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 | ||
97 | #ifdef REAL_DMA_POLL | |
98 | #undef READ_OVERRUNS | |
99 | #define READ_OVERRUNS | |
100 | #endif | |
101 | ||
102 | #ifdef BOARD_REQUIRES_NO_DELAY | |
103 | #define io_recovery_delay(x) | |
104 | #else | |
105 | #define io_recovery_delay(x) udelay(x) | |
106 | #endif | |
107 | ||
108 | /* | |
109 | * Design | |
110 | * | |
111 | * This is a generic 5380 driver. To use it on a different platform, | |
112 | * one simply writes appropriate system specific macros (ie, data | |
113 | * transfer - some PC's will use the I/O bus, 68K's must use | |
114 | * memory mapped) and drops this file in their 'C' wrapper. | |
115 | * | |
116 | * (Note from hch: unfortunately it was not enough for the different | |
117 | * m68k folks and instead of improving this driver they copied it | |
118 | * and hacked it up for their needs. As a consequence they lost | |
119 | * most updates to this driver. Maybe someone will fix all these | |
120 | * drivers to use a common core one day..) | |
121 | * | |
122 | * As far as command queueing, two queues are maintained for | |
123 | * each 5380 in the system - commands that haven't been issued yet, | |
124 | * and commands that are currently executing. This means that an | |
125 | * unlimited number of commands may be queued, letting | |
126 | * more commands propagate from the higher driver levels giving higher | |
127 | * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, | |
128 | * allowing multiple commands to propagate all the way to a SCSI-II device | |
129 | * while a command is already executing. | |
130 | * | |
131 | * | |
132 | * Issues specific to the NCR5380 : | |
133 | * | |
134 | * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead | |
135 | * piece of hardware that requires you to sit in a loop polling for | |
136 | * the REQ signal as long as you are connected. Some devices are | |
137 | * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect | |
686f3990 | 138 | * while doing long seek operations. [...] These |
1da177e4 LT |
139 | * broken devices are the exception rather than the rule and I'd rather |
140 | * spend my time optimizing for the normal case. | |
141 | * | |
142 | * Architecture : | |
143 | * | |
144 | * At the heart of the design is a coroutine, NCR5380_main, | |
145 | * which is started from a workqueue for each NCR5380 host in the | |
146 | * system. It attempts to establish I_T_L or I_T_L_Q nexuses by | |
147 | * removing the commands from the issue queue and calling | |
148 | * NCR5380_select() if a nexus is not established. | |
149 | * | |
150 | * Once a nexus is established, the NCR5380_information_transfer() | |
151 | * phase goes through the various phases as instructed by the target. | |
152 | * if the target goes into MSG IN and sends a DISCONNECT message, | |
153 | * the command structure is placed into the per instance disconnected | |
154 | * queue, and NCR5380_main tries to find more work. If the target is | |
155 | * idle for too long, the system will try to sleep. | |
156 | * | |
157 | * If a command has disconnected, eventually an interrupt will trigger, | |
158 | * calling NCR5380_intr() which will in turn call NCR5380_reselect | |
159 | * to reestablish a nexus. This will run main if necessary. | |
160 | * | |
161 | * On command termination, the done function will be called as | |
162 | * appropriate. | |
163 | * | |
164 | * SCSI pointers are maintained in the SCp field of SCSI command | |
165 | * structures, being initialized after the command is connected | |
166 | * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. | |
167 | * Note that in violation of the standard, an implicit SAVE POINTERS operation | |
168 | * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. | |
169 | */ | |
170 | ||
171 | /* | |
172 | * Using this file : | |
173 | * This file a skeleton Linux SCSI driver for the NCR 5380 series | |
174 | * of chips. To use it, you write an architecture specific functions | |
175 | * and macros and include this file in your driver. | |
176 | * | |
177 | * These macros control options : | |
178 | * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be | |
179 | * defined. | |
180 | * | |
181 | * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically | |
182 | * for commands that return with a CHECK CONDITION status. | |
183 | * | |
184 | * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential | |
185 | * transceivers. | |
186 | * | |
187 | * DONT_USE_INTR - if defined, never use interrupts, even if we probe or | |
188 | * override-configure an IRQ. | |
189 | * | |
1da177e4 LT |
190 | * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases. |
191 | * | |
192 | * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. | |
193 | * | |
194 | * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't | |
195 | * rely on phase mismatch and EOP interrupts to determine end | |
196 | * of phase. | |
197 | * | |
1da177e4 LT |
198 | * Defaults for these will be provided although the user may want to adjust |
199 | * these to allocate CPU resources to the SCSI driver or "real" code. | |
200 | * | |
1da177e4 | 201 | * These macros MUST be defined : |
1da177e4 LT |
202 | * |
203 | * NCR5380_read(register) - read from the specified register | |
204 | * | |
205 | * NCR5380_write(register, value) - write to the specific register | |
206 | * | |
207 | * NCR5380_implementation_fields - additional fields needed for this | |
208 | * specific implementation of the NCR5380 | |
209 | * | |
210 | * Either real DMA *or* pseudo DMA may be implemented | |
211 | * REAL functions : | |
212 | * NCR5380_REAL_DMA should be defined if real DMA is to be used. | |
213 | * Note that the DMA setup functions should return the number of bytes | |
214 | * that they were able to program the controller for. | |
215 | * | |
216 | * Also note that generic i386/PC versions of these macros are | |
217 | * available as NCR5380_i386_dma_write_setup, | |
218 | * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. | |
219 | * | |
220 | * NCR5380_dma_write_setup(instance, src, count) - initialize | |
221 | * NCR5380_dma_read_setup(instance, dst, count) - initialize | |
222 | * NCR5380_dma_residual(instance); - residual count | |
223 | * | |
224 | * PSEUDO functions : | |
225 | * NCR5380_pwrite(instance, src, count) | |
226 | * NCR5380_pread(instance, dst, count); | |
227 | * | |
228 | * The generic driver is initialized by calling NCR5380_init(instance), | |
229 | * after setting the appropriate host specific fields and ID. If the | |
230 | * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, | |
231 | * possible) function may be used. | |
232 | */ | |
233 | ||
54d8fe44 FT |
234 | static int do_abort(struct Scsi_Host *); |
235 | static void do_reset(struct Scsi_Host *); | |
1da177e4 LT |
236 | |
237 | /* | |
238 | * initialize_SCp - init the scsi pointer field | |
239 | * @cmd: command block to set up | |
240 | * | |
241 | * Set up the internal fields in the SCSI command. | |
242 | */ | |
243 | ||
710ddd0d | 244 | static inline void initialize_SCp(struct scsi_cmnd *cmd) |
1da177e4 LT |
245 | { |
246 | /* | |
247 | * Initialize the Scsi Pointer field so that all of the commands in the | |
248 | * various queues are valid. | |
249 | */ | |
250 | ||
9e0fe44d BH |
251 | if (scsi_bufflen(cmd)) { |
252 | cmd->SCp.buffer = scsi_sglist(cmd); | |
253 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; | |
45711f1a | 254 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
1da177e4 LT |
255 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
256 | } else { | |
257 | cmd->SCp.buffer = NULL; | |
258 | cmd->SCp.buffers_residual = 0; | |
9e0fe44d BH |
259 | cmd->SCp.ptr = NULL; |
260 | cmd->SCp.this_residual = 0; | |
1da177e4 LT |
261 | } |
262 | } | |
263 | ||
264 | /** | |
b32ade12 | 265 | * NCR5380_poll_politely2 - wait for two chip register values |
2f854b82 | 266 | * @instance: controller to poll |
b32ade12 FT |
267 | * @reg1: 5380 register to poll |
268 | * @bit1: Bitmask to check | |
269 | * @val1: Expected value | |
270 | * @reg2: Second 5380 register to poll | |
271 | * @bit2: Second bitmask to check | |
272 | * @val2: Second expected value | |
2f854b82 FT |
273 | * @wait: Time-out in jiffies |
274 | * | |
275 | * Polls the chip in a reasonably efficient manner waiting for an | |
276 | * event to occur. After a short quick poll we begin to yield the CPU | |
277 | * (if possible). In irq contexts the time-out is arbitrarily limited. | |
278 | * Callers may hold locks as long as they are held in irq mode. | |
279 | * | |
b32ade12 | 280 | * Returns 0 if either or both event(s) occurred otherwise -ETIMEDOUT. |
1da177e4 | 281 | */ |
2f854b82 | 282 | |
b32ade12 FT |
283 | static int NCR5380_poll_politely2(struct Scsi_Host *instance, |
284 | int reg1, int bit1, int val1, | |
285 | int reg2, int bit2, int val2, int wait) | |
1da177e4 | 286 | { |
2f854b82 FT |
287 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
288 | unsigned long deadline = jiffies + wait; | |
289 | unsigned long n; | |
290 | ||
291 | /* Busy-wait for up to 10 ms */ | |
292 | n = min(10000U, jiffies_to_usecs(wait)); | |
293 | n *= hostdata->accesses_per_ms; | |
b32ade12 | 294 | n /= 2000; |
2f854b82 | 295 | do { |
b32ade12 FT |
296 | if ((NCR5380_read(reg1) & bit1) == val1) |
297 | return 0; | |
298 | if ((NCR5380_read(reg2) & bit2) == val2) | |
1da177e4 LT |
299 | return 0; |
300 | cpu_relax(); | |
2f854b82 FT |
301 | } while (n--); |
302 | ||
303 | if (irqs_disabled() || in_interrupt()) | |
304 | return -ETIMEDOUT; | |
305 | ||
306 | /* Repeatedly sleep for 1 ms until deadline */ | |
307 | while (time_is_after_jiffies(deadline)) { | |
308 | schedule_timeout_uninterruptible(1); | |
b32ade12 FT |
309 | if ((NCR5380_read(reg1) & bit1) == val1) |
310 | return 0; | |
311 | if ((NCR5380_read(reg2) & bit2) == val2) | |
1da177e4 | 312 | return 0; |
1da177e4 | 313 | } |
2f854b82 | 314 | |
1da177e4 LT |
315 | return -ETIMEDOUT; |
316 | } | |
317 | ||
b32ade12 FT |
318 | static inline int NCR5380_poll_politely(struct Scsi_Host *instance, |
319 | int reg, int bit, int val, int wait) | |
320 | { | |
321 | return NCR5380_poll_politely2(instance, reg, bit, val, | |
322 | reg, bit, val, wait); | |
323 | } | |
324 | ||
1da177e4 LT |
325 | static struct { |
326 | unsigned char value; | |
327 | const char *name; | |
702809ce | 328 | } phases[] __maybe_unused = { |
1da177e4 LT |
329 | {PHASE_DATAOUT, "DATAOUT"}, |
330 | {PHASE_DATAIN, "DATAIN"}, | |
331 | {PHASE_CMDOUT, "CMDOUT"}, | |
332 | {PHASE_STATIN, "STATIN"}, | |
333 | {PHASE_MSGOUT, "MSGOUT"}, | |
334 | {PHASE_MSGIN, "MSGIN"}, | |
335 | {PHASE_UNKNOWN, "UNKNOWN"} | |
336 | }; | |
337 | ||
185a7a1c | 338 | #if NDEBUG |
1da177e4 LT |
339 | static struct { |
340 | unsigned char mask; | |
341 | const char *name; | |
342 | } signals[] = { | |
343 | {SR_DBP, "PARITY"}, | |
344 | {SR_RST, "RST"}, | |
345 | {SR_BSY, "BSY"}, | |
346 | {SR_REQ, "REQ"}, | |
347 | {SR_MSG, "MSG"}, | |
348 | {SR_CD, "CD"}, | |
349 | {SR_IO, "IO"}, | |
350 | {SR_SEL, "SEL"}, | |
351 | {0, NULL} | |
352 | }, | |
353 | basrs[] = { | |
354 | {BASR_ATN, "ATN"}, | |
355 | {BASR_ACK, "ACK"}, | |
356 | {0, NULL} | |
357 | }, | |
358 | icrs[] = { | |
359 | {ICR_ASSERT_RST, "ASSERT RST"}, | |
360 | {ICR_ASSERT_ACK, "ASSERT ACK"}, | |
361 | {ICR_ASSERT_BSY, "ASSERT BSY"}, | |
362 | {ICR_ASSERT_SEL, "ASSERT SEL"}, | |
363 | {ICR_ASSERT_ATN, "ASSERT ATN"}, | |
364 | {ICR_ASSERT_DATA, "ASSERT DATA"}, | |
365 | {0, NULL} | |
366 | }, | |
367 | mrs[] = { | |
368 | {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, | |
369 | {MR_TARGET, "MODE TARGET"}, | |
370 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, | |
371 | {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"}, | |
372 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, | |
373 | {MR_DMA_MODE, "MODE DMA"}, | |
374 | {MR_ARBITRATE, "MODE ARBITRATION"}, | |
375 | {0, NULL} | |
376 | }; | |
377 | ||
378 | /** | |
379 | * NCR5380_print - print scsi bus signals | |
380 | * @instance: adapter state to dump | |
381 | * | |
382 | * Print the SCSI bus signals for debugging purposes | |
383 | * | |
384 | * Locks: caller holds hostdata lock (not essential) | |
385 | */ | |
386 | ||
387 | static void NCR5380_print(struct Scsi_Host *instance) | |
388 | { | |
1da177e4 | 389 | unsigned char status, data, basr, mr, icr, i; |
1da177e4 LT |
390 | |
391 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
