Merge branch 'master' of git://git.denx.de/u-boot
[platform/kernel/u-boot.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 <fdt_support.h>
15 #include <malloc.h>
16 #include <dm/device.h>
17 #include <dm/device-internal.h>
18 #include <dm/lists.h>
19 #include <dm/pinctrl.h>
20 #include <dm/platdata.h>
21 #include <dm/uclass.h>
22 #include <dm/uclass-internal.h>
23 #include <dm/util.h>
24 #include <linux/err.h>
25 #include <linux/list.h>
26
27 DECLARE_GLOBAL_DATA_PTR;
28
29 int device_bind(struct udevice *parent, const struct driver *drv,
30                 const char *name, void *platdata, int of_offset,
31                 struct udevice **devp)
32 {
33         struct udevice *dev;
34         struct uclass *uc;
35         int size, ret = 0;
36
37         if (devp)
38                 *devp = NULL;
39         if (!name)
40                 return -EINVAL;
41
42         ret = uclass_get(drv->id, &uc);
43         if (ret) {
44                 debug("Missing uclass for driver %s\n", drv->name);
45                 return ret;
46         }
47
48         dev = calloc(1, sizeof(struct udevice));
49         if (!dev)
50                 return -ENOMEM;
51
52         INIT_LIST_HEAD(&dev->sibling_node);
53         INIT_LIST_HEAD(&dev->child_head);
54         INIT_LIST_HEAD(&dev->uclass_node);
55 #ifdef CONFIG_DEVRES
56         INIT_LIST_HEAD(&dev->devres_head);
57 #endif
58         dev->platdata = platdata;
59         dev->name = name;
60         dev->of_offset = of_offset;
61         dev->parent = parent;
62         dev->driver = drv;
63         dev->uclass = uc;
64
65         dev->seq = -1;
66         dev->req_seq = -1;
67         if (CONFIG_IS_ENABLED(OF_CONTROL) && IS_ENABLED(CONFIG_DM_SEQ_ALIAS)) {
68                 /*
69                 * Some devices, such as a SPI bus, I2C bus and serial ports
70                 * are numbered using aliases.
71                 *
72                 * This is just a 'requested' sequence, and will be
73                 * resolved (and ->seq updated) when the device is probed.
74                 */
75                 if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
76                         if (uc->uc_drv->name && of_offset != -1) {
77                                 fdtdec_get_alias_seq(gd->fdt_blob,
78                                                 uc->uc_drv->name, of_offset,
79                                                 &dev->req_seq);
80                         }
81                 }
82         }
83
84         if (!dev->platdata && drv->platdata_auto_alloc_size) {
85                 dev->flags |= DM_FLAG_ALLOC_PDATA;
86                 dev->platdata = calloc(1, drv->platdata_auto_alloc_size);
87                 if (!dev->platdata) {
88                         ret = -ENOMEM;
89                         goto fail_alloc1;
90                 }
91         }
92
93         size = uc->uc_drv->per_device_platdata_auto_alloc_size;
94         if (size) {
95                 dev->flags |= DM_FLAG_ALLOC_UCLASS_PDATA;
96                 dev->uclass_platdata = calloc(1, size);
97                 if (!dev->uclass_platdata) {
98                         ret = -ENOMEM;
99                         goto fail_alloc2;
100                 }
101         }
102
103         if (parent) {
104                 size = parent->driver->per_child_platdata_auto_alloc_size;
105                 if (!size) {
106                         size = parent->uclass->uc_drv->
107                                         per_child_platdata_auto_alloc_size;
108                 }
109                 if (size) {
110                         dev->flags |= DM_FLAG_ALLOC_PARENT_PDATA;
111                         dev->parent_platdata = calloc(1, size);
112                         if (!dev->parent_platdata) {
113                                 ret = -ENOMEM;
114                                 goto fail_alloc3;
115                         }
116                 }
117         }
118
119         /* put dev into parent's successor list */
120         if (parent)
121                 list_add_tail(&dev->sibling_node, &parent->child_head);
122
123         ret = uclass_bind_device(dev);
124         if (ret)
125                 goto fail_uclass_bind;
126
127         /* if we fail to bind we remove device from successors and free it */
128         if (drv->bind) {
129                 ret = drv->bind(dev);
130                 if (ret)
131                         goto fail_bind;
132         }
133         if (parent && parent->driver->child_post_bind) {
134                 ret = parent->driver->child_post_bind(dev);
135                 if (ret)
136                         goto fail_child_post_bind;
137         }
138
139         if (parent)
140                 dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
141         if (devp)
142                 *devp = dev;
143
144         dev->flags |= DM_FLAG_BOUND;
145
146         return 0;
147
148 fail_child_post_bind:
149         if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
150                 if (drv->unbind && drv->unbind(dev)) {
151                         dm_warn("unbind() method failed on dev '%s' on error path\n",
