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/pm_domain.h>
25 #include <linux/idr.h>
26 #include <linux/acpi.h>
27 #include <linux/clk/clk-conf.h>
28 #include <linux/limits.h>
31 #include "power/power.h"
33 /* For automatically allocated device IDs */
34 static DEFINE_IDA(platform_devid_ida);
36 struct device platform_bus = {
37 .init_name = "platform",
39 EXPORT_SYMBOL_GPL(platform_bus);
42 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
43 * @pdev: platform device
45 * This is called before platform_device_add() such that any pdev_archdata may
46 * be setup before the platform_notifier is called. So if a user needs to
47 * manipulate any relevant information in the pdev_archdata they can do:
49 * platform_device_alloc()
51 * platform_device_add()
53 * And if they don't care they can just call platform_device_register() and
54 * everything will just work out.
56 void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
61 * platform_get_resource - get a resource for a device
62 * @dev: platform device
63 * @type: resource type
64 * @num: resource index
66 struct resource *platform_get_resource(struct platform_device *dev,
67 unsigned int type, unsigned int num)
71 for (i = 0; i < dev->num_resources; i++) {
72 struct resource *r = &dev->resource[i];
74 if (type == resource_type(r) && num-- == 0)
79 EXPORT_SYMBOL_GPL(platform_get_resource);
82 * platform_get_irq - get an IRQ for a device
83 * @dev: platform device
84 * @num: IRQ number index
86 int platform_get_irq(struct platform_device *dev, unsigned int num)
89 /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
90 if (!dev || num >= dev->archdata.num_irqs)
92 return dev->archdata.irqs[num];
95 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
98 ret = of_irq_get(dev->dev.of_node, num);
99 if (ret >= 0 || ret == -EPROBE_DEFER)
103 r = platform_get_resource(dev, IORESOURCE_IRQ, num);
105 * The resources may pass trigger flags to the irqs that need
106 * to be set up. It so happens that the trigger flags for
107 * IORESOURCE_BITS correspond 1-to-1 to the IRQF_TRIGGER*
110 if (r && r->flags & IORESOURCE_BITS)
111 irqd_set_trigger_type(irq_get_irq_data(r->start),
112 r->flags & IORESOURCE_BITS);
114 return r ? r->start : -ENXIO;
117 EXPORT_SYMBOL_GPL(platform_get_irq);
120 * platform_get_resource_byname - get a resource for a device by name
121 * @dev: platform device
122 * @type: resource type
123 * @name: resource name
125 struct resource *platform_get_resource_byname(struct platform_device *dev,
131 for (i = 0; i < dev->num_resources; i++) {
132 struct resource *r = &dev->resource[i];
134 if (unlikely(!r->name))
137 if (type == resource_type(r) && !strcmp(r->name, name))
142 EXPORT_SYMBOL_GPL(platform_get_resource_byname);
145 * platform_get_irq_byname - get an IRQ for a device by name
146 * @dev: platform device
149 int platform_get_irq_byname(struct platform_device *dev, const char *name)
153 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
156 ret = of_irq_get_byname(dev->dev.of_node, name);
157 if (ret >= 0 || ret == -EPROBE_DEFER)
161 r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
162 return r ? r->start : -ENXIO;
164 EXPORT_SYMBOL_GPL(platform_get_irq_byname);
167 * platform_add_devices - add a numbers of platform devices
168 * @devs: array of platform devices to add
169 * @num: number of platform devices in array
171 int platform_add_devices(struct platform_device **devs, int num)
175 for (i = 0; i < num; i++) {
176 ret = platform_device_register(devs[i]);
179 platform_device_unregister(devs[i]);
186 EXPORT_SYMBOL_GPL(platform_add_devices);
188 struct platform_object {
189 struct platform_device pdev;
194 * platform_device_put - destroy a platform device
195 * @pdev: platform device to free
197 * Free all memory associated with a platform device. This function must
198 * _only_ be externally called in error cases. All other usage is a bug.
