[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

static inline int dev_is_idecd(ide_drive_t *drive)
{
	return (drive->media == ide_cdrom || drive->media == ide_optical) &&
		!(drive->dev_flags & IDE_DFLAG_SCSI);
}

/*
 * 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;
	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;
	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_scsi_expiry(ide_drive_t *drive)
{
	struct ide_atapi_pc *pc = drive->pc;

	debug_log("%s called for %lu at %lu\n", __func__,
		  pc->scsi_cmd->serial_number, jiffies);

	pc->flags |= PC_FLAG_TIMEDOUT;

	return 0; /* we do not want the IDE subsystem to retry */
}
EXPORT_SYMBOL_GPL(ide_scsi_expiry);

int ide_cd_expiry(ide_drive_t *drive)
{
	struct request *rq = HWGROUP(drive)->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->hwgroup->rq;
	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
	xfer_func_t *xferfunc;
	ide_expiry_t *expiry;
	unsigned int timeout, temp;
	u16 bcount;
	u8 stat, ireason, scsi = !!(drive->dev_flags & IDE_DFLAG_SCSI), dsc = 0;

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

	if (scsi) {
		timeout = ide_scsi_get_timeout(pc);
		expiry = ide_scsi_expiry;
	} else {
		timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
						       : WAIT_TAPE_CMD;
		expiry = NULL;
	}

	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 && !scsi && (stat & ATA_ERR))) {
			if (drive->media == ide_floppy && !scsi)
				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 && !scsi &&
		    (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 || scsi) {
				pc->rq->errors++;
				if (scsi)
					goto cmd_finished;
			}

			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;
		}
cmd_finished:
		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);
				if (scsi)
					temp = pc->buf_size - pc->xferred;
				else
					temp = 0;
				if (temp) {
					if (pc->sg)
						drive->pc_io_buffers(drive, pc,
								     temp, 0);
					else
						tp_ops->input_data(drive, NULL,
							pc->cur_pos, temp);
					printk(KERN_ERR "%s: transferred %d of "
							"%d bytes\n",
							drive->name,
							temp, bcount);
				}
				pc->xferred += temp;
				pc->cur_pos += temp;
				ide_pad_transfer(drive, 0, bcount - temp);
				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 && !scsi && !pc->buf) ||
	    (drive->media == ide_tape && !scsi && pc->bh) ||
	    (scsi && pc->sg)) {
		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 && !scsi)
			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, expiry);
	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 *pc = drive->pc;
	ide_hwif_t *hwif = drive->hwif;
	struct request *rq = hwif->hwgroup->rq;
	ide_expiry_t *expiry;
	unsigned int timeout;
	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;
	}

	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);
	}

	/*
	 * 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;
	}

	/* Set the interrupt routine */
	ide_set_handler(drive, ide_pc_intr, timeout, expiry);

	/* Begin DMA, if necessary */
	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, 12);

	return ide_started;
}

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

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

	if (dev_is_idecd(drive)) {
		tf_flags = IDE_TFLAG_OUT_NSECT | IDE_TFLAG_OUT_LBAL;
		bcount = ide_cd_get_xferlen(hwif->hwgroup->rq);
		expiry = ide_cd_expiry;
	} else {
		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)
		drive->dma = !hwif->dma_ops->dma_setup(drive);

