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NCR5380.c
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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)
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
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
40  * (hopefully) fixed and enhanced USLEEP
41  * added support for DTC3181E card (for Mustek scanner)
42  *
43 
44  * Revision 1.8 Ingmar Baumgart
46  * added support for NCR53C400a card
47  *
48 
49  * Revision 1.7 1996/3/2 Ray Van Tassle ([email protected])
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 #include <scsi/scsi_dbg.h>
91 
92 #ifndef NDEBUG
93 #define NDEBUG 0
94 #endif
95 #ifndef NDEBUG_ABORT
96 #define NDEBUG_ABORT 0
97 #endif
98 
99 #if (NDEBUG & NDEBUG_LISTS)
100 #define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); }
101 #define REMOVE(w,x,y,z) {printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, (void*)(w), (void*)(x), (void*)(y), (void*)(z)); if ((x)==(y)) udelay(5); }
102 #else
103 #define LIST(x,y)
104 #define REMOVE(w,x,y,z)
105 #endif
106 
107 #ifndef notyet
108 #undef LINKED
109 #undef REAL_DMA
110 #endif
111 
112 #ifdef REAL_DMA_POLL
113 #undef READ_OVERRUNS
114 #define READ_OVERRUNS
115 #endif
116 
117 #ifdef BOARD_REQUIRES_NO_DELAY
118 #define io_recovery_delay(x)
119 #else
120 #define io_recovery_delay(x) udelay(x)
121 #endif
122 
123 /*
124  * Design
125  *
126  * This is a generic 5380 driver. To use it on a different platform,
127  * one simply writes appropriate system specific macros (ie, data
128  * transfer - some PC's will use the I/O bus, 68K's must use
129  * memory mapped) and drops this file in their 'C' wrapper.
130  *
131  * (Note from hch: unfortunately it was not enough for the different
132  * m68k folks and instead of improving this driver they copied it
133  * and hacked it up for their needs. As a consequence they lost
134  * most updates to this driver. Maybe someone will fix all these
135  * drivers to use a common core one day..)
136  *
137  * As far as command queueing, two queues are maintained for
138  * each 5380 in the system - commands that haven't been issued yet,
139  * and commands that are currently executing. This means that an
140  * unlimited number of commands may be queued, letting
141  * more commands propagate from the higher driver levels giving higher
142  * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
143  * allowing multiple commands to propagate all the way to a SCSI-II device
144  * while a command is already executing.
145  *
146  *
147  * Issues specific to the NCR5380 :
148  *
149  * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
150  * piece of hardware that requires you to sit in a loop polling for
151  * the REQ signal as long as you are connected. Some devices are
152  * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
153  * while doing long seek operations.
154  *
155  * The workaround for this is to keep track of devices that have
156  * disconnected. If the device hasn't disconnected, for commands that
157  * should disconnect, we do something like
158  *
159  * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
160  *
161  * Some tweaking of N and M needs to be done. An algorithm based
162  * on "time to data" would give the best results as long as short time
163  * to datas (ie, on the same track) were considered, however these
164  * broken devices are the exception rather than the rule and I'd rather
165  * spend my time optimizing for the normal case.
166  *
167  * Architecture :
168  *
169  * At the heart of the design is a coroutine, NCR5380_main,
170  * which is started from a workqueue for each NCR5380 host in the
171  * system. It attempts to establish I_T_L or I_T_L_Q nexuses by
172  * removing the commands from the issue queue and calling
173  * NCR5380_select() if a nexus is not established.
174  *
175  * Once a nexus is established, the NCR5380_information_transfer()
176  * phase goes through the various phases as instructed by the target.
177  * if the target goes into MSG IN and sends a DISCONNECT message,
178  * the command structure is placed into the per instance disconnected
179  * queue, and NCR5380_main tries to find more work. If the target is
180  * idle for too long, the system will try to sleep.
181  *
182  * If a command has disconnected, eventually an interrupt will trigger,
183  * calling NCR5380_intr() which will in turn call NCR5380_reselect
184  * to reestablish a nexus. This will run main if necessary.
185  *
186  * On command termination, the done function will be called as
187  * appropriate.
188  *
189  * SCSI pointers are maintained in the SCp field of SCSI command
190  * structures, being initialized after the command is connected
191  * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
192  * Note that in violation of the standard, an implicit SAVE POINTERS operation
193  * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
194  */
195 
196 /*
197  * Using this file :
198  * This file a skeleton Linux SCSI driver for the NCR 5380 series
199  * of chips. To use it, you write an architecture specific functions
200  * and macros and include this file in your driver.
201  *
202  * These macros control options :
203  * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be
204  * defined.
205  *
206  * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
207  * for commands that return with a CHECK CONDITION status.
208  *
209  * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
210  * transceivers.
211  *
212  * DONT_USE_INTR - if defined, never use interrupts, even if we probe or
213  * override-configure an IRQ.
214  *
215  * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512
216  * bytes at a time. Since interrupts are disabled by default during
217  * these transfers, we might need this to give reasonable interrupt
218  * service time if the transfer size gets too large.
219  *
220  * LINKED - if defined, linked commands are supported.
221  *
222  * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases.
223  *
224  * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
225  *
226  * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't
227  * rely on phase mismatch and EOP interrupts to determine end
228  * of phase.
229  *
230  * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You
231  * only really want to use this if you're having a problem with
232  * dropped characters during high speed communications, and even
233  * then, you're going to be better off twiddling with transfersize
234  * in the high level code.
235  *
236  * Defaults for these will be provided although the user may want to adjust
237  * these to allocate CPU resources to the SCSI driver or "real" code.
238  *
239  * USLEEP_SLEEP - amount of time, in jiffies, to sleep
240  *
241  * USLEEP_POLL - amount of time, in jiffies, to poll
242  *
243  * These macros MUST be defined :
244  * NCR5380_local_declare() - declare any local variables needed for your
245  * transfer routines.
246  *
247  * NCR5380_setup(instance) - initialize any local variables needed from a given
248  * instance of the host adapter for NCR5380_{read,write,pread,pwrite}
249  *
250  * NCR5380_read(register) - read from the specified register
251  *
252  * NCR5380_write(register, value) - write to the specific register
253  *
254  * NCR5380_implementation_fields - additional fields needed for this
255  * specific implementation of the NCR5380
256  *
257  * Either real DMA *or* pseudo DMA may be implemented
258  * REAL functions :
259  * NCR5380_REAL_DMA should be defined if real DMA is to be used.
260  * Note that the DMA setup functions should return the number of bytes
261  * that they were able to program the controller for.
262  *
263  * Also note that generic i386/PC versions of these macros are
264  * available as NCR5380_i386_dma_write_setup,
265  * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
266  *
267  * NCR5380_dma_write_setup(instance, src, count) - initialize
268  * NCR5380_dma_read_setup(instance, dst, count) - initialize
269  * NCR5380_dma_residual(instance); - residual count
270  *
271  * PSEUDO functions :
272  * NCR5380_pwrite(instance, src, count)
273  * NCR5380_pread(instance, dst, count);
274  *
275  * The generic driver is initialized by calling NCR5380_init(instance),
276  * after setting the appropriate host specific fields and ID. If the
277  * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
278  * possible) function may be used.
279  */
280 
281 static int do_abort(struct Scsi_Host *host);
282 static void do_reset(struct Scsi_Host *host);
283 
284 /*
285  * initialize_SCp - init the scsi pointer field
286  * @cmd: command block to set up
287  *
288  * Set up the internal fields in the SCSI command.
289  */
290 
291 static __inline__ void initialize_SCp(Scsi_Cmnd * cmd)
292 {
293  /*
294  * Initialize the Scsi Pointer field so that all of the commands in the
295  * various queues are valid.
296  */
297 
298  if (scsi_bufflen(cmd)) {
299  cmd->SCp.buffer = scsi_sglist(cmd);
300  cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
301  cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
302  cmd->SCp.this_residual = cmd->SCp.buffer->length;
303  } else {
304  cmd->SCp.buffer = NULL;
305  cmd->SCp.buffers_residual = 0;
306  cmd->SCp.ptr = NULL;
307  cmd->SCp.this_residual = 0;
308  }
309 }
310 
325 static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t)
326 {
328  int n = 500; /* At about 8uS a cycle for the cpu access */
329  unsigned long end = jiffies + t;
330  int r;
331 
332  NCR5380_setup(instance);
333 
334  while( n-- > 0)
335  {
336  r = NCR5380_read(reg);
337  if((r & bit) == val)
338  return 0;
339  cpu_relax();
340  }
341 
342  /* t time yet ? */
343  while(time_before(jiffies, end))
344  {
345  r = NCR5380_read(reg);
346  if((r & bit) == val)
347  return 0;
348  if(!in_interrupt())
349  cond_resched();
350  else
351  cpu_relax();
352  }
353  return -ETIMEDOUT;
354 }
355 
356 static struct {
357  unsigned char value;
358  const char *name;
359 } phases[] __maybe_unused = {
360  {PHASE_DATAOUT, "DATAOUT"},
361  {PHASE_DATAIN, "DATAIN"},
362  {PHASE_CMDOUT, "CMDOUT"},
363  {PHASE_STATIN, "STATIN"},
364  {PHASE_MSGOUT, "MSGOUT"},
365  {PHASE_MSGIN, "MSGIN"},
366  {PHASE_UNKNOWN, "UNKNOWN"}
367 };
368 
369 #if NDEBUG
370 static struct {
371  unsigned char mask;
372  const char *name;
373 } signals[] = {
374  {SR_DBP, "PARITY"},
375  {SR_RST, "RST"},
376  {SR_BSY, "BSY"},
377  {SR_REQ, "REQ"},
378  {SR_MSG, "MSG"},
379  {SR_CD, "CD"},
380  {SR_IO, "IO"},
381  {SR_SEL, "SEL"},
382  {0, NULL}
383 },
384 basrs[] = {
385  {BASR_ATN, "ATN"},
386  {BASR_ACK, "ACK"},
387  {0, NULL}
388 },
389 icrs[] = {
390  {ICR_ASSERT_RST, "ASSERT RST"},
391  {ICR_ASSERT_ACK, "ASSERT ACK"},
392  {ICR_ASSERT_BSY, "ASSERT BSY"},
393  {ICR_ASSERT_SEL, "ASSERT SEL"},
394  {ICR_ASSERT_ATN, "ASSERT ATN"},
395  {ICR_ASSERT_DATA, "ASSERT DATA"},
396  {0, NULL}
397 },
398 mrs[] = {
399  {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"},
400  {MR_TARGET, "MODE TARGET"},
401  {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"},
402  {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"},
403  {MR_MONITOR_BSY, "MODE MONITOR BSY"},
404  {MR_DMA_MODE, "MODE DMA"},
405  {MR_ARBITRATE, "MODE ARBITRATION"},
406  {0, NULL}
407 };
408 
418 static void NCR5380_print(struct Scsi_Host *instance)
419 {
421  unsigned char status, data, basr, mr, icr, i;
422  NCR5380_setup(instance);
423 
425  status = NCR5380_read(STATUS_REG);
426  mr = NCR5380_read(MODE_REG);
429 
430  printk("STATUS_REG: %02x ", status);
431  for (i = 0; signals[i].mask; ++i)
432  if (status & signals[i].mask)
433  printk(",%s", signals[i].name);
434  printk("\nBASR: %02x ", basr);
435  for (i = 0; basrs[i].mask; ++i)
436  if (basr & basrs[i].mask)
437  printk(",%s", basrs[i].name);
438  printk("\nICR: %02x ", icr);
439  for (i = 0; icrs[i].mask; ++i)
440  if (icr & icrs[i].mask)
441  printk(",%s", icrs[i].name);
442  printk("\nMODE: %02x ", mr);
443  for (i = 0; mrs[i].mask; ++i)
444  if (mr & mrs[i].mask)
445  printk(",%s", mrs[i].name);
446  printk("\n");
447 }
448 
449 
450 /*
451  * NCR5380_print_phase - show SCSI phase
452  * @instance: adapter to dump
453  *
454  * Print the current SCSI phase for debugging purposes
455  *
456  * Locks: none
457  */
458 
459 static void NCR5380_print_phase(struct Scsi_Host *instance)
460 {
462  unsigned char status;
463  int i;
464  NCR5380_setup(instance);
465 
466  status = NCR5380_read(STATUS_REG);
467  if (!(status & SR_REQ))
468  printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no);
469  else {
470  for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i);
471  printk("scsi%d : phase %s\n", instance->host_no, phases[i].name);
472  }
473 }
474 #endif
475 
476 /*
477  * These need tweaking, and would probably work best as per-device
478  * flags initialized differently for disk, tape, cd, etc devices.
