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
.resource
);
157 * platform_device_alloc - create a platform device
158 * @name: base name of the device we're adding
161 * Create a platform device object which can have other objects attached
162 * to it, and which will have attached objects freed when it is released.
164 struct platform_device
*platform_device_alloc(const char *name
, int id
)
166 struct platform_object
*pa
;
168 pa
= kzalloc(sizeof(struct platform_object
) + strlen(name
), GFP_KERNEL
);
170 strcpy(pa
->name
, name
);
171 pa
->pdev
.name
= pa
->name
;
173 device_initialize(&pa
->pdev
.dev
);
174 pa
->pdev
.dev
.release
= platform_device_release
;
177 return pa
? &pa
->pdev
: NULL
;
179 EXPORT_SYMBOL_GPL(platform_device_alloc
);
182 * platform_device_add_resources - add resources to a platform device
183 * @pdev: platform device allocated by platform_device_alloc to add resources to
184 * @res: set of resources that needs to be allocated for the device
185 * @num: number of resources
187 * Add a copy of the resources to the platform device. The memory
188 * associated with the resources will be freed when the platform device is
191 int platform_device_add_resources(struct platform_device
*pdev
,
192 const struct resource
*res
, unsigned int num
)
199 r
= kmemdup(res
, sizeof(struct resource
) * num
, GFP_KERNEL
);
202 pdev
->num_resources
= num
;
207 EXPORT_SYMBOL_GPL(platform_device_add_resources
);
210 * platform_device_add_data - add platform-specific data to a platform device
211 * @pdev: platform device allocated by platform_device_alloc to add resources to
212 * @data: platform specific data for this platform device
213 * @size: size of platform specific data
215 * Add a copy of platform specific data to the platform device's
216 * platform_data pointer. The memory associated with the platform data
217 * will be freed when the platform device is released.
219 int platform_device_add_data(struct platform_device
*pdev
, const void *data
,
227 d
= kmemdup(data
, size
, GFP_KERNEL
);
229 pdev
->dev
.platform_data
= d
;
234 EXPORT_SYMBOL_GPL(platform_device_add_data
);
237 * platform_device_add - add a platform device to device hierarchy
238 * @pdev: platform device we're adding
240 * This is part 2 of platform_device_register(), though may be called
241 * separately _iff_ pdev was allocated by platform_device_alloc().
243 int platform_device_add(struct platform_device
*pdev
)
250 if (!pdev
->dev
.parent
)
251 pdev
->dev
.parent
= &platform_bus
;
253 pdev
->dev
.bus
= &platform_bus_type
;
256 dev_set_name(&pdev
->dev
, "%s.%d", pdev
->name
, pdev
->id
);
258 dev_set_name(&pdev
->dev
, "%s", pdev
->name
);
260 for (i
= 0; i
< pdev
->num_resources
; i
++) {
261 struct resource
*p
, *r
= &pdev
->resource
[i
];
264 r
->name
= dev_name(&pdev
->dev
);
268 if (resource_type(r
) == IORESOURCE_MEM
)
270 else if (resource_type(r
) == IORESOURCE_IO
)
271 p
= &ioport_resource
;
274 if (p
&& insert_resource(p
, r
)) {
276 "%s: failed to claim resource %d\n",
277 dev_name(&pdev
->dev
), i
);
283 pr_debug("Registering platform device '%s'. Parent at %s\n",
284 dev_name(&pdev
->dev
), dev_name(pdev
->dev
.parent
));
286 ret
= device_add(&pdev
->dev
);
292 struct resource
*r
= &pdev
->resource
[i
];
293 unsigned long type
= resource_type(r
);
295 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
301 EXPORT_SYMBOL_GPL(platform_device_add
);
304 * platform_device_del - remove a platform-level device
305 * @pdev: platform device we're removing
307 * Note that this function will also release all memory- and port-based
308 * resources owned by the device (@dev->resource). This function must
309 * _only_ be externally called in error cases. All other usage is a bug.
