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
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
*
* 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, either version 2 of the License, or
* (at your option) any later version.
*
* 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 "update_ucode.h"
#include <console/console.h>
#include <device/device.h>
#include <cpu/cpu.h>
#include <cpu/x86/mtrr.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/lapic.h>
#include <cpu/x86/cache.h>
#include <delay.h>
#define MODEL_NANO 0x2
#define MODEL_NANO_3000_B0 0x8
#define MODEL_NANO_3000_B2 0xa
#define MSR_IA32_PERF_STATUS 0x00000198
#define MSR_IA32_PERF_CTL 0x00000199
#define MSR_IA32_MISC_ENABLE 0x000001a0
#define NANO_MYSTERIOUS_MSR 0x120e
static void nano_finish_fid_vid_transition(void)
{
msr_t msr;
/* Wait until the power transition ends */
int cnt = 0;
do {
udelay(16);
msr = rdmsr(MSR_IA32_PERF_STATUS);
cnt++;
if (cnt > 128) {
printk(BIOS_WARNING,
"Error while updating multiplier and voltage\n");
break;
}
} while (msr.lo & ((1 << 16) | (1 << 17)));
/* Print the new FID and Voltage */
u8 cur_vid = (msr.lo >> 0) & 0xff;
u8 cur_fid = (msr.lo >> 8) & 0xff;
printk(BIOS_INFO, "New CPU multiplier: %dx\n", cur_fid);
printk(BIOS_INFO, "New Voltage ID : %dx\n", cur_vid);
}
static void nano_set_max_fid_vid(void)
{
msr_t msr;
/* Get voltage and frequency info */
msr = rdmsr(MSR_IA32_PERF_STATUS);
u8 min_fid = (msr.hi >> 24);
u8 max_fid = (msr.hi >> 8) & 0xff;
u8 min_vid = (msr.hi >> 16) & 0xff;
u8 max_vid = (msr.hi >> 0) & 0xff;
u8 cur_vid = (msr.lo >> 0) & 0xff;
u8 cur_fid = (msr.lo >> 8) & 0xff;
printk(BIOS_INFO, "CPU multiplier: %dx (min %dx; max %dx)\n",
cur_fid, min_fid, max_fid);
printk(BIOS_INFO, "Voltage ID : %dx (min %dx; max %dx)\n",
cur_vid, min_vid, max_vid);
if ( (cur_fid != max_fid) || (cur_vid != max_vid) ) {
/* Set highest frequency and VID */
msr.lo = msr.hi;
msr.hi = 0;
wrmsr(MSR_IA32_PERF_CTL, msr);
/* Wait for the transition to complete, otherwise, the CPU
* might reset itself repeatedly */
nano_finish_fid_vid_transition();
}
/* As a side note, if we didn't update the microcode by this point, the
* second PLL will not lock correctly. The clock will still be provided
* by the first PLL, and execution will continue normally, ___until___
* the CPU switches PLL. Once that happens we will no longer have a
* working clock source, and the CPU will hang
* Moral of the story: update the microcode, or don't change FID
* This check is handled before calling nano_power() */
}
static void nano_power(void)
{
msr_t msr;
/* Enable Powersaver */
msr = rdmsr(MSR_IA32_MISC_ENABLE);
msr.lo |= (1 << 16);
wrmsr(MSR_IA32_MISC_ENABLE, msr);
/* Enable 6 bit or 7-bit VRM support
* This MSR is not documented by VIA docs, other than setting these
* bits */
msr = rdmsr(NANO_MYSTERIOUS_MSR);
msr.lo |= ( (1 << 7) | (1 << 4) );
/* FIXME: Do we have a 6-bit or 7-bit VRM?
* set bit [5] for 7-bit, or don't set it for 6 bit VRM
* This will probably require a Kconfig option
* My board has a 7-bit VRM, so I can't test the 6-bit VRM stuff */
msr.lo |= (1 << 5);
wrmsr(NANO_MYSTERIOUS_MSR, msr);
/* Set the maximum frequency and voltage */
nano_set_max_fid_vid();
/* Enable TM3 */
msr = rdmsr(MSR_IA32_MISC_ENABLE);
msr.lo |= ( (1 << 3) | (1 << 13) );
wrmsr(MSR_IA32_MISC_ENABLE, msr);
u8 stepping = ( cpuid_eax(0x1) ) &0xf;
if (stepping >= MODEL_NANO_3000_B0) {
/* Hello Nano 3000. The Terminator needs a CPU upgrade */
/* Enable C1e, C2e, C3e, and C4e states */
msr = rdmsr(MSR_IA32_MISC_ENABLE);
msr.lo |= ( (1 << 25) | (1 << 26) | (1 << 31)); /* C1e, C2e, C3e */
msr.hi |= (1 << 0); /* C4e */
wrmsr(MSR_IA32_MISC_ENABLE, msr);
}
/* Lock on Powersaver */
msr = rdmsr(MSR_IA32_MISC_ENABLE);
msr.lo |= (1 << 20);
wrmsr(MSR_IA32_MISC_ENABLE, msr);
}
static void nano_init(struct device *dev)
{
struct cpuinfo_x86 c;
get_fms(&c, dev->device);
/* We didn't test this on the Nano 1000/2000 series, so warn the user */
if (c.x86_mask < MODEL_NANO_3000_B0) {
printk(BIOS_EMERG, "WARNING: This CPU has not been tested. "
"Please report any issues encountered.\n");
}
switch (c.x86_mask) {
case MODEL_NANO:
printk(BIOS_INFO, "VIA Nano");
break;
case MODEL_NANO_3000_B0:
printk(BIOS_INFO, "VIA Nano 3000 rev B0");
break;
case MODEL_NANO_3000_B2:
printk(BIOS_INFO, "VIA Nano 3000 rev B2");
break;
default:
printk(BIOS_EMERG, "Stepping not recognized: %x\n", c.x86_mask);
}
printk(BIOS_INFO, "\n");
/* We only read microcode from CBFS. If we don't have any microcode in
* CBFS, we'll just get back with 0 updates. User choice FTW. */
unsigned int n_updates = nano_update_ucode();
if (n_updates != 0){
nano_power();
} else {
/* Changing the frequency or voltage without first updating the
* microcode will hang the CPU, so just don't do it */
printk(BIOS_EMERG, "WARNING: CPU Microcode not updated.\n"
" Will not change frequency, as this may hang the CPU.\n");
}
/* Turn on cache */
x86_enable_cache();
/* Set up Memory Type Range Registers */
x86_setup_mtrrs();
x86_mtrr_check();
/* Enable the local CPU APICs */
setup_lapic();
}
static struct device_operations cpu_dev_ops = {
.init = nano_init,
};
static struct cpu_device_id cpu_table[] = {
{X86_VENDOR_CENTAUR, 0x06f2}, // VIA NANO 1000/2000 Series
{X86_VENDOR_CENTAUR, 0x06f8}, // VIA NANO 3000 rev B0
{X86_VENDOR_CENTAUR, 0x06fa}, // VIA NANO 3000 rev B2
{0, 0},
};
static const struct cpu_driver driver __cpu_driver = {
.ops = &cpu_dev_ops,
.id_table = cpu_table,
};
|
