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)
575 * These need tweaking, and would probably work best as per-device
576 * flags initialized differently for disk, tape, cd, etc devices.
577 * People with broken devices are free to experiment as to what gives
578 * the best results for them.
580 * USLEEP_SLEEP should be a minimum seek time.
582 * USLEEP_POLL should be a maximum rotational latency.
585 /* 20 ms (reasonable hard disk speed) */
586 #define USLEEP_SLEEP (20*HZ/1000)
588 /* 300 RPM (floppy speed) */
590 #define USLEEP_POLL (200*HZ/1000)
592 #ifndef USLEEP_WAITLONG
593 /* RvC: (reasonable time to wait on select error) */
594 #define USLEEP_WAITLONG USLEEP_SLEEP
597 static struct Scsi_Host
*expires_first
= NULL
;
600 * Function : int should_disconnect (unsigned char cmd)
602 * Purpose : decide weather a command would normally disconnect or
603 * not, since if it won't disconnect we should go to sleep.
605 * Input : cmd - opcode of SCSI command
607 * Returns : DISCONNECT_LONG if we should disconnect for a really long
608 * time (ie always, sleep, look for REQ active, sleep),
609 * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal
610 * time-to-data delay, DISCONNECT_NONE if this command would return
613 * Future sleep algorithms based on time to data can exploit
614 * something like this so they can differentiate between "normal"
615 * (ie, read, write, seek) and unusual commands (ie, * format).
617 * Note : We don't deal with commands that handle an immediate disconnect,
621 static int should_disconnect(unsigned char cmd
)
630 return DISCONNECT_TIME_TO_DATA
;
635 return DISCONNECT_LONG
;
637 return DISCONNECT_NONE
;
642 * Assumes instance->time_expires has been set in higher level code.
645 static int NCR5380_set_timer(struct Scsi_Host
*instance
)
648 struct Scsi_Host
*tmp
, **prev
;
652 if (((struct NCR5380_hostdata
*) (instance
->hostdata
))->next_timer
) {
653 restore_flags(flags
);
656 for (prev
= &expires_first
, tmp
= expires_first
; tmp
;
657 prev
= &(((struct NCR5380_hostdata
*) tmp
->hostdata
)->next_timer
),
658 tmp
= ((struct NCR5380_hostdata
*) tmp
->hostdata
)->next_timer
)
659 if (((struct NCR5380_hostdata
*)instance
->hostdata
)->time_expires
<
660 ((struct NCR5380_hostdata
*)tmp
->hostdata
)->time_expires
)
663 ((struct NCR5380_hostdata
*) instance
->hostdata
)->next_timer
= tmp
;
666 mod_timer(&usleep_timer
, ((struct NCR5380_hostdata
*) expires_first
->hostdata
)->time_expires
);
667 restore_flags(flags
);
671 /* Doing something about unwanted reentrancy here might be useful */
672 void NCR5380_timer_fn(unsigned long surplus_to_requirements
)
675 struct Scsi_Host
*instance
;
678 for (; expires_first
&&
679 time_before_eq(((struct NCR5380_hostdata
*)expires_first
->hostdata
)->time_expires
, jiffies
); )
681 instance
= ((struct NCR5380_hostdata
*) expires_first
->hostdata
)->next_timer
;
682 ((struct NCR5380_hostdata
*) expires_first
->hostdata
)->next_timer
= NULL
;
683 ((struct NCR5380_hostdata
*) expires_first
->hostdata
)->time_expires
= 0;
684 expires_first
= instance
;
687 del_timer(&usleep_timer
);
690 usleep_timer
.expires
= ((struct NCR5380_hostdata
*)expires_first
->hostdata
)->time_expires
;
691 add_timer(&usleep_timer
);
693 restore_flags(flags
);
695 spin_lock_irqsave(&io_request_lock
, flags
);
697 spin_unlock_irqrestore(&io_request_lock
, flags
);
699 #endif /* def USLEEP */
701 static inline void NCR5380_all_init(void)
705 #if (NDEBUG & NDEBUG_INIT)
706 printk("scsi : NCR5380_all_init()\n");
710 init_timer(&usleep_timer
);
711 usleep_timer
.function
= NCR5380_timer_fn
;
718 * Function : int NCR5380_probe_irq (struct Scsi_Host *instance, int possible)
720 * Purpose : autoprobe for the IRQ line used by the NCR5380.
722 * Inputs : instance - pointer to this instance of the NCR5380 driver,
723 * possible - bitmask of permissible interrupts.
725 * Returns : number of the IRQ selected, IRQ_NONE if no interrupt fired.
727 * XXX no effort is made to deal with spurious interrupts.
731 static int probe_irq __initdata
= 0;
733 static void __init
probe_intr(int irq
, void *dev_id
, struct pt_regs
*regs
)
738 static int __init
NCR5380_probe_irq(struct Scsi_Host
*instance
, int possible
)
740 NCR5380_local_declare();
741 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*)
743 unsigned long timeout
;
744 int trying_irqs
, i
, mask
;
745 NCR5380_setup(instance
);
747 for (trying_irqs
= i
= 0, mask
= 1; i
< 16; ++i
, mask
<<= 1)
748 if ((mask
& possible
) && (request_irq(i
, &probe_intr
, SA_INTERRUPT
, "NCR-probe", NULL
)
752 timeout
= jiffies
+ (250 * HZ
/ 1000);
753 probe_irq
= IRQ_NONE
;
756 * A interrupt is triggered whenever BSY = false, SEL = true
757 * and a bit set in the SELECT_ENABLE_REG is asserted on the
760 * Note that the bus is only driven when the phase control signals
761 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that
765 NCR5380_write(TARGET_COMMAND_REG
, 0);
766 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
767 NCR5380_write(OUTPUT_DATA_REG
, hostdata
->id_mask
);
768 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
|
771 while (probe_irq
== IRQ_NONE
&& time_before(jiffies
,timeout
))
774 NCR5380_write(SELECT_ENABLE_REG
, 0);
775 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
777 for (i
= 0, mask
= 1; i
< 16; ++i
, mask
<<= 1)
778 if (trying_irqs
& mask
)
783 #endif /* AUTOPROBE_IRQ */
786 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
788 * Purpose : called by probe code indicating the NCR5380 driver
789 * options that were selected.
791 * Inputs : instance, pointer to this instance. Unused.
794 static void __init
NCR5380_print_options(struct Scsi_Host
*instance
)
796 printk(" generic options"
826 printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL
, USLEEP_SLEEP
);
828 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE
);
829 if (((struct NCR5380_hostdata
*) instance
->hostdata
)->flags
& FLAG_NCR53C400
) {
830 printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE
);
835 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
837 * Purpose : print commands in the various queues, called from
838 * NCR5380_abort and NCR5380_debug to aid debugging.
840 * Inputs : instance, pointer to this instance.
843 static void NCR5380_print_status(struct Scsi_Host
*instance
)
845 static char pr_bfr
[512];
849 printk("NCR5380 : coroutine is%s running.\n",
850 main_running
? "" : "n't");
853 NCR5380_print(instance
);
854 NCR5380_print_phase(instance
);
857 len
= NCR5380_proc_info(pr_bfr
, &start
, 0, sizeof(pr_bfr
),
858 instance
->host_no
, 0);
860 printk("\n%s\n", pr_bfr
);
863 /******************************************/
865 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
867 * *buffer: I/O buffer
868 * **start: if inout == FALSE pointer into buffer where user read should start
869 * offset: current offset
870 * length: length of buffer
871 * hostno: Scsi_Host host_no
872 * inout: TRUE - user is writing; FALSE - user is reading
874 * Return the number of bytes read from or written
878 #define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0)
880 char *lprint_Scsi_Cmnd(Scsi_Cmnd
* cmd
, char *pos
, char *buffer
, int length
);
882 char *lprint_command(unsigned char *cmd
, char *pos
, char *buffer
, int len
);
884 char *lprint_opcode(int opcode
, char *pos
, char *buffer
, int length
);
886 #ifndef NCR5380_proc_info
889 int NCR5380_proc_info(
890 char *buffer
, char **start
, off_t offset
,
891 int length
, int hostno
, int inout
)
895 struct Scsi_Host
*instance
;
896 struct NCR5380_hostdata
*hostdata
;
899 for (instance
= first_instance
; instance
&&
900 instance
->host_no
!= hostno
; instance
= instance
->next
);
903 hostdata
= (struct NCR5380_hostdata
*) instance
->hostdata
;
905 if (inout
) { /* Has data been written to the file ? */
906 #ifdef DTC_PUBLIC_RELEASE
907 dtc_wmaxi
= dtc_maxi
= 0;
909 #ifdef PAS16_PUBLIC_RELEASE
910 pas_wmaxi
= pas_maxi
= 0;
912 return (-ENOSYS
); /* Currently this is a no-op */
914 SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE
);
915 if (((struct NCR5380_hostdata
*) instance
->hostdata
)->flags
& FLAG_NCR53C400
)
916 SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE
);
917 #ifdef DTC_PUBLIC_RELEASE
918 SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE
);
920 #ifdef T128_PUBLIC_RELEASE
921 SPRINTF("T128 release %d", T128_PUBLIC_RELEASE
);
923 #ifdef GENERIC_NCR5380_PUBLIC_RELEASE
924 SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE
);
926 #ifdef PAS16_PUBLIC_RELEASE
927 SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE
);
930 SPRINTF("\nBase Addr: 0x%05lX ", (long) instance
->base
);
931 SPRINTF("io_port: %04x ", (int) instance
->io_port
);
932 if (instance
->irq
== IRQ_NONE
)
933 SPRINTF("IRQ: None.\n");
935 SPRINTF("IRQ: %d.\n", instance
->irq
);
937 #ifdef DTC_PUBLIC_RELEASE
938 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n",
939 dtc_wmaxi
, dtc_maxi
);
941 #ifdef PAS16_PUBLIC_RELEASE
942 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n",
943 pas_wmaxi
, pas_maxi
);
947 SPRINTF("NCR5380 : coroutine is%s running.\n", main_running
? "" : "n't");
948 if (!hostdata
->connected
)
949 SPRINTF("scsi%d: no currently connected command\n", instance
->host_no
);
951 pos
= lprint_Scsi_Cmnd((Scsi_Cmnd
*) hostdata
->connected
,
952 pos
, buffer
, length
);
953 SPRINTF("scsi%d: issue_queue\n", instance
->host_no
);
954 for (ptr
= (Scsi_Cmnd
*) hostdata
->issue_queue
; ptr
;
955 ptr
= (Scsi_Cmnd
*) ptr
->host_scribble
)
956 pos
= lprint_Scsi_Cmnd(ptr
, pos
, buffer
, length
);
958 SPRINTF("scsi%d: disconnected_queue\n", instance
->host_no
);
959 for (ptr
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
; ptr
;
960 ptr
= (Scsi_Cmnd
*) ptr
->host_scribble
)
961 pos
= lprint_Scsi_Cmnd(ptr
, pos
, buffer
, length
);
963 restore_flags(flags
);
965 if (pos
- buffer
< offset
)
967 else if (pos
- buffer
- offset
< length
)
968 return pos
- buffer
- offset
;
973 char *lprint_Scsi_Cmnd(Scsi_Cmnd
* cmd
, char *pos
, char *buffer
, int length
)
975 SPRINTF("scsi%d : destination target %d, lun %d\n",
976 cmd
->host
->host_no
, cmd
->target
, cmd
->lun
);
977 SPRINTF(" command = ");
978 pos
= lprint_command(cmd
->cmnd
, pos
, buffer
, length
);
983 char *lprint_command(unsigned char *command
,
984 char *pos
, char *buffer
, int length
)
987 pos
= lprint_opcode(command
[0], pos
, buffer
, length
);
988 for (i
= 1, s
= COMMAND_SIZE(command
[0]); i
< s
; ++i
)
989 SPRINTF("%02x ", command
[i
]);
995 char *lprint_opcode(int opcode
, char *pos
, char *buffer
, int length
)
997 SPRINTF("%2d (0x%02x)", opcode
, opcode
);
1003 * Function : void NCR5380_init (struct Scsi_Host *instance, flags)
1005 * Purpose : initializes *instance and corresponding 5380 chip,
1006 * with flags OR'd into the initial flags value.
