Root/drivers/ide/ide-atapi.c

1/*
2 * ATAPI support.
3 */
4
5#include <linux/kernel.h>
6#include <linux/cdrom.h>
7#include <linux/delay.h>
8#include <linux/export.h>
9#include <linux/ide.h>
10#include <linux/scatterlist.h>
11#include <linux/gfp.h>
12
13#include <scsi/scsi.h>
14
15#define DRV_NAME "ide-atapi"
16#define PFX DRV_NAME ": "
17
18#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
25#define ATAPI_MIN_CDB_BYTES 12
26
27static inline int dev_is_idecd(ide_drive_t *drive)
28{
29    return drive->media == ide_cdrom || drive->media == ide_optical;
30}
31
32/*
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
79void ide_init_pc(struct ide_atapi_pc *pc)
80{
81    memset(pc, 0, sizeof(*pc));
82}
83EXPORT_SYMBOL_GPL(ide_init_pc);
84
85/*
86 * 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,
90              struct ide_atapi_pc *pc, void *buf, unsigned int bufflen)
91{
92    struct request *rq;
93    int error;
94
95    rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
96    rq->cmd_type = REQ_TYPE_SPECIAL;
97    rq->special = (char *)pc;
98
99    if (buf && bufflen) {
100        error = blk_rq_map_kern(drive->queue, rq, buf, bufflen,
101                    GFP_NOIO);
102        if (error)
103            goto put_req;
104    }
105
106    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);
110put_req:
111    blk_put_request(rq);
112    return error;
113}
114EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
115
116int 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
123    return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
124}
125EXPORT_SYMBOL_GPL(ide_do_test_unit_ready);
126
127int 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
138    return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
139}
140EXPORT_SYMBOL_GPL(ide_do_start_stop);
141
142int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on)
143{
144    struct ide_atapi_pc pc;
145
146    if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)
147        return 0;
148
149    ide_init_pc(&pc);
150    pc.c[0] = ALLOW_MEDIUM_REMOVAL;
151    pc.c[4] = on;
152
153    return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
154}
155EXPORT_SYMBOL_GPL(ide_set_media_lock);
156
157void 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
171void 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;
176    int err;
177
178    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
194    if (rq->cmd_type == REQ_TYPE_SENSE || drive->sense_rq_armed)
195        return;
196
197    memset(sense, 0, sizeof(*sense));
198
199    blk_rq_init(rq->q, sense_rq);
200
201    err = blk_rq_map_kern(drive->queue, sense_rq, sense, sense_len,
202                  GFP_NOIO);
203    if (unlikely(err)) {
204        if (printk_ratelimit())
205            printk(KERN_WARNING PFX "%s: failed to map sense "
206                        "buffer\n", drive->name);
207        return;
208    }
209
210    sense_rq->rq_disk = rq->rq_disk;
211    sense_rq->cmd[0] = GPCMD_REQUEST_SENSE;
212    sense_rq->cmd[4] = cmd_len;
213    sense_rq->cmd_type = REQ_TYPE_SENSE;
214    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
223int ide_queue_sense_rq(ide_drive_t *drive, void *special)
224{
225    /* deferred failure from ide_prep_sense() */
226    if (!drive->sense_rq_armed) {
227        printk(KERN_WARNING PFX "%s: error queuing a sense request\n",
228               drive->name);
229        return -ENOMEM;
230    }
231
232    drive->sense_rq.special = special;
233    drive->sense_rq_armed = false;
234
235    drive->hwif->rq = NULL;
236
237    elv_add_request(drive->queue, &drive->sense_rq, ELEVATOR_INSERT_FRONT);
238    return 0;
239}
240EXPORT_SYMBOL_GPL(ide_queue_sense_rq);
241
242/*
243 * Called when an error was detected during the last packet command.
244 * We queue a request sense packet command at the head of the request
245 * queue.
