blob: 05352f490d6088d736016e588c8a79313df30e21 [file] [log] [blame]
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>
Paul Gortmaker38789fd2011-07-17 15:33:58 -04008#include <linux/export.h>
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +02009#include <linux/ide.h>
Geert Uytterhoeven479edf02009-03-31 20:14:57 +020010#include <linux/scatterlist.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090011#include <linux/gfp.h>
Geert Uytterhoeven479edf02009-03-31 20:14:57 +020012
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +020013#include <scsi/scsi.h>
14
Borislav Petkov103f7032009-04-26 10:39:07 +020015#define DRV_NAME "ide-atapi"
16#define PFX DRV_NAME ": "
17
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +020018#ifdef DEBUG
19#define debug_log(fmt, args...) \
20 printk(KERN_INFO "ide: " fmt, ## args)
21#else
22#define debug_log(fmt, args...) do {} while (0)
23#endif
24
Borislav Petkov8c662852009-01-02 16:12:54 +010025#define ATAPI_MIN_CDB_BYTES 12
26
Borislav Petkov991cb262009-01-02 16:12:52 +010027static inline int dev_is_idecd(ide_drive_t *drive)
28{
Borislav Petkov53174642009-01-02 16:12:54 +010029 return drive->media == ide_cdrom || drive->media == ide_optical;
Borislav Petkov991cb262009-01-02 16:12:52 +010030}
31
Bartlomiej Zolnierkiewicz51509ee2008-10-10 22:39:34 +020032/*
33 * Check whether we can support a device,
34 * based on the ATAPI IDENTIFY command results.
35 */
36int ide_check_atapi_device(ide_drive_t *drive, const char *s)
37{
38 u16 *id = drive->id;
39 u8 gcw[2], protocol, device_type, removable, drq_type, packet_size;
40
41 *((u16 *)&gcw) = id[ATA_ID_CONFIG];
42
43 protocol = (gcw[1] & 0xC0) >> 6;
44 device_type = gcw[1] & 0x1F;
45 removable = (gcw[0] & 0x80) >> 7;
46 drq_type = (gcw[0] & 0x60) >> 5;
47 packet_size = gcw[0] & 0x03;
48
49#ifdef CONFIG_PPC
50 /* kludge for Apple PowerBook internal zip */
51 if (drive->media == ide_floppy && device_type == 5 &&
52 !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&
53 strstr((char *)&id[ATA_ID_PROD], "ZIP"))
54 device_type = 0;
55#endif
56
57 if (protocol != 2)
58 printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n",
59 s, drive->name, protocol);
60 else if ((drive->media == ide_floppy && device_type != 0) ||
61 (drive->media == ide_tape && device_type != 1))
62 printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n",
63 s, drive->name, device_type);
64 else if (removable == 0)
65 printk(KERN_ERR "%s: %s: the removable flag is not set\n",
66 s, drive->name);
67 else if (drive->media == ide_floppy && drq_type == 3)
68 printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not "
69 "supported\n", s, drive->name, drq_type);
70 else if (packet_size != 0)
71 printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 "
72 "bytes\n", s, drive->name, packet_size);
73 else
74 return 1;
75 return 0;
76}
77EXPORT_SYMBOL_GPL(ide_check_atapi_device);
78
Bartlomiej Zolnierkiewicz7bf74202008-10-10 22:39:37 +020079void ide_init_pc(struct ide_atapi_pc *pc)
80{
81 memset(pc, 0, sizeof(*pc));
Bartlomiej Zolnierkiewicz7bf74202008-10-10 22:39:37 +020082}
83EXPORT_SYMBOL_GPL(ide_init_pc);
84
Bartlomiej Zolnierkiewicz7645c152008-10-10 22:39:37 +020085/*
Bartlomiej Zolnierkiewicz2ac07d92008-10-10 22:39:38 +020086 * Add a special packet command request to the tail of the request queue,
87 * and wait for it to be serviced.
