1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
|
/*
* Copyright (C) ST-Ericsson SA 2010
*
* License Terms: GNU General Public License v2
* Authors: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
* Bengt Jonsson <bengt.g.jonsson@stericsson.com> for ST-Ericsson
*
* UX500 common part of Power domain regulators
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/regulator/driver.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include "dbx500-prcmu.h"
/*
* power state reference count
*/
static int power_state_active_cnt; /* will initialize to zero */
static DEFINE_SPINLOCK(power_state_active_lock);
int power_state_active_get(void)
{
unsigned long flags;
int cnt;
spin_lock_irqsave(&power_state_active_lock, flags);
cnt = power_state_active_cnt;
spin_unlock_irqrestore(&power_state_active_lock, flags);
return cnt;
}
void power_state_active_enable(void)
{
unsigned long flags;
spin_lock_irqsave(&power_state_active_lock, flags);
power_state_active_cnt++;
spin_unlock_irqrestore(&power_state_active_lock, flags);
}
int power_state_active_disable(void)
{
int ret = 0;
unsigned long flags;
spin_lock_irqsave(&power_state_active_lock, flags);
if (power_state_active_cnt <= 0) {
pr_err("power state: unbalanced enable/disable calls\n");
ret = -EINVAL;
goto out;
}
power_state_active_cnt--;
out:
spin_unlock_irqrestore(&power_state_active_lock, flags);
return ret;
}
struct ux500_regulator {
char *name;
void (*enable)(void);
int (*disable)(void);
int count;
};
static struct ux500_regulator ux500_atomic_regulators[] = {
{
.name = "dma40.0",
.enable = power_state_active_enable,
.disable = power_state_active_disable,
},
{
.name = "ssp0",
.enable = power_state_active_enable,
.disable = power_state_active_disable,
},
{
.name = "ssp1",
.enable = power_state_active_enable,
.disable = power_state_active_disable,
},
{
.name = "spi0",
.enable = power_state_active_enable,
.disable = power_state_active_disable,
},
{
.name = "spi1",
.enable = power_state_active_enable,
.disable = power_state_active_disable,
},
{
.name = "spi2",
.enable = power_state_active_enable,
.disable = power_state_active_disable,
},
{
.name = "spi3",
.enable = power_state_active_enable,
.disable = power_state_active_disable,
},
{
.name = "cryp1",
.enable = power_state_active_enable,
.disable = power_state_active_disable,
},
{
.name = "hash1",
.enable = power_state_active_enable,
.disable = power_state_active_disable,
},
};
struct ux500_regulator *__must_check ux500_regulator_get(struct device *dev)
{
int i;
for (i = 0; i < ARRAY_SIZE(ux500_atomic_regulators); i++) {
if (!strcmp(dev_name(dev), ux500_atomic_regulators[i].name))
return &ux500_atomic_regulators[i];
}
return ERR_PTR(-EINVAL);
}
EXPORT_SYMBOL_GPL(ux500_regulator_get);
int ux500_regulator_atomic_enable(struct ux500_regulator *regulator)
{
if (regulator) {
regulator->count++;
regulator->enable();
return 0;
}
return -EINVAL;
}
EXPORT_SYMBOL_GPL(ux500_regulator_atomic_enable);
int ux500_regulator_atomic_disable(struct ux500_regulator *regulator)
{
if (regulator) {
regulator->count--;
return regulator->disable();
}
return -EINVAL;
}
EXPORT_SYMBOL_GPL(ux500_regulator_atomic_disable);
void ux500_regulator_put(struct ux500_regulator *regulator)
{
/* Here for symetric reasons and for possible future use */
}
EXPORT_SYMBOL_GPL(ux500_regulator_put);
#ifdef CONFIG_REGULATOR_DEBUG
static struct ux500_regulator_debug {
struct dentry *dir;
struct dbx500_regulator_info *regulator_array;
int num_regulators;
u8 *state_before_suspend;
u8 *state_after_suspend;
} rdebug;
void ux500_regulator_suspend_debug(void)
{
int i;
for (i = 0; i < rdebug.num_regulators; i++)
rdebug.state_before_suspend[i] =
rdebug.regulator_array[i].is_enabled;
}
void ux500_regulator_resume_debug(void)
{
int i;
for (i = 0; i < rdebug.num_regulators; i++)
rdebug.state_after_suspend[i] =
rdebug.regulator_array[i].is_enabled;
}
static int ux500_regulator_power_state_cnt_print(struct seq_file *s, void *p)
{
struct device *dev = s->private;
int err;
/* print power state count */
err = seq_printf(s, "ux500-regulator power state count: %i\n",
