drivers/mmc/host/sdhci_am654.c - third_party/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * sdhci_am654.c - SDHCI driver for TI's AM654 SOCs
  *
  * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com
  *
  */
 #include <linux/clk.h>
 #include <linux/of.h>
 #include <linux/module.h>
 #include <linux/pm_runtime.h>
 #include <linux/property.h>
 #include <linux/regmap.h>

 #include "sdhci-pltfm.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 CLOCK_TOO_SLOW_HZ	400000

 static struct regmap_config sdhci_am654_regmap_config = {
 	.reg_bits = 32,
 	.val_bits = 32,
 	.reg_stride = 4,
 	.fast_io = true,
 };

 struct sdhci_am654_data {
 	struct regmap *base;
 	int otap_del_sel;
 	int trm_icp;
 	int drv_strength;
 	bool dll_on;
 	int strb_sel;
 	u32 flags;
 };

 struct sdhci_am654_driver_data {
 	const struct sdhci_pltfm_data *pdata;
 	u32 flags;
 #define IOMUX_PRESENT	(1 << 0)
 #define FREQSEL_2_BIT	(1 << 1)
 #define STRBSEL_4_BIT	(1 << 2)
 #define DLL_PRESENT	(1 << 3)
 };

 static void sdhci_am654_set_clock(struct sdhci_host *host, unsigned int clock)
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
 	int sel50, sel100, freqsel;
 	u32 mask, val;
 	int ret;

 	if (sdhci_am654->dll_on) {
 		regmap_update_bits(sdhci_am654->base, PHY_CTRL1, ENDLL_MASK, 0);

 		sdhci_am654->dll_on = false;
 	}

 	sdhci_set_clock(host, clock);

 	if (clock > CLOCK_TOO_SLOW_HZ) {
 		/* Setup DLL Output TAP delay */
 		mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK;
 		val = (1 << OTAPDLYENA_SHIFT) |
 		      (sdhci_am654->otap_del_sel << OTAPDLYSEL_SHIFT);
 		regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask, val);
 		/* Write to STRBSEL for HS400 speed mode */
 		if (host->mmc->ios.timing == MMC_TIMING_MMC_HS400) {
 			if (sdhci_am654->flags & STRBSEL_4_BIT)
 				mask = STRBSEL_4BIT_MASK;
 			else
 				mask = STRBSEL_8BIT_MASK;

 			regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask,
 					   sdhci_am654->strb_sel <<
 					   STRBSEL_SHIFT);
 		}

 		if (sdhci_am654->flags & FREQSEL_2_BIT) {
 			switch (clock) {
 			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(sdhci_am654->base, PHY_CTRL5, mask,
 					   val);
 		} else {
 			switch (clock) {
 			case 200000000:
 				freqsel = 0x0;
 				break;
 			default:
 				freqsel = 0x4;
 			}

 			regmap_update_bits(sdhci_am654->base, PHY_CTRL5,
 					   FREQSEL_MASK,
 					   freqsel << FREQSEL_SHIFT);
 		}

 		/* Configure DLL TRIM */
 		mask = DLL_TRIM_ICP_MASK;
 		val = sdhci_am654->trm_icp << DLL_TRIM_ICP_SHIFT;

 		/* Configure DLL driver strength */
 		mask |= DR_TY_MASK;
 		val |= sdhci_am654->drv_strength << DR_TY_SHIFT;
 		regmap_update_bits(sdhci_am654->base, PHY_CTRL1, mask, val);
 		/* Enable DLL */
 		regmap_update_bits(sdhci_am654->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(sdhci_am654->base, PHY_STAT1,
 					       val, val & DLLRDY_MASK, 1000,
 					       1000000);
 		if (ret) {
 			dev_err(mmc_dev(host->mmc), "DLL failed to relock\n");
 			return;
 		}

 		sdhci_am654->dll_on = true;
 	}
 }

 static void sdhci_j721e_4bit_set_clock(struct sdhci_host *host,
 				       unsigned int clock)
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
 	int val, mask;

 	mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK;
 	val = (1 << OTAPDLYENA_SHIFT) |
 	      (sdhci_am654->otap_del_sel << OTAPDLYSEL_SHIFT);
 	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask, val);

 	sdhci_set_clock(host, clock);
 }

 static void sdhci_am654_set_power(struct sdhci_host *host, unsigned char mode,
 				  unsigned short vdd)
 {
 	if (!IS_ERR(host->mmc->supply.vmmc)) {
 		struct mmc_host *mmc = host->mmc;

