2 * NCR 5380 generic driver routines. These should make it *trivial*
3 * to implement 5380 SCSI drivers under Linux with a non-trantor
6 * Note that these routines also work with NR53c400 family chips.
8 * Copyright 1993, Drew Eckhardt
10 * (Unix and Linux consulting and custom programming)
14 * DISTRIBUTION RELEASE 6.
16 * For more information, please consult
19 * SCSI Protocol Controller
22 * NCR Microelectronics
23 * 1635 Aeroplaza Drive
24 * Colorado Springs, CO 80916
30 * ++roman: To port the 5380 driver to the Atari, I had to do some changes in
33 * - Some of the debug statements were incorrect (undefined variables and the
34 * like). I fixed that.
36 * - In information_transfer(), I think a #ifdef was wrong. Looking at the
37 * possible DMA transfer size should also happen for REAL_DMA. I added this
38 * in the #if statement.
40 * - When using real DMA, information_transfer() should return in a DATAOUT
41 * phase after starting the DMA. It has nothing more to do.
43 * - The interrupt service routine should run main after end of DMA, too (not
44 * only after RESELECTION interrupts). Additionally, it should _not_ test
45 * for more interrupts after running main, since a DMA process may have
46 * been started and interrupts are turned on now. The new int could happen
47 * inside the execution of NCR5380_intr(), leading to recursive
50 * - I've added a function merge_contiguous_buffers() that tries to
51 * merge scatter-gather buffers that are located at contiguous
52 * physical addresses and can be processed with the same DMA setup.
53 * Since most scatter-gather operations work on a page (4K) of
54 * 4 buffers (1K), in more than 90% of all cases three interrupts and
55 * DMA setup actions are saved.
57 * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA
58 * and USLEEP, because these were messing up readability and will never be
59 * needed for Atari SCSI.
61 * - I've revised the NCR5380_main() calling scheme (relax the 'main_running'
62 * stuff), and 'main' is executed in a bottom half if awoken by an
65 * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..."
66 * constructs. In my eyes, this made the source rather unreadable, so I
67 * finally replaced that by the *_PRINTK() macros.
72 * Further development / testing that should be done :
73 * 1. Test linked command handling code after Eric is ready with
74 * the high level code.
76 #include <scsi/scsi_dbg.h>
77 #include <scsi/scsi_transport_spi.h>
79 #if (NDEBUG & NDEBUG_LISTS)
82 printk("LINE:%d Adding %p to %p\n", \
83 __LINE__, (void*)(x), (void*)(y)); \
87 #define REMOVE(w, x, y, z) \
89 printk("LINE:%d Removing: %p->%p %p->%p \n", \
90 __LINE__, (void*)(w), (void*)(x), \
91 (void*)(y), (void*)(z)); \
97 #define REMOVE(w,x,y,z)
108 * The other Linux SCSI drivers were written when Linux was Intel PC-only,
109 * and specifically for each board rather than each chip. This makes their
110 * adaptation to platforms like the Mac (Some of which use NCR5380's)
111 * more difficult than it has to be.
113 * Also, many of the SCSI drivers were written before the command queuing
114 * routines were implemented, meaning their implementations of queued
115 * commands were hacked on rather than designed in from the start.
117 * When I designed the Linux SCSI drivers I figured that
118 * while having two different SCSI boards in a system might be useful
119 * for debugging things, two of the same type wouldn't be used.
120 * Well, I was wrong and a number of users have mailed me about running
121 * multiple high-performance SCSI boards in a server.
123 * Finally, when I get questions from users, I have no idea what
124 * revision of my driver they are running.
126 * This driver attempts to address these problems :
127 * This is a generic 5380 driver. To use it on a different platform,
128 * one simply writes appropriate system specific macros (ie, data
129 * transfer - some PC's will use the I/O bus, 68K's must use
130 * memory mapped) and drops this file in their 'C' wrapper.
132 * As far as command queueing, two queues are maintained for
133 * each 5380 in the system - commands that haven't been issued yet,
134 * and commands that are currently executing. This means that an
135 * unlimited number of commands may be queued, letting
136 * more commands propagate from the higher driver levels giving higher
137 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
138 * allowing multiple commands to propagate all the way to a SCSI-II device
139 * while a command is already executing.
141 * To solve the multiple-boards-in-the-same-system problem,
142 * there is a separate instance structure for each instance
143 * of a 5380 in the system. So, multiple NCR5380 drivers will
144 * be able to coexist with appropriate changes to the high level
147 * A NCR5380_PUBLIC_REVISION macro is provided, with the release
148 * number (updated for each public release) printed by the
149 * NCR5380_print_options command, which should be called from the
150 * wrapper detect function, so that I know what release of the driver
153 * Issues specific to the NCR5380 :
155 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
156 * piece of hardware that requires you to sit in a loop polling for
157 * the REQ signal as long as you are connected. Some devices are
158 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
159 * while doing long seek operations.
161 * The workaround for this is to keep track of devices that have
162 * disconnected. If the device hasn't disconnected, for commands that
163 * should disconnect, we do something like
165 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
167 * Some tweaking of N and M needs to be done. An algorithm based
168 * on "time to data" would give the best results as long as short time
169 * to datas (ie, on the same track) were considered, however these
170 * broken devices are the exception rather than the rule and I'd rather
171 * spend my time optimizing for the normal case.
175 * At the heart of the design is a coroutine, NCR5380_main,
176 * which is started when not running by the interrupt handler,
177 * timer, and queue command function. It attempts to establish
178 * I_T_L or I_T_L_Q nexuses by removing the commands from the
179 * issue queue and calling NCR5380_select() if a nexus
180 * is not established.
182 * Once a nexus is established, the NCR5380_information_transfer()
183 * phase goes through the various phases as instructed by the target.
184 * if the target goes into MSG IN and sends a DISCONNECT message,
185 * the command structure is placed into the per instance disconnected
186 * queue, and NCR5380_main tries to find more work. If USLEEP
187 * was defined, and the target is idle for too long, the system
190 * If a command has disconnected, eventually an interrupt will trigger,
191 * calling NCR5380_intr() which will in turn call NCR5380_reselect
192 * to reestablish a nexus. This will run main if necessary.
194 * On command termination, the done function will be called as
197 * SCSI pointers are maintained in the SCp field of SCSI command
198 * structures, being initialized after the command is connected
199 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
200 * Note that in violation of the standard, an implicit SAVE POINTERS operation
201 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
206 * This file a skeleton Linux SCSI driver for the NCR 5380 series
207 * of chips. To use it, you write an architecture specific functions
208 * and macros and include this file in your driver.
210 * These macros control options :
211 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
212 * for commands that return with a CHECK CONDITION status.
214 * LINKED - if defined, linked commands are supported.
216 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
218 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
220 * These macros MUST be defined :
222 * NCR5380_read(register) - read from the specified register
224 * NCR5380_write(register, value) - write to the specific register
226 * Either real DMA *or* pseudo DMA may be implemented
228 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
229 * Note that the DMA setup functions should return the number of bytes
230 * that they were able to program the controller for.
232 * Also note that generic i386/PC versions of these macros are
233 * available as NCR5380_i386_dma_write_setup,
234 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
236 * NCR5380_dma_write_setup(instance, src, count) - initialize
237 * NCR5380_dma_read_setup(instance, dst, count) - initialize
238 * NCR5380_dma_residual(instance); - residual count
241 * NCR5380_pwrite(instance, src, count)
242 * NCR5380_pread(instance, dst, count);
244 * If nothing specific to this implementation needs doing (ie, with external
245 * hardware), you must also define
247 * NCR5380_queue_command
252 * to be the global entry points into the specific driver, ie
253 * #define NCR5380_queue_command t128_queue_command.
255 * If this is not done, the routines will be defined as static functions
256 * with the NCR5380* names and the user must provide a globally
257 * accessible wrapper function.
259 * The generic driver is initialized by calling NCR5380_init(instance),
260 * after setting the appropriate host specific fields and ID. If the
261 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
262 * possible) function may be used. Before the specific driver initialization
263 * code finishes, NCR5380_print_options should be called.
266 static struct Scsi_Host *first_instance = NULL;
267 static struct scsi_host_template *the_template = NULL;
269 /* Macros ease life... :-) */
270 #define SETUP_HOSTDATA(in) \
271 struct NCR5380_hostdata *hostdata = \
272 (struct NCR5380_hostdata *)(in)->hostdata
273 #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
275 #define NEXT(cmd) ((cmd)->host_scribble)
276 #define NEXTADDR(cmd) ((Scsi_Cmnd **)&((cmd)->host_scribble))
278 #define HOSTNO instance->host_no
279 #define H_NO(cmd) (cmd)->device->host->host_no
284 * Functions for handling tagged queuing
285 * =====================================
287 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
289 * Using consecutive numbers for the tags is no good idea in my eyes. There
290 * could be wrong re-usings if the counter (8 bit!) wraps and some early
291 * command has been preempted for a long time. My solution: a bitfield for
292 * remembering used tags.
294 * There's also the problem that each target has a certain queue size, but we
295 * cannot know it in advance :-( We just see a QUEUE_FULL status being
296 * returned. So, in this case, the driver internal queue size assumption is
297 * reduced to the number of active tags if QUEUE_FULL is returned by the
298 * target. The command is returned to the mid-level, but with status changed
299 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
302 * We're also not allowed running tagged commands as long as an untagged
303 * command is active. And REQUEST SENSE commands after a contingent allegiance
304 * condition _must_ be untagged. To keep track whether an untagged command has
305 * been issued, the host->busy array is still employed, as it is without
306 * support for tagged queuing.
