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10#define pr_fmt(fmt) "OF: " fmt
11
12#include <linux/errno.h>
13#include <linux/module.h>
14#include <linux/amba/bus.h>
15#include <linux/device.h>
16#include <linux/dma-mapping.h>
17#include <linux/slab.h>
18#include <linux/of_address.h>
19#include <linux/of_device.h>
20#include <linux/of_iommu.h>
21#include <linux/of_irq.h>
22#include <linux/of_platform.h>
23#include <linux/platform_device.h>
24
25const struct of_device_id of_default_bus_match_table[] = {
26 { .compatible = "simple-bus", },
27 { .compatible = "simple-mfd", },
28 { .compatible = "isa", },
29#ifdef CONFIG_ARM_AMBA
30 { .compatible = "arm,amba-bus", },
31#endif
32 {}
33};
34
35static const struct of_device_id of_skipped_node_table[] = {
36 { .compatible = "operating-points-v2", },
37 {}
38};
39
40
41
42
43
44
45
46
47
48
49struct platform_device *of_find_device_by_node(struct device_node *np)
50{
51 struct device *dev;
52
53 dev = bus_find_device_by_of_node(&platform_bus_type, np);
54 return dev ? to_platform_device(dev) : NULL;
55}
56EXPORT_SYMBOL(of_find_device_by_node);
57
58#ifdef CONFIG_OF_ADDRESS
59
60
61
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66
67
68
69
70
71
72
73
74
75static void of_device_make_bus_id(struct device *dev)
76{
77 struct device_node *node = dev->of_node;
78 const __be32 *reg;
79 u64 addr;
80
81
82 while (node->parent) {
83
84
85
86
87 reg = of_get_property(node, "reg", NULL);
88 if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) {
89 dev_set_name(dev, dev_name(dev) ? "%llx.%pOFn:%s" : "%llx.%pOFn",
90 addr, node, dev_name(dev));
91 return;
92 }
93
94
95 dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s",
96 kbasename(node->full_name), dev_name(dev));
97 node = node->parent;
98 }
99}
100
101
102
103
104
105
106
107struct platform_device *of_device_alloc(struct device_node *np,
108 const char *bus_id,
109 struct device *parent)
110{
111 struct platform_device *dev;
112 int rc, i, num_reg = 0, num_irq;
113 struct resource *res, temp_res;
114
115 dev = platform_device_alloc("", PLATFORM_DEVID_NONE);
116 if (!dev)
117 return NULL;
118
119
120 while (of_address_to_resource(np, num_reg, &temp_res) == 0)
121 num_reg++;
122 num_irq = of_irq_count(np);
123
124
125 if (num_irq || num_reg) {
126 res = kcalloc(num_irq + num_reg, sizeof(*res), GFP_KERNEL);
127 if (!res) {
128 platform_device_put(dev);
129 return NULL;
130 }
131
132 dev->num_resources = num_reg + num_irq;
133 dev->resource = res;
134 for (i = 0; i < num_reg; i++, res++) {
135 rc = of_address_to_resource(np, i, res);
136 WARN_ON(rc);
137 }
138 if (of_irq_to_resource_table(np, res, num_irq) != num_irq)
139 pr_debug("not all legacy IRQ resources mapped for %pOFn\n",
140 np);
141 }
142
143 dev->dev.of_node = of_node_get(np);
144 dev->dev.fwnode = &np->fwnode;
145 dev->dev.parent = parent ? : &platform_bus;
146
147 if (bus_id)
148 dev_set_name(&dev->dev, "%s", bus_id);
149 else
150 of_device_make_bus_id(&dev->dev);
151
152 return dev;
153}
154EXPORT_SYMBOL(of_device_alloc);
155
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162
163
164
165
166static struct platform_device *of_platform_device_create_pdata(
167 struct device_node *np,
168 const char *bus_id,
169 void *platform_data,
170 struct device *parent)
171{
172 struct platform_device *dev;
173
174 if (!of_device_is_available(np) ||
175 of_node_test_and_set_flag(np, OF_POPULATED))
176 return NULL;
177
178 dev = of_device_alloc(np, bus_id, parent);
179 if (!dev)
180 goto err_clear_flag;
181
182 dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
183 if (!dev->dev.dma_mask)
184 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
185 dev->dev.bus = &platform_bus_type;
186 dev->dev.platform_data = platform_data;
187 of_msi_configure(&dev->dev, dev->dev.of_node);
188
189 if (of_device_add(dev) != 0) {
190 platform_device_put(dev);
191 goto err_clear_flag;
192 }
193
194 return dev;
195
196err_clear_flag:
197 of_node_clear_flag(np, OF_POPULATED);
198 return NULL;
199}
200
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208
209
210struct platform_device *of_platform_device_create(struct device_node *np,
211 const char *bus_id,
212 struct device *parent)
213{
214 return of_platform_device_create_pdata(np, bus_id, NULL, parent);
215}
216EXPORT_SYMBOL(of_platform_device_create);
217
218#ifdef CONFIG_ARM_AMBA
219static struct amba_device *of_amba_device_create(struct device_node *node,
220 const char *bus_id,
221 void *platform_data,
222 struct device *parent)
223{
224 struct amba_device *dev;
225 const void *prop;
226 int i, ret;
227
228 pr_debug("Creating amba device %pOF\n", node);
229
230 if (!of_device_is_available(node) ||
231 of_node_test_and_set_flag(node, OF_POPULATED))
232 return NULL;
233
234 dev = amba_device_alloc(NULL, 0, 0);
235 if (!dev)
236 goto err_clear_flag;
237
238
239 dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
240 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
241
242
243 dev->dev.of_node = of_node_get(node);
244 dev->dev.fwnode = &node->fwnode;
245 dev->dev.parent = parent ? : &platform_bus;
246 dev->dev.platform_data = platform_data;
247 if (bus_id)
248 dev_set_name(&dev->dev, "%s", bus_id);
249 else
250 of_device_make_bus_id(&dev->dev);
251
252
253 prop = of_get_property(node, "arm,primecell-periphid", NULL);
254 if (prop)
255 dev->periphid = of_read_ulong(prop, 1);
256
257
258 for (i = 0; i < AMBA_NR_IRQS; i++)
259 dev->irq[i] = irq_of_parse_and_map(node, i);
260
261 ret = of_address_to_resource(node, 0, &dev->res);
262 if (ret) {
263 pr_err("amba: of_address_to_resource() failed (%d) for %pOF\n",
264 ret, node);
265 goto err_free;
266 }
267
268 ret = amba_device_add(dev, &iomem_resource);
269 if (ret) {
270 pr_err("amba_device_add() failed (%d) for %pOF\n",
271 ret, node);
272 goto err_free;
273 }
274
275 return dev;
276
277err_free:
278 amba_device_put(dev);
279err_clear_flag:
280 of_node_clear_flag(node, OF_POPULATED);
281 return NULL;
282}
283#else
284static struct amba_device *of_amba_device_create(struct device_node *node,
285 const char *bus_id,
286 void *platform_data,
287 struct device *parent)
288{
289 return NULL;
290}
291#endif
292
293
294
295
296static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup,
297 struct device_node *np)
298{
299 const struct of_dev_auxdata *auxdata;
300 struct resource res;
301 int compatible = 0;
302
303 if (!lookup)
304 return NULL;
305
306 auxdata = lookup;
307 for (; auxdata->compatible; auxdata++) {
308 if (!of_device_is_compatible(np, auxdata->compatible))
309 continue;
310 compatible++;
311 if (!of_address_to_resource(np, 0, &res))
312 if (res.start != auxdata->phys_addr)
313 continue;
314 pr_debug("%pOF: devname=%s\n", np, auxdata->name);
315 return auxdata;
316 }
317
318 if (!compatible)
319 return NULL;
320
321
322 auxdata = lookup;
323 for (; auxdata->compatible; auxdata++) {
324 if (!of_device_is_compatible(np, auxdata->compatible))
325 continue;
326 if (!auxdata->phys_addr && !auxdata->name) {
327 pr_debug("%pOF: compatible match\n", np);
328 return auxdata;
329 }
330 }
331
332 return NULL;
333}
334
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345
346static int of_platform_bus_create(struct device_node *bus,
347 const struct of_device_id *matches,
348 const struct of_dev_auxdata *lookup,
349 struct device *parent, bool strict)
350{
351 const struct of_dev_auxdata *auxdata;
352 struct device_node *child;
353 struct platform_device *dev;
354 const char *bus_id = NULL;
355 void *platform_data = NULL;
356 int rc = 0;
357
358
359 if (strict && (!of_get_property(bus, "compatible", NULL))) {
360 pr_debug("%s() - skipping %pOF, no compatible prop\n",
361 __func__, bus);
362 return 0;
363 }
364
365
366 if (unlikely(of_match_node(of_skipped_node_table, bus))) {
367 pr_debug("%s() - skipping %pOF node\n", __func__, bus);
368 return 0;
369 }
370
371 if (of_node_check_flag(bus, OF_POPULATED_BUS)) {
372 pr_debug("%s() - skipping %pOF, already populated\n",
373 __func__, bus);
374 return 0;
375 }
376
377 auxdata = of_dev_lookup(lookup, bus);
378 if (auxdata) {
379 bus_id = auxdata->name;
380 platform_data = auxdata->platform_data;
381 }
382
383 if (of_device_is_compatible(bus, "arm,primecell")) {
384
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386
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388 of_amba_device_create(bus, bus_id, platform_data, parent);
389 return 0;
390 }
391
392 dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent);
393 if (!dev || !of_match_node(matches, bus))
394 return 0;
395
396 for_each_child_of_node(bus, child) {
397 pr_debug(" create child: %pOF\n", child);
398 rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);
399 if (rc) {
400 of_node_put(child);
401 break;
402 }
403 }
404 of_node_set_flag(bus, OF_POPULATED_BUS);
405 return rc;
406}
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415
416
417int of_platform_bus_probe(struct device_node *root,
418 const struct of_device_id *matches,
419 struct device *parent)
420{
421 struct device_node *child;
422 int rc = 0;
423
424 root = root ? of_node_get(root) : of_find_node_by_path("/");
425 if (!root)
426 return -EINVAL;
427
428 pr_debug("%s()\n", __func__);
429 pr_debug(" starting at: %pOF\n", root);
430
431
432 if (of_match_node(matches, root)) {
433 rc = of_platform_bus_create(root, matches, NULL, parent, false);
434 } else for_each_child_of_node(root, child) {
435 if (!of_match_node(matches, child))
436 continue;
437 rc = of_platform_bus_create(child, matches, NULL, parent, false);
438 if (rc) {
439 of_node_put(child);
440 break;
441 }
442 }
443
444 of_node_put(root);
445 return rc;
446}
447EXPORT_SYMBOL(of_platform_bus_probe);
448
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467
468int of_platform_populate(struct device_node *root,
469 const struct of_device_id *matches,
470 const struct of_dev_auxdata *lookup,
471 struct device *parent)
472{
473 struct device_node *child;
474 int rc = 0;
475
476 root = root ? of_node_get(root) : of_find_node_by_path("/");
477 if (!root)
478 return -EINVAL;
479
480 pr_debug("%s()\n", __func__);
481 pr_debug(" starting at: %pOF\n", root);
482
483 device_links_supplier_sync_state_pause();
484 for_each_child_of_node(root, child) {
485 rc = of_platform_bus_create(child, matches, lookup, parent, true);
486 if (rc) {
487 of_node_put(child);
488 break;
489 }
490 }
491 device_links_supplier_sync_state_resume();
492
493 of_node_set_flag(root, OF_POPULATED_BUS);
494
495 of_node_put(root);
496 return rc;
497}
498EXPORT_SYMBOL_GPL(of_platform_populate);
499
500int of_platform_default_populate(struct device_node *root,
501 const struct of_dev_auxdata *lookup,
502 struct device *parent)
503{
504 return of_platform_populate(root, of_default_bus_match_table, lookup,
505 parent);
506}
507EXPORT_SYMBOL_GPL(of_platform_default_populate);
508
509#ifndef CONFIG_PPC
510static const struct of_device_id reserved_mem_matches[] = {
511 { .compatible = "qcom,rmtfs-mem" },
512 { .compatible = "qcom,cmd-db" },
513 { .compatible = "ramoops" },
514 {}
515};
516
517static int __init of_platform_default_populate_init(void)
518{
519 struct device_node *node;
520
521 device_links_supplier_sync_state_pause();
522
523 if (!of_have_populated_dt())
524 return -ENODEV;
525
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527
528
529
530
531 for_each_matching_node(node, reserved_mem_matches)
532 of_platform_device_create(node, NULL, NULL);
533
534 node = of_find_node_by_path("/firmware");
535 if (node) {
536 of_platform_populate(node, NULL, NULL, NULL);
537 of_node_put(node);
538 }
539
540
541 of_platform_default_populate(NULL, NULL, NULL);
542
543 return 0;
544}
545arch_initcall_sync(of_platform_default_populate_init);
546
547static int __init of_platform_sync_state_init(void)
548{
549 device_links_supplier_sync_state_resume();
550 return 0;
