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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
4 * <benh@kernel.crashing.org>
5 * and Arnd Bergmann, IBM Corp.
6 * Merged from powerpc/kernel/of_platform.c and
7 * sparc{,64}/kernel/of_device.c by Stephen Rothwell
8 */
9
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 /* CONFIG_ARM_AMBA */
32 {} /* Empty terminated list */
33};
34
35static const struct of_device_id of_skipped_node_table[] = {
36 { .compatible = "operating-points-v2", },
37 {} /* Empty terminated list */
38};
39
40/**
41 * of_find_device_by_node - Find the platform_device associated with a node
42 * @np: Pointer to device tree node
43 *
44 * Takes a reference to the embedded struct device which needs to be dropped
45 * after use.
46 *
47 * Returns platform_device pointer, or NULL if not found
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 * The following routines scan a subtree and registers a device for
61 * each applicable node.
62 *
63 * Note: sparc doesn't use these routines because it has a different
64 * mechanism for creating devices from device tree nodes.
65 */
66
67/**
68 * of_device_make_bus_id - Use the device node data to assign a unique name
69 * @dev: pointer to device structure that is linked to a device tree node
70 *
71 * This routine will first try using the translated bus address to
72 * derive a unique name. If it cannot, then it will prepend names from
73 * parent nodes until a unique name can be derived.
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 /* Construct the name, using parent nodes if necessary to ensure uniqueness */
82 while (node->parent) {
83 /*
84 * If the address can be translated, then that is as much
85 * uniqueness as we need. Make it the first component and return
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 /* format arguments only used if dev_name() resolves to NULL */
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 * of_device_alloc - Allocate and initialize an of_device
103 * @np: device node to assign to device
104 * @bus_id: Name to assign to the device. May be null to use default name.
105 * @parent: Parent device.
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 /* count the io and irq resources */
120 while (of_address_to_resource(np, num_reg, &temp_res) == 0)
121 num_reg++;
122 num_irq = of_irq_count(np);
123
124 /* Populate the resource table */
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
156/**
157 * of_platform_device_create_pdata - Alloc, initialize and register an of_device
158 * @np: pointer to node to create device for
159 * @bus_id: name to assign device
160 * @platform_data: pointer to populate platform_data pointer with
161 * @parent: Linux device model parent device.
162 *
163 * Returns pointer to created platform device, or NULL if a device was not
164 * registered. Unavailable devices will not get registered.
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
201/**
202 * of_platform_device_create - Alloc, initialize and register an of_device
203 * @np: pointer to node to create device for
204 * @bus_id: name to assign device
205 * @parent: Linux device model parent device.
206 *
207 * Returns pointer to created platform device, or NULL if a device was not
208 * registered. Unavailable devices will not get registered.
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 /* AMBA devices only support a single DMA mask */
239 dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
240 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
241
242 /* setup generic device info */
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 /* Allow the HW Peripheral ID to be overridden */
253 prop = of_get_property(node, "arm,primecell-periphid", NULL);
254 if (prop)
255 dev->periphid = of_read_ulong(prop, 1);
256
257 /* Decode the IRQs and address ranges */
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 /* CONFIG_ARM_AMBA */
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 /* CONFIG_ARM_AMBA */
292
293/**
294 * of_devname_lookup() - Given a device node, lookup the preferred Linux name
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 /* Try compatible match if no phys_addr and name are specified */
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
335/**
336 * of_platform_bus_create() - Create a device for a node and its children.
337 * @bus: device node of the bus to instantiate
338 * @matches: match table for bus nodes
339 * @lookup: auxdata table for matching id and platform_data with device nodes
340 * @parent: parent for new device, or NULL for top level.
341 * @strict: require compatible property
342 *
343 * Creates a platform_device for the provided device_node, and optionally
344 * recursively create devices for all the child nodes.
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 /* Make sure it has a compatible property */
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 /* Skip nodes for which we don't want to create devices */
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 /*
385 * Don't return an error here to keep compatibility with older
386 * device tree files.