308 * One could suspect that there are possible race conditions between
309 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
310 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
311 * which already guaranteed to be running at most once. It is also the only
312 * place where tags/LUNs are allocated. So no other allocation can slip
313 * between that pair, there could only happen a reselection, which can free a
314 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
315 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
318 /* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
320 #define TAG_NONE 0xff
323 DECLARE_BITMAP(allocated, MAX_TAGS);
328 static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */
331 static void __init init_tags(void)
336 if (!setup_use_tagged_queuing)
339 for (target = 0; target < 8; ++target) {
340 for (lun = 0; lun < 8; ++lun) {
341 ta = &TagAlloc[target][lun];
342 bitmap_zero(ta->allocated, MAX_TAGS);
343 ta->nr_allocated = 0;
344 /* At the beginning, assume the maximum queue size we could
345 * support (MAX_TAGS). This value will be decreased if the target
346 * returns QUEUE_FULL status.
348 ta->queue_size = MAX_TAGS;
354 /* Check if we can issue a command to this LUN: First see if the LUN is marked
355 * busy by an untagged command. If the command should use tagged queuing, also
356 * check that there is a free tag and the target's queue won't overflow. This
357 * function should be called with interrupts disabled to avoid race
361 static int is_lun_busy(Scsi_Cmnd *cmd, int should_be_tagged)
363 SETUP_HOSTDATA(cmd->device->host);
365 if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun))
367 if (!should_be_tagged ||
368 !setup_use_tagged_queuing || !cmd->device->tagged_supported)
370 if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >=
371 TagAlloc[cmd->device->id][cmd->device->lun].queue_size) {
372 TAG_PRINTK("scsi%d: target %d lun %d: no free tags\n",
373 H_NO(cmd), cmd->device->id, cmd->device->lun);
380 /* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
381 * must be called before!), or reserve the LUN in 'busy' if the command is
385 static void cmd_get_tag(Scsi_Cmnd *cmd, int should_be_tagged)
387 SETUP_HOSTDATA(cmd->device->host);
389 /* If we or the target don't support tagged queuing, allocate the LUN for
390 * an untagged command.
392 if (!should_be_tagged ||
393 !setup_use_tagged_queuing || !cmd->device->tagged_supported) {
395 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
396 TAG_PRINTK("scsi%d: target %d lun %d now allocated by untagged "
397 "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun);
399 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
401 cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS);
402 set_bit(cmd->tag, ta->allocated);
404 TAG_PRINTK("scsi%d: using tag %d for target %d lun %d "
405 "(now %d tags in use)\n",
406 H_NO(cmd), cmd->tag, cmd->device->id,
407 cmd->device->lun, ta->nr_allocated);
412 /* Mark the tag of command 'cmd' as free, or in case of an untagged command,
416 static void cmd_free_tag(Scsi_Cmnd *cmd)
418 SETUP_HOSTDATA(cmd->device->host);
420 if (cmd->tag == TAG_NONE) {
421 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
422 TAG_PRINTK("scsi%d: target %d lun %d untagged cmd finished\n",
423 H_NO(cmd), cmd->device->id, cmd->device->lun);
424 } else if (cmd->tag >= MAX_TAGS) {
425 printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
426 H_NO(cmd), cmd->tag);
428 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
429 clear_bit(cmd->tag, ta->allocated);
431 TAG_PRINTK("scsi%d: freed tag %d for target %d lun %d\n",
432 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun);
437 static void free_all_tags(void)
442 if (!setup_use_tagged_queuing)
445 for (target = 0; target < 8; ++target) {
446 for (lun = 0; lun < 8; ++lun) {
447 ta = &TagAlloc[target][lun];
448 bitmap_zero(ta->allocated, MAX_TAGS);
449 ta->nr_allocated = 0;
454 #endif /* SUPPORT_TAGS */
458 * Function: void merge_contiguous_buffers( Scsi_Cmnd *cmd )
460 * Purpose: Try to merge several scatter-gather requests into one DMA
461 * transfer. This is possible if the scatter buffers lie on
462 * physical contiguous addresses.
464 * Parameters: Scsi_Cmnd *cmd
465 * The command to work on. The first scatter buffer's data are
466 * assumed to be already transfered into ptr/this_residual.
469 static void merge_contiguous_buffers(Scsi_Cmnd *cmd)
471 unsigned long endaddr;
472 #if (NDEBUG & NDEBUG_MERGING)
473 unsigned long oldlen = cmd->SCp.this_residual;
477 for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1;
478 cmd->SCp.buffers_residual &&
479 virt_to_phys(page_address(cmd->SCp.buffer[1].page) +
480 cmd->SCp.buffer[1].offset) == endaddr;) {
481 MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
482 cmd->SCp.buffer[1].address, endaddr);
483 #if (NDEBUG & NDEBUG_MERGING)
487 --cmd->SCp.buffers_residual;
488 cmd->SCp.this_residual += cmd->SCp.buffer->length;
489 endaddr += cmd->SCp.buffer->length;
491 #if (NDEBUG & NDEBUG_MERGING)
492 if (oldlen != cmd->SCp.this_residual)
493 MER_PRINTK("merged %d buffers from %p, new length %08x\n",
494 cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
499 * Function : void initialize_SCp(Scsi_Cmnd *cmd)
501 * Purpose : initialize the saved data pointers for cmd to point to the
502 * start of the buffer.
504 * Inputs : cmd - Scsi_Cmnd structure to have pointers reset.
507 static inline void initialize_SCp(Scsi_Cmnd *cmd)
510 * Initialize the Scsi Pointer field so that all of the commands in the
511 * various queues are valid.
515 cmd->SCp.buffer = (struct scatterlist *)cmd->request_buffer;
516 cmd->SCp.buffers_residual = cmd->use_sg - 1;
517 cmd->SCp.ptr = (char *)page_address(cmd->SCp.buffer->page) +
518 cmd->SCp.buffer->offset;
519 cmd->SCp.this_residual = cmd->SCp.buffer->length;
520 /* ++roman: Try to merge some scatter-buffers if they are at
521 * contiguous physical addresses.
523 merge_contiguous_buffers(cmd);
525 cmd->SCp.buffer = NULL;
526 cmd->SCp.buffers_residual = 0;
527 cmd->SCp.ptr = (char *)cmd->request_buffer;
528 cmd->SCp.this_residual = cmd->request_bufflen;
532 #include <linux/delay.h>
539 { SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" },
540 { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" },
541 { SR_SEL, "SEL" }, {0, NULL}
543 {BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}
545 {ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
546 {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"},
547 {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"},
550 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"},
551 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR,
552 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"},
553 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
554 {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)
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"}
607 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
609 * Purpose : print the current SCSI phase for debugging purposes
611 * Input : instance - which NCR5380
614 static void NCR5380_print_phase(struct Scsi_Host *instance)
616 unsigned char status;
619 status = NCR5380_read(STATUS_REG);
620 if (!(status & SR_REQ))
621 printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
623 for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
624 (phases[i].value != (status & PHASE_MASK)); ++i)
626 printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name);
633 static inline void NCR5380_print(struct Scsi_Host *instance)
636 static inline void NCR5380_print_phase(struct Scsi_Host *instance)
643 * ++roman: New scheme of calling NCR5380_main()
645 * If we're not in an interrupt, we can call our main directly, it cannot be
646 * already running. Else, we queue it on a task queue, if not 'main_running'
647 * tells us that a lower level is already executing it. This way,
648 * 'main_running' needs not be protected in a special way.
650 * queue_main() is a utility function for putting our main onto the task
651 * queue, if main_running is false. It should be called only from a
652 * interrupt or bottom half.
655 #include <linux/workqueue.h>
656 #include <linux/interrupt.h>
658 static volatile int main_running;
659 static DECLARE_WORK(NCR5380_tqueue, (void (*)(void *))NCR5380_main, NULL);
661 static inline void queue_main(void)
664 /* If in interrupt and NCR5380_main() not already running,
665 queue it on the 'immediate' task queue, to be processed
666 immediately after the current interrupt processing has
668 schedule_work(&NCR5380_tqueue);
670 /* else: nothing to do: the running NCR5380_main() will pick up
671 any newly queued command. */
675 static inline void NCR5380_all_init(void)
679 INI_PRINTK("scsi : NCR5380_all_init()\n");
686 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
688 * Purpose : called by probe code indicating the NCR5380 driver
689 * options that were selected.
691 * Inputs : instance, pointer to this instance. Unused.
694 static void __init NCR5380_print_options(struct Scsi_Host *instance)
696 printk(" generic options"
707 " SCSI-2 TAGGED QUEUING"
710 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
714 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
716 * Purpose : print commands in the various queues, called from
717 * NCR5380_abort and NCR5380_debug to aid debugging.
719 * Inputs : instance, pointer to this instance.
