2 * NCR 5380 generic driver routines. These should make it *trivial*
3 * to implement 5380 SCSI drivers under Linux with a non-trantor
6 * Note that these routines also work with NR53c400 family chips.
8 * Copyright 1993, Drew Eckhardt
10 * (Unix and Linux consulting and custom programming)
14 * DISTRIBUTION RELEASE 6.
16 * For more information, please consult
19 * SCSI Protocol Controller
22 * NCR Microelectronics
23 * 1635 Aeroplaza Drive
24 * Colorado Springs, CO 80916
30 * ++roman: To port the 5380 driver to the Atari, I had to do some changes in
33 * - Some of the debug statements were incorrect (undefined variables and the
34 * like). I fixed that.
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.
40 * - When using real DMA, information_transfer() should return in a DATAOUT
41 * phase after starting the DMA. It has nothing more to do.
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
50 * - I've added a function merge_contiguous_buffers() that tries to
51 * merge scatter-gather buffers that are located at contiguous
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.
57 * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA
58 * and USLEEP, because these were messing up readability and will never be
59 * needed for Atari SCSI.
61 * - I've revised the NCR5380_main() calling scheme (relax the 'main_running'
62 * stuff), and 'main' is executed in a bottom half if awoken by an
65 * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..."
66 * constructs. In my eyes, this made the source rather unreadable, so I
67 * finally replaced that by the *_PRINTK() macros.
72 * Further development / testing that should be done :
73 * 1. Test linked command handling code after Eric is ready with
74 * the high level code.
77 #if (NDEBUG & NDEBUG_LISTS)
79 { printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); \
80 if ((x)==(y)) udelay(5); }
81 #define REMOVE(w,x,y,z) \
82 { printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, \
83 (void*)(w), (void*)(x), (void*)(y), (void*)(z)); \
84 if ((x)==(y)) udelay(5); }
87 #define REMOVE(w,x,y,z)
98 * The other Linux SCSI drivers were written when Linux was Intel PC-only,
99 * and specifically for each board rather than each chip. This makes their
100 * adaptation to platforms like the Mac (Some of which use NCR5380's)
101 * more difficult than it has to be.
103 * Also, many of the SCSI drivers were written before the command queuing
104 * routines were implemented, meaning their implementations of queued
105 * commands were hacked on rather than designed in from the start.
107 * When I designed the Linux SCSI drivers I figured that
108 * while having two different SCSI boards in a system might be useful
109 * for debugging things, two of the same type wouldn't be used.
110 * Well, I was wrong and a number of users have mailed me about running
111 * multiple high-performance SCSI boards in a server.
113 * Finally, when I get questions from users, I have no idea what
114 * revision of my driver they are running.
116 * This driver attempts to address these problems :
117 * This is a generic 5380 driver. To use it on a different platform,
118 * one simply writes appropriate system specific macros (ie, data
119 * transfer - some PC's will use the I/O bus, 68K's must use
120 * memory mapped) and drops this file in their 'C' wrapper.
122 * As far as command queueing, two queues are maintained for
123 * each 5380 in the system - commands that haven't been issued yet,
124 * and commands that are currently executing. This means that an
125 * unlimited number of commands may be queued, letting
126 * more commands propagate from the higher driver levels giving higher
127 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
128 * allowing multiple commands to propagate all the way to a SCSI-II device
129 * while a command is already executing.
131 * To solve the multiple-boards-in-the-same-system problem,
132 * there is a separate instance structure for each instance
133 * of a 5380 in the system. So, multiple NCR5380 drivers will
134 * be able to coexist with appropriate changes to the high level
137 * A NCR5380_PUBLIC_REVISION macro is provided, with the release
138 * number (updated for each public release) printed by the
139 * NCR5380_print_options command, which should be called from the
140 * wrapper detect function, so that I know what release of the driver
143 * Issues specific to the NCR5380 :
145 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
146 * piece of hardware that requires you to sit in a loop polling for
147 * the REQ signal as long as you are connected. Some devices are
148 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
149 * while doing long seek operations.
151 * The workaround for this is to keep track of devices that have
152 * disconnected. If the device hasn't disconnected, for commands that
153 * should disconnect, we do something like
155 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
157 * Some tweaking of N and M needs to be done. An algorithm based
158 * on "time to data" would give the best results as long as short time
159 * to datas (ie, on the same track) were considered, however these
160 * broken devices are the exception rather than the rule and I'd rather
161 * spend my time optimizing for the normal case.
165 * At the heart of the design is a coroutine, NCR5380_main,
166 * which is started when not running by the interrupt handler,
167 * timer, and queue command function. It attempts to establish
168 * I_T_L or I_T_L_Q nexuses by removing the commands from the
169 * issue queue and calling NCR5380_select() if a nexus
170 * is not established.
172 * Once a nexus is established, the NCR5380_information_transfer()
173 * phase goes through the various phases as instructed by the target.
174 * if the target goes into MSG IN and sends a DISCONNECT message,
175 * the command structure is placed into the per instance disconnected
176 * queue, and NCR5380_main tries to find more work. If USLEEP
177 * was defined, and the target is idle for too long, the system
180 * If a command has disconnected, eventually an interrupt will trigger,
181 * calling NCR5380_intr() which will in turn call NCR5380_reselect
182 * to reestablish a nexus. This will run main if necessary.
184 * On command termination, the done function will be called as
187 * SCSI pointers are maintained in the SCp field of SCSI command
188 * structures, being initialized after the command is connected
189 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
190 * Note that in violation of the standard, an implicit SAVE POINTERS operation
191 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
196 * This file a skeleton Linux SCSI driver for the NCR 5380 series
197 * of chips. To use it, you write an architecture specific functions
198 * and macros and include this file in your driver.
200 * These macros control options :
201 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
202 * for commands that return with a CHECK CONDITION status.
204 * LINKED - if defined, linked commands are supported.
206 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
208 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
210 * These macros MUST be defined :
212 * NCR5380_read(register) - read from the specified register
214 * NCR5380_write(register, value) - write to the specific register
216 * Either real DMA *or* pseudo DMA may be implemented
218 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
219 * Note that the DMA setup functions should return the number of bytes
220 * that they were able to program the controller for.
222 * Also note that generic i386/PC versions of these macros are
223 * available as NCR5380_i386_dma_write_setup,
224 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
226 * NCR5380_dma_write_setup(instance, src, count) - initialize
227 * NCR5380_dma_read_setup(instance, dst, count) - initialize
228 * NCR5380_dma_residual(instance); - residual count
231 * NCR5380_pwrite(instance, src, count)
232 * NCR5380_pread(instance, dst, count);
234 * If nothing specific to this implementation needs doing (ie, with external
235 * hardware), you must also define
237 * NCR5380_queue_command
242 * to be the global entry points into the specific driver, ie
243 * #define NCR5380_queue_command t128_queue_command.
245 * If this is not done, the routines will be defined as static functions
246 * with the NCR5380* names and the user must provide a globally
247 * accessible wrapper function.
249 * The generic driver is initialized by calling NCR5380_init(instance),
250 * after setting the appropriate host specific fields and ID. If the
251 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
252 * possible) function may be used. Before the specific driver initialization
253 * code finishes, NCR5380_print_options should be called.
256 static struct Scsi_Host *first_instance = NULL;
257 static Scsi_Host_Template *the_template = NULL;
259 /* Macros ease life... :-) */
260 #define SETUP_HOSTDATA(in) \
261 struct NCR5380_hostdata *hostdata = \
262 (struct NCR5380_hostdata *)(in)->hostdata
263 #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
265 #define NEXT(cmd) ((Scsi_Cmnd *)((cmd)->host_scribble))
266 #define NEXTADDR(cmd) ((Scsi_Cmnd **)&((cmd)->host_scribble))
268 #define HOSTNO instance->host_no
269 #define H_NO(cmd) (cmd)->host->host_no
274 * Functions for handling tagged queuing
275 * =====================================
277 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
279 * Using consecutive numbers for the tags is no good idea in my eyes. There
280 * could be wrong re-usings if the counter (8 bit!) wraps and some early
281 * command has been preempted for a long time. My solution: a bitfield for
282 * remembering used tags.
284 * There's also the problem that each target has a certain queue size, but we
285 * cannot know it in advance :-( We just see a QUEUE_FULL status being
286 * returned. So, in this case, the driver internal queue size assumption is
287 * reduced to the number of active tags if QUEUE_FULL is returned by the
288 * target. The command is returned to the mid-level, but with status changed
289 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
292 * We're also not allowed running tagged commands as long as an untagged
293 * command is active. And REQUEST SENSE commands after a contingent allegiance
294 * condition _must_ be untagged. To keep track whether an untagged command has
295 * been issued, the host->busy array is still employed, as it is without
296 * support for tagged queuing.
298 * One could suspect that there are possible race conditions between
299 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
300 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
301 * which already guaranteed to be running at most once. It is also the only
302 * place where tags/LUNs are allocated. So no other allocation can slip
303 * between that pair, there could only happen a reselection, which can free a
304 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
305 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
308 /* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
310 #define TAG_NONE 0xff
313 DECLARE_BITMAP(allocated, MAX_TAGS);
318 static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */
321 static void __init init_tags( void )
326 if (!setup_use_tagged_queuing)
329 for( target = 0; target < 8; ++target ) {
330 for( lun = 0; lun < 8; ++lun ) {
331 ta = &TagAlloc[target][lun];
332 CLEAR_BITMAP( ta->allocated, MAX_TAGS );
333 ta->nr_allocated = 0;
334 /* At the beginning, assume the maximum queue size we could
335 * support (MAX_TAGS). This value will be decreased if the target
336 * returns QUEUE_FULL status.
