1 files changed, 418 insertions, 0 deletions
diff --git a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
new file mode 100644
index 0000000000..0b9a59d5b8
--- /dev/null
+++ b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
@@ -0,0 +1,418 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* Copyright (c) 2017 NXP. */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+
+#define PHY_CTRL0			0x0
+#define PHY_CTRL0_REF_SSP_EN		BIT(2)
+#define PHY_CTRL0_FSEL_MASK		GENMASK(10, 5)
+#define PHY_CTRL0_FSEL_24M		0x2a
+
+#define PHY_CTRL1			0x4
+#define PHY_CTRL1_RESET			BIT(0)
+#define PHY_CTRL1_COMMONONN		BIT(1)
+#define PHY_CTRL1_ATERESET		BIT(3)
+#define PHY_CTRL1_VDATSRCENB0		BIT(19)
+#define PHY_CTRL1_VDATDETENB0		BIT(20)
+
+#define PHY_CTRL2			0x8
+#define PHY_CTRL2_TXENABLEN0		BIT(8)
+#define PHY_CTRL2_OTG_DISABLE		BIT(9)
+
+#define PHY_CTRL3			0xc
+#define PHY_CTRL3_COMPDISTUNE_MASK	GENMASK(2, 0)
+#define PHY_CTRL3_TXPREEMP_TUNE_MASK	GENMASK(16, 15)
+#define PHY_CTRL3_TXRISE_TUNE_MASK	GENMASK(21, 20)
+#define PHY_CTRL3_TXVREF_TUNE_MASK	GENMASK(25, 22)
+#define PHY_CTRL3_TX_VBOOST_LEVEL_MASK	GENMASK(31, 29)
+
+#define PHY_CTRL4			0x10
+#define PHY_CTRL4_PCS_TX_DEEMPH_3P5DB_MASK	GENMASK(20, 15)
+
+#define PHY_CTRL5			0x14
+#define PHY_CTRL5_DMPWD_OVERRIDE_SEL	BIT(23)
+#define PHY_CTRL5_DMPWD_OVERRIDE	BIT(22)
+#define PHY_CTRL5_DPPWD_OVERRIDE_SEL	BIT(21)
+#define PHY_CTRL5_DPPWD_OVERRIDE	BIT(20)
+#define PHY_CTRL5_PCS_TX_SWING_FULL_MASK	GENMASK(6, 0)
+
+#define PHY_CTRL6			0x18
+#define PHY_CTRL6_ALT_CLK_EN		BIT(1)
+#define PHY_CTRL6_ALT_CLK_SEL		BIT(0)
+
+#define PHY_TUNE_DEFAULT		0xffffffff
+
+struct imx8mq_usb_phy {
+	struct phy *phy;
+	struct clk *clk;
+	void __iomem *base;
+	struct regulator *vbus;
+	u32 pcs_tx_swing_full;
+	u32 pcs_tx_deemph_3p5db;
+	u32 tx_vref_tune;
+	u32 tx_rise_tune;
+	u32 tx_preemp_amp_tune;
+	u32 tx_vboost_level;
+	u32 comp_dis_tune;
+};
+
+static u32 phy_tx_vref_tune_from_property(u32 percent)
+{
+	percent = clamp(percent, 94U, 124U);
+
+	return DIV_ROUND_CLOSEST(percent - 94U, 2);
+}
+
+static u32 phy_tx_rise_tune_from_property(u32 percent)
+{
+	switch (percent) {
+	case 0 ... 98:
+		return 3;
+	case 99:
+		return 2;
+	case 100 ... 101:
+		return 1;
+	default:
+		return 0;
+	}
+}
+
+static u32 phy_tx_preemp_amp_tune_from_property(u32 microamp)
+{
+	microamp = min(microamp, 1800U);
+
+	return microamp / 600;
+}
+
+static u32 phy_tx_vboost_level_from_property(u32 microvolt)
+{
+	switch (microvolt) {
+	case 0 ... 960:
+		return 0;
+	case 961 ... 1160:
+		return 2;
+	default:
+		return 3;
+	}
+}
+
+static u32 phy_pcs_tx_deemph_3p5db_from_property(u32 decibel)
+{
+	return min(decibel, 36U);
+}
+
+static u32 phy_comp_dis_tune_from_property(u32 percent)
+{
+	switch (percent) {
+	case 0 ... 92:
+		return 0;
+	case 93 ... 95:
+		return 1;
+	case 96 ... 97:
+		return 2;
+	case 98 ... 102:
+		return 3;
+	case 103 ... 105:
+		return 4;
+	case 106 ... 109:
+		return 5;
+	case 110 ... 113:
+		return 6;
+	default:
+		return 7;
+	}
+}
+static u32 phy_pcs_tx_swing_full_from_property(u32 percent)
+{
+	percent = min(percent, 100U);
+
+	return (percent * 127) / 100;
+}
+
+static void imx8m_get_phy_tuning_data(struct imx8mq_usb_phy *imx_phy)
+{
+	struct device *dev = imx_phy->phy->dev.parent;
+
+	if (device_property_read_u32(dev, "fsl,phy-tx-vref-tune-percent",
+				     &imx_phy->tx_vref_tune))
+		imx_phy->tx_vref_tune = PHY_TUNE_DEFAULT;
+	else
+		imx_phy->tx_vref_tune =
+			phy_tx_vref_tune_from_property(imx_phy->tx_vref_tune);
+
+	if (device_property_read_u32(dev, "fsl,phy-tx-rise-tune-percent",
+				     &imx_phy->tx_rise_tune))
+		imx_phy->tx_rise_tune = PHY_TUNE_DEFAULT;
+	else
+		imx_phy->tx_rise_tune =
+			phy_tx_rise_tune_from_property(imx_phy->tx_rise_tune);
+
+	if (device_property_read_u32(dev, "fsl,phy-tx-preemp-amp-tune-microamp",
+				     &imx_phy->tx_preemp_amp_tune))
+		imx_phy->tx_preemp_amp_tune = PHY_TUNE_DEFAULT;
+	else
+		imx_phy->tx_preemp_amp_tune =
+			phy_tx_preemp_amp_tune_from_property(imx_phy->tx_preemp_amp_tune);
+
+	if (device_property_read_u32(dev, "fsl,phy-tx-vboost-level-microvolt",
+				     &imx_phy->tx_vboost_level))
+		imx_phy->tx_vboost_level = PHY_TUNE_DEFAULT;
+	else
+		imx_phy->tx_vboost_level =
+			phy_tx_vboost_level_from_property(imx_phy->tx_vboost_level);
+
+	if (device_property_read_u32(dev, "fsl,phy-comp-dis-tune-percent",
+				     &imx_phy->comp_dis_tune))
+		imx_phy->comp_dis_tune = PHY_TUNE_DEFAULT;
+	else
+		imx_phy->comp_dis_tune =
+			phy_comp_dis_tune_from_property(imx_phy->comp_dis_tune);
+
+	if (device_property_read_u32(dev, "fsl,pcs-tx-deemph-3p5db-attenuation-db",
+				     &imx_phy->pcs_tx_deemph_3p5db))
+		imx_phy->pcs_tx_deemph_3p5db = PHY_TUNE_DEFAULT;
+	else
+		imx_phy->pcs_tx_deemph_3p5db =
+			phy_pcs_tx_deemph_3p5db_from_property(imx_phy->pcs_tx_deemph_3p5db);
+
+	if (device_property_read_u32(dev, "fsl,phy-pcs-tx-swing-full-percent",
+				     &imx_phy->pcs_tx_swing_full))
+		imx_phy->pcs_tx_swing_full = PHY_TUNE_DEFAULT;
+	else
+		imx_phy->pcs_tx_swing_full =
+			phy_pcs_tx_swing_full_from_property(imx_phy->pcs_tx_swing_full);
+}
+
+static void imx8m_phy_tune(struct imx8mq_usb_phy *imx_phy)
+{
+	u32 value;
+
+	/* PHY tuning */
+	if (imx_phy->pcs_tx_deemph_3p5db != PHY_TUNE_DEFAULT) {
+		value = readl(imx_phy->base + PHY_CTRL4);
+		value &= ~PHY_CTRL4_PCS_TX_DEEMPH_3P5DB_MASK;
+		value |= FIELD_PREP(PHY_CTRL4_PCS_TX_DEEMPH_3P5DB_MASK,
+				   imx_phy->pcs_tx_deemph_3p5db);
+		writel(value, imx_phy->base + PHY_CTRL4);
+	}
+
+	if (imx_phy->pcs_tx_swing_full != PHY_TUNE_DEFAULT) {
+		value = readl(imx_phy->base + PHY_CTRL5);
+		value |= FIELD_PREP(PHY_CTRL5_PCS_TX_SWING_FULL_MASK,
+				   imx_phy->pcs_tx_swing_full);
+		writel(value, imx_phy->base + PHY_CTRL5);
+	}
+
+	if ((imx_phy->tx_vref_tune & imx_phy->tx_rise_tune &
