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 && drv->probe) {
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);
542 ret = drv->remove(dev);
543 dev_pm_domain_detach(_dev, true);
548 static void platform_drv_shutdown(struct device *_dev)
550 struct platform_driver *drv = to_platform_driver(_dev->driver);
551 struct platform_device *dev = to_platform_device(_dev);
555 dev_pm_domain_detach(_dev, true);
559 * __platform_driver_register - register a driver for platform-level devices
560 * @drv: platform driver structure
561 * @owner: owning module/driver
563 int __platform_driver_register(struct platform_driver *drv,
564 struct module *owner)
566 drv->driver.owner = owner;
567 drv->driver.bus = &platform_bus_type;
568 drv->driver.probe = platform_drv_probe;
569 drv->driver.remove = platform_drv_remove;
570 drv->driver.shutdown = platform_drv_shutdown;
572 return driver_register(&drv->driver);
574 EXPORT_SYMBOL_GPL(__platform_driver_register);
577 * platform_driver_unregister - unregister a driver for platform-level devices
578 * @drv: platform driver structure
580 void platform_driver_unregister(struct platform_driver *drv)
582 driver_unregister(&drv->driver);
584 EXPORT_SYMBOL_GPL(platform_driver_unregister);
587 * __platform_driver_probe - register driver for non-hotpluggable device
588 * @drv: platform driver structure
589 * @probe: the driver probe routine, probably from an __init section
590 * @module: module which will be the owner of the driver
592 * Use this instead of platform_driver_register() when you know the device
593 * is not hotpluggable and has already been registered, and you want to
594 * remove its run-once probe() infrastructure from memory after the driver
595 * has bound to the device.
597 * One typical use for this would be with drivers for controllers integrated
598 * into system-on-chip processors, where the controller devices have been
599 * configured as part of board setup.
601 * Note that this is incompatible with deferred probing.
603 * Returns zero if the driver registered and bound to a device, else returns
604 * a negative error code and with the driver not registered.
606 int __init_or_module __platform_driver_probe(struct platform_driver *drv,
607 int (*probe)(struct platform_device *), struct module *module)
611 if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) {
612 pr_err("%s: drivers registered with %s can not be probed asynchronously\n",
613 drv->driver.name, __func__);
618 * We have to run our probes synchronously because we check if
619 * we find any devices to bind to and exit with error if there
622 drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS;
625 * Prevent driver from requesting probe deferral to avoid further
626 * futile probe attempts.
628 drv->prevent_deferred_probe = true;
630 /* make sure driver won't have bind/unbind attributes */
631 drv->driver.suppress_bind_attrs = true;
633 /* temporary section violation during probe() */
635 retval = code = __platform_driver_register(drv, module);
638 * Fixup that section violation, being paranoid about code scanning
639 * the list of drivers in order to probe new devices. Check to see
640 * if the probe was successful, and make sure any forced probes of
643 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
645 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
647 drv->driver.probe = platform_drv_probe_fail;
648 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
651 platform_driver_unregister(drv);
654 EXPORT_SYMBOL_GPL(__platform_driver_probe);
657 * __platform_create_bundle - register driver and create corresponding device
658 * @driver: platform driver structure
659 * @probe: the driver probe routine, probably from an __init section
660 * @res: set of resources that needs to be allocated for the device
661 * @n_res: number of resources
662 * @data: platform specific data for this platform device
663 * @size: size of platform specific data
664 * @module: module which will be the owner of the driver
666 * Use this in legacy-style modules that probe hardware directly and
667 * register a single platform device and corresponding platform driver.
