From 71e09658d3544143e46ae76e76da8a322cd73e1d Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Sun, 14 Jul 2013 23:31:19 +0200
Subject: [PATCH 119/133] USB: phy: add ralink SoC driver

Signed-off-by: John Crispin <blogic@openwrt.org>
---
 drivers/usb/phy/Kconfig      |    8 ++
 drivers/usb/phy/Makefile     |    1 +
 drivers/usb/phy/ralink-phy.c |  191 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 200 insertions(+)
 create mode 100644 drivers/usb/phy/ralink-phy.c

--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -210,4 +210,12 @@ config USB_ULPI_VIEWPORT
 	  Provides read/write operations to the ULPI phy register set for
 	  controllers with a viewport register (e.g. Chipidea/ARC controllers).
 
+config RALINK_USBPHY
+	bool "Ralink USB PHY controller Driver"
+	depends on MIPS && RALINK
+	select USB_OTG_UTILS
+	help
+	  Enable this to support ralink USB phy controller for ralink
+	  SoCs.
+
 endif # USB_PHY
--- a/drivers/usb/phy/Makefile
+++ b/drivers/usb/phy/Makefile
@@ -31,3 +31,4 @@ obj-$(CONFIG_USB_MXS_PHY)		+= phy-mxs-us
 obj-$(CONFIG_USB_RCAR_PHY)		+= phy-rcar-usb.o
 obj-$(CONFIG_USB_ULPI)			+= phy-ulpi.o
 obj-$(CONFIG_USB_ULPI_VIEWPORT)		+= phy-ulpi-viewport.o
+obj-$(CONFIG_RALINK_USBPHY)		+= ralink-phy.o
--- /dev/null
+++ b/drivers/usb/phy/ralink-phy.c
@@ -0,0 +1,191 @@
+/*
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ *
+ * based on: Renesas R-Car USB phy driver
+ *
+ * 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/delay.h>
+#include <linux/io.h>
+#include <linux/usb/otg.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/module.h>
+#include <linux/reset.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 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 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 usb_power_on(struct usb_phy *phy)
+{
+	if (atomic_inc_return(&usb_pwr_ref) == 1) {
+		u32 t;
+
+		usb_phy_enable(1);
+
+//		reset_control_assert(rstdev);
+//		reset_control_assert(rsthost);
+
+		if (OTG_STATE_B_HOST) {
+			rt_sysc_m32(0, RT_SYSCFG1_USB0_HOST_MODE, RT_SYSC_REG_SYSCFG1);
+			reset_control_deassert(rsthost);
+		} else {
+			rt_sysc_m32(RT_SYSCFG1_USB0_HOST_MODE, 0, RT_SYSC_REG_SYSCFG1);
+			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 void usb_power_off(struct usb_phy *phy)
+{
+	if (atomic_dec_return(&usb_pwr_ref) == 0) {
+		usb_phy_enable(0);
+		reset_control_assert(rstdev);
+		reset_control_assert(rsthost);
+	}
+}
+
+static int usb_set_host(struct usb_otg *otg, struct usb_bus *host)
+{
+	otg->gadget = NULL;
+	otg->host = host;
+
+	return 0;
+}
+
+static int usb_set_peripheral(struct usb_otg *otg,
+		struct usb_gadget *gadget)
+{
+	otg->host = NULL;
+	otg->gadget = gadget;
+
+	return 0;
+}
+
+static const struct of_device_id ralink_usbphy_dt_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_UPHY0_CLK_EN },
+	{},
+};
+MODULE_DEVICE_TABLE(of, ralink_usbphy_dt_match);
+
+static int usb_phy_probe(struct platform_device *pdev)
+{
+	const struct of_device_id *match;
+	struct device *dev = &pdev->dev;
+	struct usb_otg *otg;
+	struct usb_phy *phy;
+	int ret;
+
+	match = of_match_device(ralink_usbphy_dt_match, &pdev->dev);
+	phy_clk = (int) match->data;
+
+	rsthost = devm_reset_control_get(&pdev->dev, "host");
+	if (IS_ERR(rsthost))
+		return PTR_ERR(rsthost);
+
+	rstdev = devm_reset_control_get(&pdev->dev, "device");
+	if (IS_ERR(rstdev))
+		return PTR_ERR(rstdev);
+
+	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
+	if (!phy) {
+		dev_err(&pdev->dev, "unable to allocate memory for USB PHY\n");
+		return -ENOMEM;
+	}
+
+	otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
+	if (!otg) {
+		dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n");
+		return -ENOMEM;
+	}
+
+	phy->dev = dev;
+	phy->label = dev_name(dev);
+	phy->init = usb_power_on;
+	phy->shutdown = usb_power_off;
+	otg->set_host = usb_set_host;
+	otg->set_peripheral = usb_set_peripheral;
+	otg->phy = phy;
+	phy->otg = otg;
+	ret = usb_add_phy(phy, USB_PHY_TYPE_USB2);
+
+	if (ret < 0) {
+		dev_err(dev, "usb phy addition error\n");
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, phy);
+
+	dev_info(&pdev->dev, "loaded\n");
+
+	return ret;
+}
+
+static int usb_phy_remove(struct platform_device *pdev)
+{
+	struct usb_phy *phy = platform_get_drvdata(pdev);
+
+	usb_remove_phy(phy);
+
+	return 0;
+}
+
+static struct platform_driver usb_phy_driver = {
+	.driver		= {
+		.owner	= THIS_MODULE,
+		.name	= "rt3xxx-usbphy",
+		.of_match_table = of_match_ptr(ralink_usbphy_dt_match),
+	},
+	.probe		= usb_phy_probe,
+	.remove		= usb_phy_remove,
+};
+
+module_platform_driver(usb_phy_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Ralink USB phy");
+MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
