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Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +02001/*
2 * ATAPI support.
3 */
4
5#include <linux/kernel.h>
Borislav Petkov4cad0852009-01-02 16:12:53 +01006#include <linux/cdrom.h>
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +02007#include <linux/delay.h>
8#include <linux/ide.h>
Geert Uytterhoeven479edf02009-03-31 20:14:57 +02009#include <linux/scatterlist.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090010#include <linux/gfp.h>
Geert Uytterhoeven479edf02009-03-31 20:14:57 +020011
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +020012#include <scsi/scsi.h>
13
Borislav Petkov103f7032009-04-26 10:39:07 +020014#define DRV_NAME "ide-atapi"
15#define PFX DRV_NAME ": "
16
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +020017#ifdef DEBUG
18#define debug_log(fmt, args...) \
19 printk(KERN_INFO "ide: " fmt, ## args)
20#else
21#define debug_log(fmt, args...) do {} while (0)
22#endif
23
Borislav Petkov8c662852009-01-02 16:12:54 +010024#define ATAPI_MIN_CDB_BYTES 12
25
Borislav Petkov991cb262009-01-02 16:12:52 +010026static inline int dev_is_idecd(ide_drive_t *drive)
27{
Borislav Petkov53174642009-01-02 16:12:54 +010028 return drive->media == ide_cdrom || drive->media == ide_optical;
Borislav Petkov991cb262009-01-02 16:12:52 +010029}
30
Bartlomiej Zolnierkiewicz51509ee2008-10-10 22:39:34 +020031/*
32 * Check whether we can support a device,
33 * based on the ATAPI IDENTIFY command results.
34 */
35int ide_check_atapi_device(ide_drive_t *drive, const char *s)
36{
37 u16 *id = drive->id;
38 u8 gcw[2], protocol, device_type, removable, drq_type, packet_size;
39
40 *((u16 *)&gcw) = id[ATA_ID_CONFIG];
41
42 protocol = (gcw[1] & 0xC0) >> 6;
43 device_type = gcw[1] & 0x1F;
44 removable = (gcw[0] & 0x80) >> 7;
45 drq_type = (gcw[0] & 0x60) >> 5;
46 packet_size = gcw[0] & 0x03;
47
48#ifdef CONFIG_PPC
49 /* kludge for Apple PowerBook internal zip */
50 if (drive->media == ide_floppy && device_type == 5 &&
51 !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&
52 strstr((char *)&id[ATA_ID_PROD], "ZIP"))
53 device_type = 0;
54#endif
55
56 if (protocol != 2)
57 printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n",
58 s, drive->name, protocol);
59 else if ((drive->media == ide_floppy && device_type != 0) ||
60 (drive->media == ide_tape && device_type != 1))
61 printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n",
62 s, drive->name, device_type);
63 else if (removable == 0)
64 printk(KERN_ERR "%s: %s: the removable flag is not set\n",
65 s, drive->name);
66 else if (drive->media == ide_floppy && drq_type == 3)
67 printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not "
68 "supported\n", s, drive->name, drq_type);
69 else if (packet_size != 0)
70 printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 "
71 "bytes\n", s, drive->name, packet_size);
72 else
73 return 1;
74 return 0;
75}
76EXPORT_SYMBOL_GPL(ide_check_atapi_device);
77
Bartlomiej Zolnierkiewicz7bf74202008-10-10 22:39:37 +020078void ide_init_pc(struct ide_atapi_pc *pc)
79{
80 memset(pc, 0, sizeof(*pc));
Bartlomiej Zolnierkiewicz7bf74202008-10-10 22:39:37 +020081}
82EXPORT_SYMBOL_GPL(ide_init_pc);
83
Bartlomiej Zolnierkiewicz7645c152008-10-10 22:39:37 +020084/*
Bartlomiej Zolnierkiewicz2ac07d92008-10-10 22:39:38 +020085 * Add a special packet command request to the tail of the request queue,
86 * and wait for it to be serviced.
