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