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@xxxxxxxxxxx>
---
v5 -> v6
- used if (priv->counter++ == 0)
- used if (priv->counter-- == 1)
- fixup missing "*"
- fixup macro prefix
- fixup __devexit
But as I explained before, this driver can't use devm_request_and_ioremap(),
because this Renesas R-Car PHY address has strange mapping.
Some registers of this PHY address are mapped to crevice of USB EHCI/OHCI register area.
like below, so I added /* CAUTION */ to explain why it didn't use devm_request_and_ioremap()
0xAAAA0000 ===========
EHCI
0xAAAA0094 PHY
0xAAAA009C PHY
EHCI
0xAAAA0400 ==========
...
0xAAAA0800 ==========
PHY
0xAAAA0900 ==========
drivers/usb/phy/Kconfig | 12 +++
drivers/usb/phy/Makefile | 1 +
drivers/usb/phy/rcar-phy.c | 220 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 233 insertions(+)
create mode 100644 drivers/usb/phy/rcar-phy.c
diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index 63c339b..7eb73c5 100644
--- 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 b069f29..1a579a8 100644
--- 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
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@xxxxxxxxxxx>
+ *
+ * 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@xxxxxxxxxxx>");
--
1.7.9.5
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