This adds a new driver for the USB3 PHY found on Meson GXL and GXM SoCs (both SoCs are using the same USB PHY register layout). Unfortunately there is no documentation for this PHY in the public S905X datasheet (published for example by Khadas). What we know so far about this PHY: - even though the Meson GXL and GXM SoCs do not expose an USB3 port (the dwc3 controller only has USB2 ports enabled) we need to initialize the USB3 PHY (specifically USB_R1_U3H_FLADJ_30MHZ_REG_MASK). Without this initialization high-speed USB devices (especially USB hard disks and thumb drives, slower devices like mice do not seem to be affected) - it is responsible for the OTG detection and for switching the first USB2 PHY between host and peripheral (aka device) mode. an interrupt can be used to detect changes between host and device mode. The whole OTG detection logic is currently not implemented. Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx> --- drivers/phy/amlogic/Kconfig | 12 +++ drivers/phy/amlogic/Makefile | 1 + drivers/phy/amlogic/phy-meson-gxl-usb3.c | 177 +++++++++++++++++++++++++++++++ 3 files changed, 190 insertions(+) create mode 100644 drivers/phy/amlogic/phy-meson-gxl-usb3.c diff --git a/drivers/phy/amlogic/Kconfig b/drivers/phy/amlogic/Kconfig index cb8f4501652b..2f690d24203a 100644 --- a/drivers/phy/amlogic/Kconfig +++ b/drivers/phy/amlogic/Kconfig @@ -25,3 +25,15 @@ 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..8cbe2a4ab7e7 --- /dev/null +++ b/drivers/phy/amlogic/phy-meson-gxl-usb3.c @@ -0,0 +1,177 @@ +/* + * Meson GXL USB3 PHY and OTG mode detection driver + * + * Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/bitfield.h> +#include <linux/clk.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/regmap.h> +#include <linux/phy/phy.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) + +#define RESET_COMPLETE_TIME 500 + +struct phy_meson_gxl_usb3_priv { + struct regmap *regmap; +}; + +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_R1, + USB_R1_U3H_FLADJ_30MHZ_REG_MASK, + FIELD_PREP(USB_R1_U3H_FLADJ_30MHZ_REG_MASK, 0x20)); + + 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 const struct phy_ops phy_meson_gxl_usb3_ops = { + .power_on = phy_meson_gxl_usb3_power_on, + .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; + + 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); + + phy = devm_phy_create(dev, np, &phy_meson_gxl_usb3_ops); + if (IS_ERR(phy)) { + dev_err(dev, "failed to create PHY\n"); + return PTR_ERR(phy); + } + + 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@xxxxxxxxxxxxxx>"); +MODULE_DESCRIPTION("Meson GXL USB3 PHY and OTG detection driver"); +MODULE_LICENSE("GPL v2"); -- 2.14.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
