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

/*
 * ATAPI support.
 */

#include <linux/kernel.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);

/*
 * 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;
	}

	ireason = ide_read_ireason(drive);
	if (drive->media == ide_tape &&
	    (drive->dev_flags & IDE_DFLAG_SCSI) == 0)
		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 {
		if (drive->dev_flags & IDE_DFLAG_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;
		}
	}

	/* 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,
			     ide_expiry_t *expiry)
{
	struct ide_atapi_pc *pc = drive->pc;
	ide_hwif_t *hwif = drive->hwif;
	u32 tf_flags;
	u16 bcount = 0;
	u8 scsi = !!(drive->dev_flags & IDE_DFLAG_SCSI);

	/* 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;
	} else if (scsi) {
		tf_flags = 0;
		bcount = min(pc->req_xfer, 63 * 1024);
	} 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) {
		if (scsi)
			hwif->sg_mapped = 1;
		drive->dma = !hwif->dma_ops->dma_setup(drive);
		if (scsi)
			hwif->sg_mapped = 0;
	}

	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) {
		ide_execute_command(drive, ATA_CMD_PACKET, ide_transfer_pc,
				    timeout, NULL);
		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>
	6	#include <linux/delay.h>
	7	#include <linux/ide.h>
646c0cb6 BZ	8	#include <scsi/scsi.h>
	9
	10	#ifdef DEBUG
	11	#define debug_log(fmt, args...) \
	12	printk(KERN_INFO "ide: " fmt, ## args)
	13	#else
	14	#define debug_log(fmt, args...) do {} while (0)
	15	#endif
	16
991cb26a BP	17	static inline int dev_is_idecd(ide_drive_t *drive)
	18	{
	19	return (drive->media == ide_cdrom \|\| drive->media == ide_optical) &&
	20	!(drive->dev_flags & IDE_DFLAG_SCSI);
	21	}
	22
51509eec BZ	23	/*
	24	* Check whether we can support a device,
	25	* based on the ATAPI IDENTIFY command results.
	26	*/
	27	int ide_check_atapi_device(ide_drive_t drive, const char s)
	28	{
	29	u16 *id = drive->id;
	30	u8 gcw[2], protocol, device_type, removable, drq_type, packet_size;
	31
	32	((u16 )&gcw) = id[ATA_ID_CONFIG];
	33
	34	protocol = (gcw[1] & 0xC0) >> 6;
	35	device_type = gcw[1] & 0x1F;
	36	removable = (gcw[0] & 0x80) >> 7;
	37	drq_type = (gcw[0] & 0x60) >> 5;
	38	packet_size = gcw[0] & 0x03;
	39
	40	#ifdef CONFIG_PPC
	41	/* kludge for Apple PowerBook internal zip */
	42	if (drive->media == ide_floppy && device_type == 5 &&
	43	!strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&
	44	strstr((char *)&id[ATA_ID_PROD], "ZIP"))
	45	device_type = 0;
	46	#endif
	47
	48	if (protocol != 2)
	49	printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n",
	50	s, drive->name, protocol);
	51	else if ((drive->media == ide_floppy && device_type != 0) \|\|
	52	(drive->media == ide_tape && device_type != 1))
	53	printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n",
	54	s, drive->name, device_type);
	55	else if (removable == 0)
	56	printk(KERN_ERR "%s: %s: the removable flag is not set\n",
	57	s, drive->name);
	58	else if (drive->media == ide_floppy && drq_type == 3)
	59	printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not "
	60	"supported\n", s, drive->name, drq_type);
	61	else if (packet_size != 0)
	62	printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 "
	63	"bytes\n", s, drive->name, packet_size);
	64	else
	65	return 1;
	66	return 0;
	67	}
	68	EXPORT_SYMBOL_GPL(ide_check_atapi_device);
	69
acaa0f5f BZ	70	/* PIO data transfer routine using the scatter gather table. */
	71	int ide_io_buffers(ide_drive_t drive, struct ide_atapi_pc pc,
	72	unsigned int bcount, int write)
	73	{
	74	ide_hwif_t *hwif = drive->hwif;
	75	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
	76	xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
	77	struct scatterlist *sg = pc->sg;
	78	char *buf;
	79	int count, done = 0;
	80
	81	while (bcount) {
	82	count = min(sg->length - pc->b_count, bcount);
	83
	84	if (PageHighMem(sg_page(sg))) {
	85	unsigned long flags;
	86
	87	local_irq_save(flags);
