[net-next-2.6.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

/* 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;
	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 & ERR_STAT))) {
			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 & DRQ_STAT) == 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 & ERR_STAT) && pc->c[0] == REQUEST_SENSE)
			stat &= ~ERR_STAT;
		if ((stat & ERR_STAT) || (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 (pc->c[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", pc->c[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 & SEEK_STAT) == 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 & CD) {
		printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
		return ide_do_reset(drive);
	}
	if (((ireason & IO) == 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 & IO) ? "Write" : "Read",
				(ireason & 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",
		  pc->c[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 & CD) == 0 || (ireason & 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 |= CD;
			ireason &= ~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;
	ide_startstop_t startstop;
	u8 ireason;

	if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, 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 & CD) == 0 || (ireason & 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 ((pc->flags & PC_FLAG_ZIP_DRIVE) == 0)
		hwif->tp_ops->output_data(drive, NULL, pc->c, 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 (pc->flags & PC_FLAG_DRQ_INTERRUPT) {
		ide_execute_command(drive, WIN_PACKETCMD, 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
	17	/* TODO: unify the code thus making some arguments go away */
	18	ide_startstop_t ide_pc_intr(ide_drive_t drive, struct ide_atapi_pc pc,
	19	ide_handler_t handler, unsigned int timeout, ide_expiry_t expiry,
	20	void (update_buffers)(ide_drive_t , struct ide_atapi_pc *),
	21	void (retry_pc)(ide_drive_t ), void (dsc_handle)(ide_drive_t ),
	22	void (io_buffers)(ide_drive_t , struct ide_atapi_pc *, unsigned, int))
	23	{
	24	ide_hwif_t *hwif = drive->hwif;
374e042c	25	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
646c0cb6 BZ	26	xfer_func_t *xferfunc;
	27	unsigned int temp;
	28	u16 bcount;
	29	u8 stat, ireason, scsi = drive->scsi;
	30
	31	debug_log("Enter %s - interrupt handler\n", __func__);
	32
	33	if (pc->flags & PC_FLAG_TIMEDOUT) {
db9d2869	34	drive->pc_callback(drive);
646c0cb6 BZ	35	return ide_stopped;
	36	}
	37
	38	/* Clear the interrupt */
374e042c	39	stat = tp_ops->read_status(hwif);
646c0cb6 BZ	40
	41	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
	42	if (hwif->dma_ops->dma_end(drive) \|\|
	43	(drive->media == ide_tape && !scsi && (stat & ERR_STAT))) {
	44	if (drive->media == ide_floppy && !scsi)
	45	printk(KERN_ERR "%s: DMA %s error\n",
	46	drive->name, rq_data_dir(pc->rq)
	47	? "write" : "read");
	48	pc->flags \|= PC_FLAG_DMA_ERROR;
	49	} else {
	50	pc->xferred = pc->req_xfer;
	51	if (update_buffers)
	52	update_buffers(drive, pc);
	53	}
	54	debug_log("%s: DMA finished\n", drive->name);
	55	}
	56
	57	/* No more interrupts */
	58	if ((stat & DRQ_STAT) == 0) {
	59	debug_log("Packet command completed, %d bytes transferred\n",
	60	pc->xferred);
	61
	62	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
	63
	64	local_irq_enable_in_hardirq();
	65
	66	if (drive->media == ide_tape && !scsi &&
	67	(stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE)
	68	stat &= ~ERR_STAT;
	69	if ((stat & ERR_STAT) \|\| (pc->flags & PC_FLAG_DMA_ERROR)) {
