2 #define NDEBUG (NDEBUG_RESTART_SELECT | NDEBUG_ABORT)
5 * NCR 5380 generic driver routines. These should make it *trivial*
6 * to implement 5380 SCSI drivers under Linux with a non-trantor
9 * Note that these routines also work with NR53c400 family chips.
11 * Copyright 1993, Drew Eckhardt
13 * (Unix and Linux consulting and custom programming)
17 * DISTRIBUTION RELEASE 6.
19 * For more information, please consult
22 * SCSI Protocol Controller
25 * NCR Microelectronics
26 * 1635 Aeroplaza Drive
27 * Colorado Springs, CO 80916
35 * Revision 1.10 1998/9/2 Alan Cox
37 * Fixed up the timer lockups reported so far. Things still suck. Looking
38 * forward to 2.3 and per device request queues. Then it'll be possible to
39 * SMP thread this beast and improve life no end.
41 * Revision 1.9 1997/7/27 Ronald van Cuijlenborg
42 * (ronald.van.cuijlenborg@tip.nl or nutty@dds.nl)
43 * (hopefully) fixed and enhanced USLEEP
44 * added support for DTC3181E card (for Mustek scanner)
47 * Revision 1.8 Ingmar Baumgart
48 * (ingmar@gonzo.schwaben.de)
49 * added support for NCR53C400a card
52 * Revision 1.7 1996/3/2 Ray Van Tassle (rayvt@comm.mot.com)
54 * added support needed for DTC 3180/3280
55 * fixed a couple of bugs
58 * Revision 1.5 1994/01/19 09:14:57 drew
59 * Fixed udelay() hack that was being used on DATAOUT phases
60 * instead of a proper wait for the final handshake.
62 * Revision 1.4 1994/01/19 06:44:25 drew
63 * *** empty log message ***
65 * Revision 1.3 1994/01/19 05:24:40 drew
66 * Added support for TCR LAST_BYTE_SENT bit.
68 * Revision 1.2 1994/01/15 06:14:11 drew
69 * REAL DMA support, bug fixes.
71 * Revision 1.1 1994/01/15 06:00:54 drew
77 * Further development / testing that should be done :
78 * 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete
79 * code so that everything does the same thing that's done at the
80 * end of a pseudo-DMA read operation.
82 * 2. Fix REAL_DMA (interrupt driven, polled works fine) -
83 * basically, transfer size needs to be reduced by one
84 * and the last byte read as is done with PSEUDO_DMA.
88 * 4. Test SCSI-II tagged queueing (I have no devices which support
91 * 5. Test linked command handling code after Eric is ready with
92 * the high level code.
95 #if (NDEBUG & NDEBUG_LISTS)
96 #define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); }
97 #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); }
100 #define REMOVE(w,x,y,z)
110 #define READ_OVERRUNS
117 * The other Linux SCSI drivers were written when Linux was Intel PC-only,
118 * and specifically for each board rather than each chip. This makes their
119 * adaptation to platforms like the Mac (Some of which use NCR5380's)
120 * more difficult than it has to be.
122 * Also, many of the SCSI drivers were written before the command queuing
123 * routines were implemented, meaning their implementations of queued
124 * commands were hacked on rather than designed in from the start.
126 * When I designed the Linux SCSI drivers I figured that
127 * while having two different SCSI boards in a system might be useful
128 * for debugging things, two of the same type wouldn't be used.
129 * Well, I was wrong and a number of users have mailed me about running
130 * multiple high-performance SCSI boards in a server.
132 * Finally, when I get questions from users, I have no idea what
133 * revision of my driver they are running.
135 * This driver attempts to address these problems :
136 * This is a generic 5380 driver. To use it on a different platform,
137 * one simply writes appropriate system specific macros (ie, data
138 * transfer - some PC's will use the I/O bus, 68K's must use
139 * memory mapped) and drops this file in their 'C' wrapper.
141 * As far as command queueing, two queues are maintained for
142 * each 5380 in the system - commands that haven't been issued yet,
143 * and commands that are currently executing. This means that an
144 * unlimited number of commands may be queued, letting
145 * more commands propagate from the higher driver levels giving higher
146 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
147 * allowing multiple commands to propagate all the way to a SCSI-II device
148 * while a command is already executing.
150 * To solve the multiple-boards-in-the-same-system problem,
151 * there is a separate instance structure for each instance
152 * of a 5380 in the system. So, multiple NCR5380 drivers will
153 * be able to coexist with appropriate changes to the high level
156 * A NCR5380_PUBLIC_REVISION macro is provided, with the release
157 * number (updated for each public release) printed by the
158 * NCR5380_print_options command, which should be called from the
159 * wrapper detect function, so that I know what release of the driver
162 * Issues specific to the NCR5380 :
164 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
165 * piece of hardware that requires you to sit in a loop polling for
166 * the REQ signal as long as you are connected. Some devices are
167 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
168 * while doing long seek operations.
170 * The workaround for this is to keep track of devices that have
171 * disconnected. If the device hasn't disconnected, for commands that
172 * should disconnect, we do something like
174 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
176 * Some tweaking of N and M needs to be done. An algorithm based
177 * on "time to data" would give the best results as long as short time
178 * to datas (ie, on the same track) were considered, however these
179 * broken devices are the exception rather than the rule and I'd rather
180 * spend my time optimizing for the normal case.
184 * At the heart of the design is a coroutine, NCR5380_main,
185 * which is started when not running by the interrupt handler,
186 * timer, and queue command function. It attempts to establish
187 * I_T_L or I_T_L_Q nexuses by removing the commands from the
188 * issue queue and calling NCR5380_select() if a nexus
189 * is not established.
191 * Once a nexus is established, the NCR5380_information_transfer()
192 * phase goes through the various phases as instructed by the target.
193 * if the target goes into MSG IN and sends a DISCONNECT message,
194 * the command structure is placed into the per instance disconnected
195 * queue, and NCR5380_main tries to find more work. If USLEEP
196 * was defined, and the target is idle for too long, the system
199 * If a command has disconnected, eventually an interrupt will trigger,
200 * calling NCR5380_intr() which will in turn call NCR5380_reselect
201 * to reestablish a nexus. This will run main if necessary.
203 * On command termination, the done function will be called as
206 * SCSI pointers are maintained in the SCp field of SCSI command
207 * structures, being initialized after the command is connected
208 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
209 * Note that in violation of the standard, an implicit SAVE POINTERS operation
210 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
215 * This file a skeleton Linux SCSI driver for the NCR 5380 series
216 * of chips. To use it, you write an architecture specific functions
217 * and macros and include this file in your driver.
219 * These macros control options :
220 * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be
223 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
224 * for commands that return with a CHECK CONDITION status.
226 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
229 * DONT_USE_INTR - if defined, never use interrupts, even if we probe or
230 * override-configure an IRQ.
232 * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512
233 * bytes at a time. Since interrupts are disabled by default during
234 * these transfers, we might need this to give reasonable interrupt
235 * service time if the transfer size gets too large.
237 * LINKED - if defined, linked commands are supported.
239 * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases.
241 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
243 * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't
244 * rely on phase mismatch and EOP interrupts to determine end
247 * SCSI2 - if defined, SCSI-2 tagged queuing is used where possible
249 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You
250 * only really want to use this if you're having a problem with
251 * dropped characters during high speed communications, and even
252 * then, you're going to be better off twiddling with transfersize
253 * in the high level code.
255 * USLEEP - if defined, on devices that aren't disconnecting from the
256 * bus, we will go to sleep so that the CPU can get real work done
257 * when we run a command that won't complete immediately.
259 * Defaults for these will be provided if USLEEP is defined, although
260 * the user may want to adjust these to allocate CPU resources to
261 * the SCSI driver or "real" code.
263 * USLEEP_SLEEP - amount of time, in jiffies, to sleep
265 * USLEEP_POLL - amount of time, in jiffies, to poll
267 * These macros MUST be defined :
268 * NCR5380_local_declare() - declare any local variables needed for your
271 * NCR5380_setup(instance) - initialize any local variables needed from a given
272 * instance of the host adapter for NCR5380_{read,write,pread,pwrite}
274 * NCR5380_read(register) - read from the specified register
276 * NCR5380_write(register, value) - write to the specific register
278 * NCR5380_implementation_fields - additional fields needed for this
279 * specific implementation of the NCR5380
281 * Either real DMA *or* pseudo DMA may be implemented
283 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
284 * Note that the DMA setup functions should return the number of bytes
285 * that they were able to program the controller for.
287 * Also note that generic i386/PC versions of these macros are
288 * available as NCR5380_i386_dma_write_setup,
289 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
291 * NCR5380_dma_write_setup(instance, src, count) - initialize
292 * NCR5380_dma_read_setup(instance, dst, count) - initialize
293 * NCR5380_dma_residual(instance); - residual count
296 * NCR5380_pwrite(instance, src, count)
297 * NCR5380_pread(instance, dst, count);
299 * If nothing specific to this implementation needs doing (ie, with external
300 * hardware), you must also define
302 * NCR5380_queue_command
307 * to be the global entry points into the specific driver, ie
308 * #define NCR5380_queue_command t128_queue_command.
310 * If this is not done, the routines will be defined as static functions
311 * with the NCR5380* names and the user must provide a globally
312 * accessible wrapper function.
314 * The generic driver is initialized by calling NCR5380_init(instance),
315 * after setting the appropriate host specific fields and ID. If the
316 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
317 * possible) function may be used. Before the specific driver initialization
318 * code finishes, NCR5380_print_options should be called.
321 static int do_abort(struct Scsi_Host
*host
);
322 static void do_reset(struct Scsi_Host
*host
);
323 static struct Scsi_Host
*first_instance
= NULL
;
324 static Scsi_Host_Template
*the_template
= NULL
;
327 struct timer_list usleep_timer
;
331 * Function : void initialize_SCp(Scsi_Cmnd *cmd)
333 * Purpose : initialize the saved data pointers for cmd to point to the
334 * start of the buffer.
336 * Inputs : cmd - Scsi_Cmnd structure to have pointers reset.
339 static __inline__
void initialize_SCp(Scsi_Cmnd
* cmd
)
342 * Initialize the Scsi Pointer field so that all of the commands in the
343 * various queues are valid.
347 cmd
->SCp
.buffer
= (struct scatterlist
*) cmd
->buffer
;
348 cmd
->SCp
.buffers_residual
= cmd
->use_sg
- 1;
349 cmd
->SCp
.ptr
= (char *) cmd
->SCp
.buffer
->address
;
350 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
352 cmd
->SCp
.buffer
= NULL
;
353 cmd
->SCp
.buffers_residual
= 0;
354 cmd
->SCp
.ptr
= (char *) cmd
->request_buffer
;
355 cmd
->SCp
.this_residual
= cmd
->request_bufflen
;
359 #include <linux/delay.h>
399 ICR_ASSERT_RST
, "ASSERT RST"
401 ICR_ASSERT_ACK
, "ASSERT ACK"
404 ICR_ASSERT_BSY
, "ASSERT BSY"
406 ICR_ASSERT_SEL
, "ASSERT SEL"
409 ICR_ASSERT_ATN
, "ASSERT ATN"
411 ICR_ASSERT_DATA
, "ASSERT DATA"
419 MR_BLOCK_DMA_MODE
, "MODE BLOCK DMA"
421 MR_TARGET
, "MODE TARGET"
424 MR_ENABLE_PAR_CHECK
, "MODE PARITY CHECK"
429 MR_MONITOR_BSY
, "MODE MONITOR BSY"
432 MR_DMA_MODE
, "MODE DMA"
434 MR_ARBITRATE
, "MODE ARBITRATION"
442 * Function : void NCR5380_print(struct Scsi_Host *instance)
444 * Purpose : print the SCSI bus signals for debugging purposes
446 * Input : instance - which NCR5380
449 static void NCR5380_print(struct Scsi_Host
*instance
)
451 NCR5380_local_declare();
453 unsigned char status
, data
, basr
, mr
, icr
, i
;
454 NCR5380_setup(instance
);
457 data
= NCR5380_read(CURRENT_SCSI_DATA_REG
);
458 status
= NCR5380_read(STATUS_REG
);
459 mr
= NCR5380_read(MODE_REG
);
460 icr
= NCR5380_read(INITIATOR_COMMAND_REG
);
461 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
462 restore_flags(flags
);
463 printk("STATUS_REG: %02x ", status
);
464 for (i
= 0; signals
[i
].mask
; ++i
)
465 if (status
& signals
[i
].mask
)
466 printk(",%s", signals
[i
].name
);
467 printk("\nBASR: %02x ", basr
);
468 for (i
= 0; basrs
[i
].mask
; ++i
)
469 if (basr
& basrs
[i
].mask
)
470 printk(",%s", basrs
[i
].name
);
471 printk("\nICR: %02x ", icr
);
472 for (i
= 0; icrs
[i
].mask
; ++i
)
473 if (icr
& icrs
[i
].mask
)
474 printk(",%s", icrs
[i
].name
);
475 printk("\nMODE: %02x ", mr
);
476 for (i
= 0; mrs
[i
].mask
; ++i
)
477 if (mr
& mrs
[i
].mask
)
478 printk(",%s", mrs
[i
].name
);
488 PHASE_DATAOUT
, "DATAOUT"
490 PHASE_DATAIN
, "DATAIN"
492 PHASE_CMDOUT
, "CMDOUT"
495 PHASE_STATIN
, "STATIN"
497 PHASE_MSGOUT
, "MSGOUT"
502 PHASE_UNKNOWN
, "UNKNOWN"
507 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
509 * Purpose : print the current SCSI phase for debugging purposes
511 * Input : instance - which NCR5380
514 static void NCR5380_print_phase(struct Scsi_Host
*instance
)
516 NCR5380_local_declare();
517 unsigned char status
;
519 NCR5380_setup(instance
);
521 status
= NCR5380_read(STATUS_REG
);
522 if (!(status
& SR_REQ
))
523 printk("scsi%d : REQ not asserted, phase unknown.\n",
526 for (i
= 0; (phases
[i
].value
!= PHASE_UNKNOWN
) &&
527 (phases
[i
].value
!= (status
& PHASE_MASK
)); ++i
);
528 printk("scsi%d : phase %s\n", instance
->host_no
, phases
[i
].name
);
534 * We need to have our coroutine active given these constraints :
535 * 1. The mutex flag, main_running, can only be set when the main
536 * routine can actually process data, otherwise SCSI commands
537 * will never get issued.
