common/cmd_ide.c

/*
 * (C) Copyright 2000-2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 */

/*
 * IDE support
 */
#include <common.h>
#include <config.h>
#include <watchdog.h>
#include <command.h>
#include <image.h>
#include <asm/byteorder.h>
#if defined(CONFIG_IDE_8xx_DIRECT) || defined(CONFIG_IDE_PCMCIA)
# include <pcmcia.h>
#endif
#ifdef CONFIG_8xx
# include <mpc8xx.h>
#endif
#include <ide.h>
#include <ata.h>
#include <cmd_ide.h>
#include <cmd_disk.h>
#ifdef CONFIG_STATUS_LED
# include <status_led.h>
#endif

#ifdef CONFIG_SHOW_BOOT_PROGRESS
# include <status_led.h>
# define SHOW_BOOT_PROGRESS(arg)	show_boot_progress(arg)
#else
# define SHOW_BOOT_PROGRESS(arg)
#endif


#undef	IDE_DEBUG

#ifdef	IDE_DEBUG
#define	PRINTF(fmt,args...)	printf (fmt ,##args)
#else
#define PRINTF(fmt,args...)
#endif

#if (CONFIG_COMMANDS & CFG_CMD_IDE)

/* Timings for IDE Interface
 *
 * SETUP / LENGTH / HOLD - cycles valid for 50 MHz clk
 * 70	   165	    30	   PIO-Mode 0, [ns]
 *  4	     9	     2		       [Cycles]
 * 50	   125	    20	   PIO-Mode 1, [ns]
 *  3	     7	     2		       [Cycles]
 * 30	   100	    15	   PIO-Mode 2, [ns]
 *  2	     6	     1		       [Cycles]
 * 30	    80	    10	   PIO-Mode 3, [ns]
 *  2	     5	     1		       [Cycles]
 * 25	    70	    10	   PIO-Mode 4, [ns]
 *  2	     4	     1		       [Cycles]
 */

const static pio_config_t pio_config_ns [IDE_MAX_PIO_MODE+1] =
{
    /*	Setup  Length  Hold  */
	{ 70,	165,	30 },		/* PIO-Mode 0, [ns]	*/
	{ 50,	125,	20 },		/* PIO-Mode 1, [ns]	*/
	{ 30,	101,	15 },		/* PIO-Mode 2, [ns]	*/
	{ 30,	 80,	10 },		/* PIO-Mode 3, [ns]	*/
	{ 25,	 70,	10 },		/* PIO-Mode 4, [ns]	*/
};

static pio_config_t pio_config_clk [IDE_MAX_PIO_MODE+1];

#ifndef	CFG_PIO_MODE
#define	CFG_PIO_MODE	0		/* use a relaxed default */
#endif
static int pio_mode = CFG_PIO_MODE;

/* Make clock cycles and always round up */

#define PCMCIA_MK_CLKS( t, T ) (( (t) * (T) + 999U ) / 1000U )

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

/* Current I/O Device	*/
static int curr_device = -1;

/* Current offset for IDE0 / IDE1 bus access	*/
ulong ide_bus_offset[CFG_IDE_MAXBUS] = {
#if defined(CFG_ATA_IDE0_OFFSET)
	CFG_ATA_IDE0_OFFSET,
#endif
#if defined(CFG_ATA_IDE1_OFFSET) && (CFG_IDE_MAXBUS > 1)
	CFG_ATA_IDE1_OFFSET,
#endif
};

#define	ATA_CURR_BASE(dev)	(CFG_ATA_BASE_ADDR+ide_bus_offset[IDE_BUS(dev)])

static int	    ide_bus_ok[CFG_IDE_MAXBUS];

static  block_dev_desc_t ide_dev_desc[CFG_IDE_MAXDEVICE];
/* ------------------------------------------------------------------------- */

#ifdef CONFIG_IDE_LED
static void  ide_led   (uchar led, uchar status);
#else
#define ide_led(a,b)	/* dummy */
#endif

#ifdef CONFIG_IDE_RESET
static void  ide_reset (void);
#else
#define ide_reset()	/* dummy */
#endif

static void  ide_ident (block_dev_desc_t *dev_desc);
static uchar ide_wait  (int dev, ulong t);

