diff options
author | Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> | 2017-05-29 13:42:15 +0300 |
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committer | Kishon Vijay Abraham I <kishon@ti.com> | 2017-06-07 15:25:13 +0300 |
commit | 7c7356bab8e85c8d2e335752dcb89d94fe10d660 (patch) | |
tree | b0f88488908abbb78e85258c8e4963dfc54e19de | |
parent | b59b1d390483e3ff3342d7b7cd0ec19e847a6142 (diff) | |
download | linux-7c7356bab8e85c8d2e335752dcb89d94fe10d660.tar.xz |
phy: rcar-gen3-usb3: add support for R-Car Gen3 USB 3.0 PHY
The USB 3.0 PHY modules of R-Car Gen3 SoCs have:
- Spread spectrum clock (ssc).
- Using USB 2.0 EXTAL clock instead of USB 3.0 clock.
- Enabling VBUS detection for usb3.0 peripheral.
So, this driver supports these features.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
-rw-r--r-- | Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb3.txt | 46 | ||||
-rw-r--r-- | MAINTAINERS | 4 | ||||
-rw-r--r-- | drivers/phy/renesas/Kconfig | 7 | ||||
-rw-r--r-- | drivers/phy/renesas/Makefile | 1 | ||||
-rw-r--r-- | drivers/phy/renesas/phy-rcar-gen3-usb3.c | 226 |
5 files changed, 282 insertions, 2 deletions
diff --git a/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb3.txt b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb3.txt new file mode 100644 index 000000000000..f94cea48f6b1 --- /dev/null +++ b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb3.txt @@ -0,0 +1,46 @@ +* Renesas R-Car generation 3 USB 3.0 PHY + +This file provides information on what the device node for the R-Car generation +3 USB 3.0 PHY contains. +If you want to enable spread spectrum clock (ssc), you should use USB_EXTAL +instead of USB3_CLK. However, if you don't want to these features, you don't +need this driver. + +Required properties: +- compatible: "renesas,r8a7795-usb3-phy" if the device is a part of an R8A7795 + SoC. + "renesas,r8a7796-usb3-phy" if the device is a part of an R8A7796 + SoC. + "renesas,rcar-gen3-usb3-phy" for a generic R-Car Gen3 compatible + device. + + When compatible with the generic version, nodes must list the + SoC-specific version corresponding to the platform first + followed by the generic version. + +- reg: offset and length of the USB 3.0 PHY register block. +- clocks: A list of phandles and clock-specifier pairs. +- clock-names: Name of the clocks. + - The funcional clock must be "usb3-if". + - The usb3's external clock must be "usb3s_clk". + - The usb2's external clock must be "usb_extal". If you want to use the ssc, + the clock-frequency must not be 0. +- #phy-cells: see phy-bindings.txt in the same directory, must be <0>. + +Optional properties: +- renesas,ssc-range: Enable/disable spread spectrum clock (ssc) by using + the following values as u32: + - 0 (or the property doesn't exist): disable the ssc + - 4980: enable the ssc as -4980 ppm + - 4492: enable the ssc as -4492 ppm + - 4003: enable the ssc as -4003 ppm + +Example (R-Car H3): + + usb-phy@e65ee000 { + compatible = "renesas,r8a7795-usb3-phy", + "renesas,rcar-gen3-usb3-phy"; + reg = <0 0xe65ee000 0 0x90>; + clocks = <&cpg CPG_MOD 328>, <&usb3s0_clk>, <&usb_extal>; + clock-names = "usb3-if", "usb3s_clk", "usb_extal"; + }; diff --git a/MAINTAINERS b/MAINTAINERS index a47d3da4d35d..d711d53aecf4 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -10829,11 +10829,11 @@ L: linux-iio@vger.kernel.org S: Supported F: drivers/iio/adc/rcar_gyro_adc.c -RENESAS USB2 PHY DRIVER +RENESAS