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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_irq.h>
21#include <linux/of_platform.h>
22#include <linux/platform_device.h>
23
24const struct of_device_id of_default_bus_match_table[] = {
25 { .compatible = "simple-bus", },
26 { .compatible = "simple-mfd", },
27 { .compatible = "isa", },
28#ifdef CONFIG_ARM_AMBA
29 { .compatible = "arm,amba-bus", },
30#endif
31 {}
32};
33
34static const struct of_device_id of_skipped_node_table[] = {
35 { .compatible = "operating-points-v2", },
36 {}
37};
38
39
40
41
42
43
44
45
46
47
48struct platform_device *of_find_device_by_node(struct device_node *np)
49{
50 struct device *dev;
51
52 dev = bus_find_device_by_of_node(&platform_bus_type, np);
53 return dev ? to_platform_device(dev) : NULL;
54}
55EXPORT_SYMBOL(of_find_device_by_node);
56
57#ifdef CONFIG_OF_ADDRESS
58
59
60
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66
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70
71
72
73
74static void of_device_make_bus_id(struct device *dev)
75{
76 struct device_node *node = dev->of_node;
77 const __be32 *reg;
78 u64 addr;
79
80
81 while (node->parent) {
82
83
84
85
86 reg = of_get_property(node, "reg", NULL);
87 if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) {
88 dev_set_name(dev, dev_name(dev) ? "%llx.%pOFn:%s" : "%llx.%pOFn",
89 addr, node, dev_name(dev));
90 return;
91 }
92
93
94 dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s",
95 kbasename(node->full_name), dev_name(dev));
96 node = node->parent;
97 }
98}
99
100
101
102
103
104
105
106struct platform_device *of_device_alloc(struct device_node *np,
107 const char *bus_id,
108 struct device *parent)
109{
110 struct platform_device *dev;
111 int rc, i, num_reg = 0, num_irq;
112 struct resource *res, temp_res;
113
114 dev = platform_device_alloc("", PLATFORM_DEVID_NONE);
115 if (!dev)
116 return NULL;
117
118
119 while (of_address_to_resource(np, num_reg, &temp_res) == 0)
120 num_reg++;
121 num_irq = of_irq_count(np);
122
123
124 if (num_irq || num_reg) {
125 res = kcalloc(num_irq + num_reg, sizeof(*res), GFP_KERNEL);
126 if (!res) {
127 platform_device_put(dev);
128 return NULL;
129 }
130
131 dev->num_resources = num_reg + num_irq;
132 dev->resource = res;
133 for (i = 0; i < num_reg; i++, res++) {
134 rc = of_address_to_resource(np, i, res);
135 WARN_ON(rc);
136 }
137 if (of_irq_to_resource_table(np, res, num_irq) != num_irq)
138 pr_debug("not all legacy IRQ resources mapped for %pOFn\n",
139 np);
140 }
141
142 dev->dev.of_node = of_node_get(np);
143 dev->dev.fwnode = &np->fwnode;
144 dev->dev.parent = parent ? : &platform_bus;
145
146 if (bus_id)
147 dev_set_name(&dev->dev, "%s", bus_id);
148 else
149 of_device_make_bus_id(&dev->dev);
150
151 return dev;
152}
153EXPORT_SYMBOL(of_device_alloc);
154
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162
163
164
165static struct platform_device *of_platform_device_create_pdata(
166 struct device_node *np,
167 const char *bus_id,
168 void *platform_data,
169 struct device *parent)
170{
171 struct platform_device *dev;
172
173 if (!of_device_is_available(np) ||
174 of_node_test_and_set_flag(np, OF_POPULATED))
175 return NULL;
176
177 dev = of_device_alloc(np, bus_id, parent);
178 if (!dev)
179 goto err_clear_flag;
180
181 dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
182 if (!dev->dev.dma_mask)
183 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
184 dev->dev.bus = &platform_bus_type;
185 dev->dev.platform_data = platform_data;
186 of_msi_configure(&dev->dev, dev->dev.of_node);
187
188 if (of_device_add(dev) != 0) {
189 platform_device_put(dev);
190 goto err_clear_flag;
191 }
