Initial import

1 files changed, 2344 insertions, 0 deletions

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
new file mode 100644
index 000000000..9df2b6801
--- /dev/null
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -0,0 +1,2344 @@
+/*
+ * drivers/mmc/host/omap_hsmmc.c
+ *
+ * Driver for OMAP2430/3430 MMC controller.
+ *
+ * Copyright (C) 2007 Texas Instruments.
+ *
+ * Authors:
+ *	Syed Mohammed Khasim	<x0khasim@ti.com>
+ *	Madhusudhan		<madhu.cr@ti.com>
+ *	Mohit Jalori		<mjalori@ti.com>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/debugfs.h>
+#include <linux/dmaengine.h>
+#include <linux/seq_file.h>
+#include <linux/sizes.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/platform_device.h>
+#include <linux/timer.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_gpio.h>
+#include <linux/of_device.h>
+#include <linux/omap-dmaengine.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/core.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/slot-gpio.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/gpio.h>
+#include <linux/regulator/consumer.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pm_runtime.h>
+#include <linux/platform_data/hsmmc-omap.h>
+
+/* OMAP HSMMC Host Controller Registers */
+#define OMAP_HSMMC_SYSSTATUS	0x0014
+#define OMAP_HSMMC_CON		0x002C
+#define OMAP_HSMMC_SDMASA	0x0100
+#define OMAP_HSMMC_BLK		0x0104
+#define OMAP_HSMMC_ARG		0x0108
+#define OMAP_HSMMC_CMD		0x010C
+#define OMAP_HSMMC_RSP10	0x0110
+#define OMAP_HSMMC_RSP32	0x0114
+#define OMAP_HSMMC_RSP54	0x0118
+#define OMAP_HSMMC_RSP76	0x011C
+#define OMAP_HSMMC_DATA		0x0120
+#define OMAP_HSMMC_PSTATE	0x0124
+#define OMAP_HSMMC_HCTL		0x0128
+#define OMAP_HSMMC_SYSCTL	0x012C
+#define OMAP_HSMMC_STAT		0x0130
+#define OMAP_HSMMC_IE		0x0134
+#define OMAP_HSMMC_ISE		0x0138
+#define OMAP_HSMMC_AC12		0x013C
+#define OMAP_HSMMC_CAPA		0x0140
+
+#define VS18			(1 << 26)
+#define VS30			(1 << 25)
+#define HSS			(1 << 21)
+#define SDVS18			(0x5 << 9)
+#define SDVS30			(0x6 << 9)
+#define SDVS33			(0x7 << 9)
+#define SDVS_MASK		0x00000E00
+#define SDVSCLR			0xFFFFF1FF
+#define SDVSDET			0x00000400
+#define AUTOIDLE		0x1
+#define SDBP			(1 << 8)
+#define DTO			0xe
+#define ICE			0x1
+#define ICS			0x2
+#define CEN			(1 << 2)
+#define CLKD_MAX		0x3FF		/* max clock divisor: 1023 */
+#define CLKD_MASK		0x0000FFC0
+#define CLKD_SHIFT		6
+#define DTO_MASK		0x000F0000
+#define DTO_SHIFT		16
+#define INIT_STREAM		(1 << 1)
+#define ACEN_ACMD23		(2 << 2)
+#define DP_SELECT		(1 << 21)
+#define DDIR			(1 << 4)
+#define DMAE			0x1
+#define MSBS			(1 << 5)
+#define BCE			(1 << 1)
+#define FOUR_BIT		(1 << 1)
+#define HSPE			(1 << 2)
+#define IWE			(1 << 24)
+#define DDR			(1 << 19)
+#define CLKEXTFREE		(1 << 16)
+#define CTPL			(1 << 11)
+#define DW8			(1 << 5)
+#define OD			0x1
+#define STAT_CLEAR		0xFFFFFFFF
+#define INIT_STREAM_CMD		0x00000000
+#define DUAL_VOLT_OCR_BIT	7
+#define SRC			(1 << 25)
+#define SRD			(1 << 26)
+#define SOFTRESET		(1 << 1)
+
+/* PSTATE */
+#define DLEV_DAT(x)		(1 << (20 + (x)))
+
+/* Interrupt masks for IE and ISE register */
+#define CC_EN			(1 << 0)
+#define TC_EN			(1 << 1)
+#define BWR_EN			(1 << 4)
+#define BRR_EN			(1 << 5)
+#define CIRQ_EN			(1 << 8)
+#define ERR_EN			(1 << 15)
+#define CTO_EN			(1 << 16)
+#define CCRC_EN			(1 << 17)
+#define CEB_EN			(1 << 18)
+#define CIE_EN			(1 << 19)
+#define DTO_EN			(1 << 20)
+#define DCRC_EN			(1 << 21)
+#define DEB_EN			(1 << 22)
+#define ACE_EN			(1 << 24)
+#define CERR_EN			(1 << 28)
+#define BADA_EN			(1 << 29)
+
+#define INT_EN_MASK (BADA_EN | CERR_EN | ACE_EN | DEB_EN | DCRC_EN |\
+		DTO_EN | CIE_EN | CEB_EN | CCRC_EN | CTO_EN | \
+		BRR_EN | BWR_EN | TC_EN | CC_EN)
+
+#define CNI	(1 << 7)
+#define ACIE	(1 << 4)
+#define ACEB	(1 << 3)
+#define ACCE	(1 << 2)
+#define ACTO	(1 << 1)
+#define ACNE	(1 << 0)
+
+#define MMC_AUTOSUSPEND_DELAY	100
+#define MMC_TIMEOUT_MS		20		/* 20 mSec */
+#define MMC_TIMEOUT_US		20000		/* 20000 micro Sec */
+#define OMAP_MMC_MIN_CLOCK	400000
+#define OMAP_MMC_MAX_CLOCK	52000000
+#define DRIVER_NAME		"omap_hsmmc"
+
+#define VDD_1V8			1800000		/* 180000 uV */
+#define VDD_3V0			3000000		/* 300000 uV */
+#define VDD_165_195		(ffs(MMC_VDD_165_195) - 1)
+
+/*
+ * One controller can have multiple slots, like on some omap boards using
+ * omap.c controller driver. Luckily this is not currently done on any known
+ * omap_hsmmc.c device.
+ */
+#define mmc_pdata(host)		host->pdata
+
+/*
+ * MMC Host controller read/write API's
+ */
+#define OMAP_HSMMC_READ(base, reg)	\
+	__raw_readl((base) + OMAP_HSMMC_##reg)
+
+#define OMAP_HSMMC_WRITE(base, reg, val) \
+	__raw_writel((val), (base) + OMAP_HSMMC_##reg)
+
+struct omap_hsmmc_next {
+	unsigned int	dma_len;
+	s32		cookie;
+};
+
+struct omap_hsmmc_host {
+	struct	device		*dev;
+	struct	mmc_host	*mmc;
+	struct	mmc_request	*mrq;
+	struct	mmc_command	*cmd;
+	struct	mmc_data	*data;
+	struct	clk		*fclk;
+	struct	clk		*dbclk;
+	/*
+	 * vcc == configured supply
+	 * vcc_aux == optional
+	 *   -	MMC1, supply for DAT4..DAT7
+	 *   -	MMC2/MMC2, external level shifter voltage supply, for
+	 *	chip (SDIO, eMMC, etc) or transceiver (MMC2 only)
+	 */
+	struct	regulator	*vcc;
+	struct	regulator	*vcc_aux;
+	struct	regulator	*pbias;
+	bool			pbias_enabled;
+	void	__iomem		*base;
+	resource_size_t		mapbase;
+	spinlock_t		irq_lock; /* Prevent races with irq handler */
+	unsigned int		dma_len;
+	unsigned int		dma_sg_idx;
+	unsigned char		bus_mode;
+	unsigned char		power_mode;
+	int			suspended;
+	u32			con;
+	u32			hctl;
+	u32			sysctl;
+	u32			capa;
+	int			irq;
+	int			wake_irq;
+	int			use_dma, dma_ch;
+	struct dma_chan		*tx_chan;
+	struct dma_chan		*rx_chan;
+	int			response_busy;
+	int			context_loss;
+	int			protect_card;
+	int			reqs_blocked;
+	int			use_reg;
+	int			req_in_progress;
+	unsigned long		clk_rate;
+	unsigned int		flags;
+#define AUTO_CMD23		(1 << 0)        /* Auto CMD23 support */
+#define HSMMC_SDIO_IRQ_ENABLED	(1 << 1)        /* SDIO irq enabled */
+#define HSMMC_WAKE_IRQ_ENABLED	(1 << 2)
+	struct omap_hsmmc_next	next_data;
+	struct	omap_hsmmc_platform_data	*pdata;
+
+	/* return MMC cover switch state, can be NULL if not supported.
+	 *
+	 * possible return values:
+	 *   0 - closed
+	 *   1 - open
+	 */
+	int (*get_cover_state)(struct device *dev);
+
+	int (*card_detect)(struct device *dev);
+};
+
+struct omap_mmc_of_data {
+	u32 reg_offset;
+	u8 controller_flags;
+};
+
+static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host);
+
+static int omap_hsmmc_card_detect(struct device *dev)
+{
+	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
+
+	return mmc_gpio_get_cd(host->mmc);
+}
+
+static int omap_hsmmc_get_cover_state(struct device *dev)
+{
+	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
+
+	return mmc_gpio_get_cd(host->mmc);
+}
+
+#ifdef CONFIG_REGULATOR
+
+static int omap_hsmmc_set_power(struct device *dev, int power_on, int vdd)
+{
+	struct omap_hsmmc_host *host =
+		platform_get_drvdata(to_platform_device(dev));
+	int ret = 0;
+
+	/*
+	 * If we don't see a Vcc regulator, assume it's a fixed
+	 * voltage always-on regulator.
