: got it, reading reset interrupt reg\n"));
2059 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
2060 } else {
2061 printk("53C400w: IRQ NOT THERE!\n");
2062 }
2063 }
2064 *data = d + c;
2065 *count = 0;
2066 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
2067#if defined(PSEUDO_DMA) && defined(UNSAFE)
2068 spin_lock_irq(instance->host_lock);
2069#endif /* defined(REAL_DMA_POLL) */
2070 return foo;
2071#endif /* def REAL_DMA */
2072}
2073#endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */
2074
2075/*
2076 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
2077 *
2078 * Purpose : run through the various SCSI phases and do as the target
2079 * directs us to. Operates on the currently connected command,
2080 * instance->connected.
2081 *
2082 * Inputs : instance, instance for which we are doing commands
2083 *
2084 * Side effects : SCSI things happen, the disconnected queue will be
2085 * modified if a command disconnects, *instance->connected will
2086 * change.
2087 *
2088 * XXX Note : we need to watch for bus free or a reset condition here
2089 * to recover from an unexpected bus free condition.
2090 *
2091 * Locks: io_request_lock held by caller in IRQ mode
2092 */
2093
2094static void NCR5380_information_transfer(struct Scsi_Host *instance) {
2095 NCR5380_local_declare();
2096 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata;
2097 unsigned char msgout = NOP;
2098 int sink = 0;
2099 int len;
2100#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2101 int transfersize;
2102#endif
2103 unsigned char *data;
2104 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
2105 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
2106 /* RvC: we need to set the end of the polling time */
2107 unsigned long poll_time = jiffies + USLEEP_POLL;
2108
2109 NCR5380_setup(instance);
2110
2111 while (1) {
2112 tmp = NCR5380_read(STATUS_REG);
2113 /* We only have a valid SCSI phase when REQ is asserted */
2114 if (tmp & SR_REQ) {
2115 phase = (tmp & PHASE_MASK);
2116 if (phase != old_phase) {
2117 old_phase = phase;
2118 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance);
2119 }
2120 if (sink && (phase != PHASE_MSGOUT)) {
2121 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2122
2123 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
2124 while (NCR5380_read(STATUS_REG) & SR_REQ);
2125 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2126 sink = 0;
2127 continue;
2128 }
2129 switch (phase) {
2130 case PHASE_DATAIN:
2131 case PHASE_DATAOUT:
2132#if (NDEBUG & NDEBUG_NO_DATAOUT)
2133 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no);
2134 sink = 1;
2135 do_abort(instance);
2136 cmd->result = DID_ERROR << 16;
2137 cmd->done(cmd);
2138 return;
2139#endif
2140 /*
2141 * If there is no room left in the current buffer in the
2142 * scatter-gather list, move onto the next one.
2143 */
2144
2145 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2146 ++cmd->SCp.buffer;
2147 --cmd->SCp.buffers_residual;
2148 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2149 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+
2150 cmd->SCp.buffer->offset;
2151 dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual));
2152 }
2153 /*
2154 * The preferred transfer method is going to be
2155 * PSEUDO-DMA for systems that are strictly PIO,
2156 * since we can let the hardware do the handshaking.
2157 *
2158 * For this to work, we need to know the transfersize
2159 * ahead of time, since the pseudo-DMA code will sit
2160 * in an unconditional loop.
2161 */
2162
2163#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2164 /* KLL
2165 * PSEUDO_DMA is defined here. If this is the g_NCR5380
2166 * driver then it will always be defined, so the
2167 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
2168 * NCR5380 case. I think this is a fairly clean solution.
2169 * We supplement these 2 if's with the flag.
2170 */
2171#ifdef NCR5380_dma_xfer_len
2172 if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) {
2173#else
2174 transfersize = cmd->transfersize;
2175
2176#ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */
2177 if (transfersize > 512)
2178 transfersize = 512;
2179#endif /* LIMIT_TRANSFERSIZE */
2180
2181 if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) {
2182 /* Limit transfers to 32K, for xx400 & xx406
2183 * pseudoDMA that transfers in 128 bytes blocks. */
2184 if (transfersize > 32 * 1024)
2185 transfersize = 32 * 1024;
2186#endif
2187 len = transfersize;
2188 if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) {
2189 /*
2190 * If the watchdog timer fires, all future accesses to this
2191 * device will use the polled-IO.
