1
2
3
4
5
6#define LOG_CATEGORY UCLASS_RESET
7
8#include <common.h>
9#include <dm.h>
10#include <fdtdec.h>
11#include <log.h>
12#include <malloc.h>
13#include <reset.h>
14#include <reset-uclass.h>
15#include <dm/devres.h>
16#include <dm/lists.h>
17
18static inline struct reset_ops *reset_dev_ops(struct udevice *dev)
19{
20 return (struct reset_ops *)dev->driver->ops;
21}
22
23static int reset_of_xlate_default(struct reset_ctl *reset_ctl,
24 struct ofnode_phandle_args *args)
25{
26 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
27
28 if (args->args_count != 1) {
29 debug("Invalid args_count: %d\n", args->args_count);
30 return -EINVAL;
31 }
32
33 reset_ctl->id = args->args[0];
34
35 return 0;
36}
37
38static int reset_get_by_index_tail(int ret, ofnode node,
39 struct ofnode_phandle_args *args,
40 const char *list_name, int index,
41 struct reset_ctl *reset_ctl)
42{
43 struct udevice *dev_reset;
44 struct reset_ops *ops;
45
46 assert(reset_ctl);
47 reset_ctl->dev = NULL;
48 if (ret)
49 return ret;
50
51 ret = uclass_get_device_by_ofnode(UCLASS_RESET, args->node,
52 &dev_reset);
53 if (ret) {
54 debug("%s: uclass_get_device_by_ofnode() failed: %d\n",
55 __func__, ret);
56 debug("%s %d\n", ofnode_get_name(args->node), args->args[0]);
57 return ret;
58 }
59 ops = reset_dev_ops(dev_reset);
60
61 reset_ctl->dev = dev_reset;
62 if (ops->of_xlate)
63 ret = ops->of_xlate(reset_ctl, args);
64 else
65 ret = reset_of_xlate_default(reset_ctl, args);
66 if (ret) {
67 debug("of_xlate() failed: %d\n", ret);
68 return ret;
69 }
70
71 ret = ops->request ? ops->request(reset_ctl) : 0;
72 if (ret) {
73 debug("ops->request() failed: %d\n", ret);
74 return ret;
75 }
76
77 return 0;
78}
79
80int reset_get_by_index(struct udevice *dev, int index,
81 struct reset_ctl *reset_ctl)
82{
83 struct ofnode_phandle_args args;
84 int ret;
85
86 ret = dev_read_phandle_with_args(dev, "resets", "#reset-cells", 0,
87 index, &args);
88
89 return reset_get_by_index_tail(ret, dev_ofnode(dev), &args, "resets",
90 index > 0, reset_ctl);
91}
92
93int reset_get_by_index_nodev(ofnode node, int index,
94 struct reset_ctl *reset_ctl)
95{
96 struct ofnode_phandle_args args;
97 int ret;
98
99 ret = ofnode_parse_phandle_with_args(node, "resets", "#reset-cells", 0,
100 index, &args);
101
102 return reset_get_by_index_tail(ret, node, &args, "resets",
103 index > 0, reset_ctl);
104}
105
106static int __reset_get_bulk(struct udevice *dev, ofnode node,
107 struct reset_ctl_bulk *bulk)
108{
109 int i, ret, err, count;
110
111 bulk->count = 0;
112
113 count = ofnode_count_phandle_with_args(node, "resets", "#reset-cells",
114 0);
115 if (count < 1)
116 return count;
117
118 bulk->resets = devm_kcalloc(dev, count, sizeof(struct reset_ctl),
119 GFP_KERNEL);
120 if (!bulk->resets)
121 return -ENOMEM;
122
123 for (i = 0; i < count; i++) {
124 ret = reset_get_by_index_nodev(node, i, &bulk->resets[i]);
125 if (ret < 0)
126 goto bulk_get_err;
127
128 ++bulk->count;
129 }
130
131 return 0;
132
133bulk_get_err:
134 err = reset_release_all(bulk->resets, bulk->count);
135 if (err)
136 debug("%s: could release all resets for %p\n",
137 __func__, dev);
138
139 return ret;
140}
141
142int reset_get_bulk(struct udevice *dev, struct reset_ctl_bulk *bulk)
143{
144 return __reset_get_bulk(dev, dev_ofnode(dev), bulk);
145}
146
147int reset_get_by_name(struct udevice *dev, const char *name,
148 struct reset_ctl *reset_ctl)
149{
150 int index;
151
152 debug("%s(dev=%p, name=%s, reset_ctl=%p)\n", __func__, dev, name,
153 reset_ctl);
154 reset_ctl->dev = NULL;
155
156 index = dev_read_stringlist_search(dev, "reset-names", name);
157 if (index < 0) {
158 debug("fdt_stringlist_search() failed: %d\n", index);
159 return index;
160 }
161
162 return reset_get_by_index(dev, index, reset_ctl);
163}
164
165int reset_request(struct reset_ctl *reset_ctl)
166{
167 struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
168
169 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
170
171 return ops->request ? ops->request(reset_ctl) : 0;
172}
173
174int reset_free(struct reset_ctl *reset_ctl)
175{
176 struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
177
178 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
