gpio.c

Go to the documentation of this file.

/* SPDX-License-Identifier: GPL-2.0-only */
#include <device/mmio.h>
#include <assert.h>
#include <gpio.h>
#include <types.h>
 
enum {
        MAX_GPIO_NUMBER = 134,
};
 
static void pos_bit_calc(gpio_t gpio, u32 *pos, u32 *bit)
{
        *pos = gpio.id / MAX_GPIO_REG_BITS;
        *bit = gpio.id % MAX_GPIO_REG_BITS;
}
 
void gpio_set_pull(gpio_t gpio, enum pull_enable enable,
                   enum pull_select select)
{
        u32 pos;
        u32 bit;
        u32 *en_reg, *sel_reg;
        u32 pin = gpio.id;
 
        pos_bit_calc(gpio, &pos, &bit);
 
        if (enable == GPIO_PULL_DISABLE) {
                en_reg = &mtk_gpio->pullen[pos].rst;
        } else {
        /* These pins' pulls can't be set through GPIO controller. */
                assert(pin < 22 || pin > 27);
                assert(pin < 47 || pin > 56);
                assert(pin < 57 || pin > 68);
                assert(pin < 73 || pin > 78);
                assert(pin < 100 || pin > 105);
                assert(pin < 119 || pin > 124);
 
                en_reg = &mtk_gpio->pullen[pos].set;
                sel_reg = (select == GPIO_PULL_DOWN) ?
                          (&mtk_gpio->pullsel[pos].rst) :
                          (&mtk_gpio->pullsel[pos].set);
                write16(sel_reg, 1L << bit);
        }
        write16(en_reg, 1L << bit);
}