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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 */ |