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 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 54 if (!of_property_read_bool(cpu, "altr,has-initda")) 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 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.has_bmx = of_property_read_bool(cpu, "altr,has-bmx"); 71 cpuinfo.mmu = of_property_read_bool(cpu, "altr,has-mmu"); 72 73 if (IS_ENABLED(CONFIG_NIOS2_HW_DIV_SUPPORT) && !cpuinfo.has_div) 74 err_cpu("DIV"); 75 76 if (IS_ENABLED(CONFIG_NIOS2_HW_MUL_SUPPORT) && !cpuinfo.has_mul) 77 err_cpu("MUL"); 78 79 if (IS_ENABLED(CONFIG_NIOS2_HW_MULX_SUPPORT) && !cpuinfo.has_mulx) 80 err_cpu("MULX"); 81 82 if (IS_ENABLED(CONFIG_NIOS2_BMX_SUPPORT) && !cpuinfo.has_bmx) 83 err_cpu("BMX"); 84 85 cpuinfo.tlb_num_ways = fcpu(cpu, "altr,tlb-num-ways"); 86 if (!cpuinfo.tlb_num_ways) 87 panic("altr,tlb-num-ways can't be 0. Please check your hardware " 88 "system\n"); 89 cpuinfo.icache_line_size = fcpu(cpu, "icache-line-size"); 90 cpuinfo.icache_size = fcpu(cpu, "icache-size"); 91 if (CONFIG_NIOS2_ICACHE_SIZE != cpuinfo.icache_size) 92 pr_warn("Warning: icache size configuration mismatch " 93 "(0x%x vs 0x%x) of CONFIG_NIOS2_ICACHE_SIZE vs " 94 "device tree icache-size\n", 95 CONFIG_NIOS2_ICACHE_SIZE, cpuinfo.icache_size); 96 97 cpuinfo.dcache_line_size = fcpu(cpu, "dcache-line-size"); 98 if (CONFIG_NIOS2_DCACHE_LINE_SIZE != cpuinfo.dcache_line_size) 99 pr_warn("Warning: dcache line size configuration mismatch " 100 "(0x%x vs 0x%x) of CONFIG_NIOS2_DCACHE_LINE_SIZE vs " 101 "device tree dcache-line-size\n", 102 CONFIG_NIOS2_DCACHE_LINE_SIZE, cpuinfo.dcache_line_size); 103 cpuinfo.dcache_size = fcpu(cpu, "dcache-size"); 104 if (CONFIG_NIOS2_DCACHE_SIZE != cpuinfo.dcache_size) 105 pr_warn("Warning: dcache size configuration mismatch " 106 "(0x%x vs 0x%x) of CONFIG_NIOS2_DCACHE_SIZE vs " 107 "device tree dcache-size\n", 108 CONFIG_NIOS2_DCACHE_SIZE, cpuinfo.dcache_size); 109 110 cpuinfo.tlb_pid_num_bits = fcpu(cpu, "altr,pid-num-bits"); 111 cpuinfo.tlb_num_ways_log2 = ilog2(cpuinfo.tlb_num_ways); 112 cpuinfo.tlb_num_entries = fcpu(cpu, "altr,tlb-num-entries"); 113 cpuinfo.tlb_num_lines = cpuinfo.tlb_num_entries / cpuinfo.tlb_num_ways; 114 cpuinfo.tlb_ptr_sz = fcpu(cpu, "altr,tlb-ptr-sz"); 115 116 cpuinfo.reset_addr = fcpu(cpu, "altr,reset-addr"); 117 cpuinfo.exception_addr = fcpu(cpu, "altr,exception-addr"); 118 cpuinfo.fast_tlb_miss_exc_addr = fcpu(cpu, "altr,fast-tlb-miss-addr"); 119 } 120 121 #ifdef CONFIG_PROC_FS 122 123 /* 124 * Get CPU information for use by the procfs. 125 */ 126 static int show_cpuinfo(struct seq_file *m, void *v) 127 { 128 const u32 clockfreq = cpuinfo.cpu_clock_freq; 129 130 seq_printf(m, 131 "CPU:\t\tNios II/%s\n" 132 "REV:\t\t%i\n" 133 "MMU:\t\t%s\n" 134 "FPU:\t\tnone\n" 135 "Clocking:\t%u.%02u MHz\n" 136 "BogoMips:\t%lu.%02lu\n" 137 "Calibration:\t%lu loops\n", 138 cpuinfo.cpu_impl, 139 CONFIG_NIOS2_ARCH_REVISION, 140 cpuinfo.mmu ? "present" : "none", 141 clockfreq / 1000000, (clockfreq / 100000) % 10, 142 (loops_per_jiffy * HZ) / 500000, 143 ((loops_per_jiffy * HZ) / 5000) % 100, 144 (loops_per_jiffy * HZ)); 145 146 seq_printf(m, 147 "HW:\n" 148 " MUL:\t\t%s\n" 149 " MULX:\t\t%s\n" 150 " DIV:\t\t%s\n" 151 " BMX:\t\t%s\n", 152 cpuinfo.has_mul ? "yes" : "no", 153 cpuinfo.has_mulx ? "yes" : "no", 154 cpuinfo.has_div ? "yes" : "no", 155 cpuinfo.has_bmx ? "yes" : "no"); 156 157 seq_printf(m, 158 "Icache:\t\t%ukB, line length: %u\n", 159 cpuinfo.icache_size >> 10, 160 cpuinfo.icache_line_size); 161 162 seq_printf(m, 163 "Dcache:\t\t%ukB, line length: %u\n", 164 cpuinfo.dcache_size >> 10, 165 cpuinfo.dcache_line_size); 166 167 seq_printf(m, 168 "TLB:\t\t%u ways, %u entries, %u PID bits\n", 169 cpuinfo.tlb_num_ways, 170 cpuinfo.tlb_num_entries, 171 cpuinfo.tlb_pid_num_bits); 172 173 return 0; 174 } 175 176 static void *cpuinfo_start(struct seq_file *m, loff_t *pos) 177 { 178 unsigned long i = *pos; 179 180 return i < num_possible_cpus() ? (void *) (i + 1) : NULL; 181 } 182 183 static void *cpuinfo_next(struct seq_file *m, void *v, loff_t *pos) 184 { 185 ++*pos; 186 return cpuinfo_start(m, pos); 187 } 188 189 static void cpuinfo_stop(struct seq_file *m, void *v) 190 { 191 } 192 193 const struct seq_operations cpuinfo_op = { 194 .start = cpuinfo_start, 195 .next = cpuinfo_next, 196 .stop = cpuinfo_stop, 197 .show = show_cpuinfo 198 }; 199 200 #endif /* CONFIG_PROC_FS */ 201