diff options
Diffstat (limited to 'src/soc/intel/skylake/pmutil.c')
| -rw-r--r-- | src/soc/intel/skylake/pmutil.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/soc/intel/skylake/pmutil.c b/src/soc/intel/skylake/pmutil.c index fa2dc2d039..6ab949ba57 100644 --- a/src/soc/intel/skylake/pmutil.c +++ b/src/soc/intel/skylake/pmutil.c @@ -541,3 +541,20 @@ void pmc_gpe_init(void) enable_all_gpe(config->gpe0_en_1, config->gpe0_en_2, config->gpe0_en_3, config->gpe0_en_4); } + +int rtc_failure(void) +{ + u8 reg8; + int rtc_failed; + /* PMC Controller Device 0x1F, Func 02 */ + device_t dev = PCH_DEV_PMC; + reg8 = pci_read_config8(dev, GEN_PMCON_B); + rtc_failed = reg8 & RTC_BATTERY_DEAD; + if (rtc_failed) { + reg8 &= ~RTC_BATTERY_DEAD; + pci_write_config8(dev, GEN_PMCON_B, reg8); + printk(BIOS_DEBUG, "rtc_failed = 0x%x\n", rtc_failed); + } + + return !!rtc_failed; +} |