[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

/*
 * 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.
 */
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);
}
EXPORT_SYMBOL_GPL(ide_queue_pc_head);

/*
 * 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_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->atapi_flags & IDE_AFLAG_NO_DOORLOCK)
		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);

/* TODO: unify the code thus making some arguments go away */
ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc,
	ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry,
	void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),
	void (*retry_pc)(ide_drive_t *), void (*dsc_handle)(ide_drive_t *),
	int (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int))
{
	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;
	unsigned int temp;
	u16 bcount;
	u8 stat, ireason, scsi = drive->scsi;

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

	if (pc->flags & PC_FLAG_TIMEDOUT) {
		drive->pc_callback(drive);
		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 (update_buffers)
				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 */
			retry_pc(drive);

			/* 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_handle(drive);
			return ide_stopped;
		}

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

		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)
						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);
				ide_set_handler(drive, handler, timeout,
						expiry);
				return ide_started;
			}
			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 = 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);

	/* And set the interrupt handler again */
	ide_set_handler(drive, handler, timeout, expiry);
	return ide_started;
}
EXPORT_SYMBOL_GPL(ide_pc_intr);

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;
}

ide_startstop_t ide_transfer_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
				ide_handler_t *handler, unsigned int timeout,
				ide_expiry_t *expiry)
{
	ide_hwif_t *hwif = drive->hwif;
	struct request *rq = hwif->hwgroup->rq;
	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->scsi)
		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, handler, 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;
}
EXPORT_SYMBOL_GPL(ide_transfer_pc);

ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
			     ide_handler_t *handler, unsigned int timeout,
			     ide_expiry_t *expiry)
{
	ide_hwif_t *hwif = drive->hwif;
	u16 bcount;
	u8 dma = 0;

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

	/* Request to transfer the entire buffer at once */
	if (drive->media == ide_tape && !drive->scsi)
		bcount = pc->req_xfer;
	else
		bcount = 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->using_dma) {
		if (drive->scsi)
			hwif->sg_mapped = 1;
		dma = !hwif->dma_ops->dma_setup(drive);
		if (drive->scsi)
			hwif->sg_mapped = 0;
	}

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

	ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE,
			   bcount, dma);