392 | status = NCR5380_read(STATUS_REG); | |
393 | mr = NCR5380_read(MODE_REG); | |
394 | icr = NCR5380_read(INITIATOR_COMMAND_REG); | |
395 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
396 | ||
397 | printk("STATUS_REG: %02x ", status); | |
398 | for (i = 0; signals[i].mask; ++i) | |
399 | if (status & signals[i].mask) | |
400 | printk(",%s", signals[i].name); | |
401 | printk("\nBASR: %02x ", basr); | |
402 | for (i = 0; basrs[i].mask; ++i) | |
403 | if (basr & basrs[i].mask) | |
404 | printk(",%s", basrs[i].name); | |
405 | printk("\nICR: %02x ", icr); | |
406 | for (i = 0; icrs[i].mask; ++i) | |
407 | if (icr & icrs[i].mask) | |
408 | printk(",%s", icrs[i].name); | |
409 | printk("\nMODE: %02x ", mr); | |
410 | for (i = 0; mrs[i].mask; ++i) | |
411 | if (mr & mrs[i].mask) | |
412 | printk(",%s", mrs[i].name); | |
413 | printk("\n"); | |
414 | } | |
415 | ||
416 | ||
417 | /* | |
418 | * NCR5380_print_phase - show SCSI phase | |
419 | * @instance: adapter to dump | |
420 | * | |
421 | * Print the current SCSI phase for debugging purposes | |
422 | * | |
423 | * Locks: none | |
424 | */ | |
425 | ||
426 | static void NCR5380_print_phase(struct Scsi_Host *instance) | |
427 | { | |
1da177e4 LT |
428 | unsigned char status; |
429 | int i; | |
1da177e4 LT |
430 | |
431 | status = NCR5380_read(STATUS_REG); | |
432 | if (!(status & SR_REQ)) | |
433 | printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no); | |
434 | else { | |
435 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i); | |
436 | printk("scsi%d : phase %s\n", instance->host_no, phases[i].name); | |
437 | } | |
438 | } | |
439 | #endif | |
440 | ||
1da177e4 | 441 | |
d5f7e65d | 442 | static int probe_irq __initdata; |
1da177e4 LT |
443 | |
444 | /** | |
445 | * probe_intr - helper for IRQ autoprobe | |
446 | * @irq: interrupt number | |
447 | * @dev_id: unused | |
448 | * @regs: unused | |
449 | * | |
450 | * Set a flag to indicate the IRQ in question was received. This is | |
451 | * used by the IRQ probe code. | |
452 | */ | |
453 | ||
7d12e780 | 454 | static irqreturn_t __init probe_intr(int irq, void *dev_id) |
1da177e4 LT |
455 | { |
456 | probe_irq = irq; | |
457 | return IRQ_HANDLED; | |
458 | } | |
459 | ||
460 | /** | |
461 | * NCR5380_probe_irq - find the IRQ of an NCR5380 | |
462 | * @instance: NCR5380 controller | |
463 | * @possible: bitmask of ISA IRQ lines | |
464 | * | |
465 | * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ | |
466 | * and then looking to see what interrupt actually turned up. | |
467 | * | |
468 | * Locks: none, irqs must be enabled on entry | |
469 | */ | |
470 | ||
702809ce AM |
471 | static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance, |
472 | int possible) | |
1da177e4 | 473 | { |
1da177e4 LT |
474 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
475 | unsigned long timeout; | |
476 | int trying_irqs, i, mask; | |
1da177e4 | 477 | |
22f5f10d | 478 | for (trying_irqs = 0, i = 1, mask = 2; i < 16; ++i, mask <<= 1) |
4909cc2b | 479 | if ((mask & possible) && (request_irq(i, &probe_intr, 0, "NCR-probe", NULL) == 0)) |
1da177e4 LT |
480 | trying_irqs |= mask; |
481 | ||
4e5a800c | 482 | timeout = jiffies + msecs_to_jiffies(250); |
22f5f10d | 483 | probe_irq = NO_IRQ; |
1da177e4 LT |
484 | |
485 | /* | |
486 | * A interrupt is triggered whenever BSY = false, SEL = true | |
487 | * and a bit set in the SELECT_ENABLE_REG is asserted on the | |
488 | * SCSI bus. | |
489 | * | |
490 | * Note that the bus is only driven when the phase control signals | |
491 | * (I/O, C/D, and MSG) match those in the TCR, so we must reset that | |
492 | * to zero. | |
493 | */ | |
494 | ||
495 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
496 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
497 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); | |
498 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL); | |
499 | ||
22f5f10d | 500 | while (probe_irq == NO_IRQ && time_before(jiffies, timeout)) |
a9a3047d | 501 | schedule_timeout_uninterruptible(1); |
1da177e4 LT |
502 | |
503 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
504 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
505 | ||
22f5f10d | 506 | for (i = 1, mask = 2; i < 16; ++i, mask <<= 1) |
1da177e4 LT |
507 | if (trying_irqs & mask) |
508 | free_irq(i, NULL); | |
509 | ||
510 | return probe_irq; | |
511 | } | |
512 | ||
513 | /** | |
8c32513b FT |
514 | * NCR58380_info - report driver and host information |
515 | * @instance: relevant scsi host instance | |
1da177e4 | 516 | * |
8c32513b | 517 | * For use as the host template info() handler. |
1da177e4 LT |
518 | * |
519 | * Locks: none | |
520 | */ | |
521 | ||
8c32513b | 522 | static const char *NCR5380_info(struct Scsi_Host *instance) |
1da177e4 | 523 | { |
8c32513b FT |
524 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
525 | ||
526 | return hostdata->info; | |
527 | } | |
528 | ||
529 | static void prepare_info(struct Scsi_Host *instance) | |
530 | { | |
531 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
532 | ||
533 | snprintf(hostdata->info, sizeof(hostdata->info), | |
534 | "%s, io_port 0x%lx, n_io_port %d, " | |
535 | "base 0x%lx, irq %d, " | |
536 | "can_queue %d, cmd_per_lun %d, " | |
537 | "sg_tablesize %d, this_id %d, " | |
9c3f0e2b | 538 | "flags { %s%s%s%s}, " |
8c32513b FT |
539 | "options { %s} ", |
540 | instance->hostt->name, instance->io_port, instance->n_io_port, | |
541 | instance->base, instance->irq, | |
542 | instance->can_queue, instance->cmd_per_lun, | |
543 | instance->sg_tablesize, instance->this_id, | |
55181be8 | 544 | hostdata->flags & FLAG_NO_DMA_FIXUP ? "NO_DMA_FIXUP " : "", |
8c32513b FT |
545 | hostdata->flags & FLAG_DTC3181E ? "DTC3181E " : "", |
546 | hostdata->flags & FLAG_NO_PSEUDO_DMA ? "NO_PSEUDO_DMA " : "", | |
9c3f0e2b | 547 | hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "", |
1da177e4 | 548 | #ifdef AUTOPROBE_IRQ |
8c32513b | 549 | "AUTOPROBE_IRQ " |
1da177e4 | 550 | #endif |
1da177e4 | 551 | #ifdef DIFFERENTIAL |
8c32513b | 552 | "DIFFERENTIAL " |
1da177e4 LT |
553 | #endif |
554 | #ifdef REAL_DMA | |
8c32513b | 555 | "REAL_DMA " |
1da177e4 LT |
556 | #endif |
557 | #ifdef REAL_DMA_POLL | |
8c32513b | 558 | "REAL_DMA_POLL " |
1da177e4 LT |
559 | #endif |
560 | #ifdef PARITY | |
8c32513b | 561 | "PARITY " |
1da177e4 LT |
562 | #endif |
563 | #ifdef PSEUDO_DMA | |
8c32513b | 564 | "PSEUDO_DMA " |
8c32513b FT |
565 | #endif |
566 | ""); | |
1da177e4 LT |
567 | } |
568 | ||
569 | /** | |
570 | * NCR5380_print_status - dump controller info | |
571 | * @instance: controller to dump | |
572 | * | |
573 | * Print commands in the various queues, called from NCR5380_abort | |
574 | * and NCR5380_debug to aid debugging. | |
575 | * | |
576 | * Locks: called functions disable irqs | |
577 | */ | |
578 | ||
3be1b3ea | 579 | static void __maybe_unused NCR5380_print_status(struct Scsi_Host *instance) |
1da177e4 LT |
580 | { |
581 | NCR5380_dprint(NDEBUG_ANY, instance); | |
582 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
583 | } | |
584 | ||
a9c2dc43 | 585 | #ifdef PSEUDO_DMA |
1da177e4 LT |
586 | /******************************************/ |
587 | /* | |
588 | * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED] | |
589 | * | |
590 | * *buffer: I/O buffer | |
591 | * **start: if inout == FALSE pointer into buffer where user read should start | |
592 | * offset: current offset | |
593 | * length: length of buffer | |
594 | * hostno: Scsi_Host host_no | |
595 | * inout: TRUE - user is writing; FALSE - user is reading | |
596 | * | |
597 | * Return the number of bytes read from or written | |
598 | */ | |
599 | ||
dd7ab71b AV |
600 | static int __maybe_unused NCR5380_write_info(struct Scsi_Host *instance, |
601 | char *buffer, int length) | |
602 | { | |
a9c2dc43 FT |
603 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
604 | ||
605 | hostdata->spin_max_r = 0; | |
606 | hostdata->spin_max_w = 0; | |
607 | return 0; | |
dd7ab71b | 608 | } |
a9c2dc43 | 609 | #endif |
dd7ab71b | 610 | |
1da177e4 | 611 | static |
710ddd0d | 612 | void lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, struct seq_file *m); |
1da177e4 | 613 | static |
dd7ab71b | 614 | void lprint_command(unsigned char *cmd, struct seq_file *m); |
1da177e4 | 615 | static |
dd7ab71b | 616 | void lprint_opcode(int opcode, struct seq_file *m); |
1da177e4 | 617 | |
dd7ab71b AV |
618 | static int __maybe_unused NCR5380_show_info(struct seq_file *m, |
619 | struct Scsi_Host *instance) | |
1da177e4 | 620 | { |
1da177e4 | 621 | struct NCR5380_hostdata *hostdata; |
710ddd0d | 622 | struct scsi_cmnd *ptr; |
1da177e4 LT |
623 | |
624 | hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
625 | ||
a9c2dc43 | 626 | #ifdef PSEUDO_DMA |
0c3de38f | 627 | seq_printf(m, "Highwater I/O busy spin counts: write %d, read %d\n", |
a9c2dc43 | 628 | hostdata->spin_max_w, hostdata->spin_max_r); |
1da177e4 LT |
629 | #endif |
630 | spin_lock_irq(instance->host_lock); | |
631 | if (!hostdata->connected) | |
0c3de38f | 632 | seq_printf(m, "scsi%d: no currently connected command\n", instance->host_no); |
1da177e4 | 633 | else |
710ddd0d | 634 | lprint_Scsi_Cmnd((struct scsi_cmnd *) hostdata->connected, m); |
0c3de38f | 635 | seq_printf(m, "scsi%d: issue_queue\n", instance->host_no); |
710ddd0d | 636 | for (ptr = (struct scsi_cmnd *) hostdata->issue_queue; ptr; ptr = (struct scsi_cmnd *) ptr->host_scribble) |
dd7ab71b | 637 | lprint_Scsi_Cmnd(ptr, m); |
1da177e4 | 638 | |
0c3de38f | 639 | seq_printf(m, "scsi%d: disconnected_queue\n", instance->host_no); |
710ddd0d | 640 | for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr; ptr = (struct scsi_cmnd *) ptr->host_scribble) |
dd7ab71b | 641 | lprint_Scsi_Cmnd(ptr, m); |
1da177e4 | 642 | spin_unlock_irq(instance->host_lock); |
dd7ab71b | 643 | return 0; |
1da177e4 LT |
644 | } |
645 | ||
710ddd0d | 646 | static void lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, struct seq_file *m) |
1da177e4 | 647 | { |
0c3de38f | 648 | seq_printf(m, "scsi%d : destination target %d, lun %llu\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun); |
91c40f24 | 649 | seq_puts(m, " command = "); |
dd7ab71b | 650 | lprint_command(cmd->cmnd, m); |
1da177e4 LT |
651 | } |
652 | ||
dd7ab71b | 653 | static void lprint_command(unsigned char *command, struct seq_file *m) |
1da177e4 LT |
654 | { |
655 | int i, s; | |
dd7ab71b | 656 | lprint_opcode(command[0], m); |
1da177e4 | 657 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) |
0c3de38f | 658 | seq_printf(m, "%02x ", command[i]); |
f50332ff | 659 | seq_putc(m, '\n'); |
1da177e4 LT |
660 | } |
661 | ||
dd7ab71b | 662 | static void lprint_opcode(int opcode, struct seq_file *m) |
1da177e4 | 663 | { |
0c3de38f | 664 | seq_printf(m, "%2d (0x%02x)", opcode, opcode); |
1da177e4 LT |
665 | } |
666 | ||
667 | ||
668 | /** | |
669 | * NCR5380_init - initialise an NCR5380 | |
670 | * @instance: adapter to configure | |
671 | * @flags: control flags | |
672 | * | |
673 | * Initializes *instance and corresponding 5380 chip, | |
674 | * with flags OR'd into the initial flags value. | |
675 | * | |
676 | * Notes : I assume that the host, hostno, and id bits have been | |
677 | * set correctly. I don't care about the irq and other fields. | |
678 | * | |
679 | * Returns 0 for success | |
680 | * | |
681 | * Locks: interrupts must be enabled when we are called | |
682 | */ | |
683 | ||
6f039790 | 684 | static int NCR5380_init(struct Scsi_Host *instance, int flags) |
1da177e4 | 685 | { |
b6488f97 | 686 | int i; |
1da177e4 | 687 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
2f854b82 | 688 | unsigned long deadline; |
1da177e4 LT |
689 | |
690 | if(in_interrupt()) | |
691 | printk(KERN_ERR "NCR5380_init called with interrupts off!\n"); | |
1da177e4 | 692 | |
1da177e4 LT |
693 | hostdata->id_mask = 1 << instance->this_id; |
694 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) | |
695 | if (i > hostdata->id_mask) | |
696 | hostdata->id_higher_mask |= i; | |
697 | for (i = 0; i < 8; ++i) | |
698 | hostdata->busy[i] = 0; | |
699 | #ifdef REAL_DMA | |
700 | hostdata->dmalen = 0; | |
701 | #endif | |
1da177e4 LT |
702 | hostdata->connected = NULL; |
703 | hostdata->issue_queue = NULL; | |
704 | hostdata->disconnected_queue = NULL; | |
55181be8 | 705 | hostdata->flags = flags; |
1da177e4 | 706 | |
8d8601a7 | 707 | INIT_WORK(&hostdata->main_task, NCR5380_main); |
0ad0eff9 FT |