+	 */
+	if (!host->vcc)
+		return 0;
+
+	if (mmc_pdata(host)->before_set_reg)
+		mmc_pdata(host)->before_set_reg(dev, power_on, vdd);
+
+	if (host->pbias) {
+		if (host->pbias_enabled == 1) {
+			ret = regulator_disable(host->pbias);
+			if (!ret)
+				host->pbias_enabled = 0;
+		}
+		regulator_set_voltage(host->pbias, VDD_3V0, VDD_3V0);
+	}
+
+	/*
+	 * Assume Vcc regulator is used only to power the card ... OMAP
+	 * VDDS is used to power the pins, optionally with a transceiver to
+	 * support cards using voltages other than VDDS (1.8V nominal).  When a
+	 * transceiver is used, DAT3..7 are muxed as transceiver control pins.
+	 *
+	 * In some cases this regulator won't support enable/disable;
+	 * e.g. it's a fixed rail for a WLAN chip.
+	 *
+	 * In other cases vcc_aux switches interface power.  Example, for
+	 * eMMC cards it represents VccQ.  Sometimes transceivers or SDIO
+	 * chips/cards need an interface voltage rail too.
+	 */
+	if (power_on) {
+		if (host->vcc)
+			ret = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd);
+		/* Enable interface voltage rail, if needed */
+		if (ret == 0 && host->vcc_aux) {
+			ret = regulator_enable(host->vcc_aux);
+			if (ret < 0 && host->vcc)
+				ret = mmc_regulator_set_ocr(host->mmc,
+							host->vcc, 0);
+		}
+	} else {
+		/* Shut down the rail */
+		if (host->vcc_aux)
+			ret = regulator_disable(host->vcc_aux);
+		if (host->vcc) {
+			/* Then proceed to shut down the local regulator */
+			ret = mmc_regulator_set_ocr(host->mmc,
+						host->vcc, 0);
+		}
+	}
+
+	if (host->pbias) {
+		if (vdd <= VDD_165_195)
+			ret = regulator_set_voltage(host->pbias, VDD_1V8,
+								VDD_1V8);
+		else
+			ret = regulator_set_voltage(host->pbias, VDD_3V0,
+								VDD_3V0);
+		if (ret < 0)
+			goto error_set_power;
+
+		if (host->pbias_enabled == 0) {
+			ret = regulator_enable(host->pbias);
+			if (!ret)
+				host->pbias_enabled = 1;
+		}
+	}
+
+	if (mmc_pdata(host)->after_set_reg)
+		mmc_pdata(host)->after_set_reg(dev, power_on, vdd);
+
+error_set_power:
+	return ret;
+}
+
+static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
+{
+	struct regulator *reg;
+	int ocr_value = 0;
+
+	reg = devm_regulator_get(host->dev, "vmmc");
+	if (IS_ERR(reg)) {
+		dev_err(host->dev, "unable to get vmmc regulator %ld\n",
+			PTR_ERR(reg));
+		return PTR_ERR(reg);
+	} else {
+		host->vcc = reg;
+		ocr_value = mmc_regulator_get_ocrmask(reg);
+		if (!mmc_pdata(host)->ocr_mask) {
+			mmc_pdata(host)->ocr_mask = ocr_value;
+		} else {
+			if (!(mmc_pdata(host)->ocr_mask & ocr_value)) {
+				dev_err(host->dev, "ocrmask %x is not supported\n",
+					mmc_pdata(host)->ocr_mask);
+				mmc_pdata(host)->ocr_mask = 0;
+				return -EINVAL;
+			}
+		}
+	}
+	mmc_pdata(host)->set_power = omap_hsmmc_set_power;
+
+	/* Allow an aux regulator */
+	reg = devm_regulator_get_optional(host->dev, "vmmc_aux");
+	host->vcc_aux = IS_ERR(reg) ? NULL : reg;
+
+	reg = devm_regulator_get_optional(host->dev, "pbias");
+	host->pbias = IS_ERR(reg) ? NULL : reg;
+
+	/* For eMMC do not power off when not in sleep state */
+	if (mmc_pdata(host)->no_regulator_off_init)
+		return 0;
+	/*
+	 * To disable boot_on regulator, enable regulator
+	 * to increase usecount and then disable it.
+	 */
+	if ((host->vcc && regulator_is_enabled(host->vcc) > 0) ||
+	    (host->vcc_aux && regulator_is_enabled(host->vcc_aux))) {
+		int vdd = ffs(mmc_pdata(host)->ocr_mask) - 1;
+
+		mmc_pdata(host)->set_power(host->dev, 1, vdd);
+		mmc_pdata(host)->set_power(host->dev, 0, 0);
+	}
+
+	return 0;
+}
+
+static void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
+{
+	mmc_pdata(host)->set_power = NULL;
+}
+
+static inline int omap_hsmmc_have_reg(void)
+{
+	return 1;
+}
+
+#else
+
+static inline int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
+{
+	return -EINVAL;
+}
+
+static inline void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
+{
+}
+
+static inline int omap_hsmmc_have_reg(void)
+{
+	return 0;
+}
+
+#endif
+
+static irqreturn_t omap_hsmmc_cover_irq(int irq, void *dev_id);
+
+static int omap_hsmmc_gpio_init(struct mmc_host *mmc,
+				struct omap_hsmmc_host *host,
+				struct omap_hsmmc_platform_data *pdata)
+{
+	int ret;
+
+	if (gpio_is_valid(pdata->gpio_cod)) {
+		ret = mmc_gpio_request_cd(mmc, pdata->gpio_cod, 0);
+		if (ret)
+			return ret;
+
+		host->get_cover_state = omap_hsmmc_get_cover_state;
+		mmc_gpio_set_cd_isr(mmc, omap_hsmmc_cover_irq);
+	} else if (gpio_is_valid(pdata->gpio_cd)) {
+		ret = mmc_gpio_request_cd(mmc, pdata->gpio_cd, 0);
+		if (ret)
+			return ret;
+
+		host->card_detect = omap_hsmmc_card_detect;
+	}
+
+	if (gpio_is_valid(pdata->gpio_wp)) {
+		ret = mmc_gpio_request_ro(mmc, pdata->gpio_wp);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+/*
+ * Start clock to the card
+ */
+static void omap_hsmmc_start_clock(struct omap_hsmmc_host *host)
+{
+	OMAP_HSMMC_WRITE(host->base, SYSCTL,
+		OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
+}
+
+/*
+ * Stop clock to the card
+ */
+static void omap_hsmmc_stop_clock(struct omap_hsmmc_host *host)
+{
+	OMAP_HSMMC_WRITE(host->base, SYSCTL,
+		OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
+	if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0)
+		dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stopped\n");
+}
+
+static void omap_hsmmc_enable_irq(struct omap_hsmmc_host *host,
+				  struct mmc_command *cmd)
+{
+	u32 irq_mask = INT_EN_MASK;
+	unsigned long flags;
+
+	if (host->use_dma)
+		irq_mask &= ~(BRR_EN | BWR_EN);
+
+	/* Disable timeout for erases */
+	if (cmd->opcode == MMC_ERASE)
+		irq_mask &= ~DTO_EN;
+
+	spin_lock_irqsave(&host->irq_lock, flags);
+	OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
+	OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
+
+	/* latch pending CIRQ, but don't signal MMC core */
+	if (host->flags & HSMMC_SDIO_IRQ_ENABLED)
+		irq_mask |= CIRQ_EN;
+	OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
+	spin_unlock_irqrestore(&host->irq_lock, flags);
+}
+
+static void omap_hsmmc_disable_irq(struct omap_hsmmc_host *host)
+{
+	u32 irq_mask = 0;
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->irq_lock, flags);
+	/* no transfer running but need to keep cirq if enabled */
+	if (host->flags & HSMMC_SDIO_IRQ_ENABLED)
+		irq_mask |= CIRQ_EN;
+	OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
+	OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
+	OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
+	spin_unlock_irqrestore(&host->irq_lock, flags);
+}
+
+/* Calculate divisor for the given clock frequency */
+static u16 calc_divisor(struct omap_hsmmc_host *host, struct mmc_ios *ios)
+{
+	u16 dsor = 0;
+
+	if (ios->clock) {
+		dsor = DIV_ROUND_UP(clk_get_rate(host->fclk), ios->clock);
+		if (dsor > CLKD_MAX)
+			dsor = CLKD_MAX;
+	}
+
+	return dsor;
+}
+
+static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host)
+{
+	struct mmc_ios *ios = &host->mmc->ios;
+	unsigned long regval;
+	unsigned long timeout;
+	unsigned long clkdiv;
+
+	dev_vdbg(mmc_dev(host->mmc), "Set clock to %uHz\n", ios->clock);
+
+	omap_hsmmc_stop_clock(host);
+
+	regval = OMAP_HSMMC_READ(host->base, SYSCTL);
+	regval = regval & ~(CLKD_MASK | DTO_MASK);
+	clkdiv = calc_divisor(host, ios);
+	regval = regval | (clkdiv << 6) | (DTO << 16);
+	OMAP_HSMMC_WRITE(host->base, SYSCTL, regval);
+	OMAP_HSMMC_WRITE(host->base, SYSCTL,
+		OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
+
+	/* Wait till the ICS bit is set */
+	timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
+	while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != ICS
+		&& time_before(jiffies, timeout))
+		cpu_relax();
+
+	/*
+	 * Enable High-Speed Support
+	 * Pre-Requisites
+	 *	- Controller should support High-Speed-Enable Bit
+	 *	- Controller should not be using DDR Mode
+	 *	- Controller should advertise that it supports High Speed
+	 *	  in capabilities register
+	 *	- MMC/SD clock coming out of controller > 25MHz
+	 */
+	if ((mmc_pdata(host)->features & HSMMC_HAS_HSPE_SUPPORT) &&
+	    (ios->timing != MMC_TIMING_MMC_DDR52) &&
+	    (ios->timing != MMC_TIMING_UHS_DDR50) &&
+	    ((OMAP_HSMMC_READ(host->base, CAPA) & HSS) == HSS)) {
+		regval = OMAP_HSMMC_READ(host->base, HCTL);
+		if (clkdiv && (clk_get_rate(host->fclk)/clkdiv) > 25000000)
+			regval |= HSPE;
+		else
+			regval &= ~HSPE;
+
+		OMAP_HSMMC_WRITE(host->base, HCTL, regval);
+	}
+
+	omap_hsmmc_start_clock(host);
+}
+
+static void omap_hsmmc_set_bus_width(struct omap_hsmmc_host *host)
+{
+	struct mmc_ios *ios = &host->mmc->ios;
+	u32 con;
+
+	con = OMAP_HSMMC_READ(host->base, CON);
+	if (ios->timing == MMC_TIMING_MMC_DDR52 ||
+	    ios->timing == MMC_TIMING_UHS_DDR50)
+		con |= DDR;	/* configure in DDR mode */
+	else
+		con &= ~DDR;
+	switch (ios->bus_width) {
+	case MMC_BUS_WIDTH_8:
+		OMAP_HSMMC_WRITE(host->base, CON, con | DW8);
+		break;
+	case MMC_BUS_WIDTH_4:
+		OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
+		OMAP_HSMMC_WRITE(host->base, HCTL,
+			OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
+		break;
+	case MMC_BUS_WIDTH_1:
+		OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
+		OMAP_HSMMC_WRITE(host->base, HCTL,
+			OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
+		break;
+	}
+}
+
+static void omap_hsmmc_set_bus_mode(struct omap_hsmmc_host *host)
+{
+	struct mmc_ios *ios = &host->mmc->ios;
+	u32 con;
+
+	con = OMAP_HSMMC_READ(host->base, CON);
+	if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
+		OMAP_HSMMC_WRITE(host->base, CON, con | OD);
+	else
+		OMAP_HSMMC_WRITE(host->base, CON, con & ~OD);
+}
+
+#ifdef CONFIG_PM
+
+/*
+ * Restore the MMC host context, if it was lost as result of a
+ * power state change.
