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1da177e4 LT |
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@redhat.com) | |
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 | ||
90 | #if (NDEBUG & NDEBUG_LISTS) | |
91 | #define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); } | |
92 | #define REMOVE(w,x,y,z) {printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, (void*)(w), (void*)(x), (void*)(y), (void*)(z)); if ((x)==(y)) udelay(5); } | |
93 | #else | |
94 | #define LIST(x,y) | |
95 | #define REMOVE(w,x,y,z) | |
96 | #endif | |
97 | ||
98 | #ifndef notyet | |
99 | #undef LINKED | |
100 | #undef REAL_DMA | |
101 | #endif | |
102 | ||
103 | #ifdef REAL_DMA_POLL | |
104 | #undef READ_OVERRUNS | |
105 | #define READ_OVERRUNS | |
106 | #endif | |
107 | ||
108 | #ifdef BOARD_REQUIRES_NO_DELAY | |
109 | #define io_recovery_delay(x) | |
110 | #else | |
111 | #define io_recovery_delay(x) udelay(x) | |
112 | #endif | |
113 | ||
114 | /* | |
115 | * Design | |
116 | * | |
117 | * This is a generic 5380 driver. To use it on a different platform, | |
118 | * one simply writes appropriate system specific macros (ie, data | |
119 | * transfer - some PC's will use the I/O bus, 68K's must use | |
120 | * memory mapped) and drops this file in their 'C' wrapper. | |
121 | * | |
122 | * (Note from hch: unfortunately it was not enough for the different | |
123 | * m68k folks and instead of improving this driver they copied it | |
124 | * and hacked it up for their needs. As a consequence they lost | |
125 | * most updates to this driver. Maybe someone will fix all these | |
126 | * drivers to use a common core one day..) | |
127 | * | |
128 | * As far as command queueing, two queues are maintained for | |
129 | * each 5380 in the system - commands that haven't been issued yet, | |
130 | * and commands that are currently executing. This means that an | |
131 | * unlimited number of commands may be queued, letting | |
132 | * more commands propagate from the higher driver levels giving higher | |
133 | * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, | |
134 | * allowing multiple commands to propagate all the way to a SCSI-II device | |
135 | * while a command is already executing. | |
136 | * | |
137 | * | |
138 | * Issues specific to the NCR5380 : | |
139 | * | |
140 | * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead | |
141 | * piece of hardware that requires you to sit in a loop polling for | |
142 | * the REQ signal as long as you are connected. Some devices are | |
143 | * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect | |
144 | * while doing long seek operations. | |
145 | * | |
146 | * The workaround for this is to keep track of devices that have | |
147 | * disconnected. If the device hasn't disconnected, for commands that | |
148 | * should disconnect, we do something like | |
149 | * | |
150 | * while (!REQ is asserted) { sleep for N usecs; poll for M usecs } | |
151 | * | |
152 | * Some tweaking of N and M needs to be done. An algorithm based | |
153 | * on "time to data" would give the best results as long as short time | |
154 | * to datas (ie, on the same track) were considered, however these | |
155 | * broken devices are the exception rather than the rule and I'd rather | |
156 | * spend my time optimizing for the normal case. | |
157 | * | |
158 | * Architecture : | |
159 | * | |
160 | * At the heart of the design is a coroutine, NCR5380_main, | |
161 | * which is started from a workqueue for each NCR5380 host in the | |
162 | * system. It attempts to establish I_T_L or I_T_L_Q nexuses by | |
163 | * removing the commands from the issue queue and calling | |
164 | * NCR5380_select() if a nexus is not established. | |
165 | * | |
166 | * Once a nexus is established, the NCR5380_information_transfer() | |
167 | * phase goes through the various phases as instructed by the target. | |
168 | * if the target goes into MSG IN and sends a DISCONNECT message, | |
169 | * the command structure is placed into the per instance disconnected | |
170 | * queue, and NCR5380_main tries to find more work. If the target is | |
171 | * idle for too long, the system will try to sleep. | |
172 | * | |
173 | * If a command has disconnected, eventually an interrupt will trigger, | |
174 | * calling NCR5380_intr() which will in turn call NCR5380_reselect | |
175 | * to reestablish a nexus. This will run main if necessary. | |
176 | * | |
177 | * On command termination, the done function will be called as | |
178 | * appropriate. | |
179 | * | |
180 | * SCSI pointers are maintained in the SCp field of SCSI command | |
181 | * structures, being initialized after the command is connected | |
182 | * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. | |
183 | * Note that in violation of the standard, an implicit SAVE POINTERS operation | |
184 | * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. | |
185 | */ | |
186 | ||
187 | /* | |
188 | * Using this file : | |
189 | * This file a skeleton Linux SCSI driver for the NCR 5380 series | |
190 | * of chips. To use it, you write an architecture specific functions | |
191 | * and macros and include this file in your driver. | |
192 | * | |
193 | * These macros control options : | |
194 | * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be | |
195 | * defined. | |
196 | * | |
197 | * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically | |
198 | * for commands that return with a CHECK CONDITION status. | |
199 | * | |
200 | * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential | |
201 | * transceivers. | |
202 | * | |
203 | * DONT_USE_INTR - if defined, never use interrupts, even if we probe or | |
204 | * override-configure an IRQ. | |
205 | * | |
206 | * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512 | |
207 | * bytes at a time. Since interrupts are disabled by default during | |
208 | * these transfers, we might need this to give reasonable interrupt | |
209 | * service time if the transfer size gets too large. | |
210 | * | |
211 | * LINKED - if defined, linked commands are supported. | |
212 | * | |
213 | * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases. | |
214 | * | |
215 | * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. | |
216 | * | |
217 | * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't | |
218 | * rely on phase mismatch and EOP interrupts to determine end | |
219 | * of phase. | |
220 | * | |
221 | * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You | |
222 | * only really want to use this if you're having a problem with | |
223 | * dropped characters during high speed communications, and even | |
224 | * then, you're going to be better off twiddling with transfersize | |
225 | * in the high level code. | |
226 | * | |
227 | * Defaults for these will be provided although the user may want to adjust | |
228 | * these to allocate CPU resources to the SCSI driver or "real" code. | |
229 | * | |
230 | * USLEEP_SLEEP - amount of time, in jiffies, to sleep | |
231 | * | |
232 | * USLEEP_POLL - amount of time, in jiffies, to poll | |
233 | * | |
234 | * These macros MUST be defined : | |
235 | * NCR5380_local_declare() - declare any local variables needed for your | |
236 | * transfer routines. | |
237 | * | |
238 | * NCR5380_setup(instance) - initialize any local variables needed from a given | |
239 | * instance of the host adapter for NCR5380_{read,write,pread,pwrite} | |
240 | * | |
241 | * NCR5380_read(register) - read from the specified register | |
242 | * | |
243 | * NCR5380_write(register, value) - write to the specific register | |
244 | * | |
245 | * NCR5380_implementation_fields - additional fields needed for this | |
246 | * specific implementation of the NCR5380 | |
247 | * | |
248 | * Either real DMA *or* pseudo DMA may be implemented | |
249 | * REAL functions : | |
250 | * NCR5380_REAL_DMA should be defined if real DMA is to be used. | |
251 | * Note that the DMA setup functions should return the number of bytes | |
252 | * that they were able to program the controller for. | |
253 | * | |
254 | * Also note that generic i386/PC versions of these macros are | |
255 | * available as NCR5380_i386_dma_write_setup, | |
256 | * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. | |
257 | * | |
258 | * NCR5380_dma_write_setup(instance, src, count) - initialize | |
259 | * NCR5380_dma_read_setup(instance, dst, count) - initialize | |
260 | * NCR5380_dma_residual(instance); - residual count | |
261 | * | |
262 | * PSEUDO functions : | |
263 | * NCR5380_pwrite(instance, src, count) | |
264 | * NCR5380_pread(instance, dst, count); | |
265 | * | |
266 | * The generic driver is initialized by calling NCR5380_init(instance), | |
267 | * after setting the appropriate host specific fields and ID. If the | |
268 | * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, | |
269 | * possible) function may be used. | |
270 | */ | |
271 | ||
272 | static int do_abort(struct Scsi_Host *host); | |
273 | static void do_reset(struct Scsi_Host *host); | |
274 | ||
275 | /* | |
276 | * initialize_SCp - init the scsi pointer field | |
277 | * @cmd: command block to set up | |
278 | * | |
