Add MMC Framework

Here's a new framework (based roughly off the linux one) for managing
MMC controllers.  It handles all of the standard SD/MMC transactions,
leaving the host drivers to implement only what is necessary to
deal with their specific hardware.

This also hooks the infrastructure into the PowerPC board code
(similar to how the ethernet infrastructure now hooks in)

Some of this code was contributed by Dave Liu <daveliu@freescale.com>

Signed-off-by: Andy Fleming <afleming@freescale.com>

2 files changed, 931 insertions, 0 deletions

diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index d496364..35aef31 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -25,6 +25,7 @@ include $(TOPDIR)/config.mk
 
 LIB	:= $(obj)libmmc.a
 
+COBJS-$(CONFIG_GENERIC_MMC) += mmc.o
 COBJS-$(CONFIG_ATMEL_MCI) += atmel_mci.o
 COBJS-$(CONFIG_BFIN_SDH) += bfin_sdh.o
 COBJS-$(CONFIG_OMAP3_MMC) += omap3_mmc.o
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
new file mode 100644
index 0000000..96186d9
--- /dev/null
+++ b/drivers/mmc/mmc.c
@@ -0,0 +1,930 @@
+/*
+ * Copyright 2008, Freescale Semiconductor, Inc
+ * Andy Fleming
+ *
+ * Based vaguely on the Linux code
+ *
+ * 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 <config.h>
+#include <common.h>
+#include <command.h>
+#include <mmc.h>
+#include <part.h>
+#include <malloc.h>
+#include <linux/list.h>
+#include <mmc.h>
+
+static struct list_head mmc_devices;
+static int cur_dev_num = -1;
+
+int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
+{
+	return mmc->send_cmd(mmc, cmd, data);
+}
+
+int mmc_set_blocklen(struct mmc *mmc, int len)
+{
+	struct mmc_cmd cmd;
+
+	cmd.cmdidx = MMC_CMD_SET_BLOCKLEN;
+	cmd.resp_type = MMC_RSP_R1;
+	cmd.cmdarg = len;
+	cmd.flags = 0;
+
+	return mmc_send_cmd(mmc, &cmd, NULL);
+}
+
+struct mmc *find_mmc_device(int dev_num)
+{
+	struct mmc *m;
+	struct list_head *entry;
+
+	list_for_each(entry, &mmc_devices) {
+		m = list_entry(entry, struct mmc, link);
+
+		if (m->block_dev.dev == dev_num)
+			return m;
+	}
+
+	printf("MMC Device %d not found\n", dev_num);
+
+	return NULL;
+}
+
+static ulong
+mmc_bwrite(int dev_num, ulong start, lbaint_t blkcnt, const void*src)
+{
+	struct mmc_cmd cmd;
+	struct mmc_data data;
+	int err;
+	int stoperr = 0;
+	struct mmc *mmc = find_mmc_device(dev_num);
+	int blklen;
+
+	if (!mmc)
+		return -1;
+
+	blklen = mmc->write_bl_len;
+
+	err = mmc_set_blocklen(mmc, mmc->write_bl_len);
+
+	if (err) {
+		printf("set write bl len failed\n\r");
+		return err;
+	}
+
+	if (blkcnt > 1)
+		cmd.cmdidx = MMC_CMD_WRITE_MULTIPLE_BLOCK;
+	else
+		cmd.cmdidx = MMC_CMD_WRITE_SINGLE_BLOCK;
+
+	if (mmc->high_capacity)
+		cmd.cmdarg = start;
+	else
+		cmd.cmdarg = start * blklen;
+
+	cmd.resp_type = MMC_RSP_R1;
+	cmd.flags = 0;
+
+	data.src = src;
+	data.blocks = blkcnt;
+	data.blocksize = blklen;
