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 * Revision 1.10 1998/9/2 Alan Cox
31 * (alan@lxorguk.ukuu.org.uk)
32 * Fixed up the timer lockups reported so far. Things still suck. Looking
33 * forward to 2.3 and per device request queues. Then it'll be possible to
34 * SMP thread this beast and improve life no end.
36 * Revision 1.9 1997/7/27 Ronald van Cuijlenborg
37 * (ronald.van.cuijlenborg@tip.nl or nutty@dds.nl)
38 * (hopefully) fixed and enhanced USLEEP
39 * added support for DTC3181E card (for Mustek scanner)
42 * Revision 1.8 Ingmar Baumgart
43 * (ingmar@gonzo.schwaben.de)
44 * added support for NCR53C400a card
47 * Revision 1.7 1996/3/2 Ray Van Tassle (rayvt@comm.mot.com)
49 * added support needed for DTC 3180/3280
50 * fixed a couple of bugs
53 * Revision 1.5 1994/01/19 09:14:57 drew
54 * Fixed udelay() hack that was being used on DATAOUT phases
55 * instead of a proper wait for the final handshake.
57 * Revision 1.4 1994/01/19 06:44:25 drew
58 * *** empty log message ***
60 * Revision 1.3 1994/01/19 05:24:40 drew
61 * Added support for TCR LAST_BYTE_SENT bit.
63 * Revision 1.2 1994/01/15 06:14:11 drew
64 * REAL DMA support, bug fixes.
66 * Revision 1.1 1994/01/15 06:00:54 drew
72 * Further development / testing that should be done :
73 * 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete
74 * code so that everything does the same thing that's done at the
75 * end of a pseudo-DMA read operation.
77 * 2. Fix REAL_DMA (interrupt driven, polled works fine) -
78 * basically, transfer size needs to be reduced by one
79 * and the last byte read as is done with PSEUDO_DMA.
81 * 4. Test SCSI-II tagged queueing (I have no devices which support
84 * 5. Test linked command handling code after Eric is ready with
85 * the high level code.
87 #include <scsi/scsi_dbg.h>
88 #include <scsi/scsi_transport_spi.h>
90 #if (NDEBUG & NDEBUG_LISTS)
91 #define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); }
92 #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); }
95 #define REMOVE(w,x,y,z)
105 #define READ_OVERRUNS
108 #ifdef BOARD_REQUIRES_NO_DELAY
109 #define io_recovery_delay(x)
111 #define io_recovery_delay(x) udelay(x)
117 * This is a generic 5380 driver. To use it on a different platform,
118 * one simply writes appropriate system specific macros (ie, data
119 * transfer - some PC's will use the I/O bus, 68K's must use
120 * memory mapped) and drops this file in their 'C' wrapper.
122 * (Note from hch: unfortunately it was not enough for the different
123 * m68k folks and instead of improving this driver they copied it
124 * and hacked it up for their needs. As a consequence they lost
125 * most updates to this driver. Maybe someone will fix all these
126 * drivers to use a common core one day..)
128 * As far as command queueing, two queues are maintained for
129 * each 5380 in the system - commands that haven't been issued yet,
130 * and commands that are currently executing. This means that an
131 * unlimited number of commands may be queued, letting
132 * more commands propagate from the higher driver levels giving higher
133 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
134 * allowing multiple commands to propagate all the way to a SCSI-II device
135 * while a command is already executing.
138 * Issues specific to the NCR5380 :
140 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
141 * piece of hardware that requires you to sit in a loop polling for
142 * the REQ signal as long as you are connected. Some devices are
143 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
144 * while doing long seek operations.
146 * The workaround for this is to keep track of devices that have
147 * disconnected. If the device hasn't disconnected, for commands that
148 * should disconnect, we do something like
150 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
152 * Some tweaking of N and M needs to be done. An algorithm based
153 * on "time to data" would give the best results as long as short time
154 * to datas (ie, on the same track) were considered, however these
155 * broken devices are the exception rather than the rule and I'd rather
156 * spend my time optimizing for the normal case.
160 * At the heart of the design is a coroutine, NCR5380_main,
161 * which is started from a workqueue for each NCR5380 host in the
162 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by
163 * removing the commands from the issue queue and calling
164 * NCR5380_select() if a nexus is not established.
166 * Once a nexus is established, the NCR5380_information_transfer()
167 * phase goes through the various phases as instructed by the target.
168 * if the target goes into MSG IN and sends a DISCONNECT message,
169 * the command structure is placed into the per instance disconnected
170 * queue, and NCR5380_main tries to find more work. If the target is
171 * idle for too long, the system will try to sleep.
173 * If a command has disconnected, eventually an interrupt will trigger,
174 * calling NCR5380_intr() which will in turn call NCR5380_reselect
175 * to reestablish a nexus. This will run main if necessary.
177 * On command termination, the done function will be called as
180 * SCSI pointers are maintained in the SCp field of SCSI command
181 * structures, being initialized after the command is connected
182 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
183 * Note that in violation of the standard, an implicit SAVE POINTERS operation
184 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
189 * This file a skeleton Linux SCSI driver for the NCR 5380 series
190 * of chips. To use it, you write an architecture specific functions
191 * and macros and include this file in your driver.
193 * These macros control options :
194 * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be
197 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
198 * for commands that return with a CHECK CONDITION status.
200 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
203 * DONT_USE_INTR - if defined, never use interrupts, even if we probe or
204 * override-configure an IRQ.
206 * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512
207 * bytes at a time. Since interrupts are disabled by default during
208 * these transfers, we might need this to give reasonable interrupt
209 * service time if the transfer size gets too large.
211 * LINKED - if defined, linked commands are supported.
213 * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases.
215 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
217 * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't
218 * rely on phase mismatch and EOP interrupts to determine end
221 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You
222 * only really want to use this if you're having a problem with
223 * dropped characters during high speed communications, and even
224 * then, you're going to be better off twiddling with transfersize
225 * in the high level code.
227 * Defaults for these will be provided although the user may want to adjust
228 * these to allocate CPU resources to the SCSI driver or "real" code.
230 * USLEEP_SLEEP - amount of time, in jiffies, to sleep
232 * USLEEP_POLL - amount of time, in jiffies, to poll
234 * These macros MUST be defined :
235 * NCR5380_local_declare() - declare any local variables needed for your
238 * NCR5380_setup(instance) - initialize any local variables needed from a given
239 * instance of the host adapter for NCR5380_{read,write,pread,pwrite}
241 * NCR5380_read(register) - read from the specified register
243 * NCR5380_write(register, value) - write to the specific register
245 * NCR5380_implementation_fields - additional fields needed for this
246 * specific implementation of the NCR5380
248 * Either real DMA *or* pseudo DMA may be implemented
250 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
251 * Note that the DMA setup functions should return the number of bytes
252 * that they were able to program the controller for.
254 * Also note that generic i386/PC versions of these macros are
255 * available as NCR5380_i386_dma_write_setup,
256 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
258 * NCR5380_dma_write_setup(instance, src, count) - initialize
259 * NCR5380_dma_read_setup(instance, dst, count) - initialize
260 * NCR5380_dma_residual(instance); - residual count
263 * NCR5380_pwrite(instance, src, count)
264 * NCR5380_pread(instance, dst, count);
266 * The generic driver is initialized by calling NCR5380_init(instance),
267 * after setting the appropriate host specific fields and ID. If the
268 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
269 * possible) function may be used.
272 static int do_abort(struct Scsi_Host *host);
273 static void do_reset(struct Scsi_Host *host);
276 * initialize_SCp - init the scsi pointer field
277 * @cmd: command block to set up
279 * Set up the internal fields in the SCSI command.
282 static __inline__ void initialize_SCp(Scsi_Cmnd * cmd)
285 * Initialize the Scsi Pointer field so that all of the commands in the
286 * various queues are valid.
289 if (scsi_bufflen(cmd)) {
290 cmd->SCp.buffer = scsi_sglist(cmd);
291 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
292 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
293 cmd->SCp.this_residual = cmd->SCp.buffer->length;
295 cmd->SCp.buffer = NULL;
296 cmd->SCp.buffers_residual = 0;
298 cmd->SCp.this_residual = 0;
303 * NCR5380_poll_politely - wait for NCR5380 status bits
304 * @instance: controller to poll
305 * @reg: 5380 register to poll
306 * @bit: Bitmask to check
307 * @val: Value required to exit
309 * Polls the NCR5380 in a reasonably efficient manner waiting for
310 * an event to occur, after a short quick poll we begin giving the
311 * CPU back in non IRQ contexts
313 * Returns the value of the register or a negative error code.
