1 /* sun3_NCR5380.c -- adapted from atari_NCR5380.c for the sun3 by
4 * NCR 5380 generic driver routines. These should make it *trivial*
5 * to implement 5380 SCSI drivers under Linux with a non-trantor
8 * Note that these routines also work with NR53c400 family chips.
10 * Copyright 1993, Drew Eckhardt
12 * (Unix and Linux consulting and custom programming)
16 * DISTRIBUTION RELEASE 6.
18 * For more information, please consult
21 * SCSI Protocol Controller
24 * NCR Microelectronics
25 * 1635 Aeroplaza Drive
26 * Colorado Springs, CO 80916
32 * ++roman: To port the 5380 driver to the Atari, I had to do some changes in
35 * - Some of the debug statements were incorrect (undefined variables and the
36 * like). I fixed that.
38 * - In information_transfer(), I think a #ifdef was wrong. Looking at the
39 * possible DMA transfer size should also happen for REAL_DMA. I added this
40 * in the #if statement.
42 * - When using real DMA, information_transfer() should return in a DATAOUT
43 * phase after starting the DMA. It has nothing more to do.
45 * - The interrupt service routine should run main after end of DMA, too (not
46 * only after RESELECTION interrupts). Additionally, it should _not_ test
47 * for more interrupts after running main, since a DMA process may have
48 * been started and interrupts are turned on now. The new int could happen
49 * inside the execution of NCR5380_intr(), leading to recursive
52 * - I've added a function merge_contiguous_buffers() that tries to
53 * merge scatter-gather buffers that are located at contiguous
54 * physical addresses and can be processed with the same DMA setup.
55 * Since most scatter-gather operations work on a page (4K) of
56 * 4 buffers (1K), in more than 90% of all cases three interrupts and
57 * DMA setup actions are saved.
59 * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA
60 * and USLEEP, because these were messing up readability and will never be
61 * needed for Atari SCSI.
63 * - I've revised the NCR5380_main() calling scheme (relax the 'main_running'
64 * stuff), and 'main' is executed in a bottom half if awoken by an
67 * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..."
68 * constructs. In my eyes, this made the source rather unreadable, so I
69 * finally replaced that by the *_PRINTK() macros.
72 #include <scsi/scsi_dbg.h>
73 #include <scsi/scsi_transport_spi.h>
76 * Further development / testing that should be done :
77 * 1. Test linked command handling code after Eric is ready with
78 * the high level code.
81 #if (NDEBUG & NDEBUG_LISTS)
83 { printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); \
84 if ((x)==(y)) udelay(5); }
85 #define REMOVE(w,x,y,z) \
86 { printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, \
87 (void*)(w), (void*)(x), (void*)(y), (void*)(z)); \
88 if ((x)==(y)) udelay(5); }
91 #define REMOVE(w,x,y,z)
102 * The other Linux SCSI drivers were written when Linux was Intel PC-only,
103 * and specifically for each board rather than each chip. This makes their
104 * adaptation to platforms like the Mac (Some of which use NCR5380's)
105 * more difficult than it has to be.
107 * Also, many of the SCSI drivers were written before the command queuing
108 * routines were implemented, meaning their implementations of queued
109 * commands were hacked on rather than designed in from the start.
111 * When I designed the Linux SCSI drivers I figured that
112 * while having two different SCSI boards in a system might be useful
113 * for debugging things, two of the same type wouldn't be used.
114 * Well, I was wrong and a number of users have mailed me about running
115 * multiple high-performance SCSI boards in a server.
117 * Finally, when I get questions from users, I have no idea what
118 * revision of my driver they are running.
120 * This driver attempts to address these problems :
121 * This is a generic 5380 driver. To use it on a different platform,
122 * one simply writes appropriate system specific macros (ie, data
123 * transfer - some PC's will use the I/O bus, 68K's must use
124 * memory mapped) and drops this file in their 'C' wrapper.
126 * As far as command queueing, two queues are maintained for
127 * each 5380 in the system - commands that haven't been issued yet,
128 * and commands that are currently executing. This means that an
129 * unlimited number of commands may be queued, letting
130 * more commands propagate from the higher driver levels giving higher
131 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
132 * allowing multiple commands to propagate all the way to a SCSI-II device
133 * while a command is already executing.
135 * To solve the multiple-boards-in-the-same-system problem,
136 * there is a separate instance structure for each instance
137 * of a 5380 in the system. So, multiple NCR5380 drivers will
138 * be able to coexist with appropriate changes to the high level
141 * A NCR5380_PUBLIC_REVISION macro is provided, with the release
142 * number (updated for each public release) printed by the
143 * NCR5380_print_options command, which should be called from the
144 * wrapper detect function, so that I know what release of the driver
147 * Issues specific to the NCR5380 :
149 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
150 * piece of hardware that requires you to sit in a loop polling for
151 * the REQ signal as long as you are connected. Some devices are
152 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
153 * while doing long seek operations.
155 * The workaround for this is to keep track of devices that have
156 * disconnected. If the device hasn't disconnected, for commands that
157 * should disconnect, we do something like
159 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
161 * Some tweaking of N and M needs to be done. An algorithm based
162 * on "time to data" would give the best results as long as short time
163 * to datas (ie, on the same track) were considered, however these
164 * broken devices are the exception rather than the rule and I'd rather
165 * spend my time optimizing for the normal case.
169 * At the heart of the design is a coroutine, NCR5380_main,
170 * which is started when not running by the interrupt handler,
171 * timer, and queue command function. It attempts to establish
172 * I_T_L or I_T_L_Q nexuses by removing the commands from the
173 * issue queue and calling NCR5380_select() if a nexus
174 * is not established.
176 * Once a nexus is established, the NCR5380_information_transfer()
177 * phase goes through the various phases as instructed by the target.
178 * if the target goes into MSG IN and sends a DISCONNECT message,
179 * the command structure is placed into the per instance disconnected
180 * queue, and NCR5380_main tries to find more work. If USLEEP
181 * was defined, and the target is idle for too long, the system
184 * If a command has disconnected, eventually an interrupt will trigger,
185 * calling NCR5380_intr() which will in turn call NCR5380_reselect
186 * to reestablish a nexus. This will run main if necessary.
188 * On command termination, the done function will be called as
191 * SCSI pointers are maintained in the SCp field of SCSI command
192 * structures, being initialized after the command is connected
193 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
194 * Note that in violation of the standard, an implicit SAVE POINTERS operation
195 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
200 * This file a skeleton Linux SCSI driver for the NCR 5380 series
201 * of chips. To use it, you write an architecture specific functions
202 * and macros and include this file in your driver.
204 * These macros control options :
205 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
206 * for commands that return with a CHECK CONDITION status.
208 * LINKED - if defined, linked commands are supported.
210 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
212 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
214 * These macros MUST be defined :
216 * NCR5380_read(register) - read from the specified register
218 * NCR5380_write(register, value) - write to the specific register
220 * Either real DMA *or* pseudo DMA may be implemented
222 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
223 * Note that the DMA setup functions should return the number of bytes
224 * that they were able to program the controller for.
226 * Also note that generic i386/PC versions of these macros are
227 * available as NCR5380_i386_dma_write_setup,
228 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
230 * NCR5380_dma_write_setup(instance, src, count) - initialize
231 * NCR5380_dma_read_setup(instance, dst, count) - initialize
232 * NCR5380_dma_residual(instance); - residual count
235 * NCR5380_pwrite(instance, src, count)
236 * NCR5380_pread(instance, dst, count);
238 * If nothing specific to this implementation needs doing (ie, with external
239 * hardware), you must also define
241 * NCR5380_queue_command
246 * to be the global entry points into the specific driver, ie
247 * #define NCR5380_queue_command t128_queue_command.
249 * If this is not done, the routines will be defined as static functions
250 * with the NCR5380* names and the user must provide a globally
251 * accessible wrapper function.
253 * The generic driver is initialized by calling NCR5380_init(instance),
254 * after setting the appropriate host specific fields and ID. If the
255 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
256 * possible) function may be used. Before the specific driver initialization
257 * code finishes, NCR5380_print_options should be called.
260 static struct Scsi_Host *first_instance = NULL;
261 static struct scsi_host_template *the_template = NULL;
263 /* Macros ease life... :-) */
264 #define SETUP_HOSTDATA(in) \
265 struct NCR5380_hostdata *hostdata = \
266 (struct NCR5380_hostdata *)(in)->hostdata
267 #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
269 #define NEXT(cmd) ((struct scsi_cmnd *)(cmd)->host_scribble)
270 #define SET_NEXT(cmd, next) ((cmd)->host_scribble = (void *)(next))
271 #define NEXTADDR(cmd) ((struct scsi_cmnd **)&((cmd)->host_scribble))
273 #define HOSTNO instance->host_no
274 #define H_NO(cmd) (cmd)->device->host->host_no
276 #define SGADDR(buffer) (void *)(((unsigned long)sg_virt(((buffer)))))
281 * Functions for handling tagged queuing
282 * =====================================
284 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
286 * Using consecutive numbers for the tags is no good idea in my eyes. There
287 * could be wrong re-usings if the counter (8 bit!) wraps and some early
288 * command has been preempted for a long time. My solution: a bitfield for
289 * remembering used tags.
