blob: 98e3fe10c1dcfe8d6be2c12f9c8da461afcae710 [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>
Matthew Wilcox1abfd372005-12-15 16:22:01 -050073#include <scsi/scsi_transport_spi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
75/*
76 * Further development / testing that should be done :
77 * 1. Test linked command handling code after Eric is ready with
78 * the high level code.
79 */
80
81#if (NDEBUG & NDEBUG_LISTS)
82#define LIST(x,y) \
83 { printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); \
84 if ((x)==(y)) udelay(5); }
85#define REMOVE(w,x,y,z) \
86 { printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, \
87 (void*)(w), (void*)(x), (void*)(y), (void*)(z)); \
88 if ((x)==(y)) udelay(5); }
89#else
90#define LIST(x,y)
91#define REMOVE(w,x,y,z)
92#endif
93
94#ifndef notyet
95#undef LINKED
96#endif
97
98/*
99 * Design
100 * Issues :
101 *
102 * The other Linux SCSI drivers were written when Linux was Intel PC-only,
103 * and specifically for each board rather than each chip. This makes their
104 * adaptation to platforms like the Mac (Some of which use NCR5380's)
105 * more difficult than it has to be.
106 *
107 * Also, many of the SCSI drivers were written before the command queuing
108 * routines were implemented, meaning their implementations of queued
109 * commands were hacked on rather than designed in from the start.
110 *
111 * When I designed the Linux SCSI drivers I figured that
112 * while having two different SCSI boards in a system might be useful
113 * for debugging things, two of the same type wouldn't be used.
114 * Well, I was wrong and a number of users have mailed me about running
115 * multiple high-performance SCSI boards in a server.
116 *
117 * Finally, when I get questions from users, I have no idea what
118 * revision of my driver they are running.
119 *
120 * This driver attempts to address these problems :
121 * This is a generic 5380 driver. To use it on a different platform,
122 * one simply writes appropriate system specific macros (ie, data
123 * transfer - some PC's will use the I/O bus, 68K's must use
124 * memory mapped) and drops this file in their 'C' wrapper.
125 *
126 * As far as command queueing, two queues are maintained for
127 * each 5380 in the system - commands that haven't been issued yet,
128 * and commands that are currently executing. This means that an
129 * unlimited number of commands may be queued, letting
130 * more commands propagate from the higher driver levels giving higher
131 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
132 * allowing multiple commands to propagate all the way to a SCSI-II device
133 * while a command is already executing.
134 *
135 * To solve the multiple-boards-in-the-same-system problem,
136 * there is a separate instance structure for each instance
137 * of a 5380 in the system. So, multiple NCR5380 drivers will
138 * be able to coexist with appropriate changes to the high level
139 * SCSI code.
140 *
141 * A NCR5380_PUBLIC_REVISION macro is provided, with the release
142 * number (updated for each public release) printed by the
143 * NCR5380_print_options command, which should be called from the
144 * wrapper detect function, so that I know what release of the driver
145 * users are using.
146 *
147 * Issues specific to the NCR5380 :
148 *
149 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
150 * piece of hardware that requires you to sit in a loop polling for
151 * the REQ signal as long as you are connected. Some devices are
152 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
153 * while doing long seek operations.
154 *
155 * The workaround for this is to keep track of devices that have
156 * disconnected. If the device hasn't disconnected, for commands that
157 * should disconnect, we do something like
158 *
159 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
160 *
161 * Some tweaking of N and M needs to be done. An algorithm based
162 * on "time to data" would give the best results as long as short time
163 * to datas (ie, on the same track) were considered, however these
164 * broken devices are the exception rather than the rule and I'd rather
165 * spend my time optimizing for the normal case.
166 *
167 * Architecture :
168 *
169 * At the heart of the design is a coroutine, NCR5380_main,
170 * which is started when not running by the interrupt handler,
171 * timer, and queue command function. It attempts to establish
172 * I_T_L or I_T_L_Q nexuses by removing the commands from the
173 * issue queue and calling NCR5380_select() if a nexus
174 * is not established.
175 *
176 * Once a nexus is established, the NCR5380_information_transfer()
177 * phase goes through the various phases as instructed by the target.
178 * if the target goes into MSG IN and sends a DISCONNECT message,
179 * the command structure is placed into the per instance disconnected
180 * queue, and NCR5380_main tries to find more work. If USLEEP
181 * was defined, and the target is idle for too long, the system
182 * will try to sleep.
183 *
184 * If a command has disconnected, eventually an interrupt will trigger,
185 * calling NCR5380_intr() which will in turn call NCR5380_reselect
186 * to reestablish a nexus. This will run main if necessary.
187 *
188 * On command termination, the done function will be called as
189 * appropriate.
190 *
191 * SCSI pointers are maintained in the SCp field of SCSI command
192 * structures, being initialized after the command is connected
193 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
194 * Note that in violation of the standard, an implicit SAVE POINTERS operation
195 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
196 */
197
198/*
199 * Using this file :
200 * This file a skeleton Linux SCSI driver for the NCR 5380 series
201 * of chips. To use it, you write an architecture specific functions
202 * and macros and include this file in your driver.
203 *
204 * These macros control options :
205 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
206 * for commands that return with a CHECK CONDITION status.
207 *
208 * LINKED - if defined, linked commands are supported.
209 *
210 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
211 *
212 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
213 *
214 * These macros MUST be defined :
215 *
216 * NCR5380_read(register) - read from the specified register
217 *
218 * NCR5380_write(register, value) - write to the specific register
219 *
220 * Either real DMA *or* pseudo DMA may be implemented
221 * REAL functions :
222 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
223 * Note that the DMA setup functions should return the number of bytes
224 * that they were able to program the controller for.
225 *
226 * Also note that generic i386/PC versions of these macros are
227 * available as NCR5380_i386_dma_write_setup,
228 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
229 *
230 * NCR5380_dma_write_setup(instance, src, count) - initialize
231 * NCR5380_dma_read_setup(instance, dst, count) - initialize
232 * NCR5380_dma_residual(instance); - residual count
233 *
234 * PSEUDO functions :
235 * NCR5380_pwrite(instance, src, count)
236 * NCR5380_pread(instance, dst, count);
237 *
238 * If nothing specific to this implementation needs doing (ie, with external
239 * hardware), you must also define
240 *
241 * NCR5380_queue_command
242 * NCR5380_reset
243 * NCR5380_abort
244 * NCR5380_proc_info
245 *
246 * to be the global entry points into the specific driver, ie
247 * #define NCR5380_queue_command t128_queue_command.
248 *
249 * If this is not done, the routines will be defined as static functions
250 * with the NCR5380* names and the user must provide a globally
251 * accessible wrapper function.
252 *
253 * The generic driver is initialized by calling NCR5380_init(instance),
254 * after setting the appropriate host specific fields and ID. If the
255 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
256 * possible) function may be used. Before the specific driver initialization
257 * code finishes, NCR5380_print_options should be called.
258 */
259
260static struct Scsi_Host *first_instance = NULL;
Christoph Hellwigd0be4a7d2005-10-31 18:31:40 +0100261static struct scsi_host_template *the_template = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
263/* Macros ease life... :-) */
264#define SETUP_HOSTDATA(in) \
265 struct NCR5380_hostdata *hostdata = \
266 (struct NCR5380_hostdata *)(in)->hostdata
267#define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
268
Al Viro2bb71b52006-12-14 15:00:15 +0000269#define NEXT(cmd) (*(struct scsi_cmnd **)&((cmd)->host_scribble))
Henne811c9362006-10-03 19:51:59 +0200270#define NEXTADDR(cmd) ((struct scsi_cmnd **)&((cmd)->host_scribble))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
272#define HOSTNO instance->host_no
273#define H_NO(cmd) (cmd)->device->host->host_no
274
275#define SGADDR(buffer) (void *)(((unsigned long)page_address((buffer)->page)) + \
276 (buffer)->offset)
277
278#ifdef SUPPORT_TAGS
279
280/*
281 * Functions for handling tagged queuing
282 * =====================================
283 *
284 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
285 *
286 * Using consecutive numbers for the tags is no good idea in my eyes. There
287 * could be wrong re-usings if the counter (8 bit!) wraps and some early
288 * command has been preempted for a long time. My solution: a bitfield for
289 * remembering used tags.
290 *
291 * There's also the problem that each target has a certain queue size, but we
292 * cannot know it in advance :-( We just see a QUEUE_FULL status being
293 * returned. So, in this case, the driver internal queue size assumption is
294 * reduced to the number of active tags if QUEUE_FULL is returned by the
295 * target. The command is returned to the mid-level, but with status changed
296 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
297 * correctly.
298 *
299 * We're also not allowed running tagged commands as long as an untagged
300 * command is active. And REQUEST SENSE commands after a contingent allegiance
301 * condition _must_ be untagged. To keep track whether an untagged command has
302 * been issued, the host->busy array is still employed, as it is without
303 * support for tagged queuing.
304 *
305 * One could suspect that there are possible race conditions between
306 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
307 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
308 * which already guaranteed to be running at most once. It is also the only
309 * place where tags/LUNs are allocated. So no other allocation can slip
310 * between that pair, there could only happen a reselection, which can free a
311 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
312 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
313 */
314
315/* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
316#undef TAG_NONE
317#define TAG_NONE 0xff
318
319/* For the m68k, the number of bits in 'allocated' must be a multiple of 32! */
320#if (MAX_TAGS % 32) != 0
321#error "MAX_TAGS must be a multiple of 32!"
322#endif
323
324typedef struct {
325 char allocated[MAX_TAGS/8];
326 int nr_allocated;
327 int queue_size;
328} TAG_ALLOC;
329
330static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */
331
332
333static void __init init_tags( void )
334{
335 int target, lun;
336 TAG_ALLOC *ta;
337
338 if (!setup_use_tagged_queuing)
339 return;
340
341 for( target = 0; target < 8; ++target ) {
342 for( lun = 0; lun < 8; ++lun ) {
343 ta = &TagAlloc[target][lun];
344 memset( &ta->allocated, 0, MAX_TAGS/8 );
345 ta->nr_allocated = 0;
346 /* At the beginning, assume the maximum queue size we could
347 * support (MAX_TAGS). This value will be decreased if the target
348 * returns QUEUE_FULL status.
349 */
350 ta->queue_size = MAX_TAGS;
351 }
352 }
353}
354
355
356/* Check if we can issue a command to this LUN: First see if the LUN is marked
357 * busy by an untagged command. If the command should use tagged queuing, also
358 * check that there is a free tag and the target's queue won't overflow. This
359 * function should be called with interrupts disabled to avoid race
360 * conditions.
361 */
362
Henne811c9362006-10-03 19:51:59 +0200363static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364{
365 SETUP_HOSTDATA(cmd->device->host);
366
367 if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun))
368 return( 1 );
369 if (!should_be_tagged ||
370 !setup_use_tagged_queuing || !cmd->device->tagged_supported)
371 return( 0 );
372 if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >=
373 TagAlloc[cmd->device->id][cmd->device->lun].queue_size ) {
374 TAG_PRINTK( "scsi%d: target %d lun %d: no free tags\n",
375 H_NO(cmd), cmd->device->id, cmd->device->lun );
376 return( 1 );
377 }
378 return( 0 );
379}
380
381
382/* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
383 * must be called before!), or reserve the LUN in 'busy' if the command is
384 * untagged.
