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*/
1 /*
2 * NCR 5380 generic driver routines. These should make it *trivial*
3 * to implement 5380 SCSI drivers under Linux with a non-trantor
4 * architecture.
5 *
6 * Note that these routines also work with NR53c400 family chips.
7 *
8 * Copyright 1993, Drew Eckhardt
9 * Visionary Computing
10 * (Unix and Linux consulting and custom programming)
11 * drew@colorado.edu
12 * +1 (303) 666-5836
13 *
14 * DISTRIBUTION RELEASE 6.
15 *
16 * For more information, please consult
17 *
18 * NCR 5380 Family
19 * SCSI Protocol Controller
20 * Databook
21 *
22 * NCR Microelectronics
23 * 1635 Aeroplaza Drive
24 * Colorado Springs, CO 80916
25 * 1+ (719) 578-3400
26 * 1+ (800) 334-5454
27 */
28
29 /*
30 * ++roman: To port the 5380 driver to the Atari, I had to do some changes in
31 * this file, too:
32 *
33 * - Some of the debug statements were incorrect (undefined variables and the
34 * like). I fixed that.
35 *
36 * - In information_transfer(), I think a #ifdef was wrong. Looking at the
37 * possible DMA transfer size should also happen for REAL_DMA. I added this
38 * in the #if statement.
39 *
40 * - When using real DMA, information_transfer() should return in a DATAOUT
41 * phase after starting the DMA. It has nothing more to do.
42 *
43 * - The interrupt service routine should run main after end of DMA, too (not
44 * only after RESELECTION interrupts). Additionally, it should _not_ test
45 * for more interrupts after running main, since a DMA process may have
46 * been started and interrupts are turned on now. The new int could happen
47 * inside the execution of NCR5380_intr(), leading to recursive
48 * calls.
49 *
50 * - I've added a function merge_consecutive_buffers() that trys to
51 * merge scatter-gather buffers that are located at consecutive
52 * physical addresses and can be processed with the same DMA setup.
53 * Since most scatter-gather operations work on a page (4K) of
54 * 4 buffers (1K), in more than 90% of all cases three interrupts and
55 * DMA setup actions are saved.
56 *
57 */
58
59 /*
60 * +++roman: I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL,
61 * PSEUDO_DMA and USLEEP, because these were messing up
62 * readability and will never be needed for Atari SCSI.
63 */
64
65
66 /*
67 * $Log: atari_NCR5380.c,v $
68 * Revision 1.2 1996/04/04 13:30:22 root
69 * interrupts more like the pc
70 *
71 * Revision 1.1 1996/03/20 17:51:35 root
72 * Initial revision
73 *
74 * Revision 1.2 1994/11/26 03:38:32 hamish
75 * v0.9pl4
76 *
77 * Revision 1.1 1994/11/08 03:25:43 hamish
78 * Initial revision
79 *
80 * Revision 1.5 1994/01/19 09:14:57 drew
81 * Fixed udelay() hack that was being used on DATAOUT phases
82 * instead of a proper wait for the final handshake.
83 *
84 * Revision 1.4 1994/01/19 06:44:25 drew
85 * *** empty log message ***
86 *
87 * Revision 1.3 1994/01/19 05:24:40 drew
88 * Added support for TCR LAST_BYTE_SENT bit.
89 *
90 * Revision 1.2 1994/01/15 06:14:11 drew
91 * REAL DMA support, bug fixes.
92 *
93 * Revision 1.1 1994/01/15 06:00:54 drew
94 * Initial revision
95 *
96 */
97
98 /*
99 * Further development / testing that should be done :
100 * 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete
101 * code so that everything does the same thing that's done at the
102 * end of a pseudo-DMA read operation.
103 *
104 * 2. Fix REAL_DMA (interrupt driven, polled works fine) -
105 * basically, transfer size needs to be reduced by one
106 * and the last byte read as is done with PSEUDO_DMA.
107 *
108 * 3. Test USLEEP code
109 *
110 * 4. Test SCSI-II tagged queueing (I have no devices which support
111 * tagged queueing)
112 *
113 * 5. Test linked command handling code after Eric is ready with
114 * the high level code.
115 */
116
117 #if (NDEBUG & NDEBUG_LISTS)
118 #define LIST(x,y) \
119 { printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); \
120 if ((x)==(y)) udelay(5); }
121 #define REMOVE(w,x,y,z) \
122 { printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, \
123 (void*)(w), (void*)(x), (void*)(y), (void*)(z)); \
124 if ((x)==(y)) udelay(5); }
125 #else
126 #define LIST(x,y)
127 #define REMOVE(w,x,y,z)
128 #endif
129
130 #ifndef notyet
131 #undef LINKED
132 #endif
133
134 /*
135 * Design
136 * Issues :
137 *
138 * The other Linux SCSI drivers were written when Linux was Intel PC-only,
139 * and specifically for each board rather than each chip. This makes their
140 * adaptation to platforms like the Mac (Some of which use NCR5380's)
141 * more difficult than it has to be.
142 *
143 * Also, many of the SCSI drivers were written before the command queuing
144 * routines were implemented, meaning their implementations of queued
145 * commands were hacked on rather than designed in from the start.
146 *
147 * When I designed the Linux SCSI drivers I figured that
148 * while having two different SCSI boards in a system might be useful
149 * for debugging things, two of the same type wouldn't be used.
150 * Well, I was wrong and a number of users have mailed me about running
151 * multiple high-performance SCSI boards in a server.
152 *
153 * Finally, when I get questions from users, I have no idea what
154 * revision of my driver they are running.
155 *
156 * This driver attempts to address these problems :
157 * This is a generic 5380 driver. To use it on a different platform,
158 * one simply writes appropriate system specific macros (ie, data
159 * transfer - some PC's will use the I/O bus, 68K's must use
160 * memory mapped) and drops this file in their 'C' wrapper.
161 *
162 * As far as command queueing, two queues are maintained for
163 * each 5380 in the system - commands that haven't been issued yet,
164 * and commands that are currently executing. This means that an
165 * unlimited number of commands may be queued, letting
166 * more commands propagate from the higher driver levels giving higher
167 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
168 * allowing multiple commands to propagate all the way to a SCSI-II device
169 * while a command is already executing.
170 *
171 * To solve the multiple-boards-in-the-same-system problem,
172 * there is a separate instance structure for each instance
173 * of a 5380 in the system. So, multiple NCR5380 drivers will
174 * be able to coexist with appropriate changes to the high level
175 * SCSI code.
176 *
177 * A NCR5380_PUBLIC_REVISION macro is provided, with the release
178 * number (updated for each public release) printed by the
179 * NCR5380_print_options command, which should be called from the
180 * wrapper detect function, so that I know what release of the driver
181 * users are using.
182 *
183 * Issues specific to the NCR5380 :
184 *
185 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
186 * piece of hardware that requires you to sit in a loop polling for
187 * the REQ signal as long as you are connected. Some devices are
188 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
189 * while doing long seek operations.
190 *
191 * The workaround for this is to keep track of devices that have
192 * disconnected. If the device hasn't disconnected, for commands that
193 * should disconnect, we do something like
194 *
195 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
196 *
197 * Some tweaking of N and M needs to be done. An algorithm based
198 * on "time to data" would give the best results as long as short time
199 * to datas (ie, on the same track) were considered, however these
200 * broken devices are the exception rather than the rule and I'd rather
201 * spend my time optimizing for the normal case.
202 *
203 * Architecture :
204 *
205 * At the heart of the design is a coroutine, NCR5380_main,
206 * which is started when not running by the interrupt handler,
207 * timer, and queue command function. It attempts to establish
208 * I_T_L or I_T_L_Q nexuses by removing the commands from the
209 * issue queue and calling NCR5380_select() if a nexus
210 * is not established.
211 *
212 * Once a nexus is established, the NCR5380_information_transfer()
213 * phase goes through the various phases as instructed by the target.
214 * if the target goes into MSG IN and sends a DISCONNECT message,
215 * the command structure is placed into the per instance disconnected
216 * queue, and NCR5380_main tries to find more work. If USLEEP
217 * was defined, and the target is idle for too long, the system
218 * will try to sleep.
219 *
220 * If a command has disconnected, eventually an interrupt will trigger,
221 * calling NCR5380_intr() which will in turn call NCR5380_reselect
222 * to reestablish a nexus. This will run main if necessary.
223 *
224 * On command termination, the done function will be called as
225 * appropriate.
226 *
227 * SCSI pointers are maintained in the SCp field of SCSI command
228 * structures, being initialized after the command is connected
229 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
230 * Note that in violation of the standard, an implicit SAVE POINTERS operation
231 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
232 */
233
234 /*
235 * Using this file :
236 * This file a skeleton Linux SCSI driver for the NCR 5380 series
237 * of chips. To use it, you write a architecture specific functions
238 * and macros and include this file in your driver.
239 *
240 * These macros control options :
241 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
242 * for commands that return with a CHECK CONDITION status.
243 *
244 * LINKED - if defined, linked commands are supported.
245 *
246 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
247 *
248 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
249 *
250 * These macros MUST be defined :
251 *
252 * NCR5380_read(register) - read from the specified register
253 *
254 * NCR5380_write(register, value) - write to the specific register
255 *
256 * Either real DMA *or* pseudo DMA may be implemented
257 * REAL functions :
258 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
259 * Note that the DMA setup functions should return the number of bytes
260 * that they were able to program the controller for.
261 *
262 * Also note that generic i386/PC versions of these macros are
263 * available as NCR5380_i386_dma_write_setup,
264 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
265 *
266 * NCR5380_dma_write_setup(instance, src, count) - initialize
267 * NCR5380_dma_read_setup(instance, dst, count) - initialize
268 * NCR5380_dma_residual(instance); - residual count
269 *
270 * PSEUDO functions :
271 * NCR5380_pwrite(instance, src, count)
272 * NCR5380_pread(instance, dst, count);
273 *
274 * If nothing specific to this implementation needs doing (ie, with external
275 * hardware), you must also define
276 *
277 * NCR5380_queue_command
278 * NCR5380_reset
279 * NCR5380_abort
280 * NCR5380_proc_info
281 *
282 * to be the global entry points into the specific driver, ie
283 * #define NCR5380_queue_command t128_queue_command.
284 *
285 * If this is not done, the routines will be defined as static functions
286 * with the NCR5380* names and the user must provide a globally
287 * accessible wrapper function.
288 *
289 * The generic driver is initialized by calling NCR5380_init(instance),
290 * after setting the appropriate host specific fields and ID. If the
291 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
292 * possible) function may be used. Before the specific driver initialization
293 * code finishes, NCR5380_print_options should be called.
294 */
295
296 static struct Scsi_Host *first_instance = NULL;
297 static Scsi_Host_Template *the_template = NULL;
298
299 /* Macros ease life... :-) */
300 #define SETUP_HOSTDATA(in) \
301 struct NCR5380_hostdata *hostdata = \
302 (struct NCR5380_hostdata *)(in)->hostdata
303 #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
304
305 #define NEXT(cmd) ((Scsi_Cmnd *)((cmd)->host_scribble))
306 #define NEXTADDR(cmd) ((Scsi_Cmnd **)&((cmd)->host_scribble))
307
308 #define HOSTNO instance->host_no
309 #define H_NO(cmd) (cmd)->host->host_no
310
311 #ifdef SUPPORT_TAGS
312
313 /*
314 * Functions for handling tagged queuing
315 * =====================================
316 *
317 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
318 *
319 * Using consecutive numbers for the tags is no good idea in my eyes. There
320 * could be wrong re-usings if the counter (8 bit!) wraps and some early
321 * command has been preempted for a long time. My solution: a bitfield for
322 * remembering used tags.
323 *
324 * There's also the problem that each target has a certain queue size, but we
325 * cannot know it in advance :-( We just see a QUEUE_FULL status being
326 * returned. So, in this case, the driver internal queue size assumption is
327 * reduced to the number of active tags if QUEUE_FULL is returned by the
328 * target. The command is returned to the mid-level, but with status changed
329 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
330 * correctly.
331 *
332 * We're also not allowed running tagged commands as long as an untagged
333 * command is active. And REQUEST SENSE commands after a contingent allegiance
334 * condition _must_ be untagged. To keep track whether an untagged command has
335 * been issued, the host->busy array is still employed, as it is without
336 * support for tagged queuing.
337 *
338 * One could suspect that there are possible race conditions between
339 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
340 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
341 * which already guaranteed to be running at most once. It is also the only
342 * place where tags/LUNs are allocated. So no other allocation can slip
343 * between that pair, there could only happen a reselection, which can free a
344 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
345 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
346 */
347
348 /* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
349 #undef TAG_NONE
350 #define TAG_NONE 0xff
351
352 /* For the m68k, the number of bits in 'allocated' must be a multiple of 32! */
353 #if (MAX_TAGS % 32) != 0
354 #error "MAX_TAGS must be a multiple of 32!"