316 static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t)
318 NCR5380_local_declare();
319 int n = 500; /* At about 8uS a cycle for the cpu access */
320 unsigned long end = jiffies + t;
323 NCR5380_setup(instance);
327 r = NCR5380_read(reg);
334 while(time_before(jiffies, end))
336 r = NCR5380_read(reg);
350 } phases[] __maybe_unused = {
351 {PHASE_DATAOUT, "DATAOUT"},
352 {PHASE_DATAIN, "DATAIN"},
353 {PHASE_CMDOUT, "CMDOUT"},
354 {PHASE_STATIN, "STATIN"},
355 {PHASE_MSGOUT, "MSGOUT"},
356 {PHASE_MSGIN, "MSGIN"},
357 {PHASE_UNKNOWN, "UNKNOWN"}
381 {ICR_ASSERT_RST, "ASSERT RST"},
382 {ICR_ASSERT_ACK, "ASSERT ACK"},
383 {ICR_ASSERT_BSY, "ASSERT BSY"},
384 {ICR_ASSERT_SEL, "ASSERT SEL"},
385 {ICR_ASSERT_ATN, "ASSERT ATN"},
386 {ICR_ASSERT_DATA, "ASSERT DATA"},
390 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"},
391 {MR_TARGET, "MODE TARGET"},
392 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"},
393 {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"},
394 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
395 {MR_DMA_MODE, "MODE DMA"},
396 {MR_ARBITRATE, "MODE ARBITRATION"},
401 * NCR5380_print - print scsi bus signals
402 * @instance: adapter state to dump
404 * Print the SCSI bus signals for debugging purposes
406 * Locks: caller holds hostdata lock (not essential)
409 static void NCR5380_print(struct Scsi_Host *instance)
411 NCR5380_local_declare();
412 unsigned char status, data, basr, mr, icr, i;
413 NCR5380_setup(instance);
415 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
416 status = NCR5380_read(STATUS_REG);
417 mr = NCR5380_read(MODE_REG);
418 icr = NCR5380_read(INITIATOR_COMMAND_REG);
419 basr = NCR5380_read(BUS_AND_STATUS_REG);
421 printk("STATUS_REG: %02x ", status);
422 for (i = 0; signals[i].mask; ++i)
423 if (status & signals[i].mask)
424 printk(",%s", signals[i].name);
425 printk("\nBASR: %02x ", basr);
426 for (i = 0; basrs[i].mask; ++i)
427 if (basr & basrs[i].mask)
428 printk(",%s", basrs[i].name);
429 printk("\nICR: %02x ", icr);
430 for (i = 0; icrs[i].mask; ++i)
431 if (icr & icrs[i].mask)
432 printk(",%s", icrs[i].name);
433 printk("\nMODE: %02x ", mr);
434 for (i = 0; mrs[i].mask; ++i)
435 if (mr & mrs[i].mask)
436 printk(",%s", mrs[i].name);
442 * NCR5380_print_phase - show SCSI phase
443 * @instance: adapter to dump
445 * Print the current SCSI phase for debugging purposes
450 static void NCR5380_print_phase(struct Scsi_Host *instance)
452 NCR5380_local_declare();
453 unsigned char status;
455 NCR5380_setup(instance);
457 status = NCR5380_read(STATUS_REG);
458 if (!(status & SR_REQ))
459 printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no);
461 for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i);
462 printk("scsi%d : phase %s\n", instance->host_no, phases[i].name);
468 * These need tweaking, and would probably work best as per-device
469 * flags initialized differently for disk, tape, cd, etc devices.
470 * People with broken devices are free to experiment as to what gives
471 * the best results for them.
473 * USLEEP_SLEEP should be a minimum seek time.
475 * USLEEP_POLL should be a maximum rotational latency.
478 /* 20 ms (reasonable hard disk speed) */
479 #define USLEEP_SLEEP (20*HZ/1000)
481 /* 300 RPM (floppy speed) */
483 #define USLEEP_POLL (200*HZ/1000)
485 #ifndef USLEEP_WAITLONG
486 /* RvC: (reasonable time to wait on select error) */
487 #define USLEEP_WAITLONG USLEEP_SLEEP
491 * Function : int should_disconnect (unsigned char cmd)
493 * Purpose : decide whether a command would normally disconnect or
494 * not, since if it won't disconnect we should go to sleep.
496 * Input : cmd - opcode of SCSI command
498 * Returns : DISCONNECT_LONG if we should disconnect for a really long
499 * time (ie always, sleep, look for REQ active, sleep),
500 * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal
501 * time-to-data delay, DISCONNECT_NONE if this command would return
504 * Future sleep algorithms based on time to data can exploit
505 * something like this so they can differentiate between "normal"
506 * (ie, read, write, seek) and unusual commands (ie, * format).
508 * Note : We don't deal with commands that handle an immediate disconnect,
512 static int should_disconnect(unsigned char cmd)
521 return DISCONNECT_TIME_TO_DATA;
526 return DISCONNECT_LONG;
528 return DISCONNECT_NONE;
532 static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout)
534 hostdata->time_expires = jiffies + timeout;
535 schedule_delayed_work(&hostdata->coroutine, timeout);
539 static int probe_irq __initdata = 0;
542 * probe_intr - helper for IRQ autoprobe
543 * @irq: interrupt number
547 * Set a flag to indicate the IRQ in question was received. This is
548 * used by the IRQ probe code.
551 static irqreturn_t __init probe_intr(int irq, void *dev_id)
558 * NCR5380_probe_irq - find the IRQ of an NCR5380
559 * @instance: NCR5380 controller
560 * @possible: bitmask of ISA IRQ lines
562 * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ
563 * and then looking to see what interrupt actually turned up.
565 * Locks: none, irqs must be enabled on entry
568 static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance,
571 NCR5380_local_declare();
572 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
573 unsigned long timeout;
574 int trying_irqs, i, mask;
575 NCR5380_setup(instance);
577 for (trying_irqs = 0, i = 1, mask = 2; i < 16; ++i, mask <<= 1)
578 if ((mask & possible) && (request_irq(i, &probe_intr, 0, "NCR-probe", NULL) == 0))
581 timeout = jiffies + (250 * HZ / 1000);
585 * A interrupt is triggered whenever BSY = false, SEL = true
586 * and a bit set in the SELECT_ENABLE_REG is asserted on the
589 * Note that the bus is only driven when the phase control signals
590 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that
594 NCR5380_write(TARGET_COMMAND_REG, 0);
595 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
596 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
597 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL);
599 while (probe_irq == NO_IRQ && time_before(jiffies, timeout))
600 schedule_timeout_uninterruptible(1);
602 NCR5380_write(SELECT_ENABLE_REG, 0);
603 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
605 for (i = 1, mask = 2; i < 16; ++i, mask <<= 1)
606 if (trying_irqs & mask)
613 * NCR58380_info - report driver and host information
614 * @instance: relevant scsi host instance
616 * For use as the host template info() handler.
621 static const char *NCR5380_info(struct Scsi_Host *instance)
623 struct NCR5380_hostdata *hostdata = shost_priv(instance);
625 return hostdata->info;
628 static void prepare_info(struct Scsi_Host *instance)
630 struct NCR5380_hostdata *hostdata = shost_priv(instance);
632 snprintf(hostdata->info, sizeof(hostdata->info),
633 "%s, io_port 0x%lx, n_io_port %d, "
634 "base 0x%lx, irq %d, "
635 "can_queue %d, cmd_per_lun %d, "
636 "sg_tablesize %d, this_id %d, "
638 #if defined(USLEEP_POLL) && defined(USLEEP_WAITLONG)
639 "USLEEP_POLL %d, USLEEP_WAITLONG %d, "
642 instance->hostt->name, instance->io_port, instance->n_io_port,
643 instance->base, instance->irq,
644 instance->can_queue, instance->cmd_per_lun,
645 instance->sg_tablesize, instance->this_id,
646 hostdata->flags & FLAG_NCR53C400 ? "NCR53C400 " : "",
647 hostdata->flags & FLAG_DTC3181E ? "DTC3181E " : "",
648 hostdata->flags & FLAG_NO_PSEUDO_DMA ? "NO_PSEUDO_DMA " : "",
649 #if defined(USLEEP_POLL) && defined(USLEEP_WAITLONG)
650 USLEEP_POLL, USLEEP_WAITLONG,
680 * NCR5380_print_status - dump controller info
681 * @instance: controller to dump
683 * Print commands in the various queues, called from NCR5380_abort
684 * and NCR5380_debug to aid debugging.
