From: Adam Ford aford173@gmail.com
On the OMAP36xx/37xx the CONTROL_WKUP_CTRL register has a field (bit 6) named GPIO_IO_PWRDNZ. If 0, the IO buffers which are related to GPIO_126, 127 and 129 are disabled. Some boards may need this for MMC. After the PBIAS is configured, this bit should be set high to enable these GPIO pins.
Signed-off-by: Adam Ford aford173@gmail.com
--- V4: Fixed some spacing and remove a warning when compiling on board not using the new #define CONFIG_MMC_OMAP36XX_PINS V3: The OMAP36xx datasheet states to clear this bit before changing PBIAS, so this update clears the bit before changing it. This patch also makes the option dependant on MMC_OMAP_HS. V2: Make this feature a config option and add it to the MMC section of the Kconfig. This allows the precompiler to only include it in a small handfull of OMAP36XX and 37XX boards using MMC1.
diff --git a/configs/omap3_logic_defconfig b/configs/omap3_logic_defconfig index f200e87..37ee267 100644 --- a/configs/omap3_logic_defconfig +++ b/configs/omap3_logic_defconfig @@ -33,6 +33,7 @@ CONFIG_CMD_UBI=y CONFIG_ISO_PARTITION=y CONFIG_EFI_PARTITION=y CONFIG_MMC_OMAP_HS=y +CONFIG_MMC_OMAP36XX_PINS=y CONFIG_SYS_NS16550=y CONFIG_USB=y CONFIG_USB_MUSB_GADGET=y diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig index 0c07781..01d1dbf 100644 --- a/drivers/mmc/Kconfig +++ b/drivers/mmc/Kconfig @@ -131,6 +131,18 @@ config MMC_OMAP_HS
If unsure, say N.
+config MMC_OMAP36XX_PINS + bool "Enable MMC1 on OMAP36xx/37xx" + depends on OMAP34XX && MMC_OMAP_HS + help + This enables extended-drain in the MMC/SD/SDIO1I/O and + GPIO-associated I/O cells (gpio_126, gpio_127, and gpio_129) + specific to the OMAP36xx/37xx using MMC1 + + If you have a controller with this interface, say Y here. + + If unsure, say N. + config SH_SDHI bool "SuperH/Renesas ARM SoCs on-chip SDHI host controller support" depends on RMOBILE diff --git a/drivers/mmc/omap_hsmmc.c b/drivers/mmc/omap_hsmmc.c index b326846..07ab9d7 100644 --- a/drivers/mmc/omap_hsmmc.c +++ b/drivers/mmc/omap_hsmmc.c @@ -38,6 +38,7 @@ #include <asm/arch/sys_proto.h> #endif #include <dm.h> +#include <asm/arch-omap3/mux.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -102,6 +103,9 @@ static unsigned char mmc_board_init(struct mmc *mmc) t2_t *t2_base = (t2_t *)T2_BASE; struct prcm *prcm_base = (struct prcm *)PRCM_BASE; u32 pbias_lite; +#ifdef CONFIG_MMC_OMAP36XX_PINS + u32 wkup_ctrl = readl(OMAP34XX_CTRL_WKUP_CTRL); +#endif
pbias_lite = readl(&t2_base->pbias_lite); pbias_lite &= ~(PBIASLITEPWRDNZ1 | PBIASLITEPWRDNZ0); @@ -109,12 +113,26 @@ static unsigned char mmc_board_init(struct mmc *mmc) /* for cairo board, we need to set up 1.8 Volt bias level on MMC1 */ pbias_lite &= ~PBIASLITEVMODE0; #endif +#ifdef CONFIG_MMC_OMAP36XX_PINS + if (get_cpu_family() == CPU_OMAP36XX) { + /* Disable extended drain IO before changing PBIAS */ + wkup_ctrl &= ~OMAP34XX_CTRL_WKUP_CTRL_GPIO_IO_PWRDNZ; + writel(wkup_ctrl, OMAP34XX_CTRL_WKUP_CTRL); + } +#endif writel(pbias_lite, &t2_base->pbias_lite);
writel(pbias_lite | PBIASLITEPWRDNZ1 | PBIASSPEEDCTRL0 | PBIASLITEPWRDNZ0, &t2_base->pbias_lite);
+#ifdef CONFIG_MMC_OMAP36XX_PINS + if (get_cpu_family() == CPU_OMAP36XX) + /* Enable extended drain IO after changing PBIAS */ + writel(wkup_ctrl | + OMAP34XX_CTRL_WKUP_CTRL_GPIO_IO_PWRDNZ, + OMAP34XX_CTRL_WKUP_CTRL); +#endif writel(readl(&t2_base->devconf0) | MMCSDIO1ADPCLKISEL, &t2_base->devconf0);