[deliverable/linux.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;

	drive->hwif->rq = NULL;

	elv_add_request(drive->queue, rq, ELEVATOR_INSERT_FRONT, 0);
}

/*
 * 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 void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount)
{
	ide_hwif_t *hwif = drive->hwif;
	ide_task_t task;
	u8 dma = drive->dma;

	memset(&task, 0, sizeof(task));
	task.tf_flags = IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM |
			IDE_TFLAG_OUT_FEATURE | tf_flags;
	task.tf.feature = dma;		/* Use PIO/DMA */
	task.tf.lbam    = bcount & 0xff;
	task.tf.lbah    = (bcount >> 8) & 0xff;

	ide_tf_dump(drive->name, &task.tf);
	hwif->tp_ops->set_irq(hwif, 1);
	SELECT_MASK(drive, 0);
	hwif->tp_ops->tf_load(drive, &task);
}

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);

	/* 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;
18660823 BZ	152
	153	drive->hwif->rq = NULL;
	154
	155	elv_add_request(drive->queue, rq, ELEVATOR_INSERT_FRONT, 0);
7645c151	156	}
7645c151	157
2ac07d92 BZ	158	/*
	159	* Add a special packet command request to the tail of the request queue,
	160	* and wait for it to be serviced.
	161	*/
	162	int ide_queue_pc_tail(ide_drive_t drive, struct gendisk disk,
	163	struct ide_atapi_pc *pc)
	164	{
	165	struct request *rq;
	166	int error;
	167
	168	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
	169	rq->cmd_type = REQ_TYPE_SPECIAL;
	170	rq->buffer = (char *)pc;
3eb76c1c BP	171
	172	if (pc->req_xfer) {
	173	rq->data = pc->buf;
	174	rq->data_len = pc->req_xfer;
	175	}
	176
2ac07d92 BZ	177	memcpy(rq->cmd, pc->c, 12);
	178	if (drive->media == ide_tape)
	179	rq->cmd[13] = REQ_IDETAPE_PC1;
	180	error = blk_execute_rq(drive->queue, disk, rq, 0);
	181	blk_put_request(rq);
	182
	183	return error;
	184	}
	185	EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
	186
de699ad5 BZ	187	int ide_do_test_unit_ready(ide_drive_t drive, struct gendisk disk)
	188	{
	189	struct ide_atapi_pc pc;
	190
	191	ide_init_pc(&pc);
	192	pc.c[0] = TEST_UNIT_READY;
	193
	194	return ide_queue_pc_tail(drive, disk, &pc);
	195	}
	196	EXPORT_SYMBOL_GPL(ide_do_test_unit_ready);
	197
0c8a6c7a BZ	198	int ide_do_start_stop(ide_drive_t drive, struct gendisk disk, int start)
	199	{
	200	struct ide_atapi_pc pc;
	201
	202	ide_init_pc(&pc);
	203	pc.c[0] = START_STOP;
	204	pc.c[4] = start;
	205
	206	if (drive->media == ide_tape)
	207	pc.flags \|= PC_FLAG_WAIT_FOR_DSC;
	208
	209	return ide_queue_pc_tail(drive, disk, &pc);
	210	}
	211	EXPORT_SYMBOL_GPL(ide_do_start_stop);
	212
0578042d BZ	213	int ide_set_media_lock(ide_drive_t drive, struct gendisk disk, int on)
	214	{
	215	struct ide_atapi_pc pc;
	216
42619d35	217	if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)
0578042d BZ	218	return 0;
	219
	220	ide_init_pc(&pc);
	221	pc.c[0] = ALLOW_MEDIUM_REMOVAL;
	222	pc.c[4] = on;
	223
	224	return ide_queue_pc_tail(drive, disk, &pc);
	225	}
	226	EXPORT_SYMBOL_GPL(ide_set_media_lock);
	227
6b0da28b BZ	228	void ide_create_request_sense_cmd(ide_drive_t drive, struct ide_atapi_pc pc)
	229	{
	230	ide_init_pc(pc);
	231	pc->c[0] = REQUEST_SENSE;
	232	if (drive->media == ide_floppy) {
	233	pc->c[4] = 255;
	234	pc->req_xfer = 18;
	235	} else {
	236	pc->c[4] = 20;
	237	pc->req_xfer = 20;
	238	}
	239	}
	240	EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd);
	241
	242	/*
	243	* Called when an error was detected during the last packet command.
