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 kfree(pa
->pdev
.dev
.platform_data
);
151 kfree(pa
->pdev
.resource
);
156 * platform_device_alloc - create a platform device
157 * @name: base name of the device we're adding
160 * Create a platform device object which can have other objects attached
161 * to it, and which will have attached objects freed when it is released.
163 struct platform_device
*platform_device_alloc(const char *name
, int id
)
165 struct platform_object
*pa
;
167 pa
= kzalloc(sizeof(struct platform_object
) + strlen(name
), GFP_KERNEL
);
169 strcpy(pa
->name
, name
);
170 pa
->pdev
.name
= pa
->name
;
172 device_initialize(&pa
->pdev
.dev
);
173 pa
->pdev
.dev
.release
= platform_device_release
;
176 return pa
? &pa
->pdev
: NULL
;
178 EXPORT_SYMBOL_GPL(platform_device_alloc
);
181 * platform_device_add_resources - add resources to a platform device
182 * @pdev: platform device allocated by platform_device_alloc to add resources to
183 * @res: set of resources that needs to be allocated for the device
184 * @num: number of resources
186 * Add a copy of the resources to the platform device. The memory
187 * associated with the resources will be freed when the platform device is
190 int platform_device_add_resources(struct platform_device
*pdev
,
191 const struct resource
*res
, unsigned int num
)
198 r
= kmemdup(res
, sizeof(struct resource
) * num
, GFP_KERNEL
);
201 pdev
->num_resources
= num
;
206 EXPORT_SYMBOL_GPL(platform_device_add_resources
);
209 * platform_device_add_data - add platform-specific data to a platform device
210 * @pdev: platform device allocated by platform_device_alloc to add resources to
211 * @data: platform specific data for this platform device
212 * @size: size of platform specific data
214 * Add a copy of platform specific data to the platform device's
215 * platform_data pointer. The memory associated with the platform data
216 * will be freed when the platform device is released.
218 int platform_device_add_data(struct platform_device
*pdev
, const void *data
,
226 d
= kmemdup(data
, size
, GFP_KERNEL
);
228 pdev
->dev
.platform_data
= d
;
233 EXPORT_SYMBOL_GPL(platform_device_add_data
);
236 * platform_device_add - add a platform device to device hierarchy
237 * @pdev: platform device we're adding
239 * This is part 2 of platform_device_register(), though may be called
240 * separately _iff_ pdev was allocated by platform_device_alloc().
242 int platform_device_add(struct platform_device
*pdev
)
249 if (!pdev
->dev
.parent
)
250 pdev
->dev
.parent
= &platform_bus
;
252 pdev
->dev
.bus
= &platform_bus_type
;
255 dev_set_name(&pdev
->dev
, "%s.%d", pdev
->name
, pdev
->id
);
257 dev_set_name(&pdev
->dev
, "%s", pdev
->name
);
259 for (i
= 0; i
< pdev
->num_resources
; i
++) {
260 struct resource
*p
, *r
= &pdev
->resource
[i
];
263 r
->name
= dev_name(&pdev
->dev
);
267 if (resource_type(r
) == IORESOURCE_MEM
)
269 else if (resource_type(r
) == IORESOURCE_IO
)
270 p
= &ioport_resource
;
273 if (p
&& insert_resource(p
, r
)) {
275 "%s: failed to claim resource %d\n",
276 dev_name(&pdev
->dev
), i
);
282 pr_debug("Registering platform device '%s'. Parent at %s\n",
283 dev_name(&pdev
->dev
), dev_name(pdev
->dev
.parent
));
285 ret
= device_add(&pdev
->dev
);
291 struct resource
*r
= &pdev
->resource
[i
];
292 unsigned long type
= resource_type(r
);
294 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
300 EXPORT_SYMBOL_GPL(platform_device_add
);
303 * platform_device_del - remove a platform-level device
304 * @pdev: platform device we're removing
306 * Note that this function will also release all memory- and port-based
307 * resources owned by the device (@dev->resource). This function must
308 * _only_ be externally called in error cases. All other usage is a bug.
