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Merge git://git.denx.de/u-boot-dm
[u-boot] / 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 static int device_bind_common(struct udevice *parent, const struct driver *drv,
30                               const char *name, void *platdata,
31                               ulong driver_data, int of_offset,
32                               struct udevice **devp)
33 {
34         struct udevice *dev;
35         struct uclass *uc;
36         int size, ret = 0;
37
38         if (devp)
39                 *devp = NULL;
40         if (!name)
41                 return -EINVAL;
42
43         ret = uclass_get(drv->id, &uc);
44         if (ret) {
45                 debug("Missing uclass for driver %s\n", drv->name);
46                 return ret;
47         }
48
49         dev = calloc(1, sizeof(struct udevice));
50         if (!dev)
51                 return -ENOMEM;
52
53         INIT_LIST_HEAD(&dev->sibling_node);
54         INIT_LIST_HEAD(&dev->child_head);
55         INIT_LIST_HEAD(&dev->uclass_node);
56 #ifdef CONFIG_DEVRES
57         INIT_LIST_HEAD(&dev->devres_head);
58 #endif
59         dev->platdata = platdata;
60         dev->driver_data = driver_data;
61         dev->name = name;
62         dev->of_offset = of_offset;
63         dev->parent = parent;
64         dev->driver = drv;
65         dev->uclass = uc;
66
67         dev->seq = -1;
68         dev->req_seq = -1;
69         if (CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(DM_SEQ_ALIAS)) {
70                 /*
71                  * Some devices, such as a SPI bus, I2C bus and serial ports
72                  * are numbered using aliases.
73                  *
74                  * This is just a 'requested' sequence, and will be
75                  * resolved (and ->seq updated) when the device is probed.
76                  */
77                 if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
78                         if (uc->uc_drv->name && of_offset != -1) {
79                                 fdtdec_get_alias_seq(gd->fdt_blob,
80                                                 uc->uc_drv->name, of_offset,
81                                                 &dev->req_seq);
82                         }
83                 }
84         }
85
86         if (!dev->platdata && drv->platdata_auto_alloc_size) {
87                 dev->flags |= DM_FLAG_ALLOC_PDATA;
88                 dev->platdata = calloc(1, drv->platdata_auto_alloc_size);
89                 if (!dev->platdata) {
90                         ret = -ENOMEM;
91                         goto fail_alloc1;
92                 }
93         }
94
95         size = uc->uc_drv->per_device_platdata_auto_alloc_size;
96         if (size) {
97                 dev->flags |= DM_FLAG_ALLOC_UCLASS_PDATA;
98                 dev->uclass_platdata = calloc(1, size);
99                 if (!dev->uclass_platdata) {
100                         ret = -ENOMEM;
101                         goto fail_alloc2;
102                 }
103         }
104
105         if (parent) {
106                 size = parent->driver->per_child_platdata_auto_alloc_size;
107                 if (!size) {
108                         size = parent->uclass->uc_drv->
109                                         per_child_platdata_auto_alloc_size;
110                 }
111                 if (size) {
112                         dev->flags |= DM_FLAG_ALLOC_PARENT_PDATA;
113                         dev->parent_platdata = calloc(1, size);
114                         if (!dev->parent_platdata) {
115                                 ret = -ENOMEM;
116                                 goto fail_alloc3;
117                         }
118                 }
119         }
120
121         /* put dev into parent's successor list */
122         if (parent)
123                 list_add_tail(&dev->sibling_node, &parent->child_head);
124
125         ret = uclass_bind_device(dev);
126         if (ret)
127                 goto fail_uclass_bind;
128
129         /* if we fail to bind we remove device from successors and free it */
130         if (drv->bind) {
131                 ret = drv->bind(dev);
132                 if (ret)
133                         goto fail_bind;
134         }
135         if (parent && parent->driver->child_post_bind) {
136                 ret = parent->driver->child_post_bind(dev);
137                 if (ret)
138                         goto fail_child_post_bind;
139         }
140         if (uc->uc_drv->post_bind) {
141                 ret = uc->uc_drv->post_bind(dev);
142                 if (ret)
143                         goto fail_uclass_post_bind;
144         }
145
146         if (parent)
147                 dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
148         if (devp)
149                 *devp = dev;
150
151         dev->flags |= DM_FLAG_BOUND;
152
153         return 0;
154
155 fail_uclass_post_bind:
156         /* There is no child unbind() method, so no clean-up required */
157 fail_child_post_bind:
158         if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
159                 if (drv->unbind && drv->unbind(dev)) {
