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Commit | Line | Data |
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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) | |
1da177e4 | 81 | */ |
db9dff36 | 82 | #include <scsi/scsi_dbg.h> |
1abfd370 | 83 | #include <scsi/scsi_transport_spi.h> |
1da177e4 LT |
84 | |
85 | #if (NDEBUG & NDEBUG_LISTS) | |
86 | #define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); } | |
87 | #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); } | |
88 | #else | |
89 | #define LIST(x,y) | |
90 | #define REMOVE(w,x,y,z) | |
91 | #endif | |
92 | ||
93 | #ifndef notyet | |
1da177e4 LT |
94 | #undef REAL_DMA |
95 | #endif | |
96 | ||
1da177e4 LT |
97 | #ifdef BOARD_REQUIRES_NO_DELAY |
98 | #define io_recovery_delay(x) | |
99 | #else | |
100 | #define io_recovery_delay(x) udelay(x) | |
101 | #endif | |
102 | ||
103 | /* | |
104 | * Design | |
105 | * | |
106 | * This is a generic 5380 driver. To use it on a different platform, | |
107 | * one simply writes appropriate system specific macros (ie, data | |
108 | * transfer - some PC's will use the I/O bus, 68K's must use | |
109 | * memory mapped) and drops this file in their 'C' wrapper. | |
110 | * | |
111 | * (Note from hch: unfortunately it was not enough for the different | |
112 | * m68k folks and instead of improving this driver they copied it | |
113 | * and hacked it up for their needs. As a consequence they lost | |
114 | * most updates to this driver. Maybe someone will fix all these | |
115 | * drivers to use a common core one day..) | |
116 | * | |
117 | * As far as command queueing, two queues are maintained for | |
118 | * each 5380 in the system - commands that haven't been issued yet, | |
119 | * and commands that are currently executing. This means that an | |
120 | * unlimited number of commands may be queued, letting | |
121 | * more commands propagate from the higher driver levels giving higher | |
122 | * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, | |
123 | * allowing multiple commands to propagate all the way to a SCSI-II device | |
124 | * while a command is already executing. | |
125 | * | |
126 | * | |
127 | * Issues specific to the NCR5380 : | |
128 | * | |
129 | * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead | |
130 | * piece of hardware that requires you to sit in a loop polling for | |
131 | * the REQ signal as long as you are connected. Some devices are | |
132 | * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect | |
686f3990 | 133 | * while doing long seek operations. [...] These |
1da177e4 LT |
134 | * broken devices are the exception rather than the rule and I'd rather |
135 | * spend my time optimizing for the normal case. | |
136 | * | |
137 | * Architecture : | |
138 | * | |
139 | * At the heart of the design is a coroutine, NCR5380_main, | |
140 | * which is started from a workqueue for each NCR5380 host in the | |
141 | * system. It attempts to establish I_T_L or I_T_L_Q nexuses by | |
142 | * removing the commands from the issue queue and calling | |
143 | * NCR5380_select() if a nexus is not established. | |
144 | * | |
145 | * Once a nexus is established, the NCR5380_information_transfer() | |
146 | * phase goes through the various phases as instructed by the target. | |
147 | * if the target goes into MSG IN and sends a DISCONNECT message, | |
148 | * the command structure is placed into the per instance disconnected | |
149 | * queue, and NCR5380_main tries to find more work. If the target is | |
150 | * idle for too long, the system will try to sleep. | |
151 | * | |
152 | * If a command has disconnected, eventually an interrupt will trigger, | |
153 | * calling NCR5380_intr() which will in turn call NCR5380_reselect | |
154 | * to reestablish a nexus. This will run main if necessary. | |
155 | * | |
156 | * On command termination, the done function will be called as | |
157 | * appropriate. | |
158 | * | |
159 | * SCSI pointers are maintained in the SCp field of SCSI command | |
160 | * structures, being initialized after the command is connected | |
161 | * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. | |
162 | * Note that in violation of the standard, an implicit SAVE POINTERS operation | |
163 | * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. | |
164 | */ | |
165 | ||
166 | /* | |
167 | * Using this file : | |
168 | * This file a skeleton Linux SCSI driver for the NCR 5380 series | |
169 | * of chips. To use it, you write an architecture specific functions | |
170 | * and macros and include this file in your driver. | |
171 | * | |
172 | * These macros control options : | |
173 | * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be | |
174 | * defined. | |
175 | * | |
176 | * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically | |
177 | * for commands that return with a CHECK CONDITION status. | |
178 | * | |
179 | * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential | |
180 | * transceivers. | |
181 | * | |
182 | * DONT_USE_INTR - if defined, never use interrupts, even if we probe or | |
183 | * override-configure an IRQ. | |
184 | * | |
1da177e4 LT |
185 | * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases. |
186 | * | |
187 | * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. | |
188 | * | |
189 | * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't | |
190 | * rely on phase mismatch and EOP interrupts to determine end | |
191 | * of phase. | |
192 | * | |
1da177e4 LT |
193 | * Defaults for these will be provided although the user may want to adjust |
194 | * these to allocate CPU resources to the SCSI driver or "real" code. | |
195 | * | |
1da177e4 | 196 | * These macros MUST be defined : |
1da177e4 LT |
197 | * |
198 | * NCR5380_read(register) - read from the specified register | |
199 | * | |
200 | * NCR5380_write(register, value) - write to the specific register | |
201 | * | |
202 | * NCR5380_implementation_fields - additional fields needed for this | |
203 | * specific implementation of the NCR5380 | |
204 | * | |
205 | * Either real DMA *or* pseudo DMA may be implemented | |
206 | * REAL functions : | |
207 | * NCR5380_REAL_DMA should be defined if real DMA is to be used. | |
208 | * Note that the DMA setup functions should return the number of bytes | |
209 | * that they were able to program the controller for. | |
210 | * | |
211 | * Also note that generic i386/PC versions of these macros are | |
212 | * available as NCR5380_i386_dma_write_setup, | |
213 | * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. | |
214 | * | |
215 | * NCR5380_dma_write_setup(instance, src, count) - initialize | |
216 | * NCR5380_dma_read_setup(instance, dst, count) - initialize | |
217 | * NCR5380_dma_residual(instance); - residual count | |
218 | * | |
219 | * PSEUDO functions : | |
220 | * NCR5380_pwrite(instance, src, count) | |
221 | * NCR5380_pread(instance, dst, count); | |
222 | * | |
223 | * The generic driver is initialized by calling NCR5380_init(instance), | |
224 | * after setting the appropriate host specific fields and ID. If the | |
225 | * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, | |
226 | * possible) function may be used. | |
227 | */ | |
228 | ||
54d8fe44 FT |
229 | static int do_abort(struct Scsi_Host *); |
230 | static void do_reset(struct Scsi_Host *); | |
1da177e4 LT |
231 | |
232 | /* | |
233 | * initialize_SCp - init the scsi pointer field | |
234 | * @cmd: command block to set up | |
235 | * | |
236 | * Set up the internal fields in the SCSI command. | |
237 | */ | |
238 | ||
710ddd0d | 239 | static inline void initialize_SCp(struct scsi_cmnd *cmd) |
1da177e4 LT |
240 | { |
241 | /* | |
242 | * Initialize the Scsi Pointer field so that all of the commands in the | |
243 | * various queues are valid. | |
244 | */ | |
245 | ||
9e0fe44d BH |
246 | if (scsi_bufflen(cmd)) { |
247 | cmd->SCp.buffer = scsi_sglist(cmd); | |
248 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; | |
45711f1a | 249 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
1da177e4 LT |
250 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
251 | } else { | |
252 | cmd->SCp.buffer = NULL; | |
253 | cmd->SCp.buffers_residual = 0; | |
9e0fe44d BH |
254 | cmd->SCp.ptr = NULL; |
255 | cmd->SCp.this_residual = 0; | |
1da177e4 LT |
256 | } |
257 | } | |
258 | ||
259 | /** | |
b32ade12 | 260 | * NCR5380_poll_politely2 - wait for two chip register values |
2f854b82 | 261 | * @instance: controller to poll |
b32ade12 FT |
262 | * @reg1: 5380 register to poll |
263 | * @bit1: Bitmask to check | |
264 | * @val1: Expected value | |
265 | * @reg2: Second 5380 register to poll | |
266 | * @bit2: Second bitmask to check | |
267 | * @val2: Second expected value | |
2f854b82 FT |
268 | * @wait: Time-out in jiffies |
269 | * | |
270 | * Polls the chip in a reasonably efficient manner waiting for an | |
271 | * event to occur. After a short quick poll we begin to yield the CPU | |
272 | * (if possible). In irq contexts the time-out is arbitrarily limited. | |
273 | * Callers may hold locks as long as they are held in irq mode. | |
274 | * | |
b32ade12 | 275 | * Returns 0 if either or both event(s) occurred otherwise -ETIMEDOUT. |
1da177e4 | 276 | */ |
2f854b82 | 277 | |
b32ade12 FT |
278 | static int NCR5380_poll_politely2(struct Scsi_Host *instance, |
279 | int reg1, int bit1, int val1, | |
280 | int reg2, int bit2, int val2, int wait) | |
1da177e4 | 281 | { |
2f854b82 FT |
282 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
283 | unsigned long deadline = jiffies + wait; | |
284 | unsigned long n; | |
285 | ||
286 | /* Busy-wait for up to 10 ms */ | |
287 | n = min(10000U, jiffies_to_usecs(wait)); | |
288 | n *= hostdata->accesses_per_ms; | |
b32ade12 | 289 | n /= 2000; |
2f854b82 | 290 | do { |
b32ade12 FT |
291 | if ((NCR5380_read(reg1) & bit1) == val1) |
292 | return 0; | |
293 | if ((NCR5380_read(reg2) & bit2) == val2) | |
1da177e4 LT |
294 | return 0; |
295 | cpu_relax(); | |
2f854b82 FT |
296 | } while (n--); |
297 | ||
298 | if (irqs_disabled() || in_interrupt()) | |
299 | return -ETIMEDOUT; | |
300 | ||
301 | /* Repeatedly sleep for 1 ms until deadline */ | |
302 | while (time_is_after_jiffies(deadline)) { | |
303 | schedule_timeout_uninterruptible(1); | |
b32ade12 FT |
304 | if ((NCR5380_read(reg1) & bit1) == val1) |
305 | return 0; | |
306 | if ((NCR5380_read(reg2) & bit2) == val2) | |
1da177e4 | 307 | return 0; |
1da177e4 | 308 | } |
2f854b82 | 309 | |
1da177e4 LT |
310 | return -ETIMEDOUT; |
311 | } | |
312 | ||
b32ade12 FT |
313 | static inline int NCR5380_poll_politely(struct Scsi_Host *instance, |
314 | int reg, int bit, int val, int wait) | |
315 | { | |
316 | return NCR5380_poll_politely2(instance, reg, bit, val, | |
317 | reg, bit, val, wait); | |
318 | } | |
319 | ||
1da177e4 LT |
320 | static struct { |
321 | unsigned char value; | |
322 | const char *name; | |
702809ce | 323 | } phases[] __maybe_unused = { |
1da177e4 LT |
324 | {PHASE_DATAOUT, "DATAOUT"}, |
325 | {PHASE_DATAIN, "DATAIN"}, | |
326 | {PHASE_CMDOUT, "CMDOUT"}, | |
327 | {PHASE_STATIN, "STATIN"}, | |
328 | {PHASE_MSGOUT, "MSGOUT"}, | |
329 | {PHASE_MSGIN, "MSGIN"}, | |
330 | {PHASE_UNKNOWN, "UNKNOWN"} | |
331 | }; | |
332 | ||
185a7a1c | 333 | #if NDEBUG |
1da177e4 LT |
334 | static struct { |
335 | unsigned char mask; | |
336 | const char *name; | |
337 | } signals[] = { | |
338 | {SR_DBP, "PARITY"}, | |
339 | {SR_RST, "RST"}, | |
340 | {SR_BSY, "BSY"}, | |
341 | {SR_REQ, "REQ"}, | |
342 | {SR_MSG, "MSG"}, | |
343 | {SR_CD, "CD"}, | |
344 | {SR_IO, "IO"}, | |
345 | {SR_SEL, "SEL"}, | |
346 | {0, NULL} | |
347 | }, | |
348 | basrs[] = { | |
349 | {BASR_ATN, "ATN"}, | |
350 | {BASR_ACK, "ACK"}, | |
351 | {0, NULL} | |
352 | }, | |
353 | icrs[] = { | |
354 | {ICR_ASSERT_RST, "ASSERT RST"}, | |
355 | {ICR_ASSERT_ACK, "ASSERT ACK"}, | |
356 | {ICR_ASSERT_BSY, "ASSERT BSY"}, | |
357 | {ICR_ASSERT_SEL, "ASSERT SEL"}, | |
358 | {ICR_ASSERT_ATN, "ASSERT ATN"}, | |
359 | {ICR_ASSERT_DATA, "ASSERT DATA"}, | |
360 | {0, NULL} | |
361 | }, | |
362 | mrs[] = { | |
363 | {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, | |
364 | {MR_TARGET, "MODE TARGET"}, | |
365 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, | |
366 | {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"}, | |
367 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, | |
368 | {MR_DMA_MODE, "MODE DMA"}, | |
369 | {MR_ARBITRATE, "MODE ARBITRATION"}, | |
370 | {0, NULL} | |
371 | }; | |
372 | ||
373 | /** | |
374 | * NCR5380_print - print scsi bus signals | |