279 | * Set up the internal fields in the SCSI command. | |
280 | */ | |
281 | ||
282 | static __inline__ void initialize_SCp(Scsi_Cmnd * cmd) | |
283 | { | |
284 | /* | |
285 | * Initialize the Scsi Pointer field so that all of the commands in the | |
286 | * various queues are valid. | |
287 | */ | |
288 | ||
289 | if (cmd->use_sg) { | |
290 | cmd->SCp.buffer = (struct scatterlist *) cmd->buffer; | |
291 | cmd->SCp.buffers_residual = cmd->use_sg - 1; | |
292 | cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+ | |
293 | cmd->SCp.buffer->offset; | |
294 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
295 | } else { | |
296 | cmd->SCp.buffer = NULL; | |
297 | cmd->SCp.buffers_residual = 0; | |
298 | cmd->SCp.ptr = (char *) cmd->request_buffer; | |
299 | cmd->SCp.this_residual = cmd->request_bufflen; | |
300 | } | |
301 | } | |
302 | ||
303 | /** | |
304 | * NCR5380_poll_politely - wait for NCR5380 status bits | |
305 | * @instance: controller to poll | |
306 | * @reg: 5380 register to poll | |
307 | * @bit: Bitmask to check | |
308 | * @val: Value required to exit | |
309 | * | |
310 | * Polls the NCR5380 in a reasonably efficient manner waiting for | |
311 | * an event to occur, after a short quick poll we begin giving the | |
312 | * CPU back in non IRQ contexts | |
313 | * | |
314 | * Returns the value of the register or a negative error code. | |
315 | */ | |
316 | ||
317 | static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t) | |
318 | { | |
319 | NCR5380_local_declare(); | |
320 | int n = 500; /* At about 8uS a cycle for the cpu access */ | |
321 | unsigned long end = jiffies + t; | |
322 | int r; | |
323 | ||
324 | NCR5380_setup(instance); | |
325 | ||
326 | while( n-- > 0) | |
327 | { | |
328 | r = NCR5380_read(reg); | |
329 | if((r & bit) == val) | |
330 | return 0; | |
331 | cpu_relax(); | |
332 | } | |
333 | ||
334 | /* t time yet ? */ | |
335 | while(time_before(jiffies, end)) | |
336 | { | |
337 | r = NCR5380_read(reg); | |
338 | if((r & bit) == val) | |
339 | return 0; | |
340 | if(!in_interrupt()) | |
341 | yield(); | |
342 | else | |
343 | cpu_relax(); | |
344 | } | |
345 | return -ETIMEDOUT; | |
346 | } | |
347 | ||
348 | static struct { | |
349 | unsigned char value; | |
350 | const char *name; | |
351 | } phases[] = { | |
352 | {PHASE_DATAOUT, "DATAOUT"}, | |
353 | {PHASE_DATAIN, "DATAIN"}, | |
354 | {PHASE_CMDOUT, "CMDOUT"}, | |
355 | {PHASE_STATIN, "STATIN"}, | |
356 | {PHASE_MSGOUT, "MSGOUT"}, | |
357 | {PHASE_MSGIN, "MSGIN"}, | |
358 | {PHASE_UNKNOWN, "UNKNOWN"} | |
359 | }; | |
360 | ||
361 | #ifdef NDEBUG | |
362 | static struct { | |
363 | unsigned char mask; | |
364 | const char *name; | |
365 | } signals[] = { | |
366 | {SR_DBP, "PARITY"}, | |
367 | {SR_RST, "RST"}, | |
368 | {SR_BSY, "BSY"}, | |
369 | {SR_REQ, "REQ"}, | |
370 | {SR_MSG, "MSG"}, | |
371 | {SR_CD, "CD"}, | |
372 | {SR_IO, "IO"}, | |
373 | {SR_SEL, "SEL"}, | |
374 | {0, NULL} | |
375 | }, | |
376 | basrs[] = { | |
377 | {BASR_ATN, "ATN"}, | |
378 | {BASR_ACK, "ACK"}, | |
379 | {0, NULL} | |
380 | }, | |
381 | icrs[] = { | |
382 | {ICR_ASSERT_RST, "ASSERT RST"}, | |
383 | {ICR_ASSERT_ACK, "ASSERT ACK"}, | |
384 | {ICR_ASSERT_BSY, "ASSERT BSY"}, | |
385 | {ICR_ASSERT_SEL, "ASSERT SEL"}, | |
386 | {ICR_ASSERT_ATN, "ASSERT ATN"}, | |
387 | {ICR_ASSERT_DATA, "ASSERT DATA"}, | |
388 | {0, NULL} | |
389 | }, | |
390 | mrs[] = { | |
391 | {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, | |
392 | {MR_TARGET, "MODE TARGET"}, | |
393 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, | |
394 | {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"}, | |
395 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, | |
396 | {MR_DMA_MODE, "MODE DMA"}, | |
397 | {MR_ARBITRATE, "MODE ARBITRATION"}, | |
398 | {0, NULL} | |
399 | }; | |
400 | ||
401 | /** | |
402 | * NCR5380_print - print scsi bus signals | |
403 | * @instance: adapter state to dump | |
404 | * | |
405 | * Print the SCSI bus signals for debugging purposes | |
406 | * | |
407 | * Locks: caller holds hostdata lock (not essential) | |
408 | */ | |
409 | ||
410 | static void NCR5380_print(struct Scsi_Host *instance) | |
411 | { | |
412 | NCR5380_local_declare(); | |
413 | unsigned char status, data, basr, mr, icr, i; | |
414 | NCR5380_setup(instance); | |
415 | ||
416 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
417 | status = NCR5380_read(STATUS_REG); | |
418 | mr = NCR5380_read(MODE_REG); | |
419 | icr = NCR5380_read(INITIATOR_COMMAND_REG); | |
420 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
421 | ||
422 | printk("STATUS_REG: %02x ", status); | |
423 | for (i = 0; signals[i].mask; ++i) | |
424 | if (status & signals[i].mask) | |
425 | printk(",%s", signals[i].name); | |
426 | printk("\nBASR: %02x ", basr); | |
427 | for (i = 0; basrs[i].mask; ++i) | |
428 | if (basr & basrs[i].mask) | |
429 | printk(",%s", basrs[i].name); | |
430 | printk("\nICR: %02x ", icr); | |
431 | for (i = 0; icrs[i].mask; ++i) | |
432 | if (icr & icrs[i].mask) | |
433 | printk(",%s", icrs[i].name); | |
434 | printk("\nMODE: %02x ", mr); | |
435 | for (i = 0; mrs[i].mask; ++i) | |
436 | if (mr & mrs[i].mask) | |
437 | printk(",%s", mrs[i].name); | |
438 | printk("\n"); | |
439 | } | |
440 | ||
441 | ||
442 | /* | |
443 | * NCR5380_print_phase - show SCSI phase | |
444 | * @instance: adapter to dump | |
445 | * | |
446 | * Print the current SCSI phase for debugging purposes | |
447 | * | |
448 | * Locks: none | |
449 | */ | |
450 | ||
451 | static void NCR5380_print_phase(struct Scsi_Host *instance) | |
452 | { | |
453 | NCR5380_local_declare(); | |
454 | unsigned char status; | |
455 | int i; | |
456 | NCR5380_setup(instance); | |
457 | ||
458 | status = NCR5380_read(STATUS_REG); | |
459 | if (!(status & SR_REQ)) | |
460 | printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no); | |
461 | else { | |
462 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i); | |
463 | printk("scsi%d : phase %s\n", instance->host_no, phases[i].name); | |
464 | } | |
465 | } | |
466 | #endif | |
467 | ||
468 | /* | |
469 | * These need tweaking, and would probably work best as per-device | |
470 | * flags initialized differently for disk, tape, cd, etc devices. | |
471 | * People with broken devices are free to experiment as to what gives | |
472 | * the best results for them. | |
473 | * | |
474 | * USLEEP_SLEEP should be a minimum seek time. | |
475 | * | |
476 | * USLEEP_POLL should be a maximum rotational latency. | |
477 | */ | |
478 | #ifndef USLEEP_SLEEP | |
479 | /* 20 ms (reasonable hard disk speed) */ | |
480 | #define USLEEP_SLEEP (20*HZ/1000) | |
481 | #endif | |
482 | /* 300 RPM (floppy speed) */ | |
483 | #ifndef USLEEP_POLL | |
484 | #define USLEEP_POLL (200*HZ/1000) | |
485 | #endif | |
486 | #ifndef USLEEP_WAITLONG | |
487 | /* RvC: (reasonable time to wait on select error) */ | |
488 | #define USLEEP_WAITLONG USLEEP_SLEEP | |
489 | #endif | |
490 | ||
491 | /* | |
492 | * Function : int should_disconnect (unsigned char cmd) | |
493 | * | |
494 | * Purpose : decide weather a command would normally disconnect or | |
495 | * not, since if it won't disconnect we should go to sleep. | |
496 | * | |
497 | * Input : cmd - opcode of SCSI command | |
498 | * | |
499 | * Returns : DISCONNECT_LONG if we should disconnect for a really long | |
500 | * time (ie always, sleep, look for REQ active, sleep), | |
501 | * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal | |
502 | * time-to-data delay, DISCONNECT_NONE if this command would return | |
503 | * immediately. | |
504 | * | |
505 | * Future sleep algorithms based on time to data can exploit | |
506 | * something like this so they can differentiate between "normal" | |
507 | * (ie, read, write, seek) and unusual commands (ie, * format). | |
508 | * | |
509 | * Note : We don't deal with commands that handle an immediate disconnect, | |
510 | * | |
511 | */ | |
512 | ||
513 | static int should_disconnect(unsigned char cmd) | |
514 | { | |
515 | switch (cmd) { | |
516 | case READ_6: | |
517 | case WRITE_6: | |
518 | case SEEK_6: | |
519 | case READ_10: | |
520 | case WRITE_10: | |
521 | case SEEK_10: | |
522 | return DISCONNECT_TIME_TO_DATA; | |
523 | case FORMAT_UNIT: | |
524 | case SEARCH_HIGH: | |
525 | case SEARCH_LOW: | |
526 | case SEARCH_EQUAL: | |
527 | return DISCONNECT_LONG; | |
528 | default: | |
529 | return DISCONNECT_NONE; | |
530 | } | |
531 | } | |
532 | ||
533 | static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout) | |
534 | { | |
535 | hostdata->time_expires = jiffies + timeout; | |
536 | schedule_delayed_work(&hostdata->coroutine, timeout); | |
537 | } | |
538 | ||
539 | ||
540 | static int probe_irq __initdata = 0; | |
541 | ||
542 | /** | |
543 | * probe_intr - helper for IRQ autoprobe | |
544 | * @irq: interrupt number | |
545 | * @dev_id: unused | |
546 | * @regs: unused | |
547 | * | |
548 | * Set a flag to indicate the IRQ in question was received. This is | |
549 | * used by the IRQ probe code. | |
550 | */ | |
551 | ||
552 | static irqreturn_t __init probe_intr(int irq, void *dev_id, | |
553 | struct pt_regs *regs) | |
554 | { | |
555 | probe_irq = irq; | |
556 | return IRQ_HANDLED; | |
557 | } | |
558 | ||
