diff options
Diffstat (limited to 'drivers/ide/ide-atapi.c')
| -rw-r--r-- | drivers/ide/ide-atapi.c | 756 |
1 files changed, 0 insertions, 756 deletions
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c deleted file mode 100644 index a1ce9f5ac3aa..000000000000 --- a/drivers/ide/ide-atapi.c +++ /dev/null @@ -1,756 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * ATAPI support. - */ - -#include <linux/kernel.h> -#include <linux/cdrom.h> -#include <linux/delay.h> -#include <linux/export.h> -#include <linux/ide.h> -#include <linux/scatterlist.h> -#include <linux/gfp.h> - -#include <scsi/scsi.h> - -#define DRV_NAME "ide-atapi" -#define PFX DRV_NAME ": " - -#ifdef DEBUG -#define debug_log(fmt, args...) \ - printk(KERN_INFO "ide: " fmt, ## args) -#else -#define debug_log(fmt, args...) do {} while (0) -#endif - -#define ATAPI_MIN_CDB_BYTES 12 - -static inline int dev_is_idecd(ide_drive_t *drive) -{ - return drive->media == ide_cdrom || drive->media == ide_optical; -} - -/* - * Check whether we can support a device, - * based on the ATAPI IDENTIFY command results. - */ -int ide_check_atapi_device(ide_drive_t *drive, const char *s) -{ - u16 *id = drive->id; - u8 gcw[2], protocol, device_type, removable, drq_type, packet_size; - - *((u16 *)&gcw) = id[ATA_ID_CONFIG]; - - protocol = (gcw[1] & 0xC0) >> 6; - device_type = gcw[1] & 0x1F; - removable = (gcw[0] & 0x80) >> 7; - drq_type = (gcw[0] & 0x60) >> 5; - packet_size = gcw[0] & 0x03; - -#ifdef CONFIG_PPC - /* kludge for Apple PowerBook internal zip */ - if (drive->media == ide_floppy && device_type == 5 && - !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") && - strstr((char *)&id[ATA_ID_PROD], "ZIP")) - device_type = 0; -#endif - - if (protocol != 2) - printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n", - s, drive->name, protocol); - else if ((drive->media == ide_floppy && device_type != 0) || - (drive->media == ide_tape && device_type != 1)) - printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n", - s, drive->name, device_type); - else if (removable == 0) - printk(KERN_ERR "%s: %s: the removable flag is not set\n", - s, drive->name); - else if (drive->media == ide_floppy && drq_type == 3) - printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not " - "supported\n", s, drive->name, drq_type); - else if (packet_size != 0) - printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 " - "bytes\n", s, drive->name, packet_size); - else - return 1; - return 0; -} -EXPORT_SYMBOL_GPL(ide_check_atapi_device); - -void ide_init_pc(struct ide_atapi_pc *pc) -{ - memset(pc, 0, sizeof(*pc)); -} -EXPORT_SYMBOL_GPL(ide_init_pc); - -/* - * Add a special packet command request to the tail of the request queue, - * and wait for it to be serviced. - */ -int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk, - struct ide_atapi_pc *pc, void *buf, unsigned int bufflen) -{ - struct request *rq; - int error; - - rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, 0); - ide_req(rq)->type = ATA_PRIV_MISC; - ide_req(rq)->special = pc; - - if (buf && bufflen) { - error = blk_rq_map_kern(drive->queue, rq, buf, bufflen, - GFP_NOIO); - if (error) - goto put_req; - } - - memcpy(scsi_req(rq)->cmd, pc->c, 12); - if (drive->media == ide_tape) - scsi_req(rq)->cmd[13] = REQ_IDETAPE_PC1; - blk_execute_rq(disk, rq, 0); - error = scsi_req(rq)->result ? -EIO : 0; -put_req: - blk_put_request(rq); - return error; -} -EXPORT_SYMBOL_GPL(ide_queue_pc_tail); - -int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk) -{ - struct