drivers/mmc/am654_sdhci.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
  *
  * Texas Instruments' K3 SD Host Controller Interface
  */

 #include <clk.h>
 #include <common.h>
 #include <dm.h>
 #include <malloc.h>
 #include <power-domain.h>
 #include <regmap.h>
 #include <sdhci.h>
 #include <dm/device_compat.h>
 #include <linux/bitops.h>
 #include <linux/err.h>

 /* CTL_CFG Registers */
 #define CTL_CFG_2		0x14

 #define SLOTTYPE_MASK		GENMASK(31, 30)
 #define SLOTTYPE_EMBEDDED	BIT(30)

 /* PHY Registers */
 #define PHY_CTRL1	0x100
 #define PHY_CTRL2	0x104
 #define PHY_CTRL3	0x108
 #define PHY_CTRL4	0x10C
 #define PHY_CTRL5	0x110
 #define PHY_CTRL6	0x114
 #define PHY_STAT1	0x130
 #define PHY_STAT2	0x134

 #define IOMUX_ENABLE_SHIFT	31
 #define IOMUX_ENABLE_MASK	BIT(IOMUX_ENABLE_SHIFT)
 #define OTAPDLYENA_SHIFT	20
 #define OTAPDLYENA_MASK		BIT(OTAPDLYENA_SHIFT)
 #define OTAPDLYSEL_SHIFT	12
 #define OTAPDLYSEL_MASK		GENMASK(15, 12)
 #define STRBSEL_SHIFT		24
 #define STRBSEL_4BIT_MASK	GENMASK(27, 24)
 #define STRBSEL_8BIT_MASK	GENMASK(31, 24)
 #define SEL50_SHIFT		8
 #define SEL50_MASK		BIT(SEL50_SHIFT)
 #define SEL100_SHIFT		9
 #define SEL100_MASK		BIT(SEL100_SHIFT)
 #define FREQSEL_SHIFT		8
 #define FREQSEL_MASK		GENMASK(10, 8)
 #define DLL_TRIM_ICP_SHIFT	4
 #define DLL_TRIM_ICP_MASK	GENMASK(7, 4)
 #define DR_TY_SHIFT		20
 #define DR_TY_MASK		GENMASK(22, 20)
 #define ENDLL_SHIFT		1
 #define ENDLL_MASK		BIT(ENDLL_SHIFT)
 #define DLLRDY_SHIFT		0
 #define DLLRDY_MASK		BIT(DLLRDY_SHIFT)
 #define PDB_SHIFT		0
 #define PDB_MASK		BIT(PDB_SHIFT)
 #define CALDONE_SHIFT		1
 #define CALDONE_MASK		BIT(CALDONE_SHIFT)
 #define RETRIM_SHIFT		17
 #define RETRIM_MASK		BIT(RETRIM_SHIFT)

 #define DRIVER_STRENGTH_50_OHM	0x0
 #define DRIVER_STRENGTH_33_OHM	0x1
 #define DRIVER_STRENGTH_66_OHM	0x2
 #define DRIVER_STRENGTH_100_OHM	0x3
 #define DRIVER_STRENGTH_40_OHM	0x4

 #define AM654_SDHCI_MIN_FREQ	400000

 struct am654_sdhci_plat {
 	struct mmc_config cfg;
 	struct mmc mmc;
 	struct regmap *base;
 	bool non_removable;
 	u32 otap_del_sel[MMC_MODES_END];
 	u32 trm_icp;
 	u32 drv_strength;
 	u32 strb_sel;
 	u32 flags;
 #define DLL_PRESENT	(1 << 0)
 #define IOMUX_PRESENT	(1 << 1)
 #define FREQSEL_2_BIT	(1 << 2)
 #define STRBSEL_4_BIT	(1 << 3)
 	bool dll_on;
 };

 struct timing_data {
 	const char *binding;
 	u32 capability;
 };

 static const struct timing_data td[] = {
 	[MMC_LEGACY] = {"ti,otap-del-sel-legacy", 0},
 	[MMC_HS] = {"ti,otap-del-sel-mmc-hs", MMC_CAP(MMC_HS)},
 	[SD_HS]  = {"ti,otap-del-sel-sd-hs", MMC_CAP(SD_HS)},
 	[UHS_SDR12] = {"ti,otap-del-sel-sdr12", MMC_CAP(UHS_SDR12)},
 	[UHS_SDR25] = {"ti,otap-del-sel-sdr25", MMC_CAP(UHS_SDR25)},
 	[UHS_SDR50] = {"ti,otap-del-sel-sdr50", MMC_CAP(UHS_SDR50)},
 	[UHS_SDR104] = {"ti,otap-del-sel-sdr104", MMC_CAP(UHS_SDR104)},
 	[UHS_DDR50] = {"ti,otap-del-sel-ddr50", MMC_CAP(UHS_DDR50)},
 	[MMC_DDR_52] = {"ti,otap-del-sel-ddr52", MMC_CAP(MMC_DDR_52)},
 	[MMC_HS_200] = {"ti,otap-del-sel-hs200", MMC_CAP(MMC_HS_200)},
 	[MMC_HS_400] = {"ti,otap-del-sel-hs400", MMC_CAP(MMC_HS_400)},
 };

