omap_hsmmc.c

/*
 * (C) Copyright 2008
 * Texas Instruments, <www.ti.com>
 * Sukumar Ghorai <s-ghorai@ti.com>
 *
 * 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's version 2 of
 * the License.
 *
 * 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 <malloc.h>
#include <memalign.h>
#include <mmc.h>
#include <part.h>
#include <i2c.h>
#if defined(CONFIG_OMAP54XX) || defined(CONFIG_OMAP44XX)
#include <palmas.h>
#endif
#include <asm/io.h>
#include <asm/arch/mmc_host_def.h>
#if !defined(CONFIG_SOC_KEYSTONE)
#include <asm/gpio.h>
#include <asm/arch/sys_proto.h>
#endif
#ifdef CONFIG_MMC_OMAP36XX_PINS
#include <asm/arch/mux.h>
#endif
#include <dm.h>

DECLARE_GLOBAL_DATA_PTR;

/* simplify defines to OMAP_HSMMC_USE_GPIO */
#if (defined(CONFIG_OMAP_GPIO) && !defined(CONFIG_SPL_BUILD)) || \
	(defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_GPIO_SUPPORT))
#define OMAP_HSMMC_USE_GPIO
#else
#undef OMAP_HSMMC_USE_GPIO
#endif

/* common definitions for all OMAPs */
#define SYSCTL_SRC	(1 << 25)
#define SYSCTL_SRD	(1 << 26)

struct omap_hsmmc_data {
	struct hsmmc *base_addr;
#if !CONFIG_IS_ENABLED(DM_MMC)
	struct mmc_config cfg;
#endif
	uint bus_width;
	uint clock;
#ifdef OMAP_HSMMC_USE_GPIO
#if CONFIG_IS_ENABLED(DM_MMC)
	struct gpio_desc cd_gpio;	/* Change Detect GPIO */
	struct gpio_desc wp_gpio;	/* Write Protect GPIO */
	bool cd_inverted;
#else
	int cd_gpio;
	int wp_gpio;
#endif
#endif
#if CONFIG_IS_ENABLED(DM_MMC)
	uint iov;
#endif
	u8 controller_flags;
#ifndef CONFIG_OMAP34XX
	struct omap_hsmmc_adma_desc *adma_desc_table;
	uint desc_slot;
#endif
};

#ifndef CONFIG_OMAP34XX
struct omap_hsmmc_adma_desc {
	u8 attr;
	u8 reserved;
	u16 len;
	u32 addr;
};

#define ADMA_MAX_LEN	63488

/* Decriptor table defines */
#define ADMA_DESC_ATTR_VALID		BIT(0)
#define ADMA_DESC_ATTR_END		BIT(1)
#define ADMA_DESC_ATTR_INT		BIT(2)
#define ADMA_DESC_ATTR_ACT1		BIT(4)
#define ADMA_DESC_ATTR_ACT2		BIT(5)

#define ADMA_DESC_TRANSFER_DATA		ADMA_DESC_ATTR_ACT2
#define ADMA_DESC_LINK_DESC	(ADMA_DESC_ATTR_ACT1 | ADMA_DESC_ATTR_ACT2)
#endif

/* If we fail after 1 second wait, something is really bad */
#define MAX_RETRY_MS	1000

/* DMA transfers can take a long time if a lot a data is transferred.
 * The timeout must take in account the amount of data. Let's assume
 * that the time will never exceed 333 ms per MB (in other word we assume
 * that the bandwidth is always above 3MB/s).
 */
#define DMA_TIMEOUT_PER_MB	333
#define OMAP_HSMMC_SUPPORTS_DUAL_VOLT		BIT(0)
#define OMAP_HSMMC_NO_1_8_V			BIT(1)
#define OMAP_HSMMC_USE_ADMA			BIT(2)

static int mmc_read_data(struct hsmmc *mmc_base, char *buf, unsigned int size);
static int mmc_write_data(struct hsmmc *mmc_base, const char *buf,
			unsigned int siz);
static void omap_hsmmc_start_clock(struct hsmmc *mmc_base);
static void omap_hsmmc_stop_clock(struct hsmmc *mmc_base);

static inline struct omap_hsmmc_data *omap_hsmmc_get_data(struct mmc *mmc)
{
#if CONFIG_IS_ENABLED(DM_MMC)
	return dev_get_priv(mmc->dev);
#else
	return (struct omap_hsmmc_data *)mmc->priv;
#endif
}
static inline struct mmc_config *omap_hsmmc_get_cfg(struct mmc *mmc)
{
#if CONFIG_IS_ENABLED(DM_MMC)
	struct omap_hsmmc_plat *plat = dev_get_platdata(mmc->dev);
	return &plat->cfg;
#else
	return &((struct omap_hsmmc_data *)mmc->priv)->cfg;
#endif
}

