2 * platform.c - platform 'pseudo' bus for legacy devices
4 * Copyright (c) 2002-3 Patrick Mochel
5 * Copyright (c) 2002-3 Open Source Development Labs
7 * This file is released under the GPLv2
9 * Please see Documentation/driver-model/platform.txt for more
13 #include <linux/string.h>
14 #include <linux/platform_device.h>
15 #include <linux/of_device.h>
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/bootmem.h>
20 #include <linux/err.h>
21 #include <linux/slab.h>
22 #include <linux/pm_runtime.h>
26 #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
29 struct device platform_bus
= {
30 .init_name
= "platform",
32 EXPORT_SYMBOL_GPL(platform_bus
);
35 * platform_get_resource - get a resource for a device
36 * @dev: platform device
37 * @type: resource type
38 * @num: resource index
40 struct resource
*platform_get_resource(struct platform_device
*dev
,
41 unsigned int type
, unsigned int num
)
45 for (i
= 0; i
< dev
->num_resources
; i
++) {
46 struct resource
*r
= &dev
->resource
[i
];
48 if (type
== resource_type(r
) && num
-- == 0)
53 EXPORT_SYMBOL_GPL(platform_get_resource
);
56 * platform_get_irq - get an IRQ for a device
57 * @dev: platform device
58 * @num: IRQ number index
60 int platform_get_irq(struct platform_device
*dev
, unsigned int num
)
62 struct resource
*r
= platform_get_resource(dev
, IORESOURCE_IRQ
, num
);
64 return r
? r
->start
: -ENXIO
;
66 EXPORT_SYMBOL_GPL(platform_get_irq
);
69 * platform_get_resource_byname - get a resource for a device by name
70 * @dev: platform device
71 * @type: resource type
72 * @name: resource name
74 struct resource
*platform_get_resource_byname(struct platform_device
*dev
,
80 for (i
= 0; i
< dev
->num_resources
; i
++) {
81 struct resource
*r
= &dev
->resource
[i
];
83 if (type
== resource_type(r
) && !strcmp(r
->name
, name
))
88 EXPORT_SYMBOL_GPL(platform_get_resource_byname
);
91 * platform_get_irq - get an IRQ for a device
92 * @dev: platform device
95 int platform_get_irq_byname(struct platform_device
*dev
, const char *name
)
97 struct resource
*r
= platform_get_resource_byname(dev
, IORESOURCE_IRQ
,
100 return r
? r
->start
: -ENXIO
;
102 EXPORT_SYMBOL_GPL(platform_get_irq_byname
);
105 * platform_add_devices - add a numbers of platform devices
106 * @devs: array of platform devices to add
107 * @num: number of platform devices in array
109 int platform_add_devices(struct platform_device
**devs
, int num
)
113 for (i
= 0; i
< num
; i
++) {
114 ret
= platform_device_register(devs
[i
]);
117 platform_device_unregister(devs
[i
]);
124 EXPORT_SYMBOL_GPL(platform_add_devices
);
126 struct platform_object
{
127 struct platform_device pdev
;
132 * platform_device_put - destroy a platform device
133 * @pdev: platform device to free
135 * Free all memory associated with a platform device. This function must
136 * _only_ be externally called in error cases. All other usage is a bug.
138 void platform_device_put(struct platform_device
*pdev
)
141 put_device(&pdev
->dev
);
143 EXPORT_SYMBOL_GPL(platform_device_put
);
145 static void platform_device_release(struct device
*dev
)
147 struct platform_object
*pa
= container_of(dev
, struct platform_object
,
150 of_device_node_put(&pa
->pdev
.dev
);
151 kfree(pa
->pdev
.dev
.platform_data
);
152 kfree(pa
->pdev
.mfd_cell
);
153 kfree(pa
->pdev
.resource
);
158 * platform_device_alloc - create a platform device
159 * @name: base name of the device we're adding
162 * Create a platform device object which can have other objects attached
163 * to it, and which will have attached objects freed when it is released.
