ARK-OS/arkos/kernel/drivers/mmc/host/sdhci-omap.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * SDHCI Controller driver for TI's OMAP SoCs
 *
 * Copyright (C) 2017 Texas Instruments
 * Author: Kishon Vijay Abraham I <kishon@ti.com>
 */

#include <linux/delay.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/slot-gpio.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/pm_wakeirq.h>
#include <linux/regulator/consumer.h>
#include <linux/pinctrl/consumer.h>
#include <linux/sys_soc.h>
#include <linux/thermal.h>

#include "sdhci-pltfm.h"

/*
 * Note that the register offsets used here are from omap_regs
 * base which is 0x100 for omap4 and later, and 0 for omap3 and
 * earlier.
 */
#define SDHCI_OMAP_SYSCONFIG	0x10

#define SDHCI_OMAP_CON		0x2c
#define CON_DW8			BIT(5)
#define CON_DMA_MASTER		BIT(20)
#define CON_DDR			BIT(19)
#define CON_CLKEXTFREE		BIT(16)
#define CON_PADEN		BIT(15)
#define CON_CTPL		BIT(11)
#define CON_INIT		BIT(1)
#define CON_OD			BIT(0)

#define SDHCI_OMAP_DLL		0x34
#define DLL_SWT			BIT(20)
#define DLL_FORCE_SR_C_SHIFT	13
#define DLL_FORCE_SR_C_MASK	(0x7f << DLL_FORCE_SR_C_SHIFT)
#define DLL_FORCE_VALUE		BIT(12)
#define DLL_CALIB		BIT(1)

#define SDHCI_OMAP_CMD		0x10c

#define SDHCI_OMAP_PSTATE	0x124
#define PSTATE_DLEV_DAT0	BIT(20)
#define PSTATE_DATI		BIT(1)

#define SDHCI_OMAP_HCTL		0x128
#define HCTL_SDBP		BIT(8)
#define HCTL_SDVS_SHIFT		9
#define HCTL_SDVS_MASK		(0x7 << HCTL_SDVS_SHIFT)
#define HCTL_SDVS_33		(0x7 << HCTL_SDVS_SHIFT)
#define HCTL_SDVS_30		(0x6 << HCTL_SDVS_SHIFT)
#define HCTL_SDVS_18		(0x5 << HCTL_SDVS_SHIFT)

#define SDHCI_OMAP_SYSCTL	0x12c
#define SYSCTL_CEN		BIT(2)
#define SYSCTL_CLKD_SHIFT	6
#define SYSCTL_CLKD_MASK	0x3ff

#define SDHCI_OMAP_STAT		0x130

#define SDHCI_OMAP_IE		0x134
#define INT_CC_EN		BIT(0)

#define SDHCI_OMAP_ISE		0x138

#define SDHCI_OMAP_AC12		0x13c
#define AC12_V1V8_SIGEN		BIT(19)
#define AC12_SCLK_SEL		BIT(23)

#define SDHCI_OMAP_CAPA		0x140
#define CAPA_VS33		BIT(24)
#define CAPA_VS30		BIT(25)
#define CAPA_VS18		BIT(26)

#define SDHCI_OMAP_CAPA2	0x144
#define CAPA2_TSDR50		BIT(13)

#define SDHCI_OMAP_TIMEOUT	1		/* 1 msec */

#define SYSCTL_CLKD_MAX		0x3FF

#define IOV_1V8			1800000		/* 180000 uV */
#define IOV_3V0			3000000		/* 300000 uV */
#define IOV_3V3			3300000		/* 330000 uV */

#define MAX_PHASE_DELAY		0x7C

/* sdhci-omap controller flags */
#define SDHCI_OMAP_REQUIRE_IODELAY	BIT(0)
#define SDHCI_OMAP_SPECIAL_RESET	BIT(1)

struct sdhci_omap_data {
	int omap_offset;	/* Offset for omap regs from base */
	u32 offset;		/* Offset for SDHCI regs from base */
	u8 flags;
};

struct sdhci_omap_host {
	char			*version;
	void __iomem		*base;
	struct device		*dev;
	struct	regulator	*pbias;
	bool			pbias_enabled;
	struct sdhci_host	*host;
	u8			bus_mode;
	u8			power_mode;
	u8			timing;
	u8			flags;

	struct pinctrl		*pinctrl;
	struct pinctrl_state	**pinctrl_state;
	int			wakeirq;
	bool			is_tuning;

	/* Offset for omap specific registers from base */
	int			omap_offset;

	/* Omap specific context save */
	u32			con;
	u32			hctl;
	u32			sysctl;
	u32			capa;
	u32			ie;
	u32			ise;
};

static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host);
static void sdhci_omap_stop_clock(struct sdhci_omap_host *omap_host);

static inline u32 sdhci_omap_readl(struct sdhci_omap_host *host,
				   unsigned int offset)
{
	return readl(host->base + host->omap_offset + offset);
}

static inline void sdhci_omap_writel(struct sdhci_omap_host *host,
				     unsigned int offset, u32 data)
{
	writel(data, host->base + host->omap_offset + offset);
}

static int sdhci_omap_set_pbias(struct sdhci_omap_host *omap_host,
				bool power_on, unsigned int iov)
{
	int ret;
	struct device *dev = omap_host->dev;

	if (IS_ERR(omap_host->pbias))
		return 0;

	if (power_on) {
		ret = regulator_set_voltage(omap_host->pbias, iov, iov);
		if (ret) {
			dev_err(dev, "pbias set voltage failed\n");
			return ret;
		}

		if (omap_host->pbias_enabled)
			return 0;

		ret = regulator_enable(omap_host->pbias);
		if (ret) {
			dev_err(dev, "pbias reg enable fail\n");
			return ret;
		}

		omap_host->pbias_enabled = true;
	} else {
		if (!omap_host->pbias_enabled)
			return 0;

		ret = regulator_disable(omap_host->pbias);
		if (ret) {
			dev_err(dev, "pbias reg disable fail\n");
			return ret;
		}
		omap_host->pbias_enabled = false;
	}

