The USB30PHY of a RCAR-Gen3 XHCI device can select the reference clock
source. The 2 available options are the differential input clock pair
supplied on pins USB3S0_CLK_P / USB3S0_CLK_M (default) and the on-chip
clock source supplied through USB_XTAL/USB_EXTAL.
The device can be configured to use the on-chip source by adding the
"renesas,use-on-chip-clk" option in the corresponding device tree node.
Signed-off-by: Petre Pircalabu <Petre_Pircalabu@xxxxxxxxxx>
---
.../devicetree/bindings/phy/rcar-gen3-phy-usb3.txt | 22 +++
arch/arm64/boot/dts/renesas/r8a7795-es1.dtsi | 8 +
arch/arm64/configs/defconfig | 1 +
drivers/phy/Kconfig | 8 +
drivers/phy/Makefile | 1 +
drivers/phy/phy-rcar-gen3-usb3.c | 166 +++++++++++++++++++++
6 files changed, 206 insertions(+)
create mode 100644 Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb3.txt
create mode 100644 drivers/phy/phy-rcar-gen3-usb3.c
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 0000000..aa9657c
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb3.txt
@@ -0,0 +1,22 @@
+* 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.
+
+Required properties:
+- compatible: "renesas,rcar-gen3-usb3-phy" for a generic R-Car Gen3 compatible device.
+- reg: offset and length of the partial USB 3.0 Host PHY register block.
+- #phy-cells: see phy-bindings.txt in the same directory, must be <0>.
+
+Optional properties:
+
+Example (R-Car H3):
+
+ usb3_phy0: usb-phy@e65ee000 {
+ compatible = "renesas,rcar-gen3-usb3-phy";
+ reg = <0 0xe65ee000 0 0x100>;
+ power-domains = <&sysc R8A7795_PD_ALWAYS_ON>;
+ #phy-cells = <0>;
+ renesas,use-on-chip-clk;
+ status = "okay";
+ };
diff --git a/arch/arm64/boot/dts/renesas/r8a7795-es1.dtsi b/arch/arm64/boot/dts/renesas/r8a7795-es1.dtsi
index 2bf5911..33fe114 100644
--- a/arch/arm64/boot/dts/renesas/r8a7795-es1.dtsi
+++ b/arch/arm64/boot/dts/renesas/r8a7795-es1.dtsi
@@ -2499,6 +2499,14 @@
status = "disabled";
};
+ usb3_phy0: usb-phy@e65ee000 {
+ compatible = "renesas,rcar-gen3-usb3-phy";
+ reg = <0 0xe65ee000 0 0x100>;
+ power-domains = <&sysc R8A7795_PD_ALWAYS_ON>;
+ #phy-cells = <0>;
+ status = "disabled";
+ };
+
ehci0: usb@ee080100 {
compatible = "generic-ehci";
reg = <0 0xee080100 0 0x100>;
diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 4e030c8..df9ca01 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -441,6 +441,7 @@ CONFIG_PWM=y
CONFIG_PWM_TEGRA=m
CONFIG_COMMON_RESET_HI6220=y
CONFIG_PHY_RCAR_GEN3_USB2=y
+CONFIG_PHY_RCAR_GEN3_USB3=y
CONFIG_PHY_HI6220_USB=y
CONFIG_PHY_XGENE=y
CONFIG_PHY_TEGRA_XUSB=y
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index fe00f91..4c8a207 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -154,6 +154,14 @@ config PHY_RCAR_GEN3_USB2
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
+ select GENERIC_PHY
+ help
+ Enable this to add support for the USB 3.0 PHY found on
+ Renesas R-Car generation 3 SoCs.
+
config OMAP_CONTROL_PHY
tristate "OMAP CONTROL PHY Driver"
depends on ARCH_OMAP2PLUS || COMPILE_TEST
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index a534cf5..aeda949 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -21,6 +21,7 @@ obj-$(CONFIG_PHY_MIPHY28LP) += phy-miphy28lp.o
obj-$(CONFIG_PHY_MIPHY365X) += phy-miphy365x.o
obj-$(CONFIG_PHY_RCAR_GEN2) += phy-rcar-gen2.o
obj-$(CONFIG_PHY_RCAR_GEN3_USB2) += phy-rcar-gen3-usb2.o
+obj-$(CONFIG_PHY_RCAR_GEN3_USB3) += phy-rcar-gen3-usb3.o
obj-$(CONFIG_OMAP_CONTROL_PHY) += phy-omap-control.o
obj-$(CONFIG_OMAP_USB2) += phy-omap-usb2.o
obj-$(CONFIG_TI_PIPE3) += phy-ti-pipe3.o
diff --git a/drivers/phy/phy-rcar-gen3-usb3.c b/drivers/phy/phy-rcar-gen3-usb3.c
new file mode 100644
index 0000000..87fa24d
--- /dev/null
+++ b/drivers/phy/phy-rcar-gen3-usb3.c
@@ -0,0 +1,166 @@
+/*
+ * Renesas R-Car Gen3 for USB3.0 PHY driver
+ *
+ * Copyright (C) 2017 Mentor Graphics 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, or (at your
+ * option) any later version.
