mmc.c

/*
 * Copyright 2008, Freescale Semiconductor, Inc
 * Andy Fleming
 *
 * Based vaguely on the Linux code
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <config.h>
#include <common.h>
#include <command.h>
#include <dm.h>
#include <dm/device-internal.h>
#include <errno.h>
#include <mmc.h>
#include <part.h>
#include <malloc.h>
#include <memalign.h>
#include <linux/list.h>
#include <div64.h>
#include "mmc_private.h"

__weak int board_mmc_getwp(struct mmc *mmc)
{
	return -1;
}

int mmc_getwp(struct mmc *mmc)
{
	int wp;

	wp = board_mmc_getwp(mmc);

	if (wp < 0) {
		if (mmc->cfg->ops->getwp)
			wp = mmc->cfg->ops->getwp(mmc);
		else
			wp = 0;
	}

	return wp;
}

__weak int board_mmc_getcd(struct mmc *mmc)
{
	return -1;
}

int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
{
	int ret;

#ifdef CONFIG_MMC_TRACE
	int i;
	u8 *ptr;

	printf("CMD_SEND:%d\n", cmd->cmdidx);
	printf("\t\tARG\t\t\t 0x%08X\n", cmd->cmdarg);
	ret = mmc->cfg->ops->send_cmd(mmc, cmd, data);
	if (ret) {
		printf("\t\tRET\t\t\t %d\n", ret);
	} else {
		switch (cmd->resp_type) {
		case MMC_RSP_NONE:
			printf("\t\tMMC_RSP_NONE\n");
			break;
		case MMC_RSP_R1:
			printf("\t\tMMC_RSP_R1,5,6,7 \t 0x%08X \n",
				cmd->response[0]);
			break;
		case MMC_RSP_R1b:
			printf("\t\tMMC_RSP_R1b\t\t 0x%08X \n",
				cmd->response[0]);
			break;
		case MMC_RSP_R2:
			printf("\t\tMMC_RSP_R2\t\t 0x%08X \n",
				cmd->response[0]);
			printf("\t\t          \t\t 0x%08X \n",
				cmd->response[1]);
			printf("\t\t          \t\t 0x%08X \n",
				cmd->response[2]);
			printf("\t\t          \t\t 0x%08X \n",
				cmd->response[3]);
			printf("\n");
			printf("\t\t\t\t\tDUMPING DATA\n");
			for (i = 0; i < 4; i++) {
				int j;
				printf("\t\t\t\t\t%03d - ", i*4);
				ptr = (u8 *)&cmd->response[i];
				ptr += 3;
				for (j = 0; j < 4; j++)
					printf("%02X ", *ptr--);
				printf("\n");
			}
			break;
		case MMC_RSP_R3:
			printf("\t\tMMC_RSP_R3,4\t\t 0x%08X \n",
				cmd->response[0]);
			break;
		default:
			printf("\t\tERROR MMC rsp not supported\n");
			break;
		}
	}
#else
	ret = mmc->cfg->ops->send_cmd(mmc, cmd, data);
#endif
	return ret;
}

int mmc_send_status(struct mmc *mmc, int timeout)
{
	struct mmc_cmd cmd;
	int err, retries = 5;
#ifdef CONFIG_MMC_TRACE
	int status;
#endif

	cmd.cmdidx = MMC_CMD_SEND_STATUS;
	cmd.resp_type = MMC_RSP_R1;
	if (!mmc_host_is_spi(mmc))
		cmd.cmdarg = mmc->rca << 16;

	while (1) {
		err = mmc_send_cmd(mmc, &cmd, NULL);
		if (!err) {
			if ((cmd.response[0] & MMC_STATUS_RDY_FOR_DATA) &&
			    (cmd.response[0] & MMC_STATUS_CURR_STATE) !=
			     MMC_STATE_PRG)
				break;
			else if (cmd.response[0] & MMC_STATUS_MASK) {
#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
				printf("Status Error: 0x%08X\n",
					cmd.response[0]);
#endif
				return COMM_ERR;
			}
		} else if (--retries < 0)
			return err;

		if (timeout-- <= 0)
			break;

		udelay(1000);
	}

#ifdef CONFIG_MMC_TRACE
	status = (cmd.response[0] & MMC_STATUS_CURR_STATE) >> 9;
	printf("CURR STATE:%d\n", status);
#endif
	if (timeout <= 0) {
#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
		printf("Timeout waiting card ready\n");
#endif
		return TIMEOUT;
	}