385 */
386
Henne811c9362006-10-03 19:51:59 +0200387static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388{
389 SETUP_HOSTDATA(cmd->device->host);
390
391 /* If we or the target don't support tagged queuing, allocate the LUN for
392 * an untagged command.
393 */
394 if (!should_be_tagged ||
395 !setup_use_tagged_queuing || !cmd->device->tagged_supported) {
396 cmd->tag = TAG_NONE;
397 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
398 TAG_PRINTK( "scsi%d: target %d lun %d now allocated by untagged "
399 "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun );
400 }
401 else {
402 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
403
404 cmd->tag = find_first_zero_bit( &ta->allocated, MAX_TAGS );
405 set_bit( cmd->tag, &ta->allocated );
406 ta->nr_allocated++;
407 TAG_PRINTK( "scsi%d: using tag %d for target %d lun %d "
408 "(now %d tags in use)\n",
409 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun,
410 ta->nr_allocated );
411 }
412}
413
414
415/* Mark the tag of command 'cmd' as free, or in case of an untagged command,
416 * unlock the LUN.
417 */
418
Henne811c9362006-10-03 19:51:59 +0200419static void cmd_free_tag(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420{
421 SETUP_HOSTDATA(cmd->device->host);
422
423 if (cmd->tag == TAG_NONE) {
424 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
425 TAG_PRINTK( "scsi%d: target %d lun %d untagged cmd finished\n",
426 H_NO(cmd), cmd->device->id, cmd->device->lun );
427 }
428 else if (cmd->tag >= MAX_TAGS) {
429 printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
430 H_NO(cmd), cmd->tag );
431 }
432 else {
433 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
434 clear_bit( cmd->tag, &ta->allocated );
435 ta->nr_allocated--;
436 TAG_PRINTK( "scsi%d: freed tag %d for target %d lun %d\n",
437 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun );
438 }
439}
440
441
442static void free_all_tags( void )
443{
444 int target, lun;
445 TAG_ALLOC *ta;
446
447 if (!setup_use_tagged_queuing)
448 return;
449
450 for( target = 0; target < 8; ++target ) {
451 for( lun = 0; lun < 8; ++lun ) {
452 ta = &TagAlloc[target][lun];
453 memset( &ta->allocated, 0, MAX_TAGS/8 );
454 ta->nr_allocated = 0;
455 }
456 }
457}
458
459#endif /* SUPPORT_TAGS */
460
461
462/*
Henne811c9362006-10-03 19:51:59 +0200463 * Function: void merge_contiguous_buffers(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 *
465 * Purpose: Try to merge several scatter-gather requests into one DMA
466 * transfer. This is possible if the scatter buffers lie on
467 * physical contiguous addresses.
468 *
Henne811c9362006-10-03 19:51:59 +0200469 * Parameters: struct scsi_cmnd *cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 * The command to work on. The first scatter buffer's data are
471 * assumed to be already transfered into ptr/this_residual.
472 */
473
Henne811c9362006-10-03 19:51:59 +0200474static void merge_contiguous_buffers(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475{
476 unsigned long endaddr;
477#if (NDEBUG & NDEBUG_MERGING)
478 unsigned long oldlen = cmd->SCp.this_residual;
479 int cnt = 1;
480#endif
481
482 for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1;
483 cmd->SCp.buffers_residual &&
484 virt_to_phys(SGADDR(&(cmd->SCp.buffer[1]))) == endaddr; ) {
485
486 MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
487 SGADDR(&(cmd->SCp.buffer[1])), endaddr);
488#if (NDEBUG & NDEBUG_MERGING)
489 ++cnt;
490#endif
491 ++cmd->SCp.buffer;
492 --cmd->SCp.buffers_residual;
493 cmd->SCp.this_residual += cmd->SCp.buffer->length;
494 endaddr += cmd->SCp.buffer->length;
495 }
496#if (NDEBUG & NDEBUG_MERGING)
497 if (oldlen != cmd->SCp.this_residual)
498 MER_PRINTK("merged %d buffers from %p, new length %08x\n",
499 cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
500#endif
501}
502
503/*
Henne811c9362006-10-03 19:51:59 +0200504 * Function : void initialize_SCp(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 *
506 * Purpose : initialize the saved data pointers for cmd to point to the
507 * start of the buffer.
508 *
Henne811c9362006-10-03 19:51:59 +0200509 * Inputs : cmd - struct scsi_cmnd structure to have pointers reset.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 */
511
Henne811c9362006-10-03 19:51:59 +0200512static __inline__ void initialize_SCp(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513{
514 /*
515 * Initialize the Scsi Pointer field so that all of the commands in the
516 * various queues are valid.
517 */
518
519 if (cmd->use_sg) {
Christoph Hellwig79bd3f82006-07-14 10:29:34 +0200520 cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 cmd->SCp.buffers_residual = cmd->use_sg - 1;
522 cmd->SCp.ptr = (char *) SGADDR(cmd->SCp.buffer);
523 cmd->SCp.this_residual = cmd->SCp.buffer->length;
524
525 /* ++roman: Try to merge some scatter-buffers if they are at
526 * contiguous physical addresses.
527 */
528// merge_contiguous_buffers( cmd );
529 } else {
530 cmd->SCp.buffer = NULL;
531 cmd->SCp.buffers_residual = 0;
532 cmd->SCp.ptr = (char *) cmd->request_buffer;
533 cmd->SCp.this_residual = cmd->request_bufflen;
534 }
535
536}
537
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538#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;
Al Viro2bb71b52006-12-14 15:00:15 +0000653static DECLARE_WORK(NCR5380_tqueue, NCR5380_main);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654
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
Henne811c9362006-10-03 19:51:59 +0200756char *lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, char *pos, char *buffer,
757 int length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758
Henne811c9362006-10-03 19:51:59 +0200759static int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer,
760 char **start, off_t offset, int length, int inout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761{
762 char *pos = buffer;
763 struct NCR5380_hostdata *hostdata;
Henne811c9362006-10-03 19:51:59 +0200764 struct scsi_cmnd *ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 unsigned long flags;
766 off_t begin = 0;
767#define check_offset() \
768 do { \
769 if (pos - buffer < offset - begin) { \
770 begin += pos - buffer; \
771 pos = buffer; \
772 } \
773 } while (0)
774
775 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
776
777 if (inout) { /* Has data been written to the file ? */
778 return(-ENOSYS); /* Currently this is a no-op */
779 }
780 SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
781 check_offset();
782 local_irq_save(flags);
783 SPRINTF("NCR5380: coroutine is%s running.\n", main_running ? "" : "n't");
784 check_offset();
785 if (!hostdata->connected)
786 SPRINTF("scsi%d: no currently connected command\n", HOSTNO);
787 else
Henne811c9362006-10-03 19:51:59 +0200788 pos = lprint_Scsi_Cmnd ((struct scsi_cmnd *) hostdata->connected,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 pos, buffer, length);
790 SPRINTF("scsi%d: issue_queue\n", HOSTNO);
791 check_offset();
Henne811c9362006-10-03 19:51:59 +0200792 for (ptr = (struct scsi_cmnd *) hostdata->issue_queue; ptr; ptr = NEXT(ptr))
793 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
795 check_offset();
796 }
797
798 SPRINTF("scsi%d: disconnected_queue\n", HOSTNO);
799 check_offset();
Henne811c9362006-10-03 19:51:59 +0200800 for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 ptr = NEXT(ptr)) {
802 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
803 check_offset();
804 }
805
806 local_irq_restore(flags);
807 *start = buffer + (offset - begin);
808 if (pos - buffer < offset - begin)
809 return 0;
810 else if (pos - buffer - (offset - begin) < length)
811 return pos - buffer - (offset - begin);
812 return length;
813}
814
Henne811c9362006-10-03 19:51:59 +0200815static char *lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, char *pos, char *buffer,
816 int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817{
818 int i, s;
819 unsigned char *command;
820 SPRINTF("scsi%d: destination target %d, lun %d\n",
821 H_NO(cmd), cmd->device->id, cmd->device->lun);
822 SPRINTF(" command = ");
823 command = cmd->cmnd;
824 SPRINTF("%2d (0x%02x)", command[0], command[0]);
825 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
826 SPRINTF(" %02x", command[i]);
827 SPRINTF("\n");
828 return pos;
829}
830
831
832/*
833 * Function : void NCR5380_init (struct Scsi_Host *instance)
834 *
835 * Purpose : initializes *instance and corresponding 5380 chip.
836 *
837 * Inputs : instance - instantiation of the 5380 driver.
838 *
839 * Notes : I assume that the host, hostno, and id bits have been
840 * set correctly. I don't care about the irq and other fields.
841 *
842 */
843
844static int NCR5380_init (struct Scsi_Host *instance, int flags)
845{
846 int i;
847 SETUP_HOSTDATA(instance);
848
849 NCR5380_all_init();
850
851 hostdata->aborted = 0;
852 hostdata->id_mask = 1 << instance->this_id;
853 hostdata->id_higher_mask = 0;
854 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
855 if (i > hostdata->id_mask)
856 hostdata->id_higher_mask |= i;
857 for (i = 0; i < 8; ++i)
858 hostdata->busy[i] = 0;
859#ifdef SUPPORT_TAGS
860 init_tags();
861#endif
862#if defined (REAL_DMA)
863 hostdata->dma_len = 0;
864#endif
865 hostdata->targets_present = 0;
866 hostdata->connected = NULL;
867 hostdata->issue_queue = NULL;
868 hostdata->disconnected_queue = NULL;
869 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
870
871 if (!the_template) {
872 the_template = instance->hostt;
873 first_instance = instance;
874 }
875
876
877#ifndef AUTOSENSE
878 if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1))
879 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
880 " without AUTOSENSE option, contingent allegiance conditions may\n"
881 " be incorrectly cleared.\n", HOSTNO);
882#endif /* def AUTOSENSE */
883
884 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
885 NCR5380_write(MODE_REG, MR_BASE);
886 NCR5380_write(TARGET_COMMAND_REG, 0);
887 NCR5380_write(SELECT_ENABLE_REG, 0);
888
889 return 0;
890}
891
892/*
Henne811c9362006-10-03 19:51:59 +0200893 * Function : int NCR5380_queue_command (struct scsi_cmnd *cmd,
894 * void (*done)(struct scsi_cmnd *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 *
896 * Purpose : enqueues a SCSI command
897 *
898 * Inputs : cmd - SCSI command, done - function called on completion, with
899 * a pointer to the command descriptor.
900 *
901 * Returns : 0
902 *
903 * Side effects :
904 * cmd is added to the per instance issue_queue, with minor
905 * twiddling done to the host specific fields of cmd. If the
906 * main coroutine is not running, it is restarted.
