1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __OF_RESERVED_MEM_H 3 #define __OF_RESERVED_MEM_H 4 5 #include <linux/device.h> 6 7 struct of_phandle_args; 8 struct reserved_mem_ops; 9 10 struct reserved_mem { 11 const char *name; 12 unsigned long fdt_node; 13 unsigned long phandle; 14 const struct reserved_mem_ops *ops; 15 phys_addr_t base; 16 phys_addr_t size; 17 void *priv; 18 }; 19 20 struct 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 27 typedef int (*reservedmem_of_init_fn)(struct reserved_mem *rmem); 28 29 #define RESERVEDMEM_OF_DECLARE(name, compat, init) \ 30 _OF_DECLARE(reservedmem, name, compat, init, reservedmem_of_init_fn) 31 32 #ifdef CONFIG_OF_RESERVED_MEM 33 34 int of_reserved_mem_device_init_by_idx(struct device *dev, 35 struct device_node *np, int idx); 36 void of_reserved_mem_device_release(struct device *dev); 37 38 void fdt_init_reserved_mem(void); 39 void fdt_reserved_mem_save_node(unsigned long node, const char *uname, 40 phys_addr_t base, phys_addr_t size); 41 struct reserved_mem *of_reserved_mem_lookup(struct device_node *np); 42 #else 43 static inline int of_reserved_mem_device_init_by_idx(struct device *dev, 44 struct device_node *np, int idx) 45 { 46 return -ENOSYS; 47 } 48 static inline void of_reserved_mem_device_release(struct device *pdev) { } 49 50 static inline void fdt_init_reserved_mem(void) { } 51 static inline void fdt_reserved_mem_save_node(unsigned long node, 52 const char *uname, phys_addr_t base, phys_addr_t size) { } 53 static inline struct reserved_mem *of_reserved_mem_lookup(struct device_node *np) 54 { 55 return NULL; 56 } 57 #endif 58 59 /** 60 * of_reserved_mem_device_init() - assign reserved memory region to given device 61 * @dev: Pointer to the device to configure 62 * 63 * This function assigns respective DMA-mapping operations based on the first 64 * reserved memory region specified by 'memory-region' property in device tree 65 * node of the given device. 66 * 67 * Returns error code or zero on success. 68 */ 69 static inline int of_reserved_mem_device_init(struct device *dev) 70 { 71 return of_reserved_mem_device_init_by_idx(dev, dev->of_node, 0); 72 } 73 74 #endif /* __OF_RESERVED_MEM_H */ 75