2192 */
2193 printk("scsi%d : switching target %d lun %d to slow handshake\n", instance->host_no, cmd->device->id, cmd->device->lun);
2194 cmd->device->borken = 1;
2195 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2196 sink = 1;
2197 do_abort(instance);
2198 cmd->result = DID_ERROR << 16;
2199 cmd->done(cmd);
2200 /* XXX - need to source or sink data here, as appropriate */
2201 } else
2202 cmd->SCp.this_residual -= transfersize - len;
2203 } else
2204#endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */
2205 NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **)
2206 &cmd->SCp.ptr);
2207 break;
2208 case PHASE_MSGIN:
2209 len = 1;
2210 data = &tmp;
2211 NCR5380_transfer_pio(instance, &phase, &len, &data);
2212 cmd->SCp.Message = tmp;
2213
2214 switch (tmp) {
2215 /*
2216 * Linking lets us reduce the time required to get the
2217 * next command out to the device, hopefully this will
2218 * mean we don't waste another revolution due to the delays
2219 * required by ARBITRATION and another SELECTION.
2220 *
2221 * In the current implementation proposal, low level drivers
2222 * merely have to start the next command, pointed to by
2223 * next_link, done() is called as with unlinked commands.
2224 */
2225#ifdef LINKED
2226 case LINKED_CMD_COMPLETE:
2227 case LINKED_FLG_CMD_COMPLETE:
2228 /* Accept message by clearing ACK */
2229 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2230 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun));
2231 /*
2232 * Sanity check : A linked command should only terminate with
2233 * one of these messages if there are more linked commands
2234 * available.
2235 */
2236 if (!cmd->next_link) {
2237 printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun);
2238 sink = 1;
2239 do_abort(instance);
2240 return;
2241 }
2242 initialize_SCp(cmd->next_link);
2243 /* The next command is still part of this process */
2244 cmd->next_link->tag = cmd->tag;
2245 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2246 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun));
2247 collect_stats(hostdata, cmd);
2248 cmd->scsi_done(cmd);
2249 cmd = hostdata->connected;
2250 break;
2251#endif /* def LINKED */
2252 case ABORT:
2253 case COMMAND_COMPLETE:
2254 /* Accept message by clearing ACK */
2255 sink = 1;
2256 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2257 hostdata->connected = NULL;
2258 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun));
2259 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2260
2261 /*
2262 * I'm not sure what the correct thing to do here is :
2263 *
2264 * If the command that just executed is NOT a request
2265 * sense, the obvious thing to do is to set the result
2266 * code to the values of the stored parameters.
2267 *
2268 * If it was a REQUEST SENSE command, we need some way
2269 * to differentiate between the failure code of the original
2270 * and the failure code of the REQUEST sense - the obvious
2271 * case is success, where we fall through and leave the result
2272 * code unchanged.
2273 *
2274 * The non-obvious place is where the REQUEST SENSE failed
2275 */
2276
2277 if (cmd->cmnd[0] != REQUEST_SENSE)
2278 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2279 else if (status_byte(cmd->SCp.Status) != GOOD)
2280 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2281
2282#ifdef AUTOSENSE
2283 if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2284 dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no));
2285 cmd->cmnd[0] = REQUEST_SENSE;
2286 cmd->cmnd[1] &= 0xe0;
2287 cmd->cmnd[2] = 0;
2288 cmd->cmnd[3] = 0;
2289 cmd->cmnd[4] = sizeof(cmd->sense_buffer);
2290 cmd->cmnd[5] = 0;
2291
2292 cmd->SCp.buffer = NULL;
2293 cmd->SCp.buffers_residual = 0;
2294 cmd->SCp.ptr = (char *) cmd->sense_buffer;
2295 cmd->SCp.this_residual = sizeof(cmd->sense_buffer);
2296
2297 LIST(cmd, hostdata->issue_queue);
2298 cmd->host_scribble = (unsigned char *)
2299 hostdata->issue_queue;
2300 hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2301 dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no));
2302 } else
2303#endif /* def AUTOSENSE */
2304 {
2305 collect_stats(hostdata, cmd);
2306 cmd->scsi_done(cmd);
2307 }
2308
2309 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2310 /*
2311 * Restore phase bits to 0 so an interrupted selection,
2312 * arbitration can resume.
