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1/*
2 * NCR 5380 generic driver routines. These should make it *trivial*
3 * to implement 5380 SCSI drivers under Linux with a non-trantor
4 * architecture.
5 *
6 * Note that these routines also work with NR53c400 family chips.
7 *
8 * Copyright 1993, Drew Eckhardt
9 * Visionary Computing
10 * (Unix and Linux consulting and custom programming)
11 * drew@colorado.edu
12 * +1 (303) 666-5836
13 *
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 */
89
90#if (NDEBUG & NDEBUG_LISTS)
91#define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); }
92#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); }
93#else
94#define LIST(x,y)
95#define REMOVE(w,x,y,z)
96#endif
97
98#ifndef notyet
99#undef LINKED
100#undef REAL_DMA
101#endif
102
103#ifdef REAL_DMA_POLL
104#undef READ_OVERRUNS
105#define READ_OVERRUNS
106#endif
107
108#ifdef BOARD_REQUIRES_NO_DELAY
109#define io_recovery_delay(x)
110#else
111#define io_recovery_delay(x) udelay(x)
112#endif
113
114/*
115 * Design
116 *
117 * This is a generic 5380 driver. To use it on a different platform,
118 * one simply writes appropriate system specific macros (ie, data
119 * transfer - some PC's will use the I/O bus, 68K's must use
120 * memory mapped) and drops this file in their 'C' wrapper.
121 *
122 * (Note from hch: unfortunately it was not enough for the different
123 * m68k folks and instead of improving this driver they copied it
124 * and hacked it up for their needs. As a consequence they lost
125 * most updates to this driver. Maybe someone will fix all these
126 * drivers to use a common core one day..)
127 *
128 * As far as command queueing, two queues are maintained for
129 * each 5380 in the system - commands that haven't been issued yet,
130 * and commands that are currently executing. This means that an
131 * unlimited number of commands may be queued, letting
132 * more commands propagate from the higher driver levels giving higher
133 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
134 * allowing multiple commands to propagate all the way to a SCSI-II device
135 * while a command is already executing.
136 *
137 *
138 * Issues specific to the NCR5380 :
139 *
140 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
141 * piece of hardware that requires you to sit in a loop polling for
142 * the REQ signal as long as you are connected. Some devices are
143 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
144 * while doing long seek operations.
145 *
146 * The workaround for this is to keep track of devices that have
147 * disconnected. If the device hasn't disconnected, for commands that
148 * should disconnect, we do something like
149 *
150 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
151 *
152 * Some tweaking of N and M needs to be done. An algorithm based
153 * on "time to data" would give the best results as long as short time
154 * to datas (ie, on the same track) were considered, however these
155 * broken devices are the exception rather than the rule and I'd rather
156 * spend my time optimizing for the normal case.
157 *
158 * Architecture :
159 *
160 * At the heart of the design is a coroutine, NCR5380_main,
161 * which is started from a workqueue for each NCR5380 host in the
162 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by
163 * removing the commands from the issue queue and calling
164 * NCR5380_select() if a nexus is not established.
165 *
166 * Once a nexus is established, the NCR5380_information_transfer()
167 * phase goes through the various phases as instructed by the target.
168 * if the target goes into MSG IN and sends a DISCONNECT message,
169 * the command structure is placed into the per instance disconnected
170 * queue, and NCR5380_main tries to find more work. If the target is
171 * idle for too long, the system will try to sleep.
172 *
173 * If a command has disconnected, eventually an interrupt will trigger,
174 * calling NCR5380_intr() which will in turn call NCR5380_reselect
175 * to reestablish a nexus. This will run main if necessary.
176 *
177 * On command termination, the done function will be called as
178 * appropriate.
179 *
180 * SCSI pointers are maintained in the SCp field of SCSI command
181 * structures, being initialized after the command is connected
182 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
183 * Note that in violation of the standard, an implicit SAVE POINTERS operation
184 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
185 */
186
187/*
188 * Using this file :
189 * This file a skeleton Linux SCSI driver for the NCR 5380 series
190 * of chips. To use it, you write an architecture specific functions
191 * and macros and include this file in your driver.
192 *
193 * These macros control options :
194 * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be
195 * defined.
196 *
197 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
198 * for commands that return with a CHECK CONDITION status.
199 *
200 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
201 * transceivers.
202 *
203 * DONT_USE_INTR - if defined, never use interrupts, even if we probe or
204 * override-configure an IRQ.
205 *
206 * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512
207 * bytes at a time. Since interrupts are disabled by default during
208 * these transfers, we might need this to give reasonable interrupt
209 * service time if the transfer size gets too large.
210 *
211 * LINKED - if defined, linked commands are supported.
212 *
213 * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases.
214 *
215 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
216 *
217 * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't
218 * rely on phase mismatch and EOP interrupts to determine end
219 * of phase.
220 *
221 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You
222 * only really want to use this if you're having a problem with
223 * dropped characters during high speed communications, and even
224 * then, you're going to be better off twiddling with transfersize
225 * in the high level code.
226 *
227 * Defaults for these will be provided although the user may want to adjust
228 * these to allocate CPU resources to the SCSI driver or "real" code.
229 *
230 * USLEEP_SLEEP - amount of time, in jiffies, to sleep
231 *
232 * USLEEP_POLL - amount of time, in jiffies, to poll
233 *
234 * These macros MUST be defined :
235 * NCR5380_local_declare() - declare any local variables needed for your
236 * transfer routines.
237 *
238 * NCR5380_setup(instance) - initialize any local variables needed from a given
239 * instance of the host adapter for NCR5380_{read,write,pread,pwrite}
240 *
241 * NCR5380_read(register) - read from the specified register
242 *
243 * NCR5380_write(register, value) - write to the specific register
244 *
245 * NCR5380_implementation_fields - additional fields needed for this
246 * specific implementation of the NCR5380
247 *
248 * Either real DMA *or* pseudo DMA may be implemented
249 * REAL functions :
250 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
251 * Note that the DMA setup functions should return the number of bytes
252 * that they were able to program the controller for.
253 *
254 * Also note that generic i386/PC versions of these macros are
255 * available as NCR5380_i386_dma_write_setup,
256 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
257 *
258 * NCR5380_dma_write_setup(instance, src, count) - initialize
259 * NCR5380_dma_read_setup(instance, dst, count) - initialize
260 * NCR5380_dma_residual(instance); - residual count
261 *
262 * PSEUDO functions :
263 * NCR5380_pwrite(instance, src, count)
264 * NCR5380_pread(instance, dst, count);
265 *
266 * The generic driver is initialized by calling NCR5380_init(instance),
267 * after setting the appropriate host specific fields and ID. If the
268 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
269 * possible) function may be used.
270 */
271
272static int do_abort(struct Scsi_Host *host);
273static void do_reset(struct Scsi_Host *host);
274
275/*
276 * initialize_SCp - init the scsi pointer field
277 * @cmd: command block to set up
278 *
279 * Set up the internal fields in the SCSI command.
280 */
281
282static __inline__ void initialize_SCp(Scsi_Cmnd * cmd)
283{
284 /*
285 * Initialize the Scsi Pointer field so that all of the commands in the
286 * various queues are valid.
287 */
288
289 if (cmd->use_sg) {
290 cmd->SCp.buffer = (struct scatterlist *) cmd->buffer;
291 cmd->SCp.buffers_residual = cmd->use_sg - 1;
292 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+
293 cmd->SCp.buffer->offset;
294 cmd->SCp.this_residual = cmd->SCp.buffer->length;
295 } else {
296 cmd->SCp.buffer = NULL;
297 cmd->SCp.buffers_residual = 0;
298 cmd->SCp.ptr = (char *) cmd->request_buffer;
299 cmd->SCp.this_residual = cmd->request_bufflen;
300 }
301}
302
303/**
304 * NCR5380_poll_politely - wait for NCR5380 status bits
305 * @instance: controller to poll
306 * @reg: 5380 register to poll
307 * @bit: Bitmask to check
308 * @val: Value required to exit
309 *
310 * Polls the NCR5380 in a reasonably efficient manner waiting for
311 * an event to occur, after a short quick poll we begin giving the
312 * CPU back in non IRQ contexts
313 *
314 * Returns the value of the register or a negative error code.
315 */
316
317static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t)
318{
319 NCR5380_local_declare();
320 int n = 500; /* At about 8uS a cycle for the cpu access */
321 unsigned long end = jiffies + t;
322 int r;
323
324 NCR5380_setup(instance);
325
326 while( n-- > 0)
327 {
328 r = NCR5380_read(reg);
329 if((r & bit) == val)
330 return 0;
331 cpu_relax();
332 }
333
334 /* t time yet ? */
335 while(time_before(jiffies, end))
336 {
337 r = NCR5380_read(reg);
338 if((r & bit) == val)
339 return 0;
340 if(!in_interrupt())
341 yield();
342 else
343 cpu_relax();
344 }
345 return -ETIMEDOUT;
346}
347
348static struct {
349 unsigned char value;
350 const char *name;
351} phases[] = {
352 {PHASE_DATAOUT, "DATAOUT"},
353 {PHASE_DATAIN, "DATAIN"},
354 {PHASE_CMDOUT, "CMDOUT"},
355 {PHASE_STATIN, "STATIN"},
356 {PHASE_MSGOUT, "MSGOUT"},
357 {PHASE_MSGIN, "MSGIN"},
358 {PHASE_UNKNOWN, "UNKNOWN"}
359};
360
361#ifdef NDEBUG
362static struct {
363 unsigned char mask;
364 const char *name;
365} signals[] = {
366 {SR_DBP, "PARITY"},
367 {SR_RST, "RST"},
368 {SR_BSY, "BSY"},
369 {SR_REQ, "REQ"},
370 {SR_MSG, "MSG"},
371 {SR_CD, "CD"},
372 {SR_IO, "IO"},
373 {SR_SEL, "SEL"},
374 {0, NULL}
375},
376basrs[] = {
377 {BASR_ATN, "ATN"},
378 {BASR_ACK, "ACK"},
379 {0, NULL}
380},
381icrs[] = {
382 {ICR_ASSERT_RST, "ASSERT RST"},
383 {ICR_ASSERT_ACK, "ASSERT ACK"},
384 {ICR_ASSERT_BSY, "ASSERT BSY"},
385 {ICR_ASSERT_SEL, "ASSERT SEL"},
386 {ICR_ASSERT_ATN, "ASSERT ATN"},
387 {ICR_ASSERT_DATA, "ASSERT DATA"},
388 {0, NULL}
389},
390mrs[] = {
391 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"},
392 {MR_TARGET, "MODE TARGET"},
393 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"},
394 {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"},
395 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
396 {MR_DMA_MODE, "MODE DMA"},
397 {MR_ARBITRATE, "MODE ARBITRATION"},
398 {0, NULL}
399};
400
401/**
402 * NCR5380_print - print scsi bus signals
403 * @instance: adapter state to dump
404 *
405 * Print the SCSI bus signals for debugging purposes
406 *
407 * Locks: caller holds hostdata lock (not essential)
408 */
409
410static void NCR5380_print(struct Scsi_Host *instance)
411{
412 NCR5380_local_declare();
413 unsigned char status, data, basr, mr, icr, i;
414 NCR5380_setup(instance);
415
416 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
417 status = NCR5380_read(STATUS_REG);
418 mr = NCR5380_read(MODE_REG);
419 icr = NCR5380_read(INITIATOR_COMMAND_REG);
420 basr = NCR5380_read(BUS_AND_STATUS_REG);
421
422 printk("STATUS_REG: %02x ", status);
423 for (i = 0; signals[i].mask; ++i)
424 if (status & signals[i].mask)
425 printk(",%s", signals[i].name);
426 printk("\nBASR: %02x ", basr);
427 for (i = 0; basrs[i].mask; ++i)
428 if (basr & basrs[i].mask)
429 printk(",%s", basrs[i].name);
430 printk("\nICR: %02x ", icr);
431 for (i = 0; icrs[i].mask; ++i)
432 if (icr & icrs[i].mask)
433 printk(",%s", icrs[i].name);
434 printk("\nMODE: %02x ", mr);
435 for (i = 0; mrs[i].mask; ++i)
436 if (mr & mrs[i].mask)
437 printk(",%s", mrs[i].name);
438 printk("\n");
439}
440
441
442/*
443 * NCR5380_print_phase - show SCSI phase
444 * @instance: adapter to dump
445 *
446 * Print the current SCSI phase for debugging purposes
447 *
448 * Locks: none
449 */
450
451static void NCR5380_print_phase(struct Scsi_Host *instance)
452{
453 NCR5380_local_declare();
454 unsigned char status;
455 int i;
456 NCR5380_setup(instance);
457
458 status = NCR5380_read(STATUS_REG);
459 if (!(status & SR_REQ))
460 printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no);
461 else {
462 for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i);
463 printk("scsi%d : phase %s\n", instance->host_no, phases[i].name);
464 }
465}
466#endif
467
468/*
469 * These need tweaking, and would probably work best as per-device
470 * flags initialized differently for disk, tape, cd, etc devices.
