Commit | Line | Data |
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aff0cf9a | 1 | /* |
1da177e4 | 2 | * NCR 5380 generic driver routines. These should make it *trivial* |
594d4ba3 FT |
3 | * to implement 5380 SCSI drivers under Linux with a non-trantor |
4 | * architecture. | |
1da177e4 | 5 | * |
594d4ba3 | 6 | * Note that these routines also work with NR53c400 family chips. |
1da177e4 LT |
7 | * |
8 | * Copyright 1993, Drew Eckhardt | |
594d4ba3 FT |
9 | * Visionary Computing |
10 | * (Unix and Linux consulting and custom programming) | |
11 | * drew@colorado.edu | |
12 | * +1 (303) 666-5836 | |
1da177e4 | 13 | * |
aff0cf9a | 14 | * For more information, please consult |
1da177e4 LT |
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 | /* | |
c16df32e FT |
28 | * With contributions from Ray Van Tassle, Ingmar Baumgart, |
29 | * Ronald van Cuijlenborg, Alan Cox and others. | |
1da177e4 LT |
30 | */ |
31 | ||
32 | /* | |
aff0cf9a | 33 | * Further development / testing that should be done : |
1da177e4 | 34 | * 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete |
594d4ba3 FT |
35 | * code so that everything does the same thing that's done at the |
36 | * end of a pseudo-DMA read operation. | |
1da177e4 | 37 | * |
aff0cf9a | 38 | * 4. Test SCSI-II tagged queueing (I have no devices which support |
594d4ba3 | 39 | * tagged queueing) |
1da177e4 LT |
40 | */ |
41 | ||
1da177e4 LT |
42 | #ifdef BOARD_REQUIRES_NO_DELAY |
43 | #define io_recovery_delay(x) | |
44 | #else | |
45 | #define io_recovery_delay(x) udelay(x) | |
46 | #endif | |
47 | ||
48 | /* | |
49 | * Design | |
50 | * | |
aff0cf9a | 51 | * This is a generic 5380 driver. To use it on a different platform, |
1da177e4 | 52 | * one simply writes appropriate system specific macros (ie, data |
aff0cf9a | 53 | * transfer - some PC's will use the I/O bus, 68K's must use |
1da177e4 LT |
54 | * memory mapped) and drops this file in their 'C' wrapper. |
55 | * | |
aff0cf9a | 56 | * As far as command queueing, two queues are maintained for |
1da177e4 | 57 | * each 5380 in the system - commands that haven't been issued yet, |
aff0cf9a FT |
58 | * and commands that are currently executing. This means that an |
59 | * unlimited number of commands may be queued, letting | |
60 | * more commands propagate from the higher driver levels giving higher | |
61 | * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, | |
62 | * allowing multiple commands to propagate all the way to a SCSI-II device | |
1da177e4 LT |
63 | * while a command is already executing. |
64 | * | |
65 | * | |
aff0cf9a | 66 | * Issues specific to the NCR5380 : |
1da177e4 | 67 | * |
aff0cf9a FT |
68 | * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead |
69 | * piece of hardware that requires you to sit in a loop polling for | |
70 | * the REQ signal as long as you are connected. Some devices are | |
71 | * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect | |
686f3990 | 72 | * while doing long seek operations. [...] These |
1da177e4 LT |
73 | * broken devices are the exception rather than the rule and I'd rather |
74 | * spend my time optimizing for the normal case. | |
75 | * | |
76 | * Architecture : | |
77 | * | |
78 | * At the heart of the design is a coroutine, NCR5380_main, | |
79 | * which is started from a workqueue for each NCR5380 host in the | |
80 | * system. It attempts to establish I_T_L or I_T_L_Q nexuses by | |
81 | * removing the commands from the issue queue and calling | |
aff0cf9a | 82 | * NCR5380_select() if a nexus is not established. |
1da177e4 LT |
83 | * |
84 | * Once a nexus is established, the NCR5380_information_transfer() | |
85 | * phase goes through the various phases as instructed by the target. | |
86 | * if the target goes into MSG IN and sends a DISCONNECT message, | |
87 | * the command structure is placed into the per instance disconnected | |
aff0cf9a | 88 | * queue, and NCR5380_main tries to find more work. If the target is |
1da177e4 LT |
89 | * idle for too long, the system will try to sleep. |
90 | * | |
91 | * If a command has disconnected, eventually an interrupt will trigger, | |
92 | * calling NCR5380_intr() which will in turn call NCR5380_reselect | |
93 | * to reestablish a nexus. This will run main if necessary. | |
94 | * | |
aff0cf9a | 95 | * On command termination, the done function will be called as |
1da177e4 LT |
96 | * appropriate. |
97 | * | |
aff0cf9a | 98 | * SCSI pointers are maintained in the SCp field of SCSI command |
1da177e4 LT |
99 | * structures, being initialized after the command is connected |
100 | * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. | |
101 | * Note that in violation of the standard, an implicit SAVE POINTERS operation | |
102 | * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. | |
103 | */ | |
104 | ||
105 | /* | |
106 | * Using this file : | |
107 | * This file a skeleton Linux SCSI driver for the NCR 5380 series | |
aff0cf9a | 108 | * of chips. To use it, you write an architecture specific functions |
1da177e4 LT |
109 | * and macros and include this file in your driver. |
110 | * | |
aff0cf9a FT |
111 | * These macros control options : |
112 | * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be | |
594d4ba3 | 113 | * defined. |
aff0cf9a | 114 | * |
1da177e4 | 115 | * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically |
594d4ba3 | 116 | * for commands that return with a CHECK CONDITION status. |
1da177e4 LT |
117 | * |
118 | * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential | |
594d4ba3 | 119 | * transceivers. |
1da177e4 LT |
120 | * |
121 | * DONT_USE_INTR - if defined, never use interrupts, even if we probe or | |
594d4ba3 | 122 | * override-configure an IRQ. |
1da177e4 | 123 | * |
1da177e4 LT |
124 | * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases. |
125 | * | |
1da177e4 | 126 | * These macros MUST be defined : |
aff0cf9a | 127 | * |
1da177e4 LT |
128 | * NCR5380_read(register) - read from the specified register |
129 | * | |
aff0cf9a | 130 | * NCR5380_write(register, value) - write to the specific register |
1da177e4 | 131 | * |
aff0cf9a | 132 | * NCR5380_implementation_fields - additional fields needed for this |
594d4ba3 | 133 | * specific implementation of the NCR5380 |
1da177e4 LT |
134 | * |
135 | * Either real DMA *or* pseudo DMA may be implemented | |
aff0cf9a | 136 | * Note that the DMA setup functions should return the number of bytes |
594d4ba3 | 137 | * that they were able to program the controller for. |
1da177e4 | 138 | * |
1da177e4 LT |
139 | * NCR5380_dma_write_setup(instance, src, count) - initialize |
140 | * NCR5380_dma_read_setup(instance, dst, count) - initialize | |
141 | * NCR5380_dma_residual(instance); - residual count | |
142 | * | |
143 | * PSEUDO functions : | |
144 | * NCR5380_pwrite(instance, src, count) | |
145 | * NCR5380_pread(instance, dst, count); | |
146 | * | |
147 | * The generic driver is initialized by calling NCR5380_init(instance), | |
aff0cf9a | 148 | * after setting the appropriate host specific fields and ID. If the |
1da177e4 LT |
149 | * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, |
150 | * possible) function may be used. | |
151 | */ | |
152 | ||
54d8fe44 FT |
153 | static int do_abort(struct Scsi_Host *); |
154 | static void do_reset(struct Scsi_Host *); | |
1da177e4 | 155 | |
c16df32e | 156 | /** |
0d2cf867 | 157 | * initialize_SCp - init the scsi pointer field |
594d4ba3 | 158 | * @cmd: command block to set up |
1da177e4 | 159 | * |
594d4ba3 | 160 | * Set up the internal fields in the SCSI command. |
1da177e4 LT |
161 | */ |
162 | ||
710ddd0d | 163 | static inline void initialize_SCp(struct scsi_cmnd *cmd) |
1da177e4 | 164 | { |
aff0cf9a FT |
165 | /* |
166 | * Initialize the Scsi Pointer field so that all of the commands in the | |
1da177e4 LT |
167 | * various queues are valid. |
168 | */ | |
169 | ||
9e0fe44d BH |
170 | if (scsi_bufflen(cmd)) { |
171 | cmd->SCp.buffer = scsi_sglist(cmd); | |
172 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; | |
45711f1a | 173 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
1da177e4 LT |
174 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
175 | } else { | |
176 | cmd->SCp.buffer = NULL; | |
177 | cmd->SCp.buffers_residual = 0; | |
9e0fe44d BH |
178 | cmd->SCp.ptr = NULL; |
179 | cmd->SCp.this_residual = 0; | |
1da177e4 | 180 | } |
f27db8eb FT |
181 | |
182 | cmd->SCp.Status = 0; | |
183 | cmd->SCp.Message = 0; | |
1da177e4 LT |
184 | } |
185 | ||
186 | /** | |
b32ade12 | 187 | * NCR5380_poll_politely2 - wait for two chip register values |
2f854b82 | 188 | * @instance: controller to poll |
b32ade12 FT |
189 | * @reg1: 5380 register to poll |
190 | * @bit1: Bitmask to check | |
191 | * @val1: Expected value | |
192 | * @reg2: Second 5380 register to poll | |
193 | * @bit2: Second bitmask to check | |
194 | * @val2: Second expected value | |
2f854b82 FT |
195 | * @wait: Time-out in jiffies |
196 | * | |
197 | * Polls the chip in a reasonably efficient manner waiting for an | |
198 | * event to occur. After a short quick poll we begin to yield the CPU | |
199 | * (if possible). In irq contexts the time-out is arbitrarily limited. | |
200 | * Callers may hold locks as long as they are held in irq mode. | |
201 | * | |
b32ade12 | 202 | * Returns 0 if either or both event(s) occurred otherwise -ETIMEDOUT. |
1da177e4 | 203 | */ |
2f854b82 | 204 | |
b32ade12 FT |
205 | static int NCR5380_poll_politely2(struct Scsi_Host *instance, |
206 | int reg1, int bit1, int val1, | |
207 | int reg2, int bit2, int val2, int wait) | |
1da177e4 | 208 | { |
2f854b82 FT |
209 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
210 | unsigned long deadline = jiffies + wait; | |
211 | unsigned long n; | |
212 | ||
213 | /* Busy-wait for up to 10 ms */ | |
214 | n = min(10000U, jiffies_to_usecs(wait)); | |
215 | n *= hostdata->accesses_per_ms; | |
b32ade12 | 216 | n /= 2000; |
2f854b82 | 217 | do { |
b32ade12 FT |
218 | if ((NCR5380_read(reg1) & bit1) == val1) |
219 | return 0; | |
220 | if ((NCR5380_read(reg2) & bit2) == val2) | |
1da177e4 LT |
221 | return 0; |
222 | cpu_relax(); | |
2f854b82 FT |
223 | } while (n--); |
224 | ||
225 | if (irqs_disabled() || in_interrupt()) | |
226 | return -ETIMEDOUT; | |
227 | ||
228 | /* Repeatedly sleep for 1 ms until deadline */ | |
229 | while (time_is_after_jiffies(deadline)) { | |
230 | schedule_timeout_uninterruptible(1); | |
b32ade12 FT |
231 | if ((NCR5380_read(reg1) & bit1) == val1) |
232 | return 0; | |
233 | if ((NCR5380_read(reg2) & bit2) == val2) | |
1da177e4 | 234 | return 0; |
1da177e4 | 235 | } |
2f854b82 | 236 | |
1da177e4 LT |
237 | return -ETIMEDOUT; |
238 | } | |
239 | ||
b32ade12 FT |
240 | static inline int NCR5380_poll_politely(struct Scsi_Host *instance, |
241 | int reg, int bit, int val, int wait) | |
242 | { | |
243 | return NCR5380_poll_politely2(instance, reg, bit, val, | |
244 | reg, bit, val, wait); | |
245 | } | |
246 | ||
185a7a1c | 247 | #if NDEBUG |
1da177e4 LT |
248 | static struct { |
249 | unsigned char mask; | |
250 | const char *name; | |
aff0cf9a FT |
251 | } signals[] = { |
252 | {SR_DBP, "PARITY"}, | |
253 | {SR_RST, "RST"}, | |
254 | {SR_BSY, "BSY"}, | |
255 | {SR_REQ, "REQ"}, | |
256 | {SR_MSG, "MSG"}, | |
257 | {SR_CD, "CD"}, | |
258 | {SR_IO, "IO"}, | |
259 | {SR_SEL, "SEL"}, | |
1da177e4 | 260 | {0, NULL} |
aff0cf9a | 261 | }, |
1da177e4 | 262 | basrs[] = { |
aff0cf9a FT |
263 | {BASR_ATN, "ATN"}, |
264 | {BASR_ACK, "ACK"}, | |
1da177e4 | 265 | {0, NULL} |
aff0cf9a FT |
266 | }, |
267 | icrs[] = { | |
268 | {ICR_ASSERT_RST, "ASSERT RST"}, | |
269 | {ICR_ASSERT_ACK, "ASSERT ACK"}, | |
270 | {ICR_ASSERT_BSY, "ASSERT BSY"}, | |
271 | {ICR_ASSERT_SEL, "ASSERT SEL"}, | |
272 | {ICR_ASSERT_ATN, "ASSERT ATN"}, | |
273 | {ICR_ASSERT_DATA, "ASSERT DATA"}, | |
1da177e4 | 274 | {0, NULL} |
aff0cf9a FT |
275 | }, |
276 | mrs[] = { | |
277 | {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, | |
278 | {MR_TARGET, "MODE TARGET"}, | |
