[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / drivers / ide / ide-atapi.c

/*
 * ATAPI support.
 */

#include <linux/kernel.h>
#include <linux/cdrom.h>
#include <linux/delay.h>
#include <linux/ide.h>
#include <scsi/scsi.h>

#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);

/* PIO data transfer routine using the scatter gather table. */
int ide_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
		    unsigned int bcount, int write)
{
	ide_hwif_t *hwif = drive->hwif;
	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
	xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
	struct scatterlist *sg = pc->sg;
	char *buf;
	int count, done = 0;

	while (bcount) {
		count = min(sg->length - pc->b_count, bcount);

		if (PageHighMem(sg_page(sg))) {
			unsigned long flags;

			local_irq_save(flags);
			buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
			xf(drive, NULL, buf + pc->b_count, count);
			kunmap_atomic(buf - sg->offset, KM_IRQ0);
			local_irq_restore(flags);
		} else {
			buf = sg_virt(sg);
			xf(drive, NULL, buf + pc->b_count, count);
		}

		bcount -= count;
		pc->b_count += count;
		done += count;

		if (pc->b_count == sg->length) {
			if (!--pc->sg_cnt)
				break;
			pc->sg = sg = sg_next(sg);
			pc->b_count = 0;
		}
	}

	if (bcount) {
		printk(KERN_ERR "%s: %d leftover bytes, %s\n", drive->name,
			bcount, write ? "padding with zeros"
				      : "discarding data");
		ide_pad_transfer(drive, write, bcount);
	}

	return done;
}
EXPORT_SYMBOL_GPL(ide_io_buffers);

void ide_init_pc(struct ide_atapi_pc *pc)
{
	memset(pc, 0, sizeof(*pc));
	pc->buf = pc->pc_buf;
	pc->buf_size = IDE_PC_BUFFER_SIZE;
}
EXPORT_SYMBOL_GPL(ide_init_pc);

/*
 * Generate a new packet command request in front of the request queue, before
 * the current request, so that it will be processed immediately, on the next
 * pass through the driver.
 */
static void ide_queue_pc_head(ide_drive_t *drive, struct gendisk *disk,
			      struct ide_atapi_pc *pc, struct request *rq)
{
	blk_rq_init(NULL, rq);
	rq->cmd_type = REQ_TYPE_SPECIAL;
	rq->cmd_flags |= REQ_PREEMPT;
	rq->buffer = (char *)pc;
	rq->rq_disk = disk;

	if (pc->req_xfer) {
		rq->data = pc->buf;
		rq->data_len = pc->req_xfer;
	}

	memcpy(rq->cmd, pc->c, 12);
	if (drive->media == ide_tape)
		rq->cmd[13] = REQ_IDETAPE_PC1;
	ide_do_drive_cmd(drive, rq);
}

/*
 * 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)
{
	struct request *rq;
	int error;

	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
	rq->cmd_type = REQ_TYPE_SPECIAL;
	rq->buffer = (char *)pc;

	if (pc->req_xfer) {
		rq->data = pc->buf;
		rq->data_len = pc->req_xfer;
	}

	memcpy(rq->cmd, pc->c, 12);
	if (drive->media == ide_tape)
		rq->cmd[13] = REQ_IDETAPE_PC1;
	error = blk_execute_rq(drive->queue, disk, rq, 0);
	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);
}
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);
}
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);
}
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);

/*
 * Called when an error was detected during the last packet command.
 * We queue a request sense packet command in the head of the request list.
 */
void ide_retry_pc(ide_drive_t *drive, struct gendisk *disk)
{
	struct request *rq = &drive->request_sense_rq;
	struct ide_atapi_pc *pc = &drive->request_sense_pc;

	(void)ide_read_error(drive);
	ide_create_request_sense_cmd(drive, pc);
	if (drive->media == ide_tape)
		set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
	ide_queue_pc_head(drive, disk, pc, 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: rq->cmd[0]: 0x%x\n", __func__, 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 (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->cmd_flags & REQ_QUIET))
			printk(KERN_INFO "cmd 0x%x timed out\n",
					 rq->cmd[0]);
		wait = 0;
		break;
	}
	return wait;
}
EXPORT_SYMBOL_GPL(ide_cd_expiry);

int ide_cd_get_xferlen(struct request *rq)
{
	if (blk_fs_request(rq))
		return 32768;
	else if (blk_sense_request(rq) || blk_pc_request(rq) ||
			 rq->cmd_type == REQ_TYPE_ATA_PC)
		return rq->data_len;
	else
		return 0;
}
EXPORT_SYMBOL_GPL(ide_cd_get_xferlen);

/*
 * 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 request *rq = hwif->rq;
	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
	xfer_func_t *xferfunc;
	unsigned int timeout, temp;
	u16 bcount;
	u8 stat, ireason, dsc = 0;

	debug_log("Enter %s - interrupt handler\n", __func__);

	timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
					       : WAIT_TAPE_CMD;

	if (pc->flags & PC_FLAG_TIMEDOUT) {
		drive->pc_callback(drive, 0);
		return ide_stopped;
	}

