blob: 7e19589e71a06c33d6cf94558c390b0b88f14457 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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 */
db9dff32005-04-03 14:53:59 -050072#include <scsi/scsi_dbg.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
74/*
75 * Further development / testing that should be done :
76 * 1. Test linked command handling code after Eric is ready with
77 * the high level code.
78 */
79
80#if (NDEBUG & NDEBUG_LISTS)
81#define LIST(x,y) \
82 { printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); \
83 if ((x)==(y)) udelay(5); }
84#define REMOVE(w,x,y,z) \
85 { printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, \
86 (void*)(w), (void*)(x), (void*)(y), (void*)(z)); \
87 if ((x)==(y)) udelay(5); }
88#else
89#define LIST(x,y)
90#define REMOVE(w,x,y,z)
91#endif
92
93#ifndef notyet
94#undef LINKED
95#endif
96
97/*
98 * Design
99 * Issues :
100 *
101 * The other Linux SCSI drivers were written when Linux was Intel PC-only,
102 * and specifically for each board rather than each chip. This makes their
103 * adaptation to platforms like the Mac (Some of which use NCR5380's)
104 * more difficult than it has to be.
105 *
106 * Also, many of the SCSI drivers were written before the command queuing
107 * routines were implemented, meaning their implementations of queued
108 * commands were hacked on rather than designed in from the start.
109 *
110 * When I designed the Linux SCSI drivers I figured that
111 * while having two different SCSI boards in a system might be useful
112 * for debugging things, two of the same type wouldn't be used.
113 * Well, I was wrong and a number of users have mailed me about running
114 * multiple high-performance SCSI boards in a server.
115 *
116 * Finally, when I get questions from users, I have no idea what
117 * revision of my driver they are running.
118 *
119 * This driver attempts to address these problems :
120 * This is a generic 5380 driver. To use it on a different platform,
121 * one simply writes appropriate system specific macros (ie, data
122 * transfer - some PC's will use the I/O bus, 68K's must use
123 * memory mapped) and drops this file in their 'C' wrapper.
124 *
125 * As far as command queueing, two queues are maintained for
126 * each 5380 in the system - commands that haven't been issued yet,
127 * and commands that are currently executing. This means that an
128 * unlimited number of commands may be queued, letting
129 * more commands propagate from the higher driver levels giving higher
130 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
131 * allowing multiple commands to propagate all the way to a SCSI-II device
132 * while a command is already executing.
133 *
134 * To solve the multiple-boards-in-the-same-system problem,
135 * there is a separate instance structure for each instance
136 * of a 5380 in the system. So, multiple NCR5380 drivers will
137 * be able to coexist with appropriate changes to the high level
138 * SCSI code.
139 *
140 * A NCR5380_PUBLIC_REVISION macro is provided, with the release
141 * number (updated for each public release) printed by the
142 * NCR5380_print_options command, which should be called from the
143 * wrapper detect function, so that I know what release of the driver
144 * users are using.
145 *
146 * Issues specific to the NCR5380 :
147 *
148 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
149 * piece of hardware that requires you to sit in a loop polling for
150 * the REQ signal as long as you are connected. Some devices are
151 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
152 * while doing long seek operations.
153 *
154 * The workaround for this is to keep track of devices that have
155 * disconnected. If the device hasn't disconnected, for commands that
156 * should disconnect, we do something like
157 *
158 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
159 *
160 * Some tweaking of N and M needs to be done. An algorithm based
161 * on "time to data" would give the best results as long as short time
162 * to datas (ie, on the same track) were considered, however these
163 * broken devices are the exception rather than the rule and I'd rather
164 * spend my time optimizing for the normal case.
165 *
166 * Architecture :
167 *
168 * At the heart of the design is a coroutine, NCR5380_main,
169 * which is started when not running by the interrupt handler,
170 * timer, and queue command function. It attempts to establish
171 * I_T_L or I_T_L_Q nexuses by removing the commands from the
172 * issue queue and calling NCR5380_select() if a nexus
173 * is not established.
174 *
175 * Once a nexus is established, the NCR5380_information_transfer()
176 * phase goes through the various phases as instructed by the target.
177 * if the target goes into MSG IN and sends a DISCONNECT message,
178 * the command structure is placed into the per instance disconnected
179 * queue, and NCR5380_main tries to find more work. If USLEEP
180 * was defined, and the target is idle for too long, the system
181 * will try to sleep.
182 *
183 * If a command has disconnected, eventually an interrupt will trigger,
184 * calling NCR5380_intr() which will in turn call NCR5380_reselect
185 * to reestablish a nexus. This will run main if necessary.
186 *
187 * On command termination, the done function will be called as
188 * appropriate.
189 *
190 * SCSI pointers are maintained in the SCp field of SCSI command
191 * structures, being initialized after the command is connected
192 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
193 * Note that in violation of the standard, an implicit SAVE POINTERS operation
194 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
195 */
196
197/*
198 * Using this file :
199 * This file a skeleton Linux SCSI driver for the NCR 5380 series
200 * of chips. To use it, you write an architecture specific functions
201 * and macros and include this file in your driver.
202 *
203 * These macros control options :
204 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
205 * for commands that return with a CHECK CONDITION status.
206 *
207 * LINKED - if defined, linked commands are supported.
208 *
209 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
210 *
211 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
212 *
213 * These macros MUST be defined :
214 *
215 * NCR5380_read(register) - read from the specified register
216 *
217 * NCR5380_write(register, value) - write to the specific register
218 *
219 * Either real DMA *or* pseudo DMA may be implemented
220 * REAL functions :
221 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
222 * Note that the DMA setup functions should return the number of bytes
223 * that they were able to program the controller for.
224 *
225 * Also note that generic i386/PC versions of these macros are
226 * available as NCR5380_i386_dma_write_setup,
227 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
228 *
229 * NCR5380_dma_write_setup(instance, src, count) - initialize
230 * NCR5380_dma_read_setup(instance, dst, count) - initialize
231 * NCR5380_dma_residual(instance); - residual count
232 *
233 * PSEUDO functions :
234 * NCR5380_pwrite(instance, src, count)
235 * NCR5380_pread(instance, dst, count);
236 *
237 * If nothing specific to this implementation needs doing (ie, with external
238 * hardware), you must also define
239 *
240 * NCR5380_queue_command
241 * NCR5380_reset
242 * NCR5380_abort
243 * NCR5380_proc_info
244 *
245 * to be the global entry points into the specific driver, ie
246 * #define NCR5380_queue_command t128_queue_command.
247 *
248 * If this is not done, the routines will be defined as static functions
249 * with the NCR5380* names and the user must provide a globally
250 * accessible wrapper function.
251 *
252 * The generic driver is initialized by calling NCR5380_init(instance),
253 * after setting the appropriate host specific fields and ID. If the
254 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
255 * possible) function may be used. Before the specific driver initialization
256 * code finishes, NCR5380_print_options should be called.
257 */
258
259static struct Scsi_Host *first_instance = NULL;
260static Scsi_Host_Template *the_template = NULL;
261
262/* Macros ease life... :-) */
263#define SETUP_HOSTDATA(in) \
264 struct NCR5380_hostdata *hostdata = \
265 (struct NCR5380_hostdata *)(in)->hostdata
266#define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
267
268#define NEXT(cmd) ((Scsi_Cmnd *)((cmd)->host_scribble))
269#define NEXTADDR(cmd) ((Scsi_Cmnd **)&((cmd)->host_scribble))
270
271#define HOSTNO instance->host_no
272#define H_NO(cmd) (cmd)->device->host->host_no
273
274#define SGADDR(buffer) (void *)(((unsigned long)page_address((buffer)->page)) + \
275 (buffer)->offset)
276
277#ifdef SUPPORT_TAGS
278
279/*
280 * Functions for handling tagged queuing
281 * =====================================
282 *
283 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
284 *
285 * Using consecutive numbers for the tags is no good idea in my eyes. There
286 * could be wrong re-usings if the counter (8 bit!) wraps and some early
287 * command has been preempted for a long time. My solution: a bitfield for
288 * remembering used tags.
289 *
290 * There's also the problem that each target has a certain queue size, but we
291 * cannot know it in advance :-( We just see a QUEUE_FULL status being
292 * returned. So, in this case, the driver internal queue size assumption is
293 * reduced to the number of active tags if QUEUE_FULL is returned by the
294 * target. The command is returned to the mid-level, but with status changed
295 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
296 * correctly.
297 *
298 * We're also not allowed running tagged commands as long as an untagged
299 * command is active. And REQUEST SENSE commands after a contingent allegiance
300 * condition _must_ be untagged. To keep track whether an untagged command has
301 * been issued, the host->busy array is still employed, as it is without
302 * support for tagged queuing.
303 *
304 * One could suspect that there are possible race conditions between
305 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
306 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
307 * which already guaranteed to be running at most once. It is also the only
308 * place where tags/LUNs are allocated. So no other allocation can slip
309 * between that pair, there could only happen a reselection, which can free a
310 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
311 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
312 */
313
314/* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
315#undef TAG_NONE
316#define TAG_NONE 0xff
317
318/* For the m68k, the number of bits in 'allocated' must be a multiple of 32! */
319#if (MAX_TAGS % 32) != 0
320#error "MAX_TAGS must be a multiple of 32!"
321#endif
322
323typedef struct {
324 char allocated[MAX_TAGS/8];
325 int nr_allocated;
326 int queue_size;
327} TAG_ALLOC;
328
329static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */
330
331
332static void __init init_tags( void )
333{
334 int target, lun;
335 TAG_ALLOC *ta;
336
337 if (!setup_use_tagged_queuing)
338 return;
339
340 for( target = 0; target < 8; ++target ) {
341 for( lun = 0; lun < 8; ++lun ) {
342 ta = &TagAlloc[target][lun];
343 memset( &ta->allocated, 0, MAX_TAGS/8 );
344 ta->nr_allocated = 0;
345 /* At the beginning, assume the maximum queue size we could
346 * support (MAX_TAGS). This value will be decreased if the target
347 * returns QUEUE_FULL status.
348 */
349 ta->queue_size = MAX_TAGS;
350 }
351 }
352}
353
354
355/* Check if we can issue a command to this LUN: First see if the LUN is marked
356 * busy by an untagged command. If the command should use tagged queuing, also
357 * check that there is a free tag and the target's queue won't overflow. This
358 * function should be called with interrupts disabled to avoid race
359 * conditions.
360 */
361
362static int is_lun_busy( Scsi_Cmnd *cmd, int should_be_tagged )
363{
364 SETUP_HOSTDATA(cmd->device->host);
365
366 if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun))
367 return( 1 );
368 if (!should_be_tagged ||
369 !setup_use_tagged_queuing || !cmd->device->tagged_supported)
370 return( 0 );
371 if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >=
372 TagAlloc[cmd->device->id][cmd->device->lun].queue_size ) {
373 TAG_PRINTK( "scsi%d: target %d lun %d: no free tags\n",
374 H_NO(cmd), cmd->device->id, cmd->device->lun );
375 return( 1 );
376 }
377 return( 0 );
378}
379
380
381/* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
382 * must be called before!), or reserve the LUN in 'busy' if the command is
383 * untagged.
384 */
385
386static void cmd_get_tag( Scsi_Cmnd *cmd, int should_be_tagged )
387{
388 SETUP_HOSTDATA(cmd->device->host);
389
390 /* If we or the target don't support tagged queuing, allocate the LUN for
391 * an untagged command.
