cmd_ide.c

	/* Select device
	 */
	ide_outb(device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));

	while (blkcnt-- > 0) {

		c = ide_wait(device, IDE_TIME_OUT);

		if (c & ATA_STAT_BUSY) {
			printf("IDE read: device %d not ready\n", device);
			goto WR_OUT;
		}
#ifdef CONFIG_LBA48
		if (lba48) {
			/* write high bits */
			ide_outb(device, ATA_SECT_CNT, 0);
			ide_outb(device, ATA_LBA_LOW, (blknr >> 24) & 0xFF);
#ifdef CONFIG_SYS_64BIT_LBA
			ide_outb(device, ATA_LBA_MID, (blknr >> 32) & 0xFF);
			ide_outb(device, ATA_LBA_HIGH, (blknr >> 40) & 0xFF);
#else
			ide_outb(device, ATA_LBA_MID, 0);
			ide_outb(device, ATA_LBA_HIGH, 0);
#endif
		}
#endif
		ide_outb(device, ATA_SECT_CNT, 1);
		ide_outb(device, ATA_LBA_LOW, (blknr >> 0) & 0xFF);
		ide_outb(device, ATA_LBA_MID, (blknr >> 8) & 0xFF);
		ide_outb(device, ATA_LBA_HIGH, (blknr >> 16) & 0xFF);

#ifdef CONFIG_LBA48
		if (lba48) {
			ide_outb(device, ATA_DEV_HD,
				 ATA_LBA | ATA_DEVICE(device));
			ide_outb(device, ATA_COMMAND, ATA_CMD_WRITE_EXT);

		} else
#endif
		{
			ide_outb(device, ATA_DEV_HD, ATA_LBA |
				 ATA_DEVICE(device) | ((blknr >> 24) & 0xF));
			ide_outb(device, ATA_COMMAND, ATA_CMD_WRITE);
		}

		udelay(50);

		/* can't take over 500 ms */
		c = ide_wait(device, IDE_TIME_OUT);

		if ((c & (ATA_STAT_DRQ | ATA_STAT_BUSY | ATA_STAT_ERR)) !=
		    ATA_STAT_DRQ) {
#if defined(CONFIG_SYS_64BIT_LBA)
			printf("Error (no IRQ) dev %d blk %lld: status 0x%02x\n",
				device, blknr, c);
#else
			printf("Error (no IRQ) dev %d blk %ld: status 0x%02x\n",
				device, (ulong) blknr, c);
#endif
			goto WR_OUT;
		}

		ide_output_data(device, buffer, ATA_SECTORWORDS);
		c = ide_inb(device, ATA_STATUS);	/* clear IRQ */
		++n;
		++blknr;
		buffer += ATA_BLOCKSIZE;
	}
WR_OUT:
	ide_led(DEVICE_LED(device), 0);	/* LED off      */
	return (n);
}

/* ------------------------------------------------------------------------- */

/*
 * copy src to dest, skipping leading and trailing blanks and null
 * terminate the string
 * "len" is the size of available memory including the terminating '\0'
 */
static void ident_cpy(unsigned char *dst, unsigned char *src,
		      unsigned int len)
{
	unsigned char *end, *last;

	last = dst;
	end = src + len - 1;

	/* reserve space for '\0' */
	if (len < 2)
		goto OUT;

	/* skip leading white space */
	while ((*src) && (src < end) && (*src == ' '))
		++src;

	/* copy string, omitting trailing white space */
	while ((*src) && (src < end)) {
		*dst++ = *src;
		if (*src++ != ' ')
			last = dst;
	}
OUT:
	*last = '\0';
}

/* ------------------------------------------------------------------------- */

/*
 * Wait until Busy bit is off, or timeout (in ms)
 * Return last status
 */
static uchar ide_wait(int dev, ulong t)
{
	ulong delay = 10 * t;	/* poll every 100 us */
	uchar c;

	while ((c = ide_inb(dev, ATA_STATUS)) & ATA_STAT_BUSY) {
		udelay(100);
		if (delay-- == 0)
			break;
	}
	return (c);
}

/* ------------------------------------------------------------------------- */

#ifdef CONFIG_IDE_RESET
extern void ide_set_reset(int idereset);

static void ide_reset(void)
{
	int i;

	curr_device = -1;
	for (i = 0; i < CONFIG_SYS_IDE_MAXBUS; ++i)
		ide_bus_ok[i] = 0;
	for (i = 0; i < CONFIG_SYS_IDE_MAXDEVICE; ++i)
		ide_dev_desc[i].type = DEV_TYPE_UNKNOWN;

	ide_set_reset(1);	/* assert reset */

	/* the reset signal shall be asserted for et least 25 us */
	udelay(25);