387 */
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}
407
408/**
409 * of_platform_bus_probe() - Probe the device-tree for platform buses
410 * @root: parent of the first level to probe or NULL for the root of the tree
411 * @matches: match table for bus nodes
412 * @parent: parent to hook devices from, NULL for toplevel
413 *
414 * Note that children of the provided root are not instantiated as devices
415 * unless the specified root itself matches the bus list and is not NULL.
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 /* Do a self check of bus type, if there's a match, create children */
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
449/**
450 * of_platform_populate() - Populate platform_devices from device tree data
451 * @root: parent of the first level to probe or NULL for the root of the tree
452 * @matches: match table, NULL to use the default
453 * @lookup: auxdata table for matching id and platform_data with device nodes
454 * @parent: parent to hook devices from, NULL for toplevel
455 *
456 * Similar to of_platform_bus_probe(), this function walks the device tree
457 * and creates devices from nodes. It differs in that it follows the modern
458 * convention of requiring all device nodes to have a 'compatible' property,
459 * and it is suitable for creating devices which are children of the root
460 * node (of_platform_bus_probe will only create children of the root which
461 * are selected by the @matches argument).
462 *
463 * New board support should be using this function instead of
464 * of_platform_bus_probe().
465 *
466 * Returns 0 on success, < 0 on failure.
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 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 of_node_set_flag(root, OF_POPULATED_BUS);
491
492 of_node_put(root);
493 return rc;
494}
495EXPORT_SYMBOL_GPL(of_platform_populate);
496
497int of_platform_default_populate(struct device_node *root,
498 const struct of_dev_auxdata *lookup,
499 struct device *parent)
500{
501 return of_platform_populate(root, of_default_bus_match_table, lookup,
502 parent);
503}
504EXPORT_SYMBOL_GPL(of_platform_default_populate);
505
506#ifndef CONFIG_PPC
507static const struct of_device_id reserved_mem_matches[] = {
508 { .compatible = "qcom,rmtfs-mem" },
509 { .compatible = "qcom,cmd-db" },
510 { .compatible = "ramoops" },
511 {}
512};
513
514static int __init of_platform_default_populate_init(void)
515{
516 struct device_node *node;
517
518 if (!of_have_populated_dt())
519 return -ENODEV;
520
521 /*
522 * Handle certain compatibles explicitly, since we don't want to create
523 * platform_devices for every node in /reserved-memory with a
524 * "compatible",
525 */
526 for_each_matching_node(node, reserved_mem_matches)
527 of_platform_device_create(node, NULL, NULL);
528
529 node = of_find_node_by_path("/firmware");
530 if (node) {
531 of_platform_populate(node, NULL, NULL, NULL);
532 of_node_put(node);
533 }
534
535 /* Populate everything else. */
536 of_platform_default_populate(NULL, NULL, NULL);
537
538 return 0;
539}
540arch_initcall_sync(of_platform_default_populate_init);
541#endif
542
543int of_platform_device_destroy(struct device *dev, void *data)
544{
545 /* Do not touch devices not populated from the device tree */
546 if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED))
547 return 0;
548
549 /* Recurse for any nodes that were treated as busses */
550 if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS))
551 device_for_each_child(dev, NULL, of_platform_device_destroy);
552
553 of_node_clear_flag(dev->of_node, OF_POPULATED);
554 of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);
555
556 if (dev->bus == &platform_bus_type)
557 platform_device_unregister(to_platform_device(dev));
558#ifdef CONFIG_ARM_AMBA
559 else if (dev->bus == &amba_bustype)
560 amba_device_unregister(to_amba_device(dev));
561#endif
562
563 return 0;
564}
565EXPORT_SYMBOL_GPL(of_platform_device_destroy);
566
567/**
568 * of_platform_depopulate() - Remove devices populated from device tree
569 * @parent: device which children will be removed
570 *
571 * Complementary to of_platform_populate(), this function removes children
572 * of the given device (and, recurrently, their children) that have been
573 * created from their respective device tree nodes (and only those,
574 * leaving others - eg. manually created - unharmed).
