Commit | Line | Data |
---|---|---|
594c16d8 BZ |
1 | /* |
2 | * ATAPI support. | |
3 | */ | |
4 | ||
5 | #include <linux/kernel.h> | |
6 | #include <linux/delay.h> | |
7 | #include <linux/ide.h> | |
646c0cb6 BZ |
8 | #include <scsi/scsi.h> |
9 | ||
10 | #ifdef DEBUG | |
11 | #define debug_log(fmt, args...) \ | |
12 | printk(KERN_INFO "ide: " fmt, ## args) | |
13 | #else | |
14 | #define debug_log(fmt, args...) do {} while (0) | |
15 | #endif | |
16 | ||
51509eec BZ |
17 | /* |
18 | * Check whether we can support a device, | |
19 | * based on the ATAPI IDENTIFY command results. | |
20 | */ | |
21 | int ide_check_atapi_device(ide_drive_t *drive, const char *s) | |
22 | { | |
23 | u16 *id = drive->id; | |
24 | u8 gcw[2], protocol, device_type, removable, drq_type, packet_size; | |
25 | ||
26 | *((u16 *)&gcw) = id[ATA_ID_CONFIG]; | |
27 | ||
28 | protocol = (gcw[1] & 0xC0) >> 6; | |
29 | device_type = gcw[1] & 0x1F; | |
30 | removable = (gcw[0] & 0x80) >> 7; | |
31 | drq_type = (gcw[0] & 0x60) >> 5; | |
32 | packet_size = gcw[0] & 0x03; | |
33 | ||
34 | #ifdef CONFIG_PPC | |
35 | /* kludge for Apple PowerBook internal zip */ | |
36 | if (drive->media == ide_floppy && device_type == 5 && | |
37 | !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") && | |
38 | strstr((char *)&id[ATA_ID_PROD], "ZIP")) | |
39 | device_type = 0; | |
40 | #endif | |
41 | ||
42 | if (protocol != 2) | |
43 | printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n", | |
44 | s, drive->name, protocol); | |
45 | else if ((drive->media == ide_floppy && device_type != 0) || | |
46 | (drive->media == ide_tape && device_type != 1)) | |
47 | printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n", | |
48 | s, drive->name, device_type); | |
49 | else if (removable == 0) | |
50 | printk(KERN_ERR "%s: %s: the removable flag is not set\n", | |
51 | s, drive->name); | |
52 | else if (drive->media == ide_floppy && drq_type == 3) | |
53 | printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not " | |
54 | "supported\n", s, drive->name, drq_type); | |
55 | else if (packet_size != 0) | |
56 | printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 " | |
57 | "bytes\n", s, drive->name, packet_size); | |
58 | else | |
59 | return 1; | |
60 | return 0; | |
61 | } | |
62 | EXPORT_SYMBOL_GPL(ide_check_atapi_device); | |
63 | ||
acaa0f5f BZ |
64 | /* PIO data transfer routine using the scatter gather table. */ |
65 | int ide_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, | |
66 | unsigned int bcount, int write) | |
67 | { | |
68 | ide_hwif_t *hwif = drive->hwif; | |
69 | const struct ide_tp_ops *tp_ops = hwif->tp_ops; | |
70 | xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data; | |
71 | struct scatterlist *sg = pc->sg; | |
72 | char *buf; | |
73 | int count, done = 0; | |
74 | ||
75 | while (bcount) { | |
76 | count = min(sg->length - pc->b_count, bcount); | |
77 | ||
78 | if (PageHighMem(sg_page(sg))) { | |
79 | unsigned long flags; | |
80 | ||
81 | local_irq_save(flags); | |
82 | buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset; | |
83 | xf(drive, NULL, buf + pc->b_count, count); | |
84 | kunmap_atomic(buf - sg->offset, KM_IRQ0); | |
85 | local_irq_restore(flags); | |
