1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3 * Copyright (c) 2017 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
5 */
6
7 #ifndef _DM_OF_H
8 #define _DM_OF_H
9
10 #include <asm/u-boot.h>
11 #include <asm/global_data.h>
12
13 /* integer value within a device tree property which references another node */
14 typedef u32 phandle;
15
16 /**
17 * struct property: Device tree property
18 *
19 * @name: Property name
20 * @length: Length of property in bytes
21 * @value: Pointer to property value
22 * @next: Pointer to next property, or NULL if none
23 */
24 struct property {
25 char *name;
26 int length;
27 void *value;
28 struct property *next;
29 };
30
31 /**
32 * struct device_node: Device tree node
33 *
34 * @name: Node name
35 * @type: Node type (value of device_type property) or "<NULL>" if none
36 * @phandle: Phandle value of this none, or 0 if none
37 * @full_name: Full path to node, e.g. "/bus@1/spi@1100"
38 * @properties: Pointer to head of list of properties, or NULL if none
39 * @parent: Pointer to parent node, or NULL if this is the root node
40 * @child: Pointer to head of child node list, or NULL if no children
41 * @sibling: Pointer to the next sibling node, or NULL if this is the last
42 */
43 struct device_node {
44 const char *name;
45 const char *type;
46 phandle phandle;
47 const char *full_name;
48
49 struct property *properties;
50 struct device_node *parent;
51 struct device_node *child;
52 struct device_node *sibling;
53 };
54
55 #define OF_MAX_PHANDLE_ARGS 16
56
57 /**
58 * struct of_phandle_args - structure to hold phandle and arguments
59 *
60 * This is used when decoding a phandle in a device tree property. Typically
61 * these look like this:
62 *
63 * wibble {
64 * phandle = <5>;
65 * };
66 *
67 * ...
68 * some-prop = <&wibble 1 2 3>
69 *
70 * Here &node is the phandle of the node 'wibble', i.e. 5. There are three
71 * arguments: 1, 2, 3.
72 *
73 * So when decoding the phandle in some-prop, np will point to wibble,
74 * args_count will be 3 and the three arguments will be in args.
75 *
76 * @np: Node that the phandle refers to
77 * @args_count: Number of arguments
78 * @args: Argument values
79 */
80 struct of_phandle_args {
81 struct device_node *np;
82 int args_count;
83 uint32_t args[OF_MAX_PHANDLE_ARGS];
84 };
85
86 DECLARE_GLOBAL_DATA_PTR;
87
88 /**
89 * of_live_active() - check if livetree is active
90 *
91 * @returns true if livetree is active, false it not
92 */
93 #ifdef CONFIG_OF_LIVE
of_live_active(void)94 static inline bool of_live_active(void)
95 {
96 return gd->of_root != NULL;
97 }
98 #else
of_live_active(void)99 static inline bool of_live_active(void)
100 {
101 return false;
102 }
103 #endif
104
105 #define OF_BAD_ADDR ((u64)-1)
106
of_node_full_name(const struct device_node * np)107 static inline const char *of_node_full_name(const struct device_node *np)
108 {
109 return np ? np->full_name : "<no-node>";
110 }
111
112 /* Default #address and #size cells */
113 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
114 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
115 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
116 #endif
117
118 /* Default string compare functions */
119 #if !defined(of_compat_cmp)
120 #define of_compat_cmp(s1, s2, l) strcasecmp((s1), (s2))
121 #define of_prop_cmp(s1, s2) strcmp((s1), (s2))
122 #define of_node_cmp(s1, s2) strcasecmp((s1), (s2))
123 #endif
124
125 /* Helper to read a big number; size is in cells (not bytes) */
of_read_number(const __be32 * cell,int size)126 static inline u64 of_read_number(const __be32 *cell, int size)
127 {
128 u64 r = 0;
129 while (size--)
130 r = (r << 32) | be32_to_cpu(*(cell++));
131 return r;
132 }
133
134 /* Like of_read_number, but we want an unsigned long result */
of_read_ulong(const __be32 * cell,int size)135 static inline unsigned long of_read_ulong(const __be32 *cell, int size)
136 {
137 /* toss away upper bits if unsigned long is smaller than u64 */
138 return of_read_number(cell, size);
139 }
140
141 #endif
142