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 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 #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
34 int of_reserved_mem_device_init_by_idx(struct device *dev,
35 struct device_node *np, int idx);
36 int of_reserved_mem_device_init_by_name(struct device *dev,
37 struct device_node *np,
38 const char *name);
39 void of_reserved_mem_device_release(struct device *dev);
40
41 struct 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
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 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 */
78 static 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 */
84
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