mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 21:54:06 +08:00
9c5150b31b
Currently, CONFIG_RTC_SYSTOHC uses CONFIG_RTC_HCTOSYS_DEVICE which is originally used by CONFIG_RTC_HCTOSYS, but this rtc device has some limiations, for example, it must be battery-backed, be able to work with irq off and through system suspension, etc. So add CONFIG_RTC_SYSTOHC_DEVICE used exclusively for CONFIG_RTC_SYSTOHC, it is more lenient compared to CONFIG_RTC_HCTOSYS_DEVICE, and could be assigned any available RTC in the system. Default value is CONFIG_RTC_HCTOSYS_DEVICE which is "rtc0" by default. After this patch, NTP will sync up "rtc0" by default. Cc: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: Xunlei Pang <pang.xunlei@linaro.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
/*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published by
|
|
* the Free Software Foundation.
|
|
*
|
|
*/
|
|
#include <linux/rtc.h>
|
|
#include <linux/time.h>
|
|
|
|
/**
|
|
* rtc_set_ntp_time - Save NTP synchronized time to the RTC
|
|
* @now: Current time of day
|
|
*
|
|
* Replacement for the NTP platform function update_persistent_clock64
|
|
* that stores time for later retrieval by rtc_hctosys.
|
|
*
|
|
* Returns 0 on successful RTC update, -ENODEV if a RTC update is not
|
|
* possible at all, and various other -errno for specific temporary failure
|
|
* cases.
|
|
*
|
|
* If temporary failure is indicated the caller should try again 'soon'
|
|
*/
|
|
int rtc_set_ntp_time(struct timespec64 now)
|
|
{
|
|
struct rtc_device *rtc;
|
|
struct rtc_time tm;
|
|
int err = -ENODEV;
|
|
|
|
if (now.tv_nsec < (NSEC_PER_SEC >> 1))
|
|
rtc_time64_to_tm(now.tv_sec, &tm);
|
|
else
|
|
rtc_time64_to_tm(now.tv_sec + 1, &tm);
|
|
|
|
rtc = rtc_class_open(CONFIG_RTC_SYSTOHC_DEVICE);
|
|
if (rtc) {
|
|
/* rtc_hctosys exclusively uses UTC, so we call set_time here,
|
|
* not set_mmss. */
|
|
if (rtc->ops &&
|
|
(rtc->ops->set_time ||
|
|
rtc->ops->set_mmss64 ||
|
|
rtc->ops->set_mmss))
|
|
err = rtc_set_time(rtc, &tm);
|
|
rtc_class_close(rtc);
|
|
}
|
|
|
|
return err;
|
|
}
|