drivers/usb/dwc3/dwc3-meson-g12a.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Amlogic G12A DWC3 Glue layer
  *
  * Copyright (C) 2019 BayLibre, SAS
  * Author: Neil Armstrong <narmstrong@baylibre.com>
  */

 #include <common.h>
 #include <log.h>
 #include <asm-generic/io.h>
 #include <dm.h>
 #include <dm/device-internal.h>
 #include <dm/lists.h>
 #include <dwc3-uboot.h>
 #include <generic-phy.h>
 #include <linux/delay.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 #include <malloc.h>
 #include <regmap.h>
 #include <usb.h>
 #include "core.h"
 #include "gadget.h"
 #include <reset.h>
 #include <clk.h>
 #include <power/regulator.h>
 #include <linux/bitfield.h>
 #include <linux/bitops.h>
 #include <linux/compat.h>

 /* USB2 Ports Control Registers */

 #define U2P_REG_SIZE						0x20

 #define U2P_R0							0x0
 	#define U2P_R0_HOST_DEVICE				BIT(0)
 	#define U2P_R0_POWER_OK					BIT(1)
 	#define U2P_R0_HAST_MODE				BIT(2)
 	#define U2P_R0_POWER_ON_RESET				BIT(3)
 	#define U2P_R0_ID_PULLUP				BIT(4)
 	#define U2P_R0_DRV_VBUS					BIT(5)

 #define U2P_R1							0x4
 	#define U2P_R1_PHY_READY				BIT(0)
 	#define U2P_R1_ID_DIG					BIT(1)
 	#define U2P_R1_OTG_SESSION_VALID			BIT(2)
 	#define U2P_R1_VBUS_VALID				BIT(3)

 /* USB Glue Control Registers */

 #define USB_R0							0x80
 	#define USB_R0_P30_LANE0_TX2RX_LOOPBACK			BIT(17)
 	#define USB_R0_P30_LANE0_EXT_PCLK_REQ			BIT(18)
 	#define USB_R0_P30_PCS_RX_LOS_MASK_VAL_MASK		GENMASK(28, 19)
 	#define USB_R0_U2D_SS_SCALEDOWN_MODE_MASK		GENMASK(30, 29)
 	#define USB_R0_U2D_ACT					BIT(31)

 #define USB_R1							0x84
 	#define USB_R1_U3H_BIGENDIAN_GS				BIT(0)
 	#define USB_R1_U3H_PME_ENABLE				BIT(1)
 	#define USB_R1_U3H_HUB_PORT_OVERCURRENT_MASK		GENMASK(4, 2)
 	#define USB_R1_U3H_HUB_PORT_PERM_ATTACH_MASK		GENMASK(9, 7)
 	#define USB_R1_U3H_HOST_U2_PORT_DISABLE_MASK		GENMASK(13, 12)
 	#define USB_R1_U3H_HOST_U3_PORT_DISABLE			BIT(16)
 	#define USB_R1_U3H_HOST_PORT_POWER_CONTROL_PRESENT	BIT(17)
 	#define USB_R1_U3H_HOST_MSI_ENABLE			BIT(18)
 	#define USB_R1_U3H_FLADJ_30MHZ_REG_MASK			GENMASK(24, 19)
 	#define USB_R1_P30_PCS_TX_SWING_FULL_MASK		GENMASK(31, 25)

 #define USB_R2							0x88
 	#define USB_R2_P30_PCS_TX_DEEMPH_3P5DB_MASK		GENMASK(25, 20)
 	#define USB_R2_P30_PCS_TX_DEEMPH_6DB_MASK		GENMASK(31, 26)

 #define USB_R3							0x8c
 	#define USB_R3_P30_SSC_ENABLE				BIT(0)
 	#define USB_R3_P30_SSC_RANGE_MASK			GENMASK(3, 1)
 	#define USB_R3_P30_SSC_REF_CLK_SEL_MASK			GENMASK(12, 4)
 	#define USB_R3_P30_REF_SSP_EN				BIT(13)

 #define USB_R4							0x90
 	#define USB_R4_P21_PORT_RESET_0				BIT(0)
 	#define USB_R4_P21_SLEEP_M0				BIT(1)
 	#define USB_R4_MEM_PD_MASK				GENMASK(3, 2)
 	#define USB_R4_P21_ONLY					BIT(4)