87 */
88int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
Borislav Petkovb13345f2009-05-02 10:26:12 +020089 struct ide_atapi_pc *pc, void *buf, unsigned int bufflen)
Bartlomiej Zolnierkiewicz2ac07d92008-10-10 22:39:38 +020090{
91 struct request *rq;
92 int error;
93
94 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
95 rq->cmd_type = REQ_TYPE_SPECIAL;
Tejun Heoc267cc12009-04-19 07:00:42 +090096 rq->special = (char *)pc;
Borislav Petkov3eb76c12009-03-13 21:16:12 +010097
Borislav Petkovb13345f2009-05-02 10:26:12 +020098 if (buf && bufflen) {
99 error = blk_rq_map_kern(drive->queue, rq, buf, bufflen,
Tejun Heo5c4be572009-04-19 07:00:42 +0900100 GFP_NOIO);
101 if (error)
102 goto put_req;
Borislav Petkov3eb76c12009-03-13 21:16:12 +0100103 }
104
Bartlomiej Zolnierkiewicz2ac07d92008-10-10 22:39:38 +0200105 memcpy(rq->cmd, pc->c, 12);
106 if (drive->media == ide_tape)
107 rq->cmd[13] = REQ_IDETAPE_PC1;
108 error = blk_execute_rq(drive->queue, disk, rq, 0);
Tejun Heo5c4be572009-04-19 07:00:42 +0900109put_req:
Bartlomiej Zolnierkiewicz2ac07d92008-10-10 22:39:38 +0200110 blk_put_request(rq);
Bartlomiej Zolnierkiewicz2ac07d92008-10-10 22:39:38 +0200111 return error;
112}
113EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
114
Bartlomiej Zolnierkiewiczde699ad2008-10-10 22:39:39 +0200115int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk)
116{
117 struct ide_atapi_pc pc;
118
119 ide_init_pc(&pc);
120 pc.c[0] = TEST_UNIT_READY;
121
Borislav Petkovb13345f2009-05-02 10:26:12 +0200122 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
Bartlomiej Zolnierkiewiczde699ad2008-10-10 22:39:39 +0200123}
124EXPORT_SYMBOL_GPL(ide_do_test_unit_ready);
125
Bartlomiej Zolnierkiewicz0c8a6c72008-10-10 22:39:39 +0200126int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start)
127{
128 struct ide_atapi_pc pc;
129
130 ide_init_pc(&pc);
131 pc.c[0] = START_STOP;
132 pc.c[4] = start;
133
134 if (drive->media == ide_tape)
135 pc.flags |= PC_FLAG_WAIT_FOR_DSC;
136
Borislav Petkovb13345f2009-05-02 10:26:12 +0200137 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
Bartlomiej Zolnierkiewicz0c8a6c72008-10-10 22:39:39 +0200138}
139EXPORT_SYMBOL_GPL(ide_do_start_stop);
140
Bartlomiej Zolnierkiewicz05780422008-10-10 22:39:38 +0200141int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on)
142{
143 struct ide_atapi_pc pc;
144
Bartlomiej Zolnierkiewicz42619d32008-10-17 18:09:11 +0200145 if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)
Bartlomiej Zolnierkiewicz05780422008-10-10 22:39:38 +0200146 return 0;
147
148 ide_init_pc(&pc);
149 pc.c[0] = ALLOW_MEDIUM_REMOVAL;
150 pc.c[4] = on;
151
Borislav Petkovb13345f2009-05-02 10:26:12 +0200152 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
Bartlomiej Zolnierkiewicz05780422008-10-10 22:39:38 +0200153}
154EXPORT_SYMBOL_GPL(ide_set_media_lock);
155
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +0200156void ide_create_request_sense_cmd(ide_drive_t *drive, struct ide_atapi_pc *pc)
157{
158 ide_init_pc(pc);
159 pc->c[0] = REQUEST_SENSE;
160 if (drive->media == ide_floppy) {
161 pc->c[4] = 255;
162 pc->req_xfer = 18;
163 } else {
164 pc->c[4] = 20;
165 pc->req_xfer = 20;
166 }
167}
168EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd);
169
Borislav Petkova1df5162009-04-19 07:00:42 +0900170void ide_prep_sense(ide_drive_t *drive, struct request *rq)
171{
172 struct request_sense *sense = &drive->sense_data;
173 struct request *sense_rq = &drive->sense_rq;
174 unsigned int cmd_len, sense_len;
Tejun Heo5c4be572009-04-19 07:00:42 +0900175 int err;
Borislav Petkova1df5162009-04-19 07:00:42 +0900176
Borislav Petkova1df5162009-04-19 07:00:42 +0900177 switch (drive->media) {
178 case ide_floppy:
179 cmd_len = 255;
180 sense_len = 18;
181 break;
182 case ide_tape:
183 cmd_len = 20;
184 sense_len = 20;
185 break;
186 default:
187 cmd_len = 18;
188 sense_len = 18;
189 }
190
191 BUG_ON(sense_len > sizeof(*sense));
192
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200193 if (rq->cmd_type == REQ_TYPE_SENSE || drive->sense_rq_armed)
Borislav Petkova1df5162009-04-19 07:00:42 +0900194 return;
195
196 memset(sense, 0, sizeof(*sense));
197
198 blk_rq_init(rq->q, sense_rq);
Borislav Petkova1df5162009-04-19 07:00:42 +0900199