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

	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
991cb26a BP	18	static inline int dev_is_idecd(ide_drive_t *drive)
	19	{
	20	return (drive->media == ide_cdrom \|\| drive->media == ide_optical) &&
	21	!(drive->dev_flags & IDE_DFLAG_SCSI);
	22	}
	23
51509eec BZ	24	/*
	25	* Check whether we can support a device,
	26	* based on the ATAPI IDENTIFY command results.
	27	*/
	28	int ide_check_atapi_device(ide_drive_t drive, const char s)
	29	{
	30	u16 *id = drive->id;
	31	u8 gcw[2], protocol, device_type, removable, drq_type, packet_size;
	32
	33	((u16 )&gcw) = id[ATA_ID_CONFIG];
	34
	35	protocol = (gcw[1] & 0xC0) >> 6;
	36	device_type = gcw[1] & 0x1F;
	37	removable = (gcw[0] & 0x80) >> 7;
	38	drq_type = (gcw[0] & 0x60) >> 5;
	39	packet_size = gcw[0] & 0x03;
	40
	41	#ifdef CONFIG_PPC
	42	/* kludge for Apple PowerBook internal zip */
	43	if (drive->media == ide_floppy && device_type == 5 &&
	44	!strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&
	45	strstr((char *)&id[ATA_ID_PROD], "ZIP"))
	46	device_type = 0;
	47	#endif
	48
	49	if (protocol != 2)
	50	printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n",
	51	s, drive->name, protocol);
	52	else if ((drive->media == ide_floppy && device_type != 0) \|\|
	53	(drive->media == ide_tape && device_type != 1))
	54	printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n",
	55	s, drive->name, device_type);
	56	else if (removable == 0)
	57	printk(KERN_ERR "%s: %s: the removable flag is not set\n",
	58	s, drive->name);
	59	else if (drive->media == ide_floppy && drq_type == 3)
	60	printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not "
	61	"supported\n", s, drive->name, drq_type);
	62	else if (packet_size != 0)
	63	printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 "
	64	"bytes\n", s, drive->name, packet_size);
	65	else
	66	return 1;
	67	return 0;
	68	}
	69	EXPORT_SYMBOL_GPL(ide_check_atapi_device);
	70
acaa0f5f BZ	71	/* PIO data transfer routine using the scatter gather table. */
	72	int ide_io_buffers(ide_drive_t drive, struct ide_atapi_pc pc,
	73	unsigned int bcount, int write)
	74	{
	75	ide_hwif_t *hwif = drive->hwif;
	76	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
	77	xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
	78	struct scatterlist *sg = pc->sg;
	79	char *buf;
	80	int count, done = 0;
	81
	82	while (bcount) {
	83	count = min(sg->length - pc->b_count, bcount);
	84
	85	if (PageHighMem(sg_page(sg))) {
	86	unsigned long flags;
	87
	88	local_irq_save(flags);
	89	buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
	90	xf(drive, NULL, buf + pc->b_count, count);
	91	kunmap_atomic(buf - sg->offset, KM_IRQ0);
	92	local_irq_restore(flags);
	93	} else {
	94	buf = sg_virt(sg);
	95	xf(drive, NULL, buf + pc->b_count, count);
	96	}
	97
	98	bcount -= count;
	99	pc->b_count += count;
	100	done += count;
	101
	102	if (pc->b_count == sg->length) {
	103	if (!--pc->sg_cnt)
	104	break;
	105	pc->sg = sg = sg_next(sg);
	106	pc->b_count = 0;
	107	}
	108	}
	109
	110	if (bcount) {
	111	printk(KERN_ERR "%s: %d leftover bytes, %s\n", drive->name,
	112	bcount, write ? "padding with zeros"