	/* Clear the interrupt */
	stat = tp_ops->read_status(hwif);

	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
		if (hwif->dma_ops->dma_end(drive) ||
		    (drive->media == ide_tape && (stat & ATA_ERR))) {
			if (drive->media == ide_floppy)
				printk(KERN_ERR "%s: DMA %s error\n",
					drive->name, rq_data_dir(pc->rq)
						     ? "write" : "read");
			pc->flags |= PC_FLAG_DMA_ERROR;
		} else {
			pc->xferred = pc->req_xfer;
			if (drive->pc_update_buffers)
				drive->pc_update_buffers(drive, pc);
		}
		debug_log("%s: DMA finished\n", drive->name);
	}

	/* No more interrupts */
	if ((stat & ATA_DRQ) == 0) {
		debug_log("Packet command completed, %d bytes transferred\n",
			  pc->xferred);

		pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;

		local_irq_enable_in_hardirq();

		if (drive->media == ide_tape &&
		    (stat & ATA_ERR) && 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)
				pc->rq->errors++;

			if (rq->cmd[0] == REQUEST_SENSE) {
				printk(KERN_ERR "%s: I/O error in request sense"
						" command\n", drive->name);
				return ide_do_reset(drive);
			}

			debug_log("[cmd %x]: check condition\n", rq->cmd[0]);

			/* Retry operation */
			ide_retry_pc(drive, rq->rq_disk);

			/* queued, but not started */
			return ide_stopped;
		}
		pc->error = 0;

		if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
			dsc = 1;

		/* Command finished - Call the callback function */
		drive->pc_callback(drive, dsc);

		return ide_stopped;
	}

	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
		pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
		printk(KERN_ERR "%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 (ireason & ATAPI_COD) {
		printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
		return ide_do_reset(drive);
	}

	if (((ireason & ATAPI_IO) == ATAPI_IO) ==
		!!(pc->flags & PC_FLAG_WRITING)) {
		/* Hopefully, we will never get here */
		printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
				"to %s!\n", drive->name,
				(ireason & ATAPI_IO) ? "Write" : "Read",
				(ireason & ATAPI_IO) ? "Read" : "Write");
		return ide_do_reset(drive);
	}

	if (!(pc->flags & PC_FLAG_WRITING)) {
		/* Reading - Check that we have enough space */
		temp = pc->xferred + bcount;
		if (temp > pc->req_xfer) {
			if (temp > pc->buf_size) {
				printk(KERN_ERR "%s: The device wants to send "
						"us more data than expected - "
						"discarding data\n",
						drive->name);

				ide_pad_transfer(drive, 0, bcount);
				goto next_irq;
			}
			debug_log("The device wants to send us more data than "
				  "expected - allowing transfer\n");
		}
		xferfunc = tp_ops->input_data;
	} else
		xferfunc = tp_ops->output_data;

	if ((drive->media == ide_floppy && !pc->buf) ||
	    (drive->media == ide_tape && pc->bh)) {
		int done = drive->pc_io_buffers(drive, pc, bcount,
				  !!(pc->flags & PC_FLAG_WRITING));

		/* FIXME: don't do partial completions */
		if (drive->media == ide_floppy)
			ide_end_request(drive, 1, done >> 9);
	} else
		xferfunc(drive, NULL, pc->cur_pos, bcount);

	/* Update the current position */
	pc->xferred += bcount;
	pc->cur_pos += bcount;

	debug_log("[cmd %x] transferred %d bytes on that intr.\n",
		  rq->cmd[0], bcount);
next_irq:
	/* And set the interrupt handler again */
	ide_set_handler(drive, ide_pc_intr, timeout, NULL);
	return ide_started;
}

static u8 ide_read_ireason(ide_drive_t *drive)
{
	ide_task_t task;

	memset(&task, 0, sizeof(task));
	task.tf_flags = IDE_TFLAG_IN_NSECT;

	drive->hwif->tp_ops->tf_read(drive, &task);

	return task.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 "%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 "%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 "%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'
		 * miliseconds 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 "%s: (IO,CoD) != (0,1) while issuing "
					"a packet command\n", drive->name);

			return ide_do_reset(drive);
		}
	}

	/* Set the interrupt routine */
	ide_set_handler(drive,
			(dev_is_idecd(drive) ? drive->irq_handler
					     : ide_pc_intr),
			timeout, expiry);