 		mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
 	}
 	sdhci_set_power_noreg(host, mode, vdd);
 }

 static void sdhci_am654_write_b(struct sdhci_host *host, u8 val, int reg)
 {
 	unsigned char timing = host->mmc->ios.timing;

 	if (reg == SDHCI_HOST_CONTROL) {
 		switch (timing) {
 		/*
 		 * According to the data manual, HISPD bit
 		 * should not be set in these speed modes.
 		 */
 		case MMC_TIMING_SD_HS:
 		case MMC_TIMING_MMC_HS:
 		case MMC_TIMING_UHS_SDR12:
 		case MMC_TIMING_UHS_SDR25:
 			val &= ~SDHCI_CTRL_HISPD;
 		}
 	}

 	writeb(val, host->ioaddr + reg);
 }

 static int sdhci_am654_execute_tuning(struct mmc_host *mmc, u32 opcode)
 {
 	struct sdhci_host *host = mmc_priv(mmc);
 	int err = sdhci_execute_tuning(mmc, opcode);

 	if (err)
 		return err;
 	/*
 	 * Tuning data remains in the buffer after tuning.
 	 * Do a command and data reset to get rid of it
 	 */
 	sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);

 	return 0;
 }

 static struct sdhci_ops sdhci_am654_ops = {
 	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
 	.get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
 	.set_uhs_signaling = sdhci_set_uhs_signaling,
 	.set_bus_width = sdhci_set_bus_width,
 	.set_power = sdhci_am654_set_power,
 	.set_clock = sdhci_am654_set_clock,
 	.write_b = sdhci_am654_write_b,
 	.reset = sdhci_reset,
 };

 static const struct sdhci_pltfm_data sdhci_am654_pdata = {
 	.ops = &sdhci_am654_ops,
 	.quirks = SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12,
 	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
 };

 static const struct sdhci_am654_driver_data sdhci_am654_drvdata = {
 	.pdata = &sdhci_am654_pdata,
 	.flags = IOMUX_PRESENT | FREQSEL_2_BIT | STRBSEL_4_BIT | DLL_PRESENT,
 };

 static struct sdhci_ops sdhci_j721e_8bit_ops = {
 	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
 	.get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
 	.set_uhs_signaling = sdhci_set_uhs_signaling,
 	.set_bus_width = sdhci_set_bus_width,
 	.set_power = sdhci_am654_set_power,
 	.set_clock = sdhci_am654_set_clock,
 	.write_b = sdhci_am654_write_b,
 	.reset = sdhci_reset,
 };

 static const struct sdhci_pltfm_data sdhci_j721e_8bit_pdata = {
 	.ops = &sdhci_j721e_8bit_ops,
 	.quirks = SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12,
 	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
 };

 static const struct sdhci_am654_driver_data sdhci_j721e_8bit_drvdata = {
 	.pdata = &sdhci_j721e_8bit_pdata,
 	.flags = DLL_PRESENT,
 };

 static struct sdhci_ops sdhci_j721e_4bit_ops = {
 	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
 	.get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
 	.set_uhs_signaling = sdhci_set_uhs_signaling,
 	.set_bus_width = sdhci_set_bus_width,
 	.set_power = sdhci_am654_set_power,
 	.set_clock = sdhci_j721e_4bit_set_clock,
 	.write_b = sdhci_am654_write_b,
 	.reset = sdhci_reset,
 };

 static const struct sdhci_pltfm_data sdhci_j721e_4bit_pdata = {
 	.ops = &sdhci_j721e_4bit_ops,
 	.quirks = SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12,
 	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
 };

 static const struct sdhci_am654_driver_data sdhci_j721e_4bit_drvdata = {
 	.pdata = &sdhci_j721e_4bit_pdata,
 	.flags = IOMUX_PRESENT,
 };
 static int sdhci_am654_init(struct sdhci_host *host)
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
 	u32 ctl_cfg_2 = 0;
 	u32 mask;
 	u32 val;
 	int ret;

