From 6aca17c9b7e8d311c86d4cf54daef65bdf68ef73 Mon Sep 17 00:00:00 2001
From: Adam Ford <aford173@gmail.com>
Date: Mon, 6 Feb 2017 11:31:43 -0600
Subject: [PATCH] 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 <aford173@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
---
configs/omap3_logic_defconfig | 1 +
drivers/mmc/Kconfig | 12 ++++++++++++
drivers/mmc/omap_hsmmc.c | 18 ++++++++++++++++++
3 files changed, 31 insertions(+)
diff --git a/configs/omap3_logic_defconfig b/configs/omap3_logic_defconfig
index f200e87a38..37ee267037 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 0c07781115..01d1dbfb1b 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 5bb628d125..b63ce565f2 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;
@@ -102,12 +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);
--
2.39.5