86 | } else { | |
87 | buf = sg_virt(sg); | |
88 | xf(drive, NULL, buf + pc->b_count, count); | |
89 | } | |
90 | ||
91 | bcount -= count; | |
92 | pc->b_count += count; | |
93 | done += count; | |
94 | ||
95 | if (pc->b_count == sg->length) { | |
96 | if (!--pc->sg_cnt) | |
97 | break; | |
98 | pc->sg = sg = sg_next(sg); | |
99 | pc->b_count = 0; | |
100 | } | |
101 | } | |
102 | ||
103 | if (bcount) { | |
104 | printk(KERN_ERR "%s: %d leftover bytes, %s\n", drive->name, | |
105 | bcount, write ? "padding with zeros" | |
106 | : "discarding data"); | |
107 | ide_pad_transfer(drive, write, bcount); | |
108 | } | |
109 | ||
110 | return done; | |
111 | } | |
112 | EXPORT_SYMBOL_GPL(ide_io_buffers); | |
113 | ||
7bf7420a BZ |
114 | void ide_init_pc(struct ide_atapi_pc *pc) |
115 | { | |
116 | memset(pc, 0, sizeof(*pc)); | |
117 | pc->buf = pc->pc_buf; | |
118 | pc->buf_size = IDE_PC_BUFFER_SIZE; | |
119 | } | |
120 | EXPORT_SYMBOL_GPL(ide_init_pc); | |
121 | ||
7645c151 BZ |
122 | /* |
123 | * Generate a new packet command request in front of the request queue, before | |
124 | * the current request, so that it will be processed immediately, on the next | |
125 | * pass through the driver. | |
126 | */ | |
127 | void ide_queue_pc_head(ide_drive_t *drive, struct gendisk *disk, | |
128 | struct ide_atapi_pc *pc, struct request *rq) | |
129 | { | |
130 | blk_rq_init(NULL, rq); | |
131 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
132 | rq->cmd_flags |= REQ_PREEMPT; | |
133 | rq->buffer = (char *)pc; | |
134 | rq->rq_disk = disk; | |
135 | memcpy(rq->cmd, pc->c, 12); | |
136 | if (drive->media == ide_tape) | |
137 | rq->cmd[13] = REQ_IDETAPE_PC1; | |
138 | ide_do_drive_cmd(drive, rq); | |
139 | } | |
140 | EXPORT_SYMBOL_GPL(ide_queue_pc_head); | |
141 | ||
2ac07d92 BZ |
142 | /* |
143 | * Add a special packet command request to the tail of the request queue, | |
144 | * and wait for it to be serviced. | |
145 | */ | |
146 | int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk, | |
147 | struct ide_atapi_pc *pc) | |
148 | { | |
149 | struct request *rq; | |
150 | int error; | |
151 | ||
152 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); | |
153 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
154 | rq->buffer = (char *)pc; | |
155 | memcpy(rq->cmd, pc->c, 12); | |
156 | if (drive->media == ide_tape) | |
157 | rq->cmd[13] = REQ_IDETAPE_PC1; | |
158 | error = blk_execute_rq(drive->queue, disk, rq, 0); | |
159 | blk_put_request(rq); | |
160 | ||
161 | return error; | |
162 | } | |
163 | EXPORT_SYMBOL_GPL(ide_queue_pc_tail); | |
164 | ||
de699ad5 BZ |
165 | int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk) |
166 | { | |
167 | struct ide_atapi_pc pc; | |
168 | ||
169 | ide_init_pc(&pc); | |
170 | pc.c[0] = TEST_UNIT_READY; | |
171 | ||
172 | return ide_queue_pc_tail(drive, disk, &pc); | |
173 | } | |
174 | EXPORT_SYMBOL_GPL(ide_do_test_unit_ready); | |
175 | ||
0c8a6c7a BZ |
176 | int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start) |
177 | { | |
178 | struct ide_atapi_pc pc; | |
179 | ||
180 | ide_init_pc(&pc); | |
181 | pc.c[0] = START_STOP; | |
182 | pc.c[4] = start; | |
183 | ||
184 | if (drive->media == ide_tape) | |
185 | pc.flags |= PC_FLAG_WAIT_FOR_DSC; | |
