[linux-2.6-block.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);

/* 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 *),
	void (*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))
		io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING));
	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
646c0cb6 BZ	64	/* TODO: unify the code thus making some arguments go away */
	65	ide_startstop_t ide_pc_intr(ide_drive_t drive, struct ide_atapi_pc pc,
	66	ide_handler_t handler, unsigned int timeout, ide_expiry_t expiry,
	67	void (update_buffers)(ide_drive_t , struct ide_atapi_pc *),
	68	void (retry_pc)(ide_drive_t ), void (dsc_handle)(ide_drive_t ),
	69	void (io_buffers)(ide_drive_t , struct ide_atapi_pc *, unsigned, int))
	70	{
	71	ide_hwif_t *hwif = drive->hwif;
8fccf899	72	struct request *rq = hwif->hwgroup->rq;
374e042c	73	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
646c0cb6 BZ	74	xfer_func_t *xferfunc;
	75	unsigned int temp;
	76	u16 bcount;
	77	u8 stat, ireason, scsi = drive->scsi;
	78
	79	debug_log("Enter %s - interrupt handler\n", __func__);
	80
	81	if (pc->flags & PC_FLAG_TIMEDOUT) {
db9d2869	82	drive->pc_callback(drive);
646c0cb6 BZ	83	return ide_stopped;
	84	}
	85
	86	/* Clear the interrupt */
374e042c	87	stat = tp_ops->read_status(hwif);
646c0cb6 BZ	88
	89	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
	90	if (hwif->dma_ops->dma_end(drive) \|\|
3a7d2484	91	(drive->media == ide_tape && !scsi && (stat & ATA_ERR))) {
646c0cb6 BZ	92	if (drive->media == ide_floppy && !scsi)
	93	printk(KERN_ERR "%s: DMA %s error\n",
	94	drive->name, rq_data_dir(pc->rq)
	95	? "write" : "read");
	96	pc->flags \|= PC_FLAG_DMA_ERROR;
	97	} else {
	98	pc->xferred = pc->req_xfer;
	99	if (update_buffers)
	100	update_buffers(drive, pc);
	101	}
	102	debug_log("%s: DMA finished\n", drive->name);
	103	}
	104
	105	/* No more interrupts */
3a7d2484	106	if ((stat & ATA_DRQ) == 0) {
646c0cb6 BZ	107	debug_log("Packet command completed, %d bytes transferred\n",
	108	pc->xferred);
	109
	110	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
	111
	112	local_irq_enable_in_hardirq();
	113
	114	if (drive->media == ide_tape && !scsi &&
3a7d2484 BZ	115	(stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
3a7d2484 BZ	116	stat &= ~ATA_ERR;
8fccf899	117
3a7d2484	118	if ((stat & ATA_ERR) \|\| (pc->flags & PC_FLAG_DMA_ERROR)) {
646c0cb6 BZ	119	/* Error detected */
	120	debug_log("%s: I/O error\n", drive->name);
	121
	122	if (drive->media != ide_tape \|\| scsi) {
	123	pc->rq->errors++;
	124	if (scsi)
	125	goto cmd_finished;
	126	}
	127
8fccf899	128	if (rq->cmd[0] == REQUEST_SENSE) {
646c0cb6 BZ	129	printk(KERN_ERR "%s: I/O error in request sense"
	130	" command\n", drive->name);
	131	return ide_do_reset(drive);
	132	}
	133
8fccf899	134	debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
646c0cb6 BZ	135
	136	/* Retry operation */
	137	retry_pc(drive);
8fccf899	138
646c0cb6 BZ	139	/* queued, but not started */
	140	return ide_stopped;
	141	}
	142	cmd_finished:
	143	pc->error = 0;
	144	if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
3a7d2484	145	(stat & ATA_DSC) == 0) {
646c0cb6 BZ	146	dsc_handle(drive);
	147	return ide_stopped;
	148	}
8fccf899	149
646c0cb6	150	/* Command finished - Call the callback function */
db9d2869	151	drive->pc_callback(drive);
8fccf899	152
646c0cb6 BZ	153	return ide_stopped;
	154	}
