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Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +02001/*
2 * ATAPI support.
3 */
4
5#include <linux/kernel.h>
6#include <linux/delay.h>
7#include <linux/ide.h>
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +02008#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
Bartlomiej Zolnierkiewicz51509ee2008-10-10 22:39:34 +020017/*
18 * Check whether we can support a device,
19 * based on the ATAPI IDENTIFY command results.
20 */
21int 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}
62EXPORT_SYMBOL_GPL(ide_check_atapi_device);
63
Bartlomiej Zolnierkiewiczacaa0f52008-10-10 22:39:36 +020064/* PIO data transfer routine using the scatter gather table. */
65int 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}
112EXPORT_SYMBOL_GPL(ide_io_buffers);
113
Bartlomiej Zolnierkiewicz7bf74202008-10-10 22:39:37 +0200114void 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}
120EXPORT_SYMBOL_GPL(ide_init_pc);
121
Bartlomiej Zolnierkiewicz7645c152008-10-10 22:39:37 +0200122/*
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 */
127void 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}
140EXPORT_SYMBOL_GPL(ide_queue_pc_head);
141
Bartlomiej Zolnierkiewicz2ac07d92008-10-10 22:39:38 +0200142/*
143 * Add a special packet command request to the tail of the request queue,
144 * and wait for it to be serviced.
145 */
146int 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}
163EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
164
Bartlomiej Zolnierkiewicz05780422008-10-10 22:39:38 +0200165int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on)
166{
167 struct ide_atapi_pc pc;
168
169 if (drive->atapi_flags & IDE_AFLAG_NO_DOORLOCK)
170 return 0;
171
172 ide_init_pc(&pc);
173 pc.c[0] = ALLOW_MEDIUM_REMOVAL;
174 pc.c[4] = on;
175
176 return ide_queue_pc_tail(drive, disk, &pc);
177}
178EXPORT_SYMBOL_GPL(ide_set_media_lock);
179
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200180/* TODO: unify the code thus making some arguments go away */
181ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc,
182 ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry,
183 void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),
184 void (*retry_pc)(ide_drive_t *), void (*dsc_handle)(ide_drive_t *),
Bartlomiej Zolnierkiewiczacaa0f52008-10-10 22:39:36 +0200185 int (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int))
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200186{
187 ide_hwif_t *hwif = drive->hwif;
Borislav Petkov8fccf892008-07-23 19:56:01 +0200188 struct request *rq = hwif->hwgroup->rq;
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200189 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200190 xfer_func_t *xferfunc;
191 unsigned int temp;
192 u16 bcount;
193 u8 stat, ireason, scsi = drive->scsi;
194
195 debug_log("Enter %s - interrupt handler\n", __func__);
196
197 if (pc->flags & PC_FLAG_TIMEDOUT) {
Borislav Petkovdb9d2862008-07-23 19:55:59 +0200198 drive->pc_callback(drive);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200199 return ide_stopped;
200 }
201
202 /* Clear the interrupt */
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200203 stat = tp_ops->read_status(hwif);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200204
205 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
206 if (hwif->dma_ops->dma_end(drive) ||
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200207 (drive->media == ide_tape && !scsi && (stat & ATA_ERR))) {
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200208 if (drive->media == ide_floppy && !scsi)
209 printk(KERN_ERR "%s: DMA %s error\n",
210 drive->name, rq_data_dir(pc->rq)
211 ? "write" : "read");
212 pc->flags |= PC_FLAG_DMA_ERROR;
213 } else {
214 pc->xferred = pc->req_xfer;
215 if (update_buffers)
216 update_buffers(drive, pc);
217 }
218 debug_log("%s: DMA finished\n", drive->name);
219 }
220
221 /* No more interrupts */
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200222 if ((stat & ATA_DRQ) == 0) {
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200223 debug_log("Packet command completed, %d bytes transferred\n",
224 pc->xferred);
225
226 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
227
228 local_irq_enable_in_hardirq();
229
230 if (drive->media == ide_tape && !scsi &&
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200231 (stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
232 stat &= ~ATA_ERR;
Borislav Petkov8fccf892008-07-23 19:56:01 +0200233
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200234 if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) {
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200235 /* Error detected */
236 debug_log("%s: I/O error\n", drive->name);
237
238 if (drive->media != ide_tape || scsi) {
239 pc->rq->errors++;
240 if (scsi)
241 goto cmd_finished;
242 }
243
Borislav Petkov8fccf892008-07-23 19:56:01 +0200244 if (rq->cmd[0] == REQUEST_SENSE) {