669 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
671 struct platform_device * __init_or_module __platform_create_bundle(
672 struct platform_driver *driver,
673 int (*probe)(struct platform_device *),
674 struct resource *res, unsigned int n_res,
675 const void *data, size_t size, struct module *module)
677 struct platform_device *pdev;
680 pdev = platform_device_alloc(driver->driver.name, -1);
686 error = platform_device_add_resources(pdev, res, n_res);
690 error = platform_device_add_data(pdev, data, size);
694 error = platform_device_add(pdev);
698 error = __platform_driver_probe(driver, probe, module);
705 platform_device_del(pdev);
707 platform_device_put(pdev);
709 return ERR_PTR(error);
711 EXPORT_SYMBOL_GPL(__platform_create_bundle);
713 /* modalias support enables more hands-off userspace setup:
714 * (a) environment variable lets new-style hotplug events work once system is
715 * fully running: "modprobe $MODALIAS"
716 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
717 * mishandled before system is fully running: "modprobe $(cat modalias)"
719 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
722 struct platform_device *pdev = to_platform_device(dev);
725 len = of_device_get_modalias(dev, buf, PAGE_SIZE -1);
729 len = acpi_device_modalias(dev, buf, PAGE_SIZE -1);
733 len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
735 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
737 static DEVICE_ATTR_RO(modalias);
739 static ssize_t driver_override_store(struct device *dev,
740 struct device_attribute *attr,
741 const char *buf, size_t count)
743 struct platform_device *pdev = to_platform_device(dev);
744 char *driver_override, *old = pdev->driver_override, *cp;
746 if (count > PATH_MAX)
749 driver_override = kstrndup(buf, count, GFP_KERNEL);
750 if (!driver_override)
753 cp = strchr(driver_override, '\n');
757 if (strlen(driver_override)) {
758 pdev->driver_override = driver_override;
760 kfree(driver_override);
761 pdev->driver_override = NULL;
769 static ssize_t driver_override_show(struct device *dev,
770 struct device_attribute *attr, char *buf)
772 struct platform_device *pdev = to_platform_device(dev);
774 return sprintf(buf, "%s\n", pdev->driver_override);
776 static DEVICE_ATTR_RW(driver_override);
779 static struct attribute *platform_dev_attrs[] = {
780 &dev_attr_modalias.attr,
781 &dev_attr_driver_override.attr,
784 ATTRIBUTE_GROUPS(platform_dev);
786 static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
788 struct platform_device *pdev = to_platform_device(dev);
791 /* Some devices have extra OF data and an OF-style MODALIAS */
792 rc = of_device_uevent_modalias(dev, env);
796 rc = acpi_device_uevent_modalias(dev, env);
800 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
805 static const struct platform_device_id *platform_match_id(
806 const struct platform_device_id *id,
807 struct platform_device *pdev)
809 while (id->name[0]) {
810 if (strcmp(pdev->name, id->name) == 0) {
820 * platform_match - bind platform device to platform driver.
824 * Platform device IDs are assumed to be encoded like this:
825 * "<name><instance>", where <name> is a short description of the type of
826 * device, like "pci" or "floppy", and <instance> is the enumerated
827 * instance of the device, like '0' or '42'. Driver IDs are simply
828 * "<name>". So, extract the <name> from the platform_device structure,
829 * and compare it against the name of the driver. Return whether they match
832 static int platform_match(struct device *dev, struct device_driver *drv)
834 struct platform_device *pdev = to_platform_device(dev);
835 struct platform_driver *pdrv = to_platform_driver(drv);
837 /* When driver_override is set, only bind to the matching driver */
838 if (pdev->driver_override)
839 return !strcmp(pdev->driver_override, drv->name);
841 /* Attempt an OF style match first */
842 if (of_driver_match_device(dev, drv))
845 /* Then try ACPI style match */
846 if (acpi_driver_match_device(dev, drv))
849 /* Then try to match against the id table */
851 return platform_match_id(pdrv->id_table, pdev) != NULL;
853 /* fall-back to driver name match */
854 return (strcmp(pdev->name, drv->name) == 0);
857 #ifdef CONFIG_PM_SLEEP
859 static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
861 struct platform_driver *pdrv = to_platform_driver(dev->driver);
862 struct platform_device *pdev = to_platform_device(dev);
865 if (dev->driver && pdrv->suspend)
866 ret = pdrv->suspend(pdev, mesg);
871 static int platform_legacy_resume(struct device *dev)
873 struct platform_driver *pdrv = to_platform_driver(dev->driver);
