ceph/src/spdk/dpdk/drivers/bus/dpaa/include/of.h

   1 /* SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0)
   2  *
   3  * Copyright 2010-2016 Freescale Semiconductor, Inc.
   4  * Copyright 2017 NXP
   5  *
   6  */
   7
   8 #ifndef __OF_H
   9 #define __OF_H
  10
  11 #include <compat.h>
  12
  13 #ifndef OF_INIT_DEFAULT_PATH
  14 #define OF_INIT_DEFAULT_PATH "/proc/device-tree"
  15 #endif
  16
  17 #define OF_DEFAULT_NA 1
  18 #define OF_DEFAULT_NS 1
  19
  20 #define OF_FILE_BUF_MAX 256
  21
  22 /**
  23  * Layout of Device Tree:
  24  * dt_dir
  25  *  |- dt_dir
  26  *  |   |- dt_dir
  27  *  |   |  |- dt_dir
  28  *  |   |  |  |- dt_file
  29  *  |   |  |  ``- dt_file
  30  *  |   |  ``- dt_file
  31  *  |   `-dt_file`
  32  *  ``- dt_file
  33  *
  34  *  +------------------+
  35  *  |dt_dir            |
  36  *  |+----------------+|
  37  *  ||dt_node         ||
  38  *  ||+--------------+||
  39  *  |||device_node   |||
  40  *  ||+--------------+||
  41  *  || list_dt_nodes  ||
  42  *  |+----------------+|
  43  *  | list of subdir   |
  44  *  | list of files    |
  45  *  +------------------+
  46  */
  47
  48 /**
  49  * Device description on of a device node in device tree.
  50  */
  51 struct device_node {
  52         char name[NAME_MAX];
  53         char full_name[PATH_MAX];
  54 };
  55
  56 /**
  57  * List of device nodes available in a device tree layout
  58  */
  59 struct dt_node {
  60         struct device_node node; /**< Property of node */
  61         int is_file; /**< FALSE==dir, TRUE==file */
  62         struct list_head list; /**< Nodes within a parent subdir */
  63 };
  64
  65 /**
  66  * Types we use to represent directories and files
  67  */
  68 struct dt_file;
  69 struct dt_dir {
  70         struct dt_node node;
  71         struct list_head subdirs;
  72         struct list_head files;
  73         struct list_head linear;
  74         struct dt_dir *parent;
  75         struct dt_file *compatible;
  76         struct dt_file *status;
  77         struct dt_file *lphandle;
  78         struct dt_file *a_cells;
  79         struct dt_file *s_cells;
  80         struct dt_file *reg;
  81 };
  82
  83 struct dt_file {
  84         struct dt_node node;
  85         struct dt_dir *parent;
  86         ssize_t len;
  87         uint64_t buf[OF_FILE_BUF_MAX >> 3];
  88 };
  89
  90 const struct device_node *of_find_compatible_node(
  91                                         const struct device_node *from,
  92                                         const char *type __always_unused,
  93                                         const char *compatible)
  94         __attribute__((nonnull(3)));
  95
  96 #define for_each_compatible_node(dev_node, type, compatible) \
  97         for (dev_node = of_find_compatible_node(NULL, type, compatible); \
  98                 dev_node != NULL; \
  99                 dev_node = of_find_compatible_node(dev_node, type, compatible))
 100
 101 const void *of_get_property(const struct device_node *from, const char *name,
 102                             size_t *lenp) __attribute__((nonnull(2)));
 103 bool of_device_is_available(const struct device_node *dev_node);
 104
 105 const struct device_node *of_find_node_by_phandle(phandle ph);
 106
 107 const struct device_node *of_get_parent(const struct device_node *dev_node);
 108
 109 const struct device_node *of_get_next_child(const struct device_node *dev_node,
 110                                             const struct device_node *prev);
 111
 112 const void *of_get_mac_address(const struct device_node *np);
 113
 114 #define for_each_child_node(parent, child) \
 115         for (child = of_get_next_child(parent, NULL); child != NULL; \
 116                         child = of_get_next_child(parent, child))
 117
 118 uint32_t of_n_addr_cells(const struct device_node *dev_node);
 119 uint32_t of_n_size_cells(const struct device_node *dev_node);
 120
 121 const uint32_t *of_get_address(const struct device_node *dev_node, size_t idx,
 122                                uint64_t *size, uint32_t *flags);
 123
 124 uint64_t of_translate_address(const struct device_node *dev_node,
 125                               const u32 *addr) __attribute__((nonnull));
 126
 127 bool of_device_is_compatible(const struct device_node *dev_node,
 128                              const char *compatible);
 129
 130 /* of_init() must be called prior to initialisation or use of any driver
 131  * subsystem that is device-tree-dependent. Eg. Qman/Bman, config layers, etc.
 132  * The path should usually be "/proc/device-tree".
 133  */
 134 int of_init_path(const char *dt_path);
 135
 136 /* of_finish() allows a controlled tear-down of the device-tree layer, eg. if a
 137  * full reload is desired without a process exit.
 138  */
 139 void of_finish(void);
 140
 141 /* Use of this wrapper is recommended. */
 142 static inline int of_init(void)
 143 {
 144         return of_init_path(OF_INIT_DEFAULT_PATH);
 145 }
 146
 147 /* Read a numeric property according to its size and return it as a 64-bit
 148  * value.
 149  */
 150 static inline uint64_t of_read_number(const __be32 *cell, int size)
 151 {
 152         uint64_t r = 0;
 153
 154         while (size--)
 155                 r = (r << 32) | be32toh(*(cell++));
 156         return r;
 157 }
 158
 159 #endif  /*  __OF_H */