#if defined(OMAP_HSMMC_USE_GPIO) && !CONFIG_IS_ENABLED(DM_MMC)
static int omap_mmc_setup_gpio_in(int gpio, const char *label)
{
	int ret;

#ifndef CONFIG_DM_GPIO
	if (!gpio_is_valid(gpio))
		return -1;
#endif
	ret = gpio_request(gpio, label);
	if (ret)
		return ret;

	ret = gpio_direction_input(gpio);
	if (ret)
		return ret;

	return gpio;
}
#endif

static unsigned char mmc_board_init(struct mmc *mmc)
{
#if defined(CONFIG_OMAP34XX)
	struct mmc_config *cfg = omap_hsmmc_get_cfg(mmc);
	t2_t *t2_base = (t2_t *)T2_BASE;
	struct prcm *prcm_base = (struct prcm *)PRCM_BASE;
	u32 pbias_lite;
#ifdef CONFIG_MMC_OMAP36XX_PINS
	u32 wkup_ctrl = readl(OMAP34XX_CTRL_WKUP_CTRL);
#endif

	pbias_lite = readl(&t2_base->pbias_lite);
	pbias_lite &= ~(PBIASLITEPWRDNZ1 | PBIASLITEPWRDNZ0);
#ifdef CONFIG_TARGET_OMAP3_CAIRO
	/* for cairo board, we need to set up 1.8 Volt bias level on MMC1 */
	pbias_lite &= ~PBIASLITEVMODE0;
#endif
#ifdef CONFIG_MMC_OMAP36XX_PINS
	if (get_cpu_family() == CPU_OMAP36XX) {
		/* Disable extended drain IO before changing PBIAS */
		wkup_ctrl &= ~OMAP34XX_CTRL_WKUP_CTRL_GPIO_IO_PWRDNZ;
		writel(wkup_ctrl, OMAP34XX_CTRL_WKUP_CTRL);
	}
#endif
	writel(pbias_lite, &t2_base->pbias_lite);

	writel(pbias_lite | PBIASLITEPWRDNZ1 |
		PBIASSPEEDCTRL0 | PBIASLITEPWRDNZ0,
		&t2_base->pbias_lite);

#ifdef CONFIG_MMC_OMAP36XX_PINS
	if (get_cpu_family() == CPU_OMAP36XX)
		/* Enable extended drain IO after changing PBIAS */
		writel(wkup_ctrl |
				OMAP34XX_CTRL_WKUP_CTRL_GPIO_IO_PWRDNZ,
				OMAP34XX_CTRL_WKUP_CTRL);
#endif
	writel(readl(&t2_base->devconf0) | MMCSDIO1ADPCLKISEL,
		&t2_base->devconf0);

	writel(readl(&t2_base->devconf1) | MMCSDIO2ADPCLKISEL,
		&t2_base->devconf1);

	/* Change from default of 52MHz to 26MHz if necessary */
	if (!(cfg->host_caps & MMC_MODE_HS_52MHz))
		writel(readl(&t2_base->ctl_prog_io1) & ~CTLPROGIO1SPEEDCTRL,
			&t2_base->ctl_prog_io1);

	writel(readl(&prcm_base->fclken1_core) |
		EN_MMC1 | EN_MMC2 | EN_MMC3,
		&prcm_base->fclken1_core);

	writel(readl(&prcm_base->iclken1_core) |
		EN_MMC1 | EN_MMC2 | EN_MMC3,
		&prcm_base->iclken1_core);
#endif