186 | ||
187 | return ide_queue_pc_tail(drive, disk, &pc); | |
188 | } | |
189 | EXPORT_SYMBOL_GPL(ide_do_start_stop); | |
190 | ||
0578042d BZ |
191 | int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on) |
192 | { | |
193 | struct ide_atapi_pc pc; | |
194 | ||
195 | if (drive->atapi_flags & IDE_AFLAG_NO_DOORLOCK) | |
196 | return 0; | |
197 | ||
198 | ide_init_pc(&pc); | |
199 | pc.c[0] = ALLOW_MEDIUM_REMOVAL; | |
200 | pc.c[4] = on; | |
201 | ||
202 | return ide_queue_pc_tail(drive, disk, &pc); | |
203 | } | |
204 | EXPORT_SYMBOL_GPL(ide_set_media_lock); | |
205 | ||
844b9468 BZ |
206 | int ide_scsi_expiry(ide_drive_t *drive) |
207 | { | |
208 | struct ide_atapi_pc *pc = drive->pc; | |
209 | ||
210 | debug_log("%s called for %lu at %lu\n", __func__, | |
211 | pc->scsi_cmd->serial_number, jiffies); | |
212 | ||
213 | pc->flags |= PC_FLAG_TIMEDOUT; | |
214 | ||
215 | return 0; /* we do not want the IDE subsystem to retry */ | |
216 | } | |
217 | EXPORT_SYMBOL_GPL(ide_scsi_expiry); | |
218 | ||
646c0cb6 | 219 | /* TODO: unify the code thus making some arguments go away */ |
844b9468 | 220 | ide_startstop_t ide_pc_intr(ide_drive_t *drive, ide_handler_t *handler, |
646c0cb6 | 221 | void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *), |
b14c7212 | 222 | void (*retry_pc)(ide_drive_t *), |
acaa0f5f | 223 | int (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int)) |
646c0cb6 | 224 | { |
2b9efba4 | 225 | struct ide_atapi_pc *pc = drive->pc; |
646c0cb6 | 226 | ide_hwif_t *hwif = drive->hwif; |
8fccf899 | 227 | struct request *rq = hwif->hwgroup->rq; |
374e042c | 228 | const struct ide_tp_ops *tp_ops = hwif->tp_ops; |
646c0cb6 | 229 | xfer_func_t *xferfunc; |
844b9468 BZ |
230 | ide_expiry_t *expiry; |
231 | unsigned int timeout, temp; | |
646c0cb6 | 232 | u16 bcount; |
b14c7212 | 233 | u8 stat, ireason, scsi = drive->scsi, dsc = 0; |
646c0cb6 BZ |
234 | |
235 | debug_log("Enter %s - interrupt handler\n", __func__); | |
236 | ||
844b9468 BZ |
237 | if (scsi) { |
238 | timeout = ide_scsi_get_timeout(pc); | |
239 | expiry = ide_scsi_expiry; | |
240 | } else { | |
241 | timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD | |
242 | : WAIT_TAPE_CMD; | |
243 | expiry = NULL; | |
244 | } | |
245 | ||
646c0cb6 | 246 | if (pc->flags & PC_FLAG_TIMEDOUT) { |
b14c7212 | 247 | drive->pc_callback(drive, 0); |
646c0cb6 BZ |
248 | return ide_stopped; |
249 | } | |
250 | ||
251 | /* Clear the interrupt */ | |
374e042c | 252 | stat = tp_ops->read_status(hwif); |
646c0cb6 BZ |
253 | |
254 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { | |
255 | if (hwif->dma_ops->dma_end(drive) || | |
3a7d2484 | 256 | (drive->media == ide_tape && !scsi && (stat & ATA_ERR))) { |
646c0cb6 BZ |
257 | if (drive->media == ide_floppy && !scsi) |
258 | printk(KERN_ERR "%s: DMA %s error\n", | |
259 | drive->name, rq_data_dir(pc->rq) | |
260 | ? "write" : "read"); | |
261 | pc->flags |= PC_FLAG_DMA_ERROR; | |
262 | } else { | |
263 | pc->xferred = pc->req_xfer; | |
264 | if (update_buffers) | |
265 | update_buffers(drive, pc); | |
266 | } | |
267 | debug_log("%s: DMA finished\n", drive->name); | |
268 | } | |
269 | ||
270 | /* No more interrupts */ | |
3a7d2484 | 271 | if ((stat & ATA_DRQ) == 0) { |