311 void platform_device_del(struct platform_device
*pdev
)
316 device_del(&pdev
->dev
);
318 for (i
= 0; i
< pdev
->num_resources
; i
++) {
319 struct resource
*r
= &pdev
->resource
[i
];
320 unsigned long type
= resource_type(r
);
322 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
327 EXPORT_SYMBOL_GPL(platform_device_del
);
330 * platform_device_register - add a platform-level device
331 * @pdev: platform device we're adding
333 int platform_device_register(struct platform_device
*pdev
)
335 device_initialize(&pdev
->dev
);
336 return platform_device_add(pdev
);
338 EXPORT_SYMBOL_GPL(platform_device_register
);
341 * platform_device_unregister - unregister a platform-level device
342 * @pdev: platform device we're unregistering
344 * Unregistration is done in 2 steps. First we release all resources
345 * and remove it from the subsystem, then we drop reference count by
346 * calling platform_device_put().
348 void platform_device_unregister(struct platform_device
*pdev
)
350 platform_device_del(pdev
);
351 platform_device_put(pdev
);
353 EXPORT_SYMBOL_GPL(platform_device_unregister
);
356 * platform_device_register_resndata - add a platform-level device with
357 * resources and platform-specific data
359 * @parent: parent device for the device we're adding
360 * @name: base name of the device we're adding
362 * @res: set of resources that needs to be allocated for the device
363 * @num: number of resources
364 * @data: platform specific data for this platform device
365 * @size: size of platform specific data
367 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
369 struct platform_device
*__init_or_module
platform_device_register_resndata(
370 struct device
*parent
,
371 const char *name
, int id
,
372 const struct resource
*res
, unsigned int num
,
373 const void *data
, size_t size
)
376 struct platform_device
*pdev
;
378 pdev
= platform_device_alloc(name
, id
);
382 pdev
->dev
.parent
= parent
;
384 ret
= platform_device_add_resources(pdev
, res
, num
);
388 ret
= platform_device_add_data(pdev
, data
, size
);
392 ret
= platform_device_add(pdev
);
395 platform_device_put(pdev
);
401 EXPORT_SYMBOL_GPL(platform_device_register_resndata
);
403 static int platform_drv_probe(struct device
*_dev
)
405 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
406 struct platform_device
*dev
= to_platform_device(_dev
);
408 return drv
->probe(dev
);
411 static int platform_drv_probe_fail(struct device
*_dev
)
416 static int platform_drv_remove(struct device
*_dev
)
418 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
419 struct platform_device
*dev
= to_platform_device(_dev
);
421 return drv
->remove(dev
);
424 static void platform_drv_shutdown(struct device
*_dev
)
426 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
427 struct platform_device
*dev
= to_platform_device(_dev
);
433 * platform_driver_register - register a driver for platform-level devices
434 * @drv: platform driver structure
436 int platform_driver_register(struct platform_driver
*drv
)
438 drv
->driver
.bus
= &platform_bus_type
;
440 drv
->driver
.probe
= platform_drv_probe
;
442 drv
->driver
.remove
= platform_drv_remove
;
444 drv
->driver
.shutdown
= platform_drv_shutdown
;
446 return driver_register(&drv
->driver
);
448 EXPORT_SYMBOL_GPL(platform_driver_register
);
451 * platform_driver_unregister - unregister a driver for platform-level devices
452 * @drv: platform driver structure
454 void platform_driver_unregister(struct platform_driver
*drv
)
456 driver_unregister(&drv
->driver
);
458 EXPORT_SYMBOL_GPL(platform_driver_unregister
);
461 * platform_driver_probe - register driver for non-hotpluggable device
462 * @drv: platform driver structure
463 * @probe: the driver probe routine, probably from an __init section
465 * Use this instead of platform_driver_register() when you know the device
466 * is not hotpluggable and has already been registered, and you want to
467 * remove its run-once probe() infrastructure from memory after the driver
468 * has bound to the device.
470 * One typical use for this would be with drivers for controllers integrated
471 * into system-on-chip processors, where the controller devices have been
472 * configured as part of board setup.
474 * Returns zero if the driver registered and bound to a device, else returns
475 * a negative error code and with the driver not registered.
