src/mainboard/google/veyron_rialto/chromeos.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright 2014 Rockchip Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <boot/coreboot_tables.h>
  17 #include <console/console.h>
  18 #include <gpio.h>
  19 #include <string.h>
  20 #include <vendorcode/google/chromeos/chromeos.h>
  21
  22 #include "board.h"
  23
  24 #define GPIO_WP         GPIO(7, A, 6)
  25 #define GPIO_POWER      GPIO(0, A, 5)
  26 #define GPIO_RECOVERY_SERVO     GPIO(0, B, 1)
  27 #define GPIO_RECOVERY_PUSHKEY   GPIO(7, B, 1)
  28 #define GPIO_DEVELOPER_SWITCH   GPIO(7, B, 2)
  29
  30
  31 void setup_chromeos_gpios(void)
  32 {
  33         gpio_input(GPIO_WP);
  34         gpio_input(GPIO_POWER);
  35         gpio_input_pullup(GPIO_RECOVERY_SERVO);
  36         gpio_input_pullup(GPIO_RECOVERY_PUSHKEY);
  37         gpio_input(GPIO_DEVELOPER_SWITCH);  // board has pull up/down resistor.
  38 }
  39
  40 void fill_lb_gpios(struct lb_gpios *gpios)
  41 {
  42         int count = 0;
  43
  44         /* Write Protect: active low */
  45         gpios->gpios[count].port = GPIO_WP.raw;
  46         gpios->gpios[count].polarity = ACTIVE_LOW;
  47         gpios->gpios[count].value = gpio_get(GPIO_WP);
  48         strncpy((char *)gpios->gpios[count].name, "write protect",
  49                 GPIO_MAX_NAME_LENGTH);
  50         count++;
  51
  52         /* Recovery: active low */
  53         /* Note for early development, we want to support both servo and
  54          * pushkey recovery buttons in firmware boot stages.
  55          */
  56         gpios->gpios[count].port = GPIO_RECOVERY_PUSHKEY.raw;
  57         gpios->gpios[count].polarity = ACTIVE_LOW;
  58         gpios->gpios[count].value = !get_recovery_mode_switch();
  59         strncpy((char *)gpios->gpios[count].name, "recovery",
  60                 GPIO_MAX_NAME_LENGTH);
  61         count++;
  62
  63         /* Power Button: GPIO active low */
  64         gpios->gpios[count].port = GPIO_POWER.raw;
  65         gpios->gpios[count].polarity = ACTIVE_LOW;
  66         gpios->gpios[count].value = -1;
  67         strncpy((char *)gpios->gpios[count].name, "power",
  68                 GPIO_MAX_NAME_LENGTH);
  69         count++;
  70
  71         /* Developer: GPIO active high */
  72         gpios->gpios[count].port = GPIO_DEVELOPER_SWITCH.raw;
  73         gpios->gpios[count].polarity = ACTIVE_HIGH;
  74         gpios->gpios[count].value = get_developer_mode_switch();
  75         strncpy((char *)gpios->gpios[count].name, "developer",
  76                 GPIO_MAX_NAME_LENGTH);
  77         count++;
  78
  79         /* Reset: GPIO active high (output) */
  80         gpios->gpios[count].port = GPIO_RESET.raw;
  81         gpios->gpios[count].polarity = ACTIVE_HIGH;
  82         gpios->gpios[count].value = -1;
  83         strncpy((char *)gpios->gpios[count].name, "reset",
  84                 GPIO_MAX_NAME_LENGTH);
  85         count++;
  86
  87         gpios->size = sizeof(*gpios) + (count * sizeof(struct lb_gpio));
  88         gpios->count = count;
  89
  90         printk(BIOS_ERR, "Added %d GPIOS size %d\n", count, gpios->size);
  91 }
  92
  93 int get_developer_mode_switch(void)
  94 {
  95         // GPIO_DEVELOPER_SWITCH is active high.
  96         return gpio_get(GPIO_DEVELOPER_SWITCH);
  97 }
  98
  99 int get_recovery_mode_switch(void)
 100 {
 101         // Both RECOVERY_SERVO and RECOVERY_PUSHKEY are low active.
 102         return !(gpio_get(GPIO_RECOVERY_SERVO) &&
 103                  gpio_get(GPIO_RECOVERY_PUSHKEY));
 104 }
 105
 106 int get_write_protect_state(void)
 107 {
 108         return !gpio_get(GPIO_WP);
 109 }