375 | * @instance: adapter state to dump | |
376 | * | |
377 | * Print the SCSI bus signals for debugging purposes | |
378 | * | |
379 | * Locks: caller holds hostdata lock (not essential) | |
380 | */ | |
381 | ||
382 | static void NCR5380_print(struct Scsi_Host *instance) | |
383 | { | |
1da177e4 | 384 | unsigned char status, data, basr, mr, icr, i; |
1da177e4 LT |
385 | |
386 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
387 | status = NCR5380_read(STATUS_REG); | |
388 | mr = NCR5380_read(MODE_REG); | |
389 | icr = NCR5380_read(INITIATOR_COMMAND_REG); | |
390 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
391 | ||
392 | printk("STATUS_REG: %02x ", status); | |
393 | for (i = 0; signals[i].mask; ++i) | |
394 | if (status & signals[i].mask) | |
395 | printk(",%s", signals[i].name); | |
396 | printk("\nBASR: %02x ", basr); | |
397 | for (i = 0; basrs[i].mask; ++i) | |
398 | if (basr & basrs[i].mask) | |
399 | printk(",%s", basrs[i].name); | |
400 | printk("\nICR: %02x ", icr); | |
401 | for (i = 0; icrs[i].mask; ++i) | |
402 | if (icr & icrs[i].mask) | |
403 | printk(",%s", icrs[i].name); | |
404 | printk("\nMODE: %02x ", mr); | |
405 | for (i = 0; mrs[i].mask; ++i) | |
406 | if (mr & mrs[i].mask) | |
407 | printk(",%s", mrs[i].name); | |
408 | printk("\n"); | |
409 | } | |
410 | ||
411 | ||
412 | /* | |
413 | * NCR5380_print_phase - show SCSI phase | |
414 | * @instance: adapter to dump | |
415 | * | |
416 | * Print the current SCSI phase for debugging purposes | |
417 | * | |
418 | * Locks: none | |
419 | */ | |
420 | ||
421 | static void NCR5380_print_phase(struct Scsi_Host *instance) | |
422 | { | |
1da177e4 LT |
423 | unsigned char status; |
424 | int i; | |
1da177e4 LT |
425 | |
426 | status = NCR5380_read(STATUS_REG); | |
427 | if (!(status & SR_REQ)) | |
428 | printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no); | |
429 | else { | |
430 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i); | |
431 | printk("scsi%d : phase %s\n", instance->host_no, phases[i].name); | |
432 | } | |
433 | } | |
434 | #endif | |
435 | ||
1da177e4 | 436 | |
d5f7e65d | 437 | static int probe_irq __initdata; |
1da177e4 LT |
438 | |
439 | /** | |
440 | * probe_intr - helper for IRQ autoprobe | |
441 | * @irq: interrupt number | |
442 | * @dev_id: unused | |
443 | * @regs: unused | |
444 | * | |
445 | * Set a flag to indicate the IRQ in question was received. This is | |
446 | * used by the IRQ probe code. | |
447 | */ | |
448 | ||
7d12e780 | 449 | static irqreturn_t __init probe_intr(int irq, void *dev_id) |
1da177e4 LT |
450 | { |
451 | probe_irq = irq; | |
452 | return IRQ_HANDLED; | |
453 | } | |
454 | ||
455 | /** | |
456 | * NCR5380_probe_irq - find the IRQ of an NCR5380 | |
457 | * @instance: NCR5380 controller | |
458 | * @possible: bitmask of ISA IRQ lines | |
459 | * | |
460 | * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ | |
461 | * and then looking to see what interrupt actually turned up. | |
462 | * | |
463 | * Locks: none, irqs must be enabled on entry | |
464 | */ | |
465 | ||
702809ce AM |
466 | static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance, |
467 | int possible) | |
1da177e4 | 468 | { |
1da177e4 LT |
469 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
470 | unsigned long timeout; | |
471 | int trying_irqs, i, mask; | |
1da177e4 | 472 | |
22f5f10d | 473 | for (trying_irqs = 0, i = 1, mask = 2; i < 16; ++i, mask <<= 1) |
4909cc2b | 474 | if ((mask & possible) && (request_irq(i, &probe_intr, 0, "NCR-probe", NULL) == 0)) |
1da177e4 LT |
475 | trying_irqs |= mask; |
476 | ||
4e5a800c | 477 | timeout = jiffies + msecs_to_jiffies(250); |
22f5f10d | 478 | probe_irq = NO_IRQ; |
1da177e4 LT |
479 | |
480 | /* | |
481 | * A interrupt is triggered whenever BSY = false, SEL = true | |
482 | * and a bit set in the SELECT_ENABLE_REG is asserted on the | |
483 | * SCSI bus. | |
484 | * | |
485 | * Note that the bus is only driven when the phase control signals | |
486 | * (I/O, C/D, and MSG) match those in the TCR, so we must reset that | |
487 | * to zero. | |
488 | */ | |
489 | ||
490 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
491 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
492 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); | |
493 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL); | |
494 | ||
22f5f10d | 495 | while (probe_irq == NO_IRQ && time_before(jiffies, timeout)) |
a9a3047d | 496 | schedule_timeout_uninterruptible(1); |
1da177e4 LT |
497 | |
498 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
499 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
500 | ||
22f5f10d | 501 | for (i = 1, mask = 2; i < 16; ++i, mask <<= 1) |
1da177e4 LT |
502 | if (trying_irqs & mask) |
503 | free_irq(i, NULL); | |
504 | ||
505 | return probe_irq; | |
506 | } | |
507 | ||
508 | /** | |
8c32513b FT |
509 | * NCR58380_info - report driver and host information |
510 | * @instance: relevant scsi host instance | |
1da177e4 | 511 | * |
8c32513b | 512 | * For use as the host template info() handler. |
1da177e4 LT |
513 | * |
514 | * Locks: none | |
515 | */ | |
516 | ||
8c32513b | 517 | static const char *NCR5380_info(struct Scsi_Host *instance) |
1da177e4 | 518 | { |
8c32513b FT |
519 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
520 | ||
521 | return hostdata->info; | |
522 | } | |
523 | ||
524 | static void prepare_info(struct Scsi_Host *instance) | |
525 | { | |
526 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
527 | ||
528 | snprintf(hostdata->info, sizeof(hostdata->info), | |
529 | "%s, io_port 0x%lx, n_io_port %d, " | |
530 | "base 0x%lx, irq %d, " | |
531 | "can_queue %d, cmd_per_lun %d, " | |
532 | "sg_tablesize %d, this_id %d, " | |
9c3f0e2b | 533 | "flags { %s%s%s%s}, " |
8c32513b FT |
534 | "options { %s} ", |
535 | instance->hostt->name, instance->io_port, instance->n_io_port, | |
536 | instance->base, instance->irq, | |
537 | instance->can_queue, instance->cmd_per_lun, | |
538 | instance->sg_tablesize, instance->this_id, | |
55181be8 | 539 | hostdata->flags & FLAG_NO_DMA_FIXUP ? "NO_DMA_FIXUP " : "", |
8c32513b FT |
540 | hostdata->flags & FLAG_DTC3181E ? "DTC3181E " : "", |
541 | hostdata->flags & FLAG_NO_PSEUDO_DMA ? "NO_PSEUDO_DMA " : "", | |
9c3f0e2b | 542 | hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "", |
1da177e4 | 543 | #ifdef AUTOPROBE_IRQ |
8c32513b | 544 | "AUTOPROBE_IRQ " |
1da177e4 | 545 | #endif |
1da177e4 | 546 | #ifdef DIFFERENTIAL |
8c32513b | 547 | "DIFFERENTIAL " |
1da177e4 LT |
548 | #endif |
549 | #ifdef REAL_DMA | |
8c32513b | 550 | "REAL_DMA " |
1da177e4 LT |
551 | #endif |
552 | #ifdef REAL_DMA_POLL | |
8c32513b | 553 | "REAL_DMA_POLL " |
1da177e4 LT |
554 | #endif |
555 | #ifdef PARITY | |
8c32513b | 556 | "PARITY " |
1da177e4 LT |
557 | #endif |
558 | #ifdef PSEUDO_DMA | |
8c32513b | 559 | "PSEUDO_DMA " |
8c32513b FT |
560 | #endif |
561 | ""); | |
1da177e4 LT |
562 | } |
563 | ||
564 | /** | |
565 | * NCR5380_print_status - dump controller info | |
566 | * @instance: controller to dump | |
567 | * | |
568 | * Print commands in the various queues, called from NCR5380_abort | |
569 | * and NCR5380_debug to aid debugging. | |
570 | * | |
571 | * Locks: called functions disable irqs | |
572 | */ | |
573 | ||
3be1b3ea | 574 | static void __maybe_unused NCR5380_print_status(struct Scsi_Host *instance) |
1da177e4 LT |
575 | { |
576 | NCR5380_dprint(NDEBUG_ANY, instance); | |
577 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
578 | } | |
579 | ||
a9c2dc43 | 580 | #ifdef PSEUDO_DMA |
1da177e4 LT |
581 | /******************************************/ |
582 | /* | |
583 | * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED] | |
584 | * | |
585 | * *buffer: I/O buffer | |
586 | * **start: if inout == FALSE pointer into buffer where user read should start | |
587 | * offset: current offset | |
588 | * length: length of buffer | |
589 | * hostno: Scsi_Host host_no | |
590 | * inout: TRUE - user is writing; FALSE - user is reading | |
591 | * | |
592 | * Return the number of bytes read from or written | |
593 | */ | |
594 | ||
dd7ab71b AV |
595 | static int __maybe_unused NCR5380_write_info(struct Scsi_Host *instance, |
596 | char *buffer, int length) | |
597 | { | |
a9c2dc43 FT |
598 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
599 | ||
600 | hostdata->spin_max_r = 0; | |
601 | hostdata->spin_max_w = 0; | |
602 | return 0; | |
dd7ab71b | 603 | } |
a9c2dc43 | 604 | #endif |
dd7ab71b | 605 | |
1da177e4 | 606 | static |
710ddd0d | 607 | void lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, struct seq_file *m); |
1da177e4 | 608 | static |
dd7ab71b | 609 | void lprint_command(unsigned char *cmd, struct seq_file *m); |
1da177e4 | 610 | static |
dd7ab71b | 611 | void lprint_opcode(int opcode, struct seq_file *m); |
1da177e4 | 612 | |
dd7ab71b AV |
613 | static int __maybe_unused NCR5380_show_info(struct seq_file *m, |
614 | struct Scsi_Host *instance) | |
1da177e4 | 615 | { |
1da177e4 | 616 | struct NCR5380_hostdata *hostdata; |
710ddd0d | 617 | struct scsi_cmnd *ptr; |
1da177e4 LT |
618 | |
619 | hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
620 | ||
a9c2dc43 | 621 | #ifdef PSEUDO_DMA |
0c3de38f | 622 | seq_printf(m, "Highwater I/O busy spin counts: write %d, read %d\n", |
a9c2dc43 | 623 | hostdata->spin_max_w, hostdata->spin_max_r); |
1da177e4 LT |
624 | #endif |
625 | spin_lock_irq(instance->host_lock); | |
626 | if (!hostdata->connected) | |
0c3de38f | 627 | seq_printf(m, "scsi%d: no currently connected command\n", instance->host_no); |
1da177e4 | 628 | else |
710ddd0d | 629 | lprint_Scsi_Cmnd((struct scsi_cmnd *) hostdata->connected, m); |
0c3de38f | 630 | seq_printf(m, "scsi%d: issue_queue\n", instance->host_no); |
710ddd0d | 631 | for (ptr = (struct scsi_cmnd *) hostdata->issue_queue; ptr; ptr = (struct scsi_cmnd *) ptr->host_scribble) |
dd7ab71b | 632 | lprint_Scsi_Cmnd(ptr, m); |
1da177e4 | 633 | |
0c3de38f | 634 | seq_printf(m, "scsi%d: disconnected_queue\n", instance->host_no); |
710ddd0d | 635 | for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr; ptr = (struct scsi_cmnd *) ptr->host_scribble) |
dd7ab71b | 636 | lprint_Scsi_Cmnd(ptr, m); |
1da177e4 | 637 | spin_unlock_irq(instance->host_lock); |
dd7ab71b | 638 | return 0; |
1da177e4 LT |
639 | } |
640 | ||
710ddd0d | 641 | static void lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, struct seq_file *m) |
1da177e4 | 642 | { |
0c3de38f | 643 | seq_printf(m, "scsi%d : destination target %d, lun %llu\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun); |
91c40f24 | 644 | seq_puts(m, " command = "); |
dd7ab71b | 645 | lprint_command(cmd->cmnd, m); |
1da177e4 LT |
646 | } |
647 | ||
dd7ab71b | 648 | static void lprint_command(unsigned char *command, struct seq_file *m) |
1da177e4 LT |
649 | { |
650 | int i, s; | |
dd7ab71b | 651 | lprint_opcode(command[0], m); |
1da177e4 | 652 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) |
0c3de38f | 653 | seq_printf(m, "%02x ", command[i]); |
f50332ff | 654 | seq_putc(m, '\n'); |
1da177e4 LT |
655 | } |
656 | ||
dd7ab71b | 657 | static void lprint_opcode(int opcode, struct seq_file *m) |
1da177e4 | 658 | { |
0c3de38f | 659 | seq_printf(m, "%2d (0x%02x)", opcode, opcode); |
1da177e4 LT |
660 | } |
661 | ||
662 | ||
663 | /** | |
664 | * NCR5380_init - initialise an NCR5380 | |
665 | * @instance: adapter to configure | |
666 | * @flags: control flags | |
667 | * | |
668 | * Initializes *instance and corresponding 5380 chip, | |
669 | * with flags OR'd into the initial flags value. | |
670 | * | |
671 | * Notes : I assume that the host, hostno, and id bits have been | |
672 | * set correctly. I don't care about the irq and other fields. | |
673 | * | |
674 | * Returns 0 for success | |
675 | * | |
676 | * Locks: interrupts must be enabled when we are called | |
677 | */ | |
678 | ||
6f039790 | 679 | static int NCR5380_init(struct Scsi_Host *instance, int flags) |
1da177e4 | 680 | { |
b6488f97 | 681 | int i; |
1da177e4 | 682 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
2f854b82 | 683 | unsigned long deadline; |
1da177e4 LT |
684 | |
685 | if(in_interrupt()) | |
686 | printk(KERN_ERR "NCR5380_init called with interrupts off!\n"); | |
1da177e4 | 687 | |
1da177e4 LT |
688 | hostdata->id_mask = 1 << instance->this_id; |
689 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) | |
690 | if (i > hostdata->id_mask) | |
691 | hostdata->id_higher_mask |= i; | |
692 | for (i = 0; i < 8; ++i) | |
693 | hostdata->busy[i] = 0; | |
