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![Paul Gortmaker](/assets/img/avatar_default.png)
They were getting this implicitly by an include of module.h from device.h -- but we are going to clean that up and break that include chain, so include export.h explicitly now. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
729 lines
18 KiB
C
729 lines
18 KiB
C
/*
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* ATAPI support.
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*/
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#include <linux/kernel.h>
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#include <linux/cdrom.h>
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#include <linux/delay.h>
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#include <linux/export.h>
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#include <linux/ide.h>
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#include <linux/scatterlist.h>
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#include <linux/gfp.h>
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#include <scsi/scsi.h>
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#define DRV_NAME "ide-atapi"
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#define PFX DRV_NAME ": "
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#ifdef DEBUG
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#define debug_log(fmt, args...) \
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printk(KERN_INFO "ide: " fmt, ## args)
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#else
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#define debug_log(fmt, args...) do {} while (0)
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#endif
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#define ATAPI_MIN_CDB_BYTES 12
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static inline int dev_is_idecd(ide_drive_t *drive)
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{
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return drive->media == ide_cdrom || drive->media == ide_optical;
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}
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/*
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* Check whether we can support a device,
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* based on the ATAPI IDENTIFY command results.
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*/
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int ide_check_atapi_device(ide_drive_t *drive, const char *s)
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{
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u16 *id = drive->id;
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u8 gcw[2], protocol, device_type, removable, drq_type, packet_size;
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*((u16 *)&gcw) = id[ATA_ID_CONFIG];
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protocol = (gcw[1] & 0xC0) >> 6;
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device_type = gcw[1] & 0x1F;
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removable = (gcw[0] & 0x80) >> 7;
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drq_type = (gcw[0] & 0x60) >> 5;
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packet_size = gcw[0] & 0x03;
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#ifdef CONFIG_PPC
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/* kludge for Apple PowerBook internal zip */
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if (drive->media == ide_floppy && device_type == 5 &&
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!strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&
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strstr((char *)&id[ATA_ID_PROD], "ZIP"))
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device_type = 0;
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#endif
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if (protocol != 2)
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printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n",
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s, drive->name, protocol);
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else if ((drive->media == ide_floppy && device_type != 0) ||
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(drive->media == ide_tape && device_type != 1))
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printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n",
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s, drive->name, device_type);
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else if (removable == 0)
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printk(KERN_ERR "%s: %s: the removable flag is not set\n",
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s, drive->name);
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else if (drive->media == ide_floppy && drq_type == 3)
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printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not "
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"supported\n", s, drive->name, drq_type);
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else if (packet_size != 0)
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printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 "
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"bytes\n", s, drive->name, packet_size);
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else
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return 1;
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return 0;
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}
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EXPORT_SYMBOL_GPL(ide_check_atapi_device);
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void ide_init_pc(struct ide_atapi_pc *pc)
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{
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memset(pc, 0, sizeof(*pc));
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}
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EXPORT_SYMBOL_GPL(ide_init_pc);
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/*
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* Add a special packet command request to the tail of the request queue,
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* and wait for it to be serviced.