471 * People with broken devices are free to experiment as to what gives
472 * the best results for them.
473 *
474 * USLEEP_SLEEP should be a minimum seek time.
475 *
476 * USLEEP_POLL should be a maximum rotational latency.
477 */
478#ifndef USLEEP_SLEEP
479/* 20 ms (reasonable hard disk speed) */
480#define USLEEP_SLEEP (20*HZ/1000)
481#endif
482/* 300 RPM (floppy speed) */
483#ifndef USLEEP_POLL
484#define USLEEP_POLL (200*HZ/1000)
485#endif
486#ifndef USLEEP_WAITLONG
487/* RvC: (reasonable time to wait on select error) */
488#define USLEEP_WAITLONG USLEEP_SLEEP
489#endif
490
491/*
492 * Function : int should_disconnect (unsigned char cmd)
493 *
494 * Purpose : decide weather a command would normally disconnect or
495 * not, since if it won't disconnect we should go to sleep.
496 *
497 * Input : cmd - opcode of SCSI command
498 *
499 * Returns : DISCONNECT_LONG if we should disconnect for a really long
500 * time (ie always, sleep, look for REQ active, sleep),
501 * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal
502 * time-to-data delay, DISCONNECT_NONE if this command would return
503 * immediately.
504 *
505 * Future sleep algorithms based on time to data can exploit
506 * something like this so they can differentiate between "normal"
507 * (ie, read, write, seek) and unusual commands (ie, * format).
508 *
509 * Note : We don't deal with commands that handle an immediate disconnect,
510 *
511 */
512
513static int should_disconnect(unsigned char cmd)
514{
515 switch (cmd) {
516 case READ_6:
517 case WRITE_6:
518 case SEEK_6:
519 case READ_10:
520 case WRITE_10:
521 case SEEK_10:
522 return DISCONNECT_TIME_TO_DATA;
523 case FORMAT_UNIT:
524 case SEARCH_HIGH:
525 case SEARCH_LOW:
526 case SEARCH_EQUAL:
527 return DISCONNECT_LONG;
528 default:
529 return DISCONNECT_NONE;
530 }
531}
532
533static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout)
534{
535 hostdata->time_expires = jiffies + timeout;
536 schedule_delayed_work(&hostdata->coroutine, timeout);
537}
538
539
540static int probe_irq __initdata = 0;
541
542/**
543 * probe_intr - helper for IRQ autoprobe
544 * @irq: interrupt number
545 * @dev_id: unused
546 * @regs: unused
547 *
548 * Set a flag to indicate the IRQ in question was received. This is
549 * used by the IRQ probe code.
550 */
551
552static irqreturn_t __init probe_intr(int irq, void *dev_id,
553 struct pt_regs *regs)
554{
555 probe_irq = irq;
556 return IRQ_HANDLED;
557}
558
559/**
560 * NCR5380_probe_irq - find the IRQ of an NCR5380
561 * @instance: NCR5380 controller
562 * @possible: bitmask of ISA IRQ lines
563 *
564 * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ
565 * and then looking to see what interrupt actually turned up.
566 *
567 * Locks: none, irqs must be enabled on entry
568 */
569
570static int __init NCR5380_probe_irq(struct Scsi_Host *instance, int possible)
571{
572 NCR5380_local_declare();
573 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
574 unsigned long timeout;
575 int trying_irqs, i, mask;
576 NCR5380_setup(instance);
577
578 for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1)
579 if ((mask & possible) && (request_irq(i, &probe_intr, SA_INTERRUPT, "NCR-probe", NULL) == 0))
580 trying_irqs |= mask;
581
582 timeout = jiffies + (250 * HZ / 1000);
583 probe_irq = SCSI_IRQ_NONE;
584
585 /*
586 * A interrupt is triggered whenever BSY = false, SEL = true
587 * and a bit set in the SELECT_ENABLE_REG is asserted on the
588 * SCSI bus.
589 *
590 * Note that the bus is only driven when the phase control signals
591 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that
592 * to zero.
593 */
594
595 NCR5380_write(TARGET_COMMAND_REG, 0);
596 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
597 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
598 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL);
599
600 while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout))
601 {
602 set_current_state(TASK_UNINTERRUPTIBLE);
603 schedule_timeout(1);
604 }
605
606 NCR5380_write(SELECT_ENABLE_REG, 0);
607 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
608
609 for (i = 0, mask = 1; i < 16; ++i, mask <<= 1)
610 if (trying_irqs & mask)
611 free_irq(i, NULL);
612
613 return probe_irq;
614}
615
616/**
617 * NCR58380_print_options - show options
618 * @instance: unused for now
619 *
620 * Called by probe code indicating the NCR5380 driver options that
621 * were selected. At some point this will switch to runtime options
622 * read from the adapter in question
623 *
624 * Locks: none
625 */
626
627static void __init NCR5380_print_options(struct Scsi_Host *instance)
628{
629 printk(" generic options"
630#ifdef AUTOPROBE_IRQ
631 " AUTOPROBE_IRQ"
632#endif
633#ifdef AUTOSENSE
634 " AUTOSENSE"
635#endif
636#ifdef DIFFERENTIAL
637 " DIFFERENTIAL"
638#endif
639#ifdef REAL_DMA
640 " REAL DMA"
641#endif
642#ifdef REAL_DMA_POLL
643 " REAL DMA POLL"
644#endif
645#ifdef PARITY
646 " PARITY"
647#endif
648#ifdef PSEUDO_DMA
649 " PSEUDO DMA"
650#endif
651#ifdef UNSAFE
652 " UNSAFE "
653#endif
654 );
655 printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP);
656 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
657 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) {
658 printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE);
659 }
660}
661
662/**
663 * NCR5380_print_status - dump controller info
664 * @instance: controller to dump
665 *
666 * Print commands in the various queues, called from NCR5380_abort
667 * and NCR5380_debug to aid debugging.
668 *
669 * Locks: called functions disable irqs
670 */
671
672static void NCR5380_print_status(struct Scsi_Host *instance)
673{
674 NCR5380_dprint(NDEBUG_ANY, instance);
675 NCR5380_dprint_phase(NDEBUG_ANY, instance);
676}
677
678/******************************************/
679/*
680 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
681 *
682 * *buffer: I/O buffer
683 * **start: if inout == FALSE pointer into buffer where user read should start
684 * offset: current offset
685 * length: length of buffer
686 * hostno: Scsi_Host host_no
687 * inout: TRUE - user is writing; FALSE - user is reading
688 *
689 * Return the number of bytes read from or written
690 */
691
692#undef SPRINTF
693#define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0)
694static
695char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length);
696static
697char *lprint_command(unsigned char *cmd, char *pos, char *buffer, int len);
698static
699char *lprint_opcode(int opcode, char *pos, char *buffer, int length);
700
701static
702int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer, char **start, off_t offset, int length, int inout)
703{
704 char *pos = buffer;
705 struct NCR5380_hostdata *hostdata;
706 Scsi_Cmnd *ptr;
707
708 hostdata = (struct NCR5380_hostdata *) instance->hostdata;
709
710 if (inout) { /* Has data been written to the file ? */
711#ifdef DTC_PUBLIC_RELEASE
712 dtc_wmaxi = dtc_maxi = 0;
713#endif
714#ifdef PAS16_PUBLIC_RELEASE
715 pas_wmaxi = pas_maxi = 0;
716#endif
717 return (-ENOSYS); /* Currently this is a no-op */
718 }
719 SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE);
720 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400)
721 SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE);
722#ifdef DTC_PUBLIC_RELEASE
723 SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE);
724#endif
725#ifdef T128_PUBLIC_RELEASE
726 SPRINTF("T128 release %d", T128_PUBLIC_RELEASE);
727#endif
728#ifdef GENERIC_NCR5380_PUBLIC_RELEASE
729 SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE);
730#endif
731#ifdef PAS16_PUBLIC_RELEASE
732 SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE);
733#endif
734
735 SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base);
736 SPRINTF("io_port: %04x ", (int) instance->io_port);
737 if (instance->irq == SCSI_IRQ_NONE)
738 SPRINTF("IRQ: None.\n");
739 else
740 SPRINTF("IRQ: %d.\n", instance->irq);
741
742#ifdef DTC_PUBLIC_RELEASE
743 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi);
744#endif
745#ifdef PAS16_PUBLIC_RELEASE
746 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi);
747#endif
748 spin_lock_irq(instance->host_lock);
749 if (!hostdata->connected)
750 SPRINTF("scsi%d: no currently connected command\n", instance->host_no);
751 else
752 pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, pos, buffer, length);
753 SPRINTF("scsi%d: issue_queue\n", instance->host_no);
754 for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
755 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
756
757 SPRINTF("scsi%d: disconnected_queue\n", instance->host_no);
758 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
759 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
760 spin_unlock_irq(instance->host_lock);
761
762 *start = buffer;
763 if (pos - buffer < offset)
764 return 0;
765 else if (pos - buffer - offset < length)
766 return pos - buffer - offset;
767 return length;
768}
769
770static char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length)
771{
772 SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun);
773 SPRINTF(" command = ");
774 pos = lprint_command(cmd->cmnd, pos, buffer, length);
775 return (pos);
776}
777
778static char *lprint_command(unsigned char *command, char *pos, char *buffer, int length)
779{
780 int i, s;
781 pos = lprint_opcode(command[0], pos, buffer, length);
782 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
783 SPRINTF("%02x ", command[i]);
784 SPRINTF("\n");
785 return (pos);
786}
787
788static char *lprint_opcode(int opcode, char *pos, char *buffer, int length)
789{
790 SPRINTF("%2d (0x%02x)", opcode, opcode);
791 return (pos);
792}
793
794
795/**
796 * NCR5380_init - initialise an NCR5380
797 * @instance: adapter to configure
798 * @flags: control flags
799 *
800 * Initializes *instance and corresponding 5380 chip,
801 * with flags OR'd into the initial flags value.