392 */
393 if (!should_be_tagged ||
394 !setup_use_tagged_queuing || !cmd->device->tagged_supported) {
395 cmd->tag = TAG_NONE;
396 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
397 TAG_PRINTK( "scsi%d: target %d lun %d now allocated by untagged "
398 "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun );
399 }
400 else {
401 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
402
403 cmd->tag = find_first_zero_bit( &ta->allocated, MAX_TAGS );
404 set_bit( cmd->tag, &ta->allocated );
405 ta->nr_allocated++;
406 TAG_PRINTK( "scsi%d: using tag %d for target %d lun %d "
407 "(now %d tags in use)\n",
408 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun,
409 ta->nr_allocated );
410 }
411}
412
413
414/* Mark the tag of command 'cmd' as free, or in case of an untagged command,
415 * unlock the LUN.
416 */
417
418static void cmd_free_tag( Scsi_Cmnd *cmd )
419{
420 SETUP_HOSTDATA(cmd->device->host);
421
422 if (cmd->tag == TAG_NONE) {
423 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
424 TAG_PRINTK( "scsi%d: target %d lun %d untagged cmd finished\n",
425 H_NO(cmd), cmd->device->id, cmd->device->lun );
426 }
427 else if (cmd->tag >= MAX_TAGS) {
428 printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
429 H_NO(cmd), cmd->tag );
430 }
431 else {
432 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
433 clear_bit( cmd->tag, &ta->allocated );
434 ta->nr_allocated--;
435 TAG_PRINTK( "scsi%d: freed tag %d for target %d lun %d\n",
436 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun );
437 }
438}
439
440
441static void free_all_tags( void )
442{
443 int target, lun;
444 TAG_ALLOC *ta;
445
446 if (!setup_use_tagged_queuing)
447 return;
448
449 for( target = 0; target < 8; ++target ) {
450 for( lun = 0; lun < 8; ++lun ) {
451 ta = &TagAlloc[target][lun];
452 memset( &ta->allocated, 0, MAX_TAGS/8 );
453 ta->nr_allocated = 0;
454 }
455 }
456}
457
458#endif /* SUPPORT_TAGS */
459
460
461/*
462 * Function: void merge_contiguous_buffers( Scsi_Cmnd *cmd )
463 *
464 * Purpose: Try to merge several scatter-gather requests into one DMA
465 * transfer. This is possible if the scatter buffers lie on
466 * physical contiguous addresses.
467 *
468 * Parameters: Scsi_Cmnd *cmd
469 * The command to work on. The first scatter buffer's data are
470 * assumed to be already transfered into ptr/this_residual.
471 */
472
473static void merge_contiguous_buffers( Scsi_Cmnd *cmd )
474{
475 unsigned long endaddr;
476#if (NDEBUG & NDEBUG_MERGING)
477 unsigned long oldlen = cmd->SCp.this_residual;
478 int cnt = 1;
479#endif
480
481 for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1;
482 cmd->SCp.buffers_residual &&
483 virt_to_phys(SGADDR(&(cmd->SCp.buffer[1]))) == endaddr; ) {
484
485 MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
486 SGADDR(&(cmd->SCp.buffer[1])), endaddr);
487#if (NDEBUG & NDEBUG_MERGING)
488 ++cnt;
489#endif
490 ++cmd->SCp.buffer;
491 --cmd->SCp.buffers_residual;
492 cmd->SCp.this_residual += cmd->SCp.buffer->length;
493 endaddr += cmd->SCp.buffer->length;
494 }
495#if (NDEBUG & NDEBUG_MERGING)
496 if (oldlen != cmd->SCp.this_residual)
497 MER_PRINTK("merged %d buffers from %p, new length %08x\n",
498 cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
499#endif
500}
501
502/*
503 * Function : void initialize_SCp(Scsi_Cmnd *cmd)
504 *
505 * Purpose : initialize the saved data pointers for cmd to point to the
506 * start of the buffer.
507 *
508 * Inputs : cmd - Scsi_Cmnd structure to have pointers reset.
509 */
510
511static __inline__ void initialize_SCp(Scsi_Cmnd *cmd)
512{
513 /*
514 * Initialize the Scsi Pointer field so that all of the commands in the
515 * various queues are valid.
516 */
517
518 if (cmd->use_sg) {
519 cmd->SCp.buffer = (struct scatterlist *) cmd->buffer;
520 cmd->SCp.buffers_residual = cmd->use_sg - 1;
521 cmd->SCp.ptr = (char *) SGADDR(cmd->SCp.buffer);
522 cmd->SCp.this_residual = cmd->SCp.buffer->length;
523
524 /* ++roman: Try to merge some scatter-buffers if they are at
525 * contiguous physical addresses.
526 */
527// merge_contiguous_buffers( cmd );
528 } else {
529 cmd->SCp.buffer = NULL;
530 cmd->SCp.buffers_residual = 0;
531 cmd->SCp.ptr = (char *) cmd->request_buffer;
532 cmd->SCp.this_residual = cmd->request_bufflen;
533 }
534
535}
536
537#include <linux/config.h>
538#include <linux/delay.h>
539
540#if 1
541static struct {
542 unsigned char mask;
543 const char * name;}
544signals[] = {{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" },
545 { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" },
546 { SR_SEL, "SEL" }, {0, NULL}},
547basrs[] = {{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}},
548icrs[] = {{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
549 {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"},
550 {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"},
551 {0, NULL}},
552mrs[] = {{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"},
553 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR,
554 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"},
555 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
556 {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"},
557 {0, NULL}};
558
559/*
560 * Function : void NCR5380_print(struct Scsi_Host *instance)
561 *
562 * Purpose : print the SCSI bus signals for debugging purposes
563 *
564 * Input : instance - which NCR5380
565 */
566
567static void NCR5380_print(struct Scsi_Host *instance) {
568 unsigned char status, data, basr, mr, icr, i;
569 unsigned long flags;
570
571 local_irq_save(flags);
572 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
573 status = NCR5380_read(STATUS_REG);
574 mr = NCR5380_read(MODE_REG);
575 icr = NCR5380_read(INITIATOR_COMMAND_REG);
576 basr = NCR5380_read(BUS_AND_STATUS_REG);
577 local_irq_restore(flags);
578 printk("STATUS_REG: %02x ", status);
579 for (i = 0; signals[i].mask ; ++i)
580 if (status & signals[i].mask)
581 printk(",%s", signals[i].name);
582 printk("\nBASR: %02x ", basr);
583 for (i = 0; basrs[i].mask ; ++i)
584 if (basr & basrs[i].mask)
585 printk(",%s", basrs[i].name);
586 printk("\nICR: %02x ", icr);
587 for (i = 0; icrs[i].mask; ++i)
588 if (icr & icrs[i].mask)
589 printk(",%s", icrs[i].name);
590 printk("\nMODE: %02x ", mr);
591 for (i = 0; mrs[i].mask; ++i)
592 if (mr & mrs[i].mask)
593 printk(",%s", mrs[i].name);
594 printk("\n");
595}
596
597static struct {
598 unsigned char value;
599 const char *name;
600} phases[] = {
601 {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
602 {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
603 {PHASE_UNKNOWN, "UNKNOWN"}};
604
605/*
606 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
607 *
608 * Purpose : print the current SCSI phase for debugging purposes
609 *
610 * Input : instance - which NCR5380
611 */
612
613static void NCR5380_print_phase(struct Scsi_Host *instance)
614{
615 unsigned char status;
616 int i;
617
618 status = NCR5380_read(STATUS_REG);
619 if (!(status & SR_REQ))
620 printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
621 else {
622 for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
623 (phases[i].value != (status & PHASE_MASK)); ++i);
624 printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name);
625 }
626}
627
628#else /* !NDEBUG */
629
630/* dummies... */
631__inline__ void NCR5380_print(struct Scsi_Host *instance) { };
632__inline__ void NCR5380_print_phase(struct Scsi_Host *instance) { };
633
634#endif
635
636/*
637 * ++roman: New scheme of calling NCR5380_main()
638 *
639 * If we're not in an interrupt, we can call our main directly, it cannot be
640 * already running. Else, we queue it on a task queue, if not 'main_running'
641 * tells us that a lower level is already executing it. This way,
642 * 'main_running' needs not be protected in a special way.
643 *
644 * queue_main() is a utility function for putting our main onto the task
645 * queue, if main_running is false. It should be called only from a
646 * interrupt or bottom half.
647 */
648
649#include <linux/workqueue.h>
650#include <linux/interrupt.h>
651
652static volatile int main_running = 0;
653static DECLARE_WORK(NCR5380_tqueue, (void (*)(void*))NCR5380_main, NULL);
654
655static __inline__ void queue_main(void)
656{
657 if (!main_running) {
658 /* If in interrupt and NCR5380_main() not already running,
659 queue it on the 'immediate' task queue, to be processed
660 immediately after the current interrupt processing has
661 finished. */
662 schedule_work(&NCR5380_tqueue);
663 }
664 /* else: nothing to do: the running NCR5380_main() will pick up
665 any newly queued command. */
666}
667
668
669static inline void NCR5380_all_init (void)
670{
671 static int done = 0;
672 if (!done) {
673 INI_PRINTK("scsi : NCR5380_all_init()\n");
674 done = 1;
675 }
676}
677
678
679/*
680 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
681 *
682 * Purpose : called by probe code indicating the NCR5380 driver
683 * options that were selected.
684 *
685 * Inputs : instance, pointer to this instance. Unused.
686 */
687
688static void __init NCR5380_print_options (struct Scsi_Host *instance)
689{
690 printk(" generic options"
691#ifdef AUTOSENSE
692 " AUTOSENSE"
693#endif
694#ifdef REAL_DMA
695 " REAL DMA"
696#endif
697#ifdef PARITY
698 " PARITY"
699#endif
700#ifdef SUPPORT_TAGS
701 " SCSI-2 TAGGED QUEUING"
702#endif
703 );
704 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
705}
706
707/*
708 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
709 *
710 * Purpose : print commands in the various queues, called from
711 * NCR5380_abort and NCR5380_debug to aid debugging.
712 *
713 * Inputs : instance, pointer to this instance.
714 */
715
716static void NCR5380_print_status (struct Scsi_Host *instance)
717{
718 char *pr_bfr;
719 char *start;
720 int len;
721
722 NCR_PRINT(NDEBUG_ANY);
723 NCR_PRINT_PHASE(NDEBUG_ANY);
724
725 pr_bfr = (char *) __get_free_page(GFP_ATOMIC);
726 if (!pr_bfr) {
727 printk("NCR5380_print_status: no memory for print buffer\n");
728 return;
729 }
730 len = NCR5380_proc_info(instance, pr_bfr, &start, 0, PAGE_SIZE, 0);
731 pr_bfr[len] = 0;
732 printk("\n%s\n", pr_bfr);
733 free_page((unsigned long) pr_bfr);
734}
735
736
737/******************************************/
738/*
739 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
740 *
741 * *buffer: I/O buffer
742 * **start: if inout == FALSE pointer into buffer where user read should start
743 * offset: current offset
744 * length: length of buffer
745 * hostno: Scsi_Host host_no
746 * inout: TRUE - user is writing; FALSE - user is reading
747 *
748 * Return the number of bytes read from or written
749*/
750
751#undef SPRINTF
752#define SPRINTF(fmt,args...) \
753 do { if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \
754 pos += sprintf(pos, fmt , ## args); } while(0)
755static
756char *lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length);
757
758static int NCR5380_proc_info (struct Scsi_Host *instance, char *buffer, char **start,
759 off_t offset, int length, int inout)
760{
761 char *pos = buffer;
762 struct NCR5380_hostdata *hostdata;
763 Scsi_Cmnd *ptr;
764 unsigned long flags;
765 off_t begin = 0;
766#define check_offset() \
767 do { \
768 if (pos - buffer < offset - begin) { \
769 begin += pos - buffer; \
770 pos = buffer; \
771 } \
772 } while (0)
773
774 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
775
776 if (inout) { /* Has data been written to the file ? */
777 return(-ENOSYS); /* Currently this is a no-op */
778 }
779 SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
780 check_offset();
781 local_irq_save(flags);
782 SPRINTF("NCR5380: coroutine is%s running.\n", main_running ? "" : "n't");
783 check_offset();
784 if (!hostdata->connected)
785 SPRINTF("scsi%d: no currently connected command\n", HOSTNO);
786 else
787 pos = lprint_Scsi_Cmnd ((Scsi_Cmnd *) hostdata->connected,
788 pos, buffer, length);
789 SPRINTF("scsi%d: issue_queue\n", HOSTNO);
790 check_offset();
791 for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = NEXT(ptr)) {
792 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
793 check_offset();
794 }
795
796 SPRINTF("scsi%d: disconnected_queue\n", HOSTNO);
797 check_offset();
798 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
799 ptr = NEXT(ptr)) {
800 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
801 check_offset();
802 }
803
804 local_irq_restore(flags);
805 *start = buffer + (offset - begin);
806 if (pos - buffer < offset - begin)
807 return 0;
808 else if (pos - buffer - (offset - begin) < length)
809 return pos - buffer - (offset - begin);
810 return length;
811}
812
813static char *
814lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length)
815{
816 int i, s;
817 unsigned char *command;
818 SPRINTF("scsi%d: destination target %d, lun %d\n",
819 H_NO(cmd), cmd->device->id, cmd->device->lun);
820 SPRINTF(" command = ");
821 command = cmd->cmnd;
822 SPRINTF("%2d (0x%02x)", command[0], command[0]);
823 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
824 SPRINTF(" %02x", command[i]);
825 SPRINTF("\n");
826 return pos;
827}
828
829
830/*
831 * Function : void NCR5380_init (struct Scsi_Host *instance)
832 *
833 * Purpose : initializes *instance and corresponding 5380 chip.