88 */
89int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
Borislav Petkovb13345f2009-05-02 10:26:12 +020090 struct ide_atapi_pc *pc, void *buf, unsigned int bufflen)
Bartlomiej Zolnierkiewicz2ac07d92008-10-10 22:39:38 +020091{
92 struct request *rq;
93 int error;
94
Mel Gorman71baba42015-11-06 16:28:28 -080095 rq = blk_get_request(drive->queue, READ, __GFP_RECLAIM);
Christoph Hellwig4f8c9512015-04-17 22:37:16 +020096 rq->cmd_type = REQ_TYPE_DRV_PRIV;
Tejun Heoc267cc12009-04-19 07:00:42 +090097 rq->special = (char *)pc;
Borislav Petkov3eb76c12009-03-13 21:16:12 +010098
Borislav Petkovb13345f2009-05-02 10:26:12 +020099 if (buf && bufflen) {
100 error = blk_rq_map_kern(drive->queue, rq, buf, bufflen,
Tejun Heo5c4be572009-04-19 07:00:42 +0900101 GFP_NOIO);
102 if (error)
103 goto put_req;
Borislav Petkov3eb76c12009-03-13 21:16:12 +0100104 }
105
Bartlomiej Zolnierkiewicz2ac07d92008-10-10 22:39:38 +0200106 memcpy(rq->cmd, pc->c, 12);
107 if (drive->media == ide_tape)
108 rq->cmd[13] = REQ_IDETAPE_PC1;
109 error = blk_execute_rq(drive->queue, disk, rq, 0);
Tejun Heo5c4be572009-04-19 07:00:42 +0900110put_req:
Bartlomiej Zolnierkiewicz2ac07d92008-10-10 22:39:38 +0200111 blk_put_request(rq);
Bartlomiej Zolnierkiewicz2ac07d92008-10-10 22:39:38 +0200112 return error;
113}
114EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
115
Bartlomiej Zolnierkiewiczde699ad2008-10-10 22:39:39 +0200116int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk)
117{
118 struct ide_atapi_pc pc;
119
120 ide_init_pc(&pc);
121 pc.c[0] = TEST_UNIT_READY;
122
Borislav Petkovb13345f2009-05-02 10:26:12 +0200123 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
Bartlomiej Zolnierkiewiczde699ad2008-10-10 22:39:39 +0200124}
125EXPORT_SYMBOL_GPL(ide_do_test_unit_ready);
126
Bartlomiej Zolnierkiewicz0c8a6c72008-10-10 22:39:39 +0200127int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start)
128{
129 struct ide_atapi_pc pc;
130
131 ide_init_pc(&pc);
132 pc.c[0] = START_STOP;
133 pc.c[4] = start;
134
135 if (drive->media == ide_tape)
136 pc.flags |= PC_FLAG_WAIT_FOR_DSC;
137
Borislav Petkovb13345f2009-05-02 10:26:12 +0200138 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
Bartlomiej Zolnierkiewicz0c8a6c72008-10-10 22:39:39 +0200139}
140EXPORT_SYMBOL_GPL(ide_do_start_stop);
141
Bartlomiej Zolnierkiewicz05780422008-10-10 22:39:38 +0200142int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on)
143{
144 struct ide_atapi_pc pc;
145
Bartlomiej Zolnierkiewicz42619d32008-10-17 18:09:11 +0200146 if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)
Bartlomiej Zolnierkiewicz05780422008-10-10 22:39:38 +0200147 return 0;
148
149 ide_init_pc(&pc);
150 pc.c[0] = ALLOW_MEDIUM_REMOVAL;
151 pc.c[4] = on;
152
Borislav Petkovb13345f2009-05-02 10:26:12 +0200153 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
Bartlomiej Zolnierkiewicz05780422008-10-10 22:39:38 +0200154}
155EXPORT_SYMBOL_GPL(ide_set_media_lock);
156
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +0200157void ide_create_request_sense_cmd(ide_drive_t *drive, struct ide_atapi_pc *pc)
158{
159 ide_init_pc(pc);
160 pc->c[0] = REQUEST_SENSE;
161 if (drive->media == ide_floppy) {
162 pc->c[4] = 255;
163 pc->req_xfer = 18;
164 } else {
165 pc->c[4] = 20;
166 pc->req_xfer = 20;
167 }
168}
169EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd);
170
Borislav Petkova1df5162009-04-19 07:00:42 +0900171void ide_prep_sense(ide_drive_t *drive, struct request *rq)
172{
173 struct request_sense *sense = &drive->sense_data;
174 struct request *sense_rq = &drive->sense_rq;
175 unsigned int cmd_len, sense_len;
Tejun Heo5c4be572009-04-19 07:00:42 +0900176 int err;
Borislav Petkova1df5162009-04-19 07:00:42 +0900177
Borislav Petkova1df5162009-04-19 07:00:42 +0900178 switch (drive->media) {
179 case ide_floppy:
180 cmd_len = 255;
181 sense_len = 18;
182 break;
183 case ide_tape:
184 cmd_len = 20;
185 sense_len = 20;
186 break;
187 default:
188 cmd_len = 18;
189 sense_len = 18;
190 }
191
192 BUG_ON(sense_len > sizeof(*sense));
193
Christoph Hellwigb0b93b42015-04-17 22:37:18 +0200194 if (rq->cmd_type == REQ_TYPE_ATA_SENSE || drive->sense_rq_armed)
Borislav Petkova1df5162009-04-19 07:00:42 +0900195 return;
196
197 memset(sense, 0, sizeof(*sense));
198
199 blk_rq_init(rq->q, sense_rq);
Borislav Petkova1df5162009-04-19 07:00:42 +0900200
