meson-g12a-usb2.c
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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 <malloc.h>
#include <asm/io.h>
#include <bitfield.h>
#include <dm.h>
#include <errno.h>
#include <generic-phy.h>
#include <regmap.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),
};