834 *
835 * Inputs : instance - instantiation of the 5380 driver.
836 *
837 * Notes : I assume that the host, hostno, and id bits have been
838 * set correctly. I don't care about the irq and other fields.
839 *
840 */
841
842static int NCR5380_init (struct Scsi_Host *instance, int flags)
843{
844 int i;
845 SETUP_HOSTDATA(instance);
846
847 NCR5380_all_init();
848
849 hostdata->aborted = 0;
850 hostdata->id_mask = 1 << instance->this_id;
851 hostdata->id_higher_mask = 0;
852 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
853 if (i > hostdata->id_mask)
854 hostdata->id_higher_mask |= i;
855 for (i = 0; i < 8; ++i)
856 hostdata->busy[i] = 0;
857#ifdef SUPPORT_TAGS
858 init_tags();
859#endif
860#if defined (REAL_DMA)
861 hostdata->dma_len = 0;
862#endif
863 hostdata->targets_present = 0;
864 hostdata->connected = NULL;
865 hostdata->issue_queue = NULL;
866 hostdata->disconnected_queue = NULL;
867 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
868
869 if (!the_template) {
870 the_template = instance->hostt;
871 first_instance = instance;
872 }
873
874
875#ifndef AUTOSENSE
876 if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1))
877 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
878 " without AUTOSENSE option, contingent allegiance conditions may\n"
879 " be incorrectly cleared.\n", HOSTNO);
880#endif /* def AUTOSENSE */
881
882 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
883 NCR5380_write(MODE_REG, MR_BASE);
884 NCR5380_write(TARGET_COMMAND_REG, 0);
885 NCR5380_write(SELECT_ENABLE_REG, 0);
886
887 return 0;
888}
889
890/*
891 * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd,
892 * void (*done)(Scsi_Cmnd *))
893 *
894 * Purpose : enqueues a SCSI command
895 *
896 * Inputs : cmd - SCSI command, done - function called on completion, with
897 * a pointer to the command descriptor.
898 *
899 * Returns : 0
900 *
901 * Side effects :
902 * cmd is added to the per instance issue_queue, with minor
903 * twiddling done to the host specific fields of cmd. If the
904 * main coroutine is not running, it is restarted.
905 *
906 */
907
908/* Only make static if a wrapper function is used */
909static int NCR5380_queue_command (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
910{
911 SETUP_HOSTDATA(cmd->device->host);
912 Scsi_Cmnd *tmp;
913 unsigned long flags;
914
915#if (NDEBUG & NDEBUG_NO_WRITE)
916 switch (cmd->cmnd[0]) {
917 case WRITE_6:
918 case WRITE_10:
919 printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
920 H_NO(cmd));
921 cmd->result = (DID_ERROR << 16);
922 done(cmd);
923 return 0;
924 }
925#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
926
927
928#ifdef NCR5380_STATS
929# if 0
930 if (!hostdata->connected && !hostdata->issue_queue &&
931 !hostdata->disconnected_queue) {
932 hostdata->timebase = jiffies;
933 }
934# endif
935# ifdef NCR5380_STAT_LIMIT
936 if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
937# endif
938 switch (cmd->cmnd[0])
939 {
940 case WRITE:
941 case WRITE_6:
942 case WRITE_10:
943 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
944 hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;
945 hostdata->pendingw++;
946 break;
947 case READ:
948 case READ_6:
949 case READ_10:
950 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
951 hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;
952 hostdata->pendingr++;
953 break;
954 }
955#endif
956
957 /*
958 * We use the host_scribble field as a pointer to the next command
959 * in a queue
960 */
961
962 NEXT(cmd) = NULL;
963 cmd->scsi_done = done;
964
965 cmd->result = 0;
966
967
968 /*
969 * Insert the cmd into the issue queue. Note that REQUEST SENSE
970 * commands are added to the head of the queue since any command will
971 * clear the contingent allegiance condition that exists and the
972 * sense data is only guaranteed to be valid while the condition exists.
973 */
974
975 local_irq_save(flags);
976 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
977 * Otherwise a running NCR5380_main may steal the lock.
978 * Lock before actually inserting due to fairness reasons explained in
979 * atari_scsi.c. If we insert first, then it's impossible for this driver
980 * to release the lock.
981 * Stop timer for this command while waiting for the lock, or timeouts
982 * may happen (and they really do), and it's no good if the command doesn't
983 * appear in any of the queues.
984 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
985 * because also a timer int can trigger an abort or reset, which would
986 * alter queues and touch the lock.
987 */
988 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
989 LIST(cmd, hostdata->issue_queue);
990 NEXT(cmd) = hostdata->issue_queue;
991 hostdata->issue_queue = cmd;
992 } else {
993 for (tmp = (Scsi_Cmnd *)hostdata->issue_queue;
994 NEXT(tmp); tmp = NEXT(tmp))
995 ;
996 LIST(cmd, tmp);
997 NEXT(tmp) = cmd;
998 }
999
1000 local_irq_restore(flags);
1001
1002 QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd),
1003 (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
1004
1005 /* If queue_command() is called from an interrupt (real one or bottom
1006 * half), we let queue_main() do the job of taking care about main. If it
1007 * is already running, this is a no-op, else main will be queued.
1008 *
1009 * If we're not in an interrupt, we can call NCR5380_main()
1010 * unconditionally, because it cannot be already running.
1011 */
1012 if (in_interrupt() || ((flags >> 8) & 7) >= 6)
1013 queue_main();
1014 else
1015 NCR5380_main(NULL);
1016 return 0;
1017}
1018
1019/*
1020 * Function : NCR5380_main (void)
1021 *
1022 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1023 * be done on the NCR5380 host adapters in a system. Both
1024 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1025 * in case it is not running.
1026 *
1027 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
1028 * reenable them. This prevents reentrancy and kernel stack overflow.
1029 */
1030
1031static void NCR5380_main (void *bl)
1032{
1033 Scsi_Cmnd *tmp, *prev;
1034 struct Scsi_Host *instance = first_instance;
1035 struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
1036 int done;
1037 unsigned long flags;
1038
1039 /*
1040 * We run (with interrupts disabled) until we're sure that none of
1041 * the host adapters have anything that can be done, at which point
1042 * we set main_running to 0 and exit.
1043 *
1044 * Interrupts are enabled before doing various other internal
1045 * instructions, after we've decided that we need to run through
1046 * the loop again.
1047 *
1048 * this should prevent any race conditions.
1049 *
1050 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1051 * because also a timer int can trigger an abort or reset, which can
1052 * alter queues and touch the Falcon lock.
1053 */
1054
1055 /* Tell int handlers main() is now already executing. Note that
1056 no races are possible here. If an int comes in before
1057 'main_running' is set here, and queues/executes main via the
1058 task queue, it doesn't do any harm, just this instance of main
1059 won't find any work left to do. */
1060 if (main_running)
1061 return;
1062 main_running = 1;
1063
1064 local_save_flags(flags);
1065 do {
1066 local_irq_disable(); /* Freeze request queues */
1067 done = 1;
1068
1069 if (!hostdata->connected) {
1070 MAIN_PRINTK( "scsi%d: not connected\n", HOSTNO );
1071 /*
1072 * Search through the issue_queue for a command destined
1073 * for a target that's not busy.
1074 */
1075#if (NDEBUG & NDEBUG_LISTS)
1076 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL;
1077 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1078 ;
1079 if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/
1080#endif
1081 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue,
1082 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) {
1083
1084#if (NDEBUG & NDEBUG_LISTS)
1085 if (prev != tmp)
1086 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
1087 tmp, tmp->target, hostdata->busy[tmp->target],
1088 tmp->lun);
1089#endif
1090 /* When we find one, remove it from the issue queue. */
1091 /* ++guenther: possible race with Falcon locking */
1092 if (
1093#ifdef SUPPORT_TAGS
1094 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
1095#else
1096 !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))
1097#endif
1098 ) {
1099 /* ++guenther: just to be sure, this must be atomic */
1100 local_irq_disable();
1101 if (prev) {
1102 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
1103 NEXT(prev) = NEXT(tmp);
1104 } else {
1105 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1106 hostdata->issue_queue = NEXT(tmp);
1107 }
1108 NEXT(tmp) = NULL;
1109
1110 /* reenable interrupts after finding one */
1111 local_irq_restore(flags);
1112
1113 /*
1114 * Attempt to establish an I_T_L nexus here.
1115 * On success, instance->hostdata->connected is set.
1116 * On failure, we must add the command back to the
1117 * issue queue so we can keep trying.
1118 */
1119 MAIN_PRINTK("scsi%d: main(): command for target %d "
1120 "lun %d removed from issue_queue\n",
1121 HOSTNO, tmp->target, tmp->lun);
1122 /*
1123 * REQUEST SENSE commands are issued without tagged
1124 * queueing, even on SCSI-II devices because the
1125 * contingent allegiance condition exists for the
1126 * entire unit.
1127 */
1128 /* ++roman: ...and the standard also requires that
1129 * REQUEST SENSE command are untagged.
1130 */
1131
1132#ifdef SUPPORT_TAGS
1133 cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE );
1134#endif
1135 if (!NCR5380_select(instance, tmp,
1136 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
1137 TAG_NEXT)) {
1138 break;
1139 } else {
1140 local_irq_disable();
1141 LIST(tmp, hostdata->issue_queue);
1142 NEXT(tmp) = hostdata->issue_queue;
1143 hostdata->issue_queue = tmp;
1144#ifdef SUPPORT_TAGS
1145 cmd_free_tag( tmp );
1146#endif
1147 local_irq_restore(flags);
1148 MAIN_PRINTK("scsi%d: main(): select() failed, "
1149 "returned to issue_queue\n", HOSTNO);
1150 if (hostdata->connected)
1151 break;
1152 }
1153 } /* if target/lun/target queue is not busy */
1154 } /* for issue_queue */
1155 } /* if (!hostdata->connected) */
1156 if (hostdata->connected
1157#ifdef REAL_DMA
1158 && !hostdata->dma_len
1159#endif
1160 ) {
1161 local_irq_restore(flags);
1162 MAIN_PRINTK("scsi%d: main: performing information transfer\n",
1163 HOSTNO);
1164 NCR5380_information_transfer(instance);
1165 MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
1166 done = 0;
1167 }
1168 } while (!done);
1169
1170 /* Better allow ints _after_ 'main_running' has been cleared, else
1171 an interrupt could believe we'll pick up the work it left for
1172 us, but we won't see it anymore here... */
1173 main_running = 0;
1174 local_irq_restore(flags);
1175}
1176
1177
1178#ifdef REAL_DMA
1179/*
1180 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1181 *
1182 * Purpose : Called by interrupt handler when DMA finishes or a phase
1183 * mismatch occurs (which would finish the DMA transfer).