559 | /** | |
560 | * NCR5380_probe_irq - find the IRQ of an NCR5380 | |
561 | * @instance: NCR5380 controller | |
562 | * @possible: bitmask of ISA IRQ lines | |
563 | * | |
564 | * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ | |
565 | * and then looking to see what interrupt actually turned up. | |
566 | * | |
567 | * Locks: none, irqs must be enabled on entry | |
568 | */ | |
569 | ||
570 | static int __init NCR5380_probe_irq(struct Scsi_Host *instance, int possible) | |
571 | { | |
572 | NCR5380_local_declare(); | |
573 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
574 | unsigned long timeout; | |
575 | int trying_irqs, i, mask; | |
576 | NCR5380_setup(instance); | |
577 | ||
578 | for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1) | |
579 | if ((mask & possible) && (request_irq(i, &probe_intr, SA_INTERRUPT, "NCR-probe", NULL) == 0)) | |
580 | trying_irqs |= mask; | |
581 | ||
582 | timeout = jiffies + (250 * HZ / 1000); | |
583 | probe_irq = SCSI_IRQ_NONE; | |
584 | ||
585 | /* | |
586 | * A interrupt is triggered whenever BSY = false, SEL = true | |
587 | * and a bit set in the SELECT_ENABLE_REG is asserted on the | |
588 | * SCSI bus. | |
589 | * | |
590 | * Note that the bus is only driven when the phase control signals | |
591 | * (I/O, C/D, and MSG) match those in the TCR, so we must reset that | |
592 | * to zero. | |
593 | */ | |
594 | ||
595 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
596 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
597 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); | |
598 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL); | |
599 | ||
600 | while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout)) | |
601 | { | |
602 | set_current_state(TASK_UNINTERRUPTIBLE); | |
603 | schedule_timeout(1); | |
604 | } | |
605 | ||
606 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
607 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
608 | ||
609 | for (i = 0, mask = 1; i < 16; ++i, mask <<= 1) | |
610 | if (trying_irqs & mask) | |
611 | free_irq(i, NULL); | |
612 | ||
613 | return probe_irq; | |
614 | } | |
615 | ||
616 | /** | |
617 | * NCR58380_print_options - show options | |
618 | * @instance: unused for now | |
619 | * | |
620 | * Called by probe code indicating the NCR5380 driver options that | |
621 | * were selected. At some point this will switch to runtime options | |
622 | * read from the adapter in question | |
623 | * | |
624 | * Locks: none | |
625 | */ | |
626 | ||
627 | static void __init NCR5380_print_options(struct Scsi_Host *instance) | |
628 | { | |
629 | printk(" generic options" | |
630 | #ifdef AUTOPROBE_IRQ | |
631 | " AUTOPROBE_IRQ" | |
632 | #endif | |
633 | #ifdef AUTOSENSE | |
634 | " AUTOSENSE" | |
635 | #endif | |
636 | #ifdef DIFFERENTIAL | |
637 | " DIFFERENTIAL" | |
638 | #endif | |
639 | #ifdef REAL_DMA | |
640 | " REAL DMA" | |
641 | #endif | |
642 | #ifdef REAL_DMA_POLL | |
643 | " REAL DMA POLL" | |
644 | #endif | |
645 | #ifdef PARITY | |
646 | " PARITY" | |
647 | #endif | |
648 | #ifdef PSEUDO_DMA | |
649 | " PSEUDO DMA" | |
650 | #endif | |
651 | #ifdef UNSAFE | |
652 | " UNSAFE " | |
653 | #endif | |
654 | ); | |
655 | printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP); | |
656 | printk(" generic release=%d", NCR5380_PUBLIC_RELEASE); | |
657 | if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) { | |
658 | printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE); | |
659 | } | |
660 | } | |
661 | ||
662 | /** | |
663 | * NCR5380_print_status - dump controller info | |
664 | * @instance: controller to dump | |
665 | * | |
666 | * Print commands in the various queues, called from NCR5380_abort | |
667 | * and NCR5380_debug to aid debugging. | |
668 | * | |
669 | * Locks: called functions disable irqs | |
670 | */ | |
671 | ||
672 | static void NCR5380_print_status(struct Scsi_Host *instance) | |
673 | { | |
674 | NCR5380_dprint(NDEBUG_ANY, instance); | |
675 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
676 | } | |
677 | ||
678 | /******************************************/ | |
679 | /* | |
680 | * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED] | |
681 | * | |
682 | * *buffer: I/O buffer | |
683 | * **start: if inout == FALSE pointer into buffer where user read should start | |
684 | * offset: current offset | |
685 | * length: length of buffer | |
686 | * hostno: Scsi_Host host_no | |
687 | * inout: TRUE - user is writing; FALSE - user is reading | |
688 | * | |
689 | * Return the number of bytes read from or written | |
690 | */ | |
691 | ||
692 | #undef SPRINTF | |
693 | #define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0) | |
694 | static | |
695 | char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length); | |
696 | static | |
697 | char *lprint_command(unsigned char *cmd, char *pos, char *buffer, int len); | |
698 | static | |
699 | char *lprint_opcode(int opcode, char *pos, char *buffer, int length); | |
700 | ||
701 | static | |
702 | int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer, char **start, off_t offset, int length, int inout) | |
703 | { | |
704 | char *pos = buffer; | |
705 | struct NCR5380_hostdata *hostdata; | |
706 | Scsi_Cmnd *ptr; | |
707 | ||
708 | hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
709 | ||
710 | if (inout) { /* Has data been written to the file ? */ | |
711 | #ifdef DTC_PUBLIC_RELEASE | |
712 | dtc_wmaxi = dtc_maxi = 0; | |
713 | #endif | |
714 | #ifdef PAS16_PUBLIC_RELEASE | |
715 | pas_wmaxi = pas_maxi = 0; | |
716 | #endif | |
717 | return (-ENOSYS); /* Currently this is a no-op */ | |
718 | } | |
719 | SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE); | |
720 | if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) | |
721 | SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE); | |
722 | #ifdef DTC_PUBLIC_RELEASE | |
723 | SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE); | |
724 | #endif | |
725 | #ifdef T128_PUBLIC_RELEASE | |
726 | SPRINTF("T128 release %d", T128_PUBLIC_RELEASE); | |
727 | #endif | |
728 | #ifdef GENERIC_NCR5380_PUBLIC_RELEASE | |
729 | SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE); | |
730 | #endif | |
731 | #ifdef PAS16_PUBLIC_RELEASE | |
732 | SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE); | |
733 | #endif | |
734 | ||
735 | SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base); | |
736 | SPRINTF("io_port: %04x ", (int) instance->io_port); | |
737 | if (instance->irq == SCSI_IRQ_NONE) | |
738 | SPRINTF("IRQ: None.\n"); | |
739 | else | |
740 | SPRINTF("IRQ: %d.\n", instance->irq); | |
741 | ||
742 | #ifdef DTC_PUBLIC_RELEASE | |
743 | SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi); | |
744 | #endif | |
745 | #ifdef PAS16_PUBLIC_RELEASE | |
746 | SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi); | |
747 | #endif | |
748 | spin_lock_irq(instance->host_lock); | |
749 | if (!hostdata->connected) | |
750 | SPRINTF("scsi%d: no currently connected command\n", instance->host_no); | |
751 | else | |
752 | pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, pos, buffer, length); | |
753 | SPRINTF("scsi%d: issue_queue\n", instance->host_no); | |
754 | for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) | |
755 | pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); | |
756 | ||
757 | SPRINTF("scsi%d: disconnected_queue\n", instance->host_no); | |
758 | for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) | |
759 | pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); | |
760 | spin_unlock_irq(instance->host_lock); | |
761 | ||
762 | *start = buffer; | |
763 | if (pos - buffer < offset) | |
764 | return 0; | |
765 | else if (pos - buffer - offset < length) | |
766 | return pos - buffer - offset; | |
767 | return length; | |
768 | } | |
769 | ||
770 | static char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length) | |
771 | { | |
772 | SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun); | |
773 | SPRINTF(" command = "); | |
774 | pos = lprint_command(cmd->cmnd, pos, buffer, length); | |
775 | return (pos); | |
776 | } | |
777 | ||
778 | static char *lprint_command(unsigned char *command, char *pos, char *buffer, int length) | |
779 | { | |
780 | int i, s; | |
781 | pos = lprint_opcode(command[0], pos, buffer, length); | |
782 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) | |
783 | SPRINTF("%02x ", command[i]); | |
784 | SPRINTF("\n"); | |
785 | return (pos); | |
786 | } | |
787 | ||
788 | static char *lprint_opcode(int opcode, char *pos, char *buffer, int length) | |
789 | { | |
790 | SPRINTF("%2d (0x%02x)", opcode, opcode); | |
791 | return (pos); | |
792 | } | |
793 | ||
794 | ||
795 | /** | |
796 | * NCR5380_init - initialise an NCR5380 | |
797 | * @instance: adapter to configure | |
798 | * @flags: control flags | |
799 | * | |
800 | * Initializes *instance and corresponding 5380 chip, | |
801 | * with flags OR'd into the initial flags value. | |
802 | * | |
803 | * Notes : I assume that the host, hostno, and id bits have been | |
804 | * set correctly. I don't care about the irq and other fields. | |
805 | * | |
806 | * Returns 0 for success | |
807 | * | |
