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Diffstat (limited to 'arch/sh/boards/mpc1211/rtc.c')
-rw-r--r--arch/sh/boards/mpc1211/rtc.c50
1 files changed, 17 insertions, 33 deletions
diff --git a/arch/sh/boards/mpc1211/rtc.c b/arch/sh/boards/mpc1211/rtc.c
index 4d100f04807..a76c655dcee 100644
--- a/arch/sh/boards/mpc1211/rtc.c
+++ b/arch/sh/boards/mpc1211/rtc.c
@@ -9,36 +9,16 @@
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/time.h>
+#include <linux/bcd.h>
#include <linux/mc146818rtc.h>
-#ifndef BCD_TO_BIN
-#define BCD_TO_BIN(val) ((val)=((val)&15) + ((val)>>4)*10)
-#endif
-
-#ifndef BIN_TO_BCD
-#define BIN_TO_BCD(val) ((val)=(((val)/10)<<4) + (val)%10)
-#endif
-
-/* arc/i386/kernel/time.c */
unsigned long get_cmos_time(void)
{
unsigned int year, mon, day, hour, min, sec;
- int i;
spin_lock(&rtc_lock);
- /* The Linux interpretation of the CMOS clock register contents:
- * When the Update-In-Progress (UIP) flag goes from 1 to 0, the
- * RTC registers show the second which has precisely just started.
- * Let's hope other operating systems interpret the RTC the same way.
- */
- /* read RTC exactly on falling edge of update flag */
- for (i = 0 ; i < 1000000 ; i++) /* may take up to 1 second... */
- if (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP)
- break;
- for (i = 0 ; i < 1000000 ; i++) /* must try at least 2.228 ms */
- if (!(CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP))
- break;
- do { /* Isn't this overkill ? UIP above should guarantee consistency */
+
+ do {
sec = CMOS_READ(RTC_SECONDS);
min = CMOS_READ(RTC_MINUTES);
hour = CMOS_READ(RTC_HOURS);
@@ -46,18 +26,22 @@ unsigned long get_cmos_time(void)
mon = CMOS_READ(RTC_MONTH);
year = CMOS_READ(RTC_YEAR);
} while (sec != CMOS_READ(RTC_SECONDS));
- if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
- {
- BCD_TO_BIN(sec);
- BCD_TO_BIN(min);
- BCD_TO_BIN(hour);
- BCD_TO_BIN(day);
- BCD_TO_BIN(mon);
- BCD_TO_BIN(year);
- }
+
+ if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
+ BCD_TO_BIN(sec);
+ BCD_TO_BIN(min);
+ BCD_TO_BIN(hour);
+ BCD_TO_BIN(day);
+ BCD_TO_BIN(mon);
+ BCD_TO_BIN(year);
+ }
+
spin_unlock(&rtc_lock);
- if ((year += 1900) < 1970)
+
+ year += 1900;
+ if (year < 1970)
year += 100;
+
return mktime(year, mon, day, hour, min, sec);
}