1184 *
1185 * Inputs : instance - this instance of the NCR5380.
1186 *
1187 */
1188
1189static void NCR5380_dma_complete( struct Scsi_Host *instance )
1190{
1191 SETUP_HOSTDATA(instance);
1192 int transfered;
1193 unsigned char **data;
1194 volatile int *count;
1195
1196 if (!hostdata->connected) {
1197 printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
1198 "no connected cmd\n", HOSTNO);
1199 return;
1200 }
1201
1202 DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1203 HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
1204 NCR5380_read(STATUS_REG));
1205
1206 if((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) {
1207 printk("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", HOSTNO);
1208 printk("please e-mail sammy@sammy.net with a description of how this\n");
1209 printk("error was produced.\n");
1210 BUG();
1211 }
1212
1213 /* make sure we're not stuck in a data phase */
1214 if((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH |
1215 BASR_ACK)) ==
1216 (BASR_PHASE_MATCH | BASR_ACK)) {
1217 printk("scsi%d: BASR %02x\n", HOSTNO, NCR5380_read(BUS_AND_STATUS_REG));
1218 printk("scsi%d: bus stuck in data phase -- probably a single byte "
1219 "overrun!\n", HOSTNO);
1220 printk("not prepared for this error!\n");
1221 printk("please e-mail sammy@sammy.net with a description of how this\n");
1222 printk("error was produced.\n");
1223 BUG();
1224 }
1225
1226
1227
1228 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1229 NCR5380_write(MODE_REG, MR_BASE);
1230 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1231
1232 transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
1233 hostdata->dma_len = 0;
1234
1235 data = (unsigned char **) &(hostdata->connected->SCp.ptr);
1236 count = &(hostdata->connected->SCp.this_residual);
1237 *data += transfered;
1238 *count -= transfered;
1239
1240}
1241#endif /* REAL_DMA */
1242
1243
1244/*
1245 * Function : void NCR5380_intr (int irq)
1246 *
1247 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1248 * from the disconnected queue, and restarting NCR5380_main()
1249 * as required.
1250 *
1251 * Inputs : int irq, irq that caused this interrupt.
1252 *
1253 */
1254
1255static irqreturn_t NCR5380_intr (int irq, void *dev_id, struct pt_regs *regs)
1256{
1257 struct Scsi_Host *instance = first_instance;
1258 int done = 1, handled = 0;
1259 unsigned char basr;
1260
1261 INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
1262
1263 /* Look for pending interrupts */
1264 basr = NCR5380_read(BUS_AND_STATUS_REG);
1265 INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
1266 /* dispatch to appropriate routine if found and done=0 */
1267 if (basr & BASR_IRQ) {
1268 NCR_PRINT(NDEBUG_INTR);
1269 if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
1270 done = 0;
1271 ENABLE_IRQ();
1272 INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
1273 NCR5380_reselect(instance);
1274 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1275 }
1276 else if (basr & BASR_PARITY_ERROR) {
1277 INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
1278 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1279 }
1280 else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1281 INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
1282 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1283 }
1284 else {
1285 /*
1286 * The rest of the interrupt conditions can occur only during a
1287 * DMA transfer
1288 */
1289
1290#if defined(REAL_DMA)
1291 /*
1292 * We should only get PHASE MISMATCH and EOP interrupts if we have
1293 * DMA enabled, so do a sanity check based on the current setting
1294 * of the MODE register.
1295 */
1296
1297 if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
1298 ((basr & BASR_END_DMA_TRANSFER) ||
1299 !(basr & BASR_PHASE_MATCH))) {
1300
1301 INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
1302 NCR5380_dma_complete( instance );
1303 done = 0;
1304 ENABLE_IRQ();
1305 } else
1306#endif /* REAL_DMA */
1307 {
1308/* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1309 if (basr & BASR_PHASE_MATCH)
1310 INT_PRINTK("scsi%d: unknown interrupt, "
1311 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1312 HOSTNO, basr, NCR5380_read(MODE_REG),
1313 NCR5380_read(STATUS_REG));
1314 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1315#ifdef SUN3_SCSI_VME
1316 dregs->csr |= CSR_DMA_ENABLE;
1317#endif
1318 }
1319 } /* if !(SELECTION || PARITY) */
1320 handled = 1;
1321 } /* BASR & IRQ */
1322 else {
1323
1324 printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
1325 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
1326 NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
1327 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1328#ifdef SUN3_SCSI_VME
1329 dregs->csr |= CSR_DMA_ENABLE;
1330#endif
1331 }
1332
1333 if (!done) {
1334 INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
1335 /* Put a call to NCR5380_main() on the queue... */
1336 queue_main();
1337 }
1338 return IRQ_RETVAL(handled);
1339}
1340
1341#ifdef NCR5380_STATS
1342static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd* cmd)
1343{
1344# ifdef NCR5380_STAT_LIMIT
1345 if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
1346# endif
1347 switch (cmd->cmnd[0])
1348 {
1349 case WRITE:
1350 case WRITE_6:
1351 case WRITE_10:
1352 hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
1353 /*hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;*/
1354 hostdata->pendingw--;
1355 break;
1356 case READ:
1357 case READ_6:
1358 case READ_10:
1359 hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
1360 /*hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;*/
1361 hostdata->pendingr--;
1362 break;
1363 }
1364}
1365#endif
1366
1367/*
1368 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
1369 * int tag);
1370 *
1371 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1372 * including ARBITRATION, SELECTION, and initial message out for
1373 * IDENTIFY and queue messages.
1374 *
1375 * Inputs : instance - instantiation of the 5380 driver on which this
1376 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1377 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1378 * the command that is presently connected.
1379 *
1380 * Returns : -1 if selection could not execute for some reason,
1381 * 0 if selection succeeded or failed because the target
1382 * did not respond.
1383 *
1384 * Side effects :
1385 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1386 * with registers as they should have been on entry - ie
1387 * SELECT_ENABLE will be set appropriately, the NCR5380
1388 * will cease to drive any SCSI bus signals.
1389 *
1390 * If successful : I_T_L or I_T_L_Q nexus will be established,
1391 * instance->connected will be set to cmd.
1392 * SELECT interrupt will be disabled.
1393 *
1394 * If failed (no target) : cmd->scsi_done() will be called, and the
1395 * cmd->result host byte set to DID_BAD_TARGET.
1396 */
1397
1398static int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, int tag)
1399{
1400 SETUP_HOSTDATA(instance);
1401 unsigned char tmp[3], phase;
1402 unsigned char *data;
1403 int len;
1404 unsigned long timeout;
1405 unsigned long flags;
1406
1407 hostdata->restart_select = 0;
1408 NCR_PRINT(NDEBUG_ARBITRATION);
1409 ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO,
1410 instance->this_id);
1411
1412 /*
1413 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1414 * data bus during SELECTION.
1415 */
1416
1417 local_irq_save(flags);
1418 if (hostdata->connected) {
1419 local_irq_restore(flags);
1420 return -1;
1421 }
1422 NCR5380_write(TARGET_COMMAND_REG, 0);
1423
1424
1425 /*
1426 * Start arbitration.
1427 */
1428
1429 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1430 NCR5380_write(MODE_REG, MR_ARBITRATE);
1431
1432 local_irq_restore(flags);
1433
1434 /* Wait for arbitration logic to complete */
1435#if NCR_TIMEOUT
1436 {
1437 unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
1438
1439 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1440 && time_before(jiffies, timeout) && !hostdata->connected)
1441 ;
1442 if (time_after_eq(jiffies, timeout))
1443 {
1444 printk("scsi : arbitration timeout at %d\n", __LINE__);
1445 NCR5380_write(MODE_REG, MR_BASE);
1446 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1447 return -1;
1448 }
1449 }
1450#else /* NCR_TIMEOUT */
1451 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1452 && !hostdata->connected);
1453#endif
1454
1455 ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
1456
1457 if (hostdata->connected) {
1458 NCR5380_write(MODE_REG, MR_BASE);
1459 return -1;
1460 }
1461 /*
1462 * The arbitration delay is 2.2us, but this is a minimum and there is
1463 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1464 * the integral nature of udelay().
1465 *
1466 */
1467
1468 udelay(3);
1469
1470 /* Check for lost arbitration */
1471 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1472 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1473 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1474 hostdata->connected) {
1475 NCR5380_write(MODE_REG, MR_BASE);
1476 ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1477 HOSTNO);
1478 return -1;
1479 }
1480
1481 /* after/during arbitration, BSY should be asserted.
1482 IBM DPES-31080 Version S31Q works now */
1483 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1484 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL |
1485 ICR_ASSERT_BSY ) ;
1486
1487 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1488 hostdata->connected) {
1489 NCR5380_write(MODE_REG, MR_BASE);
1490 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1491 ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1492 HOSTNO);
1493 return -1;
1494 }
1495
1496 /*
1497 * Again, bus clear + bus settle time is 1.2us, however, this is
1498 * a minimum so we'll udelay ceil(1.2)
1499 */
1500
1501#ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1502 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1503 udelay(15);
1504#else
1505 udelay(2);
1506#endif
1507
1508 if (hostdata->connected) {
1509 NCR5380_write(MODE_REG, MR_BASE);
1510 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1511 return -1;
1512 }
1513
1514 ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
1515
1516 /*
1517 * Now that we have won arbitration, start Selection process, asserting
1518 * the host and target ID's on the SCSI bus.
1519 */
1520
1521 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
1522
1523 /*
1524 * Raise ATN while SEL is true before BSY goes false from arbitration,
1525 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1526 * phase immediately after selection.
1527 */
1528
1529 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
1530 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
1531 NCR5380_write(MODE_REG, MR_BASE);
1532
1533 /*
1534 * Reselect interrupts must be turned off prior to the dropping of BSY,
1535 * otherwise we will trigger an interrupt.
1536 */
1537
1538 if (hostdata->connected) {
1539 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1540 return -1;
1541 }
1542
1543 NCR5380_write(SELECT_ENABLE_REG, 0);
1544
1545 /*
1546 * The initiator shall then wait at least two deskew delays and release
1547 * the BSY signal.
1548 */
1549 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1550
1551 /* Reset BSY */
1552 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
1553 ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1554
1555 /*
1556 * Something weird happens when we cease to drive BSY - looks
1557 * like the board/chip is letting us do another read before the
1558 * appropriate propagation delay has expired, and we're confusing
1559 * a BSY signal from ourselves as the target's response to SELECTION.
1560 *
1561 * A small delay (the 'C++' frontend breaks the pipeline with an
1562 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1563 * tighter 'C' code breaks and requires this) solves the problem -
1564 * the 1 us delay is arbitrary, and only used because this delay will
1565 * be the same on other platforms and since it works here, it should
1566 * work there.
1567 *
1568 * wingel suggests that this could be due to failing to wait
1569 * one deskew delay.
1570 */
1571
1572 udelay(1);
1573
1574 SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
1575
1576 /*
1577 * The SCSI specification calls for a 250 ms timeout for the actual
1578 * selection.