686 * Locks: called functions disable irqs
689 static void NCR5380_print_status(struct Scsi_Host *instance)
691 NCR5380_dprint(NDEBUG_ANY, instance);
692 NCR5380_dprint_phase(NDEBUG_ANY, instance);
695 /******************************************/
697 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
699 * *buffer: I/O buffer
700 * **start: if inout == FALSE pointer into buffer where user read should start
701 * offset: current offset
702 * length: length of buffer
703 * hostno: Scsi_Host host_no
704 * inout: TRUE - user is writing; FALSE - user is reading
706 * Return the number of bytes read from or written
709 static int __maybe_unused NCR5380_write_info(struct Scsi_Host *instance,
710 char *buffer, int length)
712 #ifdef DTC_PUBLIC_RELEASE
713 dtc_wmaxi = dtc_maxi = 0;
715 #ifdef PAS16_PUBLIC_RELEASE
716 pas_wmaxi = pas_maxi = 0;
718 return (-ENOSYS); /* Currently this is a no-op */
722 #define SPRINTF(args...) seq_printf(m, ## args)
724 void lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, struct seq_file *m);
726 void lprint_command(unsigned char *cmd, struct seq_file *m);
728 void lprint_opcode(int opcode, struct seq_file *m);
730 static int __maybe_unused NCR5380_show_info(struct seq_file *m,
731 struct Scsi_Host *instance)
733 struct NCR5380_hostdata *hostdata;
736 hostdata = (struct NCR5380_hostdata *) instance->hostdata;
738 SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE);
739 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400)
740 SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE);
741 #ifdef DTC_PUBLIC_RELEASE
742 SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE);
744 #ifdef T128_PUBLIC_RELEASE
745 SPRINTF("T128 release %d", T128_PUBLIC_RELEASE);
747 #ifdef GENERIC_NCR5380_PUBLIC_RELEASE
748 SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE);
750 #ifdef PAS16_PUBLIC_RELEASE
751 SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE);
754 #ifdef DTC_PUBLIC_RELEASE
755 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi);
757 #ifdef PAS16_PUBLIC_RELEASE
758 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi);
760 spin_lock_irq(instance->host_lock);
761 if (!hostdata->connected)
762 SPRINTF("scsi%d: no currently connected command\n", instance->host_no);
764 lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, m);
765 SPRINTF("scsi%d: issue_queue\n", instance->host_no);
766 for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
767 lprint_Scsi_Cmnd(ptr, m);
769 SPRINTF("scsi%d: disconnected_queue\n", instance->host_no);
770 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
771 lprint_Scsi_Cmnd(ptr, m);
772 spin_unlock_irq(instance->host_lock);
776 static void lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, struct seq_file *m)
778 SPRINTF("scsi%d : destination target %d, lun %llu\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun);
779 SPRINTF(" command = ");
780 lprint_command(cmd->cmnd, m);
783 static void lprint_command(unsigned char *command, struct seq_file *m)
786 lprint_opcode(command[0], m);
787 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
788 SPRINTF("%02x ", command[i]);
792 static void lprint_opcode(int opcode, struct seq_file *m)
794 SPRINTF("%2d (0x%02x)", opcode, opcode);
799 * NCR5380_init - initialise an NCR5380
800 * @instance: adapter to configure
801 * @flags: control flags
803 * Initializes *instance and corresponding 5380 chip,
804 * with flags OR'd into the initial flags value.
806 * Notes : I assume that the host, hostno, and id bits have been
807 * set correctly. I don't care about the irq and other fields.
809 * Returns 0 for success
811 * Locks: interrupts must be enabled when we are called
814 static int NCR5380_init(struct Scsi_Host *instance, int flags)
816 NCR5380_local_declare();
818 unsigned long timeout;
819 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
822 printk(KERN_ERR "NCR5380_init called with interrupts off!\n");
824 * On NCR53C400 boards, NCR5380 registers are mapped 8 past
829 if (flags & FLAG_NCR53C400)
830 instance->NCR5380_instance_name += NCR53C400_address_adjust;
833 NCR5380_setup(instance);
835 hostdata->aborted = 0;
836 hostdata->id_mask = 1 << instance->this_id;
837 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
838 if (i > hostdata->id_mask)
839 hostdata->id_higher_mask |= i;
840 for (i = 0; i < 8; ++i)
841 hostdata->busy[i] = 0;
843 hostdata->dmalen = 0;
845 hostdata->targets_present = 0;
846 hostdata->connected = NULL;
847 hostdata->issue_queue = NULL;
848 hostdata->disconnected_queue = NULL;
850 INIT_DELAYED_WORK(&hostdata->coroutine, NCR5380_main);
852 /* The CHECK code seems to break the 53C400. Will check it later maybe */
853 if (flags & FLAG_NCR53C400)
854 hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags;
856 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags;
858 hostdata->host = instance;
859 hostdata->time_expires = 0;
861 prepare_info(instance);
863 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
864 NCR5380_write(MODE_REG, MR_BASE);
865 NCR5380_write(TARGET_COMMAND_REG, 0);
866 NCR5380_write(SELECT_ENABLE_REG, 0);
869 if (hostdata->flags & FLAG_NCR53C400) {
870 NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
875 * Detect and correct bus wedge problems.
877 * If the system crashed, it may have crashed in a state
878 * where a SCSI command was still executing, and the
879 * SCSI bus is not in a BUS FREE STATE.
881 * If this is the case, we'll try to abort the currently
882 * established nexus which we know nothing about, and that
883 * failing, do a hard reset of the SCSI bus
886 for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) {
891 printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no);
892 timeout = jiffies + 5 * HZ;
893 NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ);
896 printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no);
900 printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no);
904 printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no);
912 * NCR5380_exit - remove an NCR5380
913 * @instance: adapter to remove
916 static void NCR5380_exit(struct Scsi_Host *instance)
918 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
920 cancel_delayed_work_sync(&hostdata->coroutine);
924 * NCR5380_queue_command - queue a command
926 * @done: completion handler
928 * cmd is added to the per instance issue_queue, with minor
929 * twiddling done to the host specific fields of cmd. If the
930 * main coroutine is not running, it is restarted.
932 * Locks: host lock taken by caller
935 static int NCR5380_queue_command_lck(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
937 struct Scsi_Host *instance = cmd->device->host;
938 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
941 #if (NDEBUG & NDEBUG_NO_WRITE)
942 switch (cmd->cmnd[0]) {
945 printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no);
946 cmd->result = (DID_ERROR << 16);
950 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
953 * We use the host_scribble field as a pointer to the next command
957 cmd->host_scribble = NULL;
958 cmd->scsi_done = done;
962 * Insert the cmd into the issue queue. Note that REQUEST SENSE
963 * commands are added to the head of the queue since any command will
964 * clear the contingent allegiance condition that exists and the
965 * sense data is only guaranteed to be valid while the condition exists.
968 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
969 LIST(cmd, hostdata->issue_queue);
970 cmd->host_scribble = (unsigned char *) hostdata->issue_queue;
971 hostdata->issue_queue = cmd;
973 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble);
975 tmp->host_scribble = (unsigned char *) cmd;
977 dprintk(NDEBUG_QUEUES, "scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
979 /* Run the coroutine if it isn't already running. */
980 /* Kick off command processing */
981 schedule_delayed_work(&hostdata->coroutine, 0);
985 static DEF_SCSI_QCMD(NCR5380_queue_command)
988 * NCR5380_main - NCR state machines
990 * NCR5380_main is a coroutine that runs as long as more work can
991 * be done on the NCR5380 host adapters in a system. Both
992 * NCR5380_queue_command() and NCR5380_intr() will try to start it
993 * in case it is not running.
995 * Locks: called as its own thread with no locks held. Takes the
996 * host lock and called routines may take the isa dma lock.
999 static void NCR5380_main(struct work_struct *work)
1001 struct NCR5380_hostdata *hostdata =
1002 container_of(work, struct NCR5380_hostdata, coroutine.work);
1003 struct Scsi_Host *instance = hostdata->host;
1004 Scsi_Cmnd *tmp, *prev;
1007 spin_lock_irq(instance->host_lock);
1009 /* Lock held here */
1011 if (!hostdata->connected && !hostdata->selecting) {
1012 dprintk(NDEBUG_MAIN, "scsi%d : not connected\n", instance->host_no);
1014 * Search through the issue_queue for a command destined
1015 * for a target that's not busy.
1017 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
1020 dprintk(NDEBUG_LISTS, "MAIN tmp=%p target=%d busy=%d lun=%llu\n", tmp, tmp->device->id, hostdata->busy[tmp->device->id], tmp->device->lun);
1021 /* When we find one, remove it from the issue queue. */
1022 if (!(hostdata->busy[tmp->device->id] &
1023 (1 << (u8)(tmp->device->lun & 0xff)))) {
1025 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
1026 prev->host_scribble = tmp->host_scribble;
1028 REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble);
1029 hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble;
1031 tmp->host_scribble = NULL;
1034 * Attempt to establish an I_T_L nexus here.
1035 * On success, instance->hostdata->connected is set.
1036 * On failure, we must add the command back to the
1037 * issue queue so we can keep trying.
1039 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, "scsi%d : main() : command for target %d lun %llu removed from issue_queue\n", instance->host_no, tmp->device->id, tmp->device->lun);
1042 * A successful selection is defined as one that
1043 * leaves us with the command connected and
1044 * in hostdata->connected, OR has terminated the
1047 * With successful commands, we fall through
1048 * and see if we can do an information transfer,
1049 * with failures we will restart.
