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| author | Austin Zhang <austin.zhang@dell.com> | 2022-01-13 17:13:25 +0000 |
|---|---|---|
| committer | Eric van Gyzen <vangyzen@FreeBSD.org> | 2022-01-13 17:24:00 +0000 |
| commit | e1ef6c0ef256f797d629b9490db3f0034b28ae43 (patch) | |
| tree | 5ef04bc3a4554a47e348cbffc9c5bef53459410d /sys/x86 | |
| parent | 900a792250c2e8824ce7ebc49fef59ba6e82c9a4 (diff) | |
| download | src-e1ef6c0ef256f797d629b9490db3f0034b28ae43.tar.gz src-e1ef6c0ef256f797d629b9490db3f0034b28ae43.zip | |
atrtc: reads Century field from FADT table
The ACPI spec describes the FADT->Century field as:
The RTC CMOS RAM index to the century of data value (hundred and
thousand year decimals). If this field contains a zero, then the
RTC centenary feature is not supported. If this field has a non-zero
value, then this field contains an index into RTC RAM space that
OSPM can use to program the centenary field.
Use this field to decide whether to program the CENTURY register
of the CMOS RTC device.
Reviewed by: akumar3@isilon.com, dab, vangyzen
MFC after: 1 week
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D33667
MFC after: 1 week
Sponsored by: Dell EMC Isilon
Diffstat (limited to 'sys/x86')
| -rw-r--r-- | sys/x86/isa/atrtc.c | 37 |
1 files changed, 31 insertions, 6 deletions
diff --git a/sys/x86/isa/atrtc.c b/sys/x86/isa/atrtc.c index cad8015435d0..aff838c53851 100644 --- a/sys/x86/isa/atrtc.c +++ b/sys/x86/isa/atrtc.c @@ -79,6 +79,7 @@ MTX_SYSINIT(atrtc_time_lock_init, &atrtc_time_lock, "atrtc_time", MTX_DEF); int atrtcclock_disable = 0; +static int rtc_century = 0; static int rtc_reg = -1; static u_char rtc_statusa = RTCSA_DIVIDER | RTCSA_NOPROF; static u_char rtc_statusb = RTCSB_24HR; @@ -421,6 +422,31 @@ atrtc_acpi_disabled(void) } static int +rtc_acpi_century_get(void) +{ +#ifdef DEV_ACPI + ACPI_TABLE_FADT *fadt; + vm_paddr_t physaddr; + int century; + + physaddr = acpi_find_table(ACPI_SIG_FADT); + if (physaddr == 0) + return (0); + + fadt = acpi_map_table(physaddr, ACPI_SIG_FADT); + if (fadt == NULL) + return (0); + + century = fadt->Century; + acpi_unmap_table(fadt); + + return (century); +#else + return (0); +#endif +} + +static int atrtc_probe(device_t dev) { int result; @@ -435,6 +461,7 @@ atrtc_probe(device_t dev) device_set_desc(dev, "AT realtime clock"); return (BUS_PROBE_LOW_PRIORITY); } + rtc_century = rtc_acpi_century_get(); return (result); } @@ -548,9 +575,8 @@ atrtc_settime(device_t dev __unused, struct timespec *ts) rtcout_locked(RTC_DAY, bct.day); rtcout_locked(RTC_MONTH, bct.mon); rtcout_locked(RTC_YEAR, bct.year & 0xff); -#ifdef USE_RTC_CENTURY - rtcout_locked(RTC_CENTURY, bct.year >> 8); -#endif + if (rtc_century) + rtcout_locked(rtc_century, bct.year >> 8); /* * Re-enable RTC updates and interrupts. @@ -592,9 +618,8 @@ atrtc_gettime(device_t dev, struct timespec *ts) bct.day = rtcin_locked(RTC_DAY); bct.mon = rtcin_locked(RTC_MONTH); bct.year = rtcin_locked(RTC_YEAR); -#ifdef USE_RTC_CENTURY - bct.year |= rtcin_locked(RTC_CENTURY) << 8; -#endif + if (rtc_century) + bct.year |= rtcin_locked(rtc_century) << 8; mtx_unlock_spin(&atrtc_lock); mtx_unlock(&atrtc_time_lock); /* dow is unused in timespec conversion and we have no nsec info. */ |