	WATCHDOG_RESET();

	/* de-assert RESET signal */
	ide_set_reset(0);

	/* wait 250 ms */
	for (i = 0; i < 250; ++i)
		udelay(1000);
}

#endif /* CONFIG_IDE_RESET */

/* ------------------------------------------------------------------------- */

#if defined(CONFIG_OF_IDE_FIXUP)
int ide_device_present(int dev)
{
	if (dev >= CONFIG_SYS_IDE_MAXBUS)
		return 0;
	return (ide_dev_desc[dev].type == DEV_TYPE_UNKNOWN ? 0 : 1);
}
#endif
/* ------------------------------------------------------------------------- */

#ifdef CONFIG_ATAPI
/****************************************************************************
 * ATAPI Support
 */

void ide_input_data_shorts(int dev, ushort *sect_buf, int shorts)
	__attribute__ ((weak, alias("__ide_input_data_shorts")));

void ide_output_data_shorts(int dev, ushort *sect_buf, int shorts)
	__attribute__ ((weak, alias("__ide_output_data_shorts")));


#if defined(CONFIG_IDE_SWAP_IO)
/* since ATAPI may use commands with not 4 bytes alligned length
 * we have our own transfer functions, 2 bytes alligned */
void __ide_output_data_shorts(int dev, ushort *sect_buf, int shorts)
{
	ushort *dbuf;
	volatile ushort *pbuf;

	pbuf = (ushort *) (ATA_CURR_BASE(dev) + ATA_DATA_REG);
	dbuf = (ushort *) sect_buf;

	debug("in output data shorts base for read is %lx\n",
	      (unsigned long) pbuf);

	while (shorts--) {
		EIEIO;
		*pbuf = *dbuf++;
	}
}

void __ide_input_data_shorts(int dev, ushort *sect_buf, int shorts)
{
	ushort *dbuf;
	volatile ushort *pbuf;

	pbuf = (ushort *) (ATA_CURR_BASE(dev) + ATA_DATA_REG);
	dbuf = (ushort *) sect_buf;

	debug("in input data shorts base for read is %lx\n",
	      (unsigned long) pbuf);

	while (shorts--) {
		EIEIO;
		*dbuf++ = *pbuf;
	}
}

#else  /* ! CONFIG_IDE_SWAP_IO */
void __ide_output_data_shorts(int dev, ushort *sect_buf, int shorts)
{
	outsw(ATA_CURR_BASE(dev) + ATA_DATA_REG, sect_buf, shorts);
}

void __ide_input_data_shorts(int dev, ushort *sect_buf, int shorts)
{
	insw(ATA_CURR_BASE(dev) + ATA_DATA_REG, sect_buf, shorts);
}

#endif /* CONFIG_IDE_SWAP_IO */

/*
 * Wait until (Status & mask) == res, or timeout (in ms)
 * Return last status
 * This is used since some ATAPI CD ROMs clears their Busy Bit first
 * and then they set their DRQ Bit
 */
static uchar atapi_wait_mask(int dev, ulong t, uchar mask, uchar res)
{
	ulong delay = 10 * t;	/* poll every 100 us */
	uchar c;

	/* prevents to read the status before valid */
	c = ide_inb(dev, ATA_DEV_CTL);

	while (((c = ide_inb(dev, ATA_STATUS)) & mask) != res) {
		/* break if error occurs (doesn't make sense to wait more) */
		if ((c & ATA_STAT_ERR) == ATA_STAT_ERR)
			break;
		udelay(100);
		if (delay-- == 0)
			break;
	}
	return (c);
}

