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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 | * | |
1da177e4 LT |
14 | * For more information, please consult |
15 | * | |
16 | * NCR 5380 Family | |
17 | * SCSI Protocol Controller | |
18 | * Databook | |
19 | * | |
20 | * NCR Microelectronics | |
21 | * 1635 Aeroplaza Drive | |
22 | * Colorado Springs, CO 80916 | |
23 | * 1+ (719) 578-3400 | |
24 | * 1+ (800) 334-5454 | |
25 | */ | |
26 | ||
27 | /* | |
1da177e4 | 28 | * Revision 1.10 1998/9/2 Alan Cox |
fa195afe | 29 | * (alan@lxorguk.ukuu.org.uk) |
1da177e4 LT |
30 | * Fixed up the timer lockups reported so far. Things still suck. Looking |
31 | * forward to 2.3 and per device request queues. Then it'll be possible to | |
32 | * SMP thread this beast and improve life no end. | |
33 | ||
34 | * Revision 1.9 1997/7/27 Ronald van Cuijlenborg | |
35 | * (ronald.van.cuijlenborg@tip.nl or nutty@dds.nl) | |
36 | * (hopefully) fixed and enhanced USLEEP | |
37 | * added support for DTC3181E card (for Mustek scanner) | |
38 | * | |
39 | ||
40 | * Revision 1.8 Ingmar Baumgart | |
41 | * (ingmar@gonzo.schwaben.de) | |
42 | * added support for NCR53C400a card | |
43 | * | |
44 | ||
45 | * Revision 1.7 1996/3/2 Ray Van Tassle (rayvt@comm.mot.com) | |
46 | * added proc_info | |
47 | * added support needed for DTC 3180/3280 | |
48 | * fixed a couple of bugs | |
49 | * | |
50 | ||
51 | * Revision 1.5 1994/01/19 09:14:57 drew | |
52 | * Fixed udelay() hack that was being used on DATAOUT phases | |
53 | * instead of a proper wait for the final handshake. | |
54 | * | |
55 | * Revision 1.4 1994/01/19 06:44:25 drew | |
56 | * *** empty log message *** | |
57 | * | |
58 | * Revision 1.3 1994/01/19 05:24:40 drew | |
59 | * Added support for TCR LAST_BYTE_SENT bit. | |
60 | * | |
61 | * Revision 1.2 1994/01/15 06:14:11 drew | |
62 | * REAL DMA support, bug fixes. | |
63 | * | |
64 | * Revision 1.1 1994/01/15 06:00:54 drew | |
65 | * Initial revision | |
66 | * | |
67 | */ | |
68 | ||
69 | /* | |
70 | * Further development / testing that should be done : | |
71 | * 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete | |
72 | * code so that everything does the same thing that's done at the | |
73 | * end of a pseudo-DMA read operation. | |
74 | * | |
75 | * 2. Fix REAL_DMA (interrupt driven, polled works fine) - | |
76 | * basically, transfer size needs to be reduced by one | |
77 | * and the last byte read as is done with PSEUDO_DMA. | |
78 | * | |
79 | * 4. Test SCSI-II tagged queueing (I have no devices which support | |
80 | * tagged queueing) | |
81 | * | |
82 | * 5. Test linked command handling code after Eric is ready with | |
83 | * the high level code. | |
84 | */ | |
db9dff36 | 85 | #include <scsi/scsi_dbg.h> |
1abfd370 | 86 | #include <scsi/scsi_transport_spi.h> |
1da177e4 LT |
87 | |
88 | #if (NDEBUG & NDEBUG_LISTS) | |
89 | #define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); } | |
90 | #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); } | |
91 | #else | |
92 | #define LIST(x,y) | |
93 | #define REMOVE(w,x,y,z) | |
94 | #endif | |
95 | ||
96 | #ifndef notyet | |
97 | #undef LINKED | |
98 | #undef REAL_DMA | |
99 | #endif | |
100 | ||
101 | #ifdef REAL_DMA_POLL | |
102 | #undef READ_OVERRUNS | |
103 | #define READ_OVERRUNS | |
104 | #endif | |
105 | ||
106 | #ifdef BOARD_REQUIRES_NO_DELAY | |
107 | #define io_recovery_delay(x) | |
108 | #else | |
109 | #define io_recovery_delay(x) udelay(x) | |
110 | #endif | |
111 | ||
112 | /* | |
113 | * Design | |
114 | * | |
115 | * This is a generic 5380 driver. To use it on a different platform, | |
116 | * one simply writes appropriate system specific macros (ie, data | |
117 | * transfer - some PC's will use the I/O bus, 68K's must use | |
118 | * memory mapped) and drops this file in their 'C' wrapper. | |
119 | * | |
120 | * (Note from hch: unfortunately it was not enough for the different | |
121 | * m68k folks and instead of improving this driver they copied it | |
122 | * and hacked it up for their needs. As a consequence they lost | |
123 | * most updates to this driver. Maybe someone will fix all these | |
124 | * drivers to use a common core one day..) | |
125 | * | |
126 | * As far as command queueing, two queues are maintained for | |
127 | * each 5380 in the system - commands that haven't been issued yet, | |
128 | * and commands that are currently executing. This means that an | |
129 | * unlimited number of commands may be queued, letting | |
130 | * more commands propagate from the higher driver levels giving higher | |
131 | * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, | |
132 | * allowing multiple commands to propagate all the way to a SCSI-II device | |
133 | * while a command is already executing. | |
134 | * | |
135 | * | |
136 | * Issues specific to the NCR5380 : | |
137 | * | |
138 | * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead | |
139 | * piece of hardware that requires you to sit in a loop polling for | |
140 | * the REQ signal as long as you are connected. Some devices are | |
141 | * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect | |
142 | * while doing long seek operations. | |
143 | * | |
144 | * The workaround for this is to keep track of devices that have | |
145 | * disconnected. If the device hasn't disconnected, for commands that | |
146 | * should disconnect, we do something like | |
147 | * | |
148 | * while (!REQ is asserted) { sleep for N usecs; poll for M usecs } | |
149 | * | |
150 | * Some tweaking of N and M needs to be done. An algorithm based | |
151 | * on "time to data" would give the best results as long as short time | |
152 | * to datas (ie, on the same track) were considered, however these | |
153 | * broken devices are the exception rather than the rule and I'd rather | |
154 | * spend my time optimizing for the normal case. | |
155 | * | |
156 | * Architecture : | |
157 | * | |
158 | * At the heart of the design is a coroutine, NCR5380_main, | |
159 | * which is started from a workqueue for each NCR5380 host in the | |
160 | * system. It attempts to establish I_T_L or I_T_L_Q nexuses by | |
161 | * removing the commands from the issue queue and calling | |
162 | * NCR5380_select() if a nexus is not established. | |
163 | * | |
164 | * Once a nexus is established, the NCR5380_information_transfer() | |
165 | * phase goes through the various phases as instructed by the target. | |
166 | * if the target goes into MSG IN and sends a DISCONNECT message, | |
167 | * the command structure is placed into the per instance disconnected | |
168 | * queue, and NCR5380_main tries to find more work. If the target is | |
169 | * idle for too long, the system will try to sleep. | |
170 | * | |
171 | * If a command has disconnected, eventually an interrupt will trigger, | |
172 | * calling NCR5380_intr() which will in turn call NCR5380_reselect | |
173 | * to reestablish a nexus. This will run main if necessary. | |
174 | * | |
175 | * On command termination, the done function will be called as | |
176 | * appropriate. | |
177 | * | |
178 | * SCSI pointers are maintained in the SCp field of SCSI command | |
179 | * structures, being initialized after the command is connected | |
180 | * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. | |
181 | * Note that in violation of the standard, an implicit SAVE POINTERS operation | |
182 | * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. | |
183 | */ | |
184 | ||
185 | /* | |
186 | * Using this file : | |
187 | * This file a skeleton Linux SCSI driver for the NCR 5380 series | |
188 | * of chips. To use it, you write an architecture specific functions | |
189 | * and macros and include this file in your driver. | |
190 | * | |
191 | * These macros control options : | |
192 | * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be | |
193 | * defined. | |
194 | * | |
195 | * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically | |
196 | * for commands that return with a CHECK CONDITION status. | |
197 | * | |
198 | * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential | |
199 | * transceivers. | |
200 | * | |
201 | * DONT_USE_INTR - if defined, never use interrupts, even if we probe or | |
202 | * override-configure an IRQ. | |
203 | * | |
1da177e4 LT |
204 | * LINKED - if defined, linked commands are supported. |
205 | * | |
206 | * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases. | |
207 | * | |
208 | * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. | |
209 | * | |
210 | * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't | |
211 | * rely on phase mismatch and EOP interrupts to determine end | |
212 | * of phase. | |
213 | * | |
214 | * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You | |
215 | * only really want to use this if you're having a problem with | |
216 | * dropped characters during high speed communications, and even | |
217 | * then, you're going to be better off twiddling with transfersize | |
218 | * in the high level code. | |
219 | * | |
220 | * Defaults for these will be provided although the user may want to adjust | |
221 | * these to allocate CPU resources to the SCSI driver or "real" code. | |
222 | * | |
223 | * USLEEP_SLEEP - amount of time, in jiffies, to sleep | |
224 | * | |
225 | * USLEEP_POLL - amount of time, in jiffies, to poll | |
226 | * | |
227 | * These macros MUST be defined : | |
1da177e4 LT |
228 | * |
229 | * NCR5380_read(register) - read from the specified register | |
230 | * | |
231 | * NCR5380_write(register, value) - write to the specific register | |
232 | * | |
233 | * NCR5380_implementation_fields - additional fields needed for this | |
234 | * specific implementation of the NCR5380 | |
235 | * | |
236 | * Either real DMA *or* pseudo DMA may be implemented | |
237 | * REAL functions : | |
238 | * NCR5380_REAL_DMA should be defined if real DMA is to be used. | |
239 | * Note that the DMA setup functions should return the number of bytes | |
240 | * that they were able to program the controller for. | |
241 | * | |
242 | * Also note that generic i386/PC versions of these macros are | |
243 | * available as NCR5380_i386_dma_write_setup, | |
244 | * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. | |
245 | * | |
246 | * NCR5380_dma_write_setup(instance, src, count) - initialize | |
247 | * NCR5380_dma_read_setup(instance, dst, count) - initialize | |
248 | * NCR5380_dma_residual(instance); - residual count | |
249 | * | |
250 | * PSEUDO functions : | |
251 | * NCR5380_pwrite(instance, src, count) | |
252 | * NCR5380_pread(instance, dst, count); | |
253 | * | |
254 | * The generic driver is initialized by calling NCR5380_init(instance), | |
255 | * after setting the appropriate host specific fields and ID. If the | |
256 | * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, | |
257 | * possible) function may be used. | |
258 | */ | |
259 | ||
54d8fe44 FT |
260 | static int do_abort(struct Scsi_Host *); |
261 | static void do_reset(struct Scsi_Host *); | |
1da177e4 LT |
262 | |
263 | /* | |
264 | * initialize_SCp - init the scsi pointer field | |
265 | * @cmd: command block to set up | |
266 | * | |
267 | * Set up the internal fields in the SCSI command. | |
268 | */ | |
269 | ||
710ddd0d | 270 | static inline void initialize_SCp(struct scsi_cmnd *cmd) |
1da177e4 LT |
271 | { |
272 | /* | |
273 | * Initialize the Scsi Pointer field so that all of the commands in the | |
274 | * various queues are valid. | |
275 | */ | |
276 | ||
9e0fe44d BH |
277 | if (scsi_bufflen(cmd)) { |
278 | cmd->SCp.buffer = scsi_sglist(cmd); | |
279 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; | |
45711f1a | 280 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
1da177e4 LT |
281 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
282 | } else { | |
283 | cmd->SCp.buffer = NULL; | |
284 | cmd->SCp.buffers_residual = 0; | |
9e0fe44d BH |
285 | cmd->SCp.ptr = NULL; |
286 | cmd->SCp.this_residual = 0; | |
1da177e4 LT |
287 | } |
288 | } | |
289 | ||
290 | /** | |
2f854b82 FT |
291 | * NCR5380_poll_politely - wait for chip register value |
292 | * @instance: controller to poll | |
293 | * @reg: 5380 register to poll | |
294 | * @bit: Bitmask to check | |
295 | * @val: Value required to exit | |
296 | * @wait: Time-out in jiffies | |
297 | * | |
298 | * Polls the chip in a reasonably efficient manner waiting for an | |
299 | * event to occur. After a short quick poll we begin to yield the CPU | |
300 | * (if possible). In irq contexts the time-out is arbitrarily limited. | |
301 | * Callers may hold locks as long as they are held in irq mode. | |
302 | * | |
303 | * Returns 0 if event occurred otherwise -ETIMEDOUT. | |
1da177e4 | 304 | */ |
2f854b82 FT |
305 | |
306 | static int NCR5380_poll_politely(struct Scsi_Host *instance, | |
307 | int reg, int bit, int val, int wait) | |
1da177e4 | 308 | { |
2f854b82 FT |
309 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
310 | unsigned long deadline = jiffies + wait; | |
311 | unsigned long n; | |
312 | ||
313 | /* Busy-wait for up to 10 ms */ | |
314 | n = min(10000U, jiffies_to_usecs(wait)); | |
315 | n *= hostdata->accesses_per_ms; | |
316 | n /= 1000; | |
317 | do { | |
318 | if ((NCR5380_read(reg) & bit) == val) | |
1da177e4 LT |
319 | return 0; |
320 | cpu_relax(); | |
2f854b82 FT |
321 | } while (n--); |
322 | ||
323 | if (irqs_disabled() || in_interrupt()) | |
324 | return -ETIMEDOUT; | |
325 | ||
326 | /* Repeatedly sleep for 1 ms until deadline */ | |
327 | while (time_is_after_jiffies(deadline)) { | |
328 | schedule_timeout_uninterruptible(1); | |
329 | if ((NCR5380_read(reg) & bit) == val) | |
1da177e4 | 330 | return 0; |
1da177e4 | 331 | } |