+	     imx_phy->tx_preemp_amp_tune & imx_phy->comp_dis_tune &
+	     imx_phy->tx_vboost_level) == PHY_TUNE_DEFAULT)
+		/* If all are the default values, no need update. */
+		return;
+
+	value = readl(imx_phy->base + PHY_CTRL3);
+
+	if (imx_phy->tx_vref_tune != PHY_TUNE_DEFAULT) {
+		value &= ~PHY_CTRL3_TXVREF_TUNE_MASK;
+		value |= FIELD_PREP(PHY_CTRL3_TXVREF_TUNE_MASK,
+				   imx_phy->tx_vref_tune);
+	}
+
+	if (imx_phy->tx_rise_tune != PHY_TUNE_DEFAULT) {
+		value &= ~PHY_CTRL3_TXRISE_TUNE_MASK;
+		value |= FIELD_PREP(PHY_CTRL3_TXRISE_TUNE_MASK,
+				    imx_phy->tx_rise_tune);
+	}
+
+	if (imx_phy->tx_preemp_amp_tune != PHY_TUNE_DEFAULT) {
+		value &= ~PHY_CTRL3_TXPREEMP_TUNE_MASK;
+		value |= FIELD_PREP(PHY_CTRL3_TXPREEMP_TUNE_MASK,
+				imx_phy->tx_preemp_amp_tune);
+	}
+
+	if (imx_phy->comp_dis_tune != PHY_TUNE_DEFAULT) {
+		value &= ~PHY_CTRL3_COMPDISTUNE_MASK;
+		value |= FIELD_PREP(PHY_CTRL3_COMPDISTUNE_MASK,
+				    imx_phy->comp_dis_tune);
+	}
+
+	if (imx_phy->tx_vboost_level != PHY_TUNE_DEFAULT) {
+		value &= ~PHY_CTRL3_TX_VBOOST_LEVEL_MASK;
+		value |= FIELD_PREP(PHY_CTRL3_TX_VBOOST_LEVEL_MASK,
+				    imx_phy->tx_vboost_level);
+	}
+
+	writel(value, imx_phy->base + PHY_CTRL3);
+}
+
+static int imx8mq_usb_phy_init(struct phy *phy)
+{
+	struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);
+	u32 value;
+
+	value = readl(imx_phy->base + PHY_CTRL1);
+	value &= ~(PHY_CTRL1_VDATSRCENB0 | PHY_CTRL1_VDATDETENB0 |
+		   PHY_CTRL1_COMMONONN);
+	value |= PHY_CTRL1_RESET | PHY_CTRL1_ATERESET;
+	writel(value, imx_phy->base + PHY_CTRL1);
+
+	value = readl(imx_phy->base + PHY_CTRL0);
+	value |= PHY_CTRL0_REF_SSP_EN;
+	writel(value, imx_phy->base + PHY_CTRL0);
+
+	value = readl(imx_phy->base + PHY_CTRL2);
+	value |= PHY_CTRL2_TXENABLEN0;
+	writel(value, imx_phy->base + PHY_CTRL2);
+
+	value = readl(imx_phy->base + PHY_CTRL1);
+	value &= ~(PHY_CTRL1_RESET | PHY_CTRL1_ATERESET);
+	writel(value, imx_phy->base + PHY_CTRL1);
+
+	return 0;
+}
+
+static int imx8mp_usb_phy_init(struct phy *phy)
+{
+	struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);
+	u32 value;
+
+	/* USB3.0 PHY signal fsel for 24M ref */
+	value = readl(imx_phy->base + PHY_CTRL0);
+	value &= ~PHY_CTRL0_FSEL_MASK;
+	value |= FIELD_PREP(PHY_CTRL0_FSEL_MASK, PHY_CTRL0_FSEL_24M);
+	writel(value, imx_phy->base + PHY_CTRL0);
+
+	/* Disable alt_clk_en and use internal MPLL clocks */
+	value = readl(imx_phy->base + PHY_CTRL6);
+	value &= ~(PHY_CTRL6_ALT_CLK_SEL | PHY_CTRL6_ALT_CLK_EN);
+	writel(value, imx_phy->base + PHY_CTRL6);
+
+	value = readl(imx_phy->base + PHY_CTRL1);
+	value &= ~(PHY_CTRL1_VDATSRCENB0 | PHY_CTRL1_VDATDETENB0);
+	value |= PHY_CTRL1_RESET | PHY_CTRL1_ATERESET;
+	writel(value, imx_phy->base + PHY_CTRL1);
+
+	value = readl(imx_phy->base + PHY_CTRL0);
+	value |= PHY_CTRL0_REF_SSP_EN;
+	writel(value, imx_phy->base + PHY_CTRL0);
+
+	value = readl(imx_phy->base + PHY_CTRL2);