Tejun Heo5c4be572009-04-19 07:00:42 +0900200 err = blk_rq_map_kern(drive->queue, sense_rq, sense, sense_len,
201 GFP_NOIO);
202 if (unlikely(err)) {
203 if (printk_ratelimit())
Borislav Petkov103f7032009-04-26 10:39:07 +0200204 printk(KERN_WARNING PFX "%s: failed to map sense "
205 "buffer\n", drive->name);
Tejun Heo5c4be572009-04-19 07:00:42 +0900206 return;
207 }
208
209 sense_rq->rq_disk = rq->rq_disk;
Borislav Petkova1df5162009-04-19 07:00:42 +0900210 sense_rq->cmd[0] = GPCMD_REQUEST_SENSE;
211 sense_rq->cmd[4] = cmd_len;
Borislav Petkova1df5162009-04-19 07:00:42 +0900212 sense_rq->cmd_type = REQ_TYPE_SENSE;
213 sense_rq->cmd_flags |= REQ_PREEMPT;
214
215 if (drive->media == ide_tape)
216 sense_rq->cmd[13] = REQ_IDETAPE_PC1;
217
218 drive->sense_rq_armed = true;
219}
220EXPORT_SYMBOL_GPL(ide_prep_sense);
221
Tejun Heo5c4be572009-04-19 07:00:42 +0900222int ide_queue_sense_rq(ide_drive_t *drive, void *special)
Borislav Petkova1df5162009-04-19 07:00:42 +0900223{
Tejun Heo5c4be572009-04-19 07:00:42 +0900224 /* deferred failure from ide_prep_sense() */
225 if (!drive->sense_rq_armed) {
Borislav Petkov103f7032009-04-26 10:39:07 +0200226 printk(KERN_WARNING PFX "%s: error queuing a sense request\n",
Tejun Heo5c4be572009-04-19 07:00:42 +0900227 drive->name);
228 return -ENOMEM;
229 }
Borislav Petkova1df5162009-04-19 07:00:42 +0900230
231 drive->sense_rq.special = special;
232 drive->sense_rq_armed = false;
233
234 drive->hwif->rq = NULL;
235
Jens Axboe7eaceac2011-03-10 08:52:07 +0100236 elv_add_request(drive->queue, &drive->sense_rq, ELEVATOR_INSERT_FRONT);
Tejun Heo5c4be572009-04-19 07:00:42 +0900237 return 0;
Borislav Petkova1df5162009-04-19 07:00:42 +0900238}
239EXPORT_SYMBOL_GPL(ide_queue_sense_rq);
240
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +0200241/*
242 * Called when an error was detected during the last packet command.
Borislav Petkov6b544fc2009-04-19 07:00:42 +0900243 * We queue a request sense packet command at the head of the request
244 * queue.
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +0200245 */
Borislav Petkov6b544fc2009-04-19 07:00:42 +0900246void ide_retry_pc(ide_drive_t *drive)
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +0200247{
Tejun Heo8f6205c2009-05-08 11:53:59 +0900248 struct request *failed_rq = drive->hwif->rq;
Borislav Petkov6b544fc2009-04-19 07:00:42 +0900249 struct request *sense_rq = &drive->sense_rq;
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +0200250 struct ide_atapi_pc *pc = &drive->request_sense_pc;
251
252 (void)ide_read_error(drive);
Borislav Petkov6b544fc2009-04-19 07:00:42 +0900253
254 /* init pc from sense_rq */
255 ide_init_pc(pc);
256 memcpy(pc->c, sense_rq->cmd, 12);
Borislav Petkov6b544fc2009-04-19 07:00:42 +0900257
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +0200258 if (drive->media == ide_tape)
Borislav Petkov626542c2009-06-07 15:37:05 +0200259 drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
Borislav Petkov6b544fc2009-04-19 07:00:42 +0900260
Tejun Heo8f6205c2009-05-08 11:53:59 +0900261 /*
262 * Push back the failed request and put request sense on top
263 * of it. The failed command will be retried after sense data
264 * is acquired.
265 */
Tejun Heo8f6205c2009-05-08 11:53:59 +0900266 drive->hwif->rq = NULL;
Herbert Xu1af18502010-03-31 20:13:39 +0000267 ide_requeue_and_plug(drive, failed_rq);
Tejun Heo8f6205c2009-05-08 11:53:59 +0900268 if (ide_queue_sense_rq(drive, pc)) {
Tejun Heo9934c8c2009-05-08 11:54:16 +0900269 blk_start_request(failed_rq);
Tejun Heo8f6205c2009-05-08 11:53:59 +0900270 ide_complete_rq(drive, -EIO, blk_rq_bytes(failed_rq));
271 }
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +0200272}
273EXPORT_SYMBOL_GPL(ide_retry_pc);
274
Borislav Petkov4cad0852009-01-02 16:12:53 +0100275int ide_cd_expiry(ide_drive_t *drive)
276{
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100277 struct request *rq = drive->hwif->rq;
Borislav Petkov4cad0852009-01-02 16:12:53 +0100278 unsigned long wait = 0;
279
280 debug_log("%s: rq->cmd[0]: 0x%x\n", __func__, rq->cmd[0]);
281
282 /*
283 * Some commands are *slow* and normally take a long time to complete.
284 * Usually we can use the ATAPI "disconnect" to bypass this, but not all
285 * commands/drives support that. Let ide_timer_expiry keep polling us
286 * for these.
