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/module.h>
16 #include <linux/init.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/bootmem.h>
19 #include <linux/err.h>
20 #include <linux/slab.h>
21 #include <linux/pm_runtime.h>
25 #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
28 struct device platform_bus
= {
29 .init_name
= "platform",
31 EXPORT_SYMBOL_GPL(platform_bus
);
34 * platform_get_resource - get a resource for a device
35 * @dev: platform device
36 * @type: resource type
37 * @num: resource index
39 struct resource
*platform_get_resource(struct platform_device
*dev
,
40 unsigned int type
, unsigned int num
)
44 for (i
= 0; i
< dev
->num_resources
; i
++) {
45 struct resource
*r
= &dev
->resource
[i
];
47 if (type
== resource_type(r
) && num
-- == 0)
52 EXPORT_SYMBOL_GPL(platform_get_resource
);
55 * platform_get_irq - get an IRQ for a device
56 * @dev: platform device
57 * @num: IRQ number index
59 int platform_get_irq(struct platform_device
*dev
, unsigned int num
)
61 struct resource
*r
= platform_get_resource(dev
, IORESOURCE_IRQ
, num
);
63 return r
? r
->start
: -ENXIO
;
65 EXPORT_SYMBOL_GPL(platform_get_irq
);
68 * platform_get_resource_byname - get a resource for a device by name
69 * @dev: platform device
70 * @type: resource type
71 * @name: resource name
73 struct resource
*platform_get_resource_byname(struct platform_device
*dev
,
79 for (i
= 0; i
< dev
->num_resources
; i
++) {
80 struct resource
*r
= &dev
->resource
[i
];
82 if (type
== resource_type(r
) && !strcmp(r
->name
, name
))
87 EXPORT_SYMBOL_GPL(platform_get_resource_byname
);
90 * platform_get_irq - get an IRQ for a device
91 * @dev: platform device
94 int platform_get_irq_byname(struct platform_device
*dev
, const char *name
)
96 struct resource
*r
= platform_get_resource_byname(dev
, IORESOURCE_IRQ
,
99 return r
? r
->start
: -ENXIO
;
101 EXPORT_SYMBOL_GPL(platform_get_irq_byname
);
104 * platform_add_devices - add a numbers of platform devices
105 * @devs: array of platform devices to add
106 * @num: number of platform devices in array
108 int platform_add_devices(struct platform_device
**devs
, int num
)
112 for (i
= 0; i
< num
; i
++) {
113 ret
= platform_device_register(devs
[i
]);
116 platform_device_unregister(devs
[i
]);
123 EXPORT_SYMBOL_GPL(platform_add_devices
);
125 struct platform_object
{
126 struct platform_device pdev
;
131 * platform_device_put
132 * @pdev: platform device to free
134 * Free all memory associated with a platform device. This function must
135 * _only_ be externally called in error cases. All other usage is a bug.
137 void platform_device_put(struct platform_device
*pdev
)
140 put_device(&pdev
->dev
);
142 EXPORT_SYMBOL_GPL(platform_device_put
);
144 static void platform_device_release(struct device
*dev
)
146 struct platform_object
*pa
= container_of(dev
, struct platform_object
,
149 kfree(pa
->pdev
.dev
.platform_data
);
150 kfree(pa
->pdev
.resource
);
155 * platform_device_alloc
156 * @name: base name of the device we're adding
159 * Create a platform device object which can have other objects attached
160 * to it, and which will have attached objects freed when it is released.
