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 NEXTADDR(cmd) ((struct scsi_cmnd **)&((cmd)->host_scribble))
272 #define HOSTNO instance->host_no
273 #define H_NO(cmd) (cmd)->device->host->host_no
275 #define SGADDR(buffer) (void *)(((unsigned long)sg_virt(((buffer)))))
280 * Functions for handling tagged queuing
281 * =====================================
283 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
285 * Using consecutive numbers for the tags is no good idea in my eyes. There
286 * could be wrong re-usings if the counter (8 bit!) wraps and some early
287 * command has been preempted for a long time. My solution: a bitfield for
288 * remembering used tags.
290 * There's also the problem that each target has a certain queue size, but we
291 * cannot know it in advance :-( We just see a QUEUE_FULL status being
292 * returned. So, in this case, the driver internal queue size assumption is
293 * reduced to the number of active tags if QUEUE_FULL is returned by the
294 * target. The command is returned to the mid-level, but with status changed
295 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
298 * We're also not allowed running tagged commands as long as an untagged
299 * command is active. And REQUEST SENSE commands after a contingent allegiance
300 * condition _must_ be untagged. To keep track whether an untagged command has
301 * been issued, the host->busy array is still employed, as it is without
302 * support for tagged queuing.
304 * One could suspect that there are possible race conditions between
305 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
306 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
307 * which already guaranteed to be running at most once. It is also the only
308 * place where tags/LUNs are allocated. So no other allocation can slip
309 * between that pair, there could only happen a reselection, which can free a
310 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
311 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
314 /* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
316 #define TAG_NONE 0xff
318 /* For the m68k, the number of bits in 'allocated' must be a multiple of 32! */
319 #if (MAX_TAGS % 32) != 0
320 #error "MAX_TAGS must be a multiple of 32!"
324 char allocated[MAX_TAGS/8];
329 static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */
332 static void __init init_tags( void )
337 if (!setup_use_tagged_queuing)
340 for( target = 0; target < 8; ++target ) {
341 for( lun = 0; lun < 8; ++lun ) {
342 ta = &TagAlloc[target][lun];
343 memset( &ta->allocated, 0, MAX_TAGS/8 );
344 ta->nr_allocated = 0;
345 /* At the beginning, assume the maximum queue size we could
346 * support (MAX_TAGS). This value will be decreased if the target
347 * returns QUEUE_FULL status.
349 ta->queue_size = MAX_TAGS;
355 /* Check if we can issue a command to this LUN: First see if the LUN is marked
356 * busy by an untagged command. If the command should use tagged queuing, also
357 * check that there is a free tag and the target's queue won't overflow. This
358 * function should be called with interrupts disabled to avoid race
362 static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged)
364 SETUP_HOSTDATA(cmd->device->host);
366 if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun))
368 if (!should_be_tagged ||
369 !setup_use_tagged_queuing || !cmd->device->tagged_supported)
371 if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >=
372 TagAlloc[cmd->device->id][cmd->device->lun].queue_size ) {
373 TAG_PRINTK( "scsi%d: target %d lun %d: no free tags\n",
374 H_NO(cmd), cmd->device->id, cmd->device->lun );
381 /* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
382 * must be called before!), or reserve the LUN in 'busy' if the command is
386 static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged)
388 SETUP_HOSTDATA(cmd->device->host);
390 /* If we or the target don't support tagged queuing, allocate the LUN for
391 * an untagged command.
393 if (!should_be_tagged ||
394 !setup_use_tagged_queuing || !cmd->device->tagged_supported) {
396 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
397 TAG_PRINTK( "scsi%d: target %d lun %d now allocated by untagged "
398 "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun );
401 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
403 cmd->tag = find_first_zero_bit( &ta->allocated, MAX_TAGS );
404 set_bit( cmd->tag, &ta->allocated );
406 TAG_PRINTK( "scsi%d: using tag %d for target %d lun %d "
407 "(now %d tags in use)\n",
408 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun,
414 /* Mark the tag of command 'cmd' as free, or in case of an untagged command,
418 static void cmd_free_tag(struct scsi_cmnd *cmd)
420 SETUP_HOSTDATA(cmd->device->host);
422 if (cmd->tag == TAG_NONE) {
423 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
424 TAG_PRINTK( "scsi%d: target %d lun %d untagged cmd finished\n",
425 H_NO(cmd), cmd->device->id, cmd->device->lun );
427 else if (cmd->tag >= MAX_TAGS) {
428 printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
429 H_NO(cmd), cmd->tag );
432 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
433 clear_bit( cmd->tag, &ta->allocated );
435 TAG_PRINTK( "scsi%d: freed tag %d for target %d lun %d\n",
436 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun );
441 static void free_all_tags( void )
446 if (!setup_use_tagged_queuing)
449 for( target = 0; target < 8; ++target ) {
450 for( lun = 0; lun < 8; ++lun ) {
451 ta = &TagAlloc[target][lun];
452 memset( &ta->allocated, 0, MAX_TAGS/8 );
453 ta->nr_allocated = 0;
458 #endif /* SUPPORT_TAGS */
462 * Function: void merge_contiguous_buffers(struct scsi_cmnd *cmd)
464 * Purpose: Try to merge several scatter-gather requests into one DMA
465 * transfer. This is possible if the scatter buffers lie on
466 * physical contiguous addresses.
468 * Parameters: struct scsi_cmnd *cmd
469 * The command to work on. The first scatter buffer's data are
470 * assumed to be already transfered into ptr/this_residual.
473 static void merge_contiguous_buffers(struct scsi_cmnd *cmd)
475 unsigned long endaddr;
476 #if (NDEBUG & NDEBUG_MERGING)
477 unsigned long oldlen = cmd->SCp.this_residual;
481 for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1;
482 cmd->SCp.buffers_residual &&
483 virt_to_phys(SGADDR(&(cmd->SCp.buffer[1]))) == endaddr; ) {
485 MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
486 SGADDR(&(cmd->SCp.buffer[1])), endaddr);
487 #if (NDEBUG & NDEBUG_MERGING)
491 --cmd->SCp.buffers_residual;
492 cmd->SCp.this_residual += cmd->SCp.buffer->length;
493 endaddr += cmd->SCp.buffer->length;
495 #if (NDEBUG & NDEBUG_MERGING)
496 if (oldlen != cmd->SCp.this_residual)
497 MER_PRINTK("merged %d buffers from %p, new length %08x\n",
498 cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
503 * Function : void initialize_SCp(struct scsi_cmnd *cmd)
505 * Purpose : initialize the saved data pointers for cmd to point to the
506 * start of the buffer.
508 * Inputs : cmd - struct scsi_cmnd structure to have pointers reset.
511 static __inline__ void initialize_SCp(struct scsi_cmnd *cmd)
514 * Initialize the Scsi Pointer field so that all of the commands in the
515 * various queues are valid.
518 if (scsi_bufflen(cmd)) {
519 cmd->SCp.buffer = scsi_sglist(cmd);
520 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
521 cmd->SCp.ptr = (char *) SGADDR(cmd->SCp.buffer);
522 cmd->SCp.this_residual = cmd->SCp.buffer->length;
524 /* ++roman: Try to merge some scatter-buffers if they are at
525 * contiguous physical addresses.