287 */
288 switch (rq->cmd[0]) {
289 case GPCMD_BLANK:
290 case GPCMD_FORMAT_UNIT:
291 case GPCMD_RESERVE_RZONE_TRACK:
292 case GPCMD_CLOSE_TRACK:
293 case GPCMD_FLUSH_CACHE:
294 wait = ATAPI_WAIT_PC;
295 break;
296 default:
297 if (!(rq->cmd_flags & REQ_QUIET))
Borislav Petkov103f7032009-04-26 10:39:07 +0200298 printk(KERN_INFO PFX "cmd 0x%x timed out\n",
Borislav Petkov4cad0852009-01-02 16:12:53 +0100299 rq->cmd[0]);
300 wait = 0;
301 break;
302 }
303 return wait;
304}
305EXPORT_SYMBOL_GPL(ide_cd_expiry);
306
Borislav Petkov392de1d2009-01-02 16:12:52 +0100307int ide_cd_get_xferlen(struct request *rq)
308{
Christoph Hellwig4c4762d2010-06-19 17:26:47 +0200309 switch (rq->cmd_type) {
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200310 case REQ_TYPE_FS:
Borislav Petkov392de1d2009-01-02 16:12:52 +0100311 return 32768;
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200312 case REQ_TYPE_SENSE:
313 case REQ_TYPE_BLOCK_PC:
314 case REQ_TYPE_ATA_PC:
Tejun Heo34b7d2c2009-05-07 22:24:43 +0900315 return blk_rq_bytes(rq);
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200316 default:
Borislav Petkov392de1d2009-01-02 16:12:52 +0100317 return 0;
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200318 }
Borislav Petkov392de1d2009-01-02 16:12:52 +0100319}
320EXPORT_SYMBOL_GPL(ide_cd_get_xferlen);
321
Bartlomiej Zolnierkiewicz0d6a9752009-03-24 23:22:46 +0100322void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason)
323{
Sergei Shtylyov3153c262009-04-08 14:13:03 +0200324 struct ide_taskfile tf;
Bartlomiej Zolnierkiewicz0d6a9752009-03-24 23:22:46 +0100325
Sergei Shtylyov3153c262009-04-08 14:13:03 +0200326 drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT |
327 IDE_VALID_LBAM | IDE_VALID_LBAH);
Bartlomiej Zolnierkiewicz0d6a9752009-03-24 23:22:46 +0100328
Sergei Shtylyov3153c262009-04-08 14:13:03 +0200329 *bcount = (tf.lbah << 8) | tf.lbam;
330 *ireason = tf.nsect & 3;
Bartlomiej Zolnierkiewicz0d6a9752009-03-24 23:22:46 +0100331}
332EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason);
333
Bartlomiej Zolnierkiewiczaa5d2de2008-10-13 21:39:32 +0200334/*
Borislav Petkov103f7032009-04-26 10:39:07 +0200335 * Check the contents of the interrupt reason register and attempt to recover if
336 * there are problems.
337 *
338 * Returns:
339 * - 0 if everything's ok
340 * - 1 if the request has to be terminated.
341 */
342int ide_check_ireason(ide_drive_t *drive, struct request *rq, int len,
343 int ireason, int rw)
344{
345 ide_hwif_t *hwif = drive->hwif;
346
347 debug_log("ireason: 0x%x, rw: 0x%x\n", ireason, rw);
348
349 if (ireason == (!rw << 1))
350 return 0;
351 else if (ireason == (rw << 1)) {
352 printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n",
353 drive->name, __func__);
354
355 if (dev_is_idecd(drive))
356 ide_pad_transfer(drive, rw, len);
357 } else if (!rw && ireason == ATAPI_COD) {
358 if (dev_is_idecd(drive)) {
359 /*
360 * Some drives (ASUS) seem to tell us that status info
361 * is available. Just get it and ignore.
362 */
363 (void)hwif->tp_ops->read_status(hwif);
364 return 0;
365 }
366 } else {
367 if (ireason & ATAPI_COD)
368 printk(KERN_ERR PFX "%s: CoD != 0 in %s\n", drive->name,
369 __func__);
370
371 /* drive wants a command packet, or invalid ireason... */
372 printk(KERN_ERR PFX "%s: %s: bad interrupt reason 0x%02x\n",
373 drive->name, __func__, ireason);
374 }
375
376 if (dev_is_idecd(drive) && rq->cmd_type == REQ_TYPE_ATA_PC)
377 rq->cmd_flags |= REQ_FAILED;
378
379 return 1;
380}
381EXPORT_SYMBOL_GPL(ide_check_ireason);
382
383/*
Bartlomiej Zolnierkiewiczaa5d2de2008-10-13 21:39:32 +0200384 * This is the usual interrupt handler which will be called during a packet
385 * command. We will transfer some of the data (as requested by the drive)
386 * and will re-point interrupt handler to us.