+	data.flags = MMC_DATA_WRITE;
+
+	err = mmc_send_cmd(mmc, &cmd, &data);
+
+	if (err) {
+		printf("mmc write failed\n\r");
+		return err;
+	}
+
+	if (blkcnt > 1) {
+		cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION;
+		cmd.cmdarg = 0;
+		cmd.resp_type = MMC_RSP_R1b;
+		cmd.flags = 0;
+		stoperr = mmc_send_cmd(mmc, &cmd, NULL);
+	}
+
+	return blkcnt;
+}
+
+int mmc_read_block(struct mmc *mmc, void *dst, uint blocknum)
+{
+	struct mmc_cmd cmd;
+	struct mmc_data data;
+
+	cmd.cmdidx = MMC_CMD_READ_SINGLE_BLOCK;
+
+	if (mmc->high_capacity)
+		cmd.cmdarg = blocknum;
+	else
+		cmd.cmdarg = blocknum * mmc->read_bl_len;
+
+	cmd.resp_type = MMC_RSP_R1;
+	cmd.flags = 0;
+
+	data.dest = dst;
+	data.blocks = 1;
+	data.blocksize = mmc->read_bl_len;
+	data.flags = MMC_DATA_READ;
+
+	return mmc_send_cmd(mmc, &cmd, &data);
+}
+
+int mmc_read(struct mmc *mmc, u64 src, uchar *dst, int size)
+{
+	char *buffer;
+	int i;
+	int blklen = mmc->read_bl_len;
+	int startblock = src / blklen;
+	int endblock = (src + size - 1) / blklen;
+	int err = 0;
+
+	/* Make a buffer big enough to hold all the blocks we might read */
+	buffer = malloc(blklen);
+
+	if (!buffer) {
+		printf("Could not allocate buffer for MMC read!\n");
+		return -1;
+	}
+
+	/* We always do full block reads from the card */
+	err = mmc_set_blocklen(mmc, mmc->read_bl_len);
+
+	if (err)
+		return err;
+
+	for (i = startblock; i <= endblock; i++) {
+		int segment_size;
+		int offset;
+
+		err = mmc_read_block(mmc, buffer, i);
+
+		if (err)
+			goto free_buffer;
+
+		/*
+		 * The first block may not be aligned, so we
+		 * copy from the desired point in the block
+		 */
+		offset = (src & (blklen - 1));
+		segment_size = MIN(blklen - offset, size);
+
+		memcpy(dst, buffer + offset, segment_size);
+
+		dst += segment_size;
+		src += segment_size;
+		size -= segment_size;
+	}
+
+free_buffer:
+	free(buffer);
+
+	return err;
+}
+
+static ulong mmc_bread(int dev_num, ulong start, lbaint_t blkcnt, void *dst)
+{
+	int err;
+	int i;
+	struct mmc *mmc = find_mmc_device(dev_num);
+
+	if (!mmc)
+		return 0;
+
+	/* We always do full block reads from the card */
+	err = mmc_set_blocklen(mmc, mmc->read_bl_len);
+
+	if (err) {
+		return 0;
+	}
+
+	for (i = start; i < start + blkcnt; i++, dst += mmc->read_bl_len) {
+		err = mmc_read_block(mmc, dst, i);
+
+		if (err) {
+			printf("block read failed: %d\n", err);
+			return i - start;
+		}
+	}
+
+	return blkcnt;
+}
+
+int mmc_go_idle(struct mmc* mmc)
+{
+	struct mmc_cmd cmd;
+	int err;
+
+	udelay(1000);
+
+	cmd.cmdidx = MMC_CMD_GO_IDLE_STATE;
+	cmd.cmdarg = 0;
+	cmd.resp_type = MMC_RSP_NONE;
+	cmd.flags = 0;
+
+	err = mmc_send_cmd(mmc, &cmd, NULL);
+
+	if (err)
+		return err;
+
+	udelay(2000);
+
+	return 0;
+}
+
+int
+sd_send_op_cond(struct mmc *mmc)
+{
+	int timeout = 1000;
+	int err;
+	struct mmc_cmd cmd;
+
+	do {