575 */
576void of_platform_depopulate(struct device *parent)
577{
578 if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) {
579 device_for_each_child(parent, NULL, of_platform_device_destroy);
580 of_node_clear_flag(parent->of_node, OF_POPULATED_BUS);
581 }
582}
583EXPORT_SYMBOL_GPL(of_platform_depopulate);
584
585static void devm_of_platform_populate_release(struct device *dev, void *res)
586{
587 of_platform_depopulate(*(struct device **)res);
588}
589
590/**
591 * devm_of_platform_populate() - Populate platform_devices from device tree data
592 * @dev: device that requested to populate from device tree data
593 *
594 * Similar to of_platform_populate(), but will automatically call
595 * of_platform_depopulate() when the device is unbound from the bus.
596 *
597 * Returns 0 on success, < 0 on failure.
598 */
599int devm_of_platform_populate(struct device *dev)
600{
601 struct device **ptr;
602 int ret;
603
604 if (!dev)
605 return -EINVAL;
606
607 ptr = devres_alloc(devm_of_platform_populate_release,
608 sizeof(*ptr), GFP_KERNEL);
609 if (!ptr)
610 return -ENOMEM;
611
612 ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
613 if (ret) {
614 devres_free(ptr);
615 } else {
616 *ptr = dev;
617 devres_add(dev, ptr);
618 }
619
620 return ret;
621}
622EXPORT_SYMBOL_GPL(devm_of_platform_populate);
623
624static int devm_of_platform_match(struct device *dev, void *res, void *data)
625{
626 struct device **ptr = res;
627
628 if (!ptr) {
629 WARN_ON(!ptr);
630 return 0;
631 }
632
633 return *ptr == data;
634}
635
636/**
637 * devm_of_platform_depopulate() - Remove devices populated from device tree
638 * @dev: device that requested to depopulate from device tree data
639 *
640 * Complementary to devm_of_platform_populate(), this function removes children
641 * of the given device (and, recurrently, their children) that have been
642 * created from their respective device tree nodes (and only those,
643 * leaving others - eg. manually created - unharmed).
644 */
645void devm_of_platform_depopulate(struct device *dev)
646{
647 int ret;
648
649 ret = devres_release(dev, devm_of_platform_populate_release,
650 devm_of_platform_match, dev);
651
652 WARN_ON(ret);
653}
654EXPORT_SYMBOL_GPL(devm_of_platform_depopulate);
655
656#ifdef CONFIG_OF_DYNAMIC
657static int of_platform_notify(struct notifier_block *nb,
658 unsigned long action, void *arg)
659{
660 struct of_reconfig_data *rd = arg;
661 struct platform_device *pdev_parent, *pdev;
662 bool children_left;
663
664 switch (of_reconfig_get_state_change(action, rd)) {
665 case OF_RECONFIG_CHANGE_ADD:
666 /* verify that the parent is a bus */
667 if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS))
668 return NOTIFY_OK; /* not for us */
669
670 /* already populated? (driver using of_populate manually) */
671 if (of_node_check_flag(rd->dn, OF_POPULATED))
672 return NOTIFY_OK;
673
674 /* pdev_parent may be NULL when no bus platform device */
675 pdev_parent = of_find_device_by_node(rd->dn->parent);
676 pdev = of_platform_device_create(rd->dn, NULL,
677 pdev_parent ? &pdev_parent->dev : NULL);
678 of_dev_put(pdev_parent);
679
680 if (pdev == NULL) {
681 pr_err("%s: failed to create for '%pOF'\n",
682 __func__, rd->dn);
683 /* of_platform_device_create tosses the error code */
684 return notifier_from_errno(-EINVAL);
685 }
686 break;
687
688 case OF_RECONFIG_CHANGE_REMOVE:
689
690 /* already depopulated? */
691 if (!of_node_check_flag(rd->dn, OF_POPULATED))
692 return NOTIFY_OK;
693
694 /* find our device by node */
695 pdev = of_find_device_by_node(rd->dn);
696 if (pdev == NULL)
697 return NOTIFY_OK; /* no? not meant for us */
698
699 /* unregister takes one ref away */
700 of_platform_device_destroy(&pdev->dev, &children_left);
701
702 /* and put the reference of the find */
703 of_dev_put(pdev);
704 break;
705 }
706
707 return NOTIFY_OK;
708}
709
710static struct notifier_block platform_of_notifier = {
711 .notifier_call = of_platform_notify,
712};
713
714void of_platform_register_reconfig_notifier(void)
715{
716 WARN_ON(of_reconfig_notifier_register(&platform_of_notifier));
717}
718#endif /* CONFIG_OF_DYNAMIC */
719
720#endif /* CONFIG_OF_ADDRESS */
1/*
2 * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
3 * <benh@kernel.crashing.org>
4 * and Arnd Bergmann, IBM Corp.