2313 */
2314 NCR5380_write(TARGET_COMMAND_REG, 0);
2315
2316 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2317 barrier();
2318 return;
2319 case MESSAGE_REJECT:
2320 /* Accept message by clearing ACK */
2321 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2322 switch (hostdata->last_message) {
2323 case HEAD_OF_QUEUE_TAG:
2324 case ORDERED_QUEUE_TAG:
2325 case SIMPLE_QUEUE_TAG:
2326 cmd->device->simple_tags = 0;
2327 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2328 break;
2329 default:
2330 break;
2331 }
2332 case DISCONNECT:{
2333 /* Accept message by clearing ACK */
2334 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2335 cmd->device->disconnect = 1;
2336 LIST(cmd, hostdata->disconnected_queue);
2337 cmd->host_scribble = (unsigned char *)
2338 hostdata->disconnected_queue;
2339 hostdata->connected = NULL;
2340 hostdata->disconnected_queue = cmd;
2341 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d lun %d was moved from connected to" " the disconnected_queue\n", instance->host_no, cmd->device->id, cmd->device->lun));
2342 /*
2343 * Restore phase bits to 0 so an interrupted selection,
2344 * arbitration can resume.
2345 */
2346 NCR5380_write(TARGET_COMMAND_REG, 0);
2347
2348 /* Enable reselect interrupts */
2349 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2350 /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/
2351 /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */
2352 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2353 barrier();
2354 return;
2355 }
2356 /*
2357 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2358 * operation, in violation of the SCSI spec so we can safely
2359 * ignore SAVE/RESTORE pointers calls.
2360 *
2361 * Unfortunately, some disks violate the SCSI spec and
2362 * don't issue the required SAVE_POINTERS message before
2363 * disconnecting, and we have to break spec to remain
2364 * compatible.
2365 */
2366 case SAVE_POINTERS:
2367 case RESTORE_POINTERS:
2368 /* Accept message by clearing ACK */
2369 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2370 break;
2371 case EXTENDED_MESSAGE:
2372/*
2373 * Extended messages are sent in the following format :
2374 * Byte
2375 * 0 EXTENDED_MESSAGE == 1
2376 * 1 length (includes one byte for code, doesn't
2377 * include first two bytes)
2378 * 2 code
2379 * 3..length+1 arguments
2380 *
2381 * Start the extended message buffer with the EXTENDED_MESSAGE
db9dff32005-04-03 14:53:59 -05002382 * byte, since scsi_print_msg() wants the whole thing.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002383 */
2384 extended_msg[0] = EXTENDED_MESSAGE;
2385 /* Accept first byte by clearing ACK */
2386 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2387 dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no));
2388
2389 len = 2;
2390 data = extended_msg + 1;
2391 phase = PHASE_MSGIN;
2392 NCR5380_transfer_pio(instance, &phase, &len, &data);
2393
2394 dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2]));
2395
2396 if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) {
2397 /* Accept third byte by clearing ACK */
2398 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2399 len = extended_msg[1] - 1;
2400 data = extended_msg + 3;
2401 phase = PHASE_MSGIN;
2402
2403 NCR5380_transfer_pio(instance, &phase, &len, &data);
2404 dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len));
2405
2406 switch (extended_msg[2]) {
2407 case EXTENDED_SDTR:
2408 case EXTENDED_WDTR:
2409 case EXTENDED_MODIFY_DATA_POINTER:
2410 case EXTENDED_EXTENDED_IDENTIFY:
2411 tmp = 0;
2412 }
2413 } else if (len) {
2414 printk("scsi%d: error receiving extended message\n", instance->host_no);
2415 tmp = 0;
2416 } else {
2417 printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]);
2418 tmp = 0;
2419 }
2420 /* Fall through to reject message */
2421
2422 /*
2423 * If we get something weird that we aren't expecting,
2424 * reject it.
