usb: renesas_usbhs: add R-Car Gen. 2 init and power control

In preparation for DT conversion to reduce reliance on platform device
callbacks.

Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/renesas_usbhs/Makefile

@@ -4,7 +4,7 @@
 
 obj-$(CONFIG_USB_RENESAS_USBHS)	+= renesas_usbhs.o
 
-renesas_usbhs-y			:= common.o mod.o pipe.o fifo.o
+renesas_usbhs-y			:= common.o mod.o pipe.o fifo.o rcar2.o
 
 ifneq ($(CONFIG_USB_RENESAS_USBHS_HCD),)
 	renesas_usbhs-y		+= mod_host.o

drivers/usb/renesas_usbhs/common.c

@@ -15,12 +15,14 @@
  *
  */
 #include <linux/err.h>
+#include <linux/gpio.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/pm_runtime.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
 #include "common.h"
+#include "rcar2.h"
 
 /*
  *		image of renesas_usbhs
@@ -284,6 +286,8 @@ static void usbhsc_set_buswait(struct usbhs_priv *priv)
 /*
  *		platform default param
  */
+
+/* commonly used on old SH-Mobile SoCs */
 static u32 usbhsc_default_pipe_type[] = {
 		USB_ENDPOINT_XFER_CONTROL,
 		USB_ENDPOINT_XFER_ISOC,
@@ -297,6 +301,26 @@ static u32 usbhsc_default_pipe_type[] = {
 		USB_ENDPOINT_XFER_INT,
 };
 
+/* commonly used on newer SH-Mobile and R-Car SoCs */
+static u32 usbhsc_new_pipe_type[] = {
+		USB_ENDPOINT_XFER_CONTROL,
+		USB_ENDPOINT_XFER_ISOC,
+		USB_ENDPOINT_XFER_ISOC,
+		USB_ENDPOINT_XFER_BULK,
+		USB_ENDPOINT_XFER_BULK,
+		USB_ENDPOINT_XFER_BULK,
+		USB_ENDPOINT_XFER_INT,
+		USB_ENDPOINT_XFER_INT,
+		USB_ENDPOINT_XFER_INT,
+		USB_ENDPOINT_XFER_BULK,
+		USB_ENDPOINT_XFER_BULK,
+		USB_ENDPOINT_XFER_BULK,
+		USB_ENDPOINT_XFER_BULK,
+		USB_ENDPOINT_XFER_BULK,
+		USB_ENDPOINT_XFER_BULK,
+		USB_ENDPOINT_XFER_BULK,
+};
+
 /*
  *		power control
  */
@@ -423,8 +447,7 @@ static int usbhs_probe(struct platform_device *pdev)
 	int ret;
 
 	/* check platform information */
-	if (!info ||
-	    !info->platform_callback.get_id) {
+	if (!info) {
 		dev_err(&pdev->dev, "no platform information\n");
 		return -EINVAL;
 	}
@@ -451,13 +474,32 @@ static int usbhs_probe(struct platform_device *pdev)
 	/*
 	 * care platform info
 	 */
-	memcpy(&priv->pfunc,
-	       &info->platform_callback,
-	       sizeof(struct renesas_usbhs_platform_callback));
+
 	memcpy(&priv->dparam,
 	       &info->driver_param,
 	       sizeof(struct renesas_usbhs_driver_param));
 
+	switch (priv->dparam.type) {
+	case USBHS_TYPE_R8A7790:
+	case USBHS_TYPE_R8A7791:
+		priv->pfunc = usbhs_rcar2_ops;
+		if (!priv->dparam.pipe_type) {
+			priv->dparam.pipe_type = usbhsc_new_pipe_type;
+			priv->dparam.pipe_size =
+				ARRAY_SIZE(usbhsc_new_pipe_type);
+		}
+		break;
+	default:
+		if (!info->platform_callback.get_id) {
+			dev_err(&pdev->dev, "no platform callbacks");
+			return -EINVAL;
+		}
+		memcpy(&priv->pfunc,
+		       &info->platform_callback,
+		       sizeof(struct renesas_usbhs_platform_callback));
+		break;
+	}
+
 	/* set driver callback functions for platform */
 	dfunc			= &info->driver_callback;
 	dfunc->notify_hotplug	= usbhsc_drvcllbck_notify_hotplug;
@@ -507,6 +549,20 @@ static int usbhs_probe(struct platform_device *pdev)
 	 */
 	usbhs_sys_clock_ctrl(priv, 0);
 