165 struct platform_device
*platform_device_alloc(const char *name
, int id
)
167 struct platform_object
*pa
;
169 pa
= kzalloc(sizeof(struct platform_object
) + strlen(name
), GFP_KERNEL
);
171 strcpy(pa
->name
, name
);
172 pa
->pdev
.name
= pa
->name
;
174 device_initialize(&pa
->pdev
.dev
);
175 pa
->pdev
.dev
.release
= platform_device_release
;
178 return pa
? &pa
->pdev
: NULL
;
180 EXPORT_SYMBOL_GPL(platform_device_alloc
);
183 * platform_device_add_resources - add resources to a platform device
184 * @pdev: platform device allocated by platform_device_alloc to add resources to
185 * @res: set of resources that needs to be allocated for the device
186 * @num: number of resources
188 * Add a copy of the resources to the platform device. The memory
189 * associated with the resources will be freed when the platform device is
192 int platform_device_add_resources(struct platform_device
*pdev
,
193 const struct resource
*res
, unsigned int num
)
200 r
= kmemdup(res
, sizeof(struct resource
) * num
, GFP_KERNEL
);
203 pdev
->num_resources
= num
;
208 EXPORT_SYMBOL_GPL(platform_device_add_resources
);
211 * platform_device_add_data - add platform-specific data to a platform device
212 * @pdev: platform device allocated by platform_device_alloc to add resources to
213 * @data: platform specific data for this platform device
214 * @size: size of platform specific data
216 * Add a copy of platform specific data to the platform device's
217 * platform_data pointer. The memory associated with the platform data
218 * will be freed when the platform device is released.
220 int platform_device_add_data(struct platform_device
*pdev
, const void *data
,
226 d
= kmemdup(data
, size
, GFP_KERNEL
);
231 kfree(pdev
->dev
.platform_data
);
232 pdev
->dev
.platform_data
= d
;
235 EXPORT_SYMBOL_GPL(platform_device_add_data
);
238 * platform_device_add - add a platform device to device hierarchy
239 * @pdev: platform device we're adding
241 * This is part 2 of platform_device_register(), though may be called
242 * separately _iff_ pdev was allocated by platform_device_alloc().
244 int platform_device_add(struct platform_device
*pdev
)
251 if (!pdev
->dev
.parent
)
252 pdev
->dev
.parent
= &platform_bus
;
254 pdev
->dev
.bus
= &platform_bus_type
;
257 dev_set_name(&pdev
->dev
, "%s.%d", pdev
->name
, pdev
->id
);
259 dev_set_name(&pdev
->dev
, "%s", pdev
->name
);
261 for (i
= 0; i
< pdev
->num_resources
; i
++) {
262 struct resource
*p
, *r
= &pdev
->resource
[i
];
265 r
->name
= dev_name(&pdev
->dev
);
269 if (resource_type(r
) == IORESOURCE_MEM
)
271 else if (resource_type(r
) == IORESOURCE_IO
)
272 p
= &ioport_resource
;
275 if (p
&& insert_resource(p
, r
)) {
277 "%s: failed to claim resource %d\n",
278 dev_name(&pdev
->dev
), i
);
284 pr_debug("Registering platform device '%s'. Parent at %s\n",
285 dev_name(&pdev
->dev
), dev_name(pdev
->dev
.parent
));
287 ret
= device_add(&pdev
->dev
);
293 struct resource
*r
= &pdev
->resource
[i
];
294 unsigned long type
= resource_type(r
);
296 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
302 EXPORT_SYMBOL_GPL(platform_device_add
);
305 * platform_device_del - remove a platform-level device
306 * @pdev: platform device we're removing
308 * Note that this function will also release all memory- and port-based
309 * resources owned by the device (@dev->resource). This function must
310 * _only_ be externally called in error cases. All other usage is a bug.
312 void platform_device_del(struct platform_device
*pdev
)
317 device_del(&pdev
->dev
);
319 for (i
= 0; i
< pdev
->num_resources
; i
++) {
320 struct resource
*r
= &pdev
->resource
[i
];
321 unsigned long type
= resource_type(r
);
323 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
328 EXPORT_SYMBOL_GPL(platform_device_del
);
331 * platform_device_register - add a platform-level device
332 * @pdev: platform device we're adding
334 int platform_device_register(struct platform_device
*pdev
)
336 device_initialize(&pdev
->dev
);
337 return platform_device_add(pdev
);
339 EXPORT_SYMBOL_GPL(platform_device_register
);
342 * platform_device_unregister - unregister a platform-level device
343 * @pdev: platform device we're unregistering
345 * Unregistration is done in 2 steps. First we release all resources
346 * and remove it from the subsystem, then we drop reference count by
347 * calling platform_device_put().
