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Date: Wed, 4 Nov 2015 11:54:58 +0100
From: John Crispin <blogic@...nwrt.org>
To: Kishon Vijay Abraham I <kishon@...com>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH] phy: ralink-usb: add driver for Mediatek/Ralink
Add a driver to setup the USB phy on Mediatek/Ralink SoCs.
The driver is trivial and only sets the power and host/device mode.
Signed-off-by: John Crispin <blogic@...nwrt.org>
---
.../devicetree/bindings/phy/ralink-usb-phy.txt | 17 ++
drivers/phy/Kconfig | 7 +
drivers/phy/Makefile | 1 +
drivers/phy/phy-ralink-usb.c | 183 ++++++++++++++++++++
4 files changed, 208 insertions(+)
create mode 100644 Documentation/devicetree/bindings/phy/ralink-usb-phy.txt
create mode 100644 drivers/phy/phy-ralink-usb.c
diff --git a/Documentation/devicetree/bindings/phy/ralink-usb-phy.txt b/Documentation/devicetree/bindings/phy/ralink-usb-phy.txt
new file mode 100644
index 0000000..363cff0
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/ralink-usb-phy.txt
@@ -0,0 +1,17 @@
+Mediatek/Ralink USB PHY
+
+Required properties:
+ - compatible: ralink,rt3xxx-usbphy or ralink,mt7620-usbphy
+ - #phy-cells: should be 0
+ - resets: the two reset controllers for host and device
+ - reset-names: the names of the 2 reset controllers
+
+Example:
+
+usbphy: phy {
+ compatible = "ralink,mt7620a-usbphy";
+ #phy-cells = <0>;
+
+ resets = <&rstctrl 22 &rstctrl 25>;
+ reset-names = "host", "device";
+};
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 47da573..01e4df4 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -331,6 +331,13 @@ config PHY_XGENE
help
This option enables support for APM X-Gene SoC multi-purpose PHY.
+config PHY_RALINK_USB
+ tristate "Ralink USB PHY driver"
+ select GENERIC_PHY
+ depends on RALINK
+ help
+ This option enables support for Ralink SoC USB PHY.
+
config PHY_STIH407_USB
tristate "STMicroelectronics USB2 picoPHY driver for STiH407 family"
depends on RESET_CONTROLLER
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index a5b18c1..8dbf6cc 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -46,3 +46,4 @@ obj-$(CONFIG_PHY_QCOM_UFS) += phy-qcom-ufs-qmp-14nm.o
obj-$(CONFIG_PHY_TUSB1210) += phy-tusb1210.o
obj-$(CONFIG_PHY_BRCMSTB_SATA) += phy-brcmstb-sata.o
obj-$(CONFIG_PHY_PISTACHIO_USB) += phy-pistachio-usb.o
+obj-$(CONFIG_PHY_RALINK_USB) += phy-ralink-usb.o
diff --git a/drivers/phy/phy-ralink-usb.c b/drivers/phy/phy-ralink-usb.c
new file mode 100644
index 0000000..d3b590b
--- /dev/null
+++ b/drivers/phy/phy-ralink-usb.c
@@ -0,0 +1,183 @@
+/*
+ * Ralink USB phy driver
+ *
+ * Copyright (C) 2014 John Crispin <blogic@...nwrt.org>
+ *
+ * Based on code from
+ * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
+ *
+ * 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/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+#include <linux/of_platform.h>
+
+#include <asm/mach-ralink/ralink_regs.h>
+
+#define RT_SYSC_REG_SYSCFG1 0x014
+#define RT_SYSC_REG_CLKCFG1 0x030
+#define RT_SYSC_REG_USB_PHY_CFG 0x05c
+
+#define RT_RSTCTRL_UDEV BIT(25)
+#define RT_RSTCTRL_UHST BIT(22)
+#define RT_SYSCFG1_USB0_HOST_MODE BIT(10)
+
+#define MT7620_CLKCFG1_UPHY0_CLK_EN BIT(25)
+#define MT7620_CLKCFG1_UPHY1_CLK_EN BIT(22)
+#define RT_CLKCFG1_UPHY1_CLK_EN BIT(20)
+#define RT_CLKCFG1_UPHY0_CLK_EN BIT(18)
+
+#define USB_PHY_UTMI_8B60M BIT(1)
+#define UDEV_WAKEUP BIT(0)
