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/* SPDX-License-Identifier: GPL-2.0-only */
#include <acpi/acpi.h>
#include <acpi/acpi_gnvs.h>
#include <acpi/acpi_pm.h>
#include <bootstate.h>
#include <console/console.h>
#include <device/device.h>
#include <string.h>
#include <soc/nvs.h>
#include <soc/pm.h>
#include <soc/intel/broadwell/chip.h>
/* Save bit index for PM1_STS and GPE_STS for ACPI _SWS */
static void pm_fill_gnvs(struct global_nvs *gnvs, const struct chipset_power_state *ps)
{
uint16_t pm1;
int gpe_reg;
pm1 = ps->pm1_sts & ps->pm1_en;
/* Scan for first set bit in PM1 */
for (gnvs->pm1i = 0; gnvs->pm1i < 16; 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 */
gnvs->gpei = -1;
for (gpe_reg = 0; gpe_reg < GPE0_REG_MAX; gpe_reg++) {
u32 gpe = ps->gpe0_sts[gpe_reg] & ps->gpe0_en[gpe_reg];
int start = gpe_reg * GPE0_REG_SIZE;
int end = start + GPE0_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 >= (GPE0_REG_MAX * GPE0_REG_SIZE))
gnvs->gpei = -1;
printk(BIOS_DEBUG, "ACPI _SWS is PM1 Index %lld GPE Index %lld\n",
gnvs->pm1i, gnvs->gpei);
}
static void acpi_save_wake_source(void *unused)
{
const struct chipset_power_state *ps;
struct global_nvs *gnvs = acpi_get_gnvs();
if (!gnvs)
return;
if (acpi_pm_state_for_wake(&ps) < 0)
return;
pm_fill_gnvs(gnvs, ps);
}
BOOT_STATE_INIT_ENTRY(BS_OS_RESUME, BS_ON_ENTRY, acpi_save_wake_source, NULL);
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