1051 hostdata->selecting = NULL;
1052 /* RvC: have to preset this to indicate a new command is being performed */
1055 * REQUEST SENSE commands are issued without tagged
1056 * queueing, even on SCSI-II devices because the
1057 * contingent allegiance condition exists for the
1061 if (!NCR5380_select(instance, tmp)) {
1064 LIST(tmp, hostdata->issue_queue);
1065 tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1066 hostdata->issue_queue = tmp;
1068 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, "scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no);
1070 /* lock held here still */
1071 } /* if target/lun is not busy */
1074 } /* if (!hostdata->connected) */
1075 if (hostdata->selecting) {
1076 tmp = (Scsi_Cmnd *) hostdata->selecting;
1077 /* Selection will drop and retake the lock */
1078 if (!NCR5380_select(instance, tmp)) {
1081 /* RvC: device failed, so we wait a long time
1082 this is needed for Mustek scanners, that
1083 do not respond to commands immediately
1085 printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id);
1086 LIST(tmp, hostdata->issue_queue);
1087 tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
1088 hostdata->issue_queue = tmp;
1089 NCR5380_set_timer(hostdata, USLEEP_WAITLONG);
1091 } /* if hostdata->selecting */
1092 if (hostdata->connected
1094 && !hostdata->dmalen
1096 && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies))
1098 dprintk(NDEBUG_MAIN, "scsi%d : main() : performing information transfer\n", instance->host_no);
1099 NCR5380_information_transfer(instance);
1100 dprintk(NDEBUG_MAIN, "scsi%d : main() : done set false\n", instance->host_no);
1106 spin_unlock_irq(instance->host_lock);
1109 #ifndef DONT_USE_INTR
1112 * NCR5380_intr - generic NCR5380 irq handler
1113 * @irq: interrupt number
1114 * @dev_id: device info
1116 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1117 * from the disconnected queue, and restarting NCR5380_main()
1120 * Locks: takes the needed instance locks
1123 static irqreturn_t NCR5380_intr(int dummy, void *dev_id)
1125 NCR5380_local_declare();
1126 struct Scsi_Host *instance = dev_id;
1127 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1130 unsigned long flags;
1132 dprintk(NDEBUG_INTR, "scsi : NCR5380 irq %d triggered\n",
1137 spin_lock_irqsave(instance->host_lock, flags);
1138 /* Look for pending interrupts */
1139 NCR5380_setup(instance);
1140 basr = NCR5380_read(BUS_AND_STATUS_REG);
1141 /* XXX dispatch to appropriate routine if found and done=0 */
1142 if (basr & BASR_IRQ) {
1143 NCR5380_dprint(NDEBUG_INTR, instance);
1144 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1146 dprintk(NDEBUG_INTR, "scsi%d : SEL interrupt\n", instance->host_no);
1147 NCR5380_reselect(instance);
1148 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1149 } else if (basr & BASR_PARITY_ERROR) {
1150 dprintk(NDEBUG_INTR, "scsi%d : PARITY interrupt\n", instance->host_no);
1151 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1152 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1153 dprintk(NDEBUG_INTR, "scsi%d : RESET interrupt\n", instance->host_no);
1154 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1156 #if defined(REAL_DMA)
1158 * We should only get PHASE MISMATCH and EOP interrupts
1159 * if we have DMA enabled, so do a sanity check based on
1160 * the current setting of the MODE register.
1163 if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) {
1166 if (!hostdata->connected)
1167 panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno);
1169 transferred = (hostdata->dmalen - NCR5380_dma_residual(instance));
1170 hostdata->connected->SCp.this_residual -= transferred;
1171 hostdata->connected->SCp.ptr += transferred;
1172 hostdata->dmalen = 0;
1174 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1176 /* FIXME: we need to poll briefly then defer a workqueue task ! */
1177 NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ);
1179 NCR5380_write(MODE_REG, MR_BASE);
1180 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1183 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));
1184 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1188 spin_unlock_irqrestore(instance->host_lock, flags);
1190 schedule_delayed_work(&hostdata->coroutine, 0);
1198 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd)
1200 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1201 * including ARBITRATION, SELECTION, and initial message out for
1202 * IDENTIFY and queue messages.
1204 * Inputs : instance - instantiation of the 5380 driver on which this
1205 * target lives, cmd - SCSI command to execute.
1207 * Returns : -1 if selection could not execute for some reason,
1208 * 0 if selection succeeded or failed because the target
1212 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1213 * with registers as they should have been on entry - ie
1214 * SELECT_ENABLE will be set appropriately, the NCR5380
1215 * will cease to drive any SCSI bus signals.
1217 * If successful : I_T_L or I_T_L_Q nexus will be established,
1218 * instance->connected will be set to cmd.
1219 * SELECT interrupt will be disabled.
1221 * If failed (no target) : cmd->scsi_done() will be called, and the
1222 * cmd->result host byte set to DID_BAD_TARGET.
1224 * Locks: caller holds hostdata lock in IRQ mode
1227 static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd *cmd)
1229 NCR5380_local_declare();
1230 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1231 unsigned char tmp[3], phase;
1232 unsigned char *data;
1234 unsigned long timeout;
1235 unsigned char value;
1237 NCR5380_setup(instance);
1239 if (hostdata->selecting)
1242 hostdata->restart_select = 0;
1244 NCR5380_dprint(NDEBUG_ARBITRATION, instance);
1245 dprintk(NDEBUG_ARBITRATION, "scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id);
1248 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1249 * data bus during SELECTION.
1252 NCR5380_write(TARGET_COMMAND_REG, 0);
1255 * Start arbitration.
1258 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1259 NCR5380_write(MODE_REG, MR_ARBITRATE);
1262 /* We can be relaxed here, interrupts are on, we are
1263 in workqueue context, the birds are singing in the trees */
1264 spin_unlock_irq(instance->host_lock);
1265 err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ);
1266 spin_lock_irq(instance->host_lock);
1268 printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__);
1269 NCR5380_write(MODE_REG, MR_BASE);
1270 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1274 dprintk(NDEBUG_ARBITRATION, "scsi%d : arbitration complete\n", instance->host_no);
1277 * The arbitration delay is 2.2us, but this is a minimum and there is
1278 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1279 * the integral nature of udelay().
1285 /* Check for lost arbitration */
1286 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)) {
1287 NCR5380_write(MODE_REG, MR_BASE);
1288 dprintk(NDEBUG_ARBITRATION, "scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no);
1291 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL);
1293 if (!(hostdata->flags & FLAG_DTC3181E) &&
1294 /* RvC: DTC3181E has some trouble with this
1295 * so we simply removed it. Seems to work with
1296 * only Mustek scanner attached
1298 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
1299 NCR5380_write(MODE_REG, MR_BASE);
1300 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1301 dprintk(NDEBUG_ARBITRATION, "scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no);
1305 * Again, bus clear + bus settle time is 1.2us, however, this is
1306 * a minimum so we'll udelay ceil(1.2)
1311 dprintk(NDEBUG_ARBITRATION, "scsi%d : won arbitration\n", instance->host_no);
1314 * Now that we have won arbitration, start Selection process, asserting
1315 * the host and target ID's on the SCSI bus.
1318 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd))));
1321 * Raise ATN while SEL is true before BSY goes false from arbitration,
1322 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1323 * phase immediately after selection.
1326 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1327 NCR5380_write(MODE_REG, MR_BASE);
1330 * Reselect interrupts must be turned off prior to the dropping of BSY,
1331 * otherwise we will trigger an interrupt.
1333 NCR5380_write(SELECT_ENABLE_REG, 0);
1336 * The initiator shall then wait at least two deskew delays and release
1339 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1342 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1345 * Something weird happens when we cease to drive BSY - looks
1346 * like the board/chip is letting us do another read before the
1347 * appropriate propagation delay has expired, and we're confusing
1348 * a BSY signal from ourselves as the target's response to SELECTION.
1350 * A small delay (the 'C++' frontend breaks the pipeline with an
1351 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1352 * tighter 'C' code breaks and requires this) solves the problem -
1353 * the 1 us delay is arbitrary, and only used because this delay will
1354 * be the same on other platforms and since it works here, it should
1357 * wingel suggests that this could be due to failing to wait
1363 dprintk(NDEBUG_SELECTION, "scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd));
1366 * The SCSI specification calls for a 250 ms timeout for the actual
1370 timeout = jiffies + (250 * HZ / 1000);
1373 * XXX very interesting - we're seeing a bounce where the BSY we
1374 * asserted is being reflected / still asserted (propagation delay?)
1375 * and it's detecting as true. Sigh.
1378 hostdata->select_time = 0; /* we count the clock ticks at which we polled */
1379 hostdata->selecting = cmd;
1382 /* RvC: here we enter after a sleeping period, or immediately after
1384 we poll only once ech clock tick */
1385 value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO);
1387 if (!value && (hostdata->select_time < HZ/4)) {
1388 /* RvC: we still must wait for a device response */
1389 hostdata->select_time++; /* after 25 ticks the device has failed */
1390 NCR5380_set_timer(hostdata, 1);
1391 return 0; /* RvC: we return here with hostdata->selecting set,
1395 hostdata->selecting = NULL;/* clear this pointer, because we passed the
1397 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1398 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1399 NCR5380_reselect(instance);
1400 printk("scsi%d : reselection after won arbitration?\n", instance->host_no);
1401 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1405 * No less than two deskew delays after the initiator detects the
1406 * BSY signal is true, it shall release the SEL signal and may
1407 * change the DATA BUS. -wingel
1412 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1414 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1415 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1416 if (hostdata->targets_present & (1 << scmd_id(cmd))) {
1417 printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no);
1418 if (hostdata->restart_select)
1419 printk(KERN_DEBUG "\trestart select\n");
1420 NCR5380_dprint(NDEBUG_SELECTION, instance);
1421 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1424 cmd->result = DID_BAD_TARGET << 16;
1425 cmd->scsi_done(cmd);
1426 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1427 dprintk(NDEBUG_SELECTION, "scsi%d : target did not respond within 250ms\n", instance->host_no);
1428 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1431 hostdata->targets_present |= (1 << scmd_id(cmd));
1434 * Since we followed the SCSI spec, and raised ATN while SEL
1435 * was true but before BSY was false during selection, the information
1436 * transfer phase should be a MESSAGE OUT phase so that we can send the
1439 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1440 * message (2 bytes) with a tag ID that we increment with every command
1441 * until it wraps back to 0.