279 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, | |
280 | {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"}, | |
0d2cf867 | 281 | {MR_ENABLE_EOP_INTR, "MODE EOP INTR"}, |
aff0cf9a FT |
282 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, |
283 | {MR_DMA_MODE, "MODE DMA"}, | |
284 | {MR_ARBITRATE, "MODE ARBITRATION"}, | |
1da177e4 LT |
285 | {0, NULL} |
286 | }; | |
287 | ||
288 | /** | |
0d2cf867 FT |
289 | * NCR5380_print - print scsi bus signals |
290 | * @instance: adapter state to dump | |
1da177e4 | 291 | * |
594d4ba3 | 292 | * Print the SCSI bus signals for debugging purposes |
1da177e4 LT |
293 | */ |
294 | ||
295 | static void NCR5380_print(struct Scsi_Host *instance) | |
296 | { | |
1da177e4 | 297 | unsigned char status, data, basr, mr, icr, i; |
1da177e4 LT |
298 | |
299 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
300 | status = NCR5380_read(STATUS_REG); | |
301 | mr = NCR5380_read(MODE_REG); | |
302 | icr = NCR5380_read(INITIATOR_COMMAND_REG); | |
303 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
304 | ||
305 | printk("STATUS_REG: %02x ", status); | |
306 | for (i = 0; signals[i].mask; ++i) | |
307 | if (status & signals[i].mask) | |
308 | printk(",%s", signals[i].name); | |
309 | printk("\nBASR: %02x ", basr); | |
310 | for (i = 0; basrs[i].mask; ++i) | |
311 | if (basr & basrs[i].mask) | |
312 | printk(",%s", basrs[i].name); | |
313 | printk("\nICR: %02x ", icr); | |
314 | for (i = 0; icrs[i].mask; ++i) | |
315 | if (icr & icrs[i].mask) | |
316 | printk(",%s", icrs[i].name); | |
317 | printk("\nMODE: %02x ", mr); | |
318 | for (i = 0; mrs[i].mask; ++i) | |
319 | if (mr & mrs[i].mask) | |
320 | printk(",%s", mrs[i].name); | |
321 | printk("\n"); | |
322 | } | |
323 | ||
0d2cf867 FT |
324 | static struct { |
325 | unsigned char value; | |
326 | const char *name; | |
327 | } phases[] = { | |
328 | {PHASE_DATAOUT, "DATAOUT"}, | |
329 | {PHASE_DATAIN, "DATAIN"}, | |
330 | {PHASE_CMDOUT, "CMDOUT"}, | |
331 | {PHASE_STATIN, "STATIN"}, | |
332 | {PHASE_MSGOUT, "MSGOUT"}, | |
333 | {PHASE_MSGIN, "MSGIN"}, | |
334 | {PHASE_UNKNOWN, "UNKNOWN"} | |
335 | }; | |
1da177e4 | 336 | |
c16df32e | 337 | /** |
0d2cf867 | 338 | * NCR5380_print_phase - show SCSI phase |
594d4ba3 | 339 | * @instance: adapter to dump |
1da177e4 | 340 | * |
594d4ba3 | 341 | * Print the current SCSI phase for debugging purposes |
1da177e4 LT |
342 | */ |
343 | ||
344 | static void NCR5380_print_phase(struct Scsi_Host *instance) | |
345 | { | |
1da177e4 LT |
346 | unsigned char status; |
347 | int i; | |
1da177e4 LT |
348 | |
349 | status = NCR5380_read(STATUS_REG); | |
350 | if (!(status & SR_REQ)) | |
6a6ff4ac | 351 | shost_printk(KERN_DEBUG, instance, "REQ not asserted, phase unknown.\n"); |
1da177e4 | 352 | else { |
0d2cf867 FT |
353 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && |
354 | (phases[i].value != (status & PHASE_MASK)); ++i) | |
355 | ; | |
6a6ff4ac | 356 | shost_printk(KERN_DEBUG, instance, "phase %s\n", phases[i].name); |
1da177e4 LT |
357 | } |
358 | } | |
359 | #endif | |
360 | ||
1da177e4 | 361 | |
d5f7e65d | 362 | static int probe_irq __initdata; |
1da177e4 LT |
363 | |
364 | /** | |
594d4ba3 FT |
365 | * probe_intr - helper for IRQ autoprobe |
366 | * @irq: interrupt number | |
367 | * @dev_id: unused | |
368 | * @regs: unused | |
1da177e4 | 369 | * |
594d4ba3 FT |
370 | * Set a flag to indicate the IRQ in question was received. This is |
371 | * used by the IRQ probe code. | |
1da177e4 | 372 | */ |
aff0cf9a | 373 | |
7d12e780 | 374 | static irqreturn_t __init probe_intr(int irq, void *dev_id) |
1da177e4 LT |
375 | { |
376 | probe_irq = irq; | |
377 | return IRQ_HANDLED; | |
378 | } | |
379 | ||
380 | /** | |
594d4ba3 FT |
381 | * NCR5380_probe_irq - find the IRQ of an NCR5380 |
382 | * @instance: NCR5380 controller | |
383 | * @possible: bitmask of ISA IRQ lines | |
1da177e4 | 384 | * |
594d4ba3 FT |
385 | * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ |
386 | * and then looking to see what interrupt actually turned up. | |
1da177e4 LT |
387 | */ |
388 | ||
702809ce AM |
389 | static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance, |
390 | int possible) | |
1da177e4 | 391 | { |
e8a60144 | 392 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
1da177e4 LT |
393 | unsigned long timeout; |
394 | int trying_irqs, i, mask; | |
1da177e4 | 395 | |
22f5f10d | 396 | for (trying_irqs = 0, i = 1, mask = 2; i < 16; ++i, mask <<= 1) |
4909cc2b | 397 | if ((mask & possible) && (request_irq(i, &probe_intr, 0, "NCR-probe", NULL) == 0)) |
1da177e4 LT |
398 | trying_irqs |= mask; |
399 | ||
4e5a800c | 400 | timeout = jiffies + msecs_to_jiffies(250); |
22f5f10d | 401 | probe_irq = NO_IRQ; |
1da177e4 LT |
402 | |
403 | /* | |
404 | * A interrupt is triggered whenever BSY = false, SEL = true | |
aff0cf9a | 405 | * and a bit set in the SELECT_ENABLE_REG is asserted on the |
1da177e4 LT |
406 | * SCSI bus. |
407 | * | |
408 | * Note that the bus is only driven when the phase control signals | |
409 | * (I/O, C/D, and MSG) match those in the TCR, so we must reset that | |
410 | * to zero. | |
411 | */ | |
412 | ||
413 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
414 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
415 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); | |
416 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL); | |
417 | ||
22f5f10d | 418 | while (probe_irq == NO_IRQ && time_before(jiffies, timeout)) |
a9a3047d | 419 | schedule_timeout_uninterruptible(1); |
aff0cf9a | 420 | |
1da177e4 LT |
421 | NCR5380_write(SELECT_ENABLE_REG, 0); |
422 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
423 | ||
22f5f10d | 424 | for (i = 1, mask = 2; i < 16; ++i, mask <<= 1) |
1da177e4 LT |
425 | if (trying_irqs & mask) |
426 | free_irq(i, NULL); | |
427 | ||
428 | return probe_irq; | |
429 | } | |
430 | ||
431 | /** | |
594d4ba3 FT |
432 | * NCR58380_info - report driver and host information |
433 | * @instance: relevant scsi host instance | |
1da177e4 | 434 | * |
594d4ba3 | 435 | * For use as the host template info() handler. |
1da177e4 LT |
436 | */ |
437 | ||
8c32513b | 438 | static const char *NCR5380_info(struct Scsi_Host *instance) |
1da177e4 | 439 | { |
8c32513b FT |
440 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
441 | ||
442 | return hostdata->info; | |
443 | } | |
444 | ||
445 | static void prepare_info(struct Scsi_Host *instance) | |
446 | { | |
447 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
448 | ||
449 | snprintf(hostdata->info, sizeof(hostdata->info), | |
450 | "%s, io_port 0x%lx, n_io_port %d, " | |
451 | "base 0x%lx, irq %d, " | |
452 | "can_queue %d, cmd_per_lun %d, " | |
453 | "sg_tablesize %d, this_id %d, " | |
be3f4121 | 454 | "flags { %s%s%s}, " |
8c32513b FT |
455 | "options { %s} ", |
456 | instance->hostt->name, instance->io_port, instance->n_io_port, | |
457 | instance->base, instance->irq, | |
458 | instance->can_queue, instance->cmd_per_lun, | |
459 | instance->sg_tablesize, instance->this_id, | |
55181be8 | 460 | hostdata->flags & FLAG_NO_DMA_FIXUP ? "NO_DMA_FIXUP " : "", |
8c32513b | 461 | hostdata->flags & FLAG_NO_PSEUDO_DMA ? "NO_PSEUDO_DMA " : "", |
9c3f0e2b | 462 | hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "", |
1da177e4 | 463 | #ifdef AUTOPROBE_IRQ |
8c32513b | 464 | "AUTOPROBE_IRQ " |
1da177e4 | 465 | #endif |
1da177e4 | 466 | #ifdef DIFFERENTIAL |
8c32513b | 467 | "DIFFERENTIAL " |
1da177e4 | 468 | #endif |
1da177e4 | 469 | #ifdef PARITY |
8c32513b | 470 | "PARITY " |
1da177e4 LT |
471 | #endif |
472 | #ifdef PSEUDO_DMA | |
8c32513b | 473 | "PSEUDO_DMA " |
8c32513b FT |
474 | #endif |
475 | ""); | |
1da177e4 LT |
476 | } |
477 | ||
a9c2dc43 | 478 | #ifdef PSEUDO_DMA |
dd7ab71b AV |
479 | static int __maybe_unused NCR5380_write_info(struct Scsi_Host *instance, |
480 | char *buffer, int length) | |
481 | { | |
a9c2dc43 FT |
482 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
483 | ||
484 | hostdata->spin_max_r = 0; | |
485 | hostdata->spin_max_w = 0; | |
486 | return 0; | |
dd7ab71b | 487 | } |
1da177e4 | 488 | |
dd7ab71b | 489 | static int __maybe_unused NCR5380_show_info(struct seq_file *m, |
0d2cf867 | 490 | struct Scsi_Host *instance) |
1da177e4 | 491 | { |
e8a60144 | 492 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
1da177e4 | 493 | |
0c3de38f | 494 | seq_printf(m, "Highwater I/O busy spin counts: write %d, read %d\n", |
a9c2dc43 | 495 | hostdata->spin_max_w, hostdata->spin_max_r); |
dd7ab71b | 496 | return 0; |
1da177e4 | 497 | } |
e5c3fddf | 498 | #endif |
1da177e4 LT |
499 | |
500 | /** | |
0d2cf867 | 501 | * NCR5380_init - initialise an NCR5380 |
594d4ba3 FT |
502 | * @instance: adapter to configure |
503 | * @flags: control flags | |
1da177e4 | 504 | * |
594d4ba3 FT |
505 | * Initializes *instance and corresponding 5380 chip, |
506 | * with flags OR'd into the initial flags value. | |
1da177e4 | 507 | * |
594d4ba3 | 508 | * Notes : I assume that the host, hostno, and id bits have been |
0d2cf867 | 509 | * set correctly. I don't care about the irq and other fields. |
1da177e4 | 510 | * |
594d4ba3 | 511 | * Returns 0 for success |
1da177e4 LT |
512 | */ |
513 | ||
6f039790 | 514 | static int NCR5380_init(struct Scsi_Host *instance, int flags) |
1da177e4 | 515 | { |
e8a60144 | 516 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
b6488f97 | 517 | int i; |
2f854b82 | 518 | unsigned long deadline; |
1da177e4 | 519 | |
0d2cf867 | 520 | hostdata->host = instance; |
1da177e4 | 521 | hostdata->id_mask = 1 << instance->this_id; |
0d2cf867 | 522 | hostdata->id_higher_mask = 0; |
1da177e4 LT |
523 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) |
524 | if (i > hostdata->id_mask) | |
525 | hostdata->id_higher_mask |= i; | |
526 | for (i = 0; i < 8; ++i) | |
527 | hostdata->busy[i] = 0; | |
e4dec680 FT |
528 | hostdata->dma_len = 0; |
529 | ||
11d2f63b | 530 | spin_lock_init(&hostdata->lock); |
1da177e4 | 531 | hostdata->connected = NULL; |
f27db8eb FT |
532 | hostdata->sensing = NULL; |
533 | INIT_LIST_HEAD(&hostdata->autosense); | |
32b26a10 FT |
534 | INIT_LIST_HEAD(&hostdata->unissued); |
535 | INIT_LIST_HEAD(&hostdata->disconnected); | |
536 | ||
55181be8 | 537 | hostdata->flags = flags; |
aff0cf9a | 538 | |
8d8601a7 | 539 | INIT_WORK(&hostdata->main_task, NCR5380_main); |
0ad0eff9 FT |
540 | hostdata->work_q = alloc_workqueue("ncr5380_%d", |
541 | WQ_UNBOUND | WQ_MEM_RECLAIM, | |
542 | 1, instance->host_no); | |
543 | if (!hostdata->work_q) | |
544 | return -ENOMEM; | |
545 | ||
8c32513b FT |
546 | prepare_info(instance); |
547 | ||
1da177e4 LT |
548 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
549 | NCR5380_write(MODE_REG, MR_BASE); | |
550 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
551 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
2f854b82 FT |
552 | |
553 | /* Calibrate register polling loop */ | |
554 | i = 0; | |
555 | deadline = jiffies + 1; | |
556 | do { | |
557 | cpu_relax(); | |
558 | } while (time_is_after_jiffies(deadline)); | |
559 | deadline += msecs_to_jiffies(256); | |
560 | do { | |
561 | NCR5380_read(STATUS_REG); | |
562 | ++i; | |
563 | cpu_relax(); | |
564 | } while (time_is_after_jiffies(deadline)); | |
565 | hostdata->accesses_per_ms = i / 256; | |
566 | ||
b6488f97 FT |
567 | return 0; |
568 | } | |
1da177e4 | 569 | |
b6488f97 FT |
570 | /** |
571 | * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems. | |
572 | * @instance: adapter to check | |
573 | * | |
574 | * If the system crashed, it may have crashed with a connected target and | |
575 | * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the | |
576 | * currently established nexus, which we know nothing about. Failing that | |
577 | * do a bus reset. | |
578 | * | |
579 | * Note that a bus reset will cause the chip to assert IRQ. | |
580 | * | |
581 | * Returns 0 if successful, otherwise -ENXIO. | |
582 | */ | |
583 | ||
584 | static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance) | |
585 | { | |
