cpu-probe.c (1709B)
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};