5 * Merged from powerpc/kernel/of_platform.c and
6 * sparc{,64}/kernel/of_device.c by Stephen Rothwell
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 *
13 */
14#include <linux/errno.h>
15#include <linux/module.h>
16#include <linux/amba/bus.h>
17#include <linux/device.h>
18#include <linux/dma-mapping.h>
19#include <linux/slab.h>
20#include <linux/of_address.h>
21#include <linux/of_device.h>
22#include <linux/of_irq.h>
23#include <linux/of_platform.h>
24#include <linux/platform_device.h>
25
26const struct of_device_id of_default_bus_match_table[] = {
27 { .compatible = "simple-bus", },
28#ifdef CONFIG_ARM_AMBA
29 { .compatible = "arm,amba-bus", },
30#endif /* CONFIG_ARM_AMBA */
31 {} /* Empty terminated list */
32};
33
34static int of_dev_node_match(struct device *dev, void *data)
35{
36 return dev->of_node == data;
37}
38
39/**
40 * of_find_device_by_node - Find the platform_device associated with a node
41 * @np: Pointer to device tree node
42 *
43 * Returns platform_device pointer, or NULL if not found
44 */
45struct platform_device *of_find_device_by_node(struct device_node *np)
46{
47 struct device *dev;
48
49 dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match);
50 return dev ? to_platform_device(dev) : NULL;
51}
52EXPORT_SYMBOL(of_find_device_by_node);
53
54#if defined(CONFIG_PPC_DCR)
55#include <asm/dcr.h>
56#endif
57
58#ifdef CONFIG_OF_ADDRESS
59/*
60 * The following routines scan a subtree and registers a device for
61 * each applicable node.
62 *
63 * Note: sparc doesn't use these routines because it has a different
64 * mechanism for creating devices from device tree nodes.
65 */
66
67/**
68 * of_device_make_bus_id - Use the device node data to assign a unique name
69 * @dev: pointer to device structure that is linked to a device tree node
70 *
71 * This routine will first try using either the dcr-reg or the reg property
72 * value to derive a unique name. As a last resort it will use the node
73 * name followed by a unique number.
74 */
75void of_device_make_bus_id(struct device *dev)
76{
77 static atomic_t bus_no_reg_magic;
78 struct device_node *node = dev->of_node;
79 const __be32 *reg;
80 u64 addr;
81 const __be32 *addrp;
82 int magic;
83
84#ifdef CONFIG_PPC_DCR
85 /*
86 * If it's a DCR based device, use 'd' for native DCRs
87 * and 'D' for MMIO DCRs.
88 */
89 reg = of_get_property(node, "dcr-reg", NULL);
90 if (reg) {
91#ifdef CONFIG_PPC_DCR_NATIVE
92 dev_set_name(dev, "d%x.%s", *reg, node->name);
93#else /* CONFIG_PPC_DCR_NATIVE */
94 u64 addr = of_translate_dcr_address(node, *reg, NULL);
95 if (addr != OF_BAD_ADDR) {
96 dev_set_name(dev, "D%llx.%s",
97 (unsigned long long)addr, node->name);
98 return;
99 }
100#endif /* !CONFIG_PPC_DCR_NATIVE */
101 }
102#endif /* CONFIG_PPC_DCR */
103
104 /*
105 * For MMIO, get the physical address
106 */
107 reg = of_get_property(node, "reg", NULL);
108 if (reg) {
109 if (of_can_translate_address(node)) {
110 addr = of_translate_address(node, reg);
111 } else {
112 addrp = of_get_address(node, 0, NULL, NULL);
113 if (addrp)
114 addr = of_read_number(addrp, 1);
115 else
116 addr = OF_BAD_ADDR;
117 }
118 if (addr != OF_BAD_ADDR) {
119 dev_set_name(dev, "%llx.%s",
120 (unsigned long long)addr, node->name);
121 return;
122 }
123 }
124
125 /*
126 * No BusID, use the node name and add a globally incremented
127 * counter (and pray...)
