ARM: OMAP3: Add support for configuring MMC pins as GPIO pins
Some devices are using the MMC1 pins 4..8 as GPIO pins, and in
this case they need to be configured for 1.8V IO voltage if not
done by the bootloader as otherwise some devices like smsc911x
won't work properly.
Let's also make sure this register is saved and restored for
idle.
Cc: Tim Nordell <tim.nordell@logicpd.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/pdata-quirks.c b/arch/arm/mach-omap2/pdata-quirks.c
index af11511..821171c 100644
--- a/arch/arm/mach-omap2/pdata-quirks.c
+++ b/arch/arm/mach-omap2/pdata-quirks.c
@@ -44,6 +44,27 @@
#endif
#ifdef CONFIG_ARCH_OMAP3
+/*
+ * Configures GPIOs 126, 127 and 129 to 1.8V mode instead of 3.0V
+ * mode for MMC1 in case bootloader did not configure things.
+ * Note that if the pins are used for MMC1, pbias-regulator
+ * manages the IO voltage.
+ */
+static void __init omap3_gpio126_127_129(void)
+{
+ u32 reg;
+
+ reg = omap_ctrl_readl(OMAP343X_CONTROL_PBIAS_LITE);
+ reg &= ~OMAP343X_PBIASLITEVMODE1;
+ reg |= OMAP343X_PBIASLITEPWRDNZ1;
+ omap_ctrl_writel(reg, OMAP343X_CONTROL_PBIAS_LITE);
+ if (cpu_is_omap3630()) {
+ reg = omap_ctrl_readl(OMAP34XX_CONTROL_WKUP_CTRL);
+ reg |= OMAP36XX_GPIO_IO_PWRDNZ;
+ omap_ctrl_writel(reg, OMAP34XX_CONTROL_WKUP_CTRL);
+ }
+}
+
static void __init hsmmc2_internal_input_clk(void)
{
u32 reg;
@@ -356,6 +377,7 @@
{ "nokia,omap3-n950", hsmmc2_internal_input_clk, },
{ "isee,omap3-igep0020-rev-f", omap3_igep0020_rev_f_legacy_init, },
{ "isee,omap3-igep0030-rev-g", omap3_igep0030_rev_g_legacy_init, },
+ { "logicpd,dm3730-torpedo-devkit", omap3_gpio126_127_129, },
{ "ti,omap3-evm-37xx", omap3_evm_legacy_init, },
{ "ti,am3517-evm", am3517_evm_legacy_init, },
{ "technexion,omap3-tao3530", omap3_tao3530_legacy_init, },