+		cmd.cmdidx = MMC_CMD_APP_CMD;
+		cmd.resp_type = MMC_RSP_R1;
+		cmd.cmdarg = 0;
+		cmd.flags = 0;
+
+		err = mmc_send_cmd(mmc, &cmd, NULL);
+
+		if (err)
+			return err;
+
+		cmd.cmdidx = SD_CMD_APP_SEND_OP_COND;
+		cmd.resp_type = MMC_RSP_R3;
+		cmd.cmdarg = mmc->voltages;
+
+		if (mmc->version == SD_VERSION_2)
+			cmd.cmdarg |= OCR_HCS;
+
+		err = mmc_send_cmd(mmc, &cmd, NULL);
+
+		if (err)
+			return err;
+
+		udelay(1000);
+	} while ((!(cmd.response[0] & OCR_BUSY)) && timeout--);
+
+	if (timeout <= 0)
+		return UNUSABLE_ERR;
+
+	if (mmc->version != SD_VERSION_2)
+		mmc->version = SD_VERSION_1_0;
+
+	mmc->ocr = ((uint *)(cmd.response))[0];
+
+	mmc->high_capacity = ((mmc->ocr & OCR_HCS) == OCR_HCS);
+	mmc->rca = 0;
+
+	return 0;
+}
+
+int mmc_send_op_cond(struct mmc *mmc)
+{
+	int timeout = 1000;
+	struct mmc_cmd cmd;
+	int err;
+
+	/* Some cards seem to need this */
+	mmc_go_idle(mmc);
+
+	do {
+		cmd.cmdidx = MMC_CMD_SEND_OP_COND;
+		cmd.resp_type = MMC_RSP_R3;
+		cmd.cmdarg = OCR_HCS | mmc->voltages;
+		cmd.flags = 0;
+
+		err = mmc_send_cmd(mmc, &cmd, NULL);
+
+		if (err)
+			return err;
+
+		udelay(1000);
+	} while (!(cmd.response[0] & OCR_BUSY) && timeout--);
+
+	if (timeout <= 0)
+		return UNUSABLE_ERR;
+
+	mmc->version = MMC_VERSION_UNKNOWN;
+	mmc->ocr = ((uint *)(cmd.response))[0];
+
+	mmc->high_capacity = ((mmc->ocr & OCR_HCS) == OCR_HCS);
+	mmc->rca = 0;
+
+	return 0;
+}
+
+
+int mmc_send_ext_csd(struct mmc *mmc, char *ext_csd)
+{
+	struct mmc_cmd cmd;
+	struct mmc_data data;
+	int err;
+
+	/* Get the Card Status Register */
+	cmd.cmdidx = MMC_CMD_SEND_EXT_CSD;
+	cmd.resp_type = MMC_RSP_R1;
+	cmd.cmdarg = 0;
+	cmd.flags = 0;
+
+	data.dest = ext_csd;
+	data.blocks = 1;
+	data.blocksize = 512;
+	data.flags = MMC_DATA_READ;
+
+	err = mmc_send_cmd(mmc, &cmd, &data);
+
+	return err;
+}
+
+
+int mmc_switch(struct mmc *mmc, u8 set, u8 index, u8 value)
+{
+	struct mmc_cmd cmd;
+
+	cmd.cmdidx = MMC_CMD_SWITCH;
+	cmd.resp_type = MMC_RSP_R1b;
+	cmd.cmdarg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
+		(index << 16) |
+		(value << 8);
+	cmd.flags = 0;
+
+	return mmc_send_cmd(mmc, &cmd, NULL);
+}
+
+int mmc_change_freq(struct mmc *mmc)
+{
+	char ext_csd[512];
+	char cardtype;
+	int err;
+
+	mmc->card_caps = 0;
+
+	/* Only version 4 supports high-speed */
+	if (mmc->version < MMC_VERSION_4)
+		return 0;
+
+	mmc->card_caps |= MMC_MODE_4BIT;
+
+	err = mmc_send_ext_csd(mmc, ext_csd);
+
+	if (err)
+		return err;
+
+	if (ext_csd[212] || ext_csd[213] || ext_csd[214] || ext_csd[215])
+		mmc->high_capacity = 1;
+
+	cardtype = ext_csd[196] & 0xf;
+
+	err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING, 1);
+
+	if (err)
+		return err;
+
+	/* Now check to see that it worked */
+	err = mmc_send_ext_csd(mmc, ext_csd);
+
+	if (err)
+		return err;
+
+	/* No high-speed support */
+	if (!ext_csd[185])
+		return 0;