	/* Issue the packet command */
	if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
		ide_execute_command(drive, ATA_CMD_PACKET, handler,
				    timeout, NULL);
		return ide_started;
	} else {
		ide_execute_pkt_cmd(drive);
		return (*handler)(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
51509eec BZ	17	/*
	18	* Check whether we can support a device,
	19	* based on the ATAPI IDENTIFY command results.
	20	*/
	21	int ide_check_atapi_device(ide_drive_t drive, const char s)
	22	{
	23	u16 *id = drive->id;
	24	u8 gcw[2], protocol, device_type, removable, drq_type, packet_size;
	25
	26	((u16 )&gcw) = id[ATA_ID_CONFIG];
	27
	28	protocol = (gcw[1] & 0xC0) >> 6;
	29	device_type = gcw[1] & 0x1F;
	30	removable = (gcw[0] & 0x80) >> 7;
	31	drq_type = (gcw[0] & 0x60) >> 5;
	32	packet_size = gcw[0] & 0x03;
	33
	34	#ifdef CONFIG_PPC
	35	/* kludge for Apple PowerBook internal zip */
	36	if (drive->media == ide_floppy && device_type == 5 &&
	37	!strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&
	38	strstr((char *)&id[ATA_ID_PROD], "ZIP"))
	39	device_type = 0;
	40	#endif
	41
	42	if (protocol != 2)
	43	printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n",
	44	s, drive->name, protocol);
	45	else if ((drive->media == ide_floppy && device_type != 0) \|\|
	46	(drive->media == ide_tape && device_type != 1))
	47	printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n",
	48	s, drive->name, device_type);
	49	else if (removable == 0)
	50	printk(KERN_ERR "%s: %s: the removable flag is not set\n",
	51	s, drive->name);
	52	else if (drive->media == ide_floppy && drq_type == 3)
	53	printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not "
	54	"supported\n", s, drive->name, drq_type);
	55	else if (packet_size != 0)
	56	printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 "
	57	"bytes\n", s, drive->name, packet_size);
	58	else
	59	return 1;
	60	return 0;
	61	}
	62	EXPORT_SYMBOL_GPL(ide_check_atapi_device);
	63
acaa0f5f BZ	64	/* PIO data transfer routine using the scatter gather table. */
	65	int ide_io_buffers(ide_drive_t drive, struct ide_atapi_pc pc,
	66	unsigned int bcount, int write)
	67	{
	68	ide_hwif_t *hwif = drive->hwif;
	69	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
	70	xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
	71	struct scatterlist *sg = pc->sg;
	72	char *buf;
	73	int count, done = 0;
	74
	75	while (bcount) {
	76	count = min(sg->length - pc->b_count, bcount);
	77
	78	if (PageHighMem(sg_page(sg))) {
	79	unsigned long flags;
	80
	81	local_irq_save(flags);
	82	buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
	83	xf(drive, NULL, buf + pc->b_count, count);
	84	kunmap_atomic(buf - sg->offset, KM_IRQ0);
	85	local_irq_restore(flags);
	86	} else {
	87	buf = sg_virt(sg);
	88	xf(drive, NULL, buf + pc->b_count, count);
	89	}
	90
	91	bcount -= count;
	92	pc->b_count += count;
	93	done += count;
	94
	95	if (pc->b_count == sg->length) {
	96	if (!--pc->sg_cnt)
	97	break;
	98	pc->sg = sg = sg_next(sg);
	99	pc->b_count = 0;
	100	}
	101	}
	102
	103	if (bcount) {
	104	printk(KERN_ERR "%s: %d leftover bytes, %s\n", drive->name,
	105	bcount, write ? "padding with zeros"
	106	: "discarding data");
	107	ide_pad_transfer(drive, write, bcount);
	108	}
	109
	110	return done;
	111	}
	112	EXPORT_SYMBOL_GPL(ide_io_buffers);
	113
7bf7420a BZ	114	void ide_init_pc(struct ide_atapi_pc *pc)
	115	{
	116	memset(pc, 0, sizeof(*pc));
	117	pc->buf = pc->pc_buf;
	118	pc->buf_size = IDE_PC_BUFFER_SIZE;
	119	}
	120	EXPORT_SYMBOL_GPL(ide_init_pc);
	121
7645c151 BZ	122	/*
	123	* Generate a new packet command request in front of the request queue, before
	124	* the current request, so that it will be processed immediately, on the next
	125	* pass through the driver.
	126	*/
	127	void ide_queue_pc_head(ide_drive_t drive, struct gendisk disk,
	128	struct ide_atapi_pc pc, struct request rq)
	129	{
	130	blk_rq_init(NULL, rq);
	131	rq->cmd_type = REQ_TYPE_SPECIAL;
