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// SPDX-License-Identifier: GPL-2.0+
/*
* Meson8, Meson8b and GXBB USB2 PHY driver
*
* Copyright (C) 2016 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
* Copyright (C) 2018 BayLibre, SAS
*
* Author: Beniamino Galvani <b.galvani@gmail.com>
*/
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <generic-phy.h>
#include <power/regulator.h>
#include <regmap.h>
#include <reset.h>
#include <linux/bitops.h>
#define REG_CONFIG 0x00
#define REG_CONFIG_CLK_EN BIT(0)
#define REG_CONFIG_CLK_SEL_MASK GENMASK(3, 1)
#define REG_CONFIG_CLK_DIV_MASK GENMASK(10, 4)
#define REG_CONFIG_CLK_32k_ALTSEL BIT(15)
#define REG_CONFIG_TEST_TRIG BIT(31)
#define REG_CTRL 0x04
#define REG_CTRL_SOFT_PRST BIT(0)
#define REG_CTRL_SOFT_HRESET BIT(1)
#define REG_CTRL_SS_SCALEDOWN_MODE_MASK GENMASK(3, 2)
#define REG_CTRL_CLK_DET_RST BIT(4)
#define REG_CTRL_INTR_SEL BIT(5)
#define REG_CTRL_CLK_DETECTED BIT(8)
#define REG_CTRL_SOF_SENT_RCVD_TGL BIT(9)
#define REG_CTRL_SOF_TOGGLE_OUT BIT(10)
#define REG_CTRL_POWER_ON_RESET BIT(15)
#define REG_CTRL_SLEEPM BIT(16)
#define REG_CTRL_TX_BITSTUFF_ENN_H BIT(17)
#define REG_CTRL_TX_BITSTUFF_ENN BIT(18)
#define REG_CTRL_COMMON_ON BIT(19)
#define REG_CTRL_REF_CLK_SEL_MASK GENMASK(21, 20)
#define REG_CTRL_REF_CLK_SEL_SHIFT 20
#define REG_CTRL_FSEL_MASK GENMASK(24, 22)
#define REG_CTRL_FSEL_SHIFT 22
#define REG_CTRL_PORT_RESET BIT(25)
#define REG_CTRL_THREAD_ID_MASK GENMASK(31, 26)
/* bits [31:26], [24:21] and [15:3] seem to be read-only */
#define REG_ADP_BC 0x0c
#define REG_ADP_BC_VBUS_VLD_EXT_SEL BIT(0)
#define REG_ADP_BC_VBUS_VLD_EXT BIT(1)
#define REG_ADP_BC_OTG_DISABLE BIT(2)
#define REG_ADP_BC_ID_PULLUP BIT(3)
#define REG_ADP_BC_DRV_VBUS BIT(4)
#define REG_ADP_BC_ADP_PRB_EN BIT(5)
#define REG_ADP_BC_ADP_DISCHARGE BIT(6)
#define REG_ADP_BC_ADP_CHARGE BIT(7)
#define REG_ADP_BC_SESS_END BIT(8)
#define REG_ADP_BC_DEVICE_SESS_VLD BIT(9)
#define REG_ADP_BC_B_VALID BIT(10)
#define REG_ADP_BC_A_VALID BIT(11)
#define REG_ADP_BC_ID_DIG BIT(12)
#define REG_ADP_BC_VBUS_VALID BIT(13)
#define REG_ADP_BC_ADP_PROBE BIT(14)
#define REG_ADP_BC_ADP_SENSE BIT(15)
#define REG_ADP_BC_ACA_ENABLE BIT(16)
#define REG_ADP_BC_DCD_ENABLE BIT(17)
#define REG_ADP_BC_VDAT_DET_EN_B BIT(18)
#define REG_ADP_BC_VDAT_SRC_EN_B BIT(19)
#define REG_ADP_BC_CHARGE_SEL BIT(20)
#define REG_ADP_BC_CHARGE_DETECT BIT(21)
#define REG_ADP_BC_ACA_PIN_RANGE_C BIT(22)
#define REG_ADP_BC_ACA_PIN_RANGE_B BIT(23)
#define REG_ADP_BC_ACA_PIN_RANGE_A BIT(24)
#define REG_ADP_BC_ACA_PIN_GND BIT(25)
#define REG_ADP_BC_ACA_PIN_FLOAT BIT(26)
#define RESET_COMPLETE_TIME 500
#define ACA_ENABLE_COMPLETE_TIME 50
struct phy_meson_gxbb_usb2_priv {
struct regmap *regmap;
struct reset_ctl_bulk resets;
#if CONFIG_IS_ENABLED(DM_REGULATOR)
struct udevice *phy_supply;
#endif
};
static int phy_meson_gxbb_usb2_power_on(struct phy *phy)
{
struct udevice *dev = phy->dev;
struct phy_meson_gxbb_usb2_priv *priv = dev_get_priv(dev);
uint val;
#if CONFIG_IS_ENABLED(DM_REGULATOR)
if (priv->phy_supply) {
