drivers/phy/amlogic/phy-meson-gxl-usb2.c - linux-imx - Git at Google

 /*
  * Meson GXL and GXM USB2 PHY driver
  *
  * Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */

 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/regmap.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
 #include <linux/usb/of.h>

 /* bits [31:27] are read-only */
 #define U2P_R0							0x0
 	#define U2P_R0_BYPASS_SEL				BIT(0)
 	#define U2P_R0_BYPASS_DM_EN				BIT(1)
 	#define U2P_R0_BYPASS_DP_EN				BIT(2)
 	#define U2P_R0_TXBITSTUFF_ENH				BIT(3)
 	#define U2P_R0_TXBITSTUFF_EN				BIT(4)
 	#define U2P_R0_DM_PULLDOWN				BIT(5)
 	#define U2P_R0_DP_PULLDOWN				BIT(6)
 	#define U2P_R0_DP_VBUS_VLD_EXT_SEL			BIT(7)
 	#define U2P_R0_DP_VBUS_VLD_EXT				BIT(8)
 	#define U2P_R0_ADP_PRB_EN				BIT(9)
 	#define U2P_R0_ADP_DISCHARGE				BIT(10)
 	#define U2P_R0_ADP_CHARGE				BIT(11)
 	#define U2P_R0_DRV_VBUS					BIT(12)
 	#define U2P_R0_ID_PULLUP				BIT(13)
 	#define U2P_R0_LOOPBACK_EN_B				BIT(14)
 	#define U2P_R0_OTG_DISABLE				BIT(15)
 	#define U2P_R0_COMMON_ONN				BIT(16)
 	#define U2P_R0_FSEL_MASK				GENMASK(19, 17)
 	#define U2P_R0_REF_CLK_SEL_MASK				GENMASK(21, 20)
 	#define U2P_R0_POWER_ON_RESET				BIT(22)
 	#define U2P_R0_V_ATE_TEST_EN_B_MASK			GENMASK(24, 23)
 	#define U2P_R0_ID_SET_ID_DQ				BIT(25)
 	#define U2P_R0_ATE_RESET				BIT(26)
 	#define U2P_R0_FSV_MINUS				BIT(27)
 	#define U2P_R0_FSV_PLUS					BIT(28)
 	#define U2P_R0_BYPASS_DM_DATA				BIT(29)
 	#define U2P_R0_BYPASS_DP_DATA				BIT(30)

 #define U2P_R1							0x4
 	#define U2P_R1_BURN_IN_TEST				BIT(0)
 	#define U2P_R1_ACA_ENABLE				BIT(1)
 	#define U2P_R1_DCD_ENABLE				BIT(2)
 	#define U2P_R1_VDAT_SRC_EN_B				BIT(3)
 	#define U2P_R1_VDAT_DET_EN_B				BIT(4)
 	#define U2P_R1_CHARGES_SEL				BIT(5)
 	#define U2P_R1_TX_PREEMP_PULSE_TUNE			BIT(6)
 	#define U2P_R1_TX_PREEMP_AMP_TUNE_MASK			GENMASK(8, 7)
 	#define U2P_R1_TX_RES_TUNE_MASK				GENMASK(10, 9)
 	#define U2P_R1_TX_RISE_TUNE_MASK			GENMASK(12, 11)
 	#define U2P_R1_TX_VREF_TUNE_MASK			GENMASK(16, 13)
 	#define U2P_R1_TX_FSLS_TUNE_MASK			GENMASK(20, 17)
 	#define U2P_R1_TX_HSXV_TUNE_MASK			GENMASK(22, 21)
 	#define U2P_R1_OTG_TUNE_MASK				GENMASK(25, 23)
 	#define U2P_R1_SQRX_TUNE_MASK				GENMASK(28, 26)
 	#define U2P_R1_COMP_DIS_TUNE_MASK			GENMASK(31, 29)

