cpuinfo.c (5566B)
1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Copyright (C) 2013 Altera Corporation 4 * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> 5 * 6 * Based on cpuinfo.c from microblaze 7 */ 8 9#include <linux/kernel.h> 10#include <linux/init.h> 11#include <linux/delay.h> 12#include <linux/seq_file.h> 13#include <linux/string.h> 14#include <linux/of.h> 15#include <asm/cpuinfo.h> 16 17struct cpuinfo cpuinfo; 18 19#define err_cpu(x) \ 20 pr_err("ERROR: Nios II " x " different for kernel and DTS\n") 21 22static inline u32 fcpu(struct device_node *cpu, const char *n) 23{ 24 u32 val = 0; 25 26 of_property_read_u32(cpu, n, &val); 27 28 return val; 29} 30 31void __init setup_cpuinfo(void) 32{ 33 struct device_node *cpu; 34 const char *str; 35 int len; 36 37 cpu = of_get_cpu_node(0, NULL); 38 if (!cpu) 39 panic("%s: No CPU found in devicetree!\n", __func__); 40 41 if (!of_property_read_bool(cpu, "altr,has-initda")) 42 panic("initda instruction is unimplemented. Please update your " 43 "hardware system to have more than 4-byte line data " 44 "cache\n"); 45 46 cpuinfo.cpu_clock_freq = fcpu(cpu, "clock-frequency"); 47 48 str = of_get_property(cpu, "altr,implementation", &len); 49 if (str) 50 strlcpy(cpuinfo.cpu_impl, str, sizeof(cpuinfo.cpu_impl)); 51 else 52 strcpy(cpuinfo.cpu_impl, "<unknown>"); 53 54 cpuinfo.has_div = of_property_read_bool(cpu, "altr,has-div"); 55 cpuinfo.has_mul = of_property_read_bool(cpu, "altr,has-mul"); 56 cpuinfo.has_mulx = of_property_read_bool(cpu, "altr,has-mulx"); 57 cpuinfo.has_bmx = of_property_read_bool(cpu, "altr,has-bmx"); 58 cpuinfo.has_cdx = of_property_read_bool(cpu, "altr,has-cdx"); 59 cpuinfo.mmu = of_property_read_bool(cpu, "altr,has-mmu"); 60 61 if (IS_ENABLED(CONFIG_NIOS2_HW_DIV_SUPPORT) && !cpuinfo.has_div) 62 err_cpu("DIV"); 63 64 if (IS_ENABLED(CONFIG_NIOS2_HW_MUL_SUPPORT) && !cpuinfo.has_mul) 65 err_cpu("MUL"); 66 67 if (IS_ENABLED(CONFIG_NIOS2_HW_MULX_SUPPORT) && !cpuinfo.has_mulx) 68 err_cpu("MULX"); 69 70 if (IS_ENABLED(CONFIG_NIOS2_BMX_SUPPORT) && !cpuinfo.has_bmx) 71 err_cpu("BMX"); 72 73 if (IS_ENABLED(CONFIG_NIOS2_CDX_SUPPORT) && !cpuinfo.has_cdx) 74 err_cpu("CDX"); 75 76 cpuinfo.tlb_num_ways = fcpu(cpu, "altr,tlb-num-ways"); 77 if (!cpuinfo.tlb_num_ways) 78 panic("altr,tlb-num-ways can't be 0. Please check your hardware " 79 "system\n"); 80 cpuinfo.icache_line_size = fcpu(cpu, "icache-line-size"); 81 cpuinfo.icache_size = fcpu(cpu, "icache-size"); 82 if (CONFIG_NIOS2_ICACHE_SIZE != cpuinfo.icache_size) 83 pr_warn("Warning: icache size configuration mismatch " 84 "(0x%x vs 0x%x) of CONFIG_NIOS2_ICACHE_SIZE vs " 85 "device tree icache-size\n", 86 CONFIG_NIOS2_ICACHE_SIZE, cpuinfo.icache_size); 87 88 cpuinfo.dcache_line_size = fcpu(cpu, "dcache-line-size"); 89 if (CONFIG_NIOS2_DCACHE_LINE_SIZE != cpuinfo.dcache_line_size) 90 pr_warn("Warning: dcache line size configuration mismatch " 91 "(0x%x vs 0x%x) of CONFIG_NIOS2_DCACHE_LINE_SIZE