ide_atapi_pc pc; - - ide_init_pc(&pc); - pc.c[0] = TEST_UNIT_READY; - - return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); -} -EXPORT_SYMBOL_GPL(ide_do_test_unit_ready); - -int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start) -{ - struct ide_atapi_pc pc; - - ide_init_pc(&pc); - pc.c[0] = START_STOP; - pc.c[4] = start; - - if (drive->media == ide_tape) - pc.flags |= PC_FLAG_WAIT_FOR_DSC; - - return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); -} -EXPORT_SYMBOL_GPL(ide_do_start_stop); - -int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on) -{ - struct ide_atapi_pc pc; - - if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0) - return 0; - - ide_init_pc(&pc); - pc.c[0] = ALLOW_MEDIUM_REMOVAL; - pc.c[4] = on; - - return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); -} -EXPORT_SYMBOL_GPL(ide_set_media_lock); - -void ide_create_request_sense_cmd(ide_drive_t *drive, struct ide_atapi_pc *pc) -{ - ide_init_pc(pc); - pc->c[0] = REQUEST_SENSE; - if (drive->media == ide_floppy) { - pc->c[4] = 255; - pc->req_xfer = 18; - } else { - pc->c[4] = 20; - pc->req_xfer = 20; - } -} -EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd); - -void ide_prep_sense(ide_drive_t *drive, struct request *rq) -{ - struct request_sense *sense = &drive->sense_data; - struct request *sense_rq; - struct scsi_request *req; - unsigned int cmd_len, sense_len; - int err; - - switch (drive->media) { - case ide_floppy: - cmd_len = 255; - sense_len = 18; - break; - case ide_tape: - cmd_len = 20; - sense_len = 20; - break; - default: - cmd_len = 18; - sense_len = 18; - } - - BUG_ON(sense_len > sizeof(*sense)); - - if (ata_sense_request(rq) || drive->sense_rq_armed) - return; - - sense_rq = drive->sense_rq; - if (!sense_rq) { - sense_rq = blk_mq_alloc_request(drive->queue, REQ_OP_DRV_IN, - BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT); - drive->sense_rq = sense_rq; - } - req = scsi_req(sense_rq); - - memset(sense, 0, sizeof(*sense)); - - scsi_req_init(req); - - err = blk_rq_map_kern(drive->queue, sense_rq, sense, sense_len, - GFP_NOIO); - if (unlikely(err)) { - if (printk_ratelimit()) - printk(KERN_WARNING PFX "%s: failed to map sense " - "buffer\n", drive->name); - blk_mq_free_request(sense_rq); - drive->sense_rq = NULL; - return; - } - - sense_rq->rq_disk = rq->rq_disk; - sense_rq->cmd_flags = REQ_OP_DRV_IN; - ide_req(sense_rq)->type = ATA_PRIV_SENSE; - - req->cmd[0] = GPCMD_REQUEST_SENSE; - req->cmd[4] = cmd_len; - if (drive->media == ide_tape) - req->cmd[13] = REQ_IDETAPE_PC1; - - drive->sense_rq_armed = true; -} -EXPORT_SYMBOL_GPL(ide_prep_sense); - -int ide_queue_sense_rq(ide_drive_t *drive, void *special) -{ - ide_hwif_t *hwif = drive->hwif; - struct request *sense_rq; - unsigned long flags; - - spin_lock_irqsave(&hwif->lock, flags); - - /* deferred failure from ide_prep_sense() */ - if (!drive->sense_rq_armed) { - printk(KERN_WARNING PFX "%s: error queuing a sense request\n", - drive->name); - spin_unlock_irqrestore(&hwif->lock, flags); - return -ENOMEM; - } - - sense_rq = drive->sense_rq; - ide_req(sense_rq)->special = special; - drive->sense_rq_armed = false; - - drive->hwif->rq = NULL; - - ide_insert_request_head(drive, sense_rq); - spin_unlock_irqrestore(&hwif->lock, flags); - return 0; -} -EXPORT_SYMBOL_GPL(ide_queue_sense_rq); - -/* - * Called when an error was detected during the last packet command. - * We queue a request sense packet command at the head of the request - * queue. - */ -void ide_retry_pc(ide_drive_t *drive) -{ - struct request *failed_rq = drive->hwif->rq; - struct request *sense_rq = drive->sense_rq; - struct ide_atapi_pc *pc = &drive->request_sense_pc; - - (void)ide_read_error(drive); - - /* init pc from sense_rq */ - ide_init_pc(pc); - memcpy(pc->c, scsi_req(sense_rq)->cmd, 12); - - if (drive->media == ide_tape) - drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; - - /* - * Push back the failed request and put request sense on top - * of it. The failed command will be retried after sense data - * is acquired. - */ - drive->hwif->rq = NULL; - ide_requeue_and_plug(drive, failed_rq); - if (ide_queue_sense_rq(drive, pc)) - ide_complete_rq(drive, BLK_STS_IOERR, blk_rq_bytes(failed_rq)); -} -EXPORT_SYMBOL_GPL(ide_retry_pc); - -int ide_cd_expiry(ide_drive_t *drive) -{ - struct request *rq = drive->hwif->rq; - unsigned long wait = 0; - - debug_log("%s: scsi_req(rq)->cmd[0]: 0x%x\n", __func__, scsi_req(rq)->cmd[0]); - - /* - * Some commands are *slow* and normally take a long time to complete. - * Usually we can use the ATAPI "disconnect" to bypass this, but not all - * commands/drives support that. Let ide_timer_expiry keep polling us - * for these. - */ - switch (scsi_req(rq)->cmd[0]) { - case GPCMD_BLANK: - case GPCMD_FORMAT_UNIT: - case GPCMD_RESERVE_RZONE_TRACK: - case GPCMD_CLOSE_TRACK: - case GPCMD_FLUSH_CACHE: - wait = ATAPI_WAIT_PC; - break; - default: - if (!(rq->rq_flags & RQF_QUIET)) - printk(KERN_INFO PFX "cmd 0x%x timed out\n", - scsi_req(rq)->cmd[0]); - wait = 0; - break; - } - return wait; -} -EXPORT_SYMBOL_GPL(ide_cd_expiry); - -int ide_cd_get_xferlen(struct request *rq) -{ - switch (req_op(rq)) { - default: - return 32768; - case REQ_OP_SCSI_IN: - case REQ_OP_SCSI_OUT: - return blk_rq_bytes(rq); - case REQ_OP_DRV_IN: - case REQ_OP_DRV_OUT: - switch (ide_req(rq)->type) { - case ATA_PRIV_PC: - case ATA_PRIV_SENSE: - return blk_rq_bytes(rq); - default: - return 0; - } - } -} -EXPORT_SYMBOL_GPL(ide_cd_get_xferlen); - -void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason) -{ - struct ide_taskfile tf; - - drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT | - IDE_VALID_LBAM | IDE_VALID_LBAH); - - *bcount = (tf.lbah << 8) | tf.lbam; - *ireason = tf.nsect & 3; -} -EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason); - -/* - * Check the contents of the interrupt reason register and attempt to recover if - * there are problems. - * - * Returns: - * - 0 if everything's ok - * - 1 if the request has to be terminated. - */ -int ide_check_ireason(ide_drive_t *drive, struct request *rq, int len, - int ireason, int rw) -{ - ide_hwif_t *hwif = drive->hwif; - - debug_log("ireason: 0x%x, rw: 0x%x\n", ireason, rw); - - if (ireason == (!rw << 1)) - return 0; - else if (ireason == (rw << 1)) { - printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n", - drive->name, __func__); - - if (dev_is_idecd(drive)) - ide_pad_transfer(drive, rw, len); - } else if (!rw && ireason == ATAPI_COD) { - if (dev_is_idecd(drive)) { - /* - * Some drives (ASUS) seem to tell us that status info - * is available. Just get it and ignore. - */ - (void)hwif->tp_ops->read_status(hwif); - return 0; - } - } else { - if (ireason & ATAPI_COD) - printk(KERN_ERR PFX "%s: CoD != 0 in %s\n", drive->name, - __func__); - - /* drive wants a command packet, or invalid ireason... */ - printk(KERN_ERR PFX "%s: %s: bad interrupt reason 0x%02x\n", - drive->name, __func__, ireason); - } - - if (dev_is_idecd(drive) && ata_pc_request(rq)) - rq->rq_flags |= RQF_FAILED; - - return 1; -} -EXPORT_SYMBOL_GPL(ide_check_ireason); - -/* - * This