874 struct platform_device *pdev = to_platform_device(dev);
877 if (dev->driver && pdrv->resume)
878 ret = pdrv->resume(pdev);
883 #endif /* CONFIG_PM_SLEEP */
885 #ifdef CONFIG_SUSPEND
887 int platform_pm_suspend(struct device *dev)
889 struct device_driver *drv = dev->driver;
896 if (drv->pm->suspend)
897 ret = drv->pm->suspend(dev);
899 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
905 int platform_pm_resume(struct device *dev)
907 struct device_driver *drv = dev->driver;
915 ret = drv->pm->resume(dev);
917 ret = platform_legacy_resume(dev);
923 #endif /* CONFIG_SUSPEND */
925 #ifdef CONFIG_HIBERNATE_CALLBACKS
927 int platform_pm_freeze(struct device *dev)
929 struct device_driver *drv = dev->driver;
937 ret = drv->pm->freeze(dev);
939 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
945 int platform_pm_thaw(struct device *dev)
947 struct device_driver *drv = dev->driver;
955 ret = drv->pm->thaw(dev);
957 ret = platform_legacy_resume(dev);
963 int platform_pm_poweroff(struct device *dev)
965 struct device_driver *drv = dev->driver;
972 if (drv->pm->poweroff)
973 ret = drv->pm->poweroff(dev);
975 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
981 int platform_pm_restore(struct device *dev)
983 struct device_driver *drv = dev->driver;
990 if (drv->pm->restore)
991 ret = drv->pm->restore(dev);
993 ret = platform_legacy_resume(dev);
999 #endif /* CONFIG_HIBERNATE_CALLBACKS */
1001 static const struct dev_pm_ops platform_dev_pm_ops = {
1002 .runtime_suspend = pm_generic_runtime_suspend,
1003 .runtime_resume = pm_generic_runtime_resume,
1004 USE_PLATFORM_PM_SLEEP_OPS
1007 struct bus_type platform_bus_type = {
1009 .dev_groups = platform_dev_groups,
1010 .match = platform_match,
1011 .uevent = platform_uevent,
1012 .pm = &platform_dev_pm_ops,
1014 EXPORT_SYMBOL_GPL(platform_bus_type);
1016 int __init platform_bus_init(void)
1020 early_platform_cleanup();
1022 error = device_register(&platform_bus);
1025 error = bus_register(&platform_bus_type);
1027 device_unregister(&platform_bus);
1028 of_platform_register_reconfig_notifier();
1032 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
1033 u64 dma_get_required_mask(struct device *dev)
1035 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
1036 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
1039 if (!high_totalram) {
1040 /* convert to mask just covering totalram */
1041 low_totalram = (1 << (fls(low_totalram) - 1));
1042 low_totalram += low_totalram - 1;
1043 mask = low_totalram;
1045 high_totalram = (1 << (fls(high_totalram) - 1));
1046 high_totalram += high_totalram - 1;
1047 mask = (((u64)high_totalram) << 32) + 0xffffffff;
1051 EXPORT_SYMBOL_GPL(dma_get_required_mask);
1054 static __initdata LIST_HEAD(early_platform_driver_list);
1055 static __initdata LIST_HEAD(early_platform_device_list);
1058 * early_platform_driver_register - register early platform driver
1059 * @epdrv: early_platform driver structure
1060 * @buf: string passed from early_param()
1062 * Helper function for early_platform_init() / early_platform_init_buffer()
1064 int __init early_platform_driver_register(struct early_platform_driver *epdrv,
1070 /* Simply add the driver to the end of the global list.
1071 * Drivers will by default be put on the list in compiled-in order.
1073 if (!epdrv->list.next) {
1074 INIT_LIST_HEAD(&epdrv->list);
1075 list_add_tail(&epdrv->list, &early_platform_driver_list);
1078 /* If the user has specified device then make sure the driver
1079 * gets prioritized. The driver of the last device specified on
1080 * command line will be put first on the list.
1082 n = strlen(epdrv->pdrv->driver.name);
1083 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
1084 list_move(&epdrv->list, &early_platform_driver_list);
1086 /* Allow passing parameters after device name */
1087 if (buf[n] == '\0' || buf[n] == ',')
1088 epdrv->requested_id = -1;
1090 epdrv->requested_id = simple_strtoul(&buf[n + 1],
1093 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
1094 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
1097 n += strcspn(&buf[n + 1], ",") + 1;
1103 if (epdrv->bufsize) {
1104 memcpy(epdrv->buffer, &buf[n],
1105 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
1106 epdrv->buffer[epdrv->bufsize - 1] = '\0';
1114 * early_platform_add_devices - adds a number of early platform devices
1115 * @devs: array of early platform devices to add
1116 * @num: number of early platform devices in array
1118 * Used by early architecture code to register early platform devices and
1119 * their platform data.
