[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;
	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. */
	bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
		  hwif->INB(hwif->io_ports.lbam_addr);

	ireason = hwif->INB(hwif->io_ports.nsect_addr);

	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	}
110	/* Get the number of bytes to transfer on this interrupt. */
111	bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) \|
112	hwif->INB(hwif->io_ports.lbam_addr);
113
114	ireason = hwif->INB(hwif->io_ports.nsect_addr);
115
116	if (ireason & CD) {
117	printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
118	return ide_do_reset(drive);
119	}
120	if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
121	/* Hopefully, we will never get here */
122	printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
123	"to %s!\n", drive->name,
124	(ireason & IO) ? "Write" : "Read",
125	(ireason & IO) ? "Read" : "Write");
126	return ide_do_reset(drive);
127	}
128	if (!(pc->flags & PC_FLAG_WRITING)) {
129	/* Reading - Check that we have enough space */
130	temp = pc->xferred + bcount;
131	if (temp > pc->req_xfer) {
132	if (temp > pc->buf_size) {
133	printk(KERN_ERR "%s: The device wants to send "
134	"us more data than expected - "
135	"discarding data\n",
136	drive->name);
137	if (scsi)
138	temp = pc->buf_size - pc->xferred;
139	else
140	temp = 0;
141	if (temp) {
142	if (pc->sg)
143	io_buffers(drive, pc, temp, 0);
144	else
145	hwif->input_data(drive, NULL,
146	pc->cur_pos, temp);
147	printk(KERN_ERR "%s: transferred %d of "
148	"%d bytes\n",
149	drive->name,
150	temp, bcount);
151	}
152	pc->xferred += temp;
153	pc->cur_pos += temp;
154	ide_pad_transfer(drive, 0, bcount - temp);
155	ide_set_handler(drive, handler, timeout,
156	expiry);
157	return ide_started;
158	}
159	debug_log("The device wants to send us more data than "
160	"expected - allowing transfer\n");
161	}
162	xferfunc = hwif->input_data;
163	} else
164	xferfunc = hwif->output_data;
165
166	if ((drive->media == ide_floppy && !scsi && !pc->buf) \|\|
167	(drive->media == ide_tape && !scsi && pc->bh) \|\|
168	(scsi && pc->sg))
169	io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING));
170	else
171	xferfunc(drive, NULL, pc->cur_pos, bcount);
172
173	/* Update the current position */
174	pc->xferred += bcount;
175	pc->cur_pos += bcount;
176
177	debug_log("[cmd %x] transferred %d bytes on that intr.\n",
178	pc->c[0], bcount);
179
180	/* And set the interrupt handler again */
181	ide_set_handler(drive, handler, timeout, expiry);
182	return ide_started;
183	}
184	EXPORT_SYMBOL_GPL(ide_pc_intr);
594c16d8	185
88a72109 BZ	186	static u8 ide_read_ireason(ide_drive_t *drive)
	187	{
	188	ide_task_t task;
	189
	190	memset(&task, 0, sizeof(task));
	191	task.tf_flags = IDE_TFLAG_IN_NSECT;
	192
	193	drive->hwif->tf_read(drive, &task);
	194
	195	return task.tf.nsect & 3;
	196	}
	197
594c16d8 BZ	198	static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
594c16d8 BZ	199	{
594c16d8 BZ	200	int retries = 100;
	201
	202	while (retries-- && ((ireason & CD) == 0 \|\| (ireason & IO))) {
	203	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	204	"a packet command, retrying\n", drive->name);
	205	udelay(100);
88a72109	206	ireason = ide_read_ireason(drive);
594c16d8 BZ	207	if (retries == 0) {
	208	printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
	209	"a packet command, ignoring\n",
	210	drive->name);
	211	ireason \|= CD;
	212	ireason &= ~IO;
	213	}
	214	}
	215
	216	return ireason;
	217	}
	218
	219	ide_startstop_t ide_transfer_pc(ide_drive_t drive, struct ide_atapi_pc pc,
	220	ide_handler_t *handler, unsigned int timeout,
	221	ide_expiry_t *expiry)
	222	{
	223	ide_hwif_t *hwif = drive->hwif;
	224	ide_startstop_t startstop;
	225	u8 ireason;
	226
	227	if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
	228	printk(KERN_ERR "%s: Strange, packet command initiated yet "
	229	"DRQ isn't asserted\n", drive->name);
	230	return startstop;
	231	}
	232
88a72109	233	ireason = ide_read_ireason(drive);
594c16d8 BZ	234	if (drive->media == ide_tape && !drive->scsi)
	235	ireason = ide_wait_ireason(drive, ireason);
	236
	237	if ((ireason & CD) == 0 \|\| (ireason & IO)) {
	238	printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
	239	"a packet command\n", drive->name);
	240	return ide_do_reset(drive);
	241	}
	242
	243	/* Set the interrupt routine */
	244	ide_set_handler(drive, handler, timeout, expiry);
	245
	246	/* Begin DMA, if necessary */
	247	if (pc->flags & PC_FLAG_DMA_OK) {
	248	pc->flags \|= PC_FLAG_DMA_IN_PROGRESS;
	249	hwif->dma_ops->dma_start(drive);
	250	}
	251
	252	/* Send the actual packet */
	253	if ((pc->flags & PC_FLAG_ZIP_DRIVE) == 0)
	254	hwif->output_data(drive, NULL, pc->c, 12);
	255
	256	return ide_started;
	257	}
	258	EXPORT_SYMBOL_GPL(ide_transfer_pc);
6bf1641c BZ	259
	260	ide_startstop_t ide_issue_pc(ide_drive_t drive, struct ide_atapi_pc pc,
	261	ide_handler_t *handler, unsigned int timeout,
	262	ide_expiry_t *expiry)
	263	{
	264	ide_hwif_t *hwif = drive->hwif;
	265	u16 bcount;
	266	u8 dma = 0;
	267
	268	/* We haven't transferred any data yet */
	269	pc->xferred = 0;
	270	pc->cur_pos = pc->buf;
	271
	272	/* Request to transfer the entire buffer at once */
	273	if (drive->media == ide_tape && !drive->scsi)
	274	bcount = pc->req_xfer;
	275	else
	276	bcount = min(pc->req_xfer, 63 * 1024);
	277
	278	if (pc->flags & PC_FLAG_DMA_ERROR) {
	279	pc->flags &= ~PC_FLAG_DMA_ERROR;
	280	ide_dma_off(drive);
	281	}
	282
	283	if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) {
	284	if (drive->scsi)
	285	hwif->sg_mapped = 1;
	286	dma = !hwif->dma_ops->dma_setup(drive);
	287	if (drive->scsi)
	288	hwif->sg_mapped = 0;
	289	}
	290
	291	if (!dma)
	292	pc->flags &= ~PC_FLAG_DMA_OK;
	293
	294	ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE,
	295	bcount, dma);
	296
	297	/* Issue the packet command */
	298	if (pc->flags & PC_FLAG_DRQ_INTERRUPT) {
	299	ide_execute_command(drive, WIN_PACKETCMD, handler,
	300	timeout, NULL);
	301	return ide_started;
	302	} else {
	303	ide_execute_pkt_cmd(drive);
	304	return (*handler)(drive);
	305	}
	306	}
	307	EXPORT_SYMBOL_GPL(ide_issue_pc);