cmd_ide.c

#ifdef CONFIG_AMIGAONEG3SE
	s = getenv("ide_doreset");
	if (s && strcmp(s, "on") == 0 && 1 == do_retry) {
		/* Need to soft reset the device in case it's an ATAPI...  */
		PRINTF("Retrying...\n");
		ide_outb (device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));
		udelay(100000);
		ide_outb (device, ATA_COMMAND, 0x08);
		udelay (100000);	/* 100 ms */
		retries++;
	} else {
		retries = 100;
	}
    }	/* see above - ugly to read */
#endif	/* CONFIG_AMIGAONEG3SE */

	input_swap_data (device, iobuf, ATA_SECTORWORDS);

	ident_cpy (dev_desc->revision, iop->fw_rev, sizeof(dev_desc->revision));
	ident_cpy (dev_desc->vendor, iop->model, sizeof(dev_desc->vendor));
	ident_cpy (dev_desc->product, iop->serial_no, sizeof(dev_desc->product));

	if ((iop->config & 0x0080)==0x0080)
		dev_desc->removable = 1;
	else
		dev_desc->removable = 0;

#if 0
	/*
	 * Drive PIO mode autoselection
	 */
	mode = iop->tPIO;

	printf ("tPIO = 0x%02x = %d\n",mode, mode);
	if (mode > 2) {		/* 2 is maximum allowed tPIO value */
		mode = 2;
		PRINTF ("Override tPIO -> 2\n");
	}
	if (iop->field_valid & 2) {	/* drive implements ATA2? */
		PRINTF ("Drive implements ATA2\n");
		if (iop->capability & 8) {	/* drive supports use_iordy? */
			cycle_time = iop->eide_pio_iordy;
		} else {
			cycle_time = iop->eide_pio;
		}
		PRINTF ("cycle time = %d\n", cycle_time);
		mode = 4;
		if (cycle_time > 120) mode = 3;	/* 120 ns for PIO mode 4 */
		if (cycle_time > 180) mode = 2;	/* 180 ns for PIO mode 3 */
		if (cycle_time > 240) mode = 1;	/* 240 ns for PIO mode 4 */
		if (cycle_time > 383) mode = 0;	/* 383 ns for PIO mode 4 */
	}
	printf ("PIO mode to use: PIO %d\n", mode);
#endif /* 0 */

#ifdef CONFIG_ATAPI
	if (dev_desc->if_type==IF_TYPE_ATAPI) {
		atapi_inquiry(dev_desc);
		return;
	}
#endif /* CONFIG_ATAPI */

	/* swap shorts */
	dev_desc->lba = (iop->lba_capacity << 16) | (iop->lba_capacity >> 16);
	/* assuming HD */
	dev_desc->type=DEV_TYPE_HARDDISK;
	dev_desc->blksz=ATA_BLOCKSIZE;
	dev_desc->lun=0; /* just to fill something in... */

#if 0 	/* only used to test the powersaving mode,
	 * if enabled, the drive goes after 5 sec
	 * in standby mode */
	ide_outb (device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));
	c = ide_wait (device, IDE_TIME_OUT);
	ide_outb (device, ATA_SECT_CNT, 1);
	ide_outb (device, ATA_LBA_LOW,  0);
	ide_outb (device, ATA_LBA_MID,  0);
	ide_outb (device, ATA_LBA_HIGH, 0);
	ide_outb (device, ATA_DEV_HD,   ATA_LBA		|
				    ATA_DEVICE(device));
	ide_outb (device, ATA_COMMAND,  0xe3);
	udelay (50);
	c = ide_wait (device, IDE_TIME_OUT);	/* can't take over 500 ms */
#endif
}


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

ulong ide_read (int device, ulong blknr, ulong blkcnt, ulong *buffer)
{
	ulong n = 0;
	unsigned char c;
	unsigned char pwrsave=0; /* power save */

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

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

	/* Select device
	 */
	ide_outb (device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));
	c = ide_wait (device, IDE_TIME_OUT);

	if (c & ATA_STAT_BUSY) {
		printf ("IDE read: device %d not ready\n", device);
		goto IDE_READ_E;
	}

	/* first check if the drive is in Powersaving mode, if yes,
	 * increase the timeout value */
	ide_outb (device, ATA_COMMAND,  ATA_CMD_CHK_PWR);
	udelay (50);

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

	if (c & ATA_STAT_BUSY) {
		printf ("IDE read: device %d not ready\n", device);
		goto IDE_READ_E;
	}
	if ((c & ATA_STAT_ERR) == ATA_STAT_ERR) {
		printf ("No Powersaving mode %X\n", c);
	} else {
		c = ide_inb(device,ATA_SECT_CNT);
		PRINTF("Powersaving %02X\n",c);
		if(c==0)
			pwrsave=1;
	}


	while (blkcnt-- > 0) {

		c = ide_wait (device, IDE_TIME_OUT);

		if (c & ATA_STAT_BUSY) {
			printf ("IDE read: device %d not ready\n", device);
			break;
		}