9c3f0e2b | 586 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
b6488f97 | 587 | int pass; |
1da177e4 LT |
588 | |
589 | for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { | |
590 | switch (pass) { | |
591 | case 1: | |
592 | case 3: | |
593 | case 5: | |
636b1ec8 FT |
594 | shost_printk(KERN_ERR, instance, "SCSI bus busy, waiting up to five seconds\n"); |
595 | NCR5380_poll_politely(instance, | |
596 | STATUS_REG, SR_BSY, 0, 5 * HZ); | |
1da177e4 LT |
597 | break; |
598 | case 2: | |
636b1ec8 | 599 | shost_printk(KERN_ERR, instance, "bus busy, attempting abort\n"); |
1da177e4 LT |
600 | do_abort(instance); |
601 | break; | |
602 | case 4: | |
636b1ec8 | 603 | shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n"); |
1da177e4 | 604 | do_reset(instance); |
9c3f0e2b FT |
605 | /* Wait after a reset; the SCSI standard calls for |
606 | * 250ms, we wait 500ms to be on the safe side. | |
607 | * But some Toshiba CD-ROMs need ten times that. | |
608 | */ | |
609 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) | |
610 | msleep(2500); | |
611 | else | |
612 | msleep(500); | |
1da177e4 LT |
613 | break; |
614 | case 6: | |
636b1ec8 | 615 | shost_printk(KERN_ERR, instance, "bus locked solid\n"); |
1da177e4 LT |
616 | return -ENXIO; |
617 | } | |
618 | } | |
619 | return 0; | |
620 | } | |
621 | ||
622 | /** | |
0d2cf867 | 623 | * NCR5380_exit - remove an NCR5380 |
594d4ba3 | 624 | * @instance: adapter to remove |
0d2cf867 FT |
625 | * |
626 | * Assumes that no more work can be queued (e.g. by NCR5380_intr). | |
1da177e4 LT |
627 | */ |
628 | ||
a43cf0f3 | 629 | static void NCR5380_exit(struct Scsi_Host *instance) |
1da177e4 | 630 | { |
e8a60144 | 631 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
1da177e4 | 632 | |
8d8601a7 | 633 | cancel_work_sync(&hostdata->main_task); |
0ad0eff9 | 634 | destroy_workqueue(hostdata->work_q); |
1da177e4 LT |
635 | } |
636 | ||
677e0194 FT |
637 | /** |
638 | * complete_cmd - finish processing a command and return it to the SCSI ML | |
639 | * @instance: the host instance | |
640 | * @cmd: command to complete | |
641 | */ | |
642 | ||
643 | static void complete_cmd(struct Scsi_Host *instance, | |
644 | struct scsi_cmnd *cmd) | |
645 | { | |
646 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
647 | ||
648 | dsprintk(NDEBUG_QUEUES, instance, "complete_cmd: cmd %p\n", cmd); | |
649 | ||
f27db8eb FT |
650 | if (hostdata->sensing == cmd) { |
651 | /* Autosense processing ends here */ | |
652 | if ((cmd->result & 0xff) != SAM_STAT_GOOD) { | |
653 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
654 | set_host_byte(cmd, DID_ERROR); | |
655 | } else | |
656 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
657 | hostdata->sensing = NULL; | |
658 | } | |
659 | ||
677e0194 FT |
660 | hostdata->busy[scmd_id(cmd)] &= ~(1 << cmd->device->lun); |
661 | ||
662 | cmd->scsi_done(cmd); | |
663 | } | |
664 | ||
1da177e4 | 665 | /** |
1bb40589 FT |
666 | * NCR5380_queue_command - queue a command |
667 | * @instance: the relevant SCSI adapter | |
668 | * @cmd: SCSI command | |
1da177e4 | 669 | * |
1bb40589 FT |
670 | * cmd is added to the per-instance issue queue, with minor |
671 | * twiddling done to the host specific fields of cmd. If the | |
672 | * main coroutine is not running, it is restarted. | |
1da177e4 LT |
673 | */ |
674 | ||
1bb40589 FT |
675 | static int NCR5380_queue_command(struct Scsi_Host *instance, |
676 | struct scsi_cmnd *cmd) | |
1da177e4 | 677 | { |
1bb40589 | 678 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
32b26a10 | 679 | struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); |
1bb40589 | 680 | unsigned long flags; |
1da177e4 LT |
681 | |
682 | #if (NDEBUG & NDEBUG_NO_WRITE) | |
683 | switch (cmd->cmnd[0]) { | |
684 | case WRITE_6: | |
685 | case WRITE_10: | |
dbb6b350 | 686 | shost_printk(KERN_DEBUG, instance, "WRITE attempted with NDEBUG_NO_WRITE set\n"); |
1da177e4 | 687 | cmd->result = (DID_ERROR << 16); |
1bb40589 | 688 | cmd->scsi_done(cmd); |
1da177e4 LT |
689 | return 0; |
690 | } | |
0d2cf867 | 691 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ |
1da177e4 | 692 | |
1da177e4 LT |
693 | cmd->result = 0; |
694 | ||
11d2f63b | 695 | spin_lock_irqsave(&hostdata->lock, flags); |
1bb40589 | 696 | |
aff0cf9a FT |
697 | /* |
698 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
1da177e4 | 699 | * commands are added to the head of the queue since any command will |
aff0cf9a | 700 | * clear the contingent allegiance condition that exists and the |
1da177e4 LT |
701 | * sense data is only guaranteed to be valid while the condition exists. |
702 | */ | |
703 | ||
32b26a10 FT |
704 | if (cmd->cmnd[0] == REQUEST_SENSE) |
705 | list_add(&ncmd->list, &hostdata->unissued); | |
706 | else | |
707 | list_add_tail(&ncmd->list, &hostdata->unissued); | |
708 | ||
11d2f63b | 709 | spin_unlock_irqrestore(&hostdata->lock, flags); |
1bb40589 | 710 | |
dbb6b350 FT |
711 | dsprintk(NDEBUG_QUEUES, instance, "command %p added to %s of queue\n", |
712 | cmd, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); | |
1da177e4 | 713 | |
1da177e4 | 714 | /* Kick off command processing */ |
8d8601a7 | 715 | queue_work(hostdata->work_q, &hostdata->main_task); |
1da177e4 LT |
716 | return 0; |
717 | } | |
718 | ||
f27db8eb FT |
719 | /** |
720 | * dequeue_next_cmd - dequeue a command for processing | |
721 | * @instance: the scsi host instance | |
722 | * | |
723 | * Priority is given to commands on the autosense queue. These commands | |
724 | * need autosense because of a CHECK CONDITION result. | |
725 | * | |
726 | * Returns a command pointer if a command is found for a target that is | |
727 | * not already busy. Otherwise returns NULL. | |
728 | */ | |
729 | ||
730 | static struct scsi_cmnd *dequeue_next_cmd(struct Scsi_Host *instance) | |
731 | { | |
732 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
733 | struct NCR5380_cmd *ncmd; | |
734 | struct scsi_cmnd *cmd; | |
735 | ||
8d5dbec3 | 736 | if (hostdata->sensing || list_empty(&hostdata->autosense)) { |
f27db8eb FT |
737 | list_for_each_entry(ncmd, &hostdata->unissued, list) { |
738 | cmd = NCR5380_to_scmd(ncmd); | |
739 | dsprintk(NDEBUG_QUEUES, instance, "dequeue: cmd=%p target=%d busy=0x%02x lun=%llu\n", | |
740 | cmd, scmd_id(cmd), hostdata->busy[scmd_id(cmd)], cmd->device->lun); | |
741 | ||
742 | if (!(hostdata->busy[scmd_id(cmd)] & (1 << cmd->device->lun))) { | |
743 | list_del(&ncmd->list); | |
744 | dsprintk(NDEBUG_QUEUES, instance, | |
745 | "dequeue: removed %p from issue queue\n", cmd); | |
746 | return cmd; | |
747 | } | |
748 | } | |
749 | } else { | |
750 | /* Autosense processing begins here */ | |
751 | ncmd = list_first_entry(&hostdata->autosense, | |
752 | struct NCR5380_cmd, list); | |
753 | list_del(&ncmd->list); | |
754 | cmd = NCR5380_to_scmd(ncmd); | |
755 | dsprintk(NDEBUG_QUEUES, instance, | |
756 | "dequeue: removed %p from autosense queue\n", cmd); | |
757 | scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); | |
758 | hostdata->sensing = cmd; | |
759 | return cmd; | |
760 | } | |
761 | return NULL; | |
762 | } | |
763 | ||
764 | static void requeue_cmd(struct Scsi_Host *instance, struct scsi_cmnd *cmd) | |
765 | { | |
766 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
767 | struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); | |
768 | ||
8d5dbec3 | 769 | if (hostdata->sensing == cmd) { |
f27db8eb FT |
770 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); |
771 | list_add(&ncmd->list, &hostdata->autosense); | |
772 | hostdata->sensing = NULL; | |
773 | } else | |
774 | list_add(&ncmd->list, &hostdata->unissued); | |
775 | } | |
776 | ||
1da177e4 | 777 | /** |
0d2cf867 | 778 | * NCR5380_main - NCR state machines |
1da177e4 | 779 | * |
594d4ba3 FT |
780 | * NCR5380_main is a coroutine that runs as long as more work can |
781 | * be done on the NCR5380 host adapters in a system. Both | |
782 | * NCR5380_queue_command() and NCR5380_intr() will try to start it | |
783 | * in case it is not running. | |
1da177e4 LT |
784 | */ |
785 | ||
c4028958 | 786 | static void NCR5380_main(struct work_struct *work) |
1da177e4 | 787 | { |
c4028958 | 788 | struct NCR5380_hostdata *hostdata = |
8d8601a7 | 789 | container_of(work, struct NCR5380_hostdata, main_task); |
1da177e4 | 790 | struct Scsi_Host *instance = hostdata->host; |
1da177e4 | 791 | int done; |
aff0cf9a | 792 | |
1da177e4 | 793 | do { |
1da177e4 | 794 | done = 1; |
11d2f63b | 795 | |
0a4e3612 | 796 | spin_lock_irq(&hostdata->lock); |
ccf6efd7 FT |
797 | while (!hostdata->connected && !hostdata->selecting) { |
798 | struct scsi_cmnd *cmd = dequeue_next_cmd(instance); | |
799 | ||
800 | if (!cmd) | |
801 | break; | |
1da177e4 | 802 | |
f27db8eb | 803 | dsprintk(NDEBUG_MAIN, instance, "main: dequeued %p\n", cmd); |
76f13b93 | 804 | |
f27db8eb FT |
805 | /* |
806 | * Attempt to establish an I_T_L nexus here. | |
807 | * On success, instance->hostdata->connected is set. | |
808 | * On failure, we must add the command back to the | |
809 | * issue queue so we can keep trying. | |
810 | */ | |
811 | /* | |
812 | * REQUEST SENSE commands are issued without tagged | |
813 | * queueing, even on SCSI-II devices because the | |
814 | * contingent allegiance condition exists for the | |
815 | * entire unit. | |
816 | */ | |
11d2f63b | 817 | |
ccf6efd7 | 818 | if (!NCR5380_select(instance, cmd)) { |
707d62b3 | 819 | dsprintk(NDEBUG_MAIN, instance, "main: select complete\n"); |
f27db8eb FT |
820 | } else { |
821 | dsprintk(NDEBUG_MAIN | NDEBUG_QUEUES, instance, | |
822 | "main: select failed, returning %p to queue\n", cmd); | |
823 | requeue_cmd(instance, cmd); | |
824 | } | |
825 | } | |
e4dec680 | 826 | if (hostdata->connected && !hostdata->dma_len) { |
b746545f | 827 | dsprintk(NDEBUG_MAIN, instance, "main: performing information transfer\n"); |
1da177e4 | 828 | NCR5380_information_transfer(instance); |
1da177e4 | 829 | done = 0; |
1d3db59d | 830 | } |
0a4e3612 FT |
831 | spin_unlock_irq(&hostdata->lock); |
832 | if (!done) | |
833 | cond_resched(); | |
1da177e4 | 834 | } while (!done); |
1da177e4 LT |
835 | } |
836 | ||
837 | #ifndef DONT_USE_INTR | |
838 | ||
839 | /** | |
cd400825 FT |
840 | * NCR5380_intr - generic NCR5380 irq handler |
841 | * @irq: interrupt number | |
842 | * @dev_id: device info | |
843 | * | |
844 | * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses | |
845 | * from the disconnected queue, and restarting NCR5380_main() | |
846 | * as required. | |
847 | * | |
848 | * The chip can assert IRQ in any of six different conditions. The IRQ flag | |
849 | * is then cleared by reading the Reset Parity/Interrupt Register (RPIR). | |
850 | * Three of these six conditions are latched in the Bus and Status Register: | |
851 | * - End of DMA (cleared by ending DMA Mode) | |
852 | * - Parity error (cleared by reading RPIR) | |
853 | * - Loss of BSY (cleared by reading RPIR) | |
854 | * Two conditions have flag bits that are not latched: | |
855 | * - Bus phase mismatch (non-maskable in DMA Mode, cleared by ending DMA Mode) | |
856 | * - Bus reset (non-maskable) | |
857 | * The remaining condition has no flag bit at all: | |
858 | * - Selection/reselection | |
859 | * | |
860 | * Hence, establishing the cause(s) of any interrupt is partly guesswork. | |
861 | * In "The DP8490 and DP5380 Comparison Guide", National Semiconductor | |
862 | * claimed that "the design of the [DP8490] interrupt logic ensures | |
863 | * interrupts will not be lost (they can be on the DP5380)." | |
864 | * The L5380/53C80 datasheet from LOGIC Devices has more details. | |
865 | * | |
866 | * Checking for bus reset by reading RST is futile because of interrupt | |
867 | * latency, but a bus reset will reset chip logic. Checking for parity error | |
868 | * is unnecessary because that interrupt is never enabled. A Loss of BSY | |
869 | * condition will clear DMA Mode. We can tell when this occurs because the | |
870 | * the Busy Monitor interrupt is enabled together with DMA Mode. | |
1da177e4 LT |
871 | */ |