907 *
908 */
909
910/* Only make static if a wrapper function is used */
Henne811c9362006-10-03 19:51:59 +0200911static int NCR5380_queue_command(struct scsi_cmnd *cmd,
912 void (*done)(struct scsi_cmnd *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913{
914 SETUP_HOSTDATA(cmd->device->host);
Henne811c9362006-10-03 19:51:59 +0200915 struct scsi_cmnd *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 unsigned long flags;
917
918#if (NDEBUG & NDEBUG_NO_WRITE)
919 switch (cmd->cmnd[0]) {
920 case WRITE_6:
921 case WRITE_10:
922 printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
923 H_NO(cmd));
924 cmd->result = (DID_ERROR << 16);
925 done(cmd);
926 return 0;
927 }
928#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
929
930
931#ifdef NCR5380_STATS
932# if 0
933 if (!hostdata->connected && !hostdata->issue_queue &&
934 !hostdata->disconnected_queue) {
935 hostdata->timebase = jiffies;
936 }
937# endif
938# ifdef NCR5380_STAT_LIMIT
939 if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
940# endif
941 switch (cmd->cmnd[0])
942 {
943 case WRITE:
944 case WRITE_6:
945 case WRITE_10:
946 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
947 hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;
948 hostdata->pendingw++;
949 break;
950 case READ:
951 case READ_6:
952 case READ_10:
953 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
954 hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;
955 hostdata->pendingr++;
956 break;
957 }
958#endif
959
960 /*
961 * We use the host_scribble field as a pointer to the next command
962 * in a queue
963 */
964
965 NEXT(cmd) = NULL;
966 cmd->scsi_done = done;
967
968 cmd->result = 0;
969
970
971 /*
972 * Insert the cmd into the issue queue. Note that REQUEST SENSE
973 * commands are added to the head of the queue since any command will
974 * clear the contingent allegiance condition that exists and the
975 * sense data is only guaranteed to be valid while the condition exists.
976 */
977
978 local_irq_save(flags);
979 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
980 * Otherwise a running NCR5380_main may steal the lock.
981 * Lock before actually inserting due to fairness reasons explained in
982 * atari_scsi.c. If we insert first, then it's impossible for this driver
983 * to release the lock.
984 * Stop timer for this command while waiting for the lock, or timeouts
985 * may happen (and they really do), and it's no good if the command doesn't
986 * appear in any of the queues.
987 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
988 * because also a timer int can trigger an abort or reset, which would
989 * alter queues and touch the lock.
990 */
991 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
992 LIST(cmd, hostdata->issue_queue);
993 NEXT(cmd) = hostdata->issue_queue;
994 hostdata->issue_queue = cmd;
995 } else {
Henne811c9362006-10-03 19:51:59 +0200996 for (tmp = (struct scsi_cmnd *)hostdata->issue_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 NEXT(tmp); tmp = NEXT(tmp))
998 ;
999 LIST(cmd, tmp);
1000 NEXT(tmp) = cmd;
1001 }
1002
1003 local_irq_restore(flags);
1004
1005 QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd),
1006 (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
1007
1008 /* If queue_command() is called from an interrupt (real one or bottom
1009 * half), we let queue_main() do the job of taking care about main. If it
1010 * is already running, this is a no-op, else main will be queued.
1011 *
1012 * If we're not in an interrupt, we can call NCR5380_main()
1013 * unconditionally, because it cannot be already running.
1014 */
1015 if (in_interrupt() || ((flags >> 8) & 7) >= 6)
1016 queue_main();
1017 else
1018 NCR5380_main(NULL);
1019 return 0;
1020}
1021
1022/*
1023 * Function : NCR5380_main (void)
1024 *
1025 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1026 * be done on the NCR5380 host adapters in a system. Both
1027 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1028 * in case it is not running.
1029 *
1030 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
1031 * reenable them. This prevents reentrancy and kernel stack overflow.
1032 */
1033
Al Viro2bb71b52006-12-14 15:00:15 +00001034static void NCR5380_main (struct work_struct *bl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035{
Henne811c9362006-10-03 19:51:59 +02001036 struct scsi_cmnd *tmp, *prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 struct Scsi_Host *instance = first_instance;
1038 struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
1039 int done;
1040 unsigned long flags;
1041
1042 /*
1043 * We run (with interrupts disabled) until we're sure that none of
1044 * the host adapters have anything that can be done, at which point
1045 * we set main_running to 0 and exit.
1046 *
1047 * Interrupts are enabled before doing various other internal
1048 * instructions, after we've decided that we need to run through
1049 * the loop again.
1050 *
1051 * this should prevent any race conditions.
1052 *
1053 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1054 * because also a timer int can trigger an abort or reset, which can
1055 * alter queues and touch the Falcon lock.
1056 */
1057
1058 /* Tell int handlers main() is now already executing. Note that
1059 no races are possible here. If an int comes in before
1060 'main_running' is set here, and queues/executes main via the
1061 task queue, it doesn't do any harm, just this instance of main
1062 won't find any work left to do. */
1063 if (main_running)
1064 return;
1065 main_running = 1;
1066
1067 local_save_flags(flags);
1068 do {
1069 local_irq_disable(); /* Freeze request queues */
1070 done = 1;
1071
1072 if (!hostdata->connected) {
1073 MAIN_PRINTK( "scsi%d: not connected\n", HOSTNO );
1074 /*
1075 * Search through the issue_queue for a command destined
1076 * for a target that's not busy.
1077 */
1078#if (NDEBUG & NDEBUG_LISTS)
Henne811c9362006-10-03 19:51:59 +02001079 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1081 ;
1082 if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/
1083#endif
Henne811c9362006-10-03 19:51:59 +02001084 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) {
1086
1087#if (NDEBUG & NDEBUG_LISTS)
1088 if (prev != tmp)
1089 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
1090 tmp, tmp->target, hostdata->busy[tmp->target],
1091 tmp->lun);
1092#endif
1093 /* When we find one, remove it from the issue queue. */
1094 /* ++guenther: possible race with Falcon locking */
1095 if (
1096#ifdef SUPPORT_TAGS
1097 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
1098#else
1099 !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))
1100#endif
1101 ) {
1102 /* ++guenther: just to be sure, this must be atomic */
1103 local_irq_disable();
1104 if (prev) {
1105 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
1106 NEXT(prev) = NEXT(tmp);
1107 } else {
1108 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1109 hostdata->issue_queue = NEXT(tmp);
1110 }
1111 NEXT(tmp) = NULL;
1112
1113 /* reenable interrupts after finding one */
1114 local_irq_restore(flags);
1115
1116 /*
1117 * Attempt to establish an I_T_L nexus here.
1118 * On success, instance->hostdata->connected is set.
1119 * On failure, we must add the command back to the
1120 * issue queue so we can keep trying.
1121 */
1122 MAIN_PRINTK("scsi%d: main(): command for target %d "
1123 "lun %d removed from issue_queue\n",
1124 HOSTNO, tmp->target, tmp->lun);
1125 /*
1126 * REQUEST SENSE commands are issued without tagged
1127 * queueing, even on SCSI-II devices because the
1128 * contingent allegiance condition exists for the
1129 * entire unit.
1130 */
1131 /* ++roman: ...and the standard also requires that
1132 * REQUEST SENSE command are untagged.
1133 */
1134
1135#ifdef SUPPORT_TAGS
1136 cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE );
1137#endif
1138 if (!NCR5380_select(instance, tmp,
1139 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
1140 TAG_NEXT)) {
1141 break;
1142 } else {
1143 local_irq_disable();
1144 LIST(tmp, hostdata->issue_queue);
1145 NEXT(tmp) = hostdata->issue_queue;
1146 hostdata->issue_queue = tmp;
1147#ifdef SUPPORT_TAGS
1148 cmd_free_tag( tmp );
1149#endif
1150 local_irq_restore(flags);
1151 MAIN_PRINTK("scsi%d: main(): select() failed, "
1152 "returned to issue_queue\n", HOSTNO);
1153 if (hostdata->connected)
1154 break;
1155 }
1156 } /* if target/lun/target queue is not busy */
1157 } /* for issue_queue */
1158 } /* if (!hostdata->connected) */
1159 if (hostdata->connected
1160#ifdef REAL_DMA
1161 && !hostdata->dma_len
1162#endif
1163 ) {
1164 local_irq_restore(flags);
1165 MAIN_PRINTK("scsi%d: main: performing information transfer\n",
1166 HOSTNO);
1167 NCR5380_information_transfer(instance);
1168 MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
1169 done = 0;
1170 }
1171 } while (!done);
1172
1173 /* Better allow ints _after_ 'main_running' has been cleared, else
1174 an interrupt could believe we'll pick up the work it left for
1175 us, but we won't see it anymore here... */
1176 main_running = 0;
1177 local_irq_restore(flags);
1178}
1179
1180
1181#ifdef REAL_DMA
1182/*
1183 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1184 *
1185 * Purpose : Called by interrupt handler when DMA finishes or a phase
1186 * mismatch occurs (which would finish the DMA transfer).
1187 *
1188 * Inputs : instance - this instance of the NCR5380.
1189 *
1190 */
1191
1192static void NCR5380_dma_complete( struct Scsi_Host *instance )
1193{
1194 SETUP_HOSTDATA(instance);
1195 int transfered;
1196 unsigned char **data;
1197 volatile int *count;
1198
1199 if (!hostdata->connected) {
1200 printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
1201 "no connected cmd\n", HOSTNO);
1202 return;
1203 }
1204
1205 DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1206 HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
1207 NCR5380_read(STATUS_REG));
1208
1209 if((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) {
1210 printk("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", HOSTNO);
1211 printk("please e-mail sammy@sammy.net with a description of how this\n");
1212 printk("error was produced.\n");
1213 BUG();
1214 }
1215
1216 /* make sure we're not stuck in a data phase */
1217 if((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH |
1218 BASR_ACK)) ==
1219 (BASR_PHASE_MATCH | BASR_ACK)) {
1220 printk("scsi%d: BASR %02x\n", HOSTNO, NCR5380_read(BUS_AND_STATUS_REG));
1221 printk("scsi%d: bus stuck in data phase -- probably a single byte "
1222 "overrun!\n", HOSTNO);
1223 printk("not prepared for this error!\n");
1224 printk("please e-mail sammy@sammy.net with a description of how this\n");
1225 printk("error was produced.\n");
1226 BUG();
1227 }
1228
1229
1230
1231 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1232 NCR5380_write(MODE_REG, MR_BASE);
1233 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1234
1235 transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
1236 hostdata->dma_len = 0;
1237
1238 data = (unsigned char **) &(hostdata->connected->SCp.ptr);
1239 count = &(hostdata->connected->SCp.this_residual);
1240 *data += transfered;
1241 *count -= transfered;
1242
1243}
1244#endif /* REAL_DMA */
1245
1246
1247/*
1248 * Function : void NCR5380_intr (int irq)
1249 *
1250 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1251 * from the disconnected queue, and restarting NCR5380_main()
1252 * as required.
1253 *
1254 * Inputs : int irq, irq that caused this interrupt.
1255 *
1256 */
1257
David Howells7d12e782006-10-05 14:55:46 +01001258static irqreturn_t NCR5380_intr (int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259{
1260 struct Scsi_Host *instance = first_instance;
1261 int done = 1, handled = 0;
1262 unsigned char basr;
1263
1264 INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
1265
1266 /* Look for pending interrupts */
1267 basr = NCR5380_read(BUS_AND_STATUS_REG);
1268 INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
1269 /* dispatch to appropriate routine if found and done=0 */
1270 if (basr & BASR_IRQ) {
1271 NCR_PRINT(NDEBUG_INTR);
1272 if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
1273 done = 0;
Sam Creaseyc39e7ee2006-12-09 10:37:05 +01001274// ENABLE_IRQ();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
1276 NCR5380_reselect(instance);
1277 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1278 }
1279 else if (basr & BASR_PARITY_ERROR) {
1280 INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
1281 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1282 }
1283 else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1284 INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
1285 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1286 }
1287 else {
1288 /*
1289 * The rest of the interrupt conditions can occur only during a
1290 * DMA transfer
1291 */
1292
1293#if defined(REAL_DMA)
1294 /*
1295 * We should only get PHASE MISMATCH and EOP interrupts if we have
1296 * DMA enabled, so do a sanity check based on the current setting
1297 * of the MODE register.
