[deliverable/linux.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);

/* 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
646c0cb6 BZ	122	/* TODO: unify the code thus making some arguments go away */
	123	ide_startstop_t ide_pc_intr(ide_drive_t drive, struct ide_atapi_pc pc,
	124	ide_handler_t handler, unsigned int timeout, ide_expiry_t expiry,
	125	void (update_buffers)(ide_drive_t , struct ide_atapi_pc *),
	126	void (retry_pc)(ide_drive_t ), void (dsc_handle)(ide_drive_t ),
acaa0f5f	127	int (io_buffers)(ide_drive_t , struct ide_atapi_pc *, unsigned, int))
646c0cb6 BZ	128	{
646c0cb6 BZ	129	ide_hwif_t *hwif = drive->hwif;
8fccf899	130	struct request *rq = hwif->hwgroup->rq;
374e042c	131	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
646c0cb6 BZ	132	xfer_func_t *xferfunc;
	133	unsigned int temp;
	134	u16 bcount;
	135	u8 stat, ireason, scsi = drive->scsi;
	136
	137	debug_log("Enter %s - interrupt handler\n", __func__);
	138
	139	if (pc->flags & PC_FLAG_TIMEDOUT) {
db9d2869	140	drive->pc_callback(drive);
646c0cb6 BZ	141	return ide_stopped;
	142	}
	143
	144	/* Clear the interrupt */
374e042c	145	stat = tp_ops->read_status(hwif);
646c0cb6 BZ	146
	147	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
	148	if (hwif->dma_ops->dma_end(drive) \|\|
3a7d2484	149	(drive->media == ide_tape && !scsi && (stat & ATA_ERR))) {
646c0cb6 BZ	150	if (drive->media == ide_floppy && !scsi)
	151	printk(KERN_ERR "%s: DMA %s error\n",
	152	drive->name, rq_data_dir(pc->rq)
	153	? "write" : "read");
	154	pc->flags \|= PC_FLAG_DMA_ERROR;
	155	} else {
	156	pc->xferred = pc->req_xfer;
	157	if (update_buffers)
	158	update_buffers(drive, pc);
	159	}
	160	debug_log("%s: DMA finished\n", drive->name);
	161	}
	162
	163	/* No more interrupts */
3a7d2484	164	if ((stat & ATA_DRQ) == 0) {
646c0cb6 BZ	165	debug_log("Packet command completed, %d bytes transferred\n",
	166	pc->xferred);
	167
	168	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
	169
	170	local_irq_enable_in_hardirq();
	171
	172	if (drive->media == ide_tape && !scsi &&
3a7d2484 BZ	173	(stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
3a7d2484 BZ	174	stat &= ~ATA_ERR;
8fccf899	175
3a7d2484	176	if ((stat & ATA_ERR) \|\| (pc->flags & PC_FLAG_DMA_ERROR)) {
646c0cb6 BZ	177	/* Error detected */
	178	debug_log("%s: I/O error\n", drive->name);
	179
	180	if (drive->media != ide_tape \|\| scsi) {
	181	pc->rq->errors++;
	182	if (scsi)
	183	goto cmd_finished;
	184	}
	185
8fccf899	186	if (rq->cmd[0] == REQUEST_SENSE) {
646c0cb6 BZ	187	printk(KERN_ERR "%s: I/O error in request sense"
	188	" command\n", drive->name);
	189	return ide_do_reset(drive);
	190	}
	191
8fccf899	192	debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
646c0cb6 BZ	193
	194	/* Retry operation */
	195	retry_pc(drive);
8fccf899	196
646c0cb6 BZ	197	/* queued, but not started */
	198	return ide_stopped;
	199	}
	200	cmd_finished:
	201	pc->error = 0;
	202	if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
3a7d2484	203	(stat & ATA_DSC) == 0) {
646c0cb6 BZ	204	dsc_handle(drive);
	205	return ide_stopped;
	206	}
8fccf899	207
646c0cb6	208	/* Command finished - Call the callback function */
db9d2869	209	drive->pc_callback(drive);
8fccf899	210
646c0cb6 BZ	211	return ide_stopped;
	212	}
	213
	214	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
	215	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