vs " 92 "device tree dcache-line-size\n", 93 CONFIG_NIOS2_DCACHE_LINE_SIZE, cpuinfo.dcache_line_size); 94 cpuinfo.dcache_size = fcpu(cpu, "dcache-size"); 95 if (CONFIG_NIOS2_DCACHE_SIZE != cpuinfo.dcache_size) 96 pr_warn("Warning: dcache size configuration mismatch " 97 "(0x%x vs 0x%x) of CONFIG_NIOS2_DCACHE_SIZE vs " 98 "device tree dcache-size\n", 99 CONFIG_NIOS2_DCACHE_SIZE, cpuinfo.dcache_size); 100 101 cpuinfo.tlb_pid_num_bits = fcpu(cpu, "altr,pid-num-bits"); 102 cpuinfo.tlb_num_ways_log2 = ilog2(cpuinfo.tlb_num_ways); 103 cpuinfo.tlb_num_entries = fcpu(cpu, "altr,tlb-num-entries"); 104 cpuinfo.tlb_num_lines = cpuinfo.tlb_num_entries / cpuinfo.tlb_num_ways; 105 cpuinfo.tlb_ptr_sz = fcpu(cpu, "altr,tlb-ptr-sz"); 106 107 cpuinfo.reset_addr = fcpu(cpu, "altr,reset-addr"); 108 cpuinfo.exception_addr = fcpu(cpu, "altr,exception-addr"); 109 cpuinfo.fast_tlb_miss_exc_addr = fcpu(cpu, "altr,fast-tlb-miss-addr"); 110 111 of_node_put(cpu); 112} 113 114#ifdef CONFIG_PROC_FS 115 116/* 117 * Get CPU information for use by the procfs. 118 */ 119static int show_cpuinfo(struct seq_file *m, void *v) 120{ 121 const u32 clockfreq = cpuinfo.cpu_clock_freq; 122 123 seq_printf(m, 124 "CPU:\t\tNios II/%s\n" 125 "REV:\t\t%i\n" 126 "MMU:\t\t%s\n" 127 "FPU:\t\tnone\n" 128 "Clocking:\t%u.%02u MHz\n" 129 "BogoMips:\t%lu.%02lu\n" 130 "Calibration:\t%lu loops\n", 131 cpuinfo.cpu_impl, 132 CONFIG_NIOS2_ARCH_REVISION, 133 cpuinfo.mmu ? "present" : "none", 134 clockfreq / 1000000, (clockfreq / 100000) % 10, 135 (loops_per_jiffy * HZ) / 500000, 136 ((loops_per_jiffy * HZ) / 5000) % 100, 137 (loops_per_jiffy * HZ)); 138 139 seq_printf(m, 140 "HW:\n" 141 " MUL:\t\t%s\n" 142 " MULX:\t\t%s\n" 143 " DIV:\t\t%s\n" 144 " BMX:\t\t%s\n" 145 " CDX:\t\t%s\n", 146 cpuinfo.has_mul ? "yes" : "no", 147 cpuinfo.has_mulx ? "yes" : "no", 148 cpuinfo.has_div ? "yes" : "no", 149 cpuinfo.has_bmx ? "yes" : "no", 150 cpuinfo.has_cdx ? "yes" : "no"); 151 152 seq_printf(m, 153 "Icache:\t\t%ukB, line length: %u\n", 154 cpuinfo.icache_size >> 10, 155 cpuinfo.icache_line_size); 156 157 seq_printf(m, 158 "Dcache:\t\t%ukB, line length: %u\n", 159 cpuinfo.dcache_size >> 10, 160 cpuinfo.dcache_line_size); 161 162 seq_printf(m, 163 "TLB:\t\t%u ways, %u entries, %u PID bits\n", 164 cpuinfo.tlb_num_ways, 165 cpuinfo.tlb_num_entries, 166 cpuinfo.tlb_pid_num_bits); 167 168 return 0; 169} 170 171static void *cpuinfo_start(struct seq_file *m, loff_t *pos) 172{ 173 unsigned long i = *pos; 174 175 return i < num_possible_cpus() ? (void *) (i + 1) : NULL; 176} 177 178static void *cpuinfo_next(struct seq_file *m, void *v, loff_t *pos) 179{ 180 ++*pos; 181 return cpuinfo_start(m, pos); 182} 183 184static void cpuinfo_stop(struct seq_file *m, void *v) 185{ 186} 187 188const struct seq_operations cpuinfo_op = { 189 .start = cpuinfo_start, 190 .next = cpuinfo_next, 191 .stop = cpuinfo_stop, 192 .show = show_cpuinfo 193}; 194 195#endif /* CONFIG_PROC_FS */