527 // merge_contiguous_buffers( cmd );
529 cmd->SCp.buffer = NULL;
530 cmd->SCp.buffers_residual = 0;
532 cmd->SCp.this_residual = 0;
537 #include <linux/delay.h>
543 signals[] = {{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" },
544 { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" },
545 { SR_SEL, "SEL" }, {0, NULL}},
546 basrs[] = {{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}},
547 icrs[] = {{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
548 {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"},
549 {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"},
551 mrs[] = {{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"},
552 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR,
553 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"},
554 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
555 {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"},
559 * Function : void NCR5380_print(struct Scsi_Host *instance)
561 * Purpose : print the SCSI bus signals for debugging purposes
563 * Input : instance - which NCR5380
566 static void NCR5380_print(struct Scsi_Host *instance) {
567 unsigned char status, data, basr, mr, icr, i;
570 local_irq_save(flags);
571 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
572 status = NCR5380_read(STATUS_REG);
573 mr = NCR5380_read(MODE_REG);
574 icr = NCR5380_read(INITIATOR_COMMAND_REG);
575 basr = NCR5380_read(BUS_AND_STATUS_REG);
576 local_irq_restore(flags);
577 printk("STATUS_REG: %02x ", status);
578 for (i = 0; signals[i].mask ; ++i)
579 if (status & signals[i].mask)
580 printk(",%s", signals[i].name);
581 printk("\nBASR: %02x ", basr);
582 for (i = 0; basrs[i].mask ; ++i)
583 if (basr & basrs[i].mask)
584 printk(",%s", basrs[i].name);
585 printk("\nICR: %02x ", icr);
586 for (i = 0; icrs[i].mask; ++i)
587 if (icr & icrs[i].mask)
588 printk(",%s", icrs[i].name);
589 printk("\nMODE: %02x ", mr);
590 for (i = 0; mrs[i].mask; ++i)
591 if (mr & mrs[i].mask)
592 printk(",%s", mrs[i].name);
600 {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
601 {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
602 {PHASE_UNKNOWN, "UNKNOWN"}};
605 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
607 * Purpose : print the current SCSI phase for debugging purposes
609 * Input : instance - which NCR5380
612 static void NCR5380_print_phase(struct Scsi_Host *instance)
614 unsigned char status;
617 status = NCR5380_read(STATUS_REG);
618 if (!(status & SR_REQ))
619 printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
621 for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
622 (phases[i].value != (status & PHASE_MASK)); ++i);
623 printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name);
630 __inline__ void NCR5380_print(struct Scsi_Host *instance) { };
631 __inline__ void NCR5380_print_phase(struct Scsi_Host *instance) { };
636 * ++roman: New scheme of calling NCR5380_main()
638 * If we're not in an interrupt, we can call our main directly, it cannot be
639 * already running. Else, we queue it on a task queue, if not 'main_running'
640 * tells us that a lower level is already executing it. This way,
641 * 'main_running' needs not be protected in a special way.
643 * queue_main() is a utility function for putting our main onto the task
644 * queue, if main_running is false. It should be called only from a
645 * interrupt or bottom half.
648 #include <linux/workqueue.h>
649 #include <linux/interrupt.h>
651 static volatile int main_running = 0;
652 static DECLARE_WORK(NCR5380_tqueue, NCR5380_main);
654 static __inline__ void queue_main(void)
657 /* If in interrupt and NCR5380_main() not already running,
658 queue it on the 'immediate' task queue, to be processed
659 immediately after the current interrupt processing has
661 schedule_work(&NCR5380_tqueue);
663 /* else: nothing to do: the running NCR5380_main() will pick up
664 any newly queued command. */
668 static inline void NCR5380_all_init (void)
672 INI_PRINTK("scsi : NCR5380_all_init()\n");
679 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
681 * Purpose : called by probe code indicating the NCR5380 driver
682 * options that were selected.
684 * Inputs : instance, pointer to this instance. Unused.
687 static void __init NCR5380_print_options (struct Scsi_Host *instance)
689 printk(" generic options"
700 " SCSI-2 TAGGED QUEUING"
703 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
707 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
709 * Purpose : print commands in the various queues, called from
710 * NCR5380_abort and NCR5380_debug to aid debugging.
712 * Inputs : instance, pointer to this instance.
715 static void NCR5380_print_status (struct Scsi_Host *instance)
721 NCR_PRINT(NDEBUG_ANY);
722 NCR_PRINT_PHASE(NDEBUG_ANY);
724 pr_bfr = (char *) __get_free_page(GFP_ATOMIC);
726 printk("NCR5380_print_status: no memory for print buffer\n");
729 len = NCR5380_proc_info(instance, pr_bfr, &start, 0, PAGE_SIZE, 0);
731 printk("\n%s\n", pr_bfr);
732 free_page((unsigned long) pr_bfr);
736 /******************************************/
738 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
740 * *buffer: I/O buffer
741 * **start: if inout == FALSE pointer into buffer where user read should start
742 * offset: current offset
743 * length: length of buffer
744 * hostno: Scsi_Host host_no
745 * inout: TRUE - user is writing; FALSE - user is reading
747 * Return the number of bytes read from or written
751 #define SPRINTF(fmt,args...) \
752 do { if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \
753 pos += sprintf(pos, fmt , ## args); } while(0)
755 char *lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, char *pos, char *buffer,
758 static int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer,
759 char **start, off_t offset, int length, int inout)
762 struct NCR5380_hostdata *hostdata;
763 struct scsi_cmnd *ptr;
766 #define check_offset() \
768 if (pos - buffer < offset - begin) { \
769 begin += pos - buffer; \
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);
781 local_irq_save(flags);
782 SPRINTF("NCR5380: coroutine is%s running.\n", main_running ? "" : "n't");
784 if (!hostdata->connected)
785 SPRINTF("scsi%d: no currently connected command\n", HOSTNO);
787 pos = lprint_Scsi_Cmnd ((struct scsi_cmnd *) hostdata->connected,
788 pos, buffer, length);
789 SPRINTF("scsi%d: issue_queue\n", HOSTNO);
791 for (ptr = (struct 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 = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr;
801 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
805 local_irq_restore(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);
814 static char *lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, char *pos, char *buffer,
818 unsigned char *command;
819 SPRINTF("scsi%d: destination target %d, lun %d\n",
820 H_NO(cmd), cmd->device->id, cmd->device->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 int 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);
892 * Function : int NCR5380_queue_command (struct scsi_cmnd *cmd,
893 * void (*done)(struct scsi_cmnd *))
895 * Purpose : enqueues a SCSI command
897 * Inputs : cmd - SCSI command, done - function called on completion, with
898 * a pointer to the command descriptor.
903 * cmd is added to the per instance issue_queue, with minor
904 * twiddling done to the host specific fields of cmd. If the
905 * main coroutine is not running, it is restarted.
909 /* Only make static if a wrapper function is used */
910 static int NCR5380_queue_command(struct scsi_cmnd *cmd,
911 void (*done)(struct scsi_cmnd *))
913 SETUP_HOSTDATA(cmd->device->host);
914 struct scsi_cmnd *tmp;
917 #if (NDEBUG & NDEBUG_NO_WRITE)
918 switch (cmd->cmnd[0]) {
921 printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
923 cmd->result = (DID_ERROR << 16);
927 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
932 if (!hostdata->connected && !hostdata->issue_queue &&
933 !hostdata->disconnected_queue) {
934 hostdata->timebase = jiffies;
937 # ifdef NCR5380_STAT_LIMIT
938 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
940 switch (cmd->cmnd[0])
945 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
946 hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);
947 hostdata->pendingw++;
952 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
953 hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);
954 hostdata->pendingr++;
960 * We use the host_scribble field as a pointer to the next command
965 cmd->scsi_done = done;
971 * Insert the cmd into the issue queue. Note that REQUEST SENSE
972 * commands are added to the head of the queue since any command will
973 * clear the contingent allegiance condition that exists and the
974 * sense data is only guaranteed to be valid while the condition exists.
977 local_irq_save(flags);
978 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
979 * Otherwise a running NCR5380_main may steal the lock.
980 * Lock before actually inserting due to fairness reasons explained in
981 * atari_scsi.c. If we insert first, then it's impossible for this driver
982 * to release the lock.
983 * Stop timer for this command while waiting for the lock, or timeouts
984 * may happen (and they really do), and it's no good if the command doesn't
985 * appear in any of the queues.
986 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
987 * because also a timer int can trigger an abort or reset, which would
988 * alter queues and touch the lock.
990 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
991 LIST(cmd, hostdata->issue_queue);
992 NEXT(cmd) = hostdata->issue_queue;
993 hostdata->issue_queue = cmd;
995 for (tmp = (struct scsi_cmnd *)hostdata->issue_queue;
996 NEXT(tmp); tmp = NEXT(tmp))
1002 local_irq_restore(flags);
1004 QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd),
1005 (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
1007 /* If queue_command() is called from an interrupt (real one or bottom
1008 * half), we let queue_main() do the job of taking care about main. If it
1009 * is already running, this is a no-op, else main will be queued.
1011 * If we're not in an interrupt, we can call NCR5380_main()
1012 * unconditionally, because it cannot be already running.