/*
 * issue an atapi command
 */
unsigned char atapi_issue(int device, unsigned char *ccb, int ccblen,
			  unsigned char *buffer, int buflen)
{
	unsigned char c, err, mask, res;
	int n;

	ide_led(DEVICE_LED(device), 1);	/* LED on       */

	/* Select device
	 */
	mask = ATA_STAT_BUSY | ATA_STAT_DRQ;
	res = 0;
	ide_outb(device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));
	c = atapi_wait_mask(device, ATAPI_TIME_OUT, mask, res);
	if ((c & mask) != res) {
		printf("ATAPI_ISSUE: device %d not ready status %X\n", device,
		       c);
		err = 0xFF;
		goto AI_OUT;
	}
	/* write taskfile */
	ide_outb(device, ATA_ERROR_REG, 0);	/* no DMA, no overlaped */
	ide_outb(device, ATA_SECT_CNT, 0);
	ide_outb(device, ATA_SECT_NUM, 0);
	ide_outb(device, ATA_CYL_LOW, (unsigned char) (buflen & 0xFF));
	ide_outb(device, ATA_CYL_HIGH,
		 (unsigned char) ((buflen >> 8) & 0xFF));
	ide_outb(device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));

	ide_outb(device, ATA_COMMAND, ATAPI_CMD_PACKET);
	udelay(50);

	mask = ATA_STAT_DRQ | ATA_STAT_BUSY | ATA_STAT_ERR;
	res = ATA_STAT_DRQ;
	c = atapi_wait_mask(device, ATAPI_TIME_OUT, mask, res);

	if ((c & mask) != res) {	/* DRQ must be 1, BSY 0 */
		printf("ATAPI_ISSUE: Error (no IRQ) before sending ccb dev %d status 0x%02x\n",
			device, c);
		err = 0xFF;
		goto AI_OUT;
	}

	/* write command block */
	ide_output_data_shorts(device, (unsigned short *) ccb, ccblen / 2);

	/* ATAPI Command written wait for completition */
	udelay(5000);		/* device must set bsy */

	mask = ATA_STAT_DRQ | ATA_STAT_BUSY | ATA_STAT_ERR;
	/*
	 * if no data wait for DRQ = 0 BSY = 0
	 * if data wait for DRQ = 1 BSY = 0
	 */
	res = 0;
	if (buflen)
		res = ATA_STAT_DRQ;
	c = atapi_wait_mask(device, ATAPI_TIME_OUT, mask, res);
	if ((c & mask) != res) {
		if (c & ATA_STAT_ERR) {
			err = (ide_inb(device, ATA_ERROR_REG)) >> 4;
			debug("atapi_issue 1 returned sense key %X status %02X\n",
				err, c);
		} else {
			printf("ATAPI_ISSUE: (no DRQ) after sending ccb (%x)  status 0x%02x\n",
				ccb[0], c);
			err = 0xFF;
		}
		goto AI_OUT;
	}
	n = ide_inb(device, ATA_CYL_HIGH);
	n <<= 8;
	n += ide_inb(device, ATA_CYL_LOW);
	if (n > buflen) {
		printf("ERROR, transfer bytes %d requested only %d\n", n,
		       buflen);
		err = 0xff;
		goto AI_OUT;
	}
	if ((n == 0) && (buflen < 0)) {
		printf("ERROR, transfer bytes %d requested %d\n", n, buflen);
		err = 0xff;
		goto AI_OUT;
	}
	if (n != buflen) {
		debug("WARNING, transfer bytes %d not equal with requested %d\n",
			n, buflen);
	}
	if (n != 0) {		/* data transfer */
		debug("ATAPI_ISSUE: %d Bytes to transfer\n", n);
		/* we transfer shorts */
		n >>= 1;
		/* ok now decide if it is an in or output */
		if ((ide_inb(device, ATA_SECT_CNT) & 0x02) == 0) {
			debug("Write to device\n");
			ide_output_data_shorts(device,
				(unsigned short *) buffer, n);
		} else {
			debug("Read from device @ %p shorts %d\n", buffer, n);
			ide_input_data_shorts(device,
				(unsigned short *) buffer, n);
		}
	}
	udelay(5000);		/* seems that some CD ROMs need this... */
	mask = ATA_STAT_BUSY | ATA_STAT_ERR;
	res = 0;
	c = atapi_wait_mask(device, ATAPI_TIME_OUT, mask, res);
	if ((c & ATA_STAT_ERR) == ATA_STAT_ERR) {
		err = (ide_inb(device, ATA_ERROR_REG) >> 4);
		debug("atapi_issue 2 returned sense key %X status %X\n", err,
		      c);
	} else {
		err = 0;
	}
AI_OUT:
	ide_led(DEVICE_LED(device), 0);	/* LED off      */
	return (err);
}

/*
 * sending the command to atapi_issue. If an status other than good
 * returns, an request_sense will be issued
 */