160                         dm_warn("unbind() method failed on dev '%s' on error path\n",
161                                 dev->name);
162                 }
163         }
164
165 fail_bind:
166         if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
167                 if (uclass_unbind_device(dev)) {
168                         dm_warn("Failed to unbind dev '%s' on error path\n",
169                                 dev->name);
170                 }
171         }
172 fail_uclass_bind:
173         if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
174                 list_del(&dev->sibling_node);
175                 if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
176                         free(dev->parent_platdata);
177                         dev->parent_platdata = NULL;
178                 }
179         }
180 fail_alloc3:
181         if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
182                 free(dev->uclass_platdata);
183                 dev->uclass_platdata = NULL;
184         }
185 fail_alloc2:
186         if (dev->flags & DM_FLAG_ALLOC_PDATA) {
187                 free(dev->platdata);
188                 dev->platdata = NULL;
189         }
190 fail_alloc1:
191         devres_release_all(dev);
192
193         free(dev);
194
195         return ret;
196 }
197
198 int device_bind_with_driver_data(struct udevice *parent,
199                                  const struct driver *drv, const char *name,
200                                  ulong driver_data, int of_offset,
201                                  struct udevice **devp)
202 {
203         return device_bind_common(parent, drv, name, NULL, driver_data,
204                                   of_offset, devp);
205 }
206
207 int device_bind(struct udevice *parent, const struct driver *drv,
208                 const char *name, void *platdata, int of_offset,
209                 struct udevice **devp)
210 {
211         return device_bind_common(parent, drv, name, platdata, 0, of_offset,
212                                   devp);
213 }
214
215 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
216                         const struct driver_info *info, struct udevice **devp)
217 {
218         struct driver *drv;
219
220         drv = lists_driver_lookup_name(info->name);
221         if (!drv)
222                 return -ENOENT;
223         if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
224                 return -EPERM;
225
226         return device_bind(parent, drv, info->name, (void *)info->platdata,
227                            -1, devp);
228 }
229
230 static void *alloc_priv(int size, uint flags)
231 {
232         void *priv;
233
234         if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
235                 priv = memalign(ARCH_DMA_MINALIGN, size);
236                 if (priv)
237                         memset(priv, '\0', size);
238         } else {
239                 priv = calloc(1, size);
240         }
241
242         return priv;
243 }
244
245 int device_probe(struct udevice *dev)
246 {
247         const struct driver *drv;
248         int size = 0;
249         int ret;
250         int seq;
251
252         if (!dev)
253                 return -EINVAL;
254
255         if (dev->flags & DM_FLAG_ACTIVATED)
256                 return 0;
257
258         drv = dev->driver;
259         assert(drv);
260
261         /* Allocate private data if requested and not reentered */
262         if (drv->priv_auto_alloc_size && !dev->priv) {
263                 dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags);
264                 if (!dev->priv) {
265                         ret = -ENOMEM;
266                         goto fail;
267                 }
268         }
269         /* Allocate private data if requested and not reentered */
270         size = dev->uclass->uc_drv->per_device_auto_alloc_size;
271         if (size && !dev->uclass_priv) {
272                 dev->uclass_priv = calloc(1, size);
273                 if (!dev->uclass_priv) {
274                         ret = -ENOMEM;
275                         goto fail;
276                 }
277         }
278
279         /* Ensure all parents are probed */
280         if (dev->parent) {
281                 size = dev->parent->driver->per_child_auto_alloc_size;
282                 if (!size) {
283                         size = dev->parent->uclass->uc_drv->
284                                         per_child_auto_alloc_size;
285                 }
286                 if (size && !dev->parent_priv) {
287                         dev->parent_priv = alloc_priv(size, drv->flags);
288                         if (!dev->parent_priv) {
289                                 ret = -ENOMEM;
290                                 goto fail;
291                         }
292                 }
293
294                 ret = device_probe(dev->parent);
295                 if (ret)
296                         goto fail;
297
298                 /*
299                  * The device might have already been probed during
300                  * the call to device_probe() on its parent device
301                  * (e.g. PCI bridge devices). Test the flags again
302                  * so that we don't mess up the device.
303                  */
304                 if (dev->flags & DM_FLAG_ACTIVATED)
305                         return 0;
306         }
307
308         seq = uclass_resolve_seq(dev);
309         if (seq < 0) {
310                 ret = seq;
311                 goto fail;
312         }
313         dev->seq = seq;
314
315         dev->flags |= DM_FLAG_ACTIVATED;
316
317         /*
318          * Process pinctrl for everything except the root device, and
319          * continue regardless of the result of pinctrl. Don't process pinctrl
320          * settings for pinctrl devices since the device may not yet be
321          * probed.
322          */
323         if (dev->parent && device_get_uclass_id(dev) != UCLASS_PINCTRL)
324                 pinctrl_select_state(dev, "default");
325
326         ret = uclass_pre_probe_device(dev);
327         if (ret)
328                 goto fail;
329
330         if (dev->parent && dev->parent->driver->child_pre_probe) {
331                 ret = dev->parent->driver->child_pre_probe(dev);
332                 if (ret)
333                         goto fail;
334         }
335
336         if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
337                 ret = drv->ofdata_to_platdata(dev);
338                 if (ret)
339                         goto fail;
340         }
341
342         if (drv->probe) {
343                 ret = drv->probe(dev);
344                 if (ret) {
345                         dev->flags &= ~DM_FLAG_ACTIVATED;
346                         goto fail;
347                 }
348         }
349
350         ret = uclass_post_probe_device(dev);
351         if (ret)
352                 goto fail_uclass;
353
354         if (dev->parent && device_get_uclass_id(dev) == UCLASS_PINCTRL)
355                 pinctrl_select_state(dev, "default");
356
357         return 0;
358 fail_uclass:
359         if (device_remove(dev)) {
360                 dm_warn("%s: Device '%s' failed to remove on error path\n",
361                         __func__, dev->name);
362         }
363 fail:
364         dev->flags &= ~DM_FLAG_ACTIVATED;
365
366         dev->seq = -1;
367         device_free(dev);
368
369         return ret;
370 }
371
372 void *dev_get_platdata(struct udevice *dev)
373 {
374         if (!dev) {
375                 dm_warn("%s: null device\n", __func__);
376                 return NULL;
377         }
378
379         return dev->platdata;
380 }
381
382 void *dev_get_parent_platdata(struct udevice *dev)
383 {
384         if (!dev) {
385                 dm_warn("%s: null device\n", __func__);
386                 return NULL;
387         }
388
389         return dev->parent_platdata;
390 }
391
392 void *dev_get_uclass_platdata(struct udevice *dev)
393 {
394         if (!dev) {
395                 dm_warn("%s: null device\n", __func__);
396                 return NULL;
397         }
398
399         return dev->uclass_platdata;
400 }
401
402 void *dev_get_priv(struct udevice *dev)
403 {
404         if (!dev) {
405                 dm_warn("%s: null device\n", __func__);
406                 return NULL;
407         }
408
409         return dev->priv;
410 }
411
412 void *dev_get_uclass_priv(struct udevice *dev)
413 {
414         if (!dev) {
415                 dm_warn("%s: null device\n", __func__);
416                 return NULL;
417         }
418
419         return dev->uclass_priv;
420 }
421
422 void *dev_get_parent_priv(struct udevice *dev)
423 {
424         if (!dev) {
425                 dm_warn("%s: null device\n", __func__);
426                 return NULL;
427         }
428
429         return dev->parent_priv;
430 }
431
432 static int device_get_device_tail(struct udevice *dev, int ret,
433                                   struct udevice **devp)
434 {
435         if (ret)
436                 return ret;
437
438         ret = device_probe(dev);
439         if (ret)
440                 return ret;
441
442         *devp = dev;
443
444         return 0;
445 }
446
447 int device_get_child(struct udevice *parent, int index, struct udevice **devp)
448 {
449         struct udevice *dev;
450
451         list_for_each_entry(dev, &parent->child_head, sibling_node) {
452                 if (!index--)
453                         return device_get_device_tail(dev, 0, devp);
454         }
455
456         return -ENODEV;
457 }
458
459 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
460                              bool find_req_seq, struct udevice **devp)
461 {
462         struct udevice *dev;
463
464         *devp = NULL;
465         if (seq_or_req_seq == -1)
466                 return -ENODEV;
467
468         list_for_each_entry(dev, &parent->child_head, sibling_node) {
469                 if ((find_req_seq ? dev->req_seq : dev->seq) ==
470                                 seq_or_req_seq) {
471                         *devp = dev;
472                         return 0;
473                 }
474         }
475
476         return -ENODEV;
477 }
478
479 int device_get_child_by_seq(struct udevice *parent, int seq,
480                             struct udevice **devp)
481 {
482         struct udevice *dev;
483         int ret;
484
485         *devp = NULL;
486         ret = device_find_child_by_seq(parent, seq, false, &dev);
487         if (ret == -ENODEV) {
488                 /*
489                  * We didn't find it in probed devices. See if there is one
490                  * that will request this seq if probed.