+ */
+static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
+{
+	struct mmc_ios *ios = &host->mmc->ios;
+	u32 hctl, capa;
+	unsigned long timeout;
+
+	if (host->con == OMAP_HSMMC_READ(host->base, CON) &&
+	    host->hctl == OMAP_HSMMC_READ(host->base, HCTL) &&
+	    host->sysctl == OMAP_HSMMC_READ(host->base, SYSCTL) &&
+	    host->capa == OMAP_HSMMC_READ(host->base, CAPA))
+		return 0;
+
+	host->context_loss++;
+
+	if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
+		if (host->power_mode != MMC_POWER_OFF &&
+		    (1 << ios->vdd) <= MMC_VDD_23_24)
+			hctl = SDVS18;
+		else
+			hctl = SDVS30;
+		capa = VS30 | VS18;
+	} else {
+		hctl = SDVS18;
+		capa = VS18;
+	}
+
+	if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
+		hctl |= IWE;
+
+	OMAP_HSMMC_WRITE(host->base, HCTL,
+			OMAP_HSMMC_READ(host->base, HCTL) | hctl);
+
+	OMAP_HSMMC_WRITE(host->base, CAPA,
+			OMAP_HSMMC_READ(host->base, CAPA) | capa);
+
+	OMAP_HSMMC_WRITE(host->base, HCTL,
+			OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
+
+	timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
+	while ((OMAP_HSMMC_READ(host->base, HCTL) & SDBP) != SDBP
+		&& time_before(jiffies, timeout))
+		;
+
+	OMAP_HSMMC_WRITE(host->base, ISE, 0);
+	OMAP_HSMMC_WRITE(host->base, IE, 0);
+	OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
+
+	/* Do not initialize card-specific things if the power is off */
+	if (host->power_mode == MMC_POWER_OFF)
+		goto out;
+
+	omap_hsmmc_set_bus_width(host);
+
+	omap_hsmmc_set_clock(host);
+
+	omap_hsmmc_set_bus_mode(host);
+
+out:
+	dev_dbg(mmc_dev(host->mmc), "context is restored: restore count %d\n",
+		host->context_loss);
+	return 0;
+}
+
+/*
+ * Save the MMC host context (store the number of power state changes so far).
+ */
+static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
+{
+	host->con =  OMAP_HSMMC_READ(host->base, CON);
+	host->hctl = OMAP_HSMMC_READ(host->base, HCTL);
+	host->sysctl =  OMAP_HSMMC_READ(host->base, SYSCTL);
+	host->capa = OMAP_HSMMC_READ(host->base, CAPA);
+}
+
+#else
+
+static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
+{
+	return 0;
+}
+
+static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
+{
+}
+
+#endif
+
+/*
+ * Send init stream sequence to card
+ * before sending IDLE command
+ */
+static void send_init_stream(struct omap_hsmmc_host *host)
+{
+	int reg = 0;
+	unsigned long timeout;
+
+	if (host->protect_card)
+		return;
+
+	disable_irq(host->irq);
+
+	OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
+	OMAP_HSMMC_WRITE(host->base, CON,
+		OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM);
+	OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD);
+
+	timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
+	while ((reg != CC_EN) && time_before(jiffies, timeout))
+		reg = OMAP_HSMMC_READ(host->base, STAT) & CC_EN;
+
+	OMAP_HSMMC_WRITE(host->base, CON,
+		OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM);
+
+	OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
+	OMAP_HSMMC_READ(host->base, STAT);
+
+	enable_irq(host->irq);
+}
+
+static inline
+int omap_hsmmc_cover_is_closed(struct omap_hsmmc_host *host)
+{
+	int r = 1;
+
+	if (host->get_cover_state)
+		r = host->get_cover_state(host->dev);
+	return r;
+}
+
+static ssize_t
+omap_hsmmc_show_cover_switch(struct device *dev, struct device_attribute *attr,
+			   char *buf)
+{
+	struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
+	struct omap_hsmmc_host *host = mmc_priv(mmc);
+
+	return sprintf(buf, "%s\n",
+			omap_hsmmc_cover_is_closed(host) ? "closed" : "open");
+}
+
+static DEVICE_ATTR(cover_switch, S_IRUGO, omap_hsmmc_show_cover_switch, NULL);
+
+static ssize_t
+omap_hsmmc_show_slot_name(struct device *dev, struct device_attribute *attr,
+			char *buf)
+{
+	struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
+	struct omap_hsmmc_host *host = mmc_priv(mmc);
+
+	return sprintf(buf, "%s\n", mmc_pdata(host)->name);
+}
+
+static DEVICE_ATTR(slot_name, S_IRUGO, omap_hsmmc_show_slot_name, NULL);
+
+/*
+ * Configure the response type and send the cmd.
+ */
+static void
+omap_hsmmc_start_command(struct omap_hsmmc_host *host, struct mmc_command *cmd,
+	struct mmc_data *data)
+{
+	int cmdreg = 0, resptype = 0, cmdtype = 0;
+
+	dev_vdbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n",
+		mmc_hostname(host->mmc), cmd->opcode, cmd->arg);
+	host->cmd = cmd;
+
+	omap_hsmmc_enable_irq(host, cmd);
+
+	host->response_busy = 0;
+	if (cmd->flags & MMC_RSP_PRESENT) {
+		if (cmd->flags & MMC_RSP_136)
+			resptype = 1;
+		else if (cmd->flags & MMC_RSP_BUSY) {
+			resptype = 3;
+			host->response_busy = 1;
+		} else
+			resptype = 2;
+	}
+
+	/*
+	 * Unlike OMAP1 controller, the cmdtype does not seem to be based on
+	 * ac, bc, adtc, bcr. Only commands ending an open ended transfer need
+	 * a val of 0x3, rest 0x0.
