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1 | /* |
2 | * NCR 5380 generic driver routines. These should make it *trivial* |
3 | * to implement 5380 SCSI drivers under Linux with a non-trantor |
4 | * architecture. |
5 | * |
6 | * Note that these routines also work with NR53c400 family chips. |
7 | * |
8 | * Copyright 1993, Drew Eckhardt |
9 | * Visionary Computing |
10 | * (Unix and Linux consulting and custom programming) |
11 | * drew@colorado.edu |
12 | * +1 (303) 666-5836 |
13 | * |
14 | * DISTRIBUTION RELEASE 6. |
15 | * |
16 | * For more information, please consult |
17 | * |
18 | * NCR 5380 Family |
19 | * SCSI Protocol Controller |
20 | * Databook |
21 | * |
22 | * NCR Microelectronics |
23 | * 1635 Aeroplaza Drive |
24 | * Colorado Springs, CO 80916 |
25 | * 1+ (719) 578-3400 |
26 | * 1+ (800) 334-5454 |
27 | */ |
28 | |
29 | /* |
30 | * $Log: NCR5380.c,v $ |
31 | |
32 | * Revision 1.10 1998/9/2 Alan Cox |
33 | * (alan@lxorguk.ukuu.org.uk) |
34 | * Fixed up the timer lockups reported so far. Things still suck. Looking |
35 | * forward to 2.3 and per device request queues. Then it'll be possible to |
36 | * SMP thread this beast and improve life no end. |
37 | |
38 | * Revision 1.9 1997/7/27 Ronald van Cuijlenborg |
39 | * (ronald.van.cuijlenborg@tip.nl or nutty@dds.nl) |
40 | * (hopefully) fixed and enhanced USLEEP |
41 | * added support for DTC3181E card (for Mustek scanner) |
42 | * |
43 | |
44 | * Revision 1.8 Ingmar Baumgart |
45 | * (ingmar@gonzo.schwaben.de) |
46 | * added support for NCR53C400a card |
47 | * |
48 | |
49 | * Revision 1.7 1996/3/2 Ray Van Tassle (rayvt@comm.mot.com) |
50 | * added proc_info |
51 | * added support needed for DTC 3180/3280 |
52 | * fixed a couple of bugs |
53 | * |
54 | |
55 | * Revision 1.5 1994/01/19 09:14:57 drew |
56 | * Fixed udelay() hack that was being used on DATAOUT phases |
57 | * instead of a proper wait for the final handshake. |
58 | * |
59 | * Revision 1.4 1994/01/19 06:44:25 drew |
60 | * *** empty log message *** |
61 | * |
62 | * Revision 1.3 1994/01/19 05:24:40 drew |
63 | * Added support for TCR LAST_BYTE_SENT bit. |
64 | * |
65 | * Revision 1.2 1994/01/15 06:14:11 drew |
66 | * REAL DMA support, bug fixes. |
67 | * |
68 | * Revision 1.1 1994/01/15 06:00:54 drew |
69 | * Initial revision |
70 | * |
71 | */ |
72 | |
73 | /* |
74 | * Further development / testing that should be done : |
75 | * 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete |
76 | * code so that everything does the same thing that's done at the |
77 | * end of a pseudo-DMA read operation. |
78 | * |
79 | * 2. Fix REAL_DMA (interrupt driven, polled works fine) - |
80 | * basically, transfer size needs to be reduced by one |
81 | * and the last byte read as is done with PSEUDO_DMA. |
82 | * |
83 | * 4. Test SCSI-II tagged queueing (I have no devices which support |
84 | * tagged queueing) |
85 | * |
86 | * 5. Test linked command handling code after Eric is ready with |
87 | * the high level code. |
88 | */ |
89 | #include <scsi/scsi_dbg.h> |
90 | #include <scsi/scsi_transport_spi.h> |
91 | |
92 | #ifndef NDEBUG |
93 | #define NDEBUG 0 |
94 | #endif |
95 | #ifndef NDEBUG_ABORT |
96 | #define NDEBUG_ABORT 0 |
97 | #endif |
98 | |
99 | #if (NDEBUG & NDEBUG_LISTS) |
100 | #define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); } |
101 | #define REMOVE(w,x,y,z) {printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, (void*)(w), (void*)(x), (void*)(y), (void*)(z)); if ((x)==(y)) udelay(5); } |
102 | #else |
103 | #define LIST(x,y) |
104 | #define REMOVE(w,x,y,z) |
105 | #endif |
106 | |
107 | #ifndef notyet |
108 | #undef LINKED |
109 | #undef REAL_DMA |
110 | #endif |
111 | |
112 | #ifdef REAL_DMA_POLL |
113 | #undef READ_OVERRUNS |
114 | #define READ_OVERRUNS |
115 | #endif |
116 | |
117 | #ifdef BOARD_REQUIRES_NO_DELAY |
118 | #define io_recovery_delay(x) |
119 | #else |
120 | #define io_recovery_delay(x) udelay(x) |
121 | #endif |
122 | |
123 | /* |
124 | * Design |
125 | * |
126 | * This is a generic 5380 driver. To use it on a different platform, |
127 | * one simply writes appropriate system specific macros (ie, data |
128 | * transfer - some PC's will use the I/O bus, 68K's must use |
129 | * memory mapped) and drops this file in their 'C' wrapper. |
130 | * |
131 | * (Note from hch: unfortunately it was not enough for the different |
132 | * m68k folks and instead of improving this driver they copied it |
133 | * and hacked it up for their needs. As a consequence they lost |
134 | * most updates to this driver. Maybe someone will fix all these |
135 | * drivers to use a common core one day..) |
136 | * |
137 | * As far as command queueing, two queues are maintained for |
138 | * each 5380 in the system - commands that haven't been issued yet, |
139 | * and commands that are currently executing. This means that an |
140 | * unlimited number of commands may be queued, letting |
141 | * more commands propagate from the higher driver levels giving higher |
142 | * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, |
143 | * allowing multiple commands to propagate all the way to a SCSI-II device |
144 | * while a command is already executing. |
145 | * |
146 | * |
147 | * Issues specific to the NCR5380 : |
148 | * |
149 | * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead |
150 | * piece of hardware that requires you to sit in a loop polling for |
151 | * the REQ signal as long as you are connected. Some devices are |
152 | * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect |
153 | * while doing long seek operations. |
154 | * |
155 | * The workaround for this is to keep track of devices that have |
156 | * disconnected. If the device hasn't disconnected, for commands that |
157 | * should disconnect, we do something like |
158 | * |
159 | * while (!REQ is asserted) { sleep for N usecs; poll for M usecs } |
160 | * |
161 | * Some tweaking of N and M needs to be done. An algorithm based |
162 | * on "time to data" would give the best results as long as short time |
163 | * to datas (ie, on the same track) were considered, however these |
164 | * broken devices are the exception rather than the rule and I'd rather |
165 | * spend my time optimizing for the normal case. |
166 | * |
167 | * Architecture : |
168 | * |
169 | * At the heart of the design is a coroutine, NCR5380_main, |
170 | * which is started from a workqueue for each NCR5380 host in the |
171 | * system. It attempts to establish I_T_L or I_T_L_Q nexuses by |
172 | * removing the commands from the issue queue and calling |
173 | * NCR5380_select() if a nexus is not established. |
174 | * |
175 | * Once a nexus is established, the NCR5380_information_transfer() |
176 | * phase goes through the various phases as instructed by the target. |
177 | * if the target goes into MSG IN and sends a DISCONNECT message, |
178 | * the command structure is placed into the per instance disconnected |
179 | * queue, and NCR5380_main tries to find more work. If the target is |
180 | * idle for too long, the system will try to sleep. |
181 | * |
182 | * If a command has disconnected, eventually an interrupt will trigger, |
183 | * calling NCR5380_intr() which will in turn call NCR5380_reselect |
184 | * to reestablish a nexus. This will run main if necessary. |
185 | * |
186 | * On command termination, the done function will be called as |
187 | * appropriate. |
188 | * |
189 | * SCSI pointers are maintained in the SCp field of SCSI command |
190 | * structures, being initialized after the command is connected |
191 | * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. |
192 | * Note that in violation of the standard, an implicit SAVE POINTERS operation |
193 | * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. |
194 | */ |
195 | |
196 | /* |
197 | * Using this file : |
198 | * This file a skeleton Linux SCSI driver for the NCR 5380 series |
199 | * of chips. To use it, you write an architecture specific functions |
200 | * and macros and include this file in your driver. |
201 | * |
202 | * These macros control options : |
203 | * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be |
204 | * defined. |
205 | * |
206 | * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically |
207 | * for commands that return with a CHECK CONDITION status. |
208 | * |
209 | * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential |
210 | * transceivers. |
211 | * |
212 | * DONT_USE_INTR - if defined, never use interrupts, even if we probe or |
213 | * override-configure an IRQ. |
214 | * |
215 | * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512 |
216 | * bytes at a time. Since interrupts are disabled by default during |
217 | * these transfers, we might need this to give reasonable interrupt |
218 | * service time if the transfer size gets too large. |
219 | * |
220 | * LINKED - if defined, linked commands are supported. |
221 | * |
222 | * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases. |
223 | * |
224 | * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. |
225 | * |
226 | * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't |
227 | * rely on phase mismatch and EOP interrupts to determine end |
228 | * of phase. |
229 | * |
230 | * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You |
231 | * only really want to use this if you're having a problem with |
232 | * dropped characters during high speed communications, and even |
233 | * then, you're going to be better off twiddling with transfersize |
234 | * in the high level code. |
235 | * |
236 | * Defaults for these will be provided although the user may want to adjust |
237 | * these to allocate CPU resources to the SCSI driver or "real" code. |
238 | * |
239 | * USLEEP_SLEEP - amount of time, in jiffies, to sleep |
240 | * |
241 | * USLEEP_POLL - amount of time, in jiffies, to poll |
242 | * |
243 | * These macros MUST be defined : |
244 | * NCR5380_local_declare() - declare any local variables needed for your |
245 | * transfer routines. |
246 | * |
247 | * NCR5380_setup(instance) - initialize any local variables needed from a given |
248 | * instance of the host adapter for NCR5380_{read,write,pread,pwrite} |
249 | * |
250 | * NCR5380_read(register) - read from the specified register |
251 | * |
252 | * NCR5380_write(register, value) - write to the specific register |
253 | * |
254 | * NCR5380_implementation_fields - additional fields needed for this |
255 | * specific implementation of the NCR5380 |
256 | * |
257 | * Either real DMA *or* pseudo DMA may be implemented |
258 | * REAL functions : |
259 | * NCR5380_REAL_DMA should be defined if real DMA is to be used. |
260 | * Note that the DMA setup functions should return the number of bytes |
261 | * that they were able to program the controller for. |
262 | * |
263 | * Also note that generic i386/PC versions of these macros are |
264 | * available as NCR5380_i386_dma_write_setup, |
265 | * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. |
266 | * |
267 | * NCR5380_dma_write_setup(instance, src, count) - initialize |
268 | * NCR5380_dma_read_setup(instance, dst, count) - initialize |
269 | * NCR5380_dma_residual(instance); - residual count |
270 | * |
271 | * PSEUDO functions : |
272 | * NCR5380_pwrite(instance, src, count) |
273 | * NCR5380_pread(instance, dst, count); |
274 | * |
275 | * The generic driver is initialized by calling NCR5380_init(instance), |
276 | * after setting the appropriate host specific fields and ID. If the |
277 | * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, |
278 | * possible) function may be used. |
279 | */ |
280 | |
281 | static int do_abort(struct Scsi_Host *host); |
282 | static void do_reset(struct Scsi_Host *host); |
283 | |
284 | /* |
285 | * initialize_SCp - init the scsi pointer field |
286 | * @cmd: command block to set up |
287 | * |
288 | * Set up the internal fields in the SCSI command. |
289 | */ |
290 | |
291 | static __inline__ void initialize_SCp(Scsi_Cmnd * cmd) |
292 | { |
293 | /* |
294 | * Initialize the Scsi Pointer field so that all of the commands in the |
295 | * various queues are valid. |
296 | */ |
297 | |
298 | if (scsi_bufflen(cmd)) { |
299 | cmd->SCp.buffer = scsi_sglist(cmd); |
300 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; |
301 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
302 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
303 | } else { |
304 | cmd->SCp.buffer = NULL; |
305 | cmd->SCp.buffers_residual = 0; |
306 | cmd->SCp.ptr = NULL; |
307 | cmd->SCp.this_residual = 0; |
308 | } |
309 | } |
310 | |
311 | /** |
312 | * NCR5380_poll_politely - wait for NCR5380 status bits |
313 | * @instance: controller to poll |
314 | * @reg: 5380 register to poll |
315 | * @bit: Bitmask to check |
316 | * @val: Value required to exit |
317 | * |
318 | * Polls the NCR5380 in a reasonably efficient manner waiting for |
319 | * an event to occur, after a short quick poll we begin giving the |
320 | * CPU back in non IRQ contexts |
321 | * |
322 | * Returns the value of the register or a negative error code. |
323 | */ |
324 | |
325 | static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t) |
326 | { |
327 | NCR5380_local_declare(); |
328 | int n = 500; /* At about 8uS a cycle for the cpu access */ |
329 | unsigned long end = jiffies + t; |
330 | int r; |
331 | |
332 | NCR5380_setup(instance); |
333 | |
334 | while( n-- > 0) |
335 | { |
336 | r = NCR5380_read(reg); |
337 | if((r & bit) == val) |
338 | return 0; |
339 | cpu_relax(); |
340 | } |
341 | |
342 | /* t time yet ? */ |
343 | while(time_before(jiffies, end)) |
344 | { |
345 | r = NCR5380_read(reg); |
346 | if((r & bit) == val) |
347 | return 0; |
348 | if(!in_interrupt()) |
349 | cond_resched(); |
350 | else |
351 | cpu_relax(); |
352 | } |
353 | return -ETIMEDOUT; |
354 | } |
355 | |
356 | static struct { |
357 | unsigned char value; |
358 | const char *name; |
359 | } phases[] __maybe_unused = { |
360 | {PHASE_DATAOUT, "DATAOUT"}, |
361 | {PHASE_DATAIN, "DATAIN"}, |
362 | {PHASE_CMDOUT, "CMDOUT"}, |
363 | {PHASE_STATIN, "STATIN"}, |
364 | {PHASE_MSGOUT, "MSGOUT"}, |
365 | {PHASE_MSGIN, "MSGIN"}, |
366 | {PHASE_UNKNOWN, "UNKNOWN"} |
367 | }; |
368 | |
369 | #if NDEBUG |
370 | static struct { |
371 | unsigned char mask; |
372 | const char *name; |
373 | } signals[] = { |
374 | {SR_DBP, "PARITY"}, |
375 | {SR_RST, "RST"}, |
376 | {SR_BSY, "BSY"}, |
377 | {SR_REQ, "REQ"}, |
378 | {SR_MSG, "MSG"}, |
379 | {SR_CD, "CD"}, |
380 | {SR_IO, "IO"}, |
381 | {SR_SEL, "SEL"}, |
382 | {0, NULL} |
383 | }, |
384 | basrs[] = { |
385 | {BASR_ATN, "ATN"}, |
386 | {BASR_ACK, "ACK"}, |
387 | {0, NULL} |
388 | }, |
389 | icrs[] = { |
390 | {ICR_ASSERT_RST, "ASSERT RST"}, |
391 | {ICR_ASSERT_ACK, "ASSERT ACK"}, |
392 | {ICR_ASSERT_BSY, "ASSERT BSY"}, |
393 | {ICR_ASSERT_SEL, "ASSERT SEL"}, |
394 | {ICR_ASSERT_ATN, "ASSERT ATN"}, |
395 | {ICR_ASSERT_DATA, "ASSERT DATA"}, |
396 | {0, NULL} |
397 | }, |
398 | mrs[] = { |
399 | {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, |
400 | {MR_TARGET, "MODE TARGET"}, |
401 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, |
402 | {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"}, |
403 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, |
404 | {MR_DMA_MODE, "MODE DMA"}, |
405 | {MR_ARBITRATE, "MODE ARBITRATION"}, |
406 | {0, NULL} |
407 | }; |
408 | |
409 | /** |
410 | * NCR5380_print - print scsi bus signals |
411 | * @instance: adapter state to dump |
412 | * |
413 | * Print the SCSI bus signals for debugging purposes |
414 | * |
415 | * Locks: caller holds hostdata lock (not essential) |
416 | */ |
417 | |
418 | static void NCR5380_print(struct Scsi_Host *instance) |
419 | { |
420 | NCR5380_local_declare(); |
421 | unsigned char status, data, basr, mr, icr, i; |
422 | NCR5380_setup(instance); |
423 | |
424 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); |
425 | status = NCR5380_read(STATUS_REG); |
426 | mr = NCR5380_read(MODE_REG); |
427 | icr = NCR5380_read(INITIATOR_COMMAND_REG); |
428 | basr = NCR5380_read(BUS_AND_STATUS_REG); |
429 | |
430 | printk("STATUS_REG: %02x ", status); |
431 | for (i = 0; signals[i].mask; ++i) |
432 | if (status & signals[i].mask) |
433 | printk(",%s", signals[i].name); |
434 | printk("\nBASR: %02x ", basr); |
435 | for (i = 0; basrs[i].mask; ++i) |
436 | if (basr & basrs[i].mask) |
437 | printk(",%s", basrs[i].name); |
438 | printk("\nICR: %02x ", icr); |
439 | for (i = 0; icrs[i].mask; ++i) |
440 | if (icr & icrs[i].mask) |
441 | printk(",%s", icrs[i].name); |
442 | printk("\nMODE: %02x ", mr); |
443 | for (i = 0; mrs[i].mask; ++i) |
444 | if (mr & mrs[i].mask) |
445 | printk(",%s", mrs[i].name); |
446 | printk("\n"); |
447 | } |
448 | |
449 | |
450 | /* |
451 | * NCR5380_print_phase - show SCSI phase |
452 | * @instance: adapter to dump |
453 | * |
454 | * Print the current SCSI phase for debugging purposes |
455 | * |
456 | * Locks: none |
457 | */ |
458 | |
459 | static void NCR5380_print_phase(struct Scsi_Host *instance) |
460 | { |
461 | NCR5380_local_declare(); |
462 | unsigned char status; |
463 | int i; |
464 | NCR5380_setup(instance); |
465 | |
466 | status = NCR5380_read(STATUS_REG); |
467 | if (!(status & SR_REQ)) |
468 | printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no); |
469 | else { |
470 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i); |
471 | printk("scsi%d : phase %s\n", instance->host_no, phases[i].name); |
472 | } |
473 | } |
474 | #endif |
475 | |
476 | /* |
477 | * These need tweaking, and would probably work best as per-device |
478 | * flags initialized differently for disk, tape, cd, etc devices. |
479 | * People with broken devices are free to experiment as to what gives |
480 | * the best results for them. |
481 | * |
482 | * USLEEP_SLEEP should be a minimum seek time. |
483 | * |
484 | * USLEEP_POLL should be a maximum rotational latency. |
485 | */ |
486 | #ifndef USLEEP_SLEEP |
487 | /* 20 ms (reasonable hard disk speed) */ |
488 | #define USLEEP_SLEEP (20*HZ/1000) |
489 | #endif |
490 | /* 300 RPM (floppy speed) */ |
491 | #ifndef USLEEP_POLL |
492 | #define USLEEP_POLL (200*HZ/1000) |
493 | #endif |
494 | #ifndef USLEEP_WAITLONG |
495 | /* RvC: (reasonable time to wait on select error) */ |
496 | #define USLEEP_WAITLONG USLEEP_SLEEP |
497 | #endif |
498 | |
499 | /* |
500 | * Function : int should_disconnect (unsigned char cmd) |
501 | * |
502 | * Purpose : decide whether a command would normally disconnect or |
503 | * not, since if it won't disconnect we should go to sleep. |
504 | * |
505 | * Input : cmd - opcode of SCSI command |
506 | * |
507 | * Returns : DISCONNECT_LONG if we should disconnect for a really long |
508 | * time (ie always, sleep, look for REQ active, sleep), |
509 | * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal |
510 | * time-to-data delay, DISCONNECT_NONE if this command would return |
511 | * immediately. |
512 | * |
513 | * Future sleep algorithms based on time to data can exploit |
514 | * something like this so they can differentiate between "normal" |
515 | * (ie, read, write, seek) and unusual commands (ie, * format). |
516 | * |
517 | * Note : We don't deal with commands that handle an immediate disconnect, |
518 | * |
519 | */ |
520 | |
521 | static int should_disconnect(unsigned char cmd) |
522 | { |
523 | switch (cmd) { |
524 | case READ_6: |
525 | case WRITE_6: |
526 | case SEEK_6: |
527 | case READ_10: |
528 | case WRITE_10: |
529 | case SEEK_10: |
530 | return DISCONNECT_TIME_TO_DATA; |
531 | case FORMAT_UNIT: |
532 | case SEARCH_HIGH: |
533 | case SEARCH_LOW: |
534 | case SEARCH_EQUAL: |
535 | return DISCONNECT_LONG; |
536 | default: |
537 | return DISCONNECT_NONE; |
538 | } |
539 | } |
540 | |
541 | static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout) |
542 | { |
543 | hostdata->time_expires = jiffies + timeout; |
544 | schedule_delayed_work(&hostdata->coroutine, timeout); |
545 | } |
546 | |
547 | |
548 | static int probe_irq __initdata = 0; |
549 | |
550 | /** |
551 | * probe_intr - helper for IRQ autoprobe |
552 | * @irq: interrupt number |
553 | * @dev_id: unused |
554 | * @regs: unused |
555 | * |
556 | * Set a flag to indicate the IRQ in question was received. This is |
557 | * used by the IRQ probe code. |
558 | */ |
559 | |
560 | static irqreturn_t __init probe_intr(int irq, void *dev_id) |
561 | { |
562 | probe_irq = irq; |
563 | return IRQ_HANDLED; |
564 | } |
565 | |
566 | /** |
567 | * NCR5380_probe_irq - find the IRQ of an NCR5380 |
568 | * @instance: NCR5380 controller |
569 | * @possible: bitmask of ISA IRQ lines |
570 | * |
571 | * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ |
572 | * and then looking to see what interrupt actually turned up. |
573 | * |
574 | * Locks: none, irqs must be enabled on entry |
575 | */ |
576 | |
577 | static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance, |
578 | int possible) |
579 | { |
580 | NCR5380_local_declare(); |
581 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
582 | unsigned long timeout; |
583 | int trying_irqs, i, mask; |
584 | NCR5380_setup(instance); |
585 | |
586 | for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1) |
587 | if ((mask & possible) && (request_irq(i, &probe_intr, IRQF_DISABLED, "NCR-probe", NULL) == 0)) |
588 | trying_irqs |= mask; |
589 | |
590 | timeout = jiffies + (250 * HZ / 1000); |
591 | probe_irq = SCSI_IRQ_NONE; |
592 | |
593 | /* |
594 | * A interrupt is triggered whenever BSY = false, SEL = true |
595 | * and a bit set in the SELECT_ENABLE_REG is asserted on the |
596 | * SCSI bus. |
597 | * |
598 | * Note that the bus is only driven when the phase control signals |
599 | * (I/O, C/D, and MSG) match those in the TCR, so we must reset that |
600 | * to zero. |
601 | */ |
602 | |
603 | NCR5380_write(TARGET_COMMAND_REG, 0); |
604 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
605 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
606 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL); |
607 | |
608 | while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout)) |
609 | schedule_timeout_uninterruptible(1); |
610 | |
611 | NCR5380_write(SELECT_ENABLE_REG, 0); |
612 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
613 | |
614 | for (i = 0, mask = 1; i < 16; ++i, mask <<= 1) |
615 | if (trying_irqs & mask) |
616 | free_irq(i, NULL); |
617 | |
618 | return probe_irq; |
619 | } |
620 | |
621 | /** |
622 | * NCR58380_print_options - show options |
623 | * @instance: unused for now |
624 | * |
625 | * Called by probe code indicating the NCR5380 driver options that |
626 | * were selected. At some point this will switch to runtime options |
627 | * read from the adapter in question |
628 | * |
629 | * Locks: none |
630 | */ |
631 | |
632 | static void __init __maybe_unused |
633 | NCR5380_print_options(struct Scsi_Host *instance) |
634 | { |
635 | printk(" generic options" |
636 | #ifdef AUTOPROBE_IRQ |
637 | " AUTOPROBE_IRQ" |
638 | #endif |
639 | #ifdef AUTOSENSE |
640 | " AUTOSENSE" |
641 | #endif |
642 | #ifdef DIFFERENTIAL |
643 | " DIFFERENTIAL" |
644 | #endif |
645 | #ifdef REAL_DMA |
646 | " REAL DMA" |
647 | #endif |
648 | #ifdef REAL_DMA_POLL |
649 | " REAL DMA POLL" |
650 | #endif |
651 | #ifdef PARITY |
652 | " PARITY" |
653 | #endif |
654 | #ifdef PSEUDO_DMA |
655 | " PSEUDO DMA" |
656 | #endif |
657 | #ifdef UNSAFE |
658 | " UNSAFE " |
659 | #endif |
660 | ); |
661 | printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP); |
662 | printk(" generic release=%d", NCR5380_PUBLIC_RELEASE); |
663 | if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) { |
664 | printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE); |
665 | } |
666 | } |
667 | |
668 | /** |
669 | * NCR5380_print_status - dump controller info |
670 | * @instance: controller to dump |
671 | * |
672 | * Print commands in the various queues, called from NCR5380_abort |
673 | * and NCR5380_debug to aid debugging. |
674 | * |
675 | * Locks: called functions disable irqs |
676 | */ |
677 | |
678 | static void NCR5380_print_status(struct Scsi_Host *instance) |
679 | { |
680 | NCR5380_dprint(NDEBUG_ANY, instance); |
681 | NCR5380_dprint_phase(NDEBUG_ANY, instance); |
682 | } |
683 | |
684 | /******************************************/ |
685 | /* |
686 | * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED] |
687 | * |
688 | * *buffer: I/O buffer |
689 | * **start: if inout == FALSE pointer into buffer where user read should start |
690 | * offset: current offset |
691 | * length: length of buffer |
692 | * hostno: Scsi_Host host_no |
693 | * inout: TRUE - user is writing; FALSE - user is reading |
694 | * |
695 | * Return the number of bytes read from or written |
696 | */ |
697 | |
698 | static int __maybe_unused NCR5380_write_info(struct Scsi_Host *instance, |
699 | char *buffer, int length) |
700 | { |
701 | #ifdef DTC_PUBLIC_RELEASE |
702 | dtc_wmaxi = dtc_maxi = 0; |
703 | #endif |
704 | #ifdef PAS16_PUBLIC_RELEASE |
705 | pas_wmaxi = pas_maxi = 0; |
706 | #endif |
707 | return (-ENOSYS); /* Currently this is a no-op */ |
708 | } |
709 | |
710 | #undef SPRINTF |
711 | #define SPRINTF(args...) seq_printf(m, ## args) |
712 | static |
713 | void lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, struct seq_file *m); |
714 | static |
715 | void lprint_command(unsigned char *cmd, struct seq_file *m); |
716 | static |
717 | void lprint_opcode(int opcode, struct seq_file *m); |
718 | |
719 | static int __maybe_unused NCR5380_show_info(struct seq_file *m, |
720 | struct Scsi_Host *instance) |
721 | { |
722 | struct NCR5380_hostdata *hostdata; |
723 | Scsi_Cmnd *ptr; |
724 | |
725 | hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
726 | |
727 | SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE); |
728 | if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) |
729 | SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE); |
730 | #ifdef DTC_PUBLIC_RELEASE |
731 | SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE); |
732 | #endif |
733 | #ifdef T128_PUBLIC_RELEASE |
734 | SPRINTF("T128 release %d", T128_PUBLIC_RELEASE); |
735 | #endif |
736 | #ifdef GENERIC_NCR5380_PUBLIC_RELEASE |
737 | SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE); |
738 | #endif |