291 * There's also the problem that each target has a certain queue size, but we
292 * cannot know it in advance :-( We just see a QUEUE_FULL status being
293 * returned. So, in this case, the driver internal queue size assumption is
294 * reduced to the number of active tags if QUEUE_FULL is returned by the
295 * target. The command is returned to the mid-level, but with status changed
296 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
299 * We're also not allowed running tagged commands as long as an untagged
300 * command is active. And REQUEST SENSE commands after a contingent allegiance
301 * condition _must_ be untagged. To keep track whether an untagged command has
302 * been issued, the host->busy array is still employed, as it is without
303 * support for tagged queuing.
305 * One could suspect that there are possible race conditions between
306 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
307 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
308 * which already guaranteed to be running at most once. It is also the only
309 * place where tags/LUNs are allocated. So no other allocation can slip
310 * between that pair, there could only happen a reselection, which can free a
311 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
312 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
315 /* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
317 #define TAG_NONE 0xff
319 /* For the m68k, the number of bits in 'allocated' must be a multiple of 32! */
320 #if (MAX_TAGS % 32) != 0
321 #error "MAX_TAGS must be a multiple of 32!"
325 char allocated[MAX_TAGS/8];
330 static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */
333 static void __init init_tags( void )
338 if (!setup_use_tagged_queuing)
341 for( target = 0; target < 8; ++target ) {
342 for( lun = 0; lun < 8; ++lun ) {
343 ta = &TagAlloc[target][lun];
344 memset( &ta->allocated, 0, MAX_TAGS/8 );
345 ta->nr_allocated = 0;
346 /* At the beginning, assume the maximum queue size we could
347 * support (MAX_TAGS). This value will be decreased if the target
348 * returns QUEUE_FULL status.
350 ta->queue_size = MAX_TAGS;
356 /* Check if we can issue a command to this LUN: First see if the LUN is marked
357 * busy by an untagged command. If the command should use tagged queuing, also
358 * check that there is a free tag and the target's queue won't overflow. This
359 * function should be called with interrupts disabled to avoid race
363 static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged)
365 SETUP_HOSTDATA(cmd->device->host);
367 if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun))
369 if (!should_be_tagged ||
370 !setup_use_tagged_queuing || !cmd->device->tagged_supported)
372 if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >=
373 TagAlloc[cmd->device->id][cmd->device->lun].queue_size ) {
374 TAG_PRINTK( "scsi%d: target %d lun %d: no free tags\n",
375 H_NO(cmd), cmd->device->id, cmd->device->lun );
382 /* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
383 * must be called before!), or reserve the LUN in 'busy' if the command is
387 static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged)
389 SETUP_HOSTDATA(cmd->device->host);
391 /* If we or the target don't support tagged queuing, allocate the LUN for
392 * an untagged command.
394 if (!should_be_tagged ||
395 !setup_use_tagged_queuing || !cmd->device->tagged_supported) {
397 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
398 TAG_PRINTK( "scsi%d: target %d lun %d now allocated by untagged "
399 "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun );
402 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
404 cmd->tag = find_first_zero_bit( &ta->allocated, MAX_TAGS );
405 set_bit( cmd->tag, &ta->allocated );
407 TAG_PRINTK( "scsi%d: using tag %d for target %d lun %d "
408 "(now %d tags in use)\n",
409 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun,
415 /* Mark the tag of command 'cmd' as free, or in case of an untagged command,
419 static void cmd_free_tag(struct scsi_cmnd *cmd)
421 SETUP_HOSTDATA(cmd->device->host);
423 if (cmd->tag == TAG_NONE) {
424 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
425 TAG_PRINTK( "scsi%d: target %d lun %d untagged cmd finished\n",
426 H_NO(cmd), cmd->device->id, cmd->device->lun );
428 else if (cmd->tag >= MAX_TAGS) {
429 printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
430 H_NO(cmd), cmd->tag );
433 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
434 clear_bit( cmd->tag, &ta->allocated );
436 TAG_PRINTK( "scsi%d: freed tag %d for target %d lun %d\n",
437 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun );
442 static void free_all_tags( void )
447 if (!setup_use_tagged_queuing)
450 for( target = 0; target < 8; ++target ) {
451 for( lun = 0; lun < 8; ++lun ) {
452 ta = &TagAlloc[target][lun];
453 memset( &ta->allocated, 0, MAX_TAGS/8 );
454 ta->nr_allocated = 0;
459 #endif /* SUPPORT_TAGS */
463 * Function: void merge_contiguous_buffers(struct scsi_cmnd *cmd)
465 * Purpose: Try to merge several scatter-gather requests into one DMA
466 * transfer. This is possible if the scatter buffers lie on
467 * physical contiguous addresses.
469 * Parameters: struct scsi_cmnd *cmd
470 * The command to work on. The first scatter buffer's data are
471 * assumed to be already transferred into ptr/this_residual.
474 static void merge_contiguous_buffers(struct scsi_cmnd *cmd)
476 unsigned long endaddr;
477 #if (NDEBUG & NDEBUG_MERGING)
478 unsigned long oldlen = cmd->SCp.this_residual;
482 for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1;
483 cmd->SCp.buffers_residual &&
484 virt_to_phys(SGADDR(&(cmd->SCp.buffer[1]))) == endaddr; ) {
486 MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
487 SGADDR(&(cmd->SCp.buffer[1])), endaddr);
488 #if (NDEBUG & NDEBUG_MERGING)
492 --cmd->SCp.buffers_residual;
493 cmd->SCp.this_residual += cmd->SCp.buffer->length;
494 endaddr += cmd->SCp.buffer->length;
496 #if (NDEBUG & NDEBUG_MERGING)
497 if (oldlen != cmd->SCp.this_residual)
498 MER_PRINTK("merged %d buffers from %p, new length %08x\n",
499 cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
504 * Function : void initialize_SCp(struct scsi_cmnd *cmd)
506 * Purpose : initialize the saved data pointers for cmd to point to the
507 * start of the buffer.
509 * Inputs : cmd - struct scsi_cmnd structure to have pointers reset.
512 static __inline__ void initialize_SCp(struct scsi_cmnd *cmd)
515 * Initialize the Scsi Pointer field so that all of the commands in the
516 * various queues are valid.
519 if (scsi_bufflen(cmd)) {
520 cmd->SCp.buffer = scsi_sglist(cmd);
521 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
522 cmd->SCp.ptr = (char *) SGADDR(cmd->SCp.buffer);
523 cmd->SCp.this_residual = cmd->SCp.buffer->length;
525 /* ++roman: Try to merge some scatter-buffers if they are at
526 * contiguous physical addresses.
528 // merge_contiguous_buffers( cmd );
530 cmd->SCp.buffer = NULL;
531 cmd->SCp.buffers_residual = 0;
533 cmd->SCp.this_residual = 0;
538 #include <linux/delay.h>
544 signals[] = {{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" },
545 { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" },
546 { SR_SEL, "SEL" }, {0, NULL}},
547 basrs[] = {{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}},
548 icrs[] = {{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
549 {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"},
550 {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"},
552 mrs[] = {{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"},
553 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR,
554 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"},
555 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
556 {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"},
560 * Function : void NCR5380_print(struct Scsi_Host *instance)
562 * Purpose : print the SCSI bus signals for debugging purposes
564 * Input : instance - which NCR5380
567 static void NCR5380_print(struct Scsi_Host *instance) {
568 unsigned char status, data, basr, mr, icr, i;
571 local_irq_save(flags);
572 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
573 status = NCR5380_read(STATUS_REG);
574 mr = NCR5380_read(MODE_REG);
575 icr = NCR5380_read(INITIATOR_COMMAND_REG);
576 basr = NCR5380_read(BUS_AND_STATUS_REG);
577 local_irq_restore(flags);
578 printk("STATUS_REG: %02x ", status);
579 for (i = 0; signals[i].mask ; ++i)
580 if (status & signals[i].mask)
581 printk(",%s", signals[i].name);
582 printk("\nBASR: %02x ", basr);
583 for (i = 0; basrs[i].mask ; ++i)
584 if (basr & basrs[i].mask)
585 printk(",%s", basrs[i].name);
586 printk("\nICR: %02x ", icr);
587 for (i = 0; icrs[i].mask; ++i)
588 if (icr & icrs[i].mask)
589 printk(",%s", icrs[i].name);
590 printk("\nMODE: %02x ", mr);
591 for (i = 0; mrs[i].mask; ++i)
592 if (mr & mrs[i].mask)
593 printk(",%s", mrs[i].name);
601 {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
602 {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
603 {PHASE_UNKNOWN, "UNKNOWN"}};
606 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
608 * Purpose : print the current SCSI phase for debugging purposes
610 * Input : instance - which NCR5380
613 static void NCR5380_print_phase(struct Scsi_Host *instance)
615 unsigned char status;
618 status = NCR5380_read(STATUS_REG);
619 if (!(status & SR_REQ))
620 printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
622 for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
623 (phases[i].value != (status & PHASE_MASK)); ++i);
624 printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name);
631 __inline__ void NCR5380_print(struct Scsi_Host *instance) { };
632 __inline__ void NCR5380_print_phase(struct Scsi_Host *instance) { };
637 * ++roman: New scheme of calling NCR5380_main()
639 * If we're not in an interrupt, we can call our main directly, it cannot be
640 * already running. Else, we queue it on a task queue, if not 'main_running'
641 * tells us that a lower level is already executing it. This way,
642 * 'main_running' needs not be protected in a special way.
644 * queue_main() is a utility function for putting our main onto the task
645 * queue, if main_running is false. It should be called only from a
646 * interrupt or bottom half.
