LXR linux/arch/csky/kernel/cpu-probe.c

   1// SPDX-License-Identifier: GPL-2.0
   2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
   3
   4#include <linux/of.h>
   5#include <linux/init.h>
   6#include <linux/seq_file.h>
   7#include <linux/memblock.h>
   8
   9#include <abi/reg_ops.h>
  10
  11static void percpu_print(void *arg)
  12{
  13        struct seq_file *m = (struct seq_file *)arg;
  14        unsigned int cur, next, i;
  15
  16        seq_printf(m, "processor       : %d\n", smp_processor_id());
  17        seq_printf(m, "C-SKY CPU model : %s\n", CSKYCPU_DEF_NAME);
  18
  19        /* read processor id, max is 100 */
  20        cur  = mfcr("cr13");
  21        for (i = 0; i < 100; i++) {
  22                seq_printf(m, "product info[%d] : 0x%08x\n", i, cur);
  23
  24                next = mfcr("cr13");
  25
  26                /* some CPU only has one id reg */
  27                if (cur == next)
  28                        break;
  29
  30                cur = next;
  31
  32                /* cpid index is 31-28, reset */
  33                if (!(next >> 28)) {
  34                        while ((mfcr("cr13") >> 28) != i);
  35                        break;
  36                }
  37        }
  38
  39        /* CPU feature regs, setup by bootloader or gdbinit */
  40        seq_printf(m, "hint (CPU funcs): 0x%08x\n", mfcr_hint());
  41        seq_printf(m, "ccr  (L1C & MMU): 0x%08x\n", mfcr("cr18"));
  42        seq_printf(m, "ccr2 (L2C)      : 0x%08x\n", mfcr_ccr2());
  43        seq_printf(m, "\n");
  44}
  45
  46static int c_show(struct seq_file *m, void *v)
  47{
  48        int cpu;
  49
  50        for_each_online_cpu(cpu)
  51                smp_call_function_single(cpu, percpu_print, m, true);
  52
  53#ifdef CSKY_ARCH_VERSION
  54        seq_printf(m, "arch-version : %s\n", CSKY_ARCH_VERSION);
  55        seq_printf(m, "\n");
  56#endif
  57
  58        return 0;
  59}
  60
  61static void *c_start(struct seq_file *m, loff_t *pos)
  62{
  63        return *pos < 1 ? (void *)1 : NULL;
  64}
  65
  66static void *c_next(struct seq_file *m, void *v, loff_t *pos)
  67{
  68        ++*pos;
  69        return NULL;
  70}
  71
  72static void c_stop(struct seq_file *m, void *v) {}
  73
  74const struct seq_operations cpuinfo_op = {
  75        .start  = c_start,
  76        .next   = c_next,
  77        .stop   = c_stop,
  78        .show   = c_show,
  79};
  80