+
+static atomic_t usb_pwr_ref = ATOMIC_INIT(0);
+static struct reset_control *rstdev;
+static struct reset_control *rsthost;
+static u32 phy_clk;
+static struct phy *rt_phy;
+
+static void usb_phy_enable(int state)
+{
+ if (state)
+ rt_sysc_m32(0, phy_clk, RT_SYSC_REG_CLKCFG1);
+ else
+ rt_sysc_m32(phy_clk, 0, RT_SYSC_REG_CLKCFG1);
+ mdelay(100);
+}
+
+static int ralink_usb_phy_init(struct phy *_phy)
+{
+ return 0;
+}
+
+static int ralink_usb_phy_exit(struct phy *_phy)
+{
+ return 0;
+}
+
+static int ralink_usb_phy_power_on(struct phy *_phy)
+{
+ if (atomic_inc_return(&usb_pwr_ref) == 1) {
+ int host = 1;
+ u32 t;
+
+ usb_phy_enable(1);
+
+ if (host) {
+ rt_sysc_m32(0, RT_SYSCFG1_USB0_HOST_MODE,
+ RT_SYSC_REG_SYSCFG1);
+ if (!IS_ERR(rsthost))
+ reset_control_deassert(rsthost);
+ if (!IS_ERR(rstdev))
+ reset_control_deassert(rstdev);
+ } else {
+ rt_sysc_m32(RT_SYSCFG1_USB0_HOST_MODE, 0,
+ RT_SYSC_REG_SYSCFG1);
+ if (!IS_ERR(rstdev))
+ reset_control_deassert(rstdev);
+ }
+ mdelay(100);
+
+ t = rt_sysc_r32(RT_SYSC_REG_USB_PHY_CFG);
+ dev_info(&_phy->dev, "remote usb device wakeup %s\n",
+ (t & UDEV_WAKEUP) ? ("enabbled") : ("disabled"));
+ if (t & USB_PHY_UTMI_8B60M)
+ dev_info(&_phy->dev, "UTMI 8bit 60MHz\n");
+ else
+ dev_info(&_phy->dev, "UTMI 16bit 30MHz\n");
+ }
+
+ return 0;
+}
+
+static int ralink_usb_phy_power_off(struct phy *_phy)
+{
+ if (atomic_dec_return(&usb_pwr_ref) == 0) {
+ usb_phy_enable(0);
+ if (!IS_ERR(rstdev))
+ reset_control_assert(rstdev);
+ if (!IS_ERR(rsthost))
+ reset_control_assert(rsthost);
+ }
+
+ return 0;
+}
+
+static struct phy_ops ralink_usb_phy_ops = {
+ .init = ralink_usb_phy_init,
+ .exit = ralink_usb_phy_exit,
+ .power_on = ralink_usb_phy_power_on,
+ .power_off = ralink_usb_phy_power_off,
+ .owner = THIS_MODULE,
+};
+
+static struct phy *ralink_usb_phy_xlate(struct device *dev,
+ struct of_phandle_args *args)
+{
+ return rt_phy;
+}
+
+static const struct of_device_id ralink_usb_phy_of_match[] = {
+ {
+ .compatible = "ralink,rt3xxx-usbphy",
+ .data = (void *) (RT_CLKCFG1_UPHY1_CLK_EN |
+ RT_CLKCFG1_UPHY0_CLK_EN)
+ }, {
+ .compatible = "ralink,mt7620a-usbphy",
+ .data = (void *) (MT7620_CLKCFG1_UPHY1_CLK_EN |
+ MT7620_CLKCFG1_UPHY0_CLK_EN) },
+ { },
+};
+MODULE_DEVICE_TABLE(of, ralink_usb_phy_of_match);
+
+static int ralink_usb_phy_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct phy_provider *phy_provider;
+ const struct of_device_id *match;
+
+ match = of_match_device(ralink_usb_phy_of_match, &pdev->dev);
+ phy_clk = (int) match->data;
+
+ rsthost = devm_reset_control_get(&pdev->dev, "host");
+ rstdev = devm_reset_control_get(&pdev->dev, "device");
+
+ rt_phy = devm_phy_create(dev, NULL, &ralink_usb_phy_ops, NULL);
+ if (IS_ERR(rt_phy)) {
+ dev_err(dev, "failed to create PHY\n");
+ return PTR_ERR(rt_phy);
+ }
+
+ phy_provider = devm_of_phy_provider_register(dev, ralink_usb_phy_xlate);
+
+ return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static struct platform_driver ralink_usb_phy_driver = {
+ .probe = ralink_usb_phy_probe,
+ .driver = {
+ .of_match_table = ralink_usb_phy_of_match,
+ .name = "ralink-usb-phy",
+ }
+};
+module_platform_driver(ralink_usb_phy_driver);
+
+MODULE_DESCRIPTION("Ralink USB phy driver");
+MODULE_AUTHOR("John Crispin <blogic@...nwrt.org>");
+MODULE_LICENSE("GPL v2");
--
1.7.10.4
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