 #define USB_R5							0x94
 	#define USB_R5_ID_DIG_SYNC				BIT(0)
 	#define USB_R5_ID_DIG_REG				BIT(1)
 	#define USB_R5_ID_DIG_CFG_MASK				GENMASK(3, 2)
 	#define USB_R5_ID_DIG_EN_0				BIT(4)
 	#define USB_R5_ID_DIG_EN_1				BIT(5)
 	#define USB_R5_ID_DIG_CURR				BIT(6)
 	#define USB_R5_ID_DIG_IRQ				BIT(7)
 	#define USB_R5_ID_DIG_TH_MASK				GENMASK(15, 8)
 	#define USB_R5_ID_DIG_CNT_MASK				GENMASK(23, 16)

 enum {
 	USB2_HOST_PHY = 0,
 	USB2_OTG_PHY,
 	USB3_HOST_PHY,
 	PHY_COUNT,
 };

 static const char *phy_names[PHY_COUNT] = {
 	"usb2-phy0", "usb2-phy1", "usb3-phy0",
 };

 struct dwc3_meson_g12a {
 	struct udevice		*dev;
 	struct regmap           *regmap;
 	struct clk		clk;
 	struct reset_ctl	reset;
 	struct phy		phys[PHY_COUNT];
 	enum usb_dr_mode	otg_mode;
 	enum usb_dr_mode	otg_phy_mode;
 	unsigned int		usb2_ports;
 	unsigned int		usb3_ports;
 #if CONFIG_IS_ENABLED(DM_REGULATOR)
 	struct udevice		*vbus_supply;
 #endif
 };

 #define U2P_REG_SIZE						0x20
 #define USB_REG_OFFSET						0x80

 static void dwc3_meson_g12a_usb2_set_mode(struct dwc3_meson_g12a *priv,
 					  int i, enum usb_dr_mode mode)
 {
 	switch (mode) {
 	case USB_DR_MODE_HOST:
 	case USB_DR_MODE_OTG:
 	case USB_DR_MODE_UNKNOWN:
 		regmap_update_bits(priv->regmap, U2P_R0 + (U2P_REG_SIZE * i),
 				U2P_R0_HOST_DEVICE,
 				U2P_R0_HOST_DEVICE);
 		break;

 	case USB_DR_MODE_PERIPHERAL:
 		regmap_update_bits(priv->regmap, U2P_R0 + (U2P_REG_SIZE * i),
 				U2P_R0_HOST_DEVICE, 0);
 		break;
 	}
 }

 static int dwc3_meson_g12a_usb2_init(struct dwc3_meson_g12a *priv)
 {
 	int i;

 	if (priv->otg_mode == USB_DR_MODE_PERIPHERAL)
 		priv->otg_phy_mode = USB_DR_MODE_PERIPHERAL;
 	else
 		priv->otg_phy_mode = USB_DR_MODE_HOST;

 	for (i = 0 ; i < USB3_HOST_PHY ; ++i) {
 		if (!priv->phys[i].dev)
 			continue;

 		regmap_update_bits(priv->regmap, U2P_R0 + (U2P_REG_SIZE * i),
 				   U2P_R0_POWER_ON_RESET,
 				   U2P_R0_POWER_ON_RESET);

 		if (i == USB2_OTG_PHY) {
 			regmap_update_bits(priv->regmap,
 					   U2P_R0 + (U2P_REG_SIZE * i),
 					   U2P_R0_ID_PULLUP | U2P_R0_DRV_VBUS,
 					   U2P_R0_ID_PULLUP | U2P_R0_DRV_VBUS);

 			dwc3_meson_g12a_usb2_set_mode(priv, i,
 						      priv->otg_phy_mode);
 		} else
 			dwc3_meson_g12a_usb2_set_mode(priv, i,
 						      USB_DR_MODE_HOST);

 		regmap_update_bits(priv->regmap, U2P_R0 + (U2P_REG_SIZE * i),
 				   U2P_R0_POWER_ON_RESET, 0);
 	}

 	return 0;
 }

 static void dwc3_meson_g12a_usb3_init(struct dwc3_meson_g12a *priv)
 {
 	regmap_update_bits(priv->regmap, USB_R3,
 			USB_R3_P30_SSC_RANGE_MASK |
 			USB_R3_P30_REF_SSP_EN,
 			USB_R3_P30_SSC_ENABLE |
 			FIELD_PREP(USB_R3_P30_SSC_RANGE_MASK, 2) |
 			USB_R3_P30_REF_SSP_EN);
 	udelay(2);

 	regmap_update_bits(priv->regmap, USB_R2,
 			USB_R2_P30_PCS_TX_DEEMPH_3P5DB_MASK,
 			FIELD_PREP(USB_R2_P30_PCS_TX_DEEMPH_3P5DB_MASK, 0x15));