539 * 2. NCR5380_main() shouldn't be called before it has exited, because
540 * other drivers have had kernel stack overflows in similar
543 * 3. We don't want to inline NCR5380_main() because of space concerns,
544 * even though it is only called in two places.
546 * So, the solution is to set the mutex in an inline wrapper for the
547 * main coroutine, and have the main coroutine exit with interrupts
548 * disabled after the final search through the queues so that no race
549 * conditions are possible.
552 static volatile int main_running
= 0;
555 * Function : run_main(void)
557 * Purpose : insure that the coroutine is running and will process our
558 * request. main_running is checked/set here (in an inline function)
559 * rather than in NCR5380_main itself to reduce the chances of stack
564 static __inline__
void run_main(void)
573 restore_flags(flags
);
579 * These need tweaking, and would probably work best as per-device
580 * flags initialized differently for disk, tape, cd, etc devices.
581 * People with broken devices are free to experiment as to what gives
582 * the best results for them.
584 * USLEEP_SLEEP should be a minimum seek time.
586 * USLEEP_POLL should be a maximum rotational latency.
589 /* 20 ms (reasonable hard disk speed) */
590 #define USLEEP_SLEEP (20*HZ/1000)
592 /* 300 RPM (floppy speed) */
594 #define USLEEP_POLL (200*HZ/1000)
596 #ifndef USLEEP_WAITLONG
597 /* RvC: (reasonable time to wait on select error) */
598 #define USLEEP_WAITLONG USLEEP_SLEEP
601 static struct Scsi_Host
*expires_first
= NULL
;
604 * Function : int should_disconnect (unsigned char cmd)
606 * Purpose : decide weather a command would normally disconnect or
607 * not, since if it won't disconnect we should go to sleep.
609 * Input : cmd - opcode of SCSI command
611 * Returns : DISCONNECT_LONG if we should disconnect for a really long
612 * time (ie always, sleep, look for REQ active, sleep),
613 * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal
614 * time-to-data delay, DISCONNECT_NONE if this command would return
617 * Future sleep algorithms based on time to data can exploit
618 * something like this so they can differentiate between "normal"
619 * (ie, read, write, seek) and unusual commands (ie, * format).
621 * Note : We don't deal with commands that handle an immediate disconnect,
625 static int should_disconnect(unsigned char cmd
)
634 return DISCONNECT_TIME_TO_DATA
;
639 return DISCONNECT_LONG
;
641 return DISCONNECT_NONE
;
646 * Assumes instance->time_expires has been set in higher level code.
649 static int NCR5380_set_timer(struct Scsi_Host
*instance
)
652 struct Scsi_Host
*tmp
, **prev
;
656 if (((struct NCR5380_hostdata
*) (instance
->hostdata
))->next_timer
) {
657 restore_flags(flags
);
660 for (prev
= &expires_first
, tmp
= expires_first
; tmp
;
661 prev
= &(((struct NCR5380_hostdata
*) tmp
->hostdata
)->next_timer
),
662 tmp
= ((struct NCR5380_hostdata
*) tmp
->hostdata
)->next_timer
)
663 if (((struct NCR5380_hostdata
*)instance
->hostdata
)->time_expires
<
664 ((struct NCR5380_hostdata
*)tmp
->hostdata
)->time_expires
)
667 ((struct NCR5380_hostdata
*) instance
->hostdata
)->next_timer
= tmp
;
670 del_timer(&usleep_timer
);
671 usleep_timer
.expires
= ((struct NCR5380_hostdata
*) expires_first
->hostdata
)->time_expires
;
672 add_timer(&usleep_timer
);
673 restore_flags(flags
);
677 /* Doing something about unwanted reentrancy here might be useful */
678 void NCR5380_timer_fn(unsigned long surplus_to_requirements
)
681 struct Scsi_Host
*instance
;
684 for (; expires_first
&&
685 time_before_eq(((struct NCR5380_hostdata
*)expires_first
->hostdata
)->time_expires
, jiffies
); )
687 instance
= ((struct NCR5380_hostdata
*) expires_first
->hostdata
)->next_timer
;
688 ((struct NCR5380_hostdata
*) expires_first
->hostdata
)->next_timer
= NULL
;
689 ((struct NCR5380_hostdata
*) expires_first
->hostdata
)->time_expires
= 0;
690 expires_first
= instance
;
693 del_timer(&usleep_timer
);
696 usleep_timer
.expires
= ((struct NCR5380_hostdata
*)expires_first
->hostdata
)->time_expires
;
697 add_timer(&usleep_timer
);
699 restore_flags(flags
);
701 spin_lock_irqsave(&io_request_lock
, flags
);
703 spin_unlock_irqrestore(&io_request_lock
, flags
);
705 #endif /* def USLEEP */
707 static inline void NCR5380_all_init(void)
711 #if (NDEBUG & NDEBUG_INIT)
712 printk("scsi : NCR5380_all_init()\n");
716 init_timer(&usleep_timer
);
717 usleep_timer
.function
= NCR5380_timer_fn
;
724 * Function : int NCR5380_probe_irq (struct Scsi_Host *instance, int possible)
726 * Purpose : autoprobe for the IRQ line used by the NCR5380.
728 * Inputs : instance - pointer to this instance of the NCR5380 driver,
729 * possible - bitmask of permissible interrupts.
731 * Returns : number of the IRQ selected, IRQ_NONE if no interrupt fired.
733 * XXX no effort is made to deal with spurious interrupts.
737 static int probe_irq __initdata
= 0;
739 static void __init
probe_intr(int irq
, void *dev_id
, struct pt_regs
*regs
)
744 static int __init
NCR5380_probe_irq(struct Scsi_Host
*instance
, int possible
)
746 NCR5380_local_declare();
747 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*)
749 unsigned long timeout
;
750 int trying_irqs
, i
, mask
;
751 NCR5380_setup(instance
);
753 for (trying_irqs
= i
= 0, mask
= 1; i
< 16; ++i
, mask
<<= 1)
754 if ((mask
& possible
) && (request_irq(i
, &probe_intr
, SA_INTERRUPT
, "NCR-probe", NULL
)
758 timeout
= jiffies
+ (250 * HZ
/ 1000);
759 probe_irq
= IRQ_NONE
;
762 * A interrupt is triggered whenever BSY = false, SEL = true
763 * and a bit set in the SELECT_ENABLE_REG is asserted on the
766 * Note that the bus is only driven when the phase control signals
767 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that
771 NCR5380_write(TARGET_COMMAND_REG
, 0);
772 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
773 NCR5380_write(OUTPUT_DATA_REG
, hostdata
->id_mask
);
774 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
|
777 while (probe_irq
== IRQ_NONE
&& time_before(jiffies
,timeout
))
780 NCR5380_write(SELECT_ENABLE_REG
, 0);
781 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
783 for (i
= 0, mask
= 1; i
< 16; ++i
, mask
<<= 1)
784 if (trying_irqs
& mask
)
789 #endif /* AUTOPROBE_IRQ */
792 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
794 * Purpose : called by probe code indicating the NCR5380 driver
795 * options that were selected.
797 * Inputs : instance, pointer to this instance. Unused.
800 static void __init
NCR5380_print_options(struct Scsi_Host
*instance
)
802 printk(" generic options"
832 printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL
, USLEEP_SLEEP
);
834 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE
);
835 if (((struct NCR5380_hostdata
*) instance
->hostdata
)->flags
& FLAG_NCR53C400
) {
836 printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE
);
841 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
843 * Purpose : print commands in the various queues, called from
844 * NCR5380_abort and NCR5380_debug to aid debugging.
846 * Inputs : instance, pointer to this instance.
849 static void NCR5380_print_status(struct Scsi_Host
*instance
)
851 static char pr_bfr
[512];
855 printk("NCR5380 : coroutine is%s running.\n",
856 main_running
? "" : "n't");
859 NCR5380_print(instance
);
860 NCR5380_print_phase(instance
);
863 len
= NCR5380_proc_info(pr_bfr
, &start
, 0, sizeof(pr_bfr
),
864 instance
->host_no
, 0);
866 printk("\n%s\n", pr_bfr
);
869 /******************************************/
871 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
873 * *buffer: I/O buffer
874 * **start: if inout == FALSE pointer into buffer where user read should start
875 * offset: current offset
876 * length: length of buffer
877 * hostno: Scsi_Host host_no
878 * inout: TRUE - user is writing; FALSE - user is reading
880 * Return the number of bytes read from or written
884 #define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0)
886 char *lprint_Scsi_Cmnd(Scsi_Cmnd
* cmd
, char *pos
, char *buffer
, int length
);
888 char *lprint_command(unsigned char *cmd
, char *pos
, char *buffer
, int len
);
890 char *lprint_opcode(int opcode
, char *pos
, char *buffer
, int length
);
892 #ifndef NCR5380_proc_info
895 int NCR5380_proc_info(
896 char *buffer
, char **start
, off_t offset
,
897 int length
, int hostno
, int inout
)
901 struct Scsi_Host
*instance
;
902 struct NCR5380_hostdata
*hostdata
;
905 for (instance
= first_instance
; instance
&&
906 instance
->host_no
!= hostno
; instance
= instance
->next
);
909 hostdata
= (struct NCR5380_hostdata
*) instance
->hostdata
;
911 if (inout
) { /* Has data been written to the file ? */
912 #ifdef DTC_PUBLIC_RELEASE
913 dtc_wmaxi
= dtc_maxi
= 0;
915 #ifdef PAS16_PUBLIC_RELEASE
916 pas_wmaxi
= pas_maxi
= 0;
918 return (-ENOSYS
); /* Currently this is a no-op */
920 SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE
);
921 if (((struct NCR5380_hostdata
*) instance
->hostdata
)->flags
& FLAG_NCR53C400
)
922 SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE
);
923 #ifdef DTC_PUBLIC_RELEASE
924 SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE
);
926 #ifdef T128_PUBLIC_RELEASE
927 SPRINTF("T128 release %d", T128_PUBLIC_RELEASE
);
929 #ifdef GENERIC_NCR5380_PUBLIC_RELEASE
930 SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE
);
932 #ifdef PAS16_PUBLIC_RELEASE
933 SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE
);
936 SPRINTF("\nBase Addr: 0x%05lX ", (long) instance
->base
);
937 SPRINTF("io_port: %04x ", (int) instance
->io_port
);
938 if (instance
->irq
== IRQ_NONE
)
939 SPRINTF("IRQ: None.\n");
941 SPRINTF("IRQ: %d.\n", instance
->irq
);
943 #ifdef DTC_PUBLIC_RELEASE
944 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n",
945 dtc_wmaxi
, dtc_maxi
);
947 #ifdef PAS16_PUBLIC_RELEASE
948 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n",
949 pas_wmaxi
, pas_maxi
);
953 SPRINTF("NCR5380 : coroutine is%s running.\n", main_running
? "" : "n't");
954 if (!hostdata
->connected
)
955 SPRINTF("scsi%d: no currently connected command\n", instance
->host_no
);
957 pos
= lprint_Scsi_Cmnd((Scsi_Cmnd
*) hostdata
->connected
,
958 pos
, buffer
, length
);
959 SPRINTF("scsi%d: issue_queue\n", instance
->host_no
);
960 for (ptr
= (Scsi_Cmnd
*) hostdata
->issue_queue
; ptr
;
961 ptr
= (Scsi_Cmnd
*) ptr
->host_scribble
)
962 pos
= lprint_Scsi_Cmnd(ptr
, pos
, buffer
, length
);
964 SPRINTF("scsi%d: disconnected_queue\n", instance
->host_no
);
965 for (ptr
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
; ptr
;
966 ptr
= (Scsi_Cmnd
*) ptr
->host_scribble
)
967 pos
= lprint_Scsi_Cmnd(ptr
, pos
, buffer
, length
);
969 restore_flags(flags
);
971 if (pos
- buffer
< offset
)
973 else if (pos
- buffer
- offset
< length
)
974 return pos
- buffer
- offset
;
979 char *lprint_Scsi_Cmnd(Scsi_Cmnd
* cmd
, char *pos
, char *buffer
, int length
)
981 SPRINTF("scsi%d : destination target %d, lun %d\n",
982 cmd
->host
->host_no
, cmd
->target
, cmd
->lun
);
983 SPRINTF(" command = ");
984 pos
= lprint_command(cmd
->cmnd
, pos
, buffer
, length
);
989 char *lprint_command(unsigned char *command
,
990 char *pos
, char *buffer
, int length
)
993 pos
= lprint_opcode(command
[0], pos
, buffer
, length
);
994 for (i
= 1, s
= COMMAND_SIZE(command
[0]); i
< s
; ++i
)
995 SPRINTF("%02x ", command
[i
]);
1001 char *lprint_opcode(int opcode
, char *pos
, char *buffer
, int length
)
1003 SPRINTF("%2d (0x%02x)", opcode
, opcode
);
1009 * Function : void NCR5380_init (struct Scsi_Host *instance, flags)
1011 * Purpose : initializes *instance and corresponding 5380 chip,
1012 * with flags OR'd into the initial flags value.