349 void platform_device_unregister(struct platform_device
*pdev
)
351 platform_device_del(pdev
);
352 platform_device_put(pdev
);
354 EXPORT_SYMBOL_GPL(platform_device_unregister
);
357 * platform_device_register_resndata - add a platform-level device with
358 * resources and platform-specific data
360 * @parent: parent device for the device we're adding
361 * @name: base name of the device we're adding
363 * @res: set of resources that needs to be allocated for the device
364 * @num: number of resources
365 * @data: platform specific data for this platform device
366 * @size: size of platform specific data
368 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
370 struct platform_device
*__init_or_module
platform_device_register_resndata(
371 struct device
*parent
,
372 const char *name
, int id
,
373 const struct resource
*res
, unsigned int num
,
374 const void *data
, size_t size
)
377 struct platform_device
*pdev
;
379 pdev
= platform_device_alloc(name
, id
);
383 pdev
->dev
.parent
= parent
;
385 ret
= platform_device_add_resources(pdev
, res
, num
);
389 ret
= platform_device_add_data(pdev
, data
, size
);
393 ret
= platform_device_add(pdev
);
396 platform_device_put(pdev
);
402 EXPORT_SYMBOL_GPL(platform_device_register_resndata
);
404 static int platform_drv_probe(struct device
*_dev
)
406 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
407 struct platform_device
*dev
= to_platform_device(_dev
);
409 return drv
->probe(dev
);
412 static int platform_drv_probe_fail(struct device
*_dev
)
417 static int platform_drv_remove(struct device
*_dev
)
419 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
420 struct platform_device
*dev
= to_platform_device(_dev
);
422 return drv
->remove(dev
);
425 static void platform_drv_shutdown(struct device
*_dev
)
427 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
428 struct platform_device
*dev
= to_platform_device(_dev
);
434 * platform_driver_register - register a driver for platform-level devices
435 * @drv: platform driver structure
437 int platform_driver_register(struct platform_driver
*drv
)
439 drv
->driver
.bus
= &platform_bus_type
;
441 drv
->driver
.probe
= platform_drv_probe
;
443 drv
->driver
.remove
= platform_drv_remove
;
445 drv
->driver
.shutdown
= platform_drv_shutdown
;
447 return driver_register(&drv
->driver
);
449 EXPORT_SYMBOL_GPL(platform_driver_register
);
452 * platform_driver_unregister - unregister a driver for platform-level devices
453 * @drv: platform driver structure
455 void platform_driver_unregister(struct platform_driver
*drv
)
457 driver_unregister(&drv
->driver
);
459 EXPORT_SYMBOL_GPL(platform_driver_unregister
);
462 * platform_driver_probe - register driver for non-hotpluggable device
463 * @drv: platform driver structure
464 * @probe: the driver probe routine, probably from an __init section
466 * Use this instead of platform_driver_register() when you know the device
467 * is not hotpluggable and has already been registered, and you want to
468 * remove its run-once probe() infrastructure from memory after the driver
469 * has bound to the device.
471 * One typical use for this would be with drivers for controllers integrated
472 * into system-on-chip processors, where the controller devices have been
473 * configured as part of board setup.
475 * Returns zero if the driver registered and bound to a device, else returns
476 * a negative error code and with the driver not registered.