2425 */
2426 default:
2427 if (!tmp) {
2428 printk("scsi%d: rejecting message ", instance->host_no);
db9dff32005-04-03 14:53:59 -05002429 scsi_print_msg(extended_msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002430 printk("\n");
2431 } else if (tmp != EXTENDED_MESSAGE)
2432 printk("scsi%d: rejecting unknown message %02x from target %d, lun %d\n", instance->host_no, tmp, cmd->device->id, cmd->device->lun);
2433 else
2434 printk("scsi%d: rejecting unknown extended message code %02x, length %d from target %d, lun %d\n", instance->host_no, extended_msg[1], extended_msg[0], cmd->device->id, cmd->device->lun);
2435
2436 msgout = MESSAGE_REJECT;
2437 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2438 break;
2439 } /* switch (tmp) */
2440 break;
2441 case PHASE_MSGOUT:
2442 len = 1;
2443 data = &msgout;
2444 hostdata->last_message = msgout;
2445 NCR5380_transfer_pio(instance, &phase, &len, &data);
2446 if (msgout == ABORT) {
2447 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2448 hostdata->connected = NULL;
2449 cmd->result = DID_ERROR << 16;
2450 collect_stats(hostdata, cmd);
2451 cmd->scsi_done(cmd);
2452 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2453 return;
2454 }
2455 msgout = NOP;
2456 break;
2457 case PHASE_CMDOUT:
2458 len = cmd->cmd_len;
2459 data = cmd->cmnd;
2460 /*
2461 * XXX for performance reasons, on machines with a
2462 * PSEUDO-DMA architecture we should probably
2463 * use the dma transfer function.
2464 */
2465 NCR5380_transfer_pio(instance, &phase, &len, &data);
2466 if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) {
2467 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
2468 dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
2469 return;
2470 }
2471 break;
2472 case PHASE_STATIN:
2473 len = 1;
2474 data = &tmp;
2475 NCR5380_transfer_pio(instance, &phase, &len, &data);
2476 cmd->SCp.Status = tmp;
2477 break;
2478 default:
2479 printk("scsi%d : unknown phase\n", instance->host_no);
2480 NCR5380_dprint(NDEBUG_ALL, instance);
2481 } /* switch(phase) */
2482 } /* if (tmp * SR_REQ) */
2483 else {
2484 /* RvC: go to sleep if polling time expired
2485 */
2486 if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) {
2487 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
2488 dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
2489 return;
2490 }
2491 }
2492 } /* while (1) */
2493}
2494
2495/*
2496 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2497 *
2498 * Purpose : does reselection, initializing the instance->connected
2499 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2500 * nexus has been reestablished,
2501 *
2502 * Inputs : instance - this instance of the NCR5380.
2503 *
2504 * Locks: io_request_lock held by caller if IRQ driven
2505 */
2506
2507static void NCR5380_reselect(struct Scsi_Host *instance) {
2508 NCR5380_local_declare();
2509 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
2510 instance->hostdata;
2511 unsigned char target_mask;
2512 unsigned char lun, phase;
2513 int len;
2514 unsigned char msg[3];
2515 unsigned char *data;
2516 Scsi_Cmnd *tmp = NULL, *prev;
2517 int abort = 0;
2518 NCR5380_setup(instance);
2519
2520 /*
2521 * Disable arbitration, etc. since the host adapter obviously
2522 * lost, and tell an interrupted NCR5380_select() to restart.
2523 */
2524
2525 NCR5380_write(MODE_REG, MR_BASE);
2526 hostdata->restart_select = 1;
2527
2528 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2529 dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no));
2530
2531 /*
2532 * At this point, we have detected that our SCSI ID is on the bus,
2533 * SEL is true and BSY was false for at least one bus settle delay
2534 * (400 ns).
2535 *
2536 * We must assert BSY ourselves, until the target drops the SEL
2537 * signal.
2538 */
2539
2540 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2541
2542 /* FIXME: timeout too long, must fail to workqueue */
2543 if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0)
2544 abort = 1;
2545
2546 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2547
2548 /*
2549 * Wait for target to go into MSGIN.
2550 * FIXME: timeout needed and fail to work queeu
2551 */
2552
2553 if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ))
2554 abort = 1;
2555
2556 len = 1;
2557 data = msg;
2558 phase = PHASE_MSGIN;
2559 NCR5380_transfer_pio(instance, &phase, &len, &data);
2560
2561 if (!(msg[0] & 0x80)) {
2562 printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no);
db9dff32005-04-03 14:53:59 -05002563 scsi_print_msg(msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002564 abort = 1;
2565 } else {
2566 /* Accept message by clearing ACK */
2567 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2568 lun = (msg[0] & 0x07);
2569
2570 /*
2571 * We need to add code for SCSI-II to track which devices have
2572 * I_T_L_Q nexuses established, and which have simple I_T_L
2573 * nexuses so we can chose to do additional data transfer.
