[PATCH] phy: rcar-gen3-usb2: Add R-Car Gen3 USB2 PHY driver
From: Yoshihiro Shimoda
Date: Thu Aug 20 2015 - 02:28:39 EST
This patch adds support for R-Car generation 3 USB2 PHY driver.
This SoC has 3 EHCI/OHCI channels, and the channel 0 is shared
with the HSUSB (USB2.0 peripheral) device.
So, the purpose of this driver is:
1) initializes some registers of SoC specific to use the
{ehci,ohci}-platform driver.
2) detects id pin to select host or peripheral on the channel 0.
For now, this driver only supports 1) above.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
---
.../devicetree/bindings/phy/rcar-gen3-phy-usb2.txt | 37 +++
drivers/phy/Kconfig | 6 +
drivers/phy/Makefile | 1 +
drivers/phy/phy-rcar-gen3-usb2.c | 262 +++++++++++++++++++++
4 files changed, 306 insertions(+)
create mode 100644 Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
create mode 100644 drivers/phy/phy-rcar-gen3-usb2.c
diff --git a/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
new file mode 100644
index 0000000..1e8437f
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
@@ -0,0 +1,37 @@
+* Renesas R-Car generation 3 USB 2.0 PHY
+
+This file provides information on what the device node for the R-Car generation
+3 USB 2.0 PHY contains.
+
+Required properties:
+- compatible: "renesas,usb2-phy-r8a7795" if the device is a part of R8A7795 SoC.
+- reg: offset and length of the USB2.0 host register block.
+- reg-names: must be "usb2".
+- clocks: clock phandle and specifier pair.
+- clock-names: string, clock input name, must be "usb2", and optional "hsusb".
+- #phy-cells: see phy-bindings.txt in the same directory, must be <0>.
+
+Optional proparies:
+To use a USB channel which EHCI/OHCI and HSUSB are combined, the device tree
+node should set HSUSB proparies to reg and reg-names proparies:
+- reg: offset and length of the HSUSB register block.
+- reg-names: must be "hsusb".
+
+Example (R-Car H3):
+
+ usb-phy@ee080200 {
+ compatible = "renesas,usb2-phy-r8a7795";
+ reg = <0 0xee080200 0 0x6ff>, <0 0xe6590100 0 0x100>;
+ reg-names = "usb2", "hsusb";
+ clocks = <&mstp7_clks R8A7795_CLK_EHCI0>,
+ <&mstp7_clks R8A7795_CLK_HSUSB>;
+ clock-names = "usb2", "hsusb";
+ };
+
+ usb-phy@ee0a0200 {
+ compatible = "renesas,usb2-phy-r8a7795";
+ reg = <0 0xee0a0200 0 0x6ff>;
+ reg-names = "usb2";
+ clocks = <&mstp7_clks R8A7795_CLK_EHCI0>;
+ clock-names = "usb2";
+ };
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 47da573..ee300fa 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -118,6 +118,12 @@ config PHY_RCAR_GEN2
help
Support for USB PHY found on Renesas R-Car generation 2 SoCs.
+config PHY_RCAR_GEN3_USB2
+ tristate "Renesas R-Car generation 3 USB 2.0 PHY driver"
+ depends on GENERIC_PHY
+ help
+ Support for USB 2.0 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 a5b18c1..97e83bc 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_PHY_MVEBU_SATA) += phy-mvebu-sata.o
obj-$(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_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-usb2.c b/drivers/phy/phy-rcar-gen3-usb2.c
new file mode 100644
index 0000000..e319eaf
--- /dev/null
+++ b/drivers/phy/phy-rcar-gen3-usb2.c
@@ -0,0 +1,262 @@
+/*
+ * Renesas R-Car Gen3 for USB2.0 PHY driver
+ *
+ * Copyright (C) 2015 Renesas Electronics Corporation
+ *
+ * This is based on the phy-rcar-gen2 driver:
+ * Copyright (C) 2014 Renesas Solutions Corp.
+ * Copyright (C) 2014 Cogent Embedded, Inc.