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200245 printk(KERN_ERR "%s: I/O error in request sense"
246 " command\n", drive->name);
247 return ide_do_reset(drive);
248 }
249
Borislav Petkov8fccf892008-07-23 19:56:01 +0200250 debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200251
252 /* Retry operation */
253 retry_pc(drive);
Borislav Petkov8fccf892008-07-23 19:56:01 +0200254
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200255 /* queued, but not started */
256 return ide_stopped;
257 }
258cmd_finished:
259 pc->error = 0;
260 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200261 (stat & ATA_DSC) == 0) {
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200262 dsc_handle(drive);
263 return ide_stopped;
264 }
Borislav Petkov8fccf892008-07-23 19:56:01 +0200265
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200266 /* Command finished - Call the callback function */
Borislav Petkovdb9d2862008-07-23 19:55:59 +0200267 drive->pc_callback(drive);
Borislav Petkov8fccf892008-07-23 19:56:01 +0200268
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200269 return ide_stopped;
270 }
271
272 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
273 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
274 printk(KERN_ERR "%s: The device wants to issue more interrupts "
275 "in DMA mode\n", drive->name);
276 ide_dma_off(drive);
277 return ide_do_reset(drive);
278 }
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200279
Bartlomiej Zolnierkiewicz18236492008-07-23 19:55:54 +0200280 /* Get the number of bytes to transfer on this interrupt. */
281 ide_read_bcount_and_ireason(drive, &bcount, &ireason);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200282
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200283 if (ireason & ATAPI_COD) {
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200284 printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
285 return ide_do_reset(drive);
286 }
Borislav Petkov8fccf892008-07-23 19:56:01 +0200287
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200288 if (((ireason & ATAPI_IO) == ATAPI_IO) ==
289 !!(pc->flags & PC_FLAG_WRITING)) {
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200290 /* Hopefully, we will never get here */
291 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
292 "to %s!\n", drive->name,
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200293 (ireason & ATAPI_IO) ? "Write" : "Read",
294 (ireason & ATAPI_IO) ? "Read" : "Write");
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200295 return ide_do_reset(drive);
296 }
Borislav Petkov8fccf892008-07-23 19:56:01 +0200297
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200298 if (!(pc->flags & PC_FLAG_WRITING)) {
299 /* Reading - Check that we have enough space */
300 temp = pc->xferred + bcount;
301 if (temp > pc->req_xfer) {
302 if (temp > pc->buf_size) {
303 printk(KERN_ERR "%s: The device wants to send "
304 "us more data than expected - "
305 "discarding data\n",
306 drive->name);
307 if (scsi)
308 temp = pc->buf_size - pc->xferred;
309 else
310 temp = 0;
311 if (temp) {
312 if (pc->sg)
313 io_buffers(drive, pc, temp, 0);
314 else
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200315 tp_ops->input_data(drive, NULL,
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200316 pc->cur_pos, temp);
317 printk(KERN_ERR "%s: transferred %d of "
318 "%d bytes\n",
319 drive->name,
320 temp, bcount);
321 }
322 pc->xferred += temp;
323 pc->cur_pos += temp;
324 ide_pad_transfer(drive, 0, bcount - temp);
325 ide_set_handler(drive, handler, timeout,
326 expiry);
327 return ide_started;
328 }
329 debug_log("The device wants to send us more data than "
330 "expected - allowing transfer\n");
331 }
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200332 xferfunc = tp_ops->input_data;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200333 } else
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200334 xferfunc = tp_ops->output_data;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200335
336 if ((drive->media == ide_floppy && !scsi && !pc->buf) ||
337 (drive->media == ide_tape && !scsi && pc->bh) ||
Bartlomiej Zolnierkiewiczacaa0f52008-10-10 22:39:36 +0200338 (scsi && pc->sg)) {
339 int done = io_buffers(drive, pc, bcount,
340 !!(pc->flags & PC_FLAG_WRITING));
341
342 /* FIXME: don't do partial completions */
343 if (drive->media == ide_floppy && !scsi)
344 ide_end_request(drive, 1, done >> 9);
345 } else
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200346 xferfunc(drive, NULL, pc->cur_pos, bcount);
347
348 /* Update the current position */
349 pc->xferred += bcount;
350 pc->cur_pos += bcount;
351
352 debug_log("[cmd %x] transferred %d bytes on that intr.\n",
Borislav Petkov8fccf892008-07-23 19:56:01 +0200353 rq->cmd[0], bcount);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200354
355 /* And set the interrupt handler again */