802 *
803 * Notes : I assume that the host, hostno, and id bits have been
804 * set correctly. I don't care about the irq and other fields.
805 *
806 * Returns 0 for success
807 *
808 * Locks: interrupts must be enabled when we are called
809 */
810
811static int __devinit NCR5380_init(struct Scsi_Host *instance, int flags)
812{
813 NCR5380_local_declare();
814 int i, pass;
815 unsigned long timeout;
816 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
817
818 if(in_interrupt())
819 printk(KERN_ERR "NCR5380_init called with interrupts off!\n");
820 /*
821 * On NCR53C400 boards, NCR5380 registers are mapped 8 past
822 * the base address.
823 */
824
825#ifdef NCR53C400
826 if (flags & FLAG_NCR53C400)
827 instance->NCR5380_instance_name += NCR53C400_address_adjust;
828#endif
829
830 NCR5380_setup(instance);
831
832 hostdata->aborted = 0;
833 hostdata->id_mask = 1 << instance->this_id;
834 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
835 if (i > hostdata->id_mask)
836 hostdata->id_higher_mask |= i;
837 for (i = 0; i < 8; ++i)
838 hostdata->busy[i] = 0;
839#ifdef REAL_DMA
840 hostdata->dmalen = 0;
841#endif
842 hostdata->targets_present = 0;
843 hostdata->connected = NULL;
844 hostdata->issue_queue = NULL;
845 hostdata->disconnected_queue = NULL;
846
847 INIT_WORK(&hostdata->coroutine, NCR5380_main, hostdata);
848
849#ifdef NCR5380_STATS
850 for (i = 0; i < 8; ++i) {
851 hostdata->time_read[i] = 0;
852 hostdata->time_write[i] = 0;
853 hostdata->bytes_read[i] = 0;
854 hostdata->bytes_write[i] = 0;
855 }
856 hostdata->timebase = 0;
857 hostdata->pendingw = 0;
858 hostdata->pendingr = 0;
859#endif
860
861 /* The CHECK code seems to break the 53C400. Will check it later maybe */
862 if (flags & FLAG_NCR53C400)
863 hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags;
864 else
865 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags;
866
867 hostdata->host = instance;
868 hostdata->time_expires = 0;
869
870#ifndef AUTOSENSE
871 if ((instance->cmd_per_lun > 1) || instance->can_queue > 1)
872 printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n"
873 " be incorrectly cleared.\n", instance->host_no);
874#endif /* def AUTOSENSE */
875
876 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
877 NCR5380_write(MODE_REG, MR_BASE);
878 NCR5380_write(TARGET_COMMAND_REG, 0);
879 NCR5380_write(SELECT_ENABLE_REG, 0);
880
881#ifdef NCR53C400
882 if (hostdata->flags & FLAG_NCR53C400) {
883 NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
884 }
885#endif
886
887 /*
888 * Detect and correct bus wedge problems.
889 *
890 * If the system crashed, it may have crashed in a state
891 * where a SCSI command was still executing, and the
892 * SCSI bus is not in a BUS FREE STATE.
893 *
894 * If this is the case, we'll try to abort the currently
895 * established nexus which we know nothing about, and that
896 * failing, do a hard reset of the SCSI bus
897 */
898
899 for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) {
900 switch (pass) {
901 case 1:
902 case 3:
903 case 5:
904 printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no);
905 timeout = jiffies + 5 * HZ;
906 NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ);
907 break;
908 case 2:
909 printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no);
910 do_abort(instance);
911 break;
912 case 4:
913 printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no);
914 do_reset(instance);
915 break;
916 case 6:
917 printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no);
918 return -ENXIO;
919 }
920 }
921 return 0;
922}
923
924/**
925 * NCR5380_exit - remove an NCR5380
926 * @instance: adapter to remove
927 */
928
929static void __devexit NCR5380_exit(struct Scsi_Host *instance)
930{
931 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
932
933 cancel_delayed_work(&hostdata->coroutine);
934 flush_scheduled_work();
935}
936
937/**
938 * NCR5380_queue_command - queue a command
939 * @cmd: SCSI command
940 * @done: completion handler
941 *
942 * cmd is added to the per instance issue_queue, with minor
943 * twiddling done to the host specific fields of cmd. If the
944 * main coroutine is not running, it is restarted.
945 *
946 * Locks: host lock taken by caller
947 */
948
949static int NCR5380_queue_command(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
950{
951 struct Scsi_Host *instance = cmd->device->host;
952 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
953 Scsi_Cmnd *tmp;
954
955#if (NDEBUG & NDEBUG_NO_WRITE)
956 switch (cmd->cmnd[0]) {
957 case WRITE_6:
958 case WRITE_10:
959 printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no);
960 cmd->result = (DID_ERROR << 16);
961 done(cmd);
962 return 0;
963 }
964#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
965
966#ifdef NCR5380_STATS
967 switch (cmd->cmnd[0]) {
968 case WRITE:
969 case WRITE_6:
970 case WRITE_10:
971 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
972 hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;
973 hostdata->pendingw++;
974 break;
975 case READ:
976 case READ_6:
977 case READ_10:
978 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
979 hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;
980 hostdata->pendingr++;
981 break;
982 }
983#endif
984
985 /*
986 * We use the host_scribble field as a pointer to the next command
987 * in a queue
988 */
989
990 cmd->host_scribble = NULL;
991 cmd->scsi_done = done;
992 cmd->result = 0;
993
994 /*
995 * Insert the cmd into the issue queue. Note that REQUEST SENSE
996 * commands are added to the head of the queue since any command will
997 * clear the contingent allegiance condition that exists and the
998 * sense data is only guaranteed to be valid while the condition exists.
999 */
1000
1001 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
1002 LIST(cmd, hostdata->issue_queue);
1003 cmd->host_scribble = (unsigned char *) hostdata->issue_queue;
1004 hostdata->issue_queue = cmd;
1005 } else {
1006 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble);
1007 LIST(cmd, tmp);
1008 tmp->host_scribble = (unsigned char *) cmd;
1009 }
1010 dprintk(NDEBUG_QUEUES, ("scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"));
1011
1012 /* Run the coroutine if it isn't already running. */
1013 /* Kick off command processing */
1014 schedule_work(&hostdata->coroutine);
1015 return 0;
1016}
1017
1018
1019/**
1020 * NCR5380_main - NCR state machines
1021 *
1022 * NCR5380_main is a coroutine that runs as long as more work can
1023 * be done on the NCR5380 host adapters in a system. Both
1024 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1025 * in case it is not running.
1026 *
1027 * Locks: called as its own thread with no locks held. Takes the
1028 * host lock and called routines may take the isa dma lock.
1029 */
1030
1031static void NCR5380_main(void *p)
1032{
1033 struct NCR5380_hostdata *hostdata = p;
1034 struct Scsi_Host *instance = hostdata->host;
1035 Scsi_Cmnd *tmp, *prev;
1036 int done;
1037
1038 spin_lock_irq(instance->host_lock);
1039 do {
1040 /* Lock held here */
1041 done = 1;
1042 if (!hostdata->connected && !hostdata->selecting) {
1043 dprintk(NDEBUG_MAIN, ("scsi%d : not connected\n", instance->host_no));
1044 /*
1045 * Search through the issue_queue for a command destined
1046 * for a target that's not busy.
1047 */
1048 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
1049 {
1050 if (prev != tmp)
1051 dprintk(NDEBUG_LISTS, ("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun));
1052 /* When we find one, remove it from the issue queue. */
1053 if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) {
1054 if (prev) {
1055 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
1056 prev->host_scribble = tmp->host_scribble;
1057 } else {
1058 REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble);
1059 hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble;
1060 }
1061 tmp->host_scribble = NULL;
1062
1063 /*
1064 * Attempt to establish an I_T_L nexus here.
1065 * On success, instance->hostdata->connected is set.
1066 * On failure, we must add the command back to the
1067 * issue queue so we can keep trying.
1068 */
1069 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));
1070
1071 /*
1072 * A successful selection is defined as one that
1073 * leaves us with the command connected and
1074 * in hostdata->connected, OR has terminated the
1075 * command.
1076 *
1077 * With successful commands, we fall through
1078 * and see if we can do an information transfer,
1079 * with failures we will restart.
1080 */
1081 hostdata->selecting = NULL;
1082 /* RvC: have to preset this to indicate a new command is being performed */
1083
1084 if (!NCR5380_select(instance, tmp,
1085 /*
1086 * REQUEST SENSE commands are issued without tagged
1087 * queueing, even on SCSI-II devices because the
1088 * contingent allegiance condition exists for the
1089 * entire unit.
1090 */
1091 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
1092 break;
1093 } else {
1094 LIST(tmp, hostdata->issue_queue);
1095 tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1096 hostdata->issue_queue = tmp;
1097 done = 0;
1098 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no));
1099 }
1100 /* lock held here still */
1101 } /* if target/lun is not busy */
1102 } /* for */
1103 /* exited locked */
1104 } /* if (!hostdata->connected) */
1105 if (hostdata->selecting) {
1106 tmp = (Scsi_Cmnd *) hostdata->selecting;
1107 /* Selection will drop and retake the lock */
1108 if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
1109 /* Ok ?? */
1110 } else {
1111 /* RvC: device failed, so we wait a long time
1112 this is needed for Mustek scanners, that
1113 do not respond to commands immediately
1114 after a scan */
1115 printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id);
1116 LIST(tmp, hostdata->issue_queue);
1117 tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1118 hostdata->issue_queue = tmp;
1119 NCR5380_set_timer(hostdata, USLEEP_WAITLONG);
1120 }
1121 } /* if hostdata->selecting */
1122 if (hostdata->connected
1123#ifdef REAL_DMA
1124 && !hostdata->dmalen
1125#endif
1126 && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies))
1127 ) {
1128 dprintk(NDEBUG_MAIN, ("scsi%d : main() : performing information transfer\n", instance->host_no));
1129 NCR5380_information_transfer(instance);
1130 dprintk(NDEBUG_MAIN, ("scsi%d : main() : done set false\n", instance->host_no));
1131 done = 0;
1132 } else
1133 break;
1134 } while (!done);
1135
1136 spin_unlock_irq(instance->host_lock);
1137}
1138
1139#ifndef DONT_USE_INTR
1140
1141/**
1142 * NCR5380_intr - generic NCR5380 irq handler
1143 * @irq: interrupt number
1144 * @dev_id: device info
1145 * @regs: registers (unused)
1146 *
1147 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1148 * from the disconnected queue, and restarting NCR5380_main()
1149 * as required.