477 int __init_or_module
platform_driver_probe(struct platform_driver
*drv
,
478 int (*probe
)(struct platform_device
*))
482 /* make sure driver won't have bind/unbind attributes */
483 drv
->driver
.suppress_bind_attrs
= true;
485 /* temporary section violation during probe() */
487 retval
= code
= platform_driver_register(drv
);
490 * Fixup that section violation, being paranoid about code scanning
491 * the list of drivers in order to probe new devices. Check to see
492 * if the probe was successful, and make sure any forced probes of
495 spin_lock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
497 if (code
== 0 && list_empty(&drv
->driver
.p
->klist_devices
.k_list
))
499 drv
->driver
.probe
= platform_drv_probe_fail
;
500 spin_unlock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
503 platform_driver_unregister(drv
);
506 EXPORT_SYMBOL_GPL(platform_driver_probe
);
509 * platform_create_bundle - register driver and create corresponding device
510 * @driver: platform driver structure
511 * @probe: the driver probe routine, probably from an __init section
512 * @res: set of resources that needs to be allocated for the device
513 * @n_res: number of resources
514 * @data: platform specific data for this platform device
515 * @size: size of platform specific data
517 * Use this in legacy-style modules that probe hardware directly and
518 * register a single platform device and corresponding platform driver.
520 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
522 struct platform_device
* __init_or_module
platform_create_bundle(
523 struct platform_driver
*driver
,
524 int (*probe
)(struct platform_device
*),
525 struct resource
*res
, unsigned int n_res
,
526 const void *data
, size_t size
)
528 struct platform_device
*pdev
;
531 pdev
= platform_device_alloc(driver
->driver
.name
, -1);
537 error
= platform_device_add_resources(pdev
, res
, n_res
);
541 error
= platform_device_add_data(pdev
, data
, size
);
545 error
= platform_device_add(pdev
);
549 error
= platform_driver_probe(driver
, probe
);
556 platform_device_del(pdev
);
558 platform_device_put(pdev
);
560 return ERR_PTR(error
);
562 EXPORT_SYMBOL_GPL(platform_create_bundle
);
564 /* modalias support enables more hands-off userspace setup:
565 * (a) environment variable lets new-style hotplug events work once system is
566 * fully running: "modprobe $MODALIAS"
567 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
568 * mishandled before system is fully running: "modprobe $(cat modalias)"
570 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*a
,
573 struct platform_device
*pdev
= to_platform_device(dev
);
574 int len
= snprintf(buf
, PAGE_SIZE
, "platform:%s\n", pdev
->name
);
576 return (len
>= PAGE_SIZE
) ? (PAGE_SIZE
- 1) : len
;
579 static struct device_attribute platform_dev_attrs
[] = {
584 static int platform_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
586 struct platform_device
*pdev
= to_platform_device(dev
);
589 /* Some devices have extra OF data and an OF-style MODALIAS */
590 rc
= of_device_uevent(dev
,env
);
594 add_uevent_var(env
, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX
,
595 (pdev
->id_entry
) ? pdev
->id_entry
->name
: pdev
->name
);
599 static const struct platform_device_id
*platform_match_id(
600 const struct platform_device_id
*id
,
601 struct platform_device
*pdev
)
603 while (id
->name
[0]) {
604 if (strcmp(pdev
->name
, id
->name
) == 0) {
614 * platform_match - bind platform device to platform driver.