power_state_active_get());
if (err < 0)
dev_err(dev, "seq_printf overflow\n");
return 0;
}
static int ux500_regulator_power_state_cnt_open(struct inode *inode,
struct file *file)
{
return single_open(file, ux500_regulator_power_state_cnt_print,
inode->i_private);
}
static const struct file_operations ux500_regulator_power_state_cnt_fops = {
.open = ux500_regulator_power_state_cnt_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
static int ux500_regulator_power_state_use_print(struct seq_file *s, void *p)
{
int i;
seq_printf(s, "\nPower state usage:\n\n");
for (i = 0; i < ARRAY_SIZE(ux500_atomic_regulators); i++) {
seq_printf(s, "%s\t : %d\n",
ux500_atomic_regulators[i].name,
ux500_atomic_regulators[i].count);
}
return 0;
}
static int ux500_regulator_power_state_use_open(struct inode *inode,
struct file *file)
{
return single_open(file, ux500_regulator_power_state_use_print,
inode->i_private);
}
static const struct file_operations ux500_regulator_power_state_use_fops = {
.open = ux500_regulator_power_state_use_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
static int ux500_regulator_status_print(struct seq_file *s, void *p)
{
struct device *dev = s->private;
int err;
int i;
/* print dump header */
err = seq_printf(s, "ux500-regulator status:\n");
if (err < 0)
dev_err(dev, "seq_printf overflow\n");
err = seq_printf(s, "%31s : %8s : %8s\n", "current",
"before", "after");
if (err < 0)
dev_err(dev, "seq_printf overflow\n");
for (i = 0; i < rdebug.num_regulators; i++) {
struct dbx500_regulator_info *info;
/* Access per-regulator data */
info = &rdebug.regulator_array[i];
/* print status */
err = seq_printf(s, "%20s : %8s : %8s : %8s\n", info->desc.name,
info->is_enabled ? "enabled" : "disabled",
rdebug.state_before_suspend[i] ? "enabled" : "disabled",
rdebug.state_after_suspend[i] ? "enabled" : "disabled");
if (err < 0)
dev_err(dev, "seq_printf overflow\n");
}
return 0;
}
static int ux500_regulator_status_open(struct inode *inode, struct file *file)
{
return single_open(file, ux500_regulator_status_print,
inode->i_private);
}
static const struct file_operations ux500_regulator_status_fops = {
.open = ux500_regulator_status_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
int __attribute__((weak)) dbx500_regulator_testcase(
struct dbx500_regulator_info *regulator_info,
int num_regulators)
{
return 0;
}
int __devinit
ux500_regulator_debug_init(struct platform_device *pdev,
struct dbx500_regulator_info *regulator_info,
int num_regulators)
{
/* create directory */
rdebug.dir = debugfs_create_dir("ux500-regulator", NULL);
if (IS_ERR_OR_NULL(rdebug.dir))
goto exit_no_debugfs;
/* create "status" file */
if (IS_ERR_OR_NULL(debugfs_create_file("status",
S_IRUGO, rdebug.dir, &pdev->dev,
&ux500_regulator_status_fops)))
goto exit_fail;
/* create "power-state-count" file */
if (IS_ERR_OR_NULL(debugfs_create_file("power-state-count",
S_IRUGO, rdebug.dir, &pdev->dev,
&ux500_regulator_power_state_cnt_fops)))
goto exit_fail;
/* create "power-state-count" file */
if (IS_ERR_OR_NULL(debugfs_create_file("power-state-usage",
S_IRUGO, rdebug.dir, &pdev->dev,
&ux500_regulator_power_state_use_fops)))
goto exit_fail;
rdebug.regulator_array = regulator_info;
rdebug.num_regulators = num_regulators;
rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL);
if (!rdebug.state_before_suspend) {
dev_err(&pdev->dev,
"could not allocate memory for saving state\n");
goto exit_fail;
}
rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL);
if (!rdebug.state_after_suspend) {
dev_err(&pdev->dev,
"could not allocate memory for saving state\n");
goto exit_fail;
}
dbx500_regulator_testcase(regulator_info, num_regulators);
return 0;
exit_fail:
kfree(rdebug.state_before_suspend);
debugfs_remove_recursive(rdebug.dir);
exit_no_debugfs:
dev_err(&pdev->dev, "failed to create debugfs entries.\n");
return -ENOMEM;
}
int __devexit ux500_regulator_debug_exit(void)
{
debugfs_remove_recursive(rdebug.dir);
kfree(rdebug.state_after_suspend);
kfree(rdebug.state_before_suspend);
return 0;
}
#endif
|
