diff options
| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2007-09-19 08:21:56 +0400 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2007-09-19 09:26:34 +0400 |
| commit | c27da339698145a9383e052c1070a950d30da478 (patch) | |
| tree | 817025c780b6be5d80405c90f4c5fb88086b6cb8 | |
| parent | 7b5acbaac3f94ab810a977c0ec4e5fcabbf51bed (diff) | |
| download | linux-c27da339698145a9383e052c1070a950d30da478.tar.xz | |
[POWERPC] Fix timekeeping on PowerPC 601
Recent changes to the timekeeping code broke support for the PowerPC 601
processor which doesn't have the usual timebase facility but a slightly
different thing called (yuck) the RTC.
This fixes it, boot tested on an old 601 based PowerMac 7200.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
| -rw-r--r-- | arch/powerpc/kernel/time.c | 8 | ||||
| -rw-r--r-- | include/asm-powerpc/time.h | 5 |
2 files changed, 10 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index 727a6699f2f4..c627cf86d1e3 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -239,7 +239,7 @@ static void snapshot_tb_and_purr(void *data) struct cpu_purr_data *p = &__get_cpu_var(cpu_purr_data); local_irq_save(flags); - p->tb = mftb(); + p->tb = get_tb_or_rtc(); p->purr = mfspr(SPRN_PURR); wmb(); p->initialized = 1; @@ -317,7 +317,7 @@ static void snapshot_purr(void) */ void snapshot_timebase(void) { - __get_cpu_var(last_jiffy) = get_tb(); + __get_cpu_var(last_jiffy) = get_tb_or_rtc(); snapshot_purr(); } @@ -684,6 +684,8 @@ void timer_interrupt(struct pt_regs * regs) write_seqlock(&xtime_lock); tb_next_jiffy = tb_last_jiffy + tb_ticks_per_jiffy; + if (__USE_RTC() && tb_next_jiffy >= 1000000000) + tb_next_jiffy -= 1000000000; if (per_cpu(last_jiffy, cpu) >= tb_next_jiffy) { tb_last_jiffy = tb_next_jiffy; do_timer(1); @@ -977,7 +979,7 @@ void __init time_init(void) tb_to_ns_scale = scale; tb_to_ns_shift = shift; /* Save the current timebase to pretty up CONFIG_PRINTK_TIME */ - boot_tb = get_tb(); + boot_tb = get_tb_or_rtc(); tm = get_boot_time(); diff --git a/include/asm-powerpc/time.h b/include/asm-powerpc/time.h index d7f5ddfbaac7..c104c15c6625 100644 --- a/include/asm-powerpc/time.h +++ b/include/asm-powerpc/time.h @@ -149,6 +149,11 @@ static inline u64 get_tb(void) } #endif /* !CONFIG_PPC64 */ +static inline u64 get_tb_or_rtc(void) +{ + return __USE_RTC() ? get_rtc() : get_tb(); +} + static inline void set_tb(unsigned int upper, unsigned int lower) { mtspr(SPRN_TBWL, 0); |