2574 */
2575
2576 /*
2577 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2578 * just reestablished, and remove it from the disconnected queue.
2579 */
2580
2581
2582 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
2583 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2584 ) {
2585 if (prev) {
2586 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
2587 prev->host_scribble = tmp->host_scribble;
2588 } else {
2589 REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble);
2590 hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble;
2591 }
2592 tmp->host_scribble = NULL;
2593 break;
2594 }
2595 if (!tmp) {
2596 printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun);
2597 /*
2598 * Since we have an established nexus that we can't do anything with,
2599 * we must abort it.
2600 */
2601 abort = 1;
2602 }
2603 }
2604
2605 if (abort) {
2606 do_abort(instance);
2607 } else {
2608 hostdata->connected = tmp;
2609 dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag));
2610 }
2611}
2612
2613/*
2614 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
2615 *
2616 * Purpose : called by interrupt handler when DMA finishes or a phase
2617 * mismatch occurs (which would finish the DMA transfer).
2618 *
2619 * Inputs : instance - this instance of the NCR5380.
2620 *
2621 * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L
2622 * nexus has been reestablished, on failure NULL is returned.
2623 */
2624
2625#ifdef REAL_DMA
2626static void NCR5380_dma_complete(NCR5380_instance * instance) {
2627 NCR5380_local_declare();
2628 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata * instance->hostdata);
2629 int transferred;
2630 NCR5380_setup(instance);
2631
2632 /*
2633 * XXX this might not be right.
2634 *
2635 * Wait for final byte to transfer, ie wait for ACK to go false.
2636 *
2637 * We should use the Last Byte Sent bit, unfortunately this is
2638 * not available on the 5380/5381 (only the various CMOS chips)
2639 *
2640 * FIXME: timeout, and need to handle long timeout/irq case
2641 */
2642
2643 NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ);
2644
2645 NCR5380_write(MODE_REG, MR_BASE);
2646 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2647
2648 /*
2649 * The only places we should see a phase mismatch and have to send
2650 * data from the same set of pointers will be the data transfer
2651 * phases. So, residual, requested length are only important here.
2652 */
2653
2654 if (!(hostdata->connected->SCp.phase & SR_CD)) {
2655 transferred = instance->dmalen - NCR5380_dma_residual();
2656 hostdata->connected->SCp.this_residual -= transferred;
2657 hostdata->connected->SCp.ptr += transferred;
2658 }
2659}
2660#endif /* def REAL_DMA */
2661
2662/*
2663 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2664 *
2665 * Purpose : abort a command
2666 *
2667 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2668 * host byte of the result field to, if zero DID_ABORTED is
2669 * used.
2670 *
2671 * Returns : 0 - success, -1 on failure.
2672 *
2673 * XXX - there is no way to abort the command that is currently
2674 * connected, you have to wait for it to complete. If this is
2675 * a problem, we could implement longjmp() / setjmp(), setjmp()
2676 * called where the loop started in NCR5380_main().
2677 *
2678 * Locks: host lock taken by caller
2679 */
2680
2681static int NCR5380_abort(Scsi_Cmnd * cmd) {
2682 NCR5380_local_declare();
2683 struct Scsi_Host *instance = cmd->device->host;
2684 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
2685 Scsi_Cmnd *tmp, **prev;
2686
2687 printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no);
db9dff32005-04-03 14:53:59 -05002688 scsi_print_command(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002689
2690 NCR5380_print_status(instance);
2691
2692 NCR5380_setup(instance);
2693
2694 dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no));
2695 dprintk(NDEBUG_ABORT, (" basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG)));
2696
2697#if 0
2698/*
2699 * Case 1 : If the command is the currently executing command,
2700 * we'll set the aborted flag and return control so that
2701 * information transfer routine can exit cleanly.
2702 */
2703
2704 if (hostdata->connected == cmd) {
2705 dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no));
2706 hostdata->aborted = 1;
2707/*
2708 * We should perform BSY checking, and make sure we haven't slipped
2709 * into BUS FREE.
2710 */
2711
2712 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN);
2713/*
2714 * Since we can't change phases until we've completed the current
2715 * handshake, we have to source or sink a byte of data if the current
2716 * phase is not MSGOUT.
2717 */
2718
2719/*
2720 * Return control to the executing NCR drive so we can clear the
2721 * aborted flag and get back into our main loop.
