// SPDX-License-Identifier: GPL-2.0+ /* * Meson GXL and GXM USB2 PHY driver * * Copyright (C) 2017 Martin Blumenstingl * Copyright (C) 2018 BayLibre, SAS * Author: Neil Armstrong */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* 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(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); } void phy_meson_gxl_usb2_set_mode(struct phy *phy, enum usb_dr_mode mode) { 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); switch (mode) { case USB_DR_MODE_UNKNOWN: case USB_DR_MODE_HOST: case USB_DR_MODE_OTG: val |= U2P_R0_DM_PULLDOWN; val |= U2P_R0_DP_PULLDOWN; val &= ~U2P_R0_ID_PULLUP; break; case USB_DR_MODE_PERIPHERAL: val &= ~U2P_R0_DM_PULLDOWN; val &= ~U2P_R0_DP_PULLDOWN; val |= U2P_R0_ID_PULLUP; break; } 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_mode(phy, USB_DR_MODE_HOST); 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); 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"); 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 = sizeof(struct phy_meson_gxl_usb2_priv), };