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
32 * Revision 1.10 1998/9/2 Alan Cox
34 * Fixed up the timer lockups reported so far. Things still suck. Looking
35 * forward to 2.3 and per device request queues. Then it'll be possible to
36 * SMP thread this beast and improve life no end.
38 * Revision 1.9 1997/7/27 Ronald van Cuijlenborg
39 * (ronald.van.cuijlenborg@tip.nl or nutty@dds.nl)
40 * (hopefully) fixed and enhanced USLEEP
41 * added support for DTC3181E card (for Mustek scanner)
44 * Revision 1.8 Ingmar Baumgart
45 * (ingmar@gonzo.schwaben.de)
46 * added support for NCR53C400a card
49 * Revision 1.7 1996/3/2 Ray Van Tassle (rayvt@comm.mot.com)
51 * added support needed for DTC 3180/3280
52 * fixed a couple of bugs
55 * Revision 1.5 1994/01/19 09:14:57 drew
56 * Fixed udelay() hack that was being used on DATAOUT phases
57 * instead of a proper wait for the final handshake.
59 * Revision 1.4 1994/01/19 06:44:25 drew
60 * *** empty log message ***
62 * Revision 1.3 1994/01/19 05:24:40 drew
63 * Added support for TCR LAST_BYTE_SENT bit.
65 * Revision 1.2 1994/01/15 06:14:11 drew
66 * REAL DMA support, bug fixes.
68 * Revision 1.1 1994/01/15 06:00:54 drew
74 * Further development / testing that should be done :
75 * 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete
76 * code so that everything does the same thing that's done at the
77 * end of a pseudo-DMA read operation.
79 * 2. Fix REAL_DMA (interrupt driven, polled works fine) -
80 * basically, transfer size needs to be reduced by one
81 * and the last byte read as is done with PSEUDO_DMA.
83 * 4. Test SCSI-II tagged queueing (I have no devices which support
86 * 5. Test linked command handling code after Eric is ready with
87 * the high level code.
89 #include <scsi/scsi_dbg.h>
90 #include <scsi/scsi_transport_spi.h>
96 #define NDEBUG_ABORT 0
99 #if (NDEBUG & NDEBUG_LISTS)
100 #define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); }
101 #define REMOVE(w,x,y,z) {printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, (void*)(w), (void*)(x), (void*)(y), (void*)(z)); if ((x)==(y)) udelay(5); }
104 #define REMOVE(w,x,y,z)
114 #define READ_OVERRUNS
117 #ifdef BOARD_REQUIRES_NO_DELAY
118 #define io_recovery_delay(x)
120 #define io_recovery_delay(x) udelay(x)
126 * This is a generic 5380 driver. To use it on a different platform,
127 * one simply writes appropriate system specific macros (ie, data
128 * transfer - some PC's will use the I/O bus, 68K's must use
129 * memory mapped) and drops this file in their 'C' wrapper.
131 * (Note from hch: unfortunately it was not enough for the different
132 * m68k folks and instead of improving this driver they copied it
133 * and hacked it up for their needs. As a consequence they lost
134 * most updates to this driver. Maybe someone will fix all these
135 * drivers to use a common core one day..)
137 * As far as command queueing, two queues are maintained for
138 * each 5380 in the system - commands that haven't been issued yet,
139 * and commands that are currently executing. This means that an
140 * unlimited number of commands may be queued, letting
141 * more commands propagate from the higher driver levels giving higher
142 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
143 * allowing multiple commands to propagate all the way to a SCSI-II device
144 * while a command is already executing.
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 from a workqueue for each NCR5380 host in the
171 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by
172 * removing the commands from the issue queue and calling
173 * NCR5380_select() if a nexus is not established.
175 * Once a nexus is established, the NCR5380_information_transfer()
176 * phase goes through the various phases as instructed by the target.
177 * if the target goes into MSG IN and sends a DISCONNECT message,
178 * the command structure is placed into the per instance disconnected
179 * queue, and NCR5380_main tries to find more work. If the target is
180 * idle for too long, the system will try to sleep.
182 * If a command has disconnected, eventually an interrupt will trigger,
183 * calling NCR5380_intr() which will in turn call NCR5380_reselect
184 * to reestablish a nexus. This will run main if necessary.
186 * On command termination, the done function will be called as
189 * SCSI pointers are maintained in the SCp field of SCSI command
190 * structures, being initialized after the command is connected
191 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
192 * Note that in violation of the standard, an implicit SAVE POINTERS operation
193 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
198 * This file a skeleton Linux SCSI driver for the NCR 5380 series
199 * of chips. To use it, you write an architecture specific functions
200 * and macros and include this file in your driver.
202 * These macros control options :
203 * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be
206 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
207 * for commands that return with a CHECK CONDITION status.
209 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
212 * DONT_USE_INTR - if defined, never use interrupts, even if we probe or
213 * override-configure an IRQ.
215 * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512
216 * bytes at a time. Since interrupts are disabled by default during
217 * these transfers, we might need this to give reasonable interrupt
218 * service time if the transfer size gets too large.
220 * LINKED - if defined, linked commands are supported.
222 * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases.
224 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
226 * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't
227 * rely on phase mismatch and EOP interrupts to determine end
230 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You
231 * only really want to use this if you're having a problem with
232 * dropped characters during high speed communications, and even
233 * then, you're going to be better off twiddling with transfersize
234 * in the high level code.
236 * Defaults for these will be provided although the user may want to adjust
237 * these to allocate CPU resources to the SCSI driver or "real" code.
239 * USLEEP_SLEEP - amount of time, in jiffies, to sleep
241 * USLEEP_POLL - amount of time, in jiffies, to poll
243 * These macros MUST be defined :
244 * NCR5380_local_declare() - declare any local variables needed for your
247 * NCR5380_setup(instance) - initialize any local variables needed from a given
248 * instance of the host adapter for NCR5380_{read,write,pread,pwrite}
250 * NCR5380_read(register) - read from the specified register
252 * NCR5380_write(register, value) - write to the specific register
254 * NCR5380_implementation_fields - additional fields needed for this
255 * specific implementation of the NCR5380
257 * Either real DMA *or* pseudo DMA may be implemented
259 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
260 * Note that the DMA setup functions should return the number of bytes
261 * that they were able to program the controller for.
263 * Also note that generic i386/PC versions of these macros are
264 * available as NCR5380_i386_dma_write_setup,
265 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
267 * NCR5380_dma_write_setup(instance, src, count) - initialize
268 * NCR5380_dma_read_setup(instance, dst, count) - initialize
269 * NCR5380_dma_residual(instance); - residual count
272 * NCR5380_pwrite(instance, src, count)
273 * NCR5380_pread(instance, dst, count);
275 * The generic driver is initialized by calling NCR5380_init(instance),
276 * after setting the appropriate host specific fields and ID. If the
277 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
278 * possible) function may be used.
281 static int do_abort(struct Scsi_Host
*host
);
282 static void do_reset(struct Scsi_Host
*host
);
285 * initialize_SCp - init the scsi pointer field
286 * @cmd: command block to set up
288 * Set up the internal fields in the SCSI command.
291 static __inline__
void initialize_SCp(Scsi_Cmnd
* cmd
)
294 * Initialize the Scsi Pointer field so that all of the commands in the
295 * various queues are valid.
298 if (scsi_bufflen(cmd
)) {
299 cmd
->SCp
.buffer
= scsi_sglist(cmd
);
300 cmd
->SCp
.buffers_residual
= scsi_sg_count(cmd
) - 1;
301 cmd
->SCp
.ptr
= sg_virt(cmd
->SCp
.buffer
);
302 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
304 cmd
->SCp
.buffer
= NULL
;
305 cmd
->SCp
.buffers_residual
= 0;
307 cmd
->SCp
.this_residual
= 0;
312 * NCR5380_poll_politely - wait for NCR5380 status bits
313 * @instance: controller to poll
314 * @reg: 5380 register to poll
315 * @bit: Bitmask to check
316 * @val: Value required to exit
318 * Polls the NCR5380 in a reasonably efficient manner waiting for
319 * an event to occur, after a short quick poll we begin giving the
320 * CPU back in non IRQ contexts
322 * Returns the value of the register or a negative error code.
325 static int NCR5380_poll_politely(struct Scsi_Host
*instance
, int reg
, int bit
, int val
, int t
)
327 NCR5380_local_declare();
328 int n
= 500; /* At about 8uS a cycle for the cpu access */
329 unsigned long end
= jiffies
+ t
;
332 NCR5380_setup(instance
);
336 r
= NCR5380_read(reg
);
343 while(time_before(jiffies
, end
))
345 r
= NCR5380_read(reg
);
359 } phases
[] __maybe_unused
= {
360 {PHASE_DATAOUT
, "DATAOUT"},
361 {PHASE_DATAIN
, "DATAIN"},
362 {PHASE_CMDOUT
, "CMDOUT"},
363 {PHASE_STATIN
, "STATIN"},
364 {PHASE_MSGOUT
, "MSGOUT"},
365 {PHASE_MSGIN
, "MSGIN"},
366 {PHASE_UNKNOWN
, "UNKNOWN"}
390 {ICR_ASSERT_RST
, "ASSERT RST"},
391 {ICR_ASSERT_ACK
, "ASSERT ACK"},
392 {ICR_ASSERT_BSY
, "ASSERT BSY"},
393 {ICR_ASSERT_SEL
, "ASSERT SEL"},
394 {ICR_ASSERT_ATN
, "ASSERT ATN"},
395 {ICR_ASSERT_DATA
, "ASSERT DATA"},
399 {MR_BLOCK_DMA_MODE
, "MODE BLOCK DMA"},
400 {MR_TARGET
, "MODE TARGET"},
401 {MR_ENABLE_PAR_CHECK
, "MODE PARITY CHECK"},
402 {MR_ENABLE_PAR_INTR
, "MODE PARITY INTR"},
403 {MR_MONITOR_BSY
, "MODE MONITOR BSY"},
404 {MR_DMA_MODE
, "MODE DMA"},
405 {MR_ARBITRATE
, "MODE ARBITRATION"},
410 * NCR5380_print - print scsi bus signals
411 * @instance: adapter state to dump
413 * Print the SCSI bus signals for debugging purposes
415 * Locks: caller holds hostdata lock (not essential)
418 static void NCR5380_print(struct Scsi_Host
*instance
)
420 NCR5380_local_declare();
421 unsigned char status
, data
, basr
, mr
, icr
, i
;
422 NCR5380_setup(instance
);
424 data
= NCR5380_read(CURRENT_SCSI_DATA_REG
);
425 status
= NCR5380_read(STATUS_REG
);
426 mr
= NCR5380_read(MODE_REG
);
427 icr
= NCR5380_read(INITIATOR_COMMAND_REG
);
428 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
430 printk("STATUS_REG: %02x ", status
);
431 for (i
= 0; signals
[i
].mask
; ++i
)
432 if (status
& signals
[i
].mask
)
433 printk(",%s", signals
[i
].name
);
434 printk("\nBASR: %02x ", basr
);
435 for (i
= 0; basrs
[i
].mask
; ++i
)
436 if (basr
& basrs
[i
].mask
)
437 printk(",%s", basrs
[i
].name
);
438 printk("\nICR: %02x ", icr
);
439 for (i
= 0; icrs
[i
].mask
; ++i
)
440 if (icr
& icrs
[i
].mask
)
441 printk(",%s", icrs
[i
].name
);
442 printk("\nMODE: %02x ", mr
);
443 for (i
= 0; mrs
[i
].mask
; ++i
)
444 if (mr
& mrs
[i
].mask
)
445 printk(",%s", mrs
[i
].name
);
451 * NCR5380_print_phase - show SCSI phase
452 * @instance: adapter to dump
454 * Print the current SCSI phase for debugging purposes
459 static void NCR5380_print_phase(struct Scsi_Host
*instance
)
461 NCR5380_local_declare();
462 unsigned char status
;
464 NCR5380_setup(instance
);
466 status
= NCR5380_read(STATUS_REG
);
467 if (!(status
& SR_REQ
))
468 printk("scsi%d : REQ not asserted, phase unknown.\n", instance
->host_no
);
470 for (i
= 0; (phases
[i
].value
!= PHASE_UNKNOWN
) && (phases
[i
].value
!= (status
& PHASE_MASK
)); ++i
);
471 printk("scsi%d : phase %s\n", instance
->host_no
, phases
[i
].name
);
477 * These need tweaking, and would probably work best as per-device
478 * flags initialized differently for disk, tape, cd, etc devices.
