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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2014 Google Inc.
* Copyright (C) 2015 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/io.h>
#include <console/console.h>
#include <cpu/x86/msr.h>
#include <delay.h>
#include <intelblocks/fast_spi.h>
#include <reset.h>
#include <soc/bootblock.h>
#include <soc/cpu.h>
#include <soc/iomap.h>
#include <soc/msr.h>
#include <soc/pci_devs.h>
#include <stdint.h>
/* Soft Reset Data Register Bit 12 = MAX Boot Frequency */
#define SPI_STRAP_MAX_FREQ (1<<12)
/* Soft Reset Data Register Bit 6-11 = Flex Ratio */
#define FLEX_RATIO_BIT 6
static void set_pch_cpu_strap(u8 flex_ratio)
{
u32 soft_reset_data;
/* Soft Reset Data Register Bit 12 = MAX Boot Frequency
* Bit 6-11 = Flex Ratio
* Soft Reset Data register located at SPIBAR0 offset 0xF8[0:15].
*/
soft_reset_data = SPI_STRAP_MAX_FREQ;
soft_reset_data |= (flex_ratio << FLEX_RATIO_BIT);
fast_spi_set_strap_msg_data(soft_reset_data);
}
static void set_flex_ratio_to_tdp_nominal(void)
{
msr_t flex_ratio, msr;
u8 nominal_ratio;
/* Check for Flex Ratio support */
flex_ratio = rdmsr(MSR_FLEX_RATIO);
if (!(flex_ratio.lo & FLEX_RATIO_EN))
return;
/* Check for >0 configurable TDPs */
msr = rdmsr(MSR_PLATFORM_INFO);
if (((msr.hi >> 1) & 3) == 0)
return;
/* Use nominal TDP ratio for flex ratio */
msr = rdmsr(MSR_CONFIG_TDP_NOMINAL);
nominal_ratio = msr.lo & 0xff;
/* See if flex ratio is already set to nominal TDP ratio */
if (((flex_ratio.lo >> 8) & 0xff) == nominal_ratio)
return;
/* Set flex ratio to nominal TDP ratio */
flex_ratio.lo &= ~0xff00;
flex_ratio.lo |= nominal_ratio << 8;
flex_ratio.lo |= FLEX_RATIO_LOCK;
wrmsr(MSR_FLEX_RATIO, flex_ratio);
/* Set PCH Soft Reset Data Register with new Flex Ratio */
set_pch_cpu_strap(nominal_ratio);
/* Delay before reset to avoid potential TPM lockout */
mdelay(30);
/* Issue soft reset, will be "CPU only" due to soft reset data */
soft_reset();
}
void bootblock_cpu_init(void)
{
fast_spi_cache_bios_region();
/* Set flex ratio and reset if needed */
set_flex_ratio_to_tdp_nominal();
}
void set_max_freq(void)
{
msr_t msr, perf_ctl, platform_info;
/* Check for configurable TDP option */
platform_info = rdmsr(MSR_PLATFORM_INFO);
if ((platform_info.hi >> 1) & 3) {
/* Set to nominal TDP ratio */
msr = rdmsr(MSR_CONFIG_TDP_NOMINAL);
perf_ctl.lo = (msr.lo & 0xff) << 8;
} else {
/* Platform Info bits 15:8 give max ratio */
msr = rdmsr(MSR_PLATFORM_INFO);
perf_ctl.lo = msr.lo & 0xff00;
}
perf_ctl.hi = 0;
wrmsr(MSR_IA32_PERF_CTL, perf_ctl);
printk(BIOS_DEBUG, "CPU: frequency set to %d MHz\n",
((perf_ctl.lo >> 8) & 0xff) * CONFIG_CPU_BCLK_MHZ);
}
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