	return 0;
}

static int sdhci_omap_enable_iov(struct sdhci_omap_host *omap_host,
				 unsigned int iov_pbias)
{
	int ret;
	struct sdhci_host *host = omap_host->host;
	struct mmc_host *mmc = host->mmc;

	ret = sdhci_omap_set_pbias(omap_host, false, 0);
	if (ret)
		return ret;

	if (!IS_ERR(mmc->supply.vqmmc)) {
		/* Pick the right voltage to allow 3.0V for 3.3V nominal PBIAS */
		ret = mmc_regulator_set_vqmmc(mmc, &mmc->ios);
		if (ret < 0) {
			dev_err(mmc_dev(mmc), "vqmmc set voltage failed\n");
			return ret;
		}
	}

	ret = sdhci_omap_set_pbias(omap_host, true, iov_pbias);
	if (ret)
		return ret;

	return 0;
}

static void sdhci_omap_conf_bus_power(struct sdhci_omap_host *omap_host,
				      unsigned char signal_voltage)
{
	u32 reg, capa;
	ktime_t timeout;

	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL);
	reg &= ~HCTL_SDVS_MASK;

	switch (signal_voltage) {
	case MMC_SIGNAL_VOLTAGE_330:
		capa = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
		if (capa & CAPA_VS33)
			reg |= HCTL_SDVS_33;
		else if (capa & CAPA_VS30)
			reg |= HCTL_SDVS_30;
		else
			dev_warn(omap_host->dev, "misconfigured CAPA: %08x\n",
				 capa);
		break;
	case MMC_SIGNAL_VOLTAGE_180:
	default:
		reg |= HCTL_SDVS_18;
		break;
	}

	sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, reg);

	reg |= HCTL_SDBP;
	sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, reg);

	/* wait 1ms */
	timeout = ktime_add_ms(ktime_get(), SDHCI_OMAP_TIMEOUT);
	while (1) {
		bool timedout = ktime_after(ktime_get(), timeout);

		if (sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL) & HCTL_SDBP)
			break;
		if (WARN_ON(timedout))
			return;
		usleep_range(5, 10);
	}
}

static void sdhci_omap_enable_sdio_irq(struct mmc_host *mmc, int enable)
{
	struct sdhci_host *host = mmc_priv(mmc);
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
	u32 reg;

	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
	if (enable)
		reg |= (CON_CTPL | CON_CLKEXTFREE);
	else
		reg &= ~(CON_CTPL | CON_CLKEXTFREE);
	sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);

	sdhci_enable_sdio_irq(mmc, enable);
}

static inline void sdhci_omap_set_dll(struct sdhci_omap_host *omap_host,
				      int count)
{
	int i;
	u32 reg;

	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_DLL);
	reg |= DLL_FORCE_VALUE;
	reg &= ~DLL_FORCE_SR_C_MASK;
	reg |= (count << DLL_FORCE_SR_C_SHIFT);
	sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);

	reg |= DLL_CALIB;
	sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);
	for (i = 0; i < 1000; i++) {
		reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_DLL);
		if (reg & DLL_CALIB)
			break;
	}
	reg &= ~DLL_CALIB;
	sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);
}

static void sdhci_omap_disable_tuning(struct sdhci_omap_host *omap_host)
{
	u32 reg;

	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
	reg &= ~AC12_SCLK_SEL;
	sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg);

	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_DLL);
	reg &= ~(DLL_FORCE_VALUE | DLL_SWT);
	sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);
}

static int sdhci_omap_execute_tuning(struct mmc_host *mmc, u32 opcode)
{
	struct sdhci_host *host = mmc_priv(mmc);
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
	struct thermal_zone_device *thermal_dev;
	struct device *dev = omap_host->dev;
	struct mmc_ios *ios = &mmc->ios;
	u32 start_window = 0, max_window = 0;
	bool single_point_failure = false;
	bool dcrc_was_enabled = false;
	u8 cur_match, prev_match = 0;
	u32 length = 0, max_len = 0;
	u32 phase_delay = 0;
	int temperature;
	int ret = 0;
	u32 reg;
	int i;

	/* clock tuning is not needed for upto 52MHz */
	if (ios->clock <= 52000000)
		return 0;

	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA2);
	if (ios->timing == MMC_TIMING_UHS_SDR50 && !(reg & CAPA2_TSDR50))
		return 0;

	thermal_dev = thermal_zone_get_zone_by_name("cpu_thermal");
	if (IS_ERR(thermal_dev)) {
		dev_err(dev, "Unable to get thermal zone for tuning\n");
		return PTR_ERR(thermal_dev);
	}

	ret = thermal_zone_get_temp(thermal_dev, &temperature);
	if (ret)
		return ret;

	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_DLL);
	reg |= DLL_SWT;
	sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);

	/*
	 * OMAP5/DRA74X/DRA72x Errata i802:
	 * DCRC error interrupts (MMCHS_STAT[21] DCRC=0x1) can occur
	 * during the tuning procedure. So disable it during the
	 * tuning procedure.
	 */
	if (host->ier & SDHCI_INT_DATA_CRC) {
		host->ier &= ~SDHCI_INT_DATA_CRC;
		dcrc_was_enabled = true;
	}

	omap_host->is_tuning = true;

	/*
	 * Stage 1: Search for a maximum pass window ignoring any
	 * single point failures. If the tuning value ends up
	 * near it, move away from it in stage 2 below
	 */
	while (phase_delay <= MAX_PHASE_DELAY) {
		sdhci_omap_set_dll(omap_host, phase_delay);

		cur_match = !mmc_send_tuning(mmc, opcode, NULL);
		if (cur_match) {
			if (prev_match) {
				length++;
			} else if (single_point_failure) {
				/* ignore single point failure */
				length++;
			} else {
				start_window = phase_delay;
				length = 1;
			}
		} else {
			single_point_failure = prev_match;
		}

		if (length > max_len) {
			max_window = start_window;
			max_len = length;
		}

		prev_match = cur_match;
		phase_delay += 4;
	}

	if (!max_len) {
		dev_err(dev, "Unable to find match\n");
		ret = -EIO;
		goto tuning_error;
	}

