From 6aca17c9b7e8d311c86d4cf54daef65bdf68ef73 Mon Sep 17 00:00:00 2001 From: Adam Ford Date: Mon, 6 Feb 2017 11:31:43 -0600 Subject: drivers: mmc: omap_hsmmc: Fix IO Buffer on OMAP36xx 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 Reviewed-by: Tom Rini --- drivers/mmc/omap_hsmmc.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'drivers/mmc/omap_hsmmc.c') diff --git a/drivers/mmc/omap_hsmmc.c b/drivers/mmc/omap_hsmmc.c index 5bb628d125..b63ce565f2 100644 --- a/drivers/mmc/omap_hsmmc.c +++ b/drivers/mmc/omap_hsmmc.c @@ -38,6 +38,7 @@ #include #endif #include +#include DECLARE_GLOBAL_DATA_PTR; @@ -102,12 +103,22 @@ 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); #ifdef CONFIG_TARGET_OMAP3_CAIRO /* 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); @@ -115,6 +126,13 @@ static unsigned char mmc_board_init(struct mmc *mmc) 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); -- cgit v1.2.3