 	/* Reset OTAP to default value */
 	mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK;
 	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask, 0x0);

 	if (sdhci_am654->flags & DLL_PRESENT) {
 		regmap_read(sdhci_am654->base, PHY_STAT1, &val);
 		if (~val & CALDONE_MASK) {
 			/* Calibrate IO lines */
 			regmap_update_bits(sdhci_am654->base, PHY_CTRL1,
 					   PDB_MASK, PDB_MASK);
 			ret = regmap_read_poll_timeout(sdhci_am654->base,
 						       PHY_STAT1, val,
 						       val & CALDONE_MASK,
 						       1, 20);
 			if (ret)
 				return ret;
 		}
 	}

 	/* Enable pins by setting IO mux to 0 */
 	if (sdhci_am654->flags & IOMUX_PRESENT)
 		regmap_update_bits(sdhci_am654->base, PHY_CTRL1,
 				   IOMUX_ENABLE_MASK, 0);

 	/* Set slot type based on SD or eMMC */
 	if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
 		ctl_cfg_2 = SLOTTYPE_EMBEDDED;

 	regmap_update_bits(sdhci_am654->base, CTL_CFG_2, SLOTTYPE_MASK,
 			   ctl_cfg_2);

 	return sdhci_add_host(host);
 }

 static int sdhci_am654_get_of_property(struct platform_device *pdev,
 					struct sdhci_am654_data *sdhci_am654)
 {
 	struct device *dev = &pdev->dev;
 	int drv_strength;
 	int ret;

 	ret = device_property_read_u32(dev, "ti,otap-del-sel",
 				       &sdhci_am654->otap_del_sel);
 	if (ret)
 		return ret;

 	if (sdhci_am654->flags & DLL_PRESENT) {
 		ret = device_property_read_u32(dev, "ti,trm-icp",
 					       &sdhci_am654->trm_icp);
 		if (ret)
 			return ret;

 		ret = device_property_read_u32(dev, "ti,driver-strength-ohm",
 					       &drv_strength);
 		if (ret)
 			return ret;

 		switch (drv_strength) {
 		case 50:
 			sdhci_am654->drv_strength = DRIVER_STRENGTH_50_OHM;
 			break;
 		case 33:
 			sdhci_am654->drv_strength = DRIVER_STRENGTH_33_OHM;
 			break;
 		case 66:
 			sdhci_am654->drv_strength = DRIVER_STRENGTH_66_OHM;
 			break;
 		case 100:
 			sdhci_am654->drv_strength = DRIVER_STRENGTH_100_OHM;
 			break;
 		case 40:
 			sdhci_am654->drv_strength = DRIVER_STRENGTH_40_OHM;
 			break;
 		default:
 			dev_err(dev, "Invalid driver strength\n");
 			return -EINVAL;
 		}
 	}

 	device_property_read_u32(dev, "ti,strobe-sel", &sdhci_am654->strb_sel);

 	sdhci_get_of_property(pdev);

 	return 0;
 }

 static const struct of_device_id sdhci_am654_of_match[] = {
 	{
 		.compatible = "ti,am654-sdhci-5.1",
 		.data = &sdhci_am654_drvdata,
 	},
 	{
 		.compatible = "ti,j721e-sdhci-8bit",
 		.data = &sdhci_j721e_8bit_drvdata,
 	},
 	{
 		.compatible = "ti,j721e-sdhci-4bit",
 		.data = &sdhci_j721e_4bit_drvdata,
 	},
 	{ /* sentinel */ }
 };

 static int sdhci_am654_probe(struct platform_device *pdev)
 {
 	const struct sdhci_am654_driver_data *drvdata;
 	struct sdhci_pltfm_host *pltfm_host;
 	struct sdhci_am654_data *sdhci_am654;
 	const struct of_device_id *match;
 	struct sdhci_host *host;
 	struct resource *res;
 	struct clk *clk_xin;
 	struct device *dev = &pdev->dev;
 	void __iomem *base;
 	int ret;

 	match = of_match_node(sdhci_am654_of_match, pdev->dev.of_node);
 	drvdata = match->data;
 	host = sdhci_pltfm_init(pdev, drvdata->pdata, sizeof(*sdhci_am654));
 	if (IS_ERR(host))
 		return PTR_ERR(host);

 	pltfm_host = sdhci_priv(host);
 	sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
 	sdhci_am654->flags = drvdata->flags;

 	clk_xin = devm_clk_get(dev, "clk_xin");
 	if (IS_ERR(clk_xin)) {
 		dev_err(dev, "clk_xin clock not found.\n");
 		ret = PTR_ERR(clk_xin);
 		goto err_pltfm_free;
 	}

 	pltfm_host->clk = clk_xin;

