drivers/phy/qualcomm/phy-qcom-snps-eusb2.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2023, Linaro Limited
  */

 #include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/iopoll.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>
 #include <linux/reset.h>

 #define USB_PHY_UTMI_CTRL0		(0x3c)
 #define SLEEPM				BIT(0)
 #define OPMODE_MASK			GENMASK(4, 3)
 #define OPMODE_NONDRIVING		BIT(3)

 #define USB_PHY_UTMI_CTRL5		(0x50)
 #define POR				BIT(1)

 #define USB_PHY_HS_PHY_CTRL_COMMON0	(0x54)
 #define PHY_ENABLE			BIT(0)
 #define SIDDQ_SEL			BIT(1)
 #define SIDDQ				BIT(2)
 #define RETENABLEN			BIT(3)
 #define FSEL_MASK			GENMASK(6, 4)
 #define FSEL_19_2_MHZ_VAL		(0x0)
 #define FSEL_38_4_MHZ_VAL		(0x4)

 #define USB_PHY_CFG_CTRL_1		(0x58)
 #define PHY_CFG_PLL_CPBIAS_CNTRL_MASK	GENMASK(7, 1)

 #define USB_PHY_CFG_CTRL_2		(0x5c)
 #define PHY_CFG_PLL_FB_DIV_7_0_MASK	GENMASK(7, 0)
 #define DIV_7_0_19_2_MHZ_VAL		(0x90)
 #define DIV_7_0_38_4_MHZ_VAL		(0xc8)

 #define USB_PHY_CFG_CTRL_3		(0x60)
 #define PHY_CFG_PLL_FB_DIV_11_8_MASK	GENMASK(3, 0)
 #define DIV_11_8_19_2_MHZ_VAL		(0x1)
 #define DIV_11_8_38_4_MHZ_VAL		(0x0)

 #define PHY_CFG_PLL_REF_DIV		GENMASK(7, 4)
 #define PLL_REF_DIV_VAL			(0x0)

 #define USB_PHY_HS_PHY_CTRL2		(0x64)
 #define VBUSVLDEXT0			BIT(0)
 #define USB2_SUSPEND_N			BIT(2)
 #define USB2_SUSPEND_N_SEL		BIT(3)
 #define VBUS_DET_EXT_SEL		BIT(4)

 #define USB_PHY_CFG_CTRL_4		(0x68)
 #define PHY_CFG_PLL_GMP_CNTRL_MASK	GENMASK(1, 0)
 #define PHY_CFG_PLL_INT_CNTRL_MASK	GENMASK(7, 2)

 #define USB_PHY_CFG_CTRL_5		(0x6c)
 #define PHY_CFG_PLL_PROP_CNTRL_MASK	GENMASK(4, 0)
 #define PHY_CFG_PLL_VREF_TUNE_MASK	GENMASK(7, 6)

 #define USB_PHY_CFG_CTRL_6		(0x70)
 #define PHY_CFG_PLL_VCO_CNTRL_MASK	GENMASK(2, 0)

 #define USB_PHY_CFG_CTRL_7		(0x74)

 #define USB_PHY_CFG_CTRL_8		(0x78)
 #define PHY_CFG_TX_FSLS_VREF_TUNE_MASK	GENMASK(1, 0)
 #define PHY_CFG_TX_FSLS_VREG_BYPASS	BIT(2)
 #define PHY_CFG_TX_HS_VREF_TUNE_MASK	GENMASK(5, 3)
 #define PHY_CFG_TX_HS_XV_TUNE_MASK	GENMASK(7, 6)

 #define USB_PHY_CFG_CTRL_9		(0x7c)
 #define PHY_CFG_TX_PREEMP_TUNE_MASK	GENMASK(2, 0)
 #define PHY_CFG_TX_RES_TUNE_MASK	GENMASK(4, 3)
 #define PHY_CFG_TX_RISE_TUNE_MASK	GENMASK(6, 5)
 #define PHY_CFG_RCAL_BYPASS		BIT(7)

 #define USB_PHY_CFG_CTRL_10		(0x80)

 #define USB_PHY_CFG0			(0x94)
 #define DATAPATH_CTRL_OVERRIDE_EN	BIT(0)
 #define CMN_CTRL_OVERRIDE_EN		BIT(1)

