Blackfin: add driver for on-chip MMC/SD controller

This is a port of the Linux Blackfin on-chip SDH driver to U-Boot.

Signed-off-by: Cliff Cai <cliff.cai@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

3 files changed, 606 insertions, 0 deletions

diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index bb0d52e8f0..d496364a24 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -26,6 +26,7 @@ include $(TOPDIR)/config.mk
 LIB	:= $(obj)libmmc.a
 
 COBJS-$(CONFIG_ATMEL_MCI) += atmel_mci.o
+COBJS-$(CONFIG_BFIN_SDH) += bfin_sdh.o
 COBJS-$(CONFIG_OMAP3_MMC) += omap3_mmc.o
 
 COBJS	:= $(COBJS-y)
diff --git a/drivers/mmc/bfin_sdh.c b/drivers/mmc/bfin_sdh.c
new file mode 100644
index 0000000000..7d6b495f3b
--- /dev/null
+++ b/drivers/mmc/bfin_sdh.c
@@ -0,0 +1,546 @@
+/*
+ * Driver for Blackfin on-chip SDH controller
+ *
+ * Copyright (c) 2008 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <part.h>
+#include <mmc.h>
+
+#include <asm/io.h>
+#include <asm/errno.h>
+#include <asm/byteorder.h>
+#include <asm/blackfin.h>
+#include <asm/mach-common/bits/sdh.h>
+#include <asm/mach-common/bits/dma.h>
+
+#include "bfin_sdh.h"
+
+/* SD_CLK frequency must be less than 400k in identification mode */
+#ifndef CONFIG_SYS_MMC_CLK_ID
+#define CONFIG_SYS_MMC_CLK_ID		200000
+#endif
+/* SD_CLK for normal working */
+#ifndef CONFIG_SYS_MMC_CLK_OP
+#define CONFIG_SYS_MMC_CLK_OP		25000000
+#endif
+/* support 3.2-3.3V and 3.3-3.4V */
+#define CONFIG_SYS_MMC_OP_COND		0x00300000
+#define MMC_DEFAULT_RCA		1
+
+#if defined(__ADSPBF51x__)
+# define bfin_read_SDH_PWR_CTL		bfin_read_RSI_PWR_CONTROL
+# define bfin_write_SDH_PWR_CTL		bfin_write_RSI_PWR_CONTROL
+# define bfin_read_SDH_CLK_CTL		bfin_read_RSI_CLK_CONTROL
+# define bfin_write_SDH_CLK_CTL		bfin_write_RSI_CLK_CONTROL
+# define bfin_write_SDH_ARGUMENT	bfin_write_RSI_ARGUMENT
+# define bfin_write_SDH_COMMAND		bfin_write_RSI_COMMAND
+# define bfin_read_SDH_RESPONSE0	bfin_read_RSI_RESPONSE0
+# define bfin_read_SDH_RESPONSE1	bfin_read_RSI_RESPONSE1
+# define bfin_read_SDH_RESPONSE2	bfin_read_RSI_RESPONSE2
+# define bfin_read_SDH_RESPONSE3	bfin_read_RSI_RESPONSE3
+# define bfin_write_SDH_DATA_TIMER	bfin_write_RSI_DATA_TIMER
+# define bfin_write_SDH_DATA_LGTH	bfin_write_RSI_DATA_LGTH
+# define bfin_read_SDH_DATA_CTL		bfin_read_RSI_DATA_CONTROL
+# define bfin_write_SDH_DATA_CTL	bfin_write_RSI_DATA_CONTROL
+# define bfin_read_SDH_STATUS		bfin_read_RSI_STATUS
+# define bfin_write_SDH_STATUS_CLR 	bfin_write_RSI_STATUSCL
+# define bfin_read_SDH_CFG		bfin_read_RSI_CONFIG
+# define bfin_write_SDH_CFG		bfin_write_RSI_CONFIG