 struct am654_driver_data {
 	const struct sdhci_ops *ops;
 	u32 flags;
 };

 static void am654_sdhci_set_control_reg(struct sdhci_host *host)
 {
 	struct mmc *mmc = (struct mmc *)host->mmc;
 	u32 reg;

 	if (IS_SD(host->mmc) &&
 	    mmc->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
 		reg = sdhci_readw(host, SDHCI_HOST_CONTROL2);
 		reg |= SDHCI_CTRL_VDD_180;
 		sdhci_writew(host, reg, SDHCI_HOST_CONTROL2);
 	}

 	sdhci_set_uhs_timing(host);
 }

 static int am654_sdhci_set_ios_post(struct sdhci_host *host)
 {
 	struct udevice *dev = host->mmc->dev;
 	struct am654_sdhci_plat *plat = dev_get_plat(dev);
 	unsigned int speed = host->mmc->clock;
 	int sel50, sel100, freqsel;
 	u32 otap_del_sel;
 	u32 mask, val;
 	int ret;

 	/* Reset SD Clock Enable */
 	val = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
 	val &= ~SDHCI_CLOCK_CARD_EN;
 	sdhci_writew(host, val, SDHCI_CLOCK_CONTROL);

 	/* power off phy */
 	if (plat->dll_on) {
 		regmap_update_bits(plat->base, PHY_CTRL1, ENDLL_MASK, 0);

 		plat->dll_on = false;
 	}

 	/* restart clock */
 	sdhci_set_clock(host->mmc, speed);

 	/* switch phy back on */
 	if (speed > AM654_SDHCI_MIN_FREQ) {
 		otap_del_sel = plat->otap_del_sel[host->mmc->selected_mode];
 		mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK;
 		val = (1 << OTAPDLYENA_SHIFT) |
 		      (otap_del_sel << OTAPDLYSEL_SHIFT);

 		/* Write to STRBSEL for HS400 speed mode */
 		if (host->mmc->selected_mode == MMC_HS_400) {
 			if (plat->flags & STRBSEL_4_BIT)
 				mask |= STRBSEL_4BIT_MASK;
 			else
 				mask |= STRBSEL_8BIT_MASK;

 			val |= plat->strb_sel << STRBSEL_SHIFT;
 		}

 		regmap_update_bits(plat->base, PHY_CTRL4, mask, val);

 		if (plat->flags & FREQSEL_2_BIT) {
 			switch (speed) {
 			case 200000000:
 				sel50 = 0;
 				sel100 = 0;
 				break;
 			case 100000000:
 				sel50 = 0;
 				sel100 = 1;
 				break;
 			default:
 				sel50 = 1;
 				sel100 = 0;
 			}

 			/* Configure PHY DLL frequency */
 			mask = SEL50_MASK | SEL100_MASK;
 			val = (sel50 << SEL50_SHIFT) | (sel100 << SEL100_SHIFT);
 			regmap_update_bits(plat->base, PHY_CTRL5, mask, val);
 		} else {
 			switch (speed) {
 			case 200000000:
 				freqsel = 0x0;
 				break;
 			default:
 				freqsel = 0x4;
 			}
 			regmap_update_bits(plat->base, PHY_CTRL5, FREQSEL_MASK,
 					   freqsel << FREQSEL_SHIFT);
 		}

 		/* Enable DLL */
 		regmap_update_bits(plat->base, PHY_CTRL1, ENDLL_MASK,
 				   0x1 << ENDLL_SHIFT);
 		/*
 		 * Poll for DLL ready. Use a one second timeout.
 		 * Works in all experiments done so far
 		 */
 		ret = regmap_read_poll_timeout(plat->base, PHY_STAT1, val,
 					 val & DLLRDY_MASK, 1000, 1000000);
 		if (ret)
 			return ret;

 		plat->dll_on = true;
 	}

 	return 0;
 }

 int am654_sdhci_init(struct am654_sdhci_plat *plat)
 {
 	u32 ctl_cfg_2 = 0;
 	u32 mask, val;
 	int ret;