722 static void NCR5380_print_status(struct Scsi_Host *instance)
728 NCR_PRINT(NDEBUG_ANY);
729 NCR_PRINT_PHASE(NDEBUG_ANY);
731 pr_bfr = (char *)__get_free_page(GFP_ATOMIC);
733 printk("NCR5380_print_status: no memory for print buffer\n");
736 len = NCR5380_proc_info(instance, pr_bfr, &start, 0, PAGE_SIZE, 0);
738 printk("\n%s\n", pr_bfr);
739 free_page((unsigned long)pr_bfr);
743 /******************************************/
745 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
747 * *buffer: I/O buffer
748 * **start: if inout == FALSE pointer into buffer where user read should start
749 * offset: current offset
750 * length: length of buffer
751 * hostno: Scsi_Host host_no
752 * inout: TRUE - user is writing; FALSE - user is reading
754 * Return the number of bytes read from or written
758 #define SPRINTF(fmt,args...) \
760 if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \
761 pos += sprintf(pos, fmt , ## args); \
763 static char *lprint_Scsi_Cmnd(Scsi_Cmnd *cmd, char *pos, char *buffer, int length);
765 static int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer,
766 char **start, off_t offset, int length, int inout)
769 struct NCR5380_hostdata *hostdata;
773 #define check_offset() \
775 if (pos - buffer < offset - begin) { \
776 begin += pos - buffer; \
781 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
783 if (inout) /* Has data been written to the file ? */
784 return -ENOSYS; /* Currently this is a no-op */
785 SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
787 local_irq_save(flags);
788 SPRINTF("NCR5380: coroutine is%s running.\n",
789 main_running ? "" : "n't");
791 if (!hostdata->connected)
792 SPRINTF("scsi%d: no currently connected command\n", HOSTNO);
794 pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected,
795 pos, buffer, length);
796 SPRINTF("scsi%d: issue_queue\n", HOSTNO);
798 for (ptr = (Scsi_Cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr)) {
799 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
803 SPRINTF("scsi%d: disconnected_queue\n", HOSTNO);
805 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
807 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
811 local_irq_restore(flags);
812 *start = buffer + (offset - begin);
813 if (pos - buffer < offset - begin)
815 else if (pos - buffer - (offset - begin) < length)
816 return pos - buffer - (offset - begin);
820 static char *lprint_Scsi_Cmnd(Scsi_Cmnd *cmd, char *pos, char *buffer, int length)
823 unsigned char *command;
824 SPRINTF("scsi%d: destination target %d, lun %d\n",
825 H_NO(cmd), cmd->device->id, cmd->device->lun);
826 SPRINTF(" command = ");
828 SPRINTF("%2d (0x%02x)", command[0], command[0]);
829 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
830 SPRINTF(" %02x", command[i]);
837 * Function : void NCR5380_init (struct Scsi_Host *instance)
839 * Purpose : initializes *instance and corresponding 5380 chip.
841 * Inputs : instance - instantiation of the 5380 driver.
843 * Notes : I assume that the host, hostno, and id bits have been
844 * set correctly. I don't care about the irq and other fields.
848 static int NCR5380_init(struct Scsi_Host *instance, int flags)
851 SETUP_HOSTDATA(instance);
855 hostdata->aborted = 0;
856 hostdata->id_mask = 1 << instance->this_id;
857 hostdata->id_higher_mask = 0;
858 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
859 if (i > hostdata->id_mask)
860 hostdata->id_higher_mask |= i;
861 for (i = 0; i < 8; ++i)
862 hostdata->busy[i] = 0;
866 #if defined (REAL_DMA)
867 hostdata->dma_len = 0;
869 hostdata->targets_present = 0;
870 hostdata->connected = NULL;
871 hostdata->issue_queue = NULL;
872 hostdata->disconnected_queue = NULL;
873 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
876 the_template = instance->hostt;
877 first_instance = instance;
881 if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1))
882 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
883 " without AUTOSENSE option, contingent allegiance conditions may\n"
884 " be incorrectly cleared.\n", HOSTNO);
885 #endif /* def AUTOSENSE */
887 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
888 NCR5380_write(MODE_REG, MR_BASE);
889 NCR5380_write(TARGET_COMMAND_REG, 0);
890 NCR5380_write(SELECT_ENABLE_REG, 0);
896 * our own old-style timeout update
899 * The strategy is to cause the timer code to call scsi_times_out()
900 * when the soonest timeout is pending.
901 * The arguments are used when we are queueing a new command, because
902 * we do not want to subtract the time used from this time, but when we
903 * set the timer, we want to take this value into account.
906 int atari_scsi_update_timeout(Scsi_Cmnd * SCset, int timeout)
911 * We are using the new error handling code to actually register/deregister
912 * timers for timeout.
915 if (!timer_pending(&SCset->eh_timeout))
918 rtn = SCset->eh_timeout.expires - jiffies;
921 del_timer(&SCset->eh_timeout);
922 SCset->eh_timeout.data = (unsigned long)NULL;
923 SCset->eh_timeout.expires = 0;
925 if (SCset->eh_timeout.data != (unsigned long)NULL)
926 del_timer(&SCset->eh_timeout);
927 SCset->eh_timeout.data = (unsigned long)SCset;
928 SCset->eh_timeout.expires = jiffies + timeout;
929 add_timer(&SCset->eh_timeout);
935 * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd,
936 * void (*done)(Scsi_Cmnd *))
938 * Purpose : enqueues a SCSI command
940 * Inputs : cmd - SCSI command, done - function called on completion, with
941 * a pointer to the command descriptor.
946 * cmd is added to the per instance issue_queue, with minor
947 * twiddling done to the host specific fields of cmd. If the
948 * main coroutine is not running, it is restarted.
952 static int NCR5380_queue_command(Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
954 SETUP_HOSTDATA(cmd->device->host);
958 // extern int update_timeout(Scsi_Cmnd * SCset, int timeout);
960 #if (NDEBUG & NDEBUG_NO_WRITE)
961 switch (cmd->cmnd[0]) {
964 printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
966 cmd->result = (DID_ERROR << 16);
970 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
974 if (!hostdata->connected && !hostdata->issue_queue &&
975 !hostdata->disconnected_queue) {
976 hostdata->timebase = jiffies;
979 # ifdef NCR5380_STAT_LIMIT
980 if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
982 switch (cmd->cmnd[0]) {
986 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
987 hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;
988 hostdata->pendingw++;
993 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
994 hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;
995 hostdata->pendingr++;
1001 * We use the host_scribble field as a pointer to the next command
1006 cmd->scsi_done = done;
1011 * Insert the cmd into the issue queue. Note that REQUEST SENSE
1012 * commands are added to the head of the queue since any command will
1013 * clear the contingent allegiance condition that exists and the
1014 * sense data is only guaranteed to be valid while the condition exists.
1017 local_irq_save(flags);
1018 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
1019 * Otherwise a running NCR5380_main may steal the lock.
1020 * Lock before actually inserting due to fairness reasons explained in
1021 * atari_scsi.c. If we insert first, then it's impossible for this driver
1022 * to release the lock.
1023 * Stop timer for this command while waiting for the lock, or timeouts
1024 * may happen (and they really do), and it's no good if the command doesn't
1025 * appear in any of the queues.
1026 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1027 * because also a timer int can trigger an abort or reset, which would
1028 * alter queues and touch the lock.
1031 oldto = atari_scsi_update_timeout(cmd, 0);
1033 atari_scsi_update_timeout(cmd, oldto);
1035 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
1036 LIST(cmd, hostdata->issue_queue);
1037 NEXT(cmd) = hostdata->issue_queue;
1038 hostdata->issue_queue = cmd;
1040 for (tmp = (Scsi_Cmnd *)hostdata->issue_queue;
1041 NEXT(tmp); tmp = NEXT(tmp))
1046 local_irq_restore(flags);
1048 QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd),
1049 (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
1051 /* If queue_command() is called from an interrupt (real one or bottom
1052 * half), we let queue_main() do the job of taking care about main. If it
1053 * is already running, this is a no-op, else main will be queued.
1055 * If we're not in an interrupt, we can call NCR5380_main()
1056 * unconditionally, because it cannot be already running.
1058 if (in_interrupt() || ((flags >> 8) & 7) >= 6)
1066 * Function : NCR5380_main (void)
1068 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1069 * be done on the NCR5380 host adapters in a system. Both
1070 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1071 * in case it is not running.
1073 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
1074 * reenable them. This prevents reentrancy and kernel stack overflow.
1077 static void NCR5380_main(void *bl)
1079 Scsi_Cmnd *tmp, *prev;
1080 struct Scsi_Host *instance = first_instance;
1081 struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
1083 unsigned long flags;
1086 * We run (with interrupts disabled) until we're sure that none of
1087 * the host adapters have anything that can be done, at which point
1088 * we set main_running to 0 and exit.
1090 * Interrupts are enabled before doing various other internal
1091 * instructions, after we've decided that we need to run through
1094 * this should prevent any race conditions.
1096 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1097 * because also a timer int can trigger an abort or reset, which can
1098 * alter queues and touch the Falcon lock.
1101 /* Tell int handlers main() is now already executing. Note that
1102 no races are possible here. If an int comes in before
1103 'main_running' is set here, and queues/executes main via the
1104 task queue, it doesn't do any harm, just this instance of main
1105 won't find any work left to do. */
1110 local_save_flags(flags);
1112 local_irq_disable(); /* Freeze request queues */
1115 if (!hostdata->connected) {
1116 MAIN_PRINTK("scsi%d: not connected\n", HOSTNO);
1118 * Search through the issue_queue for a command destined
1119 * for a target that's not busy.
