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>

 /* 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_MASK		GENMASK(27, 24)
 #define SEL50_SHIFT		8
 #define SEL50_MASK		BIT(SEL50_SHIFT)
 #define SEL100_SHIFT		9
 #define SEL100_MASK		BIT(SEL100_SHIFT)
 #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;
 	u32 trm_icp;
 	u32 drv_strength;
 	bool dll_on;
 };

 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_platdata(dev);
 	unsigned int speed = host->mmc->clock;
 	int sel50, sel100;
 	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) {
 		mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK;
 		val = (1 << OTAPDLYENA_SHIFT) |
 		      (plat->otap_del_sel << OTAPDLYSEL_SHIFT);
 		regmap_update_bits(plat->base, PHY_CTRL4, mask, val);
 		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);

 		/* 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;
 }

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

 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);

 	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 */
 	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;
 }

 static int am654_sdhci_probe(struct udevice *dev)
 {
 	struct am654_sdhci_plat *plat = dev_get_platdata(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 power_domain sdhci_pwrdmn;
 	struct clk clk;
 	unsigned long clock;
 	int ret;

 	ret = power_domain_get_by_index(dev, &sdhci_pwrdmn, 0);
 	if (!ret) {
 		ret = power_domain_on(&sdhci_pwrdmn);
 		if (ret) {
 			dev_err(dev, "Power domain on failed (%d)\n", ret);
 			return ret;
 		}
 	} else if (ret != -ENOENT && ret != -ENODEV && ret != -ENOSYS) {
 		dev_err(dev, "failed to get power domain (%d)\n", ret);
 		return ret;
 	}

 	ret = clk_get_by_index(dev, 0, &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;
 	host->ops = &am654_sdhci_ops;
 	host->mmc->priv = host;
 	upriv->mmc = host->mmc;

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

 	am654_sdhci_init(plat);

 	return sdhci_probe(dev);
 }

 static int am654_sdhci_ofdata_to_platdata(struct udevice *dev)
 {
 	struct am654_sdhci_plat *plat = dev_get_platdata(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");

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

 	ret = dev_read_u32(dev, "ti,otap-del-sel", &plat->otap_del_sel);
 	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_sdhci_plat *plat = dev_get_platdata(dev);

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

 static const struct udevice_id am654_sdhci_ids[] = {
 	{ .compatible = "ti,am654-sdhci-5.1" },
 	{ }
 };

 U_BOOT_DRIVER(am654_sdhci_drv) = {
 	.name		= "am654_sdhci",
 	.id		= UCLASS_MMC,
 	.of_match	= am654_sdhci_ids,
 	.ofdata_to_platdata = am654_sdhci_ofdata_to_platdata,
 	.ops		= &sdhci_ops,
 	.bind		= am654_sdhci_bind,
 	.probe		= am654_sdhci_probe,
 	.priv_auto_alloc_size = sizeof(struct sdhci_host),
 	.platdata_auto_alloc_size = 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>

	/* 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_MASK GENMASK(27, 24)
	#define SEL50_SHIFT 8
	#define SEL50_MASK BIT(SEL50_SHIFT)
	#define SEL100_SHIFT 9
	#define SEL100_MASK BIT(SEL100_SHIFT)
	#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;
	u32 trm_icp;
	u32 drv_strength;
	bool dll_on;
	};

	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_platdata(dev);
	unsigned int speed = host->mmc->clock;
	int sel50, sel100;
	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) {
	mask = OTAPDLYENA_MASK \| OTAPDLYSEL_MASK;
	val = (1 << OTAPDLYENA_SHIFT) \|
	(plat->otap_del_sel << OTAPDLYSEL_SHIFT);
	regmap_update_bits(plat->base, PHY_CTRL4, mask, val);
	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);

	/* 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;
	}

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

	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);

	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 */
	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;
	}

	static int am654_sdhci_probe(struct udevice *dev)
	{
	struct am654_sdhci_plat *plat = dev_get_platdata(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 power_domain sdhci_pwrdmn;
	struct clk clk;
	unsigned long clock;
	int ret;

	ret = power_domain_get_by_index(dev, &sdhci_pwrdmn, 0);
	if (!ret) {
	ret = power_domain_on(&sdhci_pwrdmn);
	if (ret) {
	dev_err(dev, "Power domain on failed (%d)\n", ret);
	return ret;
	}
	} else if (ret != -ENOENT && ret != -ENODEV && ret != -ENOSYS) {
	dev_err(dev, "failed to get power domain (%d)\n", ret);
	return ret;
	}

	ret = clk_get_by_index(dev, 0, &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;
	host->ops = &am654_sdhci_ops;
	host->mmc->priv = host;
	upriv->mmc = host->mmc;

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

	am654_sdhci_init(plat);

	return sdhci_probe(dev);
	}

	static int am654_sdhci_ofdata_to_platdata(struct udevice *dev)
	{
	struct am654_sdhci_plat *plat = dev_get_platdata(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");

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

	ret = dev_read_u32(dev, "ti,otap-del-sel", &plat->otap_del_sel);
	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_sdhci_plat *plat = dev_get_platdata(dev);

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

	static const struct udevice_id am654_sdhci_ids[] = {
	{ .compatible = "ti,am654-sdhci-5.1" },
	{ }
	};

	U_BOOT_DRIVER(am654_sdhci_drv) = {
	.name = "am654_sdhci",
	.id = UCLASS_MMC,
	.of_match = am654_sdhci_ids,
	.ofdata_to_platdata = am654_sdhci_ofdata_to_platdata,
	.ops = &sdhci_ops,
	.bind = am654_sdhci_bind,
	.probe = am654_sdhci_probe,
	.priv_auto_alloc_size = sizeof(struct sdhci_host),
	.platdata_auto_alloc_size = sizeof(struct am654_sdhci_plat),
	};