#define IDE_TIME_OUT	2000	/* 2 sec timeout */

#define ATAPI_TIME_OUT	7000	/* 7 sec timeout (5 sec seems to work...) */

#define IDE_SPIN_UP_TIME_OUT 5000 /* 5 sec spin-up timeout */

static void __inline__ outb(int dev, int port, unsigned char val);
static unsigned char __inline__ inb(int dev, int port);
static void input_swap_data(int dev, ulong *sect_buf, int words);
static void input_data(int dev, ulong *sect_buf, int words);
static void output_data(int dev, ulong *sect_buf, int words);
static void ident_cpy (unsigned char *dest, unsigned char *src, unsigned int len);


#ifdef CONFIG_ATAPI
static void	atapi_inquiry(block_dev_desc_t *dev_desc);
ulong atapi_read (int device, ulong blknr, ulong blkcnt, ulong *buffer);
#endif


#ifdef CONFIG_IDE_8xx_DIRECT
static void set_pcmcia_timing (int pmode);
#else
#define set_pcmcia_timing(a)	/* dummy */
#endif

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

int do_ide (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
    int rcode = 0;

    switch (argc) {
    case 0:
    case 1:
	printf ("Usage:\n%s\n", cmdtp->usage);
	return 1;
    case 2:
	if (strncmp(argv[1],"res",3) == 0) {
		puts ("\nReset IDE"
#ifdef CONFIG_IDE_8xx_DIRECT
			" on PCMCIA " PCMCIA_SLOT_MSG
#endif
			": ");

		ide_init ();
		return 0;
	} else if (strncmp(argv[1],"inf",3) == 0) {
		int i;

		putc ('\n');

		for (i=0; i<CFG_IDE_MAXDEVICE; ++i) {
			if (ide_dev_desc[i].type==DEV_TYPE_UNKNOWN)
				continue; /* list only known devices */
			printf ("IDE device %d: ", i);
			dev_print(&ide_dev_desc[i]);
		}
		return 0;

	} else if (strncmp(argv[1],"dev",3) == 0) {
		if ((curr_device < 0) || (curr_device >= CFG_IDE_MAXDEVICE)) {
			puts ("\nno IDE devices available\n");
			return 1;
		}
		printf ("\nIDE device %d: ", curr_device);
		dev_print(&ide_dev_desc[curr_device]);
		return 0;
	} else if (strncmp(argv[1],"part",4) == 0) {
		int dev, ok;

		for (ok=0, dev=0; dev<CFG_IDE_MAXDEVICE; ++dev) {
			if (ide_dev_desc[dev].part_type!=PART_TYPE_UNKNOWN) {
				++ok;
				if (dev)
					putc ('\n');
				print_part(&ide_dev_desc[dev]);
			}
		}
		if (!ok) {
			puts ("\nno IDE devices available\n");
			rcode ++;
		}
		return rcode;
	}
	printf ("Usage:\n%s\n", cmdtp->usage);
	return 1;
    case 3:
	if (strncmp(argv[1],"dev",3) == 0) {
		int dev = (int)simple_strtoul(argv[2], NULL, 10);

		printf ("\nIDE device %d: ", dev);
		if (dev >= CFG_IDE_MAXDEVICE) {
			puts ("unknown device\n");
			return 1;
		}
		dev_print(&ide_dev_desc[dev]);
		/*ide_print (dev);*/

		if (ide_dev_desc[dev].type == DEV_TYPE_UNKNOWN) {
			return 1;
		}

		curr_device = dev;

		puts ("... is now current device\n");

		return 0;
	} else if (strncmp(argv[1],"part",4) == 0) {
		int dev = (int)simple_strtoul(argv[2], NULL, 10);

		if (ide_dev_desc[dev].part_type!=PART_TYPE_UNKNOWN) {
				print_part(&ide_dev_desc[dev]);
		} else {
			printf ("\nIDE device %d not available\n", dev);
			rcode = 1;
		}
		return rcode;
#if 0
	} else if (strncmp(argv[1],"pio",4) == 0) {
		int mode = (int)simple_strtoul(argv[2], NULL, 10);