478 int __init_or_module
platform_driver_probe(struct platform_driver
*drv
,
479 int (*probe
)(struct platform_device
*))
483 /* make sure driver won't have bind/unbind attributes */
484 drv
->driver
.suppress_bind_attrs
= true;
486 /* temporary section violation during probe() */
488 retval
= code
= platform_driver_register(drv
);
491 * Fixup that section violation, being paranoid about code scanning
492 * the list of drivers in order to probe new devices. Check to see
493 * if the probe was successful, and make sure any forced probes of
496 spin_lock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
498 if (code
== 0 && list_empty(&drv
->driver
.p
->klist_devices
.k_list
))
500 drv
->driver
.probe
= platform_drv_probe_fail
;
501 spin_unlock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
504 platform_driver_unregister(drv
);
507 EXPORT_SYMBOL_GPL(platform_driver_probe
);
510 * platform_create_bundle - register driver and create corresponding device
511 * @driver: platform driver structure
512 * @probe: the driver probe routine, probably from an __init section
513 * @res: set of resources that needs to be allocated for the device
514 * @n_res: number of resources
515 * @data: platform specific data for this platform device
516 * @size: size of platform specific data
518 * Use this in legacy-style modules that probe hardware directly and
519 * register a single platform device and corresponding platform driver.
521 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
523 struct platform_device
* __init_or_module
platform_create_bundle(
524 struct platform_driver
*driver
,
525 int (*probe
)(struct platform_device
*),
526 struct resource
*res
, unsigned int n_res
,
527 const void *data
, size_t size
)
529 struct platform_device
*pdev
;
532 pdev
= platform_device_alloc(driver
->driver
.name
, -1);
538 error
= platform_device_add_resources(pdev
, res
, n_res
);
542 error
= platform_device_add_data(pdev
, data
, size
);
546 error
= platform_device_add(pdev
);
550 error
= platform_driver_probe(driver
, probe
);
557 platform_device_del(pdev
);
559 platform_device_put(pdev
);
561 return ERR_PTR(error
);
563 EXPORT_SYMBOL_GPL(platform_create_bundle
);
565 /* modalias support enables more hands-off userspace setup:
566 * (a) environment variable lets new-style hotplug events work once system is
567 * fully running: "modprobe $MODALIAS"
568 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
569 * mishandled before system is fully running: "modprobe $(cat modalias)"
571 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*a
,
574 struct platform_device
*pdev
= to_platform_device(dev
);
575 int len
= snprintf(buf
, PAGE_SIZE
, "platform:%s\n", pdev
->name
);
577 return (len
>= PAGE_SIZE
) ? (PAGE_SIZE
- 1) : len
;
580 static struct device_attribute platform_dev_attrs
[] = {
585 static int platform_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
587 struct platform_device
*pdev
= to_platform_device(dev
);
590 /* Some devices have extra OF data and an OF-style MODALIAS */
591 rc
= of_device_uevent(dev
,env
);
595 add_uevent_var(env
, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX
,
596 (pdev
->id_entry
) ? pdev
->id_entry
->name
: pdev
->name
);
600 static const struct platform_device_id
*platform_match_id(
601 const struct platform_device_id
*id
,
602 struct platform_device
*pdev
)
604 while (id
->name
[0]) {
605 if (strcmp(pdev
->name
, id
->name
) == 0) {
615 * platform_match - bind platform device to platform driver.
619 * Platform device IDs are assumed to be encoded like this:
620 * "<name><instance>", where <name> is a short description of the type of
621 * device, like "pci" or "floppy", and <instance> is the enumerated
622 * instance of the device, like '0' or '42'. Driver IDs are simply
