board/mv_feroceon/USP/mv_mmc.c

/*
 * (C) Copyright 2003
 * Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
 *
 * 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
 */
#include <common.h>
#if defined(CONFIG_CMD_MMC)
#include <config.h>
#include <mmc.h>
#include <fat.h>
#include <asm/errno.h>
#include <part.h>
#include "mv_mmc.h"
#include "mvOs.h"

static int is_sdhc;
//extern int fat_register_device(block_dev_desc_t *dev_desc, int part_no);
static block_dev_desc_t mmc_dev;

block_dev_desc_t *mmc_get_dev(int dev)
{
	return &mmc_dev;
}

/*
 * FIXME needs to read cid and csd info to determine block size
 * and other parameters
 */
static uchar mmc_buf[MMC_BLOCK_SIZE];
static struct mmc_csd mmc_csd_s;
static int mmc_ready = 0;
/* MMC_DEFAULT_RCA should probably be just 1, but this may break other code
   that expects it to be shifted. */
static u_int16_t rca = 0;

#ifdef DEBUG
static u_int32_t mmc_size(const struct mmc_csd *csd)
{
	u_int32_t block_len, mult, blocknr;
	block_len = csd->read_bl_len << 12;
	mult = csd->c_size_mult << 8;
	blocknr = (csd->c_size+1) * mult;
	return blocknr * block_len;
}
#endif
#if 0
static int isprint (unsigned char ch)
{
	if (ch >= 32 && ch < 127)
		return (1);
	return (0);
}

static int toprint(char *dst, char c)
{
	if (isprint(c)) {
		*dst = c;
		return 1;
	}
	return sprintf(dst,"\\x%02x", c);
}
#endif

#ifdef DEBUG
static void mmc_dump_cid(const struct mmc_cid *cid)
{
	printf("Manufacturer ID:       %02X\n", cid->mid);
	printf("OEM/Application ID:    %04X\n", cid->oid);
	printf("Product name:          %s\n", cid->pnm);
	printf("Product Revision:      %u.%u\n",
	       cid->prv >> 4, cid->prv & 0x0f);
	printf("Product Serial Number: %lu\n", cid->psn);
	printf("Manufacturing Date:    %02u/%02u\n",
	       cid->mdt >> 4, cid->mdt & 0x0f);
}

static void mmc_dump_csd(const struct mmc_csd *csd)
{
	unsigned long *csd_raw = (unsigned long *)csd;
	printf("CSD data: %08lx %08lx %08lx %08lx\n",
	       csd_raw[0], csd_raw[1], csd_raw[2], csd_raw[3]);
	printf("CSD structure version:   1.%u\n", csd->csd_structure);
	printf("MMC System Spec version: %u\n", csd->spec_vers);
	printf("Card command classes:    %03x\n", csd->ccc);
	printf("Read block length:       %u\n", 1 << csd->read_bl_len);
	if (csd->read_bl_partial)
		puts("Supports partial reads\n");
	else
		puts("Does not support partial reads\n");
	printf("Write block length:      %u\n", 1 << csd->write_bl_len);
	if (csd->write_bl_partial)
		puts("Supports partial writes\n");
	else
		puts("Does not support partial writes\n");
	if (csd->wp_grp_enable)
		printf("Supports group WP:      %u\n", csd->wp_grp_size + 1);
	else
		puts("Does not support group WP\n");
	printf("Card capacity:		%u bytes\n",
	       (csd->c_size + 1) * (1 << (csd->c_size_mult + 2)) *
	       (1 << csd->read_bl_len));
	printf("File format:            %u/%u\n",
	       csd->file_format_grp, csd->file_format);
	puts("Write protection:        ");
	if (csd->perm_write_protect)
		puts(" permanent");
	if (csd->tmp_write_protect)
		puts(" temporary");
	putc('\n');
}
#endif /* DEBUG */
#if 0
static void print_mmc_cid(struct mmc_cid *cid)
{
	printf("MMC found. Card desciption is:\n");
	printf("Manufacturer ID = %02x%02x%02x\n",
		cid->id[0], cid->id[1], cid->id[2]);
	printf("HW/FW Revision = %x %x\n",cid->hwrev, cid->fwrev);
	cid->hwrev = cid->fwrev = 0;	/* null terminate string */
	printf("Product Name = %s\n",cid->name);
	printf("Serial Number = %02x%02x%02x\n",
		cid->sn[0], cid->sn[1], cid->sn[2]);
	printf("Month = %d\n",cid->month);
	printf("Year = %d\n",1997 + cid->year);
}
static void print_sd_cid(struct mmc_csd *cid)
{
	int len;
	char tbuf[64];
	printf("SD%s found. Card desciption is:\n", is_sdhc?"HC":"");
	len = 0;
	len += toprint(&tbuf[len], cid->oid_0);
	len += toprint(&tbuf[len], cid->oid_1);
	tbuf[len] = 0;
	printf("Manufacturer:       0x%02x, OEM \"%s\"\n",
	    cid->mid, tbuf);
	len = 0;
	len += toprint(&tbuf[len], cid->pnm_0);
	len += toprint(&tbuf[len], cid->pnm_1);
	len += toprint(&tbuf[len], cid->pnm_2);
	len += toprint(&tbuf[len], cid->pnm_3);
	len += toprint(&tbuf[len], cid->pnm_4);
	tbuf[len] = 0;
	printf("Product name:       \"%s\", revision %d.%d\n",
		tbuf, 
	    cid->prv >> 4, cid->prv & 15);
	printf("Serial number:      %u\n",
	    cid->psn_0 << 24 | cid->psn_1 << 16 | cid->psn_2 << 8 |
	    cid->psn_3);
	printf("Manufacturing date: %d/%d\n",
	    cid->mdt_1 & 15,
	    2000+((cid->mdt_0 & 15) << 4)+((cid->mdt_1 & 0xf0) >> 4));
	printf("CRC:                0x%02x, b0 = %d\n",
	    cid->crc >> 1, cid->crc & 1);
}
#endif