128 */
129 magic = atomic_add_return(1, &bus_no_reg_magic);
130 dev_set_name(dev, "%s.%d", node->name, magic - 1);
131}
132
133/**
134 * of_device_alloc - Allocate and initialize an of_device
135 * @np: device node to assign to device
136 * @bus_id: Name to assign to the device. May be null to use default name.
137 * @parent: Parent device.
138 */
139struct platform_device *of_device_alloc(struct device_node *np,
140 const char *bus_id,
141 struct device *parent)
142{
143 struct platform_device *dev;
144 int rc, i, num_reg = 0, num_irq;
145 struct resource *res, temp_res;
146
147 dev = platform_device_alloc("", -1);
148 if (!dev)
149 return NULL;
150
151 /* count the io and irq resources */
152 if (of_can_translate_address(np))
153 while (of_address_to_resource(np, num_reg, &temp_res) == 0)
154 num_reg++;
155 num_irq = of_irq_count(np);
156
157 /* Populate the resource table */
158 if (num_irq || num_reg) {
159 res = kzalloc(sizeof(*res) * (num_irq + num_reg), GFP_KERNEL);
160 if (!res) {
161 platform_device_put(dev);
162 return NULL;
163 }
164
165 dev->num_resources = num_reg + num_irq;
166 dev->resource = res;
167 for (i = 0; i < num_reg; i++, res++) {
168 rc = of_address_to_resource(np, i, res);
169 WARN_ON(rc);
170 }
171 if (of_irq_to_resource_table(np, res, num_irq) != num_irq)
172 pr_debug("not all legacy IRQ resources mapped for %s\n",
173 np->name);
174 }
175
176 dev->dev.of_node = of_node_get(np);
177#if defined(CONFIG_MICROBLAZE)
178 dev->dev.dma_mask = &dev->archdata.dma_mask;
179#endif
180 dev->dev.parent = parent;
181
182 if (bus_id)
183 dev_set_name(&dev->dev, "%s", bus_id);
184 else
185 of_device_make_bus_id(&dev->dev);
186
187 return dev;
188}
189EXPORT_SYMBOL(of_device_alloc);
190
191/**
192 * of_platform_device_create_pdata - Alloc, initialize and register an of_device
193 * @np: pointer to node to create device for
194 * @bus_id: name to assign device
195 * @platform_data: pointer to populate platform_data pointer with
196 * @parent: Linux device model parent device.
197 *
198 * Returns pointer to created platform device, or NULL if a device was not
199 * registered. Unavailable devices will not get registered.
200 */
201static struct platform_device *of_platform_device_create_pdata(
202 struct device_node *np,
203 const char *bus_id,
204 void *platform_data,
205 struct device *parent)
206{
207 struct platform_device *dev;
208
209 if (!of_device_is_available(np))
210 return NULL;
211
212 dev = of_device_alloc(np, bus_id, parent);
213 if (!dev)
214 return NULL;
215
216#if defined(CONFIG_MICROBLAZE)
217 dev->archdata.dma_mask = 0xffffffffUL;
218#endif
219 dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
220 if (!dev->dev.dma_mask)
221 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
222 dev->dev.bus = &platform_bus_type;
223 dev->dev.platform_data = platform_data;
224
225 /* We do not fill the DMA ops for platform devices by default.