162 struct platform_device
*platform_device_alloc(const char *name
, int id
)
164 struct platform_object
*pa
;
166 pa
= kzalloc(sizeof(struct platform_object
) + strlen(name
), GFP_KERNEL
);
168 strcpy(pa
->name
, name
);
169 pa
->pdev
.name
= pa
->name
;
171 device_initialize(&pa
->pdev
.dev
);
172 pa
->pdev
.dev
.release
= platform_device_release
;
175 return pa
? &pa
->pdev
: NULL
;
177 EXPORT_SYMBOL_GPL(platform_device_alloc
);
180 * platform_device_add_resources
181 * @pdev: platform device allocated by platform_device_alloc to add resources to
182 * @res: set of resources that needs to be allocated for the device
183 * @num: number of resources
185 * Add a copy of the resources to the platform device. The memory
186 * associated with the resources will be freed when the platform device is
189 int platform_device_add_resources(struct platform_device
*pdev
,
190 struct resource
*res
, unsigned int num
)
194 r
= kmalloc(sizeof(struct resource
) * num
, GFP_KERNEL
);
196 memcpy(r
, res
, sizeof(struct resource
) * num
);
198 pdev
->num_resources
= num
;
200 return r
? 0 : -ENOMEM
;
202 EXPORT_SYMBOL_GPL(platform_device_add_resources
);
205 * platform_device_add_data
206 * @pdev: platform device allocated by platform_device_alloc to add resources to
207 * @data: platform specific data for this platform device
208 * @size: size of platform specific data
210 * Add a copy of platform specific data to the platform device's
211 * platform_data pointer. The memory associated with the platform data
212 * will be freed when the platform device is released.
214 int platform_device_add_data(struct platform_device
*pdev
, const void *data
,
217 void *d
= kmemdup(data
, size
, GFP_KERNEL
);
220 pdev
->dev
.platform_data
= d
;
225 EXPORT_SYMBOL_GPL(platform_device_add_data
);
228 * platform_device_add - add a platform device to device hierarchy
229 * @pdev: platform device we're adding
231 * This is part 2 of platform_device_register(), though may be called
232 * separately _iff_ pdev was allocated by platform_device_alloc().
234 int platform_device_add(struct platform_device
*pdev
)
241 if (!pdev
->dev
.parent
)
242 pdev
->dev
.parent
= &platform_bus
;
244 pdev
->dev
.bus
= &platform_bus_type
;
247 dev_set_name(&pdev
->dev
, "%s.%d", pdev
->name
, pdev
->id
);
249 dev_set_name(&pdev
->dev
, "%s", pdev
->name
);
251 for (i
= 0; i
< pdev
->num_resources
; i
++) {
252 struct resource
*p
, *r
= &pdev
->resource
[i
];
255 r
->name
= dev_name(&pdev
->dev
);
259 if (resource_type(r
) == IORESOURCE_MEM
)
261 else if (resource_type(r
) == IORESOURCE_IO
)
262 p
= &ioport_resource
;
265 if (p
&& insert_resource(p
, r
)) {
267 "%s: failed to claim resource %d\n",
268 dev_name(&pdev
->dev
), i
);
274 pr_debug("Registering platform device '%s'. Parent at %s\n",
275 dev_name(&pdev
->dev
), dev_name(pdev
->dev
.parent
));
277 ret
= device_add(&pdev
->dev
);
283 struct resource
*r
= &pdev
->resource
[i
];
284 unsigned long type
= resource_type(r
);
286 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
292 EXPORT_SYMBOL_GPL(platform_device_add
);
295 * platform_device_del - remove a platform-level device
296 * @pdev: platform device we're removing
298 * Note that this function will also release all memory- and port-based
299 * resources owned by the device (@dev->resource). This function must
300 * _only_ be externally called in error cases. All other usage is a bug.
302 void platform_device_del(struct platform_device
*pdev
)
307 device_del(&pdev
->dev
);
309 for (i
= 0; i
< pdev
->num_resources
; i
++) {
310 struct resource
*r
= &pdev
->resource
[i
];
311 unsigned long type
= resource_type(r
);
313 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
318 EXPORT_SYMBOL_GPL(platform_device_del
);
321 * platform_device_register - add a platform-level device
322 * @pdev: platform device we're adding
324 int platform_device_register(struct platform_device
*pdev
)
326 device_initialize(&pdev
->dev
);
327 return platform_device_add(pdev
);
329 EXPORT_SYMBOL_GPL(platform_device_register
);
332 * platform_device_unregister - unregister a platform-level device
333 * @pdev: platform device we're unregistering
335 * Unregistration is done in 2 steps. First we release all resources
336 * and remove it from the subsystem, then we drop reference count by
337 * calling platform_device_put().
