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 | |
11 | static 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, fmt: "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, fmt: "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, fmt: "hint (CPU funcs): 0x%08x\n" , mfcr_hint()); |
41 | seq_printf(m, fmt: "ccr (L1C & MMU): 0x%08x\n" , mfcr("cr18" )); |
42 | seq_printf(m, fmt: "ccr2 (L2C) : 0x%08x\n" , mfcr_ccr2()); |
43 | seq_printf(m, fmt: "\n" ); |
44 | } |
45 | |
46 | static 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(cpuid: cpu, func: percpu_print, info: m, wait: 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 | |
61 | static void *c_start(struct seq_file *m, loff_t *pos) |
62 | { |
63 | return *pos < 1 ? (void *)1 : NULL; |
64 | } |
65 | |
66 | static void *c_next(struct seq_file *m, void *v, loff_t *pos) |
67 | { |
68 | ++*pos; |
69 | return NULL; |
70 | } |
71 | |
72 | static void c_stop(struct seq_file *m, void *v) {} |
73 | |
74 | const struct seq_operations cpuinfo_op = { |
75 | .start = c_start, |
76 | .next = c_next, |
77 | .stop = c_stop, |
78 | .show = c_show, |
79 | }; |
80 | |