338 ta->queue_size = MAX_TAGS;
344 /* Check if we can issue a command to this LUN: First see if the LUN is marked
345 * busy by an untagged command. If the command should use tagged queuing, also
346 * check that there is a free tag and the target's queue won't overflow. This
347 * function should be called with interrupts disabled to avoid race
351 static int is_lun_busy( Scsi_Cmnd *cmd, int should_be_tagged )
353 SETUP_HOSTDATA(cmd->host);
355 if (hostdata->busy[cmd->target] & (1 << cmd->lun))
357 if (!should_be_tagged ||
358 !setup_use_tagged_queuing || !cmd->device->tagged_supported)
360 if (TagAlloc[cmd->target][cmd->lun].nr_allocated >=
361 TagAlloc[cmd->target][cmd->lun].queue_size ) {
362 TAG_PRINTK( "scsi%d: target %d lun %d: no free tags\n",
363 H_NO(cmd), cmd->target, cmd->lun );
370 /* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
371 * must be called before!), or reserve the LUN in 'busy' if the command is
375 static void cmd_get_tag( Scsi_Cmnd *cmd, int should_be_tagged )
377 SETUP_HOSTDATA(cmd->host);
379 /* If we or the target don't support tagged queuing, allocate the LUN for
380 * an untagged command.
382 if (!should_be_tagged ||
383 !setup_use_tagged_queuing || !cmd->device->tagged_supported) {
385 hostdata->busy[cmd->target] |= (1 << cmd->lun);
386 TAG_PRINTK( "scsi%d: target %d lun %d now allocated by untagged "
387 "command\n", H_NO(cmd), cmd->target, cmd->lun );
390 TAG_ALLOC *ta = &TagAlloc[cmd->target][cmd->lun];
392 cmd->tag = find_first_zero_bit( ta->allocated, MAX_TAGS );
393 set_bit( cmd->tag, ta->allocated );
395 TAG_PRINTK( "scsi%d: using tag %d for target %d lun %d "
396 "(now %d tags in use)\n",
397 H_NO(cmd), cmd->tag, cmd->target, cmd->lun,
403 /* Mark the tag of command 'cmd' as free, or in case of an untagged command,
407 static void cmd_free_tag( Scsi_Cmnd *cmd )
409 SETUP_HOSTDATA(cmd->host);
411 if (cmd->tag == TAG_NONE) {
412 hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
413 TAG_PRINTK( "scsi%d: target %d lun %d untagged cmd finished\n",
414 H_NO(cmd), cmd->target, cmd->lun );
416 else if (cmd->tag >= MAX_TAGS) {
417 printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
418 H_NO(cmd), cmd->tag );
421 TAG_ALLOC *ta = &TagAlloc[cmd->target][cmd->lun];
422 clear_bit( cmd->tag, ta->allocated );
424 TAG_PRINTK( "scsi%d: freed tag %d for target %d lun %d\n",
425 H_NO(cmd), cmd->tag, cmd->target, cmd->lun );
430 static void free_all_tags( void )
435 if (!setup_use_tagged_queuing)
438 for( target = 0; target < 8; ++target ) {
439 for( lun = 0; lun < 8; ++lun ) {
440 ta = &TagAlloc[target][lun];
441 CLEAR_BITMAP( ta->allocated, MAX_TAGS );
442 ta->nr_allocated = 0;
447 #endif /* SUPPORT_TAGS */
451 * Function: void merge_contiguous_buffers( Scsi_Cmnd *cmd )
453 * Purpose: Try to merge several scatter-gather requests into one DMA
454 * transfer. This is possible if the scatter buffers lie on
455 * physical contiguous addresses.
457 * Parameters: Scsi_Cmnd *cmd
458 * The command to work on. The first scatter buffer's data are
459 * assumed to be already transfered into ptr/this_residual.
462 static void merge_contiguous_buffers( Scsi_Cmnd *cmd )
464 unsigned long endaddr;
465 #if (NDEBUG & NDEBUG_MERGING)
466 unsigned long oldlen = cmd->SCp.this_residual;
470 for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1;
471 cmd->SCp.buffers_residual &&
472 virt_to_phys(cmd->SCp.buffer[1].address) == endaddr; ) {
474 MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
475 cmd->SCp.buffer[1].address, endaddr);
476 #if (NDEBUG & NDEBUG_MERGING)
480 --cmd->SCp.buffers_residual;
481 cmd->SCp.this_residual += cmd->SCp.buffer->length;
482 endaddr += cmd->SCp.buffer->length;
484 #if (NDEBUG & NDEBUG_MERGING)
485 if (oldlen != cmd->SCp.this_residual)
486 MER_PRINTK("merged %d buffers from %p, new length %08x\n",
487 cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
492 * Function : void initialize_SCp(Scsi_Cmnd *cmd)
494 * Purpose : initialize the saved data pointers for cmd to point to the
495 * start of the buffer.
497 * Inputs : cmd - Scsi_Cmnd structure to have pointers reset.
500 static __inline__ void initialize_SCp(Scsi_Cmnd *cmd)
503 * Initialize the Scsi Pointer field so that all of the commands in the
504 * various queues are valid.
508 cmd->SCp.buffer = (struct scatterlist *) cmd->buffer;
509 cmd->SCp.buffers_residual = cmd->use_sg - 1;
510 cmd->SCp.ptr = (char *) cmd->SCp.buffer->address;
511 cmd->SCp.this_residual = cmd->SCp.buffer->length;
512 /* ++roman: Try to merge some scatter-buffers if they are at
513 * contiguous physical addresses.
515 merge_contiguous_buffers( cmd );
517 cmd->SCp.buffer = NULL;
518 cmd->SCp.buffers_residual = 0;
519 cmd->SCp.ptr = (char *) cmd->request_buffer;
520 cmd->SCp.this_residual = cmd->request_bufflen;
524 #include <linux/config.h>
525 #include <linux/delay.h>
531 signals[] = {{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" },
532 { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" },
533 { SR_SEL, "SEL" }, {0, NULL}},
534 basrs[] = {{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}},
535 icrs[] = {{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
536 {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"},
537 {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"},
539 mrs[] = {{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"},
540 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR,
541 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"},
542 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
543 {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"},
547 * Function : void NCR5380_print(struct Scsi_Host *instance)
549 * Purpose : print the SCSI bus signals for debugging purposes
551 * Input : instance - which NCR5380
554 static void NCR5380_print(struct Scsi_Host *instance) {
555 unsigned char status, data, basr, mr, icr, i;
560 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
561 status = NCR5380_read(STATUS_REG);
562 mr = NCR5380_read(MODE_REG);
563 icr = NCR5380_read(INITIATOR_COMMAND_REG);
564 basr = NCR5380_read(BUS_AND_STATUS_REG);
565 restore_flags(flags);
566 printk("STATUS_REG: %02x ", status);
567 for (i = 0; signals[i].mask ; ++i)
568 if (status & signals[i].mask)
569 printk(",%s", signals[i].name);
570 printk("\nBASR: %02x ", basr);
571 for (i = 0; basrs[i].mask ; ++i)
572 if (basr & basrs[i].mask)
573 printk(",%s", basrs[i].name);
574 printk("\nICR: %02x ", icr);
575 for (i = 0; icrs[i].mask; ++i)
576 if (icr & icrs[i].mask)
577 printk(",%s", icrs[i].name);
578 printk("\nMODE: %02x ", mr);
579 for (i = 0; mrs[i].mask; ++i)
580 if (mr & mrs[i].mask)
581 printk(",%s", mrs[i].name);
589 {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
590 {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
591 {PHASE_UNKNOWN, "UNKNOWN"}};
594 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
596 * Purpose : print the current SCSI phase for debugging purposes
598 * Input : instance - which NCR5380
601 static void NCR5380_print_phase(struct Scsi_Host *instance)
603 unsigned char status;
606 status = NCR5380_read(STATUS_REG);
607 if (!(status & SR_REQ))
608 printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
610 for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
611 (phases[i].value != (status & PHASE_MASK)); ++i);
612 printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name);
619 __inline__ void NCR5380_print(struct Scsi_Host *instance) { };
620 __inline__ void NCR5380_print_phase(struct Scsi_Host *instance) { };
625 * ++roman: New scheme of calling NCR5380_main()
627 * If we're not in an interrupt, we can call our main directly, it cannot be
628 * already running. Else, we queue it on a task queue, if not 'main_running'
629 * tells us that a lower level is already executing it. This way,
630 * 'main_running' needs not be protected in a special way.
632 * queue_main() is a utility function for putting our main onto the task
633 * queue, if main_running is false. It should be called only from a
634 * interrupt or bottom half.
637 #include <linux/tqueue.h>
638 #include <linux/interrupt.h>
640 static volatile int main_running = 0;
641 static struct tq_struct NCR5380_tqueue = {
642 routine: (void (*)(void*))NCR5380_main /* must have (void *) arg... */
645 static __inline__ void queue_main(void)
648 /* If in interrupt and NCR5380_main() not already running,
649 queue it on the 'immediate' task queue, to be processed
650 immediately after the current interrupt processing has
652 queue_task(&NCR5380_tqueue, &tq_immediate);
653 mark_bh(IMMEDIATE_BH);
655 /* else: nothing to do: the running NCR5380_main() will pick up
656 any newly queued command. */
660 static inline void NCR5380_all_init (void)
664 INI_PRINTK("scsi : NCR5380_all_init()\n");
671 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
673 * Purpose : called by probe code indicating the NCR5380 driver
674 * options that were selected.
