| /* 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); |