diff options
Diffstat (limited to 'drivers/phy')
| -rw-r--r-- | drivers/phy/amlogic/Kconfig | 12 | ||||
| -rw-r--r-- | drivers/phy/amlogic/Makefile | 1 | ||||
| -rw-r--r-- | drivers/phy/amlogic/phy-meson-gxl-usb3.c | 282 |
3 files changed, 295 insertions, 0 deletions
diff --git a/drivers/phy/amlogic/Kconfig b/drivers/phy/amlogic/Kconfig index ef3625cd25bb..23fe1cda2f70 100644 --- a/drivers/phy/amlogic/Kconfig +++ b/drivers/phy/amlogic/Kconfig @@ -24,3 +24,15 @@ config PHY_MESON_GXL_USB2 Enable this to support the Meson USB2 PHYs found in Meson GXL and GXM SoCs. If unsure, say N. + +config PHY_MESON_GXL_USB3 + tristate "Meson GXL and GXM USB3 PHY drivers" + default ARCH_MESON + depends on OF && (ARCH_MESON || COMPILE_TEST) + depends on USB_SUPPORT + select GENERIC_PHY + select REGMAP_MMIO + help + Enable this to support the Meson USB3 PHY and OTG detection + IP block found in Meson GXL and GXM SoCs. + If unsure, say N. diff --git a/drivers/phy/amlogic/Makefile b/drivers/phy/amlogic/Makefile index cfdc98715c30..4fd8848c194d 100644 --- a/drivers/phy/amlogic/Makefile +++ b/drivers/phy/amlogic/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_PHY_MESON8B_USB2) += phy-meson8b-usb2.o obj-$(CONFIG_PHY_MESON_GXL_USB2) += phy-meson-gxl-usb2.o +obj-$(CONFIG_PHY_MESON_GXL_USB3) += phy-meson-gxl-usb3.o diff --git a/drivers/phy/amlogic/phy-meson-gxl-usb3.c b/drivers/phy/amlogic/phy-meson-gxl-usb3.c new file mode 100644 index 000000000000..d37d94ddf9c0 --- /dev/null +++ b/drivers/phy/amlogic/phy-meson-gxl-usb3.c @@ -0,0 +1,282 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Meson GXL USB3 PHY and OTG mode detection driver + * + * Copyright (C) 2018 Martin Blumenstingl <martin.blumenstingl@googlemail.com> + */ + +#include <linux/bitfield.h> +#include <linux/bitops.h> +#include <linux/clk.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/phy/phy.h> +#include <linux/regmap.h> +#include <linux/reset.h> +#include <linux/platform_device.h> + +#define USB_R0 0x00 + #define USB_R0_P30_FSEL_MASK GENMASK(5, 0) + #define USB_R0_P30_PHY_RESET BIT(6) + #define USB_R0_P30_TEST_POWERDOWN_HSP BIT(7) + #define USB_R0_P30_TEST_POWERDOWN_SSP BIT(8) + #define USB_R0_P30_ACJT_LEVEL_MASK GENMASK(13, 9) + #define USB_R0_P30_TX_BOOST_LEVEL_MASK GENMASK(16, 14) + #define USB_R0_P30_LANE0_TX2RX_LOOPBACK BIT(17) + #define USB_R0_P30_LANE0_EXT_PCLK_REQ BIT(18) + #define USB_R0_P30_PCS_RX_LOS_MASK_VAL_MASK GENMASK(28, 19) + #define USB_R0_U2D_SS_SCALEDOWN_MODE_MASK GENMASK(30, 29) + #define USB_R0_U2D_ACT BIT(31) + +#define USB_R1 0x04 + #define USB_R1_U3H_BIGENDIAN_GS BIT(0) + #define USB_R1_U3H_PME_ENABLE BIT(1) + #define USB_R1_U3H_HUB_PORT_OVERCURRENT_MASK GENMASK(6, 2) + #define USB_R1_U3H_HUB_PORT_PERM_ATTACH_MASK GENMASK(11, 7) + #define USB_R1_U3H_HOST_U2_PORT_DISABLE_MASK GENMASK(15, 12) + #define USB_R1_U3H_HOST_U3_PORT_DISABLE BIT(16) + #define USB_R1_U3H_HOST_PORT_POWER_CONTROL_PRESENT BIT(17) + #define USB_R1_U3H_HOST_MSI_ENABLE BIT(18) + #define USB_R1_U3H_FLADJ_30MHZ_REG_MASK GENMASK(24, 19) + #define USB_R1_P30_PCS_TX_SWING_FULL_MASK GENMASK(31, 25) + +#define USB_R2 0x08 + #define USB_R2_P30_CR_DATA_IN_MASK GENMASK(15, 0) + #define