+# define bfin_write_DMA_START_ADDR	bfin_write_DMA4_START_ADDR
+# define bfin_write_DMA_X_COUNT		bfin_write_DMA4_X_COUNT
+# define bfin_write_DMA_X_MODIFY	bfin_write_DMA4_X_MODIFY
+# define bfin_write_DMA_CONFIG		bfin_write_DMA4_CONFIG
+#elif defined(__ADSPBF54x__)
+# define bfin_write_DMA_START_ADDR	bfin_write_DMA22_START_ADDR
+# define bfin_write_DMA_X_COUNT		bfin_write_DMA22_X_COUNT
+# define bfin_write_DMA_X_MODIFY	bfin_write_DMA22_X_MODIFY
+# define bfin_write_DMA_CONFIG		bfin_write_DMA22_CONFIG
+#else
+# error no support for this proc yet
+#endif
+
+static unsigned int mmc_rca;
+static int mmc_card_is_sd;
+static block_dev_desc_t mmc_blkdev;
+struct mmc_cid cid;
+static __u32 csd[4];
+
+#define get_bits(resp, start, size)					\
+	({								\
+		const int __size = size;				\
+		const uint32_t __mask = (__size < 32 ? 1 << __size : 0) - 1;	\
+		const int32_t __off = 3 - ((start) / 32);			\
+		const int32_t __shft = (start) & 31;			\
+		uint32_t __res;						\
+									\
+		__res = resp[__off] >> __shft;				\
+		if (__size + __shft > 32)				\
+			__res |= resp[__off-1] << ((32 - __shft) % 32);	\
+		__res & __mask;						\
+	})
+
+
+block_dev_desc_t *mmc_get_dev(int dev)
+{
+	return &mmc_blkdev;
+}
+
+static void mci_set_clk(unsigned long clk)
+{
+	unsigned long sys_clk;
+	unsigned long clk_div;
+	__u16 clk_ctl = 0;
+
+	/* setting SD_CLK */
+	sys_clk = get_sclk();
+	bfin_write_SDH_CLK_CTL(0);
+	if (sys_clk % (2 * clk) == 0)
+		clk_div = sys_clk / (2 * clk) - 1;
+	else
+		clk_div = sys_clk / (2 * clk);
+
+	if (clk_div > 0xff)
+		clk_div = 0xff;
+	clk_ctl |= (clk_div & 0xff);
+	clk_ctl |= CLK_E;
+	bfin_write_SDH_CLK_CTL(clk_ctl);
+}
+
+static int
+mmc_cmd(unsigned long cmd, unsigned long arg, void *resp, unsigned long flags)
+{
+	unsigned int sdh_cmd;
+	unsigned int status;
+	int ret = 0;
+	sdh_cmd = 0;
+	unsigned long *response = resp;
+	sdh_cmd |= cmd;
+
+	if (flags & MMC_RSP_PRESENT)
+		sdh_cmd |= CMD_RSP;
+
+	if (flags & MMC_RSP_136)
+		sdh_cmd |= CMD_L_RSP;
+
+	bfin_write_SDH_ARGUMENT(arg);
+	bfin_write_SDH_COMMAND(sdh_cmd | CMD_E);
+
+	/* wait for a while */
+	do {
+		udelay(1);
+		status = bfin_read_SDH_STATUS();
+	} while (!(status & (CMD_SENT | CMD_RESP_END | CMD_TIME_OUT |
+		CMD_CRC_FAIL)));
+
+	if (flags & MMC_RSP_PRESENT) {
+		response[0] = bfin_read_SDH_RESPONSE0();
+		if (flags & MMC_RSP_136) {
+			response[1] = bfin_read_SDH_RESPONSE1();
+			response[2] = bfin_read_SDH_RESPONSE2();
+			response[3] = bfin_read_SDH_RESPONSE3();
+		}
+	}
+
+	if (status & CMD_TIME_OUT) {
+		printf("CMD%d timeout\n", (int)cmd);
