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
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.
14 #include <linux/errno.h>
15 #include <linux/module.h>
16 #include <linux/device.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/of_device.h>
19 #include <linux/of_platform.h>
21 extern struct device_attribute of_platform_device_attrs
[];
23 static int of_platform_bus_match(struct device
*dev
, struct device_driver
*drv
)
25 const struct of_device_id
*matches
= drv
->of_match_table
;
30 return of_match_device(matches
, dev
) != NULL
;
33 static int of_platform_device_probe(struct device
*dev
)
36 struct of_platform_driver
*drv
;
37 struct of_device
*of_dev
;
38 const struct of_device_id
*match
;
40 drv
= to_of_platform_driver(dev
->driver
);
41 of_dev
= to_of_device(dev
);
48 match
= of_match_device(drv
->driver
.of_match_table
, dev
);
50 error
= drv
->probe(of_dev
, match
);
57 static int of_platform_device_remove(struct device
*dev
)
59 struct of_device
*of_dev
= to_of_device(dev
);
60 struct of_platform_driver
*drv
= to_of_platform_driver(dev
->driver
);
62 if (dev
->driver
&& drv
->remove
)
67 static void of_platform_device_shutdown(struct device
*dev
)
69 struct of_device
*of_dev
= to_of_device(dev
);
70 struct of_platform_driver
*drv
= to_of_platform_driver(dev
->driver
);
72 if (dev
->driver
&& drv
->shutdown
)
73 drv
->shutdown(of_dev
);
76 #ifdef CONFIG_PM_SLEEP
78 static int of_platform_legacy_suspend(struct device
*dev
, pm_message_t mesg
)
80 struct of_device
*of_dev
= to_of_device(dev
);
81 struct of_platform_driver
*drv
= to_of_platform_driver(dev
->driver
);
84 if (dev
->driver
&& drv
->suspend
)
85 ret
= drv
->suspend(of_dev
, mesg
);
89 static int of_platform_legacy_resume(struct device
*dev
)
91 struct of_device
*of_dev
= to_of_device(dev
);
92 struct of_platform_driver
*drv
= to_of_platform_driver(dev
->driver
);
95 if (dev
->driver
&& drv
->resume
)
96 ret
= drv
->resume(of_dev
);
100 static int of_platform_pm_prepare(struct device
*dev
)
102 struct device_driver
*drv
= dev
->driver
;
105 if (drv
&& drv
->pm
&& drv
->pm
->prepare
)
106 ret
= drv
->pm
->prepare(dev
);
111 static void of_platform_pm_complete(struct device
*dev
)
113 struct device_driver
*drv
= dev
->driver
;
115 if (drv
&& drv
->pm
&& drv
->pm
->complete
)
116 drv
->pm
->complete(dev
);
119 #ifdef CONFIG_SUSPEND
121 static int of_platform_pm_suspend(struct device
*dev
)
123 struct device_driver
*drv
= dev
->driver
;
130 if (drv
->pm
->suspend
)
131 ret
= drv
->pm
->suspend(dev
);
133 ret
= of_platform_legacy_suspend(dev
, PMSG_SUSPEND
);
139 static int of_platform_pm_suspend_noirq(struct device
*dev
)
141 struct device_driver
*drv
= dev
->driver
;
148 if (drv
->pm
->suspend_noirq
)
149 ret
= drv
->pm
->suspend_noirq(dev
);
155 static int of_platform_pm_resume(struct device
*dev
)
157 struct device_driver
*drv
= dev
->driver
;
165 ret
= drv
->pm
->resume(dev
);
167 ret
= of_platform_legacy_resume(dev
);
173 static int of_platform_pm_resume_noirq(struct device
*dev
)
175 struct device_driver
*drv
= dev
->driver
;
182 if (drv
->pm
->resume_noirq
)
183 ret
= drv
->pm
->resume_noirq(dev
);
189 #else /* !CONFIG_SUSPEND */
191 #define of_platform_pm_suspend NULL
192 #define of_platform_pm_resume NULL
193 #define of_platform_pm_suspend_noirq NULL
194 #define of_platform_pm_resume_noirq NULL
196 #endif /* !CONFIG_SUSPEND */
198 #ifdef CONFIG_HIBERNATION
200 static int of_platform_pm_freeze(struct device
*dev
)
202 struct device_driver
*drv
= dev
->driver
;
210 ret
= drv
->pm
->freeze(dev
);
212 ret