Tejun Heo5c4be572009-04-19 07:00:42 +0900201 err = blk_rq_map_kern(drive->queue, sense_rq, sense, sense_len,
202 GFP_NOIO);
203 if (unlikely(err)) {
204 if (printk_ratelimit())
Borislav Petkov103f7032009-04-26 10:39:07 +0200205 printk(KERN_WARNING PFX "%s: failed to map sense "
206 "buffer\n", drive->name);
Tejun Heo5c4be572009-04-19 07:00:42 +0900207 return;
208 }
209
210 sense_rq->rq_disk = rq->rq_disk;
Borislav Petkova1df5162009-04-19 07:00:42 +0900211 sense_rq->cmd[0] = GPCMD_REQUEST_SENSE;
212 sense_rq->cmd[4] = cmd_len;
Christoph Hellwigb0b93b42015-04-17 22:37:18 +0200213 sense_rq->cmd_type = REQ_TYPE_ATA_SENSE;
Borislav Petkova1df5162009-04-19 07:00:42 +0900214 sense_rq->cmd_flags |= REQ_PREEMPT;
215
216 if (drive->media == ide_tape)
217 sense_rq->cmd[13] = REQ_IDETAPE_PC1;
218
219 drive->sense_rq_armed = true;
220}
221EXPORT_SYMBOL_GPL(ide_prep_sense);
222
Tejun Heo5c4be572009-04-19 07:00:42 +0900223int ide_queue_sense_rq(ide_drive_t *drive, void *special)
Borislav Petkova1df5162009-04-19 07:00:42 +0900224{
Tejun Heo5c4be572009-04-19 07:00:42 +0900225 /* deferred failure from ide_prep_sense() */
226 if (!drive->sense_rq_armed) {
Borislav Petkov103f7032009-04-26 10:39:07 +0200227 printk(KERN_WARNING PFX "%s: error queuing a sense request\n",
Tejun Heo5c4be572009-04-19 07:00:42 +0900228 drive->name);
229 return -ENOMEM;
230 }
Borislav Petkova1df5162009-04-19 07:00:42 +0900231
232 drive->sense_rq.special = special;
233 drive->sense_rq_armed = false;
234
235 drive->hwif->rq = NULL;
236
Jens Axboe7eaceac2011-03-10 08:52:07 +0100237 elv_add_request(drive->queue, &drive->sense_rq, ELEVATOR_INSERT_FRONT);
Tejun Heo5c4be572009-04-19 07:00:42 +0900238 return 0;
Borislav Petkova1df5162009-04-19 07:00:42 +0900239}
240EXPORT_SYMBOL_GPL(ide_queue_sense_rq);
241
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +0200242/*
243 * Called when an error was detected during the last packet command.
Borislav Petkov6b544fc2009-04-19 07:00:42 +0900244 * We queue a request sense packet command at the head of the request
245 * queue.
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +0200246 */
Borislav Petkov6b544fc2009-04-19 07:00:42 +0900247void ide_retry_pc(ide_drive_t *drive)
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +0200248{
Tejun Heo8f6205c2009-05-08 11:53:59 +0900249 struct request *failed_rq = drive->hwif->rq;
Borislav Petkov6b544fc2009-04-19 07:00:42 +0900250 struct request *sense_rq = &drive->sense_rq;
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +0200251 struct ide_atapi_pc *pc = &drive->request_sense_pc;
252
253 (void)ide_read_error(drive);
Borislav Petkov6b544fc2009-04-19 07:00:42 +0900254
255 /* init pc from sense_rq */
256 ide_init_pc(pc);
257 memcpy(pc->c, sense_rq->cmd, 12);
Borislav Petkov6b544fc2009-04-19 07:00:42 +0900258
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +0200259 if (drive->media == ide_tape)
Borislav Petkov626542c2009-06-07 15:37:05 +0200260 drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
Borislav Petkov6b544fc2009-04-19 07:00:42 +0900261
Tejun Heo8f6205c2009-05-08 11:53:59 +0900262 /*
263 * Push back the failed request and put request sense on top
264 * of it. The failed command will be retried after sense data
265 * is acquired.
266 */
Tejun Heo8f6205c2009-05-08 11:53:59 +0900267 drive->hwif->rq = NULL;
Herbert Xu1af18502010-03-31 20:13:39 +0000268 ide_requeue_and_plug(drive, failed_rq);
Tejun Heo8f6205c2009-05-08 11:53:59 +0900269 if (ide_queue_sense_rq(drive, pc)) {
Tejun Heo9934c8c2009-05-08 11:54:16 +0900270 blk_start_request(failed_rq);
Tejun Heo8f6205c2009-05-08 11:53:59 +0900271 ide_complete_rq(drive, -EIO, blk_rq_bytes(failed_rq));
272 }
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +0200273}
274EXPORT_SYMBOL_GPL(ide_retry_pc);
275
Borislav Petkov4cad0852009-01-02 16:12:53 +0100276int ide_cd_expiry(ide_drive_t *drive)
277{
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100278 struct request *rq = drive->hwif->rq;
Borislav Petkov4cad0852009-01-02 16:12:53 +0100279 unsigned long wait = 0;
280
281 debug_log("%s: rq->cmd[0]: 0x%x\n", __func__, rq->cmd[0]);
282
283 /*
284 * Some commands are *slow* and normally take a long time to complete.
285 * Usually we can use the ATAPI "disconnect" to bypass this, but not all
286 * commands/drives support that. Let ide_timer_expiry keep polling us
287 * for these.