#define ATAPI_DRIVE_NOT_READY	100
#define ATAPI_UNIT_ATTN		10

unsigned char atapi_issue_autoreq(int device,
				  unsigned char *ccb,
				  int ccblen,
				  unsigned char *buffer, int buflen)
{
	unsigned char sense_data[18], sense_ccb[12];
	unsigned char res, key, asc, ascq;
	int notready, unitattn;

	unitattn = ATAPI_UNIT_ATTN;
	notready = ATAPI_DRIVE_NOT_READY;

retry:
	res = atapi_issue(device, ccb, ccblen, buffer, buflen);
	if (res == 0)
		return 0;	/* Ok */

	if (res == 0xFF)
		return 0xFF;	/* error */

	debug("(auto_req)atapi_issue returned sense key %X\n", res);

	memset(sense_ccb, 0, sizeof(sense_ccb));
	memset(sense_data, 0, sizeof(sense_data));
	sense_ccb[0] = ATAPI_CMD_REQ_SENSE;
	sense_ccb[4] = 18;	/* allocation Length */

	res = atapi_issue(device, sense_ccb, 12, sense_data, 18);
	key = (sense_data[2] & 0xF);
	asc = (sense_data[12]);
	ascq = (sense_data[13]);

	debug("ATAPI_CMD_REQ_SENSE returned %x\n", res);
	debug(" Sense page: %02X key %02X ASC %02X ASCQ %02X\n",
	      sense_data[0], key, asc, ascq);

	if ((key == 0))
		return 0;	/* ok device ready */

	if ((key == 6) || (asc == 0x29) || (asc == 0x28)) { /* Unit Attention */
		if (unitattn-- > 0) {
			udelay(200 * 1000);
			goto retry;
		}
		printf("Unit Attention, tried %d\n", ATAPI_UNIT_ATTN);
		goto error;
	}
	if ((asc == 0x4) && (ascq == 0x1)) {
		/* not ready, but will be ready soon */
		if (notready-- > 0) {
			udelay(200 * 1000);
			goto retry;
		}
		printf("Drive not ready, tried %d times\n",
		       ATAPI_DRIVE_NOT_READY);
		goto error;
	}
	if (asc == 0x3a) {
		debug("Media not present\n");
		goto error;
	}

	printf("ERROR: Unknown Sense key %02X ASC %02X ASCQ %02X\n", key, asc,
	       ascq);
error:
	debug("ERROR Sense key %02X ASC %02X ASCQ %02X\n", key, asc, ascq);
	return (0xFF);
}


static void atapi_inquiry(block_dev_desc_t *dev_desc)
{
	unsigned char ccb[12];	/* Command descriptor block */
	unsigned char iobuf[64];	/* temp buf */
	unsigned char c;
	int device;

	device = dev_desc->dev;
	dev_desc->type = DEV_TYPE_UNKNOWN;	/* not yet valid */
	dev_desc->block_read = atapi_read;

	memset(ccb, 0, sizeof(ccb));
	memset(iobuf, 0, sizeof(iobuf));

	ccb[0] = ATAPI_CMD_INQUIRY;
	ccb[4] = 40;		/* allocation Legnth */
	c = atapi_issue_autoreq(device, ccb, 12, (unsigned char *) iobuf, 40);

	debug("ATAPI_CMD_INQUIRY returned %x\n", c);
	if (c != 0)
		return;

	/* copy device ident strings */
	ident_cpy((unsigned char *) dev_desc->vendor, &iobuf[8], 8);
	ident_cpy((unsigned char *) dev_desc->product, &iobuf[16], 16);
	ident_cpy((unsigned char *) dev_desc->revision, &iobuf[32], 5);

	dev_desc->lun = 0;
	dev_desc->lba = 0;
	dev_desc->blksz = 0;
	dev_desc->type = iobuf[0] & 0x1f;

	if ((iobuf[1] & 0x80) == 0x80)
		dev_desc->removable = 1;
	else
		dev_desc->removable = 0;

	memset(ccb, 0, sizeof(ccb));
	memset(iobuf, 0, sizeof(iobuf));
	ccb[0] = ATAPI_CMD_START_STOP;
	ccb[4] = 0x03;		/* start */

	c = atapi_issue_autoreq(device, ccb, 12, (unsigned char *) iobuf, 0);

	debug("ATAPI_CMD_START_STOP returned %x\n", c);
	if (c != 0)
		return;

	memset(ccb, 0, sizeof(ccb));
	memset(iobuf, 0, sizeof(iobuf));
	c = atapi_issue_autoreq(device, ccb, 12, (unsigned char *) iobuf, 0);