491                  */
492                 ret = device_find_child_by_seq(parent, seq, true, &dev);
493         }
494         return device_get_device_tail(dev, ret, devp);
495 }
496
497 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
498                                    struct udevice **devp)
499 {
500         struct udevice *dev;
501
502         *devp = NULL;
503
504         list_for_each_entry(dev, &parent->child_head, sibling_node) {
505                 if (dev->of_offset == of_offset) {
506                         *devp = dev;
507                         return 0;
508                 }
509         }
510
511         return -ENODEV;
512 }
513
514 int device_get_child_by_of_offset(struct udevice *parent, int node,
515                                   struct udevice **devp)
516 {
517         struct udevice *dev;
518         int ret;
519
520         *devp = NULL;
521         ret = device_find_child_by_of_offset(parent, node, &dev);
522         return device_get_device_tail(dev, ret, devp);
523 }
524
525 static struct udevice *_device_find_global_by_of_offset(struct udevice *parent,
526                                                         int of_offset)
527 {
528         struct udevice *dev, *found;
529
530         if (parent->of_offset == of_offset)
531                 return parent;
532
533         list_for_each_entry(dev, &parent->child_head, sibling_node) {
534                 found = _device_find_global_by_of_offset(dev, of_offset);
535                 if (found)
536                         return found;
537         }
538
539         return NULL;
540 }
541
542 int device_get_global_by_of_offset(int of_offset, struct udevice **devp)
543 {
544         struct udevice *dev;
545
546         dev = _device_find_global_by_of_offset(gd->dm_root, of_offset);
547         return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
548 }
549
550 int device_find_first_child(struct udevice *parent, struct udevice **devp)
551 {
552         if (list_empty(&parent->child_head)) {
553                 *devp = NULL;
554         } else {
555                 *devp = list_first_entry(&parent->child_head, struct udevice,
556                                          sibling_node);
557         }
558
559         return 0;
560 }
561
562 int device_find_next_child(struct udevice **devp)
563 {
564         struct udevice *dev = *devp;
565         struct udevice *parent = dev->parent;
566
567         if (list_is_last(&dev->sibling_node, &parent->child_head)) {
568                 *devp = NULL;
569         } else {
570                 *devp = list_entry(dev->sibling_node.next, struct udevice,
571                                    sibling_node);
572         }
573
574         return 0;
575 }
576
577 struct udevice *dev_get_parent(struct udevice *child)
578 {
579         return child->parent;
580 }
581
582 ulong dev_get_driver_data(struct udevice *dev)
583 {
584         return dev->driver_data;
585 }
586
587 const void *dev_get_driver_ops(struct udevice *dev)
588 {
589         if (!dev || !dev->driver->ops)
590                 return NULL;
591
592         return dev->driver->ops;
593 }
594
595 enum uclass_id device_get_uclass_id(struct udevice *dev)
596 {
597         return dev->uclass->uc_drv->id;
598 }
599
600 const char *dev_get_uclass_name(struct udevice *dev)
601 {
602         if (!dev)
603                 return NULL;
604
605         return dev->uclass->uc_drv->name;
606 }
607
608 fdt_addr_t dev_get_addr_index(struct udevice *dev, int index)
609 {
610 #if CONFIG_IS_ENABLED(OF_CONTROL)
611         fdt_addr_t addr;
612
613         if (CONFIG_IS_ENABLED(OF_TRANSLATE)) {
614                 const fdt32_t *reg;
615                 int len = 0;
616                 int na, ns;
617
618                 na = fdt_address_cells(gd->fdt_blob, dev->parent->of_offset);
619                 if (na < 1) {
620                         debug("bad #address-cells\n");
621                         return FDT_ADDR_T_NONE;
622                 }
623
624                 ns = fdt_size_cells(gd->fdt_blob, dev->parent->of_offset);
625                 if (ns < 0) {
626                         debug("bad #size-cells\n");
627                         return FDT_ADDR_T_NONE;
628                 }
629
630                 reg = fdt_getprop(gd->fdt_blob, dev->of_offset, "reg", &len);
631                 if (!reg || (len <= (index * sizeof(fdt32_t) * (na + ns)))) {
632                         debug("Req index out of range\n");
633                         return FDT_ADDR_T_NONE;
634                 }
635
636                 reg += index * (na + ns);
637
638                 /*
639                  * Use the full-fledged translate function for complex
640                  * bus setups.
