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/of_irq.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/bootmem.h>
21 #include <linux/err.h>
22 #include <linux/slab.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/idr.h>
25 #include <linux/acpi.h>
28 #include "power/power.h"
30 /* For automatically allocated device IDs */
31 static DEFINE_IDA(platform_devid_ida
);
33 struct device platform_bus
= {
34 .init_name
= "platform",
36 EXPORT_SYMBOL_GPL(platform_bus
);
39 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
40 * @pdev: platform device
42 * This is called before platform_device_add() such that any pdev_archdata may
43 * be setup before the platform_notifier is called. So if a user needs to
44 * manipulate any relevant information in the pdev_archdata they can do:
46 * platform_device_alloc()
48 * platform_device_add()
50 * And if they don't care they can just call platform_device_register() and
51 * everything will just work out.
53 void __weak
arch_setup_pdev_archdata(struct platform_device
*pdev
)
58 * platform_get_resource - get a resource for a device
59 * @dev: platform device
60 * @type: resource type
61 * @num: resource index
63 struct resource
*platform_get_resource(struct platform_device
*dev
,
64 unsigned int type
, unsigned int num
)
68 for (i
= 0; i
< dev
->num_resources
; i
++) {
69 struct resource
*r
= &dev
->resource
[i
];
71 if (type
== resource_type(r
) && num
-- == 0)
76 EXPORT_SYMBOL_GPL(platform_get_resource
);
79 * platform_get_irq - get an IRQ for a device
80 * @dev: platform device
81 * @num: IRQ number index
83 int platform_get_irq(struct platform_device
*dev
, unsigned int num
)
86 /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
87 if (!dev
|| num
>= dev
->archdata
.num_irqs
)
89 return dev
->archdata
.irqs
[num
];
92 if (IS_ENABLED(CONFIG_OF_IRQ
) && dev
->dev
.of_node
)
93 return of_irq_get(dev
->dev
.of_node
, num
);
95 r
= platform_get_resource(dev
, IORESOURCE_IRQ
, num
);
97 return r
? r
->start
: -ENXIO
;
100 EXPORT_SYMBOL_GPL(platform_get_irq
);
103 * platform_get_resource_byname - get a resource for a device by name
104 * @dev: platform device
105 * @type: resource type
106 * @name: resource name
108 struct resource
*platform_get_resource_byname(struct platform_device
*dev
,
114 for (i
= 0; i
< dev
->num_resources
; i
++) {
115 struct resource
*r
= &dev
->resource
[i
];
117 if (unlikely(!r
->name
))
120 if (type
== resource_type(r
) && !strcmp(r
->name
, name
))
125 EXPORT_SYMBOL_GPL(platform_get_resource_byname
);
128 * platform_get_irq_byname - get an IRQ for a device by name
129 * @dev: platform device
132 int platform_get_irq_byname(struct platform_device
*dev
, const char *name
)
134 struct resource
*r
= platform_get_resource_byname(dev
, IORESOURCE_IRQ
,
137 return r
? r
->start
: -ENXIO
;
139 EXPORT_SYMBOL_GPL(platform_get_irq_byname
);
142 * platform_add_devices - add a numbers of platform devices
143 * @devs: array of platform devices to add
144 * @num: number of platform devices in array
146 int platform_add_devices(struct platform_device
**devs
, int num
)
150 for (i
= 0; i
< num
; i
++) {
151 ret
= platform_device_register(devs
[i
]);
154 platform_device_unregister(devs
[i
]);
161 EXPORT_SYMBOL_GPL(platform_add_devices
);
163 struct platform_object
{
164 struct platform_device pdev
;
169 * platform_device_put - destroy a platform device
170 * @pdev: platform device to free
172 * Free all memory associated with a platform device. This function must
173 * _only_ be externally called in error cases. All other usage is a bug.