1121 #if (NDEBUG & NDEBUG_LISTS)
1122 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL;
1123 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1125 /*printk("%p ", tmp);*/
1126 if ((tmp == prev) && tmp)
1128 /* else printk("\n"); */
1130 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue,
1131 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) {
1133 #if (NDEBUG & NDEBUG_LISTS)
1135 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
1136 tmp, tmp->device->id, hostdata->busy[tmp->device->id],
1139 /* When we find one, remove it from the issue queue. */
1140 /* ++guenther: possible race with Falcon locking */
1143 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
1145 !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))
1148 /* ++guenther: just to be sure, this must be atomic */
1149 local_irq_disable();
1151 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
1152 NEXT(prev) = NEXT(tmp);
1154 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1155 hostdata->issue_queue = NEXT(tmp);
1158 falcon_dont_release++;
1160 /* reenable interrupts after finding one */
1161 local_irq_restore(flags);
1164 * Attempt to establish an I_T_L nexus here.
1165 * On success, instance->hostdata->connected is set.
1166 * On failure, we must add the command back to the
1167 * issue queue so we can keep trying.
1169 MAIN_PRINTK("scsi%d: main(): command for target %d "
1170 "lun %d removed from issue_queue\n",
1171 HOSTNO, tmp->device->id, tmp->device->lun);
1173 * REQUEST SENSE commands are issued without tagged
1174 * queueing, even on SCSI-II devices because the
1175 * contingent allegiance condition exists for the
1178 /* ++roman: ...and the standard also requires that
1179 * REQUEST SENSE command are untagged.
1183 cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE);
1185 if (!NCR5380_select(instance, tmp,
1186 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
1188 falcon_dont_release--;
1189 /* release if target did not response! */
1190 falcon_release_lock_if_possible(hostdata);
1193 local_irq_disable();
1194 LIST(tmp, hostdata->issue_queue);
1195 NEXT(tmp) = hostdata->issue_queue;
1196 hostdata->issue_queue = tmp;
1200 falcon_dont_release--;
1201 local_irq_restore(flags);
1202 MAIN_PRINTK("scsi%d: main(): select() failed, "
1203 "returned to issue_queue\n", HOSTNO);
1204 if (hostdata->connected)
1207 } /* if target/lun/target queue is not busy */
1208 } /* for issue_queue */
1209 } /* if (!hostdata->connected) */
1211 if (hostdata->connected
1213 && !hostdata->dma_len
1216 local_irq_restore(flags);
1217 MAIN_PRINTK("scsi%d: main: performing information transfer\n",
1219 NCR5380_information_transfer(instance);
1220 MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
1225 /* Better allow ints _after_ 'main_running' has been cleared, else
1226 an interrupt could believe we'll pick up the work it left for
1227 us, but we won't see it anymore here... */
1229 local_irq_restore(flags);
1235 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1237 * Purpose : Called by interrupt handler when DMA finishes or a phase
1238 * mismatch occurs (which would finish the DMA transfer).
1240 * Inputs : instance - this instance of the NCR5380.
1244 static void NCR5380_dma_complete(struct Scsi_Host *instance)
1246 SETUP_HOSTDATA(instance);
1247 int transfered, saved_data = 0, overrun = 0, cnt, toPIO;
1248 unsigned char **data, p;
1249 volatile int *count;
1251 if (!hostdata->connected) {
1252 printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
1253 "no connected cmd\n", HOSTNO);
1257 if (atari_read_overruns) {
1258 p = hostdata->connected->SCp.phase;
1261 if ((NCR5380_read(BUS_AND_STATUS_REG) &
1262 (BASR_PHASE_MATCH|BASR_ACK)) ==
1263 (BASR_PHASE_MATCH|BASR_ACK)) {
1264 saved_data = NCR5380_read(INPUT_DATA_REG);
1266 DMA_PRINTK("scsi%d: read overrun handled\n", HOSTNO);
1271 DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1272 HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
1273 NCR5380_read(STATUS_REG));
1275 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1276 NCR5380_write(MODE_REG, MR_BASE);
1277 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1279 transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
1280 hostdata->dma_len = 0;
1282 data = (unsigned char **)&hostdata->connected->SCp.ptr;
1283 count = &hostdata->connected->SCp.this_residual;
1284 *data += transfered;
1285 *count -= transfered;
1287 if (atari_read_overruns) {
1288 if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) {
1289 cnt = toPIO = atari_read_overruns;
1291 DMA_PRINTK("Got an input overrun, using saved byte\n");
1292 *(*data)++ = saved_data;
1297 DMA_PRINTK("Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data);
1298 NCR5380_transfer_pio(instance, &p, &cnt, data);
1299 *count -= toPIO - cnt;
1303 #endif /* REAL_DMA */
1307 * Function : void NCR5380_intr (int irq)
1309 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1310 * from the disconnected queue, and restarting NCR5380_main()
1313 * Inputs : int irq, irq that caused this interrupt.
1317 static irqreturn_t NCR5380_intr(int irq, void *dev_id)
1319 struct Scsi_Host *instance = first_instance;
1320 int done = 1, handled = 0;
1323 INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
1325 /* Look for pending interrupts */
1326 basr = NCR5380_read(BUS_AND_STATUS_REG);
1327 INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
1328 /* dispatch to appropriate routine if found and done=0 */
1329 if (basr & BASR_IRQ) {
1330 NCR_PRINT(NDEBUG_INTR);
1331 if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
1334 INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
1335 NCR5380_reselect(instance);
1336 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1337 } else if (basr & BASR_PARITY_ERROR) {
1338 INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
1339 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1340 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1341 INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
1342 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1345 * The rest of the interrupt conditions can occur only during a
1349 #if defined(REAL_DMA)
1351 * We should only get PHASE MISMATCH and EOP interrupts if we have
1352 * DMA enabled, so do a sanity check based on the current setting
1353 * of the MODE register.
1356 if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
1357 ((basr & BASR_END_DMA_TRANSFER) ||
1358 !(basr & BASR_PHASE_MATCH))) {
1360 INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
1361 NCR5380_dma_complete( instance );
1365 #endif /* REAL_DMA */
1367 /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1368 if (basr & BASR_PHASE_MATCH)
1369 printk(KERN_NOTICE "scsi%d: unknown interrupt, "
1370 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1371 HOSTNO, basr, NCR5380_read(MODE_REG),
1372 NCR5380_read(STATUS_REG));
1373 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1375 } /* if !(SELECTION || PARITY) */
1377 } /* BASR & IRQ */ else {
1378 printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
1379 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
1380 NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
1381 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1385 INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
1386 /* Put a call to NCR5380_main() on the queue... */
1389 return IRQ_RETVAL(handled);
1392 #ifdef NCR5380_STATS
1393 static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd *cmd)
1395 # ifdef NCR5380_STAT_LIMIT
1396 if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
1398 switch (cmd->cmnd[0]) {
1402 hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
1403 /*hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;*/
1404 hostdata->pendingw--;
1409 hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
1410 /*hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;*/
1411 hostdata->pendingr--;
1418 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
1421 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1422 * including ARBITRATION, SELECTION, and initial message out for
1423 * IDENTIFY and queue messages.
1425 * Inputs : instance - instantiation of the 5380 driver on which this
1426 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1427 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1428 * the command that is presently connected.
1430 * Returns : -1 if selection could not execute for some reason,
1431 * 0 if selection succeeded or failed because the target
1435 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1436 * with registers as they should have been on entry - ie
1437 * SELECT_ENABLE will be set appropriately, the NCR5380
1438 * will cease to drive any SCSI bus signals.
1440 * If successful : I_T_L or I_T_L_Q nexus will be established,
1441 * instance->connected will be set to cmd.
1442 * SELECT interrupt will be disabled.
1444 * If failed (no target) : cmd->scsi_done() will be called, and the
1445 * cmd->result host byte set to DID_BAD_TARGET.
1448 static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd *cmd, int tag)
1450 SETUP_HOSTDATA(instance);
1451 unsigned char tmp[3], phase;
1452 unsigned char *data;
1454 unsigned long timeout;
1455 unsigned long flags;
1457 hostdata->restart_select = 0;
1458 NCR_PRINT(NDEBUG_ARBITRATION);
1459 ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO,
1463 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1464 * data bus during SELECTION.
1467 local_irq_save(flags);
1468 if (hostdata->connected) {
1469 local_irq_restore(flags);
1472 NCR5380_write(TARGET_COMMAND_REG, 0);
1475 * Start arbitration.
1478 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1479 NCR5380_write(MODE_REG, MR_ARBITRATE);
1481 local_irq_restore(flags);
1483 /* Wait for arbitration logic to complete */
1484 #if defined(NCR_TIMEOUT)
1486 unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
1488 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) &&
1489 time_before(jiffies, timeout) && !hostdata->connected)
1491 if (time_after_eq(jiffies, timeout)) {
1492 printk("scsi : arbitration timeout at %d\n", __LINE__);
1493 NCR5380_write(MODE_REG, MR_BASE);
1494 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1498 #else /* NCR_TIMEOUT */
1499 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) &&
1500 !hostdata->connected)
1504 ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
1506 if (hostdata->connected) {
1507 NCR5380_write(MODE_REG, MR_BASE);
1511 * The arbitration delay is 2.2us, but this is a minimum and there is
1512 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1513 * the integral nature of udelay().