1014 if (in_interrupt() || ((flags >> 8) & 7) >= 6)
1022 * Function : NCR5380_main (void)
1024 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1025 * be done on the NCR5380 host adapters in a system. Both
1026 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1027 * in case it is not running.
1029 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
1030 * reenable them. This prevents reentrancy and kernel stack overflow.
1033 static void NCR5380_main (struct work_struct *bl)
1035 struct scsi_cmnd *tmp, *prev;
1036 struct Scsi_Host *instance = first_instance;
1037 struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
1039 unsigned long flags;
1042 * We run (with interrupts disabled) until we're sure that none of
1043 * the host adapters have anything that can be done, at which point
1044 * we set main_running to 0 and exit.
1046 * Interrupts are enabled before doing various other internal
1047 * instructions, after we've decided that we need to run through
1050 * this should prevent any race conditions.
1052 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1053 * because also a timer int can trigger an abort or reset, which can
1054 * alter queues and touch the Falcon lock.
1057 /* Tell int handlers main() is now already executing. Note that
1058 no races are possible here. If an int comes in before
1059 'main_running' is set here, and queues/executes main via the
1060 task queue, it doesn't do any harm, just this instance of main
1061 won't find any work left to do. */
1066 local_save_flags(flags);
1068 local_irq_disable(); /* Freeze request queues */
1071 if (!hostdata->connected) {
1072 MAIN_PRINTK( "scsi%d: not connected\n", HOSTNO );
1074 * Search through the issue_queue for a command destined
1075 * for a target that's not busy.
1077 #if (NDEBUG & NDEBUG_LISTS)
1078 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL;
1079 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1081 if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/
1083 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue,
1084 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) {
1086 #if (NDEBUG & NDEBUG_LISTS)
1088 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
1089 tmp, tmp->target, hostdata->busy[tmp->target],
1092 /* When we find one, remove it from the issue queue. */
1093 /* ++guenther: possible race with Falcon locking */
1096 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
1098 !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))
1101 /* ++guenther: just to be sure, this must be atomic */
1102 local_irq_disable();
1104 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
1105 NEXT(prev) = NEXT(tmp);
1107 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1108 hostdata->issue_queue = NEXT(tmp);
1112 /* reenable interrupts after finding one */
1113 local_irq_restore(flags);
1116 * Attempt to establish an I_T_L nexus here.
1117 * On success, instance->hostdata->connected is set.
1118 * On failure, we must add the command back to the
1119 * issue queue so we can keep trying.
1121 MAIN_PRINTK("scsi%d: main(): command for target %d "
1122 "lun %d removed from issue_queue\n",
1123 HOSTNO, tmp->target, tmp->lun);
1125 * REQUEST SENSE commands are issued without tagged
1126 * queueing, even on SCSI-II devices because the
1127 * contingent allegiance condition exists for the
1130 /* ++roman: ...and the standard also requires that
1131 * REQUEST SENSE command are untagged.
1135 cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE );
1137 if (!NCR5380_select(instance, tmp,
1138 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
1142 local_irq_disable();
1143 LIST(tmp, hostdata->issue_queue);
1144 NEXT(tmp) = hostdata->issue_queue;
1145 hostdata->issue_queue = tmp;
1147 cmd_free_tag( tmp );
1149 local_irq_restore(flags);
1150 MAIN_PRINTK("scsi%d: main(): select() failed, "
1151 "returned to issue_queue\n", HOSTNO);
1152 if (hostdata->connected)
1155 } /* if target/lun/target queue is not busy */
1156 } /* for issue_queue */
1157 } /* if (!hostdata->connected) */
1158 if (hostdata->connected
1160 && !hostdata->dma_len
1163 local_irq_restore(flags);
1164 MAIN_PRINTK("scsi%d: main: performing information transfer\n",
1166 NCR5380_information_transfer(instance);
1167 MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
1172 /* Better allow ints _after_ 'main_running' has been cleared, else
1173 an interrupt could believe we'll pick up the work it left for
1174 us, but we won't see it anymore here... */
1176 local_irq_restore(flags);
1182 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1184 * Purpose : Called by interrupt handler when DMA finishes or a phase
1185 * mismatch occurs (which would finish the DMA transfer).
1187 * Inputs : instance - this instance of the NCR5380.
1191 static void NCR5380_dma_complete( struct Scsi_Host *instance )
1193 SETUP_HOSTDATA(instance);
1195 unsigned char **data;
1196 volatile int *count;
1198 if (!hostdata->connected) {
1199 printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
1200 "no connected cmd\n", HOSTNO);
1204 DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1205 HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
1206 NCR5380_read(STATUS_REG));
1208 if((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) {
1209 printk("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", HOSTNO);
1210 printk("please e-mail sammy@sammy.net with a description of how this\n");
1211 printk("error was produced.\n");
1215 /* make sure we're not stuck in a data phase */
1216 if((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH |
1218 (BASR_PHASE_MATCH | BASR_ACK)) {
1219 printk("scsi%d: BASR %02x\n", HOSTNO, NCR5380_read(BUS_AND_STATUS_REG));
1220 printk("scsi%d: bus stuck in data phase -- probably a single byte "
1221 "overrun!\n", HOSTNO);
1222 printk("not prepared for this error!\n");
1223 printk("please e-mail sammy@sammy.net with a description of how this\n");
1224 printk("error was produced.\n");
1230 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1231 NCR5380_write(MODE_REG, MR_BASE);
1232 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1234 transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
1235 hostdata->dma_len = 0;
1237 data = (unsigned char **) &(hostdata->connected->SCp.ptr);
1238 count = &(hostdata->connected->SCp.this_residual);
1239 *data += transfered;
1240 *count -= transfered;
1243 #endif /* REAL_DMA */
1247 * Function : void NCR5380_intr (int irq)
1249 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1250 * from the disconnected queue, and restarting NCR5380_main()
1253 * Inputs : int irq, irq that caused this interrupt.
1257 static irqreturn_t NCR5380_intr (int irq, void *dev_id)
1259 struct Scsi_Host *instance = first_instance;
1260 int done = 1, handled = 0;
1263 INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
1265 /* Look for pending interrupts */
1266 basr = NCR5380_read(BUS_AND_STATUS_REG);
1267 INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
1268 /* dispatch to appropriate routine if found and done=0 */
1269 if (basr & BASR_IRQ) {
1270 NCR_PRINT(NDEBUG_INTR);
1271 if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
1274 INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
1275 NCR5380_reselect(instance);
1276 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1278 else if (basr & BASR_PARITY_ERROR) {
1279 INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
1280 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1282 else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1283 INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
1284 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1288 * The rest of the interrupt conditions can occur only during a
1292 #if defined(REAL_DMA)
1294 * We should only get PHASE MISMATCH and EOP interrupts if we have
1295 * DMA enabled, so do a sanity check based on the current setting
1296 * of the MODE register.
1299 if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
1300 ((basr & BASR_END_DMA_TRANSFER) ||
1301 !(basr & BASR_PHASE_MATCH))) {
1303 INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
1304 NCR5380_dma_complete( instance );
1308 #endif /* REAL_DMA */
1310 /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1311 if (basr & BASR_PHASE_MATCH)
1312 INT_PRINTK("scsi%d: unknown interrupt, "
1313 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1314 HOSTNO, basr, NCR5380_read(MODE_REG),
1315 NCR5380_read(STATUS_REG));
1316 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1317 #ifdef SUN3_SCSI_VME
1318 dregs->csr |= CSR_DMA_ENABLE;
1321 } /* if !(SELECTION || PARITY) */
1326 printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
1327 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
1328 NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
1329 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1330 #ifdef SUN3_SCSI_VME
1331 dregs->csr |= CSR_DMA_ENABLE;
1336 INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
1337 /* Put a call to NCR5380_main() on the queue... */
1340 return IRQ_RETVAL(handled);
1343 #ifdef NCR5380_STATS
1344 static void collect_stats(struct NCR5380_hostdata *hostdata,
1345 struct scsi_cmnd *cmd)
1347 # ifdef NCR5380_STAT_LIMIT
1348 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
1350 switch (cmd->cmnd[0])
1355 hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
1356 /*hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);*/
1357 hostdata->pendingw--;
1362 hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
1363 /*hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);*/
1364 hostdata->pendingr--;
1371 * Function : int NCR5380_select(struct Scsi_Host *instance,
1372 * struct scsi_cmnd *cmd, int tag);
1374 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1375 * including ARBITRATION, SELECTION, and initial message out for
1376 * IDENTIFY and queue messages.
