File: /usr/src/linux/drivers/scsi/sun3_NCR5380.c
1 /* sun3_NCR5380.c -- adapted from atari_NCR5380.c for the sun3 by
2 Sam Creasey. */
3 /*
4 * NCR 5380 generic driver routines. These should make it *trivial*
5 * to implement 5380 SCSI drivers under Linux with a non-trantor
6 * architecture.
7 *
8 * Note that these routines also work with NR53c400 family chips.
9 *
10 * Copyright 1993, Drew Eckhardt
11 * Visionary Computing
12 * (Unix and Linux consulting and custom programming)
13 * drew@colorado.edu
14 * +1 (303) 666-5836
15 *
16 * DISTRIBUTION RELEASE 6.
17 *
18 * For more information, please consult
19 *
20 * NCR 5380 Family
21 * SCSI Protocol Controller
22 * Databook
23 *
24 * NCR Microelectronics
25 * 1635 Aeroplaza Drive
26 * Colorado Springs, CO 80916
27 * 1+ (719) 578-3400
28 * 1+ (800) 334-5454
29 */
30
31 /*
32 * ++roman: To port the 5380 driver to the Atari, I had to do some changes in
33 * this file, too:
34 *
35 * - Some of the debug statements were incorrect (undefined variables and the
36 * like). I fixed that.
37 *
38 * - In information_transfer(), I think a #ifdef was wrong. Looking at the
39 * possible DMA transfer size should also happen for REAL_DMA. I added this
40 * in the #if statement.
41 *
42 * - When using real DMA, information_transfer() should return in a DATAOUT
43 * phase after starting the DMA. It has nothing more to do.
44 *
45 * - The interrupt service routine should run main after end of DMA, too (not
46 * only after RESELECTION interrupts). Additionally, it should _not_ test
47 * for more interrupts after running main, since a DMA process may have
48 * been started and interrupts are turned on now. The new int could happen
49 * inside the execution of NCR5380_intr(), leading to recursive
50 * calls.
51 *
52 * - I've added a function merge_contiguous_buffers() that tries to
53 * merge scatter-gather buffers that are located at contiguous
54 * physical addresses and can be processed with the same DMA setup.
55 * Since most scatter-gather operations work on a page (4K) of
56 * 4 buffers (1K), in more than 90% of all cases three interrupts and
57 * DMA setup actions are saved.
58 *
59 * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA
60 * and USLEEP, because these were messing up readability and will never be
61 * needed for Atari SCSI.
62 *
63 * - I've revised the NCR5380_main() calling scheme (relax the 'main_running'
64 * stuff), and 'main' is executed in a bottom half if awoken by an
65 * interrupt.
66 *
67 * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..."
68 * constructs. In my eyes, this made the source rather unreadable, so I
69 * finally replaced that by the *_PRINTK() macros.
70 *
71 */
72
73 /*
74 * Further development / testing that should be done :
75 * 1. Test linked command handling code after Eric is ready with
76 * the high level code.
77 */
78
79 #if (NDEBUG & NDEBUG_LISTS)
80 #define LIST(x,y) \
81 { printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); \
82 if ((x)==(y)) udelay(5); }
83 #define REMOVE(w,x,y,z) \
84 { printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, \
85 (void*)(w), (void*)(x), (void*)(y), (void*)(z)); \
86 if ((x)==(y)) udelay(5); }
87 #else
88 #define LIST(x,y)
89 #define REMOVE(w,x,y,z)
90 #endif
91
92 #ifndef notyet
93 #undef LINKED
94 #endif
95
96 /*
97 * Design
98 * Issues :
99 *
100 * The other Linux SCSI drivers were written when Linux was Intel PC-only,
101 * and specifically for each board rather than each chip. This makes their
102 * adaptation to platforms like the Mac (Some of which use NCR5380's)
103 * more difficult than it has to be.
104 *
105 * Also, many of the SCSI drivers were written before the command queuing
106 * routines were implemented, meaning their implementations of queued
107 * commands were hacked on rather than designed in from the start.
108 *
109 * When I designed the Linux SCSI drivers I figured that
110 * while having two different SCSI boards in a system might be useful
111 * for debugging things, two of the same type wouldn't be used.
112 * Well, I was wrong and a number of users have mailed me about running
113 * multiple high-performance SCSI boards in a server.
114 *
115 * Finally, when I get questions from users, I have no idea what
116 * revision of my driver they are running.
117 *
118 * This driver attempts to address these problems :
119 * This is a generic 5380 driver. To use it on a different platform,
120 * one simply writes appropriate system specific macros (ie, data
121 * transfer - some PC's will use the I/O bus, 68K's must use
122 * memory mapped) and drops this file in their 'C' wrapper.
123 *
124 * As far as command queueing, two queues are maintained for
125 * each 5380 in the system - commands that haven't been issued yet,
126 * and commands that are currently executing. This means that an
127 * unlimited number of commands may be queued, letting
128 * more commands propagate from the higher driver levels giving higher
129 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
130 * allowing multiple commands to propagate all the way to a SCSI-II device
131 * while a command is already executing.
132 *
133 * To solve the multiple-boards-in-the-same-system problem,
134 * there is a separate instance structure for each instance
135 * of a 5380 in the system. So, multiple NCR5380 drivers will
136 * be able to coexist with appropriate changes to the high level
137 * SCSI code.
138 *
139 * A NCR5380_PUBLIC_REVISION macro is provided, with the release
140 * number (updated for each public release) printed by the
141 * NCR5380_print_options command, which should be called from the
142 * wrapper detect function, so that I know what release of the driver
143 * users are using.
144 *
145 * Issues specific to the NCR5380 :
146 *
147 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
148 * piece of hardware that requires you to sit in a loop polling for
149 * the REQ signal as long as you are connected. Some devices are
150 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
151 * while doing long seek operations.
152 *
153 * The workaround for this is to keep track of devices that have
154 * disconnected. If the device hasn't disconnected, for commands that
155 * should disconnect, we do something like
156 *
157 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
158 *
159 * Some tweaking of N and M needs to be done. An algorithm based
160 * on "time to data" would give the best results as long as short time
161 * to datas (ie, on the same track) were considered, however these
162 * broken devices are the exception rather than the rule and I'd rather
163 * spend my time optimizing for the normal case.
164 *
165 * Architecture :
166 *
167 * At the heart of the design is a coroutine, NCR5380_main,
168 * which is started when not running by the interrupt handler,
169 * timer, and queue command function. It attempts to establish
170 * I_T_L or I_T_L_Q nexuses by removing the commands from the
171 * issue queue and calling NCR5380_select() if a nexus
172 * is not established.
173 *
174 * Once a nexus is established, the NCR5380_information_transfer()
175 * phase goes through the various phases as instructed by the target.
176 * if the target goes into MSG IN and sends a DISCONNECT message,
177 * the command structure is placed into the per instance disconnected
178 * queue, and NCR5380_main tries to find more work. If USLEEP
179 * was defined, and the target is idle for too long, the system
180 * 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 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
204 * for commands that return with a CHECK CONDITION status.
205 *
206 * LINKED - if defined, linked commands are supported.
207 *
208 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
209 *
210 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
211 *
212 * These macros MUST be defined :
213 *
214 * NCR5380_read(register) - read from the specified register
215 *
216 * NCR5380_write(register, value) - write to the specific register
217 *
218 * Either real DMA *or* pseudo DMA may be implemented
219 * REAL functions :
220 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
221 * Note that the DMA setup functions should return the number of bytes
222 * that they were able to program the controller for.
223 *
224 * Also note that generic i386/PC versions of these macros are
225 * available as NCR5380_i386_dma_write_setup,
226 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
227 *
228 * NCR5380_dma_write_setup(instance, src, count) - initialize
229 * NCR5380_dma_read_setup(instance, dst, count) - initialize
230 * NCR5380_dma_residual(instance); - residual count
231 *
232 * PSEUDO functions :
233 * NCR5380_pwrite(instance, src, count)
234 * NCR5380_pread(instance, dst, count);
235 *
236 * If nothing specific to this implementation needs doing (ie, with external
237 * hardware), you must also define
238 *
239 * NCR5380_queue_command
240 * NCR5380_reset
241 * NCR5380_abort
242 * NCR5380_proc_info
243 *
244 * to be the global entry points into the specific driver, ie
245 * #define NCR5380_queue_command t128_queue_command.
246 *
247 * If this is not done, the routines will be defined as static functions
248 * with the NCR5380* names and the user must provide a globally
249 * accessible wrapper function.
250 *
251 * The generic driver is initialized by calling NCR5380_init(instance),
252 * after setting the appropriate host specific fields and ID. If the
253 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
254 * possible) function may be used. Before the specific driver initialization
255 * code finishes, NCR5380_print_options should be called.
256 */
257
258 static struct Scsi_Host *first_instance = NULL;
259 static Scsi_Host_Template *the_template = NULL;
260
261 /* Macros ease life... :-) */
262 #define SETUP_HOSTDATA(in) \
263 struct NCR5380_hostdata *hostdata = \
264 (struct NCR5380_hostdata *)(in)->hostdata
265 #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
266
267 #define NEXT(cmd) ((Scsi_Cmnd *)((cmd)->host_scribble))
268 #define NEXTADDR(cmd) ((Scsi_Cmnd **)&((cmd)->host_scribble))
269
270 #define HOSTNO instance->host_no
271 #define H_NO(cmd) (cmd)->host->host_no
272
273 #ifdef SUPPORT_TAGS
274
275 /*
276 * Functions for handling tagged queuing
277 * =====================================
278 *
279 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
280 *
281 * Using consecutive numbers for the tags is no good idea in my eyes. There
282 * could be wrong re-usings if the counter (8 bit!) wraps and some early
283 * command has been preempted for a long time. My solution: a bitfield for
284 * remembering used tags.
285 *
286 * There's also the problem that each target has a certain queue size, but we
287 * cannot know it in advance :-( We just see a QUEUE_FULL status being
288 * returned. So, in this case, the driver internal queue size assumption is
289 * reduced to the number of active tags if QUEUE_FULL is returned by the
290 * target. The command is returned to the mid-level, but with status changed
291 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
292 * correctly.
293 *
294 * We're also not allowed running tagged commands as long as an untagged
295 * command is active. And REQUEST SENSE commands after a contingent allegiance
296 * condition _must_ be untagged. To keep track whether an untagged command has
297 * been issued, the host->busy array is still employed, as it is without
298 * support for tagged queuing.
299 *
300 * One could suspect that there are possible race conditions between
301 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
302 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
303 * which already guaranteed to be running at most once. It is also the only
304 * place where tags/LUNs are allocated. So no other allocation can slip
305 * between that pair, there could only happen a reselection, which can free a
306 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
307 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
308 */
309
310 /* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
311 #undef TAG_NONE
312 #define TAG_NONE 0xff
313
314 /* For the m68k, the number of bits in 'allocated' must be a multiple of 32! */
315 #if (MAX_TAGS % 32) != 0
316 #error "MAX_TAGS must be a multiple of 32!"
317 #endif
318
319 typedef struct {
320 char allocated[MAX_TAGS/8];
321 int nr_allocated;
322 int queue_size;
323 } TAG_ALLOC;
324
325 static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */
326
327
328 static void __init init_tags( void )
329 {
330 int target, lun;
331 TAG_ALLOC *ta;
332
333 if (!setup_use_tagged_queuing)
334 return;
335
336 for( target = 0; target < 8; ++target ) {
337 for( lun = 0; lun < 8; ++lun ) {
338 ta = &TagAlloc[target][lun];
339 memset( &ta->allocated, 0, MAX_TAGS/8 );
340 ta->nr_allocated = 0;
341 /* At the beginning, assume the maximum queue size we could
342 * support (MAX_TAGS). This value will be decreased if the target
343 * returns QUEUE_FULL status.
344 */
345 ta->queue_size = MAX_TAGS;
346 }
347 }
348 }
349
350
351 /* Check if we can issue a command to this LUN: First see if the LUN is marked
352 * busy by an untagged command. If the command should use tagged queuing, also
353 * check that there is a free tag and the target's queue won't overflow. This
354 * function should be called with interrupts disabled to avoid race
355 * conditions.