676 * Inputs : instance, pointer to this instance. Unused.
679 static void __init NCR5380_print_options (struct Scsi_Host *instance)
681 printk(" generic options"
692 " SCSI-2 TAGGED QUEUING"
695 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
699 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
701 * Purpose : print commands in the various queues, called from
702 * NCR5380_abort and NCR5380_debug to aid debugging.
704 * Inputs : instance, pointer to this instance.
707 static void NCR5380_print_status (struct Scsi_Host *instance)
713 NCR_PRINT(NDEBUG_ANY);
714 NCR_PRINT_PHASE(NDEBUG_ANY);
716 pr_bfr = (char *) __get_free_page(GFP_ATOMIC);
718 printk("NCR5380_print_status: no memory for print buffer\n");
721 len = NCR5380_proc_info(pr_bfr, &start, 0, PAGE_SIZE, HOSTNO, 0);
723 printk("\n%s\n", pr_bfr);
724 free_page((unsigned long) pr_bfr);
728 /******************************************/
730 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
732 * *buffer: I/O buffer
733 * **start: if inout == FALSE pointer into buffer where user read should start
734 * offset: current offset
735 * length: length of buffer
736 * hostno: Scsi_Host host_no
737 * inout: TRUE - user is writing; FALSE - user is reading
739 * Return the number of bytes read from or written
743 #define SPRINTF(fmt,args...) \
744 do { if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \
745 pos += sprintf(pos, fmt , ## args); } while(0)
747 char *lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length);
749 #ifndef NCR5380_proc_info
752 int NCR5380_proc_info (char *buffer, char **start, off_t offset,
753 int length, int hostno, int inout)
756 struct Scsi_Host *instance;
757 struct NCR5380_hostdata *hostdata;
761 #define check_offset() \
763 if (pos - buffer < offset - begin) { \
764 begin += pos - buffer; \
769 for (instance = first_instance; instance && HOSTNO != hostno;
770 instance = instance->next)
774 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
776 if (inout) { /* Has data been written to the file ? */
777 return(-ENOSYS); /* Currently this is a no-op */
779 SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
783 SPRINTF("NCR5380: coroutine is%s running.\n", main_running ? "" : "n't");
785 if (!hostdata->connected)
786 SPRINTF("scsi%d: no currently connected command\n", HOSTNO);
788 pos = lprint_Scsi_Cmnd ((Scsi_Cmnd *) hostdata->connected,
789 pos, buffer, length);
790 SPRINTF("scsi%d: issue_queue\n", HOSTNO);
792 for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = NEXT(ptr)) {
793 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
797 SPRINTF("scsi%d: disconnected_queue\n", HOSTNO);
799 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
801 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
805 restore_flags(flags);
806 *start = buffer + (offset - begin);
807 if (pos - buffer < offset - begin)
809 else if (pos - buffer - (offset - begin) < length)
810 return pos - buffer - (offset - begin);
815 lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length)
818 unsigned char *command;
819 SPRINTF("scsi%d: destination target %d, lun %d\n",
820 H_NO(cmd), cmd->target, cmd->lun);
821 SPRINTF(" command = ");
823 SPRINTF("%2d (0x%02x)", command[0], command[0]);
824 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
825 SPRINTF(" %02x", command[i]);
832 * Function : void NCR5380_init (struct Scsi_Host *instance)
834 * Purpose : initializes *instance and corresponding 5380 chip.
836 * Inputs : instance - instantiation of the 5380 driver.
838 * Notes : I assume that the host, hostno, and id bits have been
839 * set correctly. I don't care about the irq and other fields.
843 static void __init NCR5380_init (struct Scsi_Host *instance, int flags)
846 SETUP_HOSTDATA(instance);
850 hostdata->aborted = 0;
851 hostdata->id_mask = 1 << instance->this_id;
852 hostdata->id_higher_mask = 0;
853 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
854 if (i > hostdata->id_mask)
855 hostdata->id_higher_mask |= i;
856 for (i = 0; i < 8; ++i)
857 hostdata->busy[i] = 0;
861 #if defined (REAL_DMA)
862 hostdata->dma_len = 0;
864 hostdata->targets_present = 0;
865 hostdata->connected = NULL;
866 hostdata->issue_queue = NULL;
867 hostdata->disconnected_queue = NULL;
868 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
871 the_template = instance->hostt;
872 first_instance = instance;
877 if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1))
878 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
879 " without AUTOSENSE option, contingent allegiance conditions may\n"
880 " be incorrectly cleared.\n", HOSTNO);
881 #endif /* def AUTOSENSE */
883 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
884 NCR5380_write(MODE_REG, MR_BASE);
885 NCR5380_write(TARGET_COMMAND_REG, 0);
886 NCR5380_write(SELECT_ENABLE_REG, 0);
890 * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd,
891 * void (*done)(Scsi_Cmnd *))
893 * Purpose : enqueues a SCSI command
895 * Inputs : cmd - SCSI command, done - function called on completion, with
896 * a pointer to the command descriptor.
901 * cmd is added to the per instance issue_queue, with minor
902 * twiddling done to the host specific fields of cmd. If the
903 * main coroutine is not running, it is restarted.
907 /* Only make static if a wrapper function is used */
908 #ifndef NCR5380_queue_command
911 int NCR5380_queue_command (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
913 SETUP_HOSTDATA(cmd->host);
917 extern int update_timeout(Scsi_Cmnd * SCset, int timeout);
919 #if (NDEBUG & NDEBUG_NO_WRITE)
920 switch (cmd->cmnd[0]) {
923 printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
925 cmd->result = (DID_ERROR << 16);
929 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
934 if (!hostdata->connected && !hostdata->issue_queue &&
935 !hostdata->disconnected_queue) {
936 hostdata->timebase = jiffies;
939 # ifdef NCR5380_STAT_LIMIT
940 if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
942 switch (cmd->cmnd[0])
947 hostdata->time_write[cmd->target] -= (jiffies - hostdata->timebase);
948 hostdata->bytes_write[cmd->target] += cmd->request_bufflen;
949 hostdata->pendingw++;
954 hostdata->time_read[cmd->target] -= (jiffies - hostdata->timebase);
955 hostdata->bytes_read[cmd->target] += cmd->request_bufflen;
956 hostdata->pendingr++;
962 * We use the host_scribble field as a pointer to the next command
967 cmd->scsi_done = done;
973 * Insert the cmd into the issue queue. Note that REQUEST SENSE
974 * commands are added to the head of the queue since any command will
975 * clear the contingent allegiance condition that exists and the
976 * sense data is only guaranteed to be valid while the condition exists.
981 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
982 * Otherwise a running NCR5380_main may steal the lock.
983 * Lock before actually inserting due to fairness reasons explained in
984 * atari_scsi.c. If we insert first, then it's impossible for this driver
985 * to release the lock.
986 * Stop timer for this command while waiting for the lock, or timeouts
987 * may happen (and they really do), and it's no good if the command doesn't
988 * appear in any of the queues.
989 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
990 * because also a timer int can trigger an abort or reset, which would
991 * alter queues and touch the lock.
994 oldto = update_timeout(cmd, 0);
996 update_timeout(cmd, oldto);
998 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
999 LIST(cmd, hostdata->issue_queue);
1000 NEXT(cmd) = hostdata->issue_queue;
1001 hostdata->issue_queue = cmd;
1003 for (tmp = (Scsi_Cmnd *)hostdata->issue_queue;
1004 NEXT(tmp); tmp = NEXT(tmp))
1009 restore_flags(flags);
1011 QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd),
1012 (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
1014 /* If queue_command() is called from an interrupt (real one or bottom
1015 * half), we let queue_main() do the job of taking care about main. If it
1016 * is already running, this is a no-op, else main will be queued.
1018 * If we're not in an interrupt, we can call NCR5380_main()
1019 * unconditionally, because it cannot be already running.
1021 if (in_interrupt() || ((flags >> 8) & 7) >= 6)
1029 * Function : NCR5380_main (void)
1031 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1032 * be done on the NCR5380 host adapters in a system. Both
1033 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1034 * in case it is not running.
1036 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
1037 * reenable them. This prevents reentrancy and kernel stack overflow.
1040 static void NCR5380_main (void)
1042 Scsi_Cmnd *tmp, *prev;
1043 struct Scsi_Host *instance = first_instance;
1044 struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
1046 unsigned long flags;
1049 * We run (with interrupts disabled) until we're sure that none of
1050 * the host adapters have anything that can be done, at which point
1051 * we set main_running to 0 and exit.
1053 * Interrupts are enabled before doing various other internal
1054 * instructions, after we've decided that we need to run through
1057 * this should prevent any race conditions.
1059 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1060 * because also a timer int can trigger an abort or reset, which can
1061 * alter queues and touch the Falcon lock.
1064 /* Tell int handlers main() is now already executing. Note that
1065 no races are possible here. If an int comes in before
1066 'main_running' is set here, and queues/executes main via the
1067 task queue, it doesn't do any harm, just this instance of main
1068 won't find any work left to do. */
1075 cli(); /* Freeze request queues */
1078 if (!hostdata->connected) {
1079 MAIN_PRINTK( "scsi%d: not connected\n", HOSTNO );
1081 * Search through the issue_queue for a command destined
1082 * for a target that's not busy.