649 #include <linux/gfp.h>
650 #include <linux/workqueue.h>
651 #include <linux/interrupt.h>
653 static volatile int main_running = 0;
654 static DECLARE_WORK(NCR5380_tqueue, NCR5380_main);
656 static __inline__ void queue_main(void)
659 /* If in interrupt and NCR5380_main() not already running,
660 queue it on the 'immediate' task queue, to be processed
661 immediately after the current interrupt processing has
663 schedule_work(&NCR5380_tqueue);
665 /* else: nothing to do: the running NCR5380_main() will pick up
666 any newly queued command. */
670 static inline void NCR5380_all_init (void)
674 INI_PRINTK("scsi : NCR5380_all_init()\n");
681 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
683 * Purpose : called by probe code indicating the NCR5380 driver
684 * options that were selected.
686 * Inputs : instance, pointer to this instance. Unused.
689 static void __init NCR5380_print_options (struct Scsi_Host *instance)
691 printk(" generic options"
702 " SCSI-2 TAGGED QUEUING"
705 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
709 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
711 * Purpose : print commands in the various queues, called from
712 * NCR5380_abort and NCR5380_debug to aid debugging.
714 * Inputs : instance, pointer to this instance.
717 static void NCR5380_print_status (struct Scsi_Host *instance)
723 NCR_PRINT(NDEBUG_ANY);
724 NCR_PRINT_PHASE(NDEBUG_ANY);
726 pr_bfr = (char *) __get_free_page(GFP_ATOMIC);
728 printk("NCR5380_print_status: no memory for print buffer\n");
731 len = NCR5380_proc_info(instance, pr_bfr, &start, 0, PAGE_SIZE, 0);
733 printk("\n%s\n", pr_bfr);
734 free_page((unsigned long) pr_bfr);
738 /******************************************/
740 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
742 * *buffer: I/O buffer
743 * **start: if inout == FALSE pointer into buffer where user read should start
744 * offset: current offset
745 * length: length of buffer
746 * hostno: Scsi_Host host_no
747 * inout: TRUE - user is writing; FALSE - user is reading
749 * Return the number of bytes read from or written
753 #define SPRINTF(fmt,args...) \
754 do { if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \
755 pos += sprintf(pos, fmt , ## args); } while(0)
757 char *lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, char *pos, char *buffer,
760 static int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer,
761 char **start, off_t offset, int length, int inout)
764 struct NCR5380_hostdata *hostdata;
765 struct scsi_cmnd *ptr;
768 #define check_offset() \
770 if (pos - buffer < offset - begin) { \
771 begin += pos - buffer; \
776 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
778 if (inout) { /* Has data been written to the file ? */
779 return(-ENOSYS); /* Currently this is a no-op */
781 SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
783 local_irq_save(flags);
784 SPRINTF("NCR5380: coroutine is%s running.\n", main_running ? "" : "n't");
786 if (!hostdata->connected)
787 SPRINTF("scsi%d: no currently connected command\n", HOSTNO);
789 pos = lprint_Scsi_Cmnd ((struct scsi_cmnd *) hostdata->connected,
790 pos, buffer, length);
791 SPRINTF("scsi%d: issue_queue\n", HOSTNO);
793 for (ptr = (struct scsi_cmnd *) hostdata->issue_queue; ptr; ptr = NEXT(ptr))
795 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
799 SPRINTF("scsi%d: disconnected_queue\n", HOSTNO);
801 for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr;
803 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
807 local_irq_restore(flags);
808 *start = buffer + (offset - begin);
809 if (pos - buffer < offset - begin)
811 else if (pos - buffer - (offset - begin) < length)
812 return pos - buffer - (offset - begin);
816 static char *lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, char *pos, char *buffer,
820 unsigned char *command;
821 SPRINTF("scsi%d: destination target %d, lun %d\n",
822 H_NO(cmd), cmd->device->id, cmd->device->lun);
823 SPRINTF(" command = ");
825 SPRINTF("%2d (0x%02x)", command[0], command[0]);
826 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
827 SPRINTF(" %02x", command[i]);
834 * Function : void NCR5380_init (struct Scsi_Host *instance)
836 * Purpose : initializes *instance and corresponding 5380 chip.
838 * Inputs : instance - instantiation of the 5380 driver.
840 * Notes : I assume that the host, hostno, and id bits have been
841 * set correctly. I don't care about the irq and other fields.
845 static int __init NCR5380_init(struct Scsi_Host *instance, int flags)
848 SETUP_HOSTDATA(instance);
852 hostdata->aborted = 0;
853 hostdata->id_mask = 1 << instance->this_id;
854 hostdata->id_higher_mask = 0;
855 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
856 if (i > hostdata->id_mask)
857 hostdata->id_higher_mask |= i;
858 for (i = 0; i < 8; ++i)
859 hostdata->busy[i] = 0;
863 #if defined (REAL_DMA)
864 hostdata->dma_len = 0;
866 hostdata->targets_present = 0;
867 hostdata->connected = NULL;
868 hostdata->issue_queue = NULL;
869 hostdata->disconnected_queue = NULL;
870 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
873 the_template = instance->hostt;
874 first_instance = instance;
879 if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1))
880 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
881 " without AUTOSENSE option, contingent allegiance conditions may\n"
882 " be incorrectly cleared.\n", HOSTNO);
883 #endif /* def AUTOSENSE */
885 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
886 NCR5380_write(MODE_REG, MR_BASE);
887 NCR5380_write(TARGET_COMMAND_REG, 0);
888 NCR5380_write(SELECT_ENABLE_REG, 0);
893 static void NCR5380_exit(struct Scsi_Host *instance)
895 /* Empty, as we didn't schedule any delayed work */
899 * Function : int NCR5380_queue_command (struct scsi_cmnd *cmd,
900 * void (*done)(struct scsi_cmnd *))
902 * Purpose : enqueues a SCSI command
904 * Inputs : cmd - SCSI command, done - function called on completion, with
905 * a pointer to the command descriptor.
910 * cmd is added to the per instance issue_queue, with minor
911 * twiddling done to the host specific fields of cmd. If the
912 * main coroutine is not running, it is restarted.
916 /* Only make static if a wrapper function is used */
917 static int NCR5380_queue_command_lck(struct scsi_cmnd *cmd,
918 void (*done)(struct scsi_cmnd *))
920 SETUP_HOSTDATA(cmd->device->host);
921 struct scsi_cmnd *tmp;
924 #if (NDEBUG & NDEBUG_NO_WRITE)
925 switch (cmd->cmnd[0]) {
928 printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
930 cmd->result = (DID_ERROR << 16);
934 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
939 if (!hostdata->connected && !hostdata->issue_queue &&
940 !hostdata->disconnected_queue) {
941 hostdata->timebase = jiffies;
944 # ifdef NCR5380_STAT_LIMIT
945 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
947 switch (cmd->cmnd[0])
952 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
953 hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);
954 hostdata->pendingw++;
959 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
960 hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);
961 hostdata->pendingr++;
967 * We use the host_scribble field as a pointer to the next command
972 cmd->scsi_done = done;
978 * Insert the cmd into the issue queue. Note that REQUEST SENSE
979 * commands are added to the head of the queue since any command will
980 * clear the contingent allegiance condition that exists and the
981 * sense data is only guaranteed to be valid while the condition exists.
984 local_irq_save(flags);
985 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
986 * Otherwise a running NCR5380_main may steal the lock.
987 * Lock before actually inserting due to fairness reasons explained in
988 * atari_scsi.c. If we insert first, then it's impossible for this driver
989 * to release the lock.
990 * Stop timer for this command while waiting for the lock, or timeouts
991 * may happen (and they really do), and it's no good if the command doesn't
992 * appear in any of the queues.
993 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
994 * because also a timer int can trigger an abort or reset, which would
995 * alter queues and touch the lock.
997 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
998 LIST(cmd, hostdata->issue_queue);
999 SET_NEXT(cmd, hostdata->issue_queue);
1000 hostdata->issue_queue = cmd;
1002 for (tmp = (struct scsi_cmnd *)hostdata->issue_queue;
1003 NEXT(tmp); tmp = NEXT(tmp))
1009 local_irq_restore(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)
1028 static DEF_SCSI_QCMD(NCR5380_queue_command)
1031 * Function : NCR5380_main (void)
1033 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1034 * be done on the NCR5380 host adapters in a system. Both
1035 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1036 * in case it is not running.
1038 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
1039 * reenable them. This prevents reentrancy and kernel stack overflow.
1042 static void NCR5380_main (struct work_struct *bl)
1044 struct scsi_cmnd *tmp, *prev;
1045 struct Scsi_Host *instance = first_instance;
1046 struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
1048 unsigned long flags;
1051 * We run (with interrupts disabled) until we're sure that none of
1052 * the host adapters have anything that can be done, at which point
1053 * we set main_running to 0 and exit.
1055 * Interrupts are enabled before doing various other internal
1056 * instructions, after we've decided that we need to run through
1059 * this should prevent any race conditions.
1061 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1062 * because also a timer int can trigger an abort or reset, which can
1063 * alter queues and touch the Falcon lock.
1066 /* Tell int handlers main() is now already executing. Note that
1067 no races are possible here. If an int comes in before
1068 'main_running' is set here, and queues/executes main via the
1069 task queue, it doesn't do any harm, just this instance of main
1070 won't find any work left to do. */
1075 local_save_flags(flags);
1077 local_irq_disable(); /* Freeze request queues */
1080 if (!hostdata->connected) {
1081 MAIN_PRINTK( "scsi%d: not connected\n", HOSTNO );
1083 * Search through the issue_queue for a command destined
1084 * for a target that's not busy.