226 * This is currently the responsibility of the platform code
227 * to do such, possibly using a device notifier
228 */
229
230 if (of_device_add(dev) != 0) {
231 platform_device_put(dev);
232 return NULL;
233 }
234
235 return dev;
236}
237
238/**
239 * of_platform_device_create - Alloc, initialize and register an of_device
240 * @np: pointer to node to create device for
241 * @bus_id: name to assign device
242 * @parent: Linux device model parent device.
243 *
244 * Returns pointer to created platform device, or NULL if a device was not
245 * registered. Unavailable devices will not get registered.
246 */
247struct platform_device *of_platform_device_create(struct device_node *np,
248 const char *bus_id,
249 struct device *parent)
250{
251 return of_platform_device_create_pdata(np, bus_id, NULL, parent);
252}
253EXPORT_SYMBOL(of_platform_device_create);
254
255#ifdef CONFIG_ARM_AMBA
256static struct amba_device *of_amba_device_create(struct device_node *node,
257 const char *bus_id,
258 void *platform_data,
259 struct device *parent)
260{
261 struct amba_device *dev;
262 const void *prop;
263 int i, ret;
264
265 pr_debug("Creating amba device %s\n", node->full_name);
266
267 if (!of_device_is_available(node))
268 return NULL;
269
270 dev = amba_device_alloc(NULL, 0, 0);
271 if (!dev) {
272 pr_err("%s(): amba_device_alloc() failed for %s\n",
273 __func__, node->full_name);
274 return NULL;
275 }
276
277 /* setup generic device info */
278 dev->dev.coherent_dma_mask = ~0;
279 dev->dev.of_node = of_node_get(node);
280 dev->dev.parent = parent;
281 dev->dev.platform_data = platform_data;
282 if (bus_id)
283 dev_set_name(&dev->dev, "%s", bus_id);
284 else
285 of_device_make_bus_id(&dev->dev);
286
287 /* Allow the HW Peripheral ID to be overridden */
288 prop = of_get_property(node, "arm,primecell-periphid", NULL);
289 if (prop)
290 dev->periphid = of_read_ulong(prop, 1);
291
292 /* Decode the IRQs and address ranges */
293 for (i = 0; i < AMBA_NR_IRQS; i++)
294 dev->irq[i] = irq_of_parse_and_map(node, i);
295
296 ret = of_address_to_resource(node, 0, &dev->res);
297 if (ret) {
298 pr_err("%s(): of_address_to_resource() failed (%d) for %s\n",
299 __func__, ret, node->full_name);
300 goto err_free;
301 }
302
303 ret = amba_device_add(dev, &iomem_resource);
304 if (ret) {
305 pr_err("%s(): amba_device_add() failed (%d) for %s\n",
306 __func__, ret, node->full_name);
307 goto err_free;
308 }
309
310 return dev;
311
312err_free:
313 amba_device_put(dev);
314 return NULL;
315}
316#else /* CONFIG_ARM_AMBA */
317static struct amba_device *of_amba_device_create(struct device_node *node,
318 const char *bus_id,
319 void *platform_data,
320 struct device *parent)
321{
322 return NULL;
323}
324#endif /* CONFIG_ARM_AMBA */
325
326/**
327 * of_devname_lookup() - Given a device node, lookup the preferred Linux name
328 */
329static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup,
330 struct device_node *np)
331{
332 struct resource res;
333
334 if (!lookup)
335 return NULL;
336
337 for(; lookup->compatible != NULL; lookup++) {
338 if (!of_device_is_compatible(np, lookup->compatible))
339 continue;
340 if (!of_address_to_resource(np, 0, &res))
341 if (res.start != lookup->phys_addr)
342 continue;
343 pr_debug("%s: devname=%s\n", np->full_name, lookup->name);
344 return lookup;
345 }
346
347 return NULL;
348}
349
350/**
351 * of_platform_bus_create() - Create a device for a node and its children.
352 * @bus: device node of the bus to instantiate
353 * @matches: match table for bus nodes
354 * @lookup: auxdata table for matching id and platform_data with device nodes
355 * @parent: parent for new device, or NULL for top level.
356 * @strict: require compatible property
357 *
358 * Creates a platform_device for the provided device_node, and optionally
359 * recursively create devices for all the child nodes.
