Linux kernel mirror (for testing)
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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 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
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#define RESERVEDMEM_OF_DECLARE(name, compat, init) \
31 _OF_DECLARE(reservedmem, name, compat, init, reservedmem_of_init_fn)
32
33#ifdef CONFIG_OF_RESERVED_MEM
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
42void fdt_init_reserved_mem(void);
43void fdt_reserved_mem_save_node(unsigned long node, const char *uname,
44 phys_addr_t base, phys_addr_t size);
45struct reserved_mem *of_reserved_mem_lookup(struct device_node *np);
46#else
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 void fdt_init_reserved_mem(void) { }
63static inline void fdt_reserved_mem_save_node(unsigned long node,
64 const char *uname, phys_addr_t base, phys_addr_t size) { }
65static inline struct reserved_mem *of_reserved_mem_lookup(struct device_node *np)
66{
67 return NULL;
68}
69#endif
70
71/**
72 * of_reserved_mem_device_init() - assign reserved memory region to given device
73 * @dev: Pointer to the device to configure
74 *
75 * This function assigns respective DMA-mapping operations based on the first
76 * reserved memory region specified by 'memory-region' property in device tree
77 * node of the given device.
78 *
79 * Returns error code or zero on success.
80 */
81static inline int of_reserved_mem_device_init(struct device *dev)
82{
83 return of_reserved_mem_device_init_by_idx(dev, dev->of_node, 0);
84}
85
86#endif /* __OF_RESERVED_MEM_H */