1298 */
1299
1300 if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
1301 ((basr & BASR_END_DMA_TRANSFER) ||
1302 !(basr & BASR_PHASE_MATCH))) {
1303
1304 INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
1305 NCR5380_dma_complete( instance );
1306 done = 0;
Sam Creaseyc39e7ee2006-12-09 10:37:05 +01001307// ENABLE_IRQ();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308 } else
1309#endif /* REAL_DMA */
1310 {
1311/* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1312 if (basr & BASR_PHASE_MATCH)
1313 INT_PRINTK("scsi%d: unknown interrupt, "
1314 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1315 HOSTNO, basr, NCR5380_read(MODE_REG),
1316 NCR5380_read(STATUS_REG));
1317 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1318#ifdef SUN3_SCSI_VME
1319 dregs->csr |= CSR_DMA_ENABLE;
1320#endif
1321 }
1322 } /* if !(SELECTION || PARITY) */
1323 handled = 1;
1324 } /* BASR & IRQ */
1325 else {
1326
1327 printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
1328 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
1329 NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
1330 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1331#ifdef SUN3_SCSI_VME
1332 dregs->csr |= CSR_DMA_ENABLE;
1333#endif
1334 }
1335
1336 if (!done) {
1337 INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
1338 /* Put a call to NCR5380_main() on the queue... */
1339 queue_main();
1340 }
1341 return IRQ_RETVAL(handled);
1342}
1343
1344#ifdef NCR5380_STATS
Henne811c9362006-10-03 19:51:59 +02001345static void collect_stats(struct NCR5380_hostdata *hostdata,
1346 struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347{
1348# ifdef NCR5380_STAT_LIMIT
1349 if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
1350# endif
1351 switch (cmd->cmnd[0])
1352 {
1353 case WRITE:
1354 case WRITE_6:
1355 case WRITE_10:
1356 hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
1357 /*hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;*/
1358 hostdata->pendingw--;
1359 break;
1360 case READ:
1361 case READ_6:
1362 case READ_10:
1363 hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
1364 /*hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;*/
1365 hostdata->pendingr--;
1366 break;
1367 }
1368}
1369#endif
1370
1371/*
Henne811c9362006-10-03 19:51:59 +02001372 * Function : int NCR5380_select(struct Scsi_Host *instance,
1373 * struct scsi_cmnd *cmd, int tag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 *
1375 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1376 * including ARBITRATION, SELECTION, and initial message out for
1377 * IDENTIFY and queue messages.
1378 *
1379 * Inputs : instance - instantiation of the 5380 driver on which this
1380 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1381 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1382 * the command that is presently connected.
1383 *
1384 * Returns : -1 if selection could not execute for some reason,
1385 * 0 if selection succeeded or failed because the target
1386 * did not respond.
1387 *
1388 * Side effects :
1389 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1390 * with registers as they should have been on entry - ie
1391 * SELECT_ENABLE will be set appropriately, the NCR5380
1392 * will cease to drive any SCSI bus signals.
1393 *
1394 * If successful : I_T_L or I_T_L_Q nexus will be established,
1395 * instance->connected will be set to cmd.
1396 * SELECT interrupt will be disabled.
1397 *
1398 * If failed (no target) : cmd->scsi_done() will be called, and the
1399 * cmd->result host byte set to DID_BAD_TARGET.
1400 */
1401
Henne811c9362006-10-03 19:51:59 +02001402static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd,
1403 int tag)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404{
1405 SETUP_HOSTDATA(instance);
1406 unsigned char tmp[3], phase;
1407 unsigned char *data;
1408 int len;
1409 unsigned long timeout;
1410 unsigned long flags;
1411
1412 hostdata->restart_select = 0;
1413 NCR_PRINT(NDEBUG_ARBITRATION);
1414 ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO,
1415 instance->this_id);
1416
1417 /*
1418 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1419 * data bus during SELECTION.
1420 */
1421
1422 local_irq_save(flags);
1423 if (hostdata->connected) {
1424 local_irq_restore(flags);
1425 return -1;
1426 }
1427 NCR5380_write(TARGET_COMMAND_REG, 0);
1428
1429
1430 /*
1431 * Start arbitration.
1432 */
1433
1434 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1435 NCR5380_write(MODE_REG, MR_ARBITRATE);
1436
1437 local_irq_restore(flags);
1438
1439 /* Wait for arbitration logic to complete */
1440#if NCR_TIMEOUT
1441 {
1442 unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
1443
1444 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1445 && time_before(jiffies, timeout) && !hostdata->connected)
1446 ;
1447 if (time_after_eq(jiffies, timeout))
1448 {
1449 printk("scsi : arbitration timeout at %d\n", __LINE__);
1450 NCR5380_write(MODE_REG, MR_BASE);
1451 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1452 return -1;
1453 }
1454 }
1455#else /* NCR_TIMEOUT */
1456 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1457 && !hostdata->connected);
1458#endif
1459
1460 ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
1461
1462 if (hostdata->connected) {
1463 NCR5380_write(MODE_REG, MR_BASE);
1464 return -1;
1465 }
1466 /*
1467 * The arbitration delay is 2.2us, but this is a minimum and there is
1468 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1469 * the integral nature of udelay().
1470 *
1471 */
1472
1473 udelay(3);
1474
1475 /* Check for lost arbitration */
1476 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1477 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1478 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1479 hostdata->connected) {
1480 NCR5380_write(MODE_REG, MR_BASE);
1481 ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1482 HOSTNO);
1483 return -1;
1484 }
1485
1486 /* after/during arbitration, BSY should be asserted.
1487 IBM DPES-31080 Version S31Q works now */
1488 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1489 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL |
1490 ICR_ASSERT_BSY ) ;
1491
1492 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1493 hostdata->connected) {
1494 NCR5380_write(MODE_REG, MR_BASE);
1495 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1496 ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1497 HOSTNO);
1498 return -1;
1499 }
1500
1501 /*
1502 * Again, bus clear + bus settle time is 1.2us, however, this is
1503 * a minimum so we'll udelay ceil(1.2)
1504 */
1505
1506#ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1507 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1508 udelay(15);
1509#else
1510 udelay(2);
1511#endif
1512
1513 if (hostdata->connected) {
1514 NCR5380_write(MODE_REG, MR_BASE);
1515 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1516 return -1;
1517 }
1518
1519 ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
1520
1521 /*
1522 * Now that we have won arbitration, start Selection process, asserting
1523 * the host and target ID's on the SCSI bus.
1524 */
1525
1526 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
1527
1528 /*
1529 * Raise ATN while SEL is true before BSY goes false from arbitration,
1530 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1531 * phase immediately after selection.
1532 */
1533
1534 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
1535 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
1536 NCR5380_write(MODE_REG, MR_BASE);
1537
1538 /*
1539 * Reselect interrupts must be turned off prior to the dropping of BSY,
1540 * otherwise we will trigger an interrupt.
1541 */
1542
1543 if (hostdata->connected) {
1544 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1545 return -1;
1546 }
1547
1548 NCR5380_write(SELECT_ENABLE_REG, 0);
1549
1550 /*
1551 * The initiator shall then wait at least two deskew delays and release
1552 * the BSY signal.
1553 */
1554 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1555
1556 /* Reset BSY */
1557 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
1558 ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1559
1560 /*
1561 * Something weird happens when we cease to drive BSY - looks
1562 * like the board/chip is letting us do another read before the
1563 * appropriate propagation delay has expired, and we're confusing
1564 * a BSY signal from ourselves as the target's response to SELECTION.
1565 *
1566 * A small delay (the 'C++' frontend breaks the pipeline with an
1567 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1568 * tighter 'C' code breaks and requires this) solves the problem -
1569 * the 1 us delay is arbitrary, and only used because this delay will
1570 * be the same on other platforms and since it works here, it should
1571 * work there.
1572 *
1573 * wingel suggests that this could be due to failing to wait
1574 * one deskew delay.
1575 */
1576
1577 udelay(1);
1578
1579 SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
1580
1581 /*
1582 * The SCSI specification calls for a 250 ms timeout for the actual
1583 * selection.
1584 */
1585
1586 timeout = jiffies + 25;
1587
1588 /*
1589 * XXX very interesting - we're seeing a bounce where the BSY we
1590 * asserted is being reflected / still asserted (propagation delay?)
1591 * and it's detecting as true. Sigh.
1592 */
1593
1594#if 0
1595 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1596 * IO while SEL is true. But again, there are some disks out the in the
1597 * world that do that nevertheless. (Somebody claimed that this announces
1598 * reselection capability of the target.) So we better skip that test and
1599 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
1600 */
1601
1602 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) &
1603 (SR_BSY | SR_IO)));
1604
1605 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) ==
1606 (SR_SEL | SR_IO)) {
1607 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1608 NCR5380_reselect(instance);
1609 printk (KERN_ERR "scsi%d: reselection after won arbitration?\n",
1610 HOSTNO);
1611 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1612 return -1;
1613 }
1614#else
1615 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY));
1616#endif
1617
1618 /*
1619 * No less than two deskew delays after the initiator detects the
1620 * BSY signal is true, it shall release the SEL signal and may
1621 * change the DATA BUS. -wingel
1622 */
1623
1624 udelay(1);
1625
1626 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1627
1628 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1629 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1630 if (hostdata->targets_present & (1 << cmd->device->id)) {
1631 printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
1632 if (hostdata->restart_select)
1633 printk(KERN_NOTICE "\trestart select\n");
1634 NCR_PRINT(NDEBUG_ANY);
1635 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1636 return -1;
1637 }
1638 cmd->result = DID_BAD_TARGET << 16;
1639#ifdef NCR5380_STATS
1640 collect_stats(hostdata, cmd);
1641#endif
1642#ifdef SUPPORT_TAGS
1643 cmd_free_tag( cmd );
1644#endif
1645 cmd->scsi_done(cmd);
1646 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1647 SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
1648 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1649 return 0;
1650 }
1651
1652 hostdata->targets_present |= (1 << cmd->device->id);
1653
1654 /*
1655 * Since we followed the SCSI spec, and raised ATN while SEL
1656 * was true but before BSY was false during selection, the information
1657 * transfer phase should be a MESSAGE OUT phase so that we can send the
1658 * IDENTIFY message.
1659 *
1660 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1661 * message (2 bytes) with a tag ID that we increment with every command
1662 * until it wraps back to 0.
1663 *
1664 * XXX - it turns out that there are some broken SCSI-II devices,
1665 * which claim to support tagged queuing but fail when more than
1666 * some number of commands are issued at once.