	debug("ATAPI_CMD_UNIT_TEST_READY returned %x\n", c);
	if (c != 0)
		return;

	memset(ccb, 0, sizeof(ccb));
	memset(iobuf, 0, sizeof(iobuf));
	ccb[0] = ATAPI_CMD_READ_CAP;
	c = atapi_issue_autoreq(device, ccb, 12, (unsigned char *) iobuf, 8);
	debug("ATAPI_CMD_READ_CAP returned %x\n", c);
	if (c != 0)
		return;

	debug("Read Cap: LBA %02X%02X%02X%02X blksize %02X%02X%02X%02X\n",
	      iobuf[0], iobuf[1], iobuf[2], iobuf[3],
	      iobuf[4], iobuf[5], iobuf[6], iobuf[7]);

	dev_desc->lba = ((unsigned long) iobuf[0] << 24) +
		((unsigned long) iobuf[1] << 16) +
		((unsigned long) iobuf[2] << 8) + ((unsigned long) iobuf[3]);
	dev_desc->blksz = ((unsigned long) iobuf[4] << 24) +
		((unsigned long) iobuf[5] << 16) +
		((unsigned long) iobuf[6] << 8) + ((unsigned long) iobuf[7]);
#ifdef CONFIG_LBA48
	/* ATAPI devices cannot use 48bit addressing (ATA/ATAPI v7) */
	dev_desc->lba48 = 0;
#endif
	return;
}


/*
 * atapi_read:
 * we transfer only one block per command, since the multiple DRQ per
 * command is not yet implemented
 */
#define ATAPI_READ_MAX_BYTES	2048	/* we read max 2kbytes */
#define ATAPI_READ_BLOCK_SIZE	2048	/* assuming CD part */
#define ATAPI_READ_MAX_BLOCK	(ATAPI_READ_MAX_BYTES/ATAPI_READ_BLOCK_SIZE)

ulong atapi_read(int device, lbaint_t blknr, ulong blkcnt, void *buffer)
{
	ulong n = 0;
	unsigned char ccb[12];	/* Command descriptor block */
	ulong cnt;

	debug("atapi_read dev %d start %lX, blocks %lX buffer at %lX\n",
	      device, blknr, blkcnt, (ulong) buffer);

	do {
		if (blkcnt > ATAPI_READ_MAX_BLOCK)
			cnt = ATAPI_READ_MAX_BLOCK;
		else
			cnt = blkcnt;

		ccb[0] = ATAPI_CMD_READ_12;
		ccb[1] = 0;	/* reserved */
		ccb[2] = (unsigned char) (blknr >> 24) & 0xFF;	/* MSB Block */
		ccb[3] = (unsigned char) (blknr >> 16) & 0xFF;	/*  */
		ccb[4] = (unsigned char) (blknr >> 8) & 0xFF;
		ccb[5] = (unsigned char) blknr & 0xFF;	/* LSB Block */
		ccb[6] = (unsigned char) (cnt >> 24) & 0xFF; /* MSB Block cnt */
		ccb[7] = (unsigned char) (cnt >> 16) & 0xFF;
		ccb[8] = (unsigned char) (cnt >> 8) & 0xFF;
		ccb[9] = (unsigned char) cnt & 0xFF;	/* LSB Block */
		ccb[10] = 0;	/* reserved */
		ccb[11] = 0;	/* reserved */

		if (atapi_issue_autoreq(device, ccb, 12,
					(unsigned char *) buffer,
					cnt * ATAPI_READ_BLOCK_SIZE)
		    == 0xFF) {
			return (n);
		}
		n += cnt;
		blkcnt -= cnt;
		blknr += cnt;
		buffer += (cnt * ATAPI_READ_BLOCK_SIZE);
	} while (blkcnt > 0);
	return (n);
}

/* ------------------------------------------------------------------------- */

#endif /* CONFIG_ATAPI */

U_BOOT_CMD(ide, 5, 1, do_ide,
	   "IDE sub-system",
	   "reset - reset IDE controller\n"
	   "ide info  - show available IDE devices\n"
	   "ide device [dev] - show or set current device\n"
	   "ide part [dev] - print partition table of one or all IDE devices\n"
	   "ide read  addr blk# cnt\n"
	   "ide write addr blk# cnt - read/write `cnt'"
	   " blocks starting at block `blk#'\n"
	   "    to/from memory address `addr'");

U_BOOT_CMD(diskboot, 3, 1, do_diskboot,
	   "boot from IDE device", "loadAddr dev:part");