1008 * Inputs : instance - instantiation of the 5380 driver.
1010 * Notes : I assume that the host, hostno, and id bits have been
1011 * set correctly. I don't care about the irq and other fields.
1015 static void __init
NCR5380_init(struct Scsi_Host
*instance
, int flags
)
1017 NCR5380_local_declare();
1019 unsigned long timeout
;
1020 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*)
1024 * On NCR53C400 boards, NCR5380 registers are mapped 8 past
1029 if (flags
& FLAG_NCR53C400
)
1030 instance
->NCR5380_instance_name
+= NCR53C400_address_adjust
;
1033 NCR5380_setup(instance
);
1037 hostdata
->aborted
= 0;
1038 hostdata
->id_mask
= 1 << instance
->this_id
;
1039 for (i
= hostdata
->id_mask
; i
<= 0x80; i
<<= 1)
1040 if (i
> hostdata
->id_mask
)
1041 hostdata
->id_higher_mask
|= i
;
1042 for (i
= 0; i
< 8; ++i
)
1043 hostdata
->busy
[i
] = 0;
1045 hostdata
->dmalen
= 0;
1047 hostdata
->targets_present
= 0;
1048 hostdata
->connected
= NULL
;
1049 hostdata
->issue_queue
= NULL
;
1050 hostdata
->disconnected_queue
= NULL
;
1051 #ifdef NCR5380_STATS
1052 for (i
= 0; i
< 8; ++i
) {
1053 hostdata
->time_read
[i
] = 0;
1054 hostdata
->time_write
[i
] = 0;
1055 hostdata
->bytes_read
[i
] = 0;
1056 hostdata
->bytes_write
[i
] = 0;
1058 hostdata
->timebase
= 0;
1059 hostdata
->pendingw
= 0;
1060 hostdata
->pendingr
= 0;
1063 /* The CHECK code seems to break the 53C400. Will check it later maybe */
1064 if (flags
& FLAG_NCR53C400
)
1065 hostdata
->flags
= FLAG_HAS_LAST_BYTE_SENT
| flags
;
1067 hostdata
->flags
= FLAG_CHECK_LAST_BYTE_SENT
| flags
;
1069 if (!the_template
) {
1070 the_template
= instance
->hostt
;
1071 first_instance
= instance
;
1074 hostdata
->time_expires
= 0;
1075 hostdata
->next_timer
= NULL
;
1079 if ((instance
->cmd_per_lun
> 1) || instance
->can_queue
> 1)
1081 printk("scsi%d : WARNING : support for multiple outstanding commands enabled\n"
1082 " without AUTOSENSE option, contingent allegiance conditions may\n"
1083 " be incorrectly cleared.\n", instance
->host_no
);
1084 #endif /* def AUTOSENSE */
1086 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1087 NCR5380_write(MODE_REG
, MR_BASE
);
1088 NCR5380_write(TARGET_COMMAND_REG
, 0);
1089 NCR5380_write(SELECT_ENABLE_REG
, 0);
1092 if (hostdata
->flags
& FLAG_NCR53C400
) {
1093 NCR5380_write(C400_CONTROL_STATUS_REG
, CSR_BASE
);
1098 * Detect and correct bus wedge problems.
1100 * If the system crashed, it may have crashed in a state
1101 * where a SCSI command was still executing, and the
1102 * SCSI bus is not in a BUS FREE STATE.
1104 * If this is the case, we'll try to abort the currently
1105 * established nexus which we know nothing about, and that
1106 * failing, do a hard reset of the SCSI bus
1109 for (pass
= 1; (NCR5380_read(STATUS_REG
) & SR_BSY
) &&
1110 pass
<= 6; ++pass
) {
1115 printk("scsi%d: SCSI bus busy, waiting up to five seconds\n",
1117 timeout
= jiffies
+ 5 * HZ
;
1118 while (time_before(jiffies
,timeout
) && (NCR5380_read(STATUS_REG
) & SR_BSY
));
1121 printk("scsi%d: bus busy, attempting abort\n",
1126 printk("scsi%d: bus busy, attempting reset\n",
1131 printk("scsi%d: bus locked solid or invalid override\n",
1138 * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd,
1139 * void (*done)(Scsi_Cmnd *))
1141 * Purpose : enqueues a SCSI command
1143 * Inputs : cmd - SCSI command, done - function called on completion, with
1144 * a pointer to the command descriptor.
1149 * cmd is added to the per instance issue_queue, with minor
1150 * twiddling done to the host specific fields of cmd. If the
1151 * main coroutine is not running, it is restarted.
1155 /* Only make static if a wrapper function is used */
1156 #ifndef NCR5380_queue_command
1159 int NCR5380_queue_command(Scsi_Cmnd
* cmd
, void (*done
) (Scsi_Cmnd
*)) {
1160 struct Scsi_Host
*instance
= cmd
->host
;
1161 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*)
1165 #if (NDEBUG & NDEBUG_NO_WRITE)
1166 switch (cmd
->cmnd
[0]) {
1169 printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n",
1171 cmd
->result
= (DID_ERROR
<< 16);
1175 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
1177 #ifdef NCR5380_STATS
1179 if (!hostdata
->connected
&& !hostdata
->issue_queue
&&
1180 !hostdata
->disconnected_queue
) {
1181 hostdata
->timebase
= jiffies
;
1184 #ifdef NCR5380_STAT_LIMIT
1185 if (cmd
->request_bufflen
> NCR5380_STAT_LIMIT
)
1187 switch (cmd
->cmnd
[0]) {
1191 hostdata
->time_write
[cmd
->target
] -= (jiffies
- hostdata
->timebase
);
1192 hostdata
->bytes_write
[cmd
->target
] += cmd
->request_bufflen
;
1193 hostdata
->pendingw
++;
1198 hostdata
->time_read
[cmd
->target
] -= (jiffies
- hostdata
->timebase
);
1199 hostdata
->bytes_read
[cmd
->target
] += cmd
->request_bufflen
;
1200 hostdata
->pendingr
++;
1206 * We use the host_scribble field as a pointer to the next command
1210 cmd
->host_scribble
= NULL
;
1211 cmd
->scsi_done
= done
;
1217 * Insert the cmd into the issue queue. Note that REQUEST SENSE
1218 * commands are added to the head of the queue since any command will
1219 * clear the contingent allegiance condition that exists and the
1220 * sense data is only guaranteed to be valid while the condition exists.
1223 if (!(hostdata
->issue_queue
) || (cmd
->cmnd
[0] == REQUEST_SENSE
)) {
1224 LIST(cmd
, hostdata
->issue_queue
);
1225 cmd
->host_scribble
= (unsigned char *) hostdata
->issue_queue
;
1226 hostdata
->issue_queue
= cmd
;
1228 for (tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
; tmp
->host_scribble
;
1229 tmp
= (Scsi_Cmnd
*) tmp
->host_scribble
);
1231 tmp
->host_scribble
= (unsigned char *) cmd
;
1233 #if (NDEBUG & NDEBUG_QUEUES)
1234 printk("scsi%d : command added to %s of queue\n", instance
->host_no
,
1235 (cmd
->cmnd
[0] == REQUEST_SENSE
) ? "head" : "tail");
1238 /* Run the coroutine if it isn't already running. */
1244 * Function : NCR5380_main (void)
1246 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1247 * be done on the NCR5380 host adapters in a system. Both
1248 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1249 * in case it is not running.
1251 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
1252 * reenable them. This prevents reentrancy and kernel stack overflow.
1255 static void NCR5380_main(void) {
1256 Scsi_Cmnd
*tmp
, *prev
;
1257 struct Scsi_Host
*instance
;
1258 struct NCR5380_hostdata
*hostdata
;
1260 unsigned long flags
;
1263 * We run (with interrupts disabled) until we're sure that none of
1264 * the host adapters have anything that can be done, at which point
1265 * we set main_running to 0 and exit.
1267 * Interrupts are enabled before doing various other internal
1268 * instructions, after we've decided that we need to run through
1271 * this should prevent any race conditions.
1274 spin_unlock_irq(&io_request_lock
);
1279 cli(); /* Freeze request queues */
1281 for (instance
= first_instance
; instance
&&
1282 instance
->hostt
== the_template
; instance
= instance
->next
) {
1283 hostdata
= (struct NCR5380_hostdata
*) instance
->hostdata
;
1286 if (!hostdata
->connected
&& !hostdata
->selecting
) {
1288 if (!hostdata
->connected
) {
1290 #if (NDEBUG & NDEBUG_MAIN)
1291 printk("scsi%d : not connected\n", instance
->host_no
);
1294 * Search through the issue_queue for a command destined
1295 * for a target that's not busy.
1297 #if (NDEBUG & NDEBUG_LISTS)
1298 for (tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
, prev
= NULL
; tmp
&& (tmp
!= prev
); prev
= tmp
, tmp
= (Scsi_Cmnd
*) tmp
->host_scribble
);
1299 /*printk("%p ", tmp); */
1300 if ((tmp
== prev
) && tmp
)
1301 printk(" LOOP\n"); /* else printk("\n"); */
1303 for (tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
,
1304 prev
= NULL
; tmp
; prev
= tmp
, tmp
= (Scsi_Cmnd
*)
1305 tmp
->host_scribble
) {
1307 #if (NDEBUG & NDEBUG_LISTS)
1309 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp
, tmp
->target
, hostdata
->busy
[tmp
->target
], tmp
->lun
);
1311 /* When we find one, remove it from the issue queue. */
1312 if (!(hostdata
->busy
[tmp
->target
] & (1 << tmp
->lun
))) {
1314 REMOVE(prev
, prev
->host_scribble
, tmp
, tmp
->host_scribble
);
1315 prev
->host_scribble
= tmp
->host_scribble
;
1317 REMOVE(-1, hostdata
->issue_queue
, tmp
, tmp
->host_scribble
);
1318 hostdata
->issue_queue
= (Scsi_Cmnd
*) tmp
->host_scribble
;
1320 tmp
->host_scribble
= NULL
;
1322 /* reenable interrupts after finding one */
1323 restore_flags(flags
);
1326 * Attempt to establish an I_T_L nexus here.
