From e2427b09ba929c2b9d02556b74a85161a7364792 Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Wed, 25 Jan 2017 14:32:45 -0800 Subject: [PATCH] phy: Add support for Qualcomm's USB HS phy The high-speed phy on qcom SoCs is controlled via the ULPI viewport. Cc: Kishon Vijay Abraham I Cc: Acked-by: Rob Herring Signed-off-by: Stephen Boyd Signed-off-by: Kishon Vijay Abraham I --- .../bindings/phy/qcom,usb-hs-phy.txt | 84 +++++ drivers/phy/Kconfig | 8 + drivers/phy/Makefile | 1 + drivers/phy/phy-qcom-usb-hs.c | 296 ++++++++++++++++++ 4 files changed, 389 insertions(+) create mode 100644 Documentation/devicetree/bindings/phy/qcom,usb-hs-phy.txt create mode 100644 drivers/phy/phy-qcom-usb-hs.c diff --git a/Documentation/devicetree/bindings/phy/qcom,usb-hs-phy.txt b/Documentation/devicetree/bindings/phy/qcom,usb-hs-phy.txt new file mode 100644 index 000000000000..b3b75c1e6285 --- /dev/null +++ b/Documentation/devicetree/bindings/phy/qcom,usb-hs-phy.txt @@ -0,0 +1,84 @@ +Qualcomm's USB HS PHY + +PROPERTIES + +- compatible: + Usage: required + Value type: + Definition: Should contain "qcom,usb-hs-phy" and more specifically one of the + following: + + "qcom,usb-hs-phy-apq8064" + "qcom,usb-hs-phy-msm8916" + "qcom,usb-hs-phy-msm8974" + +- #phy-cells: + Usage: required + Value type: + Definition: Should contain 0 + +- clocks: + Usage: required + Value type: + Definition: Should contain clock specifier for the reference and sleep + clocks + +- clock-names: + Usage: required + Value type: + Definition: Should contain "ref" and "sleep" for the reference and sleep + clocks respectively + +- resets: + Usage: required + Value type: + Definition: Should contain the phy and POR resets + +- reset-names: + Usage: required + Value type: + Definition: Should contain "phy" and "por" for the phy and POR resets + respectively + +- v3p3-supply: + Usage: required + Value type: + Definition: Should contain a reference to the 3.3V supply + +- v1p8-supply: + Usage: required + Value type: + Definition: Should contain a reference to the 1.8V supply + +- extcon: + Usage: optional + Value type: + Definition: Should contain the vbus extcon + +- qcom,init-seq: + Usage: optional + Value type: + Definition: Should contain a sequence of ULPI address and value pairs to + program into the ULPI_EXT_VENDOR_SPECIFIC area. This is related + to Device Mode Eye Diagram test. The addresses are offsets + from the ULPI_EXT_VENDOR_SPECIFIC address, for example, + <0x1 0x53> would mean "write the value 0x53 to address 0x81". + +EXAMPLE + +otg: usb-controller { + ulpi { + phy { + compatible = "qcom,usb-hs-phy-msm8974", "qcom,usb-hs-phy"; + #phy-cells = <0>; + clocks = <&xo_board>, <&gcc GCC_USB2A_PHY_SLEEP_CLK>; + clock-names = "ref", "sleep"; + resets = <&gcc GCC_USB2A_PHY_BCR>, <&otg 0>; + reset-names = "phy", "por"; + v3p3-supply = <&pm8941_l24>; + v1p8-supply = <&pm8941_l6>; + extcon = <&smbb>; + qcom,init-seq = /bits/ 8 <0x1 0x63>; + }; + }; +}; diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index a430a64981d5..61a22e985831 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -437,6 +437,14 @@ config PHY_QCOM_UFS help Support for UFS PHY on QCOM chipsets. +config PHY_QCOM_USB_HS + tristate "Qualcomm USB HS PHY module" + depends on USB_ULPI_BUS + select GENERIC_PHY + help + Support for the USB high-speed ULPI compliant phy on Qualcomm + chipsets. + config PHY_QCOM_USB_HSIC tristate "Qualcomm USB HSIC ULPI PHY module" depends on USB_ULPI_BUS diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index c43c9df5d301..0e4259473d28 100644 --- a/drivers/phy/Makefile +++ b/drivers/phy/Makefile @@ -52,6 +52,7 @@ obj-$(CONFIG_PHY_STIH407_USB) += phy-stih407-usb.o obj-$(CONFIG_PHY_QCOM_UFS) += phy-qcom-ufs.o obj-$(CONFIG_PHY_QCOM_UFS) += phy-qcom-ufs-qmp-20nm.o obj-$(CONFIG_PHY_QCOM_UFS) += phy-qcom-ufs-qmp-14nm.o +obj-$(CONFIG_PHY_QCOM_USB_HS) += phy-qcom-usb-hs.o obj-$(CONFIG_PHY_QCOM_USB_HSIC) += phy-qcom-usb-hsic.o obj-$(CONFIG_PHY_TUSB1210) += phy-tusb1210.o obj-$(CONFIG_PHY_BRCM_SATA) += phy-brcm-sata.o diff --git a/drivers/phy/phy-qcom-usb-hs.c b/drivers/phy/phy-qcom-usb-hs.c new file mode 100644 index 000000000000..94dfbfd739c3 --- /dev/null +++ b/drivers/phy/phy-qcom-usb-hs.c @@ -0,0 +1,296 @@ +/** + * Copyright (C) 2016 Linaro Ltd + * + * 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. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "ulpi_phy.h" + +#define ULPI_PWR_CLK_MNG_REG 0x88 +# define ULPI_PWR_OTG_COMP_DISABLE BIT(0) + +#define ULPI_MISC_A 0x96 +# define ULPI_MISC_A_VBUSVLDEXTSEL BIT(1) +# define ULPI_MISC_A_VBUSVLDEXT BIT(0) + + +struct ulpi_seq { + u8 addr; + u8 val; +}; + +struct qcom_usb_hs_phy { + struct ulpi *ulpi; + struct phy *phy; + struct clk *ref_clk; + struct clk *sleep_clk; + struct regulator *v1p8; + struct regulator *v3p3; + struct reset_control *reset; + struct ulpi_seq *init_seq; + struct extcon_dev *vbus_edev; + struct notifier_block vbus_notify; +}; + +static int qcom_usb_hs_phy_set_mode(struct phy *phy, enum phy_mode mode) +{ + struct qcom_usb_hs_phy *uphy = phy_get_drvdata(phy); + u8 addr; + int ret; + + if (!uphy->vbus_edev) { + u8 val = 0; + + switch (mode) { + case PHY_MODE_USB_OTG: + case PHY_MODE_USB_HOST: + val |= ULPI_INT_IDGRD; + case PHY_MODE_USB_DEVICE: + val |= ULPI_INT_SESS_VALID; + default: + break; + } + + ret = ulpi_write(uphy->ulpi, ULPI_USB_INT_EN_RISE, val); + if (ret) + return ret; + ret = ulpi_write(uphy->ulpi, ULPI_USB_INT_EN_FALL, val); + } else { + switch (mode) { + case PHY_MODE_USB_OTG: + case PHY_MODE_USB_DEVICE: + addr = ULPI_SET(ULPI_MISC_A); + break; + case PHY_MODE_USB_HOST: + addr = ULPI_CLR(ULPI_MISC_A); + break; + default: + return -EINVAL; + } + + ret = ulpi_write(uphy->ulpi, ULPI_SET(ULPI_PWR_CLK_MNG_REG), + ULPI_PWR_OTG_COMP_DISABLE); + if (ret) + return ret; + ret = ulpi_write(uphy->ulpi, addr, ULPI_MISC_A_VBUSVLDEXTSEL); + } + + return ret; +} + +static int +qcom_usb_hs_phy_vbus_notifier(struct notifier_block *nb, unsigned long event, + void *ptr) +{ + struct qcom_usb_hs_phy *uphy; + u8 addr; + + uphy = container_of(nb, struct qcom_usb_hs_phy, vbus_notify); + + if (event) + addr = ULPI_SET(ULPI_MISC_A); + else + addr = ULPI_CLR(ULPI_MISC_A); + + return ulpi_write(uphy->ulpi, addr, ULPI_MISC_A_VBUSVLDEXT); +} + +static int qcom_usb_hs_phy_power_on(struct phy *phy) +{ + struct qcom_usb_hs_phy *uphy = phy_get_drvdata(phy); + struct ulpi *ulpi = uphy->ulpi; + const struct ulpi_seq *seq; + int ret, state; + + ret = clk_prepare_enable(uphy->ref_clk); + if (ret) + return ret; + + ret = clk_prepare_enable(uphy->sleep_clk); + if (ret) + goto err_sleep; + + ret = regulator_set_load(uphy->v1p8, 50000); + if (ret < 0) + goto err_1p8; + + ret = regulator_enable(uphy->v1p8); + if (ret) + goto err_1p8; + + ret = regulator_set_voltage_triplet(uphy->v3p3, 3050000, 3300000, + 3300000); + if (ret) + goto err_3p3; + + ret = regulator_set_load(uphy->v3p3, 50000); + if (ret < 0) + goto err_3p3; + + ret = regulator_enable(uphy->v3p3); + if (ret) + goto err_3p3; + + for (seq = uphy->init_seq; seq->addr; seq++) { + ret = ulpi_write(ulpi, ULPI_EXT_VENDOR_SPECIFIC + seq->addr, + seq->val); + if (ret) + goto err_ulpi; + } + + if (uphy->reset) { + ret = reset_control_reset(uphy->reset); + if (ret) + goto err_ulpi; + } + + if (uphy->vbus_edev) { + state = extcon_get_cable_state_(uphy->vbus_edev, EXTCON_USB); + /* setup initial state */ + qcom_usb_hs_phy_vbus_notifier(&uphy->vbus_notify, state, + uphy->vbus_edev); + ret = extcon_register_notifier(uphy->vbus_edev, EXTCON_USB, + &uphy->vbus_notify); + if (ret) + goto err_ulpi; + } + + return 0; +err_ulpi: + regulator_disable(uphy->v3p3); +err_3p3: + regulator_disable(uphy->v1p8); +err_1p8: + clk_disable_unprepare(uphy->sleep_clk); +err_sleep: + clk_disable_unprepare(uphy->ref_clk); + return ret; +} + +static int qcom_usb_hs_phy_power_off(struct phy *phy) +{ + int ret; + struct qcom_usb_hs_phy *uphy = phy_get_drvdata(phy); + + if (uphy->vbus_edev) { + ret = extcon_unregister_notifier(uphy->vbus_edev, EXTCON_USB, + &uphy->vbus_notify); + if (ret) + return ret; + } + + regulator_disable(uphy->v3p3); + regulator_disable(uphy->v1p8); + clk_disable_unprepare(uphy->sleep_clk); + clk_disable_unprepare(uphy->ref_clk); + + return 0; +} + +static const struct phy_ops qcom_usb_hs_phy_ops = { + .power_on = qcom_usb_hs_phy_power_on, + .power_off = qcom_usb_hs_phy_power_off, + .set_mode = qcom_usb_hs_phy_set_mode, + .owner = THIS_MODULE, +}; + +static int qcom_usb_hs_phy_probe(struct ulpi *ulpi) +{ + struct qcom_usb_hs_phy *uphy; + struct phy_provider *p; + struct clk *clk; + struct regulator *reg; + struct reset_control *reset; + int size; + int ret; + + uphy = devm_kzalloc(&ulpi->dev, sizeof(*uphy), GFP_KERNEL); + if (!uphy) + return -ENOMEM; + ulpi_set_drvdata(ulpi, uphy); + uphy->ulpi = ulpi; + + size = of_property_count_u8_elems(ulpi->dev.of_node, "qcom,init-seq"); + if (size < 0) + size = 0; + uphy->init_seq = devm_kmalloc_array(&ulpi->dev, (size / 2) + 1, + sizeof(*uphy->init_seq), GFP_KERNEL); + if (!uphy->init_seq) + return -ENOMEM; + ret = of_property_read_u8_array(ulpi->dev.of_node, "qcom,init-seq", + (u8 *)uphy->init_seq, size); + if (ret && size) + return ret; + /* NUL terminate */ + uphy->init_seq[size / 2].addr = uphy->init_seq[size / 2].val = 0; + + uphy->ref_clk = clk = devm_clk_get(&ulpi->dev, "ref"); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + uphy->sleep_clk = clk = devm_clk_get(&ulpi->dev, "sleep"); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + uphy->v1p8 = reg = devm_regulator_get(&ulpi->dev, "v1p8"); + if (IS_ERR(reg)) + return PTR_ERR(reg); + + uphy->v3p3 = reg = devm_regulator_get(&ulpi->dev, "v3p3"); + if (IS_ERR(reg)) + return PTR_ERR(reg); + + uphy->reset = reset = devm_reset_control_get(&ulpi->dev, "por"); + if (IS_ERR(reset)) { + if (PTR_ERR(reset) == -EPROBE_DEFER) + return PTR_ERR(reset); + uphy->reset = NULL; + } + + uphy->phy = devm_phy_create(&ulpi->dev, ulpi->dev.of_node, + &qcom_usb_hs_phy_ops); + if (IS_ERR(uphy->phy)) + return PTR_ERR(uphy->phy); + + uphy->vbus_edev = extcon_get_edev_by_phandle(&ulpi->dev, 0); + if (IS_ERR(uphy->vbus_edev)) { + if (PTR_ERR(uphy->vbus_edev) != -ENODEV) + return PTR_ERR(uphy->vbus_edev); + uphy->vbus_edev = NULL; + } + + uphy->vbus_notify.notifier_call = qcom_usb_hs_phy_vbus_notifier; + phy_set_drvdata(uphy->phy, uphy); + + p = devm_of_phy_provider_register(&ulpi->dev, of_phy_simple_xlate); + return PTR_ERR_OR_ZERO(p); +} + +static const struct of_device_id qcom_usb_hs_phy_match[] = { + { .compatible = "qcom,usb-hs-phy", }, + { } +}; +MODULE_DEVICE_TABLE(of, qcom_usb_hs_phy_match); + +static struct ulpi_driver qcom_usb_hs_phy_driver = { + .probe = qcom_usb_hs_phy_probe, + .driver = { + .name = "qcom_usb_hs_phy", + .of_match_table = qcom_usb_hs_phy_match, + }, +}; +module_ulpi_driver(qcom_usb_hs_phy_driver); + +MODULE_DESCRIPTION("Qualcomm USB HS phy"); +MODULE_LICENSE("GPL v2"); -- GitLab