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/slab.h>
19 #include <linux/of_device.h>
20 #include <linux/of_platform.h>
22 extern struct device_attribute of_platform_device_attrs
[];
24 static int of_platform_bus_match(struct device
*dev
, struct device_driver
*drv
)
26 const struct of_device_id
*matches
= drv
->of_match_table
;
31 return of_match_device(matches
, dev
) != NULL
;
34 static int of_platform_device_probe(struct device
*dev
)
37 struct of_platform_driver
*drv
;
38 struct of_device
*of_dev
;
39 const struct of_device_id
*match
;
41 drv
= to_of_platform_driver(dev
->driver
);
42 of_dev
= to_of_device(dev
);
49 match
= of_match_device(drv
->driver
.of_match_table
, dev
);
51 error
= drv
->probe(of_dev
, match
);
58 static int of_platform_device_remove(struct device
*dev
)
60 struct of_device
*of_dev
= to_of_device(dev
);
61 struct of_platform_driver
*drv
= to_of_platform_driver(dev
->driver
);
63 if (dev
->driver
&& drv
->remove
)
68 static void of_platform_device_shutdown(struct device
*dev
)
70 struct of_device
*of_dev
= to_of_device(dev
);
71 struct of_platform_driver
*drv
= to_of_platform_driver(dev
->driver
);
73 if (dev
->driver
&& drv
->shutdown
)
74 drv
->shutdown(of_dev
);
77 #ifdef CONFIG_PM_SLEEP
79 static int of_platform_legacy_suspend(struct device
*dev
, pm_message_t mesg
)
81 struct of_device
*of_dev
= to_of_device(dev
);
82 struct of_platform_driver
*drv
= to_of_platform_driver(dev
->driver
);
85 if (dev
->driver
&& drv
->suspend
)
86 ret
= drv
->suspend(of_dev
, mesg
);
90 static int of_platform_legacy_resume(struct device
*dev
)
92 struct of_device
*of_dev
= to_of_device(dev
);
93 struct of_platform_driver
*drv
= to_of_platform_driver(dev
->driver
);
96 if (dev
->driver
&& drv
->resume
)
97 ret
= drv
->resume(of_dev
);
101 static int of_platform_pm_prepare(struct device
*dev
)
103 struct device_driver
*drv
= dev
->driver
;
106 if (drv
&& drv
->pm
&& drv
->pm
->prepare
)
107 ret
= drv
->pm
->prepare(dev
);
112 static void of_platform_pm_complete(struct device
*dev
)
114 struct device_driver
*drv
= dev
->driver
;
116 if (drv
&& drv
->pm
&& drv
->pm
->complete
)
117 drv
->pm
->complete(dev
);
120 #ifdef CONFIG_SUSPEND
122 static int of_platform_pm_suspend(struct device
*dev
)
124 struct device_driver
*drv
= dev
->driver
;
131 if (drv
->pm
->suspend
)
132 ret
= drv
->pm
->suspend(dev
);
134 ret
= of_platform_legacy_suspend(dev
, PMSG_SUSPEND
);
140 static int of_platform_pm_suspend_noirq(struct device
*dev
)
142 struct device_driver
*drv
= dev
->driver
;
149 if (drv
->pm
->suspend_noirq
)
150 ret
= drv
->pm
->suspend_noirq(dev
);
156 static int of_platform_pm_resume(struct device
*dev
)
158 struct device_driver
*drv
= dev
->driver
;
166 ret
= drv
->pm
->resume(dev
);
168 ret
= of_platform_legacy_resume(dev
);
174 static int of_platform_pm_resume_noirq(struct device
*dev
)
176 struct device_driver
*drv
= dev
->driver
;
183 if (drv
->pm
->resume_noirq
)
184 ret
= drv
->pm
->resume_noirq(dev
);
190 #else /* !CONFIG_SUSPEND */
192 #define of_platform_pm_suspend NULL
193 #define of_platform_pm_resume NULL
194 #define of_platform_pm_suspend_noirq NULL
195 #define of_platform_pm_resume_noirq NULL
197 #endif /* !CONFIG_SUSPEND */
199 #ifdef CONFIG_HIBERNATION
201 static int of_platform_pm_freeze(struct device
*dev
)
203 struct device_driver
*drv
= dev
->driver
;
211 ret
= drv
->pm
->freeze(dev
);
213 ret
= of_platform_legacy_suspend(dev
, PMSG_FREEZE
);
219 static int of_platform_pm_freeze_noirq(struct device