1327 * On success, instance->hostdata->connected is set.
1328 * On failure, we must add the command back to the
1329 * issue queue so we can keep trying.
1331 #if (NDEBUG & (NDEBUG_MAIN | NDEBUG_QUEUES))
1332 printk("scsi%d : main() : command for target %d lun %d removed from issue_queue\n",
1333 instance
->host_no
, tmp
->target
, tmp
->lun
);
1337 * A successful selection is defined as one that
1338 * leaves us with the command connected and
1339 * in hostdata->connected, OR has terminated the
1342 * With successful commands, we fall through
1343 * and see if we can do an information transfer,
1344 * with failures we will restart.
1347 hostdata
->selecting
= 0; /* RvC: have to preset this
1348 to indicate a new command is being performed */
1351 if (!NCR5380_select(instance
, tmp
,
1353 * REQUEST SENSE commands are issued without tagged
1354 * queueing, even on SCSI-II devices because the
1355 * contingent allegiance condition exists for the
1358 (tmp
->cmnd
[0] == REQUEST_SENSE
) ? TAG_NONE
:
1363 LIST(tmp
, hostdata
->issue_queue
);
1364 tmp
->host_scribble
= (unsigned char *)
1365 hostdata
->issue_queue
;
1366 hostdata
->issue_queue
= tmp
;
1368 restore_flags(flags
);
1369 #if (NDEBUG & (NDEBUG_MAIN | NDEBUG_QUEUES))
1370 printk("scsi%d : main(): select() failed, returned to issue_queue\n",
1374 } /* if target/lun is not busy */
1376 } /* if (!hostdata->connected) */
1378 if (hostdata
->selecting
)
1380 tmp
= (Scsi_Cmnd
*)hostdata
->selecting
;
1381 if (!NCR5380_select(instance
, tmp
,
1382 (tmp
->cmnd
[0] == REQUEST_SENSE
) ? TAG_NONE
: TAG_NEXT
))
1388 /* RvC: device failed, so we wait a long time
1389 this is needed for Mustek scanners, that
1390 do not respond to commands immediately
1392 printk(KERN_DEBUG
"scsi%d: device %d did not respond in time\n",
1393 instance
->host_no
, tmp
->target
);
1395 LIST(tmp
, hostdata
->issue_queue
);
1396 tmp
->host_scribble
= (unsigned char *) hostdata
->issue_queue
;
1397 hostdata
->issue_queue
= tmp
;
1398 restore_flags(flags
);
1400 hostdata
->time_expires
= jiffies
+ USLEEP_WAITLONG
;
1401 NCR5380_set_timer (instance
);
1403 } /* if hostdata->selecting */
1405 if (hostdata
->connected
1407 && !hostdata
->dmalen
1410 && (!hostdata
->time_expires
|| time_before_eq(hostdata
->time_expires
, jiffies
))
1413 restore_flags(flags
);
1414 #if (NDEBUG & NDEBUG_MAIN)
1415 printk("scsi%d : main() : performing information transfer\n",
1418 NCR5380_information_transfer(instance
);
1419 #if (NDEBUG & NDEBUG_MAIN)
1420 printk("scsi%d : main() : done set false\n", instance
->host_no
);
1425 } /* for instance */
1427 spin_lock_irq(&io_request_lock
);
1432 #ifndef DONT_USE_INTR
1433 #include <linux/blk.h>
1434 #include <linux/spinlock.h>
1437 * Function : void NCR5380_intr (int irq)
1439 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1440 * from the disconnected queue, and restarting NCR5380_main()
1443 * Inputs : int irq, irq that caused this interrupt.
1447 static void NCR5380_intr(int irq
, void *dev_id
, struct pt_regs
*regs
) {
1448 NCR5380_local_declare();
1449 struct Scsi_Host
*instance
;
1452 unsigned long flags
;
1456 #if (NDEBUG & NDEBUG_INTR)
1457 printk("scsi : NCR5380 irq %d triggered\n", irq
);
1461 for (instance
= first_instance
; instance
&& (instance
->hostt
==
1462 the_template
); instance
= instance
->next
)
1463 if (instance
->irq
== irq
) {
1465 /* Look for pending interrupts */
1466 NCR5380_setup(instance
);
1467 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
1468 /* XXX dispatch to appropriate routine if found and done=0 */
1469 if (basr
& BASR_IRQ
) {
1470 #if (NDEBUG & NDEBUG_INTR)
1471 NCR5380_print(instance
);
1473 if ((NCR5380_read(STATUS_REG
) & (SR_SEL
| SR_IO
)) ==
1476 restore_flags(flags
);
1477 #if (NDEBUG & NDEBUG_INTR)
1478 printk("scsi%d : SEL interrupt\n", instance
->host_no
);
1480 NCR5380_reselect(instance
);
1481 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1482 } else if (basr
& BASR_PARITY_ERROR
) {
1483 #if (NDEBUG & NDEBUG_INTR)
1484 printk("scsi%d : PARITY interrupt\n", instance
->host_no
);
1486 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1487 } else if ((NCR5380_read(STATUS_REG
) & SR_RST
) == SR_RST
) {
1488 #if (NDEBUG & NDEBUG_INTR)
1489 printk("scsi%d : RESET interrupt\n", instance
->host_no
);
1491 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1494 * XXX the rest of the interrupt conditions should *only* occur during a
1495 * DMA transfer, which I haven't gotten around to fixing yet.
1498 #if defined(REAL_DMA)
1500 * We should only get PHASE MISMATCH and EOP interrupts
1501 * if we have DMA enabled, so do a sanity check based on
1502 * the current setting of the MODE register.
1505 if ((NCR5380_read(MODE_REG
) & MR_DMA
) && ((basr
&
1506 BASR_END_DMA_TRANSFER
) ||
1507 !(basr
& BASR_PHASE_MATCH
))) {
1510 if (!hostdata
->connected
)
1511 panic("scsi%d : received end of DMA interrupt with no connected cmd\n",
1514 transfered
= (hostdata
->dmalen
- NCR5380_dma_residual(instance
));
1515 hostdata
->connected
->SCp
.this_residual
-= transferred
;
1516 hostdata
->connected
->SCp
.ptr
+= transferred
;
1517 hostdata
->dmalen
= 0;
1519 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1522 unsigned long timeout
= jiffies
+ NCR_TIMEOUT
;
1524 spin_unlock_irq(&io_request_lock
);
1525 while (NCR5380_read(BUS_AND_STATUS_REG
) & BASR_ACK
1526 && time_before(jiffies
, timeout
));
1527 spin_lock_irq(&io_request_lock
);
1529 if (time_after_eq(jiffies
, timeout
) )
1530 printk("scsi%d: timeout at NCR5380.c:%d\n",
1531 host
->host_no
, __LINE__
);
1533 #else /* NCR_TIMEOUT */
1534 while (NCR5380_read(BUS_AND_STATUS_REG
) & BASR_ACK
);
1537 NCR5380_write(MODE_REG
, MR_BASE
);
1538 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1541 #if (NDEBUG & NDEBUG_INTR)
1542 printk("scsi : unknown interrupt, BASR 0x%X, MR 0x%X, SR 0x%x\n", basr
, NCR5380_read(MODE_REG
), NCR5380_read(STATUS_REG
));
1544 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1550 } /* if (instance->irq == irq) */
1555 static void do_NCR5380_intr(int irq
, void *dev_id
, struct pt_regs
*regs
) {
1556 unsigned long flags
;
1558 spin_lock_irqsave(&io_request_lock
, flags
);
1559 NCR5380_intr(irq
, dev_id
, regs
);
1560 spin_unlock_irqrestore(&io_request_lock
, flags
);
1565 #ifdef NCR5380_STATS
1566 static void collect_stats(struct NCR5380_hostdata
*hostdata
, Scsi_Cmnd
* cmd
) {
1567 #ifdef NCR5380_STAT_LIMIT
1568 if (cmd
->request_bufflen
> NCR5380_STAT_LIMIT
)
1570 switch (cmd
->cmnd
[0]) {
1574 hostdata
->time_write
[cmd
->target
] += (jiffies
- hostdata
->timebase
);
1575 /*hostdata->bytes_write[cmd->target] += cmd->request_bufflen; */
1576 hostdata
->pendingw
--;
1581 hostdata
->time_read
[cmd
->target
] += (jiffies
- hostdata
->timebase
);
1582 /*hostdata->bytes_read[cmd->target] += cmd->request_bufflen; */
1583 hostdata
->pendingr
--;
1589 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
1592 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1593 * including ARBITRATION, SELECTION, and initial message out for
1594 * IDENTIFY and queue messages.
1596 * Inputs : instance - instantiation of the 5380 driver on which this
1597 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1598 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1599 * the command that is presently connected.
1601 * Returns : -1 if selection could not execute for some reason,
1602 * 0 if selection succeeded or failed because the target
1606 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1607 * with registers as they should have been on entry - ie
1608 * SELECT_ENABLE will be set appropriately, the NCR5380
1609 * will cease to drive any SCSI bus signals.
1611 * If successful : I_T_L or I_T_L_Q nexus will be established,
1612 * instance->connected will be set to cmd.
1613 * SELECT interrupt will be disabled.
1615 * If failed (no target) : cmd->scsi_done() will be called, and the
1616 * cmd->result host byte set to DID_BAD_TARGET.
1618 static int NCR5380_select(struct Scsi_Host
*instance
, Scsi_Cmnd
* cmd
, int tag
) {
1619 NCR5380_local_declare();
1620 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*) instance
->hostdata
;
1621 unsigned char tmp
[3], phase
;
1622 unsigned char *data
;
1624 unsigned long timeout
;
1625 unsigned long flags
;
1627 unsigned char value
;
1630 NCR5380_setup(instance
);
1634 if (hostdata
->selecting
)
1636 goto part2
; /* RvC: sorry prof. Dijkstra, but it keeps the
1637 rest of the code nearly the same */
1641 hostdata
->restart_select
= 0;
1642 #if defined (NDEBUG) && (NDEBUG & NDEBUG_ARBITRATION)
1643 NCR5380_print(instance
);
1644 printk("scsi%d : starting arbitration, id = %d\n", instance
->host_no
,
1651 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1652 * data bus during SELECTION.
1655 NCR5380_write(TARGET_COMMAND_REG
, 0);
1659 * Start arbitration.
1662 NCR5380_write(OUTPUT_DATA_REG
, hostdata
->id_mask
);
1663 NCR5380_write(MODE_REG
, MR_ARBITRATE
);
1665 restore_flags(flags
);
1667 /* Wait for arbitration logic to complete */
1670 unsigned long timeout
= jiffies
+ 2 * NCR_TIMEOUT
;
1672 spin_unlock_irq(&io_request_lock
);
1674 while (!(NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_PROGRESS
)
1675 && time_before(jiffies
,timeout
));
1677 spin_lock_irq(&io_request_lock
);
1679 if (time_after_eq(jiffies
,timeout
)) {
1680 printk("scsi: arbitration timeout at %d\n", __LINE__
);
1681 NCR5380_write(MODE_REG
, MR_BASE
);
1682 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1686 #else /* NCR_TIMEOUT */
1687 while (!(NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_PROGRESS
));
1690 #if (NDEBUG & NDEBUG_ARBITRATION)
1691 printk("scsi%d : arbitration complete\n", instance
->host_no
);
1692 /* Avoid GCC 2.4.5 asm needs to many reloads error */
1697 * The arbitration delay is 2.2us, but this is a minimum and there is
1698 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1699 * the integral nature of udelay().
