[mirror_ubuntu-artful-kernel.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) {
		if (drive->media == ide_floppy || drive->media == ide_tape)
			drive->pc_callback(drive);
		else
			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 */
		if (drive->media == ide_floppy || drive->media == ide_tape)
			drive->pc_callback(drive);
		else
			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) {
776bb027	34	if (drive->media == ide_floppy \|\| drive->media == ide_tape)
2207fa5a BP	35	drive->pc_callback(drive);
	36	else
	37	pc->callback(drive);
646c0cb6 BZ	38	return ide_stopped;
	39	}
	40
	41	/* Clear the interrupt */
374e042c	42	stat = tp_ops->read_status(hwif);
646c0cb6 BZ	43
	44	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
	45	if (hwif->dma_ops->dma_end(drive) \|\|
	46	(drive->media == ide_tape && !scsi && (stat & ERR_STAT))) {
	47	if (drive->media == ide_floppy && !scsi)
	48	printk(KERN_ERR "%s: DMA %s error\n",
	49	drive->name, rq_data_dir(pc->rq)
	50	? "write" : "read");
	51	pc->flags \|= PC_FLAG_DMA_ERROR;
	52	} else {
	53	pc->xferred = pc->req_xfer;
	54	if (update_buffers)
	55	update_buffers(drive, pc);
	56	}
	57	debug_log("%s: DMA finished\n", drive->name);
	58	}
	59
	60	/* No more interrupts */
	61	if ((stat & DRQ_STAT) == 0) {
	62	debug_log("Packet command completed, %d bytes transferred\n",
	63	pc->xferred);
	64
	65	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
	66
	67	local_irq_enable_in_hardirq();
	68
	69	if (drive->media == ide_tape && !scsi &&
	70	(stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE)
	71	stat &= ~ERR_STAT;
	72	if ((stat & ERR_STAT) \|\| (pc->flags & PC_FLAG_DMA_ERROR)) {
	73	/* Error detected */
	74	debug_log("%s: I/O error\n", drive->name);
	75
	76	if (drive->media != ide_tape \|\| scsi) {
	77	pc->rq->errors++;
	78	if (scsi)
	79	goto cmd_finished;
	80	}
	81
	82	if (pc->c[0] == REQUEST_SENSE) {
	83	printk(KERN_ERR "%s: I/O error in request sense"
	84	" command\n", drive->name);
	85	return ide_do_reset(drive);
	86	}
	87
	88	debug_log("[cmd %x]: check condition\n", pc->c[0]);
	89
	90	/* Retry operation */
	91	retry_pc(drive);
	92	/* queued, but not started */
	93	return ide_stopped;
	94	}
	95	cmd_finished:
	96	pc->error = 0;
	97	if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
	98	(stat & SEEK_STAT) == 0) {
	99	dsc_handle(drive);
	100	return ide_stopped;
	101	}
	102	/* Command finished - Call the callback function */
776bb027	103	if (drive->media == ide_floppy \|\| drive->media == ide_tape)
2207fa5a BP	104	drive->pc_callback(drive);
	105	else
	106	pc->callback(drive);
646c0cb6 BZ	107	return ide_stopped;
	108	}
	109
	110	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
	111	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
	112	printk(KERN_ERR "%s: The device wants to issue more interrupts "
	113	"in DMA mode\n", drive->name);
	114	ide_dma_off(drive);
	115	return ide_do_reset(drive);
	116	}
646c0cb6	117
1823649b BZ	118	/* Get the number of bytes to transfer on this interrupt. */
1823649b BZ	119	ide_read_bcount_and_ireason(drive, &bcount, &ireason);
646c0cb6 BZ	120
	121	if (ireason & CD) {
	122	printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
	123	return ide_do_reset(drive);
	124	}
	125	if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
	126	/* Hopefully, we will never get here */
	127	printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
	128	"to %s!\n", drive->name,
	129	(ireason & IO) ? "Write" : "Read",
	130	(ireason & IO) ? "Read" : "Write");
	131	return ide_do_reset(drive);
	132	}
	133	if (!(pc->flags & PC_FLAG_WRITING)) {
	134	/* Reading - Check that we have enough space */
	135	temp = pc->xferred + bcount;
	136	if (temp > pc->req_xfer) {
	137	if (temp > pc->buf_size) {
	138	printk(KERN_ERR "%s: The device wants to send "
	139	"us more data than expected - "
	140	"discarding data\n",
	141	drive->name);
	142	if (scsi)
	143	temp = pc->buf_size - pc->xferred;
	144	else
	145	temp = 0;
	146	if (temp) {
	147	if (pc->sg)
	148	io_buffers(drive, pc, temp, 0);
	149	else
374e042c	150	tp_ops->input_data(drive, NULL,
646c0cb6 BZ	151	pc->cur_pos, temp);
	152	printk(KERN_ERR "%s: transferred %d of "
	153	"%d bytes\n",
	154	drive->name,
	155	temp, bcount);
	156	}
	157	pc->xferred += temp;
	158	pc->cur_pos += temp;
	159	ide_pad_transfer(drive, 0, bcount - temp);
	160	ide_set_handler(drive, handler, timeout,
	161	expiry);
	162	return ide_started;
	163	}