739 | #ifdef PAS16_PUBLIC_RELEASE |
740 | SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE); |
741 | #endif |
742 | |
743 | SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base); |
744 | SPRINTF("io_port: %04x ", (int) instance->io_port); |
745 | if (instance->irq == SCSI_IRQ_NONE) |
746 | SPRINTF("IRQ: None.\n"); |
747 | else |
748 | SPRINTF("IRQ: %d.\n", instance->irq); |
749 | |
750 | #ifdef DTC_PUBLIC_RELEASE |
751 | SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi); |
752 | #endif |
753 | #ifdef PAS16_PUBLIC_RELEASE |
754 | SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi); |
755 | #endif |
756 | spin_lock_irq(instance->host_lock); |
757 | if (!hostdata->connected) |
758 | SPRINTF("scsi%d: no currently connected command\n", instance->host_no); |
759 | else |
760 | lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, m); |
761 | SPRINTF("scsi%d: issue_queue\n", instance->host_no); |
762 | for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) |
763 | lprint_Scsi_Cmnd(ptr, m); |
764 | |
765 | SPRINTF("scsi%d: disconnected_queue\n", instance->host_no); |
766 | for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) |
767 | lprint_Scsi_Cmnd(ptr, m); |
768 | spin_unlock_irq(instance->host_lock); |
769 | return 0; |
770 | } |
771 | |
772 | static void lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, struct seq_file *m) |
773 | { |
774 | SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun); |
775 | SPRINTF(" command = "); |
776 | lprint_command(cmd->cmnd, m); |
777 | } |
778 | |
779 | static void lprint_command(unsigned char *command, struct seq_file *m) |
780 | { |
781 | int i, s; |
782 | lprint_opcode(command[0], m); |
783 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) |
784 | SPRINTF("%02x ", command[i]); |
785 | SPRINTF("\n"); |
786 | } |
787 | |
788 | static void lprint_opcode(int opcode, struct seq_file *m) |
789 | { |
790 | SPRINTF("%2d (0x%02x)", opcode, opcode); |
791 | } |
792 | |
793 | |
794 | /** |
795 | * NCR5380_init - initialise an NCR5380 |
796 | * @instance: adapter to configure |
797 | * @flags: control flags |
798 | * |
799 | * Initializes *instance and corresponding 5380 chip, |
800 | * with flags OR'd into the initial flags value. |
801 | * |
802 | * Notes : I assume that the host, hostno, and id bits have been |
803 | * set correctly. I don't care about the irq and other fields. |
804 | * |
805 | * Returns 0 for success |
806 | * |
807 | * Locks: interrupts must be enabled when we are called |
808 | */ |
809 | |
810 | static int NCR5380_init(struct Scsi_Host *instance, int flags) |
811 | { |
812 | NCR5380_local_declare(); |
813 | int i, pass; |
814 | unsigned long timeout; |
815 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
816 | |
817 | if(in_interrupt()) |
818 | printk(KERN_ERR "NCR5380_init called with interrupts off!\n"); |
819 | /* |
820 | * On NCR53C400 boards, NCR5380 registers are mapped 8 past |
821 | * the base address. |
822 | */ |
823 | |
824 | #ifdef NCR53C400 |
825 | if (flags & FLAG_NCR53C400) |
826 | instance->NCR5380_instance_name += NCR53C400_address_adjust; |
827 | #endif |
828 | |
829 | NCR5380_setup(instance); |
830 | |
831 | hostdata->aborted = 0; |
832 | hostdata->id_mask = 1 << instance->this_id; |
833 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) |
834 | if (i > hostdata->id_mask) |
835 | hostdata->id_higher_mask |= i; |
836 | for (i = 0; i < 8; ++i) |
837 | hostdata->busy[i] = 0; |
838 | #ifdef REAL_DMA |
839 | hostdata->dmalen = 0; |
840 | #endif |
841 | hostdata->targets_present = 0; |
842 | hostdata->connected = NULL; |
843 | hostdata->issue_queue = NULL; |
844 | hostdata->disconnected_queue = NULL; |
845 | |
846 | INIT_DELAYED_WORK(&hostdata->coroutine, NCR5380_main); |
847 | |
848 | #ifdef NCR5380_STATS |
849 | for (i = 0; i < 8; ++i) { |
850 | hostdata->time_read[i] = 0; |
851 | hostdata->time_write[i] = 0; |
852 | hostdata->bytes_read[i] = 0; |
853 | hostdata->bytes_write[i] = 0; |
854 | } |
855 | hostdata->timebase = 0; |
856 | hostdata->pendingw = 0; |
857 | hostdata->pendingr = 0; |
858 | #endif |
859 | |
860 | /* The CHECK code seems to break the 53C400. Will check it later maybe */ |
861 | if (flags & FLAG_NCR53C400) |
862 | hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags; |
863 | else |
864 | hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags; |
865 | |
866 | hostdata->host = instance; |
867 | hostdata->time_expires = 0; |
868 | |
869 | #ifndef AUTOSENSE |
870 | if ((instance->cmd_per_lun > 1) || instance->can_queue > 1) |
871 | printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n" |
872 | " be incorrectly cleared.\n", instance->host_no); |
873 | #endif /* def AUTOSENSE */ |
874 | |
875 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
876 | NCR5380_write(MODE_REG, MR_BASE); |
877 | NCR5380_write(TARGET_COMMAND_REG, 0); |
878 | NCR5380_write(SELECT_ENABLE_REG, 0); |
879 | |
880 | #ifdef NCR53C400 |
881 | if (hostdata->flags & FLAG_NCR53C400) { |
882 | NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE); |
883 | } |
884 | #endif |
885 | |
886 | /* |
887 | * Detect and correct bus wedge problems. |
888 | * |
889 | * If the system crashed, it may have crashed in a state |
890 | * where a SCSI command was still executing, and the |
891 | * SCSI bus is not in a BUS FREE STATE. |
892 | * |
893 | * If this is the case, we'll try to abort the currently |
894 | * established nexus which we know nothing about, and that |
895 | * failing, do a hard reset of the SCSI bus |
896 | */ |
897 | |
898 | for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { |
899 | switch (pass) { |
900 | case 1: |
901 | case 3: |
902 | case 5: |
903 | printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no); |
904 | timeout = jiffies + 5 * HZ; |
905 | NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ); |
906 | break; |
907 | case 2: |
908 | printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no); |
909 | do_abort(instance); |
910 | break; |
911 | case 4: |
912 | printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no); |
913 | do_reset(instance); |
914 | break; |
915 | case 6: |
916 | printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no); |
917 | return -ENXIO; |
918 | } |
919 | } |
920 | return 0; |
921 | } |
922 | |
923 | /** |
924 | * NCR5380_exit - remove an NCR5380 |
925 | * @instance: adapter to remove |
926 | */ |
927 | |
928 | static void NCR5380_exit(struct Scsi_Host *instance) |
929 | { |
930 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
931 | |
932 | cancel_delayed_work_sync(&hostdata->coroutine); |
933 | } |
934 | |
935 | /** |
936 | * NCR5380_queue_command - queue a command |
937 | * @cmd: SCSI command |
938 | * @done: completion handler |
939 | * |
940 | * cmd is added to the per instance issue_queue, with minor |
941 | * twiddling done to the host specific fields of cmd. If the |
942 | * main coroutine is not running, it is restarted. |
943 | * |
944 | * Locks: host lock taken by caller |
945 | */ |
946 | |
947 | static int NCR5380_queue_command_lck(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *)) |
948 | { |
949 | struct Scsi_Host *instance = cmd->device->host; |
950 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
951 | Scsi_Cmnd *tmp; |
952 | |
953 | #if (NDEBUG & NDEBUG_NO_WRITE) |
954 | switch (cmd->cmnd[0]) { |
955 | case WRITE_6: |
956 | case WRITE_10: |
957 | printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no); |
958 | cmd->result = (DID_ERROR << 16); |
959 | done(cmd); |
960 | return 0; |
961 | } |
962 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ |
963 | |
964 | #ifdef NCR5380_STATS |
965 | switch (cmd->cmnd[0]) { |
966 | case WRITE: |
967 | case WRITE_6: |
968 | case WRITE_10: |
969 | hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase); |
970 | hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd); |
971 | hostdata->pendingw++; |
972 | break; |
973 | case READ: |
974 | case READ_6: |
975 | case READ_10: |
976 | hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase); |
977 | hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd); |
978 | hostdata->pendingr++; |
979 | break; |
980 | } |
981 | #endif |
982 | |
983 | /* |
984 | * We use the host_scribble field as a pointer to the next command |
985 | * in a queue |
986 | */ |
987 | |
988 | cmd->host_scribble = NULL; |
989 | cmd->scsi_done = done; |
990 | cmd->result = 0; |
991 | |
992 | /* |
993 | * Insert the cmd into the issue queue. Note that REQUEST SENSE |
994 | * commands are added to the head of the queue since any command will |
995 | * clear the contingent allegiance condition that exists and the |
996 | * sense data is only guaranteed to be valid while the condition exists. |
997 | */ |
998 | |
999 | if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { |
1000 | LIST(cmd, hostdata->issue_queue); |
1001 | cmd->host_scribble = (unsigned char *) hostdata->issue_queue; |
1002 | hostdata->issue_queue = cmd; |
1003 | } else { |
1004 | for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble); |
1005 | LIST(cmd, tmp); |
1006 | tmp->host_scribble = (unsigned char *) cmd; |
1007 | } |
1008 | dprintk(NDEBUG_QUEUES, ("scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail")); |
1009 | |
1010 | /* Run the coroutine if it isn't already running. */ |
1011 | /* Kick off command processing */ |
1012 | schedule_delayed_work(&hostdata->coroutine, 0); |
1013 | return 0; |
1014 | } |
1015 | |
1016 | static DEF_SCSI_QCMD(NCR5380_queue_command) |
1017 | |
1018 | /** |
1019 | * NCR5380_main - NCR state machines |
1020 | * |
1021 | * NCR5380_main is a coroutine that runs as long as more work can |
1022 | * be done on the NCR5380 host adapters in a system. Both |
1023 | * NCR5380_queue_command() and NCR5380_intr() will try to start it |
1024 | * in case it is not running. |
1025 | * |
1026 | * Locks: called as its own thread with no locks held. Takes the |
1027 | * host lock and called routines may take the isa dma lock. |
1028 | */ |
1029 | |
1030 | static void NCR5380_main(struct work_struct *work) |
1031 | { |
1032 | struct NCR5380_hostdata *hostdata = |
1033 | container_of(work, struct NCR5380_hostdata, coroutine.work); |
1034 | struct Scsi_Host *instance = hostdata->host; |
1035 | Scsi_Cmnd *tmp, *prev; |
1036 | int done; |
1037 | |
1038 | spin_lock_irq(instance->host_lock); |
1039 | do { |
1040 | /* Lock held here */ |
1041 | done = 1; |
1042 | if (!hostdata->connected && !hostdata->selecting) { |
1043 | dprintk(NDEBUG_MAIN, ("scsi%d : not connected\n", instance->host_no)); |
1044 | /* |
1045 | * Search through the issue_queue for a command destined |
1046 | * for a target that's not busy. |
1047 | */ |
1048 | for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) |
1049 | { |
1050 | if (prev != tmp) |
1051 | dprintk(NDEBUG_LISTS, ("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun)); |
1052 | /* When we find one, remove it from the issue queue. */ |
1053 | if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) { |
1054 | if (prev) { |
1055 | REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); |
1056 | prev->host_scribble = tmp->host_scribble; |
1057 | } else { |
1058 | REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble); |
1059 | hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble; |
1060 | } |
1061 | tmp->host_scribble = NULL; |
1062 | |
1063 | /* |
1064 | * Attempt to establish an I_T_L nexus here. |
1065 | * On success, instance->hostdata->connected is set. |
1066 | * On failure, we must add the command back to the |
1067 | * issue queue so we can keep trying. |
1068 | */ |
1069 | dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main() : command for target %d lun %d removed from issue_queue\n", instance->host_no, tmp->target, tmp->lun)); |
1070 | |
1071 | /* |
1072 | * A successful selection is defined as one that |
1073 | * leaves us with the command connected and |
1074 | * in hostdata->connected, OR has terminated the |
1075 | * command. |
1076 | * |
1077 | * With successful commands, we fall through |
1078 | * and see if we can do an information transfer, |
1079 | * with failures we will restart. |
1080 | */ |
1081 | hostdata->selecting = NULL; |
1082 | /* RvC: have to preset this to indicate a new command is being performed */ |
1083 | |
1084 | if (!NCR5380_select(instance, tmp, |
1085 | /* |
1086 | * REQUEST SENSE commands are issued without tagged |
1087 | * queueing, even on SCSI-II devices because the |
1088 | * contingent allegiance condition exists for the |
1089 | * entire unit. |
1090 | */ |
1091 | (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { |
1092 | break; |
1093 | } else { |
1094 | LIST(tmp, hostdata->issue_queue); |
1095 | tmp->host_scribble = (unsigned char *) hostdata->issue_queue; |
1096 | hostdata->issue_queue = tmp; |
1097 | done = 0; |
1098 | dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no)); |
1099 | } |
1100 | /* lock held here still */ |
1101 | } /* if target/lun is not busy */ |
1102 | } /* for */ |
1103 | /* exited locked */ |
1104 | } /* if (!hostdata->connected) */ |
1105 | if (hostdata->selecting) { |