623 * "<name>". So, extract the <name> from the platform_device structure,
624 * and compare it against the name of the driver. Return whether they match
627 static int platform_match(struct device
*dev
, struct device_driver
*drv
)
629 struct platform_device
*pdev
= to_platform_device(dev
);
630 struct platform_driver
*pdrv
= to_platform_driver(drv
);
632 /* Attempt an OF style match first */
633 if (of_driver_match_device(dev
, drv
))
636 /* Then try to match against the id table */
638 return platform_match_id(pdrv
->id_table
, pdev
) != NULL
;
640 /* fall-back to driver name match */
641 return (strcmp(pdev
->name
, drv
->name
) == 0);
644 #ifdef CONFIG_PM_SLEEP
646 static int platform_legacy_suspend(struct device
*dev
, pm_message_t mesg
)
648 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
649 struct platform_device
*pdev
= to_platform_device(dev
);
652 if (dev
->driver
&& pdrv
->suspend
)
653 ret
= pdrv
->suspend(pdev
, mesg
);
658 static int platform_legacy_resume(struct device
*dev
)
660 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
661 struct platform_device
*pdev
= to_platform_device(dev
);
664 if (dev
->driver
&& pdrv
->resume
)
665 ret
= pdrv
->resume(pdev
);
670 static int platform_pm_prepare(struct device
*dev
)
672 struct device_driver
*drv
= dev
->driver
;
675 if (drv
&& drv
->pm
&& drv
->pm
->prepare
)
676 ret
= drv
->pm
->prepare(dev
);
681 static void platform_pm_complete(struct device
*dev
)
683 struct device_driver
*drv
= dev
->driver
;
685 if (drv
&& drv
->pm
&& drv
->pm
->complete
)
686 drv
->pm
->complete(dev
);
689 #else /* !CONFIG_PM_SLEEP */
691 #define platform_pm_prepare NULL
692 #define platform_pm_complete NULL
694 #endif /* !CONFIG_PM_SLEEP */
696 #ifdef CONFIG_SUSPEND
698 int __weak
platform_pm_suspend(struct device
*dev
)
700 struct device_driver
*drv
= dev
->driver
;
707 if (drv
->pm
->suspend
)
708 ret
= drv
->pm
->suspend(dev
);
710 ret
= platform_legacy_suspend(dev
, PMSG_SUSPEND
);
716 int __weak
platform_pm_suspend_noirq(struct device
*dev
)
718 struct device_driver
*drv
= dev
->driver
;
725 if (drv
->pm
->suspend_noirq
)
726 ret
= drv
->pm
->suspend_noirq(dev
);
732 int __weak
platform_pm_resume(struct device
*dev
)
734 struct device_driver
*drv
= dev
->driver
;
742 ret
= drv
->pm
->resume(dev
);
744 ret
= platform_legacy_resume(dev
);
750 int __weak
platform_pm_resume_noirq(struct device
*dev
)
752 struct device_driver
*drv
= dev
->driver
;
759 if (drv
->pm
->resume_noirq
)
760 ret
= drv
->pm
->resume_noirq(dev
);
766 #else /* !CONFIG_SUSPEND */
768 #define platform_pm_suspend NULL
769 #define platform_pm_resume NULL
770 #define platform_pm_suspend_noirq NULL
771 #define platform_pm_resume_noirq NULL
773 #endif /* !CONFIG_SUSPEND */
775 #ifdef CONFIG_HIBERNATE_CALLBACKS
777 static int platform_pm_freeze(struct device
*dev
)
779 struct device_driver
*drv
= dev
->driver
;
787 ret
= drv
->pm
->freeze(dev
);
789 ret
= platform_legacy_suspend(dev
, PMSG_FREEZE
);
795 static int platform_pm_freeze_noirq(struct device
*dev
)
797 struct device_driver
*drv
= dev
->driver
;
804 if (drv
->pm
->freeze_noirq
)
805 ret
= drv
->pm
->freeze_noirq(dev
);
811 static int platform_pm_thaw(struct device
*dev
)
813 struct device_driver
*drv
= dev
->driver
;
821 ret
= drv
->pm
->thaw(dev
);
823 ret
= platform_legacy_resume(dev
);
829 static int platform_pm_thaw_noirq(struct device
*dev
)
831 struct device_driver
*drv
= dev
->driver
;
838 if (drv
->pm
->thaw_noirq
)
839 ret
= drv
->pm
->thaw_noirq(dev
);
845 static int platform_pm_poweroff(struct device
*dev
)
847 struct device_driver
*drv
= dev
->driver
;
854 if (drv
->pm
->poweroff
)
855 ret
= drv
->pm
->poweroff(dev
);
857 ret
= platform_legacy_suspend(dev
, PMSG_HIBERNATE
);