175 void platform_device_put(struct platform_device
*pdev
)
178 put_device(&pdev
->dev
);
180 EXPORT_SYMBOL_GPL(platform_device_put
);
182 static void platform_device_release(struct device
*dev
)
184 struct platform_object
*pa
= container_of(dev
, struct platform_object
,
187 of_device_node_put(&pa
->pdev
.dev
);
188 kfree(pa
->pdev
.dev
.platform_data
);
189 kfree(pa
->pdev
.mfd_cell
);
190 kfree(pa
->pdev
.resource
);
195 * platform_device_alloc - create a platform device
196 * @name: base name of the device we're adding
199 * Create a platform device object which can have other objects attached
200 * to it, and which will have attached objects freed when it is released.
202 struct platform_device
*platform_device_alloc(const char *name
, int id
)
204 struct platform_object
*pa
;
206 pa
= kzalloc(sizeof(struct platform_object
) + strlen(name
), GFP_KERNEL
);
208 strcpy(pa
->name
, name
);
209 pa
->pdev
.name
= pa
->name
;
211 device_initialize(&pa
->pdev
.dev
);
212 pa
->pdev
.dev
.release
= platform_device_release
;
213 arch_setup_pdev_archdata(&pa
->pdev
);
216 return pa
? &pa
->pdev
: NULL
;
218 EXPORT_SYMBOL_GPL(platform_device_alloc
);
221 * platform_device_add_resources - add resources to a platform device
222 * @pdev: platform device allocated by platform_device_alloc to add resources to
223 * @res: set of resources that needs to be allocated for the device
224 * @num: number of resources
226 * Add a copy of the resources to the platform device. The memory
227 * associated with the resources will be freed when the platform device is
230 int platform_device_add_resources(struct platform_device
*pdev
,
231 const struct resource
*res
, unsigned int num
)
233 struct resource
*r
= NULL
;
236 r
= kmemdup(res
, sizeof(struct resource
) * num
, GFP_KERNEL
);
241 kfree(pdev
->resource
);
243 pdev
->num_resources
= num
;
246 EXPORT_SYMBOL_GPL(platform_device_add_resources
);
249 * platform_device_add_data - add platform-specific data to a platform device
250 * @pdev: platform device allocated by platform_device_alloc to add resources to
251 * @data: platform specific data for this platform device
252 * @size: size of platform specific data
254 * Add a copy of platform specific data to the platform device's
255 * platform_data pointer. The memory associated with the platform data
256 * will be freed when the platform device is released.
258 int platform_device_add_data(struct platform_device
*pdev
, const void *data
,
264 d
= kmemdup(data
, size
, GFP_KERNEL
);
269 kfree(pdev
->dev
.platform_data
);
270 pdev
->dev
.platform_data
= d
;
273 EXPORT_SYMBOL_GPL(platform_device_add_data
);
276 * platform_device_add - add a platform device to device hierarchy
277 * @pdev: platform device we're adding
279 * This is part 2 of platform_device_register(), though may be called
280 * separately _iff_ pdev was allocated by platform_device_alloc().
282 int platform_device_add(struct platform_device
*pdev
)
289 if (!pdev
->dev
.parent
)
290 pdev
->dev
.parent
= &platform_bus
;
292 pdev
->dev
.bus
= &platform_bus_type
;
296 dev_set_name(&pdev
->dev
, "%s.%d", pdev
->name
, pdev
->id
);
298 case PLATFORM_DEVID_NONE
:
299 dev_set_name(&pdev
->dev
, "%s", pdev
->name
);
301 case PLATFORM_DEVID_AUTO
:
303 * Automatically allocated device ID. We mark it as such so
304 * that we remember it must be freed, and we append a suffix
305 * to avoid namespace collision with explicit IDs.