	155
	156	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
	157	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
	158	printk(KERN_ERR "%s: The device wants to issue more interrupts "
	159	"in DMA mode\n", drive->name);
	160	ide_dma_off(drive);
	161	return ide_do_reset(drive);
	162	}
646c0cb6	163
1823649b BZ	164	/* Get the number of bytes to transfer on this interrupt. */
1823649b BZ	165	ide_read_bcount_and_ireason(drive, &bcount, &ireason);
646c0cb6	166
3a7d2484	167	if (ireason & ATAPI_COD) {
646c0cb6 BZ	168	printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
	169	return ide_do_reset(drive);
	170	}
8fccf899	171
3a7d2484 BZ	172	if (((ireason & ATAPI_IO) == ATAPI_IO) ==
3a7d2484 BZ	173	!!(pc->flags & PC_FLAG_WRITING)) {
646c0cb6 BZ	174	/* Hopefully, we will never get here */
	175	printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
	176	"to %s!\n", drive->name,
3a7d2484 BZ	177	(ireason & ATAPI_IO) ? "Write" : "Read",
3a7d2484 BZ	178	(ireason & ATAPI_IO) ? "Read" : "Write");
646c0cb6 BZ	179	return ide_do_reset(drive);
646c0cb6 BZ	180	}
8fccf899	181
646c0cb6 BZ	182	if (!(pc->flags & PC_FLAG_WRITING)) {
	183	/* Reading - Check that we have enough space */
	184	temp = pc->xferred + bcount;
	185	if (temp > pc->req_xfer) {
	186	if (temp > pc->buf_size) {
	187	printk(KERN_ERR "%s: The device wants to send "
	188	"us more data than expected - "
	189	"discarding data\n",
	190	drive->name);
	191	if (scsi)
	192	temp = pc->buf_size - pc->xferred;
	193	else
	194	temp = 0;
	195	if (temp) {
	196	if (pc->sg)
	197	io_buffers(drive, pc, temp, 0);
	198	else
374e042c	199	tp_ops->input_data(drive, NULL,
646c0cb6 BZ	200	pc->cur_pos, temp);
	201	printk(KERN_ERR "%s: transferred %d of "
	202	"%d bytes\n",
	203	drive->name,
	204	temp, bcount);
	205	}
	206	pc->xferred += temp;
	207	pc->cur_pos += temp;
	208	ide_pad_transfer(drive, 0, bcount - temp);
	209	ide_set_handler(drive, handler, timeout,
	210	expiry);
	211	return ide_started;
	212	}
	213	debug_log("The device wants to send us more data than "
	214	"expected - allowing transfer\n");
	215	}
374e042c	216	xferfunc = tp_ops->input_data;
646c0cb6	217	} else
374e042c	218	xferfunc = tp_ops->output_data;
646c0cb6 BZ	219
	220	if ((drive->media == ide_floppy && !scsi && !pc->buf) \|\|
	221	(drive->media == ide_tape && !scsi && pc->bh) \|\|
	222	(scsi && pc->sg))
	223	io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING));
	224	else
	225	xferfunc(drive, NULL, pc->cur_pos, bcount);
	226
	227	/* Update the current position */
	228	pc->xferred += bcount;
	229	pc->cur_pos += bcount;
	230
	231	debug_log("[cmd %x] transferred %d bytes on that intr.\n",
8fccf899	232	rq->cmd[0], bcount);
646c0cb6 BZ	233
	234	/* And set the interrupt handler again */
	235	ide_set_handler(drive, handler, timeout, expiry);
	236	return ide_started;
	237	}
	238	EXPORT_SYMBOL_GPL(ide_pc_intr);
594c16d8	239
88a72109 BZ	240	static u8 ide_read_ireason(ide_drive_t *drive)
	241	{
	242	ide_task_t task;
	243
	244	memset(&task, 0, sizeof(task));
	245	task.tf_flags = IDE_TFLAG_IN_NSECT;
	246
374e042c	247	drive->hwif->tp_ops->tf_read(drive, &task);
88a72109 BZ	248
	249	return task.tf.nsect & 3;
	250	}
	251
594c16d8 BZ	252	static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
594c16d8 BZ	253	{
594c16d8 BZ	254	int retries = 100;
594c16d8 BZ	255
3a7d2484 BZ	256	while (retries-- && ((ireason & ATAPI_COD) == 0 \|\|