356 */
357
358 static int is_lun_busy( Scsi_Cmnd *cmd, int should_be_tagged )
359 {
360 SETUP_HOSTDATA(cmd->host);
361
362 if (hostdata->busy[cmd->target] & (1 << cmd->lun))
363 return( 1 );
364 if (!should_be_tagged ||
365 !setup_use_tagged_queuing || !cmd->device->tagged_supported)
366 return( 0 );
367 if (TagAlloc[cmd->target][cmd->lun].nr_allocated >=
368 TagAlloc[cmd->target][cmd->lun].queue_size ) {
369 TAG_PRINTK( "scsi%d: target %d lun %d: no free tags\n",
370 H_NO(cmd), cmd->target, cmd->lun );
371 return( 1 );
372 }
373 return( 0 );
374 }
375
376
377 /* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
378 * must be called before!), or reserve the LUN in 'busy' if the command is
379 * untagged.
380 */
381
382 static void cmd_get_tag( Scsi_Cmnd *cmd, int should_be_tagged )
383 {
384 SETUP_HOSTDATA(cmd->host);
385
386 /* If we or the target don't support tagged queuing, allocate the LUN for
387 * an untagged command.
388 */
389 if (!should_be_tagged ||
390 !setup_use_tagged_queuing || !cmd->device->tagged_supported) {
391 cmd->tag = TAG_NONE;
392 hostdata->busy[cmd->target] |= (1 << cmd->lun);
393 TAG_PRINTK( "scsi%d: target %d lun %d now allocated by untagged "
394 "command\n", H_NO(cmd), cmd->target, cmd->lun );
395 }
396 else {
397 TAG_ALLOC *ta = &TagAlloc[cmd->target][cmd->lun];
398
399 cmd->tag = find_first_zero_bit( &ta->allocated, MAX_TAGS );
400 set_bit( cmd->tag, &ta->allocated );
401 ta->nr_allocated++;
402 TAG_PRINTK( "scsi%d: using tag %d for target %d lun %d "
403 "(now %d tags in use)\n",
404 H_NO(cmd), cmd->tag, cmd->target, cmd->lun,
405 ta->nr_allocated );
406 }
407 }
408
409
410 /* Mark the tag of command 'cmd' as free, or in case of an untagged command,
411 * unlock the LUN.
412 */
413
414 static void cmd_free_tag( Scsi_Cmnd *cmd )
415 {
416 SETUP_HOSTDATA(cmd->host);
417
418 if (cmd->tag == TAG_NONE) {
419 hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
420 TAG_PRINTK( "scsi%d: target %d lun %d untagged cmd finished\n",
421 H_NO(cmd), cmd->target, cmd->lun );
422 }
423 else if (cmd->tag >= MAX_TAGS) {
424 printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
425 H_NO(cmd), cmd->tag );
426 }
427 else {
428 TAG_ALLOC *ta = &TagAlloc[cmd->target][cmd->lun];
429 clear_bit( cmd->tag, &ta->allocated );
430 ta->nr_allocated--;
431 TAG_PRINTK( "scsi%d: freed tag %d for target %d lun %d\n",
432 H_NO(cmd), cmd->tag, cmd->target, cmd->lun );
433 }
434 }
435
436
437 static void free_all_tags( void )
438 {
439 int target, lun;
440 TAG_ALLOC *ta;
441
442 if (!setup_use_tagged_queuing)
443 return;
444
445 for( target = 0; target < 8; ++target ) {
446 for( lun = 0; lun < 8; ++lun ) {
447 ta = &TagAlloc[target][lun];
448 memset( &ta->allocated, 0, MAX_TAGS/8 );
449 ta->nr_allocated = 0;
450 }
451 }
452 }
453
454 #endif /* SUPPORT_TAGS */
455
456
457 /*
458 * Function: void merge_contiguous_buffers( Scsi_Cmnd *cmd )
459 *
460 * Purpose: Try to merge several scatter-gather requests into one DMA
461 * transfer. This is possible if the scatter buffers lie on
462 * physical contiguous addresses.
463 *
464 * Parameters: Scsi_Cmnd *cmd
465 * The command to work on. The first scatter buffer's data are
466 * assumed to be already transfered into ptr/this_residual.
467 */
468
469 static void merge_contiguous_buffers( Scsi_Cmnd *cmd )
470 {
471 unsigned long endaddr;
472 #if (NDEBUG & NDEBUG_MERGING)
473 unsigned long oldlen = cmd->SCp.this_residual;
474 int cnt = 1;
475 #endif
476
477 for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1;
478 cmd->SCp.buffers_residual &&
479 virt_to_phys(cmd->SCp.buffer[1].address) == endaddr; ) {
480
481 MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
482 cmd->SCp.buffer[1].address, endaddr);
483 #if (NDEBUG & NDEBUG_MERGING)
484 ++cnt;
485 #endif
486 ++cmd->SCp.buffer;
487 --cmd->SCp.buffers_residual;
488 cmd->SCp.this_residual += cmd->SCp.buffer->length;
489 endaddr += cmd->SCp.buffer->length;
490 }
491 #if (NDEBUG & NDEBUG_MERGING)
492 if (oldlen != cmd->SCp.this_residual)
493 MER_PRINTK("merged %d buffers from %p, new length %08x\n",
494 cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
495 #endif
496 }
497
498 /*
499 * Function : void initialize_SCp(Scsi_Cmnd *cmd)
500 *
501 * Purpose : initialize the saved data pointers for cmd to point to the
502 * start of the buffer.
503 *
504 * Inputs : cmd - Scsi_Cmnd structure to have pointers reset.
505 */
506
507 static __inline__ void initialize_SCp(Scsi_Cmnd *cmd)
508 {
509 /*
510 * Initialize the Scsi Pointer field so that all of the commands in the
511 * various queues are valid.
512 */
513
514 if (cmd->use_sg) {
515 cmd->SCp.buffer = (struct scatterlist *) cmd->buffer;
516 cmd->SCp.buffers_residual = cmd->use_sg - 1;
517 cmd->SCp.ptr = (char *) cmd->SCp.buffer->address;
518 cmd->SCp.this_residual = cmd->SCp.buffer->length;
519 /* ++roman: Try to merge some scatter-buffers if they are at
520 * contiguous physical addresses.
521 */
522 merge_contiguous_buffers( cmd );
523 } else {
524 cmd->SCp.buffer = NULL;
525 cmd->SCp.buffers_residual = 0;
526 cmd->SCp.ptr = (char *) cmd->request_buffer;
527 cmd->SCp.this_residual = cmd->request_bufflen;
528 }
529
530 }
531
532 #include <linux/config.h>
533 #include <linux/delay.h>
534
535 #if 1
536 static struct {
537 unsigned char mask;
538 const char * name;}
539 signals[] = {{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" },
540 { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" },
541 { SR_SEL, "SEL" }, {0, NULL}},
542 basrs[] = {{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}},
543 icrs[] = {{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
544 {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"},
545 {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"},
546 {0, NULL}},
547 mrs[] = {{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"},
548 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR,
549 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"},
550 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
551 {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"},
552 {0, NULL}};
553
554 /*
555 * Function : void NCR5380_print(struct Scsi_Host *instance)
556 *
557 * Purpose : print the SCSI bus signals for debugging purposes
558 *
559 * Input : instance - which NCR5380
560 */
561
562 static void NCR5380_print(struct Scsi_Host *instance) {
563 unsigned char status, data, basr, mr, icr, i;
564 unsigned long flags;
565
566 save_flags(flags);
567 cli();
568 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
569 status = NCR5380_read(STATUS_REG);
570 mr = NCR5380_read(MODE_REG);
571 icr = NCR5380_read(INITIATOR_COMMAND_REG);
572 basr = NCR5380_read(BUS_AND_STATUS_REG);
573 restore_flags(flags);
574 printk("STATUS_REG: %02x ", status);
575 for (i = 0; signals[i].mask ; ++i)
576 if (status & signals[i].mask)
577 printk(",%s", signals[i].name);
578 printk("\nBASR: %02x ", basr);
579 for (i = 0; basrs[i].mask ; ++i)
580 if (basr & basrs[i].mask)
581 printk(",%s", basrs[i].name);
582 printk("\nICR: %02x ", icr);
583 for (i = 0; icrs[i].mask; ++i)
584 if (icr & icrs[i].mask)
585 printk(",%s", icrs[i].name);
586 printk("\nMODE: %02x ", mr);
587 for (i = 0; mrs[i].mask; ++i)
588 if (mr & mrs[i].mask)
589 printk(",%s", mrs[i].name);
590 printk("\n");
591 }
592
593 static struct {
594 unsigned char value;
595 const char *name;
596 } phases[] = {
597 {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
598 {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
599 {PHASE_UNKNOWN, "UNKNOWN"}};
600
601 /*
602 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
603 *
604 * Purpose : print the current SCSI phase for debugging purposes
605 *
606 * Input : instance - which NCR5380
607 */
608
609 static void NCR5380_print_phase(struct Scsi_Host *instance)
610 {
611 unsigned char status;
612 int i;
613
614 status = NCR5380_read(STATUS_REG);
615 if (!(status & SR_REQ))
616 printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
617 else {
618 for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
619 (phases[i].value != (status & PHASE_MASK)); ++i);
620 printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name);
621 }
622 }
623
624 #else /* !NDEBUG */
625
626 /* dummies... */
627 __inline__ void NCR5380_print(struct Scsi_Host *instance) { };
628 __inline__ void NCR5380_print_phase(struct Scsi_Host *instance) { };
629
630 #endif
631
632 /*
633 * ++roman: New scheme of calling NCR5380_main()
634 *
635 * If we're not in an interrupt, we can call our main directly, it cannot be
636 * already running. Else, we queue it on a task queue, if not 'main_running'
637 * tells us that a lower level is already executing it. This way,
638 * 'main_running' needs not be protected in a special way.
639 *
640 * queue_main() is a utility function for putting our main onto the task
641 * queue, if main_running is false. It should be called only from a
642 * interrupt or bottom half.
643 */
644
645 #include <linux/tqueue.h>
646 #include <linux/interrupt.h>
647
648 static volatile int main_running = 0;
649 static struct tq_struct NCR5380_tqueue = {
650 NULL, /* next */
651 0, /* sync */
652 (void (*)(void*))NCR5380_main, /* routine, must have (void *) arg... */
653 NULL /* data */
654 };
655
656 static __inline__ void queue_main(void)
657 {
658 if (!main_running) {
659 /* If in interrupt and NCR5380_main() not already running,
660 queue it on the 'immediate' task queue, to be processed
661 immediately after the current interrupt processing has
662 finished. */
663 queue_task(&NCR5380_tqueue, &tq_immediate);
664 mark_bh(IMMEDIATE_BH);
665 }
666 /* else: nothing to do: the running NCR5380_main() will pick up
667 any newly queued command. */
668 }
669
670
671 static inline void NCR5380_all_init (void)
672 {
673 static int done = 0;
674 if (!done) {
675 INI_PRINTK("scsi : NCR5380_all_init()\n");
676 done = 1;
677 }
678 }
679
680
681 /*
682 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
683 *
684 * Purpose : called by probe code indicating the NCR5380 driver
685 * options that were selected.
686 *
687 * Inputs : instance, pointer to this instance. Unused.
688 */
689
690 static void __init NCR5380_print_options (struct Scsi_Host *instance)
691 {
692 printk(" generic options"
693 #ifdef AUTOSENSE
694 " AUTOSENSE"
695 #endif
696 #ifdef REAL_DMA
697 " REAL DMA"
698 #endif
699 #ifdef PARITY
700 " PARITY"
701 #endif
702 #ifdef SUPPORT_TAGS
703 " SCSI-2 TAGGED QUEUING"
704 #endif
705 );
706 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
707 }
708
709 /*
710 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
711 *
712 * Purpose : print commands in the various queues, called from
713 * NCR5380_abort and NCR5380_debug to aid debugging.
714 *
715 * Inputs : instance, pointer to this instance.
