From 5ba95541b700d2edecb4d97d4b905f51ed8551b3 Mon Sep 17 00:00:00 2001 From: Felipe Balbi Date: Mon, 23 Jun 2014 17:18:24 -0500 Subject: usb: phy: omap_usb_phy: implement usb_phy_power() for AM437x Newer AM437x silicon requires us to explicitly power up the USB2 PHY. By implementing usb_phy_power() we can achieve that. Signed-off-by: Felipe Balbi --- arch/arm/include/asm/arch-am33xx/hardware_am43xx.h | 5 +++++ drivers/usb/phy/omap_usb_phy.c | 17 ++++++++++++++++- 2 files changed, 21 insertions(+), 1 deletion(-) diff --git a/arch/arm/include/asm/arch-am33xx/hardware_am43xx.h b/arch/arm/include/asm/arch-am33xx/hardware_am43xx.h index b470319249..efdecf4613 100644 --- a/arch/arm/include/asm/arch-am33xx/hardware_am43xx.h +++ b/arch/arm/include/asm/arch-am33xx/hardware_am43xx.h @@ -43,6 +43,11 @@ #define VTP0_CTRL_ADDR 0x44E10E0C #define VTP1_CTRL_ADDR 0x48140E10 +/* USB CTRL Base Address */ +#define USB1_CTRL 0x44e10628 +#define USB1_CTRL_CM_PWRDN BIT(0) +#define USB1_CTRL_OTG_PWRDN BIT(1) + /* DDR Base address */ #define DDR_PHY_CMD_ADDR 0x44E12000 #define DDR_PHY_DATA_ADDR 0x44E120C8 diff --git a/drivers/usb/phy/omap_usb_phy.c b/drivers/usb/phy/omap_usb_phy.c index af46db2edd..f78d532966 100644 --- a/drivers/usb/phy/omap_usb_phy.c +++ b/drivers/usb/phy/omap_usb_phy.c @@ -222,7 +222,22 @@ static void am437x_enable_usb2_phy2(struct omap_xhci *omap) void usb_phy_power(int on) { - return; + u32 val; + + /* USB1_CTRL */ + val = readl(USB1_CTRL); + if (on) { + /* + * these bits are re-used on AM437x to power up/down the USB + * CM and OTG PHYs, if we don't toggle them, USB will not be + * functional on newer silicon revisions + */ + val &= ~(USB1_CTRL_CM_PWRDN | USB1_CTRL_OTG_PWRDN); + } else { + val |= USB1_CTRL_CM_PWRDN | USB1_CTRL_OTG_PWRDN; + } + + writel(val, USB1_CTRL); } #endif /* CONFIG_AM437X_USB2PHY2_HOST */ -- cgit v1.2.1