	132	rq->cmd_flags \|= REQ_PREEMPT;
	133	rq->buffer = (char *)pc;
	134	rq->rq_disk = disk;
	135	memcpy(rq->cmd, pc->c, 12);
	136	if (drive->media == ide_tape)
	137	rq->cmd[13] = REQ_IDETAPE_PC1;
	138	ide_do_drive_cmd(drive, rq);
	139	}
	140	EXPORT_SYMBOL_GPL(ide_queue_pc_head);
	141
2ac07d92 BZ	142	/*
	143	* Add a special packet command request to the tail of the request queue,
	144	* and wait for it to be serviced.
	145	*/
	146	int ide_queue_pc_tail(ide_drive_t drive, struct gendisk disk,
	147	struct ide_atapi_pc *pc)
	148	{
	149	struct request *rq;
	150	int error;
	151
	152	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
	153	rq->cmd_type = REQ_TYPE_SPECIAL;
	154	rq->buffer = (char *)pc;
	155	memcpy(rq->cmd, pc->c, 12);
	156	if (drive->media == ide_tape)
	157	rq->cmd[13] = REQ_IDETAPE_PC1;
	158	error = blk_execute_rq(drive->queue, disk, rq, 0);
	159	blk_put_request(rq);
	160
	161	return error;
	162	}
	163	EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
	164
0c8a6c7a BZ	165	int ide_do_start_stop(ide_drive_t drive, struct gendisk disk, int start)
	166	{
	167	struct ide_atapi_pc pc;
	168
	169	ide_init_pc(&pc);
	170	pc.c[0] = START_STOP;
	171	pc.c[4] = start;
	172
	173	if (drive->media == ide_tape)
	174	pc.flags \|= PC_FLAG_WAIT_FOR_DSC;
	175
	176	return ide_queue_pc_tail(drive, disk, &pc);
	177	}
	178	EXPORT_SYMBOL_GPL(ide_do_start_stop);
	179
0578042d BZ	180	int ide_set_media_lock(ide_drive_t drive, struct gendisk disk, int on)
	181	{
	182	struct ide_atapi_pc pc;
	183
	184	if (drive->atapi_flags & IDE_AFLAG_NO_DOORLOCK)
	185	return 0;
	186
	187	ide_init_pc(&pc);
	188	pc.c[0] = ALLOW_MEDIUM_REMOVAL;
	189	pc.c[4] = on;
	190
	191	return ide_queue_pc_tail(drive, disk, &pc);
	192	}
	193	EXPORT_SYMBOL_GPL(ide_set_media_lock);
	194
646c0cb6 BZ	195	/* TODO: unify the code thus making some arguments go away */
	196	ide_startstop_t ide_pc_intr(ide_drive_t drive, struct ide_atapi_pc pc,
	197	ide_handler_t handler, unsigned int timeout, ide_expiry_t expiry,
	198	void (update_buffers)(ide_drive_t , struct ide_atapi_pc *),
	199	void (retry_pc)(ide_drive_t ), void (dsc_handle)(ide_drive_t ),
acaa0f5f	200	int (io_buffers)(ide_drive_t , struct ide_atapi_pc *, unsigned, int))
646c0cb6 BZ	201	{
646c0cb6 BZ	202	ide_hwif_t *hwif = drive->hwif;
8fccf899	203	struct request *rq = hwif->hwgroup->rq;
374e042c	204	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
646c0cb6 BZ	205	xfer_func_t *xferfunc;
	206	unsigned int temp;
	207	u16 bcount;
	208	u8 stat, ireason, scsi = drive->scsi;
	209
	210	debug_log("Enter %s - interrupt handler\n", __func__);
	211
	212	if (pc->flags & PC_FLAG_TIMEDOUT) {
db9d2869	213	drive->pc_callback(drive);
646c0cb6 BZ	214	return ide_stopped;
	215	}
	216
	217	/* Clear the interrupt */
374e042c	218	stat = tp_ops->read_status(hwif);
646c0cb6 BZ	219
	220	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
	221	if (hwif->dma_ops->dma_end(drive) \|\|
3a7d2484	222	(drive->media == ide_tape && !scsi && (stat & ATA_ERR))) {
646c0cb6 BZ	223	if (drive->media == ide_floppy && !scsi)
	224	printk(KERN_ERR "%s: DMA %s error\n",
	225	drive->name, rq_data_dir(pc->rq)
	226	? "write" : "read");
	227	pc->flags \|= PC_FLAG_DMA_ERROR;
	228	} else {
	229	pc->xferred = pc->req_xfer;
	230	if (update_buffers)
	231	update_buffers(drive, pc);
	232	}
	233	debug_log("%s: DMA finished\n", drive->name);
	234	}
	235
	236	/* No more interrupts */
3a7d2484	237	if ((stat & ATA_DRQ) == 0) {
646c0cb6 BZ	238	debug_log("Packet command completed, %d bytes transferred\n",
	239	pc->xferred);
	240
	241	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
	242
	243	local_irq_enable_in_hardirq();
	244
	245	if (drive->media == ide_tape && !scsi &&
3a7d2484 BZ	246	(stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
3a7d2484 BZ	247	stat &= ~ATA_ERR;
8fccf899	248
3a7d2484	249	if ((stat & ATA_ERR) \|\| (pc->flags & PC_FLAG_DMA_ERROR)) {
646c0cb6 BZ	250	/* Error detected */
