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soc/intel/skylake: refactor rtc failure checking

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In order to prepare for checking RTC failure in the early boot
paths move the rtc failure calculation to pmutil.c and add a helper
function to determine if failure occurred.

BUG=b:63054105

Change-Id: I88bf9bdba8c1f3a11bc8301869e3da9f033ec381
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/21554
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Aaron Durbin
2017-09-15 12:37:05 -06:00
parent bcd0bdabed
commit d1fc8c1343
3 changed files with 21 additions and 13 deletions
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17
src/soc/intel/skylake/pmutil.c
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@ -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;
}