	113	: "discarding data");
	114	ide_pad_transfer(drive, write, bcount);
	115	}
	116
	117	return done;
	118	}
	119	EXPORT_SYMBOL_GPL(ide_io_buffers);
	120
7bf7420a BZ	121	void ide_init_pc(struct ide_atapi_pc *pc)
	122	{
	123	memset(pc, 0, sizeof(*pc));
	124	pc->buf = pc->pc_buf;
	125	pc->buf_size = IDE_PC_BUFFER_SIZE;
	126	}
	127	EXPORT_SYMBOL_GPL(ide_init_pc);
	128
7645c151 BZ	129	/*
	130	* Generate a new packet command request in front of the request queue, before
	131	* the current request, so that it will be processed immediately, on the next
	132	* pass through the driver.
	133	*/
6b0da28b BZ	134	static void ide_queue_pc_head(ide_drive_t drive, struct gendisk disk,
6b0da28b BZ	135	struct ide_atapi_pc pc, struct request rq)
7645c151 BZ	136	{
	137	blk_rq_init(NULL, rq);
	138	rq->cmd_type = REQ_TYPE_SPECIAL;
	139	rq->cmd_flags \|= REQ_PREEMPT;
	140	rq->buffer = (char *)pc;
	141	rq->rq_disk = disk;
	142	memcpy(rq->cmd, pc->c, 12);
	143	if (drive->media == ide_tape)
	144	rq->cmd[13] = REQ_IDETAPE_PC1;
	145	ide_do_drive_cmd(drive, rq);
	146	}
7645c151	147
2ac07d92 BZ	148	/*
	149	* Add a special packet command request to the tail of the request queue,
	150	* and wait for it to be serviced.
	151	*/
	152	int ide_queue_pc_tail(ide_drive_t drive, struct gendisk disk,
	153	struct ide_atapi_pc *pc)
	154	{
	155	struct request *rq;
	156	int error;
	157
	158	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
	159	rq->cmd_type = REQ_TYPE_SPECIAL;
	160	rq->buffer = (char *)pc;
	161	memcpy(rq->cmd, pc->c, 12);
	162	if (drive->media == ide_tape)
	163	rq->cmd[13] = REQ_IDETAPE_PC1;
	164	error = blk_execute_rq(drive->queue, disk, rq, 0);
	165	blk_put_request(rq);
	166
	167	return error;
	168	}
	169	EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
	170
de699ad5 BZ	171	int ide_do_test_unit_ready(ide_drive_t drive, struct gendisk disk)
	172	{
	173	struct ide_atapi_pc pc;
	174
	175	ide_init_pc(&pc);
	176	pc.c[0] = TEST_UNIT_READY;
	177
	178	return ide_queue_pc_tail(drive, disk, &pc);
	179	}
	180	EXPORT_SYMBOL_GPL(ide_do_test_unit_ready);
	181
0c8a6c7a BZ	182	int ide_do_start_stop(ide_drive_t drive, struct gendisk disk, int start)
	183	{
	184	struct ide_atapi_pc pc;
	185
	186	ide_init_pc(&pc);
	187	pc.c[0] = START_STOP;
	188	pc.c[4] = start;
	189
	190	if (drive->media == ide_tape)
	191	pc.flags \|= PC_FLAG_WAIT_FOR_DSC;
	192
	193	return ide_queue_pc_tail(drive, disk, &pc);
	194	}
	195	EXPORT_SYMBOL_GPL(ide_do_start_stop);
	196
0578042d BZ	197	int ide_set_media_lock(ide_drive_t drive, struct gendisk disk, int on)
	198	{
	199	struct ide_atapi_pc pc;
	200
42619d35	201	if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)
0578042d BZ	202	return 0;
	203
	204	ide_init_pc(&pc);
	205	pc.c[0] = ALLOW_MEDIUM_REMOVAL;
	206	pc.c[4] = on;
	207
	208	return ide_queue_pc_tail(drive, disk, &pc);
	209	}
	210	EXPORT_SYMBOL_GPL(ide_set_media_lock);
	211
6b0da28b BZ	212	void ide_create_request_sense_cmd(ide_drive_t drive, struct ide_atapi_pc pc)
	213	{
	214	ide_init_pc(pc);
	215	pc->c[0] = REQUEST_SENSE;
	216	if (drive->media == ide_floppy) {
	217	pc->c[4] = 255;
	218	pc->req_xfer = 18;
	219	} else {
