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x86, intel-mid: Add Merrifield platform support

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This code was partially based on Mark Brown's previous work.

Signed-off-by: David Cohen <david.a.cohen@linux.intel.com>
Link: http://lkml.kernel.org/r/1387224459-25746-4-git-send-email-david.a.cohen@linux.intel.com
Signed-off-by: Fei Yang <fei.yang@intel.com>
Cc: Mark F. Brown <mark.f.brown@intel.com>
Cc: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
David Cohen
2013-12-16 12:07:38 -08:00
committed by H. Peter Anvin
parent 85611e3feb
commit bc20aa48bb
7 changed files with 144 additions and 8 deletions
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103
arch/x86/platform/intel-mid/mrfl.c Normal file
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/*
* mrfl.c: Intel Merrifield platform specific 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 "intel_mid_weak_decls.h"
static unsigned long __init tangier_calibrate_tsc(void)
{
unsigned long fast_calibrate;
u32 lo, hi, ratio, fsb, bus_freq;
/* *********************** */
/* Compute TSC:Ratio * FSB */
/* *********************** */
/* Compute Ratio */
rdmsr(MSR_PLATFORM_INFO, lo, hi);
pr_debug("IA32 PLATFORM_INFO is 0x%x : %x\n", hi, lo);
ratio = (lo >> 8) & 0xFF;
pr_debug("ratio is %d\n", ratio);
if (!ratio) {
pr_err("Read a zero ratio, force tsc ratio to 4 ...\n");
ratio = 4;
}
/* Compute FSB */
rdmsr(MSR_FSB_FREQ, lo, hi);
pr_debug("Actual FSB frequency detected by SOC 0x%x : %x\n",
hi, lo);
bus_freq = lo & 0x7;
pr_debug("bus_freq = 0x%x\n", bus_freq);
if (bus_freq == 0)
fsb = FSB_FREQ_100SKU;
else if (bus_freq == 1)
fsb = FSB_FREQ_100SKU;
else if (bus_freq == 2)
fsb = FSB_FREQ_133SKU;
else if (bus_freq == 3)
fsb = FSB_FREQ_167SKU;
else if (bus_freq == 4)
fsb = FSB_FREQ_83SKU;
else if (bus_freq == 5)
fsb = FSB_FREQ_400SKU;
else if (bus_freq == 6)
fsb = FSB_FREQ_267SKU;
else if (bus_freq == 7)
fsb = FSB_FREQ_333SKU;
else {
BUG();
pr_err("Invalid bus_freq! Setting to minimal value!\n");
fsb = FSB_FREQ_100SKU;
}
/* TSC = FSB Freq * Resolved HFM Ratio */
fast_calibrate = ratio * fsb;
pr_debug("calculate tangier tsc %lu KHz\n", fast_calibrate);
/* ************************************ */
/* Calculate Local APIC Timer Frequency */
/* ************************************ */
lapic_timer_frequency = (fsb * 1000) / HZ;
pr_debug("Setting lapic_timer_frequency = %d\n",
lapic_timer_frequency);
/* 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 tangier_arch_setup(void)
{
x86_platform.calibrate_tsc = tangier_calibrate_tsc;
}
/* tangier arch ops */
static struct intel_mid_ops tangier_ops = {
.arch_setup = tangier_arch_setup,
};
void * __cpuinit get_tangier_ops()
{
return &tangier_ops;
}