*dev
)
221 struct device_driver
*drv
= dev
->driver
;
228 if (drv
->pm
->freeze_noirq
)
229 ret
= drv
->pm
->freeze_noirq(dev
);
235 static int of_platform_pm_thaw(struct device
*dev
)
237 struct device_driver
*drv
= dev
->driver
;
245 ret
= drv
->pm
->thaw(dev
);
247 ret
= of_platform_legacy_resume(dev
);
253 static int of_platform_pm_thaw_noirq(struct device
*dev
)
255 struct device_driver
*drv
= dev
->driver
;
262 if (drv
->pm
->thaw_noirq
)
263 ret
= drv
->pm
->thaw_noirq(dev
);
269 static int of_platform_pm_poweroff(struct device
*dev
)
271 struct device_driver
*drv
= dev
->driver
;
278 if (drv
->pm
->poweroff
)
279 ret
= drv
->pm
->poweroff(dev
);
281 ret
= of_platform_legacy_suspend(dev
, PMSG_HIBERNATE
);
287 static int of_platform_pm_poweroff_noirq(struct device
*dev
)
289 struct device_driver
*drv
= dev
->driver
;
296 if (drv
->pm
->poweroff_noirq
)
297 ret
= drv
->pm
->poweroff_noirq(dev
);
303 static int of_platform_pm_restore(struct device
*dev
)
305 struct device_driver
*drv
= dev
->driver
;
312 if (drv
->pm
->restore
)
313 ret
= drv
->pm
->restore(dev
);
315 ret
= of_platform_legacy_resume(dev
);
321 static int of_platform_pm_restore_noirq(struct device
*dev
)
323 struct device_driver
*drv
= dev
->driver
;
330 if (drv
->pm
->restore_noirq
)
331 ret
= drv
->pm
->restore_noirq(dev
);
337 #else /* !CONFIG_HIBERNATION */
339 #define of_platform_pm_freeze NULL
340 #define of_platform_pm_thaw NULL
341 #define of_platform_pm_poweroff NULL
342 #define of_platform_pm_restore NULL
343 #define of_platform_pm_freeze_noirq NULL
344 #define of_platform_pm_thaw_noirq NULL
345 #define of_platform_pm_poweroff_noirq NULL
346 #define of_platform_pm_restore_noirq NULL
348 #endif /* !CONFIG_HIBERNATION */
350 static struct dev_pm_ops of_platform_dev_pm_ops
= {
351 .prepare
= of_platform_pm_prepare
,
352 .complete
= of_platform_pm_complete
,
353 .suspend
= of_platform_pm_suspend
,
354 .resume
= of_platform_pm_resume
,
355 .freeze
= of_platform_pm_freeze
,
356 .thaw
= of_platform_pm_thaw
,
357 .poweroff
= of_platform_pm_poweroff
,
358 .restore
= of_platform_pm_restore
,
359 .suspend_noirq
= of_platform_pm_suspend_noirq
,
360 .resume_noirq
= of_platform_pm_resume_noirq
,
361 .freeze_noirq
= of_platform_pm_freeze_noirq
,
362 .thaw_noirq
= of_platform_pm_thaw_noirq
,
363 .poweroff_noirq
= of_platform_pm_poweroff_noirq
,
364 .restore_noirq
= of_platform_pm_restore_noirq
,
367 #define OF_PLATFORM_PM_OPS_PTR (&of_platform_dev_pm_ops)
369 #else /* !CONFIG_PM_SLEEP */
371 #define OF_PLATFORM_PM_OPS_PTR NULL
373 #endif /* !CONFIG_PM_SLEEP */
375 int of_bus_type_init(struct bus_type
*bus
, const char *name
)
378 bus
->match
= of_platform_bus_match
;
379 bus
->probe
= of_platform_device_probe
;
380 bus
->remove
= of_platform_device_remove
;
381 bus
->shutdown
= of_platform_device_shutdown
;
382 bus
->dev_attrs
= of_platform_device_attrs
;
383 bus
->pm
= OF_PLATFORM_PM_OPS_PTR
;
384 return bus_register(bus
);
387 int of_register_driver(struct of_platform_driver
*drv
, struct bus_type
*bus
)
389 drv
->driver
.bus
= bus
;
391 /* register with core */
392 return driver_register(&drv
->driver
);
394 EXPORT_SYMBOL(of_register_driver
);
396 void of_unregister_driver(struct of_platform_driver
*drv
)
398 driver_unregister(&drv
->driver
);
400 EXPORT_SYMBOL(of_unregister_driver
);
402 #if !defined(CONFIG_SPARC)
404 * The following routines scan a subtree and registers a device for
405 * each applicable node.