	220	pc->c[4] = 20;
	221	pc->req_xfer = 20;
	222	}
	223	}
	224	EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd);
	225
	226	/*
	227	* Called when an error was detected during the last packet command.
	228	* We queue a request sense packet command in the head of the request list.
	229	*/
	230	void ide_retry_pc(ide_drive_t drive, struct gendisk disk)
	231	{
	232	struct request *rq = &drive->request_sense_rq;
	233	struct ide_atapi_pc *pc = &drive->request_sense_pc;
	234
	235	(void)ide_read_error(drive);
	236	ide_create_request_sense_cmd(drive, pc);
	237	if (drive->media == ide_tape)
	238	set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
	239	ide_queue_pc_head(drive, disk, pc, rq);
	240	}
	241	EXPORT_SYMBOL_GPL(ide_retry_pc);
	242
844b9468 BZ	243	int ide_scsi_expiry(ide_drive_t *drive)
	244	{
	245	struct ide_atapi_pc *pc = drive->pc;
	246
	247	debug_log("%s called for %lu at %lu\n", __func__,
	248	pc->scsi_cmd->serial_number, jiffies);
	249
	250	pc->flags \|= PC_FLAG_TIMEDOUT;
	251
	252	return 0; /* we do not want the IDE subsystem to retry */
	253	}
	254	EXPORT_SYMBOL_GPL(ide_scsi_expiry);
	255
4cad085e BP	256	int ide_cd_expiry(ide_drive_t *drive)
	257	{
	258	struct request *rq = HWGROUP(drive)->rq;
	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;
8fccf899	309	struct request *rq = hwif->hwgroup->rq;
374e042c	310	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
646c0cb6	311	xfer_func_t *xferfunc;
844b9468 BZ	312	ide_expiry_t *expiry;
844b9468 BZ	313	unsigned int timeout, temp;
646c0cb6	314	u16 bcount;
97100fc8	315	u8 stat, ireason, scsi = !!(drive->dev_flags & IDE_DFLAG_SCSI), dsc = 0;
646c0cb6 BZ	316
	317	debug_log("Enter %s - interrupt handler\n", __func__);
	318
844b9468 BZ	319	if (scsi) {
	320	timeout = ide_scsi_get_timeout(pc);
	321	expiry = ide_scsi_expiry;
	322	} else {
	323	timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
	324	: WAIT_TAPE_CMD;
	325	expiry = NULL;
	326	}
	327
646c0cb6	328	if (pc->flags & PC_FLAG_TIMEDOUT) {
b14c7212	329	drive->pc_callback(drive, 0);
646c0cb6 BZ	330	return ide_stopped;
	331	}
	332
	333	/* Clear the interrupt */
374e042c	334	stat = tp_ops->read_status(hwif);
646c0cb6 BZ	335
	336	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
	337	if (hwif->dma_ops->dma_end(drive) \|\|
3a7d2484	338	(drive->media == ide_tape && !scsi && (stat & ATA_ERR))) {
646c0cb6 BZ	339	if (drive->media == ide_floppy && !scsi)
	340	printk(KERN_ERR "%s: DMA %s error\n",
	341	drive->name, rq_data_dir(pc->rq)
	342	? "write" : "read");
	343	pc->flags \|= PC_FLAG_DMA_ERROR;
	344	} else {
	345	pc->xferred = pc->req_xfer;
85e39035 BZ	346	if (drive->pc_update_buffers)
85e39035 BZ	347	drive->pc_update_buffers(drive, pc);
646c0cb6 BZ	348	}
	349	debug_log("%s: DMA finished\n", drive->name);
	350	}
	351
	352	/* No more interrupts */
3a7d2484	353	if ((stat & ATA_DRQ) == 0) {
646c0cb6 BZ	354	debug_log("Packet command completed, %d bytes transferred\n",
	355	pc->xferred);
	356
	357	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
	358
	359	local_irq_enable_in_hardirq();
	360
	361	if (drive->media == ide_tape && !scsi &&
3a7d2484 BZ	362	(stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