1519 /* Check for lost arbitration */
1520 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1521 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1522 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1523 hostdata->connected) {
1524 NCR5380_write(MODE_REG, MR_BASE);
1525 ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1530 /* after/during arbitration, BSY should be asserted.
1531 IBM DPES-31080 Version S31Q works now */
1532 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1533 NCR5380_write(INITIATOR_COMMAND_REG,
1534 ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY);
1536 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1537 hostdata->connected) {
1538 NCR5380_write(MODE_REG, MR_BASE);
1539 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1540 ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1546 * Again, bus clear + bus settle time is 1.2us, however, this is
1547 * a minimum so we'll udelay ceil(1.2)
1550 #ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1551 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1557 if (hostdata->connected) {
1558 NCR5380_write(MODE_REG, MR_BASE);
1559 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1563 ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
1566 * Now that we have won arbitration, start Selection process, asserting
1567 * the host and target ID's on the SCSI bus.
1570 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
1573 * Raise ATN while SEL is true before BSY goes false from arbitration,
1574 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1575 * phase immediately after selection.
1578 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
1579 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
1580 NCR5380_write(MODE_REG, MR_BASE);
1583 * Reselect interrupts must be turned off prior to the dropping of BSY,
1584 * otherwise we will trigger an interrupt.
1587 if (hostdata->connected) {
1588 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1592 NCR5380_write(SELECT_ENABLE_REG, 0);
1595 * The initiator shall then wait at least two deskew delays and release
1598 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1601 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
1602 ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1605 * Something weird happens when we cease to drive BSY - looks
1606 * like the board/chip is letting us do another read before the
1607 * appropriate propagation delay has expired, and we're confusing
1608 * a BSY signal from ourselves as the target's response to SELECTION.
1610 * A small delay (the 'C++' frontend breaks the pipeline with an
1611 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1612 * tighter 'C' code breaks and requires this) solves the problem -
1613 * the 1 us delay is arbitrary, and only used because this delay will
1614 * be the same on other platforms and since it works here, it should
1617 * wingel suggests that this could be due to failing to wait
1623 SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
1626 * The SCSI specification calls for a 250 ms timeout for the actual
1630 timeout = jiffies + 25;
1633 * XXX very interesting - we're seeing a bounce where the BSY we
1634 * asserted is being reflected / still asserted (propagation delay?)
1635 * and it's detecting as true. Sigh.
1639 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1640 * IO while SEL is true. But again, there are some disks out the in the
1641 * world that do that nevertheless. (Somebody claimed that this announces
1642 * reselection capability of the target.) So we better skip that test and
1643 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
1646 while (time_before(jiffies, timeout) &&
1647 !(NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO)))
1650 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1651 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1652 NCR5380_reselect(instance);
1653 printk(KERN_ERR "scsi%d: reselection after won arbitration?\n",
1655 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1659 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY))
1664 * No less than two deskew delays after the initiator detects the
1665 * BSY signal is true, it shall release the SEL signal and may
1666 * change the DATA BUS. -wingel
1671 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1673 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1674 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1675 if (hostdata->targets_present & (1 << cmd->device->id)) {
1676 printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
1677 if (hostdata->restart_select)
1678 printk(KERN_NOTICE "\trestart select\n");
1679 NCR_PRINT(NDEBUG_ANY);
1680 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1683 cmd->result = DID_BAD_TARGET << 16;
1684 #ifdef NCR5380_STATS
1685 collect_stats(hostdata, cmd);
1690 cmd->scsi_done(cmd);
1691 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1692 SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
1693 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1697 hostdata->targets_present |= (1 << cmd->device->id);
1700 * Since we followed the SCSI spec, and raised ATN while SEL
1701 * was true but before BSY was false during selection, the information
1702 * transfer phase should be a MESSAGE OUT phase so that we can send the
1705 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1706 * message (2 bytes) with a tag ID that we increment with every command
1707 * until it wraps back to 0.
1709 * XXX - it turns out that there are some broken SCSI-II devices,
1710 * which claim to support tagged queuing but fail when more than
1711 * some number of commands are issued at once.
1714 /* Wait for start of REQ/ACK handshake */
1715 while (!(NCR5380_read(STATUS_REG) & SR_REQ))
1718 SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1719 HOSTNO, cmd->device->id);
1720 tmp[0] = IDENTIFY(1, cmd->device->lun);
1723 if (cmd->tag != TAG_NONE) {
1724 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1732 #endif /* SUPPORT_TAGS */
1734 /* Send message(s) */
1736 phase = PHASE_MSGOUT;
1737 NCR5380_transfer_pio(instance, &phase, &len, &data);
1738 SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
1739 /* XXX need to handle errors here */
1740 hostdata->connected = cmd;
1741 #ifndef SUPPORT_TAGS
1742 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1745 initialize_SCp(cmd);
1751 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1752 * unsigned char *phase, int *count, unsigned char **data)
1754 * Purpose : transfers data in given phase using polled I/O
1756 * Inputs : instance - instance of driver, *phase - pointer to
1757 * what phase is expected, *count - pointer to number of
1758 * bytes to transfer, **data - pointer to data pointer.
1760 * Returns : -1 when different phase is entered without transferring
1761 * maximum number of bytes, 0 if all bytes are transfered or exit
1764 * Also, *phase, *count, *data are modified in place.
1766 * XXX Note : handling for bus free may be useful.
1770 * Note : this code is not as quick as it could be, however it
1771 * IS 100% reliable, and for the actual data transfer where speed
1772 * counts, we will always do a pseudo DMA or DMA transfer.
1775 static int NCR5380_transfer_pio(struct Scsi_Host *instance,
1776 unsigned char *phase, int *count,
1777 unsigned char **data)
1779 register unsigned char p = *phase, tmp;
1780 register int c = *count;
1781 register unsigned char *d = *data;
1784 * The NCR5380 chip will only drive the SCSI bus when the
1785 * phase specified in the appropriate bits of the TARGET COMMAND
1786 * REGISTER match the STATUS REGISTER
1789 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1793 * Wait for assertion of REQ, after which the phase bits will be
1796 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ))
1799 HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
1801 /* Check for phase mismatch */
1802 if ((tmp & PHASE_MASK) != p) {
1803 PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
1804 NCR_PRINT_PHASE(NDEBUG_PIO);
1808 /* Do actual transfer from SCSI bus to / from memory */
1810 NCR5380_write(OUTPUT_DATA_REG, *d);
1812 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1817 * The SCSI standard suggests that in MSGOUT phase, the initiator
1818 * should drop ATN on the last byte of the message phase
1819 * after REQ has been asserted for the handshake but before
1820 * the initiator raises ACK.
1824 if (!((p & SR_MSG) && c > 1)) {
1825 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1826 NCR_PRINT(NDEBUG_PIO);
1827 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1828 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1830 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1831 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1832 NCR_PRINT(NDEBUG_PIO);
1833 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1834 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1837 NCR_PRINT(NDEBUG_PIO);
1838 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1841 while (NCR5380_read(STATUS_REG) & SR_REQ)
1844 HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
1847 * We have several special cases to consider during REQ/ACK handshaking :
1848 * 1. We were in MSGOUT phase, and we are on the last byte of the
1849 * message. ATN must be dropped as ACK is dropped.
1851 * 2. We are in a MSGIN phase, and we are on the last byte of the
1852 * message. We must exit with ACK asserted, so that the calling
1853 * code may raise ATN before dropping ACK to reject the message.
1855 * 3. ACK and ATN are clear and the target may proceed as normal.
1857 if (!(p == PHASE_MSGIN && c == 1)) {
1858 if (p == PHASE_MSGOUT && c > 1)
1859 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1861 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1865 PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
1869 tmp = NCR5380_read(STATUS_REG);
1870 /* The phase read from the bus is valid if either REQ is (already)
1871 * asserted or if ACK hasn't been released yet. The latter is the case if
1872 * we're in MSGIN and all wanted bytes have been received.
1874 if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
1875 *phase = tmp & PHASE_MASK;
1877 *phase = PHASE_UNKNOWN;
1879 if (!c || (*phase == p))
1886 * Function : do_abort (Scsi_Host *host)
1888 * Purpose : abort the currently established nexus. Should only be
1889 * called from a routine which can drop into a
1891 * Returns : 0 on success, -1 on failure.
1894 static int do_abort(struct Scsi_Host *host)
1896 unsigned char tmp, *msgptr, phase;
1899 /* Request message out phase */
1900 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1903 * Wait for the target to indicate a valid phase by asserting
1904 * REQ. Once this happens, we'll have either a MSGOUT phase
1905 * and can immediately send the ABORT message, or we'll have some
1906 * other phase and will have to source/sink data.
1908 * We really don't care what value was on the bus or what value
1909 * the target sees, so we just handshake.
1912 while (!(tmp = NCR5380_read(STATUS_REG)) & SR_REQ)
1915 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1917 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1918 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1920 while (NCR5380_read(STATUS_REG) & SR_REQ)
1922 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1928 phase = PHASE_MSGOUT;
1929 NCR5380_transfer_pio(host, &phase, &len, &msgptr);
1932 * If we got here, and the command completed successfully,
1933 * we're about to go into bus free state.