 /* bits [31:14] are read-only */
 #define U2P_R2							0x8
 	#define U2P_R2_DATA_IN_MASK				GENMASK(3, 0)
 	#define U2P_R2_DATA_IN_EN_MASK				GENMASK(7, 4)
 	#define U2P_R2_ADDR_MASK				GENMASK(11, 8)
 	#define U2P_R2_DATA_OUT_SEL				BIT(12)
 	#define U2P_R2_CLK					BIT(13)
 	#define U2P_R2_DATA_OUT_MASK				GENMASK(17, 14)
 	#define U2P_R2_ACA_PIN_RANGE_C				BIT(18)
 	#define U2P_R2_ACA_PIN_RANGE_B				BIT(19)
 	#define U2P_R2_ACA_PIN_RANGE_A				BIT(20)
 	#define U2P_R2_ACA_PIN_GND				BIT(21)
 	#define U2P_R2_ACA_PIN_FLOAT				BIT(22)
 	#define U2P_R2_CHARGE_DETECT				BIT(23)
 	#define U2P_R2_DEVICE_SESSION_VALID			BIT(24)
 	#define U2P_R2_ADP_PROBE				BIT(25)
 	#define U2P_R2_ADP_SENSE				BIT(26)
 	#define U2P_R2_SESSION_END				BIT(27)
 	#define U2P_R2_VBUS_VALID				BIT(28)
 	#define U2P_R2_B_VALID					BIT(29)
 	#define U2P_R2_A_VALID					BIT(30)
 	#define U2P_R2_ID_DIG					BIT(31)

 #define U2P_R3							0xc

 #define RESET_COMPLETE_TIME				500

 struct phy_meson_gxl_usb2_priv {
 	struct regmap		*regmap;
 	enum phy_mode		mode;
 	int			is_enabled;
 };

 static const struct regmap_config phy_meson_gxl_usb2_regmap_conf = {
 	.reg_bits = 8,
 	.val_bits = 32,
 	.reg_stride = 4,
 	.max_register = U2P_R3,
 };

 static int phy_meson_gxl_usb2_reset(struct phy *phy)
 {
 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);

 	if (priv->is_enabled) {
 		/* reset the PHY and wait until settings are stabilized */
 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET,
 				   U2P_R0_POWER_ON_RESET);
 		udelay(RESET_COMPLETE_TIME);
 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET,
 				   0);
 		udelay(RESET_COMPLETE_TIME);
 	}

 	return 0;
 }

 static int phy_meson_gxl_usb2_set_mode(struct phy *phy, enum phy_mode mode)
 {
 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);

 	switch (mode) {
 	case PHY_MODE_USB_HOST:
 	case PHY_MODE_USB_OTG:
 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DM_PULLDOWN,
 				   U2P_R0_DM_PULLDOWN);
 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DP_PULLDOWN,
 				   U2P_R0_DP_PULLDOWN);
 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_ID_PULLUP, 0);
 		break;

 	case PHY_MODE_USB_DEVICE:
 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DM_PULLDOWN,
 				   0);
 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DP_PULLDOWN,
 				   0);
 		regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_ID_PULLUP,
 				   U2P_R0_ID_PULLUP);
 		break;

 	default:
 		return -EINVAL;
 	}

 	phy_meson_gxl_usb2_reset(phy);

 	priv->mode = mode;

 	return 0;
 }

 static int phy_meson_gxl_usb2_power_off(struct phy *phy)
 {
 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);

 	priv->is_enabled = 0;

 	/* power off the PHY by putting it into reset mode */
 	regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET,
 			   U2P_R0_POWER_ON_RESET);

 	return 0;
 }

 static int phy_meson_gxl_usb2_power_on(struct phy *phy)
 {
 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);
 	int ret;

 	priv->is_enabled = 1;

 	/* power on the PHY by taking it out of reset mode */
 	regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET, 0);

 	ret = phy_meson_gxl_usb2_set_mode(phy, priv->mode);
 	if (ret) {
 		phy_meson_gxl_usb2_power_off(phy);

 		dev_err(&phy->dev, "Failed to initialize PHY with mode %d\n",
 			priv->mode);
 		return ret;
 	}

 	return 0;
 }

 static const struct phy_ops phy_meson_gxl_usb2_ops = {
 	.power_on	= phy_meson_gxl_usb2_power_on,
 	.power_off	= phy_meson_gxl_usb2_power_off,
 	.set_mode	= phy_meson_gxl_usb2_set_mode,
 	.reset		= phy_meson_gxl_usb2_reset,
 	.owner		= THIS_MODULE,
 };

 static int phy_meson_gxl_usb2_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct phy_provider *phy_provider;
 	struct resource *res;
 	struct phy_meson_gxl_usb2_priv *priv;
 	struct phy *phy;
 	void __iomem *base;