#if defined(CONFIG_OMAP54XX) || defined(CONFIG_OMAP44XX)
	/* PBIAS config needed for MMC1 only */
	if (mmc_get_blk_desc(mmc)->devnum == 0)
		vmmc_pbias_config(LDO_VOLT_3V0);
#endif

	return 0;
}

void mmc_init_stream(struct hsmmc *mmc_base)
{
	ulong start;

	writel(readl(&mmc_base->con) | INIT_INITSTREAM, &mmc_base->con);

	writel(MMC_CMD0, &mmc_base->cmd);
	start = get_timer(0);
	while (!(readl(&mmc_base->stat) & CC_MASK)) {
		if (get_timer(0) - start > MAX_RETRY_MS) {
			printf("%s: timedout waiting for cc!\n", __func__);
			return;
		}
	}
	writel(CC_MASK, &mmc_base->stat)
		;
	writel(MMC_CMD0, &mmc_base->cmd)
		;
	start = get_timer(0);
	while (!(readl(&mmc_base->stat) & CC_MASK)) {
		if (get_timer(0) - start > MAX_RETRY_MS) {
			printf("%s: timedout waiting for cc2!\n", __func__);
			return;
		}
	}
	writel(readl(&mmc_base->con) & ~INIT_INITSTREAM, &mmc_base->con);
}

#if CONFIG_IS_ENABLED(DM_MMC)
static void omap_hsmmc_conf_bus_power(struct mmc *mmc)
{
	struct hsmmc *mmc_base;
	struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
	u32 val;

	mmc_base = priv->base_addr;

	val = readl(&mmc_base->hctl) & ~SDVS_MASK;

	switch (priv->iov) {
	case IOV_3V3:
		val |= SDVS_3V3;
		break;
	case IOV_3V0:
		val |= SDVS_3V0;
		break;
	case IOV_1V8:
		val |= SDVS_1V8;
		break;
	}

	writel(val, &mmc_base->hctl);
}

static void omap_hsmmc_set_capabilities(struct mmc *mmc)
{
	struct hsmmc *mmc_base;
	struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
	u32 val;

	mmc_base = priv->base_addr;
	val = readl(&mmc_base->capa);

	if (priv->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
		val |= (VS30_3V0SUP | VS18_1V8SUP);
		priv->iov = IOV_3V0;
	} else if (priv->controller_flags & OMAP_HSMMC_NO_1_8_V) {
		val |= VS30_3V0SUP;
		val &= ~VS18_1V8SUP;
		priv->iov = IOV_3V0;
	} else {
		val |= VS18_1V8SUP;
		val &= ~VS30_3V0SUP;
		priv->iov = IOV_1V8;
	}

	writel(val, &mmc_base->capa);
}
#endif

static int omap_hsmmc_init_setup(struct mmc *mmc)
{
	struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
	struct hsmmc *mmc_base;
	unsigned int reg_val;
	unsigned int dsor;
	ulong start;

	mmc_base = priv->base_addr;
	mmc_board_init(mmc);

	writel(readl(&mmc_base->sysconfig) | MMC_SOFTRESET,
		&mmc_base->sysconfig);
	start = get_timer(0);
	while ((readl(&mmc_base->sysstatus) & RESETDONE) == 0) {
		if (get_timer(0) - start > MAX_RETRY_MS) {
			printf("%s: timedout waiting for cc2!\n", __func__);
			return -ETIMEDOUT;
		}
	}
	writel(readl(&mmc_base->sysctl) | SOFTRESETALL, &mmc_base->sysctl);
	start = get_timer(0);
	while ((readl(&mmc_base->sysctl) & SOFTRESETALL) != 0x0) {
		if (get_timer(0) - start > MAX_RETRY_MS) {
			printf("%s: timedout waiting for softresetall!\n",
				__func__);
			return -ETIMEDOUT;
		}
	}
#ifndef CONFIG_OMAP34XX
	reg_val = readl(&mmc_base->hl_hwinfo);
	if (reg_val & MADMA_EN)
		priv->controller_flags |= OMAP_HSMMC_USE_ADMA;
#endif

#if CONFIG_IS_ENABLED(DM_MMC)
	omap_hsmmc_set_capabilities(mmc);
	omap_hsmmc_conf_bus_power(mmc);
#else
	writel(DTW_1_BITMODE | SDBP_PWROFF | SDVS_3V0, &mmc_base->hctl);
	writel(readl(&mmc_base->capa) | VS30_3V0SUP | VS18_1V8SUP,
		&mmc_base->capa);
#endif

	reg_val = readl(&mmc_base->con) & RESERVED_MASK;

	writel(CTPL_MMC_SD | reg_val | WPP_ACTIVEHIGH | CDP_ACTIVEHIGH |
		MIT_CTO | DW8_1_4BITMODE | MODE_FUNC | STR_BLOCK |
		HR_NOHOSTRESP | INIT_NOINIT | NOOPENDRAIN, &mmc_base->con);