	/*
	 * Assign tuning value as a ratio of maximum pass window based
	 * on temperature
	 */
	if (temperature < -20000)
		phase_delay = min(max_window + 4 * (max_len - 1) - 24,
				  max_window +
				  DIV_ROUND_UP(13 * max_len, 16) * 4);
	else if (temperature < 20000)
		phase_delay = max_window + DIV_ROUND_UP(9 * max_len, 16) * 4;
	else if (temperature < 40000)
		phase_delay = max_window + DIV_ROUND_UP(8 * max_len, 16) * 4;
	else if (temperature < 70000)
		phase_delay = max_window + DIV_ROUND_UP(7 * max_len, 16) * 4;
	else if (temperature < 90000)
		phase_delay = max_window + DIV_ROUND_UP(5 * max_len, 16) * 4;
	else if (temperature < 120000)
		phase_delay = max_window + DIV_ROUND_UP(4 * max_len, 16) * 4;
	else
		phase_delay = max_window + DIV_ROUND_UP(3 * max_len, 16) * 4;

	/*
	 * Stage 2: Search for a single point failure near the chosen tuning
	 * value in two steps. First in the +3 to +10 range and then in the
	 * +2 to -10 range. If found, move away from it in the appropriate
	 * direction by the appropriate amount depending on the temperature.
	 */
	for (i = 3; i <= 10; i++) {
		sdhci_omap_set_dll(omap_host, phase_delay + i);

		if (mmc_send_tuning(mmc, opcode, NULL)) {
			if (temperature < 10000)
				phase_delay += i + 6;
			else if (temperature < 20000)
				phase_delay += i - 12;
			else if (temperature < 70000)
				phase_delay += i - 8;
			else
				phase_delay += i - 6;

			goto single_failure_found;
		}
	}

	for (i = 2; i >= -10; i--) {
		sdhci_omap_set_dll(omap_host, phase_delay + i);

		if (mmc_send_tuning(mmc, opcode, NULL)) {
			if (temperature < 10000)
				phase_delay += i + 12;
			else if (temperature < 20000)
				phase_delay += i + 8;
			else if (temperature < 70000)
				phase_delay += i + 8;
			else if (temperature < 90000)
				phase_delay += i + 10;
			else
				phase_delay += i + 12;

			goto single_failure_found;
		}
	}

single_failure_found:
	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
	if (!(reg & AC12_SCLK_SEL)) {
		ret = -EIO;
		goto tuning_error;
	}

	sdhci_omap_set_dll(omap_host, phase_delay);

	omap_host->is_tuning = false;

	goto ret;

tuning_error:
	omap_host->is_tuning = false;
	dev_err(dev, "Tuning failed\n");
	sdhci_omap_disable_tuning(omap_host);

ret:
	sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
	/* Reenable forbidden interrupt */
	if (dcrc_was_enabled)
		host->ier |= SDHCI_INT_DATA_CRC;
	sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
	sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
	return ret;
}

static int sdhci_omap_card_busy(struct mmc_host *mmc)
{
	u32 reg, ac12;
	int ret = false;
	struct sdhci_host *host = mmc_priv(mmc);
	struct sdhci_pltfm_host *pltfm_host;
	struct sdhci_omap_host *omap_host;
	u32 ier = host->ier;

	pltfm_host = sdhci_priv(host);
	omap_host = sdhci_pltfm_priv(pltfm_host);

	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
	ac12 = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
	reg &= ~CON_CLKEXTFREE;
	if (ac12 & AC12_V1V8_SIGEN)
		reg |= CON_CLKEXTFREE;
	reg |= CON_PADEN;
	sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);

	disable_irq(host->irq);
	ier |= SDHCI_INT_CARD_INT;
	sdhci_writel(host, ier, SDHCI_INT_ENABLE);
	sdhci_writel(host, ier, SDHCI_SIGNAL_ENABLE);

	/*
	 * Delay is required for PSTATE to correctly reflect
	 * DLEV/CLEV values after PADEN is set.
	 */
	usleep_range(50, 100);
	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_PSTATE);
	if ((reg & PSTATE_DATI) || !(reg & PSTATE_DLEV_DAT0))
		ret = true;

	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
	reg &= ~(CON_CLKEXTFREE | CON_PADEN);
	sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);

	sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
	sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
	enable_irq(host->irq);

	return ret;
}

static int sdhci_omap_start_signal_voltage_switch(struct mmc_host *mmc,
						  struct mmc_ios *ios)
{
	u32 reg;
	int ret;
	unsigned int iov;
	struct sdhci_host *host = mmc_priv(mmc);
	struct sdhci_pltfm_host *pltfm_host;
	struct sdhci_omap_host *omap_host;
	struct device *dev;

	pltfm_host = sdhci_priv(host);
	omap_host = sdhci_pltfm_priv(pltfm_host);
	dev = omap_host->dev;

	if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
		reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
		if (!(reg & (CAPA_VS30 | CAPA_VS33)))
			return -EOPNOTSUPP;

		if (reg & CAPA_VS30)
			iov = IOV_3V0;
		else
			iov = IOV_3V3;

		sdhci_omap_conf_bus_power(omap_host, ios->signal_voltage);

		reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
		reg &= ~AC12_V1V8_SIGEN;
		sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg);