+
+	/* High Speed is set, there are two types: 52MHz and 26MHz */
+	if (cardtype & MMC_HS_52MHZ)
+		mmc->card_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS;
+	else
+		mmc->card_caps |= MMC_MODE_HS;
+
+	return 0;
+}
+
+int sd_switch(struct mmc *mmc, int mode, int group, u8 value, u8 *resp)
+{
+	struct mmc_cmd cmd;
+	struct mmc_data data;
+
+	/* Switch the frequency */
+	cmd.cmdidx = SD_CMD_SWITCH_FUNC;
+	cmd.resp_type = MMC_RSP_R1;
+	cmd.cmdarg = (mode << 31) | 0xffffff;
+	cmd.cmdarg &= ~(0xf << (group * 4));
+	cmd.cmdarg |= value << (group * 4);
+	cmd.flags = 0;
+
+	data.dest = (char *)resp;
+	data.blocksize = 64;
+	data.blocks = 1;
+	data.flags = MMC_DATA_READ;
+
+	return mmc_send_cmd(mmc, &cmd, &data);
+}
+
+
+int sd_change_freq(struct mmc *mmc)
+{
+	int err;
+	struct mmc_cmd cmd;
+	uint scr[2];
+	uint switch_status[16];
+	struct mmc_data data;
+	int timeout;
+
+	mmc->card_caps = 0;
+
+	/* Read the SCR to find out if this card supports higher speeds */
+	cmd.cmdidx = MMC_CMD_APP_CMD;
+	cmd.resp_type = MMC_RSP_R1;
+	cmd.cmdarg = mmc->rca << 16;
+	cmd.flags = 0;
+
+	err = mmc_send_cmd(mmc, &cmd, NULL);
+
+	if (err)
+		return err;
+
+	cmd.cmdidx = SD_CMD_APP_SEND_SCR;
+	cmd.resp_type = MMC_RSP_R1;
+	cmd.cmdarg = 0;
+	cmd.flags = 0;
+
+	timeout = 3;
+
+retry_scr:
+	data.dest = (char *)&scr;
+	data.blocksize = 8;
+	data.blocks = 1;
+	data.flags = MMC_DATA_READ;
+
+	err = mmc_send_cmd(mmc, &cmd, &data);
+
+	if (err) {
+		if (timeout--)
+			goto retry_scr;
+
+		return err;
+	}
+
+	mmc->scr[0] = scr[0];
+	mmc->scr[1] = scr[1];
+
+	switch ((mmc->scr[0] >> 24) & 0xf) {
+		case 0:
+			mmc->version = SD_VERSION_1_0;
+			break;
+		case 1:
+			mmc->version = SD_VERSION_1_10;
+			break;
+		case 2:
+			mmc->version = SD_VERSION_2;
+			break;
+		default:
+			mmc->version = SD_VERSION_1_0;
+			break;
+	}
+
+	/* Version 1.0 doesn't support switching */
+	if (mmc->version == SD_VERSION_1_0)
+		return 0;
+
+	timeout = 4;
+	while (timeout--) {
+		err = sd_switch(mmc, SD_SWITCH_CHECK, 0, 1,
+				(u8 *)&switch_status);
+
+		if (err)
+			return err;
+
+		/* The high-speed function is busy.  Try again */
+		if (!switch_status[7] & SD_HIGHSPEED_BUSY)
+			break;
+	}
+
+	if (mmc->scr[0] & SD_DATA_4BIT)
+		mmc->card_caps |= MMC_MODE_4BIT;
+
+	/* If high-speed isn't supported, we return */
+	if (!(switch_status[3] & SD_HIGHSPEED_SUPPORTED))
+		return 0;
+
+	err = sd_switch(mmc, SD_SWITCH_SWITCH, 0, 1, (u8 *)&switch_status);
+
+	if (err)
+		return err;
+
+	if ((switch_status[4] & 0x0f000000) == 0x01000000)
+		mmc->card_caps |= MMC_MODE_HS;
+
+	return 0;
+}
+
+/* frequency bases */
+/* divided by 10 to be nice to platforms without floating point */
+int fbase[] = {
+	10000,
+	100000,
+	1000000,
+	10000000,
+};
+
+/* Multiplier values for TRAN_SPEED.  Multiplied by 10 to be nice
+ * to platforms without floating point.
