Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
0318e693 | 2 | /* |
6d803ba7 | 3 | * drivers/clk/clkdev.c |
0318e693 RK |
4 | * |
5 | * Copyright (C) 2008 Russell King. | |
6 | * | |
0318e693 RK |
7 | * Helper for the clk API to assist looking up a struct clk. |
8 | */ | |
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> | |
c0c60c4b | 17 | #include <linux/clk.h> |
6d803ba7 | 18 | #include <linux/clkdev.h> |
035a61c3 | 19 | #include <linux/clk-provider.h> |
766e6a4e | 20 | #include <linux/of.h> |
0318e693 | 21 | |
3a3d2b05 SN |
22 | #include "clk.h" |
23 | ||
0318e693 RK |
24 | static LIST_HEAD(clocks); |
25 | static DEFINE_MUTEX(clocks_mutex); | |
26 | ||
409dc360 RK |
27 | /* |
28 | * Find the correct struct clk for the device and connection ID. | |
29 | * We do slightly fuzzy matching here: | |
30 | * An entry with a NULL ID is assumed to be a wildcard. | |
31 | * If an entry has a device ID, it must match | |
32 | * If an entry has a connection ID, it must match | |
33 | * Then we take the most specific entry - with the following | |
659431fc | 34 | * order of precedence: dev+con > dev only > con only. |
409dc360 | 35 | */ |
e8bf8df9 | 36 | static struct clk_lookup *clk_find(const char *dev_id, const char *con_id) |
0318e693 | 37 | { |
e8bf8df9 | 38 | struct clk_lookup *p, *cl = NULL; |
67b50871 | 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; | |
0318e693 | 45 | |
5a7efdac SB |
46 | lockdep_assert_held(&clocks_mutex); |
47 | ||
0318e693 | 48 | list_for_each_entry(p, &clocks, node) { |
0318e693 | 49 | match = 0; |
409dc360 RK |
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 | } | |
0318e693 | 60 | |
67b50871 | 61 | if (match > best_found) { |
e8bf8df9 | 62 | cl = p; |
67b50871 | 63 | if (match != best_possible) |
64 | best_found = match; | |
e4bf5bec | 65 | else |
66 | break; | |
0318e693 RK |
67 | } |
68 | } | |
e8bf8df9 | 69 | return cl; |
0318e693 RK |
70 | } |
71 | ||
dde4eff4 | 72 | struct clk_hw *clk_find_hw(const char *dev_id, const char *con_id) |
0318e693 | 73 | { |
e8bf8df9 | 74 | struct clk_lookup *cl; |
d1011cba | 75 | struct clk_hw *hw = ERR_PTR(-ENOENT); |
0318e693 RK |
76 | |
77 | mutex_lock(&clocks_mutex); | |
e8bf8df9 | 78 | cl = clk_find(dev_id, con_id); |
d1011cba SB |
79 | if (cl) |
80 | hw = cl->clk_hw; | |
0318e693 RK |
81 | mutex_unlock(&clocks_mutex); |
82 | ||
d1011cba SB |
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); | |
0318e693 | 92 | } |
efa85048 SB |
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 | } | |
05fd8e73 SH |
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; | |
4472287a | 103 | struct clk_hw *hw; |
766e6a4e | 104 | |
53ccb22b | 105 | if (dev && dev->of_node) { |
4472287a SB |
106 | hw = of_clk_get_hw(dev->of_node, 0, con_id); |
107 | if (!IS_ERR(hw) || PTR_ERR(hw) == -EPROBE_DEFER) | |
efa85048 | 108 | return clk_hw_create_clk(dev, hw, dev_id, con_id); |
766e6a4e | 109 | } |
05fd8e73 | 110 | |
efa85048 | 111 | return __clk_get_sys(dev, dev_id, con_id); |
05fd8e73 | 112 | } |
0318e693 RK |
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 | ||
d5622a9c | 121 | static void __clkdev_add(struct clk_lookup *cl) |
0318e693 RK |
122 | { |
123 | mutex_lock(&clocks_mutex); | |
124 | list_add_tail(&cl->node, &clocks); | |
125 | mutex_unlock(&clocks_mutex); | |
126 | } | |
d5622a9c RK |
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 | } | |
0318e693 RK |
134 | EXPORT_SYMBOL(clkdev_add); |
135 | ||
fba3acd9 | 136 | void clkdev_add_table(struct clk_lookup *cl, size_t num) |
0a0300dc RK |
137 | { |
138 | mutex_lock(&clocks_mutex); | |
139 | while (num--) { | |
d5622a9c | 140 | cl->clk_hw = __clk_get_hw(cl->clk); |
0a0300dc RK |
141 | list_add_tail(&cl->node, &clocks); |
142 | cl++; | |
143 | } | |
144 | mutex_unlock(&clocks_mutex); | |
145 | } | |
146 | ||
0318e693 RK |
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 | ||
bd721ea7 | 156 | static struct clk_lookup * __ref |