1084 #if (NDEBUG & NDEBUG_LISTS)
1085 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL;
1086 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1088 /*printk("%p ", tmp);*/
1089 if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/
1091 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue,
1092 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) {
1094 #if (NDEBUG & NDEBUG_LISTS)
1096 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
1097 tmp, tmp->target, hostdata->busy[tmp->target],
1100 /* When we find one, remove it from the issue queue. */
1101 /* ++guenther: possible race with Falcon locking */
1104 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
1106 !(hostdata->busy[tmp->target] & (1 << tmp->lun))
1109 cli(); /* ++guenther: just to be sure, this must be atomic */
1111 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
1112 NEXT(prev) = NEXT(tmp);
1114 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1115 hostdata->issue_queue = NEXT(tmp);
1118 falcon_dont_release++;
1120 /* reenable interrupts after finding one */
1121 restore_flags(flags);
1124 * Attempt to establish an I_T_L nexus here.
1125 * On success, instance->hostdata->connected is set.
1126 * On failure, we must add the command back to the
1127 * issue queue so we can keep trying.
1129 MAIN_PRINTK("scsi%d: main(): command for target %d "
1130 "lun %d removed from issue_queue\n",
1131 HOSTNO, tmp->target, tmp->lun);
1133 * REQUEST SENSE commands are issued without tagged
1134 * queueing, even on SCSI-II devices because the
1135 * contingent allegiance condition exists for the
1138 /* ++roman: ...and the standard also requires that
1139 * REQUEST SENSE command are untagged.
1143 cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE );
1145 if (!NCR5380_select(instance, tmp,
1146 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
1148 falcon_dont_release--;
1149 /* release if target did not response! */
1150 falcon_release_lock_if_possible( hostdata );
1154 LIST(tmp, hostdata->issue_queue);
1155 NEXT(tmp) = hostdata->issue_queue;
1156 hostdata->issue_queue = tmp;
1158 cmd_free_tag( tmp );
1160 falcon_dont_release--;
1161 restore_flags(flags);
1162 MAIN_PRINTK("scsi%d: main(): select() failed, "
1163 "returned to issue_queue\n", HOSTNO);
1164 if (hostdata->connected)
1167 } /* if target/lun/target queue is not busy */
1168 } /* for issue_queue */
1169 } /* if (!hostdata->connected) */
1171 if (hostdata->connected
1173 && !hostdata->dma_len
1176 restore_flags(flags);
1177 MAIN_PRINTK("scsi%d: main: performing information transfer\n",
1179 NCR5380_information_transfer(instance);
1180 MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
1185 /* Better allow ints _after_ 'main_running' has been cleared, else
1186 an interrupt could believe we'll pick up the work it left for
1187 us, but we won't see it anymore here... */
1189 restore_flags(flags);
1195 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1197 * Purpose : Called by interrupt handler when DMA finishes or a phase
1198 * mismatch occurs (which would finish the DMA transfer).
1200 * Inputs : instance - this instance of the NCR5380.
1204 static void NCR5380_dma_complete( struct Scsi_Host *instance )
1206 SETUP_HOSTDATA(instance);
1207 int transfered, saved_data = 0, overrun = 0, cnt, toPIO;
1208 unsigned char **data, p;
1209 volatile int *count;
1211 if (!hostdata->connected) {
1212 printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
1213 "no connected cmd\n", HOSTNO);
1217 if (atari_read_overruns) {
1218 p = hostdata->connected->SCp.phase;
1221 if ((((NCR5380_read(BUS_AND_STATUS_REG)) &
1222 (BASR_PHASE_MATCH|BASR_ACK)) ==
1223 (BASR_PHASE_MATCH|BASR_ACK))) {
1224 saved_data = NCR5380_read(INPUT_DATA_REG);
1226 DMA_PRINTK("scsi%d: read overrun handled\n", HOSTNO);
1231 DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1232 HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
1233 NCR5380_read(STATUS_REG));
1235 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1236 NCR5380_write(MODE_REG, MR_BASE);
1237 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1239 transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
1240 hostdata->dma_len = 0;
1242 data = (unsigned char **) &(hostdata->connected->SCp.ptr);
1243 count = &(hostdata->connected->SCp.this_residual);
1244 *data += transfered;
1245 *count -= transfered;
1247 if (atari_read_overruns) {
1248 if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) {
1249 cnt = toPIO = atari_read_overruns;
1251 DMA_PRINTK("Got an input overrun, using saved byte\n");
1252 *(*data)++ = saved_data;
1257 DMA_PRINTK("Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data);
1258 NCR5380_transfer_pio(instance, &p, &cnt, data);
1259 *count -= toPIO - cnt;
1263 #endif /* REAL_DMA */
1267 * Function : void NCR5380_intr (int irq)
1269 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1270 * from the disconnected queue, and restarting NCR5380_main()
1273 * Inputs : int irq, irq that caused this interrupt.
1277 static void NCR5380_intr (int irq, void *dev_id, struct pt_regs *regs)
1279 struct Scsi_Host *instance = first_instance;
1283 INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
1285 /* Look for pending interrupts */
1286 basr = NCR5380_read(BUS_AND_STATUS_REG);
1287 INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
1288 /* dispatch to appropriate routine if found and done=0 */
1289 if (basr & BASR_IRQ) {
1290 NCR_PRINT(NDEBUG_INTR);
1291 if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
1294 INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
1295 NCR5380_reselect(instance);
1296 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1298 else if (basr & BASR_PARITY_ERROR) {
1299 INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
1300 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1302 else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1303 INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
1304 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1308 * The rest of the interrupt conditions can occur only during a
1312 #if defined(REAL_DMA)
1314 * We should only get PHASE MISMATCH and EOP interrupts if we have
1315 * DMA enabled, so do a sanity check based on the current setting
1316 * of the MODE register.
1319 if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
1320 ((basr & BASR_END_DMA_TRANSFER) ||
1321 !(basr & BASR_PHASE_MATCH))) {
1323 INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
1324 NCR5380_dma_complete( instance );
1328 #endif /* REAL_DMA */
1330 /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1331 if (basr & BASR_PHASE_MATCH)
1332 printk(KERN_NOTICE "scsi%d: unknown interrupt, "
1333 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1334 HOSTNO, basr, NCR5380_read(MODE_REG),
1335 NCR5380_read(STATUS_REG));
1336 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1338 } /* if !(SELECTION || PARITY) */
1341 printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
1342 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
1343 NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
1344 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1348 INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
1349 /* Put a call to NCR5380_main() on the queue... */
1354 #ifdef NCR5380_STATS
1355 static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd* cmd)
1357 # ifdef NCR5380_STAT_LIMIT
1358 if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
1360 switch (cmd->cmnd[0])
1365 hostdata->time_write[cmd->target] += (jiffies - hostdata->timebase);
1366 /*hostdata->bytes_write[cmd->target] += cmd->request_bufflen;*/
1367 hostdata->pendingw--;
1372 hostdata->time_read[cmd->target] += (jiffies - hostdata->timebase);
1373 /*hostdata->bytes_read[cmd->target] += cmd->request_bufflen;*/
1374 hostdata->pendingr--;
1381 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
1384 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1385 * including ARBITRATION, SELECTION, and initial message out for
1386 * IDENTIFY and queue messages.
1388 * Inputs : instance - instantiation of the 5380 driver on which this
1389 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1390 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1391 * the command that is presently connected.
1393 * Returns : -1 if selection could not execute for some reason,
1394 * 0 if selection succeeded or failed because the target
1398 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1399 * with registers as they should have been on entry - ie
1400 * SELECT_ENABLE will be set appropriately, the NCR5380
1401 * will cease to drive any SCSI bus signals.
1403 * If successful : I_T_L or I_T_L_Q nexus will be established,
1404 * instance->connected will be set to cmd.
1405 * SELECT interrupt will be disabled.
1407 * If failed (no target) : cmd->scsi_done() will be called, and the
1408 * cmd->result host byte set to DID_BAD_TARGET.
1411 static int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, int tag)
1413 SETUP_HOSTDATA(instance);
1414 unsigned char tmp[3], phase;
1415 unsigned char *data;
1417 unsigned long timeout;
1418 unsigned long flags;
1420 hostdata->restart_select = 0;
1421 NCR_PRINT(NDEBUG_ARBITRATION);
1422 ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO,
1426 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1427 * data bus during SELECTION.
1432 if (hostdata->connected) {
1433 restore_flags(flags);
1436 NCR5380_write(TARGET_COMMAND_REG, 0);
1440 * Start arbitration.
1443 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1444 NCR5380_write(MODE_REG, MR_ARBITRATE);
1446 restore_flags(flags);
1448 /* Wait for arbitration logic to complete */
1451 unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
1453 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1454 && time_before(jiffies, timeout) && !hostdata->connected)
1456 if (time_after_eq(jiffies, timeout))
1458 printk("scsi : arbitration timeout at %d\n", __LINE__);
1459 NCR5380_write(MODE_REG, MR_BASE);
1460 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1464 #else /* NCR_TIMEOUT */
1465 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1466 && !hostdata->connected);
1469 ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
1471 if (hostdata->connected) {
1472 NCR5380_write(MODE_REG, MR_BASE);
1476 * The arbitration delay is 2.2us, but this is a minimum and there is
1477 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1478 * the integral nature of udelay().
1484 /* Check for lost arbitration */
1485 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1486 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1487 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1488 hostdata->connected) {
1489 NCR5380_write(MODE_REG, MR_BASE);
1490 ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1495 /* after/during arbitration, BSY should be asserted.
