usb: phy: add R-Car USB phy driver

This patch adds Renesas R-Car USB phy driver.
It supports R8A7779 chip at this point.

R-Car has some USB controllers, but has only one phy-initializer.
So, this driver is counting users.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index 63c339b3e676f2f439db0178c9debc627d8aa5ac..7eb73c561bd2896d5c135a8c53e40e0ae352bad6 100644 (file)
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -32,3 +32,15 @@ config MV_U3D_PHY
        help
          Enable this to support Marvell USB 3.0 phy controller for Marvell
          SoC.
+
+config USB_RCAR_PHY
+       tristate "Renesas R-Car USB phy support"
+       depends on USB || USB_GADGET
+       select USB_OTG_UTILS
+       help
+         Say Y here to add support for the Renesas R-Car USB phy driver.
+         This chip is typically used as USB phy for USB host, gadget.
+         This driver supports: R8A7779
+
+         To compile this driver as a module, choose M here: the
+         module will be called rcar-phy.

diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
index b069f29f122590a5b76dccb96acbe38d06250668..1a579a860a037b3b9226839c0d5fa7981a5d0687 100644 (file)
--- a/drivers/usb/phy/Makefile
+++ b/drivers/usb/phy/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_OMAP_USB2)                 += omap-usb2.o
 obj-$(CONFIG_USB_ISP1301)              += isp1301.o
 obj-$(CONFIG_MV_U3D_PHY)               += mv_u3d_phy.o
 obj-$(CONFIG_USB_EHCI_TEGRA)   += tegra_usb_phy.o
+obj-$(CONFIG_USB_RCAR_PHY)             += rcar-phy.o