= of_platform_legacy_suspend(dev
, PMSG_FREEZE
);
218 static int of_platform_pm_freeze_noirq(struct device
*dev
)
220 struct device_driver
*drv
= dev
->driver
;
227 if (drv
->pm
->freeze_noirq
)
228 ret
= drv
->pm
->freeze_noirq(dev
);
234 static int of_platform_pm_thaw(struct device
*dev
)
236 struct device_driver
*drv
= dev
->driver
;
244 ret
= drv
->pm
->thaw(dev
);
246 ret
= of_platform_legacy_resume(dev
);
252 static int of_platform_pm_thaw_noirq(struct device
*dev
)
254 struct device_driver
*drv
= dev
->driver
;
261 if (drv
->pm
->thaw_noirq
)
262 ret
= drv
->pm
->thaw_noirq(dev
);
268 static int of_platform_pm_poweroff(struct device
*dev
)
270 struct device_driver
*drv
= dev
->driver
;
277 if (drv
->pm
->poweroff
)
278 ret
= drv
->pm
->poweroff(dev
);
280 ret
= of_platform_legacy_suspend(dev
, PMSG_HIBERNATE
);
286 static int of_platform_pm_poweroff_noirq(struct device
*dev
)
288 struct device_driver
*drv
= dev
->driver
;
295 if (drv
->pm
->poweroff_noirq
)
296 ret
= drv
->pm
->poweroff_noirq(dev
);
302 static int of_platform_pm_restore(struct device
*dev
)
304 struct device_driver
*drv
= dev
->driver
;
311 if (drv
->pm
->restore
)
312 ret
= drv
->pm
->restore(dev
);
314 ret
= of_platform_legacy_resume(dev
);
320 static int of_platform_pm_restore_noirq(struct device
*dev
)
322 struct device_driver
*drv
= dev
->driver
;
329 if (drv
->pm
->restore_noirq
)
330 ret
= drv
->pm
->restore_noirq(dev
);
336 #else /* !CONFIG_HIBERNATION */
338 #define of_platform_pm_freeze NULL
339 #define of_platform_pm_thaw NULL
340 #define of_platform_pm_poweroff NULL
341 #define of_platform_pm_restore NULL
342 #define of_platform_pm_freeze_noirq NULL
343 #define of_platform_pm_thaw_noirq NULL
344 #define of_platform_pm_poweroff_noirq NULL
345 #define of_platform_pm_restore_noirq NULL
347 #endif /* !CONFIG_HIBERNATION */
349 static struct dev_pm_ops of_platform_dev_pm_ops
= {
350 .prepare
= of_platform_pm_prepare
,
351 .complete
= of_platform_pm_complete
,
352 .suspend
= of_platform_pm_suspend
,
353 .resume
= of_platform_pm_resume
,
354 .freeze
= of_platform_pm_freeze
,
355 .thaw
= of_platform_pm_thaw
,
356 .poweroff
= of_platform_pm_poweroff
,
357 .restore
= of_platform_pm_restore
,
358 .suspend_noirq
= of_platform_pm_suspend_noirq
,
359 .resume_noirq
= of_platform_pm_resume_noirq
,
360 .freeze_noirq
= of_platform_pm_freeze_noirq
,
361 .thaw_noirq
= of_platform_pm_thaw_noirq
,
362 .poweroff_noirq
= of_platform_pm_poweroff_noirq
,
363 .restore_noirq
= of_platform_pm_restore_noirq
,
366 #define OF_PLATFORM_PM_OPS_PTR (&of_platform_dev_pm_ops)
368 #else /* !CONFIG_PM_SLEEP */
370 #define OF_PLATFORM_PM_OPS_PTR NULL
372 #endif /* !CONFIG_PM_SLEEP */
374 int of_bus_type_init(struct bus_type
*bus
, const char *name
)
377 bus
->match
= of_platform_bus_match
;
378 bus
->probe
= of_platform_device_probe
;
379 bus
->remove
= of_platform_device_remove
;
380 bus
->shutdown
= of_platform_device_shutdown
;
381 bus
->dev_attrs
= of_platform_device_attrs
;
382 bus
->pm
= OF_PLATFORM_PM_OPS_PTR
;
383 return bus_register(bus
);
386 int of_register_driver(struct of_platform_driver
*drv
, struct bus_type
*bus
)
388 drv
->driver
.bus
= bus
;
390 /* register with core */
391 return driver_register(&drv
->driver
);
393 EXPORT_SYMBOL(of_register_driver
);
395 void of_unregister_driver(struct of_platform_driver
*drv
)
397 driver_unregister(&drv
->driver
);
399 EXPORT_SYMBOL(of_unregister_driver
);
401 #if !defined(CONFIG_SPARC)
403 * The following routines scan a subtree and registers a device for
404 * each applicable node.