1496 IBM DPES-31080 Version S31Q works now */
1497 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1498 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL |
1501 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1502 hostdata->connected) {
1503 NCR5380_write(MODE_REG, MR_BASE);
1504 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1505 ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1511 * Again, bus clear + bus settle time is 1.2us, however, this is
1512 * a minimum so we'll udelay ceil(1.2)
1515 #ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1516 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1522 if (hostdata->connected) {
1523 NCR5380_write(MODE_REG, MR_BASE);
1524 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1528 ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
1531 * Now that we have won arbitration, start Selection process, asserting
1532 * the host and target ID's on the SCSI bus.
1535 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->target)));
1538 * Raise ATN while SEL is true before BSY goes false from arbitration,
1539 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1540 * phase immediately after selection.
1543 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
1544 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
1545 NCR5380_write(MODE_REG, MR_BASE);
1548 * Reselect interrupts must be turned off prior to the dropping of BSY,
1549 * otherwise we will trigger an interrupt.
1552 if (hostdata->connected) {
1553 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1557 NCR5380_write(SELECT_ENABLE_REG, 0);
1560 * The initiator shall then wait at least two deskew delays and release
1563 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1566 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
1567 ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1570 * Something weird happens when we cease to drive BSY - looks
1571 * like the board/chip is letting us do another read before the
1572 * appropriate propagation delay has expired, and we're confusing
1573 * a BSY signal from ourselves as the target's response to SELECTION.
1575 * A small delay (the 'C++' frontend breaks the pipeline with an
1576 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1577 * tighter 'C' code breaks and requires this) solves the problem -
1578 * the 1 us delay is arbitrary, and only used because this delay will
1579 * be the same on other platforms and since it works here, it should
1582 * wingel suggests that this could be due to failing to wait
1588 SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->target);
1591 * The SCSI specification calls for a 250 ms timeout for the actual
1595 timeout = jiffies + 25;
1598 * XXX very interesting - we're seeing a bounce where the BSY we
1599 * asserted is being reflected / still asserted (propagation delay?)
1600 * and it's detecting as true. Sigh.
1604 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1605 * IO while SEL is true. But again, there are some disks out the in the
1606 * world that do that nevertheless. (Somebody claimed that this announces
1607 * reselection capability of the target.) So we better skip that test and
1608 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
1611 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) &
1614 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) ==
1616 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1617 NCR5380_reselect(instance);
1618 printk (KERN_ERR "scsi%d: reselection after won arbitration?\n",
1620 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1624 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY));
1628 * No less than two deskew delays after the initiator detects the
1629 * BSY signal is true, it shall release the SEL signal and may
1630 * change the DATA BUS. -wingel
1635 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1637 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1638 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1639 if (hostdata->targets_present & (1 << cmd->target)) {
1640 printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
1641 if (hostdata->restart_select)
1642 printk(KERN_NOTICE "\trestart select\n");
1643 NCR_PRINT(NDEBUG_ANY);
1644 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1647 cmd->result = DID_BAD_TARGET << 16;
1648 #ifdef NCR5380_STATS
1649 collect_stats(hostdata, cmd);
1652 cmd_free_tag( cmd );
1654 cmd->scsi_done(cmd);
1655 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1656 SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
1657 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1661 hostdata->targets_present |= (1 << cmd->target);
1664 * Since we followed the SCSI spec, and raised ATN while SEL
1665 * was true but before BSY was false during selection, the information
1666 * transfer phase should be a MESSAGE OUT phase so that we can send the
1669 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1670 * message (2 bytes) with a tag ID that we increment with every command
1671 * until it wraps back to 0.
1673 * XXX - it turns out that there are some broken SCSI-II devices,
1674 * which claim to support tagged queuing but fail when more than
1675 * some number of commands are issued at once.
1678 /* Wait for start of REQ/ACK handshake */
1679 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
1681 SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1682 HOSTNO, cmd->target);
1683 tmp[0] = IDENTIFY(1, cmd->lun);
1686 if (cmd->tag != TAG_NONE) {
1687 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1695 #endif /* SUPPORT_TAGS */
1697 /* Send message(s) */
1699 phase = PHASE_MSGOUT;
1700 NCR5380_transfer_pio(instance, &phase, &len, &data);
1701 SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
1702 /* XXX need to handle errors here */
1703 hostdata->connected = cmd;
1704 #ifndef SUPPORT_TAGS
1705 hostdata->busy[cmd->target] |= (1 << cmd->lun);
1708 initialize_SCp(cmd);
1715 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1716 * unsigned char *phase, int *count, unsigned char **data)
1718 * Purpose : transfers data in given phase using polled I/O
1720 * Inputs : instance - instance of driver, *phase - pointer to
1721 * what phase is expected, *count - pointer to number of
1722 * bytes to transfer, **data - pointer to data pointer.
1724 * Returns : -1 when different phase is entered without transferring
1725 * maximum number of bytes, 0 if all bytes are transfered or exit
1728 * Also, *phase, *count, *data are modified in place.
1730 * XXX Note : handling for bus free may be useful.
1734 * Note : this code is not as quick as it could be, however it
1735 * IS 100% reliable, and for the actual data transfer where speed
1736 * counts, we will always do a pseudo DMA or DMA transfer.
1739 static int NCR5380_transfer_pio( struct Scsi_Host *instance,
1740 unsigned char *phase, int *count,
1741 unsigned char **data)
1743 register unsigned char p = *phase, tmp;
1744 register int c = *count;
1745 register unsigned char *d = *data;
1748 * The NCR5380 chip will only drive the SCSI bus when the
1749 * phase specified in the appropriate bits of the TARGET COMMAND
1750 * REGISTER match the STATUS REGISTER
1753 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1757 * Wait for assertion of REQ, after which the phase bits will be
1760 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
1762 HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
1764 /* Check for phase mismatch */
1765 if ((tmp & PHASE_MASK) != p) {
1766 PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
1767 NCR_PRINT_PHASE(NDEBUG_PIO);
1771 /* Do actual transfer from SCSI bus to / from memory */
1773 NCR5380_write(OUTPUT_DATA_REG, *d);
1775 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1780 * The SCSI standard suggests that in MSGOUT phase, the initiator
1781 * should drop ATN on the last byte of the message phase
1782 * after REQ has been asserted for the handshake but before
1783 * the initiator raises ACK.
1787 if (!((p & SR_MSG) && c > 1)) {
1788 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1790 NCR_PRINT(NDEBUG_PIO);
1791 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1792 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1794 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1795 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1796 NCR_PRINT(NDEBUG_PIO);
1797 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1798 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1801 NCR_PRINT(NDEBUG_PIO);
1802 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1805 while (NCR5380_read(STATUS_REG) & SR_REQ);
1807 HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
1810 * We have several special cases to consider during REQ/ACK handshaking :
1811 * 1. We were in MSGOUT phase, and we are on the last byte of the
1812 * message. ATN must be dropped as ACK is dropped.
1814 * 2. We are in a MSGIN phase, and we are on the last byte of the
1815 * message. We must exit with ACK asserted, so that the calling
1816 * code may raise ATN before dropping ACK to reject the message.
1818 * 3. ACK and ATN are clear and the target may proceed as normal.
1820 if (!(p == PHASE_MSGIN && c == 1)) {
1821 if (p == PHASE_MSGOUT && c > 1)
1822 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1824 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1828 PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
1832 tmp = NCR5380_read(STATUS_REG);
1833 /* The phase read from the bus is valid if either REQ is (already)
1834 * asserted or if ACK hasn't been released yet. The latter is the case if
1835 * we're in MSGIN and all wanted bytes have been received. */
1836 if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
1837 *phase = tmp & PHASE_MASK;
1839 *phase = PHASE_UNKNOWN;
1841 if (!c || (*phase == p))
1848 * Function : do_abort (Scsi_Host *host)
1850 * Purpose : abort the currently established nexus. Should only be
1851 * called from a routine which can drop into a
1853 * Returns : 0 on success, -1 on failure.
1856 static int do_abort (struct Scsi_Host *host)
1858 unsigned char tmp, *msgptr, phase;
1861 /* Request message out phase */
1862 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1865 * Wait for the target to indicate a valid phase by asserting
1866 * REQ. Once this happens, we'll have either a MSGOUT phase
1867 * and can immediately send the ABORT message, or we'll have some
1868 * other phase and will have to source/sink data.
1870 * We really don't care what value was on the bus or what value
1871 * the target sees, so we just handshake.
1874 while (!(tmp = NCR5380_read(STATUS_REG)) & SR_REQ);
1876 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1878 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1879 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1881 while (NCR5380_read(STATUS_REG) & SR_REQ);
1882 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1888 phase = PHASE_MSGOUT;
1889 NCR5380_transfer_pio (host, &phase, &len, &msgptr);
1892 * If we got here, and the command completed successfully,
1893 * we're about to go into bus free state.
1896 return len ? -1 : 0;
1899 #if defined(REAL_DMA)
1901 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1902 * unsigned char *phase, int *count, unsigned char **data)
1904 * Purpose : transfers data in given phase using either real
1907 * Inputs : instance - instance of driver, *phase - pointer to
1908 * what phase is expected, *count - pointer to number of
1909 * bytes to transfer, **data - pointer to data pointer.
1911 * Returns : -1 when different phase is entered without transferring
1912 * maximum number of bytes, 0 if all bytes or transfered or exit
1915 * Also, *phase, *count, *data are modified in place.