2f854b82 | 332 | |
1da177e4 LT |
333 | return -ETIMEDOUT; |
334 | } | |
335 | ||
336 | static struct { | |
337 | unsigned char value; | |
338 | const char *name; | |
702809ce | 339 | } phases[] __maybe_unused = { |
1da177e4 LT |
340 | {PHASE_DATAOUT, "DATAOUT"}, |
341 | {PHASE_DATAIN, "DATAIN"}, | |
342 | {PHASE_CMDOUT, "CMDOUT"}, | |
343 | {PHASE_STATIN, "STATIN"}, | |
344 | {PHASE_MSGOUT, "MSGOUT"}, | |
345 | {PHASE_MSGIN, "MSGIN"}, | |
346 | {PHASE_UNKNOWN, "UNKNOWN"} | |
347 | }; | |
348 | ||
185a7a1c | 349 | #if NDEBUG |
1da177e4 LT |
350 | static struct { |
351 | unsigned char mask; | |
352 | const char *name; | |
353 | } signals[] = { | |
354 | {SR_DBP, "PARITY"}, | |
355 | {SR_RST, "RST"}, | |
356 | {SR_BSY, "BSY"}, | |
357 | {SR_REQ, "REQ"}, | |
358 | {SR_MSG, "MSG"}, | |
359 | {SR_CD, "CD"}, | |
360 | {SR_IO, "IO"}, | |
361 | {SR_SEL, "SEL"}, | |
362 | {0, NULL} | |
363 | }, | |
364 | basrs[] = { | |
365 | {BASR_ATN, "ATN"}, | |
366 | {BASR_ACK, "ACK"}, | |
367 | {0, NULL} | |
368 | }, | |
369 | icrs[] = { | |
370 | {ICR_ASSERT_RST, "ASSERT RST"}, | |
371 | {ICR_ASSERT_ACK, "ASSERT ACK"}, | |
372 | {ICR_ASSERT_BSY, "ASSERT BSY"}, | |
373 | {ICR_ASSERT_SEL, "ASSERT SEL"}, | |
374 | {ICR_ASSERT_ATN, "ASSERT ATN"}, | |
375 | {ICR_ASSERT_DATA, "ASSERT DATA"}, | |
376 | {0, NULL} | |
377 | }, | |
378 | mrs[] = { | |
379 | {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, | |
380 | {MR_TARGET, "MODE TARGET"}, | |
381 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, | |
382 | {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"}, | |
383 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, | |
384 | {MR_DMA_MODE, "MODE DMA"}, | |
385 | {MR_ARBITRATE, "MODE ARBITRATION"}, | |
386 | {0, NULL} | |
387 | }; | |
388 | ||
389 | /** | |
390 | * NCR5380_print - print scsi bus signals | |
391 | * @instance: adapter state to dump | |
392 | * | |
393 | * Print the SCSI bus signals for debugging purposes | |
394 | * | |
395 | * Locks: caller holds hostdata lock (not essential) | |
396 | */ | |
397 | ||
398 | static void NCR5380_print(struct Scsi_Host *instance) | |
399 | { | |
1da177e4 | 400 | unsigned char status, data, basr, mr, icr, i; |
1da177e4 LT |
401 | |
402 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
403 | status = NCR5380_read(STATUS_REG); | |
404 | mr = NCR5380_read(MODE_REG); | |
405 | icr = NCR5380_read(INITIATOR_COMMAND_REG); | |
406 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
407 | ||
408 | printk("STATUS_REG: %02x ", status); | |
409 | for (i = 0; signals[i].mask; ++i) | |
410 | if (status & signals[i].mask) | |
411 | printk(",%s", signals[i].name); | |
412 | printk("\nBASR: %02x ", basr); | |
413 | for (i = 0; basrs[i].mask; ++i) | |
414 | if (basr & basrs[i].mask) | |
415 | printk(",%s", basrs[i].name); | |
416 | printk("\nICR: %02x ", icr); | |
417 | for (i = 0; icrs[i].mask; ++i) | |
418 | if (icr & icrs[i].mask) | |
419 | printk(",%s", icrs[i].name); | |
420 | printk("\nMODE: %02x ", mr); | |
421 | for (i = 0; mrs[i].mask; ++i) | |
422 | if (mr & mrs[i].mask) | |
423 | printk(",%s", mrs[i].name); | |
424 | printk("\n"); | |
425 | } | |
426 | ||
427 | ||
428 | /* | |
429 | * NCR5380_print_phase - show SCSI phase | |
430 | * @instance: adapter to dump | |
431 | * | |
432 | * Print the current SCSI phase for debugging purposes | |
433 | * | |
434 | * Locks: none | |
435 | */ | |
436 | ||
437 | static void NCR5380_print_phase(struct Scsi_Host *instance) | |
438 | { | |
1da177e4 LT |
439 | unsigned char status; |
440 | int i; | |
1da177e4 LT |
441 | |
442 | status = NCR5380_read(STATUS_REG); | |
443 | if (!(status & SR_REQ)) | |
444 | printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no); | |
445 | else { | |
446 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i); | |
447 | printk("scsi%d : phase %s\n", instance->host_no, phases[i].name); | |
448 | } | |
449 | } | |
450 | #endif | |
451 | ||
452 | /* | |
453 | * These need tweaking, and would probably work best as per-device | |
454 | * flags initialized differently for disk, tape, cd, etc devices. | |
455 | * People with broken devices are free to experiment as to what gives | |
456 | * the best results for them. | |
457 | * | |
458 | * USLEEP_SLEEP should be a minimum seek time. | |
459 | * | |
460 | * USLEEP_POLL should be a maximum rotational latency. | |
461 | */ | |
462 | #ifndef USLEEP_SLEEP | |
463 | /* 20 ms (reasonable hard disk speed) */ | |
4e5a800c | 464 | #define USLEEP_SLEEP msecs_to_jiffies(20) |
1da177e4 LT |
465 | #endif |
466 | /* 300 RPM (floppy speed) */ | |
467 | #ifndef USLEEP_POLL | |
4e5a800c | 468 | #define USLEEP_POLL msecs_to_jiffies(200) |
1da177e4 | 469 | #endif |
1da177e4 LT |
470 | |
471 | /* | |
472 | * Function : int should_disconnect (unsigned char cmd) | |
473 | * | |
d6e05edc | 474 | * Purpose : decide whether a command would normally disconnect or |
1da177e4 LT |
475 | * not, since if it won't disconnect we should go to sleep. |
476 | * | |
477 | * Input : cmd - opcode of SCSI command | |
478 | * | |
479 | * Returns : DISCONNECT_LONG if we should disconnect for a really long | |
480 | * time (ie always, sleep, look for REQ active, sleep), | |
481 | * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal | |
482 | * time-to-data delay, DISCONNECT_NONE if this command would return | |
483 | * immediately. | |
484 | * | |
485 | * Future sleep algorithms based on time to data can exploit | |
486 | * something like this so they can differentiate between "normal" | |
487 | * (ie, read, write, seek) and unusual commands (ie, * format). | |
488 | * | |
489 | * Note : We don't deal with commands that handle an immediate disconnect, | |
490 | * | |
491 | */ | |
492 | ||
493 | static int should_disconnect(unsigned char cmd) | |
494 | { | |
495 | switch (cmd) { | |
496 | case READ_6: | |
497 | case WRITE_6: | |
498 | case SEEK_6: | |
499 | case READ_10: | |
500 | case WRITE_10: | |
501 | case SEEK_10: | |
502 | return DISCONNECT_TIME_TO_DATA; | |
503 | case FORMAT_UNIT: | |
504 | case SEARCH_HIGH: | |
505 | case SEARCH_LOW: | |
506 | case SEARCH_EQUAL: | |
507 | return DISCONNECT_LONG; | |
508 | default: | |
509 | return DISCONNECT_NONE; | |
510 | } | |
511 | } | |
512 | ||
513 | static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout) | |
514 | { | |
515 | hostdata->time_expires = jiffies + timeout; | |
0ad0eff9 | 516 | queue_delayed_work(hostdata->work_q, &hostdata->coroutine, timeout); |
1da177e4 LT |
517 | } |
518 | ||
519 | ||
d5f7e65d | 520 | static int probe_irq __initdata; |
1da177e4 LT |
521 | |
522 | /** | |
523 | * probe_intr - helper for IRQ autoprobe | |
524 | * @irq: interrupt number | |
525 | * @dev_id: unused | |
526 | * @regs: unused | |
527 | * | |
528 | * Set a flag to indicate the IRQ in question was received. This is | |
529 | * used by the IRQ probe code. | |
530 | */ | |
531 | ||
7d12e780 | 532 | static irqreturn_t __init probe_intr(int irq, void *dev_id) |
1da177e4 LT |
533 | { |
534 | probe_irq = irq; | |
535 | return IRQ_HANDLED; | |
536 | } | |
537 | ||
538 | /** | |
539 | * NCR5380_probe_irq - find the IRQ of an NCR5380 | |
540 | * @instance: NCR5380 controller | |
541 | * @possible: bitmask of ISA IRQ lines | |
542 | * | |
543 | * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ | |
544 | * and then looking to see what interrupt actually turned up. | |
545 | * | |
546 | * Locks: none, irqs must be enabled on entry | |
547 | */ | |
548 | ||
702809ce AM |
549 | static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance, |
550 | int possible) | |
1da177e4 | 551 | { |
1da177e4 LT |
552 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
553 | unsigned long timeout; | |
554 | int trying_irqs, i, mask; | |
1da177e4 | 555 | |
22f5f10d | 556 | for (trying_irqs = 0, i = 1, mask = 2; i < 16; ++i, mask <<= 1) |
4909cc2b | 557 | if ((mask & possible) && (request_irq(i, &probe_intr, 0, "NCR-probe", NULL) == 0)) |
1da177e4 LT |
558 | trying_irqs |= mask; |
559 | ||
4e5a800c | 560 | timeout = jiffies + msecs_to_jiffies(250); |
22f5f10d | 561 | probe_irq = NO_IRQ; |
1da177e4 LT |
562 | |
563 | /* | |
564 | * A interrupt is triggered whenever BSY = false, SEL = true | |
565 | * and a bit set in the SELECT_ENABLE_REG is asserted on the | |
566 | * SCSI bus. | |
567 | * | |
568 | * Note that the bus is only driven when the phase control signals | |
569 | * (I/O, C/D, and MSG) match those in the TCR, so we must reset that | |
570 | * to zero. | |
571 | */ | |
572 | ||
573 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
574 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
575 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); | |
576 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL); | |
577 | ||
22f5f10d | 578 | while (probe_irq == NO_IRQ && time_before(jiffies, timeout)) |
a9a3047d | 579 | schedule_timeout_uninterruptible(1); |
1da177e4 LT |
580 | |
581 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
582 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
583 | ||
22f5f10d | 584 | for (i = 1, mask = 2; i < 16; ++i, mask <<= 1) |
1da177e4 LT |
585 | if (trying_irqs & mask) |
586 | free_irq(i, NULL); | |
587 | ||
588 | return probe_irq; | |
589 | } | |
590 | ||
591 | /** | |
8c32513b FT |
592 | * NCR58380_info - report driver and host information |
593 | * @instance: relevant scsi host instance | |
1da177e4 | 594 | * |
8c32513b | 595 | * For use as the host template info() handler. |
1da177e4 LT |
596 | * |
597 | * Locks: none | |
598 | */ | |
599 | ||
8c32513b | 600 | static const char *NCR5380_info(struct Scsi_Host *instance) |
1da177e4 | 601 | { |
8c32513b FT |
602 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
603 | ||
604 | return hostdata->info; | |
605 | } | |
606 | ||
607 | static void prepare_info(struct Scsi_Host *instance) | |
608 | { | |
609 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
610 | ||
611 | snprintf(hostdata->info, sizeof(hostdata->info), | |
612 | "%s, io_port 0x%lx, n_io_port %d, " | |
613 | "base 0x%lx, irq %d, " | |
614 | "can_queue %d, cmd_per_lun %d, " | |
615 | "sg_tablesize %d, this_id %d, " | |
9c3f0e2b | 616 | "flags { %s%s%s%s}, " |
4d029e9a FT |
617 | #if defined(USLEEP_POLL) && defined(USLEEP_SLEEP) |
618 | "USLEEP_POLL %lu, USLEEP_SLEEP %lu, " | |
8c32513b FT |
619 | #endif |
620 | "options { %s} ", | |
621 | instance->hostt->name, instance->io_port, instance->n_io_port, | |
622 | instance->base, instance->irq, | |
623 | instance->can_queue, instance->cmd_per_lun, | |
624 | instance->sg_tablesize, instance->this_id, | |
625 | hostdata->flags & FLAG_NCR53C400 ? "NCR53C400 " : "", | |
626 | hostdata->flags & FLAG_DTC3181E ? "DTC3181E " : "", | |
627 | hostdata->flags & FLAG_NO_PSEUDO_DMA ? "NO_PSEUDO_DMA " : "", | |
9c3f0e2b | 628 | hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "", |
4d029e9a FT |
629 | #if defined(USLEEP_POLL) && defined(USLEEP_SLEEP) |
630 | USLEEP_POLL, USLEEP_SLEEP, | |
8c32513b | 631 | #endif |
1da177e4 | 632 | #ifdef AUTOPROBE_IRQ |
8c32513b | 633 | "AUTOPROBE_IRQ " |
1da177e4 | 634 | #endif |
1da177e4 | 635 | #ifdef DIFFERENTIAL |
8c32513b | 636 | "DIFFERENTIAL " |
1da177e4 LT |
637 | #endif |
638 | #ifdef REAL_DMA | |
8c32513b | 639 | "REAL_DMA " |
1da177e4 LT |
640 | #endif |
641 | #ifdef REAL_DMA_POLL | |
8c32513b | 642 | "REAL_DMA_POLL " |
1da177e4 LT |
643 | #endif |
644 | #ifdef PARITY | |
8c32513b | 645 | "PARITY " |
1da177e4 LT |
646 | #endif |
647 | #ifdef PSEUDO_DMA | |
8c32513b | 648 | "PSEUDO_DMA " |
1da177e4 LT |
649 | #endif |
650 | #ifdef UNSAFE | |
8c32513b | 651 | "UNSAFE " |
8c32513b FT |
652 | #endif |
653 | ""); | |
1da177e4 LT |
654 | } |
655 | ||
656 | /** | |
657 | * NCR5380_print_status - dump controller info | |
658 | * @instance: controller to dump | |
659 | * | |
660 | * Print commands in the various queues, called from NCR5380_abort | |
661 | * and NCR5380_debug to aid debugging. | |
662 | * | |
663 | * Locks: called functions disable irqs | |
664 | */ | |
665 | ||
3be1b3ea | 666 | static void __maybe_unused NCR5380_print_status(struct Scsi_Host *instance) |
1da177e4 LT |
667 | { |
668 | NCR5380_dprint(NDEBUG_ANY, instance); | |
669 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
670 | } | |
671 | ||
a9c2dc43 | 672 | #ifdef PSEUDO_DMA |
1da177e4 LT |
673 | /******************************************/ |
674 | /* | |
675 | * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED] | |
676 | * | |
677 | * *buffer: I/O buffer | |
678 | * **start: if inout == FALSE pointer into buffer where user read should start | |
679 | * offset: current offset | |
680 | * length: length of buffer | |
681 | * hostno: Scsi_Host host_no | |
682 | * inout: TRUE - user is writing; FALSE - user is reading | |
683 | * | |
684 | * Return the number of bytes read from or written | |
685 | */ | |
686 | ||
dd7ab71b AV |
687 | static int __maybe_unused NCR5380_write_info(struct Scsi_Host *instance, |
688 | char *buffer, int length) | |
689 | { | |
a9c2dc43 FT |
690 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
691 | ||
692 | hostdata->spin_max_r = 0; | |
693 | hostdata->spin_max_w = 0; | |
694 | return 0; | |
dd7ab71b | 695 | } |
a9c2dc43 | 696 | #endif |
dd7ab71b | 697 | |
1da177e4 | 698 | static |
710ddd0d | 699 | void lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, struct seq_file *m); |
1da177e4 | 700 | static |
dd7ab71b | 701 | void lprint_command(unsigned char *cmd, struct seq_file *m); |
1da177e4 | 702 | static |
dd7ab71b | 703 | void lprint_opcode(int opcode, struct seq_file *m); |
1da177e4 | 704 | |
dd7ab71b AV |
705 | static int __maybe_unused NCR5380_show_info(struct seq_file *m, |
706 | struct Scsi_Host *instance) | |
1da177e4 | 707 | { |