1579 */
1580
1581 timeout = jiffies + 25;
1582
1583 /*
1584 * XXX very interesting - we're seeing a bounce where the BSY we
1585 * asserted is being reflected / still asserted (propagation delay?)
1586 * and it's detecting as true. Sigh.
1587 */
1588
1589#if 0
1590 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1591 * IO while SEL is true. But again, there are some disks out the in the
1592 * world that do that nevertheless. (Somebody claimed that this announces
1593 * reselection capability of the target.) So we better skip that test and
1594 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
1595 */
1596
1597 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) &
1598 (SR_BSY | SR_IO)));
1599
1600 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) ==
1601 (SR_SEL | SR_IO)) {
1602 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1603 NCR5380_reselect(instance);
1604 printk (KERN_ERR "scsi%d: reselection after won arbitration?\n",
1605 HOSTNO);
1606 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1607 return -1;
1608 }
1609#else
1610 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY));
1611#endif
1612
1613 /*
1614 * No less than two deskew delays after the initiator detects the
1615 * BSY signal is true, it shall release the SEL signal and may
1616 * change the DATA BUS. -wingel
1617 */
1618
1619 udelay(1);
1620
1621 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1622
1623 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1624 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1625 if (hostdata->targets_present & (1 << cmd->device->id)) {
1626 printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
1627 if (hostdata->restart_select)
1628 printk(KERN_NOTICE "\trestart select\n");
1629 NCR_PRINT(NDEBUG_ANY);
1630 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1631 return -1;
1632 }
1633 cmd->result = DID_BAD_TARGET << 16;
1634#ifdef NCR5380_STATS
1635 collect_stats(hostdata, cmd);
1636#endif
1637#ifdef SUPPORT_TAGS
1638 cmd_free_tag( cmd );
1639#endif
1640 cmd->scsi_done(cmd);
1641 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1642 SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
1643 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1644 return 0;
1645 }
1646
1647 hostdata->targets_present |= (1 << cmd->device->id);
1648
1649 /*
1650 * Since we followed the SCSI spec, and raised ATN while SEL
1651 * was true but before BSY was false during selection, the information
1652 * transfer phase should be a MESSAGE OUT phase so that we can send the
1653 * IDENTIFY message.
1654 *
1655 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1656 * message (2 bytes) with a tag ID that we increment with every command
1657 * until it wraps back to 0.
1658 *
1659 * XXX - it turns out that there are some broken SCSI-II devices,
1660 * which claim to support tagged queuing but fail when more than
1661 * some number of commands are issued at once.
1662 */
1663
1664 /* Wait for start of REQ/ACK handshake */
1665 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
1666
1667 SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1668 HOSTNO, cmd->device->id);
1669 tmp[0] = IDENTIFY(1, cmd->device->lun);
1670
1671#ifdef SUPPORT_TAGS
1672 if (cmd->tag != TAG_NONE) {
1673 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1674 tmp[2] = cmd->tag;
1675 len = 3;
1676 } else
1677 len = 1;
1678#else
1679 len = 1;
1680 cmd->tag=0;
1681#endif /* SUPPORT_TAGS */
1682
1683 /* Send message(s) */
1684 data = tmp;
1685 phase = PHASE_MSGOUT;
1686 NCR5380_transfer_pio(instance, &phase, &len, &data);
1687 SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
1688 /* XXX need to handle errors here */
1689 hostdata->connected = cmd;
1690#ifndef SUPPORT_TAGS
1691 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1692#endif
1693#ifdef SUN3_SCSI_VME
1694 dregs->csr |= CSR_INTR;
1695#endif
1696 initialize_SCp(cmd);
1697
1698
1699 return 0;
1700}
1701
1702/*
1703 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1704 * unsigned char *phase, int *count, unsigned char **data)
1705 *
1706 * Purpose : transfers data in given phase using polled I/O
1707 *
1708 * Inputs : instance - instance of driver, *phase - pointer to
1709 * what phase is expected, *count - pointer to number of
1710 * bytes to transfer, **data - pointer to data pointer.
1711 *
1712 * Returns : -1 when different phase is entered without transferring
1713 * maximum number of bytes, 0 if all bytes are transfered or exit
1714 * is in same phase.
1715 *
1716 * Also, *phase, *count, *data are modified in place.
1717 *
1718 * XXX Note : handling for bus free may be useful.
1719 */
1720
1721/*
1722 * Note : this code is not as quick as it could be, however it
1723 * IS 100% reliable, and for the actual data transfer where speed
1724 * counts, we will always do a pseudo DMA or DMA transfer.
1725 */
1726
1727static int NCR5380_transfer_pio( struct Scsi_Host *instance,
1728 unsigned char *phase, int *count,
1729 unsigned char **data)
1730{
1731 register unsigned char p = *phase, tmp;
1732 register int c = *count;
1733 register unsigned char *d = *data;
1734
1735 /*
1736 * The NCR5380 chip will only drive the SCSI bus when the
1737 * phase specified in the appropriate bits of the TARGET COMMAND
1738 * REGISTER match the STATUS REGISTER
1739 */
1740
1741 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1742
1743 do {
1744 /*
1745 * Wait for assertion of REQ, after which the phase bits will be
1746 * valid
1747 */
1748 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
1749
1750 HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
1751
1752 /* Check for phase mismatch */
1753 if ((tmp & PHASE_MASK) != p) {
1754 PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
1755 NCR_PRINT_PHASE(NDEBUG_PIO);
1756 break;
1757 }
1758
1759 /* Do actual transfer from SCSI bus to / from memory */
1760 if (!(p & SR_IO))
1761 NCR5380_write(OUTPUT_DATA_REG, *d);
1762 else
1763 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1764
1765 ++d;
1766
1767 /*
1768 * The SCSI standard suggests that in MSGOUT phase, the initiator
1769 * should drop ATN on the last byte of the message phase
1770 * after REQ has been asserted for the handshake but before
1771 * the initiator raises ACK.
1772 */
1773
1774 if (!(p & SR_IO)) {
1775 if (!((p & SR_MSG) && c > 1)) {
1776 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1777 ICR_ASSERT_DATA);
1778 NCR_PRINT(NDEBUG_PIO);
1779 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1780 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1781 } else {
1782 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1783 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1784 NCR_PRINT(NDEBUG_PIO);
1785 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1786 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1787 }
1788 } else {
1789 NCR_PRINT(NDEBUG_PIO);
1790 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1791 }
1792
1793 while (NCR5380_read(STATUS_REG) & SR_REQ);
1794
1795 HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
1796
1797/*
1798 * We have several special cases to consider during REQ/ACK handshaking :
1799 * 1. We were in MSGOUT phase, and we are on the last byte of the
1800 * message. ATN must be dropped as ACK is dropped.
1801 *
1802 * 2. We are in a MSGIN phase, and we are on the last byte of the
1803 * message. We must exit with ACK asserted, so that the calling
1804 * code may raise ATN before dropping ACK to reject the message.
1805 *
1806 * 3. ACK and ATN are clear and the target may proceed as normal.
1807 */
1808 if (!(p == PHASE_MSGIN && c == 1)) {
1809 if (p == PHASE_MSGOUT && c > 1)
1810 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1811 else
1812 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1813 }
1814 } while (--c);
1815
1816 PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
1817
1818 *count = c;
1819 *data = d;
1820 tmp = NCR5380_read(STATUS_REG);
1821 /* The phase read from the bus is valid if either REQ is (already)
1822 * asserted or if ACK hasn't been released yet. The latter is the case if
1823 * we're in MSGIN and all wanted bytes have been received. */
1824 if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
1825 *phase = tmp & PHASE_MASK;
1826 else
1827 *phase = PHASE_UNKNOWN;
1828
1829 if (!c || (*phase == p))
1830 return 0;
1831 else
1832 return -1;
1833}
1834
1835/*
1836 * Function : do_abort (Scsi_Host *host)
1837 *
1838 * Purpose : abort the currently established nexus. Should only be
1839 * called from a routine which can drop into a
1840 *
1841 * Returns : 0 on success, -1 on failure.
1842 */
1843
1844static int do_abort (struct Scsi_Host *host)
1845{
1846 unsigned char tmp, *msgptr, phase;
1847 int len;
1848
1849 /* Request message out phase */
1850 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1851
1852 /*
1853 * Wait for the target to indicate a valid phase by asserting
1854 * REQ. Once this happens, we'll have either a MSGOUT phase
1855 * and can immediately send the ABORT message, or we'll have some
1856 * other phase and will have to source/sink data.
1857 *
1858 * We really don't care what value was on the bus or what value
1859 * the target sees, so we just handshake.
1860 */
1861
1862 while (!(tmp = NCR5380_read(STATUS_REG)) & SR_REQ);
1863
1864 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1865
1866 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1867 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1868 ICR_ASSERT_ACK);
1869 while (NCR5380_read(STATUS_REG) & SR_REQ);
1870 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1871 }
1872
1873 tmp = ABORT;
1874 msgptr = &tmp;
1875 len = 1;
1876 phase = PHASE_MSGOUT;
1877 NCR5380_transfer_pio (host, &phase, &len, &msgptr);
1878
1879 /*
1880 * If we got here, and the command completed successfully,
1881 * we're about to go into bus free state.
1882 */
1883
1884 return len ? -1 : 0;
1885}
1886
1887#if defined(REAL_DMA)
1888/*
1889 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1890 * unsigned char *phase, int *count, unsigned char **data)
1891 *
1892 * Purpose : transfers data in given phase using either real
1893 * or pseudo DMA.
1894 *
1895 * Inputs : instance - instance of driver, *phase - pointer to
1896 * what phase is expected, *count - pointer to number of
1897 * bytes to transfer, **data - pointer to data pointer.
1898 *
1899 * Returns : -1 when different phase is entered without transferring
1900 * maximum number of bytes, 0 if all bytes or transfered or exit
1901 * is in same phase.
1902 *
1903 * Also, *phase, *count, *data are modified in place.
1904 *
1905 */
1906
1907
1908static int NCR5380_transfer_dma( struct Scsi_Host *instance,
1909 unsigned char *phase, int *count,
1910 unsigned char **data)
1911{
1912 SETUP_HOSTDATA(instance);
1913 register int c = *count;
1914 register unsigned char p = *phase;
1915 unsigned long flags;
1916
1917 /* sanity check */
1918 if(!sun3_dma_setup_done) {
1919 printk("scsi%d: transfer_dma without setup!\n", HOSTNO);
1920 BUG();
1921 }
1922 hostdata->dma_len = c;
1923
1924 DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1925 HOSTNO, (p & SR_IO) ? "reading" : "writing",
1926 c, (p & SR_IO) ? "to" : "from", *data);
1927
1928 /* netbsd turns off ints here, why not be safe and do it too */
1929 local_irq_save(flags);
1930
1931 /* send start chain */
1932 sun3scsi_dma_start(c, *data);
1933
1934 if (p & SR_IO) {
1935 NCR5380_write(TARGET_COMMAND_REG, 1);
1936 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1937 NCR5380_write(INITIATOR_COMMAND_REG, 0);
1938 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1939 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1940 } else {
1941 NCR5380_write(TARGET_COMMAND_REG, 0);
1942 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1943 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA);
1944 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1945 NCR5380_write(START_DMA_SEND_REG, 0);
1946 }
1947
1948#ifdef SUN3_SCSI_VME
1949 dregs->csr |= CSR_DMA_ENABLE;
1950#endif
1951
1952 local_irq_restore(flags);
1953
1954 sun3_dma_active = 1;
1955 return 0;
1956}
1957#endif /* defined(REAL_DMA) */
1958
1959/*
1960 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1961 *
1962 * Purpose : run through the various SCSI phases and do as the target
1963 * directs us to. Operates on the currently connected command,
1964 * instance->connected.