 	/* Clocks are enabled using pm_runtime */
 	pm_runtime_enable(dev);
 	ret = pm_runtime_get_sync(dev);
 	if (ret < 0) {
 		pm_runtime_put_noidle(dev);
 		goto pm_runtime_disable;
 	}

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 	base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(base)) {
 		ret = PTR_ERR(base);
 		goto pm_runtime_put;
 	}

 	sdhci_am654->base = devm_regmap_init_mmio(dev, base,
 						  &sdhci_am654_regmap_config);
 	if (IS_ERR(sdhci_am654->base)) {
 		dev_err(dev, "Failed to initialize regmap\n");
 		ret = PTR_ERR(sdhci_am654->base);
 		goto pm_runtime_put;
 	}

 	ret = sdhci_am654_get_of_property(pdev, sdhci_am654);
 	if (ret)
 		goto pm_runtime_put;

 	ret = mmc_of_parse(host->mmc);
 	if (ret) {
 		dev_err(dev, "parsing dt failed (%d)\n", ret);
 		goto pm_runtime_put;
 	}

 	host->mmc_host_ops.execute_tuning = sdhci_am654_execute_tuning;

 	ret = sdhci_am654_init(host);
 	if (ret)
 		goto pm_runtime_put;

 	return 0;

 pm_runtime_put:
 	pm_runtime_put_sync(dev);
 pm_runtime_disable:
 	pm_runtime_disable(dev);
 err_pltfm_free:
 	sdhci_pltfm_free(pdev);
 	return ret;
 }

 static int sdhci_am654_remove(struct platform_device *pdev)
 {
 	struct sdhci_host *host = platform_get_drvdata(pdev);
 	int ret;

 	sdhci_remove_host(host, true);
 	ret = pm_runtime_put_sync(&pdev->dev);
 	if (ret < 0)
 		return ret;

 	pm_runtime_disable(&pdev->dev);
 	sdhci_pltfm_free(pdev);

 	return 0;
 }

 static struct platform_driver sdhci_am654_driver = {
 	.driver = {
 		.name = "sdhci-am654",
 		.of_match_table = sdhci_am654_of_match,
 	},
 	.probe = sdhci_am654_probe,
 	.remove = sdhci_am654_remove,
 };

 module_platform_driver(sdhci_am654_driver);

 MODULE_DESCRIPTION("Driver for SDHCI Controller on TI's AM654 devices");
 MODULE_AUTHOR("Faiz Abbas <faiz_abbas@ti.com>");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* sdhci_am654.c - SDHCI driver for TI's AM654 SOCs
	*
	* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com
	*
	*/
	#include <linux/clk.h>
	#include <linux/of.h>
	#include <linux/module.h>
	#include <linux/pm_runtime.h>
	#include <linux/property.h>
	#include <linux/regmap.h>

	#include "sdhci-pltfm.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 CLOCK_TOO_SLOW_HZ 400000

	static struct regmap_config sdhci_am654_regmap_config = {
	.reg_bits = 32,
	.val_bits = 32,
	.reg_stride = 4,
	.fast_io = true,
	};

	struct sdhci_am654_data {
	struct regmap *base;
	int otap_del_sel;
	int trm_icp;
	int drv_strength;
	bool dll_on;
	int strb_sel;
	u32 flags;
	};

	struct sdhci_am654_driver_data {
	const struct sdhci_pltfm_data *pdata;
	u32 flags;
	#define IOMUX_PRESENT (1 << 0)
	#define FREQSEL_2_BIT (1 << 1)
	#define STRBSEL_4_BIT (1 << 2)
	#define DLL_PRESENT (1 << 3)
	};

	static void sdhci_am654_set_clock(struct sdhci_host *host, unsigned int clock)
	{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
	int sel50, sel100, freqsel;
	u32 mask, val;
	int ret;

	if (sdhci_am654->dll_on) {
	regmap_update_bits(sdhci_am654->base, PHY_CTRL1, ENDLL_MASK, 0);

	sdhci_am654->dll_on = false;
	}

	sdhci_set_clock(host, clock);

	if (clock > CLOCK_TOO_SLOW_HZ) {
	/* Setup DLL Output TAP delay */
	mask = OTAPDLYENA_MASK \| OTAPDLYSEL_MASK;
	val = (1 << OTAPDLYENA_SHIFT) \|
	(sdhci_am654->otap_del_sel << OTAPDLYSEL_SHIFT);
	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask, val);
	/* Write to STRBSEL for HS400 speed mode */
	if (host->mmc->ios.timing == MMC_TIMING_MMC_HS400) {
	if (sdhci_am654->flags & STRBSEL_4_BIT)
	mask = STRBSEL_4BIT_MASK;
	else
	mask = STRBSEL_8BIT_MASK;