 #define UTMI_PHY_CMN_CTRL0		(0x98)
 #define TESTBURNIN			BIT(6)

 #define USB_PHY_FSEL_SEL		(0xb8)
 #define FSEL_SEL			BIT(0)

 #define USB_PHY_APB_ACCESS_CMD		(0x130)
 #define RW_ACCESS			BIT(0)
 #define APB_START_CMD			BIT(1)
 #define APB_LOGIC_RESET			BIT(2)

 #define USB_PHY_APB_ACCESS_STATUS	(0x134)
 #define ACCESS_DONE			BIT(0)
 #define TIMED_OUT			BIT(1)
 #define ACCESS_ERROR			BIT(2)
 #define ACCESS_IN_PROGRESS		BIT(3)

 #define USB_PHY_APB_ADDRESS		(0x138)
 #define APB_REG_ADDR_MASK		GENMASK(7, 0)

 #define USB_PHY_APB_WRDATA_LSB		(0x13c)
 #define APB_REG_WRDATA_7_0_MASK		GENMASK(3, 0)

 #define USB_PHY_APB_WRDATA_MSB		(0x140)
 #define APB_REG_WRDATA_15_8_MASK	GENMASK(7, 4)

 #define USB_PHY_APB_RDDATA_LSB		(0x144)
 #define APB_REG_RDDATA_7_0_MASK		GENMASK(3, 0)

 #define USB_PHY_APB_RDDATA_MSB		(0x148)
 #define APB_REG_RDDATA_15_8_MASK	GENMASK(7, 4)

 static const char * const eusb2_hsphy_vreg_names[] = {
 	"vdd", "vdda12",
 };

 #define EUSB2_NUM_VREGS		ARRAY_SIZE(eusb2_hsphy_vreg_names)

 struct qcom_snps_eusb2_hsphy {
 	struct phy *phy;
 	void __iomem *base;

 	struct clk *ref_clk;
 	struct reset_control *phy_reset;

 	struct regulator_bulk_data vregs[EUSB2_NUM_VREGS];

 	enum phy_mode mode;

 	struct phy *repeater;
 };

 static int qcom_snps_eusb2_hsphy_set_mode(struct phy *p, enum phy_mode mode, int submode)
 {
 	struct qcom_snps_eusb2_hsphy *phy = phy_get_drvdata(p);

 	phy->mode = mode;

 	return phy_set_mode_ext(phy->repeater, mode, submode);
 }

 static void qcom_snps_eusb2_hsphy_write_mask(void __iomem *base, u32 offset,
 					     u32 mask, u32 val)
 {
 	u32 reg;

 	reg = readl_relaxed(base + offset);
 	reg &= ~mask;
 	reg |= val & mask;
 	writel_relaxed(reg, base + offset);

 	/* Ensure above write is completed */
 	readl_relaxed(base + offset);
 }

 static void qcom_eusb2_default_parameters(struct qcom_snps_eusb2_hsphy *phy)
 {
 	/* default parameters: tx pre-emphasis */
 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_9,
 					 PHY_CFG_TX_PREEMP_TUNE_MASK,
 					 FIELD_PREP(PHY_CFG_TX_PREEMP_TUNE_MASK, 0));

 	/* tx rise/fall time */
 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_9,
 					 PHY_CFG_TX_RISE_TUNE_MASK,
 					 FIELD_PREP(PHY_CFG_TX_RISE_TUNE_MASK, 0x2));

 	/* source impedance adjustment */
 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_9,
 					 PHY_CFG_TX_RES_TUNE_MASK,
 					 FIELD_PREP(PHY_CFG_TX_RES_TUNE_MASK, 0x1));

 	/* dc voltage level adjustement */
 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_8,
 					 PHY_CFG_TX_HS_VREF_TUNE_MASK,
 					 FIELD_PREP(PHY_CFG_TX_HS_VREF_TUNE_MASK, 0x3));