1936 return len ? -1 : 0;
1939 #if defined(REAL_DMA)
1941 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1942 * unsigned char *phase, int *count, unsigned char **data)
1944 * Purpose : transfers data in given phase using either real
1947 * Inputs : instance - instance of driver, *phase - pointer to
1948 * what phase is expected, *count - pointer to number of
1949 * bytes to transfer, **data - pointer to data pointer.
1951 * Returns : -1 when different phase is entered without transferring
1952 * maximum number of bytes, 0 if all bytes or transfered or exit
1955 * Also, *phase, *count, *data are modified in place.
1960 static int NCR5380_transfer_dma(struct Scsi_Host *instance,
1961 unsigned char *phase, int *count,
1962 unsigned char **data)
1964 SETUP_HOSTDATA(instance);
1965 register int c = *count;
1966 register unsigned char p = *phase;
1967 register unsigned char *d = *data;
1969 unsigned long flags;
1971 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1976 if (atari_read_overruns && (p & SR_IO))
1977 c -= atari_read_overruns;
1979 DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1980 HOSTNO, (p & SR_IO) ? "reading" : "writing",
1981 c, (p & SR_IO) ? "to" : "from", d);
1983 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1986 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
1987 #endif /* def REAL_DMA */
1990 /* On the Medusa, it is a must to initialize the DMA before
1991 * starting the NCR. This is also the cleaner way for the TT.
1993 local_irq_save(flags);
1994 hostdata->dma_len = (p & SR_IO) ?
1995 NCR5380_dma_read_setup(instance, d, c) :
1996 NCR5380_dma_write_setup(instance, d, c);
1997 local_irq_restore(flags);
2001 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
2003 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
2004 NCR5380_write(START_DMA_SEND_REG, 0);
2008 /* On the Falcon, the DMA setup must be done after the last */
2009 /* NCR access, else the DMA setup gets trashed!
2011 local_irq_save(flags);
2012 hostdata->dma_len = (p & SR_IO) ?
2013 NCR5380_dma_read_setup(instance, d, c) :
2014 NCR5380_dma_write_setup(instance, d, c);
2015 local_irq_restore(flags);
2019 #endif /* defined(REAL_DMA) */
2022 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
2024 * Purpose : run through the various SCSI phases and do as the target
2025 * directs us to. Operates on the currently connected command,
2026 * instance->connected.
2028 * Inputs : instance, instance for which we are doing commands
2030 * Side effects : SCSI things happen, the disconnected queue will be
2031 * modified if a command disconnects, *instance->connected will
2034 * XXX Note : we need to watch for bus free or a reset condition here
2035 * to recover from an unexpected bus free condition.
2038 static void NCR5380_information_transfer(struct Scsi_Host *instance)
2040 SETUP_HOSTDATA(instance);
2041 unsigned long flags;
2042 unsigned char msgout = NOP;
2045 #if defined(REAL_DMA)
2048 unsigned char *data;
2049 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
2050 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
2053 tmp = NCR5380_read(STATUS_REG);
2054 /* We only have a valid SCSI phase when REQ is asserted */
2056 phase = (tmp & PHASE_MASK);
2057 if (phase != old_phase) {
2059 NCR_PRINT_PHASE(NDEBUG_INFORMATION);
2062 if (sink && (phase != PHASE_MSGOUT)) {
2063 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2065 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
2067 while (NCR5380_read(STATUS_REG) & SR_REQ)
2069 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2077 #if (NDEBUG & NDEBUG_NO_DATAOUT)
2078 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2079 "aborted\n", HOSTNO);
2082 cmd->result = DID_ERROR << 16;
2088 * If there is no room left in the current buffer in the
2089 * scatter-gather list, move onto the next one.
2092 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2094 --cmd->SCp.buffers_residual;
2095 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2096 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page) +
2097 cmd->SCp.buffer->offset;
2098 /* ++roman: Try to merge some scatter-buffers if
2099 * they are at contiguous physical addresses.
2101 merge_contiguous_buffers(cmd);
2102 INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
2103 HOSTNO, cmd->SCp.this_residual,
2104 cmd->SCp.buffers_residual);
2108 * The preferred transfer method is going to be
2109 * PSEUDO-DMA for systems that are strictly PIO,
2110 * since we can let the hardware do the handshaking.
2112 * For this to work, we need to know the transfersize
2113 * ahead of time, since the pseudo-DMA code will sit
2114 * in an unconditional loop.
2117 /* ++roman: I suggest, this should be
2119 * instead of leaving REAL_DMA out.
2122 #if defined(REAL_DMA)
2123 if (!cmd->device->borken &&
2124 (transfersize = NCR5380_dma_xfer_len(instance,cmd,phase)) > 31) {
2126 cmd->SCp.phase = phase;
2127 if (NCR5380_transfer_dma(instance, &phase,
2128 &len, (unsigned char **)&cmd->SCp.ptr)) {
2130 * If the watchdog timer fires, all future
2131 * accesses to this device will use the
2133 printk(KERN_NOTICE "scsi%d: switching target %d "
2134 "lun %d to slow handshake\n", HOSTNO,
2135 cmd->device->id, cmd->device->lun);
2136 cmd->device->borken = 1;
2137 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2141 cmd->result = DID_ERROR << 16;
2143 /* XXX - need to source or sink data here, as appropriate */
2146 /* ++roman: When using real DMA,
2147 * information_transfer() should return after
2148 * starting DMA since it has nothing more to
2153 cmd->SCp.this_residual -= transfersize - len;
2157 #endif /* defined(REAL_DMA) */
2158 NCR5380_transfer_pio(instance, &phase,
2159 (int *)&cmd->SCp.this_residual,
2160 (unsigned char **)&cmd->SCp.ptr);
2165 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
2166 NCR5380_transfer_pio(instance, &phase, &len, &data);
2167 cmd->SCp.Message = tmp;
2171 * Linking lets us reduce the time required to get the
2172 * next command out to the device, hopefully this will
2173 * mean we don't waste another revolution due to the delays
2174 * required by ARBITRATION and another SELECTION.
2176 * In the current implementation proposal, low level drivers
2177 * merely have to start the next command, pointed to by
2178 * next_link, done() is called as with unlinked commands.
2181 case LINKED_CMD_COMPLETE:
2182 case LINKED_FLG_CMD_COMPLETE:
2183 /* Accept message by clearing ACK */
2184 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2186 LNK_PRINTK("scsi%d: target %d lun %d linked command "
2187 "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);
2189 /* Enable reselect interrupts */
2190 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2192 * Sanity check : A linked command should only terminate
2193 * with one of these messages if there are more linked
2194 * commands available.
2197 if (!cmd->next_link) {
2198 printk(KERN_NOTICE "scsi%d: target %d lun %d "
2199 "linked command complete, no next_link\n",
2200 HOSTNO, cmd->device->id, cmd->device->lun);
2206 initialize_SCp(cmd->next_link);
2207 /* The next command is still part of this process; copy it
2208 * and don't free it! */
2209 cmd->next_link->tag = cmd->tag;
2210 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2211 LNK_PRINTK("scsi%d: target %d lun %d linked request "
2212 "done, calling scsi_done().\n",
2213 HOSTNO, cmd->device->id, cmd->device->lun);
2214 #ifdef NCR5380_STATS
2215 collect_stats(hostdata, cmd);
2217 cmd->scsi_done(cmd);
2218 cmd = hostdata->connected;
2220 #endif /* def LINKED */
2222 case COMMAND_COMPLETE:
2223 /* Accept message by clearing ACK */
2224 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2225 /* ++guenther: possible race with Falcon locking */
2226 falcon_dont_release++;
2227 hostdata->connected = NULL;
2228 QU_PRINTK("scsi%d: command for target %d, lun %d "
2229 "completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
2232 if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
2233 /* Turn a QUEUE FULL status into BUSY, I think the
2234 * mid level cannot handle QUEUE FULL :-( (The
2235 * command is retried after BUSY). Also update our
2236 * queue size to the number of currently issued
2239 /* ++Andreas: the mid level code knows about
2241 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
2242 TAG_PRINTK("scsi%d: target %d lun %d returned "
2243 "QUEUE_FULL after %d commands\n",
2244 HOSTNO, cmd->device->id, cmd->device->lun,
2246 if (ta->queue_size > ta->nr_allocated)
2247 ta->nr_allocated = ta->queue_size;
2250 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2252 /* Enable reselect interrupts */
2253 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2256 * I'm not sure what the correct thing to do here is :
2258 * If the command that just executed is NOT a request
2259 * sense, the obvious thing to do is to set the result
2260 * code to the values of the stored parameters.
2262 * If it was a REQUEST SENSE command, we need some way to
2263 * differentiate between the failure code of the original
2264 * and the failure code of the REQUEST sense - the obvious
2265 * case is success, where we fall through and leave the
2266 * result code unchanged.