1da177e4 | 708 | struct NCR5380_hostdata *hostdata; |
710ddd0d | 709 | struct scsi_cmnd *ptr; |
1da177e4 LT |
710 | |
711 | hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
712 | ||
a9c2dc43 | 713 | #ifdef PSEUDO_DMA |
0c3de38f | 714 | seq_printf(m, "Highwater I/O busy spin counts: write %d, read %d\n", |
a9c2dc43 | 715 | hostdata->spin_max_w, hostdata->spin_max_r); |
1da177e4 LT |
716 | #endif |
717 | spin_lock_irq(instance->host_lock); | |
718 | if (!hostdata->connected) | |
0c3de38f | 719 | seq_printf(m, "scsi%d: no currently connected command\n", instance->host_no); |
1da177e4 | 720 | else |
710ddd0d | 721 | lprint_Scsi_Cmnd((struct scsi_cmnd *) hostdata->connected, m); |
0c3de38f | 722 | seq_printf(m, "scsi%d: issue_queue\n", instance->host_no); |
710ddd0d | 723 | for (ptr = (struct scsi_cmnd *) hostdata->issue_queue; ptr; ptr = (struct scsi_cmnd *) ptr->host_scribble) |
dd7ab71b | 724 | lprint_Scsi_Cmnd(ptr, m); |
1da177e4 | 725 | |
0c3de38f | 726 | seq_printf(m, "scsi%d: disconnected_queue\n", instance->host_no); |
710ddd0d | 727 | for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr; ptr = (struct scsi_cmnd *) ptr->host_scribble) |
dd7ab71b | 728 | lprint_Scsi_Cmnd(ptr, m); |
1da177e4 | 729 | spin_unlock_irq(instance->host_lock); |
dd7ab71b | 730 | return 0; |
1da177e4 LT |
731 | } |
732 | ||
710ddd0d | 733 | static void lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, struct seq_file *m) |
1da177e4 | 734 | { |
0c3de38f | 735 | seq_printf(m, "scsi%d : destination target %d, lun %llu\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun); |
91c40f24 | 736 | seq_puts(m, " command = "); |
dd7ab71b | 737 | lprint_command(cmd->cmnd, m); |
1da177e4 LT |
738 | } |
739 | ||
dd7ab71b | 740 | static void lprint_command(unsigned char *command, struct seq_file *m) |
1da177e4 LT |
741 | { |
742 | int i, s; | |
dd7ab71b | 743 | lprint_opcode(command[0], m); |
1da177e4 | 744 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) |
0c3de38f | 745 | seq_printf(m, "%02x ", command[i]); |
f50332ff | 746 | seq_putc(m, '\n'); |
1da177e4 LT |
747 | } |
748 | ||
dd7ab71b | 749 | static void lprint_opcode(int opcode, struct seq_file *m) |
1da177e4 | 750 | { |
0c3de38f | 751 | seq_printf(m, "%2d (0x%02x)", opcode, opcode); |
1da177e4 LT |
752 | } |
753 | ||
754 | ||
755 | /** | |
756 | * NCR5380_init - initialise an NCR5380 | |
757 | * @instance: adapter to configure | |
758 | * @flags: control flags | |
759 | * | |
760 | * Initializes *instance and corresponding 5380 chip, | |
761 | * with flags OR'd into the initial flags value. | |
762 | * | |
763 | * Notes : I assume that the host, hostno, and id bits have been | |
764 | * set correctly. I don't care about the irq and other fields. | |
765 | * | |
766 | * Returns 0 for success | |
767 | * | |
768 | * Locks: interrupts must be enabled when we are called | |
769 | */ | |
770 | ||
6f039790 | 771 | static int NCR5380_init(struct Scsi_Host *instance, int flags) |
1da177e4 | 772 | { |
b6488f97 | 773 | int i; |
1da177e4 | 774 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
2f854b82 | 775 | unsigned long deadline; |
1da177e4 LT |
776 | |
777 | if(in_interrupt()) | |
778 | printk(KERN_ERR "NCR5380_init called with interrupts off!\n"); | |
1da177e4 | 779 | |
1da177e4 LT |
780 | hostdata->id_mask = 1 << instance->this_id; |
781 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) | |
782 | if (i > hostdata->id_mask) | |
783 | hostdata->id_higher_mask |= i; | |
784 | for (i = 0; i < 8; ++i) | |
785 | hostdata->busy[i] = 0; | |
786 | #ifdef REAL_DMA | |
787 | hostdata->dmalen = 0; | |
788 | #endif | |
1da177e4 LT |
789 | hostdata->connected = NULL; |
790 | hostdata->issue_queue = NULL; | |
791 | hostdata->disconnected_queue = NULL; | |
792 | ||
c4028958 | 793 | INIT_DELAYED_WORK(&hostdata->coroutine, NCR5380_main); |
0ad0eff9 FT |
794 | hostdata->work_q = alloc_workqueue("ncr5380_%d", |
795 | WQ_UNBOUND | WQ_MEM_RECLAIM, | |
796 | 1, instance->host_no); | |
797 | if (!hostdata->work_q) | |
798 | return -ENOMEM; | |
799 | ||
1da177e4 LT |
800 | /* The CHECK code seems to break the 53C400. Will check it later maybe */ |
801 | if (flags & FLAG_NCR53C400) | |
802 | hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags; | |
803 | else | |
804 | hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags; | |
805 | ||
806 | hostdata->host = instance; | |
807 | hostdata->time_expires = 0; | |
808 | ||
8c32513b FT |
809 | prepare_info(instance); |
810 | ||
1da177e4 LT |
811 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
812 | NCR5380_write(MODE_REG, MR_BASE); | |
813 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
814 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
2f854b82 FT |
815 | |
816 | /* Calibrate register polling loop */ | |
817 | i = 0; | |
818 | deadline = jiffies + 1; | |
819 | do { | |
820 | cpu_relax(); | |
821 | } while (time_is_after_jiffies(deadline)); | |
822 | deadline += msecs_to_jiffies(256); | |
823 | do { | |
824 | NCR5380_read(STATUS_REG); | |
825 | ++i; | |
826 | cpu_relax(); | |
827 | } while (time_is_after_jiffies(deadline)); | |
828 | hostdata->accesses_per_ms = i / 256; | |
829 | ||
b6488f97 FT |
830 | return 0; |
831 | } | |
1da177e4 | 832 | |
b6488f97 FT |
833 | /** |
834 | * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems. | |
835 | * @instance: adapter to check | |
836 | * | |
837 | * If the system crashed, it may have crashed with a connected target and | |
838 | * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the | |
839 | * currently established nexus, which we know nothing about. Failing that | |
840 | * do a bus reset. | |
841 | * | |
842 | * Note that a bus reset will cause the chip to assert IRQ. | |
843 | * | |
844 | * Returns 0 if successful, otherwise -ENXIO. | |
845 | */ | |
846 | ||
847 | static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance) | |
848 | { | |
9c3f0e2b | 849 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
b6488f97 | 850 | int pass; |
1da177e4 LT |
851 | |
852 | for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { | |
853 | switch (pass) { | |
854 | case 1: | |
855 | case 3: | |
856 | case 5: | |
636b1ec8 FT |
857 | shost_printk(KERN_ERR, instance, "SCSI bus busy, waiting up to five seconds\n"); |
858 | NCR5380_poll_politely(instance, | |
859 | STATUS_REG, SR_BSY, 0, 5 * HZ); | |
1da177e4 LT |
860 | break; |
861 | case 2: | |
636b1ec8 | 862 | shost_printk(KERN_ERR, instance, "bus busy, attempting abort\n"); |
1da177e4 LT |
863 | do_abort(instance); |
864 | break; | |
865 | case 4: | |
636b1ec8 | 866 | shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n"); |
1da177e4 | 867 | do_reset(instance); |
9c3f0e2b FT |
868 | /* Wait after a reset; the SCSI standard calls for |
869 | * 250ms, we wait 500ms to be on the safe side. | |
870 | * But some Toshiba CD-ROMs need ten times that. | |
871 | */ | |
872 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) | |
873 | msleep(2500); | |
874 | else | |
875 | msleep(500); | |
1da177e4 LT |
876 | break; |
877 | case 6: | |
636b1ec8 | 878 | shost_printk(KERN_ERR, instance, "bus locked solid\n"); |
1da177e4 LT |
879 | return -ENXIO; |
880 | } | |
881 | } | |
882 | return 0; | |
883 | } | |
884 | ||
885 | /** | |
886 | * NCR5380_exit - remove an NCR5380 | |
887 | * @instance: adapter to remove | |
888 | */ | |
889 | ||
a43cf0f3 | 890 | static void NCR5380_exit(struct Scsi_Host *instance) |
1da177e4 LT |
891 | { |
892 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
893 | ||
a684b8da | 894 | cancel_delayed_work_sync(&hostdata->coroutine); |
0ad0eff9 | 895 | destroy_workqueue(hostdata->work_q); |
1da177e4 LT |
896 | } |
897 | ||
898 | /** | |
899 | * NCR5380_queue_command - queue a command | |
900 | * @cmd: SCSI command | |
901 | * @done: completion handler | |
902 | * | |
903 | * cmd is added to the per instance issue_queue, with minor | |
904 | * twiddling done to the host specific fields of cmd. If the | |
905 | * main coroutine is not running, it is restarted. | |
906 | * | |
907 | * Locks: host lock taken by caller | |
908 | */ | |
909 | ||
710ddd0d | 910 | static int NCR5380_queue_command_lck(struct scsi_cmnd *cmd, void (*done) (struct scsi_cmnd *)) |
1da177e4 LT |
911 | { |
912 | struct Scsi_Host *instance = cmd->device->host; | |
913 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
710ddd0d | 914 | struct scsi_cmnd *tmp; |
1da177e4 LT |
915 | |
916 | #if (NDEBUG & NDEBUG_NO_WRITE) | |
917 | switch (cmd->cmnd[0]) { | |
918 | case WRITE_6: | |
919 | case WRITE_10: | |
920 | printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no); | |
921 | cmd->result = (DID_ERROR << 16); | |
922 | done(cmd); | |
923 | return 0; | |
924 | } | |
925 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ | |
926 | ||
1da177e4 LT |
927 | /* |
928 | * We use the host_scribble field as a pointer to the next command | |
929 | * in a queue | |
930 | */ | |
931 | ||
932 | cmd->host_scribble = NULL; | |
933 | cmd->scsi_done = done; | |
934 | cmd->result = 0; | |
935 | ||
936 | /* | |
937 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
938 | * commands are added to the head of the queue since any command will | |
939 | * clear the contingent allegiance condition that exists and the | |
940 | * sense data is only guaranteed to be valid while the condition exists. | |
941 | */ | |
942 | ||
943 | if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { | |
944 | LIST(cmd, hostdata->issue_queue); | |
945 | cmd->host_scribble = (unsigned char *) hostdata->issue_queue; | |
946 | hostdata->issue_queue = cmd; | |
947 | } else { | |
710ddd0d | 948 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (struct scsi_cmnd *) tmp->host_scribble); |
1da177e4 LT |
949 | LIST(cmd, tmp); |
950 | tmp->host_scribble = (unsigned char *) cmd; | |
951 | } | |
52a6a1cb | 952 | dprintk(NDEBUG_QUEUES, "scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); |
1da177e4 LT |
953 | |
954 | /* Run the coroutine if it isn't already running. */ | |
955 | /* Kick off command processing */ | |
0ad0eff9 | 956 | queue_delayed_work(hostdata->work_q, &hostdata->coroutine, 0); |
1da177e4 LT |
957 | return 0; |
958 | } | |
959 | ||
f281233d | 960 | static DEF_SCSI_QCMD(NCR5380_queue_command) |
1da177e4 LT |
961 | |
962 | /** | |
963 | * NCR5380_main - NCR state machines | |
964 | * | |
965 | * NCR5380_main is a coroutine that runs as long as more work can | |
966 | * be done on the NCR5380 host adapters in a system. Both | |
967 | * NCR5380_queue_command() and NCR5380_intr() will try to start it | |
968 | * in case it is not running. | |
969 | * | |
970 | * Locks: called as its own thread with no locks held. Takes the | |
971 | * host lock and called routines may take the isa dma lock. | |
972 | */ | |
973 | ||
c4028958 | 974 | static void NCR5380_main(struct work_struct *work) |
1da177e4 | 975 | { |
c4028958 DH |
976 | struct NCR5380_hostdata *hostdata = |
977 | container_of(work, struct NCR5380_hostdata, coroutine.work); | |
1da177e4 | 978 | struct Scsi_Host *instance = hostdata->host; |
710ddd0d | 979 | struct scsi_cmnd *tmp, *prev; |
1da177e4 LT |
980 | int done; |
981 | ||
982 | spin_lock_irq(instance->host_lock); | |
983 | do { | |
984 | /* Lock held here */ | |
985 | done = 1; | |
ae753a33 | 986 | if (!hostdata->connected) { |
52a6a1cb | 987 | dprintk(NDEBUG_MAIN, "scsi%d : not connected\n", instance->host_no); |
1da177e4 LT |
988 | /* |
989 | * Search through the issue_queue for a command destined | |
990 | * for a target that's not busy. | |
991 | */ | |
710ddd0d | 992 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (struct scsi_cmnd *) tmp->host_scribble) |
1da177e4 LT |
993 | { |
994 | if (prev != tmp) | |
9cb78c16 | 995 | dprintk(NDEBUG_LISTS, "MAIN tmp=%p target=%d busy=%d lun=%llu\n", tmp, tmp->device->id, hostdata->busy[tmp->device->id], tmp->device->lun); |
1da177e4 | 996 | /* When we find one, remove it from the issue queue. */ |
9cb78c16 HR |
997 | if (!(hostdata->busy[tmp->device->id] & |
998 | (1 << (u8)(tmp->device->lun & 0xff)))) { | |
1da177e4 LT |
999 | if (prev) { |
1000 | REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); | |
1001 | prev->host_scribble = tmp->host_scribble; | |
1002 | } else { | |
1003 | REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble); | |
710ddd0d | 1004 | hostdata->issue_queue = (struct scsi_cmnd *) tmp->host_scribble; |
1da177e4 LT |
1005 | } |
1006 | tmp->host_scribble = NULL; | |
1007 | ||
1008 | /* | |
1009 | * Attempt to establish an I_T_L nexus here. | |
1010 | * On success, instance->hostdata->connected is set. | |
1011 | * On failure, we must add the command back to the | |
1012 | * issue queue so we can keep trying. | |
1013 | */ | |
9cb78c16 | 1014 | dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, "scsi%d : main() : command for target %d lun %llu removed from issue_queue\n", instance->host_no, tmp->device->id, tmp->device->lun); |
1da177e4 | 1015 | |
76f13b93 FT |
1016 | /* |
1017 | * REQUEST SENSE commands are issued without tagged | |
1018 | * queueing, even on SCSI-II devices because the | |
1019 | * contingent allegiance condition exists for the | |
1020 | * entire unit. | |
1021 | */ | |
1022 | ||
1023 | if (!NCR5380_select(instance, tmp)) { | |
1f1b0c74 | 1024 | /* OK or bad target */ |
1da177e4 | 1025 | } else { |
1f1b0c74 | 1026 | /* Need to retry */ |
1da177e4 LT |
1027 | LIST(tmp, hostdata->issue_queue); |
1028 | tmp->host_scribble = (unsigned char *) hostdata->issue_queue; | |
1029 | hostdata->issue_queue = tmp; | |
1030 | done = 0; | |
52a6a1cb | 1031 | dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, "scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no); |
1da177e4 | 1032 | } |
ae753a33 | 1033 | if (hostdata->connected) |