1920 static int NCR5380_transfer_dma( struct Scsi_Host *instance,
1921 unsigned char *phase, int *count,
1922 unsigned char **data)
1924 SETUP_HOSTDATA(instance);
1925 register int c = *count;
1926 register unsigned char p = *phase;
1927 register unsigned char *d = *data;
1929 unsigned long flags;
1931 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1936 if (atari_read_overruns && (p & SR_IO)) {
1937 c -= atari_read_overruns;
1940 DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1941 HOSTNO, (p & SR_IO) ? "reading" : "writing",
1942 c, (p & SR_IO) ? "to" : "from", d);
1944 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1947 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
1948 #endif /* def REAL_DMA */
1951 /* On the Medusa, it is a must to initialize the DMA before
1952 * starting the NCR. This is also the cleaner way for the TT.
1956 hostdata->dma_len = (p & SR_IO) ?
1957 NCR5380_dma_read_setup(instance, d, c) :
1958 NCR5380_dma_write_setup(instance, d, c);
1959 restore_flags(flags);
1963 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1965 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1966 NCR5380_write(START_DMA_SEND_REG, 0);
1970 /* On the Falcon, the DMA setup must be done after the last */
1971 /* NCR access, else the DMA setup gets trashed!
1975 hostdata->dma_len = (p & SR_IO) ?
1976 NCR5380_dma_read_setup(instance, d, c) :
1977 NCR5380_dma_write_setup(instance, d, c);
1978 restore_flags(flags);
1982 #endif /* defined(REAL_DMA) */
1985 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1987 * Purpose : run through the various SCSI phases and do as the target
1988 * directs us to. Operates on the currently connected command,
1989 * instance->connected.
1991 * Inputs : instance, instance for which we are doing commands
1993 * Side effects : SCSI things happen, the disconnected queue will be
1994 * modified if a command disconnects, *instance->connected will
1997 * XXX Note : we need to watch for bus free or a reset condition here
1998 * to recover from an unexpected bus free condition.
2001 static void NCR5380_information_transfer (struct Scsi_Host *instance)
2003 SETUP_HOSTDATA(instance);
2004 unsigned long flags;
2005 unsigned char msgout = NOP;
2008 #if defined(REAL_DMA)
2011 unsigned char *data;
2012 unsigned char phase, tmp, extended_msg[10], old_phase=0xff;
2013 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
2016 tmp = NCR5380_read(STATUS_REG);
2017 /* We only have a valid SCSI phase when REQ is asserted */
2019 phase = (tmp & PHASE_MASK);
2020 if (phase != old_phase) {
2022 NCR_PRINT_PHASE(NDEBUG_INFORMATION);
2025 if (sink && (phase != PHASE_MSGOUT)) {
2026 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2028 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
2030 while (NCR5380_read(STATUS_REG) & SR_REQ);
2031 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2039 #if (NDEBUG & NDEBUG_NO_DATAOUT)
2040 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2041 "aborted\n", HOSTNO);
2044 cmd->result = DID_ERROR << 16;
2050 * If there is no room left in the current buffer in the
2051 * scatter-gather list, move onto the next one.
2054 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2056 --cmd->SCp.buffers_residual;
2057 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2058 cmd->SCp.ptr = cmd->SCp.buffer->address;
2059 /* ++roman: Try to merge some scatter-buffers if
2060 * they are at contiguous physical addresses.
2062 merge_contiguous_buffers( cmd );
2063 INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
2064 HOSTNO, cmd->SCp.this_residual,
2065 cmd->SCp.buffers_residual);
2069 * The preferred transfer method is going to be
2070 * PSEUDO-DMA for systems that are strictly PIO,
2071 * since we can let the hardware do the handshaking.
2073 * For this to work, we need to know the transfersize
2074 * ahead of time, since the pseudo-DMA code will sit
2075 * in an unconditional loop.
2078 /* ++roman: I suggest, this should be
2080 * instead of leaving REAL_DMA out.
2083 #if defined(REAL_DMA)
2084 if (!cmd->device->borken &&
2085 (transfersize = NCR5380_dma_xfer_len(instance,cmd,phase)) > 31) {
2087 cmd->SCp.phase = phase;
2088 if (NCR5380_transfer_dma(instance, &phase,
2089 &len, (unsigned char **) &cmd->SCp.ptr)) {
2091 * If the watchdog timer fires, all future
2092 * accesses to this device will use the
2094 printk(KERN_NOTICE "scsi%d: switching target %d "
2095 "lun %d to slow handshake\n", HOSTNO,
2096 cmd->target, cmd->lun);
2097 cmd->device->borken = 1;
2098 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2102 cmd->result = DID_ERROR << 16;
2104 /* XXX - need to source or sink data here, as appropriate */
2107 /* ++roman: When using real DMA,
2108 * information_transfer() should return after
2109 * starting DMA since it has nothing more to
2114 cmd->SCp.this_residual -= transfersize - len;
2118 #endif /* defined(REAL_DMA) */
2119 NCR5380_transfer_pio(instance, &phase,
2120 (int *) &cmd->SCp.this_residual, (unsigned char **)
2126 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
2127 NCR5380_transfer_pio(instance, &phase, &len, &data);
2128 cmd->SCp.Message = tmp;
2132 * Linking lets us reduce the time required to get the
2133 * next command out to the device, hopefully this will
2134 * mean we don't waste another revolution due to the delays
2135 * required by ARBITRATION and another SELECTION.
2137 * In the current implementation proposal, low level drivers
2138 * merely have to start the next command, pointed to by
2139 * next_link, done() is called as with unlinked commands.
2142 case LINKED_CMD_COMPLETE:
2143 case LINKED_FLG_CMD_COMPLETE:
2144 /* Accept message by clearing ACK */
2145 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2147 LNK_PRINTK("scsi%d: target %d lun %d linked command "
2148 "complete.\n", HOSTNO, cmd->target, cmd->lun);
2150 /* Enable reselect interrupts */
2151 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2153 * Sanity check : A linked command should only terminate
2154 * with one of these messages if there are more linked
2155 * commands available.
2158 if (!cmd->next_link) {
2159 printk(KERN_NOTICE "scsi%d: target %d lun %d "
2160 "linked command complete, no next_link\n",
2161 HOSTNO, cmd->target, cmd->lun);
2163 do_abort (instance);
2167 initialize_SCp(cmd->next_link);
2168 /* The next command is still part of this process; copy it
2169 * and don't free it! */
2170 cmd->next_link->tag = cmd->tag;
2171 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2172 LNK_PRINTK("scsi%d: target %d lun %d linked request "
2173 "done, calling scsi_done().\n",
2174 HOSTNO, cmd->target, cmd->lun);
2175 #ifdef NCR5380_STATS
2176 collect_stats(hostdata, cmd);
2178 cmd->scsi_done(cmd);
2179 cmd = hostdata->connected;
2181 #endif /* def LINKED */
2183 case COMMAND_COMPLETE:
2184 /* Accept message by clearing ACK */
2185 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2186 /* ++guenther: possible race with Falcon locking */
2187 falcon_dont_release++;
2188 hostdata->connected = NULL;
2189 QU_PRINTK("scsi%d: command for target %d, lun %d "
2190 "completed\n", HOSTNO, cmd->target, cmd->lun);
2192 cmd_free_tag( cmd );
2193 if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
2194 /* Turn a QUEUE FULL status into BUSY, I think the
2195 * mid level cannot handle QUEUE FULL :-( (The
2196 * command is retried after BUSY). Also update our
2197 * queue size to the number of currently issued
2200 /* ++Andreas: the mid level code knows about
2202 TAG_ALLOC *ta = &TagAlloc[cmd->target][cmd->lun];
2203 TAG_PRINTK("scsi%d: target %d lun %d returned "
2204 "QUEUE_FULL after %d commands\n",
2205 HOSTNO, cmd->target, cmd->lun,
2207 if (ta->queue_size > ta->nr_allocated)
2208 ta->nr_allocated = ta->queue_size;
2211 hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
2213 /* Enable reselect interrupts */
2214 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2217 * I'm not sure what the correct thing to do here is :
2219 * If the command that just executed is NOT a request
2220 * sense, the obvious thing to do is to set the result
2221 * code to the values of the stored parameters.
2223 * If it was a REQUEST SENSE command, we need some way to
2224 * differentiate between the failure code of the original
2225 * and the failure code of the REQUEST sense - the obvious
2226 * case is success, where we fall through and leave the
2227 * result code unchanged.
2229 * The non-obvious place is where the REQUEST SENSE failed
2232 if (cmd->cmnd[0] != REQUEST_SENSE)
2233 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2234 else if (status_byte(cmd->SCp.Status) != GOOD)
2235 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2238 if ((cmd->cmnd[0] != REQUEST_SENSE) &&
2239 (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2240 ASEN_PRINTK("scsi%d: performing request sense\n",
2242 cmd->cmnd[0] = REQUEST_SENSE;
2243 cmd->cmnd[1] &= 0xe0;
2246 cmd->cmnd[4] = sizeof(cmd->sense_buffer);
2248 cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]);
2251 /* this is initialized from initialize_SCp
2252 cmd->SCp.buffer = NULL;
2253 cmd->SCp.buffers_residual = 0;
2255 cmd->request_buffer = (char *) cmd->sense_buffer;
2256 cmd->request_bufflen = sizeof(cmd->sense_buffer);
2260 LIST(cmd,hostdata->issue_queue);
2261 NEXT(cmd) = hostdata->issue_queue;
2262 hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2263 restore_flags(flags);
2264 QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
2265 "issue queue\n", H_NO(cmd));
2267 #endif /* def AUTOSENSE */
2269 #ifdef NCR5380_STATS
2270 collect_stats(hostdata, cmd);
2272 cmd->scsi_done(cmd);
2275 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2277 * Restore phase bits to 0 so an interrupted selection,
2278 * arbitration can resume.