2268 * The non-obvious place is where the REQUEST SENSE failed
2271 if (cmd->cmnd[0] != REQUEST_SENSE)
2272 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2273 else if (status_byte(cmd->SCp.Status) != GOOD)
2274 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2277 if ((cmd->cmnd[0] != REQUEST_SENSE) &&
2278 (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2279 ASEN_PRINTK("scsi%d: performing request sense\n", HOSTNO);
2280 cmd->cmnd[0] = REQUEST_SENSE;
2281 cmd->cmnd[1] &= 0xe0;
2284 cmd->cmnd[4] = sizeof(cmd->sense_buffer);
2286 cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]);
2289 /* this is initialized from initialize_SCp
2290 cmd->SCp.buffer = NULL;
2291 cmd->SCp.buffers_residual = 0;
2293 cmd->request_buffer = (char *) cmd->sense_buffer;
2294 cmd->request_bufflen = sizeof(cmd->sense_buffer);
2296 local_irq_save(flags);
2297 LIST(cmd,hostdata->issue_queue);
2298 NEXT(cmd) = hostdata->issue_queue;
2299 hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2300 local_irq_restore(flags);
2301 QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
2302 "issue queue\n", H_NO(cmd));
2304 #endif /* def AUTOSENSE */
2306 #ifdef NCR5380_STATS
2307 collect_stats(hostdata, cmd);
2309 cmd->scsi_done(cmd);
2312 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2314 * Restore phase bits to 0 so an interrupted selection,
2315 * arbitration can resume.
2317 NCR5380_write(TARGET_COMMAND_REG, 0);
2319 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2322 falcon_dont_release--;
2323 /* ++roman: For Falcon SCSI, release the lock on the
2324 * ST-DMA here if no other commands are waiting on the
2325 * disconnected queue.
2327 falcon_release_lock_if_possible(hostdata);
2329 case MESSAGE_REJECT:
2330 /* Accept message by clearing ACK */
2331 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2332 /* Enable reselect interrupts */
2333 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2334 switch (hostdata->last_message) {
2335 case HEAD_OF_QUEUE_TAG:
2336 case ORDERED_QUEUE_TAG:
2337 case SIMPLE_QUEUE_TAG:
2338 /* The target obviously doesn't support tagged
2339 * queuing, even though it announced this ability in
2340 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2341 * clear 'tagged_supported' and lock the LUN, since
2342 * the command is treated as untagged further on.
2344 cmd->device->tagged_supported = 0;
2345 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2346 cmd->tag = TAG_NONE;
2347 TAG_PRINTK("scsi%d: target %d lun %d rejected "
2348 "QUEUE_TAG message; tagged queuing "
2350 HOSTNO, cmd->device->id, cmd->device->lun);
2355 /* Accept message by clearing ACK */
2356 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2357 local_irq_save(flags);
2358 cmd->device->disconnect = 1;
2359 LIST(cmd,hostdata->disconnected_queue);
2360 NEXT(cmd) = hostdata->disconnected_queue;
2361 hostdata->connected = NULL;
2362 hostdata->disconnected_queue = cmd;
2363 local_irq_restore(flags);
2364 QU_PRINTK("scsi%d: command for target %d lun %d was "
2365 "moved from connected to the "
2366 "disconnected_queue\n", HOSTNO,
2367 cmd->device->id, cmd->device->lun);
2369 * Restore phase bits to 0 so an interrupted selection,
2370 * arbitration can resume.
2372 NCR5380_write(TARGET_COMMAND_REG, 0);
2374 /* Enable reselect interrupts */
2375 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2376 /* Wait for bus free to avoid nasty timeouts */
2377 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2381 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2382 * operation, in violation of the SCSI spec so we can safely
2383 * ignore SAVE/RESTORE pointers calls.
2385 * Unfortunately, some disks violate the SCSI spec and
2386 * don't issue the required SAVE_POINTERS message before
2387 * disconnecting, and we have to break spec to remain
2391 case RESTORE_POINTERS:
2392 /* Accept message by clearing ACK */
2393 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2394 /* Enable reselect interrupts */
2395 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2397 case EXTENDED_MESSAGE:
2399 * Extended messages are sent in the following format :
2401 * 0 EXTENDED_MESSAGE == 1
2402 * 1 length (includes one byte for code, doesn't
2403 * include first two bytes)
2405 * 3..length+1 arguments
2407 * Start the extended message buffer with the EXTENDED_MESSAGE
2408 * byte, since spi_print_msg() wants the whole thing.
2410 extended_msg[0] = EXTENDED_MESSAGE;
2411 /* Accept first byte by clearing ACK */
2412 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2414 EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
2417 data = extended_msg + 1;
2418 phase = PHASE_MSGIN;
2419 NCR5380_transfer_pio(instance, &phase, &len, &data);
2420 EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2421 (int)extended_msg[1], (int)extended_msg[2]);
2423 if (!len && extended_msg[1] <=
2424 (sizeof(extended_msg) - 1)) {
2425 /* Accept third byte by clearing ACK */
2426 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2427 len = extended_msg[1] - 1;
2428 data = extended_msg + 3;
2429 phase = PHASE_MSGIN;
2431 NCR5380_transfer_pio(instance, &phase, &len, &data);
2432 EXT_PRINTK("scsi%d: message received, residual %d\n",
2435 switch (extended_msg[2]) {
2438 case EXTENDED_MODIFY_DATA_POINTER:
2439 case EXTENDED_EXTENDED_IDENTIFY:
2443 printk(KERN_NOTICE "scsi%d: error receiving "
2444 "extended message\n", HOSTNO);
2447 printk(KERN_NOTICE "scsi%d: extended message "
2448 "code %02x length %d is too long\n",
2449 HOSTNO, extended_msg[2], extended_msg[1]);
2452 /* Fall through to reject message */
2455 * If we get something weird that we aren't expecting,
2460 printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
2461 spi_print_msg(extended_msg);
2463 } else if (tmp != EXTENDED_MESSAGE)
2464 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2465 "message %02x from target %d, lun %d\n",
2466 HOSTNO, tmp, cmd->device->id, cmd->device->lun);
2468 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2470 "code %02x, length %d from target %d, lun %d\n",
2471 HOSTNO, extended_msg[1], extended_msg[0],
2472 cmd->device->id, cmd->device->lun);
2475 msgout = MESSAGE_REJECT;
2476 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2478 } /* switch (tmp) */
2483 hostdata->last_message = msgout;
2484 NCR5380_transfer_pio(instance, &phase, &len, &data);
2485 if (msgout == ABORT) {
2489 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2491 hostdata->connected = NULL;
2492 cmd->result = DID_ERROR << 16;
2493 #ifdef NCR5380_STATS
2494 collect_stats(hostdata, cmd);
2496 cmd->scsi_done(cmd);
2497 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2498 falcon_release_lock_if_possible(hostdata);
2507 * XXX for performance reasons, on machines with a
2508 * PSEUDO-DMA architecture we should probably
2509 * use the dma transfer function.
2511 NCR5380_transfer_pio(instance, &phase, &len, &data);
2516 NCR5380_transfer_pio(instance, &phase, &len, &data);
2517 cmd->SCp.Status = tmp;
2520 printk("scsi%d: unknown phase\n", HOSTNO);
2521 NCR_PRINT(NDEBUG_ANY);
2522 } /* switch(phase) */
2523 } /* if (tmp * SR_REQ) */
2528 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2530 * Purpose : does reselection, initializing the instance->connected
2531 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2532 * nexus has been reestablished,
2534 * Inputs : instance - this instance of the NCR5380.
2539 static void NCR5380_reselect(struct Scsi_Host *instance)
2541 SETUP_HOSTDATA(instance);
2542 unsigned char target_mask;
2543 unsigned char lun, phase;
2548 unsigned char msg[3];
2549 unsigned char *data;
2550 Scsi_Cmnd *tmp = NULL, *prev;
2551 /* unsigned long flags; */
2554 * Disable arbitration, etc. since the host adapter obviously
2555 * lost, and tell an interrupted NCR5380_select() to restart.
2558 NCR5380_write(MODE_REG, MR_BASE);
2559 hostdata->restart_select = 1;
2561 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2563 RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
2566 * At this point, we have detected that our SCSI ID is on the bus,
2567 * SEL is true and BSY was false for at least one bus settle delay
2570 * We must assert BSY ourselves, until the target drops the SEL
2574 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2576 while (NCR5380_read(STATUS_REG) & SR_SEL)
2578 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2581 * Wait for target to go into MSGIN.
2584 while (!(NCR5380_read(STATUS_REG) & SR_REQ))
2589 phase = PHASE_MSGIN;
2590 NCR5380_transfer_pio(instance, &phase, &len, &data);
2592 if (!(msg[0] & 0x80)) {
2593 printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
2598 lun = (msg[0] & 0x07);
2601 /* If the phase is still MSGIN, the target wants to send some more
2602 * messages. In case it supports tagged queuing, this is probably a
2603 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2606 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2607 /* Accept previous IDENTIFY message by clearing ACK */
2608 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2611 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2612 msg[1] == SIMPLE_QUEUE_TAG)
2614 TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
2615 "reselection\n", HOSTNO, target_mask, lun, tag);
2620 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2621 * just reestablished, and remove it from the disconnected queue.
2624 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL;
2625 tmp; prev = tmp, tmp = NEXT(tmp)) {
2626 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2628 && (tag == tmp->tag)
2631 /* ++guenther: prevent race with falcon_release_lock */
2632 falcon_dont_release++;
2634 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
2635 NEXT(prev) = NEXT(tmp);
2637 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2638 hostdata->disconnected_queue = NEXT(tmp);
2646 printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
2650 "not in disconnected_queue.\n",
2651 HOSTNO, target_mask, lun
2657 * Since we have an established nexus that we can't do anything
2658 * with, we must abort it.
2664 /* Accept message by clearing ACK */
2665 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2667 hostdata->connected = tmp;
2668 RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2669 HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag);
2670 falcon_dont_release--;
2675 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2677 * Purpose : abort a command
2679 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2680 * host byte of the result field to, if zero DID_ABORTED is
2683 * Returns : 0 - success, -1 on failure.