3a7d2484 BZ	363	stat &= ~ATA_ERR;
8fccf899	364
3a7d2484	365	if ((stat & ATA_ERR) \|\| (pc->flags & PC_FLAG_DMA_ERROR)) {
646c0cb6 BZ	366	/* Error detected */
	367	debug_log("%s: I/O error\n", drive->name);
	368
	369	if (drive->media != ide_tape \|\| scsi) {
	370	pc->rq->errors++;
	371	if (scsi)
	372	goto cmd_finished;
	373	}
	374
8fccf899	375	if (rq->cmd[0] == REQUEST_SENSE) {
646c0cb6 BZ	376	printk(KERN_ERR "%s: I/O error in request sense"
	377	" command\n", drive->name);
	378	return ide_do_reset(drive);
	379	}
	380
8fccf899	381	debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
646c0cb6 BZ	382
646c0cb6 BZ	383	/* Retry operation */
6b0da28b	384	ide_retry_pc(drive, rq->rq_disk);
8fccf899	385
646c0cb6 BZ	386	/* queued, but not started */
	387	return ide_stopped;
	388	}
	389	cmd_finished:
	390	pc->error = 0;
b14c7212 BZ	391
	392	if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
	393	dsc = 1;
8fccf899	394
646c0cb6	395	/* Command finished - Call the callback function */
b14c7212	396	drive->pc_callback(drive, dsc);
8fccf899	397
646c0cb6 BZ	398	return ide_stopped;
	399	}
	400
	401	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
	402	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
	403	printk(KERN_ERR "%s: The device wants to issue more interrupts "
	404	"in DMA mode\n", drive->name);
	405	ide_dma_off(drive);
	406	return ide_do_reset(drive);
	407	}
646c0cb6	408
1823649b BZ	409	/* Get the number of bytes to transfer on this interrupt. */
1823649b BZ	410	ide_read_bcount_and_ireason(drive, &bcount, &ireason);
646c0cb6	411
3a7d2484	412	if (ireason & ATAPI_COD) {
646c0cb6 BZ	413	printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
	414	return ide_do_reset(drive);
	415	}
8fccf899	416
3a7d2484 BZ	417	if (((ireason & ATAPI_IO) == ATAPI_IO) ==
3a7d2484 BZ	418	!!(pc->flags & PC_FLAG_WRITING)) {
646c0cb6 BZ	419	/* Hopefully, we will never get here */
	420	printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
	421	"to %s!\n", drive->name,
3a7d2484 BZ	422	(ireason & ATAPI_IO) ? "Write" : "Read",
3a7d2484 BZ	423	(ireason & ATAPI_IO) ? "Read" : "Write");
646c0cb6 BZ	424	return ide_do_reset(drive);
646c0cb6 BZ	425	}
8fccf899	426
646c0cb6 BZ	427	if (!(pc->flags & PC_FLAG_WRITING)) {
	428	/* Reading - Check that we have enough space */
	429	temp = pc->xferred + bcount;
	430	if (temp > pc->req_xfer) {
	431	if (temp > pc->buf_size) {
	432	printk(KERN_ERR "%s: The device wants to send "
	433	"us more data than expected - "
	434	"discarding data\n",
	435	drive->name);
	436	if (scsi)
	437	temp = pc->buf_size - pc->xferred;
	438	else
	439	temp = 0;
	440	if (temp) {
	441	if (pc->sg)
85e39035 BZ	442	drive->pc_io_buffers(drive, pc,
85e39035 BZ	443	temp, 0);
646c0cb6	444	else
374e042c	445	tp_ops->input_data(drive, NULL,
646c0cb6 BZ	446	pc->cur_pos, temp);
	447	printk(KERN_ERR "%s: transferred %d of "
	448	"%d bytes\n",
	449	drive->name,
	450	temp, bcount);
	451	}
	452	pc->xferred += temp;
	453	pc->cur_pos += temp;
	454	ide_pad_transfer(drive, 0, bcount - temp);
844b9468	455	goto next_irq;
646c0cb6 BZ	456	}
	457	debug_log("The device wants to send us more data than "
