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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <stdint.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/tsc.h>
#include <soc/msr.h>
unsigned int bus_freq_khz(void)
{
msr_t clk_info = rdmsr(MSR_BSEL_CR_OVERCLOCK_CONTROL);
switch (clk_info.lo & 0x3) {
case 0:
return 83333;
case 1:
return 100000;
case 2:
return 133333;
case 3:
return 116666;
default:
return 0;
}
}
unsigned long tsc_freq_mhz(void)
{
msr_t platform_info;
unsigned int bclk_khz = bus_freq_khz();
if (!bclk_khz)
return 0;
platform_info = rdmsr(MSR_PLATFORM_INFO);
return (bclk_khz * ((platform_info.lo >> 8) & 0xff)) / 1000;
}
void set_max_freq(void)
{
msr_t perf_ctl;
msr_t msr;
/* Enable speed step. */
msr = rdmsr(IA32_MISC_ENABLE);
msr.lo |= (1 << 16);
wrmsr(IA32_MISC_ENABLE, msr);
/* Set guaranteed ratio [21:16] from IACORE_RATIOS to bits [15:8] of
* the PERF_CTL. */
msr = rdmsr(MSR_IACORE_RATIOS);
perf_ctl.lo = (msr.lo & 0x3f0000) >> 8;
/* Set guaranteed vid [21:16] from IACORE_VIDS to bits [7:0] of
* the PERF_CTL. */
msr = rdmsr(MSR_IACORE_VIDS);
perf_ctl.lo |= (msr.lo & 0x7f0000) >> 16;
perf_ctl.hi = 0;
wrmsr(IA32_PERF_CTL, perf_ctl);
}
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