1667 */
1668
1669 /* Wait for start of REQ/ACK handshake */
1670 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
1671
1672 SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1673 HOSTNO, cmd->device->id);
1674 tmp[0] = IDENTIFY(1, cmd->device->lun);
1675
1676#ifdef SUPPORT_TAGS
1677 if (cmd->tag != TAG_NONE) {
1678 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1679 tmp[2] = cmd->tag;
1680 len = 3;
1681 } else
1682 len = 1;
1683#else
1684 len = 1;
1685 cmd->tag=0;
1686#endif /* SUPPORT_TAGS */
1687
1688 /* Send message(s) */
1689 data = tmp;
1690 phase = PHASE_MSGOUT;
1691 NCR5380_transfer_pio(instance, &phase, &len, &data);
1692 SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
1693 /* XXX need to handle errors here */
1694 hostdata->connected = cmd;
1695#ifndef SUPPORT_TAGS
1696 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1697#endif
1698#ifdef SUN3_SCSI_VME
1699 dregs->csr |= CSR_INTR;
1700#endif
1701 initialize_SCp(cmd);
1702
1703
1704 return 0;
1705}
1706
1707/*
1708 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1709 * unsigned char *phase, int *count, unsigned char **data)
1710 *
1711 * Purpose : transfers data in given phase using polled I/O
1712 *
1713 * Inputs : instance - instance of driver, *phase - pointer to
1714 * what phase is expected, *count - pointer to number of
1715 * bytes to transfer, **data - pointer to data pointer.
1716 *
1717 * Returns : -1 when different phase is entered without transferring
1718 * maximum number of bytes, 0 if all bytes are transfered or exit
1719 * is in same phase.
1720 *
1721 * Also, *phase, *count, *data are modified in place.
1722 *
1723 * XXX Note : handling for bus free may be useful.
1724 */
1725
1726/*
1727 * Note : this code is not as quick as it could be, however it
1728 * IS 100% reliable, and for the actual data transfer where speed
1729 * counts, we will always do a pseudo DMA or DMA transfer.
1730 */
1731
1732static int NCR5380_transfer_pio( struct Scsi_Host *instance,
1733 unsigned char *phase, int *count,
1734 unsigned char **data)
1735{
1736 register unsigned char p = *phase, tmp;
1737 register int c = *count;
1738 register unsigned char *d = *data;
1739
1740 /*
1741 * The NCR5380 chip will only drive the SCSI bus when the
1742 * phase specified in the appropriate bits of the TARGET COMMAND
1743 * REGISTER match the STATUS REGISTER
1744 */
1745
1746 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1747
1748 do {
1749 /*
1750 * Wait for assertion of REQ, after which the phase bits will be
1751 * valid
1752 */
1753 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
1754
1755 HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
1756
1757 /* Check for phase mismatch */
1758 if ((tmp & PHASE_MASK) != p) {
1759 PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
1760 NCR_PRINT_PHASE(NDEBUG_PIO);
1761 break;
1762 }
1763
1764 /* Do actual transfer from SCSI bus to / from memory */
1765 if (!(p & SR_IO))
1766 NCR5380_write(OUTPUT_DATA_REG, *d);
1767 else
1768 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1769
1770 ++d;
1771
1772 /*
1773 * The SCSI standard suggests that in MSGOUT phase, the initiator
1774 * should drop ATN on the last byte of the message phase
1775 * after REQ has been asserted for the handshake but before
1776 * the initiator raises ACK.
1777 */
1778
1779 if (!(p & SR_IO)) {
1780 if (!((p & SR_MSG) && c > 1)) {
1781 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1782 ICR_ASSERT_DATA);
1783 NCR_PRINT(NDEBUG_PIO);
1784 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1785 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1786 } else {
1787 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1788 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1789 NCR_PRINT(NDEBUG_PIO);
1790 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1791 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1792 }
1793 } else {
1794 NCR_PRINT(NDEBUG_PIO);
1795 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1796 }
1797
1798 while (NCR5380_read(STATUS_REG) & SR_REQ);
1799
1800 HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
1801
1802/*
1803 * We have several special cases to consider during REQ/ACK handshaking :
1804 * 1. We were in MSGOUT phase, and we are on the last byte of the
1805 * message. ATN must be dropped as ACK is dropped.
1806 *
1807 * 2. We are in a MSGIN phase, and we are on the last byte of the
1808 * message. We must exit with ACK asserted, so that the calling
1809 * code may raise ATN before dropping ACK to reject the message.
1810 *
1811 * 3. ACK and ATN are clear and the target may proceed as normal.
1812 */
1813 if (!(p == PHASE_MSGIN && c == 1)) {
1814 if (p == PHASE_MSGOUT && c > 1)
1815 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1816 else
1817 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1818 }
1819 } while (--c);
1820
1821 PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
1822
1823 *count = c;
1824 *data = d;
1825 tmp = NCR5380_read(STATUS_REG);
1826 /* The phase read from the bus is valid if either REQ is (already)
1827 * asserted or if ACK hasn't been released yet. The latter is the case if
1828 * we're in MSGIN and all wanted bytes have been received. */
1829 if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
1830 *phase = tmp & PHASE_MASK;
1831 else
1832 *phase = PHASE_UNKNOWN;
1833
1834 if (!c || (*phase == p))
1835 return 0;
1836 else
1837 return -1;
1838}
1839
1840/*
1841 * Function : do_abort (Scsi_Host *host)
1842 *
1843 * Purpose : abort the currently established nexus. Should only be
1844 * called from a routine which can drop into a
1845 *
1846 * Returns : 0 on success, -1 on failure.
1847 */
1848
1849static int do_abort (struct Scsi_Host *host)
1850{
1851 unsigned char tmp, *msgptr, phase;
1852 int len;
1853
1854 /* Request message out phase */
1855 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1856
1857 /*
1858 * Wait for the target to indicate a valid phase by asserting
1859 * REQ. Once this happens, we'll have either a MSGOUT phase
1860 * and can immediately send the ABORT message, or we'll have some
1861 * other phase and will have to source/sink data.
1862 *
1863 * We really don't care what value was on the bus or what value
1864 * the target sees, so we just handshake.
1865 */
1866
1867 while (!(tmp = NCR5380_read(STATUS_REG)) & SR_REQ);
1868
1869 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1870
1871 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1872 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1873 ICR_ASSERT_ACK);
1874 while (NCR5380_read(STATUS_REG) & SR_REQ);
1875 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1876 }
1877
1878 tmp = ABORT;
1879 msgptr = &tmp;
1880 len = 1;
1881 phase = PHASE_MSGOUT;
1882 NCR5380_transfer_pio (host, &phase, &len, &msgptr);
1883
1884 /*
1885 * If we got here, and the command completed successfully,
1886 * we're about to go into bus free state.
1887 */
1888
1889 return len ? -1 : 0;
1890}
1891
1892#if defined(REAL_DMA)
1893/*
1894 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1895 * unsigned char *phase, int *count, unsigned char **data)
1896 *
1897 * Purpose : transfers data in given phase using either real
1898 * or pseudo DMA.
1899 *
1900 * Inputs : instance - instance of driver, *phase - pointer to
1901 * what phase is expected, *count - pointer to number of
1902 * bytes to transfer, **data - pointer to data pointer.
1903 *
1904 * Returns : -1 when different phase is entered without transferring
1905 * maximum number of bytes, 0 if all bytes or transfered or exit
1906 * is in same phase.
1907 *
1908 * Also, *phase, *count, *data are modified in place.
1909 *
1910 */
1911
1912
1913static int NCR5380_transfer_dma( struct Scsi_Host *instance,
1914 unsigned char *phase, int *count,
1915 unsigned char **data)
1916{
1917 SETUP_HOSTDATA(instance);
1918 register int c = *count;
1919 register unsigned char p = *phase;
1920 unsigned long flags;
1921
1922 /* sanity check */
1923 if(!sun3_dma_setup_done) {
1924 printk("scsi%d: transfer_dma without setup!\n", HOSTNO);
1925 BUG();
1926 }
1927 hostdata->dma_len = c;
1928
1929 DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1930 HOSTNO, (p & SR_IO) ? "reading" : "writing",
1931 c, (p & SR_IO) ? "to" : "from", *data);
1932
1933 /* netbsd turns off ints here, why not be safe and do it too */
1934 local_irq_save(flags);
1935
1936 /* send start chain */
1937 sun3scsi_dma_start(c, *data);
1938
1939 if (p & SR_IO) {
1940 NCR5380_write(TARGET_COMMAND_REG, 1);
1941 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1942 NCR5380_write(INITIATOR_COMMAND_REG, 0);
1943 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1944 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1945 } else {
1946 NCR5380_write(TARGET_COMMAND_REG, 0);
1947 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1948 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA);
1949 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1950 NCR5380_write(START_DMA_SEND_REG, 0);
1951 }
1952
1953#ifdef SUN3_SCSI_VME
1954 dregs->csr |= CSR_DMA_ENABLE;
1955#endif
1956
1957 local_irq_restore(flags);
1958
1959 sun3_dma_active = 1;
1960 return 0;
1961}
1962#endif /* defined(REAL_DMA) */
1963
1964/*
1965 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1966 *
1967 * Purpose : run through the various SCSI phases and do as the target
1968 * directs us to. Operates on the currently connected command,
1969 * instance->connected.
1970 *
1971 * Inputs : instance, instance for which we are doing commands
1972 *
1973 * Side effects : SCSI things happen, the disconnected queue will be
1974 * modified if a command disconnects, *instance->connected will
1975 * change.
1976 *
1977 * XXX Note : we need to watch for bus free or a reset condition here
1978 * to recover from an unexpected bus free condition.
1979 */
1980
1981static void NCR5380_information_transfer (struct Scsi_Host *instance)
1982{
1983 SETUP_HOSTDATA(instance);
1984 unsigned long flags;
1985 unsigned char msgout = NOP;
1986 int sink = 0;
1987 int len;
1988#if defined(REAL_DMA)
1989 int transfersize;
1990#endif
1991 unsigned char *data;
1992 unsigned char phase, tmp, extended_msg[10], old_phase=0xff;
Henne811c9362006-10-03 19:51:59 +02001993 struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001994
1995#ifdef SUN3_SCSI_VME
1996 dregs->csr |= CSR_INTR;
1997#endif
1998
1999 while (1) {
2000 tmp = NCR5380_read(STATUS_REG);
2001 /* We only have a valid SCSI phase when REQ is asserted */
2002 if (tmp & SR_REQ) {
2003 phase = (tmp & PHASE_MASK);
2004 if (phase != old_phase) {
2005 old_phase = phase;
2006 NCR_PRINT_PHASE(NDEBUG_INFORMATION);
2007 }
2008
2009 if(phase == PHASE_CMDOUT) {
2010 void *d;
2011 unsigned long count;
2012
2013 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2014 count = cmd->SCp.buffer->length;
2015 d = SGADDR(cmd->SCp.buffer);
2016 } else {
2017 count = cmd->SCp.this_residual;
2018 d = cmd->SCp.ptr;
2019 }
2020#ifdef REAL_DMA
2021 /* this command setup for dma yet? */
2022 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done
2023 != cmd))
2024 {
Jens Axboe4aff5e22006-08-10 08:44:47 +02002025 if(blk_fs_request(cmd->request)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026 sun3scsi_dma_setup(d, count,
2027 rq_data_dir(cmd->request));
2028 sun3_dma_setup_done = cmd;
2029 }
2030 }
2031#endif
2032#ifdef SUN3_SCSI_VME
2033 dregs->csr |= CSR_INTR;
2034#endif
2035 }
2036
2037
2038 if (sink && (phase != PHASE_MSGOUT)) {
2039 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2040
2041 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
2042 ICR_ASSERT_ACK);
2043 while (NCR5380_read(STATUS_REG) & SR_REQ);
2044 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2045 ICR_ASSERT_ATN);
2046 sink = 0;
2047 continue;
2048 }
2049
2050 switch (phase) {
2051 case PHASE_DATAOUT:
2052#if (NDEBUG & NDEBUG_NO_DATAOUT)
2053 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2054 "aborted\n", HOSTNO);
2055 sink = 1;
2056 do_abort(instance);
2057 cmd->result = DID_ERROR << 16;
2058 cmd->done(cmd);
2059 return;
2060#endif
2061 case PHASE_DATAIN:
2062 /*
2063 * If there is no room left in the current buffer in the
2064 * scatter-gather list, move onto the next one.
