ARM: EXYNOS: Add USB OHCI device

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/arch/arm/mach-exynos/setup-usb-phy.c b/arch/arm/mach-exynos/setup-usb-phy.c
index 39aca045f66..41743d21e8c 100644
--- a/arch/arm/mach-exynos/setup-usb-phy.c
+++ b/arch/arm/mach-exynos/setup-usb-phy.c
@@ -19,6 +19,13 @@
 #include <plat/cpu.h>
 #include <plat/usb-phy.h>
 
+static atomic_t host_usage;
+
+static int exynos4_usb_host_phy_is_on(void)
+{
+        return (readl(EXYNOS4_PHYPWR) & PHY1_STD_ANALOG_POWERDOWN) ? 0 : 1;
+}
+
 static int exynos4_usb_phy1_init(struct platform_device *pdev)
 {
         struct clk *otg_clk;
@@ -27,6 +34,8 @@ static int exynos4_usb_phy1_init(struct platform_device *pdev)
         u32 rstcon;
         int err;
 
+        atomic_inc(&host_usage);
+
         otg_clk = clk_get(&pdev->dev, "otg");
         if (IS_ERR(otg_clk)) {
                 dev_err(&pdev->dev, "Failed to get otg clock\n");
@@ -39,6 +48,9 @@ static int exynos4_usb_phy1_init(struct platform_device *pdev)
                 return err;
         }
 
+        if (exynos4_usb_host_phy_is_on())
+                return 0;
+
         writel(readl(S5P_USBHOST_PHY_CONTROL) | S5P_USBHOST_PHY_ENABLE,
                         S5P_USBHOST_PHY_CONTROL);
 
@@ -95,6 +107,9 @@ static int exynos4_usb_phy1_exit(struct platform_device *pdev)
         struct clk *otg_clk;
         int err;
 
+        if (atomic_dec_return(&host_usage) > 0)
+                return 0;
+
         otg_clk = clk_get(&pdev->dev, "otg");
         if (IS_ERR(otg_clk)) {
                 dev_err(&pdev->dev, "Failed to get otg clock\n");