+		ret |= -ETIMEDOUT;
+	} else if (status & CMD_CRC_FAIL && flags & MMC_RSP_CRC) {
+		printf("CMD%d CRC failure\n", (int)cmd);
+		ret |= -EILSEQ;
+	}
+	bfin_write_SDH_STATUS_CLR(CMD_SENT_STAT | CMD_RESP_END_STAT |
+				CMD_TIMEOUT_STAT | CMD_CRC_FAIL_STAT);
+	return ret;
+}
+
+static int
+mmc_acmd(unsigned long cmd, unsigned long arg, void *resp, unsigned long flags)
+{
+	unsigned long aresp[4];
+	int ret = 0;
+
+	ret = mmc_cmd(MMC_CMD_APP_CMD, 0, aresp,
+		      MMC_RSP_PRESENT);
+	if (ret)
+		return ret;
+
+	if ((aresp[0] & (ILLEGAL_COMMAND | APP_CMD)) != APP_CMD)
+		return -ENODEV;
+	ret = mmc_cmd(cmd, arg, resp, flags);
+	return ret;
+}
+
+static unsigned long
+mmc_bread(int dev, unsigned long start, lbaint_t blkcnt, void *buffer)
+{
+	int ret, i;
+	unsigned long resp[4];
+	unsigned long card_status;
+	__u8 *buf = buffer;
+	__u32 status;
+	__u16 data_ctl = 0;
+	__u16 dma_cfg = 0;
+
+	if (blkcnt == 0)
+		return 0;
+	debug("mmc_bread: dev %d, start %d, blkcnt %d\n", dev, start, blkcnt);
+	/* Force to use 512-byte block,because a lot of code depends on this */
+	data_ctl |= 9 << 4;
+	data_ctl |= DTX_DIR;
+	bfin_write_SDH_DATA_CTL(data_ctl);
+	dma_cfg |= WDSIZE_32 | RESTART | WNR | DMAEN;
+
+	/* FIXME later */
+	bfin_write_SDH_DATA_TIMER(0xFFFFFFFF);
+	for (i = 0; i < blkcnt; ++i, ++start) {
+		blackfin_dcache_flush_invalidate_range(buf + i * mmc_blkdev.blksz,
+			buf + (i + 1) * mmc_blkdev.blksz);
+		bfin_write_DMA_START_ADDR(buf + i * mmc_blkdev.blksz);
+		bfin_write_DMA_X_COUNT(mmc_blkdev.blksz / 4);
+		bfin_write_DMA_X_MODIFY(4);
+		bfin_write_DMA_CONFIG(dma_cfg);
+		bfin_write_SDH_DATA_LGTH(mmc_blkdev.blksz);
+		/* Put the device into Transfer state */
+		ret = mmc_cmd(MMC_CMD_SELECT_CARD, mmc_rca << 16, resp, MMC_RSP_R1);
+		if (ret) {
+			printf("MMC_CMD_SELECT_CARD failed\n");
+			goto out;
+		}
+		/* Set block length */
+		ret = mmc_cmd(MMC_CMD_SET_BLOCKLEN, mmc_blkdev.blksz, resp, MMC_RSP_R1);
+		if (ret) {
+			printf("MMC_CMD_SET_BLOCKLEN failed\n");
+			goto out;
+		}
+		ret = mmc_cmd(MMC_CMD_READ_SINGLE_BLOCK,
+			      start * mmc_blkdev.blksz, resp,
+			      MMC_RSP_R1);
+		if (ret) {
+			printf("MMC_CMD_READ_SINGLE_BLOCK failed\n");
+			goto out;
+		}
+		bfin_write_SDH_DATA_CTL(bfin_read_SDH_DATA_CTL() | DTX_DMA_E | DTX_E);
+
+		do {
+			udelay(1);
+			status = bfin_read_SDH_STATUS();
+		} while (!(status & (DAT_BLK_END | DAT_END | DAT_TIME_OUT | DAT_CRC_FAIL | RX_OVERRUN)));
+
+		if (status & (DAT_TIME_OUT | DAT_CRC_FAIL | RX_OVERRUN)) {
+			bfin_write_SDH_STATUS_CLR(DAT_TIMEOUT_STAT | \