		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);
		ide_outb (device, ATA_DEV_HD,   ATA_LBA		|
					    ATA_DEVICE(device)	|
					    ((blknr >> 24) & 0xF) );
		ide_outb (device, ATA_COMMAND,  ATA_CMD_READ);

		udelay (50);

		if(pwrsave) {
			c = ide_wait (device, IDE_SPIN_UP_TIME_OUT);	/* may take up to 4 sec */
			pwrsave=0;
		} else {
			c = ide_wait (device, IDE_TIME_OUT);	/* can't take over 500 ms */
		}

		if ((c&(ATA_STAT_DRQ|ATA_STAT_BUSY|ATA_STAT_ERR)) != ATA_STAT_DRQ) {
			printf ("Error (no IRQ) dev %d blk %ld: status 0x%02x\n",
				device, blknr, c);
			break;
		}

		input_data (device, buffer, ATA_SECTORWORDS);
		(void) ide_inb (device, ATA_STATUS);	/* clear IRQ */

		++n;
		++blknr;
		buffer += ATA_SECTORWORDS;
	}
IDE_READ_E:
	ide_led (DEVICE_LED(device), 0);	/* LED off	*/
	return (n);
}

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


ulong ide_write (int device, ulong blknr, ulong blkcnt, ulong *buffer)
{
	ulong n = 0;
	unsigned char c;

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

	/* 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;
		}

		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);
		ide_outb (device, ATA_DEV_HD,   ATA_LBA		|
					    ATA_DEVICE(device)	|
					    ((blknr >> 24) & 0xF) );
		ide_outb (device, ATA_COMMAND,  ATA_CMD_WRITE);

		udelay (50);

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

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

		output_data (device, buffer, ATA_SECTORWORDS);
		c = ide_inb (device, ATA_STATUS);	/* clear IRQ */
		++n;
		++blknr;
		buffer += ATA_SECTORWORDS;
	}
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
 */
static void ident_cpy (unsigned char *dest, unsigned char *src, unsigned int len)
{
	int start,end;

	start=0;
	while (start<len) {
		if (src[start]!=' ')
			break;
		start++;
	}
	end=len-1;
	while (end>start) {
		if (src[end]!=' ')
			break;
		end--;
	}
	for ( ; start<=end; start++) {
		*dest++=src[start];
	}
	*dest='\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)
{
#if defined(CFG_PB_12V_ENABLE) || defined(CFG_PB_IDE_MOTOR)
	volatile immap_t *immr = (immap_t *)CFG_IMMR;
#endif
	int i;

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

	ide_set_reset (1); /* assert reset */

	WATCHDOG_RESET();

#ifdef CFG_PB_12V_ENABLE
	immr->im_cpm.cp_pbdat &= ~(CFG_PB_12V_ENABLE);	/* 12V Enable output OFF */
	immr->im_cpm.cp_pbpar &= ~(CFG_PB_12V_ENABLE);
	immr->im_cpm.cp_pbodr &= ~(CFG_PB_12V_ENABLE);
	immr->im_cpm.cp_pbdir |=   CFG_PB_12V_ENABLE;

	/* wait 500 ms for the voltage to stabilize
	 */
	for (i=0; i<500; ++i) {
		udelay (1000);
	}

	immr->im_cpm.cp_pbdat |=   CFG_PB_12V_ENABLE;	/* 12V Enable output ON */
#endif	/* CFG_PB_12V_ENABLE */

#ifdef CFG_PB_IDE_MOTOR
	/* configure IDE Motor voltage monitor pin as input */
	immr->im_cpm.cp_pbpar &= ~(CFG_PB_IDE_MOTOR);
	immr->im_cpm.cp_pbodr &= ~(CFG_PB_IDE_MOTOR);
	immr->im_cpm.cp_pbdir &= ~(CFG_PB_IDE_MOTOR);

	/* wait up to 1 s for the motor voltage to stabilize
	 */
	for (i=0; i<1000; ++i) {
		if ((immr->im_cpm.cp_pbdat & CFG_PB_IDE_MOTOR) != 0) {
			break;
		}
		udelay (1000);
	}

	if (i == 1000) {	/* Timeout */
		printf ("\nWarning: 5V for IDE Motor missing\n");
# ifdef CONFIG_STATUS_LED
#  ifdef STATUS_LED_YELLOW
		status_led_set  (STATUS_LED_YELLOW, STATUS_LED_ON );
#  endif
#  ifdef STATUS_LED_GREEN
		status_led_set  (STATUS_LED_GREEN,  STATUS_LED_OFF);
#  endif
# endif	/* CONFIG_STATUS_LED */
	}
#endif	/* CFG_PB_IDE_MOTOR */