	} else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
		reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
		if (!(reg & CAPA_VS18))
			return -EOPNOTSUPP;

		iov = IOV_1V8;

		sdhci_omap_conf_bus_power(omap_host, ios->signal_voltage);

		reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
		reg |= AC12_V1V8_SIGEN;
		sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg);
	} else {
		return -EOPNOTSUPP;
	}

	ret = sdhci_omap_enable_iov(omap_host, iov);
	if (ret) {
		dev_err(dev, "failed to switch IO voltage to %dmV\n", iov);
		return ret;
	}

	dev_dbg(dev, "IO voltage switched to %dmV\n", iov);
	return 0;
}

static void sdhci_omap_set_timing(struct sdhci_omap_host *omap_host, u8 timing)
{
	int ret;
	struct pinctrl_state *pinctrl_state;
	struct device *dev = omap_host->dev;

	if (!(omap_host->flags & SDHCI_OMAP_REQUIRE_IODELAY))
		return;

	if (omap_host->timing == timing)
		return;

	sdhci_omap_stop_clock(omap_host);

	pinctrl_state = omap_host->pinctrl_state[timing];
	ret = pinctrl_select_state(omap_host->pinctrl, pinctrl_state);
	if (ret) {
		dev_err(dev, "failed to select pinctrl state\n");
		return;
	}

	sdhci_omap_start_clock(omap_host);
	omap_host->timing = timing;
}

static void sdhci_omap_set_power_mode(struct sdhci_omap_host *omap_host,
				      u8 power_mode)
{
	if (omap_host->bus_mode == MMC_POWER_OFF)
		sdhci_omap_disable_tuning(omap_host);
	omap_host->power_mode = power_mode;
}

static void sdhci_omap_set_bus_mode(struct sdhci_omap_host *omap_host,
				    unsigned int mode)
{
	u32 reg;

	if (omap_host->bus_mode == mode)
		return;

	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
	if (mode == MMC_BUSMODE_OPENDRAIN)
		reg |= CON_OD;
	else
		reg &= ~CON_OD;
	sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);

	omap_host->bus_mode = mode;
}

static void sdhci_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
	struct sdhci_host *host = mmc_priv(mmc);
	struct sdhci_pltfm_host *pltfm_host;
	struct sdhci_omap_host *omap_host;

	pltfm_host = sdhci_priv(host);
	omap_host = sdhci_pltfm_priv(pltfm_host);

	sdhci_omap_set_bus_mode(omap_host, ios->bus_mode);
	sdhci_omap_set_timing(omap_host, ios->timing);
	sdhci_set_ios(mmc, ios);
	sdhci_omap_set_power_mode(omap_host, ios->power_mode);
}

static u16 sdhci_omap_calc_divisor(struct sdhci_pltfm_host *host,
				   unsigned int clock)
{
	u16 dsor;

	dsor = DIV_ROUND_UP(clk_get_rate(host->clk), clock);
	if (dsor > SYSCTL_CLKD_MAX)
		dsor = SYSCTL_CLKD_MAX;

	return dsor;
}

static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host)
{
	u32 reg;

	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL);
	reg |= SYSCTL_CEN;
	sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, reg);
}

static void sdhci_omap_stop_clock(struct sdhci_omap_host *omap_host)
{
	u32 reg;

	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL);
	reg &= ~SYSCTL_CEN;
	sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, reg);
}

static void sdhci_omap_set_clock(struct sdhci_host *host, unsigned int clock)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
	unsigned long clkdiv;

	sdhci_omap_stop_clock(omap_host);

	if (!clock)
		return;

	clkdiv = sdhci_omap_calc_divisor(pltfm_host, clock);
	clkdiv = (clkdiv & SYSCTL_CLKD_MASK) << SYSCTL_CLKD_SHIFT;
	sdhci_enable_clk(host, clkdiv);

	sdhci_omap_start_clock(omap_host);
}

static void sdhci_omap_set_power(struct sdhci_host *host, unsigned char mode,
			  unsigned short vdd)
{
	struct mmc_host *mmc = host->mmc;

	if (!IS_ERR(mmc->supply.vmmc))
		mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
}

/*
 * MMCHS_HL_HWINFO has the MADMA_EN bit set if the controller instance
 * is connected to L3 interconnect and is bus master capable. Note that
 * the MMCHS_HL_HWINFO register is in the module registers before the
 * omap registers and sdhci registers. The offset can vary for omap
 * registers depending on the SoC. Do not use sdhci_omap_readl() here.
 */
static bool sdhci_omap_has_adma(struct sdhci_omap_host *omap_host, int offset)
{
	/* MMCHS_HL_HWINFO register is only available on omap4 and later */
	if (offset < 0x200)
		return false;

	return readl(omap_host->base + 4) & 1;
}

static int sdhci_omap_enable_dma(struct sdhci_host *host)
{
	u32 reg;
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);

	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
	reg &= ~CON_DMA_MASTER;
	/* Switch to DMA slave mode when using external DMA */
	if (!host->use_external_dma)
		reg |= CON_DMA_MASTER;

	sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);

	return 0;
}

static unsigned int sdhci_omap_get_min_clock(struct sdhci_host *host)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	return clk_get_rate(pltfm_host->clk) / SYSCTL_CLKD_MAX;
}

static void sdhci_omap_set_bus_width(struct sdhci_host *host, int width)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
	u32 reg;

	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
	if (width == MMC_BUS_WIDTH_8)
		reg |= CON_DW8;
	else
		reg &= ~CON_DW8;
	sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);

	sdhci_set_bus_width(host, width);
}

static void sdhci_omap_init_74_clocks(struct sdhci_host *host, u8 power_mode)
{
	u32 reg;
	ktime_t timeout;
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);

	if (omap_host->power_mode == power_mode)
		return;

	if (power_mode != MMC_POWER_ON)
		return;

	disable_irq(host->irq);

	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
	reg |= CON_INIT;
	sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
	sdhci_omap_writel(omap_host, SDHCI_OMAP_CMD, 0x0);

	/* wait 1ms */
	timeout = ktime_add_ms(ktime_get(), SDHCI_OMAP_TIMEOUT);
	while (1) {
		bool timedout = ktime_after(ktime_get(), timeout);

		if (sdhci_omap_readl(omap_host, SDHCI_OMAP_STAT) & INT_CC_EN)
			break;
		if (WARN_ON(timedout))
			return;
		usleep_range(5, 10);
	}