1705 /* Check for lost arbitration */
1706 if ((NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1707 (NCR5380_read(CURRENT_SCSI_DATA_REG
) & hostdata
->id_higher_mask
) ||
1708 (NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
)) {
1709 NCR5380_write(MODE_REG
, MR_BASE
);
1710 #if (NDEBUG & NDEBUG_ARBITRATION)
1711 printk("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n",
1716 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_SEL
);
1718 if (!(hostdata
->flags
& FLAG_DTC3181E
) &&
1719 /* RvC: DTC3181E has some trouble with this
1720 * so we simply removed it. Seems to work with
1721 * only Mustek scanner attached
1723 (NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
))
1725 NCR5380_write(MODE_REG
, MR_BASE
);
1726 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1727 #if (NDEBUG & NDEBUG_ARBITRATION)
1728 printk("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n",
1734 * Again, bus clear + bus settle time is 1.2us, however, this is
1735 * a minimum so we'll udelay ceil(1.2)
1740 #if (NDEBUG & NDEBUG_ARBITRATION)
1741 printk("scsi%d : won arbitration\n", instance
->host_no
);
1746 * Now that we have won arbitration, start Selection process, asserting
1747 * the host and target ID's on the SCSI bus.
1750 NCR5380_write(OUTPUT_DATA_REG
, (hostdata
->id_mask
| (1 << cmd
->target
)));
1753 * Raise ATN while SEL is true before BSY goes false from arbitration,
1754 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1755 * phase immediately after selection.
1758 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_BSY
|
1759 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1760 NCR5380_write(MODE_REG
, MR_BASE
);
1763 * Reselect interrupts must be turned off prior to the dropping of BSY,
1764 * otherwise we will trigger an interrupt.
1766 NCR5380_write(SELECT_ENABLE_REG
, 0);
1769 * The initiator shall then wait at least two deskew delays and release
1772 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1775 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_DATA
|
1776 ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1779 * Something weird happens when we cease to drive BSY - looks
1780 * like the board/chip is letting us do another read before the
1781 * appropriate propagation delay has expired, and we're confusing
1782 * a BSY signal from ourselves as the target's response to SELECTION.
1784 * A small delay (the 'C++' frontend breaks the pipeline with an
1785 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1786 * tighter 'C' code breaks and requires this) solves the problem -
1787 * the 1 us delay is arbitrary, and only used because this delay will
1788 * be the same on other platforms and since it works here, it should
1791 * wingel suggests that this could be due to failing to wait
1797 #if (NDEBUG & NDEBUG_SELECTION)
1798 printk("scsi%d : selecting target %d\n", instance
->host_no
, cmd
->target
);
1802 * The SCSI specification calls for a 250 ms timeout for the actual
1806 timeout
= jiffies
+ (250 * HZ
/ 1000);
1809 * XXX very interesting - we're seeing a bounce where the BSY we
1810 * asserted is being reflected / still asserted (propagation delay?)
1811 * and it's detecting as true. Sigh.
1815 hostdata
->select_time
= 0; /* we count the clock ticks at which we polled */
1816 hostdata
->selecting
= cmd
;
1819 /* RvC: here we enter after a sleeping period, or immediately after
1821 we poll only once ech clock tick */
1822 value
= NCR5380_read(STATUS_REG
) & (SR_BSY
| SR_IO
);
1824 if (!value
&& (hostdata
->select_time
< 25))
1826 /* RvC: we still must wait for a device response */
1827 hostdata
->select_time
++; /* after 25 ticks the device has failed */
1828 hostdata
->time_expires
= jiffies
+ 1;
1829 NCR5380_set_timer(instance
);
1830 return 0; /* RvC: we return here with hostdata->selecting set,
1834 hostdata
->selecting
= 0; /* clear this pointer, because we passed the
1837 spin_unlock_irq(&io_request_lock
);
1838 while (time_before(jiffies
, timeout
) && !(NCR5380_read(STATUS_REG
) &
1840 spin_lock_irq(&io_request_lock
);
1842 if ((NCR5380_read(STATUS_REG
) & (SR_SEL
| SR_IO
)) ==
1844 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1845 NCR5380_reselect(instance
);
1846 printk("scsi%d : reselection after won arbitration?\n",
1848 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1852 * No less than two deskew delays after the initiator detects the
1853 * BSY signal is true, it shall release the SEL signal and may
1854 * change the DATA BUS. -wingel
1859 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1861 if (!(NCR5380_read(STATUS_REG
) & SR_BSY
)) {
1862 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1863 if (hostdata
->targets_present
& (1 << cmd
->target
)) {
1864 printk("scsi%d : weirdness\n", instance
->host_no
);
1865 if (hostdata
->restart_select
)
1866 printk("\trestart select\n");
1867 #if (NDEBUG & NDEBUG_SELECTION)
1868 NCR5380_print(instance
);
1870 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1873 cmd
->result
= DID_BAD_TARGET
<< 16;
1874 #ifdef NCR5380_STATS
1875 collect_stats(hostdata
, cmd
);
1877 cmd
->scsi_done(cmd
);
1878 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1879 #if (NDEBUG & NDEBUG_SELECTION)
1880 printk("scsi%d : target did not respond within 250ms\n",
1883 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1886 hostdata
->targets_present
|= (1 << cmd
->target
);
1889 * Since we followed the SCSI spec, and raised ATN while SEL
1890 * was true but before BSY was false during selection, the information
1891 * transfer phase should be a MESSAGE OUT phase so that we can send the
1894 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1895 * message (2 bytes) with a tag ID that we increment with every command
1896 * until it wraps back to 0.
1898 * XXX - it turns out that there are some broken SCSI-II devices,
1899 * which claim to support tagged queuing but fail when more than
1900 * some number of commands are issued at once.
1903 /* Wait for start of REQ/ACK handshake */
1906 unsigned long timeout
= jiffies
+ NCR_TIMEOUT
;
1908 spin_unlock_irq(&io_request_lock
);
1909 while (!(NCR5380_read(STATUS_REG
) & SR_REQ
) && time_before(jiffies
, timeout
));
1910 spin_lock_irq(&io_request_lock
);
1912 if (time_after_eq(jiffies
, timeout
)) {
1913 printk("scsi%d: timeout at NCR5380.c:%d\n", instance
->host_no
, __LINE__
);
1914 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1918 #else /* NCR_TIMEOUT */
1919 while (!(NCR5380_read(STATUS_REG
) & SR_REQ
));
1920 #endif /* def NCR_TIMEOUT */
1922 #if (NDEBUG & NDEBUG_SELECTION)
1923 printk("scsi%d : target %d selected, going into MESSAGE OUT phase.\n",
1924 instance
->host_no
, cmd
->target
);
1926 tmp
[0] = IDENTIFY(((instance
->irq
== IRQ_NONE
) ? 0 : 1), cmd
->lun
);
1928 if (cmd
->device
->tagged_queue
&& (tag
!= TAG_NONE
)) {
1929 tmp
[1] = SIMPLE_QUEUE_TAG
;
1930 if (tag
== TAG_NEXT
) {
1931 /* 0 is TAG_NONE, used to imply no tag for this command */
1932 if (cmd
->device
->current_tag
== 0)
1933 cmd
->device
->current_tag
= 1;
1935 cmd
->tag
= cmd
->device
->current_tag
;
1936 cmd
->device
->current_tag
++;
1938 cmd
->tag
= (unsigned char) tag
;
1941 hostdata
->last_message
= SIMPLE_QUEUE_TAG
;
1944 #endif /* def SCSI2 */
1950 /* Send message(s) */
1952 phase
= PHASE_MSGOUT
;
1953 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
1954 #if (NDEBUG & NDEBUG_SELECTION)
1955 printk("scsi%d : nexus established.\n", instance
->host_no
);
1957 /* XXX need to handle errors here */
1958 hostdata
->connected
= cmd
;
1960 if (!cmd
->device
->tagged_queue
)
1962 hostdata
->busy
[cmd
->target
] |= (1 << cmd
->lun
);
1964 initialize_SCp(cmd
);
1971 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1972 * unsigned char *phase, int *count, unsigned char **data)
1974 * Purpose : transfers data in given phase using polled I/O
1976 * Inputs : instance - instance of driver, *phase - pointer to
1977 * what phase is expected, *count - pointer to number of
1978 * bytes to transfer, **data - pointer to data pointer.
1980 * Returns : -1 when different phase is entered without transferring
1981 * maximum number of bytes, 0 if all bytes or transfered or exit
1984 * Also, *phase, *count, *data are modified in place.
1986 * XXX Note : handling for bus free may be useful.
1990 * Note : this code is not as quick as it could be, however it
1991 * IS 100% reliable, and for the actual data transfer where speed
1992 * counts, we will always do a pseudo DMA or DMA transfer.
1995 static int NCR5380_transfer_pio(struct Scsi_Host
*instance
,
1996 unsigned char *phase
, int *count
, unsigned char **data
) {
1997 NCR5380_local_declare();
1998 register unsigned char p
= *phase
, tmp
;
1999 register int c
= *count
;
2000 register unsigned char *d
= *data
;
2003 * RvC: some administrative data to process polling time
2005 int break_allowed
= 0;
2006 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*) instance
->hostdata
;
2008 NCR5380_setup(instance
);
2010 #if (NDEBUG & NDEBUG_PIO)
2012 printk("scsi%d : pio write %d bytes\n", instance
->host_no
, c
);
2014 printk("scsi%d : pio read %d bytes\n", instance
->host_no
, c
);
2018 * The NCR5380 chip will only drive the SCSI bus when the
2019 * phase specified in the appropriate bits of the TARGET COMMAND
2020 * REGISTER match the STATUS REGISTER
2023 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
2026 /* RvC: don't know if this is necessary, but other SCSI I/O is short
2027 * so breaks are not necessary there
2029 if ((p
== PHASE_DATAIN
) || (p
== PHASE_DATAOUT
))
2038 * Wait for assertion of REQ, after which the phase bits will be
2043 /* RvC: we simply poll once, after that we stop temporarily
2044 * and let the device buffer fill up
2045 * if breaking is not allowed, we keep polling as long as needed
2048 while ( !((tmp
= NCR5380_read(STATUS_REG
)) & SR_REQ
) &&
2050 if (!(tmp
& SR_REQ
))
2052 /* timeout condition */
2053 hostdata
->time_expires
= jiffies
+ USLEEP_SLEEP
;
2054 NCR5380_set_timer (instance
);
2058 while ( !((tmp
= NCR5380_read(STATUS_REG
)) & SR_REQ
) );
2061 #if (NDEBUG & NDEBUG_HANDSHAKE)
2062 printk("scsi%d : REQ detected\n", instance
->host_no
);
2065 /* Check for phase mismatch */
2066 if ((tmp
& PHASE_MASK
) != p
) {
2067 #if (NDEBUG & NDEBUG_PIO)
2068 printk("scsi%d : phase mismatch\n", instance
->host_no
);
2069 NCR5380_print_phase(instance
);
2073 /* Do actual transfer from SCSI bus to / from memory */ if (!(p
& SR_IO
))
2074 NCR5380_write(OUTPUT_DATA_REG
, *d
);
2076 *d
= NCR5380_read(CURRENT_SCSI_DATA_REG
);
2081 * The SCSI standard suggests that in MSGOUT phase, the initiator
2082 * should drop ATN on the last byte of the message phase
2083 * after REQ has been asserted for the handshake but before
2084 * the initiator raises ACK.