646c0cb6 BZ |
272 | debug_log("Packet command completed, %d bytes transferred\n", |
273 | pc->xferred); | |
274 | ||
275 | pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; | |
276 | ||
277 | local_irq_enable_in_hardirq(); | |
278 | ||
279 | if (drive->media == ide_tape && !scsi && | |
3a7d2484 BZ |
280 | (stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE) |
281 | stat &= ~ATA_ERR; | |
8fccf899 | 282 | |
3a7d2484 | 283 | if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) { |
646c0cb6 BZ |
284 | /* Error detected */ |
285 | debug_log("%s: I/O error\n", drive->name); | |
286 | ||
287 | if (drive->media != ide_tape || scsi) { | |
288 | pc->rq->errors++; | |
289 | if (scsi) | |
290 | goto cmd_finished; | |
291 | } | |
292 | ||
8fccf899 | 293 | if (rq->cmd[0] == REQUEST_SENSE) { |
646c0cb6 BZ |
294 | printk(KERN_ERR "%s: I/O error in request sense" |
295 | " command\n", drive->name); | |
296 | return ide_do_reset(drive); | |
297 | } | |
298 | ||
8fccf899 | 299 | debug_log("[cmd %x]: check condition\n", rq->cmd[0]); |
646c0cb6 BZ |
300 | |
301 | /* Retry operation */ | |
302 | retry_pc(drive); | |
8fccf899 | 303 | |
646c0cb6 BZ |
304 | /* queued, but not started */ |
305 | return ide_stopped; | |
306 | } | |
307 | cmd_finished: | |
308 | pc->error = 0; | |
b14c7212 BZ |
309 | |
310 | if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0) | |
311 | dsc = 1; | |
8fccf899 | 312 | |
646c0cb6 | 313 | /* Command finished - Call the callback function */ |
b14c7212 | 314 | drive->pc_callback(drive, dsc); |
8fccf899 | 315 | |
646c0cb6 BZ |
316 | return ide_stopped; |
317 | } | |
318 | ||
319 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { | |
320 | pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; | |
321 | printk(KERN_ERR "%s: The device wants to issue more interrupts " | |
322 | "in DMA mode\n", drive->name); | |
323 | ide_dma_off(drive); | |
324 | return ide_do_reset(drive); | |
325 | } | |
646c0cb6 | 326 | |
1823649b BZ |
327 | /* Get the number of bytes to transfer on this interrupt. */ |
328 | ide_read_bcount_and_ireason(drive, &bcount, &ireason); | |
646c0cb6 | 329 | |
3a7d2484 | 330 | if (ireason & ATAPI_COD) { |
646c0cb6 BZ |
331 | printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__); |
332 | return ide_do_reset(drive); | |
333 | } | |
8fccf899 | 334 | |
3a7d2484 BZ |
335 | if (((ireason & ATAPI_IO) == ATAPI_IO) == |
336 | !!(pc->flags & PC_FLAG_WRITING)) { | |
646c0cb6 BZ |
337 | /* Hopefully, we will never get here */ |
338 | printk(KERN_ERR "%s: We wanted to %s, but the device wants us " | |
339 | "to %s!\n", drive->name, | |
3a7d2484 BZ |
340 | (ireason & ATAPI_IO) ? "Write" : "Read", |
341 | (ireason & ATAPI_IO) ? "Read" : "Write"); | |
646c0cb6 BZ |
342 | return ide_do_reset(drive); |
343 | } | |
8fccf899 | 344 | |
646c0cb6 BZ |
345 | if (!(pc->flags & PC_FLAG_WRITING)) { |
346 | /* Reading - Check that we have enough space */ | |
347 | temp = pc->xferred + bcount; | |
348 | if (temp > pc->req_xfer) { | |
349 | if (temp > pc->buf_size) { | |
350 | printk(KERN_ERR "%s: The device wants to send " | |
351 | "us more data than expected - " | |
352 | "discarding data\n", | |
353 | drive->name); | |
354 | if (scsi) | |