+ */
+int multipliers[] = {
+	0,	/* reserved */
+	10,
+	12,
+	13,
+	15,
+	20,
+	25,
+	30,
+	35,
+	40,
+	45,
+	50,
+	55,
+	60,
+	70,
+	80,
+};
+
+void mmc_set_ios(struct mmc *mmc)
+{
+	mmc->set_ios(mmc);
+}
+
+void mmc_set_clock(struct mmc *mmc, uint clock)
+{
+	if (clock > mmc->f_max)
+		clock = mmc->f_max;
+
+	if (clock < mmc->f_min)
+		clock = mmc->f_min;
+
+	mmc->clock = clock;
+
+	mmc_set_ios(mmc);
+}
+
+void mmc_set_bus_width(struct mmc *mmc, uint width)
+{
+	mmc->bus_width = width;
+
+	mmc_set_ios(mmc);
+}
+
+int mmc_startup(struct mmc *mmc)
+{
+	int err;
+	uint mult, freq;
+	u64 cmult, csize;
+	struct mmc_cmd cmd;
+
+	/* Put the Card in Identify Mode */
+	cmd.cmdidx = MMC_CMD_ALL_SEND_CID;
+	cmd.resp_type = MMC_RSP_R2;
+	cmd.cmdarg = 0;
+	cmd.flags = 0;
+
+	err = mmc_send_cmd(mmc, &cmd, NULL);
+
+	if (err)
+		return err;
+
+	memcpy(mmc->cid, cmd.response, 16);
+
+	/*
+	 * For MMC cards, set the Relative Address.
+	 * For SD cards, get the Relatvie Address.
+	 * This also puts the cards into Standby State
+	 */
+	cmd.cmdidx = SD_CMD_SEND_RELATIVE_ADDR;
+	cmd.cmdarg = mmc->rca << 16;
+	cmd.resp_type = MMC_RSP_R6;
+	cmd.flags = 0;
+
+	err = mmc_send_cmd(mmc, &cmd, NULL);
+
+	if (err)
+		return err;
+
+	if (IS_SD(mmc))
+		mmc->rca = (((uint *)(cmd.response))[0] >> 16) & 0xffff;
+
+	/* Get the Card-Specific Data */
+	cmd.cmdidx = MMC_CMD_SEND_CSD;
+	cmd.resp_type = MMC_RSP_R2;
+	cmd.cmdarg = mmc->rca << 16;
+	cmd.flags = 0;
+
+	err = mmc_send_cmd(mmc, &cmd, NULL);
+
+	if (err)
+		return err;
+
+	mmc->csd[0] = ((uint *)(cmd.response))[0];
+	mmc->csd[1] = ((uint *)(cmd.response))[1];
+	mmc->csd[2] = ((uint *)(cmd.response))[2];
+	mmc->csd[3] = ((uint *)(cmd.response))[3];
+
+	if (mmc->version == MMC_VERSION_UNKNOWN) {
+		int version = (cmd.response[0] >> 2) & 0xf;
+
+		switch (version) {
+			case 0:
+				mmc->version = MMC_VERSION_1_2;
+				break;
+			case 1:
+				mmc->version = MMC_VERSION_1_4;
+				break;
+			case 2:
+				mmc->version = MMC_VERSION_2_2;
+				break;
+			case 3:
+				mmc->version = MMC_VERSION_3;
+				break;
+			case 4:
+				mmc->version = MMC_VERSION_4;
+				break;
+			default:
+				mmc->version = MMC_VERSION_1_2;
+				break;
+		}
+	}
+
+	/* divide frequency by 10, since the mults are 10x bigger */
+	freq = fbase[(cmd.response[3] & 0x7)];
+	mult = multipliers[((cmd.response[3] >> 3) & 0xf)];
+
+	mmc->tran_speed = freq * mult;
+
+	mmc->read_bl_len = 1 << ((((uint *)(cmd.response))[1] >> 16) & 0xf);
+
+	if (IS_SD(mmc))
+		mmc->write_bl_len = mmc->read_bl_len;
+	else
+		mmc->write_bl_len = 1 << ((((uint *)(cmd.response))[3] >> 22) & 0xf);
+
+	if (mmc->high_capacity) {
+		csize = (mmc->csd[1] & 0x3f) << 16