 	regmap_update_bits(priv->regmap, USB_R2,
 			USB_R2_P30_PCS_TX_DEEMPH_6DB_MASK,
 			FIELD_PREP(USB_R2_P30_PCS_TX_DEEMPH_6DB_MASK, 0x20));

 	udelay(2);

 	regmap_update_bits(priv->regmap, USB_R1,
 			USB_R1_U3H_HOST_PORT_POWER_CONTROL_PRESENT,
 			USB_R1_U3H_HOST_PORT_POWER_CONTROL_PRESENT);

 	regmap_update_bits(priv->regmap, USB_R1,
 			USB_R1_P30_PCS_TX_SWING_FULL_MASK,
 			FIELD_PREP(USB_R1_P30_PCS_TX_SWING_FULL_MASK, 127));
 }

 static void dwc3_meson_g12a_usb_init_mode(struct dwc3_meson_g12a *priv)
 {
 	if (priv->otg_phy_mode == USB_DR_MODE_PERIPHERAL) {
 		regmap_update_bits(priv->regmap, USB_R0,
 				USB_R0_U2D_ACT, USB_R0_U2D_ACT);
 		regmap_update_bits(priv->regmap, USB_R0,
 				USB_R0_U2D_SS_SCALEDOWN_MODE_MASK, 0);
 		regmap_update_bits(priv->regmap, USB_R4,
 				USB_R4_P21_SLEEP_M0, USB_R4_P21_SLEEP_M0);
 	} else {
 		regmap_update_bits(priv->regmap, USB_R0,
 				USB_R0_U2D_ACT, 0);
 		regmap_update_bits(priv->regmap, USB_R4,
 				USB_R4_P21_SLEEP_M0, 0);
 	}
 }

 static int dwc3_meson_g12a_usb_init(struct dwc3_meson_g12a *priv)
 {
 	int ret;

 	ret = dwc3_meson_g12a_usb2_init(priv);
 	if (ret)
 		return ret;

 	regmap_update_bits(priv->regmap, USB_R1,
 			USB_R1_U3H_FLADJ_30MHZ_REG_MASK,
 			FIELD_PREP(USB_R1_U3H_FLADJ_30MHZ_REG_MASK, 0x20));

 	regmap_update_bits(priv->regmap, USB_R5,
 			USB_R5_ID_DIG_EN_0,
 			USB_R5_ID_DIG_EN_0);
 	regmap_update_bits(priv->regmap, USB_R5,
 			USB_R5_ID_DIG_EN_1,
 			USB_R5_ID_DIG_EN_1);
 	regmap_update_bits(priv->regmap, USB_R5,
 			USB_R5_ID_DIG_TH_MASK,
 			FIELD_PREP(USB_R5_ID_DIG_TH_MASK, 0xff));

 	/* If we have an actual SuperSpeed port, initialize it */
 	if (priv->usb3_ports)
 		dwc3_meson_g12a_usb3_init(priv);

 	dwc3_meson_g12a_usb_init_mode(priv);

 	return 0;
 }

 int dwc3_meson_g12a_force_mode(struct udevice *dev, enum usb_dr_mode mode)
 {
 	struct dwc3_meson_g12a *priv = dev_get_platdata(dev);

 	if (!priv)
 		return -EINVAL;

 	if (mode != USB_DR_MODE_HOST && mode != USB_DR_MODE_PERIPHERAL)
 		return -EINVAL;

 	if (!priv->phys[USB2_OTG_PHY].dev)
 		return -EINVAL;

 	if (mode == USB_DR_MODE_HOST)
 		debug("%s: switching to Host Mode\n", __func__);
 	else
 		debug("%s: switching to Device Mode\n", __func__);

 #if CONFIG_IS_ENABLED(DM_REGULATOR)
 	if (priv->vbus_supply) {
 		int ret = regulator_set_enable(priv->vbus_supply,
 					(mode == USB_DR_MODE_PERIPHERAL));
 		if (ret)
 			return ret;
 	}
 #endif
 	priv->otg_phy_mode = mode;

 	dwc3_meson_g12a_usb2_set_mode(priv, USB2_OTG_PHY, mode);

 	dwc3_meson_g12a_usb_init_mode(priv);

 	return 0;
 }

 static int dwc3_meson_g12a_get_phys(struct dwc3_meson_g12a *priv)
 {
 	int i, ret;