+ *
+ * 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/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/spinlock.h>
+
+#include <asm/cmpxchg.h>
+
+/******* USB2.0 Host registers (original offset is +0x200) *******/
+#define USB2_INT_ENABLE 0x000
+#define USB2_USBCTR 0x00c
+#define USB2_SPD_RSM_TIMSET 0x10c
+#define USB2_OC_TIMSET 0x110
+
+/* INT_ENABLE */
+#define USB2_INT_ENABLE_USBH_INTB_EN BIT(2)
+#define USB2_INT_ENABLE_USBH_INTA_EN BIT(1)
+#define USB2_INT_ENABLE_INIT (USB2_INT_ENABLE_USBH_INTB_EN | \
+ USB2_INT_ENABLE_USBH_INTA_EN)
+
+/* USBCTR */
+#define USB2_USBCTR_DIRPD BIT(2)
+#define USB2_USBCTR_PLL_RST BIT(1)
+
+/* SPD_RSM_TIMSET */
+#define USB2_SPD_RSM_TIMSET_INIT 0x014e029b
+
+/* OC_TIMSET */
+#define USB2_OC_TIMSET_INIT 0x000209ab
+
+/******* HSUSB registers (original offset is +0x100) *******/
+#define HSUSB_LPSTS 0x02
+#define HSUSB_UGCTRL2 0x84
+
+/* Low Power Status register (LPSTS) */
+#define HSUSB_LPSTS_SUSPM 0x4000
+
+/* USB General control register 2 (UGCTRL2) */
+#define HSUSB_UGCTRL2_MASK 0x00000031 /* bit[31:6] should be 0 */
+#define HSUSB_UGCTRL2_USB0SEL 0x00000030
+#define HSUSB_UGCTRL2_USB0SEL_HOST 0x00000010
+#define HSUSB_UGCTRL2_USB0SEL_HS_USB 0x00000020
+#define HSUSB_UGCTRL2_USB0SEL_OTG 0x00000030
+
+struct rcar_gen3_phy_usb2_data {
+ void __iomem *base;
+ struct clk *clk;
+};
+
+struct rcar_gen3_phy_usb2_channel {
+ struct rcar_gen3_phy_usb2_data usb2;
+ struct rcar_gen3_phy_usb2_data hsusb;
+ struct phy *phy;
+ spinlock_t lock;
+};
+
+static int rcar_gen3_phy_usb2_init(struct phy *p)
+{
+ struct rcar_gen3_phy_usb2_channel *channel = phy_get_drvdata(p);
+ unsigned long flags;
+ void __iomem *usb2_base = channel->usb2.base;
+ void __iomem *hsusb_base = channel->hsusb.base;
+ u32 tmp;
+
+ /* Since ops->init() is called once, this driver enables both clocks */
+ clk_prepare_enable(channel->usb2.clk);
+ clk_prepare_enable(channel->hsusb.clk);
+
+ spin_lock_irqsave(&channel->lock, flags);
+
+ /* Initialize USB2 part */
+ writel(USB2_INT_ENABLE_INIT, usb2_base + USB2_INT_ENABLE);
+ writel(USB2_SPD_RSM_TIMSET_INIT, usb2_base + USB2_SPD_RSM_TIMSET);
+ writel(USB2_OC_TIMSET_INIT, usb2_base + USB2_OC_TIMSET);
+
+ /* Initialize HSUSB part */
+ if (hsusb_base) {
+ /* TODO: support "OTG" mode */
+ tmp = readl(hsusb_base + HSUSB_UGCTRL2);
+ tmp = (tmp & ~HSUSB_UGCTRL2_USB0SEL) |
+ HSUSB_UGCTRL2_USB0SEL_HOST;
+ writel(tmp & HSUSB_UGCTRL2_MASK, hsusb_base + HSUSB_UGCTRL2);
+ }
+
+ spin_unlock_irqrestore(&channel->lock, flags);
+
+ return 0;
+}
+
+static int rcar_gen3_phy_usb2_exit(struct phy *p)
+{
+ struct rcar_gen3_phy_usb2_channel *channel = phy_get_drvdata(p);
+
+ writel(0, channel->usb2.base + USB2_INT_ENABLE);
+
+ clk_disable_unprepare(channel->hsusb.clk);
+ clk_disable_unprepare(channel->usb2.clk);
+
+ return 0;
+}
+
+static int rcar_gen3_phy_usb2_power_on(struct phy *p)
+{
+ struct rcar_gen3_phy_usb2_channel *channel = phy_get_drvdata(p);
+ void __iomem *usb2_base = channel->usb2.base;
+ void __iomem *hsusb_base = channel->hsusb.base;
+ unsigned long flags;
+ u32 tmp;
+
+ spin_lock_irqsave(&channel->lock, flags);
+
+ tmp = readl(usb2_base + USB2_USBCTR);
+ tmp |= USB2_USBCTR_PLL_RST;
+ writel(tmp, usb2_base + USB2_USBCTR);
+ tmp &= ~USB2_USBCTR_PLL_RST;
+ writel(tmp, usb2_base + USB2_USBCTR);
+
+ /*
+ * TODO: To reduce power consuming, this driver should set the SUSPM
+ * after the PHY detects ID pin as peripherai.