618 * Platform device IDs are assumed to be encoded like this:
619 * "<name><instance>", where <name> is a short description of the type of
620 * device, like "pci" or "floppy", and <instance> is the enumerated
621 * instance of the device, like '0' or '42'. Driver IDs are simply
622 * "<name>". So, extract the <name> from the platform_device structure,
623 * and compare it against the name of the driver. Return whether they match
626 static int platform_match(struct device
*dev
, struct device_driver
*drv
)
628 struct platform_device
*pdev
= to_platform_device(dev
);
629 struct platform_driver
*pdrv
= to_platform_driver(drv
);
631 /* Attempt an OF style match first */
632 if (of_driver_match_device(dev
, drv
))
635 /* Then try to match against the id table */
637 return platform_match_id(pdrv
->id_table
, pdev
) != NULL
;
639 /* fall-back to driver name match */
640 return (strcmp(pdev
->name
, drv
->name
) == 0);
643 #ifdef CONFIG_PM_SLEEP
645 static int platform_legacy_suspend(struct device
*dev
, pm_message_t mesg
)
647 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
648 struct platform_device
*pdev
= to_platform_device(dev
);
651 if (dev
->driver
&& pdrv
->suspend
)
652 ret
= pdrv
->suspend(pdev
, mesg
);
657 static int platform_legacy_resume(struct device
*dev
)
659 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
660 struct platform_device
*pdev
= to_platform_device(dev
);
663 if (dev
->driver
&& pdrv
->resume
)
664 ret
= pdrv
->resume(pdev
);
669 static int platform_pm_prepare(struct device
*dev
)
671 struct device_driver
*drv
= dev
->driver
;
674 if (drv
&& drv
->pm
&& drv
->pm
->prepare
)
675 ret
= drv
->pm
->prepare(dev
);
680 static void platform_pm_complete(struct device
*dev
)
682 struct device_driver
*drv
= dev
->driver
;
684 if (drv
&& drv
->pm
&& drv
->pm
->complete
)
685 drv
->pm
->complete(dev
);
688 #else /* !CONFIG_PM_SLEEP */
690 #define platform_pm_prepare NULL
691 #define platform_pm_complete NULL
693 #endif /* !CONFIG_PM_SLEEP */
695 #ifdef CONFIG_SUSPEND
697 int __weak
platform_pm_suspend(struct device
*dev
)
699 struct device_driver
*drv
= dev
->driver
;
706 if (drv
->pm
->suspend
)
707 ret
= drv
->pm
->suspend(dev
);
709 ret
= platform_legacy_suspend(dev
, PMSG_SUSPEND
);
715 int __weak
platform_pm_suspend_noirq(struct device
*dev
)
717 struct device_driver
*drv
= dev
->driver
;
724 if (drv
->pm
->suspend_noirq
)
725 ret
= drv
->pm
->suspend_noirq(dev
);
731 int __weak
platform_pm_resume(struct device
*dev
)
733 struct device_driver
*drv
= dev
->driver
;
741 ret
= drv
->pm
->resume(dev
);
743 ret
= platform_legacy_resume(dev
);
749 int __weak
platform_pm_resume_noirq(struct device
*dev
)
751 struct device_driver
*drv
= dev
->driver
;
758 if (drv
->pm
->resume_noirq
)
759 ret
= drv
->pm
->resume_noirq(dev
);
765 #else /* !CONFIG_SUSPEND */
767 #define platform_pm_suspend NULL
768 #define platform_pm_resume NULL
769 #define platform_pm_suspend_noirq NULL
770 #define platform_pm_resume_noirq NULL
772 #endif /* !CONFIG_SUSPEND */
774 #ifdef CONFIG_HIBERNATE_CALLBACKS
776 static int platform_pm_freeze(struct device
*dev
)
778 struct device_driver
*drv
= dev
->driver
;
786 ret
= drv
->pm
->freeze(dev
);
788 ret
= platform_legacy_suspend(dev
, PMSG_FREEZE
);
794 static int platform_pm_freeze_noirq(struct device
*dev
)
796 struct device_driver
*drv
= dev
->driver
;
803 if (drv
->pm
->freeze_noirq
)
804 ret
= drv
->pm
->freeze_noirq(dev
);
810 static int platform_pm_thaw(struct device
*dev
)
812 struct device_driver
*drv
= dev
->driver
;
820 ret
= drv
->pm
->thaw(dev
);
822 ret
= platform_legacy_resume(dev
);
828 static int platform_pm_thaw_noirq(struct device
*dev
)
830 struct device_driver
*drv
= dev
->driver
;
837 if (drv
->pm
->thaw_noirq
)
838 ret
= drv
->pm
->thaw_noirq(dev
);
844 static int platform_pm_poweroff(struct device
*dev
)
846 struct device_driver
*drv
= dev
->driver
;
853 if (drv