+	 */
+	if (cmd == host->mrq->stop)
+		cmdtype = 0x3;
+
+	cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22);
+
+	if ((host->flags & AUTO_CMD23) && mmc_op_multi(cmd->opcode) &&
+	    host->mrq->sbc) {
+		cmdreg |= ACEN_ACMD23;
+		OMAP_HSMMC_WRITE(host->base, SDMASA, host->mrq->sbc->arg);
+	}
+	if (data) {
+		cmdreg |= DP_SELECT | MSBS | BCE;
+		if (data->flags & MMC_DATA_READ)
+			cmdreg |= DDIR;
+		else
+			cmdreg &= ~(DDIR);
+	}
+
+	if (host->use_dma)
+		cmdreg |= DMAE;
+
+	host->req_in_progress = 1;
+
+	OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
+	OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
+}
+
+static int
+omap_hsmmc_get_dma_dir(struct omap_hsmmc_host *host, struct mmc_data *data)
+{
+	if (data->flags & MMC_DATA_WRITE)
+		return DMA_TO_DEVICE;
+	else
+		return DMA_FROM_DEVICE;
+}
+
+static struct dma_chan *omap_hsmmc_get_dma_chan(struct omap_hsmmc_host *host,
+	struct mmc_data *data)
+{
+	return data->flags & MMC_DATA_WRITE ? host->tx_chan : host->rx_chan;
+}
+
+static void omap_hsmmc_request_done(struct omap_hsmmc_host *host, struct mmc_request *mrq)
+{
+	int dma_ch;
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->irq_lock, flags);
+	host->req_in_progress = 0;
+	dma_ch = host->dma_ch;
+	spin_unlock_irqrestore(&host->irq_lock, flags);
+
+	omap_hsmmc_disable_irq(host);
+	/* Do not complete the request if DMA is still in progress */
+	if (mrq->data && host->use_dma && dma_ch != -1)
+		return;
+	host->mrq = NULL;
+	mmc_request_done(host->mmc, mrq);
+	pm_runtime_mark_last_busy(host->dev);
+	pm_runtime_put_autosuspend(host->dev);
+}
+
+/*
+ * Notify the transfer complete to MMC core
+ */
+static void
+omap_hsmmc_xfer_done(struct omap_hsmmc_host *host, struct mmc_data *data)
+{
+	if (!data) {
+		struct mmc_request *mrq = host->mrq;
+
+		/* TC before CC from CMD6 - don't know why, but it happens */
+		if (host->cmd && host->cmd->opcode == 6 &&
+		    host->response_busy) {
+			host->response_busy = 0;
+			return;
+		}
+
+		omap_hsmmc_request_done(host, mrq);
+		return;
+	}
+
+	host->data = NULL;
+
+	if (!data->error)
+		data->bytes_xfered += data->blocks * (data->blksz);
+	else
+		data->bytes_xfered = 0;
+
+	if (data->stop && (data->error || !host->mrq->sbc))
+		omap_hsmmc_start_command(host, data->stop, NULL);
+	else
+		omap_hsmmc_request_done(host, data->mrq);
+}
+
+/*
+ * Notify the core about command completion
+ */
+static void
+omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct mmc_command *cmd)
+{
+	if (host->mrq->sbc && (host->cmd == host->mrq->sbc) &&
+	    !host->mrq->sbc->error && !(host->flags & AUTO_CMD23)) {
+		host->cmd = NULL;
+		omap_hsmmc_start_dma_transfer(host);
+		omap_hsmmc_start_command(host, host->mrq->cmd,
+						host->mrq->data);
+		return;
+	}
+
+	host->cmd = NULL;
+
+	if (cmd->flags & MMC_RSP_PRESENT) {
+		if (cmd->flags & MMC_RSP_136) {
+			/* response type 2 */
+			cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10);
+			cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32);
+			cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54);
+			cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76);
+		} else {
+			/* response types 1, 1b, 3, 4, 5, 6 */
+			cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
+		}
+	}
+	if ((host->data == NULL && !host->response_busy) || cmd->error)
+		omap_hsmmc_request_done(host, host->mrq);
+}
+
+/*
+ * DMA clean up for command errors
+ */
+static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno)
+{
+	int dma_ch;
+	unsigned long flags;
+
+	host->data->error = errno;
+
+	spin_lock_irqsave(&host->irq_lock, flags);
+	dma_ch = host->dma_ch;
+	host->dma_ch = -1;
+	spin_unlock_irqrestore(&host->irq_lock, flags);
+
+	if (host->use_dma && dma_ch != -1) {
+		struct dma_chan *chan = omap_hsmmc_get_dma_chan(host, host->data);
+
+		dmaengine_terminate_all(chan);
+		dma_unmap_sg(chan->device->dev,
+			host->data->sg, host->data->sg_len,
+			omap_hsmmc_get_dma_dir(host, host->data));
+
+		host->data->host_cookie = 0;
+	}
+	host->data = NULL;
+}
+
+/*
+ * Readable error output
+ */
+#ifdef CONFIG_MMC_DEBUG
+static void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host, u32 status)
+{
+	/* --- means reserved bit without definition at documentation */
+	static const char *omap_hsmmc_status_bits[] = {
+		"CC"  , "TC"  , "BGE", "---", "BWR" , "BRR" , "---" , "---" ,
+		"CIRQ",	"OBI" , "---", "---", "---" , "---" , "---" , "ERRI",
+		"CTO" , "CCRC", "CEB", "CIE", "DTO" , "DCRC", "DEB" , "---" ,
+		"ACE" , "---" , "---", "---", "CERR", "BADA", "---" , "---"
+	};
+	char res[256];
+	char *buf = res;
+	int len, i;
+
+	len = sprintf(buf, "MMC IRQ 0x%x :", status);
+	buf += len;
+
+	for (i = 0; i < ARRAY_SIZE(omap_hsmmc_status_bits); i++)
+		if (status & (1 << i)) {
+			len = sprintf(buf, " %s", omap_hsmmc_status_bits[i]);
+			buf += len;
+		}
+
+	dev_vdbg(mmc_dev(host->mmc), "%s\n", res);
+}
+#else
+static inline void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host,
+					     u32 status)
+{
+}
+#endif  /* CONFIG_MMC_DEBUG */
+
+/*
+ * MMC controller internal state machines reset
+ *
+ * Used to reset command or data internal state machines, using respectively
+ *  SRC or SRD bit of SYSCTL register
+ * Can be called from interrupt context
+ */
+static inline void omap_hsmmc_reset_controller_fsm(struct omap_hsmmc_host *host,
+						   unsigned long bit)
+{
+	unsigned long i = 0;
+	unsigned long limit = MMC_TIMEOUT_US;
+
+	OMAP_HSMMC_WRITE(host->base, SYSCTL,
+			 OMAP_HSMMC_READ(host->base, SYSCTL) | bit);
+
+	/*
+	 * OMAP4 ES2 and greater has an updated reset logic.
+	 * Monitor a 0->1 transition first
+	 */
+	if (mmc_pdata(host)->features & HSMMC_HAS_UPDATED_RESET) {
+		while ((!(OMAP_HSMMC_READ(host->base, SYSCTL) & bit))
+					&& (i++ < limit))
+			udelay(1);
+	}
+	i = 0;
+
+	while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) &&
+		(i++ < limit))
+		udelay(1);
+
+	if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit)
+		dev_err(mmc_dev(host->mmc),
+			"Timeout waiting on controller reset in %s\n",
+			__func__);
+}
+
+static void hsmmc_command_incomplete(struct omap_hsmmc_host *host,
+					int err, int end_cmd)
+{
+	if (end_cmd) {
+		omap_hsmmc_reset_controller_fsm(host, SRC);
+		if (host->cmd)
+			host->cmd->error = err;
+	}
+
+	if (host->data) {
+		omap_hsmmc_reset_controller_fsm(host, SRD);
+		omap_hsmmc_dma_cleanup(host, err);
+	} else if (host->mrq && host->mrq->cmd)
+		host->mrq->cmd->error = err;
+}
+
+static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host, int status)
+{
+	struct mmc_data *data;
+	int end_cmd = 0, end_trans = 0;
+	int error = 0;
+
+	data = host->data;
+	dev_vdbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
+
+	if (status & ERR_EN) {
+		omap_hsmmc_dbg_report_irq(host, status);
+
+		if (status & (CTO_EN | CCRC_EN))
+			end_cmd = 1;
+		if (status & (CTO_EN | DTO_EN))
+			hsmmc_command_incomplete(host, -ETIMEDOUT, end_cmd);
+		else if (status & (CCRC_EN | DCRC_EN))
+			hsmmc_command_incomplete(host, -EILSEQ, end_cmd);
+
+		if (status & ACE_EN) {
+			u32 ac12;
+			ac12 = OMAP_HSMMC_READ(host->base, AC12);
+			if (!(ac12 & ACNE) && host->mrq->sbc) {
+				end_cmd = 1;
+				if (ac12 & ACTO)
+					error =  -ETIMEDOUT;
+				else if (ac12 & (ACCE | ACEB | ACIE))
+					error = -EILSEQ;
+				host->mrq->sbc->error = error;
+				hsmmc_command_incomplete(host, error, end_cmd);
+			}
+			dev_dbg(mmc_dev(host->mmc), "AC12 err: 0x%x\n", ac12);
+		}
+		if (host->data || host->response_busy) {
+			end_trans = !end_cmd;
+			host->response_busy = 0;
+		}
+	}
+
+	OMAP_HSMMC_WRITE(host->base, STAT, status);
+	if (end_cmd || ((status & CC_EN) && host->cmd))
+		omap_hsmmc_cmd_done(host, host->cmd);
+	if ((end_trans || (status & TC_EN)) && host->mrq)
+		omap_hsmmc_xfer_done(host, data);
+}
+
+/*
+ * MMC controller IRQ handler
+ */
+static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id)
+{
+	struct omap_hsmmc_host *host = dev_id;
+	int status;
+
+	status = OMAP_HSMMC_READ(host->base, STAT);
+	while (status & (INT_EN_MASK | CIRQ_EN)) {
+		if (host->req_in_progress)
+			omap_hsmmc_do_irq(host, status);
+
+		if (status & CIRQ_EN)
+			mmc_signal_sdio_irq(host->mmc);
+
+		/* Flush posted write */
+		status = OMAP_HSMMC_READ(host->base, STAT);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t omap_hsmmc_wake_irq(int irq, void *dev_id)
+{
+	struct omap_hsmmc_host *host = dev_id;
+
+	/* cirq is level triggered, disable to avoid infinite loop */
+	spin_lock(&host->irq_lock);
+	if (host->flags & HSMMC_WAKE_IRQ_ENABLED) {
+		disable_irq_nosync(host->wake_irq);
+		host->flags &= ~HSMMC_WAKE_IRQ_ENABLED;
+	}
+	spin_unlock(&host->irq_lock);
+	pm_request_resume(host->dev); /* no use counter */
+
+	return IRQ_HANDLED;
+}
+
+static void set_sd_bus_power(struct omap_hsmmc_host *host)
+{
+	unsigned long i;
+
+	OMAP_HSMMC_WRITE(host->base, HCTL,
+			 OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
+	for (i = 0; i < loops_per_jiffy; i++) {
+		if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP)
+			break;
+		cpu_relax();
+	}
+}
+
+/*
+ * Switch MMC interface voltage ... only relevant for MMC1.
+ *
+ * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver.
+ * The MMC2 transceiver controls are used instead of DAT4..DAT7.
+ * Some chips, like eMMC ones, use internal transceivers.
+ */
+static int omap_hsmmc_switch_opcond(struct omap_hsmmc_host *host, int vdd)
+{
+	u32 reg_val = 0;
+	int ret;
+
+	/* Disable the clocks */
+	pm_runtime_put_sync(host->dev);
+	if (host->dbclk)
+		clk_disable_unprepare(host->dbclk);
+
+	/* Turn the power off */
+	ret = mmc_pdata(host)->set_power(host->dev, 0, 0);
+
+	/* Turn the power ON with given VDD 1.8 or 3.0v */
+	if (!ret)
+		ret = mmc_pdata(host)->set_power(host->dev, 1, vdd);
+	pm_runtime_get_sync(host->dev);
+	if (host->dbclk)
+		clk_prepare_enable(host->dbclk);
+
+	if (ret != 0)
+		goto err;
+
+	OMAP_HSMMC_WRITE(host->base, HCTL,
+		OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
+	reg_val = OMAP_HSMMC_READ(host->base, HCTL);
+
+	/*
+	 * If a MMC dual voltage card is detected, the set_ios fn calls
+	 * this fn with VDD bit set for 1.8V. Upon card removal from the
+	 * slot, omap_hsmmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF.