1014 * Inputs : instance - instantiation of the 5380 driver.
1016 * Notes : I assume that the host, hostno, and id bits have been
1017 * set correctly. I don't care about the irq and other fields.
1021 static void __init
NCR5380_init(struct Scsi_Host
*instance
, int flags
)
1023 NCR5380_local_declare();
1025 unsigned long timeout
;
1026 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*)
1030 * On NCR53C400 boards, NCR5380 registers are mapped 8 past
1035 if (flags
& FLAG_NCR53C400
)
1036 instance
->NCR5380_instance_name
+= NCR53C400_address_adjust
;
1039 NCR5380_setup(instance
);
1043 hostdata
->aborted
= 0;
1044 hostdata
->id_mask
= 1 << instance
->this_id
;
1045 for (i
= hostdata
->id_mask
; i
<= 0x80; i
<<= 1)
1046 if (i
> hostdata
->id_mask
)
1047 hostdata
->id_higher_mask
|= i
;
1048 for (i
= 0; i
< 8; ++i
)
1049 hostdata
->busy
[i
] = 0;
1051 hostdata
->dmalen
= 0;
1053 hostdata
->targets_present
= 0;
1054 hostdata
->connected
= NULL
;
1055 hostdata
->issue_queue
= NULL
;
1056 hostdata
->disconnected_queue
= NULL
;
1057 #ifdef NCR5380_STATS
1058 for (i
= 0; i
< 8; ++i
) {
1059 hostdata
->time_read
[i
] = 0;
1060 hostdata
->time_write
[i
] = 0;
1061 hostdata
->bytes_read
[i
] = 0;
1062 hostdata
->bytes_write
[i
] = 0;
1064 hostdata
->timebase
= 0;
1065 hostdata
->pendingw
= 0;
1066 hostdata
->pendingr
= 0;
1069 /* The CHECK code seems to break the 53C400. Will check it later maybe */
1070 if (flags
& FLAG_NCR53C400
)
1071 hostdata
->flags
= FLAG_HAS_LAST_BYTE_SENT
| flags
;
1073 hostdata
->flags
= FLAG_CHECK_LAST_BYTE_SENT
| flags
;
1075 if (!the_template
) {
1076 the_template
= instance
->hostt
;
1077 first_instance
= instance
;
1080 hostdata
->time_expires
= 0;
1081 hostdata
->next_timer
= NULL
;
1085 if ((instance
->cmd_per_lun
> 1) || instance
->can_queue
> 1)
1087 printk("scsi%d : WARNING : support for multiple outstanding commands enabled\n"
1088 " without AUTOSENSE option, contingent allegiance conditions may\n"
1089 " be incorrectly cleared.\n", instance
->host_no
);
1090 #endif /* def AUTOSENSE */
1092 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1093 NCR5380_write(MODE_REG
, MR_BASE
);
1094 NCR5380_write(TARGET_COMMAND_REG
, 0);
1095 NCR5380_write(SELECT_ENABLE_REG
, 0);
1098 if (hostdata
->flags
& FLAG_NCR53C400
) {
1099 NCR5380_write(C400_CONTROL_STATUS_REG
, CSR_BASE
);
1104 * Detect and correct bus wedge problems.
1106 * If the system crashed, it may have crashed in a state
1107 * where a SCSI command was still executing, and the
1108 * SCSI bus is not in a BUS FREE STATE.
1110 * If this is the case, we'll try to abort the currently
1111 * established nexus which we know nothing about, and that
1112 * failing, do a hard reset of the SCSI bus
1115 for (pass
= 1; (NCR5380_read(STATUS_REG
) & SR_BSY
) &&
1116 pass
<= 6; ++pass
) {
1121 printk("scsi%d: SCSI bus busy, waiting up to five seconds\n",
1123 timeout
= jiffies
+ 5 * HZ
;
1124 while (time_before(jiffies
,timeout
) && (NCR5380_read(STATUS_REG
) & SR_BSY
));
1127 printk("scsi%d: bus busy, attempting abort\n",
1132 printk("scsi%d: bus busy, attempting reset\n",
1137 printk("scsi%d: bus locked solid or invalid override\n",
1144 * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd,
1145 * void (*done)(Scsi_Cmnd *))
1147 * Purpose : enqueues a SCSI command
1149 * Inputs : cmd - SCSI command, done - function called on completion, with
1150 * a pointer to the command descriptor.
1155 * cmd is added to the per instance issue_queue, with minor
1156 * twiddling done to the host specific fields of cmd. If the
1157 * main coroutine is not running, it is restarted.
1161 /* Only make static if a wrapper function is used */
1162 #ifndef NCR5380_queue_command
1165 int NCR5380_queue_command(Scsi_Cmnd
* cmd
, void (*done
) (Scsi_Cmnd
*)) {
1166 struct Scsi_Host
*instance
= cmd
->host
;
1167 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*)
1171 #if (NDEBUG & NDEBUG_NO_WRITE)
1172 switch (cmd
->cmnd
[0]) {
1175 printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n",
1177 cmd
->result
= (DID_ERROR
<< 16);
1181 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
1183 #ifdef NCR5380_STATS
1185 if (!hostdata
->connected
&& !hostdata
->issue_queue
&&
1186 !hostdata
->disconnected_queue
) {
1187 hostdata
->timebase
= jiffies
;
1190 #ifdef NCR5380_STAT_LIMIT
1191 if (cmd
->request_bufflen
> NCR5380_STAT_LIMIT
)
1193 switch (cmd
->cmnd
[0]) {
1197 hostdata
->time_write
[cmd
->target
] -= (jiffies
- hostdata
->timebase
);
1198 hostdata
->bytes_write
[cmd
->target
] += cmd
->request_bufflen
;
1199 hostdata
->pendingw
++;
1204 hostdata
->time_read
[cmd
->target
] -= (jiffies
- hostdata
->timebase
);
1205 hostdata
->bytes_read
[cmd
->target
] += cmd
->request_bufflen
;
1206 hostdata
->pendingr
++;
1212 * We use the host_scribble field as a pointer to the next command
1216 cmd
->host_scribble
= NULL
;
1217 cmd
->scsi_done
= done
;
1223 * Insert the cmd into the issue queue. Note that REQUEST SENSE
1224 * commands are added to the head of the queue since any command will
1225 * clear the contingent allegiance condition that exists and the
1226 * sense data is only guaranteed to be valid while the condition exists.
1230 if (!(hostdata
->issue_queue
) || (cmd
->cmnd
[0] == REQUEST_SENSE
)) {
1231 LIST(cmd
, hostdata
->issue_queue
);
1232 cmd
->host_scribble
= (unsigned char *) hostdata
->issue_queue
;
1233 hostdata
->issue_queue
= cmd
;
1235 for (tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
; tmp
->host_scribble
;
1236 tmp
= (Scsi_Cmnd
*) tmp
->host_scribble
);
1238 tmp
->host_scribble
= (unsigned char *) cmd
;
1240 #if (NDEBUG & NDEBUG_QUEUES)
1241 printk("scsi%d : command added to %s of queue\n", instance
->host_no
,
1242 (cmd
->cmnd
[0] == REQUEST_SENSE
) ? "head" : "tail");
1245 /* Run the coroutine if it isn't already running. */
1251 * Function : NCR5380_main (void)
1253 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1254 * be done on the NCR5380 host adapters in a system. Both
1255 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1256 * in case it is not running.
1258 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
1259 * reenable them. This prevents reentrancy and kernel stack overflow.
1262 static void NCR5380_main(void) {
1263 Scsi_Cmnd
*tmp
, *prev
;
1264 struct Scsi_Host
*instance
;
1265 struct NCR5380_hostdata
*hostdata
;
1267 unsigned long flags
;
1270 * We run (with interrupts disabled) until we're sure that none of
1271 * the host adapters have anything that can be done, at which point
1272 * we set main_running to 0 and exit.
1274 * Interrupts are enabled before doing various other internal
1275 * instructions, after we've decided that we need to run through
1278 * this should prevent any race conditions.
1281 spin_unlock_irq(&io_request_lock
);
1286 cli(); /* Freeze request queues */
1288 for (instance
= first_instance
; instance
&&
1289 instance
->hostt
== the_template
; instance
= instance
->next
) {
1290 hostdata
= (struct NCR5380_hostdata
*) instance
->hostdata
;
1293 if (!hostdata
->connected
&& !hostdata
->selecting
) {
1295 if (!hostdata
->connected
) {
1297 #if (NDEBUG & NDEBUG_MAIN)
1298 printk("scsi%d : not connected\n", instance
->host_no
);
1301 * Search through the issue_queue for a command destined
1302 * for a target that's not busy.
1304 #if (NDEBUG & NDEBUG_LISTS)
1305 for (tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
, prev
= NULL
; tmp
&& (tmp
!= prev
); prev
= tmp
, tmp
= (Scsi_Cmnd
*) tmp
->host_scribble
);
1306 /*printk("%p ", tmp); */
1307 if ((tmp
== prev
) && tmp
)
1308 printk(" LOOP\n"); /* else printk("\n"); */
1310 for (tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
,
1311 prev
= NULL
; tmp
; prev
= tmp
, tmp
= (Scsi_Cmnd
*)
1312 tmp
->host_scribble
) {
1314 #if (NDEBUG & NDEBUG_LISTS)
1316 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp
, tmp
->target
, hostdata
->busy
[tmp
->target
], tmp
->lun
);
1318 /* When we find one, remove it from the issue queue. */
1319 if (!(hostdata
->busy
[tmp
->target
] & (1 << tmp
->lun
))) {
1321 REMOVE(prev
, prev
->host_scribble
, tmp
, tmp
->host_scribble
);
1322 prev
->host_scribble
= tmp
->host_scribble
;
1324 REMOVE(-1, hostdata
->issue_queue
, tmp
, tmp
->host_scribble
);
1325 hostdata
->issue_queue
= (Scsi_Cmnd
*) tmp
->host_scribble
;
1327 tmp
->host_scribble
= NULL
;
1329 /* reenable interrupts after finding one */
1330 restore_flags(flags
);
1333 * Attempt to establish an I_T_L nexus here.
1334 * On success, instance->hostdata->connected is set.
1335 * On failure, we must add the command back to the
1336 * issue queue so we can keep trying.
1338 #if (NDEBUG & (NDEBUG_MAIN | NDEBUG_QUEUES))
1339 printk("scsi%d : main() : command for target %d lun %d removed from issue_queue\n",
1340 instance
->host_no
, tmp
->target
, tmp
->lun
);
1344 * A successful selection is defined as one that
1345 * leaves us with the command connected and
1346 * in hostdata->connected, OR has terminated the
1349 * With successful commands, we fall through
1350 * and see if we can do an information transfer,
1351 * with failures we will restart.
