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.has_cdx = of_property_read_bool(cpu, "altr,has-cdx"); 72 cpuinfo.mmu = of_property_read_bool(cpu, "altr,has-mmu"); 73 74 if (IS_ENABLED(CONFIG_NIOS2_HW_DIV_SUPPORT) && !cpuinfo.has_div) 75 err_cpu("DIV"); 76 77 if (IS_ENABLED(CONFIG_NIOS2_HW_MUL_SUPPORT) && !cpuinfo.has_mul) 78 err_cpu("MUL"); 79 80 if (IS_ENABLED(CONFIG_NIOS2_HW_MULX_SUPPORT) && !cpuinfo.has_mulx) 81 err_cpu("MULX"); 82 83 if (IS_ENABLED(CONFIG_NIOS2_BMX_SUPPORT) && !cpuinfo.has_bmx) 84 err_cpu("BMX"); 85 86 if (IS_ENABLED(CONFIG_NIOS2_CDX_SUPPORT) && !cpuinfo.has_cdx) 87 err_cpu("CDX"); 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 const u32 clockfreq = cpuinfo.cpu_clock_freq; 133 134 seq_printf(m, 135 "CPU:\t\tNios II/%s\n" 136 "REV:\t\t%i\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 CONFIG_NIOS2_ARCH_REVISION, 144 cpuinfo.mmu ? "present" : "none", 145 clockfreq / 1000000, (clockfreq / 100000) % 10, 146 (loops_per_jiffy * HZ) / 500000, 147 ((loops_per_jiffy * HZ) / 5000) % 100, 148 (loops_per_jiffy * HZ)); 149 150 seq_printf(m, 151 "HW:\n" 152 " MUL:\t\t%s\n" 153 " MULX:\t\t%s\n" 154 " DIV:\t\t%s\n" 155 " BMX:\t\t%s\n" 156 " CDX:\t\t%s\n", 157 cpuinfo.has_mul ? "yes" : "no", 158 cpuinfo.has_mulx ? "yes" : "no", 159 cpuinfo.has_div ? "yes" : "no", 160 cpuinfo.has_bmx ? "yes" : "no", 161 cpuinfo.has_cdx ? "yes" : "no"); 162 163 seq_printf(m, 164 "Icache:\t\t%ukB, line length: %u\n", 165 cpuinfo.icache_size >> 10, 166 cpuinfo.icache_line_size); 167 168 seq_printf(m, 169 "Dcache:\t\t%ukB, line length: %u\n", 170 cpuinfo.dcache_size >> 10, 171 cpuinfo.dcache_line_size); 172 173 seq_printf(m, 174 "TLB:\t\t%u ways, %u entries, %u PID bits\n", 175 cpuinfo.tlb_num_ways, 176 cpuinfo.tlb_num_entries, 177 cpuinfo.tlb_pid_num_bits); 178 179 return 0; 180 } 181 182 static void *cpuinfo_start(struct seq_file *m, loff_t *pos) 183 { 184 unsigned long i = *pos; 185 186 return i < num_possible_cpus() ? (void *) (i + 1) : NULL; 187 } 188 189 static void *cpuinfo_next(struct seq_file *m, void *v, loff_t *pos) 190 { 191 ++*pos; 192 return cpuinfo_start(m, pos); 193 } 194 195 static void cpuinfo_stop(struct seq_file *m, void *v) 196 { 197 } 198 199 const struct seq_operations cpuinfo_op = { 200 .start = cpuinfo_start, 201 .next = cpuinfo_next, 202 .stop = cpuinfo_stop, 203 .show = show_cpuinfo 204 }; 205 206 #endif /* CONFIG_PROC_FS */ 207