2065 */
2066 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2067 ++cmd->SCp.buffer;
2068 --cmd->SCp.buffers_residual;
2069 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2070 cmd->SCp.ptr = SGADDR(cmd->SCp.buffer);
2071
2072 /* ++roman: Try to merge some scatter-buffers if
2073 * they are at contiguous physical addresses.
2074 */
2075// merge_contiguous_buffers( cmd );
2076 INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
2077 HOSTNO, cmd->SCp.this_residual,
2078 cmd->SCp.buffers_residual);
2079 }
2080
2081 /*
2082 * The preferred transfer method is going to be
2083 * PSEUDO-DMA for systems that are strictly PIO,
2084 * since we can let the hardware do the handshaking.
2085 *
2086 * For this to work, we need to know the transfersize
2087 * ahead of time, since the pseudo-DMA code will sit
2088 * in an unconditional loop.
2089 */
2090
2091/* ++roman: I suggest, this should be
2092 * #if def(REAL_DMA)
2093 * instead of leaving REAL_DMA out.
2094 */
2095
2096#if defined(REAL_DMA)
2097// if (!cmd->device->borken &&
2098 if((transfersize =
2099 NCR5380_dma_xfer_len(instance,cmd,phase)) > SUN3_DMA_MINSIZE) {
2100 len = transfersize;
2101 cmd->SCp.phase = phase;
2102
2103 if (NCR5380_transfer_dma(instance, &phase,
2104 &len, (unsigned char **) &cmd->SCp.ptr)) {
2105 /*
2106 * If the watchdog timer fires, all future
2107 * accesses to this device will use the
2108 * polled-IO. */
2109 printk(KERN_NOTICE "scsi%d: switching target %d "
2110 "lun %d to slow handshake\n", HOSTNO,
2111 cmd->device->id, cmd->device->lun);
2112 cmd->device->borken = 1;
2113 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2114 ICR_ASSERT_ATN);
2115 sink = 1;
2116 do_abort(instance);
2117 cmd->result = DID_ERROR << 16;
2118 cmd->done(cmd);
2119 /* XXX - need to source or sink data here, as appropriate */
2120 } else {
2121#ifdef REAL_DMA
2122 /* ++roman: When using real DMA,
2123 * information_transfer() should return after
2124 * starting DMA since it has nothing more to
2125 * do.
2126 */
2127 return;
2128#else
2129 cmd->SCp.this_residual -= transfersize - len;
2130#endif
2131 }
2132 } else
2133#endif /* defined(REAL_DMA) */
2134 NCR5380_transfer_pio(instance, &phase,
2135 (int *) &cmd->SCp.this_residual, (unsigned char **)
2136 &cmd->SCp.ptr);
2137#ifdef REAL_DMA
2138 /* if we had intended to dma that command clear it */
2139 if(sun3_dma_setup_done == cmd)
2140 sun3_dma_setup_done = NULL;
2141#endif
2142
2143 break;
2144 case PHASE_MSGIN:
2145 len = 1;
2146 data = &tmp;
2147 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
2148 NCR5380_transfer_pio(instance, &phase, &len, &data);
2149 cmd->SCp.Message = tmp;
2150
2151 switch (tmp) {
2152 /*
2153 * Linking lets us reduce the time required to get the
2154 * next command out to the device, hopefully this will
2155 * mean we don't waste another revolution due to the delays
2156 * required by ARBITRATION and another SELECTION.
2157 *
2158 * In the current implementation proposal, low level drivers
2159 * merely have to start the next command, pointed to by
2160 * next_link, done() is called as with unlinked commands.
2161 */
2162#ifdef LINKED
2163 case LINKED_CMD_COMPLETE:
2164 case LINKED_FLG_CMD_COMPLETE:
2165 /* Accept message by clearing ACK */
2166 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2167
2168 LNK_PRINTK("scsi%d: target %d lun %d linked command "
2169 "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);
2170
2171 /* Enable reselect interrupts */
2172 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2173 /*
2174 * Sanity check : A linked command should only terminate
2175 * with one of these messages if there are more linked
2176 * commands available.
2177 */
2178
2179 if (!cmd->next_link) {
2180 printk(KERN_NOTICE "scsi%d: target %d lun %d "
2181 "linked command complete, no next_link\n",
2182 HOSTNO, cmd->device->id, cmd->device->lun);
2183 sink = 1;
2184 do_abort (instance);
2185 return;
2186 }
2187
2188 initialize_SCp(cmd->next_link);
2189 /* The next command is still part of this process; copy it
2190 * and don't free it! */
2191 cmd->next_link->tag = cmd->tag;
2192 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2193 LNK_PRINTK("scsi%d: target %d lun %d linked request "
2194 "done, calling scsi_done().\n",
2195 HOSTNO, cmd->device->id, cmd->device->lun);
2196#ifdef NCR5380_STATS
2197 collect_stats(hostdata, cmd);
2198#endif
2199 cmd->scsi_done(cmd);
2200 cmd = hostdata->connected;
2201 break;
2202#endif /* def LINKED */
2203 case ABORT:
2204 case COMMAND_COMPLETE:
2205 /* Accept message by clearing ACK */
2206 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2207 hostdata->connected = NULL;
2208 QU_PRINTK("scsi%d: command for target %d, lun %d "
2209 "completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
2210#ifdef SUPPORT_TAGS
2211 cmd_free_tag( cmd );
2212 if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
2213 /* Turn a QUEUE FULL status into BUSY, I think the
2214 * mid level cannot handle QUEUE FULL :-( (The
2215 * command is retried after BUSY). Also update our
2216 * queue size to the number of currently issued
2217 * commands now.
2218 */
2219 /* ++Andreas: the mid level code knows about
2220 QUEUE_FULL now. */
2221 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
2222 TAG_PRINTK("scsi%d: target %d lun %d returned "
2223 "QUEUE_FULL after %d commands\n",
2224 HOSTNO, cmd->device->id, cmd->device->lun,
2225 ta->nr_allocated);
2226 if (ta->queue_size > ta->nr_allocated)
2227 ta->nr_allocated = ta->queue_size;
2228 }
2229#else
2230 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2231#endif
2232 /* Enable reselect interrupts */
2233 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2234
2235 /*
2236 * I'm not sure what the correct thing to do here is :
2237 *
2238 * If the command that just executed is NOT a request
2239 * sense, the obvious thing to do is to set the result
2240 * code to the values of the stored parameters.
2241 *
2242 * If it was a REQUEST SENSE command, we need some way to
2243 * differentiate between the failure code of the original
2244 * and the failure code of the REQUEST sense - the obvious
2245 * case is success, where we fall through and leave the
2246 * result code unchanged.
2247 *
2248 * The non-obvious place is where the REQUEST SENSE failed
2249 */
2250
2251 if (cmd->cmnd[0] != REQUEST_SENSE)
2252 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2253 else if (status_byte(cmd->SCp.Status) != GOOD)
2254 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2255
2256#ifdef AUTOSENSE
2257 if ((cmd->cmnd[0] != REQUEST_SENSE) &&
2258 (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2259 ASEN_PRINTK("scsi%d: performing request sense\n",
2260 HOSTNO);
2261 cmd->cmnd[0] = REQUEST_SENSE;
2262 cmd->cmnd[1] &= 0xe0;
2263 cmd->cmnd[2] = 0;
2264 cmd->cmnd[3] = 0;
2265 cmd->cmnd[4] = sizeof(cmd->sense_buffer);
2266 cmd->cmnd[5] = 0;
2267 cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]);
2268
2269 cmd->use_sg = 0;
2270 /* this is initialized from initialize_SCp
2271 cmd->SCp.buffer = NULL;
2272 cmd->SCp.buffers_residual = 0;
2273 */
2274 cmd->request_buffer = (char *) cmd->sense_buffer;
2275 cmd->request_bufflen = sizeof(cmd->sense_buffer);
2276
2277 local_irq_save(flags);
2278 LIST(cmd,hostdata->issue_queue);
2279 NEXT(cmd) = hostdata->issue_queue;
Henne811c9362006-10-03 19:51:59 +02002280 hostdata->issue_queue = (struct scsi_cmnd *) cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002281 local_irq_restore(flags);
2282 QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
2283 "issue queue\n", H_NO(cmd));
2284 } else
2285#endif /* def AUTOSENSE */
2286 {
2287#ifdef NCR5380_STATS
2288 collect_stats(hostdata, cmd);
2289#endif
2290 cmd->scsi_done(cmd);
2291 }
2292
2293 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2294 /*
2295 * Restore phase bits to 0 so an interrupted selection,
2296 * arbitration can resume.
2297 */
2298 NCR5380_write(TARGET_COMMAND_REG, 0);
2299
2300 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2301 barrier();
2302
2303 return;
2304 case MESSAGE_REJECT:
2305 /* Accept message by clearing ACK */
2306 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2307 /* Enable reselect interrupts */
2308 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2309 switch (hostdata->last_message) {
2310 case HEAD_OF_QUEUE_TAG:
2311 case ORDERED_QUEUE_TAG:
2312 case SIMPLE_QUEUE_TAG:
2313 /* The target obviously doesn't support tagged
2314 * queuing, even though it announced this ability in
2315 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2316 * clear 'tagged_supported' and lock the LUN, since
2317 * the command is treated as untagged further on.
2318 */
2319 cmd->device->tagged_supported = 0;
2320 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2321 cmd->tag = TAG_NONE;
2322 TAG_PRINTK("scsi%d: target %d lun %d rejected "
2323 "QUEUE_TAG message; tagged queuing "
2324 "disabled\n",
2325 HOSTNO, cmd->device->id, cmd->device->lun);
2326 break;
2327 }
2328 break;
2329 case DISCONNECT:
2330 /* Accept message by clearing ACK */
2331 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2332 local_irq_save(flags);
2333 cmd->device->disconnect = 1;
2334 LIST(cmd,hostdata->disconnected_queue);
2335 NEXT(cmd) = hostdata->disconnected_queue;
2336 hostdata->connected = NULL;
2337 hostdata->disconnected_queue = cmd;
2338 local_irq_restore(flags);
2339 QU_PRINTK("scsi%d: command for target %d lun %d was "
2340 "moved from connected to the "
2341 "disconnected_queue\n", HOSTNO,
2342 cmd->device->id, cmd->device->lun);
2343 /*
2344 * Restore phase bits to 0 so an interrupted selection,
2345 * arbitration can resume.