	88	buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
	89	xf(drive, NULL, buf + pc->b_count, count);
	90	kunmap_atomic(buf - sg->offset, KM_IRQ0);
	91	local_irq_restore(flags);
	92	} else {
	93	buf = sg_virt(sg);
	94	xf(drive, NULL, buf + pc->b_count, count);
	95	}
	96
	97	bcount -= count;
	98	pc->b_count += count;
	99	done += count;
	100
	101	if (pc->b_count == sg->length) {
	102	if (!--pc->sg_cnt)
	103	break;
	104	pc->sg = sg = sg_next(sg);
	105	pc->b_count = 0;
	106	}
	107	}
	108
	109	if (bcount) {
	110	printk(KERN_ERR "%s: %d leftover bytes, %s\n", drive->name,
	111	bcount, write ? "padding with zeros"
	112	: "discarding data");
	113	ide_pad_transfer(drive, write, bcount);
	114	}
	115
	116	return done;
	117	}
	118	EXPORT_SYMBOL_GPL(ide_io_buffers);
	119
7bf7420a BZ	120	void ide_init_pc(struct ide_atapi_pc *pc)
	121	{
	122	memset(pc, 0, sizeof(*pc));
	123	pc->buf = pc->pc_buf;
	124	pc->buf_size = IDE_PC_BUFFER_SIZE;
	125	}
	126	EXPORT_SYMBOL_GPL(ide_init_pc);
	127
7645c151 BZ	128	/*
	129	* Generate a new packet command request in front of the request queue, before
	130	* the current request, so that it will be processed immediately, on the next
	131	* pass through the driver.
	132	*/
6b0da28b BZ	133	static void ide_queue_pc_head(ide_drive_t drive, struct gendisk disk,
6b0da28b BZ	134	struct ide_atapi_pc pc, struct request rq)
7645c151 BZ	135	{
	136	blk_rq_init(NULL, rq);
	137	rq->cmd_type = REQ_TYPE_SPECIAL;
	138	rq->cmd_flags \|= REQ_PREEMPT;
	139	rq->buffer = (char *)pc;
	140	rq->rq_disk = disk;
	141	memcpy(rq->cmd, pc->c, 12);
	142	if (drive->media == ide_tape)
	143	rq->cmd[13] = REQ_IDETAPE_PC1;
	144	ide_do_drive_cmd(drive, rq);
	145	}
7645c151	146
2ac07d92 BZ	147	/*
	148	* Add a special packet command request to the tail of the request queue,
	149	* and wait for it to be serviced.
	150	*/
	151	int ide_queue_pc_tail(ide_drive_t drive, struct gendisk disk,
	152	struct ide_atapi_pc *pc)
	153	{
	154	struct request *rq;
	155	int error;
	156
	157	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
	158	rq->cmd_type = REQ_TYPE_SPECIAL;
	159	rq->buffer = (char *)pc;
	160	memcpy(rq->cmd, pc->c, 12);
	161	if (drive->media == ide_tape)
	162	rq->cmd[13] = REQ_IDETAPE_PC1;
	163	error = blk_execute_rq(drive->queue, disk, rq, 0);
	164	blk_put_request(rq);
	165
	166	return error;
	167	}
	168	EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
	169
de699ad5 BZ	170	int ide_do_test_unit_ready(ide_drive_t drive, struct gendisk disk)
	171	{
	172	struct ide_atapi_pc pc;
	173
	174	ide_init_pc(&pc);
	175	pc.c[0] = TEST_UNIT_READY;
	176
	177	return ide_queue_pc_tail(drive, disk, &pc);
	178	}
	179	EXPORT_SYMBOL_GPL(ide_do_test_unit_ready);
	180
0c8a6c7a BZ	181	int ide_do_start_stop(ide_drive_t drive, struct gendisk disk, int start)
	182	{
	183	struct ide_atapi_pc pc;
	184
	185	ide_init_pc(&pc);
	186	pc.c[0] = START_STOP;
	187	pc.c[4] = start;
	188
	189	if (drive->media == ide_tape)
	190	pc.flags \|= PC_FLAG_WAIT_FOR_DSC;
	191
	192	return ide_queue_pc_tail(drive, disk, &pc);
	193	}
	194	EXPORT_SYMBOL_GPL(ide_do_start_stop);
	195
0578042d BZ	196	int ide_set_media_lock(ide_drive_t drive, struct gendisk disk, int on)
	197	{
	198	struct ide_atapi_pc pc;
	199
42619d35	200	if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)
0578042d BZ	201	return 0;
	202
	203	ide_init_pc(&pc);
	204	pc.c[0] = ALLOW_MEDIUM_REMOVAL;
	205	pc.c[4] = on;
	206
	207	return ide_queue_pc_tail(drive, disk, &pc);
	208	}
	209	EXPORT_SYMBOL_GPL(ide_set_media_lock);
	210
6b0da28b BZ	211	void ide_create_request_sense_cmd(ide_drive_t drive, struct ide_atapi_pc pc)
	212	{
	213	ide_init_pc(pc);
	214	pc->c[0] = REQUEST_SENSE;
	215	if (drive->media == ide_floppy) {
	216	pc->c[4] = 255;
	217	pc->req_xfer = 18;
	218	} else {
	219	pc->c[4] = 20;
	220	pc->req_xfer = 20;
	221	}
	222	}
	223	EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd);
	224
	225	/*
	226	* Called when an error was detected during the last packet command.
	227	* We queue a request sense packet command in the head of the request list.
	228	*/
	229	void ide_retry_pc(ide_drive_t drive, struct gendisk disk)
	230	{
	231	struct request *rq = &drive->request_sense_rq;
	232	struct ide_atapi_pc *pc = &drive->request_sense_pc;
	233
	234	(void)ide_read_error(drive);
	235	ide_create_request_sense_cmd(drive, pc);
	236	if (drive->media == ide_tape)
	237	set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
	238	ide_queue_pc_head(drive, disk, pc, rq);
	239	}
	240	EXPORT_SYMBOL_GPL(ide_retry_pc);
	241
844b9468 BZ	242	int ide_scsi_expiry(ide_drive_t *drive)
	243	{
	244	struct ide_atapi_pc *pc = drive->pc;
	245
	246	debug_log("%s called for %lu at %lu\n", __func__,
	247	pc->scsi_cmd->serial_number, jiffies);
	248
	249	pc->flags \|= PC_FLAG_TIMEDOUT;
	250
	251	return 0; /* we do not want the IDE subsystem to retry */
	252	}
	253	EXPORT_SYMBOL_GPL(ide_scsi_expiry);
	254
aa5d2de7 BZ	255	/*
	256	* This is the usual interrupt handler which will be called during a packet
	257	* command. We will transfer some of the data (as requested by the drive)
	258	* and will re-point interrupt handler to us.
	259	*/
	260	static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
646c0cb6	261	{
2b9efba4	262	struct ide_atapi_pc *pc = drive->pc;
646c0cb6	263	ide_hwif_t *hwif = drive->hwif;
8fccf899	264	struct request *rq = hwif->hwgroup->rq;
374e042c	265	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
646c0cb6	266	xfer_func_t *xferfunc;
844b9468 BZ	267	ide_expiry_t *expiry;
844b9468 BZ	268	unsigned int timeout, temp;
646c0cb6	269	u16 bcount;
97100fc8	270	u8 stat, ireason, scsi = !!(drive->dev_flags & IDE_DFLAG_SCSI), dsc = 0;
646c0cb6 BZ	271
	272	debug_log("Enter %s - interrupt handler\n", __func__);
	273
844b9468 BZ	274	if (scsi) {
	275	timeout = ide_scsi_get_timeout(pc);
	276	expiry = ide_scsi_expiry;
	277	} else {
	278	timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
	279	: WAIT_TAPE_CMD;
	280	expiry = NULL;
	281	}
	282
646c0cb6	283	if (pc->flags & PC_FLAG_TIMEDOUT) {
b14c7212	284	drive->pc_callback(drive, 0);
646c0cb6 BZ	285	return ide_stopped;
	286	}
	287
	288	/* Clear the interrupt */
374e042c	289	stat = tp_ops->read_status(hwif);
646c0cb6 BZ	290
	291	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
	292	if (hwif->dma_ops->dma_end(drive) \|\|
3a7d2484	293	(drive->media == ide_tape && !scsi && (stat & ATA_ERR))) {
646c0cb6 BZ	294	if (drive->media == ide_floppy && !scsi)
	295	printk(KERN_ERR "%s: DMA %s error\n",
	296	drive->name, rq_data_dir(pc->rq)
	297	? "write" : "read");
	298	pc->flags \|= PC_FLAG_DMA_ERROR;
	299	} else {
	300	pc->xferred = pc->req_xfer;
85e39035 BZ	301	if (drive->pc_update_buffers)
85e39035 BZ	302	drive->pc_update_buffers(drive, pc);
646c0cb6 BZ	303	}
	304	debug_log("%s: DMA finished\n", drive->name);
	305	}
	306
	307	/* No more interrupts */
3a7d2484	308	if ((stat & ATA_DRQ) == 0) {
646c0cb6 BZ	309	debug_log("Packet command completed, %d bytes transferred\n",
	310	pc->xferred);
	311
	312	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
	313
	314	local_irq_enable_in_hardirq();
	315
	316	if (drive->media == ide_tape && !scsi &&
3a7d2484 BZ	317	(stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
3a7d2484 BZ	318	stat &= ~ATA_ERR;
8fccf899	319
3a7d2484	320	if ((stat & ATA_ERR) \|\| (pc->flags & PC_FLAG_DMA_ERROR)) {