872 | ||
cd400825 | 873 | static irqreturn_t NCR5380_intr(int irq, void *dev_id) |
1da177e4 | 874 | { |
baa9aac6 | 875 | struct Scsi_Host *instance = dev_id; |
cd400825 FT |
876 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
877 | int handled = 0; | |
1da177e4 LT |
878 | unsigned char basr; |
879 | unsigned long flags; | |
880 | ||
11d2f63b | 881 | spin_lock_irqsave(&hostdata->lock, flags); |
cd400825 FT |
882 | |
883 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
884 | if (basr & BASR_IRQ) { | |
885 | unsigned char mr = NCR5380_read(MODE_REG); | |
886 | unsigned char sr = NCR5380_read(STATUS_REG); | |
887 | ||
b746545f FT |
888 | dsprintk(NDEBUG_INTR, instance, "IRQ %d, BASR 0x%02x, SR 0x%02x, MR 0x%02x\n", |
889 | irq, basr, sr, mr); | |
1da177e4 | 890 | |
cd400825 FT |
891 | if ((NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_mask) && |
892 | (sr & (SR_SEL | SR_IO | SR_BSY | SR_RST)) == (SR_SEL | SR_IO)) { | |
893 | /* Probably reselected */ | |
894 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
895 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
896 | ||
b746545f | 897 | dsprintk(NDEBUG_INTR, instance, "interrupt with SEL and IO\n"); |
cd400825 FT |
898 | |
899 | if (!hostdata->connected) { | |
900 | NCR5380_reselect(instance); | |
901 | queue_work(hostdata->work_q, &hostdata->main_task); | |
1da177e4 | 902 | } |
cd400825 FT |
903 | if (!hostdata->connected) |
904 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
905 | } else { | |
906 | /* Probably Bus Reset */ | |
907 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
908 | ||
b746545f | 909 | dsprintk(NDEBUG_INTR, instance, "unknown interrupt\n"); |
cd400825 FT |
910 | } |
911 | handled = 1; | |
912 | } else { | |
913 | shost_printk(KERN_NOTICE, instance, "interrupt without IRQ bit\n"); | |
914 | } | |
915 | ||
11d2f63b | 916 | spin_unlock_irqrestore(&hostdata->lock, flags); |
cd400825 FT |
917 | |
918 | return IRQ_RETVAL(handled); | |
1da177e4 LT |
919 | } |
920 | ||
aff0cf9a | 921 | #endif |
1da177e4 | 922 | |
aff0cf9a | 923 | /* |
710ddd0d | 924 | * Function : int NCR5380_select(struct Scsi_Host *instance, |
594d4ba3 | 925 | * struct scsi_cmnd *cmd) |
1da177e4 LT |
926 | * |
927 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, | |
594d4ba3 FT |
928 | * including ARBITRATION, SELECTION, and initial message out for |
929 | * IDENTIFY and queue messages. | |
1da177e4 | 930 | * |
aff0cf9a | 931 | * Inputs : instance - instantiation of the 5380 driver on which this |
594d4ba3 | 932 | * target lives, cmd - SCSI command to execute. |
aff0cf9a | 933 | * |
707d62b3 FT |
934 | * Returns cmd if selection failed but should be retried, |
935 | * NULL if selection failed and should not be retried, or | |
936 | * NULL if selection succeeded (hostdata->connected == cmd). | |
1da177e4 | 937 | * |
aff0cf9a | 938 | * Side effects : |
594d4ba3 FT |
939 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit |
940 | * with registers as they should have been on entry - ie | |
941 | * SELECT_ENABLE will be set appropriately, the NCR5380 | |
942 | * will cease to drive any SCSI bus signals. | |
1da177e4 | 943 | * |
594d4ba3 FT |
944 | * If successful : I_T_L or I_T_L_Q nexus will be established, |
945 | * instance->connected will be set to cmd. | |
946 | * SELECT interrupt will be disabled. | |
1da177e4 | 947 | * |
594d4ba3 FT |
948 | * If failed (no target) : cmd->scsi_done() will be called, and the |
949 | * cmd->result host byte set to DID_BAD_TARGET. | |
1da177e4 | 950 | */ |
aff0cf9a | 951 | |
707d62b3 FT |
952 | static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance, |
953 | struct scsi_cmnd *cmd) | |
1da177e4 | 954 | { |
e8a60144 | 955 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
1da177e4 LT |
956 | unsigned char tmp[3], phase; |
957 | unsigned char *data; | |
958 | int len; | |
1da177e4 | 959 | int err; |
1da177e4 | 960 | |
1da177e4 | 961 | NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
b746545f FT |
962 | dsprintk(NDEBUG_ARBITRATION, instance, "starting arbitration, id = %d\n", |
963 | instance->this_id); | |
1da177e4 | 964 | |
707d62b3 FT |
965 | /* |
966 | * Arbitration and selection phases are slow and involve dropping the | |
967 | * lock, so we have to watch out for EH. An exception handler may | |
968 | * change 'selecting' to NULL. This function will then return NULL | |
969 | * so that the caller will forget about 'cmd'. (During information | |
970 | * transfer phases, EH may change 'connected' to NULL.) | |
971 | */ | |
972 | hostdata->selecting = cmd; | |
973 | ||
aff0cf9a FT |
974 | /* |
975 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the | |
1da177e4 LT |
976 | * data bus during SELECTION. |
977 | */ | |
978 | ||
979 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
980 | ||
aff0cf9a | 981 | /* |
1da177e4 LT |
982 | * Start arbitration. |
983 | */ | |
984 | ||
985 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); | |
986 | NCR5380_write(MODE_REG, MR_ARBITRATE); | |
987 | ||
55500d9b FT |
988 | /* The chip now waits for BUS FREE phase. Then after the 800 ns |
989 | * Bus Free Delay, arbitration will begin. | |
990 | */ | |
1da177e4 | 991 | |
11d2f63b | 992 | spin_unlock_irq(&hostdata->lock); |
b32ade12 FT |
993 | err = NCR5380_poll_politely2(instance, MODE_REG, MR_ARBITRATE, 0, |
994 | INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, | |
995 | ICR_ARBITRATION_PROGRESS, HZ); | |
11d2f63b | 996 | spin_lock_irq(&hostdata->lock); |
b32ade12 FT |
997 | if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) { |
998 | /* Reselection interrupt */ | |
707d62b3 | 999 | goto out; |
b32ade12 | 1000 | } |
ccf6efd7 FT |
1001 | if (!hostdata->selecting) { |
1002 | /* Command was aborted */ | |
1003 | NCR5380_write(MODE_REG, MR_BASE); | |
1004 | goto out; | |
1005 | } | |
b32ade12 FT |
1006 | if (err < 0) { |
1007 | NCR5380_write(MODE_REG, MR_BASE); | |
1008 | shost_printk(KERN_ERR, instance, | |
1009 | "select: arbitration timeout\n"); | |
707d62b3 | 1010 | goto out; |
1da177e4 | 1011 | } |
11d2f63b | 1012 | spin_unlock_irq(&hostdata->lock); |
1da177e4 | 1013 | |
55500d9b | 1014 | /* The SCSI-2 arbitration delay is 2.4 us */ |
1da177e4 LT |
1015 | udelay(3); |
1016 | ||
1017 | /* Check for lost arbitration */ | |
0d2cf867 FT |
1018 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || |
1019 | (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || | |
1020 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { | |
1da177e4 | 1021 | NCR5380_write(MODE_REG, MR_BASE); |
b746545f | 1022 | dsprintk(NDEBUG_ARBITRATION, instance, "lost arbitration, deasserting MR_ARBITRATE\n"); |
11d2f63b | 1023 | spin_lock_irq(&hostdata->lock); |
707d62b3 | 1024 | goto out; |
1da177e4 | 1025 | } |
cf13b083 FT |
1026 | |
1027 | /* After/during arbitration, BSY should be asserted. | |
1028 | * IBM DPES-31080 Version S31Q works now | |
1029 | * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) | |
1030 | */ | |
1031 | NCR5380_write(INITIATOR_COMMAND_REG, | |
1032 | ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY); | |
1da177e4 | 1033 | |
aff0cf9a FT |
1034 | /* |
1035 | * Again, bus clear + bus settle time is 1.2us, however, this is | |
1da177e4 LT |
1036 | * a minimum so we'll udelay ceil(1.2) |
1037 | */ | |
1038 | ||
9c3f0e2b FT |
1039 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) |
1040 | udelay(15); | |
1041 | else | |
1042 | udelay(2); | |
1da177e4 | 1043 | |
11d2f63b FT |
1044 | spin_lock_irq(&hostdata->lock); |
1045 | ||
72064a78 FT |
1046 | /* NCR5380_reselect() clears MODE_REG after a reselection interrupt */ |
1047 | if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) | |
707d62b3 FT |
1048 | goto out; |
1049 | ||
1050 | if (!hostdata->selecting) { | |
1051 | NCR5380_write(MODE_REG, MR_BASE); | |
1052 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1053 | goto out; | |
1054 | } | |
72064a78 | 1055 | |
b746545f | 1056 | dsprintk(NDEBUG_ARBITRATION, instance, "won arbitration\n"); |
1da177e4 | 1057 | |
aff0cf9a FT |
1058 | /* |
1059 | * Now that we have won arbitration, start Selection process, asserting | |
1da177e4 LT |
1060 | * the host and target ID's on the SCSI bus. |
1061 | */ | |
1062 | ||
3d07d22b | 1063 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask | (1 << scmd_id(cmd))); |
1da177e4 | 1064 | |
aff0cf9a | 1065 | /* |
1da177e4 LT |
1066 | * Raise ATN while SEL is true before BSY goes false from arbitration, |
1067 | * since this is the only way to guarantee that we'll get a MESSAGE OUT | |
1068 | * phase immediately after selection. | |
1069 | */ | |
1070 | ||
3d07d22b FT |
1071 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY | |
1072 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL); | |
1da177e4 LT |
1073 | NCR5380_write(MODE_REG, MR_BASE); |
1074 | ||
aff0cf9a | 1075 | /* |
1da177e4 LT |
1076 | * Reselect interrupts must be turned off prior to the dropping of BSY, |
1077 | * otherwise we will trigger an interrupt. | |
1078 | */ | |
1079 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1080 | ||
11d2f63b FT |
1081 | spin_unlock_irq(&hostdata->lock); |
1082 | ||
1da177e4 | 1083 | /* |
aff0cf9a | 1084 | * The initiator shall then wait at least two deskew delays and release |
1da177e4 LT |
1085 | * the BSY signal. |
1086 | */ | |
0d2cf867 | 1087 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ |
1da177e4 LT |
1088 | |
1089 | /* Reset BSY */ | |
3d07d22b FT |
1090 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | |
1091 | ICR_ASSERT_ATN | ICR_ASSERT_SEL); | |
1da177e4 | 1092 | |
aff0cf9a | 1093 | /* |
1da177e4 | 1094 | * Something weird happens when we cease to drive BSY - looks |
aff0cf9a | 1095 | * like the board/chip is letting us do another read before the |
1da177e4 LT |
1096 | * appropriate propagation delay has expired, and we're confusing |
1097 | * a BSY signal from ourselves as the target's response to SELECTION. | |
1098 | * | |
1099 | * A small delay (the 'C++' frontend breaks the pipeline with an | |
1100 | * unnecessary jump, making it work on my 386-33/Trantor T128, the | |
aff0cf9a FT |
1101 | * tighter 'C' code breaks and requires this) solves the problem - |
1102 | * the 1 us delay is arbitrary, and only used because this delay will | |
1103 | * be the same on other platforms and since it works here, it should | |
1da177e4 LT |
1104 | * work there. |
1105 | * | |
1106 | * wingel suggests that this could be due to failing to wait | |
1107 | * one deskew delay. | |
1108 | */ | |
1109 | ||
1110 | udelay(1); | |
1111 | ||
b746545f | 1112 | dsprintk(NDEBUG_SELECTION, instance, "selecting target %d\n", scmd_id(cmd)); |
1da177e4 | 1113 | |
aff0cf9a FT |
1114 | /* |
1115 | * The SCSI specification calls for a 250 ms timeout for the actual | |
1da177e4 LT |
1116 | * selection. |
1117 | */ | |
1118 | ||
ae753a33 FT |
1119 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, SR_BSY, |
1120 | msecs_to_jiffies(250)); | |
1da177e4 | 1121 | |
1da177e4 | 1122 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { |
11d2f63b | 1123 | spin_lock_irq(&hostdata->lock); |
1da177e4 LT |
1124 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
1125 | NCR5380_reselect(instance); | |
cd400825 FT |
1126 | if (!hostdata->connected) |
1127 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
6a6ff4ac | 1128 | shost_printk(KERN_ERR, instance, "reselection after won arbitration?\n"); |
707d62b3 | 1129 | goto out; |
1da177e4 | 1130 | } |
ae753a33 FT |
1131 | |
1132 | if (err < 0) { | |
11d2f63b | 1133 | spin_lock_irq(&hostdata->lock); |
ae753a33 | 1134 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
ae753a33 | 1135 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
707d62b3 FT |
1136 | /* Can't touch cmd if it has been reclaimed by the scsi ML */ |
1137 | if (hostdata->selecting) { | |
1138 | cmd->result = DID_BAD_TARGET << 16; | |
1139 | complete_cmd(instance, cmd); | |
1140 | dsprintk(NDEBUG_SELECTION, instance, "target did not respond within 250ms\n"); | |
1141 | cmd = NULL; | |