808 | * Locks: interrupts must be enabled when we are called | |
809 | */ | |
810 | ||
811 | static int __devinit NCR5380_init(struct Scsi_Host *instance, int flags) | |
812 | { | |
813 | NCR5380_local_declare(); | |
814 | int i, pass; | |
815 | unsigned long timeout; | |
816 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
817 | ||
818 | if(in_interrupt()) | |
819 | printk(KERN_ERR "NCR5380_init called with interrupts off!\n"); | |
820 | /* | |
821 | * On NCR53C400 boards, NCR5380 registers are mapped 8 past | |
822 | * the base address. | |
823 | */ | |
824 | ||
825 | #ifdef NCR53C400 | |
826 | if (flags & FLAG_NCR53C400) | |
827 | instance->NCR5380_instance_name += NCR53C400_address_adjust; | |
828 | #endif | |
829 | ||
830 | NCR5380_setup(instance); | |
831 | ||
832 | hostdata->aborted = 0; | |
833 | hostdata->id_mask = 1 << instance->this_id; | |
834 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) | |
835 | if (i > hostdata->id_mask) | |
836 | hostdata->id_higher_mask |= i; | |
837 | for (i = 0; i < 8; ++i) | |
838 | hostdata->busy[i] = 0; | |
839 | #ifdef REAL_DMA | |
840 | hostdata->dmalen = 0; | |
841 | #endif | |
842 | hostdata->targets_present = 0; | |
843 | hostdata->connected = NULL; | |
844 | hostdata->issue_queue = NULL; | |
845 | hostdata->disconnected_queue = NULL; | |
846 | ||
847 | INIT_WORK(&hostdata->coroutine, NCR5380_main, hostdata); | |
848 | ||
849 | #ifdef NCR5380_STATS | |
850 | for (i = 0; i < 8; ++i) { | |
851 | hostdata->time_read[i] = 0; | |
852 | hostdata->time_write[i] = 0; | |
853 | hostdata->bytes_read[i] = 0; | |
854 | hostdata->bytes_write[i] = 0; | |
855 | } | |
856 | hostdata->timebase = 0; | |
857 | hostdata->pendingw = 0; | |
858 | hostdata->pendingr = 0; | |
859 | #endif | |
860 | ||
861 | /* The CHECK code seems to break the 53C400. Will check it later maybe */ | |
862 | if (flags & FLAG_NCR53C400) | |
863 | hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags; | |
864 | else | |
865 | hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags; | |
866 | ||
867 | hostdata->host = instance; | |
868 | hostdata->time_expires = 0; | |
869 | ||
870 | #ifndef AUTOSENSE | |
871 | if ((instance->cmd_per_lun > 1) || instance->can_queue > 1) | |
872 | printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n" | |
873 | " be incorrectly cleared.\n", instance->host_no); | |
874 | #endif /* def AUTOSENSE */ | |
875 | ||
876 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
877 | NCR5380_write(MODE_REG, MR_BASE); | |
878 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
879 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
880 | ||
881 | #ifdef NCR53C400 | |
882 | if (hostdata->flags & FLAG_NCR53C400) { | |
883 | NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE); | |
884 | } | |
885 | #endif | |
886 | ||
887 | /* | |
888 | * Detect and correct bus wedge problems. | |
889 | * | |
890 | * If the system crashed, it may have crashed in a state | |
891 | * where a SCSI command was still executing, and the | |
892 | * SCSI bus is not in a BUS FREE STATE. | |
893 | * | |
894 | * If this is the case, we'll try to abort the currently | |
895 | * established nexus which we know nothing about, and that | |
896 | * failing, do a hard reset of the SCSI bus | |
897 | */ | |
898 | ||
899 | for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { | |
900 | switch (pass) { | |
901 | case 1: | |
902 | case 3: | |
903 | case 5: | |
904 | printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no); | |
905 | timeout = jiffies + 5 * HZ; | |
906 | NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ); | |
907 | break; | |
908 | case 2: | |
909 | printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no); | |
910 | do_abort(instance); | |
911 | break; | |
912 | case 4: | |
913 | printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no); | |
914 | do_reset(instance); | |
915 | break; | |
916 | case 6: | |
917 | printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no); | |
918 | return -ENXIO; | |
919 | } | |
920 | } | |
921 | return 0; | |
922 | } | |
923 | ||
924 | /** | |
925 | * NCR5380_exit - remove an NCR5380 | |
926 | * @instance: adapter to remove | |
927 | */ | |
928 | ||
929 | static void __devexit NCR5380_exit(struct Scsi_Host *instance) | |
930 | { | |
931 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
932 | ||
933 | cancel_delayed_work(&hostdata->coroutine); | |
934 | flush_scheduled_work(); | |
935 | } | |
936 | ||
937 | /** | |
938 | * NCR5380_queue_command - queue a command | |
939 | * @cmd: SCSI command | |
940 | * @done: completion handler | |
941 | * | |
942 | * cmd is added to the per instance issue_queue, with minor | |
943 | * twiddling done to the host specific fields of cmd. If the | |
944 | * main coroutine is not running, it is restarted. | |
945 | * | |
946 | * Locks: host lock taken by caller | |
947 | */ | |
948 | ||
949 | static int NCR5380_queue_command(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *)) | |
950 | { | |
951 | struct Scsi_Host *instance = cmd->device->host; | |
952 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
953 | Scsi_Cmnd *tmp; | |
954 | ||
955 | #if (NDEBUG & NDEBUG_NO_WRITE) | |
956 | switch (cmd->cmnd[0]) { | |
957 | case WRITE_6: | |
958 | case WRITE_10: | |
959 | printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no); | |
960 | cmd->result = (DID_ERROR << 16); | |
961 | done(cmd); | |
962 | return 0; | |
963 | } | |
964 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ | |
965 | ||
966 | #ifdef NCR5380_STATS | |
967 | switch (cmd->cmnd[0]) { | |
968 | case WRITE: | |
969 | case WRITE_6: | |
970 | case WRITE_10: | |
971 | hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase); | |
972 | hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen; | |
973 | hostdata->pendingw++; | |
974 | break; | |
975 | case READ: | |
976 | case READ_6: | |
977 | case READ_10: | |
978 | hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase); | |
979 | hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen; | |
980 | hostdata->pendingr++; | |
981 | break; | |
982 | } | |
983 | #endif | |
984 | ||
985 | /* | |
986 | * We use the host_scribble field as a pointer to the next command | |
987 | * in a queue | |
988 | */ | |
989 | ||
990 | cmd->host_scribble = NULL; | |
991 | cmd->scsi_done = done; | |
992 | cmd->result = 0; | |
993 | ||
994 | /* | |
995 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
996 | * commands are added to the head of the queue since any command will | |
997 | * clear the contingent allegiance condition that exists and the | |
998 | * sense data is only guaranteed to be valid while the condition exists. | |
999 | */ | |
1000 | ||
1001 | if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { | |
1002 | LIST(cmd, hostdata->issue_queue); | |
1003 | cmd->host_scribble = (unsigned char *) hostdata->issue_queue; | |
1004 | hostdata->issue_queue = cmd; | |
1005 | } else { | |
1006 | for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble); | |
1007 | LIST(cmd, tmp); | |
1008 | tmp->host_scribble = (unsigned char *) cmd; | |
1009 | } | |
1010 | dprintk(NDEBUG_QUEUES, ("scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail")); | |
1011 | ||
1012 | /* Run the coroutine if it isn't already running. */ | |
1013 | /* Kick off command processing */ | |
1014 | schedule_work(&hostdata->coroutine); | |
1015 | return 0; | |
1016 | } | |
1017 | ||
1018 | ||
1019 | /** | |
1020 | * NCR5380_main - NCR state machines | |
1021 | * | |
1022 | * NCR5380_main is a coroutine that runs as long as more work can | |
1023 | * be done on the NCR5380 host adapters in a system. Both | |
1024 | * NCR5380_queue_command() and NCR5380_intr() will try to start it | |
1025 | * in case it is not running. | |
1026 | * | |
1027 | * Locks: called as its own thread with no locks held. Takes the | |
1028 | * host lock and called routines may take the isa dma lock. | |
1029 | */ | |
1030 | ||
1031 | static void NCR5380_main(void *p) | |
1032 | { | |
1033 | struct NCR5380_hostdata *hostdata = p; | |
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 | * @regs: registers (unused) | |
1146 | * | |
1147 | * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses | |
1148 | * from the disconnected queue, and restarting NCR5380_main() | |
1149 | * as required. | |
1150 | * | |
1151 | * Locks: takes the needed instance locks | |
1152 | */ | |
1153 | ||
1154 | static irqreturn_t NCR5380_intr(int irq, void *dev_id, struct pt_regs *regs) | |
1155 | { | |
1156 | NCR5380_local_declare(); | |
1157 | struct Scsi_Host *instance = (struct Scsi_Host *)dev_id; | |
1158 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
1159 | int done; | |
1160 | unsigned char basr; | |
1161 | unsigned long flags; | |
1162 | ||
1163 | dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n", 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 transfered; | |
1195 | ||
1196 | if (!hostdata->connected) | |
1197 | panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno); | |
1198 | ||
1199 | transfered = (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_work(&hostdata->coroutine); | |
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[cmd->device->id] += (jiffies - hostdata->timebase); | |