->pm
->poweroff
)
854 ret
= drv
->pm
->poweroff(dev
);
856 ret
= platform_legacy_suspend(dev
, PMSG_HIBERNATE
);
862 static int platform_pm_poweroff_noirq(struct device
*dev
)
864 struct device_driver
*drv
= dev
->driver
;
871 if (drv
->pm
->poweroff_noirq
)
872 ret
= drv
->pm
->poweroff_noirq(dev
);
878 static int platform_pm_restore(struct device
*dev
)
880 struct device_driver
*drv
= dev
->driver
;
887 if (drv
->pm
->restore
)
888 ret
= drv
->pm
->restore(dev
);
890 ret
= platform_legacy_resume(dev
);
896 static int platform_pm_restore_noirq(struct device
*dev
)
898 struct device_driver
*drv
= dev
->driver
;
905 if (drv
->pm
->restore_noirq
)
906 ret
= drv
->pm
->restore_noirq(dev
);
912 #else /* !CONFIG_HIBERNATE_CALLBACKS */
914 #define platform_pm_freeze NULL
915 #define platform_pm_thaw NULL
916 #define platform_pm_poweroff NULL
917 #define platform_pm_restore NULL
918 #define platform_pm_freeze_noirq NULL
919 #define platform_pm_thaw_noirq NULL
920 #define platform_pm_poweroff_noirq NULL
921 #define platform_pm_restore_noirq NULL
923 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
925 #ifdef CONFIG_PM_RUNTIME
927 int __weak
platform_pm_runtime_suspend(struct device
*dev
)
929 return pm_generic_runtime_suspend(dev
);
932 int __weak
platform_pm_runtime_resume(struct device
*dev
)
934 return pm_generic_runtime_resume(dev
);
937 int __weak
platform_pm_runtime_idle(struct device
*dev
)
939 return pm_generic_runtime_idle(dev
);
942 #else /* !CONFIG_PM_RUNTIME */
944 #define platform_pm_runtime_suspend NULL
945 #define platform_pm_runtime_resume NULL
946 #define platform_pm_runtime_idle NULL
948 #endif /* !CONFIG_PM_RUNTIME */
950 static const struct dev_pm_ops platform_dev_pm_ops
= {
951 .prepare
= platform_pm_prepare
,
952 .complete
= platform_pm_complete
,
953 .suspend
= platform_pm_suspend
,
954 .resume
= platform_pm_resume
,
955 .freeze
= platform_pm_freeze
,
956 .thaw
= platform_pm_thaw
,
957 .poweroff
= platform_pm_poweroff
,
958 .restore
= platform_pm_restore
,
959 .suspend_noirq
= platform_pm_suspend_noirq
,
960 .resume_noirq
= platform_pm_resume_noirq
,
961 .freeze_noirq
= platform_pm_freeze_noirq
,
962 .thaw_noirq
= platform_pm_thaw_noirq
,
963 .poweroff_noirq
= platform_pm_poweroff_noirq
,
964 .restore_noirq
= platform_pm_restore_noirq
,
965 .runtime_suspend
= platform_pm_runtime_suspend
,
966 .runtime_resume
= platform_pm_runtime_resume
,
967 .runtime_idle
= platform_pm_runtime_idle
,
970 struct bus_type platform_bus_type
= {
972 .dev_attrs
= platform_dev_attrs
,
973 .match
= platform_match
,
974 .uevent
= platform_uevent
,
975 .pm
= &platform_dev_pm_ops
,
977 EXPORT_SYMBOL_GPL(platform_bus_type
);
980 * platform_bus_get_pm_ops() - return pointer to busses dev_pm_ops
982 * This function can be used by platform code to get the current
983 * set of dev_pm_ops functions used by the platform_bus_type.
985 const struct dev_pm_ops
* __init
platform_bus_get_pm_ops(void)
987 return platform_bus_type
.pm
;
991 * platform_bus_set_pm_ops() - update dev_pm_ops for the platform_bus_type
993 * @pm: pointer to new dev_pm_ops struct to be used for platform_bus_type
995 * Platform code can override the dev_pm_ops methods of
996 * platform_bus_type by using this function. It is expected that
997 * platform code will first do a platform_bus_get_pm_ops(), then
998 * kmemdup it, then customize selected methods and pass a pointer to
999 * the new struct dev_pm_ops to this function.
1001 * Since platform-specific code is customizing methods for *all*
1002 * devices (not just platform-specific devices) it is expected that
1003 * any custom overrides of these functions will keep existing behavior
1004 * and simply extend it. For example, any customization of the
1005 * runtime PM methods should continue to call the pm_generic_*
1006 * functions as the default ones do in addition to the
1007 * platform-specific behavior.