1378 * Inputs : instance - instantiation of the 5380 driver on which this
1379 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1380 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1381 * the command that is presently connected.
1383 * Returns : -1 if selection could not execute for some reason,
1384 * 0 if selection succeeded or failed because the target
1388 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1389 * with registers as they should have been on entry - ie
1390 * SELECT_ENABLE will be set appropriately, the NCR5380
1391 * will cease to drive any SCSI bus signals.
1393 * If successful : I_T_L or I_T_L_Q nexus will be established,
1394 * instance->connected will be set to cmd.
1395 * SELECT interrupt will be disabled.
1397 * If failed (no target) : cmd->scsi_done() will be called, and the
1398 * cmd->result host byte set to DID_BAD_TARGET.
1401 static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd,
1404 SETUP_HOSTDATA(instance);
1405 unsigned char tmp[3], phase;
1406 unsigned char *data;
1408 unsigned long timeout;
1409 unsigned long flags;
1411 hostdata->restart_select = 0;
1412 NCR_PRINT(NDEBUG_ARBITRATION);
1413 ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO,
1417 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1418 * data bus during SELECTION.
1421 local_irq_save(flags);
1422 if (hostdata->connected) {
1423 local_irq_restore(flags);
1426 NCR5380_write(TARGET_COMMAND_REG, 0);
1430 * Start arbitration.
1433 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1434 NCR5380_write(MODE_REG, MR_ARBITRATE);
1436 local_irq_restore(flags);
1438 /* Wait for arbitration logic to complete */
1441 unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
1443 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1444 && time_before(jiffies, timeout) && !hostdata->connected)
1446 if (time_after_eq(jiffies, timeout))
1448 printk("scsi : arbitration timeout at %d\n", __LINE__);
1449 NCR5380_write(MODE_REG, MR_BASE);
1450 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1454 #else /* NCR_TIMEOUT */
1455 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1456 && !hostdata->connected);
1459 ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
1461 if (hostdata->connected) {
1462 NCR5380_write(MODE_REG, MR_BASE);
1466 * The arbitration delay is 2.2us, but this is a minimum and there is
1467 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1468 * the integral nature of udelay().
1474 /* Check for lost arbitration */
1475 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1476 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1477 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1478 hostdata->connected) {
1479 NCR5380_write(MODE_REG, MR_BASE);
1480 ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1485 /* after/during arbitration, BSY should be asserted.
1486 IBM DPES-31080 Version S31Q works now */
1487 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1488 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL |
1491 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1492 hostdata->connected) {
1493 NCR5380_write(MODE_REG, MR_BASE);
1494 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1495 ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1501 * Again, bus clear + bus settle time is 1.2us, however, this is
1502 * a minimum so we'll udelay ceil(1.2)
1505 #ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1506 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1512 if (hostdata->connected) {
1513 NCR5380_write(MODE_REG, MR_BASE);
1514 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1518 ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
1521 * Now that we have won arbitration, start Selection process, asserting
1522 * the host and target ID's on the SCSI bus.
1525 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
1528 * Raise ATN while SEL is true before BSY goes false from arbitration,
1529 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1530 * phase immediately after selection.
1533 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
1534 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
1535 NCR5380_write(MODE_REG, MR_BASE);
1538 * Reselect interrupts must be turned off prior to the dropping of BSY,
1539 * otherwise we will trigger an interrupt.
1542 if (hostdata->connected) {
1543 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1547 NCR5380_write(SELECT_ENABLE_REG, 0);
1550 * The initiator shall then wait at least two deskew delays and release
1553 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1556 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
1557 ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1560 * Something weird happens when we cease to drive BSY - looks
1561 * like the board/chip is letting us do another read before the
1562 * appropriate propagation delay has expired, and we're confusing
1563 * a BSY signal from ourselves as the target's response to SELECTION.
1565 * A small delay (the 'C++' frontend breaks the pipeline with an
1566 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1567 * tighter 'C' code breaks and requires this) solves the problem -
1568 * the 1 us delay is arbitrary, and only used because this delay will
1569 * be the same on other platforms and since it works here, it should
1572 * wingel suggests that this could be due to failing to wait
1578 SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
1581 * The SCSI specification calls for a 250 ms timeout for the actual
1585 timeout = jiffies + 25;
1588 * XXX very interesting - we're seeing a bounce where the BSY we
1589 * asserted is being reflected / still asserted (propagation delay?)
1590 * and it's detecting as true. Sigh.
1594 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1595 * IO while SEL is true. But again, there are some disks out the in the
1596 * world that do that nevertheless. (Somebody claimed that this announces
1597 * reselection capability of the target.) So we better skip that test and
1598 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
1601 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) &
1604 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) ==
1606 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1607 NCR5380_reselect(instance);
1608 printk (KERN_ERR "scsi%d: reselection after won arbitration?\n",
1610 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1614 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY));
1618 * No less than two deskew delays after the initiator detects the
1619 * BSY signal is true, it shall release the SEL signal and may
1620 * change the DATA BUS. -wingel
1625 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1627 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1628 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1629 if (hostdata->targets_present & (1 << cmd->device->id)) {
1630 printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
1631 if (hostdata->restart_select)
1632 printk(KERN_NOTICE "\trestart select\n");
1633 NCR_PRINT(NDEBUG_ANY);
1634 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1637 cmd->result = DID_BAD_TARGET << 16;
1638 #ifdef NCR5380_STATS
1639 collect_stats(hostdata, cmd);
1642 cmd_free_tag( cmd );
1644 cmd->scsi_done(cmd);
1645 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1646 SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
1647 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1651 hostdata->targets_present |= (1 << cmd->device->id);
1654 * Since we followed the SCSI spec, and raised ATN while SEL
1655 * was true but before BSY was false during selection, the information
1656 * transfer phase should be a MESSAGE OUT phase so that we can send the
1659 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1660 * message (2 bytes) with a tag ID that we increment with every command
1661 * until it wraps back to 0.
1663 * XXX - it turns out that there are some broken SCSI-II devices,
1664 * which claim to support tagged queuing but fail when more than
1665 * some number of commands are issued at once.
1668 /* Wait for start of REQ/ACK handshake */
1669 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
1671 SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1672 HOSTNO, cmd->device->id);
1673 tmp[0] = IDENTIFY(1, cmd->device->lun);
1676 if (cmd->tag != TAG_NONE) {
1677 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1685 #endif /* SUPPORT_TAGS */
1687 /* Send message(s) */
1689 phase = PHASE_MSGOUT;
1690 NCR5380_transfer_pio(instance, &phase, &len, &data);
1691 SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
1692 /* XXX need to handle errors here */
1693 hostdata->connected = cmd;
1694 #ifndef SUPPORT_TAGS
1695 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1697 #ifdef SUN3_SCSI_VME
1698 dregs->csr |= CSR_INTR;
1700 initialize_SCp(cmd);
1707 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1708 * unsigned char *phase, int *count, unsigned char **data)
1710 * Purpose : transfers data in given phase using polled I/O
1712 * Inputs : instance - instance of driver, *phase - pointer to
1713 * what phase is expected, *count - pointer to number of
1714 * bytes to transfer, **data - pointer to data pointer.
1716 * Returns : -1 when different phase is entered without transferring
1717 * maximum number of bytes, 0 if all bytes are transfered or exit
1720 * Also, *phase, *count, *data are modified in place.
1722 * XXX Note : handling for bus free may be useful.
1726 * Note : this code is not as quick as it could be, however it
1727 * IS 100% reliable, and for the actual data transfer where speed
1728 * counts, we will always do a pseudo DMA or DMA transfer.