1f1b0c74 | 1034 | break; |
1da177e4 LT |
1035 | /* lock held here still */ |
1036 | } /* if target/lun is not busy */ | |
1037 | } /* for */ | |
1038 | /* exited locked */ | |
1039 | } /* if (!hostdata->connected) */ | |
1da177e4 LT |
1040 | if (hostdata->connected |
1041 | #ifdef REAL_DMA | |
1042 | && !hostdata->dmalen | |
1043 | #endif | |
1044 | && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies)) | |
1045 | ) { | |
52a6a1cb | 1046 | dprintk(NDEBUG_MAIN, "scsi%d : main() : performing information transfer\n", instance->host_no); |
1da177e4 | 1047 | NCR5380_information_transfer(instance); |
52a6a1cb | 1048 | dprintk(NDEBUG_MAIN, "scsi%d : main() : done set false\n", instance->host_no); |
1da177e4 | 1049 | done = 0; |
1d3db59d | 1050 | } |
1da177e4 LT |
1051 | } while (!done); |
1052 | ||
1053 | spin_unlock_irq(instance->host_lock); | |
1054 | } | |
1055 | ||
1056 | #ifndef DONT_USE_INTR | |
1057 | ||
1058 | /** | |
1059 | * NCR5380_intr - generic NCR5380 irq handler | |
1060 | * @irq: interrupt number | |
1061 | * @dev_id: device info | |
1da177e4 LT |
1062 | * |
1063 | * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses | |
1064 | * from the disconnected queue, and restarting NCR5380_main() | |
1065 | * as required. | |
1066 | * | |
1067 | * Locks: takes the needed instance locks | |
1068 | */ | |
1069 | ||
baa9aac6 | 1070 | static irqreturn_t NCR5380_intr(int dummy, void *dev_id) |
1da177e4 | 1071 | { |
baa9aac6 | 1072 | struct Scsi_Host *instance = dev_id; |
1da177e4 LT |
1073 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
1074 | int done; | |
1075 | unsigned char basr; | |
1076 | unsigned long flags; | |
1077 | ||
52a6a1cb FT |
1078 | dprintk(NDEBUG_INTR, "scsi : NCR5380 irq %d triggered\n", |
1079 | instance->irq); | |
1da177e4 LT |
1080 | |
1081 | do { | |
1082 | done = 1; | |
1083 | spin_lock_irqsave(instance->host_lock, flags); | |
1084 | /* Look for pending interrupts */ | |
1da177e4 LT |
1085 | basr = NCR5380_read(BUS_AND_STATUS_REG); |
1086 | /* XXX dispatch to appropriate routine if found and done=0 */ | |
1087 | if (basr & BASR_IRQ) { | |
1088 | NCR5380_dprint(NDEBUG_INTR, instance); | |
1089 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { | |
1090 | done = 0; | |
52a6a1cb | 1091 | dprintk(NDEBUG_INTR, "scsi%d : SEL interrupt\n", instance->host_no); |
1da177e4 LT |
1092 | NCR5380_reselect(instance); |
1093 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1094 | } else if (basr & BASR_PARITY_ERROR) { | |
52a6a1cb | 1095 | dprintk(NDEBUG_INTR, "scsi%d : PARITY interrupt\n", instance->host_no); |
1da177e4 LT |
1096 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1097 | } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { | |
52a6a1cb | 1098 | dprintk(NDEBUG_INTR, "scsi%d : RESET interrupt\n", instance->host_no); |
1da177e4 LT |
1099 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1100 | } else { | |
1101 | #if defined(REAL_DMA) | |
1102 | /* | |
1103 | * We should only get PHASE MISMATCH and EOP interrupts | |
1104 | * if we have DMA enabled, so do a sanity check based on | |
1105 | * the current setting of the MODE register. | |
1106 | */ | |
1107 | ||
1108 | if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) { | |
25985edc | 1109 | int transferred; |
1da177e4 LT |
1110 | |
1111 | if (!hostdata->connected) | |
1112 | panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno); | |
1113 | ||
25985edc | 1114 | transferred = (hostdata->dmalen - NCR5380_dma_residual(instance)); |
1da177e4 LT |
1115 | hostdata->connected->SCp.this_residual -= transferred; |
1116 | hostdata->connected->SCp.ptr += transferred; | |
1117 | hostdata->dmalen = 0; | |
1118 | ||
1119 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1120 | ||
1121 | /* FIXME: we need to poll briefly then defer a workqueue task ! */ | |
1122 | NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ); | |
1123 | ||
1124 | NCR5380_write(MODE_REG, MR_BASE); | |
1125 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1126 | } | |
1127 | #else | |
52a6a1cb | 1128 | 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)); |
1da177e4 LT |
1129 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1130 | #endif | |
1131 | } | |
1132 | } /* if BASR_IRQ */ | |
1133 | spin_unlock_irqrestore(instance->host_lock, flags); | |
1134 | if(!done) | |
0ad0eff9 FT |
1135 | queue_delayed_work(hostdata->work_q, |
1136 | &hostdata->coroutine, 0); | |
1da177e4 LT |
1137 | } while (!done); |
1138 | return IRQ_HANDLED; | |
1139 | } | |
1140 | ||
1141 | #endif | |
1142 | ||
1da177e4 | 1143 | /* |
710ddd0d FT |
1144 | * Function : int NCR5380_select(struct Scsi_Host *instance, |
1145 | * struct scsi_cmnd *cmd) | |
1da177e4 LT |
1146 | * |
1147 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, | |
1148 | * including ARBITRATION, SELECTION, and initial message out for | |
1149 | * IDENTIFY and queue messages. | |
1150 | * | |
1151 | * Inputs : instance - instantiation of the 5380 driver on which this | |
76f13b93 | 1152 | * target lives, cmd - SCSI command to execute. |
1da177e4 | 1153 | * |
6323876f FT |
1154 | * Returns : -1 if selection failed but should be retried. |
1155 | * 0 if selection failed and should not be retried. | |
1156 | * 0 if selection succeeded completely (hostdata->connected == cmd). | |
1da177e4 LT |
1157 | * |
1158 | * Side effects : | |
1159 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit | |
1160 | * with registers as they should have been on entry - ie | |
1161 | * SELECT_ENABLE will be set appropriately, the NCR5380 | |
1162 | * will cease to drive any SCSI bus signals. | |
1163 | * | |
1164 | * If successful : I_T_L or I_T_L_Q nexus will be established, | |
1165 | * instance->connected will be set to cmd. | |
1166 | * SELECT interrupt will be disabled. | |
1167 | * | |
1168 | * If failed (no target) : cmd->scsi_done() will be called, and the | |
1169 | * cmd->result host byte set to DID_BAD_TARGET. | |
1170 | * | |
1171 | * Locks: caller holds hostdata lock in IRQ mode | |
1172 | */ | |
1173 | ||
710ddd0d | 1174 | static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd) |
1da177e4 | 1175 | { |
1da177e4 LT |
1176 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
1177 | unsigned char tmp[3], phase; | |
1178 | unsigned char *data; | |
1179 | int len; | |
1da177e4 | 1180 | int err; |
1da177e4 | 1181 | |
1da177e4 | 1182 | NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
52a6a1cb | 1183 | dprintk(NDEBUG_ARBITRATION, "scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id); |
1da177e4 LT |
1184 | |
1185 | /* | |
1186 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the | |
1187 | * data bus during SELECTION. | |
1188 | */ | |
1189 | ||
1190 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
1191 | ||
1192 | /* | |
1193 | * Start arbitration. | |
1194 | */ | |
1195 | ||
1196 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); | |
1197 | NCR5380_write(MODE_REG, MR_ARBITRATE); | |
1198 | ||
1199 | ||
1200 | /* We can be relaxed here, interrupts are on, we are | |
1201 | in workqueue context, the birds are singing in the trees */ | |
1202 | spin_unlock_irq(instance->host_lock); | |
1203 | err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ); | |
1204 | spin_lock_irq(instance->host_lock); | |
1205 | if (err < 0) { | |
1206 | printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__); | |
1207 | NCR5380_write(MODE_REG, MR_BASE); | |
1208 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
6323876f | 1209 | return -1; |
1da177e4 LT |
1210 | } |
1211 | ||
52a6a1cb | 1212 | dprintk(NDEBUG_ARBITRATION, "scsi%d : arbitration complete\n", instance->host_no); |
1da177e4 LT |
1213 | |
1214 | /* | |
1215 | * The arbitration delay is 2.2us, but this is a minimum and there is | |
1216 | * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate | |
1217 | * the integral nature of udelay(). | |
1218 | * | |
1219 | */ | |
1220 | ||
1221 | udelay(3); | |
1222 | ||
1223 | /* Check for lost arbitration */ | |
1224 | 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)) { | |
1225 | NCR5380_write(MODE_REG, MR_BASE); | |
52a6a1cb | 1226 | dprintk(NDEBUG_ARBITRATION, "scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no); |
6323876f | 1227 | return -1; |
1da177e4 | 1228 | } |
cf13b083 FT |
1229 | |
1230 | /* After/during arbitration, BSY should be asserted. | |
1231 | * IBM DPES-31080 Version S31Q works now | |
1232 | * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) | |
1233 | */ | |
1234 | NCR5380_write(INITIATOR_COMMAND_REG, | |
1235 | ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY); | |
1da177e4 LT |
1236 | |
1237 | if (!(hostdata->flags & FLAG_DTC3181E) && | |
1238 | /* RvC: DTC3181E has some trouble with this | |
1239 | * so we simply removed it. Seems to work with | |
1240 | * only Mustek scanner attached | |
1241 | */ | |
1242 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { | |
1243 | NCR5380_write(MODE_REG, MR_BASE); | |
1244 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
52a6a1cb | 1245 | dprintk(NDEBUG_ARBITRATION, "scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no); |
6323876f | 1246 | return -1; |
1da177e4 LT |
1247 | } |
1248 | /* | |
1249 | * Again, bus clear + bus settle time is 1.2us, however, this is | |
1250 | * a minimum so we'll udelay ceil(1.2) | |
1251 | */ | |
1252 | ||
9c3f0e2b FT |
1253 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) |
1254 | udelay(15); | |
1255 | else | |
1256 | udelay(2); | |
1da177e4 | 1257 | |
52a6a1cb | 1258 | dprintk(NDEBUG_ARBITRATION, "scsi%d : won arbitration\n", instance->host_no); |
1da177e4 LT |
1259 | |
1260 | /* | |
1261 | * Now that we have won arbitration, start Selection process, asserting | |
1262 | * the host and target ID's on the SCSI bus. | |
1263 | */ | |
1264 | ||
422c0d61 | 1265 | NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd)))); |
1da177e4 LT |
1266 | |
1267 | /* | |
1268 | * Raise ATN while SEL is true before BSY goes false from arbitration, | |
1269 | * since this is the only way to guarantee that we'll get a MESSAGE OUT | |
1270 | * phase immediately after selection. | |
1271 | */ | |
1272 | ||
1273 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); | |
1274 | NCR5380_write(MODE_REG, MR_BASE); | |
1275 | ||
1276 | /* | |
1277 | * Reselect interrupts must be turned off prior to the dropping of BSY, | |
1278 | * otherwise we will trigger an interrupt. | |
1279 | */ | |
1280 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1281 | ||
1282 | /* | |
1283 | * The initiator shall then wait at least two deskew delays and release | |
1284 | * the BSY signal. | |
1285 | */ | |
1286 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ | |
1287 | ||
1288 | /* Reset BSY */ | |
1289 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); | |
1290 | ||
1291 | /* | |
1292 | * Something weird happens when we cease to drive BSY - looks | |
1293 | * like the board/chip is letting us do another read before the | |
1294 | * appropriate propagation delay has expired, and we're confusing | |
1295 | * a BSY signal from ourselves as the target's response to SELECTION. | |
1296 | * | |
1297 | * A small delay (the 'C++' frontend breaks the pipeline with an | |
1298 | * unnecessary jump, making it work on my 386-33/Trantor T128, the | |
1299 | * tighter 'C' code breaks and requires this) solves the problem - | |
1300 | * the 1 us delay is arbitrary, and only used because this delay will | |
1301 | * be the same on other platforms and since it works here, it should | |
1302 | * work there. | |
1303 | * | |
1304 | * wingel suggests that this could be due to failing to wait | |
1305 | * one deskew delay. | |
1306 | */ | |
1307 | ||
1308 | udelay(1); | |
1309 | ||
52a6a1cb | 1310 | dprintk(NDEBUG_SELECTION, "scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd)); |
1da177e4 LT |
1311 | |
1312 | /* | |
1313 | * The SCSI specification calls for a 250 ms timeout for the actual | |
1314 | * selection. | |
1315 | */ | |
1316 | ||
ae753a33 FT |
1317 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, SR_BSY, |
1318 | msecs_to_jiffies(250)); | |
1da177e4 | 1319 | |
1da177e4 LT |
1320 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { |
1321 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1322 | NCR5380_reselect(instance); | |
1323 | printk("scsi%d : reselection after won arbitration?\n", instance->host_no); | |
1324 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1325 | return -1; | |
1326 | } | |
ae753a33 FT |
1327 | |
1328 | if (err < 0) { | |
1329 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1330 | cmd->result = DID_BAD_TARGET << 16; | |
1331 | cmd->scsi_done(cmd); | |
1332 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1333 | dprintk(NDEBUG_SELECTION, "scsi%d : target did not respond within 250ms\n", | |
1334 | instance->host_no); | |
1335 | return 0; | |
1336 | } | |
1337 | ||
1da177e4 LT |
1338 | /* |
1339 | * No less than two deskew delays after the initiator detects the | |
1340 | * BSY signal is true, it shall release the SEL signal and may | |
1341 | * change the DATA BUS. -wingel | |
1342 | */ | |
1343 | ||
1344 | udelay(1); | |
1345 | ||
1346 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1347 | ||
1da177e4 LT |
1348 | /* |
1349 | * Since we followed the SCSI spec, and raised ATN while SEL | |
1350 | * was true but before BSY was false during selection, the information | |
1351 | * transfer phase should be a MESSAGE OUT phase so that we can send the | |
1352 | * IDENTIFY message. | |
1353 | * | |
1354 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG | |
1355 | * message (2 bytes) with a tag ID that we increment with every command | |