479  * People with broken devices are free to experiment as to what gives
480  * the best results for them.
481  *
482  * USLEEP_SLEEP should be a minimum seek time.
483  *
484  * USLEEP_POLL should be a maximum rotational latency.
485  */
486 #ifndef USLEEP_SLEEP
487 /* 20 ms (reasonable hard disk speed) */
488 #define USLEEP_SLEEP (20*HZ/1000)
489 #endif
490 /* 300 RPM (floppy speed) */
491 #ifndef USLEEP_POLL
492 #define USLEEP_POLL (200*HZ/1000)
493 #endif
494 #ifndef USLEEP_WAITLONG
495 /* RvC: (reasonable time to wait on select error) */
496 #define USLEEP_WAITLONG USLEEP_SLEEP
497 #endif
498 
499 /*
500  * Function : int should_disconnect (unsigned char cmd)
501  *
502  * Purpose : decide whether a command would normally disconnect or
503  * not, since if it won't disconnect we should go to sleep.
504  *
505  * Input : cmd - opcode of SCSI command
506  *
507  * Returns : DISCONNECT_LONG if we should disconnect for a really long
508  * time (ie always, sleep, look for REQ active, sleep),
509  * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal
510  * time-to-data delay, DISCONNECT_NONE if this command would return
511  * immediately.
512  *
513  * Future sleep algorithms based on time to data can exploit
514  * something like this so they can differentiate between "normal"
515  * (ie, read, write, seek) and unusual commands (ie, * format).
516  *
517  * Note : We don't deal with commands that handle an immediate disconnect,
518  *
519  */
520 
521 static int should_disconnect(unsigned char cmd)
522 {
523  switch (cmd) {
524  case READ_6:
525  case WRITE_6:
526  case SEEK_6:
527  case READ_10:
528  case WRITE_10:
529  case SEEK_10:
531  case FORMAT_UNIT:
532  case SEARCH_HIGH:
533  case SEARCH_LOW:
534  case SEARCH_EQUAL:
535  return DISCONNECT_LONG;
536  default:
537  return DISCONNECT_NONE;
538  }
539 }
540 
541 static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout)
542 {
543  hostdata->time_expires = jiffies + timeout;
544  schedule_delayed_work(&hostdata->coroutine, timeout);
545 }
546 
547 
548 static int probe_irq __initdata = 0;
549 
560 static irqreturn_t __init probe_intr(int irq, void *dev_id)
561 {
562  probe_irq = irq;
563  return IRQ_HANDLED;
564 }
565 
577 static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance,
578  int possible)
579 {
581  struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
582  unsigned long timeout;
583  int trying_irqs, i, mask;
584  NCR5380_setup(instance);
585 
586  for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1)
587  if ((mask & possible) && (request_irq(i, &probe_intr, IRQF_DISABLED, "NCR-probe", NULL) == 0))
588  trying_irqs |= mask;
589 
590  timeout = jiffies + (250 * HZ / 1000);
591  probe_irq = SCSI_IRQ_NONE;
592 
593  /*
594  * A interrupt is triggered whenever BSY = false, SEL = true
595  * and a bit set in the SELECT_ENABLE_REG is asserted on the
596  * SCSI bus.
597  *
598  * Note that the bus is only driven when the phase control signals
599  * (I/O, C/D, and MSG) match those in the TCR, so we must reset that
600  * to zero.
601  */
602 
607 
608  while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout))
610 
613 
614  for (i = 0, mask = 1; i < 16; ++i, mask <<= 1)
615  if (trying_irqs & mask)
616  free_irq(i, NULL);
617 
618  return probe_irq;
619 }
620 
632 static void __init __maybe_unused
633 NCR5380_print_options(struct Scsi_Host *instance)
634 {
635  printk(" generic options"
636 #ifdef AUTOPROBE_IRQ
637  " AUTOPROBE_IRQ"
638 #endif
639 #ifdef AUTOSENSE
640  " AUTOSENSE"
641 #endif
642 #ifdef DIFFERENTIAL
643  " DIFFERENTIAL"
644 #endif
645 #ifdef REAL_DMA
646  " REAL DMA"
647 #endif
648 #ifdef REAL_DMA_POLL
649  " REAL DMA POLL"
650 #endif
651 #ifdef PARITY
652  " PARITY"
653 #endif
654 #ifdef PSEUDO_DMA
655  " PSEUDO DMA"
656 #endif
657 #ifdef UNSAFE
658  " UNSAFE "
659 #endif
660  );
661  printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP);
662  printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
663  if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) {
664  printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE);
665  }
666 }
667 
678 static void NCR5380_print_status(struct Scsi_Host *instance)
679 {
680  NCR5380_dprint(NDEBUG_ANY, instance);
681  NCR5380_dprint_phase(NDEBUG_ANY, instance);
682 }
683 
684 /******************************************/
685 /*
686  * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
687  *
688  * *buffer: I/O buffer
689  * **start: if inout == FALSE pointer into buffer where user read should start
690  * offset: current offset
691  * length: length of buffer
692  * hostno: Scsi_Host host_no
693  * inout: TRUE - user is writing; FALSE - user is reading
694  *
695  * Return the number of bytes read from or written
696  */
697 
698 #undef SPRINTF
699 #define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0)
700 static
701 char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length);
702 static
703 char *lprint_command(unsigned char *cmd, char *pos, char *buffer, int len);
704 static
705 char *lprint_opcode(int opcode, char *pos, char *buffer, int length);
706 
707 static int __maybe_unused NCR5380_proc_info(struct Scsi_Host *instance,
708  char *buffer, char **start, off_t offset, int length, int inout)
709 {
710  char *pos = buffer;
711  struct NCR5380_hostdata *hostdata;
712  Scsi_Cmnd *ptr;
713 
714  hostdata = (struct NCR5380_hostdata *) instance->hostdata;
715 
716  if (inout) { /* Has data been written to the file ? */
717 #ifdef DTC_PUBLIC_RELEASE
718  dtc_wmaxi = dtc_maxi = 0;
719 #endif
720 #ifdef PAS16_PUBLIC_RELEASE
721  pas_wmaxi = pas_maxi = 0;
722 #endif
723  return (-ENOSYS); /* Currently this is a no-op */
724  }
725  SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE);
726  if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400)
727  SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE);
728 #ifdef DTC_PUBLIC_RELEASE
729  SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE);
730 #endif
731 #ifdef T128_PUBLIC_RELEASE
732  SPRINTF("T128 release %d", T128_PUBLIC_RELEASE);
733 #endif
734 #ifdef GENERIC_NCR5380_PUBLIC_RELEASE
735  SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE);
736 #endif
737 #ifdef PAS16_PUBLIC_RELEASE
738  SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE);
739 #endif
740 
741  SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base);
742  SPRINTF("io_port: %04x ", (int) instance->io_port);
743  if (instance->irq == SCSI_IRQ_NONE)
744  SPRINTF("IRQ: None.\n");
745  else
746  SPRINTF("IRQ: %d.\n", instance->irq);
747 
748 #ifdef DTC_PUBLIC_RELEASE
749  SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi);
750 #endif
751 #ifdef PAS16_PUBLIC_RELEASE
752  SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi);
753 #endif
754  spin_lock_irq(instance->host_lock);
755  if (!hostdata->connected)
756  SPRINTF("scsi%d: no currently connected command\n", instance->host_no);
757  else
758  pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, pos, buffer, length);
759  SPRINTF("scsi%d: issue_queue\n", instance->host_no);
760  for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
761  pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
762 
763  SPRINTF("scsi%d: disconnected_queue\n", instance->host_no);
764  for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
765  pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
766  spin_unlock_irq(instance->host_lock);
767 
768  *start = buffer;
769  if (pos - buffer < offset)
770  return 0;
771  else if (pos - buffer - offset < length)
772  return pos - buffer - offset;
773  return length;
774 }
775 
776 static char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length)
777 {
778  SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun);
779  SPRINTF(" command = ");
780  pos = lprint_command(cmd->cmnd, pos, buffer, length);
781  return (pos);
782 }
783 
784 static char *lprint_command(unsigned char *command, char *pos, char *buffer, int length)
785 {
786  int i, s;
787  pos = lprint_opcode(command[0], pos, buffer, length);
788  for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
789  SPRINTF("%02x ", command[i]);
790  SPRINTF("\n");
791  return (pos);
792 }
793 
794 static char *lprint_opcode(int opcode, char *pos, char *buffer, int length)
795 {
796  SPRINTF("%2d (0x%02x)", opcode, opcode);
797  return (pos);
798 }
799 
800 
817 static int __devinit NCR5380_init(struct Scsi_Host *instance, int flags)
818 {
820  int i, pass;
821  unsigned long timeout;
822  struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
823 
824  if(in_interrupt())
825  printk(KERN_ERR "NCR5380_init called with interrupts off!\n");
826  /*
827  * On NCR53C400 boards, NCR5380 registers are mapped 8 past
828  * the base address.
