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 #define RESERVEDMEM_OF_DECLARE(name, compat, init) \ 31 _OF_DECLARE(reservedmem, name, compat, init, reservedmem_of_init_fn) 32 33 #ifdef CONFIG_OF_RESERVED_MEM 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 void fdt_init_reserved_mem(void); 43 void fdt_reserved_mem_save_node(unsigned long node, const char *uname, 44 phys_addr_t base, phys_addr_t size); 45 struct reserved_mem *of_reserved_mem_lookup(struct device_node *np); 46 #else 47 static 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 53 static 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 60 static inline void of_reserved_mem_device_release(struct device *pdev) { } 61 62 static inline void fdt_init_reserved_mem(void) { } 63 static inline void fdt_reserved_mem_save_node(unsigned long node, 64 const char *uname, phys_addr_t base, phys_addr_t size) { } 65 static inline struct reserved_mem *of_reserved_mem_lookup(struct device_node *np) 66 { 67 return NULL; 68 } 69 #endif 70 71 /** 72 * of_reserved_mem_device_init() - assign reserved memory region to given device 73 * @dev: Pointer to the device to configure 74 * 75 * This function assigns respective DMA-mapping operations based on the first 76 * reserved memory region specified by 'memory-region' property in device tree 77 * node of the given device. 78 * 79 * Returns error code or zero on success. 80 */ 81 static inline int of_reserved_mem_device_init(struct device *dev) 82 { 83 return of_reserved_mem_device_init_by_idx(dev, dev->of_node, 0); 84 } 85 86 #endif /* __OF_RESERVED_MEM_H */ 87