	return 0;
}

int mmc_set_blocklen(struct mmc *mmc, int len)
{
	struct mmc_cmd cmd;

	if (mmc->ddr_mode)
		return 0;

	cmd.cmdidx = MMC_CMD_SET_BLOCKLEN;
	cmd.resp_type = MMC_RSP_R1;
	cmd.cmdarg = len;

	return mmc_send_cmd(mmc, &cmd, NULL);
}

static int mmc_read_blocks(struct mmc *mmc, void *dst, lbaint_t start,
			   lbaint_t blkcnt)
{
	struct mmc_cmd cmd;
	struct mmc_data data;

	if (blkcnt > 1)
		cmd.cmdidx = MMC_CMD_READ_MULTIPLE_BLOCK;
	else
		cmd.cmdidx = MMC_CMD_READ_SINGLE_BLOCK;

	if (mmc->high_capacity)
		cmd.cmdarg = start;
	else
		cmd.cmdarg = start * mmc->read_bl_len;

	cmd.resp_type = MMC_RSP_R1;

	data.dest = dst;
	data.blocks = blkcnt;
	data.blocksize = mmc->read_bl_len;
	data.flags = MMC_DATA_READ;

	if (mmc_send_cmd(mmc, &cmd, &data))
		return 0;

	if (blkcnt > 1) {
		cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION;
		cmd.cmdarg = 0;
		cmd.resp_type = MMC_RSP_R1b;
		if (mmc_send_cmd(mmc, &cmd, NULL)) {
#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
			printf("mmc fail to send stop cmd\n");
#endif
			return 0;
		}
	}

	return blkcnt;
}

#ifdef CONFIG_BLK
static ulong mmc_bread(struct udevice *dev, lbaint_t start, lbaint_t blkcnt,
		       void *dst)
#else
static ulong mmc_bread(struct blk_desc *block_dev, lbaint_t start,
		       lbaint_t blkcnt, void *dst)
#endif
{
#ifdef CONFIG_BLK
	struct blk_desc *block_dev = dev_get_uclass_platdata(dev);
#endif
	int dev_num = block_dev->devnum;
	int err;
	lbaint_t cur, blocks_todo = blkcnt;

	if (blkcnt == 0)
		return 0;

	struct mmc *mmc = find_mmc_device(dev_num);
	if (!mmc)
		return 0;

	err = blk_dselect_hwpart(block_dev, block_dev->hwpart);
	if (err < 0)
		return 0;

	if ((start + blkcnt) > block_dev->lba) {
#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
		printf("MMC: block number 0x" LBAF " exceeds max(0x" LBAF ")\n",
			start + blkcnt, block_dev->lba);
#endif
		return 0;
	}

	if (mmc_set_blocklen(mmc, mmc->read_bl_len)) {
		debug("%s: Failed to set blocklen\n", __func__);
		return 0;
	}

	do {
		cur = (blocks_todo > mmc->cfg->b_max) ?
			mmc->cfg->b_max : blocks_todo;
		if (mmc_read_blocks(mmc, dst, start, cur) != cur) {
			debug("%s: Failed to read blocks\n", __func__);
			return 0;
		}
		blocks_todo -= cur;
		start += cur;
		dst += cur * mmc->read_bl_len;
	} while (blocks_todo > 0);

	return blkcnt;
}

static 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;

	err = mmc_send_cmd(mmc, &cmd, NULL);

	if (err)
		return err;

	udelay(2000);

	return 0;
}

static int sd_send_op_cond(struct mmc *mmc)
{
	int timeout = 1000;
	int err;
	struct mmc_cmd cmd;

	while (1) {
		cmd.cmdidx = MMC_CMD_APP_CMD;
		cmd.resp_type = MMC_RSP_R1;
		cmd.cmdarg = 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;

		/*
		 * Most cards do not answer if some reserved bits
		 * in the ocr are set. However, Some controller
		 * can set bit 7 (reserved for low voltages), but
		 * how to manage low voltages SD card is not yet
		 * specified.
		 */
		cmd.cmdarg = mmc_host_is_spi(mmc) ? 0 :
			(mmc->cfg->voltages & 0xff8000);

		if (mmc->version == SD_VERSION_2)
			cmd.cmdarg |= OCR_HCS;

		err = mmc_send_cmd(mmc, &cmd, NULL);

		if (err)
			return err;

		if (cmd.response[0] & OCR_BUSY)
			break;

