cmd_ide.c

		outb (device, ATA_DEV_HD,   ATA_LBA		|
					    ATA_DEVICE(device)	|
					    ((blknr >> 24) & 0xF) );
		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 = 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 = 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 */

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

#ifdef CONFIG_IDE_LED

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

/* 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;
	}
}

/*
 * 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 = inb(dev,ATA_DEV_CTL); /* prevents to read the status before valid */
	while (((c = 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;
	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 */
	outb (device, ATA_ERROR_REG, 0); /* no DMA, no overlaped */
	outb (device, ATA_CYL_LOW,  (unsigned char)(buflen & 0xFF));
	outb (device, ATA_CYL_HIGH, (unsigned char)((buflen<<8) & 0xFF));
	outb (device, ATA_DEV_HD,   ATA_LBA | ATA_DEVICE(device));

	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=(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=inb(device, ATA_CYL_HIGH);
	n<<=8;
	n+=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 ((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=(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;

	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 Legnth */

	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;
	}
	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 */

#endif	/* CONFIG_COMMANDS & CFG_CMD_IDE */