	/* 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);
		}
	}

	/* Send the actual packet */
	if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
		hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);

	return ide_started;
}

ide_startstop_t ide_issue_pc(ide_drive_t *drive)
{
	struct ide_atapi_pc *pc;
	ide_hwif_t *hwif = drive->hwif;
	ide_expiry_t *expiry = NULL;
	unsigned int timeout;
	u32 tf_flags;
	u16 bcount;

	if (dev_is_idecd(drive)) {
		tf_flags = IDE_TFLAG_OUT_NSECT | IDE_TFLAG_OUT_LBAL;
		bcount = ide_cd_get_xferlen(hwif->rq);
		expiry = ide_cd_expiry;
		timeout = ATAPI_WAIT_PC;

		if (drive->dma)
			drive->dma = !hwif->dma_ops->dma_setup(drive);
	} else {
		pc = drive->pc;

		/* We haven't transferred any data yet */
		pc->xferred = 0;
		pc->cur_pos = pc->buf;

		tf_flags = IDE_TFLAG_OUT_DEVICE;
		bcount = ((drive->media == ide_tape) ?
				pc->req_xfer :
				min(pc->req_xfer, 63 * 1024));

		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->dev_flags & IDE_DFLAG_USING_DMA))
			drive->dma = !hwif->dma_ops->dma_setup(drive);

		if (!drive->dma)
			pc->flags &= ~PC_FLAG_DMA_OK;

		timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
						       : WAIT_TAPE_CMD;
	}

	ide_pktcmd_tf_load(drive, tf_flags, bcount, drive->dma);