288 */
289 switch (rq->cmd[0]) {
290 case GPCMD_BLANK:
291 case GPCMD_FORMAT_UNIT:
292 case GPCMD_RESERVE_RZONE_TRACK:
293 case GPCMD_CLOSE_TRACK:
294 case GPCMD_FLUSH_CACHE:
295 wait = ATAPI_WAIT_PC;
296 break;
297 default:
298 if (!(rq->cmd_flags & REQ_QUIET))
Borislav Petkov103f7032009-04-26 10:39:07 +0200299 printk(KERN_INFO PFX "cmd 0x%x timed out\n",
Borislav Petkov4cad0852009-01-02 16:12:53 +0100300 rq->cmd[0]);
301 wait = 0;
302 break;
303 }
304 return wait;
305}
306EXPORT_SYMBOL_GPL(ide_cd_expiry);
307
Borislav Petkov392de1d2009-01-02 16:12:52 +0100308int ide_cd_get_xferlen(struct request *rq)
309{
Christoph Hellwig4c4762d2010-06-19 17:26:47 +0200310 switch (rq->cmd_type) {
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200311 case REQ_TYPE_FS:
Borislav Petkov392de1d2009-01-02 16:12:52 +0100312 return 32768;
Christoph Hellwigb0b93b42015-04-17 22:37:18 +0200313 case REQ_TYPE_ATA_SENSE:
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200314 case REQ_TYPE_BLOCK_PC:
315 case REQ_TYPE_ATA_PC:
Tejun Heo34b7d2c2009-05-07 22:24:43 +0900316 return blk_rq_bytes(rq);
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200317 default:
Borislav Petkov392de1d2009-01-02 16:12:52 +0100318 return 0;
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200319 }
Borislav Petkov392de1d2009-01-02 16:12:52 +0100320}
321EXPORT_SYMBOL_GPL(ide_cd_get_xferlen);
322
Bartlomiej Zolnierkiewicz0d6a9752009-03-24 23:22:46 +0100323void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason)
324{
Sergei Shtylyov3153c262009-04-08 14:13:03 +0200325 struct ide_taskfile tf;
Bartlomiej Zolnierkiewicz0d6a9752009-03-24 23:22:46 +0100326
Sergei Shtylyov3153c262009-04-08 14:13:03 +0200327 drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT |
328 IDE_VALID_LBAM | IDE_VALID_LBAH);
Bartlomiej Zolnierkiewicz0d6a9752009-03-24 23:22:46 +0100329
Sergei Shtylyov3153c262009-04-08 14:13:03 +0200330 *bcount = (tf.lbah << 8) | tf.lbam;
331 *ireason = tf.nsect & 3;
Bartlomiej Zolnierkiewicz0d6a9752009-03-24 23:22:46 +0100332}
333EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason);
334
Bartlomiej Zolnierkiewiczaa5d2de72008-10-13 21:39:32 +0200335/*
Borislav Petkov103f7032009-04-26 10:39:07 +0200336 * Check the contents of the interrupt reason register and attempt to recover if
337 * there are problems.
338 *
339 * Returns:
340 * - 0 if everything's ok
341 * - 1 if the request has to be terminated.
342 */
343int ide_check_ireason(ide_drive_t *drive, struct request *rq, int len,
344 int ireason, int rw)
345{
346 ide_hwif_t *hwif = drive->hwif;
347
348 debug_log("ireason: 0x%x, rw: 0x%x\n", ireason, rw);
349
350 if (ireason == (!rw << 1))
351 return 0;
352 else if (ireason == (rw << 1)) {
353 printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n",
354 drive->name, __func__);
355
356 if (dev_is_idecd(drive))
357 ide_pad_transfer(drive, rw, len);
358 } else if (!rw && ireason == ATAPI_COD) {
359 if (dev_is_idecd(drive)) {
360 /*
361 * Some drives (ASUS) seem to tell us that status info
362 * is available. Just get it and ignore.
363 */
364 (void)hwif->tp_ops->read_status(hwif);
365 return 0;
366 }
367 } else {
368 if (ireason & ATAPI_COD)
369 printk(KERN_ERR PFX "%s: CoD != 0 in %s\n", drive->name,
370 __func__);
371
372 /* drive wants a command packet, or invalid ireason... */
373 printk(KERN_ERR PFX "%s: %s: bad interrupt reason 0x%02x\n",
374 drive->name, __func__, ireason);
375 }
376
377 if (dev_is_idecd(drive) && rq->cmd_type == REQ_TYPE_ATA_PC)
378 rq->cmd_flags |= REQ_FAILED;
379
380 return 1;
381}
382EXPORT_SYMBOL_GPL(ide_check_ireason);
383
384/*
Bartlomiej Zolnierkiewiczaa5d2de72008-10-13 21:39:32 +0200385 * This is the usual interrupt handler which will be called during a packet
386 * command. We will transfer some of the data (as requested by the drive)
387 * and will re-point interrupt handler to us.