407 * Note: sparc doesn't use these routines because it has a different
408 * mechanism for creating devices from device tree nodes.
412 * of_device_make_bus_id - Use the device node data to assign a unique name
413 * @dev: pointer to device structure that is linked to a device tree node
415 * This routine will first try using either the dcr-reg or the reg property
416 * value to derive a unique name. As a last resort it will use the node
417 * name followed by a unique number.
419 static void of_device_make_bus_id(struct device
*dev
)
421 static atomic_t bus_no_reg_magic
;
422 struct device_node
*node
= dev
->of_node
;
427 #ifdef CONFIG_PPC_DCR
429 * If it's a DCR based device, use 'd' for native DCRs
430 * and 'D' for MMIO DCRs.
432 reg
= of_get_property(node
, "dcr-reg", NULL
);
434 #ifdef CONFIG_PPC_DCR_NATIVE
435 dev_set_name(dev
, "d%x.%s", *reg
, node
->name
);
436 #else /* CONFIG_PPC_DCR_NATIVE */
437 u64 addr
= of_translate_dcr_address(node
, *reg
, NULL
);
438 if (addr
!= OF_BAD_ADDR
) {
439 dev_set_name(dev
, "D%llx.%s",
440 (unsigned long long)addr
, node
->name
);
443 #endif /* !CONFIG_PPC_DCR_NATIVE */
445 #endif /* CONFIG_PPC_DCR */
448 * For MMIO, get the physical address
450 reg
= of_get_property(node
, "reg", NULL
);
452 addr
= of_translate_address(node
, reg
);
453 if (addr
!= OF_BAD_ADDR
) {
454 dev_set_name(dev
, "%llx.%s",
455 (unsigned long long)addr
, node
->name
);
461 * No BusID, use the node name and add a globally incremented
462 * counter (and pray...)
464 magic
= atomic_add_return(1, &bus_no_reg_magic
);
465 dev_set_name(dev
, "%s.%d", node
->name
, magic
- 1);
469 * of_device_alloc - Allocate and initialize an of_device
470 * @np: device node to assign to device
471 * @bus_id: Name to assign to the device. May be null to use default name.
472 * @parent: Parent device.