1086 #if (NDEBUG & NDEBUG_LISTS)
1087 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL;
1088 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1090 if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/
1092 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue,
1093 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) {
1095 #if (NDEBUG & NDEBUG_LISTS)
1097 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
1098 tmp, tmp->target, hostdata->busy[tmp->target],
1101 /* When we find one, remove it from the issue queue. */
1102 /* ++guenther: possible race with Falcon locking */
1105 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
1107 !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))
1110 /* ++guenther: just to be sure, this must be atomic */
1111 local_irq_disable();
1113 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
1114 SET_NEXT(prev, NEXT(tmp));
1116 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1117 hostdata->issue_queue = NEXT(tmp);
1119 SET_NEXT(tmp, NULL);
1121 /* reenable interrupts after finding one */
1122 local_irq_restore(flags);
1125 * Attempt to establish an I_T_L nexus here.
1126 * On success, instance->hostdata->connected is set.
1127 * On failure, we must add the command back to the
1128 * issue queue so we can keep trying.
1130 MAIN_PRINTK("scsi%d: main(): command for target %d "
1131 "lun %d removed from issue_queue\n",
1132 HOSTNO, tmp->target, tmp->lun);
1134 * REQUEST SENSE commands are issued without tagged
1135 * queueing, even on SCSI-II devices because the
1136 * contingent allegiance condition exists for the
1139 /* ++roman: ...and the standard also requires that
1140 * REQUEST SENSE command are untagged.
1144 cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE );
1146 if (!NCR5380_select(instance, tmp,
1147 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
1151 local_irq_disable();
1152 LIST(tmp, hostdata->issue_queue);
1153 SET_NEXT(tmp, hostdata->issue_queue);
1154 hostdata->issue_queue = tmp;
1156 cmd_free_tag( tmp );
1158 local_irq_restore(flags);
1159 MAIN_PRINTK("scsi%d: main(): select() failed, "
1160 "returned to issue_queue\n", HOSTNO);
1161 if (hostdata->connected)
1164 } /* if target/lun/target queue is not busy */
1165 } /* for issue_queue */
1166 } /* if (!hostdata->connected) */
1167 if (hostdata->connected
1169 && !hostdata->dma_len
1172 local_irq_restore(flags);
1173 MAIN_PRINTK("scsi%d: main: performing information transfer\n",
1175 NCR5380_information_transfer(instance);
1176 MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
1181 /* Better allow ints _after_ 'main_running' has been cleared, else
1182 an interrupt could believe we'll pick up the work it left for
1183 us, but we won't see it anymore here... */
1185 local_irq_restore(flags);
1191 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1193 * Purpose : Called by interrupt handler when DMA finishes or a phase
1194 * mismatch occurs (which would finish the DMA transfer).
1196 * Inputs : instance - this instance of the NCR5380.
1200 static void NCR5380_dma_complete( struct Scsi_Host *instance )
1202 SETUP_HOSTDATA(instance);
1204 unsigned char **data;
1205 volatile int *count;
1207 if (!hostdata->connected) {
1208 printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
1209 "no connected cmd\n", HOSTNO);
1213 DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1214 HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
1215 NCR5380_read(STATUS_REG));
1217 if((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) {
1218 printk("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", HOSTNO);
1219 printk("please e-mail sammy@sammy.net with a description of how this\n");
1220 printk("error was produced.\n");
1224 /* make sure we're not stuck in a data phase */
1225 if((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH |
1227 (BASR_PHASE_MATCH | BASR_ACK)) {
1228 printk("scsi%d: BASR %02x\n", HOSTNO, NCR5380_read(BUS_AND_STATUS_REG));
1229 printk("scsi%d: bus stuck in data phase -- probably a single byte "
1230 "overrun!\n", HOSTNO);
1231 printk("not prepared for this error!\n");
1232 printk("please e-mail sammy@sammy.net with a description of how this\n");
1233 printk("error was produced.\n");
1239 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1240 NCR5380_write(MODE_REG, MR_BASE);
1241 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1243 transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
1244 hostdata->dma_len = 0;
1246 data = (unsigned char **) &(hostdata->connected->SCp.ptr);
1247 count = &(hostdata->connected->SCp.this_residual);
1248 *data += transfered;
1249 *count -= transfered;
1252 #endif /* REAL_DMA */
1256 * Function : void NCR5380_intr (int irq)
1258 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1259 * from the disconnected queue, and restarting NCR5380_main()
1262 * Inputs : int irq, irq that caused this interrupt.
1266 static irqreturn_t NCR5380_intr (int irq, void *dev_id)
1268 struct Scsi_Host *instance = first_instance;
1269 int done = 1, handled = 0;
1272 INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
1274 /* Look for pending interrupts */
1275 basr = NCR5380_read(BUS_AND_STATUS_REG);
1276 INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
1277 /* dispatch to appropriate routine if found and done=0 */
1278 if (basr & BASR_IRQ) {
1279 NCR_PRINT(NDEBUG_INTR);
1280 if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
1283 INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
1284 NCR5380_reselect(instance);
1285 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1287 else if (basr & BASR_PARITY_ERROR) {
1288 INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
1289 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1291 else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1292 INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
1293 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1297 * The rest of the interrupt conditions can occur only during a
1301 #if defined(REAL_DMA)
1303 * We should only get PHASE MISMATCH and EOP interrupts if we have
1304 * DMA enabled, so do a sanity check based on the current setting
1305 * of the MODE register.
1308 if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
1309 ((basr & BASR_END_DMA_TRANSFER) ||
1310 !(basr & BASR_PHASE_MATCH))) {
1312 INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
1313 NCR5380_dma_complete( instance );
1317 #endif /* REAL_DMA */
1319 /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1320 if (basr & BASR_PHASE_MATCH)
1321 INT_PRINTK("scsi%d: unknown interrupt, "
1322 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1323 HOSTNO, basr, NCR5380_read(MODE_REG),
1324 NCR5380_read(STATUS_REG));
1325 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1326 #ifdef SUN3_SCSI_VME
1327 dregs->csr |= CSR_DMA_ENABLE;
1330 } /* if !(SELECTION || PARITY) */
1335 printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
1336 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
1337 NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
1338 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1339 #ifdef SUN3_SCSI_VME
1340 dregs->csr |= CSR_DMA_ENABLE;
1345 INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
1346 /* Put a call to NCR5380_main() on the queue... */
1349 return IRQ_RETVAL(handled);
1352 #ifdef NCR5380_STATS
1353 static void collect_stats(struct NCR5380_hostdata *hostdata,
1354 struct scsi_cmnd *cmd)
1356 # ifdef NCR5380_STAT_LIMIT
1357 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
1359 switch (cmd->cmnd[0])
1364 hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
1365 /*hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);*/
1366 hostdata->pendingw--;
1371 hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
1372 /*hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);*/
1373 hostdata->pendingr--;
1380 * Function : int NCR5380_select(struct Scsi_Host *instance,
1381 * struct scsi_cmnd *cmd, int tag);
1383 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1384 * including ARBITRATION, SELECTION, and initial message out for
1385 * IDENTIFY and queue messages.
1387 * Inputs : instance - instantiation of the 5380 driver on which this
1388 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1389 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1390 * the command that is presently connected.
1392 * Returns : -1 if selection could not execute for some reason,
1393 * 0 if selection succeeded or failed because the target
1397 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1398 * with registers as they should have been on entry - ie
1399 * SELECT_ENABLE will be set appropriately, the NCR5380
1400 * will cease to drive any SCSI bus signals.
1402 * If successful : I_T_L or I_T_L_Q nexus will be established,
1403 * instance->connected will be set to cmd.
1404 * SELECT interrupt will be disabled.
1406 * If failed (no target) : cmd->scsi_done() will be called, and the
1407 * cmd->result host byte set to DID_BAD_TARGET.
1410 static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd,
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.
1430 local_irq_save(flags);
1431 if (hostdata->connected) {
1432 local_irq_restore(flags);
1435 NCR5380_write(TARGET_COMMAND_REG, 0);
1439 * Start arbitration.
1442 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1443 NCR5380_write(MODE_REG, MR_ARBITRATE);
1445 local_irq_restore(flags);
1447 /* Wait for arbitration logic to complete */
1450 unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
1452 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1453 && time_before(jiffies, timeout) && !hostdata->connected)
1455 if (time_after_eq(jiffies, timeout))
1457 printk("scsi : arbitration timeout at %d\n", __LINE__);
1458 NCR5380_write(MODE_REG, MR_BASE);
1459 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1463 #else /* NCR_TIMEOUT */
1464 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1465 && !hostdata->connected);
1468 ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
1470 if (hostdata->connected) {
1471 NCR5380_write(MODE_REG, MR_BASE);
1475 * The arbitration delay is 2.2us, but this is a minimum and there is
1476 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1477 * the integral nature of udelay().
1483 /* Check for lost arbitration */
1484 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1485 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1486 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1487 hostdata->connected) {
1488 NCR5380_write(MODE_REG, MR_BASE);
1489 ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1494 /* after/during arbitration, BSY should be asserted.
1495 IBM DPES-31080 Version S31Q works now */
1496 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1497 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL |
1500 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1501 hostdata->connected) {
1502 NCR5380_write(MODE_REG, MR_BASE);
1503 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1504 ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1510 * Again, bus clear + bus settle time is 1.2us, however, this is
1511 * a minimum so we'll udelay ceil(1.2)
1514 #ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1515 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1521 if (hostdata->connected) {
1522 NCR5380_write(MODE_REG, MR_BASE);
1523 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1527 ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
1530 * Now that we have won arbitration, start Selection process, asserting
1531 * the host and target ID's on the SCSI bus.
