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ARM: OMAP3: Add support for configuring MMC pins as GPIO pins

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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>
This commit is contained in:
Tony Lindgren
2015-05-20 09:23:43 -07:00
parent b787f68c36
commit b96b332fd5
3 changed files with 28 additions and 0 deletions
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22
arch/arm/mach-omap2/pdata-quirks.c
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@@ -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, },