388 */
389static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200390{
Bartlomiej Zolnierkiewicz2b9efba2008-10-13 21:39:31 +0200391 struct ide_atapi_pc *pc = drive->pc;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200392 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200393 struct ide_cmd *cmd = &hwif->cmd;
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100394 struct request *rq = hwif->rq;
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200395 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
Bartlomiej Zolnierkiewiczd93bc452009-03-31 20:15:26 +0200396 unsigned int timeout, done;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200397 u16 bcount;
Borislav Petkov5d655a02009-01-02 16:12:54 +0100398 u8 stat, ireason, dsc = 0;
Bartlomiej Zolnierkiewiczd93bc452009-03-31 20:15:26 +0200399 u8 write = !!(pc->flags & PC_FLAG_WRITING);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200400
401 debug_log("Enter %s - interrupt handler\n", __func__);
402
Borislav Petkov5d655a02009-01-02 16:12:54 +0100403 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
404 : WAIT_TAPE_CMD;
Bartlomiej Zolnierkiewicz844b9462008-10-13 21:39:31 +0200405
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200406 /* Clear the interrupt */
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200407 stat = tp_ops->read_status(hwif);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200408
409 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
Bartlomiej Zolnierkiewicz88b41322009-03-31 20:15:22 +0200410 int rc;
Bartlomiej Zolnierkiewicz44530112009-03-31 20:15:20 +0200411
Bartlomiej Zolnierkiewicz88b41322009-03-31 20:15:22 +0200412 drive->waiting_for_dma = 0;
413 rc = hwif->dma_ops->dma_end(drive);
Bartlomiej Zolnierkiewiczf094d4d82009-03-31 20:15:24 +0200414 ide_dma_unmap_sg(drive, cmd);
Bartlomiej Zolnierkiewicz44530112009-03-31 20:15:20 +0200415
416 if (rc || (drive->media == ide_tape && (stat & ATA_ERR))) {
Borislav Petkov5d655a02009-01-02 16:12:54 +0100417 if (drive->media == ide_floppy)
Borislav Petkov103f7032009-04-26 10:39:07 +0200418 printk(KERN_ERR PFX "%s: DMA %s error\n",
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200419 drive->name, rq_data_dir(pc->rq)
420 ? "write" : "read");
421 pc->flags |= PC_FLAG_DMA_ERROR;
Tejun Heo6d700382009-04-19 08:46:03 +0900422 } else
Borislav Petkov077e6db2009-05-01 21:21:02 +0200423 rq->resid_len = 0;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200424 debug_log("%s: DMA finished\n", drive->name);
425 }
426
427 /* No more interrupts */
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200428 if ((stat & ATA_DRQ) == 0) {
Borislav Petkov5b6c9422009-03-31 20:15:34 +0200429 int uptodate, error;
Bartlomiej Zolnierkiewicz03a2faa2009-03-27 12:46:36 +0100430
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200431 debug_log("Packet command completed, %d bytes transferred\n",
Borislav Petkov077e6db2009-05-01 21:21:02 +0200432 blk_rq_bytes(rq));
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200433
434 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
435
436 local_irq_enable_in_hardirq();
437
Borislav Petkov5d655a02009-01-02 16:12:54 +0100438 if (drive->media == ide_tape &&
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200439 (stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
440 stat &= ~ATA_ERR;
Borislav Petkov8fccf892008-07-23 19:56:01 +0200441
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200442 if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) {
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200443 /* Error detected */
444 debug_log("%s: I/O error\n", drive->name);
445
Borislav Petkov5d655a02009-01-02 16:12:54 +0100446 if (drive->media != ide_tape)
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200447 pc->rq->errors++;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200448
Borislav Petkov8fccf892008-07-23 19:56:01 +0200449 if (rq->cmd[0] == REQUEST_SENSE) {
Borislav Petkov103f7032009-04-26 10:39:07 +0200450 printk(KERN_ERR PFX "%s: I/O error in request "
451 "sense command\n", drive->name);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200452 return ide_do_reset(drive);
453 }
454
Borislav Petkov8fccf892008-07-23 19:56:01 +0200455 debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200456
457 /* Retry operation */
Borislav Petkov6b544fc2009-04-19 07:00:42 +0900458 ide_retry_pc(drive);
Borislav Petkov8fccf892008-07-23 19:56:01 +0200459
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200460 /* queued, but not started */
461 return ide_stopped;
462 }
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200463 pc->error = 0;
Bartlomiej Zolnierkiewiczb14c7212008-10-13 21:39:30 +0200464
465 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
466 dsc = 1;
Borislav Petkov8fccf892008-07-23 19:56:01 +0200467
Tejun Heob3071d12009-04-19 08:46:02 +0900468 /*
469 * ->pc_callback() might change rq->data_len for
470 * residual count, cache total length.