829  */
830 
831 #ifdef NCR53C400
832  if (flags & FLAG_NCR53C400)
833  instance->NCR5380_instance_name += NCR53C400_address_adjust;
834 #endif
835 
836  NCR5380_setup(instance);
837 
838  hostdata->aborted = 0;
839  hostdata->id_mask = 1 << instance->this_id;
840  for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
841  if (i > hostdata->id_mask)
842  hostdata->id_higher_mask |= i;
843  for (i = 0; i < 8; ++i)
844  hostdata->busy[i] = 0;
845 #ifdef REAL_DMA
846  hostdata->dmalen = 0;
847 #endif
848  hostdata->targets_present = 0;
849  hostdata->connected = NULL;
850  hostdata->issue_queue = NULL;
851  hostdata->disconnected_queue = NULL;
852 
853  INIT_DELAYED_WORK(&hostdata->coroutine, NCR5380_main);
854 
855 #ifdef NCR5380_STATS
856  for (i = 0; i < 8; ++i) {
857  hostdata->time_read[i] = 0;
858  hostdata->time_write[i] = 0;
859  hostdata->bytes_read[i] = 0;
860  hostdata->bytes_write[i] = 0;
861  }
862  hostdata->timebase = 0;
863  hostdata->pendingw = 0;
864  hostdata->pendingr = 0;
865 #endif
866 
867  /* The CHECK code seems to break the 53C400. Will check it later maybe */
868  if (flags & FLAG_NCR53C400)
869  hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags;
870  else
871  hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags;
872 
873  hostdata->host = instance;
874  hostdata->time_expires = 0;
875 
876 #ifndef AUTOSENSE
877  if ((instance->cmd_per_lun > 1) || instance->can_queue > 1)
878  printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n"
879  " be incorrectly cleared.\n", instance->host_no);
880 #endif /* def AUTOSENSE */
881 
886 
887 #ifdef NCR53C400
888  if (hostdata->flags & FLAG_NCR53C400) {
890  }
891 #endif
892 
893  /*
894  * Detect and correct bus wedge problems.
895  *
896  * If the system crashed, it may have crashed in a state
897  * where a SCSI command was still executing, and the
898  * SCSI bus is not in a BUS FREE STATE.
899  *
900  * If this is the case, we'll try to abort the currently
901  * established nexus which we know nothing about, and that
902  * failing, do a hard reset of the SCSI bus
903  */
904 
905  for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) {
906  switch (pass) {
907  case 1:
908  case 3:
909  case 5:
910  printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no);
911  timeout = jiffies + 5 * HZ;
912  NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ);
913  break;
914  case 2:
915  printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no);
916  do_abort(instance);
917  break;
918  case 4:
919  printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no);
920  do_reset(instance);
921  break;
922  case 6:
923  printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no);
924  return -ENXIO;
925  }
926  }
927  return 0;
928 }
929 
935 static void NCR5380_exit(struct Scsi_Host *instance)
936 {
937  struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
938 
940 }
941 
954 static int NCR5380_queue_command_lck(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
955 {
956  struct Scsi_Host *instance = cmd->device->host;
957  struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
958  Scsi_Cmnd *tmp;
959 
961  switch (cmd->cmnd[0]) {
962  case WRITE_6:
963  case WRITE_10:
964  printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no);
965  cmd->result = (DID_ERROR << 16);
966  done(cmd);
967  return 0;
968  }
969 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
970 
971 #ifdef NCR5380_STATS
972  switch (cmd->cmnd[0]) {
973  case WRITE:
974  case WRITE_6:
975  case WRITE_10:
976  hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
977  hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);
978  hostdata->pendingw++;
979  break;
980  case READ:
981  case READ_6:
982  case READ_10:
983  hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
984  hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);
985  hostdata->pendingr++;
986  break;
987  }
988 #endif
989 
990  /*
991  * We use the host_scribble field as a pointer to the next command
992  * in a queue
993  */
994 
995  cmd->host_scribble = NULL;
996  cmd->scsi_done = done;
997  cmd->result = 0;
998 
999  /*
1000  * Insert the cmd into the issue queue. Note that REQUEST SENSE
1001  * commands are added to the head of the queue since any command will
1002  * clear the contingent allegiance condition that exists and the
1003  * sense data is only guaranteed to be valid while the condition exists.
1004  */
1005 
1006  if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
1007  LIST(cmd, hostdata->issue_queue);
1008  cmd->host_scribble = (unsigned char *) hostdata->issue_queue;
1009  hostdata->issue_queue = cmd;
1010  } else {
1011  for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble);
1012  LIST(cmd, tmp);
1013  tmp->host_scribble = (unsigned char *) cmd;
1014  }
1015  dprintk(NDEBUG_QUEUES, ("scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"));
1016 
1017  /* Run the coroutine if it isn't already running. */
1018  /* Kick off command processing */
1019  schedule_delayed_work(&hostdata->coroutine, 0);
1020  return 0;
1021 }
1022 
1024 
1025 
1037 static void NCR5380_main(struct work_struct *work)
1038 {
1039  struct NCR5380_hostdata *hostdata =
1040  container_of(work, struct NCR5380_hostdata, coroutine.work);
1041  struct Scsi_Host *instance = hostdata->host;
1042  Scsi_Cmnd *tmp, *prev;
1043  int done;
1044 
1045  spin_lock_irq(instance->host_lock);
1046  do {
1047  /* Lock held here */
1048  done = 1;
1049  if (!hostdata->connected && !hostdata->selecting) {
1050  dprintk(NDEBUG_MAIN, ("scsi%d : not connected\n", instance->host_no));
1051  /*
1052  * Search through the issue_queue for a command destined
1053  * for a target that's not busy.
1054  */
1055  for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
1056  {
1057  if (prev != tmp)
1058  dprintk(NDEBUG_LISTS, ("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun));
1059  /* When we find one, remove it from the issue queue. */
1060  if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) {
1061  if (prev) {
1062  REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
1063  prev->host_scribble = tmp->host_scribble;
1064  } else {
1065  REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble);
1066  hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble;
1067  }
1068  tmp->host_scribble = NULL;
1069 
1070  /*
1071  * Attempt to establish an I_T_L nexus here.
1072  * On success, instance->hostdata->connected is set.
1073  * On failure, we must add the command back to the
1074  * issue queue so we can keep trying.
1075  */
1076  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));
1077 
1078  /*
1079  * A successful selection is defined as one that
1080  * leaves us with the command connected and
1081  * in hostdata->connected, OR has terminated the
1082  * command.
1083  *
1084  * With successful commands, we fall through
1085  * and see if we can do an information transfer,
1086  * with failures we will restart.
1087  */
1088  hostdata->selecting = NULL;
1089  /* RvC: have to preset this to indicate a new command is being performed */
1090 
1091  if (!NCR5380_select(instance, tmp,
1092  /*
1093  * REQUEST SENSE commands are issued without tagged
1094  * queueing, even on SCSI-II devices because the
1095  * contingent allegiance condition exists for the
1096  * entire unit.
1097  */
1098  (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
1099  break;
1100  } else {
1101  LIST(tmp, hostdata->issue_queue);
1102  tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1103  hostdata->issue_queue = tmp;
1104  done = 0;
1105  dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no));
1106  }
1107  /* lock held here still */
1108  } /* if target/lun is not busy */
1109  } /* for */
1110  /* exited locked */
1111  } /* if (!hostdata->connected) */
1112  if (hostdata->selecting) {
1113  tmp = (Scsi_Cmnd *) hostdata->selecting;
1114  /* Selection will drop and retake the lock */
1115  if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
1116  /* Ok ?? */
1117  } else {
1118  /* RvC: device failed, so we wait a long time
1119  this is needed for Mustek scanners, that
1120  do not respond to commands immediately
1121  after a scan */
1122  printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id);
1123  LIST(tmp, hostdata->issue_queue);
1124  tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1125  hostdata->issue_queue = tmp;
1126  NCR5380_set_timer(hostdata, USLEEP_WAITLONG);
1127  }
1128  } /* if hostdata->selecting */
1129  if (hostdata->connected
1130 #ifdef REAL_DMA
1131  && !hostdata->dmalen
1132 #endif
1133  && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies))
1134  ) {
1135  dprintk(NDEBUG_MAIN, ("scsi%d : main() : performing information transfer\n", instance->host_no));
1136  NCR5380_information_transfer(instance);
1137  dprintk(NDEBUG_MAIN, ("scsi%d : main() : done set false\n", instance->host_no));
1138  done = 0;
1139  } else
1140  break;
1141  } while (!done);
1142 
1143  spin_unlock_irq(instance->host_lock);
1144 }
1145 
1146 #ifndef DONT_USE_INTR
1147 
1160 static irqreturn_t NCR5380_intr(int dummy, void *dev_id)
1161 {
1163  struct Scsi_Host *instance = dev_id;
1164  struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1165  int done;
1166  unsigned char basr;
1167  unsigned long flags;
1168 
1169  dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n",
1170  instance->irq));
1171 
1172  do {
1173  done = 1;
1174  spin_lock_irqsave(instance->host_lock, flags);
1175  /* Look for pending interrupts */
1176  NCR5380_setup(instance);
1178  /* XXX dispatch to appropriate routine if found and done=0 */
1179  if (basr & BASR_IRQ) {
1180  NCR5380_dprint(NDEBUG_INTR, instance);
1181  if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1182  done = 0;
1183  dprintk(NDEBUG_INTR, ("scsi%d : SEL interrupt\n", instance->host_no));
1184  NCR5380_reselect(instance);
1186  } else if (basr & BASR_PARITY_ERROR) {
1187  dprintk(NDEBUG_INTR, ("scsi%d : PARITY interrupt\n", instance->host_no));
1189  } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1190  dprintk(NDEBUG_INTR, ("scsi%d : RESET interrupt\n", instance->host_no));
1192  } else {
1193 #if defined(REAL_DMA)
1194  /*
1195  * We should only get PHASE MISMATCH and EOP interrupts
1196  * if we have DMA enabled, so do a sanity check based on
1197  * the current setting of the MODE register.