+			| (mmc->csd[2] & 0xffff0000) >> 16;
+		cmult = 8;
+	} else {
+		csize = (mmc->csd[1] & 0x3ff) << 2
+			| (mmc->csd[2] & 0xc0000000) >> 30;
+		cmult = (mmc->csd[2] & 0x00038000) >> 15;
+	}
+
+	mmc->capacity = (csize + 1) << (cmult + 2);
+	mmc->capacity *= mmc->read_bl_len;
+
+	if (mmc->read_bl_len > 512)
+		mmc->read_bl_len = 512;
+
+	if (mmc->write_bl_len > 512)
+		mmc->write_bl_len = 512;
+
+	/* Select the card, and put it into Transfer Mode */
+	cmd.cmdidx = MMC_CMD_SELECT_CARD;
+	cmd.resp_type = MMC_RSP_R1b;
+	cmd.cmdarg = mmc->rca << 16;
+	cmd.flags = 0;
+	err = mmc_send_cmd(mmc, &cmd, NULL);
+
+	if (err)
+		return err;
+
+	if (IS_SD(mmc))
+		err = sd_change_freq(mmc);
+	else
+		err = mmc_change_freq(mmc);
+
+	if (err)
+		return err;
+
+	/* Restrict card's capabilities by what the host can do */
+	mmc->card_caps &= mmc->host_caps;
+
+	if (IS_SD(mmc)) {
+		if (mmc->card_caps & MMC_MODE_4BIT) {
+			cmd.cmdidx = MMC_CMD_APP_CMD;
+			cmd.resp_type = MMC_RSP_R1;
+			cmd.cmdarg = mmc->rca << 16;
+			cmd.flags = 0;
+
+			err = mmc_send_cmd(mmc, &cmd, NULL);
+			if (err)
+				return err;
+
+			cmd.cmdidx = SD_CMD_APP_SET_BUS_WIDTH;
+			cmd.resp_type = MMC_RSP_R1;
+			cmd.cmdarg = 2;
+			cmd.flags = 0;
+			err = mmc_send_cmd(mmc, &cmd, NULL);
+			if (err)
+				return err;
+
+			mmc_set_bus_width(mmc, 4);
+		}
+
+		if (mmc->card_caps & MMC_MODE_HS)
+			mmc_set_clock(mmc, 50000000);
+		else
+			mmc_set_clock(mmc, 25000000);
+	} else {
+		if (mmc->card_caps & MMC_MODE_4BIT) {
+			/* Set the card to use 4 bit*/
+			err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
+					EXT_CSD_BUS_WIDTH,
+					EXT_CSD_BUS_WIDTH_4);
+
+			if (err)
+				return err;
+
+			mmc_set_bus_width(mmc, 4);
+		} else if (mmc->card_caps & MMC_MODE_8BIT) {
+			/* Set the card to use 8 bit*/
+			err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
+					EXT_CSD_BUS_WIDTH,
+					EXT_CSD_BUS_WIDTH_8);
+
+			if (err)
+				return err;
+
+			mmc_set_bus_width(mmc, 8);
+		}
+
+		if (mmc->card_caps & MMC_MODE_HS) {
+			if (mmc->card_caps & MMC_MODE_HS_52MHz)
+				mmc_set_clock(mmc, 52000000);
+			else
+				mmc_set_clock(mmc, 26000000);
+		} else
+			mmc_set_clock(mmc, 20000000);
+	}
+
+	/* fill in device description */
+	mmc->block_dev.lun = 0;
+	mmc->block_dev.type = 0;
+	mmc->block_dev.blksz = mmc->read_bl_len;
+	mmc->block_dev.lba = mmc->capacity/mmc->read_bl_len;
+	sprintf(mmc->block_dev.vendor,"Man %02x%02x%02x Snr %02x%02x%02x%02x",
+			mmc->cid[0], mmc->cid[1], mmc->cid[2],
+			mmc->cid[9], mmc->cid[10], mmc->cid[11], mmc->cid[12]);
+	sprintf(mmc->block_dev.product,"%c%c%c%c%c", mmc->cid[3],
+			mmc->cid[4], mmc->cid[5], mmc->cid[6], mmc->cid[7]);
