summaryrefslogtreecommitdiff
path: root/src/cpu/intel/model_206ax/bootblock.c
blob: a504480bcafe90e51bc846e211f0958ded3c0a4a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
/*
 * This file is part of the coreboot project.
 *
 * 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 <stdint.h>
#include <arch/bootblock.h>
#include <arch/cpu.h>
#include <cpu/x86/msr.h>
#include <arch/io.h>
#include <halt.h>

#include "model_206ax.h"

#if CONFIG(SOUTHBRIDGE_INTEL_BD82X6X) || \
	CONFIG(SOUTHBRIDGE_INTEL_C216)
/* Needed for RCBA access to set Soft Reset Data register */
#include <southbridge/intel/bd82x6x/pch.h>
#else
#error "CPU must be paired with Intel BD82X6X or C216 southbridge"
#endif

static void set_flex_ratio_to_tdp_nominal(void)
{
	msr_t flex_ratio, msr;
	u32 soft_reset;
	u8 nominal_ratio;

	/* Minimum CPU revision for configurable TDP support */
	if (cpuid_eax(1) < IVB_CONFIG_TDP_MIN_CPUID)
		return;

	/* 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);

	/* Issue warm reset, will be "CPU only" due to soft reset data */
	outb(0x0, 0xcf9);
	outb(0x6, 0xcf9);
	halt();
}

void bootblock_early_cpu_init(void)
{
	/* Set flex ratio and reset if needed */
	set_flex_ratio_to_tdp_nominal();
}