	251	debug_log("%s: I/O error\n", drive->name);
	252
	253	if (drive->media != ide_tape \|\| scsi) {
	254	pc->rq->errors++;
	255	if (scsi)
	256	goto cmd_finished;
	257	}
	258
8fccf899	259	if (rq->cmd[0] == REQUEST_SENSE) {
646c0cb6 BZ	260	printk(KERN_ERR "%s: I/O error in request sense"
	261	" command\n", drive->name);
	262	return ide_do_reset(drive);
	263	}
	264
8fccf899	265	debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
646c0cb6 BZ	266
	267	/* Retry operation */
	268	retry_pc(drive);
8fccf899	269
646c0cb6 BZ	270	/* queued, but not started */
	271	return ide_stopped;
	272	}
	273	cmd_finished:
	274	pc->error = 0;
	275	if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
3a7d2484	276	(stat & ATA_DSC) == 0) {
646c0cb6 BZ	277	dsc_handle(drive);
	278	return ide_stopped;
	279	}
8fccf899	280
646c0cb6	281	/* Command finished - Call the callback function */
db9d2869	282	drive->pc_callback(drive);
8fccf899	283
646c0cb6 BZ	284	return ide_stopped;
	285	}
	286
	287	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
	288	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
	289	printk(KERN_ERR "%s: The device wants to issue more interrupts "
	290	"in DMA mode\n", drive->name);
	291	ide_dma_off(drive);
	292	return ide_do_reset(drive);
	293	}
646c0cb6	294
1823649b BZ	295	/* Get the number of bytes to transfer on this interrupt. */
1823649b BZ	296	ide_read_bcount_and_ireason(drive, &bcount, &ireason);
646c0cb6	297
3a7d2484	298	if (ireason & ATAPI_COD) {
646c0cb6 BZ	299	printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
	300	return ide_do_reset(drive);
	301	}
8fccf899	302
3a7d2484 BZ	303	if (((ireason & ATAPI_IO) == ATAPI_IO) ==
3a7d2484 BZ	304	!!(pc->flags & PC_FLAG_WRITING)) {
646c0cb6 BZ	305	/* Hopefully, we will never get here */
	306	printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
	307	"to %s!\n", drive->name,
3a7d2484 BZ	308	(ireason & ATAPI_IO) ? "Write" : "Read",
3a7d2484 BZ	309	(ireason & ATAPI_IO) ? "Read" : "Write");
646c0cb6 BZ	310	return ide_do_reset(drive);
646c0cb6 BZ	311	}
8fccf899	312
646c0cb6 BZ	313	if (!(pc->flags & PC_FLAG_WRITING)) {
	314	/* Reading - Check that we have enough space */
	315	temp = pc->xferred + bcount;
	316	if (temp > pc->req_xfer) {
	317	if (temp > pc->buf_size) {
	318	printk(KERN_ERR "%s: The device wants to send "
	319	"us more data than expected - "
	320	"discarding data\n",
	321	drive->name);
	322	if (scsi)
	323	temp = pc->buf_size - pc->xferred;
	324	else
	325	temp = 0;
	326	if (temp) {
	327	if (pc->sg)
	328	io_buffers(drive, pc, temp, 0);
	329	else
374e042c	330	tp_ops->input_data(drive, NULL,
646c0cb6 BZ	331	pc->cur_pos, temp);
	332	printk(KERN_ERR "%s: transferred %d of "
	333	"%d bytes\n",
	334	drive->name,
	335	temp, bcount);
	336	}
	337	pc->xferred += temp;
	338	pc->cur_pos += temp;
	339	ide_pad_transfer(drive, 0, bcount - temp);
	340	ide_set_handler(drive, handler, timeout,
	341	expiry);
	342	return ide_started;
	343	}
	344	debug_log("The device wants to send us more data than "
	345	"expected - allowing transfer\n");
	346	}
374e042c	347	xferfunc = tp_ops->input_data;
646c0cb6	348	} else
374e042c	349	xferfunc = tp_ops->output_data;
646c0cb6 BZ	350
	351	if ((drive->media == ide_floppy && !scsi && !pc->buf) \|\|
	352	(drive->media == ide_tape && !scsi && pc->bh) \|\|
acaa0f5f BZ	353	(scsi && pc->sg)) {
	354	int done = io_buffers(drive, pc, bcount,
	355	!!(pc->flags & PC_FLAG_WRITING));
	356
	357	/* FIXME: don't do partial completions */
	358	if (drive->media == ide_floppy && !scsi)
	359	ide_end_request(drive, 1, done >> 9);
	360	} else
646c0cb6 BZ	361	xferfunc(drive, NULL, pc->cur_pos, bcount);
	362
	363	/* Update the current position */
	364	pc->xferred += bcount;
	365	pc->cur_pos += bcount;
	366
	367	debug_log("[cmd %x] transferred %d bytes on that intr.\n",
8fccf899	368	rq->cmd[0], bcount);
646c0cb6 BZ	369
	370	/* And set the interrupt handler again */
	371	ide_set_handler(drive, handler, timeout, expiry);
	372	return ide_started;
	373	}
	374	EXPORT_SYMBOL_GPL(ide_pc_intr);
594c16d8	375
88a72109 BZ	376	static u8 ide_read_ireason(ide_drive_t *drive)
	377	{
	378	ide_task_t task;
	379
	380	memset(&task, 0, sizeof(task));
	381	task.tf_flags = IDE_TFLAG_IN_NSECT;
	382
374e042c	383	drive->hwif->tp_ops->tf_read(drive, &task);
88a72109 BZ	384
	385	return task.tf.nsect & 3;
	386	}
	387
594c16d8 BZ	388	static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
594c16d8 BZ	389	{
594c16d8 BZ	390	int retries = 100;
594c16d8 BZ	391
3a7d2484 BZ	392	while (retries-- && ((ireason & ATAPI_COD) == 0 \|\|
3a7d2484 BZ	393	(ireason & ATAPI_IO))) {
594c16d8 BZ	394	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	395	"a packet command, retrying\n", drive->name);
	396	udelay(100);
88a72109	397	ireason = ide_read_ireason(drive);
594c16d8 BZ	398	if (retries == 0) {
	399	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	400	"a packet command, ignoring\n",
	401	drive->name);
3a7d2484 BZ	402	ireason \|= ATAPI_COD;
3a7d2484 BZ	403	ireason &= ~ATAPI_IO;
594c16d8 BZ	404	}
	405	}
	406
	407	return ireason;
	408	}
	409
	410	ide_startstop_t ide_transfer_pc(ide_drive_t drive, struct ide_atapi_pc pc,
	411	ide_handler_t *handler, unsigned int timeout,
	412	ide_expiry_t *expiry)
	413	{
	414	ide_hwif_t *hwif = drive->hwif;
8fccf899	415	struct request *rq = hwif->hwgroup->rq;
594c16d8 BZ	416	ide_startstop_t startstop;
	417	u8 ireason;
	418
3a7d2484	419	if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
594c16d8 BZ	420	printk(KERN_ERR "%s: Strange, packet command initiated yet "
	421	"DRQ isn't asserted\n", drive->name);
	422	return startstop;
	423	}
	424
88a72109	425	ireason = ide_read_ireason(drive);
594c16d8 BZ	426	if (drive->media == ide_tape && !drive->scsi)
	427	ireason = ide_wait_ireason(drive, ireason);
	428
3a7d2484	429	if ((ireason & ATAPI_COD) == 0 \|\| (ireason & ATAPI_IO)) {
594c16d8 BZ	430	printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
	431	"a packet command\n", drive->name);
	432	return ide_do_reset(drive);
	433	}
	434
	435	/* Set the interrupt routine */
	436	ide_set_handler(drive, handler, timeout, expiry);
	437
	438	/* Begin DMA, if necessary */
	439	if (pc->flags & PC_FLAG_DMA_OK) {
	440	pc->flags \|= PC_FLAG_DMA_IN_PROGRESS;
	441	hwif->dma_ops->dma_start(drive);
	442	}
	443
	444	/* Send the actual packet */
ea68d270	445	if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
8fccf899	446	hwif->tp_ops->output_data(drive, NULL, rq->cmd, 12);
594c16d8 BZ	447
	448	return ide_started;
	449	}
	450	EXPORT_SYMBOL_GPL(ide_transfer_pc);
6bf1641c BZ	451
	452	ide_startstop_t ide_issue_pc(ide_drive_t drive, struct ide_atapi_pc pc,
	453	ide_handler_t *handler, unsigned int timeout,
	454	ide_expiry_t *expiry)
	455	{
	456	ide_hwif_t *hwif = drive->hwif;
	457	u16 bcount;
	458	u8 dma = 0;
	459
	460	/* We haven't transferred any data yet */
	461	pc->xferred = 0;
	462	pc->cur_pos = pc->buf;
	463
	464	/* Request to transfer the entire buffer at once */
	465	if (drive->media == ide_tape && !drive->scsi)
	466	bcount = pc->req_xfer;
	467	else
	468	bcount = min(pc->req_xfer, 63 * 1024);
	469
	470	if (pc->flags & PC_FLAG_DMA_ERROR) {
	471	pc->flags &= ~PC_FLAG_DMA_ERROR;
	472	ide_dma_off(drive);
	473	}
	474
	475	if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) {
	476	if (drive->scsi)
	477	hwif->sg_mapped = 1;
	478	dma = !hwif->dma_ops->dma_setup(drive);
	479	if (drive->scsi)
	480	hwif->sg_mapped = 0;
	481	}
	482
	483	if (!dma)
	484	pc->flags &= ~PC_FLAG_DMA_OK;
	485
	486	ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE,
	487	bcount, dma);
	488
	489	/* Issue the packet command */
ac77ef8b	490	if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
aaaade3f	491	ide_execute_command(drive, ATA_CMD_PACKET, handler,
6bf1641c BZ	492	timeout, NULL);
	493	return ide_started;
	494	} else {
	495	ide_execute_pkt_cmd(drive);
	496	return (*handler)(drive);
	497	}
	498	}
	499	EXPORT_SYMBOL_GPL(ide_issue_pc);