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authorStephen Warren <swarren@nvidia.com>2014-04-22 14:37:53 -0600
committerTom Warren <twarren@nvidia.com>2014-05-13 10:41:31 -0700
commiteceb3f26f407d65dae3902180b3c9f3128f0f349 (patch)
treefa5130637f363cf3735b40355edf0bbe6defa32d /arch
parent4a68d3431ace189746ffb498dc9e844296626615 (diff)
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ARM: tegra: add GPIO initialization table function
The HW-defined procedure for booting Tegra requires that some pins be set up as GPIOs immediately at boot in order to avoid glitches on those pins, when the pinmux is programmed. Add a feature to the GPIO driver which executes a GPIO configuration table. Board files will use this to implement the correct HW initialization procedure. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/include/asm/arch-tegra/gpio.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-tegra/gpio.h b/arch/arm/include/asm/arch-tegra/gpio.h
index d97190d..44cd455 100644
--- a/arch/arm/include/asm/arch-tegra/gpio.h
+++ b/arch/arm/include/asm/arch-tegra/gpio.h
@@ -14,11 +14,31 @@
#define GPIO_FULLPORT(x) ((x) >> 3)
#define GPIO_BIT(x) ((x) & 0x7)
+enum tegra_gpio_init {
+ TEGRA_GPIO_INIT_IN,
+ TEGRA_GPIO_INIT_OUT0,
+ TEGRA_GPIO_INIT_OUT1,
+};
+
+struct tegra_gpio_config {
+ u32 gpio:16;
+ u32 init:2;
+};
+
/*
* Tegra-specific GPIO API
*/
+/**
+ * Configure a list of GPIOs
+ *
+ * @param config List of GPIO configurations
+ * @param len Number of config items in list
+ */
+void gpio_config_table(const struct tegra_gpio_config *config, int len);
+
void gpio_info(void);
#define gpio_status() gpio_info()
+
#endif /* TEGRA_GPIO_H_ */