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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 | ||
2612b879 LFT |
44 | void __init setup_cpuinfo(void) |
45 | { | |
46 | struct device_node *cpu; | |
47 | const char *str; | |
48 | int len; | |
49 | ||
50 | cpu = of_find_node_by_type(NULL, "cpu"); | |
51 | if (!cpu) | |
52 | panic("%s: No CPU found in devicetree!\n", __func__); | |
53 | ||
65f836ae | 54 | if (!of_property_read_bool(cpu, "altr,has-initda")) |
2612b879 LFT |
55 | panic("initda instruction is unimplemented. Please update your " |
56 | "hardware system to have more than 4-byte line data " | |
57 | "cache\n"); | |
58 | ||
59 | cpuinfo.cpu_clock_freq = fcpu(cpu, "clock-frequency"); | |
60 | ||
61 | str = of_get_property(cpu, "altr,implementation", &len); | |
62 | if (str) | |
63 | strlcpy(cpuinfo.cpu_impl, str, sizeof(cpuinfo.cpu_impl)); | |
64 | else | |
65 | strcpy(cpuinfo.cpu_impl, "<unknown>"); | |
66 | ||
65f836ae LFT |
67 | cpuinfo.has_div = of_property_read_bool(cpu, "altr,has-div"); |
68 | cpuinfo.has_mul = of_property_read_bool(cpu, "altr,has-mul"); | |
69 | cpuinfo.has_mulx = of_property_read_bool(cpu, "altr,has-mulx"); | |
70 | cpuinfo.mmu = of_property_read_bool(cpu, "altr,has-mmu"); | |
2612b879 | 71 | |
ac8ab8dd | 72 | if (IS_ENABLED(CONFIG_NIOS2_HW_DIV_SUPPORT) && !cpuinfo.has_div) |
2612b879 | 73 | err_cpu("DIV"); |
ac8ab8dd TK |
74 | |
75 | if (IS_ENABLED(CONFIG_NIOS2_HW_MUL_SUPPORT) && !cpuinfo.has_mul) | |
2612b879 | 76 | err_cpu("MUL"); |
ac8ab8dd TK |
77 | |
78 | if (IS_ENABLED(CONFIG_NIOS2_HW_MULX_SUPPORT) && !cpuinfo.has_mulx) | |
2612b879 | 79 | err_cpu("MULX"); |
2612b879 LFT |
80 | |
81 | cpuinfo.tlb_num_ways = fcpu(cpu, "altr,tlb-num-ways"); | |
82 | if (!cpuinfo.tlb_num_ways) | |
83 | panic("altr,tlb-num-ways can't be 0. Please check your hardware " | |
84 | "system\n"); | |
85 | cpuinfo.icache_line_size = fcpu(cpu, "icache-line-size"); | |
86 | cpuinfo.icache_size = fcpu(cpu, "icache-size"); | |
87 | if (CONFIG_NIOS2_ICACHE_SIZE != cpuinfo.icache_size) | |
88 | pr_warn("Warning: icache size configuration mismatch " | |
89 | "(0x%x vs 0x%x) of CONFIG_NIOS2_ICACHE_SIZE vs " | |
90 | "device tree icache-size\n", | |
91 | CONFIG_NIOS2_ICACHE_SIZE, cpuinfo.icache_size); | |
92 | ||
93 | cpuinfo.dcache_line_size = fcpu(cpu, "dcache-line-size"); | |
94 | if (CONFIG_NIOS2_DCACHE_LINE_SIZE != cpuinfo.dcache_line_size) | |
95 | pr_warn("Warning: dcache line size configuration mismatch " | |
96 | "(0x%x vs 0x%x) of CONFIG_NIOS2_DCACHE_LINE_SIZE vs " | |
97 | "device tree dcache-line-size\n", | |
98 | CONFIG_NIOS2_DCACHE_LINE_SIZE, cpuinfo.dcache_line_size); | |
99 | cpuinfo.dcache_size = fcpu(cpu, "dcache-size"); | |
100 | if (CONFIG_NIOS2_DCACHE_SIZE != cpuinfo.dcache_size) | |
101 | pr_warn("Warning: dcache size configuration mismatch " | |
102 | "(0x%x vs 0x%x) of CONFIG_NIOS2_DCACHE_SIZE vs " | |
103 | "device tree dcache-size\n", | |