1009 void __init
platform_bus_set_pm_ops(const struct dev_pm_ops
*pm
)
1011 platform_bus_type
.pm
= pm
;
1014 int __init
platform_bus_init(void)
1018 early_platform_cleanup();
1020 error
= device_register(&platform_bus
);
1023 error
= bus_register(&platform_bus_type
);
1025 device_unregister(&platform_bus
);
1029 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
1030 u64
dma_get_required_mask(struct device
*dev
)
1032 u32 low_totalram
= ((max_pfn
- 1) << PAGE_SHIFT
);
1033 u32 high_totalram
= ((max_pfn
- 1) >> (32 - PAGE_SHIFT
));
1036 if (!high_totalram
) {
1037 /* convert to mask just covering totalram */
1038 low_totalram
= (1 << (fls(low_totalram
) - 1));
1039 low_totalram
+= low_totalram
- 1;
1040 mask
= low_totalram
;
1042 high_totalram
= (1 << (fls(high_totalram
) - 1));
1043 high_totalram
+= high_totalram
- 1;
1044 mask
= (((u64
)high_totalram
) << 32) + 0xffffffff;
1048 EXPORT_SYMBOL_GPL(dma_get_required_mask
);
1051 static __initdata
LIST_HEAD(early_platform_driver_list
);
1052 static __initdata
LIST_HEAD(early_platform_device_list
);
1055 * early_platform_driver_register - register early platform driver
1056 * @epdrv: early_platform driver structure
1057 * @buf: string passed from early_param()
1059 * Helper function for early_platform_init() / early_platform_init_buffer()
1061 int __init
early_platform_driver_register(struct early_platform_driver
*epdrv
,
1067 /* Simply add the driver to the end of the global list.
1068 * Drivers will by default be put on the list in compiled-in order.
1070 if (!epdrv
->list
.next
) {
1071 INIT_LIST_HEAD(&epdrv
->list
);
1072 list_add_tail(&epdrv
->list
, &early_platform_driver_list
);
1075 /* If the user has specified device then make sure the driver
1076 * gets prioritized. The driver of the last device specified on
1077 * command line will be put first on the list.
1079 n
= strlen(epdrv
->pdrv
->driver
.name
);
1080 if (buf
&& !strncmp(buf
, epdrv
->pdrv
->driver
.name
, n
)) {
1081 list_move(&epdrv
->list
, &early_platform_driver_list
);
1083 /* Allow passing parameters after device name */
1084 if (buf
[n
] == '\0' || buf
[n
] == ',')
1085 epdrv
->requested_id
= -1;
1087 epdrv
->requested_id
= simple_strtoul(&buf
[n
+ 1],
1090 if (buf
[n
] != '.' || (tmp
== &buf
[n
+ 1])) {
1091 epdrv
->requested_id
= EARLY_PLATFORM_ID_ERROR
;
1094 n
+= strcspn(&buf
[n
+ 1], ",") + 1;
1100 if (epdrv
->bufsize
) {
1101 memcpy(epdrv
->buffer
, &buf
[n
],
1102 min_t(int, epdrv
->bufsize
, strlen(&buf
[n
]) + 1));
1103 epdrv
->buffer
[epdrv
->bufsize
- 1] = '\0';
1111 * early_platform_add_devices - adds a number of early platform devices
1112 * @devs: array of early platform devices to add
1113 * @num: number of early platform devices in array
1115 * Used by early architecture code to register early platform devices and
1116 * their platform data.
1118 void __init
early_platform_add_devices(struct platform_device
**devs
, int num
)
1123 /* simply add the devices to list */
1124 for (i
= 0; i
< num
; i
++) {
1125 dev
= &devs
[i
]->dev
;
1127 if (!dev
->devres_head
.next
) {
1128 INIT_LIST_HEAD(&dev
->devres_head
);
1129 list_add_tail(&dev
->devres_head
,
1130 &early_platform_device_list
);
1136 * early_platform_driver_register_all - register early platform drivers
1137 * @class_str: string to identify early platform driver class
1139 * Used by architecture code to register all early platform drivers
1140 * for a certain class. If omitted then only early platform drivers
1141 * with matching kernel command line class parameters will be registered.
1143 void __init
early_platform_driver_register_all(char *class_str
)
1145 /* The "class_str" parameter may or may not be present on the kernel
1146 * command line. If it is present then there may be more than one
1147 * matching parameter.