708 | hostdata->work_q = alloc_workqueue("ncr5380_%d", |
709 | WQ_UNBOUND | WQ_MEM_RECLAIM, | |
710 | 1, instance->host_no); | |
711 | if (!hostdata->work_q) | |
712 | return -ENOMEM; | |
713 | ||
1da177e4 | 714 | hostdata->host = instance; |
1da177e4 | 715 | |
8c32513b FT |
716 | prepare_info(instance); |
717 | ||
1da177e4 LT |
718 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
719 | NCR5380_write(MODE_REG, MR_BASE); | |
720 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
721 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
2f854b82 FT |
722 | |
723 | /* Calibrate register polling loop */ | |
724 | i = 0; | |
725 | deadline = jiffies + 1; | |
726 | do { | |
727 | cpu_relax(); | |
728 | } while (time_is_after_jiffies(deadline)); | |
729 | deadline += msecs_to_jiffies(256); | |
730 | do { | |
731 | NCR5380_read(STATUS_REG); | |
732 | ++i; | |
733 | cpu_relax(); | |
734 | } while (time_is_after_jiffies(deadline)); | |
735 | hostdata->accesses_per_ms = i / 256; | |
736 | ||
b6488f97 FT |
737 | return 0; |
738 | } | |
1da177e4 | 739 | |
b6488f97 FT |
740 | /** |
741 | * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems. | |
742 | * @instance: adapter to check | |
743 | * | |
744 | * If the system crashed, it may have crashed with a connected target and | |
745 | * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the | |
746 | * currently established nexus, which we know nothing about. Failing that | |
747 | * do a bus reset. | |
748 | * | |
749 | * Note that a bus reset will cause the chip to assert IRQ. | |
750 | * | |
751 | * Returns 0 if successful, otherwise -ENXIO. | |
752 | */ | |
753 | ||
754 | static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance) | |
755 | { | |
9c3f0e2b | 756 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
b6488f97 | 757 | int pass; |
1da177e4 LT |
758 | |
759 | for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { | |
760 | switch (pass) { | |
761 | case 1: | |
762 | case 3: | |
763 | case 5: | |
636b1ec8 FT |
764 | shost_printk(KERN_ERR, instance, "SCSI bus busy, waiting up to five seconds\n"); |
765 | NCR5380_poll_politely(instance, | |
766 | STATUS_REG, SR_BSY, 0, 5 * HZ); | |
1da177e4 LT |
767 | break; |
768 | case 2: | |
636b1ec8 | 769 | shost_printk(KERN_ERR, instance, "bus busy, attempting abort\n"); |
1da177e4 LT |
770 | do_abort(instance); |
771 | break; | |
772 | case 4: | |
636b1ec8 | 773 | shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n"); |
1da177e4 | 774 | do_reset(instance); |
9c3f0e2b FT |
775 | /* Wait after a reset; the SCSI standard calls for |
776 | * 250ms, we wait 500ms to be on the safe side. | |
777 | * But some Toshiba CD-ROMs need ten times that. | |
778 | */ | |
779 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) | |
780 | msleep(2500); | |
781 | else | |
782 | msleep(500); | |
1da177e4 LT |
783 | break; |
784 | case 6: | |
636b1ec8 | 785 | shost_printk(KERN_ERR, instance, "bus locked solid\n"); |
1da177e4 LT |
786 | return -ENXIO; |
787 | } | |
788 | } | |
789 | return 0; | |
790 | } | |
791 | ||
792 | /** | |
793 | * NCR5380_exit - remove an NCR5380 | |
794 | * @instance: adapter to remove | |
795 | */ | |
796 | ||
a43cf0f3 | 797 | static void NCR5380_exit(struct Scsi_Host *instance) |
1da177e4 LT |
798 | { |
799 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
800 | ||
8d8601a7 | 801 | cancel_work_sync(&hostdata->main_task); |
0ad0eff9 | 802 | destroy_workqueue(hostdata->work_q); |
1da177e4 LT |
803 | } |
804 | ||
805 | /** | |
1bb40589 FT |
806 | * NCR5380_queue_command - queue a command |
807 | * @instance: the relevant SCSI adapter | |
808 | * @cmd: SCSI command | |
1da177e4 | 809 | * |
1bb40589 FT |
810 | * cmd is added to the per-instance issue queue, with minor |
811 | * twiddling done to the host specific fields of cmd. If the | |
812 | * main coroutine is not running, it is restarted. | |
1da177e4 LT |
813 | */ |
814 | ||
1bb40589 FT |
815 | static int NCR5380_queue_command(struct Scsi_Host *instance, |
816 | struct scsi_cmnd *cmd) | |
1da177e4 | 817 | { |
1bb40589 | 818 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
710ddd0d | 819 | struct scsi_cmnd *tmp; |
1bb40589 | 820 | unsigned long flags; |
1da177e4 LT |
821 | |
822 | #if (NDEBUG & NDEBUG_NO_WRITE) | |
823 | switch (cmd->cmnd[0]) { | |
824 | case WRITE_6: | |
825 | case WRITE_10: | |
826 | printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no); | |
827 | cmd->result = (DID_ERROR << 16); | |
1bb40589 | 828 | cmd->scsi_done(cmd); |
1da177e4 LT |
829 | return 0; |
830 | } | |
831 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ | |
832 | ||
1da177e4 LT |
833 | /* |
834 | * We use the host_scribble field as a pointer to the next command | |
835 | * in a queue | |
836 | */ | |
837 | ||
838 | cmd->host_scribble = NULL; | |
1da177e4 LT |
839 | cmd->result = 0; |
840 | ||
1bb40589 FT |
841 | spin_lock_irqsave(instance->host_lock, flags); |
842 | ||
1da177e4 LT |
843 | /* |
844 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
845 | * commands are added to the head of the queue since any command will | |
846 | * clear the contingent allegiance condition that exists and the | |
847 | * sense data is only guaranteed to be valid while the condition exists. | |
848 | */ | |
849 | ||
850 | if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { | |
851 | LIST(cmd, hostdata->issue_queue); | |
852 | cmd->host_scribble = (unsigned char *) hostdata->issue_queue; | |
853 | hostdata->issue_queue = cmd; | |
854 | } else { | |
710ddd0d | 855 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (struct scsi_cmnd *) tmp->host_scribble); |
1da177e4 LT |
856 | LIST(cmd, tmp); |
857 | tmp->host_scribble = (unsigned char *) cmd; | |
858 | } | |
1bb40589 FT |
859 | spin_unlock_irqrestore(instance->host_lock, flags); |
860 | ||
52a6a1cb | 861 | dprintk(NDEBUG_QUEUES, "scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); |
1da177e4 | 862 | |
1da177e4 | 863 | /* Kick off command processing */ |
8d8601a7 | 864 | queue_work(hostdata->work_q, &hostdata->main_task); |
1da177e4 LT |
865 | return 0; |
866 | } | |
867 | ||
1da177e4 LT |
868 | /** |
869 | * NCR5380_main - NCR state machines | |
870 | * | |
871 | * NCR5380_main is a coroutine that runs as long as more work can | |
872 | * be done on the NCR5380 host adapters in a system. Both | |
873 | * NCR5380_queue_command() and NCR5380_intr() will try to start it | |
874 | * in case it is not running. | |
875 | * | |
876 | * Locks: called as its own thread with no locks held. Takes the | |
877 | * host lock and called routines may take the isa dma lock. | |
878 | */ | |
879 | ||
c4028958 | 880 | static void NCR5380_main(struct work_struct *work) |
1da177e4 | 881 | { |
c4028958 | 882 | struct NCR5380_hostdata *hostdata = |
8d8601a7 | 883 | container_of(work, struct NCR5380_hostdata, main_task); |
1da177e4 | 884 | struct Scsi_Host *instance = hostdata->host; |
710ddd0d | 885 | struct scsi_cmnd *tmp, *prev; |
1da177e4 LT |
886 | int done; |
887 | ||
888 | spin_lock_irq(instance->host_lock); | |
889 | do { | |
890 | /* Lock held here */ | |
891 | done = 1; | |
ae753a33 | 892 | if (!hostdata->connected) { |
52a6a1cb | 893 | dprintk(NDEBUG_MAIN, "scsi%d : not connected\n", instance->host_no); |
1da177e4 LT |
894 | /* |
895 | * Search through the issue_queue for a command destined | |
896 | * for a target that's not busy. | |
897 | */ | |
710ddd0d | 898 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (struct scsi_cmnd *) tmp->host_scribble) |
1da177e4 LT |
899 | { |
900 | if (prev != tmp) | |
9cb78c16 | 901 | 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 | 902 | /* When we find one, remove it from the issue queue. */ |
9cb78c16 HR |
903 | if (!(hostdata->busy[tmp->device->id] & |
904 | (1 << (u8)(tmp->device->lun & 0xff)))) { | |
1da177e4 LT |
905 | if (prev) { |
906 | REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); | |
907 | prev->host_scribble = tmp->host_scribble; | |
908 | } else { | |
909 | REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble); | |
710ddd0d | 910 | hostdata->issue_queue = (struct scsi_cmnd *) tmp->host_scribble; |
1da177e4 LT |
911 | } |
912 | tmp->host_scribble = NULL; | |
913 | ||
914 | /* | |
915 | * Attempt to establish an I_T_L nexus here. | |
916 | * On success, instance->hostdata->connected is set. | |
917 | * On failure, we must add the command back to the | |
918 | * issue queue so we can keep trying. | |
919 | */ | |
9cb78c16 | 920 | 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 | 921 | |
76f13b93 FT |
922 | /* |
923 | * REQUEST SENSE commands are issued without tagged | |
924 | * queueing, even on SCSI-II devices because the | |
925 | * contingent allegiance condition exists for the | |
926 | * entire unit. | |
927 | */ | |
928 | ||
929 | if (!NCR5380_select(instance, tmp)) { | |
1f1b0c74 | 930 | /* OK or bad target */ |
1da177e4 | 931 | } else { |
1f1b0c74 | 932 | /* Need to retry */ |
1da177e4 LT |
933 | LIST(tmp, hostdata->issue_queue); |
934 | tmp->host_scribble = (unsigned char *) hostdata->issue_queue; | |
935 | hostdata->issue_queue = tmp; | |
936 | done = 0; | |
52a6a1cb | 937 | dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, "scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no); |
1da177e4 | 938 | } |
ae753a33 | 939 | if (hostdata->connected) |
1f1b0c74 | 940 | break; |
1da177e4 LT |
941 | /* lock held here still */ |
942 | } /* if target/lun is not busy */ | |
943 | } /* for */ | |
944 | /* exited locked */ | |
945 | } /* if (!hostdata->connected) */ | |
1da177e4 LT |
946 | if (hostdata->connected |
947 | #ifdef REAL_DMA | |
948 | && !hostdata->dmalen | |
949 | #endif | |
1da177e4 | 950 | ) { |
52a6a1cb | 951 | dprintk(NDEBUG_MAIN, "scsi%d : main() : performing information transfer\n", instance->host_no); |
1da177e4 | 952 | NCR5380_information_transfer(instance); |
52a6a1cb | 953 | dprintk(NDEBUG_MAIN, "scsi%d : main() : done set false\n", instance->host_no); |
1da177e4 | 954 | done = 0; |
1d3db59d | 955 | } |
1da177e4 LT |
956 | } while (!done); |
957 | ||
958 | spin_unlock_irq(instance->host_lock); | |
959 | } | |
960 | ||
961 | #ifndef DONT_USE_INTR | |
962 | ||
963 | /** | |
cd400825 FT |
964 | * NCR5380_intr - generic NCR5380 irq handler |
965 | * @irq: interrupt number | |
966 | * @dev_id: device info | |
967 | * | |
968 | * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses | |
969 | * from the disconnected queue, and restarting NCR5380_main() | |
970 | * as required. | |
971 | * | |
972 | * The chip can assert IRQ in any of six different conditions. The IRQ flag | |
973 | * is then cleared by reading the Reset Parity/Interrupt Register (RPIR). | |
974 | * Three of these six conditions are latched in the Bus and Status Register: | |
975 | * - End of DMA (cleared by ending DMA Mode) | |
976 | * - Parity error (cleared by reading RPIR) | |
977 | * - Loss of BSY (cleared by reading RPIR) | |
978 | * Two conditions have flag bits that are not latched: | |
979 | * - Bus phase mismatch (non-maskable in DMA Mode, cleared by ending DMA Mode) | |
980 | * - Bus reset (non-maskable) | |
981 | * The remaining condition has no flag bit at all: | |
982 | * - Selection/reselection | |
983 | * | |
984 | * Hence, establishing the cause(s) of any interrupt is partly guesswork. | |
985 | * In "The DP8490 and DP5380 Comparison Guide", National Semiconductor | |
986 | * claimed that "the design of the [DP8490] interrupt logic ensures | |
987 | * interrupts will not be lost (they can be on the DP5380)." | |
988 | * The L5380/53C80 datasheet from LOGIC Devices has more details. | |
989 | * | |
990 | * Checking for bus reset by reading RST is futile because of interrupt | |
991 | * latency, but a bus reset will reset chip logic. Checking for parity error | |
992 | * is unnecessary because that interrupt is never enabled. A Loss of BSY | |
993 | * condition will clear DMA Mode. We can tell when this occurs because the | |
994 | * the Busy Monitor interrupt is enabled together with DMA Mode. | |
1da177e4 LT |
995 | */ |
996 | ||
cd400825 | 997 | static irqreturn_t NCR5380_intr(int irq, void *dev_id) |
1da177e4 | 998 | { |
baa9aac6 | 999 | struct Scsi_Host *instance = dev_id; |
cd400825 FT |
1000 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
1001 | int handled = 0; | |
1da177e4 LT |
1002 | unsigned char basr; |
1003 | unsigned long flags; | |
1004 | ||
cd400825 FT |
1005 | spin_lock_irqsave(instance->host_lock, flags); |
1006 | ||