1965 *
1966 * Inputs : instance, instance for which we are doing commands
1967 *
1968 * Side effects : SCSI things happen, the disconnected queue will be
1969 * modified if a command disconnects, *instance->connected will
1970 * change.
1971 *
1972 * XXX Note : we need to watch for bus free or a reset condition here
1973 * to recover from an unexpected bus free condition.
1974 */
1975
1976static void NCR5380_information_transfer (struct Scsi_Host *instance)
1977{
1978 SETUP_HOSTDATA(instance);
1979 unsigned long flags;
1980 unsigned char msgout = NOP;
1981 int sink = 0;
1982 int len;
1983#if defined(REAL_DMA)
1984 int transfersize;
1985#endif
1986 unsigned char *data;
1987 unsigned char phase, tmp, extended_msg[10], old_phase=0xff;
1988 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
1989
1990#ifdef SUN3_SCSI_VME
1991 dregs->csr |= CSR_INTR;
1992#endif
1993
1994 while (1) {
1995 tmp = NCR5380_read(STATUS_REG);
1996 /* We only have a valid SCSI phase when REQ is asserted */
1997 if (tmp & SR_REQ) {
1998 phase = (tmp & PHASE_MASK);
1999 if (phase != old_phase) {
2000 old_phase = phase;
2001 NCR_PRINT_PHASE(NDEBUG_INFORMATION);
2002 }
2003
2004 if(phase == PHASE_CMDOUT) {
2005 void *d;
2006 unsigned long count;
2007
2008 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2009 count = cmd->SCp.buffer->length;
2010 d = SGADDR(cmd->SCp.buffer);
2011 } else {
2012 count = cmd->SCp.this_residual;
2013 d = cmd->SCp.ptr;
2014 }
2015#ifdef REAL_DMA
2016 /* this command setup for dma yet? */
2017 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done
2018 != cmd))
2019 {
2020 if(cmd->request->flags & REQ_CMD) {
2021 sun3scsi_dma_setup(d, count,
2022 rq_data_dir(cmd->request));
2023 sun3_dma_setup_done = cmd;
2024 }
2025 }
2026#endif
2027#ifdef SUN3_SCSI_VME
2028 dregs->csr |= CSR_INTR;
2029#endif
2030 }
2031
2032
2033 if (sink && (phase != PHASE_MSGOUT)) {
2034 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2035
2036 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
2037 ICR_ASSERT_ACK);
2038 while (NCR5380_read(STATUS_REG) & SR_REQ);
2039 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2040 ICR_ASSERT_ATN);
2041 sink = 0;
2042 continue;
2043 }
2044
2045 switch (phase) {
2046 case PHASE_DATAOUT:
2047#if (NDEBUG & NDEBUG_NO_DATAOUT)
2048 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2049 "aborted\n", HOSTNO);
2050 sink = 1;
2051 do_abort(instance);
2052 cmd->result = DID_ERROR << 16;
2053 cmd->done(cmd);
2054 return;
2055#endif
2056 case PHASE_DATAIN:
2057 /*
2058 * If there is no room left in the current buffer in the
2059 * scatter-gather list, move onto the next one.
2060 */
2061 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2062 ++cmd->SCp.buffer;
2063 --cmd->SCp.buffers_residual;
2064 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2065 cmd->SCp.ptr = SGADDR(cmd->SCp.buffer);
2066
2067 /* ++roman: Try to merge some scatter-buffers if
2068 * they are at contiguous physical addresses.
2069 */
2070// merge_contiguous_buffers( cmd );
2071 INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
2072 HOSTNO, cmd->SCp.this_residual,
2073 cmd->SCp.buffers_residual);
2074 }
2075
2076 /*
2077 * The preferred transfer method is going to be
2078 * PSEUDO-DMA for systems that are strictly PIO,
2079 * since we can let the hardware do the handshaking.
2080 *
2081 * For this to work, we need to know the transfersize
2082 * ahead of time, since the pseudo-DMA code will sit
2083 * in an unconditional loop.
2084 */
2085
2086/* ++roman: I suggest, this should be
2087 * #if def(REAL_DMA)
2088 * instead of leaving REAL_DMA out.
2089 */
2090
2091#if defined(REAL_DMA)
2092// if (!cmd->device->borken &&
2093 if((transfersize =
2094 NCR5380_dma_xfer_len(instance,cmd,phase)) > SUN3_DMA_MINSIZE) {
2095 len = transfersize;
2096 cmd->SCp.phase = phase;
2097
2098 if (NCR5380_transfer_dma(instance, &phase,
2099 &len, (unsigned char **) &cmd->SCp.ptr)) {
2100 /*
2101 * If the watchdog timer fires, all future
2102 * accesses to this device will use the
2103 * polled-IO. */
2104 printk(KERN_NOTICE "scsi%d: switching target %d "
2105 "lun %d to slow handshake\n", HOSTNO,
2106 cmd->device->id, cmd->device->lun);
2107 cmd->device->borken = 1;
2108 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2109 ICR_ASSERT_ATN);
2110 sink = 1;
2111 do_abort(instance);
2112 cmd->result = DID_ERROR << 16;
2113 cmd->done(cmd);
2114 /* XXX - need to source or sink data here, as appropriate */
2115 } else {
2116#ifdef REAL_DMA
2117 /* ++roman: When using real DMA,
2118 * information_transfer() should return after
2119 * starting DMA since it has nothing more to
2120 * do.
2121 */
2122 return;
2123#else
2124 cmd->SCp.this_residual -= transfersize - len;
2125#endif
2126 }
2127 } else
2128#endif /* defined(REAL_DMA) */
2129 NCR5380_transfer_pio(instance, &phase,
2130 (int *) &cmd->SCp.this_residual, (unsigned char **)
2131 &cmd->SCp.ptr);
2132#ifdef REAL_DMA
2133 /* if we had intended to dma that command clear it */
2134 if(sun3_dma_setup_done == cmd)
2135 sun3_dma_setup_done = NULL;
2136#endif
2137
2138 break;
2139 case PHASE_MSGIN:
2140 len = 1;
2141 data = &tmp;
2142 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
2143 NCR5380_transfer_pio(instance, &phase, &len, &data);
2144 cmd->SCp.Message = tmp;
2145
2146 switch (tmp) {
2147 /*
2148 * Linking lets us reduce the time required to get the
2149 * next command out to the device, hopefully this will
2150 * mean we don't waste another revolution due to the delays
2151 * required by ARBITRATION and another SELECTION.
2152 *
2153 * In the current implementation proposal, low level drivers
2154 * merely have to start the next command, pointed to by
2155 * next_link, done() is called as with unlinked commands.
2156 */
2157#ifdef LINKED
2158 case LINKED_CMD_COMPLETE:
2159 case LINKED_FLG_CMD_COMPLETE:
2160 /* Accept message by clearing ACK */
2161 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2162
2163 LNK_PRINTK("scsi%d: target %d lun %d linked command "
2164 "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);
2165
2166 /* Enable reselect interrupts */
2167 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2168 /*
2169 * Sanity check : A linked command should only terminate
2170 * with one of these messages if there are more linked
2171 * commands available.
2172 */
2173
2174 if (!cmd->next_link) {
2175 printk(KERN_NOTICE "scsi%d: target %d lun %d "
2176 "linked command complete, no next_link\n",
2177 HOSTNO, cmd->device->id, cmd->device->lun);
2178 sink = 1;
2179 do_abort (instance);
2180 return;
2181 }
2182
2183 initialize_SCp(cmd->next_link);
2184 /* The next command is still part of this process; copy it
2185 * and don't free it! */
2186 cmd->next_link->tag = cmd->tag;
2187 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2188 LNK_PRINTK("scsi%d: target %d lun %d linked request "
2189 "done, calling scsi_done().\n",
2190 HOSTNO, cmd->device->id, cmd->device->lun);
2191#ifdef NCR5380_STATS
2192 collect_stats(hostdata, cmd);
2193#endif
2194 cmd->scsi_done(cmd);
2195 cmd = hostdata->connected;
2196 break;
2197#endif /* def LINKED */
2198 case ABORT:
2199 case COMMAND_COMPLETE:
2200 /* Accept message by clearing ACK */
2201 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2202 hostdata->connected = NULL;
2203 QU_PRINTK("scsi%d: command for target %d, lun %d "
2204 "completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
2205#ifdef SUPPORT_TAGS
2206 cmd_free_tag( cmd );
2207 if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
2208 /* Turn a QUEUE FULL status into BUSY, I think the
2209 * mid level cannot handle QUEUE FULL :-( (The
2210 * command is retried after BUSY). Also update our
2211 * queue size to the number of currently issued
2212 * commands now.
2213 */
2214 /* ++Andreas: the mid level code knows about
2215 QUEUE_FULL now. */
2216 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
2217 TAG_PRINTK("scsi%d: target %d lun %d returned "
2218 "QUEUE_FULL after %d commands\n",
2219 HOSTNO, cmd->device->id, cmd->device->lun,
2220 ta->nr_allocated);
2221 if (ta->queue_size > ta->nr_allocated)
2222 ta->nr_allocated = ta->queue_size;
2223 }
2224#else
2225 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2226#endif
2227 /* Enable reselect interrupts */
2228 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2229
2230 /*
2231 * I'm not sure what the correct thing to do here is :
2232 *
2233 * If the command that just executed is NOT a request
2234 * sense, the obvious thing to do is to set the result
2235 * code to the values of the stored parameters.
2236 *
2237 * If it was a REQUEST SENSE command, we need some way to
2238 * differentiate between the failure code of the original
2239 * and the failure code of the REQUEST sense - the obvious
2240 * case is success, where we fall through and leave the
2241 * result code unchanged.
2242 *
2243 * The non-obvious place is where the REQUEST SENSE failed
2244 */
2245
2246 if (cmd->cmnd[0] != REQUEST_SENSE)
2247 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2248 else if (status_byte(cmd->SCp.Status) != GOOD)
2249 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2250
2251#ifdef AUTOSENSE
2252 if ((cmd->cmnd[0] != REQUEST_SENSE) &&
2253 (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2254 ASEN_PRINTK("scsi%d: performing request sense\n",
2255 HOSTNO);
2256 cmd->cmnd[0] = REQUEST_SENSE;
2257 cmd->cmnd[1] &= 0xe0;
2258 cmd->cmnd[2] = 0;
2259 cmd->cmnd[3] = 0;
2260 cmd->cmnd[4] = sizeof(cmd->sense_buffer);
2261 cmd->cmnd[5] = 0;
2262 cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]);
2263
2264 cmd->use_sg = 0;
2265 /* this is initialized from initialize_SCp
2266 cmd->SCp.buffer = NULL;
2267 cmd->SCp.buffers_residual = 0;
2268 */
2269 cmd->request_buffer = (char *) cmd->sense_buffer;
2270 cmd->request_bufflen = sizeof(cmd->sense_buffer);
2271
2272 local_irq_save(flags);
2273 LIST(cmd,hostdata->issue_queue);
2274 NEXT(cmd) = hostdata->issue_queue;
2275 hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2276 local_irq_restore(flags);
2277 QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
2278 "issue queue\n", H_NO(cmd));
2279 } else
2280#endif /* def AUTOSENSE */
2281 {
2282#ifdef NCR5380_STATS
2283 collect_stats(hostdata, cmd);
2284#endif
2285 cmd->scsi_done(cmd);
2286 }
2287
2288 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2289 /*
2290 * Restore phase bits to 0 so an interrupted selection,
2291 * arbitration can resume.