339 void platform_device_unregister(struct platform_device
*pdev
)
341 platform_device_del(pdev
);
342 platform_device_put(pdev
);
344 EXPORT_SYMBOL_GPL(platform_device_unregister
);
347 * platform_device_register_simple
348 * @name: base name of the device we're adding
350 * @res: set of resources that needs to be allocated for the device
351 * @num: number of resources
353 * This function creates a simple platform device that requires minimal
354 * resource and memory management. Canned release function freeing memory
355 * allocated for the device allows drivers using such devices to be
356 * unloaded without waiting for the last reference to the device to be
359 * This interface is primarily intended for use with legacy drivers which
360 * probe hardware directly. Because such drivers create sysfs device nodes
361 * themselves, rather than letting system infrastructure handle such device
362 * enumeration tasks, they don't fully conform to the Linux driver model.
363 * In particular, when such drivers are built as modules, they can't be
366 struct platform_device
*platform_device_register_simple(const char *name
,
368 struct resource
*res
,
371 struct platform_device
*pdev
;
374 pdev
= platform_device_alloc(name
, id
);
381 retval
= platform_device_add_resources(pdev
, res
, num
);
386 retval
= platform_device_add(pdev
);
393 platform_device_put(pdev
);
394 return ERR_PTR(retval
);
396 EXPORT_SYMBOL_GPL(platform_device_register_simple
);
399 * platform_device_register_data
400 * @parent: parent device for the device we're adding
401 * @name: base name of the device we're adding
403 * @data: platform specific data for this platform device
404 * @size: size of platform specific data
406 * This function creates a simple platform device that requires minimal
407 * resource and memory management. Canned release function freeing memory
408 * allocated for the device allows drivers using such devices to be
409 * unloaded without waiting for the last reference to the device to be
412 struct platform_device
*platform_device_register_data(
413 struct device
*parent
,
414 const char *name
, int id
,
415 const void *data
, size_t size
)
417 struct platform_device
*pdev
;
420 pdev
= platform_device_alloc(name
, id
);
426 pdev
->dev
.parent
= parent
;
429 retval
= platform_device_add_data(pdev
, data
, size
);
434 retval
= platform_device_add(pdev
);
441 platform_device_put(pdev
);
442 return ERR_PTR(retval
);
444 EXPORT_SYMBOL_GPL(platform_device_register_data
);
446 static int platform_drv_probe(struct device
*_dev
)
448 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
449 struct platform_device
*dev
= to_platform_device(_dev
);
451 return drv
->probe(dev
);
454 static int platform_drv_probe_fail(struct device
*_dev
)
459 static int platform_drv_remove(struct device
*_dev
)
461 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
462 struct platform_device
*dev
= to_platform_device(_dev
);
464 return drv
->remove(dev
);
467 static void platform_drv_shutdown(struct device
*_dev
)
469 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
470 struct platform_device
*dev
= to_platform_device(_dev
);
476 * platform_driver_register
477 * @drv: platform driver structure
479 int platform_driver_register(struct platform_driver
*drv
)
481 drv
->driver
.bus
= &platform_bus_type
;
483 drv
->driver
.probe
= platform_drv_probe
;
485 drv
->driver
.remove
= platform_drv_remove
;
487 drv
->driver
.shutdown
= platform_drv_shutdown
;
489 return driver_register(&drv
->driver
);
491 EXPORT_SYMBOL_GPL(platform_driver_register
);
494 * platform_driver_unregister
495 * @drv: platform driver structure
497 void platform_driver_unregister(struct platform_driver
*drv
)
499 driver_unregister(&drv
->driver
);
501 EXPORT_SYMBOL_GPL(platform_driver_unregister
);
504 * platform_driver_probe - register driver for non-hotpluggable device
505 * @drv: platform driver structure
506 * @probe: the driver probe routine, probably from an __init section
508 * Use this instead of platform_driver_register() when you know the device
509 * is not hotpluggable and has already been registered, and you want to
510 * remove its run-once probe() infrastructure from memory after the driver
511 * has bound to the device.
513 * One typical use for this would be with drivers for controllers integrated
514 * into system-on-chip processors, where the controller devices have been
515 * configured as part of board setup.
517 * Returns zero if the driver registered and bound to a device, else returns
518 * a negative error code and with the driver not registered.
