Ley Foon Tan | 2612b87 | 2014-11-06 15:20:06 +0800 | [diff] [blame] | 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 | |
Ley Foon Tan | 2612b87 | 2014-11-06 15:20:06 +0800 | [diff] [blame] | 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 | |
Ley Foon Tan | 476080a | 2016-08-25 16:11:59 +0800 | [diff] [blame] | 54 | if (!of_property_read_bool(cpu, "altr,has-initda")) |
Ley Foon Tan | 2612b87 | 2014-11-06 15:20:06 +0800 | [diff] [blame] | 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 | |
Ley Foon Tan | 476080a | 2016-08-25 16:11:59 +0800 | [diff] [blame] | 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"); |
Ley Foon Tan | 2612b87 | 2014-11-06 15:20:06 +0800 | [diff] [blame] | 71 | |
Tobias Klauser | ac8ab8d | 2014-11-17 18:30:37 +0800 | [diff] [blame] | 72 | if (IS_ENABLED(CONFIG_NIOS2_HW_DIV_SUPPORT) && !cpuinfo.has_div) |
Ley Foon Tan | 2612b87 | 2014-11-06 15:20:06 +0800 | [diff] [blame] | 73 | err_cpu("DIV"); |
Tobias Klauser | ac8ab8d | 2014-11-17 18:30:37 +0800 | [diff] [blame] | 74 | |
| 75 | if (IS_ENABLED(CONFIG_NIOS2_HW_MUL_SUPPORT) && !cpuinfo.has_mul) |
Ley Foon Tan | 2612b87 | 2014-11-06 15:20:06 +0800 | [diff] [blame] | 76 | err_cpu("MUL"); |
Tobias Klauser | ac8ab8d | 2014-11-17 18:30:37 +0800 | [diff] [blame] | 77 | |
| 78 | if (IS_ENABLED(CONFIG_NIOS2_HW_MULX_SUPPORT) && !cpuinfo.has_mulx) |
Ley Foon Tan | 2612b87 | 2014-11-06 15:20:06 +0800 | [diff] [blame] | 79 | err_cpu("MULX"); |
Ley Foon Tan | 2612b87 | 2014-11-06 15:20:06 +0800 | [diff] [blame] | 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 | { |
Ley Foon Tan | 2612b87 | 2014-11-06 15:20:06 +0800 | [diff] [blame] | 124 | const u32 clockfreq = cpuinfo.cpu_clock_freq; |
| 125 | |
Joe Perches | 4122669 | 2015-04-15 16:18:00 -0700 | [diff] [blame] | 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)); |
Ley Foon Tan | 2612b87 | 2014-11-06 15:20:06 +0800 | [diff] [blame] | 139 | |
Joe Perches | 4122669 | 2015-04-15 16:18:00 -0700 | [diff] [blame] | 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"); |
Ley Foon Tan | 2612b87 | 2014-11-06 15:20:06 +0800 | [diff] [blame] | 148 | |
Joe Perches | 4122669 | 2015-04-15 16:18:00 -0700 | [diff] [blame] | 149 | seq_printf(m, |
| 150 | "Icache:\t\t%ukB, line length: %u\n", |
| 151 | cpuinfo.icache_size >> 10, |
| 152 | cpuinfo.icache_line_size); |
Ley Foon Tan | 2612b87 | 2014-11-06 15:20:06 +0800 | [diff] [blame] | 153 | |
Joe Perches | 4122669 | 2015-04-15 16:18:00 -0700 | [diff] [blame] | 154 | seq_printf(m, |
| 155 | "Dcache:\t\t%ukB, line length: %u\n", |
| 156 | cpuinfo.dcache_size >> 10, |
| 157 | cpuinfo.dcache_line_size); |
Ley Foon Tan | 2612b87 | 2014-11-06 15:20:06 +0800 | [diff] [blame] | 158 | |
Joe Perches | 4122669 | 2015-04-15 16:18:00 -0700 | [diff] [blame] | 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); |
Ley Foon Tan | 2612b87 | 2014-11-06 15:20:06 +0800 | [diff] [blame] | 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 */ |