2088 if (!((p
& SR_MSG
) && c
> 1)) {
2089 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2091 #if (NDEBUG & NDEBUG_PIO)
2092 NCR5380_print(instance
);
2094 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2095 ICR_ASSERT_DATA
| ICR_ASSERT_ACK
);
2097 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2098 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
);
2099 #if (NDEBUG & NDEBUG_PIO)
2100 NCR5380_print(instance
);
2102 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2103 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_ACK
);
2106 #if (NDEBUG & NDEBUG_PIO)
2107 NCR5380_print(instance
);
2109 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ACK
);
2112 while (NCR5380_read(STATUS_REG
) & SR_REQ
);
2114 #if (NDEBUG & NDEBUG_HANDSHAKE)
2115 printk("scsi%d : req false, handshake complete\n", instance
->host_no
);
2119 * We have several special cases to consider during REQ/ACK handshaking :
2120 * 1. We were in MSGOUT phase, and we are on the last byte of the
2121 * message. ATN must be dropped as ACK is dropped.
2123 * 2. We are in a MSGIN phase, and we are on the last byte of the
2124 * message. We must exit with ACK asserted, so that the calling
2125 * code may raise ATN before dropping ACK to reject the message.
2127 * 3. ACK and ATN are clear and the target may proceed as normal.
2129 if (!(p
== PHASE_MSGIN
&& c
== 1)) {
2130 if (p
== PHASE_MSGOUT
&& c
> 1)
2131 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
2133 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2137 #if (NDEBUG & NDEBUG_PIO)
2138 printk("scsi%d : residual %d\n", instance
->host_no
, c
);
2143 tmp
= NCR5380_read(STATUS_REG
);
2145 *phase
= tmp
& PHASE_MASK
;
2147 *phase
= PHASE_UNKNOWN
;
2149 if (!c
|| (*phase
== p
))
2155 static void do_reset(struct Scsi_Host
*host
) {
2156 unsigned long flags
;
2157 NCR5380_local_declare();
2158 NCR5380_setup(host
);
2162 NCR5380_write(TARGET_COMMAND_REG
,
2163 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG
) & PHASE_MASK
));
2164 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_RST
);
2166 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2167 restore_flags(flags
);
2170 * Function : do_abort (Scsi_Host *host)
2172 * Purpose : abort the currently established nexus. Should only be
2173 * called from a routine which can drop into a
2175 * Returns : 0 on success, -1 on failure.
2176 */ static int do_abort(struct Scsi_Host
*host
) {
2177 NCR5380_local_declare();
2178 unsigned char tmp
, *msgptr
, phase
;
2180 NCR5380_setup(host
);
2183 /* Request message out phase */
2184 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
2187 * Wait for the target to indicate a valid phase by asserting
2188 * REQ. Once this happens, we'll have either a MSGOUT phase
2189 * and can immediately send the ABORT message, or we'll have some
2190 * other phase and will have to source/sink data.
2192 * We really don't care what value was on the bus or what value
2193 * the target sees, so we just handshake.
2196 while (!(tmp
= NCR5380_read(STATUS_REG
)) & SR_REQ
);
2198 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
2200 if ((tmp
& PHASE_MASK
) != PHASE_MSGOUT
) {
2201 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
|
2203 while (NCR5380_read(STATUS_REG
) & SR_REQ
);
2204 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
2209 phase
= PHASE_MSGOUT
;
2210 NCR5380_transfer_pio(host
, &phase
, &len
, &msgptr
);
2213 * If we got here, and the command completed successfully,
2214 * we're about to go into bus free state.
2217 return len
? -1 : 0;
2220 #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL)
2222 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
2223 * unsigned char *phase, int *count, unsigned char **data)
2225 * Purpose : transfers data in given phase using either real
2228 * Inputs : instance - instance of driver, *phase - pointer to
2229 * what phase is expected, *count - pointer to number of
2230 * bytes to transfer, **data - pointer to data pointer.
2232 * Returns : -1 when different phase is entered without transferring
2233 * maximum number of bytes, 0 if all bytes or transfered or exit
2236 * Also, *phase, *count, *data are modified in place.
2241 static int NCR5380_transfer_dma(struct Scsi_Host
*instance
,
2242 unsigned char *phase
, int *count
, unsigned char **data
) {
2243 NCR5380_local_declare();
2244 register int c
= *count
;
2245 register unsigned char p
= *phase
;
2246 register unsigned char *d
= *data
;
2248 #if defined(PSEUDO_DMA) && !defined(UNSAFE)
2249 unsigned long flags
;
2252 #if defined(REAL_DMA_POLL)
2254 unsigned char saved_data
= 0, overrun
= 0, residue
;
2257 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*)
2260 NCR5380_setup(instance
);
2262 if ((tmp
= (NCR5380_read(STATUS_REG
) & PHASE_MASK
)) != p
) {
2266 #if defined(REAL_DMA) || defined(REAL_DMA_POLL)
2267 #ifdef READ_OVERRUNS if (p & SR_IO) { c -= 2;
2270 #if (NDEBUG & NDEBUG_DMA)
2271 printk("scsi%d : initializing DMA channel %d for %s, %d bytes %s %0x\n",
2272 instance
->host_no
, instance
->dma_channel
, (p
& SR_IO
) ? "reading" :
2273 "writing", c
, (p
& SR_IO
) ? "to" : "from", (unsigned) d
);
2275 hostdata
->dma_len
= (p
& SR_IO
) ?
2276 NCR5380_dma_read_setup(instance
, d
, c
) :
2277 NCR5380_dma_write_setup(instance
, d
, c
);
2280 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
2283 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
| MR_ENABLE_EOP_INTR
| MR_MONITOR_BSY
);
2284 #elif defined(REAL_DMA_POLL)
2285 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
);
2288 * Note : on my sample board, watch-dog timeouts occurred when interrupts
2289 * were not disabled for the duration of a single DMA transfer, from
2290 * before the setting of DMA mode to after transfer of the last byte.
2293 #if defined(PSEUDO_DMA) && !defined(UNSAFE)
2297 /* KLL May need eop and parity in 53c400 */
2298 if (hostdata
->flags
& FLAG_NCR53C400
)
2299 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
| MR_ENABLE_PAR_CHECK
2300 | MR_ENABLE_PAR_INTR
| MR_ENABLE_EOP_INTR
| MR_DMA_MODE
2303 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
);
2304 #endif /* def REAL_DMA */
2306 #if (NDEBUG & NDEBUG_DMA) & 0
2307 printk("scsi%d : mode reg = 0x%X\n", instance
->host_no
, NCR5380_read(MODE_REG
));
2311 * FOO stuff. For some UNAPPARENT reason, I'm getting
2312 * watchdog timers fired on bootup for NO APPARENT REASON, meaning it's
2313 * probably a timing problem.
2315 * Since this is the only place I have back-to-back writes, perhaps this
2324 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG
, 0);
2329 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
);
2333 NCR5380_write(START_DMA_SEND_REG
, 0);
2339 #if defined(REAL_DMA_POLL)
2341 tmp
= NCR5380_read(BUS_AND_STATUS_REG
);
2342 } while ((tmp
& BASR_PHASE_MATCH
) && !(tmp
& (BASR_BUSY_ERROR
|
2344 BASR_END_DMA_TRANSFER
)));
2347 At this point, either we've completed DMA, or we have a phase mismatch,
2348 or we've unexpectedly lost BUSY (which is a real error).
2350 For write DMAs, we want to wait until the last byte has been
2351 transferred out over the bus before we turn off DMA mode. Alas, there
2352 seems to be no terribly good way of doing this on a 5380 under all
2353 conditions. For non-scatter-gather operations, we can wait until REQ
2354 and ACK both go false, or until a phase mismatch occurs. Gather-writes
2355 are nastier, since the device will be expecting more data than we
2356 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
2357 could test LAST BIT SENT to assure transfer (I imagine this is precisely
2358 why this signal was added to the newer chips) but on the older 538[01]
2359 this signal does not exist. The workaround for this lack is a watchdog;
2360 we bail out of the wait-loop after a modest amount of wait-time if
2361 the usual exit conditions are not met. Not a terribly clean or
2362 correct solution :-%
2364 Reads are equally tricky due to a nasty characteristic of the NCR5380.
2365 If the chip is in DMA mode for an READ, it will respond to a target's
2366 REQ by latching the SCSI data into the INPUT DATA register and asserting
2367 ACK, even if it has _already_ been notified by the DMA controller that
2368 the current DMA transfer has completed! If the NCR5380 is then taken
2369 out of DMA mode, this already-acknowledged byte is lost.
2371 This is not a problem for "one DMA transfer per command" reads, because
2372 the situation will never arise... either all of the data is DMA'ed
2373 properly, or the target switches to MESSAGE IN phase to signal a
2374 disconnection (either operation bringing the DMA to a clean halt).
2375 However, in order to handle scatter-reads, we must work around the
2376 problem. The chosen fix is to DMA N-2 bytes, then check for the
2377 condition before taking the NCR5380 out of DMA mode. One or two extra
2378 bytes are transferred via PIO as necessary to fill out the original
2383 #ifdef READ_OVERRUNS
2385 if (((NCR5380_read(BUS_AND_STATUS_REG
) & (BASR_PHASE_MATCH
| BASR_ACK
)) ==
2386 (BASR_PHASE_MATCH
| BASR_ACK
))) {
2387 saved_data
= NCR5380_read(INPUT_DATA_REGISTER
);
2393 while (((tmp
= NCR5380_read(BUS_AND_STATUS_REG
)) & BASR_ACK
) ||
2394 (NCR5380_read(STATUS_REG
) & SR_REQ
)) {
2395 if (!(tmp
& BASR_PHASE_MATCH
))
2403 #if (NDEBUG & NDEBUG_DMA)
2404 printk("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n",
2405 instance
->host_no
, tmp
, NCR5380_read(STATUS_REG
));
2408 NCR5380_write(MODE_REG
, MR_BASE
);
2409 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2411 residue
= NCR5380_dma_residual(instance
);
2415 *phase
= NCR5380_read(STATUS_REG
) & PHASE_MASK
;
2417 #ifdef READ_OVERRUNS
2418 if (*phase
== p
&& (p
& SR_IO
) && residue
== 0)
2421 #if (NDEBUG & NDEBUG_DMA)
2422 printk("Got an input overrun, using saved byte\n");
2424 **data
= saved_data
;
2429 printk("No overrun??\n");
2432 #if (NDEBUG & NDEBUG_DMA)
2433 printk("Doing %d-byte PIO to 0x%X\n", cnt
, *data
);
2435 NCR5380_transfer_pio(instance
, phase
, &cnt
, data
);
2436 *count
-= toPIO
- cnt
;
2440 #if (NDEBUG & NDEBUG_DMA)
2441 printk("Return with data ptr = 0x%X, count %d, last 0x%X, next 0x%X\n",
2442 *data
, *count
, *(*data
+ *count
- 1), *(*data
+ *count
));
2446 #elif defined(REAL_DMA)
2448 #else /* defined(REAL_DMA_POLL) */
2450 #ifdef DMA_WORKS_RIGHT
2451 foo
= NCR5380_pread(instance
, d
, c
);
2454 if (hostdata
->flags
& FLAG_NCR53C400
) {
2457 if (!(foo
= NCR5380_pread(instance
, d
, c
- diff
))) {
2459 * We can't disable DMA mode after successfully transferring
2460 * what we plan to be the last byte, since that would open up
2461 * a race condition where if the target asserted REQ before
2462 * we got the DMA mode reset, the NCR5380 would have latched
2463 * an additional byte into the INPUT DATA register and we'd
2466 * The workaround was to transfer one fewer bytes than we
2467 * intended to with the pseudo-DMA read function, wait for
2468 * the chip to latch the last byte, read it, and then disable
2471 * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
2472 * REQ is deasserted when ACK is asserted, and not reasserted
2473 * until ACK goes false. Since the NCR5380 won't lower ACK
2474 * until DACK is asserted, which won't happen unless we twiddle
2475 * the DMA port or we take the NCR5380 out of DMA mode, we
2476 * can guarantee that we won't handshake another extra
2480 if (!(hostdata
->flags
& FLAG_NCR53C400
)) {
2481 while (!(NCR5380_read(BUS_AND_STATUS_REG
) & BASR_DRQ
));
2482 /* Wait for clean handshake */
2483 while (NCR5380_read(STATUS_REG
) & SR_REQ
);
2484 d
[c
- 1] = NCR5380_read(INPUT_DATA_REG
);
2489 #ifdef DMA_WORKS_RIGHT
2490 foo
= NCR5380_pwrite(instance
, d
, c
);
2493 #if (NDEBUG & NDEBUG_C400_PWRITE)
2494 printk("About to pwrite %d bytes\n", c
);
2496 if (!(foo
= NCR5380_pwrite(instance
, d
, c
))) {
2498 * Wait for the last byte to be sent. If REQ is being asserted for
2499 * the byte we're interested, we'll ACK it and it will go false.
2501 if (!(hostdata
->flags
& FLAG_HAS_LAST_BYTE_SENT
)) {
2505 while (!(NCR5380_read(BUS_AND_STATUS_REG
) &
2506 BASR_DRQ
) && (NCR5380_read(BUS_AND_STATUS_REG
) &
2509 if (NCR5380_read(STATUS_REG
) & SR_REQ
) {
2511 !(NCR5380_read(BUS_AND_STATUS_REG
) & BASR_ACK
);
2513 for (; timeout
&& (NCR5380_read(STATUS_REG
) & SR_REQ
);
2519 #if (NDEBUG & NDEBUG_LAST_BYTE_SENT)
2521 printk("scsi%d : timed out on last byte\n",
2526 if (hostdata
->flags
& FLAG_CHECK_LAST_BYTE_SENT
) {
2527 hostdata
->flags
&= ~FLAG_CHECK_LAST_BYTE_SENT
;
2528 if (NCR5380_read(TARGET_COMMAND_REG
) & TCR_LAST_BYTE_SENT
) {
2529 hostdata
->flags
|= FLAG_HAS_LAST_BYTE_SENT
;
2530 #if (NDEBUG & NDEBUG_LAST_BYTE_SENT)
2531 printk("scsi%d : last bit sent works\n",
2537 #if (NDEBUG & NDEBUG_C400_PWRITE)
2538 printk("Waiting for LASTBYTE\n");
2540 while (!(NCR5380_read(TARGET_COMMAND_REG
) & TCR_LAST_BYTE_SENT
));
2541 #if (NDEBUG & NDEBUG_C400_PWRITE)
2542 printk("Got LASTBYTE\n");
2551 NCR5380_write(MODE_REG
, MR_BASE
);
2552 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2554 if ((!(p
& SR_IO
)) && (hostdata
->flags
& FLAG_NCR53C400
)) {
2555 #if (NDEBUG & NDEBUG_C400_PWRITE)
2556 printk("53C400w: Checking for IRQ\n");
2558 if (NCR5380_read(BUS_AND_STATUS_REG
) & BASR_IRQ
) {
2559 #if (NDEBUG & NDEBUG_C400_PWRITE)
2560 printk("53C400w: got it, reading reset interrupt reg\n");
2562 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
2564 printk("53C400w: IRQ NOT THERE!\n");
2569 *phase
= NCR5380_read(STATUS_REG
) & PHASE_MASK
;
2571 NCR5380_print_phase(instance
);
2573 #if defined(PSEUDO_DMA) && !defined(UNSAFE)
2574 restore_flags(flags
);
2575 #endif /* defined(REAL_DMA_POLL) */
2577 #endif /* def REAL_DMA */
2579 #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */
2582 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
2584 * Purpose : run through the various SCSI phases and do as the target
2585 * directs us to. Operates on the currently connected command,
2586 * instance->connected.
2588 * Inputs : instance, instance for which we are doing commands
2590 * Side effects : SCSI things happen, the disconnected queue will be
2591 * modified if a command disconnects, *instance->connected will
2594 * XXX Note : we need to watch for bus free or a reset condition here
2595 * to recover from an unexpected bus free condition.
2598 static void NCR5380_information_transfer(struct Scsi_Host
*instance
) {
2599 NCR5380_local_declare();
2600 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*)
2602 unsigned char msgout
= NOP
;
2605 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2608 unsigned char *data
;
2609 unsigned char phase
, tmp
, extended_msg
[10], old_phase
= 0xff;
2610 Scsi_Cmnd
*cmd
= (Scsi_Cmnd
*) hostdata
->connected
;
2612 /* RvC: we need to set the end of the polling time */
2613 unsigned long poll_time
= jiffies
+ USLEEP_POLL
;
2616 NCR5380_setup(instance
);
2619 tmp
= NCR5380_read(STATUS_REG
);
2620 /* We only have a valid SCSI phase when REQ is asserted */
2622 phase
= (tmp
& PHASE_MASK
);
2623 if (phase
!= old_phase
) {
2625 #if (NDEBUG & NDEBUG_INFORMATION)
2626 NCR5380_print_phase(instance
);
2629 if (sink
&& (phase
!= PHASE_MSGOUT
)) {
2630 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
2632 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
|
2634 while (NCR5380_read(STATUS_REG
) & SR_REQ
);
2635 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2643 #if (NDEBUG & NDEBUG_NO_DATAOUT)
2644 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n",
2648 cmd
->result
= DID_ERROR
<< 16;
2653 * If there is no room left in the current buffer in the
2654 * scatter-gather list, move onto the next one.
2657 if (!cmd
->SCp
.this_residual
&& cmd
->SCp
.buffers_residual
) {
2659 --cmd
->SCp
.buffers_residual
;
2660 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
2661 cmd
->SCp
.ptr
= cmd
->SCp
.buffer
->address
;
2662 #if (NDEBUG & NDEBUG_INFORMATION)
2663 printk("scsi%d : %d bytes and %d buffers left\n",
2664 instance
->host_no
, cmd
->SCp
.this_residual
,
2665 cmd
->SCp
.buffers_residual
);
2669 * The preferred transfer method is going to be
2670 * PSEUDO-DMA for systems that are strictly PIO,
2671 * since we can let the hardware do the handshaking.
2673 * For this to work, we need to know the transfersize
2674 * ahead of time, since the pseudo-DMA code will sit
2675 * in an unconditional loop.
2678 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
2680 * PSEUDO_DMA is defined here. If this is the g_NCR5380
2681 * driver then it will always be defined, so the
2682 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
2683 * NCR5380 case. I think this is a fairly clean solution.
2684 * We supplement these 2 if's with the flag.
2686 #ifdef NCR5380_dma_xfer_len
2687 if (!cmd
->device
->borken
&&
2688 !(hostdata
->flags
& FLAG_NO_PSEUDO_DMA
) &&
2689 (transfersize
= NCR5380_dma_xfer_len(instance
, cmd
)) != 0) {
2691 transfersize
= cmd
->transfersize
;
2693 #ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */
2694 if (transfersize
> 512)
2696 #endif /* LIMIT_TRANSFERSIZE */
2698 if (!cmd
->device
->borken
&& transfersize
&&
2699 !(hostdata
->flags
& FLAG_NO_PSEUDO_DMA
) &&
2700 cmd
->SCp
.this_residual
&& !(cmd
->SCp
.this_residual
%
2702 /* Limit transfers to 32K, for xx400 & xx406
2703 * pseudoDMA that transfers in 128 bytes blocks. */
2704 if (transfersize
> 32 * 1024)
2705 transfersize
= 32 * 1024;
2708 if (NCR5380_transfer_dma(instance
, &phase
,
2709 &len
, (unsigned char **) &cmd
->SCp
.ptr
)) {
2711 * If the watchdog timer fires, all future accesses to this
2712 * device will use the polled-IO.
2714 printk("scsi%d : switching target %d lun %d to slow handshake\n",
2715 instance
->host_no
, cmd
->target
, cmd
->lun
);
2716 cmd
->device
->borken
= 1;
2717 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2721 cmd
->result
= DID_ERROR
<< 16;
2723 /* XXX - need to source or sink data here, as appropriate */
2725 cmd
->SCp
.this_residual
-= transfersize
- len
;
2727 #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */
2728 NCR5380_transfer_pio(instance
, &phase
,
2729 (int *) &cmd
->SCp
.this_residual
, (unsigned char **)
2735 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2736 cmd
->SCp
.Message
= tmp
;
2740 * Linking lets us reduce the time required to get the
2741 * next command out to the device, hopefully this will
2742 * mean we don't waste another revolution due to the delays
2743 * required by ARBITRATION and another SELECTION.
2745 * In the current implementation proposal, low level drivers
2746 * merely have to start the next command, pointed to by
2747 * next_link, done() is called as with unlinked commands.