310 void platform_device_del(struct platform_device
*pdev
)
315 device_del(&pdev
->dev
);
317 for (i
= 0; i
< pdev
->num_resources
; i
++) {
318 struct resource
*r
= &pdev
->resource
[i
];
319 unsigned long type
= resource_type(r
);
321 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
326 EXPORT_SYMBOL_GPL(platform_device_del
);
329 * platform_device_register - add a platform-level device
330 * @pdev: platform device we're adding
332 int platform_device_register(struct platform_device
*pdev
)
334 device_initialize(&pdev
->dev
);
335 return platform_device_add(pdev
);
337 EXPORT_SYMBOL_GPL(platform_device_register
);
340 * platform_device_unregister - unregister a platform-level device
341 * @pdev: platform device we're unregistering
343 * Unregistration is done in 2 steps. First we release all resources
344 * and remove it from the subsystem, then we drop reference count by
345 * calling platform_device_put().
347 void platform_device_unregister(struct platform_device
*pdev
)
349 platform_device_del(pdev
);
350 platform_device_put(pdev
);
352 EXPORT_SYMBOL_GPL(platform_device_unregister
);
355 * platform_device_register_resndata - add a platform-level device with
356 * resources and platform-specific data
358 * @parent: parent device for the device we're adding
359 * @name: base name of the device we're adding
361 * @res: set of resources that needs to be allocated for the device
362 * @num: number of resources
363 * @data: platform specific data for this platform device
364 * @size: size of platform specific data
366 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
368 struct platform_device
*__init_or_module
platform_device_register_resndata(
369 struct device
*parent
,
370 const char *name
, int id
,
371 const struct resource
*res
, unsigned int num
,
372 const void *data
, size_t size
)
375 struct platform_device
*pdev
;
377 pdev
= platform_device_alloc(name
, id
);
381 pdev
->dev
.parent
= parent
;
383 ret
= platform_device_add_resources(pdev
, res
, num
);
387 ret
= platform_device_add_data(pdev
, data
, size
);
391 ret
= platform_device_add(pdev
);
394 platform_device_put(pdev
);
400 EXPORT_SYMBOL_GPL(platform_device_register_resndata
);
402 static int platform_drv_probe(struct device
*_dev
)
404 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
405 struct platform_device
*dev
= to_platform_device(_dev
);
407 return drv
->probe(dev
);
410 static int platform_drv_probe_fail(struct device
*_dev
)
415 static int platform_drv_remove(struct device
*_dev
)
417 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
418 struct platform_device
*dev
= to_platform_device(_dev
);
420 return drv
->remove(dev
);
423 static void platform_drv_shutdown(struct device
*_dev
)
425 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
426 struct platform_device
*dev
= to_platform_device(_dev
);
432 * platform_driver_register - register a driver for platform-level devices
433 * @drv: platform driver structure
435 int platform_driver_register(struct platform_driver
*drv
)
437 drv
->driver
.bus
= &platform_bus_type
;
439 drv
->driver
.probe
= platform_drv_probe
;
441 drv
->driver
.remove
= platform_drv_remove
;
443 drv
->driver
.shutdown
= platform_drv_shutdown
;
445 return driver_register(&drv
->driver
);
447 EXPORT_SYMBOL_GPL(platform_driver_register
);
450 * platform_driver_unregister - unregister a driver for platform-level devices
451 * @drv: platform driver structure
453 void platform_driver_unregister(struct platform_driver
*drv
)
455 driver_unregister(&drv
->driver
);
457 EXPORT_SYMBOL_GPL(platform_driver_unregister
);
460 * platform_driver_probe - register driver for non-hotpluggable device
461 * @drv: platform driver structure
462 * @probe: the driver probe routine, probably from an __init section
464 * Use this instead of platform_driver_register() when you know the device
465 * is not hotpluggable and has already been registered, and you want to
466 * remove its run-once probe() infrastructure from memory after the driver
467 * has bound to the device.
469 * One typical use for this would be with drivers for controllers integrated
470 * into system-on-chip processors, where the controller devices have been
471 * configured as part of board setup.
473 * Returns zero if the driver registered and bound to a device, else returns
474 * a negative error code and with the driver not registered.