+ */
+ if (hsusb_base) {
+ /* Power on HSUSB PHY */
+ tmp = readw(hsusb_base + HSUSB_LPSTS);
+ tmp |= HSUSB_LPSTS_SUSPM;
+ writew(tmp, hsusb_base + HSUSB_LPSTS);
+ }
+
+ spin_unlock_irqrestore(&channel->lock, flags);
+
+ return 0;
+}
+
+static int rcar_gen3_phy_usb2_power_off(struct phy *p)
+{
+ struct rcar_gen3_phy_usb2_channel *channel = phy_get_drvdata(p);
+ void __iomem *hsusb_base = channel->hsusb.base;
+ unsigned long flags;
+ u32 tmp;
+
+ spin_lock_irqsave(&channel->lock, flags);
+
+ if (hsusb_base) {
+ /* Power off HSUSB PHY */
+ tmp = readw(hsusb_base + HSUSB_LPSTS);
+ tmp &= ~HSUSB_LPSTS_SUSPM;
+ writew(tmp, hsusb_base + HSUSB_LPSTS);
+ }
+
+ spin_unlock_irqrestore(&channel->lock, flags);
+
+ return 0;
+}
+
+static struct phy_ops rcar_gen3_phy_usb2_ops = {
+ .init = rcar_gen3_phy_usb2_init,
+ .exit = rcar_gen3_phy_usb2_exit,
+ .power_on = rcar_gen3_phy_usb2_power_on,
+ .power_off = rcar_gen3_phy_usb2_power_off,
+ .owner = THIS_MODULE,
+};
+
+static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = {
+ { .compatible = "renesas,usb2-phy-r8a7795" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb2_match_table);
+
+static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct rcar_gen3_phy_usb2_channel *channel;
+ struct phy_provider *provider;
+ struct resource *res;
+
+ if (!dev->of_node) {
+ dev_err(dev, "This driver needs device tree\n");
+ return -EINVAL;
+ }
+
+ channel = devm_kzalloc(dev, sizeof(*channel), GFP_KERNEL);
+ if (!channel)
+ return -ENOMEM;
+
+ spin_lock_init(&channel->lock);
+
+ channel->usb2.clk = devm_clk_get(dev, "usb2");
+ if (IS_ERR(channel->usb2.clk)) {
+ dev_err(dev, "Can't get USB2 clock\n");
+ return PTR_ERR(channel->usb2.clk);
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "usb2");
+ channel->usb2.base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(channel->usb2.base))
+ return PTR_ERR(channel->usb2.base);
+
+ /* "hsusb" memory resource is optional */
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hsusb");
+
+ /* To avoid error message by devm_ioremap_resource() */
+ if (res) {
+ channel->hsusb.base = devm_ioremap_resource(dev, res);
+ if (!IS_ERR(channel->hsusb.base)) {
+ channel->hsusb.clk = devm_clk_get(dev, "hsusb");
+ if (IS_ERR(channel->hsusb.clk)) {
+ dev_err(dev, "Can't get HSUSB clock\n");
+ return PTR_ERR(channel->hsusb.clk);
+ }
+ } else {
+ channel->hsusb.base = NULL;
+ }
+ }
+
+ channel->phy = devm_phy_create(dev, NULL, &rcar_gen3_phy_usb2_ops);
+ if (IS_ERR(channel->phy)) {
+ dev_err(dev, "Failed to create USB2 PHY\n");
+ return PTR_ERR(channel->phy);
+ }
+
+ phy_set_drvdata(channel->phy, channel);
+
+ 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_set_drvdata(dev, channel);
+
+ return 0;
+}
+
+static struct platform_driver rcar_gen3_phy_usb2_driver = {
+ .driver = {
+ .name = "phy_rcar_gen3_usb2",
+ .of_match_table = rcar_gen3_phy_usb2_match_table,
+ },
+ .probe = rcar_gen3_phy_usb2_probe,
+};
+module_platform_driver(rcar_gen3_phy_usb2_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 2.0 PHY");
+MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>");
--
1.9.1
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