1534 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
1537 * Raise ATN while SEL is true before BSY goes false from arbitration,
1538 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1539 * phase immediately after selection.
1542 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
1543 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
1544 NCR5380_write(MODE_REG, MR_BASE);
1547 * Reselect interrupts must be turned off prior to the dropping of BSY,
1548 * otherwise we will trigger an interrupt.
1551 if (hostdata->connected) {
1552 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1556 NCR5380_write(SELECT_ENABLE_REG, 0);
1559 * The initiator shall then wait at least two deskew delays and release
1562 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1565 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
1566 ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1569 * Something weird happens when we cease to drive BSY - looks
1570 * like the board/chip is letting us do another read before the
1571 * appropriate propagation delay has expired, and we're confusing
1572 * a BSY signal from ourselves as the target's response to SELECTION.
1574 * A small delay (the 'C++' frontend breaks the pipeline with an
1575 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1576 * tighter 'C' code breaks and requires this) solves the problem -
1577 * the 1 us delay is arbitrary, and only used because this delay will
1578 * be the same on other platforms and since it works here, it should
1581 * wingel suggests that this could be due to failing to wait
1587 SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
1590 * The SCSI specification calls for a 250 ms timeout for the actual
1594 timeout = jiffies + 25;
1597 * XXX very interesting - we're seeing a bounce where the BSY we
1598 * asserted is being reflected / still asserted (propagation delay?)
1599 * and it's detecting as true. Sigh.
1603 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1604 * IO while SEL is true. But again, there are some disks out the in the
1605 * world that do that nevertheless. (Somebody claimed that this announces
1606 * reselection capability of the target.) So we better skip that test and
1607 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
1610 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) &
1613 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) ==
1615 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1616 NCR5380_reselect(instance);
1617 printk (KERN_ERR "scsi%d: reselection after won arbitration?\n",
1619 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1623 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY));
1627 * No less than two deskew delays after the initiator detects the
1628 * BSY signal is true, it shall release the SEL signal and may
1629 * change the DATA BUS. -wingel
1634 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1636 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1637 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1638 if (hostdata->targets_present & (1 << cmd->device->id)) {
1639 printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
1640 if (hostdata->restart_select)
1641 printk(KERN_NOTICE "\trestart select\n");
1642 NCR_PRINT(NDEBUG_ANY);
1643 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1646 cmd->result = DID_BAD_TARGET << 16;
1647 #ifdef NCR5380_STATS
1648 collect_stats(hostdata, cmd);
1651 cmd_free_tag( cmd );
1653 cmd->scsi_done(cmd);
1654 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1655 SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
1656 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1660 hostdata->targets_present |= (1 << cmd->device->id);
1663 * Since we followed the SCSI spec, and raised ATN while SEL
1664 * was true but before BSY was false during selection, the information
1665 * transfer phase should be a MESSAGE OUT phase so that we can send the
1668 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1669 * message (2 bytes) with a tag ID that we increment with every command
1670 * until it wraps back to 0.
1672 * XXX - it turns out that there are some broken SCSI-II devices,
1673 * which claim to support tagged queuing but fail when more than
1674 * some number of commands are issued at once.
1677 /* Wait for start of REQ/ACK handshake */
1678 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
1680 SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1681 HOSTNO, cmd->device->id);
1682 tmp[0] = IDENTIFY(1, cmd->device->lun);
1685 if (cmd->tag != TAG_NONE) {
1686 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1694 #endif /* SUPPORT_TAGS */
1696 /* Send message(s) */
1698 phase = PHASE_MSGOUT;
1699 NCR5380_transfer_pio(instance, &phase, &len, &data);
1700 SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
1701 /* XXX need to handle errors here */
1702 hostdata->connected = cmd;
1703 #ifndef SUPPORT_TAGS
1704 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1706 #ifdef SUN3_SCSI_VME
1707 dregs->csr |= CSR_INTR;
1709 initialize_SCp(cmd);
1716 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1717 * unsigned char *phase, int *count, unsigned char **data)
1719 * Purpose : transfers data in given phase using polled I/O
1721 * Inputs : instance - instance of driver, *phase - pointer to
1722 * what phase is expected, *count - pointer to number of
1723 * bytes to transfer, **data - pointer to data pointer.
1725 * Returns : -1 when different phase is entered without transferring
1726 * maximum number of bytes, 0 if all bytes are transferred or exit
1729 * Also, *phase, *count, *data are modified in place.
1731 * XXX Note : handling for bus free may be useful.
1735 * Note : this code is not as quick as it could be, however it
1736 * IS 100% reliable, and for the actual data transfer where speed
1737 * counts, we will always do a pseudo DMA or DMA transfer.
1740 static int NCR5380_transfer_pio( struct Scsi_Host *instance,
1741 unsigned char *phase, int *count,
1742 unsigned char **data)
1744 register unsigned char p = *phase, tmp;
1745 register int c = *count;
1746 register unsigned char *d = *data;
1749 * The NCR5380 chip will only drive the SCSI bus when the
1750 * phase specified in the appropriate bits of the TARGET COMMAND
1751 * REGISTER match the STATUS REGISTER
1754 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1758 * Wait for assertion of REQ, after which the phase bits will be
1761 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
1763 HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
1765 /* Check for phase mismatch */
1766 if ((tmp & PHASE_MASK) != p) {
1767 PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
1768 NCR_PRINT_PHASE(NDEBUG_PIO);
1772 /* Do actual transfer from SCSI bus to / from memory */
1774 NCR5380_write(OUTPUT_DATA_REG, *d);
1776 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1781 * The SCSI standard suggests that in MSGOUT phase, the initiator
1782 * should drop ATN on the last byte of the message phase
1783 * after REQ has been asserted for the handshake but before
1784 * the initiator raises ACK.
1788 if (!((p & SR_MSG) && c > 1)) {
1789 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1791 NCR_PRINT(NDEBUG_PIO);
1792 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1793 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1795 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1796 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1797 NCR_PRINT(NDEBUG_PIO);
1798 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1799 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1802 NCR_PRINT(NDEBUG_PIO);
1803 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1806 while (NCR5380_read(STATUS_REG) & SR_REQ);
1808 HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
1811 * We have several special cases to consider during REQ/ACK handshaking :
1812 * 1. We were in MSGOUT phase, and we are on the last byte of the
1813 * message. ATN must be dropped as ACK is dropped.
1815 * 2. We are in a MSGIN phase, and we are on the last byte of the
1816 * message. We must exit with ACK asserted, so that the calling
1817 * code may raise ATN before dropping ACK to reject the message.
1819 * 3. ACK and ATN are clear and the target may proceed as normal.
1821 if (!(p == PHASE_MSGIN && c == 1)) {
1822 if (p == PHASE_MSGOUT && c > 1)
1823 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1825 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1829 PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
1833 tmp = NCR5380_read(STATUS_REG);
1834 /* The phase read from the bus is valid if either REQ is (already)
1835 * asserted or if ACK hasn't been released yet. The latter is the case if
1836 * we're in MSGIN and all wanted bytes have been received. */
1837 if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
1838 *phase = tmp & PHASE_MASK;
1840 *phase = PHASE_UNKNOWN;
1842 if (!c || (*phase == p))
1849 * Function : do_abort (Scsi_Host *host)
1851 * Purpose : abort the currently established nexus. Should only be
1852 * called from a routine which can drop into a
1854 * Returns : 0 on success, -1 on failure.
1857 static int do_abort (struct Scsi_Host *host)
1859 unsigned char tmp, *msgptr, phase;
1862 /* Request message out phase */
1863 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1866 * Wait for the target to indicate a valid phase by asserting
1867 * REQ. Once this happens, we'll have either a MSGOUT phase
1868 * and can immediately send the ABORT message, or we'll have some
1869 * other phase and will have to source/sink data.
1871 * We really don't care what value was on the bus or what value
1872 * the target sees, so we just handshake.
1875 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
1877 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1879 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1880 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1882 while (NCR5380_read(STATUS_REG) & SR_REQ);
1883 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1889 phase = PHASE_MSGOUT;
1890 NCR5380_transfer_pio (host, &phase, &len, &msgptr);
1893 * If we got here, and the command completed successfully,
1894 * we're about to go into bus free state.
1897 return len ? -1 : 0;
1900 #if defined(REAL_DMA)
1902 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1903 * unsigned char *phase, int *count, unsigned char **data)
1905 * Purpose : transfers data in given phase using either real
1908 * Inputs : instance - instance of driver, *phase - pointer to
1909 * what phase is expected, *count - pointer to number of
1910 * bytes to transfer, **data - pointer to data pointer.
1912 * Returns : -1 when different phase is entered without transferring
1913 * maximum number of bytes, 0 if all bytes or transferred or exit
1916 * Also, *phase, *count, *data are modified in place.