476 int __init_or_module
platform_driver_probe(struct platform_driver
*drv
,
477 int (*probe
)(struct platform_device
*))
481 /* make sure driver won't have bind/unbind attributes */
482 drv
->driver
.suppress_bind_attrs
= true;
484 /* temporary section violation during probe() */
486 retval
= code
= platform_driver_register(drv
);
489 * Fixup that section violation, being paranoid about code scanning
490 * the list of drivers in order to probe new devices. Check to see
491 * if the probe was successful, and make sure any forced probes of
494 spin_lock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
496 if (code
== 0 && list_empty(&drv
->driver
.p
->klist_devices
.k_list
))
498 drv
->driver
.probe
= platform_drv_probe_fail
;
499 spin_unlock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
502 platform_driver_unregister(drv
);
505 EXPORT_SYMBOL_GPL(platform_driver_probe
);
508 * platform_create_bundle - register driver and create corresponding device
509 * @driver: platform driver structure
510 * @probe: the driver probe routine, probably from an __init section
511 * @res: set of resources that needs to be allocated for the device
512 * @n_res: number of resources
513 * @data: platform specific data for this platform device
514 * @size: size of platform specific data
516 * Use this in legacy-style modules that probe hardware directly and
517 * register a single platform device and corresponding platform driver.
519 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
521 struct platform_device
* __init_or_module
platform_create_bundle(
522 struct platform_driver
*driver
,
523 int (*probe
)(struct platform_device
*),
524 struct resource
*res
, unsigned int n_res
,
525 const void *data
, size_t size
)
527 struct platform_device
*pdev
;
530 pdev
= platform_device_alloc(driver
->driver
.name
, -1);
536 error
= platform_device_add_resources(pdev
, res
, n_res
);
540 error
= platform_device_add_data(pdev
, data
, size
);
544 error
= platform_device_add(pdev
);
548 error
= platform_driver_probe(driver
, probe
);
555 platform_device_del(pdev
);
557 platform_device_put(pdev
);
559 return ERR_PTR(error
);
561 EXPORT_SYMBOL_GPL(platform_create_bundle
);
563 /* modalias support enables more hands-off userspace setup:
564 * (a) environment variable lets new-style hotplug events work once system is
565 * fully running: "modprobe $MODALIAS"
566 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
567 * mishandled before system is fully running: "modprobe $(cat modalias)"
569 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*a
,
572 struct platform_device
*pdev
= to_platform_device(dev
);
573 int len
= snprintf(buf
, PAGE_SIZE
, "platform:%s\n", pdev
->name
);
575 return (len
>= PAGE_SIZE
) ? (PAGE_SIZE
- 1) : len
;
578 static struct device_attribute platform_dev_attrs
[] = {
583 static int platform_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
585 struct platform_device
*pdev
= to_platform_device(dev
);
588 /* Some devices have extra OF data and an OF-style MODALIAS */
589 rc
= of_device_uevent(dev
,env
);
593 add_uevent_var(env
, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX
,
594 (pdev
->id_entry
) ? pdev
->id_entry
->name
: pdev
->name
);
598 static const struct platform_device_id
*platform_match_id(
599 const struct platform_device_id
*id
,
600 struct platform_device
*pdev
)
602 while (id
->name
[0]) {
603 if (strcmp(pdev
->name
, id
->name
) == 0) {
613 * platform_match - bind platform device to platform driver.
