diff options
| author | Adrian Hunter <adrian.hunter@nokia.com> | 2010-02-15 18:03:34 (GMT) |
|---|---|---|
| committer | Tony Lindgren <tony@atomide.com> | 2010-02-15 18:03:34 (GMT) |
| commit | ce6f00165d5314698afd04ee20cede156cfcc593 (patch) | |
| tree | d7df468cf7143cdb99917b5de25a923c4abc2807 /arch/arm/mach-omap2/board-rx51-peripherals.c | |
| parent | e3df0fb4132fff8717cb0c08403c12138fd3ae39 (diff) | |
| download | linux-ce6f00165d5314698afd04ee20cede156cfcc593.tar.xz | |
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>
Diffstat (limited to 'arch/arm/mach-omap2/board-rx51-peripherals.c')
| -rw-r--r-- | arch/arm/mach-omap2/board-rx51-peripherals.c | 43 |
1 files changed, 42 insertions, 1 deletions
diff --git a/arch/arm/mach-omap2/board-rx51-peripherals.c b/arch/arm/mach-omap2/board-rx51-peripherals.c index ab07ca2..4377a4c 100644 --- a/arch/arm/mach-omap2/board-rx51-peripherals.c +++ b/arch/arm/mach-omap2/board-rx51-peripherals.c @@ -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 */ }; |