356 ide_set_handler(drive, handler, timeout, expiry);
357 return ide_started;
358}
359EXPORT_SYMBOL_GPL(ide_pc_intr);
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200360
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200361static u8 ide_read_ireason(ide_drive_t *drive)
362{
363 ide_task_t task;
364
365 memset(&task, 0, sizeof(task));
366 task.tf_flags = IDE_TFLAG_IN_NSECT;
367
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200368 drive->hwif->tp_ops->tf_read(drive, &task);
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200369
370 return task.tf.nsect & 3;
371}
372
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200373static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
374{
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200375 int retries = 100;
376
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200377 while (retries-- && ((ireason & ATAPI_COD) == 0 ||
378 (ireason & ATAPI_IO))) {
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200379 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
380 "a packet command, retrying\n", drive->name);
381 udelay(100);
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200382 ireason = ide_read_ireason(drive);
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200383 if (retries == 0) {
384 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
385 "a packet command, ignoring\n",
386 drive->name);
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200387 ireason |= ATAPI_COD;
388 ireason &= ~ATAPI_IO;
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200389 }
390 }
391
392 return ireason;
393}
394
395ide_startstop_t ide_transfer_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
396 ide_handler_t *handler, unsigned int timeout,
397 ide_expiry_t *expiry)
398{
399 ide_hwif_t *hwif = drive->hwif;
Borislav Petkov8fccf892008-07-23 19:56:01 +0200400 struct request *rq = hwif->hwgroup->rq;
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200401 ide_startstop_t startstop;
402 u8 ireason;
403
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200404 if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200405 printk(KERN_ERR "%s: Strange, packet command initiated yet "
406 "DRQ isn't asserted\n", drive->name);
407 return startstop;
408 }
409
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200410 ireason = ide_read_ireason(drive);
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200411 if (drive->media == ide_tape && !drive->scsi)
412 ireason = ide_wait_ireason(drive, ireason);
413
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200414 if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) {
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200415 printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
416 "a packet command\n", drive->name);
417 return ide_do_reset(drive);
418 }
419
420 /* Set the interrupt routine */
421 ide_set_handler(drive, handler, timeout, expiry);
422
423 /* Begin DMA, if necessary */
424 if (pc->flags & PC_FLAG_DMA_OK) {
425 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
426 hwif->dma_ops->dma_start(drive);
427 }
428
429 /* Send the actual packet */
Borislav Petkovea68d272008-07-23 19:56:01 +0200430 if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
Borislav Petkov8fccf892008-07-23 19:56:01 +0200431 hwif->tp_ops->output_data(drive, NULL, rq->cmd, 12);
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200432
433 return ide_started;
434}
435EXPORT_SYMBOL_GPL(ide_transfer_pc);
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200436
437ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
438 ide_handler_t *handler, unsigned int timeout,
439 ide_expiry_t *expiry)
440{
441 ide_hwif_t *hwif = drive->hwif;
442 u16 bcount;
443 u8 dma = 0;
444
445 /* We haven't transferred any data yet */
446 pc->xferred = 0;
447 pc->cur_pos = pc->buf;
448
449 /* Request to transfer the entire buffer at once */
450 if (drive->media == ide_tape && !drive->scsi)
451 bcount = pc->req_xfer;
452 else
453 bcount = min(pc->req_xfer, 63 * 1024);
454
455 if (pc->flags & PC_FLAG_DMA_ERROR) {
456 pc->flags &= ~PC_FLAG_DMA_ERROR;
457 ide_dma_off(drive);
458 }
459
460 if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) {
461 if (drive->scsi)
462 hwif->sg_mapped = 1;
463 dma = !hwif->dma_ops->dma_setup(drive);
464 if (drive->scsi)
465 hwif->sg_mapped = 0;
466 }
467
468 if (!dma)
469 pc->flags &= ~PC_FLAG_DMA_OK;
470
471 ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE,
472 bcount, dma);
473
474 /* Issue the packet command */
Borislav Petkovac77ef82008-07-23 19:56:01 +0200475 if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200476 ide_execute_command(drive, ATA_CMD_PACKET, handler,
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200477 timeout, NULL);
478 return ide_started;
479 } else {
480 ide_execute_pkt_cmd(drive);
481 return (*handler)(drive);
482 }
483}
484EXPORT_SYMBOL_GPL(ide_issue_pc);