617 * Platform device IDs are assumed to be encoded like this:
618 * "<name><instance>", where <name> is a short description of the type of
619 * device, like "pci" or "floppy", and <instance> is the enumerated
620 * instance of the device, like '0' or '42'. Driver IDs are simply
621 * "<name>". So, extract the <name> from the platform_device structure,
622 * and compare it against the name of the driver. Return whether they match
625 static int platform_match(struct device
*dev
, struct device_driver
*drv
)
627 struct platform_device
*pdev
= to_platform_device(dev
);
628 struct platform_driver
*pdrv
= to_platform_driver(drv
);
630 /* Attempt an OF style match first */
631 if (of_driver_match_device(dev
, drv
))
634 /* Then try to match against the id table */
636 return platform_match_id(pdrv
->id_table
, pdev
) != NULL
;
638 /* fall-back to driver name match */
639 return (strcmp(pdev
->name
, drv
->name
) == 0);
642 #ifdef CONFIG_PM_SLEEP
644 static int platform_legacy_suspend(struct device
*dev
, pm_message_t mesg
)
646 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
647 struct platform_device
*pdev
= to_platform_device(dev
);
650 if (dev
->driver
&& pdrv
->suspend
)
651 ret
= pdrv
->suspend(pdev
, mesg
);
656 static int platform_legacy_resume(struct device
*dev
)
658 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
659 struct platform_device
*pdev
= to_platform_device(dev
);
662 if (dev
->driver
&& pdrv
->resume
)
663 ret
= pdrv
->resume(pdev
);
668 static int platform_pm_prepare(struct device
*dev
)
670 struct device_driver
*drv
= dev
->driver
;
673 if (drv
&& drv
->pm
&& drv
->pm
->prepare
)
674 ret
= drv
->pm
->prepare(dev
);
679 static void platform_pm_complete(struct device
*dev
)
681 struct device_driver
*drv
= dev
->driver
;
683 if (drv
&& drv
->pm
&& drv
->pm
->complete
)
684 drv
->pm
->complete(dev
);
687 #else /* !CONFIG_PM_SLEEP */
689 #define platform_pm_prepare NULL
690 #define platform_pm_complete NULL
692 #endif /* !CONFIG_PM_SLEEP */
694 #ifdef CONFIG_SUSPEND
696 int __weak
platform_pm_suspend(struct device
*dev
)
698 struct device_driver
*drv
= dev
->driver
;
705 if (drv
->pm
->suspend
)
706 ret
= drv
->pm
->suspend(dev
);
708 ret
= platform_legacy_suspend(dev
, PMSG_SUSPEND
);
714 int __weak
platform_pm_suspend_noirq(struct device
*dev
)
716 struct device_driver
*drv
= dev
->driver
;
723 if (drv
->pm
->suspend_noirq
)
724 ret
= drv
->pm
->suspend_noirq(dev
);
730 int __weak
platform_pm_resume(struct device
*dev
)
732 struct device_driver
*drv
= dev
->driver
;
740 ret
= drv
->pm
->resume(dev
);
742 ret
= platform_legacy_resume(dev
);
748 int __weak
platform_pm_resume_noirq(struct device
*dev
)
750 struct device_driver
*drv
= dev
->driver
;
757 if (drv
->pm
->resume_noirq
)
758 ret
= drv
->pm
->resume_noirq(dev
);
764 #else /* !CONFIG_SUSPEND */
766 #define platform_pm_suspend NULL
767 #define platform_pm_resume NULL
768 #define platform_pm_suspend_noirq NULL
769 #define platform_pm_resume_noirq NULL
771 #endif /* !CONFIG_SUSPEND */
773 #ifdef CONFIG_HIBERNATION
775 static int platform_pm_freeze(struct device
*dev
)
777 struct device_driver
*drv
= dev
->driver
;
785 ret
= drv
->pm
->freeze(dev
);
787 ret
= platform_legacy_suspend(dev
, PMSG_FREEZE
);
793 static int platform_pm_freeze_noirq(struct device
*dev
)
795 struct device_driver
*drv
= dev
->driver
;
802 if (drv
->pm
->freeze_noirq
)
803 ret
= drv
->pm
->freeze_noirq(dev
);
809 static int platform_pm_thaw(struct device
*dev
)
811 struct device_driver
*drv
= dev
->driver
;
819 ret
= drv
->pm
->thaw(dev
);
821 ret
= platform_legacy_resume(dev
);
827 static int platform_pm_thaw_noirq(struct device
*dev
)
829 struct device_driver
*drv
= dev
->driver
;
836 if (drv
->pm
->thaw_noirq
)
837 ret
= drv
->pm
->thaw_noirq(dev
);
843 static int platform_pm_poweroff(struct device
*dev
)
845 struct device_driver
*drv
= dev
->driver