1354 hostdata
->selecting
= 0; /* RvC: have to preset this
1355 to indicate a new command is being performed */
1358 if (!NCR5380_select(instance
, tmp
,
1360 * REQUEST SENSE commands are issued without tagged
1361 * queueing, even on SCSI-II devices because the
1362 * contingent allegiance condition exists for the
1365 (tmp
->cmnd
[0] == REQUEST_SENSE
) ? TAG_NONE
:
1370 LIST(tmp
, hostdata
->issue_queue
);
1371 tmp
->host_scribble
= (unsigned char *)
1372 hostdata
->issue_queue
;
1373 hostdata
->issue_queue
= tmp
;
1375 restore_flags(flags
);
1376 #if (NDEBUG & (NDEBUG_MAIN | NDEBUG_QUEUES))
1377 printk("scsi%d : main(): select() failed, returned to issue_queue\n",
1381 } /* if target/lun is not busy */
1383 } /* if (!hostdata->connected) */
1385 if (hostdata
->selecting
)
1387 tmp
= (Scsi_Cmnd
*)hostdata
->selecting
;
1388 if (!NCR5380_select(instance
, tmp
,
1389 (tmp
->cmnd
[0] == REQUEST_SENSE
) ? TAG_NONE
: TAG_NEXT
))
1395 /* RvC: device failed, so we wait a long time
1396 this is needed for Mustek scanners, that
1397 do not respond to commands immediately
1399 printk(KERN_DEBUG
"scsi%d: device %d did not respond in time\n",
1400 instance
->host_no
, tmp
->target
);
1402 LIST(tmp
, hostdata
->issue_queue
);
1403 tmp
->host_scribble
= (unsigned char *) hostdata
->issue_queue
;
1404 hostdata
->issue_queue
= tmp
;
1405 restore_flags(flags
);
1407 hostdata
->time_expires
= jiffies
+ USLEEP_WAITLONG
;
1408 NCR5380_set_timer (instance
);
1410 } /* if hostdata->selecting */
1412 if (hostdata
->connected
1414 && !hostdata
->dmalen
1417 && (!hostdata
->time_expires
|| time_before_eq(hostdata
->time_expires
, jiffies
))
1420 restore_flags(flags
);
1421 #if (NDEBUG & NDEBUG_MAIN)
1422 printk("scsi%d : main() : performing information transfer\n",
1425 NCR5380_information_transfer(instance
);
1426 #if (NDEBUG & NDEBUG_MAIN)
1427 printk("scsi%d : main() : done set false\n", instance
->host_no
);
1432 } /* for instance */
1434 spin_lock_irq(&io_request_lock
);
1439 #ifndef DONT_USE_INTR
1440 #include <linux/blk.h>
1441 #include <linux/spinlock.h>
1444 * Function : void NCR5380_intr (int irq)
1446 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1447 * from the disconnected queue, and restarting NCR5380_main()
1450 * Inputs : int irq, irq that caused this interrupt.
1454 static void NCR5380_intr(int irq
, void *dev_id
, struct pt_regs
*regs
) {
1455 NCR5380_local_declare();
1456 struct Scsi_Host
*instance
;
1459 unsigned long flags
;
1463 #if (NDEBUG & NDEBUG_INTR)
1464 printk("scsi : NCR5380 irq %d triggered\n", irq
);
1468 for (instance
= first_instance
; instance
&& (instance
->hostt
==
1469 the_template
); instance
= instance
->next
)
1470 if (instance
->irq
== irq
) {
1472 /* Look for pending interrupts */
1473 NCR5380_setup(instance
);
1474 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
1475 /* XXX dispatch to appropriate routine if found and done=0 */
1476 if (basr
& BASR_IRQ
) {
1477 #if (NDEBUG & NDEBUG_INTR)
1478 NCR5380_print(instance
);
1480 if ((NCR5380_read(STATUS_REG
) & (SR_SEL
| SR_IO
)) ==
1483 restore_flags(flags
);
1484 #if (NDEBUG & NDEBUG_INTR)
1485 printk("scsi%d : SEL interrupt\n", instance
->host_no
);
1487 NCR5380_reselect(instance
);
1488 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1489 } else if (basr
& BASR_PARITY_ERROR
) {
1490 #if (NDEBUG & NDEBUG_INTR)
1491 printk("scsi%d : PARITY interrupt\n", instance
->host_no
);
1493 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1494 } else if ((NCR5380_read(STATUS_REG
) & SR_RST
) == SR_RST
) {
1495 #if (NDEBUG & NDEBUG_INTR)
1496 printk("scsi%d : RESET interrupt\n", instance
->host_no
);
1498 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1501 * XXX the rest of the interrupt conditions should *only* occur during a
1502 * DMA transfer, which I haven't gotten around to fixing yet.
1505 #if defined(REAL_DMA)
1507 * We should only get PHASE MISMATCH and EOP interrupts
1508 * if we have DMA enabled, so do a sanity check based on
1509 * the current setting of the MODE register.
1512 if ((NCR5380_read(MODE_REG
) & MR_DMA
) && ((basr
&
1513 BASR_END_DMA_TRANSFER
) ||
1514 !(basr
& BASR_PHASE_MATCH
))) {
1517 if (!hostdata
->connected
)
1518 panic("scsi%d : received end of DMA interrupt with no connected cmd\n",
1521 transfered
= (hostdata
->dmalen
- NCR5380_dma_residual(instance
));
1522 hostdata
->connected
->SCp
.this_residual
-= transferred
;
1523 hostdata
->connected
->SCp
.ptr
+= transferred
;
1524 hostdata
->dmalen
= 0;
1526 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1529 unsigned long timeout
= jiffies
+ NCR_TIMEOUT
;
1531 spin_unlock_irq(&io_request_lock
);
1532 while (NCR5380_read(BUS_AND_STATUS_REG
) & BASR_ACK
1533 && time_before(jiffies
, timeout
));
1534 spin_lock_irq(&io_request_lock
);
1536 if (time_after_eq(jiffies
, timeout
) )
1537 printk("scsi%d: timeout at NCR5380.c:%d\n",
1538 host
->host_no
, __LINE__
);
1540 #else /* NCR_TIMEOUT */
1541 while (NCR5380_read(BUS_AND_STATUS_REG
) & BASR_ACK
);
1544 NCR5380_write(MODE_REG
, MR_BASE
);
1545 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1548 #if (NDEBUG & NDEBUG_INTR)
1549 printk("scsi : unknown interrupt, BASR 0x%X, MR 0x%X, SR 0x%x\n", basr
, NCR5380_read(MODE_REG
), NCR5380_read(STATUS_REG
));
1551 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1557 } /* if (instance->irq == irq) */
1562 static void do_NCR5380_intr(int irq
, void *dev_id
, struct pt_regs
*regs
) {
1563 unsigned long flags
;
1565 spin_lock_irqsave(&io_request_lock
, flags
);
1566 NCR5380_intr(irq
, dev_id
, regs
);
1567 spin_unlock_irqrestore(&io_request_lock
, flags
);
1572 #ifdef NCR5380_STATS
1573 static void collect_stats(struct NCR5380_hostdata
*hostdata
, Scsi_Cmnd
* cmd
) {
1574 #ifdef NCR5380_STAT_LIMIT
1575 if (cmd
->request_bufflen
> NCR5380_STAT_LIMIT
)
1577 switch (cmd
->cmnd
[0]) {
1581 hostdata
->time_write
[cmd
->target
] += (jiffies
- hostdata
->timebase
);
1582 /*hostdata->bytes_write[cmd->target] += cmd->request_bufflen; */
1583 hostdata
->pendingw
--;
1588 hostdata
->time_read
[cmd
->target
] += (jiffies
- hostdata
->timebase
);
1589 /*hostdata->bytes_read[cmd->target] += cmd->request_bufflen; */
1590 hostdata
->pendingr
--;
1596 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
1599 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1600 * including ARBITRATION, SELECTION, and initial message out for
1601 * IDENTIFY and queue messages.
1603 * Inputs : instance - instantiation of the 5380 driver on which this
1604 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1605 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1606 * the command that is presently connected.
1608 * Returns : -1 if selection could not execute for some reason,
1609 * 0 if selection succeeded or failed because the target
1613 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1614 * with registers as they should have been on entry - ie
1615 * SELECT_ENABLE will be set appropriately, the NCR5380
1616 * will cease to drive any SCSI bus signals.
1618 * If successful : I_T_L or I_T_L_Q nexus will be established,
1619 * instance->connected will be set to cmd.
1620 * SELECT interrupt will be disabled.
1622 * If failed (no target) : cmd->scsi_done() will be called, and the
1623 * cmd->result host byte set to DID_BAD_TARGET.
1625 static int NCR5380_select(struct Scsi_Host
*instance
, Scsi_Cmnd
* cmd
, int tag
) {
1626 NCR5380_local_declare();
1627 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*) instance
->hostdata
;
1628 unsigned char tmp
[3], phase
;
1629 unsigned char *data
;
1631 unsigned long timeout
;
1632 unsigned long flags
;
1634 unsigned char value
;
1637 NCR5380_setup(instance
);
1641 if (hostdata
->selecting
)
1643 goto part2
; /* RvC: sorry prof. Dijkstra, but it keeps the
1644 rest of the code nearly the same */
1648 hostdata
->restart_select
= 0;
1649 #if defined (NDEBUG) && (NDEBUG & NDEBUG_ARBITRATION)
1650 NCR5380_print(instance
);
1651 printk("scsi%d : starting arbitration, id = %d\n", instance
->host_no
,
1658 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1659 * data bus during SELECTION.
1662 NCR5380_write(TARGET_COMMAND_REG
, 0);
1666 * Start arbitration.
1669 NCR5380_write(OUTPUT_DATA_REG
, hostdata
->id_mask
);
1670 NCR5380_write(MODE_REG
, MR_ARBITRATE
);
1672 restore_flags(flags
);
1674 /* Wait for arbitration logic to complete */
1677 unsigned long timeout
= jiffies
+ 2 * NCR_TIMEOUT
;
1679 spin_unlock_irq(&io_request_lock
);
1681 while (!(NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_PROGRESS
)
1682 && time_before(jiffies
,timeout
));
1684 spin_lock_irq(&io_request_lock
);
1686 if (time_after_eq(jiffies
,timeout
)) {
1687 printk("scsi: arbitration timeout at %d\n", __LINE__
);
1688 NCR5380_write(MODE_REG
, MR_BASE
);
1689 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1693 #else /* NCR_TIMEOUT */
1694 while (!(NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_PROGRESS
));
1697 #if (NDEBUG & NDEBUG_ARBITRATION)
1698 printk("scsi%d : arbitration complete\n", instance
->host_no
);
1699 /* Avoid GCC 2.4.5 asm needs to many reloads error */
1704 * The arbitration delay is 2.2us, but this is a minimum and there is
1705 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1706 * the integral nature of udelay().
1712 /* Check for lost arbitration */
1713 if ((NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1714 (NCR5380_read(CURRENT_SCSI_DATA_REG
) & hostdata
->id_higher_mask
) ||
1715 (NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
)) {
1716 NCR5380_write(MODE_REG
, MR_BASE
);
1717 #if (NDEBUG & NDEBUG_ARBITRATION)
1718 printk("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n",
1723 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_SEL
);
1725 if (!(hostdata
->flags
& FLAG_DTC3181E
) &&
1726 /* RvC: DTC3181E has some trouble with this
1727 * so we simply removed it. Seems to work with
1728 * only Mustek scanner attached
1730 (NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
))
1732 NCR5380_write(MODE_REG
, MR_BASE
);
1733 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1734 #if (NDEBUG & NDEBUG_ARBITRATION)
1735 printk("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n",
1741 * Again, bus clear + bus settle time is 1.2us, however, this is
1742 * a minimum so we'll udelay ceil(1.2)
1747 #if (NDEBUG & NDEBUG_ARBITRATION)
1748 printk("scsi%d : won arbitration\n", instance
->host_no
);
1753 * Now that we have won arbitration, start Selection process, asserting
1754 * the host and target ID's on the SCSI bus.
1757 NCR5380_write(OUTPUT_DATA_REG
, (hostdata
->id_mask
| (1 << cmd
->target
)));
1760 * Raise ATN while SEL is true before BSY goes false from arbitration,
1761 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1762 * phase immediately after selection.
1765 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_BSY
|
1766 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1767 NCR5380_write(MODE_REG
, MR_BASE
);
1770 * Reselect interrupts must be turned off prior to the dropping of BSY,
1771 * otherwise we will trigger an interrupt.
1773 NCR5380_write(SELECT_ENABLE_REG
, 0);
1776 * The initiator shall then wait at least two deskew delays and release
1779 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1782 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_DATA
|
1783 ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1786 * Something weird happens when we cease to drive BSY - looks
1787 * like the board/chip is letting us do another read before the
1788 * appropriate propagation delay has expired, and we're confusing
1789 * a BSY signal from ourselves as the target's response to SELECTION.
1791 * A small delay (the 'C++' frontend breaks the pipeline with an
1792 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1793 * tighter 'C' code breaks and requires this) solves the problem -
1794 * the 1 us delay is arbitrary, and only used because this delay will
1795 * be the same on other platforms and since it works here, it should
1798 * wingel suggests that this could be due to failing to wait
1804 #if (NDEBUG & NDEBUG_SELECTION)
1805 printk("scsi%d : selecting target %d\n", instance
->host_no
, cmd
->target
);
1809 * The SCSI specification calls for a 250 ms timeout for the actual
1813 timeout
= jiffies
+ (250 * HZ
/ 1000);
1816 * XXX very interesting - we're seeing a bounce where the BSY we
1817 * asserted is being reflected / still asserted (propagation delay?)
1818 * and it's detecting as true. Sigh.