1921 static int NCR5380_transfer_dma( struct Scsi_Host *instance,
1922 unsigned char *phase, int *count,
1923 unsigned char **data)
1925 SETUP_HOSTDATA(instance);
1926 register int c = *count;
1927 register unsigned char p = *phase;
1928 unsigned long flags;
1931 if(!sun3_dma_setup_done) {
1932 printk("scsi%d: transfer_dma without setup!\n", HOSTNO);
1935 hostdata->dma_len = c;
1937 DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1938 HOSTNO, (p & SR_IO) ? "reading" : "writing",
1939 c, (p & SR_IO) ? "to" : "from", *data);
1941 /* netbsd turns off ints here, why not be safe and do it too */
1942 local_irq_save(flags);
1944 /* send start chain */
1945 sun3scsi_dma_start(c, *data);
1948 NCR5380_write(TARGET_COMMAND_REG, 1);
1949 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1950 NCR5380_write(INITIATOR_COMMAND_REG, 0);
1951 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1952 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1954 NCR5380_write(TARGET_COMMAND_REG, 0);
1955 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1956 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA);
1957 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1958 NCR5380_write(START_DMA_SEND_REG, 0);
1961 #ifdef SUN3_SCSI_VME
1962 dregs->csr |= CSR_DMA_ENABLE;
1965 local_irq_restore(flags);
1967 sun3_dma_active = 1;
1970 #endif /* defined(REAL_DMA) */
1973 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1975 * Purpose : run through the various SCSI phases and do as the target
1976 * directs us to. Operates on the currently connected command,
1977 * instance->connected.
1979 * Inputs : instance, instance for which we are doing commands
1981 * Side effects : SCSI things happen, the disconnected queue will be
1982 * modified if a command disconnects, *instance->connected will
1985 * XXX Note : we need to watch for bus free or a reset condition here
1986 * to recover from an unexpected bus free condition.
1989 static void NCR5380_information_transfer (struct Scsi_Host *instance)
1991 SETUP_HOSTDATA(instance);
1992 unsigned long flags;
1993 unsigned char msgout = NOP;
1996 #if defined(REAL_DMA)
1999 unsigned char *data;
2000 unsigned char phase, tmp, extended_msg[10], old_phase=0xff;
2001 struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected;
2003 #ifdef SUN3_SCSI_VME
2004 dregs->csr |= CSR_INTR;
2008 tmp = NCR5380_read(STATUS_REG);
2009 /* We only have a valid SCSI phase when REQ is asserted */
2011 phase = (tmp & PHASE_MASK);
2012 if (phase != old_phase) {
2014 NCR_PRINT_PHASE(NDEBUG_INFORMATION);
2017 if(phase == PHASE_CMDOUT) {
2019 unsigned long count;
2021 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2022 count = cmd->SCp.buffer->length;
2023 d = SGADDR(cmd->SCp.buffer);
2025 count = cmd->SCp.this_residual;
2029 /* this command setup for dma yet? */
2030 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done
2033 if (cmd->request->cmd_type == REQ_TYPE_FS) {
2034 sun3scsi_dma_setup(d, count,
2035 rq_data_dir(cmd->request));
2036 sun3_dma_setup_done = cmd;
2040 #ifdef SUN3_SCSI_VME
2041 dregs->csr |= CSR_INTR;
2046 if (sink && (phase != PHASE_MSGOUT)) {
2047 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2049 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
2051 while (NCR5380_read(STATUS_REG) & SR_REQ);
2052 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2060 #if (NDEBUG & NDEBUG_NO_DATAOUT)
2061 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2062 "aborted\n", HOSTNO);
2065 cmd->result = DID_ERROR << 16;
2066 cmd->scsi_done(cmd);
2071 * If there is no room left in the current buffer in the
2072 * scatter-gather list, move onto the next one.
2074 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2076 --cmd->SCp.buffers_residual;
2077 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2078 cmd->SCp.ptr = SGADDR(cmd->SCp.buffer);
2080 /* ++roman: Try to merge some scatter-buffers if
2081 * they are at contiguous physical addresses.
2083 // merge_contiguous_buffers( cmd );
2084 INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
2085 HOSTNO, cmd->SCp.this_residual,
2086 cmd->SCp.buffers_residual);
2090 * The preferred transfer method is going to be
2091 * PSEUDO-DMA for systems that are strictly PIO,
2092 * since we can let the hardware do the handshaking.
2094 * For this to work, we need to know the transfersize
2095 * ahead of time, since the pseudo-DMA code will sit
2096 * in an unconditional loop.
2099 /* ++roman: I suggest, this should be
2101 * instead of leaving REAL_DMA out.
2104 #if defined(REAL_DMA)
2105 // if (!cmd->device->borken &&
2107 NCR5380_dma_xfer_len(instance,cmd,phase)) > SUN3_DMA_MINSIZE) {
2109 cmd->SCp.phase = phase;
2111 if (NCR5380_transfer_dma(instance, &phase,
2112 &len, (unsigned char **) &cmd->SCp.ptr)) {
2114 * If the watchdog timer fires, all future
2115 * accesses to this device will use the
2117 printk(KERN_NOTICE "scsi%d: switching target %d "
2118 "lun %d to slow handshake\n", HOSTNO,
2119 cmd->device->id, cmd->device->lun);
2120 cmd->device->borken = 1;
2121 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2125 cmd->result = DID_ERROR << 16;
2126 cmd->scsi_done(cmd);
2127 /* XXX - need to source or sink data here, as appropriate */
2130 /* ++roman: When using real DMA,
2131 * information_transfer() should return after
2132 * starting DMA since it has nothing more to
2137 cmd->SCp.this_residual -= transfersize - len;
2141 #endif /* defined(REAL_DMA) */
2142 NCR5380_transfer_pio(instance, &phase,
2143 (int *) &cmd->SCp.this_residual, (unsigned char **)
2146 /* if we had intended to dma that command clear it */
2147 if(sun3_dma_setup_done == cmd)
2148 sun3_dma_setup_done = NULL;
2155 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
2156 NCR5380_transfer_pio(instance, &phase, &len, &data);
2157 cmd->SCp.Message = tmp;
2161 * Linking lets us reduce the time required to get the
2162 * next command out to the device, hopefully this will
2163 * mean we don't waste another revolution due to the delays
2164 * required by ARBITRATION and another SELECTION.
2166 * In the current implementation proposal, low level drivers
2167 * merely have to start the next command, pointed to by
2168 * next_link, done() is called as with unlinked commands.
2171 case LINKED_CMD_COMPLETE:
2172 case LINKED_FLG_CMD_COMPLETE:
2173 /* Accept message by clearing ACK */
2174 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2176 LNK_PRINTK("scsi%d: target %d lun %d linked command "
2177 "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);
2179 /* Enable reselect interrupts */
2180 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2182 * Sanity check : A linked command should only terminate
2183 * with one of these messages if there are more linked
2184 * commands available.
2187 if (!cmd->next_link) {
2188 printk(KERN_NOTICE "scsi%d: target %d lun %d "
2189 "linked command complete, no next_link\n",
2190 HOSTNO, cmd->device->id, cmd->device->lun);
2192 do_abort (instance);
2196 initialize_SCp(cmd->next_link);
2197 /* The next command is still part of this process; copy it
2198 * and don't free it! */
2199 cmd->next_link->tag = cmd->tag;
2200 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2201 LNK_PRINTK("scsi%d: target %d lun %d linked request "
2202 "done, calling scsi_done().\n",
2203 HOSTNO, cmd->device->id, cmd->device->lun);
2204 #ifdef NCR5380_STATS
2205 collect_stats(hostdata, cmd);
2207 cmd->scsi_done(cmd);
2208 cmd = hostdata->connected;
2210 #endif /* def LINKED */
2212 case COMMAND_COMPLETE:
2213 /* Accept message by clearing ACK */
2214 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2215 hostdata->connected = NULL;
2216 QU_PRINTK("scsi%d: command for target %d, lun %d "
2217 "completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
2219 cmd_free_tag( cmd );
2220 if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
2221 /* Turn a QUEUE FULL status into BUSY, I think the
2222 * mid level cannot handle QUEUE FULL :-( (The
2223 * command is retried after BUSY). Also update our
2224 * queue size to the number of currently issued
2227 /* ++Andreas: the mid level code knows about
2229 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
2230 TAG_PRINTK("scsi%d: target %d lun %d returned "
2231 "QUEUE_FULL after %d commands\n",
2232 HOSTNO, cmd->device->id, cmd->device->lun,
2234 if (ta->queue_size > ta->nr_allocated)
2235 ta->nr_allocated = ta->queue_size;
2238 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2240 /* Enable reselect interrupts */
2241 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2244 * I'm not sure what the correct thing to do here is :
2246 * If the command that just executed is NOT a request
2247 * sense, the obvious thing to do is to set the result
2248 * code to the values of the stored parameters.
2250 * If it was a REQUEST SENSE command, we need some way to
2251 * differentiate between the failure code of the original
2252 * and the failure code of the REQUEST sense - the obvious
2253 * case is success, where we fall through and leave the
2254 * result code unchanged.
2256 * The non-obvious place is where the REQUEST SENSE failed
2259 if (cmd->cmnd[0] != REQUEST_SENSE)
2260 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2261 else if (status_byte(cmd->SCp.Status) != GOOD)
2262 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2265 if ((cmd->cmnd[0] == REQUEST_SENSE) &&
2266 hostdata->ses.cmd_len) {
2267 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
2268 hostdata->ses.cmd_len = 0 ;
2271 if ((cmd->cmnd[0] != REQUEST_SENSE) &&
2272 (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2273 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
2274 ASEN_PRINTK("scsi%d: performing request sense\n",
2276 /* this is initialized from initialize_SCp
2277 cmd->SCp.buffer = NULL;
2278 cmd->SCp.buffers_residual = 0;
2281 local_irq_save(flags);
2282 LIST(cmd,hostdata->issue_queue);
2283 SET_NEXT(cmd, hostdata->issue_queue);
2284 hostdata->issue_queue = (struct scsi_cmnd *) cmd;
2285 local_irq_restore(flags);
2286 QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
2287 "issue queue\n", H_NO(cmd));
2289 #endif /* def AUTOSENSE */
2291 #ifdef NCR5380_STATS
2292 collect_stats(hostdata, cmd);
2294 cmd->scsi_done(cmd);
2297 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2299 * Restore phase bits to 0 so an interrupted selection,
2300 * arbitration can resume.