 	/* Reset OTAP to default value */
 	mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK;
 	regmap_update_bits(plat->base, PHY_CTRL4, mask, 0x0);

 	if (plat->flags & DLL_PRESENT) {
 		regmap_read(plat->base, PHY_STAT1, &val);
 		if (~val & CALDONE_MASK) {
 			/* Calibrate IO lines */
 			regmap_update_bits(plat->base, PHY_CTRL1, PDB_MASK,
 					   PDB_MASK);
 			ret = regmap_read_poll_timeout(plat->base, PHY_STAT1,
 						       val, val & CALDONE_MASK,
 						       1, 20);
 			if (ret)
 				return ret;
 		}

 		/* Configure DLL TRIM */
 		mask = DLL_TRIM_ICP_MASK;
 		val = plat->trm_icp << DLL_TRIM_ICP_SHIFT;

 		/* Configure DLL driver strength */
 		mask |= DR_TY_MASK;
 		val |= plat->drv_strength << DR_TY_SHIFT;
 		regmap_update_bits(plat->base, PHY_CTRL1, mask, val);
 	}

 	/* Enable pins by setting IO mux to 0 */
 	if (plat->flags & IOMUX_PRESENT)
 		regmap_update_bits(plat->base, PHY_CTRL1, IOMUX_ENABLE_MASK, 0);

 	/* Set slot type based on SD or eMMC */
 	if (plat->non_removable)
 		ctl_cfg_2 = SLOTTYPE_EMBEDDED;

 	regmap_update_bits(plat->base, CTL_CFG_2, SLOTTYPE_MASK, ctl_cfg_2);

 	return 0;
 }

 #define MAX_SDCD_DEBOUNCE_TIME 2000
 static int am654_sdhci_deferred_probe(struct sdhci_host *host)
 {
 	struct udevice *dev = host->mmc->dev;
 	struct am654_sdhci_plat *plat = dev_get_plat(dev);
 	unsigned long start;
 	int val;

 	/*
 	 * The controller takes about 1 second to debounce the card detect line
 	 * and doesn't let us power on until that time is up. Instead of waiting
 	 * for 1 second at every stage, poll on the CARD_PRESENT bit upto a
 	 * maximum of 2 seconds to be safe..
 	 */
 	start = get_timer(0);
 	do {
 		if (get_timer(start) > MAX_SDCD_DEBOUNCE_TIME)
 			return -ENOMEDIUM;

 		val = mmc_getcd(host->mmc);
 	} while (!val);

 	am654_sdhci_init(plat);

 	return sdhci_probe(dev);
 }

 const struct sdhci_ops am654_sdhci_ops = {
 	.deferred_probe		= am654_sdhci_deferred_probe,
 	.set_ios_post		= &am654_sdhci_set_ios_post,
 	.set_control_reg	= &am654_sdhci_set_control_reg,
 };

 const struct am654_driver_data am654_drv_data = {
 	.ops = &am654_sdhci_ops,
 	.flags = IOMUX_PRESENT | FREQSEL_2_BIT | DLL_PRESENT | STRBSEL_4_BIT,
 };

 const struct am654_driver_data j721e_8bit_drv_data = {
 	.ops = &am654_sdhci_ops,
 	.flags = DLL_PRESENT,
 };

 static int j721e_4bit_sdhci_set_ios_post(struct sdhci_host *host)
 {
 	struct udevice *dev = host->mmc->dev;
 	struct am654_sdhci_plat *plat = dev_get_plat(dev);
 	u32 otap_del_sel, mask, val;

 	otap_del_sel = plat->otap_del_sel[host->mmc->selected_mode];
 	mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK;
 	val = (1 << OTAPDLYENA_SHIFT) | (otap_del_sel << OTAPDLYSEL_SHIFT);
 	regmap_update_bits(plat->base, PHY_CTRL4, mask, val);

 	return 0;
 }

 const struct sdhci_ops j721e_4bit_sdhci_ops = {
 	.deferred_probe		= am654_sdhci_deferred_probe,
 	.set_ios_post		= &j721e_4bit_sdhci_set_ios_post,
 };

 const struct am654_driver_data j721e_4bit_drv_data = {
 	.ops = &j721e_4bit_sdhci_ops,
 	.flags = IOMUX_PRESENT,
 };

 static int sdhci_am654_get_otap_delay(struct udevice *dev,
 				      struct mmc_config *cfg)
 {
 	struct am654_sdhci_plat *plat = dev_get_plat(dev);
 	int ret;
 	int i;