+	sprintf(mmc->block_dev.revision,"%d.%d", mmc->cid[8] >> 4,
+			mmc->cid[8] & 0xf);
+	init_part(&mmc->block_dev);
+
+	return 0;
+}
+
+int mmc_send_if_cond(struct mmc *mmc)
+{
+	struct mmc_cmd cmd;
+	int err;
+
+	cmd.cmdidx = SD_CMD_SEND_IF_COND;
+	/* We set the bit if the host supports voltages between 2.7 and 3.6 V */
+	cmd.cmdarg = ((mmc->voltages & 0xff8000) != 0) << 8 | 0xaa;
+	cmd.resp_type = MMC_RSP_R7;
+	cmd.flags = 0;
+
+	err = mmc_send_cmd(mmc, &cmd, NULL);
+
+	if (err)
+		return err;
+
+	if ((((uint *)(cmd.response))[0] & 0xff) != 0xaa)
+		return UNUSABLE_ERR;
+	else
+		mmc->version = SD_VERSION_2;
+
+	return 0;
+}
+
+int mmc_register(struct mmc *mmc)
+{
+	/* Setup the universal parts of the block interface just once */
+	mmc->block_dev.if_type = IF_TYPE_MMC;
+	mmc->block_dev.dev = cur_dev_num++;
+	mmc->block_dev.removable = 1;
+	mmc->block_dev.block_read = mmc_bread;
+	mmc->block_dev.block_write = mmc_bwrite;
+
+	INIT_LIST_HEAD (&mmc->link);
+
+	list_add_tail (&mmc->link, &mmc_devices);
+
+	return 0;
+}
+
+block_dev_desc_t *mmc_get_dev(int dev)
+{
+	struct mmc *mmc = find_mmc_device(dev);
+
+	return &mmc->block_dev;
+}
+
+int mmc_init(struct mmc *mmc)
+{
+	int err;
+
+	err = mmc->init(mmc);
+
+	if (err)
+		return err;
+
+	/* Reset the Card */
+	err = mmc_go_idle(mmc);
+
+	if (err)
+		return err;
+
+	/* Test for SD version 2 */
+	err = mmc_send_if_cond(mmc);
+
+	/* If we got an error other than timeout, we bail */
+	if (err && err != TIMEOUT)
+		return err;
+
+	/* Now try to get the SD card's operating condition */
+	err = sd_send_op_cond(mmc);
+
+	/* If the command timed out, we check for an MMC card */
+	if (err == TIMEOUT) {
+		err = mmc_send_op_cond(mmc);
+
+		if (err) {
+			printf("Card did not respond to voltage select!\n");
+			return UNUSABLE_ERR;
+		}
+	}
+
+	return mmc_startup(mmc);
+}
+
+/*
+ * CPU and board-specific MMC initializations.  Aliased function
+ * signals caller to move on
+ */
+static int __def_mmc_init(bd_t *bis)
+{
+	return -1;
+}
+
+int cpu_mmc_init(bd_t *bis) __attribute((weak, alias("__def_mmc_init")));
+int board_mmc_init(bd_t *bis) __attribute((weak, alias("__def_mmc_init")));
+
+void print_mmc_devices(char separator)
+{
+	struct mmc *m;
+	struct list_head *entry;
+
+	list_for_each(entry, &mmc_devices) {
+		m = list_entry(entry, struct mmc, link);
+
+		printf("%s: %d", m->name, m->block_dev.dev);
+
+		if (entry->next != &mmc_devices)
+			printf("%c ", separator);
+	}
+
+	printf("\n");
+}
+
+int mmc_initialize(bd_t *bis)
+{
+	INIT_LIST_HEAD (&mmc_devices);
+	cur_dev_num = 0;
+
+	if (board_mmc_init(bis) < 0)
+		cpu_mmc_init(bis);
+
+	print_mmc_devices(',');
+
+	return 0;
+}