| /* |
| * 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 <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); |
| } |