+				DAT_CRC_FAIL_STAT | RX_OVERRUN_STAT);
+			goto read_error;
+		} else {
+			bfin_write_SDH_STATUS_CLR(DAT_BLK_END_STAT | DAT_END_STAT);
+			mmc_cmd(MMC_CMD_SELECT_CARD, 0, resp, 0);
+		}
+	}
+ out:
+
+	return i;
+
+ read_error:
+	mmc_cmd(MMC_CMD_SEND_STATUS, mmc_rca << 16, &card_status, MMC_RSP_R1);
+	printf("mmc: bread failed, status = %08x, card status = %08lx\n",
+	       status, card_status);
+	goto out;
+}
+
+static unsigned long
+mmc_bwrite(int dev, unsigned long start, lbaint_t blkcnt, const void *buffer)
+{
+	int ret, i = 0;
+	unsigned long resp[4];
+	unsigned long card_status;
+	const __u8 *buf = buffer;
+	__u32 status;
+	__u16 data_ctl = 0;
+	__u16 dma_cfg = 0;
+
+	if (blkcnt == 0)
+		return 0;
+
+	debug("mmc_bwrite: dev %d, start %lx, blkcnt %lx\n",
+		 dev, start, blkcnt);
+	/* Force to use 512-byte block,because a lot of code depends on this */
+	data_ctl |= 9 << 4;
+	data_ctl &= ~DTX_DIR;
+	bfin_write_SDH_DATA_CTL(data_ctl);
+	dma_cfg |= WDSIZE_32 | RESTART | DMAEN;
+	/* FIXME later */
+	bfin_write_SDH_DATA_TIMER(0xFFFFFFFF);
+	for (i = 0; i < blkcnt; ++i, ++start) {
+		bfin_write_DMA_START_ADDR(buf + i * mmc_blkdev.blksz);
+		bfin_write_DMA_X_COUNT(mmc_blkdev.blksz / 4);
+		bfin_write_DMA_X_MODIFY(4);
+		bfin_write_DMA_CONFIG(dma_cfg);
+		bfin_write_SDH_DATA_LGTH(mmc_blkdev.blksz);
+
+		/* Put the device into Transfer state */
+		ret = mmc_cmd(MMC_CMD_SELECT_CARD, mmc_rca << 16, resp, MMC_RSP_R1);
+		if (ret) {
+			printf("MMC_CMD_SELECT_CARD failed\n");
+			goto out;
+		}
+		/* Set block length */
+		ret = mmc_cmd(MMC_CMD_SET_BLOCKLEN, mmc_blkdev.blksz, resp, MMC_RSP_R1);
+		if (ret) {
+			printf("MMC_CMD_SET_BLOCKLEN failed\n");
+			goto out;
+		}
+		ret = mmc_cmd(MMC_CMD_WRITE_BLOCK,
+			      start * mmc_blkdev.blksz, resp,
+			      MMC_RSP_R1);
+		if (ret) {
+			printf("MMC_CMD_WRITE_SINGLE_BLOCK failed\n");
+			goto out;
+		}
+		bfin_write_SDH_DATA_CTL(bfin_read_SDH_DATA_CTL() | DTX_DMA_E | DTX_E);
+
+		do {
+			udelay(1);
+			status = bfin_read_SDH_STATUS();
+		} while (!(status & (DAT_BLK_END | DAT_END | DAT_TIME_OUT | DAT_CRC_FAIL | TX_UNDERRUN)));
+
+		if (status & (DAT_TIME_OUT | DAT_CRC_FAIL | TX_UNDERRUN)) {
+			bfin_write_SDH_STATUS_CLR(DAT_TIMEOUT_STAT |
+				DAT_CRC_FAIL_STAT | TX_UNDERRUN_STAT);
+			goto write_error;
+		} else {
+			bfin_write_SDH_STATUS_CLR(DAT_BLK_END_STAT | DAT_END_STAT);
+			mmc_cmd(MMC_CMD_SELECT_CARD, 0, resp, 0);
+		}
+	}
+ out:
+	return i;
+
+ write_error:
+	mmc_cmd(MMC_CMD_SEND_STATUS, mmc_rca << 16, &card_status, MMC_RSP_R1);
+	printf("mmc: bwrite failed, status = %08x, card status = %08lx\n",