is the usual interrupt handler which will be called during a packet - * command. We will transfer some of the data (as requested by the drive) - * and will re-point interrupt handler to us. - */ -static ide_startstop_t ide_pc_intr(ide_drive_t *drive) -{ - struct ide_atapi_pc *pc = drive->pc; - ide_hwif_t *hwif = drive->hwif; - struct ide_cmd *cmd = &hwif->cmd; - struct request *rq = hwif->rq; - const struct ide_tp_ops *tp_ops = hwif->tp_ops; - unsigned int timeout, done; - u16 bcount; - u8 stat, ireason, dsc = 0; - u8 write = !!(pc->flags & PC_FLAG_WRITING); - - debug_log("Enter %s - interrupt handler\n", __func__); - - timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD - : WAIT_TAPE_CMD; - - /* Clear the interrupt */ - stat = tp_ops->read_status(hwif); - - if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { - int rc; - - drive->waiting_for_dma = 0; - rc = hwif->dma_ops->dma_end(drive); - ide_dma_unmap_sg(drive, cmd); - - if (rc || (drive->media == ide_tape && (stat & ATA_ERR))) { - if (drive->media == ide_floppy) - printk(KERN_ERR PFX "%s: DMA %s error\n", - drive->name, rq_data_dir(pc->rq) - ? "write" : "read"); - pc->flags |= PC_FLAG_DMA_ERROR; - } else - scsi_req(rq)->resid_len = 0; - debug_log("%s: DMA finished\n", drive->name); - } - - /* No more interrupts */ - if ((stat & ATA_DRQ) == 0) { - int uptodate; - blk_status_t error; - - debug_log("Packet command completed, %d bytes transferred\n", - blk_rq_bytes(rq)); - - pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; - - local_irq_enable_in_hardirq(); - - if (drive->media == ide_tape && - (stat & ATA_ERR) && scsi_req(rq)->cmd[0] == REQUEST_SENSE) - stat &= ~ATA_ERR; - - if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) { - /* Error detected */ - debug_log("%s: I/O error\n", drive->name); - - if (drive->media != ide_tape) - scsi_req(pc->rq)->result++; - - if (scsi_req(rq)->cmd[0] == REQUEST_SENSE) { - printk(KERN_ERR PFX "%s: I/O error in request " - "sense command\n", drive->name); - return ide_do_reset(drive); - } - - debug_log("[cmd %x]: check condition\n", scsi_req(rq)->cmd[0]); - - /* Retry operation */ - ide_retry_pc(drive); - - /* queued, but not started */ - return ide_stopped; - } - pc->error = 0; - - if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0) - dsc = 1; - - /* - * ->pc_callback() might change rq->data_len for - * residual count, cache total length. - */ - done = blk_rq_bytes(rq); - - /* Command finished - Call the callback function */ - uptodate = drive->pc_callback(drive, dsc); - - if (uptodate == 0) - drive->failed_pc = NULL; - - if (ata_misc_request(rq)) { - scsi_req(rq)->result = 0; - error = BLK_STS_OK; - } else { - - if (blk_rq_is_passthrough(rq) && uptodate <= 0) { - if (scsi_req(rq)->result == 0) - scsi_req(rq)->result = -EIO; - } - - error = uptodate ? BLK_STS_OK : BLK_STS_IOERR; - } - - ide_complete_rq(drive, error, blk_rq_bytes(rq)); - return ide_stopped; - } - - if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { - pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; - 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 */ - scsi_req(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", - scsi_req(rq)->cmd[0], done, bcount, scsi_req(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 *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(scsi_req(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, scsi_req(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 */ - scsi_req(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); |