1 /*
2 * Copyright (C) 2007 Google, Inc.
3 * Copyright (c) 2007-2010, Code Aurora Forum. All rights reserved.
4 *
5 * This software is licensed under the terms of the GNU General Public
6 * License version 2, as published by the Free Software Foundation, and
7 * may be copied, distributed, and modified under those terms.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 */
15
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/ctype.h>
19 #include <linux/debugfs.h>
20 #include <linux/clk.h>
21 #include "clock.h"
22
clock_debug_rate_set(void * data,u64 val)23 static int clock_debug_rate_set(void *data, u64 val)
24 {
25 struct clk *clock = data;
26 int ret;
27
28 /* Only increases to max rate will succeed, but that's actually good
29 * for debugging purposes so we don't check for error. */
30 if (clock->flags & CLK_MAX)
31 clk_set_max_rate(clock, val);
32 if (clock->flags & CLK_MIN)
33 ret = clk_set_min_rate(clock, val);
34 else
35 ret = clk_set_rate(clock, val);
36 if (ret != 0)
37 printk(KERN_ERR "clk_set%s_rate failed (%d)\n",
38 (clock->flags & CLK_MIN) ? "_min" : "", ret);
39 return ret;
40 }
41
clock_debug_rate_get(void * data,u64 * val)42 static int clock_debug_rate_get(void *data, u64 *val)
43 {
44 struct clk *clock = data;
45 *val = clk_get_rate(clock);
46 return 0;
47 }
48
49 DEFINE_SIMPLE_ATTRIBUTE(clock_rate_fops, clock_debug_rate_get,
50 clock_debug_rate_set, "%llu\n");
51
clock_debug_enable_set(void * data,u64 val)52 static int clock_debug_enable_set(void *data, u64 val)
53 {
54 struct clk *clock = data;
55 int rc = 0;
56
57 if (val)
58 rc = clock->ops->enable(clock->id);
59 else
60 clock->ops->disable(clock->id);
61
62 return rc;
63 }
64
clock_debug_enable_get(void * data,u64 * val)65 static int clock_debug_enable_get(void *data, u64 *val)
66 {
67 struct clk *clock = data;
68
69 *val = clock->ops->is_enabled(clock->id);
70
71 return 0;
72 }
73
74 DEFINE_SIMPLE_ATTRIBUTE(clock_enable_fops, clock_debug_enable_get,
75 clock_debug_enable_set, "%llu\n");
76
clock_debug_local_get(void * data,u64 * val)77 static int clock_debug_local_get(void *data, u64 *val)
78 {
79 struct clk *clock = data;
80
81 *val = clock->ops->is_local(clock->id);
82
83 return 0;
84 }
85
86 DEFINE_SIMPLE_ATTRIBUTE(clock_local_fops, clock_debug_local_get,
87 NULL, "%llu\n");
88
89 static struct dentry *debugfs_base;
90
clock_debug_init(void)91 int __init clock_debug_init(void)
92 {
93 debugfs_base = debugfs_create_dir("clk", NULL);
94 if (!debugfs_base)
95 return -ENOMEM;
96 return 0;
97 }
98
clock_debug_add(struct clk * clock)99 int __init clock_debug_add(struct clk *clock)
100 {
101 char temp[50], *ptr;
102 struct dentry *clk_dir;
103
104 if (!debugfs_base)
105 return -ENOMEM;
106
107 strncpy(temp, clock->dbg_name, ARRAY_SIZE(temp)-1);
108 for (ptr = temp; *ptr; ptr++)
109 *ptr = tolower(*ptr);
110
111 clk_dir = debugfs_create_dir(temp, debugfs_base);
112 if (!clk_dir)
113 return -ENOMEM;
114
115 if (!debugfs_create_file("rate", S_IRUGO | S_IWUSR, clk_dir,
116 clock, &clock_rate_fops))
117 goto error;
118
119 if (!debugfs_create_file("enable", S_IRUGO | S_IWUSR, clk_dir,
120 clock, &clock_enable_fops))
121 goto error;
122
123 if (!debugfs_create_file("is_local", S_IRUGO, clk_dir, clock,
124 &clock_local_fops))
125 goto error;
126 return 0;
127 error:
128 debugfs_remove_recursive(clk_dir);
129 return -ENOMEM;
130 }
131