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gaia: Add a warm reboot function

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Added a warm reboot function that reboots the AP while preserving
RAM contents. This will be helpful in debugging AP/OS hard hangs since
in conjunction with PSTORE_CONSOLE in the kernel, the kernel log messages
from the previous boot will be preserved.

BUG=chrome-os-partner:13249
TEST=1. From EC console issue the "warm_reboot" command. Upon rebooting
"cat /dev/pstore/console-ramoops" and ensure that the contents are dmesg
of previous boot.
2. Reboot the system using alt-volume_up-r key combination. Upon
rebooting, check pstore contents in the same manner as case#1 above.
BRANCH=snow

Change-Id: Ic8f0415da6182f4c1bc2d35b91302ceda5c19569
Signed-off-by: Sameer Nanda <snanda@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/31523
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
This commit is contained in:
Sameer Nanda
2012-08-24 17:38:26 -07:00
committed by Gerrit
parent bb3bb92628
commit 73e439dc87
3 changed files with 55 additions and 0 deletions
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25
chip/stm32/keyboard_scan.c
View File

@@ -64,6 +64,16 @@ static const uint8_t actual_key_masks[4][KB_OUTPUTS] = {
#define MASK_INDEX_REFRESH 2
#define MASK_VALUE_REFRESH 0x04
/* Key masks and values for warm reboot combination */
#define MASK_INDEX_KEYR 3
#define MASK_VALUE_KEYR 0x80
#define MASK_INDEX_VOL_UP 4
#define MASK_VALUE_VOL_UP 0x01
#define MASK_INDEX_RIGHT_ALT 10
#define MASK_VALUE_RIGHT_ALT 0x01
#define MASK_INDEX_LEFT_ALT 10
#define MASK_VALUE_LEFT_ALT 0x40
struct kbc_gpio {
int num; /* logical row or column number */
uint32_t port;
@@ -217,6 +227,16 @@ void enter_polling_mode(void)
select_column(COL_TRI_STATE_ALL);
}
static int check_warm_reboot_keys(void)
{
if (raw_state[MASK_INDEX_KEYR] == MASK_VALUE_KEYR &&
raw_state[MASK_INDEX_VOL_UP] == MASK_VALUE_VOL_UP &&
(raw_state[MASK_INDEX_RIGHT_ALT] == MASK_VALUE_RIGHT_ALT ||
raw_state[MASK_INDEX_LEFT_ALT] == MASK_VALUE_LEFT_ALT))
return 1;
return 0;
}
/* Returns 1 if any key is still pressed. 0 if no key is pressed. */
static int check_keys_changed(void)
@@ -295,6 +315,11 @@ static int check_keys_changed(void)
}
CPUTS("]\n");
if (num_press == 3) {
if (check_warm_reboot_keys())
system_warm_reboot();
}
if (kb_fifo_add(raw_state) == EC_SUCCESS)
board_interrupt_host(1);
else

27
common/gaia_power.c
View File

@@ -588,3 +588,30 @@ DECLARE_CONSOLE_COMMAND(power, command_power,
"on/off",
"Turn AP power on/off",
NULL);
void system_warm_reboot(void)
{
CPRINTF("[%T EC triggered warm reboot ]\n");
/* This is a hack to do an AP warm reboot while still preserving
* RAM contents. This is useful for looking at kernel log message
* contents from previous boot in cases where the AP/OS is hard
* hung. */
gpio_set_level(GPIO_EN_PP5000, 0);
gpio_set_level(GPIO_EN_PP3300, 0);
power_request = POWER_REQ_ON;
task_wake(TASK_ID_GAIAPOWER);
return;
}
static int command_warm_reboot(int argc, char **argv)
{
system_warm_reboot();
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(warm_reboot, command_warm_reboot,
NULL,
"EC triggered warm reboot",
NULL);

3
include/system.h
View File

@@ -156,6 +156,9 @@ const char *system_get_build_info(void);
void system_reset(int flags);
/* System warm reboot while keeping the RAM alive. */
void system_warm_reboot(void);
/* Set a scratchpad register to the specified value. The scratchpad
* register must maintain its contents across a software-requested
* warm reset. */