 	for (i = 0 ; i < PHY_COUNT ; ++i) {
 		ret = generic_phy_get_by_name(priv->dev, phy_names[i],
 					      &priv->phys[i]);
 		if (ret == -ENOENT)
 			continue;

 		if (ret)
 			return ret;

 		if (i == USB3_HOST_PHY)
 			priv->usb3_ports++;
 		else
 			priv->usb2_ports++;
 	}

 	debug("%s: usb2 ports: %d\n", __func__, priv->usb2_ports);
 	debug("%s: usb3 ports: %d\n", __func__, priv->usb3_ports);

 	return 0;
 }

 static int dwc3_meson_g12a_reset_init(struct dwc3_meson_g12a *priv)
 {
 	int ret;

 	ret = reset_get_by_index(priv->dev, 0, &priv->reset);
 	if (ret)
 		return ret;

 	ret = reset_assert(&priv->reset);
 	udelay(1);
 	ret |= reset_deassert(&priv->reset);
 	if (ret) {
 		reset_free(&priv->reset);
 		return ret;
 	}

 	return 0;
 }

 static int dwc3_meson_g12a_clk_init(struct dwc3_meson_g12a *priv)
 {
 	int ret;

 	ret = clk_get_by_index(priv->dev, 0, &priv->clk);
 	if (ret)
 		return ret;

 #if CONFIG_IS_ENABLED(CLK)
 	ret = clk_enable(&priv->clk);
 	if (ret) {
 		clk_free(&priv->clk);
 		return ret;
 	}
 #endif

 	return 0;
 }

 static int dwc3_meson_g12a_probe(struct udevice *dev)
 {
 	struct dwc3_meson_g12a *priv = dev_get_platdata(dev);
 	int ret, i;

 	priv->dev = dev;

 	ret = regmap_init_mem(dev_ofnode(dev), &priv->regmap);
 	if (ret)
 		return ret;

 	ret = dwc3_meson_g12a_clk_init(priv);
 	if (ret)
 		return ret;

 	ret = dwc3_meson_g12a_reset_init(priv);
 	if (ret)
 		return ret;

 	ret = dwc3_meson_g12a_get_phys(priv);
 	if (ret)
 		return ret;

 #if CONFIG_IS_ENABLED(DM_REGULATOR)
 	ret = device_get_supply_regulator(dev, "vbus-supply",
 					  &priv->vbus_supply);
 	if (ret && ret != -ENOENT) {
 		pr_err("Failed to get PHY regulator\n");
 		return ret;
 	}

 	if (priv->vbus_supply) {
 		ret = regulator_set_enable(priv->vbus_supply, true);
 		if (ret)
 			return ret;
 	}
 #endif

 	priv->otg_mode = usb_get_dr_mode(dev->node);

 	ret = dwc3_meson_g12a_usb_init(priv);
 	if (ret)
 		return ret;

 	for (i = 0 ; i < PHY_COUNT ; ++i) {
 		if (!priv->phys[i].dev)
 			continue;

 		ret = generic_phy_init(&priv->phys[i]);
 		if (ret)
 			goto err_phy_init;
 	}

 	for (i = 0; i < PHY_COUNT; ++i) {
 		if (!priv->phys[i].dev)
 			continue;

 		ret = generic_phy_power_on(&priv->phys[i]);
 		if (ret)
 			goto err_phy_init;
 	}

 	return 0;

 err_phy_init:
 	for (i = 0 ; i < PHY_COUNT ; ++i) {
 		if (!priv->phys[i].dev)
 			continue;

 		 generic_phy_exit(&priv->phys[i]);
 	}

 	return ret;
 }

 static int dwc3_meson_g12a_remove(struct udevice *dev)
 {
 	struct dwc3_meson_g12a *priv = dev_get_platdata(dev);
 	int i;

 	reset_release_all(&priv->reset, 1);

 	clk_release_all(&priv->clk, 1);

 	for (i = 0; i < PHY_COUNT; ++i) {
 		if (!priv->phys[i].dev)
 			continue;

 		 generic_phy_power_off(&priv->phys[i]);
 	}

 	for (i = 0 ; i < PHY_COUNT ; ++i) {
 		if (!priv->phys[i].dev)
 			continue;

 		 generic_phy_exit(&priv->phys[i]);
 	}

 	return dm_scan_fdt_dev(dev);
 }

 static const struct udevice_id dwc3_meson_g12a_ids[] = {
 	{ .compatible = "amlogic,meson-g12a-usb-ctrl" },
 	{ }
 };