static void mvsdmmc_set_clock(unsigned int clock)
{
	unsigned int m;
	m = MVSDMMC_BASE_FAST_CLOCK/(2*clock) - 1;
	debug("mvsdmmc_set_clock: dividor = 0x%x clock=%d\n",
		      m, clock);
	SDIO_REG_WRITE32(SDIO_CLK_DIV, m & 0x7ff);
	//if (isprint(1))
	udelay(10*1000);
}

static ulong * mmc_cmd(ulong cmd, ulong arg, ushort xfermode, ushort resptype, ushort waittype)
{
	static ulong resp[4];
	ushort done ;
	int err = 0 ;
	ulong curr, start, diff, hz;
	ushort response[8], resp_indx = 0;
	debug("mmc_cmd %x, arg: %x,xfer: %x,resp: %x, wait : %x\n", cmd, arg, xfermode, resptype, waittype);
	//clear status 
	SDIO_REG_WRITE16(SDIO_NOR_INTR_STATUS, 0xffff);
	SDIO_REG_WRITE16(SDIO_ERR_INTR_STATUS, 0xffff);
	start = get_ticks();
	hz = get_tbclk();
	while((SDIO_REG_READ16(SDIO_PRESENT_STATE0) & CARD_BUSY)) {
		curr = get_ticks();
		diff = (long) curr - (long) start;
		if (diff > (3*hz))
		{
			// 3 seconds timeout, card busy, can't sent cmd
			printf("card too busy \n");
			return 0;
		}
	}
	SDIO_REG_WRITE16(SDIO_ARG_LOW, (ushort)(arg&0xffff) );
   	SDIO_REG_WRITE16(SDIO_ARG_HI, (ushort)(arg>>16) );
	SDIO_REG_WRITE16(SDIO_XFER_MODE, xfermode);
	if( (cmd == MMC_CMD_READ_BLOCK) || (cmd == 25) )
	{
		SDIO_REG_WRITE16(SDIO_CMD, ((cmd << 8) | resptype | 0x3c ) );
		debug("cmd reg : %x\n", SDIO_REG_READ16( SDIO_CMD )) ;
	}
	else
	{
		SDIO_REG_WRITE16(SDIO_CMD, ((cmd << 8) | resptype ) );
	}
	done = SDIO_REG_READ16(SDIO_NOR_INTR_STATUS) & waittype;
	start = get_ticks();
	while( done!=waittype)
	{
		done = SDIO_REG_READ16(SDIO_NOR_INTR_STATUS) & waittype;
		if( SDIO_REG_READ16(SDIO_NOR_INTR_STATUS) & 0x8000 )
		{		
			printf("Error! cmd : %ld, err : %04x\n", cmd, SDIO_REG_READ16(SDIO_ERR_INTR_STATUS) ) ;
			return 0 ;	// error happen 
		}
		curr = get_ticks();
		diff = (long) curr - (long) start;
		if (diff > (3*hz))
		{
			printf("cmd timeout, status : %04x\n", SDIO_REG_READ16(SDIO_NOR_INTR_STATUS));
			printf("xfer mode : %04x\n", SDIO_REG_READ16(SDIO_XFER_MODE));
			err = 1 ;
			break;
		}
	}
	for (resp_indx = 0 ; resp_indx < 8; resp_indx++)
		response[resp_indx] = SDIO_REG_READ16(SDIO_RSP(resp_indx));
	memset(resp, 0, sizeof(resp));
	switch (resptype & 0x3) {
		case SDIO_CMD_RSP_48:
		case SDIO_CMD_RSP_48BUSY:
			resp[0] = ((response[2] & 0x3f) << (8 - 8)) |
				((response[1] & 0xffff) << (14 - 8)) |
				((response[0] & 0x3ff) << (30 - 8));
			resp[1] = ((response[0] & 0xfc00) >> 10);
			break;
		case SDIO_CMD_RSP_136:
			resp[3] = ((response[7] & 0x3fff) << 8)	|
				((response[6] & 0x3ff) << 22);
			resp[2] = ((response[6] & 0xfc00) >> 10)	|
				((response[5] & 0xffff) << 6)	|
				((response[4] & 0x3ff) << 22);
			resp[1] = ((response[4] & 0xfc00) >> 10)	|
				((response[3] & 0xffff) << 6)	|
				((response[2] & 0x3ff) << 22);
			resp[0] = ((response[2] & 0xfc00) >> 10)	|
				((response[1] & 0xffff) << 6)	|
				((response[0] & 0x3ff) << 22);
			break;
		default:
			return 0;
	}
#ifdef MMC_DEBUG
	int i;
	printf("MMC resp :");
	for (i=0; i<4; ++i ) {
		printf(" %08x", resp[i]);
	}
	printf("\n");
#endif
	if( err )
		return NULL ;
	else
		return resp;
}


