diff options
Diffstat (limited to 'drivers/base/platform.c')
| -rw-r--r-- | drivers/base/platform.c | 984 |
1 files changed, 984 insertions, 0 deletions
diff --git a/drivers/base/platform.c b/drivers/base/platform.c new file mode 100644 index 0000000..dfcbfe5 --- /dev/null +++ b/drivers/base/platform.c @@ -0,0 +1,984 @@ +/* + * platform.c - platform 'pseudo' bus for legacy devices + * + * Copyright (c) 2002-3 Patrick Mochel + * Copyright (c) 2002-3 Open Source Development Labs + * + * This file is released under the GPLv2 + * + * Please see Documentation/driver-model/platform.txt for more + * information. + */ + +#include <linux/platform_device.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/dma-mapping.h> +#include <linux/bootmem.h> +#include <linux/err.h> +#include <linux/slab.h> + +#include "base.h" + +#define to_platform_driver(drv) (container_of((drv), struct platform_driver, \ + driver)) + +struct device platform_bus = { + .bus_id = "platform", +}; +EXPORT_SYMBOL_GPL(platform_bus); + +/** + * platform_get_resource - get a resource for a device + * @dev: platform device + * @type: resource type + * @num: resource index + */ +struct resource *platform_get_resource(struct platform_device *dev, + unsigned int type, unsigned int num) +{ + int i; + + for (i = 0; i < dev->num_resources; i++) { + struct resource *r = &dev->resource[i]; + + if (type == resource_type(r) && num-- == 0) + return r; + } + return NULL; +} +EXPORT_SYMBOL_GPL(platform_get_resource); + +/** + * platform_get_irq - get an IRQ for a device + * @dev: platform device + * @num: IRQ number index + */ +int platform_get_irq(struct platform_device *dev, unsigned int num) +{ + struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); + + return r ? r->start : -ENXIO; +} +EXPORT_SYMBOL_GPL(platform_get_irq); + +/** + * platform_get_resource_byname - get a resource for a device by name + * @dev: platform device + * @type: resource type + * @name: resource name + */ +struct resource *platform_get_resource_byname(struct platform_device *dev, + unsigned int type, char *name) +{ + int i; + + for (i = 0; i < dev->num_resources; i++) { + struct resource *r = &dev->resource[i]; + + if (type == resource_type(r) && !strcmp(r->name, name)) + return r; + } + return NULL; +} +EXPORT_SYMBOL_GPL(platform_get_resource_byname); + +/** + * platform_get_irq - get an IRQ for a device + * @dev: platform device + * @name: IRQ name + */ +int platform_get_irq_byname(struct platform_device *dev, char *name) +{ + struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, + name); + + return r ? r->start : -ENXIO; +} +EXPORT_SYMBOL_GPL(platform_get_irq_byname); + +/** + * platform_add_devices - add a numbers of platform devices + * @devs: array of platform devices to add + * @num: number of platform devices in array + */ +int platform_add_devices(struct platform_device **devs, int num) +{ + int i, ret = 0; + + for (i = 0; i < num; i++) { + ret = platform_device_register(devs[i]); + if (ret) { + while (--i >= 0) + platform_device_unregister(devs[i]); + break; + } + } + + return ret; +} +EXPORT_SYMBOL_GPL(platform_add_devices); + +struct platform_object { + struct platform_device pdev; + char name[1]; +}; + +/** + * platform_device_put + * @pdev: platform device to free + * + * Free all memory associated with a platform device. This function must + * _only_ be externally called in error cases. All other usage is a bug. + */ +void platform_device_put(struct platform_device *pdev) +{ + if (pdev) + put_device(&pdev->dev); +} +EXPORT_SYMBOL_GPL(platform_device_put); + +static void platform_device_release(struct device *dev) +{ + struct platform_object *pa = container_of(dev, struct platform_object, + pdev.dev); + + kfree(pa->pdev.dev.platform_data); + kfree(pa->pdev.resource); + kfree(pa); +} + +/** + * platform_device_alloc + * @name: base name of the device we're adding + * @id: instance id + * + * Create a platform device object which can have other objects attached + * to it, and which will have attached objects freed when it is released. + */ +struct platform_device *platform_device_alloc(const char *name, int id) +{ + struct platform_object *pa; + + pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); + if (pa) { + strcpy(pa->name, name); + pa->pdev.name = pa->name; + pa->pdev.id = id; + device_initialize(&pa->pdev.dev); + pa->pdev.dev.release = platform_device_release; + } + + return pa ? &pa->pdev : NULL; +} +EXPORT_SYMBOL_GPL(platform_device_alloc); + +/** + * platform_device_add_resources + * @pdev: platform device allocated by platform_device_alloc to add resources to + * @res: set of resources that needs to be allocated for the device + * @num: number of resources + * + * Add a copy of the resources to the platform device. The memory + * associated with the resources will be freed when the platform device is + * released. + */ +int platform_device_add_resources(struct platform_device *pdev, + struct resource *res, unsigned int num) +{ + struct resource *r; + + r = kmalloc(sizeof(struct resource) * num, GFP_KERNEL); + if (r) { + memcpy(r, res, sizeof(struct resource) * num); + pdev->resource = r; + pdev->num_resources = num; + } + return r ? 0 : -ENOMEM; +} +EXPORT_SYMBOL_GPL(platform_device_add_resources); + +/** + * platform_device_add_data + * @pdev: platform device allocated by platform_device_alloc to add resources to + * @data: platform specific data for this platform device + * @size: size of platform specific data + * + * Add a copy of platform specific data to the platform device's + * platform_data pointer. The memory associated with the platform data + * will be freed when the platform device is released. + */ +int platform_device_add_data(struct platform_device *pdev, const void *data, + size_t size) +{ + void *d; + + d = kmalloc(size, GFP_KERNEL); + if (d) { + memcpy(d, data, size); + pdev->dev.platform_data = d; + } + return d ? 0 : -ENOMEM; +} +EXPORT_SYMBOL_GPL(platform_device_add_data); + +/** + * platform_device_add - add a platform device to device hierarchy + * @pdev: platform device we're adding + * + * This is part 2 of platform_device_register(), though may be called + * separately _iff_ pdev was allocated by platform_device_alloc(). + */ +int platform_device_add(struct platform_device *pdev) +{ + int i, ret = 0; + + if (!pdev) + return -EINVAL; + + if (!pdev->dev.parent) + pdev->dev.parent = &platform_bus; + + pdev->dev.bus = &platform_bus_type; + + if (pdev->id != -1) + snprintf(pdev->dev.bus_id, BUS_ID_SIZE, "%s.%d", pdev->name, + pdev->id); + else + strlcpy(pdev->dev.bus_id, pdev->name, BUS_ID_SIZE); + + for (i = 0; i < pdev->num_resources; i++) { + struct resource *p, *r = &pdev->resource[i]; + + if (r->name == NULL) + r->name = pdev->dev.bus_id; + + p = r->parent; + if (!p) { + if (resource_type(r) == IORESOURCE_MEM) + p = &iomem_resource; + else if (resource_type(r) == IORESOURCE_IO) + p = &ioport_resource; + } + + if (p && insert_resource(p, r)) { + printk(KERN_ERR + "%s: failed to claim resource %d\n", + pdev->dev.bus_id, i); + ret = -EBUSY; + goto failed; + } + } + + pr_debug("Registering platform device '%s'. Parent at %s\n", + pdev->dev.bus_id, pdev->dev.parent->bus_id); + + ret = device_add(&pdev->dev); + if (ret == 0) + return ret; + + failed: + while (--i >= 0) { + struct resource *r = &pdev->resource[i]; + unsigned long type = resource_type(r); + + if (type == IORESOURCE_MEM || type == IORESOURCE_IO) + release_resource(r); + } + + return ret; +} +EXPORT_SYMBOL_GPL(platform_device_add); + +/** + * platform_device_del - remove a platform-level device + * @pdev: platform device we're removing + * + * Note that this function will also release all memory- and port-based + * resources owned by the device (@dev->resource). This function must + * _only_ be externally called in error cases. All other usage is a bug. + */ +void platform_device_del(struct platform_device *pdev) +{ + int i; + + if (pdev) { + device_del(&pdev->dev); + + for (i = 0; i < pdev->num_resources; i++) { + struct resource *r = &pdev->resource[i]; + unsigned long type = resource_type(r); + + if (type == IORESOURCE_MEM || type == IORESOURCE_IO) + release_resource(r); + } + } +} +EXPORT_SYMBOL_GPL(platform_device_del); + +/** + * platform_device_register - add a platform-level device + * @pdev: platform device we're adding + */ +int platform_device_register(struct platform_device *pdev) +{ + device_initialize(&pdev->dev); + return platform_device_add(pdev); +} +EXPORT_SYMBOL_GPL(platform_device_register); + +/** + * platform_device_unregister - unregister a platform-level device + * @pdev: platform device we're unregistering + * + * Unregistration is done in 2 steps. First we release all resources + * and remove it from the subsystem, then we drop reference count by + * calling platform_device_put(). + */ +void platform_device_unregister(struct platform_device *pdev) +{ + platform_device_del(pdev); + platform_device_put(pdev); +} +EXPORT_SYMBOL_GPL(platform_device_unregister); + +/** + * platform_device_register_simple + * @name: base name of the device we're adding + * @id: instance id + * @res: set of resources that needs to be allocated for the device + * @num: number of resources + * + * This function creates a simple platform device that requires minimal + * resource and memory management. Canned release function freeing memory + * allocated for the device allows drivers using such devices to be + * unloaded without waiting for the last reference to the device to be + * dropped. + * + * This interface is primarily intended for use with legacy drivers which + * probe hardware directly. Because such drivers create sysfs device nodes + * themselves, rather than letting system infrastructure handle such device + * enumeration tasks, they don't fully conform to the Linux driver model. + * In particular, when such drivers are built as modules, they can't be + * "hotplugged". + */ +struct platform_device *platform_device_register_simple(const char *name, + int id, + struct resource *res, + unsigned int num) +{ + struct platform_device *pdev; + int retval; + + pdev = platform_device_alloc(name, id); + if (!pdev) { + retval = -ENOMEM; + goto error; + } + + if (num) { + retval = platform_device_add_resources(pdev, res, num); + if (retval) + goto error; + } + + retval = platform_device_add(pdev); + if (retval) + goto error; + + return pdev; + +error: + platform_device_put(pdev); + return ERR_PTR(retval); +} +EXPORT_SYMBOL_GPL(platform_device_register_simple); + +/** + * platform_device_register_data + * @parent: parent device for the device we're adding + * @name: base name of the device we're adding + * @id: instance id + * @data: platform specific data for this platform device + * @size: size of platform specific data + * + * This function creates a simple platform device that requires minimal + * resource and memory management. Canned release function freeing memory + * allocated for the device allows drivers using such devices to be + * unloaded without waiting for the last reference to the device to be + * dropped. + */ +struct platform_device *platform_device_register_data( + struct device *parent, + const char *name, int id, + const void *data, size_t size) +{ + struct platform_device *pdev; + int retval; + + pdev = platform_device_alloc(name, id); + if (!pdev) { + retval = -ENOMEM; + goto error; + } + + pdev->dev.parent = parent; + + if (size) { + retval = platform_device_add_data(pdev, data, size); + if (retval) + goto error; + } + + retval = platform_device_add(pdev); + if (retval) + goto error; + + return pdev; + +error: + platform_device_put(pdev); + return ERR_PTR(retval); +} + +static int platform_drv_probe(struct device *_dev) +{ + struct platform_driver *drv = to_platform_driver(_dev->driver); + struct platform_device *dev = to_platform_device(_dev); + + return drv->probe(dev); +} + +static int platform_drv_probe_fail(struct device *_dev) +{ + return -ENXIO; +} + +static int platform_drv_remove(struct device *_dev) +{ + struct platform_driver *drv = to_platform_driver(_dev->driver); + struct platform_device *dev = to_platform_device(_dev); + + return drv->remove(dev); +} + +static void platform_drv_shutdown(struct device *_dev) +{ + struct platform_driver *drv = to_platform_driver(_dev->driver); + struct