406 * Note: sparc doesn't use these routines because it has a different
407 * mechanism for creating devices from device tree nodes.
411 * of_device_make_bus_id - Use the device node data to assign a unique name
412 * @dev: pointer to device structure that is linked to a device tree node
414 * This routine will first try using either the dcr-reg or the reg property
415 * value to derive a unique name. As a last resort it will use the node
416 * name followed by a unique number.
418 static void of_device_make_bus_id(struct device
*dev
)
420 static atomic_t bus_no_reg_magic
;
421 struct device_node
*node
= dev
->of_node
;
426 #ifdef CONFIG_PPC_DCR
428 * If it's a DCR based device, use 'd' for native DCRs
429 * and 'D' for MMIO DCRs.
431 reg
= of_get_property(node
, "dcr-reg", NULL
);
433 #ifdef CONFIG_PPC_DCR_NATIVE
434 dev_set_name(dev
, "d%x.%s", *reg
, node
->name
);
435 #else /* CONFIG_PPC_DCR_NATIVE */
436 u64 addr
= of_translate_dcr_address(node
, *reg
, NULL
);
437 if (addr
!= OF_BAD_ADDR
) {
438 dev_set_name(dev
, "D%llx.%s",
439 (unsigned long long)addr
, node
->name
);
442 #endif /* !CONFIG_PPC_DCR_NATIVE */
444 #endif /* CONFIG_PPC_DCR */
447 * For MMIO, get the physical address
449 reg
= of_get_property(node
, "reg", NULL
);
451 addr
= of_translate_address(node
, reg
);
452 if (addr
!= OF_BAD_ADDR
) {
453 dev_set_name(dev
, "%llx.%s",
454 (unsigned long long)addr
, node
->name
);
460 * No BusID, use the node name and add a globally incremented
461 * counter (and pray...)
463 magic
= atomic_add_return(1, &bus_no_reg_magic
);
464 dev_set_name(dev
, "%s.%d", node
->name
, magic
- 1);
468 * of_device_alloc - Allocate and initialize an of_device
469 * @np: device node to assign to device
470 * @bus_id: Name to assign to the device. May be null to use default name.
471 * @parent: Parent device.