1198  */
1199 
1200  if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) {
1201  int transferred;
1202 
1203  if (!hostdata->connected)
1204  panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno);
1205 
1206  transferred = (hostdata->dmalen - NCR5380_dma_residual(instance));
1207  hostdata->connected->SCp.this_residual -= transferred;
1208  hostdata->connected->SCp.ptr += transferred;
1209  hostdata->dmalen = 0;
1210 
1212 
1213  /* FIXME: we need to poll briefly then defer a workqueue task ! */
1214  NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ);
1215 
1218  }
1219 #else
1220  dprintk(NDEBUG_INTR, ("scsi : unknown interrupt, BASR 0x%X, MR 0x%X, SR 0x%x\n", basr, NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG)));
1222 #endif
1223  }
1224  } /* if BASR_IRQ */
1225  spin_unlock_irqrestore(instance->host_lock, flags);
1226  if(!done)
1227  schedule_delayed_work(&hostdata->coroutine, 0);
1228  } while (!done);
1229  return IRQ_HANDLED;
1230 }
1231 
1232 #endif
1233 
1242 static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd)
1243 {
1244 #ifdef NCR5380_STATS
1245  switch (cmd->cmnd[0]) {
1246  case WRITE:
1247  case WRITE_6:
1248  case WRITE_10:
1249  hostdata->time_write[scmd_id(cmd)] += (jiffies - hostdata->timebase);
1250  hostdata->pendingw--;
1251  break;
1252  case READ:
1253  case READ_6:
1254  case READ_10:
1255  hostdata->time_read[scmd_id(cmd)] += (jiffies - hostdata->timebase);
1256  hostdata->pendingr--;
1257  break;
1258  }
1259 #endif
1260 }
1261 
1262 
1263 /*
1264  * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
1265  * int tag);
1266  *
1267  * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1268  * including ARBITRATION, SELECTION, and initial message out for
1269  * IDENTIFY and queue messages.
1270  *
1271  * Inputs : instance - instantiation of the 5380 driver on which this
1272  * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1273  * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1274  * the command that is presently connected.
1275  *
1276  * Returns : -1 if selection could not execute for some reason,
1277  * 0 if selection succeeded or failed because the target
1278  * did not respond.
1279  *
1280  * Side effects :
1281  * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1282  * with registers as they should have been on entry - ie
1283  * SELECT_ENABLE will be set appropriately, the NCR5380
1284  * will cease to drive any SCSI bus signals.
1285  *
1286  * If successful : I_T_L or I_T_L_Q nexus will be established,
1287  * instance->connected will be set to cmd.
1288  * SELECT interrupt will be disabled.
1289  *
1290  * If failed (no target) : cmd->scsi_done() will be called, and the
1291  * cmd->result host byte set to DID_BAD_TARGET.
1292  *
1293  * Locks: caller holds hostdata lock in IRQ mode
1294  */
1295 
1296 static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag)
1297 {
1299  struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1300  unsigned char tmp[3], phase;
1301  unsigned char *data;
1302  int len;
1303  unsigned long timeout;
1304  unsigned char value;
1305  int err;
1306  NCR5380_setup(instance);
1307 
1308  if (hostdata->selecting)
1309  goto part2;
1310 
1311  hostdata->restart_select = 0;
1312 
1313  NCR5380_dprint(NDEBUG_ARBITRATION, instance);
1314  dprintk(NDEBUG_ARBITRATION, ("scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id));
1315 
1316  /*
1317  * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1318  * data bus during SELECTION.
1319  */
1320 
1322 
1323  /*
1324  * Start arbitration.
1325  */
1326 
1329 
1330 
1331  /* We can be relaxed here, interrupts are on, we are
1332  in workqueue context, the birds are singing in the trees */
1333  spin_unlock_irq(instance->host_lock);
1334  err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ);
1335  spin_lock_irq(instance->host_lock);
1336  if (err < 0) {
1337  printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__);
1340  goto failed;
1341  }
1342 
1343  dprintk(NDEBUG_ARBITRATION, ("scsi%d : arbitration complete\n", instance->host_no));
1344 
1345  /*
1346  * The arbitration delay is 2.2us, but this is a minimum and there is
1347  * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1348  * the integral nature of udelay().
1349  *
1350  */
1351 
1352  udelay(3);
1353 
1354  /* Check for lost arbitration */
1357  dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no));
1358  goto failed;
1359  }
1361 
1362  if (!(hostdata->flags & FLAG_DTC3181E) &&
1363  /* RvC: DTC3181E has some trouble with this
1364  * so we simply removed it. Seems to work with
1365  * only Mustek scanner attached
1366  */
1367  (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
1370  dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no));
1371  goto failed;
1372  }
1373  /*
1374  * Again, bus clear + bus settle time is 1.2us, however, this is
1375  * a minimum so we'll udelay ceil(1.2)
1376  */
1377 
1378  udelay(2);
1379 
1380  dprintk(NDEBUG_ARBITRATION, ("scsi%d : won arbitration\n", instance->host_no));
1381 
1382  /*
1383  * Now that we have won arbitration, start Selection process, asserting
1384  * the host and target ID's on the SCSI bus.
1385  */
1386 
1387  NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd))));
1388 
1389  /*
1390  * Raise ATN while SEL is true before BSY goes false from arbitration,
1391  * since this is the only way to guarantee that we'll get a MESSAGE OUT
1392  * phase immediately after selection.
1393  */
1394 
1397 
1398  /*
1399  * Reselect interrupts must be turned off prior to the dropping of BSY,
1400  * otherwise we will trigger an interrupt.
1401  */
1403 
1404  /*
1405  * The initiator shall then wait at least two deskew delays and release
1406  * the BSY signal.
1407  */
1408  udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1409 
1410  /* Reset BSY */
1412 
1413  /*
1414  * Something weird happens when we cease to drive BSY - looks
1415  * like the board/chip is letting us do another read before the
1416  * appropriate propagation delay has expired, and we're confusing
1417  * a BSY signal from ourselves as the target's response to SELECTION.
1418  *
1419  * A small delay (the 'C++' frontend breaks the pipeline with an
1420  * unnecessary jump, making it work on my 386-33/Trantor T128, the
1421  * tighter 'C' code breaks and requires this) solves the problem -
1422  * the 1 us delay is arbitrary, and only used because this delay will
1423  * be the same on other platforms and since it works here, it should
1424  * work there.
1425  *
1426  * wingel suggests that this could be due to failing to wait
1427  * one deskew delay.
1428  */
1429 
1430  udelay(1);
1431 
1432  dprintk(NDEBUG_SELECTION, ("scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd)));
1433 
1434  /*
1435  * The SCSI specification calls for a 250 ms timeout for the actual
1436  * selection.
1437  */
1438 
1439  timeout = jiffies + (250 * HZ / 1000);
1440 
1441  /*
1442  * XXX very interesting - we're seeing a bounce where the BSY we
1443  * asserted is being reflected / still asserted (propagation delay?)
1444  * and it's detecting as true. Sigh.
1445  */
1446 
1447  hostdata->select_time = 0; /* we count the clock ticks at which we polled */
1448  hostdata->selecting = cmd;
1449 
1450 part2:
1451  /* RvC: here we enter after a sleeping period, or immediately after
1452  execution of part 1
1453  we poll only once ech clock tick */
1455 
1456  if (!value && (hostdata->select_time < HZ/4)) {
1457  /* RvC: we still must wait for a device response */
1458  hostdata->select_time++; /* after 25 ticks the device has failed */
1459  NCR5380_set_timer(hostdata, 1);
1460  return 0; /* RvC: we return here with hostdata->selecting set,
1461  to go to sleep */
1462  }
1463 
1464  hostdata->selecting = NULL;/* clear this pointer, because we passed the
1465  waiting period */
1466  if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1468  NCR5380_reselect(instance);
1469  printk("scsi%d : reselection after won arbitration?\n", instance->host_no);
1471  return -1;
1472  }
1473  /*
1474  * No less than two deskew delays after the initiator detects the
1475  * BSY signal is true, it shall release the SEL signal and may
1476  * change the DATA BUS. -wingel
1477  */
1478 
1479  udelay(1);
1480 
1482 
1483  if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1485  if (hostdata->targets_present & (1 << scmd_id(cmd))) {
1486  printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no);
1487  if (hostdata->restart_select)
1488  printk(KERN_DEBUG "\trestart select\n");
1489  NCR5380_dprint(NDEBUG_SELECTION, instance);
1491  return -1;
1492  }
1493  cmd->result = DID_BAD_TARGET << 16;
1494  collect_stats(hostdata, cmd);
1495  cmd->scsi_done(cmd);
1497  dprintk(NDEBUG_SELECTION, ("scsi%d : target did not respond within 250ms\n", instance->host_no));
1499  return 0;
1500  }
1501  hostdata->targets_present |= (1 << scmd_id(cmd));
1502 
1503  /*
1504  * Since we followed the SCSI spec, and raised ATN while SEL
1505  * was true but before BSY was false during selection, the information
1506  * transfer phase should be a MESSAGE OUT phase so that we can send the
1507  * IDENTIFY message.