479 * People with broken devices are free to experiment as to what gives
480 * the best results for them.
482 * USLEEP_SLEEP should be a minimum seek time.
484 * USLEEP_POLL should be a maximum rotational latency.
487 /* 20 ms (reasonable hard disk speed) */
488 #define USLEEP_SLEEP (20*HZ/1000)
490 /* 300 RPM (floppy speed) */
492 #define USLEEP_POLL (200*HZ/1000)
494 #ifndef USLEEP_WAITLONG
495 /* RvC: (reasonable time to wait on select error) */
496 #define USLEEP_WAITLONG USLEEP_SLEEP
500 * Function : int should_disconnect (unsigned char cmd)
502 * Purpose : decide whether a command would normally disconnect or
503 * not, since if it won't disconnect we should go to sleep.
505 * Input : cmd - opcode of SCSI command
507 * Returns : DISCONNECT_LONG if we should disconnect for a really long
508 * time (ie always, sleep, look for REQ active, sleep),
509 * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal
510 * time-to-data delay, DISCONNECT_NONE if this command would return
513 * Future sleep algorithms based on time to data can exploit
514 * something like this so they can differentiate between "normal"
515 * (ie, read, write, seek) and unusual commands (ie, * format).
517 * Note : We don't deal with commands that handle an immediate disconnect,
521 static int should_disconnect(unsigned char cmd
)
530 return DISCONNECT_TIME_TO_DATA
;
535 return DISCONNECT_LONG
;
537 return DISCONNECT_NONE
;
541 static void NCR5380_set_timer(struct NCR5380_hostdata
*hostdata
, unsigned long timeout
)
543 hostdata
->time_expires
= jiffies
+ timeout
;
544 schedule_delayed_work(&hostdata
->coroutine
, timeout
);
548 static int probe_irq __initdata
= 0;
551 * probe_intr - helper for IRQ autoprobe
552 * @irq: interrupt number
556 * Set a flag to indicate the IRQ in question was received. This is
557 * used by the IRQ probe code.
560 static irqreturn_t __init
probe_intr(int irq
, void *dev_id
)
567 * NCR5380_probe_irq - find the IRQ of an NCR5380
568 * @instance: NCR5380 controller
569 * @possible: bitmask of ISA IRQ lines
571 * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ
572 * and then looking to see what interrupt actually turned up.
574 * Locks: none, irqs must be enabled on entry
577 static int __init __maybe_unused
NCR5380_probe_irq(struct Scsi_Host
*instance
,
580 NCR5380_local_declare();
581 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*) instance
->hostdata
;
582 unsigned long timeout
;
583 int trying_irqs
, i
, mask
;
584 NCR5380_setup(instance
);
586 for (trying_irqs
= i
= 0, mask
= 1; i
< 16; ++i
, mask
<<= 1)
587 if ((mask
& possible
) && (request_irq(i
, &probe_intr
, IRQF_DISABLED
, "NCR-probe", NULL
) == 0))
590 timeout
= jiffies
+ (250 * HZ
/ 1000);
591 probe_irq
= SCSI_IRQ_NONE
;
594 * A interrupt is triggered whenever BSY = false, SEL = true
595 * and a bit set in the SELECT_ENABLE_REG is asserted on the
598 * Note that the bus is only driven when the phase control signals
599 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that
603 NCR5380_write(TARGET_COMMAND_REG
, 0);
604 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
605 NCR5380_write(OUTPUT_DATA_REG
, hostdata
->id_mask
);
606 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
| ICR_ASSERT_SEL
);
608 while (probe_irq
== SCSI_IRQ_NONE
&& time_before(jiffies
, timeout
))
609 schedule_timeout_uninterruptible(1);
611 NCR5380_write(SELECT_ENABLE_REG
, 0);
612 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
614 for (i
= 0, mask
= 1; i
< 16; ++i
, mask
<<= 1)
615 if (trying_irqs
& mask
)
622 * NCR58380_print_options - show options
623 * @instance: unused for now
625 * Called by probe code indicating the NCR5380 driver options that
626 * were selected. At some point this will switch to runtime options
627 * read from the adapter in question
632 static void __init __maybe_unused
633 NCR5380_print_options(struct Scsi_Host
*instance
)
635 printk(" generic options"
661 printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL
, USLEEP_SLEEP
);
662 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE
);
663 if (((struct NCR5380_hostdata
*) instance
->hostdata
)->flags
& FLAG_NCR53C400
) {
664 printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE
);
669 * NCR5380_print_status - dump controller info
670 * @instance: controller to dump
672 * Print commands in the various queues, called from NCR5380_abort
673 * and NCR5380_debug to aid debugging.
675 * Locks: called functions disable irqs
678 static void NCR5380_print_status(struct Scsi_Host
*instance
)
680 NCR5380_dprint(NDEBUG_ANY
, instance
);
681 NCR5380_dprint_phase(NDEBUG_ANY
, instance
);
684 /******************************************/
686 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
688 * *buffer: I/O buffer
689 * **start: if inout == FALSE pointer into buffer where user read should start
690 * offset: current offset
691 * length: length of buffer
692 * hostno: Scsi_Host host_no
693 * inout: TRUE - user is writing; FALSE - user is reading
695 * Return the number of bytes read from or written
699 #define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0)
701 char *lprint_Scsi_Cmnd(Scsi_Cmnd
* cmd
, char *pos
, char *buffer
, int length
);
703 char *lprint_command(unsigned char *cmd
, char *pos
, char *buffer
, int len
);
705 char *lprint_opcode(int opcode
, char *pos
, char *buffer
, int length
);
707 static int __maybe_unused
NCR5380_proc_info(struct Scsi_Host
*instance
,
708 char *buffer
, char **start
, off_t offset
, int length
, int inout
)
711 struct NCR5380_hostdata
*hostdata
;
714 hostdata
= (struct NCR5380_hostdata
*) instance
->hostdata
;
716 if (inout
) { /* Has data been written to the file ? */
717 #ifdef DTC_PUBLIC_RELEASE
718 dtc_wmaxi
= dtc_maxi
= 0;
720 #ifdef PAS16_PUBLIC_RELEASE
721 pas_wmaxi
= pas_maxi
= 0;
723 return (-ENOSYS
); /* Currently this is a no-op */
725 SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE
);
726 if (((struct NCR5380_hostdata
*) instance
->hostdata
)->flags
& FLAG_NCR53C400
)
727 SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE
);
728 #ifdef DTC_PUBLIC_RELEASE
729 SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE
);
731 #ifdef T128_PUBLIC_RELEASE
732 SPRINTF("T128 release %d", T128_PUBLIC_RELEASE
);
734 #ifdef GENERIC_NCR5380_PUBLIC_RELEASE
735 SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE
);
737 #ifdef PAS16_PUBLIC_RELEASE
738 SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE
);
741 SPRINTF("\nBase Addr: 0x%05lX ", (long) instance
->base
);
742 SPRINTF("io_port: %04x ", (int) instance
->io_port
);
743 if (instance
->irq
== SCSI_IRQ_NONE
)
744 SPRINTF("IRQ: None.\n");
746 SPRINTF("IRQ: %d.\n", instance
->irq
);
748 #ifdef DTC_PUBLIC_RELEASE
749 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi
, dtc_maxi
);
751 #ifdef PAS16_PUBLIC_RELEASE
752 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi
, pas_maxi
);
754 spin_lock_irq(instance
->host_lock
);
755 if (!hostdata
->connected
)
756 SPRINTF("scsi%d: no currently connected command\n", instance
->host_no
);
758 pos
= lprint_Scsi_Cmnd((Scsi_Cmnd
*) hostdata
->connected
, pos
, buffer
, length
);
759 SPRINTF("scsi%d: issue_queue\n", instance
->host_no
);
760 for (ptr
= (Scsi_Cmnd
*) hostdata
->issue_queue
; ptr
; ptr
= (Scsi_Cmnd
*) ptr
->host_scribble
)
761 pos
= lprint_Scsi_Cmnd(ptr
, pos
, buffer
, length
);
763 SPRINTF("scsi%d: disconnected_queue\n", instance
->host_no
);
764 for (ptr
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
; ptr
; ptr
= (Scsi_Cmnd
*) ptr
->host_scribble
)
765 pos
= lprint_Scsi_Cmnd(ptr
, pos
, buffer
, length
);
766 spin_unlock_irq(instance
->host_lock
);
769 if (pos
- buffer
< offset
)
771 else if (pos
- buffer
- offset
< length
)
772 return pos
- buffer
- offset
;
776 static char *lprint_Scsi_Cmnd(Scsi_Cmnd
* cmd
, char *pos
, char *buffer
, int length
)
778 SPRINTF("scsi%d : destination target %d, lun %d\n", cmd
->device
->host
->host_no
, cmd
->device
->id
, cmd
->device
->lun
);
779 SPRINTF(" command = ");
780 pos
= lprint_command(cmd
->cmnd
, pos
, buffer
, length
);
784 static char *lprint_command(unsigned char *command
, char *pos
, char *buffer
, int length
)
787 pos
= lprint_opcode(command
[0], pos
, buffer
, length
);
788 for (i
= 1, s
= COMMAND_SIZE(command
[0]); i
< s
; ++i
)
789 SPRINTF("%02x ", command
[i
]);
794 static char *lprint_opcode(int opcode
, char *pos
, char *buffer
, int length
)
796 SPRINTF("%2d (0x%02x)", opcode
, opcode
);
802 * NCR5380_init - initialise an NCR5380
803 * @instance: adapter to configure
804 * @flags: control flags
806 * Initializes *instance and corresponding 5380 chip,
807 * with flags OR'd into the initial flags value.
809 * Notes : I assume that the host, hostno, and id bits have been
810 * set correctly. I don't care about the irq and other fields.
