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 unsigned long phandle;
15 const struct reserved_mem_ops *ops;
16 phys_addr_t base;
17 phys_addr_t size;
18 void *priv;
19 };
20
21 struct 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
28 typedef 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
35 int of_reserved_mem_device_init_by_idx(struct device *dev,
36 struct device_node *np, int idx);
37 int of_reserved_mem_device_init_by_name(struct device *dev,
38 struct device_node *np,
39 const char *name);
40 void of_reserved_mem_device_release(struct device *dev);
41
42 struct reserved_mem *of_reserved_mem_lookup(struct device_node *np);
43 #else
44
45 #define RESERVEDMEM_OF_DECLARE(name, compat, init) \
46 _OF_DECLARE_STUB(reservedmem, name, compat, init, reservedmem_of_init_fn)
47
of_reserved_mem_device_init_by_idx(struct device * dev,struct device_node * np,int idx)48 static inline int of_reserved_mem_device_init_by_idx(struct device *dev,
49 struct device_node *np, int idx)
50 {
51 return -ENOSYS;
52 }
53
of_reserved_mem_device_init_by_name(struct device * dev,struct device_node * np,const char * name)54 static inline int of_reserved_mem_device_init_by_name(struct device *dev,
55 struct device_node *np,
56 const char *name)
57 {
58 return -ENOSYS;
59 }
60
of_reserved_mem_device_release(struct device * pdev)61 static inline void of_reserved_mem_device_release(struct device *pdev) { }
62
of_reserved_mem_lookup(struct device_node * np)63 static inline struct reserved_mem *of_reserved_mem_lookup(struct device_node *np)
64 {
65 return NULL;
66 }
67 #endif
68
69 /**
70 * of_reserved_mem_device_init() - assign reserved memory region to given device
71 * @dev: Pointer to the device to configure
72 *
73 * This function assigns respective DMA-mapping operations based on the first
74 * reserved memory region specified by 'memory-region' property in device tree
75 * node of the given device.
76 *
77 * Returns error code or zero on success.
78 */
of_reserved_mem_device_init(struct device * dev)79 static inline int of_reserved_mem_device_init(struct device *dev)
80 {
81 return of_reserved_mem_device_init_by_idx(dev, dev->of_node, 0);
82 }
83
84 #endif /* __OF_RESERVED_MEM_H */
85