355 #endif
356
357 typedef struct {
358 char allocated[MAX_TAGS/8];
359 int nr_allocated;
360 int queue_size;
361 } TAG_ALLOC;
362
363 static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */
364
365
366 static void init_tags( void )
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*/
367 {
368 int target, lun;
369 TAG_ALLOC *ta;
370
371 if (!setup_use_tagged_queuing)
372 return;
373
374 for( target = 0; target < 8; ++target ) {
375 for( lun = 0; lun < 8; ++lun ) {
376 ta = &TagAlloc[target][lun];
377 memset( &ta->allocated, 0, MAX_TAGS/8 );
378 ta->nr_allocated = 0;
379 /* At the beginning, assume the maximum queue size we could
380 * support (MAX_TAGS). This value will be decreased if the target
381 * returns QUEUE_FULL status.
382 */
383 ta->queue_size = MAX_TAGS;
384 }
385 }
386 }
387
388
389 /* Check if we can issue a command to this LUN: First see if the LUN is marked
390 * busy by an untagged command. If the command should use tagged queuing, also
391 * check that there is a free tag and the target's queue won't overflow. This
392 * function should be called with interrupts disabled to avoid race
393 * conditions.
394 */
395
396 static int is_lun_busy( Scsi_Cmnd *cmd, int should_be_tagged )
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*/
397 {
398 SETUP_HOSTDATA(cmd->host);
399
400 if (hostdata->busy[cmd->target] & (1 << cmd->lun))
401 return( 1 );
402 if (!should_be_tagged ||
403 !setup_use_tagged_queuing || !cmd->device->tagged_supported)
404 return( 0 );
405 if (TagAlloc[cmd->target][cmd->lun].nr_allocated >=
406 TagAlloc[cmd->target][cmd->lun].queue_size ) {
407 #if (NDEBUG & NDEBUG_TAGS)
408 printk( "scsi%d: target %d lun %d: no free tags\n",
409 H_NO(cmd), cmd->target, cmd->lun );
410 #endif
411 return( 1 );
412 }
413 return( 0 );
414 }
415
416
417 /* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
418 * must be called before!), or reserve the LUN in 'busy' if the command is
419 * untagged.
420 */
421
422 static void cmd_get_tag( Scsi_Cmnd *cmd, int should_be_tagged )
/* */
423 {
424 SETUP_HOSTDATA(cmd->host);
425
426 /* If we or the target don't support tagged queuing, allocate the LUN for
427 * an untagged command.
428 */
429 if (!should_be_tagged ||
430 !setup_use_tagged_queuing || !cmd->device->tagged_supported) {
431 cmd->tag = TAG_NONE;
432 hostdata->busy[cmd->target] |= (1 << cmd->lun);
433 #if (NDEBUG & NDEBUG_TAGS)
434 printk( "scsi%d: target %d lun %d now allocated by untagged command\n",
435 H_NO(cmd), cmd->target, cmd->lun );
436 #endif
437 }
438 else {
439 TAG_ALLOC *ta = &TagAlloc[cmd->target][cmd->lun];
440
441 cmd->tag = find_first_zero_bit( &ta->allocated, MAX_TAGS );
442 set_bit( cmd->tag, &ta->allocated );
443 ta->nr_allocated++;
444 #if (NDEBUG & NDEBUG_TAGS)
445 printk( "scsi%d: using tag %d for target %d lun %d "
446 "(now %d tags in use)\n",
447 H_NO(cmd), cmd->tag, cmd->target, cmd->lun,
448 ta->nr_allocated );
449 #endif
450 }
451 }
452
453
454 /* Mark the tag of command 'cmd' as free, or in case of an untagged command,
455 * unlock the LUN.
456 */
457
458 static void cmd_free_tag( Scsi_Cmnd *cmd )
/* */
459 {
460 SETUP_HOSTDATA(cmd->host);
461
462 if (cmd->tag == TAG_NONE) {
463 hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
464 #if (NDEBUG & NDEBUG_TAGS)
465 printk( "scsi%d: target %d lun %d untagged cmd finished\n",
466 H_NO(cmd), cmd->target, cmd->lun );
467 #endif
468 }
469 else if (cmd->tag >= MAX_TAGS) {
470 printk( "scsi%d: trying to free bad tag %d!\n",
471 H_NO(cmd), cmd->tag );
472 }
473 else {
474 TAG_ALLOC *ta = &TagAlloc[cmd->target][cmd->lun];
475 clear_bit( cmd->tag, &ta->allocated );
476 ta->nr_allocated--;
477 #if (NDEBUG & NDEBUG_TAGS)
478 printk( "scsi%d: freed tag %d for target %d lun %d\n",
479 H_NO(cmd), cmd->tag, cmd->target, cmd->lun );
480 #endif
481 }
482 }
483
484
485 #if 0
486 static void free_all_tags( void )
/* */
487 {
488 int target, lun;
489 TAG_ALLOC *ta;
490
491 if (!setup_use_tagged_queuing)
492 return;
493
494 for( target = 0; target < 8; ++target ) {
495 for( lun = 0; lun < 8; ++lun ) {
496 ta = &TagAlloc[target][lun];
497 memset( &ta->allocated, 0, MAX_TAGS/8 );
498 ta->nr_allocated = 0;
499 }
500 }
501 }
502 #endif
503
504 #endif /* SUPPORT_TAGS */
505
506
507 /*
508 * Function: void merge_consecutive_buffers( Scsi_Cmnd *cmd )
509 *
510 * Purpose: Try to merge several scatter-gather requests into one DMA
511 * transfer. This is possible if the scatter buffers lie on
512 * physical consecutive addresses.
513 *
514 * Parameters: Scsi_Cmnd *cmd
515 * The command to work on. The first scatter buffer's data are
516 * assumed to be already transfered into ptr/this_residual.
517 */
518
519 /* A special issue is when the buffer is exactly at the end of the
520 * last physical memory chunk: VTOP would have to calculate the
521 * physical address just 1 byte behind the end of physical memory. But
522 * it will panic if given this address :-( So we need to avoid calling
523 * VTOP on addresses that don't exist. This is done by keeping
524 * 'endadr' to be the real end address of the buffer, not one byte
525 * more (which would be easier).
526 */
527
528 static void merge_consecutive_buffers( Scsi_Cmnd *cmd )
/* */
529 {
530 unsigned long endadr;
531 #if (NDEBUG & NDEBUG_MERGING)
532 unsigned long oldlen = cmd->SCp.this_residual;
533 int cnt = 1;
534 #endif
535
536 for( endadr = VTOP(cmd->SCp.ptr + cmd->SCp.this_residual - 1);
537 cmd->SCp.buffers_residual &&
538 VTOP( (cmd->SCp.buffer+1)->address ) == endadr + 1; ) {
539
540 #if (NDEBUG & NDEBUG_MERGING)
541 printk( "%08lx == %08lx -> merging\n",
542 VTOP( (cmd->SCp.buffer+1)->address ), endadr );
543 ++cnt;
544 #endif
545 ++cmd->SCp.buffer;
546 --cmd->SCp.buffers_residual;
547 cmd->SCp.this_residual += cmd->SCp.buffer->length;
548 endadr += cmd->SCp.buffer->length;
549 }
550 #if (NDEBUG & NDEBUG_MERGING)
551 if (oldlen != cmd->SCp.this_residual)
552 printk( "merged %d buffers from %08lx, new length %08lx\n",
553 cnt, (long)(cmd->SCp.ptr), cmd->SCp.this_residual );
554 #endif
555 }
556
557 /*
558 * Function : void initialize_SCp(Scsi_Cmnd *cmd)
559 *
560 * Purpose : initialize the saved data pointers for cmd to point to the
561 * start of the buffer.
562 *
563 * Inputs : cmd - Scsi_Cmnd structure to have pointers reset.
564 */
565
566 static __inline__ void initialize_SCp(Scsi_Cmnd *cmd)
/* */
567 {
568 /*
569 * Initialize the Scsi Pointer field so that all of the commands in the
570 * various queues are valid.
571 */
572
573 if (cmd->use_sg) {
574 cmd->SCp.buffer = (struct scatterlist *) cmd->buffer;
575 cmd->SCp.buffers_residual = cmd->use_sg - 1;
576 cmd->SCp.ptr = (char *) cmd->SCp.buffer->address;
577 cmd->SCp.this_residual = cmd->SCp.buffer->length;
578 /* ++roman: Try to merge some scatter-buffers if they are at
579 * consecutive physical addresses.
580 */
581 merge_consecutive_buffers( cmd );
582 } else {
583 cmd->SCp.buffer = NULL;
584 cmd->SCp.buffers_residual = 0;
585 cmd->SCp.ptr = (char *) cmd->request_buffer;
586 cmd->SCp.this_residual = cmd->request_bufflen;
587 }
588 }
589
590 #include <linux/config.h>
591 #include <linux/delay.h>
592
593 #ifdef NDEBUG
594 static struct {
595 unsigned char mask;
596 const char * name;}
597 signals[] = {{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" },
598 { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" },
599 { SR_SEL, "SEL" }, {0, NULL}},
600 basrs[] = {{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}},
601 icrs[] = {{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
602 {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"},
603 {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"},
604 {0, NULL}},
605 mrs[] = {{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"},
606 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR,
607 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"},
608 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
609 {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"},
610 {0, NULL}};
611
612 /*
613 * Function : void NCR5380_print(struct Scsi_Host *instance)
614 *
615 * Purpose : print the SCSI bus signals for debugging purposes
616 *
617 * Input : instance - which NCR5380
618 */
619
620 static void NCR5380_print(struct Scsi_Host *instance) {
/* */
621 unsigned char status, data, basr, mr, icr, i;
622 unsigned long flags;
623
624 save_flags(flags);
625 cli();
626 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
627 status = NCR5380_read(STATUS_REG);
628 mr = NCR5380_read(MODE_REG);
629 icr = NCR5380_read(INITIATOR_COMMAND_REG);
630 basr = NCR5380_read(BUS_AND_STATUS_REG);
631 restore_flags(flags);
632 printk("STATUS_REG: %02x ", status);
633 for (i = 0; signals[i].mask ; ++i)
634 if (status & signals[i].mask)
635 printk(",%s", signals[i].name);
636 printk("\nBASR: %02x ", basr);
637 for (i = 0; basrs[i].mask ; ++i)
638 if (basr & basrs[i].mask)
639 printk(",%s", basrs[i].name);
640 printk("\nICR: %02x ", icr);
641 for (i = 0; icrs[i].mask; ++i)
642 if (icr & icrs[i].mask)
643 printk(",%s", icrs[i].name);
644 printk("\nMODE: %02x ", mr);
645 for (i = 0; mrs[i].mask; ++i)
646 if (mr & mrs[i].mask)
647 printk(",%s", mrs[i].name);
648 printk("\n");
649 }
650
651 static struct {
652 unsigned char value;
653 const char *name;
654 } phases[] = {
655 {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
656 {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
657 {PHASE_UNKNOWN, "UNKNOWN"}};
658
659 /*
660 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
661 *
662 * Purpose : print the current SCSI phase for debugging purposes
663 *
664 * Input : instance - which NCR5380
665 */
666
667 static void NCR5380_print_phase(struct Scsi_Host *instance)
/* */
668 {
669 unsigned char status;
670 int i;
671
672 status = NCR5380_read(STATUS_REG);
673 if (!(status & SR_REQ))
674 printk("scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
675 else {
676 for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
677 (phases[i].value != (status & PHASE_MASK)); ++i);
678 printk("scsi%d: phase %s\n", HOSTNO, phases[i].name);
679 }
680 }
681 #endif
682
683 /*
684 * We need to have our coroutine active given these constraints :
685 * 1. The mutex flag, main_running, can only be set when the main
686 * routine can actually process data, otherwise SCSI commands
687 * will never get issued.
688 *
689 * 2. NCR5380_main() shouldn't be called before it has exited, because
690 * other drivers have had kernel stack overflows in similar
691 * situations.
692 *
693 * 3. We don't want to inline NCR5380_main() because of space concerns,
694 * even though it is only called in two places.
695 *
696 * So, the solution is to set the mutex in an inline wrapper for the
697 * main coroutine, and have the main coroutine exit with interrupts
698 * disabled after the final search through the queues so that no race
699 * conditions are possible.
700 */
701
702 static volatile int main_running = 0;
703
704 /*
705 * Function : run_main(void)
706 *
707 * Purpose : insure that the coroutine is running and will process our
708 * request. main_running is checked/set here (in an inline function)
709 * rather than in NCR5380_main itself to reduce the chances of stack
710 * overflow.
711 *
712 */
713
714 static void NCR5380_main_a ( unsigned long flags );
715
716 static __inline__ void run_main(void)
/* */
717 {
718 unsigned long flags;
719
720 save_flags(flags);
721 cli();
722 if (!main_running) {
723 main_running = 1;
724 NCR5380_main_a( flags );
725 /*
726 * main_running is cleared in NCR5380_main once it can't do
727 * more work, and NCR5380_main exits with interrupts disabled.
728 */
729 }
730 restore_flags(flags);
731 }
732
733
734 static void NCR5380_all_init (void)
/* */
735 {
736 static int done = 0;
737 if (!done) {
738 #if (NDEBUG & NDEBUG_INIT)
739 printk("scsi : NCR5380_all_init()\n");
740 #endif
741 done = 1;
742 }
743 }
744
745
746 /*
747 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
748 *
749 * Purpose : called by probe code indicating the NCR5380 driver
750 * options that were selected.