152                                 dev->name);
153                 }
154         }
155
156 fail_bind:
157         if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
158                 if (uclass_unbind_device(dev)) {
159                         dm_warn("Failed to unbind dev '%s' on error path\n",
160                                 dev->name);
161                 }
162         }
163 fail_uclass_bind:
164         if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
165                 list_del(&dev->sibling_node);
166                 if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
167                         free(dev->parent_platdata);
168                         dev->parent_platdata = NULL;
169                 }
170         }
171 fail_alloc3:
172         if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
173                 free(dev->uclass_platdata);
174                 dev->uclass_platdata = NULL;
175         }
176 fail_alloc2:
177         if (dev->flags & DM_FLAG_ALLOC_PDATA) {
178                 free(dev->platdata);
179                 dev->platdata = NULL;
180         }
181 fail_alloc1:
182         devres_release_all(dev);
183
184         free(dev);
185
186         return ret;
187 }
188
189 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
190                         const struct driver_info *info, struct udevice **devp)
191 {
192         struct driver *drv;
193
194         drv = lists_driver_lookup_name(info->name);
195         if (!drv)
196                 return -ENOENT;
197         if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
198                 return -EPERM;
199
200         return device_bind(parent, drv, info->name, (void *)info->platdata,
201                            -1, devp);
202 }
203
204 static void *alloc_priv(int size, uint flags)
205 {
206         void *priv;
207
208         if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
209                 priv = memalign(ARCH_DMA_MINALIGN, size);
210                 if (priv)
211                         memset(priv, '\0', size);
212         } else {
213                 priv = calloc(1, size);
214         }
215
216         return priv;
217 }
218
219 int device_probe_child(struct udevice *dev, void *parent_priv)
220 {
221         const struct driver *drv;
222         int size = 0;
223         int ret;
224         int seq;
225
226         if (!dev)
227                 return -EINVAL;
228
229         if (dev->flags & DM_FLAG_ACTIVATED)
230                 return 0;
231
232         drv = dev->driver;
233         assert(drv);
234
235         /* Allocate private data if requested and not reentered */
236         if (drv->priv_auto_alloc_size && !dev->priv) {
237                 dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags);
238                 if (!dev->priv) {
239                         ret = -ENOMEM;
240                         goto fail;
241                 }
242         }
243         /* Allocate private data if requested and not reentered */
244         size = dev->uclass->uc_drv->per_device_auto_alloc_size;
245         if (size && !dev->uclass_priv) {
246                 dev->uclass_priv = calloc(1, size);
247                 if (!dev->uclass_priv) {
248                         ret = -ENOMEM;
249                         goto fail;
250                 }
251         }
252
253         /* Ensure all parents are probed */
254         if (dev->parent) {
255                 size = dev->parent->driver->per_child_auto_alloc_size;
256                 if (!size) {
257                         size = dev->parent->uclass->uc_drv->
258                                         per_child_auto_alloc_size;
259                 }
260                 if (size && !dev->parent_priv) {
261                         dev->parent_priv = alloc_priv(size, drv->flags);
262                         if (!dev->parent_priv) {
263                                 ret = -ENOMEM;
264                                 goto fail;
265                         }
266                         if (parent_priv)
267                                 memcpy(dev->parent_priv, parent_priv, size);
268                 }
269
270                 ret = device_probe(dev->parent);
271                 if (ret)
272                         goto fail;
273
274                 /*
275                  * The device might have already been probed during
276                  * the call to device_probe() on its parent device
277                  * (e.g. PCI bridge devices). Test the flags again
278                  * so that we don't mess up the device.
279                  */
280                 if (dev->flags & DM_FLAG_ACTIVATED)
281                         return 0;
282         }
283
284         seq = uclass_resolve_seq(dev);
285         if (seq < 0) {
286                 ret = seq;
287                 goto fail;
288         }
289         dev->seq = seq;
290
291         dev->flags |= DM_FLAG_ACTIVATED;
292
293         /*
294          * Process pinctrl for everything except the root device, and
295          * continue regardless of the result of pinctrl.