d5622a9c | 157 | vclkdev_alloc(struct clk_hw *hw, const char *con_id, const char *dev_fmt, |
e9d7f406 | 158 | va_list ap) |
0318e693 RK |
159 | { |
160 | struct clk_lookup_alloc *cla; | |
161 | ||
0d4e3d00 | 162 | cla = kzalloc(sizeof(*cla), GFP_KERNEL); |
0318e693 RK |
163 | if (!cla) |
164 | return NULL; | |
165 | ||
d5622a9c | 166 | cla->cl.clk_hw = hw; |
0318e693 | 167 | if (con_id) { |
c19edff6 | 168 | strscpy(cla->con_id, con_id, sizeof(cla->con_id)); |
0318e693 RK |
169 | cla->cl.con_id = cla->con_id; |
170 | } | |
171 | ||
172 | if (dev_fmt) { | |
0318e693 RK |
173 | vscnprintf(cla->dev_id, sizeof(cla->dev_id), dev_fmt, ap); |
174 | cla->cl.dev_id = cla->dev_id; | |
0318e693 RK |
175 | } |
176 | ||
177 | return &cla->cl; | |
178 | } | |
e9d7f406 | 179 | |
25689998 RK |
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 | ||
25689998 RK |
193 | /** |
194 | * clkdev_create - allocate and add a clkdev lookup structure | |
195 | * @clk: struct clk to associate with all clk_lookups | |
196 | * @con_id: connection ID string on device | |
197 | * @dev_fmt: format string describing device name | |
198 | * | |
199 | * Returns a clk_lookup structure, which can be later unregistered and | |
200 | * freed. | |
201 | */ | |
202 | struct clk_lookup *clkdev_create(struct clk *clk, const char *con_id, | |
203 | const char *dev_fmt, ...) | |
204 | { | |
205 | struct clk_lookup *cl; | |
206 | va_list ap; | |
207 | ||
208 | va_start(ap, dev_fmt); | |
209 | cl = vclkdev_create(__clk_get_hw(clk), con_id, dev_fmt, ap); | |
210 | va_end(ap); | |
211 | ||
212 | return cl; | |
213 | } | |
214 | EXPORT_SYMBOL_GPL(clkdev_create); | |
215 | ||
e4f1b49b SB |
216 | /** |
217 | * clkdev_hw_create - allocate and add a clkdev lookup structure | |
218 | * @hw: struct clk_hw to associate with all clk_lookups | |
219 | * @con_id: connection ID string on device | |
220 | * @dev_fmt: format string describing device name | |
221 | * | |
222 | * Returns a clk_lookup structure, which can be later unregistered and | |
223 | * freed. | |
224 | */ | |
225 | struct clk_lookup *clkdev_hw_create(struct clk_hw *hw, const char *con_id, | |
226 | const char *dev_fmt, ...) | |
227 | { | |
228 | struct clk_lookup *cl; | |
229 | va_list ap; | |
230 | ||
231 | va_start(ap, dev_fmt); | |
232 | cl = vclkdev_create(hw, con_id, dev_fmt, ap); | |
233 | va_end(ap); | |
234 | ||
235 | return cl; | |
236 | } | |
237 | EXPORT_SYMBOL_GPL(clkdev_hw_create); | |
238 | ||
b3d8d7e8 RK |
239 | int clk_add_alias(const char *alias, const char *alias_dev_name, |
240 | const char *con_id, struct device *dev) | |
c0683039 | 241 | { |
b3d8d7e8 | 242 | struct clk *r = clk_get(dev, con_id); |
c0683039 TL |
243 | struct clk_lookup *l; |
244 | ||
245 | if (IS_ERR(r)) | |
246 | return PTR_ERR(r); | |
247 | ||
625faa6a RK |
248 | l = clkdev_create(r, alias, alias_dev_name ? "%s" : NULL, |
249 | alias_dev_name); | |
c0683039 | 250 | clk_put(r); |
25689998 RK |
251 | |
252 | return l ? 0 : -ENODEV; | |
c0683039 TL |
253 | } |
254 | EXPORT_SYMBOL(clk_add_alias); | |
255 | ||
0318e693 RK |
256 | /* |
257 | * clkdev_drop - remove a clock dynamically allocated | |
258 | */ | |
259 | void clkdev_drop(struct clk_lookup *cl) | |
260 | { | |
261 | mutex_lock(&clocks_mutex); | |
262 | list_del(&cl->node); | |
263 | mutex_unlock(&clocks_mutex); | |
264 | kfree(cl); | |
265 | } | |
266 | EXPORT_SYMBOL(clkdev_drop); | |
e9d7f406 | 267 | |
416dd13a KC |
268 | static struct clk_lookup *__clk_register_clkdev(struct clk_hw *hw, |
269 | const char *con_id, | |
270 | const char *dev_id, ...) | |
271 | { | |
272 | struct clk_lookup *cl; | |
273 | va_list ap; | |
274 | ||
275 | va_start(ap, dev_id); | |
276 | cl = vclkdev_create(hw, con_id, dev_id, ap); | |
277 | va_end(ap); | |
278 | ||
279 | return cl; | |
280 | } | |
281 | ||
3eee6c7d MV |
282 | static int do_clk_register_clkdev(struct clk_hw *hw, |
283 | struct clk_lookup **cl, const char *con_id, const char *dev_id) | |
284 | { | |
285 | if (IS_ERR(hw)) | |
286 | return PTR_ERR(hw); | |
