drivers/of/of_private.h

   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  */
  25 struct 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
  41 extern struct mutex of_mutex;
  42 extern raw_spinlock_t devtree_lock;
  43 extern struct list_head aliases_lookup;
  44 extern struct kset *of_kset;
  45
  46 struct kunit;
  47 extern void of_root_kunit_skip(struct kunit *test);
  48
  49 #if defined(CONFIG_OF_DYNAMIC)
  50 extern int of_property_notify(int action, struct device_node *np,
  51                               struct property *prop, struct property *old_prop);
  52 extern void of_node_release(struct kobject *kobj);
  53 extern int __of_changeset_apply_entries(struct of_changeset *ocs,
  54                                         int *ret_revert);
  55 extern int __of_changeset_apply_notify(struct of_changeset *ocs);
  56 extern int __of_changeset_revert_entries(struct of_changeset *ocs,
  57                                          int *ret_apply);
  58 extern int __of_changeset_revert_notify(struct of_changeset *ocs);
  59 #else /* CONFIG_OF_DYNAMIC */
  60 static 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)
  68 void of_platform_register_reconfig_notifier(void);
  69 #else
  70 static inline void of_platform_register_reconfig_notifier(void) { }
  71 #endif
  72
  73 #if defined(CONFIG_OF_KOBJ)
  74 int of_node_is_attached(const struct device_node *node);
  75 int __of_add_property_sysfs(struct device_node *np, struct property *pp);
  76 void __of_remove_property_sysfs(struct device_node *np, const struct property *prop);
  77 void __of_update_property_sysfs(struct device_node *np, struct property *newprop,
  78                 const struct property *oldprop);
  79 int __of_attach_node_sysfs(struct device_node *np);
  80 void __of_detach_node_sysfs(struct device_node *np);
  81 #else
  82 static inline int __of_add_property_sysfs(struct device_node *np, struct property *pp)
  83 {
  84         return 0;
  85 }
  86 static inline void __of_remove_property_sysfs(struct device_node *np, const struct property *prop) {}
  87 static inline void __of_update_property_sysfs(struct device_node *np,
  88                 struct property *newprop, const struct property *oldprop) {}
  89 static inline int __of_attach_node_sysfs(struct device_node *np)
  90 {
  91         return 0;
  92 }
  93 static inline void __of_detach_node_sysfs(struct device_node *np) {}
  94 #endif
  95
  96 #if defined(CONFIG_OF_RESOLVE)
  97 int of_resolve_phandles(struct device_node *tree);
  98 #endif
  99
 100 void __of_phandle_cache_inv_entry(phandle handle);
 101
 102 #if defined(CONFIG_OF_OVERLAY)
 103 void of_overlay_mutex_lock(void);
 104 void of_overlay_mutex_unlock(void);
 105 #else
 106 static inline void of_overlay_mutex_lock(void) {};
 107 static inline void of_overlay_mutex_unlock(void) {};
 108 #endif
 109
 110 #if defined(CONFIG_OF_UNITTEST) && defined(CONFIG_OF_OVERLAY)
 111 extern void __init unittest_unflatten_overlay_base(void);
 112 #else
 113 static inline void unittest_unflatten_overlay_base(void) {};
 114 #endif
 115
 116 extern 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
 122 /**
 123  * General utilities for working with live trees.
 124  *
 125  * All functions with two leading underscores operate
 126  * without taking node references, so you either have to
 127  * own the devtree lock or work on detached trees only.
 128  */
 129 struct property *__of_prop_dup(const struct property *prop, gfp_t allocflags);
 130 void __of_prop_free(struct property *prop);
 131 struct device_node *__of_node_dup(const struct device_node *np,
 132                                   const char *full_name);
 133
 134 struct device_node *__of_find_node_by_path(const struct device_node *parent,
 135                                                 const char *path);
 136 struct device_node *__of_find_node_by_full_path(struct device_node *node,
 137                                                 const char *path);
 138
 139 extern const void *__of_get_property(const struct device_node *np,
 140                                      const char *name, int *lenp);
 141 extern int __of_add_property(struct device_node *np, struct property *prop);
 142 extern int __of_remove_property(struct device_node *np, struct property *prop);
 143 extern int __of_update_property(struct device_node *np,
 144                 struct property *newprop, struct property **oldprop);
 145
 146 extern void __of_detach_node(struct device_node *np);
 147
 148 extern void __of_sysfs_remove_bin_file(struct device_node *np,
 149                                        const struct property *prop);
 150
 151 /* illegal phandle value (set when unresolved) */
 152 #define OF_PHANDLE_ILLEGAL      0xdeadbeef
 153
 154 /* iterators for transactions, used for overlays */
 155 /* forward iterator */
 156 #define for_each_transaction_entry(_oft, _te) \
 157         list_for_each_entry(_te, &(_oft)->te_list, node)
 158
 159 /* reverse iterator */
 160 #define for_each_transaction_entry_reverse(_oft, _te) \
 161         list_for_each_entry_reverse(_te, &(_oft)->te_list, node)
 162
 163 extern int of_bus_n_addr_cells(struct device_node *np);
 164 extern int of_bus_n_size_cells(struct device_node *np);
 165
 166 const __be32 *of_irq_parse_imap_parent(const __be32 *imap, int len,
 167                                        struct of_phandle_args *out_irq);
 168
 169 struct bus_dma_region;
 170 #if defined(CONFIG_OF_ADDRESS) && defined(CONFIG_HAS_DMA)
 171 int of_dma_get_range(struct device_node *np,
 172                 const struct bus_dma_region **map);
 173 struct device_node *__of_get_dma_parent(const struct device_node *np);
 174 #else
 175 static inline int of_dma_get_range(struct device_node *np,
 176                 const struct bus_dma_region **map)
 177 {
 178         return -ENODEV;
 179 }
 180 static inline struct device_node *__of_get_dma_parent(const struct device_node *np)
 181 {
 182         return of_get_parent(np);
 183 }
 184 #endif
 185
 186 int fdt_scan_reserved_mem(void);
 187 void __init fdt_scan_reserved_mem_reg_nodes(void);
 188
 189 bool of_fdt_device_is_available(const void *blob, unsigned long node);
 190
 191 #endif /* _LINUX_OF_PRIVATE_H */