1356 | * until it wraps back to 0. | |
1357 | * | |
1358 | * XXX - it turns out that there are some broken SCSI-II devices, | |
1359 | * which claim to support tagged queuing but fail when more than | |
1360 | * some number of commands are issued at once. | |
1361 | */ | |
1362 | ||
1363 | /* Wait for start of REQ/ACK handshake */ | |
1364 | ||
1365 | spin_unlock_irq(instance->host_lock); | |
1366 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); | |
1367 | spin_lock_irq(instance->host_lock); | |
1368 | ||
1369 | if(err) { | |
1370 | printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__); | |
1371 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
6323876f | 1372 | return -1; |
1da177e4 LT |
1373 | } |
1374 | ||
52a6a1cb | 1375 | dprintk(NDEBUG_SELECTION, "scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id); |
22f5f10d | 1376 | tmp[0] = IDENTIFY(((instance->irq == NO_IRQ) ? 0 : 1), cmd->device->lun); |
1da177e4 LT |
1377 | |
1378 | len = 1; | |
1379 | cmd->tag = 0; | |
1380 | ||
1381 | /* Send message(s) */ | |
1382 | data = tmp; | |
1383 | phase = PHASE_MSGOUT; | |
1384 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
52a6a1cb | 1385 | dprintk(NDEBUG_SELECTION, "scsi%d : nexus established.\n", instance->host_no); |
1da177e4 LT |
1386 | /* XXX need to handle errors here */ |
1387 | hostdata->connected = cmd; | |
9cb78c16 | 1388 | hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF)); |
1da177e4 | 1389 | |
28424d3a | 1390 | initialize_SCp(cmd); |
1da177e4 LT |
1391 | |
1392 | return 0; | |
1da177e4 LT |
1393 | } |
1394 | ||
1395 | /* | |
1396 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, | |
1397 | * unsigned char *phase, int *count, unsigned char **data) | |
1398 | * | |
1399 | * Purpose : transfers data in given phase using polled I/O | |
1400 | * | |
1401 | * Inputs : instance - instance of driver, *phase - pointer to | |
1402 | * what phase is expected, *count - pointer to number of | |
1403 | * bytes to transfer, **data - pointer to data pointer. | |
1404 | * | |
1405 | * Returns : -1 when different phase is entered without transferring | |
25985edc | 1406 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1da177e4 LT |
1407 | * is in same phase. |
1408 | * | |
1409 | * Also, *phase, *count, *data are modified in place. | |
1410 | * | |
1411 | * XXX Note : handling for bus free may be useful. | |
1412 | */ | |
1413 | ||
1414 | /* | |
1415 | * Note : this code is not as quick as it could be, however it | |
1416 | * IS 100% reliable, and for the actual data transfer where speed | |
1417 | * counts, we will always do a pseudo DMA or DMA transfer. | |
1418 | */ | |
1419 | ||
1420 | static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { | |
1da177e4 LT |
1421 | unsigned char p = *phase, tmp; |
1422 | int c = *count; | |
1423 | unsigned char *d = *data; | |
1424 | /* | |
1425 | * RvC: some administrative data to process polling time | |
1426 | */ | |
1427 | int break_allowed = 0; | |
1428 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
1da177e4 LT |
1429 | |
1430 | if (!(p & SR_IO)) | |
52a6a1cb | 1431 | dprintk(NDEBUG_PIO, "scsi%d : pio write %d bytes\n", instance->host_no, c); |
1da177e4 | 1432 | else |
52a6a1cb | 1433 | dprintk(NDEBUG_PIO, "scsi%d : pio read %d bytes\n", instance->host_no, c); |
1da177e4 LT |
1434 | |
1435 | /* | |
1436 | * The NCR5380 chip will only drive the SCSI bus when the | |
1437 | * phase specified in the appropriate bits of the TARGET COMMAND | |
1438 | * REGISTER match the STATUS REGISTER | |
1439 | */ | |
1440 | ||
1441 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); | |
1442 | ||
1443 | /* RvC: don't know if this is necessary, but other SCSI I/O is short | |
1444 | * so breaks are not necessary there | |
1445 | */ | |
1446 | if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) { | |
1447 | break_allowed = 1; | |
1448 | } | |
1449 | do { | |
1450 | /* | |
1451 | * Wait for assertion of REQ, after which the phase bits will be | |
1452 | * valid | |
1453 | */ | |
1454 | ||
1455 | /* RvC: we simply poll once, after that we stop temporarily | |
1456 | * and let the device buffer fill up | |
1457 | * if breaking is not allowed, we keep polling as long as needed | |
1458 | */ | |
1459 | ||
1460 | /* FIXME */ | |
1461 | while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed); | |
1462 | if (!(tmp & SR_REQ)) { | |
1463 | /* timeout condition */ | |
1464 | NCR5380_set_timer(hostdata, USLEEP_SLEEP); | |
1465 | break; | |
1466 | } | |
1467 | ||
52a6a1cb | 1468 | dprintk(NDEBUG_HANDSHAKE, "scsi%d : REQ detected\n", instance->host_no); |
1da177e4 LT |
1469 | |
1470 | /* Check for phase mismatch */ | |
1471 | if ((tmp & PHASE_MASK) != p) { | |
52a6a1cb | 1472 | dprintk(NDEBUG_HANDSHAKE, "scsi%d : phase mismatch\n", instance->host_no); |
1da177e4 LT |
1473 | NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance); |
1474 | break; | |
1475 | } | |
1476 | /* Do actual transfer from SCSI bus to / from memory */ | |
1477 | if (!(p & SR_IO)) | |
1478 | NCR5380_write(OUTPUT_DATA_REG, *d); | |
1479 | else | |
1480 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
1481 | ||
1482 | ++d; | |
1483 | ||
1484 | /* | |
1485 | * The SCSI standard suggests that in MSGOUT phase, the initiator | |
1486 | * should drop ATN on the last byte of the message phase | |
1487 | * after REQ has been asserted for the handshake but before | |
1488 | * the initiator raises ACK. | |
1489 | */ | |
1490 | ||
1491 | if (!(p & SR_IO)) { | |
1492 | if (!((p & SR_MSG) && c > 1)) { | |
1493 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1494 | NCR5380_dprint(NDEBUG_PIO, instance); | |
1495 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK); | |
1496 | } else { | |
1497 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN); | |
1498 | NCR5380_dprint(NDEBUG_PIO, instance); | |
1499 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1500 | } | |
1501 | } else { | |
1502 | NCR5380_dprint(NDEBUG_PIO, instance); | |
1503 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); | |
1504 | } | |
1505 | ||
1506 | /* FIXME - if this fails bus reset ?? */ | |
1507 | NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ); | |
52a6a1cb | 1508 | dprintk(NDEBUG_HANDSHAKE, "scsi%d : req false, handshake complete\n", instance->host_no); |
1da177e4 LT |
1509 | |
1510 | /* | |
1511 | * We have several special cases to consider during REQ/ACK handshaking : | |
1512 | * 1. We were in MSGOUT phase, and we are on the last byte of the | |
1513 | * message. ATN must be dropped as ACK is dropped. | |
1514 | * | |
1515 | * 2. We are in a MSGIN phase, and we are on the last byte of the | |
1516 | * message. We must exit with ACK asserted, so that the calling | |
1517 | * code may raise ATN before dropping ACK to reject the message. | |
1518 | * | |
1519 | * 3. ACK and ATN are clear and the target may proceed as normal. | |
1520 | */ | |
1521 | if (!(p == PHASE_MSGIN && c == 1)) { | |
1522 | if (p == PHASE_MSGOUT && c > 1) | |
1523 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1524 | else | |
1525 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1526 | } | |
1527 | } while (--c); | |
1528 | ||
52a6a1cb | 1529 | dprintk(NDEBUG_PIO, "scsi%d : residual %d\n", instance->host_no, c); |
1da177e4 LT |
1530 | |
1531 | *count = c; | |
1532 | *data = d; | |
1533 | tmp = NCR5380_read(STATUS_REG); | |
1534 | if (tmp & SR_REQ) | |
1535 | *phase = tmp & PHASE_MASK; | |
1536 | else | |
1537 | *phase = PHASE_UNKNOWN; | |
1538 | ||
1539 | if (!c || (*phase == p)) | |
1540 | return 0; | |
1541 | else | |
1542 | return -1; | |
1543 | } | |
1544 | ||
1545 | /** | |
636b1ec8 FT |
1546 | * do_reset - issue a reset command |
1547 | * @instance: adapter to reset | |
1da177e4 | 1548 | * |
636b1ec8 FT |
1549 | * Issue a reset sequence to the NCR5380 and try and get the bus |
1550 | * back into sane shape. | |
1da177e4 | 1551 | * |
636b1ec8 FT |
1552 | * This clears the reset interrupt flag because there may be no handler for |
1553 | * it. When the driver is initialized, the NCR5380_intr() handler has not yet | |
1554 | * been installed. And when in EH we may have released the ST DMA interrupt. | |
1da177e4 LT |
1555 | */ |
1556 | ||
54d8fe44 FT |
1557 | static void do_reset(struct Scsi_Host *instance) |
1558 | { | |
636b1ec8 FT |
1559 | unsigned long flags; |
1560 | ||
1561 | local_irq_save(flags); | |
1562 | NCR5380_write(TARGET_COMMAND_REG, | |
1563 | PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); | |
1da177e4 | 1564 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); |
636b1ec8 | 1565 | udelay(50); |
1da177e4 | 1566 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
636b1ec8 FT |
1567 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1568 | local_irq_restore(flags); | |
1da177e4 LT |
1569 | } |
1570 | ||
1571 | /* | |
1572 | * Function : do_abort (Scsi_Host *host) | |
1573 | * | |
1574 | * Purpose : abort the currently established nexus. Should only be | |
1575 | * called from a routine which can drop into a | |
1576 | * | |
1577 | * Returns : 0 on success, -1 on failure. | |
1578 | * | |
1579 | * Locks: queue lock held by caller | |
1580 | * FIXME: sort this out and get new_eh running | |
1581 | */ | |
1582 | ||
54d8fe44 FT |
1583 | static int do_abort(struct Scsi_Host *instance) |
1584 | { | |
1da177e4 LT |
1585 | unsigned char *msgptr, phase, tmp; |
1586 | int len; | |
1587 | int rc; | |
1da177e4 LT |
1588 | |
1589 | /* Request message out phase */ | |
1590 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1591 | ||
1592 | /* | |
1593 | * Wait for the target to indicate a valid phase by asserting | |
1594 | * REQ. Once this happens, we'll have either a MSGOUT phase | |
1595 | * and can immediately send the ABORT message, or we'll have some | |
1596 | * other phase and will have to source/sink data. | |
1597 | * | |
1598 | * We really don't care what value was on the bus or what value | |
1599 | * the target sees, so we just handshake. | |
1600 | */ | |
1601 | ||
54d8fe44 | 1602 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ); |
1da177e4 LT |
1603 | |
1604 | if(rc < 0) | |
1605 | return -1; | |
1606 | ||
1607 | tmp = (unsigned char)rc; | |
1608 | ||
1609 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1610 | ||
1611 | if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { | |
1612 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
54d8fe44 | 1613 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 3 * HZ); |
1da177e4 LT |
1614 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
1615 | if(rc == -1) | |
1616 | return -1; | |
1617 | } | |
1618 | tmp = ABORT; | |
1619 | msgptr = &tmp; | |
1620 | len = 1; | |
1621 | phase = PHASE_MSGOUT; | |
54d8fe44 | 1622 | NCR5380_transfer_pio(instance, &phase, &len, &msgptr); |
1da177e4 LT |
1623 | |
1624 | /* | |
1625 | * If we got here, and the command completed successfully, | |
1626 | * we're about to go into bus free state. | |
1627 | */ | |
1628 | ||
1629 | return len ? -1 : 0; | |
1630 | } | |
1631 | ||
1632 | #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL) | |
1633 | /* | |
1634 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, | |
1635 | * unsigned char *phase, int *count, unsigned char **data) | |
1636 | * | |
1637 | * Purpose : transfers data in given phase using either real | |
1638 | * or pseudo DMA. | |
1639 | * | |
1640 | * Inputs : instance - instance of driver, *phase - pointer to | |
1641 | * what phase is expected, *count - pointer to number of | |
1642 | * bytes to transfer, **data - pointer to data pointer. | |
1643 | * | |
1644 | * Returns : -1 when different phase is entered without transferring | |
25985edc | 1645 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1da177e4 LT |
1646 | * is in same phase. |
1647 | * | |
1648 | * Also, *phase, *count, *data are modified in place. | |
1649 | * | |
1650 | * Locks: io_request lock held by caller | |
1651 | */ | |
1652 | ||
1653 | ||
1654 | static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { | |
1da177e4 LT |
1655 | register int c = *count; |
1656 | register unsigned char p = *phase; | |
1657 | register unsigned char *d = *data; | |
1658 | unsigned char tmp; | |
1659 | int foo; | |
1660 | #if defined(REAL_DMA_POLL) | |
1661 | int cnt, toPIO; | |
1662 | unsigned char saved_data = 0, overrun = 0, residue; | |
1663 | #endif | |
1664 | ||
1665 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
1666 | ||
1da177e4 LT |
1667 | if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { |
1668 | *phase = tmp; | |
1669 | return -1; | |
1670 | } | |
1671 | #if defined(REAL_DMA) || defined(REAL_DMA_POLL) | |
1672 | #ifdef READ_OVERRUNS | |
1673 | if (p & SR_IO) { | |
1674 | c -= 2; | |
1675 | } | |
1676 | #endif | |
52a6a1cb | 1677 | 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); |
1da177e4 LT |
1678 | hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c); |
1679 | #endif | |
1680 | ||
1681 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); | |
1682 | ||
1683 | #ifdef REAL_DMA | |
1684 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); | |
1685 | #elif defined(REAL_DMA_POLL) | |
1686 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); | |
1687 | #else | |
1688 | /* | |
1689 | * Note : on my sample board, watch-dog timeouts occurred when interrupts | |
1690 | * were not disabled for the duration of a single DMA transfer, from | |
1691 | * before the setting of DMA mode to after transfer of the last byte. | |
1692 | */ | |
1693 | ||
1694 | #if defined(PSEUDO_DMA) && defined(UNSAFE) | |
1695 | spin_unlock_irq(instance->host_lock); | |
1696 | #endif | |
1697 | /* KLL May need eop and parity in 53c400 */ | |
1698 | if (hostdata->flags & FLAG_NCR53C400) | |
085267ac RK |
