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2612b879 LFT |
1 | /* |
2 | * Copyright (C) 2013 Altera Corporation | |
3 | * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> | |
4 | * | |
5 | * Based on cpuinfo.c from microblaze | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <linux/kernel.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/seq_file.h> | |
26 | #include <linux/string.h> | |
27 | #include <linux/of.h> | |
28 | #include <asm/cpuinfo.h> | |
29 | ||
30 | struct cpuinfo cpuinfo; | |
31 | ||
32 | #define err_cpu(x) \ | |
33 | pr_err("ERROR: Nios II " x " different for kernel and DTS\n") | |
34 | ||
35 | static inline u32 fcpu(struct device_node *cpu, const char *n) | |
36 | { | |
37 | u32 val = 0; | |
38 | ||
39 | of_property_read_u32(cpu, n, &val); | |
40 | ||
41 | return val; | |
42 | } | |
43 | ||
44 | static inline u32 fcpu_has(struct device_node *cpu, const char *n) | |
45 | { | |
46 | return of_get_property(cpu, n, NULL) ? 1 : 0; | |
47 | } | |
48 | ||
49 | void __init setup_cpuinfo(void) | |
50 | { | |
51 | struct device_node *cpu; | |
52 | const char *str; | |
53 | int len; | |
54 | ||
55 | cpu = of_find_node_by_type(NULL, "cpu"); | |
56 | if (!cpu) | |
57 | panic("%s: No CPU found in devicetree!\n", __func__); | |
58 | ||
59 | if (!fcpu_has(cpu, "altr,has-initda")) | |
60 | panic("initda instruction is unimplemented. Please update your " | |
61 | "hardware system to have more than 4-byte line data " | |
62 | "cache\n"); | |
63 | ||
64 | cpuinfo.cpu_clock_freq = fcpu(cpu, "clock-frequency"); | |
65 | ||
66 | str = of_get_property(cpu, "altr,implementation", &len); | |
67 | if (str) | |
68 | strlcpy(cpuinfo.cpu_impl, str, sizeof(cpuinfo.cpu_impl)); | |
69 | else | |
70 | strcpy(cpuinfo.cpu_impl, "<unknown>"); | |
71 | ||
72 | cpuinfo.has_div = fcpu_has(cpu, "altr,has-div"); | |
73 | cpuinfo.has_mul = fcpu_has(cpu, "altr,has-mul"); | |
74 | cpuinfo.has_mulx = fcpu_has(cpu, "altr,has-mulx"); | |
75 | ||
76 | #ifdef CONFIG_NIOS2_HW_DIV_SUPPORT | |
77 | if (!cpuinfo.has_div) | |
78 | err_cpu("DIV"); | |
79 | #endif | |
80 | #ifdef CONFIG_NIOS2_HW_MUL_SUPPORT | |
81 | if (!cpuinfo.has_mul) | |
82 | err_cpu("MUL"); | |
83 | #endif | |
84 | #ifdef CONFIG_NIOS2_HW_MULX_SUPPORT | |
85 | if (!cpuinfo.has_mulx) | |
86 | err_cpu("MULX"); | |
87 | #endif | |
88 | ||
89 | cpuinfo.tlb_num_ways = fcpu(cpu, "altr,tlb-num-ways"); | |
90 | if (!cpuinfo.tlb_num_ways) | |
91 | panic("altr,tlb-num-ways can't be 0. Please check your hardware " | |
92 | "system\n"); | |
93 | cpuinfo.icache_line_size = fcpu(cpu, "icache-line-size"); | |
94 | cpuinfo.icache_size = fcpu(cpu, "icache-size"); | |
95 | if (CONFIG_NIOS2_ICACHE_SIZE != cpuinfo.icache_size) | |
96 | pr_warn("Warning: icache size configuration mismatch " | |
97 | "(0x%x vs 0x%x) of CONFIG_NIOS2_ICACHE_SIZE vs " | |
98 | "device tree icache-size\n", | |
99 | CONFIG_NIOS2_ICACHE_SIZE, cpuinfo.icache_size); | |
100 | ||
101 | cpuinfo.dcache_line_size = fcpu(cpu, "dcache-line-size"); | |
102 | if (CONFIG_NIOS2_DCACHE_LINE_SIZE != cpuinfo.dcache_line_size) | |
103 | pr_warn("Warning: dcache line size configuration mismatch " | |
104 | "(0x%x vs 0x%x) of CONFIG_NIOS2_DCACHE_LINE_SIZE vs " | |
105 | "device tree dcache-line-size\n", | |
106 | CONFIG_NIOS2_DCACHE_LINE_SIZE, cpuinfo.dcache_line_size); | |