1731 static int NCR5380_transfer_pio( struct Scsi_Host *instance,
1732 unsigned char *phase, int *count,
1733 unsigned char **data)
1735 register unsigned char p = *phase, tmp;
1736 register int c = *count;
1737 register unsigned char *d = *data;
1740 * The NCR5380 chip will only drive the SCSI bus when the
1741 * phase specified in the appropriate bits of the TARGET COMMAND
1742 * REGISTER match the STATUS REGISTER
1745 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1749 * Wait for assertion of REQ, after which the phase bits will be
1752 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
1754 HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
1756 /* Check for phase mismatch */
1757 if ((tmp & PHASE_MASK) != p) {
1758 PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
1759 NCR_PRINT_PHASE(NDEBUG_PIO);
1763 /* Do actual transfer from SCSI bus to / from memory */
1765 NCR5380_write(OUTPUT_DATA_REG, *d);
1767 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1772 * The SCSI standard suggests that in MSGOUT phase, the initiator
1773 * should drop ATN on the last byte of the message phase
1774 * after REQ has been asserted for the handshake but before
1775 * the initiator raises ACK.
1779 if (!((p & SR_MSG) && c > 1)) {
1780 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1782 NCR_PRINT(NDEBUG_PIO);
1783 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1784 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1786 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1787 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1788 NCR_PRINT(NDEBUG_PIO);
1789 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1790 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1793 NCR_PRINT(NDEBUG_PIO);
1794 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1797 while (NCR5380_read(STATUS_REG) & SR_REQ);
1799 HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
1802 * We have several special cases to consider during REQ/ACK handshaking :
1803 * 1. We were in MSGOUT phase, and we are on the last byte of the
1804 * message. ATN must be dropped as ACK is dropped.
1806 * 2. We are in a MSGIN phase, and we are on the last byte of the
1807 * message. We must exit with ACK asserted, so that the calling
1808 * code may raise ATN before dropping ACK to reject the message.
1810 * 3. ACK and ATN are clear and the target may proceed as normal.
1812 if (!(p == PHASE_MSGIN && c == 1)) {
1813 if (p == PHASE_MSGOUT && c > 1)
1814 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1816 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1820 PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
1824 tmp = NCR5380_read(STATUS_REG);
1825 /* The phase read from the bus is valid if either REQ is (already)
1826 * asserted or if ACK hasn't been released yet. The latter is the case if
1827 * we're in MSGIN and all wanted bytes have been received. */
1828 if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
1829 *phase = tmp & PHASE_MASK;
1831 *phase = PHASE_UNKNOWN;
1833 if (!c || (*phase == p))
1840 * Function : do_abort (Scsi_Host *host)
1842 * Purpose : abort the currently established nexus. Should only be
1843 * called from a routine which can drop into a
1845 * Returns : 0 on success, -1 on failure.
1848 static int do_abort (struct Scsi_Host *host)
1850 unsigned char tmp, *msgptr, phase;
1853 /* Request message out phase */
1854 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1857 * Wait for the target to indicate a valid phase by asserting
1858 * REQ. Once this happens, we'll have either a MSGOUT phase
1859 * and can immediately send the ABORT message, or we'll have some
1860 * other phase and will have to source/sink data.
1862 * We really don't care what value was on the bus or what value
1863 * the target sees, so we just handshake.
1866 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
1868 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1870 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1871 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1873 while (NCR5380_read(STATUS_REG) & SR_REQ);
1874 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1880 phase = PHASE_MSGOUT;
1881 NCR5380_transfer_pio (host, &phase, &len, &msgptr);
1884 * If we got here, and the command completed successfully,
1885 * we're about to go into bus free state.
1888 return len ? -1 : 0;
1891 #if defined(REAL_DMA)
1893 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1894 * unsigned char *phase, int *count, unsigned char **data)
1896 * Purpose : transfers data in given phase using either real
1899 * Inputs : instance - instance of driver, *phase - pointer to
1900 * what phase is expected, *count - pointer to number of
1901 * bytes to transfer, **data - pointer to data pointer.
1903 * Returns : -1 when different phase is entered without transferring
1904 * maximum number of bytes, 0 if all bytes or transfered or exit
1907 * Also, *phase, *count, *data are modified in place.
1912 static int NCR5380_transfer_dma( struct Scsi_Host *instance,
1913 unsigned char *phase, int *count,
1914 unsigned char **data)
1916 SETUP_HOSTDATA(instance);
1917 register int c = *count;
1918 register unsigned char p = *phase;
1919 unsigned long flags;
1922 if(!sun3_dma_setup_done) {
1923 printk("scsi%d: transfer_dma without setup!\n", HOSTNO);
1926 hostdata->dma_len = c;
1928 DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1929 HOSTNO, (p & SR_IO) ? "reading" : "writing",
1930 c, (p & SR_IO) ? "to" : "from", *data);
1932 /* netbsd turns off ints here, why not be safe and do it too */
1933 local_irq_save(flags);
1935 /* send start chain */
1936 sun3scsi_dma_start(c, *data);
1939 NCR5380_write(TARGET_COMMAND_REG, 1);
1940 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1941 NCR5380_write(INITIATOR_COMMAND_REG, 0);
1942 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1943 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1945 NCR5380_write(TARGET_COMMAND_REG, 0);
1946 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1947 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA);
1948 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1949 NCR5380_write(START_DMA_SEND_REG, 0);
1952 #ifdef SUN3_SCSI_VME
1953 dregs->csr |= CSR_DMA_ENABLE;
1956 local_irq_restore(flags);
1958 sun3_dma_active = 1;
1961 #endif /* defined(REAL_DMA) */
1964 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1966 * Purpose : run through the various SCSI phases and do as the target
1967 * directs us to. Operates on the currently connected command,
1968 * instance->connected.
1970 * Inputs : instance, instance for which we are doing commands
1972 * Side effects : SCSI things happen, the disconnected queue will be
1973 * modified if a command disconnects, *instance->connected will
1976 * XXX Note : we need to watch for bus free or a reset condition here
1977 * to recover from an unexpected bus free condition.
1980 static void NCR5380_information_transfer (struct Scsi_Host *instance)
1982 SETUP_HOSTDATA(instance);
1983 unsigned long flags;
1984 unsigned char msgout = NOP;
1987 #if defined(REAL_DMA)
1990 unsigned char *data;
1991 unsigned char phase, tmp, extended_msg[10], old_phase=0xff;
1992 struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected;
1994 #ifdef SUN3_SCSI_VME
1995 dregs->csr |= CSR_INTR;
1999 tmp = NCR5380_read(STATUS_REG);
2000 /* We only have a valid SCSI phase when REQ is asserted */
2002 phase = (tmp & PHASE_MASK);
2003 if (phase != old_phase) {
2005 NCR_PRINT_PHASE(NDEBUG_INFORMATION);
2008 if(phase == PHASE_CMDOUT) {
2010 unsigned long count;
2012 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2013 count = cmd->SCp.buffer->length;
2014 d = SGADDR(cmd->SCp.buffer);
2016 count = cmd->SCp.this_residual;
2020 /* this command setup for dma yet? */
2021 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done
2024 if(blk_fs_request(cmd->request)) {
2025 sun3scsi_dma_setup(d, count,
2026 rq_data_dir(cmd->request));
2027 sun3_dma_setup_done = cmd;
2031 #ifdef SUN3_SCSI_VME
2032 dregs->csr |= CSR_INTR;
2037 if (sink && (phase != PHASE_MSGOUT)) {
2038 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2040 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
2042 while (NCR5380_read(STATUS_REG) & SR_REQ);
2043 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2051 #if (NDEBUG & NDEBUG_NO_DATAOUT)
2052 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2053 "aborted\n", HOSTNO);
2056 cmd->result = DID_ERROR << 16;
2057 cmd->scsi_done(cmd);
2062 * If there is no room left in the current buffer in the
2063 * scatter-gather list, move onto the next one.
2065 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2067 --cmd->SCp.buffers_residual;
2068 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2069 cmd->SCp.ptr = SGADDR(cmd->SCp.buffer);
2071 /* ++roman: Try to merge some scatter-buffers if
2072 * they are at contiguous physical addresses.
2074 // merge_contiguous_buffers( cmd );
2075 INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
2076 HOSTNO, cmd->SCp.this_residual,
2077 cmd->SCp.buffers_residual);
2081 * The preferred transfer method is going to be
2082 * PSEUDO-DMA for systems that are strictly PIO,
2083 * since we can let the hardware do the handshaking.