int ret = regulator_set_enable(priv->phy_supply, true);
if (ret)
return ret;
}
#endif
regmap_update_bits(priv->regmap, REG_CONFIG,
REG_CONFIG_CLK_32k_ALTSEL,
REG_CONFIG_CLK_32k_ALTSEL);
regmap_update_bits(priv->regmap, REG_CTRL,
REG_CTRL_REF_CLK_SEL_MASK,
0x2 << REG_CTRL_REF_CLK_SEL_SHIFT);
regmap_update_bits(priv->regmap, REG_CTRL,
REG_CTRL_FSEL_MASK,
0x5 << REG_CTRL_FSEL_SHIFT);
/* reset the PHY */
regmap_update_bits(priv->regmap, REG_CTRL,
REG_CTRL_POWER_ON_RESET,
REG_CTRL_POWER_ON_RESET);
udelay(RESET_COMPLETE_TIME);
regmap_update_bits(priv->regmap, REG_CTRL,
REG_CTRL_POWER_ON_RESET,
0);
udelay(RESET_COMPLETE_TIME);
regmap_update_bits(priv->regmap, REG_CTRL,
REG_CTRL_SOF_TOGGLE_OUT,
REG_CTRL_SOF_TOGGLE_OUT);
/* Set host mode */
regmap_update_bits(priv->regmap, REG_ADP_BC,
REG_ADP_BC_ACA_ENABLE,
REG_ADP_BC_ACA_ENABLE);
udelay(ACA_ENABLE_COMPLETE_TIME);
regmap_read(priv->regmap, REG_ADP_BC, &val);
if (val & REG_ADP_BC_ACA_PIN_FLOAT) {
pr_err("Error powering on GXBB USB PHY\n");
return -EINVAL;
}
return 0;
}
static int phy_meson_gxbb_usb2_power_off(struct phy *phy)
{
#if CONFIG_IS_ENABLED(DM_REGULATOR)
struct udevice *dev = phy->dev;
struct phy_meson_gxbb_usb2_priv *priv = dev_get_priv(dev);
if (priv->phy_supply) {
int ret = regulator_set_enable(priv->phy_supply, false);
if (ret)
return ret;
}
#endif
return 0;
}
static struct phy_ops meson_gxbb_usb2_phy_ops = {
.power_on = phy_meson_gxbb_usb2_power_on,
.power_off = phy_meson_gxbb_usb2_power_off,
};
static int meson_gxbb_usb2_phy_probe(struct udevice *dev)
{
struct phy_meson_gxbb_usb2_priv *priv = dev_get_priv(dev);
struct clk clk_usb_general, clk_usb;
int ret;
ret = regmap_init_mem(dev_ofnode(dev), &priv->regmap);
if (ret)
return ret;
ret = clk_get_by_name(dev, "usb_general", &clk_usb_general);
if (ret)
return ret;
ret = clk_enable(&clk_usb_general);
if (ret && ret != -ENOSYS && ret != -ENOTSUPP) {
pr_err("Failed to enable PHY general clock\n");
return ret;
}
ret = clk_get_by_name(dev, "usb", &clk_usb);
if (ret)
return ret;
ret = clk_enable(&clk_usb);
if (ret && ret != -ENOSYS && ret != -ENOTSUPP) {
pr_err("Failed to enable PHY clock\n");
return ret;
}
#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
ret = reset_get_bulk(dev, &priv->resets);
if (!ret) {
ret = reset_deassert_bulk(&priv->resets);
if (ret) {
pr_err("Failed to deassert reset\n");
return ret;
}
}
return 0;
}
static int meson_gxbb_usb2_phy_remove(struct udevice *dev)
{
struct phy_meson_gxbb_usb2_priv *priv = dev_get_priv(dev);
return reset_release_bulk(&priv->resets);
}
static const struct udevice_id meson_gxbb_usb2_phy_ids[] = {
{ .compatible = "amlogic,meson8-usb2-phy" },
{ .compatible = "amlogic,meson8b-usb2-phy" },
{ .compatible = "amlogic,meson-gxbb-usb2-phy" },
{ }
};
U_BOOT_DRIVER(meson_gxbb_usb2_phy) = {
.name = "meson_gxbb_usb2_phy",
.id = UCLASS_PHY,
.of_match = meson_gxbb_usb2_phy_ids,
.probe = meson_gxbb_usb2_phy_probe,
.remove = meson_gxbb_usb2_phy_remove,
.ops = &meson_gxbb_usb2_phy_ops,
.priv_auto = sizeof(struct phy_meson_gxbb_usb2_priv),
};
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