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>
diff --git a/include/asm-powerpc/time.h b/include/asm-powerpc/time.h
index 99bfe32..410e795 100644
--- a/include/asm-powerpc/time.h
+++ b/include/asm-powerpc/time.h
@@ -30,7 +30,8 @@
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 @@
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)
{