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Merge tag 'signed-efi-next' of git://github.com/agraf/u-boot
[u-boot] / drivers / clk / clk-uclass.c
1 /*
2  * Copyright (C) 2015 Google, Inc
3  * Written by Simon Glass <sjg@chromium.org>
4  * Copyright (c) 2016, NVIDIA CORPORATION.
5  * Copyright (c) 2018, Theobroma Systems Design und Consulting GmbH
6  *
7  * SPDX-License-Identifier:     GPL-2.0+
8  */
9
10 #include <common.h>
11 #include <clk.h>
12 #include <clk-uclass.h>
13 #include <dm.h>
14 #include <dm/read.h>
15 #include <dt-structs.h>
16 #include <errno.h>
17
18 static inline const struct clk_ops *clk_dev_ops(struct udevice *dev)
19 {
20         return (const struct clk_ops *)dev->driver->ops;
21 }
22
23 #if CONFIG_IS_ENABLED(OF_CONTROL)
24 # if CONFIG_IS_ENABLED(OF_PLATDATA)
25 int clk_get_by_index_platdata(struct udevice *dev, int index,
26                               struct phandle_1_arg *cells, struct clk *clk)
27 {
28         int ret;
29
30         if (index != 0)
31                 return -ENOSYS;
32         ret = uclass_get_device(UCLASS_CLK, 0, &clk->dev);
33         if (ret)
34                 return ret;
35         clk->id = cells[0].arg[0];
36
37         return 0;
38 }
39 # else
40 static int clk_of_xlate_default(struct clk *clk,
41                                 struct ofnode_phandle_args *args)
42 {
43         debug("%s(clk=%p)\n", __func__, clk);
44
45         if (args->args_count > 1) {
46                 debug("Invaild args_count: %d\n", args->args_count);
47                 return -EINVAL;
48         }
49
50         if (args->args_count)
51                 clk->id = args->args[0];
52         else
53                 clk->id = 0;
54
55         return 0;
56 }
57
58 static int clk_get_by_indexed_prop(struct udevice *dev, const char *prop_name,
59                                    int index, struct clk *clk)
60 {
61         int ret;
62         struct ofnode_phandle_args args;
63         struct udevice *dev_clk;
64         const struct clk_ops *ops;
65
66         debug("%s(dev=%p, index=%d, clk=%p)\n", __func__, dev, index, clk);
67
68         assert(clk);
69         clk->dev = NULL;
70
71         ret = dev_read_phandle_with_args(dev, prop_name, "#clock-cells", 0,
72                                          index, &args);
73         if (ret) {
74                 debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n",
75                       __func__, ret);
76                 return ret;
77         }
78
79         ret = uclass_get_device_by_ofnode(UCLASS_CLK, args.node, &dev_clk);
80         if (ret) {
81                 debug("%s: uclass_get_device_by_of_offset failed: err=%d\n",
82                       __func__, ret);
83                 return ret;
84         }
85
86         clk->dev = dev_clk;
87
88         ops = clk_dev_ops(dev_clk);
89
90         if (ops->of_xlate)
91                 ret = ops->of_xlate(clk, &args);
92         else
93                 ret = clk_of_xlate_default(clk, &args);
94         if (ret) {
95                 debug("of_xlate() failed: %d\n", ret);
96                 return ret;
97         }
98
99         return clk_request(dev_clk, clk);
100 }
101
102 int clk_get_by_index(struct udevice *dev, int index, struct clk *clk)
103 {
104         return clk_get_by_indexed_prop(dev, "clocks", index, clk);
105 }
106
107 static int clk_set_default_parents(struct udevice *dev)
108 {
109         struct clk clk, parent_clk;
110         int index;
111         int num_parents;
112         int ret;
113
114         num_parents = dev_count_phandle_with_args(dev, "assigned-clock-parents",
115                                                   "#clock-cells");
116         if (num_parents < 0) {
117                 debug("%s: could not read assigned-clock-parents for %p\n",
118                       __func__, dev);
119                 return 0;
120         }
121
122         for (index = 0; index < num_parents; index++) {
123                 ret = clk_get_by_indexed_prop(dev, "assigned-clock-parents",
124                                               index, &parent_clk);
125                 if (ret) {
126                         debug("%s: could not get parent clock %d for %s\n",
127                               __func__, index, dev_read_name(dev));
128                         return ret;
129                 }
130
131                 ret = clk_get_by_indexed_prop(dev, "assigned-clocks",
132                                               index, &clk);
133                 if (ret) {
134                         debug("%s: could not get assigned clock %d for %s\n",
135                               __func__, index, dev_read_name(dev));
136                         return ret;
137                 }
138
139                 ret = clk_set_parent(&clk, &parent_clk);
140
141                 /*
142                  * Not all drivers may support clock-reparenting (as of now).
143                  * Ignore errors due to this.