1150 *
1151 * Locks: takes the needed instance locks
1152 */
1153
1154static irqreturn_t NCR5380_intr(int irq, void *dev_id, struct pt_regs *regs)
1155{
1156 NCR5380_local_declare();
1157 struct Scsi_Host *instance = (struct Scsi_Host *)dev_id;
1158 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1159 int done;
1160 unsigned char basr;
1161 unsigned long flags;
1162
1163 dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n", irq));
1164
1165 do {
1166 done = 1;
1167 spin_lock_irqsave(instance->host_lock, flags);
1168 /* Look for pending interrupts */
1169 NCR5380_setup(instance);
1170 basr = NCR5380_read(BUS_AND_STATUS_REG);
1171 /* XXX dispatch to appropriate routine if found and done=0 */
1172 if (basr & BASR_IRQ) {
1173 NCR5380_dprint(NDEBUG_INTR, instance);
1174 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1175 done = 0;
1176 dprintk(NDEBUG_INTR, ("scsi%d : SEL interrupt\n", instance->host_no));
1177 NCR5380_reselect(instance);
1178 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1179 } else if (basr & BASR_PARITY_ERROR) {
1180 dprintk(NDEBUG_INTR, ("scsi%d : PARITY interrupt\n", instance->host_no));
1181 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1182 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1183 dprintk(NDEBUG_INTR, ("scsi%d : RESET interrupt\n", instance->host_no));
1184 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1185 } else {
1186#if defined(REAL_DMA)
1187 /*
1188 * We should only get PHASE MISMATCH and EOP interrupts
1189 * if we have DMA enabled, so do a sanity check based on
1190 * the current setting of the MODE register.
1191 */
1192
1193 if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) {
1194 int transfered;
1195
1196 if (!hostdata->connected)
1197 panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno);
1198
1199 transfered = (hostdata->dmalen - NCR5380_dma_residual(instance));
1200 hostdata->connected->SCp.this_residual -= transferred;
1201 hostdata->connected->SCp.ptr += transferred;
1202 hostdata->dmalen = 0;
1203
1204 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1205
1206 /* FIXME: we need to poll briefly then defer a workqueue task ! */
1207 NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ);
1208
1209 NCR5380_write(MODE_REG, MR_BASE);
1210 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1211 }
1212#else
1213 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)));
1214 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1215#endif
1216 }
1217 } /* if BASR_IRQ */
1218 spin_unlock_irqrestore(instance->host_lock, flags);
1219 if(!done)
1220 schedule_work(&hostdata->coroutine);
1221 } while (!done);
1222 return IRQ_HANDLED;
1223}
1224
1225#endif
1226
1227/**
1228 * collect_stats - collect stats on a scsi command
1229 * @hostdata: adapter
1230 * @cmd: command being issued
1231 *
1232 * Update the statistical data by parsing the command in question
1233 */
1234
1235static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd)
1236{
1237#ifdef NCR5380_STATS
1238 switch (cmd->cmnd[0]) {
1239 case WRITE:
1240 case WRITE_6:
1241 case WRITE_10:
1242 hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
1243 hostdata->pendingw--;
1244 break;
1245 case READ:
1246 case READ_6:
1247 case READ_10:
1248 hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
1249 hostdata->pendingr--;
1250 break;
1251 }
1252#endif
1253}
1254
1255
1256/*
1257 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
1258 * int tag);
1259 *
1260 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1261 * including ARBITRATION, SELECTION, and initial message out for
1262 * IDENTIFY and queue messages.
1263 *
1264 * Inputs : instance - instantiation of the 5380 driver on which this
1265 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1266 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1267 * the command that is presently connected.
1268 *
1269 * Returns : -1 if selection could not execute for some reason,
1270 * 0 if selection succeeded or failed because the target
1271 * did not respond.
1272 *
1273 * Side effects :
1274 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1275 * with registers as they should have been on entry - ie
1276 * SELECT_ENABLE will be set appropriately, the NCR5380
1277 * will cease to drive any SCSI bus signals.
1278 *
1279 * If successful : I_T_L or I_T_L_Q nexus will be established,
1280 * instance->connected will be set to cmd.
1281 * SELECT interrupt will be disabled.
1282 *
1283 * If failed (no target) : cmd->scsi_done() will be called, and the
1284 * cmd->result host byte set to DID_BAD_TARGET.
1285 *
1286 * Locks: caller holds hostdata lock in IRQ mode
1287 */
1288
1289static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag)
1290{
1291 NCR5380_local_declare();
1292 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1293 unsigned char tmp[3], phase;
1294 unsigned char *data;
1295 int len;
1296 unsigned long timeout;
1297 unsigned char value;
1298 int err;
1299 NCR5380_setup(instance);
1300
1301 if (hostdata->selecting)
1302 goto part2;
1303
1304 hostdata->restart_select = 0;
1305
1306 NCR5380_dprint(NDEBUG_ARBITRATION, instance);
1307 dprintk(NDEBUG_ARBITRATION, ("scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id));
1308
1309 /*
1310 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1311 * data bus during SELECTION.
1312 */
1313
1314 NCR5380_write(TARGET_COMMAND_REG, 0);
1315
1316 /*
1317 * Start arbitration.
1318 */
1319
1320 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1321 NCR5380_write(MODE_REG, MR_ARBITRATE);
1322
1323
1324 /* We can be relaxed here, interrupts are on, we are
1325 in workqueue context, the birds are singing in the trees */
1326 spin_unlock_irq(instance->host_lock);
1327 err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ);
1328 spin_lock_irq(instance->host_lock);
1329 if (err < 0) {
1330 printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__);
1331 NCR5380_write(MODE_REG, MR_BASE);
1332 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1333 goto failed;
1334 }
1335
1336 dprintk(NDEBUG_ARBITRATION, ("scsi%d : arbitration complete\n", instance->host_no));
1337
1338 /*
1339 * The arbitration delay is 2.2us, but this is a minimum and there is
1340 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1341 * the integral nature of udelay().
1342 *
1343 */
1344
1345 udelay(3);
1346
1347 /* Check for lost arbitration */
1348 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)) {
1349 NCR5380_write(MODE_REG, MR_BASE);
1350 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no));
1351 goto failed;
1352 }
1353 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL);
1354
1355 if (!(hostdata->flags & FLAG_DTC3181E) &&
1356 /* RvC: DTC3181E has some trouble with this
1357 * so we simply removed it. Seems to work with
1358 * only Mustek scanner attached
1359 */
1360 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
1361 NCR5380_write(MODE_REG, MR_BASE);
1362 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1363 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no));
1364 goto failed;
1365 }
1366 /*
1367 * Again, bus clear + bus settle time is 1.2us, however, this is
1368 * a minimum so we'll udelay ceil(1.2)
1369 */
1370
1371 udelay(2);
1372
1373 dprintk(NDEBUG_ARBITRATION, ("scsi%d : won arbitration\n", instance->host_no));
1374
1375 /*
1376 * Now that we have won arbitration, start Selection process, asserting
1377 * the host and target ID's on the SCSI bus.
1378 */
1379
1380 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
1381
1382 /*
1383 * Raise ATN while SEL is true before BSY goes false from arbitration,
1384 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1385 * phase immediately after selection.
1386 */
1387
1388 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1389 NCR5380_write(MODE_REG, MR_BASE);
1390
1391 /*
1392 * Reselect interrupts must be turned off prior to the dropping of BSY,
1393 * otherwise we will trigger an interrupt.
1394 */
1395 NCR5380_write(SELECT_ENABLE_REG, 0);
1396
1397 /*
1398 * The initiator shall then wait at least two deskew delays and release
1399 * the BSY signal.
1400 */
1401 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1402
1403 /* Reset BSY */
1404 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1405
1406 /*
1407 * Something weird happens when we cease to drive BSY - looks
1408 * like the board/chip is letting us do another read before the
1409 * appropriate propagation delay has expired, and we're confusing
1410 * a BSY signal from ourselves as the target's response to SELECTION.
1411 *
1412 * A small delay (the 'C++' frontend breaks the pipeline with an
1413 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1414 * tighter 'C' code breaks and requires this) solves the problem -
1415 * the 1 us delay is arbitrary, and only used because this delay will
1416 * be the same on other platforms and since it works here, it should
1417 * work there.
1418 *
1419 * wingel suggests that this could be due to failing to wait
1420 * one deskew delay.
1421 */
1422
1423 udelay(1);
1424
1425 dprintk(NDEBUG_SELECTION, ("scsi%d : selecting target %d\n", instance->host_no, cmd->device->id));
1426
1427 /*
1428 * The SCSI specification calls for a 250 ms timeout for the actual
1429 * selection.
1430 */
1431
1432 timeout = jiffies + (250 * HZ / 1000);
1433
1434 /*
1435 * XXX very interesting - we're seeing a bounce where the BSY we
1436 * asserted is being reflected / still asserted (propagation delay?)
1437 * and it's detecting as true. Sigh.
1438 */
1439
1440 hostdata->select_time = 0; /* we count the clock ticks at which we polled */
1441 hostdata->selecting = cmd;
1442
1443part2:
1444 /* RvC: here we enter after a sleeping period, or immediately after
1445 execution of part 1
1446 we poll only once ech clock tick */
1447 value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO);
1448
1449 if (!value && (hostdata->select_time < HZ/4)) {
1450 /* RvC: we still must wait for a device response */
1451 hostdata->select_time++; /* after 25 ticks the device has failed */
1452 NCR5380_set_timer(hostdata, 1);
1453 return 0; /* RvC: we return here with hostdata->selecting set,
1454 to go to sleep */
1455 }
1456
1457 hostdata->selecting = NULL;/* clear this pointer, because we passed the
1458 waiting period */
1459 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1460 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1461 NCR5380_reselect(instance);
1462 printk("scsi%d : reselection after won arbitration?\n", instance->host_no);
1463 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1464 return -1;
1465 }
1466 /*
1467 * No less than two deskew delays after the initiator detects the
1468 * BSY signal is true, it shall release the SEL signal and may
1469 * change the DATA BUS. -wingel
1470 */
1471
1472 udelay(1);
1473
1474 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1475
1476 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1477 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1478 if (hostdata->targets_present & (1 << cmd->device->id)) {
1479 printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no);
1480 if (hostdata->restart_select)
1481 printk(KERN_DEBUG "\trestart select\n");
1482 NCR5380_dprint(NDEBUG_SELECTION, instance);
1483 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1484 return -1;
1485 }
1486 cmd->result = DID_BAD_TARGET << 16;
1487 collect_stats(hostdata, cmd);
1488 cmd->scsi_done(cmd);
1489 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1490 dprintk(NDEBUG_SELECTION, ("scsi%d : target did not respond within 250ms\n", instance->host_no));
1491 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1492 return 0;
1493 }
1494 hostdata->targets_present |= (1 << cmd->device->id);
1495
1496 /*
1497 * Since we followed the SCSI spec, and raised ATN while SEL
1498 * was true but before BSY was false during selection, the information
1499 * transfer phase should be a MESSAGE OUT phase so that we can send the
1500 * IDENTIFY message.