716 */
717
718 static void NCR5380_print_status (struct Scsi_Host *instance)
719 {
720 char *pr_bfr;
721 char *start;
722 int len;
723
724 NCR_PRINT(NDEBUG_ANY);
725 NCR_PRINT_PHASE(NDEBUG_ANY);
726
727 pr_bfr = (char *) __get_free_page(GFP_ATOMIC);
728 if (!pr_bfr) {
729 printk("NCR5380_print_status: no memory for print buffer\n");
730 return;
731 }
732 len = NCR5380_proc_info(pr_bfr, &start, 0, PAGE_SIZE, HOSTNO, 0);
733 pr_bfr[len] = 0;
734 printk("\n%s\n", pr_bfr);
735 free_page((unsigned long) pr_bfr);
736 }
737
738
739 /******************************************/
740 /*
741 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
742 *
743 * *buffer: I/O buffer
744 * **start: if inout == FALSE pointer into buffer where user read should start
745 * offset: current offset
746 * length: length of buffer
747 * hostno: Scsi_Host host_no
748 * inout: TRUE - user is writing; FALSE - user is reading
749 *
750 * Return the number of bytes read from or written
751 */
752
753 #undef SPRINTF
754 #define SPRINTF(fmt,args...) \
755 do { if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \
756 pos += sprintf(pos, fmt , ## args); } while(0)
757 static
758 char *lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length);
759
760 #ifndef NCR5380_proc_info
761 static
762 #endif
763 int NCR5380_proc_info (char *buffer, char **start, off_t offset,
764 int length, int hostno, int inout)
765 {
766 char *pos = buffer;
767 struct Scsi_Host *instance;
768 struct NCR5380_hostdata *hostdata;
769 Scsi_Cmnd *ptr;
770 unsigned long flags;
771 off_t begin = 0;
772 #define check_offset() \
773 do { \
774 if (pos - buffer < offset - begin) { \
775 begin += pos - buffer; \
776 pos = buffer; \
777 } \
778 } while (0)
779
780 for (instance = first_instance; instance && HOSTNO != hostno;
781 instance = instance->next)
782 ;
783 if (!instance)
784 return(-ESRCH);
785 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
786
787 if (inout) { /* Has data been written to the file ? */
788 return(-ENOSYS); /* Currently this is a no-op */
789 }
790 SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
791 check_offset();
792 save_flags(flags);
793 cli();
794 SPRINTF("NCR5380: coroutine is%s running.\n", main_running ? "" : "n't");
795 check_offset();
796 if (!hostdata->connected)
797 SPRINTF("scsi%d: no currently connected command\n", HOSTNO);
798 else
799 pos = lprint_Scsi_Cmnd ((Scsi_Cmnd *) hostdata->connected,
800 pos, buffer, length);
801 SPRINTF("scsi%d: issue_queue\n", HOSTNO);
802 check_offset();
803 for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = NEXT(ptr)) {
804 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
805 check_offset();
806 }
807
808 SPRINTF("scsi%d: disconnected_queue\n", HOSTNO);
809 check_offset();
810 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
811 ptr = NEXT(ptr)) {
812 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
813 check_offset();
814 }
815
816 restore_flags(flags);
817 *start = buffer + (offset - begin);
818 if (pos - buffer < offset - begin)
819 return 0;
820 else if (pos - buffer - (offset - begin) < length)
821 return pos - buffer - (offset - begin);
822 return length;
823 }
824
825 static char *
826 lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length)
827 {
828 int i, s;
829 unsigned char *command;
830 SPRINTF("scsi%d: destination target %d, lun %d\n",
831 H_NO(cmd), cmd->target, cmd->lun);
832 SPRINTF(" command = ");
833 command = cmd->cmnd;
834 SPRINTF("%2d (0x%02x)", command[0], command[0]);
835 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
836 SPRINTF(" %02x", command[i]);
837 SPRINTF("\n");
838 return pos;
839 }
840
841
842 /*
843 * Function : void NCR5380_init (struct Scsi_Host *instance)
844 *
845 * Purpose : initializes *instance and corresponding 5380 chip.
846 *
847 * Inputs : instance - instantiation of the 5380 driver.
848 *
849 * Notes : I assume that the host, hostno, and id bits have been
850 * set correctly. I don't care about the irq and other fields.
851 *
852 */
853
854 static void __init NCR5380_init (struct Scsi_Host *instance, int flags)
855 {
856 int i;
857 SETUP_HOSTDATA(instance);
858
859 NCR5380_all_init();
860
861 hostdata->aborted = 0;
862 hostdata->id_mask = 1 << instance->this_id;
863 hostdata->id_higher_mask = 0;
864 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
865 if (i > hostdata->id_mask)
866 hostdata->id_higher_mask |= i;
867 for (i = 0; i < 8; ++i)
868 hostdata->busy[i] = 0;
869 #ifdef SUPPORT_TAGS
870 init_tags();
871 #endif
872 #if defined (REAL_DMA)
873 hostdata->dma_len = 0;
874 #endif
875 hostdata->targets_present = 0;
876 hostdata->connected = NULL;
877 hostdata->issue_queue = NULL;
878 hostdata->disconnected_queue = NULL;
879 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
880
881 if (!the_template) {
882 the_template = instance->hostt;
883 first_instance = instance;
884 }
885
886
887 #ifndef AUTOSENSE
888 if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1))
889 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
890 " without AUTOSENSE option, contingent allegiance conditions may\n"
891 " be incorrectly cleared.\n", HOSTNO);
892 #endif /* def AUTOSENSE */
893
894 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
895 NCR5380_write(MODE_REG, MR_BASE);
896 NCR5380_write(TARGET_COMMAND_REG, 0);
897 NCR5380_write(SELECT_ENABLE_REG, 0);
898 }
899
900 /*
901 * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd,
902 * void (*done)(Scsi_Cmnd *))
903 *
904 * Purpose : enqueues a SCSI command
905 *
906 * Inputs : cmd - SCSI command, done - function called on completion, with
907 * a pointer to the command descriptor.
908 *
909 * Returns : 0
910 *
911 * Side effects :
912 * cmd is added to the per instance issue_queue, with minor
913 * twiddling done to the host specific fields of cmd. If the
914 * main coroutine is not running, it is restarted.
915 *
916 */
917
918 /* Only make static if a wrapper function is used */
919 #ifndef NCR5380_queue_command
920 static
921 #endif
922 int NCR5380_queue_command (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
923 {
924 SETUP_HOSTDATA(cmd->host);
925 Scsi_Cmnd *tmp;
926 unsigned long flags;
927 extern int update_timeout(Scsi_Cmnd * SCset, int timeout);
928
929 #if (NDEBUG & NDEBUG_NO_WRITE)
930 switch (cmd->cmnd[0]) {
931 case WRITE_6:
932 case WRITE_10:
933 printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
934 H_NO(cmd));
935 cmd->result = (DID_ERROR << 16);
936 done(cmd);
937 return 0;
938 }
939 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
940
941
942 #ifdef NCR5380_STATS
943 # if 0
944 if (!hostdata->connected && !hostdata->issue_queue &&
945 !hostdata->disconnected_queue) {
946 hostdata->timebase = jiffies;
947 }
948 # endif
949 # ifdef NCR5380_STAT_LIMIT
950 if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
951 # endif
952 switch (cmd->cmnd[0])
953 {
954 case WRITE:
955 case WRITE_6:
956 case WRITE_10:
957 hostdata->time_write[cmd->target] -= (jiffies - hostdata->timebase);
958 hostdata->bytes_write[cmd->target] += cmd->request_bufflen;
959 hostdata->pendingw++;
960 break;
961 case READ:
962 case READ_6:
963 case READ_10:
964 hostdata->time_read[cmd->target] -= (jiffies - hostdata->timebase);
965 hostdata->bytes_read[cmd->target] += cmd->request_bufflen;
966 hostdata->pendingr++;
967 break;
968 }
969 #endif
970
971 /*
972 * We use the host_scribble field as a pointer to the next command
973 * in a queue
974 */
975
976 NEXT(cmd) = NULL;
977 cmd->scsi_done = done;
978
979 cmd->result = 0;
980
981
982 /*
983 * Insert the cmd into the issue queue. Note that REQUEST SENSE
984 * commands are added to the head of the queue since any command will
985 * clear the contingent allegiance condition that exists and the
986 * sense data is only guaranteed to be valid while the condition exists.
987 */
988
989 save_flags(flags);
990 cli();
991 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
992 * Otherwise a running NCR5380_main may steal the lock.
993 * Lock before actually inserting due to fairness reasons explained in
994 * atari_scsi.c. If we insert first, then it's impossible for this driver
995 * to release the lock.
996 * Stop timer for this command while waiting for the lock, or timeouts
997 * may happen (and they really do), and it's no good if the command doesn't
998 * appear in any of the queues.
999 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1000 * because also a timer int can trigger an abort or reset, which would
1001 * alter queues and touch the lock.
1002 */
1003 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
1004 LIST(cmd, hostdata->issue_queue);
1005 NEXT(cmd) = hostdata->issue_queue;
1006 hostdata->issue_queue = cmd;
1007 } else {
1008 for (tmp = (Scsi_Cmnd *)hostdata->issue_queue;
1009 NEXT(tmp); tmp = NEXT(tmp))
1010 ;
1011 LIST(cmd, tmp);
1012 NEXT(tmp) = cmd;
1013 }
1014
1015 restore_flags(flags);
1016
1017 QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd),
1018 (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
1019
1020 /* If queue_command() is called from an interrupt (real one or bottom
1021 * half), we let queue_main() do the job of taking care about main. If it
1022 * is already running, this is a no-op, else main will be queued.
1023 *
1024 * If we're not in an interrupt, we can call NCR5380_main()
1025 * unconditionally, because it cannot be already running.
1026 */
1027 if (in_interrupt() || ((flags >> 8) & 7) >= 6)
1028 queue_main();
1029 else
1030 NCR5380_main();
1031 return 0;
1032 }
1033
1034 /*
1035 * Function : NCR5380_main (void)
1036 *
1037 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1038 * be done on the NCR5380 host adapters in a system. Both
1039 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1040 * in case it is not running.
1041 *
1042 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
1043 * reenable them. This prevents reentrancy and kernel stack overflow.
1044 */
1045
1046 static void NCR5380_main (void)
1047 {
1048 Scsi_Cmnd *tmp, *prev;
1049 struct Scsi_Host *instance = first_instance;
1050 struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
1051 int done;
1052 unsigned long flags;
1053
1054 /*
1055 * We run (with interrupts disabled) until we're sure that none of
1056 * the host adapters have anything that can be done, at which point
1057 * we set main_running to 0 and exit.
1058 *
1059 * Interrupts are enabled before doing various other internal
1060 * instructions, after we've decided that we need to run through
1061 * the loop again.
1062 *
1063 * this should prevent any race conditions.
1064 *
1065 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1066 * because also a timer int can trigger an abort or reset, which can
1067 * alter queues and touch the Falcon lock.
1068 */
1069
1070 /* Tell int handlers main() is now already executing. Note that
1071 no races are possible here. If an int comes in before
1072 'main_running' is set here, and queues/executes main via the
1073 task queue, it doesn't do any harm, just this instance of main
1074 won't find any work left to do. */
1075 if (main_running)
1076 return;
1077 main_running = 1;
1078
1079 save_flags(flags);
1080 do {
1081 cli(); /* Freeze request queues */
1082 done = 1;
1083
1084 if (!hostdata->connected) {
1085 MAIN_PRINTK( "scsi%d: not connected\n", HOSTNO );
1086 /*
1087 * Search through the issue_queue for a command destined
1088 * for a target that's not busy.