	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
	reg &= ~CON_INIT;
	sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
	sdhci_omap_writel(omap_host, SDHCI_OMAP_STAT, INT_CC_EN);

	enable_irq(host->irq);
}

static void sdhci_omap_set_uhs_signaling(struct sdhci_host *host,
					 unsigned int timing)
{
	u32 reg;
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);

	sdhci_omap_stop_clock(omap_host);

	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
	if (timing == MMC_TIMING_UHS_DDR50 || timing == MMC_TIMING_MMC_DDR52)
		reg |= CON_DDR;
	else
		reg &= ~CON_DDR;
	sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);

	sdhci_set_uhs_signaling(host, timing);
	sdhci_omap_start_clock(omap_host);
}

#define MMC_TIMEOUT_US		20000		/* 20000 micro Sec */
static void sdhci_omap_reset(struct sdhci_host *host, u8 mask)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
	unsigned long limit = MMC_TIMEOUT_US;
	unsigned long i = 0;
	u32 sysc;

	/* Save target module sysconfig configured by SoC PM layer */
	if (mask & SDHCI_RESET_ALL)
		sysc = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCONFIG);

	/* Don't reset data lines during tuning operation */
	if (omap_host->is_tuning)
		mask &= ~SDHCI_RESET_DATA;

	if (omap_host->flags & SDHCI_OMAP_SPECIAL_RESET) {
		sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
		while ((!(sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask)) &&
		       (i++ < limit))
			udelay(1);
		i = 0;
		while ((sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) &&
		       (i++ < limit))
			udelay(1);

		if (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask)
			dev_err(mmc_dev(host->mmc),
				"Timeout waiting on controller reset in %s\n",
				__func__);

		goto restore_sysc;
	}

	sdhci_reset(host, mask);

restore_sysc:
	if (mask & SDHCI_RESET_ALL)
		sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCONFIG, sysc);
}

#define CMD_ERR_MASK (SDHCI_INT_CRC | SDHCI_INT_END_BIT | SDHCI_INT_INDEX |\
		      SDHCI_INT_TIMEOUT)
#define CMD_MASK (CMD_ERR_MASK | SDHCI_INT_RESPONSE)

static u32 sdhci_omap_irq(struct sdhci_host *host, u32 intmask)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);

	if (omap_host->is_tuning && host->cmd && !host->data_early &&
	    (intmask & CMD_ERR_MASK)) {

		/*
		 * Since we are not resetting data lines during tuning
		 * operation, data error or data complete interrupts
		 * might still arrive. Mark this request as a failure
		 * but still wait for the data interrupt
		 */
		if (intmask & SDHCI_INT_TIMEOUT)
			host->cmd->error = -ETIMEDOUT;
		else
			host->cmd->error = -EILSEQ;

		host->cmd = NULL;

		/*
		 * Sometimes command error interrupts and command complete
		 * interrupt will arrive together. Clear all command related
		 * interrupts here.
		 */
		sdhci_writel(host, intmask & CMD_MASK, SDHCI_INT_STATUS);
		intmask &= ~CMD_MASK;
	}

	return intmask;
}

static void sdhci_omap_set_timeout(struct sdhci_host *host,
				   struct mmc_command *cmd)
{
	if (cmd->opcode == MMC_ERASE)
		sdhci_set_data_timeout_irq(host, false);

	__sdhci_set_timeout(host, cmd);
}

static const struct sdhci_ops sdhci_omap_ops = {
	.set_clock = sdhci_omap_set_clock,
	.set_power = sdhci_omap_set_power,
	.enable_dma = sdhci_omap_enable_dma,
	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
	.get_min_clock = sdhci_omap_get_min_clock,
	.set_bus_width = sdhci_omap_set_bus_width,
	.platform_send_init_74_clocks = sdhci_omap_init_74_clocks,
	.reset = sdhci_omap_reset,
	.set_uhs_signaling = sdhci_omap_set_uhs_signaling,
	.irq = sdhci_omap_irq,
	.set_timeout = sdhci_omap_set_timeout,
};

static unsigned int sdhci_omap_regulator_get_caps(struct device *dev,
						  const char *name)
{
	struct regulator *reg;
	unsigned int caps = 0;

	reg = regulator_get(dev, name);
	if (IS_ERR(reg))
		return ~0U;

	if (regulator_is_supported_voltage(reg, 1700000, 1950000))
		caps |= SDHCI_CAN_VDD_180;
	if (regulator_is_supported_voltage(reg, 2700000, 3150000))
		caps |= SDHCI_CAN_VDD_300;
	if (regulator_is_supported_voltage(reg, 3150000, 3600000))
		caps |= SDHCI_CAN_VDD_330;

	regulator_put(reg);

	return caps;
}

static int sdhci_omap_set_capabilities(struct sdhci_host *host)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
	struct device *dev = omap_host->dev;
	const u32 mask = SDHCI_CAN_VDD_180 | SDHCI_CAN_VDD_300 | SDHCI_CAN_VDD_330;
	unsigned int pbias, vqmmc, caps = 0;
	u32 reg;

	pbias = sdhci_omap_regulator_get_caps(dev, "pbias");
	vqmmc = sdhci_omap_regulator_get_caps(dev, "vqmmc");
	caps = pbias & vqmmc;

	if (pbias != ~0U && vqmmc == ~0U)
		dev_warn(dev, "vqmmc regulator missing for pbias\n");
	else if (caps == ~0U)
		return 0;

	/*
	 * Quirk handling to allow 3.0V vqmmc with a valid 3.3V PBIAS. This is
	 * needed for 3.0V ldo9_reg on omap5 at least.
	 */
	if (pbias != ~0U && (pbias & SDHCI_CAN_VDD_330) &&
	    (vqmmc & SDHCI_CAN_VDD_300))
		caps |= SDHCI_CAN_VDD_330;