	dsor = 240;
	mmc_reg_out(&mmc_base->sysctl, (ICE_MASK | DTO_MASK | CEN_MASK),
		(ICE_STOP | DTO_15THDTO));
	mmc_reg_out(&mmc_base->sysctl, ICE_MASK | CLKD_MASK,
		(dsor << CLKD_OFFSET) | ICE_OSCILLATE);
	start = get_timer(0);
	while ((readl(&mmc_base->sysctl) & ICS_MASK) == ICS_NOTREADY) {
		if (get_timer(0) - start > MAX_RETRY_MS) {
			printf("%s: timedout waiting for ics!\n", __func__);
			return -ETIMEDOUT;
		}
	}
	writel(readl(&mmc_base->sysctl) | CEN_ENABLE, &mmc_base->sysctl);

	writel(readl(&mmc_base->hctl) | SDBP_PWRON, &mmc_base->hctl);

	writel(IE_BADA | IE_CERR | IE_DEB | IE_DCRC | IE_DTO | IE_CIE |
		IE_CEB | IE_CCRC | IE_ADMAE | IE_CTO | IE_BRR | IE_BWR | IE_TC |
		IE_CC, &mmc_base->ie);

	mmc_init_stream(mmc_base);

	return 0;
}

/*
 * MMC controller internal finite state machine reset
 *
 * Used to reset command or data internal state machines, using respectively
 * SRC or SRD bit of SYSCTL register
 */
static void mmc_reset_controller_fsm(struct hsmmc *mmc_base, u32 bit)
{
	ulong start;

	mmc_reg_out(&mmc_base->sysctl, bit, bit);

	/*
	 * CMD(DAT) lines reset procedures are slightly different
	 * for OMAP3 and OMAP4(AM335x,OMAP5,DRA7xx).
	 * According to OMAP3 TRM:
	 * Set SRC(SRD) bit in MMCHS_SYSCTL register to 0x1 and wait until it
	 * returns to 0x0.
	 * According to OMAP4(AM335x,OMAP5,DRA7xx) TRMs, CMD(DATA) lines reset
	 * procedure steps must be as follows:
	 * 1. Initiate CMD(DAT) line reset by writing 0x1 to SRC(SRD) bit in
	 *    MMCHS_SYSCTL register (SD_SYSCTL for AM335x).
	 * 2. Poll the SRC(SRD) bit until it is set to 0x1.
	 * 3. Wait until the SRC (SRD) bit returns to 0x0
	 *    (reset procedure is completed).
	 */
#if defined(CONFIG_OMAP44XX) || defined(CONFIG_OMAP54XX) || \
	defined(CONFIG_AM33XX) || defined(CONFIG_AM43XX)
	if (!(readl(&mmc_base->sysctl) & bit)) {
		start = get_timer(0);
		while (!(readl(&mmc_base->sysctl) & bit)) {
			if (get_timer(0) - start > MAX_RETRY_MS)
				return;
		}
	}
#endif
	start = get_timer(0);
	while ((readl(&mmc_base->sysctl) & bit) != 0) {
		if (get_timer(0) - start > MAX_RETRY_MS) {
			printf("%s: timedout waiting for sysctl %x to clear\n",
				__func__, bit);
			return;
		}
	}
}

#ifndef CONFIG_OMAP34XX
static void omap_hsmmc_adma_desc(struct mmc *mmc, char *buf, u16 len, bool end)
{
	struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
	struct omap_hsmmc_adma_desc *desc;
	u8 attr;

	desc = &priv->adma_desc_table[priv->desc_slot];

	attr = ADMA_DESC_ATTR_VALID | ADMA_DESC_TRANSFER_DATA;
	if (!end)
		priv->desc_slot++;
	else
		attr |= ADMA_DESC_ATTR_END;

	desc->len = len;
	desc->addr = (u32)buf;
	desc->reserved = 0;
	desc->attr = attr;
}

static void omap_hsmmc_prepare_adma_table(struct mmc *mmc,
					  struct mmc_data *data)
{
	uint total_len = data->blocksize * data->blocks;
	uint desc_count = DIV_ROUND_UP(total_len, ADMA_MAX_LEN);
	struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
	int i = desc_count;
	char *buf;

	priv->desc_slot = 0;
	priv->adma_desc_table = (struct omap_hsmmc_adma_desc *)
				memalign(ARCH_DMA_MINALIGN, desc_count *
				sizeof(struct omap_hsmmc_adma_desc));