520 int __init_or_module
platform_driver_probe(struct platform_driver
*drv
,
521 int (*probe
)(struct platform_device
*))
525 /* make sure driver won't have bind/unbind attributes */
526 drv
->driver
.suppress_bind_attrs
= true;
528 /* temporary section violation during probe() */
530 retval
= code
= platform_driver_register(drv
);
533 * Fixup that section violation, being paranoid about code scanning
534 * the list of drivers in order to probe new devices. Check to see
535 * if the probe was successful, and make sure any forced probes of
538 spin_lock(&platform_bus_type
.p
->klist_drivers
.k_lock
);
540 if (code
== 0 && list_empty(&drv
->driver
.p
->klist_devices
.k_list
))
542 drv
->driver
.probe
= platform_drv_probe_fail
;
543 spin_unlock(&platform_bus_type
.p
->klist_drivers
.k_lock
);
546 platform_driver_unregister(drv
);
549 EXPORT_SYMBOL_GPL(platform_driver_probe
);
552 * platform_create_bundle - register driver and create corresponding device
553 * @driver: platform driver structure
554 * @probe: the driver probe routine, probably from an __init section
555 * @res: set of resources that needs to be allocated for the device
556 * @n_res: number of resources
557 * @data: platform specific data for this platform device
558 * @size: size of platform specific data
560 * Use this in legacy-style modules that probe hardware directly and
561 * register a single platform device and corresponding platform driver.
563 struct platform_device
* __init_or_module
platform_create_bundle(
564 struct platform_driver
*driver
,
565 int (*probe
)(struct platform_device
*),
566 struct resource
*res
, unsigned int n_res
,
567 const void *data
, size_t size
)
569 struct platform_device
*pdev
;
572 pdev
= platform_device_alloc(driver
->driver
.name
, -1);
579 error
= platform_device_add_resources(pdev
, res
, n_res
);
585 error
= platform_device_add_data(pdev
, data
, size
);
590 error
= platform_device_add(pdev
);
594 error
= platform_driver_probe(driver
, probe
);
601 platform_device_del(pdev
);
603 platform_device_put(pdev
);
605 return ERR_PTR(error
);
607 EXPORT_SYMBOL_GPL(platform_create_bundle
);
609 /* modalias support enables more hands-off userspace setup:
610 * (a) environment variable lets new-style hotplug events work once system is
611 * fully running: "modprobe $MODALIAS"
612 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
613 * mishandled before system is fully running: "modprobe $(cat modalias)"
615 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*a
,
618 struct platform_device
*pdev
= to_platform_device(dev
);
619 int len
= snprintf(buf
, PAGE_SIZE
, "platform:%s\n", pdev
->name
);
621 return (len
>= PAGE_SIZE
) ? (PAGE_SIZE
- 1) : len
;
624 static struct device_attribute platform_dev_attrs
[] = {
629 static int platform_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
631 struct platform_device
*pdev
= to_platform_device(dev
);
633 add_uevent_var(env
, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX
,
634 (pdev
->id_entry
) ? pdev
->id_entry
->name
: pdev
->name
);
638 static const struct platform_device_id
*platform_match_id(
639 struct platform_device_id
*id
,
640 struct platform_device
*pdev
)
642 while (id
->name
[0]) {
643 if (strcmp(pdev
->name
, id
->name
) == 0) {
653 * platform_match - bind platform device to platform driver.