2302 NCR5380_write(TARGET_COMMAND_REG, 0);
2304 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2308 case MESSAGE_REJECT:
2309 /* Accept message by clearing ACK */
2310 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2311 /* Enable reselect interrupts */
2312 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2313 switch (hostdata->last_message) {
2314 case HEAD_OF_QUEUE_TAG:
2315 case ORDERED_QUEUE_TAG:
2316 case SIMPLE_QUEUE_TAG:
2317 /* The target obviously doesn't support tagged
2318 * queuing, even though it announced this ability in
2319 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2320 * clear 'tagged_supported' and lock the LUN, since
2321 * the command is treated as untagged further on.
2323 cmd->device->tagged_supported = 0;
2324 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2325 cmd->tag = TAG_NONE;
2326 TAG_PRINTK("scsi%d: target %d lun %d rejected "
2327 "QUEUE_TAG message; tagged queuing "
2329 HOSTNO, cmd->device->id, cmd->device->lun);
2334 /* Accept message by clearing ACK */
2335 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2336 local_irq_save(flags);
2337 cmd->device->disconnect = 1;
2338 LIST(cmd,hostdata->disconnected_queue);
2339 SET_NEXT(cmd, hostdata->disconnected_queue);
2340 hostdata->connected = NULL;
2341 hostdata->disconnected_queue = cmd;
2342 local_irq_restore(flags);
2343 QU_PRINTK("scsi%d: command for target %d lun %d was "
2344 "moved from connected to the "
2345 "disconnected_queue\n", HOSTNO,
2346 cmd->device->id, cmd->device->lun);
2348 * Restore phase bits to 0 so an interrupted selection,
2349 * arbitration can resume.
2351 NCR5380_write(TARGET_COMMAND_REG, 0);
2353 /* Enable reselect interrupts */
2354 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2355 /* Wait for bus free to avoid nasty timeouts */
2356 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2358 #ifdef SUN3_SCSI_VME
2359 dregs->csr |= CSR_DMA_ENABLE;
2363 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2364 * operation, in violation of the SCSI spec so we can safely
2365 * ignore SAVE/RESTORE pointers calls.
2367 * Unfortunately, some disks violate the SCSI spec and
2368 * don't issue the required SAVE_POINTERS message before
2369 * disconnecting, and we have to break spec to remain
2373 case RESTORE_POINTERS:
2374 /* Accept message by clearing ACK */
2375 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2376 /* Enable reselect interrupts */
2377 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2379 case EXTENDED_MESSAGE:
2381 * Extended messages are sent in the following format :
2383 * 0 EXTENDED_MESSAGE == 1
2384 * 1 length (includes one byte for code, doesn't
2385 * include first two bytes)
2387 * 3..length+1 arguments
2389 * Start the extended message buffer with the EXTENDED_MESSAGE
2390 * byte, since spi_print_msg() wants the whole thing.
2392 extended_msg[0] = EXTENDED_MESSAGE;
2393 /* Accept first byte by clearing ACK */
2394 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2396 EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
2399 data = extended_msg + 1;
2400 phase = PHASE_MSGIN;
2401 NCR5380_transfer_pio(instance, &phase, &len, &data);
2402 EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2403 (int)extended_msg[1], (int)extended_msg[2]);
2405 if (!len && extended_msg[1] <=
2406 (sizeof (extended_msg) - 1)) {
2407 /* Accept third byte by clearing ACK */
2408 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2409 len = extended_msg[1] - 1;
2410 data = extended_msg + 3;
2411 phase = PHASE_MSGIN;
2413 NCR5380_transfer_pio(instance, &phase, &len, &data);
2414 EXT_PRINTK("scsi%d: message received, residual %d\n",
2417 switch (extended_msg[2]) {
2420 case EXTENDED_MODIFY_DATA_POINTER:
2421 case EXTENDED_EXTENDED_IDENTIFY:
2425 printk(KERN_NOTICE "scsi%d: error receiving "
2426 "extended message\n", HOSTNO);
2429 printk(KERN_NOTICE "scsi%d: extended message "
2430 "code %02x length %d is too long\n",
2431 HOSTNO, extended_msg[2], extended_msg[1]);
2434 /* Fall through to reject message */
2437 * If we get something weird that we aren't expecting,
2442 printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
2443 spi_print_msg(extended_msg);
2445 } else if (tmp != EXTENDED_MESSAGE)
2446 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2447 "message %02x from target %d, lun %d\n",
2448 HOSTNO, tmp, cmd->device->id, cmd->device->lun);
2450 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2452 "code %02x, length %d from target %d, lun %d\n",
2453 HOSTNO, extended_msg[1], extended_msg[0],
2454 cmd->device->id, cmd->device->lun);
2457 msgout = MESSAGE_REJECT;
2458 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2461 } /* switch (tmp) */
2466 hostdata->last_message = msgout;
2467 NCR5380_transfer_pio(instance, &phase, &len, &data);
2468 if (msgout == ABORT) {
2470 cmd_free_tag( cmd );
2472 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2474 hostdata->connected = NULL;
2475 cmd->result = DID_ERROR << 16;
2476 #ifdef NCR5380_STATS
2477 collect_stats(hostdata, cmd);
2479 cmd->scsi_done(cmd);
2480 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2489 * XXX for performance reasons, on machines with a
2490 * PSEUDO-DMA architecture we should probably
2491 * use the dma transfer function.
2493 NCR5380_transfer_pio(instance, &phase, &len,
2499 NCR5380_transfer_pio(instance, &phase, &len, &data);
2500 cmd->SCp.Status = tmp;
2503 printk("scsi%d: unknown phase\n", HOSTNO);
2504 NCR_PRINT(NDEBUG_ANY);
2505 } /* switch(phase) */
2506 } /* if (tmp * SR_REQ) */
2511 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2513 * Purpose : does reselection, initializing the instance->connected
2514 * field to point to the struct scsi_cmnd for which the I_T_L or I_T_L_Q
2515 * nexus has been reestablished,
2517 * Inputs : instance - this instance of the NCR5380.
2521 /* it might eventually prove necessary to do a dma setup on
2522 reselection, but it doesn't seem to be needed now -- sam */
2524 static void NCR5380_reselect (struct Scsi_Host *instance)
2526 SETUP_HOSTDATA(instance);
2527 unsigned char target_mask;
2532 unsigned char msg[3];
2533 struct scsi_cmnd *tmp = NULL, *prev;
2534 /* unsigned long flags; */
2537 * Disable arbitration, etc. since the host adapter obviously
2538 * lost, and tell an interrupted NCR5380_select() to restart.
2541 NCR5380_write(MODE_REG, MR_BASE);
2542 hostdata->restart_select = 1;
2544 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2546 RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
2549 * At this point, we have detected that our SCSI ID is on the bus,
2550 * SEL is true and BSY was false for at least one bus settle delay
2553 * We must assert BSY ourselves, until the target drops the SEL
2557 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2559 while (NCR5380_read(STATUS_REG) & SR_SEL);
2560 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2563 * Wait for target to go into MSGIN.
2566 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
2569 // acknowledge toggle to MSGIN
2570 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN));
2572 // peek at the byte without really hitting the bus
2573 msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG);
2576 if (!(msg[0] & 0x80)) {
2577 printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
2582 lun = (msg[0] & 0x07);
2585 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2586 * just reestablished, and remove it from the disconnected queue.
2589 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL;
2590 tmp; prev = tmp, tmp = NEXT(tmp) ) {
2591 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2593 && (tag == tmp->tag)
2597 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
2598 SET_NEXT(prev, NEXT(tmp));
2600 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2601 hostdata->disconnected_queue = NEXT(tmp);
2603 SET_NEXT(tmp, NULL);
2609 printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
2613 "not in disconnected_queue.\n",
2614 HOSTNO, target_mask, lun
2620 * Since we have an established nexus that we can't do anything
2621 * with, we must abort it.
2627 /* engage dma setup for the command we just saw */
2630 unsigned long count;
2632 if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) {
2633 count = tmp->SCp.buffer->length;
2634 d = SGADDR(tmp->SCp.buffer);
2636 count = tmp->SCp.this_residual;
2640 /* setup this command for dma if not already */
2641 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done != tmp))
2643 sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request));
2644 sun3_dma_setup_done = tmp;
2650 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
2651 /* Accept message by clearing ACK */
2652 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2655 /* If the phase is still MSGIN, the target wants to send some more
2656 * messages. In case it supports tagged queuing, this is probably a
2657 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2660 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2661 /* Accept previous IDENTIFY message by clearing ACK */
2662 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2665 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2666 msg[1] == SIMPLE_QUEUE_TAG)
2668 TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
2669 "reselection\n", HOSTNO, target_mask, lun, tag);
2673 hostdata->connected = tmp;
2674 RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2675 HOSTNO, tmp->target, tmp->lun, tmp->tag);
2680 * Function : int NCR5380_abort(struct scsi_cmnd *cmd)
2682 * Purpose : abort a command
2684 * Inputs : cmd - the struct scsi_cmnd to abort, code - code to set the
2685 * host byte of the result field to, if zero DID_ABORTED is
2688 * Returns : 0 - success, -1 on failure.
