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authorSylvain Chouleur <sylvain.chouleur@intel.com>2015-06-08 11:45:19 +0200
committerAlexandre Belloni <alexandre.belloni@free-electrons.com>2015-09-05 13:19:09 +0200
commit3c217e51d8a272b9301058fe845d6c69cc0651cb (patch)
tree19905089bba8bb8b295b1916b059b8c14b46cbba /include/asm-generic
parent11f67a8bbf65872c3e9edc70242420a8c314a860 (diff)
rtc: cmos: century support
If century field is supported by the RTC CMOS device, then we should use it and then do not consider years greater that 169 as an error. For information, the year field of the rtc_time structure contains the value to add to 1970 to obtain the current year. This was a hack to be able to support years for 1970 to 2069. This patch remains compatible with this implementation. Signed-off-by: Sylvain Chouleur <sylvain.chouleur@intel.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Diffstat (limited to 'include/asm-generic')
-rw-r--r--include/asm-generic/rtc.h29
1 files changed, 29 insertions, 0 deletions
diff --git a/include/asm-generic/rtc.h b/include/asm-generic/rtc.h
index fa86f240c874..4e3b6558331e 100644
--- a/include/asm-generic/rtc.h
+++ b/include/asm-generic/rtc.h
@@ -16,6 +16,9 @@
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/delay.h>
+#ifdef CONFIG_ACPI
+#include <linux/acpi.h>
+#endif
#define RTC_PIE 0x40 /* periodic interrupt enable */
#define RTC_AIE 0x20 /* alarm interrupt enable */
@@ -46,6 +49,7 @@ static inline unsigned int __get_rtc_time(struct rtc_time *time)
{
unsigned char ctrl;
unsigned long flags;
+ unsigned char century = 0;
#ifdef CONFIG_MACH_DECSTATION
unsigned int real_year;
@@ -79,6 +83,11 @@ static inline unsigned int __get_rtc_time(struct rtc_time *time)
#ifdef CONFIG_MACH_DECSTATION
real_year = CMOS_READ(RTC_DEC_YEAR);
#endif
+#ifdef CONFIG_ACPI
+ if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
+ acpi_gbl_FADT.century)
+ century = CMOS_READ(acpi_gbl_FADT.century);
+#endif
ctrl = CMOS_READ(RTC_CONTROL);
spin_unlock_irqrestore(&rtc_lock, flags);
@@ -90,12 +99,16 @@ static inline unsigned int __get_rtc_time(struct rtc_time *time)
time->tm_mday = bcd2bin(time->tm_mday);
time->tm_mon = bcd2bin(time->tm_mon);
time->tm_year = bcd2bin(time->tm_year);
+ century = bcd2bin(century);
}
#ifdef CONFIG_MACH_DECSTATION
time->tm_year += real_year - 72;
#endif
+ if (century)
+ time->tm_year += (century - 19) * 100;
+
/*
* Account for differences between how the RTC uses the values
* and how they are defined in a struct rtc_time;
@@ -122,6 +135,7 @@ static inline int __set_rtc_time(struct rtc_time *time)
#ifdef CONFIG_MACH_DECSTATION
unsigned int real_yrs, leap_yr;
#endif
+ unsigned char century = 0;
yrs = time->tm_year;
mon = time->tm_mon + 1; /* tm_mon starts at zero */
@@ -150,6 +164,15 @@ static inline int __set_rtc_time(struct rtc_time *time)
yrs = 73;
}
#endif
+
+#ifdef CONFIG_ACPI
+ if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
+ acpi_gbl_FADT.century) {
+ century = (yrs + 1900) / 100;
+ yrs %= 100;
+ }
+#endif
+
/* These limits and adjustments are independent of
* whether the chip is in binary mode or not.
*/
@@ -169,6 +192,7 @@ static inline int __set_rtc_time(struct rtc_time *time)
day = bin2bcd(day);
mon = bin2bcd(mon);
yrs = bin2bcd(yrs);
+ century = bin2bcd(century);
}
save_control = CMOS_READ(RTC_CONTROL);
@@ -185,6 +209,11 @@ static inline int __set_rtc_time(struct rtc_time *time)
CMOS_WRITE(hrs, RTC_HOURS);
CMOS_WRITE(min, RTC_MINUTES);
CMOS_WRITE(sec, RTC_SECONDS);
+#ifdef CONFIG_ACPI
+ if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
+ acpi_gbl_FADT.century)
+ CMOS_WRITE(century, acpi_gbl_FADT.century);
+#endif
CMOS_WRITE(save_control, RTC_CONTROL);
CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);

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