307 ret
= ida_simple_get(&platform_devid_ida
, 0, 0, GFP_KERNEL
);
311 pdev
->id_auto
= true;
312 dev_set_name(&pdev
->dev
, "%s.%d.auto", pdev
->name
, pdev
->id
);
316 for (i
= 0; i
< pdev
->num_resources
; i
++) {
317 struct resource
*p
, *r
= &pdev
->resource
[i
];
320 r
->name
= dev_name(&pdev
->dev
);
324 if (resource_type(r
) == IORESOURCE_MEM
)
326 else if (resource_type(r
) == IORESOURCE_IO
)
327 p
= &ioport_resource
;
330 if (p
&& insert_resource(p
, r
)) {
331 dev_err(&pdev
->dev
, "failed to claim resource %d\n", i
);
337 pr_debug("Registering platform device '%s'. Parent at %s\n",
338 dev_name(&pdev
->dev
), dev_name(pdev
->dev
.parent
));
340 ret
= device_add(&pdev
->dev
);
346 ida_simple_remove(&platform_devid_ida
, pdev
->id
);
347 pdev
->id
= PLATFORM_DEVID_AUTO
;
351 struct resource
*r
= &pdev
->resource
[i
];
352 unsigned long type
= resource_type(r
);
354 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
361 EXPORT_SYMBOL_GPL(platform_device_add
);
364 * platform_device_del - remove a platform-level device
365 * @pdev: platform device we're removing
367 * Note that this function will also release all memory- and port-based
368 * resources owned by the device (@dev->resource). This function must
369 * _only_ be externally called in error cases. All other usage is a bug.
371 void platform_device_del(struct platform_device
*pdev
)
376 device_del(&pdev
->dev
);
379 ida_simple_remove(&platform_devid_ida
, pdev
->id
);
380 pdev
->id
= PLATFORM_DEVID_AUTO
;
383 for (i
= 0; i
< pdev
->num_resources
; i
++) {
384 struct resource
*r
= &pdev
->resource
[i
];
385 unsigned long type
= resource_type(r
);
387 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
392 EXPORT_SYMBOL_GPL(platform_device_del
);
395 * platform_device_register - add a platform-level device
396 * @pdev: platform device we're adding
398 int platform_device_register(struct platform_device
*pdev
)
400 device_initialize(&pdev
->dev
);
401 arch_setup_pdev_archdata(pdev
);
402 return platform_device_add(pdev
);
404 EXPORT_SYMBOL_GPL(platform_device_register
);
407 * platform_device_unregister - unregister a platform-level device
408 * @pdev: platform device we're unregistering
410 * Unregistration is done in 2 steps. First we release all resources
411 * and remove it from the subsystem, then we drop reference count by
412 * calling platform_device_put().
414 void platform_device_unregister(struct platform_device
*pdev
)
416 platform_device_del(pdev
);
417 platform_device_put(pdev
);
419 EXPORT_SYMBOL_GPL(platform_device_unregister
);
422 * platform_device_register_full - add a platform-level device with
423 * resources and platform-specific data
425 * @pdevinfo: data used to create device
427 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
429 struct platform_device
*platform_device_register_full(
430 const struct platform_device_info
*pdevinfo
)
433 struct platform_device
*pdev
;
435 pdev
= platform_device_alloc(pdevinfo
->name
, pdevinfo
->id
);
439 pdev
->dev
.parent
= pdevinfo
->parent
;
440 ACPI_COMPANION_SET(&pdev
->dev
, pdevinfo
->acpi_node
.companion
);
442 if (pdevinfo
->dma_mask
) {
444 * This memory isn't freed when the device is put,
445 * I don't have a nice idea for that though. Conceptually
446 * dma_mask in struct device should not be a pointer.
