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atrtc: export function to set RTC

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This is going to be used by the Xen clock on Dom0 in order to set the RTC of
the host. The current logic in atrtc_settime is moved to atrtc_set and the
unused device_t parameter is removed from the atrtc_set function call so it
can be safely used by other callers.

Sponsored by:		Citrix Systems R&D
Reviewed by:		kib, jhb
Differential revision:	https://reviews.freebsd.org/D6067
This commit is contained in:
Roger Pau Monné 2016-05-02 16:14:55 +00:00
parent af5bb69c5a
commit f65466eb3a
2 changed files with 29 additions and 21 deletions
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1
sys/isa/rtc.h
View File

@ -117,6 +117,7 @@ extern int atrtcclock_disable;
int rtcin(int reg);
void atrtc_restore(void);
void writertc(int reg, u_char val);
void atrtc_set(struct timespec *ts);
#endif
#endif /* _I386_ISA_RTC_H_ */

49
sys/x86/isa/atrtc.c
View File

@ -151,6 +151,33 @@ atrtc_restore(void)
rtcin(RTC_INTR);
}
void
atrtc_set(struct timespec *ts)
{
struct clocktime ct;
clock_ts_to_ct(ts, &ct);
/* Disable RTC updates and interrupts. */
writertc(RTC_STATUSB, RTCSB_HALT | RTCSB_24HR);
writertc(RTC_SEC, bin2bcd(ct.sec)); /* Write back Seconds */
writertc(RTC_MIN, bin2bcd(ct.min)); /* Write back Minutes */
writertc(RTC_HRS, bin2bcd(ct.hour)); /* Write back Hours */
writertc(RTC_WDAY, ct.dow + 1); /* Write back Weekday */
writertc(RTC_DAY, bin2bcd(ct.day)); /* Write back Day */
writertc(RTC_MONTH, bin2bcd(ct.mon)); /* Write back Month */
writertc(RTC_YEAR, bin2bcd(ct.year % 100)); /* Write back Year */
#ifdef USE_RTC_CENTURY
writertc(RTC_CENTURY, bin2bcd(ct.year / 100)); /* ... and Century */
#endif
/* Re-enable RTC updates and interrupts. */
writertc(RTC_STATUSB, rtc_statusb);
rtcin(RTC_INTR);
}
/**********************************************************************
* RTC driver for subr_rtc
*/
@ -297,28 +324,8 @@ atrtc_resume(device_t dev)
static int
atrtc_settime(device_t dev __unused, struct timespec *ts)
{
struct clocktime ct;
clock_ts_to_ct(ts, &ct);
/* Disable RTC updates and interrupts. */
writertc(RTC_STATUSB, RTCSB_HALT | RTCSB_24HR);
writertc(RTC_SEC, bin2bcd(ct.sec)); /* Write back Seconds */
writertc(RTC_MIN, bin2bcd(ct.min)); /* Write back Minutes */
writertc(RTC_HRS, bin2bcd(ct.hour)); /* Write back Hours */
writertc(RTC_WDAY, ct.dow + 1); /* Write back Weekday */
writertc(RTC_DAY, bin2bcd(ct.day)); /* Write back Day */
writertc(RTC_MONTH, bin2bcd(ct.mon)); /* Write back Month */
writertc(RTC_YEAR, bin2bcd(ct.year % 100)); /* Write back Year */
#ifdef USE_RTC_CENTURY
writertc(RTC_CENTURY, bin2bcd(ct.year / 100)); /* ... and Century */
#endif
/* Reenable RTC updates and interrupts. */
writertc(RTC_STATUSB, rtc_statusb);
rtcin(RTC_INTR);
atrtc_set(ts);
return (0);
}