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| author | Minkyu Kang <mk7.kang@samsung.com> | 2010-07-06 17:29:44 +0900 |
|---|---|---|
| committer | Minkyu Kang <mk7.kang@samsung.com> | 2010-07-06 17:29:44 +0900 |
| commit | 2271d3ddccfbd4a7640121669ff9b013b1fea361 (patch) | |
| tree | 400f22f0a12ff0ae6c472bed6ac648befc1744a2 /arch/sh/lib/time.c | |
| parent | 25ae8aeb54a6ca89ba1fd11c00865b8fed9348b4 (diff) | |
| parent | 54841ab50c20d6fa6c9cc3eb826989da3a22d934 (diff) | |
| download | u-boot-imx-2271d3ddccfbd4a7640121669ff9b013b1fea361.zip u-boot-imx-2271d3ddccfbd4a7640121669ff9b013b1fea361.tar.gz u-boot-imx-2271d3ddccfbd4a7640121669ff9b013b1fea361.tar.bz2 | |
Merge branch 'master' of git://git.denx.de/u-boot
Diffstat (limited to 'arch/sh/lib/time.c')
| -rw-r--r-- | arch/sh/lib/time.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/arch/sh/lib/time.c b/arch/sh/lib/time.c index 9a8f89a..bc1656f 100644 --- a/arch/sh/lib/time.c +++ b/arch/sh/lib/time.c @@ -2,7 +2,7 @@ * (C) Copyright 2009 * Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> * - * (C) Copyright 2007-2008 + * (C) Copyright 2007-2010 * Nobobuhiro Iwamatsu <iwamatsu@nigauri.org> * * (C) Copyright 2003 @@ -36,6 +36,8 @@ #define TMU_MAX_COUNTER (~0UL) static ulong timer_freq; +static unsigned long last_tcnt; +static unsigned long long overflow_ticks; static inline unsigned long long tick_to_time(unsigned long long tick) { @@ -97,12 +99,26 @@ int timer_init (void) tmu_timer_stop(0); tmu_timer_start(0); + last_tcnt = 0; + overflow_ticks = 0; + return 0; } unsigned long long get_ticks (void) { - return 0 - readl(TCNT0); + unsigned long tcnt = 0 - readl(TCNT0); + unsigned long ticks; + + if (last_tcnt > tcnt) { /* overflow */ + overflow_ticks++; + ticks = (0xffffffff - last_tcnt) + tcnt; + } else { + ticks = tcnt; + } + last_tcnt = tcnt; + + return (overflow_ticks << 32) | tcnt; } void __udelay (unsigned long usec) |