751 *
752 * Inputs : instance, pointer to this instance. Unused.
753 */
754
755 static void NCR5380_print_options (struct Scsi_Host *instance)
/* */
756 {
757 printk(" generic options"
758 #ifdef AUTOSENSE
759 " AUTOSENSE"
760 #endif
761 #ifdef REAL_DMA
762 " REAL DMA"
763 #endif
764 #ifdef PARITY
765 " PARITY"
766 #endif
767 #ifdef SUPPORT_TAGS
768 " SCSI-2 TAGGED QUEUING"
769 #endif
770 );
771 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
772 }
773
774 /*
775 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
776 *
777 * Purpose : print commands in the various queues, called from
778 * NCR5380_abort and NCR5380_debug to aid debugging.
779 *
780 * Inputs : instance, pointer to this instance.
781 */
782
783 static void NCR5380_print_status (struct Scsi_Host *instance)
/* */
784 {
785 char pr_bfr[256];
786 char *start;
787 int len;
788
789 printk("NCR5380: coroutine is%s running.\n",
790 main_running ? "" : "n't");
791
792 #ifdef NDEBUG
793 NCR5380_print (instance);
794 NCR5380_print_phase (instance);
795 #endif
796
797 len = NCR5380_proc_info(pr_bfr, &start, 0, sizeof(pr_bfr), HOSTNO, 0);
798 pr_bfr[len] = 0;
799 printk("\n%s\n", pr_bfr);
800 }
801
802
803 /******************************************/
804 /*
805 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
806 *
807 * *buffer: I/O buffer
808 * **start: if inout == FALSE pointer into buffer where user read should start
809 * offset: current offset
810 * length: length of buffer
811 * hostno: Scsi_Host host_no
812 * inout: TRUE - user is writing; FALSE - user is reading
813 *
814 * Return the number of bytes read from or written
815 */
816
817 #undef SPRINTF
818 #define SPRINTF(args...) do { if(pos < buffer + length) pos += sprintf(pos, ## args); } while(0)
819 static
820 char *lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length);
821 static
822 char *lprint_command (unsigned char *cmd, char *pos, char *buffer, int len);
823 static
824 char *lprint_opcode(int opcode, char *pos, char *buffer, int length);
825
826 #ifndef NCR5380_proc_info
827 static
828 #endif
829 int NCR5380_proc_info (char *buffer, char **start, off_t offset,
/* */
830 int length, int hostno, int inout)
831 {
832 char *pos = buffer;
833 struct Scsi_Host *instance;
834 struct NCR5380_hostdata *hostdata;
835 Scsi_Cmnd *ptr;
836 unsigned long flags;
837
838 for (instance = first_instance; instance && HOSTNO != hostno;
839 instance = instance->next)
840 ;
841 if (!instance)
842 return(-ESRCH);
843 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
844
845 if (inout) { /* Has data been written to the file ? */
846 return(-ENOSYS); /* Currently this is a no-op */
847 }
848 SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
849 save_flags(flags);
850 cli();
851 SPRINTF("NCR5380: coroutine is%s running.\n", main_running ? "" : "n't");
852 if (!hostdata->connected)
853 SPRINTF("scsi%d: no currently connected command\n", HOSTNO);
854 else
855 pos = lprint_Scsi_Cmnd ((Scsi_Cmnd *) hostdata->connected,
856 pos, buffer, length);
857 SPRINTF("scsi%d: issue_queue\n", HOSTNO);
858 for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = NEXT(ptr))
859 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
860
861 SPRINTF("scsi%d: disconnected_queue\n", HOSTNO);
862 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
863 ptr = NEXT(ptr))
864 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
865
866 restore_flags(flags);
867 *start = buffer;
868 if (pos - buffer < offset)
869 return 0;
870 else if (pos - buffer - offset < length)
871 return pos - buffer - offset;
872 return length;
873 }
874
875 static char *
876 lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length)
/* */
877 {
878 SPRINTF("scsi%d: destination target %d, lun %d\n",
879 H_NO(cmd), cmd->target, cmd->lun);
880 SPRINTF(" command = ");
881 pos = lprint_command (cmd->cmnd, pos, buffer, length);
882 return (pos);
883 }
884
885 static char *
886 lprint_command (unsigned char *command, char *pos, char *buffer, int length)
/* */
887 {
888 int i, s;
889 pos = lprint_opcode(command[0], pos, buffer, length);
890 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
891 SPRINTF("%02x ", command[i]);
892 SPRINTF("\n");
893 return(pos);
894 }
895
896 static
897 char *lprint_opcode(int opcode, char *pos, char *buffer, int length)
/* */
898 {
899 SPRINTF("%2d (0x%02x)", opcode, opcode);
900 return(pos);
901 }
902
903
904 /*
905 * Function : void NCR5380_init (struct Scsi_Host *instance)
906 *
907 * Purpose : initializes *instance and corresponding 5380 chip.
908 *
909 * Inputs : instance - instantiation of the 5380 driver.
910 *
911 * Notes : I assume that the host, hostno, and id bits have been
912 * set correctly. I don't care about the irq and other fields.
913 *
914 */
915
916 static void NCR5380_init (struct Scsi_Host *instance, int flags)
/* */
917 {
918 int i;
919 SETUP_HOSTDATA(instance);
920
921 NCR5380_all_init();
922
923 hostdata->aborted = 0;
924 hostdata->id_mask = 1 << instance->this_id;
925 hostdata->id_higher_mask = 0;
926 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
927 if (i > hostdata->id_mask)
928 hostdata->id_higher_mask |= i;
929 for (i = 0; i < 8; ++i)
930 hostdata->busy[i] = 0;
931 #ifdef SUPPORT_TAGS
932 init_tags();
933 #endif
934 #if defined (REAL_DMA)
935 hostdata->dma_len = 0;
936 #endif
937 hostdata->targets_present = 0;
938 hostdata->connected = NULL;
939 hostdata->issue_queue = NULL;
940 hostdata->disconnected_queue = NULL;
941 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
942
943 if (!the_template) {
944 the_template = instance->hostt;
945 first_instance = instance;
946 }
947
948
949 #ifndef AUTOSENSE
950 if ((instance->cmd_per_lun > 1) || instance->can_queue > 1))
951 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
952 " without AUTOSENSE option, contingent allegiance conditions may\n"
953 " be incorrectly cleared.\n", HOSTNO);
954 #endif /* def AUTOSENSE */
955
956 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
957 NCR5380_write(MODE_REG, MR_BASE);
958 NCR5380_write(TARGET_COMMAND_REG, 0);
959 NCR5380_write(SELECT_ENABLE_REG, 0);
960 }
961
962 /*
963 * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd,
964 * void (*done)(Scsi_Cmnd *))
965 *
966 * Purpose : enqueues a SCSI command
967 *
968 * Inputs : cmd - SCSI command, done - function called on completion, with
969 * a pointer to the command descriptor.
970 *
971 * Returns : 0
972 *
973 * Side effects :
974 * cmd is added to the per instance issue_queue, with minor
975 * twiddling done to the host specific fields of cmd. If the
976 * main coroutine is not running, it is restarted.
977 *
978 */
979
980 /* Only make static if a wrapper function is used */
981 #ifndef NCR5380_queue_command
982 static
983 #endif
984 int NCR5380_queue_command (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
/* */
985 {
986 SETUP_HOSTDATA(cmd->host);
987 Scsi_Cmnd *tmp;
988 int oldto;
989 unsigned long flags;
990 extern int scsi_update_timeout(Scsi_Cmnd * SCset, int timeout);
991
992 #if (NDEBUG & NDEBUG_NO_WRITE)
993 switch (cmd->cmnd[0]) {
994 case WRITE_6:
995 case WRITE_10:
996 printk("scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
997 H_NO(cmd));
998 cmd->result = (DID_ERROR << 16);
999 done(cmd);
1000 return 0;
1001 }
1002 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
1003
1004
1005 #ifdef NCR5380_STATS
1006 # if 0
1007 if (!hostdata->connected && !hostdata->issue_queue &&
1008 !hostdata->disconnected_queue) {
1009 hostdata->timebase = jiffies;
1010 }
1011 # endif
1012 # ifdef NCR5380_STAT_LIMIT
1013 if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
1014 # endif
1015 switch (cmd->cmnd[0])
1016 {
1017 case WRITE:
1018 case WRITE_6:
1019 case WRITE_10:
1020 hostdata->time_write[cmd->target] -= (jiffies - hostdata->timebase);
1021 hostdata->bytes_write[cmd->target] += cmd->request_bufflen;
1022 hostdata->pendingw++;
1023 break;
1024 case READ:
1025 case READ_6:
1026 case READ_10:
1027 hostdata->time_read[cmd->target] -= (jiffies - hostdata->timebase);
1028 hostdata->bytes_read[cmd->target] += cmd->request_bufflen;
1029 hostdata->pendingr++;
1030 break;
1031 }
1032 #endif
1033
1034 /*
1035 * We use the host_scribble field as a pointer to the next command
1036 * in a queue
1037 */
1038
1039 NEXT(cmd) = NULL;
1040 cmd->scsi_done = done;
1041
1042 cmd->result = 0;
1043
1044
1045 /*
1046 * Insert the cmd into the issue queue. Note that REQUEST SENSE
1047 * commands are added to the head of the queue since any command will
1048 * clear the contingent allegiance condition that exists and the
1049 * sense data is only guaranteed to be valid while the condition exists.
1050 */
1051
1052 save_flags(flags);
1053 cli();
1054 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
1055 * Otherwise a running NCR5380_main may steal the lock.
1056 * Lock before actually inserting due to fairness reasons explained in
1057 * atari_scsi.c. If we insert first, then it's impossible for this driver
1058 * to release the lock.
1059 * Stop timer for this command while waiting for the lock, or timeouts
1060 * may happen (and they really do), and it's no good if the command doesn't
1061 * appear in any of the queues.
1062 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1063 * because also a timer int can trigger an abort or reset, which would
1064 * alter queues and touch the lock.
1065 */
1066 if (!IS_A_TT()) {
1067 oldto = scsi_update_timeout(cmd, 0);
1068 falcon_get_lock();
1069 scsi_update_timeout(cmd, oldto);
1070 }
1071 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
1072 LIST(cmd, hostdata->issue_queue);
1073 NEXT(cmd) = hostdata->issue_queue;
1074 hostdata->issue_queue = cmd;
1075 } else {
1076 for (tmp = (Scsi_Cmnd *)hostdata->issue_queue;
1077 NEXT(tmp); tmp = NEXT(tmp))
1078 ;
1079 LIST(cmd, tmp);
1080 NEXT(tmp) = cmd;
1081 }
1082 restore_flags(flags);
1083
1084 #if (NDEBUG & NDEBUG_QUEUES)
1085 printk("scsi%d: command added to %s of queue\n", H_NO(cmd),
1086 (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
1087 #endif
1088
1089 /* Run the coroutine if it isn't already running. */
1090 run_main();
1091 return 0;
1092 }
1093
1094 /*
1095 * Function : NCR5380_main (void)
1096 *
1097 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1098 * be done on the NCR5380 host adapters in a system. Both
1099 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1100 * in case it is not running.
1101 *
1102 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
1103 * reenable them. This prevents reentrancy and kernel stack overflow.
1104 */
1105
1106 static inline void NCR5380_main () {}
/* */
1107
1108 static void NCR5380_main_a ( unsigned long flags )
/* */
1109 {
1110 Scsi_Cmnd *tmp, *prev;
1111 struct Scsi_Host *instance = first_instance;
1112 struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
1113 int done;
1114
1115 /*
1116 * We run (with interrupts disabled) until we're sure that none of
1117 * the host adapters have anything that can be done, at which point
1118 * we set main_running to 0 and exit.
1119 *
1120 * Interrupts are enabled before doing various other internal
1121 * instructions, after we've decided that we need to run through
1122 * the loop again.
1123 *
1124 * this should prevent any race conditions.
1125 *
1126 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1127 * because also a timer int can trigger an abort or reset, which can
1128 * alter queues and touch the Falcon lock.
1129 */
1130
1131 do {
1132 cli(); /* Freeze request queues */
1133 done = 1;
1134
1135 if (!hostdata->connected) {
1136 #if (NDEBUG & NDEBUG_MAIN)
1137 printk("scsi%d: not connected\n", HOSTNO);
1138 #endif
1139 /*
1140 * Search through the issue_queue for a command destined
1141 * for a target that's not busy.
1142 */
1143 #if (NDEBUG & NDEBUG_LISTS)
1144 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL;
1145 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1146 ;
1147 /*printk("%p ", tmp);*/
1148 if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/
1149 #endif
1150 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue,
1151 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) {
1152
1153 #if (NDEBUG & NDEBUG_LISTS)
1154 if (prev != tmp)
1155 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
1156 tmp, tmp->target, hostdata->busy[tmp->target],
1157 tmp->lun);
1158 #endif
1159 /* When we find one, remove it from the issue queue. */
1160 /* ++guenther: possible race with Falcon locking */
1161 if (
1162 #ifdef SUPPORT_TAGS
1163 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
1164 #else
1165 !(hostdata->busy[tmp->target] & (1 << tmp->lun))
1166 #endif
1167 ) {
1168 cli(); /* ++guenther: just to be sure, this must be atomic */
1169 if (prev) {
1170 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
1171 NEXT(prev) = NEXT(tmp);
1172 } else {
1173 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1174 hostdata->issue_queue = NEXT(tmp);
1175 }
1176 NEXT(tmp) = NULL;
1177 falcon_dont_release++;
1178
1179 /* reenable interrupts after finding one */
1180 restore_flags(flags);
1181
1182 /*
1183 * Attempt to establish an I_T_L nexus here.