474 struct of_device
*of_device_alloc(struct device_node
*np
,
476 struct device
*parent
)
478 struct of_device
*dev
;
479 int rc
, i
, num_reg
= 0, num_irq
= 0;
480 struct resource
*res
, temp_res
;
482 /* First count how many resources are needed */
483 while (of_address_to_resource(np
, num_reg
, &temp_res
) == 0)
485 while (of_irq_to_resource(np
, num_irq
, &temp_res
) != NO_IRQ
)
488 /* Allocate memory for both the struct device and the resource table */
489 dev
= kzalloc(sizeof(*dev
) + (sizeof(*res
) * (num_reg
+ num_irq
)),
493 res
= (struct resource
*) &dev
[1];
495 /* Populate the resource table */
496 if (num_irq
|| num_reg
) {
497 dev
->num_resources
= num_reg
+ num_irq
;
499 for (i
= 0; i
< num_reg
; i
++, res
++) {
500 rc
= of_address_to_resource(np
, i
, res
);
503 for (i
= 0; i
< num_irq
; i
++, res
++) {
504 rc
= of_irq_to_resource(np
, i
, res
);
505 WARN_ON(rc
== NO_IRQ
);
509 dev
->dev
.of_node
= of_node_get(np
);
510 dev
->dev
.dma_mask
= &dev
->archdata
.dma_mask
;
511 dev
->dev
.parent
= parent
;
512 dev
->dev
.release
= of_release_dev
;
515 dev_set_name(&dev
->dev
, "%s", bus_id
);
517 of_device_make_bus_id(&dev
->dev
);
521 EXPORT_SYMBOL(of_device_alloc
);
524 * of_platform_device_create - Alloc, initialize and register an of_device
525 * @np: pointer to node to create device for
526 * @bus_id: name to assign device
527 * @parent: Linux device model parent device.
529 struct of_device
*of_platform_device_create(struct device_node
*np
,
531 struct device
*parent
)
533 struct of_device
*dev
;
535 dev
= of_device_alloc(np
, bus_id
, parent
);
539 dev
->archdata
.dma_mask
= 0xffffffffUL
;
540 dev
->dev
.coherent_dma_mask
= DMA_BIT_MASK(32);
541 dev
->dev
.bus
= &of_platform_bus_type
;
543 /* We do not fill the DMA ops for platform devices by default.
544 * This is currently the responsibility of the platform code
545 * to do such, possibly using a device notifier
548 if (of_device_register(dev
) != 0) {
555 EXPORT_SYMBOL(of_platform_device_create
);
558 * of_platform_bus_create - Create an OF device for a bus node and all its
559 * children. Optionally recursively instantiate matching busses.
560 * @bus: device node of the bus to instantiate
561 * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to
562 * disallow recursive creation of child busses
564 static int of_platform_bus_create(const struct device_node
*bus
,
565 const struct of_device_id
*matches
,
566 struct device
*parent
)
568 struct device_node
*child
;
569 struct of_device
*dev
;
572 for_each_child_of_node(bus
, child
) {
573 pr_debug(" create child: %s\n", child
->full_name
);
574 dev
= of_platform_device_create(child
, NULL
, parent
);
577 else if (!of_match_node(matches
, child
))
580 pr_debug(" and sub busses\n");
581 rc
= of_platform_bus_create(child
, matches
, &dev
->dev
);
592 * of_platform_bus_probe - Probe the device-tree for platform busses
593 * @root: parent of the first level to probe or NULL for the root of the tree
594 * @matches: match table, NULL to use the default
595 * @parent: parent to hook devices from, NULL for toplevel
597 * Note that children of the provided root are not instantiated as devices
598 * unless the specified root itself matches the bus list and is not NULL.
600 int of_platform_bus_probe(struct device_node
*root
,
601 const struct of_device_id
*matches
,
602 struct device
*parent
)
604 struct device_node
*child
;
605 struct of_device
*dev
;
609 matches
= of_default_bus_ids
;
610 if (matches
== OF_NO_DEEP_PROBE
)
613 root
= of_find_node_by_path("/");
617 pr_debug("of_platform_bus_probe()\n");
618 pr_debug(" starting at: %s\n", root
->full_name
);
620 /* Do a self check of bus type, if there's a match, create
623 if (of_match_node(matches
, root
)) {
624 pr_debug(" root match, create all sub devices\n");
625 dev
= of_platform_device_create(root
, NULL
, parent
);
630 pr_debug(" create all sub busses\n");
631 rc
= of_platform_bus_create(root
, matches
, &dev
->dev
);
634 for_each_child_of_node(root
, child
) {
635 if (!of_match_node(matches
, child
))
638 pr_debug(" match: %s\n", child
->full_name
);
639 dev
= of_platform_device_create(child
, NULL
, parent
);
643 rc
= of_platform_bus_create(child
, matches
, &dev
->dev
);
653 EXPORT_SYMBOL(of_platform_bus_probe
);
654 #endif /* !CONFIG_SPARC */