	458	"expected - allowing transfer\n");
	459	}
374e042c	460	xferfunc = tp_ops->input_data;
646c0cb6	461	} else
374e042c	462	xferfunc = tp_ops->output_data;
646c0cb6 BZ	463
	464	if ((drive->media == ide_floppy && !scsi && !pc->buf) \|\|
	465	(drive->media == ide_tape && !scsi && pc->bh) \|\|
acaa0f5f	466	(scsi && pc->sg)) {
85e39035	467	int done = drive->pc_io_buffers(drive, pc, bcount,
acaa0f5f BZ	468	!!(pc->flags & PC_FLAG_WRITING));
	469
	470	/* FIXME: don't do partial completions */
	471	if (drive->media == ide_floppy && !scsi)
	472	ide_end_request(drive, 1, done >> 9);
	473	} else
646c0cb6 BZ	474	xferfunc(drive, NULL, pc->cur_pos, bcount);
	475
	476	/* Update the current position */
	477	pc->xferred += bcount;
	478	pc->cur_pos += bcount;
	479
	480	debug_log("[cmd %x] transferred %d bytes on that intr.\n",
8fccf899	481	rq->cmd[0], bcount);
844b9468	482	next_irq:
646c0cb6	483	/* And set the interrupt handler again */
aa5d2de7	484	ide_set_handler(drive, ide_pc_intr, timeout, expiry);
646c0cb6 BZ	485	return ide_started;
646c0cb6 BZ	486	}
594c16d8	487
88a72109 BZ	488	static u8 ide_read_ireason(ide_drive_t *drive)
	489	{
	490	ide_task_t task;
	491
	492	memset(&task, 0, sizeof(task));
	493	task.tf_flags = IDE_TFLAG_IN_NSECT;
	494
374e042c	495	drive->hwif->tp_ops->tf_read(drive, &task);
88a72109 BZ	496
	497	return task.tf.nsect & 3;
	498	}
	499
594c16d8 BZ	500	static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
594c16d8 BZ	501	{
594c16d8 BZ	502	int retries = 100;
594c16d8 BZ	503
3a7d2484 BZ	504	while (retries-- && ((ireason & ATAPI_COD) == 0 \|\|
3a7d2484 BZ	505	(ireason & ATAPI_IO))) {
594c16d8 BZ	506	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	507	"a packet command, retrying\n", drive->name);
	508	udelay(100);
88a72109	509	ireason = ide_read_ireason(drive);
594c16d8 BZ	510	if (retries == 0) {
	511	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	512	"a packet command, ignoring\n",
	513	drive->name);
3a7d2484 BZ	514	ireason \|= ATAPI_COD;
3a7d2484 BZ	515	ireason &= ~ATAPI_IO;
594c16d8 BZ	516	}
	517	}
	518
	519	return ireason;
	520	}
	521
baf08f0b BZ	522	static int ide_delayed_transfer_pc(ide_drive_t *drive)
	523	{
	524	/* Send the actual packet */
	525	drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12);
	526
	527	/* Timeout for the packet command */
	528	return WAIT_FLOPPY_CMD;
	529	}
	530
	531	static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
594c16d8	532	{
2b9efba4	533	struct ide_atapi_pc *pc = drive->pc;
594c16d8	534	ide_hwif_t *hwif = drive->hwif;
8fccf899	535	struct request *rq = hwif->hwgroup->rq;
baf08f0b BZ	536	ide_expiry_t *expiry;
baf08f0b BZ	537	unsigned int timeout;
594c16d8 BZ	538	ide_startstop_t startstop;
	539	u8 ireason;
	540
3a7d2484	541	if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
594c16d8 BZ	542	printk(KERN_ERR "%s: Strange, packet command initiated yet "
	543	"DRQ isn't asserted\n", drive->name);
	544	return startstop;
	545	}
	546
5f25843f BP	547	if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
	548	if (drive->dma)
	549	drive->waiting_for_dma = 1;
	550	}
	551
88a72109	552	ireason = ide_read_ireason(drive);
5fe31104	553	if (drive->media == ide_tape)