 U_BOOT_DRIVER(dwc3_generic_wrapper) = {
 	.name	= "dwc3-meson-g12a",
 	.id	= UCLASS_SIMPLE_BUS,
 	.of_match = dwc3_meson_g12a_ids,
 	.probe = dwc3_meson_g12a_probe,
 	.remove = dwc3_meson_g12a_remove,
 	.platdata_auto_alloc_size = sizeof(struct dwc3_meson_g12a),

 };
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Amlogic G12A DWC3 Glue layer
	*
	* Copyright (C) 2019 BayLibre, SAS
	* Author: Neil Armstrong <narmstrong@baylibre.com>
	*/

	#include <common.h>
	#include <log.h>
	#include <asm-generic/io.h>
	#include <dm.h>
	#include <dm/device-internal.h>
	#include <dm/lists.h>
	#include <dwc3-uboot.h>
	#include <generic-phy.h>
	#include <linux/delay.h>
	#include <linux/usb/ch9.h>
	#include <linux/usb/gadget.h>
	#include <malloc.h>
	#include <regmap.h>
	#include <usb.h>
	#include "core.h"
	#include "gadget.h"
	#include <reset.h>
	#include <clk.h>
	#include <power/regulator.h>
	#include <linux/bitfield.h>
	#include <linux/bitops.h>
	#include <linux/compat.h>

	/* USB2 Ports Control Registers */

	#define U2P_REG_SIZE 0x20

	#define U2P_R0 0x0
	#define U2P_R0_HOST_DEVICE BIT(0)
	#define U2P_R0_POWER_OK BIT(1)
	#define U2P_R0_HAST_MODE BIT(2)
	#define U2P_R0_POWER_ON_RESET BIT(3)
	#define U2P_R0_ID_PULLUP BIT(4)
	#define U2P_R0_DRV_VBUS BIT(5)

	#define U2P_R1 0x4
	#define U2P_R1_PHY_READY BIT(0)
	#define U2P_R1_ID_DIG BIT(1)
	#define U2P_R1_OTG_SESSION_VALID BIT(2)
	#define U2P_R1_VBUS_VALID BIT(3)

	/* USB Glue Control Registers */

	#define USB_R0 0x80
	#define USB_R0_P30_LANE0_TX2RX_LOOPBACK BIT(17)
	#define USB_R0_P30_LANE0_EXT_PCLK_REQ BIT(18)
	#define USB_R0_P30_PCS_RX_LOS_MASK_VAL_MASK GENMASK(28, 19)
	#define USB_R0_U2D_SS_SCALEDOWN_MODE_MASK GENMASK(30, 29)
	#define USB_R0_U2D_ACT BIT(31)

	#define USB_R1 0x84
	#define USB_R1_U3H_BIGENDIAN_GS BIT(0)
	#define USB_R1_U3H_PME_ENABLE BIT(1)
	#define USB_R1_U3H_HUB_PORT_OVERCURRENT_MASK GENMASK(4, 2)
	#define USB_R1_U3H_HUB_PORT_PERM_ATTACH_MASK GENMASK(9, 7)
	#define USB_R1_U3H_HOST_U2_PORT_DISABLE_MASK GENMASK(13, 12)
	#define USB_R1_U3H_HOST_U3_PORT_DISABLE BIT(16)
	#define USB_R1_U3H_HOST_PORT_POWER_CONTROL_PRESENT BIT(17)
	#define USB_R1_U3H_HOST_MSI_ENABLE BIT(18)
	#define USB_R1_U3H_FLADJ_30MHZ_REG_MASK GENMASK(24, 19)
	#define USB_R1_P30_PCS_TX_SWING_FULL_MASK GENMASK(31, 25)

	#define USB_R2 0x88
	#define USB_R2_P30_PCS_TX_DEEMPH_3P5DB_MASK GENMASK(25, 20)
	#define USB_R2_P30_PCS_TX_DEEMPH_6DB_MASK GENMASK(31, 26)

	#define USB_R3 0x8c
	#define USB_R3_P30_SSC_ENABLE BIT(0)
	#define USB_R3_P30_SSC_RANGE_MASK GENMASK(3, 1)
	#define USB_R3_P30_SSC_REF_CLK_SEL_MASK GENMASK(12, 4)
	#define USB_R3_P30_REF_SSP_EN BIT(13)

	#define USB_R4 0x90
	#define USB_R4_P21_PORT_RESET_0 BIT(0)
	#define USB_R4_P21_SLEEP_M0 BIT(1)
	#define USB_R4_MEM_PD_MASK GENMASK(3, 2)
	#define USB_R4_P21_ONLY BIT(4)