1106 | tmp = (Scsi_Cmnd *) hostdata->selecting; |
1107 | /* Selection will drop and retake the lock */ |
1108 | if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { |
1109 | /* Ok ?? */ |
1110 | } else { |
1111 | /* RvC: device failed, so we wait a long time |
1112 | this is needed for Mustek scanners, that |
1113 | do not respond to commands immediately |
1114 | after a scan */ |
1115 | printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id); |
1116 | LIST(tmp, hostdata->issue_queue); |
1117 | tmp->host_scribble = (unsigned char *) hostdata->issue_queue; |
1118 | hostdata->issue_queue = tmp; |
1119 | NCR5380_set_timer(hostdata, USLEEP_WAITLONG); |
1120 | } |
1121 | } /* if hostdata->selecting */ |
1122 | if (hostdata->connected |
1123 | #ifdef REAL_DMA |
1124 | && !hostdata->dmalen |
1125 | #endif |
1126 | && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies)) |
1127 | ) { |
1128 | dprintk(NDEBUG_MAIN, ("scsi%d : main() : performing information transfer\n", instance->host_no)); |
1129 | NCR5380_information_transfer(instance); |
1130 | dprintk(NDEBUG_MAIN, ("scsi%d : main() : done set false\n", instance->host_no)); |
1131 | done = 0; |
1132 | } else |
1133 | break; |
1134 | } while (!done); |
1135 | |
1136 | spin_unlock_irq(instance->host_lock); |
1137 | } |
1138 | |
1139 | #ifndef DONT_USE_INTR |
1140 | |
1141 | /** |
1142 | * NCR5380_intr - generic NCR5380 irq handler |
1143 | * @irq: interrupt number |
1144 | * @dev_id: device info |
1145 | * |
1146 | * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses |
1147 | * from the disconnected queue, and restarting NCR5380_main() |
1148 | * as required. |
1149 | * |
1150 | * Locks: takes the needed instance locks |
1151 | */ |
1152 | |
1153 | static irqreturn_t NCR5380_intr(int dummy, void *dev_id) |
1154 | { |
1155 | NCR5380_local_declare(); |
1156 | struct Scsi_Host *instance = dev_id; |
1157 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
1158 | int done; |
1159 | unsigned char basr; |
1160 | unsigned long flags; |
1161 | |
1162 | dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n", |
1163 | instance->irq)); |
1164 | |
1165 | do { |
1166 | done = 1; |
1167 | spin_lock_irqsave(instance->host_lock, flags); |
1168 | /* Look for pending interrupts */ |
1169 | NCR5380_setup(instance); |
1170 | basr = NCR5380_read(BUS_AND_STATUS_REG); |
1171 | /* XXX dispatch to appropriate routine if found and done=0 */ |
1172 | if (basr & BASR_IRQ) { |
1173 | NCR5380_dprint(NDEBUG_INTR, instance); |
1174 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { |
1175 | done = 0; |
1176 | dprintk(NDEBUG_INTR, ("scsi%d : SEL interrupt\n", instance->host_no)); |
1177 | NCR5380_reselect(instance); |
1178 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1179 | } else if (basr & BASR_PARITY_ERROR) { |
1180 | dprintk(NDEBUG_INTR, ("scsi%d : PARITY interrupt\n", instance->host_no)); |
1181 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1182 | } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { |
1183 | dprintk(NDEBUG_INTR, ("scsi%d : RESET interrupt\n", instance->host_no)); |
1184 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1185 | } else { |
1186 | #if defined(REAL_DMA) |
1187 | /* |
1188 | * We should only get PHASE MISMATCH and EOP interrupts |
1189 | * if we have DMA enabled, so do a sanity check based on |
1190 | * the current setting of the MODE register. |
1191 | */ |
1192 | |
1193 | if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) { |
1194 | int transferred; |
1195 | |
1196 | if (!hostdata->connected) |
1197 | panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno); |
1198 | |
1199 | transferred = (hostdata->dmalen - NCR5380_dma_residual(instance)); |
1200 | hostdata->connected->SCp.this_residual -= transferred; |
1201 | hostdata->connected->SCp.ptr += transferred; |
1202 | hostdata->dmalen = 0; |
1203 | |
1204 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1205 | |
1206 | /* FIXME: we need to poll briefly then defer a workqueue task ! */ |
1207 | NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ); |
1208 | |
1209 | NCR5380_write(MODE_REG, MR_BASE); |
1210 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
1211 | } |
1212 | #else |
1213 | dprintk(NDEBUG_INTR, ("scsi : unknown interrupt, BASR 0x%X, MR 0x%X, SR 0x%x\n", basr, NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG))); |
1214 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1215 | #endif |
1216 | } |
1217 | } /* if BASR_IRQ */ |
1218 | spin_unlock_irqrestore(instance->host_lock, flags); |
1219 | if(!done) |
1220 | schedule_delayed_work(&hostdata->coroutine, 0); |
1221 | } while (!done); |
1222 | return IRQ_HANDLED; |
1223 | } |
1224 | |
1225 | #endif |
1226 | |
1227 | /** |
1228 | * collect_stats - collect stats on a scsi command |
1229 | * @hostdata: adapter |
1230 | * @cmd: command being issued |
1231 | * |
1232 | * Update the statistical data by parsing the command in question |
1233 | */ |
1234 | |
1235 | static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd) |
1236 | { |
1237 | #ifdef NCR5380_STATS |
1238 | switch (cmd->cmnd[0]) { |
1239 | case WRITE: |
1240 | case WRITE_6: |
1241 | case WRITE_10: |
1242 | hostdata->time_write[scmd_id(cmd)] += (jiffies - hostdata->timebase); |
1243 | hostdata->pendingw--; |
1244 | break; |
1245 | case READ: |
1246 | case READ_6: |
1247 | case READ_10: |
1248 | hostdata->time_read[scmd_id(cmd)] += (jiffies - hostdata->timebase); |
1249 | hostdata->pendingr--; |
1250 | break; |
1251 | } |
1252 | #endif |
1253 | } |
1254 | |
1255 | |
1256 | /* |
1257 | * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, |
1258 | * int tag); |
1259 | * |
1260 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, |
1261 | * including ARBITRATION, SELECTION, and initial message out for |
1262 | * IDENTIFY and queue messages. |
1263 | * |
1264 | * Inputs : instance - instantiation of the 5380 driver on which this |
1265 | * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for |
1266 | * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for |
1267 | * the command that is presently connected. |
1268 | * |
1269 | * Returns : -1 if selection could not execute for some reason, |
1270 | * 0 if selection succeeded or failed because the target |
1271 | * did not respond. |
1272 | * |
1273 | * Side effects : |
1274 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit |
1275 | * with registers as they should have been on entry - ie |
1276 | * SELECT_ENABLE will be set appropriately, the NCR5380 |
1277 | * will cease to drive any SCSI bus signals. |
1278 | * |
1279 | * If successful : I_T_L or I_T_L_Q nexus will be established, |
1280 | * instance->connected will be set to cmd. |
1281 | * SELECT interrupt will be disabled. |
1282 | * |
1283 | * If failed (no target) : cmd->scsi_done() will be called, and the |
1284 | * cmd->result host byte set to DID_BAD_TARGET. |
1285 | * |
1286 | * Locks: caller holds hostdata lock in IRQ mode |
1287 | */ |
1288 | |
1289 | static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag) |
1290 | { |
1291 | NCR5380_local_declare(); |
1292 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
1293 | unsigned char tmp[3], phase; |
1294 | unsigned char *data; |
1295 | int len; |
1296 | unsigned long timeout; |
1297 | unsigned char value; |
1298 | int err; |
1299 | NCR5380_setup(instance); |
1300 | |
1301 | if (hostdata->selecting) |
1302 | goto part2; |
1303 | |
1304 | hostdata->restart_select = 0; |
1305 | |
1306 | NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
1307 | dprintk(NDEBUG_ARBITRATION, ("scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id)); |
1308 | |
1309 | /* |
1310 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the |
1311 | * data bus during SELECTION. |
1312 | */ |
1313 | |
1314 | NCR5380_write(TARGET_COMMAND_REG, 0); |
1315 | |
1316 | /* |
1317 | * Start arbitration. |
1318 | */ |
1319 | |
1320 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
1321 | NCR5380_write(MODE_REG, MR_ARBITRATE); |
1322 | |
1323 | |
1324 | /* We can be relaxed here, interrupts are on, we are |
1325 | in workqueue context, the birds are singing in the trees */ |
1326 | spin_unlock_irq(instance->host_lock); |
1327 | err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ); |
1328 | spin_lock_irq(instance->host_lock); |
1329 | if (err < 0) { |
1330 | printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__); |
1331 | NCR5380_write(MODE_REG, MR_BASE); |
1332 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
1333 | goto failed; |
1334 | } |
1335 | |
1336 | dprintk(NDEBUG_ARBITRATION, ("scsi%d : arbitration complete\n", instance->host_no)); |
1337 | |
1338 | /* |
1339 | * The arbitration delay is 2.2us, but this is a minimum and there is |
1340 | * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate |
1341 | * the integral nature of udelay(). |
1342 | * |
1343 | */ |
1344 | |
1345 | udelay(3); |
1346 | |
1347 | /* Check for lost arbitration */ |
1348 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { |
1349 | NCR5380_write(MODE_REG, MR_BASE); |
1350 | dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no)); |
1351 | goto failed; |
1352 | } |
1353 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL); |
1354 | |
1355 | if (!(hostdata->flags & FLAG_DTC3181E) && |
1356 | /* RvC: DTC3181E has some trouble with this |
1357 | * so we simply removed it. Seems to work with |
1358 | * only Mustek scanner attached |
1359 | */ |
1360 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { |
1361 | NCR5380_write(MODE_REG, MR_BASE); |
1362 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
1363 | dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no)); |
1364 | goto failed; |
1365 | } |
1366 | /* |
1367 | * Again, bus clear + bus settle time is 1.2us, however, this is |
1368 | * a minimum so we'll udelay ceil(1.2) |
1369 | */ |
1370 | |
1371 | udelay(2); |
1372 | |
1373 | dprintk(NDEBUG_ARBITRATION, ("scsi%d : won arbitration\n", instance->host_no)); |
1374 | |
1375 | /* |
1376 | * Now that we have won arbitration, start Selection process, asserting |
1377 | * the host and target ID's on the SCSI bus. |
1378 | */ |
1379 | |
1380 | NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd)))); |
1381 | |
1382 | /* |
1383 | * Raise ATN while SEL is true before BSY goes false from arbitration, |
1384 | * since this is the only way to guarantee that we'll get a MESSAGE OUT |
1385 | * phase immediately after selection. |
1386 | */ |
1387 | |
1388 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); |
1389 | NCR5380_write(MODE_REG, MR_BASE); |
1390 | |
1391 | /* |
1392 | * Reselect interrupts must be turned off prior to the dropping of BSY, |
1393 | * otherwise we will trigger an interrupt. |
1394 | */ |
1395 | NCR5380_write(SELECT_ENABLE_REG, 0); |
1396 | |
1397 | /* |
1398 | * The initiator shall then wait at least two deskew delays and release |
1399 | * the BSY signal. |
1400 | */ |
1401 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ |
1402 | |
1403 | /* Reset BSY */ |
1404 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); |
1405 | |
1406 | /* |
1407 | * Something weird happens when we cease to drive BSY - looks |
1408 | * like the board/chip is letting us do another read before the |
1409 | * appropriate propagation delay has expired, and we're confusing |
1410 | * a BSY signal from ourselves as the target's response to SELECTION. |
1411 | * |
1412 | * A small delay (the 'C++' frontend breaks the pipeline with an |
1413 | * unnecessary jump, making it work on my 386-33/Trantor T128, the |
1414 | * tighter 'C' code breaks and requires this) solves the problem - |
1415 | * the 1 us delay is arbitrary, and only used because this delay will |
1416 | * be the same on other platforms and since it works here, it should |
1417 | * work there. |
1418 | * |
1419 | * wingel suggests that this could be due to failing to wait |
1420 | * one deskew delay. |
1421 | */ |
1422 | |
1423 | udelay(1); |
1424 | |
1425 | dprintk(NDEBUG_SELECTION, ("scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd))); |
1426 | |
1427 | /* |
1428 | * The SCSI specification calls for a 250 ms timeout for the actual |
1429 | * selection. |
1430 | */ |
1431 | |
1432 | timeout = jiffies + (250 * HZ / 1000); |
1433 | |
1434 | /* |
1435 | * XXX very interesting - we're seeing a bounce where the BSY we |
1436 | * asserted is being reflected / still asserted (propagation delay?) |
1437 | * and it's detecting as true. Sigh. |
1438 | */ |
1439 | |
1440 | hostdata->select_time = 0; /* we count the clock ticks at which we polled */ |
1441 | hostdata->selecting = cmd; |
1442 | |
1443 | part2: |
1444 | /* RvC: here we enter after a sleeping period, or immediately after |
1445 | execution of part 1 |
1446 | we poll only once ech clock tick */ |
1447 | value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO); |
1448 | |
1449 | if (!value && (hostdata->select_time < HZ/4)) { |
1450 | /* RvC: we still must wait for a device response */ |
1451 | hostdata->select_time++; /* after 25 ticks the device has failed */ |
1452 | NCR5380_set_timer(hostdata, 1); |
1453 | return 0; /* RvC: we return here with hostdata->selecting set, |