694 | #ifdef REAL_DMA | |
695 | hostdata->dmalen = 0; | |
696 | #endif | |
1da177e4 LT |
697 | hostdata->connected = NULL; |
698 | hostdata->issue_queue = NULL; | |
699 | hostdata->disconnected_queue = NULL; | |
55181be8 | 700 | hostdata->flags = flags; |
1da177e4 | 701 | |
8d8601a7 | 702 | INIT_WORK(&hostdata->main_task, NCR5380_main); |
0ad0eff9 FT |
703 | hostdata->work_q = alloc_workqueue("ncr5380_%d", |
704 | WQ_UNBOUND | WQ_MEM_RECLAIM, | |
705 | 1, instance->host_no); | |
706 | if (!hostdata->work_q) | |
707 | return -ENOMEM; | |
708 | ||
1da177e4 | 709 | hostdata->host = instance; |
1da177e4 | 710 | |
8c32513b FT |
711 | prepare_info(instance); |
712 | ||
1da177e4 LT |
713 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
714 | NCR5380_write(MODE_REG, MR_BASE); | |
715 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
716 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
2f854b82 FT |
717 | |
718 | /* Calibrate register polling loop */ | |
719 | i = 0; | |
720 | deadline = jiffies + 1; | |
721 | do { | |
722 | cpu_relax(); | |
723 | } while (time_is_after_jiffies(deadline)); | |
724 | deadline += msecs_to_jiffies(256); | |
725 | do { | |
726 | NCR5380_read(STATUS_REG); | |
727 | ++i; | |
728 | cpu_relax(); | |
729 | } while (time_is_after_jiffies(deadline)); | |
730 | hostdata->accesses_per_ms = i / 256; | |
731 | ||
b6488f97 FT |
732 | return 0; |
733 | } | |
1da177e4 | 734 | |
b6488f97 FT |
735 | /** |
736 | * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems. | |
737 | * @instance: adapter to check | |
738 | * | |
739 | * If the system crashed, it may have crashed with a connected target and | |
740 | * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the | |
741 | * currently established nexus, which we know nothing about. Failing that | |
742 | * do a bus reset. | |
743 | * | |
744 | * Note that a bus reset will cause the chip to assert IRQ. | |
745 | * | |
746 | * Returns 0 if successful, otherwise -ENXIO. | |
747 | */ | |
748 | ||
749 | static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance) | |
750 | { | |
9c3f0e2b | 751 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
b6488f97 | 752 | int pass; |
1da177e4 LT |
753 | |
754 | for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { | |
755 | switch (pass) { | |
756 | case 1: | |
757 | case 3: | |
758 | case 5: | |
636b1ec8 FT |
759 | shost_printk(KERN_ERR, instance, "SCSI bus busy, waiting up to five seconds\n"); |
760 | NCR5380_poll_politely(instance, | |
761 | STATUS_REG, SR_BSY, 0, 5 * HZ); | |
1da177e4 LT |
762 | break; |
763 | case 2: | |
636b1ec8 | 764 | shost_printk(KERN_ERR, instance, "bus busy, attempting abort\n"); |
1da177e4 LT |
765 | do_abort(instance); |
766 | break; | |
767 | case 4: | |
636b1ec8 | 768 | shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n"); |
1da177e4 | 769 | do_reset(instance); |
9c3f0e2b FT |
770 | /* Wait after a reset; the SCSI standard calls for |
771 | * 250ms, we wait 500ms to be on the safe side. | |
772 | * But some Toshiba CD-ROMs need ten times that. | |
773 | */ | |
774 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) | |
775 | msleep(2500); | |
776 | else | |
777 | msleep(500); | |
1da177e4 LT |
778 | break; |
779 | case 6: | |
636b1ec8 | 780 | shost_printk(KERN_ERR, instance, "bus locked solid\n"); |
1da177e4 LT |
781 | return -ENXIO; |
782 | } | |
783 | } | |
784 | return 0; | |
785 | } | |
786 | ||
787 | /** | |
788 | * NCR5380_exit - remove an NCR5380 | |
789 | * @instance: adapter to remove | |
790 | */ | |
791 | ||
a43cf0f3 | 792 | static void NCR5380_exit(struct Scsi_Host *instance) |
1da177e4 LT |
793 | { |
794 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
795 | ||
8d8601a7 | 796 | cancel_work_sync(&hostdata->main_task); |
0ad0eff9 | 797 | destroy_workqueue(hostdata->work_q); |
1da177e4 LT |
798 | } |
799 | ||
800 | /** | |
1bb40589 FT |
801 | * NCR5380_queue_command - queue a command |
802 | * @instance: the relevant SCSI adapter | |
803 | * @cmd: SCSI command | |
1da177e4 | 804 | * |
1bb40589 FT |
805 | * cmd is added to the per-instance issue queue, with minor |
806 | * twiddling done to the host specific fields of cmd. If the | |
807 | * main coroutine is not running, it is restarted. | |
1da177e4 LT |
808 | */ |
809 | ||
1bb40589 FT |
810 | static int NCR5380_queue_command(struct Scsi_Host *instance, |
811 | struct scsi_cmnd *cmd) | |
1da177e4 | 812 | { |
1bb40589 | 813 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
710ddd0d | 814 | struct scsi_cmnd *tmp; |
1bb40589 | 815 | unsigned long flags; |
1da177e4 LT |
816 | |
817 | #if (NDEBUG & NDEBUG_NO_WRITE) | |
818 | switch (cmd->cmnd[0]) { | |
819 | case WRITE_6: | |
820 | case WRITE_10: | |
821 | printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no); | |
822 | cmd->result = (DID_ERROR << 16); | |
1bb40589 | 823 | cmd->scsi_done(cmd); |
1da177e4 LT |
824 | return 0; |
825 | } | |
826 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ | |
827 | ||
1da177e4 LT |
828 | /* |
829 | * We use the host_scribble field as a pointer to the next command | |
830 | * in a queue | |
831 | */ | |
832 | ||
833 | cmd->host_scribble = NULL; | |
1da177e4 LT |
834 | cmd->result = 0; |
835 | ||
1bb40589 FT |
836 | spin_lock_irqsave(instance->host_lock, flags); |
837 | ||
1da177e4 LT |
838 | /* |
839 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
840 | * commands are added to the head of the queue since any command will | |
841 | * clear the contingent allegiance condition that exists and the | |
842 | * sense data is only guaranteed to be valid while the condition exists. | |
843 | */ | |
844 | ||
845 | if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { | |
846 | LIST(cmd, hostdata->issue_queue); | |
847 | cmd->host_scribble = (unsigned char *) hostdata->issue_queue; | |
848 | hostdata->issue_queue = cmd; | |
849 | } else { | |
710ddd0d | 850 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (struct scsi_cmnd *) tmp->host_scribble); |
1da177e4 LT |
851 | LIST(cmd, tmp); |
852 | tmp->host_scribble = (unsigned char *) cmd; | |
853 | } | |
1bb40589 FT |
854 | spin_unlock_irqrestore(instance->host_lock, flags); |
855 | ||
52a6a1cb | 856 | dprintk(NDEBUG_QUEUES, "scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); |
1da177e4 | 857 | |
1da177e4 | 858 | /* Kick off command processing */ |
8d8601a7 | 859 | queue_work(hostdata->work_q, &hostdata->main_task); |
1da177e4 LT |
860 | return 0; |
861 | } | |
862 | ||
1da177e4 LT |
863 | /** |
864 | * NCR5380_main - NCR state machines | |
865 | * | |
866 | * NCR5380_main is a coroutine that runs as long as more work can | |
867 | * be done on the NCR5380 host adapters in a system. Both | |
868 | * NCR5380_queue_command() and NCR5380_intr() will try to start it | |
869 | * in case it is not running. | |
870 | * | |
871 | * Locks: called as its own thread with no locks held. Takes the | |
872 | * host lock and called routines may take the isa dma lock. | |
873 | */ | |
874 | ||
c4028958 | 875 | static void NCR5380_main(struct work_struct *work) |
1da177e4 | 876 | { |
c4028958 | 877 | struct NCR5380_hostdata *hostdata = |
8d8601a7 | 878 | container_of(work, struct NCR5380_hostdata, main_task); |
1da177e4 | 879 | struct Scsi_Host *instance = hostdata->host; |
710ddd0d | 880 | struct scsi_cmnd *tmp, *prev; |
1da177e4 LT |
881 | int done; |
882 | ||
883 | spin_lock_irq(instance->host_lock); | |
884 | do { | |
885 | /* Lock held here */ | |
886 | done = 1; | |
ae753a33 | 887 | if (!hostdata->connected) { |
52a6a1cb | 888 | dprintk(NDEBUG_MAIN, "scsi%d : not connected\n", instance->host_no); |
1da177e4 LT |
889 | /* |
890 | * Search through the issue_queue for a command destined | |
891 | * for a target that's not busy. | |
892 | */ | |
710ddd0d | 893 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (struct scsi_cmnd *) tmp->host_scribble) |
1da177e4 LT |
894 | { |
895 | if (prev != tmp) | |
9cb78c16 | 896 | 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 | 897 | /* When we find one, remove it from the issue queue. */ |
9cb78c16 HR |
898 | if (!(hostdata->busy[tmp->device->id] & |
899 | (1 << (u8)(tmp->device->lun & 0xff)))) { | |
1da177e4 LT |
900 | if (prev) { |
901 | REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); | |
902 | prev->host_scribble = tmp->host_scribble; | |
903 | } else { | |
904 | REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble); | |
710ddd0d | 905 | hostdata->issue_queue = (struct scsi_cmnd *) tmp->host_scribble; |
1da177e4 LT |
906 | } |
907 | tmp->host_scribble = NULL; | |
908 | ||
909 | /* | |
910 | * Attempt to establish an I_T_L nexus here. | |
911 | * On success, instance->hostdata->connected is set. | |
912 | * On failure, we must add the command back to the | |
913 | * issue queue so we can keep trying. | |
914 | */ | |
9cb78c16 | 915 | 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 | 916 | |
76f13b93 FT |
917 | /* |
918 | * REQUEST SENSE commands are issued without tagged | |
919 | * queueing, even on SCSI-II devices because the | |
920 | * contingent allegiance condition exists for the | |
921 | * entire unit. | |
922 | */ | |
923 | ||
924 | if (!NCR5380_select(instance, tmp)) { | |
1f1b0c74 | 925 | /* OK or bad target */ |
1da177e4 | 926 | } else { |
1f1b0c74 | 927 | /* Need to retry */ |
1da177e4 LT |
928 | LIST(tmp, hostdata->issue_queue); |
929 | tmp->host_scribble = (unsigned char *) hostdata->issue_queue; | |
930 | hostdata->issue_queue = tmp; | |
931 | done = 0; | |
52a6a1cb | 932 | dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, "scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no); |
1da177e4 | 933 | } |
ae753a33 | 934 | if (hostdata->connected) |
1f1b0c74 | 935 | break; |
1da177e4 LT |
936 | /* lock held here still */ |
937 | } /* if target/lun is not busy */ | |
938 | } /* for */ | |
939 | /* exited locked */ | |
940 | } /* if (!hostdata->connected) */ | |
1da177e4 LT |
941 | if (hostdata->connected |
942 | #ifdef REAL_DMA | |
943 | && !hostdata->dmalen | |
944 | #endif | |
1da177e4 | 945 | ) { |
52a6a1cb | 946 | dprintk(NDEBUG_MAIN, "scsi%d : main() : performing information transfer\n", instance->host_no); |
1da177e4 | 947 | NCR5380_information_transfer(instance); |
52a6a1cb | 948 | dprintk(NDEBUG_MAIN, "scsi%d : main() : done set false\n", instance->host_no); |
1da177e4 | 949 | done = 0; |
1d3db59d | 950 | } |
1da177e4 LT |
951 | } while (!done); |
952 | ||
953 | spin_unlock_irq(instance->host_lock); | |
954 | } | |
955 | ||
956 | #ifndef DONT_USE_INTR | |
957 | ||
958 | /** | |
cd400825 FT |
959 | * NCR5380_intr - generic NCR5380 irq handler |
960 | * @irq: interrupt number | |
961 | * @dev_id: device info | |
962 | * | |
963 | * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses | |
964 | * from the disconnected queue, and restarting NCR5380_main() | |
965 | * as required. | |
966 | * | |
967 | * The chip can assert IRQ in any of six different conditions. The IRQ flag | |
968 | * is then cleared by reading the Reset Parity/Interrupt Register (RPIR). | |
969 | * Three of these six conditions are latched in the Bus and Status Register: | |
970 | * - End of DMA (cleared by ending DMA Mode) | |
971 | * - Parity error (cleared by reading RPIR) | |
972 | * - Loss of BSY (cleared by reading RPIR) | |
973 | * Two conditions have flag bits that are not latched: | |
974 | * - Bus phase mismatch (non-maskable in DMA Mode, cleared by ending DMA Mode) | |
975 | * - Bus reset (non-maskable) | |
976 | * The remaining condition has no flag bit at all: | |
977 | * - Selection/reselection | |
978 | * | |
979 | * Hence, establishing the cause(s) of any interrupt is partly guesswork. | |
980 | * In "The DP8490 and DP5380 Comparison Guide", National Semiconductor | |
981 | * claimed that "the design of the [DP8490] interrupt logic ensures | |
982 | * interrupts will not be lost (they can be on the DP5380)." | |
983 | * The L5380/53C80 datasheet from LOGIC Devices has more details. | |
984 | * | |
985 | * Checking for bus reset by reading RST is futile because of interrupt | |
986 | * latency, but a bus reset will reset chip logic. Checking for parity error | |
987 | * is unnecessary because that interrupt is never enabled. A Loss of BSY | |
988 | * condition will clear DMA Mode. We can tell when this occurs because the | |
989 | * the Busy Monitor interrupt is enabled together with DMA Mode. | |
1da177e4 LT |
990 | */ |
991 | ||
cd400825 | 992 | static irqreturn_t NCR5380_intr(int irq, void *dev_id) |
1da177e4 | 993 | { |
baa9aac6 | 994 | struct Scsi_Host *instance = dev_id; |