1443 * XXX - it turns out that there are some broken SCSI-II devices,
1444 * which claim to support tagged queuing but fail when more than
1445 * some number of commands are issued at once.
1448 /* Wait for start of REQ/ACK handshake */
1450 spin_unlock_irq(instance->host_lock);
1451 err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ);
1452 spin_lock_irq(instance->host_lock);
1455 printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__);
1456 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1460 dprintk(NDEBUG_SELECTION, "scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id);
1461 tmp[0] = IDENTIFY(((instance->irq == NO_IRQ) ? 0 : 1), cmd->device->lun);
1466 /* Send message(s) */
1468 phase = PHASE_MSGOUT;
1469 NCR5380_transfer_pio(instance, &phase, &len, &data);
1470 dprintk(NDEBUG_SELECTION, "scsi%d : nexus established.\n", instance->host_no);
1471 /* XXX need to handle errors here */
1472 hostdata->connected = cmd;
1473 hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF));
1475 initialize_SCp(cmd);
1479 /* Selection failed */
1486 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1487 * unsigned char *phase, int *count, unsigned char **data)
1489 * Purpose : transfers data in given phase using polled I/O
1491 * Inputs : instance - instance of driver, *phase - pointer to
1492 * what phase is expected, *count - pointer to number of
1493 * bytes to transfer, **data - pointer to data pointer.
1495 * Returns : -1 when different phase is entered without transferring
1496 * maximum number of bytes, 0 if all bytes or transferred or exit
1499 * Also, *phase, *count, *data are modified in place.
1501 * XXX Note : handling for bus free may be useful.
1505 * Note : this code is not as quick as it could be, however it
1506 * IS 100% reliable, and for the actual data transfer where speed
1507 * counts, we will always do a pseudo DMA or DMA transfer.
1510 static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1511 NCR5380_local_declare();
1512 unsigned char p = *phase, tmp;
1514 unsigned char *d = *data;
1516 * RvC: some administrative data to process polling time
1518 int break_allowed = 0;
1519 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1520 NCR5380_setup(instance);
1523 dprintk(NDEBUG_PIO, "scsi%d : pio write %d bytes\n", instance->host_no, c);
1525 dprintk(NDEBUG_PIO, "scsi%d : pio read %d bytes\n", instance->host_no, c);
1528 * The NCR5380 chip will only drive the SCSI bus when the
1529 * phase specified in the appropriate bits of the TARGET COMMAND
1530 * REGISTER match the STATUS REGISTER
1533 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1535 /* RvC: don't know if this is necessary, but other SCSI I/O is short
1536 * so breaks are not necessary there
1538 if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) {
1543 * Wait for assertion of REQ, after which the phase bits will be
1547 /* RvC: we simply poll once, after that we stop temporarily
1548 * and let the device buffer fill up
1549 * if breaking is not allowed, we keep polling as long as needed
1553 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed);
1554 if (!(tmp & SR_REQ)) {
1555 /* timeout condition */
1556 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
1560 dprintk(NDEBUG_HANDSHAKE, "scsi%d : REQ detected\n", instance->host_no);
1562 /* Check for phase mismatch */
1563 if ((tmp & PHASE_MASK) != p) {
1564 dprintk(NDEBUG_HANDSHAKE, "scsi%d : phase mismatch\n", instance->host_no);
1565 NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance);
1568 /* Do actual transfer from SCSI bus to / from memory */
1570 NCR5380_write(OUTPUT_DATA_REG, *d);
1572 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1577 * The SCSI standard suggests that in MSGOUT phase, the initiator
1578 * should drop ATN on the last byte of the message phase
1579 * after REQ has been asserted for the handshake but before
1580 * the initiator raises ACK.
1584 if (!((p & SR_MSG) && c > 1)) {
1585 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1586 NCR5380_dprint(NDEBUG_PIO, instance);
1587 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1589 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1590 NCR5380_dprint(NDEBUG_PIO, instance);
1591 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1594 NCR5380_dprint(NDEBUG_PIO, instance);
1595 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1598 /* FIXME - if this fails bus reset ?? */
1599 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ);
1600 dprintk(NDEBUG_HANDSHAKE, "scsi%d : req false, handshake complete\n", instance->host_no);
1603 * We have several special cases to consider during REQ/ACK handshaking :
1604 * 1. We were in MSGOUT phase, and we are on the last byte of the
1605 * message. ATN must be dropped as ACK is dropped.
1607 * 2. We are in a MSGIN phase, and we are on the last byte of the
1608 * message. We must exit with ACK asserted, so that the calling
1609 * code may raise ATN before dropping ACK to reject the message.
1611 * 3. ACK and ATN are clear and the target may proceed as normal.
1613 if (!(p == PHASE_MSGIN && c == 1)) {
1614 if (p == PHASE_MSGOUT && c > 1)
1615 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1617 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1621 dprintk(NDEBUG_PIO, "scsi%d : residual %d\n", instance->host_no, c);
1625 tmp = NCR5380_read(STATUS_REG);
1627 *phase = tmp & PHASE_MASK;
1629 *phase = PHASE_UNKNOWN;
1631 if (!c || (*phase == p))
1638 * do_reset - issue a reset command
1639 * @host: adapter to reset
1641 * Issue a reset sequence to the NCR5380 and try and get the bus
1642 * back into sane shape.
1644 * Locks: caller holds queue lock
1647 static void do_reset(struct Scsi_Host *host) {
1648 NCR5380_local_declare();
1649 NCR5380_setup(host);
1651 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
1652 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
1654 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1658 * Function : do_abort (Scsi_Host *host)
1660 * Purpose : abort the currently established nexus. Should only be
1661 * called from a routine which can drop into a
1663 * Returns : 0 on success, -1 on failure.
1665 * Locks: queue lock held by caller
1666 * FIXME: sort this out and get new_eh running
1669 static int do_abort(struct Scsi_Host *host) {
1670 NCR5380_local_declare();
1671 unsigned char *msgptr, phase, tmp;
1674 NCR5380_setup(host);
1677 /* Request message out phase */
1678 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1681 * Wait for the target to indicate a valid phase by asserting
1682 * REQ. Once this happens, we'll have either a MSGOUT phase
1683 * and can immediately send the ABORT message, or we'll have some
1684 * other phase and will have to source/sink data.
1686 * We really don't care what value was on the bus or what value
1687 * the target sees, so we just handshake.
1690 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ);
1695 tmp = (unsigned char)rc;
1697 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1699 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1700 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1701 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ);
1702 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1709 phase = PHASE_MSGOUT;
1710 NCR5380_transfer_pio(host, &phase, &len, &msgptr);
1713 * If we got here, and the command completed successfully,
1714 * we're about to go into bus free state.
1717 return len ? -1 : 0;
1720 #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL)
1722 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1723 * unsigned char *phase, int *count, unsigned char **data)
1725 * Purpose : transfers data in given phase using either real
1728 * Inputs : instance - instance of driver, *phase - pointer to
1729 * what phase is expected, *count - pointer to number of
1730 * bytes to transfer, **data - pointer to data pointer.
1732 * Returns : -1 when different phase is entered without transferring
1733 * maximum number of bytes, 0 if all bytes or transferred or exit
1736 * Also, *phase, *count, *data are modified in place.
1738 * Locks: io_request lock held by caller
1742 static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
1743 NCR5380_local_declare();
1744 register int c = *count;
1745 register unsigned char p = *phase;
1746 register unsigned char *d = *data;
1749 #if defined(REAL_DMA_POLL)
1751 unsigned char saved_data = 0, overrun = 0, residue;
1754 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1756 NCR5380_setup(instance);
1758 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1762 #if defined(REAL_DMA) || defined(REAL_DMA_POLL)
1763 #ifdef READ_OVERRUNS
1768 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);
1769 hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c);
1772 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1775 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
1776 #elif defined(REAL_DMA_POLL)
1777 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
1780 * Note : on my sample board, watch-dog timeouts occurred when interrupts
1781 * were not disabled for the duration of a single DMA transfer, from
1782 * before the setting of DMA mode to after transfer of the last byte.