;
852 if (drv
->pm
->poweroff
)
853 ret
= drv
->pm
->poweroff(dev
);
855 ret
= platform_legacy_suspend(dev
, PMSG_HIBERNATE
);
861 static int platform_pm_poweroff_noirq(struct device
*dev
)
863 struct device_driver
*drv
= dev
->driver
;
870 if (drv
->pm
->poweroff_noirq
)
871 ret
= drv
->pm
->poweroff_noirq(dev
);
877 static int platform_pm_restore(struct device
*dev
)
879 struct device_driver
*drv
= dev
->driver
;
886 if (drv
->pm
->restore
)
887 ret
= drv
->pm
->restore(dev
);
889 ret
= platform_legacy_resume(dev
);
895 static int platform_pm_restore_noirq(struct device
*dev
)
897 struct device_driver
*drv
= dev
->driver
;
904 if (drv
->pm
->restore_noirq
)
905 ret
= drv
->pm
->restore_noirq(dev
);
911 #else /* !CONFIG_HIBERNATION */
913 #define platform_pm_freeze NULL
914 #define platform_pm_thaw NULL
915 #define platform_pm_poweroff NULL
916 #define platform_pm_restore NULL
917 #define platform_pm_freeze_noirq NULL
918 #define platform_pm_thaw_noirq NULL
919 #define platform_pm_poweroff_noirq NULL
920 #define platform_pm_restore_noirq NULL
922 #endif /* !CONFIG_HIBERNATION */
924 #ifdef CONFIG_PM_RUNTIME
926 int __weak
platform_pm_runtime_suspend(struct device
*dev
)
928 return pm_generic_runtime_suspend(dev
);
931 int __weak
platform_pm_runtime_resume(struct device
*dev
)
933 return pm_generic_runtime_resume(dev
);
936 int __weak
platform_pm_runtime_idle(struct device
*dev
)
938 return pm_generic_runtime_idle(dev
);
941 #else /* !CONFIG_PM_RUNTIME */
943 #define platform_pm_runtime_suspend NULL
944 #define platform_pm_runtime_resume NULL
945 #define platform_pm_runtime_idle NULL
947 #endif /* !CONFIG_PM_RUNTIME */
949 static const struct dev_pm_ops platform_dev_pm_ops
= {
950 .prepare
= platform_pm_prepare
,
951 .complete
= platform_pm_complete
,
952 .suspend
= platform_pm_suspend
,
953 .resume
= platform_pm_resume
,
954 .freeze
= platform_pm_freeze
,
955 .thaw
= platform_pm_thaw
,
956 .poweroff
= platform_pm_poweroff
,
957 .restore
= platform_pm_restore
,
958 .suspend_noirq
= platform_pm_suspend_noirq
,
959 .resume_noirq
= platform_pm_resume_noirq
,
960 .freeze_noirq
= platform_pm_freeze_noirq
,
961 .thaw_noirq
= platform_pm_thaw_noirq
,
962 .poweroff_noirq
= platform_pm_poweroff_noirq
,
963 .restore_noirq
= platform_pm_restore_noirq
,
964 .runtime_suspend
= platform_pm_runtime_suspend
,
965 .runtime_resume
= platform_pm_runtime_resume
,
966 .runtime_idle
= platform_pm_runtime_idle
,
969 struct bus_type platform_bus_type
= {
971 .dev_attrs
= platform_dev_attrs
,
972 .match
= platform_match
,
973 .uevent
= platform_uevent
,
974 .pm
= &platform_dev_pm_ops
,
976 EXPORT_SYMBOL_GPL(platform_bus_type
);
979 * platform_bus_get_pm_ops() - return pointer to busses dev_pm_ops
981 * This function can be used by platform code to get the current
982 * set of dev_pm_ops functions used by the platform_bus_type.
984 const struct dev_pm_ops
* __init
platform_bus_get_pm_ops(void)
986 return platform_bus_type
.pm
;
990 * platform_bus_set_pm_ops() - update dev_pm_ops for the platform_bus_type
992 * @pm: pointer to new dev_pm_ops struct to be used for platform_bus_type
994 * Platform code can override the dev_pm_ops methods of
995 * platform_bus_type by using this function. It is expected that
996 * platform code will first do a platform_bus_get_pm_ops(), then
997 * kmemdup it, then customize selected methods and pass a pointer to
998 * the new struct dev_pm_ops to this function.
1000 * Since platform-specific code is customizing methods for *all*
1001 * devices (not just platform-specific devices) it is expected that
1002 * any custom overrides of these functions will keep existing behavior
1003 * and simply extend it. For example, any customization of the
1004 * runtime PM methods should continue to call the pm_generic_*
1005 * functions as the default ones do in addition to the
1006 * platform-specific behavior.