+	       status, card_status);
+	goto out;
+}
+
+static void mmc_parse_cid(struct mmc_cid *cid, unsigned long *resp)
+{
+	cid->mid = resp[0] >> 24;
+	cid->oid = (resp[0] >> 8) & 0xffff;
+	cid->pnm[0] = resp[0];
+	cid->pnm[1] = resp[1] >> 24;
+	cid->pnm[2] = resp[1] >> 16;
+	cid->pnm[3] = resp[1] >> 8;
+	cid->pnm[4] = resp[1];
+	cid->pnm[5] = resp[2] >> 24;
+	cid->pnm[6] = 0;
+	cid->prv = resp[2] >> 16;
+	cid->psn = (resp[2] << 16) | (resp[3] >> 16);
+	cid->mdt = resp[3] >> 8;
+}
+
+static void sd_parse_cid(struct mmc_cid *cid, unsigned long *resp)
+{
+	cid->mid = resp[0] >> 24;
+	cid->oid = (resp[0] >> 8) & 0xffff;
+	cid->pnm[0] = resp[0];
+	cid->pnm[1] = resp[1] >> 24;
+	cid->pnm[2] = resp[1] >> 16;
+	cid->pnm[3] = resp[1] >> 8;
+	cid->pnm[4] = resp[1];
+	cid->pnm[5] = 0;
+	cid->pnm[6] = 0;
+	cid->prv = resp[2] >> 24;
+	cid->psn = (resp[2] << 8) | (resp[3] >> 24);
+	cid->mdt = (resp[3] >> 8) & 0x0fff;
+}
+
+static void mmc_dump_cid(const struct mmc_cid *cid)
+{
+	printf("CID information:\n");
+	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(__u32 *csd)
+{
+	printf("CSD information:\n");
+	printf("CSD structure version:   1.%u\n", get_bits(csd, 126, 2));
+	printf("Card command classes:    %03x\n", get_bits(csd, 84, 12));
+	printf("Max trans speed: %s\n", (get_bits(csd, 96, 8) == 0x32) ? "25MHz" : "50MHz");
+	printf("Read block length:       %d\n", 1 << get_bits(csd, 80, 4));
+	printf("Write block length:      %u\n", 1 << get_bits(csd, 22, 4));
+	printf("Card capacity:		%u bytes\n",
+	       (get_bits(csd, 62, 12) + 1) * (1 << (get_bits(csd, 47, 3) + 2)) *
+	       (1 << get_bits(csd, 80, 4)));
+	putc('\n');
+}
+
+static int mmc_idle_cards(void)
+{
+	int ret = 0;
+
+	/* Reset all cards */
+	ret = mmc_cmd(MMC_CMD_GO_IDLE_STATE, 0, NULL, 0);
+	if (ret)
+		return ret;
+	udelay(500);
+	return mmc_cmd(MMC_CMD_GO_IDLE_STATE, 0, NULL, 0);
+}
+
+static int sd_init_card(struct mmc_cid *cid, int verbose)
+{
+	unsigned long resp[4];
+	int i, ret = 0;
+
+	mmc_idle_cards();
+	for (i = 0; i < 1000; ++i) {
+		ret = mmc_acmd(SD_CMD_APP_SEND_OP_COND, CONFIG_SYS_MMC_OP_COND,
+			       resp, MMC_RSP_R3);
+		if (ret || (resp[0] & 0x80000000))
+			break;
+		ret = -ETIMEDOUT;
+	}
+	if (ret)
+		return ret;
+
+	ret = mmc_cmd(MMC_CMD_ALL_SEND_CID, 0, resp, MMC_RSP_R2);
+	if (ret)
+		return ret;
+	sd_parse_cid(cid, resp);
+	if (verbose)
+		mmc_dump_cid(cid);
+
+	/* Get RCA of the card that responded */
+	ret = mmc_cmd(SD_CMD_SEND_RELATIVE_ADDR, 0, resp, MMC_RSP_R6);
+	if (ret)
+		return ret;
+
+	mmc_rca = (resp[0] >> 16) & 0xffff;
+	if (verbose)