	if (data->flags & MMC_DATA_READ)
		buf = data->dest;
	else
		buf = (char *)data->src;

	while (--i) {
		omap_hsmmc_adma_desc(mmc, buf, ADMA_MAX_LEN, false);
		buf += ADMA_MAX_LEN;
		total_len -= ADMA_MAX_LEN;
	}

	omap_hsmmc_adma_desc(mmc, buf, total_len, true);

	flush_dcache_range((long)priv->adma_desc_table,
			   (long)priv->adma_desc_table +
			   ROUND(desc_count *
			   sizeof(struct omap_hsmmc_adma_desc),
			   ARCH_DMA_MINALIGN));
}

static void omap_hsmmc_prepare_data(struct mmc *mmc, struct mmc_data *data)
{
	struct hsmmc *mmc_base;
	struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
	u32 val;
	char *buf;

	mmc_base = priv->base_addr;
	omap_hsmmc_prepare_adma_table(mmc, data);

	if (data->flags & MMC_DATA_READ)
		buf = data->dest;
	else
		buf = (char *)data->src;

	val = readl(&mmc_base->hctl);
	val |= DMA_SELECT;
	writel(val, &mmc_base->hctl);

	val = readl(&mmc_base->con);
	val |= DMA_MASTER;
	writel(val, &mmc_base->con);

	writel((u32)priv->adma_desc_table, &mmc_base->admasal);

	flush_dcache_range((u32)buf,
			   (u32)buf +
			   ROUND(data->blocksize * data->blocks,
				 ARCH_DMA_MINALIGN));
}

static void omap_hsmmc_dma_cleanup(struct mmc *mmc)
{
	struct hsmmc *mmc_base;
	struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
	u32 val;

	mmc_base = priv->base_addr;

	val = readl(&mmc_base->con);
	val &= ~DMA_MASTER;
	writel(val, &mmc_base->con);

	val = readl(&mmc_base->hctl);
	val &= ~DMA_SELECT;
	writel(val, &mmc_base->hctl);

	kfree(priv->adma_desc_table);
}
#else
#define omap_hsmmc_adma_desc
#define omap_hsmmc_prepare_adma_table
#define omap_hsmmc_prepare_data
#define omap_hsmmc_dma_cleanup
#endif

#if !CONFIG_IS_ENABLED(DM_MMC)
static int omap_hsmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
			struct mmc_data *data)
{
	struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
#else
static int omap_hsmmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
			struct mmc_data *data)
{
	struct omap_hsmmc_data *priv = dev_get_priv(dev);
#ifndef CONFIG_OMAP34XX
	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
	struct mmc *mmc = upriv->mmc;
#endif
#endif
	struct hsmmc *mmc_base;
	unsigned int flags, mmc_stat;
	ulong start;

	mmc_base = priv->base_addr;

	if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
		return 0;

	start = get_timer(0);
	while ((readl(&mmc_base->pstate) & (DATI_MASK | CMDI_MASK)) != 0) {
		if (get_timer(0) - start > MAX_RETRY_MS) {
			printf("%s: timedout waiting on cmd inhibit to clear\n",
					__func__);
			return -ETIMEDOUT;
		}
	}
	writel(0xFFFFFFFF, &mmc_base->stat);
	start = get_timer(0);
	while (readl(&mmc_base->stat)) {
		if (get_timer(0) - start > MAX_RETRY_MS) {
			printf("%s: timedout waiting for STAT (%x) to clear\n",
				__func__, readl(&mmc_base->stat));
			return -ETIMEDOUT;
		}
	}
	/*
	 * CMDREG
	 * CMDIDX[13:8]	: Command index
	 * DATAPRNT[5]	: Data Present Select
	 * ENCMDIDX[4]	: Command Index Check Enable
	 * ENCMDCRC[3]	: Command CRC Check Enable
	 * RSPTYP[1:0]
	 *	00 = No Response
	 *	01 = Length 136
	 *	10 = Length 48
	 *	11 = Length 48 Check busy after response
	 */
	/* Delay added before checking the status of frq change
	 * retry not supported by mmc.c(core file)
	 */
	if (cmd->cmdidx == SD_CMD_APP_SEND_SCR)
		udelay(50000); /* wait 50 ms */

	if (!(cmd->resp_type & MMC_RSP_PRESENT))
		flags = 0;
	else if (cmd->resp_type & MMC_RSP_136)
		flags = RSP_TYPE_LGHT136 | CICE_NOCHECK;
	else if (cmd->resp_type & MMC_RSP_BUSY)
		flags = RSP_TYPE_LGHT48B;
	else
		flags = RSP_TYPE_LGHT48;