1785 #if defined(PSEUDO_DMA) && defined(UNSAFE)
1786 spin_unlock_irq(instance->host_lock);
1788 /* KLL May need eop and parity in 53c400 */
1789 if (hostdata->flags & FLAG_NCR53C400)
1790 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE |
1791 MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR |
1792 MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
1794 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
1795 #endif /* def REAL_DMA */
1797 dprintk(NDEBUG_DMA, "scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG));
1800 * On the PAS16 at least I/O recovery delays are not needed here.
1801 * Everyone else seems to want them.
1805 io_recovery_delay(1);
1806 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1808 io_recovery_delay(1);
1809 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1810 io_recovery_delay(1);
1811 NCR5380_write(START_DMA_SEND_REG, 0);
1812 io_recovery_delay(1);
1815 #if defined(REAL_DMA_POLL)
1817 tmp = NCR5380_read(BUS_AND_STATUS_REG);
1818 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER)));
1821 At this point, either we've completed DMA, or we have a phase mismatch,
1822 or we've unexpectedly lost BUSY (which is a real error).
1824 For write DMAs, we want to wait until the last byte has been
1825 transferred out over the bus before we turn off DMA mode. Alas, there
1826 seems to be no terribly good way of doing this on a 5380 under all
1827 conditions. For non-scatter-gather operations, we can wait until REQ
1828 and ACK both go false, or until a phase mismatch occurs. Gather-writes
1829 are nastier, since the device will be expecting more data than we
1830 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
1831 could test LAST BIT SENT to assure transfer (I imagine this is precisely
1832 why this signal was added to the newer chips) but on the older 538[01]
1833 this signal does not exist. The workaround for this lack is a watchdog;
1834 we bail out of the wait-loop after a modest amount of wait-time if
1835 the usual exit conditions are not met. Not a terribly clean or
1836 correct solution :-%
1838 Reads are equally tricky due to a nasty characteristic of the NCR5380.
1839 If the chip is in DMA mode for an READ, it will respond to a target's
1840 REQ by latching the SCSI data into the INPUT DATA register and asserting
1841 ACK, even if it has _already_ been notified by the DMA controller that
1842 the current DMA transfer has completed! If the NCR5380 is then taken
1843 out of DMA mode, this already-acknowledged byte is lost.
1845 This is not a problem for "one DMA transfer per command" reads, because
1846 the situation will never arise... either all of the data is DMA'ed
1847 properly, or the target switches to MESSAGE IN phase to signal a
1848 disconnection (either operation bringing the DMA to a clean halt).
1849 However, in order to handle scatter-reads, we must work around the
1850 problem. The chosen fix is to DMA N-2 bytes, then check for the
1851 condition before taking the NCR5380 out of DMA mode. One or two extra
1852 bytes are transferred via PIO as necessary to fill out the original
1857 #ifdef READ_OVERRUNS
1859 if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) {
1860 saved_data = NCR5380_read(INPUT_DATA_REGISTER);
1866 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) {
1867 if (!(tmp & BASR_PHASE_MATCH))
1874 dprintk(NDEBUG_DMA, "scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG));
1876 NCR5380_write(MODE_REG, MR_BASE);
1877 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1879 residue = NCR5380_dma_residual(instance);
1883 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
1885 #ifdef READ_OVERRUNS
1886 if (*phase == p && (p & SR_IO) && residue == 0) {
1888 dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n");
1889 **data = saved_data;
1894 printk("No overrun??\n");
1897 dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%X\n", cnt, *data);
1898 NCR5380_transfer_pio(instance, phase, &cnt, data);
1899 *count -= toPIO - cnt;
1903 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));
1906 #elif defined(REAL_DMA)
1908 #else /* defined(REAL_DMA_POLL) */
1910 #ifdef DMA_WORKS_RIGHT
1911 foo = NCR5380_pread(instance, d, c);
1914 if (hostdata->flags & FLAG_NCR53C400) {
1917 if (!(foo = NCR5380_pread(instance, d, c - diff))) {
1919 * We can't disable DMA mode after successfully transferring
1920 * what we plan to be the last byte, since that would open up
1921 * a race condition where if the target asserted REQ before
1922 * we got the DMA mode reset, the NCR5380 would have latched
1923 * an additional byte into the INPUT DATA register and we'd
1926 * The workaround was to transfer one fewer bytes than we
1927 * intended to with the pseudo-DMA read function, wait for
1928 * the chip to latch the last byte, read it, and then disable
1931 * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
1932 * REQ is deasserted when ACK is asserted, and not reasserted
1933 * until ACK goes false. Since the NCR5380 won't lower ACK
1934 * until DACK is asserted, which won't happen unless we twiddle
1935 * the DMA port or we take the NCR5380 out of DMA mode, we
1936 * can guarantee that we won't handshake another extra
1940 if (!(hostdata->flags & FLAG_NCR53C400)) {
1941 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ));
1942 /* Wait for clean handshake */
1943 while (NCR5380_read(STATUS_REG) & SR_REQ);
1944 d[c - 1] = NCR5380_read(INPUT_DATA_REG);
1949 #ifdef DMA_WORKS_RIGHT
1950 foo = NCR5380_pwrite(instance, d, c);
1953 dprintk(NDEBUG_C400_PWRITE, "About to pwrite %d bytes\n", c);
1954 if (!(foo = NCR5380_pwrite(instance, d, c))) {
1956 * Wait for the last byte to be sent. If REQ is being asserted for
1957 * the byte we're interested, we'll ACK it and it will go false.
1959 if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) {
1961 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH));
1964 dprintk(NDEBUG_LAST_BYTE_SENT, "scsi%d : timed out on last byte\n", instance->host_no);
1966 if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) {
1967 hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT;
1968 if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) {
1969 hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT;
1970 dprintk(NDEBUG_LAST_BYTE_SENT, "scsi%d : last byte sent works\n", instance->host_no);
1974 dprintk(NDEBUG_C400_PWRITE, "Waiting for LASTBYTE\n");
1975 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT));
1976 dprintk(NDEBUG_C400_PWRITE, "Got LASTBYTE\n");
1981 NCR5380_write(MODE_REG, MR_BASE);
1982 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1984 if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) {
1985 dprintk(NDEBUG_C400_PWRITE, "53C400w: Checking for IRQ\n");
1986 if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) {
1987 dprintk(NDEBUG_C400_PWRITE, "53C400w: got it, reading reset interrupt reg\n");
1988 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1990 printk("53C400w: IRQ NOT THERE!\n");
1995 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
1996 #if defined(PSEUDO_DMA) && defined(UNSAFE)
1997 spin_lock_irq(instance->host_lock);
1998 #endif /* defined(REAL_DMA_POLL) */
2000 #endif /* def REAL_DMA */
2002 #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */
2005 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
2007 * Purpose : run through the various SCSI phases and do as the target
2008 * directs us to. Operates on the currently connected command,
2009 * instance->connected.
2011 * Inputs : instance, instance for which we are doing commands
2013 * Side effects : SCSI things happen, the disconnected queue will be
2014 * modified if a command disconnects, *instance->connected will
2017 * XXX Note : we need to watch for bus free or a reset condition here
2018 * to recover from an unexpected bus free condition.
2020 * Locks: io_request_lock held by caller in IRQ mode
2023 static void NCR5380_information_transfer(struct Scsi_Host *instance) {
2024 NCR5380_local_declare();
2025 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata;
2026 unsigned char msgout = NOP;
2029 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2032 unsigned char *data;
2033 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
2034 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
2035 /* RvC: we need to set the end of the polling time */
2036 unsigned long poll_time = jiffies + USLEEP_POLL;
2038 NCR5380_setup(instance);
2041 tmp = NCR5380_read(STATUS_REG);
2042 /* We only have a valid SCSI phase when REQ is asserted */
2044 phase = (tmp & PHASE_MASK);
2045 if (phase != old_phase) {
2047 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance);
2049 if (sink && (phase != PHASE_MSGOUT)) {
2050 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2052 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
2053 while (NCR5380_read(STATUS_REG) & SR_REQ);
2054 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2061 #if (NDEBUG & NDEBUG_NO_DATAOUT)
2062 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no);
2065 cmd->result = DID_ERROR << 16;
2066 cmd->scsi_done(cmd);
2070 * If there is no room left in the current buffer in the
2071 * scatter-gather list, move onto the next one.
2074 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2076 --cmd->SCp.buffers_residual;
2077 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2078 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
2079 dprintk(NDEBUG_INFORMATION, "scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual);
2082 * The preferred transfer method is going to be
2083 * PSEUDO-DMA for systems that are strictly PIO,
2084 * since we can let the hardware do the handshaking.
2086 * For this to work, we need to know the transfersize
2087 * ahead of time, since the pseudo-DMA code will sit
2088 * in an unconditional loop.
2091 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2093 * PSEUDO_DMA is defined here. If this is the g_NCR5380
2094 * driver then it will always be defined, so the
2095 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
2096 * NCR5380 case. I think this is a fairly clean solution.
2097 * We supplement these 2 if's with the flag.