	216	printk(KERN_ERR "%s: The device wants to issue more interrupts "
	217	"in DMA mode\n", drive->name);
	218	ide_dma_off(drive);
	219	return ide_do_reset(drive);
	220	}
646c0cb6	221
1823649b BZ	222	/* Get the number of bytes to transfer on this interrupt. */
1823649b BZ	223	ide_read_bcount_and_ireason(drive, &bcount, &ireason);
646c0cb6	224
3a7d2484	225	if (ireason & ATAPI_COD) {
646c0cb6 BZ	226	printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
	227	return ide_do_reset(drive);
	228	}
8fccf899	229
3a7d2484 BZ	230	if (((ireason & ATAPI_IO) == ATAPI_IO) ==
3a7d2484 BZ	231	!!(pc->flags & PC_FLAG_WRITING)) {
646c0cb6 BZ	232	/* Hopefully, we will never get here */
	233	printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
	234	"to %s!\n", drive->name,
3a7d2484 BZ	235	(ireason & ATAPI_IO) ? "Write" : "Read",
3a7d2484 BZ	236	(ireason & ATAPI_IO) ? "Read" : "Write");
646c0cb6 BZ	237	return ide_do_reset(drive);
646c0cb6 BZ	238	}
8fccf899	239
646c0cb6 BZ	240	if (!(pc->flags & PC_FLAG_WRITING)) {
	241	/* Reading - Check that we have enough space */
	242	temp = pc->xferred + bcount;
	243	if (temp > pc->req_xfer) {
	244	if (temp > pc->buf_size) {
	245	printk(KERN_ERR "%s: The device wants to send "
	246	"us more data than expected - "
	247	"discarding data\n",
	248	drive->name);
	249	if (scsi)
	250	temp = pc->buf_size - pc->xferred;
	251	else
	252	temp = 0;
	253	if (temp) {
	254	if (pc->sg)
	255	io_buffers(drive, pc, temp, 0);
	256	else
374e042c	257	tp_ops->input_data(drive, NULL,
646c0cb6 BZ	258	pc->cur_pos, temp);
	259	printk(KERN_ERR "%s: transferred %d of "
	260	"%d bytes\n",
	261	drive->name,
	262	temp, bcount);
	263	}
	264	pc->xferred += temp;
	265	pc->cur_pos += temp;
	266	ide_pad_transfer(drive, 0, bcount - temp);
	267	ide_set_handler(drive, handler, timeout,
	268	expiry);
	269	return ide_started;
	270	}
	271	debug_log("The device wants to send us more data than "
	272	"expected - allowing transfer\n");
	273	}
374e042c	274	xferfunc = tp_ops->input_data;
646c0cb6	275	} else
374e042c	276	xferfunc = tp_ops->output_data;
646c0cb6 BZ	277
	278	if ((drive->media == ide_floppy && !scsi && !pc->buf) \|\|
	279	(drive->media == ide_tape && !scsi && pc->bh) \|\|
acaa0f5f BZ	280	(scsi && pc->sg)) {
	281	int done = io_buffers(drive, pc, bcount,
	282	!!(pc->flags & PC_FLAG_WRITING));
	283
	284	/* FIXME: don't do partial completions */
	285	if (drive->media == ide_floppy && !scsi)
	286	ide_end_request(drive, 1, done >> 9);
	287	} else
646c0cb6 BZ	288	xferfunc(drive, NULL, pc->cur_pos, bcount);
	289
	290	/* Update the current position */
	291	pc->xferred += bcount;
	292	pc->cur_pos += bcount;
	293
	294	debug_log("[cmd %x] transferred %d bytes on that intr.\n",
8fccf899	295	rq->cmd[0], bcount);
646c0cb6 BZ	296
	297	/* And set the interrupt handler again */
	298	ide_set_handler(drive, handler, timeout, expiry);
	299	return ide_started;
	300	}
	301	EXPORT_SYMBOL_GPL(ide_pc_intr);
594c16d8	302
88a72109 BZ	303	static u8 ide_read_ireason(ide_drive_t *drive)
	304	{
	305	ide_task_t task;
	306
	307	memset(&task, 0, sizeof(task));
	308	task.tf_flags = IDE_TFLAG_IN_NSECT;
	309
374e042c	310	drive->hwif->tp_ops->tf_read(drive, &task);
88a72109 BZ	311
	312	return task.tf.nsect & 3;
	313	}
	314
594c16d8 BZ	315	static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
594c16d8 BZ	316	{
594c16d8 BZ	317	int retries = 100;
594c16d8 BZ	318
3a7d2484 BZ	319	while (retries-- && ((ireason & ATAPI_COD) == 0 \|\|
