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>
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@ -16,6 +16,7 @@
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#ifndef SOC_INTEL_COMMON_BLOCK_PMCLIB_H
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#define SOC_INTEL_COMMON_BLOCK_PMCLIB_H
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#include <device/pci_type.h>
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#include <stdint.h>
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/* Forward declare the power state struct here */
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@ -214,4 +215,20 @@ enum {
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MAINBOARD_POWER_STATE_PREVIOUS,
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};
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/*
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* Implemented by SoC code to set PMC register to know which state
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* system should go into after power is reapplied.
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*/
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void pmc_soc_set_afterg3_en(bool on);
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/*
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* Configure power state to go into when power is reapplied.
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*
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* To be called by SoC code once during boot and will be called by
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* the "sleep" SMI handler when going into S5.
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*
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* `target_on` signifies that we are currently powering on, so that
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* MAINBOARD_POWER_STATE_PREVIOUS can be handled accordingly.
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*/
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void pmc_set_power_failure_state(bool target_on);
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#endif /* SOC_INTEL_COMMON_BLOCK_PMCLIB_H */
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@ -579,3 +579,30 @@ void pmc_gpe_init(void)
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/* Set the routes in the GPIO communities as well. */
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gpio_route_gpe(dw0, dw1, dw2);
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}
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void pmc_set_power_failure_state(const bool target_on)
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{
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const int state = CONFIG_MAINBOARD_POWER_FAILURE_STATE;
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bool on;
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switch (state) {
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case MAINBOARD_POWER_STATE_OFF:
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printk(BIOS_INFO, "Set power off after power failure.\n");
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on = false;
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break;
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case MAINBOARD_POWER_STATE_ON:
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printk(BIOS_INFO, "Set power on after power failure.\n");
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on = true;
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break;
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case MAINBOARD_POWER_STATE_PREVIOUS:
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printk(BIOS_INFO, "Keep power state after power failure.\n");
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on = target_on;
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break;
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default:
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printk(BIOS_WARNING, "WARNING: Unknown power-failure state: %d\n", state);
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on = false;
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break;
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}
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pmc_soc_set_afterg3_en(on);
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}
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