 	/* transmitter HS crossover adjustement */
 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_8,
 					 PHY_CFG_TX_HS_XV_TUNE_MASK,
 					 FIELD_PREP(PHY_CFG_TX_HS_XV_TUNE_MASK, 0x0));
 }

 static int qcom_eusb2_ref_clk_init(struct qcom_snps_eusb2_hsphy *phy)
 {
 	unsigned long ref_clk_freq = clk_get_rate(phy->ref_clk);

 	switch (ref_clk_freq) {
 	case 19200000:
 		qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
 						 FSEL_MASK,
 						 FIELD_PREP(FSEL_MASK, FSEL_19_2_MHZ_VAL));

 		qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_2,
 						 PHY_CFG_PLL_FB_DIV_7_0_MASK,
 						 DIV_7_0_19_2_MHZ_VAL);

 		qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_3,
 						 PHY_CFG_PLL_FB_DIV_11_8_MASK,
 						 DIV_11_8_19_2_MHZ_VAL);
 		break;

 	case 38400000:
 		qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
 						 FSEL_MASK,
 						 FIELD_PREP(FSEL_MASK, FSEL_38_4_MHZ_VAL));

 		qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_2,
 						 PHY_CFG_PLL_FB_DIV_7_0_MASK,
 						 DIV_7_0_38_4_MHZ_VAL);

 		qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_3,
 						 PHY_CFG_PLL_FB_DIV_11_8_MASK,
 						 DIV_11_8_38_4_MHZ_VAL);
 		break;

 	default:
 		dev_err(&phy->phy->dev, "unsupported ref_clk_freq:%lu\n", ref_clk_freq);
 		return -EINVAL;
 	}

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_3,
 					 PHY_CFG_PLL_REF_DIV, PLL_REF_DIV_VAL);

 	return 0;
 }

 static int qcom_snps_eusb2_hsphy_init(struct phy *p)
 {
 	struct qcom_snps_eusb2_hsphy *phy = phy_get_drvdata(p);
 	int ret;

 	ret = regulator_bulk_enable(ARRAY_SIZE(phy->vregs), phy->vregs);
 	if (ret)
 		return ret;

 	ret = phy_init(phy->repeater);
 	if (ret) {
 		dev_err(&p->dev, "repeater init failed. %d\n", ret);
 		goto disable_vreg;
 	}

 	ret = clk_prepare_enable(phy->ref_clk);
 	if (ret) {
 		dev_err(&p->dev, "failed to enable ref clock, %d\n", ret);
 		goto disable_vreg;
 	}

 	ret = reset_control_assert(phy->phy_reset);
 	if (ret) {
 		dev_err(&p->dev, "failed to assert phy_reset, %d\n", ret);
 		goto disable_ref_clk;
 	}

 	usleep_range(100, 150);

 	ret = reset_control_deassert(phy->phy_reset);
 	if (ret) {
 		dev_err(&p->dev, "failed to de-assert phy_reset, %d\n", ret);
 		goto disable_ref_clk;
 	}

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG0,
 					 CMN_CTRL_OVERRIDE_EN, CMN_CTRL_OVERRIDE_EN);

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_UTMI_CTRL5, POR, POR);

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
 					 PHY_ENABLE | RETENABLEN, PHY_ENABLE | RETENABLEN);

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_APB_ACCESS_CMD,
 					 APB_LOGIC_RESET, APB_LOGIC_RESET);

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, UTMI_PHY_CMN_CTRL0, TESTBURNIN, 0);

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_FSEL_SEL,
 					 FSEL_SEL, FSEL_SEL);

 	/* update ref_clk related registers */
 	ret = qcom_eusb2_ref_clk_init(phy);
 	if (ret)
 		goto disable_ref_clk;

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_1,
 					 PHY_CFG_PLL_CPBIAS_CNTRL_MASK,
 					 FIELD_PREP(PHY_CFG_PLL_CPBIAS_CNTRL_MASK, 0x1));

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_4,
 					 PHY_CFG_PLL_INT_CNTRL_MASK,
 					 FIELD_PREP(PHY_CFG_PLL_INT_CNTRL_MASK, 0x8));

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_4,
 					 PHY_CFG_PLL_GMP_CNTRL_MASK,
 					 FIELD_PREP(PHY_CFG_PLL_GMP_CNTRL_MASK, 0x1));

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_5,
 					 PHY_CFG_PLL_PROP_CNTRL_MASK,
 					 FIELD_PREP(PHY_CFG_PLL_PROP_CNTRL_MASK, 0x10));

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_6,
 					 PHY_CFG_PLL_VCO_CNTRL_MASK,
 					 FIELD_PREP(PHY_CFG_PLL_VCO_CNTRL_MASK, 0x0));