		if ((mode >= 0) && (mode <= IDE_MAX_PIO_MODE)) {
			puts ("\nSetting ");
			pio_mode = mode;
			ide_init ();
		} else {
			printf ("\nInvalid PIO mode %d (0 ... %d only)\n",
				mode, IDE_MAX_PIO_MODE);
		}
		return;
#endif
	}

	printf ("Usage:\n%s\n", cmdtp->usage);
	return 1;
    default:
	/* at least 4 args */

	if (strcmp(argv[1],"read") == 0) {
		ulong addr = simple_strtoul(argv[2], NULL, 16);
		ulong blk  = simple_strtoul(argv[3], NULL, 16);
		ulong cnt  = simple_strtoul(argv[4], NULL, 16);
		ulong n;

		printf ("\nIDE read: device %d block # %ld, count %ld ... ",
			curr_device, blk, cnt);

		n = ide_dev_desc[curr_device].block_read (curr_device,
							  blk, cnt,
							  (ulong *)addr);
		/* flush cache after read */
		flush_cache (addr, cnt*ide_dev_desc[curr_device].blksz);

		printf ("%ld blocks read: %s\n",
			n, (n==cnt) ? "OK" : "ERROR");
		if (n==cnt) {
			return 0;
		} else {
			return 1;
		}
	} else if (strcmp(argv[1],"write") == 0) {
		ulong addr = simple_strtoul(argv[2], NULL, 16);
		ulong blk  = simple_strtoul(argv[3], NULL, 16);
		ulong cnt  = simple_strtoul(argv[4], NULL, 16);
		ulong n;

		printf ("\nIDE write: device %d block # %ld, count %ld ... ",
			curr_device, blk, cnt);

		n = ide_write (curr_device, blk, cnt, (ulong *)addr);

		printf ("%ld blocks written: %s\n",
			n, (n==cnt) ? "OK" : "ERROR");
		if (n==cnt) {
			return 0;
		} else {
			return 1;
		}
	} else {
		printf ("Usage:\n%s\n", cmdtp->usage);
		rcode = 1;
	}

	return rcode;
    }
}

int do_diskboot (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	char *boot_device = NULL;
	char *ep;
	int dev, part = 0;
	ulong cnt;
	ulong addr;
	disk_partition_t info;
	image_header_t *hdr;
	int rcode = 0;

	switch (argc) {
	case 1:
		addr = CFG_LOAD_ADDR;
		boot_device = getenv ("bootdevice");
		break;
	case 2:
		addr = simple_strtoul(argv[1], NULL, 16);
		boot_device = getenv ("bootdevice");
		break;
	case 3:
		addr = simple_strtoul(argv[1], NULL, 16);
		boot_device = argv[2];
		break;
	default:
		printf ("Usage:\n%s\n", cmdtp->usage);
		SHOW_BOOT_PROGRESS (-1);
		return 1;
	}

	if (!boot_device) {
		puts ("\n** No boot device **\n");
		SHOW_BOOT_PROGRESS (-1);
		return 1;
	}

	dev = simple_strtoul(boot_device, &ep, 16);

	if (ide_dev_desc[dev].type==DEV_TYPE_UNKNOWN) {
		printf ("\n** Device %d not available\n", dev);
		SHOW_BOOT_PROGRESS (-1);
		return 1;
	}

	if (*ep) {
		if (*ep != ':') {
			puts ("\n** Invalid boot device, use `dev[:part]' **\n");
			SHOW_BOOT_PROGRESS (-1);
			return 1;
		}
		part = simple_strtoul(++ep, NULL, 16);
	}
	if (get_partition_info (&ide_dev_desc[dev], part, &info)) {
		SHOW_BOOT_PROGRESS (-1);
		return 1;
	}
	if (strncmp(info.type, BOOT_PART_TYPE, sizeof(info.type)) != 0) {
		printf ("\n** Invalid partition type \"%.32s\""
			" (expect \"" BOOT_PART_TYPE "\")\n",
			info.type);
		SHOW_BOOT_PROGRESS (-1);
		return 1;
	}

	printf ("\nLoading from IDE device %d, partition %d: "
		"Name: %.32s  Type: %.32s\n",
		dev, part, info.name, info.type);