	244	* We queue a request sense packet command in the head of the request list.
	245	*/
	246	void ide_retry_pc(ide_drive_t drive, struct gendisk disk)
	247	{
	248	struct request *rq = &drive->request_sense_rq;
	249	struct ide_atapi_pc *pc = &drive->request_sense_pc;
	250
	251	(void)ide_read_error(drive);
	252	ide_create_request_sense_cmd(drive, pc);
	253	if (drive->media == ide_tape)
	254	set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
	255	ide_queue_pc_head(drive, disk, pc, rq);
	256	}
	257	EXPORT_SYMBOL_GPL(ide_retry_pc);
	258
4cad085e BP	259	int ide_cd_expiry(ide_drive_t *drive)
4cad085e BP	260	{
b65fac32	261	struct request *rq = drive->hwif->rq;
4cad085e BP	262	unsigned long wait = 0;
	263
	264	debug_log("%s: rq->cmd[0]: 0x%x\n", __func__, rq->cmd[0]);
	265
	266	/*
	267	* Some commands are slow and normally take a long time to complete.
	268	* Usually we can use the ATAPI "disconnect" to bypass this, but not all
	269	* commands/drives support that. Let ide_timer_expiry keep polling us
	270	* for these.
	271	*/
	272	switch (rq->cmd[0]) {
	273	case GPCMD_BLANK:
	274	case GPCMD_FORMAT_UNIT:
	275	case GPCMD_RESERVE_RZONE_TRACK:
	276	case GPCMD_CLOSE_TRACK:
	277	case GPCMD_FLUSH_CACHE:
	278	wait = ATAPI_WAIT_PC;
	279	break;
	280	default:
	281	if (!(rq->cmd_flags & REQ_QUIET))
	282	printk(KERN_INFO "cmd 0x%x timed out\n",
	283	rq->cmd[0]);
	284	wait = 0;
	285	break;
	286	}
	287	return wait;
	288	}
	289	EXPORT_SYMBOL_GPL(ide_cd_expiry);
	290
392de1d5 BP	291	int ide_cd_get_xferlen(struct request *rq)
	292	{
	293	if (blk_fs_request(rq))
	294	return 32768;
	295	else if (blk_sense_request(rq) \|\| blk_pc_request(rq) \|\|
	296	rq->cmd_type == REQ_TYPE_ATA_PC)
	297	return rq->data_len;
	298	else
	299	return 0;
	300	}
	301	EXPORT_SYMBOL_GPL(ide_cd_get_xferlen);
	302
aa5d2de7 BZ	303	/*
	304	* This is the usual interrupt handler which will be called during a packet
	305	* command. We will transfer some of the data (as requested by the drive)
	306	* and will re-point interrupt handler to us.