1007 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
1008 | if (basr & BASR_IRQ) { | |
1009 | unsigned char mr = NCR5380_read(MODE_REG); | |
1010 | unsigned char sr = NCR5380_read(STATUS_REG); | |
1011 | ||
1012 | dprintk(NDEBUG_INTR, "scsi%d: IRQ %d, BASR 0x%02x, SR 0x%02x, MR 0x%02x\n", | |
1013 | instance->host_no, irq, basr, sr, mr); | |
1da177e4 | 1014 | |
1da177e4 | 1015 | #if defined(REAL_DMA) |
cd400825 FT |
1016 | if ((mr & MR_DMA_MODE) || (mr & MR_MONITOR_BSY)) { |
1017 | /* Probably End of DMA, Phase Mismatch or Loss of BSY. | |
1018 | * We ack IRQ after clearing Mode Register. Workarounds | |
1019 | * for End of DMA errata need to happen in DMA Mode. | |
1020 | */ | |
1da177e4 | 1021 | |
cd400825 | 1022 | dprintk(NDEBUG_INTR, "scsi%d: interrupt in DMA mode\n", intance->host_no); |
1da177e4 | 1023 | |
cd400825 | 1024 | int transferred; |
1da177e4 | 1025 | |
cd400825 FT |
1026 | if (!hostdata->connected) |
1027 | panic("scsi%d : DMA interrupt with no connected cmd\n", | |
1028 | instance->hostno); | |
1da177e4 | 1029 | |
cd400825 FT |
1030 | transferred = hostdata->dmalen - NCR5380_dma_residual(instance); |
1031 | hostdata->connected->SCp.this_residual -= transferred; | |
1032 | hostdata->connected->SCp.ptr += transferred; | |
1033 | hostdata->dmalen = 0; | |
1da177e4 | 1034 | |
cd400825 FT |
1035 | /* FIXME: we need to poll briefly then defer a workqueue task ! */ |
1036 | NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2 * HZ); | |
1037 | ||
1038 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1039 | NCR5380_write(MODE_REG, MR_BASE); | |
1040 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1041 | } else | |
1042 | #endif /* REAL_DMA */ | |
1043 | if ((NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_mask) && | |
1044 | (sr & (SR_SEL | SR_IO | SR_BSY | SR_RST)) == (SR_SEL | SR_IO)) { | |
1045 | /* Probably reselected */ | |
1046 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1047 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1048 | ||
1049 | dprintk(NDEBUG_INTR, "scsi%d: interrupt with SEL and IO\n", | |
1050 | instance->host_no); | |
1051 | ||
1052 | if (!hostdata->connected) { | |
1053 | NCR5380_reselect(instance); | |
1054 | queue_work(hostdata->work_q, &hostdata->main_task); | |
1da177e4 | 1055 | } |
cd400825 FT |
1056 | if (!hostdata->connected) |
1057 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1058 | } else { | |
1059 | /* Probably Bus Reset */ | |
1060 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1061 | ||
1062 | dprintk(NDEBUG_INTR, "scsi%d: unknown interrupt\n", instance->host_no); | |
1063 | } | |
1064 | handled = 1; | |
1065 | } else { | |
1066 | shost_printk(KERN_NOTICE, instance, "interrupt without IRQ bit\n"); | |
1067 | } | |
1068 | ||
1069 | spin_unlock_irqrestore(instance->host_lock, flags); | |
1070 | ||
1071 | return IRQ_RETVAL(handled); | |
1da177e4 LT |
1072 | } |
1073 | ||
1074 | #endif | |
1075 | ||
1da177e4 | 1076 | /* |
710ddd0d FT |
1077 | * Function : int NCR5380_select(struct Scsi_Host *instance, |
1078 | * struct scsi_cmnd *cmd) | |
1da177e4 LT |
1079 | * |
1080 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, | |
1081 | * including ARBITRATION, SELECTION, and initial message out for | |
1082 | * IDENTIFY and queue messages. | |
1083 | * | |
1084 | * Inputs : instance - instantiation of the 5380 driver on which this | |
76f13b93 | 1085 | * target lives, cmd - SCSI command to execute. |
1da177e4 | 1086 | * |
6323876f FT |
1087 | * Returns : -1 if selection failed but should be retried. |
1088 | * 0 if selection failed and should not be retried. | |
1089 | * 0 if selection succeeded completely (hostdata->connected == cmd). | |
1da177e4 LT |
1090 | * |
1091 | * Side effects : | |
1092 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit | |
1093 | * with registers as they should have been on entry - ie | |
1094 | * SELECT_ENABLE will be set appropriately, the NCR5380 | |
1095 | * will cease to drive any SCSI bus signals. | |
1096 | * | |
1097 | * If successful : I_T_L or I_T_L_Q nexus will be established, | |
1098 | * instance->connected will be set to cmd. | |
1099 | * SELECT interrupt will be disabled. | |
1100 | * | |
1101 | * If failed (no target) : cmd->scsi_done() will be called, and the | |
1102 | * cmd->result host byte set to DID_BAD_TARGET. | |
1103 | * | |
1104 | * Locks: caller holds hostdata lock in IRQ mode | |
1105 | */ | |
1106 | ||
710ddd0d | 1107 | static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd) |
1da177e4 | 1108 | { |
1da177e4 LT |
1109 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
1110 | unsigned char tmp[3], phase; | |
1111 | unsigned char *data; | |
1112 | int len; | |
1da177e4 | 1113 | int err; |
1da177e4 | 1114 | |
1da177e4 | 1115 | NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
52a6a1cb | 1116 | dprintk(NDEBUG_ARBITRATION, "scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id); |
1da177e4 LT |
1117 | |
1118 | /* | |
1119 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the | |
1120 | * data bus during SELECTION. | |
1121 | */ | |
1122 | ||
1123 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
1124 | ||
1125 | /* | |
1126 | * Start arbitration. | |
1127 | */ | |
1128 | ||
1129 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); | |
1130 | NCR5380_write(MODE_REG, MR_ARBITRATE); | |
1131 | ||
55500d9b FT |
1132 | /* The chip now waits for BUS FREE phase. Then after the 800 ns |
1133 | * Bus Free Delay, arbitration will begin. | |
1134 | */ | |
1da177e4 | 1135 | |
1da177e4 | 1136 | spin_unlock_irq(instance->host_lock); |
b32ade12 FT |
1137 | err = NCR5380_poll_politely2(instance, MODE_REG, MR_ARBITRATE, 0, |
1138 | INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, | |
1139 | ICR_ARBITRATION_PROGRESS, HZ); | |
1140 | spin_lock_irq(instance->host_lock); | |
1141 | if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) { | |
1142 | /* Reselection interrupt */ | |
1143 | return -1; | |
1144 | } | |
1145 | if (err < 0) { | |
1146 | NCR5380_write(MODE_REG, MR_BASE); | |
1147 | shost_printk(KERN_ERR, instance, | |
1148 | "select: arbitration timeout\n"); | |
1149 | return -1; | |
1da177e4 LT |
1150 | } |
1151 | ||
55500d9b | 1152 | /* The SCSI-2 arbitration delay is 2.4 us */ |
1da177e4 LT |
1153 | udelay(3); |
1154 | ||
1155 | /* Check for lost arbitration */ | |
1156 | 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)) { | |
1157 | NCR5380_write(MODE_REG, MR_BASE); | |
52a6a1cb | 1158 | dprintk(NDEBUG_ARBITRATION, "scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no); |
6323876f | 1159 | return -1; |
1da177e4 | 1160 | } |
cf13b083 FT |
1161 | |
1162 | /* After/during arbitration, BSY should be asserted. | |
1163 | * IBM DPES-31080 Version S31Q works now | |
1164 | * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) | |
1165 | */ | |
1166 | NCR5380_write(INITIATOR_COMMAND_REG, | |
1167 | ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY); | |
1da177e4 LT |
1168 | |
1169 | if (!(hostdata->flags & FLAG_DTC3181E) && | |
1170 | /* RvC: DTC3181E has some trouble with this | |
1171 | * so we simply removed it. Seems to work with | |
1172 | * only Mustek scanner attached | |
1173 | */ | |
1174 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { | |
1175 | NCR5380_write(MODE_REG, MR_BASE); | |
1176 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
52a6a1cb | 1177 | dprintk(NDEBUG_ARBITRATION, "scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no); |
6323876f | 1178 | return -1; |
1da177e4 LT |
1179 | } |
1180 | /* | |
1181 | * Again, bus clear + bus settle time is 1.2us, however, this is | |
1182 | * a minimum so we'll udelay ceil(1.2) | |
1183 | */ | |
1184 | ||
9c3f0e2b FT |
1185 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) |
1186 | udelay(15); | |
1187 | else | |
1188 | udelay(2); | |
1da177e4 | 1189 | |
52a6a1cb | 1190 | dprintk(NDEBUG_ARBITRATION, "scsi%d : won arbitration\n", instance->host_no); |
1da177e4 LT |
1191 | |
1192 | /* | |
1193 | * Now that we have won arbitration, start Selection process, asserting | |
1194 | * the host and target ID's on the SCSI bus. | |
1195 | */ | |
1196 | ||
422c0d61 | 1197 | NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd)))); |
1da177e4 LT |
1198 | |
1199 | /* | |
1200 | * Raise ATN while SEL is true before BSY goes false from arbitration, | |
1201 | * since this is the only way to guarantee that we'll get a MESSAGE OUT | |
1202 | * phase immediately after selection. | |
1203 | */ | |
1204 | ||
1205 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); | |
1206 | NCR5380_write(MODE_REG, MR_BASE); | |
1207 | ||
1208 | /* | |
1209 | * Reselect interrupts must be turned off prior to the dropping of BSY, | |
1210 | * otherwise we will trigger an interrupt. | |
1211 | */ | |
1212 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1213 | ||
1214 | /* | |
1215 | * The initiator shall then wait at least two deskew delays and release | |
1216 | * the BSY signal. | |
1217 | */ | |
1218 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ | |
1219 | ||
1220 | /* Reset BSY */ | |
1221 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); | |
1222 | ||
1223 | /* | |
1224 | * Something weird happens when we cease to drive BSY - looks | |
1225 | * like the board/chip is letting us do another read before the | |
1226 | * appropriate propagation delay has expired, and we're confusing | |
1227 | * a BSY signal from ourselves as the target's response to SELECTION. | |
1228 | * | |
1229 | * A small delay (the 'C++' frontend breaks the pipeline with an | |
1230 | * unnecessary jump, making it work on my 386-33/Trantor T128, the | |
1231 | * tighter 'C' code breaks and requires this) solves the problem - | |
1232 | * the 1 us delay is arbitrary, and only used because this delay will | |
1233 | * be the same on other platforms and since it works here, it should | |
1234 | * work there. | |
1235 | * | |
1236 | * wingel suggests that this could be due to failing to wait | |
1237 | * one deskew delay. | |
1238 | */ | |
1239 | ||
1240 | udelay(1); | |
1241 | ||
52a6a1cb | 1242 | dprintk(NDEBUG_SELECTION, "scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd)); |
1da177e4 LT |
1243 | |
1244 | /* | |
1245 | * The SCSI specification calls for a 250 ms timeout for the actual | |
1246 | * selection. | |
1247 | */ | |
1248 | ||
ae753a33 FT |
1249 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, SR_BSY, |
1250 | msecs_to_jiffies(250)); | |
1da177e4 | 1251 | |
1da177e4 LT |
1252 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { |
1253 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1254 | NCR5380_reselect(instance); | |
cd400825 FT |
1255 | if (!hostdata->connected) |
1256 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1da177e4 | 1257 | printk("scsi%d : reselection after won arbitration?\n", instance->host_no); |
1da177e4 LT |
1258 | return -1; |
1259 | } | |
ae753a33 FT |
1260 | |
1261 | if (err < 0) { | |
1262 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1263 | cmd->result = DID_BAD_TARGET << 16; | |
1264 | cmd->scsi_done(cmd); | |
1265 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1266 | dprintk(NDEBUG_SELECTION, "scsi%d : target did not respond within 250ms\n", | |
1267 | instance->host_no); | |
1268 | return 0; | |
1269 | } | |
1270 | ||
1da177e4 LT |
1271 | /* |
1272 | * No less than two deskew delays after the initiator detects the | |
1273 | * BSY signal is true, it shall release the SEL signal and may | |
1274 | * change the DATA BUS. -wingel | |
1275 | */ | |
1276 | ||
1277 | udelay(1); | |
1278 | ||
1279 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1280 | ||
1da177e4 LT |
1281 | /* |
1282 | * Since we followed the SCSI spec, and raised ATN while SEL | |
1283 | * was true but before BSY was false during selection, the information | |
1284 | * transfer phase should be a MESSAGE OUT phase so that we can send the | |
1285 | * IDENTIFY message. | |
1286 | * | |
1287 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG | |
1288 | * message (2 bytes) with a tag ID that we increment with every command | |
1289 | * until it wraps back to 0. | |
1290 | * | |
1291 | * XXX - it turns out that there are some broken SCSI-II devices, | |
1292 | * which claim to support tagged queuing but fail when more than | |
1293 | * some number of commands are issued at once. | |
1294 | */ | |
1295 | ||
1296 | /* Wait for start of REQ/ACK handshake */ | |
1297 | ||