200 void platform_device_put(struct platform_device *pdev)
203 put_device(&pdev->dev);
205 EXPORT_SYMBOL_GPL(platform_device_put);
207 static void platform_device_release(struct device *dev)
209 struct platform_object *pa = container_of(dev, struct platform_object,
212 of_device_node_put(&pa->pdev.dev);
213 kfree(pa->pdev.dev.platform_data);
214 kfree(pa->pdev.mfd_cell);
215 kfree(pa->pdev.resource);
216 kfree(pa->pdev.driver_override);
221 * platform_device_alloc - create a platform device
222 * @name: base name of the device we're adding
225 * Create a platform device object which can have other objects attached
226 * to it, and which will have attached objects freed when it is released.
228 struct platform_device *platform_device_alloc(const char *name, int id)
230 struct platform_object *pa;
232 pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL);
234 strcpy(pa->name, name);
235 pa->pdev.name = pa->name;
237 device_initialize(&pa->pdev.dev);
238 pa->pdev.dev.release = platform_device_release;
239 arch_setup_pdev_archdata(&pa->pdev);
242 return pa ? &pa->pdev : NULL;
244 EXPORT_SYMBOL_GPL(platform_device_alloc);
247 * platform_device_add_resources - add resources to a platform device
248 * @pdev: platform device allocated by platform_device_alloc to add resources to
249 * @res: set of resources that needs to be allocated for the device
250 * @num: number of resources
252 * Add a copy of the resources to the platform device. The memory
253 * associated with the resources will be freed when the platform device is
256 int platform_device_add_resources(struct platform_device *pdev,
257 const struct resource *res, unsigned int num)
259 struct resource *r = NULL;
262 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
267 kfree(pdev->resource);
269 pdev->num_resources = num;
272 EXPORT_SYMBOL_GPL(platform_device_add_resources);
275 * platform_device_add_data - add platform-specific data to a platform device
276 * @pdev: platform device allocated by platform_device_alloc to add resources to
277 * @data: platform specific data for this platform device
278 * @size: size of platform specific data
280 * Add a copy of platform specific data to the platform device's
281 * platform_data pointer. The memory associated with the platform data
282 * will be freed when the platform device is released.
284 int platform_device_add_data(struct platform_device *pdev, const void *data,
290 d = kmemdup(data, size, GFP_KERNEL);
295 kfree(pdev->dev.platform_data);
296 pdev->dev.platform_data = d;
299 EXPORT_SYMBOL_GPL(platform_device_add_data);
302 * platform_device_add - add a platform device to device hierarchy
303 * @pdev: platform device we're adding
305 * This is part 2 of platform_device_register(), though may be called
306 * separately _iff_ pdev was allocated by platform_device_alloc().
308 int platform_device_add(struct platform_device *pdev)
315 if (!pdev->dev.parent)
316 pdev->dev.parent = &platform_bus;
318 pdev->dev.bus = &platform_bus_type;
322 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
324 case PLATFORM_DEVID_NONE:
325 dev_set_name(&pdev->dev, "%s", pdev->name);
327 case PLATFORM_DEVID_AUTO:
329 * Automatically allocated device ID. We mark it as such so
330 * that we remember it must be freed, and we append a suffix
331 * to avoid namespace collision with explicit IDs.
333 ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL);
337 pdev->id_auto = true;
338 dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
342 for (i = 0; i < pdev->num_resources; i++) {
343 struct resource *p, *r = &pdev->resource[i];
346 r->name = dev_name(&pdev->dev);
350 if (resource_type(r) == IORESOURCE_MEM)
352 else if (resource_type(r) == IORESOURCE_IO)
353 p = &ioport_resource;
356 if (p && insert_resource(p, r)) {
357 dev_err(&pdev->dev, "failed to claim resource %d\n", i);
363 pr_debug("Registering platform device '%s'. Parent at %s\n",
364 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
366 ret = device_add(&pdev->dev);
372 ida_simple_remove(&platform_devid_ida, pdev->id);
373 pdev->id = PLATFORM_DEVID_AUTO;
377 struct resource *r = &pdev->resource[i];
385 EXPORT_SYMBOL_GPL(platform_device_add);
388 * platform_device_del - remove a platform-level device
389 * @pdev: platform device we're removing
391 * Note that this function will also release all memory- and port-based
392 * resources owned by the device (@dev->resource). This function must
393 * _only_ be externally called in error cases. All other usage is a bug.