	/* Issue the packet command */
	if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
		if (drive->dma)
			drive->waiting_for_dma = 0;
		ide_execute_command(drive, ATA_CMD_PACKET, ide_transfer_pc,
				    timeout, expiry);
		return ide_started;
	} else {
		ide_execute_pkt_cmd(drive);
		return ide_transfer_pc(drive);
	}
}
EXPORT_SYMBOL_GPL(ide_issue_pc);
Commit	Line	Data
594c16d8 BZ	1	/*
	2	* ATAPI support.
	3	*/
	4
	5	#include <linux/kernel.h>
4cad085e	6	#include <linux/cdrom.h>
594c16d8 BZ	7	#include <linux/delay.h>
594c16d8 BZ	8	#include <linux/ide.h>
646c0cb6 BZ	9	#include <scsi/scsi.h>
	10
	11	#ifdef DEBUG
	12	#define debug_log(fmt, args...) \
	13	printk(KERN_INFO "ide: " fmt, ## args)
	14	#else
	15	#define debug_log(fmt, args...) do {} while (0)
	16	#endif
	17
8c662852 BP	18	#define ATAPI_MIN_CDB_BYTES 12
8c662852 BP	19
991cb26a BP	20	static inline int dev_is_idecd(ide_drive_t *drive)
991cb26a BP	21	{
5317464d	22	return drive->media == ide_cdrom \|\| drive->media == ide_optical;
991cb26a BP	23	}
991cb26a BP	24
51509eec BZ	25	/*
	26	* Check whether we can support a device,
	27	* based on the ATAPI IDENTIFY command results.
	28	*/
	29	int ide_check_atapi_device(ide_drive_t drive, const char s)
	30	{
	31	u16 *id = drive->id;
	32	u8 gcw[2], protocol, device_type, removable, drq_type, packet_size;
	33
	34	((u16 )&gcw) = id[ATA_ID_CONFIG];
	35
	36	protocol = (gcw[1] & 0xC0) >> 6;
	37	device_type = gcw[1] & 0x1F;
	38	removable = (gcw[0] & 0x80) >> 7;
	39	drq_type = (gcw[0] & 0x60) >> 5;
	40	packet_size = gcw[0] & 0x03;
	41
	42	#ifdef CONFIG_PPC
	43	/* kludge for Apple PowerBook internal zip */
	44	if (drive->media == ide_floppy && device_type == 5 &&
	45	!strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&
	46	strstr((char *)&id[ATA_ID_PROD], "ZIP"))
	47	device_type = 0;
	48	#endif
	49
	50	if (protocol != 2)
	51	printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n",
	52	s, drive->name, protocol);
	53	else if ((drive->media == ide_floppy && device_type != 0) \|\|
	54	(drive->media == ide_tape && device_type != 1))
	55	printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n",
	56	s, drive->name, device_type);
	57	else if (removable == 0)
	58	printk(KERN_ERR "%s: %s: the removable flag is not set\n",
	59	s, drive->name);
	60	else if (drive->media == ide_floppy && drq_type == 3)
	61	printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not "
	62	"supported\n", s, drive->name, drq_type);
	63	else if (packet_size != 0)
	64	printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 "
	65	"bytes\n", s, drive->name, packet_size);
	66	else
	67	return 1;
	68	return 0;
	69	}
	70	EXPORT_SYMBOL_GPL(ide_check_atapi_device);
	71
acaa0f5f BZ	72	/* PIO data transfer routine using the scatter gather table. */
	73	int ide_io_buffers(ide_drive_t drive, struct ide_atapi_pc pc,
	74	unsigned int bcount, int write)
	75	{
	76	ide_hwif_t *hwif = drive->hwif;
	77	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
	78	xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
	79	struct scatterlist *sg = pc->sg;
	80	char *buf;
	81	int count, done = 0;
	82
	83	while (bcount) {
	84	count = min(sg->length - pc->b_count, bcount);
	85
	86	if (PageHighMem(sg_page(sg))) {
	87	unsigned long flags;
	88
	89	local_irq_save(flags);
	90	buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
	91	xf(drive, NULL, buf + pc->b_count, count);
	92	kunmap_atomic(buf - sg->offset, KM_IRQ0);
	93	local_irq_restore(flags);
	94	} else {
	95	buf = sg_virt(sg);
	96	xf(drive, NULL, buf + pc->b_count, count);
	97	}
	98
	99	bcount -= count;
	100	pc->b_count += count;
	101	done += count;
	102
	103	if (pc->b_count == sg->length) {
	104	if (!--pc->sg_cnt)
	105	break;
	106	pc->sg = sg = sg_next(sg);
	107	pc->b_count = 0;
	108	}
	109	}
	110
	111	if (bcount) {
	112	printk(KERN_ERR "%s: %d leftover bytes, %s\n", drive->name,
	113	bcount, write ? "padding with zeros"
	114	: "discarding data");
	115	ide_pad_transfer(drive, write, bcount);
	116	}
	117
	118	return done;
	119	}
	120	EXPORT_SYMBOL_GPL(ide_io_buffers);
	121
7bf7420a BZ	122	void ide_init_pc(struct ide_atapi_pc *pc)
	123	{
	124	memset(pc, 0, sizeof(*pc));
	125	pc->buf = pc->pc_buf;
	126	pc->buf_size = IDE_PC_BUFFER_SIZE;
	127	}