863 static int platform_pm_poweroff_noirq(struct device
*dev
)
865 struct device_driver
*drv
= dev
->driver
;
872 if (drv
->pm
->poweroff_noirq
)
873 ret
= drv
->pm
->poweroff_noirq(dev
);
879 static int platform_pm_restore(struct device
*dev
)
881 struct device_driver
*drv
= dev
->driver
;
888 if (drv
->pm
->restore
)
889 ret
= drv
->pm
->restore(dev
);
891 ret
= platform_legacy_resume(dev
);
897 static int platform_pm_restore_noirq(struct device
*dev
)
899 struct device_driver
*drv
= dev
->driver
;
906 if (drv
->pm
->restore_noirq
)
907 ret
= drv
->pm
->restore_noirq(dev
);
913 #else /* !CONFIG_HIBERNATE_CALLBACKS */
915 #define platform_pm_freeze NULL
916 #define platform_pm_thaw NULL
917 #define platform_pm_poweroff NULL
918 #define platform_pm_restore NULL
919 #define platform_pm_freeze_noirq NULL
920 #define platform_pm_thaw_noirq NULL
921 #define platform_pm_poweroff_noirq NULL
922 #define platform_pm_restore_noirq NULL
924 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
926 #ifdef CONFIG_PM_RUNTIME
928 int __weak
platform_pm_runtime_suspend(struct device
*dev
)
930 return pm_generic_runtime_suspend(dev
);
933 int __weak
platform_pm_runtime_resume(struct device
*dev
)
935 return pm_generic_runtime_resume(dev
);
938 int __weak
platform_pm_runtime_idle(struct device
*dev
)
940 return pm_generic_runtime_idle(dev
);
943 #else /* !CONFIG_PM_RUNTIME */
945 #define platform_pm_runtime_suspend NULL
946 #define platform_pm_runtime_resume NULL
947 #define platform_pm_runtime_idle NULL
949 #endif /* !CONFIG_PM_RUNTIME */
951 static const struct dev_pm_ops platform_dev_pm_ops
= {
952 .prepare
= platform_pm_prepare
,
953 .complete
= platform_pm_complete
,
954 .suspend
= platform_pm_suspend
,
955 .resume
= platform_pm_resume
,
956 .freeze
= platform_pm_freeze
,
957 .thaw
= platform_pm_thaw
,
958 .poweroff
= platform_pm_poweroff
,
959 .restore
= platform_pm_restore
,
960 .suspend_noirq
= platform_pm_suspend_noirq
,
961 .resume_noirq
= platform_pm_resume_noirq
,
962 .freeze_noirq
= platform_pm_freeze_noirq
,
963 .thaw_noirq
= platform_pm_thaw_noirq
,
964 .poweroff_noirq
= platform_pm_poweroff_noirq
,
965 .restore_noirq
= platform_pm_restore_noirq
,
966 .runtime_suspend
= platform_pm_runtime_suspend
,
967 .runtime_resume
= platform_pm_runtime_resume
,
968 .runtime_idle
= platform_pm_runtime_idle
,
971 struct bus_type platform_bus_type
= {
973 .dev_attrs
= platform_dev_attrs
,
974 .match
= platform_match
,
975 .uevent
= platform_uevent
,
976 .pm
= &platform_dev_pm_ops
,
978 EXPORT_SYMBOL_GPL(platform_bus_type
);
981 * platform_bus_get_pm_ops() - return pointer to busses dev_pm_ops
983 * This function can be used by platform code to get the current
984 * set of dev_pm_ops functions used by the platform_bus_type.
986 const struct dev_pm_ops
* __init
platform_bus_get_pm_ops(void)
988 return platform_bus_type
.pm
;
992 * platform_bus_set_pm_ops() - update dev_pm_ops for the platform_bus_type
994 * @pm: pointer to new dev_pm_ops struct to be used for platform_bus_type
996 * Platform code can override the dev_pm_ops methods of
997 * platform_bus_type by using this function. It is expected that
998 * platform code will first do a platform_bus_get_pm_ops(), then
999 * kmemdup it, then customize selected methods and pass a pointer to
1000 * the new struct dev_pm_ops to this function.
1002 * Since platform-specific code is customizing methods for *all*
1003 * devices (not just platform-specific devices) it is expected that
1004 * any custom overrides of these functions will keep existing behavior
1005 * and simply extend it. For example, any customization of the
1006 * runtime PM methods should continue to call the pm_generic_*
1007 * functions as the default ones do in addition to the
1008 * platform-specific behavior.