platform_device *dev = to_platform_device(_dev); + + drv->shutdown(dev); +} + +static int platform_drv_suspend(struct device *_dev, pm_message_t state) +{ + struct platform_driver *drv = to_platform_driver(_dev->driver); + struct platform_device *dev = to_platform_device(_dev); + + return drv->suspend(dev, state); +} + +static int platform_drv_resume(struct device *_dev) +{ + struct platform_driver *drv = to_platform_driver(_dev->driver); + struct platform_device *dev = to_platform_device(_dev); + + return drv->resume(dev); +} + +/** + * platform_driver_register + * @drv: platform driver structure + */ +int platform_driver_register(struct platform_driver *drv) +{ + drv->driver.bus = &platform_bus_type; + if (drv->probe) + drv->driver.probe = platform_drv_probe; + if (drv->remove) + drv->driver.remove = platform_drv_remove; + if (drv->shutdown) + drv->driver.shutdown = platform_drv_shutdown; + if (drv->suspend) + drv->driver.suspend = platform_drv_suspend; + if (drv->resume) + drv->driver.resume = platform_drv_resume; + if (drv->pm) + drv->driver.pm = &drv->pm->base; + return driver_register(&drv->driver); +} +EXPORT_SYMBOL_GPL(platform_driver_register); + +/** + * platform_driver_unregister + * @drv: platform driver structure + */ +void platform_driver_unregister(struct platform_driver *drv) +{ + driver_unregister(&drv->driver); +} +EXPORT_SYMBOL_GPL(platform_driver_unregister); + +/** + * platform_driver_probe - register driver for non-hotpluggable device + * @drv: platform driver structure + * @probe: the driver probe routine, probably from an __init section + * + * Use this instead of platform_driver_register() when you know the device + * is not hotpluggable and has already been registered, and you want to + * remove its run-once probe() infrastructure from memory after the driver + * has bound to the device. + * + * One typical use for this would be with drivers for controllers integrated + * into system-on-chip processors, where the controller devices have been + * configured as part of board setup. + * + * Returns zero if the driver registered and bound to a device, else returns + * a negative error code and with the driver not registered. + */ +int __init_or_module platform_driver_probe(struct platform_driver *drv, + int (*probe)(struct platform_device *)) +{ + int retval, code; + + /* temporary section violation during probe() */ + drv->probe = probe; + retval = code = platform_driver_register(drv); + + /* Fixup that section violation, being paranoid about code scanning + * the list of drivers in order to probe new devices. Check to see + * if the probe was successful, and make sure any forced probes of + * new devices fail. + */ + spin_lock(&platform_bus_type.p->klist_drivers.k_lock); + drv->probe = NULL; + if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) + retval = -ENODEV; + drv->driver.probe = platform_drv_probe_fail; + spin_unlock(&platform_bus_type.p->klist_drivers.k_lock); + + if (code != retval) + platform_driver_unregister(drv); + return retval; +} +EXPORT_SYMBOL_GPL(platform_driver_probe); + +/* modalias support enables more hands-off userspace setup: + * (a) environment variable lets new-style hotplug events work once system is + * fully running: "modprobe $MODALIAS" + * (b) sysfs attribute lets new-style coldplug recover from hotplug events + * mishandled before system is fully running: "modprobe $(cat modalias)" + */ +static ssize_t modalias_show(struct device *dev, struct device_attribute *a, + char *buf) +{ + struct platform_device *pdev = to_platform_device(dev); + int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); + + return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; +} + +static struct device_attribute platform_dev_attrs[] = { + __ATTR_RO(modalias), + __ATTR_NULL, +}; + +static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + struct platform_device *pdev = to_platform_device(dev); + + add_uevent_var(env, "MODALIAS=platform:%s", pdev->name); + return 0; +} + +/** + * platform_match - bind platform device to platform driver. + * @dev: device. + * @drv: driver. + * + * Platform device IDs are assumed to be encoded like this: + * "<name><instance>", where <name> is a short description of the type of + * device, like "pci" or "floppy", and <instance> is the enumerated + * instance of the device, like '0' or '42'. Driver IDs are simply + * "<name>". So, extract the <name> from the platform_device structure, + * and compare it against the name of the driver. Return whether they match + * or not. + */ +static int platform_match(struct device *dev, struct device_driver *drv) +{ + struct platform_device *pdev; + + pdev = container_of(dev, struct platform_device, dev); + return (strncmp(pdev->name, drv->name, BUS_ID_SIZE) == 0); +} + +#ifdef CONFIG_PM_SLEEP + +static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) +{ + int ret = 0; + + if (dev->driver && dev->driver->suspend) + ret = dev->driver->suspend(dev, mesg); + + return ret; +} + +static int platform_legacy_suspend_late(struct device *dev, pm_message_t mesg) +{ + struct platform_driver *drv = to_platform_driver(dev->driver); + struct platform_device *pdev; + int ret = 0; + + pdev = container_of(dev, struct platform_device, dev); + if (dev->driver && drv->suspend_late) + ret = drv->suspend_late(pdev, mesg); + + return ret; +} + +static int platform_legacy_resume_early(struct device *dev) +{ + struct platform_driver *drv = to_platform_driver(dev->driver); + struct platform_device *pdev; + int ret = 0; + + pdev = container_of(dev, struct platform_device, dev); + if (dev->driver && drv->resume_early) + ret = drv->resume_early(pdev); + + return ret; +} + +static int platform_legacy_resume(struct device *dev) +{ + int ret = 0; + + if (dev->driver && dev->driver->resume) + ret = dev->driver->resume(dev); + + return ret; +} + +static int platform_pm_prepare(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (drv && drv->pm && drv->pm->prepare) + ret = drv->pm->prepare(dev); + + return ret; +} + +static void platform_pm_complete(struct device *dev) +{ + struct device_driver *drv = dev->driver; + + if (drv && drv->pm && drv->pm->complete) + drv->pm->complete(dev); +} + +#ifdef CONFIG_SUSPEND + +static int platform_pm_suspend(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (drv && drv->pm) { + if (drv->pm->suspend) + ret = drv->pm->suspend(dev); + } else { + ret = platform_legacy_suspend(dev, PMSG_SUSPEND); + } + + return ret; +} + +static int platform_pm_suspend_noirq(struct device *dev) +{ + struct platform_driver *pdrv; + int ret = 0; + + if (!dev->driver) + return 0; + + pdrv = to_platform_driver(dev->driver); + if (pdrv->pm) { + if (pdrv->pm->suspend_noirq) + ret = pdrv->pm->suspend_noirq(dev); + } else { + ret = platform_legacy_suspend_late(dev, PMSG_SUSPEND); + } + + return ret; +} + +static int platform_pm_resume(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (drv && drv->pm) { + if (drv->pm->resume) + ret = drv->pm->resume(dev); + } else { + ret = platform_legacy_resume(dev); + } + + return ret; +} + +static int platform_pm_resume_noirq(struct device *dev) +{ + struct platform_driver *pdrv; + int ret = 0; + + if (!dev->driver) + return 0; + + pdrv = to_platform_driver(dev->driver); + if (pdrv->pm) { + if (pdrv->pm->resume_noirq) + ret = pdrv->pm->resume_noirq(dev); + } else { + ret = platform_legacy_resume_early(dev); + } + + return ret; +} + +#else /* !CONFIG_SUSPEND */ + +#define platform_pm_suspend NULL +#define platform_pm_resume NULL +#define platform_pm_suspend_noirq NULL +#define platform_pm_resume_noirq NULL + +#endif /* !CONFIG_SUSPEND */ + +#ifdef CONFIG_HIBERNATION + +static int platform_pm_freeze(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (!drv) + return 0; + + if (drv->pm) { + if (drv->pm->freeze) + ret = drv->pm->freeze(dev); + } else { + ret = platform_legacy_suspend(dev, PMSG_FREEZE); + } + + return ret; +} + +static int platform_pm_freeze_noirq(struct device *dev) +{ + struct platform_driver *pdrv; + int ret = 0; + + if (!dev->driver) + return 0; + + pdrv = to_platform_driver(dev->driver); + if (pdrv->pm) { + if (pdrv->pm->freeze_noirq) + ret = pdrv->pm->freeze_noirq(dev); + } else { + ret = platform_legacy_suspend_late(dev, PMSG_FREEZE); + } + + return ret; +} + +static int platform_pm_thaw(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (drv && drv->pm) { + if (drv->pm->thaw) + ret = drv->pm->thaw(dev); + } else { + ret = platform_legacy_resume(dev); + } + + return ret; +} + +static int platform_pm_thaw_noirq(struct device *dev) +{ + struct platform_driver *pdrv; + int ret = 0; + + if (!dev->driver) + return 0; + + pdrv = to_platform_driver(dev->driver); + if (pdrv->pm) { + if (pdrv->pm->thaw_noirq) + ret = pdrv->pm->thaw_noirq(dev); + } else { + ret = platform_legacy_resume_early(dev); + } + + return ret; +} + +static int platform_pm_poweroff(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (drv && drv->pm) { + if (drv->pm->poweroff) + ret = drv->pm->poweroff(dev); + } else { + ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); + } + + return ret; +} + +static int platform_pm_poweroff_noirq(struct device *dev) +{ + struct platform_driver *pdrv; + int ret = 0; + + if (!dev->driver) + return 0; + + pdrv = to_platform_driver(dev->driver); + if (pdrv->pm) { + if (pdrv->pm->poweroff_noirq) + ret = pdrv->pm->poweroff_noirq(dev); + } else { + ret = platform_legacy_suspend_late(dev, PMSG_HIBERNATE); + } + + return ret; +} + +static int platform_pm_restore(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (drv && drv->pm) { + if (drv->pm->restore) + ret = drv->pm->restore(dev); + } else { + ret = platform_legacy_resume(dev); + } + + return ret; +} + +static int platform_pm_restore_noirq(struct device *dev) +{ + struct platform_driver *pdrv; + int ret = 0; + + if (!dev->driver) + return 0; + + pdrv = to_platform_driver(dev->driver); + if (pdrv->pm) { + if (pdrv->pm->restore_noirq) + ret = pdrv->pm->restore_noirq(dev); + } else { + ret = platform_legacy_resume_early(dev); + } + + return ret; +} + +#else /* !CONFIG_HIBERNATION */ + +#define platform_pm_freeze NULL +#define platform_pm_thaw NULL +#define platform_pm_poweroff NULL +#define platform_pm_restore NULL +#define platform_pm_freeze_noirq NULL +#define platform_pm_thaw_noirq NULL +#define platform_pm_poweroff_noirq NULL +#define platform_pm_restore_noirq NULL + +#endif /* !CONFIG_HIBERNATION */ + +static struct pm_ext_ops platform_pm_ops = { + .base = { + .prepare = platform_pm_prepare, + .complete = platform_pm_complete, + .suspend = platform_pm_suspend, + .resume = platform_pm_resume, + .freeze = platform_pm_freeze, + .thaw = platform_pm_thaw, + .poweroff = platform_pm_poweroff, + .restore = platform_pm_restore, + }, + .suspend_noirq = platform_pm_suspend_noirq, + .resume_noirq = platform_pm_resume_noirq, + .freeze_noirq = platform_pm_freeze_noirq, + .thaw_noirq = platform_pm_thaw_noirq, + .poweroff_noirq = platform_pm_poweroff_noirq, + .restore_noirq = platform_pm_restore_noirq, +}; + +#define PLATFORM_PM_OPS_PTR &platform_pm_ops + +#else /* !CONFIG_PM_SLEEP */ + +#define PLATFORM_PM_OPS_PTR NULL + +#endif /* !CONFIG_PM_SLEEP */ + +struct bus_type platform_bus_type = { + .name = "platform", + .dev_attrs = platform_dev_attrs, + .match = platform_match, + .uevent = platform_uevent, + .pm = PLATFORM_PM_OPS_PTR, +}; +EXPORT_SYMBOL_GPL(platform_bus_type); + +int __init platform_bus_init(void) +{ + int error; + + error = device_register(&platform_bus); + if (error) + return error; + error = bus_register(&platform_bus_type); + if (error) + device_unregister(&platform_bus); + return error; +} + +#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK +u64 dma_get_required_mask(struct device *dev) +{ + u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); + u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); + u64 mask; + + if (!high_totalram) { + /* convert to mask just covering totalram */ + low_totalram = (1 << (fls(low_totalram) - 1)); + low_totalram += low_totalram - 1; + mask = low_totalram; + } else { + high_totalram = (1 << (fls(high_totalram) - 1)); + high_totalram += high_totalram - 1; + mask = (((u64)high_totalram) << 32) + 0xffffffff; + } + return mask; +} +EXPORT_SYMBOL_GPL(dma_get_required_mask); +#endif |