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_5,
 					 PHY_CFG_PLL_VREF_TUNE_MASK,
 					 FIELD_PREP(PHY_CFG_PLL_VREF_TUNE_MASK, 0x1));

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL2,
 					 VBUS_DET_EXT_SEL, VBUS_DET_EXT_SEL);

 	/* set default parameters */
 	qcom_eusb2_default_parameters(phy);

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL2,
 					 USB2_SUSPEND_N_SEL | USB2_SUSPEND_N,
 					 USB2_SUSPEND_N_SEL | USB2_SUSPEND_N);

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_UTMI_CTRL0, SLEEPM, SLEEPM);

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
 					 SIDDQ_SEL, SIDDQ_SEL);

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
 					 SIDDQ, 0);

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_UTMI_CTRL5, POR, 0);

 	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL2,
 					 USB2_SUSPEND_N_SEL, 0);

 	return 0;

 disable_ref_clk:
 	clk_disable_unprepare(phy->ref_clk);

 disable_vreg:
 	regulator_bulk_disable(ARRAY_SIZE(phy->vregs), phy->vregs);

 	return ret;
 }

 static int qcom_snps_eusb2_hsphy_exit(struct phy *p)
 {
 	struct qcom_snps_eusb2_hsphy *phy = phy_get_drvdata(p);

 	clk_disable_unprepare(phy->ref_clk);

 	regulator_bulk_disable(ARRAY_SIZE(phy->vregs), phy->vregs);

 	phy_exit(phy->repeater);

 	return 0;
 }

 static const struct phy_ops qcom_snps_eusb2_hsphy_ops = {
 	.init		= qcom_snps_eusb2_hsphy_init,
 	.exit		= qcom_snps_eusb2_hsphy_exit,
 	.set_mode	= qcom_snps_eusb2_hsphy_set_mode,
 	.owner		= THIS_MODULE,
 };

 static int qcom_snps_eusb2_hsphy_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
 	struct qcom_snps_eusb2_hsphy *phy;
 	struct phy_provider *phy_provider;
 	struct phy *generic_phy;
 	int ret, i;
 	int num;

 	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
 	if (!phy)
 		return -ENOMEM;

 	phy->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(phy->base))
 		return PTR_ERR(phy->base);

 	phy->phy_reset = devm_reset_control_get_exclusive(dev, NULL);
 	if (IS_ERR(phy->phy_reset))
 		return PTR_ERR(phy->phy_reset);

 	phy->ref_clk = devm_clk_get(dev, "ref");
 	if (IS_ERR(phy->ref_clk))
 		return dev_err_probe(dev, PTR_ERR(phy->ref_clk),
 				     "failed to get ref clk\n");

 	num = ARRAY_SIZE(phy->vregs);
 	for (i = 0; i < num; i++)
 		phy->vregs[i].supply = eusb2_hsphy_vreg_names[i];

 	ret = devm_regulator_bulk_get(dev, num, phy->vregs);
 	if (ret)
 		return dev_err_probe(dev, ret,
 				     "failed to get regulator supplies\n");

 	phy->repeater = devm_of_phy_get_by_index(dev, np, 0);
 	if (IS_ERR(phy->repeater))
 		return dev_err_probe(dev, PTR_ERR(phy->repeater),
 				     "failed to get repeater\n");

 	generic_phy = devm_phy_create(dev, NULL, &qcom_snps_eusb2_hsphy_ops);
 	if (IS_ERR(generic_phy)) {
 		dev_err(dev, "failed to create phy %d\n", ret);
 		return PTR_ERR(generic_phy);
 	}

 	dev_set_drvdata(dev, phy);
 	phy_set_drvdata(generic_phy, phy);

 	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 	if (IS_ERR(phy_provider))
 		return PTR_ERR(phy_provider);

 	dev_info(dev, "Registered Qcom-eUSB2 phy\n");

 	return 0;
 }

 static const struct of_device_id qcom_snps_eusb2_hsphy_of_match_table[] = {
 	{ .compatible = "qcom,sm8550-snps-eusb2-phy", },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, qcom_snps_eusb2_hsphy_of_match_table);

 static struct platform_driver qcom_snps_eusb2_hsphy_driver = {
 	.probe		= qcom_snps_eusb2_hsphy_probe,
 	.driver = {
 		.name	= "qcom-snps-eusb2-hsphy",
 		.of_match_table = qcom_snps_eusb2_hsphy_of_match_table,
 	},
 };

 module_platform_driver(qcom_snps_eusb2_hsphy_driver);
 MODULE_DESCRIPTION("Qualcomm SNPS eUSB2 HS PHY driver");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (c) 2023, Linaro Limited
	*/

