[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;
	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) {
		pc->callback(drive);
		return ide_stopped;
	}

	/* Clear the interrupt */
	stat = hwif->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 */
		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
						hwif->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 = hwif->input_data;
	} else
		xferfunc = hwif->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->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->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;
	25	xfer_func_t *xferfunc;
	26	unsigned int temp;
	27	u16 bcount;
	28	u8 stat, ireason, scsi = drive->scsi;
	29
	30	debug_log("Enter %s - interrupt handler\n", __func__);
	31
	32	if (pc->flags & PC_FLAG_TIMEDOUT) {
	33	pc->callback(drive);
	34	return ide_stopped;
	35	}
	36
	37	/* Clear the interrupt */
b73c7ee2	38	stat = hwif->read_status(hwif);
646c0cb6 BZ	39
	40	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
	41	if (hwif->dma_ops->dma_end(drive) \|\|
	42	(drive->media == ide_tape && !scsi && (stat & ERR_STAT))) {
	43	if (drive->media == ide_floppy && !scsi)
	44	printk(KERN_ERR "%s: DMA %s error\n",
	45	drive->name, rq_data_dir(pc->rq)
	46	? "write" : "read");
	47	pc->flags \|= PC_FLAG_DMA_ERROR;
	48	} else {
	49	pc->xferred = pc->req_xfer;
	50	if (update_buffers)
	51	update_buffers(drive, pc);
	52	}
	53	debug_log("%s: DMA finished\n", drive->name);
	54	}
	55
	56	/* No more interrupts */
	57	if ((stat & DRQ_STAT) == 0) {
	58	debug_log("Packet command completed, %d bytes transferred\n",
	59	pc->xferred);
	60
	61	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
	62
	63	local_irq_enable_in_hardirq();
	64
	65	if (drive->media == ide_tape && !scsi &&
	66	(stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE)
	67	stat &= ~ERR_STAT;
	68	if ((stat & ERR_STAT) \|\| (pc->flags & PC_FLAG_DMA_ERROR)) {
	69	/* Error detected */
	70	debug_log("%s: I/O error\n", drive->name);
	71
	72	if (drive->media != ide_tape \|\| scsi) {
	73	pc->rq->errors++;
	74	if (scsi)
	75	goto cmd_finished;
	76	}
	77
	78	if (pc->c[0] == REQUEST_SENSE) {
	79	printk(KERN_ERR "%s: I/O error in request sense"
	80	" command\n", drive->name);
	81	return ide_do_reset(drive);
	82	}
	83
	84	debug_log("[cmd %x]: check condition\n", pc->c[0]);
	85
	86	/* Retry operation */
	87	retry_pc(drive);
	88	/* queued, but not started */
	89	return ide_stopped;
	90	}
	91	cmd_finished:
	92	pc->error = 0;
	93	if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
	94	(stat & SEEK_STAT) == 0) {
	95	dsc_handle(drive);
	96	return ide_stopped;
	97	}
	98	/* Command finished - Call the callback function */
	99	pc->callback(drive);
	100	return ide_stopped;
	101	}
	102
103	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
104	pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
105	printk(KERN_ERR "%s: The device wants to issue more interrupts "
106	"in DMA mode\n", drive->name);
107	ide_dma_off(drive);
108	return ide_do_reset(drive);
109	}
646c0cb6	110
1823649b BZ	111	/* Get the number of bytes to transfer on this interrupt. */
1823649b BZ	112	ide_read_bcount_and_ireason(drive, &bcount, &ireason);
646c0cb6 BZ	113
	114	if (ireason & CD) {
	115	printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
	116	return ide_do_reset(drive);
	117	}
	118	if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
	119	/* Hopefully, we will never get here */
	120	printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
	121	"to %s!\n", drive->name,
	122	(ireason & IO) ? "Write" : "Read",
	123	(ireason & IO) ? "Read" : "Write");
	124	return ide_do_reset(drive);
	125	}
	126	if (!(pc->flags & PC_FLAG_WRITING)) {
	127	/* Reading - Check that we have enough space */
	128	temp = pc->xferred + bcount;
	129	if (temp > pc->req_xfer) {
	130	if (temp > pc->buf_size) {
	131	printk(KERN_ERR "%s: The device wants to send "
	132	"us more data than expected - "
	133	"discarding data\n",
	134	drive->name);
	135	if (scsi)
	136	temp = pc->buf_size - pc->xferred;
	137	else
	138	temp = 0;
	139	if (temp) {
	140	if (pc->sg)
	141	io_buffers(drive, pc, temp, 0);
	142	else
	143	hwif->input_data(drive, NULL,
	144	pc->cur_pos, temp);
	145	printk(KERN_ERR "%s: transferred %d of "
	146	"%d bytes\n",
	147	drive->name,
	148	temp, bcount);
	149	}
	150	pc->xferred += temp;
	151	pc->cur_pos += temp;
	152	ide_pad_transfer(drive, 0, bcount - temp);
