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dm: core: Mark device as active before calling its probe() method
[karo-tx-uboot.git] / drivers / core / device.c
1 /*
2  * Device manager
3  *
4  * Copyright (c) 2013 Google, Inc
5  *
6  * (C) Copyright 2012
7  * Pavel Herrmann <morpheus.ibis@gmail.com>
8  *
9  * SPDX-License-Identifier:     GPL-2.0+
10  */
11
12 #include <common.h>
13 #include <fdtdec.h>
14 #include <malloc.h>
15 #include <dm/device.h>
16 #include <dm/device-internal.h>
17 #include <dm/lists.h>
18 #include <dm/platdata.h>
19 #include <dm/uclass.h>
20 #include <dm/uclass-internal.h>
21 #include <dm/util.h>
22 #include <linux/err.h>
23 #include <linux/list.h>
24
25 DECLARE_GLOBAL_DATA_PTR;
26
27 int device_bind(struct udevice *parent, struct driver *drv, const char *name,
28                 void *platdata, int of_offset, struct udevice **devp)
29 {
30         struct udevice *dev;
31         struct uclass *uc;
32         int ret = 0;
33
34         *devp = NULL;
35         if (!name)
36                 return -EINVAL;
37
38         ret = uclass_get(drv->id, &uc);
39         if (ret)
40                 return ret;
41
42         dev = calloc(1, sizeof(struct udevice));
43         if (!dev)
44                 return -ENOMEM;
45
46         INIT_LIST_HEAD(&dev->sibling_node);
47         INIT_LIST_HEAD(&dev->child_head);
48         INIT_LIST_HEAD(&dev->uclass_node);
49         dev->platdata = platdata;
50         dev->name = name;
51         dev->of_offset = of_offset;
52         dev->parent = parent;
53         dev->driver = drv;
54         dev->uclass = uc;
55
56         dev->seq = -1;
57         dev->req_seq = -1;
58 #ifdef CONFIG_OF_CONTROL
59         /*
60          * Some devices, such as a SPI bus, I2C bus and serial ports are
61          * numbered using aliases.
62          *
63          * This is just a 'requested' sequence, and will be
64          * resolved (and ->seq updated) when the device is probed.
65          */
66         if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
67                 if (uc->uc_drv->name && of_offset != -1) {
68                         fdtdec_get_alias_seq(gd->fdt_blob, uc->uc_drv->name,
69                                              of_offset, &dev->req_seq);
70                 }
71         }
72 #endif
73         if (!dev->platdata && drv->platdata_auto_alloc_size) {
74                 dev->flags |= DM_FLAG_ALLOC_PDATA;
75                 dev->platdata = calloc(1, drv->platdata_auto_alloc_size);
76                 if (!dev->platdata) {
77                         ret = -ENOMEM;
78                         goto fail_alloc1;
79                 }
80         }
81         if (parent) {
82                 int size = parent->driver->per_child_platdata_auto_alloc_size;
83
84                 if (!size) {
85                         size = parent->uclass->uc_drv->
86                                         per_child_platdata_auto_alloc_size;
87                 }
88                 if (size) {
89                         dev->flags |= DM_FLAG_ALLOC_PARENT_PDATA;
90                         dev->parent_platdata = calloc(1, size);
91                         if (!dev->parent_platdata) {
92                                 ret = -ENOMEM;
93                                 goto fail_alloc2;
94                         }
95                 }
96         }
97
98         /* put dev into parent's successor list */
99         if (parent)
100                 list_add_tail(&dev->sibling_node, &parent->child_head);
101
102         ret = uclass_bind_device(dev);
103         if (ret)
104                 goto fail_uclass_bind;
105
106         /* if we fail to bind we remove device from successors and free it */
107         if (drv->bind) {
108                 ret = drv->bind(dev);
109                 if (ret)
110                         goto fail_bind;
111         }
112         if (parent && parent->driver->child_post_bind) {
113                 ret = parent->driver->child_post_bind(dev);
114                 if (ret)
115                         goto fail_child_post_bind;
116         }
117
118         if (parent)
119                 dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
120         *devp = dev;
121
122         return 0;
123
124 fail_child_post_bind:
125         if (drv->unbind && drv->unbind(dev)) {
126                 dm_warn("unbind() method failed on dev '%s' on error path\n",
127                         dev->name);
128         }
129
130 fail_bind:
131         if (uclass_unbind_device(dev)) {
132                 dm_warn("Failed to unbind dev '%s' on error path\n",
133                         dev->name);
134         }
135 fail_uclass_bind:
136         list_del(&dev->sibling_node);
137         if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
138                 free(dev->parent_platdata);
139                 dev->parent_platdata = NULL;
140         }
141 fail_alloc2:
142         if (dev->flags & DM_FLAG_ALLOC_PDATA) {
143                 free(dev->platdata);
144                 dev->platdata = NULL;
145         }
146 fail_alloc1:
147         free(dev);
148
149         return ret;
150 }
151
152 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
153                         const struct driver_info *info, struct udevice **devp)
154 {
155         struct driver *drv;
156
157         drv = lists_driver_lookup_name(info->name);
158         if (!drv)
159                 return -ENOENT;
160         if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
161                 return -EPERM;
162
163         return device_bind(parent, drv, info->name, (void *)info->platdata,
164                            -1, devp);
165 }
166
167 int device_probe_child(struct udevice *dev, void *parent_priv)
168 {
169         struct driver *drv;
170         int size = 0;
171         int ret;
172         int seq;
173
174         if (!dev)
175                 return -EINVAL;
176
177         if (dev->flags & DM_FLAG_ACTIVATED)
178                 return 0;
179
180         drv = dev->driver;
181         assert(drv);
182
183         /* Allocate private data if requested */
184         if (drv->priv_auto_alloc_size) {
185                 dev->priv = calloc(1, drv->priv_auto_alloc_size);
186                 if (!dev->priv) {
187                         ret = -ENOMEM;
188                         goto fail;
189                 }
190         }
191         /* Allocate private data if requested */
192         size = dev->uclass->uc_drv->per_device_auto_alloc_size;
193         if (size) {
194                 dev->uclass_priv = calloc(1, size);
195                 if (!dev->uclass_priv) {
196                         ret = -ENOMEM;
197                         goto fail;
198                 }
199         }
200
201         /* Ensure all parents are probed */
202         if (dev->parent) {
203                 size = dev->parent->driver->per_child_auto_alloc_size;
204                 if (!size) {
205                         size = dev->parent->uclass->uc_drv->
206                                         per_child_auto_alloc_size;
207                 }
208                 if (size) {
209                         dev->parent_priv = calloc(1, size);
210                         if (!dev->parent_priv) {
211                                 ret = -ENOMEM;
212                                 goto fail;
213                         }
214                         if (parent_priv)
215                                 memcpy(dev->parent_priv, parent_priv, size);
216                 }
217
218                 ret = device_probe(dev->parent);
219                 if (ret)
220                         goto fail;
221         }
222
223         seq = uclass_resolve_seq(dev);
224         if (seq < 0) {
225                 ret = seq;
226                 goto fail;
227         }
228         dev->seq = seq;
229
230         ret = uclass_pre_probe_child(dev);
231         if (ret)
232                 goto fail;
233
234         if (dev->parent && dev->parent->driver->child_pre_probe) {
235                 ret = dev->parent->driver->child_pre_probe(dev);
236                 if (ret)
237                         goto fail;
238         }
239
240         if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
241                 ret = drv->ofdata_to_platdata(dev);
242                 if (ret)
243                         goto fail;
244         }
245
246         dev->flags |= DM_FLAG_ACTIVATED;
247         if (drv->probe) {
248                 ret = drv->probe(dev);
249                 if (ret) {
250                         dev->flags &= ~DM_FLAG_ACTIVATED;
251                         goto fail;
252                 }
253         }
254
255         ret = uclass_post_probe_device(dev);
256         if (ret) {
257                 dev->flags &= ~DM_FLAG_ACTIVATED;
258                 goto fail_uclass;
259         }
260
261         return 0;
262 fail_uclass:
263         if (device_remove(dev)) {
264                 dm_warn("%s: Device '%s' failed to remove on error path\n",
265                         __func__, dev->name);
266         }
267 fail:
268         dev->seq = -1;
269         device_free(dev);
270
271         return ret;
272 }
273
274 int device_probe(struct udevice *dev)
275 {
276         return device_probe_child(dev, NULL);
277 }
278
279 void *dev_get_platdata(struct udevice *dev)
280 {
281         if (!dev) {
282                 dm_warn("%s: null device\n", __func__);
283                 return NULL;
284         }
285
286         return dev->platdata;
287 }
288
289 void *dev_get_parent_platdata(struct udevice *dev)
290 {
291         if (!dev) {
292                 dm_warn("%s: null device", __func__);
293                 return NULL;
294         }
295
296         return dev->parent_platdata;
297 }
298
299 void *dev_get_priv(struct udevice *dev)
300 {
301         if (!dev) {