	#include <linux/bitfield.h>
	#include <linux/clk.h>
	#include <linux/delay.h>
	#include <linux/iopoll.h>
	#include <linux/phy/phy.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/consumer.h>
	#include <linux/reset.h>

	#define USB_PHY_UTMI_CTRL0 (0x3c)
	#define SLEEPM BIT(0)
	#define OPMODE_MASK GENMASK(4, 3)
	#define OPMODE_NONDRIVING BIT(3)

	#define USB_PHY_UTMI_CTRL5 (0x50)
	#define POR BIT(1)

	#define USB_PHY_HS_PHY_CTRL_COMMON0 (0x54)
	#define PHY_ENABLE BIT(0)
	#define SIDDQ_SEL BIT(1)
	#define SIDDQ BIT(2)
	#define RETENABLEN BIT(3)
	#define FSEL_MASK GENMASK(6, 4)
	#define FSEL_19_2_MHZ_VAL (0x0)
	#define FSEL_38_4_MHZ_VAL (0x4)

	#define USB_PHY_CFG_CTRL_1 (0x58)
	#define PHY_CFG_PLL_CPBIAS_CNTRL_MASK GENMASK(7, 1)

	#define USB_PHY_CFG_CTRL_2 (0x5c)
	#define PHY_CFG_PLL_FB_DIV_7_0_MASK GENMASK(7, 0)
	#define DIV_7_0_19_2_MHZ_VAL (0x90)
	#define DIV_7_0_38_4_MHZ_VAL (0xc8)

	#define USB_PHY_CFG_CTRL_3 (0x60)
	#define PHY_CFG_PLL_FB_DIV_11_8_MASK GENMASK(3, 0)
	#define DIV_11_8_19_2_MHZ_VAL (0x1)
	#define DIV_11_8_38_4_MHZ_VAL (0x0)

	#define PHY_CFG_PLL_REF_DIV GENMASK(7, 4)
	#define PLL_REF_DIV_VAL (0x0)

	#define USB_PHY_HS_PHY_CTRL2 (0x64)
	#define VBUSVLDEXT0 BIT(0)
	#define USB2_SUSPEND_N BIT(2)
	#define USB2_SUSPEND_N_SEL BIT(3)
	#define VBUS_DET_EXT_SEL BIT(4)

	#define USB_PHY_CFG_CTRL_4 (0x68)
	#define PHY_CFG_PLL_GMP_CNTRL_MASK GENMASK(1, 0)
	#define PHY_CFG_PLL_INT_CNTRL_MASK GENMASK(7, 2)

	#define USB_PHY_CFG_CTRL_5 (0x6c)
	#define PHY_CFG_PLL_PROP_CNTRL_MASK GENMASK(4, 0)
	#define PHY_CFG_PLL_VREF_TUNE_MASK GENMASK(7, 6)

	#define USB_PHY_CFG_CTRL_6 (0x70)
	#define PHY_CFG_PLL_VCO_CNTRL_MASK GENMASK(2, 0)

	#define USB_PHY_CFG_CTRL_7 (0x74)

	#define USB_PHY_CFG_CTRL_8 (0x78)
	#define PHY_CFG_TX_FSLS_VREF_TUNE_MASK GENMASK(1, 0)
	#define PHY_CFG_TX_FSLS_VREG_BYPASS BIT(2)
	#define PHY_CFG_TX_HS_VREF_TUNE_MASK GENMASK(5, 3)
	#define PHY_CFG_TX_HS_XV_TUNE_MASK GENMASK(7, 6)

	#define USB_PHY_CFG_CTRL_9 (0x7c)
	#define PHY_CFG_TX_PREEMP_TUNE_MASK GENMASK(2, 0)
	#define PHY_CFG_TX_RES_TUNE_MASK GENMASK(4, 3)
	#define PHY_CFG_TX_RISE_TUNE_MASK GENMASK(6, 5)
	#define PHY_CFG_RCAL_BYPASS BIT(7)

	#define USB_PHY_CFG_CTRL_10 (0x80)