447 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
450 kmalloc(sizeof(*pdev
->dev
.dma_mask
), GFP_KERNEL
);
451 if (!pdev
->dev
.dma_mask
)
454 *pdev
->dev
.dma_mask
= pdevinfo
->dma_mask
;
455 pdev
->dev
.coherent_dma_mask
= pdevinfo
->dma_mask
;
458 ret
= platform_device_add_resources(pdev
,
459 pdevinfo
->res
, pdevinfo
->num_res
);
463 ret
= platform_device_add_data(pdev
,
464 pdevinfo
->data
, pdevinfo
->size_data
);
468 ret
= platform_device_add(pdev
);
471 ACPI_COMPANION_SET(&pdev
->dev
, NULL
);
472 kfree(pdev
->dev
.dma_mask
);
475 platform_device_put(pdev
);
481 EXPORT_SYMBOL_GPL(platform_device_register_full
);
483 static int platform_drv_probe(struct device
*_dev
)
485 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
486 struct platform_device
*dev
= to_platform_device(_dev
);
489 acpi_dev_pm_attach(_dev
, true);
491 ret
= drv
->probe(dev
);
493 acpi_dev_pm_detach(_dev
, true);
495 if (drv
->prevent_deferred_probe
&& ret
== -EPROBE_DEFER
) {
496 dev_warn(_dev
, "probe deferral not supported\n");
503 static int platform_drv_probe_fail(struct device
*_dev
)
508 static int platform_drv_remove(struct device
*_dev
)
510 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
511 struct platform_device
*dev
= to_platform_device(_dev
);
514 ret
= drv
->remove(dev
);
515 acpi_dev_pm_detach(_dev
, true);
520 static void platform_drv_shutdown(struct device
*_dev
)
522 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
523 struct platform_device
*dev
= to_platform_device(_dev
);
526 acpi_dev_pm_detach(_dev
, true);
530 * __platform_driver_register - register a driver for platform-level devices
531 * @drv: platform driver structure
532 * @owner: owning module/driver
534 int __platform_driver_register(struct platform_driver
*drv
,
535 struct module
*owner
)
537 drv
->driver
.owner
= owner
;
538 drv
->driver
.bus
= &platform_bus_type
;
540 drv
->driver
.probe
= platform_drv_probe
;
542 drv
->driver
.remove
= platform_drv_remove
;
544 drv
->driver
.shutdown
= platform_drv_shutdown
;
546 return driver_register(&drv
->driver
);
548 EXPORT_SYMBOL_GPL(__platform_driver_register
);
551 * platform_driver_unregister - unregister a driver for platform-level devices
552 * @drv: platform driver structure
554 void platform_driver_unregister(struct platform_driver
*drv
)
556 driver_unregister(&drv
->driver
);
558 EXPORT_SYMBOL_GPL(platform_driver_unregister
);
561 * platform_driver_probe - register driver for non-hotpluggable device
562 * @drv: platform driver structure
563 * @probe: the driver probe routine, probably from an __init section
565 * Use this instead of platform_driver_register() when you know the device
566 * is not hotpluggable and has already been registered, and you want to
567 * remove its run-once probe() infrastructure from memory after the driver
568 * has bound to the device.
570 * One typical use for this would be with drivers for controllers integrated
571 * into system-on-chip processors, where the controller devices have been
572 * configured as part of board setup.
574 * Note that this is incompatible with deferred probing.
576 * Returns zero if the driver registered and bound to a device, else returns
577 * a negative error code and with the driver not registered.
579 int __init_or_module
platform_driver_probe(struct platform_driver
*drv
,
580 int (*probe
)(struct platform_device
*))
585 * Prevent driver from requesting probe deferral to avoid further
586 * futile probe attempts.