395 void platform_device_del(struct platform_device *pdev)
400 device_del(&pdev->dev);
403 ida_simple_remove(&platform_devid_ida, pdev->id);
404 pdev->id = PLATFORM_DEVID_AUTO;
407 for (i = 0; i < pdev->num_resources; i++) {
408 struct resource *r = &pdev->resource[i];
414 EXPORT_SYMBOL_GPL(platform_device_del);
417 * platform_device_register - add a platform-level device
418 * @pdev: platform device we're adding
420 int platform_device_register(struct platform_device *pdev)
422 device_initialize(&pdev->dev);
423 arch_setup_pdev_archdata(pdev);
424 return platform_device_add(pdev);
426 EXPORT_SYMBOL_GPL(platform_device_register);
429 * platform_device_unregister - unregister a platform-level device
430 * @pdev: platform device we're unregistering
432 * Unregistration is done in 2 steps. First we release all resources
433 * and remove it from the subsystem, then we drop reference count by
434 * calling platform_device_put().
436 void platform_device_unregister(struct platform_device *pdev)
438 platform_device_del(pdev);
439 platform_device_put(pdev);
441 EXPORT_SYMBOL_GPL(platform_device_unregister);
444 * platform_device_register_full - add a platform-level device with
445 * resources and platform-specific data
447 * @pdevinfo: data used to create device
449 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
451 struct platform_device *platform_device_register_full(
452 const struct platform_device_info *pdevinfo)
455 struct platform_device *pdev;
457 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
461 pdev->dev.parent = pdevinfo->parent;
462 pdev->dev.fwnode = pdevinfo->fwnode;
464 if (pdevinfo->dma_mask) {
466 * This memory isn't freed when the device is put,
467 * I don't have a nice idea for that though. Conceptually
468 * dma_mask in struct device should not be a pointer.
469 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
472 kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
473 if (!pdev->dev.dma_mask)
476 *pdev->dev.dma_mask = pdevinfo->dma_mask;
477 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
480 ret = platform_device_add_resources(pdev,
481 pdevinfo->res, pdevinfo->num_res);
485 ret = platform_device_add_data(pdev,
486 pdevinfo->data, pdevinfo->size_data);
490 ret = platform_device_add(pdev);
493 ACPI_COMPANION_SET(&pdev->dev, NULL);
494 kfree(pdev->dev.dma_mask);
497 platform_device_put(pdev);
503 EXPORT_SYMBOL_GPL(platform_device_register_full);
505 static int platform_drv_probe(struct device *_dev)
507 struct platform_driver *drv = to_platform_driver(_dev->driver);
508 struct platform_device *dev = to_platform_device(_dev);
511 ret = of_clk_set_defaults(_dev->of_node, false);
515 ret = dev_pm_domain_attach(_dev, true);
516 if (ret != -EPROBE_DEFER) {
517 ret = drv->probe(dev);
519 dev_pm_domain_detach(_dev, true);
522 if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) {
523 dev_warn(_dev, "probe deferral not supported\n");
530 static int platform_drv_probe_fail(struct device *_dev)
535 static int platform_drv_remove(struct device *_dev)
537 struct platform_driver *drv = to_platform_driver(_dev->driver);
538 struct platform_device *dev = to_platform_device(_dev);
541 ret = drv->remove(dev);
542 dev_pm_domain_detach(_dev, true);
547 static void platform_drv_shutdown(struct device *_dev)
549 struct platform_driver *drv = to_platform_driver(_dev->driver);
550 struct platform_device *dev = to_platform_device(_dev);
553 dev_pm_domain_detach(_dev, true);
557 * __platform_driver_register - register a driver for platform-level devices
558 * @drv: platform driver structure
559 * @owner: owning module/driver
561 int __platform_driver_register(struct platform_driver *drv,
562 struct module *owner)
564 drv->driver.owner = owner;
565 drv->driver.bus = &platform_bus_type;
567 drv->driver.probe = platform_drv_probe;
569 drv->driver.remove = platform_drv_remove;
571 drv->driver.shutdown = platform_drv_shutdown;
573 return driver_register(&drv->driver);
575 EXPORT_SYMBOL_GPL(__platform_driver_register);
578 * platform_driver_unregister - unregister a driver for platform-level devices
579 * @drv: platform driver structure
581 void platform_driver_unregister(struct platform_driver *drv)
583 driver_unregister(&drv->driver);
585 EXPORT_SYMBOL_GPL(platform_driver_unregister);
588 * __platform_driver_probe - register driver for non-hotpluggable device
589 * @drv: platform driver structure
590 * @probe: the driver probe routine, probably from an __init section
591 * @module: module which will be the owner of the driver
593 * Use this instead of platform_driver_register() when you know the device
594 * is not hotpluggable and has already been registered, and you want to
595 * remove its run-once probe() infrastructure from memory after the driver
596 * has bound to the device.
