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Merge "stm32l: add a simple shutdown sequence for GAIA SoC."

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Gerrit
2012-02-22 08:17:13 -08:00
committed by Gerrit Code Review
parent 12b12e5334 bd331737b4
commit 028df3ba51
1 changed files with 50 additions and 5 deletions
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55
common/gaia_power.c
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@@ -19,8 +19,15 @@
/* Delay between 1.35v and 3.3v rails startup */
#define DELAY_RAIL_STAGGERING 100 /* 100us */
/* Long power key press to force shutdown */
#define DELAY_FORCE_SHUTDOWN 8000000 /* 8s */
/* PMIC fails to set the LDO2 output */
#define PMIC_TIMEOUT 200000 /* 200ms */
/* Default timeout for input transition */
#define FAIL_TIMEOUT 1000000 /* 5s */
#define FAIL_TIMEOUT 5000000 /* 5s */
/* Application processor power state */
static int ap_on;
@@ -56,6 +63,37 @@ static int wait_in_signal(enum gpio_signal signal, int value, int timeout)
return EC_SUCCESS;
}
/* Wait for some event triggering the shutdown.
*
* It can be either a long power button press or a shutdown triggered from the
* AP and detected by reading XPSHOLD.
*/
static void wait_for_power_off(void)
{
timestamp_t deadline, now;
while (1) {
/* wait for power button press or XPSHOLD falling edge */
while ((gpio_get_level(GPIO_EC_PWRON) == 0) &&
(gpio_get_level(GPIO_SOC1V8_XPSHOLD) == 1)) {
task_wait_msg(-1);
}
/* XPSHOLD released by AP : shutdown immediatly */
if (gpio_get_level(GPIO_SOC1V8_XPSHOLD) == 0)
return;
/* check if power button is pressed for 8s */
deadline.val = get_time().val + DELAY_FORCE_SHUTDOWN;
while ((gpio_get_level(GPIO_EC_PWRON) == 1) &&
(gpio_get_level(GPIO_SOC1V8_XPSHOLD) == 1)) {
now = get_time();
if ((now.val >= deadline.val) ||
(task_wait_msg(deadline.val - now.val) ==
(1 << TASK_ID_TIMER)))
return;
}
}
}
void gaia_power_event(enum gpio_signal signal)
{
@@ -97,7 +135,7 @@ void gaia_power_task(void)
/* Startup PMIC */
gpio_set_level(GPIO_PMIC_ACOK, 1);
/* wait for all PMIC regulators to be ready */
wait_in_signal(GPIO_PP1800_LDO2, 1, FAIL_TIMEOUT);
wait_in_signal(GPIO_PP1800_LDO2, 1, PMIC_TIMEOUT);
/* Enable DDR 1.35v power rail */
gpio_set_level(GPIO_EN_PP1350, 1);
@@ -117,9 +155,16 @@ void gaia_power_task(void)
ap_on = 1;
uart_printf("AP running ...\n");
/* wait forever : TODO implement power OFF */
while (1)
task_wait_msg(-1);
/* Wait for power off from AP or long power button press */
wait_for_power_off();
/* switch off all rails */
gpio_set_level(GPIO_EN_PP3300, 0);
gpio_set_level(GPIO_EN_PP1350, 0);
gpio_set_level(GPIO_EN_PP5000, 0);
uart_printf("Shutdown complete.\n");
/* Ensure the power button is released */
wait_in_signal(GPIO_EC_PWRON, 0, -1);
}
}