1454 | to go to sleep */ |
1455 | } |
1456 | |
1457 | hostdata->selecting = NULL;/* clear this pointer, because we passed the |
1458 | waiting period */ |
1459 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { |
1460 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
1461 | NCR5380_reselect(instance); |
1462 | printk("scsi%d : reselection after won arbitration?\n", instance->host_no); |
1463 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
1464 | return -1; |
1465 | } |
1466 | /* |
1467 | * No less than two deskew delays after the initiator detects the |
1468 | * BSY signal is true, it shall release the SEL signal and may |
1469 | * change the DATA BUS. -wingel |
1470 | */ |
1471 | |
1472 | udelay(1); |
1473 | |
1474 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
1475 | |
1476 | if (!(NCR5380_read(STATUS_REG) & SR_BSY)) { |
1477 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
1478 | if (hostdata->targets_present & (1 << scmd_id(cmd))) { |
1479 | printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no); |
1480 | if (hostdata->restart_select) |
1481 | printk(KERN_DEBUG "\trestart select\n"); |
1482 | NCR5380_dprint(NDEBUG_SELECTION, instance); |
1483 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
1484 | return -1; |
1485 | } |
1486 | cmd->result = DID_BAD_TARGET << 16; |
1487 | collect_stats(hostdata, cmd); |
1488 | cmd->scsi_done(cmd); |
1489 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
1490 | dprintk(NDEBUG_SELECTION, ("scsi%d : target did not respond within 250ms\n", instance->host_no)); |
1491 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
1492 | return 0; |
1493 | } |
1494 | hostdata->targets_present |= (1 << scmd_id(cmd)); |
1495 | |
1496 | /* |
1497 | * Since we followed the SCSI spec, and raised ATN while SEL |
1498 | * was true but before BSY was false during selection, the information |
1499 | * transfer phase should be a MESSAGE OUT phase so that we can send the |
1500 | * IDENTIFY message. |
1501 | * |
1502 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG |
1503 | * message (2 bytes) with a tag ID that we increment with every command |
1504 | * until it wraps back to 0. |
1505 | * |
1506 | * XXX - it turns out that there are some broken SCSI-II devices, |
1507 | * which claim to support tagged queuing but fail when more than |
1508 | * some number of commands are issued at once. |
1509 | */ |
1510 | |
1511 | /* Wait for start of REQ/ACK handshake */ |
1512 | |
1513 | spin_unlock_irq(instance->host_lock); |
1514 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); |
1515 | spin_lock_irq(instance->host_lock); |
1516 | |
1517 | if(err) { |
1518 | printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__); |
1519 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
1520 | goto failed; |
1521 | } |
1522 | |
1523 | dprintk(NDEBUG_SELECTION, ("scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id)); |
1524 | tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun); |
1525 | |
1526 | len = 1; |
1527 | cmd->tag = 0; |
1528 | |
1529 | /* Send message(s) */ |
1530 | data = tmp; |
1531 | phase = PHASE_MSGOUT; |
1532 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
1533 | dprintk(NDEBUG_SELECTION, ("scsi%d : nexus established.\n", instance->host_no)); |
1534 | /* XXX need to handle errors here */ |
1535 | hostdata->connected = cmd; |
1536 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
1537 | |
1538 | initialize_SCp(cmd); |
1539 | |
1540 | return 0; |
1541 | |
1542 | /* Selection failed */ |
1543 | failed: |
1544 | return -1; |
1545 | |
1546 | } |
1547 | |
1548 | /* |
1549 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, |
1550 | * unsigned char *phase, int *count, unsigned char **data) |
1551 | * |
1552 | * Purpose : transfers data in given phase using polled I/O |
1553 | * |
1554 | * Inputs : instance - instance of driver, *phase - pointer to |
1555 | * what phase is expected, *count - pointer to number of |
1556 | * bytes to transfer, **data - pointer to data pointer. |
1557 | * |
1558 | * Returns : -1 when different phase is entered without transferring |
1559 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1560 | * is in same phase. |
1561 | * |
1562 | * Also, *phase, *count, *data are modified in place. |
1563 | * |
1564 | * XXX Note : handling for bus free may be useful. |
1565 | */ |
1566 | |
1567 | /* |
1568 | * Note : this code is not as quick as it could be, however it |
1569 | * IS 100% reliable, and for the actual data transfer where speed |
1570 | * counts, we will always do a pseudo DMA or DMA transfer. |
1571 | */ |
1572 | |
1573 | static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { |
1574 | NCR5380_local_declare(); |
1575 | unsigned char p = *phase, tmp; |
1576 | int c = *count; |
1577 | unsigned char *d = *data; |
1578 | /* |
1579 | * RvC: some administrative data to process polling time |
1580 | */ |
1581 | int break_allowed = 0; |
1582 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
1583 | NCR5380_setup(instance); |
1584 | |
1585 | if (!(p & SR_IO)) |
1586 | dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c)); |
1587 | else |
1588 | dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c)); |
1589 | |
1590 | /* |
1591 | * The NCR5380 chip will only drive the SCSI bus when the |
1592 | * phase specified in the appropriate bits of the TARGET COMMAND |
1593 | * REGISTER match the STATUS REGISTER |
1594 | */ |
1595 | |
1596 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1597 | |
1598 | /* RvC: don't know if this is necessary, but other SCSI I/O is short |
1599 | * so breaks are not necessary there |
1600 | */ |
1601 | if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) { |
1602 | break_allowed = 1; |
1603 | } |
1604 | do { |
1605 | /* |
1606 | * Wait for assertion of REQ, after which the phase bits will be |
1607 | * valid |
1608 | */ |
1609 | |
1610 | /* RvC: we simply poll once, after that we stop temporarily |
1611 | * and let the device buffer fill up |
1612 | * if breaking is not allowed, we keep polling as long as needed |
1613 | */ |
1614 | |
1615 | /* FIXME */ |
1616 | while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed); |
1617 | if (!(tmp & SR_REQ)) { |
1618 | /* timeout condition */ |
1619 | NCR5380_set_timer(hostdata, USLEEP_SLEEP); |
1620 | break; |
1621 | } |
1622 | |
1623 | dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no)); |
1624 | |
1625 | /* Check for phase mismatch */ |
1626 | if ((tmp & PHASE_MASK) != p) { |
1627 | dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no)); |
1628 | NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance); |
1629 | break; |
1630 | } |
1631 | /* Do actual transfer from SCSI bus to / from memory */ |
1632 | if (!(p & SR_IO)) |
1633 | NCR5380_write(OUTPUT_DATA_REG, *d); |
1634 | else |
1635 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); |
1636 | |
1637 | ++d; |
1638 | |
1639 | /* |
1640 | * The SCSI standard suggests that in MSGOUT phase, the initiator |
1641 | * should drop ATN on the last byte of the message phase |
1642 | * after REQ has been asserted for the handshake but before |
1643 | * the initiator raises ACK. |
1644 | */ |
1645 | |
1646 | if (!(p & SR_IO)) { |
1647 | if (!((p & SR_MSG) && c > 1)) { |
1648 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); |
1649 | NCR5380_dprint(NDEBUG_PIO, instance); |
1650 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK); |
1651 | } else { |
1652 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN); |
1653 | NCR5380_dprint(NDEBUG_PIO, instance); |
1654 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); |
1655 | } |
1656 | } else { |
1657 | NCR5380_dprint(NDEBUG_PIO, instance); |
1658 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
1659 | } |
1660 | |
1661 | /* FIXME - if this fails bus reset ?? */ |
1662 | NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ); |
1663 | dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no)); |
1664 | |
1665 | /* |
1666 | * We have several special cases to consider during REQ/ACK handshaking : |
1667 | * 1. We were in MSGOUT phase, and we are on the last byte of the |
1668 | * message. ATN must be dropped as ACK is dropped. |
1669 | * |
1670 | * 2. We are in a MSGIN phase, and we are on the last byte of the |
1671 | * message. We must exit with ACK asserted, so that the calling |
1672 | * code may raise ATN before dropping ACK to reject the message. |
1673 | * |
1674 | * 3. ACK and ATN are clear and the target may proceed as normal. |
1675 | */ |
1676 | if (!(p == PHASE_MSGIN && c == 1)) { |
1677 | if (p == PHASE_MSGOUT && c > 1) |
1678 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
1679 | else |
1680 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
1681 | } |
1682 | } while (--c); |
1683 | |
1684 | dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c)); |
1685 | |
1686 | *count = c; |
1687 | *data = d; |
1688 | tmp = NCR5380_read(STATUS_REG); |
1689 | if (tmp & SR_REQ) |
1690 | *phase = tmp & PHASE_MASK; |
1691 | else |
1692 | *phase = PHASE_UNKNOWN; |
1693 | |
1694 | if (!c || (*phase == p)) |
1695 | return 0; |
1696 | else |
1697 | return -1; |
1698 | } |
1699 | |
1700 | /** |
1701 | * do_reset - issue a reset command |
1702 | * @host: adapter to reset |
1703 | * |
1704 | * Issue a reset sequence to the NCR5380 and try and get the bus |
1705 | * back into sane shape. |
1706 | * |
1707 | * Locks: caller holds queue lock |
1708 | */ |
1709 | |
1710 | static void do_reset(struct Scsi_Host *host) { |
1711 | NCR5380_local_declare(); |
1712 | NCR5380_setup(host); |
1713 | |
1714 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); |
1715 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); |
1716 | udelay(25); |
1717 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
1718 | } |
1719 | |
1720 | /* |
1721 | * Function : do_abort (Scsi_Host *host) |
1722 | * |
1723 | * Purpose : abort the currently established nexus. Should only be |
1724 | * called from a routine which can drop into a |
1725 | * |
1726 | * Returns : 0 on success, -1 on failure. |
1727 | * |
1728 | * Locks: queue lock held by caller |
1729 | * FIXME: sort this out and get new_eh running |
1730 | */ |
1731 | |
1732 | static int do_abort(struct Scsi_Host *host) { |
1733 | NCR5380_local_declare(); |
1734 | unsigned char *msgptr, phase, tmp; |
1735 | int len; |
1736 | int rc; |
1737 | NCR5380_setup(host); |
1738 | |
1739 | |
1740 | /* Request message out phase */ |
1741 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
1742 | |
1743 | /* |
1744 | * Wait for the target to indicate a valid phase by asserting |
1745 | * REQ. Once this happens, we'll have either a MSGOUT phase |
1746 | * and can immediately send the ABORT message, or we'll have some |
1747 | * other phase and will have to source/sink data. |
1748 | * |
1749 | * We really don't care what value was on the bus or what value |
1750 | * the target sees, so we just handshake. |
1751 | */ |
1752 | |
1753 | rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ); |
1754 | |
1755 | if(rc < 0) |
1756 | return -1; |
1757 | |
1758 | tmp = (unsigned char)rc; |
1759 | |
1760 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); |
1761 | |
1762 | if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { |
1763 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); |
1764 | rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ); |
1765 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
1766 | if(rc == -1) |
1767 | return -1; |
1768 | } |
1769 | tmp = ABORT; |
1770 | msgptr = &tmp; |
1771 | len = 1; |
1772 | phase = PHASE_MSGOUT; |
1773 | NCR5380_transfer_pio(host, &phase, &len, &msgptr); |
1774 | |
1775 | /* |
1776 | * If we got here, and the command completed successfully, |
1777 | * we're about to go into bus free state. |
1778 | */ |
1779 | |
1780 | return len ? -1 : 0; |
1781 | } |
1782 | |
1783 | #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL) |
1784 | /* |
1785 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, |
1786 | * unsigned char *phase, int *count, unsigned char **data) |
1787 | * |
1788 | * Purpose : transfers data in given phase using either real |
1789 | * or pseudo DMA. |
1790 | * |
1791 | * Inputs : instance - instance of driver, *phase - pointer to |
1792 | * what phase is expected, *count - pointer to number of |
1793 | * bytes to transfer, **data - pointer to data pointer. |
1794 | * |
1795 | * Returns : -1 when different phase is entered without transferring |
1796 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1797 | * is in same phase. |
1798 | * |
1799 | * Also, *phase, *count, *data are modified in place. |
1800 | * |
1801 | * Locks: io_request lock held by caller |
1802 | */ |
1803 | |
1804 | |
1805 | static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { |
1806 | NCR5380_local_declare(); |
1807 | register int c = *count; |
1808 | register unsigned char p = *phase; |
1809 | register unsigned char *d = *data; |
1810 | unsigned char tmp; |
1811 | int foo; |
1812 | #if defined(REAL_DMA_POLL) |
1813 | int cnt, toPIO; |
1814 | unsigned char saved_data = 0, overrun = 0, residue; |
