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powerpc: Fix time code for 601 processors

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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>
This commit is contained in:
Paul Mackerras
2005-10-23 17:14:56 +10:00
parent 985990137e
commit 96c4450760
2 changed files with 69 additions and 24 deletions
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14
include/asm-powerpc/time.h
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@@ -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)
{