+		printf("SD Card detected (RCA %u)\n", mmc_rca);
+	mmc_card_is_sd = 1;
+	return 0;
+}
+
+static int mmc_init_card(struct mmc_cid *cid, int verbose)
+{
+	unsigned long resp[4];
+	int i, ret = 0;
+
+	mmc_idle_cards();
+	for (i = 0; i < 1000; ++i) {
+		ret = mmc_cmd(MMC_CMD_SEND_OP_COND, CONFIG_SYS_MMC_OP_COND, resp,
+			      MMC_RSP_R3);
+		if (ret || (resp[0] & 0x80000000))
+			break;
+		ret = -ETIMEDOUT;
+	}
+	if (ret)
+		return ret;
+
+	/* Get CID of all cards. FIXME: Support more than one card */
+	ret = mmc_cmd(MMC_CMD_ALL_SEND_CID, 0, resp, MMC_RSP_R2);
+	if (ret)
+		return ret;
+	mmc_parse_cid(cid, resp);
+	if (verbose)
+		mmc_dump_cid(cid);
+
+	/* Set Relative Address of the card that responded */
+	ret = mmc_cmd(MMC_CMD_SET_RELATIVE_ADDR, mmc_rca << 16, resp,
+		      MMC_RSP_R1);
+	return ret;
+}
+
+int mmc_init(int verbose)
+{
+	__u16 pwr_ctl = 0;
+	int ret;
+	unsigned int max_blksz;
+	/* Initialize sdh controller */
+#if defined(__ADSPBF54x__)
+	bfin_write_DMAC1_PERIMUX(bfin_read_DMAC1_PERIMUX() | 0x1);
+	bfin_write_PORTC_FER(bfin_read_PORTC_FER() | 0x3F00);
+	bfin_write_PORTC_MUX(bfin_read_PORTC_MUX() & ~0xFFF0000);
+#elif defined(__ADSPBF51x__)
+	bfin_write_PORTG_FER(bfin_read_PORTG_FER() | 0x01F8);
+	bfin_write_PORTG_MUX((bfin_read_PORTG_MUX() & ~0x3FC) | 0x154);
+#else
+# error no portmux for this proc yet
+#endif
+	bfin_write_SDH_CFG(bfin_read_SDH_CFG() | CLKS_EN);
+	/* Disable card detect pin */
+	bfin_write_SDH_CFG((bfin_read_SDH_CFG() & 0x1F) | 0x60);
+	mci_set_clk(CONFIG_SYS_MMC_CLK_ID);
+	/* setting power control */
+	pwr_ctl |= ROD_CTL;
+	pwr_ctl |= PWR_ON;
+	bfin_write_SDH_PWR_CTL(pwr_ctl);
+	mmc_card_is_sd = 0;
+	ret = sd_init_card(&cid, verbose);
+	if (ret) {
+		mmc_rca = MMC_DEFAULT_RCA;
+		ret = mmc_init_card(&cid, verbose);
+	}
+	if (ret)
+		return ret;
+	/* Get CSD from the card */
+	ret = mmc_cmd(MMC_CMD_SEND_CSD, mmc_rca << 16, csd, MMC_RSP_R2);
+	if (ret)
+		return ret;
+	if (verbose)
+		mmc_dump_csd(csd);
+	/* Initialize the blockdev structure */
+	mmc_blkdev.if_type = IF_TYPE_MMC;
+	mmc_blkdev.part_type = PART_TYPE_DOS;
+	mmc_blkdev.block_read = mmc_bread;
+	mmc_blkdev.block_write = mmc_bwrite;
+	sprintf(mmc_blkdev.vendor,
+		"Man %02x%04x Snr %08lx",
+		cid.mid, cid.oid, cid.psn);
+	strncpy(mmc_blkdev.product, cid.pnm,
+		sizeof(mmc_blkdev.product));
+	sprintf(mmc_blkdev.revision, "%x %x",
+		cid.prv >> 4, cid.prv & 0x0f);
+
+	max_blksz = 1 << get_bits(csd, 80, 4);
+	/*
+	 * If we can't use 512 byte blocks, refuse to deal with the
+	 * card. Tons of code elsewhere seems to depend on this.
