pm_state.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <acpi/acpi_gnvs.h>
#include <acpi/acpi_pm.h>
#include <amdblocks/acpi.h>
#include <bootstate.h>
#include <soc/acpi.h>
#include <soc/nvs.h>
#include <soc/southbridge.h>
#include <types.h>
 
static int get_index_bit(uint32_t value, uint16_t limit)
{
        uint16_t i;
        uint32_t t;
 
        if (limit > TOTAL_BITS(uint32_t))
                return -1;
 
        /* get a mask of valid bits. Ex limit = 3, set bits 0-2 */
        t = (1ULL << limit) - 1;
        if ((value & t) == 0)
                return -1;
        t = 1;
        for (i = 0; i < limit; i++) {
                if (value & t)
                        break;
                t <<= 1;
        }
        return i;
}
 
static void pm_fill_gnvs(struct global_nvs *gnvs, const struct acpi_pm_gpe_state *state)
{
        int index;
 
        index = get_index_bit(state->pm1_sts & state->pm1_en, PM1_LIMIT);
        if (index >= 0)
                gnvs->pm1i = index;
 
        index = get_index_bit(state->gpe0_sts & state->gpe0_en, GPE0_LIMIT);
        if (index >= 0)
                gnvs->gpei = index;
}
 
static void acpi_save_wake_source(void *unused)
{
        const struct chipset_power_state *ps;
        struct global_nvs *gnvs;
 
        if (acpi_reset_gnvs_for_wake(&gnvs) < 0)
                return;
        if (acpi_pm_state_for_wake(&ps) < 0)
                return;
 
        pm_fill_gnvs(gnvs, &ps->gpe_state);
}
 
BOOT_STATE_INIT_ENTRY(BS_PRE_DEVICE, BS_ON_ENTRY, acpi_save_wake_source, NULL);