| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright 2014 Rockchip 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 <boot/coreboot_tables.h> |
| #include <console/console.h> |
| #include <gpio.h> |
| #include <string.h> |
| #include <vendorcode/google/chromeos/chromeos.h> |
| |
| #include "board.h" |
| |
| #define GPIO_WP GPIO(7, A, 6) |
| #define GPIO_POWER GPIO(0, A, 5) |
| #define GPIO_RECOVERY_SERVO GPIO(0, B, 1) |
| #define GPIO_RECOVERY_PUSHKEY GPIO(7, B, 1) |
| #define GPIO_DEVELOPER_SWITCH GPIO(7, B, 2) |
| |
| |
| void setup_chromeos_gpios(void) |
| { |
| gpio_input(GPIO_WP); |
| gpio_input(GPIO_POWER); |
| gpio_input_pullup(GPIO_RECOVERY_SERVO); |
| gpio_input_pullup(GPIO_RECOVERY_PUSHKEY); |
| gpio_input(GPIO_DEVELOPER_SWITCH); // board has pull up/down resistor. |
| } |
| |
| void fill_lb_gpios(struct lb_gpios *gpios) |
| { |
| int count = 0; |
| |
| /* Write Protect: active low */ |
| gpios->gpios[count].port = GPIO_WP.raw; |
| gpios->gpios[count].polarity = ACTIVE_LOW; |
| gpios->gpios[count].value = gpio_get(GPIO_WP); |
| strncpy((char *)gpios->gpios[count].name, "write protect", |
| GPIO_MAX_NAME_LENGTH); |
| count++; |
| |
| /* Recovery: active low */ |
| /* Note for early development, we want to support both servo and |
| * pushkey recovery buttons in firmware boot stages. |
| */ |
| gpios->gpios[count].port = GPIO_RECOVERY_PUSHKEY.raw; |
| gpios->gpios[count].polarity = ACTIVE_LOW; |
| gpios->gpios[count].value = !get_recovery_mode_switch(); |
| strncpy((char *)gpios->gpios[count].name, "recovery", |
| GPIO_MAX_NAME_LENGTH); |
| count++; |
| |
| /* Power Button: GPIO active low */ |
| gpios->gpios[count].port = GPIO_POWER.raw; |
| gpios->gpios[count].polarity = ACTIVE_LOW; |
| gpios->gpios[count].value = -1; |
| strncpy((char *)gpios->gpios[count].name, "power", |
| GPIO_MAX_NAME_LENGTH); |
| count++; |
| |
| /* Developer: GPIO active high */ |
| gpios->gpios[count].port = GPIO_DEVELOPER_SWITCH.raw; |
| gpios->gpios[count].polarity = ACTIVE_HIGH; |
| gpios->gpios[count].value = get_developer_mode_switch(); |
| strncpy((char *)gpios->gpios[count].name, "developer", |
| GPIO_MAX_NAME_LENGTH); |
| count++; |
| |
| /* Reset: GPIO active high (output) */ |
| gpios->gpios[count].port = GPIO_RESET.raw; |
| gpios->gpios[count].polarity = ACTIVE_HIGH; |
| gpios->gpios[count].value = -1; |
| strncpy((char *)gpios->gpios[count].name, "reset", |
| GPIO_MAX_NAME_LENGTH); |
| count++; |
| |
| gpios->size = sizeof(*gpios) + (count * sizeof(struct lb_gpio)); |
| gpios->count = count; |
| |
| printk(BIOS_ERR, "Added %d GPIOS size %d\n", count, gpios->size); |
| } |
| |
| int get_developer_mode_switch(void) |
| { |
| // GPIO_DEVELOPER_SWITCH is active high. |
| return gpio_get(GPIO_DEVELOPER_SWITCH); |
| } |
| |
| int get_recovery_mode_switch(void) |
| { |
| // Both RECOVERY_SERVO and RECOVERY_PUSHKEY are low active. |
| return !(gpio_get(GPIO_RECOVERY_SERVO) && |
| gpio_get(GPIO_RECOVERY_PUSHKEY)); |
| } |
| |
| int get_write_protect_state(void) |
| { |
| return !gpio_get(GPIO_WP); |
| } |