1089 */
1090 #if (NDEBUG & NDEBUG_LISTS)
1091 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL;
1092 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1093 ;
1094 if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/
1095 #endif
1096 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue,
1097 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) {
1098
1099 #if (NDEBUG & NDEBUG_LISTS)
1100 if (prev != tmp)
1101 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
1102 tmp, tmp->target, hostdata->busy[tmp->target],
1103 tmp->lun);
1104 #endif
1105 /* When we find one, remove it from the issue queue. */
1106 /* ++guenther: possible race with Falcon locking */
1107 if (
1108 #ifdef SUPPORT_TAGS
1109 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
1110 #else
1111 !(hostdata->busy[tmp->target] & (1 << tmp->lun))
1112 #endif
1113 ) {
1114 cli(); /* ++guenther: just to be sure, this must be atomic */
1115 if (prev) {
1116 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
1117 NEXT(prev) = NEXT(tmp);
1118 } else {
1119 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1120 hostdata->issue_queue = NEXT(tmp);
1121 }
1122 NEXT(tmp) = NULL;
1123
1124 /* reenable interrupts after finding one */
1125 restore_flags(flags);
1126
1127 /*
1128 * Attempt to establish an I_T_L nexus here.
1129 * On success, instance->hostdata->connected is set.
1130 * On failure, we must add the command back to the
1131 * issue queue so we can keep trying.
1132 */
1133 MAIN_PRINTK("scsi%d: main(): command for target %d "
1134 "lun %d removed from issue_queue\n",
1135 HOSTNO, tmp->target, tmp->lun);
1136 /*
1137 * REQUEST SENSE commands are issued without tagged
1138 * queueing, even on SCSI-II devices because the
1139 * contingent allegiance condition exists for the
1140 * entire unit.
1141 */
1142 /* ++roman: ...and the standard also requires that
1143 * REQUEST SENSE command are untagged.
1144 */
1145
1146 #ifdef SUPPORT_TAGS
1147 cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE );
1148 #endif
1149 if (!NCR5380_select(instance, tmp,
1150 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
1151 TAG_NEXT)) {
1152 break;
1153 } else {
1154 cli();
1155 LIST(tmp, hostdata->issue_queue);
1156 NEXT(tmp) = hostdata->issue_queue;
1157 hostdata->issue_queue = tmp;
1158 #ifdef SUPPORT_TAGS
1159 cmd_free_tag( tmp );
1160 #endif
1161 restore_flags(flags);
1162 MAIN_PRINTK("scsi%d: main(): select() failed, "
1163 "returned to issue_queue\n", HOSTNO);
1164 if (hostdata->connected)
1165 break;
1166 }
1167 } /* if target/lun/target queue is not busy */
1168 } /* for issue_queue */
1169 } /* if (!hostdata->connected) */
1170 if (hostdata->connected
1171 #ifdef REAL_DMA
1172 && !hostdata->dma_len
1173 #endif
1174 ) {
1175 restore_flags(flags);
1176 MAIN_PRINTK("scsi%d: main: performing information transfer\n",
1177 HOSTNO);
1178 NCR5380_information_transfer(instance);
1179 MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
1180 done = 0;
1181 }
1182 } while (!done);
1183
1184 /* Better allow ints _after_ 'main_running' has been cleared, else
1185 an interrupt could believe we'll pick up the work it left for
1186 us, but we won't see it anymore here... */
1187 main_running = 0;
1188 restore_flags(flags);
1189 }
1190
1191
1192 #ifdef REAL_DMA
1193 /*
1194 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1195 *
1196 * Purpose : Called by interrupt handler when DMA finishes or a phase
1197 * mismatch occurs (which would finish the DMA transfer).
1198 *
1199 * Inputs : instance - this instance of the NCR5380.
1200 *
1201 */
1202
1203 static void NCR5380_dma_complete( struct Scsi_Host *instance )
1204 {
1205 SETUP_HOSTDATA(instance);
1206 int transfered;
1207 unsigned char **data;
1208 volatile int *count;
1209
1210 if (!hostdata->connected) {
1211 printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
1212 "no connected cmd\n", HOSTNO);
1213 return;
1214 }
1215
1216 DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1217 HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
1218 NCR5380_read(STATUS_REG));
1219
1220 if((sun3scsi_dma_finish())) {
1221 printk("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", HOSTNO);
1222 printk("please e-mail sammy@oh.verio.com with a description of how this\n");
1223 printk("error was produced.\n");
1224 machine_halt();
1225 }
1226
1227 /* make sure we're not stuck in a data phase */
1228 if((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH |
1229 BASR_ACK)) ==
1230 (BASR_PHASE_MATCH | BASR_ACK)) {
1231 printk("scsi%d: BASR %02x\n", HOSTNO, NCR5380_read(BUS_AND_STATUS_REG));
1232 printk("scsi%d: bus stuck in data phase -- probably a
1233 single byte overrun!\n", HOSTNO);
1234 printk("not prepared for this error!\n");
1235 printk("please e-mail sammy@oh.verio.com with a description of how this\n");
1236 printk("error was produced.\n");
1237 machine_halt();
1238 }
1239
1240
1241
1242 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1243 NCR5380_write(MODE_REG, MR_BASE);
1244 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1245
1246 transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
1247 hostdata->dma_len = 0;
1248
1249 data = (unsigned char **) &(hostdata->connected->SCp.ptr);
1250 count = &(hostdata->connected->SCp.this_residual);
1251 *data += transfered;
1252 *count -= transfered;
1253
1254 }
1255 #endif /* REAL_DMA */
1256
1257
1258 /*
1259 * Function : void NCR5380_intr (int irq)
1260 *
1261 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1262 * from the disconnected queue, and restarting NCR5380_main()
1263 * as required.
1264 *
1265 * Inputs : int irq, irq that caused this interrupt.
1266 *
1267 */
1268
1269 static void NCR5380_intr (int irq, void *dev_id, struct pt_regs *regs)
1270 {
1271 struct Scsi_Host *instance = first_instance;
1272 int done = 1;
1273 unsigned char basr;
1274
1275 INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
1276
1277 /* Look for pending interrupts */
1278 basr = NCR5380_read(BUS_AND_STATUS_REG);
1279 INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
1280 /* dispatch to appropriate routine if found and done=0 */
1281 if (basr & BASR_IRQ) {
1282 NCR_PRINT(NDEBUG_INTR);
1283 if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
1284 done = 0;
1285 ENABLE_IRQ();
1286 INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
1287 NCR5380_reselect(instance);
1288 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1289 }
1290 else if (basr & BASR_PARITY_ERROR) {
1291 INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
1292 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1293 }
1294 else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1295 INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
1296 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1297 }
1298 else {
1299 /*
1300 * The rest of the interrupt conditions can occur only during a
1301 * DMA transfer
1302 */
1303
1304 #if defined(REAL_DMA)
1305 /*
1306 * We should only get PHASE MISMATCH and EOP interrupts if we have
1307 * DMA enabled, so do a sanity check based on the current setting
1308 * of the MODE register.
1309 */
1310
1311 if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
1312 ((basr & BASR_END_DMA_TRANSFER) ||
1313 !(basr & BASR_PHASE_MATCH))) {
1314
1315 INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
1316 NCR5380_dma_complete( instance );
1317 done = 0;
1318 ENABLE_IRQ();
1319 } else
1320 #endif /* REAL_DMA */
1321 {
1322 /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1323 if (basr & BASR_PHASE_MATCH)
1324 printk(KERN_NOTICE "scsi%d: unknown interrupt, "
1325 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1326 HOSTNO, basr, NCR5380_read(MODE_REG),
1327 NCR5380_read(STATUS_REG));
1328 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1329 }
1330 } /* if !(SELECTION || PARITY) */
1331 } /* BASR & IRQ */
1332 else {
1333
1334 printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
1335 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
1336 NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
1337 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1338 }
1339
1340 if (!done) {
1341 INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
1342 /* Put a call to NCR5380_main() on the queue... */
1343 queue_main();
1344 }
1345 }
1346
1347 #ifdef NCR5380_STATS
1348 static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd* cmd)
1349 {
1350 # ifdef NCR5380_STAT_LIMIT
1351 if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
1352 # endif
1353 switch (cmd->cmnd[0])
1354 {
1355 case WRITE:
1356 case WRITE_6:
1357 case WRITE_10:
1358 hostdata->time_write[cmd->target] += (jiffies - hostdata->timebase);
1359 /*hostdata->bytes_write[cmd->target] += cmd->request_bufflen;*/
1360 hostdata->pendingw--;
1361 break;
1362 case READ:
1363 case READ_6:
1364 case READ_10:
1365 hostdata->time_read[cmd->target] += (jiffies - hostdata->timebase);
1366 /*hostdata->bytes_read[cmd->target] += cmd->request_bufflen;*/
1367 hostdata->pendingr--;
1368 break;
1369 }
1370 }
1371 #endif
1372
1373 /*
1374 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
1375 * int tag);
1376 *
1377 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1378 * including ARBITRATION, SELECTION, and initial message out for
1379 * IDENTIFY and queue messages.
1380 *
1381 * Inputs : instance - instantiation of the 5380 driver on which this
1382 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1383 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1384 * the command that is presently connected.
1385 *
1386 * Returns : -1 if selection could not execute for some reason,
1387 * 0 if selection succeeded or failed because the target
1388 * did not respond.
1389 *
1390 * Side effects :
1391 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1392 * with registers as they should have been on entry - ie
1393 * SELECT_ENABLE will be set appropriately, the NCR5380
1394 * will cease to drive any SCSI bus signals.
1395 *
1396 * If successful : I_T_L or I_T_L_Q nexus will be established,
1397 * instance->connected will be set to cmd.
1398 * SELECT interrupt will be disabled.
1399 *
1400 * If failed (no target) : cmd->scsi_done() will be called, and the
1401 * cmd->result host byte set to DID_BAD_TARGET.
1402 */
1403
1404 static int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, int tag)
1405 {
1406 SETUP_HOSTDATA(instance);
1407 unsigned char tmp[3], phase;
1408 unsigned char *data;
1409 int len;
1410 unsigned long timeout;
1411 unsigned long flags;
1412
1413 hostdata->restart_select = 0;
1414 NCR_PRINT(NDEBUG_ARBITRATION);
1415 ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO,
1416 instance->this_id);
1417
1418 /*
1419 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1420 * data bus during SELECTION.
1421 */
1422
1423 save_flags(flags);
1424 cli();
1425 if (hostdata->connected) {
1426 restore_flags(flags);
1427 return -1;
1428 }
1429 NCR5380_write(TARGET_COMMAND_REG, 0);
1430
1431
1432 /*
1433 * Start arbitration.
1434 */
1435
1436 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1437 NCR5380_write(MODE_REG, MR_ARBITRATE);
1438
1439 restore_flags(flags);
1440
1441 /* Wait for arbitration logic to complete */
1442 #if NCR_TIMEOUT
1443 {
1444 unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
1445
1446 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1447 && time_before(jiffies, timeout) && !hostdata->connected)
1448 ;
1449 if (time_after_eq(jiffies, timeout))
1450 {
1451 printk("scsi : arbitration timeout at %d\n", __LINE__);
1452 NCR5380_write(MODE_REG, MR_BASE);
1453 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1454 return -1;
1455 }
1456 }
1457 #else /* NCR_TIMEOUT */
1458 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1459 && !hostdata->connected);
1460 #endif
1461
1462 ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
1463
1464 if (hostdata->connected) {
1465 NCR5380_write(MODE_REG, MR_BASE);
1466 return -1;
1467 }
1468 /*
1469 * The arbitration delay is 2.2us, but this is a minimum and there is
1470 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1471 * the integral nature of udelay().
1472 *
1473 */
1474
1475 udelay(3);
1476
1477 /* Check for lost arbitration */
1478 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1479 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1480 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1481 hostdata->connected) {
1482 NCR5380_write(MODE_REG, MR_BASE);
1483 ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1484 HOSTNO);
1485 return -1;
1486 }
1487
1488 /* after/during arbitration, BSY should be asserted.
1489 IBM DPES-31080 Version S31Q works now */
1490 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1491 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL |
1492 ICR_ASSERT_BSY ) ;
1493
1494 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1495 hostdata->connected) {
1496 NCR5380_write(MODE_REG, MR_BASE);
1497 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1498 ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1499 HOSTNO);
1500 return -1;
1501 }
1502
1503 /*
1504 * Again, bus clear + bus settle time is 1.2us, however, this is
1505 * a minimum so we'll udelay ceil(1.2)
1506 */
1507
1508 #ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1509 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1510 udelay(15);
1511 #else
1512 udelay(2);
1513 #endif
1514
1515 if (hostdata->connected) {
1516 NCR5380_write(MODE_REG, MR_BASE);
1517 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1518 return -1;
1519 }
1520
1521 ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
1522
1523 /*
1524 * Now that we have won arbitration, start Selection process, asserting
1525 * the host and target ID's on the SCSI bus.