	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_IDE_LED) && !defined(CONFIG_AMIGAONEG3SE) && !defined(CONFIG_KUP4K)

static	uchar	led_buffer = 0;		/* Buffer for current LED status	*/

static void ide_led (uchar led, uchar status)
{
	uchar *led_port = LED_PORT;

	if (status)	{		/* switch LED on	*/
		led_buffer |=  led;
	} else {			/* switch LED off	*/
		led_buffer &= ~led;
	}

	*led_port = led_buffer;
}

#endif	/* CONFIG_IDE_LED */

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

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


#undef	ATAPI_DEBUG

#ifdef	ATAPI_DEBUG
#define	AT_PRINTF(fmt,args...)	printf (fmt ,##args)
#else
#define AT_PRINTF(fmt,args...)
#endif

#ifdef __PPC__
/* since ATAPI may use commands with not 4 bytes alligned length
 * we have our own transfer functions, 2 bytes alligned */
static void
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;
	while (shorts--) {
		__asm__ volatile ("eieio");
		*pbuf = *dbuf++;
	}
}

static void
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;
	while (shorts--) {
		__asm__ volatile ("eieio");
		*dbuf++ = *pbuf;
	}
}

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


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

#endif	/* __PPC__ */

/*
 * 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;

	c = ide_inb(dev,ATA_DEV_CTL); /* prevents to read the status before valid */
	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;
#ifdef	CONFIG_AMIGAONEG3SE
# warning THF: Removed LBA mode ???
#endif
	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));
#ifdef	CONFIG_AMIGAONEG3SE
# warning THF: Removed LBA mode ???
#endif
	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 ("ATTAPI_ISSUE: Error (no IRQ) before sending ccb dev %d status 0x%02x\n",device,c);
		err=0xFF;
		goto AI_OUT;
	}

	output_data_shorts (device, (unsigned short *)ccb,ccblen/2); /* write command block */
 	/* 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;
			AT_PRINTF("atapi_issue 1 returned sense key %X status %02X\n",err,c);
		} else {
			printf ("ATTAPI_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) {
		AT_PRINTF("WARNING, transfer bytes %d not equal with requested %d\n",n,buflen);
	}
	if(n!=0) { /* data transfer */
		AT_PRINTF("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) {
			AT_PRINTF("Write to device\n");
			output_data_shorts(device,(unsigned short *)buffer,n);
		} else {
			AT_PRINTF("Read from device @ %p shorts %d\n",buffer,n);
			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);
		AT_PRINTF("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;

#ifdef CONFIG_AMIGAONEG3SE
	char *s;
	unsigned int timeout, retrycnt;

	s = getenv("ide_cd_timeout");
	timeout = s ? (simple_strtol(s, NULL, 10)*1000000)/5 : 0;

	retrycnt = 0;
#endif

	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 */

	AT_PRINTF("(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]);

	AT_PRINTF("ATAPI_CMD_REQ_SENSE returned %x\n",res);
	AT_PRINTF(" 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) {
		AT_PRINTF("Media not present\n");
		goto error;
	}

#ifdef CONFIG_AMIGAONEG3SE
	if ((sense_data[2]&0xF)==0x0B) {
		AT_PRINTF("ABORTED COMMAND...retry\n");
		if (retrycnt++ < 4)
			goto retry;
		return (0xFF);
	}

	if ((sense_data[2]&0xf) == 0x02 &&
	    sense_data[12] == 0x04	&&
	    sense_data[13] == 0x01	) {
		AT_PRINTF("Waiting for unit to become active\n");
		udelay(timeout);
		if (retrycnt++ < 4)
			goto retry;
		return 0xFF;
	}
#endif	/* CONFIG_AMIGAONEG3SE */

	printf ("ERROR: Unknown Sense key %02X ASC %02X ASCQ %02X\n",key,asc,ascq);
error:
	AT_PRINTF ("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);

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

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

	AT_PRINTF("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);

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

	AT_PRINTF("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]);
	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	/* max blocks */

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

	AT_PRINTF("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 count */
		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/4); /* ulong blocksize in ulong */
	} while (blkcnt > 0);
	return (n);
}

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

#endif /* CONFIG_ATAPI */

U_BOOT_CMD(
	ide,  5,  1,  do_ide,
	"ide     - IDE sub-system\n",
	"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'\n"
);

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

#endif	/* CONFIG_COMMANDS & CFG_CMD_IDE */