246 */
247void ide_retry_pc(ide_drive_t *drive)
248{
249    struct request *failed_rq = drive->hwif->rq;
250    struct request *sense_rq = &drive->sense_rq;
251    struct ide_atapi_pc *pc = &drive->request_sense_pc;
252
253    (void)ide_read_error(drive);
254
255    /* init pc from sense_rq */
256    ide_init_pc(pc);
257    memcpy(pc->c, sense_rq->cmd, 12);
258
259    if (drive->media == ide_tape)
260        drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
261
262    /*
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     */
267    drive->hwif->rq = NULL;
268    ide_requeue_and_plug(drive, failed_rq);
269    if (ide_queue_sense_rq(drive, pc)) {
270        blk_start_request(failed_rq);
271        ide_complete_rq(drive, -EIO, blk_rq_bytes(failed_rq));
272    }
273}
274EXPORT_SYMBOL_GPL(ide_retry_pc);
275
276int ide_cd_expiry(ide_drive_t *drive)
277{
278    struct request *rq = drive->hwif->rq;
279    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))
299            printk(KERN_INFO PFX "cmd 0x%x timed out\n",
300                     rq->cmd[0]);
301        wait = 0;
302        break;
303    }
304    return wait;
305}
306EXPORT_SYMBOL_GPL(ide_cd_expiry);
307
308int ide_cd_get_xferlen(struct request *rq)
309{
310    switch (rq->cmd_type) {
311    case REQ_TYPE_FS:
312        return 32768;
313    case REQ_TYPE_SENSE:
314    case REQ_TYPE_BLOCK_PC:
315    case REQ_TYPE_ATA_PC:
316        return blk_rq_bytes(rq);
317    default:
318        return 0;
319    }
320}
321EXPORT_SYMBOL_GPL(ide_cd_get_xferlen);
322
323void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason)
324{
325    struct ide_taskfile tf;
326
327    drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT |
328                     IDE_VALID_LBAM | IDE_VALID_LBAH);
329
330    *bcount = (tf.lbah << 8) | tf.lbam;
331    *ireason = tf.nsect & 3;
332}
333EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason);
334
335/*
336 * 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/*
385 * 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)
390{
391    struct ide_atapi_pc *pc = drive->pc;
392    ide_hwif_t *hwif = drive->hwif;
393    struct ide_cmd *cmd = &hwif->cmd;
394    struct request *rq = hwif->rq;
395    const struct ide_tp_ops *tp_ops = hwif->tp_ops;
396    unsigned int timeout, done;
397    u16 bcount;
398    u8 stat, ireason, dsc = 0;
399    u8 write = !!(pc->flags & PC_FLAG_WRITING);
400
401    debug_log("Enter %s - interrupt handler\n", __func__);
402
403    timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
404                           : WAIT_TAPE_CMD;
405
406    /* Clear the interrupt */
407    stat = tp_ops->read_status(hwif);
408
409    if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
410        int rc;
411
412        drive->waiting_for_dma = 0;
413        rc = hwif->dma_ops->dma_end(drive);
414        ide_dma_unmap_sg(drive, cmd);
415
416        if (rc || (drive->media == ide_tape && (stat & ATA_ERR))) {
417            if (drive->media == ide_floppy)
418                printk(KERN_ERR PFX "%s: DMA %s error\n",
419                    drive->name, rq_data_dir(pc->rq)
420                             ? "write" : "read");
421            pc->flags |= PC_FLAG_DMA_ERROR;
422        } else
423            rq->resid_len = 0;
424        debug_log("%s: DMA finished\n", drive->name);
425    }
426
427    /* No more interrupts */
428    if ((stat & ATA_DRQ) == 0) {
429        int uptodate, error;
430
431        debug_log("Packet command completed, %d bytes transferred\n",
432              blk_rq_bytes(rq));
433
434        pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
435
436        local_irq_enable_in_hardirq();
437
438        if (drive->media == ide_tape &&
439            (stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
440            stat &= ~ATA_ERR;
441
442        if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) {
443            /* Error detected */
444            debug_log("%s: I/O error\n", drive->name);
445
446            if (drive->media != ide_tape)
447                pc->rq->errors++;
448
449            if (rq->cmd[0] == REQUEST_SENSE) {
450                printk(KERN_ERR PFX "%s: I/O error in request "
451                        "sense command\n", drive->name);
452                return ide_do_reset(drive);
453            }
454
455            debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
456
457            /* Retry operation */
458            ide_retry_pc(drive);
459
460            /* queued, but not started */
461            return ide_stopped;
462        }
463        pc->error = 0;
464
465        if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
466            dsc = 1;
467
468        /*
469         * ->pc_callback() might change rq->data_len for
470         * residual count, cache total length.