1008 void __init
platform_bus_set_pm_ops(const struct dev_pm_ops
*pm
)
1010 platform_bus_type
.pm
= pm
;
1013 int __init
platform_bus_init(void)
1017 early_platform_cleanup();
1019 error
= device_register(&platform_bus
);
1022 error
= bus_register(&platform_bus_type
);
1024 device_unregister(&platform_bus
);
1028 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
1029 u64
dma_get_required_mask(struct device
*dev
)
1031 u32 low_totalram
= ((max_pfn
- 1) << PAGE_SHIFT
);
1032 u32 high_totalram
= ((max_pfn
- 1) >> (32 - PAGE_SHIFT
));
1035 if (!high_totalram
) {
1036 /* convert to mask just covering totalram */
1037 low_totalram
= (1 << (fls(low_totalram
) - 1));
1038 low_totalram
+= low_totalram
- 1;
1039 mask
= low_totalram
;
1041 high_totalram
= (1 << (fls(high_totalram
) - 1));
1042 high_totalram
+= high_totalram
- 1;
1043 mask
= (((u64
)high_totalram
) << 32) + 0xffffffff;
1047 EXPORT_SYMBOL_GPL(dma_get_required_mask
);
1050 static __initdata
LIST_HEAD(early_platform_driver_list
);
1051 static __initdata
LIST_HEAD(early_platform_device_list
);
1054 * early_platform_driver_register - register early platform driver
1055 * @epdrv: early_platform driver structure
1056 * @buf: string passed from early_param()
1058 * Helper function for early_platform_init() / early_platform_init_buffer()
1060 int __init
early_platform_driver_register(struct early_platform_driver
*epdrv
,
1066 /* Simply add the driver to the end of the global list.
1067 * Drivers will by default be put on the list in compiled-in order.
1069 if (!epdrv
->list
.next
) {
1070 INIT_LIST_HEAD(&epdrv
->list
);
1071 list_add_tail(&epdrv
->list
, &early_platform_driver_list
);
1074 /* If the user has specified device then make sure the driver
1075 * gets prioritized. The driver of the last device specified on
1076 * command line will be put first on the list.
1078 n
= strlen(epdrv
->pdrv
->driver
.name
);
1079 if (buf
&& !strncmp(buf
, epdrv
->pdrv
->driver
.name
, n
)) {
1080 list_move(&epdrv
->list
, &early_platform_driver_list
);
1082 /* Allow passing parameters after device name */
1083 if (buf
[n
] == '\0' || buf
[n
] == ',')
1084 epdrv
->requested_id
= -1;
1086 epdrv
->requested_id
= simple_strtoul(&buf
[n
+ 1],
1089 if (buf
[n
] != '.' || (tmp
== &buf
[n
+ 1])) {
1090 epdrv
->requested_id
= EARLY_PLATFORM_ID_ERROR
;
1093 n
+= strcspn(&buf
[n
+ 1], ",") + 1;
1099 if (epdrv
->bufsize
) {
1100 memcpy(epdrv
->buffer
, &buf
[n
],
1101 min_t(int, epdrv
->bufsize
, strlen(&buf
[n
]) + 1));
1102 epdrv
->buffer
[epdrv
->bufsize
- 1] = '\0';
1110 * early_platform_add_devices - adds a number of early platform devices
1111 * @devs: array of early platform devices to add
1112 * @num: number of early platform devices in array
1114 * Used by early architecture code to register early platform devices and
1115 * their platform data.
1117 void __init
early_platform_add_devices(struct platform_device
**devs
, int num
)
1122 /* simply add the devices to list */
1123 for (i
= 0; i
< num
; i
++) {
1124 dev
= &devs
[i
]->dev
;
1126 if (!dev
->devres_head
.next
) {
1127 INIT_LIST_HEAD(&dev
->devres_head
);
1128 list_add_tail(&dev
->devres_head
,
1129 &early_platform_device_list
);
1135 * early_platform_driver_register_all - register early platform drivers
1136 * @class_str: string to identify early platform driver class
1138 * Used by architecture code to register all early platform drivers
1139 * for a certain class. If omitted then only early platform drivers
1140 * with matching kernel command line class parameters will be registered.
1142 void __init
early_platform_driver_register_all(char *class_str
)
1144 /* The "class_str" parameter may or may not be present on the kernel
1145 * command line. If it is present then there may be more than one
1146 * matching parameter.