	PRINTF ("First Block: %ld,  # of blocks: %ld, Block Size: %ld\n",
		info.start, info.size, info.blksz);

	if (ide_dev_desc[dev].block_read (dev, info.start, 1, (ulong *)addr) != 1) {
		printf ("** Read error on %d:%d\n", dev, part);
		SHOW_BOOT_PROGRESS (-1);
		return 1;
	}

	hdr = (image_header_t *)addr;

	if (ntohl(hdr->ih_magic) == IH_MAGIC) {

		print_image_hdr (hdr);

		cnt = (ntohl(hdr->ih_size) + sizeof(image_header_t));
		cnt += info.blksz - 1;
		cnt /= info.blksz;
		cnt -= 1;
	} else {
		printf("\n** Bad Magic Number **\n");
		SHOW_BOOT_PROGRESS (-1);
		return 1;
	}

	if (ide_dev_desc[dev].block_read (dev, info.start+1, cnt,
		      (ulong *)(addr+info.blksz)) != cnt) {
		printf ("** Read error on %d:%d\n", dev, part);
		SHOW_BOOT_PROGRESS (-1);
		return 1;
	}


	/* Loading ok, update default load address */

	load_addr = addr;

	/* Check if we should attempt an auto-start */
	if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) {
		char *local_args[2];
		extern int do_bootm (cmd_tbl_t *, int, int, char *[]);

		local_args[0] = argv[0];
		local_args[1] = NULL;

		printf ("Automatic boot of image at addr 0x%08lX ...\n", addr);

		do_bootm (cmdtp, 0, 1, local_args);
		rcode = 1;
	}
	return rcode;
}

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

void ide_init (void)
{
	DECLARE_GLOBAL_DATA_PTR;

#ifdef CONFIG_IDE_8xx_DIRECT
	volatile immap_t *immr = (immap_t *)CFG_IMMR;
	volatile pcmconf8xx_t *pcmp = &(immr->im_pcmcia);
#endif
	unsigned char c;
	int i, bus;

#ifdef CONFIG_IDE_8xx_PCCARD
	extern int pcmcia_on (void);

	WATCHDOG_RESET();

	/* initialize the PCMCIA IDE adapter card */
	if (pcmcia_on())
		return;
	udelay (1000000);	/* 1 s */
#endif	/* CONFIG_IDE_8xx_PCCARD */

	WATCHDOG_RESET();

	/* Initialize PIO timing tables */
	for (i=0; i <= IDE_MAX_PIO_MODE; ++i) {
	    pio_config_clk[i].t_setup  = PCMCIA_MK_CLKS(pio_config_ns[i].t_setup,
							    gd->bus_clk);
	    pio_config_clk[i].t_length = PCMCIA_MK_CLKS(pio_config_ns[i].t_length,
							    gd->bus_clk);
	    pio_config_clk[i].t_hold   = PCMCIA_MK_CLKS(pio_config_ns[i].t_hold,
							    gd->bus_clk);
	    PRINTF ("PIO Mode %d: setup=%2d ns/%d clk"
		    "  len=%3d ns/%d clk"
		    "  hold=%2d ns/%d clk\n",
		    i,
		    pio_config_ns[i].t_setup,  pio_config_clk[i].t_setup,
		    pio_config_ns[i].t_length, pio_config_clk[i].t_length,
		    pio_config_ns[i].t_hold,   pio_config_clk[i].t_hold);
	}

	/* Reset the IDE just to be sure.
	 * Light LED's to show
	 */
	ide_led ((LED_IDE1 | LED_IDE2), 1);		/* LED's on	*/
	ide_reset (); /* ATAPI Drives seems to need a proper IDE Reset */

#ifdef CONFIG_IDE_8xx_DIRECT
	/* PCMCIA / IDE initialization for common mem space */
	pcmp->pcmc_pgcrb = 0;
#endif

	/* start in PIO mode 0 - most relaxed timings */
	pio_mode = 0;
	set_pcmcia_timing (pio_mode);