471         */
472        done = blk_rq_bytes(rq);
473
474        /* Command finished - Call the callback function */
475        uptodate = drive->pc_callback(drive, dsc);
476
477        if (uptodate == 0)
478            drive->failed_pc = NULL;
479
480        if (rq->cmd_type == REQ_TYPE_SPECIAL) {
481            rq->errors = 0;
482            error = 0;
483        } else {
484
485            if (rq->cmd_type != REQ_TYPE_FS && uptodate <= 0) {
486                if (rq->errors == 0)
487                    rq->errors = -EIO;
488            }
489
490            error = uptodate ? 0 : -EIO;
491        }
492
493        ide_complete_rq(drive, error, blk_rq_bytes(rq));
494        return ide_stopped;
495    }
496
497    if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
498        pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
499        printk(KERN_ERR PFX "%s: The device wants to issue more "
500                "interrupts in DMA mode\n", drive->name);
501        ide_dma_off(drive);
502        return ide_do_reset(drive);
503    }
504
505    /* Get the number of bytes to transfer on this interrupt. */
506    ide_read_bcount_and_ireason(drive, &bcount, &ireason);
507
508    if (ide_check_ireason(drive, rq, bcount, ireason, write))
509        return ide_do_reset(drive);
510
511    done = min_t(unsigned int, bcount, cmd->nleft);
512    ide_pio_bytes(drive, cmd, write, done);
513
514    /* Update transferred byte count */
515    rq->resid_len -= done;
516
517    bcount -= done;
518
519    if (bcount)
520        ide_pad_transfer(drive, write, bcount);
521
522    debug_log("[cmd %x] transferred %d bytes, padded %d bytes, resid: %u\n",
523          rq->cmd[0], done, bcount, rq->resid_len);
524
525    /* And set the interrupt handler again */
526    ide_set_handler(drive, ide_pc_intr, timeout);
527    return ide_started;
528}
529
530static void ide_init_packet_cmd(struct ide_cmd *cmd, u8 valid_tf,
531                u16 bcount, u8 dma)
532{
533    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;
536    cmd->tf.command = ATA_CMD_PACKET;
537    cmd->tf.feature = dma; /* Use PIO/DMA */
538    cmd->tf.lbam = bcount & 0xff;
539    cmd->tf.lbah = (bcount >> 8) & 0xff;
540}
541
542static u8 ide_read_ireason(ide_drive_t *drive)
543{
544    struct ide_taskfile tf;
545
546    drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT);
547
548    return tf.nsect & 3;
549}
550
551static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
552{
553    int retries = 100;
554
555    while (retries-- && ((ireason & ATAPI_COD) == 0 ||
556        (ireason & ATAPI_IO))) {
557        printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing "
558                "a packet command, retrying\n", drive->name);
559        udelay(100);
560        ireason = ide_read_ireason(drive);
561        if (retries == 0) {
562            printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing"
563                    " a packet command, ignoring\n",
564                    drive->name);
565            ireason |= ATAPI_COD;
566            ireason &= ~ATAPI_IO;
567        }
568    }
569
570    return ireason;
571}
572
573static 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)
583{
584    struct ide_atapi_pc *uninitialized_var(pc);
585    ide_hwif_t *hwif = drive->hwif;
586    struct request *rq = hwif->rq;
587    ide_expiry_t *expiry;
588    unsigned int timeout;
589    int cmd_len;
590    ide_startstop_t startstop;
591    u8 ireason;
592
593    if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