	307	*/
	308	static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
646c0cb6	309	{
2b9efba4	310	struct ide_atapi_pc *pc = drive->pc;
646c0cb6	311	ide_hwif_t *hwif = drive->hwif;
b65fac32	312	struct request *rq = hwif->rq;
374e042c	313	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
646c0cb6	314	xfer_func_t *xferfunc;
844b9468	315	unsigned int timeout, temp;
646c0cb6	316	u16 bcount;
5d655a03	317	u8 stat, ireason, dsc = 0;
646c0cb6 BZ	318
	319	debug_log("Enter %s - interrupt handler\n", __func__);
	320
5d655a03 BP	321	timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
5d655a03 BP	322	: WAIT_TAPE_CMD;
844b9468	323
646c0cb6	324	if (pc->flags & PC_FLAG_TIMEDOUT) {
b14c7212	325	drive->pc_callback(drive, 0);
646c0cb6 BZ	326	return ide_stopped;
	327	}
	328
	329	/* Clear the interrupt */
374e042c	330	stat = tp_ops->read_status(hwif);
646c0cb6 BZ	331
	332	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
	333	if (hwif->dma_ops->dma_end(drive) \|\|
5d655a03 BP	334	(drive->media == ide_tape && (stat & ATA_ERR))) {
5d655a03 BP	335	if (drive->media == ide_floppy)
646c0cb6 BZ	336	printk(KERN_ERR "%s: DMA %s error\n",
	337	drive->name, rq_data_dir(pc->rq)
	338	? "write" : "read");
	339	pc->flags \|= PC_FLAG_DMA_ERROR;
	340	} else {
	341	pc->xferred = pc->req_xfer;
85e39035 BZ	342	if (drive->pc_update_buffers)
85e39035 BZ	343	drive->pc_update_buffers(drive, pc);
646c0cb6 BZ	344	}
	345	debug_log("%s: DMA finished\n", drive->name);
	346	}
	347
	348	/* No more interrupts */
3a7d2484	349	if ((stat & ATA_DRQ) == 0) {
646c0cb6 BZ	350	debug_log("Packet command completed, %d bytes transferred\n",
	351	pc->xferred);
	352
	353	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
	354
	355	local_irq_enable_in_hardirq();
	356
5d655a03	357	if (drive->media == ide_tape &&
3a7d2484 BZ	358	(stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
3a7d2484 BZ	359	stat &= ~ATA_ERR;
8fccf899	360
3a7d2484	361	if ((stat & ATA_ERR) \|\| (pc->flags & PC_FLAG_DMA_ERROR)) {
646c0cb6 BZ	362	/* Error detected */
	363	debug_log("%s: I/O error\n", drive->name);
	364
5d655a03	365	if (drive->media != ide_tape)
646c0cb6	366	pc->rq->errors++;
646c0cb6	367
8fccf899	368	if (rq->cmd[0] == REQUEST_SENSE) {
646c0cb6 BZ	369	printk(KERN_ERR "%s: I/O error in request sense"
	370	" command\n", drive->name);
	371	return ide_do_reset(drive);
	372	}
	373
8fccf899	374	debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
646c0cb6 BZ	375
646c0cb6 BZ	376	/* Retry operation */
6b0da28b	377	ide_retry_pc(drive, rq->rq_disk);
8fccf899	378
646c0cb6 BZ	379	/* queued, but not started */
	380	return ide_stopped;
	381	}
646c0cb6	382	pc->error = 0;
b14c7212 BZ	383
	384	if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
	385	dsc = 1;
8fccf899	386
646c0cb6	387	/* Command finished - Call the callback function */
b14c7212	388	drive->pc_callback(drive, dsc);
8fccf899	389
646c0cb6 BZ	390	return ide_stopped;
	391	}
	392