1699 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | |
1700 | MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR | | |
1701 | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); | |
1da177e4 LT |
1702 | else |
1703 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); | |
1704 | #endif /* def REAL_DMA */ | |
1705 | ||
52a6a1cb | 1706 | dprintk(NDEBUG_DMA, "scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG)); |
1da177e4 LT |
1707 | |
1708 | /* | |
1709 | * On the PAS16 at least I/O recovery delays are not needed here. | |
1710 | * Everyone else seems to want them. | |
1711 | */ | |
1712 | ||
1713 | if (p & SR_IO) { | |
1714 | io_recovery_delay(1); | |
1715 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); | |
1716 | } else { | |
1717 | io_recovery_delay(1); | |
1718 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1719 | io_recovery_delay(1); | |
1720 | NCR5380_write(START_DMA_SEND_REG, 0); | |
1721 | io_recovery_delay(1); | |
1722 | } | |
1723 | ||
1724 | #if defined(REAL_DMA_POLL) | |
1725 | do { | |
1726 | tmp = NCR5380_read(BUS_AND_STATUS_REG); | |
1727 | } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER))); | |
1728 | ||
1729 | /* | |
1730 | At this point, either we've completed DMA, or we have a phase mismatch, | |
1731 | or we've unexpectedly lost BUSY (which is a real error). | |
1732 | ||
1733 | For write DMAs, we want to wait until the last byte has been | |
1734 | transferred out over the bus before we turn off DMA mode. Alas, there | |
1735 | seems to be no terribly good way of doing this on a 5380 under all | |
1736 | conditions. For non-scatter-gather operations, we can wait until REQ | |
1737 | and ACK both go false, or until a phase mismatch occurs. Gather-writes | |
1738 | are nastier, since the device will be expecting more data than we | |
1739 | are prepared to send it, and REQ will remain asserted. On a 53C8[01] we | |
1740 | could test LAST BIT SENT to assure transfer (I imagine this is precisely | |
1741 | why this signal was added to the newer chips) but on the older 538[01] | |
1742 | this signal does not exist. The workaround for this lack is a watchdog; | |
1743 | we bail out of the wait-loop after a modest amount of wait-time if | |
1744 | the usual exit conditions are not met. Not a terribly clean or | |
1745 | correct solution :-% | |
1746 | ||
1747 | Reads are equally tricky due to a nasty characteristic of the NCR5380. | |
1748 | If the chip is in DMA mode for an READ, it will respond to a target's | |
1749 | REQ by latching the SCSI data into the INPUT DATA register and asserting | |
1750 | ACK, even if it has _already_ been notified by the DMA controller that | |
1751 | the current DMA transfer has completed! If the NCR5380 is then taken | |
1752 | out of DMA mode, this already-acknowledged byte is lost. | |
1753 | ||
1754 | This is not a problem for "one DMA transfer per command" reads, because | |
1755 | the situation will never arise... either all of the data is DMA'ed | |
1756 | properly, or the target switches to MESSAGE IN phase to signal a | |
1757 | disconnection (either operation bringing the DMA to a clean halt). | |
1758 | However, in order to handle scatter-reads, we must work around the | |
1759 | problem. The chosen fix is to DMA N-2 bytes, then check for the | |
1760 | condition before taking the NCR5380 out of DMA mode. One or two extra | |
1761 | bytes are transferred via PIO as necessary to fill out the original | |
1762 | request. | |
1763 | */ | |
1764 | ||
1765 | if (p & SR_IO) { | |
1766 | #ifdef READ_OVERRUNS | |
1767 | udelay(10); | |
1768 | if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) { | |
1769 | saved_data = NCR5380_read(INPUT_DATA_REGISTER); | |
1770 | overrun = 1; | |
1771 | } | |
1772 | #endif | |
1773 | } else { | |
1774 | int limit = 100; | |
1775 | while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) { | |
1776 | if (!(tmp & BASR_PHASE_MATCH)) | |
1777 | break; | |
1778 | if (--limit < 0) | |
1779 | break; | |
1780 | } | |
1781 | } | |
1782 | ||
52a6a1cb | 1783 | dprintk(NDEBUG_DMA, "scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG)); |
1da177e4 LT |
1784 | |
1785 | NCR5380_write(MODE_REG, MR_BASE); | |
1786 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1787 | ||
1788 | residue = NCR5380_dma_residual(instance); | |
1789 | c -= residue; | |
1790 | *count -= c; | |
1791 | *data += c; | |
1792 | *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; | |
1793 | ||
1794 | #ifdef READ_OVERRUNS | |
1795 | if (*phase == p && (p & SR_IO) && residue == 0) { | |
1796 | if (overrun) { | |
52a6a1cb | 1797 | dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n"); |
1da177e4 LT |
1798 | **data = saved_data; |
1799 | *data += 1; | |
1800 | *count -= 1; | |
1801 | cnt = toPIO = 1; | |
1802 | } else { | |
1803 | printk("No overrun??\n"); | |
1804 | cnt = toPIO = 2; | |
1805 | } | |
52a6a1cb | 1806 | dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%X\n", cnt, *data); |
1da177e4 LT |
1807 | NCR5380_transfer_pio(instance, phase, &cnt, data); |
1808 | *count -= toPIO - cnt; | |
1809 | } | |
1810 | #endif | |
1811 | ||
52a6a1cb | 1812 | 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)); |
1da177e4 LT |
1813 | return 0; |
1814 | ||
1815 | #elif defined(REAL_DMA) | |
1816 | return 0; | |
1817 | #else /* defined(REAL_DMA_POLL) */ | |
1818 | if (p & SR_IO) { | |
1819 | #ifdef DMA_WORKS_RIGHT | |
1820 | foo = NCR5380_pread(instance, d, c); | |
1821 | #else | |
1822 | int diff = 1; | |
1823 | if (hostdata->flags & FLAG_NCR53C400) { | |
1824 | diff = 0; | |
1825 | } | |
1826 | if (!(foo = NCR5380_pread(instance, d, c - diff))) { | |
1827 | /* | |
1828 | * We can't disable DMA mode after successfully transferring | |
1829 | * what we plan to be the last byte, since that would open up | |
1830 | * a race condition where if the target asserted REQ before | |
1831 | * we got the DMA mode reset, the NCR5380 would have latched | |
1832 | * an additional byte into the INPUT DATA register and we'd | |
1833 | * have dropped it. | |
1834 | * | |
1835 | * The workaround was to transfer one fewer bytes than we | |
1836 | * intended to with the pseudo-DMA read function, wait for | |
1837 | * the chip to latch the last byte, read it, and then disable | |
1838 | * pseudo-DMA mode. | |
1839 | * | |
1840 | * After REQ is asserted, the NCR5380 asserts DRQ and ACK. | |
1841 | * REQ is deasserted when ACK is asserted, and not reasserted | |
1842 | * until ACK goes false. Since the NCR5380 won't lower ACK | |
1843 | * until DACK is asserted, which won't happen unless we twiddle | |
1844 | * the DMA port or we take the NCR5380 out of DMA mode, we | |
1845 | * can guarantee that we won't handshake another extra | |
1846 | * byte. | |
1847 | */ | |
1848 | ||
1849 | if (!(hostdata->flags & FLAG_NCR53C400)) { | |
1850 | while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)); | |
1851 | /* Wait for clean handshake */ | |
1852 | while (NCR5380_read(STATUS_REG) & SR_REQ); | |
1853 | d[c - 1] = NCR5380_read(INPUT_DATA_REG); | |
1854 | } | |
1855 | } | |
1856 | #endif | |
1857 | } else { | |
1858 | #ifdef DMA_WORKS_RIGHT | |
1859 | foo = NCR5380_pwrite(instance, d, c); | |
1860 | #else | |
1861 | int timeout; | |
52a6a1cb | 1862 | dprintk(NDEBUG_C400_PWRITE, "About to pwrite %d bytes\n", c); |
1da177e4 LT |
1863 | if (!(foo = NCR5380_pwrite(instance, d, c))) { |
1864 | /* | |
1865 | * Wait for the last byte to be sent. If REQ is being asserted for | |
1866 | * the byte we're interested, we'll ACK it and it will go false. | |
1867 | */ | |
1868 | if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) { | |
1869 | timeout = 20000; | |
1870 | while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)); | |
1871 | ||
1872 | if (!timeout) | |
52a6a1cb | 1873 | dprintk(NDEBUG_LAST_BYTE_SENT, "scsi%d : timed out on last byte\n", instance->host_no); |
1da177e4 LT |
1874 | |
1875 | if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) { | |
1876 | hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT; | |
1877 | if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) { | |
1878 | hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT; | |
52a6a1cb | 1879 | dprintk(NDEBUG_LAST_BYTE_SENT, "scsi%d : last byte sent works\n", instance->host_no); |
1da177e4 LT |
1880 | } |
1881 | } | |
1882 | } else { | |
52a6a1cb | 1883 | dprintk(NDEBUG_C400_PWRITE, "Waiting for LASTBYTE\n"); |
1da177e4 | 1884 | while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT)); |
52a6a1cb | 1885 | dprintk(NDEBUG_C400_PWRITE, "Got LASTBYTE\n"); |
1da177e4 LT |
1886 | } |
1887 | } | |
1888 | #endif | |
1889 | } | |
1890 | NCR5380_write(MODE_REG, MR_BASE); | |
1891 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1892 | ||
1893 | if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) { | |
52a6a1cb | 1894 | dprintk(NDEBUG_C400_PWRITE, "53C400w: Checking for IRQ\n"); |
1da177e4 | 1895 | if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) { |
52a6a1cb | 1896 | dprintk(NDEBUG_C400_PWRITE, "53C400w: got it, reading reset interrupt reg\n"); |
1da177e4 LT |
1897 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1898 | } else { | |
1899 | printk("53C400w: IRQ NOT THERE!\n"); | |
1900 | } | |
1901 | } | |
1902 | *data = d + c; | |
1903 | *count = 0; | |
1904 | *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; | |
1905 | #if defined(PSEUDO_DMA) && defined(UNSAFE) | |
1906 | spin_lock_irq(instance->host_lock); | |
1907 | #endif /* defined(REAL_DMA_POLL) */ | |
1908 | return foo; | |
1909 | #endif /* def REAL_DMA */ | |
1910 | } | |
1911 | #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */ | |
1912 | ||
1913 | /* | |
1914 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) | |
1915 | * | |
1916 | * Purpose : run through the various SCSI phases and do as the target | |
1917 | * directs us to. Operates on the currently connected command, | |
1918 | * instance->connected. | |
1919 | * | |
1920 | * Inputs : instance, instance for which we are doing commands | |
1921 | * | |
1922 | * Side effects : SCSI things happen, the disconnected queue will be | |
1923 | * modified if a command disconnects, *instance->connected will | |
1924 | * change. | |
1925 | * | |
1926 | * XXX Note : we need to watch for bus free or a reset condition here | |
1927 | * to recover from an unexpected bus free condition. | |
1928 | * | |
1929 | * Locks: io_request_lock held by caller in IRQ mode | |
1930 | */ | |
1931 | ||
1932 | static void NCR5380_information_transfer(struct Scsi_Host *instance) { | |
1da177e4 LT |
1933 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata; |
1934 | unsigned char msgout = NOP; | |
1935 | int sink = 0; | |
1936 | int len; | |
1937 | #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) | |
1938 | int transfersize; | |
1939 | #endif | |
1940 | unsigned char *data; | |
1941 | unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; | |
710ddd0d | 1942 | struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected; |
1da177e4 LT |
1943 | /* RvC: we need to set the end of the polling time */ |
1944 | unsigned long poll_time = jiffies + USLEEP_POLL; | |
1945 | ||
1da177e4 LT |
1946 | while (1) { |
1947 | tmp = NCR5380_read(STATUS_REG); | |
1948 | /* We only have a valid SCSI phase when REQ is asserted */ | |
1949 | if (tmp & SR_REQ) { | |
1950 | phase = (tmp & PHASE_MASK); | |
1951 | if (phase != old_phase) { | |
1952 | old_phase = phase; | |
1953 | NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); | |
1954 | } | |
1955 | if (sink && (phase != PHASE_MSGOUT)) { | |
1956 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1957 | ||
1958 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1959 | while (NCR5380_read(STATUS_REG) & SR_REQ); | |
1960 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1961 | sink = 0; | |
1962 | continue; | |
1963 | } | |
1964 | switch (phase) { | |
1965 | case PHASE_DATAIN: | |
1966 | case PHASE_DATAOUT: | |
1967 | #if (NDEBUG & NDEBUG_NO_DATAOUT) | |
1968 | printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no); | |
1969 | sink = 1; | |
1970 | do_abort(instance); | |
1971 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 1972 | cmd->scsi_done(cmd); |
1da177e4 LT |
1973 | return; |
1974 | #endif | |
1975 | /* | |
1976 | * If there is no room left in the current buffer in the | |
1977 | * scatter-gather list, move onto the next one. | |
1978 | */ | |
1979 | ||
1980 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1981 | ++cmd->SCp.buffer; | |
1982 | --cmd->SCp.buffers_residual; | |
1983 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
45711f1a | 1984 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
52a6a1cb | 1985 | dprintk(NDEBUG_INFORMATION, "scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual); |
1da177e4 LT |
1986 | } |
1987 | /* | |
1988 | * The preferred transfer method is going to be | |
1989 | * PSEUDO-DMA for systems that are strictly PIO, | |
1990 | * since we can let the hardware do the handshaking. | |
1991 | * | |
1992 | * For this to work, we need to know the transfersize | |
1993 | * ahead of time, since the pseudo-DMA code will sit | |
1994 | * in an unconditional loop. | |
1995 | */ | |
1996 | ||
1997 | #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) | |
ff3d4578 FT |
1998 | transfersize = 0; |
1999 | if (!cmd->device->borken && | |
2000 | !(hostdata->flags & FLAG_NO_PSEUDO_DMA)) | |
2001 | transfersize = NCR5380_dma_xfer_len(instance, cmd, phase); | |
2002 | ||
2003 | if (transfersize) { | |
1da177e4 LT |
2004 | len = transfersize; |
2005 | if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) { | |
2006 | /* | |
2007 | * If the watchdog timer fires, all future accesses to this | |
