diff options
Diffstat (limited to 'src/mainboard/google/gale/chromeos.c')
| -rw-r--r-- | src/mainboard/google/gale/chromeos.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/src/mainboard/google/gale/chromeos.c b/src/mainboard/google/gale/chromeos.c new file mode 100644 index 0000000000..a379280ca5 --- /dev/null +++ b/src/mainboard/google/gale/chromeos.c @@ -0,0 +1,154 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2014 Google 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 <boardid.h> +#include <boot/coreboot_tables.h> +#include <console/console.h> +#include <delay.h> +#include <drivers/i2c/ww_ring/ww_ring.h> +#include <gpio.h> +#include <soc/cdp.h> +#include <soc/gsbi.h> +#include <string.h> +#include <timer.h> +#include <vendorcode/google/chromeos/chromeos.h> + +#define DEV_SW 15 +#define DEV_POL ACTIVE_LOW +#define REC_SW 16 +#define REC_POL ACTIVE_LOW +#define WP_SW 17 +#define WP_POL ACTIVE_LOW + +static int read_gpio(gpio_t gpio_num) +{ + gpio_tlmm_config_set(gpio_num, GPIO_FUNC_DISABLE, + GPIO_NO_PULL, GPIO_2MA, GPIO_DISABLE); + udelay(10); /* Should be enough to settle. */ + return gpio_get(gpio_num); +} + +void fill_lb_gpios(struct lb_gpios *gpios) +{ + struct lb_gpio chromeos_gpios[] = { + {DEV_SW, ACTIVE_LOW, read_gpio(DEV_SW), "developer"}, + {REC_SW, ACTIVE_LOW, read_gpio(REC_SW), "recovery"}, + {WP_SW, ACTIVE_LOW, read_gpio(WP_SW), "write protect"}, + {-1, ACTIVE_LOW, 1, "power"}, + {-1, ACTIVE_LOW, 0, "lid"}, + }; + lb_add_gpios(gpios, chromeos_gpios, ARRAY_SIZE(chromeos_gpios)); +} + +int get_developer_mode_switch(void) +{ + return 0; +} + +/* + * The recovery switch on storm is overloaded: it needs to be pressed for a + * certain duration at startup to signal different requests: + * + * - keeping it pressed for 8 to 16 seconds after startup signals the need for + * factory reset (wipeout); + * - keeping it pressed for longer than 16 seconds signals the need for Chrome + * OS recovery. + * + * The state is read once and cached for following inquiries. The below enum + * lists possible states. + */ +enum switch_state { + not_probed = -1, + no_req, + recovery_req, + wipeout_req +}; + +static void display_pattern(int pattern) +{ + if (board_id() == BOARD_ID_WHIRLWIND_SP5) + ww_ring_display_pattern(GSBI_ID_7, pattern); +} + +#define WIPEOUT_MODE_DELAY_MS (8 * 1000) +#define RECOVERY_MODE_EXTRA_DELAY_MS (8 * 1000) + +static enum switch_state get_switch_state(void) +{ + struct stopwatch sw; + int sampled_value; + static enum switch_state saved_state = not_probed; + + if (saved_state != not_probed) + return saved_state; + + sampled_value = read_gpio(REC_SW) ^ !REC_POL; + + if (!sampled_value) { + saved_state = no_req; + display_pattern(WWR_NORMAL_BOOT); + return saved_state; + } + + display_pattern(WWR_RECOVERY_PUSHED); + printk(BIOS_INFO, "recovery button pressed\n"); + + stopwatch_init_msecs_expire(&sw, WIPEOUT_MODE_DELAY_MS); + + do { + sampled_value = read_gpio(REC_SW) ^ !REC_POL; + if (!sampled_value) + break; + } while (!stopwatch_expired(&sw)); + + if (sampled_value) { + display_pattern(WWR_WIPEOUT_REQUEST); + printk(BIOS_INFO, "wipeout requested, checking recovery\n"); + stopwatch_init_msecs_expire(&sw, RECOVERY_MODE_EXTRA_DELAY_MS); + do { + sampled_value = read_gpio(REC_SW) ^ !REC_POL; + if (!sampled_value) + break; + } while (!stopwatch_expired(&sw)); + + if (sampled_value) { + saved_state = recovery_req; + display_pattern(WWR_RECOVERY_REQUEST); + printk(BIOS_INFO, "recovery requested\n"); + } else { + saved_state = wipeout_req; + } + } else { + saved_state = no_req; + display_pattern(WWR_NORMAL_BOOT); + } + + return saved_state; +} + +int get_recovery_mode_switch(void) +{ + return get_switch_state() == recovery_req; +} + +int get_wipeout_mode_switch(void) +{ + return get_switch_state() == wipeout_req; +} + +int get_write_protect_state(void) +{ + return read_gpio(WP_SW) ^ !WP_POL; +} |