594        printk(KERN_ERR PFX "%s: Strange, packet command initiated yet "
595                "DRQ isn't asserted\n", drive->name);
596        return startstop;
597    }
598
599    if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
600        if (drive->dma)
601            drive->waiting_for_dma = 1;
602    }
603
604    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;
609
610        timeout = rq->timeout;
611        expiry = ide_cd_expiry;
612    } else {
613        pc = drive->pc;
614
615        cmd_len = ATAPI_MIN_CDB_BYTES;
616
617        /*
618         * If necessary schedule the packet transfer to occur 'timeout'
619         * milliseconds later in ide_delayed_transfer_pc() after the
620         * 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        }
630
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)) {
636            printk(KERN_ERR PFX "%s: (IO,CoD) != (0,1) while "
637                "issuing a packet command\n", drive->name);
638
639            return ide_do_reset(drive);
640        }
641    }
642
643    hwif->expiry = expiry;
644
645    /* Set the interrupt routine */
646    ide_set_handler(drive,
647            (dev_is_idecd(drive) ? drive->irq_handler
648                         : ide_pc_intr),
649            timeout);
650
651    /* 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
655    /* Begin DMA, if necessary */
656    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        }
664    }
665
666    return ide_started;
667}
668
669ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
670{
671    struct ide_atapi_pc *pc;
672    ide_hwif_t *hwif = drive->hwif;
673    ide_expiry_t *expiry = NULL;
674    struct request *rq = hwif->rq;
675    unsigned int timeout, bytes;
676    u16 bcount;
677    u8 valid_tf;
678    u8 drq_int = !!(drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT);
679
680    if (dev_is_idecd(drive)) {
681        valid_tf = IDE_VALID_NSECT | IDE_VALID_LBAL;
682        bcount = ide_cd_get_xferlen(rq);
683        expiry = ide_cd_expiry;
684        timeout = ATAPI_WAIT_PC;
685
686        if (drive->dma)
687            drive->dma = !ide_dma_prepare(drive, cmd);
688    } else {
689        pc = drive->pc;
690
691        valid_tf = IDE_VALID_DEVICE;
692        bytes = blk_rq_bytes(rq);
693        bcount = ((drive->media == ide_tape) ? bytes
694                             : min_t(unsigned int,
695                                 bytes, 63 * 1024));
696
697        /* We haven't transferred any data yet */
698        rq->resid_len = bcount;
699
700        if (pc->flags & PC_FLAG_DMA_ERROR) {
701            pc->flags &= ~PC_FLAG_DMA_ERROR;
702            ide_dma_off(drive);
703        }
704
705        if (pc->flags & PC_FLAG_DMA_OK)
706            drive->dma = !ide_dma_prepare(drive, cmd);
707
708        if (!drive->dma)
709            pc->flags &= ~PC_FLAG_DMA_OK;
710
711        timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
712                               : WAIT_TAPE_CMD;
713    }
714
715    ide_init_packet_cmd(cmd, valid_tf, bcount, drive->dma);
716
717    (void)do_rw_taskfile(drive, cmd);
718
719    if (drq_int) {
720        if (drive->dma)
721            drive->waiting_for_dma = 0;
722        hwif->expiry = expiry;
723    }
724
725    ide_execute_command(drive, cmd, ide_transfer_pc, timeout);
726
727    return drq_int ? ide_started : ide_transfer_pc(drive);
728}
729EXPORT_SYMBOL_GPL(ide_issue_pc);
730

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