src/southbridge/intel/bd82x6x/early_pch_common.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2008-2009 coresystems GmbH
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; version 2 of
   9  * the License.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <arch/io.h>
  18 #include <timestamp.h>
  19 #include <cpu/x86/tsc.h>
  20 #include "pch.h"
  21 #include <arch/acpi.h>
  22 #include <console/console.h>
  23
  24 uint64_t get_initial_timestamp(void)
  25 {
  26         tsc_t base_time = {
  27                 .lo = pci_read_config32(PCI_DEV(0, 0x00, 0), 0xdc),
  28                 .hi = pci_read_config32(PCI_DEV(0, 0x1f, 2), 0xd0)
  29         };
  30         return tsc_to_uint64(base_time);
  31 }
  32
  33 int southbridge_detect_s3_resume(void)
  34 {
  35         u32 pm1_cnt;
  36         u16 pm1_sts;
  37
  38         /* Check PM1_STS[15] to see if we are waking from Sx */
  39         pm1_sts = inw(DEFAULT_PMBASE + PM1_STS);
  40
  41         /* Read PM1_CNT[12:10] to determine which Sx state */
  42         pm1_cnt = inl(DEFAULT_PMBASE + PM1_CNT);
  43
  44         if ((pm1_sts & WAK_STS) && ((pm1_cnt >> 10) & 7) == 5) {
  45                 if (acpi_s3_resume_allowed()) {
  46                         printk(BIOS_DEBUG, "Resume from S3 detected.\n");
  47                         /* Clear SLP_TYPE. This will break stage2 but
  48                          * we care for that when we get there.
  49                          */
  50                         outl(pm1_cnt & ~(7 << 10), DEFAULT_PMBASE + PM1_CNT);
  51                         return 1;
  52                 } else {
  53                         printk(BIOS_DEBUG, "Resume from S3 detected, but disabled.\n");
  54                 }
  55         }
  56
  57         return 0;
  58 }