	70	/* Error detected */
	71	debug_log("%s: I/O error\n", drive->name);
	72
	73	if (drive->media != ide_tape \|\| scsi) {
	74	pc->rq->errors++;
	75	if (scsi)
	76	goto cmd_finished;
	77	}
	78
	79	if (pc->c[0] == REQUEST_SENSE) {
	80	printk(KERN_ERR "%s: I/O error in request sense"
	81	" command\n", drive->name);
	82	return ide_do_reset(drive);
	83	}
	84
	85	debug_log("[cmd %x]: check condition\n", pc->c[0]);
	86
	87	/* Retry operation */
	88	retry_pc(drive);
	89	/* queued, but not started */
	90	return ide_stopped;
	91	}
	92	cmd_finished:
	93	pc->error = 0;
	94	if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
	95	(stat & SEEK_STAT) == 0) {
	96	dsc_handle(drive);
	97	return ide_stopped;
	98	}
	99	/* Command finished - Call the callback function */
db9d2869	100	drive->pc_callback(drive);
646c0cb6 BZ	101	return ide_stopped;
	102	}
	103
	104	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
	105	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
	106	printk(KERN_ERR "%s: The device wants to issue more interrupts "
	107	"in DMA mode\n", drive->name);
	108	ide_dma_off(drive);
	109	return ide_do_reset(drive);
	110	}
646c0cb6	111
1823649b BZ	112	/* Get the number of bytes to transfer on this interrupt. */
1823649b BZ	113	ide_read_bcount_and_ireason(drive, &bcount, &ireason);
646c0cb6 BZ	114
	115	if (ireason & CD) {
	116	printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
	117	return ide_do_reset(drive);
	118	}
	119	if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
	120	/* Hopefully, we will never get here */
	121	printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
	122	"to %s!\n", drive->name,
	123	(ireason & IO) ? "Write" : "Read",
	124	(ireason & IO) ? "Read" : "Write");
	125	return ide_do_reset(drive);
	126	}
	127	if (!(pc->flags & PC_FLAG_WRITING)) {
	128	/* Reading - Check that we have enough space */
	129	temp = pc->xferred + bcount;
	130	if (temp > pc->req_xfer) {
	131	if (temp > pc->buf_size) {
	132	printk(KERN_ERR "%s: The device wants to send "
	133	"us more data than expected - "
	134	"discarding data\n",
	135	drive->name);
	136	if (scsi)
	137	temp = pc->buf_size - pc->xferred;
	138	else
	139	temp = 0;
	140	if (temp) {
	141	if (pc->sg)
	142	io_buffers(drive, pc, temp, 0);
	143	else
374e042c	144	tp_ops->input_data(drive, NULL,
646c0cb6 BZ	145	pc->cur_pos, temp);
	146	printk(KERN_ERR "%s: transferred %d of "
	147	"%d bytes\n",
	148	drive->name,
	149	temp, bcount);
	150	}
	151	pc->xferred += temp;
	152	pc->cur_pos += temp;
	153	ide_pad_transfer(drive, 0, bcount - temp);
	154	ide_set_handler(drive, handler, timeout,
	155	expiry);
	156	return ide_started;
	157	}
	158	debug_log("The device wants to send us more data than "
	159	"expected - allowing transfer\n");
	160	}
374e042c	161	xferfunc = tp_ops->input_data;
646c0cb6	162	} else
374e042c	163	xferfunc = tp_ops->output_data;
646c0cb6 BZ	164
	165	if ((drive->media == ide_floppy && !scsi && !pc->buf) \|\|
	166	(drive->media == ide_tape && !scsi && pc->bh) \|\|
	167	(scsi && pc->sg))
	168	io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING));
	169	else
	170	xferfunc(drive, NULL, pc->cur_pos, bcount);
	171
	172	/* Update the current position */
	173	pc->xferred += bcount;
	174	pc->cur_pos += bcount;
	175
	176	debug_log("[cmd %x] transferred %d bytes on that intr.\n",
	177	pc->c[0], bcount);
	178
	179	/* And set the interrupt handler again */
	180	ide_set_handler(drive, handler, timeout, expiry);
	181	return ide_started;
	182	}
	183	EXPORT_SYMBOL_GPL(ide_pc_intr);
594c16d8	184