int mmc_block_read(uchar *dst, ulong src, ulong len)
{
	ulong *resp;
	//ushort argh, argl;
	//ulong status;
	if (len == 0) {
		return 0;
	}
	if (is_sdhc) {
		/* SDHC: use block address */
		src >>= 9;
	}
	debug("mmc_block_rd dst %lx src %lx len %d\n", (ulong)dst, src, len);
#if 0
	/* set block len */
	resp = mmc_cmd(MMC_CMD_SET_BLOCKLEN, len, 0, SDIO_CMD_RSP_48, SDIO_NOR_CMD_DONE );
	if (!resp) {
		printf("mmc_block_read: set blk len fails\n");
	 	return -EIO;
	}
#endif
	// prepare for dma transfer 
	SDIO_REG_WRITE16(SDIO_SYS_ADDR_LOW,((ulong)(dst))&0xffff);
	SDIO_REG_WRITE16(SDIO_SYS_ADDR_HI,(((ulong)dst)>>16)&0xffff);
	SDIO_REG_WRITE16(SDIO_BLK_SIZE,len);
	SDIO_REG_WRITE16(SDIO_BLK_COUNT,1);
	
	/* send read command */
	resp = mmc_cmd(MMC_CMD_READ_BLOCK, src, 0x10 , // 0x12,
			SDIO_CMD_RSP_48, SDIO_NOR_XFER_DONE);
	if (!resp) {
		printf("mmc_block_read: mmc read block cmd fails\n");
		return -EIO;
	}
	return 0;
}