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*/
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int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
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struct ide_atapi_pc *pc, void *buf, unsigned int bufflen)
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{
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struct request *rq;
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int error;
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rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
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rq->cmd_type = REQ_TYPE_SPECIAL;
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rq->special = (char *)pc;
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if (buf && bufflen) {
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error = blk_rq_map_kern(drive->queue, rq, buf, bufflen,
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GFP_NOIO);
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if (error)
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goto put_req;
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}
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memcpy(rq->cmd, pc->c, 12);
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if (drive->media == ide_tape)
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rq->cmd[13] = REQ_IDETAPE_PC1;
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error = blk_execute_rq(drive->queue, disk, rq, 0);
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put_req:
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blk_put_request(rq);
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return error;
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}
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EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
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int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk)
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{
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struct ide_atapi_pc pc;
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ide_init_pc(&pc);
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pc.c[0] = TEST_UNIT_READY;
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return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
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}
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EXPORT_SYMBOL_GPL(ide_do_test_unit_ready);
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int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start)
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{
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struct ide_atapi_pc pc;
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ide_init_pc(&pc);
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pc.c[0] = START_STOP;
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pc.c[4] = start;
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if (drive->media == ide_tape)
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pc.flags |= PC_FLAG_WAIT_FOR_DSC;
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return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
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}
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EXPORT_SYMBOL_GPL(ide_do_start_stop);
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int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on)
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{
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struct ide_atapi_pc pc;
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if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)
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return 0;
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ide_init_pc(&pc);
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pc.c[0] = ALLOW_MEDIUM_REMOVAL;
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pc.c[4] = on;
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return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
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}
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EXPORT_SYMBOL_GPL(ide_set_media_lock);
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void ide_create_request_sense_cmd(ide_drive_t *drive, struct ide_atapi_pc *pc)
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{
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ide_init_pc(pc);
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pc->c[0] = REQUEST_SENSE;
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if (drive->media == ide_floppy) {
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pc->c[4] = 255;
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pc->req_xfer = 18;
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} else {
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pc->c[4] = 20;
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pc->req_xfer = 20;
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}
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}
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EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd);
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void ide_prep_sense(ide_drive_t *drive, struct request *rq)
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{
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struct request_sense *sense = &drive->sense_data;
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struct request *sense_rq = &drive->sense_rq;
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unsigned int cmd_len, sense_len;
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int err;
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switch (drive->media) {
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case ide_floppy:
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cmd_len = 255;
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sense_len = 18;
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break;
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case ide_tape:
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cmd_len = 20;
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sense_len = 20;
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break;
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default:
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cmd_len = 18;
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sense_len = 18;
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}
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BUG_ON(sense_len > sizeof(*sense));
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if (rq->cmd_type == REQ_TYPE_SENSE || drive->sense_rq_armed)
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return;
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memset(sense, 0, sizeof(*sense));
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blk_rq_init(rq->q, sense_rq);
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err = blk_rq_map_kern(drive->queue, sense_rq, sense, sense_len,
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GFP_NOIO);
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if (unlikely(err)) {
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if (printk_ratelimit())
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printk(KERN_WARNING PFX "%s: failed to map sense "
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"buffer\n", drive->name);
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return;
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}
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sense_rq->rq_disk = rq->rq_disk;
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sense_rq->cmd[0] = GPCMD_REQUEST_SENSE;
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sense_rq->cmd[4] = cmd_len;
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sense_rq->cmd_type = REQ_TYPE_SENSE;
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sense_rq->cmd_flags |= REQ_PREEMPT;
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if (drive->media == ide_tape)
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sense_rq->cmd[13] = REQ_IDETAPE_PC1;
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drive->sense_rq_armed = true;
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}
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EXPORT_SYMBOL_GPL(ide_prep_sense);
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int ide_queue_sense_rq(ide_drive_t *drive, void *special)
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{
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/* deferred failure from ide_prep_sense() */
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if (!drive->sense_rq_armed) {
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printk(KERN_WARNING PFX "%s: error queuing a sense request\n",
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drive->name);
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return -ENOMEM;
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}
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drive->sense_rq.special = special;
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drive->sense_rq_armed = false;
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drive->hwif->rq = NULL;
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elv_add_request(drive->queue, &drive->sense_rq, ELEVATOR_INSERT_FRONT);
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return 0;
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}
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EXPORT_SYMBOL_GPL(ide_queue_sense_rq);
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/*
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* Called when an error was detected during the last packet command.
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* We queue a request sense packet command at the head of the request
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* queue.
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*/
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void ide_retry_pc(ide_drive_t *drive)
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{
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struct request *failed_rq = drive->hwif->rq;
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struct request *sense_rq = &drive->sense_rq;
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struct ide_atapi_pc *pc = &drive->request_sense_pc;
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(void)ide_read_error(drive);
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/* init pc from sense_rq */
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ide_init_pc(pc);
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memcpy(pc->c, sense_rq->cmd, 12);
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if (drive->media == ide_tape)
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drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
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/*
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* Push back the failed request and put request sense on top
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* of it. The failed command will be retried after sense data
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* is acquired.