598 * One typical use for this would be with drivers for controllers integrated
599 * into system-on-chip processors, where the controller devices have been
600 * configured as part of board setup.
602 * Note that this is incompatible with deferred probing.
604 * Returns zero if the driver registered and bound to a device, else returns
605 * a negative error code and with the driver not registered.
607 int __init_or_module __platform_driver_probe(struct platform_driver *drv,
608 int (*probe)(struct platform_device *), struct module *module)
613 * Prevent driver from requesting probe deferral to avoid further
614 * futile probe attempts.
616 drv->prevent_deferred_probe = true;
618 /* make sure driver won't have bind/unbind attributes */
619 drv->driver.suppress_bind_attrs = true;
621 /* temporary section violation during probe() */
623 retval = code = __platform_driver_register(drv, module);
626 * Fixup that section violation, being paranoid about code scanning
627 * the list of drivers in order to probe new devices. Check to see
628 * if the probe was successful, and make sure any forced probes of
631 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
633 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
635 drv->driver.probe = platform_drv_probe_fail;
636 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
639 platform_driver_unregister(drv);
642 EXPORT_SYMBOL_GPL(__platform_driver_probe);
645 * __platform_create_bundle - register driver and create corresponding device
646 * @driver: platform driver structure
647 * @probe: the driver probe routine, probably from an __init section
648 * @res: set of resources that needs to be allocated for the device
649 * @n_res: number of resources
650 * @data: platform specific data for this platform device
651 * @size: size of platform specific data
652 * @module: module which will be the owner of the driver
654 * Use this in legacy-style modules that probe hardware directly and
655 * register a single platform device and corresponding platform driver.
657 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
659 struct platform_device * __init_or_module __platform_create_bundle(
660 struct platform_driver *driver,
661 int (*probe)(struct platform_device *),
662 struct resource *res, unsigned int n_res,
663 const void *data, size_t size, struct module *module)
665 struct platform_device *pdev;
668 pdev = platform_device_alloc(driver->driver.name, -1);
674 error = platform_device_add_resources(pdev, res, n_res);
678 error = platform_device_add_data(pdev, data, size);
682 error = platform_device_add(pdev);
686 error = __platform_driver_probe(driver, probe, module);
693 platform_device_del(pdev);
695 platform_device_put(pdev);
697 return ERR_PTR(error);
699 EXPORT_SYMBOL_GPL(__platform_create_bundle);
701 /* modalias support enables more hands-off userspace setup:
702 * (a) environment variable lets new-style hotplug events work once system is
703 * fully running: "modprobe $MODALIAS"
704 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
705 * mishandled before system is fully running: "modprobe $(cat modalias)"
707 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
710 struct platform_device *pdev = to_platform_device(dev);
713 len = of_device_get_modalias(dev, buf, PAGE_SIZE -1);
717 len = acpi_device_modalias(dev, buf, PAGE_SIZE -1);
721 len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
723 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
725 static DEVICE_ATTR_RO(modalias);
727 static ssize_t driver_override_store(struct device *dev,
728 struct device_attribute *attr,
729 const char *buf, size_t count)
731 struct platform_device *pdev = to_platform_device(dev);
732 char *driver_override, *old = pdev->driver_override, *cp;
734 if (count > PATH_MAX)
737 driver_override = kstrndup(buf, count, GFP_KERNEL);
738 if (!driver_override)
741 cp = strchr(driver_override, '\n');
745 if (strlen(driver_override)) {
746 pdev->driver_override = driver_override;
