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1/* SPDX-License-Identifier: GPL-2.0+ */
2#ifndef _LINUX_OF_PRIVATE_H
3#define _LINUX_OF_PRIVATE_H
4/*
5 * Private symbols used by OF support code
6 *
7 * Paul Mackerras August 1996.
8 * Copyright (C) 1996-2005 Paul Mackerras.
9 */
10
11#define FDT_ALIGN_SIZE 8
12#define MAX_RESERVED_REGIONS 64
13
14/**
15 * struct alias_prop - Alias property in 'aliases' node
16 * @link: List node to link the structure in aliases_lookup list
17 * @alias: Alias property name
18 * @np: Pointer to device_node that the alias stands for
19 * @id: Index value from end of alias name
20 * @stem: Alias string without the index
21 *
22 * The structure represents one alias property of 'aliases' node as
23 * an entry in aliases_lookup list.
24 */
25struct alias_prop {
26 struct list_head link;
27 const char *alias;
28 struct device_node *np;
29 int id;
30 char stem[];
31};
32
33#if defined(CONFIG_SPARC)
34#define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 2
35#else
36#define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
37#endif
38
39#define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
40
41extern struct mutex of_mutex;
42extern raw_spinlock_t devtree_lock;
43extern struct list_head aliases_lookup;
44extern struct kset *of_kset;
45
46struct kunit;
47extern void of_root_kunit_skip(struct kunit *test);
48
49#if defined(CONFIG_OF_DYNAMIC)
50extern int of_property_notify(int action, struct device_node *np,
51 struct property *prop, struct property *old_prop);
52extern void of_node_release(struct kobject *kobj);
53extern int __of_changeset_apply_entries(struct of_changeset *ocs,
54 int *ret_revert);
55extern int __of_changeset_apply_notify(struct of_changeset *ocs);
56extern int __of_changeset_revert_entries(struct of_changeset *ocs,
57 int *ret_apply);
58extern int __of_changeset_revert_notify(struct of_changeset *ocs);
59#else /* CONFIG_OF_DYNAMIC */
60static inline int of_property_notify(int action, struct device_node *np,
61 struct property *prop, struct property *old_prop)
62{
63 return 0;
64}
65#endif /* CONFIG_OF_DYNAMIC */
66
67#if defined(CONFIG_OF_DYNAMIC) && defined(CONFIG_OF_ADDRESS)
68void of_platform_register_reconfig_notifier(void);
69#else
70static inline void of_platform_register_reconfig_notifier(void) { }
71#endif
72
73#if defined(CONFIG_OF_KOBJ)
74int of_node_is_attached(const struct device_node *node);
75int __of_add_property_sysfs(struct device_node *np, struct property *pp);
76void __of_remove_property_sysfs(struct device_node *np, const struct property *prop);
77void __of_update_property_sysfs(struct device_node *np, struct property *newprop,
78 const struct property *oldprop);
79int __of_attach_node_sysfs(struct device_node *np);
80void __of_detach_node_sysfs(struct device_node *np);
81#else
82static inline int __of_add_property_sysfs(struct device_node *np, struct property *pp)
83{
84 return 0;
85}
86static inline void __of_remove_property_sysfs(struct device_node *np, const struct property *prop) {}
87static inline void __of_update_property_sysfs(struct device_node *np,
88 struct property *newprop, const struct property *oldprop) {}
89static inline int __of_attach_node_sysfs(struct device_node *np)
90{
91 return 0;
92}
93static inline void __of_detach_node_sysfs(struct device_node *np) {}
94#endif
95
96#if defined(CONFIG_OF_RESOLVE)
97int of_resolve_phandles(struct device_node *tree);
98#endif
99
100void __of_phandle_cache_inv_entry(phandle handle);
101
102#if defined(CONFIG_OF_OVERLAY)
103void of_overlay_mutex_lock(void);
104void of_overlay_mutex_unlock(void);
105#else
106static inline void of_overlay_mutex_lock(void) {};
107static inline void of_overlay_mutex_unlock(void) {};
108#endif
109
110#if defined(CONFIG_OF_UNITTEST) && defined(CONFIG_OF_OVERLAY)
111extern void __init unittest_unflatten_overlay_base(void);
112#else
113static inline void unittest_unflatten_overlay_base(void) {};
114#endif
115
116extern void *__unflatten_device_tree(const void *blob,
117 struct device_node *dad,
118 struct device_node **mynodes,
119 void *(*dt_alloc)(u64 size, u64 align),
120 bool detached);
121
122void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
123
124/**
125 * General utilities for working with live trees.