int mmc_block_write(ulong dst, uchar *src, int len)
{
	//uchar *resp;
	//ushort argh, argl;
	//ulong status;
	return -1 ;
#if 0
	if (len == 0) {
		return 0;
	}
	debug("mmc_block_wr dst %lx src %lx len %d\n", dst, (ulong)src, len);
	argh = len >> 16;
	argl = len & 0xffff;
	/* set block len */
	resp = mmc_cmd(MMC_CMD_SET_BLOCKLEN, argh, argl, MMC_CMDAT_R1);
	/* send write command */
	argh = dst >> 16;
	argl = dst & 0xffff;
	MMC_STRPCL = MMC_STRPCL_STOP_CLK;
	MMC_NOB = 1;
	MMC_BLKLEN = len;
	resp = mmc_cmd(MMC_CMD_WRITE_BLOCK, argh, argl,
			MMC_CMDAT_R1|MMC_CMDAT_WRITE|MMC_CMDAT_BLOCK|MMC_CMDAT_DATA_EN);
	MMC_I_MASK = ~MMC_I_MASK_TXFIFO_WR_REQ;
	while (len) {
		if (MMC_I_REG & MMC_I_REG_TXFIFO_WR_REQ) {
			int i, bytes = min(32,len);
			for (i=0; i<bytes; i++) {
				MMC_TXFIFO = *src++;
			}
			if (bytes < 32) {
				MMC_PRTBUF = MMC_PRTBUF_BUF_PART_FULL;
			}
			len -= bytes;
		}
		status = MMC_STAT;
		if (status & MMC_STAT_ERRORS) {
			printf("MMC_STAT error %lx\n", status);
			return -1;
		}
	}
	MMC_I_MASK = ~MMC_I_MASK_DATA_TRAN_DONE;
	while (!(MMC_I_REG & MMC_I_REG_DATA_TRAN_DONE));
	MMC_I_MASK = ~MMC_I_MASK_PRG_DONE;
	while (!(MMC_I_REG & MMC_I_REG_PRG_DONE));
	status = MMC_STAT;
	if (status & MMC_STAT_ERRORS) {
		printf("MMC_STAT error %lx\n", status);
		return -1;
	}
	return 0;
#endif
}

int mv_mmc_read(ulong src, uchar *dst, int size)
{
	ulong end, part_start, part_end, part_len, aligned_start, aligned_end;
	ulong mmc_block_size, mmc_block_address;
	if (size == 0) {
		return 0;
	}
	if (!mmc_ready) {
		printf("Please initial the MMC first\n");
		return -1;
	}
	mmc_block_size = MMC_BLOCK_SIZE;
	mmc_block_address = ~(mmc_block_size - 1);
	src -= CONFIG_SYS_MMC_BASE;
	end = src + size;
	part_start = ~mmc_block_address & src;
	part_end = ~mmc_block_address & end;
	aligned_start = mmc_block_address & src;
	aligned_end = mmc_block_address & end;
	/* all block aligned accesses */
	debug("src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
	src, (ulong)dst, end, part_start, part_end, aligned_start, aligned_end);
	if (part_start) {
		part_len = mmc_block_size - part_start;
		debug("ps src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
		src, (ulong)dst, end, part_start, part_end, aligned_start, aligned_end);
		if ((mmc_block_read(mmc_buf, aligned_start, mmc_block_size)) < 0) {
			return -1;
		}
		memcpy(dst, mmc_buf+part_start, part_len);
		dst += part_len;
		src += part_len;
	}
	debug("src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
	src, (ulong)dst, end, part_start, part_end, aligned_start, aligned_end);
	for (; src < aligned_end; aligned_start +=mmc_block_size, src += mmc_block_size, dst += mmc_block_size) {
		debug("al src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
		src, (ulong)dst, end, part_start, part_end, aligned_start, aligned_end);
		if ((mmc_block_read(mmc_buf, aligned_start, mmc_block_size)) < 0) {
		 	printf("mmc block read error\n");
			return -1;
		}
		//printf("mem copy from %x to %x, size %d\n", (ulong)mmc_buf, (ulong)dst, mmc_block_size );
		memcpy(dst, mmc_buf, mmc_block_size);
	}
	debug("src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
	src, (ulong)dst, end, part_start, part_end, aligned_start, aligned_end);
	if (part_end && src < end) {
		debug("pe src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
		src, (ulong)dst, end, part_start, part_end, aligned_start, aligned_end);
		if ((mmc_block_read(mmc_buf, aligned_end, mmc_block_size)) < 0) {
			return -1;
		}
		memcpy(dst, mmc_buf, part_end);
	}
	return 0;
}