	393	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
	394	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
	395	printk(KERN_ERR "%s: The device wants to issue more interrupts "
	396	"in DMA mode\n", drive->name);
	397	ide_dma_off(drive);
	398	return ide_do_reset(drive);
	399	}
646c0cb6	400
1823649b BZ	401	/* Get the number of bytes to transfer on this interrupt. */
1823649b BZ	402	ide_read_bcount_and_ireason(drive, &bcount, &ireason);
646c0cb6	403
3a7d2484	404	if (ireason & ATAPI_COD) {
646c0cb6 BZ	405	printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
	406	return ide_do_reset(drive);
	407	}
8fccf899	408
3a7d2484 BZ	409	if (((ireason & ATAPI_IO) == ATAPI_IO) ==
3a7d2484 BZ	410	!!(pc->flags & PC_FLAG_WRITING)) {
646c0cb6 BZ	411	/* Hopefully, we will never get here */
	412	printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
	413	"to %s!\n", drive->name,
3a7d2484 BZ	414	(ireason & ATAPI_IO) ? "Write" : "Read",
3a7d2484 BZ	415	(ireason & ATAPI_IO) ? "Read" : "Write");
646c0cb6 BZ	416	return ide_do_reset(drive);
646c0cb6 BZ	417	}
8fccf899	418
646c0cb6 BZ	419	if (!(pc->flags & PC_FLAG_WRITING)) {
	420	/* Reading - Check that we have enough space */
	421	temp = pc->xferred + bcount;
	422	if (temp > pc->req_xfer) {
	423	if (temp > pc->buf_size) {
	424	printk(KERN_ERR "%s: The device wants to send "
	425	"us more data than expected - "
	426	"discarding data\n",
	427	drive->name);
5d655a03 BP	428
5d655a03 BP	429	ide_pad_transfer(drive, 0, bcount);
844b9468	430	goto next_irq;
646c0cb6 BZ	431	}
	432	debug_log("The device wants to send us more data than "
	433	"expected - allowing transfer\n");
	434	}
374e042c	435	xferfunc = tp_ops->input_data;
646c0cb6	436	} else
374e042c	437	xferfunc = tp_ops->output_data;
646c0cb6	438
5d655a03 BP	439	if ((drive->media == ide_floppy && !pc->buf) \|\|
5d655a03 BP	440	(drive->media == ide_tape && pc->bh)) {
85e39035	441	int done = drive->pc_io_buffers(drive, pc, bcount,
acaa0f5f BZ	442	!!(pc->flags & PC_FLAG_WRITING));
	443
	444	/* FIXME: don't do partial completions */
5d655a03	445	if (drive->media == ide_floppy)
acaa0f5f BZ	446	ide_end_request(drive, 1, done >> 9);
acaa0f5f BZ	447	} else
646c0cb6 BZ	448	xferfunc(drive, NULL, pc->cur_pos, bcount);
	449
	450	/* Update the current position */
	451	pc->xferred += bcount;
	452	pc->cur_pos += bcount;
	453
	454	debug_log("[cmd %x] transferred %d bytes on that intr.\n",
8fccf899	455	rq->cmd[0], bcount);
844b9468	456	next_irq:
646c0cb6	457	/* And set the interrupt handler again */
5d655a03	458	ide_set_handler(drive, ide_pc_intr, timeout, NULL);
646c0cb6 BZ	459	return ide_started;
646c0cb6 BZ	460	}
594c16d8	461
7a254df0 BZ	462	static void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount)
	463	{
	464	ide_hwif_t *hwif = drive->hwif;
	465	ide_task_t task;
	466	u8 dma = drive->dma;
	467
	468	memset(&task, 0, sizeof(task));
	469	task.tf_flags = IDE_TFLAG_OUT_LBAH \| IDE_TFLAG_OUT_LBAM \|
	470	IDE_TFLAG_OUT_FEATURE \| tf_flags;