1508  *
1509  * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1510  * message (2 bytes) with a tag ID that we increment with every command
1511  * until it wraps back to 0.
1512  *
1513  * XXX - it turns out that there are some broken SCSI-II devices,
1514  * which claim to support tagged queuing but fail when more than
1515  * some number of commands are issued at once.
1516  */
1517 
1518  /* Wait for start of REQ/ACK handshake */
1519 
1520  spin_unlock_irq(instance->host_lock);
1521  err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ);
1522  spin_lock_irq(instance->host_lock);
1523 
1524  if(err) {
1525  printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__);
1527  goto failed;
1528  }
1529 
1530  dprintk(NDEBUG_SELECTION, ("scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id));
1531  tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun);
1532 
1533  len = 1;
1534  cmd->tag = 0;
1535 
1536  /* Send message(s) */
1537  data = tmp;
1538  phase = PHASE_MSGOUT;
1539  NCR5380_transfer_pio(instance, &phase, &len, &data);
1540  dprintk(NDEBUG_SELECTION, ("scsi%d : nexus established.\n", instance->host_no));
1541  /* XXX need to handle errors here */
1542  hostdata->connected = cmd;
1543  hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1544 
1545  initialize_SCp(cmd);
1546 
1547  return 0;
1548 
1549  /* Selection failed */
1550 failed:
1551  return -1;
1552 
1553 }
1554 
1555 /*
1556  * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1557  * unsigned char *phase, int *count, unsigned char **data)
1558  *
1559  * Purpose : transfers data in given phase using polled I/O
1560  *
1561  * Inputs : instance - instance of driver, *phase - pointer to
1562  * what phase is expected, *count - pointer to number of
1563  * bytes to transfer, **data - pointer to data pointer.
1564  *
1565  * Returns : -1 when different phase is entered without transferring
1566  * maximum number of bytes, 0 if all bytes or transferred or exit
1567  * is in same phase.
1568  *
1569  * Also, *phase, *count, *data are modified in place.
1570  *
1571  * XXX Note : handling for bus free may be useful.
1572  */
1573 
1574 /*
1575  * Note : this code is not as quick as it could be, however it
1576  * IS 100% reliable, and for the actual data transfer where speed
1577  * counts, we will always do a pseudo DMA or DMA transfer.
1578  */
1579 
1580 static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1582  unsigned char p = *phase, tmp;
1583  int c = *count;
1584  unsigned char *d = *data;
1585  /*
1586  * RvC: some administrative data to process polling time
1587  */
1588  int break_allowed = 0;
1589  struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1590  NCR5380_setup(instance);
1591 
1592  if (!(p & SR_IO))
1593  dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c));
1594  else
1595  dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c));
1596 
1597  /*
1598  * The NCR5380 chip will only drive the SCSI bus when the
1599  * phase specified in the appropriate bits of the TARGET COMMAND
1600  * REGISTER match the STATUS REGISTER
1601  */
1602 
1604 
1605  /* RvC: don't know if this is necessary, but other SCSI I/O is short
1606  * so breaks are not necessary there
1607  */
1608  if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) {
1609  break_allowed = 1;
1610  }
1611  do {
1612  /*
1613  * Wait for assertion of REQ, after which the phase bits will be
1614  * valid
1615  */
1616 
1617  /* RvC: we simply poll once, after that we stop temporarily
1618  * and let the device buffer fill up
1619  * if breaking is not allowed, we keep polling as long as needed
1620  */
1621 
1622  /* FIXME */
1623  while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed);
1624  if (!(tmp & SR_REQ)) {
1625  /* timeout condition */
1626  NCR5380_set_timer(hostdata, USLEEP_SLEEP);
1627  break;
1628  }
1629 
1630  dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no));
1631 
1632  /* Check for phase mismatch */
1633  if ((tmp & PHASE_MASK) != p) {
1634  dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no));
1635  NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance);
1636  break;
1637  }
1638  /* Do actual transfer from SCSI bus to / from memory */
1639  if (!(p & SR_IO))
1641  else
1643 
1644  ++d;
1645 
1646  /*
1647  * The SCSI standard suggests that in MSGOUT phase, the initiator
1648  * should drop ATN on the last byte of the message phase
1649  * after REQ has been asserted for the handshake but before
1650  * the initiator raises ACK.
1651  */
1652 
1653  if (!(p & SR_IO)) {
1654  if (!((p & SR_MSG) && c > 1)) {
1656  NCR5380_dprint(NDEBUG_PIO, instance);
1658  } else {
1660  NCR5380_dprint(NDEBUG_PIO, instance);
1662  }
1663  } else {
1664  NCR5380_dprint(NDEBUG_PIO, instance);
1666  }
1667 
1668  /* FIXME - if this fails bus reset ?? */
1669  NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ);
1670  dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no));
1671 
1672 /*
1673  * We have several special cases to consider during REQ/ACK handshaking :
1674  * 1. We were in MSGOUT phase, and we are on the last byte of the
1675  * message. ATN must be dropped as ACK is dropped.
1676  *
1677  * 2. We are in a MSGIN phase, and we are on the last byte of the
1678  * message. We must exit with ACK asserted, so that the calling
1679  * code may raise ATN before dropping ACK to reject the message.
1680  *
1681  * 3. ACK and ATN are clear and the target may proceed as normal.
1682  */
1683  if (!(p == PHASE_MSGIN && c == 1)) {
1684  if (p == PHASE_MSGOUT && c > 1)
1686  else
1688  }
1689  } while (--c);
1690 
1691  dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c));
1692 
1693  *count = c;
1694  *data = d;
1695  tmp = NCR5380_read(STATUS_REG);
1696  if (tmp & SR_REQ)
1697  *phase = tmp & PHASE_MASK;
1698  else
1699  *phase = PHASE_UNKNOWN;
1700 
1701  if (!c || (*phase == p))
1702  return 0;
1703  else
1704  return -1;
1705 }
1706 
1717 static void do_reset(struct Scsi_Host *host) {
1719  NCR5380_setup(host);
1720 
1723  udelay(25);
1725 }
1726 
1727 /*
1728  * Function : do_abort (Scsi_Host *host)
1729  *
1730  * Purpose : abort the currently established nexus. Should only be
1731  * called from a routine which can drop into a
1732  *
1733  * Returns : 0 on success, -1 on failure.
1734  *
1735  * Locks: queue lock held by caller
1736  * FIXME: sort this out and get new_eh running
1737  */
1738 
1739 static int do_abort(struct Scsi_Host *host) {
1741  unsigned char *msgptr, phase, tmp;
1742  int len;
1743  int rc;
1744  NCR5380_setup(host);
1745 
1746 
1747  /* Request message out phase */
1749 
1750  /*
1751  * Wait for the target to indicate a valid phase by asserting
1752  * REQ. Once this happens, we'll have either a MSGOUT phase
1753  * and can immediately send the ABORT message, or we'll have some
1754  * other phase and will have to source/sink data.
1755  *
1756  * We really don't care what value was on the bus or what value
1757  * the target sees, so we just handshake.
1758  */
1759 
1760  rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ);
1761 
1762  if(rc < 0)
1763  return -1;
1764 
1765  tmp = (unsigned char)rc;
1766 
1768 
1769  if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1771  rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ);
1773  if(rc == -1)
1774  return -1;
1775  }
1776  tmp = ABORT;
1777  msgptr = &tmp;
1778  len = 1;
1779  phase = PHASE_MSGOUT;
1780  NCR5380_transfer_pio(host, &phase, &len, &msgptr);
1781 
1782  /*
1783  * If we got here, and the command completed successfully,
1784  * we're about to go into bus free state.
1785  */
1786 
1787  return len ? -1 : 0;
1788 }
1789 
1790 #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL)
1791 /*
1792  * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1793  * unsigned char *phase, int *count, unsigned char **data)
1794  *
1795  * Purpose : transfers data in given phase using either real
1796  * or pseudo DMA.
1797  *
1798  * Inputs : instance - instance of driver, *phase - pointer to
1799  * what phase is expected, *count - pointer to number of
1800  * bytes to transfer, **data - pointer to data pointer.
1801  *
1802  * Returns : -1 when different phase is entered without transferring
1803  * maximum number of bytes, 0 if all bytes or transferred or exit
1804  * is in same phase.
1805  *
1806  * Also, *phase, *count, *data are modified in place.
1807  *
1808  * Locks: io_request lock held by caller
1809  */
1810 
1811 
1812 static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1814  register int c = *count;
1815  register unsigned char p = *phase;
1816  register unsigned char *d = *data;
1817  unsigned char tmp;
1818  int foo;
1819 #if defined(REAL_DMA_POLL)
1820  int cnt, toPIO;
1821  unsigned char saved_data = 0, overrun = 0, residue;
1822 #endif
1823 
1824  struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1825 
1826  NCR5380_setup(instance);
1827 
1828  if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1829  *phase = tmp;
1830  return -1;
1831  }
1832 #if defined(REAL_DMA) || defined(REAL_DMA_POLL)
1833 #ifdef READ_OVERRUNS
1834  if (p & SR_IO) {
1835  c -= 2;
1836  }
1837 #endif
1838  dprintk(NDEBUG_DMA, ("scsi%d : initializing DMA channel %d for %s, %d bytes %s %0x\n", instance->host_no, instance->dma_channel, (p & SR_IO) ? "reading" : "writing", c, (p & SR_IO) ? "to" : "from", (unsigned) d));
1839  hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c);
1840 #endif
1841 
1843 
1844 #ifdef REAL_DMA
1846 #elif defined(REAL_DMA_POLL)
1848 #else
1849  /*
1850  * Note : on my sample board, watch-dog timeouts occurred when interrupts
1851  * were not disabled for the duration of a single DMA transfer, from
1852  * before the setting of DMA mode to after transfer of the last byte.
1853  */
1854 
1855 #if defined(PSEUDO_DMA) && defined(UNSAFE)
1856  spin_unlock_irq(instance->host_lock);
1857 #endif
1858  /* KLL May need eop and parity in 53c400 */
1859  if (hostdata->flags & FLAG_NCR53C400)
1863  else
1865 #endif /* def REAL_DMA */
1866 
1867  dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG)));
1868 
1869  /*
1870  * On the PAS16 at least I/O recovery delays are not needed here.
