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