1526 */
1527
1528 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->target)));
1529
1530 /*
1531 * Raise ATN while SEL is true before BSY goes false from arbitration,
1532 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1533 * phase immediately after selection.
1534 */
1535
1536 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
1537 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
1538 NCR5380_write(MODE_REG, MR_BASE);
1539
1540 /*
1541 * Reselect interrupts must be turned off prior to the dropping of BSY,
1542 * otherwise we will trigger an interrupt.
1543 */
1544
1545 if (hostdata->connected) {
1546 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1547 return -1;
1548 }
1549
1550 NCR5380_write(SELECT_ENABLE_REG, 0);
1551
1552 /*
1553 * The initiator shall then wait at least two deskew delays and release
1554 * the BSY signal.
1555 */
1556 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1557
1558 /* Reset BSY */
1559 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
1560 ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1561
1562 /*
1563 * Something weird happens when we cease to drive BSY - looks
1564 * like the board/chip is letting us do another read before the
1565 * appropriate propagation delay has expired, and we're confusing
1566 * a BSY signal from ourselves as the target's response to SELECTION.
1567 *
1568 * A small delay (the 'C++' frontend breaks the pipeline with an
1569 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1570 * tighter 'C' code breaks and requires this) solves the problem -
1571 * the 1 us delay is arbitrary, and only used because this delay will
1572 * be the same on other platforms and since it works here, it should
1573 * work there.
1574 *
1575 * wingel suggests that this could be due to failing to wait
1576 * one deskew delay.
1577 */
1578
1579 udelay(1);
1580
1581 SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->target);
1582
1583 /*
1584 * The SCSI specification calls for a 250 ms timeout for the actual
1585 * selection.
1586 */
1587
1588 timeout = jiffies + 25;
1589
1590 /*
1591 * XXX very interesting - we're seeing a bounce where the BSY we
1592 * asserted is being reflected / still asserted (propagation delay?)
1593 * and it's detecting as true. Sigh.
1594 */
1595
1596 #if 0
1597 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1598 * IO while SEL is true. But again, there are some disks out the in the
1599 * world that do that nevertheless. (Somebody claimed that this announces
1600 * reselection capability of the target.) So we better skip that test and
1601 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
1602 */
1603
1604 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) &
1605 (SR_BSY | SR_IO)));
1606
1607 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) ==
1608 (SR_SEL | SR_IO)) {
1609 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1610 NCR5380_reselect(instance);
1611 printk (KERN_ERR "scsi%d: reselection after won arbitration?\n",
1612 HOSTNO);
1613 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1614 return -1;
1615 }
1616 #else
1617 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY));
1618 #endif
1619
1620 /*
1621 * No less than two deskew delays after the initiator detects the
1622 * BSY signal is true, it shall release the SEL signal and may
1623 * change the DATA BUS. -wingel
1624 */
1625
1626 udelay(1);
1627
1628 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1629
1630 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1631 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1632 if (hostdata->targets_present & (1 << cmd->target)) {
1633 printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
1634 if (hostdata->restart_select)
1635 printk(KERN_NOTICE "\trestart select\n");
1636 NCR_PRINT(NDEBUG_ANY);
1637 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1638 return -1;
1639 }
1640 cmd->result = DID_BAD_TARGET << 16;
1641 #ifdef NCR5380_STATS
1642 collect_stats(hostdata, cmd);
1643 #endif
1644 #ifdef SUPPORT_TAGS
1645 cmd_free_tag( cmd );
1646 #endif
1647 cmd->scsi_done(cmd);
1648 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1649 SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
1650 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1651 return 0;
1652 }
1653
1654 hostdata->targets_present |= (1 << cmd->target);
1655
1656 /*
1657 * Since we followed the SCSI spec, and raised ATN while SEL
1658 * was true but before BSY was false during selection, the information
1659 * transfer phase should be a MESSAGE OUT phase so that we can send the
1660 * IDENTIFY message.
1661 *
1662 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1663 * message (2 bytes) with a tag ID that we increment with every command
1664 * until it wraps back to 0.
1665 *
1666 * XXX - it turns out that there are some broken SCSI-II devices,
1667 * which claim to support tagged queuing but fail when more than
1668 * some number of commands are issued at once.
1669 */
1670
1671 /* Wait for start of REQ/ACK handshake */
1672 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
1673
1674 SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1675 HOSTNO, cmd->target);
1676 tmp[0] = IDENTIFY(1, cmd->lun);
1677
1678 #ifdef SUPPORT_TAGS
1679 if (cmd->tag != TAG_NONE) {
1680 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1681 tmp[2] = cmd->tag;
1682 len = 3;
1683 } else
1684 len = 1;
1685 #else
1686 len = 1;
1687 cmd->tag=0;
1688 #endif /* SUPPORT_TAGS */
1689
1690 /* Send message(s) */
1691 data = tmp;
1692 phase = PHASE_MSGOUT;
1693 NCR5380_transfer_pio(instance, &phase, &len, &data);
1694 SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
1695 /* XXX need to handle errors here */
1696 hostdata->connected = cmd;
1697 #ifndef SUPPORT_TAGS
1698 hostdata->busy[cmd->target] |= (1 << cmd->lun);
1699 #endif
1700
1701 initialize_SCp(cmd);
1702
1703
1704 return 0;
1705 }
1706
1707 /*
1708 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1709 * unsigned char *phase, int *count, unsigned char **data)
1710 *
1711 * Purpose : transfers data in given phase using polled I/O
1712 *
1713 * Inputs : instance - instance of driver, *phase - pointer to
1714 * what phase is expected, *count - pointer to number of
1715 * bytes to transfer, **data - pointer to data pointer.
1716 *
1717 * Returns : -1 when different phase is entered without transferring
1718 * maximum number of bytes, 0 if all bytes are transfered or exit
1719 * is in same phase.
1720 *
1721 * Also, *phase, *count, *data are modified in place.
1722 *
1723 * XXX Note : handling for bus free may be useful.
1724 */
1725
1726 /*
1727 * Note : this code is not as quick as it could be, however it
1728 * IS 100% reliable, and for the actual data transfer where speed
1729 * counts, we will always do a pseudo DMA or DMA transfer.
1730 */
1731
1732 static int NCR5380_transfer_pio( struct Scsi_Host *instance,
1733 unsigned char *phase, int *count,
1734 unsigned char **data)
1735 {
1736 register unsigned char p = *phase, tmp;
1737 register int c = *count;
1738 register unsigned char *d = *data;
1739
1740 /*
1741 * The NCR5380 chip will only drive the SCSI bus when the
1742 * phase specified in the appropriate bits of the TARGET COMMAND
1743 * REGISTER match the STATUS REGISTER
1744 */
1745
1746 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1747
1748 do {
1749 /*
1750 * Wait for assertion of REQ, after which the phase bits will be
1751 * valid
1752 */
1753 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
1754
1755 HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
1756
1757 /* Check for phase mismatch */
1758 if ((tmp & PHASE_MASK) != p) {
1759 PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
1760 NCR_PRINT_PHASE(NDEBUG_PIO);
1761 break;
1762 }
1763
1764 /* Do actual transfer from SCSI bus to / from memory */
1765 if (!(p & SR_IO))
1766 NCR5380_write(OUTPUT_DATA_REG, *d);
1767 else
1768 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1769
1770 ++d;
1771
1772 /*
1773 * The SCSI standard suggests that in MSGOUT phase, the initiator
1774 * should drop ATN on the last byte of the message phase
1775 * after REQ has been asserted for the handshake but before
1776 * the initiator raises ACK.
1777 */
1778
1779 if (!(p & SR_IO)) {
1780 if (!((p & SR_MSG) && c > 1)) {
1781 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1782 ICR_ASSERT_DATA);
1783 NCR_PRINT(NDEBUG_PIO);
1784 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1785 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1786 } else {
1787 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1788 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1789 NCR_PRINT(NDEBUG_PIO);
1790 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1791 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1792 }
1793 } else {
1794 NCR_PRINT(NDEBUG_PIO);
1795 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1796 }
1797
1798 while (NCR5380_read(STATUS_REG) & SR_REQ);
1799
1800 HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
1801
1802 /*
1803 * We have several special cases to consider during REQ/ACK handshaking :
1804 * 1. We were in MSGOUT phase, and we are on the last byte of the
1805 * message. ATN must be dropped as ACK is dropped.
1806 *
1807 * 2. We are in a MSGIN phase, and we are on the last byte of the
1808 * message. We must exit with ACK asserted, so that the calling
1809 * code may raise ATN before dropping ACK to reject the message.
1810 *
1811 * 3. ACK and ATN are clear and the target may proceed as normal.
1812 */
1813 if (!(p == PHASE_MSGIN && c == 1)) {
1814 if (p == PHASE_MSGOUT && c > 1)
1815 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1816 else
1817 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1818 }
1819 } while (--c);
1820
1821 PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
1822
1823 *count = c;
1824 *data = d;
1825 tmp = NCR5380_read(STATUS_REG);
1826 /* The phase read from the bus is valid if either REQ is (already)
1827 * asserted or if ACK hasn't been released yet. The latter is the case if
1828 * we're in MSGIN and all wanted bytes have been received. */
1829 if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
1830 *phase = tmp & PHASE_MASK;
1831 else
1832 *phase = PHASE_UNKNOWN;
1833
1834 if (!c || (*phase == p))
1835 return 0;
1836 else
1837 return -1;
1838 }
1839
1840 /*
1841 * Function : do_abort (Scsi_Host *host)
1842 *
1843 * Purpose : abort the currently established nexus. Should only be
1844 * called from a routine which can drop into a
1845 *
1846 * Returns : 0 on success, -1 on failure.
1847 */
1848
1849 static int do_abort (struct Scsi_Host *host)
1850 {
1851 unsigned char tmp, *msgptr, phase;
1852 int len;
1853
1854 /* Request message out phase */
1855 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1856
1857 /*
1858 * Wait for the target to indicate a valid phase by asserting
1859 * REQ. Once this happens, we'll have either a MSGOUT phase
1860 * and can immediately send the ABORT message, or we'll have some
1861 * other phase and will have to source/sink data.
1862 *
1863 * We really don't care what value was on the bus or what value
1864 * the target sees, so we just handshake.
1865 */
1866
1867 while (!(tmp = NCR5380_read(STATUS_REG)) & SR_REQ);
1868
1869 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1870
1871 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1872 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1873 ICR_ASSERT_ACK);
1874 while (NCR5380_read(STATUS_REG) & SR_REQ);
1875 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1876 }
1877
1878 tmp = ABORT;
1879 msgptr = &tmp;
1880 len = 1;
1881 phase = PHASE_MSGOUT;
1882 NCR5380_transfer_pio (host, &phase, &len, &msgptr);
1883
1884 /*
1885 * If we got here, and the command completed successfully,
1886 * we're about to go into bus free state.
1887 */
1888
1889 return len ? -1 : 0;
1890 }
1891
1892 #if defined(REAL_DMA)
1893 /*
1894 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1895 * unsigned char *phase, int *count, unsigned char **data)
1896 *
1897 * Purpose : transfers data in given phase using either real
1898 * or pseudo DMA.
1899 *
1900 * Inputs : instance - instance of driver, *phase - pointer to
1901 * what phase is expected, *count - pointer to number of
1902 * bytes to transfer, **data - pointer to data pointer.
1903 *
1904 * Returns : -1 when different phase is entered without transferring
1905 * maximum number of bytes, 0 if all bytes or transfered or exit
1906 * is in same phase.
1907 *
1908 * Also, *phase, *count, *data are modified in place.