588 drv
->prevent_deferred_probe
= true;
590 /* make sure driver won't have bind/unbind attributes */
591 drv
->driver
.suppress_bind_attrs
= true;
593 /* temporary section violation during probe() */
595 retval
= code
= platform_driver_register(drv
);
598 * Fixup that section violation, being paranoid about code scanning
599 * the list of drivers in order to probe new devices. Check to see
600 * if the probe was successful, and make sure any forced probes of
603 spin_lock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
605 if (code
== 0 && list_empty(&drv
->driver
.p
->klist_devices
.k_list
))
607 drv
->driver
.probe
= platform_drv_probe_fail
;
608 spin_unlock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
611 platform_driver_unregister(drv
);
614 EXPORT_SYMBOL_GPL(platform_driver_probe
);
617 * platform_create_bundle - register driver and create corresponding device
618 * @driver: platform driver structure
619 * @probe: the driver probe routine, probably from an __init section
620 * @res: set of resources that needs to be allocated for the device
621 * @n_res: number of resources
622 * @data: platform specific data for this platform device
623 * @size: size of platform specific data
625 * Use this in legacy-style modules that probe hardware directly and
626 * register a single platform device and corresponding platform driver.
628 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
630 struct platform_device
* __init_or_module
platform_create_bundle(
631 struct platform_driver
*driver
,
632 int (*probe
)(struct platform_device
*),
633 struct resource
*res
, unsigned int n_res
,
634 const void *data
, size_t size
)
636 struct platform_device
*pdev
;
639 pdev
= platform_device_alloc(driver
->driver
.name
, -1);
645 error
= platform_device_add_resources(pdev
, res
, n_res
);
649 error
= platform_device_add_data(pdev
, data
, size
);
653 error
= platform_device_add(pdev
);
657 error
= platform_driver_probe(driver
, probe
);
664 platform_device_del(pdev
);
666 platform_device_put(pdev
);
668 return ERR_PTR(error
);
670 EXPORT_SYMBOL_GPL(platform_create_bundle
);
672 /* modalias support enables more hands-off userspace setup:
673 * (a) environment variable lets new-style hotplug events work once system is
674 * fully running: "modprobe $MODALIAS"
675 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
676 * mishandled before system is fully running: "modprobe $(cat modalias)"
678 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*a
,
681 struct platform_device
*pdev
= to_platform_device(dev
);
684 len
= of_device_get_modalias(dev
, buf
, PAGE_SIZE
-1);
688 len
= acpi_device_modalias(dev
, buf
, PAGE_SIZE
-1);
692 len
= snprintf(buf
, PAGE_SIZE
, "platform:%s\n", pdev
->name
);
694 return (len
>= PAGE_SIZE
) ? (PAGE_SIZE
- 1) : len
;
696 static DEVICE_ATTR_RO(modalias
);
698 static struct attribute
*platform_dev_attrs
[] = {
699 &dev_attr_modalias
.attr
,
702 ATTRIBUTE_GROUPS(platform_dev
);
704 static int platform_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
706 struct platform_device
*pdev
= to_platform_device(dev
);
709 /* Some devices have extra OF data and an OF-style MODALIAS */
710 rc
= of_device_uevent_modalias(dev
, env
);
714 rc
= acpi_device_uevent_modalias(dev
, env
);
718 add_uevent_var(env
, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX
,
723 static const struct platform_device_id
*platform_match_id(
724 const struct platform_device_id
*id
,
725 struct platform_device
*pdev
)
727 while (id
->name
[0]) {
728 if (strcmp(pdev
->name
, id
->name
) == 0) {
738 * platform_match - bind platform device to platform driver.
