This source file includes following definitions.
- clk_find
- clk_find_hw
- __clk_get_sys
- clk_get_sys
- clk_get
- clk_put
- __clkdev_add
- clkdev_add
- clkdev_add_table
- vclkdev_alloc
- vclkdev_create
- clkdev_alloc
- clkdev_hw_alloc
- clkdev_create
- clkdev_hw_create
- clk_add_alias
- clkdev_drop
- __clk_register_clkdev
- do_clk_register_clkdev
- clk_register_clkdev
- clk_hw_register_clkdev
- devm_clkdev_release
- devm_clk_match_clkdev
- devm_clk_release_clkdev
- devm_clk_hw_register_clkdev
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9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/device.h>
12 #include <linux/list.h>
13 #include <linux/errno.h>
14 #include <linux/err.h>
15 #include <linux/string.h>
16 #include <linux/mutex.h>
17 #include <linux/clk.h>
18 #include <linux/clkdev.h>
19 #include <linux/clk-provider.h>
20 #include <linux/of.h>
21
22 #include "clk.h"
23
24 static LIST_HEAD(clocks);
25 static DEFINE_MUTEX(clocks_mutex);
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35
36 static struct clk_lookup *clk_find(const char *dev_id, const char *con_id)
37 {
38 struct clk_lookup *p, *cl = NULL;
39 int match, best_found = 0, best_possible = 0;
40
41 if (dev_id)
42 best_possible += 2;
43 if (con_id)
44 best_possible += 1;
45
46 lockdep_assert_held(&clocks_mutex);
47
48 list_for_each_entry(p, &clocks, node) {
49 match = 0;
50 if (p->dev_id) {
51 if (!dev_id || strcmp(p->dev_id, dev_id))
52 continue;
53 match += 2;
54 }
55 if (p->con_id) {
56 if (!con_id || strcmp(p->con_id, con_id))
57 continue;
58 match += 1;
59 }
60
61 if (match > best_found) {
62 cl = p;
63 if (match != best_possible)
64 best_found = match;
65 else
66 break;
67 }
68 }
69 return cl;
70 }
71
72 struct clk_hw *clk_find_hw(const char *dev_id, const char *con_id)
73 {
74 struct clk_lookup *cl;
75 struct clk_hw *hw = ERR_PTR(-ENOENT);
76
77 mutex_lock(&clocks_mutex);
78 cl = clk_find(dev_id, con_id);
79 if (cl)
80 hw = cl->clk_hw;
81 mutex_unlock(&clocks_mutex);
82
83 return hw;
84 }
85
86 static struct clk *__clk_get_sys(struct device *dev, const char *dev_id,
87 const char *con_id)
88 {
89 struct clk_hw *hw = clk_find_hw(dev_id, con_id);
90
91 return clk_hw_create_clk(dev, hw, dev_id, con_id);
92 }
93
94 struct clk *clk_get_sys(const char *dev_id, const char *con_id)
95 {
96 return __clk_get_sys(NULL, dev_id, con_id);
97 }
98 EXPORT_SYMBOL(clk_get_sys);
99
100 struct clk *clk_get(struct device *dev, const char *con_id)
101 {
102 const char *dev_id = dev ? dev_name(dev) : NULL;
103 struct clk_hw *hw;
104
105 if (dev && dev->of_node) {
106 hw = of_clk_get_hw(dev->of_node, 0, con_id);
107 if (!IS_ERR(hw) || PTR_ERR(hw) == -EPROBE_DEFER)
108 return clk_hw_create_clk(dev, hw, dev_id, con_id);
109 }
110
111 return __clk_get_sys(dev, dev_id, con_id);
112 }
113 EXPORT_SYMBOL(clk_get);
114
115 void clk_put(struct clk *clk)
116 {