748 kfree(driver_override);
749 pdev->driver_override = NULL;
757 static ssize_t driver_override_show(struct device *dev,
758 struct device_attribute *attr, char *buf)
760 struct platform_device *pdev = to_platform_device(dev);
762 return sprintf(buf, "%s\n", pdev->driver_override);
764 static DEVICE_ATTR_RW(driver_override);
767 static struct attribute *platform_dev_attrs[] = {
768 &dev_attr_modalias.attr,
769 &dev_attr_driver_override.attr,
772 ATTRIBUTE_GROUPS(platform_dev);
774 static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
776 struct platform_device *pdev = to_platform_device(dev);
779 /* Some devices have extra OF data and an OF-style MODALIAS */
780 rc = of_device_uevent_modalias(dev, env);
784 rc = acpi_device_uevent_modalias(dev, env);
788 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
793 static const struct platform_device_id *platform_match_id(
794 const struct platform_device_id *id,
795 struct platform_device *pdev)
797 while (id->name[0]) {
798 if (strcmp(pdev->name, id->name) == 0) {
808 * platform_match - bind platform device to platform driver.
812 * Platform device IDs are assumed to be encoded like this:
813 * "<name><instance>", where <name> is a short description of the type of
814 * device, like "pci" or "floppy", and <instance> is the enumerated
815 * instance of the device, like '0' or '42'. Driver IDs are simply
816 * "<name>". So, extract the <name> from the platform_device structure,
817 * and compare it against the name of the driver. Return whether they match
820 static int platform_match(struct device *dev, struct device_driver *drv)
822 struct platform_device *pdev = to_platform_device(dev);
823 struct platform_driver *pdrv = to_platform_driver(drv);
825 /* When driver_override is set, only bind to the matching driver */
826 if (pdev->driver_override)
827 return !strcmp(pdev->driver_override, drv->name);
829 /* Attempt an OF style match first */
830 if (of_driver_match_device(dev, drv))
833 /* Then try ACPI style match */
834 if (acpi_driver_match_device(dev, drv))
837 /* Then try to match against the id table */
839 return platform_match_id(pdrv->id_table, pdev) != NULL;
841 /* fall-back to driver name match */
842 return (strcmp(pdev->name, drv->name) == 0);
845 #ifdef CONFIG_PM_SLEEP
847 static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
849 struct platform_driver *pdrv = to_platform_driver(dev->driver);
850 struct platform_device *pdev = to_platform_device(dev);
853 if (dev->driver && pdrv->suspend)
854 ret = pdrv->suspend(pdev, mesg);
859 static int platform_legacy_resume(struct device *dev)
861 struct platform_driver *pdrv = to_platform_driver(dev->driver);
862 struct platform_device *pdev = to_platform_device(dev);
865 if (dev->driver && pdrv->resume)
866 ret = pdrv->resume(pdev);
871 #endif /* CONFIG_PM_SLEEP */
873 #ifdef CONFIG_SUSPEND
875 int platform_pm_suspend(struct device *dev)
877 struct device_driver *drv = dev->driver;
884 if (drv->pm->suspend)
885 ret = drv->pm->suspend(dev);
887 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
893 int platform_pm_resume(struct device *dev)
895 struct device_driver *drv = dev->driver;
903 ret = drv->pm->resume(dev);
905 ret = platform_legacy_resume(dev);
911 #endif /* CONFIG_SUSPEND */
913 #ifdef CONFIG_HIBERNATE_CALLBACKS
915 int platform_pm_freeze(struct device *dev)
917 struct device_driver *drv = dev->driver;
925 ret = drv->pm->freeze(dev);
927 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
933 int platform_pm_thaw(struct device *dev)
935 struct device_driver *drv = dev->driver;
943 ret = drv->pm->thaw(dev);
945 ret = platform_legacy_resume(dev);
951 int platform_pm_poweroff(struct device *dev)
953 struct device_driver *drv = dev->driver;
960 if (drv->pm->poweroff)
961 ret = drv->pm->poweroff(dev);
963 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
969 int platform_pm_restore(struct device *dev)
971 struct device_driver *drv = dev->driver;
978 if (drv->pm->restore)
