--- /dev/null
+/*
+ * Renesas R-Car Gen2 USB phy driver
+ *
+ * Copyright (C) 2013 Renesas Solutions Corp.
+ * Copyright (C) 2013 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/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_data/usb-rcar-gen2-phy.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/usb/otg.h>
+
+struct rcar_gen2_usb_phy_priv {
+ struct usb_phy phy;
+ void __iomem *base;
+ struct clk *clk;
+ spinlock_t lock;
+ int usecount;
+ u32 ugctrl2;
+};
+
+#define usb_phy_to_priv(p) container_of(p, struct rcar_gen2_usb_phy_priv, phy)
+
+/* Low Power Status register */
+#define USBHS_LPSTS_REG 0x02
+#define USBHS_LPSTS_SUSPM (1 << 14)
+
+/* USB General control register */
+#define USBHS_UGCTRL_REG 0x80
+#define USBHS_UGCTRL_CONNECT (1 << 2)
+#define USBHS_UGCTRL_PLLRESET (1 << 0)
+
+/* USB General control register 2 */
+#define USBHS_UGCTRL2_REG 0x84
+#define USBHS_UGCTRL2_USB0_PCI (1 << 4)
+#define USBHS_UGCTRL2_USB0_HS (3 << 4)
+#define USBHS_UGCTRL2_USB2_PCI (0 << 31)
+#define USBHS_UGCTRL2_USB2_SS (1 << 31)
+
+/* USB General status register */
+#define USBHS_UGSTS_REG 0x88
+#define USBHS_UGSTS_LOCK (3 << 8)
+
+/* Enable USBHS internal phy */
+static int __rcar_gen2_usbhs_phy_enable(void __iomem *base)
+{
+ u32 val;
+ int i;
+
+ /* USBHS PHY power on */
+ val = ioread32(base + USBHS_UGCTRL_REG);
+ val &= ~USBHS_UGCTRL_PLLRESET;
+ iowrite32(val, base + USBHS_UGCTRL_REG);
+
+ val = ioread16(base + USBHS_LPSTS_REG);
+ val |= USBHS_LPSTS_SUSPM;
+ iowrite16(val, base + USBHS_LPSTS_REG);
+
+ for (i = 0; i < 20; i++) {
+ val = ioread32(base + USBHS_UGSTS_REG);
+ if ((val & USBHS_UGSTS_LOCK) == USBHS_UGSTS_LOCK) {
+ val = ioread32(base + USBHS_UGCTRL_REG);
+ val |= USBHS_UGCTRL_CONNECT;
+ iowrite32(val, base + USBHS_UGCTRL_REG);
+ return 0;
+ }
+ udelay(1);
+ }
+
+ /* Timed out waiting for the PLL lock */
+ return -ETIMEDOUT;
+}
+
+/* Disable USBHS internal phy */
+static int __rcar_gen2_usbhs_phy_disable(void __iomem *base)
+{
+ u32 val;
+
+ /* USBHS PHY power off */
+ val = ioread32(base + USBHS_UGCTRL_REG);
+ val &= ~USBHS_UGCTRL_CONNECT;
+ iowrite32(val, base + USBHS_UGCTRL_REG);
+
+ val = ioread16(base + USBHS_LPSTS_REG);
+ val &= ~USBHS_LPSTS_SUSPM;
+ iowrite16(val, base + USBHS_LPSTS_REG);
+
+ val = ioread32(base + USBHS_UGCTRL_REG);
+ val |= USBHS_UGCTRL_PLLRESET;
+ iowrite32(val, base + USBHS_UGCTRL_REG);
+ return 0;
+}
+
+/* Setup USB channels */
+static void __rcar_gen2_usb_phy_init(struct rcar_gen2_usb_phy_priv *priv)
+{
+ u32 val;
+
+ clk_prepare_enable(priv->clk);
+
+ /* Set USB channels in the USBHS UGCTRL2 register */
+ val = ioread32(priv->base);
+ val &= ~(USBHS_UGCTRL2_USB0_HS | USBHS_UGCTRL2_USB2_SS);
+ val |= priv->ugctrl2;
+ iowrite32(val, priv->base);
+}
+
+/* Shutdown USB channels */
+static void __rcar_gen2_usb_phy_shutdown(struct rcar_gen2_usb_phy_priv *priv)
+{
+ __rcar_gen2_usbhs_phy_disable(priv->base);
+ clk_disable_unprepare(priv->clk);
+}
+
+static int rcar_gen2_usb_phy_set_suspend(struct usb_phy *phy, int suspend)
+{