551}
552late_initcall_sync(of_platform_sync_state_init);
553#endif
554
555int of_platform_device_destroy(struct device *dev, void *data)
556{
557
558 if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED))
559 return 0;
560
561
562 if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS))
563 device_for_each_child(dev, NULL, of_platform_device_destroy);
564
565 of_node_clear_flag(dev->of_node, OF_POPULATED);
566 of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);
567
568 if (dev->bus == &platform_bus_type)
569 platform_device_unregister(to_platform_device(dev));
570#ifdef CONFIG_ARM_AMBA
571 else if (dev->bus == &amba_bustype)
572 amba_device_unregister(to_amba_device(dev));
573#endif
574
575 return 0;
576}
577EXPORT_SYMBOL_GPL(of_platform_device_destroy);
578
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586
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588void of_platform_depopulate(struct device *parent)
589{
590 if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) {
591 device_for_each_child_reverse(parent, NULL, of_platform_device_destroy);
592 of_node_clear_flag(parent->of_node, OF_POPULATED_BUS);
593 }
594}
595EXPORT_SYMBOL_GPL(of_platform_depopulate);
596
597static void devm_of_platform_populate_release(struct device *dev, void *res)
598{
599 of_platform_depopulate(*(struct device **)res);
600}
601
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609
610
611int devm_of_platform_populate(struct device *dev)
612{
613 struct device **ptr;
614 int ret;
615
616 if (!dev)
617 return -EINVAL;
618
619 ptr = devres_alloc(devm_of_platform_populate_release,
620 sizeof(*ptr), GFP_KERNEL);
621 if (!ptr)
622 return -ENOMEM;
623
624 ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
625 if (ret) {
626 devres_free(ptr);
627 } else {
628 *ptr = dev;
629 devres_add(dev, ptr);
630 }
631
632 return ret;
633}
634EXPORT_SYMBOL_GPL(devm_of_platform_populate);
635
636static int devm_of_platform_match(struct device *dev, void *res, void *data)
637{
638 struct device **ptr = res;
639
640 if (!ptr) {
641 WARN_ON(!ptr);
642 return 0;
643 }
644
645 return *ptr == data;
646}
647
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653
654
655
656
657void devm_of_platform_depopulate(struct device *dev)
658{
659 int ret;
660
661 ret = devres_release(dev, devm_of_platform_populate_release,
662 devm_of_platform_match, dev);
663
664 WARN_ON(ret);
665}
666EXPORT_SYMBOL_GPL(devm_of_platform_depopulate);
667
668#ifdef CONFIG_OF_DYNAMIC
669static int of_platform_notify(struct notifier_block *nb,
670 unsigned long action, void *arg)
671{
672 struct of_reconfig_data *rd = arg;
673 struct platform_device *pdev_parent, *pdev;
674 bool children_left;
675
676 switch (of_reconfig_get_state_change(action, rd)) {
677 case OF_RECONFIG_CHANGE_ADD:
678
679 if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS))
680 return NOTIFY_OK;
681
682
683 if (of_node_check_flag(rd->dn, OF_POPULATED))
684 return NOTIFY_OK;
685
686
687 pdev_parent = of_find_device_by_node(rd->dn->parent);
688 pdev = of_platform_device_create(rd->dn, NULL,
689 pdev_parent ? &pdev_parent->dev : NULL);
690 of_dev_put(pdev_parent);
691
692 if (pdev == NULL) {
693 pr_err("%s: failed to create for '%pOF'\n",
694 __func__, rd->dn);
695
696 return notifier_from_errno(-EINVAL);
697 }
698 break;
699
700 case OF_RECONFIG_CHANGE_REMOVE:
701
702
703 if (!of_node_check_flag(rd->dn, OF_POPULATED))
704 return NOTIFY_OK;
705
706
707 pdev = of_find_device_by_node(rd->dn);
708 if (pdev == NULL)
709 return NOTIFY_OK;
710
711
712 of_platform_device_destroy(&pdev->dev, &children_left);
713
714
715 of_dev_put(pdev);
716 break;
717 }
718
719 return NOTIFY_OK;
720}
721
722static struct notifier_block platform_of_notifier = {
723 .notifier_call = of_platform_notify,
724};
725
726void of_platform_register_reconfig_notifier(void)
727{
728 WARN_ON(of_reconfig_notifier_register(&platform_of_notifier));
729}
730#endif
731
732#endif
733