126 *
127 * All functions with two leading underscores operate
128 * without taking node references, so you either have to
129 * own the devtree lock or work on detached trees only.
130 */
131struct property *__of_prop_dup(const struct property *prop, gfp_t allocflags);
132void __of_prop_free(struct property *prop);
133struct device_node *__of_node_dup(const struct device_node *np,
134 const char *full_name);
135
136struct device_node *__of_find_node_by_path(const struct device_node *parent,
137 const char *path);
138struct device_node *__of_find_node_by_full_path(struct device_node *node,
139 const char *path);
140
141extern const void *__of_get_property(const struct device_node *np,
142 const char *name, int *lenp);
143extern int __of_add_property(struct device_node *np, struct property *prop);
144extern int __of_remove_property(struct device_node *np, struct property *prop);
145extern int __of_update_property(struct device_node *np,
146 struct property *newprop, struct property **oldprop);
147
148extern void __of_detach_node(struct device_node *np);
149
150extern void __of_sysfs_remove_bin_file(struct device_node *np,
151 const struct property *prop);
152
153/* illegal phandle value (set when unresolved) */
154#define OF_PHANDLE_ILLEGAL 0xdeadbeef
155
156/* iterators for transactions, used for overlays */
157/* forward iterator */
158#define for_each_transaction_entry(_oft, _te) \
159 list_for_each_entry(_te, &(_oft)->te_list, node)
160
161/* reverse iterator */
162#define for_each_transaction_entry_reverse(_oft, _te) \
163 list_for_each_entry_reverse(_te, &(_oft)->te_list, node)
164
165extern int of_bus_n_addr_cells(struct device_node *np);
166extern int of_bus_n_size_cells(struct device_node *np);
167
168const __be32 *of_irq_parse_imap_parent(const __be32 *imap, int len,
169 struct of_phandle_args *out_irq);
170
171struct bus_dma_region;
172#if defined(CONFIG_OF_ADDRESS) && defined(CONFIG_HAS_DMA)
173int of_dma_get_range(struct device_node *np,
174 const struct bus_dma_region **map);
175struct device_node *__of_get_dma_parent(const struct device_node *np);
176#else
177static inline int of_dma_get_range(struct device_node *np,
178 const struct bus_dma_region **map)
179{
180 return -ENODEV;
181}
182static inline struct device_node *__of_get_dma_parent(const struct device_node *np)
183{
184 return of_get_parent(np);
185}
186#endif
187
188int fdt_scan_reserved_mem(void);
189void __init fdt_scan_reserved_mem_late(void);
190
191bool of_fdt_device_is_available(const void *blob, unsigned long node);
192
193/* Max address size we deal with */
194#define OF_MAX_ADDR_CELLS 4
195#define OF_CHECK_ADDR_COUNT(na) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS)
196#define OF_CHECK_COUNTS(na, ns) (OF_CHECK_ADDR_COUNT(na) && (ns) > 0)
197
198/* Debug utility */
199#ifdef DEBUG
200static void __maybe_unused of_dump_addr(const char *s, const __be32 *addr, int na)
201{
202 pr_debug("%s", s);
203 while (na--)
204 pr_cont(" %08x", be32_to_cpu(*(addr++)));
205 pr_cont("\n");
206}
207#else
208static void __maybe_unused of_dump_addr(const char *s, const __be32 *addr, int na) { }
209#endif
210
211static inline bool is_pseudo_property(const char *prop_name)
212{
213 return !of_prop_cmp(prop_name, "name") ||
214 !of_prop_cmp(prop_name, "phandle") ||
215 !of_prop_cmp(prop_name, "linux,phandle");
216}
217
218#if IS_ENABLED(CONFIG_KUNIT)
219int __of_address_resource_bounds(struct resource *r, u64 start, u64 size);
220#endif
221
222#endif /* _LINUX_OF_PRIVATE_H */