	/*
	 * Wait for IDE to get ready.
	 * According to spec, this can take up to 31 seconds!
	 */
	for (bus=0; bus<CFG_IDE_MAXBUS; ++bus) {
		int dev = bus * (CFG_IDE_MAXDEVICE / CFG_IDE_MAXBUS);

		printf ("Bus %d: ", bus);

		ide_bus_ok[bus] = 0;

		/* Select device
		 */
		udelay (100000);		/* 100 ms */
		outb (dev, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(dev));
		udelay (100000);		/* 100 ms */

		i = 0;
		do {
			udelay (10000);		/* 10 ms */

			c = inb (dev, ATA_STATUS);
			i++;
			if (i > (ATA_RESET_TIME * 100)) {
				puts ("** Timeout **\n");
				ide_led ((LED_IDE1 | LED_IDE2), 0); /* LED's off */
				return;
			}
			if ((i >= 100) && ((i%100)==0)) {
				putc ('.');
			}
		} while (c & ATA_STAT_BUSY);

		if (c & (ATA_STAT_BUSY | ATA_STAT_FAULT)) {
			puts ("not available  ");
			PRINTF ("Status = 0x%02X ", c);
#ifndef CONFIG_ATAPI /* ATAPI Devices do not set DRDY */
		} else  if ((c & ATA_STAT_READY) == 0) {
			puts ("not available  ");
			PRINTF ("Status = 0x%02X ", c);
#endif
		} else {
			puts ("OK ");
			ide_bus_ok[bus] = 1;
		}
		WATCHDOG_RESET();
	}
	putc ('\n');

	ide_led ((LED_IDE1 | LED_IDE2), 0);	/* LED's off	*/

	curr_device = -1;
	for (i=0; i<CFG_IDE_MAXDEVICE; ++i) {
#ifdef CONFIG_IDE_LED
		int led = (IDE_BUS(i) == 0) ? LED_IDE1 : LED_IDE2;
#endif
		ide_dev_desc[i].if_type=IF_TYPE_IDE;
		ide_dev_desc[i].dev=i;
		ide_dev_desc[i].part_type=PART_TYPE_UNKNOWN;
		ide_dev_desc[i].blksz=0;
		ide_dev_desc[i].lba=0;
		ide_dev_desc[i].block_read=ide_read;
		if (!ide_bus_ok[IDE_BUS(i)])
			continue;
		ide_led (led, 1);		/* LED on	*/
		ide_ident(&ide_dev_desc[i]);
		ide_led (led, 0);		/* LED off	*/
		dev_print(&ide_dev_desc[i]);
/*		ide_print (i); */
		if ((ide_dev_desc[i].lba > 0) && (ide_dev_desc[i].blksz > 0)) {
			init_part (&ide_dev_desc[i]);			/* initialize partition type */
			if (curr_device < 0)
				curr_device = i;
		}
	}
	WATCHDOG_RESET();
}

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

block_dev_desc_t * ide_get_dev(int dev)
{
	return ((block_dev_desc_t *)&ide_dev_desc[dev]);
}


#ifdef CONFIG_IDE_8xx_DIRECT

static void
set_pcmcia_timing (int pmode)
{
	volatile immap_t *immr = (immap_t *)CFG_IMMR;
	volatile pcmconf8xx_t *pcmp = &(immr->im_pcmcia);
	ulong timings;

	PRINTF ("Set timing for PIO Mode %d\n", pmode);

	timings = PCMCIA_SHT(pio_config_clk[pmode].t_hold)
		| PCMCIA_SST(pio_config_clk[pmode].t_setup)
		| PCMCIA_SL (pio_config_clk[pmode].t_length)
		;