2292 */
2293 NCR5380_write(TARGET_COMMAND_REG, 0);
2294
2295 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2296 barrier();
2297
2298 return;
2299 case MESSAGE_REJECT:
2300 /* Accept message by clearing ACK */
2301 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2302 /* Enable reselect interrupts */
2303 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2304 switch (hostdata->last_message) {
2305 case HEAD_OF_QUEUE_TAG:
2306 case ORDERED_QUEUE_TAG:
2307 case SIMPLE_QUEUE_TAG:
2308 /* The target obviously doesn't support tagged
2309 * queuing, even though it announced this ability in
2310 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2311 * clear 'tagged_supported' and lock the LUN, since
2312 * the command is treated as untagged further on.
2313 */
2314 cmd->device->tagged_supported = 0;
2315 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2316 cmd->tag = TAG_NONE;
2317 TAG_PRINTK("scsi%d: target %d lun %d rejected "
2318 "QUEUE_TAG message; tagged queuing "
2319 "disabled\n",
2320 HOSTNO, cmd->device->id, cmd->device->lun);
2321 break;
2322 }
2323 break;
2324 case DISCONNECT:
2325 /* Accept message by clearing ACK */
2326 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2327 local_irq_save(flags);
2328 cmd->device->disconnect = 1;
2329 LIST(cmd,hostdata->disconnected_queue);
2330 NEXT(cmd) = hostdata->disconnected_queue;
2331 hostdata->connected = NULL;
2332 hostdata->disconnected_queue = cmd;
2333 local_irq_restore(flags);
2334 QU_PRINTK("scsi%d: command for target %d lun %d was "
2335 "moved from connected to the "
2336 "disconnected_queue\n", HOSTNO,
2337 cmd->device->id, cmd->device->lun);
2338 /*
2339 * Restore phase bits to 0 so an interrupted selection,
2340 * arbitration can resume.
2341 */
2342 NCR5380_write(TARGET_COMMAND_REG, 0);
2343
2344 /* Enable reselect interrupts */
2345 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2346 /* Wait for bus free to avoid nasty timeouts */
2347 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2348 barrier();
2349#ifdef SUN3_SCSI_VME
2350 dregs->csr |= CSR_DMA_ENABLE;
2351#endif
2352 return;
2353 /*
2354 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2355 * operation, in violation of the SCSI spec so we can safely
2356 * ignore SAVE/RESTORE pointers calls.
2357 *
2358 * Unfortunately, some disks violate the SCSI spec and
2359 * don't issue the required SAVE_POINTERS message before
2360 * disconnecting, and we have to break spec to remain
2361 * compatible.
2362 */
2363 case SAVE_POINTERS:
2364 case RESTORE_POINTERS:
2365 /* Accept message by clearing ACK */
2366 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2367 /* Enable reselect interrupts */
2368 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2369 break;
2370 case EXTENDED_MESSAGE:
2371/*
2372 * Extended messages are sent in the following format :
2373 * Byte
2374 * 0 EXTENDED_MESSAGE == 1
2375 * 1 length (includes one byte for code, doesn't
2376 * include first two bytes)
2377 * 2 code
2378 * 3..length+1 arguments
2379 *
2380 * Start the extended message buffer with the EXTENDED_MESSAGE
db9dff32005-04-03 14:53:59 -05002381 * byte, since scsi_print_msg() wants the whole thing.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002382 */
2383 extended_msg[0] = EXTENDED_MESSAGE;
2384 /* Accept first byte by clearing ACK */
2385 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2386
2387 EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
2388
2389 len = 2;
2390 data = extended_msg + 1;
2391 phase = PHASE_MSGIN;
2392 NCR5380_transfer_pio(instance, &phase, &len, &data);
2393 EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2394 (int)extended_msg[1], (int)extended_msg[2]);
2395
2396 if (!len && extended_msg[1] <=
2397 (sizeof (extended_msg) - 1)) {
2398 /* Accept third byte by clearing ACK */
2399 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2400 len = extended_msg[1] - 1;
2401 data = extended_msg + 3;
2402 phase = PHASE_MSGIN;
2403
2404 NCR5380_transfer_pio(instance, &phase, &len, &data);
2405 EXT_PRINTK("scsi%d: message received, residual %d\n",
2406 HOSTNO, len);
2407
2408 switch (extended_msg[2]) {
2409 case EXTENDED_SDTR:
2410 case EXTENDED_WDTR:
2411 case EXTENDED_MODIFY_DATA_POINTER:
2412 case EXTENDED_EXTENDED_IDENTIFY:
2413 tmp = 0;
2414 }
2415 } else if (len) {
2416 printk(KERN_NOTICE "scsi%d: error receiving "
2417 "extended message\n", HOSTNO);
2418 tmp = 0;
2419 } else {
2420 printk(KERN_NOTICE "scsi%d: extended message "
2421 "code %02x length %d is too long\n",
2422 HOSTNO, extended_msg[2], extended_msg[1]);
2423 tmp = 0;
2424 }
2425 /* Fall through to reject message */
2426
2427 /*
2428 * If we get something weird that we aren't expecting,
2429 * reject it.
2430 */
2431 default:
2432 if (!tmp) {
2433 printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
db9dff32005-04-03 14:53:59 -05002434 scsi_print_msg (extended_msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002435 printk("\n");
2436 } else if (tmp != EXTENDED_MESSAGE)
2437 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2438 "message %02x from target %d, lun %d\n",
2439 HOSTNO, tmp, cmd->device->id, cmd->device->lun);
2440 else
2441 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2442 "extended message "
2443 "code %02x, length %d from target %d, lun %d\n",
2444 HOSTNO, extended_msg[1], extended_msg[0],
2445 cmd->device->id, cmd->device->lun);
2446
2447
2448 msgout = MESSAGE_REJECT;
2449 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2450 ICR_ASSERT_ATN);
2451 break;
2452 } /* switch (tmp) */
2453 break;
2454 case PHASE_MSGOUT:
2455 len = 1;
2456 data = &msgout;
2457 hostdata->last_message = msgout;
2458 NCR5380_transfer_pio(instance, &phase, &len, &data);
2459 if (msgout == ABORT) {
2460#ifdef SUPPORT_TAGS
2461 cmd_free_tag( cmd );
2462#else
2463 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2464#endif
2465 hostdata->connected = NULL;
2466 cmd->result = DID_ERROR << 16;
2467#ifdef NCR5380_STATS
2468 collect_stats(hostdata, cmd);
2469#endif
2470 cmd->scsi_done(cmd);
2471 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2472 return;
2473 }
2474 msgout = NOP;
2475 break;
2476 case PHASE_CMDOUT:
2477 len = cmd->cmd_len;
2478 data = cmd->cmnd;
2479 /*
2480 * XXX for performance reasons, on machines with a
2481 * PSEUDO-DMA architecture we should probably
2482 * use the dma transfer function.
2483 */
2484 NCR5380_transfer_pio(instance, &phase, &len,
2485 &data);
2486 break;
2487 case PHASE_STATIN:
2488 len = 1;
2489 data = &tmp;
2490 NCR5380_transfer_pio(instance, &phase, &len, &data);
2491 cmd->SCp.Status = tmp;
2492 break;
2493 default:
2494 printk("scsi%d: unknown phase\n", HOSTNO);
2495 NCR_PRINT(NDEBUG_ANY);
2496 } /* switch(phase) */
2497 } /* if (tmp * SR_REQ) */
2498 } /* while (1) */
2499}
2500
2501/*
2502 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2503 *
2504 * Purpose : does reselection, initializing the instance->connected
2505 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2506 * nexus has been reestablished,
2507 *
2508 * Inputs : instance - this instance of the NCR5380.
2509 *
2510 */
2511
2512/* it might eventually prove necessary to do a dma setup on
2513 reselection, but it doesn't seem to be needed now -- sam */
2514
2515static void NCR5380_reselect (struct Scsi_Host *instance)
2516{
2517 SETUP_HOSTDATA(instance);
2518 unsigned char target_mask;
2519 unsigned char lun;
2520#ifdef SUPPORT_TAGS
2521 unsigned char tag;
2522#endif
2523 unsigned char msg[3];
2524 Scsi_Cmnd *tmp = NULL, *prev;
2525/* unsigned long flags; */
2526
2527 /*
2528 * Disable arbitration, etc. since the host adapter obviously
2529 * lost, and tell an interrupted NCR5380_select() to restart.
2530 */
2531
2532 NCR5380_write(MODE_REG, MR_BASE);
2533 hostdata->restart_select = 1;
2534
2535 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2536
2537 RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
2538
2539 /*
2540 * At this point, we have detected that our SCSI ID is on the bus,
2541 * SEL is true and BSY was false for at least one bus settle delay
2542 * (400 ns).
2543 *
2544 * We must assert BSY ourselves, until the target drops the SEL
2545 * signal.
2546 */
2547
2548 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2549
2550 while (NCR5380_read(STATUS_REG) & SR_SEL);
2551 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2552
2553 /*
2554 * Wait for target to go into MSGIN.
2555 */
2556
2557 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
2558
2559#if 1
2560 // acknowledge toggle to MSGIN
2561 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN));
2562
2563 // peek at the byte without really hitting the bus
2564 msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG);
2565#endif
2566
2567 if (!(msg[0] & 0x80)) {
2568 printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
db9dff32005-04-03 14:53:59 -05002569 scsi_print_msg(msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002570 do_abort(instance);
2571 return;
2572 }
2573 lun = (msg[0] & 0x07);
2574
2575 /*
2576 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2577 * just reestablished, and remove it from the disconnected queue.
2578 */
2579
2580 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL;
2581 tmp; prev = tmp, tmp = NEXT(tmp) ) {
2582 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2583#ifdef SUPPORT_TAGS
2584 && (tag == tmp->tag)
2585#endif
2586 ) {
2587 if (prev) {
2588 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
2589 NEXT(prev) = NEXT(tmp);
2590 } else {
2591 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2592 hostdata->disconnected_queue = NEXT(tmp);
2593 }
2594 NEXT(tmp) = NULL;
2595 break;
2596 }
2597 }
2598
2599 if (!tmp) {
2600 printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
2601#ifdef SUPPORT_TAGS
2602 "tag %d "
2603#endif
2604 "not in disconnected_queue.\n",
2605 HOSTNO, target_mask, lun
2606#ifdef SUPPORT_TAGS
2607 , tag
2608#endif
2609 );
2610 /*
2611 * Since we have an established nexus that we can't do anything
2612 * with, we must abort it.
2613 */
2614 do_abort(instance);
2615 return;
2616 }
2617#if 1
2618 /* engage dma setup for the command we just saw */
2619 {
2620 void *d;
2621 unsigned long count;
2622
2623 if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) {
2624 count = tmp->SCp.buffer->length;
2625 d = SGADDR(tmp->SCp.buffer);
2626 } else {
2627 count = tmp->SCp.this_residual;
2628 d = tmp->SCp.ptr;
2629 }
2630#ifdef REAL_DMA
2631 /* setup this command for dma if not already */
2632 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done != tmp))
2633 {
2634 sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request));
2635 sun3_dma_setup_done = tmp;
2636 }
2637#endif
2638 }
2639#endif
2640
2641 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
2642 /* Accept message by clearing ACK */
2643 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2644
2645#ifdef SUPPORT_TAGS
2646 /* If the phase is still MSGIN, the target wants to send some more
2647 * messages. In case it supports tagged queuing, this is probably a
2648 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2649 */
2650 tag = TAG_NONE;
2651 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2652 /* Accept previous IDENTIFY message by clearing ACK */
2653 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2654 len = 2;
2655 data = msg+1;
2656 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2657 msg[1] == SIMPLE_QUEUE_TAG)
2658 tag = msg[2];
2659 TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
2660 "reselection\n", HOSTNO, target_mask, lun, tag);
2661 }
2662#endif
2663
2664 hostdata->connected = tmp;
2665 RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2666 HOSTNO, tmp->target, tmp->lun, tmp->tag);
2667}
2668
2669
2670/*
2671 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2672 *
2673 * Purpose : abort a command
2674 *
2675 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2676 * host byte of the result field to, if zero DID_ABORTED is
2677 * used.
