From: lyz <l...@rock-chips.com> Add a driver for the Rockchip SoC internal USB2.0 PHY. This driver currently support RK3288.
Signed-off-by: lyz <l...@rock-chips.com> --- .../devicetree/bindings/phy/rockchip-usb-phy.txt | 17 ++ drivers/phy/Kconfig | 7 + drivers/phy/Makefile | 1 + drivers/phy/phy-rockchip-usb.c | 179 +++++++++++++++++++++ 4 files changed, 204 insertions(+) create mode 100644 Documentation/devicetree/bindings/phy/rockchip-usb-phy.txt create mode 100644 drivers/phy/phy-rockchip-usb.c diff --git a/Documentation/devicetree/bindings/phy/rockchip-usb-phy.txt b/Documentation/devicetree/bindings/phy/rockchip-usb-phy.txt new file mode 100644 index 0000000..18ccc2f --- /dev/null +++ b/Documentation/devicetree/bindings/phy/rockchip-usb-phy.txt @@ -0,0 +1,17 @@ +ROCKCHIP USB2 PHY + +Required properties: + - compatible: rockchip,rk3288-usb-phy + - rockchip,grf : phandle to the syscon managing the "general + register files" + - #phy-cells: must be 1 +Refer to phy/phy-bindings.txt for the generic PHY binding +properties + +Example: + + usbphy: phy { + #phy-cells = <1>; + compatible = "rockchip,rk3288-usb-phy"; + rockchip,grf = <&grf>; + }; diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index 2a436e6..54ab088 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -218,6 +218,13 @@ config PHY_QCOM_IPQ806X_SATA depends on OF select GENERIC_PHY +config PHY_ROCKCHIP_RK3288_USB2 + tristate "Rockchip USB2 RK3288 PHY Driver" + depends on ARCH_ROCKCHIP && OF + select GENERIC_PHY + help + Enable this to support the Rockchip USB 2.0 PHY. + config PHY_ST_SPEAR1310_MIPHY tristate "ST SPEAR1310-MIPHY driver" select GENERIC_PHY diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index c4590fc..f4f2f79 100644 --- a/drivers/phy/Makefile +++ b/drivers/phy/Makefile @@ -25,6 +25,7 @@ phy-exynos-usb2-$(CONFIG_PHY_EXYNOS5250_USB2) += phy-exynos5250-usb2.o phy-exynos-usb2-$(CONFIG_PHY_S5PV210_USB2) += phy-s5pv210-usb2.o obj-$(CONFIG_PHY_EXYNOS5_USBDRD) += phy-exynos5-usbdrd.o obj-$(CONFIG_PHY_QCOM_APQ8064_SATA) += phy-qcom-apq8064-sata.o +obj-$(CONFIG_PHY_ROCKCHIP_RK3288_USB2) += phy-rockchip-usb.o obj-$(CONFIG_PHY_QCOM_IPQ806X_SATA) += phy-qcom-ipq806x-sata.o obj-$(CONFIG_PHY_ST_SPEAR1310_MIPHY) += phy-spear1310-miphy.o obj-$(CONFIG_PHY_ST_SPEAR1340_MIPHY) += phy-spear1340-miphy.o diff --git a/drivers/phy/phy-rockchip-usb.c b/drivers/phy/phy-rockchip-usb.c new file mode 100644 index 0000000..2586b76 --- /dev/null +++ b/drivers/phy/phy-rockchip-usb.c @@ -0,0 +1,179 @@ +/* + * Rockchip usb PHY driver + * + * Copyright (C) 2014 Roy Li <l...@rock-chips.com> + * Copyright (C) 2014 ROCKCHIP, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/regulator/consumer.h> +#include <linux/reset.h> +#include <linux/regmap.h> +#include <linux/mfd/syscon.h> + +#define ROCKCHIP_RK3288_UOC(n) (0x320 + n * 0x14) + +#define SIDDQ_MSK (1 << (13 + 16)) +#define SIDDQ_ON (1 << 13) +#define SIDDQ_OFF (0 << 13) + +enum rk3288_phy_id { + RK3288_OTG, + RK3288_HOST0, + RK3288_HOST1, + RK3288_NUM_PHYS, +}; + +struct rockchip_usb_phy { + struct regmap *reg_base; + unsigned int reg_offset; + struct clk *clk; + struct phy *phy; +}; + +static int rockchip_usb_phy_power(struct