471 */
Tejun Heo21d9c5d2009-04-19 08:46:02 +0900472 done = blk_rq_bytes(rq);
Tejun Heob3071d12009-04-19 08:46:02 +0900473
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200474 /* Command finished - Call the callback function */
Bartlomiej Zolnierkiewicz03a2faa2009-03-27 12:46:36 +0100475 uptodate = drive->pc_callback(drive, dsc);
476
477 if (uptodate == 0)
478 drive->failed_pc = NULL;
479
Christoph Hellwig4f8c9512015-04-17 22:37:16 +0200480 if (rq->cmd_type == REQ_TYPE_DRV_PRIV) {
Bartlomiej Zolnierkiewicz6902a532009-03-27 12:46:43 +0100481 rq->errors = 0;
Borislav Petkov5b6c9422009-03-31 20:15:34 +0200482 error = 0;
Bartlomiej Zolnierkiewicz89f78b32009-03-27 12:46:43 +0100483 } else {
Bartlomiej Zolnierkiewicz349d12a2009-03-31 20:15:26 +0200484
Christoph Hellwig4c4762d2010-06-19 17:26:47 +0200485 if (rq->cmd_type != REQ_TYPE_FS && uptodate <= 0) {
Bartlomiej Zolnierkiewicz89f78b32009-03-27 12:46:43 +0100486 if (rq->errors == 0)
487 rq->errors = -EIO;
488 }
Bartlomiej Zolnierkiewicz349d12a2009-03-31 20:15:26 +0200489
Borislav Petkov5b6c9422009-03-31 20:15:34 +0200490 error = uptodate ? 0 : -EIO;
Bartlomiej Zolnierkiewicz89f78b32009-03-27 12:46:43 +0100491 }
Borislav Petkov8fccf892008-07-23 19:56:01 +0200492
Tejun Heoc3a4d782009-05-07 22:24:37 +0900493 ide_complete_rq(drive, error, blk_rq_bytes(rq));
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200494 return ide_stopped;
495 }
496
497 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
498 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
Borislav Petkov103f7032009-04-26 10:39:07 +0200499 printk(KERN_ERR PFX "%s: The device wants to issue more "
500 "interrupts in DMA mode\n", drive->name);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200501 ide_dma_off(drive);
502 return ide_do_reset(drive);
503 }
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200504
Bartlomiej Zolnierkiewicz18236492008-07-23 19:55:54 +0200505 /* Get the number of bytes to transfer on this interrupt. */
506 ide_read_bcount_and_ireason(drive, &bcount, &ireason);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200507
Borislav Petkov103f7032009-04-26 10:39:07 +0200508 if (ide_check_ireason(drive, rq, bcount, ireason, write))
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200509 return ide_do_reset(drive);
Borislav Petkov8fccf892008-07-23 19:56:01 +0200510
Tejun Heo6d700382009-04-19 08:46:03 +0900511 done = min_t(unsigned int, bcount, cmd->nleft);
512 ide_pio_bytes(drive, cmd, write, done);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200513
Tejun Heo6d700382009-04-19 08:46:03 +0900514 /* Update transferred byte count */
Borislav Petkov077e6db2009-05-01 21:21:02 +0200515 rq->resid_len -= done;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200516
Bartlomiej Zolnierkiewiczd93bc452009-03-31 20:15:26 +0200517 bcount -= done;
518
519 if (bcount)
520 ide_pad_transfer(drive, write, bcount);
521
Borislav Petkov077e6db2009-05-01 21:21:02 +0200522 debug_log("[cmd %x] transferred %d bytes, padded %d bytes, resid: %u\n",
523 rq->cmd[0], done, bcount, rq->resid_len);
Bartlomiej Zolnierkiewiczd93bc452009-03-31 20:15:26 +0200524
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200525 /* And set the interrupt handler again */
Bartlomiej Zolnierkiewicz60c0cd02009-03-27 12:46:46 +0100526 ide_set_handler(drive, ide_pc_intr, timeout);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200527 return ide_started;
528}
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200529
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200530static void ide_init_packet_cmd(struct ide_cmd *cmd, u8 valid_tf,
Bartlomiej Zolnierkiewiczb788ee92009-03-27 12:46:46 +0100531 u16 bcount, u8 dma)
Bartlomiej Zolnierkiewicz7a254df2009-03-24 23:22:39 +0100532{
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200533 cmd->protocol = dma ? ATAPI_PROT_DMA : ATAPI_PROT_PIO;
534 cmd->valid.out.tf = IDE_VALID_LBAH | IDE_VALID_LBAM |
535 IDE_VALID_FEATURE | valid_tf;
Bartlomiej Zolnierkiewicz35b5d0b2009-03-27 12:46:47 +0100536 cmd->tf.command = ATA_CMD_PACKET;
Bartlomiej Zolnierkiewiczb788ee92009-03-27 12:46:46 +0100537 cmd->tf.feature = dma; /* Use PIO/DMA */