1909 *
1910 */
1911
1912
1913 static int NCR5380_transfer_dma( struct Scsi_Host *instance,
1914 unsigned char *phase, int *count,
1915 unsigned char **data)
1916 {
1917 SETUP_HOSTDATA(instance);
1918 register int c = *count;
1919 register unsigned char p = *phase;
1920 unsigned long flags;
1921
1922 /* sanity check */
1923 if(!sun3_dma_setup_done) {
1924 printk("scsi%d: transfer_dma without setup!\n", HOSTNO);
1925 machine_halt();
1926 }
1927
1928 hostdata->dma_len = c;
1929
1930 DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1931 HOSTNO, (p & SR_IO) ? "reading" : "writing",
1932 c, (p & SR_IO) ? "to" : "from", d);
1933
1934 /* netbsd turns off ints here, why not be safe and do it too */
1935 save_flags(flags);
1936 cli();
1937
1938 /* send start chain */
1939 sun3_udc_write(UDC_CHN_START, UDC_CSR);
1940
1941 if (p & SR_IO) {
1942 NCR5380_write(TARGET_COMMAND_REG, 1);
1943 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1944 NCR5380_write(INITIATOR_COMMAND_REG, 0);
1945 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1946 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1947 } else {
1948 NCR5380_write(TARGET_COMMAND_REG, 0);
1949 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1950 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA);
1951 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1952 NCR5380_write(START_DMA_SEND_REG, 0);
1953 }
1954
1955 restore_flags(flags);
1956
1957 sun3_dma_active = 1;
1958 return 0;
1959 }
1960 #endif /* defined(REAL_DMA) */
1961
1962 /*
1963 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1964 *
1965 * Purpose : run through the various SCSI phases and do as the target
1966 * directs us to. Operates on the currently connected command,
1967 * instance->connected.
1968 *
1969 * Inputs : instance, instance for which we are doing commands
1970 *
1971 * Side effects : SCSI things happen, the disconnected queue will be
1972 * modified if a command disconnects, *instance->connected will
1973 * change.
1974 *
1975 * XXX Note : we need to watch for bus free or a reset condition here
1976 * to recover from an unexpected bus free condition.
1977 */
1978
1979 static void NCR5380_information_transfer (struct Scsi_Host *instance)
1980 {
1981 SETUP_HOSTDATA(instance);
1982 unsigned long flags;
1983 unsigned char msgout = NOP;
1984 int sink = 0;
1985 int len;
1986 #if defined(REAL_DMA)
1987 int transfersize;
1988 #endif
1989 unsigned char *data;
1990 unsigned char phase, tmp, extended_msg[10], old_phase=0xff;
1991 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
1992
1993 while (1) {
1994 tmp = NCR5380_read(STATUS_REG);
1995 /* We only have a valid SCSI phase when REQ is asserted */
1996 if (tmp & SR_REQ) {
1997 phase = (tmp & PHASE_MASK);
1998 if (phase != old_phase) {
1999 old_phase = phase;
2000 NCR_PRINT_PHASE(NDEBUG_INFORMATION);
2001 }
2002
2003 if(phase == PHASE_CMDOUT) {
2004 void *d;
2005 unsigned long count;
2006
2007 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2008 count = cmd->SCp.buffer->length;
2009 d = cmd->SCp.buffer->address;
2010 } else {
2011 count = cmd->SCp.this_residual;
2012 d = cmd->SCp.ptr;
2013 }
2014 #ifdef REAL_DMA
2015 /* this command setup for dma yet? */
2016 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done
2017 != cmd))
2018 {
2019 if((cmd->request.cmd == 0) || (cmd->request.cmd == 1)) {
2020 sun3scsi_dma_setup(d, count,
2021 cmd->request.cmd);
2022 sun3_dma_setup_done = cmd;
2023 }
2024 }
2025 #endif
2026 }
2027
2028
2029 if (sink && (phase != PHASE_MSGOUT)) {
2030 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2031
2032 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
2033 ICR_ASSERT_ACK);
2034 while (NCR5380_read(STATUS_REG) & SR_REQ);
2035 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2036 ICR_ASSERT_ATN);
2037 sink = 0;
2038 continue;
2039 }
2040
2041 switch (phase) {
2042 case PHASE_DATAOUT:
2043 #if (NDEBUG & NDEBUG_NO_DATAOUT)
2044 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2045 "aborted\n", HOSTNO);
2046 sink = 1;
2047 do_abort(instance);
2048 cmd->result = DID_ERROR << 16;
2049 cmd->done(cmd);
2050 return;
2051 #endif
2052 case PHASE_DATAIN:
2053 /*
2054 * If there is no room left in the current buffer in the
2055 * scatter-gather list, move onto the next one.
2056 */
2057 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2058 ++cmd->SCp.buffer;
2059 --cmd->SCp.buffers_residual;
2060 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2061 cmd->SCp.ptr = cmd->SCp.buffer->address;
2062
2063 /* ++roman: Try to merge some scatter-buffers if
2064 * they are at contiguous physical addresses.
2065 */
2066 // merge_contiguous_buffers( cmd );
2067 INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
2068 HOSTNO, cmd->SCp.this_residual,
2069 cmd->SCp.buffers_residual);
2070 }
2071
2072 /*
2073 * The preferred transfer method is going to be
2074 * PSEUDO-DMA for systems that are strictly PIO,
2075 * since we can let the hardware do the handshaking.
2076 *
2077 * For this to work, we need to know the transfersize
2078 * ahead of time, since the pseudo-DMA code will sit
2079 * in an unconditional loop.
2080 */
2081
2082 /* ++roman: I suggest, this should be
2083 * #if def(REAL_DMA)
2084 * instead of leaving REAL_DMA out.
2085 */
2086
2087 #if defined(REAL_DMA)
2088 // if (!cmd->device->borken &&
2089 if((transfersize =
2090 NCR5380_dma_xfer_len(instance,cmd,phase)) > SUN3_DMA_MINSIZE) {
2091 len = transfersize;
2092 cmd->SCp.phase = phase;
2093
2094 if (NCR5380_transfer_dma(instance, &phase,
2095 &len, (unsigned char **) &cmd->SCp.ptr)) {
2096 /*
2097 * If the watchdog timer fires, all future
2098 * accesses to this device will use the
2099 * polled-IO. */
2100 printk(KERN_NOTICE "scsi%d: switching target %d "
2101 "lun %d to slow handshake\n", HOSTNO,
2102 cmd->target, cmd->lun);
2103 cmd->device->borken = 1;
2104 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2105 ICR_ASSERT_ATN);
2106 sink = 1;
2107 do_abort(instance);
2108 cmd->result = DID_ERROR << 16;
2109 cmd->done(cmd);
2110 /* XXX - need to source or sink data here, as appropriate */
2111 } else {
2112 #ifdef REAL_DMA
2113 /* ++roman: When using real DMA,
2114 * information_transfer() should return after
2115 * starting DMA since it has nothing more to
2116 * do.
2117 */
2118 return;
2119 #else
2120 cmd->SCp.this_residual -= transfersize - len;
2121 #endif
2122 }
2123 } else
2124 #endif /* defined(REAL_DMA) */
2125 NCR5380_transfer_pio(instance, &phase,
2126 (int *) &cmd->SCp.this_residual, (unsigned char **)
2127 &cmd->SCp.ptr);
2128 #ifdef REAL_DMA
2129 /* if we had intended to dma that command clear it */
2130 if(sun3_dma_setup_done == cmd)
2131 sun3_dma_setup_done = NULL;
2132 #endif
2133
2134 break;
2135 case PHASE_MSGIN:
2136 len = 1;
2137 data = &tmp;
2138 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
2139 NCR5380_transfer_pio(instance, &phase, &len, &data);
2140 cmd->SCp.Message = tmp;
2141
2142 switch (tmp) {
2143 /*
2144 * Linking lets us reduce the time required to get the
2145 * next command out to the device, hopefully this will
2146 * mean we don't waste another revolution due to the delays
2147 * required by ARBITRATION and another SELECTION.
2148 *
2149 * In the current implementation proposal, low level drivers
2150 * merely have to start the next command, pointed to by
2151 * next_link, done() is called as with unlinked commands.
2152 */
2153 #ifdef LINKED
2154 case LINKED_CMD_COMPLETE:
2155 case LINKED_FLG_CMD_COMPLETE:
2156 /* Accept message by clearing ACK */
2157 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2158
2159 LNK_PRINTK("scsi%d: target %d lun %d linked command "
2160 "complete.\n", HOSTNO, cmd->target, cmd->lun);
2161
2162 /* Enable reselect interrupts */
2163 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2164 /*
2165 * Sanity check : A linked command should only terminate
2166 * with one of these messages if there are more linked
2167 * commands available.
2168 */
2169
2170 if (!cmd->next_link) {
2171 printk(KERN_NOTICE "scsi%d: target %d lun %d "
2172 "linked command complete, no next_link\n",
2173 HOSTNO, cmd->target, cmd->lun);
2174 sink = 1;
2175 do_abort (instance);
2176 return;
2177 }
2178
2179 initialize_SCp(cmd->next_link);
2180 /* The next command is still part of this process; copy it
2181 * and don't free it! */
2182 cmd->next_link->tag = cmd->tag;
2183 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2184 LNK_PRINTK("scsi%d: target %d lun %d linked request "
2185 "done, calling scsi_done().\n",
2186 HOSTNO, cmd->target, cmd->lun);
2187 #ifdef NCR5380_STATS
2188 collect_stats(hostdata, cmd);
2189 #endif
2190 cmd->scsi_done(cmd);
2191 cmd = hostdata->connected;
2192 break;
2193 #endif /* def LINKED */
2194 case ABORT:
2195 case COMMAND_COMPLETE:
2196 /* Accept message by clearing ACK */
2197 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2198 hostdata->connected = NULL;
2199 QU_PRINTK("scsi%d: command for target %d, lun %d "
2200 "completed\n", HOSTNO, cmd->target, cmd->lun);
2201 #ifdef SUPPORT_TAGS
2202 cmd_free_tag( cmd );
2203 if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
2204 /* Turn a QUEUE FULL status into BUSY, I think the
2205 * mid level cannot handle QUEUE FULL :-( (The
2206 * command is retried after BUSY). Also update our
2207 * queue size to the number of currently issued
2208 * commands now.
2209 */
2210 /* ++Andreas: the mid level code knows about
2211 QUEUE_FULL now. */
2212 TAG_ALLOC *ta = &TagAlloc[cmd->target][cmd->lun];
2213 TAG_PRINTK("scsi%d: target %d lun %d returned "
2214 "QUEUE_FULL after %d commands\n",
2215 HOSTNO, cmd->target, cmd->lun,
2216 ta->nr_allocated);
2217 if (ta->queue_size > ta->nr_allocated)
2218 ta->nr_allocated = ta->queue_size;
2219 }
2220 #else
2221 hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
2222 #endif
2223 /* Enable reselect interrupts */
2224 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2225
2226 /*
2227 * I'm not sure what the correct thing to do here is :
2228 *
2229 * If the command that just executed is NOT a request
2230 * sense, the obvious thing to do is to set the result
2231 * code to the values of the stored parameters.
2232 *
2233 * If it was a REQUEST SENSE command, we need some way to
2234 * differentiate between the failure code of the original
2235 * and the failure code of the REQUEST sense - the obvious
2236 * case is success, where we fall through and leave the
2237 * result code unchanged.