 	/* ti,otap-del-sel-legacy is mandatory */
 	ret = dev_read_u32(dev, "ti,otap-del-sel-legacy",
 			   &plat->otap_del_sel[0]);
 	if (ret)
 		return ret;
 	/*
 	 * Remove the corresponding capability if an otap-del-sel
 	 * value is not found
 	 */
 	for (i = MMC_HS; i <= MMC_HS_400; i++) {
 		ret = dev_read_u32(dev, td[i].binding, &plat->otap_del_sel[i]);
 		if (ret) {
 			dev_dbg(dev, "Couldn't find %s\n", td[i].binding);
 			/*
 			 * Remove the corresponding capability
 			 * if an otap-del-sel value is not found
 			 */
 			cfg->host_caps &= ~td[i].capability;
 		}
 	}

 	return 0;
 }

 static int am654_sdhci_probe(struct udevice *dev)
 {
 	struct am654_driver_data *drv_data =
 			(struct am654_driver_data *)dev_get_driver_data(dev);
 	struct am654_sdhci_plat *plat = dev_get_plat(dev);
 	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
 	struct sdhci_host *host = dev_get_priv(dev);
 	struct mmc_config *cfg = &plat->cfg;
 	struct clk clk;
 	unsigned long clock;
 	int ret;

 	ret = clk_get_by_name(dev, "clk_xin", &clk);
 	if (ret) {
 		dev_err(dev, "failed to get clock\n");
 		return ret;
 	}

 	clock = clk_get_rate(&clk);
 	if (IS_ERR_VALUE(clock)) {
 		dev_err(dev, "failed to get rate\n");
 		return clock;
 	}

 	host->max_clk = clock;
 	host->mmc = &plat->mmc;
 	host->mmc->dev = dev;
 	ret = sdhci_setup_cfg(cfg, host, cfg->f_max,
 			      AM654_SDHCI_MIN_FREQ);
 	if (ret)
 		return ret;

 	ret = sdhci_am654_get_otap_delay(dev, cfg);
 	if (ret)
 		return ret;

 	host->ops = drv_data->ops;
 	host->mmc->priv = host;
 	upriv->mmc = host->mmc;

 	regmap_init_mem_index(dev_ofnode(dev), &plat->base, 1);

 	return 0;
 }

 static int am654_sdhci_of_to_plat(struct udevice *dev)
 {
 	struct am654_sdhci_plat *plat = dev_get_plat(dev);
 	struct sdhci_host *host = dev_get_priv(dev);
 	struct mmc_config *cfg = &plat->cfg;
 	u32 drv_strength;
 	int ret;

 	host->name = dev->name;
 	host->ioaddr = (void *)dev_read_addr(dev);
 	plat->non_removable = dev_read_bool(dev, "non-removable");

 	if (plat->flags & DLL_PRESENT) {
 		ret = dev_read_u32(dev, "ti,trm-icp", &plat->trm_icp);
 		if (ret)
 			return ret;

 		ret = dev_read_u32(dev, "ti,driver-strength-ohm",
 				   &drv_strength);
 		if (ret)
 			return ret;

 		switch (drv_strength) {
 		case 50:
 			plat->drv_strength = DRIVER_STRENGTH_50_OHM;
 			break;
 		case 33:
 			plat->drv_strength = DRIVER_STRENGTH_33_OHM;
 			break;
 		case 66:
 			plat->drv_strength = DRIVER_STRENGTH_66_OHM;
 			break;
 		case 100:
 			plat->drv_strength = DRIVER_STRENGTH_100_OHM;
 			break;
 		case 40:
 			plat->drv_strength = DRIVER_STRENGTH_40_OHM;
 			break;
 		default:
 			dev_err(dev, "Invalid driver strength\n");
 			return -EINVAL;
 		}
 	}

 	ret = mmc_of_parse(dev, cfg);
 	if (ret)
 		return ret;

 	return 0;
 }

 static int am654_sdhci_bind(struct udevice *dev)
 {
 	struct am654_driver_data *drv_data =
 			(struct am654_driver_data *)dev_get_driver_data(dev);
 	struct am654_sdhci_plat *plat = dev_get_plat(dev);

 	plat->flags = drv_data->flags;

 	return sdhci_bind(dev, &plat->mmc, &plat->cfg);
 }

 static const struct udevice_id am654_sdhci_ids[] = {
 	{
 		.compatible = "ti,am654-sdhci-5.1",
 		.data = (ulong)&am654_drv_data,
 	},
 	{
 		.compatible = "ti,j721e-sdhci-8bit",
 		.data = (ulong)&j721e_8bit_drv_data,
 	},
 	{
 		.compatible = "ti,j721e-sdhci-4bit",
 		.data = (ulong)&j721e_4bit_drv_data,
 	},
 	{ }
 };