538 cmd->tf.lbam = bcount & 0xff;
539 cmd->tf.lbah = (bcount >> 8) & 0xff;
Bartlomiej Zolnierkiewicz7a254df2009-03-24 23:22:39 +0100540}
541
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200542static u8 ide_read_ireason(ide_drive_t *drive)
543{
Sergei Shtylyov3153c262009-04-08 14:13:03 +0200544 struct ide_taskfile tf;
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200545
Sergei Shtylyov3153c262009-04-08 14:13:03 +0200546 drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT);
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200547
Sergei Shtylyov3153c262009-04-08 14:13:03 +0200548 return tf.nsect & 3;
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200549}
550
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200551static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
552{
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200553 int retries = 100;
554
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200555 while (retries-- && ((ireason & ATAPI_COD) == 0 ||
556 (ireason & ATAPI_IO))) {
Borislav Petkov103f7032009-04-26 10:39:07 +0200557 printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing "
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200558 "a packet command, retrying\n", drive->name);
559 udelay(100);
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200560 ireason = ide_read_ireason(drive);
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200561 if (retries == 0) {
Borislav Petkov103f7032009-04-26 10:39:07 +0200562 printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing"
563 " a packet command, ignoring\n",
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200564 drive->name);
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200565 ireason |= ATAPI_COD;
566 ireason &= ~ATAPI_IO;
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200567 }
568 }
569
570 return ireason;
571}
572
Bartlomiej Zolnierkiewiczbaf08f02008-10-13 21:39:32 +0200573static int ide_delayed_transfer_pc(ide_drive_t *drive)
574{
575 /* Send the actual packet */
576 drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12);
577
578 /* Timeout for the packet command */
579 return WAIT_FLOPPY_CMD;
580}
581
582static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200583{
Borislav Petkovb16aabc2009-01-02 16:12:56 +0100584 struct ide_atapi_pc *uninitialized_var(pc);
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200585 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100586 struct request *rq = hwif->rq;
Bartlomiej Zolnierkiewiczbaf08f02008-10-13 21:39:32 +0200587 ide_expiry_t *expiry;
588 unsigned int timeout;
Borislav Petkov8c662852009-01-02 16:12:54 +0100589 int cmd_len;
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200590 ide_startstop_t startstop;
591 u8 ireason;
592
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200593 if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
Borislav Petkov103f7032009-04-26 10:39:07 +0200594 printk(KERN_ERR PFX "%s: Strange, packet command initiated yet "
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200595 "DRQ isn't asserted\n", drive->name);
596 return startstop;
597 }
598
Borislav Petkov5f258432009-01-02 16:12:53 +0100599 if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
600 if (drive->dma)
601 drive->waiting_for_dma = 1;
602 }
603
Borislav Petkov8c662852009-01-02 16:12:54 +0100604 if (dev_is_idecd(drive)) {
605 /* ATAPI commands get padded out to 12 bytes minimum */
606 cmd_len = COMMAND_SIZE(rq->cmd[0]);
607 if (cmd_len < ATAPI_MIN_CDB_BYTES)
608 cmd_len = ATAPI_MIN_CDB_BYTES;
Borislav Petkovdef860d2009-01-02 16:12:55 +0100609
610 timeout = rq->timeout;
611 expiry = ide_cd_expiry;
612 } else {
Borislav Petkovb16aabc2009-01-02 16:12:56 +0100613 pc = drive->pc;
614
Borislav Petkov8c662852009-01-02 16:12:54 +0100615 cmd_len = ATAPI_MIN_CDB_BYTES;
616
Borislav Petkovdef860d2009-01-02 16:12:55 +0100617 /*
618 * If necessary schedule the packet transfer to occur 'timeout'
Martin Olsson19af5cd2009-04-23 11:37:37 +0200619 * milliseconds later in ide_delayed_transfer_pc() after the
Borislav Petkovdef860d2009-01-02 16:12:55 +0100620 * device says it's ready for a packet.