812 * Returns 0 for success
814 * Locks: interrupts must be enabled when we are called
817 static int __devinit
NCR5380_init(struct Scsi_Host
*instance
, int flags
)
819 NCR5380_local_declare();
821 unsigned long timeout
;
822 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*) instance
->hostdata
;
825 printk(KERN_ERR
"NCR5380_init called with interrupts off!\n");
827 * On NCR53C400 boards, NCR5380 registers are mapped 8 past
832 if (flags
& FLAG_NCR53C400
)
833 instance
->NCR5380_instance_name
+= NCR53C400_address_adjust
;
836 NCR5380_setup(instance
);
838 hostdata
->aborted
= 0;
839 hostdata
->id_mask
= 1 << instance
->this_id
;
840 for (i
= hostdata
->id_mask
; i
<= 0x80; i
<<= 1)
841 if (i
> hostdata
->id_mask
)
842 hostdata
->id_higher_mask
|= i
;
843 for (i
= 0; i
< 8; ++i
)
844 hostdata
->busy
[i
] = 0;
846 hostdata
->dmalen
= 0;
848 hostdata
->targets_present
= 0;
849 hostdata
->connected
= NULL
;
850 hostdata
->issue_queue
= NULL
;
851 hostdata
->disconnected_queue
= NULL
;
853 INIT_DELAYED_WORK(&hostdata
->coroutine
, NCR5380_main
);
856 for (i
= 0; i
< 8; ++i
) {
857 hostdata
->time_read
[i
] = 0;
858 hostdata
->time_write
[i
] = 0;
859 hostdata
->bytes_read
[i
] = 0;
860 hostdata
->bytes_write
[i
] = 0;
862 hostdata
->timebase
= 0;
863 hostdata
->pendingw
= 0;
864 hostdata
->pendingr
= 0;
867 /* The CHECK code seems to break the 53C400. Will check it later maybe */
868 if (flags
& FLAG_NCR53C400
)
869 hostdata
->flags
= FLAG_HAS_LAST_BYTE_SENT
| flags
;
871 hostdata
->flags
= FLAG_CHECK_LAST_BYTE_SENT
| flags
;
873 hostdata
->host
= instance
;
874 hostdata
->time_expires
= 0;
877 if ((instance
->cmd_per_lun
> 1) || instance
->can_queue
> 1)
878 printk(KERN_WARNING
"scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n"
879 " be incorrectly cleared.\n", instance
->host_no
);
880 #endif /* def AUTOSENSE */
882 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
883 NCR5380_write(MODE_REG
, MR_BASE
);
884 NCR5380_write(TARGET_COMMAND_REG
, 0);
885 NCR5380_write(SELECT_ENABLE_REG
, 0);
888 if (hostdata
->flags
& FLAG_NCR53C400
) {
889 NCR5380_write(C400_CONTROL_STATUS_REG
, CSR_BASE
);
894 * Detect and correct bus wedge problems.
896 * If the system crashed, it may have crashed in a state
897 * where a SCSI command was still executing, and the
898 * SCSI bus is not in a BUS FREE STATE.
900 * If this is the case, we'll try to abort the currently
901 * established nexus which we know nothing about, and that
902 * failing, do a hard reset of the SCSI bus
905 for (pass
= 1; (NCR5380_read(STATUS_REG
) & SR_BSY
) && pass
<= 6; ++pass
) {
910 printk(KERN_INFO
"scsi%d: SCSI bus busy, waiting up to five seconds\n", instance
->host_no
);
911 timeout
= jiffies
+ 5 * HZ
;
912 NCR5380_poll_politely(instance
, STATUS_REG
, SR_BSY
, 0, 5*HZ
);
915 printk(KERN_WARNING
"scsi%d: bus busy, attempting abort\n", instance
->host_no
);
919 printk(KERN_WARNING
"scsi%d: bus busy, attempting reset\n", instance
->host_no
);
923 printk(KERN_ERR
"scsi%d: bus locked solid or invalid override\n", instance
->host_no
);
931 * NCR5380_exit - remove an NCR5380
932 * @instance: adapter to remove
935 static void __devexit
NCR5380_exit(struct Scsi_Host
*instance
)
937 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*) instance
->hostdata
;
939 cancel_delayed_work(&hostdata
->coroutine
);
940 flush_scheduled_work();
944 * NCR5380_queue_command - queue a command
946 * @done: completion handler
948 * cmd is added to the per instance issue_queue, with minor
949 * twiddling done to the host specific fields of cmd. If the
950 * main coroutine is not running, it is restarted.
952 * Locks: host lock taken by caller
955 static int NCR5380_queue_command(Scsi_Cmnd
* cmd
, void (*done
) (Scsi_Cmnd
*))
957 struct Scsi_Host
*instance
= cmd
->device
->host
;
958 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*) instance
->hostdata
;
961 #if (NDEBUG & NDEBUG_NO_WRITE)
962 switch (cmd
->cmnd
[0]) {
965 printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance
->host_no
);
966 cmd
->result
= (DID_ERROR
<< 16);
970 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
973 switch (cmd
->cmnd
[0]) {
977 hostdata
->time_write
[cmd
->device
->id
] -= (jiffies
- hostdata
->timebase
);
978 hostdata
->bytes_write
[cmd
->device
->id
] += scsi_bufflen(cmd
);
979 hostdata
->pendingw
++;
984 hostdata
->time_read
[cmd
->device
->id
] -= (jiffies
- hostdata
->timebase
);
985 hostdata
->bytes_read
[cmd
->device
->id
] += scsi_bufflen(cmd
);
986 hostdata
->pendingr
++;
992 * We use the host_scribble field as a pointer to the next command
996 cmd
->host_scribble
= NULL
;
997 cmd
->scsi_done
= done
;
1001 * Insert the cmd into the issue queue. Note that REQUEST SENSE
1002 * commands are added to the head of the queue since any command will
1003 * clear the contingent allegiance condition that exists and the
1004 * sense data is only guaranteed to be valid while the condition exists.
1007 if (!(hostdata
->issue_queue
) || (cmd
->cmnd
[0] == REQUEST_SENSE
)) {
1008 LIST(cmd
, hostdata
->issue_queue
);
1009 cmd
->host_scribble
= (unsigned char *) hostdata
->issue_queue
;
1010 hostdata
->issue_queue
= cmd
;
1012 for (tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
; tmp
->host_scribble
; tmp
= (Scsi_Cmnd
*) tmp
->host_scribble
);
1014 tmp
->host_scribble
= (unsigned char *) cmd
;
1016 dprintk(NDEBUG_QUEUES
, ("scsi%d : command added to %s of queue\n", instance
->host_no
, (cmd
->cmnd
[0] == REQUEST_SENSE
) ? "head" : "tail"));
1018 /* Run the coroutine if it isn't already running. */
1019 /* Kick off command processing */
1020 schedule_delayed_work(&hostdata
->coroutine
, 0);
1026 * NCR5380_main - NCR state machines
1028 * NCR5380_main is a coroutine that runs as long as more work can
1029 * be done on the NCR5380 host adapters in a system. Both
1030 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1031 * in case it is not running.
1033 * Locks: called as its own thread with no locks held. Takes the
1034 * host lock and called routines may take the isa dma lock.
1037 static void NCR5380_main(struct work_struct
*work
)
1039 struct NCR5380_hostdata
*hostdata
=
1040 container_of(work
, struct NCR5380_hostdata
, coroutine
.work
);
1041 struct Scsi_Host
*instance
= hostdata
->host
;
1042 Scsi_Cmnd
*tmp
, *prev
;
1045 spin_lock_irq(instance
->host_lock
);
1047 /* Lock held here */
1049 if (!hostdata
->connected
&& !hostdata
->selecting
) {
1050 dprintk(NDEBUG_MAIN
, ("scsi%d : not connected\n", instance
->host_no
));
1052 * Search through the issue_queue for a command destined
1053 * for a target that's not busy.
1055 for (tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
, prev
= NULL
; tmp
; prev
= tmp
, tmp
= (Scsi_Cmnd
*) tmp
->host_scribble
)
1058 dprintk(NDEBUG_LISTS
, ("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp
, tmp
->target
, hostdata
->busy
[tmp
->target
], tmp
->lun
));
1059 /* When we find one, remove it from the issue queue. */
1060 if (!(hostdata
->busy
[tmp
->device
->id
] & (1 << tmp
->device
->lun
))) {
1062 REMOVE(prev
, prev
->host_scribble
, tmp
, tmp
->host_scribble
);
1063 prev
->host_scribble
= tmp
->host_scribble
;
1065 REMOVE(-1, hostdata
->issue_queue
, tmp
, tmp
->host_scribble
);
1066 hostdata
->issue_queue
= (Scsi_Cmnd
*) tmp
->host_scribble
;
1068 tmp
->host_scribble
= NULL
;
1071 * Attempt to establish an I_T_L nexus here.
1072 * On success, instance->hostdata->connected is set.
1073 * On failure, we must add the command back to the
1074 * issue queue so we can keep trying.
1076 dprintk(NDEBUG_MAIN
|NDEBUG_QUEUES
, ("scsi%d : main() : command for target %d lun %d removed from issue_queue\n", instance
->host_no
, tmp
->target
, tmp
->lun
));
1079 * A successful selection is defined as one that
1080 * leaves us with the command connected and
1081 * in hostdata->connected, OR has terminated the
1084 * With successful commands, we fall through
1085 * and see if we can do an information transfer,
1086 * with failures we will restart.
1088 hostdata
->selecting
= NULL
;
1089 /* RvC: have to preset this to indicate a new command is being performed */
1091 if (!NCR5380_select(instance
, tmp
,
1093 * REQUEST SENSE commands are issued without tagged
1094 * queueing, even on SCSI-II devices because the
1095 * contingent allegiance condition exists for the
1098 (tmp
->cmnd
[0] == REQUEST_SENSE
) ? TAG_NONE
: TAG_NEXT
)) {
1101 LIST(tmp
, hostdata
->issue_queue
);
1102 tmp
->host_scribble
= (unsigned char *) hostdata
->issue_queue
;
1103 hostdata
->issue_queue
= tmp
;
1105 dprintk(NDEBUG_MAIN
|NDEBUG_QUEUES
, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance
->host_no
));
1107 /* lock held here still */
1108 } /* if target/lun is not busy */
1111 } /* if (!hostdata->connected) */
1112 if (hostdata
->selecting
) {
1113 tmp
= (Scsi_Cmnd
*) hostdata
->selecting
;
1114 /* Selection will drop and retake the lock */
1115 if (!NCR5380_select(instance
, tmp
, (tmp
->cmnd
[0] == REQUEST_SENSE
) ? TAG_NONE
: TAG_NEXT
)) {
1118 /* RvC: device failed, so we wait a long time
1119 this is needed for Mustek scanners, that
1120 do not respond to commands immediately
1122 printk(KERN_DEBUG
"scsi%d: device %d did not respond in time\n", instance
->host_no
, tmp
->device
->id
);
1123 LIST(tmp
, hostdata
->issue_queue
);
1124 tmp
->host_scribble
= (unsigned char *) hostdata
->issue_queue
;
1125 hostdata
->issue_queue
= tmp
;
1126 NCR5380_set_timer(hostdata
, USLEEP_WAITLONG
);
1128 } /* if hostdata->selecting */
1129 if (hostdata
->connected
1131 && !hostdata
->dmalen
1133 && (!hostdata
->time_expires
|| time_before_eq(hostdata
->time_expires
, jiffies
))
1135 dprintk(NDEBUG_MAIN
, ("scsi%d : main() : performing information transfer\n", instance
->host_no
));
1136 NCR5380_information_transfer(instance
);
1137 dprintk(NDEBUG_MAIN
, ("scsi%d : main() : done set false\n", instance
->host_no
));
1143 spin_unlock_irq(instance
->host_lock
);
1146 #ifndef DONT_USE_INTR
1149 * NCR5380_intr - generic NCR5380 irq handler
1150 * @irq: interrupt number
1151 * @dev_id: device info
1153 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1154 * from the disconnected queue, and restarting NCR5380_main()
1157 * Locks: takes the needed instance locks
1160 static irqreturn_t
NCR5380_intr(int dummy
, void *dev_id
)
1162 NCR5380_local_declare();
1163 struct Scsi_Host
*instance
= dev_id
;
1164 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*) instance
->hostdata
;
1167 unsigned long flags
;
1169 dprintk(NDEBUG_INTR
, ("scsi : NCR5380 irq %d triggered\n",
1174 spin_lock_irqsave(instance
->host_lock
, flags
);
1175 /* Look for pending interrupts */
1176 NCR5380_setup(instance
);
1177 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
1178 /* XXX dispatch to appropriate routine if found and done=0 */
1179 if (basr
& BASR_IRQ
) {
1180 NCR5380_dprint(NDEBUG_INTR
, instance
);
1181 if ((NCR5380_read(STATUS_REG
) & (SR_SEL
| SR_IO
)) == (SR_SEL
| SR_IO
)) {
1183 dprintk(NDEBUG_INTR
, ("scsi%d : SEL interrupt\n", instance
->host_no
));
1184 NCR5380_reselect(instance
);
1185 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1186 } else if (basr
& BASR_PARITY_ERROR
) {
1187 dprintk(NDEBUG_INTR
, ("scsi%d : PARITY interrupt\n", instance
->host_no
));
1188 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1189 } else if ((NCR5380_read(STATUS_REG
) & SR_RST
) == SR_RST
) {
1190 dprintk(NDEBUG_INTR
, ("scsi%d : RESET interrupt\n", instance
->host_no
));
1191 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1193 #if defined(REAL_DMA)
1195 * We should only get PHASE MISMATCH and EOP interrupts
1196 * if we have DMA enabled, so do a sanity check based on
1197 * the current setting of the MODE register.