	#define USB_R5 0x94
	#define USB_R5_ID_DIG_SYNC BIT(0)
	#define USB_R5_ID_DIG_REG BIT(1)
	#define USB_R5_ID_DIG_CFG_MASK GENMASK(3, 2)
	#define USB_R5_ID_DIG_EN_0 BIT(4)
	#define USB_R5_ID_DIG_EN_1 BIT(5)
	#define USB_R5_ID_DIG_CURR BIT(6)
	#define USB_R5_ID_DIG_IRQ BIT(7)
	#define USB_R5_ID_DIG_TH_MASK GENMASK(15, 8)
	#define USB_R5_ID_DIG_CNT_MASK GENMASK(23, 16)

	enum {
	USB2_HOST_PHY = 0,
	USB2_OTG_PHY,
	USB3_HOST_PHY,
	PHY_COUNT,
	};

	static const char *phy_names[PHY_COUNT] = {
	"usb2-phy0", "usb2-phy1", "usb3-phy0",
	};

	struct dwc3_meson_g12a {
	struct udevice *dev;
	struct regmap *regmap;
	struct clk clk;
	struct reset_ctl reset;
	struct phy phys[PHY_COUNT];
	enum usb_dr_mode otg_mode;
	enum usb_dr_mode otg_phy_mode;
	unsigned int usb2_ports;
	unsigned int usb3_ports;
	#if CONFIG_IS_ENABLED(DM_REGULATOR)
	struct udevice *vbus_supply;
	#endif
	};

	#define U2P_REG_SIZE 0x20
	#define USB_REG_OFFSET 0x80

	static void dwc3_meson_g12a_usb2_set_mode(struct dwc3_meson_g12a *priv,
	int i, enum usb_dr_mode mode)
	{
	switch (mode) {
	case USB_DR_MODE_HOST:
	case USB_DR_MODE_OTG:
	case USB_DR_MODE_UNKNOWN:
	regmap_update_bits(priv->regmap, U2P_R0 + (U2P_REG_SIZE * i),
	U2P_R0_HOST_DEVICE,
	U2P_R0_HOST_DEVICE);
	break;

	case USB_DR_MODE_PERIPHERAL:
	regmap_update_bits(priv->regmap, U2P_R0 + (U2P_REG_SIZE * i),
	U2P_R0_HOST_DEVICE, 0);
	break;
	}
	}

	static int dwc3_meson_g12a_usb2_init(struct dwc3_meson_g12a *priv)
	{
	int i;

	if (priv->otg_mode == USB_DR_MODE_PERIPHERAL)
	priv->otg_phy_mode = USB_DR_MODE_PERIPHERAL;
	else
	priv->otg_phy_mode = USB_DR_MODE_HOST;

	for (i = 0 ; i < USB3_HOST_PHY ; ++i) {
	if (!priv->phys[i].dev)
	continue;

	regmap_update_bits(priv->regmap, U2P_R0 + (U2P_REG_SIZE * i),
	U2P_R0_POWER_ON_RESET,
	U2P_R0_POWER_ON_RESET);

	if (i == USB2_OTG_PHY) {
	regmap_update_bits(priv->regmap,
	U2P_R0 + (U2P_REG_SIZE * i),
	U2P_R0_ID_PULLUP \| U2P_R0_DRV_VBUS,
	U2P_R0_ID_PULLUP \| U2P_R0_DRV_VBUS);

	dwc3_meson_g12a_usb2_set_mode(priv, i,
	priv->otg_phy_mode);
	} else
	dwc3_meson_g12a_usb2_set_mode(priv, i,
	USB_DR_MODE_HOST);

	regmap_update_bits(priv->regmap, U2P_R0 + (U2P_REG_SIZE * i),
	U2P_R0_POWER_ON_RESET, 0);
	}

	return 0;
	}

	static void dwc3_meson_g12a_usb3_init(struct dwc3_meson_g12a *priv)
	{
	regmap_update_bits(priv->regmap, USB_R3,
	USB_R3_P30_SSC_RANGE_MASK \|
	USB_R3_P30_REF_SSP_EN,
	USB_R3_P30_SSC_ENABLE \|
	FIELD_PREP(USB_R3_P30_SSC_RANGE_MASK, 2) \|
	USB_R3_P30_REF_SSP_EN);
	udelay(2);

