[U-Boot] [PATCH 4/6 V3] EXYNOS: Add power Enable/Disable for USB-EHCI

[Rajeshwari Shinde]

This patch adds functions to enable/disable the power of USB
host controller for EXYNOS5.

Signed-off-by: Vivek Gautam <gautam.vivek at samsung.com>
Signed-off-by: Che-Liang Chiou <clchiou at chromium.org>
Signed-off-by: Rajeshwari Shinde <rajeshwari.s at samsung.com>
---
Chnages in v2:
	- Removed setting of SYSREG registers and moved to system.c.
	- Enabling and Disabling of USB_PHY_CTRL was moved to single function.
Changes in v3:
	- Removed function to set PS_HOLD as it was not required for USB.
	- Renamed power_enable_usb_phy and exynos5_enable_usb_phy to
	set_usb_phy_ctrl and exynos5_set_usb_phy_ctrl.
	- Added defination for POWER_USB_HOST_PHY_CTRL_DISABLE.
This patch is based on:
USB: EXYNOS: Add ehci support.patch
 arch/arm/cpu/armv7/exynos/power.c        |   22 ++++++++++++++++++++++
 arch/arm/include/asm/arch-exynos/power.h |    4 ++++
 drivers/usb/host/ehci-exynos.c           |    5 +++++
 3 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/arch/arm/cpu/armv7/exynos/power.c b/arch/arm/cpu/armv7/exynos/power.c
index c765304..e09917f 100644
--- a/arch/arm/cpu/armv7/exynos/power.c
+++ b/arch/arm/cpu/armv7/exynos/power.c
@@ -52,3 +52,25 @@ void set_mipi_phy_ctrl(unsigned int dev_index, unsigned int enable)
 	if (cpu_is_exynos4())
 		exynos4_mipi_phy_control(dev_index, enable);
 }
+
+void exynos5_set_usb_phy_ctrl(unsigned int enable)
+{
+	struct exynos5_power *power =
+		(struct exynos5_power *)samsung_get_base_power();
+
+	if (enable) {
+		/* Enabling USBHOST_PHY */
+		setbits_le32(&power->usbhost_phy_control,
+				POWER_USB_HOST_PHY_CTRL_EN);
+	} else {
+		/* Disabling USBHOST_PHY */
+		clrbits_le32(&power->usbhost_phy_control,
+				POWER_USB_HOST_PHY_CTRL_EN);
+	}
+}
+
+void set_usb_phy_ctrl(unsigned int enable)
+{
+	if (cpu_is_exynos5())
+		exynos5_set_usb_phy_ctrl(enable);
+}
diff --git a/arch/arm/include/asm/arch-exynos/power.h b/arch/arm/include/asm/arch-exynos/power.h
index 4236beb..30aba16 100644
--- a/arch/arm/include/asm/arch-exynos/power.h
+++ b/arch/arm/include/asm/arch-exynos/power.h
@@ -855,4 +855,8 @@ void set_mipi_phy_ctrl(unsigned int dev_index, unsigned int enable);
 #define EXYNOS_MIPI_PHY_SRESETN		(1 << 1)
 #define EXYNOS_MIPI_PHY_MRESETN		(1 << 2)
 
+void set_usb_phy_ctrl(unsigned int enable);
+
+#define POWER_USB_HOST_PHY_CTRL_EN		(1 << 0)
+#define POWER_USB_HOST_PHY_CTRL_DISABLE		(0 << 0)
 #endif
diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
index 90d66d3..093b13d 100644
--- a/drivers/usb/host/ehci-exynos.c
+++ b/drivers/usb/host/ehci-exynos.c
@@ -25,6 +25,7 @@
 #include <asm/arch/cpu.h>
 #include <asm/arch/ehci.h>
 #include <asm/arch/system.h>
+#include <asm/arch/power.h>
 #include "ehci.h"
 #include "ehci-core.h"
 
@@ -33,6 +34,8 @@ static void setup_usb_phy(struct exynos_usb_phy *usb)
 {
 	set_usbhost_mode(USB20_PHY_CFG_HOST_LINK_EN);
 
+	set_usb_phy_ctrl(POWER_USB_HOST_PHY_CTRL_EN);
+
 	clrbits_le32(&usb->usbphyctrl0,
 			HOST_CTRL0_FSEL_MASK |
 			HOST_CTRL0_COMMONON_N |
@@ -73,6 +76,8 @@ static void reset_usb_phy(struct exynos_usb_phy *usb)
 			HOST_CTRL0_SIDDQ |
 			HOST_CTRL0_FORCESUSPEND |
 			HOST_CTRL0_FORCESLEEP);
+
+	set_usb_phy_ctrl(POWER_USB_HOST_PHY_CTRL_DISABLE);
 }
 
 /*
-- 
1.7.4.4