	#define USB_PHY_CFG0 (0x94)
	#define DATAPATH_CTRL_OVERRIDE_EN BIT(0)
	#define CMN_CTRL_OVERRIDE_EN BIT(1)

	#define UTMI_PHY_CMN_CTRL0 (0x98)
	#define TESTBURNIN BIT(6)

	#define USB_PHY_FSEL_SEL (0xb8)
	#define FSEL_SEL BIT(0)

	#define USB_PHY_APB_ACCESS_CMD (0x130)
	#define RW_ACCESS BIT(0)
	#define APB_START_CMD BIT(1)
	#define APB_LOGIC_RESET BIT(2)

	#define USB_PHY_APB_ACCESS_STATUS (0x134)
	#define ACCESS_DONE BIT(0)
	#define TIMED_OUT BIT(1)
	#define ACCESS_ERROR BIT(2)
	#define ACCESS_IN_PROGRESS BIT(3)

	#define USB_PHY_APB_ADDRESS (0x138)
	#define APB_REG_ADDR_MASK GENMASK(7, 0)

	#define USB_PHY_APB_WRDATA_LSB (0x13c)
	#define APB_REG_WRDATA_7_0_MASK GENMASK(3, 0)

	#define USB_PHY_APB_WRDATA_MSB (0x140)
	#define APB_REG_WRDATA_15_8_MASK GENMASK(7, 4)

	#define USB_PHY_APB_RDDATA_LSB (0x144)
	#define APB_REG_RDDATA_7_0_MASK GENMASK(3, 0)

	#define USB_PHY_APB_RDDATA_MSB (0x148)
	#define APB_REG_RDDATA_15_8_MASK GENMASK(7, 4)

	static const char * const eusb2_hsphy_vreg_names[] = {
	"vdd", "vdda12",
	};

	#define EUSB2_NUM_VREGS ARRAY_SIZE(eusb2_hsphy_vreg_names)

	struct qcom_snps_eusb2_hsphy {
	struct phy *phy;
	void __iomem *base;

	struct clk *ref_clk;
	struct reset_control *phy_reset;

	struct regulator_bulk_data vregs[EUSB2_NUM_VREGS];

	enum phy_mode mode;

	struct phy *repeater;
	};

	static int qcom_snps_eusb2_hsphy_set_mode(struct phy *p, enum phy_mode mode, int submode)
	{
	struct qcom_snps_eusb2_hsphy *phy = phy_get_drvdata(p);

	phy->mode = mode;

	return phy_set_mode_ext(phy->repeater, mode, submode);
	}

	static void qcom_snps_eusb2_hsphy_write_mask(void __iomem *base, u32 offset,
	u32 mask, u32 val)
	{
	u32 reg;

	reg = readl_relaxed(base + offset);
	reg &= ~mask;
	reg \|= val & mask;
	writel_relaxed(reg, base + offset);

	/* Ensure above write is completed */
	readl_relaxed(base + offset);
	}

	static void qcom_eusb2_default_parameters(struct qcom_snps_eusb2_hsphy *phy)
	{
	/* default parameters: tx pre-emphasis */
	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_9,
	PHY_CFG_TX_PREEMP_TUNE_MASK,
	FIELD_PREP(PHY_CFG_TX_PREEMP_TUNE_MASK, 0));

	/* tx rise/fall time */
	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_9,
	PHY_CFG_TX_RISE_TUNE_MASK,
	FIELD_PREP(PHY_CFG_TX_RISE_TUNE_MASK, 0x2));

	/* source impedance adjustment */
	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_9,
	PHY_CFG_TX_RES_TUNE_MASK,
	FIELD_PREP(PHY_CFG_TX_RES_TUNE_MASK, 0x1));

	/* dc voltage level adjustement */
	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_8,
	PHY_CFG_TX_HS_VREF_TUNE_MASK,
	FIELD_PREP(PHY_CFG_TX_HS_VREF_TUNE_MASK, 0x3));

	/* transmitter HS crossover adjustement */
	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_8,
	PHY_CFG_TX_HS_XV_TUNE_MASK,
	FIELD_PREP(PHY_CFG_TX_HS_XV_TUNE_MASK, 0x0));
	}

	static int qcom_eusb2_ref_clk_init(struct qcom_snps_eusb2_hsphy *phy)
	{
	unsigned long ref_clk_freq = clk_get_rate(phy->ref_clk);

	switch (ref_clk_freq) {
	case 19200000:
	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
	FSEL_MASK,
	FIELD_PREP(FSEL_MASK, FSEL_19_2_MHZ_VAL));

