src/southbridge/intel/common/rtc.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #define __SIMPLE_DEVICE__
   4
   5 #include <console/console.h>
   6 #include <device/pci_ops.h>
   7 #include <device/pci_type.h>
   8 #include <elog.h>
   9 #include <pc80/mc146818rtc.h>
  10 #include <security/vboot/vbnv.h>
  11
  12 #include "pmutil.h"
  13 #include "rtc.h"
  14
  15 #define PCH_LPC_DEV     PCI_DEV(0, 0x1f, 0)
  16
  17 int rtc_failure(void)
  18 {
  19         return !!(pci_read_config8(PCH_LPC_DEV, D31F0_GEN_PMCON_3) & RTC_BATTERY_DEAD);
  20 }
  21
  22 void sb_rtc_init(void)
  23 {
  24         int rtc_failed = rtc_failure();
  25
  26         if (rtc_failed) {
  27                 if (CONFIG(ELOG))
  28                         elog_add_event(ELOG_TYPE_RTC_RESET);
  29                 pci_update_config8(PCH_LPC_DEV, D31F0_GEN_PMCON_3,
  30                                    ~RTC_BATTERY_DEAD, 0);
  31         }
  32
  33         printk(BIOS_DEBUG, "RTC: failed = 0x%x\n", rtc_failed);
  34
  35         cmos_init(rtc_failed);
  36 }
  37
  38 int vbnv_cmos_failed(void)
  39 {
  40         return rtc_failure();
  41 }