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alistair23-linux/include/linux/platform_device.h
Ulf Hansson 9495b7e92f driver core: platform: Initialize dma_parms for platform devices 
It's currently the platform driver's responsibility to initialize the
pointer, dma_parms, for its corresponding struct device. The benefit with
this approach allows us to avoid the initialization and to not waste memory
for the struct device_dma_parameters, as this can be decided on a case by
case basis.

However, it has turned out that this approach is not very practical.  Not
only does it lead to open coding, but also to real errors. In principle
callers of dma_set_max_seg_size() doesn't check the error code, but just
assumes it succeeds.

For these reasons, let's do the initialization from the common platform bus
at the device registration point. This also follows the way the PCI devices
are being managed, see pci_device_add().

Suggested-by: Christoph Hellwig <hch@lst.de>
Cc: <stable@vger.kernel.org>
Tested-by: Haibo Chen <haibo.chen@nxp.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20200422100954.31211-1-ulf.hansson@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-04-28 17:44:33 +02:00

354 lines
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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* platform_device.h - generic, centralized driver model
*
* Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
*
* See Documentation/driver-api/driver-model/ for more information.
*/
#ifndef _PLATFORM_DEVICE_H_
#define _PLATFORM_DEVICE_H_
#include <linux/device.h>
#define PLATFORM_DEVID_NONE (-1)
#define PLATFORM_DEVID_AUTO (-2)
struct mfd_cell;
struct property_entry;
struct platform_device_id;
struct platform_device {
const char *name;
int id;
bool id_auto;
struct device dev;
u64 platform_dma_mask;
struct device_dma_parameters dma_parms;
u32 num_resources;
struct resource *resource;
const struct platform_device_id *id_entry;
char *driver_override; /* Driver name to force a match */
/* MFD cell pointer */
struct mfd_cell *mfd_cell;
/* arch specific additions */
struct pdev_archdata archdata;
};
#define platform_get_device_id(pdev) ((pdev)->id_entry)
#define dev_is_platform(dev) ((dev)->bus == &platform_bus_type)
#define to_platform_device(x) container_of((x), struct platform_device, dev)
extern int platform_device_register(struct platform_device *);
extern void platform_device_unregister(struct platform_device *);
extern struct bus_type platform_bus_type;
extern struct device platform_bus;
extern struct resource *platform_get_resource(struct platform_device *,
unsigned int, unsigned int);
extern struct device *
platform_find_device_by_driver(struct device *start,
const struct device_driver *drv);
extern void __iomem *
devm_platform_get_and_ioremap_resource(struct platform_device *pdev,
unsigned int index, struct resource **res);
extern void __iomem *
devm_platform_ioremap_resource(struct platform_device *pdev,
unsigned int index);
extern void __iomem *
devm_platform_ioremap_resource_wc(struct platform_device *pdev,
unsigned int index);
extern void __iomem *
devm_platform_ioremap_resource_byname(struct platform_device *pdev,
const char *name);
extern int platform_get_irq(struct platform_device *, unsigned int);
extern int platform_get_irq_optional(struct platform_device *, unsigned int);
extern int platform_irq_count(struct platform_device *);
extern struct resource *platform_get_resource_byname(struct platform_device *,
unsigned int,
const char *);
extern int platform_get_irq_byname(struct platform_device *, const char *);
extern int platform_get_irq_byname_optional(struct platform_device *dev,
const char *name);
extern int platform_add_devices(struct platform_device **, int);
struct platform_device_info {
struct device *parent;
struct fwnode_handle *fwnode;
bool of_node_reused;
const char *name;
int id;
const struct resource *res;
unsigned int num_res;
const void *data;
size_t size_data;
u64 dma_mask;
const struct property_entry *properties;
};
extern struct platform_device *platform_device_register_full(
const struct platform_device_info *pdevinfo);
/**
* platform_device_register_resndata - add a platform-level device with
* resources and platform-specific data
*
* @parent: parent device for the device we're adding
* @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
* @data: platform specific data for this platform device
* @size: size of platform specific data
*
* Returns &struct platform_device pointer on success, or ERR_PTR() on error.
*/
static inline struct platform_device *platform_device_register_resndata(
struct device *parent, const char *name, int id,
const struct resource *res, unsigned int num,
const void *data, size_t size) {
struct platform_device_info pdevinfo = {
.parent = parent,
.name = name,
.id = id,
.res = res,
.num_res = num,
.data = data,
.size_data = size,
.dma_mask = 0,
};
return platform_device_register_full(&pdevinfo);
}
/**
* platform_device_register_simple - add a platform-level device and its resources
* @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".
*
* Returns &struct platform_device pointer on success, or ERR_PTR() on error.
*/
static inline struct platform_device *platform_device_register_simple(
const char *name, int id,
const struct resource *res, unsigned int num)
{
return platform_device_register_resndata(NULL, name, id,
res, num, NULL, 0);
}
/**
* platform_device_register_data - add a platform-level device with platform-specific 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.
*
* Returns &struct platform_device pointer on success, or ERR_PTR() on error.
*/
static inline struct platform_device *platform_device_register_data(
struct device *parent, const char *name, int id,
const void *data, size_t size)
{
return platform_device_register_resndata(parent, name, id,
NULL, 0, data, size);
}
extern struct platform_device *platform_device_alloc(const char *name, int id);