355 | temp = pc->buf_size - pc->xferred; | |
356 | else | |
357 | temp = 0; | |
358 | if (temp) { | |
359 | if (pc->sg) | |
360 | io_buffers(drive, pc, temp, 0); | |
361 | else | |
374e042c | 362 | tp_ops->input_data(drive, NULL, |
646c0cb6 BZ |
363 | pc->cur_pos, temp); |
364 | printk(KERN_ERR "%s: transferred %d of " | |
365 | "%d bytes\n", | |
366 | drive->name, | |
367 | temp, bcount); | |
368 | } | |
369 | pc->xferred += temp; | |
370 | pc->cur_pos += temp; | |
371 | ide_pad_transfer(drive, 0, bcount - temp); | |
844b9468 | 372 | goto next_irq; |
646c0cb6 BZ |
373 | } |
374 | debug_log("The device wants to send us more data than " | |
375 | "expected - allowing transfer\n"); | |
376 | } | |
374e042c | 377 | xferfunc = tp_ops->input_data; |
646c0cb6 | 378 | } else |
374e042c | 379 | xferfunc = tp_ops->output_data; |
646c0cb6 BZ |
380 | |
381 | if ((drive->media == ide_floppy && !scsi && !pc->buf) || | |
382 | (drive->media == ide_tape && !scsi && pc->bh) || | |
acaa0f5f BZ |
383 | (scsi && pc->sg)) { |
384 | int done = io_buffers(drive, pc, bcount, | |
385 | !!(pc->flags & PC_FLAG_WRITING)); | |
386 | ||
387 | /* FIXME: don't do partial completions */ | |
388 | if (drive->media == ide_floppy && !scsi) | |
389 | ide_end_request(drive, 1, done >> 9); | |
390 | } else | |
646c0cb6 BZ |
391 | xferfunc(drive, NULL, pc->cur_pos, bcount); |
392 | ||
393 | /* Update the current position */ | |
394 | pc->xferred += bcount; | |
395 | pc->cur_pos += bcount; | |
396 | ||
397 | debug_log("[cmd %x] transferred %d bytes on that intr.\n", | |
8fccf899 | 398 | rq->cmd[0], bcount); |
844b9468 | 399 | next_irq: |
646c0cb6 BZ |
400 | /* And set the interrupt handler again */ |
401 | ide_set_handler(drive, handler, timeout, expiry); | |
402 | return ide_started; | |
403 | } | |
404 | EXPORT_SYMBOL_GPL(ide_pc_intr); | |
594c16d8 | 405 | |
88a72109 BZ |
406 | static u8 ide_read_ireason(ide_drive_t *drive) |
407 | { | |
408 | ide_task_t task; | |
409 | ||
410 | memset(&task, 0, sizeof(task)); | |
411 | task.tf_flags = IDE_TFLAG_IN_NSECT; | |
412 | ||
374e042c | 413 | drive->hwif->tp_ops->tf_read(drive, &task); |
88a72109 BZ |
414 | |
415 | return task.tf.nsect & 3; | |
416 | } | |
417 | ||
594c16d8 BZ |
418 | static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason) |
419 | { | |
594c16d8 BZ |
420 | int retries = 100; |
421 | ||
3a7d2484 BZ |
422 | while (retries-- && ((ireason & ATAPI_COD) == 0 || |
423 | (ireason & ATAPI_IO))) { | |
594c16d8 BZ |
424 | printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing " |
425 | "a packet command, retrying\n", drive->name); | |
426 | udelay(100); | |
88a72109 | 427 | ireason = ide_read_ireason(drive); |
594c16d8 BZ |
428 | if (retries == 0) { |
429 | printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing " | |
430 | "a packet command, ignoring\n", | |
431 | drive->name); | |
3a7d2484 BZ |
432 | ireason |= ATAPI_COD; |
433 | ireason &= ~ATAPI_IO; | |
594c16d8 BZ |
434 | } |
435 | } | |
436 | ||
437 | return ireason; | |
438 | } | |
439 | ||
2b9efba4 | 440 | ide_startstop_t ide_transfer_pc(ide_drive_t *drive, |
594c16d8 BZ |
441 | ide_handler_t *handler, unsigned int timeout, |
442 | ide_expiry_t *expiry) | |
443 | { | |