1501 *
1502 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1503 * message (2 bytes) with a tag ID that we increment with every command
1504 * until it wraps back to 0.
1505 *
1506 * XXX - it turns out that there are some broken SCSI-II devices,
1507 * which claim to support tagged queuing but fail when more than
1508 * some number of commands are issued at once.
1509 */
1510
1511 /* Wait for start of REQ/ACK handshake */
1512
1513 spin_unlock_irq(instance->host_lock);
1514 err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ);
1515 spin_lock_irq(instance->host_lock);
1516
1517 if(err) {
1518 printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__);
1519 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1520 goto failed;
1521 }
1522
1523 dprintk(NDEBUG_SELECTION, ("scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id));
1524 tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun);
1525
1526 len = 1;
1527 cmd->tag = 0;
1528
1529 /* Send message(s) */
1530 data = tmp;
1531 phase = PHASE_MSGOUT;
1532 NCR5380_transfer_pio(instance, &phase, &len, &data);
1533 dprintk(NDEBUG_SELECTION, ("scsi%d : nexus established.\n", instance->host_no));
1534 /* XXX need to handle errors here */
1535 hostdata->connected = cmd;
1536 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1537
1538 if (cmd->SCp.ptr != (char *)cmd->sense_buffer) {
1539 initialize_SCp(cmd);
1540 }
1541
1542 return 0;
1543
1544 /* Selection failed */
1545failed:
1546 return -1;
1547
1548}
1549
1550/*
1551 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1552 * unsigned char *phase, int *count, unsigned char **data)
1553 *
1554 * Purpose : transfers data in given phase using polled I/O
1555 *
1556 * Inputs : instance - instance of driver, *phase - pointer to
1557 * what phase is expected, *count - pointer to number of
1558 * bytes to transfer, **data - pointer to data pointer.
1559 *
1560 * Returns : -1 when different phase is entered without transferring
1561 * maximum number of bytes, 0 if all bytes or transfered or exit
1562 * is in same phase.
1563 *
1564 * Also, *phase, *count, *data are modified in place.
1565 *
1566 * XXX Note : handling for bus free may be useful.
1567 */
1568
1569/*
1570 * Note : this code is not as quick as it could be, however it
1571 * IS 100% reliable, and for the actual data transfer where speed
1572 * counts, we will always do a pseudo DMA or DMA transfer.
1573 */
1574
1575static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1576 NCR5380_local_declare();
1577 unsigned char p = *phase, tmp;
1578 int c = *count;
1579 unsigned char *d = *data;
1580 /*
1581 * RvC: some administrative data to process polling time
1582 */
1583 int break_allowed = 0;
1584 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1585 NCR5380_setup(instance);
1586
1587 if (!(p & SR_IO))
1588 dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c));
1589 else
1590 dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c));
1591
1592 /*
1593 * The NCR5380 chip will only drive the SCSI bus when the
1594 * phase specified in the appropriate bits of the TARGET COMMAND
1595 * REGISTER match the STATUS REGISTER
1596 */
1597
1598 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1599
1600 /* RvC: don't know if this is necessary, but other SCSI I/O is short
1601 * so breaks are not necessary there
1602 */
1603 if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) {
1604 break_allowed = 1;
1605 }
1606 do {
1607 /*
1608 * Wait for assertion of REQ, after which the phase bits will be
1609 * valid
1610 */
1611
1612 /* RvC: we simply poll once, after that we stop temporarily
1613 * and let the device buffer fill up
1614 * if breaking is not allowed, we keep polling as long as needed
1615 */
1616
1617 /* FIXME */
1618 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed);
1619 if (!(tmp & SR_REQ)) {
1620 /* timeout condition */
1621 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
1622 break;
1623 }
1624
1625 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no));
1626
1627 /* Check for phase mismatch */
1628 if ((tmp & PHASE_MASK) != p) {
1629 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no));
1630 NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance);
1631 break;
1632 }
1633 /* Do actual transfer from SCSI bus to / from memory */
1634 if (!(p & SR_IO))
1635 NCR5380_write(OUTPUT_DATA_REG, *d);
1636 else
1637 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1638
1639 ++d;
1640
1641 /*
1642 * The SCSI standard suggests that in MSGOUT phase, the initiator
1643 * should drop ATN on the last byte of the message phase
1644 * after REQ has been asserted for the handshake but before
1645 * the initiator raises ACK.
1646 */
1647
1648 if (!(p & SR_IO)) {
1649 if (!((p & SR_MSG) && c > 1)) {
1650 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1651 NCR5380_dprint(NDEBUG_PIO, instance);
1652 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1653 } else {
1654 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1655 NCR5380_dprint(NDEBUG_PIO, instance);
1656 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1657 }
1658 } else {
1659 NCR5380_dprint(NDEBUG_PIO, instance);
1660 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1661 }
1662
1663 /* FIXME - if this fails bus reset ?? */
1664 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ);
1665 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no));
1666
1667/*
1668 * We have several special cases to consider during REQ/ACK handshaking :
1669 * 1. We were in MSGOUT phase, and we are on the last byte of the
1670 * message. ATN must be dropped as ACK is dropped.
1671 *
1672 * 2. We are in a MSGIN phase, and we are on the last byte of the
1673 * message. We must exit with ACK asserted, so that the calling
1674 * code may raise ATN before dropping ACK to reject the message.
1675 *
1676 * 3. ACK and ATN are clear and the target may proceed as normal.
1677 */
1678 if (!(p == PHASE_MSGIN && c == 1)) {
1679 if (p == PHASE_MSGOUT && c > 1)
1680 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1681 else
1682 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1683 }
1684 } while (--c);
1685
1686 dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c));
1687
1688 *count = c;
1689 *data = d;
1690 tmp = NCR5380_read(STATUS_REG);
1691 if (tmp & SR_REQ)
1692 *phase = tmp & PHASE_MASK;
1693 else
1694 *phase = PHASE_UNKNOWN;
1695
1696 if (!c || (*phase == p))
1697 return 0;
1698 else
1699 return -1;
1700}
1701
1702/**
1703 * do_reset - issue a reset command
1704 * @host: adapter to reset
1705 *
1706 * Issue a reset sequence to the NCR5380 and try and get the bus
1707 * back into sane shape.
1708 *
1709 * Locks: caller holds queue lock
1710 */
1711
1712static void do_reset(struct Scsi_Host *host) {
1713 NCR5380_local_declare();
1714 NCR5380_setup(host);
1715
1716 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
1717 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
1718 udelay(25);
1719 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1720}
1721
1722/*
1723 * Function : do_abort (Scsi_Host *host)
1724 *
1725 * Purpose : abort the currently established nexus. Should only be
1726 * called from a routine which can drop into a
1727 *
1728 * Returns : 0 on success, -1 on failure.
1729 *
1730 * Locks: queue lock held by caller
1731 * FIXME: sort this out and get new_eh running
1732 */
1733
1734static int do_abort(struct Scsi_Host *host) {
1735 NCR5380_local_declare();
1736 unsigned char *msgptr, phase, tmp;
1737 int len;
1738 int rc;
1739 NCR5380_setup(host);
1740
1741
1742 /* Request message out phase */
1743 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1744
1745 /*
1746 * Wait for the target to indicate a valid phase by asserting
1747 * REQ. Once this happens, we'll have either a MSGOUT phase
1748 * and can immediately send the ABORT message, or we'll have some
1749 * other phase and will have to source/sink data.
1750 *
1751 * We really don't care what value was on the bus or what value
1752 * the target sees, so we just handshake.
1753 */
1754
1755 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ);
1756
1757 if(rc < 0)
1758 return -1;
1759
1760 tmp = (unsigned char)rc;
1761
1762 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1763
1764 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1765 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1766 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ);
1767 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1768 if(rc == -1)
1769 return -1;
1770 }
1771 tmp = ABORT;
1772 msgptr = &tmp;
1773 len = 1;
1774 phase = PHASE_MSGOUT;
1775 NCR5380_transfer_pio(host, &phase, &len, &msgptr);
1776
1777 /*
1778 * If we got here, and the command completed successfully,
1779 * we're about to go into bus free state.
1780 */
1781
1782 return len ? -1 : 0;
1783}
1784
1785#if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL)
1786/*
1787 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1788 * unsigned char *phase, int *count, unsigned char **data)
1789 *
1790 * Purpose : transfers data in given phase using either real
1791 * or pseudo DMA.
1792 *
1793 * Inputs : instance - instance of driver, *phase - pointer to
1794 * what phase is expected, *count - pointer to number of
1795 * bytes to transfer, **data - pointer to data pointer.
1796 *
1797 * Returns : -1 when different phase is entered without transferring
1798 * maximum number of bytes, 0 if all bytes or transfered or exit
1799 * is in same phase.
1800 *
1801 * Also, *phase, *count, *data are modified in place.
1802 *
1803 * Locks: io_request lock held by caller
1804 */
1805
1806
1807static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1808 NCR5380_local_declare();
1809 register int c = *count;
1810 register unsigned char p = *phase;
1811 register unsigned char *d = *data;
1812 unsigned char tmp;
1813 int foo;
1814#if defined(REAL_DMA_POLL)
1815 int cnt, toPIO;
1816 unsigned char saved_data = 0, overrun = 0, residue;
1817#endif
1818
1819 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1820
1821 NCR5380_setup(instance);
1822
1823 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1824 *phase = tmp;
1825 return -1;
1826 }
1827#if defined(REAL_DMA) || defined(REAL_DMA_POLL)
1828#ifdef READ_OVERRUNS
1829 if (p & SR_IO) {
1830 c -= 2;
1831 }
1832#endif
1833 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));
1834 hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c);
1835#endif
1836
1837 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1838
1839#ifdef REAL_DMA
1840 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
1841#elif defined(REAL_DMA_POLL)
1842 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
1843#else
1844 /*
1845 * Note : on my sample board, watch-dog timeouts occurred when interrupts
1846 * were not disabled for the duration of a single DMA transfer, from
1847 * before the setting of DMA mode to after transfer of the last byte.