657 * Platform device IDs are assumed to be encoded like this:
658 * "<name><instance>", where <name> is a short description of the type of
659 * device, like "pci" or "floppy", and <instance> is the enumerated
660 * instance of the device, like '0' or '42'. Driver IDs are simply
661 * "<name>". So, extract the <name> from the platform_device structure,
662 * and compare it against the name of the driver. Return whether they match
665 static int platform_match(struct device
*dev
, struct device_driver
*drv
)
667 struct platform_device
*pdev
= to_platform_device(dev
);
668 struct platform_driver
*pdrv
= to_platform_driver(drv
);
670 /* match against the id table first */
672 return platform_match_id(pdrv
->id_table
, pdev
) != NULL
;
674 /* fall-back to driver name match */
675 return (strcmp(pdev
->name
, drv
->name
) == 0);
678 #ifdef CONFIG_PM_SLEEP
680 static int platform_legacy_suspend(struct device
*dev
, pm_message_t mesg
)
682 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
683 struct platform_device
*pdev
= to_platform_device(dev
);
686 if (dev
->driver
&& pdrv
->suspend
)
687 ret
= pdrv
->suspend(pdev
, mesg
);
692 static int platform_legacy_resume(struct device
*dev
)
694 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
695 struct platform_device
*pdev
= to_platform_device(dev
);
698 if (dev
->driver
&& pdrv
->resume
)
699 ret
= pdrv
->resume(pdev
);
704 static int platform_pm_prepare(struct device
*dev
)
706 struct device_driver
*drv
= dev
->driver
;
709 if (drv
&& drv
->pm
&& drv
->pm
->prepare
)
710 ret
= drv
->pm
->prepare(dev
);
715 static void platform_pm_complete(struct device
*dev
)
717 struct device_driver
*drv
= dev
->driver
;
719 if (drv
&& drv
->pm
&& drv
->pm
->complete
)
720 drv
->pm
->complete(dev
);
723 #else /* !CONFIG_PM_SLEEP */
725 #define platform_pm_prepare NULL
726 #define platform_pm_complete NULL
728 #endif /* !CONFIG_PM_SLEEP */
730 #ifdef CONFIG_SUSPEND
732 static int platform_pm_suspend(struct device
*dev
)
734 struct device_driver
*drv
= dev
->driver
;
741 if (drv
->pm
->suspend
)
742 ret
= drv
->pm
->suspend(dev
);
744 ret
= platform_legacy_suspend(dev
, PMSG_SUSPEND
);
750 static int platform_pm_suspend_noirq(struct device
*dev
)
752 struct device_driver
*drv
= dev
->driver
;
759 if (drv
->pm
->suspend_noirq
)
760 ret
= drv
->pm
->suspend_noirq(dev
);
766 static int platform_pm_resume(struct device
*dev
)
768 struct device_driver
*drv
= dev
->driver
;
776 ret
= drv
->pm
->resume(dev
);
778 ret
= platform_legacy_resume(dev
);
784 static int platform_pm_resume_noirq(struct device
*dev
)
786 struct device_driver
*drv
= dev
->driver
;
793 if (drv
->pm
->resume_noirq
)
794 ret
= drv
->pm
->resume_noirq(dev
);
800 #else /* !CONFIG_SUSPEND */
802 #define platform_pm_suspend NULL
803 #define platform_pm_resume NULL
804 #define platform_pm_suspend_noirq NULL
805 #define platform_pm_resume_noirq NULL
807 #endif /* !CONFIG_SUSPEND */
809 #ifdef CONFIG_HIBERNATION
811 static int platform_pm_freeze(struct device
*dev
)
813 struct device_driver
*drv
= dev
->driver
;
821 ret
= drv
->pm
->freeze(dev
);
823 ret
= platform_legacy_suspend(dev
, PMSG_FREEZE
);
829 static int platform_pm_freeze_noirq(struct device
*dev
)
831 struct device_driver
*drv
= dev
->driver
;
838 if (drv
->pm
->freeze_noirq
)
839 ret
= drv
->pm
->freeze_noirq(dev
);
845 static int platform_pm_thaw(struct device
*dev
)
847 struct device_driver
*drv
= dev
->driver
;
855 ret
= drv
->pm
->thaw(dev
);
857 ret
= platform_legacy_resume(dev
);
863 static int platform_pm_thaw_noirq(struct device
*dev
)
865 struct device_driver
*drv
= dev
->driver
;
872 if (drv
->pm
->thaw_noirq
)
873 ret
= drv
->pm
->thaw_noirq(dev
);
879 static int platform_pm_poweroff(struct device
*dev
)
881 struct device_driver
*drv
= dev
->driver
;
888 if (drv
->pm
->poweroff
)
889 ret
= drv
->pm
->poweroff(dev
);
891 ret
= platform_legacy_suspend(dev
, PMSG_HIBERNATE
);
897 static int platform_pm_poweroff_noirq(struct device
*dev
)
899 struct device_driver
*drv
= dev
->driver
;
906 if (drv
->pm
->poweroff_noirq
)
907 ret
= drv
->pm
->poweroff_noirq(dev
);
913 static int platform_pm_restore(struct device
*dev
)
915 struct device_driver
*drv
= dev
->driver
;
922 if (drv
->pm
->restore
)
923 ret
= drv
->pm
->restore(dev
);
925 ret
