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15#define pr_fmt(fmt) "OF: " fmt
16
17#include <linux/errno.h>
18#include <linux/module.h>
19#include <linux/amba/bus.h>
20#include <linux/device.h>
21#include <linux/dma-mapping.h>
22#include <linux/slab.h>
23#include <linux/of_address.h>
24#include <linux/of_device.h>
25#include <linux/of_iommu.h>
26#include <linux/of_irq.h>
27#include <linux/of_platform.h>
28#include <linux/platform_device.h>
29
30const struct of_device_id of_default_bus_match_table[] = {
31 { .compatible = "simple-bus", },
32 { .compatible = "simple-mfd", },
33 { .compatible = "isa", },
34#ifdef CONFIG_ARM_AMBA
35 { .compatible = "arm,amba-bus", },
36#endif
37 {}
38};
39
40static int of_dev_node_match(struct device *dev, void *data)
41{
42 return dev->of_node == data;
43}
44
45
46
47
48
49
50
51
52
53
54struct platform_device *of_find_device_by_node(struct device_node *np)
55{
56 struct device *dev;
57
58 dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match);
59 return dev ? to_platform_device(dev) : NULL;
60}
61EXPORT_SYMBOL(of_find_device_by_node);
62
63#ifdef CONFIG_OF_ADDRESS
64
65
66
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77
78
79
80static void of_device_make_bus_id(struct device *dev)
81{
82 struct device_node *node = dev->of_node;
83 const __be32 *reg;
84 u64 addr;
85
86
87 while (node->parent) {
88
89
90
91
92 reg = of_get_property(node, "reg", NULL);
93 if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) {
94 dev_set_name(dev, dev_name(dev) ? "%llx.%s:%s" : "%llx.%s",
95 (unsigned long long)addr, node->name,
96 dev_name(dev));
97 return;
98 }
99
100
101 dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s",
102 kbasename(node->full_name), dev_name(dev));
103 node = node->parent;
104 }
105}
106
107
108
109
110
111
112
113struct platform_device *of_device_alloc(struct device_node *np,
114 const char *bus_id,
115 struct device *parent)
116{
117 struct platform_device *dev;
118 int rc, i, num_reg = 0, num_irq;
119 struct resource *res, temp_res;
120
121 dev = platform_device_alloc("", PLATFORM_DEVID_NONE);
122 if (!dev)
123 return NULL;
124
125
126 while (of_address_to_resource(np, num_reg, &temp_res) == 0)
127 num_reg++;
128 num_irq = of_irq_count(np);
129
130
131 if (num_irq || num_reg) {
132 res = kzalloc(sizeof(*res) * (num_irq + num_reg), GFP_KERNEL);
133 if (!res) {
134 platform_device_put(dev);
135 return NULL;
136 }
137
138 dev->num_resources = num_reg + num_irq;
139 dev->resource = res;
140 for (i = 0; i < num_reg; i++, res++) {
141 rc = of_address_to_resource(np, i, res);
142 WARN_ON(rc);
143 }
144 if (of_irq_to_resource_table(np, res, num_irq) != num_irq)
145 pr_debug("not all legacy IRQ resources mapped for %s\n",
146 np->name);
147 }
148
149 dev->dev.of_node = of_node_get(np);
150 dev->dev.fwnode = &np->fwnode;
151 dev->dev.parent = parent ? : &platform_bus;
152
153 if (bus_id)
154 dev_set_name(&dev->dev, "%s", bus_id);
155 else
156 of_device_make_bus_id(&dev->dev);
157
158 return dev;
159}
160EXPORT_SYMBOL(of_device_alloc);
161
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170
171
172static struct platform_device *of_platform_device_create_pdata(
173 struct device_node *np,
174 const char *bus_id,
175 void *platform_data,
176 struct device *parent)
177{
178 struct platform_device *dev;
179
180 if (!of_device_is_available(np) ||
181 of_node_test_and_set_flag(np, OF_POPULATED))
182 return NULL;
183
184 dev = of_device_alloc(np, bus_id, parent);
185 if (!dev)
186 goto err_clear_flag;
187
188 dev->dev.bus = &platform_bus_type;
189 dev->dev.platform_data = platform_data;
190 of_msi_configure(&dev->dev, dev->dev.of_node);
191
192 if (of_device_add(dev) != 0) {
193 platform_device_put(dev);
194 goto err_clear_flag;
195 }
196
197 return dev;
198
199err_clear_flag:
200 of_node_clear_flag(np, OF_POPULATED);
201 return NULL;
202}
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211
212
213struct platform_device *of_platform_device_create(struct device_node *np,
214 const char *bus_id,
