1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2016, NVIDIA CORPORATION.
6 #define LOG_CATEGORY UCLASS_RESET
14 #include <reset-uclass.h>
15 #include <dm/devres.h>
18 static inline struct reset_ops *reset_dev_ops(struct udevice *dev)
20 return (struct reset_ops *)dev->driver->ops;
23 static int reset_of_xlate_default(struct reset_ctl *reset_ctl,
24 struct ofnode_phandle_args *args)
26 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
28 if (args->args_count != 1) {
29 debug("Invalid args_count: %d\n", args->args_count);
33 reset_ctl->id = args->args[0];
38 static 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)
43 struct udevice *dev_reset;
44 struct reset_ops *ops;
47 reset_ctl->dev = NULL;
51 ret = uclass_get_device_by_ofnode(UCLASS_RESET, args->node,
54 debug("%s: uclass_get_device_by_ofnode() failed: %d\n",
56 debug("%s %d\n", ofnode_get_name(args->node), args->args[0]);
59 ops = reset_dev_ops(dev_reset);
61 reset_ctl->dev = dev_reset;
63 ret = ops->of_xlate(reset_ctl, args);
65 ret = reset_of_xlate_default(reset_ctl, args);
67 debug("of_xlate() failed: %d\n", ret);
71 ret = ops->request ? ops->request(reset_ctl) : 0;
73 debug("ops->request() failed: %d\n", ret);
80 int reset_get_by_index(struct udevice *dev, int index,
81 struct reset_ctl *reset_ctl)
83 struct ofnode_phandle_args args;
86 ret = dev_read_phandle_with_args(dev, "resets", "#reset-cells", 0,
89 return reset_get_by_index_tail(ret, dev_ofnode(dev), &args, "resets",
90 index > 0, reset_ctl);
93 int reset_get_by_index_nodev(ofnode node, int index,
94 struct reset_ctl *reset_ctl)
96 struct ofnode_phandle_args args;
99 ret = ofnode_parse_phandle_with_args(node, "resets", "#reset-cells", 0,
102 return reset_get_by_index_tail(ret, node, &args, "resets",
103 index > 0, reset_ctl);
106 static int __reset_get_bulk(struct udevice *dev, ofnode node,
107 struct reset_ctl_bulk *bulk)
109 int i, ret, err, count;
113 count = ofnode_count_phandle_with_args(node, "resets", "#reset-cells",
118 bulk->resets = devm_kcalloc(dev, count, sizeof(struct reset_ctl),
123 for (i = 0; i < count; i++) {
124 ret = reset_get_by_index_nodev(node, i, &bulk->resets[i]);
134 err = reset_release_all(bulk->resets, bulk->count);
136 debug("%s: could release all resets for %p\n",
142 int reset_get_bulk(struct udevice *dev, struct reset_ctl_bulk *bulk)
144 return __reset_get_bulk(dev, dev_ofnode(dev), bulk);
147 int reset_get_by_name(struct udevice *dev, const char *name,
148 struct reset_ctl *reset_ctl)
152 debug("%s(dev=%p, name=%s, reset_ctl=%p)\n", __func__, dev, name,
154 reset_ctl->dev = NULL;
156 index = dev_read_stringlist_search(dev, "reset-names", name);
158 debug("fdt_stringlist_search() failed: %d\n", index);
162 return reset_get_by_index(dev, index, reset_ctl);
165 int reset_request(struct reset_ctl *reset_ctl)
167 struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
169 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
171 return ops->request ? ops->request(reset_ctl) : 0;
174 int reset_free(struct reset_ctl *reset_ctl)
176 struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
178 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
180 return ops->rfree ? ops->rfree(reset_ctl) : 0;
183 int reset_assert(struct reset_ctl *reset_ctl)
185 struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
187 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
189 return ops->rst_assert ? ops->rst_assert(reset_ctl) : 0;
192 int reset_assert_bulk(struct reset_ctl_bulk *bulk)
196 for (i = 0; i < bulk->count; i++) {
197 ret = reset_assert(&bulk->resets[i]);
205 int reset_deassert(struct reset_ctl *reset_ctl)
207 struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
209 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
211 return ops->rst_deassert ? ops->rst_deassert(reset_ctl) : 0;
214 int reset_deassert_bulk(struct reset_ctl_bulk *bulk)
218 for (i = 0; i < bulk->count; i++) {
219 ret = reset_deassert(&bulk->resets[i]);
227 int reset_status(struct reset_ctl *reset_ctl)
229 struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
231 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
233 return ops->rst_status ? ops->rst_status(reset_ctl) : 0;
236 int reset_release_all(struct reset_ctl *reset_ctl, int count)
240 for (i = 0; i < count; i++) {
241 debug("%s(reset_ctl[%d]=%p)\n", __func__, i, &reset_ctl[i]);
243 /* check if reset has been previously requested */
244 if (!reset_ctl[i].dev)
247 ret = reset_assert(&reset_ctl[i]);
251 ret = reset_free(&reset_ctl[i]);
259 static void devm_reset_release(struct udevice *dev, void *res)
264 struct reset_ctl *devm_reset_control_get_by_index(struct udevice *dev,
268 struct reset_ctl *reset_ctl;
270 reset_ctl = devres_alloc(devm_reset_release, sizeof(struct reset_ctl),
272 if (unlikely(!reset_ctl))
273 return ERR_PTR(-ENOMEM);
275 rc = reset_get_by_index(dev, index, reset_ctl);
279 devres_add(dev, reset_ctl);
283 struct reset_ctl *devm_reset_control_get(struct udevice *dev, const char *id)
286 struct reset_ctl *reset_ctl;
288 reset_ctl = devres_alloc(devm_reset_release, sizeof(struct reset_ctl),
290 if (unlikely(!reset_ctl))
291 return ERR_PTR(-ENOMEM);
293 rc = reset_get_by_name(dev, id, reset_ctl);
297 devres_add(dev, reset_ctl);
301 struct reset_ctl *devm_reset_control_get_optional(struct udevice *dev,
304 struct reset_ctl *r = devm_reset_control_get(dev, id);
312 static void devm_reset_bulk_release(struct udevice *dev, void *res)
314 struct reset_ctl_bulk *bulk = res;
316 reset_release_all(bulk->resets, bulk->count);
319 struct reset_ctl_bulk *devm_reset_bulk_get_by_node(struct udevice *dev,
323 struct reset_ctl_bulk *bulk;
325 bulk = devres_alloc(devm_reset_bulk_release,
326 sizeof(struct reset_ctl_bulk),
329 /* this looks like a leak, but devres takes care of it */
331 return ERR_PTR(-ENOMEM);
333 rc = __reset_get_bulk(dev, node, bulk);
337 devres_add(dev, bulk);
341 struct reset_ctl_bulk *devm_reset_bulk_get_optional_by_node(struct udevice *dev,
344 struct reset_ctl_bulk *bulk;
346 bulk = devm_reset_bulk_get_by_node(dev, node);
354 struct reset_ctl_bulk *devm_reset_bulk_get(struct udevice *dev)
356 return devm_reset_bulk_get_by_node(dev, dev_ofnode(dev));
359 struct reset_ctl_bulk *devm_reset_bulk_get_optional(struct udevice *dev)
361 return devm_reset_bulk_get_optional_by_node(dev, dev_ofnode(dev));
364 UCLASS_DRIVER(reset) = {