302                 dm_warn("%s: null device\n", __func__);
303                 return NULL;
304         }
305
306         return dev->priv;
307 }
308
309 void *dev_get_uclass_priv(struct udevice *dev)
310 {
311         if (!dev) {
312                 dm_warn("%s: null device\n", __func__);
313                 return NULL;
314         }
315
316         return dev->uclass_priv;
317 }
318
319 void *dev_get_parentdata(struct udevice *dev)
320 {
321         if (!dev) {
322                 dm_warn("%s: null device\n", __func__);
323                 return NULL;
324         }
325
326         return dev->parent_priv;
327 }
328
329 static int device_get_device_tail(struct udevice *dev, int ret,
330                                   struct udevice **devp)
331 {
332         if (ret)
333                 return ret;
334
335         ret = device_probe(dev);
336         if (ret)
337                 return ret;
338
339         *devp = dev;
340
341         return 0;
342 }
343
344 int device_get_child(struct udevice *parent, int index, struct udevice **devp)
345 {
346         struct udevice *dev;
347
348         list_for_each_entry(dev, &parent->child_head, sibling_node) {
349                 if (!index--)
350                         return device_get_device_tail(dev, 0, devp);
351         }
352
353         return -ENODEV;
354 }
355
356 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
357                              bool find_req_seq, struct udevice **devp)
358 {
359         struct udevice *dev;
360
361         *devp = NULL;
362         if (seq_or_req_seq == -1)
363                 return -ENODEV;
364
365         list_for_each_entry(dev, &parent->child_head, sibling_node) {
366                 if ((find_req_seq ? dev->req_seq : dev->seq) ==
367                                 seq_or_req_seq) {
368                         *devp = dev;
369                         return 0;
370                 }
371         }
372
373         return -ENODEV;
374 }
375
376 int device_get_child_by_seq(struct udevice *parent, int seq,
377                             struct udevice **devp)
378 {
379         struct udevice *dev;
380         int ret;
381
382         *devp = NULL;
383         ret = device_find_child_by_seq(parent, seq, false, &dev);
384         if (ret == -ENODEV) {
385                 /*
386                  * We didn't find it in probed devices. See if there is one
387                  * that will request this seq if probed.
388                  */
389                 ret = device_find_child_by_seq(parent, seq, true, &dev);
390         }
391         return device_get_device_tail(dev, ret, devp);
392 }
393
394 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
395                                    struct udevice **devp)
396 {
397         struct udevice *dev;
398
399         *devp = NULL;
400
401         list_for_each_entry(dev, &parent->child_head, sibling_node) {
402                 if (dev->of_offset == of_offset) {
403                         *devp = dev;
404                         return 0;
405                 }
406         }
407
408         return -ENODEV;
409 }
410
411 int device_get_child_by_of_offset(struct udevice *parent, int seq,
412                                   struct udevice **devp)
413 {
414         struct udevice *dev;
415         int ret;
416
417         *devp = NULL;
418         ret = device_find_child_by_of_offset(parent, seq, &dev);
419         return device_get_device_tail(dev, ret, devp);
420 }
421
422 int device_find_first_child(struct udevice *parent, struct udevice **devp)
423 {
424         if (list_empty(&parent->child_head)) {
425                 *devp = NULL;
426         } else {
427                 *devp = list_first_entry(&parent->child_head, struct udevice,
428                                          sibling_node);
429         }
430
431         return 0;
432 }
433
434 int device_find_next_child(struct udevice **devp)
435 {
436         struct udevice *dev = *devp;
437         struct udevice *parent = dev->parent;
438
439         if (list_is_last(&dev->sibling_node, &parent->child_head)) {
440                 *devp = NULL;
441         } else {
442                 *devp = list_entry(dev->sibling_node.next, struct udevice,
443                                    sibling_node);
444         }
445
446         return 0;
447 }
448
449 struct udevice *dev_get_parent(struct udevice *child)
450 {
451         return child->parent;
452 }
453
454 ulong dev_get_of_data(struct udevice *dev)
455 {
456         return dev->of_id->data;
457 }
458
459 enum uclass_id device_get_uclass_id(struct udevice *dev)
460 {
461         return dev->uclass->uc_drv->id;
462 }
463
464 #ifdef CONFIG_OF_CONTROL
465 fdt_addr_t dev_get_addr(struct udevice *dev)
466 {
467         return fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
468 }
469 #else
470 fdt_addr_t dev_get_addr(struct udevice *dev)
471 {
472         return FDT_ADDR_T_NONE;
473 }
474 #endif