powerpc: Fix time code for 601 processors

The 601 doesn't have the timebase register; instead it has an RTCL
register that counts nanoseconds and wraps at 1000000000, and an
RTCU register that counts seconds.  This makes the necessary changes
for the merged time code to use the RTCL/U registers when the kernel
is running on a 601.

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

1 files changed, 13 insertions, 1 deletions

diff --git a/include/asm-powerpc/time.h b/include/asm-powerpc/time.h
index 99bfe3281768..410e795f7d43 100644
--- a/include/asm-powerpc/time.h
+++ b/include/asm-powerpc/time.h
@@ -30,7 +30,8 @@ extern unsigned long tb_ticks_per_usec;
 extern unsigned long tb_ticks_per_sec;
 extern u64 tb_to_xs;
 extern unsigned      tb_to_us;
-extern u64 tb_last_stamp;
+extern unsigned long tb_last_stamp;
+extern u64 tb_last_jiffy;
 
 DECLARE_PER_CPU(unsigned long, last_jiffy);
 
@@ -113,6 +114,17 @@ static inline unsigned int get_rtcl(void)
         return rtcl;
 }
 
+static inline u64 get_rtc(void)
+{
+        unsigned int hi, lo, hi2;
+
+        do {
+                asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
+                             : "=r" (hi), "=r" (lo), "=r" (hi2));
+        } while (hi2 != hi);
+        return (u64)hi * 1000000000 + lo;
+}
+
 #ifdef CONFIG_PPC64
 static inline u64 get_tb(void)
 {