2238 *
2239 * The non-obvious place is where the REQUEST SENSE failed
2240 */
2241
2242 if (cmd->cmnd[0] != REQUEST_SENSE)
2243 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2244 else if (status_byte(cmd->SCp.Status) != GOOD)
2245 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2246
2247 #ifdef AUTOSENSE
2248 if ((cmd->cmnd[0] != REQUEST_SENSE) &&
2249 (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2250 ASEN_PRINTK("scsi%d: performing request sense\n",
2251 HOSTNO);
2252 cmd->cmnd[0] = REQUEST_SENSE;
2253 cmd->cmnd[1] &= 0xe0;
2254 cmd->cmnd[2] = 0;
2255 cmd->cmnd[3] = 0;
2256 cmd->cmnd[4] = sizeof(cmd->sense_buffer);
2257 cmd->cmnd[5] = 0;
2258 cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]);
2259
2260 cmd->use_sg = 0;
2261 /* this is initialized from initialize_SCp
2262 cmd->SCp.buffer = NULL;
2263 cmd->SCp.buffers_residual = 0;
2264 */
2265 cmd->request_buffer = (char *) cmd->sense_buffer;
2266 cmd->request_bufflen = sizeof(cmd->sense_buffer);
2267
2268 save_flags(flags);
2269 cli();
2270 LIST(cmd,hostdata->issue_queue);
2271 NEXT(cmd) = hostdata->issue_queue;
2272 hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2273 restore_flags(flags);
2274 QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
2275 "issue queue\n", H_NO(cmd));
2276 } else
2277 #endif /* def AUTOSENSE */
2278 {
2279 #ifdef NCR5380_STATS
2280 collect_stats(hostdata, cmd);
2281 #endif
2282 cmd->scsi_done(cmd);
2283 }
2284
2285 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2286 /*
2287 * Restore phase bits to 0 so an interrupted selection,
2288 * arbitration can resume.
2289 */
2290 NCR5380_write(TARGET_COMMAND_REG, 0);
2291
2292 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2293 barrier();
2294
2295 return;
2296 case MESSAGE_REJECT:
2297 /* Accept message by clearing ACK */
2298 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2299 /* Enable reselect interrupts */
2300 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2301 switch (hostdata->last_message) {
2302 case HEAD_OF_QUEUE_TAG:
2303 case ORDERED_QUEUE_TAG:
2304 case SIMPLE_QUEUE_TAG:
2305 /* The target obviously doesn't support tagged
2306 * queuing, even though it announced this ability in
2307 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2308 * clear 'tagged_supported' and lock the LUN, since
2309 * the command is treated as untagged further on.
2310 */
2311 cmd->device->tagged_supported = 0;
2312 hostdata->busy[cmd->target] |= (1 << cmd->lun);
2313 cmd->tag = TAG_NONE;
2314 TAG_PRINTK("scsi%d: target %d lun %d rejected "
2315 "QUEUE_TAG message; tagged queuing "
2316 "disabled\n",
2317 HOSTNO, cmd->target, cmd->lun);
2318 break;
2319 }
2320 break;
2321 case DISCONNECT:
2322 /* Accept message by clearing ACK */
2323 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2324 save_flags(flags);
2325 cli();
2326 cmd->device->disconnect = 1;
2327 LIST(cmd,hostdata->disconnected_queue);
2328 NEXT(cmd) = hostdata->disconnected_queue;
2329 hostdata->connected = NULL;
2330 hostdata->disconnected_queue = cmd;
2331 restore_flags(flags);
2332 QU_PRINTK("scsi%d: command for target %d lun %d was "
2333 "moved from connected to the "
2334 "disconnected_queue\n", HOSTNO,
2335 cmd->target, cmd->lun);
2336 /*
2337 * Restore phase bits to 0 so an interrupted selection,
2338 * arbitration can resume.
2339 */
2340 NCR5380_write(TARGET_COMMAND_REG, 0);
2341
2342 /* Enable reselect interrupts */
2343 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2344 /* Wait for bus free to avoid nasty timeouts */
2345 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2346 barrier();
2347 return;
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 /* Enable reselect interrupts */
2363 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2364 break;
2365 case EXTENDED_MESSAGE:
2366 /*
2367 * Extended messages are sent in the following format :
2368 * Byte
2369 * 0 EXTENDED_MESSAGE == 1
2370 * 1 length (includes one byte for code, doesn't
2371 * include first two bytes)
2372 * 2 code
2373 * 3..length+1 arguments
2374 *
2375 * Start the extended message buffer with the EXTENDED_MESSAGE
2376 * byte, since print_msg() wants the whole thing.
2377 */
2378 extended_msg[0] = EXTENDED_MESSAGE;
2379 /* Accept first byte by clearing ACK */
2380 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2381
2382 EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
2383
2384 len = 2;
2385 data = extended_msg + 1;
2386 phase = PHASE_MSGIN;
2387 NCR5380_transfer_pio(instance, &phase, &len, &data);
2388 EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2389 (int)extended_msg[1], (int)extended_msg[2]);
2390
2391 if (!len && extended_msg[1] <=
2392 (sizeof (extended_msg) - 1)) {
2393 /* Accept third byte by clearing ACK */
2394 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
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 EXT_PRINTK("scsi%d: message received, residual %d\n",
2401 HOSTNO, len);
2402
2403 switch (extended_msg[2]) {
2404 case EXTENDED_SDTR:
2405 case EXTENDED_WDTR:
2406 case EXTENDED_MODIFY_DATA_POINTER:
2407 case EXTENDED_EXTENDED_IDENTIFY:
2408 tmp = 0;
2409 }
2410 } else if (len) {
2411 printk(KERN_NOTICE "scsi%d: error receiving "
2412 "extended message\n", HOSTNO);
2413 tmp = 0;
2414 } else {
2415 printk(KERN_NOTICE "scsi%d: extended message "
2416 "code %02x length %d is too long\n",
2417 HOSTNO, extended_msg[2], extended_msg[1]);
2418 tmp = 0;
2419 }
2420 /* Fall through to reject message */
2421
2422 /*
2423 * If we get something weird that we aren't expecting,
2424 * reject it.
2425 */
2426 default:
2427 if (!tmp) {
2428 printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
2429 print_msg (extended_msg);
2430 printk("\n");
2431 } else if (tmp != EXTENDED_MESSAGE)
2432 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2433 "message %02x from target %d, lun %d\n",
2434 HOSTNO, tmp, cmd->target, cmd->lun);
2435 else
2436 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2437 "extended message "
2438 "code %02x, length %d from target %d, lun %d\n",
2439 HOSTNO, extended_msg[1], extended_msg[0],
2440 cmd->target, cmd->lun);
2441
2442
2443 msgout = MESSAGE_REJECT;
2444 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2445 ICR_ASSERT_ATN);
2446 break;
2447 } /* switch (tmp) */
2448 break;
2449 case PHASE_MSGOUT:
2450 len = 1;
2451 data = &msgout;
2452 hostdata->last_message = msgout;
2453 NCR5380_transfer_pio(instance, &phase, &len, &data);
2454 if (msgout == ABORT) {
2455 #ifdef SUPPORT_TAGS
2456 cmd_free_tag( cmd );
2457 #else
2458 hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
2459 #endif
2460 hostdata->connected = NULL;
2461 cmd->result = DID_ERROR << 16;
2462 #ifdef NCR5380_STATS
2463 collect_stats(hostdata, cmd);
2464 #endif
2465 cmd->scsi_done(cmd);
2466 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2467 return;
2468 }
2469 msgout = NOP;
2470 break;
2471 case PHASE_CMDOUT:
2472 len = cmd->cmd_len;
2473 data = cmd->cmnd;
2474 /*
2475 * XXX for performance reasons, on machines with a
2476 * PSEUDO-DMA architecture we should probably
2477 * use the dma transfer function.
2478 */
2479 NCR5380_transfer_pio(instance, &phase, &len,
2480 &data);
2481 break;
2482 case PHASE_STATIN:
2483 len = 1;
2484 data = &tmp;
2485 NCR5380_transfer_pio(instance, &phase, &len, &data);
2486 cmd->SCp.Status = tmp;
2487 break;
2488 default:
2489 printk("scsi%d: unknown phase\n", HOSTNO);
2490 NCR_PRINT(NDEBUG_ANY);
2491 } /* switch(phase) */
2492 } /* if (tmp * SR_REQ) */
2493 } /* while (1) */
2494 }
2495
2496 /*
2497 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2498 *
2499 * Purpose : does reselection, initializing the instance->connected
2500 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2501 * nexus has been reestablished,
2502 *
2503 * Inputs : instance - this instance of the NCR5380.
2504 *
2505 */
2506
2507 /* it might eventually prove necessary to do a dma setup on
2508 reselection, but it doesn't seem to be needed now -- sam */
2509
2510 static void NCR5380_reselect (struct Scsi_Host *instance)
2511 {
2512 SETUP_HOSTDATA(instance);
2513 unsigned char target_mask;
2514 unsigned char lun;
2515 #ifdef SUPPORT_TAGS
2516 unsigned char tag;
2517 #endif
2518 unsigned char msg[3];
2519 Scsi_Cmnd *tmp = NULL, *prev;
2520 /* unsigned long flags; */
2521
2522 /*
2523 * Disable arbitration, etc. since the host adapter obviously
2524 * lost, and tell an interrupted NCR5380_select() to restart.
2525 */
2526
2527 NCR5380_write(MODE_REG, MR_BASE);
2528 hostdata->restart_select = 1;
2529
2530 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2531
2532 RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
2533
2534 /*
2535 * At this point, we have detected that our SCSI ID is on the bus,
2536 * SEL is true and BSY was false for at least one bus settle delay
2537 * (400 ns).
2538 *
2539 * We must assert BSY ourselves, until the target drops the SEL
2540 * signal.
2541 */
2542
2543 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2544
2545 while (NCR5380_read(STATUS_REG) & SR_SEL);
2546 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2547
2548 /*
2549 * Wait for target to go into MSGIN.
2550 */
2551
2552 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
2553
2554 #if 1
2555 // acknowledge toggle to MSGIN
2556 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN));
2557
2558 // peek at the byte without really hitting the bus
2559 msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG);
2560 #endif
2561
2562 if (!msg[0] & 0x80) {
2563 printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
2564 print_msg(msg);
2565 do_abort(instance);
2566 return;
2567 }
2568 lun = (msg[0] & 0x07);
2569
2570 /*
2571 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2572 * just reestablished, and remove it from the disconnected queue.
2573 */
2574
2575 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL;
2576 tmp; prev = tmp, tmp = NEXT(tmp) ) {
2577 if ((target_mask == (1 << tmp->target)) && (lun == tmp->lun)
2578 #ifdef SUPPORT_TAGS
2579 && (tag == tmp->tag)
2580 #endif
2581 ) {
2582 if (prev) {
2583 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
2584 NEXT(prev) = NEXT(tmp);
2585 } else {
2586 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2587 hostdata->disconnected_queue = NEXT(tmp);
2588 }
2589 NEXT(tmp) = NULL;
2590 break;
2591 }
2592 }
2593
2594 if (!tmp) {
2595 printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
2596 #ifdef SUPPORT_TAGS
2597 "tag %d "
2598 #endif
2599 "not in disconnected_queue.\n",
2600 HOSTNO, target_mask, lun
2601 #ifdef SUPPORT_TAGS
2602 , tag
2603 #endif
2604 );
2605 /*
2606 * Since we have an established nexus that we can't do anything
2607 * with, we must abort it.
2608 */
2609 do_abort(instance);
2610 return;
2611 }
2612 #if 1
2613 /* engage dma setup for the command we just saw */
2614 {
2615 void *d;
2616 unsigned long count;
2617
2618 if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) {
2619 count = tmp->SCp.buffer->length;
2620 d = tmp->SCp.buffer->address;
2621 } else {
2622 count = tmp->SCp.this_residual;
2623 d = tmp->SCp.ptr;
2624 }
2625 #ifdef REAL_DMA
2626 /* setup this command for dma if not already */
2627 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done
2628 != tmp))
2629 {
2630 sun3scsi_dma_setup(d, count,
2631 tmp->request.cmd);
2632 sun3_dma_setup_done = tmp;
2633 }
2634 #endif
2635 }
2636 #endif
2637
2638 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
2639 /* Accept message by clearing ACK */
2640 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2641
2642 #ifdef SUPPORT_TAGS
2643 /* If the phase is still MSGIN, the target wants to send some more
2644 * messages. In case it supports tagged queuing, this is probably a
2645 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2646 */
2647 tag = TAG_NONE;
2648 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2649 /* Accept previous IDENTIFY message by clearing ACK */
2650 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2651 len = 2;
2652 data = msg+1;
2653 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2654 msg[1] == SIMPLE_QUEUE_TAG)
2655 tag = msg[2];
2656 TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
2657 "reselection\n", HOSTNO, target_mask, lun, tag);
2658 }
2659 #endif
2660
2661 hostdata->connected = tmp;
2662 RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2663 HOSTNO, tmp->target, tmp->lun, tmp->tag);
2664 }
2665
2666
2667 /*
2668 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2669 *
2670 * Purpose : abort a command
2671 *
2672 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2673 * host byte of the result field to, if zero DID_ABORTED is
2674 * used.