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

 	platform_set_drvdata(pdev, priv);

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(base))
 		return PTR_ERR(base);

 	switch (of_usb_get_dr_mode_by_phy(dev->of_node, -1)) {
 	case USB_DR_MODE_PERIPHERAL:
 		priv->mode = PHY_MODE_USB_DEVICE;
 		break;
 	case USB_DR_MODE_OTG:
 		priv->mode = PHY_MODE_USB_OTG;
 		break;
 	case USB_DR_MODE_HOST:
 	default:
 		priv->mode = PHY_MODE_USB_HOST;
 		break;
 	}

 	priv->regmap = devm_regmap_init_mmio(dev, base,
 					     &phy_meson_gxl_usb2_regmap_conf);
 	if (IS_ERR(priv->regmap))
 		return PTR_ERR(priv->regmap);

 	phy = devm_phy_create(dev, NULL, &phy_meson_gxl_usb2_ops);
 	if (IS_ERR(phy)) {
 		dev_err(dev, "failed to create PHY\n");
 		return PTR_ERR(phy);
 	}

 	phy_set_drvdata(phy, priv);

 	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);

 	return PTR_ERR_OR_ZERO(phy_provider);
 }

 static const struct of_device_id phy_meson_gxl_usb2_of_match[] = {
 	{ .compatible = "amlogic,meson-gxl-usb2-phy", },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, phy_meson_gxl_usb2_of_match);

 static struct platform_driver phy_meson_gxl_usb2_driver = {
 	.probe	= phy_meson_gxl_usb2_probe,
 	.driver	= {
 		.name		= "phy-meson-gxl-usb2",
 		.of_match_table	= phy_meson_gxl_usb2_of_match,
 	},
 };
 module_platform_driver(phy_meson_gxl_usb2_driver);

 MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
 MODULE_DESCRIPTION("Meson GXL and GXM USB2 PHY driver");
 MODULE_LICENSE("GPL v2");
	/*
	* Meson GXL and GXM USB2 PHY driver
	*
	* Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*/

	#include <linux/delay.h>
	#include <linux/io.h>
	#include <linux/module.h>
	#include <linux/of_device.h>
	#include <linux/regmap.h>
	#include <linux/phy/phy.h>
	#include <linux/platform_device.h>
	#include <linux/usb/of.h>

	/* bits [31:27] are read-only */
	#define U2P_R0 0x0
	#define U2P_R0_BYPASS_SEL BIT(0)
	#define U2P_R0_BYPASS_DM_EN BIT(1)
	#define U2P_R0_BYPASS_DP_EN BIT(2)
	#define U2P_R0_TXBITSTUFF_ENH BIT(3)
	#define U2P_R0_TXBITSTUFF_EN BIT(4)
	#define U2P_R0_DM_PULLDOWN BIT(5)
	#define U2P_R0_DP_PULLDOWN BIT(6)
	#define U2P_R0_DP_VBUS_VLD_EXT_SEL BIT(7)
	#define U2P_R0_DP_VBUS_VLD_EXT BIT(8)
	#define U2P_R0_ADP_PRB_EN BIT(9)
	#define U2P_R0_ADP_DISCHARGE BIT(10)
	#define U2P_R0_ADP_CHARGE BIT(11)
	#define U2P_R0_DRV_VBUS BIT(12)
	#define U2P_R0_ID_PULLUP BIT(13)
	#define U2P_R0_LOOPBACK_EN_B BIT(14)
	#define U2P_R0_OTG_DISABLE BIT(15)
	#define U2P_R0_COMMON_ONN BIT(16)
	#define U2P_R0_FSEL_MASK GENMASK(19, 17)
	#define U2P_R0_REF_CLK_SEL_MASK GENMASK(21, 20)
	#define U2P_R0_POWER_ON_RESET BIT(22)
	#define U2P_R0_V_ATE_TEST_EN_B_MASK GENMASK(24, 23)
	#define U2P_R0_ID_SET_ID_DQ BIT(25)
	#define U2P_R0_ATE_RESET BIT(26)
	#define U2P_R0_FSV_MINUS BIT(27)
	#define U2P_R0_FSV_PLUS BIT(28)
	#define U2P_R0_BYPASS_DM_DATA BIT(29)
	#define U2P_R0_BYPASS_DP_DATA BIT(30)