+	 *
+	 * Cope with a bit of slop in the range ... per data sheets:
+	 *  - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max,
+	 *    but recommended values are 1.71V to 1.89V
+	 *  - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max,
+	 *    but recommended values are 2.7V to 3.3V
+	 *
+	 * Board setup code shouldn't permit anything very out-of-range.
+	 * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the
+	 * middle range) but VSIM can't power DAT4..DAT7 at more than 3V.
+	 */
+	if ((1 << vdd) <= MMC_VDD_23_24)
+		reg_val |= SDVS18;
+	else
+		reg_val |= SDVS30;
+
+	OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
+	set_sd_bus_power(host);
+
+	return 0;
+err:
+	dev_err(mmc_dev(host->mmc), "Unable to switch operating voltage\n");
+	return ret;
+}
+
+/* Protect the card while the cover is open */
+static void omap_hsmmc_protect_card(struct omap_hsmmc_host *host)
+{
+	if (!host->get_cover_state)
+		return;
+
+	host->reqs_blocked = 0;
+	if (host->get_cover_state(host->dev)) {
+		if (host->protect_card) {
+			dev_info(host->dev, "%s: cover is closed, "
+					 "card is now accessible\n",
+					 mmc_hostname(host->mmc));
+			host->protect_card = 0;
+		}
+	} else {
+		if (!host->protect_card) {
+			dev_info(host->dev, "%s: cover is open, "
+					 "card is now inaccessible\n",
+					 mmc_hostname(host->mmc));
+			host->protect_card = 1;
+		}
+	}
+}
+
+/*
+ * irq handler when (cell-phone) cover is mounted/removed
+ */
+static irqreturn_t omap_hsmmc_cover_irq(int irq, void *dev_id)
+{
+	struct omap_hsmmc_host *host = dev_id;
+
+	sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
+
+	omap_hsmmc_protect_card(host);
+	mmc_detect_change(host->mmc, (HZ * 200) / 1000);
+	return IRQ_HANDLED;
+}
+
+static void omap_hsmmc_dma_callback(void *param)
+{
+	struct omap_hsmmc_host *host = param;
+	struct dma_chan *chan;
+	struct mmc_data *data;
+	int req_in_progress;
+
+	spin_lock_irq(&host->irq_lock);
+	if (host->dma_ch < 0) {
+		spin_unlock_irq(&host->irq_lock);
+		return;
+	}
+
+	data = host->mrq->data;
+	chan = omap_hsmmc_get_dma_chan(host, data);
+	if (!data->host_cookie)
+		dma_unmap_sg(chan->device->dev,
+			     data->sg, data->sg_len,
+			     omap_hsmmc_get_dma_dir(host, data));
+
+	req_in_progress = host->req_in_progress;
+	host->dma_ch = -1;
+	spin_unlock_irq(&host->irq_lock);
+
+	/* If DMA has finished after TC, complete the request */
+	if (!req_in_progress) {
+		struct mmc_request *mrq = host->mrq;
+
+		host->mrq = NULL;
+		mmc_request_done(host->mmc, mrq);
+		pm_runtime_mark_last_busy(host->dev);
+		pm_runtime_put_autosuspend(host->dev);
+	}
+}
+
+static int omap_hsmmc_pre_dma_transfer(struct omap_hsmmc_host *host,
+				       struct mmc_data *data,
+				       struct omap_hsmmc_next *next,
+				       struct dma_chan *chan)
+{
+	int dma_len;
+
+	if (!next && data->host_cookie &&
+	    data->host_cookie != host->next_data.cookie) {
+		dev_warn(host->dev, "[%s] invalid cookie: data->host_cookie %d"
+		       " host->next_data.cookie %d\n",
+		       __func__, data->host_cookie, host->next_data.cookie);
+		data->host_cookie = 0;
+	}
+
+	/* Check if next job is already prepared */
+	if (next || data->host_cookie != host->next_data.cookie) {
+		dma_len = dma_map_sg(chan->device->dev, data->sg, data->sg_len,
+				     omap_hsmmc_get_dma_dir(host, data));
+
+	} else {
+		dma_len = host->next_data.dma_len;
+		host->next_data.dma_len = 0;
+	}
+
+
+	if (dma_len == 0)
+		return -EINVAL;
+
+	if (next) {
+		next->dma_len = dma_len;
+		data->host_cookie = ++next->cookie < 0 ? 1 : next->cookie;
+	} else
+		host->dma_len = dma_len;
+
+	return 0;
+}
+
+/*
+ * Routine to configure and start DMA for the MMC card
+ */
+static int omap_hsmmc_setup_dma_transfer(struct omap_hsmmc_host *host,
+					struct mmc_request *req)
+{
+	struct dma_slave_config cfg;
+	struct dma_async_tx_descriptor *tx;
+	int ret = 0, i;
+	struct mmc_data *data = req->data;
+	struct dma_chan *chan;
+
+	/* Sanity check: all the SG entries must be aligned by block size. */
+	for (i = 0; i < data->sg_len; i++) {
+		struct scatterlist *sgl;
+
+		sgl = data->sg + i;
+		if (sgl->length % data->blksz)
+			return -EINVAL;
+	}
+	if ((data->blksz % 4) != 0)
+		/* REVISIT: The MMC buffer increments only when MSB is written.
+		 * Return error for blksz which is non multiple of four.
+		 */
+		return -EINVAL;
+
+	BUG_ON(host->dma_ch != -1);
+
+	chan = omap_hsmmc_get_dma_chan(host, data);
+
+	cfg.src_addr = host->mapbase + OMAP_HSMMC_DATA;
+	cfg.dst_addr = host->mapbase + OMAP_HSMMC_DATA;
+	cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	cfg.src_maxburst = data->blksz / 4;
+	cfg.dst_maxburst = data->blksz / 4;
+
+	ret = dmaengine_slave_config(chan, &cfg);
+	if (ret)
+		return ret;
+
+	ret = omap_hsmmc_pre_dma_transfer(host, data, NULL, chan);
+	if (ret)
+		return ret;
+
+	tx = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len,
+		data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
+		DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+	if (!tx) {
+		dev_err(mmc_dev(host->mmc), "prep_slave_sg() failed\n");
+		/* FIXME: cleanup */
+		return -1;
+	}
+
+	tx->callback = omap_hsmmc_dma_callback;
+	tx->callback_param = host;
+
+	/* Does not fail */
+	dmaengine_submit(tx);
+
+	host->dma_ch = 1;
+
+	return 0;
+}
+
+static void set_data_timeout(struct omap_hsmmc_host *host,
+			     unsigned int timeout_ns,
+			     unsigned int timeout_clks)
+{
+	unsigned int timeout, cycle_ns;
+	uint32_t reg, clkd, dto = 0;
+
+	reg = OMAP_HSMMC_READ(host->base, SYSCTL);
+	clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
+	if (clkd == 0)
+		clkd = 1;
+
+	cycle_ns = 1000000000 / (host->clk_rate / clkd);
+	timeout = timeout_ns / cycle_ns;
+	timeout += timeout_clks;
+	if (timeout) {
+		while ((timeout & 0x80000000) == 0) {
+			dto += 1;
+			timeout <<= 1;
+		}
+		dto = 31 - dto;
+		timeout <<= 1;
+		if (timeout && dto)
+			dto += 1;
+		if (dto >= 13)
+			dto -= 13;
+		else
+			dto = 0;
+		if (dto > 14)
+			dto = 14;
+	}
+
+	reg &= ~DTO_MASK;
+	reg |= dto << DTO_SHIFT;
+	OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
+}
+
+static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host)
+{
+	struct mmc_request *req = host->mrq;
+	struct dma_chan *chan;
+
+	if (!req->data)
+		return;
+	OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
+				| (req->data->blocks << 16));
+	set_data_timeout(host, req->data->timeout_ns,
+				req->data->timeout_clks);
+	chan = omap_hsmmc_get_dma_chan(host, req->data);
+	dma_async_issue_pending(chan);
+}
+
+/*
+ * Configure block length for MMC/SD cards and initiate the transfer.
+ */
+static int
+omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req)
+{
+	int ret;
+	host->data = req->data;
+
+	if (req->data == NULL) {
+		OMAP_HSMMC_WRITE(host->base, BLK, 0);
+		/*
+		 * Set an arbitrary 100ms data timeout for commands with
+		 * busy signal.
+		 */
+		if (req->cmd->flags & MMC_RSP_BUSY)
+			set_data_timeout(host, 100000000U, 0);
+		return 0;
+	}
+
+	if (host->use_dma) {
+		ret = omap_hsmmc_setup_dma_transfer(host, req);
+		if (ret != 0) {
+			dev_err(mmc_dev(host->mmc), "MMC start dma failure\n");
+			return ret;
+		}
+	}
+	return 0;
+}
+
+static void omap_hsmmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
+				int err)
+{
+	struct omap_hsmmc_host *host = mmc_priv(mmc);
+	struct mmc_data *data = mrq->data;
+
+	if (host->use_dma && data->host_cookie) {
+		struct dma_chan *c = omap_hsmmc_get_dma_chan(host, data);
+
+		dma_unmap_sg(c->device->dev, data->sg, data->sg_len,
+			     omap_hsmmc_get_dma_dir(host, data));
+		data->host_cookie = 0;
+	}
+}
+
+static void omap_hsmmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq,
+			       bool is_first_req)
+{
+	struct omap_hsmmc_host *host = mmc_priv(mmc);
+
+	if (mrq->data->host_cookie) {
+		mrq->data->host_cookie = 0;
+		return ;
+	}
+
+	if (host->use_dma) {
+		struct dma_chan *c = omap_hsmmc_get_dma_chan(host, mrq->data);
+
+		if (omap_hsmmc_pre_dma_transfer(host, mrq->data,
+						&host->next_data, c))
+			mrq->data->host_cookie = 0;
+	}
+}
+
+/*
+ * Request function. for read/write operation
+ */
+static void omap_hsmmc_request(struct mmc_host *mmc, struct mmc_request *req)
+{
+	struct omap_hsmmc_host *host = mmc_priv(mmc);
+	int err;
+
+	BUG_ON(host->req_in_progress);
+	BUG_ON(host->dma_ch != -1);
+	pm_runtime_get_sync(host->dev);
+	if (host->protect_card) {
+		if (host->reqs_blocked < 3) {
+			/*
+			 * Ensure the controller is left in a consistent
+			 * state by resetting the command and data state
+			 * machines.