int mmc_write(uchar *src, ulong dst, int size)
{
	ulong end, part_start, part_end, part_len, aligned_start, aligned_end;
	ulong mmc_block_size, mmc_block_address;
	if (size == 0) {
		return 0;
	}
	if (!mmc_ready) {
		printf("Please initial the MMC first\n");
		return -1;
	}
	mmc_block_size = MMC_BLOCK_SIZE;
	mmc_block_address = ~(mmc_block_size - 1);
	dst -= CONFIG_SYS_MMC_BASE;
	end = dst + size;
	part_start = ~mmc_block_address & dst;
	part_end = ~mmc_block_address & end;
	aligned_start = mmc_block_address & dst;
	aligned_end = mmc_block_address & end;
	/* all block aligned accesses */
	debug("src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
	src, (ulong)dst, end, part_start, part_end, aligned_start, aligned_end);
	if (part_start) {
		part_len = mmc_block_size - part_start;
		debug("ps src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
		(ulong)src, dst, end, part_start, part_end, aligned_start, aligned_end);
		if ((mmc_block_read(mmc_buf, aligned_start, mmc_block_size)) < 0) {
			return -1;
		}
		memcpy(mmc_buf+part_start, src, part_len);
		if ((mmc_block_write(aligned_start, mmc_buf, mmc_block_size)) < 0) {
			return -1;
		}
		dst += part_len;
		src += part_len;
	}
	debug("src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
	src, (ulong)dst, end, part_start, part_end, aligned_start, aligned_end);
	for (; dst < aligned_end; src += mmc_block_size, dst += mmc_block_size) {
		debug("al src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
		src, (ulong)dst, end, part_start, part_end, aligned_start, aligned_end);
		if ((mmc_block_write(dst, (uchar *)src, mmc_block_size)) < 0) {
			return -1;
		}
	}
	debug("src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
	src, (ulong)dst, end, part_start, part_end, aligned_start, aligned_end);
	if (part_end && dst < end) {
		debug("pe src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
		src, (ulong)dst, end, part_start, part_end, aligned_start, aligned_end);
		if ((mmc_block_read(mmc_buf, aligned_end, mmc_block_size)) < 0) {
			return -1;
		}
		memcpy(mmc_buf, src, part_end);
		if ((mmc_block_write(aligned_end, mmc_buf, mmc_block_size)) < 0) {
			return -1;
		}
	}
	return 0;
}


unsigned long mmc_bread(int dev_num, unsigned long blknr, lbaint_t blkcnt, void *dst)
{
	int mmc_block_size = MMC_BLOCK_SIZE;
	ulong src = blknr * mmc_block_size + CONFIG_SYS_MMC_BASE;
	mv_mmc_read(src, (uchar *)dst, blkcnt*mmc_block_size);
	return blkcnt;
}

