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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __OF_RESERVED_MEM_H
#define __OF_RESERVED_MEM_H
#include <linux/device.h>
#include <linux/of.h>
struct of_phandle_args;
struct reserved_mem_ops;
struct resource;
struct reserved_mem {
const char *name;
unsigned long fdt_node;
const struct reserved_mem_ops *ops;
phys_addr_t base;
phys_addr_t size;
void *priv;
};
struct reserved_mem_ops {
int (*device_init)(struct reserved_mem *rmem,
struct device *dev);
void (*device_release)(struct reserved_mem *rmem,
struct device *dev);
};
typedef int (*reservedmem_of_init_fn)(struct reserved_mem *rmem);
#ifdef CONFIG_OF_RESERVED_MEM
#define RESERVEDMEM_OF_DECLARE(name, compat, init) \
_OF_DECLARE(reservedmem, name, compat, init, reservedmem_of_init_fn)
int of_reserved_mem_device_init_by_idx(struct device *dev,
struct device_node *np, int idx);
int of_reserved_mem_device_init_by_name(struct device *dev,
struct device_node *np,
const char *name);
void of_reserved_mem_device_release(struct device *dev);
struct reserved_mem *of_reserved_mem_lookup(struct device_node *np);
int of_reserved_mem_region_to_resource(const struct device_node *np,
unsigned int idx, struct resource *res);
int of_reserved_mem_region_to_resource_byname(const struct device_node *np,
const char *name, struct resource *res);
int of_reserved_mem_region_count(const struct device_node *np);
#else
#define RESERVEDMEM_OF_DECLARE(name, compat, init) \
_OF_DECLARE_STUB(reservedmem, name, compat, init, reservedmem_of_init_fn)
static inline int of_reserved_mem_device_init_by_idx(struct device *dev,
struct device_node *np, int idx)
{
return -ENOSYS;
}
static inline int of_reserved_mem_device_init_by_name(struct device *dev,
struct device_node *np,
const char *name)
{
return -ENOSYS;
}
static inline void of_reserved_mem_device_release(struct device *pdev) { }
static inline struct reserved_mem *of_reserved_mem_lookup(struct device_node *np)
{
return NULL;
}
static inline int of_reserved_mem_region_to_resource(const struct device_node *np,
unsigned int idx,
struct resource *res)
{
return -ENOSYS;
}
static inline int of_reserved_mem_region_to_resource_byname(const struct device_node *np,
const char *name,
struct resource *res)
{
return -ENOSYS;
}
static inline int of_reserved_mem_region_count(const struct device_node *np)
{
return 0;
}
#endif
/**
* of_reserved_mem_device_init() - assign reserved memory region to given device
* @dev: Pointer to the device to configure
*
* This function assigns respective DMA-mapping operations based on the first
* reserved memory region specified by 'memory-region' property in device tree
* node of the given device.
*
* Returns error code or zero on success.
*/
static inline int of_reserved_mem_device_init(struct device *dev)
{
return of_reserved_mem_device_init_by_idx(dev, dev->of_node, 0);
}
#endif /* __OF_RESERVED_MEM_H */
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