1121 void __init early_platform_add_devices(struct platform_device **devs, int num)
1126 /* simply add the devices to list */
1127 for (i = 0; i < num; i++) {
1128 dev = &devs[i]->dev;
1130 if (!dev->devres_head.next) {
1131 pm_runtime_early_init(dev);
1132 INIT_LIST_HEAD(&dev->devres_head);
1133 list_add_tail(&dev->devres_head,
1134 &early_platform_device_list);
1140 * early_platform_driver_register_all - register early platform drivers
1141 * @class_str: string to identify early platform driver class
1143 * Used by architecture code to register all early platform drivers
1144 * for a certain class. If omitted then only early platform drivers
1145 * with matching kernel command line class parameters will be registered.
1147 void __init early_platform_driver_register_all(char *class_str)
1149 /* The "class_str" parameter may or may not be present on the kernel
1150 * command line. If it is present then there may be more than one
1151 * matching parameter.
1153 * Since we register our early platform drivers using early_param()
1154 * we need to make sure that they also get registered in the case
1155 * when the parameter is missing from the kernel command line.
1157 * We use parse_early_options() to make sure the early_param() gets
1158 * called at least once. The early_param() may be called more than
1159 * once since the name of the preferred device may be specified on
1160 * the kernel command line. early_platform_driver_register() handles
1163 parse_early_options(class_str);
1167 * early_platform_match - find early platform device matching driver
1168 * @epdrv: early platform driver structure
1169 * @id: id to match against
1171 static struct platform_device * __init
1172 early_platform_match(struct early_platform_driver *epdrv, int id)
1174 struct platform_device *pd;
1176 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1177 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1185 * early_platform_left - check if early platform driver has matching devices
1186 * @epdrv: early platform driver structure
1187 * @id: return true if id or above exists
1189 static int __init early_platform_left(struct early_platform_driver *epdrv,
1192 struct platform_device *pd;
1194 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1195 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1203 * early_platform_driver_probe_id - probe drivers matching class_str and id
1204 * @class_str: string to identify early platform driver class
1205 * @id: id to match against
1206 * @nr_probe: number of platform devices to successfully probe before exiting
1208 static int __init early_platform_driver_probe_id(char *class_str,
1212 struct early_platform_driver *epdrv;
1213 struct platform_device *match;
1218 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1219 /* only use drivers matching our class_str */
1220 if (strcmp(class_str, epdrv->class_str))
1224 match_id = epdrv->requested_id;
1229 left += early_platform_left(epdrv, id);
1231 /* skip requested id */
1232 switch (epdrv->requested_id) {
1233 case EARLY_PLATFORM_ID_ERROR:
1234 case EARLY_PLATFORM_ID_UNSET:
1237 if (epdrv->requested_id == id)
1238 match_id = EARLY_PLATFORM_ID_UNSET;
1243 case EARLY_PLATFORM_ID_ERROR:
1244 pr_warn("%s: unable to parse %s parameter\n",
1245 class_str, epdrv->pdrv->driver.name);
1247 case EARLY_PLATFORM_ID_UNSET:
1251 match = early_platform_match(epdrv, match_id);
1256 * Set up a sensible init_name to enable
1257 * dev_name() and others to be used before the
1258 * rest of the driver core is initialized.
1260 if (!match->dev.init_name && slab_is_available()) {
1261 if (match->id != -1)
1262 match->dev.init_name =
1263 kasprintf(GFP_KERNEL, "%s.%d",
1267 match->dev.init_name =
1268 kasprintf(GFP_KERNEL, "%s",
1271 if (!match->dev.init_name)
1275 if (epdrv->pdrv->probe(match))
1276 pr_warn("%s: unable to probe %s early.\n",
1277 class_str, match->name);
1293 * early_platform_driver_probe - probe a class of registered drivers
1294 * @class_str: string to identify early platform driver class
1295 * @nr_probe: number of platform devices to successfully probe before exiting
1296 * @user_only: only probe user specified early platform devices
1298 * Used by architecture code to probe registered early platform drivers
1299 * within a certain class. For probe to happen a registered early platform
1300 * device matching a registered early platform driver is needed.
1302 int __init early_platform_driver_probe(char *class_str,
1309 for (i = -2; n < nr_probe; i++) {
1310 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1325 * early_platform_cleanup - clean up early platform code
1327 void __init early_platform_cleanup(void)
1329 struct platform_device *pd, *pd2;
1331 /* clean up the devres list used to chain devices */
1332 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1334 list_del(&pd->dev.devres_head);
1335 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));