2678 *
2679 * Returns : 0 - success, -1 on failure.
2680 *
2681 * XXX - there is no way to abort the command that is currently
2682 * connected, you have to wait for it to complete. If this is
2683 * a problem, we could implement longjmp() / setjmp(), setjmp()
2684 * called where the loop started in NCR5380_main().
2685 */
2686
2687static int NCR5380_abort (Scsi_Cmnd *cmd)
2688{
2689 struct Scsi_Host *instance = cmd->device->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);
db9dff32005-04-03 14:53:59 -05002695 scsi_print_command(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002696
2697 NCR5380_print_status (instance);
2698
2699 local_irq_save(flags);
2700
2701 ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
2702 NCR5380_read(BUS_AND_STATUS_REG),
2703 NCR5380_read(STATUS_REG));
2704
2705#if 1
2706/*
2707 * Case 1 : If the command is the currently executing command,
2708 * we'll set the aborted flag and return control so that
2709 * information transfer routine can exit cleanly.
2710 */
2711
2712 if (hostdata->connected == cmd) {
2713
2714 ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO);
2715/*
2716 * We should perform BSY checking, and make sure we haven't slipped
2717 * into BUS FREE.
2718 */
2719
2720/* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2721/*
2722 * Since we can't change phases until we've completed the current
2723 * handshake, we have to source or sink a byte of data if the current
2724 * phase is not MSGOUT.
2725 */
2726
2727/*
2728 * Return control to the executing NCR drive so we can clear the
2729 * aborted flag and get back into our main loop.
2730 */
2731
2732 if (do_abort(instance) == 0) {
2733 hostdata->aborted = 1;
2734 hostdata->connected = NULL;
2735 cmd->result = DID_ABORT << 16;
2736#ifdef SUPPORT_TAGS
2737 cmd_free_tag( cmd );
2738#else
2739 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2740#endif
2741 local_irq_restore(flags);
2742 cmd->scsi_done(cmd);
2743 return SCSI_ABORT_SUCCESS;
2744 } else {
2745/* local_irq_restore(flags); */
2746 printk("scsi%d: abort of connected command failed!\n", HOSTNO);
2747 return SCSI_ABORT_ERROR;
2748 }
2749 }
2750#endif
2751
2752/*
2753 * Case 2 : If the command hasn't been issued yet, we simply remove it
2754 * from the issue queue.
2755 */
2756 for (prev = (Scsi_Cmnd **) &(hostdata->issue_queue),
2757 tmp = (Scsi_Cmnd *) hostdata->issue_queue;
2758 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
2759 if (cmd == tmp) {
2760 REMOVE(5, *prev, tmp, NEXT(tmp));
2761 (*prev) = NEXT(tmp);
2762 NEXT(tmp) = NULL;
2763 tmp->result = DID_ABORT << 16;
2764 local_irq_restore(flags);
2765 ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
2766 HOSTNO);
2767 /* Tagged queuing note: no tag to free here, hasn't been assigned
2768 * yet... */
2769 tmp->scsi_done(tmp);
2770 return SCSI_ABORT_SUCCESS;
2771 }
2772
2773/*
2774 * Case 3 : If any commands are connected, we're going to fail the abort
2775 * and let the high level SCSI driver retry at a later time or
2776 * issue a reset.
2777 *
2778 * Timeouts, and therefore aborted commands, will be highly unlikely
2779 * and handling them cleanly in this situation would make the common
2780 * case of noresets less efficient, and would pollute our code. So,
2781 * we fail.
2782 */
2783
2784 if (hostdata->connected) {
2785 local_irq_restore(flags);
2786 ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
2787 return SCSI_ABORT_SNOOZE;
2788 }
2789
2790/*
2791 * Case 4: If the command is currently disconnected from the bus, and
2792 * there are no connected commands, we reconnect the I_T_L or
2793 * I_T_L_Q nexus associated with it, go into message out, and send
2794 * an abort message.
2795 *
2796 * This case is especially ugly. In order to reestablish the nexus, we
2797 * need to call NCR5380_select(). The easiest way to implement this
2798 * function was to abort if the bus was busy, and let the interrupt
2799 * handler triggered on the SEL for reselect take care of lost arbitrations
2800 * where necessary, meaning interrupts need to be enabled.
2801 *
2802 * When interrupts are enabled, the queues may change - so we
2803 * can't remove it from the disconnected queue before selecting it
2804 * because that could cause a failure in hashing the nexus if that
2805 * device reselected.
2806 *
2807 * Since the queues may change, we can't use the pointers from when we
2808 * first locate it.
2809 *
2810 * So, we must first locate the command, and if NCR5380_select()
2811 * succeeds, then issue the abort, relocate the command and remove
2812 * it from the disconnected queue.
2813 */
2814
2815 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp;
2816 tmp = NEXT(tmp))
2817 if (cmd == tmp) {
2818 local_irq_restore(flags);
2819 ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
2820
2821 if (NCR5380_select (instance, cmd, (int) cmd->tag))
2822 return SCSI_ABORT_BUSY;
2823
2824 ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
2825
2826 do_abort (instance);
2827
2828 local_irq_save(flags);
2829 for (prev = (Scsi_Cmnd **) &(hostdata->disconnected_queue),
2830 tmp = (Scsi_Cmnd *) hostdata->disconnected_queue;
2831 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
2832 if (cmd == tmp) {
2833 REMOVE(5, *prev, tmp, NEXT(tmp));
2834 *prev = NEXT(tmp);
2835 NEXT(tmp) = NULL;
2836 tmp->result = DID_ABORT << 16;
2837 /* We must unlock the tag/LUN immediately here, since the
2838 * target goes to BUS FREE and doesn't send us another
2839 * message (COMMAND_COMPLETE or the like)
2840 */
2841#ifdef SUPPORT_TAGS
2842 cmd_free_tag( tmp );
2843#else
2844 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2845#endif
2846 local_irq_restore(flags);
2847 tmp->scsi_done(tmp);
2848 return SCSI_ABORT_SUCCESS;
2849 }
2850 }
2851
2852/*
2853 * Case 5 : If we reached this point, the command was not found in any of
2854 * the queues.
2855 *
2856 * We probably reached this point because of an unlikely race condition
2857 * between the command completing successfully and the abortion code,
2858 * so we won't panic, but we will notify the user in case something really
2859 * broke.
2860 */
2861
2862 local_irq_restore(flags);
2863 printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully\n"
2864 KERN_INFO " before abortion\n", HOSTNO);
2865
2866 return SCSI_ABORT_NOT_RUNNING;
2867}
2868
2869
2870/*
2871 * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd)
2872 *
2873 * Purpose : reset the SCSI bus.
2874 *
2875 * Returns : SCSI_RESET_WAKEUP
2876 *
2877 */
2878
2879static int NCR5380_bus_reset( Scsi_Cmnd *cmd)
2880{
2881 SETUP_HOSTDATA(cmd->device->host);
2882 int i;
2883 unsigned long flags;
2884#if 1
2885 Scsi_Cmnd *connected, *disconnected_queue;
2886#endif
2887
2888
2889 NCR5380_print_status (cmd->device->host);
2890
2891 /* get in phase */
2892 NCR5380_write( TARGET_COMMAND_REG,
2893 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
2894 /* assert RST */
2895 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
2896 udelay (40);
2897 /* reset NCR registers */
2898 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2899 NCR5380_write( MODE_REG, MR_BASE );
2900 NCR5380_write( TARGET_COMMAND_REG, 0 );
2901 NCR5380_write( SELECT_ENABLE_REG, 0 );
2902 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2903 * through anymore ... */
2904 (void)NCR5380_read( RESET_PARITY_INTERRUPT_REG );
2905
2906#if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
2907 /* XXX see below XXX */
2908
2909 /* MSch: old-style reset: actually abort all command processing here */
2910
2911 /* After the reset, there are no more connected or disconnected commands
2912 * and no busy units; to avoid problems with re-inserting the commands
2913 * into the issue_queue (via scsi_done()), the aborted commands are
2914 * remembered in local variables first.
2915 */
2916 local_irq_save(flags);
2917 connected = (Scsi_Cmnd *)hostdata->connected;
2918 hostdata->connected = NULL;
2919 disconnected_queue = (Scsi_Cmnd *)hostdata->disconnected_queue;
2920 hostdata->disconnected_queue = NULL;
2921#ifdef SUPPORT_TAGS
2922 free_all_tags();
2923#endif
2924 for( i = 0; i < 8; ++i )
2925 hostdata->busy[i] = 0;
2926#ifdef REAL_DMA
2927 hostdata->dma_len = 0;
2928#endif
2929 local_irq_restore(flags);
2930
2931 /* In order to tell the mid-level code which commands were aborted,
2932 * set the command status to DID_RESET and call scsi_done() !!!
2933 * This ultimately aborts processing of these commands in the mid-level.
2934 */
2935
2936 if ((cmd = connected)) {
2937 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2938 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2939 cmd->scsi_done( cmd );
2940 }
2941
2942 for (i = 0; (cmd = disconnected_queue); ++i) {
2943 disconnected_queue = NEXT(cmd);
2944 NEXT(cmd) = NULL;
2945 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2946 cmd->scsi_done( cmd );
2947 }
2948 if (i > 0)
2949 ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
2950
2951
2952 /* since all commands have been explicitly terminated, we need to tell
2953 * the midlevel code that the reset was SUCCESSFUL, and there is no
2954 * need to 'wake up' the commands by a request_sense
2955 */
2956 return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
2957#else /* 1 */
2958
2959 /* MSch: new-style reset handling: let the mid-level do what it can */
2960
2961 /* ++guenther: MID-LEVEL IS STILL BROKEN.
2962 * Mid-level is supposed to requeue all commands that were active on the
2963 * various low-level queues. In fact it does this, but that's not enough
2964 * because all these commands are subject to timeout. And if a timeout
2965 * happens for any removed command, *_abort() is called but all queues
2966 * are now empty. Abort then gives up the falcon lock, which is fatal,
2967 * since the mid-level will queue more commands and must have the lock
2968 * (it's all happening inside timer interrupt handler!!).
2969 * Even worse, abort will return NOT_RUNNING for all those commands not
2970 * on any queue, so they won't be retried ...
2971 *
2972 * Conclusion: either scsi.c disables timeout for all resetted commands
2973 * immediately, or we lose! As of linux-2.0.20 it doesn't.
2974 */
2975
2976 /* After the reset, there are no more connected or disconnected commands
2977 * and no busy units; so clear the low-level status here to avoid
2978 * conflicts when the mid-level code tries to wake up the affected
2979 * commands!
2980 */
2981
2982 if (hostdata->issue_queue)
2983 ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
2984 if (hostdata->connected)
2985 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2986 if (hostdata->disconnected_queue)
2987 ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
2988
2989 local_irq_save(flags);
2990 hostdata->issue_queue = NULL;
2991 hostdata->connected = NULL;
2992 hostdata->disconnected_queue = NULL;
2993#ifdef SUPPORT_TAGS
2994 free_all_tags();
2995#endif
2996 for( i = 0; i < 8; ++i )
2997 hostdata->busy[i] = 0;
2998#ifdef REAL_DMA
2999 hostdata->dma_len = 0;
3000#endif
3001 local_irq_restore(flags);
3002
3003 /* we did no complete reset of all commands, so a wakeup is required */
3004 return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;
3005#endif /* 1 */
3006}
3007
3008/* Local Variables: */
3009/* tab-width: 8 */
3010/* End: */