cd400825 FT |
995 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
996 | int handled = 0; | |
1da177e4 LT |
997 | unsigned char basr; |
998 | unsigned long flags; | |
999 | ||
cd400825 FT |
1000 | spin_lock_irqsave(instance->host_lock, flags); |
1001 | ||
1002 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
1003 | if (basr & BASR_IRQ) { | |
1004 | unsigned char mr = NCR5380_read(MODE_REG); | |
1005 | unsigned char sr = NCR5380_read(STATUS_REG); | |
1006 | ||
1007 | dprintk(NDEBUG_INTR, "scsi%d: IRQ %d, BASR 0x%02x, SR 0x%02x, MR 0x%02x\n", | |
1008 | instance->host_no, irq, basr, sr, mr); | |
1da177e4 | 1009 | |
1da177e4 | 1010 | #if defined(REAL_DMA) |
cd400825 FT |
1011 | if ((mr & MR_DMA_MODE) || (mr & MR_MONITOR_BSY)) { |
1012 | /* Probably End of DMA, Phase Mismatch or Loss of BSY. | |
1013 | * We ack IRQ after clearing Mode Register. Workarounds | |
1014 | * for End of DMA errata need to happen in DMA Mode. | |
1015 | */ | |
1da177e4 | 1016 | |
cd400825 | 1017 | dprintk(NDEBUG_INTR, "scsi%d: interrupt in DMA mode\n", intance->host_no); |
1da177e4 | 1018 | |
cd400825 | 1019 | int transferred; |
1da177e4 | 1020 | |
cd400825 FT |
1021 | if (!hostdata->connected) |
1022 | panic("scsi%d : DMA interrupt with no connected cmd\n", | |
1023 | instance->hostno); | |
1da177e4 | 1024 | |
cd400825 FT |
1025 | transferred = hostdata->dmalen - NCR5380_dma_residual(instance); |
1026 | hostdata->connected->SCp.this_residual -= transferred; | |
1027 | hostdata->connected->SCp.ptr += transferred; | |
1028 | hostdata->dmalen = 0; | |
1da177e4 | 1029 | |
cd400825 FT |
1030 | /* FIXME: we need to poll briefly then defer a workqueue task ! */ |
1031 | NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2 * HZ); | |
1032 | ||
1033 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1034 | NCR5380_write(MODE_REG, MR_BASE); | |
1035 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1036 | } else | |
1037 | #endif /* REAL_DMA */ | |
1038 | if ((NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_mask) && | |
1039 | (sr & (SR_SEL | SR_IO | SR_BSY | SR_RST)) == (SR_SEL | SR_IO)) { | |
1040 | /* Probably reselected */ | |
1041 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1042 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1043 | ||
1044 | dprintk(NDEBUG_INTR, "scsi%d: interrupt with SEL and IO\n", | |
1045 | instance->host_no); | |
1046 | ||
1047 | if (!hostdata->connected) { | |
1048 | NCR5380_reselect(instance); | |
1049 | queue_work(hostdata->work_q, &hostdata->main_task); | |
1da177e4 | 1050 | } |
cd400825 FT |
1051 | if (!hostdata->connected) |
1052 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1053 | } else { | |
1054 | /* Probably Bus Reset */ | |
1055 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1056 | ||
1057 | dprintk(NDEBUG_INTR, "scsi%d: unknown interrupt\n", instance->host_no); | |
1058 | } | |
1059 | handled = 1; | |
1060 | } else { | |
1061 | shost_printk(KERN_NOTICE, instance, "interrupt without IRQ bit\n"); | |
1062 | } | |
1063 | ||
1064 | spin_unlock_irqrestore(instance->host_lock, flags); | |
1065 | ||
1066 | return IRQ_RETVAL(handled); | |
1da177e4 LT |
1067 | } |
1068 | ||
1069 | #endif | |
1070 | ||
1da177e4 | 1071 | /* |
710ddd0d FT |
1072 | * Function : int NCR5380_select(struct Scsi_Host *instance, |
1073 | * struct scsi_cmnd *cmd) | |
1da177e4 LT |
1074 | * |
1075 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, | |
1076 | * including ARBITRATION, SELECTION, and initial message out for | |
1077 | * IDENTIFY and queue messages. | |
1078 | * | |
1079 | * Inputs : instance - instantiation of the 5380 driver on which this | |
76f13b93 | 1080 | * target lives, cmd - SCSI command to execute. |
1da177e4 | 1081 | * |
6323876f FT |
1082 | * Returns : -1 if selection failed but should be retried. |
1083 | * 0 if selection failed and should not be retried. | |
1084 | * 0 if selection succeeded completely (hostdata->connected == cmd). | |
1da177e4 LT |
1085 | * |
1086 | * Side effects : | |
1087 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit | |
1088 | * with registers as they should have been on entry - ie | |
1089 | * SELECT_ENABLE will be set appropriately, the NCR5380 | |
1090 | * will cease to drive any SCSI bus signals. | |
1091 | * | |
1092 | * If successful : I_T_L or I_T_L_Q nexus will be established, | |
1093 | * instance->connected will be set to cmd. | |
1094 | * SELECT interrupt will be disabled. | |
1095 | * | |
1096 | * If failed (no target) : cmd->scsi_done() will be called, and the | |
1097 | * cmd->result host byte set to DID_BAD_TARGET. | |
1098 | * | |
1099 | * Locks: caller holds hostdata lock in IRQ mode | |
1100 | */ | |
1101 | ||
710ddd0d | 1102 | static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd) |
1da177e4 | 1103 | { |
1da177e4 LT |
1104 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
1105 | unsigned char tmp[3], phase; | |
1106 | unsigned char *data; | |
1107 | int len; | |
1da177e4 | 1108 | int err; |
1da177e4 | 1109 | |
1da177e4 | 1110 | NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
52a6a1cb | 1111 | dprintk(NDEBUG_ARBITRATION, "scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id); |
1da177e4 LT |
1112 | |
1113 | /* | |
1114 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the | |
1115 | * data bus during SELECTION. | |
1116 | */ | |
1117 | ||
1118 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
1119 | ||
1120 | /* | |
1121 | * Start arbitration. | |
1122 | */ | |
1123 | ||
1124 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); | |
1125 | NCR5380_write(MODE_REG, MR_ARBITRATE); | |
1126 | ||
55500d9b FT |
1127 | /* The chip now waits for BUS FREE phase. Then after the 800 ns |
1128 | * Bus Free Delay, arbitration will begin. | |
1129 | */ | |
1da177e4 | 1130 | |
1da177e4 | 1131 | spin_unlock_irq(instance->host_lock); |
b32ade12 FT |
1132 | err = NCR5380_poll_politely2(instance, MODE_REG, MR_ARBITRATE, 0, |
1133 | INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, | |
1134 | ICR_ARBITRATION_PROGRESS, HZ); | |
1135 | spin_lock_irq(instance->host_lock); | |
1136 | if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) { | |
1137 | /* Reselection interrupt */ | |
1138 | return -1; | |
1139 | } | |
1140 | if (err < 0) { | |
1141 | NCR5380_write(MODE_REG, MR_BASE); | |
1142 | shost_printk(KERN_ERR, instance, | |
1143 | "select: arbitration timeout\n"); | |
1144 | return -1; | |
1da177e4 LT |
1145 | } |
1146 | ||
55500d9b | 1147 | /* The SCSI-2 arbitration delay is 2.4 us */ |
1da177e4 LT |
1148 | udelay(3); |
1149 | ||
1150 | /* Check for lost arbitration */ | |
1151 | 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)) { | |
1152 | NCR5380_write(MODE_REG, MR_BASE); | |
52a6a1cb | 1153 | dprintk(NDEBUG_ARBITRATION, "scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no); |
6323876f | 1154 | return -1; |
1da177e4 | 1155 | } |
cf13b083 FT |
1156 | |
1157 | /* After/during arbitration, BSY should be asserted. | |
1158 | * IBM DPES-31080 Version S31Q works now | |
1159 | * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) | |
1160 | */ | |
1161 | NCR5380_write(INITIATOR_COMMAND_REG, | |
1162 | ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY); | |
1da177e4 LT |
1163 | |
1164 | if (!(hostdata->flags & FLAG_DTC3181E) && | |
1165 | /* RvC: DTC3181E has some trouble with this | |
1166 | * so we simply removed it. Seems to work with | |
1167 | * only Mustek scanner attached | |
1168 | */ | |
1169 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { | |
1170 | NCR5380_write(MODE_REG, MR_BASE); | |
1171 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
52a6a1cb | 1172 | dprintk(NDEBUG_ARBITRATION, "scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no); |
6323876f | 1173 | return -1; |
1da177e4 LT |
1174 | } |
1175 | /* | |
1176 | * Again, bus clear + bus settle time is 1.2us, however, this is | |
1177 | * a minimum so we'll udelay ceil(1.2) | |
1178 | */ | |
1179 | ||
9c3f0e2b FT |
1180 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) |
1181 | udelay(15); | |
1182 | else | |
1183 | udelay(2); | |
1da177e4 | 1184 | |
52a6a1cb | 1185 | dprintk(NDEBUG_ARBITRATION, "scsi%d : won arbitration\n", instance->host_no); |
1da177e4 LT |
1186 | |
1187 | /* | |
1188 | * Now that we have won arbitration, start Selection process, asserting | |
1189 | * the host and target ID's on the SCSI bus. | |
1190 | */ | |
1191 | ||
422c0d61 | 1192 | NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd)))); |
1da177e4 LT |
1193 | |
1194 | /* | |
1195 | * Raise ATN while SEL is true before BSY goes false from arbitration, | |
1196 | * since this is the only way to guarantee that we'll get a MESSAGE OUT | |
1197 | * phase immediately after selection. | |
1198 | */ | |
1199 | ||
1200 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); | |
1201 | NCR5380_write(MODE_REG, MR_BASE); | |
1202 | ||
1203 | /* | |
1204 | * Reselect interrupts must be turned off prior to the dropping of BSY, | |
1205 | * otherwise we will trigger an interrupt. | |
1206 | */ | |
1207 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1208 | ||
1209 | /* | |
1210 | * The initiator shall then wait at least two deskew delays and release | |
1211 | * the BSY signal. | |
1212 | */ | |
1213 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ | |
1214 | ||
1215 | /* Reset BSY */ | |
1216 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); | |
1217 | ||
1218 | /* | |
1219 | * Something weird happens when we cease to drive BSY - looks | |
1220 | * like the board/chip is letting us do another read before the | |
1221 | * appropriate propagation delay has expired, and we're confusing | |
1222 | * a BSY signal from ourselves as the target's response to SELECTION. | |
1223 | * | |
1224 | * A small delay (the 'C++' frontend breaks the pipeline with an | |
1225 | * unnecessary jump, making it work on my 386-33/Trantor T128, the | |
1226 | * tighter 'C' code breaks and requires this) solves the problem - | |
1227 | * the 1 us delay is arbitrary, and only used because this delay will | |
1228 | * be the same on other platforms and since it works here, it should | |
1229 | * work there. | |
1230 | * | |
1231 | * wingel suggests that this could be due to failing to wait | |
1232 | * one deskew delay. | |
1233 | */ | |
1234 | ||
1235 | udelay(1); | |
1236 | ||
52a6a1cb | 1237 | dprintk(NDEBUG_SELECTION, "scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd)); |
1da177e4 LT |
1238 | |
1239 | /* | |
1240 | * The SCSI specification calls for a 250 ms timeout for the actual | |
1241 | * selection. | |
1242 | */ | |
1243 | ||
ae753a33 FT |
1244 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, SR_BSY, |
1245 | msecs_to_jiffies(250)); | |
1da177e4 | 1246 | |
1da177e4 LT |
1247 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { |
1248 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1249 | NCR5380_reselect(instance); | |
cd400825 FT |
1250 | if (!hostdata->connected) |
1251 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1da177e4 | 1252 | printk("scsi%d : reselection after won arbitration?\n", instance->host_no); |
1da177e4 LT |
1253 | return -1; |
1254 | } | |
ae753a33 FT |
1255 | |
1256 | if (err < 0) { | |
1257 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1258 | cmd->result = DID_BAD_TARGET << 16; | |
1259 | cmd->scsi_done(cmd); | |
1260 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1261 | dprintk(NDEBUG_SELECTION, "scsi%d : target did not respond within 250ms\n", | |
1262 | instance->host_no); | |
1263 | return 0; | |
1264 | } | |
1265 | ||
1da177e4 LT |
1266 | /* |
1267 | * No less than two deskew delays after the initiator detects the | |
1268 | * BSY signal is true, it shall release the SEL signal and may | |
1269 | * change the DATA BUS. -wingel | |
1270 | */ | |
1271 | ||
1272 | udelay(1); | |
1273 | ||
1274 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1275 | ||
1da177e4 LT |
1276 | /* |
1277 | * Since we followed the SCSI spec, and raised ATN while SEL | |
1278 | * was true but before BSY was false during selection, the information | |
1279 | * transfer phase should be a MESSAGE OUT phase so that we can send the | |
1280 | * IDENTIFY message. | |
1281 | * | |
1282 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG | |
1283 | * message (2 bytes) with a tag ID that we increment with every command | |
1284 | * until it wraps back to 0. | |
1285 | * | |
1286 | * XXX - it turns out that there are some broken SCSI-II devices, | |
1287 | * which claim to support tagged queuing but fail when more than | |