	164	debug_log("The device wants to send us more data than "
	165	"expected - allowing transfer\n");
	166	}
374e042c	167	xferfunc = tp_ops->input_data;
646c0cb6	168	} else
374e042c	169	xferfunc = tp_ops->output_data;
646c0cb6 BZ	170
	171	if ((drive->media == ide_floppy && !scsi && !pc->buf) \|\|
	172	(drive->media == ide_tape && !scsi && pc->bh) \|\|
	173	(scsi && pc->sg))
	174	io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING));
	175	else
	176	xferfunc(drive, NULL, pc->cur_pos, bcount);
	177
	178	/* Update the current position */
	179	pc->xferred += bcount;
	180	pc->cur_pos += bcount;
	181
	182	debug_log("[cmd %x] transferred %d bytes on that intr.\n",
	183	pc->c[0], bcount);
	184
	185	/* And set the interrupt handler again */
	186	ide_set_handler(drive, handler, timeout, expiry);
	187	return ide_started;
	188	}
	189	EXPORT_SYMBOL_GPL(ide_pc_intr);
594c16d8	190
88a72109 BZ	191	static u8 ide_read_ireason(ide_drive_t *drive)
	192	{
	193	ide_task_t task;
	194
	195	memset(&task, 0, sizeof(task));
	196	task.tf_flags = IDE_TFLAG_IN_NSECT;
	197
374e042c	198	drive->hwif->tp_ops->tf_read(drive, &task);
88a72109 BZ	199
	200	return task.tf.nsect & 3;
	201	}
	202
594c16d8 BZ	203	static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
594c16d8 BZ	204	{
594c16d8 BZ	205	int retries = 100;
	206
	207	while (retries-- && ((ireason & CD) == 0 \|\| (ireason & IO))) {
	208	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	209	"a packet command, retrying\n", drive->name);
	210	udelay(100);
88a72109	211	ireason = ide_read_ireason(drive);
594c16d8 BZ	212	if (retries == 0) {
	213	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	214	"a packet command, ignoring\n",
	215	drive->name);
	216	ireason \|= CD;
	217	ireason &= ~IO;
	218	}
	219	}
	220
	221	return ireason;
	222	}
	223
	224	ide_startstop_t ide_transfer_pc(ide_drive_t drive, struct ide_atapi_pc pc,
	225	ide_handler_t *handler, unsigned int timeout,
	226	ide_expiry_t *expiry)
	227	{
	228	ide_hwif_t *hwif = drive->hwif;
	229	ide_startstop_t startstop;
	230	u8 ireason;
	231
	232	if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
	233	printk(KERN_ERR "%s: Strange, packet command initiated yet "
	234	"DRQ isn't asserted\n", drive->name);
	235	return startstop;
	236	}
	237
88a72109	238	ireason = ide_read_ireason(drive);
594c16d8 BZ	239	if (drive->media == ide_tape && !drive->scsi)
	240	ireason = ide_wait_ireason(drive, ireason);
	241
	242	if ((ireason & CD) == 0 \|\| (ireason & IO)) {
	243	printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
	244	"a packet command\n", drive->name);
	245	return ide_do_reset(drive);
	246	}
	247
	248	/* Set the interrupt routine */
	249	ide_set_handler(drive, handler, timeout, expiry);
	250
	251	/* Begin DMA, if necessary */
	252	if (pc->flags & PC_FLAG_DMA_OK) {
	253	pc->flags \|= PC_FLAG_DMA_IN_PROGRESS;
	254	hwif->dma_ops->dma_start(drive);
	255	}
	256
	257	/* Send the actual packet */
	258	if ((pc->flags & PC_FLAG_ZIP_DRIVE) == 0)
374e042c	259	hwif->tp_ops->output_data(drive, NULL, pc->c, 12);
594c16d8 BZ	260
	261	return ide_started;
	262	}
	263	EXPORT_SYMBOL_GPL(ide_transfer_pc);
6bf1641c BZ	264
	265	ide_startstop_t ide_issue_pc(ide_drive_t drive, struct ide_atapi_pc pc,
	266	ide_handler_t *handler, unsigned int timeout,
	267	ide_expiry_t *expiry)
	268	{
	269	ide_hwif_t *hwif = drive->hwif;
	270	u16 bcount;
	271	u8 dma = 0;
	272
	273	/* We haven't transferred any data yet */
	274	pc->xferred = 0;
	275	pc->cur_pos = pc->buf;
	276
	277	/* Request to transfer the entire buffer at once */
	278	if (drive->media == ide_tape && !drive->scsi)
	279	bcount = pc->req_xfer;
	280	else
	281	bcount = min(pc->req_xfer, 63 * 1024);
	282
	283	if (pc->flags & PC_FLAG_DMA_ERROR) {
	284	pc->flags &= ~PC_FLAG_DMA_ERROR;
	285	ide_dma_off(drive);
	286	}
	287
	288	if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) {
	289	if (drive->scsi)
	290	hwif->sg_mapped = 1;
	291	dma = !hwif->dma_ops->dma_setup(drive);
	292	if (drive->scsi)
	293	hwif->sg_mapped = 0;
	294	}
	295
	296	if (!dma)
	297	pc->flags &= ~PC_FLAG_DMA_OK;
	298
	299	ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE,
	300	bcount, dma);
	301
	302	/* Issue the packet command */
	303	if (pc->flags & PC_FLAG_DRQ_INTERRUPT) {
	304	ide_execute_command(drive, WIN_PACKETCMD, handler,
	305	timeout, NULL);
	306	return ide_started;
	307	} else {
	308	ide_execute_pkt_cmd(drive);
	309	return (*handler)(drive);
	310	}
	311	}
	312	EXPORT_SYMBOL_GPL(ide_issue_pc);