1200 if ((NCR5380_read(MODE_REG
) & MR_DMA
) && ((basr
& BASR_END_DMA_TRANSFER
) || !(basr
& BASR_PHASE_MATCH
))) {
1203 if (!hostdata
->connected
)
1204 panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance
->hostno
);
1206 transfered
= (hostdata
->dmalen
- NCR5380_dma_residual(instance
));
1207 hostdata
->connected
->SCp
.this_residual
-= transferred
;
1208 hostdata
->connected
->SCp
.ptr
+= transferred
;
1209 hostdata
->dmalen
= 0;
1211 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1213 /* FIXME: we need to poll briefly then defer a workqueue task ! */
1214 NCR5380_poll_politely(hostdata
, BUS_AND_STATUS_REG
, BASR_ACK
, 0, 2*HZ
);
1216 NCR5380_write(MODE_REG
, MR_BASE
);
1217 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1220 dprintk(NDEBUG_INTR
, ("scsi : unknown interrupt, BASR 0x%X, MR 0x%X, SR 0x%x\n", basr
, NCR5380_read(MODE_REG
), NCR5380_read(STATUS_REG
)));
1221 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1225 spin_unlock_irqrestore(instance
->host_lock
, flags
);
1227 schedule_delayed_work(&hostdata
->coroutine
, 0);
1235 * collect_stats - collect stats on a scsi command
1236 * @hostdata: adapter
1237 * @cmd: command being issued
1239 * Update the statistical data by parsing the command in question
1242 static void collect_stats(struct NCR5380_hostdata
*hostdata
, Scsi_Cmnd
* cmd
)
1244 #ifdef NCR5380_STATS
1245 switch (cmd
->cmnd
[0]) {
1249 hostdata
->time_write
[scmd_id(cmd
)] += (jiffies
- hostdata
->timebase
);
1250 hostdata
->pendingw
--;
1255 hostdata
->time_read
[scmd_id(cmd
)] += (jiffies
- hostdata
->timebase
);
1256 hostdata
->pendingr
--;
1264 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
1267 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1268 * including ARBITRATION, SELECTION, and initial message out for
1269 * IDENTIFY and queue messages.
1271 * Inputs : instance - instantiation of the 5380 driver on which this
1272 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1273 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1274 * the command that is presently connected.
1276 * Returns : -1 if selection could not execute for some reason,
1277 * 0 if selection succeeded or failed because the target
1281 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1282 * with registers as they should have been on entry - ie
1283 * SELECT_ENABLE will be set appropriately, the NCR5380
1284 * will cease to drive any SCSI bus signals.
1286 * If successful : I_T_L or I_T_L_Q nexus will be established,
1287 * instance->connected will be set to cmd.
1288 * SELECT interrupt will be disabled.
1290 * If failed (no target) : cmd->scsi_done() will be called, and the
1291 * cmd->result host byte set to DID_BAD_TARGET.
1293 * Locks: caller holds hostdata lock in IRQ mode
1296 static int NCR5380_select(struct Scsi_Host
*instance
, Scsi_Cmnd
* cmd
, int tag
)
1298 NCR5380_local_declare();
1299 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*) instance
->hostdata
;
1300 unsigned char tmp
[3], phase
;
1301 unsigned char *data
;
1303 unsigned long timeout
;
1304 unsigned char value
;
1306 NCR5380_setup(instance
);
1308 if (hostdata
->selecting
)
1311 hostdata
->restart_select
= 0;
1313 NCR5380_dprint(NDEBUG_ARBITRATION
, instance
);
1314 dprintk(NDEBUG_ARBITRATION
, ("scsi%d : starting arbitration, id = %d\n", instance
->host_no
, instance
->this_id
));
1317 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1318 * data bus during SELECTION.
1321 NCR5380_write(TARGET_COMMAND_REG
, 0);
1324 * Start arbitration.
1327 NCR5380_write(OUTPUT_DATA_REG
, hostdata
->id_mask
);
1328 NCR5380_write(MODE_REG
, MR_ARBITRATE
);
1331 /* We can be relaxed here, interrupts are on, we are
1332 in workqueue context, the birds are singing in the trees */
1333 spin_unlock_irq(instance
->host_lock
);
1334 err
= NCR5380_poll_politely(instance
, INITIATOR_COMMAND_REG
, ICR_ARBITRATION_PROGRESS
, ICR_ARBITRATION_PROGRESS
, 5*HZ
);
1335 spin_lock_irq(instance
->host_lock
);
1337 printk(KERN_DEBUG
"scsi: arbitration timeout at %d\n", __LINE__
);
1338 NCR5380_write(MODE_REG
, MR_BASE
);
1339 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1343 dprintk(NDEBUG_ARBITRATION
, ("scsi%d : arbitration complete\n", instance
->host_no
));
1346 * The arbitration delay is 2.2us, but this is a minimum and there is
1347 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1348 * the integral nature of udelay().
1354 /* Check for lost arbitration */
1355 if ((NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) || (NCR5380_read(CURRENT_SCSI_DATA_REG
) & hostdata
->id_higher_mask
) || (NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
)) {
1356 NCR5380_write(MODE_REG
, MR_BASE
);
1357 dprintk(NDEBUG_ARBITRATION
, ("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance
->host_no
));
1360 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_SEL
);
1362 if (!(hostdata
->flags
& FLAG_DTC3181E
) &&
1363 /* RvC: DTC3181E has some trouble with this
1364 * so we simply removed it. Seems to work with
1365 * only Mustek scanner attached
1367 (NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
)) {
1368 NCR5380_write(MODE_REG
, MR_BASE
);
1369 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1370 dprintk(NDEBUG_ARBITRATION
, ("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance
->host_no
));
1374 * Again, bus clear + bus settle time is 1.2us, however, this is
1375 * a minimum so we'll udelay ceil(1.2)
1380 dprintk(NDEBUG_ARBITRATION
, ("scsi%d : won arbitration\n", instance
->host_no
));
1383 * Now that we have won arbitration, start Selection process, asserting
1384 * the host and target ID's on the SCSI bus.
1387 NCR5380_write(OUTPUT_DATA_REG
, (hostdata
->id_mask
| (1 << scmd_id(cmd
))));
1390 * Raise ATN while SEL is true before BSY goes false from arbitration,
1391 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1392 * phase immediately after selection.
1395 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_BSY
| ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1396 NCR5380_write(MODE_REG
, MR_BASE
);
1399 * Reselect interrupts must be turned off prior to the dropping of BSY,
1400 * otherwise we will trigger an interrupt.
1402 NCR5380_write(SELECT_ENABLE_REG
, 0);
1405 * The initiator shall then wait at least two deskew delays and release
1408 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1411 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1414 * Something weird happens when we cease to drive BSY - looks
1415 * like the board/chip is letting us do another read before the
1416 * appropriate propagation delay has expired, and we're confusing
1417 * a BSY signal from ourselves as the target's response to SELECTION.
1419 * A small delay (the 'C++' frontend breaks the pipeline with an
1420 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1421 * tighter 'C' code breaks and requires this) solves the problem -
1422 * the 1 us delay is arbitrary, and only used because this delay will
1423 * be the same on other platforms and since it works here, it should
1426 * wingel suggests that this could be due to failing to wait
1432 dprintk(NDEBUG_SELECTION
, ("scsi%d : selecting target %d\n", instance
->host_no
, scmd_id(cmd
)));
1435 * The SCSI specification calls for a 250 ms timeout for the actual
1439 timeout
= jiffies
+ (250 * HZ
/ 1000);
1442 * XXX very interesting - we're seeing a bounce where the BSY we
1443 * asserted is being reflected / still asserted (propagation delay?)
1444 * and it's detecting as true. Sigh.
1447 hostdata
->select_time
= 0; /* we count the clock ticks at which we polled */
1448 hostdata
->selecting
= cmd
;
1451 /* RvC: here we enter after a sleeping period, or immediately after
1453 we poll only once ech clock tick */
1454 value
= NCR5380_read(STATUS_REG
) & (SR_BSY
| SR_IO
);
1456 if (!value
&& (hostdata
->select_time
< HZ
/4)) {
1457 /* RvC: we still must wait for a device response */
1458 hostdata
->select_time
++; /* after 25 ticks the device has failed */
1459 NCR5380_set_timer(hostdata
, 1);
1460 return 0; /* RvC: we return here with hostdata->selecting set,
1464 hostdata
->selecting
= NULL
;/* clear this pointer, because we passed the
1466 if ((NCR5380_read(STATUS_REG
) & (SR_SEL
| SR_IO
)) == (SR_SEL
| SR_IO
)) {
1467 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1468 NCR5380_reselect(instance
);
1469 printk("scsi%d : reselection after won arbitration?\n", instance
->host_no
);
1470 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1474 * No less than two deskew delays after the initiator detects the
1475 * BSY signal is true, it shall release the SEL signal and may
1476 * change the DATA BUS. -wingel
1481 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1483 if (!(NCR5380_read(STATUS_REG
) & SR_BSY
)) {
1484 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1485 if (hostdata
->targets_present
& (1 << scmd_id(cmd
))) {
1486 printk(KERN_DEBUG
"scsi%d : weirdness\n", instance
->host_no
);
1487 if (hostdata
->restart_select
)
1488 printk(KERN_DEBUG
"\trestart select\n");
1489 NCR5380_dprint(NDEBUG_SELECTION
, instance
);
1490 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1493 cmd
->result
= DID_BAD_TARGET
<< 16;
1494 collect_stats(hostdata
, cmd
);
1495 cmd
->scsi_done(cmd
);
1496 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1497 dprintk(NDEBUG_SELECTION
, ("scsi%d : target did not respond within 250ms\n", instance
->host_no
));
1498 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1501 hostdata
->targets_present
|= (1 << scmd_id(cmd
));
1504 * Since we followed the SCSI spec, and raised ATN while SEL
1505 * was true but before BSY was false during selection, the information
1506 * transfer phase should be a MESSAGE OUT phase so that we can send the
1509 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1510 * message (2 bytes) with a tag ID that we increment with every command
1511 * until it wraps back to 0.