621 */
622 if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
623 timeout = drive->pc_delay;
624 expiry = &ide_delayed_transfer_pc;
625 } else {
626 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
627 : WAIT_TAPE_CMD;
628 expiry = NULL;
629 }
Borislav Petkov06cc2772009-01-02 16:12:56 +0100630
631 ireason = ide_read_ireason(drive);
632 if (drive->media == ide_tape)
633 ireason = ide_wait_ireason(drive, ireason);
634
635 if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) {
Borislav Petkov103f7032009-04-26 10:39:07 +0200636 printk(KERN_ERR PFX "%s: (IO,CoD) != (0,1) while "
637 "issuing a packet command\n", drive->name);
Borislav Petkov06cc2772009-01-02 16:12:56 +0100638
639 return ide_do_reset(drive);
640 }
Bartlomiej Zolnierkiewiczbaf08f02008-10-13 21:39:32 +0200641 }
642
Bartlomiej Zolnierkiewicz60c0cd02009-03-27 12:46:46 +0100643 hwif->expiry = expiry;
644
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200645 /* Set the interrupt routine */
Borislav Petkovd6251d42009-01-06 17:20:58 +0100646 ide_set_handler(drive,
647 (dev_is_idecd(drive) ? drive->irq_handler
648 : ide_pc_intr),
Bartlomiej Zolnierkiewicz60c0cd02009-03-27 12:46:46 +0100649 timeout);
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200650
Borislav Petkov2eba0822009-03-31 20:14:58 +0200651 /* Send the actual packet */
652 if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
653 hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
654
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200655 /* Begin DMA, if necessary */
Borislav Petkovb16aabc2009-01-02 16:12:56 +0100656 if (dev_is_idecd(drive)) {
657 if (drive->dma)
658 hwif->dma_ops->dma_start(drive);
659 } else {
660 if (pc->flags & PC_FLAG_DMA_OK) {
661 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
662 hwif->dma_ops->dma_start(drive);
663 }
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200664 }
665
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200666 return ide_started;
667}
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200668
Bartlomiej Zolnierkiewiczb788ee92009-03-27 12:46:46 +0100669ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200670{
Borislav Petkovd77612a2009-01-02 16:12:55 +0100671 struct ide_atapi_pc *pc;
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200672 ide_hwif_t *hwif = drive->hwif;
Borislav Petkov4cad0852009-01-02 16:12:53 +0100673 ide_expiry_t *expiry = NULL;
Bartlomiej Zolnierkiewicze6830a82009-03-27 12:46:37 +0100674 struct request *rq = hwif->rq;
Borislav Petkovdfb7e622009-05-01 20:35:21 +0200675 unsigned int timeout, bytes;
Borislav Petkov392de1d2009-01-02 16:12:52 +0100676 u16 bcount;
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200677 u8 valid_tf;
Bartlomiej Zolnierkiewicz35b5d0b2009-03-27 12:46:47 +0100678 u8 drq_int = !!(drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT);
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200679
Borislav Petkoved485542009-01-02 16:12:52 +0100680 if (dev_is_idecd(drive)) {
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200681 valid_tf = IDE_VALID_NSECT | IDE_VALID_LBAL;
Bartlomiej Zolnierkiewicze6830a82009-03-27 12:46:37 +0100682 bcount = ide_cd_get_xferlen(rq);
Borislav Petkov4cad0852009-01-02 16:12:53 +0100683 expiry = ide_cd_expiry;
Borislav Petkov28ad91d2009-01-02 16:12:56 +0100684 timeout = ATAPI_WAIT_PC;
Borislav Petkovd77612a2009-01-02 16:12:55 +0100685
Bartlomiej Zolnierkiewicz5ae54122009-03-31 20:15:20 +0200686 if (drive->dma)
687 drive->dma = !ide_dma_prepare(drive, cmd);
Borislav Petkoved485542009-01-02 16:12:52 +0100688 } else {
Borislav Petkovd77612a2009-01-02 16:12:55 +0100689 pc = drive->pc;
690
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200691 valid_tf = IDE_VALID_DEVICE;
Borislav Petkovdfb7e622009-05-01 20:35:21 +0200692 bytes = blk_rq_bytes(rq);
Borislav Petkovdfb7e622009-05-01 20:35:21 +0200693 bcount = ((drive->media == ide_tape) ? bytes
694 : min_t(unsigned int,
695 bytes, 63 * 1024));
Borislav Petkovd77612a2009-01-02 16:12:55 +0100696
Borislav Petkov077e6db2009-05-01 21:21:02 +0200697 /* We haven't transferred any data yet */
698 rq->resid_len = bcount;
Borislav Petkovd77612a2009-01-02 16:12:55 +0100699
700 if (pc->flags & PC_FLAG_DMA_ERROR) {
701 pc->flags &= ~PC_FLAG_DMA_ERROR;
702 ide_dma_off(drive);
703 }
704
Bartlomiej Zolnierkiewicz5ae54122009-03-31 20:15:20 +0200705 if (pc->flags & PC_FLAG_DMA_OK)
706 drive->dma = !ide_dma_prepare(drive, cmd);
Borislav Petkovd77612a2009-01-02 16:12:55 +0100707
708 if (!drive->dma)
709 pc->flags &= ~PC_FLAG_DMA_OK;
Borislav Petkov28ad91d2009-01-02 16:12:56 +0100710
711 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
712 : WAIT_TAPE_CMD;
Borislav Petkoved485542009-01-02 16:12:52 +0100713 }
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200714
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200715 ide_init_packet_cmd(cmd, valid_tf, bcount, drive->dma);
Bartlomiej Zolnierkiewiczb788ee92009-03-27 12:46:46 +0100716
717 (void)do_rw_taskfile(drive, cmd);
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200718
Bartlomiej Zolnierkiewicz35b5d0b2009-03-27 12:46:47 +0100719 if (drq_int) {
Borislav Petkov5f258432009-01-02 16:12:53 +0100720 if (drive->dma)
721 drive->waiting_for_dma = 0;
Bartlomiej Zolnierkiewicz22117d62009-03-27 12:46:47 +0100722 hwif->expiry = expiry;
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200723 }
Bartlomiej Zolnierkiewicz35b5d0b2009-03-27 12:46:47 +0100724
725 ide_execute_command(drive, cmd, ide_transfer_pc, timeout);
726
727 return drq_int ? ide_started : ide_transfer_pc(drive);
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200728}
729EXPORT_SYMBOL_GPL(ide_issue_pc);