1298 | spin_unlock_irq(instance->host_lock); | |
1299 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); | |
1300 | spin_lock_irq(instance->host_lock); | |
1cc160e1 | 1301 | if (err < 0) { |
55500d9b FT |
1302 | shost_printk(KERN_ERR, instance, "select: REQ timeout\n"); |
1303 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1da177e4 | 1304 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
6323876f | 1305 | return -1; |
1da177e4 LT |
1306 | } |
1307 | ||
52a6a1cb | 1308 | dprintk(NDEBUG_SELECTION, "scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id); |
22f5f10d | 1309 | tmp[0] = IDENTIFY(((instance->irq == NO_IRQ) ? 0 : 1), cmd->device->lun); |
1da177e4 LT |
1310 | |
1311 | len = 1; | |
1312 | cmd->tag = 0; | |
1313 | ||
1314 | /* Send message(s) */ | |
1315 | data = tmp; | |
1316 | phase = PHASE_MSGOUT; | |
1317 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
52a6a1cb | 1318 | dprintk(NDEBUG_SELECTION, "scsi%d : nexus established.\n", instance->host_no); |
1da177e4 LT |
1319 | /* XXX need to handle errors here */ |
1320 | hostdata->connected = cmd; | |
9cb78c16 | 1321 | hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF)); |
1da177e4 | 1322 | |
28424d3a | 1323 | initialize_SCp(cmd); |
1da177e4 LT |
1324 | |
1325 | return 0; | |
1da177e4 LT |
1326 | } |
1327 | ||
1328 | /* | |
1329 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, | |
1330 | * unsigned char *phase, int *count, unsigned char **data) | |
1331 | * | |
1332 | * Purpose : transfers data in given phase using polled I/O | |
1333 | * | |
1334 | * Inputs : instance - instance of driver, *phase - pointer to | |
1335 | * what phase is expected, *count - pointer to number of | |
1336 | * bytes to transfer, **data - pointer to data pointer. | |
1337 | * | |
1338 | * Returns : -1 when different phase is entered without transferring | |
25985edc | 1339 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1da177e4 LT |
1340 | * is in same phase. |
1341 | * | |
1342 | * Also, *phase, *count, *data are modified in place. | |
1343 | * | |
1344 | * XXX Note : handling for bus free may be useful. | |
1345 | */ | |
1346 | ||
1347 | /* | |
1348 | * Note : this code is not as quick as it could be, however it | |
1349 | * IS 100% reliable, and for the actual data transfer where speed | |
1350 | * counts, we will always do a pseudo DMA or DMA transfer. | |
1351 | */ | |
1352 | ||
1353 | static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { | |
1da177e4 LT |
1354 | unsigned char p = *phase, tmp; |
1355 | int c = *count; | |
1356 | unsigned char *d = *data; | |
1da177e4 LT |
1357 | |
1358 | if (!(p & SR_IO)) | |
52a6a1cb | 1359 | dprintk(NDEBUG_PIO, "scsi%d : pio write %d bytes\n", instance->host_no, c); |
1da177e4 | 1360 | else |
52a6a1cb | 1361 | dprintk(NDEBUG_PIO, "scsi%d : pio read %d bytes\n", instance->host_no, c); |
1da177e4 LT |
1362 | |
1363 | /* | |
1364 | * The NCR5380 chip will only drive the SCSI bus when the | |
1365 | * phase specified in the appropriate bits of the TARGET COMMAND | |
1366 | * REGISTER match the STATUS REGISTER | |
1367 | */ | |
1368 | ||
1369 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); | |
1370 | ||
1da177e4 LT |
1371 | do { |
1372 | /* | |
1373 | * Wait for assertion of REQ, after which the phase bits will be | |
1374 | * valid | |
1375 | */ | |
1376 | ||
686f3990 | 1377 | if (NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ) < 0) |
1da177e4 | 1378 | break; |
1da177e4 | 1379 | |
52a6a1cb | 1380 | dprintk(NDEBUG_HANDSHAKE, "scsi%d : REQ detected\n", instance->host_no); |
1da177e4 LT |
1381 | |
1382 | /* Check for phase mismatch */ | |
686f3990 | 1383 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) != p) { |
52a6a1cb | 1384 | dprintk(NDEBUG_HANDSHAKE, "scsi%d : phase mismatch\n", instance->host_no); |
1da177e4 LT |
1385 | NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance); |
1386 | break; | |
1387 | } | |
1388 | /* Do actual transfer from SCSI bus to / from memory */ | |
1389 | if (!(p & SR_IO)) | |
1390 | NCR5380_write(OUTPUT_DATA_REG, *d); | |
1391 | else | |
1392 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
1393 | ||
1394 | ++d; | |
1395 | ||
1396 | /* | |
1397 | * The SCSI standard suggests that in MSGOUT phase, the initiator | |
1398 | * should drop ATN on the last byte of the message phase | |
1399 | * after REQ has been asserted for the handshake but before | |
1400 | * the initiator raises ACK. | |
1401 | */ | |
1402 | ||
1403 | if (!(p & SR_IO)) { | |
1404 | if (!((p & SR_MSG) && c > 1)) { | |
1405 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1406 | NCR5380_dprint(NDEBUG_PIO, instance); | |
1407 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK); | |
1408 | } else { | |
1409 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN); | |
1410 | NCR5380_dprint(NDEBUG_PIO, instance); | |
1411 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1412 | } | |
1413 | } else { | |
1414 | NCR5380_dprint(NDEBUG_PIO, instance); | |
1415 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); | |
1416 | } | |
1417 | ||
a2edc4a6 FT |
1418 | if (NCR5380_poll_politely(instance, |
1419 | STATUS_REG, SR_REQ, 0, 5 * HZ) < 0) | |
1420 | break; | |
1421 | ||
52a6a1cb | 1422 | dprintk(NDEBUG_HANDSHAKE, "scsi%d : req false, handshake complete\n", instance->host_no); |
1da177e4 LT |
1423 | |
1424 | /* | |
1425 | * We have several special cases to consider during REQ/ACK handshaking : | |
1426 | * 1. We were in MSGOUT phase, and we are on the last byte of the | |
1427 | * message. ATN must be dropped as ACK is dropped. | |
1428 | * | |
1429 | * 2. We are in a MSGIN phase, and we are on the last byte of the | |
1430 | * message. We must exit with ACK asserted, so that the calling | |
1431 | * code may raise ATN before dropping ACK to reject the message. | |
1432 | * | |
1433 | * 3. ACK and ATN are clear and the target may proceed as normal. | |
1434 | */ | |
1435 | if (!(p == PHASE_MSGIN && c == 1)) { | |
1436 | if (p == PHASE_MSGOUT && c > 1) | |
1437 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1438 | else | |
1439 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1440 | } | |
1441 | } while (--c); | |
1442 | ||
52a6a1cb | 1443 | dprintk(NDEBUG_PIO, "scsi%d : residual %d\n", instance->host_no, c); |
1da177e4 LT |
1444 | |
1445 | *count = c; | |
1446 | *data = d; | |
1447 | tmp = NCR5380_read(STATUS_REG); | |
a2edc4a6 FT |
1448 | /* The phase read from the bus is valid if either REQ is (already) |
1449 | * asserted or if ACK hasn't been released yet. The latter applies if | |
1450 | * we're in MSG IN, DATA IN or STATUS and all bytes have been received. | |
1451 | */ | |
1452 | if ((tmp & SR_REQ) || ((tmp & SR_IO) && c == 0)) | |
1da177e4 LT |
1453 | *phase = tmp & PHASE_MASK; |
1454 | else | |
1455 | *phase = PHASE_UNKNOWN; | |
1456 | ||
1457 | if (!c || (*phase == p)) | |
1458 | return 0; | |
1459 | else | |
1460 | return -1; | |
1461 | } | |
1462 | ||
1463 | /** | |
636b1ec8 FT |
1464 | * do_reset - issue a reset command |
1465 | * @instance: adapter to reset | |
1da177e4 | 1466 | * |
636b1ec8 FT |
1467 | * Issue a reset sequence to the NCR5380 and try and get the bus |
1468 | * back into sane shape. | |
1da177e4 | 1469 | * |
636b1ec8 FT |
1470 | * This clears the reset interrupt flag because there may be no handler for |
1471 | * it. When the driver is initialized, the NCR5380_intr() handler has not yet | |
1472 | * been installed. And when in EH we may have released the ST DMA interrupt. | |
1da177e4 LT |
1473 | */ |
1474 | ||
54d8fe44 FT |
1475 | static void do_reset(struct Scsi_Host *instance) |
1476 | { | |
636b1ec8 FT |
1477 | unsigned long flags; |
1478 | ||
1479 | local_irq_save(flags); | |
1480 | NCR5380_write(TARGET_COMMAND_REG, | |
1481 | PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); | |
1da177e4 | 1482 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); |
636b1ec8 | 1483 | udelay(50); |
1da177e4 | 1484 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
636b1ec8 FT |
1485 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1486 | local_irq_restore(flags); | |
1da177e4 LT |
1487 | } |
1488 | ||
80d3eb6d FT |
1489 | /** |
1490 | * do_abort - abort the currently established nexus by going to | |
1491 | * MESSAGE OUT phase and sending an ABORT message. | |
1492 | * @instance: relevant scsi host instance | |
1da177e4 | 1493 | * |
80d3eb6d | 1494 | * Returns 0 on success, -1 on failure. |
1da177e4 LT |
1495 | */ |
1496 | ||
54d8fe44 FT |
1497 | static int do_abort(struct Scsi_Host *instance) |
1498 | { | |
1da177e4 LT |
1499 | unsigned char *msgptr, phase, tmp; |
1500 | int len; | |
1501 | int rc; | |
1da177e4 LT |
1502 | |
1503 | /* Request message out phase */ | |
1504 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1505 | ||
1506 | /* | |
1507 | * Wait for the target to indicate a valid phase by asserting | |
1508 | * REQ. Once this happens, we'll have either a MSGOUT phase | |
1509 | * and can immediately send the ABORT message, or we'll have some | |
1510 | * other phase and will have to source/sink data. | |
1511 | * | |
1512 | * We really don't care what value was on the bus or what value | |
1513 | * the target sees, so we just handshake. | |
1514 | */ | |
1515 | ||
80d3eb6d | 1516 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 10 * HZ); |
1cc160e1 | 1517 | if (rc < 0) |
80d3eb6d | 1518 | goto timeout; |
1da177e4 | 1519 | |
f35d3474 | 1520 | tmp = NCR5380_read(STATUS_REG) & PHASE_MASK; |
1da177e4 LT |
1521 | |
1522 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1523 | ||
f35d3474 | 1524 | if (tmp != PHASE_MSGOUT) { |
1da177e4 | 1525 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); |
54d8fe44 | 1526 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 3 * HZ); |
1cc160e1 | 1527 | if (rc < 0) |
80d3eb6d FT |
1528 | goto timeout; |
1529 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1da177e4 LT |
1530 | } |
1531 | tmp = ABORT; | |
1532 | msgptr = &tmp; | |
1533 | len = 1; | |
1534 | phase = PHASE_MSGOUT; | |
54d8fe44 | 1535 | NCR5380_transfer_pio(instance, &phase, &len, &msgptr); |
1da177e4 LT |
1536 | |
1537 | /* | |
1538 | * If we got here, and the command completed successfully, | |
1539 | * we're about to go into bus free state. | |
1540 | */ | |
1541 | ||
1542 | return len ? -1 : 0; | |
80d3eb6d FT |
1543 | |
1544 | timeout: | |
1545 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1546 | return -1; | |
1da177e4 LT |
1547 | } |
1548 | ||
1549 | #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL) | |
1550 | /* | |
1551 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, | |
1552 | * unsigned char *phase, int *count, unsigned char **data) | |
1553 | * | |
1554 | * Purpose : transfers data in given phase using either real | |
1555 | * or pseudo DMA. | |
1556 | * | |
1557 | * Inputs : instance - instance of driver, *phase - pointer to | |
1558 | * what phase is expected, *count - pointer to number of | |
1559 | * bytes to transfer, **data - pointer to data pointer. | |
1560 | * | |
1561 | * Returns : -1 when different phase is entered without transferring | |
25985edc | 1562 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1da177e4 LT |
1563 | * is in same phase. |
1564 | * | |
1565 | * Also, *phase, *count, *data are modified in place. | |
1566 | * | |
1567 | * Locks: io_request lock held by caller | |
1568 | */ | |
1569 | ||
1570 | ||
1571 | static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { | |
1da177e4 LT |
1572 | register int c = *count; |
1573 | register unsigned char p = *phase; | |
1574 | register unsigned char *d = *data; | |
1575 | unsigned char tmp; | |
1576 | int foo; | |
1577 | #if defined(REAL_DMA_POLL) | |
1578 | int cnt, toPIO; | |
1579 | unsigned char saved_data = 0, overrun = 0, residue; | |
1580 | #endif | |
1581 | ||
1582 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
1583 | ||
1da177e4 LT |
1584 | if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { |
1585 | *phase = tmp; | |
1586 | return -1; | |
1587 | } | |
1588 | #if defined(REAL_DMA) || defined(REAL_DMA_POLL) | |
1589 | #ifdef READ_OVERRUNS | |
1590 | if (p & SR_IO) { | |
1591 | c -= 2; | |
1592 | } | |
1593 | #endif | |
52a6a1cb | 1594 | 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 |
1595 | hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c); |
1596 | #endif | |
1597 | ||
1598 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); | |
1599 | ||
1600 | #ifdef REAL_DMA | |
cd400825 FT |