296          */
297         if (dev->parent)
298                 pinctrl_select_state(dev, "default");
299
300         ret = uclass_pre_probe_device(dev);
301         if (ret)
302                 goto fail;
303
304         if (dev->parent && dev->parent->driver->child_pre_probe) {
305                 ret = dev->parent->driver->child_pre_probe(dev);
306                 if (ret)
307                         goto fail;
308         }
309
310         if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
311                 ret = drv->ofdata_to_platdata(dev);
312                 if (ret)
313                         goto fail;
314         }
315
316         if (drv->probe) {
317                 ret = drv->probe(dev);
318                 if (ret) {
319                         dev->flags &= ~DM_FLAG_ACTIVATED;
320                         goto fail;
321                 }
322         }
323
324         ret = uclass_post_probe_device(dev);
325         if (ret)
326                 goto fail_uclass;
327
328         return 0;
329 fail_uclass:
330         if (device_remove(dev)) {
331                 dm_warn("%s: Device '%s' failed to remove on error path\n",
332                         __func__, dev->name);
333         }
334 fail:
335         dev->flags &= ~DM_FLAG_ACTIVATED;
336
337         dev->seq = -1;
338         device_free(dev);
339
340         return ret;
341 }
342
343 int device_probe(struct udevice *dev)
344 {
345         return device_probe_child(dev, NULL);
346 }
347
348 void *dev_get_platdata(struct udevice *dev)
349 {
350         if (!dev) {
351                 dm_warn("%s: null device\n", __func__);
352                 return NULL;
353         }
354
355         return dev->platdata;
356 }
357
358 void *dev_get_parent_platdata(struct udevice *dev)
359 {
360         if (!dev) {
361                 dm_warn("%s: null device\n", __func__);
362                 return NULL;
363         }
364
365         return dev->parent_platdata;
366 }
367
368 void *dev_get_uclass_platdata(struct udevice *dev)
369 {
370         if (!dev) {
371                 dm_warn("%s: null device\n", __func__);
372                 return NULL;
373         }
374
375         return dev->uclass_platdata;
376 }
377
378 void *dev_get_priv(struct udevice *dev)
379 {
380         if (!dev) {
381                 dm_warn("%s: null device\n", __func__);
382                 return NULL;
383         }
384
385         return dev->priv;
386 }
387
388 void *dev_get_uclass_priv(struct udevice *dev)
389 {
390         if (!dev) {
391                 dm_warn("%s: null device\n", __func__);
392                 return NULL;
393         }
394
395         return dev->uclass_priv;
396 }
397
398 void *dev_get_parentdata(struct udevice *dev)
399 {
400         if (!dev) {
401                 dm_warn("%s: null device\n", __func__);
402                 return NULL;
403         }
404
405         return dev->parent_priv;
406 }
407
408 static int device_get_device_tail(struct udevice *dev, int ret,
409                                   struct udevice **devp)
410 {
411         if (ret)
412                 return ret;
413
414         ret = device_probe(dev);
415         if (ret)
416                 return ret;
417
418         *devp = dev;
419
420         return 0;
421 }
422
423 int device_get_child(struct udevice *parent, int index, struct udevice **devp)
424 {
425         struct udevice *dev;
426
427         list_for_each_entry(dev, &parent->child_head, sibling_node) {
428                 if (!index--)
429                         return device_get_device_tail(dev, 0, devp);
430         }
431
432         return -ENODEV;
433 }
434
435 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
436                              bool find_req_seq, struct udevice **devp)
437 {
438         struct udevice *dev;
439
440         *devp = NULL;
441         if (seq_or_req_seq == -1)
442                 return -ENODEV;
443
444         list_for_each_entry(dev, &parent->child_head, sibling_node) {
445                 if ((find_req_seq ? dev->req_seq : dev->seq) ==
446                                 seq_or_req_seq) {
447                         *devp = dev;
448                         return 0;
449                 }
450         }
451
452         return -ENODEV;
453 }
454
455 int device_get_child_by_seq(struct udevice *parent, int seq,
456                             struct udevice **devp)
457 {
458         struct udevice *dev;
459         int ret;
460
461         *devp = NULL;
462         ret = device_find_child_by_seq(parent, seq, false, &dev);
463         if (ret == -ENODEV) {
464                 /*
465                  * We didn't find it in probed devices. See if there is one
466                  * that will request this seq if probed.