1513 * XXX - it turns out that there are some broken SCSI-II devices,
1514 * which claim to support tagged queuing but fail when more than
1515 * some number of commands are issued at once.
1518 /* Wait for start of REQ/ACK handshake */
1520 spin_unlock_irq(instance
->host_lock
);
1521 err
= NCR5380_poll_politely(instance
, STATUS_REG
, SR_REQ
, SR_REQ
, HZ
);
1522 spin_lock_irq(instance
->host_lock
);
1525 printk(KERN_ERR
"scsi%d: timeout at NCR5380.c:%d\n", instance
->host_no
, __LINE__
);
1526 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1530 dprintk(NDEBUG_SELECTION
, ("scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance
->host_no
, cmd
->device
->id
));
1531 tmp
[0] = IDENTIFY(((instance
->irq
== SCSI_IRQ_NONE
) ? 0 : 1), cmd
->device
->lun
);
1536 /* Send message(s) */
1538 phase
= PHASE_MSGOUT
;
1539 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
1540 dprintk(NDEBUG_SELECTION
, ("scsi%d : nexus established.\n", instance
->host_no
));
1541 /* XXX need to handle errors here */
1542 hostdata
->connected
= cmd
;
1543 hostdata
->busy
[cmd
->device
->id
] |= (1 << cmd
->device
->lun
);
1545 initialize_SCp(cmd
);
1549 /* Selection failed */
1556 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1557 * unsigned char *phase, int *count, unsigned char **data)
1559 * Purpose : transfers data in given phase using polled I/O
1561 * Inputs : instance - instance of driver, *phase - pointer to
1562 * what phase is expected, *count - pointer to number of
1563 * bytes to transfer, **data - pointer to data pointer.
1565 * Returns : -1 when different phase is entered without transferring
1566 * maximum number of bytes, 0 if all bytes or transfered or exit
1569 * Also, *phase, *count, *data are modified in place.
1571 * XXX Note : handling for bus free may be useful.
1575 * Note : this code is not as quick as it could be, however it
1576 * IS 100% reliable, and for the actual data transfer where speed
1577 * counts, we will always do a pseudo DMA or DMA transfer.
1580 static int NCR5380_transfer_pio(struct Scsi_Host
*instance
, unsigned char *phase
, int *count
, unsigned char **data
) {
1581 NCR5380_local_declare();
1582 unsigned char p
= *phase
, tmp
;
1584 unsigned char *d
= *data
;
1586 * RvC: some administrative data to process polling time
1588 int break_allowed
= 0;
1589 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*) instance
->hostdata
;
1590 NCR5380_setup(instance
);
1593 dprintk(NDEBUG_PIO
, ("scsi%d : pio write %d bytes\n", instance
->host_no
, c
));
1595 dprintk(NDEBUG_PIO
, ("scsi%d : pio read %d bytes\n", instance
->host_no
, c
));
1598 * The NCR5380 chip will only drive the SCSI bus when the
1599 * phase specified in the appropriate bits of the TARGET COMMAND
1600 * REGISTER match the STATUS REGISTER
1603 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
1605 /* RvC: don't know if this is necessary, but other SCSI I/O is short
1606 * so breaks are not necessary there
1608 if ((p
== PHASE_DATAIN
) || (p
== PHASE_DATAOUT
)) {
1613 * Wait for assertion of REQ, after which the phase bits will be
1617 /* RvC: we simply poll once, after that we stop temporarily
1618 * and let the device buffer fill up
1619 * if breaking is not allowed, we keep polling as long as needed
1623 while (!((tmp
= NCR5380_read(STATUS_REG
)) & SR_REQ
) && !break_allowed
);
1624 if (!(tmp
& SR_REQ
)) {
1625 /* timeout condition */
1626 NCR5380_set_timer(hostdata
, USLEEP_SLEEP
);
1630 dprintk(NDEBUG_HANDSHAKE
, ("scsi%d : REQ detected\n", instance
->host_no
));
1632 /* Check for phase mismatch */
1633 if ((tmp
& PHASE_MASK
) != p
) {
1634 dprintk(NDEBUG_HANDSHAKE
, ("scsi%d : phase mismatch\n", instance
->host_no
));
1635 NCR5380_dprint_phase(NDEBUG_HANDSHAKE
, instance
);
1638 /* Do actual transfer from SCSI bus to / from memory */
1640 NCR5380_write(OUTPUT_DATA_REG
, *d
);
1642 *d
= NCR5380_read(CURRENT_SCSI_DATA_REG
);
1647 * The SCSI standard suggests that in MSGOUT phase, the initiator
1648 * should drop ATN on the last byte of the message phase
1649 * after REQ has been asserted for the handshake but before
1650 * the initiator raises ACK.
1654 if (!((p
& SR_MSG
) && c
> 1)) {
1655 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
);
1656 NCR5380_dprint(NDEBUG_PIO
, instance
);
1657 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
| ICR_ASSERT_ACK
);
1659 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
| ICR_ASSERT_ATN
);
1660 NCR5380_dprint(NDEBUG_PIO
, instance
);
1661 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_ACK
);
1664 NCR5380_dprint(NDEBUG_PIO
, instance
);
1665 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ACK
);
1668 /* FIXME - if this fails bus reset ?? */
1669 NCR5380_poll_politely(instance
, STATUS_REG
, SR_REQ
, 0, 5*HZ
);
1670 dprintk(NDEBUG_HANDSHAKE
, ("scsi%d : req false, handshake complete\n", instance
->host_no
));
1673 * We have several special cases to consider during REQ/ACK handshaking :
1674 * 1. We were in MSGOUT phase, and we are on the last byte of the
1675 * message. ATN must be dropped as ACK is dropped.
1677 * 2. We are in a MSGIN phase, and we are on the last byte of the
1678 * message. We must exit with ACK asserted, so that the calling
1679 * code may raise ATN before dropping ACK to reject the message.
1681 * 3. ACK and ATN are clear and the target may proceed as normal.
1683 if (!(p
== PHASE_MSGIN
&& c
== 1)) {
1684 if (p
== PHASE_MSGOUT
&& c
> 1)
1685 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1687 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1691 dprintk(NDEBUG_PIO
, ("scsi%d : residual %d\n", instance
->host_no
, c
));
1695 tmp
= NCR5380_read(STATUS_REG
);
1697 *phase
= tmp
& PHASE_MASK
;
1699 *phase
= PHASE_UNKNOWN
;
1701 if (!c
|| (*phase
== p
))
1708 * do_reset - issue a reset command
1709 * @host: adapter to reset
1711 * Issue a reset sequence to the NCR5380 and try and get the bus
1712 * back into sane shape.
1714 * Locks: caller holds queue lock
1717 static void do_reset(struct Scsi_Host
*host
) {
1718 NCR5380_local_declare();
1719 NCR5380_setup(host
);
1721 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG
) & PHASE_MASK
));
1722 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_RST
);
1724 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1728 * Function : do_abort (Scsi_Host *host)
1730 * Purpose : abort the currently established nexus. Should only be
1731 * called from a routine which can drop into a
1733 * Returns : 0 on success, -1 on failure.
1735 * Locks: queue lock held by caller
1736 * FIXME: sort this out and get new_eh running
1739 static int do_abort(struct Scsi_Host
*host
) {
1740 NCR5380_local_declare();
1741 unsigned char *msgptr
, phase
, tmp
;
1744 NCR5380_setup(host
);
1747 /* Request message out phase */
1748 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1751 * Wait for the target to indicate a valid phase by asserting
1752 * REQ. Once this happens, we'll have either a MSGOUT phase
1753 * and can immediately send the ABORT message, or we'll have some
1754 * other phase and will have to source/sink data.
1756 * We really don't care what value was on the bus or what value
1757 * the target sees, so we just handshake.
1760 rc
= NCR5380_poll_politely(host
, STATUS_REG
, SR_REQ
, SR_REQ
, 60 * HZ
);
1765 tmp
= (unsigned char)rc
;
1767 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
1769 if ((tmp
& PHASE_MASK
) != PHASE_MSGOUT
) {
1770 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
| ICR_ASSERT_ACK
);
1771 rc
= NCR5380_poll_politely(host
, STATUS_REG
, SR_REQ
, 0, 3*HZ
);
1772 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1779 phase
= PHASE_MSGOUT
;
1780 NCR5380_transfer_pio(host
, &phase
, &len
, &msgptr
);
1783 * If we got here, and the command completed successfully,
1784 * we're about to go into bus free state.
1787 return len
? -1 : 0;
1790 #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL)
1792 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1793 * unsigned char *phase, int *count, unsigned char **data)
1795 * Purpose : transfers data in given phase using either real
1798 * Inputs : instance - instance of driver, *phase - pointer to
1799 * what phase is expected, *count - pointer to number of
1800 * bytes to transfer, **data - pointer to data pointer.
1802 * Returns : -1 when different phase is entered without transferring
1803 * maximum number of bytes, 0 if all bytes or transfered or exit
1806 * Also, *phase, *count, *data are modified in place.
1808 * Locks: io_request lock held by caller
1812 static int NCR5380_transfer_dma(struct Scsi_Host
*instance
, unsigned char *phase
, int *count
, unsigned char **data
) {
1813 NCR5380_local_declare();
1814 register int c
= *count
;
1815 register unsigned char p
= *phase
;
1816 register unsigned char *d
= *data
;
1819 #if defined(REAL_DMA_POLL)
1821 unsigned char saved_data
= 0, overrun
= 0, residue
;
1824 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*) instance
->hostdata
;
1826 NCR5380_setup(instance
);
1828 if ((tmp
= (NCR5380_read(STATUS_REG
) & PHASE_MASK
)) != p
) {
1832 #if defined(REAL_DMA) || defined(REAL_DMA_POLL)
1833 #ifdef READ_OVERRUNS
1838 dprintk(NDEBUG_DMA
, ("scsi%d : initializing DMA channel %d for %s, %d bytes %s %0x\n", instance
->host_no
, instance
->dma_channel
, (p
& SR_IO
) ? "reading" : "writing", c
, (p
& SR_IO
) ? "to" : "from", (unsigned) d
));
1839 hostdata
->dma_len
= (p
& SR_IO
) ? NCR5380_dma_read_setup(instance
, d
, c
) : NCR5380_dma_write_setup(instance
, d
, c
);
1842 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
1845 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
| MR_ENABLE_EOP_INTR
| MR_MONITOR_BSY
);
1846 #elif defined(REAL_DMA_POLL)
1847 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
);
1850 * Note : on my sample board, watch-dog timeouts occurred when interrupts
1851 * were not disabled for the duration of a single DMA transfer, from
1852 * before the setting of DMA mode to after transfer of the last byte.
1855 #if defined(PSEUDO_DMA) && defined(UNSAFE)
1856 spin_unlock_irq(instance
->host_lock
);
1858 /* KLL May need eop and parity in 53c400 */
1859 if (hostdata
->flags
& FLAG_NCR53C400
)
1860 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
| MR_ENABLE_PAR_CHECK
| MR_ENABLE_PAR_INTR
| MR_ENABLE_EOP_INTR
| MR_DMA_MODE
| MR_MONITOR_BSY
);
1862 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
);
1863 #endif /* def REAL_DMA */
1865 dprintk(NDEBUG_DMA
, ("scsi%d : mode reg = 0x%X\n", instance
->host_no
, NCR5380_read(MODE_REG
)));
1868 * On the PAS16 at least I/O recovery delays are not needed here.
1869 * Everyone else seems to want them.