192
193 return dev;
194
195err_clear_flag:
196 of_node_clear_flag(np, OF_POPULATED);
197 return NULL;
198}
199
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207
208
209struct platform_device *of_platform_device_create(struct device_node *np,
210 const char *bus_id,
211 struct device *parent)
212{
213 return of_platform_device_create_pdata(np, bus_id, NULL, parent);
214}
215EXPORT_SYMBOL(of_platform_device_create);
216
217#ifdef CONFIG_ARM_AMBA
218static struct amba_device *of_amba_device_create(struct device_node *node,
219 const char *bus_id,
220 void *platform_data,
221 struct device *parent)
222{
223 struct amba_device *dev;
224 const void *prop;
225 int i, ret;
226
227 pr_debug("Creating amba device %pOF\n", node);
228
229 if (!of_device_is_available(node) ||
230 of_node_test_and_set_flag(node, OF_POPULATED))
231 return NULL;
232
233 dev = amba_device_alloc(NULL, 0, 0);
234 if (!dev)
235 goto err_clear_flag;
236
237
238 dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
239 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
240
241
242 dev->dev.of_node = of_node_get(node);
243 dev->dev.fwnode = &node->fwnode;
244 dev->dev.parent = parent ? : &platform_bus;
245 dev->dev.platform_data = platform_data;
246 if (bus_id)
247 dev_set_name(&dev->dev, "%s", bus_id);
248 else
249 of_device_make_bus_id(&dev->dev);
250
251
252 prop = of_get_property(node, "arm,primecell-periphid", NULL);
253 if (prop)
254 dev->periphid = of_read_ulong(prop, 1);
255
256
257 for (i = 0; i < AMBA_NR_IRQS; i++)
258 dev->irq[i] = irq_of_parse_and_map(node, i);
259
260 ret = of_address_to_resource(node, 0, &dev->res);
261 if (ret) {
262 pr_err("amba: of_address_to_resource() failed (%d) for %pOF\n",
263 ret, node);
264 goto err_free;
265 }
266
267 ret = amba_device_add(dev, &iomem_resource);
268 if (ret) {
269 pr_err("amba_device_add() failed (%d) for %pOF\n",
270 ret, node);
271 goto err_free;
272 }
273
274 return dev;
275
276err_free:
277 amba_device_put(dev);
278err_clear_flag:
279 of_node_clear_flag(node, OF_POPULATED);
280 return NULL;
281}
282#else
283static struct amba_device *of_amba_device_create(struct device_node *node,
284 const char *bus_id,
285 void *platform_data,
286 struct device *parent)
287{
288 return NULL;
289}
290#endif
291
292
293
294
295static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup,
296 struct device_node *np)
297{
298 const struct of_dev_auxdata *auxdata;
299 struct resource res;
300 int compatible = 0;
301
302 if (!lookup)
303 return NULL;
304
305 auxdata = lookup;
306 for (; auxdata->compatible; auxdata++) {
307 if (!of_device_is_compatible(np, auxdata->compatible))
308 continue;
309 compatible++;
310 if (!of_address_to_resource(np, 0, &res))
311 if (res.start != auxdata->phys_addr)
312 continue;
313 pr_debug("%pOF: devname=%s\n", np, auxdata->name);
314 return auxdata;
315 }
316
317 if (!compatible)
318 return NULL;
319
320
321 auxdata = lookup;
322 for (; auxdata->compatible; auxdata++) {
323 if (!of_device_is_compatible(np, auxdata->compatible))
324 continue;
325 if (!auxdata->phys_addr && !auxdata->name) {
326 pr_debug("%pOF: compatible match\n", np);
327 return auxdata;
328 }
329 }
330
331 return NULL;
332}
333
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344
345static int of_platform_bus_create(struct device_node *bus,
346 const struct of_device_id *matches,
347 const struct of_dev_auxdata *lookup,
348 struct device *parent, bool strict)
349{
350 const struct of_dev_auxdata *auxdata;
351 struct device_node *child;
352 struct platform_device *dev;
353 const char *bus_id = NULL;
354 void *platform_data = NULL;
355 int rc = 0;
356
357
358 if (strict && (!of_get_property(bus, "compatible", NULL))) {