473 struct of_device
*of_device_alloc(struct device_node
*np
,
475 struct device
*parent
)
477 struct of_device
*dev
;
478 int rc
, i
, num_reg
= 0, num_irq
= 0;
479 struct resource
*res
, temp_res
;
481 /* First count how many resources are needed */
482 while (of_address_to_resource(np
, num_reg
, &temp_res
) == 0)
484 while (of_irq_to_resource(np
, num_irq
, &temp_res
) != NO_IRQ
)
487 /* Allocate memory for both the struct device and the resource table */
488 dev
= kzalloc(sizeof(*dev
) + (sizeof(*res
) * (num_reg
+ num_irq
)),
492 res
= (struct resource
*) &dev
[1];
494 /* Populate the resource table */
495 if (num_irq
|| num_reg
) {
496 dev
->num_resources
= num_reg
+ num_irq
;
498 for (i
= 0; i
< num_reg
; i
++, res
++) {
499 rc
= of_address_to_resource(np
, i
, res
);
502 for (i
= 0; i
< num_irq
; i
++, res
++) {
503 rc
= of_irq_to_resource(np
, i
, res
);
504 WARN_ON(rc
== NO_IRQ
);
508 dev
->dev
.of_node
= of_node_get(np
);
509 dev
->dev
.dma_mask
= &dev
->archdata
.dma_mask
;
510 dev
->dev
.parent
= parent
;
511 dev
->dev
.release
= of_release_dev
;
514 dev_set_name(&dev
->dev
, "%s", bus_id
);
516 of_device_make_bus_id(&dev
->dev
);
520 EXPORT_SYMBOL(of_device_alloc
);
523 * of_platform_device_create - Alloc, initialize and register an of_device
524 * @np: pointer to node to create device for
525 * @bus_id: name to assign device
526 * @parent: Linux device model parent device.
528 struct of_device
*of_platform_device_create(struct device_node
*np
,
530 struct device
*parent
)
532 struct of_device
*dev
;
534 dev
= of_device_alloc(np
, bus_id
, parent
);
538 dev
->archdata
.dma_mask
= 0xffffffffUL
;
539 dev
->dev
.coherent_dma_mask
= DMA_BIT_MASK(32);
540 dev
->dev
.bus
= &of_platform_bus_type
;
542 /* We do not fill the DMA ops for platform devices by default.
543 * This is currently the responsibility of the platform code
544 * to do such, possibly using a device notifier
547 if (of_device_register(dev
) != 0) {
554 EXPORT_SYMBOL(of_platform_device_create
);
557 * of_platform_bus_create - Create an OF device for a bus node and all its
558 * children. Optionally recursively instantiate matching busses.
559 * @bus: device node of the bus to instantiate
560 * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to
561 * disallow recursive creation of child busses
563 static int of_platform_bus_create(const struct device_node
*bus
,
564 const struct of_device_id
*matches
,
565 struct device
*parent
)
567 struct device_node
*child
;
568 struct of_device
*dev
;
571 for_each_child_of_node(bus
, child
) {
572 pr_debug(" create child: %s\n", child
->full_name
);
573 dev
= of_platform_device_create(child
, NULL
, parent
);
576 else if (!of_match_node(matches
, child
))
579 pr_debug(" and sub busses\n");
580 rc
= of_platform_bus_create(child
, matches
, &dev
->dev
);
591 * of_platform_bus_probe - Probe the device-tree for platform busses
592 * @root: parent of the first level to probe or NULL for the root of the tree
593 * @matches: match table, NULL to use the default
594 * @parent: parent to hook devices from, NULL for toplevel
596 * Note that children of the provided root are not instantiated as devices
597 * unless the specified root itself matches the bus list and is not NULL.
599 int of_platform_bus_probe(struct device_node
*root
,
600 const struct of_device_id
*matches
,
601 struct device
*parent
)
603 struct device_node
*child
;
604 struct of_device
*dev
;
608 matches
= of_default_bus_ids
;
609 if (matches
== OF_NO_DEEP_PROBE
)
612 root
= of_find_node_by_path("/");
616 pr_debug("of_platform_bus_probe()\n");
617 pr_debug(" starting at: %s\n", root
->full_name
);
619 /* Do a self check of bus type, if there's a match, create
622 if (of_match_node(matches
, root
)) {
623 pr_debug(" root match, create all sub devices\n");
624 dev
= of_platform_device_create(root
, NULL
, parent
);
629 pr_debug(" create all sub busses\n");
630 rc
= of_platform_bus_create(root
, matches
, &dev
->dev
);
633 for_each_child_of_node(root
, child
) {
634 if (!of_match_node(matches
, child
))
637 pr_debug(" match: %s\n", child
->full_name
);
638 dev
= of_platform_device_create(child
, NULL
, parent
);
642 rc
= of_platform_bus_create(child
, matches
, &dev
->dev
);
652 EXPORT_SYMBOL(of_platform_bus_probe
);
653 #endif /* !CONFIG_SPARC */