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*/
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drive->hwif->rq = NULL;
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ide_requeue_and_plug(drive, failed_rq);
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if (ide_queue_sense_rq(drive, pc)) {
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blk_start_request(failed_rq);
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ide_complete_rq(drive, -EIO, blk_rq_bytes(failed_rq));
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}
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}
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EXPORT_SYMBOL_GPL(ide_retry_pc);
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int ide_cd_expiry(ide_drive_t *drive)
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{
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struct request *rq = drive->hwif->rq;
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unsigned long wait = 0;
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debug_log("%s: rq->cmd[0]: 0x%x\n", __func__, rq->cmd[0]);
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/*
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* Some commands are *slow* and normally take a long time to complete.
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* Usually we can use the ATAPI "disconnect" to bypass this, but not all
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* commands/drives support that. Let ide_timer_expiry keep polling us
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* for these.
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*/
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switch (rq->cmd[0]) {
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case GPCMD_BLANK:
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case GPCMD_FORMAT_UNIT:
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case GPCMD_RESERVE_RZONE_TRACK:
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case GPCMD_CLOSE_TRACK:
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case GPCMD_FLUSH_CACHE:
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wait = ATAPI_WAIT_PC;
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break;
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default:
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if (!(rq->cmd_flags & REQ_QUIET))
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printk(KERN_INFO PFX "cmd 0x%x timed out\n",
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rq->cmd[0]);
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wait = 0;
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break;
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}
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return wait;
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}
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EXPORT_SYMBOL_GPL(ide_cd_expiry);
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int ide_cd_get_xferlen(struct request *rq)
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{
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switch (rq->cmd_type) {
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case REQ_TYPE_FS:
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return 32768;
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case REQ_TYPE_SENSE:
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case REQ_TYPE_BLOCK_PC:
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case REQ_TYPE_ATA_PC:
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return blk_rq_bytes(rq);
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default:
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return 0;
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}
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}
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EXPORT_SYMBOL_GPL(ide_cd_get_xferlen);
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void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason)
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{
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struct ide_taskfile tf;
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drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT |
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IDE_VALID_LBAM | IDE_VALID_LBAH);
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*bcount = (tf.lbah << 8) | tf.lbam;
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*ireason = tf.nsect & 3;
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}
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EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason);
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/*
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* Check the contents of the interrupt reason register and attempt to recover if
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* there are problems.
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*
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* Returns:
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* - 0 if everything's ok
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* - 1 if the request has to be terminated.
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*/
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int ide_check_ireason(ide_drive_t *drive, struct request *rq, int len,
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int ireason, int rw)
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{
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ide_hwif_t *hwif = drive->hwif;
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debug_log("ireason: 0x%x, rw: 0x%x\n", ireason, rw);
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if (ireason == (!rw << 1))
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return 0;
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else if (ireason == (rw << 1)) {
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printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n",
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drive->name, __func__);
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if (dev_is_idecd(drive))
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ide_pad_transfer(drive, rw, len);
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} else if (!rw && ireason == ATAPI_COD) {
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if (dev_is_idecd(drive)) {
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/*
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* Some drives (ASUS) seem to tell us that status info
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* is available. Just get it and ignore.
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*/
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(void)hwif->tp_ops->read_status(hwif);
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return 0;
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}
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} else {
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if (ireason & ATAPI_COD)
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printk(KERN_ERR PFX "%s: CoD != 0 in %s\n", drive->name,
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__func__);
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/* drive wants a command packet, or invalid ireason... */
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printk(KERN_ERR PFX "%s: %s: bad interrupt reason 0x%02x\n",
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drive->name, __func__, ireason);
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}
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if (dev_is_idecd(drive) && rq->cmd_type == REQ_TYPE_ATA_PC)
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rq->cmd_flags |= REQ_FAILED;
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return 1;
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}
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EXPORT_SYMBOL_GPL(ide_check_ireason);
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/*
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* This is the usual interrupt handler which will be called during a packet
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* command. We will transfer some of the data (as requested by the drive)
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* and will re-point interrupt handler to us.