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_2,
	PHY_CFG_PLL_FB_DIV_7_0_MASK,
	DIV_7_0_19_2_MHZ_VAL);

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_3,
	PHY_CFG_PLL_FB_DIV_11_8_MASK,
	DIV_11_8_19_2_MHZ_VAL);
	break;

	case 38400000:
	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
	FSEL_MASK,
	FIELD_PREP(FSEL_MASK, FSEL_38_4_MHZ_VAL));

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_2,
	PHY_CFG_PLL_FB_DIV_7_0_MASK,
	DIV_7_0_38_4_MHZ_VAL);

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_3,
	PHY_CFG_PLL_FB_DIV_11_8_MASK,
	DIV_11_8_38_4_MHZ_VAL);
	break;

	default:
	dev_err(&phy->phy->dev, "unsupported ref_clk_freq:%lu\n", ref_clk_freq);
	return -EINVAL;
	}

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_3,
	PHY_CFG_PLL_REF_DIV, PLL_REF_DIV_VAL);

	return 0;
	}

	static int qcom_snps_eusb2_hsphy_init(struct phy *p)
	{
	struct qcom_snps_eusb2_hsphy *phy = phy_get_drvdata(p);
	int ret;

	ret = regulator_bulk_enable(ARRAY_SIZE(phy->vregs), phy->vregs);
	if (ret)
	return ret;

	ret = phy_init(phy->repeater);
	if (ret) {
	dev_err(&p->dev, "repeater init failed. %d\n", ret);
	goto disable_vreg;
	}

	ret = clk_prepare_enable(phy->ref_clk);
	if (ret) {
	dev_err(&p->dev, "failed to enable ref clock, %d\n", ret);
	goto disable_vreg;
	}

	ret = reset_control_assert(phy->phy_reset);
	if (ret) {
	dev_err(&p->dev, "failed to assert phy_reset, %d\n", ret);
	goto disable_ref_clk;
	}

	usleep_range(100, 150);

	ret = reset_control_deassert(phy->phy_reset);
	if (ret) {
	dev_err(&p->dev, "failed to de-assert phy_reset, %d\n", ret);
	goto disable_ref_clk;
	}

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG0,
	CMN_CTRL_OVERRIDE_EN, CMN_CTRL_OVERRIDE_EN);

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_UTMI_CTRL5, POR, POR);

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
	PHY_ENABLE \| RETENABLEN, PHY_ENABLE \| RETENABLEN);

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_APB_ACCESS_CMD,
	APB_LOGIC_RESET, APB_LOGIC_RESET);

	qcom_snps_eusb2_hsphy_write_mask(phy->base, UTMI_PHY_CMN_CTRL0, TESTBURNIN, 0);

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_FSEL_SEL,
	FSEL_SEL, FSEL_SEL);

	/* update ref_clk related registers */
	ret = qcom_eusb2_ref_clk_init(phy);
	if (ret)
	goto disable_ref_clk;

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_1,
	PHY_CFG_PLL_CPBIAS_CNTRL_MASK,
	FIELD_PREP(PHY_CFG_PLL_CPBIAS_CNTRL_MASK, 0x1));

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_4,
	PHY_CFG_PLL_INT_CNTRL_MASK,
	FIELD_PREP(PHY_CFG_PLL_INT_CNTRL_MASK, 0x8));

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_4,
	PHY_CFG_PLL_GMP_CNTRL_MASK,
	FIELD_PREP(PHY_CFG_PLL_GMP_CNTRL_MASK, 0x1));

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_5,
	PHY_CFG_PLL_PROP_CNTRL_MASK,
	FIELD_PREP(PHY_CFG_PLL_PROP_CNTRL_MASK, 0x10));

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_6,
	PHY_CFG_PLL_VCO_CNTRL_MASK,
	FIELD_PREP(PHY_CFG_PLL_VCO_CNTRL_MASK, 0x0));

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_5,
	PHY_CFG_PLL_VREF_TUNE_MASK,
	FIELD_PREP(PHY_CFG_PLL_VREF_TUNE_MASK, 0x1));