	/* voltage capabilities might be set by boot loader, clear it */
	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
	reg &= ~(CAPA_VS18 | CAPA_VS30 | CAPA_VS33);

	if (caps & SDHCI_CAN_VDD_180)
		reg |= CAPA_VS18;

	if (caps & SDHCI_CAN_VDD_300)
		reg |= CAPA_VS30;

	if (caps & SDHCI_CAN_VDD_330)
		reg |= CAPA_VS33;

	sdhci_omap_writel(omap_host, SDHCI_OMAP_CAPA, reg);

	host->caps &= ~mask;
	host->caps |= caps;

	return 0;
}

static const struct sdhci_pltfm_data sdhci_omap_pdata = {
	.quirks = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
		  SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
		  SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
		  SDHCI_QUIRK_NO_HISPD_BIT |
		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
	.quirks2 = SDHCI_QUIRK2_ACMD23_BROKEN |
		   SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
		   SDHCI_QUIRK2_RSP_136_HAS_CRC |
		   SDHCI_QUIRK2_DISABLE_HW_TIMEOUT,
	.ops = &sdhci_omap_ops,
};

static const struct sdhci_omap_data omap2430_data = {
	.omap_offset = 0,
	.offset = 0x100,
};

static const struct sdhci_omap_data omap3_data = {
	.omap_offset = 0,
	.offset = 0x100,
};

static const struct sdhci_omap_data omap4_data = {
	.omap_offset = 0x100,
	.offset = 0x200,
	.flags = SDHCI_OMAP_SPECIAL_RESET,
};

static const struct sdhci_omap_data omap5_data = {
	.omap_offset = 0x100,
	.offset = 0x200,
	.flags = SDHCI_OMAP_SPECIAL_RESET,
};

static const struct sdhci_omap_data k2g_data = {
	.omap_offset = 0x100,
	.offset = 0x200,
};

static const struct sdhci_omap_data am335_data = {
	.omap_offset = 0x100,
	.offset = 0x200,
	.flags = SDHCI_OMAP_SPECIAL_RESET,
};

static const struct sdhci_omap_data am437_data = {
	.omap_offset = 0x100,
	.offset = 0x200,
	.flags = SDHCI_OMAP_SPECIAL_RESET,
};

static const struct sdhci_omap_data dra7_data = {
	.omap_offset = 0x100,
	.offset = 0x200,
	.flags	= SDHCI_OMAP_REQUIRE_IODELAY,
};

static const struct of_device_id omap_sdhci_match[] = {
	{ .compatible = "ti,omap2430-sdhci", .data = &omap2430_data },
	{ .compatible = "ti,omap3-sdhci", .data = &omap3_data },
	{ .compatible = "ti,omap4-sdhci", .data = &omap4_data },
	{ .compatible = "ti,omap5-sdhci", .data = &omap5_data },
	{ .compatible = "ti,dra7-sdhci", .data = &dra7_data },
	{ .compatible = "ti,k2g-sdhci", .data = &k2g_data },
	{ .compatible = "ti,am335-sdhci", .data = &am335_data },
	{ .compatible = "ti,am437-sdhci", .data = &am437_data },
	{},
};
MODULE_DEVICE_TABLE(of, omap_sdhci_match);

static struct pinctrl_state
*sdhci_omap_iodelay_pinctrl_state(struct sdhci_omap_host *omap_host, char *mode,
				  u32 *caps, u32 capmask)
{
	struct device *dev = omap_host->dev;
	char *version = omap_host->version;
	struct pinctrl_state *pinctrl_state = ERR_PTR(-ENODEV);
	char str[20];

	if (!(*caps & capmask))
		goto ret;

	if (version) {
		snprintf(str, 20, "%s-%s", mode, version);
		pinctrl_state = pinctrl_lookup_state(omap_host->pinctrl, str);
	}

	if (IS_ERR(pinctrl_state))
		pinctrl_state = pinctrl_lookup_state(omap_host->pinctrl, mode);

	if (IS_ERR(pinctrl_state)) {
		dev_err(dev, "no pinctrl state for %s mode", mode);
		*caps &= ~capmask;
	}

ret:
	return pinctrl_state;
}

static int sdhci_omap_config_iodelay_pinctrl_state(struct sdhci_omap_host
						   *omap_host)
{
	struct device *dev = omap_host->dev;
	struct sdhci_host *host = omap_host->host;
	struct mmc_host *mmc = host->mmc;
	u32 *caps = &mmc->caps;
	u32 *caps2 = &mmc->caps2;
	struct pinctrl_state *state;
	struct pinctrl_state **pinctrl_state;

	if (!(omap_host->flags & SDHCI_OMAP_REQUIRE_IODELAY))
		return 0;

	pinctrl_state = devm_kcalloc(dev,
				     MMC_TIMING_MMC_HS200 + 1,
				     sizeof(*pinctrl_state),
				     GFP_KERNEL);
	if (!pinctrl_state)
		return -ENOMEM;

	omap_host->pinctrl = devm_pinctrl_get(omap_host->dev);
	if (IS_ERR(omap_host->pinctrl)) {
		dev_err(dev, "Cannot get pinctrl\n");
		return PTR_ERR(omap_host->pinctrl);
	}

	state = pinctrl_lookup_state(omap_host->pinctrl, "default");
	if (IS_ERR(state)) {
		dev_err(dev, "no pinctrl state for default mode\n");
		return PTR_ERR(state);
	}
	pinctrl_state[MMC_TIMING_LEGACY] = state;

	state = sdhci_omap_iodelay_pinctrl_state(omap_host, "sdr104", caps,
						 MMC_CAP_UHS_SDR104);
	if (!IS_ERR(state))
		pinctrl_state[MMC_TIMING_UHS_SDR104] = state;

	state = sdhci_omap_iodelay_pinctrl_state(omap_host, "ddr50", caps,
						 MMC_CAP_UHS_DDR50);
	if (!IS_ERR(state))
		pinctrl_state[MMC_TIMING_UHS_DDR50] = state;

	state = sdhci_omap_iodelay_pinctrl_state(omap_host, "sdr50", caps,
						 MMC_CAP_UHS_SDR50);
	if (!IS_ERR(state))
		pinctrl_state[MMC_TIMING_UHS_SDR50] = state;