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*/
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static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
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{
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struct ide_atapi_pc *pc = drive->pc;
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ide_hwif_t *hwif = drive->hwif;
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struct ide_cmd *cmd = &hwif->cmd;
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struct request *rq = hwif->rq;
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const struct ide_tp_ops *tp_ops = hwif->tp_ops;
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unsigned int timeout, done;
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u16 bcount;
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u8 stat, ireason, dsc = 0;
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u8 write = !!(pc->flags & PC_FLAG_WRITING);
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debug_log("Enter %s - interrupt handler\n", __func__);
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timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
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: WAIT_TAPE_CMD;
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/* Clear the interrupt */
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stat = tp_ops->read_status(hwif);
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if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
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int rc;
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drive->waiting_for_dma = 0;
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rc = hwif->dma_ops->dma_end(drive);
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ide_dma_unmap_sg(drive, cmd);
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if (rc || (drive->media == ide_tape && (stat & ATA_ERR))) {
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if (drive->media == ide_floppy)
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printk(KERN_ERR PFX "%s: DMA %s error\n",
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drive->name, rq_data_dir(pc->rq)
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? "write" : "read");
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pc->flags |= PC_FLAG_DMA_ERROR;
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} else
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rq->resid_len = 0;
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debug_log("%s: DMA finished\n", drive->name);
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}
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/* No more interrupts */
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if ((stat & ATA_DRQ) == 0) {
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int uptodate, error;
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debug_log("Packet command completed, %d bytes transferred\n",
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blk_rq_bytes(rq));
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pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
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local_irq_enable_in_hardirq();
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if (drive->media == ide_tape &&
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(stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
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stat &= ~ATA_ERR;
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if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) {
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/* Error detected */
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debug_log("%s: I/O error\n", drive->name);
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if (drive->media != ide_tape)
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pc->rq->errors++;
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if (rq->cmd[0] == REQUEST_SENSE) {
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printk(KERN_ERR PFX "%s: I/O error in request "
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"sense command\n", drive->name);
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return ide_do_reset(drive);
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}
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debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
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/* Retry operation */
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ide_retry_pc(drive);
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/* queued, but not started */
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return ide_stopped;
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}
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pc->error = 0;
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if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
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dsc = 1;
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/*
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* ->pc_callback() might change rq->data_len for