	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask,
	sdhci_am654->strb_sel <<
	STRBSEL_SHIFT);
	}

	if (sdhci_am654->flags & FREQSEL_2_BIT) {
	switch (clock) {
	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(sdhci_am654->base, PHY_CTRL5, mask,
	val);
	} else {
	switch (clock) {
	case 200000000:
	freqsel = 0x0;
	break;
	default:
	freqsel = 0x4;
	}

	regmap_update_bits(sdhci_am654->base, PHY_CTRL5,
	FREQSEL_MASK,
	freqsel << FREQSEL_SHIFT);
	}

	/* Configure DLL TRIM */
	mask = DLL_TRIM_ICP_MASK;
	val = sdhci_am654->trm_icp << DLL_TRIM_ICP_SHIFT;

	/* Configure DLL driver strength */
	mask \|= DR_TY_MASK;
	val \|= sdhci_am654->drv_strength << DR_TY_SHIFT;
	regmap_update_bits(sdhci_am654->base, PHY_CTRL1, mask, val);
	/* Enable DLL */
	regmap_update_bits(sdhci_am654->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(sdhci_am654->base, PHY_STAT1,
	val, val & DLLRDY_MASK, 1000,
	1000000);
	if (ret) {
	dev_err(mmc_dev(host->mmc), "DLL failed to relock\n");
	return;
	}

	sdhci_am654->dll_on = true;
	}
	}

	static void sdhci_j721e_4bit_set_clock(struct sdhci_host *host,
	unsigned int clock)
	{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
	int val, mask;

	mask = OTAPDLYENA_MASK \| OTAPDLYSEL_MASK;
	val = (1 << OTAPDLYENA_SHIFT) \|
	(sdhci_am654->otap_del_sel << OTAPDLYSEL_SHIFT);
	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask, val);

	sdhci_set_clock(host, clock);
	}

	static void sdhci_am654_set_power(struct sdhci_host *host, unsigned char mode,
	unsigned short vdd)
	{
	if (!IS_ERR(host->mmc->supply.vmmc)) {
	struct mmc_host *mmc = host->mmc;

	mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
	}
	sdhci_set_power_noreg(host, mode, vdd);
	}

	static void sdhci_am654_write_b(struct sdhci_host *host, u8 val, int reg)
	{
	unsigned char timing = host->mmc->ios.timing;

	if (reg == SDHCI_HOST_CONTROL) {
	switch (timing) {
	/*
	* According to the data manual, HISPD bit
	* should not be set in these speed modes.
	*/
	case MMC_TIMING_SD_HS:
	case MMC_TIMING_MMC_HS:
	case MMC_TIMING_UHS_SDR12:
	case MMC_TIMING_UHS_SDR25:
	val &= ~SDHCI_CTRL_HISPD;
	}
	}

	writeb(val, host->ioaddr + reg);
	}

	static int sdhci_am654_execute_tuning(struct mmc_host *mmc, u32 opcode)
	{
	struct sdhci_host *host = mmc_priv(mmc);
	int err = sdhci_execute_tuning(mmc, opcode);

	if (err)
	return err;
	/*
	* Tuning data remains in the buffer after tuning.
	* Do a command and data reset to get rid of it
	*/
	sdhci_reset(host, SDHCI_RESET_CMD \| SDHCI_RESET_DATA);

	return 0;
	}

	static struct sdhci_ops sdhci_am654_ops = {
	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
	.get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
	.set_uhs_signaling = sdhci_set_uhs_signaling,
	.set_bus_width = sdhci_set_bus_width,
	.set_power = sdhci_am654_set_power,
	.set_clock = sdhci_am654_set_clock,
	.write_b = sdhci_am654_write_b,
	.reset = sdhci_reset,
	};

	static const struct sdhci_pltfm_data sdhci_am654_pdata = {
	.ops = &sdhci_am654_ops,
	.quirks = SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12,
	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
	};

	static const struct sdhci_am654_driver_data sdhci_am654_drvdata = {
	.pdata = &sdhci_am654_pdata,
	.flags = IOMUX_PRESENT \| FREQSEL_2_BIT \| STRBSEL_4_BIT \| DLL_PRESENT,
	};