+			 */
+			omap_hsmmc_reset_controller_fsm(host, SRD);
+			omap_hsmmc_reset_controller_fsm(host, SRC);
+			host->reqs_blocked += 1;
+		}
+		req->cmd->error = -EBADF;
+		if (req->data)
+			req->data->error = -EBADF;
+		req->cmd->retries = 0;
+		mmc_request_done(mmc, req);
+		pm_runtime_mark_last_busy(host->dev);
+		pm_runtime_put_autosuspend(host->dev);
+		return;
+	} else if (host->reqs_blocked)
+		host->reqs_blocked = 0;
+	WARN_ON(host->mrq != NULL);
+	host->mrq = req;
+	host->clk_rate = clk_get_rate(host->fclk);
+	err = omap_hsmmc_prepare_data(host, req);
+	if (err) {
+		req->cmd->error = err;
+		if (req->data)
+			req->data->error = err;
+		host->mrq = NULL;
+		mmc_request_done(mmc, req);
+		pm_runtime_mark_last_busy(host->dev);
+		pm_runtime_put_autosuspend(host->dev);
+		return;
+	}
+	if (req->sbc && !(host->flags & AUTO_CMD23)) {
+		omap_hsmmc_start_command(host, req->sbc, NULL);
+		return;
+	}
+
+	omap_hsmmc_start_dma_transfer(host);
+	omap_hsmmc_start_command(host, req->cmd, req->data);
+}
+
+/* Routine to configure clock values. Exposed API to core */
+static void omap_hsmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct omap_hsmmc_host *host = mmc_priv(mmc);
+	int do_send_init_stream = 0;
+
+	pm_runtime_get_sync(host->dev);
+
+	if (ios->power_mode != host->power_mode) {
+		switch (ios->power_mode) {
+		case MMC_POWER_OFF:
+			mmc_pdata(host)->set_power(host->dev, 0, 0);
+			break;
+		case MMC_POWER_UP:
+			mmc_pdata(host)->set_power(host->dev, 1, ios->vdd);
+			break;
+		case MMC_POWER_ON:
+			do_send_init_stream = 1;
+			break;
+		}
+		host->power_mode = ios->power_mode;
+	}
+
+	/* FIXME: set registers based only on changes to ios */
+
+	omap_hsmmc_set_bus_width(host);
+
+	if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
+		/* Only MMC1 can interface at 3V without some flavor
+		 * of external transceiver; but they all handle 1.8V.
+		 */
+		if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
+			(ios->vdd == DUAL_VOLT_OCR_BIT)) {
+				/*
+				 * The mmc_select_voltage fn of the core does
+				 * not seem to set the power_mode to
+				 * MMC_POWER_UP upon recalculating the voltage.
+				 * vdd 1.8v.
+				 */
+			if (omap_hsmmc_switch_opcond(host, ios->vdd) != 0)
+				dev_dbg(mmc_dev(host->mmc),
+						"Switch operation failed\n");
+		}
+	}
+
+	omap_hsmmc_set_clock(host);
+
+	if (do_send_init_stream)
+		send_init_stream(host);
+
+	omap_hsmmc_set_bus_mode(host);
+
+	pm_runtime_put_autosuspend(host->dev);
+}
+
+static int omap_hsmmc_get_cd(struct mmc_host *mmc)
+{
+	struct omap_hsmmc_host *host = mmc_priv(mmc);
+
+	if (!host->card_detect)
+		return -ENOSYS;
+	return host->card_detect(host->dev);
+}
+
+static void omap_hsmmc_init_card(struct mmc_host *mmc, struct mmc_card *card)
+{
+	struct omap_hsmmc_host *host = mmc_priv(mmc);
+
+	if (mmc_pdata(host)->init_card)
+		mmc_pdata(host)->init_card(card);
+}
+
+static void omap_hsmmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+	struct omap_hsmmc_host *host = mmc_priv(mmc);
+	u32 irq_mask, con;
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->irq_lock, flags);
+
+	con = OMAP_HSMMC_READ(host->base, CON);
+	irq_mask = OMAP_HSMMC_READ(host->base, ISE);
+	if (enable) {
+		host->flags |= HSMMC_SDIO_IRQ_ENABLED;
+		irq_mask |= CIRQ_EN;
+		con |= CTPL | CLKEXTFREE;
+	} else {
+		host->flags &= ~HSMMC_SDIO_IRQ_ENABLED;
+		irq_mask &= ~CIRQ_EN;
+		con &= ~(CTPL | CLKEXTFREE);
+	}
+	OMAP_HSMMC_WRITE(host->base, CON, con);
+	OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
+
+	/*
+	 * if enable, piggy back detection on current request
+	 * but always disable immediately
+	 */
+	if (!host->req_in_progress || !enable)
+		OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
+
+	/* flush posted write */
+	OMAP_HSMMC_READ(host->base, IE);
+
+	spin_unlock_irqrestore(&host->irq_lock, flags);
+}
+
+static int omap_hsmmc_configure_wake_irq(struct omap_hsmmc_host *host)
+{
+	struct mmc_host *mmc = host->mmc;
+	int ret;
+
+	/*
+	 * For omaps with wake-up path, wakeirq will be irq from pinctrl and
+	 * for other omaps, wakeirq will be from GPIO (dat line remuxed to
+	 * gpio). wakeirq is needed to detect sdio irq in runtime suspend state
+	 * with functional clock disabled.
+	 */
+	if (!host->dev->of_node || !host->wake_irq)
+		return -ENODEV;
+
+	/* Prevent auto-enabling of IRQ */
+	irq_set_status_flags(host->wake_irq, IRQ_NOAUTOEN);
+	ret = devm_request_irq(host->dev, host->wake_irq, omap_hsmmc_wake_irq,
+			       IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+			       mmc_hostname(mmc), host);
+	if (ret) {
+		dev_err(mmc_dev(host->mmc), "Unable to request wake IRQ\n");
+		goto err;
+	}
+
+	/*
+	 * Some omaps don't have wake-up path from deeper idle states
+	 * and need to remux SDIO DAT1 to GPIO for wake-up from idle.