		if (timeout-- <= 0)
			return UNUSABLE_ERR;

		udelay(1000);
	}

	if (mmc->version != SD_VERSION_2)
		mmc->version = SD_VERSION_1_0;

	if (mmc_host_is_spi(mmc)) { /* read OCR for spi */
		cmd.cmdidx = MMC_CMD_SPI_READ_OCR;
		cmd.resp_type = MMC_RSP_R3;
		cmd.cmdarg = 0;

		err = mmc_send_cmd(mmc, &cmd, NULL);

		if (err)
			return err;
	}

	mmc->ocr = cmd.response[0];

	mmc->high_capacity = ((mmc->ocr & OCR_HCS) == OCR_HCS);
	mmc->rca = 0;

	return 0;
}

static int mmc_send_op_cond_iter(struct mmc *mmc, int use_arg)
{
	struct mmc_cmd cmd;
	int err;

	cmd.cmdidx = MMC_CMD_SEND_OP_COND;
	cmd.resp_type = MMC_RSP_R3;
	cmd.cmdarg = 0;
	if (use_arg && !mmc_host_is_spi(mmc))
		cmd.cmdarg = OCR_HCS |
			(mmc->cfg->voltages &
			(mmc->ocr & OCR_VOLTAGE_MASK)) |
			(mmc->ocr & OCR_ACCESS_MODE);

	err = mmc_send_cmd(mmc, &cmd, NULL);
	if (err)
		return err;
	mmc->ocr = cmd.response[0];
	return 0;
}

static int mmc_send_op_cond(struct mmc *mmc)
{
	int err, i;

	/* Some cards seem to need this */
	mmc_go_idle(mmc);

 	/* Asking to the card its capabilities */
	for (i = 0; i < 2; i++) {
		err = mmc_send_op_cond_iter(mmc, i != 0);
		if (err)
			return err;

		/* exit if not busy (flag seems to be inverted) */
		if (mmc->ocr & OCR_BUSY)
			break;
	}
	mmc->op_cond_pending = 1;
	return 0;
}

static int mmc_complete_op_cond(struct mmc *mmc)
{
	struct mmc_cmd cmd;
	int timeout = 1000;
	uint start;
	int err;

	mmc->op_cond_pending = 0;
	if (!(mmc->ocr & OCR_BUSY)) {
		start = get_timer(0);
		while (1) {
			err = mmc_send_op_cond_iter(mmc, 1);
			if (err)
				return err;
			if (mmc->ocr & OCR_BUSY)
				break;
			if (get_timer(start) > timeout)
				return UNUSABLE_ERR;
			udelay(100);
		}
	}

	if (mmc_host_is_spi(mmc)) { /* read OCR for spi */
		cmd.cmdidx = MMC_CMD_SPI_READ_OCR;
		cmd.resp_type = MMC_RSP_R3;
		cmd.cmdarg = 0;

		err = mmc_send_cmd(mmc, &cmd, NULL);

		if (err)
			return err;

		mmc->ocr = cmd.response[0];
	}

	mmc->version = MMC_VERSION_UNKNOWN;

	mmc->high_capacity = ((mmc->ocr & OCR_HCS) == OCR_HCS);
	mmc->rca = 1;

	return 0;
}


static int mmc_send_ext_csd(struct mmc *mmc, u8 *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;

	data.dest = (char *)ext_csd;
	data.blocks = 1;
	data.blocksize = MMC_MAX_BLOCK_LEN;
	data.flags = MMC_DATA_READ;

	err = mmc_send_cmd(mmc, &cmd, &data);

	return err;
}


static int mmc_switch(struct mmc *mmc, u8 set, u8 index, u8 value)
{
	struct mmc_cmd cmd;
	int timeout = 1000;
	int ret;

	cmd.cmdidx = MMC_CMD_SWITCH;
	cmd.resp_type = MMC_RSP_R1b;
	cmd.cmdarg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
				 (index << 16) |
				 (value << 8);

	ret = mmc_send_cmd(mmc, &cmd, NULL);

	/* Waiting for the ready status */
	if (!ret)
		ret = mmc_send_status(mmc, timeout);

	return ret;

}

static int mmc_change_freq(struct mmc *mmc)
{
	ALLOC_CACHE_ALIGN_BUFFER(u8, ext_csd, MMC_MAX_BLOCK_LEN);
	char cardtype;
	int err;

	mmc->card_caps = 0;

	if (mmc_host_is_spi(mmc))
		return 0;