	128	EXPORT_SYMBOL_GPL(ide_init_pc);
	129
7645c151 BZ	130	/*
	131	* Generate a new packet command request in front of the request queue, before
	132	* the current request, so that it will be processed immediately, on the next
	133	* pass through the driver.
	134	*/
6b0da28b BZ	135	static void ide_queue_pc_head(ide_drive_t drive, struct gendisk disk,
6b0da28b BZ	136	struct ide_atapi_pc pc, struct request rq)
7645c151 BZ	137	{
	138	blk_rq_init(NULL, rq);
	139	rq->cmd_type = REQ_TYPE_SPECIAL;
	140	rq->cmd_flags \|= REQ_PREEMPT;
	141	rq->buffer = (char *)pc;
	142	rq->rq_disk = disk;
3eb76c1c BP	143
	144	if (pc->req_xfer) {
	145	rq->data = pc->buf;
	146	rq->data_len = pc->req_xfer;
	147	}
	148
7645c151 BZ	149	memcpy(rq->cmd, pc->c, 12);
	150	if (drive->media == ide_tape)
	151	rq->cmd[13] = REQ_IDETAPE_PC1;
	152	ide_do_drive_cmd(drive, rq);
	153	}
7645c151	154
2ac07d92 BZ	155	/*
	156	* Add a special packet command request to the tail of the request queue,
	157	* and wait for it to be serviced.
	158	*/
	159	int ide_queue_pc_tail(ide_drive_t drive, struct gendisk disk,
	160	struct ide_atapi_pc *pc)
	161	{
	162	struct request *rq;
	163	int error;
	164
	165	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
	166	rq->cmd_type = REQ_TYPE_SPECIAL;
	167	rq->buffer = (char *)pc;
3eb76c1c BP	168
	169	if (pc->req_xfer) {
	170	rq->data = pc->buf;
	171	rq->data_len = pc->req_xfer;
	172	}
	173
2ac07d92 BZ	174	memcpy(rq->cmd, pc->c, 12);
	175	if (drive->media == ide_tape)
	176	rq->cmd[13] = REQ_IDETAPE_PC1;
	177	error = blk_execute_rq(drive->queue, disk, rq, 0);
	178	blk_put_request(rq);
	179
	180	return error;
	181	}
	182	EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
	183
de699ad5 BZ	184	int ide_do_test_unit_ready(ide_drive_t drive, struct gendisk disk)
	185	{
	186	struct ide_atapi_pc pc;
	187
	188	ide_init_pc(&pc);
	189	pc.c[0] = TEST_UNIT_READY;
	190
	191	return ide_queue_pc_tail(drive, disk, &pc);
	192	}
	193	EXPORT_SYMBOL_GPL(ide_do_test_unit_ready);
	194
0c8a6c7a BZ	195	int ide_do_start_stop(ide_drive_t drive, struct gendisk disk, int start)
	196	{
	197	struct ide_atapi_pc pc;
	198
	199	ide_init_pc(&pc);
	200	pc.c[0] = START_STOP;
	201	pc.c[4] = start;
	202
	203	if (drive->media == ide_tape)
	204	pc.flags \|= PC_FLAG_WAIT_FOR_DSC;
	205
	206	return ide_queue_pc_tail(drive, disk, &pc);
	207	}
	208	EXPORT_SYMBOL_GPL(ide_do_start_stop);
	209
0578042d BZ	210	int ide_set_media_lock(ide_drive_t drive, struct gendisk disk, int on)
	211	{
	212	struct ide_atapi_pc pc;
	213
42619d35	214	if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)
0578042d BZ	215	return 0;
	216
	217	ide_init_pc(&pc);
	218	pc.c[0] = ALLOW_MEDIUM_REMOVAL;
	219	pc.c[4] = on;
	220
	221	return ide_queue_pc_tail(drive, disk, &pc);
	222	}
	223	EXPORT_SYMBOL_GPL(ide_set_media_lock);
	224
6b0da28b BZ	225	void ide_create_request_sense_cmd(ide_drive_t drive, struct ide_atapi_pc pc)
	226	{
	227	ide_init_pc(pc);
	228	pc->c[0] = REQUEST_SENSE;
	229	if (drive->media == ide_floppy) {
	230	pc->c[4] = 255;
	231	pc->req_xfer = 18;
	232	} else {
	233	pc->c[4] = 20;
	234	pc->req_xfer = 20;
	235	}
	236	}
	237	EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd);
	238
	239	/*
	240	* Called when an error was detected during the last packet command.
	241	* We queue a request sense packet command in the head of the request list.
	242	*/
	243	void ide_retry_pc(ide_drive_t drive, struct gendisk disk)
	244	{
	245	struct request *rq = &drive->request_sense_rq;
	246	struct ide_atapi_pc *pc = &drive->request_sense_pc;
	247
	248	(void)ide_read_error(drive);
	249	ide_create_request_sense_cmd(drive, pc);
	250	if (drive->media == ide_tape)
	251	set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
	252	ide_queue_pc_head(drive, disk, pc, rq);
	253	}
	254	EXPORT_SYMBOL_GPL(ide_retry_pc);
	255
4cad085e BP	256	int ide_cd_expiry(ide_drive_t *drive)
4cad085e BP	257	{
b65fac32	258	struct request *rq = drive->hwif->rq;
4cad085e BP	259	unsigned long wait = 0;
	260
	261	debug_log("%s: rq->cmd[0]: 0x%x\n", __func__, rq->cmd[0]);
	262
	263	/*
	264	* Some commands are slow and normally take a long time to complete.
	265	* Usually we can use the ATAPI "disconnect" to bypass this, but not all
	266	* commands/drives support that. Let ide_timer_expiry keep polling us
