diff options
Diffstat (limited to 'src/soc/mediatek/mt8173/gpio.c')
| -rw-r--r-- | src/soc/mediatek/mt8173/gpio.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/src/soc/mediatek/mt8173/gpio.c b/src/soc/mediatek/mt8173/gpio.c new file mode 100644 index 0000000000..1f0e5710f3 --- /dev/null +++ b/src/soc/mediatek/mt8173/gpio.c @@ -0,0 +1,181 @@ +/* + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include <arch/io.h> +#include <assert.h> +#include <console/console.h> +#include <gpio.h> +#include <types.h> +#include <soc/addressmap.h> +#include <soc/gpio.h> + +enum { + MAX_8173_GPIO = 134, + MAX_GPIO_REG_BITS = 16, + MAX_GPIO_MODE_PER_REG = 5, + GPIO_MODE_BITS = 3, +}; + +enum { + GPIO_DIRECTION_IN = 0, + GPIO_DIRECTION_OUT = 1, +}; + +enum { + GPIO_MODE = 0, +}; + +static void pos_bit_calc(u32 pin, u32 *pos, u32 *bit) +{ + *pos = pin / MAX_GPIO_REG_BITS; + *bit = pin % MAX_GPIO_REG_BITS; +} + +static void pos_bit_calc_for_mode(u32 pin, u32 *pos, u32 *bit) +{ + *pos = pin / MAX_GPIO_MODE_PER_REG; + *bit = (pin % MAX_GPIO_MODE_PER_REG) * GPIO_MODE_BITS; +} + +static s32 gpio_set_dir(u32 pin, u32 dir) +{ + u32 pos; + u32 bit; + u16 *reg; + + assert(pin <= MAX_8173_GPIO); + + pos_bit_calc(pin, &pos, &bit); + + if (dir == GPIO_DIRECTION_IN) + reg = &mt8173_gpio->dir[pos].rst; + else + reg = &mt8173_gpio->dir[pos].set; + + write16(reg, 1L << bit); + + return 0; +} + +void gpio_set_pull(gpio_t pin, enum pull_enable enable, + enum pull_select select) +{ + u32 pos; + u32 bit; + u16 *en_reg, *sel_reg; + + assert(pin <= MAX_8173_GPIO); + + pos_bit_calc(pin, &pos, &bit); + + if (enable == GPIO_PULL_DISABLE) { + en_reg = &mt8173_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 = &mt8173_gpio->pullen[pos].set; + sel_reg = (select == GPIO_PULL_DOWN) ? + (&mt8173_gpio->pullsel[pos].rst) : + (&mt8173_gpio->pullsel[pos].set); + write16(sel_reg, 1L << bit); + } + write16(en_reg, 1L << bit); +} + +int gpio_get(gpio_t pin) +{ + u32 pos; + u32 bit; + u16 *reg; + s32 data; + + assert(pin <= MAX_8173_GPIO); + + pos_bit_calc(pin, &pos, &bit); + + reg = &mt8173_gpio->din[pos].val; + data = read32(reg); + + return (data & (1L << bit)) ? 1 : 0; +} + +void gpio_set(gpio_t pin, int output) +{ + u32 pos; + u32 bit; + u16 *reg; + + assert(pin <= MAX_8173_GPIO); + + pos_bit_calc(pin, &pos, &bit); + + if (output == 0) + reg = &mt8173_gpio->dout[pos].rst; + else + reg = &mt8173_gpio->dout[pos].set; + write16(reg, 1L << bit); +} + +void gpio_set_mode(gpio_t pin, int mode) +{ + u32 pos; + u32 bit; + u32 mask = (1L << GPIO_MODE_BITS) - 1; + + assert(pin <= MAX_8173_GPIO); + + pos_bit_calc_for_mode(pin, &pos, &bit); + + clrsetbits_le32(&mt8173_gpio->mode[pos].val, + mask << bit, mode << bit); +} + +void gpio_input_pulldown(gpio_t gpio) +{ + gpio_set_pull(gpio, GPIO_PULL_ENABLE, GPIO_PULL_DOWN); + gpio_set_dir(gpio, GPIO_DIRECTION_IN); + gpio_set_mode(gpio, GPIO_MODE); +} + +void gpio_input_pullup(gpio_t gpio) +{ + gpio_set_pull(gpio, GPIO_PULL_ENABLE, GPIO_PULL_UP); + gpio_set_dir(gpio, GPIO_DIRECTION_IN); + gpio_set_mode(gpio, GPIO_MODE); +} + +void gpio_input(gpio_t gpio) +{ + gpio_set_pull(gpio, GPIO_PULL_DISABLE, GPIO_PULL_DOWN); + gpio_set_dir(gpio, GPIO_DIRECTION_IN); + gpio_set_mode(gpio, GPIO_MODE); +} + +void gpio_output(gpio_t gpio, int value) +{ + gpio_set_pull(gpio, GPIO_PULL_DISABLE, GPIO_PULL_DOWN); + gpio_set(gpio, value); + gpio_set_dir(gpio, GPIO_DIRECTION_OUT); + gpio_set_mode(gpio, GPIO_MODE); +} |