rockchip_usb_phy *phy, + bool siddq) +{ + return regmap_write(phy->reg_base, phy->reg_offset, + SIDDQ_MSK | (siddq ? SIDDQ_ON : SIDDQ_OFF)); +} + +static int rockchip_usb_phy_power_off(struct phy *_phy) +{ + struct rockchip_usb_phy *phy = phy_get_drvdata(_phy); + int ret = 0; + + /* Power down usb phy analog blocks by set siddq 1*/ + ret = rockchip_usb_phy_power(phy, 1); + if (ret) + return ret; + + clk_disable_unprepare(phy->clk); + if (ret) + return ret; + + return 0; +} + +static int rockchip_usb_phy_power_on(struct phy *_phy) +{ + struct rockchip_usb_phy *phy = phy_get_drvdata(_phy); + int ret = 0; + + ret = clk_prepare_enable(phy->clk); + if (ret) + return ret; + + /* Power up usb phy analog blocks by set siddq 0*/ + ret = rockchip_usb_phy_power(phy, 0); + if (ret) + return ret; + + return 0; +} + +static struct phy *rockchip_usb_phy_xlate(struct device *dev, + struct of_phandle_args *args) +{ + struct rockchip_usb_phy *phy_array = dev_get_drvdata(dev); + + if (WARN_ON(args->args[0] == 0 || args->args[0] >= RK3288_NUM_PHYS)) + return ERR_PTR(-ENODEV); + + return (phy_array + args->args[0])->phy; +} + +static struct phy_ops ops = { + .power_on = rockchip_usb_phy_power_on, + .power_off = rockchip_usb_phy_power_off, + .owner = THIS_MODULE, +}; + +static int rockchip_usb_phy_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct rockchip_usb_phy *rk_phy; + struct rockchip_usb_phy *phy_array; + struct phy_provider *phy_provider; + struct regmap *grf; + char clk_name[16]; + int i; + + grf = syscon_regmap_lookup_by_phandle(dev->of_node, "rockchip,grf"); + if (IS_ERR(grf)) { + dev_err(&pdev->dev, "Missing rockchip,grf property\n"); + return PTR_ERR(grf); + } + + phy_array = devm_kzalloc(dev, RK3288_NUM_PHYS * sizeof(*rk_phy), + GFP_KERNEL); + if (!phy_array) + return -ENOMEM; + + for (i = 0; i < RK3288_NUM_PHYS; i++) { + rk_phy = &phy_array[i]; + + rk_phy->reg_base = grf; + + rk_phy->reg_offset = ROCKCHIP_RK3288_UOC(i); + + snprintf(clk_name, sizeof(clk_name), "usbphy%d", i); + rk_phy->clk = devm_clk_get(dev, clk_name); + if (IS_ERR(rk_phy->clk)) { + dev_warn(dev, "failed to get clock %s\n", clk_name); + rk_phy->clk = NULL; + } + + rk_phy->phy = devm_phy_create(dev, NULL, &ops, NULL); + if (IS_ERR(rk_phy->phy)) { + dev_err(dev, "failed to create PHY %d\n", i); + return PTR_ERR(rk_phy->phy); + } + phy_set_drvdata(rk_phy->phy, rk_phy); + } + + platform_set_drvdata(pdev, phy_array); + + phy_provider = devm_of_phy_provider_register(dev, + rockchip_usb_phy_xlate); + return PTR_ERR_OR_ZERO(phy_provider); +} + +static const struct of_device_id rockchip_usb_phy_dt_ids[] = { + { .compatible = "rockchip,rk3288-usb-phy" }, + {} +}; + +MODULE_DEVICE_TABLE(of, rockchip_usb_phy_dt_ids); + +static struct platform_driver rockchip_usb_driver = { + .probe = rockchip_usb_phy_probe, + .driver = { + .name = "rockchip-usb-phy", + .owner = THIS_MODULE, + .of_match_table = rockchip_usb_phy_dt_ids, + }, +}; + +module_platform_driver(rockchip_usb_driver); + +MODULE_AUTHOR("Roy Li <l...@rock-chips.com>"); +MODULE_DESCRIPTION("Rockchip USB 2.0 PHY driver"); +MODULE_LICENSE("GPL v2"); -- 2.0.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/