76 строки
1.6 KiB
C
76 строки
1.6 KiB
C
/*
|
|
* mfld.c: Intel Medfield platform setup code
|
|
*
|
|
* (C) Copyright 2013 Intel Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; version 2
|
|
* of the License.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/apic.h>
|
|
#include <asm/intel-mid.h>
|
|
#include <asm/intel_mid_vrtc.h>
|
|
|
|
#include "intel_mid_weak_decls.h"
|
|
|
|
static void penwell_arch_setup(void);
|
|
/* penwell arch ops */
|
|
static struct intel_mid_ops penwell_ops = {
|
|
.arch_setup = penwell_arch_setup,
|
|
};
|
|
|
|
static void mfld_power_off(void)
|
|
{
|
|
}
|
|
|
|
static unsigned long __init mfld_calibrate_tsc(void)
|
|
{
|
|
unsigned long fast_calibrate;
|
|
u32 lo, hi, ratio, fsb;
|
|
|
|
rdmsr(MSR_IA32_PERF_STATUS, lo, hi);
|
|
pr_debug("IA32 perf status is 0x%x, 0x%0x\n", lo, hi);
|
|
ratio = (hi >> 8) & 0x1f;
|
|
pr_debug("ratio is %d\n", ratio);
|
|
if (!ratio) {
|
|
pr_err("read a zero ratio, should be incorrect!\n");
|
|
pr_err("force tsc ratio to 16 ...\n");
|
|
ratio = 16;
|
|
}
|
|
rdmsr(MSR_FSB_FREQ, lo, hi);
|
|
if ((lo & 0x7) == 0x7)
|
|
fsb = FSB_FREQ_83SKU;
|
|
else
|
|
fsb = FSB_FREQ_100SKU;
|
|
fast_calibrate = ratio * fsb;
|
|
pr_debug("read penwell tsc %lu khz\n", fast_calibrate);
|
|
lapic_timer_frequency = fsb * 1000 / HZ;
|
|
/* mark tsc clocksource as reliable */
|
|
set_cpu_cap(&boot_cpu_data, X86_FEATURE_TSC_RELIABLE);
|
|
|
|
if (fast_calibrate)
|
|
return fast_calibrate;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __init penwell_arch_setup(void)
|
|
{
|
|
x86_platform.calibrate_tsc = mfld_calibrate_tsc;
|
|
pm_power_off = mfld_power_off;
|
|
}
|
|
|
|
void *get_penwell_ops(void)
|
|
{
|
|
return &penwell_ops;
|
|
}
|
|
|
|
void *get_cloverview_ops(void)
|
|
{
|
|
return &penwell_ops;
|
|
}
|