2085 * For this to work, we need to know the transfersize
2086 * ahead of time, since the pseudo-DMA code will sit
2087 * in an unconditional loop.
2090 /* ++roman: I suggest, this should be
2092 * instead of leaving REAL_DMA out.
2095 #if defined(REAL_DMA)
2096 // if (!cmd->device->borken &&
2098 NCR5380_dma_xfer_len(instance,cmd,phase)) > SUN3_DMA_MINSIZE) {
2100 cmd->SCp.phase = phase;
2102 if (NCR5380_transfer_dma(instance, &phase,
2103 &len, (unsigned char **) &cmd->SCp.ptr)) {
2105 * If the watchdog timer fires, all future
2106 * accesses to this device will use the
2108 printk(KERN_NOTICE "scsi%d: switching target %d "
2109 "lun %d to slow handshake\n", HOSTNO,
2110 cmd->device->id, cmd->device->lun);
2111 cmd->device->borken = 1;
2112 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2116 cmd->result = DID_ERROR << 16;
2117 cmd->scsi_done(cmd);
2118 /* XXX - need to source or sink data here, as appropriate */
2121 /* ++roman: When using real DMA,
2122 * information_transfer() should return after
2123 * starting DMA since it has nothing more to
2128 cmd->SCp.this_residual -= transfersize - len;
2132 #endif /* defined(REAL_DMA) */
2133 NCR5380_transfer_pio(instance, &phase,
2134 (int *) &cmd->SCp.this_residual, (unsigned char **)
2137 /* if we had intended to dma that command clear it */
2138 if(sun3_dma_setup_done == cmd)
2139 sun3_dma_setup_done = NULL;
2146 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
2147 NCR5380_transfer_pio(instance, &phase, &len, &data);
2148 cmd->SCp.Message = tmp;
2152 * Linking lets us reduce the time required to get the
2153 * next command out to the device, hopefully this will
2154 * mean we don't waste another revolution due to the delays
2155 * required by ARBITRATION and another SELECTION.
2157 * In the current implementation proposal, low level drivers
2158 * merely have to start the next command, pointed to by
2159 * next_link, done() is called as with unlinked commands.
2162 case LINKED_CMD_COMPLETE:
2163 case LINKED_FLG_CMD_COMPLETE:
2164 /* Accept message by clearing ACK */
2165 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2167 LNK_PRINTK("scsi%d: target %d lun %d linked command "
2168 "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);
2170 /* Enable reselect interrupts */
2171 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2173 * Sanity check : A linked command should only terminate
2174 * with one of these messages if there are more linked
2175 * commands available.
2178 if (!cmd->next_link) {
2179 printk(KERN_NOTICE "scsi%d: target %d lun %d "
2180 "linked command complete, no next_link\n",
2181 HOSTNO, cmd->device->id, cmd->device->lun);
2183 do_abort (instance);
2187 initialize_SCp(cmd->next_link);
2188 /* The next command is still part of this process; copy it
2189 * and don't free it! */
2190 cmd->next_link->tag = cmd->tag;
2191 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2192 LNK_PRINTK("scsi%d: target %d lun %d linked request "
2193 "done, calling scsi_done().\n",
2194 HOSTNO, cmd->device->id, cmd->device->lun);
2195 #ifdef NCR5380_STATS
2196 collect_stats(hostdata, cmd);
2198 cmd->scsi_done(cmd);
2199 cmd = hostdata->connected;
2201 #endif /* def LINKED */
2203 case COMMAND_COMPLETE:
2204 /* Accept message by clearing ACK */
2205 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2206 hostdata->connected = NULL;
2207 QU_PRINTK("scsi%d: command for target %d, lun %d "
2208 "completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
2210 cmd_free_tag( cmd );
2211 if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
2212 /* Turn a QUEUE FULL status into BUSY, I think the
2213 * mid level cannot handle QUEUE FULL :-( (The
2214 * command is retried after BUSY). Also update our
2215 * queue size to the number of currently issued
2218 /* ++Andreas: the mid level code knows about
2220 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
2221 TAG_PRINTK("scsi%d: target %d lun %d returned "
2222 "QUEUE_FULL after %d commands\n",
2223 HOSTNO, cmd->device->id, cmd->device->lun,
2225 if (ta->queue_size > ta->nr_allocated)
2226 ta->nr_allocated = ta->queue_size;
2229 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2231 /* Enable reselect interrupts */
2232 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2235 * I'm not sure what the correct thing to do here is :
2237 * If the command that just executed is NOT a request
2238 * sense, the obvious thing to do is to set the result
2239 * code to the values of the stored parameters.
2241 * If it was a REQUEST SENSE command, we need some way to
2242 * differentiate between the failure code of the original
2243 * and the failure code of the REQUEST sense - the obvious
2244 * case is success, where we fall through and leave the
2245 * result code unchanged.
2247 * The non-obvious place is where the REQUEST SENSE failed
2250 if (cmd->cmnd[0] != REQUEST_SENSE)
2251 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2252 else if (status_byte(cmd->SCp.Status) != GOOD)
2253 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2256 if ((cmd->cmnd[0] == REQUEST_SENSE) &&
2257 hostdata->ses.cmd_len) {
2258 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
2259 hostdata->ses.cmd_len = 0 ;
2262 if ((cmd->cmnd[0] != REQUEST_SENSE) &&
2263 (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2264 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
2265 ASEN_PRINTK("scsi%d: performing request sense\n",
2267 /* this is initialized from initialize_SCp
2268 cmd->SCp.buffer = NULL;
2269 cmd->SCp.buffers_residual = 0;
2272 local_irq_save(flags);
2273 LIST(cmd,hostdata->issue_queue);
2274 NEXT(cmd) = hostdata->issue_queue;
2275 hostdata->issue_queue = (struct scsi_cmnd *) cmd;
2276 local_irq_restore(flags);
2277 QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
2278 "issue queue\n", H_NO(cmd));
2280 #endif /* def AUTOSENSE */
2282 #ifdef NCR5380_STATS
2283 collect_stats(hostdata, cmd);
2285 cmd->scsi_done(cmd);
2288 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2290 * Restore phase bits to 0 so an interrupted selection,
2291 * arbitration can resume.
2293 NCR5380_write(TARGET_COMMAND_REG, 0);
2295 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2299 case MESSAGE_REJECT:
2300 /* Accept message by clearing ACK */
2301 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2302 /* Enable reselect interrupts */
2303 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2304 switch (hostdata->last_message) {
2305 case HEAD_OF_QUEUE_TAG:
2306 case ORDERED_QUEUE_TAG:
2307 case SIMPLE_QUEUE_TAG:
2308 /* The target obviously doesn't support tagged
2309 * queuing, even though it announced this ability in
2310 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2311 * clear 'tagged_supported' and lock the LUN, since
2312 * the command is treated as untagged further on.
2314 cmd->device->tagged_supported = 0;
2315 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2316 cmd->tag = TAG_NONE;
2317 TAG_PRINTK("scsi%d: target %d lun %d rejected "
2318 "QUEUE_TAG message; tagged queuing "
2320 HOSTNO, cmd->device->id, cmd->device->lun);
2325 /* Accept message by clearing ACK */
2326 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2327 local_irq_save(flags);
2328 cmd->device->disconnect = 1;
2329 LIST(cmd,hostdata->disconnected_queue);
2330 NEXT(cmd) = hostdata->disconnected_queue;
2331 hostdata->connected = NULL;
2332 hostdata->disconnected_queue = cmd;
2333 local_irq_restore(flags);
2334 QU_PRINTK("scsi%d: command for target %d lun %d was "
2335 "moved from connected to the "
2336 "disconnected_queue\n", HOSTNO,
2337 cmd->device->id, cmd->device->lun);
2339 * Restore phase bits to 0 so an interrupted selection,
2340 * arbitration can resume.
2342 NCR5380_write(TARGET_COMMAND_REG, 0);
2344 /* Enable reselect interrupts */
2345 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2346 /* Wait for bus free to avoid nasty timeouts */
2347 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2349 #ifdef SUN3_SCSI_VME
2350 dregs->csr |= CSR_DMA_ENABLE;
2354 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2355 * operation, in violation of the SCSI spec so we can safely
2356 * ignore SAVE/RESTORE pointers calls.