1288 | * some number of commands are issued at once. | |
1289 | */ | |
1290 | ||
1291 | /* Wait for start of REQ/ACK handshake */ | |
1292 | ||
1293 | spin_unlock_irq(instance->host_lock); | |
1294 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); | |
1295 | spin_lock_irq(instance->host_lock); | |
1cc160e1 | 1296 | if (err < 0) { |
55500d9b FT |
1297 | shost_printk(KERN_ERR, instance, "select: REQ timeout\n"); |
1298 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1da177e4 | 1299 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
6323876f | 1300 | return -1; |
1da177e4 LT |
1301 | } |
1302 | ||
52a6a1cb | 1303 | dprintk(NDEBUG_SELECTION, "scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id); |
22f5f10d | 1304 | tmp[0] = IDENTIFY(((instance->irq == NO_IRQ) ? 0 : 1), cmd->device->lun); |
1da177e4 LT |
1305 | |
1306 | len = 1; | |
1307 | cmd->tag = 0; | |
1308 | ||
1309 | /* Send message(s) */ | |
1310 | data = tmp; | |
1311 | phase = PHASE_MSGOUT; | |
1312 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
52a6a1cb | 1313 | dprintk(NDEBUG_SELECTION, "scsi%d : nexus established.\n", instance->host_no); |
1da177e4 LT |
1314 | /* XXX need to handle errors here */ |
1315 | hostdata->connected = cmd; | |
9cb78c16 | 1316 | hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF)); |
1da177e4 | 1317 | |
28424d3a | 1318 | initialize_SCp(cmd); |
1da177e4 LT |
1319 | |
1320 | return 0; | |
1da177e4 LT |
1321 | } |
1322 | ||
1323 | /* | |
1324 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, | |
1325 | * unsigned char *phase, int *count, unsigned char **data) | |
1326 | * | |
1327 | * Purpose : transfers data in given phase using polled I/O | |
1328 | * | |
1329 | * Inputs : instance - instance of driver, *phase - pointer to | |
1330 | * what phase is expected, *count - pointer to number of | |
1331 | * bytes to transfer, **data - pointer to data pointer. | |
1332 | * | |
1333 | * Returns : -1 when different phase is entered without transferring | |
25985edc | 1334 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1da177e4 LT |
1335 | * is in same phase. |
1336 | * | |
1337 | * Also, *phase, *count, *data are modified in place. | |
1338 | * | |
1339 | * XXX Note : handling for bus free may be useful. | |
1340 | */ | |
1341 | ||
1342 | /* | |
1343 | * Note : this code is not as quick as it could be, however it | |
1344 | * IS 100% reliable, and for the actual data transfer where speed | |
1345 | * counts, we will always do a pseudo DMA or DMA transfer. | |
1346 | */ | |
1347 | ||
1348 | static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { | |
1da177e4 LT |
1349 | unsigned char p = *phase, tmp; |
1350 | int c = *count; | |
1351 | unsigned char *d = *data; | |
1da177e4 LT |
1352 | |
1353 | if (!(p & SR_IO)) | |
52a6a1cb | 1354 | dprintk(NDEBUG_PIO, "scsi%d : pio write %d bytes\n", instance->host_no, c); |
1da177e4 | 1355 | else |
52a6a1cb | 1356 | dprintk(NDEBUG_PIO, "scsi%d : pio read %d bytes\n", instance->host_no, c); |
1da177e4 LT |
1357 | |
1358 | /* | |
1359 | * The NCR5380 chip will only drive the SCSI bus when the | |
1360 | * phase specified in the appropriate bits of the TARGET COMMAND | |
1361 | * REGISTER match the STATUS REGISTER | |
1362 | */ | |
1363 | ||
1364 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); | |
1365 | ||
1da177e4 LT |
1366 | do { |
1367 | /* | |
1368 | * Wait for assertion of REQ, after which the phase bits will be | |
1369 | * valid | |
1370 | */ | |
1371 | ||
686f3990 | 1372 | if (NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ) < 0) |
1da177e4 | 1373 | break; |
1da177e4 | 1374 | |
52a6a1cb | 1375 | dprintk(NDEBUG_HANDSHAKE, "scsi%d : REQ detected\n", instance->host_no); |
1da177e4 LT |
1376 | |
1377 | /* Check for phase mismatch */ | |
686f3990 | 1378 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) != p) { |
52a6a1cb | 1379 | dprintk(NDEBUG_HANDSHAKE, "scsi%d : phase mismatch\n", instance->host_no); |
1da177e4 LT |
1380 | NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance); |
1381 | break; | |
1382 | } | |
1383 | /* Do actual transfer from SCSI bus to / from memory */ | |
1384 | if (!(p & SR_IO)) | |
1385 | NCR5380_write(OUTPUT_DATA_REG, *d); | |
1386 | else | |
1387 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
1388 | ||
1389 | ++d; | |
1390 | ||
1391 | /* | |
1392 | * The SCSI standard suggests that in MSGOUT phase, the initiator | |
1393 | * should drop ATN on the last byte of the message phase | |
1394 | * after REQ has been asserted for the handshake but before | |
1395 | * the initiator raises ACK. | |
1396 | */ | |
1397 | ||
1398 | if (!(p & SR_IO)) { | |
1399 | if (!((p & SR_MSG) && c > 1)) { | |
1400 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1401 | NCR5380_dprint(NDEBUG_PIO, instance); | |
1402 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK); | |
1403 | } else { | |
1404 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN); | |
1405 | NCR5380_dprint(NDEBUG_PIO, instance); | |
1406 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1407 | } | |
1408 | } else { | |
1409 | NCR5380_dprint(NDEBUG_PIO, instance); | |
1410 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); | |
1411 | } | |
1412 | ||
a2edc4a6 FT |
1413 | if (NCR5380_poll_politely(instance, |
1414 | STATUS_REG, SR_REQ, 0, 5 * HZ) < 0) | |
1415 | break; | |
1416 | ||
52a6a1cb | 1417 | dprintk(NDEBUG_HANDSHAKE, "scsi%d : req false, handshake complete\n", instance->host_no); |
1da177e4 LT |
1418 | |
1419 | /* | |
1420 | * We have several special cases to consider during REQ/ACK handshaking : | |
1421 | * 1. We were in MSGOUT phase, and we are on the last byte of the | |
1422 | * message. ATN must be dropped as ACK is dropped. | |
1423 | * | |
1424 | * 2. We are in a MSGIN phase, and we are on the last byte of the | |
1425 | * message. We must exit with ACK asserted, so that the calling | |
1426 | * code may raise ATN before dropping ACK to reject the message. | |
1427 | * | |
1428 | * 3. ACK and ATN are clear and the target may proceed as normal. | |
1429 | */ | |
1430 | if (!(p == PHASE_MSGIN && c == 1)) { | |
1431 | if (p == PHASE_MSGOUT && c > 1) | |
1432 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1433 | else | |
1434 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1435 | } | |
1436 | } while (--c); | |
1437 | ||
52a6a1cb | 1438 | dprintk(NDEBUG_PIO, "scsi%d : residual %d\n", instance->host_no, c); |
1da177e4 LT |
1439 | |
1440 | *count = c; | |
1441 | *data = d; | |
1442 | tmp = NCR5380_read(STATUS_REG); | |
a2edc4a6 FT |
1443 | /* The phase read from the bus is valid if either REQ is (already) |
1444 | * asserted or if ACK hasn't been released yet. The latter applies if | |
1445 | * we're in MSG IN, DATA IN or STATUS and all bytes have been received. | |
1446 | */ | |
1447 | if ((tmp & SR_REQ) || ((tmp & SR_IO) && c == 0)) | |
1da177e4 LT |
1448 | *phase = tmp & PHASE_MASK; |
1449 | else | |
1450 | *phase = PHASE_UNKNOWN; | |
1451 | ||
1452 | if (!c || (*phase == p)) | |
1453 | return 0; | |
1454 | else | |
1455 | return -1; | |
1456 | } | |
1457 | ||
1458 | /** | |
636b1ec8 FT |
1459 | * do_reset - issue a reset command |
1460 | * @instance: adapter to reset | |
1da177e4 | 1461 | * |
636b1ec8 FT |
1462 | * Issue a reset sequence to the NCR5380 and try and get the bus |
1463 | * back into sane shape. | |
1da177e4 | 1464 | * |
636b1ec8 FT |
1465 | * This clears the reset interrupt flag because there may be no handler for |
1466 | * it. When the driver is initialized, the NCR5380_intr() handler has not yet | |
1467 | * been installed. And when in EH we may have released the ST DMA interrupt. | |
1da177e4 LT |
1468 | */ |
1469 | ||
54d8fe44 FT |
1470 | static void do_reset(struct Scsi_Host *instance) |
1471 | { | |
636b1ec8 FT |
1472 | unsigned long flags; |
1473 | ||
1474 | local_irq_save(flags); | |
1475 | NCR5380_write(TARGET_COMMAND_REG, | |
1476 | PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); | |
1da177e4 | 1477 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); |
636b1ec8 | 1478 | udelay(50); |
1da177e4 | 1479 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
636b1ec8 FT |
1480 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1481 | local_irq_restore(flags); | |
1da177e4 LT |
1482 | } |
1483 | ||
80d3eb6d FT |
1484 | /** |
1485 | * do_abort - abort the currently established nexus by going to | |
1486 | * MESSAGE OUT phase and sending an ABORT message. | |
1487 | * @instance: relevant scsi host instance | |
1da177e4 | 1488 | * |
80d3eb6d | 1489 | * Returns 0 on success, -1 on failure. |
1da177e4 LT |
1490 | */ |
1491 | ||
54d8fe44 FT |
1492 | static int do_abort(struct Scsi_Host *instance) |
1493 | { | |
1da177e4 LT |
1494 | unsigned char *msgptr, phase, tmp; |
1495 | int len; | |
1496 | int rc; | |
1da177e4 LT |
1497 | |
1498 | /* Request message out phase */ | |
1499 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1500 | ||
1501 | /* | |
1502 | * Wait for the target to indicate a valid phase by asserting | |
1503 | * REQ. Once this happens, we'll have either a MSGOUT phase | |
1504 | * and can immediately send the ABORT message, or we'll have some | |
1505 | * other phase and will have to source/sink data. | |
1506 | * | |
1507 | * We really don't care what value was on the bus or what value | |
1508 | * the target sees, so we just handshake. | |
1509 | */ | |
1510 | ||
80d3eb6d | 1511 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 10 * HZ); |
1cc160e1 | 1512 | if (rc < 0) |
80d3eb6d | 1513 | goto timeout; |
1da177e4 | 1514 | |
f35d3474 | 1515 | tmp = NCR5380_read(STATUS_REG) & PHASE_MASK; |
1da177e4 LT |
1516 | |
1517 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1518 | ||
f35d3474 | 1519 | if (tmp != PHASE_MSGOUT) { |
1da177e4 | 1520 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); |
54d8fe44 | 1521 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 3 * HZ); |
1cc160e1 | 1522 | if (rc < 0) |
80d3eb6d FT |
1523 | goto timeout; |
1524 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1da177e4 LT |
1525 | } |
1526 | tmp = ABORT; | |
1527 | msgptr = &tmp; | |
1528 | len = 1; | |
1529 | phase = PHASE_MSGOUT; | |
54d8fe44 | 1530 | NCR5380_transfer_pio(instance, &phase, &len, &msgptr); |
1da177e4 LT |
1531 | |
1532 | /* | |
1533 | * If we got here, and the command completed successfully, | |
1534 | * we're about to go into bus free state. | |
1535 | */ | |
1536 | ||
1537 | return len ? -1 : 0; | |
80d3eb6d FT |
1538 | |
1539 | timeout: | |
1540 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1541 | return -1; | |
1da177e4 LT |
1542 | } |
1543 | ||
1544 | #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL) | |
1545 | /* | |
1546 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, | |
1547 | * unsigned char *phase, int *count, unsigned char **data) | |
1548 | * | |
1549 | * Purpose : transfers data in given phase using either real | |
1550 | * or pseudo DMA. | |
1551 | * | |
1552 | * Inputs : instance - instance of driver, *phase - pointer to | |
1553 | * what phase is expected, *count - pointer to number of | |
1554 | * bytes to transfer, **data - pointer to data pointer. | |
1555 | * | |
1556 | * Returns : -1 when different phase is entered without transferring | |
25985edc | 1557 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1da177e4 LT |
1558 | * is in same phase. |
1559 | * | |
1560 | * Also, *phase, *count, *data are modified in place. | |
1561 | * | |
1562 | * Locks: io_request lock held by caller | |
1563 | */ | |
1564 | ||
1565 | ||
1566 | static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { | |
1da177e4 LT |
1567 | register int c = *count; |
1568 | register unsigned char p = *phase; | |
1569 | register unsigned char *d = *data; | |
1570 | unsigned char tmp; | |
1571 | int foo; | |
1572 | #if defined(REAL_DMA_POLL) | |
1573 | int cnt, toPIO; | |
1574 | unsigned char saved_data = 0, overrun = 0, residue; | |
1575 | #endif | |
1576 | ||
1577 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
1578 | ||
1da177e4 LT |
1579 | if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { |
1580 | *phase = tmp; | |
1581 | return -1; | |
1582 | } | |
1583 | #if defined(REAL_DMA) || defined(REAL_DMA_POLL) | |
1da177e4 | 1584 | if (p & SR_IO) { |
9db6024e FT |
1585 | if (!(hostdata->flags & FLAG_NO_DMA_FIXUPS)) |
1586 | c -= 2; | |
1da177e4 | 1587 | } |
52a6a1cb | 1588 | 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 |
1589 | hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c); |
1590 | #endif | |