1815 | #endif |
1816 | |
1817 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
1818 | |
1819 | NCR5380_setup(instance); |
1820 | |
1821 | if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { |
1822 | *phase = tmp; |
1823 | return -1; |
1824 | } |
1825 | #if defined(REAL_DMA) || defined(REAL_DMA_POLL) |
1826 | #ifdef READ_OVERRUNS |
1827 | if (p & SR_IO) { |
1828 | c -= 2; |
1829 | } |
1830 | #endif |
1831 | dprintk(NDEBUG_DMA, ("scsi%d : initializing DMA channel %d for %s, %d bytes %s %0x\n", instance->host_no, instance->dma_channel, (p & SR_IO) ? "reading" : "writing", c, (p & SR_IO) ? "to" : "from", (unsigned) d)); |
1832 | hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c); |
1833 | #endif |
1834 | |
1835 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1836 | |
1837 | #ifdef REAL_DMA |
1838 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); |
1839 | #elif defined(REAL_DMA_POLL) |
1840 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); |
1841 | #else |
1842 | /* |
1843 | * Note : on my sample board, watch-dog timeouts occurred when interrupts |
1844 | * were not disabled for the duration of a single DMA transfer, from |
1845 | * before the setting of DMA mode to after transfer of the last byte. |
1846 | */ |
1847 | |
1848 | #if defined(PSEUDO_DMA) && defined(UNSAFE) |
1849 | spin_unlock_irq(instance->host_lock); |
1850 | #endif |
1851 | /* KLL May need eop and parity in 53c400 */ |
1852 | if (hostdata->flags & FLAG_NCR53C400) |
1853 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | |
1854 | MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR | |
1855 | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); |
1856 | else |
1857 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); |
1858 | #endif /* def REAL_DMA */ |
1859 | |
1860 | dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG))); |
1861 | |
1862 | /* |
1863 | * On the PAS16 at least I/O recovery delays are not needed here. |
1864 | * Everyone else seems to want them. |
1865 | */ |
1866 | |
1867 | if (p & SR_IO) { |
1868 | io_recovery_delay(1); |
1869 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); |
1870 | } else { |
1871 | io_recovery_delay(1); |
1872 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); |
1873 | io_recovery_delay(1); |
1874 | NCR5380_write(START_DMA_SEND_REG, 0); |
1875 | io_recovery_delay(1); |
1876 | } |
1877 | |
1878 | #if defined(REAL_DMA_POLL) |
1879 | do { |
1880 | tmp = NCR5380_read(BUS_AND_STATUS_REG); |
1881 | } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER))); |
1882 | |
1883 | /* |
1884 | At this point, either we've completed DMA, or we have a phase mismatch, |
1885 | or we've unexpectedly lost BUSY (which is a real error). |
1886 | |
1887 | For write DMAs, we want to wait until the last byte has been |
1888 | transferred out over the bus before we turn off DMA mode. Alas, there |
1889 | seems to be no terribly good way of doing this on a 5380 under all |
1890 | conditions. For non-scatter-gather operations, we can wait until REQ |
1891 | and ACK both go false, or until a phase mismatch occurs. Gather-writes |
1892 | are nastier, since the device will be expecting more data than we |
1893 | are prepared to send it, and REQ will remain asserted. On a 53C8[01] we |
1894 | could test LAST BIT SENT to assure transfer (I imagine this is precisely |
1895 | why this signal was added to the newer chips) but on the older 538[01] |
1896 | this signal does not exist. The workaround for this lack is a watchdog; |
1897 | we bail out of the wait-loop after a modest amount of wait-time if |
1898 | the usual exit conditions are not met. Not a terribly clean or |
1899 | correct solution :-% |
1900 | |
1901 | Reads are equally tricky due to a nasty characteristic of the NCR5380. |
1902 | If the chip is in DMA mode for an READ, it will respond to a target's |
1903 | REQ by latching the SCSI data into the INPUT DATA register and asserting |
1904 | ACK, even if it has _already_ been notified by the DMA controller that |
1905 | the current DMA transfer has completed! If the NCR5380 is then taken |
1906 | out of DMA mode, this already-acknowledged byte is lost. |
1907 | |
1908 | This is not a problem for "one DMA transfer per command" reads, because |
1909 | the situation will never arise... either all of the data is DMA'ed |
1910 | properly, or the target switches to MESSAGE IN phase to signal a |
1911 | disconnection (either operation bringing the DMA to a clean halt). |
1912 | However, in order to handle scatter-reads, we must work around the |
1913 | problem. The chosen fix is to DMA N-2 bytes, then check for the |
1914 | condition before taking the NCR5380 out of DMA mode. One or two extra |
1915 | bytes are transferred via PIO as necessary to fill out the original |
1916 | request. |
1917 | */ |
1918 | |
1919 | if (p & SR_IO) { |
1920 | #ifdef READ_OVERRUNS |
1921 | udelay(10); |
1922 | if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) { |
1923 | saved_data = NCR5380_read(INPUT_DATA_REGISTER); |
1924 | overrun = 1; |
1925 | } |
1926 | #endif |
1927 | } else { |
1928 | int limit = 100; |
1929 | while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) { |
1930 | if (!(tmp & BASR_PHASE_MATCH)) |
1931 | break; |
1932 | if (--limit < 0) |
1933 | break; |
1934 | } |
1935 | } |
1936 | |
1937 | dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG))); |
1938 | |
1939 | NCR5380_write(MODE_REG, MR_BASE); |
1940 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
1941 | |
1942 | residue = NCR5380_dma_residual(instance); |
1943 | c -= residue; |
1944 | *count -= c; |
1945 | *data += c; |
1946 | *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; |
1947 | |
1948 | #ifdef READ_OVERRUNS |
1949 | if (*phase == p && (p & SR_IO) && residue == 0) { |
1950 | if (overrun) { |
1951 | dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n")); |
1952 | **data = saved_data; |
1953 | *data += 1; |
1954 | *count -= 1; |
1955 | cnt = toPIO = 1; |
1956 | } else { |
1957 | printk("No overrun??\n"); |
1958 | cnt = toPIO = 2; |
1959 | } |
1960 | dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data)); |
1961 | NCR5380_transfer_pio(instance, phase, &cnt, data); |
1962 | *count -= toPIO - cnt; |
1963 | } |
1964 | #endif |
1965 | |
1966 | dprintk(NDEBUG_DMA, ("Return with data ptr = 0x%X, count %d, last 0x%X, next 0x%X\n", *data, *count, *(*data + *count - 1), *(*data + *count))); |
1967 | return 0; |
1968 | |
1969 | #elif defined(REAL_DMA) |
1970 | return 0; |
1971 | #else /* defined(REAL_DMA_POLL) */ |
1972 | if (p & SR_IO) { |
1973 | #ifdef DMA_WORKS_RIGHT |
1974 | foo = NCR5380_pread(instance, d, c); |
1975 | #else |
1976 | int diff = 1; |
1977 | if (hostdata->flags & FLAG_NCR53C400) { |
1978 | diff = 0; |
1979 | } |
1980 | if (!(foo = NCR5380_pread(instance, d, c - diff))) { |
1981 | /* |
1982 | * We can't disable DMA mode after successfully transferring |
1983 | * what we plan to be the last byte, since that would open up |
1984 | * a race condition where if the target asserted REQ before |
1985 | * we got the DMA mode reset, the NCR5380 would have latched |
1986 | * an additional byte into the INPUT DATA register and we'd |
1987 | * have dropped it. |
1988 | * |
1989 | * The workaround was to transfer one fewer bytes than we |
1990 | * intended to with the pseudo-DMA read function, wait for |
1991 | * the chip to latch the last byte, read it, and then disable |
1992 | * pseudo-DMA mode. |
1993 | * |
1994 | * After REQ is asserted, the NCR5380 asserts DRQ and ACK. |
1995 | * REQ is deasserted when ACK is asserted, and not reasserted |
1996 | * until ACK goes false. Since the NCR5380 won't lower ACK |
1997 | * until DACK is asserted, which won't happen unless we twiddle |
1998 | * the DMA port or we take the NCR5380 out of DMA mode, we |
1999 | * can guarantee that we won't handshake another extra |
2000 | * byte. |
2001 | */ |
2002 | |
2003 | if (!(hostdata->flags & FLAG_NCR53C400)) { |
2004 | while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)); |
2005 | /* Wait for clean handshake */ |
2006 | while (NCR5380_read(STATUS_REG) & SR_REQ); |
2007 | d[c - 1] = NCR5380_read(INPUT_DATA_REG); |
2008 | } |
2009 | } |
2010 | #endif |
2011 | } else { |
2012 | #ifdef DMA_WORKS_RIGHT |
2013 | foo = NCR5380_pwrite(instance, d, c); |
2014 | #else |
2015 | int timeout; |
2016 | dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c)); |
2017 | if (!(foo = NCR5380_pwrite(instance, d, c))) { |
2018 | /* |
2019 | * Wait for the last byte to be sent. If REQ is being asserted for |
2020 | * the byte we're interested, we'll ACK it and it will go false. |
2021 | */ |
2022 | if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) { |
2023 | timeout = 20000; |
2024 | while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)); |
2025 | |
2026 | if (!timeout) |
2027 | dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no)); |
2028 | |
2029 | if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) { |
2030 | hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT; |
2031 | if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) { |
2032 | hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT; |
2033 | dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no)); |
2034 | } |
2035 | } |
2036 | } else { |
2037 | dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n")); |
2038 | while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT)); |
2039 | dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n")); |
2040 | } |
2041 | } |
2042 | #endif |
2043 | } |
2044 | NCR5380_write(MODE_REG, MR_BASE); |
2045 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2046 | |
2047 | if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) { |
2048 | dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n")); |
2049 | if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) { |
2050 | dprintk(NDEBUG_C400_PWRITE, ("53C400w: got it, reading reset interrupt reg\n")); |
2051 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
2052 | } else { |
2053 | printk("53C400w: IRQ NOT THERE!\n"); |
2054 | } |
2055 | } |
2056 | *data = d + c; |
2057 | *count = 0; |
2058 | *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; |
2059 | #if defined(PSEUDO_DMA) && defined(UNSAFE) |
2060 | spin_lock_irq(instance->host_lock); |
2061 | #endif /* defined(REAL_DMA_POLL) */ |
2062 | return foo; |
2063 | #endif /* def REAL_DMA */ |
2064 | } |
2065 | #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */ |
2066 | |
2067 | /* |
2068 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) |
2069 | * |
2070 | * Purpose : run through the various SCSI phases and do as the target |
2071 | * directs us to. Operates on the currently connected command, |
2072 | * instance->connected. |
2073 | * |
2074 | * Inputs : instance, instance for which we are doing commands |
2075 | * |
2076 | * Side effects : SCSI things happen, the disconnected queue will be |
2077 | * modified if a command disconnects, *instance->connected will |
2078 | * change. |
2079 | * |
2080 | * XXX Note : we need to watch for bus free or a reset condition here |
2081 | * to recover from an unexpected bus free condition. |
2082 | * |
2083 | * Locks: io_request_lock held by caller in IRQ mode |
2084 | */ |
2085 | |
2086 | static void NCR5380_information_transfer(struct Scsi_Host *instance) { |
2087 | NCR5380_local_declare(); |
2088 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata; |
2089 | unsigned char msgout = NOP; |
2090 | int sink = 0; |
2091 | int len; |
2092 | #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) |
2093 | int transfersize; |
2094 | #endif |
2095 | unsigned char *data; |
2096 | unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; |
2097 | Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected; |
2098 | /* RvC: we need to set the end of the polling time */ |
2099 | unsigned long poll_time = jiffies + USLEEP_POLL; |
2100 | |
2101 | NCR5380_setup(instance); |
2102 | |
2103 | while (1) { |
2104 | tmp = NCR5380_read(STATUS_REG); |
2105 | /* We only have a valid SCSI phase when REQ is asserted */ |
2106 | if (tmp & SR_REQ) { |
2107 | phase = (tmp & PHASE_MASK); |
2108 | if (phase != old_phase) { |
2109 | old_phase = phase; |
2110 | NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); |
2111 | } |
2112 | if (sink && (phase != PHASE_MSGOUT)) { |
2113 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); |
2114 | |
2115 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); |
2116 | while (NCR5380_read(STATUS_REG) & SR_REQ); |
2117 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
2118 | sink = 0; |
2119 | continue; |
2120 | } |
2121 | switch (phase) { |
2122 | case PHASE_DATAIN: |
2123 | case PHASE_DATAOUT: |
2124 | #if (NDEBUG & NDEBUG_NO_DATAOUT) |
2125 | printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no); |
2126 | sink = 1; |
2127 | do_abort(instance); |
2128 | cmd->result = DID_ERROR << 16; |
2129 | cmd->scsi_done(cmd); |
2130 | return; |
2131 | #endif |
2132 | /* |
2133 | * If there is no room left in the current buffer in the |
2134 | * scatter-gather list, move onto the next one. |
