1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef __OF_RESERVED_MEM_H
3*4882a593Smuzhiyun #define __OF_RESERVED_MEM_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <linux/device.h>
6*4882a593Smuzhiyun #include <linux/of.h>
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun struct of_phandle_args;
9*4882a593Smuzhiyun struct reserved_mem_ops;
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun struct reserved_mem {
12*4882a593Smuzhiyun const char *name;
13*4882a593Smuzhiyun unsigned long fdt_node;
14*4882a593Smuzhiyun unsigned long phandle;
15*4882a593Smuzhiyun const struct reserved_mem_ops *ops;
16*4882a593Smuzhiyun phys_addr_t base;
17*4882a593Smuzhiyun phys_addr_t size;
18*4882a593Smuzhiyun void *priv;
19*4882a593Smuzhiyun };
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun struct reserved_mem_ops {
22*4882a593Smuzhiyun int (*device_init)(struct reserved_mem *rmem,
23*4882a593Smuzhiyun struct device *dev);
24*4882a593Smuzhiyun void (*device_release)(struct reserved_mem *rmem,
25*4882a593Smuzhiyun struct device *dev);
26*4882a593Smuzhiyun };
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun typedef int (*reservedmem_of_init_fn)(struct reserved_mem *rmem);
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun #define RESERVEDMEM_OF_DECLARE(name, compat, init) \
31*4882a593Smuzhiyun _OF_DECLARE(reservedmem, name, compat, init, reservedmem_of_init_fn)
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun #ifdef CONFIG_OF_RESERVED_MEM
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun int of_reserved_mem_device_init_by_idx(struct device *dev,
36*4882a593Smuzhiyun struct device_node *np, int idx);
37*4882a593Smuzhiyun int of_reserved_mem_device_init_by_name(struct device *dev,
38*4882a593Smuzhiyun struct device_node *np,
39*4882a593Smuzhiyun const char *name);
40*4882a593Smuzhiyun void of_reserved_mem_device_release(struct device *dev);
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun void fdt_init_reserved_mem(void);
43*4882a593Smuzhiyun void fdt_reserved_mem_save_node(unsigned long node, const char *uname,
44*4882a593Smuzhiyun phys_addr_t base, phys_addr_t size);
45*4882a593Smuzhiyun struct reserved_mem *of_reserved_mem_lookup(struct device_node *np);
46*4882a593Smuzhiyun #else
of_reserved_mem_device_init_by_idx(struct device * dev,struct device_node * np,int idx)47*4882a593Smuzhiyun static inline int of_reserved_mem_device_init_by_idx(struct device *dev,
48*4882a593Smuzhiyun struct device_node *np, int idx)
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun return -ENOSYS;
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun
of_reserved_mem_device_init_by_name(struct device * dev,struct device_node * np,const char * name)53*4882a593Smuzhiyun static inline int of_reserved_mem_device_init_by_name(struct device *dev,
54*4882a593Smuzhiyun struct device_node *np,
55*4882a593Smuzhiyun const char *name)
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun return -ENOSYS;
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
of_reserved_mem_device_release(struct device * pdev)60*4882a593Smuzhiyun static inline void of_reserved_mem_device_release(struct device *pdev) { }
61*4882a593Smuzhiyun
fdt_init_reserved_mem(void)62*4882a593Smuzhiyun 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)63*4882a593Smuzhiyun static inline void fdt_reserved_mem_save_node(unsigned long node,
64*4882a593Smuzhiyun const char *uname, phys_addr_t base, phys_addr_t size) { }
of_reserved_mem_lookup(struct device_node * np)65*4882a593Smuzhiyun static inline struct reserved_mem *of_reserved_mem_lookup(struct device_node *np)
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun return NULL;
68*4882a593Smuzhiyun }
69*4882a593Smuzhiyun #endif
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun /**
72*4882a593Smuzhiyun * of_reserved_mem_device_init() - assign reserved memory region to given device
73*4882a593Smuzhiyun * @dev: Pointer to the device to configure
74*4882a593Smuzhiyun *
75*4882a593Smuzhiyun * This function assigns respective DMA-mapping operations based on the first
76*4882a593Smuzhiyun * reserved memory region specified by 'memory-region' property in device tree
77*4882a593Smuzhiyun * node of the given device.
78*4882a593Smuzhiyun *
79*4882a593Smuzhiyun * Returns error code or zero on success.
80*4882a593Smuzhiyun */
of_reserved_mem_device_init(struct device * dev)81*4882a593Smuzhiyun static inline int of_reserved_mem_device_init(struct device *dev)
82*4882a593Smuzhiyun {
83*4882a593Smuzhiyun return of_reserved_mem_device_init_by_idx(dev, dev->of_node, 0);
84*4882a593Smuzhiyun }
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun #endif /* __OF_RESERVED_MEM_H */
87