1591 | ||
1592 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); | |
1593 | ||
1594 | #ifdef REAL_DMA | |
cd400825 FT |
1595 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | |
1596 | MR_ENABLE_EOP_INTR); | |
1da177e4 | 1597 | #elif defined(REAL_DMA_POLL) |
cd400825 | 1598 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY); |
1da177e4 LT |
1599 | #else |
1600 | /* | |
1601 | * Note : on my sample board, watch-dog timeouts occurred when interrupts | |
1602 | * were not disabled for the duration of a single DMA transfer, from | |
1603 | * before the setting of DMA mode to after transfer of the last byte. | |
1604 | */ | |
1605 | ||
55181be8 | 1606 | if (hostdata->flags & FLAG_NO_DMA_FIXUP) |
cd400825 FT |
1607 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | |
1608 | MR_ENABLE_EOP_INTR); | |
1da177e4 | 1609 | else |
cd400825 | 1610 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY); |
1da177e4 LT |
1611 | #endif /* def REAL_DMA */ |
1612 | ||
52a6a1cb | 1613 | dprintk(NDEBUG_DMA, "scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG)); |
1da177e4 LT |
1614 | |
1615 | /* | |
1616 | * On the PAS16 at least I/O recovery delays are not needed here. | |
1617 | * Everyone else seems to want them. | |
1618 | */ | |
1619 | ||
1620 | if (p & SR_IO) { | |
1621 | io_recovery_delay(1); | |
1622 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); | |
1623 | } else { | |
1624 | io_recovery_delay(1); | |
1625 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1626 | io_recovery_delay(1); | |
1627 | NCR5380_write(START_DMA_SEND_REG, 0); | |
1628 | io_recovery_delay(1); | |
1629 | } | |
1630 | ||
1631 | #if defined(REAL_DMA_POLL) | |
1632 | do { | |
1633 | tmp = NCR5380_read(BUS_AND_STATUS_REG); | |
1634 | } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER))); | |
1635 | ||
1636 | /* | |
1637 | At this point, either we've completed DMA, or we have a phase mismatch, | |
1638 | or we've unexpectedly lost BUSY (which is a real error). | |
1639 | ||
1640 | For write DMAs, we want to wait until the last byte has been | |
1641 | transferred out over the bus before we turn off DMA mode. Alas, there | |
1642 | seems to be no terribly good way of doing this on a 5380 under all | |
1643 | conditions. For non-scatter-gather operations, we can wait until REQ | |
1644 | and ACK both go false, or until a phase mismatch occurs. Gather-writes | |
1645 | are nastier, since the device will be expecting more data than we | |
1646 | are prepared to send it, and REQ will remain asserted. On a 53C8[01] we | |
1647 | could test LAST BIT SENT to assure transfer (I imagine this is precisely | |
1648 | why this signal was added to the newer chips) but on the older 538[01] | |
1649 | this signal does not exist. The workaround for this lack is a watchdog; | |
1650 | we bail out of the wait-loop after a modest amount of wait-time if | |
1651 | the usual exit conditions are not met. Not a terribly clean or | |
1652 | correct solution :-% | |
1653 | ||
1654 | Reads are equally tricky due to a nasty characteristic of the NCR5380. | |
1655 | If the chip is in DMA mode for an READ, it will respond to a target's | |
1656 | REQ by latching the SCSI data into the INPUT DATA register and asserting | |
1657 | ACK, even if it has _already_ been notified by the DMA controller that | |
1658 | the current DMA transfer has completed! If the NCR5380 is then taken | |
1659 | out of DMA mode, this already-acknowledged byte is lost. | |
1660 | ||
1661 | This is not a problem for "one DMA transfer per command" reads, because | |
1662 | the situation will never arise... either all of the data is DMA'ed | |
1663 | properly, or the target switches to MESSAGE IN phase to signal a | |
1664 | disconnection (either operation bringing the DMA to a clean halt). | |
1665 | However, in order to handle scatter-reads, we must work around the | |
1666 | problem. The chosen fix is to DMA N-2 bytes, then check for the | |
1667 | condition before taking the NCR5380 out of DMA mode. One or two extra | |
1668 | bytes are transferred via PIO as necessary to fill out the original | |
1669 | request. | |
1670 | */ | |
1671 | ||
1672 | if (p & SR_IO) { | |
9db6024e FT |
1673 | if (!(hostdata->flags & FLAG_NO_DMA_FIXUPS)) { |
1674 | udelay(10); | |
1675 | if ((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == | |
1676 | (BASR_PHASE_MATCH | BASR_ACK)) { | |
1677 | saved_data = NCR5380_read(INPUT_DATA_REGISTER); | |
1678 | overrun = 1; | |
1679 | } | |
1da177e4 | 1680 | } |
1da177e4 LT |
1681 | } else { |
1682 | int limit = 100; | |
1683 | while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) { | |
1684 | if (!(tmp & BASR_PHASE_MATCH)) | |
1685 | break; | |
1686 | if (--limit < 0) | |
1687 | break; | |
1688 | } | |
1689 | } | |
1690 | ||
52a6a1cb | 1691 | 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 |
1692 | |
1693 | NCR5380_write(MODE_REG, MR_BASE); | |
1694 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1695 | ||
1696 | residue = NCR5380_dma_residual(instance); | |
1697 | c -= residue; | |
1698 | *count -= c; | |
1699 | *data += c; | |
1700 | *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; | |
1701 | ||
9db6024e FT |
1702 | if (!(hostdata->flags & FLAG_NO_DMA_FIXUPS) && |
1703 | *phase == p && (p & SR_IO) && residue == 0) { | |
1da177e4 | 1704 | if (overrun) { |
52a6a1cb | 1705 | dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n"); |
1da177e4 LT |
1706 | **data = saved_data; |
1707 | *data += 1; | |
1708 | *count -= 1; | |
1709 | cnt = toPIO = 1; | |
1710 | } else { | |
1711 | printk("No overrun??\n"); | |
1712 | cnt = toPIO = 2; | |
1713 | } | |
52a6a1cb | 1714 | dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%X\n", cnt, *data); |
1da177e4 LT |
1715 | NCR5380_transfer_pio(instance, phase, &cnt, data); |
1716 | *count -= toPIO - cnt; | |
1717 | } | |
1da177e4 | 1718 | |
52a6a1cb | 1719 | 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 |
1720 | return 0; |
1721 | ||
1722 | #elif defined(REAL_DMA) | |
1723 | return 0; | |
1724 | #else /* defined(REAL_DMA_POLL) */ | |
1725 | if (p & SR_IO) { | |
55181be8 FT |
1726 | foo = NCR5380_pread(instance, d, |
1727 | hostdata->flags & FLAG_NO_DMA_FIXUP ? c : c - 1); | |
1728 | if (!foo && !(hostdata->flags & FLAG_NO_DMA_FIXUP)) { | |
1da177e4 LT |
1729 | /* |
1730 | * We can't disable DMA mode after successfully transferring | |
1731 | * what we plan to be the last byte, since that would open up | |
1732 | * a race condition where if the target asserted REQ before | |
1733 | * we got the DMA mode reset, the NCR5380 would have latched | |
1734 | * an additional byte into the INPUT DATA register and we'd | |
1735 | * have dropped it. | |
1736 | * | |
1737 | * The workaround was to transfer one fewer bytes than we | |
1738 | * intended to with the pseudo-DMA read function, wait for | |
1739 | * the chip to latch the last byte, read it, and then disable | |
1740 | * pseudo-DMA mode. | |
1741 | * | |
1742 | * After REQ is asserted, the NCR5380 asserts DRQ and ACK. | |
1743 | * REQ is deasserted when ACK is asserted, and not reasserted | |
1744 | * until ACK goes false. Since the NCR5380 won't lower ACK | |
1745 | * until DACK is asserted, which won't happen unless we twiddle | |
1746 | * the DMA port or we take the NCR5380 out of DMA mode, we | |
1747 | * can guarantee that we won't handshake another extra | |
1748 | * byte. | |
1749 | */ | |
1750 | ||
55181be8 FT |
1751 | if (NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, |
1752 | BASR_DRQ, BASR_DRQ, HZ) < 0) { | |
1753 | foo = -1; | |
1754 | shost_printk(KERN_ERR, instance, "PDMA read: DRQ timeout\n"); | |
1755 | } | |
1756 | if (NCR5380_poll_politely(instance, STATUS_REG, | |
1757 | SR_REQ, 0, HZ) < 0) { | |
1758 | foo = -1; | |
1759 | shost_printk(KERN_ERR, instance, "PDMA read: !REQ timeout\n"); | |
1da177e4 | 1760 | } |
55181be8 | 1761 | d[c - 1] = NCR5380_read(INPUT_DATA_REG); |
1da177e4 | 1762 | } |
1da177e4 | 1763 | } else { |
1da177e4 | 1764 | foo = NCR5380_pwrite(instance, d, c); |
55181be8 | 1765 | if (!foo && !(hostdata->flags & FLAG_NO_DMA_FIXUP)) { |
1da177e4 LT |
1766 | /* |
1767 | * Wait for the last byte to be sent. If REQ is being asserted for | |
1768 | * the byte we're interested, we'll ACK it and it will go false. | |
1769 | */ | |
55181be8 FT |
1770 | if (NCR5380_poll_politely2(instance, |
1771 | BUS_AND_STATUS_REG, BASR_DRQ, BASR_DRQ, | |
1772 | BUS_AND_STATUS_REG, BASR_PHASE_MATCH, 0, HZ) < 0) { | |
1773 | foo = -1; | |
1774 | shost_printk(KERN_ERR, instance, "PDMA write: DRQ and phase timeout\n"); | |
1da177e4 LT |
1775 | } |
1776 | } | |
1da177e4 LT |
1777 | } |
1778 | NCR5380_write(MODE_REG, MR_BASE); | |
1779 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
cd400825 | 1780 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1da177e4 LT |
1781 | *data = d + c; |
1782 | *count = 0; | |
1783 | *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; | |
1da177e4 LT |
1784 | return foo; |
1785 | #endif /* def REAL_DMA */ | |
1786 | } | |
1787 | #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */ | |
1788 | ||
1789 | /* | |
1790 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) | |
1791 | * | |
1792 | * Purpose : run through the various SCSI phases and do as the target | |
1793 | * directs us to. Operates on the currently connected command, | |
1794 | * instance->connected. | |
1795 | * | |
1796 | * Inputs : instance, instance for which we are doing commands | |
1797 | * | |
1798 | * Side effects : SCSI things happen, the disconnected queue will be | |
1799 | * modified if a command disconnects, *instance->connected will | |
1800 | * change. | |
1801 | * | |
1802 | * XXX Note : we need to watch for bus free or a reset condition here | |
1803 | * to recover from an unexpected bus free condition. | |
1804 | * | |
1805 | * Locks: io_request_lock held by caller in IRQ mode | |
1806 | */ | |
1807 | ||
1808 | static void NCR5380_information_transfer(struct Scsi_Host *instance) { | |
1da177e4 LT |
1809 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata; |
1810 | unsigned char msgout = NOP; | |
1811 | int sink = 0; | |
1812 | int len; | |
1813 | #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) | |
1814 | int transfersize; | |
1815 | #endif | |
1816 | unsigned char *data; | |
1817 | unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; | |
710ddd0d | 1818 | struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected; |
1da177e4 | 1819 | |
1da177e4 LT |
1820 | while (1) { |
1821 | tmp = NCR5380_read(STATUS_REG); | |
1822 | /* We only have a valid SCSI phase when REQ is asserted */ | |
1823 | if (tmp & SR_REQ) { | |
1824 | phase = (tmp & PHASE_MASK); | |
1825 | if (phase != old_phase) { | |
1826 | old_phase = phase; | |
1827 | NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); | |
1828 | } | |
1829 | if (sink && (phase != PHASE_MSGOUT)) { | |
1830 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1831 | ||
1832 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1833 | while (NCR5380_read(STATUS_REG) & SR_REQ); | |
1834 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1835 | sink = 0; | |
1836 | continue; | |
1837 | } | |
1838 | switch (phase) { | |
1839 | case PHASE_DATAIN: | |
1840 | case PHASE_DATAOUT: | |
1841 | #if (NDEBUG & NDEBUG_NO_DATAOUT) | |
1842 | printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no); | |
1843 | sink = 1; | |
1844 | do_abort(instance); | |
1845 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 1846 | cmd->scsi_done(cmd); |
1da177e4 LT |
1847 | return; |
1848 | #endif | |
1849 | /* | |
1850 | * If there is no room left in the current buffer in the | |
1851 | * scatter-gather list, move onto the next one. | |
1852 | */ | |
1853 | ||
1854 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1855 | ++cmd->SCp.buffer; | |
1856 | --cmd->SCp.buffers_residual; | |
1857 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
45711f1a | 1858 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
52a6a1cb | 1859 | 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 |
1860 | } |
1861 | /* | |
1862 | * The preferred transfer method is going to be | |
1863 | * PSEUDO-DMA for systems that are strictly PIO, | |
1864 | * since we can let the hardware do the handshaking. | |
1865 | * | |
1866 | * For this to work, we need to know the transfersize | |
1867 | * ahead of time, since the pseudo-DMA code will sit | |
1868 | * in an unconditional loop. | |
1869 | */ | |
1870 | ||
1871 | #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) | |