2675 *
2676 * Returns : 0 - success, -1 on failure.
2677 *
2678 * XXX - there is no way to abort the command that is currently
2679 * connected, you have to wait for it to complete. If this is
2680 * a problem, we could implement longjmp() / setjmp(), setjmp()
2681 * called where the loop started in NCR5380_main().
2682 */
2683
2684 #ifndef NCR5380_abort
2685 static
2686 #endif
2687 int NCR5380_abort (Scsi_Cmnd *cmd)
2688 {
2689 struct Scsi_Host *instance = cmd->host;
2690 SETUP_HOSTDATA(instance);
2691 Scsi_Cmnd *tmp, **prev;
2692 unsigned long flags;
2693
2694 printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
2695 print_Scsi_Cmnd (cmd);
2696
2697 NCR5380_print_status (instance);
2698
2699 save_flags(flags);
2700 cli();
2701
2702 ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
2703 NCR5380_read(BUS_AND_STATUS_REG),
2704 NCR5380_read(STATUS_REG));
2705
2706 #if 1
2707 /*
2708 * Case 1 : If the command is the currently executing command,
2709 * we'll set the aborted flag and return control so that
2710 * information transfer routine can exit cleanly.
2711 */
2712
2713 if (hostdata->connected == cmd) {
2714
2715 ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO);
2716 /*
2717 * We should perform BSY checking, and make sure we haven't slipped
2718 * into BUS FREE.
2719 */
2720
2721 /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2722 /*
2723 * Since we can't change phases until we've completed the current
2724 * handshake, we have to source or sink a byte of data if the current
2725 * phase is not MSGOUT.
2726 */
2727
2728 /*
2729 * Return control to the executing NCR drive so we can clear the
2730 * aborted flag and get back into our main loop.
2731 */
2732
2733 if (do_abort(instance) == 0) {
2734 hostdata->aborted = 1;
2735 hostdata->connected = NULL;
2736 cmd->result = DID_ABORT << 16;
2737 #ifdef SUPPORT_TAGS
2738 cmd_free_tag( cmd );
2739 #else
2740 hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
2741 #endif
2742 restore_flags(flags);
2743 cmd->scsi_done(cmd);
2744 return SCSI_ABORT_SUCCESS;
2745 } else {
2746 /* restore_flags(flags); */
2747 printk("scsi%d: abort of connected command failed!\n", HOSTNO);
2748 return SCSI_ABORT_ERROR;
2749 }
2750 }
2751 #endif
2752
2753 /*
2754 * Case 2 : If the command hasn't been issued yet, we simply remove it
2755 * from the issue queue.
2756 */
2757 for (prev = (Scsi_Cmnd **) &(hostdata->issue_queue),
2758 tmp = (Scsi_Cmnd *) hostdata->issue_queue;
2759 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
2760 if (cmd == tmp) {
2761 REMOVE(5, *prev, tmp, NEXT(tmp));
2762 (*prev) = NEXT(tmp);
2763 NEXT(tmp) = NULL;
2764 tmp->result = DID_ABORT << 16;
2765 restore_flags(flags);
2766 ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
2767 HOSTNO);
2768 /* Tagged queuing note: no tag to free here, hasn't been assigned
2769 * yet... */
2770 tmp->scsi_done(tmp);
2771 return SCSI_ABORT_SUCCESS;
2772 }
2773
2774 /*
2775 * Case 3 : If any commands are connected, we're going to fail the abort
2776 * and let the high level SCSI driver retry at a later time or
2777 * issue a reset.
2778 *
2779 * Timeouts, and therefore aborted commands, will be highly unlikely
2780 * and handling them cleanly in this situation would make the common
2781 * case of noresets less efficient, and would pollute our code. So,
2782 * we fail.
2783 */
2784
2785 if (hostdata->connected) {
2786 restore_flags(flags);
2787 ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
2788 return SCSI_ABORT_SNOOZE;
2789 }
2790
2791 /*
2792 * Case 4: If the command is currently disconnected from the bus, and
2793 * there are no connected commands, we reconnect the I_T_L or
2794 * I_T_L_Q nexus associated with it, go into message out, and send
2795 * an abort message.
2796 *
2797 * This case is especially ugly. In order to reestablish the nexus, we
2798 * need to call NCR5380_select(). The easiest way to implement this
2799 * function was to abort if the bus was busy, and let the interrupt
2800 * handler triggered on the SEL for reselect take care of lost arbitrations
2801 * where necessary, meaning interrupts need to be enabled.
2802 *
2803 * When interrupts are enabled, the queues may change - so we
2804 * can't remove it from the disconnected queue before selecting it
2805 * because that could cause a failure in hashing the nexus if that
2806 * device reselected.
2807 *
2808 * Since the queues may change, we can't use the pointers from when we
2809 * first locate it.
2810 *
2811 * So, we must first locate the command, and if NCR5380_select()
2812 * succeeds, then issue the abort, relocate the command and remove
2813 * it from the disconnected queue.
2814 */
2815
2816 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp;
2817 tmp = NEXT(tmp))
2818 if (cmd == tmp) {
2819 restore_flags(flags);
2820 ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
2821
2822 if (NCR5380_select (instance, cmd, (int) cmd->tag))
2823 return SCSI_ABORT_BUSY;
2824
2825 ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
2826
2827 do_abort (instance);
2828
2829 save_flags(flags);
2830 cli();
2831 for (prev = (Scsi_Cmnd **) &(hostdata->disconnected_queue),
2832 tmp = (Scsi_Cmnd *) hostdata->disconnected_queue;
2833 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
2834 if (cmd == tmp) {
2835 REMOVE(5, *prev, tmp, NEXT(tmp));
2836 *prev = NEXT(tmp);
2837 NEXT(tmp) = NULL;
2838 tmp->result = DID_ABORT << 16;
2839 /* We must unlock the tag/LUN immediately here, since the
2840 * target goes to BUS FREE and doesn't send us another
2841 * message (COMMAND_COMPLETE or the like)
2842 */
2843 #ifdef SUPPORT_TAGS
2844 cmd_free_tag( tmp );
2845 #else
2846 hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
2847 #endif
2848 restore_flags(flags);
2849 tmp->scsi_done(tmp);
2850 return SCSI_ABORT_SUCCESS;
2851 }
2852 }
2853
2854 /*
2855 * Case 5 : If we reached this point, the command was not found in any of
2856 * the queues.
2857 *
2858 * We probably reached this point because of an unlikely race condition
2859 * between the command completing successfully and the abortion code,
2860 * so we won't panic, but we will notify the user in case something really
2861 * broke.
2862 */
2863
2864 restore_flags(flags);
2865 printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully\n"
2866 KERN_INFO " before abortion\n", HOSTNO);
2867
2868 return SCSI_ABORT_NOT_RUNNING;
2869 }
2870
2871
2872 /*
2873 * Function : int NCR5380_reset (Scsi_Cmnd *cmd, unsigned int reset_flags)
2874 *
2875 * Purpose : reset the SCSI bus.
2876 *
2877 * Returns : SCSI_RESET_WAKEUP
2878 *
2879 */
2880
2881 int NCR5380_reset( Scsi_Cmnd *cmd, unsigned int reset_flags)
2882 {
2883 SETUP_HOSTDATA(cmd->host);
2884 int i;
2885 unsigned long flags;
2886 #if 1
2887 Scsi_Cmnd *connected, *disconnected_queue;
2888 #endif
2889
2890
2891 NCR5380_print_status (cmd->host);
2892
2893 /* get in phase */
2894 NCR5380_write( TARGET_COMMAND_REG,
2895 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
2896 /* assert RST */
2897 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
2898 udelay (40);
2899 /* reset NCR registers */
2900 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2901 NCR5380_write( MODE_REG, MR_BASE );
2902 NCR5380_write( TARGET_COMMAND_REG, 0 );
2903 NCR5380_write( SELECT_ENABLE_REG, 0 );
2904 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2905 * through anymore ... */
2906 (void)NCR5380_read( RESET_PARITY_INTERRUPT_REG );
2907
2908 #if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
2909 /* XXX see below XXX */
2910
2911 /* MSch: old-style reset: actually abort all command processing here */
2912
2913 /* After the reset, there are no more connected or disconnected commands
2914 * and no busy units; to avoid problems with re-inserting the commands
2915 * into the issue_queue (via scsi_done()), the aborted commands are
2916 * remembered in local variables first.
2917 */
2918 save_flags(flags);
2919 cli();
2920 connected = (Scsi_Cmnd *)hostdata->connected;
2921 hostdata->connected = NULL;
2922 disconnected_queue = (Scsi_Cmnd *)hostdata->disconnected_queue;
2923 hostdata->disconnected_queue = NULL;
2924 #ifdef SUPPORT_TAGS
2925 free_all_tags();
2926 #endif
2927 for( i = 0; i < 8; ++i )
2928 hostdata->busy[i] = 0;
2929 #ifdef REAL_DMA
2930 hostdata->dma_len = 0;
2931 #endif
2932 restore_flags(flags);
2933
2934 /* In order to tell the mid-level code which commands were aborted,
2935 * set the command status to DID_RESET and call scsi_done() !!!
2936 * This ultimately aborts processing of these commands in the mid-level.
2937 */
2938
2939 if ((cmd = connected)) {
2940 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2941 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2942 cmd->scsi_done( cmd );
2943 }
2944
2945 for (i = 0; (cmd = disconnected_queue); ++i) {
2946 disconnected_queue = NEXT(cmd);
2947 NEXT(cmd) = NULL;
2948 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2949 cmd->scsi_done( cmd );
2950 }
2951 if (i > 0)
2952 ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
2953
2954
2955 /* since all commands have been explicitly terminated, we need to tell
2956 * the midlevel code that the reset was SUCCESSFUL, and there is no
2957 * need to 'wake up' the commands by a request_sense
2958 */
2959 return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
2960 #else /* 1 */
2961
2962 /* MSch: new-style reset handling: let the mid-level do what it can */
2963
2964 /* ++guenther: MID-LEVEL IS STILL BROKEN.
2965 * Mid-level is supposed to requeue all commands that were active on the
2966 * various low-level queues. In fact it does this, but that's not enough
2967 * because all these commands are subject to timeout. And if a timeout
2968 * happens for any removed command, *_abort() is called but all queues
2969 * are now empty. Abort then gives up the falcon lock, which is fatal,
2970 * since the mid-level will queue more commands and must have the lock
2971 * (it's all happening inside timer interrupt handler!!).
2972 * Even worse, abort will return NOT_RUNNING for all those commands not
2973 * on any queue, so they won't be retried ...
2974 *
2975 * Conclusion: either scsi.c disables timeout for all resetted commands
2976 * immediately, or we loose! As of linux-2.0.20 it doesn't.
2977 */
2978
2979 /* After the reset, there are no more connected or disconnected commands
2980 * and no busy units; so clear the low-level status here to avoid
2981 * conflicts when the mid-level code tries to wake up the affected
2982 * commands!
2983 */
2984
2985 if (hostdata->issue_queue)
2986 ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
2987 if (hostdata->connected)
2988 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2989 if (hostdata->disconnected_queue)
2990 ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
2991
2992 save_flags(flags);
2993 cli();
2994 hostdata->issue_queue = NULL;
2995 hostdata->connected = NULL;
2996 hostdata->disconnected_queue = NULL;
2997 #ifdef SUPPORT_TAGS
2998 free_all_tags();
2999 #endif
3000 for( i = 0; i < 8; ++i )
3001 hostdata->busy[i] = 0;
3002 #ifdef REAL_DMA
3003 hostdata->dma_len = 0;
3004 #endif
3005 restore_flags(flags);
3006
3007 /* we did no complete reset of all commands, so a wakeup is required */
3008 return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;
3009 #endif /* 1 */
3010 }
3011
3012 /* Local Variables: */
3013 /* tab-width: 8 */
3014 /* End: */
3015