179
180 return ops->rfree ? ops->rfree(reset_ctl) : 0;
181}
182
183int reset_assert(struct reset_ctl *reset_ctl)
184{
185 struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
186
187 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
188
189 return ops->rst_assert ? ops->rst_assert(reset_ctl) : 0;
190}
191
192int reset_assert_bulk(struct reset_ctl_bulk *bulk)
193{
194 int i, ret;
195
196 for (i = 0; i < bulk->count; i++) {
197 ret = reset_assert(&bulk->resets[i]);
198 if (ret < 0)
199 return ret;
200 }
201
202 return 0;
203}
204
205int reset_deassert(struct reset_ctl *reset_ctl)
206{
207 struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
208
209 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
210
211 return ops->rst_deassert ? ops->rst_deassert(reset_ctl) : 0;
212}
213
214int reset_deassert_bulk(struct reset_ctl_bulk *bulk)
215{
216 int i, ret;
217
218 for (i = 0; i < bulk->count; i++) {
219 ret = reset_deassert(&bulk->resets[i]);
220 if (ret < 0)
221 return ret;
222 }
223
224 return 0;
225}
226
227int reset_status(struct reset_ctl *reset_ctl)
228{
229 struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
230
231 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
232
233 return ops->rst_status ? ops->rst_status(reset_ctl) : 0;
234}
235
236int reset_release_all(struct reset_ctl *reset_ctl, int count)
237{
238 int i, ret;
239
240 for (i = 0; i < count; i++) {
241 debug("%s(reset_ctl[%d]=%p)\n", __func__, i, &reset_ctl[i]);
242
243
244 if (!reset_ctl[i].dev)
245 continue;
246
247 ret = reset_assert(&reset_ctl[i]);
248 if (ret)
249 return ret;
250
251 ret = reset_free(&reset_ctl[i]);
252 if (ret)
253 return ret;
254 }
255
256 return 0;
257}
258
259static void devm_reset_release(struct udevice *dev, void *res)
260{
261 reset_free(res);
262}
263
264struct reset_ctl *devm_reset_control_get_by_index(struct udevice *dev,
265 int index)
266{
267 int rc;
268 struct reset_ctl *reset_ctl;
269
270 reset_ctl = devres_alloc(devm_reset_release, sizeof(struct reset_ctl),
271 __GFP_ZERO);
272 if (unlikely(!reset_ctl))
273 return ERR_PTR(-ENOMEM);
274
275 rc = reset_get_by_index(dev, index, reset_ctl);
276 if (rc)
277 return ERR_PTR(rc);
278
279 devres_add(dev, reset_ctl);
280 return reset_ctl;
281}
282
283struct reset_ctl *devm_reset_control_get(struct udevice *dev, const char *id)
284{
285 int rc;
286 struct reset_ctl *reset_ctl;
287
288 reset_ctl = devres_alloc(devm_reset_release, sizeof(struct reset_ctl),
289 __GFP_ZERO);
290 if (unlikely(!reset_ctl))
291 return ERR_PTR(-ENOMEM);
292
293 rc = reset_get_by_name(dev, id, reset_ctl);
294 if (rc)
295 return ERR_PTR(rc);
296
297 devres_add(dev, reset_ctl);
298 return reset_ctl;
299}
300
301struct reset_ctl *devm_reset_control_get_optional(struct udevice *dev,
302 const char *id)
303{
304 struct reset_ctl *r = devm_reset_control_get(dev, id);
305
306 if (IS_ERR(r))
307 return NULL;
308
309 return r;
310}
311
312static void devm_reset_bulk_release(struct udevice *dev, void *res)
313{
314 struct reset_ctl_bulk *bulk = res;
315
316 reset_release_all(bulk->resets, bulk->count);
317}
318
319struct reset_ctl_bulk *devm_reset_bulk_get_by_node(struct udevice *dev,
320 ofnode node)
321{
322 int rc;
323 struct reset_ctl_bulk *bulk;
324
325 bulk = devres_alloc(devm_reset_bulk_release,
326 sizeof(struct reset_ctl_bulk),
327 __GFP_ZERO);
328
329
330 if (unlikely(!bulk))
331 return ERR_PTR(-ENOMEM);
332
333 rc = __reset_get_bulk(dev, node, bulk);
334 if (rc)
335 return ERR_PTR(rc);
336
337 devres_add(dev, bulk);
338 return bulk;
339}
340
341struct reset_ctl_bulk *devm_reset_bulk_get_optional_by_node(struct udevice *dev,
342 ofnode node)
343{
344 struct reset_ctl_bulk *bulk;
345
346 bulk = devm_reset_bulk_get_by_node(dev, node);
347
348 if (IS_ERR(bulk))
349 return NULL;
350
351 return bulk;
352}
353
354struct reset_ctl_bulk *devm_reset_bulk_get(struct udevice *dev)
355{
356 return devm_reset_bulk_get_by_node(dev, dev_ofnode(dev));
357}
358
359struct reset_ctl_bulk *devm_reset_bulk_get_optional(struct udevice *dev)
360{
361 return devm_reset_bulk_get_optional_by_node(dev, dev_ofnode(dev));
362}
363
364UCLASS_DRIVER(reset) = {
365 .id = UCLASS_RESET,
366 .name = "reset",
367};
368
