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
|
/*
* Copyright (c) 2012 The Chromium OS Authors.
*
* TSC calibration codes are adapted from Linux kernel
* arch/x86/kernel/tsc_msr.c and arch/x86/kernel/tsc.c
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <malloc.h>
#include <asm/io.h>
#include <asm/i8254.h>
#include <asm/ibmpc.h>
#include <asm/msr.h>
#include <asm/u-boot-x86.h>
/* CPU reference clock frequency: in KHz */
#define FREQ_83 83200
#define FREQ_100 99840
#define FREQ_133 133200
#define FREQ_166 166400
#define MAX_NUM_FREQS 8
DECLARE_GLOBAL_DATA_PTR;
/*
* According to Intel 64 and IA-32 System Programming Guide,
* if MSR_PERF_STAT[31] is set, the maximum resolved bus ratio can be
* read in MSR_PLATFORM_ID[12:8], otherwise in MSR_PERF_STAT[44:40].
* Unfortunately some Intel Atom SoCs aren't quite compliant to this,
* so we need manually differentiate SoC families. This is what the
* field msr_plat does.
*/
struct freq_desc {
u8 x86_family; /* CPU family */
u8 x86_model; /* model */
u8 msr_plat; /* 1: use MSR_PLATFORM_INFO, 0: MSR_IA32_PERF_STATUS */
u32 freqs[MAX_NUM_FREQS];
};
static struct freq_desc freq_desc_tables[] = {
/* PNW */
{ 6, 0x27, 0, { 0, 0, 0, 0, 0, FREQ_100, 0, FREQ_83 } },
/* CLV+ */
{ 6, 0x35, 0, { 0, FREQ_133, 0, 0, 0, FREQ_100, 0, FREQ_83 } },
/* TNG */
{ 6, 0x4a, 1, { 0, FREQ_100, FREQ_133, 0, 0, 0, 0, 0 } },
/* VLV2 */
{ 6, 0x37, 1, { FREQ_83, FREQ_100, FREQ_133, FREQ_166, 0, 0, 0, 0 } },
/* ANN */
{ 6, 0x5a, 1, { FREQ_83, FREQ_100, FREQ_133, FREQ_100, 0, 0, 0, 0 } },
};
static int match_cpu(u8 family, u8 model)
{
int i;
for (i = 0; i < ARRAY_SIZE(freq_desc_tables); i++) {
if ((family == freq_desc_tables[i].x86_family) &&
(model == freq_desc_tables[i].x86_model))
return i;
}
return -1;
}
/* Map CPU reference clock freq ID(0-7) to CPU reference clock freq(KHz) */
#define id_to_freq(cpu_index, freq_id) \
(freq_desc_tables[cpu_index].freqs[freq_id])
/*
* Do MSR calibration only for known/supported CPUs.
*
* Returns the calibration value or 0 if MSR calibration failed.
*/
static unsigned long try_msr_calibrate_tsc(void)
{
u32 lo, hi, ratio, freq_id, freq;
unsigned long res;
int cpu_index;
cpu_index = match_cpu(gd->arch.x86, gd->arch.x86_model);
if (cpu_index < 0)
return 0;
if (freq_desc_tables[cpu_index].msr_plat) {
rdmsr(MSR_PLATFORM_INFO, lo, hi);
ratio = (lo >> 8) & 0x1f;
} else {
rdmsr(MSR_IA32_PERF_STATUS, lo, hi);
ratio = (hi >> 8) & 0x1f;
}
debug("Maximum core-clock to bus-clock ratio: 0x%x\n", ratio);
if (!ratio)
goto fail;
/* Get FSB FREQ ID */
rdmsr(MSR_FSB_FREQ, lo, hi);
freq_id = lo & 0x7;
freq = id_to_freq(cpu_index, freq_id);
debug("Resolved frequency ID: %u, frequency: %u KHz\n", freq_id, freq);
if (!freq)
goto fail;
/* TSC frequency = maximum resolved freq * maximum resolved bus ratio */
res = freq * ratio / 1000;
debug("TSC runs at %lu MHz\n", res);
return res;
fail:
debug("Fast TSC calibration using MSR failed\n");
return 0;
}
void timer_set_base(u64 base)
{
gd->arch.tsc_base = base;
}
/*
* Get the number of CPU time counter ticks since it was read first time after
* restart. This yields a free running counter guaranteed to take almost 6
* years to wrap around even at 100GHz clock rate.
*/
u64 __attribute__((no_instrument_function)) get_ticks(void)
{
u64 now_tick = rdtsc();
/* We assume that 0 means the base hasn't been set yet */
if (!gd->arch.tsc_base)
panic("No tick base available");
return now_tick - gd->arch.tsc_base;
}
/* Get the speed of the TSC timer in MHz */
unsigned __attribute__((no_instrument_function)) long get_tbclk_mhz(void)
{
unsigned long fast_calibrate;
fast_calibrate = try_msr_calibrate_tsc();
if (!fast_calibrate)
panic("TSC frequency is ZERO");
return fast_calibrate;
}
unsigned long get_tbclk(void)
{
return get_tbclk_mhz() * 1000 * 1000;
}
static ulong get_ms_timer(void)
{
return (get_ticks() * 1000) / get_tbclk();
}
ulong get_timer(ulong base)
{
return get_ms_timer() - base;
}
ulong __attribute__((no_instrument_function)) timer_get_us(void)
{
return get_ticks() / get_tbclk_mhz();
}
ulong timer_get_boot_us(void)
{
return timer_get_us();
}
void __udelay(unsigned long usec)
{
u64 now = get_ticks();
u64 stop;
stop = now + usec * get_tbclk_mhz();
while ((int64_t)(stop - get_ticks()) > 0)
;
}
int timer_init(void)
{
#ifdef CONFIG_SYS_PCAT_TIMER
/* Set up the PCAT timer if required */
pcat_timer_init();
#endif
return 0;
}
|