+	 */
+	if (host->pdata->controller_flags & OMAP_HSMMC_SWAKEUP_MISSING) {
+		struct pinctrl *p = devm_pinctrl_get(host->dev);
+		if (!p) {
+			ret = -ENODEV;
+			goto err_free_irq;
+		}
+		if (IS_ERR(pinctrl_lookup_state(p, PINCTRL_STATE_DEFAULT))) {
+			dev_info(host->dev, "missing default pinctrl state\n");
+			devm_pinctrl_put(p);
+			ret = -EINVAL;
+			goto err_free_irq;
+		}
+
+		if (IS_ERR(pinctrl_lookup_state(p, PINCTRL_STATE_IDLE))) {
+			dev_info(host->dev, "missing idle pinctrl state\n");
+			devm_pinctrl_put(p);
+			ret = -EINVAL;
+			goto err_free_irq;
+		}
+		devm_pinctrl_put(p);
+	}
+
+	OMAP_HSMMC_WRITE(host->base, HCTL,
+			 OMAP_HSMMC_READ(host->base, HCTL) | IWE);
+	return 0;
+
+err_free_irq:
+	devm_free_irq(host->dev, host->wake_irq, host);
+err:
+	dev_warn(host->dev, "no SDIO IRQ support, falling back to polling\n");
+	host->wake_irq = 0;
+	return ret;
+}
+
+static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host)
+{
+	u32 hctl, capa, value;
+
+	/* Only MMC1 supports 3.0V */
+	if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
+		hctl = SDVS30;
+		capa = VS30 | VS18;
+	} else {
+		hctl = SDVS18;
+		capa = VS18;
+	}
+
+	value = OMAP_HSMMC_READ(host->base, HCTL) & ~SDVS_MASK;
+	OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl);
+
+	value = OMAP_HSMMC_READ(host->base, CAPA);
+	OMAP_HSMMC_WRITE(host->base, CAPA, value | capa);
+
+	/* Set SD bus power bit */
+	set_sd_bus_power(host);
+}
+
+static int omap_hsmmc_multi_io_quirk(struct mmc_card *card,
+				     unsigned int direction, int blk_size)
+{
+	/* This controller can't do multiblock reads due to hw bugs */
+	if (direction == MMC_DATA_READ)
+		return 1;
+
+	return blk_size;
+}
+
+static struct mmc_host_ops omap_hsmmc_ops = {
+	.post_req = omap_hsmmc_post_req,
+	.pre_req = omap_hsmmc_pre_req,
+	.request = omap_hsmmc_request,
+	.set_ios = omap_hsmmc_set_ios,
+	.get_cd = omap_hsmmc_get_cd,
+	.get_ro = mmc_gpio_get_ro,
+	.init_card = omap_hsmmc_init_card,
+	.enable_sdio_irq = omap_hsmmc_enable_sdio_irq,
+};
+
+#ifdef CONFIG_DEBUG_FS
+
+static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
+{
+	struct mmc_host *mmc = s->private;
+	struct omap_hsmmc_host *host = mmc_priv(mmc);
+
+	seq_printf(s, "mmc%d:\n", mmc->index);
+	seq_printf(s, "sdio irq mode\t%s\n",
+		   (mmc->caps & MMC_CAP_SDIO_IRQ) ? "interrupt" : "polling");
+
+	if (mmc->caps & MMC_CAP_SDIO_IRQ) {
+		seq_printf(s, "sdio irq \t%s\n",
+			   (host->flags & HSMMC_SDIO_IRQ_ENABLED) ?  "enabled"
+			   : "disabled");
+	}
+	seq_printf(s, "ctx_loss:\t%d\n", host->context_loss);
+
+	pm_runtime_get_sync(host->dev);
+	seq_puts(s, "\nregs:\n");
+	seq_printf(s, "CON:\t\t0x%08x\n",
+			OMAP_HSMMC_READ(host->base, CON));
+	seq_printf(s, "PSTATE:\t\t0x%08x\n",
+		   OMAP_HSMMC_READ(host->base, PSTATE));
+	seq_printf(s, "HCTL:\t\t0x%08x\n",
+			OMAP_HSMMC_READ(host->base, HCTL));
+	seq_printf(s, "SYSCTL:\t\t0x%08x\n",
+			OMAP_HSMMC_READ(host->base, SYSCTL));
+	seq_printf(s, "IE:\t\t0x%08x\n",
+			OMAP_HSMMC_READ(host->base, IE));
+	seq_printf(s, "ISE:\t\t0x%08x\n",
+			OMAP_HSMMC_READ(host->base, ISE));
+	seq_printf(s, "CAPA:\t\t0x%08x\n",
+			OMAP_HSMMC_READ(host->base, CAPA));
+
+	pm_runtime_mark_last_busy(host->dev);
+	pm_runtime_put_autosuspend(host->dev);
+
+	return 0;
+}
+
+static int omap_hsmmc_regs_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, omap_hsmmc_regs_show, inode->i_private);
+}
+
+static const struct file_operations mmc_regs_fops = {
+	.open           = omap_hsmmc_regs_open,
+	.read           = seq_read,
+	.llseek         = seq_lseek,
+	.release        = single_release,
+};
+
+static void omap_hsmmc_debugfs(struct mmc_host *mmc)
+{
+	if (mmc->debugfs_root)
+		debugfs_create_file("regs", S_IRUSR, mmc->debugfs_root,
+			mmc, &mmc_regs_fops);
+}
+
+#else
+
+static void omap_hsmmc_debugfs(struct mmc_host *mmc)
+{
+}
+
+#endif
+
+#ifdef CONFIG_OF
+static const struct omap_mmc_of_data omap3_pre_es3_mmc_of_data = {
+	/* See 35xx errata 2.1.1.128 in SPRZ278F */
+	.controller_flags = OMAP_HSMMC_BROKEN_MULTIBLOCK_READ,
+};
+
+static const struct omap_mmc_of_data omap4_mmc_of_data = {
+	.reg_offset = 0x100,
+};
+static const struct omap_mmc_of_data am33xx_mmc_of_data = {
+	.reg_offset = 0x100,
+	.controller_flags = OMAP_HSMMC_SWAKEUP_MISSING,
+};
+
+static const struct of_device_id omap_mmc_of_match[] = {
+	{
+		.compatible = "ti,omap2-hsmmc",
+	},
+	{
+		.compatible = "ti,omap3-pre-es3-hsmmc",
+		.data = &omap3_pre_es3_mmc_of_data,
+	},
+	{
+		.compatible = "ti,omap3-hsmmc",
+	},
+	{
+		.compatible = "ti,omap4-hsmmc",
+		.data = &omap4_mmc_of_data,
+	},
+	{
+		.compatible = "ti,am33xx-hsmmc",
+		.data = &am33xx_mmc_of_data,
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, omap_mmc_of_match);
+
+static struct omap_hsmmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
+{
+	struct omap_hsmmc_platform_data *pdata;
+	struct device_node *np = dev->of_node;
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return ERR_PTR(-ENOMEM); /* out of memory */
+
+	if (of_find_property(np, "ti,dual-volt", NULL))
+		pdata->controller_flags |= OMAP_HSMMC_SUPPORTS_DUAL_VOLT;
+
+	pdata->gpio_cd = -EINVAL;
+	pdata->gpio_cod = -EINVAL;
+	pdata->gpio_wp = -EINVAL;
+
+	if (of_find_property(np, "ti,non-removable", NULL)) {
+		pdata->nonremovable = true;
+		pdata->no_regulator_off_init = true;
+	}
+
+	if (of_find_property(np, "ti,needs-special-reset", NULL))
+		pdata->features |= HSMMC_HAS_UPDATED_RESET;
+
+	if (of_find_property(np, "ti,needs-special-hs-handling", NULL))
+		pdata->features |= HSMMC_HAS_HSPE_SUPPORT;
+
+	return pdata;
+}
+#else
+static inline struct omap_hsmmc_platform_data
+			*of_get_hsmmc_pdata(struct device *dev)
+{
+	return ERR_PTR(-EINVAL);
+}
+#endif
+
+static int omap_hsmmc_probe(struct platform_device *pdev)
+{
+	struct omap_hsmmc_platform_data *pdata = pdev->dev.platform_data;
+	struct mmc_host *mmc;
+	struct omap_hsmmc_host *host = NULL;
+	struct resource *res;
+	int ret, irq;
+	const struct of_device_id *match;
+	dma_cap_mask_t mask;
+	unsigned tx_req, rx_req;
+	const struct omap_mmc_of_data *data;
+	void __iomem *base;
+
+	match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev);
+	if (match) {
+		pdata = of_get_hsmmc_pdata(&pdev->dev);
+
+		if (IS_ERR(pdata))
+			return PTR_ERR(pdata);
+
+		if (match->data) {
+			data = match->data;
+			pdata->reg_offset = data->reg_offset;
+			pdata->controller_flags |= data->controller_flags;
+		}
+	}
+
+	if (pdata == NULL) {
+		dev_err(&pdev->dev, "Platform Data is missing\n");
+		return -ENXIO;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	irq = platform_get_irq(pdev, 0);
+	if (res == NULL || irq < 0)
+		return -ENXIO;
+
+	base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	mmc = mmc_alloc_host(sizeof(struct omap_hsmmc_host), &pdev->dev);
+	if (!mmc) {
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	ret = mmc_of_parse(mmc);
+	if (ret)
+		goto err1;
+
+	host		= mmc_priv(mmc);
+	host->mmc	= mmc;
+	host->pdata	= pdata;
+	host->dev	= &pdev->dev;
+	host->use_dma	= 1;
+	host->dma_ch	= -1;
+	host->irq	= irq;
+	host->mapbase	= res->start + pdata->reg_offset;
+	host->base	= base + pdata->reg_offset;
+	host->power_mode = MMC_POWER_OFF;
+	host->next_data.cookie = 1;
+	host->pbias_enabled = 0;
+
+	ret = omap_hsmmc_gpio_init(mmc, host, pdata);
+	if (ret)
+		goto err_gpio;
+
+	platform_set_drvdata(pdev, host);
+
+	if (pdev->dev.of_node)
+		host->wake_irq = irq_of_parse_and_map(pdev->dev.of_node, 1);
+
+	mmc->ops	= &omap_hsmmc_ops;
+
+	mmc->f_min = OMAP_MMC_MIN_CLOCK;
+
+	if (pdata->max_freq > 0)
+		mmc->f_max = pdata->max_freq;
+	else if (mmc->f_max == 0)
+		mmc->f_max = OMAP_MMC_MAX_CLOCK;
+
+	spin_lock_init(&host->irq_lock);
+
+	host->fclk = devm_clk_get(&pdev->dev, "fck");
+	if (IS_ERR(host->fclk)) {
+		ret = PTR_ERR(host->fclk);
+		host->fclk = NULL;
+		goto err1;
+	}
+
+	if (host->pdata->controller_flags & OMAP_HSMMC_BROKEN_MULTIBLOCK_READ) {
+		dev_info(&pdev->dev, "multiblock reads disabled due to 35xx erratum 2.1.1.128; MMC read performance may suffer\n");
+		omap_hsmmc_ops.multi_io_quirk = omap_hsmmc_multi_io_quirk;
+	}
+
+	pm_runtime_enable(host->dev);
+	pm_runtime_get_sync(host->dev);
+	pm_runtime_set_autosuspend_delay(host->dev, MMC_AUTOSUSPEND_DELAY);
+	pm_runtime_use_autosuspend(host->dev);
+
+	omap_hsmmc_context_save(host);
+
+	host->dbclk = devm_clk_get(&pdev->dev, "mmchsdb_fck");
+	/*
+	 * MMC can still work without debounce clock.