467                  */
468                 ret = device_find_child_by_seq(parent, seq, true, &dev);
469         }
470         return device_get_device_tail(dev, ret, devp);
471 }
472
473 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
474                                    struct udevice **devp)
475 {
476         struct udevice *dev;
477
478         *devp = NULL;
479
480         list_for_each_entry(dev, &parent->child_head, sibling_node) {
481                 if (dev->of_offset == of_offset) {
482                         *devp = dev;
483                         return 0;
484                 }
485         }
486
487         return -ENODEV;
488 }
489
490 int device_get_child_by_of_offset(struct udevice *parent, int node,
491                                   struct udevice **devp)
492 {
493         struct udevice *dev;
494         int ret;
495
496         *devp = NULL;
497         ret = device_find_child_by_of_offset(parent, node, &dev);
498         return device_get_device_tail(dev, ret, devp);
499 }
500
501 static struct udevice *_device_find_global_by_of_offset(struct udevice *parent,
502                                                         int of_offset)
503 {
504         struct udevice *dev, *found;
505
506         if (parent->of_offset == of_offset)
507                 return parent;
508
509         list_for_each_entry(dev, &parent->child_head, sibling_node) {
510                 found = _device_find_global_by_of_offset(dev, of_offset);
511                 if (found)
512                         return found;
513         }
514
515         return NULL;
516 }
517
518 int device_get_global_by_of_offset(int of_offset, struct udevice **devp)
519 {
520         struct udevice *dev;
521
522         dev = _device_find_global_by_of_offset(gd->dm_root, of_offset);
523         return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
524 }
525
526 int device_find_first_child(struct udevice *parent, struct udevice **devp)
527 {
528         if (list_empty(&parent->child_head)) {
529                 *devp = NULL;
530         } else {
531                 *devp = list_first_entry(&parent->child_head, struct udevice,
532                                          sibling_node);
533         }
534
535         return 0;
536 }
537
538 int device_find_next_child(struct udevice **devp)
539 {
540         struct udevice *dev = *devp;
541         struct udevice *parent = dev->parent;
542
543         if (list_is_last(&dev->sibling_node, &parent->child_head)) {
544                 *devp = NULL;
545         } else {
546                 *devp = list_entry(dev->sibling_node.next, struct udevice,
547                                    sibling_node);
548         }
549
550         return 0;
551 }
552
553 struct udevice *dev_get_parent(struct udevice *child)
554 {
555         return child->parent;
556 }
557
558 ulong dev_get_driver_data(struct udevice *dev)
559 {
560         return dev->driver_data;
561 }
562
563 const void *dev_get_driver_ops(struct udevice *dev)
564 {
565         if (!dev || !dev->driver->ops)
566                 return NULL;
567
568         return dev->driver->ops;
569 }
570
571 enum uclass_id device_get_uclass_id(struct udevice *dev)
572 {
573         return dev->uclass->uc_drv->id;
574 }
575
576 const char *dev_get_uclass_name(struct udevice *dev)
577 {
578         if (!dev)
579                 return NULL;
580
581         return dev->uclass->uc_drv->name;
582 }
583
584 fdt_addr_t dev_get_addr(struct udevice *dev)
585 {
586 #if CONFIG_IS_ENABLED(OF_CONTROL)
587         fdt_addr_t addr;
588
589         if (CONFIG_IS_ENABLED(OF_TRANSLATE)) {
590                 const fdt32_t *reg;
591
592                 reg = fdt_getprop(gd->fdt_blob, dev->of_offset, "reg", NULL);
593                 if (!reg)
594                         return FDT_ADDR_T_NONE;
595
596                 /*
597                  * Use the full-fledged translate function for complex
598                  * bus setups.
599                  */
600                 return fdt_translate_address((void *)gd->fdt_blob,
601                                              dev->of_offset, reg);
602         }
603
604         /*
605          * Use the "simple" translate function for less complex
606          * bus setups.
607          */
608         addr = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
609                                                 dev->parent->of_offset,
610                                                 dev->of_offset, "reg",
611                                                 0, NULL);
612         if (CONFIG_IS_ENABLED(SIMPLE_BUS) && addr != FDT_ADDR_T_NONE) {
613                 if (device_get_uclass_id(dev->parent) == UCLASS_SIMPLE_BUS)
614                         addr = simple_bus_translate(dev->parent, addr);
615         }
616
617         return addr;
618 #else
619         return FDT_ADDR_T_NONE;
620 #endif
621 }
622
623 bool device_has_children(struct udevice *dev)
624 {
625         return !list_empty(&dev->child_head);
626 }
627
628 bool device_has_active_children(struct udevice *dev)
629 {
630         struct udevice *child;
631
632         for (device_find_first_child(dev, &child);
633              child;
634              device_find_next_child(&child)) {
635                 if (device_active(child))
636                         return true;
637         }
638
639         return false;
640 }
641
642 bool device_is_last_sibling(struct udevice *dev)
643 {
644         struct udevice *parent = dev->parent;
645
646         if (!parent)
647                 return false;
648         return list_is_last(&dev->sibling_node, &parent->child_head);
649 }
650
651 int device_set_name(struct udevice *dev, const char *name)
652 {
653         name = strdup(name);
654         if (!name)
655                 return -ENOMEM;
656         dev->name = name;
657
658         return 0;
659 }