1142 | } | |
1143 | goto out; | |
ae753a33 FT |
1144 | } |
1145 | ||
aff0cf9a FT |
1146 | /* |
1147 | * No less than two deskew delays after the initiator detects the | |
1148 | * BSY signal is true, it shall release the SEL signal and may | |
1da177e4 LT |
1149 | * change the DATA BUS. -wingel |
1150 | */ | |
1151 | ||
1152 | udelay(1); | |
1153 | ||
1154 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1155 | ||
1da177e4 | 1156 | /* |
aff0cf9a | 1157 | * Since we followed the SCSI spec, and raised ATN while SEL |
1da177e4 LT |
1158 | * was true but before BSY was false during selection, the information |
1159 | * transfer phase should be a MESSAGE OUT phase so that we can send the | |
1160 | * IDENTIFY message. | |
aff0cf9a | 1161 | * |
1da177e4 LT |
1162 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG |
1163 | * message (2 bytes) with a tag ID that we increment with every command | |
1164 | * until it wraps back to 0. | |
1165 | * | |
1166 | * XXX - it turns out that there are some broken SCSI-II devices, | |
594d4ba3 FT |
1167 | * which claim to support tagged queuing but fail when more than |
1168 | * some number of commands are issued at once. | |
1da177e4 LT |
1169 | */ |
1170 | ||
1171 | /* Wait for start of REQ/ACK handshake */ | |
1172 | ||
1da177e4 | 1173 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); |
11d2f63b | 1174 | spin_lock_irq(&hostdata->lock); |
1cc160e1 | 1175 | if (err < 0) { |
55500d9b FT |
1176 | shost_printk(KERN_ERR, instance, "select: REQ timeout\n"); |
1177 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1da177e4 | 1178 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
707d62b3 FT |
1179 | goto out; |
1180 | } | |
1181 | if (!hostdata->selecting) { | |
1182 | do_abort(instance); | |
1183 | goto out; | |
1da177e4 LT |
1184 | } |
1185 | ||
b746545f FT |
1186 | dsprintk(NDEBUG_SELECTION, instance, "target %d selected, going into MESSAGE OUT phase.\n", |
1187 | scmd_id(cmd)); | |
22f5f10d | 1188 | tmp[0] = IDENTIFY(((instance->irq == NO_IRQ) ? 0 : 1), cmd->device->lun); |
1da177e4 LT |
1189 | |
1190 | len = 1; | |
1191 | cmd->tag = 0; | |
1192 | ||
1193 | /* Send message(s) */ | |
1194 | data = tmp; | |
1195 | phase = PHASE_MSGOUT; | |
1196 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
b746545f | 1197 | dsprintk(NDEBUG_SELECTION, instance, "nexus established.\n"); |
1da177e4 | 1198 | /* XXX need to handle errors here */ |
11d2f63b | 1199 | |
1da177e4 | 1200 | hostdata->connected = cmd; |
3d07d22b | 1201 | hostdata->busy[cmd->device->id] |= 1 << cmd->device->lun; |
1da177e4 | 1202 | |
28424d3a | 1203 | initialize_SCp(cmd); |
1da177e4 | 1204 | |
707d62b3 FT |
1205 | cmd = NULL; |
1206 | ||
1207 | out: | |
1208 | if (!hostdata->selecting) | |
1209 | return NULL; | |
1210 | hostdata->selecting = NULL; | |
1211 | return cmd; | |
1da177e4 LT |
1212 | } |
1213 | ||
aff0cf9a FT |
1214 | /* |
1215 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, | |
594d4ba3 | 1216 | * unsigned char *phase, int *count, unsigned char **data) |
1da177e4 LT |
1217 | * |
1218 | * Purpose : transfers data in given phase using polled I/O | |
1219 | * | |
aff0cf9a | 1220 | * Inputs : instance - instance of driver, *phase - pointer to |
594d4ba3 FT |
1221 | * what phase is expected, *count - pointer to number of |
1222 | * bytes to transfer, **data - pointer to data pointer. | |
aff0cf9a | 1223 | * |
1da177e4 | 1224 | * Returns : -1 when different phase is entered without transferring |
0d2cf867 | 1225 | * maximum number of bytes, 0 if all bytes are transferred or exit |
594d4ba3 | 1226 | * is in same phase. |
1da177e4 | 1227 | * |
594d4ba3 | 1228 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1229 | * |
1230 | * XXX Note : handling for bus free may be useful. | |
1231 | */ | |
1232 | ||
1233 | /* | |
aff0cf9a | 1234 | * Note : this code is not as quick as it could be, however it |
1da177e4 LT |
1235 | * IS 100% reliable, and for the actual data transfer where speed |
1236 | * counts, we will always do a pseudo DMA or DMA transfer. | |
1237 | */ | |
1238 | ||
0d2cf867 FT |
1239 | static int NCR5380_transfer_pio(struct Scsi_Host *instance, |
1240 | unsigned char *phase, int *count, | |
1241 | unsigned char **data) | |
1242 | { | |
1da177e4 LT |
1243 | unsigned char p = *phase, tmp; |
1244 | int c = *count; | |
1245 | unsigned char *d = *data; | |
1da177e4 | 1246 | |
aff0cf9a FT |
1247 | /* |
1248 | * The NCR5380 chip will only drive the SCSI bus when the | |
1da177e4 LT |
1249 | * phase specified in the appropriate bits of the TARGET COMMAND |
1250 | * REGISTER match the STATUS REGISTER | |
1251 | */ | |
1252 | ||
0d2cf867 | 1253 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1da177e4 | 1254 | |
1da177e4 | 1255 | do { |
aff0cf9a FT |
1256 | /* |
1257 | * Wait for assertion of REQ, after which the phase bits will be | |
1258 | * valid | |
1da177e4 LT |
1259 | */ |
1260 | ||
686f3990 | 1261 | if (NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ) < 0) |
1da177e4 | 1262 | break; |
1da177e4 | 1263 | |
b746545f | 1264 | dsprintk(NDEBUG_HANDSHAKE, instance, "REQ asserted\n"); |
1da177e4 LT |
1265 | |
1266 | /* Check for phase mismatch */ | |
686f3990 | 1267 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) != p) { |
b746545f FT |
1268 | dsprintk(NDEBUG_PIO, instance, "phase mismatch\n"); |
1269 | NCR5380_dprint_phase(NDEBUG_PIO, instance); | |
1da177e4 LT |
1270 | break; |
1271 | } | |
0d2cf867 | 1272 | |
1da177e4 LT |
1273 | /* Do actual transfer from SCSI bus to / from memory */ |
1274 | if (!(p & SR_IO)) | |
1275 | NCR5380_write(OUTPUT_DATA_REG, *d); | |
1276 | else | |
1277 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
1278 | ||
1279 | ++d; | |
1280 | ||
aff0cf9a | 1281 | /* |
1da177e4 LT |
1282 | * The SCSI standard suggests that in MSGOUT phase, the initiator |
1283 | * should drop ATN on the last byte of the message phase | |
1284 | * after REQ has been asserted for the handshake but before | |
1285 | * the initiator raises ACK. | |
1286 | */ | |
1287 | ||
1288 | if (!(p & SR_IO)) { | |
1289 | if (!((p & SR_MSG) && c > 1)) { | |
1290 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1291 | NCR5380_dprint(NDEBUG_PIO, instance); | |
3d07d22b FT |
1292 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1293 | ICR_ASSERT_DATA | ICR_ASSERT_ACK); | |
1da177e4 | 1294 | } else { |
3d07d22b FT |
1295 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1296 | ICR_ASSERT_DATA | ICR_ASSERT_ATN); | |
1da177e4 | 1297 | NCR5380_dprint(NDEBUG_PIO, instance); |
3d07d22b FT |
1298 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1299 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1da177e4 LT |
1300 | } |
1301 | } else { | |
1302 | NCR5380_dprint(NDEBUG_PIO, instance); | |
1303 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); | |
1304 | } | |
1305 | ||
a2edc4a6 FT |
1306 | if (NCR5380_poll_politely(instance, |
1307 | STATUS_REG, SR_REQ, 0, 5 * HZ) < 0) | |
1308 | break; | |
1309 | ||
b746545f | 1310 | dsprintk(NDEBUG_HANDSHAKE, instance, "REQ negated, handshake complete\n"); |
1da177e4 LT |
1311 | |
1312 | /* | |
aff0cf9a FT |
1313 | * We have several special cases to consider during REQ/ACK handshaking : |
1314 | * 1. We were in MSGOUT phase, and we are on the last byte of the | |
594d4ba3 | 1315 | * message. ATN must be dropped as ACK is dropped. |
1da177e4 | 1316 | * |
aff0cf9a | 1317 | * 2. We are in a MSGIN phase, and we are on the last byte of the |
594d4ba3 FT |
1318 | * message. We must exit with ACK asserted, so that the calling |
1319 | * code may raise ATN before dropping ACK to reject the message. | |
1da177e4 LT |
1320 | * |
1321 | * 3. ACK and ATN are clear and the target may proceed as normal. | |
1322 | */ | |
1323 | if (!(p == PHASE_MSGIN && c == 1)) { | |
1324 | if (p == PHASE_MSGOUT && c > 1) | |
1325 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1326 | else | |
1327 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1328 | } | |
1329 | } while (--c); | |
1330 | ||
b746545f | 1331 | dsprintk(NDEBUG_PIO, instance, "residual %d\n", c); |
1da177e4 LT |
1332 | |
1333 | *count = c; | |
1334 | *data = d; | |
1335 | tmp = NCR5380_read(STATUS_REG); | |
a2edc4a6 FT |
1336 | /* The phase read from the bus is valid if either REQ is (already) |
1337 | * asserted or if ACK hasn't been released yet. The latter applies if | |
1338 | * we're in MSG IN, DATA IN or STATUS and all bytes have been received. | |
1339 | */ | |
1340 | if ((tmp & SR_REQ) || ((tmp & SR_IO) && c == 0)) | |
1da177e4 LT |
1341 | *phase = tmp & PHASE_MASK; |
1342 | else | |
1343 | *phase = PHASE_UNKNOWN; | |
1344 | ||
1345 | if (!c || (*phase == p)) | |
1346 | return 0; | |
1347 | else | |
1348 | return -1; | |
1349 | } | |
1350 | ||
1351 | /** | |
636b1ec8 FT |
1352 | * do_reset - issue a reset command |
1353 | * @instance: adapter to reset | |
1da177e4 | 1354 | * |
636b1ec8 FT |
1355 | * Issue a reset sequence to the NCR5380 and try and get the bus |
1356 | * back into sane shape. | |
1da177e4 | 1357 | * |
636b1ec8 FT |
1358 | * This clears the reset interrupt flag because there may be no handler for |
1359 | * it. When the driver is initialized, the NCR5380_intr() handler has not yet | |
1360 | * been installed. And when in EH we may have released the ST DMA interrupt. | |
1da177e4 | 1361 | */ |
aff0cf9a | 1362 | |
54d8fe44 FT |
1363 | static void do_reset(struct Scsi_Host *instance) |
1364 | { | |
636b1ec8 FT |
1365 | unsigned long flags; |
1366 | ||
1367 | local_irq_save(flags); | |
1368 | NCR5380_write(TARGET_COMMAND_REG, | |
1369 | PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); | |
1da177e4 | 1370 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); |
636b1ec8 | 1371 | udelay(50); |
1da177e4 | 1372 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
636b1ec8 FT |
1373 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1374 | local_irq_restore(flags); | |
1da177e4 LT |
1375 | } |
1376 | ||
80d3eb6d FT |
1377 | /** |
1378 | * do_abort - abort the currently established nexus by going to | |
1379 | * MESSAGE OUT phase and sending an ABORT message. | |
1380 | * @instance: relevant scsi host instance | |
1da177e4 | 1381 | * |
80d3eb6d | 1382 | * Returns 0 on success, -1 on failure. |
1da177e4 LT |
1383 | */ |
1384 | ||
54d8fe44 FT |
1385 | static int do_abort(struct Scsi_Host *instance) |
1386 | { | |
1da177e4 LT |
1387 | unsigned char *msgptr, phase, tmp; |
1388 | int len; | |
1389 | int rc; | |
1da177e4 LT |
1390 | |
1391 | /* Request message out phase */ | |
1392 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1393 | ||
aff0cf9a FT |
1394 | /* |
1395 | * Wait for the target to indicate a valid phase by asserting | |
1396 | * REQ. Once this happens, we'll have either a MSGOUT phase | |
1397 | * and can immediately send the ABORT message, or we'll have some | |
1da177e4 | 1398 | * other phase and will have to source/sink data. |
aff0cf9a | 1399 | * |
1da177e4 LT |
1400 | * We really don't care what value was on the bus or what value |
1401 | * the target sees, so we just handshake. | |
1402 | */ | |
1403 | ||
80d3eb6d | 1404 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 10 * HZ); |
1cc160e1 | 1405 | if (rc < 0) |
80d3eb6d | 1406 | goto timeout; |
1da177e4 | 1407 | |
f35d3474 | 1408 | tmp = NCR5380_read(STATUS_REG) & PHASE_MASK; |
aff0cf9a | 1409 | |
1da177e4 LT |
1410 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); |
1411 | ||
f35d3474 | 1412 | if (tmp != PHASE_MSGOUT) { |
0d2cf867 FT |
1413 | NCR5380_write(INITIATOR_COMMAND_REG, |
1414 | ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
54d8fe44 | 1415 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 3 * HZ); |
1cc160e1 | 1416 | if (rc < 0) |
80d3eb6d FT |
1417 | goto timeout; |
1418 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1da177e4 | 1419 | } |
0d2cf867 | 1420 | |
1da177e4 LT |
1421 | tmp = ABORT; |
1422 | msgptr = &tmp; | |
1423 | len = 1; | |
1424 | phase = PHASE_MSGOUT; | |
54d8fe44 | 1425 | NCR5380_transfer_pio(instance, &phase, &len, &msgptr); |