1243 | hostdata->pendingw--; | |
1244 | break; | |
1245 | case READ: | |
1246 | case READ_6: | |
1247 | case READ_10: | |
1248 | hostdata->time_read[cmd->device->id] += (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 << cmd->device->id))); | |
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, cmd->device->id)); | |
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 << cmd->device->id)) { | |
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 << cmd->device->id); | |
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 | if (cmd->SCp.ptr != (char *)cmd->sense_buffer) { | |
1539 | initialize_SCp(cmd); | |
1540 | } | |
1541 | ||
1542 | return 0; | |
1543 | ||
1544 | /* Selection failed */ | |
1545 | failed: | |
1546 | return -1; | |
1547 | ||
1548 | } | |
1549 | ||
1550 | /* | |
1551 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, | |
1552 | * unsigned char *phase, int *count, unsigned char **data) | |
1553 | * | |
1554 | * Purpose : transfers data in given phase using polled I/O | |
1555 | * | |
1556 | * Inputs : instance - instance of driver, *phase - pointer to | |
1557 | * what phase is expected, *count - pointer to number of | |
1558 | * bytes to transfer, **data - pointer to data pointer. | |
1559 | * | |
1560 | * Returns : -1 when different phase is entered without transferring | |
1561 | * maximum number of bytes, 0 if all bytes or transfered or exit | |
1562 | * is in same phase. | |
1563 | * | |
1564 | * Also, *phase, *count, *data are modified in place. | |
1565 | * | |
1566 | * XXX Note : handling for bus free may be useful. | |
1567 | */ | |
1568 | ||
1569 | /* | |
1570 | * Note : this code is not as quick as it could be, however it | |
1571 | * IS 100% reliable, and for the actual data transfer where speed | |
1572 | * counts, we will always do a pseudo DMA or DMA transfer. | |
1573 | */ | |
1574 | ||
1575 | static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { | |
1576 | NCR5380_local_declare(); | |
1577 | unsigned char p = *phase, tmp; | |
1578 | int c = *count; | |
1579 | unsigned char *d = *data; | |
1580 | /* | |
1581 | * RvC: some administrative data to process polling time | |
1582 | */ | |
1583 | int break_allowed = 0; | |
1584 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
1585 | NCR5380_setup(instance); | |
1586 | ||
1587 | if (!(p & SR_IO)) | |
1588 | dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c)); | |
1589 | else | |
1590 | dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c)); | |
1591 | ||
1592 | /* | |
1593 | * The NCR5380 chip will only drive the SCSI bus when the | |
1594 | * phase specified in the appropriate bits of the TARGET COMMAND | |
1595 | * REGISTER match the STATUS REGISTER | |
1596 | */ | |
1597 | ||
1598 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); | |
1599 | ||
1600 | /* RvC: don't know if this is necessary, but other SCSI I/O is short | |
1601 | * so breaks are not necessary there | |
1602 | */ | |
1603 | if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) { | |
1604 | break_allowed = 1; | |
1605 | } | |
1606 | do { | |
1607 | /* | |
1608 | * Wait for assertion of REQ, after which the phase bits will be | |
1609 | * valid | |
1610 | */ | |
1611 | ||
1612 | /* RvC: we simply poll once, after that we stop temporarily | |
1613 | * and let the device buffer fill up | |
1614 | * if breaking is not allowed, we keep polling as long as needed | |
1615 | */ | |
1616 | ||
1617 | /* FIXME */ | |
1618 | while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed); | |
1619 | if (!(tmp & SR_REQ)) { | |
1620 | /* timeout condition */ | |
1621 | NCR5380_set_timer(hostdata, USLEEP_SLEEP); | |
1622 | break; | |
1623 | } | |
1624 | ||
1625 | dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no)); | |
1626 | ||
1627 | /* Check for phase mismatch */ | |
1628 | if ((tmp & PHASE_MASK) != p) { | |
1629 | dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no)); | |
1630 | NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance); | |
1631 | break; | |
1632 | } | |
1633 | /* Do actual transfer from SCSI bus to / from memory */ | |
1634 | if (!(p & SR_IO)) | |
1635 | NCR5380_write(OUTPUT_DATA_REG, *d); | |
1636 | else | |
1637 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
1638 | ||
1639 | ++d; | |
1640 | ||
1641 | /* | |
1642 | * The SCSI standard suggests that in MSGOUT phase, the initiator | |
1643 | * should drop ATN on the last byte of the message phase | |
1644 | * after REQ has been asserted for the handshake but before | |
1645 | * the initiator raises ACK. | |
1646 | */ | |
1647 | ||
1648 | if (!(p & SR_IO)) { | |
1649 | if (!((p & SR_MSG) && c > 1)) { | |
1650 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1651 | NCR5380_dprint(NDEBUG_PIO, instance); | |
1652 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK); | |
1653 | } else { | |
1654 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN); | |
1655 | NCR5380_dprint(NDEBUG_PIO, instance); | |
1656 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1657 | } | |
1658 | } else { | |
1659 | NCR5380_dprint(NDEBUG_PIO, instance); | |
1660 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); | |
1661 | } | |
1662 | ||
1663 | /* FIXME - if this fails bus reset ?? */ | |
1664 | NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ); | |
1665 | dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no)); | |
1666 | ||
1667 | /* | |
1668 | * We have several special cases to consider during REQ/ACK handshaking : | |
1669 | * 1. We were in MSGOUT phase, and we are on the last byte of the | |
1670 | * message. ATN must be dropped as ACK is dropped. | |
1671 | * | |
1672 | * 2. We are in a MSGIN phase, and we are on the last byte of the | |
1673 | * message. We must exit with ACK asserted, so that the calling | |
1674 | * code may raise ATN before dropping ACK to reject the message. | |
1675 | * | |
1676 | * 3. ACK and ATN are clear and the target may proceed as normal. | |
1677 | */ | |
1678 | if (!(p == PHASE_MSGIN && c == 1)) { | |
1679 | if (p == PHASE_MSGOUT && c > 1) | |
1680 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1681 | else | |
1682 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1683 | } | |
1684 | } while (--c); | |
1685 | ||
1686 | dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c)); | |
1687 | ||
1688 | *count = c; | |
1689 | *data = d; | |
1690 | tmp = NCR5380_read(STATUS_REG); | |
1691 | if (tmp & SR_REQ) | |
1692 | *phase = tmp & PHASE_MASK; | |
1693 | else | |
1694 | *phase = PHASE_UNKNOWN; | |
1695 | ||
1696 | if (!c || (*phase == p)) | |
1697 | return 0; | |
1698 | else | |
1699 | return -1; | |
1700 | } | |
1701 | ||
1702 | /** | |
1703 | * do_reset - issue a reset command | |
1704 | * @host: adapter to reset | |
1705 | * | |
1706 | * Issue a reset sequence to the NCR5380 and try and get the bus | |
1707 | * back into sane shape. | |
1708 | * | |
1709 | * Locks: caller holds queue lock | |
1710 | */ | |
1711 | ||
1712 | static void do_reset(struct Scsi_Host *host) { | |
1713 | NCR5380_local_declare(); | |
1714 | NCR5380_setup(host); | |
1715 | ||
1716 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); | |
1717 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); | |
1718 | udelay(25); | |
1719 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1720 | } | |
1721 | ||
1722 | /* | |
1723 | * Function : do_abort (Scsi_Host *host) | |
1724 | * | |
1725 | * Purpose : abort the currently established nexus. Should only be | |
1726 | * called from a routine which can drop into a | |
1727 | * | |
1728 | * Returns : 0 on success, -1 on failure. | |
1729 | * | |
1730 | * Locks: queue lock held by caller | |
1731 | * FIXME: sort this out and get new_eh running | |
1732 | */ | |
1733 | ||
1734 | static int do_abort(struct Scsi_Host *host) { | |
1735 | NCR5380_local_declare(); | |
1736 | unsigned char *msgptr, phase, tmp; | |
1737 | int len; | |
1738 | int rc; | |
1739 | NCR5380_setup(host); | |
1740 | ||
1741 | ||
1742 | /* Request message out phase */ | |
1743 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1744 | ||
1745 | /* | |
1746 | * Wait for the target to indicate a valid phase by asserting | |
1747 | * REQ. Once this happens, we'll have either a MSGOUT phase | |
1748 | * and can immediately send the ABORT message, or we'll have some | |
1749 | * other phase and will have to source/sink data. | |
1750 | * | |
1751 | * We really don't care what value was on the bus or what value | |
1752 | * the target sees, so we just handshake. | |
1753 | */ | |
1754 | ||
1755 | rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ); | |
1756 | ||
1757 | if(rc < 0) | |
1758 | return -1; | |
1759 | ||
1760 | tmp = (unsigned char)rc; | |
1761 | ||
1762 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1763 | ||
1764 | if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { | |
1765 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1766 | rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ); | |
1767 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1768 | if(rc == -1) | |
1769 | return -1; | |
1770 | } | |
1771 | tmp = ABORT; | |
1772 | msgptr = &tmp; | |
1773 | len = 1; | |