+	 */
+	if (max_blksz < 512 || (max_blksz > 512 && !get_bits(csd, 79, 1))) {
+		printf("Card does not support 512 byte reads, aborting.\n");
+		return -ENODEV;
+	}
+
+	mmc_blkdev.blksz = 512;
+	mmc_blkdev.lba = (get_bits(csd, 62, 12) + 1) * (1 << (get_bits(csd, 47, 3) + 2));
+	mci_set_clk(CONFIG_SYS_MMC_CLK_OP);
+	init_part(&mmc_blkdev);
+	return 0;
+}
+
+int mmc_read(ulong src, uchar *dst, int size)
+{
+	return -ENOSYS;
+}
+
+int mmc_write(uchar *src, ulong dst, int size)
+{
+	return -ENOSYS;
+}
+
+int mmc2info(ulong addr)
+{
+	return 0;
+}
diff --git a/drivers/mmc/bfin_sdh.h b/drivers/mmc/bfin_sdh.h
new file mode 100644
index 0000000000..793ec3061b
--- /dev/null
+++ b/drivers/mmc/bfin_sdh.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2008 Analog Device Inc.
+ *
+ * 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
+ */
+#ifndef __BLACKFIN_SDH_H__
+#define __BLACKFIN_SDH_H__
+
+#define MMC_RSP_PRESENT	(1 << 0)
+#define MMC_RSP_136	(1 << 1)		/* 136 bit response */
+#define MMC_RSP_CRC	(1 << 2)		/* expect valid crc */
+#define MMC_RSP_BUSY	(1 << 3)		/* card may send busy */
+#define MMC_RSP_OPCODE	(1 << 4)		/* response contains opcode */
+
+#define MMC_CMD_MASK	(3 << 5)		/* non-SPI command type */
+#define MMC_CMD_AC	(0 << 5)
+#define MMC_CMD_ADTC	(1 << 5)
+#define MMC_CMD_BC	(2 << 5)
+#define MMC_CMD_BCR	(3 << 5)
+
+#define MMC_RSP_SPI_S1	(1 << 7)		/* one status byte */
+#define MMC_RSP_SPI_S2	(1 << 8)		/* second byte */
+#define MMC_RSP_SPI_B4	(1 << 9)		/* four data bytes */
+#define MMC_RSP_SPI_BUSY (1 << 10)		/* card may send busy */
+
+/*
+ * These are the native response types, and correspond to valid bit
+ * patterns of the above flags.  One additional valid pattern
+ * is all zeros, which means we don't expect a response.
+ */
+#define MMC_RSP_NONE	(0)
+#define MMC_RSP_R1	(MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
+#define MMC_RSP_R1B	(MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE|MMC_RSP_BUSY)
+#define MMC_RSP_R2	(MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC)
+#define MMC_RSP_R3	(MMC_RSP_PRESENT)
+#define MMC_RSP_R4	(MMC_RSP_PRESENT)
+#define MMC_RSP_R5	(MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
+#define MMC_RSP_R6	(MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
+#define MMC_RSP_R7	(MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
+#define ILLEGAL_COMMAND  (1 << 22)
+#define APP_CMD		 (1 << 5)
+
+#endif