1871  * Everyone else seems to want them.
1872  */
1873 
1874  if (p & SR_IO) {
1875  io_recovery_delay(1);
1877  } else {
1878  io_recovery_delay(1);
1880  io_recovery_delay(1);
1882  io_recovery_delay(1);
1883  }
1884 
1885 #if defined(REAL_DMA_POLL)
1886  do {
1888  } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER)));
1889 
1890 /*
1891  At this point, either we've completed DMA, or we have a phase mismatch,
1892  or we've unexpectedly lost BUSY (which is a real error).
1893 
1894  For write DMAs, we want to wait until the last byte has been
1895  transferred out over the bus before we turn off DMA mode. Alas, there
1896  seems to be no terribly good way of doing this on a 5380 under all
1897  conditions. For non-scatter-gather operations, we can wait until REQ
1898  and ACK both go false, or until a phase mismatch occurs. Gather-writes
1899  are nastier, since the device will be expecting more data than we
1900  are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
1901  could test LAST BIT SENT to assure transfer (I imagine this is precisely
1902  why this signal was added to the newer chips) but on the older 538[01]
1903  this signal does not exist. The workaround for this lack is a watchdog;
1904  we bail out of the wait-loop after a modest amount of wait-time if
1905  the usual exit conditions are not met. Not a terribly clean or
1906  correct solution :-%
1907 
1908  Reads are equally tricky due to a nasty characteristic of the NCR5380.
1909  If the chip is in DMA mode for an READ, it will respond to a target's
1910  REQ by latching the SCSI data into the INPUT DATA register and asserting
1911  ACK, even if it has _already_ been notified by the DMA controller that
1912  the current DMA transfer has completed! If the NCR5380 is then taken
1913  out of DMA mode, this already-acknowledged byte is lost.
1914 
1915  This is not a problem for "one DMA transfer per command" reads, because
1916  the situation will never arise... either all of the data is DMA'ed
1917  properly, or the target switches to MESSAGE IN phase to signal a
1918  disconnection (either operation bringing the DMA to a clean halt).
1919  However, in order to handle scatter-reads, we must work around the
1920  problem. The chosen fix is to DMA N-2 bytes, then check for the
1921  condition before taking the NCR5380 out of DMA mode. One or two extra
1922  bytes are transferred via PIO as necessary to fill out the original
1923  request.
1924  */
1925 
1926  if (p & SR_IO) {
1927 #ifdef READ_OVERRUNS
1928  udelay(10);
1929  if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) {
1930  saved_data = NCR5380_read(INPUT_DATA_REGISTER);
1931  overrun = 1;
1932  }
1933 #endif
1934  } else {
1935  int limit = 100;
1936  while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) {
1937  if (!(tmp & BASR_PHASE_MATCH))
1938  break;
1939  if (--limit < 0)
1940  break;
1941  }
1942  }
1943 
1944  dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG)));
1945 
1948 
1949  residue = NCR5380_dma_residual(instance);
1950  c -= residue;
1951  *count -= c;
1952  *data += c;
1953  *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
1954 
1955 #ifdef READ_OVERRUNS
1956  if (*phase == p && (p & SR_IO) && residue == 0) {
1957  if (overrun) {
1958  dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n"));
1959  **data = saved_data;
1960  *data += 1;
1961  *count -= 1;
1962  cnt = toPIO = 1;
1963  } else {
1964  printk("No overrun??\n");
1965  cnt = toPIO = 2;
1966  }
1967  dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data));
1968  NCR5380_transfer_pio(instance, phase, &cnt, data);
1969  *count -= toPIO - cnt;
1970  }
1971 #endif
1972 
1973  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)));
1974  return 0;
1975 
1976 #elif defined(REAL_DMA)
1977  return 0;
1978 #else /* defined(REAL_DMA_POLL) */
1979  if (p & SR_IO) {
1980 #ifdef DMA_WORKS_RIGHT
1981  foo = NCR5380_pread(instance, d, c);
1982 #else
1983  int diff = 1;
1984  if (hostdata->flags & FLAG_NCR53C400) {
1985  diff = 0;
1986  }
1987  if (!(foo = NCR5380_pread(instance, d, c - diff))) {
1988  /*
1989  * We can't disable DMA mode after successfully transferring
1990  * what we plan to be the last byte, since that would open up
1991  * a race condition where if the target asserted REQ before
1992  * we got the DMA mode reset, the NCR5380 would have latched
1993  * an additional byte into the INPUT DATA register and we'd
1994  * have dropped it.
1995  *
1996  * The workaround was to transfer one fewer bytes than we
1997  * intended to with the pseudo-DMA read function, wait for
1998  * the chip to latch the last byte, read it, and then disable
1999  * pseudo-DMA mode.
2000  *
2001  * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
2002  * REQ is deasserted when ACK is asserted, and not reasserted
2003  * until ACK goes false. Since the NCR5380 won't lower ACK
2004  * until DACK is asserted, which won't happen unless we twiddle
2005  * the DMA port or we take the NCR5380 out of DMA mode, we
2006  * can guarantee that we won't handshake another extra
2007  * byte.
2008  */
2009 
2010  if (!(hostdata->flags & FLAG_NCR53C400)) {
2012  /* Wait for clean handshake */
2013  while (NCR5380_read(STATUS_REG) & SR_REQ);
2014  d[c - 1] = NCR5380_read(INPUT_DATA_REG);
2015  }
2016  }
2017 #endif
2018  } else {
2019 #ifdef DMA_WORKS_RIGHT
2020  foo = NCR5380_pwrite(instance, d, c);
2021 #else
2022  int timeout;
2023  dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c));
2024  if (!(foo = NCR5380_pwrite(instance, d, c))) {
2025  /*
2026  * Wait for the last byte to be sent. If REQ is being asserted for
2027  * the byte we're interested, we'll ACK it and it will go false.
2028  */
2029  if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) {
2030  timeout = 20000;
2031  while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH));
2032 
2033  if (!timeout)
2034  dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no));
2035 
2036  if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) {
2037  hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT;
2039  hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT;
2040  dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no));
2041  }
2042  }
2043  } else {
2044  dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n"));
2046  dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n"));
2047  }
2048  }
2049 #endif
2050  }
2053 
2054  if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) {
2055  dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n"));
2056  if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) {
2057  dprintk(NDEBUG_C400_PWRITE, ("53C400w: got it, reading reset interrupt reg\n"));
2059  } else {
2060  printk("53C400w: IRQ NOT THERE!\n");
2061  }
2062  }
2063  *data = d + c;
2064  *count = 0;
2065  *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
2066 #if defined(PSEUDO_DMA) && defined(UNSAFE)
2067  spin_lock_irq(instance->host_lock);
2068 #endif /* defined(REAL_DMA_POLL) */
2069  return foo;
2070 #endif /* def REAL_DMA */
2071 }
2072 #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */
2073 
2074 /*
2075  * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
2076  *
2077  * Purpose : run through the various SCSI phases and do as the target
2078  * directs us to. Operates on the currently connected command,
2079  * instance->connected.
2080  *
2081  * Inputs : instance, instance for which we are doing commands
2082  *
2083  * Side effects : SCSI things happen, the disconnected queue will be
2084  * modified if a command disconnects, *instance->connected will
2085  * change.
2086  *
2087  * XXX Note : we need to watch for bus free or a reset condition here
2088  * to recover from an unexpected bus free condition.
2089  *
2090  * Locks: io_request_lock held by caller in IRQ mode
2091  */
2092 
2093 static void NCR5380_information_transfer(struct Scsi_Host *instance) {
2095  struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata;
2096  unsigned char msgout = NOP;
2097  int sink = 0;
2098  int len;
2099 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2100  int transfersize;
2101 #endif
2102  unsigned char *data;
2103  unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
2104  Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
2105  /* RvC: we need to set the end of the polling time */
2106  unsigned long poll_time = jiffies + USLEEP_POLL;
2107 
2108  NCR5380_setup(instance);
2109 
2110  while (1) {
2111  tmp = NCR5380_read(STATUS_REG);
2112  /* We only have a valid SCSI phase when REQ is asserted */
2113  if (tmp & SR_REQ) {
2114  phase = (tmp & PHASE_MASK);
2115  if (phase != old_phase) {
2116  old_phase = phase;
2117  NCR5380_dprint_phase(NDEBUG_INFORMATION, instance);
2118  }
2119  if (sink && (phase != PHASE_MSGOUT)) {
2121 
2123  while (NCR5380_read(STATUS_REG) & SR_REQ);
2125  sink = 0;
2126  continue;
2127  }
2128  switch (phase) {
2129  case PHASE_DATAIN:
2130  case PHASE_DATAOUT:
2131 #if (NDEBUG & NDEBUG_NO_DATAOUT)
2132  printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no);
2133  sink = 1;
2134  do_abort(instance);
2135  cmd->result = DID_ERROR << 16;
2136  cmd->scsi_done(cmd);
2137  return;
2138 #endif
2139  /*
2140  * If there is no room left in the current buffer in the
2141  * scatter-gather list, move onto the next one.
2142  */
2143 
2144  if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2145  ++cmd->SCp.buffer;
2146  --cmd->SCp.buffers_residual;
2147  cmd->SCp.this_residual = cmd->SCp.buffer->length;
2148  cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
2149  dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual));
2150  }
2151  /*
2152  * The preferred transfer method is going to be
2153  * PSEUDO-DMA for systems that are strictly PIO,
2154  * since we can let the hardware do the handshaking.
2155  *
2156  * For this to work, we need to know the transfersize
2157  * ahead of time, since the pseudo-DMA code will sit
2158  * in an unconditional loop.
2159  */
2160 
2161 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2162  /* KLL
2163  * PSEUDO_DMA is defined here. If this is the g_NCR5380
2164  * driver then it will always be defined, so the
2165  * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
2166  * NCR5380 case. I think this is a fairly clean solution.
2167  * We supplement these 2 if's with the flag.