	regmap_update_bits(priv->regmap, USB_R2,
	USB_R2_P30_PCS_TX_DEEMPH_3P5DB_MASK,
	FIELD_PREP(USB_R2_P30_PCS_TX_DEEMPH_3P5DB_MASK, 0x15));

	regmap_update_bits(priv->regmap, USB_R2,
	USB_R2_P30_PCS_TX_DEEMPH_6DB_MASK,
	FIELD_PREP(USB_R2_P30_PCS_TX_DEEMPH_6DB_MASK, 0x20));

	udelay(2);

	regmap_update_bits(priv->regmap, USB_R1,
	USB_R1_U3H_HOST_PORT_POWER_CONTROL_PRESENT,
	USB_R1_U3H_HOST_PORT_POWER_CONTROL_PRESENT);

	regmap_update_bits(priv->regmap, USB_R1,
	USB_R1_P30_PCS_TX_SWING_FULL_MASK,
	FIELD_PREP(USB_R1_P30_PCS_TX_SWING_FULL_MASK, 127));
	}

	static void dwc3_meson_g12a_usb_init_mode(struct dwc3_meson_g12a *priv)
	{
	if (priv->otg_phy_mode == USB_DR_MODE_PERIPHERAL) {
	regmap_update_bits(priv->regmap, USB_R0,
	USB_R0_U2D_ACT, USB_R0_U2D_ACT);
	regmap_update_bits(priv->regmap, USB_R0,
	USB_R0_U2D_SS_SCALEDOWN_MODE_MASK, 0);
	regmap_update_bits(priv->regmap, USB_R4,
	USB_R4_P21_SLEEP_M0, USB_R4_P21_SLEEP_M0);
	} else {
	regmap_update_bits(priv->regmap, USB_R0,
	USB_R0_U2D_ACT, 0);
	regmap_update_bits(priv->regmap, USB_R4,
	USB_R4_P21_SLEEP_M0, 0);
	}
	}

	static int dwc3_meson_g12a_usb_init(struct dwc3_meson_g12a *priv)
	{
	int ret;

	ret = dwc3_meson_g12a_usb2_init(priv);
	if (ret)
	return ret;

	regmap_update_bits(priv->regmap, USB_R1,
	USB_R1_U3H_FLADJ_30MHZ_REG_MASK,
	FIELD_PREP(USB_R1_U3H_FLADJ_30MHZ_REG_MASK, 0x20));

	regmap_update_bits(priv->regmap, USB_R5,
	USB_R5_ID_DIG_EN_0,
	USB_R5_ID_DIG_EN_0);
	regmap_update_bits(priv->regmap, USB_R5,
	USB_R5_ID_DIG_EN_1,
	USB_R5_ID_DIG_EN_1);
	regmap_update_bits(priv->regmap, USB_R5,
	USB_R5_ID_DIG_TH_MASK,
	FIELD_PREP(USB_R5_ID_DIG_TH_MASK, 0xff));

	/* If we have an actual SuperSpeed port, initialize it */
	if (priv->usb3_ports)
	dwc3_meson_g12a_usb3_init(priv);

	dwc3_meson_g12a_usb_init_mode(priv);

	return 0;
	}

	int dwc3_meson_g12a_force_mode(struct udevice *dev, enum usb_dr_mode mode)
	{
	struct dwc3_meson_g12a *priv = dev_get_platdata(dev);

	if (!priv)
	return -EINVAL;

	if (mode != USB_DR_MODE_HOST && mode != USB_DR_MODE_PERIPHERAL)
	return -EINVAL;

	if (!priv->phys[USB2_OTG_PHY].dev)
	return -EINVAL;

	if (mode == USB_DR_MODE_HOST)
	debug("%s: switching to Host Mode\n", __func__);
	else
	debug("%s: switching to Device Mode\n", __func__);

	#if CONFIG_IS_ENABLED(DM_REGULATOR)
	if (priv->vbus_supply) {
	int ret = regulator_set_enable(priv->vbus_supply,
	(mode == USB_DR_MODE_PERIPHERAL));
	if (ret)
	return ret;
	}
	#endif
	priv->otg_phy_mode = mode;

	dwc3_meson_g12a_usb2_set_mode(priv, USB2_OTG_PHY, mode);

	dwc3_meson_g12a_usb_init_mode(priv);

	return 0;
	}

	static int dwc3_meson_g12a_get_phys(struct dwc3_meson_g12a *priv)
	{
	int i, ret;

	for (i = 0 ; i < PHY_COUNT ; ++i) {
	ret = generic_phy_get_by_name(priv->dev, phy_names[i],
	&priv->phys[i]);
	if (ret == -ENOENT)
	continue;