387 */
388static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200389{
Bartlomiej Zolnierkiewicz2b9efba2008-10-13 21:39:31 +0200390 struct ide_atapi_pc *pc = drive->pc;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200391 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewiczf094d4d2009-03-31 20:15:24 +0200392 struct ide_cmd *cmd = &hwif->cmd;
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100393 struct request *rq = hwif->rq;
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200394 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
Bartlomiej Zolnierkiewiczd93bc452009-03-31 20:15:26 +0200395 unsigned int timeout, done;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200396 u16 bcount;
Borislav Petkov5d655a02009-01-02 16:12:54 +0100397 u8 stat, ireason, dsc = 0;
Bartlomiej Zolnierkiewiczd93bc452009-03-31 20:15:26 +0200398 u8 write = !!(pc->flags & PC_FLAG_WRITING);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200399
400 debug_log("Enter %s - interrupt handler\n", __func__);
401
Borislav Petkov5d655a02009-01-02 16:12:54 +0100402 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
403 : WAIT_TAPE_CMD;
Bartlomiej Zolnierkiewicz844b9462008-10-13 21:39:31 +0200404
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200405 /* Clear the interrupt */
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200406 stat = tp_ops->read_status(hwif);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200407
408 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
Bartlomiej Zolnierkiewicz88b41322009-03-31 20:15:22 +0200409 int rc;
Bartlomiej Zolnierkiewicz44530112009-03-31 20:15:20 +0200410
Bartlomiej Zolnierkiewicz88b41322009-03-31 20:15:22 +0200411 drive->waiting_for_dma = 0;
412 rc = hwif->dma_ops->dma_end(drive);
Bartlomiej Zolnierkiewiczf094d4d2009-03-31 20:15:24 +0200413 ide_dma_unmap_sg(drive, cmd);
Bartlomiej Zolnierkiewicz44530112009-03-31 20:15:20 +0200414
415 if (rc || (drive->media == ide_tape && (stat & ATA_ERR))) {
Borislav Petkov5d655a02009-01-02 16:12:54 +0100416 if (drive->media == ide_floppy)
Borislav Petkov103f7032009-04-26 10:39:07 +0200417 printk(KERN_ERR PFX "%s: DMA %s error\n",
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200418 drive->name, rq_data_dir(pc->rq)
419 ? "write" : "read");
420 pc->flags |= PC_FLAG_DMA_ERROR;
Tejun Heo6d700382009-04-19 08:46:03 +0900421 } else
Borislav Petkov077e6db2009-05-01 21:21:02 +0200422 rq->resid_len = 0;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200423 debug_log("%s: DMA finished\n", drive->name);
424 }
425
426 /* No more interrupts */
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200427 if ((stat & ATA_DRQ) == 0) {
Borislav Petkov5b6c9422009-03-31 20:15:34 +0200428 int uptodate, error;
Bartlomiej Zolnierkiewicz03a2faa2009-03-27 12:46:36 +0100429
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200430 debug_log("Packet command completed, %d bytes transferred\n",
Borislav Petkov077e6db2009-05-01 21:21:02 +0200431 blk_rq_bytes(rq));
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200432
433 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
434
435 local_irq_enable_in_hardirq();
436
Borislav Petkov5d655a02009-01-02 16:12:54 +0100437 if (drive->media == ide_tape &&
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200438 (stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
439 stat &= ~ATA_ERR;
Borislav Petkov8fccf892008-07-23 19:56:01 +0200440
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200441 if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) {
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200442 /* Error detected */
443 debug_log("%s: I/O error\n", drive->name);
444
Borislav Petkov5d655a02009-01-02 16:12:54 +0100445 if (drive->media != ide_tape)
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200446 pc->rq->errors++;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200447
Borislav Petkov8fccf892008-07-23 19:56:01 +0200448 if (rq->cmd[0] == REQUEST_SENSE) {
Borislav Petkov103f7032009-04-26 10:39:07 +0200449 printk(KERN_ERR PFX "%s: I/O error in request "
450 "sense command\n", drive->name);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200451 return ide_do_reset(drive);
452 }
453
Borislav Petkov8fccf892008-07-23 19:56:01 +0200454 debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200455
456 /* Retry operation */
Borislav Petkov6b544fc2009-04-19 07:00:42 +0900457 ide_retry_pc(drive);
Borislav Petkov8fccf892008-07-23 19:56:01 +0200458
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200459 /* queued, but not started */
460 return ide_stopped;
461 }
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200462 pc->error = 0;
Bartlomiej Zolnierkiewiczb14c7212008-10-13 21:39:30 +0200463
464 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
465 dsc = 1;
Borislav Petkov8fccf892008-07-23 19:56:01 +0200466
Tejun Heob3071d12009-04-19 08:46:02 +0900467 /*
468 * ->pc_callback() might change rq->data_len for
469 * residual count, cache total length.