	267	* for these.
	268	*/
	269	switch (rq->cmd[0]) {
	270	case GPCMD_BLANK:
	271	case GPCMD_FORMAT_UNIT:
	272	case GPCMD_RESERVE_RZONE_TRACK:
	273	case GPCMD_CLOSE_TRACK:
	274	case GPCMD_FLUSH_CACHE:
	275	wait = ATAPI_WAIT_PC;
	276	break;
	277	default:
	278	if (!(rq->cmd_flags & REQ_QUIET))
	279	printk(KERN_INFO "cmd 0x%x timed out\n",
	280	rq->cmd[0]);
	281	wait = 0;
	282	break;
	283	}
	284	return wait;
	285	}
	286	EXPORT_SYMBOL_GPL(ide_cd_expiry);
	287
392de1d5 BP	288	int ide_cd_get_xferlen(struct request *rq)
	289	{
	290	if (blk_fs_request(rq))
	291	return 32768;
	292	else if (blk_sense_request(rq) \|\| blk_pc_request(rq) \|\|
	293	rq->cmd_type == REQ_TYPE_ATA_PC)
	294	return rq->data_len;
	295	else
	296	return 0;
	297	}
	298	EXPORT_SYMBOL_GPL(ide_cd_get_xferlen);
	299
aa5d2de7 BZ	300	/*
	301	* This is the usual interrupt handler which will be called during a packet
	302	* command. We will transfer some of the data (as requested by the drive)
	303	* and will re-point interrupt handler to us.
	304	*/
	305	static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
646c0cb6	306	{
2b9efba4	307	struct ide_atapi_pc *pc = drive->pc;
646c0cb6	308	ide_hwif_t *hwif = drive->hwif;
b65fac32	309	struct request *rq = hwif->rq;
374e042c	310	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
646c0cb6	311	xfer_func_t *xferfunc;
844b9468	312	unsigned int timeout, temp;
646c0cb6	313	u16 bcount;
5d655a03	314	u8 stat, ireason, dsc = 0;
646c0cb6 BZ	315
	316	debug_log("Enter %s - interrupt handler\n", __func__);
	317
5d655a03 BP	318	timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
5d655a03 BP	319	: WAIT_TAPE_CMD;
844b9468	320
646c0cb6	321	if (pc->flags & PC_FLAG_TIMEDOUT) {
b14c7212	322	drive->pc_callback(drive, 0);
646c0cb6 BZ	323	return ide_stopped;
	324	}
	325
	326	/* Clear the interrupt */
374e042c	327	stat = tp_ops->read_status(hwif);
646c0cb6 BZ	328
	329	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
	330	if (hwif->dma_ops->dma_end(drive) \|\|
5d655a03 BP	331	(drive->media == ide_tape && (stat & ATA_ERR))) {
5d655a03 BP	332	if (drive->media == ide_floppy)
646c0cb6 BZ	333	printk(KERN_ERR "%s: DMA %s error\n",
	334	drive->name, rq_data_dir(pc->rq)
	335	? "write" : "read");
	336	pc->flags \|= PC_FLAG_DMA_ERROR;
	337	} else {
	338	pc->xferred = pc->req_xfer;
85e39035 BZ	339	if (drive->pc_update_buffers)
85e39035 BZ	340	drive->pc_update_buffers(drive, pc);
646c0cb6 BZ	341	}
	342	debug_log("%s: DMA finished\n", drive->name);
	343	}
	344
	345	/* No more interrupts */
3a7d2484	346	if ((stat & ATA_DRQ) == 0) {
646c0cb6 BZ	347	debug_log("Packet command completed, %d bytes transferred\n",
	348	pc->xferred);
	349
	350	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
	351
	352	local_irq_enable_in_hardirq();
	353
5d655a03	354	if (drive->media == ide_tape &&
3a7d2484 BZ	355	(stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
3a7d2484 BZ	356	stat &= ~ATA_ERR;
8fccf899	357
3a7d2484	358	if ((stat & ATA_ERR) \|\| (pc->flags & PC_FLAG_DMA_ERROR)) {
646c0cb6 BZ	359	/* Error detected */
	360	debug_log("%s: I/O error\n", drive->name);
	361
5d655a03	362	if (drive->media != ide_tape)
646c0cb6	363	pc->rq->errors++;
646c0cb6	364
8fccf899	365	if (rq->cmd[0] == REQUEST_SENSE) {
646c0cb6 BZ	366	printk(KERN_ERR "%s: I/O error in request sense"
	367	" command\n", drive->name);
	368	return ide_do_reset(drive);
	369	}
	370
8fccf899	371	debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
646c0cb6 BZ	372
646c0cb6 BZ	373	/* Retry operation */
6b0da28b	374	ide_retry_pc(drive, rq->rq_disk);
8fccf899	375
646c0cb6 BZ	376	/* queued, but not started */
	377	return ide_stopped;
	378	}
646c0cb6	379	pc->error = 0;
b14c7212 BZ	380
	381	if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
	382	dsc = 1;
8fccf899	383
646c0cb6	384	/* Command finished - Call the callback function */
b14c7212	385	drive->pc_callback(drive, dsc);
8fccf899	386
646c0cb6 BZ	387	return ide_stopped;
	388	}
	389
	390	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
	391	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
	392	printk(KERN_ERR "%s: The device wants to issue more interrupts "
	393	"in DMA mode\n", drive->name);
	394	ide_dma_off(drive);
	395	return ide_do_reset(drive);