646c0cb6 BZ	321	/* Error detected */
	322	debug_log("%s: I/O error\n", drive->name);
	323
	324	if (drive->media != ide_tape \|\| scsi) {
	325	pc->rq->errors++;
	326	if (scsi)
	327	goto cmd_finished;
	328	}
	329
8fccf899	330	if (rq->cmd[0] == REQUEST_SENSE) {
646c0cb6 BZ	331	printk(KERN_ERR "%s: I/O error in request sense"
	332	" command\n", drive->name);
	333	return ide_do_reset(drive);
	334	}
	335
8fccf899	336	debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
646c0cb6 BZ	337
646c0cb6 BZ	338	/* Retry operation */
6b0da28b	339	ide_retry_pc(drive, rq->rq_disk);
8fccf899	340
646c0cb6 BZ	341	/* queued, but not started */
	342	return ide_stopped;
	343	}
	344	cmd_finished:
	345	pc->error = 0;
b14c7212 BZ	346
	347	if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
	348	dsc = 1;
8fccf899	349
646c0cb6	350	/* Command finished - Call the callback function */
b14c7212	351	drive->pc_callback(drive, dsc);
8fccf899	352
646c0cb6 BZ	353	return ide_stopped;
	354	}
	355
	356	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
	357	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
	358	printk(KERN_ERR "%s: The device wants to issue more interrupts "
	359	"in DMA mode\n", drive->name);
	360	ide_dma_off(drive);
	361	return ide_do_reset(drive);
	362	}
646c0cb6	363
1823649b BZ	364	/* Get the number of bytes to transfer on this interrupt. */
1823649b BZ	365	ide_read_bcount_and_ireason(drive, &bcount, &ireason);
646c0cb6	366
3a7d2484	367	if (ireason & ATAPI_COD) {
646c0cb6 BZ	368	printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
	369	return ide_do_reset(drive);
	370	}
8fccf899	371
3a7d2484 BZ	372	if (((ireason & ATAPI_IO) == ATAPI_IO) ==
3a7d2484 BZ	373	!!(pc->flags & PC_FLAG_WRITING)) {
646c0cb6 BZ	374	/* Hopefully, we will never get here */
	375	printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
	376	"to %s!\n", drive->name,
3a7d2484 BZ	377	(ireason & ATAPI_IO) ? "Write" : "Read",
3a7d2484 BZ	378	(ireason & ATAPI_IO) ? "Read" : "Write");
646c0cb6 BZ	379	return ide_do_reset(drive);
646c0cb6 BZ	380	}
8fccf899	381
646c0cb6 BZ	382	if (!(pc->flags & PC_FLAG_WRITING)) {
	383	/* Reading - Check that we have enough space */
	384	temp = pc->xferred + bcount;
	385	if (temp > pc->req_xfer) {
	386	if (temp > pc->buf_size) {
	387	printk(KERN_ERR "%s: The device wants to send "
	388	"us more data than expected - "
	389	"discarding data\n",
	390	drive->name);
	391	if (scsi)
	392	temp = pc->buf_size - pc->xferred;
	393	else
	394	temp = 0;
	395	if (temp) {
	396	if (pc->sg)
85e39035 BZ	397	drive->pc_io_buffers(drive, pc,
85e39035 BZ	398	temp, 0);
646c0cb6	399	else
374e042c	400	tp_ops->input_data(drive, NULL,
646c0cb6 BZ	401	pc->cur_pos, temp);
	402	printk(KERN_ERR "%s: transferred %d of "
	403	"%d bytes\n",
	404	drive->name,
	405	temp, bcount);
	406	}
	407	pc->xferred += temp;
	408	pc->cur_pos += temp;
	409	ide_pad_transfer(drive, 0, bcount - temp);
844b9468	410	goto next_irq;
646c0cb6 BZ	411	}
	412	debug_log("The device wants to send us more data than "
	413	"expected - allowing transfer\n");
	414	}
374e042c	415	xferfunc = tp_ops->input_data;
646c0cb6	416	} else
374e042c	417	xferfunc = tp_ops->output_data;
646c0cb6 BZ	418
	419	if ((drive->media == ide_floppy && !scsi && !pc->buf) \|\|
	420	(drive->media == ide_tape && !scsi && pc->bh) \|\|