104 | CONFIG_NIOS2_DCACHE_SIZE, cpuinfo.dcache_size); | |
105 | ||
106 | cpuinfo.tlb_pid_num_bits = fcpu(cpu, "altr,pid-num-bits"); | |
107 | cpuinfo.tlb_num_ways_log2 = ilog2(cpuinfo.tlb_num_ways); | |
108 | cpuinfo.tlb_num_entries = fcpu(cpu, "altr,tlb-num-entries"); | |
109 | cpuinfo.tlb_num_lines = cpuinfo.tlb_num_entries / cpuinfo.tlb_num_ways; | |
110 | cpuinfo.tlb_ptr_sz = fcpu(cpu, "altr,tlb-ptr-sz"); | |
111 | ||
112 | cpuinfo.reset_addr = fcpu(cpu, "altr,reset-addr"); | |
113 | cpuinfo.exception_addr = fcpu(cpu, "altr,exception-addr"); | |
114 | cpuinfo.fast_tlb_miss_exc_addr = fcpu(cpu, "altr,fast-tlb-miss-addr"); | |
115 | } | |
116 | ||
117 | #ifdef CONFIG_PROC_FS | |
118 | ||
119 | /* | |
120 | * Get CPU information for use by the procfs. | |
121 | */ | |
122 | static int show_cpuinfo(struct seq_file *m, void *v) | |
123 | { | |
2612b879 LFT |
124 | const u32 clockfreq = cpuinfo.cpu_clock_freq; |
125 | ||
4122669e JP |
126 | seq_printf(m, |
127 | "CPU:\t\tNios II/%s\n" | |
128 | "MMU:\t\t%s\n" | |
129 | "FPU:\t\tnone\n" | |
130 | "Clocking:\t%u.%02u MHz\n" | |
131 | "BogoMips:\t%lu.%02lu\n" | |
132 | "Calibration:\t%lu loops\n", | |
133 | cpuinfo.cpu_impl, | |
134 | cpuinfo.mmu ? "present" : "none", | |
135 | clockfreq / 1000000, (clockfreq / 100000) % 10, | |
136 | (loops_per_jiffy * HZ) / 500000, | |
137 | ((loops_per_jiffy * HZ) / 5000) % 100, | |
138 | (loops_per_jiffy * HZ)); | |
139 | ||
140 | seq_printf(m, | |
141 | "HW:\n" | |
142 | " MUL:\t\t%s\n" | |
143 | " MULX:\t\t%s\n" | |
144 | " DIV:\t\t%s\n", | |
145 | cpuinfo.has_mul ? "yes" : "no", | |
146 | cpuinfo.has_mulx ? "yes" : "no", | |
147 | cpuinfo.has_div ? "yes" : "no"); | |
148 | ||
149 | seq_printf(m, | |
150 | "Icache:\t\t%ukB, line length: %u\n", | |
151 | cpuinfo.icache_size >> 10, | |
152 | cpuinfo.icache_line_size); | |
153 | ||
154 | seq_printf(m, | |
155 | "Dcache:\t\t%ukB, line length: %u\n", | |
156 | cpuinfo.dcache_size >> 10, | |
157 | cpuinfo.dcache_line_size); | |
158 | ||
159 | seq_printf(m, | |
160 | "TLB:\t\t%u ways, %u entries, %u PID bits\n", | |
161 | cpuinfo.tlb_num_ways, | |
162 | cpuinfo.tlb_num_entries, | |
163 | cpuinfo.tlb_pid_num_bits); | |
2612b879 LFT |
164 | |
165 | return 0; | |
166 | } | |
167 | ||
168 | static void *cpuinfo_start(struct seq_file *m, loff_t *pos) | |
169 | { | |
170 | unsigned long i = *pos; | |
171 | ||
172 | return i < num_possible_cpus() ? (void *) (i + 1) : NULL; | |
173 | } | |
174 | ||
175 | static void *cpuinfo_next(struct seq_file *m, void *v, loff_t *pos) | |
176 | { | |
177 | ++*pos; | |
178 | return cpuinfo_start(m, pos); | |
179 | } | |
180 | ||
181 | static void cpuinfo_stop(struct seq_file *m, void *v) | |
182 | { | |
183 | } | |
184 | ||
185 | const struct seq_operations cpuinfo_op = { | |
186 | .start = cpuinfo_start, | |
187 | .next = cpuinfo_next, | |
188 | .stop = cpuinfo_stop, | |
189 | .show = show_cpuinfo | |
190 | }; | |
191 | ||
192 | #endif /* CONFIG_PROC_FS */ |