1010 void __init
platform_bus_set_pm_ops(const struct dev_pm_ops
*pm
)
1012 platform_bus_type
.pm
= pm
;
1015 int __init
platform_bus_init(void)
1019 early_platform_cleanup();
1021 error
= device_register(&platform_bus
);
1024 error
= bus_register(&platform_bus_type
);
1026 device_unregister(&platform_bus
);
1030 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
1031 u64
dma_get_required_mask(struct device
*dev
)
1033 u32 low_totalram
= ((max_pfn
- 1) << PAGE_SHIFT
);
1034 u32 high_totalram
= ((max_pfn
- 1) >> (32 - PAGE_SHIFT
));
1037 if (!high_totalram
) {
1038 /* convert to mask just covering totalram */
1039 low_totalram
= (1 << (fls(low_totalram
) - 1));
1040 low_totalram
+= low_totalram
- 1;
1041 mask
= low_totalram
;
1043 high_totalram
= (1 << (fls(high_totalram
) - 1));
1044 high_totalram
+= high_totalram
- 1;
1045 mask
= (((u64
)high_totalram
) << 32) + 0xffffffff;
1049 EXPORT_SYMBOL_GPL(dma_get_required_mask
);
1052 static __initdata
LIST_HEAD(early_platform_driver_list
);
1053 static __initdata
LIST_HEAD(early_platform_device_list
);
1056 * early_platform_driver_register - register early platform driver
1057 * @epdrv: early_platform driver structure
1058 * @buf: string passed from early_param()
1060 * Helper function for early_platform_init() / early_platform_init_buffer()
1062 int __init
early_platform_driver_register(struct early_platform_driver
*epdrv
,
1068 /* Simply add the driver to the end of the global list.
1069 * Drivers will by default be put on the list in compiled-in order.
1071 if (!epdrv
->list
.next
) {
1072 INIT_LIST_HEAD(&epdrv
->list
);
1073 list_add_tail(&epdrv
->list
, &early_platform_driver_list
);
1076 /* If the user has specified device then make sure the driver
1077 * gets prioritized. The driver of the last device specified on
1078 * command line will be put first on the list.
1080 n
= strlen(epdrv
->pdrv
->driver
.name
);
1081 if (buf
&& !strncmp(buf
, epdrv
->pdrv
->driver
.name
, n
)) {
1082 list_move(&epdrv
->list
, &early_platform_driver_list
);
1084 /* Allow passing parameters after device name */
1085 if (buf
[n
] == '\0' || buf
[n
] == ',')
1086 epdrv
->requested_id
= -1;
1088 epdrv
->requested_id
= simple_strtoul(&buf
[n
+ 1],
1091 if (buf
[n
] != '.' || (tmp
== &buf
[n
+ 1])) {
1092 epdrv
->requested_id
= EARLY_PLATFORM_ID_ERROR
;
1095 n
+= strcspn(&buf
[n
+ 1], ",") + 1;
1101 if (epdrv
->bufsize
) {
1102 memcpy(epdrv
->buffer
, &buf
[n
],
1103 min_t(int, epdrv
->bufsize
, strlen(&buf
[n
]) + 1));
1104 epdrv
->buffer
[epdrv
->bufsize
- 1] = '\0';
1112 * early_platform_add_devices - adds a number of early platform devices
1113 * @devs: array of early platform devices to add
1114 * @num: number of early platform devices in array
1116 * Used by early architecture code to register early platform devices and
1117 * their platform data.
1119 void __init
early_platform_add_devices(struct platform_device
**devs
, int num
)
1124 /* simply add the devices to list */
1125 for (i
= 0; i
< num
; i
++) {
1126 dev
= &devs
[i
]->dev
;
1128 if (!dev
->devres_head
.next
) {
1129 INIT_LIST_HEAD(&dev
->devres_head
);
1130 list_add_tail(&dev
->devres_head
,
1131 &early_platform_device_list
);
1137 * early_platform_driver_register_all - register early platform drivers
1138 * @class_str: string to identify early platform driver class
1140 * Used by architecture code to register all early platform drivers
1141 * for a certain class. If omitted then only early platform drivers
1142 * with matching kernel command line class parameters will be registered.
1144 void __init
early_platform_driver_register_all(char *class_str
)
1146 /* The "class_str" parameter may or may not be present on the kernel
1147 * command line. If it is present then there may be more than one
1148 * matching parameter.