2346 */
2347 NCR5380_write(TARGET_COMMAND_REG, 0);
2348
2349 /* Enable reselect interrupts */
2350 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2351 /* Wait for bus free to avoid nasty timeouts */
2352 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2353 barrier();
2354#ifdef SUN3_SCSI_VME
2355 dregs->csr |= CSR_DMA_ENABLE;
2356#endif
2357 return;
2358 /*
2359 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2360 * operation, in violation of the SCSI spec so we can safely
2361 * ignore SAVE/RESTORE pointers calls.
2362 *
2363 * Unfortunately, some disks violate the SCSI spec and
2364 * don't issue the required SAVE_POINTERS message before
2365 * disconnecting, and we have to break spec to remain
2366 * compatible.
2367 */
2368 case SAVE_POINTERS:
2369 case RESTORE_POINTERS:
2370 /* Accept message by clearing ACK */
2371 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2372 /* Enable reselect interrupts */
2373 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2374 break;
2375 case EXTENDED_MESSAGE:
2376/*
2377 * Extended messages are sent in the following format :
2378 * Byte
2379 * 0 EXTENDED_MESSAGE == 1
2380 * 1 length (includes one byte for code, doesn't
2381 * include first two bytes)
2382 * 2 code
2383 * 3..length+1 arguments
2384 *
2385 * Start the extended message buffer with the EXTENDED_MESSAGE
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002386 * byte, since spi_print_msg() wants the whole thing.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002387 */
2388 extended_msg[0] = EXTENDED_MESSAGE;
2389 /* Accept first byte by clearing ACK */
2390 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2391
2392 EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
2393
2394 len = 2;
2395 data = extended_msg + 1;
2396 phase = PHASE_MSGIN;
2397 NCR5380_transfer_pio(instance, &phase, &len, &data);
2398 EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2399 (int)extended_msg[1], (int)extended_msg[2]);
2400
2401 if (!len && extended_msg[1] <=
2402 (sizeof (extended_msg) - 1)) {
2403 /* Accept third byte by clearing ACK */
2404 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2405 len = extended_msg[1] - 1;
2406 data = extended_msg + 3;
2407 phase = PHASE_MSGIN;
2408
2409 NCR5380_transfer_pio(instance, &phase, &len, &data);
2410 EXT_PRINTK("scsi%d: message received, residual %d\n",
2411 HOSTNO, len);
2412
2413 switch (extended_msg[2]) {
2414 case EXTENDED_SDTR:
2415 case EXTENDED_WDTR:
2416 case EXTENDED_MODIFY_DATA_POINTER:
2417 case EXTENDED_EXTENDED_IDENTIFY:
2418 tmp = 0;
2419 }
2420 } else if (len) {
2421 printk(KERN_NOTICE "scsi%d: error receiving "
2422 "extended message\n", HOSTNO);
2423 tmp = 0;
2424 } else {
2425 printk(KERN_NOTICE "scsi%d: extended message "
2426 "code %02x length %d is too long\n",
2427 HOSTNO, extended_msg[2], extended_msg[1]);
2428 tmp = 0;
2429 }
2430 /* Fall through to reject message */
2431
2432 /*
2433 * If we get something weird that we aren't expecting,
2434 * reject it.
2435 */
2436 default:
2437 if (!tmp) {
2438 printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002439 spi_print_msg(extended_msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002440 printk("\n");
2441 } else if (tmp != EXTENDED_MESSAGE)
2442 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2443 "message %02x from target %d, lun %d\n",
2444 HOSTNO, tmp, cmd->device->id, cmd->device->lun);
2445 else
2446 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2447 "extended message "
2448 "code %02x, length %d from target %d, lun %d\n",
2449 HOSTNO, extended_msg[1], extended_msg[0],
2450 cmd->device->id, cmd->device->lun);
2451
2452
2453 msgout = MESSAGE_REJECT;
2454 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2455 ICR_ASSERT_ATN);
2456 break;
2457 } /* switch (tmp) */
2458 break;
2459 case PHASE_MSGOUT:
2460 len = 1;
2461 data = &msgout;
2462 hostdata->last_message = msgout;
2463 NCR5380_transfer_pio(instance, &phase, &len, &data);
2464 if (msgout == ABORT) {
2465#ifdef SUPPORT_TAGS
2466 cmd_free_tag( cmd );
2467#else
2468 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2469#endif
2470 hostdata->connected = NULL;
2471 cmd->result = DID_ERROR << 16;
2472#ifdef NCR5380_STATS
2473 collect_stats(hostdata, cmd);
2474#endif
2475 cmd->scsi_done(cmd);
2476 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2477 return;
2478 }
2479 msgout = NOP;
2480 break;
2481 case PHASE_CMDOUT:
2482 len = cmd->cmd_len;
2483 data = cmd->cmnd;
2484 /*
2485 * XXX for performance reasons, on machines with a
2486 * PSEUDO-DMA architecture we should probably
2487 * use the dma transfer function.
2488 */
2489 NCR5380_transfer_pio(instance, &phase, &len,
2490 &data);
2491 break;
2492 case PHASE_STATIN:
2493 len = 1;
2494 data = &tmp;
2495 NCR5380_transfer_pio(instance, &phase, &len, &data);
2496 cmd->SCp.Status = tmp;
2497 break;
2498 default:
2499 printk("scsi%d: unknown phase\n", HOSTNO);
2500 NCR_PRINT(NDEBUG_ANY);
2501 } /* switch(phase) */
2502 } /* if (tmp * SR_REQ) */
2503 } /* while (1) */
2504}
2505
2506/*
2507 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2508 *
2509 * Purpose : does reselection, initializing the instance->connected
Henne811c9362006-10-03 19:51:59 +02002510 * field to point to the struct scsi_cmnd for which the I_T_L or I_T_L_Q
Linus Torvalds1da177e2005-04-16 15:20:36 -07002511 * nexus has been reestablished,
2512 *
2513 * Inputs : instance - this instance of the NCR5380.
2514 *
2515 */
2516
2517/* it might eventually prove necessary to do a dma setup on
2518 reselection, but it doesn't seem to be needed now -- sam */
2519
2520static void NCR5380_reselect (struct Scsi_Host *instance)
2521{
2522 SETUP_HOSTDATA(instance);
2523 unsigned char target_mask;
2524 unsigned char lun;
2525#ifdef SUPPORT_TAGS
2526 unsigned char tag;
2527#endif
2528 unsigned char msg[3];
Henne811c9362006-10-03 19:51:59 +02002529 struct scsi_cmnd *tmp = NULL, *prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002530/* unsigned long flags; */
2531
2532 /*
2533 * Disable arbitration, etc. since the host adapter obviously
2534 * lost, and tell an interrupted NCR5380_select() to restart.
2535 */
2536
2537 NCR5380_write(MODE_REG, MR_BASE);
2538 hostdata->restart_select = 1;
2539
2540 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2541
2542 RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
2543
2544 /*
2545 * At this point, we have detected that our SCSI ID is on the bus,
2546 * SEL is true and BSY was false for at least one bus settle delay
2547 * (400 ns).
2548 *
2549 * We must assert BSY ourselves, until the target drops the SEL
2550 * signal.
2551 */
2552
2553 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2554
2555 while (NCR5380_read(STATUS_REG) & SR_SEL);
2556 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2557
2558 /*
2559 * Wait for target to go into MSGIN.
2560 */
2561
2562 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
2563
2564#if 1
2565 // acknowledge toggle to MSGIN
2566 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN));
2567
2568 // peek at the byte without really hitting the bus
2569 msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG);
2570#endif
2571
2572 if (!(msg[0] & 0x80)) {
2573 printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002574 spi_print_msg(msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002575 do_abort(instance);
2576 return;
2577 }
2578 lun = (msg[0] & 0x07);
2579
2580 /*
2581 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2582 * just reestablished, and remove it from the disconnected queue.
2583 */
2584
Henne811c9362006-10-03 19:51:59 +02002585 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002586 tmp; prev = tmp, tmp = NEXT(tmp) ) {
2587 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2588#ifdef SUPPORT_TAGS
2589 && (tag == tmp->tag)
2590#endif
2591 ) {
2592 if (prev) {
2593 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
2594 NEXT(prev) = NEXT(tmp);
2595 } else {
2596 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2597 hostdata->disconnected_queue = NEXT(tmp);
2598 }
2599 NEXT(tmp) = NULL;
2600 break;
2601 }
2602 }
2603
2604 if (!tmp) {
2605 printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
2606#ifdef SUPPORT_TAGS
2607 "tag %d "
2608#endif
2609 "not in disconnected_queue.\n",
2610 HOSTNO, target_mask, lun
2611#ifdef SUPPORT_TAGS
2612 , tag
2613#endif
2614 );
2615 /*
2616 * Since we have an established nexus that we can't do anything
2617 * with, we must abort it.
2618 */
2619 do_abort(instance);
2620 return;
2621 }
2622#if 1
2623 /* engage dma setup for the command we just saw */
2624 {
2625 void *d;
2626 unsigned long count;
2627
2628 if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) {
2629 count = tmp->SCp.buffer->length;
2630 d = SGADDR(tmp->SCp.buffer);
2631 } else {
2632 count = tmp->SCp.this_residual;
2633 d = tmp->SCp.ptr;
2634 }
2635#ifdef REAL_DMA
2636 /* setup this command for dma if not already */
2637 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done != tmp))
2638 {
2639 sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request));
2640 sun3_dma_setup_done = tmp;
2641 }
2642#endif
2643 }
2644#endif
2645
2646 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
2647 /* Accept message by clearing ACK */
2648 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2649
2650#ifdef SUPPORT_TAGS
2651 /* If the phase is still MSGIN, the target wants to send some more
2652 * messages. In case it supports tagged queuing, this is probably a
2653 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2654 */
2655 tag = TAG_NONE;
2656 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2657 /* Accept previous IDENTIFY message by clearing ACK */
2658 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2659 len = 2;
2660 data = msg+1;
2661 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2662 msg[1] == SIMPLE_QUEUE_TAG)
2663 tag = msg[2];
2664 TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
2665 "reselection\n", HOSTNO, target_mask, lun, tag);
2666 }
2667#endif
2668
2669 hostdata->connected = tmp;
2670 RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2671 HOSTNO, tmp->target, tmp->lun, tmp->tag);
2672}
2673
2674
2675/*
Henne811c9362006-10-03 19:51:59 +02002676 * Function : int NCR5380_abort(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002677 *
2678 * Purpose : abort a command
2679 *
Henne811c9362006-10-03 19:51:59 +02002680 * Inputs : cmd - the struct scsi_cmnd to abort, code - code to set the
Linus Torvalds1da177e2005-04-16 15:20:36 -07002681 * host byte of the result field to, if zero DID_ABORTED is
2682 * used.
2683 *
2684 * Returns : 0 - success, -1 on failure.
2685 *
2686 * XXX - there is no way to abort the command that is currently
2687 * connected, you have to wait for it to complete. If this is
2688 * a problem, we could implement longjmp() / setjmp(), setjmp()
2689 * called where the loop started in NCR5380_main().
