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
8struct of_phandle_args;
9struct reserved_mem_ops;
10struct resource;
11
12struct reserved_mem {
13 const char *name;
14 unsigned long fdt_node;
15 const struct reserved_mem_ops *ops;
16 phys_addr_t base;
17 phys_addr_t size;
18 void *priv;
19};
20
21struct 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
28typedef 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
35int of_reserved_mem_device_init_by_idx(struct device *dev,
36 struct device_node *np, int idx);
37int of_reserved_mem_device_init_by_name(struct device *dev,
38 struct device_node *np,
39 const char *name);
40void of_reserved_mem_device_release(struct device *dev);
41
42struct reserved_mem *of_reserved_mem_lookup(struct device_node *np);
43int of_reserved_mem_region_to_resource(const struct device_node *np,
44 unsigned int idx, struct resource *res);
45int of_reserved_mem_region_to_resource_byname(const struct device_node *np,
46 const char *name, struct resource *res);
47int of_reserved_mem_region_count(const struct device_node *np);
48
49#else
50
51#define RESERVEDMEM_OF_DECLARE(name, compat, init) \
52 _OF_DECLARE_STUB(reservedmem, name, compat, init, reservedmem_of_init_fn)
53
54static inline int of_reserved_mem_device_init_by_idx(struct device *dev,
55 struct device_node *np, int idx)
56{
57 return -ENOSYS;
58}
59
60static inline int of_reserved_mem_device_init_by_name(struct device *dev,
61 struct device_node *np,
62 const char *name)
63{
64 return -ENOSYS;
65}
66
67static inline void of_reserved_mem_device_release(struct device *pdev) { }
68
69static inline struct reserved_mem *of_reserved_mem_lookup(struct device_node *np)
70{
71 return NULL;
72}
73
74static inline int of_reserved_mem_region_to_resource(const struct device_node *np,
75 unsigned int idx,
76 struct resource *res)
77{
78 return -ENOSYS;
79}
80
81static inline int of_reserved_mem_region_to_resource_byname(const struct device_node *np,
82 const char *name,
83 struct resource *res)
84{
85 return -ENOSYS;
86}
87
88static inline int of_reserved_mem_region_count(const struct device_node *np)
89{
90 return 0;
91}
92#endif
93
94/**
95 * of_reserved_mem_device_init() - assign reserved memory region to given device
96 * @dev: Pointer to the device to configure
97 *
98 * This function assigns respective DMA-mapping operations based on the first
99 * reserved memory region specified by 'memory-region' property in device tree
100 * node of the given device.
101 *
102 * Returns error code or zero on success.
103 */
104static inline int of_reserved_mem_device_init(struct device *dev)
105{
106 return of_reserved_mem_device_init_by_idx(dev, np: dev->of_node, idx: 0);
107}
108
109#endif /* __OF_RESERVED_MEM_H */
110

source code of linux/include/linux/of_reserved_mem.h