USB_R2_P30_CR_READ BIT(16) + #define USB_R2_P30_CR_WRITE BIT(17) + #define USB_R2_P30_CR_CAP_ADDR BIT(18) + #define USB_R2_P30_CR_CAP_DATA BIT(19) + #define USB_R2_P30_PCS_TX_DEEMPH_3P5DB_MASK GENMASK(25, 20) + #define USB_R2_P30_PCS_TX_DEEMPH_6DB_MASK GENMASK(31, 26) + +#define USB_R3 0x0c + #define USB_R3_P30_SSC_ENABLE BIT(0) + #define USB_R3_P30_SSC_RANGE_MASK GENMASK(3, 1) + #define USB_R3_P30_SSC_REF_CLK_SEL_MASK GENMASK(12, 4) + #define USB_R3_P30_REF_SSP_EN BIT(13) + #define USB_R3_P30_LOS_BIAS_MASK GENMASK(18, 16) + #define USB_R3_P30_LOS_LEVEL_MASK GENMASK(23, 19) + #define USB_R3_P30_MPLL_MULTIPLIER_MASK GENMASK(30, 24) + +#define USB_R4 0x10 + #define USB_R4_P21_PORT_RESET_0 BIT(0) + #define USB_R4_P21_SLEEP_M0 BIT(1) + #define USB_R4_MEM_PD_MASK GENMASK(3, 2) + #define USB_R4_P21_ONLY BIT(4) + +#define USB_R5 0x14 + #define USB_R5_ID_DIG_SYNC BIT(0) + #define USB_R5_ID_DIG_REG BIT(1) + #define USB_R5_ID_DIG_CFG_MASK GENMASK(3, 2) + #define USB_R5_ID_DIG_EN_0 BIT(4) + #define USB_R5_ID_DIG_EN_1 BIT(5) + #define USB_R5_ID_DIG_CURR BIT(6) + #define USB_R5_ID_DIG_IRQ BIT(7) + #define USB_R5_ID_DIG_TH_MASK GENMASK(15, 8) + #define USB_R5_ID_DIG_CNT_MASK GENMASK(23, 16) + +/* read-only register */ +#define USB_R6 0x18 + #define USB_R6_P30_CR_DATA_OUT_MASK GENMASK(15, 0) + #define USB_R6_P30_CR_ACK BIT(16) + +struct phy_meson_gxl_usb3_priv { + struct regmap *regmap; + enum phy_mode mode; + struct clk *clk_phy; + struct clk *clk_peripheral; + struct reset_control *reset; +}; + +static const struct regmap_config phy_meson_gxl_usb3_regmap_conf = { + .reg_bits = 8, + .val_bits = 32, + .reg_stride = 4, + .max_register = USB_R6, +}; + +static int phy_meson_gxl_usb3_power_on(struct phy *phy) +{ + struct phy_meson_gxl_usb3_priv *priv = phy_get_drvdata(phy); + + regmap_update_bits(priv->regmap, USB_R5, USB_R5_ID_DIG_EN_0, + USB_R5_ID_DIG_EN_0); + regmap_update_bits(priv->regmap, USB_R5, USB_R5_ID_DIG_EN_1, + USB_R5_ID_DIG_EN_1); + regmap_update_bits(priv->regmap, USB_R5, USB_R5_ID_DIG_TH_MASK, + FIELD_PREP(USB_R5_ID_DIG_TH_MASK, 0xff)); + + return 0; +} + +static int phy_meson_gxl_usb3_power_off(struct phy *phy) +{ + struct phy_meson_gxl_usb3_priv *priv = phy_get_drvdata(phy); + + regmap_update_bits(priv->regmap, USB_R5, USB_R5_ID_DIG_EN_0, 0); + regmap_update_bits(priv->regmap, USB_R5, USB_R5_ID_DIG_EN_1, 0); + + return 0; +} + +static int phy_meson_gxl_usb3_set_mode(struct phy *phy, enum phy_mode mode) +{ + struct phy_meson_gxl_usb3_priv *priv = phy_get_drvdata(phy); + + switch (mode) { + case PHY_MODE_USB_HOST: + regmap_update_bits(priv->regmap, USB_R0, USB_R0_U2D_ACT, 0); + regmap_update_bits(priv->regmap, USB_R4, USB_R4_P21_SLEEP_M0, + 0); + break; + + case PHY_MODE_USB_DEVICE: + regmap_update_bits(priv->regmap, USB_R0, USB_R0_U2D_ACT, + USB_R0_U2D_ACT); + regmap_update_bits(priv->regmap, USB_R4, USB_R4_P21_SLEEP_M0, + USB_R4_P21_SLEEP_M0); + break; + + default: + dev_err(&phy->dev, "unsupported PHY mode %d\n", mode); + return -EINVAL; + } + + priv->mode = mode; + + return 0; +} + +static int phy_meson_gxl_usb3_init(struct phy *phy) +{ + struct phy_meson_gxl_usb3_priv *priv = phy_get_drvdata(phy); + int ret; + + ret = reset_control_reset(priv->reset); + if (ret) + goto err; + + ret = clk_prepare_enable(priv->clk_phy); + if (ret) + goto err; + + ret = clk_prepare_enable(priv->clk_peripheral); + if (ret) + goto err_disable_clk_phy; + + ret = phy_meson_gxl_usb3_set_mode(phy, priv->mode); + if (ret) + goto err_disable_clk_peripheral; + + regmap_update_bits(priv->regmap, USB_R1, + USB_R1_U3H_FLADJ_30MHZ_REG_MASK, + FIELD_PREP(USB_R1_U3H_FLADJ_30MHZ_REG_MASK, 0x20)); + + return 0; + +err_disable_clk_peripheral: + clk_disable_unprepare(priv->clk_peripheral); +err_disable_clk_phy: + clk_disable_unprepare(priv->clk_phy); +err: + return ret; +} + +static int phy_meson_gxl_usb3_exit(struct phy *phy) +{ + struct phy_meson_gxl_usb3_priv *priv = phy_get_drvdata(phy); + + clk_disable_unprepare(priv->clk_peripheral); + clk_disable_unprepare(priv->clk_phy); + + return 0; +} + +static const struct phy_ops phy_meson_gxl_usb3_ops = { + .power_on = phy_meson_gxl_usb3_power_on, + .power_off = phy_meson_gxl_usb3_power_off, + .set_mode = phy_meson_gxl_usb3_set_mode, + .init = phy_meson_gxl_usb3_init, + .exit = phy_meson_gxl_usb3_exit, + .owner = THIS_MODULE, +}; + +static int phy_meson_gxl_usb3_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct phy_meson_gxl_usb3_priv *priv; + struct resource *res; + struct phy *phy; + struct phy_provider *phy_provider; + void __iomem *base; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + priv->regmap = devm_regmap_init_mmio(dev, base, + &phy_meson_gxl_usb3_regmap_conf); + if (IS_ERR(priv->regmap)) + return PTR_ERR(priv->regmap); + + priv->clk_phy = devm_clk_get(dev, "phy"); + if (IS_ERR(priv->clk_phy)) + return PTR_ERR(priv->clk_phy); + + priv->clk_peripheral = devm_clk_get(dev, "peripheral"); + if (IS_ERR(priv->clk_peripheral)) + return PTR_ERR(priv->clk_peripheral); + + priv->reset = devm_reset_control_array_get_shared(dev); + if (IS_ERR(priv->reset)) + return PTR_ERR(priv->reset); + + /* + * default to host mode as hardware defaults and/or boot-loader + * behavior can result in this PHY starting up in device mode. this + * default and the initialization in phy_meson_gxl_usb3_init ensure + * that we reproducibly start in a known mode on all devices. + */ + priv->mode = PHY_MODE_USB_HOST; + + phy = devm_phy_create(dev, np, &phy_meson_gxl_usb3_ops); + if (IS_ERR(phy)) { + ret = PTR_ERR(phy); + if (ret != -EPROBE_DEFER) + dev_err(dev, "failed to create PHY\n"); + + return ret; + } + + phy_set_drvdata(phy, priv); + + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + + return PTR_ERR_OR_ZERO(phy_provider); +} + +static const struct of_device_id phy_meson_gxl_usb3_of_match[] = { + { .compatible = "amlogic,meson-gxl-usb3-phy", }, + { }, +}; +MODULE_DEVICE_TABLE(of, phy_meson_gxl_usb3_of_match); + +static struct platform_driver phy_meson_gxl_usb3_driver = { + .probe = phy_meson_gxl_usb3_probe, + .driver = { + .name = "phy-meson-gxl-usb3", + .of_match_table = phy_meson_gxl_usb3_of_match, + }, +}; +module_platform_driver(phy_meson_gxl_usb3_driver); + +MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>"); +MODULE_DESCRIPTION("Meson GXL USB3 PHY and OTG detection driver"); +MODULE_LICENSE("GPL v2"); |