1184 * On success, instance->hostdata->connected is set.
1185 * On failure, we must add the command back to the
1186 * issue queue so we can keep trying.
1187 */
1188 #if (NDEBUG & (NDEBUG_MAIN | NDEBUG_QUEUES))
1189 printk("scsi%d: main(): command for target %d lun %d "
1190 "removed from issue_queue\n",
1191 HOSTNO, tmp->target, tmp->lun);
1192 #endif
1193 /*
1194 * REQUEST SENSE commands are issued without tagged
1195 * queueing, even on SCSI-II devices because the
1196 * contingent allegiance condition exists for the
1197 * entire unit.
1198 */
1199 /* ++roman: ...and the standard also requires that
1200 * REQUEST SENSE command are untagged.
1201 */
1202
1203 #ifdef SUPPORT_TAGS
1204 cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE );
1205 #endif
1206 if (!NCR5380_select(instance, tmp,
1207 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
1208 TAG_NEXT)) {
1209 falcon_dont_release--;
1210 /* release if target did not response! */
1211 falcon_release_lock_if_possible( hostdata );
1212 break;
1213 } else {
1214 cli();
1215 LIST(tmp, hostdata->issue_queue);
1216 NEXT(tmp) = hostdata->issue_queue;
1217 hostdata->issue_queue = tmp;
1218 #ifdef SUPPORT_TAGS
1219 cmd_free_tag( tmp );
1220 #endif
1221 falcon_dont_release--;
1222 restore_flags(flags);
1223 #if (NDEBUG & (NDEBUG_MAIN | NDEBUG_QUEUES))
1224 printk("scsi%d: main(): select() failed, "
1225 "returned to issue_queue\n", HOSTNO);
1226 #endif
1227 if (hostdata->connected)
1228 break;
1229 }
1230 } /* if target/lun/target queue is not busy */
1231 } /* for issue_queue */
1232 } /* if (!hostdata->connected) */
1233
1234 if (hostdata->connected
1235 #ifdef REAL_DMA
1236 && !hostdata->dma_len
1237 #endif
1238 ) {
1239 restore_flags(flags);
1240 #if (NDEBUG & NDEBUG_MAIN)
1241 printk("scsi%d: main() : performing information transfer\n",
1242 HOSTNO);
1243 #endif
1244 NCR5380_information_transfer(instance);
1245 #if (NDEBUG & NDEBUG_MAIN)
1246 printk("scsi%d: main() : done set false\n", HOSTNO);
1247 #endif
1248 done = 0;
1249 } else {
1250 cli(); /* ++guenther: be sure to protect main_running */
1251 break;
1252 }
1253 } while (!done);
1254 main_running = 0;
1255 }
1256
1257
1258 #ifdef REAL_DMA
1259 /*
1260 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1261 *
1262 * Purpose : Called by interrupt handler when DMA finishes or a phase
1263 * mismatch occurs (which would finish the DMA transfer).
1264 *
1265 * Inputs : instance - this instance of the NCR5380.
1266 *
1267 */
1268
1269 static void NCR5380_dma_complete( struct Scsi_Host *instance )
/* */
1270 {
1271 SETUP_HOSTDATA(instance);
1272 int transfered, saved_data = 0, overrun = 0, cnt, toPIO;
1273 unsigned char **data, p;
1274 volatile int *count;
1275
1276 if (!hostdata->connected) {
1277 printk("scsi%d: received end of DMA interrupt with no connected cmd\n",
1278 HOSTNO);
1279 return;
1280 }
1281
1282 if (atari_read_overruns) {
1283 p = hostdata->connected->SCp.phase;
1284 if (p & SR_IO) {
1285 udelay(10);
1286 if ((((NCR5380_read(BUS_AND_STATUS_REG)) &
1287 (BASR_PHASE_MATCH|BASR_ACK)) ==
1288 (BASR_PHASE_MATCH|BASR_ACK))) {
1289 saved_data = NCR5380_read(INPUT_DATA_REG);
1290 overrun = 1;
1291 #if (NDEBUG & NDEBUG_DMA)
1292 printk( "scsi%d: read overrun handled\n", HOSTNO );
1293 #endif
1294 }
1295 }
1296 }
1297
1298 #if (NDEBUG & NDEBUG_DMA)
1299 printk("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1300 HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
1301 NCR5380_read(STATUS_REG));
1302 #endif
1303
1304 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1305 NCR5380_write(MODE_REG, MR_BASE);
1306 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1307
1308 transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
1309 hostdata->dma_len = 0;
1310
1311 data = (unsigned char **) &(hostdata->connected->SCp.ptr);
1312 count = &(hostdata->connected->SCp.this_residual);
1313 *data += transfered;
1314 *count -= transfered;
1315
1316 if (atari_read_overruns) {
1317 if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) {
1318 cnt = toPIO = atari_read_overruns;
1319 if (overrun) {
1320 #if (NDEBUG & NDEBUG_DMA)
1321 printk("Got an input overrun, using saved byte\n");
1322 #endif
1323 *(*data)++ = saved_data;
1324 (*count)--;
1325 cnt--;
1326 toPIO--;
1327 }
1328 #if (NDEBUG & NDEBUG_DMA)
1329 printk( "Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data );
1330 #endif
1331
1332 NCR5380_transfer_pio(instance, &p, &cnt, data);
1333 *count -= toPIO - cnt;
1334 }
1335 }
1336 }
1337 #endif /* REAL_DMA */
1338
1339
1340 /*
1341 * Function : void NCR5380_intr (int irq)
1342 *
1343 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1344 * from the disconnected queue, and restarting NCR5380_main()
1345 * as required.
1346 *
1347 * Inputs : int irq, irq that caused this interrupt.
1348 *
1349 */
1350
1351 static void NCR5380_intr (int irq, void *dev_id, struct pt_regs *regs)
/* */
1352 {
1353 struct Scsi_Host *instance = first_instance;
1354 int done = 1;
1355 unsigned char basr;
1356
1357 #if (NDEBUG & NDEBUG_INTR)
1358 printk("scsi%d: NCR5380 irq triggered\n", HOSTNO);
1359 #endif
1360
1361 /* Look for pending interrupts */
1362 basr = NCR5380_read(BUS_AND_STATUS_REG);
1363 #if (NDEBUG & NDEBUG_INTR)
1364 printk( "scsi%d: BASR=%02x\n", HOSTNO, basr );
1365 #endif
1366 /* dispatch to appropriate routine if found and done=0 */
1367 if (basr & BASR_IRQ) {
1368 #if (NDEBUG & NDEBUG_INTR)
1369 NCR5380_print(instance);
1370 #endif
1371 if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
1372 done = 0;
1373 ENABLE_IRQ();
1374 #if (NDEBUG & NDEBUG_INTR)
1375 printk("scsi%d: SEL interrupt\n", HOSTNO);
1376 #endif
1377 NCR5380_reselect(instance);
1378 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1379 }
1380 else if (basr & BASR_PARITY_ERROR) {
1381 #if (NDEBUG & NDEBUG_INTR)
1382 printk("scsi%d: PARITY interrupt\n", HOSTNO);
1383 #endif
1384 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1385 }
1386 else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1387 #if (NDEBUG & NDEBUG_INTR)
1388 printk("scsi%d: RESET interrupt\n", HOSTNO);
1389 #endif
1390 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1391 }
1392 else {
1393 /*
1394 * The rest of the interrupt conditions can occur only during a
1395 * DMA transfer
1396 */
1397
1398 #if defined(REAL_DMA)
1399 /*
1400 * We should only get PHASE MISMATCH and EOP interrupts if we have
1401 * DMA enabled, so do a sanity check based on the current setting
1402 * of the MODE register.
1403 */
1404
1405 if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
1406 ((basr & BASR_END_DMA_TRANSFER) ||
1407 !(basr & BASR_PHASE_MATCH))) {
1408
1409 #if (NDEBUG & NDEBUG_INTR)
1410 printk("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
1411 #endif
1412 NCR5380_dma_complete( instance );
1413 done = 0;
1414 ENABLE_IRQ();
1415 } else
1416 #endif /* REAL_DMA */
1417 {
1418 #if 1 || (NDEBUG & NDEBUG_INTR)
1419 /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1420 if (basr & BASR_PHASE_MATCH)
1421 printk("scsi%d: unknown interrupt, "
1422 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1423 HOSTNO, basr, NCR5380_read(MODE_REG),
1424 NCR5380_read(STATUS_REG));
1425 #endif
1426 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1427 }
1428 } /* if !(SELECTION || PARITY) */
1429 } /* BASR & IRQ */
1430 else {
1431 #if 1 || (NDEBUG & NDEBUG_INTR)
1432 printk("scsi%d: interrupt without IRQ bit set in BASR, "
1433 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
1434 NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
1435 #endif
1436 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1437 }
1438
1439 if (!done) {
1440 #if (NDEBUG & NDEBUG_INTR)
1441 printk("scsi%d: in int routine, calling main\n", HOSTNO );
1442 #endif
1443 run_main();
1444 }
1445 }
1446
1447 #ifdef NCR5380_STATS
1448 static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd* cmd)
/* */
1449 {
1450 # ifdef NCR5380_STAT_LIMIT
1451 if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
1452 # endif
1453 switch (cmd->cmnd[0])
1454 {
1455 case WRITE:
1456 case WRITE_6:
1457 case WRITE_10:
1458 hostdata->time_write[cmd->target] += (jiffies - hostdata->timebase);
1459 /*hostdata->bytes_write[cmd->target] += cmd->request_bufflen;*/
1460 hostdata->pendingw--;
1461 break;
1462 case READ:
1463 case READ_6:
1464 case READ_10:
1465 hostdata->time_read[cmd->target] += (jiffies - hostdata->timebase);
1466 /*hostdata->bytes_read[cmd->target] += cmd->request_bufflen;*/
1467 hostdata->pendingr--;
1468 break;
1469 }
1470 }
1471 #endif
1472
1473 /*
1474 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
1475 * int tag);
1476 *
1477 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1478 * including ARBITRATION, SELECTION, and initial message out for
1479 * IDENTIFY and queue messages.
1480 *
1481 * Inputs : instance - instantiation of the 5380 driver on which this
1482 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1483 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1484 * the command that is presently connected.
1485 *
1486 * Returns : -1 if selection could not execute for some reason,
1487 * 0 if selection succeeded or failed because the target
1488 * did not respond.
1489 *
1490 * Side effects :
1491 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1492 * with registers as they should have been on entry - ie
1493 * SELECT_ENABLE will be set appropriately, the NCR5380
1494 * will cease to drive any SCSI bus signals.
1495 *
1496 * If successful : I_T_L or I_T_L_Q nexus will be established,
1497 * instance->connected will be set to cmd.
1498 * SELECT interrupt will be disabled.
1499 *
1500 * If failed (no target) : cmd->scsi_done() will be called, and the
1501 * cmd->result host byte set to DID_BAD_TARGET.
1502 */
1503
1504 static int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, int tag)
/* */
1505 {
1506 SETUP_HOSTDATA(instance);
1507 unsigned char tmp[3], phase;
1508 unsigned char *data;
1509 int len;
1510 unsigned long timeout;
1511 unsigned long flags;
1512
1513 hostdata->restart_select = 0;
1514 #if defined (NDEBUG) && (NDEBUG & NDEBUG_ARBITRATION)
1515 NCR5380_print(instance);
1516 printk("scsi%d: starting arbitration, id = %d\n", HOSTNO,
1517 instance->this_id);
1518 #endif
1519
1520 /*
1521 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1522 * data bus during SELECTION.
1523 */
1524
1525 save_flags(flags);
1526 cli();
1527 if (hostdata->connected) {
1528 restore_flags(flags);
1529 return -1;
1530 }
1531 NCR5380_write(TARGET_COMMAND_REG, 0);
1532
1533
1534 /*
1535 * Start arbitration.
1536 */
1537
1538 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1539 NCR5380_write(MODE_REG, MR_ARBITRATE);
1540
1541 restore_flags(flags);
1542
1543 /* Wait for arbitration logic to complete */
1544 #if NCR_TIMEOUT
1545 {
1546 unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
1547
1548 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1549 && jiffies < timeout && !hostdata->connected)
1550 ;
1551 if (jiffies >= timeout)
1552 {
1553 printk("scsi : arbitration timeout at %d\n", __LINE__);
1554 NCR5380_write(MODE_REG, MR_BASE);
1555 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1556 return -1;
1557 }
1558 }
1559 #else /* NCR_TIMEOUT */
1560 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1561 && !hostdata->connected);
1562 #endif
1563
1564 #if (NDEBUG & NDEBUG_ARBITRATION)
1565 printk("scsi%d: arbitration complete\n", HOSTNO);
1566 /* Avoid GCC 2.4.5 asm needs to many reloads error */
1567 __asm__("nop");
1568 #endif
1569
1570 if (hostdata->connected) {
1571 NCR5380_write(MODE_REG, MR_BASE);
1572 return -1;
1573 }
1574 /*
1575 * The arbitration delay is 2.2us, but this is a minimum and there is
1576 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1577 * the integral nature of udelay().