2280 NCR5380_write(TARGET_COMMAND_REG, 0);
2282 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2285 falcon_dont_release--;
2286 /* ++roman: For Falcon SCSI, release the lock on the
2287 * ST-DMA here if no other commands are waiting on the
2288 * disconnected queue.
2290 falcon_release_lock_if_possible( hostdata );
2292 case MESSAGE_REJECT:
2293 /* Accept message by clearing ACK */
2294 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2295 /* Enable reselect interrupts */
2296 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2297 switch (hostdata->last_message) {
2298 case HEAD_OF_QUEUE_TAG:
2299 case ORDERED_QUEUE_TAG:
2300 case SIMPLE_QUEUE_TAG:
2301 /* The target obviously doesn't support tagged
2302 * queuing, even though it announced this ability in
2303 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2304 * clear 'tagged_supported' and lock the LUN, since
2305 * the command is treated as untagged further on.
2307 cmd->device->tagged_supported = 0;
2308 hostdata->busy[cmd->target] |= (1 << cmd->lun);
2309 cmd->tag = TAG_NONE;
2310 TAG_PRINTK("scsi%d: target %d lun %d rejected "
2311 "QUEUE_TAG message; tagged queuing "
2313 HOSTNO, cmd->target, cmd->lun);
2318 /* Accept message by clearing ACK */
2319 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2322 cmd->device->disconnect = 1;
2323 LIST(cmd,hostdata->disconnected_queue);
2324 NEXT(cmd) = hostdata->disconnected_queue;
2325 hostdata->connected = NULL;
2326 hostdata->disconnected_queue = cmd;
2327 restore_flags(flags);
2328 QU_PRINTK("scsi%d: command for target %d lun %d was "
2329 "moved from connected to the "
2330 "disconnected_queue\n", HOSTNO,
2331 cmd->target, cmd->lun);
2333 * Restore phase bits to 0 so an interrupted selection,
2334 * arbitration can resume.
2336 NCR5380_write(TARGET_COMMAND_REG, 0);
2338 /* Enable reselect interrupts */
2339 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2340 /* Wait for bus free to avoid nasty timeouts */
2341 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2345 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2346 * operation, in violation of the SCSI spec so we can safely
2347 * ignore SAVE/RESTORE pointers calls.
2349 * Unfortunately, some disks violate the SCSI spec and
2350 * don't issue the required SAVE_POINTERS message before
2351 * disconnecting, and we have to break spec to remain
2355 case RESTORE_POINTERS:
2356 /* Accept message by clearing ACK */
2357 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2358 /* Enable reselect interrupts */
2359 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2361 case EXTENDED_MESSAGE:
2363 * Extended messages are sent in the following format :
2365 * 0 EXTENDED_MESSAGE == 1
2366 * 1 length (includes one byte for code, doesn't
2367 * include first two bytes)
2369 * 3..length+1 arguments
2371 * Start the extended message buffer with the EXTENDED_MESSAGE
2372 * byte, since print_msg() wants the whole thing.
2374 extended_msg[0] = EXTENDED_MESSAGE;
2375 /* Accept first byte by clearing ACK */
2376 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2378 EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
2381 data = extended_msg + 1;
2382 phase = PHASE_MSGIN;
2383 NCR5380_transfer_pio(instance, &phase, &len, &data);
2384 EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2385 (int)extended_msg[1], (int)extended_msg[2]);
2387 if (!len && extended_msg[1] <=
2388 (sizeof (extended_msg) - 1)) {
2389 /* Accept third byte by clearing ACK */
2390 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2391 len = extended_msg[1] - 1;
2392 data = extended_msg + 3;
2393 phase = PHASE_MSGIN;
2395 NCR5380_transfer_pio(instance, &phase, &len, &data);
2396 EXT_PRINTK("scsi%d: message received, residual %d\n",
2399 switch (extended_msg[2]) {
2402 case EXTENDED_MODIFY_DATA_POINTER:
2403 case EXTENDED_EXTENDED_IDENTIFY:
2407 printk(KERN_NOTICE "scsi%d: error receiving "
2408 "extended message\n", HOSTNO);
2411 printk(KERN_NOTICE "scsi%d: extended message "
2412 "code %02x length %d is too long\n",
2413 HOSTNO, extended_msg[2], extended_msg[1]);
2416 /* Fall through to reject message */
2419 * If we get something weird that we aren't expecting,
2424 printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
2425 print_msg (extended_msg);
2427 } else if (tmp != EXTENDED_MESSAGE)
2428 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2429 "message %02x from target %d, lun %d\n",
2430 HOSTNO, tmp, cmd->target, cmd->lun);
2432 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2434 "code %02x, length %d from target %d, lun %d\n",
2435 HOSTNO, extended_msg[1], extended_msg[0],
2436 cmd->target, cmd->lun);
2439 msgout = MESSAGE_REJECT;
2440 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2443 } /* switch (tmp) */
2448 hostdata->last_message = msgout;
2449 NCR5380_transfer_pio(instance, &phase, &len, &data);
2450 if (msgout == ABORT) {
2452 cmd_free_tag( cmd );
2454 hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
2456 hostdata->connected = NULL;
2457 cmd->result = DID_ERROR << 16;
2458 #ifdef NCR5380_STATS
2459 collect_stats(hostdata, cmd);
2461 cmd->scsi_done(cmd);
2462 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2463 falcon_release_lock_if_possible( hostdata );
2472 * XXX for performance reasons, on machines with a
2473 * PSEUDO-DMA architecture we should probably
2474 * use the dma transfer function.
2476 NCR5380_transfer_pio(instance, &phase, &len,
2482 NCR5380_transfer_pio(instance, &phase, &len, &data);
2483 cmd->SCp.Status = tmp;
2486 printk("scsi%d: unknown phase\n", HOSTNO);
2487 NCR_PRINT(NDEBUG_ANY);
2488 } /* switch(phase) */
2489 } /* if (tmp * SR_REQ) */
2494 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2496 * Purpose : does reselection, initializing the instance->connected
2497 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2498 * nexus has been reestablished,
2500 * Inputs : instance - this instance of the NCR5380.
2505 static void NCR5380_reselect (struct Scsi_Host *instance)
2507 SETUP_HOSTDATA(instance);
2508 unsigned char target_mask;
2509 unsigned char lun, phase;
2514 unsigned char msg[3];
2515 unsigned char *data;
2516 Scsi_Cmnd *tmp = NULL, *prev;
2517 /* unsigned long flags; */
2520 * Disable arbitration, etc. since the host adapter obviously
2521 * lost, and tell an interrupted NCR5380_select() to restart.
2524 NCR5380_write(MODE_REG, MR_BASE);
2525 hostdata->restart_select = 1;
2527 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2529 RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
2532 * At this point, we have detected that our SCSI ID is on the bus,
2533 * SEL is true and BSY was false for at least one bus settle delay
2536 * We must assert BSY ourselves, until the target drops the SEL
2540 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2542 while (NCR5380_read(STATUS_REG) & SR_SEL);
2543 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2546 * Wait for target to go into MSGIN.
2549 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
2553 phase = PHASE_MSGIN;
2554 NCR5380_transfer_pio(instance, &phase, &len, &data);
2556 if (!msg[0] & 0x80) {
2557 printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
2562 lun = (msg[0] & 0x07);
2565 /* If the phase is still MSGIN, the target wants to send some more
2566 * messages. In case it supports tagged queuing, this is probably a
2567 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2570 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2571 /* Accept previous IDENTIFY message by clearing ACK */
2572 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2575 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2576 msg[1] == SIMPLE_QUEUE_TAG)
2578 TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
2579 "reselection\n", HOSTNO, target_mask, lun, tag);
2584 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2585 * just reestablished, and remove it from the disconnected queue.
2588 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL;
2589 tmp; prev = tmp, tmp = NEXT(tmp) ) {
2590 if ((target_mask == (1 << tmp->target)) && (lun == tmp->lun)
2592 && (tag == tmp->tag)
2595 /* ++guenther: prevent race with falcon_release_lock */
2596 falcon_dont_release++;
2598 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
2599 NEXT(prev) = NEXT(tmp);
2601 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2602 hostdata->disconnected_queue = NEXT(tmp);
2610 printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
2614 "not in disconnected_queue.\n",
2615 HOSTNO, target_mask, lun
2621 * Since we have an established nexus that we can't do anything
2622 * with, we must abort it.
2628 /* Accept message by clearing ACK */
2629 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2631 hostdata->connected = tmp;
2632 RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2633 HOSTNO, tmp->target, tmp->lun, tmp->tag);
2634 falcon_dont_release--;
2639 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2641 * Purpose : abort a command
2643 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2644 * host byte of the result field to, if zero DID_ABORTED is
2647 * Returns : 0 - success, -1 on failure.
2649 * XXX - there is no way to abort the command that is currently
2650 * connected, you have to wait for it to complete. If this is
2651 * a problem, we could implement longjmp() / setjmp(), setjmp()
2652 * called where the loop started in NCR5380_main().