1149 * Since we register our early platform drivers using early_param()
1150 * we need to make sure that they also get registered in the case
1151 * when the parameter is missing from the kernel command line.
1153 * We use parse_early_options() to make sure the early_param() gets
1154 * called at least once. The early_param() may be called more than
1155 * once since the name of the preferred device may be specified on
1156 * the kernel command line. early_platform_driver_register() handles
1159 parse_early_options(class_str
);
1163 * early_platform_match - find early platform device matching driver
1164 * @epdrv: early platform driver structure
1165 * @id: id to match against
1167 static __init
struct platform_device
*
1168 early_platform_match(struct early_platform_driver
*epdrv
, int id
)
1170 struct platform_device
*pd
;
1172 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1173 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1181 * early_platform_left - check if early platform driver has matching devices
1182 * @epdrv: early platform driver structure
1183 * @id: return true if id or above exists
1185 static __init
int early_platform_left(struct early_platform_driver
*epdrv
,
1188 struct platform_device
*pd
;
1190 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1191 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1199 * early_platform_driver_probe_id - probe drivers matching class_str and id
1200 * @class_str: string to identify early platform driver class
1201 * @id: id to match against
1202 * @nr_probe: number of platform devices to successfully probe before exiting
1204 static int __init
early_platform_driver_probe_id(char *class_str
,
1208 struct early_platform_driver
*epdrv
;
1209 struct platform_device
*match
;
1214 list_for_each_entry(epdrv
, &early_platform_driver_list
, list
) {
1215 /* only use drivers matching our class_str */
1216 if (strcmp(class_str
, epdrv
->class_str
))
1220 match_id
= epdrv
->requested_id
;
1225 left
+= early_platform_left(epdrv
, id
);
1227 /* skip requested id */
1228 switch (epdrv
->requested_id
) {
1229 case EARLY_PLATFORM_ID_ERROR
:
1230 case EARLY_PLATFORM_ID_UNSET
:
1233 if (epdrv
->requested_id
== id
)
1234 match_id
= EARLY_PLATFORM_ID_UNSET
;
1239 case EARLY_PLATFORM_ID_ERROR
:
1240 pr_warning("%s: unable to parse %s parameter\n",
1241 class_str
, epdrv
->pdrv
->driver
.name
);
1243 case EARLY_PLATFORM_ID_UNSET
:
1247 match
= early_platform_match(epdrv
, match_id
);
1252 * Set up a sensible init_name to enable
1253 * dev_name() and others to be used before the
1254 * rest of the driver core is initialized.
1256 if (!match
->dev
.init_name
&& slab_is_available()) {
1257 if (match
->id
!= -1)
1258 match
->dev
.init_name
=
1259 kasprintf(GFP_KERNEL
, "%s.%d",
1263 match
->dev
.init_name
=
1264 kasprintf(GFP_KERNEL
, "%s",
1267 if (!match
->dev
.init_name
)
1271 if (epdrv
->pdrv
->probe(match
))
1272 pr_warning("%s: unable to probe %s early.\n",
1273 class_str
, match
->name
);
1289 * early_platform_driver_probe - probe a class of registered drivers
1290 * @class_str: string to identify early platform driver class
1291 * @nr_probe: number of platform devices to successfully probe before exiting
1292 * @user_only: only probe user specified early platform devices
1294 * Used by architecture code to probe registered early platform drivers
1295 * within a certain class. For probe to happen a registered early platform
1296 * device matching a registered early platform driver is needed.
1298 int __init
early_platform_driver_probe(char *class_str
,
1305 for (i
= -2; n
< nr_probe
; i
++) {
1306 k
= early_platform_driver_probe_id(class_str
, i
, nr_probe
- n
);
1321 * early_platform_cleanup - clean up early platform code
1323 void __init
early_platform_cleanup(void)
1325 struct platform_device
*pd
, *pd2
;
1327 /* clean up the devres list used to chain devices */
1328 list_for_each_entry_safe(pd
, pd2
, &early_platform_device_list
,
1330 list_del(&pd
->dev
.devres_head
);
1331 memset(&pd
->dev
.devres_head
, 0, sizeof(pd
->dev
.devres_head
));