979 ret = drv->pm->restore(dev);
981 ret = platform_legacy_resume(dev);
987 #endif /* CONFIG_HIBERNATE_CALLBACKS */
989 static const struct dev_pm_ops platform_dev_pm_ops = {
990 .runtime_suspend = pm_generic_runtime_suspend,
991 .runtime_resume = pm_generic_runtime_resume,
992 USE_PLATFORM_PM_SLEEP_OPS
995 struct bus_type platform_bus_type = {
997 .dev_groups = platform_dev_groups,
998 .match = platform_match,
999 .uevent = platform_uevent,
1000 .pm = &platform_dev_pm_ops,
1002 EXPORT_SYMBOL_GPL(platform_bus_type);
1004 int __init platform_bus_init(void)
1008 early_platform_cleanup();
1010 error = device_register(&platform_bus);
1013 error = bus_register(&platform_bus_type);
1015 device_unregister(&platform_bus);
1016 of_platform_register_reconfig_notifier();
1020 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
1021 u64 dma_get_required_mask(struct device *dev)
1023 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
1024 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
1027 if (!high_totalram) {
1028 /* convert to mask just covering totalram */
1029 low_totalram = (1 << (fls(low_totalram) - 1));
1030 low_totalram += low_totalram - 1;
1031 mask = low_totalram;
1033 high_totalram = (1 << (fls(high_totalram) - 1));
1034 high_totalram += high_totalram - 1;
1035 mask = (((u64)high_totalram) << 32) + 0xffffffff;
1039 EXPORT_SYMBOL_GPL(dma_get_required_mask);
1042 static __initdata LIST_HEAD(early_platform_driver_list);
1043 static __initdata LIST_HEAD(early_platform_device_list);
1046 * early_platform_driver_register - register early platform driver
1047 * @epdrv: early_platform driver structure
1048 * @buf: string passed from early_param()
1050 * Helper function for early_platform_init() / early_platform_init_buffer()
1052 int __init early_platform_driver_register(struct early_platform_driver *epdrv,
1058 /* Simply add the driver to the end of the global list.
1059 * Drivers will by default be put on the list in compiled-in order.
1061 if (!epdrv->list.next) {
1062 INIT_LIST_HEAD(&epdrv->list);
1063 list_add_tail(&epdrv->list, &early_platform_driver_list);
1066 /* If the user has specified device then make sure the driver
1067 * gets prioritized. The driver of the last device specified on
1068 * command line will be put first on the list.
1070 n = strlen(epdrv->pdrv->driver.name);
1071 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
1072 list_move(&epdrv->list, &early_platform_driver_list);
1074 /* Allow passing parameters after device name */
1075 if (buf[n] == '\0' || buf[n] == ',')
1076 epdrv->requested_id = -1;
1078 epdrv->requested_id = simple_strtoul(&buf[n + 1],
1081 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
1082 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
1085 n += strcspn(&buf[n + 1], ",") + 1;
1091 if (epdrv->bufsize) {
1092 memcpy(epdrv->buffer, &buf[n],
1093 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
1094 epdrv->buffer[epdrv->bufsize - 1] = '\0';
1102 * early_platform_add_devices - adds a number of early platform devices
1103 * @devs: array of early platform devices to add
1104 * @num: number of early platform devices in array
1106 * Used by early architecture code to register early platform devices and
1107 * their platform data.
1109 void __init early_platform_add_devices(struct platform_device **devs, int num)
1114 /* simply add the devices to list */
1115 for (i = 0; i < num; i++) {
1116 dev = &devs[i]->dev;
1118 if (!dev->devres_head.next) {
1119 pm_runtime_early_init(dev);
1120 INIT_LIST_HEAD(&dev->devres_head);
1121 list_add_tail(&dev->devres_head,
1122 &early_platform_device_list);
1128 * early_platform_driver_register_all - register early platform drivers
1129 * @class_str: string to identify early platform driver class
1131 * Used by architecture code to register all early platform drivers
1132 * for a certain class. If omitted then only early platform drivers
1133 * with matching kernel command line class parameters will be registered.