2690 */
2691
Henne811c9362006-10-03 19:51:59 +02002692static int NCR5380_abort(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002693{
2694 struct Scsi_Host *instance = cmd->device->host;
2695 SETUP_HOSTDATA(instance);
Henne811c9362006-10-03 19:51:59 +02002696 struct scsi_cmnd *tmp, **prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002697 unsigned long flags;
2698
2699 printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
db9dff32005-04-03 14:53:59 -05002700 scsi_print_command(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002701
2702 NCR5380_print_status (instance);
2703
2704 local_irq_save(flags);
2705
2706 ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
2707 NCR5380_read(BUS_AND_STATUS_REG),
2708 NCR5380_read(STATUS_REG));
2709
2710#if 1
2711/*
2712 * Case 1 : If the command is the currently executing command,
2713 * we'll set the aborted flag and return control so that
2714 * information transfer routine can exit cleanly.
2715 */
2716
2717 if (hostdata->connected == cmd) {
2718
2719 ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO);
2720/*
2721 * We should perform BSY checking, and make sure we haven't slipped
2722 * into BUS FREE.
2723 */
2724
2725/* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2726/*
2727 * Since we can't change phases until we've completed the current
2728 * handshake, we have to source or sink a byte of data if the current
2729 * phase is not MSGOUT.
2730 */
2731
2732/*
2733 * Return control to the executing NCR drive so we can clear the
2734 * aborted flag and get back into our main loop.
2735 */
2736
2737 if (do_abort(instance) == 0) {
2738 hostdata->aborted = 1;
2739 hostdata->connected = NULL;
2740 cmd->result = DID_ABORT << 16;
2741#ifdef SUPPORT_TAGS
2742 cmd_free_tag( cmd );
2743#else
2744 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2745#endif
2746 local_irq_restore(flags);
2747 cmd->scsi_done(cmd);
2748 return SCSI_ABORT_SUCCESS;
2749 } else {
2750/* local_irq_restore(flags); */
2751 printk("scsi%d: abort of connected command failed!\n", HOSTNO);
2752 return SCSI_ABORT_ERROR;
2753 }
2754 }
2755#endif
2756
2757/*
2758 * Case 2 : If the command hasn't been issued yet, we simply remove it
2759 * from the issue queue.
2760 */
Henne811c9362006-10-03 19:51:59 +02002761 for (prev = (struct scsi_cmnd **) &(hostdata->issue_queue),
2762 tmp = (struct scsi_cmnd *) hostdata->issue_queue;
2763 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002764 if (cmd == tmp) {
2765 REMOVE(5, *prev, tmp, NEXT(tmp));
2766 (*prev) = NEXT(tmp);
2767 NEXT(tmp) = NULL;
2768 tmp->result = DID_ABORT << 16;
2769 local_irq_restore(flags);
2770 ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
2771 HOSTNO);
2772 /* Tagged queuing note: no tag to free here, hasn't been assigned
2773 * yet... */
2774 tmp->scsi_done(tmp);
2775 return SCSI_ABORT_SUCCESS;
2776 }
2777
2778/*
2779 * Case 3 : If any commands are connected, we're going to fail the abort
2780 * and let the high level SCSI driver retry at a later time or
2781 * issue a reset.
2782 *
2783 * Timeouts, and therefore aborted commands, will be highly unlikely
2784 * and handling them cleanly in this situation would make the common
2785 * case of noresets less efficient, and would pollute our code. So,
2786 * we fail.
2787 */
2788
2789 if (hostdata->connected) {
2790 local_irq_restore(flags);
2791 ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
2792 return SCSI_ABORT_SNOOZE;
2793 }
2794
2795/*
2796 * Case 4: If the command is currently disconnected from the bus, and
2797 * there are no connected commands, we reconnect the I_T_L or
2798 * I_T_L_Q nexus associated with it, go into message out, and send
2799 * an abort message.
2800 *
2801 * This case is especially ugly. In order to reestablish the nexus, we
2802 * need to call NCR5380_select(). The easiest way to implement this
2803 * function was to abort if the bus was busy, and let the interrupt
2804 * handler triggered on the SEL for reselect take care of lost arbitrations
2805 * where necessary, meaning interrupts need to be enabled.
2806 *
2807 * When interrupts are enabled, the queues may change - so we
2808 * can't remove it from the disconnected queue before selecting it
2809 * because that could cause a failure in hashing the nexus if that
2810 * device reselected.
2811 *
2812 * Since the queues may change, we can't use the pointers from when we
2813 * first locate it.
2814 *
2815 * So, we must first locate the command, and if NCR5380_select()
2816 * succeeds, then issue the abort, relocate the command and remove
2817 * it from the disconnected queue.
2818 */
2819
Henne811c9362006-10-03 19:51:59 +02002820 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002821 tmp = NEXT(tmp))
2822 if (cmd == tmp) {
2823 local_irq_restore(flags);
2824 ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
2825
2826 if (NCR5380_select (instance, cmd, (int) cmd->tag))
2827 return SCSI_ABORT_BUSY;
2828
2829 ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
2830
2831 do_abort (instance);
2832
2833 local_irq_save(flags);
Henne811c9362006-10-03 19:51:59 +02002834 for (prev = (struct scsi_cmnd **) &(hostdata->disconnected_queue),
2835 tmp = (struct scsi_cmnd *) hostdata->disconnected_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002836 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
2837 if (cmd == tmp) {
2838 REMOVE(5, *prev, tmp, NEXT(tmp));
2839 *prev = NEXT(tmp);
2840 NEXT(tmp) = NULL;
2841 tmp->result = DID_ABORT << 16;
2842 /* We must unlock the tag/LUN immediately here, since the
2843 * target goes to BUS FREE and doesn't send us another
2844 * message (COMMAND_COMPLETE or the like)
2845 */
2846#ifdef SUPPORT_TAGS
2847 cmd_free_tag( tmp );
2848#else
2849 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2850#endif
2851 local_irq_restore(flags);
2852 tmp->scsi_done(tmp);
2853 return SCSI_ABORT_SUCCESS;
2854 }
2855 }
2856
2857/*
2858 * Case 5 : If we reached this point, the command was not found in any of
2859 * the queues.
2860 *
2861 * We probably reached this point because of an unlikely race condition
2862 * between the command completing successfully and the abortion code,
2863 * so we won't panic, but we will notify the user in case something really
2864 * broke.
2865 */
2866
2867 local_irq_restore(flags);
2868 printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully\n"
2869 KERN_INFO " before abortion\n", HOSTNO);
2870
2871 return SCSI_ABORT_NOT_RUNNING;
2872}
2873
2874
2875/*
Henne811c9362006-10-03 19:51:59 +02002876 * Function : int NCR5380_bus_reset(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002877 *
2878 * Purpose : reset the SCSI bus.
2879 *
2880 * Returns : SCSI_RESET_WAKEUP
2881 *
2882 */
2883
Henne811c9362006-10-03 19:51:59 +02002884static int NCR5380_bus_reset(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002885{
2886 SETUP_HOSTDATA(cmd->device->host);
2887 int i;
2888 unsigned long flags;
2889#if 1
Henne811c9362006-10-03 19:51:59 +02002890 struct scsi_cmnd *connected, *disconnected_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002891#endif
2892
2893
2894 NCR5380_print_status (cmd->device->host);
2895
2896 /* get in phase */
2897 NCR5380_write( TARGET_COMMAND_REG,
2898 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
2899 /* assert RST */
2900 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
2901 udelay (40);
2902 /* reset NCR registers */
2903 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2904 NCR5380_write( MODE_REG, MR_BASE );
2905 NCR5380_write( TARGET_COMMAND_REG, 0 );
2906 NCR5380_write( SELECT_ENABLE_REG, 0 );
2907 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2908 * through anymore ... */
2909 (void)NCR5380_read( RESET_PARITY_INTERRUPT_REG );
2910
2911#if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
2912 /* XXX see below XXX */
2913
2914 /* MSch: old-style reset: actually abort all command processing here */
2915
2916 /* After the reset, there are no more connected or disconnected commands
2917 * and no busy units; to avoid problems with re-inserting the commands
2918 * into the issue_queue (via scsi_done()), the aborted commands are
2919 * remembered in local variables first.
2920 */
2921 local_irq_save(flags);
Henne811c9362006-10-03 19:51:59 +02002922 connected = (struct scsi_cmnd *)hostdata->connected;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002923 hostdata->connected = NULL;
Henne811c9362006-10-03 19:51:59 +02002924 disconnected_queue = (struct scsi_cmnd *)hostdata->disconnected_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002925 hostdata->disconnected_queue = NULL;
2926#ifdef SUPPORT_TAGS
2927 free_all_tags();
2928#endif
2929 for( i = 0; i < 8; ++i )
2930 hostdata->busy[i] = 0;
2931#ifdef REAL_DMA
2932 hostdata->dma_len = 0;
2933#endif
2934 local_irq_restore(flags);
2935
2936 /* In order to tell the mid-level code which commands were aborted,
2937 * set the command status to DID_RESET and call scsi_done() !!!
2938 * This ultimately aborts processing of these commands in the mid-level.
2939 */
2940
2941 if ((cmd = connected)) {
2942 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2943 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2944 cmd->scsi_done( cmd );
2945 }
2946
2947 for (i = 0; (cmd = disconnected_queue); ++i) {
2948 disconnected_queue = NEXT(cmd);
2949 NEXT(cmd) = NULL;
2950 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2951 cmd->scsi_done( cmd );
2952 }
2953 if (i > 0)
2954 ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
2955
2956
2957 /* since all commands have been explicitly terminated, we need to tell
2958 * the midlevel code that the reset was SUCCESSFUL, and there is no
2959 * need to 'wake up' the commands by a request_sense
2960 */
2961 return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
2962#else /* 1 */
2963
2964 /* MSch: new-style reset handling: let the mid-level do what it can */
2965
2966 /* ++guenther: MID-LEVEL IS STILL BROKEN.
2967 * Mid-level is supposed to requeue all commands that were active on the
2968 * various low-level queues. In fact it does this, but that's not enough
2969 * because all these commands are subject to timeout. And if a timeout
2970 * happens for any removed command, *_abort() is called but all queues
2971 * are now empty. Abort then gives up the falcon lock, which is fatal,
2972 * since the mid-level will queue more commands and must have the lock
2973 * (it's all happening inside timer interrupt handler!!).
2974 * Even worse, abort will return NOT_RUNNING for all those commands not
2975 * on any queue, so they won't be retried ...
2976 *
2977 * Conclusion: either scsi.c disables timeout for all resetted commands
2978 * immediately, or we lose! As of linux-2.0.20 it doesn't.
2979 */
2980
2981 /* After the reset, there are no more connected or disconnected commands
2982 * and no busy units; so clear the low-level status here to avoid
2983 * conflicts when the mid-level code tries to wake up the affected
2984 * commands!
2985 */
2986
2987 if (hostdata->issue_queue)
2988 ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
2989 if (hostdata->connected)
2990 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2991 if (hostdata->disconnected_queue)
2992 ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
2993
2994 local_irq_save(flags);
2995 hostdata->issue_queue = NULL;
2996 hostdata->connected = NULL;
2997 hostdata->disconnected_queue = NULL;
2998#ifdef SUPPORT_TAGS
2999 free_all_tags();
3000#endif
3001 for( i = 0; i < 8; ++i )
3002 hostdata->busy[i] = 0;
3003#ifdef REAL_DMA
3004 hostdata->dma_len = 0;
3005#endif
3006 local_irq_restore(flags);
3007
3008 /* we did no complete reset of all commands, so a wakeup is required */
3009 return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;
3010#endif /* 1 */
3011}
3012
3013/* Local Variables: */
3014/* tab-width: 8 */
3015/* End: */