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>
diff --git a/src/soc/intel/common/block/pmc/pmclib.c b/src/soc/intel/common/block/pmc/pmclib.c
index 564aacb..ee99735 100644
--- a/src/soc/intel/common/block/pmc/pmclib.c
+++ b/src/soc/intel/common/block/pmc/pmclib.c
@@ -579,3 +579,30 @@
/* 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);
+}