usb: renesas_usbhs: add R-Car Gen3 power control

Since the usb2 phy driver for gen3 (phy-rcar-gen3-usb2) cannot access
LPSTS and UGCTRL2 registers in the HSUSB module, this driver have to
initialize the registers. So, this patch adds such handling code into
rcar3.c.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

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 rcar2.o
+renesas_usbhs-y			:= common.o mod.o pipe.o fifo.o rcar2.o rcar3.o
 
 ifneq ($(CONFIG_USB_RENESAS_USBHS_HCD),)
 	renesas_usbhs-y		+= mod_host.o

drivers/usb/renesas_usbhs/common.c

@@ -25,6 +25,7 @@
 #include <linux/sysfs.h>
 #include "common.h"
 #include "rcar2.h"
+#include "rcar3.h"
 
 /*
  *		image of renesas_usbhs
@@ -477,18 +478,16 @@ static const struct of_device_id usbhs_of_match[] = {
 		.data = (void *)USBHS_TYPE_RCAR_GEN2,
 	},
 	{
-		/* Gen3 is compatible with Gen2 */
 		.compatible = "renesas,usbhs-r8a7795",
-		.data = (void *)USBHS_TYPE_RCAR_GEN2,
+		.data = (void *)USBHS_TYPE_RCAR_GEN3,
 	},
 	{
 		.compatible = "renesas,rcar-gen2-usbhs",
 		.data = (void *)USBHS_TYPE_RCAR_GEN2,
 	},
 	{
-		/* Gen3 is compatible with Gen2 */
 		.compatible = "renesas,rcar-gen3-usbhs",
-		.data = (void *)USBHS_TYPE_RCAR_GEN2,
+		.data = (void *)USBHS_TYPE_RCAR_GEN3,
 	},
 	{ },
 };
@@ -578,6 +577,13 @@ static int usbhs_probe(struct platform_device *pdev)
 			priv->dparam.pipe_size = ARRAY_SIZE(usbhsc_new_pipe);
 		}
 		break;
+	case USBHS_TYPE_RCAR_GEN3:
+		priv->pfunc = usbhs_rcar3_ops;
+		if (!priv->dparam.pipe_configs) {
+			priv->dparam.pipe_configs = usbhsc_new_pipe;
+			priv->dparam.pipe_size = ARRAY_SIZE(usbhsc_new_pipe);
+		}
+		break;
 	default:
 		if (!info->platform_callback.get_id) {
 			dev_err(&pdev->dev, "no platform callbacks");

drivers/usb/renesas_usbhs/rcar3.c

@@ -0,0 +1,54 @@
+/*
+ * Renesas USB driver R-Car Gen. 3 initialization and power control
+ *
+ * Copyright (C) 2016 Renesas Electronics Corporation
+ *
+ * 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/io.h>
+#include "common.h"
+#include "rcar3.h"
+
+#define LPSTS		0x102
+#define UGCTRL2		0x184	/* 32-bit register */
+
+/* Low Power Status register (LPSTS) */
+#define LPSTS_SUSPM	0x4000
+
+/* USB General control register 2 (UGCTRL2), bit[31:6] should be 0 */
+#define UGCTRL2_RESERVED_3	0x00000001	/* bit[3:0] should be B'0001 */
+#define UGCTRL2_USB0SEL_OTG	0x00000030
+
+void usbhs_write32(struct usbhs_priv *priv, u32 reg, u32 data)
+{
+	iowrite32(data, priv->base + reg);
+}
+
+static int usbhs_rcar3_power_ctrl(struct platform_device *pdev,
+				void __iomem *base, int enable)
+{
+	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
+
+	usbhs_write32(priv, UGCTRL2, UGCTRL2_RESERVED_3 | UGCTRL2_USB0SEL_OTG);
+
+	if (enable)
+		usbhs_bset(priv, LPSTS, LPSTS_SUSPM, LPSTS_SUSPM);
+	else
+		usbhs_bset(priv, LPSTS, LPSTS_SUSPM, 0);
+
+	return 0;
+}
+
+static int usbhs_rcar3_get_id(struct platform_device *pdev)
+{
+	return USBHS_GADGET;
+}
+
+const struct renesas_usbhs_platform_callback usbhs_rcar3_ops = {
+	.power_ctrl = usbhs_rcar3_power_ctrl,
+	.get_id = usbhs_rcar3_get_id,
+};

drivers/usb/renesas_usbhs/rcar3.h

@@ -0,0 +1,3 @@
+#include "common.h"
+
+extern const struct renesas_usbhs_platform_callback usbhs_rcar3_ops;

include/linux/usb/renesas_usbhs.h

@@ -184,6 +184,7 @@ struct renesas_usbhs_driver_param {
 };
 
 #define USBHS_TYPE_RCAR_GEN2	1
+#define USBHS_TYPE_RCAR_GEN3	2
 
 /*
  * option: