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linux-next/arch/x86/kernel/tsc_msr.c
Len Brown 05680e7fa8 x86/tsc_msr: Correct Silvermont reference clock values
Atom processors use a 19.2 MHz crystal oscillator.

Early processors generate 100 MHz via 19.2 MHz * 26 / 5 = 99.84 MHz.

Later preocessor generate 100 MHz via 19.2 MHz * 125 / 24 = 100 MHz.

Update the Silvermont-based tables accordingly,
matching the Software Developers Manual.

Also, correct a 166 MHz entry that should have been 116 MHz,
and add a missing 80 MHz entry.

Reported-by: Stephane Gasparini <stephane.gasparini@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/5d7561655dfb066ff10801b423405bae4d1cfbe2.1466138954.git.len.brown@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-07-10 17:00:13 +02:00

102 lines
2.7 KiB
C

/*
* tsc_msr.c - TSC frequency enumeration via MSR
*
* Copyright (C) 2013 Intel Corporation
* Author: Bin Gao <bin.gao@intel.com>
*
* This file is released under the GPLv2.
*/
#include <linux/kernel.h>
#include <asm/processor.h>
#include <asm/setup.h>
#include <asm/apic.h>
#include <asm/param.h>
#define MAX_NUM_FREQS 8
/*
* If MSR_PERF_STAT[31] is set, the maximum resolved bus ratio can be
* read in MSR_PLATFORM_ID[12:8], otherwise in MSR_PERF_STAT[44:40].
* Unfortunately some Intel Atom SoCs aren't quite compliant to this,
* so we need manually differentiate SoC families. This is what the
* field msr_plat does.
*/
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 */
u32 freqs[MAX_NUM_FREQS];
};
static struct freq_desc freq_desc_tables[] = {
/* PNW */
{ 6, 0x27, 0, { 0, 0, 0, 0, 0, 99840, 0, 83200 } },
/* CLV+ */
{ 6, 0x35, 0, { 0, 133200, 0, 0, 0, 99840, 0, 83200 } },
/* TNG - Intel Atom processor Z3400 series */
{ 6, 0x4a, 1, { 0, 100000, 133300, 0, 0, 0, 0, 0 } },
/* VLV2 - Intel Atom processor E3000, Z3600, Z3700 series */
{ 6, 0x37, 1, { 83300, 100000, 133300, 116700, 80000, 0, 0, 0 } },
/* ANN - Intel Atom processor Z3500 series */
{ 6, 0x5a, 1, { 83300, 100000, 133300, 100000, 0, 0, 0, 0 } },
};
static int match_cpu(u8 family, u8 model)
{
int i;
for (i = 0; i < ARRAY_SIZE(freq_desc_tables); i++) {
if ((family == freq_desc_tables[i].x86_family) &&
(model == freq_desc_tables[i].x86_model))
return i;
}
return -1;
}
/* Map CPU reference clock freq ID(0-7) to CPU reference clock freq(KHz) */
#define id_to_freq(cpu_index, freq_id) \
(freq_desc_tables[cpu_index].freqs[freq_id])
/*
* MSR-based CPU/TSC frequency discovery for certain CPUs.
*
* Set global "lapic_timer_frequency" to bus_clock_cycles/jiffy
* Return processor base frequency in KHz, or 0 on failure.
*/
unsigned long try_msr_calibrate_tsc(void)
{
u32 lo, hi, ratio, freq_id, freq;
unsigned long res;
int cpu_index;
if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
return 0;
cpu_index = match_cpu(boot_cpu_data.x86, boot_cpu_data.x86_model);
if (cpu_index < 0)
return 0;
if (freq_desc_tables[cpu_index].msr_plat) {
rdmsr(MSR_PLATFORM_INFO, lo, hi);
ratio = (lo >> 8) & 0xff;
} else {
rdmsr(MSR_IA32_PERF_STATUS, lo, hi);
ratio = (hi >> 8) & 0x1f;
}
/* Get FSB FREQ ID */
rdmsr(MSR_FSB_FREQ, lo, hi);
freq_id = lo & 0x7;
freq = id_to_freq(cpu_index, freq_id);
/* TSC frequency = maximum resolved freq * maximum resolved bus ratio */
res = freq * ratio;
#ifdef CONFIG_X86_LOCAL_APIC
lapic_timer_frequency = (freq * 1000) / HZ;
#endif
return res;
}