1da177e4 LT |
1426 | |
1427 | /* | |
1428 | * If we got here, and the command completed successfully, | |
1429 | * we're about to go into bus free state. | |
1430 | */ | |
1431 | ||
1432 | return len ? -1 : 0; | |
80d3eb6d FT |
1433 | |
1434 | timeout: | |
1435 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1436 | return -1; | |
1da177e4 LT |
1437 | } |
1438 | ||
e4dec680 | 1439 | #if defined(PSEUDO_DMA) |
aff0cf9a FT |
1440 | /* |
1441 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, | |
594d4ba3 | 1442 | * unsigned char *phase, int *count, unsigned char **data) |
1da177e4 LT |
1443 | * |
1444 | * Purpose : transfers data in given phase using either real | |
594d4ba3 | 1445 | * or pseudo DMA. |
1da177e4 | 1446 | * |
aff0cf9a | 1447 | * Inputs : instance - instance of driver, *phase - pointer to |
594d4ba3 FT |
1448 | * what phase is expected, *count - pointer to number of |
1449 | * bytes to transfer, **data - pointer to data pointer. | |
aff0cf9a | 1450 | * |
1da177e4 | 1451 | * Returns : -1 when different phase is entered without transferring |
594d4ba3 FT |
1452 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1453 | * is in same phase. | |
1da177e4 | 1454 | * |
594d4ba3 | 1455 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1456 | */ |
1457 | ||
1458 | ||
0d2cf867 FT |
1459 | static int NCR5380_transfer_dma(struct Scsi_Host *instance, |
1460 | unsigned char *phase, int *count, | |
1461 | unsigned char **data) | |
1462 | { | |
1463 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
1da177e4 LT |
1464 | register int c = *count; |
1465 | register unsigned char p = *phase; | |
1466 | register unsigned char *d = *data; | |
1467 | unsigned char tmp; | |
1468 | int foo; | |
1da177e4 | 1469 | |
1da177e4 LT |
1470 | if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { |
1471 | *phase = tmp; | |
1472 | return -1; | |
1473 | } | |
1da177e4 LT |
1474 | |
1475 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); | |
1476 | ||
1da177e4 LT |
1477 | /* |
1478 | * Note : on my sample board, watch-dog timeouts occurred when interrupts | |
aff0cf9a | 1479 | * were not disabled for the duration of a single DMA transfer, from |
1da177e4 LT |
1480 | * before the setting of DMA mode to after transfer of the last byte. |
1481 | */ | |
1482 | ||
55181be8 | 1483 | if (hostdata->flags & FLAG_NO_DMA_FIXUP) |
cd400825 FT |
1484 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | |
1485 | MR_ENABLE_EOP_INTR); | |
1da177e4 | 1486 | else |
cd400825 | 1487 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY); |
1da177e4 | 1488 | |
52a6a1cb | 1489 | dprintk(NDEBUG_DMA, "scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG)); |
1da177e4 | 1490 | |
aff0cf9a | 1491 | /* |
594d4ba3 FT |
1492 | * On the PAS16 at least I/O recovery delays are not needed here. |
1493 | * Everyone else seems to want them. | |
1da177e4 LT |
1494 | */ |
1495 | ||
1496 | if (p & SR_IO) { | |
1497 | io_recovery_delay(1); | |
1498 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); | |
1499 | } else { | |
1500 | io_recovery_delay(1); | |
1501 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1502 | io_recovery_delay(1); | |
1503 | NCR5380_write(START_DMA_SEND_REG, 0); | |
1504 | io_recovery_delay(1); | |
1505 | } | |
1506 | ||
1da177e4 | 1507 | /* |
e4dec680 | 1508 | * A note regarding the DMA errata workarounds for early NMOS silicon. |
c16df32e FT |
1509 | * |
1510 | * For DMA sends, we want to wait until the last byte has been | |
1511 | * transferred out over the bus before we turn off DMA mode. Alas, there | |
1512 | * seems to be no terribly good way of doing this on a 5380 under all | |
1513 | * conditions. For non-scatter-gather operations, we can wait until REQ | |
1514 | * and ACK both go false, or until a phase mismatch occurs. Gather-sends | |
1515 | * are nastier, since the device will be expecting more data than we | |
1516 | * are prepared to send it, and REQ will remain asserted. On a 53C8[01] we | |
1517 | * could test Last Byte Sent to assure transfer (I imagine this is precisely | |
1518 | * why this signal was added to the newer chips) but on the older 538[01] | |
1519 | * this signal does not exist. The workaround for this lack is a watchdog; | |
1520 | * we bail out of the wait-loop after a modest amount of wait-time if | |
1521 | * the usual exit conditions are not met. Not a terribly clean or | |
1522 | * correct solution :-% | |
1523 | * | |
1524 | * DMA receive is equally tricky due to a nasty characteristic of the NCR5380. | |
1525 | * If the chip is in DMA receive mode, it will respond to a target's | |
1526 | * REQ by latching the SCSI data into the INPUT DATA register and asserting | |
1527 | * ACK, even if it has _already_ been notified by the DMA controller that | |
1528 | * the current DMA transfer has completed! If the NCR5380 is then taken | |
1529 | * out of DMA mode, this already-acknowledged byte is lost. This is | |
1530 | * not a problem for "one DMA transfer per READ command", because | |
1531 | * the situation will never arise... either all of the data is DMA'ed | |
1532 | * properly, or the target switches to MESSAGE IN phase to signal a | |
1533 | * disconnection (either operation bringing the DMA to a clean halt). | |
1534 | * However, in order to handle scatter-receive, we must work around the | |
e4dec680 | 1535 | * problem. The chosen fix is to DMA fewer bytes, then check for the |
c16df32e FT |
1536 | * condition before taking the NCR5380 out of DMA mode. One or two extra |
1537 | * bytes are transferred via PIO as necessary to fill out the original | |
1538 | * request. | |
1da177e4 LT |
1539 | */ |
1540 | ||
1da177e4 | 1541 | if (p & SR_IO) { |
55181be8 FT |
1542 | foo = NCR5380_pread(instance, d, |
1543 | hostdata->flags & FLAG_NO_DMA_FIXUP ? c : c - 1); | |
1544 | if (!foo && !(hostdata->flags & FLAG_NO_DMA_FIXUP)) { | |
1da177e4 | 1545 | /* |
e4dec680 | 1546 | * The workaround was to transfer fewer bytes than we |
aff0cf9a | 1547 | * intended to with the pseudo-DMA read function, wait for |
1da177e4 LT |
1548 | * the chip to latch the last byte, read it, and then disable |
1549 | * pseudo-DMA mode. | |
aff0cf9a | 1550 | * |
1da177e4 LT |
1551 | * After REQ is asserted, the NCR5380 asserts DRQ and ACK. |
1552 | * REQ is deasserted when ACK is asserted, and not reasserted | |
1553 | * until ACK goes false. Since the NCR5380 won't lower ACK | |
1554 | * until DACK is asserted, which won't happen unless we twiddle | |
aff0cf9a FT |
1555 | * the DMA port or we take the NCR5380 out of DMA mode, we |
1556 | * can guarantee that we won't handshake another extra | |
1da177e4 LT |
1557 | * byte. |
1558 | */ | |
1559 | ||
55181be8 FT |
1560 | if (NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, |
1561 | BASR_DRQ, BASR_DRQ, HZ) < 0) { | |
1562 | foo = -1; | |
1563 | shost_printk(KERN_ERR, instance, "PDMA read: DRQ timeout\n"); | |
1564 | } | |
1565 | if (NCR5380_poll_politely(instance, STATUS_REG, | |
1566 | SR_REQ, 0, HZ) < 0) { | |
1567 | foo = -1; | |
1568 | shost_printk(KERN_ERR, instance, "PDMA read: !REQ timeout\n"); | |
1da177e4 | 1569 | } |
55181be8 | 1570 | d[c - 1] = NCR5380_read(INPUT_DATA_REG); |
1da177e4 | 1571 | } |
1da177e4 | 1572 | } else { |
1da177e4 | 1573 | foo = NCR5380_pwrite(instance, d, c); |
55181be8 | 1574 | if (!foo && !(hostdata->flags & FLAG_NO_DMA_FIXUP)) { |
1da177e4 | 1575 | /* |
aff0cf9a FT |
1576 | * Wait for the last byte to be sent. If REQ is being asserted for |
1577 | * the byte we're interested, we'll ACK it and it will go false. | |
1da177e4 | 1578 | */ |
55181be8 FT |
1579 | if (NCR5380_poll_politely2(instance, |
1580 | BUS_AND_STATUS_REG, BASR_DRQ, BASR_DRQ, | |
1581 | BUS_AND_STATUS_REG, BASR_PHASE_MATCH, 0, HZ) < 0) { | |
1582 | foo = -1; | |
1583 | shost_printk(KERN_ERR, instance, "PDMA write: DRQ and phase timeout\n"); | |
1da177e4 LT |
1584 | } |
1585 | } | |
1da177e4 LT |
1586 | } |
1587 | NCR5380_write(MODE_REG, MR_BASE); | |
1588 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
cd400825 | 1589 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1da177e4 LT |
1590 | *data = d + c; |
1591 | *count = 0; | |
1592 | *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; | |
1da177e4 | 1593 | return foo; |
1da177e4 | 1594 | } |
e4dec680 | 1595 | #endif /* PSEUDO_DMA */ |
1da177e4 LT |
1596 | |
1597 | /* | |
1598 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) | |
1599 | * | |
aff0cf9a | 1600 | * Purpose : run through the various SCSI phases and do as the target |
594d4ba3 FT |
1601 | * directs us to. Operates on the currently connected command, |
1602 | * instance->connected. | |
1da177e4 LT |
1603 | * |
1604 | * Inputs : instance, instance for which we are doing commands | |
1605 | * | |
aff0cf9a | 1606 | * Side effects : SCSI things happen, the disconnected queue will be |
594d4ba3 FT |
1607 | * modified if a command disconnects, *instance->connected will |
1608 | * change. | |
1da177e4 | 1609 | * |
aff0cf9a | 1610 | * XXX Note : we need to watch for bus free or a reset condition here |
594d4ba3 | 1611 | * to recover from an unexpected bus free condition. |
1da177e4 LT |
1612 | */ |
1613 | ||
0d2cf867 FT |
1614 | static void NCR5380_information_transfer(struct Scsi_Host *instance) |
1615 | { | |
e8a60144 | 1616 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
1da177e4 LT |
1617 | unsigned char msgout = NOP; |
1618 | int sink = 0; | |
1619 | int len; | |
1da177e4 | 1620 | int transfersize; |
1da177e4 LT |
1621 | unsigned char *data; |
1622 | unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; | |
11d2f63b | 1623 | struct scsi_cmnd *cmd; |
1da177e4 | 1624 | |
11d2f63b | 1625 | while ((cmd = hostdata->connected)) { |
32b26a10 FT |
1626 | struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); |
1627 | ||
1da177e4 LT |
1628 | tmp = NCR5380_read(STATUS_REG); |
1629 | /* We only have a valid SCSI phase when REQ is asserted */ | |
1630 | if (tmp & SR_REQ) { | |
1631 | phase = (tmp & PHASE_MASK); | |
1632 | if (phase != old_phase) { | |
1633 | old_phase = phase; | |
1634 | NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); | |
1635 | } | |
1636 | if (sink && (phase != PHASE_MSGOUT)) { | |
1637 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1638 | ||
3d07d22b FT |
1639 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | |
1640 | ICR_ASSERT_ACK); | |
0d2cf867 FT |
1641 | while (NCR5380_read(STATUS_REG) & SR_REQ) |
1642 | ; | |
3d07d22b FT |
1643 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1644 | ICR_ASSERT_ATN); | |
1da177e4 LT |
1645 | sink = 0; |
1646 | continue; | |
1647 | } | |
0d2cf867 | 1648 | |
1da177e4 | 1649 | switch (phase) { |
1da177e4 LT |
1650 | case PHASE_DATAOUT: |
1651 | #if (NDEBUG & NDEBUG_NO_DATAOUT) | |
6a6ff4ac | 1652 | shost_printk(KERN_DEBUG, instance, "NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n"); |
1da177e4 LT |
1653 | sink = 1; |
1654 | do_abort(instance); | |
1655 | cmd->result = DID_ERROR << 16; | |
677e0194 | 1656 | complete_cmd(instance, cmd); |
dc183965 | 1657 | hostdata->connected = NULL; |
1da177e4 LT |
1658 | return; |
1659 | #endif | |
bf1a0c6f | 1660 | case PHASE_DATAIN: |
aff0cf9a | 1661 | /* |
1da177e4 LT |
1662 | * If there is no room left in the current buffer in the |
1663 | * scatter-gather list, move onto the next one. | |
1664 | */ | |
1665 | ||
1666 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1667 | ++cmd->SCp.buffer; | |
1668 | --cmd->SCp.buffers_residual; | |
1669 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
45711f1a | 1670 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
b746545f FT |
1671 | dsprintk(NDEBUG_INFORMATION, instance, "%d bytes and %d buffers left\n", |
1672 | cmd->SCp.this_residual, | |
1673 | cmd->SCp.buffers_residual); | |
1da177e4 | 1674 | } |
0d2cf867 | 1675 | |
1da177e4 | 1676 | /* |
aff0cf9a | 1677 | * The preferred transfer method is going to be |
1da177e4 LT |
1678 | * PSEUDO-DMA for systems that are strictly PIO, |