1822 hostdata
->select_time
= 0; /* we count the clock ticks at which we polled */
1823 hostdata
->selecting
= cmd
;
1826 /* RvC: here we enter after a sleeping period, or immediately after
1828 we poll only once ech clock tick */
1829 value
= NCR5380_read(STATUS_REG
) & (SR_BSY
| SR_IO
);
1831 if (!value
&& (hostdata
->select_time
< 25))
1833 /* RvC: we still must wait for a device response */
1834 hostdata
->select_time
++; /* after 25 ticks the device has failed */
1835 hostdata
->time_expires
= jiffies
+ 1;
1836 NCR5380_set_timer(instance
);
1837 return 0; /* RvC: we return here with hostdata->selecting set,
1841 hostdata
->selecting
= 0; /* clear this pointer, because we passed the
1844 spin_unlock_irq(&io_request_lock
);
1845 while (time_before(jiffies
, timeout
) && !(NCR5380_read(STATUS_REG
) &
1847 spin_lock_irq(&io_request_lock
);
1849 if ((NCR5380_read(STATUS_REG
) & (SR_SEL
| SR_IO
)) ==
1851 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1852 NCR5380_reselect(instance
);
1853 printk("scsi%d : reselection after won arbitration?\n",
1855 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1859 * No less than two deskew delays after the initiator detects the
1860 * BSY signal is true, it shall release the SEL signal and may
1861 * change the DATA BUS. -wingel
1866 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1868 if (!(NCR5380_read(STATUS_REG
) & SR_BSY
)) {
1869 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1870 if (hostdata
->targets_present
& (1 << cmd
->target
)) {
1871 printk("scsi%d : weirdness\n", instance
->host_no
);
1872 if (hostdata
->restart_select
)
1873 printk("\trestart select\n");
1874 #if (NDEBUG & NDEBUG_SELECTION)
1875 NCR5380_print(instance
);
1877 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1880 cmd
->result
= DID_BAD_TARGET
<< 16;
1881 #ifdef NCR5380_STATS
1882 collect_stats(hostdata
, cmd
);
1884 cmd
->scsi_done(cmd
);
1885 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1886 #if (NDEBUG & NDEBUG_SELECTION)
1887 printk("scsi%d : target did not respond within 250ms\n",
1890 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1893 hostdata
->targets_present
|= (1 << cmd
->target
);
1896 * Since we followed the SCSI spec, and raised ATN while SEL
1897 * was true but before BSY was false during selection, the information
1898 * transfer phase should be a MESSAGE OUT phase so that we can send the
1901 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1902 * message (2 bytes) with a tag ID that we increment with every command
1903 * until it wraps back to 0.
1905 * XXX - it turns out that there are some broken SCSI-II devices,
1906 * which claim to support tagged queuing but fail when more than
1907 * some number of commands are issued at once.
1910 /* Wait for start of REQ/ACK handshake */
1913 unsigned long timeout
= jiffies
+ NCR_TIMEOUT
;
1915 spin_unlock_irq(&io_request_lock
);
1916 while (!(NCR5380_read(STATUS_REG
) & SR_REQ
) && time_before(jiffies
, timeout
));
1917 spin_lock_irq(&io_request_lock
);
1919 if (time_after_eq(jiffies
, timeout
)) {
1920 printk("scsi%d: timeout at NCR5380.c:%d\n", instance
->host_no
, __LINE__
);
1921 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1925 #else /* NCR_TIMEOUT */
1926 while (!(NCR5380_read(STATUS_REG
) & SR_REQ
));
1927 #endif /* def NCR_TIMEOUT */
1929 #if (NDEBUG & NDEBUG_SELECTION)
1930 printk("scsi%d : target %d selected, going into MESSAGE OUT phase.\n",
1931 instance
->host_no
, cmd
->target
);
1933 tmp
[0] = IDENTIFY(((instance
->irq
== IRQ_NONE
) ? 0 : 1), cmd
->lun
);
1935 if (cmd
->device
->tagged_queue
&& (tag
!= TAG_NONE
)) {
1936 tmp
[1] = SIMPLE_QUEUE_TAG
;
1937 if (tag
== TAG_NEXT
) {
1938 /* 0 is TAG_NONE, used to imply no tag for this command */
1939 if (cmd
->device
->current_tag
== 0)
1940 cmd
->device
->current_tag
= 1;
1942 cmd
->tag
= cmd
->device
->current_tag
;
1943 cmd
->device
->current_tag
++;
1945 cmd
->tag
= (unsigned char) tag
;
1948 hostdata
->last_message
= SIMPLE_QUEUE_TAG
;
1951 #endif /* def SCSI2 */
1957 /* Send message(s) */
1959 phase
= PHASE_MSGOUT
;
1960 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
1961 #if (NDEBUG & NDEBUG_SELECTION)
1962 printk("scsi%d : nexus established.\n", instance
->host_no
);
1964 /* XXX need to handle errors here */
1965 hostdata
->connected
= cmd
;
1967 if (!cmd
->device
->tagged_queue
)
1969 hostdata
->busy
[cmd
->target
] |= (1 << cmd
->lun
);
1971 initialize_SCp(cmd
);
1978 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1979 * unsigned char *phase, int *count, unsigned char **data)
1981 * Purpose : transfers data in given phase using polled I/O
1983 * Inputs : instance - instance of driver, *phase - pointer to
1984 * what phase is expected, *count - pointer to number of
1985 * bytes to transfer, **data - pointer to data pointer.
1987 * Returns : -1 when different phase is entered without transferring
1988 * maximum number of bytes, 0 if all bytes or transfered or exit
1991 * Also, *phase, *count, *data are modified in place.
1993 * XXX Note : handling for bus free may be useful.
1997 * Note : this code is not as quick as it could be, however it
1998 * IS 100% reliable, and for the actual data transfer where speed
1999 * counts, we will always do a pseudo DMA or DMA transfer.
2002 static int NCR5380_transfer_pio(struct Scsi_Host
*instance
,
2003 unsigned char *phase
, int *count
, unsigned char **data
) {
2004 NCR5380_local_declare();
2005 register unsigned char p
= *phase
, tmp
;
2006 register int c
= *count
;
2007 register unsigned char *d
= *data
;
2010 * RvC: some administrative data to process polling time
2012 int break_allowed
= 0;
2013 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*) instance
->hostdata
;
2015 NCR5380_setup(instance
);
2017 #if (NDEBUG & NDEBUG_PIO)
2019 printk("scsi%d : pio write %d bytes\n", instance
->host_no
, c
);
2021 printk("scsi%d : pio read %d bytes\n", instance
->host_no
, c
);
2025 * The NCR5380 chip will only drive the SCSI bus when the
2026 * phase specified in the appropriate bits of the TARGET COMMAND
2027 * REGISTER match the STATUS REGISTER
2030 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
2033 /* RvC: don't know if this is necessary, but other SCSI I/O is short
2034 * so breaks are not necessary there
2036 if ((p
== PHASE_DATAIN
) || (p
== PHASE_DATAOUT
))
2045 * Wait for assertion of REQ, after which the phase bits will be
2050 /* RvC: we simply poll once, after that we stop temporarily
2051 * and let the device buffer fill up
2052 * if breaking is not allowed, we keep polling as long as needed
2055 while ( !((tmp
= NCR5380_read(STATUS_REG
)) & SR_REQ
) &&
2057 if (!(tmp
& SR_REQ
))
2059 /* timeout condition */
2060 hostdata
->time_expires
= jiffies
+ USLEEP_SLEEP
;
2061 NCR5380_set_timer (instance
);
2065 while ( !((tmp
= NCR5380_read(STATUS_REG
)) & SR_REQ
) );
2068 #if (NDEBUG & NDEBUG_HANDSHAKE)
2069 printk("scsi%d : REQ detected\n", instance
->host_no
);
2072 /* Check for phase mismatch */
2073 if ((tmp
& PHASE_MASK
) != p
) {
2074 #if (NDEBUG & NDEBUG_PIO)
2075 printk("scsi%d : phase mismatch\n", instance
->host_no
);
2076 NCR5380_print_phase(instance
);
2080 /* Do actual transfer from SCSI bus to / from memory */ if (!(p
& SR_IO
))
2081 NCR5380_write(OUTPUT_DATA_REG
, *d
);
2083 *d
= NCR5380_read(CURRENT_SCSI_DATA_REG
);
2088 * The SCSI standard suggests that in MSGOUT phase, the initiator
2089 * should drop ATN on the last byte of the message phase
2090 * after REQ has been asserted for the handshake but before
2091 * the initiator raises ACK.
2095 if (!((p
& SR_MSG
) && c
> 1)) {
2096 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2098 #if (NDEBUG & NDEBUG_PIO)
2099 NCR5380_print(instance
);
2101 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2102 ICR_ASSERT_DATA
| ICR_ASSERT_ACK
);
2104 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2105 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
);
2106 #if (NDEBUG & NDEBUG_PIO)
2107 NCR5380_print(instance
);
2109 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2110 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_ACK
);
2113 #if (NDEBUG & NDEBUG_PIO)
2114 NCR5380_print(instance
);
2116 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ACK
);
2119 while (NCR5380_read(STATUS_REG
) & SR_REQ
);
2121 #if (NDEBUG & NDEBUG_HANDSHAKE)
2122 printk("scsi%d : req false, handshake complete\n", instance
->host_no
);
2126 * We have several special cases to consider during REQ/ACK handshaking :
2127 * 1. We were in MSGOUT phase, and we are on the last byte of the
2128 * message. ATN must be dropped as ACK is dropped.
2130 * 2. We are in a MSGIN phase, and we are on the last byte of the
2131 * message. We must exit with ACK asserted, so that the calling
2132 * code may raise ATN before dropping ACK to reject the message.
2134 * 3. ACK and ATN are clear and the target may proceed as normal.
2136 if (!(p
== PHASE_MSGIN
&& c
== 1)) {
2137 if (p
== PHASE_MSGOUT
&& c
> 1)
2138 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
2140 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2144 #if (NDEBUG & NDEBUG_PIO)
2145 printk("scsi%d : residual %d\n", instance
->host_no
, c
);
2150 tmp
= NCR5380_read(STATUS_REG
);
2152 *phase
= tmp
& PHASE_MASK
;
2154 *phase
= PHASE_UNKNOWN
;
2156 if (!c
|| (*phase
== p
))
2162 static void do_reset(struct Scsi_Host
*host
) {
2163 unsigned long flags
;
2164 NCR5380_local_declare();
2165 NCR5380_setup(host
);
2169 NCR5380_write(TARGET_COMMAND_REG
,
2170 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG
) & PHASE_MASK
));
2171 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_RST
);
2173 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2174 restore_flags(flags
);
2177 * Function : do_abort (Scsi_Host *host)
2179 * Purpose : abort the currently established nexus. Should only be
2180 * called from a routine which can drop into a
2182 * Returns : 0 on success, -1 on failure.
2183 */ static int do_abort(struct Scsi_Host
*host
) {
2184 NCR5380_local_declare();
2185 unsigned char tmp
, *msgptr
, phase
;
2187 NCR5380_setup(host
);
2190 /* Request message out phase */
2191 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
2194 * Wait for the target to indicate a valid phase by asserting
2195 * REQ. Once this happens, we'll have either a MSGOUT phase
2196 * and can immediately send the ABORT message, or we'll have some
2197 * other phase and will have to source/sink data.
2199 * We really don't care what value was on the bus or what value
2200 * the target sees, so we just handshake.
2203 while (!(tmp
= NCR5380_read(STATUS_REG
)) & SR_REQ
);
2205 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
2207 if ((tmp
& PHASE_MASK
) != PHASE_MSGOUT
) {
2208 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
|
2210 while (NCR5380_read(STATUS_REG
) & SR_REQ
);
2211 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
2216 phase
= PHASE_MSGOUT
;
2217 NCR5380_transfer_pio(host
, &phase
, &len
, &msgptr
);
2220 * If we got here, and the command completed successfully,
2221 * we're about to go into bus free state.
2224 return len
? -1 : 0;
2227 #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL)
2229 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
2230 * unsigned char *phase, int *count, unsigned char **data)
2232 * Purpose : transfers data in given phase using either real
2235 * Inputs : instance - instance of driver, *phase - pointer to
2236 * what phase is expected, *count - pointer to number of
2237 * bytes to transfer, **data - pointer to data pointer.
2239 * Returns : -1 when different phase is entered without transferring
2240 * maximum number of bytes, 0 if all bytes or transfered or exit
2243 * Also, *phase, *count, *data are modified in place.
