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 #include <linux/of.h> 7 8 struct of_phandle_args; 9 struct reserved_mem_ops; 10 11 struct reserved_mem { 12 const char *name; 13 unsigned long fdt_node; 14 unsigned long phandle; 15 const struct reserved_mem_ops *ops; 16 phys_addr_t base; 17 phys_addr_t size; 18 void *priv; 19 }; 20 21 struct reserved_mem_ops { 22 int (*device_init)(struct reserved_mem *rmem, 23 struct device *dev); 24 void (*device_release)(struct reserved_mem *rmem, 25 struct device *dev); 26 }; 27 28 typedef int (*reservedmem_of_init_fn)(struct reserved_mem *rmem); 29 30 #ifdef CONFIG_OF_RESERVED_MEM 31 32 #define RESERVEDMEM_OF_DECLARE(name, compat, init) \ 33 _OF_DECLARE(reservedmem, name, compat, init, reservedmem_of_init_fn) 34 35 int of_reserved_mem_device_init_by_idx(struct device *dev, 36 struct device_node *np, int idx); 37 int of_reserved_mem_device_init_by_name(struct device *dev, 38 struct device_node *np, 39 const char *name); 40 void of_reserved_mem_device_release(struct device *dev); 41 42 struct reserved_mem *of_reserved_mem_lookup(struct device_node *np); 43 #else 44 45 #define RESERVEDMEM_OF_DECLARE(name, compat, init) \ 46 _OF_DECLARE_STUB(reservedmem, name, compat, init, reservedmem_of_init_fn) 47 48 static inline int of_reserved_mem_device_init_by_idx(struct device *dev, 49 struct device_node *np, int idx) 50 { 51 return -ENOSYS; 52 } 53 54 static inline int of_reserved_mem_device_init_by_name(struct device *dev, 55 struct device_node *np, 56 const char *name) 57 { 58 return -ENOSYS; 59 } 60 61 static inline void of_reserved_mem_device_release(struct device *pdev) { } 62 63 static inline struct reserved_mem *of_reserved_mem_lookup(struct device_node *np) 64 { 65 return NULL; 66 } 67 #endif 68 69 /** 70 * of_reserved_mem_device_init() - assign reserved memory region to given device 71 * @dev: Pointer to the device to configure 72 * 73 * This function assigns respective DMA-mapping operations based on the first 74 * reserved memory region specified by 'memory-region' property in device tree 75 * node of the given device. 76 * 77 * Returns error code or zero on success. 78 */ 79 static inline int of_reserved_mem_device_init(struct device *dev) 80 { 81 return of_reserved_mem_device_init_by_idx(dev, dev->of_node, 0); 82 } 83 84 #endif /* __OF_RESERVED_MEM_H */ 85