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- /*
- * Copyright (C) 2013 Altera Corporation
- * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
- *
- * Based on cpuinfo.c from microblaze
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- *
- */
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/delay.h>
- #include <linux/seq_file.h>
- #include <linux/string.h>
- #include <linux/of.h>
- #include <asm/cpuinfo.h>
- struct cpuinfo cpuinfo;
- #define err_cpu(x) \
- pr_err("ERROR: Nios II " x " different for kernel and DTS\n")
- static inline u32 fcpu(struct device_node *cpu, const char *n)
- {
- u32 val = 0;
- of_property_read_u32(cpu, n, &val);
- return val;
- }
- static inline u32 fcpu_has(struct device_node *cpu, const char *n)
- {
- return of_get_property(cpu, n, NULL) ? 1 : 0;
- }
- void __init setup_cpuinfo(void)
- {
- struct device_node *cpu;
- const char *str;
- int len;
- cpu = of_find_node_by_type(NULL, "cpu");
- if (!cpu)
- panic("%s: No CPU found in devicetree!\n", __func__);
- if (!fcpu_has(cpu, "altr,has-initda"))
- panic("initda instruction is unimplemented. Please update your "
- "hardware system to have more than 4-byte line data "
- "cache\n");
- cpuinfo.cpu_clock_freq = fcpu(cpu, "clock-frequency");
- str = of_get_property(cpu, "altr,implementation", &len);
- if (str)
- strlcpy(cpuinfo.cpu_impl, str, sizeof(cpuinfo.cpu_impl));
- else
- strcpy(cpuinfo.cpu_impl, "<unknown>");
- cpuinfo.has_div = fcpu_has(cpu, "altr,has-div");
- cpuinfo.has_mul = fcpu_has(cpu, "altr,has-mul");
- cpuinfo.has_mulx = fcpu_has(cpu, "altr,has-mulx");
- cpuinfo.mmu = fcpu_has(cpu, "altr,has-mmu");
- if (IS_ENABLED(CONFIG_NIOS2_HW_DIV_SUPPORT) && !cpuinfo.has_div)
- err_cpu("DIV");
- if (IS_ENABLED(CONFIG_NIOS2_HW_MUL_SUPPORT) && !cpuinfo.has_mul)
- err_cpu("MUL");
- if (IS_ENABLED(CONFIG_NIOS2_HW_MULX_SUPPORT) && !cpuinfo.has_mulx)
- err_cpu("MULX");
- cpuinfo.tlb_num_ways = fcpu(cpu, "altr,tlb-num-ways");
- if (!cpuinfo.tlb_num_ways)
- panic("altr,tlb-num-ways can't be 0. Please check your hardware "
- "system\n");
- cpuinfo.icache_line_size = fcpu(cpu, "icache-line-size");
- cpuinfo.icache_size = fcpu(cpu, "icache-size");
- if (CONFIG_NIOS2_ICACHE_SIZE != cpuinfo.icache_size)
- pr_warn("Warning: icache size configuration mismatch "
- "(0x%x vs 0x%x) of CONFIG_NIOS2_ICACHE_SIZE vs "
- "device tree icache-size\n",
- CONFIG_NIOS2_ICACHE_SIZE, cpuinfo.icache_size);
- cpuinfo.dcache_line_size = fcpu(cpu, "dcache-line-size");
- if (CONFIG_NIOS2_DCACHE_LINE_SIZE != cpuinfo.dcache_line_size)
- pr_warn("Warning: dcache line size configuration mismatch "
- "(0x%x vs 0x%x) of CONFIG_NIOS2_DCACHE_LINE_SIZE vs "
- "device tree dcache-line-size\n",
- CONFIG_NIOS2_DCACHE_LINE_SIZE, cpuinfo.dcache_line_size);
- cpuinfo.dcache_size = fcpu(cpu, "dcache-size");
- if (CONFIG_NIOS2_DCACHE_SIZE != cpuinfo.dcache_size)
- pr_warn("Warning: dcache size configuration mismatch "
- "(0x%x vs 0x%x) of CONFIG_NIOS2_DCACHE_SIZE vs "
- "device tree dcache-size\n",
- CONFIG_NIOS2_DCACHE_SIZE, cpuinfo.dcache_size);
- cpuinfo.tlb_pid_num_bits = fcpu(cpu, "altr,pid-num-bits");
- cpuinfo.tlb_num_ways_log2 = ilog2(cpuinfo.tlb_num_ways);
- cpuinfo.tlb_num_entries = fcpu(cpu, "altr,tlb-num-entries");
- cpuinfo.tlb_num_lines = cpuinfo.tlb_num_entries / cpuinfo.tlb_num_ways;
- cpuinfo.tlb_ptr_sz = fcpu(cpu, "altr,tlb-ptr-sz");
- cpuinfo.reset_addr = fcpu(cpu, "altr,reset-addr");
- cpuinfo.exception_addr = fcpu(cpu, "altr,exception-addr");
- cpuinfo.fast_tlb_miss_exc_addr = fcpu(cpu, "altr,fast-tlb-miss-addr");
- }
- #ifdef CONFIG_PROC_FS
- /*
- * Get CPU information for use by the procfs.
- */
- static int show_cpuinfo(struct seq_file *m, void *v)
- {
- const u32 clockfreq = cpuinfo.cpu_clock_freq;
- seq_printf(m,
- "CPU:\t\tNios II/%s\n"
- "MMU:\t\t%s\n"
- "FPU:\t\tnone\n"
- "Clocking:\t%u.%02u MHz\n"
- "BogoMips:\t%lu.%02lu\n"
- "Calibration:\t%lu loops\n",
- cpuinfo.cpu_impl,
- cpuinfo.mmu ? "present" : "none",
- clockfreq / 1000000, (clockfreq / 100000) % 10,
- (loops_per_jiffy * HZ) / 500000,
- ((loops_per_jiffy * HZ) / 5000) % 100,
- (loops_per_jiffy * HZ));
- seq_printf(m,
- "HW:\n"
- " MUL:\t\t%s\n"
- " MULX:\t\t%s\n"
- " DIV:\t\t%s\n",
- cpuinfo.has_mul ? "yes" : "no",
- cpuinfo.has_mulx ? "yes" : "no",
- cpuinfo.has_div ? "yes" : "no");
- seq_printf(m,
- "Icache:\t\t%ukB, line length: %u\n",
- cpuinfo.icache_size >> 10,
- cpuinfo.icache_line_size);
- seq_printf(m,
- "Dcache:\t\t%ukB, line length: %u\n",
- cpuinfo.dcache_size >> 10,
- cpuinfo.dcache_line_size);
- seq_printf(m,
- "TLB:\t\t%u ways, %u entries, %u PID bits\n",
- cpuinfo.tlb_num_ways,
- cpuinfo.tlb_num_entries,
- cpuinfo.tlb_pid_num_bits);
- return 0;
- }
- static void *cpuinfo_start(struct seq_file *m, loff_t *pos)
- {
- unsigned long i = *pos;
- return i < num_possible_cpus() ? (void *) (i + 1) : NULL;
- }
- static void *cpuinfo_next(struct seq_file *m, void *v, loff_t *pos)
- {
- ++*pos;
- return cpuinfo_start(m, pos);
- }
- static void cpuinfo_stop(struct seq_file *m, void *v)
- {
- }
- const struct seq_operations cpuinfo_op = {
- .start = cpuinfo_start,
- .next = cpuinfo_next,
- .stop = cpuinfo_stop,
- .show = show_cpuinfo
- };
- #endif /* CONFIG_PROC_FS */
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