2722 */
2723
2724 return 0;
2725 }
2726#endif
2727
2728/*
2729 * Case 2 : If the command hasn't been issued yet, we simply remove it
2730 * from the issue queue.
2731 */
2732
2733 dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no));
2734 for (prev = (Scsi_Cmnd **) & (hostdata->issue_queue), tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble)
2735 if (cmd == tmp) {
2736 REMOVE(5, *prev, tmp, tmp->host_scribble);
2737 (*prev) = (Scsi_Cmnd *) tmp->host_scribble;
2738 tmp->host_scribble = NULL;
2739 tmp->result = DID_ABORT << 16;
2740 dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no));
2741 tmp->done(tmp);
2742 return SUCCESS;
2743 }
2744#if (NDEBUG & NDEBUG_ABORT)
2745 /* KLL */
2746 else if (prev == tmp)
2747 printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no);
2748#endif
2749
2750/*
2751 * Case 3 : If any commands are connected, we're going to fail the abort
2752 * and let the high level SCSI driver retry at a later time or
2753 * issue a reset.
2754 *
2755 * Timeouts, and therefore aborted commands, will be highly unlikely
2756 * and handling them cleanly in this situation would make the common
2757 * case of noresets less efficient, and would pollute our code. So,
2758 * we fail.
2759 */
2760
2761 if (hostdata->connected) {
2762 dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no));
2763 return FAILED;
2764 }
2765/*
2766 * Case 4: If the command is currently disconnected from the bus, and
2767 * there are no connected commands, we reconnect the I_T_L or
2768 * I_T_L_Q nexus associated with it, go into message out, and send
2769 * an abort message.
2770 *
2771 * This case is especially ugly. In order to reestablish the nexus, we
2772 * need to call NCR5380_select(). The easiest way to implement this
2773 * function was to abort if the bus was busy, and let the interrupt
2774 * handler triggered on the SEL for reselect take care of lost arbitrations
2775 * where necessary, meaning interrupts need to be enabled.
2776 *
2777 * When interrupts are enabled, the queues may change - so we
2778 * can't remove it from the disconnected queue before selecting it
2779 * because that could cause a failure in hashing the nexus if that
2780 * device reselected.
2781 *
2782 * Since the queues may change, we can't use the pointers from when we
2783 * first locate it.
2784 *
2785 * So, we must first locate the command, and if NCR5380_select()
2786 * succeeds, then issue the abort, relocate the command and remove
2787 * it from the disconnected queue.
2788 */
2789
2790 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble)
2791 if (cmd == tmp) {
2792 dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no));
2793
2794 if (NCR5380_select(instance, cmd, (int) cmd->tag))
2795 return FAILED;
2796 dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no));
2797
2798 do_abort(instance);
2799
2800 for (prev = (Scsi_Cmnd **) & (hostdata->disconnected_queue), tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble)
2801 if (cmd == tmp) {
2802 REMOVE(5, *prev, tmp, tmp->host_scribble);
2803 *prev = (Scsi_Cmnd *) tmp->host_scribble;
2804 tmp->host_scribble = NULL;
2805 tmp->result = DID_ABORT << 16;
2806 tmp->done(tmp);
2807 return SUCCESS;
2808 }
2809 }
2810/*
2811 * Case 5 : If we reached this point, the command was not found in any of
2812 * the queues.
2813 *
2814 * We probably reached this point because of an unlikely race condition
2815 * between the command completing successfully and the abortion code,
2816 * so we won't panic, but we will notify the user in case something really
2817 * broke.
2818 */
2819 printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n"
2820 " before abortion\n", instance->host_no);
2821 return FAILED;
2822}
2823
2824
2825/*
2826 * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd)
2827 *
2828 * Purpose : reset the SCSI bus.
2829 *
2830 * Returns : SUCCESS
2831 *
2832 * Locks: host lock taken by caller
2833 */
2834
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04002835static int NCR5380_bus_reset(Scsi_Cmnd * cmd)
2836{
2837 struct Scsi_Host *instance = cmd->device->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002838
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04002839 NCR5380_local_declare();
2840 NCR5380_setup(instance);
2841 NCR5380_print_status(instance);
2842
2843 spin_lock_irq(instance->host_lock);
2844 do_reset(instance);
2845 spin_unlock_irq(instance->host_lock);
2846
Linus Torvalds1da177e2005-04-16 15:20:36 -07002847 return SUCCESS;
2848}