	/* IDE 0
	 */
	pcmp->pcmc_pbr0 = CFG_PCMCIA_PBR0;
	pcmp->pcmc_por0 = CFG_PCMCIA_POR0
#if (CFG_PCMCIA_POR0 != 0)
			| timings
#endif
			;
	PRINTF ("PBR0: %08x  POR0: %08x\n", pcmp->pcmc_pbr0, pcmp->pcmc_por0);

	pcmp->pcmc_pbr1 = CFG_PCMCIA_PBR1;
	pcmp->pcmc_por1 = CFG_PCMCIA_POR1
#if (CFG_PCMCIA_POR1 != 0)
			| timings
#endif
			;
	PRINTF ("PBR1: %08x  POR1: %08x\n", pcmp->pcmc_pbr1, pcmp->pcmc_por1);

	pcmp->pcmc_pbr2 = CFG_PCMCIA_PBR2;
	pcmp->pcmc_por2 = CFG_PCMCIA_POR2
#if (CFG_PCMCIA_POR2 != 0)
			| timings
#endif
			;
	PRINTF ("PBR2: %08x  POR2: %08x\n", pcmp->pcmc_pbr2, pcmp->pcmc_por2);

	pcmp->pcmc_pbr3 = CFG_PCMCIA_PBR3;
	pcmp->pcmc_por3 = CFG_PCMCIA_POR3
#if (CFG_PCMCIA_POR3 != 0)
			| timings
#endif
			;
	PRINTF ("PBR3: %08x  POR3: %08x\n", pcmp->pcmc_pbr3, pcmp->pcmc_por3);

	/* IDE 1
	 */
	pcmp->pcmc_pbr4 = CFG_PCMCIA_PBR4;
	pcmp->pcmc_por4 = CFG_PCMCIA_POR4
#if (CFG_PCMCIA_POR4 != 0)
			| timings
#endif
			;
	PRINTF ("PBR4: %08x  POR4: %08x\n", pcmp->pcmc_pbr4, pcmp->pcmc_por4);

	pcmp->pcmc_pbr5 = CFG_PCMCIA_PBR5;
	pcmp->pcmc_por5 = CFG_PCMCIA_POR5
#if (CFG_PCMCIA_POR5 != 0)
			| timings
#endif
			;
	PRINTF ("PBR5: %08x  POR5: %08x\n", pcmp->pcmc_pbr5, pcmp->pcmc_por5);

	pcmp->pcmc_pbr6 = CFG_PCMCIA_PBR6;
	pcmp->pcmc_por6 = CFG_PCMCIA_POR6
#if (CFG_PCMCIA_POR6 != 0)
			| timings
#endif
			;
	PRINTF ("PBR6: %08x  POR6: %08x\n", pcmp->pcmc_pbr6, pcmp->pcmc_por6);

	pcmp->pcmc_pbr7 = CFG_PCMCIA_PBR7;
	pcmp->pcmc_por7 = CFG_PCMCIA_POR7
#if (CFG_PCMCIA_POR7 != 0)
			| timings
#endif
			;
	PRINTF ("PBR7: %08x  POR7: %08x\n", pcmp->pcmc_pbr7, pcmp->pcmc_por7);

}

#endif	/* CONFIG_IDE_8xx_DIRECT */

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

static void __inline__
outb(int dev, int port, unsigned char val)
{
	/* Ensure I/O operations complete */
	__asm__ volatile("eieio");
	*((uchar *)(ATA_CURR_BASE(dev)+port)) = val;
#if 0
	printf ("OUTB: 0x%08lx <== 0x%02x\n", ATA_CURR_BASE(dev)+port, val);
#endif
}

static unsigned char __inline__
inb(int dev, int port)
{
	uchar val;
	/* Ensure I/O operations complete */
	__asm__ volatile("eieio");
	val = *((uchar *)(ATA_CURR_BASE(dev)+port));
#if 0
	printf ("INB: 0x%08lx ==> 0x%02x\n", ATA_CURR_BASE(dev)+port, val);
#endif
	return (val);
}

__inline__ unsigned ld_le16(const volatile unsigned short *addr)
{
	unsigned val;

	__asm__ __volatile__ ("lhbrx %0,0,%1" : "=r"(val) : "r"(addr), "m"(*addr));
	return val;
}

static void
input_swap_data(int dev, ulong *sect_buf, int words)
{
	volatile ushort	*pbuf = (ushort *)(ATA_CURR_BASE(dev)+ATA_DATA_REG);
	ushort	*dbuf = (ushort *)sect_buf;

	while (words--) {
		*dbuf++ = ld_le16(pbuf);
		*dbuf++ = ld_le16(pbuf);
	}
}

static void
output_data(int dev, ulong *sect_buf, int words)
{
	ushort	*dbuf;
	volatile ushort	*pbuf;