1578 *
1579 */
1580
1581 udelay(3);
1582
1583 /* Check for lost arbitration */
1584 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1585 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1586 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1587 hostdata->connected) {
1588 NCR5380_write(MODE_REG, MR_BASE);
1589 #if (NDEBUG & NDEBUG_ARBITRATION)
1590 printk("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n", HOSTNO);
1591 #endif
1592 return -1;
1593 }
1594
1595 /* after/during arbitration, BSY should be asserted.
1596 IBM DPES-31080 Version S31Q works now */
1597 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1598 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL |
1599 ICR_ASSERT_BSY ) ;
1600
1601 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1602 hostdata->connected) {
1603 NCR5380_write(MODE_REG, MR_BASE);
1604 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1605 #if (NDEBUG & NDEBUG_ARBITRATION)
1606 printk("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n", HOSTNO);
1607 #endif
1608 return -1;
1609 }
1610
1611 /*
1612 * Again, bus clear + bus settle time is 1.2us, however, this is
1613 * a minimum so we'll udelay ceil(1.2)
1614 */
1615
1616 #ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1617 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1618 udelay(15);
1619 #else
1620 udelay(2);
1621 #endif
1622
1623 if (hostdata->connected) {
1624 NCR5380_write(MODE_REG, MR_BASE);
1625 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1626 return -1;
1627 }
1628
1629 #if (NDEBUG & NDEBUG_ARBITRATION)
1630 printk("scsi%d: won arbitration\n", HOSTNO);
1631 #endif
1632
1633
1634 /*
1635 * Now that we have won arbitration, start Selection process, asserting
1636 * the host and target ID's on the SCSI bus.
1637 */
1638
1639 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->target)));
1640
1641 /*
1642 * Raise ATN while SEL is true before BSY goes false from arbitration,
1643 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1644 * phase immediately after selection.
1645 */
1646
1647 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
1648 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
1649 NCR5380_write(MODE_REG, MR_BASE);
1650
1651 /*
1652 * Reselect interrupts must be turned off prior to the dropping of BSY,
1653 * otherwise we will trigger an interrupt.
1654 */
1655
1656 if (hostdata->connected) {
1657 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1658 return -1;
1659 }
1660
1661 NCR5380_write(SELECT_ENABLE_REG, 0);
1662
1663 /*
1664 * The initiator shall then wait at least two deskew delays and release
1665 * the BSY signal.
1666 */
1667 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1668
1669 /* Reset BSY */
1670 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
1671 ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1672
1673 /*
1674 * Something weird happens when we cease to drive BSY - looks
1675 * like the board/chip is letting us do another read before the
1676 * appropriate propagation delay has expired, and we're confusing
1677 * a BSY signal from ourselves as the target's response to SELECTION.
1678 *
1679 * A small delay (the 'C++' frontend breaks the pipeline with an
1680 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1681 * tighter 'C' code breaks and requires this) solves the problem -
1682 * the 1 us delay is arbitrary, and only used because this delay will
1683 * be the same on other platforms and since it works here, it should
1684 * work there.
1685 *
1686 * wingel suggests that this could be due to failing to wait
1687 * one deskew delay.
1688 */
1689
1690 udelay(1);
1691
1692 #if (NDEBUG & NDEBUG_SELECTION)
1693 printk("scsi%d: selecting target %d\n", HOSTNO, cmd->target);
1694 #endif
1695
1696 /*
1697 * The SCSI specification calls for a 250 ms timeout for the actual
1698 * selection.
1699 */
1700
1701 timeout = jiffies + 25;
1702
1703 /*
1704 * XXX very interesting - we're seeing a bounce where the BSY we
1705 * asserted is being reflected / still asserted (propagation delay?)
1706 * and it's detecting as true. Sigh.
1707 */
1708
1709 #if 0
1710 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1711 * IO while SEL is true. But again, there are some disks out the in the
1712 * world that do that nevertheless. (Somebody claimed that this announces
1713 * reselection capability of the target.) So we better skip that test and
1714 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
1715 */
1716
1717 while ((jiffies < timeout) && !(NCR5380_read(STATUS_REG) &
1718 (SR_BSY | SR_IO)));
1719
1720 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) ==
1721 (SR_SEL | SR_IO)) {
1722 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1723 NCR5380_reselect(instance);
1724 printk ("scsi%d: reselection after won arbitration?\n", HOSTNO);
1725 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1726 return -1;
1727 }
1728 #else
1729 while ((jiffies < timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY));
1730 #endif
1731
1732 /*
1733 * No less than two deskew delays after the initiator detects the
1734 * BSY signal is true, it shall release the SEL signal and may
1735 * change the DATA BUS. -wingel
1736 */
1737
1738 udelay(1);
1739
1740 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1741
1742 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1743 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1744 if (hostdata->targets_present & (1 << cmd->target)) {
1745 printk("scsi%d: weirdness\n", HOSTNO);
1746 if (hostdata->restart_select)
1747 printk("\trestart select\n");
1748 #ifdef NDEBUG
1749 NCR5380_print (instance);
1750 #endif
1751 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1752 return -1;
1753 }
1754 cmd->result = DID_BAD_TARGET << 16;
1755 #ifdef NCR5380_STATS
1756 collect_stats(hostdata, cmd);
1757 #endif
1758 #ifdef SUPPORT_TAGS
1759 cmd_free_tag( cmd );
1760 #endif
1761 cmd->scsi_done(cmd);
1762 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1763 #if (NDEBUG & NDEBUG_SELECTION)
1764 printk("scsi%d: target did not respond within 250ms\n", HOSTNO);
1765 #endif
1766 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1767 return 0;
1768 }
1769
1770 hostdata->targets_present |= (1 << cmd->target);
1771
1772 /*
1773 * Since we followed the SCSI spec, and raised ATN while SEL
1774 * was true but before BSY was false during selection, the information
1775 * transfer phase should be a MESSAGE OUT phase so that we can send the
1776 * IDENTIFY message.
1777 *
1778 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1779 * message (2 bytes) with a tag ID that we increment with every command
1780 * until it wraps back to 0.
1781 *
1782 * XXX - it turns out that there are some broken SCSI-II devices,
1783 * which claim to support tagged queuing but fail when more than
1784 * some number of commands are issued at once.
1785 */
1786
1787 /* Wait for start of REQ/ACK handshake */
1788 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
1789
1790 #if (NDEBUG & NDEBUG_SELECTION)
1791 printk("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1792 HOSTNO, cmd->target);
1793 #endif
1794 tmp[0] = IDENTIFY(1, cmd->lun);
1795
1796 #ifdef SUPPORT_TAGS
1797 if (cmd->tag != TAG_NONE) {
1798 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1799 tmp[2] = cmd->tag;
1800 len = 3;
1801 } else
1802 len = 1;
1803 #else
1804 len = 1;
1805 cmd->tag=0;
1806 #endif /* SUPPORT_TAGS */
1807
1808 /* Send message(s) */
1809 data = tmp;
1810 phase = PHASE_MSGOUT;
1811 NCR5380_transfer_pio(instance, &phase, &len, &data);
1812 #if (NDEBUG & NDEBUG_SELECTION)
1813 printk("scsi%d: nexus established.\n", HOSTNO);
1814 #endif
1815 /* XXX need to handle errors here */
1816 hostdata->connected = cmd;
1817 #ifndef SUPPORT_TAGS
1818 hostdata->busy[cmd->target] |= (1 << cmd->lun);
1819 #endif
1820
1821 initialize_SCp(cmd);
1822
1823
1824 return 0;
1825 }
1826
1827 /*
1828 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1829 * unsigned char *phase, int *count, unsigned char **data)
1830 *
1831 * Purpose : transfers data in given phase using polled I/O
1832 *
1833 * Inputs : instance - instance of driver, *phase - pointer to
1834 * what phase is expected, *count - pointer to number of
1835 * bytes to transfer, **data - pointer to data pointer.
1836 *
1837 * Returns : -1 when different phase is entered without transferring
1838 * maximum number of bytes, 0 if all bytes are transfered or exit
1839 * is in same phase.
1840 *
1841 * Also, *phase, *count, *data are modified in place.
1842 *
1843 * XXX Note : handling for bus free may be useful.
1844 */
1845
1846 /*
1847 * Note : this code is not as quick as it could be, however it
1848 * IS 100% reliable, and for the actual data transfer where speed
1849 * counts, we will always do a pseudo DMA or DMA transfer.
1850 */
1851
1852 static int NCR5380_transfer_pio( struct Scsi_Host *instance,
/* */
1853 unsigned char *phase, int *count,
1854 unsigned char **data)
1855 {
1856 register unsigned char p = *phase, tmp;
1857 register int c = *count;
1858 register unsigned char *d = *data;
1859
1860 /*
1861 * The NCR5380 chip will only drive the SCSI bus when the
1862 * phase specified in the appropriate bits of the TARGET COMMAND
1863 * REGISTER match the STATUS REGISTER
1864 */
1865
1866 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1867
1868 do {
1869 /*
1870 * Wait for assertion of REQ, after which the phase bits will be
1871 * valid
1872 */
1873 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
1874
1875 #if (NDEBUG & NDEBUG_HANDSHAKE)
1876 printk("scsi%d: REQ detected\n", HOSTNO);
1877 #endif
1878
1879 /* Check for phase mismatch */
1880 if ((tmp & PHASE_MASK) != p) {
1881 #if (NDEBUG & NDEBUG_PIO)
1882 printk("scsi%d: phase mismatch\n", HOSTNO);
1883 NCR5380_print_phase(instance);
1884 #endif
1885 break;
1886 }
1887
1888 /* Do actual transfer from SCSI bus to / from memory */
1889 if (!(p & SR_IO))
1890 NCR5380_write(OUTPUT_DATA_REG, *d);
1891 else
1892 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1893
1894 ++d;
1895
1896 /*
1897 * The SCSI standard suggests that in MSGOUT phase, the initiator
1898 * should drop ATN on the last byte of the message phase
1899 * after REQ has been asserted for the handshake but before
1900 * the initiator raises ACK.
1901 */
1902
1903 if (!(p & SR_IO)) {
1904 if (!((p & SR_MSG) && c > 1)) {
1905 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1906 ICR_ASSERT_DATA);
1907 #if (NDEBUG & NDEBUG_PIO)
1908 NCR5380_print(instance);
1909 #endif
1910 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1911 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1912 } else {
1913 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1914 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1915 #if (NDEBUG & NDEBUG_PIO)
1916 NCR5380_print(instance);
1917 #endif
1918 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1919 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1920 }
1921 } else {
1922 #if (NDEBUG & NDEBUG_PIO)
1923 NCR5380_print(instance);
1924 #endif
1925 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1926 }
1927
1928 while (NCR5380_read(STATUS_REG) & SR_REQ);
1929
1930 #if (NDEBUG & NDEBUG_HANDSHAKE)
1931 printk("scsi%d: req false, handshake complete\n", HOSTNO);
1932 #endif
1933
1934 /*
1935 * We have several special cases to consider during REQ/ACK handshaking :
1936 * 1. We were in MSGOUT phase, and we are on the last byte of the
1937 * message. ATN must be dropped as ACK is dropped.
1938 *
1939 * 2. We are in a MSGIN phase, and we are on the last byte of the
1940 * message. We must exit with ACK asserted, so that the calling
1941 * code may raise ATN before dropping ACK to reject the message.
1942 *
1943 * 3. ACK and ATN are clear and the target may proceed as normal.
1944 */
1945 if (!(p == PHASE_MSGIN && c == 1)) {
1946 if (p == PHASE_MSGOUT && c > 1)
1947 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1948 else
1949 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1950 }
1951 } while (--c);
1952
1953 #if (NDEBUG & NDEBUG_PIO)
1954 printk("scsi%d: residual %d\n", HOSTNO, c);
1955 #endif
1956
1957 *count = c;
1958 *data = d;
1959 tmp = NCR5380_read(STATUS_REG);
1960 /* The phase read from the bus is valid if either REQ is (already)
1961 * asserted or if ACK hasn't been released yet. The latter is the case if
1962 * we're in MSGIN and all wanted bytes have been received. */
1963 if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
1964 *phase = tmp & PHASE_MASK;
1965 else
1966 *phase = PHASE_UNKNOWN;
1967
1968 if (!c || (*phase == p))
1969 return 0;
1970 else
1971 return -1;
1972 }
1973
1974 /*
1975 * Function : do_abort (Scsi_Host *host)
1976 *
1977 * Purpose : abort the currently established nexus. Should only be
1978 * called from a routine which can drop into a
1979 *
1980 * Returns : 0 on success, -1 on failure.
