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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Meson G12A USB2 PHY driver
- *
- * Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
- * Copyright (C) 2019 BayLibre, SAS
- * Author: Neil Armstrong <narmstron@baylibre.com>
- */
- #include <common.h>
- #include <log.h>
- #include <malloc.h>
- #include <asm/io.h>
- #include <bitfield.h>
- #include <dm.h>
- #include <errno.h>
- #include <generic-phy.h>
- #include <regmap.h>
- #include <linux/delay.h>
- #include <power/regulator.h>
- #include <reset.h>
- #include <clk.h>
- #include <linux/bitops.h>
- #include <linux/compat.h>
- #define PHY_CTRL_R0 0x0
- #define PHY_CTRL_R1 0x4
- #define PHY_CTRL_R2 0x8
- #define PHY_CTRL_R3 0xc
- #define PHY_CTRL_R4 0x10
- #define PHY_CTRL_R5 0x14
- #define PHY_CTRL_R6 0x18
- #define PHY_CTRL_R7 0x1c
- #define PHY_CTRL_R8 0x20
- #define PHY_CTRL_R9 0x24
- #define PHY_CTRL_R10 0x28
- #define PHY_CTRL_R11 0x2c
- #define PHY_CTRL_R12 0x30
- #define PHY_CTRL_R13 0x34
- #define PHY_CTRL_R14 0x38
- #define PHY_CTRL_R15 0x3c
- #define PHY_CTRL_R16 0x40
- #define PHY_CTRL_R17 0x44
- #define PHY_CTRL_R18 0x48
- #define PHY_CTRL_R19 0x4c
- #define PHY_CTRL_R20 0x50
- #define PHY_CTRL_R21 0x54
- #define PHY_CTRL_R22 0x58
- #define PHY_CTRL_R23 0x5c
- #define RESET_COMPLETE_TIME 1000
- #define PLL_RESET_COMPLETE_TIME 100
- struct phy_meson_g12a_usb2_priv {
- struct regmap *regmap;
- #if CONFIG_IS_ENABLED(DM_REGULATOR)
- struct udevice *phy_supply;
- #endif
- #if CONFIG_IS_ENABLED(CLK)
- struct clk clk;
- #endif
- struct reset_ctl reset;
- };
- static int phy_meson_g12a_usb2_power_on(struct phy *phy)
- {
- struct udevice *dev = phy->dev;
- struct phy_meson_g12a_usb2_priv *priv = dev_get_priv(dev);
- #if CONFIG_IS_ENABLED(DM_REGULATOR)
- if (priv->phy_supply) {
- int ret = regulator_set_enable(priv->phy_supply, true);
- if (ret)
- return ret;
- }
- #endif
- return 0;
- }
- static int phy_meson_g12a_usb2_power_off(struct phy *phy)
- {
- struct udevice *dev = phy->dev;
- struct phy_meson_g12a_usb2_priv *priv = dev_get_priv(dev);
- #if CONFIG_IS_ENABLED(DM_REGULATOR)
- if (priv->phy_supply) {
- int ret = regulator_set_enable(priv->phy_supply, false);
- if (ret) {
- pr_err("Error disabling PHY supply\n");
- return ret;
- }
- }
- #endif
- return 0;
- }
- static int phy_meson_g12a_usb2_init(struct phy *phy)
- {
- struct udevice *dev = phy->dev;
- struct phy_meson_g12a_usb2_priv *priv = dev_get_priv(dev);
- int ret;
- ret = reset_assert(&priv->reset);
- udelay(1);
- ret |= reset_deassert(&priv->reset);
- if (ret)
- return ret;
- udelay(RESET_COMPLETE_TIME);
- /* usb2_otg_aca_en == 0 */
- regmap_update_bits(priv->regmap, PHY_CTRL_R21, BIT(2), 0);
- /* PLL Setup : 24MHz * 20 / 1 = 480MHz */
- regmap_write(priv->regmap, PHY_CTRL_R16, 0x39400414);
- regmap_write(priv->regmap, PHY_CTRL_R17, 0x927e0000);
- regmap_write(priv->regmap, PHY_CTRL_R18, 0xac5f49e5);
- udelay(PLL_RESET_COMPLETE_TIME);
- /* UnReset PLL */
- regmap_write(priv->regmap, PHY_CTRL_R16, 0x19400414);
- /* PHY Tuning */
- regmap_write(priv->regmap, PHY_CTRL_R20, 0xfe18);
- regmap_write(priv->regmap, PHY_CTRL_R4, 0x8000fff);
- /* Tuning Disconnect Threshold */
- regmap_write(priv->regmap, PHY_CTRL_R3, 0x34);
- /* Analog Settings */
- regmap_write(priv->regmap, PHY_CTRL_R14, 0);
- regmap_write(priv->regmap, PHY_CTRL_R13, 0x78000);
- return 0;
- }
- static int phy_meson_g12a_usb2_exit(struct phy *phy)
- {
- struct udevice *dev = phy->dev;
- struct phy_meson_g12a_usb2_priv *priv = dev_get_priv(dev);
- int ret;
- ret = reset_assert(&priv->reset);
- if (ret)
- return ret;
- return 0;
- }
- struct phy_ops meson_g12a_usb2_phy_ops = {
- .init = phy_meson_g12a_usb2_init,
- .exit = phy_meson_g12a_usb2_exit,
- .power_on = phy_meson_g12a_usb2_power_on,
- .power_off = phy_meson_g12a_usb2_power_off,
- };
- int meson_g12a_usb2_phy_probe(struct udevice *dev)
- {
- struct phy_meson_g12a_usb2_priv *priv = dev_get_priv(dev);
- int ret;
- ret = regmap_init_mem(dev_ofnode(dev), &priv->regmap);
- if (ret)
- return ret;
- ret = reset_get_by_index(dev, 0, &priv->reset);
- if (ret == -ENOTSUPP)
- return 0;
- else if (ret)
- return ret;
- ret = reset_deassert(&priv->reset);
- if (ret) {
- reset_release_all(&priv->reset, 1);
- return ret;
- }
- #if CONFIG_IS_ENABLED(CLK)
- ret = clk_get_by_index(dev, 0, &priv->clk);
- if (ret < 0)
- return ret;
- ret = clk_enable(&priv->clk);
- if (ret && ret != -ENOSYS && ret != -ENOTSUPP) {
- pr_err("failed to enable PHY clock\n");
- clk_free(&priv->clk);
- return ret;
- }
- #endif
- #if CONFIG_IS_ENABLED(DM_REGULATOR)
- ret = device_get_supply_regulator(dev, "phy-supply", &priv->phy_supply);
- if (ret && ret != -ENOENT) {
- pr_err("Failed to get PHY regulator\n");
- return ret;
- }
- #endif
- return 0;
- }
- static const struct udevice_id meson_g12a_usb2_phy_ids[] = {
- { .compatible = "amlogic,g12a-usb2-phy" },
- { }
- };
- U_BOOT_DRIVER(meson_g12a_usb2_phy) = {
- .name = "meson_g12a_usb2_phy",
- .id = UCLASS_PHY,
- .of_match = meson_g12a_usb2_phy_ids,
- .probe = meson_g12a_usb2_phy_probe,
- .ops = &meson_g12a_usb2_phy_ops,
- .priv_auto_alloc_size = sizeof(struct phy_meson_g12a_usb2_priv),
- };
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