1601 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | |
1602 | MR_ENABLE_EOP_INTR); | |
1da177e4 | 1603 | #elif defined(REAL_DMA_POLL) |
cd400825 | 1604 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY); |
1da177e4 LT |
1605 | #else |
1606 | /* | |
1607 | * Note : on my sample board, watch-dog timeouts occurred when interrupts | |
1608 | * were not disabled for the duration of a single DMA transfer, from | |
1609 | * before the setting of DMA mode to after transfer of the last byte. | |
1610 | */ | |
1611 | ||
55181be8 | 1612 | if (hostdata->flags & FLAG_NO_DMA_FIXUP) |
cd400825 FT |
1613 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | |
1614 | MR_ENABLE_EOP_INTR); | |
1da177e4 | 1615 | else |
cd400825 | 1616 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY); |
1da177e4 LT |
1617 | #endif /* def REAL_DMA */ |
1618 | ||
52a6a1cb | 1619 | dprintk(NDEBUG_DMA, "scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG)); |
1da177e4 LT |
1620 | |
1621 | /* | |
1622 | * On the PAS16 at least I/O recovery delays are not needed here. | |
1623 | * Everyone else seems to want them. | |
1624 | */ | |
1625 | ||
1626 | if (p & SR_IO) { | |
1627 | io_recovery_delay(1); | |
1628 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); | |
1629 | } else { | |
1630 | io_recovery_delay(1); | |
1631 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1632 | io_recovery_delay(1); | |
1633 | NCR5380_write(START_DMA_SEND_REG, 0); | |
1634 | io_recovery_delay(1); | |
1635 | } | |
1636 | ||
1637 | #if defined(REAL_DMA_POLL) | |
1638 | do { | |
1639 | tmp = NCR5380_read(BUS_AND_STATUS_REG); | |
1640 | } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER))); | |
1641 | ||
1642 | /* | |
1643 | At this point, either we've completed DMA, or we have a phase mismatch, | |
1644 | or we've unexpectedly lost BUSY (which is a real error). | |
1645 | ||
1646 | For write DMAs, we want to wait until the last byte has been | |
1647 | transferred out over the bus before we turn off DMA mode. Alas, there | |
1648 | seems to be no terribly good way of doing this on a 5380 under all | |
1649 | conditions. For non-scatter-gather operations, we can wait until REQ | |
1650 | and ACK both go false, or until a phase mismatch occurs. Gather-writes | |
1651 | are nastier, since the device will be expecting more data than we | |
1652 | are prepared to send it, and REQ will remain asserted. On a 53C8[01] we | |
1653 | could test LAST BIT SENT to assure transfer (I imagine this is precisely | |
1654 | why this signal was added to the newer chips) but on the older 538[01] | |
1655 | this signal does not exist. The workaround for this lack is a watchdog; | |
1656 | we bail out of the wait-loop after a modest amount of wait-time if | |
1657 | the usual exit conditions are not met. Not a terribly clean or | |
1658 | correct solution :-% | |
1659 | ||
1660 | Reads are equally tricky due to a nasty characteristic of the NCR5380. | |
1661 | If the chip is in DMA mode for an READ, it will respond to a target's | |
1662 | REQ by latching the SCSI data into the INPUT DATA register and asserting | |
1663 | ACK, even if it has _already_ been notified by the DMA controller that | |
1664 | the current DMA transfer has completed! If the NCR5380 is then taken | |
1665 | out of DMA mode, this already-acknowledged byte is lost. | |
1666 | ||
1667 | This is not a problem for "one DMA transfer per command" reads, because | |
1668 | the situation will never arise... either all of the data is DMA'ed | |
1669 | properly, or the target switches to MESSAGE IN phase to signal a | |
1670 | disconnection (either operation bringing the DMA to a clean halt). | |
1671 | However, in order to handle scatter-reads, we must work around the | |
1672 | problem. The chosen fix is to DMA N-2 bytes, then check for the | |
1673 | condition before taking the NCR5380 out of DMA mode. One or two extra | |
1674 | bytes are transferred via PIO as necessary to fill out the original | |
1675 | request. | |
1676 | */ | |
1677 | ||
1678 | if (p & SR_IO) { | |
1679 | #ifdef READ_OVERRUNS | |
1680 | udelay(10); | |
1681 | if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) { | |
1682 | saved_data = NCR5380_read(INPUT_DATA_REGISTER); | |
1683 | overrun = 1; | |
1684 | } | |
1685 | #endif | |
1686 | } else { | |
1687 | int limit = 100; | |
1688 | while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) { | |
1689 | if (!(tmp & BASR_PHASE_MATCH)) | |
1690 | break; | |
1691 | if (--limit < 0) | |
1692 | break; | |
1693 | } | |
1694 | } | |
1695 | ||
52a6a1cb | 1696 | 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 |
1697 | |
1698 | NCR5380_write(MODE_REG, MR_BASE); | |
1699 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1700 | ||
1701 | residue = NCR5380_dma_residual(instance); | |
1702 | c -= residue; | |
1703 | *count -= c; | |
1704 | *data += c; | |
1705 | *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; | |
1706 | ||
1707 | #ifdef READ_OVERRUNS | |
1708 | if (*phase == p && (p & SR_IO) && residue == 0) { | |
1709 | if (overrun) { | |
52a6a1cb | 1710 | dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n"); |
1da177e4 LT |
1711 | **data = saved_data; |
1712 | *data += 1; | |
1713 | *count -= 1; | |
1714 | cnt = toPIO = 1; | |
1715 | } else { | |
1716 | printk("No overrun??\n"); | |
1717 | cnt = toPIO = 2; | |
1718 | } | |
52a6a1cb | 1719 | dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%X\n", cnt, *data); |
1da177e4 LT |
1720 | NCR5380_transfer_pio(instance, phase, &cnt, data); |
1721 | *count -= toPIO - cnt; | |
1722 | } | |
1723 | #endif | |
1724 | ||
52a6a1cb | 1725 | 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 |
1726 | return 0; |
1727 | ||
1728 | #elif defined(REAL_DMA) | |
1729 | return 0; | |
1730 | #else /* defined(REAL_DMA_POLL) */ | |
1731 | if (p & SR_IO) { | |
55181be8 FT |
1732 | foo = NCR5380_pread(instance, d, |
1733 | hostdata->flags & FLAG_NO_DMA_FIXUP ? c : c - 1); | |
1734 | if (!foo && !(hostdata->flags & FLAG_NO_DMA_FIXUP)) { | |
1da177e4 LT |
1735 | /* |
1736 | * We can't disable DMA mode after successfully transferring | |
1737 | * what we plan to be the last byte, since that would open up | |
1738 | * a race condition where if the target asserted REQ before | |
1739 | * we got the DMA mode reset, the NCR5380 would have latched | |
1740 | * an additional byte into the INPUT DATA register and we'd | |
1741 | * have dropped it. | |
1742 | * | |
1743 | * The workaround was to transfer one fewer bytes than we | |
1744 | * intended to with the pseudo-DMA read function, wait for | |
1745 | * the chip to latch the last byte, read it, and then disable | |
1746 | * pseudo-DMA mode. | |
1747 | * | |
1748 | * After REQ is asserted, the NCR5380 asserts DRQ and ACK. | |
1749 | * REQ is deasserted when ACK is asserted, and not reasserted | |
1750 | * until ACK goes false. Since the NCR5380 won't lower ACK | |
1751 | * until DACK is asserted, which won't happen unless we twiddle | |
1752 | * the DMA port or we take the NCR5380 out of DMA mode, we | |
1753 | * can guarantee that we won't handshake another extra | |
1754 | * byte. | |
1755 | */ | |
1756 | ||
55181be8 FT |
1757 | if (NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, |
1758 | BASR_DRQ, BASR_DRQ, HZ) < 0) { | |
1759 | foo = -1; | |
1760 | shost_printk(KERN_ERR, instance, "PDMA read: DRQ timeout\n"); | |
1761 | } | |
1762 | if (NCR5380_poll_politely(instance, STATUS_REG, | |
1763 | SR_REQ, 0, HZ) < 0) { | |
1764 | foo = -1; | |
1765 | shost_printk(KERN_ERR, instance, "PDMA read: !REQ timeout\n"); | |
1da177e4 | 1766 | } |
55181be8 | 1767 | d[c - 1] = NCR5380_read(INPUT_DATA_REG); |
1da177e4 | 1768 | } |
1da177e4 | 1769 | } else { |
1da177e4 | 1770 | foo = NCR5380_pwrite(instance, d, c); |
55181be8 | 1771 | if (!foo && !(hostdata->flags & FLAG_NO_DMA_FIXUP)) { |
1da177e4 LT |
1772 | /* |
1773 | * Wait for the last byte to be sent. If REQ is being asserted for | |
1774 | * the byte we're interested, we'll ACK it and it will go false. | |
1775 | */ | |
55181be8 FT |
1776 | if (NCR5380_poll_politely2(instance, |
1777 | BUS_AND_STATUS_REG, BASR_DRQ, BASR_DRQ, | |
1778 | BUS_AND_STATUS_REG, BASR_PHASE_MATCH, 0, HZ) < 0) { | |
1779 | foo = -1; | |
1780 | shost_printk(KERN_ERR, instance, "PDMA write: DRQ and phase timeout\n"); | |
1da177e4 LT |
1781 | } |
1782 | } | |
1da177e4 LT |
1783 | } |
1784 | NCR5380_write(MODE_REG, MR_BASE); | |
1785 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
cd400825 | 1786 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1da177e4 LT |
1787 | *data = d + c; |
1788 | *count = 0; | |
1789 | *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; | |
1da177e4 LT |
1790 | return foo; |
1791 | #endif /* def REAL_DMA */ | |
1792 | } | |
1793 | #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */ | |
1794 | ||
1795 | /* | |
1796 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) | |
1797 | * | |
1798 | * Purpose : run through the various SCSI phases and do as the target | |
1799 | * directs us to. Operates on the currently connected command, | |
1800 | * instance->connected. | |
1801 | * | |
1802 | * Inputs : instance, instance for which we are doing commands | |
1803 | * | |
1804 | * Side effects : SCSI things happen, the disconnected queue will be | |
1805 | * modified if a command disconnects, *instance->connected will | |
1806 | * change. | |
1807 | * | |
1808 | * XXX Note : we need to watch for bus free or a reset condition here | |
1809 | * to recover from an unexpected bus free condition. | |
1810 | * | |
1811 | * Locks: io_request_lock held by caller in IRQ mode | |
1812 | */ | |
1813 | ||
1814 | static void NCR5380_information_transfer(struct Scsi_Host *instance) { | |
1da177e4 LT |
1815 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata; |
1816 | unsigned char msgout = NOP; | |
1817 | int sink = 0; | |
1818 | int len; | |
1819 | #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) | |
1820 | int transfersize; | |
1821 | #endif | |
1822 | unsigned char *data; | |
1823 | unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; | |
710ddd0d | 1824 | struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected; |
1da177e4 | 1825 | |
1da177e4 LT |
1826 | while (1) { |
1827 | tmp = NCR5380_read(STATUS_REG); | |
1828 | /* We only have a valid SCSI phase when REQ is asserted */ | |
1829 | if (tmp & SR_REQ) { | |
1830 | phase = (tmp & PHASE_MASK); | |
1831 | if (phase != old_phase) { | |
1832 | old_phase = phase; | |
1833 | NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); | |
1834 | } | |
1835 | if (sink && (phase != PHASE_MSGOUT)) { | |
1836 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1837 | ||
1838 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1839 | while (NCR5380_read(STATUS_REG) & SR_REQ); | |
1840 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1841 | sink = 0; | |
1842 | continue; | |
1843 | } | |
1844 | switch (phase) { | |
1845 | case PHASE_DATAIN: | |
1846 | case PHASE_DATAOUT: | |
1847 | #if (NDEBUG & NDEBUG_NO_DATAOUT) | |
1848 | printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no); | |
1849 | sink = 1; | |
1850 | do_abort(instance); | |
1851 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 1852 | cmd->scsi_done(cmd); |
1da177e4 LT |
1853 | return; |
1854 | #endif | |
1855 | /* | |
1856 | * If there is no room left in the current buffer in the | |
1857 | * scatter-gather list, move onto the next one. | |
1858 | */ | |
1859 | ||
1860 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1861 | ++cmd->SCp.buffer; | |
1862 | --cmd->SCp.buffers_residual; | |
1863 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
45711f1a | 1864 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
52a6a1cb | 1865 | 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 |
1866 | } |
1867 | /* | |
1868 | * The preferred transfer method is going to be | |
1869 | * PSEUDO-DMA for systems that are strictly PIO, | |
1870 | * since we can let the hardware do the handshaking. | |
1871 | * | |
1872 | * For this to work, we need to know the transfersize | |
1873 | * ahead of time, since the pseudo-DMA code will sit | |
1874 | * in an unconditional loop. | |
1875 | */ | |
1876 | ||
1877 | #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) | |
ff3d4578 FT |
1878 | transfersize = 0; |
1879 | if (!cmd->device->borken && | |
1880 | !(hostdata->flags & FLAG_NO_PSEUDO_DMA)) | |
1881 | transfersize = NCR5380_dma_xfer_len(instance, cmd, phase); | |