2655 #ifndef NCR5380_abort
2658 int NCR5380_abort (Scsi_Cmnd *cmd)
2660 struct Scsi_Host *instance = cmd->host;
2661 SETUP_HOSTDATA(instance);
2662 Scsi_Cmnd *tmp, **prev;
2663 unsigned long flags;
2665 printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
2666 print_Scsi_Cmnd (cmd);
2668 NCR5380_print_status (instance);
2673 if (!IS_A_TT() && !falcon_got_lock)
2674 printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_abort\n",
2677 ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
2678 NCR5380_read(BUS_AND_STATUS_REG),
2679 NCR5380_read(STATUS_REG));
2683 * Case 1 : If the command is the currently executing command,
2684 * we'll set the aborted flag and return control so that
2685 * information transfer routine can exit cleanly.
2688 if (hostdata->connected == cmd) {
2690 ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO);
2692 * We should perform BSY checking, and make sure we haven't slipped
2696 /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2698 * Since we can't change phases until we've completed the current
2699 * handshake, we have to source or sink a byte of data if the current
2700 * phase is not MSGOUT.
2704 * Return control to the executing NCR drive so we can clear the
2705 * aborted flag and get back into our main loop.
2708 if (do_abort(instance) == 0) {
2709 hostdata->aborted = 1;
2710 hostdata->connected = NULL;
2711 cmd->result = DID_ABORT << 16;
2713 cmd_free_tag( cmd );
2715 hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
2717 restore_flags(flags);
2718 cmd->scsi_done(cmd);
2719 falcon_release_lock_if_possible( hostdata );
2720 return SCSI_ABORT_SUCCESS;
2722 /* restore_flags(flags); */
2723 printk("scsi%d: abort of connected command failed!\n", HOSTNO);
2724 return SCSI_ABORT_ERROR;
2730 * Case 2 : If the command hasn't been issued yet, we simply remove it
2731 * from the issue queue.
2733 for (prev = (Scsi_Cmnd **) &(hostdata->issue_queue),
2734 tmp = (Scsi_Cmnd *) hostdata->issue_queue;
2735 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
2737 REMOVE(5, *prev, tmp, NEXT(tmp));
2738 (*prev) = NEXT(tmp);
2740 tmp->result = DID_ABORT << 16;
2741 restore_flags(flags);
2742 ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
2744 /* Tagged queuing note: no tag to free here, hasn't been assigned
2746 tmp->scsi_done(tmp);
2747 falcon_release_lock_if_possible( hostdata );
2748 return SCSI_ABORT_SUCCESS;
2752 * Case 3 : If any commands are connected, we're going to fail the abort
2753 * and let the high level SCSI driver retry at a later time or
2756 * Timeouts, and therefore aborted commands, will be highly unlikely
2757 * and handling them cleanly in this situation would make the common
2758 * case of noresets less efficient, and would pollute our code. So,
2762 if (hostdata->connected) {
2763 restore_flags(flags);
2764 ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
2765 return SCSI_ABORT_SNOOZE;
2769 * Case 4: If the command is currently disconnected from the bus, and
2770 * there are no connected commands, we reconnect the I_T_L or
2771 * I_T_L_Q nexus associated with it, go into message out, and send
2774 * This case is especially ugly. In order to reestablish the nexus, we
2775 * need to call NCR5380_select(). The easiest way to implement this
2776 * function was to abort if the bus was busy, and let the interrupt
2777 * handler triggered on the SEL for reselect take care of lost arbitrations
2778 * where necessary, meaning interrupts need to be enabled.
2780 * When interrupts are enabled, the queues may change - so we
2781 * can't remove it from the disconnected queue before selecting it
2782 * because that could cause a failure in hashing the nexus if that
2783 * device reselected.
2785 * Since the queues may change, we can't use the pointers from when we
2788 * So, we must first locate the command, and if NCR5380_select()
2789 * succeeds, then issue the abort, relocate the command and remove
2790 * it from the disconnected queue.
2793 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp;
2796 restore_flags(flags);
2797 ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
2799 if (NCR5380_select (instance, cmd, (int) cmd->tag))
2800 return SCSI_ABORT_BUSY;
2802 ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
2804 do_abort (instance);
2808 for (prev = (Scsi_Cmnd **) &(hostdata->disconnected_queue),
2809 tmp = (Scsi_Cmnd *) hostdata->disconnected_queue;
2810 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
2812 REMOVE(5, *prev, tmp, NEXT(tmp));
2815 tmp->result = DID_ABORT << 16;
2816 /* We must unlock the tag/LUN immediately here, since the
2817 * target goes to BUS FREE and doesn't send us another
2818 * message (COMMAND_COMPLETE or the like)
2821 cmd_free_tag( tmp );
2823 hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
2825 restore_flags(flags);
2826 tmp->scsi_done(tmp);
2827 falcon_release_lock_if_possible( hostdata );
2828 return SCSI_ABORT_SUCCESS;
2833 * Case 5 : If we reached this point, the command was not found in any of
2836 * We probably reached this point because of an unlikely race condition
2837 * between the command completing successfully and the abortion code,
2838 * so we won't panic, but we will notify the user in case something really
2842 restore_flags(flags);
2843 printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully\n"
2844 KERN_INFO " before abortion\n", HOSTNO);
2846 /* Maybe it is sufficient just to release the ST-DMA lock... (if
2847 * possible at all) At least, we should check if the lock could be
2848 * released after the abort, in case it is kept due to some bug.
2850 falcon_release_lock_if_possible( hostdata );
2852 return SCSI_ABORT_NOT_RUNNING;
2857 * Function : int NCR5380_reset (Scsi_Cmnd *cmd, unsigned int reset_flags)
2859 * Purpose : reset the SCSI bus.
2861 * Returns : SCSI_RESET_WAKEUP
2865 static int NCR5380_reset( Scsi_Cmnd *cmd, unsigned int reset_flags)
2867 SETUP_HOSTDATA(cmd->host);
2869 unsigned long flags;
2871 Scsi_Cmnd *connected, *disconnected_queue;
2874 if (!IS_A_TT() && !falcon_got_lock)
2875 printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_reset\n",
2878 NCR5380_print_status (cmd->host);
2881 NCR5380_write( TARGET_COMMAND_REG,
2882 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
2884 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
2886 /* reset NCR registers */
2887 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2888 NCR5380_write( MODE_REG, MR_BASE );
2889 NCR5380_write( TARGET_COMMAND_REG, 0 );
2890 NCR5380_write( SELECT_ENABLE_REG, 0 );
2891 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2892 * through anymore ... */
2893 (void)NCR5380_read( RESET_PARITY_INTERRUPT_REG );
2895 #if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
2896 /* XXX see below XXX */
2898 /* MSch: old-style reset: actually abort all command processing here */
2900 /* After the reset, there are no more connected or disconnected commands
2901 * and no busy units; to avoid problems with re-inserting the commands
2902 * into the issue_queue (via scsi_done()), the aborted commands are
2903 * remembered in local variables first.
2907 connected = (Scsi_Cmnd *)hostdata->connected;
2908 hostdata->connected = NULL;
2909 disconnected_queue = (Scsi_Cmnd *)hostdata->disconnected_queue;
2910 hostdata->disconnected_queue = NULL;
2914 for( i = 0; i < 8; ++i )
2915 hostdata->busy[i] = 0;
2917 hostdata->dma_len = 0;
2919 restore_flags(flags);
2921 /* In order to tell the mid-level code which commands were aborted,
2922 * set the command status to DID_RESET and call scsi_done() !!!
2923 * This ultimately aborts processing of these commands in the mid-level.
2926 if ((cmd = connected)) {
2927 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2928 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2929 cmd->scsi_done( cmd );
2932 for (i = 0; (cmd = disconnected_queue); ++i) {
2933 disconnected_queue = NEXT(cmd);
2935 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2936 cmd->scsi_done( cmd );
2939 ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
2941 /* The Falcon lock should be released after a reset...
2943 /* ++guenther: moved to atari_scsi_reset(), to prevent a race between
2944 * unlocking and enabling dma interrupt.
2946 /* falcon_release_lock_if_possible( hostdata );*/
2948 /* since all commands have been explicitly terminated, we need to tell
2949 * the midlevel code that the reset was SUCCESSFUL, and there is no
2950 * need to 'wake up' the commands by a request_sense
2952 return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
2955 /* MSch: new-style reset handling: let the mid-level do what it can */
2957 /* ++guenther: MID-LEVEL IS STILL BROKEN.
2958 * Mid-level is supposed to requeue all commands that were active on the
2959 * various low-level queues. In fact it does this, but that's not enough
2960 * because all these commands are subject to timeout. And if a timeout
2961 * happens for any removed command, *_abort() is called but all queues
2962 * are now empty. Abort then gives up the falcon lock, which is fatal,
2963 * since the mid-level will queue more commands and must have the lock
2964 * (it's all happening inside timer interrupt handler!!).
2965 * Even worse, abort will return NOT_RUNNING for all those commands not
2966 * on any queue, so they won't be retried ...
2968 * Conclusion: either scsi.c disables timeout for all resetted commands
2969 * immediately, or we loose! As of linux-2.0.20 it doesn't.
2972 /* After the reset, there are no more connected or disconnected commands
2973 * and no busy units; so clear the low-level status here to avoid
2974 * conflicts when the mid-level code tries to wake up the affected
2978 if (hostdata->issue_queue)
2979 ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
2980 if (hostdata->connected)
2981 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2982 if (hostdata->disconnected_queue)
2983 ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
2987 hostdata->issue_queue = NULL;
2988 hostdata->connected = NULL;
2989 hostdata->disconnected_queue = NULL;
2993 for( i = 0; i < 8; ++i )
2994 hostdata->busy[i] = 0;
2996 hostdata->dma_len = 0;
2998 restore_flags(flags);
3000 /* we did no complete reset of all commands, so a wakeup is required */
3001 return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;
3005 /* Local Variables: */