2750 case LINKED_CMD_COMPLETE
:
2751 case LINKED_FLG_CMD_COMPLETE
:
2752 /* Accept message by clearing ACK */
2753 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2755 #if (NDEBUG & NDEBUG_LINKED)
2756 printk("scsi%d : target %d lun %d linked command complete.\n",
2757 instance
->host_no
, cmd
->target
, cmd
->lun
);
2760 * Sanity check : A linked command should only terminate with
2761 * one of these messages if there are more linked commands
2765 if (!cmd
->next_link
) {
2766 printk("scsi%d : target %d lun %d linked command complete, no next_link\n"
2767 instance
->host_no
, cmd
->target
, cmd
->lun
);
2772 initialize_SCp(cmd
->next_link
);
2773 /* The next command is still part of this process */
2774 cmd
->next_link
->tag
= cmd
->tag
;
2775 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
2776 #if (NDEBUG & NDEBUG_LINKED)
2777 printk("scsi%d : target %d lun %d linked request done, calling scsi_done().\n",
2778 instance
->host_no
, cmd
->target
, cmd
->lun
);
2780 #ifdef NCR5380_STATS
2781 collect_stats(hostdata
, cmd
);
2783 cmd
->scsi_done(cmd
);
2784 cmd
= hostdata
->connected
;
2786 #endif /* def LINKED */
2788 case COMMAND_COMPLETE
:
2789 /* Accept message by clearing ACK */
2791 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2792 hostdata
->connected
= NULL
;
2793 #if (NDEBUG & NDEBUG_QUEUES)
2794 printk("scsi%d : command for target %d, lun %d completed\n",
2795 instance
->host_no
, cmd
->target
, cmd
->lun
);
2797 hostdata
->busy
[cmd
->target
] &= ~(1 << cmd
->lun
);
2800 * I'm not sure what the correct thing to do here is :
2802 * If the command that just executed is NOT a request
2803 * sense, the obvious thing to do is to set the result
2804 * code to the values of the stored parameters.
2806 * If it was a REQUEST SENSE command, we need some way
2807 * to differentiate between the failure code of the original
2808 * and the failure code of the REQUEST sense - the obvious
2809 * case is success, where we fall through and leave the result
2812 * The non-obvious place is where the REQUEST SENSE failed
2815 if (cmd
->cmnd
[0] != REQUEST_SENSE
)
2816 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
2817 else if (cmd
->SCp
.Status
!= GOOD
)
2818 cmd
->result
= (cmd
->result
& 0x00ffff) | (DID_ERROR
<< 16);
2821 if ((cmd
->cmnd
[0] != REQUEST_SENSE
) &&
2822 (cmd
->SCp
.Status
== CHECK_CONDITION
)) {
2823 unsigned long flags
;
2824 #if (NDEBUG & NDEBUG_AUTOSENSE)
2825 printk("scsi%d : performing request sense\n",
2828 cmd
->cmnd
[0] = REQUEST_SENSE
;
2829 cmd
->cmnd
[1] &= 0xe0;
2832 cmd
->cmnd
[4] = sizeof(cmd
->sense_buffer
);
2835 cmd
->SCp
.buffer
= NULL
;
2836 cmd
->SCp
.buffers_residual
= 0;
2837 cmd
->SCp
.ptr
= (char *) cmd
->sense_buffer
;
2838 cmd
->SCp
.this_residual
= sizeof(cmd
->sense_buffer
);
2842 LIST(cmd
, hostdata
->issue_queue
);
2843 cmd
->host_scribble
= (unsigned char *)
2844 hostdata
->issue_queue
;
2845 hostdata
->issue_queue
= (Scsi_Cmnd
*) cmd
;
2846 restore_flags(flags
);
2847 #if (NDEBUG & NDEBUG_QUEUES)
2848 printk("scsi%d : REQUEST SENSE added to head of issue queue\n", instance
->host_no
);
2851 #endif /* def AUTOSENSE */
2852 #ifdef NCR5380_STATS
2853 collect_stats(hostdata
, cmd
);
2855 cmd
->scsi_done(cmd
);
2858 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2860 * Restore phase bits to 0 so an interrupted selection,
2861 * arbitration can resume.
2863 NCR5380_write(TARGET_COMMAND_REG
, 0);
2865 while ((NCR5380_read(STATUS_REG
) & SR_BSY
) && !hostdata
->connected
)
2868 case MESSAGE_REJECT
:
2869 /* Accept message by clearing ACK */
2870 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2871 switch (hostdata
->last_message
) {
2872 case HEAD_OF_QUEUE_TAG
:
2873 case ORDERED_QUEUE_TAG
:
2874 case SIMPLE_QUEUE_TAG
:
2875 cmd
->device
->tagged_queue
= 0;
2876 hostdata
->busy
[cmd
->target
] |= (1 << cmd
->lun
);
2882 unsigned long flags
;
2883 /* Accept message by clearing ACK */
2884 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2885 cmd
->device
->disconnect
= 1;
2888 LIST(cmd
, hostdata
->disconnected_queue
);
2889 cmd
->host_scribble
= (unsigned char *)
2890 hostdata
->disconnected_queue
;
2891 hostdata
->connected
= NULL
;
2892 hostdata
->disconnected_queue
= cmd
;
2893 restore_flags(flags
);
2894 #if (NDEBUG & NDEBUG_QUEUES)
2895 printk("scsi%d : command for target %d lun %d was moved from connected to"
2896 " the disconnected_queue\n", instance
->host_no
,
2897 cmd
->target
, cmd
->lun
);
2900 * Restore phase bits to 0 so an interrupted selection,
2901 * arbitration can resume.
2903 NCR5380_write(TARGET_COMMAND_REG
, 0);
2905 /* Enable reselect interrupts */
2906 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2907 /* Wait for bus free to avoid nasty timeouts */
2908 while ((NCR5380_read(STATUS_REG
) & SR_BSY
) && !hostdata
->connected
)
2911 NCR5380_print_status(instance
);
2916 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2917 * operation, in violation of the SCSI spec so we can safely
2918 * ignore SAVE/RESTORE pointers calls.
2920 * Unfortunately, some disks violate the SCSI spec and
2921 * don't issue the required SAVE_POINTERS message before
2922 * disconnecting, and we have to break spec to remain
2926 case RESTORE_POINTERS
:
2927 /* Accept message by clearing ACK */
2928 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2930 case EXTENDED_MESSAGE
:
2932 * Extended messages are sent in the following format :
2934 * 0 EXTENDED_MESSAGE == 1
2935 * 1 length (includes one byte for code, doesn't
2936 * include first two bytes)
2938 * 3..length+1 arguments
2940 * Start the extended message buffer with the EXTENDED_MESSAGE
2941 * byte, since print_msg() wants the whole thing.
2943 extended_msg
[0] = EXTENDED_MESSAGE
;
2944 /* Accept first byte by clearing ACK */
2945 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2947 #if (NDEBUG & NDEBUG_EXTENDED)
2948 printk("scsi%d : receiving extended message\n",
2953 data
= extended_msg
+ 1;
2954 phase
= PHASE_MSGIN
;
2955 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2957 #if (NDEBUG & NDEBUG_EXTENDED)
2958 printk("scsi%d : length=%d, code=0x%02x\n",
2959 instance
->host_no
, (int) extended_msg
[1],
2960 (int) extended_msg
[2]);
2963 if (!len
&& extended_msg
[1] <=
2964 (sizeof(extended_msg
) - 1)) {
2965 /* Accept third byte by clearing ACK */
2966 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2967 len
= extended_msg
[1] - 1;
2968 data
= extended_msg
+ 3;
2969 phase
= PHASE_MSGIN
;
2971 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2973 #if (NDEBUG & NDEBUG_EXTENDED)
2974 printk("scsi%d : message received, residual %d\n",
2975 instance
->host_no
, len
);
2978 switch (extended_msg
[2]) {
2981 case EXTENDED_MODIFY_DATA_POINTER
:
2982 case EXTENDED_EXTENDED_IDENTIFY
:
2986 printk("scsi%d: error receiving extended message\n",
2990 printk("scsi%d: extended message code %02x length %d is too long\n",
2991 instance
->host_no
, extended_msg
[2], extended_msg
[1]);
2994 /* Fall through to reject message */
2997 * If we get something weird that we aren't expecting,
3002 printk("scsi%d: rejecting message ", instance
->host_no
);
3003 print_msg(extended_msg
);
3005 } else if (tmp
!= EXTENDED_MESSAGE
)
3006 printk("scsi%d: rejecting unknown message %02x from target %d, lun %d\n",
3007 instance
->host_no
, tmp
, cmd
->target
, cmd
->lun
);
3009 printk("scsi%d: rejecting unknown extended message code %02x, length %d from target %d, lun %d\n",
3010 instance
->host_no
, extended_msg
[1], extended_msg
[0], cmd
->target
, cmd
->lun
);
3012 msgout
= MESSAGE_REJECT
;
3013 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
3016 } /* switch (tmp) */
3021 hostdata
->last_message
= msgout
;
3022 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
3023 if (msgout
== ABORT
) {
3024 hostdata
->busy
[cmd
->target
] &= ~(1 << cmd
->lun
);
3025 hostdata
->connected
= NULL
;
3026 cmd
->result
= DID_ERROR
<< 16;
3027 #ifdef NCR5380_STATS
3028 collect_stats(hostdata
, cmd
);
3030 cmd
->scsi_done(cmd
);
3031 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
3040 * XXX for performance reasons, on machines with a
3041 * PSEUDO-DMA architecture we should probably
3042 * use the dma transfer function.
3044 NCR5380_transfer_pio(instance
, &phase
, &len
,
3047 if (!cmd
->device
->disconnect
&&
3048 should_disconnect(cmd
->cmnd
[0]))
3050 hostdata
->time_expires
= jiffies
+ USLEEP_SLEEP
;
3051 #if (NDEBUG & NDEBUG_USLEEP)
3052 printk("scsi%d : issued command, sleeping until %ul\n", instance
->host_no
,
3053 hostdata
->time_expires
);
3055 NCR5380_set_timer(instance
);
3058 #endif /* def USLEEP */
3063 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
3064 cmd
->SCp
.Status
= tmp
;
3067 printk("scsi%d : unknown phase\n", instance
->host_no
);
3069 NCR5380_print(instance
);
3071 } /* switch(phase) */
3072 } /* if (tmp * SR_REQ) */
3076 /* RvC: go to sleep if polling time expired
3078 if (!cmd
->device
->disconnect
&& time_after_eq(jiffies
, poll_time
))
3080 hostdata
->time_expires
= jiffies
+ USLEEP_SLEEP
;
3081 #if (NDEBUG & NDEBUG_USLEEP)
3082 printk("scsi%d : poll timed out, sleeping until %ul\n", instance
->host_no
,
3083 hostdata
->time_expires
);
3085 NCR5380_set_timer(instance
);
3094 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
3096 * Purpose : does reselection, initializing the instance->connected
3097 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
3098 * nexus has been reestablished,
3100 * Inputs : instance - this instance of the NCR5380.
3105 static void NCR5380_reselect(struct Scsi_Host
*instance
) {
3106 NCR5380_local_declare();
3107 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*)
3109 unsigned char target_mask
;
3110 unsigned char lun
, phase
;
3115 unsigned char msg
[3];
3116 unsigned char *data
;
3117 Scsi_Cmnd
*tmp
= NULL
, *prev
;
3119 NCR5380_setup(instance
);
3122 * Disable arbitration, etc. since the host adapter obviously
3123 * lost, and tell an interrupted NCR5380_select() to restart.
3126 NCR5380_write(MODE_REG
, MR_BASE
);
3127 hostdata
->restart_select
= 1;
3129 target_mask
= NCR5380_read(CURRENT_SCSI_DATA_REG
) & ~(hostdata
->id_mask
);
3131 #if (NDEBUG & NDEBUG_RESELECTION)
3132 printk("scsi%d : reselect\n", instance
->host_no
);
3136 * At this point, we have detected that our SCSI ID is on the bus,
3137 * SEL is true and BSY was false for at least one bus settle delay
3140 * We must assert BSY ourselves, until the target drops the SEL
3144 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_BSY
);
3146 while (NCR5380_read(STATUS_REG
) & SR_SEL
);
3147 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
3150 * Wait for target to go into MSGIN.