2358 * Unfortunately, some disks violate the SCSI spec and
2359 * don't issue the required SAVE_POINTERS message before
2360 * disconnecting, and we have to break spec to remain
2364 case RESTORE_POINTERS:
2365 /* Accept message by clearing ACK */
2366 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2367 /* Enable reselect interrupts */
2368 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2370 case EXTENDED_MESSAGE:
2372 * Extended messages are sent in the following format :
2374 * 0 EXTENDED_MESSAGE == 1
2375 * 1 length (includes one byte for code, doesn't
2376 * include first two bytes)
2378 * 3..length+1 arguments
2380 * Start the extended message buffer with the EXTENDED_MESSAGE
2381 * byte, since spi_print_msg() wants the whole thing.
2383 extended_msg[0] = EXTENDED_MESSAGE;
2384 /* Accept first byte by clearing ACK */
2385 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2387 EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
2390 data = extended_msg + 1;
2391 phase = PHASE_MSGIN;
2392 NCR5380_transfer_pio(instance, &phase, &len, &data);
2393 EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2394 (int)extended_msg[1], (int)extended_msg[2]);
2396 if (!len && extended_msg[1] <=
2397 (sizeof (extended_msg) - 1)) {
2398 /* Accept third byte by clearing ACK */
2399 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2400 len = extended_msg[1] - 1;
2401 data = extended_msg + 3;
2402 phase = PHASE_MSGIN;
2404 NCR5380_transfer_pio(instance, &phase, &len, &data);
2405 EXT_PRINTK("scsi%d: message received, residual %d\n",
2408 switch (extended_msg[2]) {
2411 case EXTENDED_MODIFY_DATA_POINTER:
2412 case EXTENDED_EXTENDED_IDENTIFY:
2416 printk(KERN_NOTICE "scsi%d: error receiving "
2417 "extended message\n", HOSTNO);
2420 printk(KERN_NOTICE "scsi%d: extended message "
2421 "code %02x length %d is too long\n",
2422 HOSTNO, extended_msg[2], extended_msg[1]);
2425 /* Fall through to reject message */
2428 * If we get something weird that we aren't expecting,
2433 printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
2434 spi_print_msg(extended_msg);
2436 } else if (tmp != EXTENDED_MESSAGE)
2437 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2438 "message %02x from target %d, lun %d\n",
2439 HOSTNO, tmp, cmd->device->id, cmd->device->lun);
2441 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2443 "code %02x, length %d from target %d, lun %d\n",
2444 HOSTNO, extended_msg[1], extended_msg[0],
2445 cmd->device->id, cmd->device->lun);
2448 msgout = MESSAGE_REJECT;
2449 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2452 } /* switch (tmp) */
2457 hostdata->last_message = msgout;
2458 NCR5380_transfer_pio(instance, &phase, &len, &data);
2459 if (msgout == ABORT) {
2461 cmd_free_tag( cmd );
2463 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2465 hostdata->connected = NULL;
2466 cmd->result = DID_ERROR << 16;
2467 #ifdef NCR5380_STATS
2468 collect_stats(hostdata, cmd);
2470 cmd->scsi_done(cmd);
2471 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2480 * XXX for performance reasons, on machines with a
2481 * PSEUDO-DMA architecture we should probably
2482 * use the dma transfer function.
2484 NCR5380_transfer_pio(instance, &phase, &len,
2490 NCR5380_transfer_pio(instance, &phase, &len, &data);
2491 cmd->SCp.Status = tmp;
2494 printk("scsi%d: unknown phase\n", HOSTNO);
2495 NCR_PRINT(NDEBUG_ANY);
2496 } /* switch(phase) */
2497 } /* if (tmp * SR_REQ) */
2502 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2504 * Purpose : does reselection, initializing the instance->connected
2505 * field to point to the struct scsi_cmnd for which the I_T_L or I_T_L_Q
2506 * nexus has been reestablished,
2508 * Inputs : instance - this instance of the NCR5380.
2512 /* it might eventually prove necessary to do a dma setup on
2513 reselection, but it doesn't seem to be needed now -- sam */
2515 static void NCR5380_reselect (struct Scsi_Host *instance)
2517 SETUP_HOSTDATA(instance);
2518 unsigned char target_mask;
2523 unsigned char msg[3];
2524 struct scsi_cmnd *tmp = NULL, *prev;
2525 /* unsigned long flags; */
2528 * Disable arbitration, etc. since the host adapter obviously
2529 * lost, and tell an interrupted NCR5380_select() to restart.
2532 NCR5380_write(MODE_REG, MR_BASE);
2533 hostdata->restart_select = 1;
2535 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2537 RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
2540 * At this point, we have detected that our SCSI ID is on the bus,
2541 * SEL is true and BSY was false for at least one bus settle delay
2544 * We must assert BSY ourselves, until the target drops the SEL
2548 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2550 while (NCR5380_read(STATUS_REG) & SR_SEL);
2551 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2554 * Wait for target to go into MSGIN.
2557 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
2560 // acknowledge toggle to MSGIN
2561 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN));
2563 // peek at the byte without really hitting the bus
2564 msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG);
2567 if (!(msg[0] & 0x80)) {
2568 printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
2573 lun = (msg[0] & 0x07);
2576 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2577 * just reestablished, and remove it from the disconnected queue.
2580 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL;
2581 tmp; prev = tmp, tmp = NEXT(tmp) ) {
2582 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2584 && (tag == tmp->tag)
2588 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
2589 NEXT(prev) = NEXT(tmp);
2591 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2592 hostdata->disconnected_queue = NEXT(tmp);
2600 printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
2604 "not in disconnected_queue.\n",
2605 HOSTNO, target_mask, lun
2611 * Since we have an established nexus that we can't do anything
2612 * with, we must abort it.
2618 /* engage dma setup for the command we just saw */
2621 unsigned long count;
2623 if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) {
2624 count = tmp->SCp.buffer->length;
2625 d = SGADDR(tmp->SCp.buffer);
2627 count = tmp->SCp.this_residual;
2631 /* setup this command for dma if not already */
2632 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done != tmp))
2634 sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request));
2635 sun3_dma_setup_done = tmp;
2641 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
2642 /* Accept message by clearing ACK */
2643 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2646 /* If the phase is still MSGIN, the target wants to send some more
2647 * messages. In case it supports tagged queuing, this is probably a
2648 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2651 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2652 /* Accept previous IDENTIFY message by clearing ACK */
2653 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2656 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2657 msg[1] == SIMPLE_QUEUE_TAG)
2659 TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
2660 "reselection\n", HOSTNO, target_mask, lun, tag);
2664 hostdata->connected = tmp;
2665 RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2666 HOSTNO, tmp->target, tmp->lun, tmp->tag);
2671 * Function : int NCR5380_abort(struct scsi_cmnd *cmd)
2673 * Purpose : abort a command
2675 * Inputs : cmd - the struct scsi_cmnd to abort, code - code to set the
2676 * host byte of the result field to, if zero DID_ABORTED is
2679 * Returns : 0 - success, -1 on failure.
2681 * XXX - there is no way to abort the command that is currently
2682 * connected, you have to wait for it to complete. If this is
2683 * a problem, we could implement longjmp() / setjmp(), setjmp()
2684 * called where the loop started in NCR5380_main().
2687 static int NCR5380_abort(struct scsi_cmnd *cmd)
2689 struct Scsi_Host *instance = cmd->device->host;
2690 SETUP_HOSTDATA(instance);
2691 struct scsi_cmnd *tmp, **prev;
2692 unsigned long flags;
2694 printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
2695 scsi_print_command(cmd);
2697 NCR5380_print_status (instance);
2699 local_irq_save(flags);
2701 ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
2702 NCR5380_read(BUS_AND_STATUS_REG),
2703 NCR5380_read(STATUS_REG));
2707 * Case 1 : If the command is the currently executing command,
2708 * we'll set the aborted flag and return control so that
2709 * information transfer routine can exit cleanly.
2712 if (hostdata->connected == cmd) {
2714 ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO);
2716 * We should perform BSY checking, and make sure we haven't slipped
2720 /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2722 * Since we can't change phases until we've completed the current
2723 * handshake, we have to source or sink a byte of data if the current
2724 * phase is not MSGOUT.