1774 | phase = PHASE_MSGOUT; | |
1775 | NCR5380_transfer_pio(host, &phase, &len, &msgptr); | |
1776 | ||
1777 | /* | |
1778 | * If we got here, and the command completed successfully, | |
1779 | * we're about to go into bus free state. | |
1780 | */ | |
1781 | ||
1782 | return len ? -1 : 0; | |
1783 | } | |
1784 | ||
1785 | #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL) | |
1786 | /* | |
1787 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, | |
1788 | * unsigned char *phase, int *count, unsigned char **data) | |
1789 | * | |
1790 | * Purpose : transfers data in given phase using either real | |
1791 | * or pseudo DMA. | |
1792 | * | |
1793 | * Inputs : instance - instance of driver, *phase - pointer to | |
1794 | * what phase is expected, *count - pointer to number of | |
1795 | * bytes to transfer, **data - pointer to data pointer. | |
1796 | * | |
1797 | * Returns : -1 when different phase is entered without transferring | |
1798 | * maximum number of bytes, 0 if all bytes or transfered or exit | |
1799 | * is in same phase. | |
1800 | * | |
1801 | * Also, *phase, *count, *data are modified in place. | |
1802 | * | |
1803 | * Locks: io_request lock held by caller | |
1804 | */ | |
1805 | ||
1806 | ||
1807 | static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { | |
1808 | NCR5380_local_declare(); | |
1809 | register int c = *count; | |
1810 | register unsigned char p = *phase; | |
1811 | register unsigned char *d = *data; | |
1812 | unsigned char tmp; | |
1813 | int foo; | |
1814 | #if defined(REAL_DMA_POLL) | |
1815 | int cnt, toPIO; | |
1816 | unsigned char saved_data = 0, overrun = 0, residue; | |
1817 | #endif | |
1818 | ||
1819 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
1820 | ||
1821 | NCR5380_setup(instance); | |
1822 | ||
1823 | if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { | |
1824 | *phase = tmp; | |
1825 | return -1; | |
1826 | } | |
1827 | #if defined(REAL_DMA) || defined(REAL_DMA_POLL) | |
1828 | #ifdef READ_OVERRUNS | |
1829 | if (p & SR_IO) { | |
1830 | c -= 2; | |
1831 | } | |
1832 | #endif | |
1833 | 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)); | |
1834 | hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c); | |
1835 | #endif | |
1836 | ||
1837 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); | |
1838 | ||
1839 | #ifdef REAL_DMA | |
1840 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); | |
1841 | #elif defined(REAL_DMA_POLL) | |
1842 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); | |
1843 | #else | |
1844 | /* | |
1845 | * Note : on my sample board, watch-dog timeouts occurred when interrupts | |
1846 | * were not disabled for the duration of a single DMA transfer, from | |
1847 | * before the setting of DMA mode to after transfer of the last byte. | |
1848 | */ | |
1849 | ||
1850 | #if defined(PSEUDO_DMA) && defined(UNSAFE) | |
1851 | spin_unlock_irq(instance->host_lock); | |
1852 | #endif | |
1853 | /* KLL May need eop and parity in 53c400 */ | |
1854 | if (hostdata->flags & FLAG_NCR53C400) | |
1855 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR | MR_ENABLE_EOP_INTR | MR_DMA_MODE | MR_MONITOR_BSY); | |
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->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 = page_address(cmd->SCp.buffer->page)+ | |
2142 | cmd->SCp.buffer->offset; | |
2143 | dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual)); | |
2144 | } | |
2145 | /* | |
2146 | * The preferred transfer method is going to be | |
2147 | * PSEUDO-DMA for systems that are strictly PIO, | |
2148 | * since we can let the hardware do the handshaking. | |
2149 | * | |
2150 | * For this to work, we need to know the transfersize | |
2151 | * ahead of time, since the pseudo-DMA code will sit | |
2152 | * in an unconditional loop. | |
2153 | */ | |
2154 | ||
2155 | #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) | |
2156 | /* KLL | |
2157 | * PSEUDO_DMA is defined here. If this is the g_NCR5380 | |
2158 | * driver then it will always be defined, so the | |
2159 | * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base | |
2160 | * NCR5380 case. I think this is a fairly clean solution. | |
2161 | * We supplement these 2 if's with the flag. | |
2162 | */ | |
2163 | #ifdef NCR5380_dma_xfer_len | |
2164 | if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) { | |
2165 | #else | |
2166 | transfersize = cmd->transfersize; | |
2167 | ||
2168 | #ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */ | |
2169 | if (transfersize > 512) | |
2170 | transfersize = 512; | |
2171 | #endif /* LIMIT_TRANSFERSIZE */ | |
2172 | ||
2173 | if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) { | |
2174 | /* Limit transfers to 32K, for xx400 & xx406 | |
2175 | * pseudoDMA that transfers in 128 bytes blocks. */ | |
2176 | if (transfersize > 32 * 1024) | |
2177 | transfersize = 32 * 1024; | |
2178 | #endif | |
2179 | len = transfersize; | |
2180 | if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) { | |
2181 | /* | |
2182 | * If the watchdog timer fires, all future accesses to this | |
2183 | * device will use the polled-IO. | |
2184 | */ | |
2185 | printk("scsi%d : switching target %d lun %d to slow handshake\n", instance->host_no, cmd->device->id, cmd->device->lun); | |
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->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) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { | |
2276 | dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no)); | |
2277 | cmd->cmnd[0] = REQUEST_SENSE; | |
2278 | cmd->cmnd[1] &= 0xe0; | |
2279 | cmd->cmnd[2] = 0; | |
2280 | cmd->cmnd[3] = 0; | |
2281 | cmd->cmnd[4] = sizeof(cmd->sense_buffer); | |
2282 | cmd->cmnd[5] = 0; | |
2283 | ||
2284 | cmd->SCp.buffer = NULL; | |
2285 | cmd->SCp.buffers_residual = 0; | |
2286 | cmd->SCp.ptr = (char *) cmd->sense_buffer; | |
2287 | cmd->SCp.this_residual = sizeof(cmd->sense_buffer); | |
2288 | ||
2289 | LIST(cmd, hostdata->issue_queue); | |
2290 | cmd->host_scribble = (unsigned char *) | |
2291 | hostdata->issue_queue; | |
2292 | hostdata->issue_queue = (Scsi_Cmnd *) cmd; | |
2293 | dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no)); | |
2294 | } else | |
2295 | #endif /* def AUTOSENSE */ | |
2296 | { | |
2297 | collect_stats(hostdata, cmd); | |
2298 | cmd->scsi_done(cmd); | |
2299 | } | |
2300 | ||
2301 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2302 | /* | |
2303 | * Restore phase bits to 0 so an interrupted selection, | |
2304 | * arbitration can resume. | |
2305 | */ | |
2306 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2307 | ||
2308 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) | |
2309 | barrier(); | |
2310 | return; | |
2311 | case MESSAGE_REJECT: | |
2312 | /* Accept message by clearing ACK */ | |
2313 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2314 | switch (hostdata->last_message) { | |
2315 | case HEAD_OF_QUEUE_TAG: | |
2316 | case ORDERED_QUEUE_TAG: | |
2317 | case SIMPLE_QUEUE_TAG: | |
2318 | cmd->device->simple_tags = 0; | |
2319 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); | |
2320 | break; | |
2321 | default: | |
2322 | break; | |
2323 | } | |
2324 | case DISCONNECT:{ | |
2325 | /* Accept message by clearing ACK */ | |
2326 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2327 | cmd->device->disconnect = 1; | |
2328 | LIST(cmd, hostdata->disconnected_queue); | |
2329 | cmd->host_scribble = (unsigned char *) | |
2330 | hostdata->disconnected_queue; | |
2331 | hostdata->connected = NULL; | |
2332 | hostdata->disconnected_queue = cmd; | |
2333 | 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)); | |
2334 | /* | |
2335 | * Restore phase bits to 0 so an interrupted selection, | |
2336 | * arbitration can resume. | |
2337 | */ | |
2338 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2339 | ||
2340 | /* Enable reselect interrupts */ | |
2341 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2342 | /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/ | |
2343 | /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */ | |
2344 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) | |
2345 | barrier(); | |
2346 | return; | |
2347 | } | |
2348 | /* | |
2349 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect | |
2350 | * operation, in violation of the SCSI spec so we can safely | |
2351 | * ignore SAVE/RESTORE pointers calls. | |
2352 | * | |
2353 | * Unfortunately, some disks violate the SCSI spec and | |
2354 | * don't issue the required SAVE_POINTERS message before | |
2355 | * disconnecting, and we have to break spec to remain | |
2356 | * compatible. | |
2357 | */ | |
2358 | case SAVE_POINTERS: | |
2359 | case RESTORE_POINTERS: | |
2360 | /* Accept message by clearing ACK */ | |
2361 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2362 | break; | |
2363 | case EXTENDED_MESSAGE: | |
2364 | /* | |
2365 | * Extended messages are sent in the following format : | |
2366 | * Byte | |
2367 | * 0 EXTENDED_MESSAGE == 1 | |
2368 | * 1 length (includes one byte for code, doesn't | |
2369 | * include first two bytes) | |
2370 | * 2 code | |
2371 | * 3..length+1 arguments | |
2372 | * | |
