gpio_init.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <device/mmio.h>
#include <soc/gpio.h>
#include <soc/mipi.h>
 
/*
 * GPIO 47-56 are controlled by MIPI register by default.
 * When they are used as GPI, we have to set IES of MIPI register to 1.
 * Additionally, pulls of these pins are controlled by MIPI,
 * and pull-setting of these pins are forbidden in our driver.
 */
static void set_gpi_from_mipi(void)
{
        setbits32(&mt8173_mipi->mipi_rx_ana4c,
                1 << 0  |       /* RG_MIPI_GPI0_IES GPI47 */
                1 << 6  |       /* RG_MIPI_GPI1_IES GPI48 */
                1 << 12 |       /* RG_MIPI_GPI2_IES GPI49 */
                1 << 18 |       /* RG_MIPI_GPI3_IES GPI50 */
                1 << 24);       /* RF_MIPI_GPI4_IES GPI51 */
 
        setbits32(&mt8173_mipi->mipi_rx_ana50,
                1 << 0  |       /* RG_MIPI_GPI5_IES GPI52 */
                1 << 6  |       /* RG_MIPI_GPI6_IES GPI53 */
                1 << 12 |       /* RG_MIPI_GPI7_IES GPI54 */
                1 << 18 |       /* RG_MIPI_GPI8_IES GPI55 */
                1 << 24);       /* RF_MIPI_GPI9_IES GPI56 */
}
 
/*
 * overwrite the T/RDSEL default value of exmd_ctrl and
 * msdc2_ctrl5 as b'1010
 */
static void gpio_set_duty(enum external_power ext_power)
{
        /* EXMD control reg */
        if (ext_power == GPIO_EINT_1P8V) {
                /* exmd_ctrl[9:4] = b`000000, [3:0] = b`1010 */
                write16(&mtk_gpio->exmd_ctrl[0].rst, 0x3F5);
                write16(&mtk_gpio->exmd_ctrl[0].set, 0xA);
        } else if (ext_power == GPIO_EINT_3P3V) {
                /* exmd_ctrl[9:4] = b`001100, [3:0] = b`1010 */
                write16(&mtk_gpio->exmd_ctrl[0].rst, 0x335);
                write16(&mtk_gpio->exmd_ctrl[0].set, 0xCA);
        }
 
        /* other R/TDSEL */
        /* msdc2_ctrl5, bit[3:0] = b`1010 */
        write16(&mtk_gpio->msdc2_ctrl5.set, 0xA);
        write16(&mtk_gpio->msdc2_ctrl5.rst, 0x5);
}
 
void gpio_init(enum external_power ext_power)
{
        set_gpi_from_mipi();
        gpio_set_duty(ext_power);
}