117 __clk_put(clk);
118 }
119 EXPORT_SYMBOL(clk_put);
120
121 static void __clkdev_add(struct clk_lookup *cl)
122 {
123 mutex_lock(&clocks_mutex);
124 list_add_tail(&cl->node, &clocks);
125 mutex_unlock(&clocks_mutex);
126 }
127
128 void clkdev_add(struct clk_lookup *cl)
129 {
130 if (!cl->clk_hw)
131 cl->clk_hw = __clk_get_hw(cl->clk);
132 __clkdev_add(cl);
133 }
134 EXPORT_SYMBOL(clkdev_add);
135
136 void clkdev_add_table(struct clk_lookup *cl, size_t num)
137 {
138 mutex_lock(&clocks_mutex);
139 while (num--) {
140 cl->clk_hw = __clk_get_hw(cl->clk);
141 list_add_tail(&cl->node, &clocks);
142 cl++;
143 }
144 mutex_unlock(&clocks_mutex);
145 }
146
147 #define MAX_DEV_ID 20
148 #define MAX_CON_ID 16
149
150 struct clk_lookup_alloc {
151 struct clk_lookup cl;
152 char dev_id[MAX_DEV_ID];
153 char con_id[MAX_CON_ID];
154 };
155
156 static struct clk_lookup * __ref
157 vclkdev_alloc(struct clk_hw *hw, const char *con_id, const char *dev_fmt,
158 va_list ap)
159 {
160 struct clk_lookup_alloc *cla;
161
162 cla = kzalloc(sizeof(*cla), GFP_KERNEL);
163 if (!cla)
164 return NULL;
165
166 cla->cl.clk_hw = hw;
167 if (con_id) {
168 strlcpy(cla->con_id, con_id, sizeof(cla->con_id));
169 cla->cl.con_id = cla->con_id;
170 }
171
172 if (dev_fmt) {
173 vscnprintf(cla->dev_id, sizeof(cla->dev_id), dev_fmt, ap);
174 cla->cl.dev_id = cla->dev_id;
175 }
176
177 return &cla->cl;
178 }
179
180 static struct clk_lookup *
181 vclkdev_create(struct clk_hw *hw, const char *con_id, const char *dev_fmt,
182 va_list ap)
183 {
184 struct clk_lookup *cl;
185
186 cl = vclkdev_alloc(hw, con_id, dev_fmt, ap);
187 if (cl)
188 __clkdev_add(cl);
189
190 return cl;
191 }
192
193 struct clk_lookup * __ref
194 clkdev_alloc(struct clk *clk, const char *con_id, const char *dev_fmt, ...)
195 {
196 struct clk_lookup *cl;
197 va_list ap;
198
199 va_start(ap, dev_fmt);
200 cl = vclkdev_alloc(__clk_get_hw(clk), con_id, dev_fmt, ap);
201 va_end(ap);
202
203 return cl;
204 }
205 EXPORT_SYMBOL(clkdev_alloc);
206
207 struct clk_lookup *
208 clkdev_hw_alloc(struct clk_hw *hw, const char *con_id, const char *dev_fmt, ...)
209 {
210 struct clk_lookup *cl;
211 va_list ap;
212
213 va_start(ap, dev_fmt);
214 cl = vclkdev_alloc(hw, con_id, dev_fmt, ap);
215 va_end(ap);
216
217 return cl;
218 }
219 EXPORT_SYMBOL(clkdev_hw_alloc);
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230 struct clk_lookup *clkdev_create(struct clk *clk, const char *con_id,
231 const char *dev_fmt, ...)
232 {
233 struct clk_lookup *cl;
234 va_list ap;
235
236 va_start(ap, dev_fmt);
237 cl = vclkdev_create(__clk_get_hw(clk), con_id, dev_fmt, ap);
238 va_end(ap);
239
240 return cl;
241 }
242 EXPORT_SYMBOL_GPL(clkdev_create);
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253 struct clk_lookup *clkdev_hw_create(struct clk_hw *hw, const char *con_id,
254 const char *dev_fmt, ...)