	static struct sdhci_ops sdhci_j721e_8bit_ops = {
	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
	.get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
	.set_uhs_signaling = sdhci_set_uhs_signaling,
	.set_bus_width = sdhci_set_bus_width,
	.set_power = sdhci_am654_set_power,
	.set_clock = sdhci_am654_set_clock,
	.write_b = sdhci_am654_write_b,
	.reset = sdhci_reset,
	};

	static const struct sdhci_pltfm_data sdhci_j721e_8bit_pdata = {
	.ops = &sdhci_j721e_8bit_ops,
	.quirks = SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12,
	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
	};

	static const struct sdhci_am654_driver_data sdhci_j721e_8bit_drvdata = {
	.pdata = &sdhci_j721e_8bit_pdata,
	.flags = DLL_PRESENT,
	};

	static struct sdhci_ops sdhci_j721e_4bit_ops = {
	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
	.get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
	.set_uhs_signaling = sdhci_set_uhs_signaling,
	.set_bus_width = sdhci_set_bus_width,
	.set_power = sdhci_am654_set_power,
	.set_clock = sdhci_j721e_4bit_set_clock,
	.write_b = sdhci_am654_write_b,
	.reset = sdhci_reset,
	};

	static const struct sdhci_pltfm_data sdhci_j721e_4bit_pdata = {
	.ops = &sdhci_j721e_4bit_ops,
	.quirks = SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12,
	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
	};

	static const struct sdhci_am654_driver_data sdhci_j721e_4bit_drvdata = {
	.pdata = &sdhci_j721e_4bit_pdata,
	.flags = IOMUX_PRESENT,
	};
	static int sdhci_am654_init(struct sdhci_host *host)
	{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
	u32 ctl_cfg_2 = 0;
	u32 mask;
	u32 val;
	int ret;

	/* Reset OTAP to default value */
	mask = OTAPDLYENA_MASK \| OTAPDLYSEL_MASK;
	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask, 0x0);

	if (sdhci_am654->flags & DLL_PRESENT) {
	regmap_read(sdhci_am654->base, PHY_STAT1, &val);
	if (~val & CALDONE_MASK) {
	/* Calibrate IO lines */
	regmap_update_bits(sdhci_am654->base, PHY_CTRL1,
	PDB_MASK, PDB_MASK);
	ret = regmap_read_poll_timeout(sdhci_am654->base,
	PHY_STAT1, val,
	val & CALDONE_MASK,
	1, 20);
	if (ret)
	return ret;
	}
	}

	/* Enable pins by setting IO mux to 0 */
	if (sdhci_am654->flags & IOMUX_PRESENT)
	regmap_update_bits(sdhci_am654->base, PHY_CTRL1,
	IOMUX_ENABLE_MASK, 0);

	/* Set slot type based on SD or eMMC */
	if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
	ctl_cfg_2 = SLOTTYPE_EMBEDDED;

	regmap_update_bits(sdhci_am654->base, CTL_CFG_2, SLOTTYPE_MASK,
	ctl_cfg_2);

	return sdhci_add_host(host);
	}

	static int sdhci_am654_get_of_property(struct platform_device *pdev,
	struct sdhci_am654_data *sdhci_am654)
	{
	struct device *dev = &pdev->dev;
	int drv_strength;
	int ret;

	ret = device_property_read_u32(dev, "ti,otap-del-sel",
	&sdhci_am654->otap_del_sel);
	if (ret)
	return ret;

	if (sdhci_am654->flags & DLL_PRESENT) {
	ret = device_property_read_u32(dev, "ti,trm-icp",
	&sdhci_am654->trm_icp);
	if (ret)
	return ret;

	ret = device_property_read_u32(dev, "ti,driver-strength-ohm",
	&drv_strength);
	if (ret)
	return ret;

	switch (drv_strength) {
	case 50:
	sdhci_am654->drv_strength = DRIVER_STRENGTH_50_OHM;
	break;
	case 33:
	sdhci_am654->drv_strength = DRIVER_STRENGTH_33_OHM;
	break;
	case 66:
	sdhci_am654->drv_strength = DRIVER_STRENGTH_66_OHM;
	break;
	case 100:
	sdhci_am654->drv_strength = DRIVER_STRENGTH_100_OHM;
	break;
	case 40:
	sdhci_am654->drv_strength = DRIVER_STRENGTH_40_OHM;
	break;
	default:
	dev_err(dev, "Invalid driver strength\n");
	return -EINVAL;
	}
	}