	471	task.tf.feature = dma; /* Use PIO/DMA */
	472	task.tf.lbam = bcount & 0xff;
	473	task.tf.lbah = (bcount >> 8) & 0xff;
	474
	475	ide_tf_dump(drive->name, &task.tf);
	476	hwif->tp_ops->set_irq(hwif, 1);
	477	SELECT_MASK(drive, 0);
	478	hwif->tp_ops->tf_load(drive, &task);
	479	}
	480
88a72109 BZ	481	static u8 ide_read_ireason(ide_drive_t *drive)
	482	{
	483	ide_task_t task;
	484
	485	memset(&task, 0, sizeof(task));
	486	task.tf_flags = IDE_TFLAG_IN_NSECT;
	487
374e042c	488	drive->hwif->tp_ops->tf_read(drive, &task);
88a72109 BZ	489
	490	return task.tf.nsect & 3;
	491	}
	492
594c16d8 BZ	493	static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
594c16d8 BZ	494	{
594c16d8 BZ	495	int retries = 100;
594c16d8 BZ	496
3a7d2484 BZ	497	while (retries-- && ((ireason & ATAPI_COD) == 0 \|\|
3a7d2484 BZ	498	(ireason & ATAPI_IO))) {
594c16d8 BZ	499	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	500	"a packet command, retrying\n", drive->name);
	501	udelay(100);
88a72109	502	ireason = ide_read_ireason(drive);
594c16d8 BZ	503	if (retries == 0) {
	504	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	505	"a packet command, ignoring\n",
	506	drive->name);
3a7d2484 BZ	507	ireason \|= ATAPI_COD;
3a7d2484 BZ	508	ireason &= ~ATAPI_IO;
594c16d8 BZ	509	}
	510	}
	511
	512	return ireason;
	513	}
	514
baf08f0b BZ	515	static int ide_delayed_transfer_pc(ide_drive_t *drive)
	516	{
	517	/* Send the actual packet */
	518	drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12);
	519
	520	/* Timeout for the packet command */
	521	return WAIT_FLOPPY_CMD;
	522	}
	523
	524	static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
594c16d8	525	{
b16aabc9	526	struct ide_atapi_pc *uninitialized_var(pc);
594c16d8	527	ide_hwif_t *hwif = drive->hwif;
b65fac32	528	struct request *rq = hwif->rq;
baf08f0b BZ	529	ide_expiry_t *expiry;
baf08f0b BZ	530	unsigned int timeout;
8c662852	531	int cmd_len;
594c16d8 BZ	532	ide_startstop_t startstop;
	533	u8 ireason;
	534
3a7d2484	535	if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
594c16d8 BZ	536	printk(KERN_ERR "%s: Strange, packet command initiated yet "
	537	"DRQ isn't asserted\n", drive->name);
	538	return startstop;
	539	}
	540
5f25843f BP	541	if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
	542	if (drive->dma)
	543	drive->waiting_for_dma = 1;
	544	}
	545
8c662852 BP	546	if (dev_is_idecd(drive)) {
	547	/* ATAPI commands get padded out to 12 bytes minimum */
	548	cmd_len = COMMAND_SIZE(rq->cmd[0]);
	549	if (cmd_len < ATAPI_MIN_CDB_BYTES)
	550	cmd_len = ATAPI_MIN_CDB_BYTES;
8c662852	551
def860d0 BP	552	timeout = rq->timeout;
def860d0 BP	553	expiry = ide_cd_expiry;
baf08f0b	554	} else {
b16aabc9 BP	555	pc = drive->pc;
b16aabc9 BP	556
def860d0 BP	557	cmd_len = ATAPI_MIN_CDB_BYTES;
	558
	559	/*
	560	* If necessary schedule the packet transfer to occur 'timeout'
	561	* miliseconds later in ide_delayed_transfer_pc() after the
	562	* device says it's ready for a packet.