594c16d8 BZ	554	ireason = ide_wait_ireason(drive, ireason);
594c16d8 BZ	555
3a7d2484	556	if ((ireason & ATAPI_COD) == 0 \|\| (ireason & ATAPI_IO)) {
594c16d8 BZ	557	printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
	558	"a packet command\n", drive->name);
	559	return ide_do_reset(drive);
	560	}
	561
baf08f0b BZ	562	/*
	563	* If necessary schedule the packet transfer to occur 'timeout'
	564	* miliseconds later in ide_delayed_transfer_pc() after the device
	565	* says it's ready for a packet.
	566	*/
	567	if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
	568	timeout = drive->pc_delay;
	569	expiry = &ide_delayed_transfer_pc;
	570	} else {
5fe31104 BP	571	timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
	572	: WAIT_TAPE_CMD;
	573	expiry = NULL;
baf08f0b BZ	574	}
baf08f0b BZ	575
594c16d8	576	/* Set the interrupt routine */
aa5d2de7	577	ide_set_handler(drive, ide_pc_intr, timeout, expiry);
594c16d8 BZ	578
	579	/* Begin DMA, if necessary */
	580	if (pc->flags & PC_FLAG_DMA_OK) {
	581	pc->flags \|= PC_FLAG_DMA_IN_PROGRESS;
	582	hwif->dma_ops->dma_start(drive);
	583	}
	584
	585	/* Send the actual packet */
ea68d270	586	if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
8fccf899	587	hwif->tp_ops->output_data(drive, NULL, rq->cmd, 12);
594c16d8 BZ	588
	589	return ide_started;
	590	}
6bf1641c	591
4cad085e	592	ide_startstop_t ide_issue_pc(ide_drive_t *drive, unsigned int timeout)
6bf1641c	593	{
2b9efba4	594	struct ide_atapi_pc *pc = drive->pc;
6bf1641c	595	ide_hwif_t *hwif = drive->hwif;
4cad085e	596	ide_expiry_t *expiry = NULL;
f9476b96	597	u32 tf_flags;
392de1d5	598	u16 bcount;
6bf1641c BZ	599
	600	/* We haven't transferred any data yet */
	601	pc->xferred = 0;
	602	pc->cur_pos = pc->buf;
	603
ed48554f BP	604	if (dev_is_idecd(drive)) {
ed48554f BP	605	tf_flags = IDE_TFLAG_OUT_NSECT \| IDE_TFLAG_OUT_LBAL;
392de1d5	606	bcount = ide_cd_get_xferlen(hwif->hwgroup->rq);
4cad085e	607	expiry = ide_cd_expiry;
ed48554f BP	608	} else {
	609	tf_flags = IDE_TFLAG_OUT_DEVICE;
	610	bcount = ((drive->media == ide_tape) ?
	611	pc->req_xfer :
	612	min(pc->req_xfer, 63 * 1024));
	613	}
6bf1641c BZ	614
	615	if (pc->flags & PC_FLAG_DMA_ERROR) {
	616	pc->flags &= ~PC_FLAG_DMA_ERROR;
	617	ide_dma_off(drive);
	618	}
	619
4f02ff06 BP	620	if (((pc->flags & PC_FLAG_DMA_OK) &&
4f02ff06 BP	621	(drive->dev_flags & IDE_DFLAG_USING_DMA)) \|\|
152fe1cc	622	drive->dma)
0a9b6f88	623	drive->dma = !hwif->dma_ops->dma_setup(drive);
6bf1641c	624
0a9b6f88	625	if (!drive->dma)
6bf1641c BZ	626	pc->flags &= ~PC_FLAG_DMA_OK;
6bf1641c BZ	627
f9476b96	628	ide_pktcmd_tf_load(drive, tf_flags, bcount, drive->dma);
6bf1641c BZ	629
6bf1641c BZ	630	/* Issue the packet command */
ac77ef8b	631	if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
5f25843f BP	632	if (drive->dma)
5f25843f BP	633	drive->waiting_for_dma = 0;
baf08f0b	634	ide_execute_command(drive, ATA_CMD_PACKET, ide_transfer_pc,
4cad085e	635	timeout, expiry);
6bf1641c BZ	636	return ide_started;
	637	} else {
	638	ide_execute_pkt_cmd(drive);
baf08f0b	639	return ide_transfer_pc(drive);
6bf1641c BZ	640	}
	641	}
	642	EXPORT_SYMBOL_GPL(ide_issue_pc);