diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/lib/tsc_timer.c | 32 |
1 files changed, 21 insertions, 11 deletions
diff --git a/arch/x86/lib/tsc_timer.c b/arch/x86/lib/tsc_timer.c index f091c91669..fb9afed18f 100644 --- a/arch/x86/lib/tsc_timer.c +++ b/arch/x86/lib/tsc_timer.c @@ -36,7 +36,8 @@ DECLARE_GLOBAL_DATA_PTR; struct freq_desc { u8 x86_family; /* CPU family */ u8 x86_model; /* model */ - u8 msr_plat; /* 1: use MSR_PLATFORM_INFO, 0: MSR_IA32_PERF_STATUS */ + /* 2: use 100MHz, 1: use MSR_PLATFORM_INFO, 0: MSR_IA32_PERF_STATUS */ + u8 msr_plat; u32 freqs[MAX_NUM_FREQS]; }; @@ -49,6 +50,8 @@ static struct freq_desc freq_desc_tables[] = { { 6, 0x4a, 1, { 0, FREQ_100, FREQ_133, 0, 0, 0, 0, 0 } }, /* VLV2 */ { 6, 0x37, 1, { FREQ_83, FREQ_100, FREQ_133, FREQ_166, 0, 0, 0, 0 } }, + /* Ivybridge */ + { 6, 0x3a, 2, { 0, 0, 0, 0, 0, 0, 0, 0 } }, /* ANN */ { 6, 0x5a, 1, { FREQ_83, FREQ_100, FREQ_133, FREQ_100, 0, 0, 0, 0 } }, }; @@ -97,11 +100,18 @@ static unsigned long try_msr_calibrate_tsc(void) if (!ratio) goto fail; - /* Get FSB FREQ ID */ - rdmsr(MSR_FSB_FREQ, lo, hi); - freq_id = lo & 0x7; - freq = id_to_freq(cpu_index, freq_id); - debug("Resolved frequency ID: %u, frequency: %u KHz\n", freq_id, freq); + if (freq_desc_tables[cpu_index].msr_plat == 2) { + /* TODO: Figure out how best to deal with this */ + freq = FREQ_100; + debug("Using frequency: %u KHz\n", freq); + } else { + /* Get FSB FREQ ID */ + rdmsr(MSR_FSB_FREQ, lo, hi); + freq_id = lo & 0x7; + freq = id_to_freq(cpu_index, freq_id); + debug("Resolved frequency ID: %u, frequency: %u KHz\n", + freq_id, freq); + } if (!freq) goto fail; @@ -297,12 +307,12 @@ unsigned __attribute__((no_instrument_function)) long get_tbclk_mhz(void) return gd->arch.tsc_mhz; fast_calibrate = try_msr_calibrate_tsc(); - if (fast_calibrate) - return fast_calibrate; + if (!fast_calibrate) { - fast_calibrate = quick_pit_calibrate(); - if (!fast_calibrate) - panic("TSC frequency is ZERO"); + fast_calibrate = quick_pit_calibrate(); + if (!fast_calibrate) + panic("TSC frequency is ZERO"); + } gd->arch.tsc_mhz = fast_calibrate; return fast_calibrate; |