641                  */
642                 addr = fdt_translate_address((void *)gd->fdt_blob,
643                                              dev->of_offset, reg);
644         } else {
645                 /*
646                  * Use the "simple" translate function for less complex
647                  * bus setups.
648                  */
649                 addr = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
650                                                         dev->parent->of_offset,
651                                                         dev->of_offset, "reg",
652                                                         index, NULL);
653                 if (CONFIG_IS_ENABLED(SIMPLE_BUS) && addr != FDT_ADDR_T_NONE) {
654                         if (device_get_uclass_id(dev->parent) ==
655                             UCLASS_SIMPLE_BUS)
656                                 addr = simple_bus_translate(dev->parent, addr);
657                 }
658         }
659
660         /*
661          * Some platforms need a special address translation. Those
662          * platforms (e.g. mvebu in SPL) can configure a translation
663          * offset in the DM by calling dm_set_translation_offset() that
664          * will get added to all addresses returned by dev_get_addr().
665          */
666         addr += dm_get_translation_offset();
667
668         return addr;
669 #else
670         return FDT_ADDR_T_NONE;
671 #endif
672 }
673
674 fdt_addr_t dev_get_addr_name(struct udevice *dev, const char *name)
675 {
676 #if CONFIG_IS_ENABLED(OF_CONTROL)
677         int index;
678
679         index = fdt_find_string(gd->fdt_blob, dev->of_offset, "reg-names",
680                                 name);
681         if (index < 0)
682                 return index;
683
684         return dev_get_addr_index(dev, index);
685 #else
686         return FDT_ADDR_T_NONE;
687 #endif
688 }
689
690 fdt_addr_t dev_get_addr(struct udevice *dev)
691 {
692         return dev_get_addr_index(dev, 0);
693 }
694
695 void *dev_get_addr_ptr(struct udevice *dev)
696 {
697         return (void *)(uintptr_t)dev_get_addr_index(dev, 0);
698 }
699
700 bool device_has_children(struct udevice *dev)
701 {
702         return !list_empty(&dev->child_head);
703 }
704
705 bool device_has_active_children(struct udevice *dev)
706 {
707         struct udevice *child;
708
709         for (device_find_first_child(dev, &child);
710              child;
711              device_find_next_child(&child)) {
712                 if (device_active(child))
713                         return true;
714         }
715
716         return false;
717 }
718
719 bool device_is_last_sibling(struct udevice *dev)
720 {
721         struct udevice *parent = dev->parent;
722
723         if (!parent)
724                 return false;
725         return list_is_last(&dev->sibling_node, &parent->child_head);
726 }
727
728 void device_set_name_alloced(struct udevice *dev)
729 {
730         dev->flags |= DM_NAME_ALLOCED;
731 }
732
733 int device_set_name(struct udevice *dev, const char *name)
734 {
735         name = strdup(name);
736         if (!name)
737                 return -ENOMEM;
738         dev->name = name;
739         device_set_name_alloced(dev);
740
741         return 0;
742 }
743
744 bool of_device_is_compatible(struct udevice *dev, const char *compat)
745 {
746         const void *fdt = gd->fdt_blob;
747
748         return !fdt_node_check_compatible(fdt, dev->of_offset, compat);
749 }
750
751 bool of_machine_is_compatible(const char *compat)
752 {
753         const void *fdt = gd->fdt_blob;
754
755         return !fdt_node_check_compatible(fdt, 0, compat);
756 }