215 struct device *parent)
216{
217 return of_platform_device_create_pdata(np, bus_id, NULL, parent);
218}
219EXPORT_SYMBOL(of_platform_device_create);
220
221#ifdef CONFIG_ARM_AMBA
222static struct amba_device *of_amba_device_create(struct device_node *node,
223 const char *bus_id,
224 void *platform_data,
225 struct device *parent)
226{
227 struct amba_device *dev;
228 const void *prop;
229 int i, ret;
230
231 pr_debug("Creating amba device %pOF\n", node);
232
233 if (!of_device_is_available(node) ||
234 of_node_test_and_set_flag(node, OF_POPULATED))
235 return NULL;
236
237 dev = amba_device_alloc(NULL, 0, 0);
238 if (!dev)
239 goto err_clear_flag;
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 if (of_node_check_flag(bus, OF_POPULATED_BUS)) {
365 pr_debug("%s() - skipping %pOF, already populated\n",
366 __func__, bus);
367 return 0;
368 }
369
370 auxdata = of_dev_lookup(lookup, bus);
371 if (auxdata) {
372 bus_id = auxdata->name;
373 platform_data = auxdata->platform_data;
374 }
375
376 if (of_device_is_compatible(bus, "arm,primecell")) {
377
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379
380
381 of_amba_device_create(bus, bus_id, platform_data, parent);
382 return 0;
383 }
384
385 dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent);
386 if (!dev || !of_match_node(matches, bus))
387 return 0;
388
389 for_each_child_of_node(bus, child) {
390 pr_debug(" create child: %pOF\n", child);
391 rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);
392 if (rc) {
393 of_node_put(child);
394 break;
395 }
396 }
397 of_node_set_flag(bus, OF_POPULATED_BUS);
398 return rc;
399}
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409
410int of_platform_bus_probe(struct device_node *root,
411 const struct of_device_id *matches,
412 struct device *parent)
413{
414 struct device_node *child;
415 int rc = 0;
416
417 root = root ? of_node_get(root) : of_find_node_by_path("/");
418 if (!root)
419 return -EINVAL;
420
421 pr_debug("%s()\n", __func__);
422 pr_debug(" starting at: %pOF\n", root);
423
424
425 if (of_match_node(matches, root)) {
426 rc = of_platform_bus_create(root, matches, NULL, parent, false);
427 } else for_each_child_of_node(root, child) {
428 if (!of_match_node(matches, child))
429 continue;
430 rc = of_platform_bus_create(child, matches, NULL, parent, false);
431 if (rc) {
432 of_node_put(child);
433 break;
434 }
435 }
436
437 of_node_put(root);
438 return rc;
439}
440EXPORT_SYMBOL(of_platform_bus_probe);
441
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460
461int of_platform_populate(struct device_node *root,
462 const struct of_device_id *matches,
463 const struct of_dev_auxdata *lookup,
464 struct device *parent)
465{
466 struct device_node *child;
467 int rc = 0;
468
469 root = root ? of_node_get(root) : of_find_node_by_path("/");
470 if (!root)
471 return -EINVAL;
472
473 pr_debug("%s()\n", __func__);
474 pr_debug(" starting at: %pOF\n", root);
475
476 for_each_child_of_node(root, child) {
477 rc = of_platform_bus_create(child, matches, lookup, parent, true);
478 if (rc) {
479 of_node_put(child);
480 break;
481 }
482 }
483 of_node_set_flag(root, OF_POPULATED_BUS);
484
485 of_node_put(root);
486 return rc;
487}
488EXPORT_SYMBOL_GPL(of_platform_populate);
489
490int of_platform_default_populate(struct device_node *root,
491 const struct of_dev_auxdata *lookup,
492 struct device *parent)
493{
494 return of_platform_populate(root, of_default_bus_match_table, lookup,
495 parent);
496}
497EXPORT_SYMBOL_GPL(of_platform_default_populate);
498
499#ifndef CONFIG_PPC
500static const struct of_device_id reserved_mem_matches[] = {
501 { .compatible = "qcom,rmtfs-mem" },
502 { .compatible = "ramoops" },
503 {}
504};
505
506static int __init of_platform_default_populate_init(void)
507{
508 struct device_node *node;
509
510 if (!of_have_populated_dt())
511 return -ENODEV;
512
513
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515
516
517
518 for_each_matching_node(node, reserved_mem_matches)