+ *
+ * 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/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#define USB30_CLKSET0 0x34
+#define USB30_CLKSET1 0x36
+
+#define USB30_CLKSET0_FSEL_MASK 0x003F
+#define USB30_CLKSET0_FSEL_USB_XTAL 0x0002
+#define USB30_CLKSET0_FSEL_USB3S0_CLK 0x0027
+
+#define USB30_CLKSET1_PLL_MULTI_MASK 0x1FC0
+#define USB30_CLKSET1_PLL_MULTI_USB_XTAL (0x64 << 6)
+#define USB30_CLKSET1_PLL_MULTI_USB3S0_CLK (0x00 << 6)
+#define USB30_CLKSET1_REF_CLKDIV BIT(3)
+#define USB30_CLKSET1_USB_SEL BIT(0)
+
+struct rcar_gen3_usb3_phy {
+ void __iomem *base;
+ struct phy *phy;
+ u8 use_on_chip_clk;
+};
+
+static int rcar_gen3_phy_usb3_init(struct phy *p)
+{
+ struct rcar_gen3_usb3_phy *phy_dev = phy_get_drvdata(p);
+ void __iomem *usb3_base = phy_dev->base;
+
+ u16 clkset0, clkset1;
+
+ clkset0 = readw(usb3_base + USB30_CLKSET0);
+ clkset1 = readw(usb3_base + USB30_CLKSET1);
+
+ dev_dbg(&p->dev, "USB30_CLKSET0 initial value = 0x%04X\n", clkset0);
+ dev_dbg(&p->dev, "USB30_CLKSET1 initial value = 0x%04X\n", clkset1);
+
+ clkset0 &= ~USB30_CLKSET0_FSEL_MASK;
+ clkset1 &= ~(USB30_CLKSET1_PLL_MULTI_MASK | USB30_CLKSET1_REF_CLKDIV |
+ USB30_CLKSET1_USB_SEL);
+
+ if (phy_dev->use_on_chip_clk) {
+ /* Select 50MHz clock */
+ dev_info(&p->dev, "USE USB_XTAL clock (50MHz)\n");
+ clkset0 |= USB30_CLKSET0_FSEL_USB_XTAL;
+ clkset1 |= USB30_CLKSET1_PLL_MULTI_USB_XTAL |
+ USB30_CLKSET1_REF_CLKDIV;
+ clkset1 &= ~USB30_CLKSET1_USB_SEL;
+ } else {
+ /* Select 100MHz clock */
+ dev_info(&p->dev, "USE USB3S0_CLK reference (100MHz)\n");
+ clkset0 |= USB30_CLKSET0_FSEL_USB3S0_CLK;
+ clkset1 |= USB30_CLKSET1_PLL_MULTI_USB3S0_CLK |
+ USB30_CLKSET1_USB_SEL;
+ clkset1 &= ~USB30_CLKSET1_REF_CLKDIV;
+ }
+
+ dev_dbg(&p->dev, "USB30_CLKSET0 new value = 0x%04X\n", clkset0);
+ dev_dbg(&p->dev, "USB30_CLKSET1 new value = 0x%04X\n", clkset1);
+
+ writew(clkset0, usb3_base + USB30_CLKSET0);
+ writew(clkset1, usb3_base + USB30_CLKSET1);
+
+ return 0;
+}
+
+static int rcar_gen3_phy_usb3_exit(struct phy *p)
+{
+ return 0;
+}
+
+
+static struct phy_ops rcar_gen3_phy_usb3_ops = {
+ .init = rcar_gen3_phy_usb3_init,
+ .exit = rcar_gen3_phy_usb3_exit,
+ .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_phy *phy_dev;
+ struct phy_provider *provider;
+ struct resource *res;
+
+ if (!dev->of_node) {
+ dev_err(dev, "This driver needs a device tree node\n");
+ return -EINVAL;
+ }
+
+ phy_dev = devm_kzalloc(dev, sizeof(*phy_dev), GFP_KERNEL);
+ if (!phy_dev)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ phy_dev->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(phy_dev->base))
+ return PTR_ERR(phy_dev->base);
+
+ phy_dev->use_on_chip_clk = device_property_read_bool(dev,
+ "renesas,use-on-chip-clk");
+
+ pm_runtime_enable(dev);
+ phy_dev->phy = devm_phy_create(dev, NULL, &rcar_gen3_phy_usb3_ops);
+ if (IS_ERR(phy_dev->phy)) {
+ dev_err(dev, "Failed to create Rcar Gen3 USB3 PHY\n");
+ return PTR_ERR(phy_dev->phy);
+ }
+
+ platform_set_drvdata(pdev, phy_dev);
+ phy_set_drvdata(phy_dev->phy, phy_dev);
+
+ provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+ if (IS_ERR(provider)) {
+ dev_err(dev, "Failed to register PHY provider\n");
+ return PTR_ERR(provider);
+ }
+
+ dev_info(&pdev->dev, "Initialized RCAR Gen3 USB3 PHY module\n");
+ return 0;
+}
+
+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("Petre Pircalabu <petre_pircalabu@xxxxxxxxxx>");
--
1.9.1
