name : of_reserved_mem.h /* 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 reserved_mem { const char *name; unsigned long fdt_node; unsigned long phandle; 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); #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; } #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 */