470 */
Tejun Heo21d9c5d2009-04-19 08:46:02 +0900471 done = blk_rq_bytes(rq);
Tejun Heob3071d12009-04-19 08:46:02 +0900472
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200473 /* Command finished - Call the callback function */
Bartlomiej Zolnierkiewicz03a2faa2009-03-27 12:46:36 +0100474 uptodate = drive->pc_callback(drive, dsc);
475
476 if (uptodate == 0)
477 drive->failed_pc = NULL;
478
Christoph Hellwig4c4762d2010-06-19 17:26:47 +0200479 if (rq->cmd_type == REQ_TYPE_SPECIAL) {
Bartlomiej Zolnierkiewicz6902a532009-03-27 12:46:43 +0100480 rq->errors = 0;
Borislav Petkov5b6c9422009-03-31 20:15:34 +0200481 error = 0;
Bartlomiej Zolnierkiewicz89f78b32009-03-27 12:46:43 +0100482 } else {
Bartlomiej Zolnierkiewicz349d12a2009-03-31 20:15:26 +0200483
Christoph Hellwig4c4762d2010-06-19 17:26:47 +0200484 if (rq->cmd_type != REQ_TYPE_FS && uptodate <= 0) {
Bartlomiej Zolnierkiewicz89f78b32009-03-27 12:46:43 +0100485 if (rq->errors == 0)
486 rq->errors = -EIO;
487 }
Bartlomiej Zolnierkiewicz349d12a2009-03-31 20:15:26 +0200488
Borislav Petkov5b6c9422009-03-31 20:15:34 +0200489 error = uptodate ? 0 : -EIO;
Bartlomiej Zolnierkiewicz89f78b32009-03-27 12:46:43 +0100490 }
Borislav Petkov8fccf892008-07-23 19:56:01 +0200491
Tejun Heoc3a4d782009-05-07 22:24:37 +0900492 ide_complete_rq(drive, error, blk_rq_bytes(rq));
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200493 return ide_stopped;
494 }
495
496 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
497 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
Borislav Petkov103f7032009-04-26 10:39:07 +0200498 printk(KERN_ERR PFX "%s: The device wants to issue more "
499 "interrupts in DMA mode\n", drive->name);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200500 ide_dma_off(drive);
501 return ide_do_reset(drive);
502 }
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200503
Bartlomiej Zolnierkiewicz18236492008-07-23 19:55:54 +0200504 /* Get the number of bytes to transfer on this interrupt. */
505 ide_read_bcount_and_ireason(drive, &bcount, &ireason);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200506
Borislav Petkov103f7032009-04-26 10:39:07 +0200507 if (ide_check_ireason(drive, rq, bcount, ireason, write))
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200508 return ide_do_reset(drive);
Borislav Petkov8fccf892008-07-23 19:56:01 +0200509
Tejun Heo6d700382009-04-19 08:46:03 +0900510 done = min_t(unsigned int, bcount, cmd->nleft);
511 ide_pio_bytes(drive, cmd, write, done);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200512
Tejun Heo6d700382009-04-19 08:46:03 +0900513 /* Update transferred byte count */
Borislav Petkov077e6db2009-05-01 21:21:02 +0200514 rq->resid_len -= done;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200515
Bartlomiej Zolnierkiewiczd93bc452009-03-31 20:15:26 +0200516 bcount -= done;
517
518 if (bcount)
519 ide_pad_transfer(drive, write, bcount);
520
Borislav Petkov077e6db2009-05-01 21:21:02 +0200521 debug_log("[cmd %x] transferred %d bytes, padded %d bytes, resid: %u\n",
522 rq->cmd[0], done, bcount, rq->resid_len);
Bartlomiej Zolnierkiewiczd93bc452009-03-31 20:15:26 +0200523
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200524 /* And set the interrupt handler again */
Bartlomiej Zolnierkiewicz60c0cd02009-03-27 12:46:46 +0100525 ide_set_handler(drive, ide_pc_intr, timeout);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200526 return ide_started;
527}
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200528
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200529static void ide_init_packet_cmd(struct ide_cmd *cmd, u8 valid_tf,
Bartlomiej Zolnierkiewiczb788ee92009-03-27 12:46:46 +0100530 u16 bcount, u8 dma)
Bartlomiej Zolnierkiewicz7a254df2009-03-24 23:22:39 +0100531{
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200532 cmd->protocol = dma ? ATAPI_PROT_DMA : ATAPI_PROT_PIO;
533 cmd->valid.out.tf = IDE_VALID_LBAH | IDE_VALID_LBAM |
534 IDE_VALID_FEATURE | valid_tf;
Bartlomiej Zolnierkiewicz35b5d0b2009-03-27 12:46:47 +0100535 cmd->tf.command = ATA_CMD_PACKET;
Bartlomiej Zolnierkiewiczb788ee92009-03-27 12:46:46 +0100536 cmd->tf.feature = dma; /* Use PIO/DMA */
537 cmd->tf.lbam = bcount & 0xff;
538 cmd->tf.lbah = (bcount >> 8) & 0xff;
Bartlomiej Zolnierkiewicz7a254df2009-03-24 23:22:39 +0100539}
540
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200541static u8 ide_read_ireason(ide_drive_t *drive)
542{
Sergei Shtylyov3153c262009-04-08 14:13:03 +0200543 struct ide_taskfile tf;
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200544
Sergei Shtylyov3153c262009-04-08 14:13:03 +0200545 drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT);