2008 | * device will use the polled-IO. | |
2009 | */ | |
017560fc JG |
2010 | scmd_printk(KERN_INFO, cmd, |
2011 | "switching to slow handshake\n"); | |
1da177e4 | 2012 | cmd->device->borken = 1; |
1da177e4 LT |
2013 | sink = 1; |
2014 | do_abort(instance); | |
2015 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 2016 | cmd->scsi_done(cmd); |
1da177e4 LT |
2017 | /* XXX - need to source or sink data here, as appropriate */ |
2018 | } else | |
2019 | cmd->SCp.this_residual -= transfersize - len; | |
2020 | } else | |
2021 | #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */ | |
2022 | NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **) | |
2023 | &cmd->SCp.ptr); | |
2024 | break; | |
2025 | case PHASE_MSGIN: | |
2026 | len = 1; | |
2027 | data = &tmp; | |
2028 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2029 | cmd->SCp.Message = tmp; | |
2030 | ||
2031 | switch (tmp) { | |
2032 | /* | |
2033 | * Linking lets us reduce the time required to get the | |
2034 | * next command out to the device, hopefully this will | |
2035 | * mean we don't waste another revolution due to the delays | |
2036 | * required by ARBITRATION and another SELECTION. | |
2037 | * | |
2038 | * In the current implementation proposal, low level drivers | |
2039 | * merely have to start the next command, pointed to by | |
2040 | * next_link, done() is called as with unlinked commands. | |
2041 | */ | |
2042 | #ifdef LINKED | |
2043 | case LINKED_CMD_COMPLETE: | |
2044 | case LINKED_FLG_CMD_COMPLETE: | |
2045 | /* Accept message by clearing ACK */ | |
2046 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
9cb78c16 | 2047 | dprintk(NDEBUG_LINKED, "scsi%d : target %d lun %llu linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun); |
1da177e4 LT |
2048 | /* |
2049 | * Sanity check : A linked command should only terminate with | |
2050 | * one of these messages if there are more linked commands | |
2051 | * available. | |
2052 | */ | |
2053 | if (!cmd->next_link) { | |
9cb78c16 | 2054 | printk("scsi%d : target %d lun %llu linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun); |
1da177e4 LT |
2055 | sink = 1; |
2056 | do_abort(instance); | |
2057 | return; | |
2058 | } | |
2059 | initialize_SCp(cmd->next_link); | |
2060 | /* The next command is still part of this process */ | |
2061 | cmd->next_link->tag = cmd->tag; | |
2062 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | |
9cb78c16 | 2063 | dprintk(NDEBUG_LINKED, "scsi%d : target %d lun %llu linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun); |
1da177e4 LT |
2064 | cmd->scsi_done(cmd); |
2065 | cmd = hostdata->connected; | |
2066 | break; | |
2067 | #endif /* def LINKED */ | |
2068 | case ABORT: | |
2069 | case COMMAND_COMPLETE: | |
2070 | /* Accept message by clearing ACK */ | |
2071 | sink = 1; | |
2072 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2073 | hostdata->connected = NULL; | |
9cb78c16 HR |
2074 | dprintk(NDEBUG_QUEUES, "scsi%d : command for target %d, lun %llu completed\n", instance->host_no, cmd->device->id, cmd->device->lun); |
2075 | hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xFF)); | |
1da177e4 LT |
2076 | |
2077 | /* | |
2078 | * I'm not sure what the correct thing to do here is : | |
2079 | * | |
2080 | * If the command that just executed is NOT a request | |
2081 | * sense, the obvious thing to do is to set the result | |
2082 | * code to the values of the stored parameters. | |
2083 | * | |
2084 | * If it was a REQUEST SENSE command, we need some way | |
2085 | * to differentiate between the failure code of the original | |
2086 | * and the failure code of the REQUEST sense - the obvious | |
2087 | * case is success, where we fall through and leave the result | |
2088 | * code unchanged. | |
2089 | * | |
2090 | * The non-obvious place is where the REQUEST SENSE failed | |
2091 | */ | |
2092 | ||
2093 | if (cmd->cmnd[0] != REQUEST_SENSE) | |
2094 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | |
2095 | else if (status_byte(cmd->SCp.Status) != GOOD) | |
2096 | cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); | |
2097 | ||
28424d3a BH |
2098 | if ((cmd->cmnd[0] == REQUEST_SENSE) && |
2099 | hostdata->ses.cmd_len) { | |
2100 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
2101 | hostdata->ses.cmd_len = 0 ; | |
2102 | } | |
2103 | ||
1da177e4 | 2104 | if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { |
28424d3a BH |
2105 | scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); |
2106 | ||
52a6a1cb | 2107 | dprintk(NDEBUG_AUTOSENSE, "scsi%d : performing request sense\n", instance->host_no); |
1da177e4 LT |
2108 | |
2109 | LIST(cmd, hostdata->issue_queue); | |
2110 | cmd->host_scribble = (unsigned char *) | |
2111 | hostdata->issue_queue; | |
710ddd0d | 2112 | hostdata->issue_queue = (struct scsi_cmnd *) cmd; |
52a6a1cb | 2113 | dprintk(NDEBUG_QUEUES, "scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no); |
997acab7 | 2114 | } else { |
1da177e4 LT |
2115 | cmd->scsi_done(cmd); |
2116 | } | |
2117 | ||
2118 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2119 | /* | |
2120 | * Restore phase bits to 0 so an interrupted selection, | |
2121 | * arbitration can resume. | |
2122 | */ | |
2123 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2124 | ||
2125 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) | |
2126 | barrier(); | |
2127 | return; | |
2128 | case MESSAGE_REJECT: | |
2129 | /* Accept message by clearing ACK */ | |
2130 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2131 | switch (hostdata->last_message) { | |
2132 | case HEAD_OF_QUEUE_TAG: | |
2133 | case ORDERED_QUEUE_TAG: | |
2134 | case SIMPLE_QUEUE_TAG: | |
2135 | cmd->device->simple_tags = 0; | |
9cb78c16 | 2136 | hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF)); |
1da177e4 LT |
2137 | break; |
2138 | default: | |
2139 | break; | |
2140 | } | |
2141 | case DISCONNECT:{ | |
2142 | /* Accept message by clearing ACK */ | |
2143 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2144 | cmd->device->disconnect = 1; | |
2145 | LIST(cmd, hostdata->disconnected_queue); | |
2146 | cmd->host_scribble = (unsigned char *) | |
2147 | hostdata->disconnected_queue; | |
2148 | hostdata->connected = NULL; | |
2149 | hostdata->disconnected_queue = cmd; | |
9cb78c16 | 2150 | dprintk(NDEBUG_QUEUES, "scsi%d : command for target %d lun %llu was moved from connected to" " the disconnected_queue\n", instance->host_no, cmd->device->id, cmd->device->lun); |
1da177e4 LT |
2151 | /* |
2152 | * Restore phase bits to 0 so an interrupted selection, | |
2153 | * arbitration can resume. | |
2154 | */ | |
2155 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2156 | ||
2157 | /* Enable reselect interrupts */ | |
2158 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2159 | /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/ | |
2160 | /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */ | |
2161 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) | |
2162 | barrier(); | |
2163 | return; | |
2164 | } | |
2165 | /* | |
2166 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect | |
2167 | * operation, in violation of the SCSI spec so we can safely | |
2168 | * ignore SAVE/RESTORE pointers calls. | |
2169 | * | |
2170 | * Unfortunately, some disks violate the SCSI spec and | |
2171 | * don't issue the required SAVE_POINTERS message before | |
2172 | * disconnecting, and we have to break spec to remain | |
2173 | * compatible. | |
2174 | */ | |
2175 | case SAVE_POINTERS: | |
2176 | case RESTORE_POINTERS: | |
2177 | /* Accept message by clearing ACK */ | |
2178 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2179 | break; | |
2180 | case EXTENDED_MESSAGE: | |
2181 | /* | |
2182 | * Extended messages are sent in the following format : | |
2183 | * Byte | |
2184 | * 0 EXTENDED_MESSAGE == 1 | |
2185 | * 1 length (includes one byte for code, doesn't | |
2186 | * include first two bytes) | |
2187 | * 2 code | |
2188 | * 3..length+1 arguments | |
2189 | * | |
2190 | * Start the extended message buffer with the EXTENDED_MESSAGE | |
1abfd370 | 2191 | * byte, since spi_print_msg() wants the whole thing. |
1da177e4 LT |
2192 | */ |
2193 | extended_msg[0] = EXTENDED_MESSAGE; | |
2194 | /* Accept first byte by clearing ACK */ | |
2195 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
52a6a1cb | 2196 | dprintk(NDEBUG_EXTENDED, "scsi%d : receiving extended message\n", instance->host_no); |
1da177e4 LT |
2197 | |
2198 | len = 2; | |
2199 | data = extended_msg + 1; | |
2200 | phase = PHASE_MSGIN; | |
2201 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2202 | ||
52a6a1cb | 2203 | dprintk(NDEBUG_EXTENDED, "scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2]); |
1da177e4 LT |
2204 | |
2205 | if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) { | |
2206 | /* Accept third byte by clearing ACK */ | |
2207 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2208 | len = extended_msg[1] - 1; | |
2209 | data = extended_msg + 3; | |
2210 | phase = PHASE_MSGIN; | |
2211 | ||
2212 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
52a6a1cb | 2213 | dprintk(NDEBUG_EXTENDED, "scsi%d : message received, residual %d\n", instance->host_no, len); |
1da177e4 LT |
2214 | |
2215 | switch (extended_msg[2]) { | |
2216 | case EXTENDED_SDTR: | |
2217 | case EXTENDED_WDTR: | |
2218 | case EXTENDED_MODIFY_DATA_POINTER: | |
2219 | case EXTENDED_EXTENDED_IDENTIFY: | |
2220 | tmp = 0; | |
2221 | } | |
2222 | } else if (len) { | |
2223 | printk("scsi%d: error receiving extended message\n", instance->host_no); | |
2224 | tmp = 0; | |
2225 | } else { | |
2226 | printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]); | |
2227 | tmp = 0; | |
2228 | } | |
2229 | /* Fall through to reject message */ | |
2230 | ||
2231 | /* | |
2232 | * If we get something weird that we aren't expecting, | |
2233 | * reject it. | |
2234 | */ | |
2235 | default: | |
2236 | if (!tmp) { | |
2237 | printk("scsi%d: rejecting message ", instance->host_no); | |
1abfd370 | 2238 | spi_print_msg(extended_msg); |
1da177e4 LT |
2239 | printk("\n"); |
2240 | } else if (tmp != EXTENDED_MESSAGE) | |
017560fc JG |
2241 | scmd_printk(KERN_INFO, cmd, |
2242 | "rejecting unknown message %02x\n",tmp); | |
1da177e4 | 2243 | else |
017560fc JG |
2244 | scmd_printk(KERN_INFO, cmd, |
2245 | "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]); | |
1da177e4 LT |
2246 | |
2247 | msgout = MESSAGE_REJECT; | |
2248 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
2249 | break; | |
2250 | } /* switch (tmp) */ | |
2251 | break; | |
2252 | case PHASE_MSGOUT: | |
2253 | len = 1; | |
2254 | data = &msgout; | |
2255 | hostdata->last_message = msgout; | |
2256 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2257 | if (msgout == ABORT) { | |
9cb78c16 | 2258 | hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xFF)); |
1da177e4 LT |
2259 | hostdata->connected = NULL; |
2260 | cmd->result = DID_ERROR << 16; | |
1da177e4 LT |
2261 | cmd->scsi_done(cmd); |
2262 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2263 | return; | |
2264 | } | |
2265 | msgout = NOP; | |
2266 | break; | |
2267 | case PHASE_CMDOUT: | |
2268 | len = cmd->cmd_len; | |
2269 | data = cmd->cmnd; | |
2270 | /* | |
2271 | * XXX for performance reasons, on machines with a | |
2272 | * PSEUDO-DMA architecture we should probably | |
2273 | * use the dma transfer function. | |
2274 | */ | |
2275 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2276 | if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) { | |
2277 | NCR5380_set_timer(hostdata, USLEEP_SLEEP); | |
52a6a1cb | 2278 | dprintk(NDEBUG_USLEEP, "scsi%d : issued command, sleeping until %lu\n", instance->host_no, hostdata->time_expires); |
1da177e4 LT |
2279 | return; |
2280 | } | |
2281 | break; | |
2282 | case PHASE_STATIN: | |
2283 | len = 1; | |
2284 | data = &tmp; | |
2285 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2286 | cmd->SCp.Status = tmp; | |
2287 | break; | |
2288 | default: | |
2289 | printk("scsi%d : unknown phase\n", instance->host_no); | |
4dde8f7d | 2290 | NCR5380_dprint(NDEBUG_ANY, instance); |
1da177e4 LT |
2291 | } /* switch(phase) */ |
2292 | } /* if (tmp * SR_REQ) */ | |
2293 | else { | |
2294 | /* RvC: go to sleep if polling time expired | |
2295 | */ | |
2296 | if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) { | |
2297 | NCR5380_set_timer(hostdata, USLEEP_SLEEP); | |
52a6a1cb | 2298 | dprintk(NDEBUG_USLEEP, "scsi%d : poll timed out, sleeping until %lu\n", instance->host_no, hostdata->time_expires); |
1da177e4 LT |
2299 | return; |
2300 | } | |
2301 | } | |
2302 | } /* while (1) */ | |
2303 | } | |
2304 | ||
2305 | /* | |
2306 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) | |
2307 | * | |
2308 | * Purpose : does reselection, initializing the instance->connected | |
710ddd0d | 2309 | * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q |
1da177e4 LT |
2310 | * nexus has been reestablished, |
2311 | * | |
2312 | * Inputs : instance - this instance of the NCR5380. | |
2313 | * | |
2314 | * Locks: io_request_lock held by caller if IRQ driven | |
2315 | */ | |
2316 | ||
2317 | static void NCR5380_reselect(struct Scsi_Host *instance) { | |
1da177e4 LT |
2318 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) |
2319 | instance->hostdata; | |
2320 | unsigned char target_mask; | |
2321 | unsigned char lun, phase; | |
2322 | int len; | |
2323 | unsigned char msg[3]; | |
2324 | unsigned char *data; | |
710ddd0d | 2325 | struct scsi_cmnd *tmp = NULL, *prev; |
1da177e4 | 2326 | int abort = 0; |
1da177e4 LT |
2327 | |
2328 | /* | |
2329 | * Disable arbitration, etc. since the host adapter obviously | |