1873 io_recovery_delay(1);
1874 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG
, 0);
1876 io_recovery_delay(1);
1877 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
);
1878 io_recovery_delay(1);
1879 NCR5380_write(START_DMA_SEND_REG
, 0);
1880 io_recovery_delay(1);
1883 #if defined(REAL_DMA_POLL)
1885 tmp
= NCR5380_read(BUS_AND_STATUS_REG
);
1886 } while ((tmp
& BASR_PHASE_MATCH
) && !(tmp
& (BASR_BUSY_ERROR
| BASR_END_DMA_TRANSFER
)));
1889 At this point, either we've completed DMA, or we have a phase mismatch,
1890 or we've unexpectedly lost BUSY (which is a real error).
1892 For write DMAs, we want to wait until the last byte has been
1893 transferred out over the bus before we turn off DMA mode. Alas, there
1894 seems to be no terribly good way of doing this on a 5380 under all
1895 conditions. For non-scatter-gather operations, we can wait until REQ
1896 and ACK both go false, or until a phase mismatch occurs. Gather-writes
1897 are nastier, since the device will be expecting more data than we
1898 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
1899 could test LAST BIT SENT to assure transfer (I imagine this is precisely
1900 why this signal was added to the newer chips) but on the older 538[01]
1901 this signal does not exist. The workaround for this lack is a watchdog;
1902 we bail out of the wait-loop after a modest amount of wait-time if
1903 the usual exit conditions are not met. Not a terribly clean or
1904 correct solution :-%
1906 Reads are equally tricky due to a nasty characteristic of the NCR5380.
1907 If the chip is in DMA mode for an READ, it will respond to a target's
1908 REQ by latching the SCSI data into the INPUT DATA register and asserting
1909 ACK, even if it has _already_ been notified by the DMA controller that
1910 the current DMA transfer has completed! If the NCR5380 is then taken
1911 out of DMA mode, this already-acknowledged byte is lost.
1913 This is not a problem for "one DMA transfer per command" reads, because
1914 the situation will never arise... either all of the data is DMA'ed
1915 properly, or the target switches to MESSAGE IN phase to signal a
1916 disconnection (either operation bringing the DMA to a clean halt).
1917 However, in order to handle scatter-reads, we must work around the
1918 problem. The chosen fix is to DMA N-2 bytes, then check for the
1919 condition before taking the NCR5380 out of DMA mode. One or two extra
1920 bytes are transferred via PIO as necessary to fill out the original
1925 #ifdef READ_OVERRUNS
1927 if (((NCR5380_read(BUS_AND_STATUS_REG
) & (BASR_PHASE_MATCH
| BASR_ACK
)) == (BASR_PHASE_MATCH
| BASR_ACK
))) {
1928 saved_data
= NCR5380_read(INPUT_DATA_REGISTER
);
1934 while (((tmp
= NCR5380_read(BUS_AND_STATUS_REG
)) & BASR_ACK
) || (NCR5380_read(STATUS_REG
) & SR_REQ
)) {
1935 if (!(tmp
& BASR_PHASE_MATCH
))
1942 dprintk(NDEBUG_DMA
, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance
->host_no
, tmp
, NCR5380_read(STATUS_REG
)));
1944 NCR5380_write(MODE_REG
, MR_BASE
);
1945 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1947 residue
= NCR5380_dma_residual(instance
);
1951 *phase
= NCR5380_read(STATUS_REG
) & PHASE_MASK
;
1953 #ifdef READ_OVERRUNS
1954 if (*phase
== p
&& (p
& SR_IO
) && residue
== 0) {
1956 dprintk(NDEBUG_DMA
, ("Got an input overrun, using saved byte\n"));
1957 **data
= saved_data
;
1962 printk("No overrun??\n");
1965 dprintk(NDEBUG_DMA
, ("Doing %d-byte PIO to 0x%X\n", cnt
, *data
));
1966 NCR5380_transfer_pio(instance
, phase
, &cnt
, data
);
1967 *count
-= toPIO
- cnt
;
1971 dprintk(NDEBUG_DMA
, ("Return with data ptr = 0x%X, count %d, last 0x%X, next 0x%X\n", *data
, *count
, *(*data
+ *count
- 1), *(*data
+ *count
)));
1974 #elif defined(REAL_DMA)
1976 #else /* defined(REAL_DMA_POLL) */
1978 #ifdef DMA_WORKS_RIGHT
1979 foo
= NCR5380_pread(instance
, d
, c
);
1982 if (hostdata
->flags
& FLAG_NCR53C400
) {
1985 if (!(foo
= NCR5380_pread(instance
, d
, c
- diff
))) {
1987 * We can't disable DMA mode after successfully transferring
1988 * what we plan to be the last byte, since that would open up
1989 * a race condition where if the target asserted REQ before
1990 * we got the DMA mode reset, the NCR5380 would have latched
1991 * an additional byte into the INPUT DATA register and we'd
1994 * The workaround was to transfer one fewer bytes than we
1995 * intended to with the pseudo-DMA read function, wait for
1996 * the chip to latch the last byte, read it, and then disable
1999 * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
2000 * REQ is deasserted when ACK is asserted, and not reasserted
2001 * until ACK goes false. Since the NCR5380 won't lower ACK
2002 * until DACK is asserted, which won't happen unless we twiddle
2003 * the DMA port or we take the NCR5380 out of DMA mode, we
2004 * can guarantee that we won't handshake another extra
2008 if (!(hostdata
->flags
& FLAG_NCR53C400
)) {
2009 while (!(NCR5380_read(BUS_AND_STATUS_REG
) & BASR_DRQ
));
2010 /* Wait for clean handshake */
2011 while (NCR5380_read(STATUS_REG
) & SR_REQ
);
2012 d
[c
- 1] = NCR5380_read(INPUT_DATA_REG
);
2017 #ifdef DMA_WORKS_RIGHT
2018 foo
= NCR5380_pwrite(instance
, d
, c
);
2021 dprintk(NDEBUG_C400_PWRITE
, ("About to pwrite %d bytes\n", c
));
2022 if (!(foo
= NCR5380_pwrite(instance
, d
, c
))) {
2024 * Wait for the last byte to be sent. If REQ is being asserted for
2025 * the byte we're interested, we'll ACK it and it will go false.
2027 if (!(hostdata
->flags
& FLAG_HAS_LAST_BYTE_SENT
)) {
2029 while (!(NCR5380_read(BUS_AND_STATUS_REG
) & BASR_DRQ
) && (NCR5380_read(BUS_AND_STATUS_REG
) & BASR_PHASE_MATCH
));
2032 dprintk(NDEBUG_LAST_BYTE_SENT
, ("scsi%d : timed out on last byte\n", instance
->host_no
));
2034 if (hostdata
->flags
& FLAG_CHECK_LAST_BYTE_SENT
) {
2035 hostdata
->flags
&= ~FLAG_CHECK_LAST_BYTE_SENT
;
2036 if (NCR5380_read(TARGET_COMMAND_REG
) & TCR_LAST_BYTE_SENT
) {
2037 hostdata
->flags
|= FLAG_HAS_LAST_BYTE_SENT
;
2038 dprintk(NDEBUG_LAST_WRITE_SENT
, ("scsi%d : last bit sent works\n", instance
->host_no
));
2042 dprintk(NDEBUG_C400_PWRITE
, ("Waiting for LASTBYTE\n"));
2043 while (!(NCR5380_read(TARGET_COMMAND_REG
) & TCR_LAST_BYTE_SENT
));
2044 dprintk(NDEBUG_C400_PWRITE
, ("Got LASTBYTE\n"));
2049 NCR5380_write(MODE_REG
, MR_BASE
);
2050 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2052 if ((!(p
& SR_IO
)) && (hostdata
->flags
& FLAG_NCR53C400
)) {
2053 dprintk(NDEBUG_C400_PWRITE
, ("53C400w: Checking for IRQ\n"));
2054 if (NCR5380_read(BUS_AND_STATUS_REG
) & BASR_IRQ
) {
2055 dprintk(NDEBUG_C400_PWRITE
, ("53C400w: got it, reading reset interrupt reg\n"));
2056 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
2058 printk("53C400w: IRQ NOT THERE!\n");
2063 *phase
= NCR5380_read(STATUS_REG
) & PHASE_MASK
;
2064 #if defined(PSEUDO_DMA) && defined(UNSAFE)
2065 spin_lock_irq(instance
->host_lock
);
2066 #endif /* defined(REAL_DMA_POLL) */
2068 #endif /* def REAL_DMA */
2070 #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */
2073 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
2075 * Purpose : run through the various SCSI phases and do as the target
2076 * directs us to. Operates on the currently connected command,
2077 * instance->connected.
2079 * Inputs : instance, instance for which we are doing commands
2081 * Side effects : SCSI things happen, the disconnected queue will be
2082 * modified if a command disconnects, *instance->connected will
2085 * XXX Note : we need to watch for bus free or a reset condition here
2086 * to recover from an unexpected bus free condition.
2088 * Locks: io_request_lock held by caller in IRQ mode
2091 static void NCR5380_information_transfer(struct Scsi_Host
*instance
) {
2092 NCR5380_local_declare();
2093 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*)instance
->hostdata
;
2094 unsigned char msgout
= NOP
;
2097 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2100 unsigned char *data
;
2101 unsigned char phase
, tmp
, extended_msg
[10], old_phase
= 0xff;
2102 Scsi_Cmnd
*cmd
= (Scsi_Cmnd
*) hostdata
->connected
;
2103 /* RvC: we need to set the end of the polling time */
2104 unsigned long poll_time
= jiffies
+ USLEEP_POLL
;
2106 NCR5380_setup(instance
);
2109 tmp
= NCR5380_read(STATUS_REG
);
2110 /* We only have a valid SCSI phase when REQ is asserted */
2112 phase
= (tmp
& PHASE_MASK
);
2113 if (phase
!= old_phase
) {
2115 NCR5380_dprint_phase(NDEBUG_INFORMATION
, instance
);
2117 if (sink
&& (phase
!= PHASE_MSGOUT
)) {
2118 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
2120 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
| ICR_ASSERT_ACK
);
2121 while (NCR5380_read(STATUS_REG
) & SR_REQ
);
2122 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
2129 #if (NDEBUG & NDEBUG_NO_DATAOUT)
2130 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance
->host_no
);
2133 cmd
->result
= DID_ERROR
<< 16;
2134 cmd
->scsi_done(cmd
);
2138 * If there is no room left in the current buffer in the
2139 * scatter-gather list, move onto the next one.
2142 if (!cmd
->SCp
.this_residual
&& cmd
->SCp
.buffers_residual
) {
2144 --cmd
->SCp
.buffers_residual
;
2145 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
2146 cmd
->SCp
.ptr
= sg_virt(cmd
->SCp
.buffer
);
2147 dprintk(NDEBUG_INFORMATION
, ("scsi%d : %d bytes and %d buffers left\n", instance
->host_no
, cmd
->SCp
.this_residual
, cmd
->SCp
.buffers_residual
));
2150 * The preferred transfer method is going to be
2151 * PSEUDO-DMA for systems that are strictly PIO,
2152 * since we can let the hardware do the handshaking.
2154 * For this to work, we need to know the transfersize
2155 * ahead of time, since the pseudo-DMA code will sit
2156 * in an unconditional loop.
2159 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2161 * PSEUDO_DMA is defined here. If this is the g_NCR5380
2162 * driver then it will always be defined, so the
2163 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
2164 * NCR5380 case. I think this is a fairly clean solution.
2165 * We supplement these 2 if's with the flag.