	153	ide_set_handler(drive, handler, timeout,
	154	expiry);
	155	return ide_started;
	156	}
	157	debug_log("The device wants to send us more data than "
	158	"expected - allowing transfer\n");
	159	}
	160	xferfunc = hwif->input_data;
	161	} else
	162	xferfunc = hwif->output_data;
	163
	164	if ((drive->media == ide_floppy && !scsi && !pc->buf) \|\|
	165	(drive->media == ide_tape && !scsi && pc->bh) \|\|
	166	(scsi && pc->sg))
	167	io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING));
	168	else
	169	xferfunc(drive, NULL, pc->cur_pos, bcount);
	170
	171	/* Update the current position */
	172	pc->xferred += bcount;
	173	pc->cur_pos += bcount;
	174
	175	debug_log("[cmd %x] transferred %d bytes on that intr.\n",
	176	pc->c[0], bcount);
177
178	/* And set the interrupt handler again */
179	ide_set_handler(drive, handler, timeout, expiry);
180	return ide_started;
181	}
182	EXPORT_SYMBOL_GPL(ide_pc_intr);
594c16d8	183
88a72109 BZ	184	static u8 ide_read_ireason(ide_drive_t *drive)
	185	{
	186	ide_task_t task;
	187
	188	memset(&task, 0, sizeof(task));
	189	task.tf_flags = IDE_TFLAG_IN_NSECT;
	190
	191	drive->hwif->tf_read(drive, &task);
	192
	193	return task.tf.nsect & 3;
	194	}
	195
594c16d8 BZ	196	static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
594c16d8 BZ	197	{
594c16d8 BZ	198	int retries = 100;
	199
	200	while (retries-- && ((ireason & CD) == 0 \|\| (ireason & IO))) {
	201	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	202	"a packet command, retrying\n", drive->name);
	203	udelay(100);
88a72109	204	ireason = ide_read_ireason(drive);
594c16d8 BZ	205	if (retries == 0) {
	206	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	207	"a packet command, ignoring\n",
	208	drive->name);
	209	ireason \|= CD;
	210	ireason &= ~IO;
	211	}
	212	}
	213
	214	return ireason;
	215	}
	216
	217	ide_startstop_t ide_transfer_pc(ide_drive_t drive, struct ide_atapi_pc pc,
	218	ide_handler_t *handler, unsigned int timeout,
	219	ide_expiry_t *expiry)
	220	{
	221	ide_hwif_t *hwif = drive->hwif;
	222	ide_startstop_t startstop;
	223	u8 ireason;
	224
	225	if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
	226	printk(KERN_ERR "%s: Strange, packet command initiated yet "
	227	"DRQ isn't asserted\n", drive->name);
	228	return startstop;
	229	}
	230
88a72109	231	ireason = ide_read_ireason(drive);
594c16d8 BZ	232	if (drive->media == ide_tape && !drive->scsi)
	233	ireason = ide_wait_ireason(drive, ireason);
	234
	235	if ((ireason & CD) == 0 \|\| (ireason & IO)) {
	236	printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
	237	"a packet command\n", drive->name);
	238	return ide_do_reset(drive);
	239	}
	240
	241	/* Set the interrupt routine */
	242	ide_set_handler(drive, handler, timeout, expiry);
	243
	244	/* Begin DMA, if necessary */
	245	if (pc->flags & PC_FLAG_DMA_OK) {
	246	pc->flags \|= PC_FLAG_DMA_IN_PROGRESS;
	247	hwif->dma_ops->dma_start(drive);
	248	}
	249
	250	/* Send the actual packet */
	251	if ((pc->flags & PC_FLAG_ZIP_DRIVE) == 0)
	252	hwif->output_data(drive, NULL, pc->c, 12);
	253
	254	return ide_started;
	255	}
	256	EXPORT_SYMBOL_GPL(ide_transfer_pc);
6bf1641c BZ	257
	258	ide_startstop_t ide_issue_pc(ide_drive_t drive, struct ide_atapi_pc pc,
	259	ide_handler_t *handler, unsigned int timeout,
	260	ide_expiry_t *expiry)
	261	{
	262	ide_hwif_t *hwif = drive->hwif;
	263	u16 bcount;
	264	u8 dma = 0;
	265
	266	/* We haven't transferred any data yet */
	267	pc->xferred = 0;
	268	pc->cur_pos = pc->buf;
	269
	270	/* Request to transfer the entire buffer at once */
	271	if (drive->media == ide_tape && !drive->scsi)
	272	bcount = pc->req_xfer;
	273	else
	274	bcount = min(pc->req_xfer, 63 * 1024);
	275
	276	if (pc->flags & PC_FLAG_DMA_ERROR) {
	277	pc->flags &= ~PC_FLAG_DMA_ERROR;
	278	ide_dma_off(drive);
	279	}
	280
	281	if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) {
	282	if (drive->scsi)
	283	hwif->sg_mapped = 1;
	284	dma = !hwif->dma_ops->dma_setup(drive);
	285	if (drive->scsi)
	286	hwif->sg_mapped = 0;
	287	}
	288
	289	if (!dma)
	290	pc->flags &= ~PC_FLAG_DMA_OK;
	291
	292	ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE,
	293	bcount, dma);
	294
	295	/* Issue the packet command */
	296	if (pc->flags & PC_FLAG_DRQ_INTERRUPT) {
	297	ide_execute_command(drive, WIN_PACKETCMD, handler,
	298	timeout, NULL);
	299	return ide_started;
	300	} else {
	301	ide_execute_pkt_cmd(drive);
	302	return (*handler)(drive);
	303	}
	304	}
	305	EXPORT_SYMBOL_GPL(ide_issue_pc);