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
7struct of_phandle_args;
8struct reserved_mem_ops;
9
10struct reserved_mem {
11 const char *name;
12 unsigned long fdt_node;
13 unsigned long phandle;
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#define RESERVEDMEM_OF_DECLARE(name, compat, init) \
30 _OF_DECLARE(reservedmem, name, compat, init, reservedmem_of_init_fn)
31
32#ifdef CONFIG_OF_RESERVED_MEM
33
34int of_reserved_mem_device_init_by_idx(struct device *dev,
35 struct device_node *np, int idx);
36void of_reserved_mem_device_release(struct device *dev);
37
38void fdt_init_reserved_mem(void);
39void fdt_reserved_mem_save_node(unsigned long node, const char *uname,
40 phys_addr_t base, phys_addr_t size);
41struct reserved_mem *of_reserved_mem_lookup(struct device_node *np);
42#else
43static inline int of_reserved_mem_device_init_by_idx(struct device *dev,
44 struct device_node *np, int idx)
45{
46 return -ENOSYS;
47}
48static inline void of_reserved_mem_device_release(struct device *pdev) { }
49
50static inline void fdt_init_reserved_mem(void) { }
51static inline void fdt_reserved_mem_save_node(unsigned long node,
52 const char *uname, phys_addr_t base, phys_addr_t size) { }
53static inline struct reserved_mem *of_reserved_mem_lookup(struct device_node *np)
54{
55 return NULL;
56}
57#endif
58
59/**
60 * of_reserved_mem_device_init() - assign reserved memory region to given device
61 * @dev: Pointer to the device to configure
62 *
63 * This function assigns respective DMA-mapping operations based on the first
64 * reserved memory region specified by 'memory-region' property in device tree
65 * node of the given device.
66 *
67 * Returns error code or zero on success.
68 */
69static inline int of_reserved_mem_device_init(struct device *dev)
70{
71 return of_reserved_mem_device_init_by_idx(dev, dev->of_node, 0);
72}
73
74#endif /* __OF_RESERVED_MEM_H */
75