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| author | Bin Meng <bmeng.cn@gmail.com> | 2014-11-09 22:19:25 +0800 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2014-11-21 07:24:10 +0100 |
| commit | 80de049561f4d560c50341562b7e93ff45a1d8a0 (patch) | |
| tree | 59476e1b5be2f28b175eba341705f3df13036cab /arch/x86/include | |
| parent | 076bb44b0ef85747fec786a930335956614fb7d6 (diff) | |
| download | u-boot-imx-80de049561f4d560c50341562b7e93ff45a1d8a0.zip u-boot-imx-80de049561f4d560c50341562b7e93ff45a1d8a0.tar.gz u-boot-imx-80de049561f4d560c50341562b7e93ff45a1d8a0.tar.bz2 | |
x86: Add quick TSC calibration via PIT
Use the same way that Linux does for quick TSC calibration via PIT
when calibration via MSR fails.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/i8254.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/include/asm/i8254.h b/arch/x86/include/asm/i8254.h index c3ccd4f..4116de1 100644 --- a/arch/x86/include/asm/i8254.h +++ b/arch/x86/include/asm/i8254.h @@ -36,4 +36,7 @@ #define PIT_CMD_MODE4 0x08 /* Select mode 4 */ #define PIT_CMD_MODE5 0x0A /* Select mode 5 */ +/* The clock frequency of the i8253/i8254 PIT */ +#define PIT_TICK_RATE 1193182ul + #endif |