	state = sdhci_omap_iodelay_pinctrl_state(omap_host, "sdr25", caps,
						 MMC_CAP_UHS_SDR25);
	if (!IS_ERR(state))
		pinctrl_state[MMC_TIMING_UHS_SDR25] = state;

	state = sdhci_omap_iodelay_pinctrl_state(omap_host, "sdr12", caps,
						 MMC_CAP_UHS_SDR12);
	if (!IS_ERR(state))
		pinctrl_state[MMC_TIMING_UHS_SDR12] = state;

	state = sdhci_omap_iodelay_pinctrl_state(omap_host, "ddr_1_8v", caps,
						 MMC_CAP_1_8V_DDR);
	if (!IS_ERR(state)) {
		pinctrl_state[MMC_TIMING_MMC_DDR52] = state;
	} else {
		state = sdhci_omap_iodelay_pinctrl_state(omap_host, "ddr_3_3v",
							 caps,
							 MMC_CAP_3_3V_DDR);
		if (!IS_ERR(state))
			pinctrl_state[MMC_TIMING_MMC_DDR52] = state;
	}

	state = sdhci_omap_iodelay_pinctrl_state(omap_host, "hs", caps,
						 MMC_CAP_SD_HIGHSPEED);
	if (!IS_ERR(state))
		pinctrl_state[MMC_TIMING_SD_HS] = state;

	state = sdhci_omap_iodelay_pinctrl_state(omap_host, "hs", caps,
						 MMC_CAP_MMC_HIGHSPEED);
	if (!IS_ERR(state))
		pinctrl_state[MMC_TIMING_MMC_HS] = state;

	state = sdhci_omap_iodelay_pinctrl_state(omap_host, "hs200_1_8v", caps2,
						 MMC_CAP2_HS200_1_8V_SDR);
	if (!IS_ERR(state))
		pinctrl_state[MMC_TIMING_MMC_HS200] = state;

	omap_host->pinctrl_state = pinctrl_state;

	return 0;
}

static const struct soc_device_attribute sdhci_omap_soc_devices[] = {
	{
		.machine = "DRA7[45]*",
		.revision = "ES1.[01]",
	},
	{
		/* sentinel */
	}
};

static int sdhci_omap_probe(struct platform_device *pdev)
{
	int ret;
	u32 offset;
	struct device *dev = &pdev->dev;
	struct sdhci_host *host;
	struct sdhci_pltfm_host *pltfm_host;
	struct sdhci_omap_host *omap_host;
	struct mmc_host *mmc;
	const struct sdhci_omap_data *data;
	const struct soc_device_attribute *soc;
	struct resource *regs;

	data = of_device_get_match_data(&pdev->dev);
	if (!data) {
		dev_err(dev, "no sdhci omap data\n");
		return -EINVAL;
	}
	offset = data->offset;

	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!regs)
		return -ENXIO;

	host = sdhci_pltfm_init(pdev, &sdhci_omap_pdata,
				sizeof(*omap_host));
	if (IS_ERR(host)) {
		dev_err(dev, "Failed sdhci_pltfm_init\n");
		return PTR_ERR(host);
	}

	pltfm_host = sdhci_priv(host);
	omap_host = sdhci_pltfm_priv(pltfm_host);
	omap_host->host = host;
	omap_host->base = host->ioaddr;
	omap_host->dev = dev;
	omap_host->power_mode = MMC_POWER_UNDEFINED;
	omap_host->timing = MMC_TIMING_LEGACY;
	omap_host->flags = data->flags;
	omap_host->omap_offset = data->omap_offset;
	omap_host->con = -EINVAL; /* Prevent invalid restore on first resume */
	host->ioaddr += offset;
	host->mapbase = regs->start + offset;

	mmc = host->mmc;
	sdhci_get_of_property(pdev);
	ret = mmc_of_parse(mmc);
	if (ret)
		return ret;

	soc = soc_device_match(sdhci_omap_soc_devices);
	if (soc) {
		omap_host->version = "rev11";
		if (!strcmp(dev_name(dev), "4809c000.mmc"))
			mmc->f_max = 96000000;
		if (!strcmp(dev_name(dev), "480b4000.mmc"))
			mmc->f_max = 48000000;
		if (!strcmp(dev_name(dev), "480ad000.mmc"))
			mmc->f_max = 48000000;
	}

	if (!mmc_host_can_gpio_ro(mmc))
		mmc->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;

	pltfm_host->clk = devm_clk_get(dev, "fck");
	if (IS_ERR(pltfm_host->clk))
		return PTR_ERR(pltfm_host->clk);

	ret = clk_set_rate(pltfm_host->clk, mmc->f_max);
	if (ret)
		return dev_err_probe(dev, ret,
				     "failed to set clock to %d\n", mmc->f_max);

	omap_host->pbias = devm_regulator_get_optional(dev, "pbias");
	if (IS_ERR(omap_host->pbias)) {
		ret = PTR_ERR(omap_host->pbias);
		if (ret != -ENODEV)
			return ret;
		dev_dbg(dev, "unable to get pbias regulator %d\n", ret);
	}
	omap_host->pbias_enabled = false;

	/*
	 * omap_device_pm_domain has callbacks to enable the main
	 * functional clock, interface clock and also configure the
	 * SYSCONFIG register to clear any boot loader set voltage
	 * capabilities before calling sdhci_setup_host(). The
	 * callback will be invoked as part of pm_runtime_get_sync.
	 */
	pm_runtime_use_autosuspend(dev);
	pm_runtime_set_autosuspend_delay(dev, 50);
	pm_runtime_enable(dev);
	ret = pm_runtime_resume_and_get(dev);
	if (ret) {
		dev_err(dev, "pm_runtime_get_sync failed\n");
		goto err_rpm_disable;
	}

	ret = sdhci_omap_set_capabilities(host);
	if (ret) {
		dev_err(dev, "failed to set system capabilities\n");
		goto err_rpm_put;
	}

	host->mmc_host_ops.start_signal_voltage_switch =
					sdhci_omap_start_signal_voltage_switch;
	host->mmc_host_ops.set_ios = sdhci_omap_set_ios;
	host->mmc_host_ops.card_busy = sdhci_omap_card_busy;
	host->mmc_host_ops.execute_tuning = sdhci_omap_execute_tuning;
	host->mmc_host_ops.enable_sdio_irq = sdhci_omap_enable_sdio_irq;