acaa0f5f	421	(scsi && pc->sg)) {
85e39035	422	int done = drive->pc_io_buffers(drive, pc, bcount,
acaa0f5f BZ	423	!!(pc->flags & PC_FLAG_WRITING));
	424
	425	/* FIXME: don't do partial completions */
	426	if (drive->media == ide_floppy && !scsi)
	427	ide_end_request(drive, 1, done >> 9);
	428	} else
646c0cb6 BZ	429	xferfunc(drive, NULL, pc->cur_pos, bcount);
	430
	431	/* Update the current position */
	432	pc->xferred += bcount;
	433	pc->cur_pos += bcount;
	434
	435	debug_log("[cmd %x] transferred %d bytes on that intr.\n",
8fccf899	436	rq->cmd[0], bcount);
844b9468	437	next_irq:
646c0cb6	438	/* And set the interrupt handler again */
aa5d2de7	439	ide_set_handler(drive, ide_pc_intr, timeout, expiry);
646c0cb6 BZ	440	return ide_started;
646c0cb6 BZ	441	}
594c16d8	442
88a72109 BZ	443	static u8 ide_read_ireason(ide_drive_t *drive)
	444	{
	445	ide_task_t task;
	446
	447	memset(&task, 0, sizeof(task));
	448	task.tf_flags = IDE_TFLAG_IN_NSECT;
	449
374e042c	450	drive->hwif->tp_ops->tf_read(drive, &task);
88a72109 BZ	451
	452	return task.tf.nsect & 3;
	453	}
	454
594c16d8 BZ	455	static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
594c16d8 BZ	456	{
594c16d8 BZ	457	int retries = 100;
594c16d8 BZ	458
3a7d2484 BZ	459	while (retries-- && ((ireason & ATAPI_COD) == 0 \|\|
3a7d2484 BZ	460	(ireason & ATAPI_IO))) {
594c16d8 BZ	461	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	462	"a packet command, retrying\n", drive->name);
	463	udelay(100);
88a72109	464	ireason = ide_read_ireason(drive);
594c16d8 BZ	465	if (retries == 0) {
	466	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	467	"a packet command, ignoring\n",
	468	drive->name);
3a7d2484 BZ	469	ireason \|= ATAPI_COD;
3a7d2484 BZ	470	ireason &= ~ATAPI_IO;
594c16d8 BZ	471	}
	472	}
	473
	474	return ireason;
	475	}
	476
baf08f0b BZ	477	static int ide_delayed_transfer_pc(ide_drive_t *drive)
	478	{
	479	/* Send the actual packet */
	480	drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12);
	481
	482	/* Timeout for the packet command */
	483	return WAIT_FLOPPY_CMD;
	484	}
	485
	486	static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
594c16d8	487	{
2b9efba4	488	struct ide_atapi_pc *pc = drive->pc;
594c16d8	489	ide_hwif_t *hwif = drive->hwif;
8fccf899	490	struct request *rq = hwif->hwgroup->rq;
baf08f0b BZ	491	ide_expiry_t *expiry;
baf08f0b BZ	492	unsigned int timeout;
594c16d8 BZ	493	ide_startstop_t startstop;
	494	u8 ireason;
	495
3a7d2484	496	if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
594c16d8 BZ	497	printk(KERN_ERR "%s: Strange, packet command initiated yet "
	498	"DRQ isn't asserted\n", drive->name);
	499	return startstop;
	500	}
	501
88a72109	502	ireason = ide_read_ireason(drive);
97100fc8 BZ	503	if (drive->media == ide_tape &&
97100fc8 BZ	504	(drive->dev_flags & IDE_DFLAG_SCSI) == 0)
594c16d8 BZ	505	ireason = ide_wait_ireason(drive, ireason);
594c16d8 BZ	506
3a7d2484	507	if ((ireason & ATAPI_COD) == 0 \|\| (ireason & ATAPI_IO)) {
594c16d8 BZ	508	printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
	509	"a packet command\n", drive->name);
	510	return ide_do_reset(drive);
	511	}
	512
baf08f0b BZ	513	/*
	514	* If necessary schedule the packet transfer to occur 'timeout'
	515	* miliseconds later in ide_delayed_transfer_pc() after the device
	516	* says it's ready for a packet.
