Linux kernel mirror (for testing)
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linux
1#ifndef __OF_RESERVED_MEM_H
2#define __OF_RESERVED_MEM_H
3
4#include <linux/device.h>
5
6struct of_phandle_args;
7struct reserved_mem_ops;
8
9struct reserved_mem {
10 const char *name;
11 unsigned long fdt_node;
12 unsigned long phandle;
13 const struct reserved_mem_ops *ops;
14 phys_addr_t base;
15 phys_addr_t size;
16 void *priv;
17};
18
19struct reserved_mem_ops {
20 int (*device_init)(struct reserved_mem *rmem,
21 struct device *dev);
22 void (*device_release)(struct reserved_mem *rmem,
23 struct device *dev);
24};
25
26typedef int (*reservedmem_of_init_fn)(struct reserved_mem *rmem);
27
28#define RESERVEDMEM_OF_DECLARE(name, compat, init) \
29 _OF_DECLARE(reservedmem, name, compat, init, reservedmem_of_init_fn)
30
31#ifdef CONFIG_OF_RESERVED_MEM
32
33int of_reserved_mem_device_init_by_idx(struct device *dev,
34 struct device_node *np, int idx);
35void of_reserved_mem_device_release(struct device *dev);
36
37int early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
38 phys_addr_t align,
39 phys_addr_t start,
40 phys_addr_t end,
41 bool nomap,
42 phys_addr_t *res_base);
43
44void fdt_init_reserved_mem(void);
45void fdt_reserved_mem_save_node(unsigned long node, const char *uname,
46 phys_addr_t base, phys_addr_t size);
47#else
48static inline int of_reserved_mem_device_init_by_idx(struct device *dev,
49 struct device_node *np, int idx)
50{
51 return -ENOSYS;
52}
53static inline void of_reserved_mem_device_release(struct device *pdev) { }
54
55static inline void fdt_init_reserved_mem(void) { }
56static inline void fdt_reserved_mem_save_node(unsigned long node,
57 const char *uname, phys_addr_t base, phys_addr_t size) { }
58#endif
59
60/**
61 * of_reserved_mem_device_init() - assign reserved memory region to given device
62 * @dev: Pointer to the device to configure
63 *
64 * This function assigns respective DMA-mapping operations based on the first
65 * reserved memory region specified by 'memory-region' property in device tree
66 * node of the given device.
67 *
68 * Returns error code or zero on success.
69 */
70static inline int of_reserved_mem_device_init(struct device *dev)
71{
72 return of_reserved_mem_device_init_by_idx(dev, dev->of_node, 0);
73}
74
75#endif /* __OF_RESERVED_MEM_H */