1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2015 Imagination Technologies
4 * Author: Paul Burton <paul.burton@mips.com>
5 */
6
7#include <asm/bcache.h>
8#include <asm/debug.h>
9#include <linux/uaccess.h>
10#include <linux/debugfs.h>
11#include <linux/init.h>
12
13static ssize_t sc_prefetch_read(struct file *file, char __user *user_buf,
14				size_t count, loff_t *ppos)
15{
16	bool enabled = bc_prefetch_is_enabled();
17	char buf[3];
18
19	buf[0] = enabled ? 'Y' : 'N';
20	buf[1] = '\n';
21	buf[2] = 0;
22
23	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
24}
25
26static ssize_t sc_prefetch_write(struct file *file,
27				 const char __user *user_buf,
28				 size_t count, loff_t *ppos)
29{
30	bool enabled;
31	int err;
32
33	err = kstrtobool_from_user(user_buf, count, &enabled);
34	if (err)
35		return err;
36
37	if (enabled)
38		bc_prefetch_enable();
39	else
40		bc_prefetch_disable();
41
42	return count;
43}
44
45static const struct file_operations sc_prefetch_fops = {
46	.open = simple_open,
47	.llseek = default_llseek,
48	.read = sc_prefetch_read,
49	.write = sc_prefetch_write,
50};
51
52static int __init sc_debugfs_init(void)
53{
54	struct dentry *dir;
55
56	dir = debugfs_create_dir("l2cache", mips_debugfs_dir);
57	debugfs_create_file("prefetch", S_IRUGO | S_IWUSR, dir, NULL,
58			    &sc_prefetch_fops);
59	return 0;
60}
61late_initcall(sc_debugfs_init);
62