2248 static int NCR5380_transfer_dma(struct Scsi_Host
*instance
,
2249 unsigned char *phase
, int *count
, unsigned char **data
) {
2250 NCR5380_local_declare();
2251 register int c
= *count
;
2252 register unsigned char p
= *phase
;
2253 register unsigned char *d
= *data
;
2255 unsigned long flags
;
2257 #if defined(REAL_DMA_POLL)
2259 unsigned char saved_data
= 0, overrun
= 0, residue
;
2262 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*)
2265 NCR5380_setup(instance
);
2267 if ((tmp
= (NCR5380_read(STATUS_REG
) & PHASE_MASK
)) != p
) {
2271 #if defined(REAL_DMA) || defined(REAL_DMA_POLL)
2272 #ifdef READ_OVERRUNS if (p & SR_IO) { c -= 2;
2275 #if (NDEBUG & NDEBUG_DMA)
2276 printk("scsi%d : initializing DMA channel %d for %s, %d bytes %s %0x\n",
2277 instance
->host_no
, instance
->dma_channel
, (p
& SR_IO
) ? "reading" :
2278 "writing", c
, (p
& SR_IO
) ? "to" : "from", (unsigned) d
);
2280 hostdata
->dma_len
= (p
& SR_IO
) ?
2281 NCR5380_dma_read_setup(instance
, d
, c
) :
2282 NCR5380_dma_write_setup(instance
, d
, c
);
2285 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
2288 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
| MR_ENABLE_EOP_INTR
| MR_MONITOR_BSY
);
2289 #elif defined(REAL_DMA_POLL)
2290 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
);
2293 * Note : on my sample board, watch-dog timeouts occurred when interrupts
2294 * were not disabled for the duration of a single DMA transfer, from
2295 * before the setting of DMA mode to after transfer of the last byte.
2298 #if defined(PSEUDO_DMA) && !defined(UNSAFE)
2302 /* KLL May need eop and parity in 53c400 */
2303 if (hostdata
->flags
& FLAG_NCR53C400
)
2304 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
| MR_ENABLE_PAR_CHECK
2305 | MR_ENABLE_PAR_INTR
| MR_ENABLE_EOP_INTR
| MR_DMA_MODE
2308 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
);
2309 #endif /* def REAL_DMA */
2311 #if (NDEBUG & NDEBUG_DMA) & 0
2312 printk("scsi%d : mode reg = 0x%X\n", instance
->host_no
, NCR5380_read(MODE_REG
));
2316 * FOO stuff. For some UNAPPARENT reason, I'm getting
2317 * watchdog timers fired on bootup for NO APPARENT REASON, meaning it's
2318 * probably a timing problem.
2320 * Since this is the only place I have back-to-back writes, perhaps this
2329 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG
, 0);
2334 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
);
2338 NCR5380_write(START_DMA_SEND_REG
, 0);
2344 #if defined(REAL_DMA_POLL)
2346 tmp
= NCR5380_read(BUS_AND_STATUS_REG
);
2347 } while ((tmp
& BASR_PHASE_MATCH
) && !(tmp
& (BASR_BUSY_ERROR
|
2349 BASR_END_DMA_TRANSFER
)));
2352 At this point, either we've completed DMA, or we have a phase mismatch,
2353 or we've unexpectedly lost BUSY (which is a real error).
2355 For write DMAs, we want to wait until the last byte has been
2356 transferred out over the bus before we turn off DMA mode. Alas, there
2357 seems to be no terribly good way of doing this on a 5380 under all
2358 conditions. For non-scatter-gather operations, we can wait until REQ
2359 and ACK both go false, or until a phase mismatch occurs. Gather-writes
2360 are nastier, since the device will be expecting more data than we
2361 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
2362 could test LAST BIT SENT to assure transfer (I imagine this is precisely
2363 why this signal was added to the newer chips) but on the older 538[01]
2364 this signal does not exist. The workaround for this lack is a watchdog;
2365 we bail out of the wait-loop after a modest amount of wait-time if
2366 the usual exit conditions are not met. Not a terribly clean or
2367 correct solution :-%
2369 Reads are equally tricky due to a nasty characteristic of the NCR5380.
2370 If the chip is in DMA mode for an READ, it will respond to a target's
2371 REQ by latching the SCSI data into the INPUT DATA register and asserting
2372 ACK, even if it has _already_ been notified by the DMA controller that
2373 the current DMA transfer has completed! If the NCR5380 is then taken
2374 out of DMA mode, this already-acknowledged byte is lost.
2376 This is not a problem for "one DMA transfer per command" reads, because
2377 the situation will never arise... either all of the data is DMA'ed
2378 properly, or the target switches to MESSAGE IN phase to signal a
2379 disconnection (either operation bringing the DMA to a clean halt).
2380 However, in order to handle scatter-reads, we must work around the
2381 problem. The chosen fix is to DMA N-2 bytes, then check for the
2382 condition before taking the NCR5380 out of DMA mode. One or two extra
2383 bytes are transferred via PIO as necessary to fill out the original
2388 #ifdef READ_OVERRUNS
2390 if (((NCR5380_read(BUS_AND_STATUS_REG
) & (BASR_PHASE_MATCH
| BASR_ACK
)) ==
2391 (BASR_PHASE_MATCH
| BASR_ACK
))) {
2392 saved_data
= NCR5380_read(INPUT_DATA_REGISTER
);
2398 while (((tmp
= NCR5380_read(BUS_AND_STATUS_REG
)) & BASR_ACK
) ||
2399 (NCR5380_read(STATUS_REG
) & SR_REQ
)) {
2400 if (!(tmp
& BASR_PHASE_MATCH
))
2408 #if (NDEBUG & NDEBUG_DMA)
2409 printk("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n",
2410 instance
->host_no
, tmp
, NCR5380_read(STATUS_REG
));
2413 NCR5380_write(MODE_REG
, MR_BASE
);
2414 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2416 residue
= NCR5380_dma_residual(instance
);
2420 *phase
= NCR5380_read(STATUS_REG
) & PHASE_MASK
;
2422 #ifdef READ_OVERRUNS
2423 if (*phase
== p
&& (p
& SR_IO
) && residue
== 0)
2426 #if (NDEBUG & NDEBUG_DMA)
2427 printk("Got an input overrun, using saved byte\n");
2429 **data
= saved_data
;
2434 printk("No overrun??\n");
2437 #if (NDEBUG & NDEBUG_DMA)
2438 printk("Doing %d-byte PIO to 0x%X\n", cnt
, *data
);
2440 NCR5380_transfer_pio(instance
, phase
, &cnt
, data
);
2441 *count
-= toPIO
- cnt
;
2445 #if (NDEBUG & NDEBUG_DMA)
2446 printk("Return with data ptr = 0x%X, count %d, last 0x%X, next 0x%X\n",
2447 *data
, *count
, *(*data
+ *count
- 1), *(*data
+ *count
));
2451 #elif defined(REAL_DMA)
2453 #else /* defined(REAL_DMA_POLL) */
2455 #ifdef DMA_WORKS_RIGHT
2456 foo
= NCR5380_pread(instance
, d
, c
);
2459 if (hostdata
->flags
& FLAG_NCR53C400
) {
2462 if (!(foo
= NCR5380_pread(instance
, d
, c
- diff
))) {
2464 * We can't disable DMA mode after successfully transferring
2465 * what we plan to be the last byte, since that would open up
2466 * a race condition where if the target asserted REQ before
2467 * we got the DMA mode reset, the NCR5380 would have latched
2468 * an additional byte into the INPUT DATA register and we'd
2471 * The workaround was to transfer one fewer bytes than we
2472 * intended to with the pseudo-DMA read function, wait for
2473 * the chip to latch the last byte, read it, and then disable
2476 * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
2477 * REQ is deasserted when ACK is asserted, and not reasserted
2478 * until ACK goes false. Since the NCR5380 won't lower ACK
2479 * until DACK is asserted, which won't happen unless we twiddle
2480 * the DMA port or we take the NCR5380 out of DMA mode, we
2481 * can guarantee that we won't handshake another extra
2485 if (!(hostdata
->flags
& FLAG_NCR53C400
)) {
2486 while (!(NCR5380_read(BUS_AND_STATUS_REG
) & BASR_DRQ
));
2487 /* Wait for clean handshake */
2488 while (NCR5380_read(STATUS_REG
) & SR_REQ
);
2489 d
[c
- 1] = NCR5380_read(INPUT_DATA_REG
);
2494 #ifdef DMA_WORKS_RIGHT
2495 foo
= NCR5380_pwrite(instance
, d
, c
);
2498 #if (NDEBUG & NDEBUG_C400_PWRITE)
2499 printk("About to pwrite %d bytes\n", c
);
2501 if (!(foo
= NCR5380_pwrite(instance
, d
, c
))) {
2503 * Wait for the last byte to be sent. If REQ is being asserted for
2504 * the byte we're interested, we'll ACK it and it will go false.
2506 if (!(hostdata
->flags
& FLAG_HAS_LAST_BYTE_SENT
)) {
2510 while (!(NCR5380_read(BUS_AND_STATUS_REG
) &
2511 BASR_DRQ
) && (NCR5380_read(BUS_AND_STATUS_REG
) &
2514 if (NCR5380_read(STATUS_REG
) & SR_REQ
) {
2516 !(NCR5380_read(BUS_AND_STATUS_REG
) & BASR_ACK
);
2518 for (; timeout
&& (NCR5380_read(STATUS_REG
) & SR_REQ
);
2524 #if (NDEBUG & NDEBUG_LAST_BYTE_SENT)
2526 printk("scsi%d : timed out on last byte\n",
2531 if (hostdata
->flags
& FLAG_CHECK_LAST_BYTE_SENT
) {
2532 hostdata
->flags
&= ~FLAG_CHECK_LAST_BYTE_SENT
;
2533 if (NCR5380_read(TARGET_COMMAND_REG
) & TCR_LAST_BYTE_SENT
) {
2534 hostdata
->flags
|= FLAG_HAS_LAST_BYTE_SENT
;
2535 #if (NDEBUG & NDEBUG_LAST_BYTE_SENT)
2536 printk("scsi%d : last bit sent works\n",
2542 #if (NDEBUG & NDEBUG_C400_PWRITE)
2543 printk("Waiting for LASTBYTE\n");
2545 while (!(NCR5380_read(TARGET_COMMAND_REG
) & TCR_LAST_BYTE_SENT
));
2546 #if (NDEBUG & NDEBUG_C400_PWRITE)
2547 printk("Got LASTBYTE\n");
2556 NCR5380_write(MODE_REG
, MR_BASE
);
2557 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2559 if ((!(p
& SR_IO
)) && (hostdata
->flags
& FLAG_NCR53C400
)) {
2560 #if (NDEBUG & NDEBUG_C400_PWRITE)
2561 printk("53C400w: Checking for IRQ\n");
2563 if (NCR5380_read(BUS_AND_STATUS_REG
) & BASR_IRQ
) {
2564 #if (NDEBUG & NDEBUG_C400_PWRITE)
2565 printk("53C400w: got it, reading reset interrupt reg\n");
2567 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
2569 printk("53C400w: IRQ NOT THERE!\n");
2574 *phase
= NCR5380_read(STATUS_REG
) & PHASE_MASK
;
2576 NCR5380_print_phase(instance
);
2578 #if defined(PSEUDO_DMA) && !defined(UNSAFE)
2579 restore_flags(flags
);
2580 #endif /* defined(REAL_DMA_POLL) */
2582 #endif /* def REAL_DMA */
2584 #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */
2587 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
2589 * Purpose : run through the various SCSI phases and do as the target
2590 * directs us to. Operates on the currently connected command,
2591 * instance->connected.
2593 * Inputs : instance, instance for which we are doing commands
2595 * Side effects : SCSI things happen, the disconnected queue will be
2596 * modified if a command disconnects, *instance->connected will
2599 * XXX Note : we need to watch for bus free or a reset condition here
2600 * to recover from an unexpected bus free condition.
2603 static void NCR5380_information_transfer(struct Scsi_Host
*instance
) {
2604 NCR5380_local_declare();
2605 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*)
2607 unsigned char msgout
= NOP
;
2610 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2613 unsigned char *data
;
2614 unsigned char phase
, tmp
, extended_msg
[10], old_phase
= 0xff;
2615 Scsi_Cmnd
*cmd
= (Scsi_Cmnd
*) hostdata
->connected
;
2617 /* RvC: we need to set the end of the polling time */
2618 unsigned long poll_time
= jiffies
+ USLEEP_POLL
;
2621 NCR5380_setup(instance
);
2624 tmp
= NCR5380_read(STATUS_REG
);
2625 /* We only have a valid SCSI phase when REQ is asserted */
2627 phase
= (tmp
& PHASE_MASK
);
2628 if (phase
!= old_phase
) {
2630 #if (NDEBUG & NDEBUG_INFORMATION)
2631 NCR5380_print_phase(instance
);
2634 if (sink
&& (phase
!= PHASE_MSGOUT
)) {
2635 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
2637 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
|
2639 while (NCR5380_read(STATUS_REG
) & SR_REQ
);
2640 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2648 #if (NDEBUG & NDEBUG_NO_DATAOUT)
2649 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n",
2653 cmd
->result
= DID_ERROR
<< 16;
2658 * If there is no room left in the current buffer in the
2659 * scatter-gather list, move onto the next one.
