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
|
/*
* Copyright (C) 2013 Altera Corporation
* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
*
* Based on cpuinfo.c from microblaze
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/seq_file.h>
#include <linux/string.h>
#include <linux/of.h>
#include <asm/cpuinfo.h>
struct cpuinfo cpuinfo;
#define err_cpu(x) \
pr_err("ERROR: Nios II " x " different for kernel and DTS\n")
static inline u32 fcpu(struct device_node *cpu, const char *n)
{
u32 val = 0;
of_property_read_u32(cpu, n, &val);
return val;
}
static inline u32 fcpu_has(struct device_node *cpu, const char *n)
{
return of_get_property(cpu, n, NULL) ? 1 : 0;
}
void __init setup_cpuinfo(void)
{
struct device_node *cpu;
const char *str;
int len;
cpu = of_find_node_by_type(NULL, "cpu");
if (!cpu)
panic("%s: No CPU found in devicetree!\n", __func__);
if (!fcpu_has(cpu, "altr,has-initda"))
panic("initda instruction is unimplemented. Please update your "
"hardware system to have more than 4-byte line data "
"cache\n");
cpuinfo.cpu_clock_freq = fcpu(cpu, "clock-frequency");
str = of_get_property(cpu, "altr,implementation", &len);
if (str)
strlcpy(cpuinfo.cpu_impl, str, sizeof(cpuinfo.cpu_impl));
else
strcpy(cpuinfo.cpu_impl, "<unknown>");
cpuinfo.has_div = fcpu_has(cpu, "altr,has-div");
cpuinfo.has_mul = fcpu_has(cpu, "altr,has-mul");
cpuinfo.has_mulx = fcpu_has(cpu, "altr,has-mulx");
#ifdef CONFIG_NIOS2_HW_DIV_SUPPORT
if (!cpuinfo.has_div)
err_cpu("DIV");
#endif
#ifdef CONFIG_NIOS2_HW_MUL_SUPPORT
if (!cpuinfo.has_mul)
err_cpu("MUL");
#endif
#ifdef CONFIG_NIOS2_HW_MULX_SUPPORT
if (!cpuinfo.has_mulx)
err_cpu("MULX");
#endif
cpuinfo.tlb_num_ways = fcpu(cpu, "altr,tlb-num-ways");
if (!cpuinfo.tlb_num_ways)
panic("altr,tlb-num-ways can't be 0. Please check your hardware "
"system\n");
cpuinfo.icache_line_size = fcpu(cpu, "icache-line-size");
cpuinfo.icache_size = fcpu(cpu, "icache-size");
if (CONFIG_NIOS2_ICACHE_SIZE != cpuinfo.icache_size)
pr_warn("Warning: icache size configuration mismatch "
"(0x%x vs 0x%x) of CONFIG_NIOS2_ICACHE_SIZE vs "
"device tree icache-size\n",
CONFIG_NIOS2_ICACHE_SIZE, cpuinfo.icache_size);
cpuinfo.dcache_line_size = fcpu(cpu, "dcache-line-size");
if (CONFIG_NIOS2_DCACHE_LINE_SIZE != cpuinfo.dcache_line_size)
pr_warn("Warning: dcache line size configuration mismatch "
"(0x%x vs 0x%x) of CONFIG_NIOS2_DCACHE_LINE_SIZE vs "
"device tree dcache-line-size\n",
CONFIG_NIOS2_DCACHE_LINE_SIZE, cpuinfo.dcache_line_size);
cpuinfo.dcache_size = fcpu(cpu, "dcache-size");
if (CONFIG_NIOS2_DCACHE_SIZE != cpuinfo.dcache_size)
pr_warn("Warning: dcache size configuration mismatch "
"(0x%x vs 0x%x) of CONFIG_NIOS2_DCACHE_SIZE vs "
"device tree dcache-size\n",
CONFIG_NIOS2_DCACHE_SIZE, cpuinfo.dcache_size);
cpuinfo.tlb_pid_num_bits = fcpu(cpu, "altr,pid-num-bits");
cpuinfo.tlb_num_ways_log2 = ilog2(cpuinfo.tlb_num_ways);
cpuinfo.tlb_num_entries = fcpu(cpu, "altr,tlb-num-entries");
cpuinfo.tlb_num_lines = cpuinfo.tlb_num_entries / cpuinfo.tlb_num_ways;
cpuinfo.tlb_ptr_sz = fcpu(cpu, "altr,tlb-ptr-sz");
cpuinfo.reset_addr = fcpu(cpu, "altr,reset-addr");
cpuinfo.exception_addr = fcpu(cpu, "altr,exception-addr");
cpuinfo.fast_tlb_miss_exc_addr = fcpu(cpu, "altr,fast-tlb-miss-addr");
}
#ifdef CONFIG_PROC_FS
/*
* Get CPU information for use by the procfs.
*/
static int show_cpuinfo(struct seq_file *m, void *v)
{
int count = 0;
const u32 clockfreq = cpuinfo.cpu_clock_freq;
count = seq_printf(m,
"CPU:\t\tNios II/%s\n"
"MMU:\t\t%s\n"
"FPU:\t\tnone\n"
"Clocking:\t%u.%02u MHz\n"
"BogoMips:\t%lu.%02lu\n"
"Calibration:\t%lu loops\n",
cpuinfo.cpu_impl,
cpuinfo.mmu ? "present" : "none",
clockfreq / 1000000, (clockfreq / 100000) % 10,
(loops_per_jiffy * HZ) / 500000,
((loops_per_jiffy * HZ) / 5000) % 100,
(loops_per_jiffy * HZ));
count += seq_printf(m,
"HW:\n"
" MUL:\t\t%s\n"
" MULX:\t\t%s\n"
" DIV:\t\t%s\n",
cpuinfo.has_mul ? "yes" : "no",
cpuinfo.has_mulx ? "yes" : "no",
cpuinfo.has_div ? "yes" : "no");
count += seq_printf(m,
"Icache:\t\t%ukB, line length: %u\n",
cpuinfo.icache_size >> 10,
cpuinfo.icache_line_size);
count += seq_printf(m,
"Dcache:\t\t%ukB, line length: %u\n",
cpuinfo.dcache_size >> 10,
cpuinfo.dcache_line_size);
count += seq_printf(m,
"TLB:\t\t%u ways, %u entries, %u PID bits\n",
cpuinfo.tlb_num_ways,
cpuinfo.tlb_num_entries,
cpuinfo.tlb_pid_num_bits);
return 0;
}
static void *cpuinfo_start(struct seq_file *m, loff_t *pos)
{
unsigned long i = *pos;
return i < num_possible_cpus() ? (void *) (i + 1) : NULL;
}
static void *cpuinfo_next(struct seq_file *m, void *v, loff_t *pos)
{
++*pos;
return cpuinfo_start(m, pos);
}
static void cpuinfo_stop(struct seq_file *m, void *v)
{
}
const struct seq_operations cpuinfo_op = {
.start = cpuinfo_start,
.next = cpuinfo_next,
.stop = cpuinfo_stop,
.show = show_cpuinfo
};
#endif /* CONFIG_PROC_FS */
|