	/* Only version 4 supports high-speed */
	if (mmc->version < MMC_VERSION_4)
		return 0;

	mmc->card_caps |= MMC_MODE_4BIT | MMC_MODE_8BIT;

	err = mmc_send_ext_csd(mmc, ext_csd);

	if (err)
		return err;

	cardtype = ext_csd[EXT_CSD_CARD_TYPE] & 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[EXT_CSD_HS_TIMING])
		return 0;

	/* High Speed is set, there are two types: 52MHz and 26MHz */
	if (cardtype & EXT_CSD_CARD_TYPE_52) {
		if (cardtype & EXT_CSD_CARD_TYPE_DDR_1_8V)
			mmc->card_caps |= MMC_MODE_DDR_52MHz;
		mmc->card_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS;
	} else {
		mmc->card_caps |= MMC_MODE_HS;
	}

	return 0;
}

static int mmc_set_capacity(struct mmc *mmc, int part_num)
{
	switch (part_num) {
	case 0:
		mmc->capacity = mmc->capacity_user;
		break;
	case 1:
	case 2:
		mmc->capacity = mmc->capacity_boot;
		break;
	case 3:
		mmc->capacity = mmc->capacity_rpmb;
		break;
	case 4:
	case 5:
	case 6:
	case 7:
		mmc->capacity = mmc->capacity_gp[part_num - 4];
		break;
	default:
		return -1;
	}

	mmc_get_blk_desc(mmc)->lba = lldiv(mmc->capacity, mmc->read_bl_len);

	return 0;
}

static int mmc_switch_part(struct mmc *mmc, unsigned int part_num)
{
	int ret;

	ret = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONF,
			 (mmc->part_config & ~PART_ACCESS_MASK)
			 | (part_num & PART_ACCESS_MASK));

	/*
	 * Set the capacity if the switch succeeded or was intended
	 * to return to representing the raw device.
	 */
	if ((ret == 0) || ((ret == -ENODEV) && (part_num == 0))) {
		ret = mmc_set_capacity(mmc, part_num);
		mmc_get_blk_desc(mmc)->hwpart = part_num;
	}

	return ret;
}

#ifdef CONFIG_BLK
static int mmc_select_hwpart(struct udevice *bdev, int hwpart)
{
	struct udevice *mmc_dev = dev_get_parent(bdev);
	struct mmc *mmc = mmc_get_mmc_dev(mmc_dev);
	struct blk_desc *desc = dev_get_uclass_platdata(bdev);
	int ret;

	if (desc->hwpart == hwpart)
		return 0;

	if (mmc->part_config == MMCPART_NOAVAILABLE)
		return -EMEDIUMTYPE;

	ret = mmc_switch_part(mmc, hwpart);
	if (ret)
		return ret;

	return 0;
}
#else
static int mmc_select_hwpartp(struct blk_desc *desc, int hwpart)
{
	struct mmc *mmc = find_mmc_device(desc->devnum);
	int ret;

	if (!mmc)
		return -ENODEV;

	if (mmc->block_dev.hwpart == hwpart)
		return 0;

	if (mmc->part_config == MMCPART_NOAVAILABLE)
		return -EMEDIUMTYPE;

	ret = mmc_switch_part(mmc, hwpart);
	if (ret)
		return ret;

	return 0;
}
#endif

int mmc_hwpart_config(struct mmc *mmc,
		      const struct mmc_hwpart_conf *conf,
		      enum mmc_hwpart_conf_mode mode)
{
	u8 part_attrs = 0;
	u32 enh_size_mult;
	u32 enh_start_addr;
	u32 gp_size_mult[4];
	u32 max_enh_size_mult;
	u32 tot_enh_size_mult = 0;
	u8 wr_rel_set;
	int i, pidx, err;
	ALLOC_CACHE_ALIGN_BUFFER(u8, ext_csd, MMC_MAX_BLOCK_LEN);

	if (mode < MMC_HWPART_CONF_CHECK || mode > MMC_HWPART_CONF_COMPLETE)
		return -EINVAL;

	if (IS_SD(mmc) || (mmc->version < MMC_VERSION_4_41)) {
		printf("eMMC >= 4.4 required for enhanced user data area\n");
		return -EMEDIUMTYPE;
	}

	if (!(mmc->part_support & PART_SUPPORT)) {
		printf("Card does not support partitioning\n");
		return -EMEDIUMTYPE;
	}

	if (!mmc->hc_wp_grp_size) {
		printf("Card does not define HC WP group size\n");
		return -EMEDIUMTYPE;
	}

