[MIPS] Switch from to_tm to rtc_time_to_tm

This replaces the MIPS-specific to_tm function with the generic
rtc_time_to_tm function.  The big difference between the two functions is
that rtc_time_to_tm uses epoch 70 while to_tm uses 1970, so the result of
rtc_time_to_tm needs to be fixed up.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

6 files changed, 14 insertions, 56 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index c024113ce280..0cd0f835b13d 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -3,6 +3,7 @@ config MIPS
         default y
         # Horrible source of confusion.  Die, die, die ...
         select EMBEDDED
+        select RTC_LIB
 
 mainmenu "Linux/MIPS Kernel Configuration"
 
diff --git a/arch/mips/kernel/time.c b/arch/mips/kernel/time.c
index 9bbbd9b327fc..c48ebd4b495e 100644
--- a/arch/mips/kernel/time.c
+++ b/arch/mips/kernel/time.c
@@ -397,52 +397,3 @@ void __init time_init(void)
 
         init_mips_clocksource();
 }
-
-#define FEBRUARY                2
-#define STARTOFTIME             1970
-#define SECDAY                  86400L
-#define SECYR                   (SECDAY * 365)
-#define leapyear(y)             ((!((y) % 4) && ((y) % 100)) || !((y) % 400))
-#define days_in_year(y)         (leapyear(y) ? 366 : 365)
-#define days_in_month(m)        (month_days[(m) - 1])
-
-static int month_days[12] = {
-        31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
-};
-
-void to_tm(unsigned long tim, struct rtc_time *tm)
-{
-        long hms, day, gday;
-        int i;
-
-        gday = day = tim / SECDAY;
-        hms = tim % SECDAY;
-
-        /* Hours, minutes, seconds are easy */
-        tm->tm_hour = hms / 3600;
-        tm->tm_min = (hms % 3600) / 60;
-        tm->tm_sec = (hms % 3600) % 60;
-
-        /* Number of years in days */
-        for (i = STARTOFTIME; day >= days_in_year(i); i++)
-                day -= days_in_year(i);
-        tm->tm_year = i;
-
-        /* Number of months in days left */
-        if (leapyear(tm->tm_year))
-                days_in_month(FEBRUARY) = 29;
-        for (i = 1; day >= days_in_month(i); i++)
-                day -= days_in_month(i);
-        days_in_month(FEBRUARY) = 28;
-        tm->tm_mon = i - 1;             /* tm_mon starts from 0 to 11 */
-
-        /* Days are what is left over (+1) from all that. */
-        tm->tm_mday = day + 1;
-
-        /*
-         * Determine the day of week
-         */
-        tm->tm_wday = (gday + 4) % 7;   /* 1970/1/1 was Thursday */
-}
-
-EXPORT_SYMBOL(to_tm);
diff --git a/arch/mips/pmc-sierra/yosemite/setup.c b/arch/mips/pmc-sierra/yosemite/setup.c
index 56bf69595da8..015fcc363dc0 100644
--- a/arch/mips/pmc-sierra/yosemite/setup.c
+++ b/arch/mips/pmc-sierra/yosemite/setup.c
@@ -100,8 +100,12 @@ int rtc_mips_set_time(unsigned long tim)
         struct rtc_time tm;
         unsigned long flags;
 
-        /* convert to a more useful format -- note months count from 0 */
-        to_tm(sec, &tm);
+        /*
+         * Convert to a more useful format -- note months count from 0
+         * and years from 1900
+         */
+        rtc_time_to_tm(tim, &tm);
+        tm.tm_year += 1900;
         tm.tm_mon += 1;
 
         spin_lock_irqsave(&rtc_lock, flags);
diff --git a/arch/mips/sgi-ip22/ip22-time.c b/arch/mips/sgi-ip22/ip22-time.c
index 0387c385b4b2..c49418067f93 100644
--- a/arch/mips/sgi-ip22/ip22-time.c
+++ b/arch/mips/sgi-ip22/ip22-time.c
@@ -29,7 +29,7 @@
 #include <asm/sgi/ip22.h>
 
 /*
- * note that mktime uses month from 1 to 12 while to_tm
+ * Note that mktime uses month from 1 to 12 while rtc_time_to_tm
  * uses 0 to 11.
  */
 unsigned long read_persistent_clock(void)
@@ -66,10 +66,10 @@ int rtc_mips_set_time(unsigned long tim)
         unsigned int save_control;
         unsigned long flags;
 
-        to_tm(tim, &tm);
+        rtc_time_to_tm(tim, &tm);
 
         tm.tm_mon += 1;         /* tm_mon starts at zero */
-        tm.tm_year -= 1940;
+        tm.tm_year -= 40;
         if (tm.tm_year >= 100)
                 tm.tm_year -= 100;
 
diff --git a/arch/mips/sibyte/swarm/rtc_m41t81.c b/arch/mips/sibyte/swarm/rtc_m41t81.c
index c13914bdda59..26fbff4c15b1 100644
--- a/arch/mips/sibyte/swarm/rtc_m41t81.c
+++ b/arch/mips/sibyte/swarm/rtc_m41t81.c
@@ -146,7 +146,8 @@ int m41t81_set_time(unsigned long t)
         struct rtc_time tm;
         unsigned long flags;
 
-        to_tm(t, &tm);
+        /* Note we don't care about the century */
+        rtc_time_to_tm(t, &tm);
 
         /*
          * Note the write order matters as it ensures the correctness.
diff --git a/arch/mips/sibyte/swarm/rtc_xicor1241.c b/arch/mips/sibyte/swarm/rtc_xicor1241.c
index f4a178836415..ff3e5dabb348 100644
--- a/arch/mips/sibyte/swarm/rtc_xicor1241.c
+++ b/arch/mips/sibyte/swarm/rtc_xicor1241.c
@@ -115,7 +115,8 @@ int xicor_set_time(unsigned long t)
         int tmp;
         unsigned long flags;
 
-        to_tm(t, &tm);
+        rtc_time_to_tm(t, &tm);
+        tm.tm_year += 1900;
 
         spin_lock_irqsave(&rtc_lock, flags);
         /* unlock writes to the CCR */