519 of_platform_device_create(node, NULL, NULL);
520
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522 of_platform_default_populate(NULL, NULL, NULL);
523
524 return 0;
525}
526arch_initcall_sync(of_platform_default_populate_init);
527#endif
528
529int of_platform_device_destroy(struct device *dev, void *data)
530{
531
532 if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED))
533 return 0;
534
535
536 if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS))
537 device_for_each_child(dev, NULL, of_platform_device_destroy);
538
539 if (dev->bus == &platform_bus_type)
540 platform_device_unregister(to_platform_device(dev));
541#ifdef CONFIG_ARM_AMBA
542 else if (dev->bus == &amba_bustype)
543 amba_device_unregister(to_amba_device(dev));
544#endif
545
546 of_node_clear_flag(dev->of_node, OF_POPULATED);
547 of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);
548 return 0;
549}
550EXPORT_SYMBOL_GPL(of_platform_device_destroy);
551
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560
561void of_platform_depopulate(struct device *parent)
562{
563 if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) {
564 device_for_each_child(parent, NULL, of_platform_device_destroy);
565 of_node_clear_flag(parent->of_node, OF_POPULATED_BUS);
566 }
567}
568EXPORT_SYMBOL_GPL(of_platform_depopulate);
569
570static void devm_of_platform_populate_release(struct device *dev, void *res)
571{
572 of_platform_depopulate(*(struct device **)res);
573}
574
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583
584int devm_of_platform_populate(struct device *dev)
585{
586 struct device **ptr;
587 int ret;
588
589 if (!dev)
590 return -EINVAL;
591
592 ptr = devres_alloc(devm_of_platform_populate_release,
593 sizeof(*ptr), GFP_KERNEL);
594 if (!ptr)
595 return -ENOMEM;
596
597 ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
598 if (ret) {
599 devres_free(ptr);
600 } else {
601 *ptr = dev;
602 devres_add(dev, ptr);
603 }
604
605 return ret;
606}
607EXPORT_SYMBOL_GPL(devm_of_platform_populate);
608
609static int devm_of_platform_match(struct device *dev, void *res, void *data)
610{
611 struct device **ptr = res;
612
613 if (!ptr) {
614 WARN_ON(!ptr);
615 return 0;
616 }
617
618 return *ptr == data;
619}
620
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629
630void devm_of_platform_depopulate(struct device *dev)
631{
632 int ret;
633
634 ret = devres_release(dev, devm_of_platform_populate_release,
635 devm_of_platform_match, dev);
636
637 WARN_ON(ret);
638}
639EXPORT_SYMBOL_GPL(devm_of_platform_depopulate);
640
641#ifdef CONFIG_OF_DYNAMIC
642static int of_platform_notify(struct notifier_block *nb,
643 unsigned long action, void *arg)
644{
645 struct of_reconfig_data *rd = arg;
646 struct platform_device *pdev_parent, *pdev;
647 bool children_left;
648
649 switch (of_reconfig_get_state_change(action, rd)) {
650 case OF_RECONFIG_CHANGE_ADD:
651
652 if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS))
653 return NOTIFY_OK;
654
655
656 if (of_node_check_flag(rd->dn, OF_POPULATED))
657 return NOTIFY_OK;
658
659
660 pdev_parent = of_find_device_by_node(rd->dn->parent);
661 pdev = of_platform_device_create(rd->dn, NULL,
662 pdev_parent ? &pdev_parent->dev : NULL);
663 of_dev_put(pdev_parent);
664
665 if (pdev == NULL) {
666 pr_err("%s: failed to create for '%pOF'\n",
667 __func__, rd->dn);
668
669 return notifier_from_errno(-EINVAL);
670 }
671 break;
672
673 case OF_RECONFIG_CHANGE_REMOVE:
674
675
676 if (!of_node_check_flag(rd->dn, OF_POPULATED))
677 return NOTIFY_OK;
678
679
680 pdev = of_find_device_by_node(rd->dn);
681 if (pdev == NULL)
682 return NOTIFY_OK;
683
684
685 of_platform_device_destroy(&pdev->dev, &children_left);
686
687
688 of_dev_put(pdev);
689 break;
690 }
691
692 return NOTIFY_OK;
693}
694
695static struct notifier_block platform_of_notifier = {
696 .notifier_call = of_platform_notify,
697};
698
699void of_platform_register_reconfig_notifier(void)
700{
701 WARN_ON(of_reconfig_notifier_register(&platform_of_notifier));
702}
703#endif
704
705#endif
706