1848 */
1849
1850#if defined(PSEUDO_DMA) && defined(UNSAFE)
1851 spin_unlock_irq(instance->host_lock);
1852#endif
1853 /* KLL May need eop and parity in 53c400 */
1854 if (hostdata->flags & FLAG_NCR53C400)
1855 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);
1856 else
1857 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
1858#endif /* def REAL_DMA */
1859
1860 dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG)));
1861
1862 /*
1863 * On the PAS16 at least I/O recovery delays are not needed here.
1864 * Everyone else seems to want them.
1865 */
1866
1867 if (p & SR_IO) {
1868 io_recovery_delay(1);
1869 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1870 } else {
1871 io_recovery_delay(1);
1872 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1873 io_recovery_delay(1);
1874 NCR5380_write(START_DMA_SEND_REG, 0);
1875 io_recovery_delay(1);
1876 }
1877
1878#if defined(REAL_DMA_POLL)
1879 do {
1880 tmp = NCR5380_read(BUS_AND_STATUS_REG);
1881 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER)));
1882
1883/*
1884 At this point, either we've completed DMA, or we have a phase mismatch,
1885 or we've unexpectedly lost BUSY (which is a real error).
1886
1887 For write DMAs, we want to wait until the last byte has been
1888 transferred out over the bus before we turn off DMA mode. Alas, there
1889 seems to be no terribly good way of doing this on a 5380 under all
1890 conditions. For non-scatter-gather operations, we can wait until REQ
1891 and ACK both go false, or until a phase mismatch occurs. Gather-writes
1892 are nastier, since the device will be expecting more data than we
1893 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
1894 could test LAST BIT SENT to assure transfer (I imagine this is precisely
1895 why this signal was added to the newer chips) but on the older 538[01]
1896 this signal does not exist. The workaround for this lack is a watchdog;
1897 we bail out of the wait-loop after a modest amount of wait-time if
1898 the usual exit conditions are not met. Not a terribly clean or
1899 correct solution :-%
1900
1901 Reads are equally tricky due to a nasty characteristic of the NCR5380.
1902 If the chip is in DMA mode for an READ, it will respond to a target's
1903 REQ by latching the SCSI data into the INPUT DATA register and asserting
1904 ACK, even if it has _already_ been notified by the DMA controller that
1905 the current DMA transfer has completed! If the NCR5380 is then taken
1906 out of DMA mode, this already-acknowledged byte is lost.
1907
1908 This is not a problem for "one DMA transfer per command" reads, because
1909 the situation will never arise... either all of the data is DMA'ed
1910 properly, or the target switches to MESSAGE IN phase to signal a
1911 disconnection (either operation bringing the DMA to a clean halt).
1912 However, in order to handle scatter-reads, we must work around the
1913 problem. The chosen fix is to DMA N-2 bytes, then check for the
1914 condition before taking the NCR5380 out of DMA mode. One or two extra
1915 bytes are transferred via PIO as necessary to fill out the original
1916 request.
1917 */
1918
1919 if (p & SR_IO) {
1920#ifdef READ_OVERRUNS
1921 udelay(10);
1922 if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) {
1923 saved_data = NCR5380_read(INPUT_DATA_REGISTER);
1924 overrun = 1;
1925 }
1926#endif
1927 } else {
1928 int limit = 100;
1929 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) {
1930 if (!(tmp & BASR_PHASE_MATCH))
1931 break;
1932 if (--limit < 0)
1933 break;
1934 }
1935 }
1936
1937 dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG)));
1938
1939 NCR5380_write(MODE_REG, MR_BASE);
1940 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1941
1942 residue = NCR5380_dma_residual(instance);
1943 c -= residue;
1944 *count -= c;
1945 *data += c;
1946 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
1947
1948#ifdef READ_OVERRUNS
1949 if (*phase == p && (p & SR_IO) && residue == 0) {
1950 if (overrun) {
1951 dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n"));
1952 **data = saved_data;
1953 *data += 1;
1954 *count -= 1;
1955 cnt = toPIO = 1;
1956 } else {
1957 printk("No overrun??\n");
1958 cnt = toPIO = 2;
1959 }
1960 dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data));
1961 NCR5380_transfer_pio(instance, phase, &cnt, data);
1962 *count -= toPIO - cnt;
1963 }
1964#endif
1965
1966 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)));
1967 return 0;
1968
1969#elif defined(REAL_DMA)
1970 return 0;
1971#else /* defined(REAL_DMA_POLL) */
1972 if (p & SR_IO) {
1973#ifdef DMA_WORKS_RIGHT
1974 foo = NCR5380_pread(instance, d, c);
1975#else
1976 int diff = 1;
1977 if (hostdata->flags & FLAG_NCR53C400) {
1978 diff = 0;
1979 }
1980 if (!(foo = NCR5380_pread(instance, d, c - diff))) {
1981 /*
1982 * We can't disable DMA mode after successfully transferring
1983 * what we plan to be the last byte, since that would open up
1984 * a race condition where if the target asserted REQ before
1985 * we got the DMA mode reset, the NCR5380 would have latched
1986 * an additional byte into the INPUT DATA register and we'd
1987 * have dropped it.
1988 *
1989 * The workaround was to transfer one fewer bytes than we
1990 * intended to with the pseudo-DMA read function, wait for
1991 * the chip to latch the last byte, read it, and then disable
1992 * pseudo-DMA mode.
1993 *
1994 * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
1995 * REQ is deasserted when ACK is asserted, and not reasserted
1996 * until ACK goes false. Since the NCR5380 won't lower ACK
1997 * until DACK is asserted, which won't happen unless we twiddle
1998 * the DMA port or we take the NCR5380 out of DMA mode, we
1999 * can guarantee that we won't handshake another extra
2000 * byte.
2001 */
2002
2003 if (!(hostdata->flags & FLAG_NCR53C400)) {
2004 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ));
2005 /* Wait for clean handshake */
2006 while (NCR5380_read(STATUS_REG) & SR_REQ);
2007 d[c - 1] = NCR5380_read(INPUT_DATA_REG);
2008 }
2009 }
2010#endif
2011 } else {
2012#ifdef DMA_WORKS_RIGHT
2013 foo = NCR5380_pwrite(instance, d, c);
2014#else
2015 int timeout;
2016 dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c));
2017 if (!(foo = NCR5380_pwrite(instance, d, c))) {
2018 /*
2019 * Wait for the last byte to be sent. If REQ is being asserted for
2020 * the byte we're interested, we'll ACK it and it will go false.
2021 */
2022 if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) {
2023 timeout = 20000;
2024 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH));
2025
2026 if (!timeout)
2027 dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no));
2028
2029 if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) {
2030 hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT;
2031 if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) {
2032 hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT;
2033 dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no));
2034 }
2035 }
2036 } else {
2037 dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n"));
2038 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT));
2039 dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n"));
2040 }
2041 }
2042#endif
2043 }
2044 NCR5380_write(MODE_REG, MR_BASE);
2045 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2046
2047 if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) {
2048 dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n"));
2049 if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) {
2050 dprintk(NDEBUG_C400_PWRITE, ("53C400w: got it, reading reset interrupt reg\n"));
2051 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
2052 } else {
2053 printk("53C400w: IRQ NOT THERE!\n");
2054 }
2055 }
2056 *data = d + c;
2057 *count = 0;
2058 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
2059#if defined(PSEUDO_DMA) && defined(UNSAFE)
2060 spin_lock_irq(instance->host_lock);
2061#endif /* defined(REAL_DMA_POLL) */
2062 return foo;
2063#endif /* def REAL_DMA */
2064}
2065#endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */
2066
2067/*
2068 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
2069 *
2070 * Purpose : run through the various SCSI phases and do as the target
2071 * directs us to. Operates on the currently connected command,
2072 * instance->connected.
2073 *
2074 * Inputs : instance, instance for which we are doing commands
2075 *
2076 * Side effects : SCSI things happen, the disconnected queue will be
2077 * modified if a command disconnects, *instance->connected will
2078 * change.
2079 *
2080 * XXX Note : we need to watch for bus free or a reset condition here
2081 * to recover from an unexpected bus free condition.
2082 *
2083 * Locks: io_request_lock held by caller in IRQ mode
2084 */
2085
2086static void NCR5380_information_transfer(struct Scsi_Host *instance) {
2087 NCR5380_local_declare();
2088 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata;
2089 unsigned char msgout = NOP;
2090 int sink = 0;
2091 int len;
2092#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2093 int transfersize;
2094#endif
2095 unsigned char *data;
2096 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
2097 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
2098 /* RvC: we need to set the end of the polling time */
2099 unsigned long poll_time = jiffies + USLEEP_POLL;
2100
2101 NCR5380_setup(instance);
2102
2103 while (1) {
2104 tmp = NCR5380_read(STATUS_REG);
2105 /* We only have a valid SCSI phase when REQ is asserted */
2106 if (tmp & SR_REQ) {
2107 phase = (tmp & PHASE_MASK);
2108 if (phase != old_phase) {
2109 old_phase = phase;
2110 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance);
2111 }
2112 if (sink && (phase != PHASE_MSGOUT)) {
2113 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2114
2115 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
2116 while (NCR5380_read(STATUS_REG) & SR_REQ);
2117 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2118 sink = 0;
2119 continue;
2120 }
2121 switch (phase) {
2122 case PHASE_DATAIN:
2123 case PHASE_DATAOUT:
2124#if (NDEBUG & NDEBUG_NO_DATAOUT)
2125 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no);
2126 sink = 1;
2127 do_abort(instance);
2128 cmd->result = DID_ERROR << 16;
2129 cmd->done(cmd);
2130 return;
2131#endif
2132 /*
2133 * If there is no room left in the current buffer in the
2134 * scatter-gather list, move onto the next one.
2135 */
2136
2137 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2138 ++cmd->SCp.buffer;
2139 --cmd->SCp.buffers_residual;
2140 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2141 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+
2142 cmd->SCp.buffer->offset;
2143 dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual));
2144 }
2145 /*
2146 * The preferred transfer method is going to be
2147 * PSEUDO-DMA for systems that are strictly PIO,
2148 * since we can let the hardware do the handshaking.
2149 *
2150 * For this to work, we need to know the transfersize
2151 * ahead of time, since the pseudo-DMA code will sit
2152 * in an unconditional loop.
2153 */
2154
2155#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2156 /* KLL
2157 * PSEUDO_DMA is defined here. If this is the g_NCR5380
2158 * driver then it will always be defined, so the
2159 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
2160 * NCR5380 case. I think this is a fairly clean solution.
2161 * We supplement these 2 if's with the flag.