88a72109 BZ	185	static u8 ide_read_ireason(ide_drive_t *drive)
	186	{
	187	ide_task_t task;
	188
	189	memset(&task, 0, sizeof(task));
	190	task.tf_flags = IDE_TFLAG_IN_NSECT;
	191
374e042c	192	drive->hwif->tp_ops->tf_read(drive, &task);
88a72109 BZ	193
	194	return task.tf.nsect & 3;
	195	}
	196
594c16d8 BZ	197	static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
594c16d8 BZ	198	{
594c16d8 BZ	199	int retries = 100;
	200
	201	while (retries-- && ((ireason & CD) == 0 \|\| (ireason & IO))) {
	202	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	203	"a packet command, retrying\n", drive->name);
	204	udelay(100);
88a72109	205	ireason = ide_read_ireason(drive);
594c16d8 BZ	206	if (retries == 0) {
	207	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	208	"a packet command, ignoring\n",
	209	drive->name);
	210	ireason \|= CD;
	211	ireason &= ~IO;
	212	}
	213	}
	214
	215	return ireason;
	216	}
	217
	218	ide_startstop_t ide_transfer_pc(ide_drive_t drive, struct ide_atapi_pc pc,
	219	ide_handler_t *handler, unsigned int timeout,
	220	ide_expiry_t *expiry)
	221	{
	222	ide_hwif_t *hwif = drive->hwif;
	223	ide_startstop_t startstop;
	224	u8 ireason;
	225
	226	if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
	227	printk(KERN_ERR "%s: Strange, packet command initiated yet "
	228	"DRQ isn't asserted\n", drive->name);
	229	return startstop;
	230	}
	231
88a72109	232	ireason = ide_read_ireason(drive);
594c16d8 BZ	233	if (drive->media == ide_tape && !drive->scsi)
	234	ireason = ide_wait_ireason(drive, ireason);
	235
	236	if ((ireason & CD) == 0 \|\| (ireason & IO)) {
	237	printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
	238	"a packet command\n", drive->name);
	239	return ide_do_reset(drive);
	240	}
	241
	242	/* Set the interrupt routine */
	243	ide_set_handler(drive, handler, timeout, expiry);
	244
	245	/* Begin DMA, if necessary */
	246	if (pc->flags & PC_FLAG_DMA_OK) {
	247	pc->flags \|= PC_FLAG_DMA_IN_PROGRESS;
	248	hwif->dma_ops->dma_start(drive);
	249	}
	250
	251	/* Send the actual packet */
	252	if ((pc->flags & PC_FLAG_ZIP_DRIVE) == 0)
374e042c	253	hwif->tp_ops->output_data(drive, NULL, pc->c, 12);
594c16d8 BZ	254
	255	return ide_started;
	256	}
	257	EXPORT_SYMBOL_GPL(ide_transfer_pc);
6bf1641c BZ	258
	259	ide_startstop_t ide_issue_pc(ide_drive_t drive, struct ide_atapi_pc pc,
	260	ide_handler_t *handler, unsigned int timeout,
	261	ide_expiry_t *expiry)
	262	{
	263	ide_hwif_t *hwif = drive->hwif;
	264	u16 bcount;
	265	u8 dma = 0;
	266
	267	/* We haven't transferred any data yet */
	268	pc->xferred = 0;
	269	pc->cur_pos = pc->buf;
	270
	271	/* Request to transfer the entire buffer at once */
	272	if (drive->media == ide_tape && !drive->scsi)
	273	bcount = pc->req_xfer;
	274	else
	275	bcount = min(pc->req_xfer, 63 * 1024);
	276
	277	if (pc->flags & PC_FLAG_DMA_ERROR) {
	278	pc->flags &= ~PC_FLAG_DMA_ERROR;
	279	ide_dma_off(drive);
	280	}
	281
	282	if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) {
	283	if (drive->scsi)
	284	hwif->sg_mapped = 1;
	285	dma = !hwif->dma_ops->dma_setup(drive);
	286	if (drive->scsi)
	287	hwif->sg_mapped = 0;
	288	}
	289
	290	if (!dma)
	291	pc->flags &= ~PC_FLAG_DMA_OK;
	292
	293	ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE,
	294	bcount, dma);
	295
	296	/* Issue the packet command */
	297	if (pc->flags & PC_FLAG_DRQ_INTERRUPT) {
	298	ide_execute_command(drive, WIN_PACKETCMD, handler,
	299	timeout, NULL);
	300	return ide_started;
	301	} else {
	302	ide_execute_pkt_cmd(drive);
	303	return (*handler)(drive);
	304	}
	305	}
	306	EXPORT_SYMBOL_GPL(ide_issue_pc);