742 * Platform device IDs are assumed to be encoded like this:
743 * "<name><instance>", where <name> is a short description of the type of
744 * device, like "pci" or "floppy", and <instance> is the enumerated
745 * instance of the device, like '0' or '42'. Driver IDs are simply
746 * "<name>". So, extract the <name> from the platform_device structure,
747 * and compare it against the name of the driver. Return whether they match
750 static int platform_match(struct device
*dev
, struct device_driver
*drv
)
752 struct platform_device
*pdev
= to_platform_device(dev
);
753 struct platform_driver
*pdrv
= to_platform_driver(drv
);
755 /* Attempt an OF style match first */
756 if (of_driver_match_device(dev
, drv
))
759 /* Then try ACPI style match */
760 if (acpi_driver_match_device(dev
, drv
))
763 /* Then try to match against the id table */
765 return platform_match_id(pdrv
->id_table
, pdev
) != NULL
;
767 /* fall-back to driver name match */
768 return (strcmp(pdev
->name
, drv
->name
) == 0);
771 #ifdef CONFIG_PM_SLEEP
773 static int platform_legacy_suspend(struct device
*dev
, pm_message_t mesg
)
775 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
776 struct platform_device
*pdev
= to_platform_device(dev
);
779 if (dev
->driver
&& pdrv
->suspend
)
780 ret
= pdrv
->suspend(pdev
, mesg
);
785 static int platform_legacy_resume(struct device
*dev
)
787 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
788 struct platform_device
*pdev
= to_platform_device(dev
);
791 if (dev
->driver
&& pdrv
->resume
)
792 ret
= pdrv
->resume(pdev
);
797 #endif /* CONFIG_PM_SLEEP */
799 #ifdef CONFIG_SUSPEND
801 int platform_pm_suspend(struct device
*dev
)
803 struct device_driver
*drv
= dev
->driver
;
810 if (drv
->pm
->suspend
)
811 ret
= drv
->pm
->suspend(dev
);
813 ret
= platform_legacy_suspend(dev
, PMSG_SUSPEND
);
819 int platform_pm_resume(struct device
*dev
)
821 struct device_driver
*drv
= dev
->driver
;
829 ret
= drv
->pm
->resume(dev
);
831 ret
= platform_legacy_resume(dev
);
837 #endif /* CONFIG_SUSPEND */
839 #ifdef CONFIG_HIBERNATE_CALLBACKS
841 int platform_pm_freeze(struct device
*dev
)
843 struct device_driver
*drv
= dev
->driver
;
851 ret
= drv
->pm
->freeze(dev
);
853 ret
= platform_legacy_suspend(dev
, PMSG_FREEZE
);
859 int platform_pm_thaw(struct device
*dev
)
861 struct device_driver
*drv
= dev
->driver
;
869 ret
= drv
->pm
->thaw(dev
);
871 ret
= platform_legacy_resume(dev
);
877 int platform_pm_poweroff(struct device
*dev
)
879 struct device_driver
*drv
= dev
->driver
;
886 if (drv
->pm
->poweroff
)
887 ret
= drv
->pm
->poweroff(dev
);
889 ret
= platform_legacy_suspend(dev
, PMSG_HIBERNATE
);
895 int platform_pm_restore(struct device
*dev
)
897 struct device_driver
*drv
= dev
->driver
;
904 if (drv
->pm
->restore
)
905 ret
= drv
->pm
->restore(dev
);
907 ret
= platform_legacy_resume(dev
);
913 #endif /* CONFIG_HIBERNATE_CALLBACKS */
915 static const struct dev_pm_ops platform_dev_pm_ops
= {
916 .runtime_suspend
= pm_generic_runtime_suspend
,
917 .runtime_resume
= pm_generic_runtime_resume
,
918 USE_PLATFORM_PM_SLEEP_OPS
921 struct bus_type platform_bus_type
= {
923 .dev_groups
= platform_dev_groups
,
924 .match
= platform_match
,
925 .uevent
= platform_uevent
,
926 .pm
= &platform_dev_pm_ops
,
928 EXPORT_SYMBOL_GPL(platform_bus_type
);
930 int __init
platform_bus_init(void)
934 early_platform_cleanup();
936 error
= device_register(&platform_bus
);
939 error
= bus_register(&platform_bus_type
);
941 device_unregister(&platform_bus
);
945 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
946 u64
dma_get_required_mask(struct device
*dev
)
948 u32 low_totalram
= ((max_pfn
- 1) << PAGE_SHIFT
);
949 u32 high_totalram
= ((max_pfn
- 1) >> (32 - PAGE_SHIFT
));
952 if (!high_totalram
) {
953 /* convert to mask just covering totalram */
954 low_totalram
= (1 << (fls(low_totalram
) - 1));
955 low_totalram
+= low_totalram
- 1;
958 high_totalram
= (1 << (fls(high_totalram
) - 1));
959 high_totalram
+= high_totalram
- 1;
960 mask
= (((u64
)high_totalram
) << 32) + 0xffffffff;
964 EXPORT_SYMBOL_GPL(dma_get_required_mask
);
967 static __initdata
LIST_HEAD(early_platform_driver_list
);
968 static __initdata
LIST_HEAD(early_platform_device_list
);
971 * early_platform_driver_register - register early platform driver
972 * @epdrv: early_platform driver structure
973 * @buf: string passed from early_param()
975 * Helper function for early_platform_init() / early_platform_init_buffer()
977 int __init
early_platform_driver_register(struct early_platform_driver
*epdrv
,
983 /* Simply add the driver to the end of the global list.
