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| author | Huacai Chen <chenhc@lemote.com> | 2014-11-04 14:15:31 +0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2014-11-24 07:45:02 +0100 |
| commit | e292ccde216e571faad475e4331c188f22a28182 (patch) | |
| tree | 18bd2792fa52b3cd3f1aa2bc305262b75f80d8f8 /arch/mips/loongson/common | |
| parent | 89467e73d3881a470ce4ffdcba1d5a5ed618379a (diff) | |
| download | linux-e292ccde216e571faad475e4331c188f22a28182.tar.gz linux-e292ccde216e571faad475e4331c188f22a28182.tar.bz2 linux-e292ccde216e571faad475e4331c188f22a28182.zip | |
MIPS: Loongson-3: Add RS780/SBX00 HPET support
CPUFreq driver need external timer, so add hpet at first.
In Loongson 3, only Core-0 can receive external interrupt. As a result,
timekeeping cannot absolutely use HPET timer. We use a hybrid solution:
Core-0 use HPET as its clock event device, but other cores still use
MIPS; clock source is global and doesn't need interrupt, so use HPET.
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Hongliang Tao <taohl@lemote.com>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/8329/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/loongson/common')
| -rw-r--r-- | arch/mips/loongson/common/time.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/mips/loongson/common/time.c b/arch/mips/loongson/common/time.c index 262a1f65b05e..e1a5382ad47e 100644 --- a/arch/mips/loongson/common/time.c +++ b/arch/mips/loongson/common/time.c @@ -12,6 +12,7 @@ */ #include <asm/mc146818-time.h> #include <asm/time.h> +#include <asm/hpet.h> #include <loongson.h> #include <cs5536/cs5536_mfgpt.h> @@ -21,7 +22,11 @@ void __init plat_time_init(void) /* setup mips r4k timer */ mips_hpt_frequency = cpu_clock_freq / 2; +#ifdef CONFIG_RS780_HPET + setup_hpet_timer(); +#else setup_mfgpt0_timer(); +#endif } void read_persistent_clock(struct timespec *ts) |