diff options
Diffstat (limited to 'src/soc/mediatek/mt8183/gpio.c')
-rw-r--r-- | src/soc/mediatek/mt8183/gpio.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/src/soc/mediatek/mt8183/gpio.c b/src/soc/mediatek/mt8183/gpio.c new file mode 100644 index 0000000000..d555c3356b --- /dev/null +++ b/src/soc/mediatek/mt8183/gpio.c @@ -0,0 +1,69 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2018 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 <arch/io.h> +#include <gpio.h> + +enum { + EN_OFFSET = 0x60, + SEL_OFFSET = 0x80, +}; + +static void gpio_set_pull_pupd(gpio_t gpio, enum pull_enable enable, + enum pull_select select) +{ + void *reg = GPIO_TO_IOCFG_BASE(gpio.base) + gpio.offset; + int bit = gpio.bit; + + if (enable == GPIO_PULL_ENABLE) { + if (select == GPIO_PULL_DOWN) + setbits_le32(reg, 1 << (bit + 2)); + else + clrbits_le32(reg, 1 << (bit + 2)); + } + + if (enable == GPIO_PULL_ENABLE) + clrsetbits_le32(reg, 3 << bit, 1 << bit); + else + clrbits_le32(reg, 3 << bit); +} + +static void gpio_set_pull_en_sel(gpio_t gpio, enum pull_enable enable, + enum pull_select select) +{ + void *reg = GPIO_TO_IOCFG_BASE(gpio.base) + gpio.offset; + int bit = gpio.bit; + + if (enable == GPIO_PULL_ENABLE) { + if (select == GPIO_PULL_DOWN) + clrbits_le32(reg + SEL_OFFSET, 1 << bit); + else + setbits_le32(reg + SEL_OFFSET, 1 << bit); + } + + if (enable == GPIO_PULL_ENABLE) + setbits_le32(reg + EN_OFFSET, 1 << bit); + else + clrbits_le32(reg + EN_OFFSET, 1 << bit); +} + +void gpio_set_pull(gpio_t gpio, enum pull_enable enable, + enum pull_select select) +{ + if (gpio.flag) + gpio_set_pull_pupd(gpio, enable, select); + else + gpio_set_pull_en_sel(gpio, enable, select); +} |