	396	}
646c0cb6	397
1823649b BZ	398	/* Get the number of bytes to transfer on this interrupt. */
1823649b BZ	399	ide_read_bcount_and_ireason(drive, &bcount, &ireason);
646c0cb6	400
3a7d2484	401	if (ireason & ATAPI_COD) {
646c0cb6 BZ	402	printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
	403	return ide_do_reset(drive);
	404	}
8fccf899	405
3a7d2484 BZ	406	if (((ireason & ATAPI_IO) == ATAPI_IO) ==
3a7d2484 BZ	407	!!(pc->flags & PC_FLAG_WRITING)) {
646c0cb6 BZ	408	/* Hopefully, we will never get here */
	409	printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
	410	"to %s!\n", drive->name,
3a7d2484 BZ	411	(ireason & ATAPI_IO) ? "Write" : "Read",
3a7d2484 BZ	412	(ireason & ATAPI_IO) ? "Read" : "Write");
646c0cb6 BZ	413	return ide_do_reset(drive);
646c0cb6 BZ	414	}
8fccf899	415
646c0cb6 BZ	416	if (!(pc->flags & PC_FLAG_WRITING)) {
	417	/* Reading - Check that we have enough space */
	418	temp = pc->xferred + bcount;
	419	if (temp > pc->req_xfer) {
	420	if (temp > pc->buf_size) {
	421	printk(KERN_ERR "%s: The device wants to send "
	422	"us more data than expected - "
	423	"discarding data\n",
	424	drive->name);
5d655a03 BP	425
5d655a03 BP	426	ide_pad_transfer(drive, 0, bcount);
844b9468	427	goto next_irq;
646c0cb6 BZ	428	}
	429	debug_log("The device wants to send us more data than "
	430	"expected - allowing transfer\n");
	431	}
374e042c	432	xferfunc = tp_ops->input_data;
646c0cb6	433	} else
374e042c	434	xferfunc = tp_ops->output_data;
646c0cb6	435
5d655a03 BP	436	if ((drive->media == ide_floppy && !pc->buf) \|\|
5d655a03 BP	437	(drive->media == ide_tape && pc->bh)) {
85e39035	438	int done = drive->pc_io_buffers(drive, pc, bcount,
acaa0f5f BZ	439	!!(pc->flags & PC_FLAG_WRITING));
	440
	441	/* FIXME: don't do partial completions */
5d655a03	442	if (drive->media == ide_floppy)
acaa0f5f BZ	443	ide_end_request(drive, 1, done >> 9);
acaa0f5f BZ	444	} else
646c0cb6 BZ	445	xferfunc(drive, NULL, pc->cur_pos, bcount);
	446
	447	/* Update the current position */
	448	pc->xferred += bcount;
	449	pc->cur_pos += bcount;
	450
	451	debug_log("[cmd %x] transferred %d bytes on that intr.\n",
8fccf899	452	rq->cmd[0], bcount);
844b9468	453	next_irq:
646c0cb6	454	/* And set the interrupt handler again */
5d655a03	455	ide_set_handler(drive, ide_pc_intr, timeout, NULL);
646c0cb6 BZ	456	return ide_started;
646c0cb6 BZ	457	}
594c16d8	458
88a72109 BZ	459	static u8 ide_read_ireason(ide_drive_t *drive)
	460	{
	461	ide_task_t task;
	462
	463	memset(&task, 0, sizeof(task));
	464	task.tf_flags = IDE_TFLAG_IN_NSECT;
	465
374e042c	466	drive->hwif->tp_ops->tf_read(drive, &task);
88a72109 BZ	467
	468	return task.tf.nsect & 3;
	469	}
	470
594c16d8 BZ	471	static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
594c16d8 BZ	472	{
594c16d8 BZ	473	int retries = 100;
594c16d8 BZ	474
3a7d2484 BZ	475	while (retries-- && ((ireason & ATAPI_COD) == 0 \|\|
3a7d2484 BZ	476	(ireason & ATAPI_IO))) {
594c16d8 BZ	477	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	478	"a packet command, retrying\n", drive->name);
	479	udelay(100);
88a72109	480	ireason = ide_read_ireason(drive);
594c16d8 BZ	481	if (retries == 0) {
	482	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	483	"a packet command, ignoring\n",
	484	drive->name);
3a7d2484 BZ	485	ireason \|= ATAPI_COD;
3a7d2484 BZ	486	ireason &= ~ATAPI_IO;
594c16d8 BZ	487	}
	488	}
	489
	490	return ireason;
	491	}
	492
baf08f0b BZ	493	static int ide_delayed_transfer_pc(ide_drive_t *drive)
	494	{
	495	/* Send the actual packet */
	496	drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12);
	497
	498	/* Timeout for the packet command */
	499	return WAIT_FLOPPY_CMD;
	500	}
	501
	502	static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
594c16d8	503	{
b16aabc9	504	struct ide_atapi_pc *uninitialized_var(pc);
594c16d8	505	ide_hwif_t *hwif = drive->hwif;
b65fac32	506	struct request *rq = hwif->rq;
baf08f0b BZ	507	ide_expiry_t *expiry;
baf08f0b BZ	508	unsigned int timeout;
8c662852	509	int cmd_len;
594c16d8 BZ	510	ide_startstop_t startstop;
	511	u8 ireason;
	512
3a7d2484	513	if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
594c16d8 BZ	514	printk(KERN_ERR "%s: Strange, packet command initiated yet "
	515	"DRQ isn't asserted\n", drive->name);