2662 if (!cmd
->SCp
.this_residual
&& cmd
->SCp
.buffers_residual
) {
2664 --cmd
->SCp
.buffers_residual
;
2665 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
2666 cmd
->SCp
.ptr
= cmd
->SCp
.buffer
->address
;
2667 #if (NDEBUG & NDEBUG_INFORMATION)
2668 printk("scsi%d : %d bytes and %d buffers left\n",
2669 instance
->host_no
, cmd
->SCp
.this_residual
,
2670 cmd
->SCp
.buffers_residual
);
2674 * The preferred transfer method is going to be
2675 * PSEUDO-DMA for systems that are strictly PIO,
2676 * since we can let the hardware do the handshaking.
2678 * For this to work, we need to know the transfersize
2679 * ahead of time, since the pseudo-DMA code will sit
2680 * in an unconditional loop.
2683 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2685 * PSEUDO_DMA is defined here. If this is the g_NCR5380
2686 * driver then it will always be defined, so the
2687 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
2688 * NCR5380 case. I think this is a fairly clean solution.
2689 * We supplement these 2 if's with the flag.
2691 #ifdef NCR5380_dma_xfer_len
2692 if (!cmd
->device
->borken
&&
2693 !(hostdata
->flags
& FLAG_NO_PSEUDO_DMA
) &&
2694 (transfersize
= NCR5380_dma_xfer_len(instance
, cmd
)) != 0) {
2696 transfersize
= cmd
->transfersize
;
2698 #ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */
2699 if (transfersize
> 512)
2701 #endif /* LIMIT_TRANSFERSIZE */
2703 if (!cmd
->device
->borken
&& transfersize
&&
2704 !(hostdata
->flags
& FLAG_NO_PSEUDO_DMA
) &&
2705 cmd
->SCp
.this_residual
&& !(cmd
->SCp
.this_residual
%
2707 /* Limit transfers to 32K, for xx400 & xx406
2708 * pseudoDMA that transfers in 128 bytes blocks. */
2709 if (transfersize
> 32 * 1024)
2710 transfersize
= 32 * 1024;
2713 if (NCR5380_transfer_dma(instance
, &phase
,
2714 &len
, (unsigned char **) &cmd
->SCp
.ptr
)) {
2716 * If the watchdog timer fires, all future accesses to this
2717 * device will use the polled-IO.
2719 printk("scsi%d : switching target %d lun %d to slow handshake\n",
2720 instance
->host_no
, cmd
->target
, cmd
->lun
);
2721 cmd
->device
->borken
= 1;
2722 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2726 cmd
->result
= DID_ERROR
<< 16;
2728 /* XXX - need to source or sink data here, as appropriate */
2730 cmd
->SCp
.this_residual
-= transfersize
- len
;
2732 #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */
2733 NCR5380_transfer_pio(instance
, &phase
,
2734 (int *) &cmd
->SCp
.this_residual
, (unsigned char **)
2740 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2741 cmd
->SCp
.Message
= tmp
;
2745 * Linking lets us reduce the time required to get the
2746 * next command out to the device, hopefully this will
2747 * mean we don't waste another revolution due to the delays
2748 * required by ARBITRATION and another SELECTION.
2750 * In the current implementation proposal, low level drivers
2751 * merely have to start the next command, pointed to by
2752 * next_link, done() is called as with unlinked commands.
2755 case LINKED_CMD_COMPLETE
:
2756 case LINKED_FLG_CMD_COMPLETE
:
2757 /* Accept message by clearing ACK */
2758 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2760 #if (NDEBUG & NDEBUG_LINKED)
2761 printk("scsi%d : target %d lun %d linked command complete.\n",
2762 instance
->host_no
, cmd
->target
, cmd
->lun
);
2765 * Sanity check : A linked command should only terminate with
2766 * one of these messages if there are more linked commands
2770 if (!cmd
->next_link
) {
2771 printk("scsi%d : target %d lun %d linked command complete, no next_link\n"
2772 instance
->host_no
, cmd
->target
, cmd
->lun
);
2777 initialize_SCp(cmd
->next_link
);
2778 /* The next command is still part of this process */
2779 cmd
->next_link
->tag
= cmd
->tag
;
2780 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
2781 #if (NDEBUG & NDEBUG_LINKED)
2782 printk("scsi%d : target %d lun %d linked request done, calling scsi_done().\n",
2783 instance
->host_no
, cmd
->target
, cmd
->lun
);
2785 #ifdef NCR5380_STATS
2786 collect_stats(hostdata
, cmd
);
2788 cmd
->scsi_done(cmd
);
2789 cmd
= hostdata
->connected
;
2791 #endif /* def LINKED */
2793 case COMMAND_COMPLETE
:
2794 /* Accept message by clearing ACK */
2796 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2797 hostdata
->connected
= NULL
;
2798 #if (NDEBUG & NDEBUG_QUEUES)
2799 printk("scsi%d : command for target %d, lun %d completed\n",
2800 instance
->host_no
, cmd
->target
, cmd
->lun
);
2802 hostdata
->busy
[cmd
->target
] &= ~(1 << cmd
->lun
);
2805 * I'm not sure what the correct thing to do here is :
2807 * If the command that just executed is NOT a request
2808 * sense, the obvious thing to do is to set the result
2809 * code to the values of the stored parameters.
2811 * If it was a REQUEST SENSE command, we need some way
2812 * to differentiate between the failure code of the original
2813 * and the failure code of the REQUEST sense - the obvious
2814 * case is success, where we fall through and leave the result
2817 * The non-obvious place is where the REQUEST SENSE failed
2820 if (cmd
->cmnd
[0] != REQUEST_SENSE
)
2821 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
2822 else if (cmd
->SCp
.Status
!= GOOD
)
2823 cmd
->result
= (cmd
->result
& 0x00ffff) | (DID_ERROR
<< 16);
2826 if ((cmd
->cmnd
[0] != REQUEST_SENSE
) &&
2827 (cmd
->SCp
.Status
== CHECK_CONDITION
)) {
2828 unsigned long flags
;
2829 #if (NDEBUG & NDEBUG_AUTOSENSE)
2830 printk("scsi%d : performing request sense\n",
2833 cmd
->cmnd
[0] = REQUEST_SENSE
;
2834 cmd
->cmnd
[1] &= 0xe0;
2837 cmd
->cmnd
[4] = sizeof(cmd
->sense_buffer
);
2840 cmd
->SCp
.buffer
= NULL
;
2841 cmd
->SCp
.buffers_residual
= 0;
2842 cmd
->SCp
.ptr
= (char *) cmd
->sense_buffer
;
2843 cmd
->SCp
.this_residual
= sizeof(cmd
->sense_buffer
);
2847 LIST(cmd
, hostdata
->issue_queue
);
2848 cmd
->host_scribble
= (unsigned char *)
2849 hostdata
->issue_queue
;
2850 hostdata
->issue_queue
= (Scsi_Cmnd
*) cmd
;
2851 restore_flags(flags
);
2852 #if (NDEBUG & NDEBUG_QUEUES)
2853 printk("scsi%d : REQUEST SENSE added to head of issue queue\n", instance
->host_no
);
2856 #endif /* def AUTOSENSE */
2857 #ifdef NCR5380_STATS
2858 collect_stats(hostdata
, cmd
);
2860 cmd
->scsi_done(cmd
);
2863 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2865 * Restore phase bits to 0 so an interrupted selection,
2866 * arbitration can resume.
2868 NCR5380_write(TARGET_COMMAND_REG
, 0);
2870 while ((NCR5380_read(STATUS_REG
) & SR_BSY
) && !hostdata
->connected
)
2873 case MESSAGE_REJECT
:
2874 /* Accept message by clearing ACK */
2875 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2876 switch (hostdata
->last_message
) {
2877 case HEAD_OF_QUEUE_TAG
:
2878 case ORDERED_QUEUE_TAG
:
2879 case SIMPLE_QUEUE_TAG
:
2880 cmd
->device
->tagged_queue
= 0;
2881 hostdata
->busy
[cmd
->target
] |= (1 << cmd
->lun
);
2887 unsigned long flags
;
2888 /* Accept message by clearing ACK */
2889 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2890 cmd
->device
->disconnect
= 1;
2893 LIST(cmd
, hostdata
->disconnected_queue
);
2894 cmd
->host_scribble
= (unsigned char *)
2895 hostdata
->disconnected_queue
;
2896 hostdata
->connected
= NULL
;
2897 hostdata
->disconnected_queue
= cmd
;
2898 restore_flags(flags
);
2899 #if (NDEBUG & NDEBUG_QUEUES)
2900 printk("scsi%d : command for target %d lun %d was moved from connected to"
2901 " the disconnected_queue\n", instance
->host_no
,
2902 cmd
->target
, cmd
->lun
);
2905 * Restore phase bits to 0 so an interrupted selection,
2906 * arbitration can resume.
2908 NCR5380_write(TARGET_COMMAND_REG
, 0);
2910 /* Enable reselect interrupts */
2911 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2912 /* Wait for bus free to avoid nasty timeouts */
2913 while ((NCR5380_read(STATUS_REG
) & SR_BSY
) && !hostdata
->connected
)
2916 NCR5380_print_status(instance
);
2921 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2922 * operation, in violation of the SCSI spec so we can safely
2923 * ignore SAVE/RESTORE pointers calls.
2925 * Unfortunately, some disks violate the SCSI spec and
2926 * don't issue the required SAVE_POINTERS message before
2927 * disconnecting, and we have to break spec to remain
2931 case RESTORE_POINTERS
:
2932 /* Accept message by clearing ACK */
2933 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2935 case EXTENDED_MESSAGE
:
2937 * Extended messages are sent in the following format :
2939 * 0 EXTENDED_MESSAGE == 1
2940 * 1 length (includes one byte for code, doesn't
2941 * include first two bytes)
2943 * 3..length+1 arguments
2945 * Start the extended message buffer with the EXTENDED_MESSAGE
2946 * byte, since print_msg() wants the whole thing.
2948 extended_msg
[0] = EXTENDED_MESSAGE
;
2949 /* Accept first byte by clearing ACK */
2950 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2952 #if (NDEBUG & NDEBUG_EXTENDED)
2953 printk("scsi%d : receiving extended message\n",
2958 data
= extended_msg
+ 1;
2959 phase
= PHASE_MSGIN
;
2960 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2962 #if (NDEBUG & NDEBUG_EXTENDED)
2963 printk("scsi%d : length=%d, code=0x%02x\n",
2964 instance
->host_no
, (int) extended_msg
[1],
2965 (int) extended_msg
[2]);
2968 if (!len
&& extended_msg
[1] <=
2969 (sizeof(extended_msg
) - 1)) {
2970 /* Accept third byte by clearing ACK */
2971 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2972 len
= extended_msg
[1] - 1;
2973 data
= extended_msg
+ 3;
2974 phase
= PHASE_MSGIN
;
2976 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2978 #if (NDEBUG & NDEBUG_EXTENDED)
2979 printk("scsi%d : message received, residual %d\n",
2980 instance
->host_no
, len
);
2983 switch (extended_msg
[2]) {
2986 case EXTENDED_MODIFY_DATA_POINTER
:
2987 case EXTENDED_EXTENDED_IDENTIFY
:
2991 printk("scsi%d: error receiving extended message\n",
2995 printk("scsi%d: extended message code %02x length %d is too long\n",
2996 instance
->host_no
, extended_msg
[2], extended_msg
[1]);
2999 /* Fall through to reject message */
3002 * If we get something weird that we aren't expecting,
3007 printk("scsi%d: rejecting message ", instance
->host_no
);
3008 print_msg(extended_msg
);
3010 } else if (tmp
!= EXTENDED_MESSAGE
)
3011 printk("scsi%d: rejecting unknown message %02x from target %d, lun %d\n",
3012 instance
->host_no
, tmp
, cmd
->target
, cmd
->lun
);
3014 printk("scsi%d: rejecting unknown extended message code %02x, length %d from target %d, lun %d\n",
3015 instance
->host_no
, extended_msg
[1], extended_msg
[0], cmd
->target
, cmd
->lun
);
3017 msgout
= MESSAGE_REJECT
;
3018 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
3021 } /* switch (tmp) */
3026 hostdata
->last_message
= msgout
;
3027 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
3028 if (msgout
== ABORT
) {
3029 hostdata
->busy
[cmd
->target
] &= ~(1 << cmd
->lun
);
3030 hostdata
->connected
= NULL
;
3031 cmd
->result
= DID_ERROR
<< 16;
3032 #ifdef NCR5380_STATS
3033 collect_stats(hostdata
, cmd
);
3035 cmd
->scsi_done(cmd
);
3036 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
3045 * XXX for performance reasons, on machines with a
3046 * PSEUDO-DMA architecture we should probably
3047 * use the dma transfer function.