	/* check partition alignment and total enhanced size */
	if (conf->user.enh_size) {
		if (conf->user.enh_size % mmc->hc_wp_grp_size ||
		    conf->user.enh_start % mmc->hc_wp_grp_size) {
			printf("User data enhanced area not HC WP group "
			       "size aligned\n");
			return -EINVAL;
		}
		part_attrs |= EXT_CSD_ENH_USR;
		enh_size_mult = conf->user.enh_size / mmc->hc_wp_grp_size;
		if (mmc->high_capacity) {
			enh_start_addr = conf->user.enh_start;
		} else {
			enh_start_addr = (conf->user.enh_start << 9);
		}
	} else {
		enh_size_mult = 0;
		enh_start_addr = 0;
	}
	tot_enh_size_mult += enh_size_mult;

	for (pidx = 0; pidx < 4; pidx++) {
		if (conf->gp_part[pidx].size % mmc->hc_wp_grp_size) {
			printf("GP%i partition not HC WP group size "
			       "aligned\n", pidx+1);
			return -EINVAL;
		}
		gp_size_mult[pidx] = conf->gp_part[pidx].size / mmc->hc_wp_grp_size;
		if (conf->gp_part[pidx].size && conf->gp_part[pidx].enhanced) {
			part_attrs |= EXT_CSD_ENH_GP(pidx);
			tot_enh_size_mult += gp_size_mult[pidx];
		}
	}

	if (part_attrs && ! (mmc->part_support & ENHNCD_SUPPORT)) {
		printf("Card does not support enhanced attribute\n");
		return -EMEDIUMTYPE;
	}

	err = mmc_send_ext_csd(mmc, ext_csd);
	if (err)
		return err;

	max_enh_size_mult =
		(ext_csd[EXT_CSD_MAX_ENH_SIZE_MULT+2] << 16) +
		(ext_csd[EXT_CSD_MAX_ENH_SIZE_MULT+1] << 8) +
		ext_csd[EXT_CSD_MAX_ENH_SIZE_MULT];
	if (tot_enh_size_mult > max_enh_size_mult) {
		printf("Total enhanced size exceeds maximum (%u > %u)\n",
		       tot_enh_size_mult, max_enh_size_mult);
		return -EMEDIUMTYPE;
	}

	/* The default value of EXT_CSD_WR_REL_SET is device
	 * dependent, the values can only be changed if the
	 * EXT_CSD_HS_CTRL_REL bit is set. The values can be
	 * changed only once and before partitioning is completed. */
	wr_rel_set = ext_csd[EXT_CSD_WR_REL_SET];
	if (conf->user.wr_rel_change) {
		if (conf->user.wr_rel_set)
			wr_rel_set |= EXT_CSD_WR_DATA_REL_USR;
		else
			wr_rel_set &= ~EXT_CSD_WR_DATA_REL_USR;
	}
	for (pidx = 0; pidx < 4; pidx++) {
		if (conf->gp_part[pidx].wr_rel_change) {
			if (conf->gp_part[pidx].wr_rel_set)
				wr_rel_set |= EXT_CSD_WR_DATA_REL_GP(pidx);
			else
				wr_rel_set &= ~EXT_CSD_WR_DATA_REL_GP(pidx);
		}
	}

	if (wr_rel_set != ext_csd[EXT_CSD_WR_REL_SET] &&
	    !(ext_csd[EXT_CSD_WR_REL_PARAM] & EXT_CSD_HS_CTRL_REL)) {
		puts("Card does not support host controlled partition write "
		     "reliability settings\n");
		return -EMEDIUMTYPE;
	}

	if (ext_csd[EXT_CSD_PARTITION_SETTING] &
	    EXT_CSD_PARTITION_SETTING_COMPLETED) {
		printf("Card already partitioned\n");
		return -EPERM;
	}

	if (mode == MMC_HWPART_CONF_CHECK)
		return 0;

	/* Partitioning requires high-capacity size definitions */
	if (!(ext_csd[EXT_CSD_ERASE_GROUP_DEF] & 0x01)) {
		err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
				 EXT_CSD_ERASE_GROUP_DEF, 1);

		if (err)
			return err;

		ext_csd[EXT_CSD_ERASE_GROUP_DEF] = 1;

		/* update erase group size to be high-capacity */
		mmc->erase_grp_size =
			ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] * 1024;