144                  */
145                 if (ret == -ENOSYS)
146                         continue;
147
148                 if (ret) {
149                         debug("%s: failed to reparent clock %d for %s\n",
150                               __func__, index, dev_read_name(dev));
151                         return ret;
152                 }
153         }
154
155         return 0;
156 }
157
158 static int clk_set_default_rates(struct udevice *dev)
159 {
160         struct clk clk;
161         int index;
162         int num_rates;
163         int size;
164         int ret = 0;
165         u32 *rates = NULL;
166
167         size = dev_read_size(dev, "assigned-clock-rates");
168         if (size < 0)
169                 return 0;
170
171         num_rates = size / sizeof(u32);
172         rates = calloc(num_rates, sizeof(u32));
173         if (!rates)
174                 return -ENOMEM;
175
176         ret = dev_read_u32_array(dev, "assigned-clock-rates", rates, num_rates);
177         if (ret)
178                 goto fail;
179
180         for (index = 0; index < num_rates; index++) {
181                 ret = clk_get_by_indexed_prop(dev, "assigned-clocks",
182                                               index, &clk);
183                 if (ret) {
184                         debug("%s: could not get assigned clock %d for %s\n",
185                               __func__, index, dev_read_name(dev));
186                         continue;
187                 }
188
189                 ret = clk_set_rate(&clk, rates[index]);
190                 if (ret < 0) {
191                         debug("%s: failed to set rate on clock %d for %s\n",
192                               __func__, index, dev_read_name(dev));
193                         break;
194                 }
195         }
196
197 fail:
198         free(rates);
199         return ret;
200 }
201
202 int clk_set_defaults(struct udevice *dev)
203 {
204         int ret;
205
206         /* If this is running pre-reloc state, don't take any action. */
207         if (!(gd->flags & GD_FLG_RELOC))
208                 return 0;
209
210         debug("%s(%s)\n", __func__, dev_read_name(dev));
211
212         ret = clk_set_default_parents(dev);
213         if (ret)
214                 return ret;
215
216         ret = clk_set_default_rates(dev);
217         if (ret < 0)
218                 return ret;
219
220         return 0;
221 }
222 # endif /* OF_PLATDATA */
223
224 int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk)
225 {
226         int index;
227
228         debug("%s(dev=%p, name=%s, clk=%p)\n", __func__, dev, name, clk);
229         clk->dev = NULL;
230
231         index = dev_read_stringlist_search(dev, "clock-names", name);
232         if (index < 0) {
233                 debug("fdt_stringlist_search() failed: %d\n", index);
234                 return index;
235         }
236
237         return clk_get_by_index(dev, index, clk);
238 }
239
240 int clk_release_all(struct clk *clk, int count)
241 {
242         int i, ret;
243
244         for (i = 0; i < count; i++) {
245                 debug("%s(clk[%d]=%p)\n", __func__, i, &clk[i]);
246
247                 /* check if clock has been previously requested */
248                 if (!clk[i].dev)
249                         continue;
250
251                 ret = clk_disable(&clk[i]);
252                 if (ret && ret != -ENOSYS)
253                         return ret;
254
255                 ret = clk_free(&clk[i]);
256                 if (ret && ret != -ENOSYS)
257                         return ret;
258         }
259
260         return 0;
261 }
262
263 #endif /* OF_CONTROL */
264
265 int clk_request(struct udevice *dev, struct clk *clk)
266 {
267         const struct clk_ops *ops = clk_dev_ops(dev);
268
269         debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk);
270
271         clk->dev = dev;
272
273         if (!ops->request)
274                 return 0;
275
276         return ops->request(clk);
277 }
278
279 int clk_free(struct clk *clk)
280 {
281         const struct clk_ops *ops = clk_dev_ops(clk->dev);
282
283         debug("%s(clk=%p)\n", __func__, clk);
284
285         if (!ops->free)
286                 return 0;
287
288         return ops->free(clk);
289 }
290
291 ulong clk_get_rate(struct clk *clk)
292 {
293         const struct clk_ops *ops = clk_dev_ops(clk->dev);
294
295         debug("%s(clk=%p)\n", __func__, clk);
296
297         if (!ops->get_rate)
298                 return -ENOSYS;
299
300         return ops->get_rate(clk);
301 }
302
303 ulong clk_set_rate(struct clk *clk, ulong rate)
304 {
305         const struct clk_ops *ops = clk_dev_ops(clk->dev);
306
307         debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
308
309         if (!ops->set_rate)
310                 return -ENOSYS;
311
312         return ops->set_rate(clk, rate);
313 }
314
315 int clk_set_parent(struct clk *clk, struct clk *parent)
316 {
317         const struct clk_ops *ops = clk_dev_ops(clk->dev);
318
319         debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent);
320
321         if (!ops->set_parent)
322                 return -ENOSYS;
323
324         return ops->set_parent(clk, parent);
325 }
326
327 int clk_enable(struct clk *clk)
328 {
329         const struct clk_ops *ops = clk_dev_ops(clk->dev);
330
331         debug("%s(clk=%p)\n", __func__, clk);
332
333         if (!ops->enable)
334                 return -ENOSYS;
335
336         return ops->enable(clk);
337 }
338
339 int clk_disable(struct clk *clk)
340 {
341         const struct clk_ops *ops = clk_dev_ops(clk->dev);
342
343         debug("%s(clk=%p)\n", __func__, clk);
344
345         if (!ops->disable)
346                 return -ENOSYS;
347
348         return ops->disable(clk);
349 }
350
351 UCLASS_DRIVER(clk) = {
352         .id             = UCLASS_CLK,
353         .name           = "clk",
354 };