+	 */
+	if (IS_ERR(host->dbclk)) {
+		host->dbclk = NULL;
+	} else if (clk_prepare_enable(host->dbclk) != 0) {
+		dev_warn(mmc_dev(host->mmc), "Failed to enable debounce clk\n");
+		host->dbclk = NULL;
+	}
+
+	/* Since we do only SG emulation, we can have as many segs
+	 * as we want. */
+	mmc->max_segs = 1024;
+
+	mmc->max_blk_size = 512;       /* Block Length at max can be 1024 */
+	mmc->max_blk_count = 0xFFFF;    /* No. of Blocks is 16 bits */
+	mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
+	mmc->max_seg_size = mmc->max_req_size;
+
+	mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
+		     MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_ERASE;
+
+	mmc->caps |= mmc_pdata(host)->caps;
+	if (mmc->caps & MMC_CAP_8_BIT_DATA)
+		mmc->caps |= MMC_CAP_4_BIT_DATA;
+
+	if (mmc_pdata(host)->nonremovable)
+		mmc->caps |= MMC_CAP_NONREMOVABLE;
+
+	mmc->pm_caps |= mmc_pdata(host)->pm_caps;
+
+	omap_hsmmc_conf_bus_power(host);
+
+	if (!pdev->dev.of_node) {
+		res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
+		if (!res) {
+			dev_err(mmc_dev(host->mmc), "cannot get DMA TX channel\n");
+			ret = -ENXIO;
+			goto err_irq;
+		}
+		tx_req = res->start;
+
+		res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
+		if (!res) {
+			dev_err(mmc_dev(host->mmc), "cannot get DMA RX channel\n");
+			ret = -ENXIO;
+			goto err_irq;
+		}
+		rx_req = res->start;
+	}
+
+	dma_cap_zero(mask);
+	dma_cap_set(DMA_SLAVE, mask);
+
+	host->rx_chan =
+		dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
+						 &rx_req, &pdev->dev, "rx");
+
+	if (!host->rx_chan) {
+		dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
+		ret = -ENXIO;
+		goto err_irq;
+	}
+
+	host->tx_chan =
+		dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
+						 &tx_req, &pdev->dev, "tx");
+
+	if (!host->tx_chan) {
+		dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel %u\n", tx_req);
+		ret = -ENXIO;
+		goto err_irq;
+	}
+
+	/* Request IRQ for MMC operations */
+	ret = devm_request_irq(&pdev->dev, host->irq, omap_hsmmc_irq, 0,
+			mmc_hostname(mmc), host);
+	if (ret) {
+		dev_err(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n");
+		goto err_irq;
+	}
+
+	if (omap_hsmmc_have_reg() && !mmc_pdata(host)->set_power) {
+		ret = omap_hsmmc_reg_get(host);
+		if (ret)
+			goto err_irq;
+		host->use_reg = 1;
+	}
+
+	mmc->ocr_avail = mmc_pdata(host)->ocr_mask;
+
+	omap_hsmmc_disable_irq(host);
+
+	/*
+	 * For now, only support SDIO interrupt if we have a separate
+	 * wake-up interrupt configured from device tree. This is because
+	 * the wake-up interrupt is needed for idle state and some
+	 * platforms need special quirks. And we don't want to add new
+	 * legacy mux platform init code callbacks any longer as we
+	 * are moving to DT based booting anyways.
+	 */
+	ret = omap_hsmmc_configure_wake_irq(host);
+	if (!ret)
+		mmc->caps |= MMC_CAP_SDIO_IRQ;
+
+	omap_hsmmc_protect_card(host);
+
+	mmc_add_host(mmc);
+
+	if (mmc_pdata(host)->name != NULL) {
+		ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);
+		if (ret < 0)
+			goto err_slot_name;
+	}
+	if (host->get_cover_state) {
+		ret = device_create_file(&mmc->class_dev,
+					 &dev_attr_cover_switch);
+		if (ret < 0)
+			goto err_slot_name;
+	}
+
+	omap_hsmmc_debugfs(mmc);
+	pm_runtime_mark_last_busy(host->dev);
+	pm_runtime_put_autosuspend(host->dev);
+
+	return 0;
+
+err_slot_name:
+	mmc_remove_host(mmc);
+	if (host->use_reg)
+		omap_hsmmc_reg_put(host);
+err_irq:
+	if (host->tx_chan)
+		dma_release_channel(host->tx_chan);
+	if (host->rx_chan)
+		dma_release_channel(host->rx_chan);
+	pm_runtime_put_sync(host->dev);
+	pm_runtime_disable(host->dev);
+	if (host->dbclk)
+		clk_disable_unprepare(host->dbclk);
+err1:
+err_gpio:
+	mmc_free_host(mmc);
+err:
+	return ret;
+}
+
+static int omap_hsmmc_remove(struct platform_device *pdev)
+{
+	struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
+
+	pm_runtime_get_sync(host->dev);
+	mmc_remove_host(host->mmc);
+	if (host->use_reg)
+		omap_hsmmc_reg_put(host);
+
+	if (host->tx_chan)
+		dma_release_channel(host->tx_chan);
+	if (host->rx_chan)
+		dma_release_channel(host->rx_chan);
+
+	pm_runtime_put_sync(host->dev);
+	pm_runtime_disable(host->dev);
+	if (host->dbclk)
+		clk_disable_unprepare(host->dbclk);
+
+	mmc_free_host(host->mmc);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int omap_hsmmc_suspend(struct device *dev)
+{
+	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
+
+	if (!host)
+		return 0;
+
+	pm_runtime_get_sync(host->dev);
+
+	if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER)) {
+		OMAP_HSMMC_WRITE(host->base, ISE, 0);
+		OMAP_HSMMC_WRITE(host->base, IE, 0);
+		OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
+		OMAP_HSMMC_WRITE(host->base, HCTL,
+				OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
+	}
+
+	/* do not wake up due to sdio irq */
+	if ((host->mmc->caps & MMC_CAP_SDIO_IRQ) &&
+	    !(host->mmc->pm_flags & MMC_PM_WAKE_SDIO_IRQ))
+		disable_irq(host->wake_irq);
+
+	if (host->dbclk)
+		clk_disable_unprepare(host->dbclk);
+
+	pm_runtime_put_sync(host->dev);
+	return 0;
+}
+
+/* Routine to resume the MMC device */
+static int omap_hsmmc_resume(struct device *dev)
+{
+	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
+
+	if (!host)
+		return 0;
+
+	pm_runtime_get_sync(host->dev);
+
+	if (host->dbclk)
+		clk_prepare_enable(host->dbclk);
+
+	if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER))
+		omap_hsmmc_conf_bus_power(host);
+
+	omap_hsmmc_protect_card(host);
+
+	if ((host->mmc->caps & MMC_CAP_SDIO_IRQ) &&
+	    !(host->mmc->pm_flags & MMC_PM_WAKE_SDIO_IRQ))
+		enable_irq(host->wake_irq);
+
+	pm_runtime_mark_last_busy(host->dev);
+	pm_runtime_put_autosuspend(host->dev);
+	return 0;
+}
+#endif
+
+static int omap_hsmmc_runtime_suspend(struct device *dev)
+{
+	struct omap_hsmmc_host *host;
+	unsigned long flags;
+	int ret = 0;
+
+	host = platform_get_drvdata(to_platform_device(dev));
+	omap_hsmmc_context_save(host);
+	dev_dbg(dev, "disabled\n");
+
+	spin_lock_irqsave(&host->irq_lock, flags);
+	if ((host->mmc->caps & MMC_CAP_SDIO_IRQ) &&
+	    (host->flags & HSMMC_SDIO_IRQ_ENABLED)) {
+		/* disable sdio irq handling to prevent race */
+		OMAP_HSMMC_WRITE(host->base, ISE, 0);
+		OMAP_HSMMC_WRITE(host->base, IE, 0);
+
+		if (!(OMAP_HSMMC_READ(host->base, PSTATE) & DLEV_DAT(1))) {
+			/*
+			 * dat1 line low, pending sdio irq
+			 * race condition: possible irq handler running on
+			 * multi-core, abort
+			 */
+			dev_dbg(dev, "pending sdio irq, abort suspend\n");
+			OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
+			OMAP_HSMMC_WRITE(host->base, ISE, CIRQ_EN);
+			OMAP_HSMMC_WRITE(host->base, IE, CIRQ_EN);
+			pm_runtime_mark_last_busy(dev);
+			ret = -EBUSY;
+			goto abort;
+		}
+
+		pinctrl_pm_select_idle_state(dev);
+
+		WARN_ON(host->flags & HSMMC_WAKE_IRQ_ENABLED);
+		enable_irq(host->wake_irq);
+		host->flags |= HSMMC_WAKE_IRQ_ENABLED;
+	} else {
+		pinctrl_pm_select_idle_state(dev);
+	}
+
+abort:
+	spin_unlock_irqrestore(&host->irq_lock, flags);
+	return ret;
+}
+
+static int omap_hsmmc_runtime_resume(struct device *dev)
+{
+	struct omap_hsmmc_host *host;
+	unsigned long flags;
+
+	host = platform_get_drvdata(to_platform_device(dev));
+	omap_hsmmc_context_restore(host);
+	dev_dbg(dev, "enabled\n");
+
+	spin_lock_irqsave(&host->irq_lock, flags);
+	if ((host->mmc->caps & MMC_CAP_SDIO_IRQ) &&
+	    (host->flags & HSMMC_SDIO_IRQ_ENABLED)) {
+		/* sdio irq flag can't change while in runtime suspend */
+		if (host->flags & HSMMC_WAKE_IRQ_ENABLED) {
+			disable_irq_nosync(host->wake_irq);
+			host->flags &= ~HSMMC_WAKE_IRQ_ENABLED;
+		}
+
+		pinctrl_pm_select_default_state(host->dev);
+
+		/* irq lost, if pinmux incorrect */
+		OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
+		OMAP_HSMMC_WRITE(host->base, ISE, CIRQ_EN);
+		OMAP_HSMMC_WRITE(host->base, IE, CIRQ_EN);
+	} else {
+		pinctrl_pm_select_default_state(host->dev);
+	}
+	spin_unlock_irqrestore(&host->irq_lock, flags);
+	return 0;
+}
+
+static struct dev_pm_ops omap_hsmmc_dev_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(omap_hsmmc_suspend, omap_hsmmc_resume)
+	.runtime_suspend = omap_hsmmc_runtime_suspend,
+	.runtime_resume = omap_hsmmc_runtime_resume,
+};
+
+static struct platform_driver omap_hsmmc_driver = {
+	.probe		= omap_hsmmc_probe,
+	.remove		= omap_hsmmc_remove,
+	.driver		= {
+		.name = DRIVER_NAME,
+		.pm = &omap_hsmmc_dev_pm_ops,
+		.of_match_table = of_match_ptr(omap_mmc_of_match),
+	},
+};
+
+module_platform_driver(omap_hsmmc_driver);
+MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRIVER_NAME);
+MODULE_AUTHOR("Texas Instruments Inc");