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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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