359 pr_debug("%s() - skipping %pOF, no compatible prop\n",
360 __func__, bus);
361 return 0;
362 }
363
364
365 if (unlikely(of_match_node(of_skipped_node_table, bus))) {
366 pr_debug("%s() - skipping %pOF node\n", __func__, bus);
367 return 0;
368 }
369
370 if (of_node_check_flag(bus, OF_POPULATED_BUS)) {
371 pr_debug("%s() - skipping %pOF, already populated\n",
372 __func__, bus);
373 return 0;
374 }
375
376 auxdata = of_dev_lookup(lookup, bus);
377 if (auxdata) {
378 bus_id = auxdata->name;
379 platform_data = auxdata->platform_data;
380 }
381
382 if (of_device_is_compatible(bus, "arm,primecell")) {
383
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387 of_amba_device_create(bus, bus_id, platform_data, parent);
388 return 0;
389 }
390
391 dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent);
392 if (!dev || !of_match_node(matches, bus))
393 return 0;
394
395 for_each_child_of_node(bus, child) {
396 pr_debug(" create child: %pOF\n", child);
397 rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);
398 if (rc) {
399 of_node_put(child);
400 break;
401 }
402 }
403 of_node_set_flag(bus, OF_POPULATED_BUS);
404 return rc;
405}
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415
416int of_platform_bus_probe(struct device_node *root,
417 const struct of_device_id *matches,
418 struct device *parent)
419{
420 struct device_node *child;
421 int rc = 0;
422
423 root = root ? of_node_get(root) : of_find_node_by_path("/");
424 if (!root)
425 return -EINVAL;
426
427 pr_debug("%s()\n", __func__);
428 pr_debug(" starting at: %pOF\n", root);
429
430
431 if (of_match_node(matches, root)) {
432 rc = of_platform_bus_create(root, matches, NULL, parent, false);
433 } else for_each_child_of_node(root, child) {
434 if (!of_match_node(matches, child))
435 continue;
436 rc = of_platform_bus_create(child, matches, NULL, parent, false);
437 if (rc) {
438 of_node_put(child);
439 break;
440 }
441 }
442
443 of_node_put(root);
444 return rc;
445}
446EXPORT_SYMBOL(of_platform_bus_probe);
447
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466
467int of_platform_populate(struct device_node *root,
468 const struct of_device_id *matches,
469 const struct of_dev_auxdata *lookup,
470 struct device *parent)
471{
472 struct device_node *child;
473 int rc = 0;
474
475 root = root ? of_node_get(root) : of_find_node_by_path("/");
476 if (!root)
477 return -EINVAL;
478
479 pr_debug("%s()\n", __func__);
480 pr_debug(" starting at: %pOF\n", root);
481
482 device_links_supplier_sync_state_pause();
483 for_each_child_of_node(root, child) {
484 rc = of_platform_bus_create(child, matches, lookup, parent, true);
485 if (rc) {
486 of_node_put(child);
487 break;
488 }
489 }
490 device_links_supplier_sync_state_resume();
491
492 of_node_set_flag(root, OF_POPULATED_BUS);
493
494 of_node_put(root);
495 return rc;
496}
497EXPORT_SYMBOL_GPL(of_platform_populate);
498
499int of_platform_default_populate(struct device_node *root,
500 const struct of_dev_auxdata *lookup,
501 struct device *parent)
502{
503 return of_platform_populate(root, of_default_bus_match_table, lookup,
504 parent);
505}
506EXPORT_SYMBOL_GPL(of_platform_default_populate);
507
508#ifndef CONFIG_PPC
509static const struct of_device_id reserved_mem_matches[] = {
510 { .compatible = "qcom,rmtfs-mem" },
511 { .compatible = "qcom,cmd-db" },
512 { .compatible = "ramoops" },
513 { .compatible = "nvmem-rmem" },
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
526
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 platform_device_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 platform_device_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