// SPDX-License-Identifier: GPL-2.0
#include <linux/seq_file.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/machvec.h>
#include <asm/processor.h>

static const char *cpu_name[] = {
        [CPU_SH7201]    = "SH7201",
        [CPU_SH7203]    = "SH7203",     [CPU_SH7263]    = "SH7263",
        [CPU_SH7264]    = "SH7264",     [CPU_SH7269]    = "SH7269",
        [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
        [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
        [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
        [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
        [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
        [CPU_SH7721]    = "SH7721",     [CPU_SH7729]    = "SH7729",
        [CPU_SH7750]    = "SH7750",     [CPU_SH7750S]   = "SH7750S",
        [CPU_SH7750R]   = "SH7750R",    [CPU_SH7751]    = "SH7751",
        [CPU_SH7751R]   = "SH7751R",    [CPU_SH7760]    = "SH7760",
        [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
        [CPU_SH7763]    = "SH7763",     [CPU_SH7770]    = "SH7770",
        [CPU_SH7780]    = "SH7780",     [CPU_SH7781]    = "SH7781",
        [CPU_SH7343]    = "SH7343",     [CPU_SH7785]    = "SH7785",
        [CPU_SH7786]    = "SH7786",     [CPU_SH7757]    = "SH7757",
        [CPU_SH7722]    = "SH7722",     [CPU_SHX3]      = "SH-X3",
        [CPU_MXG]       = "MX-G",       [CPU_SH7723]    = "SH7723",
        [CPU_SH7366]    = "SH7366",     [CPU_SH7724]    = "SH7724",
        [CPU_SH7372]    = "SH7372",     [CPU_SH7734]    = "SH7734",
        [CPU_J2]        = "J2",
        [CPU_SH_NONE]   = "Unknown"
};

const char *get_cpu_subtype(struct sh_cpuinfo *c)
{
        return cpu_name[c->type];
}
EXPORT_SYMBOL(get_cpu_subtype);

#ifdef CONFIG_PROC_FS
/* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
static const char *cpu_flags[] = {
        "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
        "ptea", "llsc", "l2", "op32", "pteaex", NULL
};

static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
{
        unsigned long i;

        seq_printf(m, "cpu flags\t:");

        if (!c->flags) {
                seq_printf(m, " %s\n", cpu_flags[0]);
                return;
        }

        for (i = 0; cpu_flags[i]; i++)
                if ((c->flags & (1 << i)))
                        seq_printf(m, " %s", cpu_flags[i+1]);

        seq_printf(m, "\n");
}

static void show_cacheinfo(struct seq_file *m, const char *type,
                           struct cache_info info)
{
        unsigned int cache_size;

        cache_size = info.ways * info.sets * info.linesz;

        seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
                   type, cache_size >> 10, info.ways);
}

/*
 *      Get CPU information for use by the procfs.
 */
static int show_cpuinfo(struct seq_file *m, void *v)
{
        struct sh_cpuinfo *c = v;
        unsigned int cpu = c - cpu_data;

        if (!cpu_online(cpu))
                return 0;

        if (cpu == 0)
                seq_printf(m, "machine\t\t: %s\n", get_system_type());
        else
                seq_printf(m, "\n");

        seq_printf(m, "processor\t: %d\n", cpu);
        seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
        seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
        if (c->cut_major == -1)
                seq_printf(m, "cut\t\t: unknown\n");
        else if (c->cut_minor == -1)
                seq_printf(m, "cut\t\t: %d.x\n", c->cut_major);
        else
                seq_printf(m, "cut\t\t: %d.%d\n", c->cut_major, c->cut_minor);

        show_cpuflags(m, c);

        seq_printf(m, "cache type\t: ");

        /*
         * Check for what type of cache we have, we support both the
         * unified cache on the SH-2 and SH-3, as well as the harvard
         * style cache on the SH-4.
         */
        if (c->icache.flags & SH_CACHE_COMBINED) {
                seq_printf(m, "unified\n");
                show_cacheinfo(m, "cache", c->icache);
        } else {
                seq_printf(m, "split (harvard)\n");
                show_cacheinfo(m, "icache", c->icache);
                show_cacheinfo(m, "dcache", c->dcache);
        }

        /* Optional secondary cache */
        if (c->flags & CPU_HAS_L2_CACHE)
                show_cacheinfo(m, "scache", c->scache);

        seq_printf(m, "address sizes\t: %u bits physical\n", c->phys_bits);

        seq_printf(m, "bogomips\t: %lu.%02lu\n",
                     c->loops_per_jiffy/(500000/HZ),
                     (c->loops_per_jiffy/(5000/HZ)) % 100);

        return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
        return *pos < nr_cpu_ids ? cpu_data + *pos : NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
        ++*pos;
        return c_start(m, pos);
}
static void c_stop(struct seq_file *m, void *v)
{
}
const struct seq_operations cpuinfo_op = {
        .start  = c_start,
        .next   = c_next,
        .stop   = c_stop,
        .show   = show_cpuinfo,
};
#endif /* CONFIG_PROC_FS */