984 * Drivers will by default be put on the list in compiled-in order.
986 if (!epdrv
->list
.next
) {
987 INIT_LIST_HEAD(&epdrv
->list
);
988 list_add_tail(&epdrv
->list
, &early_platform_driver_list
);
991 /* If the user has specified device then make sure the driver
992 * gets prioritized. The driver of the last device specified on
993 * command line will be put first on the list.
995 n
= strlen(epdrv
->pdrv
->driver
.name
);
996 if (buf
&& !strncmp(buf
, epdrv
->pdrv
->driver
.name
, n
)) {
997 list_move(&epdrv
->list
, &early_platform_driver_list
);
999 /* Allow passing parameters after device name */
1000 if (buf
[n
] == '\0' || buf
[n
] == ',')
1001 epdrv
->requested_id
= -1;
1003 epdrv
->requested_id
= simple_strtoul(&buf
[n
+ 1],
1006 if (buf
[n
] != '.' || (tmp
== &buf
[n
+ 1])) {
1007 epdrv
->requested_id
= EARLY_PLATFORM_ID_ERROR
;
1010 n
+= strcspn(&buf
[n
+ 1], ",") + 1;
1016 if (epdrv
->bufsize
) {
1017 memcpy(epdrv
->buffer
, &buf
[n
],
1018 min_t(int, epdrv
->bufsize
, strlen(&buf
[n
]) + 1));
1019 epdrv
->buffer
[epdrv
->bufsize
- 1] = '\0';
1027 * early_platform_add_devices - adds a number of early platform devices
1028 * @devs: array of early platform devices to add
1029 * @num: number of early platform devices in array
1031 * Used by early architecture code to register early platform devices and
1032 * their platform data.
1034 void __init
early_platform_add_devices(struct platform_device
**devs
, int num
)
1039 /* simply add the devices to list */
1040 for (i
= 0; i
< num
; i
++) {
1041 dev
= &devs
[i
]->dev
;
1043 if (!dev
->devres_head
.next
) {
1044 pm_runtime_early_init(dev
);
1045 INIT_LIST_HEAD(&dev
->devres_head
);
1046 list_add_tail(&dev
->devres_head
,
1047 &early_platform_device_list
);
1053 * early_platform_driver_register_all - register early platform drivers
1054 * @class_str: string to identify early platform driver class
1056 * Used by architecture code to register all early platform drivers
1057 * for a certain class. If omitted then only early platform drivers
1058 * with matching kernel command line class parameters will be registered.
1060 void __init
early_platform_driver_register_all(char *class_str
)
1062 /* The "class_str" parameter may or may not be present on the kernel
1063 * command line. If it is present then there may be more than one
1064 * matching parameter.
1066 * Since we register our early platform drivers using early_param()
1067 * we need to make sure that they also get registered in the case
1068 * when the parameter is missing from the kernel command line.