1882 | ||
1883 | if (transfersize) { | |
1da177e4 LT |
1884 | len = transfersize; |
1885 | if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) { | |
1886 | /* | |
1887 | * If the watchdog timer fires, all future accesses to this | |
1888 | * device will use the polled-IO. | |
1889 | */ | |
017560fc JG |
1890 | scmd_printk(KERN_INFO, cmd, |
1891 | "switching to slow handshake\n"); | |
1da177e4 | 1892 | cmd->device->borken = 1; |
1da177e4 LT |
1893 | sink = 1; |
1894 | do_abort(instance); | |
1895 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 1896 | cmd->scsi_done(cmd); |
1da177e4 LT |
1897 | /* XXX - need to source or sink data here, as appropriate */ |
1898 | } else | |
1899 | cmd->SCp.this_residual -= transfersize - len; | |
1900 | } else | |
1901 | #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */ | |
1902 | NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **) | |
1903 | &cmd->SCp.ptr); | |
1904 | break; | |
1905 | case PHASE_MSGIN: | |
1906 | len = 1; | |
1907 | data = &tmp; | |
1908 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
1909 | cmd->SCp.Message = tmp; | |
1910 | ||
1911 | switch (tmp) { | |
1da177e4 LT |
1912 | case ABORT: |
1913 | case COMMAND_COMPLETE: | |
1914 | /* Accept message by clearing ACK */ | |
1915 | sink = 1; | |
1916 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1917 | hostdata->connected = NULL; | |
9cb78c16 HR |
1918 | dprintk(NDEBUG_QUEUES, "scsi%d : command for target %d, lun %llu completed\n", instance->host_no, cmd->device->id, cmd->device->lun); |
1919 | hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xFF)); | |
1da177e4 LT |
1920 | |
1921 | /* | |
1922 | * I'm not sure what the correct thing to do here is : | |
1923 | * | |
1924 | * If the command that just executed is NOT a request | |
1925 | * sense, the obvious thing to do is to set the result | |
1926 | * code to the values of the stored parameters. | |
1927 | * | |
1928 | * If it was a REQUEST SENSE command, we need some way | |
1929 | * to differentiate between the failure code of the original | |
1930 | * and the failure code of the REQUEST sense - the obvious | |
1931 | * case is success, where we fall through and leave the result | |
1932 | * code unchanged. | |
1933 | * | |
1934 | * The non-obvious place is where the REQUEST SENSE failed | |
1935 | */ | |
1936 | ||
1937 | if (cmd->cmnd[0] != REQUEST_SENSE) | |
1938 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | |
1939 | else if (status_byte(cmd->SCp.Status) != GOOD) | |
1940 | cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); | |
1941 | ||
28424d3a BH |
1942 | if ((cmd->cmnd[0] == REQUEST_SENSE) && |
1943 | hostdata->ses.cmd_len) { | |
1944 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
1945 | hostdata->ses.cmd_len = 0 ; | |
1946 | } | |
1947 | ||
1da177e4 | 1948 | if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { |
28424d3a BH |
1949 | scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); |
1950 | ||
52a6a1cb | 1951 | dprintk(NDEBUG_AUTOSENSE, "scsi%d : performing request sense\n", instance->host_no); |
1da177e4 LT |
1952 | |
1953 | LIST(cmd, hostdata->issue_queue); | |
1954 | cmd->host_scribble = (unsigned char *) | |
1955 | hostdata->issue_queue; | |
710ddd0d | 1956 | hostdata->issue_queue = (struct scsi_cmnd *) cmd; |
52a6a1cb | 1957 | dprintk(NDEBUG_QUEUES, "scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no); |
997acab7 | 1958 | } else { |
1da177e4 LT |
1959 | cmd->scsi_done(cmd); |
1960 | } | |
1961 | ||
1962 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1963 | /* | |
1964 | * Restore phase bits to 0 so an interrupted selection, | |
1965 | * arbitration can resume. | |
1966 | */ | |
1967 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
1da177e4 LT |
1968 | return; |
1969 | case MESSAGE_REJECT: | |
1970 | /* Accept message by clearing ACK */ | |
1971 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1972 | switch (hostdata->last_message) { | |
1973 | case HEAD_OF_QUEUE_TAG: | |
1974 | case ORDERED_QUEUE_TAG: | |
1975 | case SIMPLE_QUEUE_TAG: | |
1976 | cmd->device->simple_tags = 0; | |
9cb78c16 | 1977 | hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF)); |
1da177e4 LT |
1978 | break; |
1979 | default: | |
1980 | break; | |
1981 | } | |
340b9612 | 1982 | break; |
1da177e4 LT |
1983 | case DISCONNECT:{ |
1984 | /* Accept message by clearing ACK */ | |
1985 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1da177e4 LT |
1986 | LIST(cmd, hostdata->disconnected_queue); |
1987 | cmd->host_scribble = (unsigned char *) | |
1988 | hostdata->disconnected_queue; | |
1989 | hostdata->connected = NULL; | |
1990 | hostdata->disconnected_queue = cmd; | |
9cb78c16 | 1991 | 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 |
1992 | /* |
1993 | * Restore phase bits to 0 so an interrupted selection, | |
1994 | * arbitration can resume. | |
1995 | */ | |
1996 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
1997 | ||
1998 | /* Enable reselect interrupts */ | |
1999 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1da177e4 LT |
2000 | return; |
2001 | } | |
2002 | /* | |
2003 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect | |
2004 | * operation, in violation of the SCSI spec so we can safely | |
2005 | * ignore SAVE/RESTORE pointers calls. | |
2006 | * | |
2007 | * Unfortunately, some disks violate the SCSI spec and | |
2008 | * don't issue the required SAVE_POINTERS message before | |
2009 | * disconnecting, and we have to break spec to remain | |
2010 | * compatible. | |
2011 | */ | |
2012 | case SAVE_POINTERS: | |
2013 | case RESTORE_POINTERS: | |
2014 | /* Accept message by clearing ACK */ | |
2015 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2016 | break; | |
2017 | case EXTENDED_MESSAGE: | |
2018 | /* | |
2019 | * Extended messages are sent in the following format : | |
2020 | * Byte | |
2021 | * 0 EXTENDED_MESSAGE == 1 | |
2022 | * 1 length (includes one byte for code, doesn't | |
2023 | * include first two bytes) | |
2024 | * 2 code | |
2025 | * 3..length+1 arguments | |
2026 | * | |
2027 | * Start the extended message buffer with the EXTENDED_MESSAGE | |
1abfd370 | 2028 | * byte, since spi_print_msg() wants the whole thing. |
1da177e4 LT |
2029 | */ |
2030 | extended_msg[0] = EXTENDED_MESSAGE; | |
2031 | /* Accept first byte by clearing ACK */ | |
2032 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
52a6a1cb | 2033 | dprintk(NDEBUG_EXTENDED, "scsi%d : receiving extended message\n", instance->host_no); |
1da177e4 LT |
2034 | |
2035 | len = 2; | |
2036 | data = extended_msg + 1; | |
2037 | phase = PHASE_MSGIN; | |
2038 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2039 | ||
52a6a1cb | 2040 | dprintk(NDEBUG_EXTENDED, "scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2]); |
1da177e4 LT |
2041 | |
2042 | if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) { | |
2043 | /* Accept third byte by clearing ACK */ | |
2044 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2045 | len = extended_msg[1] - 1; | |
2046 | data = extended_msg + 3; | |
2047 | phase = PHASE_MSGIN; | |
2048 | ||
2049 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
52a6a1cb | 2050 | dprintk(NDEBUG_EXTENDED, "scsi%d : message received, residual %d\n", instance->host_no, len); |
1da177e4 LT |
2051 | |
2052 | switch (extended_msg[2]) { | |
2053 | case EXTENDED_SDTR: | |
2054 | case EXTENDED_WDTR: | |
2055 | case EXTENDED_MODIFY_DATA_POINTER: | |
2056 | case EXTENDED_EXTENDED_IDENTIFY: | |
2057 | tmp = 0; | |
2058 | } | |
2059 | } else if (len) { | |
2060 | printk("scsi%d: error receiving extended message\n", instance->host_no); | |
2061 | tmp = 0; | |
2062 | } else { | |
2063 | printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]); | |
2064 | tmp = 0; | |
2065 | } | |
2066 | /* Fall through to reject message */ | |
2067 | ||
2068 | /* | |
2069 | * If we get something weird that we aren't expecting, | |
2070 | * reject it. | |
2071 | */ | |
2072 | default: | |
2073 | if (!tmp) { | |
2074 | printk("scsi%d: rejecting message ", instance->host_no); | |
1abfd370 | 2075 | spi_print_msg(extended_msg); |
1da177e4 LT |
2076 | printk("\n"); |
2077 | } else if (tmp != EXTENDED_MESSAGE) | |
017560fc JG |
2078 | scmd_printk(KERN_INFO, cmd, |
2079 | "rejecting unknown message %02x\n",tmp); | |
1da177e4 | 2080 | else |
017560fc JG |
2081 | scmd_printk(KERN_INFO, cmd, |
2082 | "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]); | |
1da177e4 LT |
2083 | |
2084 | msgout = MESSAGE_REJECT; | |
2085 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
2086 | break; | |
2087 | } /* switch (tmp) */ | |
2088 | break; | |
2089 | case PHASE_MSGOUT: | |
2090 | len = 1; | |
2091 | data = &msgout; | |
2092 | hostdata->last_message = msgout; | |
2093 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2094 | if (msgout == ABORT) { | |
9cb78c16 | 2095 | hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xFF)); |
1da177e4 LT |
2096 | hostdata->connected = NULL; |
2097 | cmd->result = DID_ERROR << 16; | |
1da177e4 LT |
2098 | cmd->scsi_done(cmd); |
2099 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2100 | return; | |
2101 | } | |
2102 | msgout = NOP; | |
2103 | break; | |
2104 | case PHASE_CMDOUT: | |
2105 | len = cmd->cmd_len; | |
2106 | data = cmd->cmnd; | |
2107 | /* | |
2108 | * XXX for performance reasons, on machines with a | |
2109 | * PSEUDO-DMA architecture we should probably | |
2110 | * use the dma transfer function. | |
2111 | */ | |
2112 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
1da177e4 LT |
2113 | break; |
2114 | case PHASE_STATIN: | |
2115 | len = 1; | |
2116 | data = &tmp; | |
2117 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2118 | cmd->SCp.Status = tmp; | |
2119 | break; | |
2120 | default: | |
2121 | printk("scsi%d : unknown phase\n", instance->host_no); | |
4dde8f7d | 2122 | NCR5380_dprint(NDEBUG_ANY, instance); |
1da177e4 | 2123 | } /* switch(phase) */ |
686f3990 FT |
2124 | } else { |
2125 | spin_unlock_irq(instance->host_lock); | |
2126 | NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); | |
2127 | spin_lock_irq(instance->host_lock); | |
1da177e4 LT |
2128 | } |
2129 | } /* while (1) */ | |
2130 | } | |
2131 | ||
2132 | /* | |
2133 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) | |
2134 | * | |
2135 | * Purpose : does reselection, initializing the instance->connected | |
710ddd0d | 2136 | * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q |
1da177e4 LT |
2137 | * nexus has been reestablished, |
2138 | * | |
2139 | * Inputs : instance - this instance of the NCR5380. | |
2140 | * | |
2141 | * Locks: io_request_lock held by caller if IRQ driven | |
2142 | */ | |
2143 | ||
2144 | static void NCR5380_reselect(struct Scsi_Host *instance) { | |
1da177e4 LT |
2145 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) |
2146 | instance->hostdata; | |
2147 | unsigned char target_mask; | |
2148 | unsigned char lun, phase; | |
2149 | int len; | |
2150 | unsigned char msg[3]; | |
2151 | unsigned char *data; | |
710ddd0d | 2152 | struct scsi_cmnd *tmp = NULL, *prev; |
1da177e4 | 2153 | int abort = 0; |
1da177e4 LT |
2154 | |
2155 | /* | |
2156 | * Disable arbitration, etc. since the host adapter obviously | |
2157 | * lost, and tell an interrupted NCR5380_select() to restart. | |
2158 | */ | |
2159 | ||
2160 | NCR5380_write(MODE_REG, MR_BASE); | |
1da177e4 LT |
2161 | |
2162 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); | |
52a6a1cb | 2163 | dprintk(NDEBUG_SELECTION, "scsi%d : reselect\n", instance->host_no); |
1da177e4 LT |
2164 | |
2165 | /* | |
2166 | * At this point, we have detected that our SCSI ID is on the bus, | |
2167 | * SEL is true and BSY was false for at least one bus settle delay | |
2168 | * (400 ns). | |
2169 | * | |
2170 | * We must assert BSY ourselves, until the target drops the SEL | |
2171 | * signal. | |
2172 | */ | |
2173 | ||
2174 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); | |
2175 | ||
2176 | /* FIXME: timeout too long, must fail to workqueue */ | |
2177 | if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0) | |
2178 | abort = 1; | |
2179 | ||
2180 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2181 | ||
2182 | /* | |
2183 | * Wait for target to go into MSGIN. | |
2184 | * FIXME: timeout needed and fail to work queeu | |
2185 | */ | |
2186 | ||
1cc160e1 FT |
2187 | if (NCR5380_poll_politely(instance, |
2188 | STATUS_REG, SR_REQ, SR_REQ, 2 * HZ) < 0) | |