2135 | */ |
2136 | |
2137 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { |
2138 | ++cmd->SCp.buffer; |
2139 | --cmd->SCp.buffers_residual; |
2140 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
2141 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
2142 | dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual)); |
2143 | } |
2144 | /* |
2145 | * The preferred transfer method is going to be |
2146 | * PSEUDO-DMA for systems that are strictly PIO, |
2147 | * since we can let the hardware do the handshaking. |
2148 | * |
2149 | * For this to work, we need to know the transfersize |
2150 | * ahead of time, since the pseudo-DMA code will sit |
2151 | * in an unconditional loop. |
2152 | */ |
2153 | |
2154 | #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) |
2155 | /* KLL |
2156 | * PSEUDO_DMA is defined here. If this is the g_NCR5380 |
2157 | * driver then it will always be defined, so the |
2158 | * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base |
2159 | * NCR5380 case. I think this is a fairly clean solution. |
2160 | * We supplement these 2 if's with the flag. |
2161 | */ |
2162 | #ifdef NCR5380_dma_xfer_len |
2163 | if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) { |
2164 | #else |
2165 | transfersize = cmd->transfersize; |
2166 | |
2167 | #ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */ |
2168 | if (transfersize > 512) |
2169 | transfersize = 512; |
2170 | #endif /* LIMIT_TRANSFERSIZE */ |
2171 | |
2172 | if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) { |
2173 | /* Limit transfers to 32K, for xx400 & xx406 |
2174 | * pseudoDMA that transfers in 128 bytes blocks. */ |
2175 | if (transfersize > 32 * 1024) |
2176 | transfersize = 32 * 1024; |
2177 | #endif |
2178 | len = transfersize; |
2179 | if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) { |
2180 | /* |
2181 | * If the watchdog timer fires, all future accesses to this |
2182 | * device will use the polled-IO. |
2183 | */ |
2184 | scmd_printk(KERN_INFO, cmd, |
2185 | "switching to slow handshake\n"); |
2186 | cmd->device->borken = 1; |
2187 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
2188 | sink = 1; |
2189 | do_abort(instance); |
2190 | cmd->result = DID_ERROR << 16; |
2191 | cmd->scsi_done(cmd); |
2192 | /* XXX - need to source or sink data here, as appropriate */ |
2193 | } else |
2194 | cmd->SCp.this_residual -= transfersize - len; |
2195 | } else |
2196 | #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */ |
2197 | NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **) |
2198 | &cmd->SCp.ptr); |
2199 | break; |
2200 | case PHASE_MSGIN: |
2201 | len = 1; |
2202 | data = &tmp; |
2203 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
2204 | cmd->SCp.Message = tmp; |
2205 | |
2206 | switch (tmp) { |
2207 | /* |
2208 | * Linking lets us reduce the time required to get the |
2209 | * next command out to the device, hopefully this will |
2210 | * mean we don't waste another revolution due to the delays |
2211 | * required by ARBITRATION and another SELECTION. |
2212 | * |
2213 | * In the current implementation proposal, low level drivers |
2214 | * merely have to start the next command, pointed to by |
2215 | * next_link, done() is called as with unlinked commands. |
2216 | */ |
2217 | #ifdef LINKED |
2218 | case LINKED_CMD_COMPLETE: |
2219 | case LINKED_FLG_CMD_COMPLETE: |
2220 | /* Accept message by clearing ACK */ |
2221 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2222 | dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun)); |
2223 | /* |
2224 | * Sanity check : A linked command should only terminate with |
2225 | * one of these messages if there are more linked commands |
2226 | * available. |
2227 | */ |
2228 | if (!cmd->next_link) { |
2229 | printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun); |
2230 | sink = 1; |
2231 | do_abort(instance); |
2232 | return; |
2233 | } |
2234 | initialize_SCp(cmd->next_link); |
2235 | /* The next command is still part of this process */ |
2236 | cmd->next_link->tag = cmd->tag; |
2237 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); |
2238 | dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun)); |
2239 | collect_stats(hostdata, cmd); |
2240 | cmd->scsi_done(cmd); |
2241 | cmd = hostdata->connected; |
2242 | break; |
2243 | #endif /* def LINKED */ |
2244 | case ABORT: |
2245 | case COMMAND_COMPLETE: |
2246 | /* Accept message by clearing ACK */ |
2247 | sink = 1; |
2248 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2249 | hostdata->connected = NULL; |
2250 | dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun)); |
2251 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
2252 | |
2253 | /* |
2254 | * I'm not sure what the correct thing to do here is : |
2255 | * |
2256 | * If the command that just executed is NOT a request |
2257 | * sense, the obvious thing to do is to set the result |
2258 | * code to the values of the stored parameters. |
2259 | * |
2260 | * If it was a REQUEST SENSE command, we need some way |
2261 | * to differentiate between the failure code of the original |
2262 | * and the failure code of the REQUEST sense - the obvious |
2263 | * case is success, where we fall through and leave the result |
2264 | * code unchanged. |
2265 | * |
2266 | * The non-obvious place is where the REQUEST SENSE failed |
2267 | */ |
2268 | |
2269 | if (cmd->cmnd[0] != REQUEST_SENSE) |
2270 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); |
2271 | else if (status_byte(cmd->SCp.Status) != GOOD) |
2272 | cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); |
2273 | |
2274 | #ifdef AUTOSENSE |
2275 | if ((cmd->cmnd[0] == REQUEST_SENSE) && |
2276 | hostdata->ses.cmd_len) { |
2277 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); |
2278 | hostdata->ses.cmd_len = 0 ; |
2279 | } |
2280 | |
2281 | if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { |
2282 | scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); |
2283 | |
2284 | dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no)); |
2285 | |
2286 | LIST(cmd, hostdata->issue_queue); |
2287 | cmd->host_scribble = (unsigned char *) |
2288 | hostdata->issue_queue; |
2289 | hostdata->issue_queue = (Scsi_Cmnd *) cmd; |
2290 | dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no)); |
2291 | } else |
2292 | #endif /* def AUTOSENSE */ |
2293 | { |
2294 | collect_stats(hostdata, cmd); |
2295 | cmd->scsi_done(cmd); |
2296 | } |
2297 | |
2298 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
2299 | /* |
2300 | * Restore phase bits to 0 so an interrupted selection, |
2301 | * arbitration can resume. |
2302 | */ |
2303 | NCR5380_write(TARGET_COMMAND_REG, 0); |
2304 | |
2305 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) |
2306 | barrier(); |
2307 | return; |
2308 | case MESSAGE_REJECT: |
2309 | /* Accept message by clearing ACK */ |
2310 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2311 | switch (hostdata->last_message) { |
2312 | case HEAD_OF_QUEUE_TAG: |
2313 | case ORDERED_QUEUE_TAG: |
2314 | case SIMPLE_QUEUE_TAG: |
2315 | cmd->device->simple_tags = 0; |
2316 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
2317 | break; |
2318 | default: |
2319 | break; |
2320 | } |
2321 | case DISCONNECT:{ |
2322 | /* Accept message by clearing ACK */ |
2323 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2324 | cmd->device->disconnect = 1; |
2325 | LIST(cmd, hostdata->disconnected_queue); |
2326 | cmd->host_scribble = (unsigned char *) |
2327 | hostdata->disconnected_queue; |
2328 | hostdata->connected = NULL; |
2329 | hostdata->disconnected_queue = cmd; |
2330 | dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d lun %d was moved from connected to" " the disconnected_queue\n", instance->host_no, cmd->device->id, cmd->device->lun)); |
2331 | /* |
2332 | * Restore phase bits to 0 so an interrupted selection, |
2333 | * arbitration can resume. |
2334 | */ |
2335 | NCR5380_write(TARGET_COMMAND_REG, 0); |
2336 | |
2337 | /* Enable reselect interrupts */ |
2338 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
2339 | /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/ |
2340 | /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */ |
2341 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) |
2342 | barrier(); |
2343 | return; |
2344 | } |
2345 | /* |
2346 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect |
2347 | * operation, in violation of the SCSI spec so we can safely |
2348 | * ignore SAVE/RESTORE pointers calls. |
2349 | * |
2350 | * Unfortunately, some disks violate the SCSI spec and |
2351 | * don't issue the required SAVE_POINTERS message before |
2352 | * disconnecting, and we have to break spec to remain |
2353 | * compatible. |
2354 | */ |
2355 | case SAVE_POINTERS: |
2356 | case RESTORE_POINTERS: |
2357 | /* Accept message by clearing ACK */ |
2358 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2359 | break; |
2360 | case EXTENDED_MESSAGE: |
2361 | /* |
2362 | * Extended messages are sent in the following format : |
2363 | * Byte |
2364 | * 0 EXTENDED_MESSAGE == 1 |
2365 | * 1 length (includes one byte for code, doesn't |
2366 | * include first two bytes) |
2367 | * 2 code |
2368 | * 3..length+1 arguments |
2369 | * |
2370 | * Start the extended message buffer with the EXTENDED_MESSAGE |
2371 | * byte, since spi_print_msg() wants the whole thing. |
2372 | */ |
2373 | extended_msg[0] = EXTENDED_MESSAGE; |
2374 | /* Accept first byte by clearing ACK */ |
2375 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2376 | dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no)); |
2377 | |
2378 | len = 2; |
2379 | data = extended_msg + 1; |
2380 | phase = PHASE_MSGIN; |
2381 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
2382 | |
2383 | dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2])); |
2384 | |
2385 | if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) { |
2386 | /* Accept third byte by clearing ACK */ |
2387 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2388 | len = extended_msg[1] - 1; |
2389 | data = extended_msg + 3; |
2390 | phase = PHASE_MSGIN; |
2391 | |
2392 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
2393 | dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len)); |
2394 | |
2395 | switch (extended_msg[2]) { |
2396 | case EXTENDED_SDTR: |
2397 | case EXTENDED_WDTR: |
2398 | case EXTENDED_MODIFY_DATA_POINTER: |
2399 | case EXTENDED_EXTENDED_IDENTIFY: |
2400 | tmp = 0; |
2401 | } |
2402 | } else if (len) { |
2403 | printk("scsi%d: error receiving extended message\n", instance->host_no); |
2404 | tmp = 0; |
2405 | } else { |
2406 | printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]); |
2407 | tmp = 0; |
2408 | } |
2409 | /* Fall through to reject message */ |
2410 | |
2411 | /* |
2412 | * If we get something weird that we aren't expecting, |
2413 | * reject it. |
2414 | */ |
2415 | default: |
2416 | if (!tmp) { |
2417 | printk("scsi%d: rejecting message ", instance->host_no); |
2418 | spi_print_msg(extended_msg); |
2419 | printk("\n"); |
2420 | } else if (tmp != EXTENDED_MESSAGE) |
2421 | scmd_printk(KERN_INFO, cmd, |
2422 | "rejecting unknown message %02x\n",tmp); |
2423 | else |
2424 | scmd_printk(KERN_INFO, cmd, |
2425 | "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]); |
2426 | |
2427 | msgout = MESSAGE_REJECT; |
2428 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
2429 | break; |
2430 | } /* switch (tmp) */ |
2431 | break; |
2432 | case PHASE_MSGOUT: |
2433 | len = 1; |
2434 | data = &msgout; |
2435 | hostdata->last_message = msgout; |
2436 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
2437 | if (msgout == ABORT) { |
2438 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
2439 | hostdata->connected = NULL; |
2440 | cmd->result = DID_ERROR << 16; |
2441 | collect_stats(hostdata, cmd); |
2442 | cmd->scsi_done(cmd); |
2443 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
2444 | return; |
2445 | } |
2446 | msgout = NOP; |
2447 | break; |
2448 | case PHASE_CMDOUT: |
2449 | len = cmd->cmd_len; |
2450 | data = cmd->cmnd; |
2451 | /* |
2452 | * XXX for performance reasons, on machines with a |
2453 | * PSEUDO-DMA architecture we should probably |
2454 | * use the dma transfer function. |
2455 | */ |
2456 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
2457 | if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) { |
2458 | NCR5380_set_timer(hostdata, USLEEP_SLEEP); |
2459 | dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); |
2460 | return; |
2461 | } |
2462 | break; |
2463 | case PHASE_STATIN: |
2464 | len = 1; |
2465 | data = &tmp; |
2466 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
2467 | cmd->SCp.Status = tmp; |
2468 | break; |
2469 | default: |
2470 | printk("scsi%d : unknown phase\n", instance->host_no); |
2471 | NCR5380_dprint(NDEBUG_ALL, instance); |
2472 | } /* switch(phase) */ |
2473 | } /* if (tmp * SR_REQ) */ |
2474 | else { |
2475 | /* RvC: go to sleep if polling time expired |
2476 | */ |
2477 | if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) { |
2478 | NCR5380_set_timer(hostdata, USLEEP_SLEEP); |