	516	return startstop;
	517	}
	518
5f25843f BP	519	if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
	520	if (drive->dma)
	521	drive->waiting_for_dma = 1;
	522	}
	523
8c662852 BP	524	if (dev_is_idecd(drive)) {
	525	/* ATAPI commands get padded out to 12 bytes minimum */
	526	cmd_len = COMMAND_SIZE(rq->cmd[0]);
	527	if (cmd_len < ATAPI_MIN_CDB_BYTES)
	528	cmd_len = ATAPI_MIN_CDB_BYTES;
8c662852	529
def860d0 BP	530	timeout = rq->timeout;
def860d0 BP	531	expiry = ide_cd_expiry;
baf08f0b	532	} else {
b16aabc9 BP	533	pc = drive->pc;
b16aabc9 BP	534
def860d0 BP	535	cmd_len = ATAPI_MIN_CDB_BYTES;
	536
	537	/*
	538	* If necessary schedule the packet transfer to occur 'timeout'
	539	* miliseconds later in ide_delayed_transfer_pc() after the
	540	* device says it's ready for a packet.
	541	*/
	542	if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
	543	timeout = drive->pc_delay;
	544	expiry = &ide_delayed_transfer_pc;
	545	} else {
	546	timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
	547	: WAIT_TAPE_CMD;
	548	expiry = NULL;
	549	}
06cc2778 BP	550
	551	ireason = ide_read_ireason(drive);
	552	if (drive->media == ide_tape)
	553	ireason = ide_wait_ireason(drive, ireason);
	554
	555	if ((ireason & ATAPI_COD) == 0 \|\| (ireason & ATAPI_IO)) {
	556	printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
	557	"a packet command\n", drive->name);
	558
	559	return ide_do_reset(drive);
	560	}
baf08f0b BZ	561	}
baf08f0b BZ	562
594c16d8	563	/* Set the interrupt routine */
d6251d44 BP	564	ide_set_handler(drive,
	565	(dev_is_idecd(drive) ? drive->irq_handler
	566	: ide_pc_intr),
	567	timeout, expiry);
594c16d8 BZ	568
594c16d8 BZ	569	/* Begin DMA, if necessary */
b16aabc9 BP	570	if (dev_is_idecd(drive)) {
	571	if (drive->dma)
	572	hwif->dma_ops->dma_start(drive);
	573	} else {
	574	if (pc->flags & PC_FLAG_DMA_OK) {
	575	pc->flags \|= PC_FLAG_DMA_IN_PROGRESS;
	576	hwif->dma_ops->dma_start(drive);
	577	}
594c16d8 BZ	578	}
	579
	580	/* Send the actual packet */
ea68d270	581	if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
8c662852	582	hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
594c16d8 BZ	583
	584	return ide_started;
	585	}
6bf1641c	586
28ad91db	587	ide_startstop_t ide_issue_pc(ide_drive_t *drive)
6bf1641c	588	{
d77612ab	589	struct ide_atapi_pc *pc;
6bf1641c	590	ide_hwif_t *hwif = drive->hwif;
4cad085e	591	ide_expiry_t *expiry = NULL;
28ad91db	592	unsigned int timeout;
f9476b96	593	u32 tf_flags;
392de1d5	594	u16 bcount;
6bf1641c	595
ed48554f BP	596	if (dev_is_idecd(drive)) {
ed48554f BP	597	tf_flags = IDE_TFLAG_OUT_NSECT \| IDE_TFLAG_OUT_LBAL;
b65fac32	598	bcount = ide_cd_get_xferlen(hwif->rq);
4cad085e	599	expiry = ide_cd_expiry;
28ad91db	600	timeout = ATAPI_WAIT_PC;
d77612ab BP	601
	602	if (drive->dma)
	603	drive->dma = !hwif->dma_ops->dma_setup(drive);
ed48554f	604	} else {
d77612ab BP	605	pc = drive->pc;
	606
	607	/* We haven't transferred any data yet */
	608	pc->xferred = 0;
	609	pc->cur_pos = pc->buf;
	610
ed48554f BP	611	tf_flags = IDE_TFLAG_OUT_DEVICE;
	612	bcount = ((drive->media == ide_tape) ?
	613	pc->req_xfer :
	614	min(pc->req_xfer, 63 * 1024));
6bf1641c	615
d77612ab BP	616	if (pc->flags & PC_FLAG_DMA_ERROR) {
	617	pc->flags &= ~PC_FLAG_DMA_ERROR;
	618	ide_dma_off(drive);
	619	}
6bf1641c	620
d77612ab BP	621	if ((pc->flags & PC_FLAG_DMA_OK) &&
	622	(drive->dev_flags & IDE_DFLAG_USING_DMA))
	623	drive->dma = !hwif->dma_ops->dma_setup(drive);
6bf1641c	624
d77612ab BP	625	if (!drive->dma)
d77612ab BP	626	pc->flags &= ~PC_FLAG_DMA_OK;
28ad91db BP	627
	628	timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
	629	: WAIT_TAPE_CMD;
d77612ab	630	}
6bf1641c	631
f9476b96	632	ide_pktcmd_tf_load(drive, tf_flags, bcount, drive->dma);
6bf1641c BZ	633
6bf1641c BZ	634	/* Issue the packet command */
ac77ef8b	635	if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
5f25843f BP	636	if (drive->dma)
5f25843f BP	637	drive->waiting_for_dma = 0;
baf08f0b	638	ide_execute_command(drive, ATA_CMD_PACKET, ide_transfer_pc,
4cad085e	639	timeout, expiry);
6bf1641c BZ	640	return ide_started;
	641	} else {
	642	ide_execute_pkt_cmd(drive);
baf08f0b	643	return ide_transfer_pc(drive);
6bf1641c BZ	644	}
	645	}
	646	EXPORT_SYMBOL_GPL(ide_issue_pc);