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omap: RX51: Remux to pull eMMC lines down when powering off 

It has been discovered that, when eMMC is powered off, current
will flow from OMAP eMMC data pull-ups to the eMMC voltage supply.
Configuring pads for OMAP off-mode does not help because eMMC is
powered off independently of OMAP off-mode.  Hence the pads are
now re-configured when eMMC is powered on or off.

Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Adrian Hunter 2010-02-15 10:03:34 -08:00 committed by Tony Lindgren
parent e3df0fb413
commit ce6f00165d
4 changed files with 53 additions and 1 deletions
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43
arch/arm/mach-omap2/board-rx51-peripherals.c
View File

@ -209,6 +209,46 @@ static struct twl4030_madc_platform_data rx51_madc_data = {
.irq_line = 1,
};
/* Enable input logic and pull all lines up when eMMC is on. */
static struct omap_board_mux rx51_mmc2_on_mux[] = {
OMAP3_MUX(SDMMC2_CMD, OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0),
OMAP3_MUX(SDMMC2_DAT0, OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0),
OMAP3_MUX(SDMMC2_DAT1, OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0),
OMAP3_MUX(SDMMC2_DAT2, OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0),
OMAP3_MUX(SDMMC2_DAT3, OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0),
OMAP3_MUX(SDMMC2_DAT4, OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0),
OMAP3_MUX(SDMMC2_DAT5, OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0),
OMAP3_MUX(SDMMC2_DAT6, OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0),
OMAP3_MUX(SDMMC2_DAT7, OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0),
{ .reg_offset = OMAP_MUX_TERMINATOR },
};
/* Disable input logic and pull all lines down when eMMC is off. */
static struct omap_board_mux rx51_mmc2_off_mux[] = {
OMAP3_MUX(SDMMC2_CMD, OMAP_PULL_ENA | OMAP_MUX_MODE0),
OMAP3_MUX(SDMMC2_DAT0, OMAP_PULL_ENA | OMAP_MUX_MODE0),
OMAP3_MUX(SDMMC2_DAT1, OMAP_PULL_ENA | OMAP_MUX_MODE0),
OMAP3_MUX(SDMMC2_DAT2, OMAP_PULL_ENA | OMAP_MUX_MODE0),
OMAP3_MUX(SDMMC2_DAT3, OMAP_PULL_ENA | OMAP_MUX_MODE0),
OMAP3_MUX(SDMMC2_DAT4, OMAP_PULL_ENA | OMAP_MUX_MODE0),
OMAP3_MUX(SDMMC2_DAT5, OMAP_PULL_ENA | OMAP_MUX_MODE0),
OMAP3_MUX(SDMMC2_DAT6, OMAP_PULL_ENA | OMAP_MUX_MODE0),
OMAP3_MUX(SDMMC2_DAT7, OMAP_PULL_ENA | OMAP_MUX_MODE0),
{ .reg_offset = OMAP_MUX_TERMINATOR },
};
/*
* Current flows to eMMC when eMMC is off and the data lines are pulled up,
* so pull them down. N.B. we pull 8 lines because we are using 8 lines.
*/
static void rx51_mmc2_remux(struct device *dev, int slot, int power_on)
{
if (power_on)
omap_mux_write_array(rx51_mmc2_on_mux);
else
omap_mux_write_array(rx51_mmc2_off_mux);
}
static struct omap2_hsmmc_info mmc[] __initdata = {
{
.name = "external",
@ -222,11 +262,12 @@ static struct omap2_hsmmc_info mmc[] __initdata = {
{
.name = "internal",
.mmc = 2,
.wires = 8,
.wires = 8, /* See also rx51_mmc2_remux */
.gpio_cd = -EINVAL,
.gpio_wp = -EINVAL,
.nonremovable = true,
.power_saving = true,
.remux = rx51_mmc2_remux,
},
{} /* Terminator */
};

8
arch/arm/mach-omap2/hsmmc.c
View File

@ -48,6 +48,9 @@ static void hsmmc1_before_set_reg(struct device *dev, int slot,
u32 reg, prog_io;
struct omap_mmc_platform_data *mmc = dev->platform_data;
if (mmc->slots[0].remux)
mmc->slots[0].remux(dev, slot, power_on);
/*
* Assume we power both OMAP VMMC1 (for CMD, CLK, DAT0..3) and the
* card with Vcc regulator (from twl4030 or whatever). OMAP has both
@ -121,6 +124,9 @@ static void hsmmc23_before_set_reg(struct device *dev, int slot,
{
struct omap_mmc_platform_data *mmc = dev->platform_data;
if (mmc->slots[0].remux)
mmc->slots[0].remux(dev, slot, power_on);
if (power_on) {
/* Only MMC2 supports a CLKIN */
if (mmc->slots[0].internal_clock) {
@ -185,6 +191,8 @@ void __init omap2_hsmmc_init(struct omap2_hsmmc_info *controllers)
mmc->slots[0].switch_pin = c->gpio_cd;
mmc->slots[0].gpio_wp = c->gpio_wp;
mmc->slots[0].remux = c->remux;
if (c->cover_only)
mmc->slots[0].cover = 1;

2
arch/arm/mach-omap2/hsmmc.h
View File

@ -19,6 +19,8 @@ struct omap2_hsmmc_info {
char *name; /* or NULL for default */
struct device *dev; /* returned: pointer to mmc adapter */
int ocr_mask; /* temporary HACK */
/* Remux (pad configuation) when powering on/off */
void (*remux)(struct device *dev, int slot, int power_on);
};
#if defined(CONFIG_MMC_OMAP_HS) || defined(CONFIG_MMC_OMAP_HS_MODULE)

1
arch/arm/plat-omap/include/plat/mmc.h
View File

@ -105,6 +105,7 @@ struct omap_mmc_platform_data {
int (*get_ro)(struct device *dev, int slot);
int (*set_sleep)(struct device *dev, int slot, int sleep,
int vdd, int cardsleep);
void (*remux)(struct device *dev, int slot, int power_on);
/* Call back before enabling / disabling regulators */
void (*before_set_reg)(struct device *dev, int slot,
int power_on, int vdd);