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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2014 Google Inc.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc.
*/
#include <stdint.h>
#include <arch/cpu.h>
#include <cpu/x86/cache.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/mtrr.h>
#include <arch/io.h>
#include <halt.h>
#include <cpu/intel/microcode/microcode.c>
#include <soc/rcba.h>
#include <soc/msr.h>
static void set_var_mtrr(
unsigned reg, unsigned base, unsigned size, unsigned type)
{
/* Bit Bit 32-35 of MTRRphysMask should be set to 1 */
msr_t basem, maskm;
basem.lo = base | type;
basem.hi = 0;
wrmsr(MTRRphysBase_MSR(reg), basem);
maskm.lo = ~(size - 1) | MTRRphysMaskValid;
maskm.hi = (1 << (CONFIG_CPU_ADDR_BITS - 32)) - 1;
wrmsr(MTRRphysMask_MSR(reg), maskm);
}
static void enable_rom_caching(void)
{
msr_t msr;
disable_cache();
/* Why only top 4MiB ? */
set_var_mtrr(1, CACHE_ROM_BASE, CACHE_ROM_SIZE, MTRR_TYPE_WRPROT);
enable_cache();
/* Enable Variable MTRRs */
msr.hi = 0x00000000;
msr.lo = 0x00000800;
wrmsr(MTRRdefType_MSR, msr);
}
static void bootblock_mdelay(int ms)
{
u32 target = ms * 24 * 1000;
msr_t current;
msr_t start = rdmsr(MSR_COUNTER_24_MHZ);
do {
current = rdmsr(MSR_COUNTER_24_MHZ);
} while ((current.lo - start.lo) < target);
}
static void set_flex_ratio_to_tdp_nominal(void)
{
msr_t flex_ratio, msr;
u32 soft_reset;
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 flex ratio in soft reset data register bits 11:6.
* RCBA region is enabled in southbridge bootblock */
soft_reset = RCBA32(SOFT_RESET_DATA);
soft_reset &= ~(0x3f << 6);
soft_reset |= (nominal_ratio & 0x3f) << 6;
RCBA32(SOFT_RESET_DATA) = soft_reset;
/* Set soft reset control to use register value */
RCBA32_OR(SOFT_RESET_CTRL, 1);
/* Delay before reset to avoid potential TPM lockout */
bootblock_mdelay(30);
/* Issue warm reset, will be "CPU only" due to soft reset data */
outb(0x0, 0xcf9);
outb(0x6, 0xcf9);
halt();
}
static void check_for_clean_reset(void)
{
msr_t msr;
msr = rdmsr(MTRRdefType_MSR);
/* Use the MTRR default type MSR as a proxy for detecting INIT#.
* Reset the system if any known bits are set in that MSR. That is
* an indication of the CPU not being properly reset. */
if (msr.lo & (MTRRdefTypeEn | MTRRdefTypeFixEn)) {
outb(0x0, 0xcf9);
outb(0x6, 0xcf9);
halt();
}
}
static void bootblock_cpu_init(void)
{
/* Set flex ratio and reset if needed */
set_flex_ratio_to_tdp_nominal();
check_for_clean_reset();
enable_rom_caching();
intel_update_microcode_from_cbfs();
}
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