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x86: Save TSC frequency in the global data

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Return the saved TSC frequency in get_tbclk_mhz().

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Bin Meng
2014-11-09 22:19:35 +08:00
committed by Simon Glass
parent 80de049561
commit 258b1357c6
2 changed files with 5 additions and 0 deletions
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1
arch/x86/include/asm/global_data.h
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@@ -21,6 +21,7 @@ struct arch_global_data {
uint64_t tsc_base; /* Initial value returned by rdtsc() */ uint64_t tsc_base; /* Initial value returned by rdtsc() */
uint32_t tsc_base_kclocks; /* Initial tsc as a kclocks value */ uint32_t tsc_base_kclocks; /* Initial tsc as a kclocks value */
uint32_t tsc_prev; /* For show_boot_progress() */ uint32_t tsc_prev; /* For show_boot_progress() */
uint32_t tsc_mhz; /* TSC frequency in MHz */
void *new_fdt; /* Relocated FDT */ void *new_fdt; /* Relocated FDT */
uint32_t bist; /* Built-in self test value */ uint32_t bist; /* Built-in self test value */
}; };

4
arch/x86/lib/tsc_timer.c
View File

@@ -293,6 +293,9 @@ unsigned __attribute__((no_instrument_function)) long get_tbclk_mhz(void)
{ {
unsigned long fast_calibrate; unsigned long fast_calibrate;
if (gd->arch.tsc_mhz)
return gd->arch.tsc_mhz;
fast_calibrate = try_msr_calibrate_tsc(); fast_calibrate = try_msr_calibrate_tsc();
if (fast_calibrate) if (fast_calibrate)
return fast_calibrate; return fast_calibrate;
@@ -301,6 +304,7 @@ unsigned __attribute__((no_instrument_function)) long get_tbclk_mhz(void)
if (!fast_calibrate) if (!fast_calibrate)
panic("TSC frequency is ZERO"); panic("TSC frequency is ZERO");
gd->arch.tsc_mhz = fast_calibrate;
return fast_calibrate; return fast_calibrate;
} }