blob: c701034a52ece29c5f5255be9ec7597bc89e4339 [file] [log] [blame]
/*
* This file is part of the coreboot project.
*
* Copyright 2015 MediaTek Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#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);
}