	/* enable default flags */
	flags =	flags | (CMD_TYPE_NORMAL | CICE_NOCHECK | CCCE_NOCHECK |
			MSBS_SGLEBLK);
	flags &= ~(ACEN_ENABLE | BCE_ENABLE | DE_ENABLE);

	if (cmd->resp_type & MMC_RSP_CRC)
		flags |= CCCE_CHECK;
	if (cmd->resp_type & MMC_RSP_OPCODE)
		flags |= CICE_CHECK;

	if (data) {
		if ((cmd->cmdidx == MMC_CMD_READ_MULTIPLE_BLOCK) ||
			 (cmd->cmdidx == MMC_CMD_WRITE_MULTIPLE_BLOCK)) {
			flags |= (MSBS_MULTIBLK | BCE_ENABLE | ACEN_ENABLE);
			data->blocksize = 512;
			writel(data->blocksize | (data->blocks << 16),
							&mmc_base->blk);
		} else
			writel(data->blocksize | NBLK_STPCNT, &mmc_base->blk);

		if (data->flags & MMC_DATA_READ)
			flags |= (DP_DATA | DDIR_READ);
		else
			flags |= (DP_DATA | DDIR_WRITE);

#ifndef CONFIG_OMAP34XX
		if ((priv->controller_flags & OMAP_HSMMC_USE_ADMA) &&
		    !mmc_is_tuning_cmd(cmd->cmdidx)) {
			omap_hsmmc_prepare_data(mmc, data);
			flags |= DE_ENABLE;
		}
#endif
	}

	writel(cmd->cmdarg, &mmc_base->arg);
	udelay(20);		/* To fix "No status update" error on eMMC */
	writel((cmd->cmdidx << 24) | flags, &mmc_base->cmd);

	start = get_timer(0);
	do {
		mmc_stat = readl(&mmc_base->stat);
		if (get_timer(start) > MAX_RETRY_MS) {
			printf("%s : timeout: No status update\n", __func__);
			return -ETIMEDOUT;
		}
	} while (!mmc_stat);

	if ((mmc_stat & IE_CTO) != 0) {
		mmc_reset_controller_fsm(mmc_base, SYSCTL_SRC);
		return -ETIMEDOUT;
	} else if ((mmc_stat & ERRI_MASK) != 0)
		return -1;

	if (mmc_stat & CC_MASK) {
		writel(CC_MASK, &mmc_base->stat);
		if (cmd->resp_type & MMC_RSP_PRESENT) {
			if (cmd->resp_type & MMC_RSP_136) {
				/* response type 2 */
				cmd->response[3] = readl(&mmc_base->rsp10);
				cmd->response[2] = readl(&mmc_base->rsp32);
				cmd->response[1] = readl(&mmc_base->rsp54);
				cmd->response[0] = readl(&mmc_base->rsp76);
			} else
				/* response types 1, 1b, 3, 4, 5, 6 */
				cmd->response[0] = readl(&mmc_base->rsp10);
		}
	}

#ifndef CONFIG_OMAP34XX
	if ((priv->controller_flags & OMAP_HSMMC_USE_ADMA) && data &&
	    !mmc_is_tuning_cmd(cmd->cmdidx)) {
		u32 sz_mb, timeout;

		if (mmc_stat & IE_ADMAE) {
			omap_hsmmc_dma_cleanup(mmc);
			return -EIO;
		}

		sz_mb = DIV_ROUND_UP(data->blocksize *  data->blocks, 1 << 20);
		timeout = sz_mb * DMA_TIMEOUT_PER_MB;
		if (timeout < MAX_RETRY_MS)
			timeout = MAX_RETRY_MS;

		start = get_timer(0);
		do {
			mmc_stat = readl(&mmc_base->stat);
			if (mmc_stat & TC_MASK) {
				writel(readl(&mmc_base->stat) | TC_MASK,
				       &mmc_base->stat);
				break;
			}
			if (get_timer(start) > timeout) {
				printf("%s : DMA timeout: No status update\n",
				       __func__);
				return -ETIMEDOUT;
			}
		} while (1);

		omap_hsmmc_dma_cleanup(mmc);
		return 0;
	}
#endif

	if (data && (data->flags & MMC_DATA_READ)) {
		mmc_read_data(mmc_base,	data->dest,
				data->blocksize * data->blocks);
	} else if (data && (data->flags & MMC_DATA_WRITE)) {
		mmc_write_data(mmc_base, data->src,
				data->blocksize * data->blocks);
	}
	return 0;
}

static int mmc_read_data(struct hsmmc *mmc_base, char *buf, unsigned int size)
{
	unsigned int *output_buf = (unsigned int *)buf;
	unsigned int mmc_stat;
	unsigned int count;