2685 * XXX - there is no way to abort the command that is currently
2686 * connected, you have to wait for it to complete. If this is
2687 * a problem, we could implement longjmp() / setjmp(), setjmp()
2688 * called where the loop started in NCR5380_main().
2692 int NCR5380_abort(Scsi_Cmnd *cmd)
2694 struct Scsi_Host *instance = cmd->device->host;
2695 SETUP_HOSTDATA(instance);
2696 Scsi_Cmnd *tmp, **prev;
2697 unsigned long flags;
2699 printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
2700 scsi_print_command(cmd);
2702 NCR5380_print_status(instance);
2704 local_irq_save(flags);
2706 if (!IS_A_TT() && !falcon_got_lock)
2707 printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_abort\n",
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;
2748 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2750 local_irq_restore(flags);
2751 cmd->scsi_done(cmd);
2752 falcon_release_lock_if_possible(hostdata);
2753 return SCSI_ABORT_SUCCESS;
2755 /* local_irq_restore(flags); */
2756 printk("scsi%d: abort of connected command failed!\n", HOSTNO);
2757 return SCSI_ABORT_ERROR;
2763 * Case 2 : If the command hasn't been issued yet, we simply remove it
2764 * from the issue queue.
2766 for (prev = (Scsi_Cmnd **)&(hostdata->issue_queue),
2767 tmp = (Scsi_Cmnd *)hostdata->issue_queue;
2768 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) {
2770 REMOVE(5, *prev, tmp, NEXT(tmp));
2771 (*prev) = NEXT(tmp);
2773 tmp->result = DID_ABORT << 16;
2774 local_irq_restore(flags);
2775 ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
2777 /* Tagged queuing note: no tag to free here, hasn't been assigned
2779 tmp->scsi_done(tmp);
2780 falcon_release_lock_if_possible(hostdata);
2781 return SCSI_ABORT_SUCCESS;
2786 * Case 3 : If any commands are connected, we're going to fail the abort
2787 * and let the high level SCSI driver retry at a later time or
2790 * Timeouts, and therefore aborted commands, will be highly unlikely
2791 * and handling them cleanly in this situation would make the common
2792 * case of noresets less efficient, and would pollute our code. So,
2796 if (hostdata->connected) {
2797 local_irq_restore(flags);
2798 ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
2799 return SCSI_ABORT_SNOOZE;
2803 * Case 4: If the command is currently disconnected from the bus, and
2804 * there are no connected commands, we reconnect the I_T_L or
2805 * I_T_L_Q nexus associated with it, go into message out, and send
2808 * This case is especially ugly. In order to reestablish the nexus, we
2809 * need to call NCR5380_select(). The easiest way to implement this
2810 * function was to abort if the bus was busy, and let the interrupt
2811 * handler triggered on the SEL for reselect take care of lost arbitrations
2812 * where necessary, meaning interrupts need to be enabled.
2814 * When interrupts are enabled, the queues may change - so we
2815 * can't remove it from the disconnected queue before selecting it
2816 * because that could cause a failure in hashing the nexus if that
2817 * device reselected.
2819 * Since the queues may change, we can't use the pointers from when we
2822 * So, we must first locate the command, and if NCR5380_select()
2823 * succeeds, then issue the abort, relocate the command and remove
2824 * it from the disconnected queue.
2827 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp;
2830 local_irq_restore(flags);
2831 ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
2833 if (NCR5380_select(instance, cmd, (int)cmd->tag))
2834 return SCSI_ABORT_BUSY;
2836 ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
2840 local_irq_save(flags);
2841 for (prev = (Scsi_Cmnd **)&(hostdata->disconnected_queue),
2842 tmp = (Scsi_Cmnd *)hostdata->disconnected_queue;
2843 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) {
2845 REMOVE(5, *prev, tmp, NEXT(tmp));
2848 tmp->result = DID_ABORT << 16;
2849 /* We must unlock the tag/LUN immediately here, since the
2850 * target goes to BUS FREE and doesn't send us another
2851 * message (COMMAND_COMPLETE or the like)
2856 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2858 local_irq_restore(flags);
2859 tmp->scsi_done(tmp);
2860 falcon_release_lock_if_possible(hostdata);
2861 return SCSI_ABORT_SUCCESS;
2868 * Case 5 : If we reached this point, the command was not found in any of
2871 * We probably reached this point because of an unlikely race condition
2872 * between the command completing successfully and the abortion code,
2873 * so we won't panic, but we will notify the user in case something really
2877 local_irq_restore(flags);
2878 printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully\n"
2879 KERN_INFO " before abortion\n", HOSTNO);
2881 /* Maybe it is sufficient just to release the ST-DMA lock... (if
2882 * possible at all) At least, we should check if the lock could be
2883 * released after the abort, in case it is kept due to some bug.
2885 falcon_release_lock_if_possible(hostdata);
2887 return SCSI_ABORT_NOT_RUNNING;
2892 * Function : int NCR5380_reset (Scsi_Cmnd *cmd)
2894 * Purpose : reset the SCSI bus.
2896 * Returns : SCSI_RESET_WAKEUP
2900 static int NCR5380_bus_reset(Scsi_Cmnd *cmd)
2902 SETUP_HOSTDATA(cmd->device->host);
2904 unsigned long flags;
2906 Scsi_Cmnd *connected, *disconnected_queue;
2909 if (!IS_A_TT() && !falcon_got_lock)
2910 printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_reset\n",
2913 NCR5380_print_status(cmd->device->host);
2916 NCR5380_write(TARGET_COMMAND_REG,
2917 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG)));
2919 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
2921 /* reset NCR registers */
2922 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2923 NCR5380_write(MODE_REG, MR_BASE);
2924 NCR5380_write(TARGET_COMMAND_REG, 0);
2925 NCR5380_write(SELECT_ENABLE_REG, 0);
2926 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2927 * through anymore ... */
2928 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
2930 #if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
2931 /* XXX see below XXX */
2933 /* MSch: old-style reset: actually abort all command processing here */
2935 /* After the reset, there are no more connected or disconnected commands
2936 * and no busy units; to avoid problems with re-inserting the commands
2937 * into the issue_queue (via scsi_done()), the aborted commands are
2938 * remembered in local variables first.
2940 local_irq_save(flags);
2941 connected = (Scsi_Cmnd *)hostdata->connected;
2942 hostdata->connected = NULL;
2943 disconnected_queue = (Scsi_Cmnd *)hostdata->disconnected_queue;
2944 hostdata->disconnected_queue = NULL;
2948 for (i = 0; i < 8; ++i)
2949 hostdata->busy[i] = 0;
2951 hostdata->dma_len = 0;
2953 local_irq_restore(flags);
2955 /* In order to tell the mid-level code which commands were aborted,
2956 * set the command status to DID_RESET and call scsi_done() !!!
2957 * This ultimately aborts processing of these commands in the mid-level.
2960 if ((cmd = connected)) {
2961 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2962 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2963 cmd->scsi_done(cmd);
2966 for (i = 0; (cmd = disconnected_queue); ++i) {
2967 disconnected_queue = NEXT(cmd);
2969 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2970 cmd->scsi_done(cmd);
2973 ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
2975 /* The Falcon lock should be released after a reset...
2977 /* ++guenther: moved to atari_scsi_reset(), to prevent a race between
2978 * unlocking and enabling dma interrupt.
2980 /* falcon_release_lock_if_possible( hostdata );*/
2982 /* since all commands have been explicitly terminated, we need to tell
2983 * the midlevel code that the reset was SUCCESSFUL, and there is no
2984 * need to 'wake up' the commands by a request_sense
2986 return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
2989 /* MSch: new-style reset handling: let the mid-level do what it can */
2991 /* ++guenther: MID-LEVEL IS STILL BROKEN.
2992 * Mid-level is supposed to requeue all commands that were active on the
2993 * various low-level queues. In fact it does this, but that's not enough
2994 * because all these commands are subject to timeout. And if a timeout
2995 * happens for any removed command, *_abort() is called but all queues
2996 * are now empty. Abort then gives up the falcon lock, which is fatal,
2997 * since the mid-level will queue more commands and must have the lock
2998 * (it's all happening inside timer interrupt handler!!).
2999 * Even worse, abort will return NOT_RUNNING for all those commands not
3000 * on any queue, so they won't be retried ...
3002 * Conclusion: either scsi.c disables timeout for all resetted commands
3003 * immediately, or we lose! As of linux-2.0.20 it doesn't.
3006 /* After the reset, there are no more connected or disconnected commands
3007 * and no busy units; so clear the low-level status here to avoid
3008 * conflicts when the mid-level code tries to wake up the affected
3012 if (hostdata->issue_queue)
3013 ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
3014 if (hostdata->connected)
3015 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
3016 if (hostdata->disconnected_queue)
3017 ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
3019 local_irq_save(flags);
3020 hostdata->issue_queue = NULL;
3021 hostdata->connected = NULL;
3022 hostdata->disconnected_queue = NULL;
3026 for (i = 0; i < 8; ++i)
3027 hostdata->busy[i] = 0;
3029 hostdata->dma_len = 0;
3031 local_irq_restore(flags);
3033 /* we did no complete reset of all commands, so a wakeup is required */
3034 return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;