	517	*/
	518	if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
	519	timeout = drive->pc_delay;
	520	expiry = &ide_delayed_transfer_pc;
	521	} else {
97100fc8	522	if (drive->dev_flags & IDE_DFLAG_SCSI) {
baf08f0b BZ	523	timeout = ide_scsi_get_timeout(pc);
	524	expiry = ide_scsi_expiry;
	525	} else {
	526	timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
	527	: WAIT_TAPE_CMD;
	528	expiry = NULL;
	529	}
	530	}
	531
594c16d8	532	/* Set the interrupt routine */
aa5d2de7	533	ide_set_handler(drive, ide_pc_intr, timeout, expiry);
594c16d8 BZ	534
	535	/* Begin DMA, if necessary */
	536	if (pc->flags & PC_FLAG_DMA_OK) {
	537	pc->flags \|= PC_FLAG_DMA_IN_PROGRESS;
	538	hwif->dma_ops->dma_start(drive);
	539	}
	540
	541	/* Send the actual packet */
ea68d270	542	if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
8fccf899	543	hwif->tp_ops->output_data(drive, NULL, rq->cmd, 12);
594c16d8 BZ	544
	545	return ide_started;
	546	}
6bf1641c	547
baf08f0b	548	ide_startstop_t ide_issue_pc(ide_drive_t *drive, unsigned int timeout,
6bf1641c BZ	549	ide_expiry_t *expiry)
6bf1641c BZ	550	{
2b9efba4	551	struct ide_atapi_pc *pc = drive->pc;
6bf1641c	552	ide_hwif_t *hwif = drive->hwif;
f9476b96	553	u32 tf_flags;
ed48554f	554	u16 bcount = 0;
0a9b6f88	555	u8 scsi = !!(drive->dev_flags & IDE_DFLAG_SCSI);
6bf1641c BZ	556
	557	/* We haven't transferred any data yet */
	558	pc->xferred = 0;
	559	pc->cur_pos = pc->buf;
	560
ed48554f BP	561	if (dev_is_idecd(drive)) {
	562	tf_flags = IDE_TFLAG_OUT_NSECT \| IDE_TFLAG_OUT_LBAL;
	563	} else if (scsi) {
	564	tf_flags = 0;
6bf1641c	565	bcount = min(pc->req_xfer, 63 * 1024);
ed48554f BP	566	} else {
	567	tf_flags = IDE_TFLAG_OUT_DEVICE;
	568	bcount = ((drive->media == ide_tape) ?
	569	pc->req_xfer :
	570	min(pc->req_xfer, 63 * 1024));
	571	}
6bf1641c BZ	572
	573	if (pc->flags & PC_FLAG_DMA_ERROR) {
	574	pc->flags &= ~PC_FLAG_DMA_ERROR;
	575	ide_dma_off(drive);
	576	}
	577
4f02ff06 BP	578	if (((pc->flags & PC_FLAG_DMA_OK) &&
	579	(drive->dev_flags & IDE_DFLAG_USING_DMA)) \|\|
	580	drive->dma) {
97100fc8	581	if (scsi)
6bf1641c	582	hwif->sg_mapped = 1;
0a9b6f88	583	drive->dma = !hwif->dma_ops->dma_setup(drive);
97100fc8	584	if (scsi)
6bf1641c BZ	585	hwif->sg_mapped = 0;
	586	}
	587
0a9b6f88	588	if (!drive->dma)
6bf1641c BZ	589	pc->flags &= ~PC_FLAG_DMA_OK;
6bf1641c BZ	590
f9476b96	591	ide_pktcmd_tf_load(drive, tf_flags, bcount, drive->dma);
6bf1641c BZ	592
6bf1641c BZ	593	/* Issue the packet command */
ac77ef8b	594	if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
baf08f0b	595	ide_execute_command(drive, ATA_CMD_PACKET, ide_transfer_pc,
6bf1641c BZ	596	timeout, NULL);
	597	return ide_started;
	598	} else {
	599	ide_execute_pkt_cmd(drive);
baf08f0b	600	return ide_transfer_pc(drive);
6bf1641c BZ	601	}
	602	}
	603	EXPORT_SYMBOL_GPL(ide_issue_pc);