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* residual count, cache total length.
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*/
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done = blk_rq_bytes(rq);
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/* Command finished - Call the callback function */
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uptodate = drive->pc_callback(drive, dsc);
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if (uptodate == 0)
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drive->failed_pc = NULL;
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if (rq->cmd_type == REQ_TYPE_SPECIAL) {
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rq->errors = 0;
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error = 0;
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} else {
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if (rq->cmd_type != REQ_TYPE_FS && uptodate <= 0) {
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if (rq->errors == 0)
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rq->errors = -EIO;
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}
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error = uptodate ? 0 : -EIO;
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}
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ide_complete_rq(drive, error, blk_rq_bytes(rq));
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return ide_stopped;
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}
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if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
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pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
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printk(KERN_ERR PFX "%s: The device wants to issue more "
|
|
"interrupts in DMA mode\n", drive->name);
|
|
ide_dma_off(drive);
|
|
return ide_do_reset(drive);
|
|
}
|
|
|
|
/* Get the number of bytes to transfer on this interrupt. */
|
|
ide_read_bcount_and_ireason(drive, &bcount, &ireason);
|
|
|
|
if (ide_check_ireason(drive, rq, bcount, ireason, write))
|
|
return ide_do_reset(drive);
|
|
|
|
done = min_t(unsigned int, bcount, cmd->nleft);
|
|
ide_pio_bytes(drive, cmd, write, done);
|
|
|
|
/* Update transferred byte count */
|
|
rq->resid_len -= done;
|
|
|
|
bcount -= done;
|
|
|
|
if (bcount)
|
|
ide_pad_transfer(drive, write, bcount);
|
|
|
|
debug_log("[cmd %x] transferred %d bytes, padded %d bytes, resid: %u\n",
|
|
rq->cmd[0], done, bcount, rq->resid_len);
|
|
|
|
/* And set the interrupt handler again */
|
|
ide_set_handler(drive, ide_pc_intr, timeout);
|
|
return ide_started;
|
|
}
|
|
|
|
static void ide_init_packet_cmd(struct ide_cmd *cmd, u8 valid_tf,
|
|
u16 bcount, u8 dma)
|
|
{
|
|
cmd->protocol = dma ? ATAPI_PROT_DMA : ATAPI_PROT_PIO;
|
|
cmd->valid.out.tf = IDE_VALID_LBAH | IDE_VALID_LBAM |
|
|
IDE_VALID_FEATURE | valid_tf;
|
|
cmd->tf.command = ATA_CMD_PACKET;
|
|
cmd->tf.feature = dma; /* Use PIO/DMA */
|
|
cmd->tf.lbam = bcount & 0xff;
|
|
cmd->tf.lbah = (bcount >> 8) & 0xff;
|
|
}
|
|
|
|
static u8 ide_read_ireason(ide_drive_t *drive)
|
|
{
|
|
struct ide_taskfile tf;
|
|
|
|
drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT);
|
|
|
|
return tf.nsect & 3;
|
|
}
|
|
|
|
static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
|
|
{
|
|
int retries = 100;
|
|
|
|
while (retries-- && ((ireason & ATAPI_COD) == 0 ||
|
|
(ireason & ATAPI_IO))) {
|
|
printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing "
|
|
"a packet command, retrying\n", drive->name);
|
|
udelay(100);
|
|
ireason = ide_read_ireason(drive);
|
|
if (retries == 0) {
|
|
printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing"
|
|
" a packet command, ignoring\n",
|
|
drive->name);
|
|
ireason |= ATAPI_COD;
|
|
ireason &= ~ATAPI_IO;
|
|
}
|
|
}
|
|
|
|
return ireason;
|
|
}
|
|
|
|
static int ide_delayed_transfer_pc(ide_drive_t *drive)
|
|
{
|
|
/* Send the actual packet */
|
|
drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12);
|
|
|
|
/* Timeout for the packet command */
|
|
return WAIT_FLOPPY_CMD;
|
|
}
|
|
|
|
static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
|
|
{
|
|
struct ide_atapi_pc *uninitialized_var(pc);
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
struct request *rq = hwif->rq;
|
|
ide_expiry_t *expiry;
|
|
unsigned int timeout;
|
|
int cmd_len;
|
|
ide_startstop_t startstop;
|
|
u8 ireason;
|
|
|
|
if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
|
|
printk(KERN_ERR PFX "%s: Strange, packet command initiated yet "
|
|
"DRQ isn't asserted\n", drive->name);
|
|
return startstop;
|
|
}
|
|
|
|
if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
|
|
if (drive->dma)
|
|
drive->waiting_for_dma = 1;
|
|
}
|
|
|
|
if (dev_is_idecd(drive)) {
|
|
/* ATAPI commands get padded out to 12 bytes minimum */
|
|
cmd_len = COMMAND_SIZE(rq->cmd[0]);
|
|
if (cmd_len < ATAPI_MIN_CDB_BYTES)
|
|
cmd_len = ATAPI_MIN_CDB_BYTES;
|
|
|
|
timeout = rq->timeout;
|
|
expiry = ide_cd_expiry;
|
|
} else {
|
|
pc = drive->pc;
|
|
|
|
cmd_len = ATAPI_MIN_CDB_BYTES;
|
|
|
|
/*
|
|
* If necessary schedule the packet transfer to occur 'timeout'
|
|
* milliseconds later in ide_delayed_transfer_pc() after the
|
|
* device says it's ready for a packet.