1150 * Since we register our early platform drivers using early_param()
1151 * we need to make sure that they also get registered in the case
1152 * when the parameter is missing from the kernel command line.
1154 * We use parse_early_options() to make sure the early_param() gets
1155 * called at least once. The early_param() may be called more than
1156 * once since the name of the preferred device may be specified on
1157 * the kernel command line. early_platform_driver_register() handles
1160 parse_early_options(class_str
);
1164 * early_platform_match - find early platform device matching driver
1165 * @epdrv: early platform driver structure
1166 * @id: id to match against
1168 static __init
struct platform_device
*
1169 early_platform_match(struct early_platform_driver
*epdrv
, int id
)
1171 struct platform_device
*pd
;
1173 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1174 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1182 * early_platform_left - check if early platform driver has matching devices
1183 * @epdrv: early platform driver structure
1184 * @id: return true if id or above exists
1186 static __init
int early_platform_left(struct early_platform_driver
*epdrv
,
1189 struct platform_device
*pd
;
1191 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1192 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1200 * early_platform_driver_probe_id - probe drivers matching class_str and id
1201 * @class_str: string to identify early platform driver class
1202 * @id: id to match against
1203 * @nr_probe: number of platform devices to successfully probe before exiting
1205 static int __init
early_platform_driver_probe_id(char *class_str
,
1209 struct early_platform_driver
*epdrv
;
1210 struct platform_device
*match
;
1215 list_for_each_entry(epdrv
, &early_platform_driver_list
, list
) {
1216 /* only use drivers matching our class_str */
1217 if (strcmp(class_str
, epdrv
->class_str
))
1221 match_id
= epdrv
->requested_id
;
1226 left
+= early_platform_left(epdrv
, id
);
1228 /* skip requested id */
1229 switch (epdrv
->requested_id
) {
1230 case EARLY_PLATFORM_ID_ERROR
:
1231 case EARLY_PLATFORM_ID_UNSET
:
1234 if (epdrv
->requested_id
== id
)
1235 match_id
= EARLY_PLATFORM_ID_UNSET
;
1240 case EARLY_PLATFORM_ID_ERROR
:
1241 pr_warning("%s: unable to parse %s parameter\n",
1242 class_str
, epdrv
->pdrv
->driver
.name
);
1244 case EARLY_PLATFORM_ID_UNSET
:
1248 match
= early_platform_match(epdrv
, match_id
);
1253 * Set up a sensible init_name to enable
1254 * dev_name() and others to be used before the
1255 * rest of the driver core is initialized.
1257 if (!match
->dev
.init_name
&& slab_is_available()) {
1258 if (match
->id
!= -1)
1259 match
->dev
.init_name
=
1260 kasprintf(GFP_KERNEL
, "%s.%d",
1264 match
->dev
.init_name
=
1265 kasprintf(GFP_KERNEL
, "%s",
1268 if (!match
->dev
.init_name
)
1272 if (epdrv
->pdrv
->probe(match
))
1273 pr_warning("%s: unable to probe %s early.\n",
1274 class_str
, match
->name
);
1290 * early_platform_driver_probe - probe a class of registered drivers
1291 * @class_str: string to identify early platform driver class
1292 * @nr_probe: number of platform devices to successfully probe before exiting
1293 * @user_only: only probe user specified early platform devices
1295 * Used by architecture code to probe registered early platform drivers
1296 * within a certain class. For probe to happen a registered early platform
1297 * device matching a registered early platform driver is needed.
1299 int __init
early_platform_driver_probe(char *class_str
,
1306 for (i
= -2; n
< nr_probe
; i
++) {
1307 k
= early_platform_driver_probe_id(class_str
, i
, nr_probe
- n
);
1322 * early_platform_cleanup - clean up early platform code
1324 void __init
early_platform_cleanup(void)
1326 struct platform_device
*pd
, *pd2
;
1328 /* clean up the devres list used to chain devices */
1329 list_for_each_entry_safe(pd
, pd2
, &early_platform_device_list
,
1331 list_del(&pd
->dev
.devres_head
);
1332 memset(&pd
->dev
.devres_head
, 0, sizeof(pd
->dev
.devres_head
));