+ struct rcar_gen2_usb_phy_priv *priv = usb_phy_to_priv(phy);
+ unsigned long flags;
+ int retval;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ retval = suspend ? __rcar_gen2_usbhs_phy_disable(priv->base) :
+ __rcar_gen2_usbhs_phy_enable(priv->base);
+ spin_unlock_irqrestore(&priv->lock, flags);
+ return retval;
+}
+
+static int rcar_gen2_usb_phy_init(struct usb_phy *phy)
+{
+ struct rcar_gen2_usb_phy_priv *priv = usb_phy_to_priv(phy);
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ /*
+ * Enable the clock and setup USB channels
+ * if it's the first user
+ */
+ if (!priv->usecount++)
+ __rcar_gen2_usb_phy_init(priv);
+ spin_unlock_irqrestore(&priv->lock, flags);
+ return 0;
+}
+
+static void rcar_gen2_usb_phy_shutdown(struct usb_phy *phy)
+{
+ struct rcar_gen2_usb_phy_priv *priv = usb_phy_to_priv(phy);
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ if (!priv->usecount) {
+ dev_warn(phy->dev, "Trying to disable phy with 0 usecount\n");
+ goto out;
+ }
+
+ /* Disable everything if it's the last user */
+ if (!--priv->usecount)
+ __rcar_gen2_usb_phy_shutdown(priv);
+out:
+ spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static int rcar_gen2_usb_phy_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct rcar_gen2_phy_platform_data *pdata;
+ struct rcar_gen2_usb_phy_priv *priv;
+ struct resource *res;
+ void __iomem *base;
+ struct clk *clk;
+ int retval;
+
+ pdata = dev_get_platdata(&pdev->dev);
+ if (!pdata) {
+ dev_err(dev, "No platform data\n");
+ return -EINVAL;
+ }
+
+ clk = devm_clk_get(&pdev->dev, "usbhs");
+ if (IS_ERR(clk)) {
+ dev_err(&pdev->dev, "Can't get the clock\n");
+ return PTR_ERR(clk);
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv) {
+ dev_err(dev, "Memory allocation failed\n");
+ return -ENOMEM;
+ }
+
+ spin_lock_init(&priv->lock);
+ priv->clk = clk;
+ priv->base = base;
+ priv->ugctrl2 = pdata->chan0_pci ?
+ USBHS_UGCTRL2_USB0_PCI : USBHS_UGCTRL2_USB0_HS;
+ priv->ugctrl2 |= pdata->chan2_pci ?
+ USBHS_UGCTRL2_USB2_PCI : USBHS_UGCTRL2_USB2_SS;
+ priv->phy.dev = dev;
+ priv->phy.label = dev_name(dev);
+ priv->phy.init = rcar_gen2_usb_phy_init;
+ priv->phy.shutdown = rcar_gen2_usb_phy_shutdown;
+ priv->phy.set_suspend = rcar_gen2_usb_phy_set_suspend;
+
+ retval = usb_add_phy(&priv->phy, USB_PHY_TYPE_USB2);
+ if (retval < 0) {
+ dev_err(dev, "Failed to add USB phy\n");
+ return retval;
+ }
+
+ platform_set_drvdata(pdev, priv);
+
+ return retval;
+}
+
+static int rcar_gen2_usb_phy_remove(struct platform_device *pdev)
+{
+ struct rcar_gen2_usb_phy_priv *priv = platform_get_drvdata(pdev);
+
+ usb_remove_phy(&priv->phy);
+
+ return 0;
+}
+
+static struct platform_driver rcar_gen2_usb_phy_driver = {
+ .driver = {
+ .name = "usb_phy_rcar_gen2",
+ },
+ .probe = rcar_gen2_usb_phy_probe,
+ .remove = rcar_gen2_usb_phy_remove,
+};
+
+module_platform_driver(rcar_gen2_usb_phy_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Renesas R-Car Gen2 USB phy");
+MODULE_AUTHOR("Valentine Barshak <valentine.barshak@cogentembedded.com>");
projects / karo-tx-linux.git / commitdiff