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200546
Sergei Shtylyov3153c262009-04-08 14:13:03 +0200547 return tf.nsect & 3;
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200548}
549
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200550static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
551{
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200552 int retries = 100;
553
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200554 while (retries-- && ((ireason & ATAPI_COD) == 0 ||
555 (ireason & ATAPI_IO))) {
Borislav Petkov103f7032009-04-26 10:39:07 +0200556 printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing "
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200557 "a packet command, retrying\n", drive->name);
558 udelay(100);
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200559 ireason = ide_read_ireason(drive);
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200560 if (retries == 0) {
Borislav Petkov103f7032009-04-26 10:39:07 +0200561 printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing"
562 " a packet command, ignoring\n",
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200563 drive->name);
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200564 ireason |= ATAPI_COD;
565 ireason &= ~ATAPI_IO;
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200566 }
567 }
568
569 return ireason;
570}
571
Bartlomiej Zolnierkiewiczbaf08f02008-10-13 21:39:32 +0200572static int ide_delayed_transfer_pc(ide_drive_t *drive)
573{
574 /* Send the actual packet */
575 drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12);
576
577 /* Timeout for the packet command */
578 return WAIT_FLOPPY_CMD;
579}
580
581static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200582{
Borislav Petkovb16aabc2009-01-02 16:12:56 +0100583 struct ide_atapi_pc *uninitialized_var(pc);
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200584 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100585 struct request *rq = hwif->rq;
Bartlomiej Zolnierkiewiczbaf08f02008-10-13 21:39:32 +0200586 ide_expiry_t *expiry;
587 unsigned int timeout;
Borislav Petkov8c662852009-01-02 16:12:54 +0100588 int cmd_len;
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200589 ide_startstop_t startstop;
590 u8 ireason;
591
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200592 if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
Borislav Petkov103f7032009-04-26 10:39:07 +0200593 printk(KERN_ERR PFX "%s: Strange, packet command initiated yet "
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200594 "DRQ isn't asserted\n", drive->name);
595 return startstop;
596 }
597
Borislav Petkov5f258432009-01-02 16:12:53 +0100598 if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
599 if (drive->dma)
600 drive->waiting_for_dma = 1;
601 }
602
Borislav Petkov8c662852009-01-02 16:12:54 +0100603 if (dev_is_idecd(drive)) {
604 /* ATAPI commands get padded out to 12 bytes minimum */
605 cmd_len = COMMAND_SIZE(rq->cmd[0]);
606 if (cmd_len < ATAPI_MIN_CDB_BYTES)
607 cmd_len = ATAPI_MIN_CDB_BYTES;
Borislav Petkovdef860d2009-01-02 16:12:55 +0100608
609 timeout = rq->timeout;
610 expiry = ide_cd_expiry;
611 } else {
Borislav Petkovb16aabc2009-01-02 16:12:56 +0100612 pc = drive->pc;
613
Borislav Petkov8c662852009-01-02 16:12:54 +0100614 cmd_len = ATAPI_MIN_CDB_BYTES;
615
Borislav Petkovdef860d2009-01-02 16:12:55 +0100616 /*
617 * If necessary schedule the packet transfer to occur 'timeout'
Martin Olsson19af5cd2009-04-23 11:37:37 +0200618 * milliseconds later in ide_delayed_transfer_pc() after the
Borislav Petkovdef860d2009-01-02 16:12:55 +0100619 * device says it's ready for a packet.
620 */
621 if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
622 timeout = drive->pc_delay;
623 expiry = &ide_delayed_transfer_pc;
624 } else {
625 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
626 : WAIT_TAPE_CMD;
627 expiry = NULL;
628 }
Borislav Petkov06cc2772009-01-02 16:12:56 +0100629
630 ireason = ide_read_ireason(drive);
631 if (drive->media == ide_tape)
632 ireason = ide_wait_ireason(drive, ireason);
633
634 if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) {
Borislav Petkov103f7032009-04-26 10:39:07 +0200635 printk(KERN_ERR PFX "%s: (IO,CoD) != (0,1) while "
636 "issuing a packet command\n", drive->name);
Borislav Petkov06cc2772009-01-02 16:12:56 +0100637
638 return ide_do_reset(drive);
639 }
Bartlomiej Zolnierkiewiczbaf08f02008-10-13 21:39:32 +0200640 }
641
Bartlomiej Zolnierkiewicz60c0cd02009-03-27 12:46:46 +0100642 hwif->expiry = expiry;
643
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200644 /* Set the interrupt routine */