107 | cpuinfo.dcache_size = fcpu(cpu, "dcache-size"); | |
108 | if (CONFIG_NIOS2_DCACHE_SIZE != cpuinfo.dcache_size) | |
109 | pr_warn("Warning: dcache size configuration mismatch " | |
110 | "(0x%x vs 0x%x) of CONFIG_NIOS2_DCACHE_SIZE vs " | |
111 | "device tree dcache-size\n", | |
112 | CONFIG_NIOS2_DCACHE_SIZE, cpuinfo.dcache_size); | |
113 | ||
114 | cpuinfo.tlb_pid_num_bits = fcpu(cpu, "altr,pid-num-bits"); | |
115 | cpuinfo.tlb_num_ways_log2 = ilog2(cpuinfo.tlb_num_ways); | |
116 | cpuinfo.tlb_num_entries = fcpu(cpu, "altr,tlb-num-entries"); | |
117 | cpuinfo.tlb_num_lines = cpuinfo.tlb_num_entries / cpuinfo.tlb_num_ways; | |
118 | cpuinfo.tlb_ptr_sz = fcpu(cpu, "altr,tlb-ptr-sz"); | |
119 | ||
120 | cpuinfo.reset_addr = fcpu(cpu, "altr,reset-addr"); | |
121 | cpuinfo.exception_addr = fcpu(cpu, "altr,exception-addr"); | |
122 | cpuinfo.fast_tlb_miss_exc_addr = fcpu(cpu, "altr,fast-tlb-miss-addr"); | |
123 | } | |
124 | ||
125 | #ifdef CONFIG_PROC_FS | |
126 | ||
127 | /* | |
128 | * Get CPU information for use by the procfs. | |
129 | */ | |
130 | static int show_cpuinfo(struct seq_file *m, void *v) | |
131 | { | |
132 | int count = 0; | |
133 | const u32 clockfreq = cpuinfo.cpu_clock_freq; | |
134 | ||
135 | count = seq_printf(m, | |
136 | "CPU:\t\tNios II/%s\n" | |
137 | "MMU:\t\t%s\n" | |
138 | "FPU:\t\tnone\n" | |
139 | "Clocking:\t%u.%02u MHz\n" | |
140 | "BogoMips:\t%lu.%02lu\n" | |
141 | "Calibration:\t%lu loops\n", | |
142 | cpuinfo.cpu_impl, | |
143 | cpuinfo.mmu ? "present" : "none", | |
144 | clockfreq / 1000000, (clockfreq / 100000) % 10, | |
145 | (loops_per_jiffy * HZ) / 500000, | |
146 | ((loops_per_jiffy * HZ) / 5000) % 100, | |
147 | (loops_per_jiffy * HZ)); | |
148 | ||
149 | count += seq_printf(m, | |
150 | "HW:\n" | |
151 | " MUL:\t\t%s\n" | |
152 | " MULX:\t\t%s\n" | |
153 | " DIV:\t\t%s\n", | |
154 | cpuinfo.has_mul ? "yes" : "no", | |
155 | cpuinfo.has_mulx ? "yes" : "no", | |
156 | cpuinfo.has_div ? "yes" : "no"); | |
157 | ||
158 | count += seq_printf(m, | |
159 | "Icache:\t\t%ukB, line length: %u\n", | |
160 | cpuinfo.icache_size >> 10, | |
161 | cpuinfo.icache_line_size); | |
162 | ||
163 | count += seq_printf(m, | |
164 | "Dcache:\t\t%ukB, line length: %u\n", | |
165 | cpuinfo.dcache_size >> 10, | |
166 | cpuinfo.dcache_line_size); | |
167 | ||
168 | count += seq_printf(m, | |
169 | "TLB:\t\t%u ways, %u entries, %u PID bits\n", | |
170 | cpuinfo.tlb_num_ways, | |
171 | cpuinfo.tlb_num_entries, | |
172 | cpuinfo.tlb_pid_num_bits); | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | static void *cpuinfo_start(struct seq_file *m, loff_t *pos) | |
178 | { | |
179 | unsigned long i = *pos; | |
180 | ||
181 | return i < num_possible_cpus() ? (void *) (i + 1) : NULL; | |
182 | } | |
183 | ||
184 | static void *cpuinfo_next(struct seq_file *m, void *v, loff_t *pos) | |
185 | { | |
186 | ++*pos; | |
187 | return cpuinfo_start(m, pos); | |
188 | } | |
189 | ||
190 | static void cpuinfo_stop(struct seq_file *m, void *v) | |
191 | { | |
192 | } | |
193 | ||
194 | const struct seq_operations cpuinfo_op = { | |
195 | .start = cpuinfo_start, | |
196 | .next = cpuinfo_next, | |
197 | .stop = cpuinfo_stop, | |
198 | .show = show_cpuinfo | |
199 | }; | |
200 | ||
201 | #endif /* CONFIG_PROC_FS */ |