USB PHY DRIVER M: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> L: linux-renesas-soc@vger.kernel.org S: Maintained -F: drivers/phy/renesas/phy-rcar-gen3-usb2.c +F: drivers/phy/renesas/phy-rcar-gen3-usb*.c RESET CONTROLLER FRAMEWORK M: Philipp Zabel <p.zabel@pengutronix.de> diff --git a/drivers/phy/renesas/Kconfig b/drivers/phy/renesas/Kconfig index 432e2715e9c4..cb09245e9b4c 100644 --- a/drivers/phy/renesas/Kconfig +++ b/drivers/phy/renesas/Kconfig @@ -15,3 +15,10 @@ config PHY_RCAR_GEN3_USB2 select GENERIC_PHY help Support for USB 2.0 PHY found on Renesas R-Car generation 3 SoCs. + +config PHY_RCAR_GEN3_USB3 + tristate "Renesas R-Car generation 3 USB 3.0 PHY driver" + depends on ARCH_RENESAS || COMPILE_TEST + select GENERIC_PHY + help + Support for USB 3.0 PHY found on Renesas R-Car generation 3 SoCs. diff --git a/drivers/phy/renesas/Makefile b/drivers/phy/renesas/Makefile index 695241aebf69..8b6025916a93 100644 --- a/drivers/phy/renesas/Makefile +++ b/drivers/phy/renesas/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_PHY_RCAR_GEN2) += phy-rcar-gen2.o obj-$(CONFIG_PHY_RCAR_GEN3_USB2) += phy-rcar-gen3-usb2.o +obj-$(CONFIG_PHY_RCAR_GEN3_USB3) += phy-rcar-gen3-usb3.o diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb3.c b/drivers/phy/renesas/phy-rcar-gen3-usb3.c new file mode 100644 index 000000000000..88c83c9b8ff9 --- /dev/null +++ b/drivers/phy/renesas/phy-rcar-gen3-usb3.c @@ -0,0 +1,226 @@ +/* + * Renesas R-Car Gen3 for USB3.0 PHY driver + * + * Copyright (C) 2017 Renesas Electronics Corporation + * + * 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 <linux/clk.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> + +#define USB30_CLKSET0 0x034 +#define USB30_CLKSET1 0x036 +#define USB30_SSC_SET 0x038 +#define USB30_PHY_ENABLE 0x060 +#define USB30_VBUS_EN 0x064 + +/* USB30_CLKSET0 */ +#define CLKSET0_PRIVATE 0x05c0 +#define CLKSET0_USB30_FSEL_USB_EXTAL 0x0002 + +/* USB30_CLKSET1 */ +#define CLKSET1_USB30_PLL_MULTI_SHIFT 6 +#define CLKSET1_USB30_PLL_MULTI_USB_EXTAL (0x64 << \ + CLKSET1_USB30_PLL_MULTI_SHIFT) +#define CLKSET1_PHYRESET BIT(4) /* 1: reset */ +#define CLKSET1_REF_CLKDIV BIT(3) /* 1: USB_EXTAL */ +#define CLKSET1_PRIVATE_2_1 BIT(1) /* Write B'01 */ +#define CLKSET1_REF_CLK_SEL BIT(0) /* 1: USB3S0_CLK_P */ + +/* USB30_SSC_SET */ +#define SSC_SET_SSC_EN BIT(12) +#define SSC_SET_RANGE_SHIFT 9 +#define SSC_SET_RANGE_4980 (0x0 << SSC_SET_RANGE_SHIFT) +#define SSC_SET_RANGE_4492 (0x1 << SSC_SET_RANGE_SHIFT) +#define SSC_SET_RANGE_4003 (0x2 << SSC_SET_RANGE_SHIFT) + +/* USB30_PHY_ENABLE */ +#define PHY_ENABLE_RESET_EN BIT(4) + +/* USB30_VBUS_EN */ +#define VBUS_EN_VBUS_EN BIT(1) + +struct rcar_gen3_usb3 { + void __iomem *base; + struct phy *phy; + u32 ssc_range; + bool usb3s_clk; + bool usb_extal; +}; + +static void write_clkset1_for_usb_extal(struct rcar_gen3_usb3 *r, bool reset) +{ + u16 val = CLKSET1_USB30_PLL_MULTI_USB_EXTAL | + CLKSET1_REF_CLKDIV | CLKSET1_PRIVATE_2_1; + + if (reset) + val |= CLKSET1_PHYRESET; + + writew(val, r->base + USB30_CLKSET1); +} + +static void rcar_gen3_phy_usb3_enable_ssc(struct rcar_gen3_usb3 *r) +{ + u16 val = SSC_SET_SSC_EN; + + switch (r->ssc_range) { + case 4980: + val |= SSC_SET_RANGE_4980; + break; + case 4492: + val |= SSC_SET_RANGE_4492; + break; + case 4003: + val |= SSC_SET_RANGE_4003; + break; + default: + dev_err(&r->phy->dev, "%s: unsupported range (%x)\n", __func__, + r->ssc_range); + return; + } + + writew(val, r->base + USB30_SSC_SET); +} + +static void rcar_gen3_phy_usb3_select_usb_extal(struct rcar_gen3_usb3 *r) +{ + write_clkset1_for_usb_extal(r, false); + if (r->ssc_range) + rcar_gen3_phy_usb3_enable_ssc(r); + writew(CLKSET0_PRIVATE | CLKSET0_USB30_FSEL_USB_EXTAL, + r->base + USB30_CLKSET0); + writew(PHY_ENABLE_RESET_EN, r->base + USB30_PHY_ENABLE); + write_clkset1_for_usb_extal(r, true); + usleep_range(10, 20); + write_clkset1_for_usb_extal(r, false); +} + +static int rcar_gen3_phy_usb3_init(struct phy *p) +{ + struct rcar_gen3_usb3 *r = phy_get_drvdata(p); + + dev_vdbg(&r->phy->dev, "%s: enter (%d, %d, %d)\n", __func__, + r->usb3s_clk, r->usb_extal, r->ssc_range); + + if (!r->usb3s_clk && r->usb_extal) + rcar_gen3_phy_usb3_select_usb_extal(r); + + /* Enables VBUS detection anyway */ + writew(VBUS_EN_VBUS_EN, r->base + USB30_VBUS_EN); + + return 0; +} + +static const struct phy_ops rcar_gen3_phy_usb3_ops = { + .init = rcar_gen3_phy_usb3_init, + .owner = THIS_MODULE, +}; + +static const struct of_device_id rcar_gen3_phy_usb3_match_table[] = { + { .compatible = "renesas,rcar-gen3-usb3-phy" }, + { } +}; +MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb3_match_table); + +static int rcar_gen3_phy_usb3_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct rcar_gen3_usb3 *r; + struct phy_provider *provider; + struct resource *res; + int ret = 0; + struct clk *clk; + + if (!dev->of_node) { + dev_err(dev, "This driver needs device tree\n"); + return -EINVAL; + } + + r = devm_kzalloc(dev, sizeof(*r), GFP_KERNEL); + if (!r) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + r->base = devm_ioremap_resource(dev, res); + if (IS_ERR(r->base)) + return PTR_ERR(r->base); + + clk = devm_clk_get(dev, "usb3s_clk"); + if (!IS_ERR(clk) && !clk_prepare_enable(clk)) { + r->usb3s_clk = !!clk_get_rate(clk); + clk_disable_unprepare(clk); + } + clk = devm_clk_get(dev, "usb_extal"); + if (!IS_ERR(clk) && !clk_prepare_enable(clk)) { + r->usb_extal = !!clk_get_rate(clk); + clk_disable_unprepare(clk); + } + + if (!r->usb3s_clk && !r->usb_extal) { + dev_err(dev, "This driver needs usb3s_clk and/or usb_extal\n"); + ret = -EINVAL; + goto error; + } + + /* + * devm_phy_create() will call pm_runtime_enable(&phy->dev); + * And then, phy-core will manage runtime pm for this device. + */ + pm_runtime_enable(dev); + + r->phy = devm_phy_create(dev, NULL, &rcar_gen3_phy_usb3_ops); + if (IS_ERR(r->phy)) { + dev_err(dev, "Failed to create USB3 PHY\n"); + ret = PTR_ERR(r->phy); + goto error; + } + + of_property_read_u32(dev->of_node, "renesas,ssc-range", &r->ssc_range); + + platform_set_drvdata(pdev, r); + phy_set_drvdata(r->phy, r); + + provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + if (IS_ERR(provider)) { + dev_err(dev, "Failed to register PHY provider\n"); + ret = PTR_ERR(provider); + goto error; + } + + return 0; + +error: + pm_runtime_disable(dev); + + return ret; +} + +static int rcar_gen3_phy_usb3_remove(struct platform_device *pdev) +{ + pm_runtime_disable(&pdev->dev); + + return 0; +}; + +static struct platform_driver rcar_gen3_phy_usb3_driver = { + .driver = { + .name = "phy_rcar_gen3_usb3", + .of_match_table = rcar_gen3_phy_usb3_match_table, + }, + .probe = rcar_gen3_phy_usb3_probe, + .remove = rcar_gen3_phy_usb3_remove, +}; +module_platform_driver(rcar_gen3_phy_usb3_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 3.0 PHY"); +MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>"); |