|
|
*/
|
|
if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
|
|
timeout = drive->pc_delay;
|
|
expiry = &ide_delayed_transfer_pc;
|
|
} else {
|
|
timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
|
|
: WAIT_TAPE_CMD;
|
|
expiry = NULL;
|
|
}
|
|
|
|
ireason = ide_read_ireason(drive);
|
|
if (drive->media == ide_tape)
|
|
ireason = ide_wait_ireason(drive, ireason);
|
|
|
|
if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) {
|
|
printk(KERN_ERR PFX "%s: (IO,CoD) != (0,1) while "
|
|
"issuing a packet command\n", drive->name);
|
|
|
|
return ide_do_reset(drive);
|
|
}
|
|
}
|
|
|
|
hwif->expiry = expiry;
|
|
|
|
/* Set the interrupt routine */
|
|
ide_set_handler(drive,
|
|
(dev_is_idecd(drive) ? drive->irq_handler
|
|
: ide_pc_intr),
|
|
timeout);
|
|
|
|
/* Send the actual packet */
|
|
if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
|
|
hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
|
|
|
|
/* Begin DMA, if necessary */
|
|
if (dev_is_idecd(drive)) {
|
|
if (drive->dma)
|
|
hwif->dma_ops->dma_start(drive);
|
|
} else {
|
|
if (pc->flags & PC_FLAG_DMA_OK) {
|
|
pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
|
|
hwif->dma_ops->dma_start(drive);
|
|
}
|
|
}
|
|
|
|
return ide_started;
|
|
}
|
|
|
|
ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
|
|
{
|
|
struct ide_atapi_pc *pc;
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
ide_expiry_t *expiry = NULL;
|
|
struct request *rq = hwif->rq;
|
|
unsigned int timeout, bytes;
|
|
u16 bcount;
|
|
u8 valid_tf;
|
|
u8 drq_int = !!(drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT);
|
|
|
|
if (dev_is_idecd(drive)) {
|
|
valid_tf = IDE_VALID_NSECT | IDE_VALID_LBAL;
|
|
bcount = ide_cd_get_xferlen(rq);
|
|
expiry = ide_cd_expiry;
|
|
timeout = ATAPI_WAIT_PC;
|
|
|
|
if (drive->dma)
|
|
drive->dma = !ide_dma_prepare(drive, cmd);
|
|
} else {
|
|
pc = drive->pc;
|
|
|
|
valid_tf = IDE_VALID_DEVICE;
|
|
bytes = blk_rq_bytes(rq);
|
|
bcount = ((drive->media == ide_tape) ? bytes
|
|
: min_t(unsigned int,
|
|
bytes, 63 * 1024));
|
|
|
|
/* We haven't transferred any data yet */
|
|
rq->resid_len = bcount;
|
|
|
|
if (pc->flags & PC_FLAG_DMA_ERROR) {
|
|
pc->flags &= ~PC_FLAG_DMA_ERROR;
|
|
ide_dma_off(drive);
|
|
}
|
|
|
|
if (pc->flags & PC_FLAG_DMA_OK)
|
|
drive->dma = !ide_dma_prepare(drive, cmd);
|
|
|
|
if (!drive->dma)
|
|
pc->flags &= ~PC_FLAG_DMA_OK;
|
|
|
|
timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
|
|
: WAIT_TAPE_CMD;
|
|
}
|
|
|
|
ide_init_packet_cmd(cmd, valid_tf, bcount, drive->dma);
|
|
|
|
(void)do_rw_taskfile(drive, cmd);
|
|
|
|
if (drq_int) {
|
|
if (drive->dma)
|
|
drive->waiting_for_dma = 0;
|
|
hwif->expiry = expiry;
|
|
}
|
|
|
|
ide_execute_command(drive, cmd, ide_transfer_pc, timeout);
|
|
|
|
return drq_int ? ide_started : ide_transfer_pc(drive);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ide_issue_pc);
|