2373 | * Start the extended message buffer with the EXTENDED_MESSAGE | |
2374 | * byte, since print_msg() wants the whole thing. | |
2375 | */ | |
2376 | extended_msg[0] = EXTENDED_MESSAGE; | |
2377 | /* Accept first byte by clearing ACK */ | |
2378 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2379 | dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no)); | |
2380 | ||
2381 | len = 2; | |
2382 | data = extended_msg + 1; | |
2383 | phase = PHASE_MSGIN; | |
2384 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2385 | ||
2386 | dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2])); | |
2387 | ||
2388 | if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) { | |
2389 | /* Accept third byte by clearing ACK */ | |
2390 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2391 | len = extended_msg[1] - 1; | |
2392 | data = extended_msg + 3; | |
2393 | phase = PHASE_MSGIN; | |
2394 | ||
2395 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2396 | dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len)); | |
2397 | ||
2398 | switch (extended_msg[2]) { | |
2399 | case EXTENDED_SDTR: | |
2400 | case EXTENDED_WDTR: | |
2401 | case EXTENDED_MODIFY_DATA_POINTER: | |
2402 | case EXTENDED_EXTENDED_IDENTIFY: | |
2403 | tmp = 0; | |
2404 | } | |
2405 | } else if (len) { | |
2406 | printk("scsi%d: error receiving extended message\n", instance->host_no); | |
2407 | tmp = 0; | |
2408 | } else { | |
2409 | printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]); | |
2410 | tmp = 0; | |
2411 | } | |
2412 | /* Fall through to reject message */ | |
2413 | ||
2414 | /* | |
2415 | * If we get something weird that we aren't expecting, | |
2416 | * reject it. | |
2417 | */ | |
2418 | default: | |
2419 | if (!tmp) { | |
2420 | printk("scsi%d: rejecting message ", instance->host_no); | |
2421 | print_msg(extended_msg); | |
2422 | printk("\n"); | |
2423 | } else if (tmp != EXTENDED_MESSAGE) | |
2424 | printk("scsi%d: rejecting unknown message %02x from target %d, lun %d\n", instance->host_no, tmp, cmd->device->id, cmd->device->lun); | |
2425 | else | |
2426 | printk("scsi%d: rejecting unknown extended message code %02x, length %d from target %d, lun %d\n", instance->host_no, extended_msg[1], extended_msg[0], cmd->device->id, cmd->device->lun); | |
2427 | ||
2428 | msgout = MESSAGE_REJECT; | |
2429 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
2430 | break; | |
2431 | } /* switch (tmp) */ | |
2432 | break; | |
2433 | case PHASE_MSGOUT: | |
2434 | len = 1; | |
2435 | data = &msgout; | |
2436 | hostdata->last_message = msgout; | |
2437 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2438 | if (msgout == ABORT) { | |
2439 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); | |
2440 | hostdata->connected = NULL; | |
2441 | cmd->result = DID_ERROR << 16; | |
2442 | collect_stats(hostdata, cmd); | |
2443 | cmd->scsi_done(cmd); | |
2444 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2445 | return; | |
2446 | } | |
2447 | msgout = NOP; | |
2448 | break; | |
2449 | case PHASE_CMDOUT: | |
2450 | len = cmd->cmd_len; | |
2451 | data = cmd->cmnd; | |
2452 | /* | |
2453 | * XXX for performance reasons, on machines with a | |
2454 | * PSEUDO-DMA architecture we should probably | |
2455 | * use the dma transfer function. | |
2456 | */ | |
2457 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2458 | if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) { | |
2459 | NCR5380_set_timer(hostdata, USLEEP_SLEEP); | |
2460 | dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); | |
2461 | return; | |
2462 | } | |
2463 | break; | |
2464 | case PHASE_STATIN: | |
2465 | len = 1; | |
2466 | data = &tmp; | |
2467 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2468 | cmd->SCp.Status = tmp; | |
2469 | break; | |
2470 | default: | |
2471 | printk("scsi%d : unknown phase\n", instance->host_no); | |
2472 | NCR5380_dprint(NDEBUG_ALL, instance); | |
2473 | } /* switch(phase) */ | |
2474 | } /* if (tmp * SR_REQ) */ | |
2475 | else { | |
2476 | /* RvC: go to sleep if polling time expired | |
2477 | */ | |
2478 | if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) { | |
2479 | NCR5380_set_timer(hostdata, USLEEP_SLEEP); | |
2480 | dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); | |
2481 | return; | |
2482 | } | |
2483 | } | |
2484 | } /* while (1) */ | |
2485 | } | |
2486 | ||
2487 | /* | |
2488 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) | |
2489 | * | |
2490 | * Purpose : does reselection, initializing the instance->connected | |
2491 | * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q | |
2492 | * nexus has been reestablished, | |
2493 | * | |
2494 | * Inputs : instance - this instance of the NCR5380. | |
2495 | * | |
2496 | * Locks: io_request_lock held by caller if IRQ driven | |
2497 | */ | |
2498 | ||
2499 | static void NCR5380_reselect(struct Scsi_Host *instance) { | |
2500 | NCR5380_local_declare(); | |
2501 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) | |
2502 | instance->hostdata; | |
2503 | unsigned char target_mask; | |
2504 | unsigned char lun, phase; | |
2505 | int len; | |
2506 | unsigned char msg[3]; | |
2507 | unsigned char *data; | |
2508 | Scsi_Cmnd *tmp = NULL, *prev; | |
2509 | int abort = 0; | |
2510 | NCR5380_setup(instance); | |
2511 | ||
2512 | /* | |
2513 | * Disable arbitration, etc. since the host adapter obviously | |
2514 | * lost, and tell an interrupted NCR5380_select() to restart. | |
2515 | */ | |
2516 | ||
2517 | NCR5380_write(MODE_REG, MR_BASE); | |
2518 | hostdata->restart_select = 1; | |
2519 | ||
2520 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); | |
2521 | dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no)); | |
2522 | ||
2523 | /* | |
2524 | * At this point, we have detected that our SCSI ID is on the bus, | |
2525 | * SEL is true and BSY was false for at least one bus settle delay | |
2526 | * (400 ns). | |
2527 | * | |
2528 | * We must assert BSY ourselves, until the target drops the SEL | |
2529 | * signal. | |
2530 | */ | |
2531 | ||
2532 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); | |
2533 | ||
2534 | /* FIXME: timeout too long, must fail to workqueue */ | |
2535 | if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0) | |
2536 | abort = 1; | |
2537 | ||
2538 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2539 | ||
2540 | /* | |
2541 | * Wait for target to go into MSGIN. | |
2542 | * FIXME: timeout needed and fail to work queeu | |
2543 | */ | |
2544 | ||
2545 | if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ)) | |
2546 | abort = 1; | |
2547 | ||
2548 | len = 1; | |
2549 | data = msg; | |
2550 | phase = PHASE_MSGIN; | |
2551 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2552 | ||
2553 | if (!(msg[0] & 0x80)) { | |
2554 | printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no); | |
2555 | print_msg(msg); | |
2556 | abort = 1; | |
2557 | } else { | |
2558 | /* Accept message by clearing ACK */ | |
2559 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2560 | lun = (msg[0] & 0x07); | |
2561 | ||
2562 | /* | |
2563 | * We need to add code for SCSI-II to track which devices have | |
2564 | * I_T_L_Q nexuses established, and which have simple I_T_L | |
2565 | * nexuses so we can chose to do additional data transfer. | |
2566 | */ | |
2567 | ||
2568 | /* | |
2569 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we | |
2570 | * just reestablished, and remove it from the disconnected queue. | |
2571 | */ | |
2572 | ||
2573 | ||
2574 | for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) | |
2575 | if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) | |
2576 | ) { | |
2577 | if (prev) { | |
2578 | REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); | |
2579 | prev->host_scribble = tmp->host_scribble; | |
2580 | } else { | |
2581 | REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble); | |
2582 | hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble; | |
2583 | } | |
2584 | tmp->host_scribble = NULL; | |
2585 | break; | |
2586 | } | |
2587 | if (!tmp) { | |
2588 | printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun); | |
2589 | /* | |
2590 | * Since we have an established nexus that we can't do anything with, | |
2591 | * we must abort it. | |
2592 | */ | |
2593 | abort = 1; | |
2594 | } | |
2595 | } | |
2596 | ||
2597 | if (abort) { | |
2598 | do_abort(instance); | |
2599 | } else { | |
2600 | hostdata->connected = tmp; | |
2601 | dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag)); | |
2602 | } | |
2603 | } | |
2604 | ||
2605 | /* | |
2606 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) | |
2607 | * | |
2608 | * Purpose : called by interrupt handler when DMA finishes or a phase | |
2609 | * mismatch occurs (which would finish the DMA transfer). | |
2610 | * | |
2611 | * Inputs : instance - this instance of the NCR5380. | |
2612 | * | |
2613 | * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L | |
2614 | * nexus has been reestablished, on failure NULL is returned. | |
2615 | */ | |
2616 | ||
2617 | #ifdef REAL_DMA | |
2618 | static void NCR5380_dma_complete(NCR5380_instance * instance) { | |
2619 | NCR5380_local_declare(); | |
2620 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata * instance->hostdata); | |