	device_property_read_u32(dev, "ti,strobe-sel", &sdhci_am654->strb_sel);

	sdhci_get_of_property(pdev);

	return 0;
	}

	static const struct of_device_id sdhci_am654_of_match[] = {
	{
	.compatible = "ti,am654-sdhci-5.1",
	.data = &sdhci_am654_drvdata,
	},
	{
	.compatible = "ti,j721e-sdhci-8bit",
	.data = &sdhci_j721e_8bit_drvdata,
	},
	{
	.compatible = "ti,j721e-sdhci-4bit",
	.data = &sdhci_j721e_4bit_drvdata,
	},
	{ /* sentinel */ }
	};

	static int sdhci_am654_probe(struct platform_device *pdev)
	{
	const struct sdhci_am654_driver_data *drvdata;
	struct sdhci_pltfm_host *pltfm_host;
	struct sdhci_am654_data *sdhci_am654;
	const struct of_device_id *match;
	struct sdhci_host *host;
	struct resource *res;
	struct clk *clk_xin;
	struct device *dev = &pdev->dev;
	void __iomem *base;
	int ret;

	match = of_match_node(sdhci_am654_of_match, pdev->dev.of_node);
	drvdata = match->data;
	host = sdhci_pltfm_init(pdev, drvdata->pdata, sizeof(*sdhci_am654));
	if (IS_ERR(host))
	return PTR_ERR(host);

	pltfm_host = sdhci_priv(host);
	sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
	sdhci_am654->flags = drvdata->flags;

	clk_xin = devm_clk_get(dev, "clk_xin");
	if (IS_ERR(clk_xin)) {
	dev_err(dev, "clk_xin clock not found.\n");
	ret = PTR_ERR(clk_xin);
	goto err_pltfm_free;
	}

	pltfm_host->clk = clk_xin;

	/* Clocks are enabled using pm_runtime */
	pm_runtime_enable(dev);
	ret = pm_runtime_get_sync(dev);
	if (ret < 0) {
	pm_runtime_put_noidle(dev);
	goto pm_runtime_disable;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	base = devm_ioremap_resource(dev, res);
	if (IS_ERR(base)) {
	ret = PTR_ERR(base);
	goto pm_runtime_put;
	}

	sdhci_am654->base = devm_regmap_init_mmio(dev, base,
	&sdhci_am654_regmap_config);
	if (IS_ERR(sdhci_am654->base)) {
	dev_err(dev, "Failed to initialize regmap\n");
	ret = PTR_ERR(sdhci_am654->base);
	goto pm_runtime_put;
	}

	ret = sdhci_am654_get_of_property(pdev, sdhci_am654);
	if (ret)
	goto pm_runtime_put;

	ret = mmc_of_parse(host->mmc);
	if (ret) {
	dev_err(dev, "parsing dt failed (%d)\n", ret);
	goto pm_runtime_put;
	}

	host->mmc_host_ops.execute_tuning = sdhci_am654_execute_tuning;

	ret = sdhci_am654_init(host);
	if (ret)
	goto pm_runtime_put;

	return 0;

	pm_runtime_put:
	pm_runtime_put_sync(dev);
	pm_runtime_disable:
	pm_runtime_disable(dev);
	err_pltfm_free:
	sdhci_pltfm_free(pdev);
	return ret;
	}

	static int sdhci_am654_remove(struct platform_device *pdev)
	{
	struct sdhci_host *host = platform_get_drvdata(pdev);
	int ret;

	sdhci_remove_host(host, true);
	ret = pm_runtime_put_sync(&pdev->dev);
	if (ret < 0)
	return ret;

	pm_runtime_disable(&pdev->dev);
	sdhci_pltfm_free(pdev);

	return 0;
	}

	static struct platform_driver sdhci_am654_driver = {
	.driver = {
	.name = "sdhci-am654",
	.of_match_table = sdhci_am654_of_match,
	},
	.probe = sdhci_am654_probe,
	.remove = sdhci_am654_remove,
	};

	module_platform_driver(sdhci_am654_driver);

	MODULE_DESCRIPTION("Driver for SDHCI Controller on TI's AM654 devices");
	MODULE_AUTHOR("Faiz Abbas <faiz_abbas@ti.com>");
	MODULE_LICENSE("GPL");