Borislav Petkovd6251d42009-01-06 17:20:58 +0100645 ide_set_handler(drive,
646 (dev_is_idecd(drive) ? drive->irq_handler
647 : ide_pc_intr),
Bartlomiej Zolnierkiewicz60c0cd02009-03-27 12:46:46 +0100648 timeout);
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200649
Borislav Petkov2eba0822009-03-31 20:14:58 +0200650 /* Send the actual packet */
651 if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
652 hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
653
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200654 /* Begin DMA, if necessary */
Borislav Petkovb16aabc2009-01-02 16:12:56 +0100655 if (dev_is_idecd(drive)) {
656 if (drive->dma)
657 hwif->dma_ops->dma_start(drive);
658 } else {
659 if (pc->flags & PC_FLAG_DMA_OK) {
660 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
661 hwif->dma_ops->dma_start(drive);
662 }
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200663 }
664
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200665 return ide_started;
666}
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200667
Bartlomiej Zolnierkiewiczb788ee92009-03-27 12:46:46 +0100668ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200669{
Borislav Petkovd77612a2009-01-02 16:12:55 +0100670 struct ide_atapi_pc *pc;
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200671 ide_hwif_t *hwif = drive->hwif;
Borislav Petkov4cad0852009-01-02 16:12:53 +0100672 ide_expiry_t *expiry = NULL;
Bartlomiej Zolnierkiewicze6830a82009-03-27 12:46:37 +0100673 struct request *rq = hwif->rq;
Borislav Petkovdfb7e622009-05-01 20:35:21 +0200674 unsigned int timeout, bytes;
Borislav Petkov392de1d2009-01-02 16:12:52 +0100675 u16 bcount;
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200676 u8 valid_tf;
Bartlomiej Zolnierkiewicz35b5d0b2009-03-27 12:46:47 +0100677 u8 drq_int = !!(drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT);
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200678
Borislav Petkoved485542009-01-02 16:12:52 +0100679 if (dev_is_idecd(drive)) {
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200680 valid_tf = IDE_VALID_NSECT | IDE_VALID_LBAL;
Bartlomiej Zolnierkiewicze6830a82009-03-27 12:46:37 +0100681 bcount = ide_cd_get_xferlen(rq);
Borislav Petkov4cad0852009-01-02 16:12:53 +0100682 expiry = ide_cd_expiry;
Borislav Petkov28ad91d2009-01-02 16:12:56 +0100683 timeout = ATAPI_WAIT_PC;
Borislav Petkovd77612a2009-01-02 16:12:55 +0100684
Bartlomiej Zolnierkiewicz5ae54122009-03-31 20:15:20 +0200685 if (drive->dma)
686 drive->dma = !ide_dma_prepare(drive, cmd);
Borislav Petkoved485542009-01-02 16:12:52 +0100687 } else {
Borislav Petkovd77612a2009-01-02 16:12:55 +0100688 pc = drive->pc;
689
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200690 valid_tf = IDE_VALID_DEVICE;
Borislav Petkovdfb7e622009-05-01 20:35:21 +0200691 bytes = blk_rq_bytes(rq);
Borislav Petkovdfb7e622009-05-01 20:35:21 +0200692 bcount = ((drive->media == ide_tape) ? bytes
693 : min_t(unsigned int,
694 bytes, 63 * 1024));
Borislav Petkovd77612a2009-01-02 16:12:55 +0100695
Borislav Petkov077e6db2009-05-01 21:21:02 +0200696 /* We haven't transferred any data yet */
697 rq->resid_len = bcount;
Borislav Petkovd77612a2009-01-02 16:12:55 +0100698
699 if (pc->flags & PC_FLAG_DMA_ERROR) {
700 pc->flags &= ~PC_FLAG_DMA_ERROR;
701 ide_dma_off(drive);
702 }
703
Bartlomiej Zolnierkiewicz5ae54122009-03-31 20:15:20 +0200704 if (pc->flags & PC_FLAG_DMA_OK)
705 drive->dma = !ide_dma_prepare(drive, cmd);
Borislav Petkovd77612a2009-01-02 16:12:55 +0100706
707 if (!drive->dma)
708 pc->flags &= ~PC_FLAG_DMA_OK;
Borislav Petkov28ad91d2009-01-02 16:12:56 +0100709
710 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
711 : WAIT_TAPE_CMD;
Borislav Petkoved485542009-01-02 16:12:52 +0100712 }
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200713
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200714 ide_init_packet_cmd(cmd, valid_tf, bcount, drive->dma);
Bartlomiej Zolnierkiewiczb788ee92009-03-27 12:46:46 +0100715
716 (void)do_rw_taskfile(drive, cmd);
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200717
Bartlomiej Zolnierkiewicz35b5d0b2009-03-27 12:46:47 +0100718 if (drq_int) {
Borislav Petkov5f258432009-01-02 16:12:53 +0100719 if (drive->dma)
720 drive->waiting_for_dma = 0;
Bartlomiej Zolnierkiewicz22117d62009-03-27 12:46:47 +0100721 hwif->expiry = expiry;
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200722 }
Bartlomiej Zolnierkiewicz35b5d0b2009-03-27 12:46:47 +0100723
724 ide_execute_command(drive, cmd, ide_transfer_pc, timeout);
725
726 return drq_int ? ide_started : ide_transfer_pc(drive);
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200727}
728EXPORT_SYMBOL_GPL(ide_issue_pc);