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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef __OF_RESERVED_MEM_H3#define __OF_RESERVED_MEM_H4 5#include <linux/device.h>6#include <linux/of.h>7 8struct of_phandle_args;9struct reserved_mem_ops;10 11struct reserved_mem {12 const char *name;13 unsigned long fdt_node;14 const struct reserved_mem_ops *ops;15 phys_addr_t base;16 phys_addr_t size;17 void *priv;18};19 20struct reserved_mem_ops {21 int (*device_init)(struct reserved_mem *rmem,22 struct device *dev);23 void (*device_release)(struct reserved_mem *rmem,24 struct device *dev);25};26 27typedef int (*reservedmem_of_init_fn)(struct reserved_mem *rmem);28 29#ifdef CONFIG_OF_RESERVED_MEM30 31#define RESERVEDMEM_OF_DECLARE(name, compat, init) \32 _OF_DECLARE(reservedmem, name, compat, init, reservedmem_of_init_fn)33 34int of_reserved_mem_device_init_by_idx(struct device *dev,35 struct device_node *np, int idx);36int of_reserved_mem_device_init_by_name(struct device *dev,37 struct device_node *np,38 const char *name);39void of_reserved_mem_device_release(struct device *dev);40 41struct reserved_mem *of_reserved_mem_lookup(struct device_node *np);42#else43 44#define RESERVEDMEM_OF_DECLARE(name, compat, init) \45 _OF_DECLARE_STUB(reservedmem, name, compat, init, reservedmem_of_init_fn)46 47static inline int of_reserved_mem_device_init_by_idx(struct device *dev,48 struct device_node *np, int idx)49{50 return -ENOSYS;51}52 53static inline int of_reserved_mem_device_init_by_name(struct device *dev,54 struct device_node *np,55 const char *name)56{57 return -ENOSYS;58}59 60static inline void of_reserved_mem_device_release(struct device *pdev) { }61 62static inline struct reserved_mem *of_reserved_mem_lookup(struct device_node *np)63{64 return NULL;65}66#endif67 68/**69 * of_reserved_mem_device_init() - assign reserved memory region to given device70 * @dev: Pointer to the device to configure71 *72 * This function assigns respective DMA-mapping operations based on the first73 * reserved memory region specified by 'memory-region' property in device tree74 * node of the given device.75 *76 * Returns error code or zero on success.77 */78static inline int of_reserved_mem_device_init(struct device *dev)79{80 return of_reserved_mem_device_init_by_idx(dev, dev->of_node, 0);81}82 83#endif /* __OF_RESERVED_MEM_H */84