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
7 struct of_phandle_args;
8 struct reserved_mem_ops;
9
10 struct 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
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 #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
34 int of_reserved_mem_device_init_by_idx(struct device *dev,
35 struct device_node *np, int idx);
36 void of_reserved_mem_device_release(struct device *dev);
37
38 int early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
39 phys_addr_t align,
40 phys_addr_t start,
41 phys_addr_t end,
42 bool nomap,
43 phys_addr_t *res_base);
44
45 void fdt_init_reserved_mem(void);
46 void fdt_reserved_mem_save_node(unsigned long node, const char *uname,
47 phys_addr_t base, phys_addr_t size);
48 #else
of_reserved_mem_device_init_by_idx(struct device * dev,struct device_node * np,int idx)49 static inline int of_reserved_mem_device_init_by_idx(struct device *dev,
50 struct device_node *np, int idx)
51 {
52 return -ENOSYS;
53 }
of_reserved_mem_device_release(struct device * pdev)54 static inline void of_reserved_mem_device_release(struct device *pdev) { }
55
fdt_init_reserved_mem(void)56 static inline void fdt_init_reserved_mem(void) { }
fdt_reserved_mem_save_node(unsigned long node,const char * uname,phys_addr_t base,phys_addr_t size)57 static inline void fdt_reserved_mem_save_node(unsigned long node,
58 const char *uname, phys_addr_t base, phys_addr_t size) { }
59 #endif
60
61 /**
62 * of_reserved_mem_device_init() - assign reserved memory region to given device
63 * @dev: Pointer to the device to configure
64 *
65 * This function assigns respective DMA-mapping operations based on the first
66 * reserved memory region specified by 'memory-region' property in device tree
67 * node of the given device.
68 *
69 * Returns error code or zero on success.
70 */
of_reserved_mem_device_init(struct device * dev)71 static inline int of_reserved_mem_device_init(struct device *dev)
72 {
73 return of_reserved_mem_device_init_by_idx(dev, dev->of_node, 0);
74 }
75
76 #endif /* __OF_RESERVED_MEM_H */
77