	#define U2P_R1 0x4
	#define U2P_R1_BURN_IN_TEST BIT(0)
	#define U2P_R1_ACA_ENABLE BIT(1)
	#define U2P_R1_DCD_ENABLE BIT(2)
	#define U2P_R1_VDAT_SRC_EN_B BIT(3)
	#define U2P_R1_VDAT_DET_EN_B BIT(4)
	#define U2P_R1_CHARGES_SEL BIT(5)
	#define U2P_R1_TX_PREEMP_PULSE_TUNE BIT(6)
	#define U2P_R1_TX_PREEMP_AMP_TUNE_MASK GENMASK(8, 7)
	#define U2P_R1_TX_RES_TUNE_MASK GENMASK(10, 9)
	#define U2P_R1_TX_RISE_TUNE_MASK GENMASK(12, 11)
	#define U2P_R1_TX_VREF_TUNE_MASK GENMASK(16, 13)
	#define U2P_R1_TX_FSLS_TUNE_MASK GENMASK(20, 17)
	#define U2P_R1_TX_HSXV_TUNE_MASK GENMASK(22, 21)
	#define U2P_R1_OTG_TUNE_MASK GENMASK(25, 23)
	#define U2P_R1_SQRX_TUNE_MASK GENMASK(28, 26)
	#define U2P_R1_COMP_DIS_TUNE_MASK GENMASK(31, 29)

	/* bits [31:14] are read-only */
	#define U2P_R2 0x8
	#define U2P_R2_DATA_IN_MASK GENMASK(3, 0)
	#define U2P_R2_DATA_IN_EN_MASK GENMASK(7, 4)
	#define U2P_R2_ADDR_MASK GENMASK(11, 8)
	#define U2P_R2_DATA_OUT_SEL BIT(12)
	#define U2P_R2_CLK BIT(13)
	#define U2P_R2_DATA_OUT_MASK GENMASK(17, 14)
	#define U2P_R2_ACA_PIN_RANGE_C BIT(18)
	#define U2P_R2_ACA_PIN_RANGE_B BIT(19)
	#define U2P_R2_ACA_PIN_RANGE_A BIT(20)
	#define U2P_R2_ACA_PIN_GND BIT(21)
	#define U2P_R2_ACA_PIN_FLOAT BIT(22)
	#define U2P_R2_CHARGE_DETECT BIT(23)
	#define U2P_R2_DEVICE_SESSION_VALID BIT(24)
	#define U2P_R2_ADP_PROBE BIT(25)
	#define U2P_R2_ADP_SENSE BIT(26)
	#define U2P_R2_SESSION_END BIT(27)
	#define U2P_R2_VBUS_VALID BIT(28)
	#define U2P_R2_B_VALID BIT(29)
	#define U2P_R2_A_VALID BIT(30)
	#define U2P_R2_ID_DIG BIT(31)

	#define U2P_R3 0xc

	#define RESET_COMPLETE_TIME 500

	struct phy_meson_gxl_usb2_priv {
	struct regmap *regmap;
	enum phy_mode mode;
	int is_enabled;
	};

	static const struct regmap_config phy_meson_gxl_usb2_regmap_conf = {
	.reg_bits = 8,
	.val_bits = 32,
	.reg_stride = 4,
	.max_register = U2P_R3,
	};

	static int phy_meson_gxl_usb2_reset(struct phy *phy)
	{
	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);

	if (priv->is_enabled) {
	/* reset the PHY and wait until settings are stabilized */
	regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET,
	U2P_R0_POWER_ON_RESET);
	udelay(RESET_COMPLETE_TIME);
	regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET,
	0);
	udelay(RESET_COMPLETE_TIME);
	}

