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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>
This commit is contained in:
Stephen Warren 2014-04-22 14:37:53 -06:00 committed by Tom Warren
parent 4a68d3431a
commit eceb3f26f4
2 changed files with 40 additions and 0 deletions
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20
arch/arm/include/asm/arch-tegra/gpio.h
View File

@ -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_ */

20
drivers/gpio/tegra_gpio.c
View File

@ -221,6 +221,26 @@ int gpio_set_value(unsigned gpio, int value)
return 0;
}
void gpio_config_table(const struct tegra_gpio_config *config, int len)
{
int i;
for (i = 0; i < len; i++) {
switch (config[i].init) {
case TEGRA_GPIO_INIT_IN:
gpio_direction_input(config[i].gpio);
break;
case TEGRA_GPIO_INIT_OUT0:
gpio_direction_output(config[i].gpio, 0);
break;
case TEGRA_GPIO_INIT_OUT1:
gpio_direction_output(config[i].gpio, 1);
break;
}
set_config(config[i].gpio, 1);
}
}
/*
* Display Tegra GPIO information
*/