ff3d4578 FT |
1872 | transfersize = 0; |
1873 | if (!cmd->device->borken && | |
1874 | !(hostdata->flags & FLAG_NO_PSEUDO_DMA)) | |
1875 | transfersize = NCR5380_dma_xfer_len(instance, cmd, phase); | |
1876 | ||
1877 | if (transfersize) { | |
1da177e4 LT |
1878 | len = transfersize; |
1879 | if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) { | |
1880 | /* | |
1881 | * If the watchdog timer fires, all future accesses to this | |
1882 | * device will use the polled-IO. | |
1883 | */ | |
017560fc JG |
1884 | scmd_printk(KERN_INFO, cmd, |
1885 | "switching to slow handshake\n"); | |
1da177e4 | 1886 | cmd->device->borken = 1; |
1da177e4 LT |
1887 | sink = 1; |
1888 | do_abort(instance); | |
1889 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 1890 | cmd->scsi_done(cmd); |
1da177e4 LT |
1891 | /* XXX - need to source or sink data here, as appropriate */ |
1892 | } else | |
1893 | cmd->SCp.this_residual -= transfersize - len; | |
1894 | } else | |
1895 | #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */ | |
1896 | NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **) | |
1897 | &cmd->SCp.ptr); | |
1898 | break; | |
1899 | case PHASE_MSGIN: | |
1900 | len = 1; | |
1901 | data = &tmp; | |
1902 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
1903 | cmd->SCp.Message = tmp; | |
1904 | ||
1905 | switch (tmp) { | |
1da177e4 LT |
1906 | case ABORT: |
1907 | case COMMAND_COMPLETE: | |
1908 | /* Accept message by clearing ACK */ | |
1909 | sink = 1; | |
1910 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1911 | hostdata->connected = NULL; | |
9cb78c16 HR |
1912 | dprintk(NDEBUG_QUEUES, "scsi%d : command for target %d, lun %llu completed\n", instance->host_no, cmd->device->id, cmd->device->lun); |
1913 | hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xFF)); | |
1da177e4 LT |
1914 | |
1915 | /* | |
1916 | * I'm not sure what the correct thing to do here is : | |
1917 | * | |
1918 | * If the command that just executed is NOT a request | |
1919 | * sense, the obvious thing to do is to set the result | |
1920 | * code to the values of the stored parameters. | |
1921 | * | |
1922 | * If it was a REQUEST SENSE command, we need some way | |
1923 | * to differentiate between the failure code of the original | |
1924 | * and the failure code of the REQUEST sense - the obvious | |
1925 | * case is success, where we fall through and leave the result | |
1926 | * code unchanged. | |
1927 | * | |
1928 | * The non-obvious place is where the REQUEST SENSE failed | |
1929 | */ | |
1930 | ||
1931 | if (cmd->cmnd[0] != REQUEST_SENSE) | |
1932 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | |
1933 | else if (status_byte(cmd->SCp.Status) != GOOD) | |
1934 | cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); | |
1935 | ||
28424d3a BH |
1936 | if ((cmd->cmnd[0] == REQUEST_SENSE) && |
1937 | hostdata->ses.cmd_len) { | |
1938 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
1939 | hostdata->ses.cmd_len = 0 ; | |
1940 | } | |
1941 | ||
1da177e4 | 1942 | if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { |
28424d3a BH |
1943 | scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); |
1944 | ||
52a6a1cb | 1945 | dprintk(NDEBUG_AUTOSENSE, "scsi%d : performing request sense\n", instance->host_no); |
1da177e4 LT |
1946 | |
1947 | LIST(cmd, hostdata->issue_queue); | |
1948 | cmd->host_scribble = (unsigned char *) | |
1949 | hostdata->issue_queue; | |
710ddd0d | 1950 | hostdata->issue_queue = (struct scsi_cmnd *) cmd; |
52a6a1cb | 1951 | dprintk(NDEBUG_QUEUES, "scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no); |
997acab7 | 1952 | } else { |
1da177e4 LT |
1953 | cmd->scsi_done(cmd); |
1954 | } | |
1955 | ||
1956 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1957 | /* | |
1958 | * Restore phase bits to 0 so an interrupted selection, | |
1959 | * arbitration can resume. | |
1960 | */ | |
1961 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
1da177e4 LT |
1962 | return; |
1963 | case MESSAGE_REJECT: | |
1964 | /* Accept message by clearing ACK */ | |
1965 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1966 | switch (hostdata->last_message) { | |
1967 | case HEAD_OF_QUEUE_TAG: | |
1968 | case ORDERED_QUEUE_TAG: | |
1969 | case SIMPLE_QUEUE_TAG: | |
1970 | cmd->device->simple_tags = 0; | |
9cb78c16 | 1971 | hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF)); |
1da177e4 LT |
1972 | break; |
1973 | default: | |
1974 | break; | |
1975 | } | |
340b9612 | 1976 | break; |
1da177e4 LT |
1977 | case DISCONNECT:{ |
1978 | /* Accept message by clearing ACK */ | |
1979 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1da177e4 LT |
1980 | LIST(cmd, hostdata->disconnected_queue); |
1981 | cmd->host_scribble = (unsigned char *) | |
1982 | hostdata->disconnected_queue; | |
1983 | hostdata->connected = NULL; | |
1984 | hostdata->disconnected_queue = cmd; | |
9cb78c16 | 1985 | 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 |
1986 | /* |
1987 | * Restore phase bits to 0 so an interrupted selection, | |
1988 | * arbitration can resume. | |
1989 | */ | |
1990 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
1991 | ||
1992 | /* Enable reselect interrupts */ | |
1993 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1da177e4 LT |
1994 | return; |
1995 | } | |
1996 | /* | |
1997 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect | |
1998 | * operation, in violation of the SCSI spec so we can safely | |
1999 | * ignore SAVE/RESTORE pointers calls. | |
2000 | * | |
2001 | * Unfortunately, some disks violate the SCSI spec and | |
2002 | * don't issue the required SAVE_POINTERS message before | |
2003 | * disconnecting, and we have to break spec to remain | |
2004 | * compatible. | |
2005 | */ | |
2006 | case SAVE_POINTERS: | |
2007 | case RESTORE_POINTERS: | |
2008 | /* Accept message by clearing ACK */ | |
2009 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2010 | break; | |
2011 | case EXTENDED_MESSAGE: | |
2012 | /* | |
2013 | * Extended messages are sent in the following format : | |
2014 | * Byte | |
2015 | * 0 EXTENDED_MESSAGE == 1 | |
2016 | * 1 length (includes one byte for code, doesn't | |
2017 | * include first two bytes) | |
2018 | * 2 code | |
2019 | * 3..length+1 arguments | |
2020 | * | |
2021 | * Start the extended message buffer with the EXTENDED_MESSAGE | |
1abfd370 | 2022 | * byte, since spi_print_msg() wants the whole thing. |
1da177e4 LT |
2023 | */ |
2024 | extended_msg[0] = EXTENDED_MESSAGE; | |
2025 | /* Accept first byte by clearing ACK */ | |
2026 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
52a6a1cb | 2027 | dprintk(NDEBUG_EXTENDED, "scsi%d : receiving extended message\n", instance->host_no); |
1da177e4 LT |
2028 | |
2029 | len = 2; | |
2030 | data = extended_msg + 1; | |
2031 | phase = PHASE_MSGIN; | |
2032 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2033 | ||
52a6a1cb | 2034 | dprintk(NDEBUG_EXTENDED, "scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2]); |
1da177e4 LT |
2035 | |
2036 | if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) { | |
2037 | /* Accept third byte by clearing ACK */ | |
2038 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2039 | len = extended_msg[1] - 1; | |
2040 | data = extended_msg + 3; | |
2041 | phase = PHASE_MSGIN; | |
2042 | ||
2043 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
52a6a1cb | 2044 | dprintk(NDEBUG_EXTENDED, "scsi%d : message received, residual %d\n", instance->host_no, len); |
1da177e4 LT |
2045 | |
2046 | switch (extended_msg[2]) { | |
2047 | case EXTENDED_SDTR: | |
2048 | case EXTENDED_WDTR: | |
2049 | case EXTENDED_MODIFY_DATA_POINTER: | |
2050 | case EXTENDED_EXTENDED_IDENTIFY: | |
2051 | tmp = 0; | |
2052 | } | |
2053 | } else if (len) { | |
2054 | printk("scsi%d: error receiving extended message\n", instance->host_no); | |
2055 | tmp = 0; | |
2056 | } else { | |
2057 | printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]); | |
2058 | tmp = 0; | |
2059 | } | |
2060 | /* Fall through to reject message */ | |
2061 | ||
2062 | /* | |
2063 | * If we get something weird that we aren't expecting, | |
2064 | * reject it. | |
2065 | */ | |
2066 | default: | |
2067 | if (!tmp) { | |
2068 | printk("scsi%d: rejecting message ", instance->host_no); | |
1abfd370 | 2069 | spi_print_msg(extended_msg); |
1da177e4 LT |
2070 | printk("\n"); |
2071 | } else if (tmp != EXTENDED_MESSAGE) | |
017560fc JG |
2072 | scmd_printk(KERN_INFO, cmd, |
2073 | "rejecting unknown message %02x\n",tmp); | |
1da177e4 | 2074 | else |
017560fc JG |
2075 | scmd_printk(KERN_INFO, cmd, |
2076 | "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]); | |
1da177e4 LT |
2077 | |
2078 | msgout = MESSAGE_REJECT; | |
2079 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
2080 | break; | |
2081 | } /* switch (tmp) */ | |
2082 | break; | |
2083 | case PHASE_MSGOUT: | |
2084 | len = 1; | |
2085 | data = &msgout; | |
2086 | hostdata->last_message = msgout; | |
2087 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2088 | if (msgout == ABORT) { | |
9cb78c16 | 2089 | hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xFF)); |
1da177e4 LT |
2090 | hostdata->connected = NULL; |
2091 | cmd->result = DID_ERROR << 16; | |
1da177e4 LT |
2092 | cmd->scsi_done(cmd); |
2093 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2094 | return; | |
2095 | } | |
2096 | msgout = NOP; | |
2097 | break; | |
2098 | case PHASE_CMDOUT: | |
2099 | len = cmd->cmd_len; | |
2100 | data = cmd->cmnd; | |
2101 | /* | |
2102 | * XXX for performance reasons, on machines with a | |
2103 | * PSEUDO-DMA architecture we should probably | |
2104 | * use the dma transfer function. | |
2105 | */ | |
2106 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
1da177e4 LT |
2107 | break; |
2108 | case PHASE_STATIN: | |
2109 | len = 1; | |
2110 | data = &tmp; | |
2111 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2112 | cmd->SCp.Status = tmp; | |
2113 | break; | |
2114 | default: | |
2115 | printk("scsi%d : unknown phase\n", instance->host_no); | |
4dde8f7d | 2116 | NCR5380_dprint(NDEBUG_ANY, instance); |
1da177e4 | 2117 | } /* switch(phase) */ |
686f3990 FT |
2118 | } else { |
2119 | spin_unlock_irq(instance->host_lock); | |
2120 | NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); | |
2121 | spin_lock_irq(instance->host_lock); | |
1da177e4 LT |
2122 | } |
2123 | } /* while (1) */ | |
2124 | } | |
2125 | ||
2126 | /* | |
2127 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) | |
2128 | * | |
2129 | * Purpose : does reselection, initializing the instance->connected | |
710ddd0d | 2130 | * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q |
1da177e4 LT |
2131 | * nexus has been reestablished, |
2132 | * | |
2133 | * Inputs : instance - this instance of the NCR5380. | |
2134 | * | |
2135 | * Locks: io_request_lock held by caller if IRQ driven | |
2136 | */ | |
2137 | ||
2138 | static void NCR5380_reselect(struct Scsi_Host *instance) { | |
1da177e4 LT |
2139 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) |
2140 | instance->hostdata; | |
2141 | unsigned char target_mask; | |
2142 | unsigned char lun, phase; | |
2143 | int len; | |
2144 | unsigned char msg[3]; | |
2145 | unsigned char *data; | |
710ddd0d | 2146 | struct scsi_cmnd *tmp = NULL, *prev; |
1da177e4 | 2147 | int abort = 0; |
1da177e4 LT |
2148 | |
2149 | /* | |
2150 | * Disable arbitration, etc. since the host adapter obviously | |
2151 | * lost, and tell an interrupted NCR5380_select() to restart. | |
2152 | */ | |
2153 | ||
2154 | NCR5380_write(MODE_REG, MR_BASE); | |
1da177e4 LT |
2155 | |
2156 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); | |
52a6a1cb | 2157 | dprintk(NDEBUG_SELECTION, "scsi%d : reselect\n", instance->host_no); |
1da177e4 LT |
2158 | |
2159 | /* | |
2160 | * At this point, we have detected that our SCSI ID is on the bus, | |
2161 | * SEL is true and BSY was false for at least one bus settle delay | |
2162 | * (400 ns). | |
2163 | * | |
2164 | * We must assert BSY ourselves, until the target drops the SEL | |
2165 | * signal. | |
2166 | */ | |
2167 | ||
2168 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); | |
2169 | ||
2170 | /* FIXME: timeout too long, must fail to workqueue */ | |
2171 | if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0) | |
2172 | abort = 1; | |
2173 | ||
2174 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2175 | ||
2176 | /* | |
2177 | * Wait for target to go into MSGIN. | |
2178 | * FIXME: timeout needed and fail to work queeu | |
2179 | */ | |
2180 | ||