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL2,
	VBUS_DET_EXT_SEL, VBUS_DET_EXT_SEL);

	/* set default parameters */
	qcom_eusb2_default_parameters(phy);

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL2,
	USB2_SUSPEND_N_SEL \| USB2_SUSPEND_N,
	USB2_SUSPEND_N_SEL \| USB2_SUSPEND_N);

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_UTMI_CTRL0, SLEEPM, SLEEPM);

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
	SIDDQ_SEL, SIDDQ_SEL);

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
	SIDDQ, 0);

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_UTMI_CTRL5, POR, 0);

	qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL2,
	USB2_SUSPEND_N_SEL, 0);

	return 0;

	disable_ref_clk:
	clk_disable_unprepare(phy->ref_clk);

	disable_vreg:
	regulator_bulk_disable(ARRAY_SIZE(phy->vregs), phy->vregs);

	return ret;
	}

	static int qcom_snps_eusb2_hsphy_exit(struct phy *p)
	{
	struct qcom_snps_eusb2_hsphy *phy = phy_get_drvdata(p);

	clk_disable_unprepare(phy->ref_clk);

	regulator_bulk_disable(ARRAY_SIZE(phy->vregs), phy->vregs);

	phy_exit(phy->repeater);

	return 0;
	}

	static const struct phy_ops qcom_snps_eusb2_hsphy_ops = {
	.init = qcom_snps_eusb2_hsphy_init,
	.exit = qcom_snps_eusb2_hsphy_exit,
	.set_mode = qcom_snps_eusb2_hsphy_set_mode,
	.owner = THIS_MODULE,
	};

	static int qcom_snps_eusb2_hsphy_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct qcom_snps_eusb2_hsphy *phy;
	struct phy_provider *phy_provider;
	struct phy *generic_phy;
	int ret, i;
	int num;

	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
	if (!phy)
	return -ENOMEM;

	phy->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(phy->base))
	return PTR_ERR(phy->base);

	phy->phy_reset = devm_reset_control_get_exclusive(dev, NULL);
	if (IS_ERR(phy->phy_reset))
	return PTR_ERR(phy->phy_reset);

	phy->ref_clk = devm_clk_get(dev, "ref");
	if (IS_ERR(phy->ref_clk))
	return dev_err_probe(dev, PTR_ERR(phy->ref_clk),
	"failed to get ref clk\n");

	num = ARRAY_SIZE(phy->vregs);
	for (i = 0; i < num; i++)
	phy->vregs[i].supply = eusb2_hsphy_vreg_names[i];

	ret = devm_regulator_bulk_get(dev, num, phy->vregs);
	if (ret)
	return dev_err_probe(dev, ret,
	"failed to get regulator supplies\n");

	phy->repeater = devm_of_phy_get_by_index(dev, np, 0);
	if (IS_ERR(phy->repeater))
	return dev_err_probe(dev, PTR_ERR(phy->repeater),
	"failed to get repeater\n");

	generic_phy = devm_phy_create(dev, NULL, &qcom_snps_eusb2_hsphy_ops);
	if (IS_ERR(generic_phy)) {
	dev_err(dev, "failed to create phy %d\n", ret);
	return PTR_ERR(generic_phy);
	}

	dev_set_drvdata(dev, phy);
	phy_set_drvdata(generic_phy, phy);

	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
	if (IS_ERR(phy_provider))
	return PTR_ERR(phy_provider);

	dev_info(dev, "Registered Qcom-eUSB2 phy\n");

	return 0;
	}

	static const struct of_device_id qcom_snps_eusb2_hsphy_of_match_table[] = {
	{ .compatible = "qcom,sm8550-snps-eusb2-phy", },
	{ },
	};
	MODULE_DEVICE_TABLE(of, qcom_snps_eusb2_hsphy_of_match_table);

	static struct platform_driver qcom_snps_eusb2_hsphy_driver = {
	.probe = qcom_snps_eusb2_hsphy_probe,
	.driver = {
	.name = "qcom-snps-eusb2-hsphy",
	.of_match_table = qcom_snps_eusb2_hsphy_of_match_table,
	},
	};

	module_platform_driver(qcom_snps_eusb2_hsphy_driver);
	MODULE_DESCRIPTION("Qualcomm SNPS eUSB2 HS PHY driver");
	MODULE_LICENSE("GPL");