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meson-gxl-usb2.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Meson GXL and GXM USB2 PHY driver
*
* Copyright (C) 2017 Martin Blumenstingl <[email protected]>
* Copyright (C) 2018 BayLibre, SAS
* Author: Neil Armstrong <[email protected]>
*/
#include <common.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 <clk.h>
#include <linux/bitops.h>
#include <linux/compat.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_TESTDATA_IN_MASK GENMASK(7, 0)
#define U2P_R2_TESTADDR_MASK GENMASK(11, 8)
#define U2P_R2_TESTDATA_OUT_SEL BIT(12)
#define U2P_R2_TESTCLK BIT(13)
#define U2P_R2_TESTDATA_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;
#if CONFIG_IS_ENABLED(DM_REGULATOR)
struct udevice *phy_supply;
#endif
#if CONFIG_IS_ENABLED(CLK)
struct clk clk;
#endif
};
static void phy_meson_gxl_usb2_reset(struct phy_meson_gxl_usb2_priv *priv)
{
uint val;
regmap_read(priv->regmap, U2P_R0, &val);
/* reset the PHY and wait until settings are stabilized */
val |= U2P_R0_POWER_ON_RESET;
regmap_write(priv->regmap, U2P_R0, val);
udelay(RESET_COMPLETE_TIME);
val &= ~U2P_R0_POWER_ON_RESET;
regmap_write(priv->regmap, U2P_R0, val);
udelay(RESET_COMPLETE_TIME);
}
static void
phy_meson_gxl_usb2_set_host_mode(struct phy_meson_gxl_usb2_priv *priv)
{
uint val;
regmap_read(priv->regmap, U2P_R0, &val);
val |= U2P_R0_DM_PULLDOWN;
val |= U2P_R0_DP_PULLDOWN;
val &= ~U2P_R0_ID_PULLUP;
regmap_write(priv->regmap, U2P_R0, val);
phy_meson_gxl_usb2_reset(priv);
}
static int phy_meson_gxl_usb2_power_on(struct phy *phy)
{
struct udevice *dev = phy->dev;
struct phy_meson_gxl_usb2_priv *priv = dev_get_priv(dev);
uint val;
regmap_read(priv->regmap, U2P_R0, &val);
/* power on the PHY by taking it out of reset mode */
val &= ~U2P_R0_POWER_ON_RESET;
regmap_write(priv->regmap, U2P_R0, val);
phy_meson_gxl_usb2_set_host_mode(priv);
#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_gxl_usb2_power_off(struct phy *phy)
{
struct udevice *dev = phy->dev;
struct phy_meson_gxl_usb2_priv *priv = dev_get_priv(dev);
uint val;
regmap_read(priv->regmap, U2P_R0, &val);
/* power off the PHY by putting it into reset mode */
val |= U2P_R0_POWER_ON_RESET;
regmap_write(priv->regmap, U2P_R0, val);
#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;
}
struct phy_ops meson_gxl_usb2_phy_ops = {
.power_on = phy_meson_gxl_usb2_power_on,
.power_off = phy_meson_gxl_usb2_power_off,
};
int meson_gxl_usb2_phy_probe(struct udevice *dev)
{
struct phy_meson_gxl_usb2_priv *priv = dev_get_priv(dev);
int ret;
ret = regmap_init_mem(dev_ofnode(dev), &priv->regmap);
if (ret)
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_gxl_usb2_phy_ids[] = {
{ .compatible = "amlogic,meson-gxl-usb2-phy" },
{ }
};
U_BOOT_DRIVER(meson_gxl_usb2_phy) = {
.name = "meson_gxl_usb2_phy",
.id = UCLASS_PHY,
.of_match = meson_gxl_usb2_phy_ids,
.probe = meson_gxl_usb2_phy_probe,
.ops = &meson_gxl_usb2_phy_ops,
.priv_auto_alloc_size = sizeof(struct phy_meson_gxl_usb2_priv),
};