2479 | dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); |
2480 | return; |
2481 | } |
2482 | } |
2483 | } /* while (1) */ |
2484 | } |
2485 | |
2486 | /* |
2487 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) |
2488 | * |
2489 | * Purpose : does reselection, initializing the instance->connected |
2490 | * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q |
2491 | * nexus has been reestablished, |
2492 | * |
2493 | * Inputs : instance - this instance of the NCR5380. |
2494 | * |
2495 | * Locks: io_request_lock held by caller if IRQ driven |
2496 | */ |
2497 | |
2498 | static void NCR5380_reselect(struct Scsi_Host *instance) { |
2499 | NCR5380_local_declare(); |
2500 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) |
2501 | instance->hostdata; |
2502 | unsigned char target_mask; |
2503 | unsigned char lun, phase; |
2504 | int len; |
2505 | unsigned char msg[3]; |
2506 | unsigned char *data; |
2507 | Scsi_Cmnd *tmp = NULL, *prev; |
2508 | int abort = 0; |
2509 | NCR5380_setup(instance); |
2510 | |
2511 | /* |
2512 | * Disable arbitration, etc. since the host adapter obviously |
2513 | * lost, and tell an interrupted NCR5380_select() to restart. |
2514 | */ |
2515 | |
2516 | NCR5380_write(MODE_REG, MR_BASE); |
2517 | hostdata->restart_select = 1; |
2518 | |
2519 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); |
2520 | dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no)); |
2521 | |
2522 | /* |
2523 | * At this point, we have detected that our SCSI ID is on the bus, |
2524 | * SEL is true and BSY was false for at least one bus settle delay |
2525 | * (400 ns). |
2526 | * |
2527 | * We must assert BSY ourselves, until the target drops the SEL |
2528 | * signal. |
2529 | */ |
2530 | |
2531 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); |
2532 | |
2533 | /* FIXME: timeout too long, must fail to workqueue */ |
2534 | if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0) |
2535 | abort = 1; |
2536 | |
2537 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2538 | |
2539 | /* |
2540 | * Wait for target to go into MSGIN. |
2541 | * FIXME: timeout needed and fail to work queeu |
2542 | */ |
2543 | |
2544 | if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ)) |
2545 | abort = 1; |
2546 | |
2547 | len = 1; |
2548 | data = msg; |
2549 | phase = PHASE_MSGIN; |
2550 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
2551 | |
2552 | if (!(msg[0] & 0x80)) { |
2553 | printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no); |
2554 | spi_print_msg(msg); |
2555 | abort = 1; |
2556 | } else { |
2557 | /* Accept message by clearing ACK */ |
2558 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2559 | lun = (msg[0] & 0x07); |
2560 | |
2561 | /* |
2562 | * We need to add code for SCSI-II to track which devices have |
2563 | * I_T_L_Q nexuses established, and which have simple I_T_L |
2564 | * nexuses so we can chose to do additional data transfer. |
2565 | */ |
2566 | |
2567 | /* |
2568 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we |
2569 | * just reestablished, and remove it from the disconnected queue. |
2570 | */ |
2571 | |
2572 | |
2573 | for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) |
2574 | if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) |
2575 | ) { |
2576 | if (prev) { |
2577 | REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); |
2578 | prev->host_scribble = tmp->host_scribble; |
2579 | } else { |
2580 | REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble); |
2581 | hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble; |
2582 | } |
2583 | tmp->host_scribble = NULL; |
2584 | break; |
2585 | } |
2586 | if (!tmp) { |
2587 | printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun); |
2588 | /* |
2589 | * Since we have an established nexus that we can't do anything with, |
2590 | * we must abort it. |
2591 | */ |
2592 | abort = 1; |
2593 | } |
2594 | } |
2595 | |
2596 | if (abort) { |
2597 | do_abort(instance); |
2598 | } else { |
2599 | hostdata->connected = tmp; |
2600 | dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag)); |
2601 | } |
2602 | } |
2603 | |
2604 | /* |
2605 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) |
2606 | * |
2607 | * Purpose : called by interrupt handler when DMA finishes or a phase |
2608 | * mismatch occurs (which would finish the DMA transfer). |
2609 | * |
2610 | * Inputs : instance - this instance of the NCR5380. |
2611 | * |
2612 | * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L |
2613 | * nexus has been reestablished, on failure NULL is returned. |
2614 | */ |
2615 | |
2616 | #ifdef REAL_DMA |
2617 | static void NCR5380_dma_complete(NCR5380_instance * instance) { |
2618 | NCR5380_local_declare(); |
2619 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
2620 | int transferred; |
2621 | NCR5380_setup(instance); |
2622 | |
2623 | /* |
2624 | * XXX this might not be right. |
2625 | * |
2626 | * Wait for final byte to transfer, ie wait for ACK to go false. |
2627 | * |
2628 | * We should use the Last Byte Sent bit, unfortunately this is |
2629 | * not available on the 5380/5381 (only the various CMOS chips) |
2630 | * |
2631 | * FIXME: timeout, and need to handle long timeout/irq case |
2632 | */ |
2633 | |
2634 | NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ); |
2635 | |
2636 | NCR5380_write(MODE_REG, MR_BASE); |
2637 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2638 | |
2639 | /* |
2640 | * The only places we should see a phase mismatch and have to send |
2641 | * data from the same set of pointers will be the data transfer |
2642 | * phases. So, residual, requested length are only important here. |
2643 | */ |
2644 | |
2645 | if (!(hostdata->connected->SCp.phase & SR_CD)) { |
2646 | transferred = instance->dmalen - NCR5380_dma_residual(); |
2647 | hostdata->connected->SCp.this_residual -= transferred; |
2648 | hostdata->connected->SCp.ptr += transferred; |
2649 | } |
2650 | } |
2651 | #endif /* def REAL_DMA */ |
2652 | |
2653 | /* |
2654 | * Function : int NCR5380_abort (Scsi_Cmnd *cmd) |
2655 | * |
2656 | * Purpose : abort a command |
2657 | * |
2658 | * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the |
2659 | * host byte of the result field to, if zero DID_ABORTED is |
2660 | * used. |
2661 | * |
2662 | * Returns : 0 - success, -1 on failure. |
2663 | * |
2664 | * XXX - there is no way to abort the command that is currently |
2665 | * connected, you have to wait for it to complete. If this is |
2666 | * a problem, we could implement longjmp() / setjmp(), setjmp() |
2667 | * called where the loop started in NCR5380_main(). |
2668 | * |
2669 | * Locks: host lock taken by caller |
2670 | */ |
2671 | |
2672 | static int NCR5380_abort(Scsi_Cmnd * cmd) { |
2673 | NCR5380_local_declare(); |
2674 | struct Scsi_Host *instance = cmd->device->host; |
2675 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
2676 | Scsi_Cmnd *tmp, **prev; |
2677 | |
2678 | printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no); |
2679 | scsi_print_command(cmd); |
2680 | |
2681 | NCR5380_print_status(instance); |
2682 | |
2683 | NCR5380_setup(instance); |
2684 | |
2685 | dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no)); |
2686 | dprintk(NDEBUG_ABORT, (" basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG))); |
2687 | |
2688 | #if 0 |
2689 | /* |
2690 | * Case 1 : If the command is the currently executing command, |
2691 | * we'll set the aborted flag and return control so that |
2692 | * information transfer routine can exit cleanly. |
2693 | */ |
2694 | |
2695 | if (hostdata->connected == cmd) { |
2696 | dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no)); |
2697 | hostdata->aborted = 1; |
2698 | /* |
2699 | * We should perform BSY checking, and make sure we haven't slipped |
2700 | * into BUS FREE. |
2701 | */ |
2702 | |
2703 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); |
2704 | /* |
2705 | * Since we can't change phases until we've completed the current |
2706 | * handshake, we have to source or sink a byte of data if the current |
2707 | * phase is not MSGOUT. |
2708 | */ |
2709 | |
2710 | /* |
2711 | * Return control to the executing NCR drive so we can clear the |
2712 | * aborted flag and get back into our main loop. |
2713 | */ |
2714 | |
2715 | return 0; |
2716 | } |
2717 | #endif |
2718 | |
2719 | /* |
2720 | * Case 2 : If the command hasn't been issued yet, we simply remove it |
2721 | * from the issue queue. |
2722 | */ |
2723 | |
2724 | dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no)); |
2725 | for (prev = (Scsi_Cmnd **) & (hostdata->issue_queue), tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble) |
2726 | if (cmd == tmp) { |
2727 | REMOVE(5, *prev, tmp, tmp->host_scribble); |
2728 | (*prev) = (Scsi_Cmnd *) tmp->host_scribble; |
2729 | tmp->host_scribble = NULL; |
2730 | tmp->result = DID_ABORT << 16; |
2731 | dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no)); |
2732 | tmp->scsi_done(tmp); |
2733 | return SUCCESS; |
2734 | } |
2735 | #if (NDEBUG & NDEBUG_ABORT) |
2736 | /* KLL */ |
2737 | else if (prev == tmp) |
2738 | printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no); |
2739 | #endif |
2740 | |
2741 | /* |
2742 | * Case 3 : If any commands are connected, we're going to fail the abort |
2743 | * and let the high level SCSI driver retry at a later time or |
2744 | * issue a reset. |
2745 | * |
2746 | * Timeouts, and therefore aborted commands, will be highly unlikely |
2747 | * and handling them cleanly in this situation would make the common |
2748 | * case of noresets less efficient, and would pollute our code. So, |
2749 | * we fail. |
2750 | */ |
2751 | |
2752 | if (hostdata->connected) { |
2753 | dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no)); |
2754 | return FAILED; |
2755 | } |
2756 | /* |
2757 | * Case 4: If the command is currently disconnected from the bus, and |
2758 | * there are no connected commands, we reconnect the I_T_L or |
2759 | * I_T_L_Q nexus associated with it, go into message out, and send |
2760 | * an abort message. |
2761 | * |
2762 | * This case is especially ugly. In order to reestablish the nexus, we |
2763 | * need to call NCR5380_select(). The easiest way to implement this |
2764 | * function was to abort if the bus was busy, and let the interrupt |
2765 | * handler triggered on the SEL for reselect take care of lost arbitrations |
2766 | * where necessary, meaning interrupts need to be enabled. |
2767 | * |
2768 | * When interrupts are enabled, the queues may change - so we |
2769 | * can't remove it from the disconnected queue before selecting it |
2770 | * because that could cause a failure in hashing the nexus if that |
2771 | * device reselected. |
2772 | * |
2773 | * Since the queues may change, we can't use the pointers from when we |
2774 | * first locate it. |
2775 | * |
2776 | * So, we must first locate the command, and if NCR5380_select() |
2777 | * succeeds, then issue the abort, relocate the command and remove |
2778 | * it from the disconnected queue. |
2779 | */ |
2780 | |
2781 | for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble) |
2782 | if (cmd == tmp) { |
2783 | dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no)); |
2784 | |
2785 | if (NCR5380_select(instance, cmd, (int) cmd->tag)) |
2786 | return FAILED; |
2787 | dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no)); |
2788 | |
2789 | do_abort(instance); |
2790 | |
2791 | for (prev = (Scsi_Cmnd **) & (hostdata->disconnected_queue), tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble) |
2792 | if (cmd == tmp) { |
2793 | REMOVE(5, *prev, tmp, tmp->host_scribble); |
2794 | *prev = (Scsi_Cmnd *) tmp->host_scribble; |
2795 | tmp->host_scribble = NULL; |
2796 | tmp->result = DID_ABORT << 16; |
2797 | tmp->scsi_done(tmp); |
2798 | return SUCCESS; |
2799 | } |
2800 | } |
2801 | /* |
2802 | * Case 5 : If we reached this point, the command was not found in any of |
2803 | * the queues. |
2804 | * |
2805 | * We probably reached this point because of an unlikely race condition |
2806 | * between the command completing successfully and the abortion code, |
2807 | * so we won't panic, but we will notify the user in case something really |
2808 | * broke. |
2809 | */ |
2810 | printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n" |
2811 | " before abortion\n", instance->host_no); |
2812 | return FAILED; |
2813 | } |
2814 | |
2815 | |
2816 | /* |
2817 | * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd) |
2818 | * |
2819 | * Purpose : reset the SCSI bus. |
2820 | * |
2821 | * Returns : SUCCESS |
2822 | * |
2823 | * Locks: host lock taken by caller |
2824 | */ |
2825 | |
2826 | static int NCR5380_bus_reset(Scsi_Cmnd * cmd) |
2827 | { |
2828 | struct Scsi_Host *instance = cmd->device->host; |
2829 | |
2830 | NCR5380_local_declare(); |
2831 | NCR5380_setup(instance); |
2832 | NCR5380_print_status(instance); |
2833 | |
2834 | spin_lock_irq(instance->host_lock); |
2835 | do_reset(instance); |
2836 | spin_unlock_irq(instance->host_lock); |
2837 | |
2838 | return SUCCESS; |
2839 | } |
2840 |
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