 U_BOOT_DRIVER(am654_sdhci_drv) = {
 	.name		= "am654_sdhci",
 	.id		= UCLASS_MMC,
 	.of_match	= am654_sdhci_ids,
 	.of_to_plat = am654_sdhci_of_to_plat,
 	.ops		= &sdhci_ops,
 	.bind		= am654_sdhci_bind,
 	.probe		= am654_sdhci_probe,
 	.priv_auto	= sizeof(struct sdhci_host),
 	.plat_auto	= sizeof(struct am654_sdhci_plat),
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
	*
	* Texas Instruments' K3 SD Host Controller Interface
	*/

	#include <clk.h>
	#include <common.h>
	#include <dm.h>
	#include <malloc.h>
	#include <power-domain.h>
	#include <regmap.h>
	#include <sdhci.h>
	#include <dm/device_compat.h>
	#include <linux/bitops.h>
	#include <linux/err.h>

	/* CTL_CFG Registers */
	#define CTL_CFG_2 0x14

	#define SLOTTYPE_MASK GENMASK(31, 30)
	#define SLOTTYPE_EMBEDDED BIT(30)

	/* PHY Registers */
	#define PHY_CTRL1 0x100
	#define PHY_CTRL2 0x104
	#define PHY_CTRL3 0x108
	#define PHY_CTRL4 0x10C
	#define PHY_CTRL5 0x110
	#define PHY_CTRL6 0x114
	#define PHY_STAT1 0x130
	#define PHY_STAT2 0x134

	#define IOMUX_ENABLE_SHIFT 31
	#define IOMUX_ENABLE_MASK BIT(IOMUX_ENABLE_SHIFT)
	#define OTAPDLYENA_SHIFT 20
	#define OTAPDLYENA_MASK BIT(OTAPDLYENA_SHIFT)
	#define OTAPDLYSEL_SHIFT 12
	#define OTAPDLYSEL_MASK GENMASK(15, 12)
	#define STRBSEL_SHIFT 24
	#define STRBSEL_4BIT_MASK GENMASK(27, 24)
	#define STRBSEL_8BIT_MASK GENMASK(31, 24)
	#define SEL50_SHIFT 8
	#define SEL50_MASK BIT(SEL50_SHIFT)
	#define SEL100_SHIFT 9
	#define SEL100_MASK BIT(SEL100_SHIFT)
	#define FREQSEL_SHIFT 8
	#define FREQSEL_MASK GENMASK(10, 8)
	#define DLL_TRIM_ICP_SHIFT 4
	#define DLL_TRIM_ICP_MASK GENMASK(7, 4)
	#define DR_TY_SHIFT 20
	#define DR_TY_MASK GENMASK(22, 20)
	#define ENDLL_SHIFT 1
	#define ENDLL_MASK BIT(ENDLL_SHIFT)
	#define DLLRDY_SHIFT 0
	#define DLLRDY_MASK BIT(DLLRDY_SHIFT)
	#define PDB_SHIFT 0
	#define PDB_MASK BIT(PDB_SHIFT)
	#define CALDONE_SHIFT 1
	#define CALDONE_MASK BIT(CALDONE_SHIFT)
	#define RETRIM_SHIFT 17
	#define RETRIM_MASK BIT(RETRIM_SHIFT)

	#define DRIVER_STRENGTH_50_OHM 0x0
	#define DRIVER_STRENGTH_33_OHM 0x1
	#define DRIVER_STRENGTH_66_OHM 0x2
	#define DRIVER_STRENGTH_100_OHM 0x3
	#define DRIVER_STRENGTH_40_OHM 0x4

	#define AM654_SDHCI_MIN_FREQ 400000

	struct am654_sdhci_plat {
	struct mmc_config cfg;
	struct mmc mmc;
	struct regmap *base;
	bool non_removable;
	u32 otap_del_sel[MMC_MODES_END];
	u32 trm_icp;
	u32 drv_strength;
	u32 strb_sel;
	u32 flags;
	#define DLL_PRESENT (1 << 0)
	#define IOMUX_PRESENT (1 << 1)
	#define FREQSEL_2_BIT (1 << 2)
	#define STRBSEL_4_BIT (1 << 3)
	bool dll_on;
	};

	struct timing_data {
	const char *binding;
	u32 capability;
	};