3049 NCR5380_transfer_pio(instance
, &phase
, &len
,
3052 if (!cmd
->device
->disconnect
&&
3053 should_disconnect(cmd
->cmnd
[0]))
3055 hostdata
->time_expires
= jiffies
+ USLEEP_SLEEP
;
3056 #if (NDEBUG & NDEBUG_USLEEP)
3057 printk("scsi%d : issued command, sleeping until %ul\n", instance
->host_no
,
3058 hostdata
->time_expires
);
3060 NCR5380_set_timer(instance
);
3063 #endif /* def USLEEP */
3068 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
3069 cmd
->SCp
.Status
= tmp
;
3072 printk("scsi%d : unknown phase\n", instance
->host_no
);
3074 NCR5380_print(instance
);
3076 } /* switch(phase) */
3077 } /* if (tmp * SR_REQ) */
3081 /* RvC: go to sleep if polling time expired
3083 if (!cmd
->device
->disconnect
&& time_after_eq(jiffies
, poll_time
))
3085 hostdata
->time_expires
= jiffies
+ USLEEP_SLEEP
;
3086 #if (NDEBUG & NDEBUG_USLEEP)
3087 printk("scsi%d : poll timed out, sleeping until %ul\n", instance
->host_no
,
3088 hostdata
->time_expires
);
3090 NCR5380_set_timer(instance
);
3099 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
3101 * Purpose : does reselection, initializing the instance->connected
3102 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
3103 * nexus has been reestablished,
3105 * Inputs : instance - this instance of the NCR5380.
3110 static void NCR5380_reselect(struct Scsi_Host
*instance
) {
3111 NCR5380_local_declare();
3112 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*)
3114 unsigned char target_mask
;
3115 unsigned char lun
, phase
;
3120 unsigned char msg
[3];
3121 unsigned char *data
;
3122 Scsi_Cmnd
*tmp
= NULL
, *prev
;
3124 NCR5380_setup(instance
);
3127 * Disable arbitration, etc. since the host adapter obviously
3128 * lost, and tell an interrupted NCR5380_select() to restart.
3131 NCR5380_write(MODE_REG
, MR_BASE
);
3132 hostdata
->restart_select
= 1;
3134 target_mask
= NCR5380_read(CURRENT_SCSI_DATA_REG
) & ~(hostdata
->id_mask
);
3136 #if (NDEBUG & NDEBUG_RESELECTION)
3137 printk("scsi%d : reselect\n", instance
->host_no
);
3141 * At this point, we have detected that our SCSI ID is on the bus,
3142 * SEL is true and BSY was false for at least one bus settle delay
3145 * We must assert BSY ourselves, until the target drops the SEL
3149 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_BSY
);
3151 while (NCR5380_read(STATUS_REG
) & SR_SEL
);
3152 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
3155 * Wait for target to go into MSGIN.
3158 while (!(NCR5380_read(STATUS_REG
) & SR_REQ
));
3162 phase
= PHASE_MSGIN
;
3163 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
3166 if (!msg
[0] & 0x80) {
3167 printk("scsi%d : expecting IDENTIFY message, got ",
3172 /* Accept message by clearing ACK */
3173 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
3174 lun
= (msg
[0] & 0x07);
3177 * We need to add code for SCSI-II to track which devices have
3178 * I_T_L_Q nexuses established, and which have simple I_T_L
3179 * nexuses so we can chose to do additional data transfer.
3183 #error "SCSI-II tagged queueing is not supported yet"
3187 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
3188 * just reestablished, and remove it from the disconnected queue.
3192 for (tmp
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
, prev
= NULL
;
3193 tmp
; prev
= tmp
, tmp
= (Scsi_Cmnd
*) tmp
->host_scribble
)
3194 if ((target_mask
== (1 << tmp
->target
)) && (lun
== tmp
->lun
)
3196 && (tag
== tmp
->tag
)
3200 REMOVE(prev
, prev
->host_scribble
, tmp
, tmp
->host_scribble
);
3201 prev
->host_scribble
= tmp
->host_scribble
;
3203 REMOVE(-1, hostdata
->disconnected_queue
, tmp
, tmp
->host_scribble
);
3204 hostdata
->disconnected_queue
= (Scsi_Cmnd
*) tmp
->host_scribble
;
3206 tmp
->host_scribble
= NULL
;
3211 printk("scsi%d : warning : target bitmask %02x lun %d tag %d not in disconnect_queue.\n",
3212 instance
->host_no
, target_mask
, lun
, tag
);
3214 printk("scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n",
3215 instance
->host_no
, target_mask
, lun
);
3218 * Since we have an established nexus that we can't do anything with,
3228 hostdata
->connected
= tmp
;
3229 #if (NDEBUG & NDEBUG_RESELECTION)
3230 printk("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n",
3231 instance
->host_no
, tmp
->target
, tmp
->lun
, tmp
->tag
);
3237 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
3239 * Purpose : called by interrupt handler when DMA finishes or a phase
3240 * mismatch occurs (which would finish the DMA transfer).
3242 * Inputs : instance - this instance of the NCR5380.
3244 * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L
3245 * nexus has been reestablished, on failure NULL is returned.
3249 static void NCR5380_dma_complete(NCR5380_instance
* instance
) {
3250 NCR5380_local_declare();
3251 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*
3252 instance
->hostdata
);
3254 NCR5380_setup(instance
);
3257 * XXX this might not be right.
3259 * Wait for final byte to transfer, ie wait for ACK to go false.
3261 * We should use the Last Byte Sent bit, unfortunately this is
3262 * not available on the 5380/5381 (only the various CMOS chips)
3265 while (NCR5380_read(BUS_AND_STATUS_REG
) & BASR_ACK
);
3267 NCR5380_write(MODE_REG
, MR_BASE
);
3268 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
3271 * The only places we should see a phase mismatch and have to send
3272 * data from the same set of pointers will be the data transfer
3273 * phases. So, residual, requested length are only important here.
3276 if (!(hostdata
->connected
->SCp
.phase
& SR_CD
)) {
3277 transferred
= instance
->dmalen
- NCR5380_dma_residual();
3278 hostdata
->connected
->SCp
.this_residual
-= transferred
;
3279 hostdata
->connected
->SCp
.ptr
+= transferred
;
3282 #endif /* def REAL_DMA */
3285 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
3287 * Purpose : abort a command
3289 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
3290 * host byte of the result field to, if zero DID_ABORTED is
3293 * Returns : 0 - success, -1 on failure.
3295 * XXX - there is no way to abort the command that is currently
3296 * connected, you have to wait for it to complete. If this is
3297 * a problem, we could implement longjmp() / setjmp(), setjmp()
3298 * called where the loop started in NCR5380_main().
3301 #ifndef NCR5380_abort
3304 int NCR5380_abort(Scsi_Cmnd
* cmd
) {
3305 NCR5380_local_declare();
3306 unsigned long flags
;
3307 struct Scsi_Host
*instance
= cmd
->host
;
3308 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*)
3310 Scsi_Cmnd
*tmp
, **prev
;
3312 printk("scsi%d : aborting command\n", instance
->host_no
);
3313 print_Scsi_Cmnd(cmd
);
3315 NCR5380_print_status(instance
);
3317 printk("scsi%d : aborting command\n", instance
->host_no
);
3318 print_Scsi_Cmnd(cmd
);
3320 NCR5380_print_status(instance
);
3324 NCR5380_setup(instance
);
3326 #if (NDEBUG & NDEBUG_ABORT)
3327 printk("scsi%d : abort called\n", instance
->host_no
);
3328 printk(" basr 0x%X, sr 0x%X\n",
3329 NCR5380_read(BUS_AND_STATUS_REG
), NCR5380_read(STATUS_REG
));
3334 * Case 1 : If the command is the currently executing command,
3335 * we'll set the aborted flag and return control so that
3336 * information transfer routine can exit cleanly.
3339 if (hostdata
->connected
== cmd
) {
3340 #if (NDEBUG & NDEBUG_ABORT)
3341 printk("scsi%d : aborting connected command\n", instance
->host_no
);
3343 hostdata
->aborted
= 1;
3345 * We should perform BSY checking, and make sure we haven't slipped
3349 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_ASSERT_ATN
);
3351 * Since we can't change phases until we've completed the current
3352 * handshake, we have to source or sink a byte of data if the current
3353 * phase is not MSGOUT.
3357 * Return control to the executing NCR drive so we can clear the
3358 * aborted flag and get back into our main loop.
3366 * Case 2 : If the command hasn't been issued yet, we simply remove it
3367 * from the issue queue.
3369 #if (NDEBUG & NDEBUG_ABORT)
3371 printk("scsi%d : abort going into loop.\n", instance
->host_no
);
3373 for (prev
= (Scsi_Cmnd
**) & (hostdata
->issue_queue
),
3374 tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
;
3375 tmp
; prev
= (Scsi_Cmnd
**) & (tmp
->host_scribble
), tmp
=
3376 (Scsi_Cmnd
*) tmp
->host_scribble
)
3378 REMOVE(5, *prev
, tmp
, tmp
->host_scribble
);
3379 (*prev
) = (Scsi_Cmnd
*) tmp
->host_scribble
;
3380 tmp
->host_scribble
= NULL
;
3381 tmp
->result
= DID_ABORT
<< 16;
3382 restore_flags(flags
);
3383 #if (NDEBUG & NDEBUG_ABORT)
3384 printk("scsi%d : abort removed command from issue queue.\n",
3388 return SCSI_ABORT_SUCCESS
;
3390 #if (NDEBUG & NDEBUG_ABORT)
3392 else if (prev
== tmp
)
3393 printk("scsi%d : LOOP\n", instance
->host_no
);
3397 * Case 3 : If any commands are connected, we're going to fail the abort
3398 * and let the high level SCSI driver retry at a later time or
3401 * Timeouts, and therefore aborted commands, will be highly unlikely
3402 * and handling them cleanly in this situation would make the common
3403 * case of noresets less efficient, and would pollute our code. So,
3407 if (hostdata
->connected
) {
3408 restore_flags(flags
);
3409 #if (NDEBUG & NDEBUG_ABORT)
3410 printk("scsi%d : abort failed, command connected.\n", instance
->host_no
);
3412 return SCSI_ABORT_NOT_RUNNING
;
3415 * Case 4: If the command is currently disconnected from the bus, and
3416 * there are no connected commands, we reconnect the I_T_L or
3417 * I_T_L_Q nexus associated with it, go into message out, and send
3420 * This case is especially ugly. In order to reestablish the nexus, we
3421 * need to call NCR5380_select(). The easiest way to implement this
3422 * function was to abort if the bus was busy, and let the interrupt
3423 * handler triggered on the SEL for reselect take care of lost arbitrations
3424 * where necessary, meaning interrupts need to be enabled.
3426 * When interrupts are enabled, the queues may change - so we
3427 * can't remove it from the disconnected queue before selecting it
3428 * because that could cause a failure in hashing the nexus if that
3429 * device reselected.
3431 * Since the queues may change, we can't use the pointers from when we
3434 * So, we must first locate the command, and if NCR5380_select()
3435 * succeeds, then issue the abort, relocate the command and remove
3436 * it from the disconnected queue.
3439 for (tmp
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
; tmp
;
3440 tmp
= (Scsi_Cmnd
*) tmp
->host_scribble
)
3442 restore_flags(flags
);
3443 #if (NDEBUG & NDEBUG_ABORT)
3444 printk("scsi%d : aborting disconnected command.\n", instance
->host_no
);
3447 if (NCR5380_select(instance
, cmd
, (int) cmd
->tag
))
3448 return SCSI_ABORT_BUSY
;
3450 #if (NDEBUG & NDEBUG_ABORT)
3451 printk("scsi%d : nexus reestablished.\n", instance
->host_no
);
3457 for (prev
= (Scsi_Cmnd
**) & (hostdata
->disconnected_queue
),
3458 tmp
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
;
3459 tmp
; prev
= (Scsi_Cmnd
**) & (tmp
->host_scribble
), tmp
=
3460 (Scsi_Cmnd
*) tmp
->host_scribble
)
3462 REMOVE(5, *prev
, tmp
, tmp
->host_scribble
);
3463 *prev
= (Scsi_Cmnd
*) tmp
->host_scribble
;
3464 tmp
->host_scribble
= NULL
;
3465 tmp
->result
= DID_ABORT
<< 16;
3466 restore_flags(flags
);
3468 return SCSI_ABORT_SUCCESS
;
3472 * Case 5 : If we reached this point, the command was not found in any of
3475 * We probably reached this point because of an unlikely race condition
3476 * between the command completing successfully and the abortion code,
3477 * so we won't panic, but we will notify the user in case something really
3481 restore_flags(flags
);
3482 printk("scsi%d : warning : SCSI command probably completed successfully\n"
3483 " before abortion\n", instance
->host_no
);
3484 return SCSI_ABORT_NOT_RUNNING
;
3489 * Function : int NCR5380_reset (Scsi_Cmnd *cmd, unsigned int reset_flags)
3491 * Purpose : reset the SCSI bus.
3493 * Returns : SCSI_RESET_WAKEUP
3497 #ifndef NCR5380_reset
3500 int NCR5380_reset(Scsi_Cmnd
* cmd
, unsigned int dummy
) {
3501 NCR5380_local_declare();
3502 NCR5380_setup(cmd
->host
);
3504 NCR5380_print_status(cmd
->host
);
3505 do_reset(cmd
->host
);
3507 return SCSI_RESET_WAKEUP
;