2099 #ifdef NCR5380_dma_xfer_len
2100 if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) {
2102 transfersize = cmd->transfersize;
2104 #ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */
2105 if (transfersize > 512)
2107 #endif /* LIMIT_TRANSFERSIZE */
2109 if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) {
2110 /* Limit transfers to 32K, for xx400 & xx406
2111 * pseudoDMA that transfers in 128 bytes blocks. */
2112 if (transfersize > 32 * 1024)
2113 transfersize = 32 * 1024;
2116 if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) {
2118 * If the watchdog timer fires, all future accesses to this
2119 * device will use the polled-IO.
2121 scmd_printk(KERN_INFO, cmd,
2122 "switching to slow handshake\n");
2123 cmd->device->borken = 1;
2124 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2127 cmd->result = DID_ERROR << 16;
2128 cmd->scsi_done(cmd);
2129 /* XXX - need to source or sink data here, as appropriate */
2131 cmd->SCp.this_residual -= transfersize - len;
2133 #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */
2134 NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **)
2140 NCR5380_transfer_pio(instance, &phase, &len, &data);
2141 cmd->SCp.Message = tmp;
2145 * Linking lets us reduce the time required to get the
2146 * next command out to the device, hopefully this will
2147 * mean we don't waste another revolution due to the delays
2148 * required by ARBITRATION and another SELECTION.
2150 * In the current implementation proposal, low level drivers
2151 * merely have to start the next command, pointed to by
2152 * next_link, done() is called as with unlinked commands.
2155 case LINKED_CMD_COMPLETE:
2156 case LINKED_FLG_CMD_COMPLETE:
2157 /* Accept message by clearing ACK */
2158 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2159 dprintk(NDEBUG_LINKED, "scsi%d : target %d lun %llu linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun);
2161 * Sanity check : A linked command should only terminate with
2162 * one of these messages if there are more linked commands
2165 if (!cmd->next_link) {
2166 printk("scsi%d : target %d lun %llu linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun);
2171 initialize_SCp(cmd->next_link);
2172 /* The next command is still part of this process */
2173 cmd->next_link->tag = cmd->tag;
2174 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2175 dprintk(NDEBUG_LINKED, "scsi%d : target %d lun %llu linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun);
2176 cmd->scsi_done(cmd);
2177 cmd = hostdata->connected;
2179 #endif /* def LINKED */
2181 case COMMAND_COMPLETE:
2182 /* Accept message by clearing ACK */
2184 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2185 hostdata->connected = NULL;
2186 dprintk(NDEBUG_QUEUES, "scsi%d : command for target %d, lun %llu completed\n", instance->host_no, cmd->device->id, cmd->device->lun);
2187 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xFF));
2190 * I'm not sure what the correct thing to do here is :
2192 * If the command that just executed is NOT a request
2193 * sense, the obvious thing to do is to set the result
2194 * code to the values of the stored parameters.
2196 * If it was a REQUEST SENSE command, we need some way
2197 * to differentiate between the failure code of the original
2198 * and the failure code of the REQUEST sense - the obvious
2199 * case is success, where we fall through and leave the result
2202 * The non-obvious place is where the REQUEST SENSE failed
2205 if (cmd->cmnd[0] != REQUEST_SENSE)
2206 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2207 else if (status_byte(cmd->SCp.Status) != GOOD)
2208 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2210 if ((cmd->cmnd[0] == REQUEST_SENSE) &&
2211 hostdata->ses.cmd_len) {
2212 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
2213 hostdata->ses.cmd_len = 0 ;
2216 if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2217 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
2219 dprintk(NDEBUG_AUTOSENSE, "scsi%d : performing request sense\n", instance->host_no);
2221 LIST(cmd, hostdata->issue_queue);
2222 cmd->host_scribble = (unsigned char *)
2223 hostdata->issue_queue;
2224 hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2225 dprintk(NDEBUG_QUEUES, "scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no);
2227 cmd->scsi_done(cmd);
2230 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2232 * Restore phase bits to 0 so an interrupted selection,
2233 * arbitration can resume.
2235 NCR5380_write(TARGET_COMMAND_REG, 0);
2237 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2240 case MESSAGE_REJECT:
2241 /* Accept message by clearing ACK */
2242 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2243 switch (hostdata->last_message) {
2244 case HEAD_OF_QUEUE_TAG:
2245 case ORDERED_QUEUE_TAG:
2246 case SIMPLE_QUEUE_TAG:
2247 cmd->device->simple_tags = 0;
2248 hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF));
2254 /* Accept message by clearing ACK */
2255 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2256 cmd->device->disconnect = 1;
2257 LIST(cmd, hostdata->disconnected_queue);
2258 cmd->host_scribble = (unsigned char *)
2259 hostdata->disconnected_queue;
2260 hostdata->connected = NULL;
2261 hostdata->disconnected_queue = cmd;
2262 dprintk(NDEBUG_QUEUES, "scsi%d : command for target %d lun %llu was moved from connected to" " the disconnected_queue\n", instance->host_no, cmd->device->id, cmd->device->lun);
2264 * Restore phase bits to 0 so an interrupted selection,
2265 * arbitration can resume.
2267 NCR5380_write(TARGET_COMMAND_REG, 0);
2269 /* Enable reselect interrupts */
2270 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2271 /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/
2272 /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */
2273 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2278 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2279 * operation, in violation of the SCSI spec so we can safely
2280 * ignore SAVE/RESTORE pointers calls.
2282 * Unfortunately, some disks violate the SCSI spec and
2283 * don't issue the required SAVE_POINTERS message before
2284 * disconnecting, and we have to break spec to remain
2288 case RESTORE_POINTERS:
2289 /* Accept message by clearing ACK */
2290 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2292 case EXTENDED_MESSAGE:
2294 * Extended messages are sent in the following format :
2296 * 0 EXTENDED_MESSAGE == 1
2297 * 1 length (includes one byte for code, doesn't
2298 * include first two bytes)
2300 * 3..length+1 arguments
2302 * Start the extended message buffer with the EXTENDED_MESSAGE
2303 * byte, since spi_print_msg() wants the whole thing.
2305 extended_msg[0] = EXTENDED_MESSAGE;
2306 /* Accept first byte by clearing ACK */
2307 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2308 dprintk(NDEBUG_EXTENDED, "scsi%d : receiving extended message\n", instance->host_no);
2311 data = extended_msg + 1;
2312 phase = PHASE_MSGIN;
2313 NCR5380_transfer_pio(instance, &phase, &len, &data);
2315 dprintk(NDEBUG_EXTENDED, "scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2]);
2317 if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) {
2318 /* Accept third byte by clearing ACK */
2319 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2320 len = extended_msg[1] - 1;
2321 data = extended_msg + 3;
2322 phase = PHASE_MSGIN;
2324 NCR5380_transfer_pio(instance, &phase, &len, &data);
2325 dprintk(NDEBUG_EXTENDED, "scsi%d : message received, residual %d\n", instance->host_no, len);
2327 switch (extended_msg[2]) {
2330 case EXTENDED_MODIFY_DATA_POINTER:
2331 case EXTENDED_EXTENDED_IDENTIFY:
2335 printk("scsi%d: error receiving extended message\n", instance->host_no);
2338 printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]);
2341 /* Fall through to reject message */
2344 * If we get something weird that we aren't expecting,
2349 printk("scsi%d: rejecting message ", instance->host_no);
2350 spi_print_msg(extended_msg);
2352 } else if (tmp != EXTENDED_MESSAGE)
2353 scmd_printk(KERN_INFO, cmd,
2354 "rejecting unknown message %02x\n",tmp);
2356 scmd_printk(KERN_INFO, cmd,
2357 "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]);
2359 msgout = MESSAGE_REJECT;
2360 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2362 } /* switch (tmp) */
2367 hostdata->last_message = msgout;
2368 NCR5380_transfer_pio(instance, &phase, &len, &data);
2369 if (msgout == ABORT) {
2370 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xFF));
2371 hostdata->connected = NULL;
2372 cmd->result = DID_ERROR << 16;
2373 cmd->scsi_done(cmd);
2374 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2383 * XXX for performance reasons, on machines with a
2384 * PSEUDO-DMA architecture we should probably
2385 * use the dma transfer function.
2387 NCR5380_transfer_pio(instance, &phase, &len, &data);
2388 if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) {
2389 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
2390 dprintk(NDEBUG_USLEEP, "scsi%d : issued command, sleeping until %lu\n", instance->host_no, hostdata->time_expires);
2397 NCR5380_transfer_pio(instance, &phase, &len, &data);
2398 cmd->SCp.Status = tmp;
2401 printk("scsi%d : unknown phase\n", instance->host_no);
2402 NCR5380_dprint(NDEBUG_ANY, instance);
2403 } /* switch(phase) */
2404 } /* if (tmp * SR_REQ) */
2406 /* RvC: go to sleep if polling time expired
2408 if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) {
2409 NCR5380_set_timer(hostdata, USLEEP_SLEEP);
2410 dprintk(NDEBUG_USLEEP, "scsi%d : poll timed out, sleeping until %lu\n", instance->host_no, hostdata->time_expires);
2418 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2420 * Purpose : does reselection, initializing the instance->connected
2421 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2422 * nexus has been reestablished,
2424 * Inputs : instance - this instance of the NCR5380.