extern int platform_device_add_resources(struct platform_device *pdev,
const struct resource *res,
unsigned int num);
extern int platform_device_add_data(struct platform_device *pdev,
const void *data, size_t size);
extern int platform_device_add_properties(struct platform_device *pdev,
const struct property_entry *properties);
extern int platform_device_add(struct platform_device *pdev);
extern void platform_device_del(struct platform_device *pdev);
extern void platform_device_put(struct platform_device *pdev);
struct platform_driver {
int (*probe)(struct platform_device *);
int (*remove)(struct platform_device *);
void (*shutdown)(struct platform_device *);
int (*suspend)(struct platform_device *, pm_message_t state);
int (*resume)(struct platform_device *);
struct device_driver driver;
const struct platform_device_id *id_table;
bool prevent_deferred_probe;
};
#define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
driver))
/*
* use a macro to avoid include chaining to get THIS_MODULE
*/
#define platform_driver_register(drv) \
__platform_driver_register(drv, THIS_MODULE)
extern int __platform_driver_register(struct platform_driver *,
struct module *);
extern void platform_driver_unregister(struct platform_driver *);
/* non-hotpluggable platform devices may use this so that probe() and
* its support may live in __init sections, conserving runtime memory.
*/
#define platform_driver_probe(drv, probe) \
__platform_driver_probe(drv, probe, THIS_MODULE)
extern int __platform_driver_probe(struct platform_driver *driver,
int (*probe)(struct platform_device *), struct module *module);
static inline void *platform_get_drvdata(const struct platform_device *pdev)
{
return dev_get_drvdata(&pdev->dev);
}
static inline void platform_set_drvdata(struct platform_device *pdev,
void *data)
{
dev_set_drvdata(&pdev->dev, data);
}
/* module_platform_driver() - Helper macro for drivers that don't do
* anything special in module init/exit. This eliminates a lot of
* boilerplate. Each module may only use this macro once, and
* calling it replaces module_init() and module_exit()
*/
#define module_platform_driver(__platform_driver) \
module_driver(__platform_driver, platform_driver_register, \
platform_driver_unregister)
/* builtin_platform_driver() - Helper macro for builtin drivers that
* don't do anything special in driver init. This eliminates some
* boilerplate. Each driver may only use this macro once, and
* calling it replaces device_initcall(). Note this is meant to be
* a parallel of module_platform_driver() above, but w/o _exit stuff.
*/
#define builtin_platform_driver(__platform_driver) \
builtin_driver(__platform_driver, platform_driver_register)
/* module_platform_driver_probe() - Helper macro for drivers that don't do
* anything special in module init/exit. This eliminates a lot of
* boilerplate. Each module may only use this macro once, and
* calling it replaces module_init() and module_exit()
*/
#define module_platform_driver_probe(__platform_driver, __platform_probe) \
static int __init __platform_driver##_init(void) \
{ \
return platform_driver_probe(&(__platform_driver), \
__platform_probe); \
} \
module_init(__platform_driver##_init); \
static void __exit __platform_driver##_exit(void) \
{ \
platform_driver_unregister(&(__platform_driver)); \
} \
module_exit(__platform_driver##_exit);
/* builtin_platform_driver_probe() - Helper macro for drivers that don't do
* anything special in device init. This eliminates some boilerplate. Each
* driver may only use this macro once, and using it replaces device_initcall.
* This is meant to be a parallel of module_platform_driver_probe above, but
* without the __exit parts.
*/
#define builtin_platform_driver_probe(__platform_driver, __platform_probe) \
static int __init __platform_driver##_init(void) \
{ \
return platform_driver_probe(&(__platform_driver), \
__platform_probe); \
} \
device_initcall(__platform_driver##_init); \
#define platform_create_bundle(driver, probe, res, n_res, data, size) \
__platform_create_bundle(driver, probe, res, n_res, data, size, THIS_MODULE)
extern struct platform_device *__platform_create_bundle(
struct platform_driver *driver, int (*probe)(struct platform_device *),
struct resource *res, unsigned int n_res,
const void *data, size_t size, struct module *module);
int __platform_register_drivers(struct platform_driver * const *drivers,
unsigned int count, struct module *owner);
void platform_unregister_drivers(struct platform_driver * const *drivers,
unsigned int count);
#define platform_register_drivers(drivers, count) \
__platform_register_drivers(drivers, count, THIS_MODULE)
#ifdef CONFIG_SUSPEND
extern int platform_pm_suspend(struct device *dev);
extern int platform_pm_resume(struct device *dev);
#else
#define platform_pm_suspend NULL
#define platform_pm_resume NULL
#endif
#ifdef CONFIG_HIBERNATE_CALLBACKS
extern int platform_pm_freeze(struct device *dev);
extern int platform_pm_thaw(struct device *dev);
extern int platform_pm_poweroff(struct device *dev);
extern int platform_pm_restore(struct device *dev);
#else
#define platform_pm_freeze NULL
#define platform_pm_thaw NULL
#define platform_pm_poweroff NULL
#define platform_pm_restore NULL
#endif
extern int platform_dma_configure(struct device *dev);
#ifdef CONFIG_PM_SLEEP
#define USE_PLATFORM_PM_SLEEP_OPS \
.suspend = platform_pm_suspend, \
.resume = platform_pm_resume, \
.freeze = platform_pm_freeze, \
.thaw = platform_pm_thaw, \
.poweroff = platform_pm_poweroff, \
.restore = platform_pm_restore,
#else
#define USE_PLATFORM_PM_SLEEP_OPS
#endif
#ifndef CONFIG_SUPERH
/*
* REVISIT: This stub is needed for all non-SuperH users of early platform
* drivers. It should go away once we introduce the new platform_device-based
* early driver framework.
*/
static inline int is_sh_early_platform_device(struct platform_device *pdev)
{
return 0;
}
#endif /* CONFIG_SUPERH */
#endif /* _PLATFORM_DEVICE_H_ */
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