1070 * We use parse_early_options() to make sure the early_param() gets
1071 * called at least once. The early_param() may be called more than
1072 * once since the name of the preferred device may be specified on
1073 * the kernel command line. early_platform_driver_register() handles
1076 parse_early_options(class_str
);
1080 * early_platform_match - find early platform device matching driver
1081 * @epdrv: early platform driver structure
1082 * @id: id to match against
1084 static struct platform_device
* __init
1085 early_platform_match(struct early_platform_driver
*epdrv
, int id
)
1087 struct platform_device
*pd
;
1089 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1090 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1098 * early_platform_left - check if early platform driver has matching devices
1099 * @epdrv: early platform driver structure
1100 * @id: return true if id or above exists
1102 static int __init
early_platform_left(struct early_platform_driver
*epdrv
,
1105 struct platform_device
*pd
;
1107 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1108 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1116 * early_platform_driver_probe_id - probe drivers matching class_str and id
1117 * @class_str: string to identify early platform driver class
1118 * @id: id to match against
1119 * @nr_probe: number of platform devices to successfully probe before exiting
1121 static int __init
early_platform_driver_probe_id(char *class_str
,
1125 struct early_platform_driver
*epdrv
;
1126 struct platform_device
*match
;
1131 list_for_each_entry(epdrv
, &early_platform_driver_list
, list
) {
1132 /* only use drivers matching our class_str */
1133 if (strcmp(class_str
, epdrv
->class_str
))
1137 match_id
= epdrv
->requested_id
;
1142 left
+= early_platform_left(epdrv
, id
);
1144 /* skip requested id */
1145 switch (epdrv
->requested_id
) {
1146 case EARLY_PLATFORM_ID_ERROR
:
1147 case EARLY_PLATFORM_ID_UNSET
:
1150 if (epdrv
->requested_id
== id
)
1151 match_id
= EARLY_PLATFORM_ID_UNSET
;
1156 case EARLY_PLATFORM_ID_ERROR
:
1157 pr_warn("%s: unable to parse %s parameter\n",
1158 class_str
, epdrv
->pdrv
->driver
.name
);
1160 case EARLY_PLATFORM_ID_UNSET
:
1164 match
= early_platform_match(epdrv
, match_id
);
1169 * Set up a sensible init_name to enable
1170 * dev_name() and others to be used before the
1171 * rest of the driver core is initialized.
1173 if (!match
->dev
.init_name
&& slab_is_available()) {
1174 if (match
->id
!= -1)
1175 match
->dev
.init_name
=
1176 kasprintf(GFP_KERNEL
, "%s.%d",
1180 match
->dev
.init_name
=
1181 kasprintf(GFP_KERNEL
, "%s",
1184 if (!match
->dev
.init_name
)
1188 if (epdrv
->pdrv
->probe(match
))
1189 pr_warn("%s: unable to probe %s early.\n",
1190 class_str
, match
->name
);
1206 * early_platform_driver_probe - probe a class of registered drivers
1207 * @class_str: string to identify early platform driver class
1208 * @nr_probe: number of platform devices to successfully probe before exiting
1209 * @user_only: only probe user specified early platform devices
1211 * Used by architecture code to probe registered early platform drivers
1212 * within a certain class. For probe to happen a registered early platform
1213 * device matching a registered early platform driver is needed.
1215 int __init
early_platform_driver_probe(char *class_str
,
1222 for (i
= -2; n
< nr_probe
; i
++) {
1223 k
= early_platform_driver_probe_id(class_str
, i
, nr_probe
- n
);
1238 * early_platform_cleanup - clean up early platform code
1240 void __init
early_platform_cleanup(void)
1242 struct platform_device
*pd
, *pd2
;
1244 /* clean up the devres list used to chain devices */
1245 list_for_each_entry_safe(pd
, pd2
, &early_platform_device_list
,
1247 list_del(&pd
->dev
.devres_head
);
1248 memset(&pd
->dev
.devres_head
, 0, sizeof(pd
->dev
.devres_head
));