1981 */
1982
1983 static int do_abort (struct Scsi_Host *host)
/* */
1984 {
1985 unsigned char tmp, *msgptr, phase;
1986 int len;
1987
1988 /* Request message out phase */
1989 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1990
1991 /*
1992 * Wait for the target to indicate a valid phase by asserting
1993 * REQ. Once this happens, we'll have either a MSGOUT phase
1994 * and can immediately send the ABORT message, or we'll have some
1995 * other phase and will have to source/sink data.
1996 *
1997 * We really don't care what value was on the bus or what value
1998 * the target see's, so we just handshake.
1999 */
2000
2001 while (!(tmp = NCR5380_read(STATUS_REG)) & SR_REQ);
2002
2003 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2004
2005 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
2006 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
2007 ICR_ASSERT_ACK);
2008 while (NCR5380_read(STATUS_REG) & SR_REQ);
2009 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2010 }
2011
2012 tmp = ABORT;
2013 msgptr = &tmp;
2014 len = 1;
2015 phase = PHASE_MSGOUT;
2016 NCR5380_transfer_pio (host, &phase, &len, &msgptr);
2017
2018 /*
2019 * If we got here, and the command completed successfully,
2020 * we're about to go into bus free state.
2021 */
2022
2023 return len ? -1 : 0;
2024 }
2025
2026 #if defined(REAL_DMA)
2027 /*
2028 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
2029 * unsigned char *phase, int *count, unsigned char **data)
2030 *
2031 * Purpose : transfers data in given phase using either real
2032 * or pseudo DMA.
2033 *
2034 * Inputs : instance - instance of driver, *phase - pointer to
2035 * what phase is expected, *count - pointer to number of
2036 * bytes to transfer, **data - pointer to data pointer.
2037 *
2038 * Returns : -1 when different phase is entered without transferring
2039 * maximum number of bytes, 0 if all bytes or transfered or exit
2040 * is in same phase.
2041 *
2042 * Also, *phase, *count, *data are modified in place.
2043 *
2044 */
2045
2046
2047 static int NCR5380_transfer_dma( struct Scsi_Host *instance,
/* */
2048 unsigned char *phase, int *count,
2049 unsigned char **data)
2050 {
2051 SETUP_HOSTDATA(instance);
2052 register int c = *count;
2053 register unsigned char p = *phase;
2054 register unsigned char *d = *data;
2055 unsigned char tmp;
2056 unsigned long flags;
2057
2058 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
2059 *phase = tmp;
2060 return -1;
2061 }
2062
2063 if (atari_read_overruns && (p & SR_IO)) {
2064 c -= atari_read_overruns;
2065 }
2066
2067 #if (NDEBUG & NDEBUG_DMA)
2068 printk("scsi%d: initializing DMA channel %d for %s, %d bytes %s %0x\n",
2069 HOSTNO, instance->dma_channel, (p & SR_IO) ? "reading" :
2070 "writing", c, (p & SR_IO) ? "to" : "from", (unsigned) d);
2071 #endif
2072
2073 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
2074
2075 #ifdef REAL_DMA
2076 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
2077 #endif /* def REAL_DMA */
2078
2079 if (IS_A_TT()) {
2080 /* On the Medusa, it is a must to initialize the DMA before
2081 * starting the NCR. This is also the cleaner way for the TT.
2082 */
2083 save_flags(flags);
2084 cli();
2085 hostdata->dma_len = (p & SR_IO) ?
2086 NCR5380_dma_read_setup(instance, d, c) :
2087 NCR5380_dma_write_setup(instance, d, c);
2088 restore_flags(flags);
2089 }
2090
2091 if (p & SR_IO)
2092 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
2093 else {
2094 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
2095 NCR5380_write(START_DMA_SEND_REG, 0);
2096 }
2097
2098 if (!IS_A_TT()) {
2099 /* On the Falcon, the DMA setup must be done after the last */
2100 /* NCR access, else the DMA setup gets trashed!
2101 */
2102 save_flags(flags);
2103 cli();
2104 hostdata->dma_len = (p & SR_IO) ?
2105 NCR5380_dma_read_setup(instance, d, c) :
2106 NCR5380_dma_write_setup(instance, d, c);
2107 restore_flags(flags);
2108 }
2109 return 0;
2110 }
2111 #endif /* defined(REAL_DMA) */
2112
2113 /*
2114 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
2115 *
2116 * Purpose : run through the various SCSI phases and do as the target
2117 * directs us to. Operates on the currently connected command,
2118 * instance->connected.
2119 *
2120 * Inputs : instance, instance for which we are doing commands
2121 *
2122 * Side effects : SCSI things happen, the disconnected queue will be
2123 * modified if a command disconnects, *instance->connected will
2124 * change.
2125 *
2126 * XXX Note : we need to watch for bus free or a reset condition here
2127 * to recover from an unexpected bus free condition.
2128 */
2129
2130 static void NCR5380_information_transfer (struct Scsi_Host *instance)
/* */
2131 {
2132 SETUP_HOSTDATA(instance);
2133 unsigned long flags;
2134 unsigned char msgout = NOP;
2135 int sink = 0;
2136 int len;
2137 #if defined(REAL_DMA)
2138 int transfersize;
2139 #endif
2140 unsigned char *data;
2141 unsigned char phase, tmp, extended_msg[10], old_phase=0xff;
2142 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
2143
2144 while (1) {
2145 tmp = NCR5380_read(STATUS_REG);
2146 /* We only have a valid SCSI phase when REQ is asserted */
2147 if (tmp & SR_REQ) {
2148 phase = (tmp & PHASE_MASK);
2149 if (phase != old_phase) {
2150 old_phase = phase;
2151 #if (NDEBUG & NDEBUG_INFORMATION)
2152 NCR5380_print_phase(instance);
2153 #endif
2154 }
2155
2156 if (sink && (phase != PHASE_MSGOUT)) {
2157 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2158
2159 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
2160 ICR_ASSERT_ACK);
2161 while (NCR5380_read(STATUS_REG) & SR_REQ);
2162 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2163 ICR_ASSERT_ATN);
2164 sink = 0;
2165 continue;
2166 }
2167
2168 switch (phase) {
2169 case PHASE_DATAOUT:
2170 #if (NDEBUG & NDEBUG_NO_DATAOUT)
2171 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2172 "aborted\n", HOSTNO);
2173 sink = 1;
2174 do_abort(instance);
2175 cmd->result = DID_ERROR << 16;
2176 cmd->done(cmd);
2177 return;
2178 #endif
2179 case PHASE_DATAIN:
2180 /*
2181 * If there is no room left in the current buffer in the
2182 * scatter-gather list, move onto the next one.
2183 */
2184
2185 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2186 ++cmd->SCp.buffer;
2187 --cmd->SCp.buffers_residual;
2188 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2189 cmd->SCp.ptr = cmd->SCp.buffer->address;
2190 /* ++roman: Try to merge some scatter-buffers if
2191 * they are at consecutive physical addresses.
2192 */
2193 merge_consecutive_buffers( cmd );
2194 #if (NDEBUG & NDEBUG_INFORMATION)
2195 printk("scsi%d: %d bytes and %d buffers left\n",
2196 HOSTNO, cmd->SCp.this_residual,
2197 cmd->SCp.buffers_residual);
2198 #endif
2199 }
2200
2201 /*
2202 * The preferred transfer method is going to be
2203 * PSEUDO-DMA for systems that are strictly PIO,
2204 * since we can let the hardware do the handshaking.
2205 *
2206 * For this to work, we need to know the transfersize
2207 * ahead of time, since the pseudo-DMA code will sit
2208 * in an unconditional loop.
2209 */
2210
2211 /* ++roman: I suggest, this should be
2212 * #if def(REAL_DMA)
2213 * instead of leaving REAL_DMA out.
2214 */
2215
2216 #if defined(REAL_DMA)
2217 if (!cmd->device->borken &&
2218 (transfersize = NCR5380_dma_xfer_len(instance,cmd,phase)) > 31) {
2219 len = transfersize;
2220 cmd->SCp.phase = phase;
2221 if (NCR5380_transfer_dma(instance, &phase,
2222 &len, (unsigned char **) &cmd->SCp.ptr)) {
2223 /*
2224 * If the watchdog timer fires, all future
2225 * accesses to this device will use the
2226 * polled-IO. */
2227 printk("scsi%d: switching target %d lun %d to slow "
2228 "handshake\n", HOSTNO, cmd->target, cmd->lun);
2229 cmd->device->borken = 1;
2230 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2231 ICR_ASSERT_ATN);
2232 sink = 1;
2233 do_abort(instance);
2234 cmd->result = DID_ERROR << 16;
2235 cmd->done(cmd);
2236 /* XXX - need to source or sink data here, as appropriate */
2237 } else {
2238 #ifdef REAL_DMA
2239 /* ++roman: When using real DMA,
2240 * information_transfer() should return after
2241 * starting DMA since it has nothing more to
2242 * do.
2243 */
2244 return;
2245 #else
2246 cmd->SCp.this_residual -= transfersize - len;
2247 #endif
2248 }
2249 } else
2250 #endif /* defined(REAL_DMA) */
2251 NCR5380_transfer_pio(instance, &phase,
2252 (int *) &cmd->SCp.this_residual, (unsigned char **)
2253 &cmd->SCp.ptr);
2254 break;
2255 case PHASE_MSGIN:
2256 len = 1;
2257 data = &tmp;
2258 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
2259 NCR5380_transfer_pio(instance, &phase, &len, &data);
2260 cmd->SCp.Message = tmp;
2261
2262 switch (tmp) {
2263 /*
2264 * Linking lets us reduce the time required to get the
2265 * next command out to the device, hopefully this will
2266 * mean we don't waste another revolution due to the delays
2267 * required by ARBITRATION and another SELECTION.
2268 *
2269 * In the current implementation proposal, low level drivers
2270 * merely have to start the next command, pointed to by
2271 * next_link, done() is called as with unlinked commands.
2272 */
2273 #ifdef LINKED
2274 case LINKED_CMD_COMPLETE:
2275 case LINKED_FLG_CMD_COMPLETE:
2276 /* Accept message by clearing ACK */
2277 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2278
2279 #if (NDEBUG & NDEBUG_LINKED)
2280 printk("scsi%d: target %d lun %d linked command complete.\n",
2281 HOSTNO, cmd->target, cmd->lun);
2282 #endif
2283 /* Enable reselect interupts */
2284 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2285 /*
2286 * Sanity check : A linked command should only terminate
2287 * with one of these messages if there are more linked
2288 * commands available.
2289 */
2290
2291 if (!cmd->next_link) {
2292 printk("scsi%d: target %d lun %d linked command "
2293 "complete, no next_link\n",
2294 HOSTNO, cmd->target, cmd->lun);
2295 sink = 1;
2296 do_abort (instance);
2297 return;
2298 }
2299
2300 initialize_SCp(cmd->next_link);
2301 /* The next command is still part of this process; copy it
2302 * and don't free it! */
2303 cmd->next_link->tag = cmd->tag;
2304 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2305 #if (NDEBUG & NDEBUG_LINKED)
2306 printk("scsi%d: target %d lun %d linked request done, "
2307 "calling scsi_done().\n",
2308 HOSTNO, cmd->target, cmd->lun);
2309 #endif
2310 #ifdef NCR5380_STATS
2311 collect_stats(hostdata, cmd);
2312 #endif
2313 cmd->scsi_done(cmd);
2314 cmd = hostdata->connected;
2315 break;
2316 #endif /* def LINKED */
2317 case ABORT:
2318 case COMMAND_COMPLETE:
2319 /* Accept message by clearing ACK */
2320 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2321 /* ++guenther: possible race with Falcon locking */
2322 falcon_dont_release++;
2323 hostdata->connected = NULL;
2324 #if (NDEBUG & NDEBUG_QUEUES)
2325 printk("scsi%d: command for target %d, lun %d completed\n",
2326 HOSTNO, cmd->target, cmd->lun);
2327 #endif
2328 #ifdef SUPPORT_TAGS
2329 cmd_free_tag( cmd );
2330 if (cmd->SCp.Status == QUEUE_FULL) {
2331 /* Turn a QUEUE FULL status into BUSY, I think the
2332 * mid level cannot handle QUEUE FULL :-( (The
2333 * command is retried after BUSY). Also update our
2334 * queue size to the number of currently issued
2335 * commands now.
2336 */
2337 TAG_ALLOC *ta = &TagAlloc[cmd->target][cmd->lun];
2338 #if (NDEBUG & NDEBUG_TAGS)
2339 printk( "scsi%d: target %d lun %d returned "
2340 "QUEUE_FULL after %d commands\n",
2341 HOSTNO, cmd->target, cmd->lun,
2342 ta->nr_allocated );
2343 #endif
2344 if (ta->queue_size > ta->nr_allocated)
2345 ta->nr_allocated = ta->queue_size;
2346 cmd->SCp.Status = BUSY;
2347 }
2348 #else
2349 hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
2350 #endif
2351 /* Enable reselect interupts */
2352 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2353
2354 /*
2355 * I'm not sure what the correct thing to do here is :
2356 *
2357 * If the command that just executed is NOT a request
2358 * sense, the obvious thing to do is to set the result
2359 * code to the values of the stored parameters.