3a7d2484 BZ	257	(ireason & ATAPI_IO))) {
594c16d8 BZ	258	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	259	"a packet command, retrying\n", drive->name);
	260	udelay(100);
88a72109	261	ireason = ide_read_ireason(drive);
594c16d8 BZ	262	if (retries == 0) {
	263	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	264	"a packet command, ignoring\n",
	265	drive->name);
3a7d2484 BZ	266	ireason \|= ATAPI_COD;
3a7d2484 BZ	267	ireason &= ~ATAPI_IO;
594c16d8 BZ	268	}
	269	}
	270
	271	return ireason;
	272	}
	273
	274	ide_startstop_t ide_transfer_pc(ide_drive_t drive, struct ide_atapi_pc pc,
	275	ide_handler_t *handler, unsigned int timeout,
	276	ide_expiry_t *expiry)
	277	{
	278	ide_hwif_t *hwif = drive->hwif;
8fccf899	279	struct request *rq = hwif->hwgroup->rq;
594c16d8 BZ	280	ide_startstop_t startstop;
	281	u8 ireason;
	282
3a7d2484	283	if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
594c16d8 BZ	284	printk(KERN_ERR "%s: Strange, packet command initiated yet "
	285	"DRQ isn't asserted\n", drive->name);
	286	return startstop;
	287	}
	288
88a72109	289	ireason = ide_read_ireason(drive);
594c16d8 BZ	290	if (drive->media == ide_tape && !drive->scsi)
	291	ireason = ide_wait_ireason(drive, ireason);
	292
3a7d2484	293	if ((ireason & ATAPI_COD) == 0 \|\| (ireason & ATAPI_IO)) {
594c16d8 BZ	294	printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
	295	"a packet command\n", drive->name);
	296	return ide_do_reset(drive);
	297	}
	298
	299	/* Set the interrupt routine */
	300	ide_set_handler(drive, handler, timeout, expiry);
	301
	302	/* Begin DMA, if necessary */
	303	if (pc->flags & PC_FLAG_DMA_OK) {
	304	pc->flags \|= PC_FLAG_DMA_IN_PROGRESS;
	305	hwif->dma_ops->dma_start(drive);
	306	}
	307
	308	/* Send the actual packet */
ea68d270	309	if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
8fccf899	310	hwif->tp_ops->output_data(drive, NULL, rq->cmd, 12);
594c16d8 BZ	311
	312	return ide_started;
	313	}
	314	EXPORT_SYMBOL_GPL(ide_transfer_pc);
6bf1641c BZ	315
	316	ide_startstop_t ide_issue_pc(ide_drive_t drive, struct ide_atapi_pc pc,
	317	ide_handler_t *handler, unsigned int timeout,
	318	ide_expiry_t *expiry)
	319	{
	320	ide_hwif_t *hwif = drive->hwif;
	321	u16 bcount;
	322	u8 dma = 0;
	323
	324	/* We haven't transferred any data yet */
	325	pc->xferred = 0;
	326	pc->cur_pos = pc->buf;
	327
	328	/* Request to transfer the entire buffer at once */
	329	if (drive->media == ide_tape && !drive->scsi)
	330	bcount = pc->req_xfer;
	331	else
	332	bcount = min(pc->req_xfer, 63 * 1024);
	333
	334	if (pc->flags & PC_FLAG_DMA_ERROR) {
	335	pc->flags &= ~PC_FLAG_DMA_ERROR;
	336	ide_dma_off(drive);
	337	}
	338
	339	if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) {
	340	if (drive->scsi)
	341	hwif->sg_mapped = 1;
	342	dma = !hwif->dma_ops->dma_setup(drive);
	343	if (drive->scsi)
	344	hwif->sg_mapped = 0;
	345	}
	346
	347	if (!dma)
	348	pc->flags &= ~PC_FLAG_DMA_OK;
	349
	350	ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE,
	351	bcount, dma);
	352
	353	/* Issue the packet command */
ac77ef8b	354	if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
aaaade3f	355	ide_execute_command(drive, ATA_CMD_PACKET, handler,
6bf1641c BZ	356	timeout, NULL);
	357	return ide_started;
	358	} else {
	359	ide_execute_pkt_cmd(drive);
	360	return (*handler)(drive);
	361	}
	362	}
	363	EXPORT_SYMBOL_GPL(ide_issue_pc);