2621 | int transferred; | |
2622 | NCR5380_setup(instance); | |
2623 | ||
2624 | /* | |
2625 | * XXX this might not be right. | |
2626 | * | |
2627 | * Wait for final byte to transfer, ie wait for ACK to go false. | |
2628 | * | |
2629 | * We should use the Last Byte Sent bit, unfortunately this is | |
2630 | * not available on the 5380/5381 (only the various CMOS chips) | |
2631 | * | |
2632 | * FIXME: timeout, and need to handle long timeout/irq case | |
2633 | */ | |
2634 | ||
2635 | NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ); | |
2636 | ||
2637 | NCR5380_write(MODE_REG, MR_BASE); | |
2638 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2639 | ||
2640 | /* | |
2641 | * The only places we should see a phase mismatch and have to send | |
2642 | * data from the same set of pointers will be the data transfer | |
2643 | * phases. So, residual, requested length are only important here. | |
2644 | */ | |
2645 | ||
2646 | if (!(hostdata->connected->SCp.phase & SR_CD)) { | |
2647 | transferred = instance->dmalen - NCR5380_dma_residual(); | |
2648 | hostdata->connected->SCp.this_residual -= transferred; | |
2649 | hostdata->connected->SCp.ptr += transferred; | |
2650 | } | |
2651 | } | |
2652 | #endif /* def REAL_DMA */ | |
2653 | ||
2654 | /* | |
2655 | * Function : int NCR5380_abort (Scsi_Cmnd *cmd) | |
2656 | * | |
2657 | * Purpose : abort a command | |
2658 | * | |
2659 | * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the | |
2660 | * host byte of the result field to, if zero DID_ABORTED is | |
2661 | * used. | |
2662 | * | |
2663 | * Returns : 0 - success, -1 on failure. | |
2664 | * | |
2665 | * XXX - there is no way to abort the command that is currently | |
2666 | * connected, you have to wait for it to complete. If this is | |
2667 | * a problem, we could implement longjmp() / setjmp(), setjmp() | |
2668 | * called where the loop started in NCR5380_main(). | |
2669 | * | |
2670 | * Locks: host lock taken by caller | |
2671 | */ | |
2672 | ||
2673 | static int NCR5380_abort(Scsi_Cmnd * cmd) { | |
2674 | NCR5380_local_declare(); | |
2675 | struct Scsi_Host *instance = cmd->device->host; | |
2676 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
2677 | Scsi_Cmnd *tmp, **prev; | |
2678 | ||
2679 | printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no); | |
2680 | print_Scsi_Cmnd(cmd); | |
2681 | ||
2682 | NCR5380_print_status(instance); | |
2683 | ||
2684 | NCR5380_setup(instance); | |
2685 | ||
2686 | dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no)); | |
2687 | dprintk(NDEBUG_ABORT, (" basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG))); | |
2688 | ||
2689 | #if 0 | |
2690 | /* | |
2691 | * Case 1 : If the command is the currently executing command, | |
2692 | * we'll set the aborted flag and return control so that | |
2693 | * information transfer routine can exit cleanly. | |
2694 | */ | |
2695 | ||
2696 | if (hostdata->connected == cmd) { | |
2697 | dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no)); | |
2698 | hostdata->aborted = 1; | |
2699 | /* | |
2700 | * We should perform BSY checking, and make sure we haven't slipped | |
2701 | * into BUS FREE. | |
2702 | */ | |
2703 | ||
2704 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); | |
2705 | /* | |
2706 | * Since we can't change phases until we've completed the current | |
2707 | * handshake, we have to source or sink a byte of data if the current | |
2708 | * phase is not MSGOUT. | |
2709 | */ | |
2710 | ||
2711 | /* | |
2712 | * Return control to the executing NCR drive so we can clear the | |
2713 | * aborted flag and get back into our main loop. | |
2714 | */ | |
2715 | ||
2716 | return 0; | |
2717 | } | |
2718 | #endif | |
2719 | ||
2720 | /* | |
2721 | * Case 2 : If the command hasn't been issued yet, we simply remove it | |
2722 | * from the issue queue. | |
2723 | */ | |
2724 | ||
2725 | dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no)); | |
2726 | 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) | |
2727 | if (cmd == tmp) { | |
2728 | REMOVE(5, *prev, tmp, tmp->host_scribble); | |
2729 | (*prev) = (Scsi_Cmnd *) tmp->host_scribble; | |
2730 | tmp->host_scribble = NULL; | |
2731 | tmp->result = DID_ABORT << 16; | |
2732 | dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no)); | |
2733 | tmp->done(tmp); | |
2734 | return SUCCESS; | |
2735 | } | |
2736 | #if (NDEBUG & NDEBUG_ABORT) | |
2737 | /* KLL */ | |
2738 | else if (prev == tmp) | |
2739 | printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no); | |
2740 | #endif | |
2741 | ||
2742 | /* | |
2743 | * Case 3 : If any commands are connected, we're going to fail the abort | |
2744 | * and let the high level SCSI driver retry at a later time or | |
2745 | * issue a reset. | |
2746 | * | |
2747 | * Timeouts, and therefore aborted commands, will be highly unlikely | |
2748 | * and handling them cleanly in this situation would make the common | |
2749 | * case of noresets less efficient, and would pollute our code. So, | |
2750 | * we fail. | |
2751 | */ | |
2752 | ||
2753 | if (hostdata->connected) { | |
2754 | dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no)); | |
2755 | return FAILED; | |
2756 | } | |
2757 | /* | |
2758 | * Case 4: If the command is currently disconnected from the bus, and | |
2759 | * there are no connected commands, we reconnect the I_T_L or | |
2760 | * I_T_L_Q nexus associated with it, go into message out, and send | |
2761 | * an abort message. | |
2762 | * | |
2763 | * This case is especially ugly. In order to reestablish the nexus, we | |
2764 | * need to call NCR5380_select(). The easiest way to implement this | |
2765 | * function was to abort if the bus was busy, and let the interrupt | |
2766 | * handler triggered on the SEL for reselect take care of lost arbitrations | |
2767 | * where necessary, meaning interrupts need to be enabled. | |
2768 | * | |
2769 | * When interrupts are enabled, the queues may change - so we | |
2770 | * can't remove it from the disconnected queue before selecting it | |
2771 | * because that could cause a failure in hashing the nexus if that | |
2772 | * device reselected. | |
2773 | * | |
2774 | * Since the queues may change, we can't use the pointers from when we | |
2775 | * first locate it. | |
2776 | * | |
2777 | * So, we must first locate the command, and if NCR5380_select() | |
2778 | * succeeds, then issue the abort, relocate the command and remove | |
2779 | * it from the disconnected queue. | |
2780 | */ | |
2781 | ||
2782 | for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble) | |
2783 | if (cmd == tmp) { | |
2784 | dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no)); | |
2785 | ||
2786 | if (NCR5380_select(instance, cmd, (int) cmd->tag)) | |
2787 | return FAILED; | |
2788 | dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no)); | |
2789 | ||
2790 | do_abort(instance); | |
2791 | ||
2792 | 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) | |
2793 | if (cmd == tmp) { | |
2794 | REMOVE(5, *prev, tmp, tmp->host_scribble); | |
2795 | *prev = (Scsi_Cmnd *) tmp->host_scribble; | |
2796 | tmp->host_scribble = NULL; | |
2797 | tmp->result = DID_ABORT << 16; | |
2798 | tmp->done(tmp); | |
2799 | return SUCCESS; | |
2800 | } | |
2801 | } | |
2802 | /* | |
2803 | * Case 5 : If we reached this point, the command was not found in any of | |
2804 | * the queues. | |
2805 | * | |
2806 | * We probably reached this point because of an unlikely race condition | |
2807 | * between the command completing successfully and the abortion code, | |
2808 | * so we won't panic, but we will notify the user in case something really | |
2809 | * broke. | |
2810 | */ | |
2811 | printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n" | |
2812 | " before abortion\n", instance->host_no); | |
2813 | return FAILED; | |
2814 | } | |
2815 | ||
2816 | ||
2817 | /* | |
2818 | * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd) | |
2819 | * | |
2820 | * Purpose : reset the SCSI bus. | |
2821 | * | |
2822 | * Returns : SUCCESS | |
2823 | * | |
2824 | * Locks: host lock taken by caller | |
2825 | */ | |
2826 | ||
2827 | static int NCR5380_bus_reset(Scsi_Cmnd * cmd) { | |
2828 | NCR5380_local_declare(); | |
2829 | NCR5380_setup(cmd->device->host); | |
2830 | ||
2831 | NCR5380_print_status(cmd->device->host); | |
2832 | do_reset(cmd->device->host); | |
2833 | return SUCCESS; | |
2834 | } | |
2835 | ||
2836 | /* | |
2837 | * Function : int NCR5380_device_reset (Scsi_Cmnd *cmd) | |
2838 | * | |
2839 | * Purpose : reset a SCSI device | |
2840 | * | |
2841 | * Returns : FAILED | |
2842 | * | |
2843 | * Locks: io_request_lock held by caller | |
2844 | */ | |
2845 | ||
2846 | static int NCR5380_device_reset(Scsi_Cmnd * cmd) { | |
2847 | return FAILED; | |
2848 | } | |
2849 | ||
2850 | /* | |
2851 | * Function : int NCR5380_host_reset (Scsi_Cmnd *cmd) | |
2852 | * | |
2853 | * Purpose : reset a SCSI device | |
2854 | * | |
2855 | * Returns : FAILED | |
2856 | * | |
2857 | * Locks: io_request_lock held by caller | |
2858 | */ | |
2859 | ||
2860 | static int NCR5380_host_reset(Scsi_Cmnd * cmd) { | |
2861 | return FAILED; | |
2862 | } |