255 {
256 struct clk_lookup *cl;
257 va_list ap;
258
259 va_start(ap, dev_fmt);
260 cl = vclkdev_create(hw, con_id, dev_fmt, ap);
261 va_end(ap);
262
263 return cl;
264 }
265 EXPORT_SYMBOL_GPL(clkdev_hw_create);
266
267 int clk_add_alias(const char *alias, const char *alias_dev_name,
268 const char *con_id, struct device *dev)
269 {
270 struct clk *r = clk_get(dev, con_id);
271 struct clk_lookup *l;
272
273 if (IS_ERR(r))
274 return PTR_ERR(r);
275
276 l = clkdev_create(r, alias, alias_dev_name ? "%s" : NULL,
277 alias_dev_name);
278 clk_put(r);
279
280 return l ? 0 : -ENODEV;
281 }
282 EXPORT_SYMBOL(clk_add_alias);
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286
287 void clkdev_drop(struct clk_lookup *cl)
288 {
289 mutex_lock(&clocks_mutex);
290 list_del(&cl->node);
291 mutex_unlock(&clocks_mutex);
292 kfree(cl);
293 }
294 EXPORT_SYMBOL(clkdev_drop);
295
296 static struct clk_lookup *__clk_register_clkdev(struct clk_hw *hw,
297 const char *con_id,
298 const char *dev_id, ...)
299 {
300 struct clk_lookup *cl;
301 va_list ap;
302
303 va_start(ap, dev_id);
304 cl = vclkdev_create(hw, con_id, dev_id, ap);
305 va_end(ap);
306
307 return cl;
308 }
309
310 static int do_clk_register_clkdev(struct clk_hw *hw,
311 struct clk_lookup **cl, const char *con_id, const char *dev_id)
312 {
313 if (IS_ERR(hw))
314 return PTR_ERR(hw);
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318
319 if (dev_id)
320 *cl = __clk_register_clkdev(hw, con_id, "%s", dev_id);
321 else
322 *cl = __clk_register_clkdev(hw, con_id, NULL);
323
324 return *cl ? 0 : -ENOMEM;
325 }
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341 int clk_register_clkdev(struct clk *clk, const char *con_id,
342 const char *dev_id)
343 {
344 struct clk_lookup *cl;
345
346 if (IS_ERR(clk))
347 return PTR_ERR(clk);
348
349 return do_clk_register_clkdev(__clk_get_hw(clk), &cl, con_id,
350 dev_id);
351 }
352 EXPORT_SYMBOL(clk_register_clkdev);
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368 int clk_hw_register_clkdev(struct clk_hw *hw, const char *con_id,
369 const char *dev_id)
370 {
371 struct clk_lookup *cl;
372
373 return do_clk_register_clkdev(hw, &cl, con_id, dev_id);
374 }
375 EXPORT_SYMBOL(clk_hw_register_clkdev);
376
377 static void devm_clkdev_release(struct device *dev, void *res)
378 {
379 clkdev_drop(*(struct clk_lookup **)res);
380 }
381
382 static int devm_clk_match_clkdev(struct device *dev, void *res, void *data)
383 {
384 struct clk_lookup **l = res;
385
386 return *l == data;
387 }
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399 void devm_clk_release_clkdev(struct device *dev, const char *con_id,
400 const char *dev_id)
401 {
402 struct clk_lookup *cl;
403 int rval;
404
405 mutex_lock(&clocks_mutex);
406 cl = clk_find(dev_id, con_id);
407 mutex_unlock(&clocks_mutex);
408
409 WARN_ON(!cl);
410 rval = devres_release(dev, devm_clkdev_release,
411 devm_clk_match_clkdev, cl);
412 WARN_ON(rval);
413 }
414 EXPORT_SYMBOL(devm_clk_release_clkdev);
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431 int devm_clk_hw_register_clkdev(struct device *dev, struct clk_hw *hw,
432 const char *con_id, const char *dev_id)
433 {
434 int rval = -ENOMEM;
435 struct clk_lookup **cl;
436
437 cl = devres_alloc(devm_clkdev_release, sizeof(*cl), GFP_KERNEL);
438 if (cl) {
439 rval = do_clk_register_clkdev(hw, cl, con_id, dev_id);
440 if (!rval)
441 devres_add(dev, cl);
442 else
443 devres_free(cl);
444 }
445 return rval;
446 }
447 EXPORT_SYMBOL(devm_clk_hw_register_clkdev);