3153 while (!(NCR5380_read(STATUS_REG
) & SR_REQ
));
3157 phase
= PHASE_MSGIN
;
3158 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
3161 if (!msg
[0] & 0x80) {
3162 printk("scsi%d : expecting IDENTIFY message, got ",
3167 /* Accept message by clearing ACK */
3168 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
3169 lun
= (msg
[0] & 0x07);
3172 * We need to add code for SCSI-II to track which devices have
3173 * I_T_L_Q nexuses established, and which have simple I_T_L
3174 * nexuses so we can chose to do additional data transfer.
3178 #error "SCSI-II tagged queueing is not supported yet"
3182 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
3183 * just reestablished, and remove it from the disconnected queue.
3187 for (tmp
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
, prev
= NULL
;
3188 tmp
; prev
= tmp
, tmp
= (Scsi_Cmnd
*) tmp
->host_scribble
)
3189 if ((target_mask
== (1 << tmp
->target
)) && (lun
== tmp
->lun
)
3191 && (tag
== tmp
->tag
)
3195 REMOVE(prev
, prev
->host_scribble
, tmp
, tmp
->host_scribble
);
3196 prev
->host_scribble
= tmp
->host_scribble
;
3198 REMOVE(-1, hostdata
->disconnected_queue
, tmp
, tmp
->host_scribble
);
3199 hostdata
->disconnected_queue
= (Scsi_Cmnd
*) tmp
->host_scribble
;
3201 tmp
->host_scribble
= NULL
;
3206 printk("scsi%d : warning : target bitmask %02x lun %d tag %d not in disconnect_queue.\n",
3207 instance
->host_no
, target_mask
, lun
, tag
);
3209 printk("scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n",
3210 instance
->host_no
, target_mask
, lun
);
3213 * Since we have an established nexus that we can't do anything with,
3223 hostdata
->connected
= tmp
;
3224 #if (NDEBUG & NDEBUG_RESELECTION)
3225 printk("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n",
3226 instance
->host_no
, tmp
->target
, tmp
->lun
, tmp
->tag
);
3232 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
3234 * Purpose : called by interrupt handler when DMA finishes or a phase
3235 * mismatch occurs (which would finish the DMA transfer).
3237 * Inputs : instance - this instance of the NCR5380.
3239 * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L
3240 * nexus has been reestablished, on failure NULL is returned.
3244 static void NCR5380_dma_complete(NCR5380_instance
* instance
) {
3245 NCR5380_local_declare();
3246 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*
3247 instance
->hostdata
);
3249 NCR5380_setup(instance
);
3252 * XXX this might not be right.
3254 * Wait for final byte to transfer, ie wait for ACK to go false.
3256 * We should use the Last Byte Sent bit, unfortunately this is
3257 * not available on the 5380/5381 (only the various CMOS chips)
3260 while (NCR5380_read(BUS_AND_STATUS_REG
) & BASR_ACK
);
3262 NCR5380_write(MODE_REG
, MR_BASE
);
3263 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
3266 * The only places we should see a phase mismatch and have to send
3267 * data from the same set of pointers will be the data transfer
3268 * phases. So, residual, requested length are only important here.
3271 if (!(hostdata
->connected
->SCp
.phase
& SR_CD
)) {
3272 transferred
= instance
->dmalen
- NCR5380_dma_residual();
3273 hostdata
->connected
->SCp
.this_residual
-= transferred
;
3274 hostdata
->connected
->SCp
.ptr
+= transferred
;
3277 #endif /* def REAL_DMA */
3280 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
3282 * Purpose : abort a command
3284 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
3285 * host byte of the result field to, if zero DID_ABORTED is
3288 * Returns : 0 - success, -1 on failure.
3290 * XXX - there is no way to abort the command that is currently
3291 * connected, you have to wait for it to complete. If this is
3292 * a problem, we could implement longjmp() / setjmp(), setjmp()
3293 * called where the loop started in NCR5380_main().
3296 #ifndef NCR5380_abort
3299 int NCR5380_abort(Scsi_Cmnd
* cmd
) {
3300 NCR5380_local_declare();
3301 unsigned long flags
;
3302 struct Scsi_Host
*instance
= cmd
->host
;
3303 struct NCR5380_hostdata
*hostdata
= (struct NCR5380_hostdata
*)
3305 Scsi_Cmnd
*tmp
, **prev
;
3307 printk("scsi%d : aborting command\n", instance
->host_no
);
3308 print_Scsi_Cmnd(cmd
);
3310 NCR5380_print_status(instance
);
3312 printk("scsi%d : aborting command\n", instance
->host_no
);
3313 print_Scsi_Cmnd(cmd
);
3315 NCR5380_print_status(instance
);
3319 NCR5380_setup(instance
);
3321 #if (NDEBUG & NDEBUG_ABORT)
3322 printk("scsi%d : abort called\n", instance
->host_no
);
3323 printk(" basr 0x%X, sr 0x%X\n",
3324 NCR5380_read(BUS_AND_STATUS_REG
), NCR5380_read(STATUS_REG
));
3329 * Case 1 : If the command is the currently executing command,
3330 * we'll set the aborted flag and return control so that
3331 * information transfer routine can exit cleanly.
3334 if (hostdata
->connected
== cmd
) {
3335 #if (NDEBUG & NDEBUG_ABORT)
3336 printk("scsi%d : aborting connected command\n", instance
->host_no
);
3338 hostdata
->aborted
= 1;
3340 * We should perform BSY checking, and make sure we haven't slipped
3344 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_ASSERT_ATN
);
3346 * Since we can't change phases until we've completed the current
3347 * handshake, we have to source or sink a byte of data if the current
3348 * phase is not MSGOUT.
3352 * Return control to the executing NCR drive so we can clear the
3353 * aborted flag and get back into our main loop.
3361 * Case 2 : If the command hasn't been issued yet, we simply remove it
3362 * from the issue queue.
3364 #if (NDEBUG & NDEBUG_ABORT)
3366 printk("scsi%d : abort going into loop.\n", instance
->host_no
);
3368 for (prev
= (Scsi_Cmnd
**) & (hostdata
->issue_queue
),
3369 tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
;
3370 tmp
; prev
= (Scsi_Cmnd
**) & (tmp
->host_scribble
), tmp
=
3371 (Scsi_Cmnd
*) tmp
->host_scribble
)
3373 REMOVE(5, *prev
, tmp
, tmp
->host_scribble
);
3374 (*prev
) = (Scsi_Cmnd
*) tmp
->host_scribble
;
3375 tmp
->host_scribble
= NULL
;
3376 tmp
->result
= DID_ABORT
<< 16;
3377 restore_flags(flags
);
3378 #if (NDEBUG & NDEBUG_ABORT)
3379 printk("scsi%d : abort removed command from issue queue.\n",
3383 return SCSI_ABORT_SUCCESS
;
3385 #if (NDEBUG & NDEBUG_ABORT)
3387 else if (prev
== tmp
)
3388 printk("scsi%d : LOOP\n", instance
->host_no
);
3392 * Case 3 : If any commands are connected, we're going to fail the abort
3393 * and let the high level SCSI driver retry at a later time or
3396 * Timeouts, and therefore aborted commands, will be highly unlikely
3397 * and handling them cleanly in this situation would make the common
3398 * case of noresets less efficient, and would pollute our code. So,
3402 if (hostdata
->connected
) {
3403 restore_flags(flags
);
3404 #if (NDEBUG & NDEBUG_ABORT)
3405 printk("scsi%d : abort failed, command connected.\n", instance
->host_no
);
3407 return SCSI_ABORT_NOT_RUNNING
;
3410 * Case 4: If the command is currently disconnected from the bus, and
3411 * there are no connected commands, we reconnect the I_T_L or
3412 * I_T_L_Q nexus associated with it, go into message out, and send
3415 * This case is especially ugly. In order to reestablish the nexus, we
3416 * need to call NCR5380_select(). The easiest way to implement this
3417 * function was to abort if the bus was busy, and let the interrupt
3418 * handler triggered on the SEL for reselect take care of lost arbitrations
3419 * where necessary, meaning interrupts need to be enabled.
3421 * When interrupts are enabled, the queues may change - so we
3422 * can't remove it from the disconnected queue before selecting it
3423 * because that could cause a failure in hashing the nexus if that
3424 * device reselected.
3426 * Since the queues may change, we can't use the pointers from when we
3429 * So, we must first locate the command, and if NCR5380_select()
3430 * succeeds, then issue the abort, relocate the command and remove
3431 * it from the disconnected queue.
3434 for (tmp
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
; tmp
;
3435 tmp
= (Scsi_Cmnd
*) tmp
->host_scribble
)
3437 restore_flags(flags
);
3438 #if (NDEBUG & NDEBUG_ABORT)
3439 printk("scsi%d : aborting disconnected command.\n", instance
->host_no
);
3442 if (NCR5380_select(instance
, cmd
, (int) cmd
->tag
))
3443 return SCSI_ABORT_BUSY
;
3445 #if (NDEBUG & NDEBUG_ABORT)
3446 printk("scsi%d : nexus reestablished.\n", instance
->host_no
);
3452 for (prev
= (Scsi_Cmnd
**) & (hostdata
->disconnected_queue
),
3453 tmp
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
;
3454 tmp
; prev
= (Scsi_Cmnd
**) & (tmp
->host_scribble
), tmp
=
3455 (Scsi_Cmnd
*) tmp
->host_scribble
)
3457 REMOVE(5, *prev
, tmp
, tmp
->host_scribble
);
3458 *prev
= (Scsi_Cmnd
*) tmp
->host_scribble
;
3459 tmp
->host_scribble
= NULL
;
3460 tmp
->result
= DID_ABORT
<< 16;
3461 restore_flags(flags
);
3463 return SCSI_ABORT_SUCCESS
;
3467 * Case 5 : If we reached this point, the command was not found in any of
3470 * We probably reached this point because of an unlikely race condition
3471 * between the command completing successfully and the abortion code,
3472 * so we won't panic, but we will notify the user in case something really
3476 restore_flags(flags
);
3477 printk("scsi%d : warning : SCSI command probably completed successfully\n"
3478 " before abortion\n", instance
->host_no
);
3479 return SCSI_ABORT_NOT_RUNNING
;
3484 * Function : int NCR5380_reset (Scsi_Cmnd *cmd, unsigned int reset_flags)
3486 * Purpose : reset the SCSI bus.
3488 * Returns : SCSI_RESET_WAKEUP
3492 #ifndef NCR5380_reset
3495 int NCR5380_reset(Scsi_Cmnd
* cmd
, unsigned int dummy
) {
3496 NCR5380_local_declare();
3497 NCR5380_setup(cmd
->host
);
3499 NCR5380_print_status(cmd
->host
);
3500 do_reset(cmd
->host
);
3502 return SCSI_RESET_WAKEUP
;