	pbuf = (ushort *)(ATA_CURR_BASE(dev)+ATA_DATA_REG);
	dbuf = (ushort *)sect_buf;
	while (words--) {
		__asm__ volatile ("eieio");
		*pbuf = *dbuf++;
		__asm__ volatile ("eieio");
		*pbuf = *dbuf++;
	}
}

static void
input_data(int dev, ulong *sect_buf, int words)
{
	ushort	*dbuf;
	volatile ushort	*pbuf;

	pbuf = (ushort *)(ATA_CURR_BASE(dev)+ATA_DATA_REG);
	dbuf = (ushort *)sect_buf;
	while (words--) {
		__asm__ volatile ("eieio");
		*dbuf++ = *pbuf;
		__asm__ volatile ("eieio");
		*dbuf++ = *pbuf;
	}
}

/* -------------------------------------------------------------------------
 */
static void ide_ident (block_dev_desc_t *dev_desc)
{
	ulong iobuf[ATA_SECTORWORDS];
	unsigned char c;
	hd_driveid_t *iop = (hd_driveid_t *)iobuf;

#if 0
	int mode, cycle_time;
#endif
	int device;
	device=dev_desc->dev;
	printf ("  Device %d: ", device);

	ide_led (DEVICE_LED(device), 1);	/* LED on	*/
	/* Select device
	 */
	outb (device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));
	dev_desc->if_type=IF_TYPE_IDE;
#ifdef CONFIG_ATAPI
	/* check signature */
	if ((inb(device,ATA_SECT_CNT)==0x01) &&
		 (inb(device,ATA_SECT_NUM)==0x01) &&
		 (inb(device,ATA_CYL_LOW)==0x14) &&
		 (inb(device,ATA_CYL_HIGH)==0xEB)) {
		/* ATAPI Signature found */
		dev_desc->if_type=IF_TYPE_ATAPI;
		/* Start Ident Command
		 */
		outb (device, ATA_COMMAND, ATAPI_CMD_IDENT);
		/*
		 * Wait for completion - ATAPI devices need more time
		 * to become ready
		 */
		c = ide_wait (device, ATAPI_TIME_OUT);
	}
	else
#endif
	{
		/* Start Ident Command
		 */
		outb (device, ATA_COMMAND, ATA_CMD_IDENT);

		/* Wait for completion
		 */
		c = ide_wait (device, IDE_TIME_OUT);
	}
	ide_led (DEVICE_LED(device), 0);	/* LED off	*/

	if (((c & ATA_STAT_DRQ) == 0) ||
	    ((c & (ATA_STAT_FAULT|ATA_STAT_ERR)) != 0) ) {
		dev_desc->type=DEV_TYPE_UNKNOWN;
		return;
	}

	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 */
	outb (device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));
	c = ide_wait (device, IDE_TIME_OUT);
	outb (device, ATA_SECT_CNT, 1);
	outb (device, ATA_LBA_LOW,  0);
	outb (device, ATA_LBA_MID,  0);
	outb (device, ATA_LBA_HIGH, 0);
	outb (device, ATA_DEV_HD,   ATA_LBA		|
				    ATA_DEVICE(device));
	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
	 */
	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 */
	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 = 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;
		}

		outb (device, ATA_SECT_CNT, 1);
		outb (device, ATA_LBA_LOW,  (blknr >>  0) & 0xFF);
		outb (device, ATA_LBA_MID,  (blknr >>  8) & 0xFF);
		outb (device, ATA_LBA_HIGH, (blknr >> 16) & 0xFF);
		outb (device, ATA_DEV_HD,   ATA_LBA		|
					    ATA_DEVICE(device)	|
					    ((blknr >> 24) & 0xF) );
		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) 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
	 */
	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;
		}

		outb (device, ATA_SECT_CNT, 1);
		outb (device, ATA_LBA_LOW,  (blknr >>  0) & 0xFF);
		outb (device, ATA_LBA_MID,  (blknr >>  8) & 0xFF);
		outb (device, ATA_LBA_HIGH, (blknr >> 16) & 0xFF);
		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 */