diff options
Diffstat (limited to 'arch/nios2/kernel/cpuinfo.c')
| -rw-r--r-- | arch/nios2/kernel/cpuinfo.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/arch/nios2/kernel/cpuinfo.c b/arch/nios2/kernel/cpuinfo.c new file mode 100644 index 000000000000..b8081c5f50a1 --- /dev/null +++ b/arch/nios2/kernel/cpuinfo.c @@ -0,0 +1,201 @@ +/* + * 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"); + +#ifdef CONFIG_NIOS2_HW_DIV_SUPPORT + if (!cpuinfo.has_div) + err_cpu("DIV"); +#endif +#ifdef CONFIG_NIOS2_HW_MUL_SUPPORT + if (!cpuinfo.has_mul) + err_cpu("MUL"); +#endif +#ifdef CONFIG_NIOS2_HW_MULX_SUPPORT + if (!cpuinfo.has_mulx) + err_cpu("MULX"); +#endif + + 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) +{ + int count = 0; + const u32 clockfreq = cpuinfo.cpu_clock_freq; + + count = 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)); + + count += 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"); + + count += seq_printf(m, + "Icache:\t\t%ukB, line length: %u\n", + cpuinfo.icache_size >> 10, + cpuinfo.icache_line_size); + + count += seq_printf(m, + "Dcache:\t\t%ukB, line length: %u\n", + cpuinfo.dcache_size >> 10, + cpuinfo.dcache_line_size); + + count += 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 */ |