| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2015 Google Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <arch/acpi.h> |
| #include <bootstate.h> |
| #include <cbmem.h> |
| #include <console/console.h> |
| #include <soc/nvs.h> |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include "acpi.h" |
| |
| __attribute__((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); |