3a7d2484 BZ	320	(ireason & ATAPI_IO))) {
594c16d8 BZ	321	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	322	"a packet command, retrying\n", drive->name);
	323	udelay(100);
88a72109	324	ireason = ide_read_ireason(drive);
594c16d8 BZ	325	if (retries == 0) {
	326	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	327	"a packet command, ignoring\n",
	328	drive->name);
3a7d2484 BZ	329	ireason \|= ATAPI_COD;
3a7d2484 BZ	330	ireason &= ~ATAPI_IO;
594c16d8 BZ	331	}
	332	}
	333
	334	return ireason;
	335	}
	336
	337	ide_startstop_t ide_transfer_pc(ide_drive_t drive, struct ide_atapi_pc pc,
	338	ide_handler_t *handler, unsigned int timeout,
	339	ide_expiry_t *expiry)
	340	{
	341	ide_hwif_t *hwif = drive->hwif;
8fccf899	342	struct request *rq = hwif->hwgroup->rq;
594c16d8 BZ	343	ide_startstop_t startstop;
	344	u8 ireason;
	345
3a7d2484	346	if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
594c16d8 BZ	347	printk(KERN_ERR "%s: Strange, packet command initiated yet "
	348	"DRQ isn't asserted\n", drive->name);
	349	return startstop;
	350	}
	351
88a72109	352	ireason = ide_read_ireason(drive);
594c16d8 BZ	353	if (drive->media == ide_tape && !drive->scsi)
	354	ireason = ide_wait_ireason(drive, ireason);
	355
3a7d2484	356	if ((ireason & ATAPI_COD) == 0 \|\| (ireason & ATAPI_IO)) {
594c16d8 BZ	357	printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
	358	"a packet command\n", drive->name);
	359	return ide_do_reset(drive);
	360	}
	361
	362	/* Set the interrupt routine */
	363	ide_set_handler(drive, handler, timeout, expiry);
	364
	365	/* Begin DMA, if necessary */
	366	if (pc->flags & PC_FLAG_DMA_OK) {
	367	pc->flags \|= PC_FLAG_DMA_IN_PROGRESS;
	368	hwif->dma_ops->dma_start(drive);
	369	}
	370
	371	/* Send the actual packet */
ea68d270	372	if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
8fccf899	373	hwif->tp_ops->output_data(drive, NULL, rq->cmd, 12);
594c16d8 BZ	374
	375	return ide_started;
	376	}
	377	EXPORT_SYMBOL_GPL(ide_transfer_pc);
6bf1641c BZ	378
	379	ide_startstop_t ide_issue_pc(ide_drive_t drive, struct ide_atapi_pc pc,
	380	ide_handler_t *handler, unsigned int timeout,
	381	ide_expiry_t *expiry)
	382	{
	383	ide_hwif_t *hwif = drive->hwif;
	384	u16 bcount;
	385	u8 dma = 0;
	386
	387	/* We haven't transferred any data yet */
	388	pc->xferred = 0;
	389	pc->cur_pos = pc->buf;
	390
	391	/* Request to transfer the entire buffer at once */
	392	if (drive->media == ide_tape && !drive->scsi)
	393	bcount = pc->req_xfer;
	394	else
	395	bcount = min(pc->req_xfer, 63 * 1024);
	396
	397	if (pc->flags & PC_FLAG_DMA_ERROR) {
	398	pc->flags &= ~PC_FLAG_DMA_ERROR;
	399	ide_dma_off(drive);
	400	}
	401
	402	if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) {
	403	if (drive->scsi)
	404	hwif->sg_mapped = 1;
	405	dma = !hwif->dma_ops->dma_setup(drive);
	406	if (drive->scsi)
	407	hwif->sg_mapped = 0;
	408	}
	409
	410	if (!dma)
	411	pc->flags &= ~PC_FLAG_DMA_OK;
	412
	413	ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE,
	414	bcount, dma);
	415
	416	/* Issue the packet command */
ac77ef8b	417	if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
aaaade3f	418	ide_execute_command(drive, ATA_CMD_PACKET, handler,
6bf1641c BZ	419	timeout, NULL);
	420	return ide_started;
	421	} else {
	422	ide_execute_pkt_cmd(drive);
	423	return (*handler)(drive);
	424	}
	425	}
	426	EXPORT_SYMBOL_GPL(ide_issue_pc);