	/*
	 * Start Polled Read
	 */
	count = (size > MMCSD_SECTOR_SIZE) ? MMCSD_SECTOR_SIZE : size;
	count /= 4;

	while (size) {
		ulong start = get_timer(0);
		do {
			mmc_stat = readl(&mmc_base->stat);
			if (get_timer(0) - start > MAX_RETRY_MS) {
				printf("%s: timedout waiting for status!\n",
						__func__);
				return -ETIMEDOUT;
			}
		} while (mmc_stat == 0);

		if ((mmc_stat & (IE_DTO | IE_DCRC | IE_DEB)) != 0)
			mmc_reset_controller_fsm(mmc_base, SYSCTL_SRD);

		if ((mmc_stat & ERRI_MASK) != 0)
			return 1;

		if (mmc_stat & BRR_MASK) {
			unsigned int k;

			writel(readl(&mmc_base->stat) | BRR_MASK,
				&mmc_base->stat);
			for (k = 0; k < count; k++) {
				*output_buf = readl(&mmc_base->data);
				output_buf++;
			}
			size -= (count*4);
		}

		if (mmc_stat & BWR_MASK)
			writel(readl(&mmc_base->stat) | BWR_MASK,
				&mmc_base->stat);

		if (mmc_stat & TC_MASK) {
			writel(readl(&mmc_base->stat) | TC_MASK,
				&mmc_base->stat);
			break;
		}
	}
	return 0;
}

static int mmc_write_data(struct hsmmc *mmc_base, const char *buf,
				unsigned int size)
{
	unsigned int *input_buf = (unsigned int *)buf;
	unsigned int mmc_stat;
	unsigned int count;

	/*
	 * Start Polled Write
	 */
	count = (size > MMCSD_SECTOR_SIZE) ? MMCSD_SECTOR_SIZE : size;
	count /= 4;

	while (size) {
		ulong start = get_timer(0);
		do {
			mmc_stat = readl(&mmc_base->stat);
			if (get_timer(0) - start > MAX_RETRY_MS) {
				printf("%s: timedout waiting for status!\n",
						__func__);
				return -ETIMEDOUT;
			}
		} while (mmc_stat == 0);

		if ((mmc_stat & (IE_DTO | IE_DCRC | IE_DEB)) != 0)
			mmc_reset_controller_fsm(mmc_base, SYSCTL_SRD);

		if ((mmc_stat & ERRI_MASK) != 0)
			return 1;

		if (mmc_stat & BWR_MASK) {
			unsigned int k;

			writel(readl(&mmc_base->stat) | BWR_MASK,
					&mmc_base->stat);
			for (k = 0; k < count; k++) {
				writel(*input_buf, &mmc_base->data);
				input_buf++;
			}
			size -= (count*4);
		}

		if (mmc_stat & BRR_MASK)
			writel(readl(&mmc_base->stat) | BRR_MASK,
				&mmc_base->stat);

		if (mmc_stat & TC_MASK) {
			writel(readl(&mmc_base->stat) | TC_MASK,
				&mmc_base->stat);
			break;
		}
	}
	return 0;
}

static void omap_hsmmc_stop_clock(struct hsmmc *mmc_base)
{
	writel(readl(&mmc_base->sysctl) & ~CEN_ENABLE, &mmc_base->sysctl);
}

static void omap_hsmmc_start_clock(struct hsmmc *mmc_base)
{
	writel(readl(&mmc_base->sysctl) | CEN_ENABLE, &mmc_base->sysctl);
}

static void omap_hsmmc_set_clock(struct mmc *mmc)
{
	struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
	struct hsmmc *mmc_base;
	unsigned int dsor = 0;
	ulong start;

	mmc_base = priv->base_addr;
	omap_hsmmc_stop_clock(mmc_base);