2168  */
2169 #ifdef NCR5380_dma_xfer_len
2170  if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) {
2171 #else
2172  transfersize = cmd->transfersize;
2173 
2174 #ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */
2175  if (transfersize > 512)
2176  transfersize = 512;
2177 #endif /* LIMIT_TRANSFERSIZE */
2178 
2179  if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) {
2180  /* Limit transfers to 32K, for xx400 & xx406
2181  * pseudoDMA that transfers in 128 bytes blocks. */
2182  if (transfersize > 32 * 1024)
2183  transfersize = 32 * 1024;
2184 #endif
2185  len = transfersize;
2186  if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) {
2187  /*
2188  * If the watchdog timer fires, all future accesses to this
2189  * device will use the polled-IO.
2190  */
2191  scmd_printk(KERN_INFO, cmd,
2192  "switching to slow handshake\n");
2193  cmd->device->borken = 1;
2195  sink = 1;
2196  do_abort(instance);
2197  cmd->result = DID_ERROR << 16;
2198  cmd->scsi_done(cmd);
2199  /* XXX - need to source or sink data here, as appropriate */
2200  } else
2201  cmd->SCp.this_residual -= transfersize - len;
2202  } else
2203 #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */
2204  NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **)
2205  &cmd->SCp.ptr);
2206  break;
2207  case PHASE_MSGIN:
2208  len = 1;
2209  data = &tmp;
2210  NCR5380_transfer_pio(instance, &phase, &len, &data);
2211  cmd->SCp.Message = tmp;
2212 
2213  switch (tmp) {
2214  /*
2215  * Linking lets us reduce the time required to get the
2216  * next command out to the device, hopefully this will
2217  * mean we don't waste another revolution due to the delays
2218  * required by ARBITRATION and another SELECTION.
2219  *
2220  * In the current implementation proposal, low level drivers
2221  * merely have to start the next command, pointed to by
2222  * next_link, done() is called as with unlinked commands.
2223  */
2224 #ifdef LINKED
2225  case LINKED_CMD_COMPLETE:
2227  /* Accept message by clearing ACK */
2229  dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun));
2230  /*
2231  * Sanity check : A linked command should only terminate with
2232  * one of these messages if there are more linked commands
2233  * available.
2234  */
2235  if (!cmd->next_link) {
2236  printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun);
2237  sink = 1;
2238  do_abort(instance);
2239  return;
2240  }
2241  initialize_SCp(cmd->next_link);
2242  /* The next command is still part of this process */
2243  cmd->next_link->tag = cmd->tag;
2244  cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2245  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));
2246  collect_stats(hostdata, cmd);
2247  cmd->scsi_done(cmd);
2248  cmd = hostdata->connected;
2249  break;
2250 #endif /* def LINKED */
2251  case ABORT:
2252  case COMMAND_COMPLETE:
2253  /* Accept message by clearing ACK */
2254  sink = 1;
2256  hostdata->connected = NULL;
2257  dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun));
2258  hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2259 
2260  /*
2261  * I'm not sure what the correct thing to do here is :
2262  *
2263  * If the command that just executed is NOT a request
2264  * sense, the obvious thing to do is to set the result
2265  * code to the values of the stored parameters.
2266  *
2267  * If it was a REQUEST SENSE command, we need some way
2268  * to differentiate between the failure code of the original
2269  * and the failure code of the REQUEST sense - the obvious
2270  * case is success, where we fall through and leave the result
2271  * code unchanged.
2272  *
2273  * The non-obvious place is where the REQUEST SENSE failed
2274  */
2275 
2276  if (cmd->cmnd[0] != REQUEST_SENSE)
2277  cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2278  else if (status_byte(cmd->SCp.Status) != GOOD)
2279  cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2280 
2281 #ifdef AUTOSENSE
2282  if ((cmd->cmnd[0] == REQUEST_SENSE) &&
2283  hostdata->ses.cmd_len) {
2284  scsi_eh_restore_cmnd(cmd, &hostdata->ses);
2285  hostdata->ses.cmd_len = 0 ;
2286  }
2287 
2288  if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2289  scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
2290 
2291  dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no));
2292 
2293  LIST(cmd, hostdata->issue_queue);
2294  cmd->host_scribble = (unsigned char *)
2295  hostdata->issue_queue;
2296  hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2297  dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no));
2298  } else
2299 #endif /* def AUTOSENSE */
2300  {
2301  collect_stats(hostdata, cmd);
2302  cmd->scsi_done(cmd);
2303  }
2304 
2306  /*
2307  * Restore phase bits to 0 so an interrupted selection,
2308  * arbitration can resume.
2309  */
2311 
2312  while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2313  barrier();
2314  return;
2315  case MESSAGE_REJECT:
2316  /* Accept message by clearing ACK */
2318  switch (hostdata->last_message) {
2319  case HEAD_OF_QUEUE_TAG:
2320  case ORDERED_QUEUE_TAG:
2321  case SIMPLE_QUEUE_TAG:
2322  cmd->device->simple_tags = 0;
2323  hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2324  break;
2325  default:
2326  break;
2327  }
2328  case DISCONNECT:{
2329  /* Accept message by clearing ACK */
2331  cmd->device->disconnect = 1;
2332  LIST(cmd, hostdata->disconnected_queue);
2333  cmd->host_scribble = (unsigned char *)
2334  hostdata->disconnected_queue;
2335  hostdata->connected = NULL;
2336  hostdata->disconnected_queue = cmd;
2337  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));
2338  /*
2339  * Restore phase bits to 0 so an interrupted selection,
2340  * arbitration can resume.
2341  */
2343 
2344  /* Enable reselect interrupts */
2346  /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/
2347  /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */
2348  while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2349  barrier();
2350  return;
2351  }
2352  /*
2353  * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2354  * operation, in violation of the SCSI spec so we can safely
2355  * ignore SAVE/RESTORE pointers calls.
2356  *
2357  * Unfortunately, some disks violate the SCSI spec and
2358  * don't issue the required SAVE_POINTERS message before
2359  * disconnecting, and we have to break spec to remain
2360  * compatible.
2361  */
2362  case SAVE_POINTERS:
2363  case RESTORE_POINTERS:
2364  /* Accept message by clearing ACK */
2366  break;
2367  case EXTENDED_MESSAGE:
2368 /*
2369  * Extended messages are sent in the following format :
2370  * Byte
2371  * 0 EXTENDED_MESSAGE == 1
2372  * 1 length (includes one byte for code, doesn't
2373  * include first two bytes)
2374  * 2 code
2375  * 3..length+1 arguments
2376  *
2377  * Start the extended message buffer with the EXTENDED_MESSAGE
2378  * byte, since spi_print_msg() wants the whole thing.
2379  */
2380  extended_msg[0] = EXTENDED_MESSAGE;
2381  /* Accept first byte by clearing ACK */
2383  dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no));
2384 
2385  len = 2;
2386  data = extended_msg + 1;
2387  phase = PHASE_MSGIN;
2388  NCR5380_transfer_pio(instance, &phase, &len, &data);
2389 
2390  dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2]));
2391 
2392  if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) {
2393  /* Accept third byte by clearing ACK */
2395  len = extended_msg[1] - 1;
2396  data = extended_msg + 3;
2397  phase = PHASE_MSGIN;
2398 
2399  NCR5380_transfer_pio(instance, &phase, &len, &data);
2400  dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len));
2401 
2402  switch (extended_msg[2]) {
2403  case EXTENDED_SDTR:
2404  case EXTENDED_WDTR:
2407  tmp = 0;
2408  }
2409  } else if (len) {
2410  printk("scsi%d: error receiving extended message\n", instance->host_no);
2411  tmp = 0;
2412  } else {
2413  printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]);
2414  tmp = 0;
2415  }
2416  /* Fall through to reject message */
2417 
2418  /*
2419  * If we get something weird that we aren't expecting,
2420  * reject it.
2421  */
2422  default:
2423  if (!tmp) {
2424  printk("scsi%d: rejecting message ", instance->host_no);
2425  spi_print_msg(extended_msg);
2426  printk("\n");
2427  } else if (tmp != EXTENDED_MESSAGE)
2428  scmd_printk(KERN_INFO, cmd,
2429  "rejecting unknown message %02x\n",tmp);
2430  else
2431  scmd_printk(KERN_INFO, cmd,
2432  "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]);
2433 
2436  break;
2437  } /* switch (tmp) */
2438  break;
2439  case PHASE_MSGOUT:
2440  len = 1;
2441  data = &msgout;
2442  hostdata->last_message = msgout;
2443  NCR5380_transfer_pio(instance, &phase, &len, &data);
2444  if (msgout == ABORT) {
2445  hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2446  hostdata->connected = NULL;
2447  cmd->result = DID_ERROR << 16;
2448  collect_stats(hostdata, cmd);
2449  cmd->scsi_done(cmd);
2451  return;
2452  }
2453  msgout = NOP;
2454  break;
2455  case PHASE_CMDOUT:
2456  len = cmd->cmd_len;
2457  data = cmd->cmnd;
2458  /*
2459  * XXX for performance reasons, on machines with a
2460  * PSEUDO-DMA architecture we should probably
2461  * use the dma transfer function.
2462  */
2463  NCR5380_transfer_pio(instance, &phase, &len, &data);
2464  if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) {
2465  NCR5380_set_timer(hostdata, USLEEP_SLEEP);
2466  dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
2467  return;
2468  }
2469  break;
2470  case PHASE_STATIN:
2471  len = 1;
2472  data = &tmp;
2473  NCR5380_transfer_pio(instance, &phase, &len, &data);
2474  cmd->SCp.Status = tmp;
2475  break;
2476  default:
2477  printk("scsi%d : unknown phase\n", instance->host_no);
2478  NCR5380_dprint(NDEBUG_ALL, instance);
2479  } /* switch(phase) */
2480  } /* if (tmp * SR_REQ) */
2481  else {
2482  /* RvC: go to sleep if polling time expired
2483  */
2484  if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) {
2485  NCR5380_set_timer(hostdata, USLEEP_SLEEP);
2486  dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
2487  return;
2488  }
2489  }
2490  } /* while (1) */
2491 }
2492 
2493 /*
2494  * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2495  *
2496  * Purpose : does reselection, initializing the instance->connected
2497  * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2498  * nexus has been reestablished,
2499  *
2500  * Inputs : instance - this instance of the NCR5380.
