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| author | Paul Mundt <lethal@linux-sh.org> | 2012-01-12 08:11:43 +0400 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2012-01-12 08:11:43 +0400 |
| commit | b1bdd255661369cb6eb90b6e181169b5e6d0f9b6 (patch) | |
| tree | 17d15f3a6dc5bdd6205070dbef0e339421b13d25 /arch/arm/mach-exynos/setup-usb-phy.c | |
| parent | 9d14070f656addddce3d63fd483de46930b51850 (diff) | |
| parent | c1537b4863da620f12f5b42ece61bf65314148ed (diff) | |
| download | linux-b1bdd255661369cb6eb90b6e181169b5e6d0f9b6.tar.xz | |
Merge branch 'sh/nommu' into sh-latest
Diffstat (limited to 'arch/arm/mach-exynos/setup-usb-phy.c')
| -rw-r--r-- | arch/arm/mach-exynos/setup-usb-phy.c | 15 |
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 39aca045f660..41743d21e8c6 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"); |