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| author | Stephen Warren <swarren@nvidia.com> | 2014-04-22 14:37:54 -0600 |
|---|---|---|
| committer | Tom Warren <twarren@nvidia.com> | 2014-05-13 10:41:31 -0700 |
| commit | bb14469ae088682859411e45573d01ed11373960 (patch) | |
| tree | fe8e32d6d1980309df19f0450fd099a59a4973aa /arch/arm/cpu | |
| parent | eceb3f26f407d65dae3902180b3c9f3128f0f349 (diff) | |
| download | u-boot-imx-bb14469ae088682859411e45573d01ed11373960.zip u-boot-imx-bb14469ae088682859411e45573d01ed11373960.tar.gz u-boot-imx-bb14469ae088682859411e45573d01ed11373960.tar.bz2 | |
ARM: tegra: add function to enable input clamping on tristate
The HW-defined procedure for booting Tegra requires that
CLAMP_INPUTS_WHEN_TRISTATED be enabled before programming the pinmux.
Add a function to the pinmux driver to allow boards to do this.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
Diffstat (limited to 'arch/arm/cpu')
| -rw-r--r-- | arch/arm/cpu/tegra-common/pinmux-common.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/arm/cpu/tegra-common/pinmux-common.c b/arch/arm/cpu/tegra-common/pinmux-common.c index 6d7a7d9..6e3ab0c 100644 --- a/arch/arm/cpu/tegra-common/pinmux-common.c +++ b/arch/arm/cpu/tegra-common/pinmux-common.c @@ -86,6 +86,22 @@ #define IO_RESET_SHIFT 8 #define RCV_SEL_SHIFT 9 +#if !defined(CONFIG_TEGRA20) && !defined(CONFIG_TEGRA30) +/* This register/field only exists on Tegra114 and later */ +#define APB_MISC_PP_PINMUX_GLOBAL_0 0x40 +#define CLAMP_INPUTS_WHEN_TRISTATED 1 + +void pinmux_set_tristate_input_clamping(void) +{ + u32 *reg = _R(APB_MISC_PP_PINMUX_GLOBAL_0); + u32 val; + + val = readl(reg); + val |= CLAMP_INPUTS_WHEN_TRISTATED; + writel(val, reg); +} +#endif + void pinmux_set_func(enum pmux_pingrp pin, enum pmux_func func) { u32 *reg = MUX_REG(pin); |