	if (ret)
	return ret;

	if (i == USB3_HOST_PHY)
	priv->usb3_ports++;
	else
	priv->usb2_ports++;
	}

	debug("%s: usb2 ports: %d\n", __func__, priv->usb2_ports);
	debug("%s: usb3 ports: %d\n", __func__, priv->usb3_ports);

	return 0;
	}

	static int dwc3_meson_g12a_reset_init(struct dwc3_meson_g12a *priv)
	{
	int ret;

	ret = reset_get_by_index(priv->dev, 0, &priv->reset);
	if (ret)
	return ret;

	ret = reset_assert(&priv->reset);
	udelay(1);
	ret \|= reset_deassert(&priv->reset);
	if (ret) {
	reset_free(&priv->reset);
	return ret;
	}

	return 0;
	}

	static int dwc3_meson_g12a_clk_init(struct dwc3_meson_g12a *priv)
	{
	int ret;

	ret = clk_get_by_index(priv->dev, 0, &priv->clk);
	if (ret)
	return ret;

	#if CONFIG_IS_ENABLED(CLK)
	ret = clk_enable(&priv->clk);
	if (ret) {
	clk_free(&priv->clk);
	return ret;
	}
	#endif

	return 0;
	}

	static int dwc3_meson_g12a_probe(struct udevice *dev)
	{
	struct dwc3_meson_g12a *priv = dev_get_platdata(dev);
	int ret, i;

	priv->dev = dev;

	ret = regmap_init_mem(dev_ofnode(dev), &priv->regmap);
	if (ret)
	return ret;

	ret = dwc3_meson_g12a_clk_init(priv);
	if (ret)
	return ret;

	ret = dwc3_meson_g12a_reset_init(priv);
	if (ret)
	return ret;

	ret = dwc3_meson_g12a_get_phys(priv);
	if (ret)
	return ret;

	#if CONFIG_IS_ENABLED(DM_REGULATOR)
	ret = device_get_supply_regulator(dev, "vbus-supply",
	&priv->vbus_supply);
	if (ret && ret != -ENOENT) {
	pr_err("Failed to get PHY regulator\n");
	return ret;
	}

	if (priv->vbus_supply) {
	ret = regulator_set_enable(priv->vbus_supply, true);
	if (ret)
	return ret;
	}
	#endif

	priv->otg_mode = usb_get_dr_mode(dev->node);

	ret = dwc3_meson_g12a_usb_init(priv);
	if (ret)
	return ret;

	for (i = 0 ; i < PHY_COUNT ; ++i) {
	if (!priv->phys[i].dev)
	continue;

	ret = generic_phy_init(&priv->phys[i]);
	if (ret)
	goto err_phy_init;
	}

	for (i = 0; i < PHY_COUNT; ++i) {
	if (!priv->phys[i].dev)
	continue;

	ret = generic_phy_power_on(&priv->phys[i]);
	if (ret)
	goto err_phy_init;
	}

	return 0;

	err_phy_init:
	for (i = 0 ; i < PHY_COUNT ; ++i) {
	if (!priv->phys[i].dev)
	continue;

	generic_phy_exit(&priv->phys[i]);
	}

	return ret;
	}

	static int dwc3_meson_g12a_remove(struct udevice *dev)
	{
	struct dwc3_meson_g12a *priv = dev_get_platdata(dev);
	int i;

	reset_release_all(&priv->reset, 1);

	clk_release_all(&priv->clk, 1);

	for (i = 0; i < PHY_COUNT; ++i) {
	if (!priv->phys[i].dev)
	continue;

	generic_phy_power_off(&priv->phys[i]);
	}

	for (i = 0 ; i < PHY_COUNT ; ++i) {
	if (!priv->phys[i].dev)
	continue;

	generic_phy_exit(&priv->phys[i]);
	}

	return dm_scan_fdt_dev(dev);
	}

	static const struct udevice_id dwc3_meson_g12a_ids[] = {
	{ .compatible = "amlogic,meson-g12a-usb-ctrl" },
	{ }
	};

	U_BOOT_DRIVER(dwc3_generic_wrapper) = {
	.name = "dwc3-meson-g12a",
	.id = UCLASS_SIMPLE_BUS,
	.of_match = dwc3_meson_g12a_ids,
	.probe = dwc3_meson_g12a_probe,
	.remove = dwc3_meson_g12a_remove,
	.platdata_auto_alloc_size = sizeof(struct dwc3_meson_g12a),

	};