2360 *
2361 * If it was a REQUEST SENSE command, we need some way to
2362 * differentiate between the failure code of the original
2363 * and the failure code of the REQUEST sense - the obvious
2364 * case is success, where we fall through and leave the
2365 * result code unchanged.
2366 *
2367 * The non-obvious place is where the REQUEST SENSE failed
2368 */
2369
2370 if (cmd->cmnd[0] != REQUEST_SENSE)
2371 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2372 else if (cmd->SCp.Status != GOOD)
2373 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2374
2375 #ifdef AUTOSENSE
2376 if ((cmd->cmnd[0] != REQUEST_SENSE) &&
2377 (cmd->SCp.Status == CHECK_CONDITION)) {
2378 #if (NDEBUG & NDEBUG_AUTOSENSE)
2379 printk("scsi%d: performing request sense\n", HOSTNO);
2380 #endif
2381 cmd->cmnd[0] = REQUEST_SENSE;
2382 cmd->cmnd[1] &= 0xe0;
2383 cmd->cmnd[2] = 0;
2384 cmd->cmnd[3] = 0;
2385 cmd->cmnd[4] = sizeof(cmd->sense_buffer);
2386 cmd->cmnd[5] = 0;
2387
2388 cmd->SCp.buffer = NULL;
2389 cmd->SCp.buffers_residual = 0;
2390 cmd->SCp.ptr = (char *) cmd->sense_buffer;
2391 cmd->SCp.this_residual = sizeof(cmd->sense_buffer);
2392
2393 save_flags(flags);
2394 cli();
2395 LIST(cmd,hostdata->issue_queue);
2396 NEXT(cmd) = hostdata->issue_queue;
2397 hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2398 restore_flags(flags);
2399 #if (NDEBUG & NDEBUG_QUEUES)
2400 printk("scsi%d: REQUEST SENSE added to head of "
2401 "issue queue\n", H_NO(cmd));
2402 #endif
2403 } else
2404 #endif /* def AUTOSENSE */
2405 {
2406 #ifdef NCR5380_STATS
2407 collect_stats(hostdata, cmd);
2408 #endif
2409 cmd->scsi_done(cmd);
2410 }
2411
2412 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2413 /*
2414 * Restore phase bits to 0 so an interrupted selection,
2415 * arbitration can resume.
2416 */
2417 NCR5380_write(TARGET_COMMAND_REG, 0);
2418
2419 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2420 barrier();
2421
2422 falcon_dont_release--;
2423 /* ++roman: For Falcon SCSI, release the lock on the
2424 * ST-DMA here if no other commands are waiting on the
2425 * disconnected queue.
2426 */
2427 falcon_release_lock_if_possible( hostdata );
2428 return;
2429 case MESSAGE_REJECT:
2430 /* Accept message by clearing ACK */
2431 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2432 /* Enable reselect interupts */
2433 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2434 switch (hostdata->last_message) {
2435 case HEAD_OF_QUEUE_TAG:
2436 case ORDERED_QUEUE_TAG:
2437 case SIMPLE_QUEUE_TAG:
2438 /* The target obviously doesn't support tagged
2439 * queuing, even though it announced this ability in
2440 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2441 * clear 'tagged_supported' and lock the LUN, since
2442 * the command is treated as untagged furtheron.
2443 */
2444 cmd->device->tagged_supported = 0;
2445 hostdata->busy[cmd->target] |= (1 << cmd->lun);
2446 cmd->tag = TAG_NONE;
2447 #if (NDEBUG & NDEBUG_TAGS)
2448 printk( "scsi%d: target %d lun %d rejected QUEUE_TAG "
2449 "message; tagged queuing disabled\n",
2450 HOSTNO, cmd->target, cmd->lun );
2451 #endif
2452 break;
2453 }
2454 break;
2455 case DISCONNECT:
2456 /* Accept message by clearing ACK */
2457 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2458 save_flags(flags);
2459 cli();
2460 cmd->device->disconnect = 1;
2461 LIST(cmd,hostdata->disconnected_queue);
2462 NEXT(cmd) = hostdata->disconnected_queue;
2463 hostdata->connected = NULL;
2464 hostdata->disconnected_queue = cmd;
2465 restore_flags(flags);
2466 #if (NDEBUG & NDEBUG_QUEUES)
2467 printk("scsi%d: command for target %d lun %d was moved from connected to"
2468 " the disconnected_queue\n", HOSTNO,
2469 cmd->target, cmd->lun);
2470 #endif
2471 /*
2472 * Restore phase bits to 0 so an interrupted selection,
2473 * arbitration can resume.
2474 */
2475 NCR5380_write(TARGET_COMMAND_REG, 0);
2476
2477 /* Enable reselect interrupts */
2478 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2479 /* Wait for bus free to avoid nasty timeouts */
2480 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2481 barrier();
2482 return;
2483 /*
2484 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2485 * operation, in violation of the SCSI spec so we can safely
2486 * ignore SAVE/RESTORE pointers calls.
2487 *
2488 * Unfortunately, some disks violate the SCSI spec and
2489 * don't issue the required SAVE_POINTERS message before
2490 * disconnecting, and we have to break spec to remain
2491 * compatible.
2492 */
2493 case SAVE_POINTERS:
2494 case RESTORE_POINTERS:
2495 /* Accept message by clearing ACK */
2496 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2497 /* Enable reselect interupts */
2498 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2499 break;
2500 case EXTENDED_MESSAGE:
2501 /*
2502 * Extended messages are sent in the following format :
2503 * Byte
2504 * 0 EXTENDED_MESSAGE == 1
2505 * 1 length (includes one byte for code, doesn't
2506 * include first two bytes)
2507 * 2 code
2508 * 3..length+1 arguments
2509 *
2510 * Start the extended message buffer with the EXTENDED_MESSAGE
2511 * byte, since print_msg() wants the whole thing.
2512 */
2513 extended_msg[0] = EXTENDED_MESSAGE;
2514 /* Accept first byte by clearing ACK */
2515 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2516
2517 #if (NDEBUG & NDEBUG_EXTENDED)
2518 printk("scsi%d: receiving extended message\n", HOSTNO);
2519 #endif
2520
2521 len = 2;
2522 data = extended_msg + 1;
2523 phase = PHASE_MSGIN;
2524 NCR5380_transfer_pio(instance, &phase, &len, &data);
2525
2526 #if (NDEBUG & NDEBUG_EXTENDED)
2527 printk("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2528 (int) extended_msg[1],
2529 (int) extended_msg[2]);
2530 #endif
2531
2532 if (!len && extended_msg[1] <=
2533 (sizeof (extended_msg) - 1)) {
2534 /* Accept third byte by clearing ACK */
2535 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2536 len = extended_msg[1] - 1;
2537 data = extended_msg + 3;
2538 phase = PHASE_MSGIN;
2539
2540 NCR5380_transfer_pio(instance, &phase, &len, &data);
2541
2542 #if (NDEBUG & NDEBUG_EXTENDED)
2543 printk("scsi%d: message received, residual %d\n",
2544 HOSTNO, len);
2545 #endif
2546
2547 switch (extended_msg[2]) {
2548 case EXTENDED_SDTR:
2549 case EXTENDED_WDTR:
2550 case EXTENDED_MODIFY_DATA_POINTER:
2551 case EXTENDED_EXTENDED_IDENTIFY:
2552 tmp = 0;
2553 }
2554 } else if (len) {
2555 printk("scsi%d: error receiving extended message\n",
2556 HOSTNO);
2557 tmp = 0;
2558 } else {
2559 printk("scsi%d: extended message code %02x length %d is too long\n",
2560 HOSTNO, extended_msg[2], extended_msg[1]);
2561 tmp = 0;
2562 }
2563 /* Fall through to reject message */
2564
2565 /*
2566 * If we get something weird that we aren't expecting,
2567 * reject it.
2568 */
2569 default:
2570 if (!tmp) {
2571 printk("scsi%d: rejecting message ", HOSTNO);
2572 print_msg (extended_msg);
2573 printk("\n");
2574 } else if (tmp != EXTENDED_MESSAGE)
2575 printk("scsi%d: rejecting unknown message %02x from target %d, lun %d\n",
2576 HOSTNO, tmp, cmd->target, cmd->lun);
2577 else
2578 printk("scsi%d: rejecting unknown extended message "
2579 "code %02x, length %d from target %d, lun %d\n",
2580 HOSTNO, extended_msg[1], extended_msg[0],
2581 cmd->target, cmd->lun);
2582
2583
2584 msgout = MESSAGE_REJECT;
2585 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2586 ICR_ASSERT_ATN);
2587 break;
2588 } /* switch (tmp) */
2589 break;
2590 case PHASE_MSGOUT:
2591 len = 1;
2592 data = &msgout;
2593 hostdata->last_message = msgout;
2594 NCR5380_transfer_pio(instance, &phase, &len, &data);
2595 if (msgout == ABORT) {
2596 #ifdef SUPPORT_TAGS
2597 cmd_free_tag( cmd );
2598 #else
2599 hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
2600 #endif
2601 hostdata->connected = NULL;
2602 cmd->result = DID_ERROR << 16;
2603 #ifdef NCR5380_STATS
2604 collect_stats(hostdata, cmd);
2605 #endif
2606 cmd->scsi_done(cmd);
2607 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2608 falcon_release_lock_if_possible( hostdata );
2609 return;
2610 }
2611 msgout = NOP;
2612 break;
2613 case PHASE_CMDOUT:
2614 len = cmd->cmd_len;
2615 data = cmd->cmnd;
2616 /*
2617 * XXX for performance reasons, on machines with a
2618 * PSEUDO-DMA architecture we should probably
2619 * use the dma transfer function.
2620 */
2621 NCR5380_transfer_pio(instance, &phase, &len,
2622 &data);
2623 break;
2624 case PHASE_STATIN:
2625 len = 1;
2626 data = &tmp;
2627 NCR5380_transfer_pio(instance, &phase, &len, &data);
2628 cmd->SCp.Status = tmp;
2629 break;
2630 default:
2631 printk("scsi%d: unknown phase\n", HOSTNO);
2632 #ifdef NDEBUG
2633 NCR5380_print(instance);
2634 #endif
2635 } /* switch(phase) */
2636 } /* if (tmp * SR_REQ) */
2637 } /* while (1) */
2638 }
2639
2640 /*
2641 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2642 *
2643 * Purpose : does reselection, initializing the instance->connected
2644 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2645 * nexus has been reestablished,
2646 *
2647 * Inputs : instance - this instance of the NCR5380.
2648 *
2649 */
2650
2651
2652 static void NCR5380_reselect (struct Scsi_Host *instance)
/* */
2653 {
2654 SETUP_HOSTDATA(instance);
2655 unsigned char target_mask;
2656 unsigned char lun, phase;
2657 int len;
2658 #ifdef SUPPORT_TAGS
2659 unsigned char tag;
2660 #endif
2661 unsigned char msg[3];
2662 unsigned char *data;
2663 Scsi_Cmnd *tmp = NULL, *prev;
2664 /* unsigned long flags; */
2665
2666 /*
2667 * Disable arbitration, etc. since the host adapter obviously
2668 * lost, and tell an interrupted NCR5380_select() to restart.
2669 */
2670
2671 NCR5380_write(MODE_REG, MR_BASE);
2672 hostdata->restart_select = 1;
2673
2674 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2675
2676 #if (NDEBUG & NDEBUG_RESELECTION)
2677 printk("scsi%d: reselect\n", HOSTNO);
2678 #endif
2679
2680 /*
2681 * At this point, we have detected that our SCSI ID is on the bus,
2682 * SEL is true and BSY was false for at least one bus settle delay
2683 * (400 ns).
2684 *
2685 * We must assert BSY ourselves, until the target drops the SEL
2686 * signal.
2687 */
2688
2689 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2690
2691 while (NCR5380_read(STATUS_REG) & SR_SEL);
2692 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2693
2694 /*
2695 * Wait for target to go into MSGIN.
2696 */
2697
2698 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
2699
2700 len = 1;
2701 data = msg;
2702 phase = PHASE_MSGIN;
2703 NCR5380_transfer_pio(instance, &phase, &len, &data);
2704
2705 if (!msg[0] & 0x80) {
2706 printk("scsi%d: expecting IDENTIFY message, got ", HOSTNO);
2707 print_msg(msg);
2708 do_abort(instance);
2709 return;
2710 }
2711 lun = (msg[0] & 0x07);
2712
2713 #ifdef SUPPORT_TAGS
2714 /* If the phase is still MSGIN, the target wants to send some more
2715 * messages. In case it supports tagged queuing, this is probably a
2716 * SIMPLE_QEUE_TAG for the I_T_L_Q nexus.
2717 */
2718 tag = TAG_NONE;
2719 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2720 /* Accept previous IDENTIFY message by clearing ACK */
2721 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2722 len = 2;
2723 data = msg+1;
2724 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2725 msg[1] == SIMPLE_QUEUE_TAG)
2726 tag = msg[2];
2727 #if (NDEBUG & NDEBUG_TAGS)
2728 printk("scsi%d: target mask %02x, lun %d sent tag %d at reselection\n",
2729 HOSTNO, target_mask, lun, tag );
2730 #endif
2731 }
2732 #endif
2733
2734 /*
2735 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2736 * just reestablished, and remove it from the disconnected queue.