287 | /* | |
288 | * Since dev_id can be NULL, and NULL is handled specially, we must | |
289 | * pass it as either a NULL format string, or with "%s". | |
290 | */ | |
291 | if (dev_id) | |
292 | *cl = __clk_register_clkdev(hw, con_id, "%s", dev_id); | |
293 | else | |
294 | *cl = __clk_register_clkdev(hw, con_id, NULL); | |
295 | ||
296 | return *cl ? 0 : -ENOMEM; | |
297 | } | |
298 | ||
e9d7f406 RK |
299 | /** |
300 | * clk_register_clkdev - register one clock lookup for a struct clk | |
301 | * @clk: struct clk to associate with all clk_lookups | |
302 | * @con_id: connection ID string on device | |
416dd13a | 303 | * @dev_id: string describing device name |
e9d7f406 RK |
304 | * |
305 | * con_id or dev_id may be NULL as a wildcard, just as in the rest of | |
306 | * clkdev. | |
307 | * | |
308 | * To make things easier for mass registration, we detect error clks | |
309 | * from a previous clk_register() call, and return the error code for | |
310 | * those. This is to permit this function to be called immediately | |
311 | * after clk_register(). | |
312 | */ | |
313 | int clk_register_clkdev(struct clk *clk, const char *con_id, | |
416dd13a | 314 | const char *dev_id) |
e9d7f406 RK |
315 | { |
316 | struct clk_lookup *cl; | |
e9d7f406 RK |
317 | |
318 | if (IS_ERR(clk)) | |
319 | return PTR_ERR(clk); | |
320 | ||
3eee6c7d MV |
321 | return do_clk_register_clkdev(__clk_get_hw(clk), &cl, con_id, |
322 | dev_id); | |
e9d7f406 | 323 | } |
a251361a | 324 | EXPORT_SYMBOL(clk_register_clkdev); |
e4f1b49b SB |
325 | |
326 | /** | |
327 | * clk_hw_register_clkdev - register one clock lookup for a struct clk_hw | |
328 | * @hw: struct clk_hw to associate with all clk_lookups | |
329 | * @con_id: connection ID string on device | |
330 | * @dev_id: format string describing device name | |
331 | * | |
332 | * con_id or dev_id may be NULL as a wildcard, just as in the rest of | |
333 | * clkdev. | |
9388093d GU |
334 | * |
335 | * To make things easier for mass registration, we detect error clk_hws | |
336 | * from a previous clk_hw_register_*() call, and return the error code for | |
337 | * those. This is to permit this function to be called immediately | |
338 | * after clk_hw_register_*(). | |
e4f1b49b SB |
339 | */ |
340 | int clk_hw_register_clkdev(struct clk_hw *hw, const char *con_id, | |
341 | const char *dev_id) | |
342 | { | |
343 | struct clk_lookup *cl; | |
344 | ||
3eee6c7d MV |
345 | return do_clk_register_clkdev(hw, &cl, con_id, dev_id); |
346 | } | |
347 | EXPORT_SYMBOL(clk_hw_register_clkdev); | |
9388093d | 348 | |
d61876a2 | 349 | static void devm_clkdev_release(void *res) |
3eee6c7d | 350 | { |
d61876a2 | 351 | clkdev_drop(res); |
3eee6c7d | 352 | } |
e4f1b49b | 353 | |
3eee6c7d MV |
354 | /** |
355 | * devm_clk_hw_register_clkdev - managed clk lookup registration for clk_hw | |
356 | * @dev: device this lookup is bound | |
357 | * @hw: struct clk_hw to associate with all clk_lookups | |
358 | * @con_id: connection ID string on device | |
359 | * @dev_id: format string describing device name | |
360 | * | |
361 | * con_id or dev_id may be NULL as a wildcard, just as in the rest of | |
362 | * clkdev. | |
363 | * | |
364 | * To make things easier for mass registration, we detect error clk_hws | |
365 | * from a previous clk_hw_register_*() call, and return the error code for | |
366 | * those. This is to permit this function to be called immediately | |
367 | * after clk_hw_register_*(). | |
368 | */ | |
369 | int devm_clk_hw_register_clkdev(struct device *dev, struct clk_hw *hw, | |
370 | const char *con_id, const char *dev_id) | |
371 | { | |
d61876a2 AS |
372 | struct clk_lookup *cl; |
373 | int rval; | |
374 | ||
375 | rval = do_clk_register_clkdev(hw, &cl, con_id, dev_id); | |
376 | if (rval) | |
377 | return rval; | |
378 | ||
379 | return devm_add_action_or_reset(dev, devm_clkdev_release, cl); | |
3eee6c7d MV |
380 | } |
381 | EXPORT_SYMBOL(devm_clk_hw_register_clkdev); |