	static const struct timing_data td[] = {
	[MMC_LEGACY] = {"ti,otap-del-sel-legacy", 0},
	[MMC_HS] = {"ti,otap-del-sel-mmc-hs", MMC_CAP(MMC_HS)},
	[SD_HS] = {"ti,otap-del-sel-sd-hs", MMC_CAP(SD_HS)},
	[UHS_SDR12] = {"ti,otap-del-sel-sdr12", MMC_CAP(UHS_SDR12)},
	[UHS_SDR25] = {"ti,otap-del-sel-sdr25", MMC_CAP(UHS_SDR25)},
	[UHS_SDR50] = {"ti,otap-del-sel-sdr50", MMC_CAP(UHS_SDR50)},
	[UHS_SDR104] = {"ti,otap-del-sel-sdr104", MMC_CAP(UHS_SDR104)},
	[UHS_DDR50] = {"ti,otap-del-sel-ddr50", MMC_CAP(UHS_DDR50)},
	[MMC_DDR_52] = {"ti,otap-del-sel-ddr52", MMC_CAP(MMC_DDR_52)},
	[MMC_HS_200] = {"ti,otap-del-sel-hs200", MMC_CAP(MMC_HS_200)},
	[MMC_HS_400] = {"ti,otap-del-sel-hs400", MMC_CAP(MMC_HS_400)},
	};

	struct am654_driver_data {
	const struct sdhci_ops *ops;
	u32 flags;
	};

	static void am654_sdhci_set_control_reg(struct sdhci_host *host)
	{
	struct mmc mmc = (struct mmc )host->mmc;
	u32 reg;

	if (IS_SD(host->mmc) &&
	mmc->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
	reg = sdhci_readw(host, SDHCI_HOST_CONTROL2);
	reg \|= SDHCI_CTRL_VDD_180;
	sdhci_writew(host, reg, SDHCI_HOST_CONTROL2);
	}

	sdhci_set_uhs_timing(host);
	}

	static int am654_sdhci_set_ios_post(struct sdhci_host *host)
	{
	struct udevice *dev = host->mmc->dev;
	struct am654_sdhci_plat *plat = dev_get_plat(dev);
	unsigned int speed = host->mmc->clock;
	int sel50, sel100, freqsel;
	u32 otap_del_sel;
	u32 mask, val;
	int ret;

	/* Reset SD Clock Enable */
	val = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
	val &= ~SDHCI_CLOCK_CARD_EN;
	sdhci_writew(host, val, SDHCI_CLOCK_CONTROL);

	/* power off phy */
	if (plat->dll_on) {
	regmap_update_bits(plat->base, PHY_CTRL1, ENDLL_MASK, 0);

	plat->dll_on = false;
	}

	/* restart clock */
	sdhci_set_clock(host->mmc, speed);

	/* switch phy back on */
	if (speed > AM654_SDHCI_MIN_FREQ) {
	otap_del_sel = plat->otap_del_sel[host->mmc->selected_mode];
	mask = OTAPDLYENA_MASK \| OTAPDLYSEL_MASK;
	val = (1 << OTAPDLYENA_SHIFT) \|
	(otap_del_sel << OTAPDLYSEL_SHIFT);

	/* Write to STRBSEL for HS400 speed mode */
	if (host->mmc->selected_mode == MMC_HS_400) {
	if (plat->flags & STRBSEL_4_BIT)
	mask \|= STRBSEL_4BIT_MASK;
	else
	mask \|= STRBSEL_8BIT_MASK;

	val \|= plat->strb_sel << STRBSEL_SHIFT;
	}

	regmap_update_bits(plat->base, PHY_CTRL4, mask, val);

	if (plat->flags & FREQSEL_2_BIT) {
	switch (speed) {
	case 200000000:
	sel50 = 0;
	sel100 = 0;
	break;
	case 100000000:
	sel50 = 0;
	sel100 = 1;
	break;
	default:
	sel50 = 1;
	sel100 = 0;
	}

	/* Configure PHY DLL frequency */
	mask = SEL50_MASK \| SEL100_MASK;
	val = (sel50 << SEL50_SHIFT) \| (sel100 << SEL100_SHIFT);
	regmap_update_bits(plat->base, PHY_CTRL5, mask, val);
	} else {
	switch (speed) {
	case 200000000:
	freqsel = 0x0;
	break;
	default:
	freqsel = 0x4;
	}
	regmap_update_bits(plat->base, PHY_CTRL5, FREQSEL_MASK,
	freqsel << FREQSEL_SHIFT);
	}

	/* Enable DLL */
	regmap_update_bits(plat->base, PHY_CTRL1, ENDLL_MASK,
	0x1 << ENDLL_SHIFT);
	/*
	* Poll for DLL ready. Use a one second timeout.
	* Works in all experiments done so far
	*/
	ret = regmap_read_poll_timeout(plat->base, PHY_STAT1, val,
	val & DLLRDY_MASK, 1000, 1000000);
	if (ret)
	return ret;

	plat->dll_on = true;
	}

	return 0;
	}

	int am654_sdhci_init(struct am654_sdhci_plat *plat)
	{
	u32 ctl_cfg_2 = 0;
	u32 mask, val;
	int ret;