2426 * Locks: io_request_lock held by caller if IRQ driven
2429 static void NCR5380_reselect(struct Scsi_Host *instance) {
2430 NCR5380_local_declare();
2431 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
2433 unsigned char target_mask;
2434 unsigned char lun, phase;
2436 unsigned char msg[3];
2437 unsigned char *data;
2438 Scsi_Cmnd *tmp = NULL, *prev;
2440 NCR5380_setup(instance);
2443 * Disable arbitration, etc. since the host adapter obviously
2444 * lost, and tell an interrupted NCR5380_select() to restart.
2447 NCR5380_write(MODE_REG, MR_BASE);
2448 hostdata->restart_select = 1;
2450 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2451 dprintk(NDEBUG_SELECTION, "scsi%d : reselect\n", instance->host_no);
2454 * At this point, we have detected that our SCSI ID is on the bus,
2455 * SEL is true and BSY was false for at least one bus settle delay
2458 * We must assert BSY ourselves, until the target drops the SEL
2462 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2464 /* FIXME: timeout too long, must fail to workqueue */
2465 if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0)
2468 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2471 * Wait for target to go into MSGIN.
2472 * FIXME: timeout needed and fail to work queeu
2475 if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ))
2480 phase = PHASE_MSGIN;
2481 NCR5380_transfer_pio(instance, &phase, &len, &data);
2483 if (!(msg[0] & 0x80)) {
2484 printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no);
2488 /* Accept message by clearing ACK */
2489 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2490 lun = (msg[0] & 0x07);
2493 * We need to add code for SCSI-II to track which devices have
2494 * I_T_L_Q nexuses established, and which have simple I_T_L
2495 * nexuses so we can chose to do additional data transfer.
2499 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2500 * just reestablished, and remove it from the disconnected queue.
2504 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
2505 if ((target_mask == (1 << tmp->device->id)) && (lun == (u8)tmp->device->lun)
2508 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
2509 prev->host_scribble = tmp->host_scribble;
2511 REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble);
2512 hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble;
2514 tmp->host_scribble = NULL;
2518 printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun);
2520 * Since we have an established nexus that we can't do anything with,
2530 hostdata->connected = tmp;
2531 dprintk(NDEBUG_RESELECTION, "scsi%d : nexus established, target = %d, lun = %llu, tag = %d\n", instance->host_no, tmp->device->id, tmp->device->lun, tmp->tag);
2536 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
2538 * Purpose : called by interrupt handler when DMA finishes or a phase
2539 * mismatch occurs (which would finish the DMA transfer).
2541 * Inputs : instance - this instance of the NCR5380.
2543 * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L
2544 * nexus has been reestablished, on failure NULL is returned.
2548 static void NCR5380_dma_complete(NCR5380_instance * instance) {
2549 NCR5380_local_declare();
2550 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
2552 NCR5380_setup(instance);
2555 * XXX this might not be right.
2557 * Wait for final byte to transfer, ie wait for ACK to go false.
2559 * We should use the Last Byte Sent bit, unfortunately this is
2560 * not available on the 5380/5381 (only the various CMOS chips)
2562 * FIXME: timeout, and need to handle long timeout/irq case
2565 NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ);
2567 NCR5380_write(MODE_REG, MR_BASE);
2568 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2571 * The only places we should see a phase mismatch and have to send
2572 * data from the same set of pointers will be the data transfer
2573 * phases. So, residual, requested length are only important here.
2576 if (!(hostdata->connected->SCp.phase & SR_CD)) {
2577 transferred = instance->dmalen - NCR5380_dma_residual();
2578 hostdata->connected->SCp.this_residual -= transferred;
2579 hostdata->connected->SCp.ptr += transferred;
2582 #endif /* def REAL_DMA */
2585 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2587 * Purpose : abort a command
2589 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2590 * host byte of the result field to, if zero DID_ABORTED is
2593 * Returns : SUCCESS - success, FAILED on failure.
2595 * XXX - there is no way to abort the command that is currently
2596 * connected, you have to wait for it to complete. If this is
2597 * a problem, we could implement longjmp() / setjmp(), setjmp()
2598 * called where the loop started in NCR5380_main().
2600 * Locks: host lock taken by caller
2603 static int NCR5380_abort(Scsi_Cmnd * cmd) {
2604 NCR5380_local_declare();
2605 struct Scsi_Host *instance = cmd->device->host;
2606 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
2607 Scsi_Cmnd *tmp, **prev;
2609 scmd_printk(KERN_WARNING, cmd, "aborting command\n");
2611 NCR5380_print_status(instance);
2613 NCR5380_setup(instance);
2615 dprintk(NDEBUG_ABORT, "scsi%d : abort called\n", instance->host_no);
2616 dprintk(NDEBUG_ABORT, " basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG));
2620 * Case 1 : If the command is the currently executing command,
2621 * we'll set the aborted flag and return control so that
2622 * information transfer routine can exit cleanly.
2625 if (hostdata->connected == cmd) {
2626 dprintk(NDEBUG_ABORT, "scsi%d : aborting connected command\n", instance->host_no);
2627 hostdata->aborted = 1;
2629 * We should perform BSY checking, and make sure we haven't slipped
2633 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN);
2635 * Since we can't change phases until we've completed the current
2636 * handshake, we have to source or sink a byte of data if the current
2637 * phase is not MSGOUT.
2641 * Return control to the executing NCR drive so we can clear the
2642 * aborted flag and get back into our main loop.
2650 * Case 2 : If the command hasn't been issued yet, we simply remove it
2651 * from the issue queue.
2654 dprintk(NDEBUG_ABORT, "scsi%d : abort going into loop.\n", instance->host_no);
2655 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)
2657 REMOVE(5, *prev, tmp, tmp->host_scribble);
2658 (*prev) = (Scsi_Cmnd *) tmp->host_scribble;
2659 tmp->host_scribble = NULL;
2660 tmp->result = DID_ABORT << 16;
2661 dprintk(NDEBUG_ABORT, "scsi%d : abort removed command from issue queue.\n", instance->host_no);
2662 tmp->scsi_done(tmp);
2665 #if (NDEBUG & NDEBUG_ABORT)
2667 else if (prev == tmp)
2668 printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no);
2672 * Case 3 : If any commands are connected, we're going to fail the abort
2673 * and let the high level SCSI driver retry at a later time or
2676 * Timeouts, and therefore aborted commands, will be highly unlikely
2677 * and handling them cleanly in this situation would make the common
2678 * case of noresets less efficient, and would pollute our code. So,
2682 if (hostdata->connected) {
2683 dprintk(NDEBUG_ABORT, "scsi%d : abort failed, command connected.\n", instance->host_no);
2687 * Case 4: If the command is currently disconnected from the bus, and
2688 * there are no connected commands, we reconnect the I_T_L or
2689 * I_T_L_Q nexus associated with it, go into message out, and send
2692 * This case is especially ugly. In order to reestablish the nexus, we
2693 * need to call NCR5380_select(). The easiest way to implement this
2694 * function was to abort if the bus was busy, and let the interrupt
2695 * handler triggered on the SEL for reselect take care of lost arbitrations
2696 * where necessary, meaning interrupts need to be enabled.
2698 * When interrupts are enabled, the queues may change - so we
2699 * can't remove it from the disconnected queue before selecting it
2700 * because that could cause a failure in hashing the nexus if that
2701 * device reselected.
2703 * Since the queues may change, we can't use the pointers from when we
2706 * So, we must first locate the command, and if NCR5380_select()
2707 * succeeds, then issue the abort, relocate the command and remove
2708 * it from the disconnected queue.
2711 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble)
2713 dprintk(NDEBUG_ABORT, "scsi%d : aborting disconnected command.\n", instance->host_no);
2715 if (NCR5380_select(instance, cmd))
2717 dprintk(NDEBUG_ABORT, "scsi%d : nexus reestablished.\n", instance->host_no);
2721 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)
2723 REMOVE(5, *prev, tmp, tmp->host_scribble);
2724 *prev = (Scsi_Cmnd *) tmp->host_scribble;
2725 tmp->host_scribble = NULL;
2726 tmp->result = DID_ABORT << 16;
2727 tmp->scsi_done(tmp);
2732 * Case 5 : If we reached this point, the command was not found in any of
2735 * We probably reached this point because of an unlikely race condition
2736 * between the command completing successfully and the abortion code,
2737 * so we won't panic, but we will notify the user in case something really
2740 printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n"
2741 " before abortion\n", instance->host_no);
2747 * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd)
2749 * Purpose : reset the SCSI bus.
2753 * Locks: host lock taken by caller
2756 static int NCR5380_bus_reset(Scsi_Cmnd * cmd)
2758 struct Scsi_Host *instance = cmd->device->host;
2760 NCR5380_local_declare();
2761 NCR5380_setup(instance);
2762 NCR5380_print_status(instance);
2764 spin_lock_irq(instance->host_lock);
2766 spin_unlock_irq(instance->host_lock);