//int mmc_init(int verbose)
int mmc_legacy_init(int verbose)
{
 	int retries, rc = -ENODEV;
	ulong *resp;
	int sd_ver20;
	int is_sd;
	ushort reg;
	uchar cidbuf[64];
	sd_ver20 = 0;
	is_sdhc = 0;
	is_sd = 0;
	// Initial Host Ctrl : Timeout : max , Normal Speed mode, 4-bit data mode
	// Big Endian, SD memory Card, Push_pull CMD Line 
	SDIO_REG_WRITE16(SDIO_HOST_CTRL, 
		SDIO_HOST_CTRL_TMOUT(0xf) | 
		SDIO_HOST_CTRL_DATA_WIDTH_4_BITS | 
		SDIO_HOST_CTRL_BIG_ENDIAN | 
		SDIO_HOST_CTRL_PUSH_PULL_EN | 
		SDIO_HOST_CTRL_CARD_TYPE_MEM_ONLY );
	SDIO_REG_WRITE16(SDIO_CLK_CTRL, 0);
	//enable status
	SDIO_REG_WRITE16(SDIO_NOR_STATUS_EN, 0xffff);
	SDIO_REG_WRITE16(SDIO_ERR_STATUS_EN, 0xffff);
	//disable interrupts
	SDIO_REG_WRITE16(SDIO_NOR_INTR_EN, 0);
	SDIO_REG_WRITE16(SDIO_ERR_INTR_EN, 0);
	SDIO_REG_WRITE16(SDIO_SW_RESET,0x100);
	udelay(10000);
	mmc_csd_s.c_size = 0;
	/* reset */
	retries = 10;
	//mmc_cmd(ulong cmd, ulong arg, ushort xfermode, ushort resptype, ushort waittype);
	resp = mmc_cmd(0, 0, 0, SDIO_CMD_RSP_NONE , SDIO_NOR_CMD_DONE );
	debug("cmd 0 resp : %08x %08x %08x %08x\n", resp[0], resp[1], resp[2], resp[3] ); 
	debug ("trying to detect SD card version\n");
	resp = mmc_cmd(8, 0x000001aa, 0,  SDIO_CMD_RSP_48, SDIO_NOR_CMD_DONE );
	debug("cmd 8 resp : %08x %08x %08x %08x\n", resp[0], resp[1], resp[2], resp[3] ); 
	if (resp && (resp[0] & 0x1ff)==0x1aa) {
		debug("sd version 2.0 card detected\n");
		sd_ver20 = 1;
	}
	if (sd_ver20)
		retries = 50;
	else
		retries = 10;
	while (retries--) {
		resp = mmc_cmd(55, 0, 0,  SDIO_CMD_RSP_48, SDIO_NOR_CMD_DONE );
		debug("cmd 55 resp : %08x %08x %08x %08x\n", resp[0], resp[1], resp[2], resp[3] ); 
		if (sd_ver20) 
			resp = mmc_cmd(41, 0x40300000, 0,  SDIO_CMD_RSP_48, SDIO_NOR_CMD_DONE );
		else
			resp = mmc_cmd(41, 0x00300000, 0,  SDIO_CMD_RSP_48, SDIO_NOR_CMD_DONE );
		debug("cmd 41 resp : %08x %08x %08x %08x\n", resp[0], resp[1], resp[2], resp[3] ); 
		if (resp && (resp[0] & 0x80000000)) {
			debug ("detected SD card\n");
			is_sd = 1;
			break;
		}
		udelay(100*1000);
	}
	if (retries <= 0 && !is_sd) {
		debug ("failed to detect SD card, trying MMC\n");
		retries = 10;
		while (retries--) {
			resp = mmc_cmd(1, 0, 0,  SDIO_CMD_RSP_48, SDIO_NOR_CMD_DONE );
			debug("cmd 01 resp : %08x %08x %08x %08x\n", resp[0], resp[1], resp[2], resp[3] ); 
			if (resp && (resp[0] & 0x80000000)) {
				debug ("detected MMC card\n");
				reg = SDIO_REG_READ16(SDIO_HOST_CTRL);
				reg &= ~(0x3<<1);
				reg |= SDIO_HOST_CTRL_CARD_TYPE_IO_MMC;
				SDIO_REG_WRITE16(SDIO_HOST_CTRL, reg);
				break;
			}
			udelay(100*1000);
		}
	}
		
	if (retries <= 0) {
		debug ("detect fails\n");
		return -ENODEV;
	}
	/* try to get card id */
	resp = mmc_cmd(2, 0, 0, SDIO_CMD_RSP_136, SDIO_NOR_CMD_DONE );
	debug("cmd 2 resp : %08x %08x %08x %08x\n", resp[0], resp[1], resp[2], resp[3] ); 
	if (resp == NULL) {
		debug ("read cid fails\n");
		return -ENODEV;
	}
	if (is_sd) {
/*		struct mmc_csd *cid = (struct mmc_csd *) resp;*/
		memcpy(cidbuf, resp, sizeof(struct mmc_csd));
/*		sprintf((char *) mmc_dev.vendor, 
			"Man %02x OEM %c%c \"%c%c%c%c%c\"",
			cid->mid, cid->oid_0, cid->oid_1,
			cid->pnm_0, cid->pnm_1, cid->pnm_2, cid->pnm_3, cid->pnm_4);
		sprintf((char *) mmc_dev.product, "%d", 
			(cid->psn_0 << 24) | (cid->psn_1 <<16) | (cid->psn_2 << 8) | (cid->psn_3 << 8));
		
		sprintf((char *) mmc_dev.revision, "%d.%d", cid->prv>>4, cid->prv & 0xff);
		*/
	} else {
		/* TODO configure mmc driver depending on card attributes */
/*		struct mmc_cid *cid = (struct mmc_cid *) resp;*/
		memcpy(cidbuf, resp, sizeof(struct mmc_csd));
/*
		sprintf((char *) mmc_dev.vendor, 
			"Man %02x%02x%02x Snr %02x%02x%02x",
			cid->id[0], cid->id[1], cid->id[2],
			cid->sn[0], cid->sn[1], cid->sn[2]);
		sprintf((char *) mmc_dev.product, "%s", cid->name);
		sprintf((char *) mmc_dev.revision, "%x %x", cid->hwrev, cid->fwrev);
*/
	}
		