+	/* check GPIO determining if USB function should be enabled */
+	if (priv->dparam.enable_gpio) {
+		gpio_request_one(priv->dparam.enable_gpio, GPIOF_IN, NULL);
+		ret = !gpio_get_value(priv->dparam.enable_gpio);
+		gpio_free(priv->dparam.enable_gpio);
+		if (ret) {
+			dev_warn(&pdev->dev,
+				 "USB function not selected (GPIO %d)\n",
+				 priv->dparam.enable_gpio);
+			ret = -ENOTSUPP;
+			goto probe_end_mod_exit;
+		}
+	}
+
 	/*
 	 * platform call
 	 *

drivers/usb/renesas_usbhs/common.h

@@ -268,6 +268,8 @@ struct usbhs_priv {
 	 * fifo control
 	 */
 	struct usbhs_fifo_info fifo_info;
+
+	struct usb_phy *phy;
 };
 
 /*

drivers/usb/renesas_usbhs/rcar2.c

@@ -0,0 +1,77 @@
+/*
+ * Renesas USB driver R-Car Gen. 2 initialization and power control
+ *
+ * Copyright (C) 2014 Ulrich Hecht
+ *
+ * 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/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_data/gpio-rcar.h>
+#include <linux/usb/phy.h>
+#include "common.h"
+#include "rcar2.h"
+
+static int usbhs_rcar2_hardware_init(struct platform_device *pdev)
+{
+	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
+	struct usb_phy *phy;
+
+	phy = usb_get_phy_dev(&pdev->dev, 0);
+	if (IS_ERR(phy))
+		return PTR_ERR(phy);
+
+	priv->phy = phy;
+	return 0;
+}
+
+static int usbhs_rcar2_hardware_exit(struct platform_device *pdev)
+{
+	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
+
+	if (!priv->phy)
+		return 0;
+
+	usb_put_phy(priv->phy);
+	priv->phy = NULL;
+
+	return 0;
+}
+
+static int usbhs_rcar2_power_ctrl(struct platform_device *pdev,
+				void __iomem *base, int enable)
+{
+	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
+
+	if (!priv->phy)
+		return -ENODEV;
+
+	if (enable) {
+		int retval = usb_phy_init(priv->phy);
+
+		if (!retval)
+			retval = usb_phy_set_suspend(priv->phy, 0);
+		return retval;
+	}
+
+	usb_phy_set_suspend(priv->phy, 1);
+	usb_phy_shutdown(priv->phy);
+	return 0;
+}
+
+static int usbhs_rcar2_get_id(struct platform_device *pdev)
+{
+	return USBHS_GADGET;
+}
+
+const struct renesas_usbhs_platform_callback usbhs_rcar2_ops = {
+	.hardware_init = usbhs_rcar2_hardware_init,
+	.hardware_exit = usbhs_rcar2_hardware_exit,
+	.power_ctrl = usbhs_rcar2_power_ctrl,
+	.get_id = usbhs_rcar2_get_id,
+};

drivers/usb/renesas_usbhs/rcar2.h

@@ -0,0 +1,4 @@
+#include "common.h"
+
+extern const struct renesas_usbhs_platform_callback
+	usbhs_rcar2_ops;

include/linux/usb/renesas_usbhs.h

@@ -153,13 +153,19 @@ struct renesas_usbhs_driver_param {
 	 */
 	int pio_dma_border; /* default is 64byte */
 
+	u32 type;
+	u32 enable_gpio;
+
 	/*
 	 * option:
 	 */
 	u32 has_otg:1; /* for controlling PWEN/EXTLP */
 	u32 has_sudmac:1; /* for SUDMAC */
 };
 
+#define USBHS_TYPE_R8A7790 1
+#define USBHS_TYPE_R8A7791 2
+
 /*
  * option:
  *