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drivers: tegra_gpio: add early SPL functions

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In some cases access to GPIOs is needed so early that DM
is not ready even nearly. These functions are exactly for
this case.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
This commit is contained in:
Svyatoslav Ryhel 2024-08-09 21:10:31 +03:00
parent d7c98f2030
commit 2ff444d07d
2 changed files with 69 additions and 0 deletions
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50
drivers/gpio/tegra_gpio.c
View file

@ -257,6 +257,56 @@ static const struct dm_gpio_ops gpio_tegra_ops = {
.xlate = tegra_gpio_xlate,
};
/*
* SPL GPIO functions.
*/
int spl_gpio_output(void *regs, uint gpio, int value)
{
/* Configure GPIO output value. */
set_level(gpio, value);
/* Configure GPIO direction as output. */
set_direction(gpio, DIRECTION_OUTPUT);
/* Enable the pin as a GPIO */
set_config(gpio, 1);
return 0;
}
int spl_gpio_input(void *regs, uint gpio)
{
/* Configure GPIO direction as input. */
set_direction(gpio, DIRECTION_INPUT);
/* Enable the pin as a GPIO */
set_config(gpio, 1);
return 0;
}
int spl_gpio_get_value(void *regs, uint gpio)
{
struct gpio_ctlr *ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
struct gpio_ctlr_bank *bank = &ctlr->gpio_bank[GPIO_BANK(gpio)];
int val;
if (get_direction(gpio) == DIRECTION_INPUT)
val = readl(&bank->gpio_in[GPIO_PORT(gpio)]);
else
val = readl(&bank->gpio_out[GPIO_PORT(gpio)]);
return (val >> GPIO_BIT(gpio)) & 1;
}
int spl_gpio_set_value(void *regs, uint gpio, int value)
{
/* Configure GPIO output value. */
set_level(gpio, value);
return 0;
}
/**
* Returns the name of a GPIO port
*

19
include/spl_gpio.h
View file

@ -59,4 +59,23 @@ int spl_gpio_output(void *regs, uint gpio, int value);
*/
int spl_gpio_input(void *regs, uint gpio);
/**
* spl_gpio_get_value() - Get GPIO value
*
* @regs: Pointer to GPIO registers
* @gpio: GPIO to adjust (SoC-specific)
* Return: return GPIO value if OK, -ve on error
*/
int spl_gpio_get_value(void *regs, uint gpio);
/**
* spl_gpio_set_value() - Set value on GPIO
*
* @regs: Pointer to GPIO registers
* @gpio: GPIO to adjust (SoC-specific)
* @value: 0 to set the output low, 1 to set it high
* Return: return 0 if OK, -ve on error
*/
int spl_gpio_set_value(void *regs, uint gpio, int value);
#endif /* __SPL_GPIO_H */