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TOMOYO Linux Cross Reference
Linux/arch/nios2/kernel/cpuinfo.c

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  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 static inline u32 fcpu_has(struct device_node *cpu, const char *n)
 45 {
 46         return of_get_property(cpu, n, NULL) ? 1 : 0;
 47 }
 48 
 49 void __init setup_cpuinfo(void)
 50 {
 51         struct device_node *cpu;
 52         const char *str;
 53         int len;
 54 
 55         cpu = of_find_node_by_type(NULL, "cpu");
 56         if (!cpu)
 57                 panic("%s: No CPU found in devicetree!\n", __func__);
 58 
 59         if (!fcpu_has(cpu, "altr,has-initda"))
 60                 panic("initda instruction is unimplemented. Please update your "
 61                         "hardware system to have more than 4-byte line data "
 62                         "cache\n");
 63 
 64         cpuinfo.cpu_clock_freq = fcpu(cpu, "clock-frequency");
 65 
 66         str = of_get_property(cpu, "altr,implementation", &len);
 67         if (str)
 68                 strlcpy(cpuinfo.cpu_impl, str, sizeof(cpuinfo.cpu_impl));
 69         else
 70                 strcpy(cpuinfo.cpu_impl, "<unknown>");
 71 
 72         cpuinfo.has_div = fcpu_has(cpu, "altr,has-div");
 73         cpuinfo.has_mul = fcpu_has(cpu, "altr,has-mul");
 74         cpuinfo.has_mulx = fcpu_has(cpu, "altr,has-mulx");
 75         cpuinfo.mmu = fcpu_has(cpu, "altr,has-mmu");
 76 
 77         if (IS_ENABLED(CONFIG_NIOS2_HW_DIV_SUPPORT) && !cpuinfo.has_div)
 78                 err_cpu("DIV");
 79 
 80         if (IS_ENABLED(CONFIG_NIOS2_HW_MUL_SUPPORT) && !cpuinfo.has_mul)
 81                 err_cpu("MUL");
 82 
 83         if (IS_ENABLED(CONFIG_NIOS2_HW_MULX_SUPPORT) && !cpuinfo.has_mulx)
 84                 err_cpu("MULX");
 85 
 86         cpuinfo.tlb_num_ways = fcpu(cpu, "altr,tlb-num-ways");
 87         if (!cpuinfo.tlb_num_ways)
 88                 panic("altr,tlb-num-ways can't be 0. Please check your hardware "
 89                         "system\n");
 90         cpuinfo.icache_line_size = fcpu(cpu, "icache-line-size");
 91         cpuinfo.icache_size = fcpu(cpu, "icache-size");
 92         if (CONFIG_NIOS2_ICACHE_SIZE != cpuinfo.icache_size)
 93                 pr_warn("Warning: icache size configuration mismatch "
 94                 "(0x%x vs 0x%x) of CONFIG_NIOS2_ICACHE_SIZE vs "
 95                 "device tree icache-size\n",
 96                 CONFIG_NIOS2_ICACHE_SIZE, cpuinfo.icache_size);
 97 
 98         cpuinfo.dcache_line_size = fcpu(cpu, "dcache-line-size");
 99         if (CONFIG_NIOS2_DCACHE_LINE_SIZE != cpuinfo.dcache_line_size)
100                 pr_warn("Warning: dcache line size configuration mismatch "
101                 "(0x%x vs 0x%x) of CONFIG_NIOS2_DCACHE_LINE_SIZE vs "
102                 "device tree dcache-line-size\n",
103                 CONFIG_NIOS2_DCACHE_LINE_SIZE, cpuinfo.dcache_line_size);
104         cpuinfo.dcache_size = fcpu(cpu, "dcache-size");
105         if (CONFIG_NIOS2_DCACHE_SIZE != cpuinfo.dcache_size)
106                 pr_warn("Warning: dcache size configuration mismatch "
107                         "(0x%x vs 0x%x) of CONFIG_NIOS2_DCACHE_SIZE vs "
108                         "device tree dcache-size\n",
109                         CONFIG_NIOS2_DCACHE_SIZE, cpuinfo.dcache_size);
110 
111         cpuinfo.tlb_pid_num_bits = fcpu(cpu, "altr,pid-num-bits");
112         cpuinfo.tlb_num_ways_log2 = ilog2(cpuinfo.tlb_num_ways);
113         cpuinfo.tlb_num_entries = fcpu(cpu, "altr,tlb-num-entries");
114         cpuinfo.tlb_num_lines = cpuinfo.tlb_num_entries / cpuinfo.tlb_num_ways;
115         cpuinfo.tlb_ptr_sz = fcpu(cpu, "altr,tlb-ptr-sz");
116 
117         cpuinfo.reset_addr = fcpu(cpu, "altr,reset-addr");
118         cpuinfo.exception_addr = fcpu(cpu, "altr,exception-addr");
119         cpuinfo.fast_tlb_miss_exc_addr = fcpu(cpu, "altr,fast-tlb-miss-addr");
120 }
121 
122 #ifdef CONFIG_PROC_FS
123 
124 /*
125  * Get CPU information for use by the procfs.
126  */
127 static int show_cpuinfo(struct seq_file *m, void *v)
128 {
129         const u32 clockfreq = cpuinfo.cpu_clock_freq;
130 
131         seq_printf(m,
132                    "CPU:\t\tNios II/%s\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                    cpuinfo.mmu ? "present" : "none",
140                    clockfreq / 1000000, (clockfreq / 100000) % 10,
141                    (loops_per_jiffy * HZ) / 500000,
142                    ((loops_per_jiffy * HZ) / 5000) % 100,
143                    (loops_per_jiffy * HZ));
144 
145         seq_printf(m,
146                    "HW:\n"
147                    " MUL:\t\t%s\n"
148                    " MULX:\t\t%s\n"
149                    " DIV:\t\t%s\n",
150                    cpuinfo.has_mul ? "yes" : "no",
151                    cpuinfo.has_mulx ? "yes" : "no",
152                    cpuinfo.has_div ? "yes" : "no");
153 
154         seq_printf(m,
155                    "Icache:\t\t%ukB, line length: %u\n",
156                    cpuinfo.icache_size >> 10,
157                    cpuinfo.icache_line_size);
158 
159         seq_printf(m,
160                    "Dcache:\t\t%ukB, line length: %u\n",
161                    cpuinfo.dcache_size >> 10,
162                    cpuinfo.dcache_line_size);
163 
164         seq_printf(m,
165                    "TLB:\t\t%u ways, %u entries, %u PID bits\n",
166                    cpuinfo.tlb_num_ways,
167                    cpuinfo.tlb_num_entries,
168                    cpuinfo.tlb_pid_num_bits);
169 
170         return 0;
171 }
172 
173 static void *cpuinfo_start(struct seq_file *m, loff_t *pos)
174 {
175         unsigned long i = *pos;
176 
177         return i < num_possible_cpus() ? (void *) (i + 1) : NULL;
178 }
179 
180 static void *cpuinfo_next(struct seq_file *m, void *v, loff_t *pos)
181 {
182         ++*pos;
183         return cpuinfo_start(m, pos);
184 }
185 
186 static void cpuinfo_stop(struct seq_file *m, void *v)
187 {
188 }
189 
190 const struct seq_operations cpuinfo_op = {
191         .start  = cpuinfo_start,
192         .next   = cpuinfo_next,
193         .stop   = cpuinfo_stop,
194         .show   = show_cpuinfo
195 };
196 
197 #endif /* CONFIG_PROC_FS */
198 

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