1/*
2 * Copyright (C) 2015 Imagination Technologies
3 * Author: Paul Burton <paul.burton@imgtec.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 */
10
11#include <asm/bcache.h>
12#include <asm/debug.h>
13#include <asm/uaccess.h>
14#include <linux/debugfs.h>
15#include <linux/init.h>
16
17static ssize_t sc_prefetch_read(struct file *file, char __user *user_buf,
18				size_t count, loff_t *ppos)
19{
20	bool enabled = bc_prefetch_is_enabled();
21	char buf[3];
22
23	buf[0] = enabled ? 'Y' : 'N';
24	buf[1] = '\n';
25	buf[2] = 0;
26
27	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
28}
29
30static ssize_t sc_prefetch_write(struct file *file,
31				 const char __user *user_buf,
32				 size_t count, loff_t *ppos)
33{
34	char buf[32];
35	ssize_t buf_size;
36	bool enabled;
37	int err;
38
39	buf_size = min(count, sizeof(buf) - 1);
40	if (copy_from_user(buf, user_buf, buf_size))
41		return -EFAULT;
42
43	buf[buf_size] = '\0';
44	err = strtobool(buf, &enabled);
45	if (err)
46		return err;
47
48	if (enabled)
49		bc_prefetch_enable();
50	else
51		bc_prefetch_disable();
52
53	return count;
54}
55
56static const struct file_operations sc_prefetch_fops = {
57	.open = simple_open,
58	.llseek = default_llseek,
59	.read = sc_prefetch_read,
60	.write = sc_prefetch_write,
61};
62
63static int __init sc_debugfs_init(void)
64{
65	struct dentry *dir, *file;
66
67	if (!mips_debugfs_dir)
68		return -ENODEV;
69
70	dir = debugfs_create_dir("l2cache", mips_debugfs_dir);
71	if (IS_ERR(dir))
72		return PTR_ERR(dir);
73
74	file = debugfs_create_file("prefetch", S_IRUGO | S_IWUSR, dir,
75				   NULL, &sc_prefetch_fops);
76	if (IS_ERR(file))
77		return PTR_ERR(file);
78
79	return 0;
80}
81late_initcall(sc_debugfs_init);
82