2162 */
2163#ifdef NCR5380_dma_xfer_len
2164 if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) {
2165#else
2166 transfersize = cmd->transfersize;
2167
2168#ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */
2169 if (transfersize > 512)
2170 transfersize = 512;
2171#endif /* LIMIT_TRANSFERSIZE */
2172
2173 if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) {
2174 /* Limit transfers to 32K, for xx400 & xx406
2175 * pseudoDMA that transfers in 128 bytes blocks. */
2176 if (transfersize > 32 * 1024)
2177 transfersize = 32 * 1024;
2178#endif
2179 len = transfersize;
2180 if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) {
2181 /*
2182 * If the watchdog timer fires, all future accesses to this
2183 * device will use the polled-IO.
2184 */
2185 printk("scsi%d : switching target %d lun %d to slow handshake\n", instance->host_no, cmd->device->id, cmd->device->lun);
2186 cmd->device->borken = 1;
2187 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2188 sink = 1;
2189 do_abort(instance);
2190 cmd->result = DID_ERROR << 16;
2191 cmd->done(cmd);
2192 /* XXX - need to source or sink data here, as appropriate */
2193 } else
2194 cmd->SCp.this_residual -= transfersize - len;
2195 } else
2196#endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */
2197 NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **)
2198 &cmd->SCp.ptr);
2199 break;
2200 case PHASE_MSGIN:
2201 len = 1;
2202 data = &tmp;
2203 NCR5380_transfer_pio(instance, &phase, &len, &data);
2204 cmd->SCp.Message = tmp;
2205
2206 switch (tmp) {
2207 /*
2208 * Linking lets us reduce the time required to get the
2209 * next command out to the device, hopefully this will
2210 * mean we don't waste another revolution due to the delays
2211 * required by ARBITRATION and another SELECTION.
2212 *
2213 * In the current implementation proposal, low level drivers
2214 * merely have to start the next command, pointed to by
2215 * next_link, done() is called as with unlinked commands.
2216 */
2217#ifdef LINKED
2218 case LINKED_CMD_COMPLETE:
2219 case LINKED_FLG_CMD_COMPLETE:
2220 /* Accept message by clearing ACK */
2221 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2222 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun));
2223 /*
2224 * Sanity check : A linked command should only terminate with
2225 * one of these messages if there are more linked commands
2226 * available.
2227 */
2228 if (!cmd->next_link) {
2229 printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun);
2230 sink = 1;
2231 do_abort(instance);
2232 return;
2233 }
2234 initialize_SCp(cmd->next_link);
2235 /* The next command is still part of this process */
2236 cmd->next_link->tag = cmd->tag;
2237 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2238 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));
2239 collect_stats(hostdata, cmd);
2240 cmd->scsi_done(cmd);
2241 cmd = hostdata->connected;
2242 break;
2243#endif /* def LINKED */
2244 case ABORT:
2245 case COMMAND_COMPLETE:
2246 /* Accept message by clearing ACK */
2247 sink = 1;
2248 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2249 hostdata->connected = NULL;
2250 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun));
2251 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2252
2253 /*
2254 * I'm not sure what the correct thing to do here is :
2255 *
2256 * If the command that just executed is NOT a request
2257 * sense, the obvious thing to do is to set the result
2258 * code to the values of the stored parameters.
2259 *
2260 * If it was a REQUEST SENSE command, we need some way
2261 * to differentiate between the failure code of the original
2262 * and the failure code of the REQUEST sense - the obvious
2263 * case is success, where we fall through and leave the result
2264 * code unchanged.
2265 *
2266 * The non-obvious place is where the REQUEST SENSE failed
2267 */
2268
2269 if (cmd->cmnd[0] != REQUEST_SENSE)
2270 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2271 else if (status_byte(cmd->SCp.Status) != GOOD)
2272 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2273
2274#ifdef AUTOSENSE
2275 if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2276 dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no));
2277 cmd->cmnd[0] = REQUEST_SENSE;
2278 cmd->cmnd[1] &= 0xe0;
2279 cmd->cmnd[2] = 0;
2280 cmd->cmnd[3] = 0;
2281 cmd->cmnd[4] = sizeof(cmd->sense_buffer);
2282 cmd->cmnd[5] = 0;
2283
2284 cmd->SCp.buffer = NULL;
2285 cmd->SCp.buffers_residual = 0;
2286 cmd->SCp.ptr = (char *) cmd->sense_buffer;
2287 cmd->SCp.this_residual = sizeof(cmd->sense_buffer);
2288
2289 LIST(cmd, hostdata->issue_queue);
2290 cmd->host_scribble = (unsigned char *)
2291 hostdata->issue_queue;
2292 hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2293 dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no));
2294 } else
2295#endif /* def AUTOSENSE */
2296 {
2297 collect_stats(hostdata, cmd);
2298 cmd->scsi_done(cmd);
2299 }
2300
2301 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2302 /*
2303 * Restore phase bits to 0 so an interrupted selection,
2304 * arbitration can resume.
2305 */
2306 NCR5380_write(TARGET_COMMAND_REG, 0);
2307
2308 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2309 barrier();
2310 return;
2311 case MESSAGE_REJECT:
2312 /* Accept message by clearing ACK */
2313 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2314 switch (hostdata->last_message) {
2315 case HEAD_OF_QUEUE_TAG:
2316 case ORDERED_QUEUE_TAG:
2317 case SIMPLE_QUEUE_TAG:
2318 cmd->device->simple_tags = 0;
2319 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2320 break;
2321 default:
2322 break;
2323 }
2324 case DISCONNECT:{
2325 /* Accept message by clearing ACK */
2326 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2327 cmd->device->disconnect = 1;
2328 LIST(cmd, hostdata->disconnected_queue);
2329 cmd->host_scribble = (unsigned char *)
2330 hostdata->disconnected_queue;
2331 hostdata->connected = NULL;
2332 hostdata->disconnected_queue = cmd;
2333 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));
2334 /*
2335 * Restore phase bits to 0 so an interrupted selection,
2336 * arbitration can resume.
2337 */
2338 NCR5380_write(TARGET_COMMAND_REG, 0);
2339
2340 /* Enable reselect interrupts */
2341 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2342 /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/
2343 /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */
2344 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2345 barrier();
2346 return;
2347 }
2348 /*
2349 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2350 * operation, in violation of the SCSI spec so we can safely
2351 * ignore SAVE/RESTORE pointers calls.
2352 *
2353 * Unfortunately, some disks violate the SCSI spec and
2354 * don't issue the required SAVE_POINTERS message before
2355 * disconnecting, and we have to break spec to remain
2356 * compatible.
2357 */
2358 case SAVE_POINTERS:
2359 case RESTORE_POINTERS:
2360 /* Accept message by clearing ACK */
2361 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2362 break;
2363 case EXTENDED_MESSAGE:
2364/*
2365 * Extended messages are sent in the following format :
2366 * Byte
2367 * 0 EXTENDED_MESSAGE == 1
2368 * 1 length (includes one byte for code, doesn't
2369 * include first two bytes)
2370 * 2 code
2371 * 3..length+1 arguments
2372 *
2373 * Start the extended message buffer with the EXTENDED_MESSAGE
2374 * byte, since print_msg() wants the whole thing.
2375 */
2376 extended_msg[0] = EXTENDED_MESSAGE;
2377 /* Accept first byte by clearing ACK */
2378 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2379 dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no));
2380
2381 len = 2;
2382 data = extended_msg + 1;
2383 phase = PHASE_MSGIN;
2384 NCR5380_transfer_pio(instance, &phase, &len, &data);
2385
2386 dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2]));
2387
2388 if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) {
2389 /* Accept third byte by clearing ACK */
2390 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2391 len = extended_msg[1] - 1;
2392 data = extended_msg + 3;
2393 phase = PHASE_MSGIN;
2394
2395 NCR5380_transfer_pio(instance, &phase, &len, &data);
2396 dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len));
2397
2398 switch (extended_msg[2]) {
2399 case EXTENDED_SDTR:
2400 case EXTENDED_WDTR:
2401 case EXTENDED_MODIFY_DATA_POINTER:
2402 case EXTENDED_EXTENDED_IDENTIFY:
2403 tmp = 0;
2404 }
2405 } else if (len) {
2406 printk("scsi%d: error receiving extended message\n", instance->host_no);
2407 tmp = 0;
2408 } else {
2409 printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]);
2410 tmp = 0;
2411 }
2412 /* Fall through to reject message */
2413
2414 /*
2415 * If we get something weird that we aren't expecting,
2416 * reject it.
2417 */
2418 default:
2419 if (!tmp) {
2420 printk("scsi%d: rejecting message ", instance->host_no);
2421 print_msg(extended_msg);
2422 printk("\n");
2423 } else if (tmp != EXTENDED_MESSAGE)
2424 printk("scsi%d: rejecting unknown message %02x from target %d, lun %d\n", instance->host_no, tmp, cmd->device->id, cmd->device->lun);
2425 else
2426 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);
2427
2428 msgout = MESSAGE_REJECT;
2429 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2430 break;
2431 } /* switch (tmp) */
2432 break;
2433 case PHASE_MSGOUT:
2434 len = 1;
2435 data = &msgout;
2436 hostdata->last_message = msgout;
2437 NCR5380_transfer_pio(instance, &phase, &len, &data);
2438 if (msgout == ABORT) {
2439 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2440 hostdata->connected = NULL;
2441 cmd->result = DID_ERROR << 16;
2442 collect_stats(hostdata, cmd);
2443 cmd->scsi_done(cmd);
2444 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2445 return;
2446 }
2447 msgout = NOP;
2448 break;
2449 case PHASE_CMDOUT:
2450 len = cmd->cmd_len;
2451 data = cmd->cmnd;
2452 /*
2453 * XXX for performance reasons, on machines with a
2454 * PSEUDO-DMA architecture we should probably
2455 * use the dma transfer function.
2456 */
2457 NCR5380_transfer_pio(instance, &phase, &len, &data);
2458 if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) {
2459 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
2460 dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
2461 return;
2462 }
2463 break;
2464 case PHASE_STATIN:
2465 len = 1;
2466 data = &tmp;
2467 NCR5380_transfer_pio(instance, &phase, &len, &data);
2468 cmd->SCp.Status = tmp;
2469 break;
2470 default:
2471 printk("scsi%d : unknown phase\n", instance->host_no);
2472 NCR5380_dprint(NDEBUG_ALL, instance);
2473 } /* switch(phase) */
2474 } /* if (tmp * SR_REQ) */
2475 else {
2476 /* RvC: go to sleep if polling time expired
2477 */
2478 if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) {
2479 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
2480 dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
2481 return;
2482 }
2483 }
2484 } /* while (1) */
2485}
2486
2487/*
2488 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2489 *
2490 * Purpose : does reselection, initializing the instance->connected
2491 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2492 * nexus has been reestablished,
2493 *
2494 * Inputs : instance - this instance of the NCR5380.