	/* Reset OTAP to default value */
	mask = OTAPDLYENA_MASK \| OTAPDLYSEL_MASK;
	regmap_update_bits(plat->base, PHY_CTRL4, mask, 0x0);

	if (plat->flags & DLL_PRESENT) {
	regmap_read(plat->base, PHY_STAT1, &val);
	if (~val & CALDONE_MASK) {
	/* Calibrate IO lines */
	regmap_update_bits(plat->base, PHY_CTRL1, PDB_MASK,
	PDB_MASK);
	ret = regmap_read_poll_timeout(plat->base, PHY_STAT1,
	val, val & CALDONE_MASK,
	1, 20);
	if (ret)
	return ret;
	}

	/* Configure DLL TRIM */
	mask = DLL_TRIM_ICP_MASK;
	val = plat->trm_icp << DLL_TRIM_ICP_SHIFT;

	/* Configure DLL driver strength */
	mask \|= DR_TY_MASK;
	val \|= plat->drv_strength << DR_TY_SHIFT;
	regmap_update_bits(plat->base, PHY_CTRL1, mask, val);
	}

	/* Enable pins by setting IO mux to 0 */
	if (plat->flags & IOMUX_PRESENT)
	regmap_update_bits(plat->base, PHY_CTRL1, IOMUX_ENABLE_MASK, 0);

	/* Set slot type based on SD or eMMC */
	if (plat->non_removable)
	ctl_cfg_2 = SLOTTYPE_EMBEDDED;

	regmap_update_bits(plat->base, CTL_CFG_2, SLOTTYPE_MASK, ctl_cfg_2);

	return 0;
	}

	#define MAX_SDCD_DEBOUNCE_TIME 2000
	static int am654_sdhci_deferred_probe(struct sdhci_host *host)
	{
	struct udevice *dev = host->mmc->dev;
	struct am654_sdhci_plat *plat = dev_get_plat(dev);
	unsigned long start;
	int val;

	/*
	* The controller takes about 1 second to debounce the card detect line
	* and doesn't let us power on until that time is up. Instead of waiting
	* for 1 second at every stage, poll on the CARD_PRESENT bit upto a
	* maximum of 2 seconds to be safe..
	*/
	start = get_timer(0);
	do {
	if (get_timer(start) > MAX_SDCD_DEBOUNCE_TIME)
	return -ENOMEDIUM;

	val = mmc_getcd(host->mmc);
	} while (!val);

	am654_sdhci_init(plat);

	return sdhci_probe(dev);
	}

	const struct sdhci_ops am654_sdhci_ops = {
	.deferred_probe = am654_sdhci_deferred_probe,
	.set_ios_post = &am654_sdhci_set_ios_post,
	.set_control_reg = &am654_sdhci_set_control_reg,
	};

	const struct am654_driver_data am654_drv_data = {
	.ops = &am654_sdhci_ops,
	.flags = IOMUX_PRESENT \| FREQSEL_2_BIT \| DLL_PRESENT \| STRBSEL_4_BIT,
	};

	const struct am654_driver_data j721e_8bit_drv_data = {
	.ops = &am654_sdhci_ops,
	.flags = DLL_PRESENT,
	};

	static int j721e_4bit_sdhci_set_ios_post(struct sdhci_host *host)
	{
	struct udevice *dev = host->mmc->dev;
	struct am654_sdhci_plat *plat = dev_get_plat(dev);
	u32 otap_del_sel, mask, val;

	otap_del_sel = plat->otap_del_sel[host->mmc->selected_mode];
	mask = OTAPDLYENA_MASK \| OTAPDLYSEL_MASK;
	val = (1 << OTAPDLYENA_SHIFT) \| (otap_del_sel << OTAPDLYSEL_SHIFT);
	regmap_update_bits(plat->base, PHY_CTRL4, mask, val);

	return 0;
	}

	const struct sdhci_ops j721e_4bit_sdhci_ops = {
	.deferred_probe = am654_sdhci_deferred_probe,
	.set_ios_post = &j721e_4bit_sdhci_set_ios_post,
	};

	const struct am654_driver_data j721e_4bit_drv_data = {
	.ops = &j721e_4bit_sdhci_ops,
	.flags = IOMUX_PRESENT,
	};

	static int sdhci_am654_get_otap_delay(struct udevice *dev,
	struct mmc_config *cfg)
	{
	struct am654_sdhci_plat *plat = dev_get_plat(dev);
	int ret;
	int i;