= platform_legacy_resume(dev
);
931 static int platform_pm_restore_noirq(struct device
*dev
)
933 struct device_driver
*drv
= dev
->driver
;
940 if (drv
->pm
->restore_noirq
)
941 ret
= drv
->pm
->restore_noirq(dev
);
947 #else /* !CONFIG_HIBERNATION */
949 #define platform_pm_freeze NULL
950 #define platform_pm_thaw NULL
951 #define platform_pm_poweroff NULL
952 #define platform_pm_restore NULL
953 #define platform_pm_freeze_noirq NULL
954 #define platform_pm_thaw_noirq NULL
955 #define platform_pm_poweroff_noirq NULL
956 #define platform_pm_restore_noirq NULL
958 #endif /* !CONFIG_HIBERNATION */
960 #ifdef CONFIG_PM_RUNTIME
962 int __weak
platform_pm_runtime_suspend(struct device
*dev
)
967 int __weak
platform_pm_runtime_resume(struct device
*dev
)
972 int __weak
platform_pm_runtime_idle(struct device
*dev
)
977 #else /* !CONFIG_PM_RUNTIME */
979 #define platform_pm_runtime_suspend NULL
980 #define platform_pm_runtime_resume NULL
981 #define platform_pm_runtime_idle NULL
983 #endif /* !CONFIG_PM_RUNTIME */
985 static const struct dev_pm_ops platform_dev_pm_ops
= {
986 .prepare
= platform_pm_prepare
,
987 .complete
= platform_pm_complete
,
988 .suspend
= platform_pm_suspend
,
989 .resume
= platform_pm_resume
,
990 .freeze
= platform_pm_freeze
,
991 .thaw
= platform_pm_thaw
,
992 .poweroff
= platform_pm_poweroff
,
993 .restore
= platform_pm_restore
,
994 .suspend_noirq
= platform_pm_suspend_noirq
,
995 .resume_noirq
= platform_pm_resume_noirq
,
996 .freeze_noirq
= platform_pm_freeze_noirq
,
997 .thaw_noirq
= platform_pm_thaw_noirq
,
998 .poweroff_noirq
= platform_pm_poweroff_noirq
,
999 .restore_noirq
= platform_pm_restore_noirq
,
1000 .runtime_suspend
= platform_pm_runtime_suspend
,
1001 .runtime_resume
= platform_pm_runtime_resume
,
1002 .runtime_idle
= platform_pm_runtime_idle
,
1005 struct bus_type platform_bus_type
= {
1007 .dev_attrs
= platform_dev_attrs
,
1008 .match
= platform_match
,
1009 .uevent
= platform_uevent
,
1010 .pm
= &platform_dev_pm_ops
,
1012 EXPORT_SYMBOL_GPL(platform_bus_type
);
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
1056 * @epdrv: early_platform driver structure
1057 * @buf: string passed from early_param()
1059 int __init
early_platform_driver_register(struct early_platform_driver
*epdrv
,
1065 /* Simply add the driver to the end of the global list.
1066 * Drivers will by default be put on the list in compiled-in order.
1068 if (!epdrv
->list
.next
) {
1069 INIT_LIST_HEAD(&epdrv
->list
);
1070 list_add_tail(&epdrv
->list
, &early_platform_driver_list
);
1073 /* If the user has specified device then make sure the driver
1074 * gets prioritized. The driver of the last device specified on
1075 * command line will be put first on the list.
1077 n
= strlen(epdrv
->pdrv
->driver
.name
);
1078 if (buf
&& !strncmp(buf
, epdrv
->pdrv
->driver
.name
, n
)) {
1079 list_move(&epdrv
->list
, &early_platform_driver_list
);
1081 /* Allow passing parameters after device name */
1082 if (buf
[n
] == '\0' || buf
[n
] == ',')
1083 epdrv
->requested_id
= -1;
1085 epdrv
->requested_id
= simple_strtoul(&buf
[n
+ 1],
1088 if (buf
[n
] != '.' || (tmp
== &buf
[n
+ 1])) {
1089 epdrv
->requested_id
= EARLY_PLATFORM_ID_ERROR
;
1092 n
+= strcspn(&buf
[n
+ 1], ",") + 1;
1098 if (epdrv
->bufsize
) {
1099 memcpy(epdrv
->buffer
, &buf
[n
],
1100 min_t(int, epdrv
->bufsize
, strlen(&buf
[n
]) + 1));
1101 epdrv
->buffer
[epdrv
->bufsize
- 1] = '\0';
1109 * early_platform_add_devices - add a numbers of early platform devices
1110 * @devs: array of early platform devices to add
1111 * @num: number of early platform devices in array
1113 void __init
early_platform_add_devices(struct platform_device
**devs
, int num
)
1118 /* simply add the devices to list */
1119 for (i
= 0; i
< num
; i
++) {
1120 dev
= &devs
[i
]->dev
;
1122 if (!dev
->devres_head
.next
) {
1123 INIT_LIST_HEAD(&dev
->devres_head
);
1124 list_add_tail(&dev
->devres_head
,
1125 &early_platform_device_list
);
1131 * early_platform_driver_register_all
1132 * @class_str: string to identify early platform driver class
1134 void __init
early_platform_driver_register_all(char *class_str
)
1136 /* The "class_str" parameter may or may not be present on the kernel
1137 * command line. If it is present then there may be more than one
1138 * matching parameter.
