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 int early_init_dt_alloc_reserved_memory_arch(phys_addr_t size, 39 phys_addr_t align, 40 phys_addr_t start, 41 phys_addr_t end, 42 bool nomap, 43 phys_addr_t *res_base); 44 45 void fdt_init_reserved_mem(void); 46 void fdt_reserved_mem_save_node(unsigned long node, const char *uname, 47 phys_addr_t base, phys_addr_t size); 48 struct reserved_mem *of_reserved_mem_lookup(struct device_node *np); 49 #else 50 static inline int of_reserved_mem_device_init_by_idx(struct device *dev, 51 struct device_node *np, int idx) 52 { 53 return -ENOSYS; 54 } 55 static inline void of_reserved_mem_device_release(struct device *pdev) { } 56 57 static inline void fdt_init_reserved_mem(void) { } 58 static inline void fdt_reserved_mem_save_node(unsigned long node, 59 const char *uname, phys_addr_t base, phys_addr_t size) { } 60 static inline struct reserved_mem *of_reserved_mem_lookup(struct device_node *np) 61 { 62 return NULL; 63 } 64 #endif 65 66 /** 67 * of_reserved_mem_device_init() - assign reserved memory region to given device 68 * @dev: Pointer to the device to configure 69 * 70 * This function assigns respective DMA-mapping operations based on the first 71 * reserved memory region specified by 'memory-region' property in device tree 72 * node of the given device. 73 * 74 * Returns error code or zero on success. 75 */ 76 static inline int of_reserved_mem_device_init(struct device *dev) 77 { 78 return of_reserved_mem_device_init_by_idx(dev, dev->of_node, 0); 79 } 80 81 #endif /* __OF_RESERVED_MEM_H */ 82