	/* ti,otap-del-sel-legacy is mandatory */
	ret = dev_read_u32(dev, "ti,otap-del-sel-legacy",
	&plat->otap_del_sel[0]);
	if (ret)
	return ret;
	/*
	* Remove the corresponding capability if an otap-del-sel
	* value is not found
	*/
	for (i = MMC_HS; i <= MMC_HS_400; i++) {
	ret = dev_read_u32(dev, td[i].binding, &plat->otap_del_sel[i]);
	if (ret) {
	dev_dbg(dev, "Couldn't find %s\n", td[i].binding);
	/*
	* Remove the corresponding capability
	* if an otap-del-sel value is not found
	*/
	cfg->host_caps &= ~td[i].capability;
	}
	}

	return 0;
	}

	static int am654_sdhci_probe(struct udevice *dev)
	{
	struct am654_driver_data *drv_data =
	(struct am654_driver_data *)dev_get_driver_data(dev);
	struct am654_sdhci_plat *plat = dev_get_plat(dev);
	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
	struct sdhci_host *host = dev_get_priv(dev);
	struct mmc_config *cfg = &plat->cfg;
	struct clk clk;
	unsigned long clock;
	int ret;

	ret = clk_get_by_name(dev, "clk_xin", &clk);
	if (ret) {
	dev_err(dev, "failed to get clock\n");
	return ret;
	}

	clock = clk_get_rate(&clk);
	if (IS_ERR_VALUE(clock)) {
	dev_err(dev, "failed to get rate\n");
	return clock;
	}

	host->max_clk = clock;
	host->mmc = &plat->mmc;
	host->mmc->dev = dev;
	ret = sdhci_setup_cfg(cfg, host, cfg->f_max,
	AM654_SDHCI_MIN_FREQ);
	if (ret)
	return ret;

	ret = sdhci_am654_get_otap_delay(dev, cfg);
	if (ret)
	return ret;

	host->ops = drv_data->ops;
	host->mmc->priv = host;
	upriv->mmc = host->mmc;

	regmap_init_mem_index(dev_ofnode(dev), &plat->base, 1);

	return 0;
	}

	static int am654_sdhci_of_to_plat(struct udevice *dev)
	{
	struct am654_sdhci_plat *plat = dev_get_plat(dev);
	struct sdhci_host *host = dev_get_priv(dev);
	struct mmc_config *cfg = &plat->cfg;
	u32 drv_strength;
	int ret;

	host->name = dev->name;
	host->ioaddr = (void *)dev_read_addr(dev);
	plat->non_removable = dev_read_bool(dev, "non-removable");

	if (plat->flags & DLL_PRESENT) {
	ret = dev_read_u32(dev, "ti,trm-icp", &plat->trm_icp);
	if (ret)
	return ret;

	ret = dev_read_u32(dev, "ti,driver-strength-ohm",
	&drv_strength);
	if (ret)
	return ret;

	switch (drv_strength) {
	case 50:
	plat->drv_strength = DRIVER_STRENGTH_50_OHM;
	break;
	case 33:
	plat->drv_strength = DRIVER_STRENGTH_33_OHM;
	break;
	case 66:
	plat->drv_strength = DRIVER_STRENGTH_66_OHM;
	break;
	case 100:
	plat->drv_strength = DRIVER_STRENGTH_100_OHM;
	break;
	case 40:
	plat->drv_strength = DRIVER_STRENGTH_40_OHM;
	break;
	default:
	dev_err(dev, "Invalid driver strength\n");
	return -EINVAL;
	}
	}

	ret = mmc_of_parse(dev, cfg);
	if (ret)
	return ret;

	return 0;
	}

	static int am654_sdhci_bind(struct udevice *dev)
	{
	struct am654_driver_data *drv_data =
	(struct am654_driver_data *)dev_get_driver_data(dev);
	struct am654_sdhci_plat *plat = dev_get_plat(dev);

	plat->flags = drv_data->flags;

	return sdhci_bind(dev, &plat->mmc, &plat->cfg);
	}

	static const struct udevice_id am654_sdhci_ids[] = {
	{
	.compatible = "ti,am654-sdhci-5.1",
	.data = (ulong)&am654_drv_data,
	},
	{
	.compatible = "ti,j721e-sdhci-8bit",
	.data = (ulong)&j721e_8bit_drv_data,
	},
	{
	.compatible = "ti,j721e-sdhci-4bit",
	.data = (ulong)&j721e_4bit_drv_data,
	},
	{ }
	};

	U_BOOT_DRIVER(am654_sdhci_drv) = {
	.name = "am654_sdhci",
	.id = UCLASS_MMC,
	.of_match = am654_sdhci_ids,
	.of_to_plat = am654_sdhci_of_to_plat,
	.ops = &sdhci_ops,
	.bind = am654_sdhci_bind,
	.probe = am654_sdhci_probe,
	.priv_auto = sizeof(struct sdhci_host),
	.plat_auto = sizeof(struct am654_sdhci_plat),
	};