1679 | * since we can let the hardware do the handshaking. | |
1680 | * | |
1681 | * For this to work, we need to know the transfersize | |
1682 | * ahead of time, since the pseudo-DMA code will sit | |
1683 | * in an unconditional loop. | |
1684 | */ | |
1685 | ||
e4dec680 | 1686 | #if defined(PSEUDO_DMA) |
ff3d4578 | 1687 | transfersize = 0; |
7e9ec8d9 | 1688 | if (!cmd->device->borken) |
ff3d4578 FT |
1689 | transfersize = NCR5380_dma_xfer_len(instance, cmd, phase); |
1690 | ||
1691 | if (transfersize) { | |
1da177e4 | 1692 | len = transfersize; |
0d2cf867 FT |
1693 | if (NCR5380_transfer_dma(instance, &phase, |
1694 | &len, (unsigned char **)&cmd->SCp.ptr)) { | |
1da177e4 | 1695 | /* |
0d2cf867 FT |
1696 | * If the watchdog timer fires, all future |
1697 | * accesses to this device will use the | |
1698 | * polled-IO. | |
1da177e4 | 1699 | */ |
017560fc | 1700 | scmd_printk(KERN_INFO, cmd, |
0d2cf867 | 1701 | "switching to slow handshake\n"); |
1da177e4 | 1702 | cmd->device->borken = 1; |
1da177e4 LT |
1703 | sink = 1; |
1704 | do_abort(instance); | |
1705 | cmd->result = DID_ERROR << 16; | |
1da177e4 LT |
1706 | /* XXX - need to source or sink data here, as appropriate */ |
1707 | } else | |
1708 | cmd->SCp.this_residual -= transfersize - len; | |
1709 | } else | |
e4dec680 | 1710 | #endif /* PSEUDO_DMA */ |
11d2f63b | 1711 | { |
1678847e FT |
1712 | /* Break up transfer into 3 ms chunks, |
1713 | * presuming 6 accesses per handshake. | |
1714 | */ | |
1715 | transfersize = min((unsigned long)cmd->SCp.this_residual, | |
1716 | hostdata->accesses_per_ms / 2); | |
1717 | len = transfersize; | |
1718 | NCR5380_transfer_pio(instance, &phase, &len, | |
3d07d22b | 1719 | (unsigned char **)&cmd->SCp.ptr); |
1678847e | 1720 | cmd->SCp.this_residual -= transfersize - len; |
11d2f63b | 1721 | } |
1678847e | 1722 | return; |
1da177e4 LT |
1723 | case PHASE_MSGIN: |
1724 | len = 1; | |
1725 | data = &tmp; | |
1726 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
1727 | cmd->SCp.Message = tmp; | |
1728 | ||
1729 | switch (tmp) { | |
1da177e4 LT |
1730 | case ABORT: |
1731 | case COMMAND_COMPLETE: | |
1732 | /* Accept message by clearing ACK */ | |
1733 | sink = 1; | |
1734 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
0d3d9a42 FT |
1735 | dsprintk(NDEBUG_QUEUES, instance, |
1736 | "COMMAND COMPLETE %p target %d lun %llu\n", | |
1737 | cmd, scmd_id(cmd), cmd->device->lun); | |
1738 | ||
1da177e4 | 1739 | hostdata->connected = NULL; |
1da177e4 | 1740 | |
f27db8eb FT |
1741 | cmd->result &= ~0xffff; |
1742 | cmd->result |= cmd->SCp.Status; | |
1743 | cmd->result |= cmd->SCp.Message << 8; | |
28424d3a | 1744 | |
f27db8eb | 1745 | if (cmd->cmnd[0] == REQUEST_SENSE) |
677e0194 | 1746 | complete_cmd(instance, cmd); |
f27db8eb FT |
1747 | else { |
1748 | if (cmd->SCp.Status == SAM_STAT_CHECK_CONDITION || | |
1749 | cmd->SCp.Status == SAM_STAT_COMMAND_TERMINATED) { | |
1750 | dsprintk(NDEBUG_QUEUES, instance, "autosense: adding cmd %p to tail of autosense queue\n", | |
1751 | cmd); | |
1752 | list_add_tail(&ncmd->list, | |
1753 | &hostdata->autosense); | |
1754 | } else | |
1755 | complete_cmd(instance, cmd); | |
1da177e4 LT |
1756 | } |
1757 | ||
aff0cf9a FT |
1758 | /* |
1759 | * Restore phase bits to 0 so an interrupted selection, | |
1da177e4 LT |
1760 | * arbitration can resume. |
1761 | */ | |
1762 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
72064a78 FT |
1763 | |
1764 | /* Enable reselect interrupts */ | |
1765 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1da177e4 LT |
1766 | return; |
1767 | case MESSAGE_REJECT: | |
1768 | /* Accept message by clearing ACK */ | |
1769 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1770 | switch (hostdata->last_message) { | |
1771 | case HEAD_OF_QUEUE_TAG: | |
1772 | case ORDERED_QUEUE_TAG: | |
1773 | case SIMPLE_QUEUE_TAG: | |
1774 | cmd->device->simple_tags = 0; | |
9cb78c16 | 1775 | hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF)); |
1da177e4 LT |
1776 | break; |
1777 | default: | |
1778 | break; | |
1779 | } | |
340b9612 | 1780 | break; |
0d2cf867 FT |
1781 | case DISCONNECT: |
1782 | /* Accept message by clearing ACK */ | |
1783 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1784 | hostdata->connected = NULL; | |
1785 | list_add(&ncmd->list, &hostdata->disconnected); | |
1786 | dsprintk(NDEBUG_INFORMATION | NDEBUG_QUEUES, | |
1787 | instance, "connected command %p for target %d lun %llu moved to disconnected queue\n", | |
1788 | cmd, scmd_id(cmd), cmd->device->lun); | |
0d3d9a42 | 1789 | |
0d2cf867 FT |
1790 | /* |
1791 | * Restore phase bits to 0 so an interrupted selection, | |
1792 | * arbitration can resume. | |
1793 | */ | |
1794 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
1da177e4 | 1795 | |
0d2cf867 FT |
1796 | /* Enable reselect interrupts */ |
1797 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1798 | return; | |
aff0cf9a | 1799 | /* |
1da177e4 | 1800 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect |
aff0cf9a | 1801 | * operation, in violation of the SCSI spec so we can safely |
1da177e4 LT |
1802 | * ignore SAVE/RESTORE pointers calls. |
1803 | * | |
aff0cf9a | 1804 | * Unfortunately, some disks violate the SCSI spec and |
1da177e4 | 1805 | * don't issue the required SAVE_POINTERS message before |
aff0cf9a | 1806 | * disconnecting, and we have to break spec to remain |
1da177e4 LT |
1807 | * compatible. |
1808 | */ | |
1809 | case SAVE_POINTERS: | |
1810 | case RESTORE_POINTERS: | |
1811 | /* Accept message by clearing ACK */ | |
1812 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1813 | break; | |
1814 | case EXTENDED_MESSAGE: | |
c16df32e FT |
1815 | /* |
1816 | * Start the message buffer with the EXTENDED_MESSAGE | |
1817 | * byte, since spi_print_msg() wants the whole thing. | |
1818 | */ | |
1da177e4 LT |
1819 | extended_msg[0] = EXTENDED_MESSAGE; |
1820 | /* Accept first byte by clearing ACK */ | |
1821 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
11d2f63b FT |
1822 | |
1823 | spin_unlock_irq(&hostdata->lock); | |
1824 | ||
b746545f | 1825 | dsprintk(NDEBUG_EXTENDED, instance, "receiving extended message\n"); |
1da177e4 LT |
1826 | |
1827 | len = 2; | |
1828 | data = extended_msg + 1; | |
1829 | phase = PHASE_MSGIN; | |
1830 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
b746545f FT |
1831 | dsprintk(NDEBUG_EXTENDED, instance, "length %d, code 0x%02x\n", |
1832 | (int)extended_msg[1], | |
1833 | (int)extended_msg[2]); | |
1da177e4 | 1834 | |
e0783ed3 FT |
1835 | if (!len && extended_msg[1] > 0 && |
1836 | extended_msg[1] <= sizeof(extended_msg) - 2) { | |
1da177e4 LT |
1837 | /* Accept third byte by clearing ACK */ |
1838 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1839 | len = extended_msg[1] - 1; | |
1840 | data = extended_msg + 3; | |
1841 | phase = PHASE_MSGIN; | |
1842 | ||
1843 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
b746545f FT |
1844 | dsprintk(NDEBUG_EXTENDED, instance, "message received, residual %d\n", |
1845 | len); | |
1da177e4 LT |
1846 | |
1847 | switch (extended_msg[2]) { | |
1848 | case EXTENDED_SDTR: | |
1849 | case EXTENDED_WDTR: | |
1850 | case EXTENDED_MODIFY_DATA_POINTER: | |
1851 | case EXTENDED_EXTENDED_IDENTIFY: | |
1852 | tmp = 0; | |
1853 | } | |
1854 | } else if (len) { | |
6a6ff4ac | 1855 | shost_printk(KERN_ERR, instance, "error receiving extended message\n"); |
1da177e4 LT |
1856 | tmp = 0; |
1857 | } else { | |
6a6ff4ac FT |
1858 | shost_printk(KERN_NOTICE, instance, "extended message code %02x length %d is too long\n", |
1859 | extended_msg[2], extended_msg[1]); | |
1da177e4 LT |
1860 | tmp = 0; |
1861 | } | |
11d2f63b FT |
1862 | |
1863 | spin_lock_irq(&hostdata->lock); | |
1864 | if (!hostdata->connected) | |
1865 | return; | |
1866 | ||
1da177e4 LT |
1867 | /* Fall through to reject message */ |
1868 | ||
aff0cf9a FT |
1869 | /* |
1870 | * If we get something weird that we aren't expecting, | |
1da177e4 LT |
1871 | * reject it. |
1872 | */ | |
1873 | default: | |
1874 | if (!tmp) { | |
6a6ff4ac | 1875 | shost_printk(KERN_ERR, instance, "rejecting message "); |
1abfd370 | 1876 | spi_print_msg(extended_msg); |
1da177e4 LT |
1877 | printk("\n"); |
1878 | } else if (tmp != EXTENDED_MESSAGE) | |
017560fc | 1879 | scmd_printk(KERN_INFO, cmd, |
0d2cf867 FT |
1880 | "rejecting unknown message %02x\n", |
1881 | tmp); | |
1da177e4 | 1882 | else |
017560fc | 1883 | scmd_printk(KERN_INFO, cmd, |
0d2cf867 FT |
1884 | "rejecting unknown extended message code %02x, length %d\n", |
1885 | extended_msg[1], extended_msg[0]); | |
1da177e4 LT |
1886 | |
1887 | msgout = MESSAGE_REJECT; | |
1888 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1889 | break; | |
0d2cf867 | 1890 | } /* switch (tmp) */ |
1da177e4 LT |
1891 | break; |
1892 | case PHASE_MSGOUT: | |
1893 | len = 1; | |
1894 | data = &msgout; | |
1895 | hostdata->last_message = msgout; | |
1896 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
1897 | if (msgout == ABORT) { | |
1da177e4 LT |
1898 | hostdata->connected = NULL; |
1899 | cmd->result = DID_ERROR << 16; | |
677e0194 | 1900 | complete_cmd(instance, cmd); |
1da177e4 LT |
1901 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
1902 | return; | |
1903 | } | |
1904 | msgout = NOP; | |
1905 | break; | |
1906 | case PHASE_CMDOUT: | |
1907 | len = cmd->cmd_len; | |
1908 | data = cmd->cmnd; | |
aff0cf9a FT |
1909 | /* |
1910 | * XXX for performance reasons, on machines with a | |
1911 | * PSEUDO-DMA architecture we should probably | |
1912 | * use the dma transfer function. | |
1da177e4 LT |
1913 | */ |
1914 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
1da177e4 LT |
1915 | break; |
1916 | case PHASE_STATIN: | |
1917 | len = 1; | |
1918 | data = &tmp; | |
1919 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
1920 | cmd->SCp.Status = tmp; | |
1921 | break; | |
1922 | default: | |
6a6ff4ac | 1923 | shost_printk(KERN_ERR, instance, "unknown phase\n"); |
4dde8f7d | 1924 | NCR5380_dprint(NDEBUG_ANY, instance); |
0d2cf867 | 1925 | } /* switch(phase) */ |
686f3990 | 1926 | } else { |
11d2f63b | 1927 | spin_unlock_irq(&hostdata->lock); |
686f3990 | 1928 | NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); |
11d2f63b | 1929 | spin_lock_irq(&hostdata->lock); |
1da177e4 | 1930 | } |
11d2f63b | 1931 | } |
1da177e4 LT |
1932 | } |
1933 | ||
1934 | /* | |
1935 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) | |
1936 | * | |
aff0cf9a | 1937 | * Purpose : does reselection, initializing the instance->connected |
594d4ba3 FT |
1938 | * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q |
1939 | * nexus has been reestablished, | |
aff0cf9a | 1940 | * |
1da177e4 | 1941 | * Inputs : instance - this instance of the NCR5380. |
1da177e4 LT |
1942 | */ |
1943 | ||
0d2cf867 FT |
1944 | static void NCR5380_reselect(struct Scsi_Host *instance) |
1945 | { | |
e8a60144 | 1946 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
1da177e4 LT |
1947 | unsigned char target_mask; |
1948 | unsigned char lun, phase; | |
1949 | int len; | |
1950 | unsigned char msg[3]; | |
1951 | unsigned char *data; | |
32b26a10 FT |
1952 | struct NCR5380_cmd *ncmd; |
1953 | struct scsi_cmnd *tmp; | |
1da177e4 LT |
1954 | |
1955 | /* | |
1956 | * Disable arbitration, etc. since the host adapter obviously | |
1957 | * lost, and tell an interrupted NCR5380_select() to restart. | |
1958 | */ | |
1959 | ||
1960 | NCR5380_write(MODE_REG, MR_BASE); | |
1da177e4 LT |
1961 | |
1962 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); | |
b746545f FT |
1963 | |
1964 | dsprintk(NDEBUG_RESELECTION, instance, "reselect\n"); | |
1da177e4 | 1965 | |
aff0cf9a | 1966 | /* |
1da177e4 LT |
1967 | * At this point, we have detected that our SCSI ID is on the bus, |
1968 | * SEL is true and BSY was false for at least one bus settle delay | |
1969 | * (400 ns). | |
1970 | * | |
1971 | * We must assert BSY ourselves, until the target drops the SEL | |
1972 | * signal. | |
1973 | */ | |
1974 | ||
1975 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); | |