1148 * Since we register our early platform drivers using early_param()
1149 * we need to make sure that they also get registered in the case
1150 * when the parameter is missing from the kernel command line.
1152 * We use parse_early_options() to make sure the early_param() gets
1153 * called at least once. The early_param() may be called more than
1154 * once since the name of the preferred device may be specified on
1155 * the kernel command line. early_platform_driver_register() handles
1158 parse_early_options(class_str
);
1162 * early_platform_match - find early platform device matching driver
1163 * @epdrv: early platform driver structure
1164 * @id: id to match against
1166 static __init
struct platform_device
*
1167 early_platform_match(struct early_platform_driver
*epdrv
, int id
)
1169 struct platform_device
*pd
;
1171 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1172 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1180 * early_platform_left - check if early platform driver has matching devices
1181 * @epdrv: early platform driver structure
1182 * @id: return true if id or above exists
1184 static __init
int early_platform_left(struct early_platform_driver
*epdrv
,
1187 struct platform_device
*pd
;
1189 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1190 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1198 * early_platform_driver_probe_id - probe drivers matching class_str and id
1199 * @class_str: string to identify early platform driver class
1200 * @id: id to match against
1201 * @nr_probe: number of platform devices to successfully probe before exiting
1203 static int __init
early_platform_driver_probe_id(char *class_str
,
1207 struct early_platform_driver
*epdrv
;
1208 struct platform_device
*match
;
1213 list_for_each_entry(epdrv
, &early_platform_driver_list
, list
) {
1214 /* only use drivers matching our class_str */
1215 if (strcmp(class_str
, epdrv
->class_str
))
1219 match_id
= epdrv
->requested_id
;
1224 left
+= early_platform_left(epdrv
, id
);
1226 /* skip requested id */
1227 switch (epdrv
->requested_id
) {
1228 case EARLY_PLATFORM_ID_ERROR
:
1229 case EARLY_PLATFORM_ID_UNSET
:
1232 if (epdrv
->requested_id
== id
)
1233 match_id
= EARLY_PLATFORM_ID_UNSET
;
1238 case EARLY_PLATFORM_ID_ERROR
:
1239 pr_warning("%s: unable to parse %s parameter\n",
1240 class_str
, epdrv
->pdrv
->driver
.name
);
1242 case EARLY_PLATFORM_ID_UNSET
:
1246 match
= early_platform_match(epdrv
, match_id
);
1251 * Set up a sensible init_name to enable
1252 * dev_name() and others to be used before the
1253 * rest of the driver core is initialized.
1255 if (!match
->dev
.init_name
&& slab_is_available()) {
1256 if (match
->id
!= -1)
1257 match
->dev
.init_name
=
1258 kasprintf(GFP_KERNEL
, "%s.%d",
1262 match
->dev
.init_name
=
1263 kasprintf(GFP_KERNEL
, "%s",
1266 if (!match
->dev
.init_name
)
1270 if (epdrv
->pdrv
->probe(match
))
1271 pr_warning("%s: unable to probe %s early.\n",
1272 class_str
, match
->name
);
1288 * early_platform_driver_probe - probe a class of registered drivers
1289 * @class_str: string to identify early platform driver class
1290 * @nr_probe: number of platform devices to successfully probe before exiting
1291 * @user_only: only probe user specified early platform devices
1293 * Used by architecture code to probe registered early platform drivers
1294 * within a certain class. For probe to happen a registered early platform
1295 * device matching a registered early platform driver is needed.
1297 int __init
early_platform_driver_probe(char *class_str
,
1304 for (i
= -2; n
< nr_probe
; i
++) {
1305 k
= early_platform_driver_probe_id(class_str
, i
, nr_probe
- n
);
1320 * early_platform_cleanup - clean up early platform code
1322 void __init
early_platform_cleanup(void)
1324 struct platform_device
*pd
, *pd2
;
1326 /* clean up the devres list used to chain devices */
1327 list_for_each_entry_safe(pd
, pd2
, &early_platform_device_list
,
1329 list_del(&pd
->dev
.devres_head
);
1330 memset(&pd
->dev
.devres_head
, 0, sizeof(pd
->dev
.devres_head
));