2495 *
2496 * Locks: io_request_lock held by caller if IRQ driven
2497 */
2498
2499static void NCR5380_reselect(struct Scsi_Host *instance) {
2500 NCR5380_local_declare();
2501 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
2502 instance->hostdata;
2503 unsigned char target_mask;
2504 unsigned char lun, phase;
2505 int len;
2506 unsigned char msg[3];
2507 unsigned char *data;
2508 Scsi_Cmnd *tmp = NULL, *prev;
2509 int abort = 0;
2510 NCR5380_setup(instance);
2511
2512 /*
2513 * Disable arbitration, etc. since the host adapter obviously
2514 * lost, and tell an interrupted NCR5380_select() to restart.
2515 */
2516
2517 NCR5380_write(MODE_REG, MR_BASE);
2518 hostdata->restart_select = 1;
2519
2520 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2521 dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no));
2522
2523 /*
2524 * At this point, we have detected that our SCSI ID is on the bus,
2525 * SEL is true and BSY was false for at least one bus settle delay
2526 * (400 ns).
2527 *
2528 * We must assert BSY ourselves, until the target drops the SEL
2529 * signal.
2530 */
2531
2532 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2533
2534 /* FIXME: timeout too long, must fail to workqueue */
2535 if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0)
2536 abort = 1;
2537
2538 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2539
2540 /*
2541 * Wait for target to go into MSGIN.
2542 * FIXME: timeout needed and fail to work queeu
2543 */
2544
2545 if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ))
2546 abort = 1;
2547
2548 len = 1;
2549 data = msg;
2550 phase = PHASE_MSGIN;
2551 NCR5380_transfer_pio(instance, &phase, &len, &data);
2552
2553 if (!(msg[0] & 0x80)) {
2554 printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no);
2555 print_msg(msg);
2556 abort = 1;
2557 } else {
2558 /* Accept message by clearing ACK */
2559 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2560 lun = (msg[0] & 0x07);
2561
2562 /*
2563 * We need to add code for SCSI-II to track which devices have
2564 * I_T_L_Q nexuses established, and which have simple I_T_L
2565 * nexuses so we can chose to do additional data transfer.
2566 */
2567
2568 /*
2569 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2570 * just reestablished, and remove it from the disconnected queue.
2571 */
2572
2573
2574 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
2575 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2576 ) {
2577 if (prev) {
2578 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
2579 prev->host_scribble = tmp->host_scribble;
2580 } else {
2581 REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble);
2582 hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble;
2583 }
2584 tmp->host_scribble = NULL;
2585 break;
2586 }
2587 if (!tmp) {
2588 printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun);
2589 /*
2590 * Since we have an established nexus that we can't do anything with,
2591 * we must abort it.
2592 */
2593 abort = 1;
2594 }
2595 }
2596
2597 if (abort) {
2598 do_abort(instance);
2599 } else {
2600 hostdata->connected = tmp;
2601 dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag));
2602 }
2603}
2604
2605/*
2606 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
2607 *
2608 * Purpose : called by interrupt handler when DMA finishes or a phase
2609 * mismatch occurs (which would finish the DMA transfer).
2610 *
2611 * Inputs : instance - this instance of the NCR5380.
2612 *
2613 * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L
2614 * nexus has been reestablished, on failure NULL is returned.
2615 */
2616
2617#ifdef REAL_DMA
2618static void NCR5380_dma_complete(NCR5380_instance * instance) {
2619 NCR5380_local_declare();
2620 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata * instance->hostdata);
2621 int transferred;
2622 NCR5380_setup(instance);
2623
2624 /*
2625 * XXX this might not be right.
2626 *
2627 * Wait for final byte to transfer, ie wait for ACK to go false.
2628 *
2629 * We should use the Last Byte Sent bit, unfortunately this is
2630 * not available on the 5380/5381 (only the various CMOS chips)
2631 *
2632 * FIXME: timeout, and need to handle long timeout/irq case
2633 */
2634
2635 NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ);
2636
2637 NCR5380_write(MODE_REG, MR_BASE);
2638 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2639
2640 /*
2641 * The only places we should see a phase mismatch and have to send
2642 * data from the same set of pointers will be the data transfer
2643 * phases. So, residual, requested length are only important here.
2644 */
2645
2646 if (!(hostdata->connected->SCp.phase & SR_CD)) {
2647 transferred = instance->dmalen - NCR5380_dma_residual();
2648 hostdata->connected->SCp.this_residual -= transferred;
2649 hostdata->connected->SCp.ptr += transferred;
2650 }
2651}
2652#endif /* def REAL_DMA */
2653
2654/*
2655 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2656 *
2657 * Purpose : abort a command
2658 *
2659 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2660 * host byte of the result field to, if zero DID_ABORTED is
2661 * used.
2662 *
2663 * Returns : 0 - success, -1 on failure.
2664 *
2665 * XXX - there is no way to abort the command that is currently
2666 * connected, you have to wait for it to complete. If this is
2667 * a problem, we could implement longjmp() / setjmp(), setjmp()
2668 * called where the loop started in NCR5380_main().
2669 *
2670 * Locks: host lock taken by caller
2671 */
2672
2673static int NCR5380_abort(Scsi_Cmnd * cmd) {
2674 NCR5380_local_declare();
2675 struct Scsi_Host *instance = cmd->device->host;
2676 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
2677 Scsi_Cmnd *tmp, **prev;
2678
2679 printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no);
2680 print_Scsi_Cmnd(cmd);
2681
2682 NCR5380_print_status(instance);
2683
2684 NCR5380_setup(instance);
2685
2686 dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no));
2687 dprintk(NDEBUG_ABORT, (" basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG)));
2688
2689#if 0
2690/*
2691 * Case 1 : If the command is the currently executing command,
2692 * we'll set the aborted flag and return control so that
2693 * information transfer routine can exit cleanly.
2694 */
2695
2696 if (hostdata->connected == cmd) {
2697 dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no));
2698 hostdata->aborted = 1;
2699/*
2700 * We should perform BSY checking, and make sure we haven't slipped
2701 * into BUS FREE.
2702 */
2703
2704 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN);
2705/*
2706 * Since we can't change phases until we've completed the current
2707 * handshake, we have to source or sink a byte of data if the current
2708 * phase is not MSGOUT.
2709 */
2710
2711/*
2712 * Return control to the executing NCR drive so we can clear the
2713 * aborted flag and get back into our main loop.
2714 */
2715
2716 return 0;
2717 }
2718#endif
2719
2720/*
2721 * Case 2 : If the command hasn't been issued yet, we simply remove it
2722 * from the issue queue.
2723 */
2724
2725 dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no));
2726 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)
2727 if (cmd == tmp) {
2728 REMOVE(5, *prev, tmp, tmp->host_scribble);
2729 (*prev) = (Scsi_Cmnd *) tmp->host_scribble;
2730 tmp->host_scribble = NULL;
2731 tmp->result = DID_ABORT << 16;
2732 dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no));
2733 tmp->done(tmp);
2734 return SUCCESS;
2735 }
2736#if (NDEBUG & NDEBUG_ABORT)
2737 /* KLL */
2738 else if (prev == tmp)
2739 printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no);
2740#endif
2741
2742/*
2743 * Case 3 : If any commands are connected, we're going to fail the abort
2744 * and let the high level SCSI driver retry at a later time or
2745 * issue a reset.
2746 *
2747 * Timeouts, and therefore aborted commands, will be highly unlikely
2748 * and handling them cleanly in this situation would make the common
2749 * case of noresets less efficient, and would pollute our code. So,
2750 * we fail.
2751 */
2752
2753 if (hostdata->connected) {
2754 dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no));
2755 return FAILED;
2756 }
2757/*
2758 * Case 4: If the command is currently disconnected from the bus, and
2759 * there are no connected commands, we reconnect the I_T_L or
2760 * I_T_L_Q nexus associated with it, go into message out, and send
2761 * an abort message.
2762 *
2763 * This case is especially ugly. In order to reestablish the nexus, we
2764 * need to call NCR5380_select(). The easiest way to implement this
2765 * function was to abort if the bus was busy, and let the interrupt
2766 * handler triggered on the SEL for reselect take care of lost arbitrations
2767 * where necessary, meaning interrupts need to be enabled.
2768 *
2769 * When interrupts are enabled, the queues may change - so we
2770 * can't remove it from the disconnected queue before selecting it
2771 * because that could cause a failure in hashing the nexus if that
2772 * device reselected.
2773 *
2774 * Since the queues may change, we can't use the pointers from when we
2775 * first locate it.
2776 *
2777 * So, we must first locate the command, and if NCR5380_select()
2778 * succeeds, then issue the abort, relocate the command and remove
2779 * it from the disconnected queue.
2780 */
2781
2782 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble)
2783 if (cmd == tmp) {
2784 dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no));
2785
2786 if (NCR5380_select(instance, cmd, (int) cmd->tag))
2787 return FAILED;
2788 dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no));
2789
2790 do_abort(instance);
2791
2792 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)
2793 if (cmd == tmp) {
2794 REMOVE(5, *prev, tmp, tmp->host_scribble);
2795 *prev = (Scsi_Cmnd *) tmp->host_scribble;
2796 tmp->host_scribble = NULL;
2797 tmp->result = DID_ABORT << 16;
2798 tmp->done(tmp);
2799 return SUCCESS;
2800 }
2801 }
2802/*
2803 * Case 5 : If we reached this point, the command was not found in any of
2804 * the queues.
2805 *
2806 * We probably reached this point because of an unlikely race condition
2807 * between the command completing successfully and the abortion code,
2808 * so we won't panic, but we will notify the user in case something really
2809 * broke.
2810 */
2811 printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n"
2812 " before abortion\n", instance->host_no);
2813 return FAILED;
2814}
2815
2816
2817/*
2818 * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd)
2819 *
2820 * Purpose : reset the SCSI bus.
2821 *
2822 * Returns : SUCCESS
2823 *
2824 * Locks: host lock taken by caller
2825 */
2826
2827static int NCR5380_bus_reset(Scsi_Cmnd * cmd) {
2828 NCR5380_local_declare();
2829 NCR5380_setup(cmd->device->host);
2830
2831 NCR5380_print_status(cmd->device->host);
2832 do_reset(cmd->device->host);
2833 return SUCCESS;
2834}
2835
2836/*
2837 * Function : int NCR5380_device_reset (Scsi_Cmnd *cmd)
2838 *
2839 * Purpose : reset a SCSI device
2840 *
2841 * Returns : FAILED
2842 *
2843 * Locks: io_request_lock held by caller
2844 */
2845
2846static int NCR5380_device_reset(Scsi_Cmnd * cmd) {
2847 return FAILED;
2848}
2849
2850/*
2851 * Function : int NCR5380_host_reset (Scsi_Cmnd *cmd)
2852 *
2853 * Purpose : reset a SCSI device
2854 *
2855 * Returns : FAILED
2856 *
2857 * Locks: io_request_lock held by caller
2858 */
2859
2860static int NCR5380_host_reset(Scsi_Cmnd * cmd) {
2861 return FAILED;
2862}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-30 00:39:46 -0500