72064a78 FT |
1976 | if (NCR5380_poll_politely(instance, |
1977 | STATUS_REG, SR_SEL, 0, 2 * HZ) < 0) { | |
1978 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1979 | return; | |
1980 | } | |
1da177e4 LT |
1981 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
1982 | ||
1983 | /* | |
1984 | * Wait for target to go into MSGIN. | |
1da177e4 LT |
1985 | */ |
1986 | ||
1cc160e1 | 1987 | if (NCR5380_poll_politely(instance, |
72064a78 FT |
1988 | STATUS_REG, SR_REQ, SR_REQ, 2 * HZ) < 0) { |
1989 | do_abort(instance); | |
1990 | return; | |
1991 | } | |
1da177e4 LT |
1992 | |
1993 | len = 1; | |
1994 | data = msg; | |
1995 | phase = PHASE_MSGIN; | |
1996 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
1997 | ||
72064a78 FT |
1998 | if (len) { |
1999 | do_abort(instance); | |
2000 | return; | |
2001 | } | |
2002 | ||
1da177e4 | 2003 | if (!(msg[0] & 0x80)) { |
72064a78 | 2004 | shost_printk(KERN_ERR, instance, "expecting IDENTIFY message, got "); |
1abfd370 | 2005 | spi_print_msg(msg); |
72064a78 FT |
2006 | printk("\n"); |
2007 | do_abort(instance); | |
2008 | return; | |
2009 | } | |
2010 | lun = msg[0] & 0x07; | |
1da177e4 | 2011 | |
72064a78 FT |
2012 | /* |
2013 | * We need to add code for SCSI-II to track which devices have | |
2014 | * I_T_L_Q nexuses established, and which have simple I_T_L | |
2015 | * nexuses so we can chose to do additional data transfer. | |
2016 | */ | |
1da177e4 | 2017 | |
72064a78 FT |
2018 | /* |
2019 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we | |
2020 | * just reestablished, and remove it from the disconnected queue. | |
2021 | */ | |
1da177e4 | 2022 | |
32b26a10 FT |
2023 | tmp = NULL; |
2024 | list_for_each_entry(ncmd, &hostdata->disconnected, list) { | |
2025 | struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd); | |
2026 | ||
2027 | if (target_mask == (1 << scmd_id(cmd)) && | |
2028 | lun == (u8)cmd->device->lun) { | |
2029 | list_del(&ncmd->list); | |
2030 | tmp = cmd; | |
72064a78 | 2031 | break; |
1da177e4 LT |
2032 | } |
2033 | } | |
0d3d9a42 FT |
2034 | |
2035 | if (tmp) { | |
2036 | dsprintk(NDEBUG_RESELECTION | NDEBUG_QUEUES, instance, | |
2037 | "reselect: removed %p from disconnected queue\n", tmp); | |
2038 | } else { | |
72064a78 FT |
2039 | shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d not in disconnected queue.\n", |
2040 | target_mask, lun); | |
2041 | /* | |
0d2cf867 FT |
2042 | * Since we have an established nexus that we can't do anything |
2043 | * with, we must abort it. | |
72064a78 | 2044 | */ |
1da177e4 | 2045 | do_abort(instance); |
72064a78 | 2046 | return; |
1da177e4 | 2047 | } |
72064a78 FT |
2048 | |
2049 | /* Accept message by clearing ACK */ | |
2050 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2051 | ||
2052 | hostdata->connected = tmp; | |
b746545f FT |
2053 | dsprintk(NDEBUG_RESELECTION, instance, "nexus established, target %d, lun %llu, tag %d\n", |
2054 | scmd_id(tmp), tmp->device->lun, tmp->tag); | |
1da177e4 LT |
2055 | } |
2056 | ||
8b00c3d5 FT |
2057 | /** |
2058 | * list_find_cmd - test for presence of a command in a linked list | |
2059 | * @haystack: list of commands | |
2060 | * @needle: command to search for | |
2061 | */ | |
2062 | ||
2063 | static bool list_find_cmd(struct list_head *haystack, | |
2064 | struct scsi_cmnd *needle) | |
2065 | { | |
2066 | struct NCR5380_cmd *ncmd; | |
2067 | ||
2068 | list_for_each_entry(ncmd, haystack, list) | |
2069 | if (NCR5380_to_scmd(ncmd) == needle) | |
2070 | return true; | |
2071 | return false; | |
2072 | } | |
2073 | ||
2074 | /** | |
2075 | * list_remove_cmd - remove a command from linked list | |
2076 | * @haystack: list of commands | |
2077 | * @needle: command to remove | |
2078 | */ | |
2079 | ||
2080 | static bool list_del_cmd(struct list_head *haystack, | |
2081 | struct scsi_cmnd *needle) | |
2082 | { | |
2083 | if (list_find_cmd(haystack, needle)) { | |
2084 | struct NCR5380_cmd *ncmd = scsi_cmd_priv(needle); | |
2085 | ||
2086 | list_del(&ncmd->list); | |
2087 | return true; | |
2088 | } | |
2089 | return false; | |
2090 | } | |
2091 | ||
2092 | /** | |
2093 | * NCR5380_abort - scsi host eh_abort_handler() method | |
2094 | * @cmd: the command to be aborted | |
2095 | * | |
2096 | * Try to abort a given command by removing it from queues and/or sending | |
2097 | * the target an abort message. This may not succeed in causing a target | |
2098 | * to abort the command. Nonetheless, the low-level driver must forget about | |
2099 | * the command because the mid-layer reclaims it and it may be re-issued. | |
2100 | * | |
2101 | * The normal path taken by a command is as follows. For EH we trace this | |
2102 | * same path to locate and abort the command. | |
2103 | * | |
2104 | * unissued -> selecting -> [unissued -> selecting ->]... connected -> | |
2105 | * [disconnected -> connected ->]... | |
2106 | * [autosense -> connected ->] done | |
2107 | * | |
8b00c3d5 FT |
2108 | * If cmd was not found at all then presumably it has already been completed, |
2109 | * in which case return SUCCESS to try to avoid further EH measures. | |
dc183965 | 2110 | * |
8b00c3d5 | 2111 | * If the command has not completed yet, we must not fail to find it. |
dc183965 FT |
2112 | * We have no option but to forget the aborted command (even if it still |
2113 | * lacks sense data). The mid-layer may re-issue a command that is in error | |
2114 | * recovery (see scsi_send_eh_cmnd), but the logic and data structures in | |
2115 | * this driver are such that a command can appear on one queue only. | |
71a00593 FT |
2116 | * |
2117 | * The lock protects driver data structures, but EH handlers also use it | |
2118 | * to serialize their own execution and prevent their own re-entry. | |
1da177e4 LT |
2119 | */ |
2120 | ||
710ddd0d FT |
2121 | static int NCR5380_abort(struct scsi_cmnd *cmd) |
2122 | { | |
1da177e4 | 2123 | struct Scsi_Host *instance = cmd->device->host; |
e8a60144 | 2124 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
11d2f63b | 2125 | unsigned long flags; |
8b00c3d5 | 2126 | int result = SUCCESS; |
1fa6b5fb | 2127 | |
11d2f63b FT |
2128 | spin_lock_irqsave(&hostdata->lock, flags); |
2129 | ||
32b26a10 | 2130 | #if (NDEBUG & NDEBUG_ANY) |
8b00c3d5 | 2131 | scmd_printk(KERN_INFO, cmd, __func__); |
32b26a10 | 2132 | #endif |
e5c3fddf FT |
2133 | NCR5380_dprint(NDEBUG_ANY, instance); |
2134 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
1da177e4 | 2135 | |
8b00c3d5 FT |
2136 | if (list_del_cmd(&hostdata->unissued, cmd)) { |
2137 | dsprintk(NDEBUG_ABORT, instance, | |
2138 | "abort: removed %p from issue queue\n", cmd); | |
2139 | cmd->result = DID_ABORT << 16; | |
2140 | cmd->scsi_done(cmd); /* No tag or busy flag to worry about */ | |
dc183965 | 2141 | goto out; |
8b00c3d5 FT |
2142 | } |
2143 | ||
707d62b3 FT |
2144 | if (hostdata->selecting == cmd) { |
2145 | dsprintk(NDEBUG_ABORT, instance, | |
2146 | "abort: cmd %p == selecting\n", cmd); | |
2147 | hostdata->selecting = NULL; | |
2148 | cmd->result = DID_ABORT << 16; | |
2149 | complete_cmd(instance, cmd); | |
2150 | goto out; | |
2151 | } | |
2152 | ||
8b00c3d5 FT |
2153 | if (list_del_cmd(&hostdata->disconnected, cmd)) { |
2154 | dsprintk(NDEBUG_ABORT, instance, | |
2155 | "abort: removed %p from disconnected list\n", cmd); | |
71a00593 FT |
2156 | /* Can't call NCR5380_select() and send ABORT because that |
2157 | * means releasing the lock. Need a bus reset. | |
2158 | */ | |
dc183965 FT |
2159 | set_host_byte(cmd, DID_ERROR); |
2160 | complete_cmd(instance, cmd); | |
71a00593 FT |
2161 | result = FAILED; |
2162 | goto out; | |
8b00c3d5 FT |
2163 | } |
2164 | ||
2165 | if (hostdata->connected == cmd) { | |
2166 | dsprintk(NDEBUG_ABORT, instance, "abort: cmd %p is connected\n", cmd); | |
2167 | hostdata->connected = NULL; | |
8b00c3d5 | 2168 | hostdata->dma_len = 0; |
8b00c3d5 FT |
2169 | if (do_abort(instance)) { |
2170 | set_host_byte(cmd, DID_ERROR); | |
2171 | complete_cmd(instance, cmd); | |
2172 | result = FAILED; | |
2173 | goto out; | |
2174 | } | |
2175 | set_host_byte(cmd, DID_ABORT); | |
dc183965 FT |
2176 | complete_cmd(instance, cmd); |
2177 | goto out; | |
2178 | } | |
2179 | ||
2180 | if (list_del_cmd(&hostdata->autosense, cmd)) { | |
2181 | dsprintk(NDEBUG_ABORT, instance, | |
2182 | "abort: removed %p from sense queue\n", cmd); | |
2183 | set_host_byte(cmd, DID_ERROR); | |
8b00c3d5 FT |
2184 | complete_cmd(instance, cmd); |
2185 | } | |
2186 | ||
2187 | out: | |
2188 | if (result == FAILED) | |
2189 | dsprintk(NDEBUG_ABORT, instance, "abort: failed to abort %p\n", cmd); | |
2190 | else | |
2191 | dsprintk(NDEBUG_ABORT, instance, "abort: successfully aborted %p\n", cmd); | |
2192 | ||
2193 | queue_work(hostdata->work_q, &hostdata->main_task); | |
11d2f63b | 2194 | spin_unlock_irqrestore(&hostdata->lock, flags); |
32b26a10 | 2195 | |
8b00c3d5 | 2196 | return result; |
1da177e4 LT |
2197 | } |
2198 | ||
2199 | ||
3be1b3ea FT |
2200 | /** |
2201 | * NCR5380_bus_reset - reset the SCSI bus | |
2202 | * @cmd: SCSI command undergoing EH | |
1da177e4 | 2203 | * |
3be1b3ea | 2204 | * Returns SUCCESS |
1da177e4 LT |
2205 | */ |
2206 | ||
710ddd0d | 2207 | static int NCR5380_bus_reset(struct scsi_cmnd *cmd) |
68b3aa7c JG |
2208 | { |
2209 | struct Scsi_Host *instance = cmd->device->host; | |
11d2f63b | 2210 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
62717f53 | 2211 | int i; |
11d2f63b | 2212 | unsigned long flags; |
62717f53 | 2213 | struct NCR5380_cmd *ncmd; |
68b3aa7c | 2214 | |
11d2f63b | 2215 | spin_lock_irqsave(&hostdata->lock, flags); |
3be1b3ea FT |
2216 | |
2217 | #if (NDEBUG & NDEBUG_ANY) | |
62717f53 | 2218 | scmd_printk(KERN_INFO, cmd, __func__); |
3be1b3ea | 2219 | #endif |
e5c3fddf FT |
2220 | NCR5380_dprint(NDEBUG_ANY, instance); |
2221 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
68b3aa7c | 2222 | |
68b3aa7c | 2223 | do_reset(instance); |
3be1b3ea | 2224 | |
62717f53 FT |
2225 | /* reset NCR registers */ |
2226 | NCR5380_write(MODE_REG, MR_BASE); | |
2227 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2228 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
2229 | ||
2230 | /* After the reset, there are no more connected or disconnected commands | |
2231 | * and no busy units; so clear the low-level status here to avoid | |
2232 | * conflicts when the mid-level code tries to wake up the affected | |
2233 | * commands! | |
2234 | */ | |
2235 | ||
1884c283 FT |
2236 | if (list_del_cmd(&hostdata->unissued, cmd)) { |
2237 | cmd->result = DID_RESET << 16; | |
2238 | cmd->scsi_done(cmd); | |
2239 | } | |
2240 | ||
2241 | if (hostdata->selecting) { | |
2242 | hostdata->selecting->result = DID_RESET << 16; | |
2243 | complete_cmd(instance, hostdata->selecting); | |
2244 | hostdata->selecting = NULL; | |
2245 | } | |
62717f53 FT |
2246 | |
2247 | list_for_each_entry(ncmd, &hostdata->disconnected, list) { | |
2248 | struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd); | |
2249 | ||
2250 | set_host_byte(cmd, DID_RESET); | |
2251 | cmd->scsi_done(cmd); | |
2252 | } | |
1884c283 | 2253 | INIT_LIST_HEAD(&hostdata->disconnected); |
62717f53 FT |
2254 | |
2255 | list_for_each_entry(ncmd, &hostdata->autosense, list) { | |
2256 | struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd); | |
2257 | ||
2258 | set_host_byte(cmd, DID_RESET); | |
2259 | cmd->scsi_done(cmd); | |
2260 | } | |
1884c283 | 2261 | INIT_LIST_HEAD(&hostdata->autosense); |
62717f53 FT |
2262 | |
2263 | if (hostdata->connected) { | |
2264 | set_host_byte(hostdata->connected, DID_RESET); | |
2265 | complete_cmd(instance, hostdata->connected); | |
2266 | hostdata->connected = NULL; | |
2267 | } | |
2268 | ||
62717f53 FT |
2269 | for (i = 0; i < 8; ++i) |
2270 | hostdata->busy[i] = 0; | |
62717f53 | 2271 | hostdata->dma_len = 0; |
62717f53 FT |
2272 | |
2273 | queue_work(hostdata->work_q, &hostdata->main_task); | |
11d2f63b | 2274 | spin_unlock_irqrestore(&hostdata->lock, flags); |
1da177e4 | 2275 | |
1da177e4 LT |
2276 | return SUCCESS; |
2277 | } |