powerpc: time-of-day fixes for 32-bit CHRP systems

This makes 32-bit CHRP systems use the RTAS time-of-day routines if
available.  It fixes a bug in the RTAS time-of-day routines where they
were storing a 64-bit timebase value in an unsigned long by making
those variables u64.  Also, the direct-access time-of-day routines
had the wrong convention for the month and year in the struct rtc_time.

Signed-off-by: Paul Mackerras <paulus@samba.org>

3 files changed, 14 insertions, 6 deletions

diff --git a/arch/powerpc/kernel/rtas-rtc.c b/arch/powerpc/kernel/rtas-rtc.c
index 7b948662704c..635d3b9a8811 100644
--- a/arch/powerpc/kernel/rtas-rtc.c
+++ b/arch/powerpc/kernel/rtas-rtc.c
@@ -15,7 +15,7 @@ unsigned long __init rtas_get_boot_time(void)
 {
         int ret[8];
         int error, wait_time;
-        unsigned long max_wait_tb;
+        u64 max_wait_tb;
 
         max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
         do {
@@ -45,7 +45,7 @@ void rtas_get_rtc_time(struct rtc_time *rtc_tm)
 {
         int ret[8];
         int error, wait_time;
-        unsigned long max_wait_tb;
+        u64 max_wait_tb;
 
         max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
         do {
@@ -80,7 +80,7 @@ void rtas_get_rtc_time(struct rtc_time *rtc_tm)
 int rtas_set_rtc_time(struct rtc_time *tm)
 {
         int error, wait_time;
-        unsigned long max_wait_tb;
+        u64 max_wait_tb;
 
         max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
         do {
diff --git a/arch/powerpc/platforms/chrp/setup.c b/arch/powerpc/platforms/chrp/setup.c
index 4099ddab9205..dda5f2c72c25 100644
--- a/arch/powerpc/platforms/chrp/setup.c
+++ b/arch/powerpc/platforms/chrp/setup.c
@@ -257,6 +257,13 @@ void __init chrp_setup_arch(void)
         if (rtas_token("display-character") >= 0)
                 ppc_md.progress = rtas_progress;
 
+        /* use RTAS time-of-day routines if available */
+        if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) {
+                ppc_md.get_boot_time    = rtas_get_boot_time;
+                ppc_md.get_rtc_time     = rtas_get_rtc_time;
+                ppc_md.set_rtc_time     = rtas_set_rtc_time;
+        }
+
 #ifdef CONFIG_BOOTX_TEXT
         if (ppc_md.progress == NULL && boot_text_mapped)
                 ppc_md.progress = btext_progress;
@@ -505,9 +512,11 @@ void __init chrp_init(void)
         ppc_md.halt           = rtas_halt;
 
         ppc_md.time_init      = chrp_time_init;
+        ppc_md.calibrate_decr = chrp_calibrate_decr;
+
+        /* this may get overridden with rtas routines later... */
         ppc_md.set_rtc_time   = chrp_set_rtc_time;
         ppc_md.get_rtc_time   = chrp_get_rtc_time;
-        ppc_md.calibrate_decr = chrp_calibrate_decr;
 
 #ifdef CONFIG_SMP
         smp_ops = &chrp_smp_ops;
diff --git a/arch/powerpc/platforms/chrp/time.c b/arch/powerpc/platforms/chrp/time.c
index 9e53535ddb82..737ee5d9f0aa 100644
--- a/arch/powerpc/platforms/chrp/time.c
+++ b/arch/powerpc/platforms/chrp/time.c
@@ -87,7 +87,6 @@ int chrp_set_rtc_time(struct rtc_time *tmarg)
 
         chrp_cmos_clock_write((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
 
-        tm.tm_year -= 1900;
         if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
                 BIN_TO_BCD(tm.tm_sec);
                 BIN_TO_BCD(tm.tm_min);
@@ -156,7 +155,7 @@ void chrp_get_rtc_time(struct rtc_time *tm)
                 BCD_TO_BIN(mon);
                 BCD_TO_BIN(year);
         }
-        if ((year += 1900) < 1970)
+        if (year < 70)
                 year += 100;
         tm->tm_sec = sec;
         tm->tm_min = min;