	}

	/* all OK, write the configuration */
	for (i = 0; i < 4; i++) {
		err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
				 EXT_CSD_ENH_START_ADDR+i,
				 (enh_start_addr >> (i*8)) & 0xFF);
		if (err)
			return err;
	}
	for (i = 0; i < 3; i++) {
		err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
				 EXT_CSD_ENH_SIZE_MULT+i,
				 (enh_size_mult >> (i*8)) & 0xFF);
		if (err)
			return err;
	}
	for (pidx = 0; pidx < 4; pidx++) {
		for (i = 0; i < 3; i++) {
			err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
					 EXT_CSD_GP_SIZE_MULT+pidx*3+i,
					 (gp_size_mult[pidx] >> (i*8)) & 0xFF);
			if (err)
				return err;
		}
	}
	err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
			 EXT_CSD_PARTITIONS_ATTRIBUTE, part_attrs);
	if (err)
		return err;

	if (mode == MMC_HWPART_CONF_SET)
		return 0;

	/* The WR_REL_SET is a write-once register but shall be
	 * written before setting PART_SETTING_COMPLETED. As it is
	 * write-once we can only write it when completing the
	 * partitioning. */
	if (wr_rel_set != ext_csd[EXT_CSD_WR_REL_SET]) {
		err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
				 EXT_CSD_WR_REL_SET, wr_rel_set);
		if (err)
			return err;
	}

	/* Setting PART_SETTING_COMPLETED confirms the partition
	 * configuration but it only becomes effective after power
	 * cycle, so we do not adjust the partition related settings
	 * in the mmc struct. */

	err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
			 EXT_CSD_PARTITION_SETTING,
			 EXT_CSD_PARTITION_SETTING_COMPLETED);
	if (err)
		return err;

	return 0;
}

int mmc_getcd(struct mmc *mmc)
{
	int cd;

	cd = board_mmc_getcd(mmc);

	if (cd < 0) {
		if (mmc->cfg->ops->getcd)
			cd = mmc->cfg->ops->getcd(mmc);
		else
			cd = 1;
	}

	return cd;
}

static 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);

	data.dest = (char *)resp;
	data.blocksize = 64;
	data.blocks = 1;
	data.flags = MMC_DATA_READ;

	return mmc_send_cmd(mmc, &cmd, &data);
}


static int sd_change_freq(struct mmc *mmc)
{
	int err;
	struct mmc_cmd cmd;
	ALLOC_CACHE_ALIGN_BUFFER(uint, scr, 2);
	ALLOC_CACHE_ALIGN_BUFFER(uint, switch_status, 16);
	struct mmc_data data;
	int timeout;

	mmc->card_caps = 0;

	if (mmc_host_is_spi(mmc))
		return 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;

	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;

	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] = __be32_to_cpu(scr[0]);
	mmc->scr[1] = __be32_to_cpu(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;
		if ((mmc->scr[0] >> 15) & 0x1)
			mmc->version = SD_VERSION_3;
		break;
	default:
		mmc->version = SD_VERSION_1_0;
		break;
	}

	if (mmc->scr[0] & SD_DATA_4BIT)
		mmc->card_caps |= MMC_MODE_4BIT;

	/* 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 (!(__be32_to_cpu(switch_status[7]) & SD_HIGHSPEED_BUSY))
			break;
	}

	/* If high-speed isn't supported, we return */
	if (!(__be32_to_cpu(switch_status[3]) & SD_HIGHSPEED_SUPPORTED))
		return 0;

	/*
	 * If the host doesn't support SD_HIGHSPEED, do not switch card to
	 * HIGHSPEED mode even if the card support SD_HIGHSPPED.
	 * This can avoid furthur problem when the card runs in different
	 * mode between the host.
	 */
	if (!((mmc->cfg->host_caps & MMC_MODE_HS_52MHz) &&
		(mmc->cfg->host_caps & MMC_MODE_HS)))
		return 0;

	err = sd_switch(mmc, SD_SWITCH_SWITCH, 0, 1, (u8 *)switch_status);

	if (err)
		return err;

	if ((__be32_to_cpu(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 */
static const int fbase[] = {
	10000,
	100000,
	1000000,
	10000000,
};

/* Multiplier values for TRAN_SPEED.  Multiplied by 10 to be nice
 * to platforms without floating point.
 */
static const u8 multipliers[] = {
	0,	/* reserved */
	10,
	12,
	13,
	15,
	20,
	25,
	30,
	35,
	40,
	45,
	50,
	55,
	60,
	70,