2b9efba4 | 444 | struct ide_atapi_pc *pc = drive->pc; |
594c16d8 | 445 | ide_hwif_t *hwif = drive->hwif; |
8fccf899 | 446 | struct request *rq = hwif->hwgroup->rq; |
594c16d8 BZ |
447 | ide_startstop_t startstop; |
448 | u8 ireason; | |
449 | ||
3a7d2484 | 450 | if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) { |
594c16d8 BZ |
451 | printk(KERN_ERR "%s: Strange, packet command initiated yet " |
452 | "DRQ isn't asserted\n", drive->name); | |
453 | return startstop; | |
454 | } | |
455 | ||
88a72109 | 456 | ireason = ide_read_ireason(drive); |
594c16d8 BZ |
457 | if (drive->media == ide_tape && !drive->scsi) |
458 | ireason = ide_wait_ireason(drive, ireason); | |
459 | ||
3a7d2484 | 460 | if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) { |
594c16d8 BZ |
461 | printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing " |
462 | "a packet command\n", drive->name); | |
463 | return ide_do_reset(drive); | |
464 | } | |
465 | ||
466 | /* Set the interrupt routine */ | |
467 | ide_set_handler(drive, handler, timeout, expiry); | |
468 | ||
469 | /* Begin DMA, if necessary */ | |
470 | if (pc->flags & PC_FLAG_DMA_OK) { | |
471 | pc->flags |= PC_FLAG_DMA_IN_PROGRESS; | |
472 | hwif->dma_ops->dma_start(drive); | |
473 | } | |
474 | ||
475 | /* Send the actual packet */ | |
ea68d270 | 476 | if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0) |
8fccf899 | 477 | hwif->tp_ops->output_data(drive, NULL, rq->cmd, 12); |
594c16d8 BZ |
478 | |
479 | return ide_started; | |
480 | } | |
481 | EXPORT_SYMBOL_GPL(ide_transfer_pc); | |
6bf1641c | 482 | |
2b9efba4 | 483 | ide_startstop_t ide_issue_pc(ide_drive_t *drive, |
6bf1641c BZ |
484 | ide_handler_t *handler, unsigned int timeout, |
485 | ide_expiry_t *expiry) | |
486 | { | |
2b9efba4 | 487 | struct ide_atapi_pc *pc = drive->pc; |
6bf1641c BZ |
488 | ide_hwif_t *hwif = drive->hwif; |
489 | u16 bcount; | |
490 | u8 dma = 0; | |
491 | ||
492 | /* We haven't transferred any data yet */ | |
493 | pc->xferred = 0; | |
494 | pc->cur_pos = pc->buf; | |
495 | ||
496 | /* Request to transfer the entire buffer at once */ | |
497 | if (drive->media == ide_tape && !drive->scsi) | |
498 | bcount = pc->req_xfer; | |
499 | else | |
500 | bcount = min(pc->req_xfer, 63 * 1024); | |
501 | ||
502 | if (pc->flags & PC_FLAG_DMA_ERROR) { | |
503 | pc->flags &= ~PC_FLAG_DMA_ERROR; | |
504 | ide_dma_off(drive); | |
505 | } | |
506 | ||
507 | if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) { | |
508 | if (drive->scsi) | |
509 | hwif->sg_mapped = 1; | |
510 | dma = !hwif->dma_ops->dma_setup(drive); | |
511 | if (drive->scsi) | |
512 | hwif->sg_mapped = 0; | |
513 | } | |
514 | ||
515 | if (!dma) | |
516 | pc->flags &= ~PC_FLAG_DMA_OK; | |
517 | ||
518 | ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE, | |
519 | bcount, dma); | |
520 | ||
521 | /* Issue the packet command */ | |
ac77ef8b | 522 | if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) { |
aaaade3f | 523 | ide_execute_command(drive, ATA_CMD_PACKET, handler, |
6bf1641c BZ |
524 | timeout, NULL); |
525 | return ide_started; | |
526 | } else { | |
527 | ide_execute_pkt_cmd(drive); | |
528 | return (*handler)(drive); | |
529 | } | |
530 | } | |
531 | EXPORT_SYMBOL_GPL(ide_issue_pc); |