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/* SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0)
*
* Copyright 2010-2016 Freescale Semiconductor, Inc.
* Copyright 2017 NXP
*
*/
#ifndef __OF_H
#define __OF_H
#include <compat.h>
#ifndef OF_INIT_DEFAULT_PATH
#define OF_INIT_DEFAULT_PATH "/proc/device-tree"
#endif
#define OF_DEFAULT_NA 1
#define OF_DEFAULT_NS 1
#define OF_FILE_BUF_MAX 256
/**
* Layout of Device Tree:
* dt_dir
* |- dt_dir
* | |- dt_dir
* | | |- dt_dir
* | | | |- dt_file
* | | | ``- dt_file
* | | ``- dt_file
* | `-dt_file`
* ``- dt_file
*
* +------------------+
* |dt_dir |
* |+----------------+|
* ||dt_node ||
* ||+--------------+||
* |||device_node |||
* ||+--------------+||
* || list_dt_nodes ||
* |+----------------+|
* | list of subdir |
* | list of files |
* +------------------+
*/
/**
* Device description on of a device node in device tree.
*/
struct device_node {
char name[NAME_MAX];
char full_name[PATH_MAX];
};
/**
* List of device nodes available in a device tree layout
*/
struct dt_node {
struct device_node node; /**< Property of node */
int is_file; /**< FALSE==dir, TRUE==file */
struct list_head list; /**< Nodes within a parent subdir */
};
/**
* Types we use to represent directories and files
*/
struct dt_file;
struct dt_dir {
struct dt_node node;
struct list_head subdirs;
struct list_head files;
struct list_head linear;
struct dt_dir *parent;
struct dt_file *compatible;
struct dt_file *status;
struct dt_file *lphandle;
struct dt_file *a_cells;
struct dt_file *s_cells;
struct dt_file *reg;
};
struct dt_file {
struct dt_node node;
struct dt_dir *parent;
ssize_t len;
uint64_t buf[OF_FILE_BUF_MAX >> 3];
};
const struct device_node *of_find_compatible_node(
const struct device_node *from,
const char *type __always_unused,
const char *compatible)
__attribute__((nonnull(3)));
#define for_each_compatible_node(dev_node, type, compatible) \
for (dev_node = of_find_compatible_node(NULL, type, compatible); \
dev_node != NULL; \
dev_node = of_find_compatible_node(dev_node, type, compatible))
const void *of_get_property(const struct device_node *from, const char *name,
size_t *lenp) __attribute__((nonnull(2)));
bool of_device_is_available(const struct device_node *dev_node);
const struct device_node *of_find_node_by_phandle(phandle ph);
const struct device_node *of_get_parent(const struct device_node *dev_node);
const struct device_node *of_get_next_child(const struct device_node *dev_node,
const struct device_node *prev);
#define for_each_child_node(parent, child) \
for (child = of_get_next_child(parent, NULL); child != NULL; \
child = of_get_next_child(parent, child))
uint32_t of_n_addr_cells(const struct device_node *dev_node);
uint32_t of_n_size_cells(const struct device_node *dev_node);
const uint32_t *of_get_address(const struct device_node *dev_node, size_t idx,
uint64_t *size, uint32_t *flags);
uint64_t of_translate_address(const struct device_node *dev_node,
const u32 *addr) __attribute__((nonnull));
bool of_device_is_compatible(const struct device_node *dev_node,
const char *compatible);
/* of_init() must be called prior to initialisation or use of any driver
* subsystem that is device-tree-dependent. Eg. Qman/Bman, config layers, etc.
* The path should usually be "/proc/device-tree".
*/
int of_init_path(const char *dt_path);
/* of_finish() allows a controlled tear-down of the device-tree layer, eg. if a
* full reload is desired without a process exit.
*/
void of_finish(void);
/* Use of this wrapper is recommended. */
static inline int of_init(void)
{
return of_init_path(OF_INIT_DEFAULT_PATH);
}
/* Read a numeric property according to its size and return it as a 64-bit
* value.
*/
static inline uint64_t of_read_number(const __be32 *cell, int size)
{
uint64_t r = 0;
while (size--)
r = (r << 32) | be32toh(*(cell++));
return r;
}
#endif /* __OF_H */
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