	return 0;
	}

	static int phy_meson_gxl_usb2_set_mode(struct phy *phy, enum phy_mode mode)
	{
	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);

	switch (mode) {
	case PHY_MODE_USB_HOST:
	case PHY_MODE_USB_OTG:
	regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DM_PULLDOWN,
	U2P_R0_DM_PULLDOWN);
	regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DP_PULLDOWN,
	U2P_R0_DP_PULLDOWN);
	regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_ID_PULLUP, 0);
	break;

	case PHY_MODE_USB_DEVICE:
	regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DM_PULLDOWN,
	0);
	regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DP_PULLDOWN,
	0);
	regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_ID_PULLUP,
	U2P_R0_ID_PULLUP);
	break;

	default:
	return -EINVAL;
	}

	phy_meson_gxl_usb2_reset(phy);

	priv->mode = mode;

	return 0;
	}

	static int phy_meson_gxl_usb2_power_off(struct phy *phy)
	{
	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);

	priv->is_enabled = 0;

	/* power off the PHY by putting it into reset mode */
	regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET,
	U2P_R0_POWER_ON_RESET);

	return 0;
	}

	static int phy_meson_gxl_usb2_power_on(struct phy *phy)
	{
	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);
	int ret;

	priv->is_enabled = 1;

	/* power on the PHY by taking it out of reset mode */
	regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET, 0);

	ret = phy_meson_gxl_usb2_set_mode(phy, priv->mode);
	if (ret) {
	phy_meson_gxl_usb2_power_off(phy);

	dev_err(&phy->dev, "Failed to initialize PHY with mode %d\n",
	priv->mode);
	return ret;
	}

	return 0;
	}

	static const struct phy_ops phy_meson_gxl_usb2_ops = {
	.power_on = phy_meson_gxl_usb2_power_on,
	.power_off = phy_meson_gxl_usb2_power_off,
	.set_mode = phy_meson_gxl_usb2_set_mode,
	.reset = phy_meson_gxl_usb2_reset,
	.owner = THIS_MODULE,
	};

	static int phy_meson_gxl_usb2_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct phy_provider *phy_provider;
	struct resource *res;
	struct phy_meson_gxl_usb2_priv *priv;
	struct phy *phy;
	void __iomem *base;

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

	platform_set_drvdata(pdev, priv);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	base = devm_ioremap_resource(dev, res);
	if (IS_ERR(base))
	return PTR_ERR(base);

	switch (of_usb_get_dr_mode_by_phy(dev->of_node, -1)) {
	case USB_DR_MODE_PERIPHERAL:
	priv->mode = PHY_MODE_USB_DEVICE;
	break;
	case USB_DR_MODE_OTG:
	priv->mode = PHY_MODE_USB_OTG;
	break;
	case USB_DR_MODE_HOST:
	default:
	priv->mode = PHY_MODE_USB_HOST;
	break;
	}

	priv->regmap = devm_regmap_init_mmio(dev, base,
	&phy_meson_gxl_usb2_regmap_conf);
	if (IS_ERR(priv->regmap))
	return PTR_ERR(priv->regmap);

	phy = devm_phy_create(dev, NULL, &phy_meson_gxl_usb2_ops);
	if (IS_ERR(phy)) {
	dev_err(dev, "failed to create PHY\n");
	return PTR_ERR(phy);
	}

	phy_set_drvdata(phy, priv);

	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);

	return PTR_ERR_OR_ZERO(phy_provider);
	}

	static const struct of_device_id phy_meson_gxl_usb2_of_match[] = {
	{ .compatible = "amlogic,meson-gxl-usb2-phy", },
	{ },
	};
	MODULE_DEVICE_TABLE(of, phy_meson_gxl_usb2_of_match);

	static struct platform_driver phy_meson_gxl_usb2_driver = {
	.probe = phy_meson_gxl_usb2_probe,
	.driver = {
	.name = "phy-meson-gxl-usb2",
	.of_match_table = phy_meson_gxl_usb2_of_match,
	},
	};
	module_platform_driver(phy_meson_gxl_usb2_driver);

	MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
	MODULE_DESCRIPTION("Meson GXL and GXM USB2 PHY driver");
	MODULE_LICENSE("GPL v2");