2330 | * lost, and tell an interrupted NCR5380_select() to restart. | |
2331 | */ | |
2332 | ||
2333 | NCR5380_write(MODE_REG, MR_BASE); | |
1da177e4 LT |
2334 | |
2335 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); | |
52a6a1cb | 2336 | dprintk(NDEBUG_SELECTION, "scsi%d : reselect\n", instance->host_no); |
1da177e4 LT |
2337 | |
2338 | /* | |
2339 | * At this point, we have detected that our SCSI ID is on the bus, | |
2340 | * SEL is true and BSY was false for at least one bus settle delay | |
2341 | * (400 ns). | |
2342 | * | |
2343 | * We must assert BSY ourselves, until the target drops the SEL | |
2344 | * signal. | |
2345 | */ | |
2346 | ||
2347 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); | |
2348 | ||
2349 | /* FIXME: timeout too long, must fail to workqueue */ | |
2350 | if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0) | |
2351 | abort = 1; | |
2352 | ||
2353 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2354 | ||
2355 | /* | |
2356 | * Wait for target to go into MSGIN. | |
2357 | * FIXME: timeout needed and fail to work queeu | |
2358 | */ | |
2359 | ||
2360 | if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ)) | |
2361 | abort = 1; | |
2362 | ||
2363 | len = 1; | |
2364 | data = msg; | |
2365 | phase = PHASE_MSGIN; | |
2366 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2367 | ||
2368 | if (!(msg[0] & 0x80)) { | |
2369 | printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no); | |
1abfd370 | 2370 | spi_print_msg(msg); |
1da177e4 LT |
2371 | abort = 1; |
2372 | } else { | |
2373 | /* Accept message by clearing ACK */ | |
2374 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2375 | lun = (msg[0] & 0x07); | |
2376 | ||
2377 | /* | |
2378 | * We need to add code for SCSI-II to track which devices have | |
2379 | * I_T_L_Q nexuses established, and which have simple I_T_L | |
2380 | * nexuses so we can chose to do additional data transfer. | |
2381 | */ | |
2382 | ||
2383 | /* | |
2384 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we | |
2385 | * just reestablished, and remove it from the disconnected queue. | |
2386 | */ | |
2387 | ||
2388 | ||
710ddd0d | 2389 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (struct scsi_cmnd *) tmp->host_scribble) |
9cb78c16 | 2390 | if ((target_mask == (1 << tmp->device->id)) && (lun == (u8)tmp->device->lun) |
1da177e4 LT |
2391 | ) { |
2392 | if (prev) { | |
2393 | REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); | |
2394 | prev->host_scribble = tmp->host_scribble; | |
2395 | } else { | |
2396 | REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble); | |
710ddd0d | 2397 | hostdata->disconnected_queue = (struct scsi_cmnd *) tmp->host_scribble; |
1da177e4 LT |
2398 | } |
2399 | tmp->host_scribble = NULL; | |
2400 | break; | |
2401 | } | |
2402 | if (!tmp) { | |
2403 | printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun); | |
2404 | /* | |
2405 | * Since we have an established nexus that we can't do anything with, | |
2406 | * we must abort it. | |
2407 | */ | |
2408 | abort = 1; | |
2409 | } | |
2410 | } | |
2411 | ||
2412 | if (abort) { | |
2413 | do_abort(instance); | |
2414 | } else { | |
2415 | hostdata->connected = tmp; | |
9cb78c16 | 2416 | dprintk(NDEBUG_RESELECTION, "scsi%d : nexus established, target = %d, lun = %llu, tag = %d\n", instance->host_no, tmp->device->id, tmp->device->lun, tmp->tag); |
1da177e4 LT |
2417 | } |
2418 | } | |
2419 | ||
2420 | /* | |
2421 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) | |
2422 | * | |
2423 | * Purpose : called by interrupt handler when DMA finishes or a phase | |
2424 | * mismatch occurs (which would finish the DMA transfer). | |
2425 | * | |
2426 | * Inputs : instance - this instance of the NCR5380. | |
2427 | * | |
710ddd0d | 2428 | * Returns : pointer to the scsi_cmnd structure for which the I_T_L |
1da177e4 LT |
2429 | * nexus has been reestablished, on failure NULL is returned. |
2430 | */ | |
2431 | ||
2432 | #ifdef REAL_DMA | |
2433 | static void NCR5380_dma_complete(NCR5380_instance * instance) { | |
f8343685 | 2434 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
1da177e4 | 2435 | int transferred; |
1da177e4 LT |
2436 | |
2437 | /* | |
2438 | * XXX this might not be right. | |
2439 | * | |
2440 | * Wait for final byte to transfer, ie wait for ACK to go false. | |
2441 | * | |
2442 | * We should use the Last Byte Sent bit, unfortunately this is | |
2443 | * not available on the 5380/5381 (only the various CMOS chips) | |
2444 | * | |
2445 | * FIXME: timeout, and need to handle long timeout/irq case | |
2446 | */ | |
2447 | ||
2448 | NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ); | |
2449 | ||
2450 | NCR5380_write(MODE_REG, MR_BASE); | |
2451 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2452 | ||
2453 | /* | |
2454 | * The only places we should see a phase mismatch and have to send | |
2455 | * data from the same set of pointers will be the data transfer | |
2456 | * phases. So, residual, requested length are only important here. | |
2457 | */ | |
2458 | ||
2459 | if (!(hostdata->connected->SCp.phase & SR_CD)) { | |
2460 | transferred = instance->dmalen - NCR5380_dma_residual(); | |
2461 | hostdata->connected->SCp.this_residual -= transferred; | |
2462 | hostdata->connected->SCp.ptr += transferred; | |
2463 | } | |
2464 | } | |
2465 | #endif /* def REAL_DMA */ | |
2466 | ||
2467 | /* | |
710ddd0d | 2468 | * Function : int NCR5380_abort (struct scsi_cmnd *cmd) |
1da177e4 LT |
2469 | * |
2470 | * Purpose : abort a command | |
2471 | * | |
710ddd0d | 2472 | * Inputs : cmd - the scsi_cmnd to abort, code - code to set the |
b6c92b7e | 2473 | * host byte of the result field to, if zero DID_ABORTED is |
1da177e4 LT |
2474 | * used. |
2475 | * | |
b6c92b7e | 2476 | * Returns : SUCCESS - success, FAILED on failure. |
1da177e4 | 2477 | * |
b6c92b7e HR |
2478 | * XXX - there is no way to abort the command that is currently |
2479 | * connected, you have to wait for it to complete. If this is | |
1da177e4 LT |
2480 | * a problem, we could implement longjmp() / setjmp(), setjmp() |
2481 | * called where the loop started in NCR5380_main(). | |
2482 | * | |
2483 | * Locks: host lock taken by caller | |
2484 | */ | |
2485 | ||
710ddd0d FT |
2486 | static int NCR5380_abort(struct scsi_cmnd *cmd) |
2487 | { | |
1da177e4 LT |
2488 | struct Scsi_Host *instance = cmd->device->host; |
2489 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
710ddd0d | 2490 | struct scsi_cmnd *tmp, **prev; |
1fa6b5fb HR |
2491 | |
2492 | scmd_printk(KERN_WARNING, cmd, "aborting command\n"); | |
1da177e4 LT |
2493 | |
2494 | NCR5380_print_status(instance); | |
2495 | ||
52a6a1cb FT |
2496 | dprintk(NDEBUG_ABORT, "scsi%d : abort called\n", instance->host_no); |
2497 | dprintk(NDEBUG_ABORT, " basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG)); | |
1da177e4 LT |
2498 | |
2499 | #if 0 | |
2500 | /* | |
2501 | * Case 1 : If the command is the currently executing command, | |
2502 | * we'll set the aborted flag and return control so that | |
2503 | * information transfer routine can exit cleanly. | |
2504 | */ | |
2505 | ||
2506 | if (hostdata->connected == cmd) { | |
52a6a1cb | 2507 | dprintk(NDEBUG_ABORT, "scsi%d : aborting connected command\n", instance->host_no); |
1da177e4 LT |
2508 | /* |
2509 | * We should perform BSY checking, and make sure we haven't slipped | |
2510 | * into BUS FREE. | |
2511 | */ | |
2512 | ||
2513 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); | |
2514 | /* | |
2515 | * Since we can't change phases until we've completed the current | |
2516 | * handshake, we have to source or sink a byte of data if the current | |
2517 | * phase is not MSGOUT. | |
2518 | */ | |
2519 | ||
2520 | /* | |
2521 | * Return control to the executing NCR drive so we can clear the | |
2522 | * aborted flag and get back into our main loop. | |
2523 | */ | |
2524 | ||
b6c92b7e | 2525 | return SUCCESS; |
1da177e4 LT |
2526 | } |
2527 | #endif | |
2528 | ||
2529 | /* | |
2530 | * Case 2 : If the command hasn't been issued yet, we simply remove it | |
2531 | * from the issue queue. | |
2532 | */ | |
2533 | ||
52a6a1cb | 2534 | dprintk(NDEBUG_ABORT, "scsi%d : abort going into loop.\n", instance->host_no); |
710ddd0d | 2535 | for (prev = (struct scsi_cmnd **) &(hostdata->issue_queue), tmp = (struct scsi_cmnd *) hostdata->issue_queue; tmp; prev = (struct scsi_cmnd **) &(tmp->host_scribble), tmp = (struct scsi_cmnd *) tmp->host_scribble) |
1da177e4 LT |
2536 | if (cmd == tmp) { |
2537 | REMOVE(5, *prev, tmp, tmp->host_scribble); | |
710ddd0d | 2538 | (*prev) = (struct scsi_cmnd *) tmp->host_scribble; |
1da177e4 LT |
2539 | tmp->host_scribble = NULL; |
2540 | tmp->result = DID_ABORT << 16; | |
52a6a1cb | 2541 | dprintk(NDEBUG_ABORT, "scsi%d : abort removed command from issue queue.\n", instance->host_no); |
cce99c69 | 2542 | tmp->scsi_done(tmp); |
1da177e4 LT |
2543 | return SUCCESS; |
2544 | } | |
2545 | #if (NDEBUG & NDEBUG_ABORT) | |
2546 | /* KLL */ | |
2547 | else if (prev == tmp) | |
2548 | printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no); | |
2549 | #endif | |
2550 | ||
2551 | /* | |
2552 | * Case 3 : If any commands are connected, we're going to fail the abort | |
2553 | * and let the high level SCSI driver retry at a later time or | |
2554 | * issue a reset. | |
2555 | * | |
2556 | * Timeouts, and therefore aborted commands, will be highly unlikely | |
2557 | * and handling them cleanly in this situation would make the common | |
2558 | * case of noresets less efficient, and would pollute our code. So, | |
2559 | * we fail. | |
2560 | */ | |
2561 | ||
2562 | if (hostdata->connected) { | |
52a6a1cb | 2563 | dprintk(NDEBUG_ABORT, "scsi%d : abort failed, command connected.\n", instance->host_no); |
1da177e4 LT |
2564 | return FAILED; |
2565 | } | |
2566 | /* | |
2567 | * Case 4: If the command is currently disconnected from the bus, and | |
2568 | * there are no connected commands, we reconnect the I_T_L or | |
2569 | * I_T_L_Q nexus associated with it, go into message out, and send | |
2570 | * an abort message. | |
2571 | * | |
2572 | * This case is especially ugly. In order to reestablish the nexus, we | |
2573 | * need to call NCR5380_select(). The easiest way to implement this | |
2574 | * function was to abort if the bus was busy, and let the interrupt | |
2575 | * handler triggered on the SEL for reselect take care of lost arbitrations | |
2576 | * where necessary, meaning interrupts need to be enabled. | |
2577 | * | |
2578 | * When interrupts are enabled, the queues may change - so we | |
2579 | * can't remove it from the disconnected queue before selecting it | |
2580 | * because that could cause a failure in hashing the nexus if that | |
2581 | * device reselected. | |
2582 | * | |
2583 | * Since the queues may change, we can't use the pointers from when we | |
2584 | * first locate it. | |
2585 | * | |
2586 | * So, we must first locate the command, and if NCR5380_select() | |
2587 | * succeeds, then issue the abort, relocate the command and remove | |
2588 | * it from the disconnected queue. | |
2589 | */ | |
2590 | ||
710ddd0d | 2591 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp; tmp = (struct scsi_cmnd *) tmp->host_scribble) |
1da177e4 | 2592 | if (cmd == tmp) { |
52a6a1cb | 2593 | dprintk(NDEBUG_ABORT, "scsi%d : aborting disconnected command.\n", instance->host_no); |
1da177e4 | 2594 | |
76f13b93 | 2595 | if (NCR5380_select(instance, cmd)) |
1da177e4 | 2596 | return FAILED; |
52a6a1cb | 2597 | dprintk(NDEBUG_ABORT, "scsi%d : nexus reestablished.\n", instance->host_no); |
1da177e4 LT |
2598 | |
2599 | do_abort(instance); | |
2600 | ||
710ddd0d | 2601 | for (prev = (struct scsi_cmnd **) &(hostdata->disconnected_queue), tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp; prev = (struct scsi_cmnd **) &(tmp->host_scribble), tmp = (struct scsi_cmnd *) tmp->host_scribble) |
1da177e4 LT |
2602 | if (cmd == tmp) { |
2603 | REMOVE(5, *prev, tmp, tmp->host_scribble); | |
710ddd0d | 2604 | *prev = (struct scsi_cmnd *) tmp->host_scribble; |
1da177e4 LT |
2605 | tmp->host_scribble = NULL; |
2606 | tmp->result = DID_ABORT << 16; | |
cce99c69 | 2607 | tmp->scsi_done(tmp); |
1da177e4 LT |
2608 | return SUCCESS; |
2609 | } | |
2610 | } | |
2611 | /* | |
2612 | * Case 5 : If we reached this point, the command was not found in any of | |
2613 | * the queues. | |
2614 | * | |
2615 | * We probably reached this point because of an unlikely race condition | |
2616 | * between the command completing successfully and the abortion code, | |
2617 | * so we won't panic, but we will notify the user in case something really | |
2618 | * broke. | |
2619 | */ | |
2620 | printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n" | |
2621 | " before abortion\n", instance->host_no); | |
2622 | return FAILED; | |
2623 | } | |
2624 | ||
2625 | ||
3be1b3ea FT |
2626 | /** |
2627 | * NCR5380_bus_reset - reset the SCSI bus | |
2628 | * @cmd: SCSI command undergoing EH | |
1da177e4 | 2629 | * |
3be1b3ea | 2630 | * Returns SUCCESS |
1da177e4 LT |
2631 | */ |
2632 | ||
710ddd0d | 2633 | static int NCR5380_bus_reset(struct scsi_cmnd *cmd) |
68b3aa7c JG |
2634 | { |
2635 | struct Scsi_Host *instance = cmd->device->host; | |
2636 | ||
3be1b3ea FT |
2637 | spin_lock_irq(instance->host_lock); |
2638 | ||
2639 | #if (NDEBUG & NDEBUG_ANY) | |
2640 | scmd_printk(KERN_INFO, cmd, "performing bus reset\n"); | |
68b3aa7c | 2641 | NCR5380_print_status(instance); |
3be1b3ea | 2642 | #endif |
68b3aa7c | 2643 | |
68b3aa7c | 2644 | do_reset(instance); |
3be1b3ea | 2645 | |
68b3aa7c | 2646 | spin_unlock_irq(instance->host_lock); |
1da177e4 | 2647 | |
1da177e4 LT |
2648 | return SUCCESS; |
2649 | } |