diff --git a/drivers/usb/phy/rcar-phy.c b/drivers/usb/phy/rcar-phy.c
new file mode 100644 (file)
index 0000000..792f505
--- /dev/null
+++ b/drivers/usb/phy/rcar-phy.c
@@ -0,0 +1,220 @@
+/*
+ * Renesas R-Car USB phy driver
+ *
+ * Copyright (C) 2012 Renesas Solutions Corp.
+ * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
+ *
+ * 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/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/module.h>
+
+/* USBH common register */
+#define USBPCTRL0      0x0800
+#define USBPCTRL1      0x0804
+#define USBST          0x0808
+#define USBEH0         0x080C
+#define USBOH0         0x081C
+#define USBCTL0                0x0858
+#define EIIBC1         0x0094
+#define EIIBC2         0x009C
+
+/* USBPCTRL1 */
+#define PHY_RST                (1 << 2)
+#define PLL_ENB                (1 << 1)
+#define PHY_ENB                (1 << 0)
+
+/* USBST */
+#define ST_ACT         (1 << 31)
+#define ST_PLL         (1 << 30)
+
+struct rcar_usb_phy_priv {
+       struct usb_phy phy;
+       spinlock_t lock;
+
+       void __iomem *reg0;
+       void __iomem *reg1;
+       int counter;
+};
+
+#define usb_phy_to_priv(p) container_of(p, struct rcar_usb_phy_priv, phy)
+
+
+/*
+ * USB initial/install operation.
+ *
+ * This function setup USB phy.
+ * The used value and setting order came from
+ * [USB :: Initial setting] on datasheet.
+ */
+static int rcar_usb_phy_init(struct usb_phy *phy)
+{
+       struct rcar_usb_phy_priv *priv = usb_phy_to_priv(phy);
+       struct device *dev = phy->dev;
+       void __iomem *reg0 = priv->reg0;
+       void __iomem *reg1 = priv->reg1;
+       int i;
+       u32 val;
+       unsigned long flags;
+
+       spin_lock_irqsave(&priv->lock, flags);
+       if (priv->counter++ == 0) {
+
+               /*
+                * USB phy start-up
+                */
+
+               /* (1) USB-PHY standby release */
+               iowrite32(PHY_ENB, (reg0 + USBPCTRL1));
+
+               /* (2) start USB-PHY internal PLL */
+               iowrite32(PHY_ENB | PLL_ENB, (reg0 + USBPCTRL1));
+
+               /* (3) USB module status check */
+               for (i = 0; i < 1024; i++) {
+                       udelay(10);
+                       val = ioread32(reg0 + USBST);
+                       if (val == (ST_ACT | ST_PLL))
+                               break;
+               }
+
+               if (val != (ST_ACT | ST_PLL)) {
+                       dev_err(dev, "USB phy not ready\n");
+                       goto phy_init_end;
+               }
+
+               /* (4) USB-PHY reset clear */
+               iowrite32(PHY_ENB | PLL_ENB | PHY_RST, (reg0 + USBPCTRL1));
+
+               /* set platform specific port settings */
+               iowrite32(0x00000000, (reg0 + USBPCTRL0));
+
+               /*
+                * EHCI IP internal buffer setting
+                * EHCI IP internal buffer enable
+                *
+                * These are recommended value of a datasheet
+                * see [USB :: EHCI internal buffer setting]
+                */
+               iowrite32(0x00ff0040, (reg0 + EIIBC1));
+               iowrite32(0x00ff0040, (reg1 + EIIBC1));
+
+               iowrite32(0x00000001, (reg0 + EIIBC2));
+               iowrite32(0x00000001, (reg1 + EIIBC2));
+
+               /*
+                * Bus alignment settings
+                */
+
+               /* (1) EHCI bus alignment (little endian) */
+               iowrite32(0x00000000, (reg0 + USBEH0));
+
+               /* (1) OHCI bus alignment (little endian) */
+               iowrite32(0x00000000, (reg0 + USBOH0));
+       }
+
+phy_init_end:
+       spin_unlock_irqrestore(&priv->lock, flags);
+
+       return 0;
+}
+
+static void rcar_usb_phy_shutdown(struct usb_phy *phy)
+{
+       struct rcar_usb_phy_priv *priv = usb_phy_to_priv(phy);
+       void __iomem *reg0 = priv->reg0;
+       unsigned long flags;
+
+       spin_lock_irqsave(&priv->lock, flags);
+
+       if (priv->counter-- == 1) { /* last user */
+               iowrite32(0x00000000, (reg0 + USBPCTRL0));
+               iowrite32(0x00000000, (reg0 + USBPCTRL1));
+       }
+
+       spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static int __devinit rcar_usb_phy_probe(struct platform_device *pdev)
+{
+       struct rcar_usb_phy_priv *priv;
+       struct resource *res0, *res1;
+       struct device *dev = &pdev->dev;
+       void __iomem *reg0, *reg1;
+       int ret;
+
+       res0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       res1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+       if (!res0 || !res1) {
+               dev_err(dev, "Not enough platform resources\n");
+               return -EINVAL;
+       }
+
+       /*
+        * CAUTION
+        *
+        * Because this phy address is also mapped under OHCI/EHCI address area,
+        * this driver can't use devm_request_and_ioremap(dev, res) here
+        */
+       reg0 = devm_ioremap_nocache(dev, res0->start, resource_size(res0));
+       reg1 = devm_ioremap_nocache(dev, res1->start, resource_size(res1));
+       if (!reg0 || !reg1) {
+               dev_err(dev, "ioremap error\n");
+               return -ENOMEM;
+       }
+
+       priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+       if (!priv) {
+               dev_err(dev, "priv data allocation error\n");
+               return -ENOMEM;
+       }
+
+       priv->reg0              = reg0;
+       priv->reg1              = reg1;
+       priv->counter           = 0;
+       priv->phy.dev           = dev;
+       priv->phy.label         = dev_name(dev);
+       priv->phy.init          = rcar_usb_phy_init;
+       priv->phy.shutdown      = rcar_usb_phy_shutdown;
+       spin_lock_init(&priv->lock);
+
+       ret = usb_add_phy(&priv->phy, USB_PHY_TYPE_USB2);
+       if (ret < 0) {
+               dev_err(dev, "usb phy addition error\n");
+               return ret;
+       }
+
+       platform_set_drvdata(pdev, priv);
+
+       return ret;
+}
+
+static int __devexit rcar_usb_phy_remove(struct platform_device *pdev)
+{
+       struct rcar_usb_phy_priv *priv = platform_get_drvdata(pdev);
+
+       usb_remove_phy(&priv->phy);
+
+       return 0;
+}
+
+static struct platform_driver rcar_usb_phy_driver = {
+       .driver         = {
+               .name   = "rcar_usb_phy",
+       },
+       .probe          = rcar_usb_phy_probe,
+       .remove         = __devexit_p(rcar_usb_phy_remove),
+};
+
+module_platform_driver(rcar_usb_phy_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Renesas R-Car USB phy");
+MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");