2728 * Return control to the executing NCR drive so we can clear the
2729 * aborted flag and get back into our main loop.
2732 if (do_abort(instance) == 0) {
2733 hostdata->aborted = 1;
2734 hostdata->connected = NULL;
2735 cmd->result = DID_ABORT << 16;
2737 cmd_free_tag( cmd );
2739 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2741 local_irq_restore(flags);
2742 cmd->scsi_done(cmd);
2743 return SCSI_ABORT_SUCCESS;
2745 /* local_irq_restore(flags); */
2746 printk("scsi%d: abort of connected command failed!\n", HOSTNO);
2747 return SCSI_ABORT_ERROR;
2753 * Case 2 : If the command hasn't been issued yet, we simply remove it
2754 * from the issue queue.
2756 for (prev = (struct scsi_cmnd **) &(hostdata->issue_queue),
2757 tmp = (struct scsi_cmnd *) hostdata->issue_queue;
2758 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp))
2760 REMOVE(5, *prev, tmp, NEXT(tmp));
2761 (*prev) = NEXT(tmp);
2763 tmp->result = DID_ABORT << 16;
2764 local_irq_restore(flags);
2765 ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
2767 /* Tagged queuing note: no tag to free here, hasn't been assigned
2769 tmp->scsi_done(tmp);
2770 return SCSI_ABORT_SUCCESS;
2774 * Case 3 : If any commands are connected, we're going to fail the abort
2775 * and let the high level SCSI driver retry at a later time or
2778 * Timeouts, and therefore aborted commands, will be highly unlikely
2779 * and handling them cleanly in this situation would make the common
2780 * case of noresets less efficient, and would pollute our code. So,
2784 if (hostdata->connected) {
2785 local_irq_restore(flags);
2786 ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
2787 return SCSI_ABORT_SNOOZE;
2791 * Case 4: If the command is currently disconnected from the bus, and
2792 * there are no connected commands, we reconnect the I_T_L or
2793 * I_T_L_Q nexus associated with it, go into message out, and send
2796 * This case is especially ugly. In order to reestablish the nexus, we
2797 * need to call NCR5380_select(). The easiest way to implement this
2798 * function was to abort if the bus was busy, and let the interrupt
2799 * handler triggered on the SEL for reselect take care of lost arbitrations
2800 * where necessary, meaning interrupts need to be enabled.
2802 * When interrupts are enabled, the queues may change - so we
2803 * can't remove it from the disconnected queue before selecting it
2804 * because that could cause a failure in hashing the nexus if that
2805 * device reselected.
2807 * Since the queues may change, we can't use the pointers from when we
2810 * So, we must first locate the command, and if NCR5380_select()
2811 * succeeds, then issue the abort, relocate the command and remove
2812 * it from the disconnected queue.
2815 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp;
2818 local_irq_restore(flags);
2819 ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
2821 if (NCR5380_select (instance, cmd, (int) cmd->tag))
2822 return SCSI_ABORT_BUSY;
2824 ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
2826 do_abort (instance);
2828 local_irq_save(flags);
2829 for (prev = (struct scsi_cmnd **) &(hostdata->disconnected_queue),
2830 tmp = (struct scsi_cmnd *) hostdata->disconnected_queue;
2831 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
2833 REMOVE(5, *prev, tmp, NEXT(tmp));
2836 tmp->result = DID_ABORT << 16;
2837 /* We must unlock the tag/LUN immediately here, since the
2838 * target goes to BUS FREE and doesn't send us another
2839 * message (COMMAND_COMPLETE or the like)
2842 cmd_free_tag( tmp );
2844 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2846 local_irq_restore(flags);
2847 tmp->scsi_done(tmp);
2848 return SCSI_ABORT_SUCCESS;
2853 * Case 5 : If we reached this point, the command was not found in any of
2856 * We probably reached this point because of an unlikely race condition
2857 * between the command completing successfully and the abortion code,
2858 * so we won't panic, but we will notify the user in case something really
2862 local_irq_restore(flags);
2863 printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO);
2865 return SCSI_ABORT_NOT_RUNNING;
2870 * Function : int NCR5380_bus_reset(struct scsi_cmnd *cmd)
2872 * Purpose : reset the SCSI bus.
2874 * Returns : SCSI_RESET_WAKEUP
2878 static int NCR5380_bus_reset(struct scsi_cmnd *cmd)
2880 SETUP_HOSTDATA(cmd->device->host);
2882 unsigned long flags;
2884 struct scsi_cmnd *connected, *disconnected_queue;
2888 NCR5380_print_status (cmd->device->host);
2891 NCR5380_write( TARGET_COMMAND_REG,
2892 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
2894 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
2896 /* reset NCR registers */
2897 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2898 NCR5380_write( MODE_REG, MR_BASE );
2899 NCR5380_write( TARGET_COMMAND_REG, 0 );
2900 NCR5380_write( SELECT_ENABLE_REG, 0 );
2901 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2902 * through anymore ... */
2903 (void)NCR5380_read( RESET_PARITY_INTERRUPT_REG );
2905 #if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
2906 /* XXX see below XXX */
2908 /* MSch: old-style reset: actually abort all command processing here */
2910 /* After the reset, there are no more connected or disconnected commands
2911 * and no busy units; to avoid problems with re-inserting the commands
2912 * into the issue_queue (via scsi_done()), the aborted commands are
2913 * remembered in local variables first.
2915 local_irq_save(flags);
2916 connected = (struct scsi_cmnd *)hostdata->connected;
2917 hostdata->connected = NULL;
2918 disconnected_queue = (struct scsi_cmnd *)hostdata->disconnected_queue;
2919 hostdata->disconnected_queue = NULL;
2923 for( i = 0; i < 8; ++i )
2924 hostdata->busy[i] = 0;
2926 hostdata->dma_len = 0;
2928 local_irq_restore(flags);
2930 /* In order to tell the mid-level code which commands were aborted,
2931 * set the command status to DID_RESET and call scsi_done() !!!
2932 * This ultimately aborts processing of these commands in the mid-level.
2935 if ((cmd = connected)) {
2936 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2937 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2938 cmd->scsi_done( cmd );
2941 for (i = 0; (cmd = disconnected_queue); ++i) {
2942 disconnected_queue = NEXT(cmd);
2944 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2945 cmd->scsi_done( cmd );
2948 ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
2951 /* since all commands have been explicitly terminated, we need to tell
2952 * the midlevel code that the reset was SUCCESSFUL, and there is no
2953 * need to 'wake up' the commands by a request_sense
2955 return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
2958 /* MSch: new-style reset handling: let the mid-level do what it can */
2960 /* ++guenther: MID-LEVEL IS STILL BROKEN.
2961 * Mid-level is supposed to requeue all commands that were active on the
2962 * various low-level queues. In fact it does this, but that's not enough
2963 * because all these commands are subject to timeout. And if a timeout
2964 * happens for any removed command, *_abort() is called but all queues
2965 * are now empty. Abort then gives up the falcon lock, which is fatal,
2966 * since the mid-level will queue more commands and must have the lock
2967 * (it's all happening inside timer interrupt handler!!).
2968 * Even worse, abort will return NOT_RUNNING for all those commands not
2969 * on any queue, so they won't be retried ...
2971 * Conclusion: either scsi.c disables timeout for all resetted commands
2972 * immediately, or we lose! As of linux-2.0.20 it doesn't.
2975 /* After the reset, there are no more connected or disconnected commands
2976 * and no busy units; so clear the low-level status here to avoid
2977 * conflicts when the mid-level code tries to wake up the affected
2981 if (hostdata->issue_queue)
2982 ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
2983 if (hostdata->connected)
2984 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2985 if (hostdata->disconnected_queue)
2986 ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
2988 local_irq_save(flags);
2989 hostdata->issue_queue = NULL;
2990 hostdata->connected = NULL;
2991 hostdata->disconnected_queue = NULL;
2995 for( i = 0; i < 8; ++i )
2996 hostdata->busy[i] = 0;
2998 hostdata->dma_len = 0;
3000 local_irq_restore(flags);
3002 /* we did no complete reset of all commands, so a wakeup is required */
3003 return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;
3007 /* Local Variables: */