1135 void __init early_platform_driver_register_all(char *class_str)
1137 /* The "class_str" parameter may or may not be present on the kernel
1138 * command line. If it is present then there may be more than one
1139 * matching parameter.
1141 * Since we register our early platform drivers using early_param()
1142 * we need to make sure that they also get registered in the case
1143 * when the parameter is missing from the kernel command line.
1145 * We use parse_early_options() to make sure the early_param() gets
1146 * called at least once. The early_param() may be called more than
1147 * once since the name of the preferred device may be specified on
1148 * the kernel command line. early_platform_driver_register() handles
1151 parse_early_options(class_str);
1155 * early_platform_match - find early platform device matching driver
1156 * @epdrv: early platform driver structure
1157 * @id: id to match against
1159 static struct platform_device * __init
1160 early_platform_match(struct early_platform_driver *epdrv, int id)
1162 struct platform_device *pd;
1164 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1165 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1173 * early_platform_left - check if early platform driver has matching devices
1174 * @epdrv: early platform driver structure
1175 * @id: return true if id or above exists
1177 static int __init early_platform_left(struct early_platform_driver *epdrv,
1180 struct platform_device *pd;
1182 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1183 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1191 * early_platform_driver_probe_id - probe drivers matching class_str and id
1192 * @class_str: string to identify early platform driver class
1193 * @id: id to match against
1194 * @nr_probe: number of platform devices to successfully probe before exiting
1196 static int __init early_platform_driver_probe_id(char *class_str,
1200 struct early_platform_driver *epdrv;
1201 struct platform_device *match;
1206 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1207 /* only use drivers matching our class_str */
1208 if (strcmp(class_str, epdrv->class_str))
1212 match_id = epdrv->requested_id;
1217 left += early_platform_left(epdrv, id);
1219 /* skip requested id */
1220 switch (epdrv->requested_id) {
1221 case EARLY_PLATFORM_ID_ERROR:
1222 case EARLY_PLATFORM_ID_UNSET:
1225 if (epdrv->requested_id == id)
1226 match_id = EARLY_PLATFORM_ID_UNSET;
1231 case EARLY_PLATFORM_ID_ERROR:
1232 pr_warn("%s: unable to parse %s parameter\n",
1233 class_str, epdrv->pdrv->driver.name);
1235 case EARLY_PLATFORM_ID_UNSET:
1239 match = early_platform_match(epdrv, match_id);
1244 * Set up a sensible init_name to enable
1245 * dev_name() and others to be used before the
1246 * rest of the driver core is initialized.
1248 if (!match->dev.init_name && slab_is_available()) {
1249 if (match->id != -1)
1250 match->dev.init_name =
1251 kasprintf(GFP_KERNEL, "%s.%d",
1255 match->dev.init_name =
1256 kasprintf(GFP_KERNEL, "%s",
1259 if (!match->dev.init_name)
1263 if (epdrv->pdrv->probe(match))
1264 pr_warn("%s: unable to probe %s early.\n",
1265 class_str, match->name);
1281 * early_platform_driver_probe - probe a class of registered drivers
1282 * @class_str: string to identify early platform driver class
1283 * @nr_probe: number of platform devices to successfully probe before exiting
1284 * @user_only: only probe user specified early platform devices
1286 * Used by architecture code to probe registered early platform drivers
1287 * within a certain class. For probe to happen a registered early platform
1288 * device matching a registered early platform driver is needed.
1290 int __init early_platform_driver_probe(char *class_str,
1297 for (i = -2; n < nr_probe; i++) {
1298 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1313 * early_platform_cleanup - clean up early platform code
1315 void __init early_platform_cleanup(void)
1317 struct platform_device *pd, *pd2;
1319 /* clean up the devres list used to chain devices */
1320 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1322 list_del(&pd->dev.devres_head);
1323 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));