2167 #ifdef NCR5380_dma_xfer_len
2168 if (!cmd
->device
->borken
&& !(hostdata
->flags
& FLAG_NO_PSEUDO_DMA
) && (transfersize
= NCR5380_dma_xfer_len(instance
, cmd
)) != 0) {
2170 transfersize
= cmd
->transfersize
;
2172 #ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */
2173 if (transfersize
> 512)
2175 #endif /* LIMIT_TRANSFERSIZE */
2177 if (!cmd
->device
->borken
&& transfersize
&& !(hostdata
->flags
& FLAG_NO_PSEUDO_DMA
) && cmd
->SCp
.this_residual
&& !(cmd
->SCp
.this_residual
% transfersize
)) {
2178 /* Limit transfers to 32K, for xx400 & xx406
2179 * pseudoDMA that transfers in 128 bytes blocks. */
2180 if (transfersize
> 32 * 1024)
2181 transfersize
= 32 * 1024;
2184 if (NCR5380_transfer_dma(instance
, &phase
, &len
, (unsigned char **) &cmd
->SCp
.ptr
)) {
2186 * If the watchdog timer fires, all future accesses to this
2187 * device will use the polled-IO.
2189 scmd_printk(KERN_INFO
, cmd
,
2190 "switching to slow handshake\n");
2191 cmd
->device
->borken
= 1;
2192 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
2195 cmd
->result
= DID_ERROR
<< 16;
2196 cmd
->scsi_done(cmd
);
2197 /* XXX - need to source or sink data here, as appropriate */
2199 cmd
->SCp
.this_residual
-= transfersize
- len
;
2201 #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */
2202 NCR5380_transfer_pio(instance
, &phase
, (int *) &cmd
->SCp
.this_residual
, (unsigned char **)
2208 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2209 cmd
->SCp
.Message
= tmp
;
2213 * Linking lets us reduce the time required to get the
2214 * next command out to the device, hopefully this will
2215 * mean we don't waste another revolution due to the delays
2216 * required by ARBITRATION and another SELECTION.
2218 * In the current implementation proposal, low level drivers
2219 * merely have to start the next command, pointed to by
2220 * next_link, done() is called as with unlinked commands.
2223 case LINKED_CMD_COMPLETE
:
2224 case LINKED_FLG_CMD_COMPLETE
:
2225 /* Accept message by clearing ACK */
2226 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2227 dprintk(NDEBUG_LINKED
, ("scsi%d : target %d lun %d linked command complete.\n", instance
->host_no
, cmd
->device
->id
, cmd
->device
->lun
));
2229 * Sanity check : A linked command should only terminate with
2230 * one of these messages if there are more linked commands
2233 if (!cmd
->next_link
) {
2234 printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance
->host_no
, cmd
->device
->id
, cmd
->device
->lun
);
2239 initialize_SCp(cmd
->next_link
);
2240 /* The next command is still part of this process */
2241 cmd
->next_link
->tag
= cmd
->tag
;
2242 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
2243 dprintk(NDEBUG_LINKED
, ("scsi%d : target %d lun %d linked request done, calling scsi_done().\n", instance
->host_no
, cmd
->device
->id
, cmd
->device
->lun
));
2244 collect_stats(hostdata
, cmd
);
2245 cmd
->scsi_done(cmd
);
2246 cmd
= hostdata
->connected
;
2248 #endif /* def LINKED */
2250 case COMMAND_COMPLETE
:
2251 /* Accept message by clearing ACK */
2253 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2254 hostdata
->connected
= NULL
;
2255 dprintk(NDEBUG_QUEUES
, ("scsi%d : command for target %d, lun %d completed\n", instance
->host_no
, cmd
->device
->id
, cmd
->device
->lun
));
2256 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2259 * I'm not sure what the correct thing to do here is :
2261 * If the command that just executed is NOT a request
2262 * sense, the obvious thing to do is to set the result
2263 * code to the values of the stored parameters.
2265 * If it was a REQUEST SENSE command, we need some way
2266 * to differentiate between the failure code of the original
2267 * and the failure code of the REQUEST sense - the obvious
2268 * case is success, where we fall through and leave the result
2271 * The non-obvious place is where the REQUEST SENSE failed
2274 if (cmd
->cmnd
[0] != REQUEST_SENSE
)
2275 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
2276 else if (status_byte(cmd
->SCp
.Status
) != GOOD
)
2277 cmd
->result
= (cmd
->result
& 0x00ffff) | (DID_ERROR
<< 16);
2280 if ((cmd
->cmnd
[0] == REQUEST_SENSE
) &&
2281 hostdata
->ses
.cmd_len
) {
2282 scsi_eh_restore_cmnd(cmd
, &hostdata
->ses
);
2283 hostdata
->ses
.cmd_len
= 0 ;
2286 if ((cmd
->cmnd
[0] != REQUEST_SENSE
) && (status_byte(cmd
->SCp
.Status
) == CHECK_CONDITION
)) {
2287 scsi_eh_prep_cmnd(cmd
, &hostdata
->ses
, NULL
, 0, ~0);
2289 dprintk(NDEBUG_AUTOSENSE
, ("scsi%d : performing request sense\n", instance
->host_no
));
2291 LIST(cmd
, hostdata
->issue_queue
);
2292 cmd
->host_scribble
= (unsigned char *)
2293 hostdata
->issue_queue
;
2294 hostdata
->issue_queue
= (Scsi_Cmnd
*) cmd
;
2295 dprintk(NDEBUG_QUEUES
, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance
->host_no
));
2297 #endif /* def AUTOSENSE */
2299 collect_stats(hostdata
, cmd
);
2300 cmd
->scsi_done(cmd
);
2303 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2305 * Restore phase bits to 0 so an interrupted selection,
2306 * arbitration can resume.
2308 NCR5380_write(TARGET_COMMAND_REG
, 0);
2310 while ((NCR5380_read(STATUS_REG
) & SR_BSY
) && !hostdata
->connected
)
2313 case MESSAGE_REJECT
:
2314 /* Accept message by clearing ACK */
2315 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2316 switch (hostdata
->last_message
) {
2317 case HEAD_OF_QUEUE_TAG
:
2318 case ORDERED_QUEUE_TAG
:
2319 case SIMPLE_QUEUE_TAG
:
2320 cmd
->device
->simple_tags
= 0;
2321 hostdata
->busy
[cmd
->device
->id
] |= (1 << cmd
->device
->lun
);
2327 /* Accept message by clearing ACK */
2328 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2329 cmd
->device
->disconnect
= 1;
2330 LIST(cmd
, hostdata
->disconnected_queue
);
2331 cmd
->host_scribble
= (unsigned char *)
2332 hostdata
->disconnected_queue
;
2333 hostdata
->connected
= NULL
;
2334 hostdata
->disconnected_queue
= cmd
;
2335 dprintk(NDEBUG_QUEUES
, ("scsi%d : command for target %d lun %d was moved from connected to" " the disconnected_queue\n", instance
->host_no
, cmd
->device
->id
, cmd
->device
->lun
));
2337 * Restore phase bits to 0 so an interrupted selection,
2338 * arbitration can resume.
2340 NCR5380_write(TARGET_COMMAND_REG
, 0);
2342 /* Enable reselect interrupts */
2343 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2344 /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/
2345 /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */
2346 while ((NCR5380_read(STATUS_REG
) & SR_BSY
) && !hostdata
->connected
)
2351 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2352 * operation, in violation of the SCSI spec so we can safely
2353 * ignore SAVE/RESTORE pointers calls.
2355 * Unfortunately, some disks violate the SCSI spec and
2356 * don't issue the required SAVE_POINTERS message before
2357 * disconnecting, and we have to break spec to remain
2361 case RESTORE_POINTERS
:
2362 /* Accept message by clearing ACK */
2363 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2365 case EXTENDED_MESSAGE
:
2367 * Extended messages are sent in the following format :
2369 * 0 EXTENDED_MESSAGE == 1
2370 * 1 length (includes one byte for code, doesn't
2371 * include first two bytes)
2373 * 3..length+1 arguments
2375 * Start the extended message buffer with the EXTENDED_MESSAGE
2376 * byte, since spi_print_msg() wants the whole thing.
2378 extended_msg
[0] = EXTENDED_MESSAGE
;
2379 /* Accept first byte by clearing ACK */
2380 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2381 dprintk(NDEBUG_EXTENDED
, ("scsi%d : receiving extended message\n", instance
->host_no
));
2384 data
= extended_msg
+ 1;
2385 phase
= PHASE_MSGIN
;
2386 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2388 dprintk(NDEBUG_EXTENDED
, ("scsi%d : length=%d, code=0x%02x\n", instance
->host_no
, (int) extended_msg
[1], (int) extended_msg
[2]));
2390 if (!len
&& extended_msg
[1] <= (sizeof(extended_msg
) - 1)) {
2391 /* Accept third byte by clearing ACK */
2392 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2393 len
= extended_msg
[1] - 1;
2394 data
= extended_msg
+ 3;
2395 phase
= PHASE_MSGIN
;
2397 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2398 dprintk(NDEBUG_EXTENDED
, ("scsi%d : message received, residual %d\n", instance
->host_no
, len
));
2400 switch (extended_msg
[2]) {
2403 case EXTENDED_MODIFY_DATA_POINTER
:
2404 case EXTENDED_EXTENDED_IDENTIFY
:
2408 printk("scsi%d: error receiving extended message\n", instance
->host_no
);
2411 printk("scsi%d: extended message code %02x length %d is too long\n", instance
->host_no
, extended_msg
[2], extended_msg
[1]);
2414 /* Fall through to reject message */
2417 * If we get something weird that we aren't expecting,
2422 printk("scsi%d: rejecting message ", instance
->host_no
);
2423 spi_print_msg(extended_msg
);
2425 } else if (tmp
!= EXTENDED_MESSAGE
)
2426 scmd_printk(KERN_INFO
, cmd
,
2427 "rejecting unknown message %02x\n",tmp
);
2429 scmd_printk(KERN_INFO
, cmd
,
2430 "rejecting unknown extended message code %02x, length %d\n", extended_msg
[1], extended_msg
[0]);
2432 msgout
= MESSAGE_REJECT
;
2433 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
2435 } /* switch (tmp) */
2440 hostdata
->last_message
= msgout
;
2441 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2442 if (msgout
== ABORT
) {
2443 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2444 hostdata
->connected
= NULL
;
2445 cmd
->result
= DID_ERROR
<< 16;
2446 collect_stats(hostdata
, cmd
);
2447 cmd
->scsi_done(cmd
);
2448 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2457 * XXX for performance reasons, on machines with a
2458 * PSEUDO-DMA architecture we should probably
2459 * use the dma transfer function.
2461 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2462 if (!cmd
->device
->disconnect
&& should_disconnect(cmd
->cmnd
[0])) {
2463 NCR5380_set_timer(hostdata
, USLEEP_SLEEP
);
2464 dprintk(NDEBUG_USLEEP
, ("scsi%d : issued command, sleeping until %ul\n", instance
->host_no
, hostdata
->time_expires
));
2471 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2472 cmd
->SCp
.Status
= tmp
;
2475 printk("scsi%d : unknown phase\n", instance
->host_no
);
2476 NCR5380_dprint(NDEBUG_ALL
, instance
);
2477 } /* switch(phase) */
2478 } /* if (tmp * SR_REQ) */
2480 /* RvC: go to sleep if polling time expired
2482 if (!cmd
->device
->disconnect
&& time_after_eq(jiffies
, poll_time
)) {
2483 NCR5380_set_timer(hostdata
, USLEEP_SLEEP
);
2484 dprintk(NDEBUG_USLEEP
, ("scsi%d : poll timed out, sleeping until %ul\n", instance
->host_no
, hostdata
->time_expires
));
2492 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2494 * Purpose : does reselection, initializing the instance->connected
2495 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2496 * nexus has been reestablished,
2498 * Inputs : instance - this instance of the NCR5380.