1140 * Since we register our early platform drivers using early_param()
1141 * we need to make sure that they also get registered in the case
1142 * when the parameter is missing from the kernel command line.
1144 * We use parse_early_options() to make sure the early_param() gets
1145 * called at least once. The early_param() may be called more than
1146 * once since the name of the preferred device may be specified on
1147 * the kernel command line. early_platform_driver_register() handles
1150 parse_early_options(class_str
);
1154 * early_platform_match
1155 * @epdrv: early platform driver structure
1156 * @id: id to match against
1158 static __init
struct platform_device
*
1159 early_platform_match(struct early_platform_driver
*epdrv
, int id
)
1161 struct platform_device
*pd
;
1163 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1164 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1172 * early_platform_left
1173 * @epdrv: early platform driver structure
1174 * @id: return true if id or above exists
1176 static __init
int early_platform_left(struct early_platform_driver
*epdrv
,
1179 struct platform_device
*pd
;
1181 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1182 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1190 * early_platform_driver_probe_id
1191 * @class_str: string to identify early platform driver class
1192 * @id: id to match against
1193 * @nr_probe: number of platform devices to successfully probe before exiting
1195 static int __init
early_platform_driver_probe_id(char *class_str
,
1199 struct early_platform_driver
*epdrv
;
1200 struct platform_device
*match
;
1205 list_for_each_entry(epdrv
, &early_platform_driver_list
, list
) {
1206 /* only use drivers matching our class_str */
1207 if (strcmp(class_str
, epdrv
->class_str
))
1211 match_id
= epdrv
->requested_id
;
1216 left
+= early_platform_left(epdrv
, id
);
1218 /* skip requested id */
1219 switch (epdrv
->requested_id
) {
1220 case EARLY_PLATFORM_ID_ERROR
:
1221 case EARLY_PLATFORM_ID_UNSET
:
1224 if (epdrv
->requested_id
== id
)
1225 match_id
= EARLY_PLATFORM_ID_UNSET
;
1230 case EARLY_PLATFORM_ID_ERROR
:
1231 pr_warning("%s: unable to parse %s parameter\n",
1232 class_str
, epdrv
->pdrv
->driver
.name
);
1234 case EARLY_PLATFORM_ID_UNSET
:
1238 match
= early_platform_match(epdrv
, match_id
);
1242 if (epdrv
->pdrv
->probe(match
))
1243 pr_warning("%s: unable to probe %s early.\n",
1244 class_str
, match
->name
);
1260 * early_platform_driver_probe
1261 * @class_str: string to identify early platform driver class
1262 * @nr_probe: number of platform devices to successfully probe before exiting
1263 * @user_only: only probe user specified early platform devices
1265 int __init
early_platform_driver_probe(char *class_str
,
1272 for (i
= -2; n
< nr_probe
; i
++) {
1273 k
= early_platform_driver_probe_id(class_str
, i
, nr_probe
- n
);
1288 * early_platform_cleanup - clean up early platform code
1290 void __init
early_platform_cleanup(void)
1292 struct platform_device
*pd
, *pd2
;
1294 /* clean up the devres list used to chain devices */
1295 list_for_each_entry_safe(pd
, pd2
, &early_platform_device_list
,
1297 list_del(&pd
->dev
.devres_head
);
1298 memset(&pd
->dev
.devres_head
, 0, sizeof(pd
->dev
.devres_head
));