2690 * XXX - there is no way to abort the command that is currently
2691 * connected, you have to wait for it to complete. If this is
2692 * a problem, we could implement longjmp() / setjmp(), setjmp()
2693 * called where the loop started in NCR5380_main().
2696 static int NCR5380_abort(struct scsi_cmnd *cmd)
2698 struct Scsi_Host *instance = cmd->device->host;
2699 SETUP_HOSTDATA(instance);
2700 struct scsi_cmnd *tmp, **prev;
2701 unsigned long flags;
2703 printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
2704 scsi_print_command(cmd);
2706 NCR5380_print_status (instance);
2708 local_irq_save(flags);
2710 ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
2711 NCR5380_read(BUS_AND_STATUS_REG),
2712 NCR5380_read(STATUS_REG));
2716 * Case 1 : If the command is the currently executing command,
2717 * we'll set the aborted flag and return control so that
2718 * information transfer routine can exit cleanly.
2721 if (hostdata->connected == cmd) {
2723 ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO);
2725 * We should perform BSY checking, and make sure we haven't slipped
2729 /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2731 * Since we can't change phases until we've completed the current
2732 * handshake, we have to source or sink a byte of data if the current
2733 * phase is not MSGOUT.
2737 * Return control to the executing NCR drive so we can clear the
2738 * aborted flag and get back into our main loop.
2741 if (do_abort(instance) == 0) {
2742 hostdata->aborted = 1;
2743 hostdata->connected = NULL;
2744 cmd->result = DID_ABORT << 16;
2746 cmd_free_tag( cmd );
2748 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2750 local_irq_restore(flags);
2751 cmd->scsi_done(cmd);
2752 return SCSI_ABORT_SUCCESS;
2754 /* local_irq_restore(flags); */
2755 printk("scsi%d: abort of connected command failed!\n", HOSTNO);
2756 return SCSI_ABORT_ERROR;
2762 * Case 2 : If the command hasn't been issued yet, we simply remove it
2763 * from the issue queue.
2765 for (prev = (struct scsi_cmnd **) &(hostdata->issue_queue),
2766 tmp = (struct scsi_cmnd *) hostdata->issue_queue;
2767 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp))
2769 REMOVE(5, *prev, tmp, NEXT(tmp));
2770 (*prev) = NEXT(tmp);
2771 SET_NEXT(tmp, NULL);
2772 tmp->result = DID_ABORT << 16;
2773 local_irq_restore(flags);
2774 ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
2776 /* Tagged queuing note: no tag to free here, hasn't been assigned
2778 tmp->scsi_done(tmp);
2779 return SCSI_ABORT_SUCCESS;
2783 * Case 3 : If any commands are connected, we're going to fail the abort
2784 * and let the high level SCSI driver retry at a later time or
2787 * Timeouts, and therefore aborted commands, will be highly unlikely
2788 * and handling them cleanly in this situation would make the common
2789 * case of noresets less efficient, and would pollute our code. So,
2793 if (hostdata->connected) {
2794 local_irq_restore(flags);
2795 ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
2796 return SCSI_ABORT_SNOOZE;
2800 * Case 4: If the command is currently disconnected from the bus, and
2801 * there are no connected commands, we reconnect the I_T_L or
2802 * I_T_L_Q nexus associated with it, go into message out, and send
2805 * This case is especially ugly. In order to reestablish the nexus, we
2806 * need to call NCR5380_select(). The easiest way to implement this
2807 * function was to abort if the bus was busy, and let the interrupt
2808 * handler triggered on the SEL for reselect take care of lost arbitrations
2809 * where necessary, meaning interrupts need to be enabled.
2811 * When interrupts are enabled, the queues may change - so we
2812 * can't remove it from the disconnected queue before selecting it
2813 * because that could cause a failure in hashing the nexus if that
2814 * device reselected.
2816 * Since the queues may change, we can't use the pointers from when we
2819 * So, we must first locate the command, and if NCR5380_select()
2820 * succeeds, then issue the abort, relocate the command and remove
2821 * it from the disconnected queue.
2824 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp;
2827 local_irq_restore(flags);
2828 ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
2830 if (NCR5380_select (instance, cmd, (int) cmd->tag))
2831 return SCSI_ABORT_BUSY;
2833 ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
2835 do_abort (instance);
2837 local_irq_save(flags);
2838 for (prev = (struct scsi_cmnd **) &(hostdata->disconnected_queue),
2839 tmp = (struct scsi_cmnd *) hostdata->disconnected_queue;
2840 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
2842 REMOVE(5, *prev, tmp, NEXT(tmp));
2844 SET_NEXT(tmp, NULL);
2845 tmp->result = DID_ABORT << 16;
2846 /* We must unlock the tag/LUN immediately here, since the
2847 * target goes to BUS FREE and doesn't send us another
2848 * message (COMMAND_COMPLETE or the like)
2851 cmd_free_tag( tmp );
2853 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2855 local_irq_restore(flags);
2856 tmp->scsi_done(tmp);
2857 return SCSI_ABORT_SUCCESS;
2862 * Case 5 : If we reached this point, the command was not found in any of
2865 * We probably reached this point because of an unlikely race condition
2866 * between the command completing successfully and the abortion code,
2867 * so we won't panic, but we will notify the user in case something really
2871 local_irq_restore(flags);
2872 printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO);
2874 return SCSI_ABORT_NOT_RUNNING;
2879 * Function : int NCR5380_bus_reset(struct scsi_cmnd *cmd)
2881 * Purpose : reset the SCSI bus.
2883 * Returns : SCSI_RESET_WAKEUP
2887 static int NCR5380_bus_reset(struct scsi_cmnd *cmd)
2889 SETUP_HOSTDATA(cmd->device->host);
2891 unsigned long flags;
2893 struct scsi_cmnd *connected, *disconnected_queue;
2897 NCR5380_print_status (cmd->device->host);
2900 NCR5380_write( TARGET_COMMAND_REG,
2901 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
2903 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
2905 /* reset NCR registers */
2906 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2907 NCR5380_write( MODE_REG, MR_BASE );
2908 NCR5380_write( TARGET_COMMAND_REG, 0 );
2909 NCR5380_write( SELECT_ENABLE_REG, 0 );
2910 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2911 * through anymore ... */
2912 (void)NCR5380_read( RESET_PARITY_INTERRUPT_REG );
2914 #if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
2915 /* XXX see below XXX */
2917 /* MSch: old-style reset: actually abort all command processing here */
2919 /* After the reset, there are no more connected or disconnected commands
2920 * and no busy units; to avoid problems with re-inserting the commands
2921 * into the issue_queue (via scsi_done()), the aborted commands are
2922 * remembered in local variables first.
2924 local_irq_save(flags);
2925 connected = (struct scsi_cmnd *)hostdata->connected;
2926 hostdata->connected = NULL;
2927 disconnected_queue = (struct scsi_cmnd *)hostdata->disconnected_queue;
2928 hostdata->disconnected_queue = NULL;
2932 for( i = 0; i < 8; ++i )
2933 hostdata->busy[i] = 0;
2935 hostdata->dma_len = 0;
2937 local_irq_restore(flags);
2939 /* In order to tell the mid-level code which commands were aborted,
2940 * set the command status to DID_RESET and call scsi_done() !!!
2941 * This ultimately aborts processing of these commands in the mid-level.
2944 if ((cmd = connected)) {
2945 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2946 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2947 cmd->scsi_done( cmd );
2950 for (i = 0; (cmd = disconnected_queue); ++i) {
2951 disconnected_queue = NEXT(cmd);
2952 SET_NEXT(cmd, NULL);
2953 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2954 cmd->scsi_done( cmd );
2957 ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
2960 /* since all commands have been explicitly terminated, we need to tell
2961 * the midlevel code that the reset was SUCCESSFUL, and there is no
2962 * need to 'wake up' the commands by a request_sense
2964 return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
2967 /* MSch: new-style reset handling: let the mid-level do what it can */
2969 /* ++guenther: MID-LEVEL IS STILL BROKEN.
2970 * Mid-level is supposed to requeue all commands that were active on the
2971 * various low-level queues. In fact it does this, but that's not enough
2972 * because all these commands are subject to timeout. And if a timeout
2973 * happens for any removed command, *_abort() is called but all queues
2974 * are now empty. Abort then gives up the falcon lock, which is fatal,
2975 * since the mid-level will queue more commands and must have the lock
2976 * (it's all happening inside timer interrupt handler!!).
2977 * Even worse, abort will return NOT_RUNNING for all those commands not
2978 * on any queue, so they won't be retried ...
2980 * Conclusion: either scsi.c disables timeout for all resetted commands
2981 * immediately, or we lose! As of linux-2.0.20 it doesn't.
2984 /* After the reset, there are no more connected or disconnected commands
2985 * and no busy units; so clear the low-level status here to avoid
2986 * conflicts when the mid-level code tries to wake up the affected
2990 if (hostdata->issue_queue)
2991 ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
2992 if (hostdata->connected)
2993 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2994 if (hostdata->disconnected_queue)
2995 ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
2997 local_irq_save(flags);
2998 hostdata->issue_queue = NULL;
2999 hostdata->connected = NULL;
3000 hostdata->disconnected_queue = NULL;
3004 for( i = 0; i < 8; ++i )
3005 hostdata->busy[i] = 0;
3007 hostdata->dma_len = 0;
3009 local_irq_restore(flags);
3011 /* we did no complete reset of all commands, so a wakeup is required */
3012 return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;
3016 /* Local Variables: */