	/* TODO: Is setting DTO required here? */
	mmc_reg_out(&mmc_base->sysctl, (ICE_MASK | DTO_MASK),
		    (ICE_STOP | DTO_15THDTO));

	if (mmc->clock != 0) {
		dsor = DIV_ROUND_UP(MMC_CLOCK_REFERENCE * 1000000, mmc->clock);
		if (dsor > CLKD_MAX)
			dsor = CLKD_MAX;
	} else {
		dsor = CLKD_MAX;
	}

	mmc_reg_out(&mmc_base->sysctl, ICE_MASK | CLKD_MASK,
		    (dsor << CLKD_OFFSET) | ICE_OSCILLATE);

	start = get_timer(0);
	while ((readl(&mmc_base->sysctl) & ICS_MASK) == ICS_NOTREADY) {
		if (get_timer(0) - start > MAX_RETRY_MS) {
			printf("%s: timedout waiting for ics!\n", __func__);
			return;
		}
	}

	priv->clock = mmc->clock;
	omap_hsmmc_start_clock(mmc_base);
}

static void omap_hsmmc_set_bus_width(struct mmc *mmc)
{
	struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
	struct hsmmc *mmc_base;

	mmc_base = priv->base_addr;
	/* configue bus width */
	switch (mmc->bus_width) {
	case 8:
		writel(readl(&mmc_base->con) | DTW_8_BITMODE,
			&mmc_base->con);
		break;

	case 4:
		writel(readl(&mmc_base->con) & ~DTW_8_BITMODE,
			&mmc_base->con);
		writel(readl(&mmc_base->hctl) | DTW_4_BITMODE,
			&mmc_base->hctl);
		break;

	case 1:
	default:
		writel(readl(&mmc_base->con) & ~DTW_8_BITMODE,
			&mmc_base->con);
		writel(readl(&mmc_base->hctl) & ~DTW_4_BITMODE,
			&mmc_base->hctl);
		break;
	}

	priv->bus_width = mmc->bus_width;
}

#if !CONFIG_IS_ENABLED(DM_MMC)
static int omap_hsmmc_set_ios(struct mmc *mmc)
{
	struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
#else
static int omap_hsmmc_set_ios(struct udevice *dev)
{
	struct omap_hsmmc_data *priv = dev_get_priv(dev);
	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
	struct mmc *mmc = upriv->mmc;
#endif

	if (priv->bus_width != mmc->bus_width)
		omap_hsmmc_set_bus_width(mmc);

	if (priv->clock != mmc->clock)
		omap_hsmmc_set_clock(mmc);

	return 0;
}

#ifdef OMAP_HSMMC_USE_GPIO
#if CONFIG_IS_ENABLED(DM_MMC)
static int omap_hsmmc_getcd(struct udevice *dev)
{
	struct omap_hsmmc_data *priv = dev_get_priv(dev);
	int value;

	value = dm_gpio_get_value(&priv->cd_gpio);
	/* if no CD return as 1 */
	if (value < 0)
		return 1;

	if (priv->cd_inverted)
		return !value;
	return value;
}

static int omap_hsmmc_getwp(struct udevice *dev)
{
	struct omap_hsmmc_data *priv = dev_get_priv(dev);
	int value;

	value = dm_gpio_get_value(&priv->wp_gpio);
	/* if no WP return as 0 */
	if (value < 0)
		return 0;
	return value;
}
#else
static int omap_hsmmc_getcd(struct mmc *mmc)
{
	struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
	int cd_gpio;

	/* if no CD return as 1 */
	cd_gpio = priv->cd_gpio;
	if (cd_gpio < 0)
		return 1;

	/* NOTE: assumes card detect signal is active-low */
	return !gpio_get_value(cd_gpio);
}

static int omap_hsmmc_getwp(struct mmc *mmc)
{
	struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
	int wp_gpio;

	/* if no WP return as 0 */
	wp_gpio = priv->wp_gpio;
	if (wp_gpio < 0)
		return 0;

	/* NOTE: assumes write protect signal is active-high */
	return gpio_get_value(wp_gpio);
}
#endif
#endif

#if CONFIG_IS_ENABLED(DM_MMC)
static const struct dm_mmc_ops omap_hsmmc_ops = {
	.send_cmd	= omap_hsmmc_send_cmd,
	.set_ios	= omap_hsmmc_set_ios,
#ifdef OMAP_HSMMC_USE_GPIO
	.get_cd		= omap_hsmmc_getcd,
	.get_wp		= omap_hsmmc_getwp,
#endif