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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <acpi/acpi.h>
#include <bootstate.h>
#include <cbmem.h>
#include <console/console.h>
#include <soc/nvs.h>
#include <stdint.h>
#include "acpi.h"
__weak int soc_fill_acpi_wake(uint32_t *pm1, uint32_t **gpe0)
{
return -1;
}
/* Save wake source data for ACPI _SWS methods in NVS */
static void acpi_save_wake_source(void *unused)
{
global_nvs_t *gnvs = cbmem_find(CBMEM_ID_ACPI_GNVS);
uint32_t pm1, *gpe0;
int gpe_reg, gpe_reg_count;
int reg_size = sizeof(uint32_t) * 8;
if (!gnvs)
return;
gnvs->pm1i = -1;
gnvs->gpei = -1;
gpe_reg_count = soc_fill_acpi_wake(&pm1, &gpe0);
if (gpe_reg_count < 0)
return;
/* Scan for first set bit in PM1 */
for (gnvs->pm1i = 0; gnvs->pm1i < reg_size; gnvs->pm1i++) {
if (pm1 & 1)
break;
pm1 >>= 1;
}
/* If unable to determine then return -1 */
if (gnvs->pm1i >= 16)
gnvs->pm1i = -1;
/* 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;
if (gpe == 0) {
if (!gnvs->gpei)
gnvs->gpei = end;
continue;
}
for (gnvs->gpei = start; gnvs->gpei < end; gnvs->gpei++) {
if (gpe & 1)
break;
gpe >>= 1;
}
}
/* If unable to determine then return -1 */
if (gnvs->gpei >= gpe_reg_count * reg_size)
gnvs->gpei = -1;
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_OS_RESUME, BS_ON_ENTRY, acpi_save_wake_source, NULL);
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