1da177e4 LT |
2189 | abort = 1; |
2190 | ||
2191 | len = 1; | |
2192 | data = msg; | |
2193 | phase = PHASE_MSGIN; | |
2194 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2195 | ||
2196 | if (!(msg[0] & 0x80)) { | |
2197 | printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no); | |
1abfd370 | 2198 | spi_print_msg(msg); |
1da177e4 LT |
2199 | abort = 1; |
2200 | } else { | |
2201 | /* Accept message by clearing ACK */ | |
2202 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2203 | lun = (msg[0] & 0x07); | |
2204 | ||
2205 | /* | |
2206 | * We need to add code for SCSI-II to track which devices have | |
2207 | * I_T_L_Q nexuses established, and which have simple I_T_L | |
2208 | * nexuses so we can chose to do additional data transfer. | |
2209 | */ | |
2210 | ||
2211 | /* | |
2212 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we | |
2213 | * just reestablished, and remove it from the disconnected queue. | |
2214 | */ | |
2215 | ||
2216 | ||
710ddd0d | 2217 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (struct scsi_cmnd *) tmp->host_scribble) |
9cb78c16 | 2218 | if ((target_mask == (1 << tmp->device->id)) && (lun == (u8)tmp->device->lun) |
1da177e4 LT |
2219 | ) { |
2220 | if (prev) { | |
2221 | REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); | |
2222 | prev->host_scribble = tmp->host_scribble; | |
2223 | } else { | |
2224 | REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble); | |
710ddd0d | 2225 | hostdata->disconnected_queue = (struct scsi_cmnd *) tmp->host_scribble; |
1da177e4 LT |
2226 | } |
2227 | tmp->host_scribble = NULL; | |
2228 | break; | |
2229 | } | |
2230 | if (!tmp) { | |
2231 | printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun); | |
2232 | /* | |
2233 | * Since we have an established nexus that we can't do anything with, | |
2234 | * we must abort it. | |
2235 | */ | |
2236 | abort = 1; | |
2237 | } | |
2238 | } | |
2239 | ||
2240 | if (abort) { | |
2241 | do_abort(instance); | |
2242 | } else { | |
2243 | hostdata->connected = tmp; | |
9cb78c16 | 2244 | 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 |
2245 | } |
2246 | } | |
2247 | ||
2248 | /* | |
2249 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) | |
2250 | * | |
2251 | * Purpose : called by interrupt handler when DMA finishes or a phase | |
2252 | * mismatch occurs (which would finish the DMA transfer). | |
2253 | * | |
2254 | * Inputs : instance - this instance of the NCR5380. | |
2255 | * | |
710ddd0d | 2256 | * Returns : pointer to the scsi_cmnd structure for which the I_T_L |
1da177e4 LT |
2257 | * nexus has been reestablished, on failure NULL is returned. |
2258 | */ | |
2259 | ||
2260 | #ifdef REAL_DMA | |
2261 | static void NCR5380_dma_complete(NCR5380_instance * instance) { | |
f8343685 | 2262 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
1da177e4 | 2263 | int transferred; |
1da177e4 LT |
2264 | |
2265 | /* | |
2266 | * XXX this might not be right. | |
2267 | * | |
2268 | * Wait for final byte to transfer, ie wait for ACK to go false. | |
2269 | * | |
2270 | * We should use the Last Byte Sent bit, unfortunately this is | |
2271 | * not available on the 5380/5381 (only the various CMOS chips) | |
2272 | * | |
2273 | * FIXME: timeout, and need to handle long timeout/irq case | |
2274 | */ | |
2275 | ||
2276 | NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ); | |
2277 | ||
1da177e4 LT |
2278 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2279 | ||
2280 | /* | |
2281 | * The only places we should see a phase mismatch and have to send | |
2282 | * data from the same set of pointers will be the data transfer | |
2283 | * phases. So, residual, requested length are only important here. | |
2284 | */ | |
2285 | ||
2286 | if (!(hostdata->connected->SCp.phase & SR_CD)) { | |
2287 | transferred = instance->dmalen - NCR5380_dma_residual(); | |
2288 | hostdata->connected->SCp.this_residual -= transferred; | |
2289 | hostdata->connected->SCp.ptr += transferred; | |
2290 | } | |
2291 | } | |
2292 | #endif /* def REAL_DMA */ | |
2293 | ||
2294 | /* | |
710ddd0d | 2295 | * Function : int NCR5380_abort (struct scsi_cmnd *cmd) |
1da177e4 LT |
2296 | * |
2297 | * Purpose : abort a command | |
2298 | * | |
710ddd0d | 2299 | * Inputs : cmd - the scsi_cmnd to abort, code - code to set the |
b6c92b7e | 2300 | * host byte of the result field to, if zero DID_ABORTED is |
1da177e4 LT |
2301 | * used. |
2302 | * | |
b6c92b7e | 2303 | * Returns : SUCCESS - success, FAILED on failure. |
1da177e4 | 2304 | * |
b6c92b7e HR |
2305 | * XXX - there is no way to abort the command that is currently |
2306 | * connected, you have to wait for it to complete. If this is | |
1da177e4 LT |
2307 | * a problem, we could implement longjmp() / setjmp(), setjmp() |
2308 | * called where the loop started in NCR5380_main(). | |
2309 | * | |
2310 | * Locks: host lock taken by caller | |
2311 | */ | |
2312 | ||
710ddd0d FT |
2313 | static int NCR5380_abort(struct scsi_cmnd *cmd) |
2314 | { | |
1da177e4 LT |
2315 | struct Scsi_Host *instance = cmd->device->host; |
2316 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; | |
710ddd0d | 2317 | struct scsi_cmnd *tmp, **prev; |
1fa6b5fb HR |
2318 | |
2319 | scmd_printk(KERN_WARNING, cmd, "aborting command\n"); | |
1da177e4 | 2320 | |
9dafbd93 | 2321 | spin_lock_irq(instance->host_lock); |
1da177e4 LT |
2322 | NCR5380_print_status(instance); |
2323 | ||
52a6a1cb FT |
2324 | dprintk(NDEBUG_ABORT, "scsi%d : abort called\n", instance->host_no); |
2325 | dprintk(NDEBUG_ABORT, " basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG)); | |
1da177e4 LT |
2326 | |
2327 | #if 0 | |
2328 | /* | |
2329 | * Case 1 : If the command is the currently executing command, | |
2330 | * we'll set the aborted flag and return control so that | |
2331 | * information transfer routine can exit cleanly. | |
2332 | */ | |
2333 | ||
2334 | if (hostdata->connected == cmd) { | |
52a6a1cb | 2335 | dprintk(NDEBUG_ABORT, "scsi%d : aborting connected command\n", instance->host_no); |
1da177e4 LT |
2336 | /* |
2337 | * We should perform BSY checking, and make sure we haven't slipped | |
2338 | * into BUS FREE. | |
2339 | */ | |
2340 | ||
2341 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); | |
2342 | /* | |
2343 | * Since we can't change phases until we've completed the current | |
2344 | * handshake, we have to source or sink a byte of data if the current | |
2345 | * phase is not MSGOUT. | |
2346 | */ | |
2347 | ||
2348 | /* | |
2349 | * Return control to the executing NCR drive so we can clear the | |
2350 | * aborted flag and get back into our main loop. | |
2351 | */ | |
2352 | ||
b6c92b7e | 2353 | return SUCCESS; |
1da177e4 LT |
2354 | } |
2355 | #endif | |
2356 | ||
2357 | /* | |
2358 | * Case 2 : If the command hasn't been issued yet, we simply remove it | |
2359 | * from the issue queue. | |
2360 | */ | |
2361 | ||
52a6a1cb | 2362 | dprintk(NDEBUG_ABORT, "scsi%d : abort going into loop.\n", instance->host_no); |
710ddd0d | 2363 | 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 |
2364 | if (cmd == tmp) { |
2365 | REMOVE(5, *prev, tmp, tmp->host_scribble); | |
710ddd0d | 2366 | (*prev) = (struct scsi_cmnd *) tmp->host_scribble; |
1da177e4 | 2367 | tmp->host_scribble = NULL; |
9dafbd93 | 2368 | spin_unlock_irq(instance->host_lock); |
1da177e4 | 2369 | tmp->result = DID_ABORT << 16; |
52a6a1cb | 2370 | dprintk(NDEBUG_ABORT, "scsi%d : abort removed command from issue queue.\n", instance->host_no); |
cce99c69 | 2371 | tmp->scsi_done(tmp); |
1da177e4 LT |
2372 | return SUCCESS; |
2373 | } | |
2374 | #if (NDEBUG & NDEBUG_ABORT) | |
2375 | /* KLL */ | |
2376 | else if (prev == tmp) | |
2377 | printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no); | |
2378 | #endif | |
2379 | ||
2380 | /* | |
2381 | * Case 3 : If any commands are connected, we're going to fail the abort | |
2382 | * and let the high level SCSI driver retry at a later time or | |
2383 | * issue a reset. | |
2384 | * | |
2385 | * Timeouts, and therefore aborted commands, will be highly unlikely | |
2386 | * and handling them cleanly in this situation would make the common | |
2387 | * case of noresets less efficient, and would pollute our code. So, | |
2388 | * we fail. | |
2389 | */ | |
2390 | ||
2391 | if (hostdata->connected) { | |
9dafbd93 | 2392 | spin_unlock_irq(instance->host_lock); |
52a6a1cb | 2393 | dprintk(NDEBUG_ABORT, "scsi%d : abort failed, command connected.\n", instance->host_no); |
1da177e4 LT |
2394 | return FAILED; |
2395 | } | |
2396 | /* | |
2397 | * Case 4: If the command is currently disconnected from the bus, and | |
2398 | * there are no connected commands, we reconnect the I_T_L or | |
2399 | * I_T_L_Q nexus associated with it, go into message out, and send | |
2400 | * an abort message. | |
2401 | * | |
2402 | * This case is especially ugly. In order to reestablish the nexus, we | |
2403 | * need to call NCR5380_select(). The easiest way to implement this | |
2404 | * function was to abort if the bus was busy, and let the interrupt | |
2405 | * handler triggered on the SEL for reselect take care of lost arbitrations | |
2406 | * where necessary, meaning interrupts need to be enabled. | |
2407 | * | |
2408 | * When interrupts are enabled, the queues may change - so we | |
2409 | * can't remove it from the disconnected queue before selecting it | |
2410 | * because that could cause a failure in hashing the nexus if that | |
2411 | * device reselected. | |
2412 | * | |
2413 | * Since the queues may change, we can't use the pointers from when we | |
2414 | * first locate it. | |
2415 | * | |
2416 | * So, we must first locate the command, and if NCR5380_select() | |
2417 | * succeeds, then issue the abort, relocate the command and remove | |
2418 | * it from the disconnected queue. | |
2419 | */ | |
2420 | ||
710ddd0d | 2421 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp; tmp = (struct scsi_cmnd *) tmp->host_scribble) |
1da177e4 | 2422 | if (cmd == tmp) { |
52a6a1cb | 2423 | dprintk(NDEBUG_ABORT, "scsi%d : aborting disconnected command.\n", instance->host_no); |
1da177e4 | 2424 | |
9dafbd93 FT |
2425 | if (NCR5380_select(instance, cmd)) { |
2426 | spin_unlock_irq(instance->host_lock); | |
1da177e4 | 2427 | return FAILED; |
9dafbd93 | 2428 | } |
52a6a1cb | 2429 | dprintk(NDEBUG_ABORT, "scsi%d : nexus reestablished.\n", instance->host_no); |
1da177e4 LT |
2430 | |
2431 | do_abort(instance); | |
2432 | ||
710ddd0d | 2433 | 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 |
2434 | if (cmd == tmp) { |
2435 | REMOVE(5, *prev, tmp, tmp->host_scribble); | |
710ddd0d | 2436 | *prev = (struct scsi_cmnd *) tmp->host_scribble; |
1da177e4 | 2437 | tmp->host_scribble = NULL; |
9dafbd93 | 2438 | spin_unlock_irq(instance->host_lock); |
1da177e4 | 2439 | tmp->result = DID_ABORT << 16; |
cce99c69 | 2440 | tmp->scsi_done(tmp); |
1da177e4 LT |
2441 | return SUCCESS; |
2442 | } | |
2443 | } | |
2444 | /* | |
2445 | * Case 5 : If we reached this point, the command was not found in any of | |
2446 | * the queues. | |
2447 | * | |
2448 | * We probably reached this point because of an unlikely race condition | |
2449 | * between the command completing successfully and the abortion code, | |
2450 | * so we won't panic, but we will notify the user in case something really | |
2451 | * broke. | |
2452 | */ | |
9dafbd93 | 2453 | spin_unlock_irq(instance->host_lock); |
1da177e4 LT |
2454 | printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n" |
2455 | " before abortion\n", instance->host_no); | |
2456 | return FAILED; | |
2457 | } | |
2458 | ||
2459 | ||
3be1b3ea FT |
2460 | /** |
2461 | * NCR5380_bus_reset - reset the SCSI bus | |
2462 | * @cmd: SCSI command undergoing EH | |
1da177e4 | 2463 | * |
3be1b3ea | 2464 | * Returns SUCCESS |
1da177e4 LT |
2465 | */ |
2466 | ||
710ddd0d | 2467 | static int NCR5380_bus_reset(struct scsi_cmnd *cmd) |
68b3aa7c JG |
2468 | { |
2469 | struct Scsi_Host *instance = cmd->device->host; | |
2470 | ||
3be1b3ea FT |
2471 | spin_lock_irq(instance->host_lock); |
2472 | ||
2473 | #if (NDEBUG & NDEBUG_ANY) | |
2474 | scmd_printk(KERN_INFO, cmd, "performing bus reset\n"); | |
68b3aa7c | 2475 | NCR5380_print_status(instance); |
3be1b3ea | 2476 | #endif |
68b3aa7c | 2477 | |
68b3aa7c | 2478 | do_reset(instance); |
3be1b3ea | 2479 | |
68b3aa7c | 2480 | spin_unlock_irq(instance->host_lock); |
1da177e4 | 2481 | |
1da177e4 LT |
2482 | return SUCCESS; |
2483 | } |