2737 */
2738
2739 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL;
2740 tmp; prev = tmp, tmp = NEXT(tmp) ) {
2741 if ((target_mask == (1 << tmp->target)) && (lun == tmp->lun)
2742 #ifdef SUPPORT_TAGS
2743 && (tag == tmp->tag)
2744 #endif
2745 ) {
2746 /* ++guenther: prevent race with falcon_release_lock */
2747 falcon_dont_release++;
2748 if (prev) {
2749 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
2750 NEXT(prev) = NEXT(tmp);
2751 } else {
2752 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2753 hostdata->disconnected_queue = NEXT(tmp);
2754 }
2755 NEXT(tmp) = NULL;
2756 break;
2757 }
2758 }
2759
2760 if (!tmp) {
2761 printk( "scsi%d: warning: target bitmask %02x lun %d "
2762 #ifdef SUPPORT_TAGS
2763 "tag %d "
2764 #endif
2765 "not in disconnect_queue.\n",
2766 HOSTNO, target_mask, lun
2767 #ifdef SUPPORT_TAGS
2768 , tag
2769 #endif
2770 );
2771 /*
2772 * Since we have an established nexus that we can't do anything
2773 * with, we must abort it.
2774 */
2775 do_abort(instance);
2776 return;
2777 }
2778
2779 /* Accept message by clearing ACK */
2780 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2781
2782 hostdata->connected = tmp;
2783 #if (NDEBUG & NDEBUG_RESELECTION)
2784 printk("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2785 HOSTNO, tmp->target, tmp->lun, tmp->tag);
2786 #endif
2787 falcon_dont_release--;
2788 }
2789
2790
2791 /*
2792 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2793 *
2794 * Purpose : abort a command
2795 *
2796 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2797 * host byte of the result field to, if zero DID_ABORTED is
2798 * used.
2799 *
2800 * Returns : 0 - success, -1 on failure.
2801 *
2802 * XXX - there is no way to abort the command that is currently
2803 * connected, you have to wait for it to complete. If this is
2804 * a problem, we could implement longjmp() / setjmp(), setjmp()
2805 * called where the loop started in NCR5380_main().
2806 */
2807
2808 #ifndef NCR5380_abort
2809 static
2810 #endif
2811 int NCR5380_abort (Scsi_Cmnd *cmd)
/* */
2812 {
2813 struct Scsi_Host *instance = cmd->host;
2814 SETUP_HOSTDATA(instance);
2815 Scsi_Cmnd *tmp, **prev;
2816 unsigned long flags;
2817
2818 printk("scsi%d: aborting command\n", HOSTNO);
2819 print_Scsi_Cmnd (cmd);
2820
2821 NCR5380_print_status (instance);
2822
2823 save_flags(flags);
2824 cli();
2825
2826 if (!IS_A_TT() && !falcon_got_lock)
2827 printk("scsi%d: !!BINGO!! Falcon has no lock in NCR5380_abort\n",
2828 HOSTNO);
2829
2830 #if (NDEBUG & NDEBUG_ABORT)
2831 printk("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
2832 NCR5380_read(BUS_AND_STATUS_REG),
2833 NCR5380_read(STATUS_REG));
2834 #endif
2835
2836 #if 0
2837 /*
2838 * Case 1 : If the command is the currently executing command,
2839 * we'll set the aborted flag and return control so that
2840 * information transfer routine can exit cleanly.
2841 */
2842
2843 if (hostdata->connected == cmd) {
2844 #if (NDEBUG & NDEBUG_ABORT)
2845 printk("scsi%d: aborting connected command\n", HOSTNO);
2846 #endif
2847 hostdata->aborted = 1;
2848 /*
2849 * We should perform BSY checking, and make sure we haven't slipped
2850 * into BUS FREE.
2851 */
2852
2853 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN);
2854 /*
2855 * Since we can't change phases until we've completed the current
2856 * handshake, we have to source or sink a byte of data if the current
2857 * phase is not MSGOUT.
2858 */
2859
2860 /*
2861 * Return control to the executing NCR drive so we can clear the
2862 * aborted flag and get back into our main loop.
2863 */
2864
2865 return 0;
2866 }
2867 #endif
2868
2869 /*
2870 * Case 2 : If the command hasn't been issued yet, we simply remove it
2871 * from the issue queue.
2872 */
2873 for (prev = (Scsi_Cmnd **) &(hostdata->issue_queue),
2874 tmp = (Scsi_Cmnd *) hostdata->issue_queue;
2875 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
2876 if (cmd == tmp) {
2877 REMOVE(5, *prev, tmp, NEXT(tmp));
2878 (*prev) = NEXT(tmp);
2879 NEXT(tmp) = NULL;
2880 tmp->result = DID_ABORT << 16;
2881 restore_flags(flags);
2882 #if (NDEBUG & NDEBUG_ABORT)
2883 printk("scsi%d: abort removed command from issue queue.\n",
2884 HOSTNO);
2885 #endif
2886 /* Tagged queuing note: no tag to free here, hasn't been assigned
2887 * yet... */
2888 tmp->done(tmp);
2889 falcon_release_lock_if_possible( hostdata );
2890 return SCSI_ABORT_SUCCESS;
2891 }
2892
2893 /*
2894 * Case 3 : If any commands are connected, we're going to fail the abort
2895 * and let the high level SCSI driver retry at a later time or
2896 * issue a reset.
2897 *
2898 * Timeouts, and therefore aborted commands, will be highly unlikely
2899 * and handling them cleanly in this situation would make the common
2900 * case of noresets less efficient, and would pollute our code. So,
2901 * we fail.
2902 */
2903
2904 if (hostdata->connected) {
2905 restore_flags(flags);
2906 #if (NDEBUG & NDEBUG_ABORT)
2907 printk("scsi%d: abort failed, command connected.\n", HOSTNO);
2908 #endif
2909 return SCSI_ABORT_NOT_RUNNING;
2910 }
2911
2912 /*
2913 * Case 4: If the command is currently disconnected from the bus, and
2914 * there are no connected commands, we reconnect the I_T_L or
2915 * I_T_L_Q nexus associated with it, go into message out, and send
2916 * an abort message.
2917 *
2918 * This case is especially ugly. In order to reestablish the nexus, we
2919 * need to call NCR5380_select(). The easiest way to implement this
2920 * function was to abort if the bus was busy, and let the interrupt
2921 * handler triggered on the SEL for reselect take care of lost arbitrations
2922 * where necessary, meaning interrupts need to be enabled.
2923 *
2924 * When interrupts are enabled, the queues may change - so we
2925 * can't remove it from the disconnected queue before selecting it
2926 * because that could cause a failure in hashing the nexus if that
2927 * device reselected.
2928 *
2929 * Since the queues may change, we can't use the pointers from when we
2930 * first locate it.
2931 *
2932 * So, we must first locate the command, and if NCR5380_select()
2933 * succeeds, then issue the abort, relocate the command and remove
2934 * it from the disconnected queue.
2935 */
2936
2937 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp;
2938 tmp = NEXT(tmp))
2939 if (cmd == tmp) {
2940 restore_flags(flags);
2941 #if (NDEBUG & NDEBUG_ABORT)
2942 printk("scsi%d: aborting disconnected command.\n", HOSTNO);
2943 #endif
2944
2945 if (NCR5380_select (instance, cmd, (int) cmd->tag))
2946 return SCSI_ABORT_BUSY;
2947
2948 #if (NDEBUG & NDEBUG_ABORT)
2949 printk("scsi%d: nexus reestablished.\n", HOSTNO);
2950 #endif
2951
2952 do_abort (instance);
2953
2954 save_flags(flags);
2955 cli();
2956 for (prev = (Scsi_Cmnd **) &(hostdata->disconnected_queue),
2957 tmp = (Scsi_Cmnd *) hostdata->disconnected_queue;
2958 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
2959 if (cmd == tmp) {
2960 REMOVE(5, *prev, tmp, NEXT(tmp));
2961 *prev = NEXT(tmp);
2962 NEXT(tmp) = NULL;
2963 tmp->result = DID_ABORT << 16;
2964 /* We must unlock the tag/LUN immediately here, since the
2965 * target goes to BUS FREE and doesn't send us another
2966 * message (COMMAND_COMPLETE or the like)
2967 */
2968 #ifdef SUPPORT_TAGS
2969 cmd_free_tag( tmp );
2970 #else
2971 hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
2972 #endif
2973 restore_flags(flags);
2974 tmp->done(tmp);
2975 falcon_release_lock_if_possible( hostdata );
2976 return SCSI_ABORT_SUCCESS;
2977 }
2978 }
2979
2980 /*
2981 * Case 5 : If we reached this point, the command was not found in any of
2982 * the queues.
2983 *
2984 * We probably reached this point because of an unlikely race condition
2985 * between the command completing successfully and the abortion code,
2986 * so we won't panic, but we will notify the user in case something really
2987 * broke.
2988 */
2989
2990 restore_flags(flags);
2991 printk("scsi%d: warning : SCSI command probably completed successfully\n"
2992 " before abortion\n", HOSTNO);
2993
2994 /* Maybe it is sufficient just to release the ST-DMA lock... (if
2995 * possible at all) At least, we should check if the lock could be
2996 * released after the abort, in case it is kept due to some bug.
2997 */
2998 falcon_release_lock_if_possible( hostdata );
2999
3000 return SCSI_ABORT_NOT_RUNNING;
3001 }
3002
3003
3004 /*
3005 * Function : int NCR5380_reset (Scsi_Cmnd *cmd)
3006 *
3007 * Purpose : reset the SCSI bus.
3008 *
3009 * Returns : SCSI_RESET_WAKEUP
3010 *
3011 */
3012
3013 static int NCR5380_reset( Scsi_Cmnd *cmd )
/* ![[last]](../icons/n_last.png)
*/
3014 {
3015 #if 0
3016 SETUP_HOSTDATA(cmd->host);
3017 int i;
3018 unsigned long flags;
3019 Scsi_Cmnd *connected, *disconnected_queue;
3020 #endif
3021
3022 if (!IS_A_TT() && !falcon_got_lock)
3023 printk("scsi%d: !!BINGO!! Falcon has no lock in NCR5380_reset\n",
3024 H_NO(cmd) );
3025
3026 NCR5380_print_status (cmd->host);
3027
3028 /* get in phase */
3029 NCR5380_write( TARGET_COMMAND_REG,
3030 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
3031 /* assert RST */
3032 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
3033 udelay (40);
3034 /* reset NCR registers */
3035 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
3036 NCR5380_write( MODE_REG, MR_BASE );
3037 NCR5380_write( TARGET_COMMAND_REG, 0 );
3038 NCR5380_write( SELECT_ENABLE_REG, 0 );
3039 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
3040 * through anymore ... */
3041 (void)NCR5380_read( RESET_PARITY_INTERRUPT_REG );
3042
3043 #if 0 /* XXX Now done by midlevel code XXX */
3044
3045 /* After the reset, there are no more connected or disconnected commands
3046 * and no busy units; to avoid problems with re-inserting the commands
3047 * into the issue_queue (via scsi_done()), the aborted commands are
3048 * remebered in local variables first.
3049 */
3050 save_flags(flags);
3051 cli();
3052 connected = (Scsi_Cmnd *)hostdata->connected;
3053 hostdata->connected = NULL;
3054 disconnected_queue = (Scsi_Cmnd *)hostdata->disconnected_queue;
3055 hostdata->disconnected_queue = NULL;
3056 #ifdef SUPPORT_TAGS
3057 free_all_tags();
3058 #endif
3059 for( i = 0; i < 8; ++i )
3060 hostdata->busy[i] = 0;
3061 #ifdef REAL_DMA
3062 hostdata->dma_len = 0;
3063 #endif
3064 restore_flags(flags);
3065
3066 if ((cmd = connected)) {
3067 #if (NDEBUG & NDEBUG_ABORT)
3068 printk( "scsi%d: reset aborted a connected command\n", H_NO(cmd));
3069 #endif
3070 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
3071 cmd->scsi_done( cmd );
3072 }
3073
3074 for (i = 0; (cmd = disconnected_queue); ++i) {
3075 disconnected_queue = NEXT(cmd);
3076 NEXT(cmd) = NULL;
3077 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
3078 cmd->scsi_done( cmd );
3079 }
3080 #if (NDEBUG & NDEBUG_ABORT)
3081 if (i > 0)
3082 printk( "scsi : reset aborted %d disconnected command(s)\n", i );
3083 #endif
3084
3085 /* The Falcon lock should be released after a reset...
3086 */
3087 /* ++guenther: moved to atari_scsi_reset(), to prevent a race between
3088 * unlocking and enabling dma interrupt.
3089 */
3090 /* falcon_release_lock_if_possible( hostdata );*/
3091
3092 #endif /* 0 */
3093
3094 return SCSI_RESET_WAKEUP;
3095 }
3096
3097 /* Local Variables: */
3098 /* tab-width: 8 */
3099 /* End: */
![[bottom]](../icons/n_bottom.png){kind=icon}
*/