+	value |= PHY_CTRL2_TXENABLEN0 | PHY_CTRL2_OTG_DISABLE;
+	writel(value, imx_phy->base + PHY_CTRL2);
+
+	udelay(10);
+
+	value = readl(imx_phy->base + PHY_CTRL1);
+	value &= ~(PHY_CTRL1_RESET | PHY_CTRL1_ATERESET);
+	writel(value, imx_phy->base + PHY_CTRL1);
+
+	imx8m_phy_tune(imx_phy);
+
+	return 0;
+}
+
+static int imx8mq_phy_power_on(struct phy *phy)
+{
+	struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);
+	int ret;
+
+	ret = regulator_enable(imx_phy->vbus);
+	if (ret)
+		return ret;
+
+	return clk_prepare_enable(imx_phy->clk);
+}
+
+static int imx8mq_phy_power_off(struct phy *phy)
+{
+	struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);
+
+	clk_disable_unprepare(imx_phy->clk);
+	regulator_disable(imx_phy->vbus);
+
+	return 0;
+}
+
+static const struct phy_ops imx8mq_usb_phy_ops = {
+	.init		= imx8mq_usb_phy_init,
+	.power_on	= imx8mq_phy_power_on,
+	.power_off	= imx8mq_phy_power_off,
+	.owner		= THIS_MODULE,
+};
+
+static const struct phy_ops imx8mp_usb_phy_ops = {
+	.init		= imx8mp_usb_phy_init,
+	.power_on	= imx8mq_phy_power_on,
+	.power_off	= imx8mq_phy_power_off,
+	.owner		= THIS_MODULE,
+};
+
+static const struct of_device_id imx8mq_usb_phy_of_match[] = {
+	{.compatible = "fsl,imx8mq-usb-phy",
+	 .data = &imx8mq_usb_phy_ops,},
+	{.compatible = "fsl,imx8mp-usb-phy",
+	 .data = &imx8mp_usb_phy_ops,},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, imx8mq_usb_phy_of_match);
+
+static int imx8mq_usb_phy_probe(struct platform_device *pdev)
+{
+	struct phy_provider *phy_provider;
+	struct device *dev = &pdev->dev;
+	struct imx8mq_usb_phy *imx_phy;
+	const struct phy_ops *phy_ops;
+
+	imx_phy = devm_kzalloc(dev, sizeof(*imx_phy), GFP_KERNEL);
+	if (!imx_phy)
+		return -ENOMEM;
+
+	imx_phy->clk = devm_clk_get(dev, "phy");
+	if (IS_ERR(imx_phy->clk)) {
+		dev_err(dev, "failed to get imx8mq usb phy clock\n");
+		return PTR_ERR(imx_phy->clk);
+	}
+
+	imx_phy->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(imx_phy->base))
+		return PTR_ERR(imx_phy->base);
+
+	phy_ops = of_device_get_match_data(dev);
+	if (!phy_ops)
+		return -EINVAL;
+
+	imx_phy->phy = devm_phy_create(dev, NULL, phy_ops);
+	if (IS_ERR(imx_phy->phy))
+		return PTR_ERR(imx_phy->phy);
+
+	imx_phy->vbus = devm_regulator_get(dev, "vbus");
+	if (IS_ERR(imx_phy->vbus))
+		return dev_err_probe(dev, PTR_ERR(imx_phy->vbus), "failed to get vbus\n");
+
+	phy_set_drvdata(imx_phy->phy, imx_phy);
+
+	imx8m_get_phy_tuning_data(imx_phy);
+
+	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+	return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static struct platform_driver imx8mq_usb_phy_driver = {
+	.probe	= imx8mq_usb_phy_probe,
+	.driver = {
+		.name	= "imx8mq-usb-phy",
+		.of_match_table	= imx8mq_usb_phy_of_match,
+	}
+};
+module_platform_driver(imx8mq_usb_phy_driver);
+
+MODULE_DESCRIPTION("FSL IMX8MQ USB PHY driver");
+MODULE_LICENSE("GPL");