	/* fill in device description */
	mmc_dev.if_type = IF_TYPE_MMC;
	mmc_dev.part_type = PART_TYPE_DOS;
	mmc_dev.dev = 0;
	mmc_dev.lun = 0;
	mmc_dev.type = 0;
	/* FIXME fill in the correct size (is set to 128MByte) */
	mmc_dev.blksz = 512;
	mmc_dev.lba = 0x10000;
	mmc_dev.removable = 0;
	mmc_dev.block_read = mmc_bread;
	/* MMC exists, get CSD too */
	resp = mmc_cmd(MMC_CMD_SET_RCA, 0, 0, SDIO_CMD_RSP_48, SDIO_NOR_CMD_DONE );
	if (resp == NULL) {
		debug ("set rca fails\n");
		return -ENODEV;
	}
	debug("cmd3 resp : 0x%08x 0x%08x 0x%08x 0x%08x\n", resp[0], resp[1], resp[2], resp[3]);
	if (is_sd)
		rca = resp[0] >> 16;
	else 
		rca = 0;
	resp = mmc_cmd(MMC_CMD_SEND_CSD, rca<<16, 0, SDIO_CMD_RSP_136,SDIO_NOR_CMD_DONE );
	debug("cmd 9 resp : %08x %08x %08x %08x\n", resp[0], resp[1], resp[2], resp[3] ); 
	if (resp == NULL) {
		debug ("read csd fails\n");
		return -ENODEV;
	}
	memcpy(&mmc_csd_s, (struct mmc_csd *) resp, sizeof(struct mmc_csd));
	rc = 0;
	mmc_ready = 1;
	/* FIXME add verbose printout for csd */
	debug ("size = %u\n", mmc_size(&mmc_csd_s));
	resp = mmc_cmd(7, rca<<16, 0, SDIO_CMD_RSP_48BUSY, SDIO_NOR_CMD_DONE);
	if (resp == NULL) {
		debug ("select card fails\n");
		return -ENODEV;
	}
	debug("cmd 7 resp : %08x %08x %08x %08x\n", resp[0], resp[1], resp[2], resp[3] ); 
	if (is_sd) {
		resp = mmc_cmd(55, rca<<16, 0,  SDIO_CMD_RSP_48, SDIO_NOR_CMD_DONE );
		if (resp == NULL) {
			debug ("cmd55 fails\n");
			return -ENODEV;
		}
		debug("cmd55 resp : 0x%08x 0x%08x 0x%08x 0x%08x\n", resp[0], resp[1], resp[2], resp[3]);
		resp = mmc_cmd(6, (rca<<16) | 0x2 , 0, SDIO_CMD_RSP_48, SDIO_NOR_CMD_DONE );
		if (resp == NULL) {
			debug ("cmd55 fails\n");
			return -ENODEV;
		}
		debug("cmd6 resp : 0x%08x 0x%08x 0x%08x 0x%08x\n", resp[0], resp[1], resp[2], resp[3]);
	}
	resp = (ulong *) &mmc_csd_s;
	debug("csd: 0x%08x 0x%08x 0x%08x 0x%08x\n", resp[0], resp[1], resp[2], resp[3]);
	/* check SDHC */
	if ((resp[0]&0xf0000000)==0x40000000)
		is_sdhc = 1;
	/* set block len */
	resp = mmc_cmd(MMC_CMD_SET_BLOCKLEN, 512, 0, SDIO_CMD_RSP_48, SDIO_NOR_CMD_DONE );
	if (!resp) {
		printf("mmc_block_read: set blk len fails\n");
	 	return -EIO;
	}
/*	if (verbose) {
		if (is_sd) 
			print_sd_cid((struct mmc_csd *) cidbuf);
		else 
			print_mmc_cid((struct mmc_cid *) cidbuf);
	}*/
	mvsdmmc_set_clock(25000000);
	fat_register_device(&mmc_dev,1); /* partitions start counting with 1 */
	return rc;
}
#if 0
int
mmc_ident(block_dev_desc_t *dev)
{
	return 0;
}

int
mmc2info(ulong addr)
{
	/* FIXME hard codes to 256 MB device */
	if (addr >= CONFIG_SYS_MMC_BASE && addr < CONFIG_SYS_MMC_BASE + 0xffffffff) {
		return 1;
	}
	return 0;
}
#endif
#endif	/* CONFIG_MMC */