acpi_wake_source.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <acpi/acpi_gnvs.h>
#include <acpi/acpi_pm.h>
#include <bootstate.h>
#include <console/console.h>
#include <intelblocks/acpi_wake_source.h>
#include <soc/nvs.h>
#include <soc/pm.h>
#include <stdint.h>
 
/* Save wake source data for ACPI _SWS methods in NVS */
static void pm_fill_gnvs(struct global_nvs *gnvs, const struct chipset_power_state *ps)
{
        uint32_t pm1, *gpe0;
        int index, gpe_reg, gpe_reg_count;
        int reg_size = sizeof(uint32_t) * 8;
 
        gpe_reg_count = soc_fill_acpi_wake(ps, &pm1, &gpe0);
        if (gpe_reg_count < 0)
                return;
 
        /* Scan for first set bit in PM1 */
        for (index = 0; index < reg_size; index++) {
                if (pm1 & 1)
                        break;
                pm1 >>= 1;
        }
 
        if (index < 16)
                gnvs->pm1i = index;
 
        /* Scan for first set bit in GPE registers */
        for (gpe_reg = 0; gpe_reg < gpe_reg_count; gpe_reg++) {
                uint32_t gpe = gpe0[gpe_reg];
                int start = gpe_reg * reg_size;
                int end = start + reg_size;
 
                for (index = start; index < end; index++) {
                        if (gpe & 1)
                                break;
                        gpe >>= 1;
                }
        }
 
        if (index < gpe_reg_count * reg_size)
                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);
 
        printk(BIOS_DEBUG, "ACPI _SWS is PM1 Index %lld GPE Index %lld\n",
               (long long)gnvs->pm1i, (long long)gnvs->gpei);
}
 
BOOT_STATE_INIT_ENTRY(BS_PRE_DEVICE, BS_ON_ENTRY, acpi_save_wake_source, NULL);