	563	*/
	564	if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
	565	timeout = drive->pc_delay;
	566	expiry = &ide_delayed_transfer_pc;
	567	} else {
	568	timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
	569	: WAIT_TAPE_CMD;
	570	expiry = NULL;
	571	}
06cc2778 BP	572
	573	ireason = ide_read_ireason(drive);
	574	if (drive->media == ide_tape)
	575	ireason = ide_wait_ireason(drive, ireason);
	576
	577	if ((ireason & ATAPI_COD) == 0 \|\| (ireason & ATAPI_IO)) {
	578	printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
	579	"a packet command\n", drive->name);
	580
	581	return ide_do_reset(drive);
	582	}
baf08f0b BZ	583	}
baf08f0b BZ	584
594c16d8	585	/* Set the interrupt routine */
d6251d44 BP	586	ide_set_handler(drive,
	587	(dev_is_idecd(drive) ? drive->irq_handler
	588	: ide_pc_intr),
	589	timeout, expiry);
594c16d8 BZ	590
594c16d8 BZ	591	/* Begin DMA, if necessary */
b16aabc9 BP	592	if (dev_is_idecd(drive)) {
	593	if (drive->dma)
	594	hwif->dma_ops->dma_start(drive);
	595	} else {
	596	if (pc->flags & PC_FLAG_DMA_OK) {
	597	pc->flags \|= PC_FLAG_DMA_IN_PROGRESS;
	598	hwif->dma_ops->dma_start(drive);
	599	}
594c16d8 BZ	600	}
	601
	602	/* Send the actual packet */
ea68d270	603	if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
8c662852	604	hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
594c16d8 BZ	605
	606	return ide_started;
	607	}
6bf1641c	608
28ad91db	609	ide_startstop_t ide_issue_pc(ide_drive_t *drive)
6bf1641c	610	{
d77612ab	611	struct ide_atapi_pc *pc;
6bf1641c	612	ide_hwif_t *hwif = drive->hwif;
4cad085e	613	ide_expiry_t *expiry = NULL;
28ad91db	614	unsigned int timeout;
f9476b96	615	u32 tf_flags;
392de1d5	616	u16 bcount;
6bf1641c	617
ed48554f BP	618	if (dev_is_idecd(drive)) {
ed48554f BP	619	tf_flags = IDE_TFLAG_OUT_NSECT \| IDE_TFLAG_OUT_LBAL;
b65fac32	620	bcount = ide_cd_get_xferlen(hwif->rq);
4cad085e	621	expiry = ide_cd_expiry;
28ad91db	622	timeout = ATAPI_WAIT_PC;
d77612ab BP	623
	624	if (drive->dma)
	625	drive->dma = !hwif->dma_ops->dma_setup(drive);
ed48554f	626	} else {
d77612ab BP	627	pc = drive->pc;
	628
	629	/* We haven't transferred any data yet */
	630	pc->xferred = 0;
	631	pc->cur_pos = pc->buf;
	632
ed48554f BP	633	tf_flags = IDE_TFLAG_OUT_DEVICE;
	634	bcount = ((drive->media == ide_tape) ?
	635	pc->req_xfer :
	636	min(pc->req_xfer, 63 * 1024));
6bf1641c	637
d77612ab BP	638	if (pc->flags & PC_FLAG_DMA_ERROR) {
	639	pc->flags &= ~PC_FLAG_DMA_ERROR;
	640	ide_dma_off(drive);
	641	}
6bf1641c	642
d77612ab BP	643	if ((pc->flags & PC_FLAG_DMA_OK) &&
	644	(drive->dev_flags & IDE_DFLAG_USING_DMA))
	645	drive->dma = !hwif->dma_ops->dma_setup(drive);
6bf1641c	646
d77612ab BP	647	if (!drive->dma)
d77612ab BP	648	pc->flags &= ~PC_FLAG_DMA_OK;
28ad91db BP	649
	650	timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
	651	: WAIT_TAPE_CMD;
d77612ab	652	}
6bf1641c	653
7a254df0	654	ide_pktcmd_tf_load(drive, tf_flags, bcount);
6bf1641c BZ	655
6bf1641c BZ	656	/* Issue the packet command */
ac77ef8b	657	if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
5f25843f BP	658	if (drive->dma)
5f25843f BP	659	drive->waiting_for_dma = 0;
baf08f0b	660	ide_execute_command(drive, ATA_CMD_PACKET, ide_transfer_pc,
4cad085e	661	timeout, expiry);
6bf1641c BZ	662	return ide_started;
	663	} else {
	664	ide_execute_pkt_cmd(drive);
baf08f0b	665	return ide_transfer_pc(drive);
6bf1641c BZ	666	}
	667	}
	668	EXPORT_SYMBOL_GPL(ide_issue_pc);