1cc160e1 FT |
2181 | if (NCR5380_poll_politely(instance, |
2182 | STATUS_REG, SR_REQ, SR_REQ, 2 * HZ) < 0) | |
1da177e4 LT |
2183 | abort = 1; |
2184 | ||
2185 | len = 1; | |
2186 | data = msg; | |
2187 | phase = PHASE_MSGIN; | |
2188 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2189 | ||
2190 | if (!(msg[0] & 0x80)) { | |
2191 | printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no); | |
1abfd370 | 2192 | spi_print_msg(msg); |
1da177e4 LT |
2193 | abort = 1; |
2194 | } else { | |
2195 | /* Accept message by clearing ACK */ | |
2196 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2197 | lun = (msg[0] & 0x07); | |
2198 | ||
2199 | /* | |
2200 | * We need to add code for SCSI-II to track which devices have | |
2201 | * I_T_L_Q nexuses established, and which have simple I_T_L | |
2202 | * nexuses so we can chose to do additional data transfer. | |
2203 | */ | |
2204 | ||
2205 | /* | |
2206 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we | |
2207 | * just reestablished, and remove it from the disconnected queue. | |
2208 | */ | |
2209 | ||
2210 | ||
710ddd0d | 2211 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (struct scsi_cmnd *) tmp->host_scribble) |
9cb78c16 | 2212 | if ((target_mask == (1 << tmp->device->id)) && (lun == (u8)tmp->device->lun) |
1da177e4 LT |
2213 | ) { |
2214 | if (prev) { | |
2215 | REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); | |
2216 | prev->host_scribble = tmp->host_scribble; | |
2217 | } else { | |
2218 | REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble); | |
710ddd0d | 2219 | hostdata->disconnected_queue = (struct scsi_cmnd *) tmp->host_scribble; |
1da177e4 LT |
2220 | } |
2221 | tmp->host_scribble = NULL; | |
2222 | break; | |
2223 | } | |
2224 | if (!tmp) { | |
2225 | printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun); | |
2226 | /* | |
2227 | * Since we have an established nexus that we can't do anything with, | |
2228 | * we must abort it. | |
2229 | */ | |
2230 | abort = 1; | |
2231 | } | |
2232 | } | |
2233 | ||
2234 | if (abort) { | |
2235 | do_abort(instance); | |
2236 | } else { | |
2237 | hostdata->connected = tmp; | |
9cb78c16 | 2238 | 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 |
2239 | } |
2240 | } | |
2241 | ||
2242 | /* | |
2243 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) | |
2244 | * | |
2245 | * Purpose : called by interrupt handler when DMA finishes or a phase | |
2246 | * mismatch occurs (which would finish the DMA transfer). | |
2247 | * | |
2248 | * Inputs : instance - this instance of the NCR5380. | |
2249 | * | |
710ddd0d | 2250 | * Returns : pointer to the scsi_cmnd structure for which the I_T_L |
1da177e4 LT |
2251 | * nexus has been reestablished, on failure NULL is returned. |
2252 | */ | |
2253 | ||
2254 | #ifdef REAL_DMA | |
2255 | static void NCR5380_dma_complete(NCR5380_instance * instance) { | |
f8343685 | 2256 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
1da177e4 | 2257 | int transferred; |
1da177e4 LT |
2258 | |
2259 | /* | |
2260 | * XXX this might not be right. | |
2261 | * | |
2262 | * Wait for final byte to transfer, ie wait for ACK to go false. | |
2263 | * | |
2264 | * We should use the Last Byte Sent bit, unfortunately this is | |
2265 | * not available on the 5380/5381 (only the various CMOS chips) | |
2266 | * | |
2267 | * FIXME: timeout, and need to handle long timeout/irq case | |
2268 | */ | |
2269 | ||
2270 | NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ); | |
2271 | ||
1da177e4 LT |
2272 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2273 | ||
2274 | /* | |
2275 | * The only places we should see a phase mismatch and have to send | |
2276 | * data from the same set of pointers will be the data transfer | |
2277 | * phases. So, residual, requested length are only important here. | |
2278 | */ | |
2279 | ||
2280 | if (!(hostdata->connected->SCp.phase & SR_CD)) { | |
2281 | transferred = instance->dmalen - NCR5380_dma_residual(); | |
2282 | hostdata->connected->SCp.this_residual -= transferred; | |
2283 | hostdata->connected->SCp.ptr += transferred; | |
2284 | } | |
2285 | } | |
2286 | #endif /* def REAL_DMA */ | |
2287 | ||
2288 | /* | |
710ddd0d | 2289 | * Function : int NCR5380_abort (struct scsi_cmnd *cmd) |
1da177e4 LT |
2290 | * |
2291 | * Purpose : abort a command | |
2292 | * | |
710ddd0d | 2293 | * Inputs : cmd - the scsi_cmnd to abort, code - code to set the |
b6c92b7e | 2294 | * host byte of the result field to, if zero DID_ABORTED is |
1da177e4 LT |
2295 | * used. |
2296 | * | |
b6c92b7e | 2297 | * Returns : SUCCESS - success, FAILED on failure. |
1da177e4 | 2298 | * |
b6c92b7e HR |
2299 | * XXX - there is no way to abort the command that is currently |
2300 | * connected, you have to wait for it to complete. If this is | |
1da177e4 LT |
2301 | * a problem, we could implement longjmp() / setjmp(), setjmp() |
2302 | * called where the loop started in NCR5380_main(). | |
2303 | * | |
2304 | * Locks: host lock taken by caller | |
2305 | */ | |
2306 | ||
710ddd0d FT |
2307 | static int NCR5380_abort(struct scsi_cmnd *cmd) |
2308 | { | |
1da177e4 LT |
2309 | struct Scsi_Host *instance = cmd->device->host; |
2310 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
710ddd0d | 2311 | struct scsi_cmnd *tmp, **prev; |
1fa6b5fb HR |
2312 | |
2313 | scmd_printk(KERN_WARNING, cmd, "aborting command\n"); | |
1da177e4 | 2314 | |
9dafbd93 | 2315 | spin_lock_irq(instance->host_lock); |
1da177e4 LT |
2316 | NCR5380_print_status(instance); |
2317 | ||
52a6a1cb FT |
2318 | dprintk(NDEBUG_ABORT, "scsi%d : abort called\n", instance->host_no); |
2319 | dprintk(NDEBUG_ABORT, " basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG)); | |
1da177e4 LT |
2320 | |
2321 | #if 0 | |
2322 | /* | |
2323 | * Case 1 : If the command is the currently executing command, | |
2324 | * we'll set the aborted flag and return control so that | |
2325 | * information transfer routine can exit cleanly. | |
2326 | */ | |
2327 | ||
2328 | if (hostdata->connected == cmd) { | |
52a6a1cb | 2329 | dprintk(NDEBUG_ABORT, "scsi%d : aborting connected command\n", instance->host_no); |
1da177e4 LT |
2330 | /* |
2331 | * We should perform BSY checking, and make sure we haven't slipped | |
2332 | * into BUS FREE. | |
2333 | */ | |
2334 | ||
2335 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); | |
2336 | /* | |
2337 | * Since we can't change phases until we've completed the current | |
2338 | * handshake, we have to source or sink a byte of data if the current | |
2339 | * phase is not MSGOUT. | |
2340 | */ | |
2341 | ||
2342 | /* | |
2343 | * Return control to the executing NCR drive so we can clear the | |
2344 | * aborted flag and get back into our main loop. | |
2345 | */ | |
2346 | ||
b6c92b7e | 2347 | return SUCCESS; |
1da177e4 LT |
2348 | } |
2349 | #endif | |
2350 | ||
2351 | /* | |
2352 | * Case 2 : If the command hasn't been issued yet, we simply remove it | |
2353 | * from the issue queue. | |
2354 | */ | |
2355 | ||
52a6a1cb | 2356 | dprintk(NDEBUG_ABORT, "scsi%d : abort going into loop.\n", instance->host_no); |
710ddd0d | 2357 | 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 |
2358 | if (cmd == tmp) { |
2359 | REMOVE(5, *prev, tmp, tmp->host_scribble); | |
710ddd0d | 2360 | (*prev) = (struct scsi_cmnd *) tmp->host_scribble; |
1da177e4 | 2361 | tmp->host_scribble = NULL; |
9dafbd93 | 2362 | spin_unlock_irq(instance->host_lock); |
1da177e4 | 2363 | tmp->result = DID_ABORT << 16; |
52a6a1cb | 2364 | dprintk(NDEBUG_ABORT, "scsi%d : abort removed command from issue queue.\n", instance->host_no); |
cce99c69 | 2365 | tmp->scsi_done(tmp); |
1da177e4 LT |
2366 | return SUCCESS; |
2367 | } | |
2368 | #if (NDEBUG & NDEBUG_ABORT) | |
2369 | /* KLL */ | |
2370 | else if (prev == tmp) | |
2371 | printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no); | |
2372 | #endif | |
2373 | ||
2374 | /* | |
2375 | * Case 3 : If any commands are connected, we're going to fail the abort | |
2376 | * and let the high level SCSI driver retry at a later time or | |
2377 | * issue a reset. | |
2378 | * | |
2379 | * Timeouts, and therefore aborted commands, will be highly unlikely | |
2380 | * and handling them cleanly in this situation would make the common | |
2381 | * case of noresets less efficient, and would pollute our code. So, | |
2382 | * we fail. | |
2383 | */ | |
2384 | ||
2385 | if (hostdata->connected) { | |
9dafbd93 | 2386 | spin_unlock_irq(instance->host_lock); |
52a6a1cb | 2387 | dprintk(NDEBUG_ABORT, "scsi%d : abort failed, command connected.\n", instance->host_no); |
1da177e4 LT |
2388 | return FAILED; |
2389 | } | |
2390 | /* | |
2391 | * Case 4: If the command is currently disconnected from the bus, and | |
2392 | * there are no connected commands, we reconnect the I_T_L or | |
2393 | * I_T_L_Q nexus associated with it, go into message out, and send | |
2394 | * an abort message. | |
2395 | * | |
2396 | * This case is especially ugly. In order to reestablish the nexus, we | |
2397 | * need to call NCR5380_select(). The easiest way to implement this | |
2398 | * function was to abort if the bus was busy, and let the interrupt | |
2399 | * handler triggered on the SEL for reselect take care of lost arbitrations | |
2400 | * where necessary, meaning interrupts need to be enabled. | |
2401 | * | |
2402 | * When interrupts are enabled, the queues may change - so we | |
2403 | * can't remove it from the disconnected queue before selecting it | |
2404 | * because that could cause a failure in hashing the nexus if that | |
2405 | * device reselected. | |
2406 | * | |
2407 | * Since the queues may change, we can't use the pointers from when we | |
2408 | * first locate it. | |
2409 | * | |
2410 | * So, we must first locate the command, and if NCR5380_select() | |
2411 | * succeeds, then issue the abort, relocate the command and remove | |
2412 | * it from the disconnected queue. | |
2413 | */ | |
2414 | ||
710ddd0d | 2415 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp; tmp = (struct scsi_cmnd *) tmp->host_scribble) |
1da177e4 | 2416 | if (cmd == tmp) { |
52a6a1cb | 2417 | dprintk(NDEBUG_ABORT, "scsi%d : aborting disconnected command.\n", instance->host_no); |
1da177e4 | 2418 | |
9dafbd93 FT |
2419 | if (NCR5380_select(instance, cmd)) { |
2420 | spin_unlock_irq(instance->host_lock); | |
1da177e4 | 2421 | return FAILED; |
9dafbd93 | 2422 | } |
52a6a1cb | 2423 | dprintk(NDEBUG_ABORT, "scsi%d : nexus reestablished.\n", instance->host_no); |
1da177e4 LT |
2424 | |
2425 | do_abort(instance); | |
2426 | ||
710ddd0d | 2427 | 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 |
2428 | if (cmd == tmp) { |
2429 | REMOVE(5, *prev, tmp, tmp->host_scribble); | |
710ddd0d | 2430 | *prev = (struct scsi_cmnd *) tmp->host_scribble; |
1da177e4 | 2431 | tmp->host_scribble = NULL; |
9dafbd93 | 2432 | spin_unlock_irq(instance->host_lock); |
1da177e4 | 2433 | tmp->result = DID_ABORT << 16; |
cce99c69 | 2434 | tmp->scsi_done(tmp); |
1da177e4 LT |
2435 | return SUCCESS; |
2436 | } | |
2437 | } | |
2438 | /* | |
2439 | * Case 5 : If we reached this point, the command was not found in any of | |
2440 | * the queues. | |
2441 | * | |
2442 | * We probably reached this point because of an unlikely race condition | |
2443 | * between the command completing successfully and the abortion code, | |
2444 | * so we won't panic, but we will notify the user in case something really | |
2445 | * broke. | |
2446 | */ | |
9dafbd93 | 2447 | spin_unlock_irq(instance->host_lock); |
1da177e4 LT |
2448 | printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n" |
2449 | " before abortion\n", instance->host_no); | |
2450 | return FAILED; | |
2451 | } | |
2452 | ||
2453 | ||
3be1b3ea FT |
2454 | /** |
2455 | * NCR5380_bus_reset - reset the SCSI bus | |
2456 | * @cmd: SCSI command undergoing EH | |
1da177e4 | 2457 | * |
3be1b3ea | 2458 | * Returns SUCCESS |
1da177e4 LT |
2459 | */ |
2460 | ||
710ddd0d | 2461 | static int NCR5380_bus_reset(struct scsi_cmnd *cmd) |
68b3aa7c JG |
2462 | { |
2463 | struct Scsi_Host *instance = cmd->device->host; | |
2464 | ||
3be1b3ea FT |
2465 | spin_lock_irq(instance->host_lock); |
2466 | ||
2467 | #if (NDEBUG & NDEBUG_ANY) | |
2468 | scmd_printk(KERN_INFO, cmd, "performing bus reset\n"); | |
68b3aa7c | 2469 | NCR5380_print_status(instance); |
3be1b3ea | 2470 | #endif |
68b3aa7c | 2471 | |
68b3aa7c | 2472 | do_reset(instance); |
3be1b3ea | 2473 | |
68b3aa7c | 2474 | spin_unlock_irq(instance->host_lock); |
1da177e4 | 2475 | |
1da177e4 LT |
2476 | return SUCCESS; |
2477 | } |