2501  *
2502  * Locks: io_request_lock held by caller if IRQ driven
2503  */
2504 
2505 static void NCR5380_reselect(struct Scsi_Host *instance) {
2507  struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
2508  instance->hostdata;
2509  unsigned char target_mask;
2510  unsigned char lun, phase;
2511  int len;
2512  unsigned char msg[3];
2513  unsigned char *data;
2514  Scsi_Cmnd *tmp = NULL, *prev;
2515  int abort = 0;
2516  NCR5380_setup(instance);
2517 
2518  /*
2519  * Disable arbitration, etc. since the host adapter obviously
2520  * lost, and tell an interrupted NCR5380_select() to restart.
2521  */
2522 
2524  hostdata->restart_select = 1;
2525 
2526  target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2527  dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no));
2528 
2529  /*
2530  * At this point, we have detected that our SCSI ID is on the bus,
2531  * SEL is true and BSY was false for at least one bus settle delay
2532  * (400 ns).
2533  *
2534  * We must assert BSY ourselves, until the target drops the SEL
2535  * signal.
2536  */
2537 
2539 
2540  /* FIXME: timeout too long, must fail to workqueue */
2541  if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0)
2542  abort = 1;
2543 
2545 
2546  /*
2547  * Wait for target to go into MSGIN.
2548  * FIXME: timeout needed and fail to work queeu
2549  */
2550 
2551  if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ))
2552  abort = 1;
2553 
2554  len = 1;
2555  data = msg;
2556  phase = PHASE_MSGIN;
2557  NCR5380_transfer_pio(instance, &phase, &len, &data);
2558 
2559  if (!(msg[0] & 0x80)) {
2560  printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no);
2561  spi_print_msg(msg);
2562  abort = 1;
2563  } else {
2564  /* Accept message by clearing ACK */
2566  lun = (msg[0] & 0x07);
2567 
2568  /*
2569  * We need to add code for SCSI-II to track which devices have
2570  * I_T_L_Q nexuses established, and which have simple I_T_L
2571  * nexuses so we can chose to do additional data transfer.
2572  */
2573 
2574  /*
2575  * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2576  * just reestablished, and remove it from the disconnected queue.
2577  */
2578 
2579 
2580  for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
2581  if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2582  ) {
2583  if (prev) {
2584  REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
2585  prev->host_scribble = tmp->host_scribble;
2586  } else {
2587  REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble);
2588  hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble;
2589  }
2590  tmp->host_scribble = NULL;
2591  break;
2592  }
2593  if (!tmp) {
2594  printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun);
2595  /*
2596  * Since we have an established nexus that we can't do anything with,
2597  * we must abort it.
2598  */
2599  abort = 1;
2600  }
2601  }
2602 
2603  if (abort) {
2604  do_abort(instance);
2605  } else {
2606  hostdata->connected = tmp;
2607  dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag));
2608  }
2609 }
2610 
2611 /*
2612  * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
2613  *
2614  * Purpose : called by interrupt handler when DMA finishes or a phase
2615  * mismatch occurs (which would finish the DMA transfer).
2616  *
2617  * Inputs : instance - this instance of the NCR5380.
2618  *
2619  * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L
2620  * nexus has been reestablished, on failure NULL is returned.
2621  */
2622 
2623 #ifdef REAL_DMA
2624 static void NCR5380_dma_complete(NCR5380_instance * instance) {
2626  struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
2627  int transferred;
2628  NCR5380_setup(instance);
2629 
2630  /*
2631  * XXX this might not be right.
2632  *
2633  * Wait for final byte to transfer, ie wait for ACK to go false.
2634  *
2635  * We should use the Last Byte Sent bit, unfortunately this is
2636  * not available on the 5380/5381 (only the various CMOS chips)
2637  *
2638  * FIXME: timeout, and need to handle long timeout/irq case
2639  */
2640 
2641  NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ);
2642 
2645 
2646  /*
2647  * The only places we should see a phase mismatch and have to send
2648  * data from the same set of pointers will be the data transfer
2649  * phases. So, residual, requested length are only important here.
2650  */
2651 
2652  if (!(hostdata->connected->SCp.phase & SR_CD)) {
2653  transferred = instance->dmalen - NCR5380_dma_residual();
2654  hostdata->connected->SCp.this_residual -= transferred;
2655  hostdata->connected->SCp.ptr += transferred;
2656  }
2657 }
2658 #endif /* def REAL_DMA */
2659 
2660 /*
2661  * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2662  *
2663  * Purpose : abort a command
2664  *
2665  * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2666  * host byte of the result field to, if zero DID_ABORTED is
2667  * used.
2668  *
2669  * Returns : 0 - success, -1 on failure.
2670  *
2671  * XXX - there is no way to abort the command that is currently
2672  * connected, you have to wait for it to complete. If this is
2673  * a problem, we could implement longjmp() / setjmp(), setjmp()
2674  * called where the loop started in NCR5380_main().
2675  *
2676  * Locks: host lock taken by caller
2677  */
2678 
2679 static int NCR5380_abort(Scsi_Cmnd * cmd) {
2681  struct Scsi_Host *instance = cmd->device->host;
2682  struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
2683  Scsi_Cmnd *tmp, **prev;
2684 
2685  printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no);
2686  scsi_print_command(cmd);
2687 
2688  NCR5380_print_status(instance);
2689 
2690  NCR5380_setup(instance);
2691 
2692  dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no));
2694 
2695 #if 0
2696 /*
2697  * Case 1 : If the command is the currently executing command,
2698  * we'll set the aborted flag and return control so that
2699  * information transfer routine can exit cleanly.
2700  */
2701 
2702  if (hostdata->connected == cmd) {
2703  dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no));
2704  hostdata->aborted = 1;
2705 /*
2706  * We should perform BSY checking, and make sure we haven't slipped
2707  * into BUS FREE.
2708  */
2709 
2711 /*
2712  * Since we can't change phases until we've completed the current
2713  * handshake, we have to source or sink a byte of data if the current
2714  * phase is not MSGOUT.
2715  */
2716 
2717 /*
2718  * Return control to the executing NCR drive so we can clear the
2719  * aborted flag and get back into our main loop.
2720  */
2721 
2722  return 0;
2723  }
2724 #endif
2725 
2726 /*
2727  * Case 2 : If the command hasn't been issued yet, we simply remove it
2728  * from the issue queue.
2729  */
2730 
2731  dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no));
2732  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)
2733  if (cmd == tmp) {
2734  REMOVE(5, *prev, tmp, tmp->host_scribble);
2735  (*prev) = (Scsi_Cmnd *) tmp->host_scribble;
2736  tmp->host_scribble = NULL;
2737  tmp->result = DID_ABORT << 16;
2738  dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no));
2739  tmp->scsi_done(tmp);
2740  return SUCCESS;
2741  }
2742 #if (NDEBUG & NDEBUG_ABORT)
2743  /* KLL */
2744  else if (prev == tmp)
2745  printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no);
2746 #endif
2747 
2748 /*
2749  * Case 3 : If any commands are connected, we're going to fail the abort
2750  * and let the high level SCSI driver retry at a later time or
2751  * issue a reset.
2752  *
2753  * Timeouts, and therefore aborted commands, will be highly unlikely
2754  * and handling them cleanly in this situation would make the common
2755  * case of noresets less efficient, and would pollute our code. So,
2756  * we fail.
2757  */
2758 
2759  if (hostdata->connected) {
2760  dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no));
2761  return FAILED;
2762  }
2763 /*
2764  * Case 4: If the command is currently disconnected from the bus, and
2765  * there are no connected commands, we reconnect the I_T_L or
2766  * I_T_L_Q nexus associated with it, go into message out, and send
2767  * an abort message.
2768  *
2769  * This case is especially ugly. In order to reestablish the nexus, we
2770  * need to call NCR5380_select(). The easiest way to implement this
2771  * function was to abort if the bus was busy, and let the interrupt
2772  * handler triggered on the SEL for reselect take care of lost arbitrations
2773  * where necessary, meaning interrupts need to be enabled.
2774  *
2775  * When interrupts are enabled, the queues may change - so we
2776  * can't remove it from the disconnected queue before selecting it
2777  * because that could cause a failure in hashing the nexus if that
2778  * device reselected.
2779  *
2780  * Since the queues may change, we can't use the pointers from when we
2781  * first locate it.
2782  *
2783  * So, we must first locate the command, and if NCR5380_select()
2784  * succeeds, then issue the abort, relocate the command and remove
2785  * it from the disconnected queue.
2786  */
2787 
2788  for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble)
2789  if (cmd == tmp) {
2790  dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no));
2791 
2792  if (NCR5380_select(instance, cmd, (int) cmd->tag))
2793  return FAILED;
2794  dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no));
2795 
2796  do_abort(instance);
2797 
2798  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)
2799  if (cmd == tmp) {
2800  REMOVE(5, *prev, tmp, tmp->host_scribble);
2801  *prev = (Scsi_Cmnd *) tmp->host_scribble;
2802  tmp->host_scribble = NULL;
2803  tmp->result = DID_ABORT << 16;
2804  tmp->scsi_done(tmp);
2805  return SUCCESS;
2806  }
2807  }
2808 /*
2809  * Case 5 : If we reached this point, the command was not found in any of
2810  * the queues.
2811  *
2812  * We probably reached this point because of an unlikely race condition
2813  * between the command completing successfully and the abortion code,
2814  * so we won't panic, but we will notify the user in case something really
2815  * broke.
2816  */
2817  printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n"
2818  " before abortion\n", instance->host_no);
2819  return FAILED;
2820 }
2821 
2822 
2823 /*
2824  * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd)
2825  *
2826  * Purpose : reset the SCSI bus.
2827  *
2828  * Returns : SUCCESS
2829  *
2830  * Locks: host lock taken by caller
2831  */
2832 
2833 static int NCR5380_bus_reset(Scsi_Cmnd * cmd)
2834 {
2835  struct Scsi_Host *instance = cmd->device->host;
2836 
2838  NCR5380_setup(instance);
2839  NCR5380_print_status(instance);
2840 
2841  spin_lock_irq(instance->host_lock);
2842  do_reset(instance);
2843  spin_unlock_irq(instance->host_lock);
2844 
2845  return SUCCESS;
2846 }