	/*
	 * Switch to external DMA only if there is the "dmas" property and
	 * ADMA is not available on the controller instance.
	 */
	if (device_property_present(dev, "dmas") &&
	    !sdhci_omap_has_adma(omap_host, offset))
		sdhci_switch_external_dma(host, true);

	if (device_property_read_bool(dev, "ti,non-removable")) {
		dev_warn_once(dev, "using old ti,non-removable property\n");
		mmc->caps |= MMC_CAP_NONREMOVABLE;
	}

	/* R1B responses is required to properly manage HW busy detection. */
	mmc->caps |= MMC_CAP_NEED_RSP_BUSY;

	/*  Enable SDIO card power off. */
	mmc->caps |= MMC_CAP_POWER_OFF_CARD;

	ret = sdhci_setup_host(host);
	if (ret)
		goto err_rpm_put;

	ret = sdhci_omap_config_iodelay_pinctrl_state(omap_host);
	if (ret)
		goto err_cleanup_host;

	ret = __sdhci_add_host(host);
	if (ret)
		goto err_cleanup_host;

	/*
	 * SDIO devices can use the dat1 pin as a wake-up interrupt. Some
	 * devices like wl1xxx, use an out-of-band GPIO interrupt instead.
	 */
	omap_host->wakeirq = of_irq_get_byname(dev->of_node, "wakeup");
	if (omap_host->wakeirq == -EPROBE_DEFER) {
		ret = -EPROBE_DEFER;
		goto err_cleanup_host;
	}
	if (omap_host->wakeirq > 0) {
		device_init_wakeup(dev, true);
		ret = dev_pm_set_dedicated_wake_irq(dev, omap_host->wakeirq);
		if (ret) {
			device_init_wakeup(dev, false);
			goto err_cleanup_host;
		}
		host->mmc->pm_caps |= MMC_PM_KEEP_POWER | MMC_PM_WAKE_SDIO_IRQ;
	}

	pm_runtime_put_autosuspend(dev);

	return 0;

err_cleanup_host:
	sdhci_cleanup_host(host);

err_rpm_put:
	pm_runtime_put_autosuspend(dev);
err_rpm_disable:
	pm_runtime_dont_use_autosuspend(dev);
	pm_runtime_disable(dev);
	return ret;
}

static void sdhci_omap_remove(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct sdhci_host *host = platform_get_drvdata(pdev);

	pm_runtime_get_sync(dev);
	sdhci_remove_host(host, true);
	device_init_wakeup(dev, false);
	dev_pm_clear_wake_irq(dev);
	pm_runtime_dont_use_autosuspend(dev);
	pm_runtime_put_sync(dev);
	/* Ensure device gets disabled despite userspace sysfs config */
	pm_runtime_force_suspend(dev);
}

static void sdhci_omap_context_save(struct sdhci_omap_host *omap_host)
{
	omap_host->con = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
	omap_host->hctl = sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL);
	omap_host->sysctl = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL);
	omap_host->capa = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
	omap_host->ie = sdhci_omap_readl(omap_host, SDHCI_OMAP_IE);
	omap_host->ise = sdhci_omap_readl(omap_host, SDHCI_OMAP_ISE);
}

/* Order matters here, HCTL must be restored in two phases */
static void sdhci_omap_context_restore(struct sdhci_omap_host *omap_host)
{
	sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, omap_host->hctl);
	sdhci_omap_writel(omap_host, SDHCI_OMAP_CAPA, omap_host->capa);
	sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, omap_host->hctl);

	sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, omap_host->sysctl);
	sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, omap_host->con);
	sdhci_omap_writel(omap_host, SDHCI_OMAP_IE, omap_host->ie);
	sdhci_omap_writel(omap_host, SDHCI_OMAP_ISE, omap_host->ise);
}

static int sdhci_omap_runtime_suspend(struct device *dev)
{
	struct sdhci_host *host = dev_get_drvdata(dev);
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);

	if (host->tuning_mode != SDHCI_TUNING_MODE_3)
		mmc_retune_needed(host->mmc);

	if (omap_host->con != -EINVAL)
		sdhci_runtime_suspend_host(host);

	sdhci_omap_context_save(omap_host);

	pinctrl_pm_select_idle_state(dev);

	return 0;
}

static int sdhci_omap_runtime_resume(struct device *dev)
{
	struct sdhci_host *host = dev_get_drvdata(dev);
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);

	pinctrl_pm_select_default_state(dev);

	if (omap_host->con != -EINVAL) {
		sdhci_omap_context_restore(omap_host);
		sdhci_runtime_resume_host(host, 0);
	}

	return 0;
}

static const struct dev_pm_ops sdhci_omap_dev_pm_ops = {
	RUNTIME_PM_OPS(sdhci_omap_runtime_suspend, sdhci_omap_runtime_resume, NULL)
	SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume)
};

static struct platform_driver sdhci_omap_driver = {
	.probe = sdhci_omap_probe,
	.remove = sdhci_omap_remove,
	.driver = {
		   .name = "sdhci-omap",
		   .probe_type = PROBE_PREFER_ASYNCHRONOUS,
		   .pm = pm_ptr(&sdhci_omap_dev_pm_ops),
		   .of_match_table = omap_sdhci_match,
		  },
};

module_platform_driver(sdhci_omap_driver);

MODULE_DESCRIPTION("SDHCI driver for OMAP SoCs");
MODULE_AUTHOR("Texas Instruments Inc.");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:sdhci_omap");