soc/intel/common: Implement power-failure-state handling

This is a consolidation of the respective feature in `soc/intel/*lake/`,
including additional support for MAINBOARD_POWER_STATE_PREVIOUS.

For the latter, firmware has to keep track of the `previous` state. The
feature was already advertised in Kconfig long ago, but not implemented.

SoC code has to call pmc_set_power_failure_state() at least once during
boot and needs to implement pmc_soc_set_afterg3_en() for the actual
register write.

Change-Id: Ic6970a79d9b95373c2855f4c92232d2aa05963bb
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34724
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
This commit is contained in:
Nico Huber 2019-08-05 19:19:59 +02:00
parent 84d5d65bce
commit ef19ce5346
2 changed files with 44 additions and 0 deletions

View File

@ -16,6 +16,7 @@
#ifndef SOC_INTEL_COMMON_BLOCK_PMCLIB_H
#define SOC_INTEL_COMMON_BLOCK_PMCLIB_H
#include <device/pci_type.h>
#include <stdint.h>
/* Forward declare the power state struct here */
@ -214,4 +215,20 @@ enum {
MAINBOARD_POWER_STATE_PREVIOUS,
};
/*
* Implemented by SoC code to set PMC register to know which state
* system should go into after power is reapplied.
*/
void pmc_soc_set_afterg3_en(bool on);
/*
* Configure power state to go into when power is reapplied.
*
* To be called by SoC code once during boot and will be called by
* the "sleep" SMI handler when going into S5.
*
* `target_on` signifies that we are currently powering on, so that
* MAINBOARD_POWER_STATE_PREVIOUS can be handled accordingly.
*/
void pmc_set_power_failure_state(bool target_on);
#endif /* SOC_INTEL_COMMON_BLOCK_PMCLIB_H */

View File

@ -579,3 +579,30 @@ void pmc_gpe_init(void)
/* Set the routes in the GPIO communities as well. */
gpio_route_gpe(dw0, dw1, dw2);
}
void pmc_set_power_failure_state(const bool target_on)
{
const int state = CONFIG_MAINBOARD_POWER_FAILURE_STATE;
bool on;
switch (state) {
case MAINBOARD_POWER_STATE_OFF:
printk(BIOS_INFO, "Set power off after power failure.\n");
on = false;
break;
case MAINBOARD_POWER_STATE_ON:
printk(BIOS_INFO, "Set power on after power failure.\n");
on = true;
break;
case MAINBOARD_POWER_STATE_PREVIOUS:
printk(BIOS_INFO, "Keep power state after power failure.\n");
on = target_on;
break;
default:
printk(BIOS_WARNING, "WARNING: Unknown power-failure state: %d\n", state);
on = false;
break;
}
pmc_soc_set_afterg3_en(on);
}