360 */
361static int of_platform_bus_create(struct device_node *bus,
362 const struct of_device_id *matches,
363 const struct of_dev_auxdata *lookup,
364 struct device *parent, bool strict)
365{
366 const struct of_dev_auxdata *auxdata;
367 struct device_node *child;
368 struct platform_device *dev;
369 const char *bus_id = NULL;
370 void *platform_data = NULL;
371 int rc = 0;
372
373 /* Make sure it has a compatible property */
374 if (strict && (!of_get_property(bus, "compatible", NULL))) {
375 pr_debug("%s() - skipping %s, no compatible prop\n",
376 __func__, bus->full_name);
377 return 0;
378 }
379
380 auxdata = of_dev_lookup(lookup, bus);
381 if (auxdata) {
382 bus_id = auxdata->name;
383 platform_data = auxdata->platform_data;
384 }
385
386 if (of_device_is_compatible(bus, "arm,primecell")) {
387 /*
388 * Don't return an error here to keep compatibility with older
389 * device tree files.
390 */
391 of_amba_device_create(bus, bus_id, platform_data, parent);
392 return 0;
393 }
394
395 dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent);
396 if (!dev || !of_match_node(matches, bus))
397 return 0;
398
399 for_each_child_of_node(bus, child) {
400 pr_debug(" create child: %s\n", child->full_name);
401 rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);
402 if (rc) {
403 of_node_put(child);
404 break;
405 }
406 }
407 return rc;
408}
409
410/**
411 * of_platform_bus_probe() - Probe the device-tree for platform buses
412 * @root: parent of the first level to probe or NULL for the root of the tree
413 * @matches: match table for bus nodes
414 * @parent: parent to hook devices from, NULL for toplevel
415 *
416 * Note that children of the provided root are not instantiated as devices
417 * unless the specified root itself matches the bus list and is not NULL.
418 */
419int of_platform_bus_probe(struct device_node *root,
420 const struct of_device_id *matches,
421 struct device *parent)
422{
423 struct device_node *child;
424 int rc = 0;
425
426 root = root ? of_node_get(root) : of_find_node_by_path("/");
427 if (!root)
428 return -EINVAL;
429
430 pr_debug("of_platform_bus_probe()\n");
431 pr_debug(" starting at: %s\n", root->full_name);
432
433 /* Do a self check of bus type, if there's a match, create children */
434 if (of_match_node(matches, root)) {
435 rc = of_platform_bus_create(root, matches, NULL, parent, false);
436 } else for_each_child_of_node(root, child) {
437 if (!of_match_node(matches, child))
438 continue;
439 rc = of_platform_bus_create(child, matches, NULL, parent, false);
440 if (rc)
441 break;
442 }
443
444 of_node_put(root);
445 return rc;
446}
447EXPORT_SYMBOL(of_platform_bus_probe);
448
449/**
450 * of_platform_populate() - Populate platform_devices from device tree data
451 * @root: parent of the first level to probe or NULL for the root of the tree
452 * @matches: match table, NULL to use the default
453 * @lookup: auxdata table for matching id and platform_data with device nodes
454 * @parent: parent to hook devices from, NULL for toplevel
455 *
456 * Similar to of_platform_bus_probe(), this function walks the device tree
457 * and creates devices from nodes. It differs in that it follows the modern
458 * convention of requiring all device nodes to have a 'compatible' property,
459 * and it is suitable for creating devices which are children of the root
460 * node (of_platform_bus_probe will only create children of the root which
461 * are selected by the @matches argument).
462 *
463 * New board support should be using this function instead of
464 * of_platform_bus_probe().
465 *
466 * Returns 0 on success, < 0 on failure.
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 for_each_child_of_node(root, child) {
481 rc = of_platform_bus_create(child, matches, lookup, parent, true);
482 if (rc)
483 break;
484 }
485
486 of_node_put(root);
487 return rc;
488}
489EXPORT_SYMBOL_GPL(of_platform_populate);
490#endif /* CONFIG_OF_ADDRESS */