2500 * Locks: io_request_lock held by caller if IRQ driven
2503 static void NCR5380_reselect(struct Scsi_Host
*instance
) {
2504 NCR5380_local_declare();
2505 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*)
2507 unsigned char target_mask
;
2508 unsigned char lun
, phase
;
2510 unsigned char msg
[3];
2511 unsigned char *data
;
2512 Scsi_Cmnd
*tmp
= NULL
, *prev
;
2514 NCR5380_setup(instance
);
2517 * Disable arbitration, etc. since the host adapter obviously
2518 * lost, and tell an interrupted NCR5380_select() to restart.
2521 NCR5380_write(MODE_REG
, MR_BASE
);
2522 hostdata
->restart_select
= 1;
2524 target_mask
= NCR5380_read(CURRENT_SCSI_DATA_REG
) & ~(hostdata
->id_mask
);
2525 dprintk(NDEBUG_SELECTION
, ("scsi%d : reselect\n", instance
->host_no
));
2528 * At this point, we have detected that our SCSI ID is on the bus,
2529 * SEL is true and BSY was false for at least one bus settle delay
2532 * We must assert BSY ourselves, until the target drops the SEL
2536 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_BSY
);
2538 /* FIXME: timeout too long, must fail to workqueue */
2539 if(NCR5380_poll_politely(instance
, STATUS_REG
, SR_SEL
, 0, 2*HZ
)<0)
2542 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2545 * Wait for target to go into MSGIN.
2546 * FIXME: timeout needed and fail to work queeu
2549 if(NCR5380_poll_politely(instance
, STATUS_REG
, SR_REQ
, SR_REQ
, 2*HZ
))
2554 phase
= PHASE_MSGIN
;
2555 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2557 if (!(msg
[0] & 0x80)) {
2558 printk(KERN_ERR
"scsi%d : expecting IDENTIFY message, got ", instance
->host_no
);
2562 /* Accept message by clearing ACK */
2563 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2564 lun
= (msg
[0] & 0x07);
2567 * We need to add code for SCSI-II to track which devices have
2568 * I_T_L_Q nexuses established, and which have simple I_T_L
2569 * nexuses so we can chose to do additional data transfer.
2573 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2574 * just reestablished, and remove it from the disconnected queue.
2578 for (tmp
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
, prev
= NULL
; tmp
; prev
= tmp
, tmp
= (Scsi_Cmnd
*) tmp
->host_scribble
)
2579 if ((target_mask
== (1 << tmp
->device
->id
)) && (lun
== tmp
->device
->lun
)
2582 REMOVE(prev
, prev
->host_scribble
, tmp
, tmp
->host_scribble
);
2583 prev
->host_scribble
= tmp
->host_scribble
;
2585 REMOVE(-1, hostdata
->disconnected_queue
, tmp
, tmp
->host_scribble
);
2586 hostdata
->disconnected_queue
= (Scsi_Cmnd
*) tmp
->host_scribble
;
2588 tmp
->host_scribble
= NULL
;
2592 printk(KERN_ERR
"scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance
->host_no
, target_mask
, lun
);
2594 * Since we have an established nexus that we can't do anything with,
2604 hostdata
->connected
= tmp
;
2605 dprintk(NDEBUG_RESELECTION
, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance
->host_no
, tmp
->target
, tmp
->lun
, tmp
->tag
));
2610 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
2612 * Purpose : called by interrupt handler when DMA finishes or a phase
2613 * mismatch occurs (which would finish the DMA transfer).
2615 * Inputs : instance - this instance of the NCR5380.
2617 * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L
2618 * nexus has been reestablished, on failure NULL is returned.
2622 static void NCR5380_dma_complete(NCR5380_instance
* instance
) {
2623 NCR5380_local_declare();
2624 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*) instance
->hostdata
;
2626 NCR5380_setup(instance
);
2629 * XXX this might not be right.
2631 * Wait for final byte to transfer, ie wait for ACK to go false.
2633 * We should use the Last Byte Sent bit, unfortunately this is
2634 * not available on the 5380/5381 (only the various CMOS chips)
2636 * FIXME: timeout, and need to handle long timeout/irq case
2639 NCR5380_poll_politely(instance
, BUS_AND_STATUS_REG
, BASR_ACK
, 0, 5*HZ
);
2641 NCR5380_write(MODE_REG
, MR_BASE
);
2642 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2645 * The only places we should see a phase mismatch and have to send
2646 * data from the same set of pointers will be the data transfer
2647 * phases. So, residual, requested length are only important here.
2650 if (!(hostdata
->connected
->SCp
.phase
& SR_CD
)) {
2651 transferred
= instance
->dmalen
- NCR5380_dma_residual();
2652 hostdata
->connected
->SCp
.this_residual
-= transferred
;
2653 hostdata
->connected
->SCp
.ptr
+= transferred
;
2656 #endif /* def REAL_DMA */
2659 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2661 * Purpose : abort a command
2663 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2664 * host byte of the result field to, if zero DID_ABORTED is
2667 * Returns : 0 - success, -1 on failure.
2669 * XXX - there is no way to abort the command that is currently
2670 * connected, you have to wait for it to complete. If this is
2671 * a problem, we could implement longjmp() / setjmp(), setjmp()
2672 * called where the loop started in NCR5380_main().
2674 * Locks: host lock taken by caller
2677 static int NCR5380_abort(Scsi_Cmnd
* cmd
) {
2678 NCR5380_local_declare();
2679 struct Scsi_Host
*instance
= cmd
->device
->host
;
2680 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*) instance
->hostdata
;
2681 Scsi_Cmnd
*tmp
, **prev
;
2683 printk(KERN_WARNING
"scsi%d : aborting command\n", instance
->host_no
);
2684 scsi_print_command(cmd
);
2686 NCR5380_print_status(instance
);
2688 NCR5380_setup(instance
);
2690 dprintk(NDEBUG_ABORT
, ("scsi%d : abort called\n", instance
->host_no
));
2691 dprintk(NDEBUG_ABORT
, (" basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG
), NCR5380_read(STATUS_REG
)));
2695 * Case 1 : If the command is the currently executing command,
2696 * we'll set the aborted flag and return control so that
2697 * information transfer routine can exit cleanly.
2700 if (hostdata
->connected
== cmd
) {
2701 dprintk(NDEBUG_ABORT
, ("scsi%d : aborting connected command\n", instance
->host_no
));
2702 hostdata
->aborted
= 1;
2704 * We should perform BSY checking, and make sure we haven't slipped
2708 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_ASSERT_ATN
);
2710 * Since we can't change phases until we've completed the current
2711 * handshake, we have to source or sink a byte of data if the current
2712 * phase is not MSGOUT.
2716 * Return control to the executing NCR drive so we can clear the
2717 * aborted flag and get back into our main loop.
2725 * Case 2 : If the command hasn't been issued yet, we simply remove it
2726 * from the issue queue.
2729 dprintk(NDEBUG_ABORT
, ("scsi%d : abort going into loop.\n", instance
->host_no
));
2730 for (prev
= (Scsi_Cmnd
**) & (hostdata
->issue_queue
), tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
; tmp
; prev
= (Scsi_Cmnd
**) & (tmp
->host_scribble
), tmp
= (Scsi_Cmnd
*) tmp
->host_scribble
)
2732 REMOVE(5, *prev
, tmp
, tmp
->host_scribble
);
2733 (*prev
) = (Scsi_Cmnd
*) tmp
->host_scribble
;
2734 tmp
->host_scribble
= NULL
;
2735 tmp
->result
= DID_ABORT
<< 16;
2736 dprintk(NDEBUG_ABORT
, ("scsi%d : abort removed command from issue queue.\n", instance
->host_no
));
2737 tmp
->scsi_done(tmp
);
2740 #if (NDEBUG & NDEBUG_ABORT)
2742 else if (prev
== tmp
)
2743 printk(KERN_ERR
"scsi%d : LOOP\n", instance
->host_no
);
2747 * Case 3 : If any commands are connected, we're going to fail the abort
2748 * and let the high level SCSI driver retry at a later time or
2751 * Timeouts, and therefore aborted commands, will be highly unlikely
2752 * and handling them cleanly in this situation would make the common
2753 * case of noresets less efficient, and would pollute our code. So,
2757 if (hostdata
->connected
) {
2758 dprintk(NDEBUG_ABORT
, ("scsi%d : abort failed, command connected.\n", instance
->host_no
));
2762 * Case 4: If the command is currently disconnected from the bus, and
2763 * there are no connected commands, we reconnect the I_T_L or
2764 * I_T_L_Q nexus associated with it, go into message out, and send
2767 * This case is especially ugly. In order to reestablish the nexus, we
2768 * need to call NCR5380_select(). The easiest way to implement this
2769 * function was to abort if the bus was busy, and let the interrupt
2770 * handler triggered on the SEL for reselect take care of lost arbitrations
2771 * where necessary, meaning interrupts need to be enabled.
2773 * When interrupts are enabled, the queues may change - so we
2774 * can't remove it from the disconnected queue before selecting it
2775 * because that could cause a failure in hashing the nexus if that
2776 * device reselected.
2778 * Since the queues may change, we can't use the pointers from when we
2781 * So, we must first locate the command, and if NCR5380_select()
2782 * succeeds, then issue the abort, relocate the command and remove
2783 * it from the disconnected queue.
2786 for (tmp
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
; tmp
; tmp
= (Scsi_Cmnd
*) tmp
->host_scribble
)
2788 dprintk(NDEBUG_ABORT
, ("scsi%d : aborting disconnected command.\n", instance
->host_no
));
2790 if (NCR5380_select(instance
, cmd
, (int) cmd
->tag
))
2792 dprintk(NDEBUG_ABORT
, ("scsi%d : nexus reestablished.\n", instance
->host_no
));
2796 for (prev
= (Scsi_Cmnd
**) & (hostdata
->disconnected_queue
), tmp
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
; tmp
; prev
= (Scsi_Cmnd
**) & (tmp
->host_scribble
), tmp
= (Scsi_Cmnd
*) tmp
->host_scribble
)
2798 REMOVE(5, *prev
, tmp
, tmp
->host_scribble
);
2799 *prev
= (Scsi_Cmnd
*) tmp
->host_scribble
;
2800 tmp
->host_scribble
= NULL
;
2801 tmp
->result
= DID_ABORT
<< 16;
2802 tmp
->scsi_done(tmp
);
2807 * Case 5 : If we reached this point, the command was not found in any of
2810 * We probably reached this point because of an unlikely race condition
2811 * between the command completing successfully and the abortion code,
2812 * so we won't panic, but we will notify the user in case something really
2815 printk(KERN_WARNING
"scsi%d : warning : SCSI command probably completed successfully\n"
2816 " before abortion\n", instance
->host_no
);
2822 * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd)
2824 * Purpose : reset the SCSI bus.
2828 * Locks: host lock taken by caller
2831 static int NCR5380_bus_reset(Scsi_Cmnd
* cmd
)
2833 struct Scsi_Host
*instance
= cmd
->device
->host
;
2835 NCR5380_local_declare();
2836 NCR5380_setup(instance
);
2837 NCR5380_print_status(instance
);
2839 spin_lock_irq(instance
->host_lock
);
2841 spin_unlock_irq(instance
->host_lock
);