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authorTony Lindgren <tony@atomide.com>2015-05-20 19:23:43 +0300
committerTony Lindgren <tony@atomide.com>2015-05-20 19:23:43 +0300
commitb96b332fd518cd4d08104bc5ca552ac1ade7e2c7 (patch)
tree6356e47f5d443a636cbe2b786561f44625bd27bb /arch/arm/mach-omap2/pdata-quirks.c
parentb787f68c36d49bb1d9236f403813641efa74a031 (diff)
downloadlinux-b96b332fd518cd4d08104bc5ca552ac1ade7e2c7.tar.xz
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>
Diffstat (limited to 'arch/arm/mach-omap2/pdata-quirks.c')
-rw-r--r--arch/arm/mach-omap2/pdata-quirks.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/pdata-quirks.c b/arch/arm/mach-omap2/pdata-quirks.c
index af11511dda50..821171cf6b7d 100644
--- a/arch/arm/mach-omap2/pdata-quirks.c
+++ b/arch/arm/mach-omap2/pdata-quirks.c
@@ -44,6 +44,27 @@ static void __init omap2420_n8x0_legacy_init(void)
#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 @@ static struct pdata_init pdata_quirks[] __initdata = {
{ "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, },